CN104600993B - Switch the system and method generated with voltage for source electrode - Google Patents

Abstract

Systems and methods for source switching and voltage generation are disclosed. Systems and methods for regulating a power conversion system. An example system controller for regulating a power conversion system includes a first controller terminal associated with a first controller voltage and coupled to a first transistor terminal of a first transistor, the first transistor further comprising a second transistor terminal and a third transistor terminal, the second transistor terminal being coupled to the primary winding of the power conversion system; a second controller terminal associated with the second controller voltage and coupled to the third transistor terminal; voltage associated with the third controller terminal. The first controller voltage is equal to the sum of the first voltage difference and the third controller voltage. The second controller voltage is equal to the sum of the second voltage difference and the third controller voltage.

Description

Systems and methods for source switching and voltage generation

This application is a divisional application of an invention patent application with application number 201210564309.4 and application date of December 21, 2012, entitled "System and Method for Source Switching and Voltage Generation".

technical field

The present invention relates to integrated circuits. More specifically, the present invention provides systems and methods for source switching and/or internal voltage generation. Merely by way of example, the invention has been applied to power conversion systems. It will be appreciated, however, that the invention has a much broader range of applicability.

Background technique

Conventional switch-mode power supplies often use high-voltage power MOSFETs for gated switching. However, high voltage start-up circuits for such switched mode power supplies are typically fabricated using expensive high voltage semiconductor processes. Additionally, conventional switch-mode power supplies often suffer from slow start-up and high standby power consumption.

Therefore, it is very important to improve the switching scheme of the power conversion system.

Contents of the invention

The present invention relates to integrated circuits. More specifically, the present invention provides systems and methods for source switching and/or internal voltage generation. Merely by way of example, the invention has been applied to power conversion systems. It will be appreciated, however, that the invention has a much broader range of applicability.

According to one embodiment, a system controller for regulating a power conversion system includes a first controller terminal associated with a first controller voltage and coupled to a first transistor of the first transistor terminal, the first transistor further includes a second transistor terminal and a third transistor terminal, the second transistor terminal being coupled to the primary winding of the power conversion system; a second controller terminal, the second controller terminal being associated with a second controller voltage coupled in parallel to a third transistor terminal; and a third controller terminal associated with a third controller voltage. The first controller voltage is equal to the sum of the first voltage difference and the third controller voltage. The second controller voltage is equal to the sum of the second voltage difference and the third controller voltage. The system controller is configured to hold the first voltage difference constant and vary the second voltage difference to turn the first transistor on or off and affect the primary current flowing through the primary winding.

According to a second embodiment, a system controller for regulating a power conversion system includes a first controller terminal associated with a first controller voltage and coupled to a first a transistor terminal, the first transistor further comprising a second transistor terminal and a third transistor terminal, the second transistor terminal being coupled to the primary winding of the power conversion system; a second controller terminal connected to the second controller voltage a first capacitor terminal associated with and coupled to the third transistor terminal and the first capacitor; and a third controller terminal associated with a third controller voltage. The system controller includes: a second transistor including a fourth transistor terminal, a fifth transistor terminal, and a sixth transistor terminal, the fifth transistor terminal being coupled to the second controller terminal; and a first clamping assembly, The first clamping assembly includes a first assembly terminal and a second assembly terminal, the first assembly terminal being coupled to the first controller terminal.

According to yet another embodiment, a system controller for regulating a power conversion system includes a first controller terminal associated with a first controller voltage and coupled to a first a transistor terminal, the first transistor further comprising a second transistor terminal and a third transistor terminal, the second transistor terminal being coupled to the primary winding of the power conversion system; a second controller terminal connected to the second controller voltage associated with and coupled to a third transistor terminal, the second controller terminal is also coupled through a diode to the first capacitor terminal of the first capacitor; and a third controller terminal connected to a third controller voltage Associated. The system controller also includes a second transistor including a fourth transistor terminal, a fifth transistor terminal, and a sixth transistor terminal, the fifth transistor terminal being coupled to the second controller terminal; and a diode including an anode terminal and a cathode terminal, the cathode terminal being coupled to the first capacitor terminal, and the anode terminal being coupled to the second controller terminal. The system controller is configured to charge the first capacitor through the diode in response to the one or more current spikes.

According to yet another embodiment, a system controller for regulating a power conversion system includes a first controller terminal associated with a first controller voltage and coupled to a first a transistor terminal, the first transistor further comprising a second transistor terminal and a third transistor terminal, the second transistor terminal being coupled to the primary winding of the power conversion system; a second controller terminal connected to the second controller voltage associated with and coupled to a third transistor terminal; and a third controller terminal associated with a third controller voltage. The system controller also includes a fourth controller terminal associated with a fourth controller voltage and coupled to the first capacitor terminal of the capacitor, the capacitor further comprising a first capacitor terminal coupled to the third controller terminal. two capacitor terminals; a second transistor comprising a fourth transistor terminal, a fifth transistor terminal and a sixth transistor terminal, the fifth transistor terminal being coupled to the second controller terminal; and a switch configured to receive a control signal And comprising a first switch terminal coupled to the second controller terminal and a second switch terminal coupled to the first controller terminal. The system controller is configured to close the switch if the second transistor is on and if the fourth controller voltage is less than the first threshold.

In one embodiment, a system controller for regulating a power conversion system includes a first controller terminal associated with a first controller voltage and coupled to a first a transistor terminal, the first transistor further comprising a second transistor terminal and a third transistor terminal, the third transistor terminal being coupled to the primary winding of the power conversion system; a second transistor comprising a fourth transistor terminal, a fifth transistor terminal and a sixth transistor terminal, the fifth transistor terminal being coupled to the first resistor; and a first clamping component, being coupled to the fourth transistor terminal. The first clamping component is configured to receive a current associated with the first controller voltage, generate a reference voltage based at least on information associated with the current, and bias the fourth transistor terminal to the reference voltage to provide a current at the fifth transistor terminal Generate supply voltage.

In another embodiment, a method for regulating a power conversion system including a system controller having a first controller terminal, a second controller terminal, and a third controller terminal includes: generating a first controller voltage associated with a first controller terminal coupled to a first transistor terminal of a first transistor, the first transistor further comprising a second transistor terminal and a third transistor terminal, the second the transistor terminal is coupled to the primary winding of the power conversion system; generating a second controller voltage associated with the second controller terminal coupled to the third transistor terminal; and generating a third controller voltage associated with the third controller terminal Voltage. The method also includes processing information associated with a first controller voltage equal to the sum of the first voltage difference and the third controller voltage, a second controller voltage and a third controller voltage, the second The controller voltage is equal to the sum of the second voltage difference and the third controller voltage; the first voltage difference is held constant; and the second voltage difference is varied to turn the first transistor on or off and affect the primary current through the primary winding.

In yet another embodiment, a method for regulating a power conversion system including a system controller having a controller terminal includes generating a controller voltage associated with the controller terminal, the controller terminal is coupled to a first transistor terminal of a first transistor, the first transistor further comprising a second transistor terminal and a third transistor terminal, the third transistor terminal being coupled to a primary winding of a power conversion system; generating a current; biasing a fourth transistor terminal of the second transistor to a reference voltage based at least on information associated with the current, the second transistor further comprising a fifth transistor terminal and a sixth transistor terminal, the sixth transistor terminal being coupled to the resistor; And generating a supply voltage at the fifth transistor terminal based at least on information associated with the reference voltage.

According to another embodiment, a system controller for regulating a power conversion system includes a controller terminal associated with a controller voltage and coupled to a first transistor terminal of a first transistor, the first transistor Also included are a second transistor terminal and a third transistor terminal, the third transistor terminal being coupled to the primary winding of the power conversion system; a first resistor, the first resistor being coupled to the controller terminal; and a clamping assembly, the clamping assembly A bit component is coupled to the first resistor. The clamp assembly is configured to receive a current associated with the controller voltage from the first resistor, generate a reference voltage based at least on information associated with the current, and output the reference voltage to the voltage regulator.

According to yet another embodiment, a method for regulating a power conversion system including a system controller having a controller terminal includes generating a controller voltage associated with the controller terminal, the controller terminal coupled to a first transistor terminal of a first transistor, the first transistor further comprising a second transistor terminal and a third transistor terminal, the third transistor terminal being coupled to a primary winding of a power conversion system; generating a current associated with a controller voltage , a current flows through a resistor coupled to a terminal of the controller; a reference voltage is generated based at least on information associated with the current; and the reference voltage is output to the voltage regulator.

Numerous benefits are obtained by the present invention compared to conventional techniques. For example, some embodiments of the invention provide for source switching using internal transistors in the system controller. In another example, certain embodiments of the present invention provide systems and methods for reducing an undervoltage lockout (UVLO) threshold voltage, eg, close to an internal supply voltage. In yet another example, some embodiments of the present invention provide systems and methods for rapidly charging a capacitor during a start-up process to utilize the conduction current of a transistor to provide a supply voltage.

Depending on the embodiment, one or more benefits may be obtained. These benefits, as well as various additional objects, features and advantages of the present invention, can be fully understood with reference to the following detailed description and accompanying drawings.

Description of drawings

FIG. 1 is a simplified diagram illustrating a power conversion system with source switching and/or internal voltage generation according to an embodiment of the present invention.

FIG. 2 is a simplified diagram illustrating certain components in controller 102 that is part of power conversion system 100 in accordance with an embodiment of the present invention.

FIG. 3( a ) is a simplified diagram illustrating certain components in a controller 102 that is part of a power conversion system 100 according to another embodiment of the present invention.

FIG. 3( b ) is a simplified diagram illustrating certain components in the controller 102 that is part of the power conversion system 100 according to another embodiment of the present invention.

FIG. 4 is a simplified diagram illustrating certain components in a controller 102 that is part of a power conversion system 100 according to yet another embodiment of the present invention.

FIG. 5 is a simplified diagram illustrating certain components in the controller 102 that is part of the power conversion system 100 according to yet another embodiment of the present invention.

detailed description

The present invention relates to integrated circuits. More specifically, the present invention provides systems and methods for source switching and/or internal voltage generation. Merely by way of example, the invention has been applied to power conversion systems. It will be appreciated, however, that the invention has a much broader range of applicability.

FIG. 1 is a simplified diagram illustrating a power conversion system with source switching and/or internal voltage generation according to an embodiment of the present invention. This diagram is merely an example, which should not unduly limit the scope of the claims. Those skilled in the art will recognize many variations, substitutions and modifications.

Power conversion system 100 includes controller 102, primary winding 142, secondary winding 144, auxiliary winding 146, switch 122, capacitors 120, 128, 134, 150, 154, and 158, resistors 124, 130, 132, 136, and 152, a full-wave rectifier bridge including diodes 160, 162, 164, and 166, and diodes 126, 148 and 156. Controller 102 includes terminals 104 , 106 , 108 , 110 , 112 , 114 , 116 , and 118 . For example, system 100 provides power to one or more light emitting diodes. In another example, switch 122 is a transistor. In yet another example, the switch 122 is a field effect transistor (eg, a metal oxide semiconductor field effect transistor) that includes a terminal 174 (eg, a drain terminal), a terminal 176 (eg, a gate terminal), and a terminal 178 (eg, a gate terminal). , source terminal).

According to one embodiment, transistor 122 is turned on and off based on a difference between a voltage signal 182 at terminal 176 (eg, a gate terminal) and a voltage signal 180 at terminal 178 (eg, a source terminal). In another example, system 100 performs source switching on transistor 122 by changing voltage signal 180 at terminal 178 (eg, source terminal). In yet another example, system 100 performs source switching on transistor 122 by holding voltage signal 182 at terminal 176 constant and varying voltage signal 180 at terminal 178 (eg, source terminal). In yet another example, terminal 174 (eg, a drain terminal) of transistor 122 is directly or indirectly connected to primary winding 142, and terminal 176 (eg, a gate terminal) of transistor 122 is connected to terminal 116 (eg, , terminal GATE). In yet another example, terminal 178 (eg, source terminal) of transistor 122 is connected to terminal 118 (eg, terminal SW).

As shown in FIG. 1 , in some embodiments, a full-wave rectifier bridge including diodes 160 , 162 , 164 , and 166 processes an AC input signal from an AC supply assembly 170 and generates a voltage signal 172 . For example, voltage signal 182 increases in magnitude in response to voltage signal 172 through capacitor 120 and resistor 124 and eventually reaches a predetermined magnitude. In another example, the voltage signal 182 is fixed at the predetermined magnitude. In yet another example, the transistor 122 is turned on if the difference between the voltage signal 182 and the voltage signal 180 is greater than a threshold. In yet another example, current 184 flows through transistor 122 into terminal 118 (eg, terminal SW) and out of terminal 112 (eg, terminal VDD) to charge capacitor 128 to provide a supply voltage to controller 102 .

In another embodiment, the system 100 performs internal voltage generation for the controller 102 . For example, when controller 102 begins normal operation, charged capacitor 120 provides internal current to generate an internal supply voltage for controller 102 . In another example, the generated internal supply voltage is about 5V. In yet another example, the supply voltage signal 198 at terminal 112 (eg, terminal VDD) may be as low as the internal supply voltage.

FIG. 2 is a simplified diagram illustrating certain components in controller 102 that is part of power conversion system 100 in accordance with an embodiment of the present invention. This diagram is merely an example, which should not unduly limit the scope of the claims. Those skilled in the art will recognize many variations, substitutions and modifications. The controller 102 includes a voltage clamp 188 (eg, a Zener diode), a diode 186 , a driver assembly 190 and a switch 192 . For example, switch 192 is a transistor. In another example, switch 192 is a field effect transistor (eg, MOSFET).

As shown in FIG. 2 , driver component 190 affects a voltage signal 194 at terminal 193 of transistor 192 to turn transistor 192 on or off, according to some embodiments. For example, when transistor 192 is off, transistor 122 is off. In another example, when transistor 192 is turned on, voltage 196 at terminal 110 is approximately equal to voltage signal 180 , and transistor 122 is turned on when the difference between voltage signal 182 and voltage signal 180 is greater than a threshold. In yet another example, during the startup process, capacitor 120 is charged in response to voltage signal 172 and voltage signal 182 increases in magnitude. In some embodiments, once the voltage signal 182 reaches a predetermined magnitude, the voltage clamp 188 clamps (eg, fixes) the voltage signal 182 at a predetermined magnitude (eg, the breakdown voltage of the voltage clamp 188 ). For example, in some embodiments it has been clamped by voltage clamp 188 . For example, the characteristics of the voltage clamp 188 affect the predetermined magnitude (eg, 18V). In another example, the maximum value of voltage signal 180 is equal in magnitude to the sum of voltage signal 182 and the voltage drop across diode 186 . In yet another example, during normal operation, capacitor 120 continues to receive charge (eg, from spikes due to switching of transistor 122 and transistor 192 ) in order to keep voltage signal 182 constant or substantially constant.

FIG. 3( a ) is a simplified diagram illustrating certain components in a controller 102 that is part of a power conversion system 100 according to another embodiment of the present invention. This diagram is merely an example, which should not unduly limit the scope of the claims. Those skilled in the art will recognize many variations, substitutions and modifications. Controller 102 includes voltage clamp 202 (eg, Zener diode), diodes 204 and 212 , driver assembly 206 , switch 208 , undervoltage lockout and low dropout output (UVLO & LDO) assembly 210 , resistor 213 and switch 214 . For example, switch 208 is a transistor. In another example, switch 208 is a field effect transistor (eg, MOSFET).

As shown in FIG. 3( a ), driver component 206 affects voltage signal 216 at terminal 218 (eg, gate terminal) of transistor 208 to turn transistor 208 on or off, according to some embodiments. For example, the state (eg, on or off) of transistor 122 depends on whether transistor 208 is on or off. In another example, voltage signal 182 increases in magnitude in response to voltage signal 172 across resistor 124 and capacitor 120 during the start-up process. In some embodiments, once the voltage signal 182 reaches a predetermined magnitude, the voltage clamp 202 (e.g., a Zener diode) clamps (e.g., fixes) the voltage signal 182 at the predetermined magnitude (e.g., the voltage clamp 202 breakdown voltage). For example, the characteristics of the voltage clamp 202 affect the predetermined magnitude (eg, 18V).

In one embodiment, when the difference between voltage signal 182 and voltage signal 180 is greater than a threshold, transistor 122 begins to conduct current 174 through terminal 118 (eg, terminal SW). In another example, if switch 214 is closed (e.g., turned on) in response to signal 222 (e.g., porB) generated by UVLO & LDO assembly 210, current 172 flows through diode 212 and switch 214 to charge capacitor 128, And the magnitude of the voltage signal 224 at the terminal 112 (eg, terminal VDD) increases. In yet another example, the UVLO & LDO component 210 alters the signal 222 to open (eg, turn off) the switch 214 when the magnitude of the voltage signal 224 exceeds a first predetermined threshold voltage (eg, an upper threshold). In yet another example, if the magnitude of the voltage signal 224 falls below a second predetermined threshold voltage (e.g., a lower threshold), the UVLO & LDO component 210 modifies the signal 222 to close (e.g., turn on) the switch 214, thereby again charging the capacitor 128 charge. In yet another example, current 172 is limited by at least resistor 213 coupled between terminal 118 (eg, terminal SW) and terminal 112 (eg, terminal VDD). In another example, the maximum value of the voltage signal 180 is equal in magnitude to the sum of the voltage signal 182 and the voltage drop across the diode 204 . In yet another example, the first predetermined threshold voltage is different or the same as the second predetermined threshold voltage. Resistor 213 is omitted in some embodiments.

In another embodiment, the auxiliary winding 146 is removed and the switch 214 remains on at all times. In yet another embodiment, auxiliary winding 146 and switch 214 are removed, and diode 212 is coupled between terminal 118 and terminal 112 . For example, without auxiliary winding 146 , the supply voltage for controller 102 is provided through transistor 122 . In another example, the switch 214 is implemented using a p-channel field effect transistor (eg, a p-channel metal oxide semiconductor field effect transistor).

Fig. 3(b) is a simplified diagram illustrating certain components in the controller 102 that is part of the power conversion system 100 according to yet another embodiment of the present invention. This diagram is merely an example, which should not unduly limit the scope of the claims. Those skilled in the art will recognize many variations, substitutions and modifications. Controller 102 includes voltage clamp 202 (eg, Zener diode), diodes 204 and 212 , driver assembly 206 , transistor 208 , undervoltage lockout and low dropout output (UVLO & LDO) assembly 210 , resistor 213 and switch 214 . Additionally, the controller 102 includes a current source 230 and a diode 232 . For example, switch 208 is a field effect transistor (eg, MOSFET).

According to one embodiment, the voltage signal 182 at the terminal 176 (eg, the gate terminal of the transistor 122 ) is maintained at no less than a predetermined level. For example, diode 232 has a forward voltage (eg, V _f ). In another example, the voltage signal 224 at the terminal 112 (eg, terminal VDD) is not less than the undervoltage lockout voltage (eg, V _UVLO ) during normal operation of the power conversion system 100 . Therefore, according to some embodiments, the minimum value of the voltage signal 182 is determined as follows:

V _GATE ≥ V _UVLO –V _f (1)

Where V _GATE represents the voltage signal 182 . For example, when the magnitude of voltage signal 182 is less than voltage signal 224 minus the forward voltage of diode 232, capacitor 120 is charged in response to current 234, which flows from terminal 112 (e.g., terminal VDD) through diode 232 to terminal 116 (for example, terminal GATE).

FIG. 4 is a simplified diagram illustrating certain components in a controller 102 that is part of a power conversion system 100 according to yet another embodiment of the present invention. This diagram is merely an example, which should not unduly limit the scope of the claims. Those skilled in the art will recognize many variations, substitutions and modifications. Controller 102 includes voltage clamps 302 and 332 , diodes 304 and 312 , driver assembly 306 , switches 308 and 334 , undervoltage lockout (UVLO) assembly 310 , switch 314 , and resistors 330 and 336 . For example, switches 308 and 334 are transistors. In another example, switch 308 is a field effect transistor (eg, MOSFET). In another example, switch 334 is a field effect transistor (eg, MOSFET).

As shown in FIG. 4 , driver component 306 affects voltage signal 316 at terminal 318 (eg, gate terminal) of transistor 308 to turn transistor 308 on or off, according to some embodiments. For example, the state (eg, on or off) of transistor 122 depends on whether transistor 308 is on or off. In another example, voltage signal 182 increases in magnitude in response to voltage signal 172 across resistor 124 and capacitor 120 during the start-up process. In some embodiments, once the voltage signal 182 reaches a predetermined magnitude, the voltage clamp 302 clamps (eg, fixes) the voltage signal 182 at the predetermined magnitude (eg, the breakdown voltage of the voltage clamp 302 ).

In one embodiment, when the difference between voltage signal 182 and voltage signal 180 is greater than a threshold, transistor 122 begins to conduct current 174 through terminal 118 (eg, terminal SW). In another example, if switch 314 is closed (e.g., turned on) in response to signal 322 (e.g., porB) generated by UVLO component 310, current 172 flows through diode 312 and switch 314 to charge capacitor 128, And the magnitude of the voltage signal 324 at terminal 112 (eg, terminal VDD) increases. In yet another example, the UVLO component 310 alters the signal 322 to open (eg, turn off) the switch 314 when the magnitude of the voltage signal 324 exceeds a first predetermined threshold voltage (eg, an upper threshold). In yet another example, if the magnitude of the voltage signal 324 falls below a second predetermined threshold voltage (e.g., a lower threshold), the UVLO component 310 modifies the signal 322 to close (e.g., turn on) the switch 314, thereby again charging the capacitor 128 charge. In yet another example, the first predetermined threshold voltage is different or the same as the second predetermined threshold voltage.

In another embodiment, the charged capacitor 120 provides the current 350 which flows through the resistor 330 when the controller 102 begins normal operation. For example, a reference voltage signal 352 (eg, V _ref ) is generated in response to current 350 flowing from resistor 330 to voltage clamp 332 . In some embodiments, the reference voltage signal 352 is provided to the voltage regulator as a reference level. For example, the voltage regulator includes transistor 334 configured as a source follower. In another example, a reference voltage signal 352 (eg, V _ref ) is generated at a terminal 354 (eg, a gate terminal) of the transistor 334 . In yet another example, once the voltage signal 352 (eg, V _ref ) reaches a predetermined magnitude, the voltage clamper 332 clamps (eg, fixes) the voltage signal 352 at the predetermined magnitude (eg, the voltage clamper 332 breakdown voltage). In yet another example, if transistor 334 is turned on, a voltage signal 356 (eg, AVDD) is generated at terminal 358 of transistor 334 through resistor 336 . In yet another example, the voltage signal 356 (eg, AVDD) is used to provide the controller 102 with an internal supply voltage. In yet another example, the signal 356 (eg, AVDD) is an internal signal of the controller 102 , eg, an internal supply voltage.

V _AVDD = V _ref -V _th (2)

Wherein, V _ref represents the reference voltage signal 352 , and V _th represents the threshold voltage of the transistor 334 .

For example, the breakdown voltage of the voltage clamp 332 (eg, Zener diode) is about 6V, and the threshold voltage of the transistor 334 is about 1V. In some embodiments, voltage signal 356 is generated to be approximately 5V. For example, even though voltage signal 324 is as low as about 5V, transistor 334 can still generate voltage signal 356 at about 5V by operating in the linear region. Therefore, in some embodiments, the second predetermined threshold voltage (eg, lower threshold) of UVLO component 310 may be reduced to a low magnitude (eg, 5V).

In yet another embodiment, during normal operation, capacitor 120 is charged in response to a spike generated by diode 304 (eg, D2) each time transistor 308 (eg, M2) switches, so that voltage signal 182 remains Constant or substantially constant. For example, resistor 124 has a large resistance to reduce power loss. In another example, the spike is primarily generated when transistor 308 is off.

FIG. 5 is a simplified diagram illustrating the main components of a controller 102 that is part of a power conversion system 100 according to yet another embodiment of the present invention. This diagram is merely an example, which should not unduly limit the scope of the claims. Those skilled in the art will recognize many variations, substitutions and modifications. Controller 402 includes Zener diodes 402 , 432 and 462 , diodes 404 and 412 , driver assembly 406 , transistors 408 and 434 , undervoltage lockout (UVLO) assembly 410 , switches 414 , 464 , 466 and 468 , and resistors 430 and 436 . For example, transistor 408 is a field effect transistor (eg, MOSFET). In another example, transistor 434 is a field effect transistor (eg, MOSFET).

As shown in FIG. 5 , driver component 406 affects a voltage signal 416 at terminal 418 (eg, gate terminal) of transistor 408 to turn transistor 408 on or off, according to some embodiments. For example, the state (eg, on or off) of transistor 122 depends on whether transistor 408 is on or off. In another example, voltage signal 182 increases in magnitude in response to voltage signal 172 across resistor 124 and capacitor 120 during the start-up process. In some embodiments, voltage signal 182 is at least clamped (eg, fixed) by Zener diode 402 once it reaches a predetermined magnitude. For example, during start-up processing, the magnitude of the voltage signal 424 at terminal 112 (e.g., terminal VDD) is below a first predetermined threshold voltage (e.g., an upper threshold), and UVLO component 410 generates signal 422 (e.g., porB) to close Switches 414 and 464 are (eg, turned on) and signal 470 (eg, por) is generated to turn off (eg, turn off) switches 466 and 468 . In another example, signal 470 is logic low when signal 422 is logic high, and signal 470 is logic high when signal 422 is logic low.

In one embodiment, when the difference between voltage signal 182 and voltage signal 180 is greater than a threshold, transistor 122 begins to conduct current 174 through terminal 118 (eg, terminal SW). In another example, if switch 414 is closed (eg, turned on) in response to signal 422 (eg, porB), current 172 flows through diode 412 and switch 414 to charge capacitor 128 and terminal 112 (eg, The magnitude of the voltage signal 424 at terminal VDD) increases. In yet another example, the UVLO component 410 alters the signal 422 to open (eg, turn off) the switch 414 when the magnitude of the voltage signal 424 exceeds a first predetermined threshold voltage. In yet another example, if the magnitude of the voltage signal 424 falls below a second predetermined threshold voltage (e.g., a lower threshold), the UVLO component 410 modifies the signal 422 to close (e.g., turn on) the switch 414, thereby again charging the capacitor 128 charge. In yet another example, if the magnitude of the voltage signal 424 exceeds a first predetermined threshold voltage, the switch 466 is closed (eg, turned on) in response to the signal 470 generated by the UVLO component 410 and the voltage signal 182 is clamped by the Zener diode 402 bit (eg, fixed). In yet another example, if the magnitude of voltage signal 424 falls below a second predetermined threshold voltage, switch 466 is opened (eg, turned off) in response to signal 470 generated by UVLO component 410 and voltage signal 182 is zenered. Diode 402 and Zener diode 462 clamp (eg, hold). In yet another example, the first predetermined threshold voltage is different or the same as the second predetermined threshold voltage.

In another embodiment, when the controller 102 is operating normally, if the magnitude of the voltage signal 424 is greater than the first predetermined threshold voltage, the switch 468 is closed (e.g., turned on) in response to the signal 470 generated by the UVLO component 410, and Switch 464 is opened (eg, turned off) in response to signal 422 . In another example, charged capacitor 120 provides current 450 , which flows through resistor 430 . For example, a reference voltage signal 452 (eg, V _ref ) is generated in response to current 450 flowing from resistor 430 to voltage clamp 432 . In some embodiments, the reference voltage signal 452 is provided to the voltage regulator as a reference level. For example, the voltage regulator includes transistor 434 configured as a source follower. In another example, the reference voltage signal 452 is generated at a terminal 454 (eg, a gate terminal) of the transistor 434 . In yet another example, if transistor 434 is turned on, a voltage signal 456 (eg, AVDD) is generated at terminal 458 of transistor 434 through resistor 436 . In yet another example, the signal 456 (eg, AVDD) is an internal signal of the controller 102 , eg, an internal supply voltage.

V _AVDD = V _ref -V _th (3)

Wherein, V _ref represents the reference voltage signal 452 , and V _th represents the threshold voltage of the transistor 434 .

According to another embodiment, a system controller for regulating a power conversion system includes a first controller terminal associated with a first controller voltage and coupled to a first a transistor terminal, the first transistor further comprising a second transistor terminal and a third transistor terminal, the second transistor terminal being coupled to the primary winding of the power conversion system; a second controller terminal connected to the first Two controller voltages are associated and coupled to the third transistor terminal; and a third controller terminal is associated with the third controller voltage. The first controller voltage is equal to the sum of the first voltage difference and the third controller voltage. The second controller voltage is equal to the sum of the second voltage difference and the third controller voltage. The system controller is configured to hold the first voltage difference constant and vary the second voltage difference to turn the first transistor on or off and affect primary current through the primary winding. For example, the system controller is implemented according to FIG. 1 , FIG. 2 , FIG. 3( a ), FIG. 3( b ), FIG. 4 and/or FIG. 5 .

According to yet another embodiment, a system controller for regulating a power conversion system includes a first controller terminal associated with a first controller voltage and coupled to a first a transistor terminal, the first transistor further comprising a second transistor terminal and a third transistor terminal, the second transistor terminal being coupled to the primary winding of the power conversion system; a second controller terminal connected to the first Two controller voltages are associated and coupled to the third transistor terminal and the first capacitor terminal of the first capacitor; and a third controller terminal, the third controller terminal being associated with the third controller voltage. The system controller includes: a second transistor including a fourth transistor terminal, a fifth transistor terminal and a sixth transistor terminal, the fifth transistor terminal being coupled to the second controller terminal; and a first A clamping assembly, the first clamping assembly including a first assembly terminal and a second assembly terminal, the first assembly terminal being coupled to the first controller terminal. For example, the system controller is implemented according to at least FIG. 2 , FIG. 3( a ), FIG. 3( b ), FIG. 4 and/or FIG. 5 .

According to yet another embodiment, a system controller for regulating a power conversion system includes a first controller terminal associated with a first controller voltage and coupled to a first a transistor terminal, the first transistor further comprising a second transistor terminal and a third transistor terminal, the second transistor terminal being coupled to the primary winding of the power conversion system; a second controller terminal connected to the first Two controller voltages are associated and coupled to said third transistor terminal, said second controller terminal being also coupled via a diode to the first capacitor terminal of the first capacitor; and a third controller terminal, the third control The tor terminal is associated with a third controller voltage. The system controller also includes: a second transistor including a fourth transistor terminal, a fifth transistor terminal, and a sixth transistor terminal, the fifth transistor terminal being coupled to the second controller terminal; and the The diode includes an anode terminal coupled to the first capacitor terminal and a cathode terminal coupled to the second controller terminal. The system controller is configured to charge the first capacitor through the diode in response to one or more current spikes. For example, the system controller is implemented according to at least FIG. 2 , FIG. 3( a ), FIG. 3( b ), FIG. 4 and/or FIG. 5 .

According to yet another embodiment, a system controller for regulating a power conversion system includes a first controller terminal associated with a first controller voltage and coupled to a first a transistor terminal, the first transistor further comprising a second transistor terminal and a third transistor terminal, the second transistor terminal being coupled to the primary winding of the power conversion system; a second controller terminal connected to the first Two controller voltages are associated and coupled to the third transistor terminal; and a third controller terminal is associated with the third controller voltage. The system controller also includes a fourth controller terminal associated with a fourth controller voltage and coupled to a first capacitor terminal of a capacitor that also includes a capacitor coupled to the third control a second capacitor terminal of the controller terminal; a second transistor comprising a fourth transistor terminal, a fifth transistor terminal and a sixth transistor terminal, the fifth transistor terminal being coupled to the second controller terminal; and a switch configured to receive a control signal and comprising a first switch terminal coupled to the second controller terminal and a second switch terminal coupled to the first switch terminal Controller terminal. The system controller is configured to close the switch if the second transistor is on and if the fourth controller voltage is less than a first threshold. For example, the system controller is implemented according to at least FIG. 3( a ), FIG. 3( b ), FIG. 4 and/or FIG. 5 .

In one embodiment, a system controller for regulating a power conversion system includes a first controller terminal associated with a first controller voltage and coupled to a first a transistor terminal, the first transistor further comprising a second transistor terminal and a third transistor terminal, the third transistor terminal being coupled to the primary winding of the power conversion system; a second transistor comprising a fourth transistor terminal, A fifth transistor terminal and a sixth transistor terminal, the fifth transistor terminal being coupled to the first resistor; and a first clamping component coupled to the fourth transistor terminal. A first clamping component is configured to receive a current associated with the first controller voltage, generate a reference voltage based at least on information associated with the current, and bias the fourth transistor terminal to the reference voltage to generate a supply voltage at the fifth transistor terminal. For example, the system controller is implemented according to at least FIG. 4 and/or FIG. 5 .

In another embodiment, a method for regulating a power conversion system including a system controller having a first controller terminal, a second controller terminal, and a third controller terminal includes: generating a first controller voltage associated with the first controller terminal coupled to a first transistor terminal of a first transistor, the first transistor further comprising a second transistor terminal and a first transistor terminal three transistor terminals, the second transistor terminal being coupled to a primary winding of the power conversion system; generating a second controller voltage associated with a second controller terminal coupled to the third transistor terminal; and generating a second controller voltage associated with the second controller terminal coupled to the third transistor terminal; A third controller voltage associated with the third controller terminal. The method also includes processing information associated with the first controller voltage, the second controller voltage, and the third controller voltage, the first controller voltage being equal to a first voltage difference and the the sum of a third controller voltage, the second controller voltage being equal to the sum of a second voltage difference and the third controller voltage; keeping the first voltage difference constant; and varying the second voltage difference, to turn on or off the first transistor and affect the primary current flowing through the primary winding. For example, the method is implemented according to FIG. 1 , FIG. 2 , FIG. 3( a ), FIG. 3( b ), FIG. 4 and/or FIG. 5 .

In yet another embodiment, a method for regulating a power conversion system including a system controller having a controller terminal includes generating a controller voltage associated with the controller terminal, The controller terminal is coupled to a first transistor terminal of a first transistor, the first transistor further comprising a second transistor terminal and a third transistor terminal, the third transistor terminal being coupled to a primary of the power conversion system winding; generating a current associated with said controller voltage; biasing a fourth transistor terminal of a second transistor to a reference voltage based at least on information associated with said current, said second transistor further comprising a fifth transistor terminal and a sixth transistor terminal coupled to a resistor; and generating a supply voltage at the fifth transistor terminal based at least on information associated with the reference voltage. For example, the method is implemented at least according to FIG. 4 and/or FIG. 5 .

According to another embodiment, a system controller for regulating a power conversion system includes a controller terminal associated with a controller voltage and coupled to a first transistor terminal of a first transistor, the first a transistor further comprising a second transistor terminal and a third transistor terminal, the third transistor terminal being coupled to the primary winding of the power conversion system; a first resistor being coupled to the controller terminal and a clamping component coupled to the first resistor. a clamping assembly configured to receive a current associated with the controller voltage from the first resistor, generate a reference voltage based at least on information associated with the current, and output the reference voltage to a voltage regulator . For example, the system controller is implemented according to at least FIG. 4 and/or FIG. 5 .

According to yet another embodiment, a method for regulating a power conversion system including a system controller having a controller terminal includes generating a controller voltage associated with the controller terminal, the The controller terminal is coupled to a first transistor terminal of a first transistor, the first transistor further comprising a second transistor terminal and a third transistor terminal, the third transistor terminal being coupled to a primary winding of the power conversion system generating a current associated with the controller voltage through a resistor coupled to the controller terminal; generating a reference voltage based at least on information associated with the current; and outputting the reference voltage to the regulator. For example, the method is implemented at least according to FIG. 4 and/or FIG. 5 .

For example, some or all of the components in various embodiments of the invention utilize one or more software components, one or more hardware components, and/or a combination of software and hardware components, alone and/or in combination with at least one other component. realized by one or more combinations. In another example, some or all of the components of various embodiments of the invention are implemented in one or more circuits, such as one or more analog circuits and/or implemented in one or more digital circuits. In yet another example, various embodiments and/or examples of the invention may be combined.

While specific embodiments of the invention have been described, it will be apparent to those skilled in the art that there are other embodiments that are equivalent to the described embodiments. It will therefore be understood that the invention is not to be limited by the particular embodiments shown, but is only limited by the scope of the claims.

Claims (11)

1. a kind of system controller for being used to adjust power converting system, the system controller includes：

First controller terminal, the first controller terminal is associated with the first controller voltage and is coupled to the first transistor The first transistor terminal, the first transistor also include second transistor terminal and third transistor terminal, the described 3rd Transistor terminal is coupled to the armature winding of power converting system；

Second transistor, the second transistor includes the 4th transistor terminal, the 5th transistor terminal and the 6th transistor terminal, 5th transistor terminal is coupled to first resistor device；And

First clamper component, is coupled to the 4th transistor terminal；

Wherein, the first clamper component is configured as receiving the electric current associated with the first controller voltage, at least base Reference voltage is generated in the information associated with the electric current, and the 4th transistor terminal is biased to the reference electricity Pressure is with the generation supply voltage at the 5th transistor terminal.

2. the system as claimed in claim 1 controller, wherein, the 4th transistor terminal is coupled by second resistance device To the first controller terminal.

3. the system as claimed in claim 1 controller, in addition to：

Second controller terminal, the second controller terminal is associated with second controller voltage and is coupled to the 3rd crystalline substance Body pipe end；And

3rd controller terminal, the 3rd controller terminal is associated with the 3rd controller voltage.

4. system controller as claimed in claim 3, in addition to it is coupled to the second clamper group of the first controller terminal Part；

Wherein：

It is poor with the 3rd controller voltage sum that the second controller voltage is equal to second voltage；And

It is poor that the second transistor is configured as changing the second voltage, with the first transistor described on or off and influences Flow through the primary current of the armature winding.

5. system controller as claimed in claim 4, wherein：

It is poor with the 3rd controller voltage sum that the first controller voltage is equal to first voltage；And

The second clamper component is configured as keeping the first voltage difference to be no more than predetermined threshold.

6. the system as claimed in claim 1 controller, in addition to：

Second controller terminal, the second controller terminal is associated with second controller voltage；

3rd controller terminal, the 3rd controller terminal is associated with the 3rd controller voltage and is coupled to the first capacitor The first capacitor terminal, the capacitor also includes being coupled to the second capacitor terminal of the second controller terminal；With And

First switch, is configured as receiving the first control signal and including first switch terminal and second switch terminal, described First switch terminal is coupled to the 4th transistor terminal, and the second switch terminal is coupled to the second controller end Son；

Wherein, the system controller is configured as closing described first if the 3rd controller voltage is less than threshold value and opening Close.

7. system controller as claimed in claim 6, in addition to：

Second switch, is configured as receiving the second control signal and be configured as will be associated with the first controller voltage Electric current is conducted to the first clamper component；

Wherein, the system controller is configured as：

If the 3rd controller voltage is more than the threshold value, the second switch is closed so that first controller is electric The associated electric current of pressure is conducted to the first clamper component；And

If the 3rd controller voltage is less than the threshold value, the second switch is disconnected.

8. a kind of method for adjusting power converting system, the power converting system includes the system control with controller terminal Device processed, this method includes：

The generation controller voltage associated with the controller terminal, the controller terminal is coupled to the first transistor The first transistor terminal, the first transistor also includes second transistor terminal and third transistor terminal, and the described 3rd is brilliant Body pipe end is coupled to the armature winding of the power converting system；

The generation electric current associated with the controller voltage；

The 4th transistor terminal of second transistor is at least biased to by reference voltage based on the information associated with the electric current, The second transistor also includes the 5th transistor terminal and the 6th transistor terminal, and the 6th transistor terminal is coupled to Resistor；And

Supply voltage is at least generated at the 5th transistor terminal based on the information associated with the reference voltage.

9. a kind of system controller for being used to adjust power converting system, the system controller includes：

Controller terminal, the controller terminal is associated with controller voltage and is coupled to the first transistor of the first transistor Terminal, the first transistor also includes second transistor terminal and third transistor terminal, the third transistor terminal quilt It is coupled to the armature winding of the power converting system；

First resistor device, the first resistor device is coupled to the controller terminal；And

Clamper component, the clamper component is coupled to the first resistor device；

Wherein, the clamper component is configured as receiving the electricity associated with the controller voltage from the first resistor device Stream, at least based on associated with electric current information generation reference voltage, and by the reference voltage output to pressure regulator.

10. system controller as claimed in claim 9, wherein：

The pressure regulator includes second transistor, and the second transistor includes the 4th transistor terminal, the 5th transistor terminal With the 6th transistor terminal, the 6th transistor terminal is coupled to second resistance device；

4th transistor terminal is coupled to the clamper component；And

The clamper component is configured as the 4th transistor terminal being biased to the reference voltage with brilliant the described 5th Supply voltage is generated at body pipe end.

11. a kind of method for adjusting power converting system, the power converting system includes the system with controller terminal Controller, this method includes：

The generation controller voltage associated with the controller terminal, the controller terminal is coupled to the first transistor The first transistor terminal, the first transistor also includes second transistor terminal and third transistor terminal, and the described 3rd is brilliant Body pipe end is coupled to the armature winding of the power converting system；

The generation electric current associated with the controller voltage, the electric current flows through the resistance for being coupled to the controller terminal Device；

Reference voltage is at least generated based on the information associated with the electric current；And

By the reference voltage output to pressure regulator.