CN111309089B - Linear voltage-stabilized power supply - Google Patents
Linear voltage-stabilized power supply Download PDFInfo
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- CN111309089B CN111309089B CN202010315544.2A CN202010315544A CN111309089B CN 111309089 B CN111309089 B CN 111309089B CN 202010315544 A CN202010315544 A CN 202010315544A CN 111309089 B CN111309089 B CN 111309089B
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Abstract
The application discloses linear voltage-stabilized power supply, including the control circuit that flow equalizes. The current-sharing control circuit comprises at least one current-sharing control unit, and each current-sharing control unit comprises a driving voltage adjusting circuit, a linear voltage stabilizing circuit and a feedback circuit. The feedback circuit is used for feeding back the current sampling resistor voltage of the linear voltage stabilizing circuit to the driving voltage adjusting circuit, and the driving voltage adjusting circuit adjusts the current of the analog control signal Vctrl input into the current-sharing control unit according to the current sampling resistor voltage value and then outputs the current to the linear voltage stabilizing circuit so as to adjust the output power of the linear voltage stabilizing circuit by adjusting the voltage of the current sampling resistor. The output power of the linear voltage stabilizing circuit of each current-sharing control unit can be respectively adjusted, so that the problem of non-current sharing of the linear voltage stabilizing power supply is solved, the stability of the linear voltage stabilizing power supply is improved, and the service life of the linear voltage stabilizing power supply is prolonged.
Description
Technical Field
The invention relates to the technical field of CMOS integrated circuit design, in particular to a linear voltage-stabilized power supply.
Background
Power MOSFETs are commonly used power devices in switching converters, and the amount of loss has a direct impact on the performance and efficiency of the switching converter. The loss of the power MOSFET is mainly composed of two parts, switching loss and conduction loss. Generally, a power MOSFET with low on-resistance, high voltage endurance, high gain, low switching loss, and low gate threshold voltage is selected. However, for devices that need to operate in a linear mode, such as active loads, the above principles are not applicable. Because if the gain of the power MOSFET is too high, it is difficult to keep the drain current constant without applying a negative feedback loop considering that the gate threshold voltage has a negative temperature coefficient, and even the power MOSFET may be permanently damaged due to thermal breakdown. The power MOSFET of a general linear voltage stabilizing circuit is driven by a control circuit through a driving circuit, and the on-resistance of a power tube is adjusted by adjusting the driving voltage of the tube, so that the voltage stabilizing output is achieved. In the prior art, 2 or more MOS tubes can be used for a linear voltage-stabilized power supply, the control voltage of the linear voltage-stabilized power supply is driven by the same drive signal, the process difference of the tubes causes the difference of the on-resistance of each tube, and the drive voltage and the current of each tube flow through the loop impedance difference when the PCB layout causes the difference of the current flowing through each MOS tube, so that the current-equalizing effect cannot be achieved, and meanwhile, the temperature rise of the MOS tubes is also caused to be different due to the inconsistency of the heat dissipation environments of the MOS tubes. If the current equalizing effect is not good, the normal use of the MOS transistor is affected under the condition that the temperature rise of a certain MOS transistor is very high and the other MOS transistor possibly does not work, so that the reliability of the MOSFET is reduced, and the service life of the linear power supply is shortened.
Disclosure of Invention
The application provides a linear constant voltage power supply, solves the technical problem who exists among the prior art.
According to a first aspect, an embodiment provides a linear voltage-stabilized power supply, which includes a current-sharing control circuit;
the current-sharing control circuit responds to an analog control signal Vctrl of the linear stabilized voltage power supply and outputs a stable voltage linearly as the output of the linear stabilized voltage power supply;
the current-sharing control circuit comprises at least one current-sharing control unit;
the current-sharing control unit responds to the analog control signal Vctrl and outputs stable voltage linearly for being used as the output of the current-sharing control circuit;
the current-sharing control unit comprises a driving voltage adjusting circuit, a linear voltage stabilizing circuit and a feedback circuit;
the linear voltage stabilizing circuit responds to the analog signal control output by the driving voltage adjusting circuit and outputs a stable voltage according to linearity;
the feedback circuit is used for feeding back the current sampling resistor voltage of the linear voltage stabilizing circuit to the driving voltage adjusting circuit;
the driving voltage adjusting circuit adjusts the current input into the analog control signal Vctrl according to the current sampling resistor voltage fed back by the feedback circuit and then outputs the adjusted current to the linear voltage stabilizing circuit, so that the current of the analog control signal Vctrl is adjusted by adjusting the voltage of the current sampling resistor, and the adjustment of the output power of the linear voltage stabilizing circuit is further realized;
the current-sharing control circuit comprises a current-sharing control circuit input end and a current-sharing control circuit output end; the input end of the current-sharing control circuit is used for inputting the analog control signal Vctrl, and the output end of the current-sharing control circuit is used as the output end of the linear stabilized voltage power supply;
the current-sharing control unit comprises a current-sharing control unit input end and a current-sharing control unit output end; the input end of the current-sharing control unit is connected with the input end of the current-sharing control circuit, and the output end of the current-sharing control unit is connected with the output end of the current-sharing control circuit;
the driving voltage adjusting circuit comprises a driving voltage adjusting circuit input end, a control signal output end and a sampling signal connecting end; the input end of the driving voltage adjusting circuit is used for being connected with the input end of the current-sharing control unit, the control signal output end is used for being connected with the linear voltage stabilizing circuit, and the sampling signal connecting end is used for being connected with the feedback circuit;
the linear voltage stabilizing circuit comprises a linear voltage stabilizing circuit input end, a linear voltage stabilizing circuit output end and a feedback circuit connecting end; the input end of the linear voltage stabilizing circuit is used for being connected with the control signal output end of the driving voltage adjusting circuit, the output end of the linear voltage stabilizing circuit is used for being connected with the output end of the current-sharing control unit, and the connecting end of the feedback circuit is used for being connected with the feedback circuit.
Further, the linear voltage stabilizing circuit comprises a power transistor Q21 and a resistor Rs; the control electrode of the power transistor Q21 is used as the input end of the linear voltage stabilizing circuit, the first electrode of the power transistor Q21 is used for the input of the power supply Vcc of the linear voltage stabilizing circuit, and the second electrode of the power transistor Q21 is used as the output end of the linear voltage stabilizing circuit and is connected with the feedback circuit connection end; one end of the resistor Rs is connected with the second pole of the power transistor Q21, and the other end of the resistor Rs is connected with a zero reference potential point GND, so that the resistor Rs is used as a current sampling resistor of the linear voltage stabilizing circuit.
Further, the power transistor Q21 includes a power field effect transistor.
Further, the driving voltage adjusting circuit includes a first operational amplifier a21, a resistor R21, a resistor R22, and a resistor R23; one end of the resistor R21 is used as the input end of the driving voltage adjusting circuit, and the other end is connected with the negative input end of the first operational amplifier A21; one end of the resistor R22 is connected with the positive input end of the first operational amplifier A21, and the other end is connected with the zero reference potential point GND; one end of the resistor R23 is connected with the negative input end of the first operational amplifier A21, and the other end is connected with the output end of the first operational amplifier A21; the negative input end of the first operational amplifier a21 is used as the sampling signal connection end of the driving voltage adjusting circuit, and the output end of the first operational amplifier a21 is used as the control signal output end of the driving voltage adjusting circuit.
Further, the feedback circuit includes a resistor 24; one end of the resistor R24 is connected with the sampling signal connecting end of the driving voltage adjusting circuit, and the other end is connected with the feedback circuit connecting end of the linear voltage stabilizing circuit.
Further, the current-sharing control unit further comprises a resistor R25 connected between the control signal output terminal of the driving voltage adjusting circuit and the input terminal of the linear voltage stabilizing circuit.
Further, the driving voltage adjusting circuit further includes a capacitor C21 connected between the negative input terminal and the output terminal of the first operational amplifier a 21.
And the current-sharing control circuit further comprises an inverting amplifying circuit, and the inverting amplifying circuit is used for inverting and amplifying the analog control signal Vctrl input into the linear voltage-stabilizing power supply and outputting the amplified analog control signal Vctrl to the input end of the current-sharing control circuit.
Further, the inverting amplification circuit includes a second operational amplifier a22, a resistor R26, a resistor R27, and a resistor R28; one end of the resistor R26 is used for inputting the analog control signal Vctrl, and the other end of the resistor R26 is connected with the negative input end of the second operational amplifier A22; one end of the resistor R27 is connected with a zero reference potential point GND, and the other end is connected with the positive input end of the second operational amplifier A22; the resistor R28 is connected in series between the negative input end and the output end of the second operational amplifier A22; the output end of the second operational amplifier A22 is used for being connected with the input end of the current sharing control circuit.
Furthermore, the current-sharing control circuit comprises a plurality of current-sharing control units, the input end of each current-sharing control unit is connected with the input end of the current-sharing control circuit, and the output end of each current-sharing control unit is connected with the output end of the current-sharing control circuit.
The linear voltage-stabilized power supply according to the above embodiment includes a current-sharing control circuit. The current-sharing control circuit comprises at least one current-sharing control unit, and each current-sharing control unit comprises a driving voltage adjusting circuit, a linear voltage stabilizing circuit and a feedback circuit. The feedback circuit is used for feeding back the current sampling resistor voltage of the linear voltage stabilizing circuit to the driving voltage adjusting circuit, and the driving voltage adjusting circuit adjusts the current of the input analog control signal Vctrl according to the current sampling resistor voltage value and then outputs the current to the linear voltage stabilizing circuit so as to adjust the output power of the linear voltage stabilizing circuit by adjusting the voltage of the current sampling resistor. The output power of the linear voltage stabilizing circuit of each current-sharing control unit can be respectively adjusted, so that the problem of non-current sharing of the linear voltage stabilizing power supply is solved, the stability of the linear voltage stabilizing power supply is improved, and the service life of the linear voltage stabilizing power supply is prolonged.
Drawings
FIG. 1 is a schematic diagram of the current sharing operation of a power MOSFET of a linear voltage regulator;
FIG. 2 is a schematic diagram of a linear regulator according to an embodiment;
FIG. 3 is a schematic diagram of the circuit connections of a linear regulated power supply in one embodiment;
fig. 4 is a schematic circuit diagram of a linear regulated power supply according to an embodiment.
Detailed Description
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.
Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.
The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).
Referring to fig. 1, a schematic diagram of a current sharing operation of a power MOSFET of a linear voltage regulator includes a power MOSFET transistor Q11, a resistor R11, a resistor Rs, and a capacitor C11. After the resistor R11 and the capacitor C11 are connected in parallel, one end of the resistor R11 is used for inputting an analog control signal Vctrl, and the other end of the resistor R11 is connected with the control electrode of the transistor Q11. A first pole of the power MOSFET transistor Q11 is used as an input terminal for the supply terminal voltage VCC, and a second pole of the power MOSFET transistor Q11 is used as an output terminal to output the voltage Vs. A resistor Rs is connected in series between the second pole of the power MOSFET transistor Q11 and the zero reference potential point GND for acting as a current sampling resistor. In the linear voltage-stabilized power supply, a plurality of MOSFET transistors Q11 are used, the control voltages of the MOSFET transistors Q11 are all driven by the same control signal Vctrl, and the process difference of each MOSFET transistor Q11 causes the on-resistance Rgs of each MOSFET transistor Q11 to be different, so that the currents flowing through each MOSFET transistor Q11 are different, current equalization cannot be realized, the temperature rise difference of each MOSFET transistor Q11 is large, the reliability of the MOSFET transistor Q11 is reduced, and the linear voltage-stabilized power supply is not suitable for large-current output.
The linear voltage-stabilized power supply in the embodiment of the application comprises a current-sharing control circuit, wherein the current-sharing control circuit comprises at least one current-sharing control unit, and each current-sharing control unit comprises a driving voltage adjusting circuit, a linear voltage stabilizing circuit and a feedback circuit. The feedback circuit is used for feeding back the current sampling resistor voltage of the linear voltage stabilizing circuit to the driving voltage adjusting circuit, and the driving voltage adjusting circuit adjusts the current of the input analog control signal Vctrl according to the current sampling resistor voltage value and then outputs the current to the linear voltage stabilizing circuit so as to adjust the output power of the linear voltage stabilizing circuit by adjusting the voltage of the current sampling resistor.
Some terms referred to in the present application will be described first.
The Transistor in the present application may be a Transistor with any structure, such as a Metal-Oxide-Semiconductor Field Effect Transistor (MOSFET), which is a Field-Effect Transistor (Field-Effect Transistor) that can be widely used in analog circuits and digital circuits. MOSFETs are classified into "N-type" and "P-type" types according to their "channel" (working carrier) polarities, and are also commonly referred to as NMOSFETs and PMOSFETs, and other types include NMOS and PMOS for short. Such as Bipolar Junction Transistors (BJTs) or Field Effect Transistors (FETs). When the transistor is a bipolar transistor, the control electrode of the transistor refers to the grid electrode of the bipolar transistor, the first electrode can be the collector or the emitter of the bipolar transistor, the corresponding second electrode can be the emitter or the collector of the bipolar transistor, and in the practical application process, the emitter and the collector can be interchanged according to the signal flow direction; when the transistor is a field effect transistor, the control electrode refers to a gate electrode of the field effect transistor, the first electrode may be a drain electrode or a source electrode of the field effect transistor, and the corresponding second electrode may be a source electrode or a drain electrode of the field effect transistor, and in an actual application process, "source electrode" and "drain electrode" may be interchanged according to a signal flow direction.
Example one
Referring to fig. 2, a schematic circuit structure of a linear voltage regulator according to an embodiment includes a linear voltage regulator 1 and a load circuit 2, where the linear voltage regulator 1 includes a current sharing control circuit 10. The current-sharing control circuit 10 outputs a stable voltage linearly in response to the analog control signal Vctrl of the linear voltage-stabilized power supply 1, so as to output the stable voltage as the output of the linear voltage-stabilized power supply 1 to the load circuit 2. The current-sharing control circuit 10 includes at least one current-sharing control unit 11, and the current-sharing control unit 11 outputs a stable voltage linearly in response to the analog control signal Vctrl for use as an output of the current-sharing control circuit 10. The current share control unit 11 includes a driving voltage adjusting circuit 111, a linear voltage stabilizing circuit 112, and a feedback circuit 113. The linear voltage stabilizing circuit 112 outputs a stabilized voltage linearly in response to the analog signal output from the driving voltage adjusting circuit 111. The feedback circuit 113 is used for feeding back the current sampling resistor voltage of the linear voltage stabilizing circuit 112 to the driving voltage adjusting circuit 111. The driving voltage adjusting circuit 111 adjusts the current of the input analog control signal Vctrl according to the current sampling resistor voltage fed back by the feedback circuit 113, and outputs the adjusted current to the linear voltage stabilizing circuit 112, so as to adjust the current of the analog control signal Vctrl by adjusting the voltage of the current sampling resistor, and further adjust the output power of the linear voltage stabilizing circuit 112. The current-sharing control circuit comprises a current-sharing control circuit input end and a current-sharing control circuit output end, wherein the current-sharing control circuit input end is used for inputting an analog control signal Vctrl, and the current-sharing control circuit output end is used as the output end of the linear stabilized voltage power supply 1. The current-sharing control unit 11 comprises a current-sharing control unit input end and a current-sharing control unit output end, the current-sharing control unit input end is connected with the current-sharing control circuit input end, and the current-sharing control unit output end is connected with the current-sharing control circuit output end. The driving voltage adjusting circuit 111 includes a driving voltage adjusting circuit input terminal, a control signal output terminal and a sampling signal connection terminal, the driving voltage adjusting circuit input terminal is used for connecting with the input terminal of the current-sharing control unit, the control signal output terminal is used for connecting with the linear voltage stabilizing circuit 112, and the sampling signal connection terminal is used for connecting with the feedback circuit 113. The linear voltage stabilizing circuit 112 comprises a linear voltage stabilizing circuit input end, a linear voltage stabilizing circuit output end and a feedback circuit connecting end, wherein the linear voltage stabilizing circuit input end is used for being connected with a control signal output end of the driving voltage adjusting circuit 111, the linear voltage stabilizing circuit output end is used for being connected with a current-sharing control unit output end, and the feedback circuit connecting end is used for being connected with the feedback circuit 113.
Referring to fig. 3, a circuit connection diagram of a linear regulator in an embodiment is shown, in which the linear regulator 112 includes a power transistor Q21 and a resistor Rs, a control electrode of the power transistor Q21 is used as an input terminal of the linear regulator, a first electrode of the power transistor Q21 is used as an input terminal of a power supply Vcc of the linear regulator, and a second electrode of the power transistor Q21 is used as an output terminal of the linear regulator and is connected to the connection terminal of the feedback circuit 113. One end of the resistor Rs is connected to the second pole of the power transistor Q21, and the other end is connected to the zero reference potential point GND for acting as a current sampling resistor of the linear voltage regulating circuit 112. In one embodiment, the power transistor Q21 comprises a power field effect transistor.
The driving voltage adjusting circuit 111 includes a first operational amplifier a21, a resistor R21, a resistor R22, and a resistor R23. One end of the resistor R21 is used as the input end of the driving voltage adjusting circuit, and the other end is connected with the negative input end of the first operational amplifier A21. The resistor R22 has one end connected to the positive input terminal of the first operational amplifier a21 and the other end connected to the zero reference potential point GND. The resistor R23 has one end connected to the negative input terminal of the first operational amplifier a21 and the other end connected to the output terminal of the first operational amplifier a 21. The negative input terminal of the first operational amplifier a21 is used as the sampling signal connection terminal of the driving voltage adjusting circuit 111, and the output terminal of the first operational amplifier a21 is used as the control signal output terminal of the driving voltage adjusting circuit 111.
The feedback circuit 113 includes a resistor 24, and one end of the resistor R24 is connected to the sampling signal connection terminal of the driving voltage adjusting circuit 111, and the other end is connected to the feedback circuit connection terminal of the linear voltage stabilizing circuit 112.
In one embodiment, the current sharing control unit 11 further includes a resistor R25 connected between the control signal output terminal of the driving voltage adjusting circuit 111 and the input terminal of the linear voltage regulating circuit 112.
In one embodiment, the driving voltage adjusting circuit further includes a capacitor C21 connected between the negative input terminal and the output terminal of the first operational amplifier a 21.
In one embodiment, the linear voltage-stabilized power supply further includes an inverting amplifier circuit 20, configured to inversely amplify the analog control signal Vctrl input to the linear voltage-stabilized power supply and output the amplified analog control signal Vctrl to the current-sharing control circuit input terminal of the current-sharing control circuit 10. The inverting amplifier circuit 20 includes a second operational amplifier a22, a resistor R26, a resistor R27, and a resistor R28. One end of the resistor R26 is used for inputting the analog control signal Vctrl, and the other end is connected with the negative input end of the second operational amplifier A22. The resistor R27 has one end connected to the zero reference potential point GND and the other end connected to the positive input terminal of the second operational amplifier a 22. The resistor R28 is connected in series between the negative input end and the output end of the second operational amplifier A22, and the output end of the second operational amplifier A22 is used for being connected with the input end of the current-sharing control circuit.
As shown in fig. 3, Rgs is a resistance between the gate and the source of the power transistor Q21, the analog circuit of the linear voltage-stabilized power supply generates a control signal Vctrl for controlling the power transistor Q21, the Vctrl signal is inverted by the inverting amplifier circuit and then is connected to each current-sharing control unit of the current-sharing control circuit, the Vctrl signal is amplified by the operational amplifier a21 to generate a driving voltage Vg for directly controlling the power transistor Q21, and the control signal is adjusted by the voltage at both ends of the current sampling resistor Rs. Where Vo = I Rs, I is the current flowing through the power transistor Q21. From fig. 3, the following formula can be derived:
-Vc/R21=Vo/R23+Vs/R24
when the current flowing through the power transistor Q21 of a certain current-sharing control unit becomes large, Vs increases, and when Vc does not change, Vo decreases to reduce the conduction degree of the power transistor Q21, and then the current flowing through the power transistor Q21 decreases, so that a dynamic and stable process is formed, the current of the power transistor Q21 of each current-sharing control unit is basically consistent, and a current-sharing effect is achieved. In addition, the current size ratio of the power transistor Q21 of each current sharing control unit can be adjusted by adjusting the size ratio of the current sampling resistor Rs, so as to adapt to the situations with different heat dissipation effects.
Referring to fig. 4, a schematic circuit diagram of a linear regulated power supply in an embodiment is shown, in which a current-sharing control circuit 10 includes a plurality of current-sharing control units 11, an input terminal of each current-sharing control unit 11 is connected to an input terminal of the current-sharing control circuit, and an output terminal of each current-sharing control unit 11 is connected to an output terminal of the current-sharing control circuit.
In the embodiment of the application, a linear voltage-stabilized power supply is disclosed, which comprises a current-sharing control circuit. The current-sharing control circuit comprises at least one current-sharing control unit, and each current-sharing control unit comprises a driving voltage adjusting circuit, a linear voltage stabilizing circuit and a feedback circuit. The feedback circuit is used for feeding back the current sampling resistor voltage of the linear voltage stabilizing circuit to the driving voltage adjusting circuit, and the driving voltage adjusting circuit adjusts the current of the input analog control signal Vctrl according to the current sampling resistor voltage value and then outputs the current to the linear voltage stabilizing circuit so as to adjust the output power of the linear voltage stabilizing circuit by adjusting the voltage of the current sampling resistor. Namely, the voltage at two ends of the MOSFET current sampling resistor Rs in the linear voltage stabilizing circuit is subjected to feedback amplification so as to adjust the driving voltage of the MOSFETs and enable the current flowing through each MOSFET to be consistent in magnitude. And the analog control signal Vctrl is amplified in an inverted phase, so that the interference is reduced, and the overlarge ripple of the output voltage Vs is prevented. The current sampling resistor Rs can be adjusted proportionally to realize the proportional distribution of the current flowing through each MOSFET. The output power of the linear voltage stabilizing circuit of each current-sharing control unit can be respectively adjusted, so that the problem of non-current sharing of the linear voltage stabilizing power supply is solved, the stability of the linear voltage stabilizing power supply is improved, and the service life of the linear voltage stabilizing power supply is prolonged.
The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.
Claims (10)
1. A linear voltage-stabilized power supply is characterized by comprising a current-sharing control circuit;
the current-sharing control circuit responds to an analog control signal Vctrl of the linear stabilized voltage power supply and outputs a stable voltage linearly as the output of the linear stabilized voltage power supply;
the current-sharing control circuit comprises at least one current-sharing control unit;
the current-sharing control unit responds to the analog control signal Vctrl and outputs stable voltage linearly for being used as the output of the current-sharing control circuit;
the current-sharing control unit comprises a driving voltage adjusting circuit, a linear voltage stabilizing circuit and a feedback circuit;
the linear voltage stabilizing circuit responds to the analog signal control output by the driving voltage adjusting circuit and outputs a stable voltage according to linearity;
the feedback circuit is used for feeding back the current sampling resistor voltage of the linear voltage stabilizing circuit to the driving voltage adjusting circuit;
the driving voltage adjusting circuit adjusts the current input into the analog control signal Vctrl according to the current sampling resistor voltage fed back by the feedback circuit and then outputs the adjusted current to the linear voltage stabilizing circuit, so that the current of the analog control signal Vctrl is adjusted by adjusting the voltage of the current sampling resistor, and the adjustment of the output power of the linear voltage stabilizing circuit is further realized;
the current-sharing control circuit comprises a current-sharing control circuit input end and a current-sharing control circuit output end; the input end of the current-sharing control circuit is used for inputting the analog control signal Vctrl, and the output end of the current-sharing control circuit is used as the output end of the linear stabilized voltage power supply;
the current-sharing control unit comprises a current-sharing control unit input end and a current-sharing control unit output end; the input end of the current-sharing control unit is connected with the input end of the current-sharing control circuit, and the output end of the current-sharing control unit is connected with the output end of the current-sharing control circuit;
the driving voltage adjusting circuit comprises a driving voltage adjusting circuit input end, a control signal output end and a sampling signal connecting end; the input end of the driving voltage adjusting circuit is used for being connected with the input end of the current-sharing control unit, the control signal output end is used for being connected with the linear voltage stabilizing circuit, and the sampling signal connecting end is used for being connected with the feedback circuit;
the linear voltage stabilizing circuit comprises a linear voltage stabilizing circuit input end, a linear voltage stabilizing circuit output end and a feedback circuit connecting end; the input end of the linear voltage stabilizing circuit is used for being connected with the control signal output end of the driving voltage adjusting circuit, the output end of the linear voltage stabilizing circuit is used for being connected with the output end of the current-sharing control unit, and the connecting end of the feedback circuit is used for being connected with the feedback circuit.
2. The linear regulated power supply of claim 1, wherein said linear regulation circuit includes a power transistor Q21 and a resistor Rs; the control electrode of the power transistor Q21 is used as the input end of the linear voltage stabilizing circuit, the first electrode of the power transistor Q21 is used for the input of the power supply Vcc of the linear voltage stabilizing circuit, and the second electrode of the power transistor Q21 is used as the output end of the linear voltage stabilizing circuit and is connected with the feedback circuit connection end; one end of the resistor Rs is connected with the second pole of the power transistor Q21, and the other end of the resistor Rs is connected with a zero reference potential point GND, so that the resistor Rs is used as a current sampling resistor of the linear voltage stabilizing circuit.
3. The linear regulated power supply of claim 2, wherein said power transistor Q21 comprises a power field effect transistor.
4. The linear regulated power supply of claim 2 wherein the drive voltage adjustment circuit comprises a first operational amplifier a21, a resistor R21, a resistor R22, and a resistor R23; one end of the resistor R21 is used as the input end of the driving voltage adjusting circuit, and the other end is connected with the negative input end of the first operational amplifier A21; one end of the resistor R22 is connected with the positive input end of the first operational amplifier A21, and the other end is connected with the zero reference potential point GND; one end of the resistor R23 is connected with the negative input end of the first operational amplifier A21, and the other end is connected with the output end of the first operational amplifier A21; the negative input end of the first operational amplifier a21 is used as the sampling signal connection end of the driving voltage adjusting circuit, and the output end of the first operational amplifier a21 is used as the control signal output end of the driving voltage adjusting circuit.
5. The linear regulated power supply of claim 4 wherein said feedback circuit comprises a resistor R24; one end of the resistor R24 is connected with the sampling signal connecting end of the driving voltage adjusting circuit, and the other end is connected with the feedback circuit connecting end of the linear voltage stabilizing circuit.
6. The linear regulated power supply of claim 4 wherein the current share control unit further comprises a resistor R25 coupled between the control signal output of the drive voltage regulation circuit and the input of the linear voltage regulator circuit.
7. The linear regulated power supply of claim 4 wherein said drive voltage adjustment circuit further comprises a capacitor C21 connected between the negative input terminal and the output terminal of said first operational amplifier A21.
8. The linear voltage-stabilized power supply of claim 2, further comprising an inverting amplifier circuit for inverting-amplifying the analog control signal Vctrl input to the linear voltage-stabilized power supply and outputting the inverted analog control signal Vctrl to the input terminal of the current-sharing control circuit.
9. The linear regulated power supply of claim 8 wherein the inverting amplifier circuit comprises a second operational amplifier a22, a resistor R26, a resistor R27, and a resistor R28; one end of the resistor R26 is used for inputting the analog control signal Vctrl, and the other end of the resistor R26 is connected with the negative input end of the second operational amplifier A22; one end of the resistor R27 is connected with a zero reference potential point GND, and the other end is connected with the positive input end of the second operational amplifier A22; the resistor R28 is connected in series between the negative input end and the output end of the second operational amplifier A22; the output end of the second operational amplifier A22 is used for being connected with the input end of the current sharing control circuit.
10. The linear regulated power supply of claim 2, wherein the current sharing control circuit comprises a plurality of current sharing control units, wherein an input of each current sharing control unit is connected to an input of the current sharing control circuit, and wherein an output of each current sharing control unit is connected to an output of the current sharing control circuit.
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| CN113285592B (en) * | 2021-07-22 | 2021-10-29 | 七四九(南京)电子研究院有限公司 | Current-sharing control circuit applied to primary side of module power supply |
| CN116865559B (en) * | 2023-09-05 | 2023-12-15 | 长春吉大正元信息技术股份有限公司 | Dual-power-supply input power equalization circuit and method |
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