CN103313003A - Standby control circuit and television set - Google Patents

Abstract

The invention relates to the field of power supplies, and provides a standby control circuit and a television. A standby control circuit, comprising an EMI filter module, a rectification filter module, a transformer module, an output rectification filter module connected in sequence, the input terminal of the EMI filter module is connected to a power supply, the output terminal of the output rectification filter module is connected to a load, and a PWM control module; Including: voltage stabilization feedback module, energy storage module, voltage comparison module, standby signal input module, and standby control module. In the standby control circuit provided by the present invention, the PWM control module is in an intermittent working state during standby, and can automatically and intermittently charge the energy storage module instantaneously, and then the energy storage module supplies power to the load for a long time, the circuit is simple and the cost is low; Compared with the normally-on state of the PWM control module in the prior art, its power consumption is lower, and can be as low as the power consumption of only one indicator light.

Description

Standby control circuit and TV

technical field

The invention relates to the field of electrical circuits, in particular to an intermittent power supply standby low power consumption control circuit and a television set.

Background technique

With the development of society, the awareness of energy saving has been paid more and more attention by consumers. However, the power supplies of televisions, computers, air conditioners, refrigerators and other electrical equipment have high standby power consumption. According to the survey, the electricity bills due to the standby power consumption of electrical equipment are nearly 100 million yuan each year.

However, the existing "intermittent operation mode" electrical standby circuit uses relays, CPU control, super capacitors and other circuit modules, which have the disadvantages of high cost, complex circuit, difficult safety regulation, and short service life of relay switches; in addition, the use of "zero power Although the standby power consumption of the electrical circuit in standby mode is reduced to close to zero, but with the whole machine, the standby indicator light, infrared receiver and other components cannot work normally.

To sum up, the standby circuit in the prior art has disadvantages such as complex circuit, difficult control of safety regulations, high cost, or loads such as standby indicator light and infrared receiver cannot work normally.

Contents of the invention

The purpose of the present invention is to provide a standby control circuit, which aims to solve the disadvantages of the prior art standby circuit such as complex circuit, difficult safety control, high cost, or loads such as standby indicator light and infrared receiver cannot work normally.

For this reason, the present invention adopts following technical scheme:

A standby control circuit, comprising an EMI filter module, a rectifier filter module, a transformer module, and an output rectifier filter module connected in sequence, the input terminal of the EMI filter module is connected to a power supply, and the output terminal of the output rectifier filter module is connected to a load; It includes a PWM control module that controls the working state of the transformer module, the power-on terminal of the PWM control module is connected to the output terminal of the EMI filter module, and the switch signal output terminal is connected to the controlled terminal and power input terminal of the transformer module connected to the second power output terminal of the transformer module;

The standby control circuit also includes:

Feedback the voltage of the direct current output by the output rectification and filtering module to the PWM control module and the voltage stabilization feedback module that outputs a voltage stabilization signal, the input terminal of the voltage stabilization feedback module is connected to the output terminal of the output rectification and filtering module , The feedback output terminal is connected to the feedback input terminal of the PWM control module;

An energy storage module for supplying power to the load, the input terminal of the energy storage module is connected to the output terminal of the output rectification and filtering module, and the output terminal is connected to the load;

Comparing the power supply voltage of the energy storage module for supplying power to the load with the voltage stabilization signal, and outputting a control signal according to the comparison result, the first input terminal of the voltage comparison module is connected to the voltage stabilization signal The voltage stabilization signal output terminal and the second input terminal of the pressure feedback module are connected to the output terminal of the energy storage module;

A standby signal input module that outputs a standby signal;

A standby control module that controls the working state of the PWM control module according to the control signal output by the voltage comparison module, the input terminals of the standby control module are connected to the outputs of the voltage comparison module and the standby signal input module The terminal is connected, and the output terminal is connected to the standby signal control terminal of the PWM control module.

The present invention also provides a television set including the above standby control circuit.

In the standby control circuit provided by the present invention, when entering the standby state, the energy storage module supplies power to the load. At this time, when the voltage comparison module detects that the power supply voltage of the energy storage module is lower than the set lower limit, the output signal controls the PWM control module to work, thereby charging the energy storage module; when the voltage comparison module detects that the energy storage module When the power supply voltage of the module is higher than the set upper limit value, the output signal controls the PWM control module to stop working, and at this time, the energy storage module supplies power to the load. Therefore, in the standby control circuit provided by the present invention, the PWM control module is in an intermittent working state during standby, and can automatically and intermittently charge the energy storage module instantaneously, and then the energy storage module supplies power to the load for a long time. The circuit is simple and low cost. Low; compared with the normally-on state of the PWM control module in the prior art, its power consumption is lower, which can be as low as the power consumption of only one indicator light.

Description of drawings

Fig. 1 is the circuit principle block diagram of the standby control circuit that the embodiment of the present invention provides;

FIG. 2 is a schematic diagram of a circuit principle of a standby control circuit provided by an embodiment of the present invention.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

Referring to FIG. 1 , it is a functional block diagram of a standby control circuit provided by an embodiment of the present invention.

A standby control circuit, comprising sequentially connected EMI filter module 2, rectifier filter module 3, transformer module 4, output rectifier filter module 5, the input terminal of EMI filter module 2 is connected to power supply 1, and the output terminal of output rectifier filter module 5 is connected to Load 6; also includes a PWM control module 7 for controlling the working state of the transformer module 4, the start-up terminal of the PWM control module 7 is connected to the output terminal of the EMI filter module 2, the switch signal output terminal is connected to the controlled terminal of the transformer module 4, and the power input Terminate the second power supply output end of the transformer module 4;

The standby control circuit also includes: feeding back the voltage of the direct current output by the output rectification and filtering module 5 to the PWM control module 7 and a voltage stabilization feedback module 8 that outputs a voltage stabilization signal, the input terminal of the voltage stabilization feedback module 8 is connected to the output rectification and filtering module 5 The output terminal and the feedback output terminal of the PWM control module 7 are connected to the feedback input terminal of the PWM control module 7; the energy storage module 9 that supplies power to the load 6, the input terminal of the energy storage module 9 is connected to the output terminal of the output rectification filter module 5, and the output terminal is connected to the load 6; Compare the power supply voltage and the stabilized voltage signal that the energy storage module 9 supplies to the load 6, and output the voltage comparison module 10 that controls the signal according to the comparison result. The first input terminal of the voltage comparison module 10 is connected to the stabilized voltage feedback module 8 The voltage signal output end and the second input end are connected to the output end of the energy storage module 9; the standby signal input module 11 that outputs the standby signal; the standby control module 12 that controls the working state of the PWM control module 7 according to the control signal output by the voltage comparison module 10 , the input terminals of the standby control module 12 are connected to the output terminals of the voltage comparison module 10 and the standby signal input module 12 , and the output terminals are connected to the standby signal control terminal of the PWM control module 7 . Referring to FIG. 2 , it is a schematic diagram of a circuit principle of a standby control circuit provided by an embodiment of the present invention.

The voltage regulator feedback module 8 includes an optocoupler IC7, an operational amplifier U1A, a voltage regulator tube ZD1, a resistor R74, a resistor R75, a resistor R77, a resistor R87, a resistor R88, a resistor R90 and a resistor R91;

The output end of the output rectification filter module 5 is grounded successively through the resistor R74, the resistor R75, and the resistor R77, and the output end of the output rectifier filter module 5 is also grounded through the resistor R91 and the resistor R88 successively; R90 is connected to the output terminal of the output rectification filter module 5, the inverting input terminal of the operational amplifier U1A is connected to the common connection terminal of the resistor R91 and the resistor R88, and the non-inverting input terminal of the operational amplifier U1A is connected to the common connection terminal of the resistor R74 and the resistor R75; The cathode of tube ZD1 is connected to the common connection end of resistor R74 and resistor R75, and the anode is grounded; pin 1 of optocoupler IC7 is connected to the common connection end of resistor R87 and resistor R90, pin 2 is connected to the output end of operational amplifier U1A, pin 3 is grounded, and pin 4 is connected to the common connection end of resistor R87 and resistor R90. Pin is used as the feedback output terminal of the voltage stabilizing feedback module 8; the common connection terminal of the resistor R91 and the resistor R74 is used as the input terminal of the voltage stabilizing feedback module 8; the common connecting terminal of the resistor R75 and the resistor R77 is used as the voltage stabilizing output of the voltage stabilizing feedback module 8 end.

The energy storage module 9 includes an energy storage capacitor C63 connected between the output rectifying and filtering module 5 and the ground. The negative pole of the energy storage capacitor C63 is grounded and the positive pole serves as the input terminal and output terminal of the energy storage module 9 .

The voltage comparison module 10 includes a resistor R73, a resistor R78, a resistor R84, a resistor R89, an operational amplifier U2B and a diode D16;

The first terminal of the resistor R89 is used as the second input terminal of the voltage comparison module 1, and the second terminal is grounded through the resistor R84; The first input terminal; the cathode of the diode D16 is used as the output terminal of the voltage comparison module 1, and the anode is connected to the output terminal of the operational amplifier U2B through the resistor R78; the resistor R73 is connected between the output terminal of the operational amplifier U2B and the non-inverting input terminal.

The output terminal of the standby signal input module 11 is connected to the anode of the diode D17 , and the cathode of the diode D17 is connected to the input terminal of the standby control module 12 .

The standby control circuit also includes a power-off detection circuit 13 for detecting whether the power supply 1 is powered off.

The power-off detection circuit 13 includes a resistor R23 and a resistor R31;

The output terminal of the EMI filter module 2 is grounded sequentially through the resistor 23 and the resistor R31 , and the common connection terminal of the resistor 23 and the resistor R31 is used as the output terminal of the power-off detection circuit 13 .

The PWM control module 7 includes a PWM controller IC8 and an optocoupler IC5, and the model of the PWM controller IC8 is MIP006;

The LS pin of the PWM controller IC8 is used as the power-off detection terminal of the PWM control module 7, the OUT pin is used as the switching signal output terminal of the PWM control module 7, the VCC pin is used as the power input terminal of the PWM control module 7, and the VIN pin is used as the power input terminal of the PWM control module 7. The power-on starting end of the PWM control module 7, the OFF pin are used as the standby signal control end of the PWM control module 7, the OFF pin is passed through the output end of the optocoupler IC5 reception control module 12, and the FB pin is used as the output of the PWM control module 7. Feedback input.

In the embodiment of the present invention, the operational amplifier U1A, the operational amplifier U2B, and the regulator tube ZD1 are operational amplifiers and voltage regulator tubes integrated in a precision regulator chip with a model number of AP4310.

The working principle of the standby control circuit provided by the embodiment of the present invention will be further described below with reference to FIG. 2 .

The inverting input terminal of the operational amplifier U1A is connected to a voltage dividing sampling circuit composed of resistors R91 and R88, and the non-inverting input terminal is connected to a pull-up resistor R74 to provide a reference voltage for its input; the voltage stabilization feedback module 8 outputs the voltage of the rectifying and filtering module 5 through the resistor After R91 and R88 divide the voltage and sample, input the judgment result to the operational amplifier U1A and then output and feed back to the PWM control module 7, adjust the duty cycle of the PWM signal output by the PWM control module 7 to stabilize the voltage output by the transformer module 4.

The voltage of the cathode of the regulator tube ZD1 is divided by the resistor R75 and the resistor R77 and then input to the non-inverting input terminal of the operational amplifier U2B as the reference voltage of pin 5 of U1B. After the anode voltage of the energy storage capacitor C63 forms a voltage-dividing sampling circuit through the resistors R89 and R84, the sampling voltage of the voltage-dividing sampling circuit is input to the inverting input terminal of the operational amplifier U2B. Resistor R73 is used as the feedback resistor of operational amplifier U2B. The control signal output from the output terminal of the operational amplifier U2B passes through the input terminal of the machine control module 12 through the resistor R78 and the diode D16 in sequence. The control signal output by the operational amplifier U2B and the signal output by the standby signal input module 11 jointly control the standby control module 12 . The function of the diode D16 and the diode D17 is to ensure that the control signal output by the operational amplifier U2B and the signal output by the standby signal input module 11 do not affect each other. The standby control module 12 is connected to the standby signal control terminal of the PWM control module 7 through the optocoupler IC5 to control the operation and stop of the PWM control module 7 .

When the standby signal input module 11 outputs a low level, the standby control circuit enters the standby state from the power-on state at this time. At this time, the power supply voltage of the energy storage capacitor C63 is sufficient, and the output of the operational amplifier U2B is also low. At this time, it is a low-level function. The standby control module 12 further stops the PWM control module 7 from working. At this moment, the load 6 such as the standby indicator light and the infrared receiver is powered by the energy storage capacitor C63.

When the energy storage capacitor C63 consumes power so that the power supply voltage is lower than the set lower limit, the operational amplifier U2B will output a high level after detecting that the power supply voltage of the energy storage capacitor C63 is lower than the set lower limit. The high level acts on the standby control module 12 to make the PWM control module 7 work and charge the energy storage capacitor C63. When the power supply voltage of the energy storage capacitor C63 is higher than the set upper limit value, the operational amplifier U2B will detect that the power supply voltage of the energy storage capacitor C63 is higher than the set upper limit value, and the output of the operational amplifier U2B is low level, at this time The low level acts on the standby control module 12 to stop the PWM control module 7 from working. At this moment, the load 6 such as the standby indicator light and the infrared receiver is powered by the energy storage capacitor C63. In this way, the standby control circuit repeatedly operates.

Therefore, in the standby control circuit provided by the embodiment of the present invention, the PWM control module 7 is in an intermittent working state during standby, and can automatically and intermittently charge the energy storage module 9 instantaneously, and then the energy storage module 9 supplies power to the load 6 for a long time. , the circuit is simple and the cost is low; compared with the normally-on state of the PWM control module in the prior art, its power consumption is lower, which can be as low as the power consumption of only maintaining one indicator light. (The power consumption of the normally-on state of the PWM control module is about 200mW, while the power consumption of the intermittently working PWM control module of the standby control circuit provided by the embodiment of the present invention is about 20mW.)

In addition, in the embodiment of the present invention, after the power supply 1 passes through the capacitor CX2 and the common mode inductor LF3, its live wire passes through the diode D19, and the neutral wire passes through the diode D18, and then connected together, and then connected to the start-up terminal of the PWM control module 7 through the resistor R38 , the live wire or the neutral wire of the power supply is divided and sampled by the voltage dividing resistor R23 and the resistor R31, and then the divided voltage sampling signal is transmitted to the power-off detection terminal of the PWM control module 7 . When the power plug is unplugged—that is, after the power supply 1 is powered off, the power-off detection terminal of the PWM control module 7 is at a low level, and the capacitor CX2 of the EMI filter module 2 is transmitted to the The power-on terminal of the PWM control module 7 , at this time, the capacitor CX2 is discharged through the PWM control module 7 . In this way, the standby loss of the resistor that discharges the capacitor CX2 in the prior art can be omitted, and the circuit is simplified and the cost is saved.

An embodiment of the present invention also provides a television set including the above standby control circuit.

The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the principle of the present invention shall be included within the protection scope of the present invention.

Claims (9)

1. readiness control circuit, comprise the EMI filtration module (2), rectification filtering module (3), transformer module (4), the output rectification filter module (5) that connect successively, the input termination power (1) of described EMI filtration module (2), the output termination load (6) of described output rectification filter module (5); The PWM control module (7) that also comprises the operating state of the described transformer module of control (4), controlled end, the power input of the output of the described EMI filtration module of starting up's termination of described PWM control module (7) (2), the switching signal output described transformer module of termination (4) connect the second source output of described transformer module (4); It is characterized in that,

Described readiness control circuit also comprises:

The galvanic Voltage Feedback that described output rectification filter module (5) is exported is to the voltage stabilizing feedback module (8) of described PWM control module (7) and output voltage regulation signal, and output, the feedback output end of the described output rectification filter module of the input termination of described voltage stabilizing feedback module (8) (5) connects the feedback input end of described PWM control module (7);

Be the energy-storage module (9) of described load (6) power supply, the output of the described output rectification filter module of the input termination of described energy-storage module (9) (5), output termination load (6);

Supply power voltage and described voltage regulation signal that described energy-storage module (9) is powered to described load (6) compare, and according to the voltage comparison module (10) of comparative result output control signal, the first input end of described voltage comparison module (10) connects the voltage regulation signal output of described voltage stabilizing feedback module (8), the output of the second input described energy-storage module of termination (9);

The standby signal input module (11) of output standby signal;

The standby signal input module is controlled the Opportunity awaiting control for linear module (12) of the operating state of described PWM control module (7) according to the described control signal of described voltage comparison module (10) output, the input of described Opportunity awaiting control for linear module (12) all with described voltage comparison module (10) be connected the output of standby signal input module (12) and be connected, export the standby signal control end of the described PWM control module of termination (7).

2. readiness control circuit as claimed in claim 1, it is characterized in that, described voltage stabilizing feedback module (8) comprises optocoupler IC7, amplifier U1A, voltage-stabiliser tube ZD1, resistance R 74, resistance R 75, resistance R 77, resistance R 87, resistance R 88, resistance R 90 and resistance R 91;

The output of described output rectification filter module (5) is successively by described resistance R 74, described resistance R 75, described resistance R 77 ground connection, and the output of described output rectification filter module (5) is also successively by described resistance R 91, described resistance R 88 ground connection;

The output of described amplifier U1A connects the output of described output rectification filter module (5) successively by described resistance R 87 and described resistance R 90, the public connecting end of the described resistance R 91 of the anti-phase input termination of described amplifier U1A and described resistance R 88, the in-phase input end of described amplifier U1A connects the public connecting end of described resistance R 74 and described resistance R 75;

The negative electrode of described voltage-stabiliser tube ZD1 connects public connecting end, the plus earth of described resistance R 74 and described resistance R 75;

1 pin of described optocoupler IC7 connects the public connecting end of described resistance R 87 and described resistance R 90, output that 2 pin meet described amplifier U1A, 3 pin ground connection, 4 pin as the feedback output end of described voltage stabilizing feedback module (8);

The public connecting end of described resistance R 91 and described resistance R 74 is as the input of described voltage stabilizing feedback module (8);

The public connecting end of described resistance R 75 and described resistance R 77 is as the output end of pressure-stabilizing of described voltage stabilizing feedback module (8).

3. readiness control circuit as claimed in claim 1, it is characterized in that, described energy-storage module (9) comprises the storage capacitor C63 that is connected between described output rectification filter module (5) and the ground, described minus earth, anodal simultaneously as input and the output of described energy-storage module (9) that can capacitor C 63.

4. readiness control circuit as claimed in claim 1 is characterized in that, described voltage comparison module (10) comprises resistance R 73, resistance R 78, resistance R 84, resistance R 89, amplifier U2B and diode D16;

The first end of described resistance R 89 as the second input of described voltage comparison module (1), the second end by described resistance R 84 ground connection;

The second end of the described resistance R 89 of anti-phase input termination of described amplifier U2B, in-phase input end are as the first input end of described voltage comparison module (1);

The negative electrode of described diode D16 is as the output of described voltage comparison module (1), anode meets described amplifier U2B by described resistance R 78 output;

Described resistance R 73 is connected between the output and in-phase input end of described amplifier U2B.

5. readiness control circuit as claimed in claim 1 is characterized in that, the anode of the output terminating diode D17 of described standby signal input module (11), and the negative electrode of diode D17 connects the input of described Opportunity awaiting control for linear module (12).

6. readiness control circuit as claimed in claim 1, it is characterized in that, described readiness control circuit also comprises the power failure detection circuit (13) whether the described power supply of detection (1) cuts off the power supply, the outage detection end of the output of the described EMI filtration module of the input termination of described power failure detection circuit (13) (2), the output described PWM control module of termination (7).

7. readiness control circuit as claimed in claim 6 is characterized in that, described power failure detection circuit (13) comprises resistance R 23 and resistance R 31;

By described resistance 23, described resistance R 31 ground connection, the public connecting end of described resistance 23 and described resistance R 31 is as the output of described power failure detection circuit (13) successively for the output of described EMI filtration module (2).

8. such as claim 1 or 6 described readiness control circuits, it is characterized in that, described PWM control module (7) comprises PWM controller IC 8 and optocoupler IC5, and the model of described PWM controller IC 8 is MIP006;

The LS pin of described PWM controller IC 8 is as the outage detection end of described PWM control module (7), the OUT pin is as the switching signal output of described PWM control module (7), the VCC pin is as the power input of described PWM control module (7), the VIN pin is as starting up's end of described PWM control module (7), the OFF pin is as the standby signal control end of described PWM control module (7), the OFF pin connects the output of described Opportunity awaiting control for linear module (12) by described optocoupler IC5, the FB pin is as the feedback input end of described PWM control module (7).

9. a television set is characterized in that, comprises each described readiness control circuit of claim 1-8.

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