CN203706002U - Circuit for improving standby power consumption - Google Patents

Abstract

The utility model discloses a circuit for improving standby power consumption, comprising: an optocoupler feedback circuit, a voltage stabilizing reference circuit, a voltage sampling circuit and a voltage adjusting circuit; wherein, the optocoupler feedback circuit comprises: an optocoupler and a parallel connection The first resistor; the voltage stabilizing reference circuit includes: a voltage stabilizing reference device, a first capacitor and a second resistor; the voltage sampling circuit includes: a third resistor and a fourth resistor connected thereto; the voltage adjusting circuit includes: a triode; a collector of the triode The fifth resistor is connected, the base is connected to the external standby signal source, the sixth resistor is arranged between the base and the standby signal source, the emitter is connected to the ground, and the seventh resistor is arranged between the emitter and the base; The coupling feedback circuit is connected with the voltage stabilizing reference circuit, and the voltage stabilizing reference circuit is respectively connected with the voltage sampling circuit and the voltage adjusting circuit. The utility model uses the standby signal of the main control chip to switch the output reference of the main power supply, thereby reducing the standby power consumption.

Description

A circuit for improving standby power consumption

technical field

The utility model relates to the technical field of television circuits, in particular to a circuit for improving standby power consumption.

Background technique

With the continuous development of smart TVs in recent years, people often want to switch the TV to standby when not using it, instead of directly shutting it down. When the existing TV enters the standby state, the power consumption of the main control display chip is reduced from 12V to 5V, and then from 5V to 3.3V. However, the first voltage drop of the main control display chip is 7V, and the power consumption of this conversion is high, which will cause waste of power consumption, which is not conducive to energy saving and environmental protection.

Contents of the invention

The technical problem to be solved by the utility model is to provide a circuit for improving standby power consumption, and use the standby signal of the main control chip to switch the output reference of the main power supply, thereby reducing the standby power consumption.

In order to solve the above technical problems, the embodiment of the utility model provides a circuit for improving standby power consumption, including: an optocoupler feedback circuit, a voltage stabilization reference circuit, a voltage sampling circuit and a voltage adjustment circuit; wherein, the optocoupler feedback circuit includes : an optocoupler and a first resistor connected in parallel with it; the voltage stabilizing reference circuit includes: a voltage stabilizing reference device, a first capacitor and a second resistor; the voltage sampling circuit includes: a third resistor and a fourth resistor connected thereto The voltage adjustment circuit includes: a triode; the collector of the triode is connected to a fifth resistor, the base of the triode is connected to an external standby signal source, and a first Six resistors, the emitter of the triode is connected to the ground, and a seventh resistor is arranged between the emitter and the base; the optocoupler feedback circuit is connected to the voltage stabilization reference circuit, and the voltage stabilization reference circuit is respectively connected to the The voltage sampling circuit and the voltage adjustment circuit are connected.

Further, a first capacitor and a second resistor are connected between the first pin and the third pin of the voltage stabilizing reference device, the first capacitor and the second resistor are connected in series, and the second pin of the voltage stabilizing reference device pin is connected to ground.

Further, a second capacitor is connected in parallel between the emitter and the base of the triode.

Further, the optocoupler is a PC817 optocoupler.

Further, the voltage stabilizing reference device is a voltage stabilizing reference device modeled as TL43.

Further, the triode is a triode whose model is MMBT4401, 2N2222 or 2N7002.

It can be seen from the above that the circuit for improving standby power consumption provided by the embodiment of the present invention includes: an optocoupler feedback circuit, a voltage stabilization reference circuit, a voltage sampling circuit and a voltage adjustment circuit. When the TV is switched from standby to normal operation, the standby signal source externally connected to the voltage adjustment circuit is at a high level, so that the triode is turned on, so that the fifth resistor is connected to the ground, connected in parallel with the third resistor, and connected to the voltage sampling circuit. The total resistance of the voltage sampling circuit becomes smaller. The voltage of the voltage sampling circuit collected by the voltage stabilization reference circuit becomes smaller. In order to maintain the reference voltage (2.5V), the impedance of the voltage stabilization reference circuit increases, thereby reducing the current of the optocoupler feedback circuit. The power management chip detects the current Decrease will increase the output voltage of the entire circuit, and finally increase the output voltage to 12V. When the standby state is converted to normal operation, the standby signal source is at low level, the triode is turned off, the resistance of the sampling voltage circuit is the third resistor and the fifth resistor, and the total resistance of the sampling voltage circuit becomes larger. In order to maintain the reference voltage (2.5V), the voltage-stabilizing reference circuit reduces its impedance, thereby increasing the current of the optocoupler feedback circuit, and the power management chip detects the increase of the current, which will reduce the output power of the entire circuit, so that The output voltage is adjusted to 7V. It can be seen that when the display main control chip is in normal operation to standby, according to the feedback of the standby signal, the output voltage is automatically stepped down from 12V to 7V, and then the voltage is stepped down from 7V to 5V through other circuits. Compared with the prior art that directly steps down the output voltage from 12V to 5V through other circuits, and the voltage difference is 7V, the utility model circuit switches the output reference of the main power supply through the standby signal, automatically adjusts the output voltage, and makes the From 7V to 5V, the voltage difference is 2V, which can improve conversion efficiency and effectively reduce conversion power consumption during standby, thereby reducing standby power consumption.

Description of drawings

Fig. 1 is a schematic diagram of the connection structure of a circuit for improving standby power consumption provided by the present invention;

FIG. 2 is a schematic diagram of a circuit structure of a circuit for improving standby power consumption provided by the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention.

Referring to FIG. 1 , FIG. 1 is a schematic diagram of a connection structure of a circuit for improving standby power consumption provided by the present invention. The circuit mainly includes: an optocoupler feedback circuit 101 , a voltage stabilizing reference circuit 102 , a voltage sampling circuit 103 and a voltage adjusting circuit 104 . Wherein, the optocoupler feedback circuit 101 is connected with the voltage regulation reference circuit 102 , and the voltage regulation reference circuit 102 is respectively connected with the voltage sampling circuit 103 and the voltage adjustment circuit 104 .

In this embodiment, the optocoupler feedback circuit 101 is connected to an external power management chip.

Referring to FIG. 2 , FIG. 2 is a schematic diagram of a circuit structure of a circuit for improving standby power consumption provided by the present invention. The optocoupler feedback circuit 101 includes: an optocoupler PCB101A and a first resistor RB132 connected in parallel thereto. The regulated voltage reference circuit 102 includes: a regulated voltage reference device UB102 , a first capacitor CB109 and a second resistor RB133 . The voltage sampling circuit 103 includes: a third resistor RB134 and a fourth resistor RB135 connected thereto. The voltage adjustment circuit 104 includes: a triode QB812. The collector C of the triode QB812 is connected to the fifth resistor RB823, the base B is connected to the external standby signal source P, a sixth resistor RB824 is set between the base B and the standby signal source P, and the emitter E and the base B A seventh resistor RB825 is arranged between them, and the emitter E is also connected to the ground.

In this embodiment, a first capacitor CB109 and a second resistor RB133 are connected between the first pin and the third pin of the voltage stabilizing reference device UB102, and the first capacitor CB109 and the second resistor RB133 are connected in series to stabilize the voltage. The second pin of the reference device UB102 is connected to ground.

In this embodiment, the third resistor RB134 is connected between the first pin and the second pin of the voltage-stabilizing reference device UB102, and the fourth resistor RB135 is connected between the first pin of the voltage-stabilizing reference device UB102 and an external 7V voltage between sources.

As an example of this embodiment, the optocoupler PCB101A may be, but not limited to, an optocoupler whose model is PC817.

As an example of this embodiment, the regulated voltage reference device UB102 can be but not limited to a regulated voltage reference device modeled as TL431

As an example of this embodiment, the triode QB812 may be, but not limited to, a triode whose model is MMBT4401, 2N2222 or 2N7002.

It can be seen from the above that the circuit for improving standby power consumption provided by the embodiment of the present invention includes: an optocoupler feedback circuit 101 , a voltage regulation reference circuit 102 , a voltage sampling circuit 103 and a voltage adjustment circuit 104 . When the TV changes from standby to normal operation, the standby signal source P externally connected to the voltage adjustment circuit 101 is at a high level, turning on the transistor QB812, making the fifth resistor RB823 grounded and connected in parallel with the third resistor RB134. Due to the addition of the fifth resistor RB823, the voltage collected by the voltage stabilizing reference circuit 102 is the sum of the voltage of the fourth resistor RB135 plus the voltage of the third resistor RB134 and the fifth resistor RB823 after parallel connection, and the collected voltage is smaller than that in standby , in order to maintain the reference voltage (2.5V), the impedance of the voltage regulator reference circuit 102 will increase, thereby reducing the current for adjusting the optocoupler feedback circuit 101. After the power management chip detects the current reduction, it will increase the output voltage, so that The output voltage of the whole circuit is raised to 12V. The magnitude of the output voltage increase is jointly determined by the fourth resistor RB135 , the third resistor RB134 and the fifth resistor RB823 . When the normal operation is converted into the standby state, the standby signal source P is at a low level, and the triode QB812 is turned off, and the voltage stabilizing reference circuit 102 directly samples the voltages of the third resistor RB134 and the fourth resistor RB135 in the voltage sampling circuit 103. The sampling voltage is larger than normal operation. In order to maintain the reference voltage (2.5V), the impedance of the voltage-stabilizing reference circuit 102 will decrease, thereby increasing the current for adjusting the optocoupler feedback circuit 101. The power management chip detects that the circuit increases. After being large, the output voltage will be reduced, so that the output voltage of the entire circuit is adjusted to 7V.

It can be seen that when the display main control chip is in normal operation to standby, according to the feedback of the standby signal, the output voltage is automatically stepped down from 12V to 7V, and then the voltage is stepped down from 7V to 5V through other circuits. Compared with the prior art that directly steps down the output voltage from 12V to 5V through other circuits, and the voltage difference is 7V, the utility model circuit switches the output reference of the main power supply through the standby signal, automatically adjusts the output voltage, and makes the From 7V to 5V, the voltage difference is 2V, which can improve conversion efficiency and effectively reduce conversion power consumption during standby, thereby reducing standby power consumption.

The above is a preferred embodiment of the present utility model, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present utility model, some improvements and modifications can also be made, these improvements and modifications It is also regarded as the protection scope of the present utility model.

Claims (6)

1. a circuit that improves stand-by power consumption, is characterized in that, comprising: optocoupler feedback circuit, voltage stabilizing reference circuit, voltage sampling circuit and voltage-regulating circuit;

Wherein, described optocoupler feedback circuit comprises: optocoupler and the first resistance being connected in parallel with it;

Described voltage stabilizing reference circuit comprises: voltage stabilizing standard, the first electric capacity and the second resistance;

Described voltage sampling circuit comprises: the 3rd resistance and connected the 4th resistance;

Described voltage-regulating circuit comprises: triode; The collector of described triode is connected with the 5th resistance, the base stage of described triode is connected with outside standby signal source, between described base stage and described standby signal source, be provided with the 6th resistance, the emitter of described triode is connected with ground, is provided with the 7th resistance between described emitter and base stage;

Described optocoupler feedback circuit is connected with voltage stabilizing reference circuit, and described voltage stabilizing reference circuit is connected with described voltage sampling circuit, voltage-regulating circuit respectively.

2. circuit according to claim 1, is characterized in that,

Between the first pin of described voltage stabilizing standard and the 3rd pin, be connected with the first electric capacity and the second resistance, the first electric capacity and the second resistance are connected in series, and the second pin of described voltage stabilizing standard is connected with ground.

3. circuit according to claim 1, is characterized in that,

Between the emitter of described triode and base stage, be also connected in parallel to the second electric capacity.

4. according to the arbitrary described circuit of claims 1 to 3, it is characterized in that,

Described optocoupler is that model is the optocoupler of PC817.

5. according to the arbitrary described circuit of claims 1 to 3, it is characterized in that,

Described voltage stabilizing standard is that model is the voltage stabilizing standard of TL431.

6. according to the arbitrary described circuit of claims 1 to 3, it is characterized in that,

Described triode is that model is the triode of MMBT4401,2N2222 or 2N7002.