A power control circuit, a switching power supply and an electrical device

Abstract

The present invention discloses a power control circuit, a switching power supply and an electrical device for improving standby power consumption. The power control circuit includes a control module and a drive control module. The control module includes an optocoupler current sampling unit, a standby state detection unit, an optocoupler current adjustment unit and an addition unit. The optocoupler current sampling unit detects the current flowing through the optocoupler in real time and the optocoupler current adjustment unit compensates for the current. After the addition unit performs control, the optocoupler current control value is output. The standby state detection unit determines whether the power circuit is in standby mode according to the optocoupler current control value. If it is in standby mode, the optocoupler current adjustment unit outputs a compensation current value to the addition unit to reduce the detection current value output by the optocoupler current sampling unit, thereby achieving the purpose of reducing the optocoupler current. The present invention adjusts the output optocoupler current through the power control circuit to solve the problem that the optocoupler current increases as the output power of the switching power supply decreases, resulting in large standby loss.

Description

Technical Field

[0001] The present application relates to the field of power supplies, and in particular to a power control circuit, a switching power supply, and an electrical device for improving standby power consumption. Background Art

[0002] In general isolated power supplies, optocoupler isolation feedback is a simple and low-cost method. Usually, isolated power supplies use an optocoupler feedback circuit composed of an optocoupler and TL431 for output feedback. However, the optocoupler current increases as the output power of the switching power supply decreases. When the output is unloaded, the optocoupler current reaches its maximum value. At this time, due to the large optocoupler current, the power control chip that drives the power switch tube and the optocoupler feedback circuit loses the most, resulting in higher standby power consumption. Summary of the invention

[0003] Based on this, the embodiments of the present invention provide a power control circuit, a switching power supply and an electrical device for improving standby power consumption, so as to solve the problem of excessive loss caused by increased optocoupler current when the switching power supply is lightly loaded or unloaded.

[0004] In order to solve the above technical problems, the present invention provides a power control circuit for improving standby power consumption. The specific technical solution is as follows: a power control circuit for improving standby power consumption, the power control circuit includes a control module and a drive control module, the drive control module is electrically connected to the control module, and the drive control module is used to be electrically connected to the power switch tube to control the power of the power circuit;

[0005] Among them, the control module includes an optocoupler current sampling unit, a standby state detection unit, an optocoupler current adjustment unit and an addition unit, the optocoupler current sampling unit is used to be electrically connected to the optocoupler of the optocoupler feedback circuit, the standby state detection unit is electrically connected to the optocoupler current adjustment unit, the optocoupler current adjustment unit and the optocoupler current sampling unit are electrically connected to the addition unit respectively, so that the compensation current value output by the optocoupler current adjustment unit and the detection current value sampled by the optocoupler current sampling unit are regulated through the addition unit, and the output end of the addition unit is electrically connected to the standby state detection unit and the drive control module respectively, so as to output the optocoupler current control value regulated by the addition unit to the standby state detection unit and the drive control module;

[0006] The standby state detection unit determines whether the power circuit is in standby mode according to the optocoupler current control value. If it is in standby mode, the optocoupler current regulation unit outputs a compensation current value to the adding unit to reduce the detection current value. The optocoupler current control value output by the adding unit is equal to the sum of the detection current value and the compensation current value. In standby mode, the compensation current value is greater than 0.

[0007] Preferably, after the power circuit enters the standby mode, the compensation current value gradually increases to the target compensation current value. When the compensation current value reaches the target compensation current value, the compensation current value remains unchanged, and the optocoupler current control value changes with the detection current value. When the power circuit exits the standby mode, the compensation current value gradually decreases to 0.

[0008] Preferably, the compensation current value increases linearly or decreases linearly.

[0009] Preferably, the detection current value and the compensation current value are characterized by voltage signals.

[0010] Preferably, the power control circuit is a power control chip.

[0011] Preferably, before the power circuit enters the standby mode, the compensation current value is 0, the detection current value output by the optocoupler current sampling unit increases as the output power of the power circuit decreases, and the detection current value output by the optocoupler current sampling unit decreases as the output power of the power circuit increases.

[0012] Preferably, the standby state detection unit is provided with a first preset current threshold and a second preset current threshold. If the optocoupler current control value is greater than or equal to the first preset current threshold, the standby state detection unit determines that the power circuit enters the standby mode. If the optocoupler current control value is less than or equal to the second preset current threshold, the standby state detection unit determines that the power circuit exits the standby mode, and the first preset current threshold is greater than the second preset current threshold.

[0013] Preferably, in the standby mode of the power circuit, the compensation current value gradually increases to the target compensation current value, the detection current value decreases accordingly, and the optocoupler current control value is equal to the superposition of the detection current value and the compensation current value; or,

[0014] In standby mode, the compensation current value is equal to the target compensation current value, the detection current value decreases as the output power of the power circuit increases, and the optocoupler current control value also decreases accordingly.

[0015] Another embodiment of the present invention provides a switching power supply, including the aforementioned power control circuit for improving the standby power consumption of the power supply, and also including a power switch tube, wherein the drive control module is electrically connected to the power switch tube, and the power switch tube is used to be electrically connected to the power circuit.

[0016] Another embodiment of the present invention provides an electrical device, including the aforementioned switching power supply, and also including a power circuit and an optocoupler feedback circuit, the power circuit is electrically connected to the power switch tube of the switching power supply, the power circuit is also electrically connected to the optocoupler feedback circuit, the optocoupler feedback circuit includes an optocoupler, and the output end of the optocoupler is electrically connected to the optocoupler current sampling unit.

[0017] The present invention has the following beneficial effects: the present invention discloses a power control circuit, a switching power supply and an electrical device for improving standby power consumption. The power control circuit comprises a control module and a drive control module. The control module comprises an optocoupler current sampling unit, a standby state detection unit, an optocoupler current regulating unit and an adding unit. The optocoupler current sampling unit detects the current flowing through the optocoupler in real time and the optocoupler current regulating unit compensates for the current. The adding unit outputs the optocoupler current control value after control. The standby state detection unit determines whether the power circuit is in standby mode according to the optocoupler current control value. If it is in standby mode, the optocoupler current regulating unit outputs the compensation current value to the adding unit to reduce the detection current value sampled by the optocoupler current sampling unit, so as to achieve the purpose of reducing the optocoupler current value, so as to solve the problem that the optocoupler current of the circuit increases as the output power decreases, and when the output is unloaded, the optocoupler current reaches a maximum value, resulting in large standby loss. The present invention adjusts the output optocoupler current through the power control circuit. When the optocoupler enters the standby state, a compensation current value is superimposed on the optocoupler current to reduce the optocoupler current and reduce the standby power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 A typical circuit diagram of the switching power supply of the present invention;

[0020] Figure 2 For the present invention Figure 1 A typical circuit diagram of an embodiment of the optocoupler feedback circuit 2 shown;

[0021] Figure 3 For the present invention Figure 1 A circuit block diagram of an embodiment of the power control circuit 3 shown;

[0022] Figure 4 For the present invention Figure 3 The specific working waveform diagram of the control module 30 regulating the optocoupler current is shown. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0024] The terms "including" and "having" and any variations thereof appearing in the specification, claims and drawings of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or modules is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products or devices. In addition, the terms "first", "second" and "third" are used to distinguish different objects, not to describe a specific order.

[0025] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0026] Figure 1 The figure shows a typical circuit block diagram of the switching power supply of the present invention. The switching power supply includes a power circuit 1, an optocoupler feedback circuit 2, a power control circuit 3, a power switch tube 4, an input terminal Vin and an output terminal Vout. The power control circuit 3 includes a control module 30 and a drive control module 40. The output terminal Vout of the switching power supply is electrically connected to the input terminal of the optocoupler feedback circuit 2 and the load circuit. The output terminal of the optocoupler feedback circuit 2 is electrically connected to the input terminal of the control module 30. The output terminal of the control module 30 is electrically connected to the drive control module 40. The output terminal of the drive control module 40 is electrically connected to the control terminal of the power switch tube 4. The power switch tube 4 is electrically connected to the power circuit 1. The drive control module 40 controls the conduction and cutoff of the power switch tube 4 to drive the power circuit 1 to work.

[0027] The optocoupler feedback circuit 2 is usually composed of an optocoupler and a controllable voltage source (such as a voltage regulator diode). The optocoupler models commonly used for feedback are TLP521, PC817, etc. Here, the optocoupler U1 with the optocoupler model of TLP521 is taken as an example. Figure 2 The following is a typical circuit diagram of a feedback circuit composed of a common optocoupler U1 of optocoupler model TLP521 and a controllable voltage regulator TL431U2. Figure 2As shown, Vout is the output voltage of the switching power supply, Vdd is the power supply voltage of the power control chip of the switching power supply (not shown in the figure, described later), the Vfb signal corresponds to the optocoupler detection current, the ground on the left is the power supply voltage ground of the power control chip, and the ground on the right is the output voltage ground of the switching power supply, and the two are isolated by an optocoupler. TL431U2 has three pins, namely control pin 1, cathode pin 2, and anode pin 3. The internal reference voltage of TL431U2 is Vref. The compensation network composed of resistor R3 and capacitor C1 is used to compensate TL431U2. Resistors R1 and R2 divide the voltage to sample the voltage.

[0028] When the load increases, the output voltage Vout of the switching power supply decreases, and the feedback voltage obtained by the voltage division of resistors R1 and R2 also decreases, and the reference voltage VREF connected to the control pin 1 of TL431U2 also decreases. Therefore, the voltage drop of the cathode pin 2 and the anode pin 3 of TL431U2 increases, and the current decreases, resulting in a decrease in the primary current of the optocoupler, a decrease in the secondary current of the optocoupler, and a decrease in the power consumption of the power control chip of the switching power supply. Conversely, when the load is reduced, the output voltage Vout of the switching power supply increases, and the feedback voltage obtained by the voltage division of resistors R1 and R2 also increases, and the reference voltage VREF connected to the control pin 1 of TL431U2 also increases. Therefore, the voltage drop of the cathode pin 2 and the anode pin 3 of TL431U2 decreases, and the current increases, resulting in an increase in the primary current of the optocoupler, and an increase in the secondary current of the optocoupler, resulting in an increase in the power consumption of the power control chip of the switching power supply and the power consumption of the optocoupler feedback circuit 2.

[0029] As the output power P of the switching power supply decreases, the optocoupler current output by the optocoupler U1 gradually increases, and the power consumption of the power control chip of the switching power supply also gradually increases. When the switching power supply output is unloaded, the power consumption of the power control chip of the switching power supply and the optocoupler feedback circuit 2 due to the optocoupler current also reaches the maximum. In order to reduce the power consumption of the power control chip of the switching power supply and the power consumption of the optocoupler feedback circuit 2 when unloaded, the control module 30 adjusts the optocoupler current output by the optocoupler feedback circuit 2, so that when the output power P of the switching power supply is in a stable state, the optocoupler current is reduced, and the power consumption of the power control chip of the switching power supply and the optocoupler feedback circuit 2 is further reduced.

[0030] Furthermore, the control module 30 includes an optocoupler current sampling unit 31, a standby state detection unit 32, an optocoupler current adjustment unit 33 and an addition unit 34. Figure 1 and Figure 3 As shown, Figure 3The power control circuit 3 of the present invention is a circuit block diagram. The power control circuit 3 includes a control module 30 and a drive control module 40. The input end of the optocoupler current sampling unit 31 of the control module 30 is connected to the output end of the optocoupler U1 in the optocoupler feedback circuit 2. The optocoupler current sampling unit 31 includes Figure 2 The resistor is located between the output end of the optocoupler U1 and the power supply voltage VDD, the output end of the optocoupler current sampling unit 31 and the output end of the optocoupler current regulating unit 33 are electrically connected to the adding unit 34 respectively, the output end of the adding unit 34 is used to connect the drive control module 40, the drive control module 40 is electrically connected to the control end of the power switch tube 4, the drive control module 40 controls the conduction and cutoff of the power switch tube 4, the output end of the adding unit 34 is also electrically connected to the standby state detection unit 32, so as to output the optocoupler current control value I3 output by the adding unit 34 to the standby state detection unit 32, the output end of the standby state detection unit 32 is connected to the input end of the optocoupler current regulating unit 33, the standby state detection unit 32 compares the optocoupler current control value I3 with the first preset current threshold value I31 or the second preset current threshold value I32, determines whether the power circuit is in the standby mode and outputs a signal whether to adjust the current to the optocoupler current regulating unit 33, wherein the first preset current threshold value I31 is greater than the second preset current threshold value I32.

[0031] Specifically, the process of the control module 30 regulating the optocoupler current is as follows:

[0032] The optocoupler current sampling unit 31 samples the optocoupler current flowing through the optocoupler U1 in the optocoupler feedback circuit 2 in real time, and transmits the sampled detection current value I1 to the adding unit 34. The detection current value I1 is output as the optocoupler current control value I3 after being acted upon by the adding unit 34. The standby state detection unit 32 detects the optocoupler current control value I3 and compares the optocoupler current control value I3 with a preset first preset current threshold value I31. The standby state detection unit 32 determines whether the power circuit 1 enters the standby mode based on the comparison result and outputs a signal indicating whether the power circuit 1 enters the standby mode to the optocoupler current regulating unit 33. When the load becomes lighter, the output power P decreases, the detection current value I1 increases, and the optocoupler current control value I3 also increases accordingly. When the output power P decreases to a certain value, the power circuit 1 enters the standby mode. At this time, the optocoupler current control value I3 rises to be greater than or equal to the first preset current value I31. The standby state detection unit 32 knows that the power circuit 1 has entered the standby mode. The standby state detection unit 32 outputs a first signal for current compensation to the optocoupler current adjustment unit 33; the optocoupler current adjustment unit 33 adjusts the optocoupler current according to the received first signal.

[0033] When the power circuit 1 enters the standby mode, the optocoupler current regulating unit 33 outputs the compensation current value I2, and the detection current value I1 and the compensation current value I2 are superimposed by the adding unit 34 and output to the input end of the drive control module 40. After the optocoupler current regulating unit 33 performs current compensation, the current at the input end of the drive control module 40 will also increase, while the load at the output end of the switching power supply remains unchanged. In order to maintain energy balance, the optocoupler feedback circuit 2 adjusts the optocoupler current to a smaller value, so that the optocoupler current control value I3 input to the drive control module 40 after the detection current value I1 and the compensation current value I2 are superimposed is equal to the optocoupler current before adjustment, and the input end of the drive control module 40 returns to the initial value. At this time, the adjusted optocoupler current has been reduced, and the power consumption of the power control circuit 3 and the power consumption of the optocoupler feedback circuit 2 are also reduced accordingly.

[0034] In standby mode, the compensation current value I2 gradually increases to the target compensation current value I21. The target compensation current value I21 is the maximum current value of the compensation. The detection current value I1 decreases as the compensation current value I2 increases, so that the optocoupler current control value I3 input to the drive control circuit remains unchanged, so that the output power P remains unchanged in standby mode. In order to prevent the adjustment process from affecting the output of the switching power supply, when the power circuit 1 enters the standby state, the compensation current value I2 is linearly increased until the target compensation current value I21 is reached. When the power circuit 1 is in standby mode, the optocoupler current is reduced while the output power P of the switching power supply remains unchanged, thereby reducing the standby loss of the power control circuit 3 and the optocoupler feedback circuit 2 in the no-load state. When the compensation current value I2 increases to the target compensation current value I21, the compensation current value I2 remains unchanged, the detection current value I1 decreases as the output power of the switching power supply increases, and the optocoupler current control value I3 changes with the detection current value I1. In this embodiment, after the power circuit 1 is in the standby mode and when the optocoupler current control value I3 is less than or equal to the second preset current threshold value I32, it indicates that the power circuit 1 exits the standby mode, and the standby state detection unit 32 outputs a standby mode exit signal to the optocoupler current adjustment unit 33, and the compensation current value I2 of the optocoupler current adjustment unit 33 gradually decreases from the target compensation current value I21 until it drops to 0, at which time the optocoupler current adjustment unit 33 stops adjusting the optocoupler current. When the compensation current value I2 is 0, the optocoupler current control value I3 output by the addition unit 34 is equal to the detection current value I1, and when the output power P of the switching power supply remains unchanged, the output value of the addition unit 34 and the detection current value I1 remain unchanged. When the output power P of the switching power supply decreases, the output value of the addition unit 34 and the detection current value I1 both increase as the output power P decreases, and when the optocoupler current control value I3 is greater than the first preset current threshold value I31 again, the optocoupler current adjustment unit 33 performs current compensation again to reduce the detection current value I1, thereby reducing the optocoupler current.

[0035] When the load at the output end of the switching power supply is reduced, the optocoupler current of the optocoupler U1 increases as the output power P decreases, resulting in an increase in the power consumption of the power control circuit 3 and the optocoupler feedback circuit 2. The optocoupler current is compensated by the control module 30, and the optocoupler current is made relatively small in the standby mode, thereby reducing the standby power consumption. In the process of the control module 30 regulating the optocoupler current, the optocoupler current regulating unit 33 adjusts the compensation current value I2 by signal processing, such as by processing a voltage signal. Therefore, the control circuit does not generate additional power loss when regulating the optocoupler current.

[0036] In this embodiment, Figure 2 The electrical signal Vfb in is a voltage signal, which is used to characterize the detection current value I1. The compensation current value I2 is also characterized by a voltage signal in this embodiment, so that no additional standby loss is generated. In this embodiment,

[0037] Figure 4 This is an embodiment of the process of regulating the optocoupler current by the control module 30 of the present application, specifically:

[0038] In the time period 0-t1, the output power P of the switching power supply remains unchanged and is relatively large, the switching power supply is in normal working state, and the load is relatively large. At this time, the optocoupler current adjustment unit 33 does not compensate the optocoupler current, and the compensation current value I2 is 0. The detection current value I1 output by the optocoupler current sampling unit 33 increases as the output power P of the power circuit 1 decreases, and the detection current value I1 output by the optocoupler current sampling unit 33 decreases as the output power P of the power circuit 1 increases. The detection current value I1 is equal to the optocoupler current control value I3. In this state, the optocoupler current does not need to be adjusted.

[0039] In the time period t1-t2, due to the load reduction of the load circuit, the output power P of the switching power supply decreases, and the optocoupler current increases as the output power P decreases. The optocoupler current sampling unit 31 samples the optocoupler current in real time and the output detection current value I1 also increases accordingly. The optocoupler current regulation unit 33 does not regulate the optocoupler current, and the compensation current value I2 is 0. At this time, the detection current value I1 is equal to the optocoupler current regulation value I3, and increases synchronously. At t2, the output power P is less than the power value Plpm_in for entering the standby mode, the optocoupler current regulation value I3 is greater than the first preset current threshold value I31, and the power circuit 1 enters the standby mode. In other embodiments of the present application, those skilled in the art may set the specific value of the first preset current threshold value I31 according to the output power of the switching power supply.

[0040] During the time period t2-t3, after the power circuit 1 enters the standby mode, the optocoupler current regulating unit 33 starts to regulate the optocoupler current, and the compensation current value I2 gradually increases, while the output power P of the switching power supply is equal to the power value Plpm_in when entering the standby mode and remains unchanged, so the electrical signal value at the input end of the drive control module 40 also remains unchanged. When the compensation current value I2 gradually increases, it increases linearly in this embodiment. In order to keep the optocoupler current control value I3 unchanged when input to the drive control module 40, the optocoupler current will automatically decrease gradually, so the detection current value I1 output by the optocoupler current sampling unit 31 also gradually decreases, and the sum of the detection current value I1 and the compensation current value I2 is equal to the optocoupler current control value I3 output by the addition unit 4. Until the moment t3, the compensation current value I2 reaches the target compensation current value, which is the maximum compensation value, and the compensation current value I2 remains unchanged thereafter.

[0041] During the time period t3-t4, due to the increase in load, the output power P of the switching power supply increases, but the output power does not reach the exit standby mode, and the power circuit 1 continues to be in the standby mode. At this time, the compensation current value I2 output by the optocoupler current adjustment unit remains unchanged after reaching the target compensation current value. As the output power P increases, the optocoupler current decreases. Therefore, the detection current value I1 output by the optocoupler current sampling unit 31 also decreases, and the optocoupler current control value I3 input to the drive control module 40 also decreases accordingly. At t4, the output power P is greater than or equal to the exit standby mode power value Plpm_out, the optocoupler current reaches the minimum value, and the power consumption of the power control chip of the switching power supply also reaches the minimum.

[0042] In the time period t4-t5, at time t4, the optocoupler current control value I3 is less than or equal to the second preset current threshold value I32, and the power circuit 1 exits the standby mode. In the example, the output power P of the switching power supply is equal to the power value Plpm_out of the exit standby mode and remains unchanged, and the compensation current value I2 gradually decreases until it drops to 0. In order to keep the optocoupler current control value I3 input to the drive control module 40 unchanged, the optocoupler current gradually increases, so the detection current value I1 also gradually increases. When the compensation current value I2 is 0, the switching power supply is in a normal and stable working state. Preferably, in other embodiments of the present application, those skilled in the art can set the specific value of the second preset current threshold value I32 according to the output power of the switching power supply.

[0043] During the time period t5-t6, the switching power supply is in the normal working mode, the optocoupler current regulating unit 33 does not need to regulate the optocoupler current, the compensation current value I2 is 0, and the optocoupler current regulating value I3 at the output end of the adding unit 34 is equal to the detection current value I1. When the output power P of the switching power supply remains unchanged, the optocoupler current also remains unchanged, therefore, the optocoupler current regulating value I3 and the detection current value I1 also remain unchanged.

[0044] During the time period t6-t7, the output power P of the switching power supply decreases, the load of the switching power supply is reduced, and the optocoupler current increases as the output power P decreases, and the detection current value I1 also increases accordingly. The optocoupler current control value I3 increases as the detection current value I1 increases, and the detection current value I1 gradually increases to the first preset current threshold value I31. Among them, at time t7, the detection current value I1 reaches the first preset current threshold value I31, and it is judged that the power circuit 1 enters the standby mode again, and the output power P is equal to the power value Plpm_in for entering the standby mode. Before entering the standby mode, the compensation current value I2 is 0, and the optocoupler current control value I3 at the output end of the adding unit 34 is equal to the detection current value I1.

[0045] During the time period t7-t8, the switching power supply is in standby mode, the output power P of the switching power supply is equal to the power value Plpm_in for entering the standby mode and remains unchanged, and the compensation current value I2 output by the optocoupler current regulating unit 33 gradually increases to the target compensation current value I21. When the compensation current value I2 gradually increases, in order to keep the optocoupler current control value I3 unchanged when input to the drive control module 40, the optocoupler current gradually decreases as the compensation current value I2 increases. Therefore, the detection current value I1 output by the optocoupler current sampling unit 31 also gradually decreases, and the sum of the detection current value I1 and the compensation current value I2 is equal to the optocoupler current control value I3 output by the adding unit 4. When the compensation current value I2 is equal to the target compensation current value I21, the compensation current value I2 and the detection current value I1 remain unchanged.

[0046] During the time period t8-t9, the output power P of the switching power supply rises rapidly, but the output power P is less than the power value Plpm_out for exiting the standby mode. During this time period, the switching power supply is still in the standby mode, the compensation current value I2 is equal to the target compensation current value I21, and the detection current value I1 decreases as the output power P increases. Therefore, the optocoupler current control value I3 output by the input addition unit 34 also decreases accordingly, and the optocoupler current control value I3 is equal to the detection current value I1 plus the target compensation current value I21. After time t9, the output power P is greater than or equal to the power Plpm_out of exiting the standby mode, the power circuit 1 exits the standby mode, and the switching power supply resumes normal working state. Since the output power P is still rising, the compensation current value I2 output by the optocoupler current regulation unit 33 is rapidly reduced to 0, and the detection current value I1 is also rapidly reduced synchronously. Before the compensation current value I2 is reduced to 0, the optocoupler current regulation value I3 is equal to the detection current value I1 plus the target compensation current value I21, and the decrease rate of the optocoupler current regulation value I3 is greater than the decrease rate of any one of the detection current value I1 and the compensation current value I2. When the output power P is stable, the optocoupler current regulation value I3 is equal to the detection current value I1, and both remain unchanged. During this period, the detection current value I1 changes with the change of the output power P.

[0047] After time t9, the switching power supply returns to normal state. In order to ensure that the switching power supply can respond quickly and ensure dynamic performance, the compensation current value I2 output by the optocoupler current regulation circuit 33 can adjust the reduction speed of the compensation current value I2 according to the size of the optocoupler current I. The smaller the optocoupler current I is, the faster the compensation current value I2 decreases, until the compensation current value I2 is 0.

[0048] In this embodiment, the power control circuit 3 is implemented on a chip. In this case, the power control circuit 3 is a power control chip.

[0049] Another embodiment of the present invention provides an electrical device, which includes the aforementioned switching power supply and a load circuit, wherein the load circuit is electrically connected to an input terminal Vin and an output terminal Vout respectively.

[0050] It should be understood that the "plurality" mentioned herein refers to two or more. Those skilled in the art will readily come up with other embodiments of the present application after considering the specification and practicing the application disclosed herein. The present application is intended to cover any variation, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary technical means in the art that are not disclosed in the present application. The description and examples are to be regarded as exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0051] It should be noted that each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other. For the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0052] The above disclosure is only the preferred embodiment of the present application, and certainly cannot be used to limit the scope of rights of the present application. Therefore, equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A power control circuit for improving standby power consumption, characterized in that , the power control circuit includes a regulation module and a drive control module, the drive control module is electrically connected to the regulation module, and the drive control module is used to be electrically connected to the power switch tube to control the power of the power circuit; Wherein, the control module includes an optocoupler current sampling unit, a standby state detection unit, an optocoupler current regulating unit and an adding unit, the optocoupler current sampling unit is used to be electrically connected to the optocoupler of the optocoupler feedback circuit, the standby state detection unit is electrically connected to the optocoupler current regulating unit, the optocoupler current regulating unit and the optocoupler current sampling unit are respectively electrically connected to the adding unit, so that the compensation current value output by the optocoupler current regulating unit and the detection current value sampled by the optocoupler current sampling unit are regulated through the adding unit, and the output end of the adding unit is respectively electrically connected to the standby state detection unit and the drive control module, so as to output the optocoupler current regulation value regulated by the adding unit to the standby state detection unit and the drive control module; The standby state detection unit determines whether the power circuit is in standby mode based on the optocoupler current control value. If it is in standby mode, the optocoupler current regulation unit outputs a compensation current value to the adding unit to reduce the detection current value. The optocoupler current control value output by the adding unit is equal to the sum of the detection current value and the compensation current value. In standby mode, the compensation current value is greater than 0.

2. The power control circuit for improving standby power consumption according to claim 1 is characterized in that After the power circuit enters the standby mode, the compensation current value gradually increases to the target compensation current value. When the compensation current value reaches the target compensation current value, the compensation current value remains unchanged, and the optocoupler current control value changes with the detection current value. When the power circuit exits the standby mode, the compensation current value gradually decreases to 0.

3. The power control circuit for improving standby power consumption according to claim 2 is characterized in that , the compensation current value increases linearly or decreases linearly.

4. The power control circuit for improving standby power consumption according to claim 1 is characterized in that , the detection current value and the compensation current value are represented by voltage signals.

5. The power control circuit for improving standby power consumption according to any one of claims 1 to 4, characterized in that , the power control circuit is a power control chip.

6. The power control circuit for improving standby power consumption according to any one of claims 1 to 4, characterized in that Before the power circuit enters the standby mode, the compensation current value is 0, the detection current value output by the optocoupler current sampling unit increases as the output power of the power circuit decreases, and the detection current value output by the optocoupler current sampling unit decreases as the output power of the power circuit increases.

7. The power control circuit for improving standby power consumption according to any one of claims 1 to 4, characterized in that The standby state detection unit is provided with a first preset current threshold and a second preset current threshold. If the optocoupler current control value is greater than or equal to the first preset current threshold, the standby state detection unit determines that the power circuit enters the standby mode. If the optocoupler current control value is less than or equal to the second preset current threshold, the standby state detection unit determines that the power circuit exits the standby mode, wherein the first preset current threshold is greater than the second preset current threshold.

8. The power control circuit for improving standby power consumption according to any one of claims 1 to 4, characterized in that , when the power circuit is in standby mode, the compensation current value gradually increases to a target compensation current value, the detection current value decreases accordingly, and the optocoupler current control value is equal to the superposition of the detection current value and the compensation current value; or, In the standby mode, the compensation current value is equal to the target compensation current value, the detection current value decreases as the output power of the power circuit increases, and the optocoupler current control value also decreases accordingly.

9. A switching power supply, characterized in that: It comprises a power control circuit for improving standby power consumption according to any one of claims 1-8, and also comprises a power switch tube, wherein the drive control module is electrically connected to the power switch tube, and the power switch tube is used to be electrically connected to the power circuit.

10. An electrical device, characterized in that: It includes the switching power supply according to claim 9, and also includes a power circuit and an optocoupler feedback circuit, the power circuit is electrically connected to the power switch tube of the switching power supply, the power circuit is also electrically connected to the optocoupler feedback circuit, the optocoupler feedback circuit includes an optocoupler, and the output end of the optocoupler is electrically connected to the optocoupler current sampling unit.

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