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CN-224233537-U - Control power supply circuit for reducing power consumption of power supply

CN224233537UCN 224233537 UCN224233537 UCN 224233537UCN-224233537-U

Abstract

The utility model discloses a control power supply circuit for reducing power consumption of a power supply, and belongs to the technical field of switching power supplies. Aiming at the problems of high standby power consumption and slow dynamic response of the existing scheme, the method comprises the steps of bridging 220 mu F electrolytic capacitor EC2 at the output ends of +5V and +12V, reducing the false load current through charge transfer in light load, improving the static power consumption by more than 50% by matching with a bleeder resistor from 5 KOmega to 10 KOmega, adopting an optocoupler isolator and a PI algorithm to adjust PWM duty ratio in real time, inhibiting +12V ripple to be less than 500mV, designing an overcurrent protection mechanism, cutting off overcurrent and executing grading recovery of a thyristor in 2ms, optimizing dynamic load response, rapidly stabilizing voltage through an EC2 charge release and RC absorption circuit, and adjusting the duty ratio to reach 5 switching cycles. The utility model is compatible with the original power supply architecture, the standby power consumption is less than or equal to 0.5W, the energy efficiency and the transient performance are obviously improved, and the utility model is suitable for energy-saving transformation of air conditioners and the like.

Inventors

  • CHEN QIYUN

Assignees

  • 广东盈科电子有限公司

Dates

Publication Date
20260512
Application Date
20250517

Claims (7)

  1. 1. A control power supply circuit for reducing power consumption of a power supply, comprising: the main power module comprises a bridge rectifier BD1 and a transformer T1, and a PWM control chip U1 connected to the primary side of the transformer; The secondary output module comprises a +12V branch, a +5V branch, a first diode D1, a second diode D2 and a second diode D1, wherein the +12V branch is rectified by the first diode D1 and then sequentially connected with a fifth resistor R5, a fifth electrolytic capacitor EC5 and a second capacitor C2; In the cross-voltage domain coupling module, the positive electrode of the second electrolytic capacitor EC2 is connected to the +12V end, the negative electrode is connected to the +5V end, so that the transfer of charges from the +5V end to the +12V end is realized in a light load mode, and an RC absorption unit formed by a fifth resistor R5 with the resistance value of 2kΩ+/-5% of precision and a third capacitor C3 with the capacitance value of 100nF is connected in parallel; the feedback protection module comprises an optocoupler isolator U2, a thyristor U4 and a thyristor, wherein the input end of the optocoupler isolator U2 is used for sampling +5V output voltage through a voltage division network formed by an eighth resistor R8, a ninth resistor R9 and a sixth resistor R6, the trigger electrode of the thyristor U4 is used for setting an overcurrent threshold through a voltage division circuit of a tenth resistor R10 and an eleventh resistor R11, the anode of the thyristor U4 is connected to the +12V end, and the cathode of the thyristor U4 is grounded.
  2. 2. The power supply circuit for reducing power consumption of the power supply according to claim 1, wherein the frequency control end of the PWM control chip U1 is connected with a fourth electrolytic capacitor EC4, the capacitance of which is 10 μF+ -20%, for setting the switching frequency to 65 kHz+ -5% accuracy.
  3. 3. The control power supply circuit for reducing power consumption according to claim 1, wherein the feedback input end of the PWM control chip U1 is connected to the output end of the optocoupler isolator U2 through a fifth capacitor c5=1nf.
  4. 4. The power supply circuit for reducing power consumption according to claim 1, wherein a bead FB1 is connected in series between the first inductor L1 and the +5V terminal, the impedance characteristic is that the impedance is equal to or more than 100 Ω at 100MHz frequency, and a fourth capacitor C4=47 nF is connected in anti-parallel between the cathode of the zener diode ZD1 and the +5V terminal.
  5. 5. The power supply circuit for controlling power consumption according to claim 1, wherein the fifth resistor R5 in the RC absorption unit is a metal film resistor with a power tolerance value of 1W, and the third capacitor C3 is a multilayer ceramic capacitor made of X7R material with a withstand voltage value of 50V.
  6. 6. The power supply circuit for controlling power consumption according to claim 1, wherein the ratio of the resistance values of the eighth resistor R8 and the ninth resistor R9 in the voltage dividing network is 1:2, and the adjustable end of the ninth resistor R9 is connected to the positive electrode of the light emitting diode of the opto-isolator U2 to form the output voltage fine tuning mechanism.
  7. 7. The control power supply circuit for reducing power consumption of a power supply according to claim 1, wherein a dual safety isolation structure is arranged between primary windings and secondary windings of the transformer T1, the control power supply circuit comprises a first safety capacitor CY1 connected between a primary ground PGND and a secondary ground SGND in a bridging mode, the capacitance value is 2.2 nF+/-10% precision, and a second safety capacitor CY2 connected on a shielding layer pin of the transformer T1 in parallel, and the capacitance value is 4.7 nF+/-10% precision.

Description

Control power supply circuit for reducing power consumption of power supply Technical Field The utility model particularly relates to a control power circuit for reducing power consumption of a power supply. Background With the rapid development of intelligent home appliances, the market is increasingly pressing the demands of low power consumption and high efficiency of home appliances such as air conditioners. At present, the air conditioner switching power supply mostly adopts a traditional design scheme, and has the problems of high standby power consumption, slow dynamic response, low energy efficiency and the like although the stability of a chip scheme is higher. For example, the bleeder resistor is fixed to be 5KΩ in the existing scheme, so that redundant power consumption is remarkable in light load, and in addition, the energy conversion efficiency across the voltage domain is low, and a rapid adjustment mechanism for sudden load change is lacked. Especially in the scene of the long-term circular telegram of air conditioner, traditional power supply scheme can't effectively balance stability and energy-conserving demand, causes the energy extravagant, is difficult to satisfy green low-carbon trade trend. Although the prior proposal is tried to be optimized, the prior proposal is limited by the problems of circuit structure solidification, single feedback mechanism and the like, and the significant consumption reduction is difficult to realize on the premise of not replacing a core device. For example, the bleeder resistor in the prior art is fixed to 5KΩ, resulting in static power consumption of 0.6W or more in light load mode, and dynamic response time >20ms. Therefore, there is a need for an innovative solution compatible with existing architectures to reduce power consumption through intelligent control strategies. Disclosure of Invention The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, an object of the present utility model is to provide a control power supply circuit for reducing power consumption of a power supply, which reduces standby power consumption and reduces power actually used by a switching power supply. The utility model also provides a control power circuit for reducing power consumption of the power supply, which comprises the following steps. The main power module comprises a bridge rectifier BD1 and a transformer T1, and a PWM control chip U1 connected to the primary side of the transformer. The secondary output module comprises a +12V branch, a +5V branch and a first diode D1, wherein the +12V branch is rectified by the first diode D1 and then sequentially connected with a fifth resistor R5, a fifth electrolytic capacitor EC5 and a second capacitor C2, and the +5V branch is rectified by the second diode D2 and the first diode D1 and output. In the cross-voltage domain coupling module, the positive electrode of the second electrolytic capacitor EC2 is connected to the +12v end, the negative electrode is connected to the +5v end, so as to realize the transfer of charges from the +5v end to the +12v end in a light load mode, and an RC absorption unit composed of a fifth resistor r5=2kΩ±5% precision and a third capacitor c3=100deg.nf is connected in parallel. The feedback protection module comprises an optocoupler isolator U2, a thyristor U4 and a thyristor, wherein the input end of the optocoupler isolator U2 is used for sampling +5V output voltage through a voltage division network formed by an eighth resistor R8, a ninth resistor R9 and a sixth resistor R6, the trigger electrode of the thyristor U4 is used for setting an overcurrent threshold through a voltage division circuit of a tenth resistor R10 and an eleventh resistor R11, the anode of the thyristor U4 is connected to the +12V end, and the cathode of the thyristor U4 is grounded. Specifically, further, the frequency control end of the PWM control chip U1 is connected to a fourth electrolytic capacitor EC4, whose capacitance is 10 μf±20%, for setting the switching frequency to 65khz±5% precision. Specifically, further, the feedback input end of the PWM control chip U1 is connected to the output end of the optocoupler isolator U2 through a fifth capacitor c5=1nf. Specifically, a magnetic bead FB1 is connected in series between the first inductor L1 and the +5V end, and the impedance characteristic is that the impedance is more than or equal to 100 omega at the frequency of 100 MHz. Specifically, a fourth capacitor C4 is connected in anti-parallel between the cathode of the zener diode ZD1 and the +5v end, and the capacity of the fourth capacitor C4 is 47nF. The third capacitor C3 is a multilayer ceramic capacitor made of X7R material, the withstand voltage is 50V, the ratio of the resistance values of the eighth resistor R8 and the ninth resistor R9 in the voltage dividing network is 1:2, the adjustable end of the ninth resistor R9 is connected to the pos