Standby power consumption control circuit of multi-path output power supply

Abstract

The utility model discloses a standby power consumption control circuit of a multiplexed output power supply, which relates to the technical field of electric power conversion control and comprises a power supply management module, a pulse width modulation (PWM) control module, a conversion module and a power consumption module. The PWM control module and the conversion module are electrically connected with the power consumption module, the power consumption module comprises a monitoring unit and a protection unit, the monitoring unit is electrically connected with the PWM control module and the conversion module, and the protection unit is electrically connected with the conversion module. According to the utility model, through the synergistic effect of the power management module, the PWM control module, the conversion module and the power consumption module, system signals can be monitored, and the output of the PFC circuit and other paths of voltage can be controlled, thereby achieving the purposes of reducing the input power loss in a standby state and improving the efficiency, and effectively preventing the power supply from generating invalid power in the standby state.

Description

TECHNICAL FIELD

[0001] The utility model relates to power conversion control technical field, concretely is a standby power consumption control circuit of multi -output power supply. BACKGROUND

[0002] With the development of electronic technology, multi-output switching power supply has been widely used in various electronic devices due to its high efficiency, small size, light weight and other advantages. This kind of power supply can provide stable and reliable power support for multiple loads with different needs at the same time. However, in the actual application process, especially when the device is in standby mode, multi-output switching power supply generally has the problem of high standby power consumption, which not only wastes energy, but also may cause the device to heat up, thereby affecting the service life.

[0003] The existing multi-output switching power supply, in order to ensure that all output paths can provide stable voltage at any time, even in standby mode, will maintain a high input power. Although this design ensures the instant response capability of the power supply, it also brings unnecessary energy consumption. In addition, some power supply designs try to reduce the standby mode power consumption by reducing some functions, but this often affects the startup speed and performance stability of the power supply. SUMMARY

[0004] The utility model aims at providing a standby power consumption control circuit of multi-output power supply to solve the problems raised in the above background technology.

[0005] To achieve the above purpose, the utility model provides the following technical scheme: a standby power consumption control circuit of multi-output power supply, comprising a power management module, a PWM control module, a conversion module and a power consumption module, the power management module is electrically connected with the PWM control module through the conversion module, and the PWM control module and the conversion module are electrically connected with the power consumption module, the power consumption module comprises a monitoring unit and a protection unit, the monitoring unit is electrically connected with the PWM control module and the conversion module, and the protection unit is electrically connected with the conversion module.

[0006] Further, the conversion module comprises a high-voltage conversion unit and a low-voltage conversion unit, the high-voltage conversion unit is electrically connected with the power management module, the monitoring unit and the protection unit, and the low-voltage conversion unit is electrically connected with the monitoring unit and the PWM control module.

[0007] Further, the power management module comprises a power management chip U2, the 2 port of the power management chip U2 is electrically connected with the resistance R50 and the capacitor C23, the collector of the photo coupler PC1B is electrically connected with the resistance R50, and the input end of the photo coupler PC1B is electrically connected with the external circuit.

[0008] The 3-port of the power management chip U2 is electrically connected with the resistor R51 and the resistor R93, the resistor R93 is electrically connected with the resistor R94, the resistor R94, the 4-port and the 6-port of the power management chip U2 are all electrically connected with the high-voltage conversion unit, the 5-port of the power management chip U2 is electrically connected with the resistor R91, the high-voltage conversion unit and the protection unit, and the 1-port of the power management chip U2, the resistor R51 and the capacitor C23 are all grounded.

[0009] Further, the high-voltage conversion unit comprises the transformer T1A, the 1-port of the transformer T1A is electrically connected with the resistor R22, the resistor R90, the capacitor C13, the capacitor C41, the feedback FB1 and the HV port, the capacitor C13 is electrically connected with the resistor R24, the resistor R22 is electrically connected with the resistor R25, the resistor R90 and the resistor R92, the resistor R24, the resistor R25 and the resistor R92 are all electrically connected with the cathode of the diode D10, the anode of the diode D10 is electrically connected with the 3-port of the transformer T1A and the collector of the transistor Q6;

[0010] The emitter of the transistor Q6 is electrically connected with the resistor R41, the resistor R45, the resistor R47, the resistor R48 and the capacitor C19, the capacitor C19 is electrically connected with the collector of the transistor Q6 and the anode of the diode D10, the resistor R45 and the resistor R47 are all electrically connected with the capacitor C21, the capacitor C21 and the resistor R45 are electrically connected with the 4-port of the power management chip U2, the base of the transistor Q6 is electrically connected with the resistor R36, the resistor R40 and the resistor R41, the resistor R41 is electrically connected with the resistor R45, the resistor R47, the resistor R48 and the capacitor C19, the resistor R36 is electrically connected with the cathode of the diode D12, the resistor R40 is electrically connected with the anode of the diode D12, and the resistor R36 and the cathode of the diode D12 are both electrically connected with the 6-port of the power management chip U2, the capacitor C41, the resistor R48, the resistor R47 and the capacitor C21 are all grounded;

[0011] The 8-port of the transformer T1A is electrically connected with the capacitor EC5, the capacitor EC6, the capacitor EC7, the anode of the diode U3, the resistor R44 and the resistor R46, the capacitor EC5, the capacitor EC6 and the capacitor EC7 are electrically connected with the resistor R23, the resistor R26, the resistor R29, the resistor R31 and the cathode of the diode D2, the resistor R23, the resistor R29 and the cathode of the diode D2 are electrically connected with the capacitor C14, the capacitor C14 and the cathode of the diode D2 are electrically connected with the 9-port of the transformer T1A, the resistor R26 is electrically connected with the input of the photo-coupler PC1A and the resistor R34, the input of the photo-coupler PC1A and the resistor R34 are electrically connected with the resistor R38, the cathode of the diode U3 and the capacitor C17, the resistor R38 is electrically connected with the capacitor C18, the capacitor C17 and the capacitor C18 are electrically connected with the resistor R31, the resistor R44 and the resistor R46, the resistor R44 and the resistor R46 are connected in parallel with each other and electrically connected with the diode U3.

[0012] Further, the high-voltage conversion unit further comprises a transformer T1B, the 5-port of the transformer T1B is electrically connected with the resistor R106 and the capacitor EC8, the 6-port of the transformer T1B is electrically connected with the Va port and the resistor R37, the resistor R37 is electrically connected with the anode of the diode D11 and the capacitor C20, the cathode of the diode D11 and the capacitor C20 are electrically connected with the protection unit, the capacitor EC8, the resistor R106 and the anode of the diode D9, the cathode of the diode D9 is electrically connected with the cathode of the diode ZD3, the anode of the diode ZD3 is electrically connected with the capacitor C16, the capacitor EC4 and the 6-port of the power management chip U2, and the capacitor C16, the capacitor EC4, the capacitor EC8, the resistor R106 and the 5-port of the transformer T1B are grounded.

[0013] Further, the 4-port of the power management chip U2 is electrically connected with the resistor NTC2, the resistor NTC2 is electrically connected with the resistor R52, the resistor R52 is electrically connected with the cathode of the diode D13, the anode of the diode D13 is electrically connected with the resistor R94 and the Va port.

[0014] Further, the protection unit comprises a photo-coupler PC2B, the emitter of the photo-coupler PC2B is electrically connected with the resistor R21, the resistor R21 is electrically connected with the base of the transistor Q3 and the cathode of the diode ZD1, the anode of the diode ZD1 is electrically connected with the capacitor EC3, the capacitor EC3 and the emitter of the transistor Q3 are electrically connected with the VCC port, the collector of the transistor Q3 and the collector of the photo-coupler PC2B are electrically connected with the cathode of the diode D9 and the cathode of the diode D11, and the anode of the diode ZD1 and the capacitor EC3 are grounded.

[0015] Further, the low-voltage transformation unit comprises a low-frequency transformer LF4, the 1 port and the 4 port of the low-frequency transformer LF4 are electrically connected with the monitoring unit, the 4 port of the low-frequency transformer LF4 is electrically connected with the monitoring unit and the capacitor C15, the 2 port of the low-frequency transformer LF4 is electrically connected with the capacitor C37 and the PWM control module, the capacitor C37 and the 3 port of the low-frequency transformer LF4 are electrically connected with the 12V1 port.

[0016] Further, the monitoring unit comprises an optical coupler PC2A, the input end of the optical coupler PC2A is electrically connected with the resistor R35 and the collector of the transistor Q7, the input end of the optical coupler PC2A is connected with the resistor R39 in parallel, the resistor R35 is electrically connected with the capacitor C15, the 4 port of the low-frequency transformer LF4 and the resistor R31 through the resistor R30, the emitter and the base of the transistor Q7 are electrically connected with the capacitor C22 and the resistor R49, the emitter of the transistor Q7 is electrically connected with the resistor R44, the capacitor C22 and the resistor R49 are electrically connected with the resistor R43 and the 1 port of the low-frequency transformer LF4, and the resistor R43 is electrically connected with the PWM control module.

[0017] Further, the PWM control module comprises a microprocessor CON2, the 1 port of the microprocessor CON2 is electrically connected with the PWM input port, the 2 port of the microprocessor CON2 is electrically connected with the resistor R43, the 3 port, the 4 port and the 5 port of the microprocessor CON2 are electrically connected with the 2 port of the low-frequency transformer LF4, and the 6 port, the 7 port and the 8 port of the microprocessor CON2 are electrically connected with the 3 port of the low-frequency transformer LF4.

[0018] Compared with the prior art, the utility model has the advantages of:

[0019] The power management module, the PWM control module, the transformation module and the power consumption module are cooperated, system signals can be monitored, the output of the PFC circuit and other road voltage can be controlled, the input power loss in the standby state is reduced, the efficiency is improved, the invalid power of the power supply in the standby state is prevented, the perfect protection function is provided through the optical coupler and the diode, and the circuit is not damaged in the abnormal condition. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the system block diagram of standby power consumption control circuit of the utility model;

[0021] Figure 2 It is the circuit diagram of power management module of the utility model;

[0022] Figure 3The circuit diagram of the high-voltage conversion unit of the utility model;

[0023] Figure 4 The circuit diagram of the protection unit of the utility model;

[0024] Figure 5 The circuit diagram of the low-voltage conversion unit of the utility model;

[0025] Figure 6 The circuit diagram of the monitoring unit of the utility model;

[0026] Figure 7 The circuit diagram of the PWM control module of the utility model. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0028] Reference Figures 1-7 The embodiment provides a standby power consumption control circuit of a multi-output power supply, which comprises a power management module, a PWM control module, a conversion module and a power consumption module. The power consumption module comprises a monitoring unit and a protection unit, and the conversion module comprises a high-voltage conversion unit and a low-voltage conversion unit. Specifically, the power management module is electrically connected with the high-voltage conversion unit, the high-voltage conversion unit is electrically connected with the PWM control module, the monitoring unit and the protection unit, the monitoring unit is electrically connected with the low-voltage conversion module and the PWM control module.

[0029] In the embodiment, the power management module comprises a power management chip U2, the 2 port of the power management chip U2 is electrically connected with a resistor R50 and a capacitor C23, the resistor R50 is electrically connected with the collector of a photo-coupler PC1B, and the input end of the photo-coupler PC1B is electrically connected with an external circuit. The 3 port of the power management chip U2 is electrically connected with a resistor R51 and a resistor R93, the resistor R93 is electrically connected with a resistor R94, the resistor R94, the 4 port and the 6 port of the power management chip U2 are all electrically connected with the high-voltage conversion unit, the 5 port of the power management chip U2 is electrically connected with the resistor R91, the high-voltage conversion unit and the protection unit, and the 1 port of the power management chip U2, the resistor R51 and the capacitor C23 are all grounded.

[0030] Further, the fourth port of the power management chip U2 is electrically connected with a resistor NTC2, the resistor NTC2 is electrically connected with a resistor R52, the resistor R52 is electrically connected with a cathode of a diode D13, and an anode of the diode D13 is electrically connected with a resistor R94 and a Va port.

[0031] That is, the power management chip U2 is used for processing input power and generating required voltage level, the resistor R50, the resistor R51, the resistor R93 and the resistor R94 are used for adjusting input / output voltage of the power management chip U2, and the resistor NTC2 is used for monitoring ambient temperature and feeding back to the power management chip U2 to adjust output power.

[0032] In the embodiment, the high-voltage transformation unit comprises a transformer T1A, the 1 port of the transformer T1A is electrically connected with a resistor R22, a resistor R90, a capacitor C13, a capacitor C41, a feedback device FB1 and an HV port, the capacitor C13 is electrically connected with a resistor R24, the resistor R22 is electrically connected with a resistor R25, a resistor R90 and a resistor R92, the resistor R24, the resistor R25 and the resistor R92 are electrically connected with the cathode of a diode D10, the anode of the diode D10 is electrically connected with the 3 port of the transformer T1A and the collector of a transistor Q6. The emitter of the transistor Q6 is electrically connected with a resistor R41, a resistor R45, a resistor R47, a resistor R48 and a capacitor C19, the capacitor C19 is electrically connected with the collector of the transistor Q6 and the anode of the diode D10, the resistor R45 and the resistor R47 are electrically connected with a capacitor C21, the capacitor C21 and the resistor R45 are electrically connected with the 4 port of a power management chip U2, the base of the transistor Q6 is electrically connected with a resistor R36, a resistor R40 and the resistor R41, the resistor R41 is electrically connected with the resistor R45, the resistor R47, the resistor R48 and the capacitor C19, the resistor R36 is electrically connected with the cathode of a diode D12, the resistor R40 is electrically connected with the anode of the diode D12, the resistor R36 and the cathode of the diode D12 are electrically connected with the 6 port of the power management chip U2, the capacitor C41, the resistor R48, the resistor R47 and the capacitor C21 are grounded. The 8 port of the transformer T1A is electrically connected with a capacitor EC5, a capacitor EC6, a capacitor EC7, the anode of a diode U3, a resistor R44 and a resistor R46, the capacitor EC5, the capacitor EC6 and the capacitor EC7 are electrically connected with a resistor R23, a resistor R26, a resistor R29, a resistor R31 and the cathode of a diode D2, the resistor R23, the resistor R29 and the cathode of the diode D2 are electrically connected with a capacitor C14, the capacitor C14 and the cathode of the diode D2 are electrically connected with the 9 port of the transformer T1A, the resistor R26 is electrically connected with the input of an optical coupler PC1A and a resistor R34, the input of the optical coupler PC1A and the resistor R34 are electrically connected with a resistor R38, the cathode of the diode U3 and a capacitor C17, the resistor R38 is electrically connected with a capacitor C18, the capacitor C17 and the capacitor C18 are electrically connected with the resistor R31, the resistor R44 and the resistor R46, the resistor R44 and the resistor R46 are connected in parallel and electrically connected with the diode U3.

[0033] Further, the high-voltage conversion unit further comprises a transformer T1B, the 5th port of the transformer T1B is electrically connected with a resistor R106 and a capacitor EC8, the 6th port of the transformer T1B is electrically connected with a Va port and a resistor R37, the resistor R37 is electrically connected with an anode of a diode D11 and a capacitor C20, a cathode of the diode D11 and the capacitor C20 are both electrically connected with a protection unit, the capacitor EC8, the resistor R106 and an anode of a diode D9, a cathode of the diode D9 is electrically connected with a cathode of a diode ZD3, an anode of the diode ZD3 is electrically connected with a capacitor C16, a capacitor EC4 and a 6th port of a power management chip U2, and the capacitor C16, the capacitor EC4, the capacitor EC8, the resistor R106 and the 5th port of the transformer T1B are all grounded.

[0034] That is, the transformer T1A and the transformer T1B are both used for boosting or reducing alternating voltage, the diode D10 and the diode D11 are both used for converting alternating current into pulsating direct current, the capacitor (such as the capacitor C13, the capacitor C14, etc.) is used for smoothing voltage fluctuation, the resistor (such as the resistor R22, the resistor R23, etc.) is used for current limiting, voltage dividing or impedance matching, and the feedback device FB1 is used for detecting output voltage and comparing with reference voltage so as to adjust PWM duty cycle.

[0035] In the embodiment, the low-voltage conversion unit comprises a low-frequency transformer LF4, the 1st port and the 4th port of the low-frequency transformer LF4 are both electrically connected with a monitoring unit, the 4th port of the low-frequency transformer LF4 is electrically connected with the monitoring unit and a capacitor C15, and the 2nd port of the low-frequency transformer LF4 is electrically connected with a capacitor C37 and a PWM control module, the capacitor C37 and the 3rd port of the low-frequency transformer LF4 are both electrically connected with a 12V1 port.

[0036] That is, the low-frequency transformer LF4 is used for generating a ±12V auxiliary power supply, and the capacitor C37 is used for smoothing the voltage generated by the low-frequency transformer LF4.

[0037] In the embodiment, the monitoring unit comprises an optocoupler PC2A, an input end of the optocoupler PC2A is electrically connected with a resistor R35 and a collector of a transistor Q7, the input end of the optocoupler PC2A is connected with a resistor R39 in parallel, the resistor R35 is electrically connected with a capacitor C15, the 4th port of the low-frequency transformer LF4 and a resistor R31 through a resistor R30, the emitter and the base of the transistor Q7 are both electrically connected with a capacitor C22 and a resistor R49, the emitter of the transistor Q7 is electrically connected with a resistor R44, the capacitor C22 and the resistor R49 are both electrically connected with a resistor R43 and the 1st port of the low-frequency transformer LF4, and the resistor R43 is electrically connected with a PWM control module.

[0038] Further, the protection unit comprises an optical coupler PC2B, an anode of the optical coupler PC2B is electrically connected with a resistor R21, the resistor R21 is electrically connected with a base of a transistor Q3 and a cathode of a diode ZD1, an anode of the diode ZD1 is electrically connected with a capacitor EC3, the capacitor EC3 and an emitter of the transistor Q3 are electrically connected with a VCC port, a collector of the transistor Q3 and a collector of the optical coupler PC2B are electrically connected with a cathode of a diode D9 and a cathode of a diode D11, and the anode of the diode ZD1 and the capacitor EC3 are grounded.

[0039] That is, the diode D9 is used for protecting the circuit from surge voltage, the diode ZD1 is used for voltage clamping device to prevent high transient voltage from damaging other components, the transistor Q3 and the transistor Q7 are used for switching operation or signal amplification, and the optical coupler PC2A and the optical coupler PC2B are used for electrical isolation and signal transmission.

[0040] In the embodiment, the PWM control module comprises a microprocessor CON2, a 1 port of the microprocessor CON2 is electrically connected with a PWM input port, a 2 port of the microprocessor CON2 is electrically connected with a resistor R43, a 3 port, a 4 port and a 5 port of the microprocessor CON2 are electrically connected with a 2 port of a low frequency transformer LF4, and a 6 port, a 7 port and an 8 port of the microprocessor CON2 are electrically connected with a 3 port of the low frequency transformer LF4.

[0041] That is, the microprocessor CON2 receives the PWM signal as input, and the 2 port of the PWM control module is used as a GPIO pin for reading or writing data, such as sensor information or control commands.

[0042] Specifically, the power management chip U2 in the embodiment converts high voltage DC into required output voltage through the transformer T1A and the transformer T1B, and the processed voltage is transmitted to an external controller through the microprocessor CON2, and the external controller can also send a PWM signal to the microprocessor CON2 according to the actual use requirements. Further, according to the sent PWM signal, the switching frequency and the duty cycle of the transformer T1A and the transformer T1B can be controlled, so that the output voltage can be changed. It is worth noting that the high voltage DC after rectification and filtering can be converted into low voltage AC of ±12V through the low frequency transformer LF4, and stable ±12V DC can be obtained after rectification and filtering again.

[0043] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended embodiments and their equivalents.

Claims

1. A standby power consumption control circuit for a multi-output power supply, characterized in that, The power management module, the PWM control module, the conversion module and the power consumption module, the power management module is connected with the PWM control module through the conversion module, and the PWM control module and the conversion module are connected with the power consumption module, the power consumption module includes a monitoring unit and a protection unit, the monitoring unit is connected with the PWM control module and the conversion module, and the protection unit is connected with the conversion module.

2. The standby power consumption control circuit of a multi-output power supply according to claim 1, wherein, The conversion module includes a high-voltage conversion unit and a low-voltage conversion unit, the high-voltage conversion unit is connected with the power management module, the monitoring unit and the protection unit, and the low-voltage conversion unit is connected with the monitoring unit and the PWM control module.

3. The standby power consumption control circuit of a multi-output power supply according to claim 1 or 2, wherein, The power management module includes a power management chip U2, the 2 port of the power management chip U2 is connected with a resistor R50 and a capacitor C23, the resistor R50 is connected with the collector of a photo-coupler PC1B, and the input end of the photo-coupler PC1B is connected with an external circuit. The 3 port of the power management chip U2 is connected with a resistor R51 and a resistor R93, the resistor R93 is connected with a resistor R94, the resistor R94, the 4 port and the 6 port of the power management chip U2 are connected with the high-voltage conversion unit, the 5 port of the power management chip U2 is connected with a resistor R91, the high-voltage conversion unit and the protection unit, and the 1 port of the power management chip U2, the resistor R51 and the capacitor C23 are grounded.

4. The standby power consumption control circuit of a multi-output power supply according to claim 3, wherein, The high-voltage conversion unit includes a transformer T1A, the 1 port of the transformer T1A is connected with a resistor R22, a resistor R90, a capacitor C13, a capacitor C41, a feedback FB1 and an HV port, the capacitor C13 is connected with a resistor R24, the resistor R22 is connected with a resistor R25, a resistor R90 and a resistor R92, the resistor R24, the resistor R25 and the resistor R92 are connected with the cathode of a diode D10, the anode of the diode D10 is connected with the 3 port of the transformer T1A and the collector of a transistor Q6; The emitter of the transistor Q6 is connected with a resistor R41, a resistor R45, a resistor R47, a resistor R48 and a capacitor C19, the capacitor C19 is connected with the collector of the transistor Q6 and the anode of the diode D10, the resistor R45 and the resistor R47 are connected with a capacitor C21, the capacitor C21 and the resistor R45 are connected with the 4 port of the power management chip U2, the base of the transistor Q6 is connected with a resistor R36, a resistor R40 and the resistor R41, the resistor R41 is connected with the resistor R45, the resistor R47, the resistor R48 and the capacitor C19, the resistor R36 is connected with the cathode of a diode D12, the resistor R40 is connected with the anode of the diode D12, the resistor R36 and the cathode of the diode D12 are connected with the 6 port of the power management chip U2, the capacitor C41, the resistor R48, the resistor R47 and the capacitor C21 are grounded. The 8th port of the transformer T1A is electrically connected with the capacitor EC5, the capacitor EC6, the capacitor EC7, the anode of the diode U3, the resistor R44 and the resistor R46, the capacitor EC5, the capacitor EC6 and the capacitor EC7 are electrically connected with the resistor R23, the resistor R26, the resistor R29, the resistor R31 and the cathode of the diode D2, the resistor R23, the resistor R29 and the cathode of the diode D2 are electrically connected with the capacitor C14, the capacitor C14 and the cathode of the diode D2 are electrically connected with the 9th port of the transformer T1A, the resistor R26 is electrically connected with the input of the photo-coupler PC1A and the resistor R34, the input of the photo-coupler PC1A and the resistor R34 are electrically connected with the resistor R38, the cathode of the diode U3 and the capacitor C17, the resistor R38 is electrically connected with the capacitor C18, the capacitor C17 and the capacitor C18 are electrically connected with the resistor R31, the resistor R44 and the resistor R46, the resistor R44 and the resistor R46 are connected in parallel with each other and electrically connected with the diode U3.

5. The standby power consumption control circuit of a multi-output power supply according to claim 4, wherein, The high-voltage conversion unit further comprises a transformer T1B, the 5th port of the transformer T1B is electrically connected with the resistor R106 and the capacitor EC8, the 6th port of the transformer T1B is electrically connected with the Va port and the resistor R37, the resistor R37 is electrically connected with the anode of the diode D11 and the capacitor C20, the cathode of the diode D11 and the capacitor C20 are electrically connected with the protection unit, the capacitor EC8, the resistor R106 and the anode of the diode D9, the cathode of the diode D9 is electrically connected with the cathode of the diode ZD3, the anode of the diode ZD3 is electrically connected with the capacitor C16, the capacitor EC4 and the 6th port of the power management chip U2, and the capacitor C16, the capacitor EC4, the capacitor EC8, the resistor R106 and the 5th port of the transformer T1B are grounded.

6. The standby power consumption control circuit of a multi-output power supply according to claim 3, wherein, The 4th port of the power management chip U2 is electrically connected with the resistor NTC2, the resistor NTC2 is electrically connected with the resistor R52, the resistor R52 is electrically connected with the cathode of the diode D13, the anode of the diode D13 is electrically connected with the resistor R94 and the Va port.

7. The standby power consumption control circuit of a multi-output power supply according to claim 5, wherein, The protection unit comprises a photo-coupler PC2B, the emitter of the photo-coupler PC2B is electrically connected with the resistor R21, the resistor R21 is electrically connected with the base of the transistor Q3 and the cathode of the diode ZD1, the anode of the diode ZD1 is electrically connected with the capacitor EC3, the capacitor EC3 and the emitter of the transistor Q3 are electrically connected with the VCC port, the collector of the transistor Q3 and the collector of the photo-coupler PC2B are electrically connected with the cathode of the diode D9 and the cathode of the diode D11, and the anode of the diode ZD1 and the capacitor EC3 are grounded.

8. The standby power consumption control circuit of a multi-output power supply according to claim 2, wherein, The low-voltage transformation unit includes a low-frequency transformer LF4, the 1st port and the 4th port of the low-frequency transformer LF4 are electrically connected with the monitoring unit, the 4th port of the low-frequency transformer LF4 is electrically connected with the monitoring unit and the capacitor C15, the 2nd port of the low-frequency transformer LF4 is electrically connected with the capacitor C37 and the PWM control module, the capacitor C37 and the 3rd port of the low-frequency transformer LF4 are electrically connected with the 12V1 port.

9. The standby power consumption control circuit of a multi-output power supply as claimed in claim 1 or 2 or 8, wherein, The monitoring unit includes an optical coupler PC2A, the input end of the optical coupler PC2A is electrically connected with the resistor R35 and the collector of the transistor Q7, the input end of the optical coupler PC2A is connected with the resistor R39 in parallel, the resistor R35 is electrically connected with the capacitor C15, the 4th port of the low-frequency transformer LF4 and the resistor R31 through the resistor R30, the emitter and the base of the transistor Q7 are electrically connected with the capacitor C22 and the resistor R49, the emitter of the transistor Q7 is electrically connected with the resistor R44, the capacitor C22 and the resistor R49 are electrically connected with the resistor R43 and the 1st port of the low-frequency transformer LF4, the resistor R43 is electrically connected with the PWM control module.

10. The standby power consumption control circuit of a multi-output power supply according to claim 9, wherein, The PWM control module includes a microprocessor CON2, the 1st port of the microprocessor CON2 is electrically connected with the PWM input port, the 2nd port of the microprocessor CON2 is electrically connected with the resistor R43, the 3rd port, the 4th port and the 5th port of the microprocessor CON2 are electrically connected with the 2nd port of the low-frequency transformer LF4, the 6th port, the 7th port and the 8th port of the microprocessor CON2 are electrically connected with the 3rd port of the low-frequency transformer LF4.

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