Multi-point monitoring feedback switching power supply

Abstract

The utility model relates to the technical field of switching power supplies, and provides a multi-point monitoring feedback switching power supply, which comprises a PWM (Pulse Width Modulation) converter U1, a power switch U3, a fast charge protocol chip U4, and an inductor LFI, a rectifier BD1, an inductor LF2, a transformer T1A and an MOS (Metal Oxide Semiconductor) tube Q1 which are sequentially connected from a power supply input to a power supply output interface J1, the first output end of the rectifier BD1 is connected with the CSS end of the PWM converter U1 through the resistor R2 and the resistor R3, the Drain end of the PWM converter U1 is connected with the second input end of the transformer T1A, the first output end of the transformer T1A is connected with the drain electrode of the MOS tube Q1, the source electrode of the MOS tube Q1 is connected with the power supply output interface J1, the grid electrode of the MOS tube Q1 is connected with the GATE end of the fast charge protocol chip U4, and the second output end of the transformer T1A is connected with the Drain end of the power switch U3. According to the technical scheme, efficient and stable power supply voltage output is realized.

Description

Technical Field

[0001] This utility model relates to the field of switching power supply technology, specifically to a multi-point monitoring and feedback switching power supply. Background Technology

[0002] As a key component in power electronic devices, switching power supplies are responsible for converting input electrical energy into output electrical energy suitable for the load. With the diversification and complexity of electronic devices, the performance requirements for switching power supplies are also increasing. Especially in applications requiring multi-point monitoring and intelligent feedback, traditional switching power supplies are insufficient in terms of the stability and accuracy of output voltage and current.

[0003] The output control of switching power supplies is not flexible or intelligent enough. Traditional switching power supplies mostly use fixed control circuits and parameter settings, which cannot be dynamically adjusted according to the actual needs of the load. This means that in some complex application scenarios, the output of the switching power supply may not meet the precise needs of the load, thus affecting the overall performance and stability of the equipment. In addition, the lack of intelligent feedback mechanisms also makes switching power supplies perform poorly in response to emergencies or abnormal situations, which may lead to equipment failure or safety hazards. Utility Model Content

[0004] This invention proposes a multi-point monitoring and feedback switching power supply, which solves the problem of poor output regulation effect of existing switching power supplies.

[0005] The technical solution of this utility model is as follows:

[0006] A multi-point monitoring and feedback switching power supply includes a main power circuit, a feedback voltage regulation circuit, a synchronous rectification circuit, and a power management circuit. The feedback voltage regulation circuit includes a PWM converter U1, the synchronous rectification circuit includes a power switch U3, and the power management circuit includes a fast charging protocol chip U4. The main power circuit includes an inductor LFI, a rectifier BD1, an inductor LF2, a transformer T1A, and a MOSFET Q1 connected sequentially from the power input to the power output interface J1. The first output terminal of the rectifier BD1 is connected to the first input terminal of the transformer T1A through the inductor LF2, and the second output terminal of the rectifier BD1 is grounded. The second input terminal of the transformer T1A is connected to a resistor... R6, diode D1, and resistor R5 are connected to the first input terminal of transformer T1A. A capacitor C1 is connected in parallel with resistor R5. The first output terminal of rectifier BD1 is connected to the CSS terminal of PWM converter U1 through resistors R2 and R3. The SOURCE terminal of PWM converter U1 is grounded. The Drain terminal of PWM converter U1 is connected to the second input terminal of transformer T1A. The first output terminal of transformer T1A is connected to the drain of MOSFET Q1. The source of MOSFET Q1 is connected to power output interface J1. The gate of MOSFET Q1 is connected to the GATE terminal of fast charging protocol chip U4. The second output terminal of transformer T1A is connected to the Drain terminal of power switch U3.

[0007] Furthermore, the feedback voltage regulation circuit includes an optocoupler U2, resistors R8, R9, and R10, a diode D2, a capacitor C6, a Zener diode ZD5, and a thermistor RT1. The VDDH terminal of the PWM converter U1 is connected to the VAUX power supply via diode D2 and resistor R10 in sequence. The VDDL terminal of the PWM converter U1 is grounded via capacitor C6. The ZCD terminal of the PWM converter U1 is connected to the series connection point of resistors R8 and R9. Resistors R8 and R9 are connected in series between the VAUX power supply and ground. The FB terminal of the PWM converter U1 is connected to the output terminal of the optocoupler U2 via resistor R6. The input terminal of the optocoupler U2 is connected to the fast charging protocol chip U4. The HV terminal of the PWM converter U1 is grounded via capacitor C9. The Fault terminal of the PWM converter U1 is grounded via the thermistor RT1.

[0008] Furthermore, a resistor R11 and a capacitor C3 are connected in parallel to the diode D2, and the resistor R11 and the capacitor C3 are connected in series.

[0009] Furthermore, the synchronous rectification circuit also includes a resistor R17, a capacitor C11, and a resistor R16. The drain terminal of the power switch U3 is connected to the source terminal of the power switch U3 through the resistor R17 and the capacitor C11, and the VD terminal of the power switch U3 is connected to the drain terminal of the power switch U3 through the resistor R16.

[0010] Furthermore, the power management circuit also includes resistor R21, capacitor C13, resistor R20, capacitor C12, resistor R22, capacitor C19, resistor R23, and capacitor C14. The DP, DM, CC1, and CC2 terminals of the fast charging protocol chip U4 are connected to the power output interface J1. The IFB segment of the fast charging protocol chip U4 is connected to the input terminal of the optocoupler U2 through resistor R21 and capacitor C13. The VFB terminal of the fast charging protocol chip U4 is connected to the input terminal of the optocoupler U2 through resistor R20 and capacitor C14. C12 is connected to the input terminal of optocoupler U2. The FB terminal of fast charging protocol chip U4 is connected to the input terminal of optocoupler U2. The Vbus terminal of fast charging protocol chip U4 is connected to the source of MOSFET Q1. The CSP terminal of fast charging protocol chip U4 is connected to the source of MOSFET Q1 through resistor R22 and capacitor C19. The CSN terminal of fast charging protocol chip U4 is grounded. A resistor R23 is connected in parallel between the CSN terminal and the CSP terminal of fast charging protocol chip U4. A capacitor C14 is connected in parallel with resistor R23.

[0011] The working principle and beneficial effects of this utility model are as follows:

[0012] In this invention, the PWM converter U1 adjusts its duty cycle based on the input voltage and feedback signal to control the input current of the transformer T1A, thereby regulating the output voltage. Simultaneously, the power switch U3 in the synchronous rectifier circuit improves rectification efficiency. The fast charging protocol chip U4 in the power management circuit monitors and adjusts the output voltage and current to meet fast charging protocol requirements. This achieves efficient and stable voltage output and supports fast charging, making it suitable for various loads and charging scenarios.

[0013] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0014] Figure 1 This is a circuit diagram of a multi-point monitoring feedback switching power supply according to the present invention.

[0015] In the attached diagram: 1. Main power supply circuit; 2. Feedback voltage regulation circuit; 3. Synchronous rectification circuit; 4. Power management circuit. Detailed Implementation

[0016] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this utility model.

[0017] Example 1

[0018] This embodiment proposes a multi-point monitoring and feedback switching power supply, such as... Figure 1 As shown, the system includes a main power supply circuit, a feedback voltage regulation circuit, a synchronous rectification circuit, and a power management circuit. The feedback voltage regulation circuit includes a PWM converter U1, the synchronous rectification circuit includes a power switch U3, and the power management circuit includes a fast charging protocol chip U4. The main power supply circuit includes an inductor LFI, a rectifier BD1, an inductor LF2, a transformer T1A, and a MOSFET Q1 connected sequentially from the power input to the power output interface J1. The first output terminal of the rectifier BD1 is connected to the first input terminal of the transformer T1A through the inductor LF2. The second output terminal of the rectifier BD1 is grounded, and the second input terminal of the transformer T1A is connected through a resistor R6 and a diode. D1 and resistor R5 are connected to the first input terminal of transformer T1A. A capacitor C1 is connected in parallel with resistor R5. The first output terminal of rectifier BD1 is connected to the CSS terminal of PWM converter U1 through resistors R2 and R3. The SOURCE terminal of PWM converter U1 is grounded. The Drain terminal of PWM converter U1 is connected to the second input terminal of transformer T1A. The first output terminal of transformer T1A is connected to the drain of MOSFET Q1. The source of MOSFET Q1 is connected to power output interface J1. The gate of MOSFET Q1 is connected to the GATE terminal of fast charging protocol chip U4. The second output terminal of transformer T1A is connected to the Drain terminal of power switch U3.

[0019] In this embodiment, the input power supply is connected to the input terminal of rectifier BD1 through inductor LFI. The rectifier converts AC to DC. The first output terminal (positive) of rectifier BD1 is connected to the first input terminal of transformer T1A through inductor LF2. The second input terminal of transformer T1A is connected back to the first input terminal of transformer T1A through resistor R6, diode D1, and resistor R5, forming a feedback circuit. The capacitor C1 connected in parallel with resistor R5 is used to stabilize the voltage. The first output terminal of rectifier BD1 is connected to the CSS terminal of PWM converter U1 through resistors R2 and R3 to provide a feedback signal on the high-voltage side. PWM converter U1 is the core of the feedback voltage regulation circuit. Its SOURCE terminal is grounded, and its Drain terminal is connected to the second input terminal of transformer T1A. By controlling the switching of the power transistor between the SOURCE and Drain terminals inside U1, the current input to transformer T1A is controlled. By adjusting the output of PWM converter U1, precise control of the output voltage can be achieved. Power switch U3 has its CSS terminal connected to the second output terminal of transformer T1A. Power switch U3 is used to improve the efficiency of the switching power supply and reduce energy loss during rectification. The first output terminal of transformer T1A is connected to the drain of MOSFET Q1, and the source of MOSFET Q1 is connected to the power output interface. Fast charging protocol chip U4 is responsible for monitoring the power supply status and adjusting the output voltage and current to meet the requirements of the fast charging protocol, which is achieved by controlling the on / off state of Q1.

[0020] Furthermore, the feedback voltage regulation circuit includes optocoupler U2, resistors R8, R9, and R10, diode D2, capacitor C6, Zener diode ZD5, and thermistor RT1. The VDDH terminal of PWM converter U1 is connected to the VAUX power supply via diode D2 and resistor R10 in sequence. The VDDL terminal of PWM converter U1 is grounded via capacitor C6. The ZCD terminal of PWM converter U1 is connected to the series connection point of resistors R8 and R9. Resistors R8 and R9 are connected in series between the VAUX power supply and ground. The FB terminal of PWM converter U1 is connected to the output terminal of optocoupler U2 via resistor R6. The input terminal of optocoupler U2 is connected to the fast charging protocol chip U4. The HV terminal of PWM converter U1 is grounded via capacitor C9. The Fault terminal of PWM converter U1 is grounded via thermistor RT1.

[0021] Furthermore, a resistor R11 and a capacitor C3 are connected in parallel to diode D2, and the resistor R11 and the capacitor C3 are connected in series.

[0022] The SW1123 chip integrates a 650V gallium nitride power transistor, high-voltage start-up, line voltage undervoltage protection, line voltage power-down detection, line voltage overvoltage protection, X-CAP discharge, VDDL undervoltage protection, VDDL & VDDH overvoltage protection, output overvoltage protection (ZCDOVP), cycle-by-cycle current limiting (ILIMIT), overload protection (OLP), output current overcurrent protection (LPS), and CSS pin open-circuit protection.

[0023] In this embodiment, intelligent voltage regulation and stable output are achieved through a PWM converter U1. The PWM converter U1 dynamically adjusts the output voltage at its drain terminal based on the control signal transmitted from the fast charging protocol chip U4 via optocoupler U2, and in conjunction with the feedback voltage obtained from the output terminal of optocoupler U2 through resistor R6. For power supply, the VDDH terminal draws power from the VAUX power supply, protected by diode D2 along the way. Simultaneously, resistor R11 and capacitor C3 are connected in series and parallel to diode D2 to further suppress inrush current during power-on. The VDDL terminal is grounded through capacitor C6 for filtering. The ZCD terminal uses resistors R8 and R9 to divide the voltage to obtain a reference voltage, while the HV terminal is grounded through capacitor C9 to ensure the safety and stability of the high-voltage side. The entire circuit, through this series of precise component coordination and control strategies, ensures the stability and intelligent regulation of the output voltage.

[0024] Furthermore, the synchronous rectification circuit also includes resistor R17, capacitor C11 and resistor R16. The drain terminal of power switch U3 is connected to the source terminal of power switch U3 through resistor R17 and capacitor C11, and the VD terminal of power switch U3 is connected to the drain terminal of power switch U3 through resistor R16.

[0025] In this embodiment, the drain terminal of power switch U3 is not only connected to the second output terminal of transformer T1A in the main circuit, but also connected to its source terminal through resistor R17 and capacitor C11 in parallel. This provides soft-start for power switch U3, reducing voltage spikes and electromagnetic interference during the switching process. Simultaneously, capacitor C11 acts as a filter, smoothing voltage fluctuations from the drain terminal to the source terminal. Furthermore, the VD terminal (control terminal or gate) of power switch U3 is connected to its drain terminal through resistor R16, providing a voltage feedback path for current limiting protection. The synchronous rectification circuit achieves efficient and stable current rectification, contributing to improved efficiency and stability of the entire switching power supply system.

[0026] Furthermore, the power management circuit also includes resistors R21, C13, R20, C12, R22, C19, R23, and C14. The DP, DM, CC1, and CC2 terminals of the fast charging protocol chip U4 are connected to the power output interface J1. The IFB segment of the fast charging protocol chip U4 is connected to the input terminal of the optocoupler U2 through resistor R21 and capacitor C13. The VFB terminal of the fast charging protocol chip U4 is connected to the input terminal of the optocoupler U2 through resistor R20 and capacitor C12. The FB terminal of the fast charging protocol chip U4 is connected to the input terminal of the optocoupler U2. The Vbus terminal of the fast charging protocol chip U4 is connected to the source of the MOSFET Q1. The CSP terminal of the fast charging protocol chip U4 is connected to the source of the MOSFET Q1 through resistor R22 and capacitor C19. The CSN terminal of the fast charging protocol chip U4 is grounded. A resistor R23 is connected in parallel between the CSN and CSP terminals of the fast charging protocol chip U4, and a capacitor C14 is connected in parallel with resistor R23.

[0027] In this embodiment, the fast charging protocol chip U4 is responsible for monitoring, controlling, and adjusting the output of the switching power supply to adapt to different fast charging protocols and load requirements. The DP, DM, CC1, and CC2 terminals of the fast charging protocol chip U4 are directly connected to the power output interface J1 for communication with the load device, enabling fast charging protocol handshake and data transmission. The Vbus terminal of the fast charging protocol chip U4 is connected to the source of the MOSFET Q1 to monitor the voltage of the output bus, which is crucial for overvoltage protection and undervoltage lockout functions. Simultaneously, the CSP terminal is also connected to the source of the MOSFET Q1 through a filter network composed of resistor R22 and capacitor C19, while the CSN terminal is grounded. A resistor R23 and capacitor C14 are connected in parallel between the two terminals for current sampling and noise filtering, ensuring that the fast charging protocol chip U4 can accurately read the output current information, thereby achieving precise current control and protection.

[0028] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A multi-point monitored feedback switching power supply, characterized by, The power supply main circuit, the feedback voltage regulation circuit, the synchronous rectification circuit and the power management circuit, the feedback voltage regulation circuit includes PWM converter U1, the synchronous rectification circuit includes power switch U3, the power management circuit includes fast charging protocol chip U4, the power supply main circuit includes inductance LFI, rectifier BD1, inductance LF2, transformer T1A and MOS tube Q1 connected in sequence from power supply input to power output interface J1, the first output end of rectifier BD1 is connected with the first input end of transformer T1A through inductance LF2, the second output end of rectifier BD1 is grounded, the second input end of transformer T1A is connected with the first input end of transformer T1A through resistance R6, diode D1 and resistance R5, resistance R5 is connected with capacitor C1 in parallel, the first output end of rectifier BD1 is connected with the CSS end of PWM converter U1 through resistance R2 and resistance R3, the SOURCE end of PWM converter U1 is grounded, the Drain end of PWM converter U1 is connected with the second input end of transformer T1A, the first output end of transformer T1A is connected with the drain of MOS tube Q1, the source of MOS tube Q1 is connected with power output interface J1, the gate of MOS tube Q1 is connected with the GATE end of fast charging protocol chip U4, the second output end of transformer T1A is connected with the Drain end of power switch U3.

2. The multi-point monitored feedback switching power supply of claim 1, wherein, The feedback voltage regulation circuit includes photoelectric coupler U2, resistance R8, resistance R9, resistance R10, diode D2, capacitor C6, voltage stabilizing diode ZD5 and thermistor RT1, the VDDH end of PWM converter U1 is connected with VAUX power supply in sequence through diode D2 and resistance R10, the VDDL end of PWM converter U1 is grounded through capacitor C6, the ZCD end of PWM converter U1 is connected with the series connection point of resistance R8 and resistance R9, resistance R8 and resistance R9 are connected in series between VAUX power supply and ground, the FB end of PWM converter U1 is connected with the output end of photoelectric coupler U2 through resistance R6, the input end of photoelectric coupler U2 is connected with fast charging protocol chip U4, the HV end of PWM converter U1 is grounded through capacitor C9, the Fault end of PWM converter U1 is grounded through thermistor RT1.

3. The multi-point monitored feedback switching power supply of claim 2, wherein, The diode D2 is connected with resistance R11 and capacitor C3 in parallel, and the resistance R11 and capacitor C3 are connected in series.

4. The multi-point monitored feedback switching power supply of claim 1, wherein, The synchronous rectification circuit further includes resistance R17, capacitor C11 and resistance R16, the Drain end of power switch U3 is connected with the Source end of power switch U3 through resistance R17 and capacitor C11, the VD end of power switch U3 is connected with the Drain end of power switch U3 through resistance R16.

5. The multi-point monitored feedback switching power supply of claim 1, wherein, The power management circuit further comprises a resistor R21, a capacitor C13, a resistor R20, a capacitor C12, a resistor R22, a capacitor C19, a resistor R23 and a capacitor C14, the DP end, the DM end, the CC1 end and the CC2 end of the fast charging protocol chip U4 are connected with the power output interface J1, the IFB section of the fast charging protocol chip U4 is connected with the input end of the optical coupler U2 through the resistor R21 and the capacitor C13, the VFB end of the fast charging protocol chip U4 is connected with the input end of the optical coupler U2 through the resistor R20 and the capacitor C12, the FB end of the fast charging protocol chip U4 is connected with the input end of the optical coupler U2, the Vbus end of the fast charging protocol chip U4 is connected with the source electrode of the MOS transistor Q1, the CSP end of the fast charging protocol chip U4 is connected with the source electrode of the MOS transistor Q1 through the resistor R22 and the capacitor C19, the CSN end of the fast charging protocol chip U4 is grounded, the resistor R23 is connected in parallel between the CSN end and the CSP end of the fast charging protocol chip U4, and the capacitor C14 is connected in parallel with the resistor R23.

Images