Switching power supply with efficient anti-surge voltage
By introducing a surge protection unit and a voltage stabilizing output unit into the switching power supply and using components such as resistors and transistors to suppress surge voltage, the problem of lack of protection in the switching power supply is solved, and the safety and overall efficiency of the equipment are improved.
Patent Information
- Application Number
- CN202422919904.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-28
- Publication Date
- 2025-10-17
- Estimated Expiration
- 2034-11-28
AI Technical Summary
Early switching power supplies lacked surge voltage protection, leading to equipment damage and safety risks, especially when voltage suddenly increased.
A switching power supply circuit is designed, which includes a main control IC, a voltage stabilization output unit, an anti-surge voltage unit and a power supply unit. The anti-surge voltage unit is composed of components such as resistors, MOS tubes and transistors. The resistors and transistors work together to suppress surge voltage. In combination with a rectifier bridge, capacitors and filter circuits, a stable operating voltage is provided.
It effectively suppresses surge voltage, improves equipment safety and overall efficiency, prevents equipment damage, and reduces safety risks.
Smart Images
Figure CN223451824U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of switching power supplies, in particular to a switching power supply with high-efficiency surge protection. Background Art
[0002] Early switching power supplies lacked surge protection circuitry on the AC input, creating significant inconvenience and safety risks for end users. Disadvantages: The lack of surge protection at the power input, or poorly implemented, can easily damage downstream loads (electronic devices) due to a sudden increase in input voltage (grid voltage) exceeding the rated voltage. This can cause personal injury and, in severe cases, fire. Utility Model Content
[0003] The purpose of the utility model is to provide a switching power supply with high efficiency surge protection.
[0004] To achieve the above objectives, the present invention provides the following technical solution: a switching power supply with high efficiency surge protection, comprising:
[0005] Main control IC1 is used to output PWM signal after obtaining power;
[0006] A voltage stabilization output unit, used to obtain a PWM signal, stabilize the voltage, and provide a stable operating voltage to the main control IC1; and
[0007] Anti-surge voltage unit, used to suppress the surge voltage generated by the power supply;
[0008] The surge voltage protection unit includes resistors RD1, RD2, a transistor Q3, and a MOS transistor Q2. The drain of the MOS transistor Q2 is connected to the emitter of the transistor Q3 through the resistors RD1 and RD2 in sequence. The gate of the MOS transistor Q2 is connected to the collector of the transistor Q3. The source of the MOS transistor Q2 is connected between RD2 and the emitter of the transistor Q3.
[0009] Furthermore, it also includes a power supply unit for supplying power to the main control IC1 after voltage filtering, and the power supply unit includes a rectifier bridge DB1, a capacitor EC1, resistors R3, R4 and an electrolytic capacitor EC3. The rectifier bridge DB1 is connected to the resistors R3 and R4 in sequence through the surge protection voltage unit. One end of the electrolytic capacitor EC3 is connected to the VDD end of the main control IC1, and the other end of the resistor R4 is connected between the main control IC1 and the electrolytic capacitor EC3. One end of the capacitor EC1 is connected between the surge protection voltage unit and the resistor R3.
[0010] Furthermore, the voltage stabilization output unit includes:
[0011] Filter circuit for obtaining PWM signal, filtering and outputting DC voltage,
[0012] Feedback loop circuit for stabilizing DC voltage at set value; and
[0013] Rectification filter circuit for rectifying and filtering DC voltage at set value and providing stable operating voltage for master IC1.
[0014] Further, the filter circuit comprises switch MOS tube Q1, transformer TR, diode D6, electrolytic capacitors EC4 and EC5, the gate of the switch MOS tube Q1 is connected with the master IC1, the drain of the switch MOS tube Q1 is connected with the P1 end of the transformer TR, the S1 end of the transformer TR is connected with the electrolytic capacitors EC4 and EC5 in parallel, and the diode D6 is connected between the transformer TR and the EC4.
[0015] Further, the feedback loop circuit comprises resistors R16, R17, R18, R19, R20, R21, light emitting diode PCA, diode IC2 and capacitor C6, one end of the resistor R16 is connected with the filter circuit, the other end of the resistor R16 is connected with the anode of the light emitting diode PCA, the cathode of the light emitting diode PCA is connected with the cathode of the diode IC2, one end of the capacitor C6 is connected between the PCA and the IC2, the other end of the C6 is connected with one end of the resistor R18, one end of the resistor R17 is connected between the PCA and the R16, the other end of the resistor R17 is connected between the PCA and the C6, one end of the resistor R19 is connected with the anode of the IC2 through the parallel connection of the R20 and the R21, and the other end of the resistor R18 is connected between the R19 and the R20.
[0016] Further, the rectification filter circuit comprises transformer VCC, diodes D2 and D3 and capacitor EC2, the transformer VCC is connected with the master IC1 through the diode D2 and the capacitor EC2 in series, the anode of the diode D3 is connected between the D2 and the EC2, and the cathode of the diode D3 is connected with the master IC1.
[0017] From the above technical solution, the utility model has the following beneficial effects:
[0018] The switch power supply circuit with high efficient anti-surge voltage is simple, improves the efficiency of the whole machine, and realizes effective protection of input surge voltage. BRIEF DESCRIPTION OF DRAWINGS
[0019] Figure 1 The utility model is a whole circuit diagram. DETAILED DESCRIPTION
[0020] Clearly, the described embodiments are merely a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0021] As shown in Figure 1 The utility model provides a kind of switching power supply with high efficiency anti-surge voltage, including main control IC1, voltage stabilizing output unit, anti-surge voltage unit and power supply unit, power supply unit includes rectifier bridge DB1, capacitor EC1, resistance R3, R4 and electrolytic capacitor EC3, the rectifier bridge DB1 is sequentially connected resistance R3, R4 by anti-surge voltage unit, one end of the electrolytic capacitor EC3 is connected to the VDD end of main control IC1, the other end of the resistance R4 is connected between main control IC1 and electrolytic capacitor EC3, one end of the capacitor EC1 is connected between anti-surge voltage unit and resistance R3;
[0022] When switching power supply input end is connected to AC voltage, rectifier bridge DB1 is rectified, and capacitor EC1 is filtered, so that the voltage across EC1 is 1.3-1.4 times of the input voltage DC voltage, and the electrolytic capacitor EC3 is charged by resistance R3, R4, when the voltage on EC3 rises to about DC18V, power control main control IC1 starts to work, and the 6th pin of main control IC1 starts to output PWM signal.
[0023] Voltage stabilizing output unit includes filter circuit, feedback loop circuit and rectifier filter circuit, filter circuit includes switch MOS tube Q1, transformer TR, diode D6, electrolytic capacitor EC4, EC5, the gate of the switch MOS tube Q1 is connected to the 6th pin of main control IC1 by parallel diode D4, resistance R8, R9, the source of MOS tube Q1 is connected to the 4th pin of main control IC1 by parallel R11, R12, C3, and parallel R11, R12, C3 is connected to the 2nd pin of main control IC1 by parallel triode PCB and capacitor C4, the drain of switch MOS tube Q1 is connected to the P1 end of transformer TR by diode D1, parallel R5, R6, capacitor C1, R7, the S1 end of the transformer TR is connected to parallel electrolytic capacitor EC4, EC5, the diode D6 is connected between transformer TR and EC4.
[0024] The feedback loop circuit comprises resistors R16, R17, R18, R19, R20, R21, a light emitting diode PCA, a diode IC2, and a capacitor C6. One end of the resistor R16 is connected to the filter circuit, the other end of the resistor R16 is connected to the anode of the light emitting diode PCA, the cathode of the light emitting diode PCA is connected to the cathode of the diode IC2, one end of the capacitor C6 is connected between the PCA and the IC2, the other end of the capacitor C6 is connected to one end of the resistor R18, one end of the resistor R17 is connected between the PCA and the R16, the other end of the resistor R17 is connected between the PCA and the C6, one end of the resistor R19 is connected to the anode of the IC2 through the parallel connection of R20 and R21, and the other end of the resistor R18 is connected between the R19 and the R20.
[0025] The rectifier filter circuit comprises a transformer VCC, diodes D2 and D3, and a capacitor EC2. The transformer VCC is connected to the main control IC1 through the diode D2 and the capacitor EC2 in series, the anode of the diode D3 is connected between the D2 and the EC2, and the cathode of the diode D3 is connected to the main control IC1.
[0026] When the 6th pin of the main control IC1 starts to output the PWM signal, the switch MOS tube Q1 works. At this time, the transformer TR transmits the energy on the primary side to the secondary side through the proportional relationship of the two windings of P1 and S1 (voltage reduction and current increase), rectifies through the D6, filters through the two electrolytic capacitors EC4 and EC5, and then outputs the DC voltage. The output voltage of the power supply is stabilized at the set value required by the customer through the feedback loop circuit. The transformer VCC winding obtains the coupling voltage and rectifies through the D2 and D3. The two electrolytic capacitors EC2 and EC3 are filtered to provide a stable working voltage for the power supply control IC1.
[0027] The surge voltage prevention unit comprises resistors RD1, RD2, R13, R14, a triode Q3, a MOS tube Q2, a capacitor C2, a diode D5, and a ZD1. The drain of the MOS tube Q2 is connected to the emitter of the triode Q3 through the resistors RD1 and RD2 in sequence, the gate of the MOS tube Q2 is connected to the collector of the triode Q3, the source of the MOS tube Q2 is connected between the RD2 and the emitter of the triode Q3, the capacitor C2 is connected between the Q2 and the Q3, one end of the resistor R13 is connected between the rectifier bridge DB1 and the capacitor EC1, the other end of the resistor R13 is connected to the emitter of the triode Q3 through the parallel connection of R14 and ZD1, the anode of the diode D5 is connected between the R13 and the R14, and the cathode of the diode D5 is connected to the collector of the triode Q3.
[0028] When the input AC voltage of the switching power supply is abnormal due to lightning or improper use to generate surge voltage, the voltage instantaneously rises above the rated value, at this time, the RD1 and RD2 resistors can effectively hinder and slow down the voltage rise, at this time, the voltage value on the RD1 and RD2 rises rapidly, when the voltage value on the RD1 is greater than 0.6V, and the voltage value on the RD2 is greater than 1.0V, the triode Q3 starts to work, the MOS tube Q2 is turned off and does not work, all the input surge voltage is suppressed through the RD1 and RD2, the surge voltage value is effectively reduced and reaches the effective input voltage value range, at this time, the voltage on the RD1 and RD2 also rapidly decreases, when the voltage value on the RD1 decreases to below 0.2V, and the voltage value on the RD2 is below 0.3V, the triode Q3 is turned off and does not work, and the MOS tube Q2 is turned on and normally works.
[0029] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A switching power supply with high efficiency surge protection, characterized in that: include: Main control IC1 is used to output PWM signal after obtaining power; A voltage stabilization output unit, used to obtain a PWM signal, stabilize the voltage, and provide a stable operating voltage to the main control IC1; and Anti-surge voltage unit, used to suppress the surge voltage generated by the power supply; The surge voltage protection unit includes resistors RD1, RD2, a transistor Q3, and a MOS transistor Q2. The drain of the MOS transistor Q2 is connected to the emitter of the transistor Q3 through the resistors RD1 and RD2 in sequence. The gate of the MOS transistor Q2 is connected to the collector of the transistor Q3. The source of the MOS transistor Q2 is connected between RD2 and the emitter of the transistor Q3.
2. The switching power supply with high efficiency surge protection according to claim 1, characterized in that: It also includes a power supply unit for supplying power to the main control IC1 after voltage filtering. The power supply unit includes a rectifier bridge DB1, a capacitor EC1, resistors R3, R4 and an electrolytic capacitor EC3. The rectifier bridge DB1 is connected to the resistors R3 and R4 in sequence through an anti-surge voltage unit. One end of the electrolytic capacitor EC3 is connected to the VDD end of the main control IC1, and the other end of the resistor R4 is connected between the main control IC1 and the electrolytic capacitor EC3. One end of the capacitor EC1 is connected between the anti-surge voltage unit and the resistor R3.
3. The switching power supply with high efficiency surge protection according to claim 1, characterized in that: The voltage stabilization output unit includes: A filter circuit that obtains PWM signals, filters them, and then outputs a DC voltage. A feedback loop circuit for stabilizing the DC voltage at a set value; and A rectifier and filter circuit is used to rectify and filter the DC voltage of the set value and then provide a stable operating voltage to the main control IC1.
4. The switching power supply with high efficiency surge protection according to claim 3, characterized in that: The filter circuit includes a switch MOS transistor Q1, a transformer TR, a diode D6, and electrolytic capacitors EC4 and EC5. The gate of the switch MOS transistor Q1 is connected to the main control IC1, the drain of the switch MOS transistor Q1 is connected to the P1 terminal of the transformer TR, the S1 terminal of the transformer TR is connected to the electrolytic capacitors EC4 and EC5 connected in parallel, and the diode D6 is connected between the transformer TR and EC4.
5. The switching power supply with high efficiency surge protection according to claim 3, characterized in that: The feedback loop circuit includes resistors R16, R17, R18, R19, R20, R21, a light-emitting diode PCA, a diode IC2, and a capacitor C6. One end of the resistor R16 is connected to the filter circuit, the other end of the resistor R16 is connected to the anode of the light-emitting diode PCA, and the cathode of the light-emitting diode PCA is connected to the cathode of the diode IC2. One end of the capacitor C6 is connected between PCA and IC2, and the other end of C6 is connected to one end of the resistor R18. One end of the resistor R17 is connected between PCA and R16, and the other end of the resistor R17 is connected between PCA and C6. One end of the resistor R19 is connected to the anode of IC2 through R20 and R21 connected in parallel, and the other end of the resistor R18 is connected between R19 and R20.
6. The switching power supply with high efficiency surge protection according to claim 3, characterized in that: The rectifier and filter circuit includes a transformer VCC, diodes D2, D3, and a capacitor EC2. The transformer VCC is connected to the main control IC1 through the series-connected diode D2 and capacitor EC2 in sequence. The anode of the diode D3 is connected between D2 and EC2, and the cathode of the diode D3 is connected to the main control IC1.