CN219181405U

CN219181405U - Electrical switching power supply device

Info

Publication number: CN219181405U
Application number: CN202223225877.XU
Authority: CN
Inventors: 赵章; 顾昆阳; 钟绍林; 元晓; 张方瑞; 王维
Original assignee: Xinxiang Wanxin Electric Co ltd
Current assignee: Xinxiang Wanxin Electric Co ltd
Priority date: 2022-12-02
Filing date: 2022-12-02
Publication date: 2023-06-13
Anticipated expiration: 2032-12-02

Abstract

The utility model discloses an electrical switching power supply device, which belongs to the field of switching power supplies and comprises an EMC circuit, a first rectifying and filtering module, a switching transformer, a starting circuit, a PWM controller, a second rectifying and filtering module, a third rectifying and filtering module, a first output module, a second output module, a voltage stabilizing loop, a current limiting protection module, a sampling module and an output overvoltage protection module.

Description

Electrical switching power supply device

Technical Field

The utility model relates to the field of switching power supplies, in particular to an electrical switching power supply device.

Background

The switch mode power supply, also called switching power supply, switching converter is a kind of high frequency electric energy conversion device, which is a kind of power supply. The function is to convert a voltage of one level into a voltage or current required by the user terminal through different types of structures. The input of the electrical switching power supply device is mostly an ac power source (e.g., mains supply) or a dc power source, while the output is mostly a device requiring a dc power source, such as a personal computer, and the electrical switching power supply device performs voltage and current conversion between the two.

With the continuous development of electronic products, the requirements on power supply are higher and higher, the traditional single-conversion-function electric switching power supply device is difficult to meet the current requirements, and particularly in terms of safety, various protection effects such as overload and short circuit are required to be considered, so that the design of the electric switching power supply device with higher safety is required.

Disclosure of Invention

The utility model aims to provide an electric switching power supply device, which solves the problems that the electric switching power supply device with a single conversion function, which is proposed in the background art, needs to take into account various protection effects such as overload and short circuit in terms of safety, and is difficult to meet the current requirements.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

the utility model provides an electric switching power supply device, includes EMC circuit, rectifier filter module I, switch transformer, starting circuit, PWM controller, rectifier filter module II, rectifier filter module III, output module I, output module II, steady voltage loop, current-limiting protection module, sampling module and output overvoltage protection module, input voltage is connected to the input of EMC circuit, and rectifier filter module I's input is connected to the output of EMC circuit, and switch transformer and starting power are connected respectively to rectifier filter module I's output, and the PWM controller is still connected to starting circuit, and switch transformer, steady voltage loop, current-limiting protection module and output overvoltage protection module still are connected respectively to the PWM controller, rectifier filter module II, rectifier filter module III are connected respectively to rectifier filter module I and output module II, and output module I and steady voltage loop are connected respectively to sampling module's input and output, and output module I still connect current-limiting protection module and output overvoltage protection module respectively.

As a further technical scheme of the utility model: the EMC circuit comprises a resistor NTC and a resistor VR1, wherein one end of the resistor NTC is connected with an input interface J1, the other end of the resistor NTC is connected with the resistor VR1, and the other end of the resistor VR1 is connected with the other end of the input interface J1.

As a further technical scheme of the utility model: the first rectifying and filtering module comprises a rectifier DB1 and a capacitor C2, wherein a port 1 of the rectifier DB1 is connected with the other end of the input interface J1, a port 2 of the rectifier DB1 is connected with the capacitor C2, a port 3 of the rectifier DB1 is connected with a resistor NTC and a resistor VR1, and a port 4 of the rectifier DB1 is connected with the other end of the capacitor C2 and the ground terminal.

As a further technical scheme of the utility model: the starting circuit is composed of a resistor R2 and a resistor R3 which are connected in series.

As a further technical scheme of the utility model: the PWM controller comprises a chip U1, and the chip U1 adopts an SP6623F chip.

As a further technical scheme of the utility model: the switching transformer comprises a transformer TR, a diode D2 and a capacitor CY2, wherein a resistor R9, a capacitor C3 and a port of a rectifier DB1 are connected to a port 1 of the transformer TR, an anode of the diode D1, a pin 5 of a chip U1 and a pin 6 of the chip U1 are connected to the port 2 of the transformer TR, a capacitor C3 and a resistor R9 are connected to a cathode of the diode D1 through a resistor R8, a positive electrode of the diode D2 is connected to a port 4 of the transformer TR, a resistor R7 is connected to a cathode of the diode D2, a resistor R3, a pin 2 capacitor C4 and a resistor R4 of the chip U1 are connected to the other end of the resistor R7, and a pin 8 of the chip U1, a pin CY2 and a port 5 of the transformer TR are connected to the other end of the capacitor C4.

As a further technical scheme of the utility model: the second rectifying and filtering module comprises a diode D4 and a capacitor E4, the second output module comprises a resistor R21, an output interface J2 and a capacitor C10, the anode of the diode D4 is connected with the port 7 of the transformer TR, the cathode of the diode D4 is connected with the capacitor E4, the resistor R21, the capacitor C19 and the 2 pin of the output interface J2, and the other end of the capacitor E4 is connected with the other end of the resistor R21, the other end of the capacitor C10, the 1 pin of the output interface J2 and the port 6 of the transformer TR.

As a further technical scheme of the utility model: the rectifying and filtering module III comprises a diode D3 and a capacitor E5, the output module I comprises a resistor R19 and an output interface J2, the anode of the diode D3 is connected with the port 10 of the transformer TR, the cathode of the diode D3 is connected with the capacitor E5, the resistor R19 and the 5 pin of the output interface J2, and the other end of the capacitor E3 is connected with the other end of the resistor R19, the 3 pin of the output interface J2, the port 9 of the transformer TR and the other end of the capacitor CY 2.

As a further technical scheme of the utility model: the sampling module comprises a chip U2, a resistor R13 and a resistor R14, the voltage stabilizing loop comprises a chip U3, the output overvoltage protection module comprises a resistor R15, a resistor R17, a capacitor C9 and a resistor R18, one end of the resistor R13 is connected with a cathode of a diode D3 and the resistor R15, the other end of the resistor R13 is connected with the resistor R14 and a pin 1 of the chip U2, a pin 2 of the chip U2 is connected with the other end of the resistor R14, the resistor R18 and a port K of the chip U3, a port A of the chip U3 is grounded, a port RFF of the chip U3 is connected with the other end of the resistor R15 and the resistor R17, the other end of the resistor R17 is grounded, the other end of the capacitor C9 is connected with the other end of the resistor R18, the other end of the chip U2 is connected with the capacitor C8, the resistor R5 and the resistor R6, the other end of the resistor R5 is connected with the pin 4 of the chip U1, the other end of the pin 4 of the chip U2 is connected with the other end of the capacitor C8 and the pin 3 of the chip U1, and the other end of the resistor R5 is connected with the pin 4 of the chip U1.

As a further technical scheme of the utility model: the model of the chip U2 is EL357, and the model of the chip U3 is CJ431.

Compared with the prior art, the utility model has the beneficial effects that: the electric switching power supply device is provided with an input overvoltage and undervoltage protection circuit, an output overcurrent protection circuit, an output short-circuit protection circuit and the like, can provide various protection effects, and is safer and more reliable in use.

Drawings

FIG. 1 is a schematic block diagram of the prior art;

fig. 2 is a circuit diagram of the present utility model.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1, embodiment 1 is an electrical switching power supply device, including an EMC circuit, a first rectifying and filtering module, a switching transformer, a starting circuit, a PWM controller, a second rectifying and filtering module, a third rectifying and filtering module, a first output module, a second output module, a voltage stabilizing loop, a current limiting protection module, a sampling module and an output overvoltage protection module, wherein an input end of the EMC circuit is connected with an input end of the first rectifying and filtering module, an output end of the first rectifying and filtering module is connected with the switching transformer and the starting power supply respectively, the starting circuit is also connected with the PWM controller, the PWM controller is also connected with the switching transformer, the voltage stabilizing loop, the current limiting protection module and the output overvoltage protection module respectively, the switching transformer is also connected with the second rectifying and filtering module respectively, the second rectifying and filtering module is connected with the first output module and the second output module respectively, an input end and an output end of the sampling module are connected with the first output module and the voltage stabilizing loop respectively, and the first output module is also connected with the current limiting protection module and the output overvoltage protection module respectively.

In embodiment 2, on the basis of embodiment 1, as shown in fig. 2, the EMC circuit includes a resistor NTC and a resistor VR1, one end of the resistor NTC is connected to the input interface J1, the other end of the resistor NTC is connected to the resistor VR1, and the other end of the resistor VR1 is connected to the other end of the input interface J1.

The first rectifying and filtering module comprises a rectifier DB1 and a capacitor C2, wherein a port 1 of the rectifier DB1 is connected with the other end of the input interface J1, a port 2 of the rectifier DB1 is connected with the capacitor C2, a port 3 of the rectifier DB1 is connected with a resistor NTC and a resistor VR1, and a port 4 of the rectifier DB1 is connected with the other end of the capacitor C2 and the ground terminal.

The starting circuit is composed of a resistor R2 and a resistor R3 which are connected in series. The PWM controller comprises a chip U1, and the chip U1 adopts an SP6623F chip.

The switching transformer comprises a transformer TR, a diode D2 and a capacitor CY2, wherein a resistor R9, a capacitor C3 and a port of a rectifier DB1 are connected to a port 1 of the transformer TR, an anode of the diode D1, a pin 5 of a chip U1 and a pin 6 of the chip U1 are connected to the port 2 of the transformer TR, a capacitor C3 and a resistor R9 are connected to a cathode of the diode D1 through a resistor R8, an anode of the diode D2 is connected to a port 4 of the transformer TR, a resistor R7 is connected to a cathode of the diode D2, a resistor R3 is connected to the other end of the resistor R7, a pin 2 of the chip U1, a capacitor C4 and a resistor R4 are connected to a pin 1 of the chip U1, and a pin 8 of the chip U1, a capacitor CY2 and a port 5 of the transformer TR are connected to the other end of the resistor R4.

The second rectifying and filtering module comprises a diode D4 and a capacitor E4, the second output module comprises a resistor R21, an output interface J2 and a capacitor C10, the anode of the diode D4 is connected with the port 7 of the transformer TR, the cathode of the diode D4 is connected with the capacitor E4, the resistor R21, the capacitor C19 and the 2 pin of the output interface J2, and the other end of the capacitor E4 is connected with the other end of the resistor R21, the other end of the capacitor C10, the 1 pin of the output interface J2 and the port 6 of the transformer TR.

The rectifying and filtering module III comprises a diode D3 and a capacitor E5, the output module I comprises a resistor R19 and an output interface J2, the anode of the diode D3 is connected with the port 10 of the transformer TR, the cathode of the diode D3 is connected with the capacitor E5, the resistor R19 and the 5 pin of the output interface J2, and the other end of the capacitor E3 is connected with the other end of the resistor R19, the 3 pin of the output interface J2, the port 9 of the transformer TR and the other end of the capacitor CY 2.

The sampling module comprises a chip U2, a resistor R13 and a resistor R14, the voltage stabilizing loop comprises a chip U3, the output overvoltage protection module comprises a resistor R15, a resistor R17, a capacitor C9 and a resistor R18, one end of the resistor R13 is connected with a cathode of a diode D3 and the resistor R15, the other end of the resistor R13 is connected with the resistor R14 and a pin 1 of the chip U2, a pin 2 of the chip U2 is connected with the other end of the resistor R14, the resistor R18 and a port K of the chip U3, a port A of the chip U3 is grounded, a port RFF of the chip U3 is connected with the other end of the resistor R15 and the resistor R17, the other end of the resistor R17 is grounded, the other end of the capacitor C9 is connected with the other end of the resistor R18, the other end of the chip U2 is connected with a pin 3 of the resistor C8, a resistor R5 is connected with the other end of the resistor R6 and a pin 4 of the chip U1, the other end of the chip U2 is connected with the other end of the resistor C8 and the pin 3 of the chip U1, and the other end of the resistor R5 is connected with the pin 4 of the chip U1. The model of the chip U2 is EL357, and the model of the chip U3 is CJ431.

The working principle is as follows:

when the power supply is powered on through the interface J1, the current charges the input electrolytic capacitor C2 through the negative temperature coefficient thermistor NTC, and the surge current at the power-on moment is restrained by utilizing the temperature resistance characteristic of the NTC thermistor. Lightning protection circuit: when lightning strike occurs, high voltage is generated and is led into a power supply through a power grid, and the power supply is protected by VR 1. When the voltage applied to the two ends of the piezoresistor exceeds the working voltage, the resistance value is reduced, so that the high-voltage energy is consumed on the piezoresistor, and the post-stage circuit is protected.

And (3) inputting a rectifying and filtering circuit: the alternating voltage is rectified by DB1 and filtered by a capacitor C2 to obtain purer direct voltage. If the capacitance C2 becomes smaller, the ac ripple of the output increases. The resistor R8, R9, the capacitor C3 and the diode D1 form a buffer and are connected with the MOS tube in parallel in the PWM, so that the voltage stress of the switching tube is reduced, the EMI is reduced, and primary breakdown does not occur. When the switching tube is turned off, the primary coil of the switching transformer is easy to generate peak voltage and peak current, and the peak voltage and the peak current can be absorbed well through the combination of the components. The primary and secondary poles of the switching transformer TR are opposite in phase. D3 and D4 are rectifier diodes, E4 and E5 are filter capacitors, and R19 and R21 are dummy loads.

The resistors R13, R14, R15, R17, R18, R19, the capacitors C8, C9 and the chips U2 and U3 together form a voltage stabilizing loop and an output overvoltage protection circuit. The output voltage U1+ of the electric switching power supply device is divided by R15 and R17, and a sampling voltage of 2.5V is obtained in normal condition and is sent to an operation end REF of the TL 431. Since the current at the REF terminal is extremely small and can be neglected, the values of R15 and R17 can be selected according to the ratio of the output power supply u1+ to 2.5V, i.e., u1+ =2.5 (1+r15/R17). When U1+ rises, the voltage of the R end rises, lka increases, the current of the light emitting diode of the optocoupler also increases, the pulse width of the secondary control switch pulse of the optocoupler decreases, and the output voltage drops, so that the effect of stabilizing the output voltage is achieved. The operating voltages of TL431 and the photocoupler are generally taken from the output voltage v1+ of the electrical switching power supply device, and R13 constrains the current Ika of TL431 to operate the photocoupler in the linear region. Because the comparator and amplifier gains of TL431 are high, R18 and C9 are commonly connected between the K-R poles in operation to avoid parasitic oscillation.

The power tube current is detected by R5 and R6 sampling resistors connected to the CS pin of the PWM controller. And when the current is too large, the power tube is closed. The purpose of overload protection is achieved.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present utility model may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims

1. The utility model provides an electric switching power supply device, includes EMC circuit, rectifier filter module I, switch transformer, starting circuit, PWM controller, rectifier filter module II, rectifier filter module III, output module I, output module II, steady voltage loop, current-limiting protection module, sampling module and output overvoltage protection module, its characterized in that, input voltage is connected to the input of EMC circuit, and rectifier filter module I's input is connected to the output of EMC circuit, and switch transformer and starting power supply are connected respectively to rectifier filter module I's output, and the PWM controller is still connected to the PWM controller, and switch transformer, steady voltage loop, current-limiting protection module and output overvoltage protection module still are connected respectively, and rectifier filter module II, rectifier filter module III are connected output module I and output module II respectively, and output module I and output of sampling module connect current-limiting protection module and output overvoltage protection module respectively.

2. An electrical switching power supply device according to claim 1, wherein the EMC circuit comprises a resistor NTC and a resistor VR1, one end of the resistor NTC being connected to the input interface J1, the other end of the resistor NTC being connected to the resistor VR1, the other end of the resistor VR1 being connected to the other end of the input interface J1.

3. An electrical switching power supply device according to claim 2, wherein the rectifying and filtering module one includes a rectifier DB1 and a capacitor C2, the port 1 of the rectifier DB1 is connected to the other end of the input interface J1, the port 2 of the rectifier DB1 is connected to the capacitor C2, the port 3 of the rectifier DB1 is connected to the resistor NTC and the resistor VR1, and the port 4 of the rectifier DB1 is connected to the other end of the capacitor C2 and the ground.

4. An electrical switching power supply unit according to claim 3, wherein the start-up circuit is composed of a resistor R2 and a resistor R3 connected in series.

5. An electrical switching power supply unit according to claim 4 wherein said PWM controller comprises a die U1, die U1 being an SP6623F die.

6. An electrical switching power supply unit according to claim 5 wherein the switching transformer comprises a transformer TR, a diode D2 and a capacitor CY2, the port 1 of the transformer TR is connected to the resistor R9, the capacitor C3 and the port of the rectifier DB1, the port 2 of the transformer TR is connected to the anode of the diode D1, the pin 5 of the chip U1 and the pin 6 of the chip U1, the cathode of the diode D1 is connected to the capacitor C3 and the resistor R9 through the resistor R8, the port 4 of the transformer TR is connected to the anode of the diode D2, the cathode of the diode D2 is connected to the resistor R7, the other end of the resistor R7 is connected to the resistor R3, the pin 2 of the chip U1 and the resistor R4, the other end of the resistor R4 is connected to the pin 1 of the chip U1, the other end of the capacitor C4 is connected to the pin 8 of the chip U1, the capacitor CY2 and the port 5 of the transformer TR.

7. An electrical switching power supply device according to claim 6, wherein the rectifying and filtering module two comprises a diode D4 and a capacitor E4, the output module two comprises a resistor R21, an output interface J2 and a capacitor C10, the anode of the diode D4 is connected to the port 7 of the transformer TR, the cathode of the diode D4 is connected to the capacitor E4, the resistor R21, the capacitor C19 and the 2 pin of the output interface J2, and the other end of the capacitor E4 is connected to the other end of the resistor R21, the other end of the capacitor C10, the 1 pin of the output interface J2 and the port 6 of the transformer TR.

8. An electrical switching power supply device according to claim 7, wherein the rectifying and filtering module three comprises a diode D3 and a capacitor E5, the output module one comprises a resistor R19 and an output interface J2, the anode of the diode D3 is connected to the port 10 of the transformer TR, the cathode of the diode D3 is connected to the capacitor E5, the resistor R19 and the 5 pin of the output interface J2, and the other end of the capacitor E3 is connected to the other end of the resistor R19, the 3 pin of the output interface J2, the port 9 of the transformer TR and the other end of the capacitor CY 2.

9. An electrical switching power supply device according to claim 8, wherein the sampling module comprises a chip U2, a resistor R13 and a resistor R14, the voltage stabilizing loop comprises a chip U3, the output overvoltage protection module comprises a resistor R15, a resistor R17, a resistor C9 and a resistor R18, one end of the resistor R13 is connected with the cathode of the diode D3 and the resistor R15, the other end of the resistor R13 is connected with the resistor R14 and the pin 1 of the chip U2, the pin 2 of the chip U2 is connected with the other end of the resistor R14, the resistor R18 and the port K of the chip U3, the port a of the chip U3 is grounded, the port RFF of the chip U3 is connected with the other end of the resistor C9, the other end of the resistor R15 and the resistor R17, the other end of the resistor R17 is grounded, the other end of the resistor C9 is connected with the other end of the resistor R18, the pin 3 of the chip U2 is connected with the capacitor C8, the other end of the resistor R5 and the resistor R6, the other end of the resistor R6 is connected with the pin 4 of the chip U1, the pin 4 of the chip U2 is connected with the other end of the resistor C8 and the other end of the pin 3 of the resistor R1, the other end of the resistor R5 is connected with the other end of the resistor R4 and the chip R1 is connected with the other end of the resistor R4.

10. An electrical switching power supply unit according to claim 9, wherein said chip U2 is of the type EL357 and said chip U3 is of the type CJ431.