CN220043243U - Forward 450W-600W switching power supply without reset circuit - Google Patents
Forward 450W-600W switching power supply without reset circuit Download PDFInfo
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- CN220043243U CN220043243U CN202320209053.9U CN202320209053U CN220043243U CN 220043243 U CN220043243 U CN 220043243U CN 202320209053 U CN202320209053 U CN 202320209053U CN 220043243 U CN220043243 U CN 220043243U
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- 230000005855 radiation Effects 0.000 claims abstract description 5
- 239000003990 capacitor Substances 0.000 claims description 23
- 230000000087 stabilizing effect Effects 0.000 claims description 5
- 239000003381 stabilizer Substances 0.000 claims 1
- 238000001914 filtration Methods 0.000 abstract description 3
- 230000017525 heat dissipation Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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Abstract
The utility model relates to the field of switching power supplies, in particular to a forward 450W-600W switching power supply without a reset circuit, which comprises an input rectifying and filtering circuit, an output overvoltage protection circuit, an output feedback circuit and a power supply management control circuit, and comprises the following components: and the power management control circuit is electrically connected with a temperature control intelligent heat radiation protection circuit. The switch converter adopts a non-reset forward topology form, has the advantages of high reliability and the like caused by low voltage stress of a switch tube and no bridge arm straight-through, and has no problem of resetting and releasing energy of magnetic cores of other forward transformers, thus being more reliable.
Description
Technical Field
The utility model relates to the field of switching power supplies, in particular to a forward 450W-600W switching power supply without a reset circuit.
Background
Is widely used in various industrial devices. The alternating current of the power grid is converted into direct current to be supplied to electronic industrial equipment, the direct current is supplied to a plurality of industrial equipment, the output power of the power supply and the volume of the power supply have certain requirements, the reliability is high, and the average fault-free working time is up to hundreds of thousands of hours.
In order to meet the reliability requirements of power supplies, there is a need for a switching power supply that balances the reliability and cost performance requirements.
Disclosure of Invention
Aiming at the defects existing in the prior art, the utility model provides a forward 450W-600W switching power supply without a reset circuit, which has the following specific technical scheme:
a forward 450W-600W switching power supply without a reset circuit comprises an input rectifying and filtering circuit, an output overvoltage protection circuit, an output feedback circuit and a power management control circuit, and comprises:
and the power management control circuit is electrically connected with a temperature control intelligent heat radiation protection circuit.
As an improvement of the above technical solution, the forward converting circuit without reset circuit includes a switching tube (Q3, Q4), a clamping diode (D10, D11), a transformer (T1, T2), an overcurrent resistor (R12, R16, R18, R19), a high-voltage capacitor (C13, C14, C15, C16), and a rectifying diode D32.
As an improvement of the above technical solution, the gate of the switch Q4 is electrically connected to the transformer T2, the drain of the switch Q4 is connected to the cathode of the clamp diode D11, the source of the switch Q4 is electrically connected to the transformer T1, the anode of the clamp diode D11 is electrically connected to the transformer T1, the gate of the switch Q3 is electrically connected to the transformer T2, the drain of the switch Q3 is electrically connected to the transformer T1, the cathode of the clamp diode D10 is connected to the source of the switch Q4, the anode of the clamp diode D10 is connected to the source of the switch Q3, the source of the switch Q3 is connected to the ground through an overcurrent resistor (R18, R19), a high-voltage capacitor (C13, C14) is connected between the source and the drain of the switch Q3, a high-voltage capacitor (C15, C16) is connected between the gate of the switch Q4 and the drain, a overcurrent resistor R12 is connected between the gate of the switch Q4 and the source of the switch Q1, a rectifier circuit is connected to the anode of the switch Q1, and the rectifier circuit is connected to the anode of the rectifier diode D32.
As an improvement of the above technical solution, the temperature control intelligent heat dissipation protection circuit includes an NPN triode (Q200), a PNP triode (Q122), resistors (R205, R219, R220, R222, R223, R224), a thermistor RTH3, a voltage regulator ZD200, an electrolytic capacitor (C201, C221), a precision voltage regulator programmer AZ431, and a fan.
As an improvement of the above technical solution, a collector of the NPN triode Q200 is electrically connected to the transformer T1, a resistor R205 is connected between a base and a collector of the NPN triode Q200, a base of the NPN triode Q200 is connected to a cathode of the voltage regulator ZD200, an anode of the electrolytic capacitor C201 is connected to an emitter of the NPN triode Q200, a cathode of the electrolytic capacitor C201 is grounded, an emitter of the NPN triode Q200 is connected to an emitter of the PNP triode Q122, a collector of the PNP triode Q122 is connected to an anode of the electrolytic capacitor C221, an anode of the electrolytic capacitor C221 is connected to an anode of the fan, a base of the PNP triode Q122 is connected to an emitter of the resistor R222, an emitter of the PNP triode Q122 is connected to one end of the thermistor RTH3, the other end of the thermistor RTH3 is connected to a pin of the precision voltage regulator IC3, an emitter of the precision voltage regulator IC3 is connected to an emitter of the PNP triode Q122, a secondary pin of the precision voltage regulator IC3 is connected to a secondary pin of the precision resistor IC 220, and the precision resistor D3 is connected to the precision resistor D221 through the precision resistor D, and the precision resistor D221 is connected to the precision resistor D3 between the precision resistor D and the precision resistor D221.
The utility model has the beneficial effects that:
the switch converter adopts a non-reset forward topology form, has the advantages of high reliability and the like due to low voltage stress of a switch tube and no bridge arm direct connection, and has no problem of resetting and releasing energy of magnetic cores of other forward transformers, thus being more reliable.
Drawings
FIG. 1 is a circuit diagram of the overall utility model;
FIG. 2 is a diagram of a reset-free forward converter circuit of the present utility model;
fig. 3 is a circuit diagram of the temperature control intelligent heat dissipation protection circuit of the utility model.
Detailed Description
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
Referring to fig. 1-3, a forward 450W-600W switching power supply without a reset circuit includes an input rectifying and filtering circuit, an output overvoltage protection circuit, an output feedback circuit, and a power management control circuit, including:
and the power management control circuit is electrically connected with a temperature control intelligent heat radiation protection circuit.
In one embodiment, referring to fig. 2, the non-reset circuit forward converting circuit includes switching transistors (Q3, Q4), clamping diodes (D10, D11), transformers (T1, T2), overcurrent resistors (R12, R16, R18, R19), high voltage capacitors (C13, C14, C15, C16), and rectifying diodes D32.
In one embodiment, referring to fig. 2, the gate of the switch Q4 is electrically connected to the transformer T2 (to obtain a switch signal), the drain of the switch Q4 is connected to the cathode of the clamp diode D11, the source of the switch Q4 is connected to one terminal 4 pin of the transformer T1, the anode of the clamp diode D11 is electrically connected to the 6 pin of the other terminal of the transformer T1, the gate of the switch Q3 is electrically connected to the transformer T2 (to obtain a switch signal), the drain of the switch Q3 is electrically connected to the 6 pin of the transformer T1, the cathode of the clamp diode D10 is connected to the source of the switch Q4, the anode of the clamp diode D10 is connected to the source of the switch Q3 via an overcurrent resistor (R18, R19), a high voltage capacitor (C13, C14) is connected between the source and the drain of the switch Q4, a peak (C16) is connected between the source and the drain of the switch Q3, the current is supplied to the drain of the switch Q16, the load is supplied to the switch Q3 via the anode of the switch Q3, the drain of the switch Q16 is connected to the rectifier circuit, and the load is supplied to the output of the transformer T1 via the switch Q16, and the drain of the switch Q1 is connected to the rectifier circuit via the drain of the switch Q16.
The transformer energy storage in the forward converting circuit without the reset circuit has a release loop, a reset circuit or a reset winding is not needed to be additionally arranged, when the switching tube is conducted, the transformer is excited, and when the switching tube is closed, two diodes on a bridge arm follow current, a magnetic core is demagnetized, and meanwhile, the energy of the magnetic core returns to a direct current power supply, the voltage born by a semiconductor device of a primary circuit of the transformer is equal to the input voltage of the converter, a single-tube forward requires a much higher withstand voltage device, and compared with the converter topology of other multiple tubes, the two switching tubes have no direct short circuit hazard, because the two switching tubes are on the diagonal line of the bridge, the two switching tubes are simultaneously turned on and off during normal operation, and the primary winding of the transformer bears the voltage at the moment, so the direct short circuit hazard is avoided
The forward converter circuit without the reset circuit overcomes the defect of high switch voltage stress in the forward converter, and can ensure reliable magnetic reset of the transformer without adopting a special reset circuit. More importantly, compared with a full-bridge converter or a half-bridge converter, each bridge arm of the full-bridge converter or the half-bridge converter is formed by connecting a diode and a switch tube in series, so that the full-bridge converter has the advantages of no bridge arm straight-through problem in structure and high reliability, and is one of the most obvious characteristics of a special forward converter without a reset circuit.
In all the active heat dissipation switch power supplies, a fan is generally used for heat dissipation to reduce the temperature of a power supply cavity. But the noise of the fan has a great influence on the working environment of the equipment. The fan is required to work in a controllable state to intelligently adjust the rotating speed of the fan according to the temperature in the power cavity, so that the best heat dissipation effect is achieved, the intelligent working mode can reduce the loss of the fan and prolong the service life of the fan, and therefore, the following technical scheme is adopted, and referring to fig. 3 specifically, the temperature control intelligent heat dissipation protection circuit comprises an NPN triode (Q200), a PNP triode (Q122), resistors (R205, R219, R220, R222, R223 and R224), a thermistor RTH3, a voltage stabilizing tube ZD200, an electrolytic capacitor (C201 and C221), a precise voltage stabilizing programmer AZ431 and the fan.
In one embodiment, one winding of the secondary of the transformer T1 is rectified and then connected to the collector of the NPN triode Q200, a resistor R205 is connected between the base and the collector of the NPN triode Q200, the base of the NPN triode Q200 is connected to the negative electrode (secondary ground) of the voltage regulator ZD200, the positive electrode of the electrolytic capacitor C201 is connected to the emitter of the NPN triode Q200, the negative electrode of the electrolytic capacitor C201 is grounded (secondary ground), the emitter of the NPN triode Q200 is connected to the emitter of the PNP triode Q122, the collector of the PNP triode Q122 is connected to the positive electrode of the electrolytic capacitor C221, the positive electrode of the electrolytic capacitor C221 is connected to the positive electrode of the fan, the base and the emitter of the PNP triode Q122 are connected to the resistor R222, the emitter of the PNP triode Q122 is connected to one end of the thermistor RTH3, the other end of the thermistor RTH3 is connected to the resistor R219, the other end of the resistor R219 is connected to the negative electrode of the precision voltage regulator IC3, the precision resistor IC3 is connected to the precision resistor IC3 through the first resistor R221 and the second resistor R3, and the precision resistor R221 is connected to the precision resistor D3 is connected to the precision resistor D, and the precision resistor D is connected to the precision resistor D3.
After the thermistor with a negative temperature coefficient is heated, the resistance value is reduced, the voltage of the power supply fan is accurately regulated by the precise voltage stabilizing programmer IC3, the conduction of the PNP triode Q122 is regulated, the power supply voltage of the fan is continuously changed along with the temperature of the detection cavity, when the temperature of the power supply cavity is low, the fan is not rotated, the voltage of the fan is intelligently regulated along with the continuous increase of heating, normal operation of components in the power supply is ensured, and the effect of temperature control intelligent heat dissipation protection is achieved.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.
Claims (5)
1. The utility model provides a forward 450W-600W switching power supply of no reset circuit, includes input rectifying filter circuit, output overvoltage protection circuit, output feedback circuit, power management control circuit, its characterized in that includes:
and the power management control circuit is electrically connected with a temperature control intelligent heat radiation protection circuit.
2. The forward 450W-600W switching power supply without reset circuit of claim 1, wherein: the forward converting circuit without the reset circuit comprises switching tubes (Q3 and Q4), clamping diodes (D10 and D11), transformers (T1 and T2), overcurrent resistors (R12, R16, R18 and R19), high-voltage capacitors (C13, C14, C15 and C16) and a rectifying diode D32.
3. The forward 450W-600W switching power supply without reset circuit of claim 2, wherein: the grid of the switch tube Q4 is electrically connected with the transformer T2, the drain electrode of the switch tube Q4 is connected to the cathode of the clamp diode D11, the source electrode of the switch tube Q4 is electrically connected with the transformer T1, the anode of the clamp diode D11 is electrically connected with the transformer T1, the grid of the switch tube Q3 is electrically connected with the transformer T2, the drain electrode of the switch tube Q3 is electrically connected with the transformer T1, the cathode of the clamp diode D10 is connected to the source electrode of the switch tube Q4, the anode of the clamp diode D10 is connected to the source electrode of the switch tube Q3 and is grounded through an overcurrent resistor (R18, R19), a high-voltage capacitor (C13, C14) is connected between the source electrode and the drain electrode of the switch tube Q3 in parallel, a high-voltage capacitor (C15, C16) is connected between the grid electrode and the source electrode of the switch tube Q4 in parallel, a overcurrent resistor R12 is connected between the grid electrode and the source electrode of the switch tube Q3 in parallel with the transformer T1, and the anode of the switch tube Q1 is connected with the output of the rectifier circuit T32.
4. A forward 450W-600W switching power supply without reset circuitry as claimed in claim 3 wherein: the temperature control intelligent heat radiation protection circuit comprises an NPN triode (Q200), a PNP triode (Q122), resistors (R205, R219, R220, R222, R223 and R224), a thermistor RTH3, a voltage stabilizing tube ZD200, an electrolytic capacitor (C201 and C221), a precise voltage stabilizing programmer AZ431 and a fan.
5. The forward 450W-600W switching power supply without reset circuit of claim 4, wherein: the collector of the NPN triode Q200 is electrically connected with the transformer T1, a resistor R205 is connected between the base and the collector of the NPN triode Q200, the base of the NPN triode Q200 is connected with the negative electrode of the voltage stabilizer ZD200, the positive electrode of the electrolytic capacitor C201 is connected to the emitter of the NPN triode Q200, the negative electrode of the electrolytic capacitor C201 is grounded, the emitter of the NPN triode Q200 is connected to the emitter of the PNP triode Q122, the collector of the PNP triode Q122 is connected with the positive electrode of the electrolytic capacitor C221, the positive electrode of the electrolytic capacitor C221 is connected with the positive electrode of the fan, the base and the emitter of the PNP triode Q122 are connected with a resistor R222, the emitter of the PNP triode Q122 is connected with one end of the thermistor RTH3, the other end of the thermistor RTH3 is connected with a resistor R219, the other end of the resistor R219 is connected with a pin of the precision programming IC3, the pin of the precision programming IC3 is connected with the secondary ground, the positive electrode of the precision programming IC 220 is connected with the precision programming resistor C221, and the precision programming IC 221 is connected with the precision programming resistor D3 through the precision programming resistor C221, and the precision programming resistor D of the precision programming resistor C221 is connected with the precision programming resistor D3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320209053.9U CN220043243U (en) | 2023-02-14 | 2023-02-14 | Forward 450W-600W switching power supply without reset circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320209053.9U CN220043243U (en) | 2023-02-14 | 2023-02-14 | Forward 450W-600W switching power supply without reset circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220043243U true CN220043243U (en) | 2023-11-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320209053.9U Active CN220043243U (en) | 2023-02-14 | 2023-02-14 | Forward 450W-600W switching power supply without reset circuit |
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| Country | Link |
|---|---|
| CN (1) | CN220043243U (en) |
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2023
- 2023-02-14 CN CN202320209053.9U patent/CN220043243U/en active Active
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