CN214100843U

CN214100843U - Direct-current power supply with protection function

Info

Publication number: CN214100843U
Application number: CN202023072468.1U
Authority: CN
Inventors: 王玉平
Original assignee: Shanghai Jingren Electronic Technology Co ltd
Current assignee: Shanghai Jingren Electronic Technology Co ltd
Priority date: 2020-12-18
Filing date: 2020-12-18
Publication date: 2021-08-31
Anticipated expiration: 2030-12-18

Abstract

The utility model discloses a DC power supply with protect function, including power transformer circuit, rectification filter circuit, adjustable voltage stabilizing circuit transships and short-circuit protection circuit, power transformer circuit passes through transformer W and changes 220V city voltage, and rectification filter circuit becomes smooth direct current with the alternating current is whole, and adjustable voltage stabilizing circuit makes output stabilizing voltage, and stabilizing voltage is adjustable in the certain limit, and overload and short-circuit protection circuit disconnection and auto-lock when being used for load short circuit and overload. The utility model discloses DC power supply with protect function adopts simple components and parts to constitute, and to steady voltage DC power supply, when transshipping and short circuit appear, the circuit can break off the power supply fast and the auto-lock, only need press button S2 after the trouble elimination can, the circuit is simple, easily realizes, safe and reliable, convenient and practical.

Description

Direct-current power supply with protection function

Technical Field

The utility model relates to a power technical field specifically is a DC power supply with protect function.

Background

Now, along with the rapid development of power supply technology, also gradual diversification to the demand of grid current, the efficiency of power is also being constantly improving the renewal, to the electronic equipment of different grade type, required power supply unit is also very different, electronic equipment can break down inevitably, when external equipment appears in proper order, the output of power can take place to transship and lead to power failure, the potential safety hazard takes place even, to powerful power, it is more dangerous, now, more protection on the market all is overcurrent, overvoltage under-voltage, protection such as overheat, and the components and parts that present overload and short-circuit protection adopted are more, the complexity is high, multi-purpose fuse protection, the trouble of changing the fuse has been increased.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a DC power supply with protect function to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

a direct current power supply with a protection function comprises a power supply transformation circuit, a rectification filter circuit, an adjustable voltage stabilizing circuit and an overload and short-circuit protection circuit, wherein the power supply transformation circuit changes 220V mains voltage through a transformer W, the rectification filter circuit rectifies alternating current into smooth direct current, the adjustable voltage stabilizing circuit enables the output of stable voltage to be adjustable within a certain range, and the overload and short-circuit protection circuit is used for circuit disconnection and self-locking during load short circuit and overload.

As a further technical solution of the present invention: one end of a primary winding of the transformer W is connected with 220V alternating current through a fuse FU1, the other end of the primary winding of the transformer W is connected with 220V alternating current through a starting switch S1, a secondary winding of the transformer W is connected with two input ports of a rectifier T, an output port 2 of the rectifier T is connected with the anode of a capacitor C1, the input ends of a capacitor C2 and a short-circuit protection circuit A1, the output end of a short-circuit protection circuit A1 is connected with the collector of a triode N3, a resistor R4, the collector of the triode N1 and the collector of a triode N2, a port 4 of the rectifier T is connected with the ground, the cathode of the capacitor C1, the other end of a capacitor C2, the cathode of a silicon controlled SCR, the anode of a voltage stabilizer IC, the cathode of the capacitor C3 and a resistor R7, the emitter of the triode N1 is connected with the resistor R1, the emitter of the triode N2, the resistor R2, one end of a potentiometer RW, the anode of the capacitor C4 and the anode of an output U, the base electrode of the triode N1 is connected with the other end of the resistor R1, the emitter electrode of the triode N3, the base electrode of the triode N2 and the other end of the resistor R2, the base electrode of the triode N3 is connected with the cathode of the voltage stabilizer IC, the other end of the resistor R4 and the resistor R5 through the resistor R3, the other end of the resistor R5 is connected with the anode of the silicon controlled rectifier SCR, the control electrode of the voltage stabilizer IC is connected with the positive electrode of the capacitor C3, the other end of the potentiometer RW and the resistor R6, and the other end of the resistor R6 is connected with the negative electrode of the capacitor C4, the other end of the resistor R7, the control electrode of the silicon controlled rectifier SCR and the negative electrode of the output U.

As a further technical solution of the present invention: the input end of the short-circuit protection circuit A1 is connected with the emitter of a triode P1, the anode of a capacitor C5, the anode of a capacitor C6, the emitter of a triode P1 and a resistor R11, the base of a triode P1 is connected with the cathode of a capacitor C5 and a resistor R8, the collector of a triode P1 is connected with a resistor R10, the cathode of a capacitor C6 and the base of a triode P2, the other end of the resistor R10 is connected with a resistor R9 and the ground end through the anode of a diode L1, the collector of a triode P2 is connected with the other end of the resistor R8, the output end of a key S2 and the output end of a short-circuit protection circuit A1, and the other end of the resistor R11 is connected with the other end of a key S2.

As a further technical solution of the present invention: the rectifier T and the filter capacitor C1 form a rectifying and filtering circuit, the triodes N1 and N2, the voltage stabilizer IC and the potentiometer RW form an adjustable voltage stabilizing circuit, and the triodes P1 and P2, the capacitors C5-C6 and the key S2 form an overload and short-circuit protection circuit.

As a further technical solution of the present invention: the capacitors C1, C3, C4, C5 and C6 are polar capacitors.

As a further technical solution of the present invention: the triodes N1, N2 and N3 are NPN triodes, and the triodes P1 and P2 are PNP triodes.

As a further technical solution of the present invention: the triode N1 and N2 form a regulating tube.

As a further technical solution of the present invention: TL431 is selected as the voltage stabilizer IC.

As a further technical solution of the present invention: the diode L1 is a light emitting diode, and the diode L1 emits a deep red light.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses DC power supply with protect function adopts simple components and parts to constitute, and to steady voltage DC power supply, when transshipping and short circuit appear, the circuit can break off the power supply fast and the auto-lock, only need press button S2 after the trouble elimination can, the circuit is simple, easily realizes, safe and reliable, convenient and practical.

Drawings

Fig. 1 is a schematic block diagram of the principle of the present invention.

Fig. 2 is a circuit diagram of the present invention.

Fig. 3 is a circuit diagram of the load and short-circuit protection circuit of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example 1: referring to fig. 1, a dc power supply with protection function includes a power transformer circuit, a rectifier filter circuit, an adjustable voltage regulator circuit, and an overload and short-circuit protection circuit, wherein the power transformer circuit changes a 220V mains voltage through a transformer W, the rectifier filter circuit regulates ac power into a smooth dc power, the adjustable voltage regulator circuit outputs a stable voltage, the stable voltage is adjustable within a certain range, and the overload and short-circuit protection circuit is used for circuit disconnection and self-locking during load short-circuit and overload.

Example 2: on the basis of embodiment 1, please refer to fig. 2-3, one end of the primary winding of the transformer W is connected to 220V ac through a fuse FU1, the other end of the primary winding of the transformer W is connected to 220V ac through a start switch S1, the secondary winding of the transformer W is connected to two input ports of the rectifier T, the output port 2 of the rectifier T is connected to the positive electrode of a capacitor C1, the capacitor C2 and the input end of a short-circuit protection circuit a1, the output end of the short-circuit protection circuit a1 is connected to the collector of a transistor N3, a resistor R4, the collector of the transistor N1 and the collector of a transistor N2, the port 4 of the rectifier T is connected to ground, the negative electrode of the capacitor C1, the other end of the capacitor C2, the cathode of a thyristor SCR, the anode of a regulator IC, the negative electrode of the capacitor C3 and a resistor R7, the emitter of the transistor N1 is connected to a resistor R1, the emitter of the transistor N2, the resistor R2, one end of a potentiometer RW, and the output end of the rectifier RW is connected to the output terminal of the capacitor C, The positive pole of a capacitor C4 and the positive pole of an output U, the base of a triode N1 is connected with the other end of a resistor R1, the emitter of a triode N3, the base of a triode N2 and the other end of a resistor R2, the base of a triode N3 is connected with the cathode of a voltage stabilizer IC, the other end of a resistor R4 and a resistor R5 through a resistor R3, the other end of a resistor R5 is connected with the anode of a silicon controlled rectifier SCR, the control pole of the voltage stabilizer IC is connected with the positive pole of a capacitor C3, the other end of a potentiometer RW and a resistor R6, the other end of a resistor R6 is connected with the negative pole of a capacitor C4, the other end of a resistor R7, the control pole of a silicon controlled rectifier SCR and the negative pole of an output U, wherein the input end of a short-circuit A1 is connected with the emitter of a triode P1, the positive pole of a capacitor C5, the emitter of a resistor P5 and the collector of a resistor R5, the base of a triode P5 is connected with the negative pole of a triode P5, The negative electrode of the capacitor C6 and the base electrode of the triode P2, the other end of the resistor R10 is connected with the resistor R9 and the ground end through the anode of the diode L1, the collector electrode of the triode P2 is connected with the other end of the resistor R8, the output end of the key S2 and the short-circuit protection circuit A1, and the other end of the resistor R11 is connected with the other end of the key S2.

The utility model discloses a theory of operation is: the circuit is powered on, when overload occurs, the voltage drop on the resistor R7 is increased, so that the SCR is switched on, the base electrode potential of the triode N3 is reduced, the triode N3 is cut off, the adjusting tubes N1 and N2 are cut off, the adjusting tubes are protected from being damaged due to overheating, when the load is in a short circuit condition, the SCR is immediately switched on, at the moment, the triode P1 is switched on, the collector electrode of the triode P2 is pulled down, the triode P2 is cut off and self-locked, the circuit is switched off, and when fault repair is completed, the circuit recovers work only by pressing the key S2.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention 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 description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. A direct current power supply with protection function comprises a power supply transformation circuit, a rectification filter circuit, an adjustable voltage stabilizing circuit and an overload and short-circuit protection circuit, and is characterized in that the power supply transformation circuit comprises a transformer W, one end of a primary winding of the transformer W is connected with 220V alternating current through a fuse FU1, the other end of the primary winding of the transformer W is connected with 220V alternating current through a starting switch S1, a secondary winding of the transformer W is connected with two input ports of a rectifier T, an output port 2 of the rectifier T is connected with an anode of a capacitor C1, a capacitor C2 and an input end of a short-circuit protection circuit A1, an output end of the short-circuit protection circuit A1 is connected with a collector of a triode N3, a resistor R4, a collector of the triode N1 and a collector of a triode N2, a port 4 of the rectifier T is connected with a ground, a cathode of the capacitor C1, the other end of the capacitor C2 and a cathode of a SCR, An anode of a voltage stabilizer IC, a cathode of a capacitor C3 and a resistor R7, an emitter of a triode N1 is connected with the resistor R1, an emitter of a triode N2, a resistor R2, one end of a potentiometer RW, an anode of a capacitor C4 and an anode of an output U, a base of the triode N1 is connected with the other end of the resistor R1, an emitter of a triode N3, a base of the triode N2 and the other end of the resistor R2, a base of the triode N3 is connected with a cathode of the voltage stabilizer IC, the other end of the resistor R4 and the resistor R5 through the resistor R3, the other end of the resistor R5 is connected with an anode of a silicon controlled rectifier SCR, a control electrode of the voltage stabilizer IC is connected with an anode of the capacitor C3, the other end of the potentiometer RW and the resistor R6, the other end of the resistor R6 is connected with a cathode of the capacitor C4, the other end of the resistor R7, a control electrode of the silicon controlled rectifier SCR and a cathode of the output U, wherein an input end of a short-circuit A1 is connected with an emitter of a triode P1 and an anode of a capacitor C5, The positive electrode of a capacitor C6, the emitting electrode of a triode P1 and a resistor R11, the base electrode of a triode P1 is connected with the negative electrode of a capacitor C5 and a resistor R8, the collector electrode of a triode P1 is connected with a resistor R10, the negative electrode of a capacitor C6 and the base electrode of a triode P2, the other end of the resistor R10 is connected with a resistor R9 and a ground end through the anode of a diode L1, the collector electrode of a triode P2 is connected with the other end of a resistor R8, the key S2 and the output end of a short-circuit protection circuit A1, and the other end of the resistor R11 is connected with the other end.

2. The DC power supply with protection function of claim 1, wherein the rectifier T and the filter capacitor C1 form a rectifying and filtering circuit, the transistors N1 and N2, the regulator IC and the potentiometer RW form an adjustable voltage regulator circuit, and the transistors P1 and P2, the capacitors C5-C6 and the button S2 form an overload and short-circuit protection circuit.

3. The direct current power supply with the protection function according to claim 1, wherein the capacitors C1, C3, C4, C5 and C6 are polar capacitors.

4. The dc power supply with protection function of claim 1, wherein the transistors N1, N2 and N3 are NPN transistors, and the transistors P1 and P2 are PNP transistors.

5. The DC power supply with protection function of claim 1, wherein the transistors N1 and N2 constitute a tuning transistor.

6. The dc power supply of claim 1, wherein the voltage regulator IC is TL 431.

7. The direct current power supply with protection function of claim 1, wherein the diode L1 is a light emitting diode, and the diode L1 emits deep red light.