CN209562137U - Direct current supply over-pressure safety device - Google Patents

Direct current supply over-pressure safety device Download PDF

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Publication number
CN209562137U
CN209562137U CN201920482779.3U CN201920482779U CN209562137U CN 209562137 U CN209562137 U CN 209562137U CN 201920482779 U CN201920482779 U CN 201920482779U CN 209562137 U CN209562137 U CN 209562137U
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China
Prior art keywords
resistance
connect
controllable silicon
silicon scr
triode
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Expired - Fee Related
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CN201920482779.3U
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Chinese (zh)
Inventor
倪元敏
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Chongqing Industry Polytechnic College
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Chongqing Industry Polytechnic College
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Abstract

A kind of direct current supply over-pressure safety device provided by the utility model, including switch output unit, comparison control circuit and Overvoltage protecting unit;The Overvoltage protecting unit includes fuse F1, controllable silicon SCR 1, controllable silicon SCR 2, resistance R2, resistance R3, varistor VR, resistance R4, resistance R5, Zener diode DW1 and relay;Points of common connection connection between the input terminal and resistance R4 and resistance R5 of the comparison control circuit, the comparison control circuit are used to control the on-off between the coil J1 of relay and power supply;Can accurately be detected when powering to direct-flow electricity utilization apparatus DC voltage whether over-voltage, and two class protection is carried out in over-voltage, so as to effectively ensure the safety of electrical equipment.

Description

Direct current supply over-pressure safety device
Technical field
The utility model relates to a kind of electric protection device more particularly to a kind of direct current supply over-pressure safety devices.
Background technique
In existing direct-flow electricity utilization apparatus, 220V alternating current is usually converted into direct current by whole bridge rectifier circuit, Then corresponding voltage regulator circuit processing is carried out, required direct current, such as LED street lamp, LED illuminating lamp for household use, computer master are formed Machine etc. is required to above-mentioned treatment process, however, since alternating current fluctuates often in use, so that full-bridge type Rectification circuit output direct current also therewith fluctuate, although have voltage regulator circuit, if mains fluctuation it is larger with And the line voltage long period is in a kind of overvoltage condition, then will be caused to orderly voltage regulator circuit and load etc. irreversible Property damage, so that there are serious Electrical Safety hidden danger, although having overvoltage crowbar in the prior art, its function list One.
Utility model content
Therefore, the purpose of the utility model is to provide a kind of direct current supply over-pressure safety device, to direct-flow electricity utilization apparatus Can accurately be detected when power supply DC voltage whether over-voltage, and two class protection is carried out in over-voltage, so as to effectively really The safety for electric equipment of guaranteeing.
A kind of direct current supply over-pressure safety device provided by the utility model, including switch output unit, compare control electricity Road and Overvoltage protecting unit;
The Overvoltage protecting unit includes fuse F1, controllable silicon SCR 1, controllable silicon SCR 2, resistance R2, resistance R3, pressure-sensitive Resistance VR, resistance R4, resistance R5, Zener diode DW1 and relay;
One end of the fuse F1 is connect as the input terminal of Overvoltage protecting unit with DC power supply, and fuse F1's is another One end is connect with the input terminal of switch output unit, and the output end and load for switching output unit connect, the controllable silicon SCR 1 Anode be connected to fuse F1 and switch output unit between points of common connection, the controllable silicon SCR 1 cathode ground connection, One end of varistor VR is connected to the anode of controllable silicon SCR 1, and the other end of varistor VR is grounded by resistance R3, pressure-sensitive Points of common connection between resistance VR and resistance R3 is connect by resistance R2 with the control electrode of controllable silicon SCR 1, varistor VR and Points of common connection between resistance R3 is grounded by capacitor C1, and one end of resistance R4 is connect with the anode of controllable silicon SCR 1, resistance The other end of R4 is grounded by resistance R5, the cathode of the points of common connection between resistance R4 and resistance R5 and Zener diode DW1 The anode of connection, Zener diode DW1 is connect with the control electrode of controllable silicon SCR 2, and the cathode of controllable silicon SCR 2 is as overvoltage protection The control output end of unit is connect with the control signal of switch output unit, and the anode of controllable silicon SCR 2 passes through the normal of relay Switch J-K is connect with the anode of controllable silicon SCR 1;
Points of common connection connection between the input terminal and resistance R4 and resistance R5 of the comparison control circuit, the comparison Control circuit is used to control the on-off between the coil J1 of relay and power supply.
Preferably, the switch output unit includes resistance R7, resistance R8, capacitor C2 and PMOS tube Q2;
The source electrode of the PMOS tube Q2 is connect as the input terminal of switch output unit with fuse F1, the leakage of PMOS tube Q2 Pole is connected as the output end of switch output unit and load, and the source electrode of the PMOS tube Q2 passes through resistance R7's and PMOS tube Q2 Grid connection, the grid of PMOS tube Q2 are grounded by resistance R8, and the source electrode of PMOS tube Q2 is grounded by capacitor C2.
Preferably, the comparison control circuit includes resistance R6, resistance R1, triode Q1, diode D1, single-chip microcontroller, ratio Compared with device U1, resistance R9, resistance R10, resistance R11, resistance R12, triode Q3 and optocoupler G1;
Between one end and resistance R4 and resistance R5 of the resistance R6 points of common connection connection, the other end of resistance R6 with The reverse side of comparator U1 connects, and one end of resistance R9 is connect with power supply VCC, and the other end of resistance R9 is grounded by resistance R10, Points of common connection between resistance R10 and resistance R9 is connect with the in-phase end of comparator U1, the output end and optocoupler of comparator U1 The anode connection of the light emitting diode of G1, the cathode ground connection of the light emitting diode of optocoupler G1, the collection of the phototriode of optocoupler G1 Electrode meets power supply VCC by resistance R12, and the emitter of the phototriode of optocoupler G1 is grounded by the coil J1 of relay, than Output end compared with device U1 is connect by resistance R11 with the base stage of triode Q3, the emitter ground connection of triode Q3, triode Q3's The connection of the control signal of collector and single-chip microcontroller, the control output end of single-chip microcontroller are connect with the base stage of triode Q1, triode The collector of Q1 is connect with power supply VCC, and the emitter of triode Q1 is grounded by resistance R1, the emitter of triode Q1 and two poles The anode connection of pipe D1, the cathode of diode D1 are connect with the control electrode of controllable silicon SCR 1.
Preferably, the comparison control circuit further includes Light-emitting diode LED, the anode and optocoupler of Light-emitting diode LED The emitter of the phototriode of G1 connects, the cathode ground connection of Light-emitting diode LED.
The utility model has the beneficial effects that by the utility model, when DC voltage is higher than first order threshold voltage, by Overvoltage protecting unit exports control command to switch output unit, and control switch output unit disconnects the company between power supply and load It connects, fuse protection is then realized when DC voltage is higher than second threshold voltage, so as to accurately whether detect DC voltage Over-voltage, and two class protection is carried out in over-voltage, so as to effectively ensure the safety of electrical equipment.
Detailed description of the invention
With reference to the accompanying drawings and examples the utility model is made preferably to describe:
Fig. 1 is the structural schematic diagram block diagram of the utility model.
Fig. 2 is the circuit diagram of the utility model.
Specific embodiment
The utility model is made below in conjunction with Figure of description and being preferably described in detail, as shown, the reality in following Example is applied to be merely intended for describing the technical solutions of the present application, but not for limiting the present application, it is all to modify to the technical solution of the utility model Or equivalent replacement should all cover without departing from the objective and range of technical solutions of the utility model in the utility model In scope of the claims.
A kind of direct current supply over-pressure safety device provided by the utility model, including switch output unit, compare control electricity Road and Overvoltage protecting unit;
The Overvoltage protecting unit includes fuse F1, controllable silicon SCR 1, controllable silicon SCR 2, resistance R2, resistance R3, pressure-sensitive Resistance VR, resistance R4, resistance R5, Zener diode DW1 and relay;
One end of the fuse F1 is connect as the input terminal of Overvoltage protecting unit with DC power supply, and fuse F1's is another One end is connect with the input terminal of switch output unit, and the output end and load for switching output unit connect, the controllable silicon SCR 1 Anode be connected to fuse F1 and switch output unit between points of common connection, the controllable silicon SCR 1 cathode ground connection, One end of varistor VR is connected to the anode of controllable silicon SCR 1, and the other end of varistor VR is grounded by resistance R3, pressure-sensitive Points of common connection between resistance VR and resistance R3 is connect by resistance R2 with the control electrode of controllable silicon SCR 1, varistor VR and Points of common connection between resistance R3 is grounded by capacitor C1, wherein capacitor C1 is for filtering out alternating component, one end of resistance R4 It is connect with the anode of controllable silicon SCR 1, the other end of resistance R4 is grounded by resistance R5, public between resistance R4 and resistance R5 Tie point is connect with the cathode of Zener diode DW1, and the anode of Zener diode DW1 is connect with the control electrode of controllable silicon SCR 2, The cathode of controllable silicon SCR 2 is connect as the control output end of Overvoltage protecting unit with the control signal of switch output unit, can The anode of control silicon SCR2 is connect by the normal open switch J-K of relay with the anode of controllable silicon SCR 1;
Points of common connection connection between the input terminal and resistance R4 and resistance R5 of the comparison control circuit, the comparison Control circuit is used to control the on-off between the coil J1 of relay and power supply;Wherein second threshold voltage is leading for varistor Be powered pressure, and first threshold voltage is the conducting voltage of Zener diode DW1, wherein first threshold voltage is less than second threshold electricity Pressure;When the DC voltage of input is less than first threshold voltage, switch output unit normally exports direct current to load, works as resistance When the voltage that R4 and resistance R5 are detected is greater than first threshold voltage and is less than second threshold voltage, then Zener diode DW1 is led It is logical, silicon-controlled SRC2 conducting;And voltage that comparison control circuit obtains between resistance R4 and resistance R5 is greater than benchmark electricity simultaneously Pressure, control relay obtain normal open switch that is electric and making relay and are closed, so that control command is disconnected to switch output unit output, It switchs output unit and disconnects power supply;When the DC voltage of input is greater than second threshold voltage, i.e. varistor VR conducting, at this time Controllable silicon SCR 1 is connected, and high current flows through fuse F1, F1 fusing, to realize to subsequent circuit protection, by upper at this time The structure stated, so as to accurately detect DC voltage whether over-voltage, and two class protection is carried out in over-voltage, so as to Effectively ensure the safety of electrical equipment;Load among the above includes the electricity such as voltage regulator circuit, electrical equipment after switch output unit Road.
In the present embodiment, the switch output unit includes resistance R7, resistance R8, capacitor C2 and PMOS tube Q2;
The source electrode of the PMOS tube Q2 is connect as the input terminal of switch output unit with fuse F1, the leakage of PMOS tube Q2 Pole is connected as the output end of switch output unit and load, and the source electrode of the PMOS tube Q2 passes through resistance R7's and PMOS tube Q2 Grid connection, the grid of PMOS tube Q2 are grounded by resistance R8, and the source electrode of PMOS tube Q2 is grounded by capacitor C2, wherein capacitor C2 for filter and buffer function, upon power-up, direct current first charges to capacitor C2, capacitor C2 voltage gradually Rise, and when the voltage at the both ends capacitor C2 is higher than the conducting voltage of PMOS tube Q2, i.e. source voltage Yu the grid electricity of PMOS tube The difference of pressure is greater than conducting voltage, and PMOS tube is connected at this time, to realize protection to PMOS tube, when the conducting of controllable silicon SCR 1 and When the normal open switch J-K closure of relay, so that the voltage between the grid and source electrode of PMOS tube is equal, so that PMOS tube Shutdown, disconnects subsequent power supply.
In the present embodiment, the comparison control circuit includes resistance R6, resistance R1, triode Q1, diode D1, monolithic Machine, comparator U1, resistance R9, resistance R10, resistance R11, resistance R12, triode Q3 and optocoupler G1;
Between one end and resistance R4 and resistance R5 of the resistance R6 points of common connection connection, the other end of resistance R6 with The reverse side of comparator U1 connects, and one end of resistance R9 is connect with power supply VCC, and the other end of resistance R9 is grounded by resistance R10, Points of common connection between resistance R10 and resistance R9 is connect with the in-phase end of comparator U1, the output end and optocoupler of comparator U1 The anode connection of the light emitting diode of G1, the cathode ground connection of the light emitting diode of optocoupler G1, the collection of the phototriode of optocoupler G1 Electrode meets power supply VCC by resistance R12, and the emitter of the phototriode of optocoupler G1 is grounded by the coil J1 of relay, than Output end compared with device U1 is connect by resistance R11 with the base stage of triode Q3, the emitter ground connection of triode Q3, triode Q3's The connection of the control signal of collector and single-chip microcontroller, the control output end of single-chip microcontroller are connect with the base stage of triode Q1, triode The collector of Q1 is connect with power supply VCC, and the emitter of triode Q1 is grounded by resistance R1, the emitter of triode Q1 and two poles The anode connection of pipe D1, the cathode of diode D1 are connect with the control electrode of controllable silicon SCR 1, wherein single-chip microcontroller uses existing core Piece, such as 89S51 chip, VAR single-chip microcontroller or STM32 family chip, belong to the prior art, not in this to go forth; Comparator U1 exports low level when DC voltage is normal;The value of resistance R9 and resistance R10 carry out the setting of reference voltage, In, the reference voltage is corresponding with the conducting voltage of Zener diode DW1, herein it is corresponding not be it is equal, due to resistance The current limliting partial pressure of R6 acts on, and therefore, the conducting voltage of Zener diode DW1 will not be equal to the base between resistance R9 and resistance R10 Therefore quasi- voltage is set, so that Zener diode accordingly by the value to resistance R10 and resistance 9 and resistance R6 The reverse side voltage of comparator U1 is greater than in-phase end voltage when DW1 is connected, at this point, comparator U1 exports high level, optocoupler G1 conducting, the coil J1 of relay obtains electric so that normal open switch J-K is closed, so that PMOS tube Q2 is because of source voltage and grid Voltage it is equal and by, when the voltage between resistance R4 and resistance R5 be less than Zener diode DW1 conducting voltage when, comparator The reverse side voltage of U1 is also lower than in-phase end voltage, at this point, comparator exports low level, optocoupler G1 cut-off, relay again Alternating current, normal open switch J-K are disconnected, at this point, switch output unit powers to the load again;The current collection of single-chip microcontroller and triode Q3 The terminal of pole connection is set to high level when voltage is normal, and when comparator U1 exports high level, single-chip microcontroller and triode Q3 connect The terminal connect is pulled low, at this point, single-chip microcontroller starts timing, when the low level time of the terminal is more than the time threshold of setting, Triode Q1 conducting is controlled, although varistor VR is not turned at this time, the conducting of triode Q1 can also make controllable silicon SCR 1 Conducting, to realize that fuse F1 fuses, power supply VCC among the above is provided using existing rechargeable lithium battery.
In the present embodiment, the comparison control circuit further includes Light-emitting diode LED, the anode of Light-emitting diode LED with The emitter of the phototriode of optocoupler G1 connects, the cathode ground connection of Light-emitting diode LED, wherein Light-emitting diode LED is used for PMOS tube is ended and powers off and indicates, user can disconnect and the front-end circuit of fuse F1 and city in time according to the prompt The connection of electricity.

Claims (4)

1. a kind of direct current supply over-pressure safety device, it is characterised in that: including switch output unit, comparison control circuit and mistake Press protection location;
The Overvoltage protecting unit includes fuse F1, controllable silicon SCR 1, controllable silicon SCR 2, resistance R2, resistance R3, varistor VR, resistance R4, resistance R5, Zener diode DW1 and relay;
One end of the fuse F1 is connect as the input terminal of Overvoltage protecting unit with DC power supply, the other end of fuse F1 It is connect with the input terminal of switch output unit, the output end and load for switching output unit connect, and the controllable silicon SCR 1 is just Pole is connected to fuse F1 and switchs the points of common connection between output unit, the cathode ground connection of the controllable silicon SCR 1, pressure-sensitive One end of resistance VR is connected to the anode of controllable silicon SCR 1, and the other end of varistor VR is grounded by resistance R3, varistor Points of common connection between VR and resistance R3 is connect by resistance R2 with the control electrode of controllable silicon SCR 1, varistor VR and resistance Points of common connection between R3 is grounded by capacitor C1, and one end of resistance R4 is connect with the anode of controllable silicon SCR 1, resistance R4's The other end is grounded by resistance R5, and the points of common connection between resistance R4 and resistance R5 is connect with the cathode of Zener diode DW1, The anode of Zener diode DW1 is connect with the control electrode of controllable silicon SCR 2, and the cathode of controllable silicon SCR 2 is as Overvoltage protecting unit Control output end connect with the control signal of switch output unit, the anode of controllable silicon SCR 2 passes through the normally opened of relay and opens J-K is closed to connect with the anode of controllable silicon SCR 1;
Points of common connection connection between the input terminal and resistance R4 and resistance R5 of the comparison control circuit, it is described relatively to control Circuit is used to control the on-off between the coil J1 of relay and power supply.
2. direct current supply over-pressure safety device according to claim 1, it is characterised in that: the switch output unit includes electricity Hinder R7, resistance R8, capacitor C2 and PMOS tube Q2;
The source electrode of the PMOS tube Q2 is connect as the input terminal of switch output unit with fuse F1, and the drain electrode of PMOS tube Q2 is made It is connected to switch output end and the load of output unit, the source electrode of the PMOS tube Q2 passes through the grid of resistance R7 and PMOS tube Q2 Connection, the grid of PMOS tube Q2 are grounded by resistance R8, and the source electrode of PMOS tube Q2 is grounded by capacitor C2.
3. direct current supply over-pressure safety device according to claim 1, it is characterised in that: the comparison control circuit includes electricity Hinder R6, resistance R1, triode Q1, diode D1, single-chip microcontroller, comparator U1, resistance R9, resistance R10, resistance R11, resistance R12, Triode Q3 and optocoupler G1;
Points of common connection connection between one end and resistance R4 and resistance R5 of the resistance R6, the other end of resistance R6 is compared with The reverse side of device U1 connects, and one end of resistance R9 is connect with power supply VCC, and the other end of resistance R9 is grounded by resistance R10, resistance Points of common connection between R10 and resistance R9 is connect with the in-phase end of comparator U1, and the output end of comparator U1 is with optocoupler G1's The anode connection of light emitting diode, the cathode ground connection of the light emitting diode of optocoupler G1, the collector of the phototriode of optocoupler G1 Power supply VCC is met by resistance R12, the emitter of the phototriode of optocoupler G1 is grounded by the coil J1 of relay, comparator The output end of U1 is connect by resistance R11 with the base stage of triode Q3, the emitter ground connection of triode Q3, the current collection of triode Q3 The connection of the control signal of pole and single-chip microcontroller, the control output end of single-chip microcontroller are connect with the base stage of triode Q1, triode Q1's Collector is connect with power supply VCC, and the emitter of triode Q1 is grounded by resistance R1, the emitter and diode D1 of triode Q1 Anode connection, the cathode of diode D1 connect with the control electrode of controllable silicon SCR 1.
4. direct current supply over-pressure safety device according to claim 3, it is characterised in that: the comparison control circuit further includes The anode of Light-emitting diode LED, Light-emitting diode LED is connect with the emitter of the phototriode of optocoupler G1, light emitting diode The cathode of LED is grounded.
CN201920482779.3U 2019-04-11 2019-04-11 Direct current supply over-pressure safety device Expired - Fee Related CN209562137U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201920482779.3U CN209562137U (en) 2019-04-11 2019-04-11 Direct current supply over-pressure safety device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201920482779.3U CN209562137U (en) 2019-04-11 2019-04-11 Direct current supply over-pressure safety device

Publications (1)

Publication Number Publication Date
CN209562137U true CN209562137U (en) 2019-10-29

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201920482779.3U Expired - Fee Related CN209562137U (en) 2019-04-11 2019-04-11 Direct current supply over-pressure safety device

Country Status (1)

Country Link
CN (1) CN209562137U (en)

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GR01 Patent grant
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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20191029

Termination date: 20200411

CF01 Termination of patent right due to non-payment of annual fee