CN209658987U - Low-voltage dc power supply with overvoltage protection - Google Patents

Low-voltage dc power supply with overvoltage protection Download PDF

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Publication number
CN209658987U
CN209658987U CN201920482780.6U CN201920482780U CN209658987U CN 209658987 U CN209658987 U CN 209658987U CN 201920482780 U CN201920482780 U CN 201920482780U CN 209658987 U CN209658987 U CN 209658987U
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China
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resistance
voltage
triode
connect
output
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CN201920482780.6U
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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 low-voltage dc power supply with overvoltage protection provided by the utility model, including rectification circuit, Overvoltage protecting unit, the first voltage regulator circuit, the second voltage regulator circuit and lithium battery;The input terminal of the rectification circuit is electrically connected with city; the output end of rectification circuit and the input terminal of Overvoltage protecting unit connect; the output end of the Overvoltage protecting unit is connect with the input terminal of the first voltage regulator circuit; the output end of first voltage regulator circuit is connect with the second voltage regulator circuit, and second voltage regulator circuit powers to the load;The realization three-level overvoltage protection under different fluctuation voltages can be realized in power supply process, so as to make the adaptable of entire DC power supply, safety is higher.

Description

Low-voltage dc power supply with overvoltage protection
Technical field
The utility model relates to a kind of power supply more particularly to a kind of low-voltage dc power supplies with overvoltage protection.
Background technique
Low-voltage dc power supply is widely used in production and living, such as LED desk lamp, mobile phone rechargeable lamp, existing low-pressure direct Galvanic electricity source is usually that 220V alternating current is converted into direct current by whole bridge rectifier circuit, is then carried out at corresponding voltage regulator circuit Reason, forms required direct current, such as LED street lamp, LED illuminating lamp for household use, host computer etc. and is required to above-mentioned treatment process, However, since alternating current fluctuates often in use so that the direct current of whole bridge rectifier circuit output also with And fluctuate, although having voltage regulator circuit, if mains fluctuation is larger and the line voltage long period is in one Kind overvoltage condition, then by causing irreversibility to damage orderly voltage regulator circuit and load etc., so that there are serious use Electric security risk, and the protection mechanism of existing low-voltage dc power supply is single, can not be adapted to wanting for different fluctuation voltages It asks, so that safety is low.
Utility model content
In view of this, the present invention provides a kind of low-voltage dc power supply with overvoltage protection, can power It is realized in journey and realizes three-level overvoltage protection under different fluctuation voltages, so as to make the adaptable of entire DC power supply, Safety is higher.
A kind of low-voltage dc power supply with overvoltage protection provided by the utility model, including rectification circuit, overvoltage protection Unit, the first voltage regulator circuit, the second voltage regulator circuit and lithium battery;
The input terminal of the rectification circuit is electrically connected with city, the output end of rectification circuit and the input terminal of Overvoltage protecting unit Connection, the output end of the Overvoltage protecting unit are connect with the input terminal of the first voltage regulator circuit, the output end of the first voltage regulator circuit It is connect with the second voltage regulator circuit, second voltage regulator circuit powers to the load;
The Overvoltage protecting unit includes switching output module, compares control module and overvoltage protective module;
The overvoltage protective module includes fuse F1, controllable silicon SCR 1, controllable silicon SCR 2, resistance R2, resistance R3, pressure-sensitive Resistance VR, resistance R4, resistance R5, voltage-stabiliser tube DW1 and relay;
One end of the fuse F1 is connected as the input terminal of overvoltage protective module and the output end of rectification circuit, insurance The other end of silk F1 and the input terminal of switching output module connect, and the output end of switching output module is defeated with the first voltage regulator circuit Enter end connection, the anode of the controllable silicon SCR 1 is connected to the points of common connection between fuse F1 and switching output module, institute The cathode ground connection of controllable silicon SCR 1 is stated, one end of varistor VR is connected to the anode of controllable silicon SCR 1, and varistor VR's is another One end is grounded by resistance R3, and the points of common connection between varistor VR and resistance R3 passes through resistance R2 and controllable silicon SCR 1 Control electrode connection, the points of common connection between varistor VR and resistance R3 is grounded by capacitor C1, one end of resistance R4 and can The anode connection of silicon SCR1 is controlled, the other end of resistance R4 is grounded by resistance R5, commonly connected between resistance R4 and resistance R5 Point is connect with the cathode of voltage-stabiliser tube DW1, and the anode of voltage-stabiliser tube DW1 is connect with the control electrode of controllable silicon SCR 2, controllable silicon SCR 2 Cathode is connected as the control output end of Overvoltage protecting unit and the control signal of switching output module, and controllable silicon SCR 2 is just Pole is connect by the normal open switch J-K of relay with the anode of controllable silicon SCR 1;
The points of common connection connection relatively between the input terminal and resistance R4 and resistance R5 of control module, the comparison Control module is used to control the on-off between the coil J1 of relay and power supply;
First voltage regulator circuit includes voltage-stabiliser tube DW2, voltage-stabiliser tube DW3, resistance R13, resistance R14, resistance R15, three poles Pipe Q4, triode Q5 and triode Q6;
The cathode of the voltage-stabiliser tube DW2 is connected to the input terminal of the first voltage regulator circuit, and the anode of voltage-stabiliser tube DW2 passes through resistance The anode of R15 ground connection, voltage-stabiliser tube DW2 is connect with the base stage of triode Q4, and the emitter of triode Q4 passes through resistance R13 and first The input terminal of voltage regulator circuit connects, and the collector of triode Q4 is connect with the base stage of triode Q5, and the collector of triode Q5 is logical It crosses resistance R14 to connect with the collector of triode Q6, the emitter of triode Q5 is connect with the base stage of triode Q6, triode Q6 Base stage connect with the cathode of voltage-stabiliser tube DW3, the plus earth of voltage-stabiliser tube DW3, the collector of triode Q6 is as the first pressure stabilizing The input terminal of circuit and the output end of switching output module connect, output of the emitter of triode Q6 as the first voltage regulator circuit End is connect with the input terminal of the second voltage regulator circuit;
The feeder ear of the lithium battery to compare control module and relay power supply.
Preferably, the switching output module 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, PMOS pipe Q2's It drains and is connect as the output end of switch output unit with the input terminal of the first voltage regulator circuit, the source electrode of the PMOS tube Q2 is logical It crosses resistance R7 to connect with the grid of PMOS tube Q2, the grid of PMOS tube Q2 is grounded by resistance R8, and the source electrode of PMOS tube Q2 passes through Capacitor C2 ground connection.
Preferably, the relatively control module 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;
Points of common connection connection between one end and resistance R4 and resistance R5 of the resistance R6, the other end of resistance R6 It is connect with the reverse side of comparator U1, one end of resistance R9 and the output end VCC connection of lithium battery, the other end of resistance R9 pass through Resistance R10 ground connection, the points of common connection between resistance R10 and resistance R9 are connect with the in-phase end of comparator U1, comparator U1's Output end is connect with the anode of the light emitting diode of optocoupler G1, the cathode ground connection of the light emitting diode of optocoupler G1, the light of optocoupler G1 The collector of quick triode meets the output end VCC of lithium battery by resistance R12, and the emitter of the phototriode of optocoupler G1 passes through The coil J1 of relay is grounded, and the output end of comparator U1 is connect by resistance R11 with the base stage of triode Q3, triode Q3's Emitter ground connection, the collector of triode Q3 and the control signal of single-chip microcontroller connect, the control output end of single-chip microcontroller and three poles The base stage of pipe Q1 connects, and the output end VCC connection of the collector and lithium battery of triode Q1, the emitter of triode Q1 passes through electricity R1 ground connection is hindered, the emitter of triode Q1 is connect with the anode of diode D1, the cathode of diode D1 and the control of controllable silicon SCR 1 Pole connection processed.
Preferably, the relatively control module 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, by Overvoltage protecting unit and the first voltage regulator circuit It works together and uses, realize the overvoltage protection of three different voltages ranks, so that entire DC power supply is adaptable, it is safe Property is higher, it is ensured that the Electrical 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 principles of the present invention block diagram.
Fig. 2 is the Overvoltage protecting unit of the utility model and the schematic diagram of the first voltage regulator circuit.
Specific embodiment
The utility model is made below in conjunction with Figure of description and being preferably described in detail, as shown in the figure: 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 low-voltage dc power supply with overvoltage protection provided by the utility model, including rectification circuit, overvoltage protection Unit, the first voltage regulator circuit, the second voltage regulator circuit and lithium battery;
The input terminal of the rectification circuit is electrically connected with city, the output end of rectification circuit and the input terminal of Overvoltage protecting unit Connection, the output end of the Overvoltage protecting unit are connect with the input terminal of the first voltage regulator circuit, the output end of the first voltage regulator circuit It is connect with the second voltage regulator circuit, second voltage regulator circuit powers to the load;
The Overvoltage protecting unit includes switching output module, compares control module and overvoltage protective module;
The overvoltage protective module includes fuse F1, controllable silicon SCR 1, controllable silicon SCR 2, resistance R2, resistance R3, pressure-sensitive Resistance VR, resistance R4, resistance R5, voltage-stabiliser tube DW1 and relay;
One end of the fuse F1 is connected as the input terminal of overvoltage protective module and the output end of rectification circuit, insurance The other end of silk F1 and the input terminal of switching output module connect, and the output end of switching output module is defeated with the first voltage regulator circuit Enter end connection, the anode of the controllable silicon SCR 1 is connected to the points of common connection between fuse F1 and switching output module, institute The cathode ground connection of controllable silicon SCR 1 is stated, one end of varistor VR is connected to the anode of controllable silicon SCR 1, and varistor VR's is another One end is grounded by resistance R3, and the points of common connection between varistor VR and resistance R3 passes through resistance R2 and controllable silicon SCR 1 Control electrode connection, the points of common connection between varistor VR and resistance R3 is grounded by capacitor C1, one end of resistance R4 and can The anode connection of silicon SCR1 is controlled, the other end of resistance R4 is grounded by resistance R5, commonly connected between resistance R4 and resistance R5 Point is connect with the cathode of voltage-stabiliser tube DW1, and the anode of voltage-stabiliser tube DW1 is connect with the control electrode of controllable silicon SCR 2, controllable silicon SCR 2 Cathode is connected as the control output end of Overvoltage protecting unit and the control signal of switching output module, and controllable silicon SCR 2 is just Pole is connect by the normal open switch J-K of relay with the anode of controllable silicon SCR 1;
The points of common connection connection relatively between the input terminal and resistance R4 and resistance R5 of control module, the comparison Control module is used to control the on-off between the coil J1 of relay and power supply;
First voltage regulator circuit includes voltage-stabiliser tube DW2, voltage-stabiliser tube DW3, resistance R13, resistance R14, resistance R15, three poles Pipe Q4, triode Q5 and triode Q6;
The cathode of the voltage-stabiliser tube DW2 is connected to the input terminal of the first voltage regulator circuit, and the anode of voltage-stabiliser tube DW2 passes through resistance The anode of R15 ground connection, voltage-stabiliser tube DW2 is connect with the base stage of triode Q4, and the emitter of triode Q4 passes through resistance R13 and first The input terminal of voltage regulator circuit connects, and the collector of triode Q4 is connect with the base stage of triode Q5, and the collector of triode Q5 is logical It crosses resistance R14 to connect with the collector of triode Q6, the emitter of triode Q5 is connect with the base stage of triode Q6, triode Q6 Base stage connect with the cathode of voltage-stabiliser tube DW3, the plus earth of voltage-stabiliser tube DW3, the collector of triode Q6 is as the first pressure stabilizing The input terminal of circuit and the output end of switching output module connect, output of the emitter of triode Q6 as the first voltage regulator circuit End is connect with the input terminal of the second voltage regulator circuit;
The feeder ear of the lithium battery to compare control module and relay power supply;Wherein, the conducting of voltage-stabiliser tube DW1 Voltage is greater than the conducting voltage of voltage-stabiliser tube DW2, and the conducting voltage of varistor VR is greater than the conducting voltage of voltage-stabiliser tube DW1;Its In, the conducting voltage of varistor VR is first threshold voltage, and the conducting voltage of voltage-stabiliser tube DW1 is second threshold voltage, pressure stabilizing The conducting voltage of pipe DW2 is third threshold voltage;When the voltage of rectification circuit output is less than third threshold voltage, PMOS tube Q2 Conducting, triode Q4 conducting, and then triode Q5 is connected, last triode Q6 conducting, due to triode Q6's and voltage-stabiliser tube DW3 Effect, thus to DC voltage carry out steady pressure treatment, and when rectification circuit output DC voltage be located at third threshold voltage and When between second threshold voltage, voltage-stabiliser tube DW2 conducting, triode Q4 cut-off, so that Q6 ends, thus will not be steady to second Volt circuit power supply, in this voltage range, the first voltage regulator circuit is able to bear, and will not cause to rush to Q6 to triode Q4 It hits;And when input voltage is between second threshold and first threshold, voltage-stabiliser tube DW1 conducting, silicon-controlled SRC2 conducting;And it is same When compare voltage that control module obtains between resistance R4 and resistance R5 and be greater than reference voltage, control relay obtains electric and makes The normal open switch J-K of relay is closed, to disconnect control command to switch output unit output, switch output unit, which disconnects, to be supplied Electricity;When the DC voltage of input is greater than first threshold voltage, i.e. varistor VR conducting, controllable silicon SCR 1 is connected at this time, this When high current flow through fuse F1, F1 fusing, to realize to subsequent circuit protection, wherein rectification circuit is using existing The whole bridge rectifier circuit being constituted by a diode, the second voltage regulator circuit use existing voltage stabilizing chip, such as LM7805 chip, LM2596 chip etc., lithium battery is for providing power supply VCC, using the existing lithium battery with charging control circuit, thus right The electricity of lithium battery is managed and controls lithium battery charging, wherein the charging input end of lithium battery and the second voltage regulator circuit Output end connection, the charging control circuit of lithium battery can be purchased directly from producer when purchasing lithium battery, belong to the prior art, Not in this to go forth.
In the present embodiment, the switching output module includes resistance R7, resistance R8, capacitor C2 and PMOS pipe Q2;
The source electrode of the PMOS tube Q2 is connect as the input terminal of switch output unit with fuse F1, PMOS pipe Q2's It drains and is connect as the output end of switch output unit with the input terminal of the first voltage regulator circuit, the source electrode of the PMOS tube Q2 is logical It crosses resistance R7 to connect with the grid of PMOS tube Q2, the grid of PMOS tube Q2 is grounded by resistance R8, and the source electrode of PMOS tube Q2 passes through Capacitor C2 ground connection, wherein capacitor C2 is for filtering and buffer function, and upon power-up, direct current first fills capacitor C2 Electricity is gradually increasing in the voltage of capacitor C2, and when the voltage at the both ends capacitor C2 is higher than the conducting voltage of PMOS tube Q2, i.e. PMOS The source voltage of pipe and the difference of grid voltage are greater than conducting voltage, and PMOS tube is connected at this time, to realize the guarantor to PMOS tube Shield, when the normal open switch J-K closure of the conducting of controllable silicon SCR 1 and relay, so that between the grid and source electrode of PMOS pipe Voltage is equal, so that PMOS tube turns off, disconnects subsequent power supply.
In the present embodiment, the relatively control module 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;
Points of common connection connection between one end and resistance R4 and resistance R5 of the resistance R6, the other end of resistance R6 It is connect with the reverse side of comparator U1, one end of resistance R9 and the output end VCC connection of lithium battery, the other end of resistance R9 pass through Resistance R10 ground connection, the points of common connection between resistance R10 and resistance R9 are connect with the in-phase end of comparator U1, comparator U1's Output end is connect with the anode of the light emitting diode of optocoupler G1, the cathode ground connection of the light emitting diode of optocoupler G1, the light of optocoupler G1 The collector of quick triode meets the output end VCC of lithium battery by resistance R12, and the emitter of the phototriode of optocoupler G1 passes through The coil J1 of relay is grounded, and the output end of comparator U1 is connect by resistance R11 with the base stage of triode Q3, triode Q3's Emitter ground connection, the collector of triode Q3 and the control signal of single-chip microcontroller connect, the control output end of single-chip microcontroller and three poles The base stage of pipe Q1 connects, and the output end VCC connection of the collector and lithium battery of triode Q1, the emitter of triode Q1 passes through electricity R1 ground connection is hindered, the emitter of triode Q1 is connect with the anode of diode D1, the cathode of diode D1 and the control of controllable silicon SCR 1 Pole connection processed;Wherein, single-chip microcontroller is equal using existing chip, such as 89S51 chip, VAR single-chip microcontroller or STM32 family chip Can, belong to the prior art, not in this to go forth;Comparator U1 exports low level when DC voltage is normal;Resistance R9 and electricity The value for hindering R10 carries out the setting of reference voltage, wherein the reference voltage is corresponding with the conducting voltage of voltage-stabiliser tube DW1, herein It is corresponding not be it is equal, due to resistance R6 current limliting partial pressure act on, the conducting voltage of voltage-stabiliser tube DW1 will not be equal to Therefore reference voltage between resistance R9 and resistance R10 is carried out corresponding by the value to resistance R10 and resistance 9 and resistance R6 Setting so that the reverse side voltage of comparator U1 is greater than in-phase end voltage when voltage-stabiliser tube DW1 is connected, at this point, comparator U1 exports high level, and 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 due to source voltage and grid voltage are equal by when the leading less than voltage-stabiliser tube DW1 of the voltage between resistance R4 and resistance R5 When the pressure that is powered, the reverse side voltage of comparator U1 is also lower than in-phase end voltage, at this point, comparator exports low level, light again Coupling G1 cut-off, relay alternating current, normal open switch J-K are disconnected, at this point, switch output unit powers to the load again;Single-chip microcontroller The terminal connecting with the collector of triode Q3 is set to high level when voltage is normal, single when comparator U1 exports high level Piece machine is pulled low with the triode Q3 terminal connecting, at this point, single-chip microcontroller starts timing, when the low level time of the terminal is more than to set When fixed time threshold, control triode Q1 conducting, although varistor VR is not turned at this time, the conducting of triode Q1, Controllable silicon SCR 1 can also be connected, to realize that fuse F1 fuses, power supply VCC among the above is using existing chargeable lithium electricity Pond provides.
In the present embodiment, the relatively control module 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 connection of rectification circuit and alternating current in time according to the prompt.

Claims (4)

1. a kind of low-voltage dc power supply with overvoltage protection, it is characterised in that: including rectification circuit, Overvoltage protecting unit, One voltage regulator circuit, the second voltage regulator circuit and lithium battery;
The input terminal of the rectification circuit is electrically connected with city, and the output end of rectification circuit and the input terminal of Overvoltage protecting unit connect Connect, the output end of the Overvoltage protecting unit is connect with the input terminal of the first voltage regulator circuit, the output end of the first voltage regulator circuit with The connection of second voltage regulator circuit, second voltage regulator circuit power to the load;
The Overvoltage protecting unit includes switching output module, compares control module and overvoltage protective module;
The overvoltage protective module includes fuse F1, controllable silicon SCR 1, controllable silicon SCR 2, resistance R2, resistance R3, varistor VR, resistance R4, resistance R5, voltage-stabiliser tube DW1 and relay;
One end of the fuse F1 is connected as the input terminal of overvoltage protective module and the output end of rectification circuit, fuse F1 The other end and switching output module input terminal connect, the input terminal of the output end of switching output module and the first voltage regulator circuit Connection, the anode of the controllable silicon SCR 1 are connected to the points of common connection between fuse F1 and switching output module, it is described can The cathode ground connection of silicon SCR1 is controlled, one end of varistor VR is connected to the anode of controllable silicon SCR 1, the other end of varistor VR It is grounded by resistance R3, the points of common connection between varistor VR and resistance R3 passes through the control of resistance R2 and controllable silicon SCR 1 Pole connection, the points of common connection between varistor VR and resistance R3 is grounded by capacitor C1, one end of resistance R4 with it is silicon-controlled The anode connection of SCR1, the other end of resistance R4 is grounded by resistance R5, the points of common connection between resistance R4 and resistance R5 and The cathode of voltage-stabiliser tube DW1 connects, and the anode of voltage-stabiliser tube DW1 is connect with the control electrode of controllable silicon SCR 2, the cathode of controllable silicon SCR 2 It is connected as the control output end of Overvoltage protecting unit and the control signal of switching output module, the anode of controllable silicon SCR 2 is logical The normal open switch J-K for crossing relay is connect with the anode of controllable silicon SCR 1;
The points of common connection connection relatively between the input terminal and resistance R4 and resistance R5 of control module, it is described relatively to control Module is used to control the on-off between the coil J1 of relay and power supply;
First voltage regulator circuit include voltage-stabiliser tube DW2, voltage-stabiliser tube DW3, resistance R13, resistance R14, resistance R15, triode Q4, Triode Q5 and triode Q6;
The cathode of the voltage-stabiliser tube DW2 is connected to the input terminal of the first voltage regulator circuit, and the anode of voltage-stabiliser tube DW2 passes through resistance R15 The anode of ground connection, voltage-stabiliser tube DW2 is connect with the base stage of triode Q4, and the emitter of triode Q4 is steady by resistance R13 and first The input terminal of volt circuit connects, and the collector of triode Q4 is connect with the base stage of triode Q5, and the collector of triode Q5 passes through Resistance R14 is connect with the collector of triode Q6, and the emitter of triode Q5 is connect with the base stage of triode Q6, triode Q6's Base stage is connect with the cathode of voltage-stabiliser tube DW3, the plus earth of voltage-stabiliser tube DW3, and the collector of triode Q6 is as the first pressure stabilizing electricity The input terminal on road and the output end of switching output module connect, output end of the emitter of triode Q6 as the first voltage regulator circuit It is connect with the input terminal of the second voltage regulator circuit;
The feeder ear of the lithium battery to compare control module and relay power supply.
2. according to claim 1 with the low-voltage dc power supply of overvoltage protection, it is characterised in that: the switching output module Including 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, and the drain electrode of PMOS tube Q2 is made It is connect to switch the output end of output unit with the input terminal of the first voltage regulator circuit, the source electrode of the PMOS tube Q2 passes through resistance R7 It is connect with the grid of PMOS tube Q2, the grid of PMOS tube Q2 is grounded by resistance R8, and the source electrode of PMOS tube Q2 is connect by capacitor C2 Ground.
3. according to claim 2 with the low-voltage dc power supply of overvoltage protection, it is characterised in that: the relatively control module Including resistance R6, resistance R1, triode Q1, diode D1, single-chip microcontroller, comparator U1, resistance R9, resistance R10, resistance R11, electricity Hinder 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 and the output end VCC connection of lithium battery, the other end of resistance R9 pass through resistance R10 ground connection, the points of common connection between resistance R10 and resistance R9 are connect with the in-phase end of comparator U1, the output of comparator U1 It holds and is connect with the anode of the light emitting diode of optocoupler G1, the cathode ground connection of the light emitting diode of optocoupler G1, photosensitive the three of optocoupler G1 The collector of pole pipe meets the output end VCC of lithium battery by resistance R12, and the emitter of the phototriode of optocoupler G1 passes through relay The coil J1 of device is grounded, and the output end of comparator U1 is connect by resistance R11 with the base stage of triode Q3, the transmitting of triode Q3 Pole ground connection, the collector of triode Q3 and the control signal of single-chip microcontroller connect, the control output end of single-chip microcontroller and triode Q1 Base stage connection, the output end VCC connection of the collector and lithium battery of triode Q1, the emitter of triode Q1 passes through resistance R1 Ground connection, the emitter of triode Q1 are connect with the anode of diode D1, the cathode of diode D1 and the control electrode of controllable silicon SCR 1 Connection.
4. according to claim 1 with the low-voltage dc power supply of overvoltage protection, it is characterised in that: the relatively control module It further include Light-emitting diode LED, the anode of Light-emitting diode LED connect with the emitter of the phototriode of optocoupler G1, shines The cathode of diode (LED) is grounded.
CN201920482780.6U 2019-04-11 2019-04-11 Low-voltage dc power supply with overvoltage protection Expired - Fee Related CN209658987U (en)

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CN201920482780.6U CN209658987U (en) 2019-04-11 2019-04-11 Low-voltage dc power supply with overvoltage protection

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Application Number Priority Date Filing Date Title
CN201920482780.6U CN209658987U (en) 2019-04-11 2019-04-11 Low-voltage dc power supply with overvoltage protection

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Publication Number Publication Date
CN209658987U true CN209658987U (en) 2019-11-19

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Granted publication date: 20191119

Termination date: 20200411