CN202712814U - Shutdown output over-voltage and under-voltage protection circuit - Google Patents
Shutdown output over-voltage and under-voltage protection circuit Download PDFInfo
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- CN202712814U CN202712814U CN 201220218293 CN201220218293U CN202712814U CN 202712814 U CN202712814 U CN 202712814U CN 201220218293 CN201220218293 CN 201220218293 CN 201220218293 U CN201220218293 U CN 201220218293U CN 202712814 U CN202712814 U CN 202712814U
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Abstract
The utility model introduces a shutdown output over-voltage and under-voltage protection circuit. A sampling circuit carries out sampling on an output voltage of a power supply module, and then is connected with a voltage monitoring circuit. The voltage monitoring circuit monitors the input sampling voltage, and then outputs a high level or a low level and carries out transmission to a control circuit through an isolation circuit. The control circuit controls the on or off of a silicon-controlled rectifier to protect the power supply module. When a photoelectric transistor in the isolation circuit is switched on, the silicon-controlled rectifier is switched off, a control terminal of the power supply module is suspended, and the output of the power supply module is normal. When the photoelectric transistor in the isolation circuit is switched off, the silicon-controlled rectifier is switched on, the control terminal of the power supply module is pulled down, and the power supply module is shut down. According to the shutdown output over-voltage and under-voltage protection circuit, a protection point can be accurately set according to requirements; and when the shutdown output over-voltage and under-voltage protection circuit detects that the voltage exceeds the set range, shutdown protection can be immediately carried out.
Description
Technical field
The utility model relates to a kind of power technology, particularly a kind of shutoff formula output over under-voltage protection circuit.
Background technology
In recent years, because small size, high power density, the high efficiency, highly reliable of switch power module, the various DC/DC power modules that make have obtained fast development and extensive use.In the application process of power module; because the power module of a lot of manufacturers does not possess output overcurrent defencive function or short-circuit protection function, cause having occurred owing to the various factorss such as long-time overcurrent or short circuit cause the power module output voltage unusually to cause module damage or protection point not accurately not to reach desired value.Cause the power module fault for fear of long-time output overcurrent or short circuit etc., protect therefore many times need to the power cutoff module occur when unusual immediately at the power module output voltage.
Summary of the invention
Technical problem to be solved in the utility model provides a kind of shutoff formula output over under-voltage protection circuit, overcomes can not the shutoff formula protecting of existing power module; For the shutoff formula over under-voltage protection circuit of the power module with switch control terminal, and the protection point can be set accurately; Can realize after detection voltage exceeds setting range, can carrying out immediately the protection of shutoff formula.
For the purpose that realizes solving the problems of the technologies described above, the utility model has adopted following technical scheme:
Shutoff formula output over under-voltage protection circuit of the present utility model, comprise sample circuit, voltage monitoring circuit, buffer circuit, control circuit, power module output plus terminal, power module output ground, the auxiliary anode of input, input ground and switch of the power supply module control terminal;
Described power module refers to have the power module of switch control terminal, and its control logic is defined as: high level or when unsettled power module output is arranged, low level or power module no-output during with input ground short circuit;
Sample circuit is the universal circuit with voltage sample function, is provided with input port and output port.Input port connects power module output plus terminal and output ground; Output port connects the input port of voltage monitoring circuit;
Voltage monitoring circuit is to have the universal circuit that input signal and built-in reference voltage is compared, then exports high level or low-level functionality, is provided with input port, output port and power port; Input port connects the output port of sample circuit; Output port connects the input port of buffer circuit; Power port connects power module output plus terminal and output ground;
Buffer circuit is the universal circuit that has input signal and output signal isolation features, comprises a light-emitting diode and a phototransistor; The anode of light-emitting diode connects the output of voltage monitor in the voltage monitoring circuit; The negative electrode of light-emitting diode connects output ground; Two terminals of photoelectric crystal are connected to the input port of control circuit; When voltage monitor output high level, the light-emitting diode conducting, phototransistor is conducting also; When the voltage monitor output low level, not conducting of light-emitting diode, phototransistor cut-off;
Control circuit is to have the universal circuit of controlling silicon controlled conducting or cutoff function according to input signal, is provided with input port and output port; Input port connects the output port of buffer circuit; Output port connects and connects respectively the auxiliary anode of input, input ground, switch of the power supply module control terminal.
Further concrete, described sample circuit is sampled to the output voltage of power module, then sampled voltage is connected to voltage monitoring circuit; Sample circuit comprises: the first resistance, the second resistance and the 3rd resistance.One end of the first resistance links to each other with the output plus terminal of power module; The other end of the first resistance is connected successively by being connected with output ground behind the second resistance, the 3rd resistance; Wherein the tie point of the first resistance and the second resistance is under-voltage sampled point; The tie point of the second resistance and the 3rd resistance is the overvoltage sampled point.By in sample circuit, choosing suitable sample resistance, can arrange accurately under-voltage or over-voltage protection point.
Further concrete, described voltage monitoring circuit monitors the sampled voltage of input, namely by comparing with the built-in reference voltage of voltage monitor, then exports high level or low level to buffer circuit; When the output voltage of power module is normal, voltage monitor output high level; When the output voltage of power module is unusual, i.e. during under-voltage or overvoltage, the voltage monitor output low level; Voltage monitoring circuit comprises a voltage monitor and the 4th resistance; Voltage monitor is the monitoring voltage chip, and it comprises two relatively passage and two collector electrode outputs, and is built-in with reference voltage; Voltage monitor comprises 8 pins: 8 pin are feeder ear, and 4 pin are power supply ground; 2 pin and 3 pin are input; 5 pin and 6 pin are output; 1 pin and the general short circuit of 7 pin; 2 pin of voltage monitor are connected with under-voltage sampled point in the sample circuit; 3 pin of voltage monitor are connected with overvoltage sampled point in the sample circuit; 8 pin of voltage monitor and power module output plus terminal short circuit; 4 pin of voltage monitor and output ground short circuit; Be connected to buffer circuit behind 5 pin of voltage monitor and the 6 pin short circuits; 8 pin of one termination voltage monitor of the 4th resistance, 5 pin of another termination voltage monitor and 6 pin.
Further concrete, described buffer circuit is transferred to control circuit with the output signal isolation of voltage monitoring circuit; Buffer circuit comprises a photoelectrical coupler, and this photoelectrical coupler comprises a light-emitting diode and a phototransistor; The anode of light-emitting diode connects 5 pin and 6 pin of voltage monitor in the voltage monitoring circuit; The negative electrode of light-emitting diode connects output ground; Two terminals of phototransistor are connected to control circuit.When voltage monitor output high level, the light-emitting diode conducting, phototransistor is conducting also; When the voltage monitor output low level, not conducting of light-emitting diode, phototransistor cut-off.
Further concrete, then described control circuit is controlled the silicon controlled conducting or is ended to come the protection power source module by accepting the signal of buffer circuit.Control circuit comprises: the 5th resistance, the 6th resistance, the 7th resistance, an electric capacity, a voltage-stabiliser tube, a controllable silicon, a diode; The anodic bonding of silicon controlled trigger electrode and voltage-stabiliser tube wherein; The negative electrode of voltage-stabiliser tube is connected with the collector electrode of phototransistor in the buffer circuit, connects input ground by the 6th resistance simultaneously; The negative electrode of voltage-stabiliser tube is connected by the auxiliary anode of the 5th resistance and input in addition; The positive pole of electric capacity is connected with the negative electrode of voltage-stabiliser tube, and the negative pole of electric capacity connects input ground; The emitter of phototransistor connects input ground in the buffer circuit; The silicon controlled anode is connected by the auxiliary anode of the 7th resistance and input, is connected with the control terminal of power module by diode simultaneously; Controllable silicon is one-way SCR, and the silicon controlled negative electrode connects input ground.When the phototransistor conducting in the buffer circuit, the controllable silicon cut-off, the control terminal of power module is unsettled, and power module output is normal; When the phototransistor in the buffer circuit ends, controlled silicon conducting, the control terminal of power module is dragged down, and power module is turned off.
The sample circuit of this patent, voltage monitoring circuit, buffer circuit, control circuit all have prior art, as long as can finish corresponding function.
The shutoff formula over under-voltage protection circuit of this patent, its specific works principle is: sample circuit is sampled to the output voltage of power module, then sampled voltage is connected to voltage monitoring circuit.By in sample circuit, choosing suitable sample resistance, can arrange accurately under-voltage or over-voltage protection point.Voltage monitoring circuit monitors the sampled voltage of input, namely by comparing with the built-in reference voltage of voltage monitor, then exports high level or low level to buffer circuit.Buffer circuit is transferred to control circuit with the output signal isolation of voltage monitoring circuit.Then control circuit is controlled the silicon controlled conducting or is ended to come the protection power source module by accepting the signal of buffer circuit.When the phototransistor conducting in the buffer circuit, the controllable silicon cut-off, the control terminal of power module is unsettled, and power module output is normal; When the phototransistor in the buffer circuit ends, controlled silicon conducting, the control terminal of power module is dragged down, and power module is turned off.
By adopting technique scheme, the utlity model has following beneficial effect:
Shutoff formula over under-voltage protection circuit of the present utility model can accurately arrange the protection point as requested; Realize after detection voltage exceeds setting range, can carrying out immediately the protection of shutoff formula.
Description of drawings
Fig. 1 is shutoff formula over under-voltage protection circuit circuit diagram described in the utility model.
Fig. 2 is the another kind of circuit diagram of shutoff formula over under-voltage protection circuit described in the utility model.8 pin that are the voltage monitor 201 in the voltage monitoring circuit 20 with unique difference of Fig. 1 are by 503 power supplies of independent auxiliary source, and all the other are identical.
Among the figure, 101-the first resistor, 102-the second resistor, 103-the 3rd resistor, the 201-voltage monitor, 202-the 4th resistor, 301-photoelectrical coupler, 401-the 5th resistor, 402-the 6th resistor, 403-the 7th resistor, 404-electric capacity, 405-voltage-stabiliser tube, 406-controllable silicon, the 407-diode, 501-power module output plus terminal, 502-power module output ground, the auxiliary anode of 601-input, 602-inputs ground, 603 switch of the power supply module control terminals.
Embodiment
Below in conjunction with accompanying drawing this patent is further explained.The components and parts sequence number of execution mode is the components and parts of describing in the description of drawings.
Shutoff formula output over under-voltage protection circuit of the present utility model; comprise a sample circuit 10, a voltage monitoring circuit 20, a buffer circuit 30, a control circuit 40, a power module output plus terminal 501,602, the switch of the power supply module control terminals 603 in 601, one an input ground of the auxiliary anode of 502, the inputs in power module output ground.
The power module of above indication all refers to have the power module of switch control terminal; it is the object that this shutoff formula output over under-voltage protection circuit need to be protected; its control logic is defined as: high level or when unsettled power module output is arranged, low level or power module no-output during with input ground short circuit.Specifically can select the power module V24A28T200BL of U.S. VICOR company.
The output voltage of 10 pairs of power modules of sample circuit is sampled, and then sampled voltage is connected to voltage monitoring circuit 20.By in sample circuit 10, choosing suitable sample resistance, can arrange accurately under-voltage or over-voltage protection point.Sample circuit comprises: first resistance 101, second resistance 102, the 3rd resistance 103.One end of the first resistance 101 links to each other with the output plus terminal 501 of power module; The other end of the first resistance 101 is connected successively by being connected with output ground 502 behind the second resistance 102, the 3rd resistance 103; Wherein the tie point of the first resistance 101 and the second resistance 102 is under-voltage sampled point; The tie point of the second resistance 102 and the 3rd resistance 103 is the overvoltage sampled point.
The sampled voltage of 20 pairs of inputs of voltage monitoring circuit monitors, namely by comparing with the built-in reference voltage of voltage monitor 201, then exports high level or low level to buffer circuit 30.When the output voltage of power module is normal, voltage monitor 201 output high level; When the output voltage of power module is unusual, i.e. during under-voltage or overvoltage, voltage monitor 201 output low levels.Voltage monitoring circuit 20 comprises a voltage monitor 201 and the 4th resistance 202.This voltage monitor 201 is the monitoring voltage chip, and it comprises two relatively passage and two collector electrode outputs, and is built-in with reference voltage.This voltage monitor 201 comprises 8 pins: 8 pin are feeder ear, and 4 pin are power supply ground; 2 pin and 3 pin are input; 5 pin and 6 pin are output; 1 pin and the general short circuit of 7 pin.In this application, 2 pin of voltage monitor 201 are connected with under-voltage sampled point in the sample circuit 10; 3 pin of voltage monitor 201 are connected with overvoltage sampled point in the sample circuit 10; 8 pin of voltage monitor 201 and power module output plus terminal 501 short circuits; 4 pin of voltage monitor 201 and output ground 502 short circuits; Be connected to buffer circuit 30 behind 5 pin of voltage monitor 201 and the 6 pin short circuits.8 pin of one termination voltage monitor 201 of the 4th resistance 202,5 pin of another termination voltage monitor 201 and 6 pin.
Control circuit 40 is by accepting the signal of buffer circuit 30, and conducting or the cut-off of then controlling controllable silicon 406 come the protection power source module.When phototransistor 303 conducting in the buffer circuit 30, controllable silicon 406 cut-offs, the control terminal 603 of power module is unsettled, and power module output is normal; When phototransistor 303 cut-off in the buffer circuit 30, controllable silicon 406 conductings, the control terminal 503 of power module is dragged down, and power module is turned off.Control circuit comprises: the 5th resistance 401, the 6th resistance 402, the 7th resistance 403, an electric capacity 404, a voltage-stabiliser tube 405, a controllable silicon 406, a diode 407; The anodic bonding of the trigger electrode of controllable silicon 406 and voltage-stabiliser tube 405 wherein; The negative electrode of voltage-stabiliser tube 405 is connected with the collector electrode of phototransistor 303 in the buffer circuit 30, connects input ground 602 by the 6th resistance 402 simultaneously; The negative electrode of voltage-stabiliser tube 405 is connected by the auxiliary anode 601 of the 5th resistance 401 and input in addition.The positive pole of electric capacity 404 is connected with the negative electrode of voltage-stabiliser tube 405.The negative pole of electric capacity 404 connects input ground 602.The emitter of phototransistor 303 connects input ground 602 in the buffer circuit 30.The anode of controllable silicon 406 is connected by the auxiliary anode 601 of the 7th resistance 403 and input, is connected with the control terminal 603 of power module by diode 407 simultaneously.The negative electrode of controllable silicon 406 connects input ground 602.Controllable silicon 406 is one-way SCR.
When the output voltage of power module was in the normal voltage scope, then voltage monitoring circuit 20 exported high level to buffer circuit 30 by sampling voltage and voltage monitor 201 built-in reference voltages are compared.Because the anode of light-emitting diode 302 connects 5 pin and 6 pin of voltage monitor 201 in the voltage monitoring circuit 20 in the buffer circuit 30, it is high level, the negative electrode of light-emitting diode 302 connects output ground 502, so the time light-emitting diode 302 conductings, also conducting of phototransistor 303, the trigger electrode voltage of controllable silicon 406 is low level, the controllable silicon cut-off, diode 407 cut-offs, the control terminal 603 of power module is in vacant state, and power module output is normal;
Otherwise when the output voltage of power module exceeds the normal voltage scope, i.e. during under-voltage or overvoltage, voltage monitoring circuit 20 is by comparing sampling voltage and voltage monitor 201 built-in reference voltages, and then output low level is to buffer circuit 30.Because the anode of light-emitting diode 302 connects 5 pin and 6 pin of voltage monitor 201 in the voltage monitoring circuit in the buffer circuit 30, i.e. low level, the negative electrode of light-emitting diode 302 connects output ground 502.So the time light-emitting diode 302 not conductings, phototransistor 303 also not conductings.This moment, the trigger electrode voltage of controllable silicon 406 was high level owing to the series connection dividing potential drop of the 5th resistance 401 and the 6th resistance 402, controllable silicon 406 conductings, and also conducting of diode 407, the control terminal 603 of power module is dragged down, and power module is turned off.Because the existence of continued flow resistance 403, controllable silicon 406 can be kept conducting.So just reached the effect that power module is continued shutoff.
The setting of overvoltage/undervoltage point clicks calculating in the sample circuit:
Formula (1): the resistance (ohm) of mistake pressure point (volt) * the 3rd resistance 103=［ resistance (ohm) of resistance (ohm)+the 3rd resistance 103 of the resistance of the first resistance 101 (ohm)+second resistance 102 ］ * 1.27(volt);
Formula (2): the resistance (ohm) of resistance (ohm)+the 3rd resistance 103 of resistance (ohm)+second resistance 102 of under-voltage point (volt) * ［ resistance (ohm) of the resistance of the second resistance 102 (ohm)+the 3rd resistance 103 ］=first resistance 101 ］ * the 1.27(volt).
The utility model also can be used for the input of power module, by detecting input voltage, and power cutoff module during under-voltage or overvoltage when input voltage.
Shutoff formula over under-voltage protection circuit of the present utility model can accurately arrange the protection point as requested; Realize after detection voltage exceeds setting range, can carrying out immediately the protection of shutoff formula.
The utility model is not limited to above-described embodiment, to those skilled in the art, the routine that embodiment of the present utility model does is improved or is changed all still at protection range of the present utility model.。
Claims (5)
1. a shutoff formula is exported over under-voltage protection circuit, it is characterized in that: comprise sample circuit, voltage monitoring circuit, buffer circuit, control circuit, power module output plus terminal, power module output ground, the auxiliary anode of input, input ground and switch of the power supply module control terminal;
Described power module refers to have the power module of switch control terminal, and its control logic is defined as: high level or when unsettled power module output is arranged, low level or power module no-output during with input ground short circuit;
Sample circuit is the universal circuit with voltage sample function, is provided with input port and output port; Input port connects power module output plus terminal and output ground; Output port connects the input port of voltage monitoring circuit;
Voltage monitoring circuit is to have the universal circuit that input signal and built-in reference voltage is compared, then exports high level or low-level functionality, is provided with input port, output port and power port; Input port connects the output port of sample circuit; Output port connects the input port of buffer circuit; Power port connects power module output plus terminal and output ground;
Buffer circuit is the universal circuit that has input signal and output signal isolation features, comprises a light-emitting diode and a phototransistor; The anode of light-emitting diode connects the output of voltage monitor in the voltage monitoring circuit; The negative electrode of light-emitting diode connects output ground; Two terminals of photoelectric crystal are connected to the input port of control circuit; When voltage monitor output high level, the light-emitting diode conducting, phototransistor is conducting also; When the voltage monitor output low level, not conducting of light-emitting diode, phototransistor cut-off;
Control circuit is to have the universal circuit of controlling silicon controlled conducting or cutoff function according to input signal, is provided with input port and output port; Input port connects the output port of buffer circuit; Output port connects and connects respectively the auxiliary anode of input, input ground, switch of the power supply module control terminal.
2. described shutoff formula is exported over under-voltage protection circuit according to claim 1, and it is characterized in that: described sample circuit is sampled to the output voltage of power module, then sampled voltage is connected to voltage monitoring circuit; Sample circuit comprises: the first resistance, the second resistance and the 3rd resistance; One end of the first resistance links to each other with the output plus terminal of power module; The other end of the first resistance is connected successively by being connected with output ground behind the second resistance, the 3rd resistance; Wherein the tie point of the first resistance and the second resistance is under-voltage sampled point; The tie point of the second resistance and the 3rd resistance is the overvoltage sampled point.
3. described shutoff formula is exported over under-voltage protection circuit according to claim 1, it is characterized in that: described voltage monitoring circuit monitors the sampled voltage of input, namely by comparing with the built-in reference voltage of voltage monitor, then export high level or low level to buffer circuit; When the output voltage of power module is normal, voltage monitor output high level; When the output voltage of power module is unusual, i.e. during under-voltage or overvoltage, the voltage monitor output low level; Voltage monitoring circuit comprises a voltage monitor and the 4th resistance; Voltage monitor is the monitoring voltage chip, and it comprises two relatively passage and two collector electrode outputs, and is built-in with reference voltage; Voltage monitor comprises 8 pins: 8 pin are feeder ear, and 4 pin are power supply ground; 2 pin and 3 pin are input; 5 pin and 6 pin are output; 1 pin and 7 pin short circuits; 2 pin of voltage monitor are connected with under-voltage sampled point in the sample circuit; 3 pin of voltage monitor are connected with overvoltage sampled point in the sample circuit; 8 pin of voltage monitor and power module output plus terminal short circuit; 4 pin of voltage monitor and output ground short circuit; Be connected to buffer circuit behind 5 pin of voltage monitor and the 6 pin short circuits; 8 pin of one termination voltage monitor of the 4th resistance, 5 pin of another termination voltage monitor and 6 pin.
4. described shutoff formula is exported over under-voltage protection circuit according to claim 1, it is characterized in that: described buffer circuit is transferred to control circuit with the output signal isolation of voltage monitoring circuit; Buffer circuit comprises a photoelectrical coupler, and this photoelectrical coupler comprises a light-emitting diode and a phototransistor; The anode of light-emitting diode connects 5 pin and 6 pin of voltage monitor in the voltage monitoring circuit; The negative electrode of light-emitting diode connects output ground; Two terminals of phototransistor are connected to control circuit.
5. described shutoff formula is exported over under-voltage protection circuit according to claim 1, it is characterized in that: then described control circuit is controlled the silicon controlled conducting or is ended to come the protection power source module by accepting the signal of buffer circuit; Control circuit comprises: the 5th resistance, the 6th resistance, the 7th resistance, an electric capacity, a voltage-stabiliser tube, a controllable silicon, a diode; The anodic bonding of silicon controlled trigger electrode and voltage-stabiliser tube wherein; The negative electrode of voltage-stabiliser tube is connected with the collector electrode of phototransistor in the buffer circuit, connects input ground by the 6th resistance simultaneously; The negative electrode of voltage-stabiliser tube is connected by the auxiliary anode of the 5th resistance and input in addition; The positive pole of electric capacity is connected with the negative electrode of voltage-stabiliser tube, and the negative pole of electric capacity connects input ground; The emitter of phototransistor connects input ground in the buffer circuit; The silicon controlled anode is connected by the auxiliary anode of the 7th resistance and input, is connected with the control terminal of power module by diode simultaneously; Controllable silicon is one-way SCR, and the silicon controlled negative electrode connects input ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220218293 CN202712814U (en) | 2012-05-16 | 2012-05-16 | Shutdown output over-voltage and under-voltage protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220218293 CN202712814U (en) | 2012-05-16 | 2012-05-16 | Shutdown output over-voltage and under-voltage protection circuit |
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| CN202712814U true CN202712814U (en) | 2013-01-30 |
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| CN 201220218293 Expired - Fee Related CN202712814U (en) | 2012-05-16 | 2012-05-16 | Shutdown output over-voltage and under-voltage protection circuit |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105305796A (en) * | 2015-10-12 | 2016-02-03 | 重庆凯瑞电动汽车系统有限公司 | Frequency converter direct-current busbar overvoltage and under-voltage protection method and system |
| CN106099843A (en) * | 2016-05-05 | 2016-11-09 | 中国石油集团渤海钻探工程有限公司 | A kind of intelligent drilling tool power protection circuit and voltage and current guard method |
| CN106655083A (en) * | 2016-09-19 | 2017-05-10 | 深圳市康凯斯信息技术有限公司 | Wide voltage power supply protection device and method for electric car vehicle equipment |
| CN108872672A (en) * | 2018-07-09 | 2018-11-23 | 中检质技检验检测科学研究院有限公司 | Based on short-circuit test overvoltage photoelectric insulating protection device |
| CN109141342A (en) * | 2018-07-16 | 2019-01-04 | 哈尔滨工程大学 | A kind of handheld portable precision strain gauge |
| CN109407592A (en) * | 2018-12-18 | 2019-03-01 | 安徽庆宇光电科技有限公司 | A kind of remote sensing monitoring control circuit |
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2012
- 2012-05-16 CN CN 201220218293 patent/CN202712814U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105305796A (en) * | 2015-10-12 | 2016-02-03 | 重庆凯瑞电动汽车系统有限公司 | Frequency converter direct-current busbar overvoltage and under-voltage protection method and system |
| CN106099843A (en) * | 2016-05-05 | 2016-11-09 | 中国石油集团渤海钻探工程有限公司 | A kind of intelligent drilling tool power protection circuit and voltage and current guard method |
| CN106655083A (en) * | 2016-09-19 | 2017-05-10 | 深圳市康凯斯信息技术有限公司 | Wide voltage power supply protection device and method for electric car vehicle equipment |
| CN106655083B (en) * | 2016-09-19 | 2019-06-11 | 深圳市康凯斯信息技术有限公司 | A kind of the Width funtion apparatus for protecting power supply and method of electric-vehicle-mounted equipment |
| CN108872672A (en) * | 2018-07-09 | 2018-11-23 | 中检质技检验检测科学研究院有限公司 | Based on short-circuit test overvoltage photoelectric insulating protection device |
| CN109141342A (en) * | 2018-07-16 | 2019-01-04 | 哈尔滨工程大学 | A kind of handheld portable precision strain gauge |
| CN109407592A (en) * | 2018-12-18 | 2019-03-01 | 安徽庆宇光电科技有限公司 | A kind of remote sensing monitoring control circuit |
| CN109407592B (en) * | 2018-12-18 | 2024-01-19 | 安徽庆宇光电科技有限公司 | Remote sensing monitoring control circuit |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130130 Termination date: 20190516 |
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| CF01 | Termination of patent right due to non-payment of annual fee |