CN201312113Y - Over-voltage and under-voltage protection circuit for vehicle electrical appliance - Google Patents
Over-voltage and under-voltage protection circuit for vehicle electrical appliance Download PDFInfo
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- CN201312113Y CN201312113Y CNU200820231711XU CN200820231711U CN201312113Y CN 201312113 Y CN201312113 Y CN 201312113Y CN U200820231711X U CNU200820231711X U CN U200820231711XU CN 200820231711 U CN200820231711 U CN 200820231711U CN 201312113 Y CN201312113 Y CN 201312113Y
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Abstract
The utility model discloses an over-voltage and under-voltage protection circuit for vehicle electrical appliance. An under-voltage identification circuit comprises divider resistances R3, R5, a triode Q2 and an adjustable shunt regulator U1. An over-voltage identification circuit comprises a voltage-stabilizing diode D6 and a triode Q3, and a switch circuit comprises a power relay LS1 and a triode Q1. An intermediate node A is connected with a REF electrode of the U1, and input voltage is acquired and divided by the divider resistances R3, R5. A CATHODE electrode of the U1 is connected with a base electrode of the triode Q2, a collecting electrode of the triode Q2 is connected with a base electrode of the triode Q1, and a collecting electrode of the triode Q1 is connected with an input terminal of the power relay LS1. Input voltage is acquired by the voltage-stabilizing diode D6 to be output to a base electrode of the triode Q3, and a collecting electrode of the triode Q3 is connected with the base electrode of the triode Q1. The over-voltage and under-voltage protection circuit for vehicle electrical appliance is characterized by sensitive on-off movement, safety operation and low manufacture cost, which is adaptable to automobile industry.
Description
Technical field
The utility model relates to a kind of protective circuit that is used for vehicle mounted electrical apparatus, relates in particular to a kind of overvoltage, under-voltage protecting circuit that is used for vehicle mounted electrical apparatus.
Background technology
In vehicle power design, must consider automobile situation too low or too high for voltage when ignition trigger and throw load.When ignition trigger, battery voltage may be reduced to about 20% of nominal voltage, and in running, may occur the situation of overtension again.If there is not under-voltage, overvoltage crowbar, when under-voltage, easily automobile storage battery is caused damage, when overvoltage, cause the subsequent conditioning circuit high-voltage breakdown again easily.In present vehicle-mounted electrical system design, mainly adopt the mode of DC-DC conversion.And in the bigger application of power ratio, the upper limit withstand voltage of a lot of DC-DC translation circuits is no more than 40V, very easily damages in actual moving process.And in the process of automotive ignition, if there is not under-voltage protection, there is the situation of striving electricity with engine again in electric equipment, causes the engine start difficulty.Especially in northerly winter, cause engine to start sometimes.
Summary of the invention
The utility model is at the proposition of above problem, and develops a kind of overvoltage, under-voltage control circuit that cheaply, does not need outside auxiliary stabilized voltage power supply.The technological means that the utility model adopts is as follows:
A kind of overvoltage, under-voltage protecting circuit is characterized in that comprising under-voltage judging circuit, overvoltage judging circuit and switching circuit; Described under-voltage judging circuit comprises divider resistance R3, R5, triode Q2 and adjustable shunt regulator U1; Described overvoltage judging circuit comprises voltage stabilizing didoe D6 and triode Q3; Described switching circuit comprises power relay LS1 and triode Q1; Divider resistance R3, R5 are used for input voltage is gathered dividing potential drop, and the intermediate node A of divider resistance R3, R5 is connected to the REF utmost point of adjustable shunt regulator U1, wherein the CATHODE utmost point of adjustable shunt regulator U1 is connected on the base stage of triode Q2, the collector electrode of described triode Q2 is connected on the base stage of triode Q1, and the collector electrode of described triode Q1 is connected to the input of power relay LS1; Described input voltage is gathered through voltage stabilizing didoe D6 and is input on the base stage of triode Q3, and the collector electrode of described triode Q3 is connected on the base stage of triode Q1.
Also comprise power supply unlatching delay circuit, discharge loop and TVS protection component D2 in the described switching circuit; Described power supply unlatching delay circuit is made up of resistance R 2 and capacitor C 2, and wherein resistance R 2 and capacitor C 2 are parallel to collector electrode and the base stage two ends of triode Q1; Described discharge loop diode D1 and capacitor C 1 are formed the input/output terminal that is connected in parallel on power relay LS1; TVS protection component D2 is connected output.
Owing to adopted technique scheme, the overvoltage that is used for vehicle mounted electrical apparatus that the utility model provides, under-voltage protecting circuit can be followed the tracks of the detection supply power voltage at any time, and can when electric power system voltage is higher or lower than the voltage range of normal setting, produce control action, cut off the electricity supply immediately; And when electric power system voltage is fallen the voltage range of setting again, automatic recovery of power supply.In addition, this circuit does not need accessory power supply, and this switch motion sensitivity, and is safe and reliable.Because it is simple in structure, with low cost being suitable for extensively promoted in automobile industry.
Description of drawings
The utility model has two width of cloth accompanying drawings:
Fig. 1 is a mobile unit supply module block diagram described in the utility model;
Fig. 2 is a circuit theory of the present utility model.
Embodiment
A kind of overvoltage as shown in Figure 2, under-voltage protecting circuit, main design philosophy be can set the under-voltage protection point by adjusting divider resistance, set over-voltage protection point by selecting suitable voltage stabilizing didoe.When system's input voltage falls into the interval, working point of setting, relay adhesive, circuit turn-on; And when system's input voltage was below or above this scope, relay disconnected, and cut off the power supply of protected circuit.This protective circuit comprises under-voltage judging circuit, overvoltage judging circuit and switching circuit; Resistance R 3, R5 and adjustable shunt regulator U1 have constituted the under-voltage detection judging circuit of input, and by selecting the different resistance R 3 and the resistance of resistance R 5, can set the under-voltage differentiation point of input voltage flexibly.Wherein U1 is that Adjustable PrecisionShunt Regulator (that is: adjustable shunt regulator) input voltage is after divider resistance R3 and resistance R 5 series connection dividing potential drops; compare with resistance R 5 voltages at nodes and reference voltage 2.5V in resistance R 3; if this voltage is higher than reference voltage; think that then voltage is higher than the under-voltage protection point; the CATHODE utmost point output low level of adjustable shunt regulator U1; behind voltage stabilizing didoe D5; the base stage level that can guarantee triode Q2 is 0V substantially; triode Q1 base stage high level; triode Q1 conducting; relay is opened, circuit turn-on.When resistance R 3 and resistance R 5 node place voltages are lower than reference voltage; think that then input voltage is lower than the under-voltage protection point of setting; the CATHODE utmost point of adjustable shunt regulator U1 and the ANODE utmost point turn-off;, the base stage level of triode Q2 is drawn high by resistance R 1, triode Q2 conducting; triode Q1 base stage is put low level; triode Q1 turn-offs, and relay turn-offs, and circuit disconnects.Capacitor C 3 can constitute the RC charging circuit with resistance R 3, can adjust the time of electrifying startup time-delay.Resistance R 4 and R2 constitute the bleeder circuit of connect, and the electric current of the triode Q1 base stage that can prevent to flow through when input voltage is too high is excessive, causes triode Q1 damage.When relay turn-offs, can produce high pressure at the 2nd pin of relay, can cause the damage of triode Q1.By D3, can be relay coil discharge loop is provided, prevent that the high pressure that produces when relay turn-offs from causing Q1 to damage.
Voltage stabilizing didoe D6, triode Q3, resistance R 6 and resistance R 7 have constituted the overvoltage judging circuit.Wherein crossing the setting of pressure point is set by the nominal value of voltage stabilizing didoe D6.When input voltage was higher than the nominal value of voltage stabilizing didoe D6, triode Q3 base stage level raise, triode Q3 conducting, and the base stage level of triode Q1 is dragged down, and triode Q1 turn-offs, and relay turn-offs, and circuit disconnects.When input voltage was lower than the nominal value of voltage stabilizing didoe D6, triode Q3 base stage was a low level, and triode Q3 is in closed condition, and the base stage of triode Q1 is a high level, triode Q1 conducting, and relay is opened, circuit turn-on.
Switching circuit mainly is made of triode Q1 and power relay LS1, the base stage level height by triode Q1, and the conducting of power controlling relay LS1 or close reaches the control circuit switching purposes.Switching circuit comprises power relay LS1, discharge loop diode D1, capacitor C 1, and delay circuit resistance R 2 is opened in TVS protection component diode D2 and power supply, capacitor C 2 is formed.Wherein the RC charging circuit be made up of resistance R 2 and capacitor C 2 of delay circuit constitutes, can prevent that input voltage is when overvoltage, the fluctuation of under-voltage set point, triode Q1 switching repeatedly, the frequency of sluggish power relay LS1 switch motion, when outside the operate as normal interval of input voltage, getting back to the working range of normal setting, at first charge by 2 pairs of capacitor C 2 of resistance R by setting.Along with the rising of capacitor C 2 voltages, triode Q1 conducting gradually, the relay adhesive, circuit is opened.
The voltage of automobile storage battery output is behind overvoltage of the present utility model, under-voltage protecting circuit as shown in Figure 1; enter into the DC-DC translation circuit; can solve effectively in the flimsy situation of DC-DC translation circuit running and take place; also can effectively avoid in the process of automotive ignition simultaneously; there is the situation of striving electricity with engine again in electric equipment, causes the engine start situation of difficult to take place.
The above; it only is the preferable embodiment of the utility model; but protection range of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; be equal to replacement or change according to the technical solution of the utility model and inventive concept thereof, all should be encompassed within the protection range of the present utility model.
Claims (2)
1, a kind of overvoltage, under-voltage protecting circuit is characterized in that comprising under-voltage judging circuit, overvoltage judging circuit and switching circuit; Described under-voltage judging circuit comprises divider resistance R3, R5, triode Q2 and adjustable shunt regulator U1; Described overvoltage judging circuit comprises voltage stabilizing didoe D6 and triode Q3; Described switching circuit comprises power relay LS1 and triode Q1; Divider resistance R3, R5 are used for input voltage is gathered dividing potential drop, and the intermediate node A of divider resistance R3, R5 is connected to the REF utmost point of adjustable shunt regulator U1, wherein the CATHODE utmost point of adjustable shunt regulator U1 is connected on the base stage of triode Q2, the collector electrode of described triode Q2 is connected on the base stage of triode Q1, and the collector electrode of described triode Q1 is connected to the input of power relay LS1; Described input voltage is gathered through voltage stabilizing didoe D6 and is input on the base stage of triode Q3, and the collector electrode of described triode Q3 is connected on the base stage of triode Q1.
2, a kind of overvoltage according to claim 1, under-voltage protecting circuit is characterized in that also comprising in the described switching circuit power supply unlatching delay circuit, discharge loop and TVS protection component D2; Described power supply unlatching delay circuit is made up of resistance R 2 and capacitor C 2, and wherein resistance R 2 and capacitor C 2 are parallel to collector electrode and the base stage two ends of triode Q1; Described discharge loop diode D1 and capacitor C 1 are formed the input/output terminal that is connected in parallel on power relay LS1; TVS protection component D2 is connected output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820231711XU CN201312113Y (en) | 2008-12-11 | 2008-12-11 | Over-voltage and under-voltage protection circuit for vehicle electrical appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820231711XU CN201312113Y (en) | 2008-12-11 | 2008-12-11 | Over-voltage and under-voltage protection circuit for vehicle electrical appliance |
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| Publication Number | Publication Date |
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| CN201312113Y true CN201312113Y (en) | 2009-09-16 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU200820231711XU Expired - Fee Related CN201312113Y (en) | 2008-12-11 | 2008-12-11 | Over-voltage and under-voltage protection circuit for vehicle electrical appliance |
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| CN (1) | CN201312113Y (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102270831A (en) * | 2011-07-26 | 2011-12-07 | 广州日滨科技发展有限公司 | Wide-voltage power protection device of intelligent vehicle-mounted terminal |
| CN102427217A (en) * | 2011-12-29 | 2012-04-25 | 深圳市凌启电子有限公司 | Power supply over-voltage protection circuit and system based on vehicle-mounted equipment |
| CN103124452A (en) * | 2011-11-18 | 2013-05-29 | 海洋王（东莞）照明科技有限公司 | LED driving circuit and LED lamp |
| CN105786073A (en) * | 2016-03-22 | 2016-07-20 | 广州汽车集团股份有限公司 | Power supply control device |
| 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 |
| CN107332491A (en) * | 2017-08-01 | 2017-11-07 | 合肥初慕科技有限公司 | AC inverter driving system device with DC over-voltage protection |
| CN113690974A (en) * | 2021-08-19 | 2021-11-23 | 深圳诺倍能电子技术有限公司 | Undervoltage protection and slow start circuit |
-
2008
- 2008-12-11 CN CNU200820231711XU patent/CN201312113Y/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102270831A (en) * | 2011-07-26 | 2011-12-07 | 广州日滨科技发展有限公司 | Wide-voltage power protection device of intelligent vehicle-mounted terminal |
| CN102270831B (en) * | 2011-07-26 | 2014-04-16 | 广州日滨科技发展有限公司 | Wide-voltage power protection device of intelligent vehicle-mounted terminal |
| CN103124452A (en) * | 2011-11-18 | 2013-05-29 | 海洋王（东莞）照明科技有限公司 | LED driving circuit and LED lamp |
| CN102427217A (en) * | 2011-12-29 | 2012-04-25 | 深圳市凌启电子有限公司 | Power supply over-voltage protection circuit and system based on vehicle-mounted equipment |
| CN105786073A (en) * | 2016-03-22 | 2016-07-20 | 广州汽车集团股份有限公司 | Power supply control device |
| CN105786073B (en) * | 2016-03-22 | 2017-08-25 | 广州汽车集团股份有限公司 | A kind of power-control device |
| 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 |
| CN107332491A (en) * | 2017-08-01 | 2017-11-07 | 合肥初慕科技有限公司 | AC inverter driving system device with DC over-voltage protection |
| CN113690974A (en) * | 2021-08-19 | 2021-11-23 | 深圳诺倍能电子技术有限公司 | Undervoltage protection and slow start circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Dalian Golden Hualu Digital Technology Co., Ltd. Assignor: China Hualu Group Ltd. Contract record no.: 2012210000123 Denomination of utility model: Over-voltage and under-voltage protection circuit for vehicle electrical appliance Granted publication date: 20090916 License type: Exclusive License Record date: 20120924 |
|
| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| EC01 | Cancellation of recordation of patent licensing contract | ||
| EC01 | Cancellation of recordation of patent licensing contract |
Assignee: Dalian Golden Hualu Digital Technology Co., Ltd. Assignor: China Hualu Group Ltd. Contract record no.: 2012210000123 Date of cancellation: 20180109 |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090916 Termination date: 20171211 |