CN203553911U - Protection circuit capable of automatically adapting to vehicle power supply voltage - Google Patents
Protection circuit capable of automatically adapting to vehicle power supply voltage Download PDFInfo
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- CN203553911U CN203553911U CN201320644587.0U CN201320644587U CN203553911U CN 203553911 U CN203553911 U CN 203553911U CN 201320644587 U CN201320644587 U CN 201320644587U CN 203553911 U CN203553911 U CN 203553911U
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- 239000003990 capacitor Substances 0.000 claims abstract description 28
- 230000005669 field effect Effects 0.000 claims abstract description 12
- 230000003044 adaptive effect Effects 0.000 claims abstract description 8
- 230000000087 stabilizing effect Effects 0.000 claims description 22
- 230000001681 protective effect Effects 0.000 claims description 8
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
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Abstract
本实用新型一种自适应车辆电源电压的保护电路，属于车辆电源保护电路技术领域；解决的技术问题是：提供一种能自适应车辆电源电压并自动进行欠压保护的车辆电源保护电路；采用的技术方案是：一种自适应车辆电源电压的保护电路，电路结构为：二极管D1的正极并接电阻R7的一端和电阻R11的一端后与电源输入端P1相连，所述二极管D1的负极并接电阻R4的一端、电阻R1的一端、电阻R2的一端、稳压二极管DW2的负极、电阻R3的一端和电容C1的一端后与P沟道型场效应管Q1的源极相连；本实用新型适用于汽车配电领域。
The utility model is an adaptive vehicle power supply voltage protection circuit, which belongs to the technical field of vehicle power supply protection circuits; the technical problem to be solved is: to provide a vehicle power supply protection circuit that can adapt to the vehicle power supply voltage and automatically perform undervoltage protection; The technical solution is: a protection circuit for adaptive vehicle power supply voltage, the circuit structure is: the anode of the diode D1 is connected in parallel with one end of the resistor R7 and one end of the resistor R11 and then connected with the power input terminal P1, and the cathode of the diode D1 is connected in parallel After connecting one end of resistor R4, one end of resistor R1, one end of resistor R2, the negative pole of Zener diode DW2, one end of resistor R3 and one end of capacitor C1, it is connected to the source of P-channel type field effect transistor Q1; the utility model Applicable to the field of automobile power distribution.
Description
Technical field
The protective circuit of a kind of adaptive vehicle supply voltage of the utility model, belongs to vehicle power supply protective circuit technical field.
Background technology
Along with mobile unit CPU frequency is more and more higher; power consumption is increasing; consumption to storage battery electric weight is increasing; at present domestic vehicle power supply is mainly two kinds of DC12V and DC24V; some mobile units; particularly installing is standby afterwards also need be powered by storage battery after vehicle is flame-out; as GNSS mobile unit, sound system etc.; when for a long time, do not use vehicle; because storage battery is by continuous discharge, if there is no to put (the low electricity of storage battery) protective circuit, can causes storage battery to cross and put; gently cause vehicle not light a fire, heavy cause storage battery to damage and scrap.
Now more existing equipment can be realized the low electric protection of storage battery, but can only be respectively for the vehicle of different electrical voltage systems, as be divided into 12V version and 24V version, 12V version can only work between 10-15V, 24V version can only work between 20-28V, low-voltage variation voltage is respectively 10V and 20V, the equipment of applicable 12V can not work in 24V system, the equipment of applicable 24V can not work in 12V system, also have equipment component to go to arrange different electrical power system by jumper switch, as the automobile travel recorder of some brands, if adjust wrong to the equipment wire jumper of operating voltage is set by jumper switch, do not reach the object of protection, for example equipment wire jumper is set to 12V system, but be connected on 24V vehicle, because mobile unit can be operated in wide power voltage range, but the low electric protection of its storage battery is 10V left and right, if stop for a long time, the battery cell discharge of 24V is just protected to 10V, that storage battery has just been scrapped substantially.
Utility model content
The utility model overcomes the deficiency that prior art exists, and technical problem to be solved is: the vehicle power supply protective circuit that a kind of energy adaptive vehicle supply voltage is provided and automatically carries out under-voltage protection.
For solving the problems of the technologies described above, the technical scheme that the utility model adopts is: a kind of protective circuit of adaptive vehicle supply voltage, circuit structure is: behind anodal and one end of connecting resistance R7 and one end of resistance R 11 of diode D1, be connected with power input P1, behind one end of the negative pole of described diode D1 connecting resistance R4, one end of resistance R 1, one end of resistance R 2, one end of the negative pole of voltage stabilizing didoe DW2, resistance R 3 and one end of capacitor C 1, be connected with the source electrode of P channel-type field effect transistor Q1;
The other end of described resistance R 4 also connects the negative pole of controlled voltage stabilizing didoe DW3, be connected with the negative input end a2 of comparator U1 behind one end of the reference utmost point of controlled voltage stabilizing didoe DW3 and capacitor C 4, the equal ground connection of the other end of the positive pole of described controlled voltage stabilizing didoe DW3 and capacitor C 4; The other end of described resistance R 1 is connected with the negative pole of voltage stabilizing didoe DW1, behind one end of the anodal shunt-wound capacitance C2 of described voltage stabilizing didoe DW1, is connected with the cathode power supply end of comparator U1, and the other end ground connection of described capacitor C 2; Behind one end of one end of the other end of described resistance R 2 connecting resistance R5 and resistance R 10, be connected with the output of comparator U1, the other end of described resistance R 10 is connected with the base stage of NPN type triode Q2;
Anodal and the other end of connecting resistance R3 of described voltage stabilizing didoe DW2 is, be connected with the grid of P channel-type field effect transistor Q1 behind one end of the other end of capacitor C 1 and resistance R 6, the other end of described resistance R 6 is connected with the collector electrode of NPN type triode Q2, the grounded emitter of described NPN type triode Q2, the drain electrode of described P channel-type field effect transistor Q1 is power output end P2;
After the other end of one end of one end of one end of the other end of described resistance R 7 connecting resistance R8, resistance R 9, capacitor C 3 and resistance R 5, be connected with the positive input terminal a1 of comparator U1, the other end of described resistance R 8 is connected with the second binding post d2, the equal ground connection of the other end of the other end of described resistance R 9 and capacitor C 3, the negative power supply end ground connection of described comparator U1;
Behind one end of one end of the other end of described resistance R 11 connecting resistance R12 and capacitor C 5, be connected with the negative input end b2 of comparator U2, the equal ground connection of the other end of the other end of described resistance R 12 and capacitor C 5, behind the positive input terminal b1 of described comparator U2 one end of connecting resistance R13, be connected with the positive pole of diode D2, the other end of described resistance R 13 is connected with+12V power end; The negative pole of described diode D2 and connect the output of comparator U2 after be connected with the first binding post d1, described the 3rd binding post d3 ground connection.
The beneficial effect that the utility model compared with prior art has is:
One, the utlity model has voltage detecting function, electric pressure that can automatic decision input power, has lock function to 24V voltage detecting, can prevent from that 24V supply voltage from dropping within the scope of 12V supply voltage to cause fault;
Two, the utlity model has magnetic hysteresis defencive function, when input voltage is lower than protection voltage, the output of circuit power cutoff, if power-on output, supply voltage must be higher than the low electric protection voltage of setting, mains fluctuations in the time of can preventing circuit protection like this and make power supply output unstable;
Three, the utility model possesses manual mode function, the supply voltage that can need protect by jumper settings, if wire jumper short circuit the second binding post d2 and the 3rd binding post d3, comparator U2 is output as low, the power supply that is equivalent to detect is 24V storage battery, if the first binding post d1, the second binding post d2 and the 3rd binding post d3 standard-sized sheet road, comparator U2 is output as high-impedance state, and the power supply that is equivalent to detect is 12V storage battery;
Four, the utility model circuit structure is succinct, and oneself power consumption is low, without impact, practical on vehicle accumulator.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the utility model is described in more detail:
Fig. 1 is electrical block diagram of the present utility model.
Embodiment
As shown in Figure 1; the protective circuit of a kind of adaptive vehicle supply voltage of the utility model; circuit structure is: behind anodal and one end of connecting resistance R7 and one end of resistance R 11 of diode D1, be connected with power input P1, behind one end of the negative pole of described diode D1 connecting resistance R4, one end of resistance R 1, one end of resistance R 2, one end of the negative pole of voltage stabilizing didoe DW2, resistance R 3 and one end of capacitor C 1, be connected with the source electrode of P channel-type field effect transistor Q1.
The other end of described resistance R 4 also connects the negative pole of controlled voltage stabilizing didoe DW3, be connected with the negative input end a2 of comparator U1 behind one end of the reference utmost point of controlled voltage stabilizing didoe DW3 and capacitor C 4, the equal ground connection of the other end of the positive pole of described controlled voltage stabilizing didoe DW3 and capacitor C 4; The other end of described resistance R 1 is connected with the negative pole of voltage stabilizing didoe DW1, behind one end of the anodal shunt-wound capacitance C2 of described voltage stabilizing didoe DW1, is connected with the cathode power supply end of comparator U1, and the other end ground connection of described capacitor C 2; Behind one end of one end of the other end of described resistance R 2 connecting resistance R5 and resistance R 10, be connected with the output of comparator U1, the other end of described resistance R 10 is connected with the base stage of NPN type triode Q2.
Anodal and the other end of connecting resistance R3 of described voltage stabilizing didoe DW2 is, be connected with the grid of P channel-type field effect transistor Q1 behind one end of the other end of capacitor C 1 and resistance R 6, the other end of described resistance R 6 is connected with the collector electrode of NPN type triode Q2, the grounded emitter of described NPN type triode Q2, the drain electrode of described P channel-type field effect transistor Q1 is power output end P2.
After the other end of one end of one end of one end of the other end of described resistance R 7 connecting resistance R8, resistance R 9, capacitor C 3 and resistance R 5, be connected with the positive input terminal a1 of comparator U1, the other end of described resistance R 8 is connected with the second binding post d2, the equal ground connection of the other end of the other end of described resistance R 9 and capacitor C 3, the negative power supply end ground connection of described comparator U1.
Behind one end of one end of the other end of described resistance R 11 connecting resistance R12 and capacitor C 5, be connected with the negative input end b2 of comparator U2, the equal ground connection of the other end of the other end of described resistance R 12 and capacitor C 5, behind the positive input terminal b1 of described comparator U2 one end of connecting resistance R13, be connected with the positive pole of diode D2, the other end of described resistance R 13 is connected with+12V power end, described+12V power end is a 12V stabilized voltage power supply independently, can adopt a stabilized voltage power supply chip power supply; The negative pole of described diode D2 and connect the output of comparator U2 after be connected with the first binding post d1, described the 3rd binding post d3 ground connection, use the wire jumper can the above-mentioned binding post of short circuit, the utility model use time, the first binding post d1 and the second binding post d2 need be communicated with.
Above-mentioned resistance R 11 and resistance R 12 dividing potential drops gather the input voltage vin of power input P1; when the voltage of the negative input end b2 of comparator U2 is during lower than the voltage of the positive input terminal b1 of comparator U2; input voltage vin is 12V system; otherwise be 24V system; above-mentioned comparator U2 is for detection of Vehicular power supply system voltage, and comparator U1 is for detection of under-voltage protection voltage.
When the voltage of the negative input end b2 of comparator U2 is during lower than the voltage of the positive input terminal b1 of comparator U2, comparator U2 is output as high-impedance state, the voltage of the positive input terminal a1 of comparator U1 is (Vin*R15/ (R7+R15)), when the voltage of the negative input end b2 of comparator U2 is during lower than the voltage of the positive input terminal b1 of comparator U2, comparator U2 is output as low, the voltage of the positive input terminal a1 of comparator U1 is Vin* (R15//R16)/(R7+ (R15//R16), it is benchmark that described comparator U1 be take the voltage of controlled voltage stabilizing didoe DW3, be the voltage of the negative input end a2 of comparator U1, compare with the voltage of the positive input terminal a1 of comparator U1, when the voltage of the positive input terminal a1 of comparator U1 voltage higher than the negative input end a2 of comparator U1, be battery voltage higher than set protection voltage time, comparator U1 exports high level, NPN type triode Q2 conducting, P channel-type field effect transistor Q1 conducting, otherwise when battery voltage declines, when the voltage of the positive input terminal a1 of comparator U1 voltage lower than the negative input end a2 of comparator U1, comparator U1 exports low storage battery, NPN type triode Q2 cut-off, the output of P channel-type field effect transistor Q1 power cutoff, prevents that power supply from exhausting.
The utlity model has voltage detecting function, electric pressure that can automatic decision input power, has lock function to 24V voltage detecting, can prevent from that 24V supply voltage from dropping within the scope of 12V supply voltage to cause fault; There is magnetic hysteresis defencive function, when input voltage is lower than protection voltage, the output of circuit power cutoff, if power-on output, supply voltage must be higher than the low electric protection voltage of setting, mains fluctuations in the time of can preventing circuit protection like this and make power supply output unstable; Possesses manual mode function, the supply voltage that can need protect by jumper settings, if wire jumper short circuit the second binding post d2 and the 3rd binding post d3, comparator U2 is output as low, the power supply that is equivalent to detect is 24V storage battery, if the first binding post d1, the second binding post d2 and the 3rd binding post d3 standard-sized sheet road, comparator U2 is output as high-impedance state, and the power supply that is equivalent to detect is 12V storage battery; The utility model circuit structure is succinct, and oneself power consumption is low, without impact, practical on vehicle accumulator.
By reference to the accompanying drawings embodiment of the present utility model is explained in detail above, but the utility model is not limited to above-described embodiment, in the ken possessing those of ordinary skills, can also under the prerequisite that does not depart from the utility model aim, make a variety of changes.
Claims (1)
1. the protective circuit of an adaptive vehicle supply voltage, it is characterized in that: circuit structure is: behind anodal and one end of connecting resistance R7 and one end of resistance R 11 of diode D1, be connected with power input P1, behind one end of the negative pole of described diode D1 connecting resistance R4, one end of resistance R 1, one end of resistance R 2, one end of the negative pole of voltage stabilizing didoe DW2, resistance R 3 and one end of capacitor C 1, be connected with the source electrode of P channel-type field effect transistor Q1;
The other end of described resistance R 4 also connects the negative pole of controlled voltage stabilizing didoe DW3, be connected with the negative input end a2 of comparator U1 behind one end of the reference utmost point of controlled voltage stabilizing didoe DW3 and capacitor C 4, the equal ground connection of the other end of the positive pole of described controlled voltage stabilizing didoe DW3 and capacitor C 4; The other end of described resistance R 1 is connected with the negative pole of voltage stabilizing didoe DW1, behind one end of the anodal shunt-wound capacitance C2 of described voltage stabilizing didoe DW1, is connected with the cathode power supply end of comparator U1, and the other end ground connection of described capacitor C 2; Behind one end of one end of the other end of described resistance R 2 connecting resistance R5 and resistance R 10, be connected with the output of comparator U1, the other end of described resistance R 10 is connected with the base stage of NPN type triode Q2;
Anodal and the other end of connecting resistance R3 of described voltage stabilizing didoe DW2 is, be connected with the grid of P channel-type field effect transistor Q1 behind one end of the other end of capacitor C 1 and resistance R 6, the other end of described resistance R 6 is connected with the collector electrode of NPN type triode Q2, the grounded emitter of described NPN type triode Q2, the drain electrode of described P channel-type field effect transistor Q1 is power output end P2;
After the other end of one end of one end of one end of the other end of described resistance R 7 connecting resistance R8, resistance R 9, capacitor C 3 and resistance R 5, be connected with the positive input terminal a1 of comparator U1, the other end of described resistance R 8 is connected with the second binding post d2, the equal ground connection of the other end of the other end of described resistance R 9 and capacitor C 3, the negative power supply end ground connection of described comparator U1;
Behind one end of one end of the other end of described resistance R 11 connecting resistance R12 and capacitor C 5, be connected with the negative input end b2 of comparator U2, the equal ground connection of the other end of the other end of described resistance R 12 and capacitor C 5, behind the positive input terminal b1 of described comparator U2 one end of connecting resistance R13, be connected with the positive pole of diode D2, the other end of described resistance R 13 is connected with+12V power end; The negative pole of described diode D2 and connect the output of comparator U2 after be connected with the first binding post d1, described the 3rd binding post d3 ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320644587.0U CN203553911U (en) | 2013-10-19 | 2013-10-19 | Protection circuit capable of automatically adapting to vehicle power supply voltage |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320644587.0U CN203553911U (en) | 2013-10-19 | 2013-10-19 | Protection circuit capable of automatically adapting to vehicle power supply voltage |
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| CN203553911U true CN203553911U (en) | 2014-04-16 |
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| CN201320644587.0U Expired - Fee Related CN203553911U (en) | 2013-10-19 | 2013-10-19 | Protection circuit capable of automatically adapting to vehicle power supply voltage |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103560492A (en) * | 2013-10-19 | 2014-02-05 | 国家电网公司 | Self-adapting vehicle power supply voltage protection circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103560492A (en) * | 2013-10-19 | 2014-02-05 | 国家电网公司 | Self-adapting vehicle power supply voltage protection circuit |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140416 Termination date: 20171019 |
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| CF01 | Termination of patent right due to non-payment of annual fee |