CN104009447A - Vehicle-mounted overvoltage protection circuit - Google Patents
Vehicle-mounted overvoltage protection circuit Download PDFInfo
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- CN104009447A CN104009447A CN201310061268.1A CN201310061268A CN104009447A CN 104009447 A CN104009447 A CN 104009447A CN 201310061268 A CN201310061268 A CN 201310061268A CN 104009447 A CN104009447 A CN 104009447A
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Abstract
The invention is applied to the field of automobile electronics, and provides a vehicle-mounted overvoltage protection circuit which is connected with the output end of one or more voltage stabilization modules. The vehicle-mounted overvoltage protection circuit comprises a detection module, a switch tube and a power control module. The detection module is connected with the output end of the voltage stabilization module for detecting the one or more voltage stabilization modules; the control end of the switch tube is connected with the detection module, and a low-potential end is grounded; and the controlled end of the power control module is connected with a DC source and the high-potential end of the switch tube, an input end is connected with the DC source, and an output end is connected with the voltage stabilization module. By using the vehicle-mounted overvoltage protection circuit, the output voltages of the one or more voltage stabilization modules can be detected, if it is detected that one output voltage exceeds a preset value, the switch tube is conducted to enable the potential of the control end of the power control module to be lowered so as to enable the power control module to be broken, thus an input power can be timely broken to protect a subsequent circuit from being damaged when a fault occurs in the voltage stabilization module.
Description
Technical field
The invention belongs to vehicle electric field, relate in particular to a kind of vehicle-mounted overvoltage crowbar.
Background technology
Indirectly provide by the battery on car or generator at the input power of vehicle-carrying DVD (Digital Video Disk, Digital video disc) player and navigation system, this input supply voltage is between 11V～16V.
At present, the low-voltage circuit (5V is following) of conventional DVD player on vehicle and navigation system and the required power supply of integrated circuit all pass through DC-DC(direct current and straighten stream) form above-mentioned input power is converted to, and most low-voltage circuit and integrated circuit all can not bear voltage more than 9V.Once so DC-DC circuit damages, or peripheral devices goes wrong, by causing, the input voltage of low-voltage circuit and integrated circuit is too high, forms the permanent damage of burning.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of vehicle-mounted overvoltage crowbar, solves vehicle-mounted transforming circuit damage and will be directly follow-up low-voltage circuit and device be caused to the problem of damage if be intended to.
The embodiment of the present invention is achieved in that a kind of vehicle-mounted overvoltage crowbar, is connected with the output of one or more Voltage stabilizing modules, and described vehicle-mounted overvoltage crowbar comprises detection module, switching tube and energy supply control module, wherein,
Described detection module is connected with the output of described Voltage stabilizing module, detects output voltage the output detections voltage of one or more described Voltage stabilizing modules;
The control end of described switching tube is connected with described detection module, cold end ground connection, when described detection voltage exceedes predetermined value described in switching tube conducting;
The controlled end of described energy supply control module is connected with the hot end of DC power supply and described switching tube respectively, the input of described energy supply control module is connected with described DC power supply, and the output of described energy supply control module and the input of described Voltage stabilizing module are connected, when the controlled end of described energy supply control module accesses low level, between its input and its output, open circuit.
Above-mentioned vehicle-mounted overvoltage crowbar can detect the output voltage of one or more Voltage stabilizing modules by detection module; if detect when any one output voltage exceedes preset value, switching tube is with regard to conducting; the control end current potential of energy supply control module is dragged down; thereby make to open circuit between the input of energy supply control module and its output; Voltage stabilizing module is closed, and has realized thus and in the time that Voltage stabilizing module breaks down, can disconnect in time its input power to protect its subsequent conditioning circuit not damaged.
Brief description of the drawings
Fig. 1 is the module map of the vehicle-mounted overvoltage crowbar that provides of the embodiment of the present invention;
Fig. 2 is the circuit theory diagrams of the vehicle-mounted overvoltage crowbar that provides of one embodiment of the invention;
Fig. 3 is the circuit theory diagrams of the vehicle-mounted overvoltage crowbar that provides of another embodiment of the present invention.
Embodiment
In order to make the technical problem to be solved in the present invention, technical scheme and beneficial effect clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
As shown in Figure 1; a kind of vehicle-mounted overvoltage crowbar 200; be connected with the output of one or more Voltage stabilizing modules 100; vehicle-mounted overvoltage crowbar 200 detects the output voltage of Voltage stabilizing module 100; disconnect the input of Voltage stabilizing module 100 and being connected of DC power supply 300 if this output voltage exceedes the subsequent conditioning circuit (routine low-voltage circuit described above and integrated circuit) of Voltage stabilizing module 100, DC power supply 300 is battery or the generator on car.Vehicle-mounted overvoltage crowbar 200 comprises detection module 202, switching tube 204 and energy supply control module 206.
Detection module 202 is connected with the output of Voltage stabilizing module 100, detects output voltage the output detections voltage of one or more Voltage stabilizing modules 100; The control end of switching tube 204 is connected with detection module 202, cold end ground connection, switching tube 204 conductings when detection voltage exceedes predetermined value; The controlled end of energy supply control module 206 is connected with the hot end of DC power supply 300 and switching tube 204 respectively, being connected with DC power supply 300 of energy supply control module 206, and the output of energy supply control module 206 is connected with the input of Voltage stabilizing module 100, when the controlled end of energy supply control module 206 accesses low level, between its input and its output, open circuit.
Above-mentioned vehicle-mounted overvoltage crowbar 200 can detect the output voltage of one or more Voltage stabilizing modules 100 by detection module 202; if detect when any one output voltage exceedes preset value, switching tube 204 is with regard to conducting; the control end current potential of energy supply control module 206 is dragged down; thereby make to open circuit between the input of energy supply control module 206 and its output; Voltage stabilizing module 100 is closed, and has realized thus and in the time that Voltage stabilizing module 100 breaks down, can disconnect in time its input power to protect its subsequent conditioning circuit not damaged.
With reference to figure 2, in a preferred embodiment, detection module 202 comprises diode D1, quantity current-limiting resistance R1 and the current-limiting resistance R2 identical with diode D1 number that quantity is identical with Voltage stabilizing module 100.Shown in Fig. 2 is the embodiment of two Voltage stabilizing modules 100, two diode D1 and two current-limiting resistance R1.
The anode of diode D1 is connected with the output of corresponding Voltage stabilizing module 100, the negative electrode of diode is connected with the first end of corresponding current-limiting resistance R1, the second end of all current-limiting resistance R1 is connected with the control end of switching tube 204 as the output of detection module 202, and through current-limiting resistance R2 ground connection.Be appreciated that according to the conducting voltage of different switching tubes 204, the predetermined value that detects voltage can regulate to adjust by potential-divider network current-limiting resistance R1 and current-limiting resistance R2 the different output voltage of detection module 202.In vehicle-carrying DVD and navigation system circuit, the predetermined value that detects voltage can be arranged between 6.5V～7.5V.
In present embodiment, the magnitude setting diode D1 identical with Voltage stabilizing module 100 as the test side of detection module 202 to detect corresponding Voltage stabilizing module 100, object is to detect the output voltage of multiple Voltage stabilizing modules 100 and phase mutual interference again simultaneously, break down thereby realize any one or more Voltage stabilizing modules 100, when its output voltage exceedes the predetermined value that detects voltage, just can disconnect the circuit of Voltage stabilizing module 100 and DC power supply 300.
Further, detection module 202 also comprises the voltage stabilizing didoe D2 that quantity is identical with diode D1 number, the negative electrode of voltage stabilizing didoe D2 is connected with the negative electrode of corresponding diode D1, and the anode of voltage stabilizing didoe D2 is connected with the first end of corresponding current-limiting resistance R1.Can relax the adjusting of above-mentioned potential-divider network by voltage stabilizing didoe D2 is set, utilize the reverse breakdown voltage of voltage stabilizing didoe D2 that the predetermined value of above-mentioned detection voltage can be set.
In a preferred embodiment, switching tube 204 is thyristor, and the control end of switching tube 204, cold end, hot end are followed successively by gate pole, negative electrode, the anode of thyristor.In the present embodiment; thyristor can be realized because of Voltage stabilizing module 100 break down (thyristor conducting) while closing; and because the anode of thyristor is to be directly connected with DC power supply 300; it still can keep conducting state in the time that Voltage stabilizing module 100 is closed, and ensures that above-mentioned subsequent conditioning circuit can keep guard mode.In other embodiments, switching tube 204 can be replaced with having with the integrated chip of the identical operation principle of thyristor.
In a preferred embodiment, energy supply control module 206 comprises the first gate-controlled switch Q1, the second gate-controlled switch Q2, divider resistance R3, divider resistance R4, divider resistance R5 and divider resistance R6.
The control end of the first gate-controlled switch Q1 is connected with the hot end of switching tube 204, and is connected with DC power supply 300 by divider resistance R3, and by divider resistance R4 ground connection; The input of the first gate-controlled switch Q1 is connected with the control end of the second gate-controlled switch Q2 through divider resistance R5, and the control end of the second gate-controlled switch Q2 connects through divider resistance R6 DC power supply 300, the output head grounding of the first gate-controlled switch Q1; The input of the second gate-controlled switch Q2 is connected with DC power supply 300 as the input of energy supply control module 206, the output of the second gate-controlled switch Q2 is connected with the input of Voltage stabilizing module 100 as the output of energy supply control module 206, and one end that divider resistance R3 is connected with the hot end of switching tube 204 is as the controlled end of energy supply control module 206.
More specifically, energy supply control module 206 also comprises divider resistance R7, divider resistance R7, divider resistance R3 and divider resistance R4 series connection, and the control end of the first gate-controlled switch Q1 is connected with DC power supply 300 with divider resistance R3 through the divider resistance R7 of series connection.
In a preferred embodiment, the first gate-controlled switch Q1 is NPN type triode or N-type metal-oxide-semiconductor (with reference to figure 3), wherein, the control end of the first gate-controlled switch Q1, input, output are followed successively by base stage, collector electrode, the emitter of NPN type triode, or are followed successively by grid, drain electrode, the source electrode of N-type metal-oxide-semiconductor.
In a preferred embodiment, the second gate-controlled switch Q2 is P type metal-oxide-semiconductor or positive-negative-positive triode (with reference to figure 3), the control end of the second gate-controlled switch Q2, input, output are followed successively by grid, source electrode, the drain electrode of P type metal-oxide-semiconductor, or are followed successively by grid, source electrode, the drain electrode of positive-negative-positive triode.
Below in conjunction with Fig. 2, the operation principle of vehicle-mounted overvoltage crowbar 200 is described with one of them embodiment.
If Voltage stabilizing module 100 breaks down; make its output voltage higher than the predetermined value that detects voltage; it is the conducting voltage that the voltage of the loading of divider resistance R2 reaches thyristor; thyristor conducting; the voltage that causes divider resistance R4 and divider resistance R7 to load is zero; thereby first not conducting of control switch Q1 the second not conducting of control switch Q2, all Voltage stabilizing module 100 no-voltages inputs and closing, time Voltage stabilizing module 100 subsequent conditioning circuit protected.Again because the self character of thyristor; the anode of thyristor is to be directly connected with DC power supply 300; it still can keep conducting state; ensure that above-mentioned subsequent conditioning circuit can keep guard mode, realized thus and in the time that Voltage stabilizing module 100 breaks down, can disconnect in time its input power to protect its subsequent conditioning circuit not damaged.
In an embodiment of the present invention; above-mentioned vehicle-mounted overvoltage crowbar 200 can detect the output voltage of one or more Voltage stabilizing modules 100 by detection module 202; if detect when any one output voltage exceedes preset value, switching tube 204 is with regard to conducting; the control end current potential of energy supply control module 206 is dragged down; thereby make to open circuit between the input of energy supply control module 206 and its output; Voltage stabilizing module 100 is closed, and has realized thus and in the time that Voltage stabilizing module 100 breaks down, can disconnect in time its input power to protect its subsequent conditioning circuit not damaged.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (6)
1. a vehicle-mounted overvoltage crowbar, is connected with the output of one or more Voltage stabilizing modules, it is characterized in that, described vehicle-mounted overvoltage crowbar comprises detection module, switching tube and energy supply control module, wherein,
Described detection module is connected with the output of described Voltage stabilizing module, detects output voltage the output detections voltage of one or more described Voltage stabilizing modules;
The control end of described switching tube is connected with described detection module, cold end ground connection, when described detection voltage exceedes predetermined value described in switching tube conducting;
The controlled end of described energy supply control module is connected with the hot end of DC power supply and described switching tube respectively, the input of described energy supply control module is connected with described DC power supply, and the output of described energy supply control module and the input of described Voltage stabilizing module are connected, when the controlled end of described energy supply control module accesses low level, between its input and its output, open circuit.
2. vehicle-mounted overvoltage crowbar as claimed in claim 1, is characterized in that, described switching tube is thyristor, and the control end of described switching tube, cold end, hot end are followed successively by gate pole, negative electrode, the anode of described thyristor.
3. vehicle-mounted overvoltage crowbar as claimed in claim 1 or 2, is characterized in that, described detection module comprises diode D1, quantity current-limiting resistance R1 and the current-limiting resistance R2 identical with described diode D1 that quantity is identical with described Voltage stabilizing module, wherein,
The anode of described diode D1 is connected with the output of corresponding described Voltage stabilizing module, the negative electrode of described diode is connected with the first end of corresponding described current-limiting resistance R1, the second end of all described current-limiting resistance R1 is connected as the output of described detection module and the control end of described switching tube, and through described current-limiting resistance R2 ground connection.
4. vehicle-mounted overvoltage crowbar as claimed in claim 3; it is characterized in that; described detection module also comprises the voltage stabilizing didoe D2 that quantity is identical with described diode D1 number; the negative electrode of described voltage stabilizing didoe D2 is connected with the negative electrode of corresponding diode D1, and the anode of described voltage stabilizing didoe D2 is connected with the first end of corresponding described current-limiting resistance R1.
5. vehicle-mounted overvoltage crowbar as claimed in claim 1, is characterized in that, described energy supply control module comprises the first gate-controlled switch Q1, the second gate-controlled switch Q2, divider resistance R3, divider resistance R4, divider resistance R5 and divider resistance R6, wherein,
Described the first control end of gate-controlled switch Q1 and the hot end of described switching tube are connected, and are connected with described DC power supply by described divider resistance R3, and by described divider resistance R4 ground connection;
The input of described the first gate-controlled switch Q1 is connected with the control end of described the second gate-controlled switch Q2 through described divider resistance R5, the control end of described the second gate-controlled switch Q2 connects through DC power supply described in described divider resistance R6, the output head grounding of described the first gate-controlled switch Q1;
The input of described the second gate-controlled switch Q2 is connected with described DC power supply, and described the second output of gate-controlled switch Q2 and the input of described Voltage stabilizing module are connected.
6. vehicle-mounted overvoltage crowbar as claimed in claim 5, it is characterized in that, described the first gate-controlled switch Q1 is NPN type triode or N-type metal-oxide-semiconductor, wherein, the control end of described the first gate-controlled switch Q1, input, output are followed successively by base stage, collector electrode, the emitter of described NPN type triode, or are followed successively by grid, drain electrode, the source electrode of described N-type metal-oxide-semiconductor;
The second gate-controlled switch Q2 is P type metal-oxide-semiconductor or positive-negative-positive triode, the control end of described the second gate-controlled switch Q2, input, output are followed successively by grid, source electrode, the drain electrode of described P type metal-oxide-semiconductor, or are followed successively by grid, source electrode, the drain electrode of described positive-negative-positive triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310061268.1A CN104009447A (en) | 2013-02-27 | 2013-02-27 | Vehicle-mounted overvoltage protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310061268.1A CN104009447A (en) | 2013-02-27 | 2013-02-27 | Vehicle-mounted overvoltage protection circuit |
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| CN104009447A true CN104009447A (en) | 2014-08-27 |
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| CN201310061268.1A Pending CN104009447A (en) | 2013-02-27 | 2013-02-27 | Vehicle-mounted overvoltage protection circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104333238A (en) * | 2014-10-17 | 2015-02-04 | 重庆金宏汽车电子有限公司 | Power supply circuit for navigation device |
| CN106226681A (en) * | 2016-08-04 | 2016-12-14 | 刘超 | A kind of power circuit failure detector circuit and electronic equipment |
| CN109032045A (en) * | 2018-09-28 | 2018-12-18 | 科博达技术股份有限公司 | Vehicle-mounted high side switches |
| CN109088446A (en) * | 2017-06-14 | 2018-12-25 | 重庆无线绿洲通信技术有限公司 | Power supply unit protects circuit, car battery and power supply unit guard method |
| CN110112703A (en) * | 2019-05-17 | 2019-08-09 | 深圳市兴科荣科技有限公司 | Protect circuit |
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| US5291365A (en) * | 1991-10-22 | 1994-03-01 | Nippondenso Co., Ltd. | Power supply with overvoltage protection circuit |
| CN1716739A (en) * | 2004-06-29 | 2006-01-04 | 因芬尼昂技术股份公司 | DC voltage converter and method for converting a DC voltage |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104333238A (en) * | 2014-10-17 | 2015-02-04 | 重庆金宏汽车电子有限公司 | Power supply circuit for navigation device |
| CN106226681A (en) * | 2016-08-04 | 2016-12-14 | 刘超 | A kind of power circuit failure detector circuit and electronic equipment |
| CN109088446A (en) * | 2017-06-14 | 2018-12-25 | 重庆无线绿洲通信技术有限公司 | Power supply unit protects circuit, car battery and power supply unit guard method |
| CN109032045A (en) * | 2018-09-28 | 2018-12-18 | 科博达技术股份有限公司 | Vehicle-mounted high side switches |
| CN109032045B (en) * | 2018-09-28 | 2024-03-26 | 科博达技术股份有限公司 | Vehicle-mounted high-side switch |
| CN110112703A (en) * | 2019-05-17 | 2019-08-09 | 深圳市兴科荣科技有限公司 | Protect circuit |
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Application publication date: 20140827 |