CN203536933U - Overvoltage protection circuit used in vehicle controller - Google Patents
Overvoltage protection circuit used in vehicle controller Download PDFInfo
- Publication number
- CN203536933U CN203536933U CN201320719935.6U CN201320719935U CN203536933U CN 203536933 U CN203536933 U CN 203536933U CN 201320719935 U CN201320719935 U CN 201320719935U CN 203536933 U CN203536933 U CN 203536933U
- Authority
- CN
- China
- Prior art keywords
- comparator
- power supply
- resistance
- voltage
- vehicle controller
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000002045 lasting effect Effects 0.000 abstract description 4
- 230000002401 inhibitory effect Effects 0.000 abstract 1
- 230000005669 field effect Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 101100102627 Oscarella pearsei VIN1 gene Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Landscapes
- Protection Of Static Devices (AREA)
Abstract
The utility model discloses an overvoltage protection circuit used in a vehicle controller. The overvoltage protection circuit is connected to a power supply circuit of the vehicle controller. The overvoltage protection circuit comprises a comparator, wherein a normal phase input terminal of the comparator is connected to a vehicle power supply voltage terminal of the power supply circuit of the vehicle controller, a reversed phase input terminal of the comparator is connected with a 5V power supply, and an output terminal of the comparator is connected to an output signal terminal of the power supply circuit of the vehicle controller. The overvoltage protection circuit is not restricted by an overvoltage generation time, thus can be used for inhibiting high voltages lasting for milliseconds, as well as high voltages lasting for seconds, so that a power supply system of the vehicle controller is protected effectively, and a reliability of the vehicle controller is improved greatly.
Description
Technical field
The utility model relates to new forms of energy hybrid power field, is specifically related to a kind of overvoltage crowbar of system entire car controller power supply protection.
Background technology
The electric power system of new forms of energy hybrid power passenger car need to provide power supply to the various controllers of car load, and its voltage stability is extremely important, if short time overvoltage, in the situation that controller is not protected, very easily damages the power supply circuits of controller.
The overvoltage protection of normal conditions controller is TVS pipe in parallel in power supply input circuit simply just, and TVS pipe can suppress the high pressure (in millisecond) that moment produces effectively, but cannot suppress to reach the lasting high pressure of several seconds.The puncture voltage of general TVS pipe can reach hectovolt, but normal working voltage is in order to mate with car load electric power system, only selects between 30-40V.And reach lasting high voltage of several seconds, TVS pipe can be punctured.Cannot guarantee that controller works reliably.
Utility model content
The purpose of this utility model is to overcome the above problem that prior art exists; a kind of overvoltage crowbar for entire car controller is provided; utilize the power supply step-down reference comparison voltages of device as a comparison; and the current car load supply power voltage of Real-Time Monitoring, and then judge the whether overvoltage of current supply power voltage.
For realizing above-mentioned technical purpose, reach above-mentioned technique effect, the utility model is achieved through the following technical solutions:
A kind of overvoltage crowbar for entire car controller; be connected in entire car controller power supply circuits; comprise a comparator; comparator normal phase input end is connected in the car load supply power voltage end of described entire car controller power supply circuits; comparator inverting input is connected in 5V power supply, and comparator output terminal is connected in the output signal end of described entire car controller power supply circuits.
Further, described car load supply power voltage end connect the first resistance, the second resistance ground connection, described comparator normal phase input end is connected between the first resistance and the second resistance; Described 5V power supply series connection the 3rd resistance, the 4th resistance ground connection, described comparator inverting input is connected between described the 3rd resistance and the 4th resistance by the 5th resistance.
Further, described comparator output terminal is connected in described 5V power supply by pull-up resistor.
Further, described comparator normal phase input end is connected by the 6th resistance with described comparator output terminal.
The beneficial effects of the utility model are:
1, the time range that this circuit is not produced overvoltage limits, and both can suppress the high pressure of several milliseconds, can effectively suppress equally again to continue the high pressure of several seconds, therefore can effectively protect entire car controller power-supply system, greatly improves the unfailing performance of entire car controller work.
2, this overvoltage crowbar adopts high-precision voltage comparator; adopt the 5V voltage of inner reduction voltage circuit generation as standard comparative voltage; can detect rapidly and accurately current input voltage value, and carry out over-voltage suppression, effectively protect entire car controller electric power system circuit.
Above-mentioned explanation is only the general introduction of technical solutions of the utility model, in order to better understand technological means of the present utility model, and can be implemented according to the content of specification, below with preferred embodiment of the present utility model and coordinate accompanying drawing to be described in detail as follows.Embodiment of the present utility model is provided in detail by following examples and accompanying drawing thereof.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide further understanding of the present utility model, forms the application's a part, and schematic description and description of the present utility model is used for explaining the utility model, does not form improper restriction of the present utility model.In the accompanying drawings:
Fig. 1 entire car controller power supply circuits;
Fig. 2 overvoltage crowbar for entire car controller described in the utility model.
Embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the utility model in detail.
Shown in Fig. 1, Fig. 2; a kind of overvoltage crowbar for entire car controller; be connected in entire car controller power supply circuits; comprise a comparator U1; comparator U1 normal phase input end is connected in the car load supply power voltage end VIN2 of described entire car controller power supply circuits; comparator U1 inverting input is connected in 5V power supply, and comparator U1 output is connected in the output signal end VIN_TEST of described entire car controller power supply circuits.
Described car load supply power voltage end VIN2 connect the first resistance R 1, the second resistance R 2 ground connection, described comparator U1 normal phase input end is connected between the first resistance R 1 and the second resistance R 2; Described 5V power supply series connection the 3rd resistance R 3, the 4th resistance R 4 ground connection, described comparator U1 inverting input is connected between described the 3rd resistance R 3 and the 4th resistance R 4 by the 5th resistance R 5.Described comparator U1 output is connected in described 5V power supply by pull-up resistor R0.Described comparator U1 normal phase input end is connected by the 6th resistance R 6 with described comparator U1 output.
The general introduction of circuit overall plan:
Over-voltage detection circuit master chip---comparator U1 adopts LM139 comparator, and the 5V power supply that the power supply reduction voltage circuit in controller produces carries out dividing potential drop and obtains a reference comparison voltages; Gather car load supply power voltage and carry out dividing potential drop as being compared voltage, supply power voltage threshold values is made as to 32V, when supply power voltage surpasses 32V, comparator can produce level signal the MOS chip in supply access is turn-offed to control, when the supply power voltage that makes to enter controller maintains 32V; When voltage is during lower than 32V, the control of MOS chip is cancelled.
Circuit is specifically implemented to describe:
Comparator principle: comparator U1 has two inputs: in-phase input end and inverting input, and an output.When in-phase input end voltage is during higher than anti-phase input terminal voltage, output is open-drain output, i.e. vacant state.When in-phase input end voltage is during lower than anti-phase input terminal voltage, output output low level, i.e. GND.
The reference comparison voltages of comparator is set, shown in Fig. 2
The 5V power supply that entire car controller power circuit produces carries out the 3rd resistance R 3 and the 4th resistance R 4 dividing potential drops, obtains 2.5V voltage and receive comparator U1 inverting input, the as a comparison reference comparison voltages of device U1 after dividing potential drop.
Gather car load supply power voltage, shown in Fig. 2,
Car load supply power voltage end VIN2, by the first resistance R 10 and the second resistance R 2, carry out dividing potential drop, comparator U1 in-phase input end is connected between the first resistance R 10 and the second resistance R 2, according to Ohm's law, calculate known, when VIN2=32V, the voltage that is input to comparator U1 in-phase input end is about 2.5V, equals reference comparison voltages.When comparator U1 in-phase input end voltage is less than 2.5V, car load supply power voltage end VIN2 is less than 32V.Otherwise car load supply power voltage end VIN2 is greater than 32V.
Controller supply access suppresses voltage
When car load supply power voltage end VIN2 is during higher than 32V, comparator U1 in-phase input end is less than inverting input, and output is open-drain output, i.e. vacant state.But output is owing to there being pull-up resistor R0, the actual output of output signal end VIN_TEST 5V.This 5V signal controlling the 3rd triode Q3 conducting, makes the base stage of the second triode Q2 and collector electrode form pressure drop, the second also conducting of triode Q2.A point and B point UNICOM, field effect transistor Q1 is because GS level is without pressure reduction, and field effect transistor Q1 ends, and now, the first car load supply power voltage end VIN1 can not enter car load supply power voltage end VIN2 place.
Supply access returns to form
When car load supply power voltage end VIN2 is during lower than 32V, comparator U1 in-phase input end voltage is during lower than anti-phase input terminal voltage, output output low level, and output signal end VIN_TEST signal is GND.The 3rd triode Q3 cut-off, the second triode Q2 also ends, field effect transistor Q1 normally.Car load power supply is sent into the power-supply system of controller inside by field effect transistor Q1.
Therefore, provide a kind of reliable in the utility model patent, overvoltage crowbar, adopts voltage comparator chip accurately, in real time the power supply of input control device is detected, relatively; When produce higher than 32V voltage time, hardware circuit is controlled voltage input channel voluntarily, the high voltage that moment produces can be suppressed at below 32V, thereby guarantee the work of entire car controller normal reliable ground.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection range of the present utility model.
Claims (4)
1. the overvoltage crowbar for entire car controller; be connected in entire car controller power supply circuits; it is characterized in that: comprise a comparator (U1); comparator (U1) normal phase input end is connected in the car load supply power voltage end (VIN2) of described entire car controller power supply circuits; comparator (U1) inverting input is connected in 5V power supply, and comparator (U1) output is connected in the output signal end (VIN_TEST) of described entire car controller power supply circuits.
2. the overvoltage crowbar for entire car controller according to claim 1, it is characterized in that: described car load supply power voltage end (VIN2) series connection the first resistance (R1), the second resistance (R2) ground connection, described comparator (U1) normal phase input end is connected between the first resistance (R1) and the second resistance (R2); Described 5V power supply series connection the 3rd resistance (R3), the 4th resistance (R4) ground connection, described comparator (U1) inverting input is connected between described the 3rd resistance (R3) and the 4th resistance (R4) by the 5th resistance (R5).
3. the overvoltage crowbar for entire car controller according to claim 1, is characterized in that: described comparator (U1) output is connected in described 5V power supply by pull-up resistor (R0).
4. the overvoltage crowbar for entire car controller according to claim 1, is characterized in that: described comparator (U1) normal phase input end is connected by the 6th resistance (R6) with described comparator (U1) output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320719935.6U CN203536933U (en) | 2013-11-15 | 2013-11-15 | Overvoltage protection circuit used in vehicle controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320719935.6U CN203536933U (en) | 2013-11-15 | 2013-11-15 | Overvoltage protection circuit used in vehicle controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203536933U true CN203536933U (en) | 2014-04-09 |
Family
ID=50423109
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320719935.6U Expired - Lifetime CN203536933U (en) | 2013-11-15 | 2013-11-15 | Overvoltage protection circuit used in vehicle controller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203536933U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106357111A (en) * | 2016-09-28 | 2017-01-25 | 北京新能源汽车股份有限公司 | On-vehicle DC/DC output voltage's feedback circuit and electric automobile |
-
2013
- 2013-11-15 CN CN201320719935.6U patent/CN203536933U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106357111A (en) * | 2016-09-28 | 2017-01-25 | 北京新能源汽车股份有限公司 | On-vehicle DC/DC output voltage's feedback circuit and electric automobile |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205545179U (en) | IGBT overflows detection circuitry and current foldback circuit | |
| CN204287446U (en) | A kind of power-fail detection circuit | |
| CN202634383U (en) | Power switch and overvoltage power-off controller thereof | |
| CN104393559A (en) | Load overcurrent protection circuit for electric power | |
| CN203645292U (en) | An overvoltage over-current protection circuit | |
| CN204068199U (en) | A kind of under-voltage surge current protection circuit | |
| CN102723693B (en) | Load protection circuit and method for electric tool | |
| CN203536933U (en) | Overvoltage protection circuit used in vehicle controller | |
| CN203491680U (en) | Automatic reset electric leakage overvoltage/undervoltage protection circuit | |
| CN206057425U (en) | The adjustable DC voltage detecting system of marginal range | |
| CN103346546A (en) | Lightning protection circuit used for remote measurement terminal | |
| CN209299522U (en) | The detection circuit of the external car microphone of T-BOX, vehicle-mounted T-BOX | |
| CN203069654U (en) | Power failure detection circuit | |
| CN203377584U (en) | Three-phase non-midline phase-lack, undervoltage and overvoltage protection circuit | |
| CN203398784U (en) | Reversal connection protection circuit of battery charging circuit | |
| CN105322499B (en) | A kind of short-circuit protection circuit abnormal based on power source loads | |
| CN203504786U (en) | Electromagnetic heating control circuit and electric pressure cooker | |
| CN208226561U (en) | A kind of Drive Protecting Circuit of vehicle electronic control unit | |
| CN203027234U (en) | Power device drive circuit with detection function | |
| CN103346545A (en) | Telemetering terminal electrostatic protection circuit | |
| CN104638599A (en) | Vehicle USB interface circuit power supply protector | |
| CN205726196U (en) | A kind of terrestrial broadcasting Set Top Box TUNER power supply circuits | |
| CN207148219U (en) | A kind of resistance detecting circuit of anti-reverse, anti-temperature drift | |
| CN202421460U (en) | Motor locked-rotor detection device of vehicle | |
| CN110912105A (en) | High-low voltage protection circuit for power supply voltage range detection |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140409 |