CN113054715A - Low-cost automobile door handle power supply circuit with overload overvoltage protection function - Google Patents
Low-cost automobile door handle power supply circuit with overload overvoltage protection function Download PDFInfo
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- CN113054715A CN113054715A CN202110372287.0A CN202110372287A CN113054715A CN 113054715 A CN113054715 A CN 113054715A CN 202110372287 A CN202110372287 A CN 202110372287A CN 113054715 A CN113054715 A CN 113054715A
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- 238000005070 sampling Methods 0.000 claims abstract description 29
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 8
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 4
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 4
- 239000004065 semiconductor Substances 0.000 claims abstract description 4
- 238000001514 detection method Methods 0.000 claims description 4
- 230000003321 amplification Effects 0.000 claims description 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 3
- 238000013021 overheating Methods 0.000 abstract 1
- 230000001276 controlling effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002860 competitive effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00304—Overcurrent protection
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a low-cost automobile door handle power supply circuit with an overload and overvoltage protection function, which comprises a BAT power supply, a sampling resistor, an MOS (metal oxide semiconductor) tube, a plurality of triodes and a plurality of voltage-regulator tubes, wherein the BAT power supply is connected with the sampling resistor; the BAT power supply, the sampling resistor and the MOS tube are sequentially connected in series and connected into a power output circuit; the triode is connected to a circuit where the BAT power supply is located, and the MOS tube is controlled through the sampling resistor and the triode; when the external output is overloaded or short-circuited to the ground, the voltage at two ends of the sampling resistor is increased, and the triode is conducted to control the power MOS tube, so that the MOS tube can be protected from being damaged by overheating; the MOS tube is connected with a triode, and is sequentially connected with a voltage stabilizing tube in series and is connected into a power output circuit; when the output voltage exceeds the voltage-stabilizing value of the voltage-stabilizing tube, the voltage-stabilizing tube is reversely conducted, the trigger triode is conducted, the output power MOS tube is turned off, and the overvoltage protection effect is achieved.
Description
Technical Field
The invention relates to the field of electronic control of keyless entry of automobiles, in particular to a low-cost automobile door handle power supply circuit with an overload and overvoltage protection function.
Background
The automobile keyless entry system consists of a main module and 2 door handles, wherein the main module of the keyless entry system needs to provide power supply output for the 2 door handles, and the power supply of the whole automobile is transmitted to the door handles. The door handle is integrated with a touch sensor and a low frequency antenna, and needs to be powered for a long time. Even if the automobile is in a flameout state, the door handle cannot be powered down, and when the door handle is touched by a hand, the touch sensor can respond in time.
The design of the automobile electronic products needs to meet the requirements of ISO16750-2 international standards on the test of electronic appliances. One of the tests is a port short circuit test, which requires that the output port of the electronic product cannot be damaged by being short-circuited to the ground and the power supply for 60 s.
Referring to fig. 1, a power supply is provided for an external door handle module, and conventionally, a power supply output is controlled by controlling the on-off of a power PMOS transistor 3 through an MCU control chip 2, and an external output series resistor 4 prevents the PMOS transistor from being burnt out due to an external short circuit to the ground. As shown in fig. 1 below: the disadvantages of this design: the power output capacity is limited, the series current-limiting resistor can limit the power output capacity, and the door handle 1 cannot provide enough current for loading; secondly, the power consumption is high, when the current-limiting resistor is short-circuited, the power consumption is high, the heat productivity is large, and the resistor is easy to burn; thirdly, the resistor is required to be packaged greatly for heat dissipation, so that the cost of the resistor is increased, and the area of a PCB is increased; and fourthly, no overvoltage output protection function exists.
The other scheme is that an integrated HSD chip is adopted to control power output, and the scheme has the advantages of high IC cost, complex control, more MCU resource consumption and no competitive advantage in cost.
Therefore, how to reduce the power consumption of the circuit is a problem to be solved in the field.
Disclosure of Invention
Aiming at the technical problem of high power consumption in the prior art, the low-cost automobile door handle power supply circuit with the overload overvoltage protection function provided by the scheme controls a power supply power MOS tube by introducing a sampling resistor Rshunt and a PNP detection control triode, and well overcomes the problems in the prior art.
In order to achieve the purpose, the low-cost automobile door handle power supply circuit with the overload overvoltage protection function comprises a control chip, a second triode, a BAT power supply and an MOS (metal oxide semiconductor) tube, wherein the control chip is connected with the second triode; the circuit is characterized by also comprising a sampling resistor and a third triode;
the control chip is connected with the second triode and used for controlling the switch of the second triode;
the BAT power supply, the sampling resistor and the MOS tube are sequentially connected in series and connected into a power output circuit; the third triode is connected to a line where the BAT power supply is located, and the MOS tube is controlled through the sampling resistor and the third triode;
when the door handle normally works, the control chip controls the second triode to be opened, the grid electrode of the MOS tube is pulled down and conducted, and the power BAT is output to the outside through the MOS tube to supply power to the door handle;
when the output is overloaded or short-circuited, the output current of the power supply BAT is increased, the current flows through the sampling resistor, so that the voltages at two ends of the sampling resistor are increased, when the voltages at two ends of the sampling resistor are greater than the starting voltage of the third triode, the third triode starts to be conducted, the grid voltage of the MOS tube is pulled high, the MOS tube is in an amplification state, the output current is limited within a preset range, and the power MOS tube is ensured not to be damaged.
Furthermore, the MOS tube is connected with a fourth triode, and a fifth triode and a first voltage-regulator tube are sequentially connected in series and connected into the power output circuit;
the first voltage-regulator tube, the fourth triode and the fifth triode form an output voltage detection control circuit;
when the output voltage in the circuit exceeds the voltage stabilizing value of the first voltage stabilizing tube, the first voltage stabilizing tube is conducted reversely, redundant voltage is loaded on the base electrode of the fifth triode to be conducted, the fourth base electrode is pulled down and conducted at the same time, the grid voltage of the MOS tube is pulled up and cut off, and the output circuit is closed.
Furthermore, a second voltage-regulator tube is connected in parallel between the MOS tube grid source electrode circuits, and the MOS tube can be prevented from being damaged due to overlarge grid source electrode voltage of the MOS tube through the second voltage-regulator tube.
The low-cost area overload overvoltage protection function's car door handle supply circuit that this scheme provided, it detects the control triode through introducing a sampling resistor and a PNP and controls power MOS pipe, and sampling resistor can require to select very little resistance value according to the output load, has reduced the consumption of circuit well, greatly reduced the cost.
Drawings
The invention is further described below in conjunction with the appended drawings and the detailed description.
FIG. 1 is a schematic diagram of a power supply circuit of a conventional automobile door handle;
fig. 2 is a schematic structural diagram of the low-cost automobile door handle power supply circuit with an overload and overvoltage protection function.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.
The low-cost car door handle supply circuit with the overload and overvoltage protection function provided by the scheme is shown in fig. 2 and mainly comprises an MCU (microprogrammed control Unit) chip 100, a sampling resistor 200, an MOS (metal oxide semiconductor) tube 300, a BAT (Battery station) power supply 700, a plurality of voltage-regulator tubes, a plurality of triodes and a plurality of resistors.
In this scheme, a plurality of voltage regulators are used for stabilizing the voltage in the circuit, and a first voltage regulator 410 and a second voltage regulator 420 are included in this scheme.
The triodes are used for amplifying weak signals in the circuit into electric signals with larger amplitude values; in this embodiment, the transistors include a second transistor 510, a third transistor 520, a fourth transistor 530 and a fifth transistor 540.
The resistors are used for keeping the current magnitude in the access circuit stable, and in the scheme, the resistors comprise a first resistor 610, a second resistor 620, a third resistor 630 and a fourth resistor 640.
The first regulator 410 is disposed in the power output circuit, and is connected in series with the fifth transistor 540, and is connected to the circuit output by the power BAT 200.
A fourth resistor 640 is connected in series between the first regulator tube 410 and the fifth triode 540; a third resistor 630 is connected in series between the fifth transistor 540 and the circuit output by the BAT power supply 700, so that the magnitude of the current in the circuit can be kept stable.
The circuit output by the BAT power supply 700 is connected in series with a sampling resistor 200 and a MOS transistor 300 in sequence, and is connected to the power output circuit.
A third transistor 520 and a fourth transistor 530 are connected in parallel between the fifth transistor 540 and the output circuit of the BAT power supply 700.
A first connection terminal of the third transistor 520 is connected between the fifth transistor 540 and the output circuit of the BAT power supply 200, and a second connection terminal is connected in series with the second transistor 510.
Similarly, to ensure the stability of the circuit during operation, a second resistor 620 is connected in series between the second transistor 510 and the third transistor 520.
The input end of the second triode 510 is connected with the MCU chip 100; the MCU chip 100 is configured to control the switching of the second transistor 510.
The first connection end and the second connection end of the fourth transistor 530 are respectively connected to two ends of the third resistor 630, and the third connection end passes through a circuit where the third transistor 520 is located and is connected to the MOS transistor 300.
A second voltage regulator 420 and a first resistor 610 are connected in parallel in sequence in the output circuit of the third transistor 520 and the BAT power supply 700 and the circuit of the fourth transistor 530 and the MOS transistor 300.
A second voltage regulator tube is connected in parallel between the gate source circuits of the MOS transistors, and the second voltage regulator tube 420 is used for limiting the voltage between the gate and the source of the MOS transistor 300 and ensuring that the voltage is less than the maximum allowable value, so that the MOS transistor 300 is protected from being damaged.
The working process of the method in specific application is illustrated as follows:
when the device works normally; the MCU chip 100 controls the second triode 510 to be turned on, the gate of the power MOS tube 300 is pulled low, and the power MOS tube 300 is turned on; the BAT power supply 700 supplies power to the door handle through the MOS transistor 300 to the external output.
When the output is shorted to ground; the output current of the BAT power supply 700 is increased, and the current flows through the sampling resistor Rshunt200, so that the voltage VR-shunt at the two ends of the sampling resistor 200 is increased, when the voltage VR-shunt is greater than 0.7V, the third triode 520 starts to be conducted, the gate voltage of the MOS tube 300 is pulled high, the output current of the MOS tube 300 is limited within about 0.7/Rshunt, and the circuit is protected.
When outputting overvoltage protection; the voltage-stabilizing parameters of the first voltage-stabilizing tube 410 can be selected by itself, and the present embodiment takes 18V as an example. When the external output voltage is greater than 18.7V, the first voltage regulator tube 410 is reversely conducted, the redundant 0.7V voltage is loaded on the base of the fifth triode 540 to conduct the same, the base of the fourth triode 530 is pulled down, the fourth triode 530 is conducted, the gate voltage of the MOS tube 300 is pulled up to VBAT, the MOS tube 300 is cut off, and the output circuit is closed to be protected.
The low-cost automobile door handle power supply circuit with the overload overvoltage protection function is different from the ordinary automobile door handle power supply circuit which is subjected to current-limiting protection by a current-limiting resistor, and the design introduces a sampling resistor 200 and a third triode 520 to control a power supply power MOS tube 300.
When the output current exceeds the design threshold, the voltage generated on the sampling resistor 200 triggers the third transistor 520 to be turned on, thereby turning off the output of the power MOS transistor 300. Therefore, the sampling resistor 200 can select a very small resistance value according to the requirement of an output load, and the current output capability is strong; meanwhile, the voltage on the sampling resistor 200 is very low, and is only 0.7V at most, which means that the power consumption generated by the sampling resistor 200 is very low, and a resistor with small package and low cost can be selected.
In addition, the circuit adopts the first voltage regulator tube 410, the fourth triode 530 and the fifth triode 540 to form an output voltage detection control circuit; when the output voltage exceeds the regulated voltage value of the first regulator tube 410, the first regulator tube 410 is conducted reversely, the fourth triode 530 and the fifth triode 540 are triggered to be conducted, the output power MOS tube 300 is turned off, and the overvoltage protection effect is achieved.
The low-cost car door handle supply circuit who takes overload overvoltage protection function that this scheme provided, its logic control is simple, and is with low costs, and for prior art, there is following advantage:
(1) the door handle has a low-power-consumption output overload protection function, the overload current limit value can be flexibly designed according to the load requirement of the door handle, once the output is short-circuited to the ground or the output current exceeds the design threshold value, the circuit automatically closes the output, and the circuit device is protected from being damaged; compared with the traditional current-limiting resistor design, the design does not generate extra power loss;
(2) the output overvoltage protection function is realized, once the output voltage exceeds a design threshold value, the circuit automatically closes the output, and the external department handle module is protected;
(3) the control is simple, and only the MCU is required to provide an output of the I/O port control circuit;
(4) the PCB layout structure has the advantages of low cost, circuit design by adopting separated devices, few components, simple structure, low cost and PCB layout space saving.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (3)
1. A low-cost car door handle power supply circuit with an overload and overvoltage protection function comprises a control chip, a second triode, a BAT power supply and an MOS (metal oxide semiconductor) tube; the circuit is characterized by also comprising a sampling resistor and a third triode;
the control chip is connected with the second triode and used for controlling the switch of the second triode;
the BAT power supply, the sampling resistor and the MOS tube are sequentially connected in series and connected into a power output circuit; the third triode is connected to a line where the BAT power supply is located, and the MOS tube is controlled through the sampling resistor and the third triode;
when the door handle normally works, the control chip controls the second triode to be opened, the grid electrode of the MOS tube is pulled down and conducted, and the power BAT is output to the outside through the MOS tube to supply power to the door handle;
when the output is overloaded or short-circuited, the output current of the power supply BAT is increased, the current flows through the sampling resistor, so that the voltages at two ends of the sampling resistor are increased, when the voltages at two ends of the sampling resistor are greater than the starting voltage of the third triode, the third triode starts to be conducted, the grid voltage of the MOS tube is pulled high, the MOS tube is in an amplification state, and the output current is limited within a preset range.
2. The vehicle door handle power supply circuit with the low cost and the overload and overvoltage protection function according to claim 1, wherein the MOS tube is connected with a fourth triode, a fifth triode and a first voltage regulator tube are sequentially connected in series and connected to a power output circuit;
the first voltage-regulator tube, the fourth triode and the fifth triode form an output voltage detection control circuit;
when the output voltage in the circuit exceeds the voltage stabilizing value of the first voltage stabilizing tube, the first voltage stabilizing tube is conducted reversely, redundant voltage is loaded on the base electrode of the fifth triode to be conducted, the fourth base electrode is pulled down and conducted at the same time, the grid voltage of the MOS tube is pulled up and cut off, and the output circuit is closed.
3. The vehicle door handle power supply circuit with the low cost and the overload and overvoltage protection function according to claim 1, wherein a second voltage regulator tube is connected in parallel between MOS tube grid source electrode circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110372287.0A CN113054715A (en) | 2021-04-07 | 2021-04-07 | Low-cost automobile door handle power supply circuit with overload overvoltage protection function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110372287.0A CN113054715A (en) | 2021-04-07 | 2021-04-07 | Low-cost automobile door handle power supply circuit with overload overvoltage protection function |
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| Publication Number | Publication Date |
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| CN113054715A true CN113054715A (en) | 2021-06-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110372287.0A Pending CN113054715A (en) | 2021-04-07 | 2021-04-07 | Low-cost automobile door handle power supply circuit with overload overvoltage protection function |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102761252A (en) * | 2012-07-25 | 2012-10-31 | 广州视源电子科技股份有限公司 | Switching power supply circuit with switching MOS tube |
| CN203734283U (en) * | 2013-10-28 | 2014-07-23 | 西安Tcl软件开发有限公司 | Power supply protection circuit and power supply device |
| CN104362608A (en) * | 2014-12-03 | 2015-02-18 | 中国兵器工业集团第二一四研究所苏州研发中心 | Overvoltage suppression and under-voltage surge detection circuit |
| CN109546624A (en) * | 2019-01-25 | 2019-03-29 | 帝森克罗德集团有限公司 | DC-DC power source protects circuit |
| CN210201467U (en) * | 2019-06-28 | 2020-03-27 | 上海鼎充新能源技术有限公司 | Simple direct-current overvoltage-preventing circuit |
| CN211032828U (en) * | 2019-11-20 | 2020-07-17 | 无锡凌博电子技术有限公司 | Keyless system of electric vehicle |
| CN112019003A (en) * | 2020-08-18 | 2020-12-01 | 重庆智行者信息科技有限公司 | Load driving circuit with full diagnosis function built by discrete components |
| CN212519518U (en) * | 2020-06-28 | 2021-02-09 | 宁波科达仪表有限公司 | Instrument illumination automatic control circuit |
-
2021
- 2021-04-07 CN CN202110372287.0A patent/CN113054715A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102761252A (en) * | 2012-07-25 | 2012-10-31 | 广州视源电子科技股份有限公司 | Switching power supply circuit with switching MOS tube |
| CN203734283U (en) * | 2013-10-28 | 2014-07-23 | 西安Tcl软件开发有限公司 | Power supply protection circuit and power supply device |
| CN104362608A (en) * | 2014-12-03 | 2015-02-18 | 中国兵器工业集团第二一四研究所苏州研发中心 | Overvoltage suppression and under-voltage surge detection circuit |
| CN109546624A (en) * | 2019-01-25 | 2019-03-29 | 帝森克罗德集团有限公司 | DC-DC power source protects circuit |
| CN210201467U (en) * | 2019-06-28 | 2020-03-27 | 上海鼎充新能源技术有限公司 | Simple direct-current overvoltage-preventing circuit |
| CN211032828U (en) * | 2019-11-20 | 2020-07-17 | 无锡凌博电子技术有限公司 | Keyless system of electric vehicle |
| CN212519518U (en) * | 2020-06-28 | 2021-02-09 | 宁波科达仪表有限公司 | Instrument illumination automatic control circuit |
| CN112019003A (en) * | 2020-08-18 | 2020-12-01 | 重庆智行者信息科技有限公司 | Load driving circuit with full diagnosis function built by discrete components |
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Application publication date: 20210629 |