CN218482659U - Vehicle-mounted electrical appliance surge protection circuit - Google Patents
Vehicle-mounted electrical appliance surge protection circuit Download PDFInfo
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- CN218482659U CN218482659U CN202222811433.8U CN202222811433U CN218482659U CN 218482659 U CN218482659 U CN 218482659U CN 202222811433 U CN202222811433 U CN 202222811433U CN 218482659 U CN218482659 U CN 218482659U
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Abstract
The utility model relates to an automotive electronics trade technical field specifically discloses an on-vehicle electrical apparatus surge protection circuit, including MOS pipe, first diode, second diode, first resistance, second resistance and electric capacity, the drain electrode of MOS pipe is connected respectively the negative pole of first diode the one end and the surge voltage input Vin of first resistance, the grid of MOS pipe is connected respectively the other end of first resistance the one end of second resistance the negative pole of second diode and the one end of electric capacity, the source connection voltage output Vout of MOS pipe, the positive pole of first diode the other end of second resistance the positive pole of second diode and the other end of electric capacity links to each other back ground connection. The utility model provides a vehicle-mounted electrical apparatus surge protection circuit can solve the problem that present surge protection circuit is bulky, protective capability is incomplete.
Description
Technical Field
The utility model relates to an automotive electronics trade technical field, more specifically relates to an on-vehicle electrical apparatus surge protection circuit.
Background
As shown in fig. 1, the device 1 (D1 shown in fig. 1), which is the most common design, uses 1 TVS to absorb the energy of the surge voltage; problems with the device 1: d1 is bulky and difficult to pass through all the rigors of the standard.
As shown in fig. 2, the device 2 (circuit formed by D1, R1 and D2 shown in fig. 2), referred to the official application circuit of Vishay; two TVSs are used to step down the pressure. Problems with the device 2: r1 needs to adopt a power resistor with a larger volume to bear the voltage difference between D1 and D2, and the larger the load power is, the larger the volume of R1 is.
Disclosure of Invention
In order to solve the not enough of existence among the prior art, the utility model provides an on-vehicle electrical apparatus surge protection circuit to solve present surge protection circuit bulky, the incomplete problem of protective capacities.
As a first aspect of the present invention, the utility model provides an on-vehicle electrical apparatus surge protection circuit, including MOS pipe Q1, first diode D1, second diode D2, first resistance R1, second resistance R2 and electric capacity C1, MOS pipe Q1's drain electrode is connected respectively first diode D1's negative pole first resistance R1's one end and surge voltage input terminal Vin, MOS pipe Q1's grid is connected respectively first resistance R1's the other end second resistance R2's one end second diode D2's negative pole and electric capacity C1's one end, voltage output Vout is connected to MOS pipe Q1's source electrode, first diode D1's positive pole second resistance R2's the other end second diode D2's positive pole and electric capacity C1's the other end links to each other the back ground connection.
Further, the MOS transistor Q1 is an NMOS transistor.
Further, the first diode D1 is a transient diode.
Further, the second diode D2 is a voltage regulator tube.
Further, the first resistor R1 and the second resistor R2 are voltage dividing resistors.
The utility model provides an on-vehicle electrical apparatus surge protection circuit has following advantage:
(1) The linear voltage stabilizing circuit of the MOS tube is adopted, so that the occupied area of the PCB is reduced compared with the TVS;
(2) The heating of the element is small, and the device is greatly reduced compared with the device 1; the device 1 and the device 2 can introduce surge energy into the device per se, and the surge energy is released through heat, so that the device is similar to a dredging scheme in flood control, and the water flow is large; the device blocks surge voltage through the MOS tube Q1, only takes very small working current, is similar to a scheme of 'blocking' in flood control, and has small water flow;
(3) The protective capability is strong, and the most severe test grade can be resisted;
(4) The circuit is essentially a linear power supply and is placed in the general power supply population, which is beneficial to improving the EMC performance of the product.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
Fig. 1 is a schematic diagram of a surge protection circuit in the prior art.
Fig. 2 is a schematic diagram of another surge protection circuit in the prior art.
Fig. 3 is the utility model provides a vehicle-mounted electrical apparatus surge protection circuit's structure chart.
Detailed Description
To further illustrate the technical means and effects of the present invention for achieving the objectives of the present invention, the following detailed description will be given to the specific embodiments, structures, features and effects of the surge protection circuit for vehicle-mounted electric appliances according to the present invention with reference to the accompanying drawings and preferred embodiments. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
In this embodiment, a surge protection circuit for a vehicle-mounted electrical apparatus is provided, as shown in fig. 3, the surge protection circuit for a vehicle-mounted electrical apparatus includes an MOS transistor Q1, a first diode D1, a second diode D2, a first resistor R1, a second resistor R2, and a capacitor C1, a drain of the MOS transistor Q1 is connected to a cathode of the first diode D1, one end of the first resistor R1, and a surge voltage input terminal Vin, a gate of the MOS transistor Q1 is connected to the other end of the first resistor R1, one end of the second resistor R2, a cathode of the second diode D2, and one end of the capacitor C1, a source of the MOS transistor Q1 is connected to a voltage output terminal Vout, and an anode of the first diode D1, the other end of the second resistor R2, an anode of the second diode D2, and the other end of the capacitor C1 are connected to ground.
The utility model provides an on-vehicle electrical apparatus surge protection circuit for passenger car miniwatt on-vehicle electrical apparatus is used for resisting throwing among the electromagnetic environment and load produced surge voltage.
Preferably, the MOS transistor Q1 is an NMOS transistor.
Preferably, the first diode D1 is a transient diode. Specifically, D1 is a low-power TVS (transient diode) for protecting the first resistor R1, the second resistor R2, and the second diode D2.
Preferably, the second diode D2 is a voltage regulator tube for protecting the NMOS transistor Q1 of the core element and stabilizing the output voltage Vout.
Preferably, the first resistor R1 and the second resistor R2 are voltage dividing resistors, and provide a linearly varying bias voltage within a normal voltage range.
Specifically, in fig. 3, vin is used to input a surge voltage, and Vout is an output voltage after being protected by the surge protection circuit.
Specifically, the following parameters are respectively expressed:
V GS : MOS tubeA control voltage of Q1;
V DS : the drain-source voltage of the MOS transistor Q1;
V GS（MAX） : the MOS tube Q1 has the highest working voltage of a control electrode;
V GS(Plateau) : the MOS tube Q1 controls the voltage of a pole Mi Leping;
V Z(D2) : rated stable voltage of a voltage stabilizing tube D2;
R DS : the drain-source resistance of the MOS tube Q1;
I LOAD : the load current.
The utility model provides an on-vehicle electrical apparatus surge protection circuit's theory of operation as follows:
V Z(D2) = V GS(Plateau) +V OUT thus, there are: v OUT =V Z(D2) -V GS(Plateau) Due to the voltage V Z(D2) And V GS(Plateau) Are stable, so the output voltage Vout is also stable.
Vin = V OUT + V DS = V OUT + R DS * I LOAD The output voltage Vout is stable, so when the input voltage Vin varies, V DS Also varies, for a steady load current I LOAD In other words, the on-resistance R of the MOS transistor Q1 DS As well as variations.
The energy applied to the MOS tube Q1 by the surge voltage is as follows: (V) IN – V OUT ）* I LOAD Here I LOAD And the surge voltage is very small and is different from the TVS surge current by two orders of magnitude, so that the surge voltage can be easily resisted, and the surge test of the P5 pulse is passed.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiments, and although the present invention has been disclosed with the preferred embodiments, it is not limited to the present invention, and any skilled person in the art can make some modifications or equivalent embodiments without departing from the scope of the present invention, but all the technical matters of the present invention are within the scope of the present invention.
Claims (5)
1. The surge protection circuit of the vehicle-mounted electric appliance is characterized by comprising an MOS tube Q1, a first diode D1, a second diode D2, a first resistor R1, a second resistor R2 and a capacitor C1, wherein the drain electrode of the MOS tube Q1 is respectively connected with the cathode of the first diode D1, one end of the first resistor R1 and a surge voltage input end Vin, the grid electrode of the MOS tube Q1 is respectively connected with the other end of the first resistor R1, one end of the second resistor R2, the cathode of the second diode D2 and one end of the capacitor C1, the source electrode of the MOS tube Q1 is connected with a voltage output end Vout, and the anode of the first diode D1, the other end of the second resistor R2, the anode of the second diode D2 and the other end of the capacitor C1 are connected and then grounded.
2. The surge protection circuit of a vehicle-mounted electrical appliance according to claim 1, wherein the MOS transistor Q1 is an NMOS transistor.
3. The surge protection circuit for vehicle-mounted electric appliances according to claim 1, wherein the first diode D1 is a transient diode.
4. The surge protection circuit for the vehicle-mounted electric appliance according to claim 1, wherein the second diode D2 is a voltage regulator tube.
5. The surge protection circuit for the vehicle-mounted electric appliance according to claim 1, wherein the first resistor R1 and the second resistor R2 are voltage dividing resistors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222811433.8U CN218482659U (en) | 2022-10-25 | 2022-10-25 | Vehicle-mounted electrical appliance surge protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222811433.8U CN218482659U (en) | 2022-10-25 | 2022-10-25 | Vehicle-mounted electrical appliance surge protection circuit |
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| Publication Number | Publication Date |
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| CN218482659U true CN218482659U (en) | 2023-02-14 |
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| CN202222811433.8U Active CN218482659U (en) | 2022-10-25 | 2022-10-25 | Vehicle-mounted electrical appliance surge protection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117543522A (en) * | 2023-09-18 | 2024-02-09 | 中勍科技股份有限公司 | Isolation surge protection circuit based on voltage superposition control |
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2022
- 2022-10-25 CN CN202222811433.8U patent/CN218482659U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117543522A (en) * | 2023-09-18 | 2024-02-09 | 中勍科技股份有限公司 | Isolation surge protection circuit based on voltage superposition control |
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