CN202353196U - Protection circuit for electronic switch - Google Patents
Protection circuit for electronic switch Download PDFInfo
- Publication number
- CN202353196U CN202353196U CN2011204997590U CN201120499759U CN202353196U CN 202353196 U CN202353196 U CN 202353196U CN 2011204997590 U CN2011204997590 U CN 2011204997590U CN 201120499759 U CN201120499759 U CN 201120499759U CN 202353196 U CN202353196 U CN 202353196U
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- Prior art keywords
- electronic switch
- coil
- mosfet
- electrochemical capacitor
- power resistor
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- Expired - Lifetime
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Abstract
The utility model discloses a protection circuit for an electronic switch. The electronic switch for a horn is used for driving a diaphragm to make the horn sound by controlling the switch-on or switch-off of an electromagnetic coil; and when the horn works, 4-5A working current can flow through loops of the electronic switch and the electromagnetic coil, so a relatively high peak voltage (generally more than 500V) can be generated when the electromagnetic coil is switched off. The protection circuit for the electronic switch comprises a capacitor and a power resistor (1), wherein the capacitor and the power resistor are connected in series or parallel at two ends of the electromagnetic coil, or connected in parallel between the D pole and the S pole of a coil metal oxide semiconductor field effect transistor (MOSFET) (3). The protection circuit is applied to the electronic switch.
Description
Technical field:
utility model relates to a kind of protective device that is used for the contactless electronic loudspeaker electronic switch; Be specifically related to a kind of electronic switch protective circuit that is used for automobile.
Background technology:
The effect of
loudspeaker electronic switch is to come driven diaphragm for the break-make of controlling solenoid loudspeaker are taken place; In electronic switch and solenoid loop, can flow through 4-5A operating current during loudspeaker work, so solenoid can produce a higher crest voltage (usually greater than 500V) when turn-offing.The coil MOSFET that adopt use as electronic switch more in horn circuit at present; For guaranteeing that conduction resistance value requires the common withstand voltage of selecting this kind electronic switch about 200V; Loudspeaker coil MOSFET when work is in breakdown conditions; Puncture can cause the MOSFET thermal losses to increase, and reduces the reliability of its work.
Summary of the invention:
purpose of utility model provides overvoltage protection, the absorption circuit of a kind of coil MOSFET, and coil MOSFET is not in breakdown conditions when being used for guaranteeing loudspeaker work.
Above-mentioned purpose realizes through following technical scheme:
a kind of electronic switch protective circuit, its composition comprises: electric capacity, power resistor, described electric capacity is parallelly connected with described power resistor or be connected on the coil two ends or be connected in parallel between the D utmost point, the S utmost point of coil MOSFET.
described electronic switch protective circuit, parallelly connected Transient Suppression Diode TVS between the D of the described coil MOSFET utmost point, the S utmost point; The parallel connection piezo-resistance at described coil MOSFET two ends; Described electric capacity is nonpolarity electrochemical capacitor or MLCC electric capacity or the polarity electrochemical capacitor is arranged.
described electronic switch protective circuit; Described nonpolarity electrochemical capacitor or described MLCC electric capacity and described power resistor series circuit comprise power supply; Described power supply series diode D1, described diode series coil, nonpolarity electrochemical capacitor of described coils from parallel connection of coils and power resistor; The described nonpolarity electrochemical capacitor described power resistor of connecting, described coil is connected electronic switch with described nonpolarity electrochemical capacitor.
described electronic switch protective circuit, described nonpolarity electrochemical capacitor appearance value is 4.7-10 microfarads, and withstand voltage is at 90-110V, and plug-in unit or paster encapsulate; Described MLCC capacitor's capacity is 10 microfarads, and withstand voltage is at 90-110V, and described power resistor is 0.2-1 ohm, 3W, paster encapsulation.
described electronic switch protective circuit; Described have polarity electrochemical capacitor and described power resistor parallel circuits to comprise power supply; Described power supply series diode D1; Described diode series coil, described coil connect electronic switch, described polarity electrochemical capacitor and described power resistor are arranged, and described have a polarity electrochemical capacitor described power resistor of connecting.
described electronic switch protective circuit, it is described that polarity electrochemical capacitor appearance value is arranged is 10 microfarads, withstand voltage is at 90-110V, plug-in unit or paster encapsulation.
described electronic switch protective circuit; Described Transient Suppression Diode TVS is connected in parallel on the D of described coil MOSFET, the circuit between the S utmost point comprises power supply; Described power supply series diode D1; Described diode series coil MOSFET, described coil MOSFET connects electronic switch and Transient Suppression Diode TVS.
described electronic switch protective circuit, described Transient Suppression Diode TVS is for managing clamping voltage at 70-90V, plug-in unit or paster encapsulation.
described electronic switch protective circuit; Described piezo-resistance is connected in parallel on the D of described coil MOSFET, the circuit between the S utmost point comprises power supply; Described power supply series diode D1; Described diode connects described coil MOSFET and described piezo-resistance, the described coil MOSFET parallel connection or the described piezo-resistance of connecting, and described coil MOSFET is connected electronic switch with described piezo-resistance.
described electronic switch protective circuit, described piezo-resistance clamping voltage is 70-90V, plug-in unit or paster encapsulation.
Beneficial effect:
Appearance value 4.7-10 microfarads of nonpolarity electrochemical capacitor are adopted in
1. the utility model; Withstand voltage is about 100V; Plug-in unit or paster encapsulating structure; Power resistor adopts the power resistor of 0.2-1 ohm/3W paster encapsulation to optimize board design, has improved reliability, adopts this kind mode can the D pole tension of coil MOSFET to be controlled in the 100V usually.
2. the utility model adopt MLCC electric capacity to select 10 microfarads usually, and withstand voltage is about 100V, and reliability obviously improves; Power resistor can be controlled at the D pole tension of coil MOSFET in the 100V; In the time of can effectively avoiding the loudspeaker frequent operation to the damage of coil MOSFET.Thereby can make coil MOSFET performance index are required to have reduced the horn designs cost.
3. the utility model employing have polarity electrochemical capacitor appearance value to adopt 10 microfarads, and withstand voltage is about 100V, and packing forms can adopt plug-in unit or paster structure, can the D pole tension of coil MOSFET be controlled in the 80V.
4. the Transient Suppression Diode TVS pipe clamping voltage selected for use of the utility model is about 80V, and packing forms can adopt plug-in unit or paster structure, need not use power resistor to reduce cost effectively.
5. the piezo-resistance clamping voltage selected for use of the utility model is about 80V, and packing forms can adopt plug-in unit or paster structure, and this kind scheme need not use power resistor to reduce cost effectively.
6. the utility model can significantly reduce loudspeaker when work electromagnetic interference to external world.Caloric value in the time of can significantly reducing loudspeaker and work long hours has improved the reliability of electronic horn work.
Description of drawings:
accompanying drawing 1 is the electrical block diagram that the nonpolarity electrochemical capacitor+power resistor of this product is connected in parallel on the coil two ends.
accompanying drawing 2 is electrical block diagrams that this product MLCC electric capacity+power resistor is connected in parallel on the coil two ends.
accompanying drawing 3 is that this product has polarity electrochemical capacitor+power resistor to be connected in parallel on electrical block diagram between the D utmost point, the S utmost point of coil MOSFET.
accompanying drawing 4 is this product TVS D utmost point of being connected in parallel on coil MOSFET, the electrical block diagram between the S utmost point.
accompanying drawing 5 is electrical block diagrams that this product piezo-resistance is connected in parallel on the coil two ends.
accompanying drawing 6 is electrical block diagrams of this product piezo-resistance series coil.
Embodiment:
Embodiment 1:
a kind of electronic switch protective circuit, its composition comprises: electric capacity, power resistor 1, described electric capacity and described power resistor 1 are parallelly connected or be connected on coil 2 two ends or be connected in parallel between the D utmost point, the S utmost point of coil MOSFET3.
Embodiment 2:
embodiment 1 described electronic switch protective circuit, parallelly connected Transient Suppression Diode TVS4 between the D of the described coil MOSFET utmost point, the S utmost point; The parallel connection piezo-resistance 5 at described coil MOSFET two ends; Described electric capacity is nonpolarity electrochemical capacitor 6 or MLCC electric capacity 7 or polarity electrochemical capacitor 8 is arranged.
Embodiment 3:
above-mentioned electronic switch protective circuit; Described nonpolarity electrochemical capacitor or described MLCC electric capacity and described power resistor series circuit comprise power supply; Described power supply series diode D1, described diode series coil, nonpolarity electrochemical capacitor of described coils from parallel connection of coils and power resistor; The described nonpolarity electrochemical capacitor described power resistor of connecting, described coil is connected electronic switch T with described nonpolarity electrochemical capacitor.
described electronic switch protective circuit, described nonpolarity electrochemical capacitor appearance value is 4.7-10 microfarads, and withstand voltage is at 90-110V, and plug-in unit or paster encapsulate; Described MLCC capacitor's capacity is 10 microfarads, and withstand voltage is at 90-110V, and described power resistor is 0.2-1 ohm, 3W, paster encapsulation.
Embodiment 4:
above-mentioned electronic switch protective circuit; Described have polarity electrochemical capacitor and described power resistor parallel circuits to comprise power supply; Described power supply series diode D1; Described diode series coil, described coil connect electronic switch T, described polarity electrochemical capacitor and described power resistor are arranged, and described have a polarity electrochemical capacitor described power resistor of connecting.
described electronic switch protective circuit, it is described that polarity electrochemical capacitor appearance value is arranged is 10 microfarads, withstand voltage is at 90-110V, plug-in unit or paster encapsulation.
Embodiment 5:
above-mentioned electronic switch protective circuit; Described Transient Suppression Diode TVS is connected in parallel on the D of described coil MOSFET, the circuit between the S utmost point comprises power supply; Described power supply series diode D1; Described diode series coil MOSFET, described coil MOSFET connects electronic switch T and Transient Suppression Diode TVS.
described electronic switch protective circuit, described Transient Suppression Diode TVS is for managing clamping voltage at 70-90V, plug-in unit or paster encapsulation.
Embodiment 6:
above-mentioned electronic switch protective circuit; Described piezo-resistance is connected in parallel on the D of described coil MOSFET, the circuit between the S utmost point comprises power supply; Described power supply series diode D1; Described diode connects described coil MOSFET and described piezo-resistance, the described coil MOSFET parallel connection or the described piezo-resistance of connecting, and described coil MOSFET is connected electronic switch T with described piezo-resistance.
described electronic switch protective circuit, described piezo-resistance clamping voltage is 70-90V, plug-in unit or paster encapsulation.
Embodiment 7:
The described electronic switch protective circuit of
above embodiment; Nonpolarity electrochemical capacitor+power resistor is connected in parallel on the coil two ends; Nonpolarity electrochemical capacitor appearance value adopts 4.7-10 microfarads, and withstand voltage is about 100V, and packing forms adopts plug-in unit or paster structure.Power resistor adopts the power resistor of 0.2-1 ohm/3W paster encapsulation, and purpose is to optimize board design to improve its reliability, adopts this kind mode can the D utmost point pole tension of coil MOSFET to be controlled in the 100V usually.
Embodiment 8:
The described electronic switch protective circuit of
above embodiment, MLCC electric capacity+power resistor is connected in parallel on the coil two ends, and MLCC electric capacity is selected 10 microfarads, and withstand voltage is about 100V, and this kind scheme relative cost is higher but reliability can obvious improve.Adopt this kind mode can the D utmost point pole tension of coil MOSFET to be controlled in the 100V usually.
Embodiment 9:
The described electronic switch protective circuit of
above embodiment; There is polarity electrochemical capacitor+power resistor to be connected in parallel between the D utmost point, the S utmost point of coil MOSFET; Capacitor's capacity adopts 10 microfarads; Withstand voltage is about 100V, and packing forms adopts plug-in unit or paster structure, adopts this kind mode that the D utmost point pole tension of coil MOSFET is controlled in the 80V.
Embodiment 10:
The described electronic switch protective circuit of
above embodiment; Pipe clamping voltage TVS is connected in parallel between the D utmost point, the S utmost point of coil MOSFET; The pipe clamping voltage pipe clamping voltage TVS that selects for use is about 80V; Packing forms can adopt plug-in unit or paster structure, and this kind scheme need not use power resistor to reduce cost effectively.
Embodiment 11:
The described electronic switch protective circuit of above embodiment; Piezo-resistance 9 is connected in parallel on the coil two ends; The piezo-resistance clamping voltage of selecting for use is about 80V, and packing forms can adopt plug-in unit or paster structure, and this kind scheme need not use power resistor to reduce cost effectively
Claims (10)
1.
a kind of electronic switch protective circuit, its composition comprises: electric capacity, power resistor is characterized in that: described electric capacity is parallelly connected with described power resistor or be connected on the coil two ends or be connected in parallel between the D utmost point, the S utmost point of coil MOSFET.
2.
electronic switch protective circuit according to claim 1 is characterized in that: parallelly connected Transient Suppression Diode TVS between the D of the described coil MOSFET utmost point, the S utmost point; The parallel connection piezo-resistance at described coil MOSFET two ends; Described electric capacity is nonpolarity electrochemical capacitor or MLCC electric capacity or the polarity electrochemical capacitor is arranged.
3.
electronic switch protective circuit according to claim 2; It is characterized in that: described nonpolarity electrochemical capacitor or described MLCC electric capacity and described power resistor series circuit comprise power supply; Described power supply series diode D1; Described diode series coil; Nonpolarity electrochemical capacitor of described coils from parallel connection of coils and power resistor, the described nonpolarity electrochemical capacitor described power resistor of connecting, described coil is connected electronic switch with described nonpolarity electrochemical capacitor.
4.
electronic switch protective circuit according to claim 2, it is characterized in that: described nonpolarity electrochemical capacitor appearance value is 4.7-10 microfarads, withstand voltage is at 90-110V, plug-in unit or paster encapsulation; Described MLCC capacitor's capacity is 10 microfarads, and withstand voltage is at 90-110V, and described power resistor is 0.2-1 ohm, 3W, paster encapsulation.
5.
electronic switch protective circuit according to claim 2; It is characterized in that: described have polarity electrochemical capacitor and described power resistor parallel circuits to comprise power supply; Described power supply series diode D1; Described diode series coil, described coil connect electronic switch, described polarity electrochemical capacitor and described power resistor are arranged, and described have a polarity electrochemical capacitor described power resistor of connecting.
6.
is characterized in that according to claim 2 or 5 described electronic switch protective circuits: described polarity electrochemical capacitor appearance value is arranged is 10 microfarads, and withstand voltage is at 90-110V, plug-in unit or paster encapsulation.
7.
are according to claim 2 or 4 or 5 described electronic switch protective circuits; It is characterized in that: described Transient Suppression Diode TVS is connected in parallel on the D of described coil MOSFET, the circuit between the S utmost point comprises power supply; Described power supply series diode D1; Described diode series coil MOSFET, described coil MOSFET connects electronic switch and Transient Suppression Diode TVS.
8.
is characterized in that according to claim 2 or 4 or 5 described electronic switch protective circuits: described Transient Suppression Diode TVS is for managing clamping voltage at 70-90V, plug-in unit or paster encapsulation.
9.
are according to claim 2 or 4 or 5 described electronic switch protective circuits; It is characterized in that: described piezo-resistance is connected in parallel on the D of described coil MOSFET, the circuit between the S utmost point comprises power supply; Described power supply series diode D1; Described diode connects described coil MOSFET and described piezo-resistance, the described coil MOSFET parallel connection or the described piezo-resistance of connecting, and described coil MOSFET is connected electronic switch with described piezo-resistance.
10.
electronic switch protective circuit according to claim 9, it is characterized in that: described piezo-resistance clamping voltage is 70-90V, plug-in unit or paster encapsulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204997590U CN202353196U (en) | 2011-12-05 | 2011-12-05 | Protection circuit for electronic switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204997590U CN202353196U (en) | 2011-12-05 | 2011-12-05 | Protection circuit for electronic switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202353196U true CN202353196U (en) | 2012-07-25 |
Family
ID=46542160
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204997590U Expired - Lifetime CN202353196U (en) | 2011-12-05 | 2011-12-05 | Protection circuit for electronic switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202353196U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103138247A (en) * | 2011-12-05 | 2013-06-05 | 哈尔滨固泰电子有限责任公司 | Electronic switch protective circuit |
-
2011
- 2011-12-05 CN CN2011204997590U patent/CN202353196U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103138247A (en) * | 2011-12-05 | 2013-06-05 | 哈尔滨固泰电子有限责任公司 | Electronic switch protective circuit |
| CN103138247B (en) * | 2011-12-05 | 2017-02-22 | 哈尔滨固泰电子有限责任公司 | Electronic switch protective circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120725 |
|
| CX01 | Expiry of patent term |