CN203339695U - Protection circuit of intelligent switch for vehicle - Google Patents
Protection circuit of intelligent switch for vehicle Download PDFInfo
- Publication number
- CN203339695U CN203339695U CN2013203674774U CN201320367477U CN203339695U CN 203339695 U CN203339695 U CN 203339695U CN 2013203674774 U CN2013203674774 U CN 2013203674774U CN 201320367477 U CN201320367477 U CN 201320367477U CN 203339695 U CN203339695 U CN 203339695U
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- intelligent switch
- diode
- afterflow
- switch chip
- relay
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Abstract
The utility model relates to a protection circuit of an intelligent switch for a vehicle. An intelligent switch chip output end is connected with a freewheeling branch for inductive load freewheeling, the freewheeling branch comprises a diode and a relay, a normally-opened contact is connected in series with the diode. The relay is employed in combination with the diode to realize functions freewheeling protection and reversal connection resistance protection of a power source, so problems of complexity or low practicality existing in a power source polarity reversal connection resistance circuit in the prior art are solved.
Description
Technical field
The utility model relates to the protective circuit of vehicle intelligent switch.
Background technology
The intelligent power switch chip that semiconductor company of Infineon releases, when being short-circuited, during the situation of overload or excess Temperature, intelligent power switch can be closed voluntarily, thereby avoided the damage of self, there is higher reliability, therefore more and more be applied in automobile electronics.But automobile electronics need to have the requirement of anti-error-polarity connection of power supply, so need increasing peripheral circuit, the intelligent power switch chip could realize this requirement.The method of anti-error-polarity connection of power supply at present commonly used is at power end series diode or metal-oxide-semiconductor or fusible link, but after series diode when electric current is large caloric value large, efficiency is low, cost is higher and circuit is complicated for the series connection metal-oxide-semiconductor, the method defect of series connection fuse is also larger, during reverse power connection, open circuit needs the long period, so practicality is low.
The utility model content
The purpose of this utility model is to provide the protective circuit of vehicle intelligent switch, in order to solve existing anti-electric power polarity reversal connection circuit complexity or the low problem of practicality.
For achieving the above object, scheme of the present utility model comprises:
A kind of protective circuit of vehicle intelligent switch; the output of intelligent switch chip connects the afterflow branch road for the inductive load afterflow; diode of route is propped up in afterflow and relay normally open contact is composed in series; one end of afterflow branch road connects the intelligent switch chip output; other end ground connection; diode current flow direction in the afterflow branch road is pointed to the intelligent switch chip output from ground; the control loop of described relay is composed in series by relay coil and counnter attack diode; one termination power positive pole of control loop, other end ground connection.
The relay coil of the protective circuit of a vehicle intelligent switch diode for the afterflow of coil own in parallel.
The earth terminal of described intelligent switch chip is by counnter attack diode ground connection.
A kind of protective circuit of vehicle intelligent switch; the intelligent switch chip output connects the afterflow branch road for the inductive load afterflow; diode of route is propped up in afterflow and relay normally open contact is composed in series; one end of afterflow branch road connects the intelligent switch chip output; another termination positive source; diode current flow direction in the afterflow branch road is pointed to positive source by the intelligent switch chip output; the control loop of described relay is composed in series by relay coil and counnter attack diode; one end ground connection of control loop, another termination positive source.
The relay coil of the protective circuit of a described vehicle intelligent switch diode for the afterflow of coil own in parallel.
The negative electrode of the control loop diode of the protective circuit of described vehicle intelligent switch also connects the power end of intelligent switch chip.
When the power supply exact connect ion, the relay normally open contact adhesive, when now the vehicle intelligent switch cuts out, inductive load is by the afterflow branch road afterflow of setting up in circuit, when error-polarity connection of power supply, the relay control circuit diode stops current flowing, relay normally open contact tripping, now intelligent switch chip no-voltage, electric current, reach with this purpose that prevents that switch chip from damaging.Utilize the combination of relay and diode to complete afterflow protection, anti-reverse defencive function, solve existing anti-electric power polarity reversal connection circuit complexity or the low problem of practicality.
The accompanying drawing explanation
Fig. 1 is automobile-used flash output intelligent switch protective circuit schematic diagram;
Fig. 2 is automobile-used low limit output intelligent switch protective circuit schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in more detail.
Be illustrated in figure 1 and there is afterflow defencive function vehicle intelligent switch flash output protection circuit schematic diagram; VBAT is power supply; GND is ground; U1 is the intelligent switch chip; the control signal that IN is intelligent switch; the output signal that OUT is intelligent switch, D1, D2, D3, D4 are diode, S1 is relay.The negative electrode of the output terminating diode D2 of intelligent switch, the anode of D2 is through relay normally open contact ground connection; The control coil one end ground connection of relay, the negative electrode of another terminating diode D3, the anode of D3 connects positive source; Diode D4 is in parallel with relay control coil, wherein D4 plus earth, and negative electrode connects the negative electrode of D3; Diode D1 anode connects the intelligent switch earth terminal, minus earth, and GCOM is signal, this signal connects other passage through diode can realize multichannel afterflow protection.
The utlity model has afterflow defencive function vehicle intelligent switch flash output protection circuit operation principle as follows: when electric power polarity is normal, intelligent switch chip U1 normal operation, relay S1 adhesive, output signal end forms freewheeling circuit through D2 and relay normally open contact, when turn-offing inductive load, plays a protective role; During error-polarity connection of power supply, D1, D3 cut-off, relay S1 disconnects, and intelligent switch chip U1, without reverse voltage, electric current, can not damage, and realizes the function of expection.
Be illustrated in figure 2 and have the low limit of afterflow defencive function vehicle intelligent switch output protection circuit schematic diagram, VBAT is power supply, and GND is ground; U2 is the intelligent switch chip, the control signal that IN is intelligent switch, the output signal that OUT is intelligent switch; D5, D6, D7 are diode, and S2 is relay.The anode of the output terminating diode D7 of intelligent switch, the negative electrode of D7 connects positive source through relay normally open contact; One end ground connection of relay control coil, the negative electrode of another terminating diode D5, the anode of D5 connects power supply, and the negative electrode of D5 also is connected with the power end of intelligent switch chip; Diode D6 is in parallel with relay control coil, wherein D6 plus earth, and negative electrode connects the negative electrode of D5, and GCOM is signal, and this signal connects other passage through diode can realize multichannel afterflow protection.
The utlity model has the low limit of afterflow defencive function vehicle intelligent switch output protection circuit operation principle as follows: when electric power polarity is normal, intelligent switch chip U2 normal operation, relay S2 adhesive, electric current meets power supply VBAT through diode D7, relay normally open contact, when turn-offing inductive load, plays a protective role; During error-polarity connection of power supply, the D5 cut-off, relay S2 disconnects, and intelligent switch chip U2 power pin, without reverse voltage, electric current, can not damaged, and realizes the function of expection.
Claims (6)
1. the protective circuit of a vehicle intelligent switch; it is characterized in that; the output of intelligent switch chip connects the afterflow branch road for the inductive load afterflow; diode of route is propped up in afterflow and relay normally open contact is composed in series; one end of afterflow branch road connects the intelligent switch chip output; other end ground connection; diode current flow direction in the afterflow branch road is pointed to the intelligent switch chip output from ground; the control loop of described relay is composed in series by relay coil and counnter attack diode; one termination power positive pole of control loop, other end ground connection.
2. the protective circuit of a kind of vehicle intelligent switch according to claim 1, is characterized in that, a described relay coil diode for the afterflow of coil own in parallel.
3. the protective circuit of a kind of vehicle intelligent switch according to claim 1, is characterized in that, the earth terminal of described intelligent switch chip is by counnter attack diode ground connection.
4. the protective circuit of a vehicle intelligent switch; it is characterized in that; the intelligent switch chip output connects the afterflow branch road for the inductive load afterflow; diode of route is propped up in afterflow and relay normally open contact is composed in series; one end of afterflow branch road connects the intelligent switch chip output; another termination positive source; diode current flow direction in the afterflow branch road is pointed to positive source by the intelligent switch chip output; the control loop of described relay is composed in series by relay coil and counnter attack diode; one end ground connection of control loop, another termination positive source.
5. the protective circuit of a kind of vehicle intelligent switch according to claim 4, is characterized in that, a described relay coil diode for the afterflow of coil own in parallel.
6. the protective circuit of a kind of vehicle intelligent switch according to claim 4, is characterized in that, the negative electrode of control loop diode also connects the power end of intelligent switch chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203674774U CN203339695U (en) | 2013-06-24 | 2013-06-24 | Protection circuit of intelligent switch for vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203674774U CN203339695U (en) | 2013-06-24 | 2013-06-24 | Protection circuit of intelligent switch for vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203339695U true CN203339695U (en) | 2013-12-11 |
Family
ID=49708351
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013203674774U Expired - Fee Related CN203339695U (en) | 2013-06-24 | 2013-06-24 | Protection circuit of intelligent switch for vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203339695U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326347A (en) * | 2013-06-24 | 2013-09-25 | 郑州宇通客车股份有限公司 | Intelligent switch protection circuit used for automobile |
-
2013
- 2013-06-24 CN CN2013203674774U patent/CN203339695U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326347A (en) * | 2013-06-24 | 2013-09-25 | 郑州宇通客车股份有限公司 | Intelligent switch protection circuit used for automobile |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131211 Termination date: 20190624 |