CN202059164U - Protective circuit for inverse connection and short circuit of charger - Google Patents
Protective circuit for inverse connection and short circuit of charger Download PDFInfo
- Publication number
- CN202059164U CN202059164U CN2011201615062U CN201120161506U CN202059164U CN 202059164 U CN202059164 U CN 202059164U CN 2011201615062 U CN2011201615062 U CN 2011201615062U CN 201120161506 U CN201120161506 U CN 201120161506U CN 202059164 U CN202059164 U CN 202059164U
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- China
- Prior art keywords
- charger
- type field
- effect transistor
- field effect
- circuit
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- Expired - Fee Related
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model discloses a protective circuit for inverse connection and short circuit of a charger. The protective circuit comprises an optical coupler tube U1 which is used for detecting the voltage of the output end of the charger, wherein two input pins of the optical coupler tube U1 are respectively connected with a positive pole of the output end of the charger by a resistor R1 and a resistor R2; an output pin of the optical coupler tube U1 is connected with a grid electrode of at least one N-type field-effect tube; a drain electrode and a source electrode of the N-type field-effect tube are connected in series at the output end of the negative pole of the charger; a resistor R4 and a capacitor C1 are also connected in parallel among the input pins and the output pin of the optical coupler tube U1; and a protective resistor R1 is also connected in parallel between the grid electrode and the drain electrode of the N-type field-effect tub. The protective circuit is simple, only consists of the N-type field-effect tube, the optical coupler tube, the resistors and the capacitor and has low cost; and the protective circuit is stable, and only when the output end is correctly connected with the polarity of a battery, the N-type field-effect tube can be conducted, thereby protecting an inversely connected protective system from being damaged due to the inversely connected polarity.
Description
Technical field
The utility model relates to circuit protection device, is specifically related to that a kind of charger connects instead, short-circuit protection circuit.
Background technology
In the prior art; charger connects instead, the short-circuit protection circuit aspect; now general relay and two kinds of protected modes of P type field effect transistor of mainly containing; but two kinds of methods all have its limitation; relay is because by contacting; in big electric current, cause the damage of relay easily because of poor contact of contacts, and the price of P type field effect transistor on market is high more a lot of than N type field effect transistor, and kind is also many not as good as N type field effect transistor.
The utility model content
At the above-mentioned defective of prior art, the utility model provides that a kind of charger connects instead, short-circuit protection circuit, and protection charger and battery that can safety and stability damage because of circuit connects on the contrary.
Constructing a kind of charger connects instead; short-circuit protection circuit; comprise that one is used to detect the optocoupler pipe U1 of charger output end voltage; two input pins of optocoupler pipe U1 are respectively by resistance R 1; R2 is connected with the output head anode of charger; the output pin of optocoupler pipe U1 is connected with the grid of at least one N type field effect transistor; the cathode output end that the drain electrode of described N type field effect transistor and source electrode are serially connected in charger; between the input and output pin of described optocoupler pipe U1 also and be connected to resistance R 4 and capacitor C 1, between the grid of described N type field effect transistor and drain electrode also and be connected to protective resistance R1.
Connect instead at above-mentioned charger, in the short-circuit protection circuit, on the output pin of described optocoupler pipe U1, be connected with a N type field effect transistor.
Connect instead at above-mentioned charger, in the short-circuit protection circuit, on the output pin of described optocoupler pipe U1, be connected in parallel to 2,3 or a plurality of N type field effect transistor.
Advantage of the present utility model is: utilize the optocoupler pipe, detect the voltage Vout at output two ends, have only output polarity connect to after, the grid power supply of N type field effect transistor is given in the optocoupler conducting, the conducting of N type field effect transistor, charger and battery connection charge the battery.Characteristics of the present utility model are; the priority that can be regardless of Vin and Vout is connected; when formerly connecting Vin; N type field effect transistor still is in off state; N type field effect transistor could conducting when having only output end vo ut correctly to be connected with battery polar, connects anti-protection system and does not connect the anti-damage that causes because of polarity thereby protected.Whether adopt the battery voltage detection function, can accurately detect the pond and connect instead, perhaps output short-circuit is exported protection charger and battery thereby cut off charger; Circuit is simple, and only by a N type effect pipe and an optocoupler pipe, several resistance and an electric capacity are formed, and cost is low; Circuit is stable, does not have the problem of poor contact of contacts; Low on-resistance, the conducting resistance of N type field effect transistor generally has only several milliohms, and dilatation is convenient, if when charging current is very big, can a plurality of N type field effect transistor in parallel realizes the protection of large current charge device.Below in conjunction with drawings and Examples the utility model is further specified.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
As shown in Figure 1; designing a kind of charger connects instead; short-circuit protection circuit; comprise that one is used to detect the optocoupler pipe U1 of charger output end voltage; two input pins of optocoupler pipe U1 are respectively by resistance R 1; R2 is connected with the output head anode of charger; the output pin of optocoupler pipe U1 is connected with the grid of at least one N type field effect transistor; the cathode output end that the drain electrode of described N type field effect transistor and source electrode are serially connected in charger; between the input and output pin of described optocoupler pipe U1 also and be connected to resistance R 4 and capacitor C 1, between the grid of described N type field effect transistor and drain electrode also and be connected to protective resistance R1.
Its operation principle is: utilize optocoupler pipe U1, detect the voltage Vout at output two ends, have only output polarity connect to after, optocoupler pipe U1 conducting, the grid power supply of giving N type field effect transistor Q1, N type field effect transistor Q1 conducting, charger and battery are connected, and charge the battery.The utility model can be regardless of the priority of Vin and Vout and connect, when formerly connecting Vin, because the voltage of capacitor C 1 can not suddenly change, the control end voltage of optocoupler U1 is zero, not conducting of optocoupler, the grid of N type field effect transistor Q1 can not get voltage, so N type field effect transistor Q1 still is in off state; During anti-or short circuit, the control end voltage of optocoupler U1 is negative value or is zero not conducting of optocoupler that no matter whether connect the Vin charge power supply, the grid of N type field effect transistor Q1 all can not get voltage in the output termination, and N type field effect transistor Q1 still is in off state; N type field effect transistor Q1 could conducting when having only output end vo ut correctly to be connected with battery polar, connects anti-protection system and does not connect anti-because of polarity or short circuit causes damage thereby protected.
When if charging current is very big, can also be connected in parallel at the output pin of optocoupler pipe U1 2,3 or a plurality of N type field effect transistor realize the protection of large current charge device.
Claims (3)
1. a charger connects instead; short-circuit protection circuit; it is characterized in that; comprise that one is used to detect the optocoupler pipe U1 of charger output end voltage; two input pins of optocoupler pipe U1 are respectively by resistance R 1; R2 is connected with the output head anode of charger; the output pin of optocoupler pipe U1 is connected with the grid of at least one N type field effect transistor; the cathode output end that the drain electrode of described N type field effect transistor and source electrode are serially connected in charger; between the input and output pin of described optocoupler pipe U1 also and be connected to resistance R 4 and capacitor C 1, between the grid of described N type field effect transistor and drain electrode also and be connected to protective resistance R1.
2. charger according to claim 1 connects instead, short-circuit protection circuit, it is characterized in that, is connected with a N type field effect transistor on the output pin of described optocoupler pipe U1.
3. charger according to claim 1 connects instead, short-circuit protection circuit, it is characterized in that, is connected in parallel to 2,3 or a plurality of N type field effect transistor on the output pin of described optocoupler pipe U1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201615062U CN202059164U (en) | 2011-05-20 | 2011-05-20 | Protective circuit for inverse connection and short circuit of charger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201615062U CN202059164U (en) | 2011-05-20 | 2011-05-20 | Protective circuit for inverse connection and short circuit of charger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202059164U true CN202059164U (en) | 2011-11-30 |
Family
ID=45019128
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201615062U Expired - Fee Related CN202059164U (en) | 2011-05-20 | 2011-05-20 | Protective circuit for inverse connection and short circuit of charger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202059164U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103023011A (en) * | 2013-01-10 | 2013-04-03 | 山东润峰电子科技有限公司 | Full-automatic quick reverse-connection protective charger |
| CN103337883A (en) * | 2013-06-14 | 2013-10-02 | 成都锐奕信息技术有限公司 | Anti-reverse charger |
| CN104426145A (en) * | 2013-09-09 | 2015-03-18 | 海洋王（东莞）照明科技有限公司 | Inverse connection prevention circuit and lamp |
-
2011
- 2011-05-20 CN CN2011201615062U patent/CN202059164U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103023011A (en) * | 2013-01-10 | 2013-04-03 | 山东润峰电子科技有限公司 | Full-automatic quick reverse-connection protective charger |
| CN103337883A (en) * | 2013-06-14 | 2013-10-02 | 成都锐奕信息技术有限公司 | Anti-reverse charger |
| CN104426145A (en) * | 2013-09-09 | 2015-03-18 | 海洋王（东莞）照明科技有限公司 | Inverse connection prevention circuit and lamp |
| CN104426145B (en) * | 2013-09-09 | 2018-09-11 | 海洋王（东莞）照明科技有限公司 | Prevent reversed circuit and lamps and lanterns |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111130 Termination date: 20120520 |