CN103337883A - Anti-reverse charger - Google Patents
Anti-reverse charger Download PDFInfo
- Publication number
- CN103337883A CN103337883A CN201310233413XA CN201310233413A CN103337883A CN 103337883 A CN103337883 A CN 103337883A CN 201310233413X A CN201310233413X A CN 201310233413XA CN 201310233413 A CN201310233413 A CN 201310233413A CN 103337883 A CN103337883 A CN 103337883A
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- Prior art keywords
- field effect
- grounding ports
- comparator
- circuit
- effect transistor
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Protection Of Static Devices (AREA)
Abstract
The invention discloses an anti-reverse charger which comprises a protection circuit, the protection circuit is arranged between a grounding port and an internal circuit, and comprises a resistor R1, a comparator M and a field-effect tube Q, wherein a source electrode of the filed-effect tube Q is connected with the grounding port, a drain electrode is connected with the internal circuit, one end of the resistor R1 is connected with the drain electrode of the filed-effect tube Q, the other end is grounded, two inputs of the comparator M are respectively connected with two ends of the resistor R1, and an output is connected with a grid electrode of the filed-effect tube Q. The anti-reverse charger has the benefits that when the grounding port of the charger is connected with a power supply, the circuit is started to cut off the connection between the grounding port and the internal circuit, so that the charger is protected.
Description
Technical field
The present invention relates to a kind of protective circuit, particularly relate to a kind of anti-reverse charger.
Background technology
A lot of chargers all are provided with charging port and grounding ports, and during charging, charging port connects power supply, grounding ports ground connection can be carried out quick charge to electric, but when grounding ports connects power supply, the charger internal circuit causes counter-rotating, can destroy the circuit in the charger.
Summary of the invention
The objective of the invention is to overcome the shortcoming and defect of above-mentioned prior art, a kind of anti-reverse charger is provided, after overcoming existing charger ground connection and connecting power supply, the defective that can damage internal circuit.
Purpose of the present invention is achieved through the following technical solutions: anti-reverse charger; comprise a protective circuit; protective circuit is arranged between grounding ports and the internal circuit; it comprises resistance R 1, comparator M and field effect transistor Q, and the source electrode of field effect transistor Q connects grounding ports, and drain electrode connects internal circuit; resistance R 1 one ends connect the drain electrode of field effect transistor Q; other end ground connection, two inputs of comparator M are connected respectively to the two ends of resistance R 1, and its output is connected to the grid of field effect transistor Q.In this circuit, when grounding ports connects power supply, namely produce pressure drop on the resistance R 1, thereby make comparator M upset, close swap switch device field effect transistor Q, cut off grounding ports and internal circuit, protected internal circuit effectively.
Further, above-mentioned grounding ports is to being provided with a protective resistance R2 between the source electrode of field effect pipe Q, and protection field effect transistor Q avoids field effect transistor Q to burn out.
Further, the positive source of above-mentioned comparator M connects grounding ports, power cathode ground connection, because this circuit only needs just to work when grounding ports connects power supply again, need not energising at other times, provided by grounding ports so comparator M starts power supply, after grounding ports connects power supply, start comparator, can not hinder the work of this circuit.
The invention has the beneficial effects as follows: when this circuit connects power supply in the charger grounding ports, namely start, block being connected between grounding ports and the internal circuit, protected charger.
Description of drawings
Fig. 1 is the structural representation of embodiment 1;
Fig. 2 is the structural representation of embodiment 2.
Embodiment
The present invention is described in further detail below in conjunction with embodiment, but structure of the present invention is not limited only to following examples:
[embodiment 1]
As shown in Figure 1; anti-reverse charger; comprise a protective circuit, protective circuit is arranged between grounding ports and the internal circuit, and it comprises resistance R 1, comparator M and field effect transistor Q; the source electrode of field effect transistor Q connects grounding ports; drain electrode connects internal circuit, and resistance R 1 one ends connect the drain electrode of field effect transistor Q, other end ground connection; two inputs of comparator M are connected respectively to the two ends of resistance R 1, and its output is connected to the grid of field effect transistor Q.In this circuit, when grounding ports connects power supply, namely produce pressure drop on the resistance R 1, thereby make comparator M upset, close swap switch device field effect transistor Q, cut off grounding ports and internal circuit, protected internal circuit effectively.
[embodiment 2]
As shown in Figure 2, present embodiment is on the basis of embodiment 1, and to being provided with a protective resistance R2 between the source electrode of field effect pipe Q, protection field effect transistor Q avoids field effect transistor Q to burn out in grounding ports.
The positive source of the comparator M of present embodiment connects grounding ports, power cathode ground connection, because this circuit only needs just to work when grounding ports connects power supply again, need not energising at other times, so starting power supply, comparator M provided by grounding ports, after grounding ports connects power supply, start comparator, can not hinder the work of this circuit.
Claims (3)
1. anti-reverse charger; it is characterized in that; comprise a protective circuit, protective circuit is arranged between grounding ports and the internal circuit, and it comprises resistance R 1, comparator M and field effect transistor Q; the source electrode of field effect transistor Q connects grounding ports; drain electrode connects internal circuit, and resistance R 1 one ends connect the drain electrode of field effect transistor Q, other end ground connection; two inputs of comparator M are connected respectively to the two ends of resistance R 1, and its output is connected to the grid of field effect transistor Q.
2. anti-reverse charger according to claim 1 is characterized in that, described grounding ports is to being provided with a protective resistance R2 between the source electrode of field effect pipe Q.
3. anti-reverse charger according to claim 1 is characterized in that, the positive source of described comparator M connects grounding ports, power cathode ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310233413XA CN103337883A (en) | 2013-06-14 | 2013-06-14 | Anti-reverse charger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310233413XA CN103337883A (en) | 2013-06-14 | 2013-06-14 | Anti-reverse charger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103337883A true CN103337883A (en) | 2013-10-02 |
Family
ID=49246001
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310233413XA Pending CN103337883A (en) | 2013-06-14 | 2013-06-14 | Anti-reverse charger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103337883A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202059164U (en) * | 2011-05-20 | 2011-11-30 | 梁干 | Protective circuit for inverse connection and short circuit of charger |
| CN202455064U (en) * | 2011-12-16 | 2012-09-26 | 濮阳三友电器有限公司 | Reverse-connection preventing alarm circuit |
| CN203278356U (en) * | 2013-06-14 | 2013-11-06 | 成都锐奕信息技术有限公司 | Charger with reversal connection protection function |
-
2013
- 2013-06-14 CN CN201310233413XA patent/CN103337883A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202059164U (en) * | 2011-05-20 | 2011-11-30 | 梁干 | Protective circuit for inverse connection and short circuit of charger |
| CN202455064U (en) * | 2011-12-16 | 2012-09-26 | 濮阳三友电器有限公司 | Reverse-connection preventing alarm circuit |
| CN203278356U (en) * | 2013-06-14 | 2013-11-06 | 成都锐奕信息技术有限公司 | Charger with reversal connection protection function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20131002 |