CN203722230U - Simple protective circuit against reversal connection of power supply - Google Patents
Simple protective circuit against reversal connection of power supply Download PDFInfo
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- CN203722230U CN203722230U CN201320817368.8U CN201320817368U CN203722230U CN 203722230 U CN203722230 U CN 203722230U CN 201320817368 U CN201320817368 U CN 201320817368U CN 203722230 U CN203722230 U CN 203722230U
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- triode
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- power supply
- diode
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- 230000001681 protective effect Effects 0.000 title claims abstract description 12
- 239000003990 capacitor Substances 0.000 claims description 24
- 238000000034 method Methods 0.000 description 4
- 208000033999 Device damage Diseases 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
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- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model relates to a simple protective circuit against reversal connection of a power supply. The simple protective circuit is characterized by comprising a polarity selecting and voltage dividing circuit (1) and a triode conduction circuit (2), wherein the polarity selecting and voltage dividing circuit (1) and the triode conduction circuit (2) are sequentially connected in series between the two ends of the dc power supply, the polarity selecting and voltage dividing circuit (1) includes a power supply polarity gating and voltage dividing structure to realize voltage division and form a conduction control loop for the triode conduction circuit (2), the triode conduction circuit (2) is switched on/off to control the connected polarities of the dc power supply, and thus, reversal connection of the power supply is prevented. The simple protective circuit greatly improves the working current capability of the circuit, is low in heat, and also has the advantages of simple circuit structure, low cost and stable and reliable performance.
Description
Technical field
The utility model relates to a kind of plain type reverse power connection protective circuit, is applicable to the situation that occurs circuit power reversal connection, prevents from damaging components and parts.Belong to electronic protection circuit technical field.
Background technology
At present, in a lot of products that adopt external direct current power supply power supply, for example, power inverter equipment, the direct current of 12V or 24V is processed into the household electricity of 220V/50HZ, this series products in use, must correctly be distinguished connection to the both positive and negative polarity of power supply, prevent that input from occurring reverse power connection mistake so that damaging the components and parts in circuit, breaks down equipment.
In present technology, great majority adopt at the positive input terminal of power supply or a diode of negative input end series connection and cause damage of product to prevent reverse power connection, but the method is in the time that bearing power is larger, the electric current that flows through diode is very large, diode heating is serious, must install on the one hand the loose sheet of heat additional, cause that small product size is large, Heavy Weight, this diode becomes the hidden danger of circuit operation on the other hand.
Utility model content
The purpose of this utility model; large in order to solve anti-reverse diode caloric value in prior art DC power supply; the cost increase bringing and the problem of potential faults, provide a kind of plain type power supply reverse connection protection protective circuit, has the advantages that circuit structure is simple, cost is low and reliable and stable.
The purpose of this utility model can be by taking following technical scheme to reach:
A kind of plain type power supply reverse connection protection protective circuit, its design feature is: comprise polarity selection and bleeder circuit and triode turning circuit; Polarity selection and bleeder circuit are connected across the two ends of DC power supply after connecting with triode turning circuit order, polarity is selected and bleeder circuit has electric power polarity gating and bleeder circuit structure, form dividing potential drop and the conducting control loop to triode turning circuit, the Polarity Control triode turning circuit connecting by DC power supply is opened or ends, and prevents reverse power connection to realize.
The purpose of this utility model can also be by taking following technical scheme to reach:
Further, polarity selection and bleeder circuit can be in series by diode and divider resistance; Triode turning circuit can be formed by connecting by triode, resistance and polar capacitor EC1, and wherein, resistance is connected across between the base stage and emitter of triode, and one end of polar capacitor EC1 is connected with the collector electrode of triode, other end DC power supply connects.
Further, polarity is selected and bleeder circuit can be in series by resistance R 2, diode D2; Triode turning circuit can be made up of positive-negative-positive triode Q1, resistance R 1 and polar capacitor EC1; The anodal DC+ of power supply is connected with the emitter of triode Q1 with one end of resistance R 1, the other end of resistance R 1 is connected with one end of resistance R 2 with the base stage of triode Q1, the other end of resistance R 2 is connected with the anode of diode D2, the negative electrode of diode D2 is connected with the negative pole of polar capacitor EC1 and the negative pole DC-of power supply, and the collector electrode of triode Q1 is connected with the power supply electrode input end VDD of the positive pole of polar capacitor and product.
Further, polarity is selected and bleeder circuit can be in series by resistance R 2, diode D1; Triode turning circuit can be made up of NPN type triode Q2, resistance R 1 and polar capacitor EC2; The negative pole DC-of power supply is connected with the emitter of triode Q2 with one end of resistance R 1, the other end of resistance R 1 is connected with one end of resistance R 2 with the base stage of triode Q2, the other end of resistance R 1 is connected with the negative electrode of diode D1, the anode of diode D1 is connected with the positive pole of polar capacitor EC2 and the anodal DC+ of power supply, the collector electrode of triode Q2 and polar capacitor EC2 negative pole and the power supply negative input GND of product be connected.
The beneficial effects of the utility model are:
The utility model circuit is connected and composed by several common discrete electronic devices, utilize the saturation conduction characteristic of triode conducting, by bleeder circuit dividing potential drop, just connect with reversal connection process in, make conducting or cut-off between transistor emitter and collector electrode, make DC power supply be output as next stage circuit supply.Because the collector electrode of triode can be operated under large electric current, triode caloric value is little, has greatly improved safety and the stability of circuit, has the beneficial effect that circuit structure is simple, cost is low and reliable and stable.
Brief description of the drawings
Fig. 1 is the circuit theory diagrams of the utility model specific embodiment 1.
Fig. 2 is the circuit theory diagrams of the utility model specific embodiment 2.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail:
Specific embodiment 1:
With reference to Fig. 1, the present embodiment comprises polarity selection and bleeder circuit 1 and triode turning circuit 2; After polarity is selected and bleeder circuit 1 is connected with triode turning circuit 2 orders, be connected across the two ends of DC power supply, polarity is selected and bleeder circuit 1 has electric power polarity gating and bleeder circuit structure, form dividing potential drop and the conducting control loop to triode turning circuit 2, the Polarity Control triode turning circuit 2 connecting by DC power supply is opened or ends, and prevents reverse power connection to realize.
In the present embodiment:
Polarity selection and bleeder circuit 1 are in series by diode and divider resistance; Triode turning circuit 2 is formed by connecting by triode, resistance and polar capacitor EC1, and wherein, resistance is connected across between the base stage and emitter of triode, and one end of polar capacitor EC1 is connected with the collector electrode of triode, other end DC power supply connects.
Polarity selection and bleeder circuit 1 are in series by resistance R 2, diode D2; Triode turning circuit 2 is made up of positive-negative-positive triode Q1, resistance R 1 and polar capacitor EC1; The anodal DC+ of power supply is connected with the emitter of triode Q1 with one end of resistance R 1, the other end of resistance R 1 is connected with one end of resistance R 2 with the base stage of triode Q1, the other end of resistance R 2 is connected with the anode of diode D2, the negative electrode of diode D2 is connected with the negative pole of polar capacitor EC1 and the negative pole DC-of power supply, and the collector electrode of triode Q1 is connected with the power supply electrode input end VDD of the positive pole of polar capacitor and product.
The operation principle of the present embodiment:
With reference to Fig. 1, the negative pole of the emitter of triode Q1 and diode D1 connects respectively the two ends of DC power supply, and the collector electrode of triode Q1 is connected to subordinate's circuit as output.Its job control process is as follows:
1, triode conducting, output voltage is to subordinate's circuit: in the time that the emitter of triode Q1 and the negative pole of diode D1 connect respectively the positive pole of DC power supply and negative pole, triode Q1 is in positively biased state, triode Q1 saturation conduction, the collector electrode output voltage of Q1 is for subordinate's circuit, and equipment is started working.
2, triode cut-off; subordinate's down circuitry is not worked: the negative pole that connects respectively DC power supply when the emitter of triode Q1 and the negative pole reversal connection of diode D1 is when anodal; triode Q1 is in reverse-biased state; triode Q1 cut-off; the collector output Non voltage output of Q1 is for subordinate's circuit; equipment is not worked, and has protected the safety of subordinate's circuit, prevents device damage.
Specific embodiment 2:
With reference to Fig. 2, the feature of this embodiment is:
Polarity selection and bleeder circuit 1 are in series by resistance R 2, diode D1; Triode turning circuit 2 is made up of NPN type triode Q2, resistance R 1 and polar capacitor EC2; The negative pole DC-of power supply is connected with the emitter of triode Q2 with one end of resistance R 1, the other end of resistance R 1 is connected with one end of resistance R 2 with the base stage of triode Q2, the other end of resistance R 1 is connected with the negative electrode of diode D1, the anode of diode D1 is connected with the positive pole of polar capacitor EC2 and the anodal DC+ of power supply, the collector electrode of triode Q2 and polar capacitor EC2 negative pole and the power supply negative input GND of product be connected.
All the other are identical with the structure of specific embodiment 1.
The operation principle of the present embodiment:
With reference to Fig. 2, the positive pole of the emitter of triode Q1 and diode D1 connects respectively the two ends of DC power supply, and the collector electrode of triode Q1 is connected to subordinate's circuit as output.Its job control process is as follows:
1, triode conducting, output voltage is to subordinate's circuit: the negative pole that connects respectively DC power supply when the emitter of triode Q1 and the positive pole of diode D1 is when anodal, triode Q1 is in positively biased state, triode Q1 saturation conduction, the collector electrode output voltage of Q1 is for subordinate's circuit, and equipment is started working.
2, triode cut-off; subordinate's down circuitry is not worked: in the time that the emitter of triode Q1 and the anodal reversal connection of diode D1 connect respectively the positive pole of DC power supply and negative pole; triode Q1 is in reverse-biased state; triode Q1 cut-off; the collector output Non voltage output of Q1 is for subordinate's circuit; equipment is not worked, and has protected the safety of subordinate's circuit, prevents device damage.
The above; it is only preferably specific embodiment of the utility model; but protection range of the present utility model is not limited to this; any be familiar with those skilled in the art the utility model disclose scope in; be equal to replacement or changed according to the technical solution of the utility model and utility model design thereof, all being belonged to protection range of the present utility model.
Claims (4)
1. a plain type reverse power connection protective circuit, is characterized in that: comprise polarity selection and bleeder circuit (1) and triode turning circuit (2); After polarity is selected and bleeder circuit (1) is connected with triode turning circuit (2) order, be connected across the two ends of DC power supply, polarity is selected and bleeder circuit (1) has electric power polarity gating and bleeder circuit structure, form dividing potential drop and the conducting control loop to triode turning circuit (2), the Polarity Control triode turning circuit (2) connecting by DC power supply is opened or ends, and prevents reverse power connection to realize.
2. a kind of plain type reverse power connection protective circuit according to claim 1, is characterized in that: polarity selection and bleeder circuit (1) are in series by diode and divider resistance; Triode turning circuit (2) is formed by connecting by triode, resistance and polar capacitor EC1, and wherein, resistance is connected across between the base stage and emitter of triode, and one end of polar capacitor EC1 is connected with the collector electrode of triode, other end DC power supply connects.
3. a kind of plain type reverse power connection protective circuit according to claim 2, is characterized in that: polarity selection and bleeder circuit (1) are in series by resistance R 2, diode D2; Triode turning circuit (2) is made up of positive-negative-positive triode Q1, resistance R 1 and polar capacitor EC1; The anodal DC+ of power supply is connected with the emitter of triode Q1 with one end of resistance R 1, the other end of resistance R 1 is connected with one end of resistance R 2 with the base stage of triode Q1, the other end of resistance R 2 is connected with the anode of diode D2, the negative electrode of diode D2 is connected with the negative pole of polar capacitor EC1 and the negative pole DC-of power supply, and the collector electrode of triode Q1 is connected with the power supply electrode input end VDD of the positive pole of polar capacitor and product.
4. a kind of plain type reverse power connection protective circuit according to claim 2, is characterized in that: polarity selection and bleeder circuit (1) are in series by resistance R 2, diode D1; Triode turning circuit (2) is made up of NPN type triode Q2, resistance R 1 and polar capacitor EC2; The negative pole DC-of power supply is connected with the emitter of triode Q2 with one end of resistance R 1, the other end of resistance R 1 is connected with one end of resistance R 2 with the base stage of triode Q2, the other end of resistance R 1 is connected with the negative electrode of diode D1, the anode of diode D1 is connected with the positive pole of polar capacitor EC2 and the anodal DC+ of power supply, the collector electrode of triode Q2 and polar capacitor EC2 negative pole and the power supply negative input GND of product be connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320817368.8U CN203722230U (en) | 2013-12-11 | 2013-12-11 | Simple protective circuit against reversal connection of power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320817368.8U CN203722230U (en) | 2013-12-11 | 2013-12-11 | Simple protective circuit against reversal connection of power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203722230U true CN203722230U (en) | 2014-07-16 |
Family
ID=51161356
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320817368.8U Expired - Lifetime CN203722230U (en) | 2013-12-11 | 2013-12-11 | Simple protective circuit against reversal connection of power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203722230U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105186599A (en) * | 2015-08-04 | 2015-12-23 | 广东瑞德智能科技股份有限公司 | Circuit preventing reverse connection and reverse charging of solar controller |
| CN105470045A (en) * | 2015-12-29 | 2016-04-06 | 上海辰竹仪表有限公司 | Starting circuit and method for safety relay |
| CN107947552A (en) * | 2017-12-20 | 2018-04-20 | 四川九洲电器集团有限责任公司 | With anti-reverse and suppression input peak current power module |
-
2013
- 2013-12-11 CN CN201320817368.8U patent/CN203722230U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105186599A (en) * | 2015-08-04 | 2015-12-23 | 广东瑞德智能科技股份有限公司 | Circuit preventing reverse connection and reverse charging of solar controller |
| CN105470045A (en) * | 2015-12-29 | 2016-04-06 | 上海辰竹仪表有限公司 | Starting circuit and method for safety relay |
| CN105470045B (en) * | 2015-12-29 | 2019-05-17 | 上海辰竹仪表有限公司 | A kind of start-up circuit and method for safety relay |
| CN107947552A (en) * | 2017-12-20 | 2018-04-20 | 四川九洲电器集团有限责任公司 | With anti-reverse and suppression input peak current power module |
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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: 20140716 |
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| CX01 | Expiry of patent term |