CN205248774U - Reverse -connection protective circuit is prevented in input - Google Patents
Reverse -connection protective circuit is prevented in input Download PDFInfo
- Publication number
- CN205248774U CN205248774U CN201521000062.9U CN201521000062U CN205248774U CN 205248774 U CN205248774 U CN 205248774U CN 201521000062 U CN201521000062 U CN 201521000062U CN 205248774 U CN205248774 U CN 205248774U
- Authority
- CN
- China
- Prior art keywords
- input
- circuit
- switching power
- reverse connection
- semiconductor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The utility model discloses a reverse -connection protective circuit is prevented in input for for providing, switching power supply circuit 203 joins conversely protect function, including positive input U+, power negative pole input U -, reverse -connection protective circuit is prevented in input unit 201 and stepup transformer 202, reverse -connection protective circuit is prevented in input unit 201 include MOS pipe T1, through grid voltage control the switching on and turn -offing of MOS pipe T1, in order to realize switching power supply circuit 203 prevent joining conversely the function, stepup transformer 202 at least including three binding post: input 1, earthing terminal 2 and output 3, input 1 connect positive input U+, through will the voltage of input 1 carry after handling through stepping up the reverse -connection protective circuit unit 201 prevented make with the voltage that provides enough high MOS pipe T1 saturated conduction, switching power supply circuit 203 at least including two inputs: + vin and - vin. The utility model discloses the circuit on -state impedance of reverse -connection protective circuit is prevented in input when input voltage is lower has been reduced to the power consumption of circuit has been reduced.
Description
Technical field
The utility model relates to switching power circuit field, and particularly a kind of input of switching power circuit of low input is anti-Reverse-connection protection circuit.
Background technology
In electronic system, have many independently power modules, the input of power module mainly leans on the mode of machinery or pattern identificationDistinguish polarity, guiding scheme is provided. But this can not stop input reversal connection phenomenon, once and reversal connection is incited somebody to actionCan damage input voltage port, cause power module to burn, severe patient can cause the situation such as power supply or battery failure, entersAnd cause economic loss.
At present, the following two kinds of modes of the many employings of common anti-reverse circuit:
1, utilize the one-way conduction characteristic of diode to realize the anti-reverse of circuit; Described anti-reverse method is due to the forward of diodeConduction voltage drop is larger, and in the time that the current ratio that flows through diode is larger, the energy comparison of circuit loss is large, can bear in addition forwardAlso there is defect in the aspects such as the diode manufacturing process difficulty that On current is large is large, and cost is high, reliability;
2, utilize the switching characteristic of metal-oxide-semiconductor to realize the anti-reverse of circuit, by conducting and the shutoff of grid voltage control metal-oxide-semiconductor,To realize the anti-reverse function of circuit, as shown in Figure 1:
In Fig. 1, the supply voltage of described input reverse connection prevention protection circuit is directed to the voltage of input, when the voltage of inputWhen enough height make metal-oxide-semiconductor T1 saturation conduction, can realize the On-resistance that reduces input reverse connection prevention protection circuit, but this reduction is defeatedThe effect that enters the On-resistance of reverse connection prevention protection circuit only makes the feelings of metal-oxide-semiconductor T1 saturation conduction for the enough height of voltage of inputCondition, when supply voltage deficiency so that metal-oxide-semiconductor T1 saturation conduction even because of the too low deficiency of supply voltage so that when metal-oxide-semiconductor T1 conducting, shouldAnti-reverse metal-oxide-semiconductor is in unsaturated conducting or only have the state of body diode conducting, and On-resistance is larger, the power attenuation causingLarger, if when operating current is larger, this metal-oxide-semiconductor heating is serious, even can damage.
Utility model content
In order to overcome the shortcoming of above-mentioned prior art, the purpose of this utility model is to provide a kind of input reverse connection prevention protection circuit,Realize in the time of the metal-oxide-semiconductor saturation conduction of the not enough so that input reverse connection prevention protection circuit of input voltage, still there is the anti-reverse protection of inputFunction also reduces the loss of circuit.
In order to achieve the above object, technical solutions of the utility model are as follows:
A kind of input reverse connection prevention protection circuit, is used to switching power circuit 203 that reversal connection protection function is provided, and comprises that positive source is defeatedEnter to hold U+, power cathode input U-, input reverse connection prevention protection circuit unit 201 and stepup transformer 202; Input anti-reverse protection electricityUnit, road 201 comprises the first metal-oxide-semiconductor T1, by conducting and the shutoff of grid voltage control the first metal-oxide-semiconductor T1, to realize switch electricityThe anti-reverse function of source circuit 203; Stepup transformer 202 at least comprises three binding posts: input 1, and earth terminal 2 and output 3,Input 1 meets positive source input U+, after the voltage of its input 1 is processed through boosting, is transported to reverse connection prevention protection circuitUnit 201 is to provide sufficiently high voltage to make the first metal-oxide-semiconductor T1 saturation conduction; Switching power circuit 203 at least comprises two inputsEnd :+Vin and-Vin.
Preferably, input reverse connection prevention protection circuit unit 201 also comprises the first resistance R 1, the second resistance R 2, the first Zener diodeZ1 and the first diode D1; The output 3 of the first described resistance R 1 one termination stepup transformers 202, another termination the first metal-oxide-semiconductor T1Grid, one end of the second resistance R 2 and the negative electrode of the first Zener diode Z1; The drain electrode of the first metal-oxide-semiconductor T1 connects the first diodeD1 negative electrode and the negative input U-of power supply; The source electrode of the first metal-oxide-semiconductor T1 connects the other end, first voltage stabilizing two of the second resistance R 2The anode of utmost point pipe Z1, the earth terminal 2 of stepup transformer 202 and switching power circuit 203-Vin end; The electrode input end U+ of power supplyThe input 1 of connection stepup transformer 202 and switching power circuit+Vin end.
Preferably, described switch electricity input reverse connection prevention protection circuit is integrated in switching power circuit 203 inside, as Switching Power SupplyA junior unit circuit of circuit 203 inside.
Preferably, described switching power circuit 203 is switching power circuits of input tape polarity, and particularly low-voltage is inputtedDC-DC switching power circuit.
Preferably, described switching power circuit 203 is late-class circuits of input tape polarity, particularly the rear class electricity of low-voltage inputRoad.
Preferably, the first described diode D1 is the body diode of the first metal-oxide-semiconductor T1.
Principle Analysis of the present utility model is as follows:
In the time of normal wiring, positive source input U+ and power cathode input U-are just being connected respectively power supply or batteryThe utmost point and negative pole, in the time that stepup transformer 202 is not yet exported enough high voltages and is made the first metal-oxide-semiconductor T1 conducting, the first diode D1 conducting,Form current loop, after stepup transformer 202 work, export enough high voltages and make the first metal-oxide-semiconductor T1 saturation conduction, the first metal-oxide-semiconductor T1When saturation conduction, on-state internal resistance is minimum, approximate short circuit, and like this, input current flows to from the input+Vin of switching power circuit 203Input-Vin, then get back to the negative pole of power supply or battery by the first metal-oxide-semiconductor T1 of saturation conduction, form a path,Switching power circuit 203 is normally worked;
If accidentally the both positive and negative polarity of power supply or battery has been connect instead, the positive pole of power supply or battery is receivedPower cathode input U-is upper, and it is upper that the negative pole of power supply or battery is received positive source input U+, like this, just has negativeVoltage is input to the drain electrode of the first metal-oxide-semiconductor T1 and the negative electrode of the first diode D1, because the first metal-oxide-semiconductor T1 does not have positive grid voltage,The first metal-oxide-semiconductor T1 cut-off; Due to the one-way conduction characteristic of the first diode D1, the first diode D1 ends, the first metal-oxide-semiconductor T1 againCut-off, circuit is equivalent to open circuit, and electric current can not form loop. So just avoid causing damage to switching power circuit 203 belowBad, thus the economic loss that may cause reduced.
Compared with prior art, in above-mentioned switch electricity input reverse connection prevention protection circuit road, played while preventing circuit reversal connection and madeThe economic loss that the switching power circuit internal components becoming damages, and in the lower application scenario of power input voltage ratio, defeatedThe voltage that enters end is transported to the grid of the first metal-oxide-semiconductor T1 after boosting, and makes the first metal-oxide-semiconductor T1 saturation conduction, reduces the logical of circuitState impedance, thus the power attenuation of circuit reduced.
Brief description of the drawings
Fig. 1 is prior art input reverse connection prevention protection circuit road schematic diagram;
Fig. 2 is the utility model input reverse connection prevention protection circuit road;
Fig. 3 is circuit theory diagrams of the stepup transformer in the utility model input reverse connection prevention protection circuit road.
Detailed description of the invention
Case study on implementation one
Refer to Fig. 2, a kind of input reverse connection prevention protection circuit road, is used to switching power circuit 203 that reversal connection protection function is provided,Comprise positive source input U+, power cathode input U-, input unit 201, reverse connection prevention protection circuit road and stepup transformer 202;Input unit, reverse connection prevention protection circuit road 201 comprises the first resistance R 1, the second resistance R 2, the first Zener diode Z1, a MOSPipe T1 and the first diode D1; Stepup transformer 202 at least comprises three binding posts: input 1, earth terminal 2, output 3;Switching power circuit 203 at least comprise two input :+Vin and-Vin; The output 3 of the first resistance R 1 one termination stepup transformers 202,Grid, one end of the second resistance R 2 and the negative electrode of the first Zener diode Z1 of another termination the first metal-oxide-semiconductor T1; The first metal-oxide-semiconductor T1Drain electrode connect the D1 negative electrode of the first diode and the negative input U-of power supply; The source electrode of the first metal-oxide-semiconductor T1 connects the second resistance R 2The earth terminal 2 of anode, stepup transformer 202 of the other end, the first Zener diode Z1 and switching power circuit 203-Vin end;The input 1 of the electrode input end U+ connection stepup transformer 202 of power supply and switching power circuit+Vin end.
Refer to Fig. 3, above-mentioned stepup transformer 202 comprises three binding posts again: input 1, earth terminal 2, output 3, and bagDraw together capacitor C 31, C32 and C33, inductance L 31, resistance R 31, R32 and R33, diode D31, NPN triode Q31 and BOOSTControl chip IC31; Control chip IC31 comprises 5 pin: VDD, VSS, EXT, NC and VOUT; The input 1 of stepup transformer 202Connect one end, one end of capacitor C 31 and the VDD pin of control chip IC31 of inductance L 31; The other end of inductance L 31 connects twoThe anode of utmost point pipe D31, the colelctor electrode of triode Q31; The EXT pin of control chip C31 is connected to triode Q31 after resistance R 31Base stage; The anode of diode D31 is connected with one end of capacitor C 32 with one end of resistance R 32 and is connected to the output of stepup transformer 202End 3; The other end of resistance R 32 is connected with the VOUT pin of one end of R33 and control chip; The other end of resistance R 33 and electric capacityThe VSS pin of the other end of C31, the other end of capacitor C 32 and control chip IC31 is connected and is connected to the ground connection of stepup transformer 202End 2, capacitor C 33 is connected in parallel on resistance R 32 two ends.
Operation principle is analyzed in utility model content, further sketches here in conjunction with the operation principle of stepup transformer: stepup transformer 202For BOOST booster circuit, the present embodiment is the common application of the one of control chip S-8358E50, for a kind of ultralow quiescent dissipation,The BOOST circuit controller of booster type microminiature 600kHz, the intrinsic standoff ratio of regulating resistance R33 and R32, can change output 3Voltage, between 7.5V to 15V, here all containing given figure, total resistance of resistance R 32 and R33 can be greater than 1M, to fallLow speed paper tape reader static power disspation.
In the time of normal wiring, positive source input U+ and power cathode input U-are just being connected respectively power supply or batteryThe utmost point and negative pole, not yet export enough high voltages at stepup transformer 202 and made for the first metal-oxide-semiconductor T1 conducting moment, the first diode D1 conducting,After stepup transformer 202 work, export enough high voltages and make the first metal-oxide-semiconductor T1 saturation conduction, on-state when the first metal-oxide-semiconductor T1 saturation conductionInternal resistance is minimum, approximate short circuit, and like this, input current flows to input-Vin from the input+Vin of switching power circuit 203, thenGet back to the negative pole of power supply or battery by the first metal-oxide-semiconductor T1 of saturation conduction, form a path, make switching power circuit203 normally work.
If accidentally the both positive and negative polarity of power supply or battery has been connect instead, the positive pole of power supply or battery is receivedPower cathode input U-is upper, and it is upper that the negative pole of power supply or battery is received positive source input U+, like this, just has negativeVoltage is input to the drain electrode of the first metal-oxide-semiconductor T1 and the negative electrode of the first diode D1, because the first metal-oxide-semiconductor T1 does not have positive grid voltage,The first metal-oxide-semiconductor T1 cut-off; Due to the one-way conduction characteristic of the first diode D1, the first diode D1 ends, the first metal-oxide-semiconductor T1 againCut-off, circuit is equivalent to open circuit, and electric current can not form loop. So just avoid causing damage to switching power circuit 203 belowBad, thus the economic loss that may cause reduced.
Below be only preferred embodiment of the present utility model, it should be pointed out that above-mentioned preferred embodiment should not be considered as thisThe restriction of invention.
For those skilled in the art, not departing from spirit and scope of the present utility model, by more thanDescribe with can naturally associate for example other be equal to application scheme, can also make some improvements and modifications, as stepup transformer 202Control chip change booster circuit that other BOOST circuit control IC and other peripheral circuits make into, in current supply circuit, seal in electricitySense, and upper electric capacity with the ripple of smoothly powering, on divider resistance, feedback resistance, anti-dry sorrow electric capacity in parallel, improves the anti-dry of circuitDisturb ability, these improvements and modifications also should be considered as protection domain of the present utility model, no longer repeat this practicality here with embodimentNovel protection domain should be as the criterion with claim limited range.
Claims (8)
1. an input reverse connection prevention protection circuit, be used to switching power circuit (203) that reversal connection protection function is provided, comprise positive source input (U+), power cathode input (U-), input reverse connection prevention protection circuit unit (201) and stepup transformer (202); Described input reverse connection prevention protection circuit unit (201) comprises the first metal-oxide-semiconductor (T1), by conducting and the shutoff of the first metal-oxide-semiconductor (T1) described in grid voltage control, to realize the anti-reverse function of described switching power circuit (203); Described stepup transformer (202) at least comprises three binding posts: input (1), earth terminal (2) and output (3), described input (1) connects described positive source input (U+), is transported to described reverse connection prevention protection circuit unit (201) to provide sufficiently high voltage to make described the first metal-oxide-semiconductor (T1) saturation conduction by after the voltage of described input (1) is processed through boosting; Described switching power circuit (203) at least comprise two input :+Vin and-Vin.
2. input reverse connection prevention protection circuit according to claim 1, is characterized in that: described input reverse connection prevention protection circuit unit (201) also comprises the first resistance (R1), the second resistance (R2), the first Zener diode (Z1) and the first diode (D1); The output (3) of the stepup transformer (202) described in described the first resistance (R1) termination, the negative electrode of one end of the grid of the first metal-oxide-semiconductor (T1) described in another termination, described the second resistance (R2) and described the first Zener diode (Z1); The negative input (U-) of (D1) negative electrode of the first diode described in the drain electrode of described the first metal-oxide-semiconductor (T1) connects and described power supply; The earth terminal (2) of the anode of the other end of the second resistance (R2) described in the source electrode of described the first metal-oxide-semiconductor (T1) connects, described the first Zener diode (Z1), described stepup transformer (202) and described switching power circuit (203)-Vin end; The input (1) of the stepup transformer (202) described in the electrode input end (U+) of described power supply connects and described switching power circuit+Vin end.
3. input reverse connection prevention protection circuit according to claim 2, is characterized in that: described the first diode (D1) is the body diode of the first metal-oxide-semiconductor (T1).
4. input reverse connection prevention protection circuit according to claim 1 and 2, is characterized in that: it is integrated in described switching power circuit (203) inside, as an inner junior unit circuit of switching power circuit (203).
5. input reverse connection prevention protection circuit according to claim 1 and 2, is characterized in that: described switching power circuit (203) is the switching power circuit of input tape polarity.
6. input reverse connection prevention protection circuit according to claim 5, is characterized in that: the switching power circuit of described input tape polarity is the DC-DC switching power circuit of low-voltage input.
7. input reverse connection prevention protection circuit according to claim 1 and 2, is characterized in that: described switching power circuit (203) is the late-class circuit of input tape polarity.
8. input reverse connection prevention protection circuit according to claim 7, is characterized in that: the late-class circuit of described input tape polarity is the late-class circuit of low-voltage input.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521000062.9U CN205248774U (en) | 2015-12-04 | 2015-12-04 | Reverse -connection protective circuit is prevented in input |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521000062.9U CN205248774U (en) | 2015-12-04 | 2015-12-04 | Reverse -connection protective circuit is prevented in input |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205248774U true CN205248774U (en) | 2016-05-18 |
Family
ID=55947847
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521000062.9U Active CN205248774U (en) | 2015-12-04 | 2015-12-04 | Reverse -connection protective circuit is prevented in input |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205248774U (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106849050A (en) * | 2017-03-30 | 2017-06-13 | 鑫雁电子科技（上海）有限公司 | The application of reverse-connection protection circuit, H bridge output driving chips and the driving chip |
| CN107910849A (en) * | 2017-12-12 | 2018-04-13 | 深圳市菲菱科思通信技术股份有限公司 | Overvoltage, reversal connection and power-down protection circuit |
| WO2018076294A1 (en) * | 2016-10-28 | 2018-05-03 | 海能达通信股份有限公司 | Reverse connection and current backflow prevention circuit |
| CN109546624A (en) * | 2019-01-25 | 2019-03-29 | 帝森克罗德集团有限公司 | DC-DC power source protects circuit |
| CN110445117A (en) * | 2019-08-13 | 2019-11-12 | 苏州格远电气有限公司 | Direct current inputs reverse connection prevention protection circuit |
| CN110509772A (en) * | 2018-05-22 | 2019-11-29 | 联合汽车电子有限公司 | Accessory power supply |
| CN111342442A (en) * | 2020-04-07 | 2020-06-26 | 达闼机器人有限公司 | Reverse connection prevention power supply protection circuit, power supply management system and robot |
| CN111416333A (en) * | 2020-04-23 | 2020-07-14 | 长沙德壹科技有限公司 | Power supply reverse connection prevention method and power supply reverse connection prevention circuit |
| CN112003242A (en) * | 2020-08-03 | 2020-11-27 | 珠海格力电器股份有限公司 | Protection device and method for IGBT (insulated Gate Bipolar transistor) driving power supply in automobile and automobile |
| CN117578860A (en) * | 2024-01-16 | 2024-02-20 | 杭州海创自动化有限公司 | Voltage output conversion system |
-
2015
- 2015-12-04 CN CN201521000062.9U patent/CN205248774U/en active Active
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018076294A1 (en) * | 2016-10-28 | 2018-05-03 | 海能达通信股份有限公司 | Reverse connection and current backflow prevention circuit |
| CN106849050A (en) * | 2017-03-30 | 2017-06-13 | 鑫雁电子科技（上海）有限公司 | The application of reverse-connection protection circuit, H bridge output driving chips and the driving chip |
| CN107910849B (en) * | 2017-12-12 | 2024-05-03 | 深圳市菲菱科思通信技术股份有限公司 | Overvoltage, reverse connection and power failure protection circuit |
| CN107910849A (en) * | 2017-12-12 | 2018-04-13 | 深圳市菲菱科思通信技术股份有限公司 | Overvoltage, reversal connection and power-down protection circuit |
| CN110509772A (en) * | 2018-05-22 | 2019-11-29 | 联合汽车电子有限公司 | Accessory power supply |
| CN109546624A (en) * | 2019-01-25 | 2019-03-29 | 帝森克罗德集团有限公司 | DC-DC power source protects circuit |
| CN110445117A (en) * | 2019-08-13 | 2019-11-12 | 苏州格远电气有限公司 | Direct current inputs reverse connection prevention protection circuit |
| CN111342442A (en) * | 2020-04-07 | 2020-06-26 | 达闼机器人有限公司 | Reverse connection prevention power supply protection circuit, power supply management system and robot |
| CN111416333A (en) * | 2020-04-23 | 2020-07-14 | 长沙德壹科技有限公司 | Power supply reverse connection prevention method and power supply reverse connection prevention circuit |
| CN112003242A (en) * | 2020-08-03 | 2020-11-27 | 珠海格力电器股份有限公司 | Protection device and method for IGBT (insulated Gate Bipolar transistor) driving power supply in automobile and automobile |
| CN112003242B (en) * | 2020-08-03 | 2021-07-30 | 珠海格力电器股份有限公司 | Protection device and method for IGBT (insulated Gate Bipolar transistor) driving power supply in automobile and automobile |
| CN117578860A (en) * | 2024-01-16 | 2024-02-20 | 杭州海创自动化有限公司 | Voltage output conversion system |
| CN117578860B (en) * | 2024-01-16 | 2024-04-09 | 杭州海创自动化有限公司 | Voltage output conversion system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN205248774U (en) | Reverse -connection protective circuit is prevented in input | |
| CN104604134B (en) | Semiconductor device | |
| CN102013802B (en) | BOOST circuit with short circuit protection function | |
| CN106786395B (en) | protection circuit and method | |
| CN101872971A (en) | Reverse-connection preventing circuit, reverse-connection preventing processing method and communication equipment | |
| CN203180783U (en) | Boosted circuit | |
| CN102970791B (en) | Light-emitting diode (LED) constant current driving circuit and LED lamp | |
| CN108462163B (en) | Meet the direct current reverse-connection preventing circuit of negative sense surge requirement | |
| CN103699169A (en) | Power supply circuit | |
| CN114157131A (en) | Surge suppression circuit for switching power supply | |
| CN106533144B (en) | Anti-reverse and current flowing backwards circuit | |
| CN209994110U (en) | NMOS tube-based reverse connection prevention protection circuit for vehicle-mounted direct-current power supply | |
| CN108880230B (en) | Power sources in parallel control module and parallel system based on Switching Power Supply chopping voltage | |
| CN103036226A (en) | Low-cost and low-power-consumption power supply reverse connection protection circuit and protection method of the same | |
| CN202797867U (en) | Short circuit protection circuit and power supply circuit provided with the same | |
| CN204652214U (en) | A kind of little ripple DC conversion power | |
| CN103325523A (en) | Electromagnet protection circuit | |
| CN104682685A (en) | Power supply under-voltage protection circuit of isolating switch | |
| CN209313807U (en) | Electric charge recycling circuit, power supply circuit and switching power circuit system | |
| CN203859545U (en) | Single chip intelligent power supply with load state detection and multiple independent current limit output | |
| KR102328416B1 (en) | voltage absorption circuit | |
| CN103746358B (en) | Surge suppression circuit, switching device and set-top box | |
| CN202797902U (en) | Short circuit protection circuit used for booster circuit | |
| CN214798853U (en) | Capacitive load power-supply-preventing reverse connection driving control circuit | |
| CN217522739U (en) | Pressure reducing device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |