CN110212488A - A kind of simple direct current anti-overvoltage circuit - Google Patents
A kind of simple direct current anti-overvoltage circuit Download PDFInfo
- Publication number
- CN110212488A CN110212488A CN201910571359.7A CN201910571359A CN110212488A CN 110212488 A CN110212488 A CN 110212488A CN 201910571359 A CN201910571359 A CN 201910571359A CN 110212488 A CN110212488 A CN 110212488A
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- triode
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- 239000003990 capacitor Substances 0.000 claims abstract description 16
- 230000005611 electricity Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
- H02H3/202—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage for dc systems
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Abstract
A kind of simple direct current anti-overvoltage circuit, is related to control circuit field.Including input power Vin, resistance R1, resistance R3, capacitor C2, zener diode D1, triode Q2, PMOS tube Q1, PMOS tube Q1 has been correspondingly connected with switching signal control circuit；One end connection input power Vin, the other end of resistance R1 connect the negative pole end of zener diode D1, the positive terminal of zener diode D1 is grounded, the pole b of triode Q2 passes through the negative pole end of resistance R3 connection zener diode D1, the pole s of the pole the e connection PMOS tube of triode Q2, the pole g of the pole the c connection PMOS tube of triode Q2, the pole the d connection capacitor C2 of the d of PMOS tube Q1 extremely power output end Vout, PMOS tube Q1 are simultaneously grounded.The present invention has the characteristics that high durability, and the permanent damage of anti-overvoltage circuit will not be usually caused because of overpressure problems and can protect front stage circuits to a certain extent.
Description
Technical field
The present invention relates to control circuit field, specially a kind of simple direct current anti-overvoltage circuit.
Background technique
In industrial control field, as the diversification of demand requires, system scale is also increasing.Multiple functional units need altogether
It is very universal with a power supply.Same power supply is in multi-load, when each load is again dynamic or when power supply itself is unstable, than
It is easier to cause power supply output pulsation excessive, such as without corresponding safeguard measure, it is likely that lead to equipment operation irregularity or damage.
Summary of the invention
The object of the present invention is to provide a kind of simple direct current anti-overvoltage circuit, which can be direct current, low in power supply
It is unstable because of power supply that equipment is avoided in the case where voltage, and leads to equipment operation irregularity or damage.
Realizing the technical solution of above-mentioned purpose is: a kind of simple anti-overvoltage circuit of direct current, it is characterised in that: including input electricity
Source Vin, resistance R1, resistance R3, capacitor C2, zener diode D1, triode Q2, PMOS tube Q1, PMOS tube Q1 are correspondingly connected with
There is switching signal control circuit；
One end connection input power Vin, the other end of the resistance R1 connect the negative pole end of zener diode D1, zener diode
The positive terminal of D1 is grounded, and the pole b of the triode Q2 passes through the negative pole end of resistance R3 connection zener diode D1, triode Q2's
The pole e connects the pole s of PMOS tube, the pole g of the pole the c connection PMOS tube of triode Q2, the d of PMOS tube Q1 extremely power output end
The pole d of Vout, PMOS tube Q1 are also connected with capacitor C2 and are grounded.
Beneficial effects of the present invention: the present invention has the characteristics that high durability, and anti-mistake will not be usually caused because of overpressure problems
The permanent damage of volt circuit and front stage circuits can be protected to a certain extent；And with TVS diode or the anti-over-voltage of voltage-stabiliser tube,
When the input power source abnormality over-voltage time is longer, it is easy to TVS diode or voltage-stabiliser tube be caused to burn out.
Further, the anti-overvoltage circuit further includes capacitor C1, capacitor C1 be connected in parallel on PMOS tube Q1 the pole s and the pole g it
Between.
The main function of capacitor C1 is to filter out the lesser interference of some pulsewidths, places PMOS tube Q1 malfunction.General ceramics
Lamination capacitor.
Further, the switching signal control circuit includes resistance R2, R4, triode Q3, the pole b of the triode Q3
One end of the power control signal source pole V0, e ground connection, the pole c connection resistance R4 is connected, the other end of resistance R4 is separately connected resistance R2
One end and PMOS tube the pole g, resistance R2 the other end connection PMOS tube the pole s.
When power control signal source V0 exports high level signal, triode Q3 is connected and powers on, when power supply controls
When signal source V0 exports low level signal, triode Q3 ends and cuts off the power.The effect of resistance R2, R4 are to guarantee PMOS tube
Voltage between the pole g and the pole s of Q1 meets the parameter request of PMOS tube Q1.
Further, the switching signal control circuit further includes resistance R5, the b of one end connecting triode Q3 of resistance R5
Pole, other end ground connection, the effect of resistance R5 is to prevent triode Q3 from misleading, and keeps the pole the b level of triode Q3 more stable.
Detailed description of the invention
Fig. 1 is circuit diagram of the invention.
Specific embodiment
As shown in Figure 1, the present invention includes including input power Vin, resistance R1, resistance R3, capacitor C1, C2, two pole of pressure stabilizing
Pipe D1, triode Q2, PMOS tube Q1.
One end connection input power Vin, the other end of resistance R1 connect the negative pole end of zener diode D1, zener diode
The positive terminal of D1 is grounded, and the pole b of triode Q2 passes through the negative pole end of resistance R3 connection zener diode D1, the pole e of triode Q2
The pole s of PMOS tube, the pole g of the pole the c connection PMOS tube of triode Q2 are connected, capacitor C1 is connected in parallel on the pole s and the pole g of PMOS tube Q1
Between, the d of PMOS tube Q1 extremely power output end Vout, the pole d of PMOS tube Q1 is also connected with capacitor C2 and is grounded, capacitor C2 be for
Not due to over-voltage, the stabilized power supply of short supply interruption available backup is substituted.
PMOS tube Q1 has been correspondingly connected with switching signal control circuit, and switching signal control circuit includes resistance R2, R4, electricity
Hinder R5, the pole the b connection power control signal source pole V0, e of triode Q3, the triode Q3 are grounded, the pole c connects the one of resistance R4
End, the pole b of one end connecting triode Q3 of resistance R5, other end ground connection, the other end of resistance R4 are separately connected the one of resistance R2
End and the pole g of PMOS tube, the pole s of the other end connection PMOS tube of resistance R2.
The working principle of the invention:
When Vin is fluctuated in the normal range, triode Q2 is in off state, and the on-off of PMOS tube Q1 is by power control signal
Source V0 is determined.
As Vin > Vmax, zener diode D1 conducting, there is electric current generation at the both ends resistance R1, makes the pole e and the b of triode Q2
Pressure difference is generated between pole, as Vbe_Q2 > Vbe (sat) _ Q2, Vgs (sat) _ Q1 is made to be close to 0, PMOS tube Q1 cut-off is protected
Late-class circuit avoids the influence of high pressure.
Wherein,
Vin: external power supply input
Vmax: the ceiling voltage that can be worked normally for guarantee late-class circuit.
Saturation voltage between Vbe (sat) _ Q2: triode the Q2 pole b and the pole e
Voltage between Vbe_Q2: triode the Q2 pole b and the pole E
Voltage when Vgs (sat) _ Q1:PMOS pipe Q1 is fully on, between the pole s and the pole g
The working principle of switching signal control circuit: when power control signal source V0 exports high level signal, triode Q3 is led
Lead to and power on, when power control signal source V0 exports low level signal, triode Q3 ends and cuts off the power.
Claims (4)
1. a kind of anti-overvoltage circuit of simple direct current, it is characterised in that: including input power Vin, resistance R1, resistance R3, capacitor C2,
Zener diode D1, triode Q2, PMOS tube Q1, PMOS tube Q1 have been correspondingly connected with switching signal control circuit；
One end connection input power Vin, the other end of the resistance R1 connect the negative pole end of zener diode D1, zener diode
The positive terminal of D1 is grounded, and the pole b of the triode Q2 passes through the negative pole end of resistance R3 connection zener diode D1, triode Q2's
The pole e connects the pole s of PMOS tube, the pole g of the pole the c connection PMOS tube of triode Q2, the d of PMOS tube Q1 extremely power output end
The pole d of Vout, PMOS tube Q1 are also connected with capacitor C2 and are grounded.
2. a kind of simple anti-overvoltage circuit of direct current according to claim 1, it is characterised in that: the anti-overvoltage circuit also wraps
Capacitor C1 is included, capacitor C1 is connected in parallel between the pole s of PMOS tube Q1 and the pole g.
3. a kind of simple anti-overvoltage circuit of direct current according to claim 1, it is characterised in that: the switching signal control electricity
Road includes resistance R2, R4, the pole the b connection power control signal source pole V0, e ground connection of triode Q3, the triode Q3, the pole c company
One end of connecting resistance R4, the other end of resistance R4 are separately connected one end of resistance R2 and the pole g of PMOS tube, and resistance R2's is another
The pole s of end connection PMOS tube.
4. a kind of simple direct current anti-overvoltage circuit according to claim 3, it is characterised in that: the switching signal control
Circuit further includes resistance R5, the pole b of one end connecting triode Q3 of resistance R5, other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910571359.7A CN110212488A (en) | 2019-06-28 | 2019-06-28 | A kind of simple direct current anti-overvoltage circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910571359.7A CN110212488A (en) | 2019-06-28 | 2019-06-28 | A kind of simple direct current anti-overvoltage circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110212488A true CN110212488A (en) | 2019-09-06 |
Family
ID=67795182
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910571359.7A Pending CN110212488A (en) | 2019-06-28 | 2019-06-28 | A kind of simple direct current anti-overvoltage circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110212488A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110474291A (en) * | 2019-09-20 | 2019-11-19 | 国网天津市电力公司 | A kind of distribution automation equipment power supply overvoltage protection device |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0879036A (en) * | 1994-08-31 | 1996-03-22 | Oki Electric Ind Co Ltd | Switch circuit |
| JPH09135158A (en) * | 1995-11-07 | 1997-05-20 | Toshiba Corp | P-cannel fet gate driving circuit |
| JP2000332587A (en) * | 1999-05-21 | 2000-11-30 | Matsushita Electric Ind Co Ltd | Switching circuit of p channel mosfet |
| WO2015172710A1 (en) * | 2014-05-13 | 2015-11-19 | 北京拓盛电子科技有限公司 | Explosion-proof circuit, charging circuit and charging/discharging protection circuit of battery |
| CN106786353A (en) * | 2016-12-13 | 2017-05-31 | 京信通信技术(广州)有限公司 | A kind of overvoltage crowbar |
| CN207884273U (en) * | 2017-09-22 | 2018-09-18 | 厦门亿联网络技术股份有限公司 | A kind of IP phone power supply protection circuit |
| CN208589916U (en) * | 2018-08-30 | 2019-03-08 | 宇能电气有限公司 | It is a kind of with overvoltage protection and it is anti-sparking function dc power interface circuit |
| CN208623316U (en) * | 2018-08-28 | 2019-03-19 | 华砺智行(武汉)科技有限公司 | A kind of concatenated vehicle-mounted anti-overvoltage circuit of voltage-stabiliser tube |
| CN208939567U (en) * | 2018-10-26 | 2019-06-04 | 深圳市睿德电子实业有限公司 | IC chip protection circuit against input over-voltage |
| CN210201467U (en) * | 2019-06-28 | 2020-03-27 | 上海鼎充新能源技术有限公司 | Simple direct-current overvoltage-preventing circuit |
-
2019
- 2019-06-28 CN CN201910571359.7A patent/CN110212488A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0879036A (en) * | 1994-08-31 | 1996-03-22 | Oki Electric Ind Co Ltd | Switch circuit |
| JPH09135158A (en) * | 1995-11-07 | 1997-05-20 | Toshiba Corp | P-cannel fet gate driving circuit |
| JP2000332587A (en) * | 1999-05-21 | 2000-11-30 | Matsushita Electric Ind Co Ltd | Switching circuit of p channel mosfet |
| WO2015172710A1 (en) * | 2014-05-13 | 2015-11-19 | 北京拓盛电子科技有限公司 | Explosion-proof circuit, charging circuit and charging/discharging protection circuit of battery |
| CN106786353A (en) * | 2016-12-13 | 2017-05-31 | 京信通信技术(广州)有限公司 | A kind of overvoltage crowbar |
| CN207884273U (en) * | 2017-09-22 | 2018-09-18 | 厦门亿联网络技术股份有限公司 | A kind of IP phone power supply protection circuit |
| CN208623316U (en) * | 2018-08-28 | 2019-03-19 | 华砺智行(武汉)科技有限公司 | A kind of concatenated vehicle-mounted anti-overvoltage circuit of voltage-stabiliser tube |
| CN208589916U (en) * | 2018-08-30 | 2019-03-08 | 宇能电气有限公司 | It is a kind of with overvoltage protection and it is anti-sparking function dc power interface circuit |
| CN208939567U (en) * | 2018-10-26 | 2019-06-04 | 深圳市睿德电子实业有限公司 | IC chip protection circuit against input over-voltage |
| CN210201467U (en) * | 2019-06-28 | 2020-03-27 | 上海鼎充新能源技术有限公司 | Simple direct-current overvoltage-preventing circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110474291A (en) * | 2019-09-20 | 2019-11-19 | 国网天津市电力公司 | A kind of distribution automation equipment power supply overvoltage protection device |
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