CN108923399A - A kind of recoverable constant current type surge restraint circuit - Google Patents
A kind of recoverable constant current type surge restraint circuit Download PDFInfo
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- CN108923399A CN108923399A CN201810707480.3A CN201810707480A CN108923399A CN 108923399 A CN108923399 A CN 108923399A CN 201810707480 A CN201810707480 A CN 201810707480A CN 108923399 A CN108923399 A CN 108923399A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The present invention provides a kind of recoverable constant current type surge restraint circuits, design the negative-feedback circuit of restricted electric current, surge current is limited in design value by the way of constant current.Do not need process debugging, also no matter how load characteristic changes, can surge current is accurately stable in design value, therefore have circuit it is simple, without debugging, reliability, it is highly-safe the advantages that.The Schottky diode that the present invention passes through a low pressure drops of more having connected on sampling circuit where metal-oxide-semiconductor base stage and radio pole, the negative temperature coefficient that pressure drop between transistor base and radio pole can be offset by the negative temperature coefficient of diode is held essentially constant surge cut-off current within the scope of larger temperature.
Description
Technical field
The present invention relates to integrated electronics on star and power technique fields, and in particular to a kind of recoverable constant current type wave
Suppression circuit is gushed, is mainly used in and in-orbit repairs aircraft.
Background technique
The electronic circuit that positive terminal Surge suppression is realized currently with the soft start of P-channel metal-oxide-semiconductor, by P-channel MOS
The composition such as pipe, resistance and capacitor.Fig. 1 is currently used P-channel metal-oxide-semiconductor surge restraint circuit schematic diagram.As input terminal mother
When line is powered on, the capacitor between metal-oxide-semiconductor gate pole and source electrode is started to charge, so that voltage slowly rises between metal-oxide-semiconductor gate pole and source electrode
Height, metal-oxide-semiconductor are voltage controlled current source, by voltage it is slowly varying come inhibit booting when surge current, thus reach wave
Gush the purpose of electric current inhibition；As capacitor charging voltage slowly increases, metal-oxide-semiconductor enters conducting area by linear zone, and circuit is normally led
Logical work.
In practical P-channel metal-oxide-semiconductor circuit, the size of capacitive load is generally uncertain, therefore needs root in most cases
According to actual loading, the size of the capacitor or charging resistor between metal-oxide-semiconductor door source is debugged to determine parameter and fall weldering, the process is more numerous
It is trivial, do not know how much suitable capacitance-resistance parameter is, and there is also security risks for the first time when due to debugging.And load characteristic occurs
After variation, surge current can also change, it is possible to exceeded and influence circuit safety.Therefore, it is badly in need of a kind of for P-channel
Metal-oxide-semiconductor, without debugging, no longer because surge current is exceeded and worried and surge current does not change with load characteristic and changes
Surge restraint circuit.
Summary of the invention
In view of this, there is surge electricity the present invention provides a kind of recoverable constant current type surge restraint circuit
When stream, which can be constant on the current value of design electric current, and after surge, electric current restores normal.Without debugging, no longer because
Exceeded and worried for surge current, surge current does not change with load characteristic and is changed.
A kind of recoverable constant current type surge restraint circuit of the invention, including triode V1, metal-oxide-semiconductor V3, resistance
R1, resistance R2, resistance R3 and resistance R6；
Wherein the emitter of the triode V1 connects the input terminal of circuit, and collector is grounded by resistance R2, and base stage meets MOS
The source electrode of pipe V3；The gate pole of metal-oxide-semiconductor V3 connects the collector of triode V1 through resistance R6, and the drain electrode of metal-oxide-semiconductor V3 connects the output of circuit
End；The both ends of resistance R3 connect the emitter and base stage of triode V1 respectively；The both ends of resistance R1 connect respectively the source electrode of metal-oxide-semiconductor V3 with
And the collector of triode V1.
Preferably, a kind of recoverable constant current type surge restraint circuit of the invention further includes diode V8 and electricity
Hinder R5；Wherein, the anode of diode V8 connects the source electrode of metal-oxide-semiconductor V3, and cathode connects the base stage of triode V1 and is grounded by resistance R5.
Wherein, the diode V8 is Schottky diode.
Beneficial effect：
1. the negative-feedback circuit of restricted electric current is designed in recoverable constant current type surge restraint circuit of the invention,
Surge current is limited in design value by the way of constant current.Circuit wave is determined particular by current sampling resistor
Gushing cut-off current, when surge current is more than the current value of setting, current sampling resistor powers on that buckling is big, and current-limiting circuit is started to work,
The door source voltage of power MOS pipe is controlled, the electric current for flowing through metal-oxide-semiconductor is reduced, the electric current on sampling resistor becomes smaller, to be formed negative
Feedback, keeps surge current constant in setting value, and after surge, circuit is worked normally, and current-limiting circuit does not work, power switch
Pipe normally.Process debugging is not needed, also no matter how load characteristic changes, and can set surge current is accurately stable
On evaluation, thus have circuit it is simple, without debugging, reliability, it is highly-safe the advantages that.
2. the present invention passes through the Xiao Te for a low pressure drops of more having connected on sampling circuit where metal-oxide-semiconductor base stage and radio pole
Based diode can offset the negative temperature coefficient of pressure drop between transistor base and radio pole by the negative temperature coefficient of diode,
It is held essentially constant surge cut-off current within the scope of larger temperature.And due to the effect of series diode, reduce wave
The pressure drop on suppression circuit bus is gushed, the heat consumption of sampling resistor is reduced.
Detailed description of the invention
Fig. 1 is existing P-channel metal-oxide-semiconductor soft start surge restraint circuit schematic diagram.
Fig. 2 is the recoverable constant current type surge restraint circuit schematic diagram of the present invention.
Fig. 3 is the recoverable constant current type surge restraint circuit schematic diagram that the present invention has diode.
Specific embodiment
The present invention will now be described in detail with reference to the accompanying drawings and examples.
For the surge restraint circuit in the present invention, the definition of leading point label is：Vin is the circuit busbar input terminal,
Vout is the circuit busbar output end, and GND is power return, and the metal-oxide-semiconductor is P-channel metal-oxide-semiconductor.
Embodiment 1：The circuit of the present embodiment includes triode V1, metal-oxide-semiconductor V3, resistance R1, resistance R2, resistance R3 and electricity
Hinder R6；
Wherein the emitter of the triode V1 connects the input terminal of circuit, and collector is grounded by resistance R2, and base stage meets MOS
The source electrode of pipe V3；The gate pole of metal-oxide-semiconductor V3 connects the collector of triode V1 through resistance R6, and the drain electrode of metal-oxide-semiconductor V3 connects the output of circuit
End；The both ends of resistance R3 connect the emitter and base stage of triode V1 respectively；The both ends of resistance R1 connect respectively the source electrode of metal-oxide-semiconductor V3 with
And the collector of triode V1.
Circuit surge cut-off current IL=Ube/Rs=0.6V/Rs (1)
Wherein, IL indicates that constant current value, Ube indicate that conducting voltage 0.6V, Rs between the base emitter-base bandgap grading of triode V1 indicate sampling
The resistance value of resistance R3.Therefore cut-off current is mainly determined by the resistance value of resistance R3.
The principle of the constant surge current function of the surge restraint circuit of the present embodiment is to utilize the electricity on sampling resistor R3
Pressure and the relationship of the BE junction voltage of triode V1 achieve the purpose that constant surge current.When the voltage flowed through on sampling resistor R3 reaches
To V1 BE junction voltage when, V1 enters amplification region, so that voltage between V3 sources of metal-oxide-semiconductor be made to become smaller, force its work in linear zone,
The electric current for flowing through metal-oxide-semiconductor is reduced in linear zone biggish conducting resistance Ron using metal-oxide-semiconductor work, after electric current becomes smaller, is then sampled
Voltage on resistance R3 becomes smaller, to form a negative-feedback, keeps electric current constant on a particular value, reaches constant surge electricity
The purpose of stream.
When limiting identical Surge suppression electric current, pressure drop maximum on the circuit busbar is up to 0.6V, on sampling resistor R3
Corresponding heat consumption is also big, and since the BE that Ube is triode V1 in formula 1 ties conduction voltage drop, similar with diode characteristic, when
At 1 DEG C of temperature change, triode Ube about changes 2~2.5mV, has negative temperature coefficient, i.e., temperature is every increases 1 DEG C, triode
Ube about declines 2~2.5mV.Therefore, according to cut-off current formula 1, surge cut-off current can also vary with temperature and change, and work as temperature
When spending wider range, cut-off current variation range can also become larger accordingly.
Embodiment 2：
The circuit of the present embodiment is as shown in figure 3, further include diode V8 and resistance R5 on the basis of embodiment 1；Its
In, the anode of diode V8 connects the source electrode of metal-oxide-semiconductor V3, and cathode connects the base stage of triode V1 and is grounded by resistance R5.
The principle of the constant surge current function of the surge restraint circuit of the present embodiment is same as Example 1, with embodiment 1
It compares, the present embodiment is in the Schottky two of a low pressure drops of more having connected on sampling circuit where metal-oxide-semiconductor base stage and radio pole
Pole pipe V8, the negative temperature coefficient of this diode can offset the negative temperature coefficient of triode Ube, make surge cut-off current in biggish temperature
It is held essentially constant in degree range.And due to the effect of series diode V8, reduce the pressure on surge restraint circuit bus
Drop, by original 0.6V (Ube), becomes 0.4V, Ube-Ud=0.6-0.2=0.4V, reduces the heat consumption of sampling resistor R3.
The calculation formula of the surge current limits value of the present embodiment such as formula 2:
IL=(Ube-Ud)/Rs (2)
Wherein IL indicates that constant current value, Ube indicate that conducting voltage 0.6V, Ud between the base emitter-base bandgap grading of V1 indicate the conducting voltage of V2
(being less than 0.6V, generally selection Schottky diode, the present embodiment select the diode of model 1N5819, pressure drop 0.2V),
The resistance value of Rs expression sampling resistor R3.
Therefore cut-off current is mainly determined by the resistance value of resistance R3, IL=(0.6V-0.2V)/Rs=0.4/Rs, when taking
When Rs is 0.3 Ω, surge cut-off current is 1.3A.
Table 1 is the reality that the present embodiment circuit (Fig. 3) and diode improve preceding circuit (Fig. 2) surge cut-off current and temperature relation
Survey result.
Table 1
| Temperature (DEG C) | Fig. 2 circuit cut-off current (A) | Variable quantity (%) | Fig. 3 circuit cut-off current (A) | Variable quantity (%) |
| -55 | 1.51 | +24.79 | 1.20 | +3.45 |
| -45 | 1.49 | +23.14 | 1.20 | +3.45 |
| -35 | 1.43 | +18.18 | 1.18 | +1.72 |
| -25 | 1.38 | +14.05 | 1.18 | +1.72 |
| -15 | 1.33 | +9.92 | 1.18 | +1.72 |
| -5 | 1.31 | +8.26 | 1.18 | +1.72 |
| 5 | 1.25 | +3.31 | 1.16 | 0 |
| 15 | 1.23 | +1.65 | 1.16 | 0 |
| 25 | 1.21 | 0 | 1.16 | 0 |
| 35 | 1.17 | -3.31 | 1.14 | -1.72 |
| 45 | 1.11 | -8.26 | 1.14 | -1.72 |
| 55 | 1.08 | -10.74 | 1.12 | -3.45 |
| 65 | 1.03 | -14.88 | 1.10 | -5.17 |
| 75 | 1.01 | -16.53 | 1.10 | -5.17 |
| 85 | 0.95 | -21.49 | 1.08 | -6.90 |
It is functional in the present embodiment circuit actual application from the point of view of measured result, and have been subjected to in-orbit flight
Verifying, works well.
In conclusion the above is merely preferred embodiments of the present invention, being not intended to limit the scope of the present invention.
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention
Within protection scope.
Claims (3)
1. a kind of recoverable constant current type surge restraint circuit, which is characterized in that including triode V1, metal-oxide-semiconductor V3, resistance
R1, resistance R2, resistance R3 and resistance R6；
Wherein the emitter of the triode V1 connects the input terminal of circuit, and collector is grounded by resistance R2, and base stage meets metal-oxide-semiconductor V3
Source electrode；The gate pole of metal-oxide-semiconductor V3 connects the collector of triode V1 through resistance R6, and the drain electrode of metal-oxide-semiconductor V3 connects the output end of circuit；Electricity
The both ends of resistance R3 connect the emitter and base stage of triode V1 respectively；The both ends of resistance R1 connect the source electrode and three of metal-oxide-semiconductor V3 respectively
The collector of pole pipe V1.
2. a kind of recoverable constant current type surge restraint circuit as described in claim 1, which is characterized in that further include two
Pole pipe V8 and resistance R5；Wherein, the anode of diode V8 connects the source electrode of metal-oxide-semiconductor V3, and cathode connects the base stage of triode V1 and leads to
Cross resistance R5 ground connection.
3. a kind of recoverable constant current type surge restraint circuit as claimed in claim 2, which is characterized in that two pole
Pipe V8 is Schottky diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810707480.3A CN108923399A (en) | 2018-07-02 | 2018-07-02 | A kind of recoverable constant current type surge restraint circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810707480.3A CN108923399A (en) | 2018-07-02 | 2018-07-02 | A kind of recoverable constant current type surge restraint circuit |
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| CN108923399A true CN108923399A (en) | 2018-11-30 |
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| CN201810707480.3A Pending CN108923399A (en) | 2018-07-02 | 2018-07-02 | A kind of recoverable constant current type surge restraint circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114006362A (en) * | 2021-11-12 | 2022-02-01 | 中国电子科技集团公司第二十九研究所 | Input surge current suppression circuit and method of capacitor |
Citations (8)
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|---|---|---|---|---|
| US5892665A (en) * | 1997-08-25 | 1999-04-06 | Murata Manufacturing Co., Ltd. | Overcurrent protection circuit |
| JP2000340669A (en) * | 1999-05-26 | 2000-12-08 | Nissan Motor Co Ltd | Active clamping circuit |
| CN201654120U (en) * | 2010-04-29 | 2010-11-24 | 深圳市英唐电气技术有限公司 | Power output detection circuit and power control circuit |
| CN102437560A (en) * | 2011-12-20 | 2012-05-02 | 北京控制工程研究所 | Surge current suppression circuit module with recoverable over-current protection function |
| CN203859489U (en) * | 2014-05-28 | 2014-10-01 | 安徽中电电气有限公司 | Current limiting protection circuit |
| CN205283394U (en) * | 2015-11-05 | 2016-06-01 | 北京动力源科技股份有限公司 | Output voltage adjustable linear stabilizer circuit and have power of this circuit |
| CN205647249U (en) * | 2016-03-15 | 2016-10-12 | 深圳市共进电子股份有限公司 | Overvoltage crowbar and switching power supply circuit |
| CN206524614U (en) * | 2017-03-16 | 2017-09-26 | 四川久远智能监控有限责任公司 | A kind of current-limiting protection controls circuit |
-
2018
- 2018-07-02 CN CN201810707480.3A patent/CN108923399A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5892665A (en) * | 1997-08-25 | 1999-04-06 | Murata Manufacturing Co., Ltd. | Overcurrent protection circuit |
| JP2000340669A (en) * | 1999-05-26 | 2000-12-08 | Nissan Motor Co Ltd | Active clamping circuit |
| CN201654120U (en) * | 2010-04-29 | 2010-11-24 | 深圳市英唐电气技术有限公司 | Power output detection circuit and power control circuit |
| CN102437560A (en) * | 2011-12-20 | 2012-05-02 | 北京控制工程研究所 | Surge current suppression circuit module with recoverable over-current protection function |
| CN203859489U (en) * | 2014-05-28 | 2014-10-01 | 安徽中电电气有限公司 | Current limiting protection circuit |
| CN205283394U (en) * | 2015-11-05 | 2016-06-01 | 北京动力源科技股份有限公司 | Output voltage adjustable linear stabilizer circuit and have power of this circuit |
| CN205647249U (en) * | 2016-03-15 | 2016-10-12 | 深圳市共进电子股份有限公司 | Overvoltage crowbar and switching power supply circuit |
| CN206524614U (en) * | 2017-03-16 | 2017-09-26 | 四川久远智能监控有限责任公司 | A kind of current-limiting protection controls circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114006362A (en) * | 2021-11-12 | 2022-02-01 | 中国电子科技集团公司第二十九研究所 | Input surge current suppression circuit and method of capacitor |
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Application publication date: 20181130 |