CN206742852U - A kind of surge restraint circuit - Google Patents
A kind of surge restraint circuit Download PDFInfo
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- CN206742852U CN206742852U CN201720493954.XU CN201720493954U CN206742852U CN 206742852 U CN206742852 U CN 206742852U CN 201720493954 U CN201720493954 U CN 201720493954U CN 206742852 U CN206742852 U CN 206742852U
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Abstract
The utility model provides a kind of surge restraint circuit, including surge restraining unit, electronic switch K, sustained diode, current detection circuit and comparator；The surge restraining unit is Surge suppression inductance L；Electronic switch K and Surge suppression the inductance L is sequentially connected in series on the major loop being connected between power supply and user load；The negative pole of the sustained diode is connected on the major loop between electronic switch K and Surge suppression the inductance L, the plus earth of sustained diode；The sampling of the current detection circuit is terminated on the major loop between the sustained diode and user load, one of input of the output termination comparator of current detection circuit；Another input termination reference voltage of the comparator, the output signal of comparator control the break-make of the electronic switch K.Surge impact electric current can accurately be determined, do not influenceed by variation of ambient temperature, oneself power consumption is small, be resistant to long-time inrush current shock for the utility model suppression.
Description
Technical field
The utility model belongs to electric and electronic technical field, is related to a kind of surge restraint circuit.
Background technology
Many test equipments are when testing test object, it is necessary to be powered to measured piece.Due to the power supply of measured piece
End when the power is turned on, can produce very big surge impact electric current, lead often added with very big electric capacity (＞ 10000uF)
Power supply moment is caused to enter overcurrent protection state, supply voltage declines, causes test equipment power down, reset, restart.Not only make
It is inconvenient for use into user, also reduce the confidence level and reliability of test equipment.
In order to reduce surge impact electric current, traditional method is that NTC resistance R are sealed in current supply circuit, as shown in figure 1,
When NTC resistance R is in cold conditions, resistance is larger, and surge current can be suppressed in booting moment, in normal work, due to
There is electric current to flow through in NTC resistance R, resistive element heating, resistance diminishes, and power supply is to electrical equipment normal power supply.
Problems be present in this circuit：
1st, the presence of resistance adds extra power consumption, and system reliability reduces
Because NTC resistance can not possibly be infinitely small, thus certain power can be still consumed in electrical equipment normal work, tieed up
Hold NTC resistance R temperature.Not only cause the waste of the energy, and due to NTC resistance R when higher temperature works compared with rapid wear
It is bad, make the reliability of system reduce.
2nd, it is not suitable for the dash current of long period
When load end input capacitance is especially big, because within a certain period of time, NTC resistance R resistance has reduced, can not be right
Lasting surge impact electric current is suppressed, and causes surge impact suppression circuit to fail, and influences the reliability of system.
3rd, frequent machine open/close circuit was not suitable in the short time
Due to NTC resistance R thermal inertia, when test system needs frequent ON/OFF measured piece power supply circuit, due to NTC
Resistance R resistance is not recovered, does not have Inrush current restraining effect, can not ensure system safety.
4th, accurate Inrush current restraining value can not be determined
Process deviation when being manufactured due to NTC resistance R resistance and the correlation of temperature and NTC resistance R so that in surge
Suppression circuit designs and can not determine rational Inrush current restraining value when debugging, and is specifically verified when can only pass through debugging, comes true
Determine NTC resistance R approximate range.And when environment temperature wide variation, this circuit can not meet to require at all.
Utility model content
To solve problem present in above-mentioned background technology, the utility model provides a kind of suppression surge impact electric current energy
The accurate surge restraint circuit for determining, not influenceed by variation of ambient temperature, while have that oneself power consumption is small, is resistant to wave for a long time
Gush rush of current, in a short time can frequent machine open/close the characteristics of.
The technical solution of the utility model is：
A kind of surge restraint circuit, including surge restraining unit and electronic switch K；It is characterized in that：
Also include sustained diode, current detection circuit and comparator；
The surge restraining unit is Surge suppression inductance L；
Electronic switch K and Surge suppression the inductance L is sequentially connected in series the master being connected between power supply and user load and returned
Lu Shang；
The negative pole of the sustained diode is connected on the major loop between electronic switch K and Surge suppression the inductance L,
The plus earth of sustained diode；
The sampling of the current detection circuit is terminated on the major loop between the sustained diode and user load,
One of input of the output termination comparator of current detection circuit；
Another input termination reference voltage of the comparator, the output signal of comparator control the electronic switch K
Break-make.
Further, above-mentioned surge restraint circuit also includes the control being arranged between the electronic switch K and comparator
Circuit；One input of the control circuit terminates the output end of the comparator, and another input termination of control circuit is used
In the switch S for providing starting-up signal, the output of control circuit terminates the control terminal of the electronic switch K.
Further, above-mentioned current detection circuit is difference channel, including detection resistance R and amplifier；The detection electricity
R series connections are hindered on the major loop between power supply and Surge suppression inductance L, and are located at sustained diode and Surge suppression
Between inductance L；Two inputs of the amplifier connect detection resistance R both ends respectively, and output terminates its of the comparator
In an input.
Further, above-mentioned detection resistance R uses Milliohm resistance.
Further, above-mentioned comparator uses window comparator；Above-mentioned electronic switch K uses high speed electronic switch, can be
Perseveration under high frequency state, its switching frequency are several KHz to hundreds of KHz.
Further, above-mentioned sustained diode uses fast recovery diode.
The utility model provides a kind of method suppressed using above-mentioned surge restraint circuit to surge simultaneously, and it is special
Different part is, comprises the following steps：
1) electronic switch K is turned on；
2) collection main circuit current is converted into voltage signal and amplified；
3) voltage signal and reference voltage set in advance obtained step 2) is compared：If being less than reference voltage,
Then electronic switch K is tended to remain on；If being more than or equal to reference voltage, step 4) is performed；The reference voltage is with being limited
Major loop surge impact current value it is linear；
4) electronic switch K is disconnected, from sustained diode to Surge suppression inductance L afterflows, under main circuit current starts
Drop；
5) when main circuit current drops to the lower limit of comparator, electronic switch K is turned on again, and main circuit current is opened again
Begin to rise；
6) repeat step 2) -5), main circuit current is remained in claimed range.
Further, to realize the start soft start of suppression circuit, above-mentioned steps 1) -6) in be related to electronic switch K
Break-make control be to be realized by control circuit and comparator co- controlling；Described in one input termination of the control circuit
The over-current signal of comparator output, the starting-up signal of another input termination starting-up signal switch S offer of control circuit, control
The output of circuit terminates the control terminal of the electronic switch K.
Further, above-mentioned steps 2) it is to be realized by current detection circuit；The current detection circuit is differential electrical
Road, including detection resistance R and amplifier；The detection resistance R series connections are in the sustained diode and Surge suppression inductance L
Between major loop on；Two inputs of the amplifier connect detection resistance R both ends respectively, and output terminates the comparator
Reverse input end；Detection resistance R is Milliohm resistance.
Further, above-mentioned comparator uses window comparator；Electronic switch K uses high speed electronic switch, can be in high frequency
Perseveration under state, its switching frequency are several KHz to hundreds of KHz；Sustained diode uses fast recovery diode.
Compared with prior art, the beneficial effects of the utility model are：
1st, the utility model has abandoned the circuit and method that Surge suppression is traditionally carried out using NTC resistance, utilizes inductance
The characteristics of electric current can not be mutated, using Surge suppression inductance and the ingenious cooperation of current detection circuit, constant-current circuit is formed, for load
The large bulk capacitance charging at end, restrained effectively start surge impact electric current.
2nd, compared with the technology that traditional NTC resistance carries out Surge suppression, surge current setting of the present utility model is simple,
Clearly, and entirely in circuit without temperature-sensing element (device), do not influenceed by ambient temperature, particularly suitable for power-limited to big
The occasion of capacity load supplying.
3rd, the utility model makes current detection circuit simple, easy, only with a milliohm level electricity by introducing difference channel
Resistance achieves that current detecting, and Surge suppression inductance is lossless element, therefore compared with traditional NTC surge restraint circuits,
Oneself power consumption is very small.
4th, the utility model has sealed in Surge suppression inductance in main circuit power supply prevents main circuit power supply electric current from being mutated,
Current maxima can only achieve current limliting setting value, thus be resistant to long-time inrush current shock.
5th, due in suppression circuit of the present utility model without thermal inertia element, therefore in a short time can frequent machine open/close.
6th, the utility model makes electronic switch be operated in high-frequency impulse state during surge impact by introducing comparator
Under, so as to substantially reduce the volume of Surge suppression inductance, be advantageous to the miniaturization of whole circuit.
Brief description of the drawings
Fig. 1 is the schematic diagram of traditional surge restraint circuit；
Fig. 2 is the schematic diagram of surge restraint circuit of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
As shown in Fig. 2 surge restraint circuit provided by the utility model is mainly by Surge suppression inductance L, the pole of afterflow two
Pipe D, current detection circuit, comparator and electronic switch K compositions.The enabling logic of electronic switch is that low level has in this example
Effect.
Electronic switch K and Surge suppression inductance L are sequentially connected in series on the major loop being connected between power supply and user load；
When electronic switch K is closed, power supply is powered to user load, due to the characteristics of can not being mutated by inductive current, is forced
Dash current slowly rises,
The negative pole of sustained diode is connected on the main circuit power supply between electronic switch K and Surge suppression inductance L, afterflow
Diode D plus earth, when electronic switch K disconnects, sustained diode provides for the afterflow of Surge suppression inductance L electric currents
Loop, to prevent the electronic switch K shut-off influences of caused surge voltage to measured piece on Surge suppression inductance L suddenly；
The input of current detection circuit is terminated on the major loop between sustained diode and Surge suppression inductance L, can also be connected on wave
Gush on the major loop between suppression inductance L and user load, the reverse input of the output termination comparator of current detection circuit
End；The input in the same direction termination reference voltage of comparator, the output termination electronic switch K of comparator.
Current detection circuit can build difference amplifier to realize using general discharge circuit, can also select special
Current detection circuit is such as：INA139, INA301 etc. are realized.To make current detection circuit simply, easily realize that the utility model is adopted
By the use of difference channel as current detection circuit, including detection resistance R and amplifier, wherein, detection resistance R series connections are in afterflow two
On major loop between pole pipe D and Surge suppression inductance L, two inputs of amplifier connect detection resistance R both ends respectively, defeated
Go out to terminate the reverse input end of comparator.As long as detection resistance R milliohms level here just can realize current detecting, therefore itself work(
Very little is consumed, can the effectively save energy.
General comparator chip, such as LM319 can be selected in comparator.If not high to switch frequency requirement, can also select
General operational amplifier chip, such as LM324, OP07.For make electronic switch K during surge impact can under high-frequency impulse state normal work
Make, while make whole circuit miniaturization, comparator of the present utility model uses window comparator.
To meet frequent machine open/close requirement in the short time, electronic switch K of the present utility model uses high speed electronic switch K,
Can be in perseveration under high frequency state, its switching frequency is several KHz to hundreds of KHz.
Because the switching frequency of the utility model circuit is higher, therefore, fly-wheel diode uses fast recovery diode.
To realize the start soft start of suppression circuit, the utility model is provided between electronic switch K and comparator
Control the control circuit of electronic switch K open and-shut modes；The excessively stream letter that one input termination comparator of the control circuit is exported
Number, the starting-up signal that another input of the control circuit is inputted by switching S accessing users, the output end of the control circuit
Connect electronic switch K control terminal.
Surge restraint circuit provided by the utility model is the Function Extension of user load power switch, and without this reality
In the case of new, connection of the starting-up signal by switching S of user's input directly controls electronic switch K to turn on, and user bears
Carry electric, now will be in booting moment with larger dash current.And after adding the utility model circuit, the utility model
The on/off of circuit and the starting-up signal co- controlling electronic switch K of user's input, when switching S disconnections, the utility model circuit
It is invalid；When switching S connections, electronic switch K on/off is started shooting by the over-current signal and user's input that window comparator exports
After signal co- controlling, over-current signal and starting-up signal are by the OR circuit processing in control circuit, obtain being used to control electricity
The control signal of sub switch K on/off.
Illustrate operation principle and process of the present utility model referring herein to specific embodiment shown in Fig. 2：
1) current limit by inductance：
The characteristics of can not being mutated using the electric current by Surge suppression inductance L, dash current is forced slowly to rise；Profit
With the sustained diode supporting with Surge suppression inductance L, the afterflow for Surge suppression inductance L electric currents provides loop, it is therefore prevented that
The electronic switch K shut-off influences of caused surge voltage to measured piece on inductance suddenly.
2) current sample is compared with：
Utilize electric current (the i.e. output of power supply of the current detection circuit to Surge suppression inductance L front-end power major loops
Electric current) sampled, sampled value and surge impact current value set in advance are compared：
If sampled value is less than surge impact current setting value, (i.e. the magnitude of voltage of current detection circuit output is less than benchmark electricity
Pressure), then comparator is not overturn, and electronic switch K keeps normally state, now due to Surge suppression inductance L presence, power supply
The output current of power supply rises.
Once sampled value is more than or equal to the surge impact current value set, (i.e. the magnitude of voltage of current detection circuit output is big
In or equal to reference voltage), comparator upset, electronic switch K disconnects, and now the output current slope of power supply declines.
When the output current of suppression circuit drops to the lower limit of comparator, comparator returns, and electronic switch K is again
Conducting, continue to power to load end bulky capacitor, so as to form a string of switching pulses, it is that bulky capacitor fills to be equivalent to continuous current
Electricity, as long as the output current of power supply is less than the surge impact current value of setting, electronic switch K is maintained for conducting state.When
After load end bulky capacitor charging complete, electronic switch K still in and tend to remain on, due to Surge suppression inductance L direct current
Resistance is very small, can be ignored, and now surge restraint circuit exits surge suppression status, and power supply is to load bulky capacitor
Stable power-supplying.
Claims (6)
1. a kind of surge restraint circuit, including surge restraining unit and electronic switch K；It is characterized in that：
Also include sustained diode, current detection circuit and comparator；
The surge restraining unit is Surge suppression inductance L；
Electronic switch K and Surge suppression the inductance L is sequentially connected in series on the major loop being connected between power supply and user load；
The negative pole of the sustained diode is connected on the major loop between electronic switch K and Surge suppression the inductance L, afterflow
Diode D plus earth；
The sampling of the current detection circuit is terminated on the major loop between the sustained diode and user load, electric current
Detect one of input of the output termination comparator of circuit；
Another input termination reference voltage of the comparator, the output signal of comparator control leading to for the electronic switch K
It is disconnected.
A kind of 2. surge restraint circuit according to claim 1, it is characterised in that：Also include being arranged on the electronic switch
Control circuit between K and comparator；One input of the control circuit terminates the over-current signal of the comparator output, control
The starting-up signal that another input termination switch S of circuit processed is provided, the output of control circuit terminate the control of the electronic switch K
End processed.
A kind of 3. surge restraint circuit according to claim 1 or 2, it is characterised in that：The current detection circuit is poor
Parallel circuit, including detection resistance R and amplifier；The detection resistance R series connections are between power supply and Surge suppression inductance L
Major loop on, and between sustained diode and Surge suppression inductance L；Two inputs of the amplifier connect respectively
Detection resistance R both ends, output terminate one of input of the comparator.
A kind of 4. surge restraint circuit according to claim 1 or 2, it is characterised in that：The detection resistance R is milliohm level
Resistance.
A kind of 5. surge restraint circuit according to claim 1 or 2, it is characterised in that：The comparator compares for window
Device；The electronic switch K is high speed electronic switch, can be in perseveration under high frequency state, and its switching frequency is several KHz to hundreds of
KHz。
A kind of 6. surge restraint circuit according to claim 1 or 2, it is characterised in that：The sustained diode is fast extensive
Multiple diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720493954.XU CN206742852U (en) | 2017-05-05 | 2017-05-05 | A kind of surge restraint circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720493954.XU CN206742852U (en) | 2017-05-05 | 2017-05-05 | A kind of surge restraint circuit |
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| Publication Number | Publication Date |
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| CN206742852U true CN206742852U (en) | 2017-12-12 |
Family
ID=60563854
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720493954.XU Active CN206742852U (en) | 2017-05-05 | 2017-05-05 | A kind of surge restraint circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107069688A (en) * | 2017-05-05 | 2017-08-18 | 西安太世德航空电器有限公司 | A kind of surge restraint circuit and Surge suppression method |
| CN111435785A (en) * | 2019-01-12 | 2020-07-21 | 上海航空电器有限公司 | Electrical surge current suppression circuit structure and method for airborne equipment |
| CN111525497A (en) * | 2020-05-26 | 2020-08-11 | 广东博智林机器人有限公司 | Buffer circuit and electronic equipment |
| TWI762133B (en) * | 2020-12-30 | 2022-04-21 | 致茂電子股份有限公司 | Inrush current suppression circuit |
-
2017
- 2017-05-05 CN CN201720493954.XU patent/CN206742852U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107069688A (en) * | 2017-05-05 | 2017-08-18 | 西安太世德航空电器有限公司 | A kind of surge restraint circuit and Surge suppression method |
| CN111435785A (en) * | 2019-01-12 | 2020-07-21 | 上海航空电器有限公司 | Electrical surge current suppression circuit structure and method for airborne equipment |
| CN111435785B (en) * | 2019-01-12 | 2023-08-08 | 上海航空电器有限公司 | Circuit structure and method for suppressing power-on surge current of airborne equipment |
| CN111525497A (en) * | 2020-05-26 | 2020-08-11 | 广东博智林机器人有限公司 | Buffer circuit and electronic equipment |
| CN111525497B (en) * | 2020-05-26 | 2022-06-24 | 广东博智林机器人有限公司 | Buffer circuit and electronic equipment |
| TWI762133B (en) * | 2020-12-30 | 2022-04-21 | 致茂電子股份有限公司 | Inrush current suppression circuit |
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