CN203326589U - Automatic-delay-type surge-current inhibitor - Google Patents
Automatic-delay-type surge-current inhibitor Download PDFInfo
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- CN203326589U CN203326589U CN2013203928200U CN201320392820U CN203326589U CN 203326589 U CN203326589 U CN 203326589U CN 2013203928200 U CN2013203928200 U CN 2013203928200U CN 201320392820 U CN201320392820 U CN 201320392820U CN 203326589 U CN203326589 U CN 203326589U
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Abstract
The utility model relates to an automatic-delay-type surge-current inhibitor including a voltage detection circuit, a logic control circuit, an auxiliary power circuit and an electronic switch. The surge-current inhibitor is characterized in that one end of the voltage detection circuit is connected with a master circuit and the other end is connected with the logic control circuit. The logic control circuit is connected with an electronic-switch circuit and at the same time the logic control circuit outputs a control signal in an isolative way and is connected with the remote-control end of a main-power circuit. An auxiliary power supply provides a power supply for a whole circuit. The voltage detection circuit monitors the input end of a mater input circuit in a real-time manner and provides a corresponding triggering signal to the logic control circuit according to a corresponding state of an input voltage so that automatic relay is realized. Then the logic control circuit generates a corresponding drive signal to control the on-off of the electronic switch and at the same time the logic control circuit also drives the on-off of an optoelectronic coupler after the automatic relay so that the main-power circuit is switched on or switched off at a corresponding moment.
Description
Technical field
The utility model relates to autonomous delayed type Inrush current restraining device, specifically, relates to a kind of device for the surge current produced in when charging that suppresses capacitive load.
Background technology
In a lot of application scenarios, all need the AC220V of civil power or AC380V are carried out to rectification and filtering, and filter circuit often adopts, be aluminium electrolytic capacitor.When starting, the initial voltage value of capacitor is zero, and the magnitude of voltage after rectification is often very high, will produce so a very large charging current to capacitor.When there is no surge current suppression circuit, due to this charge circuit internal resistance be very little, so will produce very large impulse current in this loop, maximum can reach nearly hundred peaces doubly.Large like this electric current not only can produce certain perturbation action to electrical network, also can produce heavy current impact to the device of rectification filtering circuit simultaneously, can cause the components and parts overcurrent stress in loop and produces early failure.Such as the switch contact in loop damages, rectifier diode reduces useful life, early failure of capacitor etc.To damage or damage in order reducing on sort circuit, at rectification circuit and capacitor filtering circuit, to have added the Inrush current restraining device.Method has two kinds, and a kind of is the thermistor that seals in a negative temperature coefficient in loop.This method cost is low and circuit is simple, but, because thermistor is gone here and there in loop always, has certain power loss, so can only be for low-power circuit.Have thermal inertia with advancing thermistor, i.e. cooling needs the time, so can not be for the circuit of frequent starting requirement is arranged.When another method is startup, adopt Power Resistor to be charged to capacitor, and then adopt a switch by the power resistor short circuit.The utility model also belongs to this type.Such surge suppressor can not lose efficiency, to not requiring that interval is oversize the interval time started yet.But traditional surge suppressor, have two three problems, first: in the loaded situation of rectified wave filter circuit band, capacitor is charged, when the shorting switch closure of resistor, voltage on capacitor reaches peak, so, when the resistor shorting switch is closed, can produce secondary pulse.Second: non-autonomous type time delay, the shorting switch that is resistor feeds back to obtain electric closure by output, when multichannel output is arranged, feedback loop by short circuit constantly, the resistor short switch disconnects, and also normal output of other road output, the input current that power stage produces so all will pass through the surge current-limiting resistance, can cause like this damage of this current-limiting resistor.The 3rd: non-autonomous type time delay, time interval of startup of input is also had to certain requirement, at interval, relatively in the short time, again start, also may produce larger inrush current.
The utility model content
For above-mentioned the deficiencies in the prior art, the purpose of this utility model is to provide a kind of autonomous delayed type Inrush current restraining device, has function admirable, effectively reduces the impulse current in loop, simple circuit, working stability, the characteristics of applied range.
To achieve these goals, the utility model provides following technical scheme:
A kind of autonomous delayed type Inrush current restraining device, comprise voltage detection circuit, logic control circuit, auxiliary power circuit and electronic switch, voltage detection circuit one end is connected with major loop, other end andlogic control circuit is connected, logic control circuit is connected with electronic switching circuit, and control signal of simultaneously logic control circuit isolation output accessory power supply that is connected with the remote control end of main power circuit provides power supply for whole circuit; Voltage detection circuit carries out Real-Time Monitoring to the input in primary input loop, follow the corresponding state according to input voltage to produce autonomous time delay for logic control circuit provides corresponding triggering signal, then logic control circuit produces corresponding driving signal and controls the disconnection of electronic switch and open-minded, simultaneously logic control circuit also will, the opening and disconnect of an autonomous photoelectric coupling of time delay rear drive, be opened main power circuit or turn-off corresponding constantly.
Described voltage detection circuit comprises that polarity switching, input voltage sample circuit, benchmark and comparator form, described logic control circuit comprises the first autonomous delay circuit, the second autonomous delay circuit, reset circuit, buffer circuit and isolating switch circuit, wherein, polarity switching one end is connected with the input of loop of power circuit, the other end is connected with the input voltage sample circuit, the input voltage sample circuit carries out with an input of comparator, being connected after the dividing potential drop sampling to input voltage, and an other end of comparator is connected with benchmark, the output of comparator with reset and start-up circuit is connected, reset and start-up circuit is connected with the second delay circuit with the first delay circuit respectively again, the second delay circuit is subject to again the control of the first delay circuit simultaneously, and be connected with buffer circuit, the start signal of output power circuit rear class equipment, delay circuit 1 is connected with the buffer circuit input, buffer circuit output is connected with electronic switch, the control of formation to electronic switch, accessory power supply adopts the BUCK switching circuit, one end is connected with the polarity switching end, thereby being connected to respectively it, output generation DC12V voltage and input voltage circuit for detecting and logic control circuit provide power supply.
Described electronic switch is metal-oxide-semiconductor.
Adopt autonomous type dual-delay circuit, avoid the secondary surge impact produced fully.
Adopt the reset circuit mode, avoid in the short time re-powering the inefficacy of the surge restraint circuit of generation.
Accessory power supply has adopted the switch topology of BUCK, in utmost point wide input voltage range, all can effectively provide corresponding power supply, guarantees the circuit normal operation.
Adopt electronic switch to replace the relay system mechanical switch, improved the useful life of device.
Operation principle
At first the input circuit for detecting is monitored the input terminal voltage of loop of power circuit, when input being detected voltage arranged, start to start from delay circuit 1, the about 150mS(standard configuration of time delay) after, now the voltage of filtering capacitor completes the charging to capacitor fully by current-limiting resistor, and capacitor is charged to ceiling voltage; Now delay circuit 1 is exported high level by buffer circuit electronic switch is opened, and current-limiting resistor is shorting out.To start delay circuit 2 after delay circuit 1 time delay finishes simultaneously, after time delay 20mS, isolating switch be connected, and opened rear class equipment by isolating switch, complete start-up course.
During shutdown, when the input circuit for detecting detects the input dead electricity, will start reset circuit, two groups of delay circuits will be resetted, rapidly electronic switch and isolating switch be closed, prepare for starting next time.
Beneficial effect
1, function admirable, effectively reduce the impulse current in loop.
The utility model patent, for several shortcomings of traditional Inrush current restraining, has been carried out brand-new design and perfect.Thereby effectively avoided the secondary pulse problem under interior repeated priming of short time and rear class equipment on-line state.
2, simple circuit, working stability.
The utility model patent adopts pure hardware circuit, and the tolerance ability of whole circuit is also very strong, and the value of the corresponding device that only need calculate by theory is assembled, and can meet the requirement of technical indicator.Be suitable for streamline production.This circuit has higher disturbance ability simultaneously, is used in strongly disturbing occasion, work that also can be stable.
3, applied range
The utility model patent, have the autonomous type delay circuit, also has independently accessory power supply, and its operating state is not subject to the impact of rear class equipment simultaneously.This has just widened the occasion of its application greatly.Not only can be for the inhibition of the surge current of the charge circuit of capacitor, the startup of light fixture that also can be less for cold-state resistance, and the inhibition of the switching current of transformer etc.
The accompanying drawing explanation
Fig. 1 is the utility model theory diagram;
Fig. 2 is the application principle figure of the utility model in alternating current circuit;
Fig. 3 is the application principle figure of the utility model in DC circuit.
Embodiment
A kind of autonomous delayed type Inrush current restraining device, comprise voltage detection circuit, logic control circuit, auxiliary power circuit and electronic switch, voltage detection circuit one end is connected with major loop, other end andlogic control circuit is connected, logic control circuit is connected with electronic switching circuit, and control signal of simultaneously logic control circuit isolation output accessory power supply that is connected with the remote control end of main power circuit provides power supply for whole circuit; Voltage detection circuit carries out Real-Time Monitoring to the input in primary input loop, follow the corresponding state according to input voltage to produce autonomous time delay for logic control circuit provides corresponding triggering signal, then logic control circuit produces corresponding driving signal and controls the disconnection of electronic switch and open-minded, simultaneously logic control circuit also will, the opening and disconnect of an autonomous photoelectric coupling of time delay rear drive, be opened main power circuit or turn-off corresponding constantly.
Described voltage detection circuit comprises that polarity switching, input voltage sample circuit, benchmark and comparator form, described logic control circuit comprises the first autonomous delay circuit, the second autonomous delay circuit, reset circuit, buffer circuit and isolating switch circuit, wherein, polarity switching one end is connected with the input of loop of power circuit, the other end is connected with the input voltage sample circuit, the input voltage sample circuit carries out with an input of comparator, being connected after the dividing potential drop sampling to input voltage, and an other end of comparator is connected with benchmark, the output of comparator with reset and start-up circuit is connected, reset and start-up circuit is connected with the second delay circuit with the first delay circuit respectively again, the second delay circuit is subject to again the control of the first delay circuit simultaneously, and be connected with buffer circuit, the start signal of output power circuit rear class equipment, delay circuit 1 is connected with the buffer circuit input, buffer circuit output is connected with electronic switch, the control of formation to electronic switch, accessory power supply adopts the BUCK switching circuit, one end is connected with the polarity switching end, thereby being connected to respectively it, output generation DC12V voltage and input voltage circuit for detecting and logic control circuit provide power supply.
Described electronic switch is metal-oxide-semiconductor.
Adopt autonomous type dual-delay circuit, avoid the secondary surge impact produced fully.
Adopt the reset circuit mode, avoid in the short time re-powering the inefficacy of the surge restraint circuit of generation.
Accessory power supply has adopted the switch topology of BUCK, in utmost point wide input voltage range, all can effectively provide corresponding power supply, guarantees the circuit normal operation.
Adopt electronic switch to replace the relay system mechanical switch, improved the useful life of device.
The utility model not only may, for the circuit (as shown in Figure 2) of ac-input type, also can have for direct-current input-type the circuit (as Fig. 3) of surge current requirement.
Surge suppression effect of the present utility model, the Surge suppression electric current level depend on surge current-limiting resistor in loop of power circuit, its computational methods are:
IL=Vinmax/RL
IL: the levels of current that be suppressed to
Vinmax: maximum input voltage
RL: the resistance of current-limiting resistor
Finally it should be noted that: obviously, above-described embodiment is only for this explanation example clearly is described, and is not the restriction to execution mode.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without also giving all execution modes.And the apparent variation of being amplified out thus or change are still among the protection range in this explanation.
Claims (7)
1. an autonomous delayed type Inrush current restraining device, comprise voltage detection circuit, logic control circuit, auxiliary power circuit and electronic switch, it is characterized in that: voltage detection circuit one end is connected with major loop, other end andlogic control circuit is connected, logic control circuit is connected with electronic switching circuit, and control signal of simultaneously logic control circuit isolation output accessory power supply that is connected with the remote control end of main power circuit provides power supply for whole circuit; Voltage detection circuit carries out Real-Time Monitoring to the input in primary input loop, follow the corresponding state according to input voltage to produce autonomous time delay for logic control circuit provides corresponding triggering signal, then logic control circuit produces corresponding driving signal and controls the disconnection of electronic switch and open-minded, simultaneously logic control circuit also will, the opening and disconnect of an autonomous photoelectric coupling of time delay rear drive, be opened main power circuit or turn-off corresponding constantly.
2. inhibitor according to claim 1 is characterized in that: described voltage detection circuit comprises that polarity switching, input voltage sample circuit, benchmark and comparator form, described logic control circuit comprises the first autonomous delay circuit, the second autonomous delay circuit, reset circuit, buffer circuit and isolating switch circuit, wherein, polarity switching one end is connected with the input of loop of power circuit, the other end is connected with the input voltage sample circuit, the input voltage sample circuit carries out with an input of comparator, being connected after the dividing potential drop sampling to input voltage, and an other end of comparator is connected with benchmark, the output of comparator with reset and start-up circuit is connected, reset and start-up circuit is connected with the second delay circuit with the first delay circuit respectively again, the second delay circuit is subject to again the control of the first delay circuit simultaneously, and be connected with buffer circuit, the start signal of output power circuit rear class equipment, delay circuit 1 is connected with the buffer circuit input, buffer circuit output is connected with electronic switch, the control of formation to electronic switch, accessory power supply adopts the BUCK switching circuit, one end is connected with the polarity switching end, thereby being connected to respectively it, output generation DC12V voltage and input voltage circuit for detecting and logic control circuit provide power supply.
3. inhibitor according to claim 2, it is characterized in that: described electronic switch is metal-oxide-semiconductor.
4. inhibitor according to claim 3, is characterized in that: adopt autonomous type dual-delay circuit, avoid the secondary surge impact produced fully.
5. inhibitor according to claim 4 is characterized in that: adopt the reset circuit mode, avoid in the short time re-powering the inefficacy of the surge restraint circuit of generation.
6. inhibitor according to claim 5, it is characterized in that: accessory power supply has adopted the switch topology of BUCK, in utmost point wide input voltage range, all can effectively provide corresponding power supply, guarantees the circuit normal operation.
7. inhibitor according to claim 6, is characterized in that: adopted electronic switch to replace the relay system mechanical switch, improved the useful life of device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203928200U CN203326589U (en) | 2013-07-03 | 2013-07-03 | Automatic-delay-type surge-current inhibitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013203928200U CN203326589U (en) | 2013-07-03 | 2013-07-03 | Automatic-delay-type surge-current inhibitor |
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| Publication Number | Publication Date |
|---|---|
| CN203326589U true CN203326589U (en) | 2013-12-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013203928200U Expired - Fee Related CN203326589U (en) | 2013-07-03 | 2013-07-03 | Automatic-delay-type surge-current inhibitor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103762835A (en) * | 2014-01-24 | 2014-04-30 | 成都熊谷加世电器有限公司 | Starting inrush current suppression circuit |
| CN112072623A (en) * | 2017-06-08 | 2020-12-11 | 广东易百珑智能科技有限公司 | Control system and device for inhibiting surge current and application method thereof |
-
2013
- 2013-07-03 CN CN2013203928200U patent/CN203326589U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103762835A (en) * | 2014-01-24 | 2014-04-30 | 成都熊谷加世电器有限公司 | Starting inrush current suppression circuit |
| CN103762835B (en) * | 2014-01-24 | 2016-01-20 | 成都熊谷加世电器有限公司 | A kind of power-on surge current suppresses circuit |
| CN112072623A (en) * | 2017-06-08 | 2020-12-11 | 广东易百珑智能科技有限公司 | Control system and device for inhibiting surge current and application method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131204 Termination date: 20170703 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |