CN107248858A - A kind of electronic switch with upper electric damping characteristics - Google Patents
A kind of electronic switch with upper electric damping characteristics Download PDFInfo
- Publication number
- CN107248858A CN107248858A CN201710346313.6A CN201710346313A CN107248858A CN 107248858 A CN107248858 A CN 107248858A CN 201710346313 A CN201710346313 A CN 201710346313A CN 107248858 A CN107248858 A CN 107248858A
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- CN
- China
- Prior art keywords
- resistance
- source
- load
- pole
- fet
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- 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.)
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
- H03K17/082—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit
- H03K17/0828—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit in composite switches
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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
- H02H9/025—Current limitation using field effect transistors
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/16—Modifications for eliminating interference voltages or currents
- H03K17/161—Modifications for eliminating interference voltages or currents in field-effect transistor switches
- H03K17/165—Modifications for eliminating interference voltages or currents in field-effect transistor switches by feedback from the output circuit to the control circuit
- H03K17/166—Soft switching
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/567—Circuits characterised by the use of more than one type of semiconductor device, e.g. BIMOS, composite devices such as IGBT
Abstract
The invention discloses a kind of electronic switch with upper electric damping characteristics, it is connected between dc source DC and load RL, by three resistance, one triode, one electric capacity and a FET are constituted, it can be embedded into various high-low pressure load circuits, because FET T1 has very high pressure-resistant and extremely low conducting resistance, in the application scenario that some power are larger, both load can be protected from the surge impact of powered on moment, the current stresses of power switch powered on moment can be substantially reduced again, it can be made into the integration module with two inputs and two output ends, it is directly appended in existing product-laden, the product for not possessing upper electric pooling feature originally is set to realize soft start, it is prevented effectively from impact of electric current (or voltage) surge of powered on moment to load, the service life of product can greatly be extended.
Description
Technical field
The present invention relates to a kind of electronic switch, particularly a kind of electronic switch being connected between dc source and load.
Background technology
The same applicant of the application have submitted that entitled " a kind of LED linear constant current is soft to open to Patent Office of the People's Republic of China not long ago
The patent application of dynamic drive circuit ", Application No. " 2017100900028 ", drive circuit is included by resistance R7 and electric capacity C1
Parallel connection constitute charging and discharging circuit to realize soft start, it is subsequent in actual use, it has been found that using resistance R7
To electric capacity electric discharge, it is necessary to which the electric energy of regular hour electric capacity C1 storages can discharge completely, the short of electricity is gone up at once after a loss of power
In time, because electric capacity C1 electric energy does not discharge also completely, cause soft start effect undesirable.
The content of the invention
In order to overcome the deficiencies in the prior art, the present invention provides a kind of highly versatile, resetting time it is short have upper electricity slow
Rush the electronic switch of characteristic.
The technical solution adopted for the present invention to solve the technical problems is：
A kind of electronic switch with upper electric damping characteristics, is connected between dc source DC and load RL, including positive-negative-positive
Triode T2, FET T1, resistance R2, resistance R3 and diode D3；The latter termination institute of resistance R2 and resistance R3 series connection
State dc source DC positive pole DC+, another termination dc source DC positive pole DC-；The base stage of the triode T2 meets institute
Resistance R2 and resistance R3 node are stated, colelctor electrode meets the negative pole DC- of the dc source DC, and emitter stage connects the diode D3's
Negative pole, the positive pole of the diode D3 meets the positive pole DC+ of the dc source DC by resistance R1；The transmitting of the triode T2
Electric capacity C1 is connected between the negative pole DC- of pole and diode D3 negative pole node and the dc source DC；The FET
T1 grid connects the positive pole of the diode D3 and resistance R1 node, and source electrode meets the negative pole DC- of the dc source DC, drain electrode
To load RL negative terminals.
The beneficial effects of the invention are as follows：The present invention uses three resistance, a triode, an electric capacity and a field-effect
Pipe constitutes upper electricity buffering electronic switch, can be embedded into various high-low pressure load circuits, because FET T1 is with very high
Pressure-resistant and extremely low conducting resistance, in the application scenario that some power are larger, can both protect load from powered on moment
Surge impact, can substantially reduce the current stresses of power switch powered on moment again, can be made into having two inputs and
The integration module of two output ends, is directly appended in existing product-laden, makes the production for not possessing upper electric pooling feature originally
Product can realize soft start, be prevented effectively from impact of electric current (or voltage) surge of powered on moment to load, can greatly extend
The service life of product.
Brief description of the drawings
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1 is the circuit theory diagrams of the present invention.
Embodiment
A kind of reference picture 1, electronic switch with upper electric damping characteristics is connected to dc source DC and load RL (non-electrical
Inductive load) between, including PNP type triode T2, FET T1, resistance R2, resistance R3 and diode D3；The resistance R2
With the latter termination dc source DC of resistance R3 series connection positive pole DC+, another termination dc source DC positive pole DC-；
The base stage of the triode T2 connects the resistance R2 and resistance R3 node, and colelctor electrode meets the negative pole DC- of the dc source DC,
Emitter stage connects the negative pole of the diode D3, and the positive pole of the diode D3 connects the positive pole of the dc source DC by resistance R1
DC+；Connected between the emitter stage of the triode T2 and diode D3 negative pole node and the dc source DC negative pole DC-
There is electric capacity C1；The grid of the FET T1 connects the positive pole of the diode D3 and resistance R1 node, and source electrode connects described straight
Power supply DC negative pole DC- is flowed, is drained to load RL negative terminals, load RL positive pole meets dc source DC positive pole DC+.
In powered on moment, load RL passes through electricity by FET T1 formation loop, dc source DC positive pole DC+ voltages
Resistance R1 is added to FET T1 grid.Resistance R1, diode D3, electric capacity C1 constitute a unidirectional charging circuit of RCD, direct current
Power supply DC positive pole DC+ charges by resistance R1, diode D3 to electric capacity C1, and the initial voltage at electric capacity C1 two ends is 0V, field effect
Should pipe T1 grid voltage be pulled low, FET T1 is in by armed state, and load RL two ends do not have electric current to pass through, with
Charging interval continues, and the voltage at electric capacity C1 two ends slowly climbs, when the voltage reaches FET T1 threshold voltage, field
Effect pipe T1, which is begun to turn on, enters working condition, operating current is provided for load RL, because FET T1 grid voltage is
Slowly climb from low to high, thus be supplied to load RL electric current be also slowly to rise from low to high, when electric capacity C1 two ends charging
Complete, then FET T1 grid voltage also reaches normal operating voltage, FET T1 also saturation conductions therewith, are negative
Carry RL and operating current in full is provided, realize buffer starting, the time length of buffer starting depends on RC charge constants.
After a loss of power, due to diode D3 individual event buffer action, electric capacity C1 will not produce influence to FET T1.Three
Pole pipe T2, resistance R2, resistance R3, electric capacity C1 constitute a repid discharge loop, when powered on moment and normal work, resistance R2 and
The current potential of resistance R3 nodes is in high level, and triode T2 is in cut-off state, the chargings of electric capacity C1 on startup are not influenceed
Journey, after power-off, because resistance R2 is connected to the power-off of positive source one end, causes triode T2 base potential to pass through under resistance R3
Draw, moment is changed into low level, turn on triode T2, rapidly by the charge discharge at electric capacity C1 two ends, system Rapid reset, it is to avoid
Buffering effect is influenceed due to the depositing electricity of electric capacity C1 two ends when being re-powered after power-off in the short time, upper electricity at once after power-off
The soft start function of product is not interfered with, the quick discharging circuit being made up of resistance R2, resistance R3 in circuit and triode T2,
Buffering electric capacity C1 two ends are parallel to, the slow-paced problem of conductive discharge is efficiently solved, compensate for the same Shen of the application
Ask someone to have submitted the patent application of entitled " a kind of LED linear constant current soft start drive circuit " to Patent Office of the People's Republic of China not long ago,
The circuit defect of Application No. " 2017100900028 ".
The upper electricity buffering electronic switch of the present invention can be embedded into the various high-low pressure load (electric heating in such as household electrical appliance
Device, LED illumination lamp etc.) in circuit, because FET T1 has very high pressure-resistant and extremely low conducting resistance, in some work(
The larger application scenario of rate, can both protect load from the surge impact of powered on moment, power switch can be substantially reduced again
The current stresses of powered on moment, can be made into (being used for the positive pole DC+ and negative pole for connecting dc source DC with two inputs
Two terminals of DC-) and two output ends (being used for two terminals for connecting load RL both positive and negative polarities) integration module, be directly appended to
In existing product-laden, the product for not possessing upper electric pooling feature originally is realized soft start, be prevented effectively from electric wink
Between impact of electric current (or voltage) surge to load, can greatly extend the service life of product.
Claims (1)
1. a kind of electronic switch with upper electric damping characteristics, is connected between dc source DC and load RL, it is characterised in that
It includes PNP type triode T2, FET T1, resistance R2, resistance R3 and diode D3；Resistance R2 and resistance the R3 series connection
Latter termination dc source DC positive pole DC+, another termination dc source DC positive pole DC-；The triode T2
Base stage connect the resistance R2 and resistance R3 node, colelctor electrode meets the negative pole DC- of the dc source DC, and emitter stage connects described
Diode D3 negative pole, the positive pole of the diode D3 meets the positive pole DC+ of the dc source DC by resistance R1；Three pole
Electric capacity C1 is connected between pipe T2 emitter stage and diode D3 negative pole node and the dc source DC negative pole DC-；Institute
The grid for stating FET T1 connects the positive pole of the diode D3 and resistance R1 node, and source electrode connects the negative of the dc source DC
Pole DC-, drains to load RL negative terminals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710346313.6A CN107248858A (en) | 2017-05-17 | 2017-05-17 | A kind of electronic switch with upper electric damping characteristics |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710346313.6A CN107248858A (en) | 2017-05-17 | 2017-05-17 | A kind of electronic switch with upper electric damping characteristics |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107248858A true CN107248858A (en) | 2017-10-13 |
Family
ID=60017079
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710346313.6A Pending CN107248858A (en) | 2017-05-17 | 2017-05-17 | A kind of electronic switch with upper electric damping characteristics |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107248858A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107947557A (en) * | 2017-12-05 | 2018-04-20 | 合肥华耀电子工业有限公司 | A kind of soft starting circuit of anti-over-pressed, under-voltage surge |
| CN109104078A (en) * | 2018-08-10 | 2018-12-28 | 珠海格力电器股份有限公司 | A kind of managing device of power supply, power supply and its management method |
| CN111541224A (en) * | 2020-04-29 | 2020-08-14 | 中国电子科技集团公司第十四研究所 | Anti-surge circuit suitable for transient state frequent switching on and shutting down |
| CN111585266A (en) * | 2020-04-20 | 2020-08-25 | 上海泓语电气技术有限公司 | DC distribution electronic soft start switch |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08205403A (en) * | 1995-01-30 | 1996-08-09 | Fujitsu Ltd | Rush current preventing circuit |
| CN1674438A (en) * | 2004-03-23 | 2005-09-28 | 华为技术有限公司 | Circuit for positive power source inputting load electrifying slow starting |
| CN101252309A (en) * | 2008-02-04 | 2008-08-27 | 中兴通讯股份有限公司 | Direct-current power supply slow startup control circuit |
| CN201181903Y (en) * | 2008-04-01 | 2009-01-14 | 中兴通讯股份有限公司 | Input circuit of DC power supply |
| CN203984377U (en) * | 2014-05-27 | 2014-12-03 | 广东金莱特电器股份有限公司 | One is with soft start and turn-off switching circuit fast |
| CN106329503A (en) * | 2016-11-30 | 2017-01-11 | 电子科技大学中山学院 | Surge current suppression circuit applied to ALD (atomic layer deposition) equipment |
| CN106604481A (en) * | 2017-02-20 | 2017-04-26 | 王汉忠 | LED linear constant current soft start drive circuit |
-
2017
- 2017-05-17 CN CN201710346313.6A patent/CN107248858A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08205403A (en) * | 1995-01-30 | 1996-08-09 | Fujitsu Ltd | Rush current preventing circuit |
| CN1674438A (en) * | 2004-03-23 | 2005-09-28 | 华为技术有限公司 | Circuit for positive power source inputting load electrifying slow starting |
| CN101252309A (en) * | 2008-02-04 | 2008-08-27 | 中兴通讯股份有限公司 | Direct-current power supply slow startup control circuit |
| CN201181903Y (en) * | 2008-04-01 | 2009-01-14 | 中兴通讯股份有限公司 | Input circuit of DC power supply |
| CN203984377U (en) * | 2014-05-27 | 2014-12-03 | 广东金莱特电器股份有限公司 | One is with soft start and turn-off switching circuit fast |
| CN106329503A (en) * | 2016-11-30 | 2017-01-11 | 电子科技大学中山学院 | Surge current suppression circuit applied to ALD (atomic layer deposition) equipment |
| CN106604481A (en) * | 2017-02-20 | 2017-04-26 | 王汉忠 | LED linear constant current soft start drive circuit |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107947557A (en) * | 2017-12-05 | 2018-04-20 | 合肥华耀电子工业有限公司 | A kind of soft starting circuit of anti-over-pressed, under-voltage surge |
| CN107947557B (en) * | 2017-12-05 | 2023-07-04 | 合肥华耀电子工业有限公司 | Soft start circuit for resisting overvoltage and undervoltage surges |
| CN109104078A (en) * | 2018-08-10 | 2018-12-28 | 珠海格力电器股份有限公司 | A kind of managing device of power supply, power supply and its management method |
| CN109104078B (en) * | 2018-08-10 | 2019-10-01 | 珠海格力电器股份有限公司 | A kind of managing device of power supply, power supply and its management method |
| CN111585266A (en) * | 2020-04-20 | 2020-08-25 | 上海泓语电气技术有限公司 | DC distribution electronic soft start switch |
| CN111585266B (en) * | 2020-04-20 | 2023-05-30 | 上海泓语电气技术有限公司 | Direct-current power distribution electronic soft start switch |
| CN111541224A (en) * | 2020-04-29 | 2020-08-14 | 中国电子科技集团公司第十四研究所 | Anti-surge circuit suitable for transient state frequent switching on and shutting down |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20171013 |
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| WD01 | Invention patent application deemed withdrawn after publication |