CN107979073A - For the low-power consumption short-circuit protection circuit of DC/DC converters and guard method - Google Patents
For the low-power consumption short-circuit protection circuit of DC/DC converters and guard method Download PDFInfo
- Publication number
- CN107979073A CN107979073A CN201711483515.1A CN201711483515A CN107979073A CN 107979073 A CN107979073 A CN 107979073A CN 201711483515 A CN201711483515 A CN 201711483515A CN 107979073 A CN107979073 A CN 107979073A
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- Prior art keywords
- circuit
- short
- converters
- sampling
- divider resistance
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Links
- 238000000034 method Methods 0.000 title claims abstract description 7
- 238000005070 sampling Methods 0.000 claims abstract description 31
- 238000010248 power generation Methods 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000036581 peripheral resistance Effects 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC converters
Abstract
The invention discloses for the low-power consumption short-circuit protection circuit of DC/DC converters and guard method; sampling comparison circuit including the short-circuit sampled signal of access, input terminal connection sampling comparison circuit, the single-shot trigger circuit that output terminal is connected with the b poles of NPN switching transistors V2；The NPN switching transistors V2 further includes the e poles of ground connection and is connected to the c poles of DC/DC converter auxiliary power supplies.The present invention is by sampling comparison circuit and single-shot trigger circuit Combination Design; utilize the delay function of single-shot trigger circuit; cleverly realize under short-circuit condition; in a cycle for protecting circuit work; the DC/DC converter phases of being stopped hold time longer; and the phase that works is also just relatively short so that average short circuit power consumption can be reduced to ultra low levels, ensure that the reliability service of DC/DC converter circuits.
Description
Technical field
The present invention relates to DC/DC converters field, and in particular to the low-power consumption short-circuit protection circuit for DC/DC converters
And guard method.
Background technology
DC/DC converters are widely used in the military-civil Department of Electronics such as space flight, aviation, ship, weapons, electronics, medical treatment, industry
In system, corresponding short-circuit protection circuit is there is also extensive demand, and the standard become in DC/DC converter circuits is equipped with.
High speed development and technological progress with machine system, the requirement to DC/DC converters is also higher and higher, at present conventional short circuit
The short-circuit protection power consumption realized of protection circuit engineering, will be due to if there is the situation of short circuit for a long time mostly in more than 2W
Heat accumulation and cause circuit chips（Mainly power switch pipe）The excessive phenomenon of temperature rise, when temperature rise exceeds junction temperature of chip DC/
DC converters will damage loss of function.The realization of super low-power consumption short-circuit protection technology, which has, improves machine system reliability and longevity
The significance of life.
The content of the invention
It is an object of the invention to provide for the low-power consumption short-circuit protection circuit of DC/DC converters and guard method, it is somebody's turn to do
Circuit can not only reduce short-circuit dissipation, and ensure that the reliability service of circuit.
To achieve the above object, present invention employs following technical scheme：Low-power consumption short circuit for DC/DC converters is protected
Protection circuit, including the sampling comparison circuit of the short-circuit sampled signal of access, input terminal connection sampling comparison circuit, output terminal and NPN
The single-shot trigger circuit of the b poles connection of switching transistor V2；The NPN switching transistors V2 further includes e poles and the company of ground connection
It is connected to the c poles of DC/DC converter auxiliary power supplies.
Further, the sampling comparison circuit includes operational amplifier N1, sampling divider resistance R1, sampling divider resistance
R2 and benchmark divider resistance R3, benchmark divider resistance R4；The sampling divider resistance R1, sampling divider resistance R2 access fortune in parallel
Calculate the anode of amplifier N1；The negative terminal of the benchmark divider resistance R3, benchmark divider resistance R4 access operational amplifier N1 in parallel；
The other end access short-circuit signal sampling partial pressure of the sampling divider resistance R1 parallel connected ends.
Further, the single-shot trigger circuit includes 555 time base circuit N2, NPN switching transistor V1, peripheral resistance
R5, R6, R7 and capacitance C3, C4；Described V1, R5, R6 form phase inverter circuit；N2, R7, C3, C4 composition negative is monostable to be touched
Power Generation Road.
For the guard method of the low-power consumption short-circuit protection circuit of DC/DC converters, comprise the following steps：1）, circuit just
Often during work, the magnitude of voltage Vop1, Vop2 that are obtained after short-circuit signal sampling partial pressure<<The output electricity of Vop3, operational amplifier N1
Pressure Vop4 is equal to blanking voltage；555 time base circuit N2 form monostable circuit input terminal voltage Vop5 be Vop4 it is anti-phase with
The high level voltage obtained afterwards, the output terminal of VOP6 is low level, control pwm control circuit normal work；
2）, occur short circuit when, short-circuit signal sampling value Vop1 increase, Vop2>Vop3, the output voltage of operational amplifier N1
Vop4 becomes higher, and the input voltage Vop5 of N2 is changed into low level after anti-phase, and the output voltage of N2 becomes higher, and maintains this for a long time
High voltage；High level accesses the B poles of NPN triode, and pulse-width modulation circuit is stopped, and DC/DC converters are turned off；
3）, when input signal Vop1 is reduced to and compares under threshold value, the time-lag action of single-shot trigger circuit, delay one section when
Between after, power supply can just reenter normal operating conditions；When short-circuit condition still remains, DC/DC converters are again introduced into stopping
The work phase.
As shown from the above technical solution, the super low-power consumption short-circuit protection circuit of the present invention for DC/DC converters,
It is ingenious using the delay function of single-shot trigger circuit by sampling the Combination Design of comparison circuit and single-shot trigger circuit
Realize under short-circuit condition, protection circuit work a cycle in, the DC/DC converter phases of being stopped hold time compared with
It is long, and the phase that works is also just relatively short so that average short circuit power consumption can be reduced to ultra low levels, ensure that DC/DC converters
The reliability service of circuit, even if circuit in the case of long-time output short-circuit occur still will not damage.
Brief description of the drawings
Fig. 1 is the circuit block diagram of the present invention；
Fig. 2 is the circuit diagram that current sampling of the present invention compares delay circuit；
Fig. 3 is power switch tube drives oscillogram under short circuit state of the present invention.
Embodiment
The present invention will be further described below in conjunction with the accompanying drawings：
As shown in Figure 1, it is used for the super low-power consumption short-circuit protection circuit of DC/DC converters in the present embodiment, including sampling is more electric
Road and single-shot trigger circuit, the input terminal for sampling comparison circuit are connected with short-circuit sampled signal, its output terminal is touched with monostable
The input terminal of Power Generation Road is connected；The output terminal of single-shot trigger circuit is output to the b poles of a NPN switching transistor；Triode
E poles ground connection, c poles be connected to the auxiliary power supplies of DC/DC converters, the turn-on and turn-off by controlling NPN switching transistors can
To control whether DC/DC converter circuits work.
As shown in Fig. 2, sampling comparison circuit includes an operational amplifier N1 and resistance R1, R2, R3, R4 and electricity of periphery
Hold C1, C2 etc., sampled signal is by being input to the input positive terminal of the amplifier base with input negative terminal again when short-circuit after R1, R2 partial pressure
One high level signal Vop4 of output is compared and enlarged in quasi- voltage (being obtained by R3 and R4 partial pressures).Single-shot trigger circuit includes
555 time base circuit N2, NPN switching transistor V1 and resistance R5, R6, R7 and capacitance C3, C4 of periphery.Signal Vop4 is input to
The phase inverter circuit that V1, R5, R6 are formed, high level paraphase is low level, and the negative for being input to N2, R7, C3, C4 composition is monostable tactile
Power Generation Road, exports a high level Vop6 afterwards, and maintains this high level for a long time.
As shown in figure 3, to apply power switch tube drives under the DC/DC converter output short-circuit states of circuit of the present invention
Oscillogram.Due to delay circuit, there are T2>>T1, greatly reduces short-circuit dissipation, minimum to reach below 0.3W.
The operation principle of the present invention：
Vop1 is the magnitude of voltage of acquisition after short-circuit signal sampling partial pressure.
When circuit works normally, Vop2<<The output voltage Vop4 of Vop3, operational amplifier N1 are equal to blanking voltage, and 555
The input terminal voltage Vop5 for the monostable circuit that time base circuit N2 is formed is the anti-phase high level voltages obtained later of Vop4, N6's
Output terminal is low level, control pwm control circuit normal work.
Short circuit phenomenon occurs, and the sampling value Vop1 increases of short-circuit signal, reach Vop2>Vop3, operational amplifier N1's is defeated
Going out voltage Vop4 to become higher, at this time, the input voltage Vop5 of N2 is changed into low level after anti-phase, the output voltage of N2 becomes higher, and
Maintain this high voltage for a long time.High level is added to the B poles of NPN triode so that pulse-width modulation circuit is stopped, and DC/DC becomes
Parallel operation is turned off.Compare even if input signal Vop1 is reduced at this time under threshold value, since the delay of single-shot trigger circuit is made
With, it is necessary to delay a period of time, power supply can just reenter normal operating conditions, if short-circuit condition still remains at this time, DC/
DC converters are again introduced into the phase of being stopped.So in cycles.Drive waveforms on switching tube such as Fig. 3 at this time, DC/DC are converted
Device is operated in a resting state, wherein T2>>T1, ensure that the power consumption control of converter in the range of very little, long-term short
Road will not be damaged.
Embodiment described above is only that the preferred embodiment of the present invention is described, not to the model of the present invention
Enclose and be defined, on the premise of design spirit of the present invention is not departed from, technical side of the those of ordinary skill in the art to the present invention
The various modifications and improvement that case is made, should all fall into the protection domain that claims of the present invention determines.
Claims (4)
1. the low-power consumption short-circuit protection circuit for DC/DC converters, it is characterised in that：Including taking for the short-circuit sampled signal of access
Sample comparison circuit, input terminal connection sampling comparison circuit, output terminal are touched with the monostable that the b poles of NPN switching transistors V2 are connected
Power Generation Road；The NPN switching transistors V2 further includes the e poles of ground connection and is connected to the c poles of DC/DC converter auxiliary power supplies.
2. the low-power consumption short-circuit protection circuit according to claim 1 for DC/DC converters, it is characterised in that：It is described
Sampling comparison circuit includes operational amplifier N1, sampling divider resistance R1, sampling divider resistance R2 and benchmark divider resistance R3, base
Quasi- divider resistance R4；The anode of the sampling divider resistance R1, sampling divider resistance R2 access operational amplifier N1 in parallel；It is described
The negative terminal of benchmark divider resistance R3, benchmark divider resistance R4 access operational amplifier N1 in parallel；The sampling divider resistance R1 is simultaneously
Join the other end access short-circuit signal sampling partial pressure Vop1 at end.
3. the low-power consumption short-circuit protection circuit according to claim 1 for DC/DC converters, it is characterised in that：It is described
Single-shot trigger circuit includes 555 time base circuit N2, NPN switching transistor V1, periphery resistance R5, R6, R7 and capacitance C3, C4；
Described V1, R5, R6 form phase inverter circuit；Described N2, R7, C3, C4 form negative single-shot trigger trigger.
4. being used for the guard method of the low-power consumption short-circuit protection circuit of DC/DC converters as claimed in claim 1, its feature exists
In：Comprise the following steps：1）, circuit normal work when, short-circuit signal sampling partial pressure after obtain magnitude of voltage Vop1, Vop2<<
The output voltage Vop4 of Vop3, operational amplifier N1 are equal to blanking voltage；555 time base circuit N2 form monostable circuit it is defeated
It is the anti-phase high level voltages obtained later of Vop4 to enter terminal voltage Vop5, and the output terminal of Vop6 is low level, control PWM control electricity
Road works normally；
2）, occur short circuit when, short-circuit signal sampling value Vop1 increase, Vop2>Vop3, the output voltage of operational amplifier N1
Vop4 becomes higher, and the input voltage Vop5 of N2 is changed into low level after anti-phase, and the output voltage of N2 becomes higher, and maintains this for a long time
High voltage；High level accesses the B poles of NPN triode, and pulse-width modulation circuit is stopped, and DC/DC converters are turned off；
3）, when input signal Vop1 is reduced to and compares under threshold value, the time-lag action of single-shot trigger circuit, delay one section when
Between after, power supply can just reenter normal operating conditions；When short-circuit condition still remains, DC/DC converters are again introduced into stopping
The work phase.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711483515.1A CN107979073A (en) | 2017-12-29 | 2017-12-29 | For the low-power consumption short-circuit protection circuit of DC/DC converters and guard method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711483515.1A CN107979073A (en) | 2017-12-29 | 2017-12-29 | For the low-power consumption short-circuit protection circuit of DC/DC converters and guard method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107979073A true CN107979073A (en) | 2018-05-01 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711483515.1A Pending CN107979073A (en) | 2017-12-29 | 2017-12-29 | For the low-power consumption short-circuit protection circuit of DC/DC converters and guard method |
Country Status (1)
| Country | Link |
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| CN (1) | CN107979073A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109980607A (en) * | 2019-04-10 | 2019-07-05 | 苏州浪潮智能科技有限公司 | A kind of short-circuit protection method and device of voltage regulator circuit |
| CN115802550A (en) * | 2022-12-08 | 2023-03-14 | 珠海市圣昌电子有限公司 | High-reliability short-circuit protection circuit for PWM dimming |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0991170A1 (en) * | 1998-09-28 | 2000-04-05 | STMicroelectronics S.r.l. | Integrated protection from the effects of a short circuit of the output of a flyback converter |
| CN201263084Y (en) * | 2008-09-11 | 2009-06-24 | 核工业理化工程研究院 | Protection circuit for electronic gun power supply |
| CN202797872U (en) * | 2012-09-25 | 2013-03-13 | 天水七四九电子有限公司 | Novel short-circuit protection circuit |
| CN105262055A (en) * | 2015-08-31 | 2016-01-20 | 国网河南省电力公司电力科学研究院 | Overcurrent protection circuit with adjustable intermittent time |
| CN205489443U (en) * | 2015-12-31 | 2016-08-17 | 深圳市汇川技术股份有限公司 | Power overcurrent protection circuit |
| CN207664602U (en) * | 2017-12-29 | 2018-07-27 | 中国电子科技集团公司第四十三研究所 | Low-power consumption short-circuit protection circuit for DC/DC converters |
-
2017
- 2017-12-29 CN CN201711483515.1A patent/CN107979073A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0991170A1 (en) * | 1998-09-28 | 2000-04-05 | STMicroelectronics S.r.l. | Integrated protection from the effects of a short circuit of the output of a flyback converter |
| CN201263084Y (en) * | 2008-09-11 | 2009-06-24 | 核工业理化工程研究院 | Protection circuit for electronic gun power supply |
| CN202797872U (en) * | 2012-09-25 | 2013-03-13 | 天水七四九电子有限公司 | Novel short-circuit protection circuit |
| CN105262055A (en) * | 2015-08-31 | 2016-01-20 | 国网河南省电力公司电力科学研究院 | Overcurrent protection circuit with adjustable intermittent time |
| CN205489443U (en) * | 2015-12-31 | 2016-08-17 | 深圳市汇川技术股份有限公司 | Power overcurrent protection circuit |
| CN207664602U (en) * | 2017-12-29 | 2018-07-27 | 中国电子科技集团公司第四十三研究所 | Low-power consumption short-circuit protection circuit for DC/DC converters |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109980607A (en) * | 2019-04-10 | 2019-07-05 | 苏州浪潮智能科技有限公司 | A kind of short-circuit protection method and device of voltage regulator circuit |
| CN115802550A (en) * | 2022-12-08 | 2023-03-14 | 珠海市圣昌电子有限公司 | High-reliability short-circuit protection circuit for PWM dimming |
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| PB01 | Publication | ||
| PB01 | Publication | ||
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Application publication date: 20180501 |