CN109245052A - A kind of short-circuit protection circuit and the Switching Power Supply comprising the circuit - Google Patents
A kind of short-circuit protection circuit and the Switching Power Supply comprising the circuit Download PDFInfo
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- CN109245052A CN109245052A CN201810995074.1A CN201810995074A CN109245052A CN 109245052 A CN109245052 A CN 109245052A CN 201810995074 A CN201810995074 A CN 201810995074A CN 109245052 A CN109245052 A CN 109245052A
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 10
- 238000002955 isolation Methods 0.000 claims description 31
- 239000003990 capacitor Substances 0.000 claims description 20
- 230000005611 electricity Effects 0.000 claims description 3
- 230000003111 delayed effect Effects 0.000 abstract 2
- 239000004065 semiconductor Substances 0.000 description 13
- 238000010586 diagram Methods 0.000 description 6
- 238000004804 winding Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Classifications
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- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
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Abstract
The invention discloses a kind of short-circuit protection circuit, short-circuit protection circuit includes first input port, the second input port, output port, switching circuit and reset circuit；First input port and the second input port are used to input pwm signal, first input port input high level is delayed the second input terminal eloquence input high level after first time, and first input port overturning be that just to overturn be low level for the second input short port after low level the second time of delay；When the input overturning of first input port is the level that low level moment switching circuit can directly drag down output port, so that output port is without the second time i.e. exportable low level control signal that is delayed；It after short-circuit protection circuit is used for Switching Power Supply, outputs it port and is connect with the driving end of master power switch pipe in power conversion circuit, be able to achieve and realize that the master power switch pipe in Switching Power Supply power conversion circuit rapidly switches off.
Description
Technical field:
The present invention discloses a kind of short-circuit protection circuit and the Switching Power Supply comprising the circuit, in particular to uses isolation drive
The short-circuit protection of the Switching Power Supply of chip.
Background technique:
In existing module power supply, powerful product generally can all use double-transistor flyback, recommend, half-bridge and full-bridge etc. more
Complicated circuit topology, since these circuit topologies include that two or more switching tubes need to control, partial-topology need every
From driving, such as double-transistor flyback, full-bridge, therefore can not directly with pulse width modulation chip, (hereinafter referred pulse width is modulated to
" PWM ") it is controlled, this kind of topology is needed using isolation drive chip, and the control signal of PWM chip is transferred to power switch
Pipe, and then control the switching tube in power circuit.
There is longer conducting and shutdown delay in existing isolation drive chip, full-bridge circuit isolation drive chip
Shutdown delay is 100ns or so, and half-bridge circuit isolation drive chip has then reached 200ns.Existing PWM chip is generally integrated
Monocycle peak point current defencive function, when output short-circuit, main power current is increased rapidly, when primary current peak value reaches guarantor
After protecting setting value, PWM chip turns off driving signal, but since isolation drive chip has shutdown delay, primary side power switch tube
It will just be turned off after the duration of conducting shutdown delay, in this period, the electric current of the main power of primary side will continue to rise.Most of short
Under conditions of road, after the short circuit current of main power can make the saturation of magnetic core of transformer, magnetic core of transformer be saturated, sensibility reciprocal can be sharply
Decline.By inductive current formula it is found that when input voltage vin is 160V, the sensibility reciprocal Lp of primary side transformer falls to 0.5 μ H,
Turn-on time Ton corresponding short circuit current size when being 200ns are as follows:
Therefore, the turn-off delay time of isolation drive chip is longer will lead to short circuit current increase, thus it requires main power
Device need to meet biggish current stress specification, influence the type selecting of device.
Summary of the invention
In view of this, the technical problem to be solved in the present invention is to provide a kind of short-circuit protection circuits and opening comprising the circuit
Powered-down source solves the existing Switching Power Supply using isolation drive chip under high voltage short circuit state, the excessive problem of short circuit current.
In order to solve the above technical problems, a kind of short-circuit protection circuit provided by the invention, comprising:
First input port, the second input port, output port, switching circuit and reset circuit；
Switching circuit is equipped with first input port, the second input port and output port, reset circuit connection switch circuit；
First input port input is pwm signal；
When the level of first input port input is high level, switching circuit does not work, the second input port delay the
The second high level is inputted after one time, switching circuit receives the second high level and exports third high level to output port；
When the level overturning of first input port input is low level, switching circuit work, and drag down output port
Voltage, the second input port input the second low level after the second time of delay, and switching circuit stops working, and reset circuit starts work
Make, and stops working before first input port is overturn again as high level.
A kind of specific embodiment as switching circuit, comprising: first capacitor, first diode, first resistor,
Two resistance, the first PNP triode, one end of first capacitor are connected with the second input port, the other end of first capacitor and first
One end of resistance is connected after being connected with the emitter of the first PNP triode, and the other end of first resistor is connected with output port, the
One end of two resistance is connected with first input port, and the other end of second resistance is connected with the cathode of first diode, and the one or two
The anode of pole pipe is connected with the base stage of the first PNP triode, the grounded collector of the first PNP triode.
A kind of specific embodiment as reset circuit, comprising: the second diode, the cathode of the second diode and
The emitter of one PNP triode is connected, the plus earth of the second diode.
Another specific embodiment as switching circuit, comprising: first capacitor, first resistor and the one or two pole
Pipe, one end of first capacitor is connected with the second input port, the other end of first capacitor be connected with one end of first resistor afterwards and
The anode of first diode connects, and the cathode of first diode connects first input port；The other end connection of first resistor is defeated
Exit port.
Another specific embodiment as reset circuit, comprising: the cathode of the second diode, the second diode connects
Connect the anode of first diode, the plus earth of the second diode.
The present invention also provides the Switching Power Supply comprising above-mentioned short-circuit protection circuit, Switching Power Supply includes PWM chip, isolation drive
Dynamic chip and power conversion circuit, first input port connect the output port of PWM chip and the output end of isolation drive chip
Mouthful, another output port of the second input port connection time isolation driving chip, output port connects main in power conversion circuit
The driving end of power switch tube is at the first time isolation drive chip turn on delay time, and the second time was isolation drive chip
Turn-off delay time.
Term is explained:
Isolation drive chip turn on delay time: isolation drive chip is from Continuity signal is received to output drive signal
Time, such as fairchild company FAN7382 from LIN foot be high level to the time that LO is high level；
Isolation drive chip turn-off delay time: isolation drive chip is from cut-off signals are received to shutdown driving signal
Time, such as fairchild company FAN7382 from LIN foot be low level to the time that LO is low level；
Beneficial effects of the present invention are as follows:
Short-circuit protection circuit of the invention can directly drag down the level of output port, in the state of high voltage short circuit, when
After primary current peak value reaches protection setting value, while PWM chip output turns off, output port level is dragged down immediately, is used for
After Switching Power Supply, outputs it port and connect with the driving end of master power switch pipe in power conversion circuit, rapidly switch off power
Master power switch pipe in translation circuit realizes the shutdown of master power switch pipe delay being reduced to 5ns or so, efficiently solve because
Under high voltage short circuit state caused by the shutdown delay of isolation drive chip is longer, the excessive problem of main power circuit short circuit current.
Detailed description of the invention
Attached drawing 1 is the Switching Power Supply functional block diagram comprising short-circuit protection circuit of the present invention；
Attached drawing 2 is the circuit diagram comprising short-circuit protection circuit Switching Power Supply embodiment one of the present invention；
Attached drawing 3 is the circuit diagram comprising short-circuit protection circuit Switching Power Supply embodiment two of the present invention.
Specific embodiment
The present invention will be further described with reference to the accompanying drawing:
Fig. 1 is the Switching Power Supply functional block diagram comprising short-circuit protection circuit of the present invention, and Switching Power Supply includes: short-circuit protection electricity
Road, pwm chip, isolation drive chip and power conversion circuit；Short-circuit protection circuit include: first input port GATE,
Second input port OUT, output port G, switching circuit and reset circuit；First input port GATE connection switch circuit, the
Two input port connection switch circuits, output port G connection switch circuit, reset circuit connection switch circuit；First input end
The output port of mouth GATE connection PWM chip, the output port of first input port OUT connection isolation drive chip, output end
The input port of mouth G connection power conversion circuit.
Inventive concept of the invention is to add above-mentioned short-circuit protection circuit on the basis of existing Switching Power Supply, work as PWM
When chip output is high level, short-circuit protection circuit does not work, and isolation drive chip exports after delay is normally connected
High level is to primary side metal-oxide-semiconductor, and when PWM chip output is low level by high level overturning, short-circuit protection circuit drags down rapidly original
The grid voltage of side metal-oxide-semiconductor turns off primary side metal-oxide-semiconductor.
For the present invention is more clearly understood, with reference to the accompanying drawings and embodiments, the present invention is described in more detail.It answers
When pointing out, the specific embodiments described herein are merely illustrative of the present invention, is not intended to limit the present invention.
First embodiment
It as shown in Fig. 2, is the circuit diagram circuit comprising short-circuit protection circuit Switching Power Supply embodiment one of the present invention.
Switching circuit includes first capacitor C1, first diode D1, first resistor R1, second resistance R2, tri- pole the first PNP
Pipe Q1, one end of capacitor C1 are connected with the second input port, the other end of capacitor C1 be connected with resistance R1 after and PNP triode Q1
Emitter be connected, the other end of resistance R1 is connected with output port, and one end of resistance R2 is connected with first input port, resistance
The other end of R2 is connected with the cathode of diode D1, and the anode of diode D1 is connected with the base stage of PNP triode Q1, tri- pole PNP
The grounded collector of pipe Q1.
A kind of specific embodiment as reset circuit, comprising: the second diode D2, the cathode of diode D2 with
The emitter of PNP triode Q1 is connected, the plus earth of diode D2.
Power conversion circuit includes input voltage source VIN, the first winding Np, the first N-channel MOS pipe TR1, the second N-channel
The drain electrode of metal-oxide-semiconductor TR2, metal-oxide-semiconductor TR1 are connected with input voltage source VIN, the grid of metal-oxide-semiconductor TR1 and isolation drive chip every
It is connected from driving end, the source electrode of metal-oxide-semiconductor TR1 is connected with first one end winding Np, the leakage of the other end and metal-oxide-semiconductor TR2 of winding Np
Extremely it is connected, the grid of metal-oxide-semiconductor TR2 is connected with port G, and the source electrode of metal-oxide-semiconductor TR2 is connected with ground wire port GND.
Term is explained:
The isolation drive end of isolation drive chip: the end that isolation drive is carried out to the NMOS tube that source voltage floats is realized
Mouthful, such as port HO of such as FAN7382 of fairchild company；
The working principle of circuit is as follows:
After Switching Power Supply opens machine, PWM chip, isolation drive chip are started to work, after port GATE exports high level, end
Mouth OUT exports high level after the conducting delay of isolation drive chip, and port OUT is by capacitor C1, resistance R1 to metal-oxide-semiconductor TR2
Gate charges, metal-oxide-semiconductor TR1 conducting, control port G becomes high level.
When GATE output in port becomes low level from high level, since the tie point of capacitor C1 at this time and resistance R1 is height
Level, forward conduction between the emitter and base stage of PNP triode, diode D1 conducting lead to PNP triode Q1 saturation conduction,
The voltage of control port G, metal-oxide-semiconductor TR2 shutdown are dragged down rapidly, while capacitor C1 is started to charge, port OUT is by isolation drive electricity
Output becomes low level, diode D2 conducting from high level after the shutdown delay of road, and capacitor C1 passes through isolation drive chip, diode
D2 discharges rapidly.
Second embodiment
Attached drawing 3 is the circuit diagram comprising short-circuit protection circuit Switching Power Supply embodiment two of the present invention, and the main distinction is,
It drives pull-down circuit not use resistance R2, triode Q1, but uses the anode of diode D1 and the cathode of diode D2
It is connected after being connected with capacitor C1 with the tie point of resistance R1.Its working principle and embodiment one are almost the same, and the main distinction is,
When GATE drive level becomes low level from high level, pwm chip exports GATE pin and passes through diode D1 for MOS
The grid voltage of pipe TR2 drags down, it is desirable that pwm chip GATE foot has stronger sink current ability, other all working mistakes
Journey and embodiment one are just the same, and details are not described herein.
The above is only the preferred embodiment of the present invention, it is noted that above-mentioned preferred embodiment is not construed as pair
Limitation of the invention, for those skilled in the art, without departing from the spirit and scope of the present invention, also
Several improvements and modifications can be made, these modifications and embellishments should also be considered as the scope of protection of the present invention, no longer uses example here
It repeats, protection scope of the present invention should be defined by the scope defined by the claims..
Claims (6)
1. a kind of short-circuit protection circuit, it is characterised in that: include: first input port, the second input port, output port, open
Powered-down road and reset circuit；
The switching circuit is equipped with first input port, the second input port and output port, reset circuit connection switch electricity
Road；
First input port input is pwm signal；
When first input port input level be high level when, switching circuit does not work, the second input port delay first when
Between after input the second high level, switching circuit receive the second high level simultaneously export third high level to output port；
When the level overturning of first input port input is low level, switching circuit work, and the voltage of output port is dragged down,
Second input port inputs the second low level after the second time of delay, and switching circuit stops working, and reset circuit is started to work, and
And it stops working before first input port is overturn again as high level.
2. short-circuit protection circuit according to claim 1, it is characterised in that: the switching circuit include: first capacitor,
First diode, first resistor, second resistance, the first PNP triode, one end of first capacitor are connected with the second input port,
The other end of first capacitor is connected after being connected with one end of first resistor with the emitter of the first PNP triode, first resistor
The other end is connected with output port, and one end of second resistance is connected with first input port, the other end of second resistance and first
The cathode of diode is connected, and the anode of first diode is connected with the base stage of the first PNP triode, the collection of the first PNP triode
Electrode ground connection.
3. short-circuit protection circuit according to claim 2, it is characterised in that: the reset circuit includes: the two or two pole
Pipe, the cathode of the second diode are connected with the emitter of the first PNP triode, the plus earth of the second diode.
4. short-circuit protection circuit according to claim 1, it is characterised in that: the switching circuit include first capacitor,
First resistor and first diode, one end of first capacitor are connected with the second input port, the other end of first capacitor and first
One end of resistance is connect after being connected with the anode of first diode, and the cathode of first diode connects first input port；First
The other end of resistance connects output port.
5. short-circuit protection circuit according to claim 4, it is characterised in that: the reset circuit includes the two or two pole
Pipe, the anode of the cathode connection first diode of the second diode, the plus earth of the second diode.
6. a kind of Switching Power Supply comprising above any one of claims 1 to 5 short-circuit protection circuit, it is characterised in that: also wrap
PWM chip, isolation drive chip and power conversion circuit are included, first input port connects the output port of PWM chip, and second is defeated
Inbound port connects the output port of isolation drive chip, and output port connects the driving of master power switch pipe in power conversion circuit
End.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810995074.1A CN109245052B (en) | 2018-08-29 | 2018-08-29 | Short-circuit protection circuit and switching power supply comprising same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810995074.1A CN109245052B (en) | 2018-08-29 | 2018-08-29 | Short-circuit protection circuit and switching power supply comprising same |
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| CN109245052A true CN109245052A (en) | 2019-01-18 |
| CN109245052B CN109245052B (en) | 2024-04-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110378155A (en) * | 2019-06-25 | 2019-10-25 | 苏州浪潮智能科技有限公司 | A kind of server serial port disabling protection circuit, method |
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| CN206099313U (en) * | 2016-08-12 | 2017-04-12 | 武汉港迪电气传动技术有限公司 | Converter switching power supply's short -circuit protection circuit |
| CN208753970U (en) * | 2018-08-29 | 2019-04-16 | 广州金升阳科技有限公司 | A kind of short-circuit protection circuit and the Switching Power Supply comprising the circuit |
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2018
- 2018-08-29 CN CN201810995074.1A patent/CN109245052B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4890020A (en) * | 1987-06-08 | 1989-12-26 | U.S. Philips Corporation | Circuit for driving a semiconductor device with protection against transients |
| CN102332705A (en) * | 2011-10-25 | 2012-01-25 | 杭州日鼎控制技术有限公司 | Short-circuit protection circuit of insulated gate bipolar translator (IGBT) of high-power frequency conversion device |
| CN103579995A (en) * | 2012-08-01 | 2014-02-12 | 艾默生网络能源有限公司 | Direct-current input switching power source and undervoltage protection circuit thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110378155A (en) * | 2019-06-25 | 2019-10-25 | 苏州浪潮智能科技有限公司 | A kind of server serial port disabling protection circuit, method |
| CN110378155B (en) * | 2019-06-25 | 2021-06-29 | 苏州浪潮智能科技有限公司 | Server serial port forbidding protection circuit and method |
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