CN109039022A - A kind of chip breaking circuit and the Switching Power Supply comprising the circuit - Google Patents
A kind of chip breaking circuit and the Switching Power Supply comprising the circuit Download PDFInfo
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- CN109039022A CN109039022A CN201810851233.0A CN201810851233A CN109039022A CN 109039022 A CN109039022 A CN 109039022A CN 201810851233 A CN201810851233 A CN 201810851233A CN 109039022 A CN109039022 A CN 109039022A
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 12
- 239000003990 capacitor Substances 0.000 claims description 29
- 238000002955 isolation Methods 0.000 claims description 27
- 230000005611 electricity Effects 0.000 claims description 5
- 230000003111 delayed effect Effects 0.000 abstract description 4
- 239000004065 semiconductor Substances 0.000 description 18
- 238000010586 diagram Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/28—Modifications for introducing a time delay before switching
- H03K17/284—Modifications for introducing a time delay before switching in field effect transistor switches
Abstract
The invention discloses a kind of chip breaking circuit and comprising the Switching Power Supply of the circuit, chip breaking circuit includes first input port, the second input port, output port, biasing circuit, switching circuit and pull-down 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 pull-down 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 chip breaking 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 invention discloses a kind of chip breaking circuit and comprising the Switching Power Supply of the circuit, in particular to Switching Power Supply every
Breaking circuit from driving chip and the Switching Power Supply comprising the circuit.
Background technique
In existing Switching Power Supply, powerful product generally can all use double-transistor flyback, recommend, half-bridge and full-bridge etc. more
Complicated circuit topology, the circuit structure of these circuit topologies determines can not be directly (hereafter simple with pulse width modulation chip
Pulse width is claimed to be modulated to " PWM ") control, if the voltage on the reference ground of the upper switch pipe of double-transistor flyback primary side power circuit is floating
Dynamic voltage, therefore, this kind of topology are needed using isolation drive chip, and the control signal of PWM chip is transferred to power conversion electricity
The master power switch pipe on road, and then control primary side power circuit.
There is longer turn on delay time (can be also simply referred to as conducting delay) and close in existing isolation drive chip
Disconnected delay time (can be also simply referred to as shutdown delay), the turn-off delay time of full-bridge circuit isolation drive chip is 100ns or so,
And half-bridge circuit isolation drive chip has then reached 200ns.Existing PWM chip is generally integrated with monocycle peak point current protection function
Can, when output short-circuit occurs, since short circuit current increases rapidly, magnetic core tends to be saturated, and sensibility reciprocal is sharply dropped to close to leakage inductance,
After the conducting of primary side power circuit switching tube, primary current is risen rapidly, and after triggering monocycle peak point current protection, PWM chip is stopped
Only output pwm signal, but isolation drive chip has a shutdown delay, in shutdown delay, the switching tube of primary side power circuit can be after
Continuous conducting, main power current continue to increase.By inductive current formula it is found that being 160V, primary side transformer in input voltage vin
When sensibility reciprocal Lp 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 chip breaking circuit and opening comprising the circuit
Powered-down source solves the problems, such as that existing isolation drive chip delays time length causes short circuit current excessive.
In order to solve the above technical problems, a kind of chip breaking circuit provided by the invention, comprising:
First input port, the second input port, output port, biasing circuit, switching circuit and pull-down circuit；
First input port connects the first input end of biasing circuit and the input terminal of pull-down circuit, the second input terminal simultaneously
Mouth connects the second input terminal of biasing circuit and the input terminal of switching circuit, the output end connection switch circuit of biasing circuit simultaneously
Control terminal, the output end of switching circuit is connected to the output mouth after being connected with the output end of pull-down circuit, output port is used for
Output control signal；
First input port and the second input port are used to input pwm signal, and first input port input high level prolongs
When first time after the second input terminal eloquence input high level, first input port overturning is that low level is delayed the after the second time
The overturning of two input terminal eloquence is low level；
Switching circuit is for controlling whether the second input port and output port are electrically connected, and biasing circuit is for raising first
The level voltage of input port input so that first input port and the second input port input be high level when switch
Circuit can work；Pull-down circuit is used to drag down output port output control letter when first input port input is low level
Number level；
Working condition of the chip breaking circuit within a duty cycle are as follows:
When the input of first input port is high level, and the input of the second input port is low level, switching circuit work
Make, biasing circuit does not work, and pull-down circuit does not work, and output port exports low level control signal；
When first input port and the second input port are high level, switching circuit works on, and biasing circuit is not
Work, pull-down circuit do not work, and output port output is the control signal of high level；
When the input overturning of first input port is that low level is opened when the input of the second input port continues as high level
Powered-down road stops working, biasing circuit work, pull-down circuit work, and output port exports low level control signal；
When the input of first input port continues as low level, when the input of the second input port also overturns as low level,
Switching circuit work, biasing circuit do not work, and pull-down circuit does not work, and output port exports low level control signal.
A kind of specific embodiment as biasing circuit, comprising: first capacitor and first diode, first capacitor
One end is biasing circuit first input end, and the other end of first capacitor and the cathode of first diode are connected to form biasing circuit
Output end, the anode of first diode are the second input terminal of biasing circuit.
Another specific embodiment as biasing circuit, comprising: first capacitor, the second capacitor and the one or two pole
Pipe, one end of first capacitor are biasing circuit first input end, and the other end of first capacitor is connected shape with one end of the second capacitor
At the output end of biasing circuit, the other end of the second capacitor is connected with the cathode of first diode, and the anode of first diode is
Second input terminal of biasing circuit.
A kind of specific embodiment as switching circuit, comprising: the first N-channel MOS pipe, first resistor and the second electricity
Resistance, the source electrode of the first N-channel MOS pipe are the input terminal of switching circuit, and the grid of the first N-channel MOS pipe is the control of switching circuit
End processed, the grid of the first N-channel MOS pipe are connected also after first resistor with the source electrode of the first N-channel MOS pipe, the first N-channel
The drain electrode of metal-oxide-semiconductor forms the output end of switching circuit after second resistance.
A kind of specific embodiment as pull-down circuit, comprising: the second diode, under the cathode of the second diode is
The input terminal of puller circuit, the second diode anode are the output end of pull-down circuit.
Another specific embodiment as pull-down circuit, comprising: the first PNP triode, the first PNP triode
Base stage be pull-down circuit input terminal, the output end of the transmitting extremely pull-down circuit of the first PNP triode, tri- pole the first PNP
The grounded collector of pipe.
The present invention also provides the Switching Power Supply comprising said chip breaking 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 connection isolation of the second input port is driven
The output port of dynamic chip, output port connect the driving end of master power switch pipe in power conversion circuit, at the first time for every
From driving chip turn on delay time, 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's company model is the isolation drive chip of FAN7382, and turn on delay time refers to from its LIN foot
For the time that high level to LO foot is between 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 or fairchild's company model be the isolation drive chip of FAN7382, turn-off delay time refers to from it
LIN foot is low level to the time that LO foot is between low level.
Beneficial effects of the present invention are as follows:
Chip breaking circuit of the invention is low level moment pull-down circuit energy when the input overturning of first input port
Enough level for directly dragging down output port, so that output port is without second time that was delayed i.e. exportable low level control letter
Number, for outputting it port and being connect with the driving end of master power switch pipe in power conversion circuit after Switching Power Supply, thus real
The shutdown delay of isolation drive chip is now reduced to 5ns or so.In specific implementing circuit, when the output end of PWM chip
Mouthful output when becoming low level from high level, the first N-channel MOS pipe shutdown, and being dragged down rapidly by the second diode described
Control port voltage, the shutdown of primary side power circuit effectively reduces the shutdown delay of isolation drive chip, and then reduces
The short circuit current of main power circuit under short-circuit condition.
Detailed description of the invention
Attached drawing 1 is the Switching Power Supply functional block diagram comprising chip breaking circuit of the present invention；
Attached drawing 2 is the circuit diagram comprising chip breaking circuit Switching Power Supply embodiment one of the present invention；
Attached drawing 3 is the circuit diagram comprising chip breaking circuit Switching Power Supply embodiment two of the present invention；
Attached drawing 4 is the circuit diagram comprising chip breaking circuit Switching Power Supply embodiment three 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 chip breaking circuit of the present invention, Switching Power Supply include: PWM chip, every
From driving chip and power conversion circuit；Chip breaking circuit includes: first input port GATE, the second input port OUT, defeated
Exit port G, biasing circuit, switching circuit and pull-down circuit；The first input end of first input port GATE connection biasing circuit
With the input terminal of pull-down circuit, the second input port OUT simultaneously connect biasing circuit the second input terminal and switching circuit it is defeated
Enter end, the output end of output port G connection switch circuit and the output end of pull-down circuit, the output end connection switch of biasing circuit
The control terminal of circuit；The output port of first input port GATE connection PWM chip, first input port OUT connection isolation are driven
Move the output port of chip, the driving end of the master power switch pipe in output port G connection power conversion circuit.
Inventive concept of the invention is to add said chip breaking circuit on the basis of existing Switching Power Supply, work as PWM
The output switching activity of chip is the low level moment, and the pull-down circuit in chip breaking circuit can directly drag down master power switch pipe
The level at end is driven, so that master power switch pipe driving end needs not move through after the intrinsic shutdown delay time of isolation drive chip i.e.
Exportable low level control signal realizes that the master power switch pipe in power conversion circuit rapidly switches off.
In order to enable those skilled in the art more fully understands the present invention, below with reference to specific embodiment carry out into
One step explanation.
Embodiment one
It as shown in Fig. 2, is the circuit diagram circuit comprising chip breaking circuit Switching Power Supply embodiment one of the present invention.
Biasing circuit includes first capacitor C1, first diode D1, and one end of capacitor C1 is connected with port GATE, capacitor C1
The other end be connected with the cathode of diode D1, the anode of diode D1 is connected with port OUT.
Switching circuit include the first N-channel MOS pipe TR1, first resistor R1, second resistance R2, the source electrode of metal-oxide-semiconductor TR1 with
The anode of diode D1 is connected, and the grid of metal-oxide-semiconductor TR1 is connected with the cathode of diode D1, the drain electrode of metal-oxide-semiconductor TR1 and resistance R2
One end be connected, the other end of resistance R2 is connected with port G, and one end of resistance R1 is connected with the source electrode of metal-oxide-semiconductor TR1, resistance R1
The other end be connected with the grid of metal-oxide-semiconductor TR1.
Pull-down circuit includes the second diode D2, and the anode of diode D2 is connected with port G, the cathode of diode D2 and end
Mouth GATE is connected.
Power conversion circuit includes input voltage source VIN, the first winding Np, the second N-channel MOS pipe TR2, ground wire port,
First one end winding Np is connected with input power VIN, and the other end of the first winding Np is connected with the drain electrode of metal-oxide-semiconductor TR2, metal-oxide-semiconductor
The grid of TR2 is connected with port G, and the source electrode of metal-oxide-semiconductor TR2 is connected with ground wire port.
The working principle of circuit is as follows:
After Switching Power Supply opens machine, PWM chip, isolation drive chip are started to work, when OUT output in port is high level, end
When mouth GATE output is low level, port GATE charges to capacitor C1 by diode D1 and port GATE, works as port
The sum of high level voltage overlap capacitance C1 both end voltage of GATE and the difference of the high level voltage of port OUT are greater than metal-oxide-semiconductor TR1
Turn-on threshold when, switching circuit start to work.
After port GATE exports high level, metal-oxide-semiconductor TR1 conducting, port OUT is after the conducting delay of isolation drive chip
High level is exported, port OUT is by resistance R2 to the gate charges of metal-oxide-semiconductor TR2, and port G becomes high level, and metal-oxide-semiconductor TR2 is led
It is logical.When GATE output in port becomes low level from high level, port OUT is still in isolation drive chip turn-off delay time
High level, capacitor C1 both end voltage are not enough to that metal-oxide-semiconductor TR1 is maintained to be connected, metal-oxide-semiconductor TR1 shutdown, while diode D2 is connected, fast
Speed drags down the voltage of control port G, metal-oxide-semiconductor TR2 shutdown, and port GATE carries out capacitor C1 by diode D1 and port GATE
Charging becomes low level when port OUT is exported after isolated drive circuit shutdown delay from high level, and capacitor C1 stopping is filled
Electricity.
Embodiment two
Attached drawing 3 is the circuit diagram comprising chip breaking circuit Switching Power Supply embodiment two of the present invention, working principle and reality
It is just the same to apply example one, unique difference is that biasing circuit further includes capacitor C2, one end of capacitor C2 and the yin of diode D1
Extremely it is connected, the other end of capacitor C2 is connected with the grid of metal-oxide-semiconductor TR1, and embodiment is controlled real by the partial pressure of capacitor C1, capacitor C2
The adjusting of existing bias voltage.Other all working processes and embodiment one are just the same, and details are not described herein.
Embodiment three
Attached drawing 4 is the circuit diagram comprising chip breaking circuit Switching Power Supply embodiment three of the present invention, working principle and reality
It is just the same to apply example one, unique difference is, pull-down circuit is PNP triode Q1, the emitter of PNP triode Q1 with it is described
Control port be connected, the base stage of PNP triode Q1 modulates output port with the pulse width and is connected, PNP triode Q1
Grounded collector, when port GATE becomes low level from high level, triode Q1 conducting, port G is connect by triode Q1
The voltage on ground, port G is pulled low, metal-oxide-semiconductor TR1 shutdown.Other all working processes and embodiment one are just the same, herein no longer
It repeats.
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, protection scope of the present invention should be defined by the scope defined by the claims..For the art
For those of ordinary skill, without departing from the spirit and scope of the present invention, several improvements and modifications can also be made, these change
It also should be regarded as protection scope of the present invention into retouching.
Claims (7)
1. a kind of chip breaking circuit, comprising: first input port, the second input port, output port, biasing circuit, switch
Circuit and pull-down circuit；
First input port connects the first input end of biasing circuit and the input terminal of pull-down circuit simultaneously, and the second input port is same
When connection biasing circuit the second input terminal and switching circuit input terminal, the control of the output end connection switch circuit of biasing circuit
End processed, the output end of switching circuit are connected to the output mouth after being connected with the output end of pull-down circuit, output port is for exporting
Control signal；
First input port and the second input port are used to input pwm signal, first input port input high level delay the
Second input terminal eloquence input high level after one time, first input port overturning are defeated for after low level the second time of delay second
Entering the overturning of short-circuit end eloquence is low level；
Switching circuit is for controlling whether the second input port and output port are electrically connected, and biasing circuit is for raising the first input
The level voltage of port input so that first input port and the second input port input be high level when switching circuit
It can work；Pull-down circuit is used for when first input port input is low level, drags down output port output control signal
Level；
Working condition of the chip breaking circuit within a duty cycle are as follows:
When the input of first input port is high level, and the input of the second input port is low level, switching circuit work, partially
Circuits do not work, and pull-down circuit does not work, and output port exports low level control signal；
When first input port and the second input port are high level, switching circuit works on, and biasing circuit does not work,
Pull-down circuit does not work, and output port output is the control signal of high level；
When the input overturning of first input port is low level, when the input of the second input port continues as high level, switch electricity
Road stops working, biasing circuit work, pull-down circuit work, and output port exports low level control signal；
When the input of first input port continues as low level, when the input of the second input port also overturns as low level, switch
Circuit work, biasing circuit do not work, and pull-down circuit does not work, and output port exports low level control signal.
2. chip breaking circuit according to claim 1, it is characterised in that: biasing circuit includes: first capacitor and first
Diode, one end of first capacitor are biasing circuit first input end, the other end of first capacitor and the cathode of first diode
It is connected to form the output end of biasing circuit, the anode of first diode is the second input terminal of biasing circuit.
3. chip breaking circuit according to claim 1, it is characterised in that: biasing circuit includes: first capacitor, the second electricity
Hold and first diode, one end of first capacitor are biasing circuit first input end, the other end of first capacitor and the second capacitor
One end be connected to form the output end of biasing circuit, the other end of the second capacitor is connected with the cathode of first diode, the one or two
The anode of pole pipe is the second input terminal of biasing circuit.
4. chip breaking circuit according to claim 1, it is characterised in that: switching circuit include: the first N-channel MOS pipe,
First resistor and second resistance, the source electrode of the first N-channel MOS pipe are the input terminal of switching circuit, the grid of the first N-channel MOS pipe
The extremely control terminal of switching circuit, source electrode of the grid of the first N-channel MOS pipe also after first resistor with the first N-channel MOS pipe
It is connected, the drain electrode of the first N-channel MOS pipe forms the output end of switching circuit after second resistance.
5. chip breaking circuit according to claim 1, it is characterised in that: pull-down circuit includes: the second diode, and second
The cathode of diode is the input terminal of pull-down circuit, and the second diode anode is the output end of pull-down circuit.
6. chip breaking circuit according to claim 1, it is characterised in that: pull-down circuit includes: the first PNP triode,
The base stage of first PNP triode is the input terminal of pull-down circuit, the output of the transmitting extremely pull-down circuit of the first PNP triode
End, the grounded collector of the first PNP triode.
7. a kind of Switching Power Supply including any one of claim 1 to 6 chip breaking circuit, it is characterised in that: Switching Power Supply packet
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, is at the first time isolation drive chip turn on delay time, and the second time was isolation drive chip turn-off delay time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810851233.0A CN109039022B (en) | 2018-07-30 | 2018-07-30 | Chip turn-off circuit and switching power supply comprising same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810851233.0A CN109039022B (en) | 2018-07-30 | 2018-07-30 | Chip turn-off circuit and switching power supply comprising same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109039022A true CN109039022A (en) | 2018-12-18 |
| CN109039022B CN109039022B (en) | 2023-11-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810851233.0A Active CN109039022B (en) | 2018-07-30 | 2018-07-30 | Chip turn-off circuit and switching power supply comprising same |
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| US4701643A (en) * | 1986-03-24 | 1987-10-20 | Ford Microelectronics, Inc. | FET gate current limiter circuits |
| US4794281A (en) * | 1986-01-24 | 1988-12-27 | National Semiconductor Corporation | Speed-up circuit for transistor logic output device |
| JP2011041419A (en) * | 2009-08-17 | 2011-02-24 | Cosel Co Ltd | Switching power unit |
| CN203352423U (en) * | 2013-05-21 | 2013-12-18 | 东莞市盈聚电子有限公司 | Switching tube driving amplifying circuit for switching power supply |
| CN104410252A (en) * | 2014-12-11 | 2015-03-11 | 矽力杰半导体技术(杭州)有限公司 | Source electrode drive circuit and controlling method thereof |
| CN107026641A (en) * | 2015-12-17 | 2017-08-08 | 辛纳普蒂克斯日本合同会社 | Inverter circuit |
| CN208571903U (en) * | 2018-07-30 | 2019-03-01 | 广州金升阳科技有限公司 | A kind of chip breaking circuit and the Switching Power Supply comprising the circuit |
-
2018
- 2018-07-30 CN CN201810851233.0A patent/CN109039022B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4794281A (en) * | 1986-01-24 | 1988-12-27 | National Semiconductor Corporation | Speed-up circuit for transistor logic output device |
| US4701643A (en) * | 1986-03-24 | 1987-10-20 | Ford Microelectronics, Inc. | FET gate current limiter circuits |
| JP2011041419A (en) * | 2009-08-17 | 2011-02-24 | Cosel Co Ltd | Switching power unit |
| CN203352423U (en) * | 2013-05-21 | 2013-12-18 | 东莞市盈聚电子有限公司 | Switching tube driving amplifying circuit for switching power supply |
| CN104410252A (en) * | 2014-12-11 | 2015-03-11 | 矽力杰半导体技术(杭州)有限公司 | Source electrode drive circuit and controlling method thereof |
| CN107026641A (en) * | 2015-12-17 | 2017-08-08 | 辛纳普蒂克斯日本合同会社 | Inverter circuit |
| CN208571903U (en) * | 2018-07-30 | 2019-03-01 | 广州金升阳科技有限公司 | A kind of chip breaking circuit and the Switching Power Supply comprising the circuit |
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| Publication number | Publication date |
|---|---|
| CN109039022B (en) | 2023-11-17 |
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