CN104022489B - With the power source short-circuit protection system and method restarted automatically with soft start function - Google Patents
With the power source short-circuit protection system and method restarted automatically with soft start function Download PDFInfo
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Abstract
The present invention provides a kind of with the power source short-circuit protection system and method restarted automatically with soft start function, and the system includes PWM controller, also including power supply circuit, soft starting circuit and short-circuit protection circuit.The present invention also provides a kind of with the guard method restarted automatically with the power source short-circuit protection system of soft start function.The present invention realizes that power supply circuit is restarted automatically and is reset automatically with soft starting circuit by short-circuit protection circuit; inrush current triggering short-circuit protection circuit after can effectively preventing short-circuit protection from terminating is again introduced into guard mode and cannot recover normal; because inrush current is effectively suppressed; there can be bigger capacitance load capability than the conventional hiccup formula short-circuit protection circuit with soft start function, it is adaptable to various power-supply systems.
Description
Technical field
It is specifically a kind of with the electricity restarted automatically with soft start function the present invention relates to power source short-circuit protection technical field
Source short circuit protection system and method.
Background technology
Short circuit protection system is the core protection location in power-supply system, and its effect is to detect the short circuit guarantor in power-supply system
Shield state, and power supply is controlled, electric current is excessive when preventing short circuit causes the damage of power-supply system.With soft start function
In normal power supplies short circuit protection system, soft starting circuit can effectively prevent the overshoot of input current only in power initiation, when
There is short-circuit condition in power output end, after short circuit protection system realizes that short-circuit protection, short-circuit condition are exited, power output end voltage
During returning to normal value, the input current overshoot during overswing ratio power initiation of input current is big, and especially power supply capacitive is born
When carrying larger, easily triggering short circuit protection system is again introduced into guard mode, causes short-circuit protection misoperation.
The content of the invention
It is an object of the invention to provide it is a kind of with restart automatically with the power source short-circuit protection system of soft start function and
Method, the input current overshoot during reducing short circuit and after short-circuit condition disappearance, it is to avoid short-circuit protection misoperation occur.
The technical scheme is that：
It is a kind of with the power source short-circuit protection system restarted automatically with soft start function, including be connected with main power circuit
PWM controller, the main power circuit is made up of metal-oxide-semiconductor, transformer and sampling resistor, and the output end of the PWM controller connects
The grid of metal-oxide-semiconductor is connect, the source electrode of the metal-oxide-semiconductor is grounded by sampling resistor, and its drain electrode is connected to by transformer primary side winding
Power input voltage, also including power supply circuit, soft starting circuit and short-circuit protection circuit；
The power supply circuit, is that PWM controller, soft starting circuit and short-circuit protection circuit are supplied for providing output voltage
Electricity；
The soft starting circuit, the voltage for receiving power supply circuit produces soft-start signal to open PWM controller
Output, makes power supply start working；
The short-circuit protection circuit, for after electric thereon, if detecting power output end short circuit occurs, closing PWM
The output of controller is so that power supply is stopped, while electric charge that soft starting circuit absorbs is discharged to make it into holding state,
And the output voltage of power supply circuit is dragged down so that it cannot power；After its lower electricity, power supply circuit restores electricity, soft starting circuit
The output of PWM controller is again turned on, power supply is started working；If detecting power output end short circuit to disappear, protect power supply
Normal operating conditions is held, if it is still short-circuit to detect power output end, above-mentioned action is repeated, until short-circuit condition disappears.
It is described with the power source short-circuit protection system restarted automatically with soft start function, the power supply circuit is steady by first
Pressure diode and the first current-limiting resistance are constituted, the plus earth of first voltage-regulator diode, and its negative electrode is by the first current limliting electricity
Resistance is connected to power input voltage；The power end of the PWM controller is connected to the first voltage-regulator diode and the first current-limiting resistance
Between node；
The soft starting circuit includes RCD absorbing circuits and PNP triode, and the RCD absorbing circuits are by resistance, electric capacity
Constituted with diode, one end ground connection of the electric capacity, the resistance and diode that its other end passes through and connects is connected to the first voltage stabilizing
Node between diode and the first current-limiting resistance；Node and PNP triode between the resistance, electric capacity and diode three
Base stage connection, the emitter stage of the PNP triode connects the feedback end of PWM controller, its grounded collector；
The short-circuit protection circuit includes comparator, the first NPN triode, the second NPN triode and the poles of the 3rd NPN tri-
Pipe；The power end of the comparator is connected to the node between the first voltage-regulator diode and the first current-limiting resistance, its homophase input
End is connected to the node between metal-oxide-semiconductor and sampling resistor, and its inverting input is connected to the second voltage-regulator diode and the second current limliting
Node between resistance, second voltage-regulator diode and the second current-limiting resistance constitute reference voltage circuit, second voltage stabilizing
The plus earth of diode, its negative electrode is connected to power input voltage by the second current-limiting resistance；
The output end of the comparator respectively with the first NPN triode, the second NPN triode and the 3rd NPN triode
Base stage is connected；The emitter stage of first NPN triode, the second NPN triode and the 3rd NPN triode is grounded；Described
The colelctor electrode of one NPN triode is connected to the node between PNP triode and PWM controller, the colelctor electrode of the second NPN triode
The node between resistance, electric capacity and diode three is connected to, the colelctor electrode of the 3rd NPN triode is connected to the pole of the first voltage stabilizing two
Node between pipe and the first current-limiting resistance.
Described is a kind of with the guard method restarted automatically with the power source short-circuit protection system of soft start function, including with
Lower step：
（1）Power supply circuit provides output voltage, is that PWM controller, soft starting circuit and short-circuit protection circuit are powered, PWM
Electricity on controller, soft starting circuit and short-circuit protection circuit；
（2）On soft starting circuit after electricity, soft-start signal is produced to open the output of PWM controller, power supply is started working；
（3）On short-circuit protection circuit after electricity, whether detection power output end there is short circuit, if so, then performing step（4）,
If it is not, then power supply keeps normal operating conditions；
（4）Short-circuit protection circuit closes the output of PWM controller so that power supply is stopped, while discharging soft starting circuit
The electric charge of absorption drags down the output voltage of power supply circuit so that it cannot power to make it into holding state；Short-circuit protection
Under circuit after electricity, power supply circuit is restored electricity, and soft starting circuit is again turned on the output of PWM controller, and power supply is started working, returned
Return step（3）.
The present invention realizes that power supply circuit is restarted automatically and reset automatically with soft starting circuit by short-circuit protection circuit, Ke Yiyou
Inrush current triggering short-circuit protection circuit after effect prevents short-circuit protection from terminating is again introduced into guard mode and cannot recover
Normally, because inrush current is effectively suppressed, can be than the conventional hiccup formula short-circuit protection circuit with soft start function
With bigger capacitance load capability, it is adaptable to various power-supply systems.
Brief description of the drawings
Fig. 1 is the electrical block diagram of the specific embodiment of the invention.
Specific embodiment
Below in conjunction with the accompanying drawings the present invention is further illustrated with specific embodiment.
As shown in figure 1, a kind of with the power source short-circuit protection system restarted automatically with soft start function, including PWM controls
Device 2, power supply circuit 3, soft starting circuit 4, reference voltage circuit 5 and short-circuit protection circuit 6.The main work(of PWM controller 2 and power supply
Rate circuit 1 is connected, and main power circuit 1 is made up of NMOS tube Q0, transformer T and sampling resistor R0, the grid connection of NMOS tube Q0
The output end of PWM controller, the source electrode of NMOS tube Q0 is grounded by sampling resistor R0, and the drain electrode of NMOS tube Q0 passes through transformer T
Primary side winding be connected to power input voltage Vin.
Power supply circuit 3 is made up of the first voltage-regulator diode Dz1 and the first current-limiting resistance R1, the first voltage-regulator diode Dz1's
Plus earth, the negative electrode of the first voltage-regulator diode Dz1 is connected to power input voltage Vin by the first current-limiting resistance R1.PWM is controlled
The power end of device processed 2 is connected to the node between the first voltage-regulator diode Dz1 and the first current-limiting resistance R1.
Soft starting circuit 4 includes RCD absorbing circuits and PNP triode Q, RCD absorbing circuit by resistance R, electric capacity C and two poles
Pipe D is constituted, and one end ground connection of electric capacity C, the resistance R and diode D that the other end of electric capacity C passes through and connects is connected to the first voltage stabilizing two
Node between pole pipe Dz1 and the first current-limiting resistance R1.Node and the poles of PNP tri- between resistance R, electric capacity C and diode D three
The base stage connection of pipe Q, the emitter stage of PNP triode Q connects the feedback end of PWM controller 2, and the colelctor electrode of PNP triode Q connects
Ground.
Reference voltage circuit 5 is made up of the second voltage-regulator diode Dz2 and the second current-limiting resistance R2, the second voltage-regulator diode
The plus earth of Dz2, the negative electrode of the second voltage-regulator diode Dz2 is connected to power input voltage Vin by the second current-limiting resistance R2.
Short-circuit protection circuit 6 includes comparator V, the first NPN triode Q1, the second NPN triode Q2 and the 3rd NPN tri- poles
Pipe Q3.The power end of comparator V is connected to the node between the first voltage-regulator diode Dz1 and the first current-limiting resistance R1, comparator V
In-phase input end be connected to node between NMOS tube Q0 and sampling resistor R0, the inverting input of comparator V is connected to
Node between two voltage-regulator diode Dz2 and the second current-limiting resistance R2.
The output end of comparator V base stage, the base stage of the second NPN triode Q2 and respectively with the first NPN triode Q1
The base stage connection of three NPN triode Q3.The emitter stage and the 3rd of the emitter stage of the first NPN triode Q1, the second NPN triode Q2
The emitter stage of NPN triode Q3 is grounded.The colelctor electrode of the first NPN triode Q1 is connected to PNP triode Q and PWM controller 2
Between node, the colelctor electrode of the second NPN triode Q2 is connected to the node between resistance R, electric capacity C and diode D three,
The colelctor electrode of three NPN triode Q3 is connected to the node between the first voltage-regulator diode Dz1 and the first current-limiting resistance R1.
Operation principle of the invention：
After power input voltage Vin is changed through transformer T, then by rectifying and wave-filtering, output DC voltage Vo.Normal condition
Under, the supply voltage of the first voltage-regulator diode Dz1 is set up, electricity on PWM controller 2, comparator V, meanwhile, on the voltage of electric capacity C
Rise, the emitter voltage of PNP triode Q rises, when it rises to certain phase, the output pwm signal of PWM controller 2, power supply
Start steady operation.When short-circuit condition occurs in power output end, the homophase input terminal voltage of comparator V is higher than negative-phase input
Reference voltage, comparator V output high level, the first NPN triode Q1 drags down the feedback terminal voltage of PWM controller 2, so as to close
Pwm signal output is closed, the second NPN triode Q2 discharges the electric charge on electric capacity C, soft starting circuit 4 is started in next time
Shi Zuoyong, the 3rd NPN triode Q3 by the voltage pull-down of the first voltage-regulator diode Dz1, under making PWM controller 2 and comparator V
Electricity.Now, due to electricity under comparator V, comparator V do not work, its output end no signal, it is impossible to control the first NPN triode Q1,
Second NPN triode Q2 and the 3rd NPN triode Q3 is acted, then the first voltage-regulator diode Dz1 starts to recover normal power supply, PWM
Electricity on controller 2 and comparator V, meanwhile, the voltage of electric capacity C rises, and the emitter voltage of PNP triode Q rises, when its rising
During to certain phase, the output pwm signal of PWM controller 2, power supply is started working.If now the short-circuit condition of power output end is
Disappear, then power supply keeps normal operating conditions, if now still in short-circuit condition, short-circuit protection circuit 6 carries out above-mentioned again
Action, until the short-circuit condition of power output end disappears.
The above implementation method is only that the preferred embodiment of the present invention is described, not to model of the invention
Enclose and be defined, on the premise of design spirit of the present invention is not departed from, those of ordinary skill in the art are to technical side of the invention
Various modifications and improvement that case is made, all should fall into the protection domain of claims of the present invention determination.
Claims (3)
1. a kind of with the power source short-circuit protection system restarted automatically with soft start function, including be connected with main power circuit
PWM controller, the main power circuit is made up of metal-oxide-semiconductor, transformer and sampling resistor, and the output end of the PWM controller connects
The grid of metal-oxide-semiconductor is connect, the source electrode of the metal-oxide-semiconductor is grounded by sampling resistor, and its drain electrode is connected to by transformer primary side winding
Power input voltage, it is characterised in that：Also include power supply circuit, soft starting circuit and short-circuit protection circuit；
The power supply circuit, is that PWM controller, soft starting circuit and short-circuit protection circuit are powered for providing output voltage；
The soft starting circuit, the voltage for receiving power supply circuit produces soft-start signal to open the defeated of PWM controller
Go out, power supply is started working；
The short-circuit protection circuit, for after electric thereon, if detecting power output end short circuit occurs, closing PWM controls
The output of device is so that power supply is stopped, while discharging electric charge that soft starting circuit absorbs so that soft starting circuit enters standby shape
State, and the output voltage of power supply circuit is dragged down so that power supply circuit cannot power；After electricity under short-circuit protection circuit, power supply circuit
Restore electricity, soft starting circuit is again turned on the output of PWM controller, power supply is started working；If detecting power output end
Short circuit disappears, then power supply is kept normal operating conditions, if it is still short-circuit to detect power output end, repeats above-mentioned action,
Until short-circuit condition disappears.
2. according to claim 1 with the power source short-circuit protection system restarted automatically with soft start function, its feature exists
In：The power supply circuit is made up of the first voltage-regulator diode and the first current-limiting resistance, and the anode of first voltage-regulator diode connects
Ground, its negative electrode is connected to power input voltage by the first current-limiting resistance；It is steady that the power end of the PWM controller is connected to first
Node between pressure diode and the first current-limiting resistance；
The soft starting circuit includes RCD absorbing circuits and PNP triode, and the RCD absorbing circuits are by resistance, electric capacity and two
Pole pipe is constituted, and one end ground connection of the electric capacity, the resistance and diode that its other end passes through and connects is connected to the pole of the first voltage stabilizing two
Node between pipe and the first current-limiting resistance；The base of node and PNP triode between the resistance, electric capacity and diode three
Pole connects, and the emitter stage of the PNP triode connects the feedback end of PWM controller, its grounded collector；The negative electrode of diode connects
The node between the first voltage-regulator diode and the first current-limiting resistance is connected to, the anode of diode is connected to the base stage of PNP triode；
The short-circuit protection circuit includes comparator, the first NPN triode, the second NPN triode and the 3rd NPN triode；Institute
State the node that the power end of comparator is connected between the first voltage-regulator diode and the first current-limiting resistance, the connection of its in-phase input end
To the node between metal-oxide-semiconductor and sampling resistor, its inverting input be connected to the second voltage-regulator diode and the second current-limiting resistance it
Between node, second voltage-regulator diode and the second current-limiting resistance constitute reference voltage circuit, second voltage-regulator diode
Plus earth, its negative electrode is connected to power input voltage by the second current-limiting resistance；
The output end of the comparator respectively with the base stage of the first NPN triode, the second NPN triode and the 3rd NPN triode
Connection；The emitter stage of first NPN triode, the second NPN triode and the 3rd NPN triode is grounded；First NPN
The colelctor electrode of triode is connected to the node between PNP triode and PWM controller, the colelctor electrode connection of the second NPN triode
Node between resistance, electric capacity and diode three, the colelctor electrode of the 3rd NPN triode be connected to the first voltage-regulator diode with
Node between first current-limiting resistance.
3. according to claim 1 a kind of with the protection restarted automatically with the power source short-circuit protection system of soft start function
Method, it is characterised in that comprise the following steps：
（1）Power supply circuit provides output voltage, is that PWM controller, soft starting circuit and short-circuit protection circuit are powered, PWM controls
Electricity on device, soft starting circuit and short-circuit protection circuit；
（2）On soft starting circuit after electricity, soft-start signal is produced to open the output of PWM controller, power supply is started working；
（3）On short-circuit protection circuit after electricity, whether detection power output end there is short circuit, if so, then performing step（4）, if it is not,
Then power supply keeps normal operating conditions；
（4）Short-circuit protection circuit closes the output of PWM controller so that power supply is stopped, while discharge soft starting circuit absorbing
Electric charge to make it into holding state, and drag down the output voltage of power supply circuit so that it cannot power；Short-circuit protection circuit
After lower electricity, power supply circuit is restored electricity, and soft starting circuit is again turned on the output of PWM controller, and power supply is started working, and returns to step
Suddenly（3）.
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| CN105429106B (en) * | 2015-12-08 | 2018-01-23 | 广州金升阳科技有限公司 | A kind of output short circuit protection circuit of Switching Power Supply |
| CN106211469B (en) * | 2016-08-24 | 2018-01-09 | 横店集团得邦照明股份有限公司 | A kind of drive device and its implementation with short-circuit protection circuit |
| CN108183465A (en) * | 2018-03-05 | 2018-06-19 | 广州金升阳科技有限公司 | A kind of power-supply system output short circuit protection circuit and its control method |
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| CN110545031B (en) * | 2019-07-26 | 2020-12-18 | 上海空间电源研究所 | Laser load distributor current-limiting control circuit for space |
| CN110854815A (en) * | 2019-10-08 | 2020-02-28 | 许继电源有限公司 | Short-circuit protection circuit of switching power supply |
| CN113363932B (en) * | 2021-06-07 | 2022-06-21 | 山东建筑大学 | Series short-circuit fault detection and protection circuit based on electrolytic capacitor |
| CN113422352B (en) * | 2021-06-07 | 2022-06-21 | 山东建筑大学 | Strong-current switch circuit capable of automatically detecting short-circuit fault |
| CN115453939B (en) * | 2022-09-15 | 2023-09-15 | 珠海东之尼电子科技有限公司 | Protection circuit, control system and rinsing machine |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1633743A (en) * | 2002-02-14 | 2005-06-29 | 皇家飞利浦电子股份有限公司 | Noise reduction in a power converter |
| CN1781239A (en) * | 2004-02-17 | 2006-05-31 | 半导体元件工业有限责任公司 | Low noise power supply method and controller therefor |
| CN101465245A (en) * | 2008-12-19 | 2009-06-24 | 上海电器科学研究所（集团）有限公司 | Device for preventing false action of low-voltage apparatus implement device |
| CN102368663A (en) * | 2011-06-22 | 2012-03-07 | 广州金升阳科技有限公司 | Power supply converter with controllable current peak inhibition protection |
| CN203932980U (en) * | 2014-06-30 | 2014-11-05 | 中国电子科技集团公司第四十三研究所 | The power source short-circuit protection system with autoboot and soft start function |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6813170B2 (en) * | 2002-08-19 | 2004-11-02 | Semtech Corporation | Multiple output power supply having soft start protection for load over-current or short circuit conditions |
| TWI429335B (en) * | 2005-03-29 | 2014-03-01 | Rohm Co Ltd | Discharge device and integrated circuit device for specical purpose |
-
2014
- 2014-06-30 CN CN201410300386.8A patent/CN104022489B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1633743A (en) * | 2002-02-14 | 2005-06-29 | 皇家飞利浦电子股份有限公司 | Noise reduction in a power converter |
| CN1781239A (en) * | 2004-02-17 | 2006-05-31 | 半导体元件工业有限责任公司 | Low noise power supply method and controller therefor |
| CN101465245A (en) * | 2008-12-19 | 2009-06-24 | 上海电器科学研究所（集团）有限公司 | Device for preventing false action of low-voltage apparatus implement device |
| CN102368663A (en) * | 2011-06-22 | 2012-03-07 | 广州金升阳科技有限公司 | Power supply converter with controllable current peak inhibition protection |
| CN203932980U (en) * | 2014-06-30 | 2014-11-05 | 中国电子科技集团公司第四十三研究所 | The power source short-circuit protection system with autoboot and soft start function |
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