CN104022489A - Power supply short circuit protection system with automatic restarting and soft-starting functions and protection method - Google Patents
Power supply short circuit protection system with automatic restarting and soft-starting functions and protection method Download PDFInfo
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- CN104022489A CN104022489A CN201410300386.8A CN201410300386A CN104022489A CN 104022489 A CN104022489 A CN 104022489A CN 201410300386 A CN201410300386 A CN 201410300386A CN 104022489 A CN104022489 A CN 104022489A
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Abstract
The invention provides a power supply short circuit protection system with automatic restarting and soft-starting functions and a protection method of the power supply short circuit protection system. The system comprises a PWM (Pulse Width Modulation) controller, a power supply circuit, a soft starting circuit and a short circuit protection circuit. The invention further provides the protection method of the power supply short circuit protection system with automatic restarting and soft-starting functions. According to the system, the automatic restarting of the power supply circuit and the automatic setting of the soft starting circuit are realized by utilizing the short circuit protection circuit, so that the phenomenon that short circuit protection circuit cannot return to normal because being triggered to enter a protection state again due to the inputting of surge currents after the short circuit protection is finished is effectively prevented. Thus, compared with the conventional hiccup-type short circuit protection circuit with the soft-starting function, the short circuit protection circuit provided by the invention has the large capacitive load capacity because the surge currents which are input are effectively inhibited, so that the short circuit protection circuit provided by the invention is suitable for various power supply systems.
Description
Technical field
The present invention relates to power source short-circuit protection technical field, specifically a kind of power source short-circuit protection system and method with autoboot and soft start function.
Background technology
Short circuit protection system is the core protected location in power-supply system, and its effect is the short-circuit protection state detecting in power-supply system, and power supply is controlled to the excessive damage that causes power-supply system of electric current while preventing short circuit.Have in the normal power supplies short circuit protection system of soft start function; soft starting circuit only can effectively prevent the overshoot of input current when power initiation; when short-circuit condition appears in power output end; short circuit protection system is realized short-circuit protection; after short-circuit condition exits; during power output end voltage returns to normal value; input current overshoot during the overswing ratio power initiation of input current is large; when especially power supply capacitive load is larger; easily trigger short circuit protection system and again enter guard mode, cause short-circuit protection misoperation.
Summary of the invention
The object of the present invention is to provide a kind of power source short-circuit protection system and method with autoboot and soft start function, the input current overshoot during reducing short circuit and after short-circuit condition disappearance, avoids occurring short-circuit protection misoperation.
Technical scheme of the present invention is:
A kind of power source short-circuit protection system with autoboot and soft start function, comprise the PWM controller being connected with main power circuit, described main power circuit consists of metal-oxide-semiconductor, transformer and sampling resistor, the output of described PWM controller connects the grid of metal-oxide-semiconductor, the source electrode of described metal-oxide-semiconductor is by sampling resistor ground connection, its drain electrode is connected to power input voltage by transformer primary side winding, also comprises power supply circuits, soft starting circuit and short-circuit protection circuit;
Described power supply circuits, for output voltage is provided, are PWM controller, soft starting circuit and short-circuit protection circuit power supply;
Described soft starting circuit, for receiving the voltage of power supply circuits, produces soft-start signal to open the output of PWM controller, and power supply is started working;
Described short-circuit protection circuit, for after it powers on, if power output end detected, there is short circuit, close PWM controller output so that power supply quit work, discharge electric charge that soft starting circuit absorbs so that it enters holding state simultaneously, and drag down power supply circuits output voltage so that its cannot power; After its lower electricity, power supply circuits restore electricity, and soft starting circuit is opened the output of PWM controller again, and power supply is started working; If power output end short circuit detected, disappear, make power supply keep normal operating conditions, if still short circuit of power output end detected, repeat above-mentioned action, until short-circuit condition disappears.
The described power source short-circuit protection system with autoboot and soft start function, described power supply circuits consist of the first voltage stabilizing didoe and the first current-limiting resistance, the plus earth of described the first voltage stabilizing didoe, its negative electrode is connected to power input voltage by the first current-limiting resistance; The power end of described PWM controller is connected to the node between the first voltage stabilizing didoe and the first current-limiting resistance;
Described soft starting circuit comprises RCD absorbing circuit and PNP triode, described RCD absorbing circuit consists of resistance, electric capacity and diode, one end ground connection of described electric capacity, its other end by and the resistance and the diode that connect be connected to the node between the first voltage stabilizing didoe and the first current-limiting resistance; Described resistance, electric capacity are connected with the base stage of PNP triode with the node between diode three, and the emitter of described PNP triode connects the feedback end of PWM controller, its grounded collector;
Described short-circuit protection circuit comprises comparator, a NPN triode, the 2nd NPN triode and the 3rd NPN triode; The power end of described comparator is connected to the node between the first voltage stabilizing didoe and the first current-limiting resistance, its in-phase input end is connected to the node between metal-oxide-semiconductor and sampling resistor, its inverting input is connected to the node between the second voltage stabilizing didoe and the second current-limiting resistance, described the second voltage stabilizing didoe and the second current-limiting resistance form reference voltage circuit, the plus earth of described the second voltage stabilizing didoe, its negative electrode is connected to power input voltage by the second current-limiting resistance;
The output of described comparator is connected with the base stage of the 3rd NPN triode with a NPN triode, the 2nd NPN triode respectively; The equal ground connection of emitter of a described NPN triode, the 2nd NPN triode and the 3rd NPN triode; The collector electrode of a described NPN triode is connected to the node between PNP triode and PWM controller, the collector electrode of the 2nd NPN triode is connected to the node between resistance, electric capacity and diode three, and the collector electrode of the 3rd NPN triode is connected to the node between the first voltage stabilizing didoe and the first current-limiting resistance.
Described a kind of guard method with the power source short-circuit protection system of autoboot and soft start function, comprises the following steps:
(1) power supply circuits provide output voltage, are PWM controller, soft starting circuit and short-circuit protection circuit power supply, and PWM controller, soft starting circuit and short-circuit protection circuit power on;
(2) after soft starting circuit powers on, produce soft-start signal to open the output of PWM controller, power supply is started working;
(3) after short-circuit protection circuit powers on, detect power output end and whether occur short circuit, if so, perform step (4), if not, power supply keeps normal operating conditions;
(4) short-circuit protection circuit is closed the output of PWM controller so that power supply quits work, and discharges electric charge that soft starting circuit absorbs so that it enters holding state simultaneously, and drag down power supply circuits output voltage so that its cannot power; Under short-circuit protection circuit, after electricity, power supply circuits restore electricity, and soft starting circuit is opened the output of PWM controller again, and power supply is started working, and return to step (3).
The present invention realizes power supply circuits autoboot by short-circuit protection circuit and soft starting circuit is reset automatically; can effectively prevent that the inrush current triggering short-circuit protection circuit after short-circuit protection finishes from again entering guard mode and cannot recover normal; because inrush current is effectively suppressed; the formula of the having the hiccups short-circuit protection circuit that can have a soft start function than routine has larger capacitance load capability, is applicable to various power-supply systems.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of the specific embodiment of the invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, further illustrate the present invention.
As shown in Figure 1, a kind of power source short-circuit protection system with autoboot and soft start function, comprises PWM controller 2, power supply circuits 3, soft starting circuit 4, reference voltage circuit 5 and short-circuit protection circuit 6.PWM controller 2 is connected with the main power circuit 1 of power supply, main power circuit 1 consists of NMOS pipe Q0, transformer T and sampling resistor R0, the grid of NMOS pipe Q0 connects the output of PWM controller, the source electrode of NMOS pipe Q0 is by sampling resistor R0 ground connection, and the drain electrode of NMOS pipe Q0 is connected to power input voltage Vin by the former limit winding of transformer T.
Power supply circuits 3 consist of the first voltage stabilizing didoe Dz1 and the first current-limiting resistance R1, the plus earth of the first voltage stabilizing didoe Dz1, and the negative electrode of the first voltage stabilizing didoe Dz1 is connected to power input voltage Vin by the first current-limiting resistance R1.The power end of PWM controller 2 is connected to the node between the first voltage stabilizing didoe Dz1 and the first current-limiting resistance R1.
Soft starting circuit 4 comprises RCD absorbing circuit and PNP triode Q, RCD absorbing circuit consists of resistance R, capacitor C and diode D, one end ground connection of capacitor C, the other end of capacitor C by and the resistance R and the diode D that connect be connected to the node between the first voltage stabilizing didoe Dz1 and the first current-limiting resistance R1.Resistance R, capacitor C are connected with the base stage of PNP triode Q with the node between diode D three, and the emitter of PNP triode Q connects the feedback end of PWM controller 2, the grounded collector of PNP triode Q.
Reference voltage circuit 5 consists of the second voltage stabilizing didoe Dz2 and the second current-limiting resistance R2, the plus earth of the second voltage stabilizing didoe Dz2, and the negative electrode of the second voltage stabilizing didoe Dz2 is connected to power input voltage Vin by the second current-limiting resistance R2.
Short-circuit protection circuit 6 comprises comparator V, a NPN triode Q1, the 2nd NPN triode Q2 and the 3rd NPN triode Q3.The power end of comparator V is connected to the node between the first voltage stabilizing didoe Dz1 and the first current-limiting resistance R1, the in-phase input end of comparator V is connected to the node between NMOS pipe Q0 and sampling resistor R0, and the inverting input of comparator V is connected to the node between the second voltage stabilizing didoe Dz2 and the second current-limiting resistance R2.
The output of comparator V is connected with the base stage of the 3rd NPN triode Q3 with the base stage of a NPN triode Q1, the base stage of the 2nd NPN triode Q2 respectively.The equal ground connection of emitter of the emitter of the emitter of the one NPN triode Q1, the 2nd NPN triode Q2 and the 3rd NPN triode Q3.The collector electrode of the one NPN triode Q1 is connected to the node between PNP triode Q and PWM controller 2, the collector electrode of the 2nd NPN triode Q2 is connected to the node between resistance R, capacitor C and diode D three, and the collector electrode of the 3rd NPN triode Q3 is connected to the node between the first voltage stabilizing didoe Dz1 and the first current-limiting resistance R1.
Operation principle of the present invention:
Power input voltage Vin, after transformer T conversion, then passes through rectifying and wave-filtering, output dc voltage Vo.Under normal condition, the supply power voltage of the first voltage stabilizing didoe Dz1 is set up, and PWM controller 2, comparator V power on, meanwhile, the voltage of capacitor C rises, and the emitter voltage of PNP triode Q rises, when it rises to certain phase, PWM controller 2 output pwm signals, power supply starts steady operation.When there is short-circuit condition in power output end, the in-phase input end voltage of comparator V is higher than the reference voltage of negative-phase input, comparator V exports high level, the one NPN triode Q1 drags down the feedback end voltage of PWM controller 2, thereby close pwm signal output, the 2nd NPN triode Q2 discharges the electric charge in capacitor C, and soft starting circuit 4 can be acted on when start next time, the 3rd NPN triode Q3 drags down the voltage of the first voltage stabilizing didoe Dz1, makes electricity under PWM controller 2 and comparator V.Now, due to electricity under comparator V, comparator V does not work, its output no signal, a uncontrollable NPN triode Q1, the 2nd NPN triode Q2 and the 3rd NPN triode Q3 action, the first voltage stabilizing didoe Dz1 starts to recover normal power supply, and PWM controller 2 and comparator V power on, simultaneously, the voltage of capacitor C rises, and the emitter voltage of PNP triode Q rises, when it rises to certain phase, PWM controller 2 output pwm signals, power supply is started working.If now the short-circuit condition of power output end disappears, power supply keeps normal operating conditions, if now still in short-circuit condition, short-circuit protection circuit 6 carries out above-mentioned action again, until the short-circuit condition of power output end disappears.
The above execution mode is only that the preferred embodiment of the present invention is described; not scope of the present invention is limited; design under the prerequisite of spirit not departing from the present invention; various distortion and improvement that those of ordinary skills make technical scheme of the present invention, all should fall in the definite protection range of claims of the present invention.
Claims (3)
1. a power source short-circuit protection system with autoboot and soft start function, comprise the PWM controller being connected with main power circuit, described main power circuit consists of metal-oxide-semiconductor, transformer and sampling resistor, the output of described PWM controller connects the grid of metal-oxide-semiconductor, the source electrode of described metal-oxide-semiconductor is by sampling resistor ground connection, its drain electrode is connected to power input voltage by transformer primary side winding, it is characterized in that: also comprise power supply circuits, soft starting circuit and short-circuit protection circuit;
Described power supply circuits, for output voltage is provided, are PWM controller, soft starting circuit and short-circuit protection circuit power supply;
Described soft starting circuit, for receiving the voltage of power supply circuits, produces soft-start signal to open the output of PWM controller, and power supply is started working;
Described short-circuit protection circuit, for after it powers on, if power output end detected, there is short circuit, close PWM controller output so that power supply quit work, discharge electric charge that soft starting circuit absorbs so that soft starting circuit enters holding state simultaneously, and drag down power supply circuits output voltage so that power supply circuits cannot power; Under short-circuit protection circuit, after electricity, power supply circuits restore electricity, and soft starting circuit is opened the output of PWM controller again, and power supply is started working; If power output end short circuit detected, disappear, make power supply keep normal operating conditions, if still short circuit of power output end detected, repeat above-mentioned action, until short-circuit condition disappears.
2. the power source short-circuit protection system with autoboot and soft start function according to claim 1, it is characterized in that: described power supply circuits consist of the first voltage stabilizing didoe and the first current-limiting resistance, the plus earth of described the first voltage stabilizing didoe, its negative electrode is connected to power input voltage by the first current-limiting resistance; The power end of described PWM controller is connected to the node between the first voltage stabilizing didoe and the first current-limiting resistance;
Described soft starting circuit comprises RCD absorbing circuit and PNP triode, described RCD absorbing circuit consists of resistance, electric capacity and diode, one end ground connection of described electric capacity, its other end by and the resistance and the diode that connect be connected to the node between the first voltage stabilizing didoe and the first current-limiting resistance; Described resistance, electric capacity are connected with the base stage of PNP triode with the node between diode three, and the emitter of described PNP triode connects the feedback end of PWM controller, its grounded collector;
Described short-circuit protection circuit comprises comparator, a NPN triode, the 2nd NPN triode and the 3rd NPN triode; The power end of described comparator is connected to the node between the first voltage stabilizing didoe and the first current-limiting resistance, its in-phase input end is connected to the node between metal-oxide-semiconductor and sampling resistor, its inverting input is connected to the node between the second voltage stabilizing didoe and the second current-limiting resistance, described the second voltage stabilizing didoe and the second current-limiting resistance form reference voltage circuit, the plus earth of described the second voltage stabilizing didoe, its negative electrode is connected to power input voltage by the second current-limiting resistance;
The output of described comparator is connected with the base stage of the 3rd NPN triode with a NPN triode, the 2nd NPN triode respectively; The equal ground connection of emitter of a described NPN triode, the 2nd NPN triode and the 3rd NPN triode; The collector electrode of a described NPN triode is connected to the node between PNP triode and PWM controller, the collector electrode of the 2nd NPN triode is connected to the node between resistance, electric capacity and diode three, and the collector electrode of the 3rd NPN triode is connected to the node between the first voltage stabilizing didoe and the first current-limiting resistance.
3. a kind of guard method with the power source short-circuit protection system of autoboot and soft start function according to claim 1, is characterized in that, comprises the following steps:
(1) power supply circuits provide output voltage, are PWM controller, soft starting circuit and short-circuit protection circuit power supply, and PWM controller, soft starting circuit and short-circuit protection circuit power on;
(2) after soft starting circuit powers on, produce soft-start signal to open the output of PWM controller, power supply is started working;
(3) after short-circuit protection circuit powers on, detect power output end and whether occur short circuit, if so, perform step (4), if not, power supply keeps normal operating conditions;
(4) short-circuit protection circuit is closed the output of PWM controller so that power supply quits work, and discharges electric charge that soft starting circuit absorbs so that it enters holding state simultaneously, and drag down power supply circuits output voltage so that its cannot power; Under short-circuit protection circuit, after electricity, power supply circuits restore electricity, and soft starting circuit is opened the output of PWM controller again, and power supply is started working, and return to step (3).
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| 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 |
| CN108418404A (en) * | 2018-03-29 | 2018-08-17 | 深圳茂硕电子科技有限公司 | It is a kind of to enter the controllable circuit of interval point and its method |
| CN109067161A (en) * | 2018-08-09 | 2018-12-21 | 中国铁道科学研究院集团有限公司 | A kind of power safety activation system |
| CN110545031A (en) * | 2019-07-26 | 2019-12-06 | 上海空间电源研究所 | Laser load distributor current-limiting control circuit for space |
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| CN113363932A (en) * | 2021-06-07 | 2021-09-07 | 山东建筑大学 | Series short-circuit fault detection and protection circuit based on electrolytic capacitor |
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| CN115453939A (en) * | 2022-09-15 | 2022-12-09 | 珠海东之尼电子科技有限公司 | Protection circuit, control system and rinsing machine |
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| CN113363932A (en) * | 2021-06-07 | 2021-09-07 | 山东建筑大学 | Series short-circuit fault detection and protection circuit based on electrolytic capacitor |
| CN113422352A (en) * | 2021-06-07 | 2021-09-21 | 山东建筑大学 | Strong-current switch circuit capable of automatically detecting short-circuit fault |
| 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 |
| 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 |
| CN115453939A (en) * | 2022-09-15 | 2022-12-09 | 珠海东之尼电子科技有限公司 | Protection circuit, control system and rinsing machine |
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