CN2879525Y - Module electric power short protection device - Google Patents
Module electric power short protection device Download PDFInfo
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- CN2879525Y CN2879525Y CN 200520145334 CN200520145334U CN2879525Y CN 2879525 Y CN2879525 Y CN 2879525Y CN 200520145334 CN200520145334 CN 200520145334 CN 200520145334 U CN200520145334 U CN 200520145334U CN 2879525 Y CN2879525 Y CN 2879525Y
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- resistance
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- diode
- power supply
- triode
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Abstract
The present utility model provides a module electric power short-circuit protection device used in a module electrical source adopting a current type PWM 3843 or 3842, wherein the feedback voltage input terminal of a controller is connected to an optical coupler and to an output terminal of an inner error amplifier which output terminal is connected to a stabilivolt tube and a diode having anodes facing to each other; the benchmark voltage output terminal is connected to an emitter of a triode which basal pole is connected to a cathode of the diode through a first resistor and a second resistor which are connected in serial, in which the common terminal of the second resistor and the diode are grounded through a third resistor and a capacitor is connected between the common terminal of the first resistor and the second resistor and the ground. The present module electric power short-circuit protection device having a simple circuit structure and a low cost doesn't has rigorous requests for periphery parts and apparatus of a chip and is easy to debug, and then is suitable for a variety of power levels and topological structures.
Description
Technical field
The utility model relates to a kind of short-circuit protection that is used for modular power source, belongs to the switch power technology field.
Background technology
Current, Switching Power Supply has obtained extensive use with advantages such as its high efficiency, small sizes.All use Switching Power Supply in a large number in communications fields such as switching equipment, access device, mobile communication, microwave communication and optical transmission, routers.Along with continuous advancement in technology, Switching Power Supply develops to modular direction day by day.Adopt modular power source to set up power-supply system and have short, characteristics such as reliability is high, system upgrade is easy of design cycle.Along with a large amount of uses of semiconductor technology, encapsulation technology and high-frequency soft switch technology, the conversion efficiency of modular power source is more and more higher, uses also more and more widely.
Existing modular power source generally adopts PWM (pulse-width modulation) technology.3843 as popular current mode pwm signal generator, has advantages such as precision height, voltage is stable, peripheral circuit is simple, cheap, is widely used in the various modular power sources.At present; module power supply short-circuit protective scheme at 3843 chips adopts " beat and cough up " formula (hiccup) protection more; when promptly the voltage of delivering to 3843 3 pin when the current sampling signal of power supply is higher than 1V; overcurrent protection is action just; reduce the output duty cycle of 6 pin, 3843 supply power voltage also and then descended, when low when 3843 can not work; entire circuit is closed, and begins next time start-up course by starting resistance then.Under this protected mode, power supply several switch periods of only working just enter start-up course for a long time then, so average power consumption are low, even long-time output short-circuit also can not cause the cause thermal damage of power supply.
But also there is fairly obvious shortcoming in this protected mode: be only applicable to small-power flyback power supply circuit; High input at line voltage is protected inefficacy easily; Tolerance height to the chip periphery device, the ability that adapts to ambient temperature, also undesirable to big capacitive load load capacity, the setting of switching frequency and the selection of MOSFET pipe all there are harsh requirement, higher fraction defective appears in large batch of production easily.
Summary of the invention
The purpose of this utility model is the deficiency at existing module power supply short-circuit protective mode; a kind of new module power supply short-circuit protective device is provided; this device adopts circuit design scheme simply cleverly, efficiently solves the module power supply short-circuit protective problem under the varying environment.
For realizing above-mentioned utility model purpose, the utility model adopts following technical scheme:
A kind of module power supply short-circuit protective device; be used for adopting the modular power source of current mode PWM controller; wherein the current sense end of this controller serial connection is used for the resistance of current sampling; regularly terminate at the common port of timing capacitor and timing resistor; power end is accepted the input of external power source, it is characterized in that:
The feedback voltage input of described controller connects an optocoupler, and this input is connected with the output of internal error amplifier;
Output at described internal error amplifier connects a voltage-stabiliser tube and a diode, and the anode of described voltage-stabiliser tube and diode is relative;
Reference voltage output end inserts the emitter-base bandgap grading of triode, the base stage of described triode is connected the negative electrode of described diode with second resistance by first resistance of series connection, the common port of described second resistance and described diode is by the 3rd grounding through resistance, is connected to an electric capacity between the common port of described first resistance and second resistance and ground;
The collector electrode of described triode is connected with described timing resistor.
Described PWM controller is 3843 or 3842.
Described feedback voltage input is connected with the output of electric capacity with described internal error amplifier by parallel resistor.
Described triode is the positive-negative-positive triode.
Module power supply short-circuit protective device circuit provided by the utility model is simple in structure, with low cost, and is not high to the chip periphery requirement on devices, and debugging easily, is fit to various power grades and topological structure.This short-circuit protection can make modular power source long-time short circuit under the situation of completely planting, and can recover automatically after short circuit disappears.
Description of drawings
Below in conjunction with the drawings and specific embodiments the utility model is further described.
Fig. 1 is the circuit theory diagrams of module power supply short-circuit protective device provided by the utility model.
Embodiment
The 3843rd, a kind of popular current mode pwm signal generator.It comprises unit such as error amplifier, PWM comparator, PWM latch, oscillator, internal reference power supply and under-voltage locking.Each pin function of this PWM chip is as follows:
1 pin COMP is the output of internal error amplifier, is connected to feedback network between this pin and 2 pin usually, to determine the gain and the frequency response of error amplifier.
2 pin Vfb are feedback voltage inputs, and this pin and internal error the amplifier reference voltage of input in the same way (are generally+2.5V) compare, produce control voltage, the width of control impuls.
3 pin Isense are current sense ends.The front is mentioned, and existing short-circuit protection mode at the sample resistance of the little resistance of source electrode serial connection of power switch pipe V1, becomes voltage with the current conversion of pulse transformer normally in peripheral circuit, and this voltage is sent into 3 pin, the control pulsewidth.In addition, when supply voltage was unusual, the electric current of power switch pipe increased, and when the voltage on the sample resistance surpassed 1V, UC3843 just stopped output, has protected power switch pipe effectively.
4 pin Rt/Ct are regularly ends, the common port of its external timing capacitor and timing resistor.
5 pin GND ground connection.
6 pin OUT are outputs, and this pin is the output of figure Teng pillar, and driving force is ± 1A.This totem structure is favourable to the shutoff of driven power tube.
7 pin Vcc are power ends.When supply power voltage be lower than+during 16V, UC3843 does not work, power consumption this moment is below 1mA.Input voltage can obtain from the high pressure step-down by a big resistance resistance.Behind the chip operation, input voltage can be+10～+ fluctuate between the 30V, be lower than+10V quits work.Power consumption is about 15mA during work, and this electric current can provide by feedback resistance.
8 pin Vref are reference voltage output ends, exportable accurate+the 5V reference voltage, electric current can reach 50mA.
In the modular power source of existing employing 3843, all similar about the connected mode of 3,4,5,6,7 pins, wherein 3 pin serial connection is used for the resistance of current sampling, 4 pin are connected on the common port of timing capacitor and timing resistor, 5 pin ground connection, 6 pin are externally exported, and 7 pin are accepted the input of external power source.
Module power supply short-circuit protective device provided by the utility model mainly designs at the modular power source that adopts 3843.The circuit that this short-circuit protection carried out improves main shown in the frame of broken lines among Fig. 1, is connected optocoupler N1 at 2 pin places with R8 by resistance R 23; At 1 pin place, connect a voltage stabilizing didoe V9 and a general-purpose diode V16 in regular turn, the anode of V9 and V16 is relative, and 2 pin are connected with 1 pin with capacitor C 17 by parallel resistor R7.8 pin insert the emitter-base bandgap grading of a positive-negative-positive triode V17.The base stage of this triode V17 connects resistance R 10, and R10 is by the negative electrode of resistance R 48 connection diode V16, and their common port is by resistance R 47 ground connection.Between the common port of resistance R 10 and R48 and ground, be connected to capacitor C 9.The collector electrode of triode V17 is connected with timing resistor R11, and 4 pin are connected on the common port of R11 and timing capacitor C24.
The operation principle of this short-circuit protection is such: when output short-circuit; output voltage drops to 0 volt; the voltage of other winding induction of transformer (not shown) is corresponding also reduces to 0 volt; at this moment present high-impedance state between the CE of optocoupler N1; 3843 2 pin level descend less than after 2.5 volts; 1 pin level raises, and makes voltage-stabiliser tube V9 puncture conducting, and electric current is by diode V16; resistance R 48 gives capacitor C 9 chargings; capacitor C 9 voltages are risen, and the base current of triode V17 reduces simultaneously, and base voltage rises; when surpassing 4.3 volts; V17 ends, and this moment, oscillating circuit was turned off, and then turn-offs output.
The utility model is not only applicable to adopt 3843 modular power source, can provide short-circuit protection to adopting other current modes PWM controller too as the modular power source of 3842 grades.
Though above described the utility model by embodiment, those of ordinary skills know, the utility model has many distortion and variation and does not break away from spirit of the present utility model, appended claim will comprise these distortion and variation.
Claims (5)
1. module power supply short-circuit protective device; be used for adopting the modular power source of current mode PWM controller; wherein the current sense end of this controller serial connection is used for the resistance of current sampling; regularly terminate at the common port of timing capacitor and timing resistor; power end is accepted the input of external power source, it is characterized in that:
The feedback voltage input of described controller connects an optocoupler, and this input is connected with the output of internal error amplifier;
Output at described internal error amplifier connects a voltage-stabiliser tube and a diode, and the anode of described voltage-stabiliser tube and diode is relative;
Reference voltage output end inserts the emitter-base bandgap grading of triode, the base stage of described triode is connected the negative electrode of described diode with second resistance by first resistance of series connection, the common port of described second resistance and described diode is by the 3rd grounding through resistance, is connected to an electric capacity between the common port of described first resistance and second resistance and ground;
The collector electrode of described triode is connected with described timing resistor.
2. module power supply short-circuit protective device as claimed in claim 1 is characterized in that:
Described PWM controller is 3843.
3. module power supply short-circuit protective device as claimed in claim 1 is characterized in that:
Described PWM controller is 3842.
4. module power supply short-circuit protective device as claimed in claim 1 is characterized in that:
Described feedback voltage input is connected with the output of electric capacity with described internal error amplifier by parallel resistor.
5. module power supply short-circuit protective device as claimed in claim 1 is characterized in that:
Described triode is the positive-negative-positive triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520145334 CN2879525Y (en) | 2005-12-21 | 2005-12-21 | Module electric power short protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520145334 CN2879525Y (en) | 2005-12-21 | 2005-12-21 | Module electric power short protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2879525Y true CN2879525Y (en) | 2007-03-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520145334 Expired - Fee Related CN2879525Y (en) | 2005-12-21 | 2005-12-21 | Module electric power short protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2879525Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101582639B (en) * | 2008-05-16 | 2011-06-15 | 群康科技(深圳)有限公司 | Switch power supply circuit |
| CN102916420A (en) * | 2012-11-09 | 2013-02-06 | 深圳市安科讯实业有限公司 | Circuit for preventing PWM chip from error protection |
| CN103683204A (en) * | 2012-09-26 | 2014-03-26 | 深圳市海洋王照明工程有限公司 | Switching power supply over-current protection circuit |
-
2005
- 2005-12-21 CN CN 200520145334 patent/CN2879525Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101582639B (en) * | 2008-05-16 | 2011-06-15 | 群康科技(深圳)有限公司 | Switch power supply circuit |
| CN103683204A (en) * | 2012-09-26 | 2014-03-26 | 深圳市海洋王照明工程有限公司 | Switching power supply over-current protection circuit |
| CN102916420A (en) * | 2012-11-09 | 2013-02-06 | 深圳市安科讯实业有限公司 | Circuit for preventing PWM chip from error protection |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: TONLIER ENERGY TECHNOLOGY (BEIJING) CO., LTD. Free format text: FORMER OWNER: BEIJING TONGLIHUAN ELECTRICAL CO., LTD. Effective date: 20101202 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 101100 NO.1, FURONG WEST ROAD, DONGGUAN, TONGZHOU DISTRICT, BEIJING TO: 101111 NO.9, KECHUANG STREET 14, BEIJING ECONOMIC AND TECHNOLOGICAL DEVELOPMENT ZONE, BEIJING |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20101202 Address after: Branch of Beijing economic and Technological Development Zone of Beijing City, No. 9 14 street 101111 Patentee after: Tonlier Energy Technology(Beijing)Co.,Ltd. Address before: 101100, No. 1 Furong West Road, Dongguan, Beijing, Tongzhou District Patentee before: Beijing Tonglihuan Electrical Co., Ltd. |
|
| C56 | Change in the name or address of the patentee |
Owner name: BEIJING TONLIER ENERGY TECHNOLOGY CO., LTD. Free format text: FORMER NAME: TONLIER ENERGY TECHNOLOGY (BEIJING) CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: Branch of Beijing economic and Technological Development Zone of Beijing City, No. 9 14 street 101111 Patentee after: Beijing Tonlier Energy-saving LLC. Address before: Branch of Beijing economic and Technological Development Zone of Beijing City, No. 9 14 street 101111 Patentee before: Tonlier Energy Technology(Beijing)Co.,Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070314 Termination date: 20141221 |
|
| EXPY | Termination of patent right or utility model |