CN203368331U - Switch power supply with input under-voltage protection function - Google Patents
Switch power supply with input under-voltage protection function Download PDFInfo
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- CN203368331U CN203368331U CN 201320360417 CN201320360417U CN203368331U CN 203368331 U CN203368331 U CN 203368331U CN 201320360417 CN201320360417 CN 201320360417 CN 201320360417 U CN201320360417 U CN 201320360417U CN 203368331 U CN203368331 U CN 203368331U
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Abstract
The utility model discloses a switch power supply with an input under-voltage protection function The witch power supply comprises a positive pole power supply bus, a negative pole power supply bus and a transformer. One end of a primary winding of the transformer is connected with the positive pole power supply bus, and the other end of the primary winding of the transformer is connected with the negative pole power supply bus through an MOS tube. A control pole of the MOS tube is connected with a PWM drive control circuit. A secondary winding of the transformer supplies power to a load through an output rectification circuit. The witch power supply further comprises an input under-voltage protection circuit. A signal acquisition end of the input under-voltage protection circuit is connected with the positive pole power supply bus and the negative pole power supply bus and is used for collecting an input voltage. An output end of the input under-voltage protection circuit is connected with an enable port of the PWM drive control circuit and is used for sending an output disable instruction to the PWM drive control circuit when the input voltage is lower than a preset voltage. The switch power supply is capable of realizing the quick-response reliable-performance under-voltage protection, has the advantages of very few protection circuit components, simple circuit and convenient installation, and is capable of solving the problem that the space of a PCB is too small to accommodate more components.
Description
Technical field
The utility model relates to Switching Power Supply, relates in particular to a kind of Switching Power Supply of tape input under-voltage protection.
Background technology
Existing big-and-middle-sized power power-supply product; while as need, loading the input undervoltage defencive function; generally can consider to use discharge circuit; be that front stage circuits is carried out input signal detection; rear class just by amplifier, will input the next signal of detection and default benchmark compares; judge whether powered-down output with comparative result, realize by this input undervoltage defencive function.But the discharge circuit cost is higher; in product below 100W power; General Requirements is simplified circuit to reduce costs as far as possible; so above-mentioned said input undervoltage protection circuit just should not be used in small-power power; increased first the cost of complete machine power supply; second the layout designs in the time of also can having influence on the PCB design, unsuitable miniaturization.
The utility model content
The utility model is to solve the higher defect of prior art cost, for small-power power, proposes a kind of quick response, the input undervoltage protection scheme of very low cost.
For solving the problems of the technologies described above, the technical scheme the utility model proposes is the Switching Power Supply of a kind of tape input under-voltage protection of design, comprise anodal power supply buses, the negative pole power supply buses, transformer, the anodal power supply buses of armature winding one termination of this transformer, the other end connects the negative pole power supply buses by metal-oxide-semiconductor, the control utmost point of metal-oxide-semiconductor connects the output of PWM Drive and Control Circuit, the secondary winding of described transformer provides direct current by output rectification circuit to load, it also comprises input undervoltage protection circuit, the signals collecting end of input undervoltage protection circuit connects anodal power supply buses and negative pole power supply buses, in order to Gather and input voltage, the output of input undervoltage protection circuit connects the Enable Pin of PWM Drive and Control Circuit, in order at input voltage, to send and to forbid output order to the PWM Drive and Control Circuit during lower than predeterminated voltage.
Described input undervoltage protection circuit comprises: the first to the 9th resistance, the first electric capacity, the first to the 3rd triode and voltage stabilizing didoe, the anodal power supply buses of a termination of the first resistance wherein, another termination second of the first resistance and an end of the 6th resistance, another termination the 9th resistance of the second resistance, the first electric capacity, the 3rd resistance, one end of the 4th resistance and the negative electrode of voltage stabilizing didoe, the collector electrode of another termination the 3rd triode of the 9th resistance, the base stage of the 3rd triode connects an end of the 8th resistance, the anode of voltage stabilizing didoe connects the base stage of an end and first triode of the 5th resistance, an end of another termination the 7th resistance of the 6th resistance, the collector electrode of the other end of the 8th resistance and the first triode, the base stage of another termination the second triode of the 7th resistance, the emitter of the 3rd triode, the other end of the first electric capacity, the other end of the 3rd resistance, the other end of the 4th resistance, the other end of the 5th resistance, the emitter of the first triode, connect the negative pole power supply buses after the emitter short circuit of the second triode, the collector electrode of the second triode sends the described output order of forbidding.
The two ends of the armature winding of described transformer connect the RCD snubber circuit.
The output of described output rectification circuit connects the output voltage feedback circuit, the output voltage that the output voltage feedback circuit collects to PWM Drive and Control Circuit feedback by optical coupling isolation device.
Described anodal power supply buses is connected civil power by input rectification circuit with input filter circuit with the negative pole power supply buses.
Described transformer also comprises a power supply winding, the described negative pole power supply buses of one termination, and its other end connects the power end of PWM Drive and Control Circuit by the first diode, and the power end of PWM Drive and Control Circuit connects described anodal power supply buses by the tenth resistance.
Compared with prior art, the utility model can be realized the under-voltage protection of quick response, dependable performance, has protective circuit components and parts few simultaneously, and circuit is simple, cheap advantage of installing; And can solve because the PCB space is little and can not place the more problem of multicomponent device.
The accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is described in detail, wherein:
The theory diagram that Fig. 1 is the utility model preferred embodiment;
The circuit diagram that Fig. 2 is the utility model preferred embodiment.
Embodiment
The utility model has disclosed a kind of Switching Power Supply of tape input under-voltage protection, comprise anodal power supply buses, the negative pole power supply buses, transformer T1, the anodal power supply buses BULK of armature winding one termination of this transformer, the other end meets negative pole power supply buses PGND by metal-oxide-semiconductor Q4, the control utmost point of metal-oxide-semiconductor connects the output of PWM Drive and Control Circuit, the secondary winding of described transformer provides direct current by output rectification circuit to load, it also comprises input undervoltage protection circuit, the signals collecting end of input undervoltage protection circuit connects anodal power supply buses and negative pole power supply buses, in order to Gather and input voltage, the output of input undervoltage protection circuit connects the Enable Pin of PWM Drive and Control Circuit.When input voltage, higher than predeterminated voltage, input undervoltage protection circuit is to the Enable Pin EN output services instruction of PWM Drive and Control Circuit, and the PWM Drive and Control Circuit is sent control impuls to the control utmost point of metal-oxide-semiconductor, and Switching Power Supply powers to the load continuously; When input voltage lower than predeterminated voltage; input undervoltage protection circuit sends and forbids output order to the Enable Pin of PWM Drive and Control Circuit; the PWM Drive and Control Circuit is sent low level to the control utmost point of M0S pipe, and Switching Power Supply stops powering to the load, and realizes by this input undervoltage protection.
Referring to the preferred embodiment shown in Fig. 2, input undervoltage protection circuit comprises: the first to the 9th resistance, the first electric capacity, the first to the 3rd triode and voltage stabilizing didoe, the anodal power supply buses BULK of a termination of the first resistance R 1 wherein, another termination second resistance R 2 of the first resistance R 1 and an end of the 6th resistance R 6, another termination the 9th resistance R 9 of the second resistance R 2, the first capacitor C 1, the 3rd resistance R 3, one end of the 4th resistance R 4 and the negative electrode of voltage stabilizing didoe ZD1, the collector electrode of another termination the 3rd triode Q3 of the 9th resistance R 9, the base stage of the 3rd triode Q3 connects an end of the 8th resistance R 8, the anode of voltage stabilizing didoe ZD1 connects the base stage of an end and the first triode Q1 of the 5th resistance R 5, one end of another termination the 7th resistance R 7 of the 6th resistance R 6, the collector electrode of the other end of the 8th resistance R 8 and the first triode Q1, the base stage of another termination second triode Q2 of the 7th resistance R 7, the emitter of the 3rd triode Q3, the other end of the first capacitor C 1, the other end of the 3rd resistance R 3, the other end of the 4th resistance R 4, the other end of the 5th resistance R 5, the emitter of the first triode Q1, meet negative pole power supply buses PGND after the emitter short circuit of the second triode Q2, the collector electrode of the second triode Q2 sends the described output order of forbidding.
The operation principle of input undervoltage protection circuit is described in detail in detail below in conjunction with Fig. 2 and Fig. 1:
Connect a large capacitor C 9 between anodal power supply buses BULK and negative pole power supply buses PGND, input voltage is taken out by the C9 two ends, through the first resistance R 1 step-down, then through the 3rd resistance R 3 of the second resistance R 2, parallel connection and the negative electrode that the 4th resistance R 4 dividing potential drops are added in voltage stabilizing didoe ZD1.When input voltage during in normal range of operation, the voltage stabilizing value of the current potential Va>ZD1 of voltage stabilizing didoe ZD1 negative electrode, Q1 base stage high potential, the Q1 conducting, the Vb current potential is dragged down, approximate 0 voltage, cause the Q2 cut-off, Q2 collector electrode output high potential, the Enable Pin EN high potential of PWM Drive and Control Circuit enables, electronegative potential is forbidden output, so the PWM Drive and Control Circuit is normally exported.When input voltage when setting under-voltage value, the voltage stabilizing value of Va<ZD1, the Q1 cut-off, Vb is high potential, the Q2 conducting is moved the Enable Pin EN of PWM Drive and Control Circuit to 0 current potential, PWM drives chip to close output, thereby has realized under-voltage protection function.
Return difference circuit when Q3, R8, R9 form undervoltage turnoff/recovery.When undervoltage turnoff, the Q3 conducting, by R9 and R3& The R4 parallel connection
during recovery, the Q3 cut-off,
hysteresis voltage is (V
bULK'-V
bULK).
Referring to the preferred embodiment shown in Fig. 1, the two ends of the armature winding of transformer connect the RCD snubber circuit.
Referring to the preferred embodiment shown in Fig. 1, the output of output rectification circuit connects the output voltage feedback circuit, the output voltage that the output voltage feedback circuit collects to PWM Drive and Control Circuit feedback by optical coupling isolation device.The PWM Drive and Control Circuit realizes closed-loop control by this, regulated output voltage.
Referring to the preferred embodiment shown in Fig. 1, anodal power supply buses is connected civil power by input rectification circuit with input filter circuit with the negative pole power supply buses.
Referring to the preferred embodiment shown in Fig. 1, transformer also comprises a power supply winding, the described negative pole power supply buses of one termination, its other end connects the power end of PWM Drive and Control Circuit by the first diode D1, the power end of PWM Drive and Control Circuit connects described anodal power supply buses by the tenth resistance R 10.Provide a stable working power for the PWM Drive and Control Circuit by this.
Above embodiment is only for illustrating, non-providing constraints.Anyly do not break away from the application's spirit and category, and the equivalent modifications that it is carried out or change all should be contained among the application's claim scope.
Claims (6)
1. the Switching Power Supply of a tape input under-voltage protection; comprise anodal power supply buses, negative pole power supply buses, transformer; the anodal power supply buses of armature winding one termination of this transformer, the other end connect the negative pole power supply buses by metal-oxide-semiconductor; the control utmost point of metal-oxide-semiconductor connects the output of PWM Drive and Control Circuit; the secondary winding of described transformer provides direct current by output rectification circuit to load; it is characterized in that: also comprise input undervoltage protection circuit
The signals collecting end of input undervoltage protection circuit connects anodal power supply buses and negative pole power supply buses, in order to Gather and input voltage;
The output of input undervoltage protection circuit connects the Enable Pin of PWM Drive and Control Circuit, in order at input voltage, to send and to forbid output order to the PWM Drive and Control Circuit during lower than predeterminated voltage.
2. the Switching Power Supply of tape input under-voltage protection as claimed in claim 1, is characterized in that, described input undervoltage protection circuit comprises: the first to the 9th resistance, the first electric capacity, the first to the 3rd triode and voltage stabilizing didoe, wherein
The anodal power supply buses of one termination of the first resistance, another termination second of the first resistance and an end of the 6th resistance, another termination the 9th resistance of the second resistance, the first electric capacity, the 3rd resistance, one end of the 4th resistance and the negative electrode of voltage stabilizing didoe, the collector electrode of another termination the 3rd triode of the 9th resistance, the base stage of the 3rd triode connects an end of the 8th resistance, the anode of voltage stabilizing didoe connects the base stage of an end and first triode of the 5th resistance, one end of another termination the 7th resistance of the 6th resistance, the collector electrode of the other end of the 8th resistance and the first triode, the base stage of another termination the second triode of the 7th resistance, the emitter of the 3rd triode, the other end of the first electric capacity, the other end of the 3rd resistance, the other end of the 4th resistance, the other end of the 5th resistance, the emitter of the first triode, connect the negative pole power supply buses after the emitter short circuit of the second triode, the collector electrode of the second triode sends the described output order of forbidding.
3. the Switching Power Supply of tape input under-voltage protection as claimed in claim 2, is characterized in that, the two ends of the armature winding of described transformer connect the RCD snubber circuit.
4. the Switching Power Supply of tape input under-voltage protection as claimed in claim 3; it is characterized in that; the output of described output rectification circuit connects the output voltage feedback circuit, the output voltage that the output voltage feedback circuit collects to PWM Drive and Control Circuit feedback by optical coupling isolation device.
5. the Switching Power Supply of tape input under-voltage protection as claimed in claim 4, is characterized in that, described anodal power supply buses is connected civil power by input rectification circuit with input filter circuit with the negative pole power supply buses.
6. the Switching Power Supply of tape input under-voltage protection as claimed in claim 5; it is characterized in that; described transformer also comprises a power supply winding; the described negative pole power supply buses of one termination; its other end connects the power end of PWM Drive and Control Circuit by the first diode, the power end of PWM Drive and Control Circuit connects described anodal power supply buses by the tenth resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320360417 CN203368331U (en) | 2013-06-21 | 2013-06-21 | Switch power supply with input under-voltage protection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320360417 CN203368331U (en) | 2013-06-21 | 2013-06-21 | Switch power supply with input under-voltage protection function |
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| Publication Number | Publication Date |
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| CN203368331U true CN203368331U (en) | 2013-12-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201320360417 Expired - Fee Related CN203368331U (en) | 2013-06-21 | 2013-06-21 | Switch power supply with input under-voltage protection function |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107834834A (en) * | 2017-11-06 | 2018-03-23 | 湖北三江航天万峰科技发展有限公司 | A kind of power tube drive device with power-down protection |
| CN108347036A (en) * | 2017-09-30 | 2018-07-31 | 深圳市芯茂微电子有限公司 | A kind of switching power circuit and LED drive circuit of band input overvoltage/undervoltage protection |
| CN109412400A (en) * | 2018-11-26 | 2019-03-01 | 珠海格力电器股份有限公司 | Flyback switching power supply and undervoltage protection circuit thereof |
| CN110492442A (en) * | 2019-07-25 | 2019-11-22 | 杭州洲钜电子科技有限公司 | A kind of ACDC protective circuit of switch power source and guard method |
-
2013
- 2013-06-21 CN CN 201320360417 patent/CN203368331U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108347036A (en) * | 2017-09-30 | 2018-07-31 | 深圳市芯茂微电子有限公司 | A kind of switching power circuit and LED drive circuit of band input overvoltage/undervoltage protection |
| CN108347036B (en) * | 2017-09-30 | 2020-06-12 | 深圳市芯茂微电子有限公司 | Switching power supply circuit with input over-voltage and under-voltage protection and LED drive circuit |
| CN107834834A (en) * | 2017-11-06 | 2018-03-23 | 湖北三江航天万峰科技发展有限公司 | A kind of power tube drive device with power-down protection |
| CN109412400A (en) * | 2018-11-26 | 2019-03-01 | 珠海格力电器股份有限公司 | Flyback switching power supply and undervoltage protection circuit thereof |
| CN110492442A (en) * | 2019-07-25 | 2019-11-22 | 杭州洲钜电子科技有限公司 | A kind of ACDC protective circuit of switch power source and guard method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: SHENZHEN JINGFUYUAN TECH. CO., LTD. Free format text: FORMER NAME: SHENZHEN JINGFUYUAN TECHNOLOGY CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: Shenzhen Nanshan District City, Guangdong province 518000 white pine Luxili Nangang Second Industrial Park 12 Building 1, 2, 5 floor Patentee after: SHENZHEN JINGFUYUAN TECHNOLOGY CO., LTD. Address before: Shenzhen Nanshan District City, Guangdong province 518000 white pine Luxili Nangang Second Industrial Park 12 Building 1, 2, 5 floor Patentee before: Shenzhen Jingfuyuan Tech Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131225 Termination date: 20160621 |