CN103490387A - Single-stage PFC fly-back power source input under-voltage protection circuit - Google Patents
Single-stage PFC fly-back power source input under-voltage protection circuit Download PDFInfo
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- CN103490387A CN103490387A CN201310448854.1A CN201310448854A CN103490387A CN 103490387 A CN103490387 A CN 103490387A CN 201310448854 A CN201310448854 A CN 201310448854A CN 103490387 A CN103490387 A CN 103490387A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
- H02H3/243—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage for DC systems
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a single-stage PFC fly-back power source input under-voltage protection circuit, and belongs to the technical field of electronic lighting. A positive electrode of a rectifier bridge is connected with a first resistor and a sixth resistor at the same time. A power supply end is connected with an electrode C of a second audion. An electrode B of the second audion is connected with an electrode C of a third audion through a seventh resistor and connected with an electrode B of a first audion through a fifth resistor. An electrode C of the first audion is connected with an anode of a voltage-regulator tube through a fourth resistor. A cathode of the voltage-regulator tube is connected with an electrode B of the third audion. An electrode E of the first audion, an electrode E of the second audion and an electrode E of the third audion are all connected to the ground. With the low-cost and simple circuit, the single-stage PFC fly-back power source input under-voltage protection circuit is achieved, and damage, caused by excessively-low voltage, to a power source in a region with the unstable input voltage can be effectively reduced.
Description
Technical field
The present invention relates to the electrical lighting technical field, particularly a kind of single-stage PFC flyback power supply input undervoltage protection circuit.
Background technology
Along with the fast development of LED technology is increasingly mature with application, the pith that the LED driving power can luminescence display as LED, its technical development is swift and violent.In order to realize the efficient energy-saving requirement, the LED driving power has been proposed to the PF(power factor (PF)) be more than or equal to 0.9 requirement, to add because volume is restricted, one pole PFC flyback structure becomes the line construction of the most applicable LED drive source.In typical case's application of single-stage PFC flyback circuit, drive IC is as SY5800, SY5810, MP4021 etc., its work power on mode is the IC power supply by the Vin pin, need the power supply of high-pressure side, former limit during initial start, it after starting, is auxiliary winding power supply, and because of output voltage constant, auxiliary winding power supply is also constant, this just causes power output not descend with input voltage, while working below input voltage is down to 90V, input current can enlarge markedly with the reduction of voltage, now just there is the saturated aircraft bombing of transformer, the risk that input differential mode common mode inductance temperature rises and fuses winding and damage power supply.
Summary of the invention
In order to solve above-mentioned existing technical deficiency and defect, the object of the present invention is to provide a kind of single-stage PFC flyback power supply input undervoltage protection circuit.
The objective of the invention is by realizing by the following technical solutions:
A kind of single-stage PFC flyback power supply input undervoltage protection circuit, the first resistance (R1) end, the 6th resistance (R6) end connects cathode rectifier (Vin), the C utmost point of the second triode (Q2) connects IC feeder ear (Vcc), the B utmost point of the second triode is through the 7th resistance (R7) and the 6th resistance (R6) other end, the C utmost point of the 3rd triode is connected to form Section Point magnitude of voltage (V2), the B utmost point of the 3rd triode connects the negative electrode of the 3rd resistance (R3) end and voltage-stabiliser tube (ZD1) simultaneously, the anode of voltage-stabiliser tube (ZD1) and the first resistance (R1) other end, the second resistance (R2), electric capacity (C1) is connected to form first node magnitude of voltage (V1), the E utmost point of the second triode (Q2), the E utmost point of the 3rd triode, the 3rd resistance (R3) other end, the second resistance (R2) other end, electric capacity (C1) other end ground connection.
As the optional technical scheme of the present invention, also comprise the first triode (Q1), the 4th resistance (R4) and the 5th resistance (R5), the C utmost point of described the first triode (Q1) connects the anode of voltage-stabiliser tube (ZD1) through the 4th resistance (R4), the B utmost point connects the C utmost point of the 3rd triode, E utmost point ground connection by the 5th resistance.
As the optional technical scheme of the present invention, described IC can adopt SY5800, SY5810, MP4021 any.
In sum, single-stage PFC flyback power supply input undervoltage protection circuit provided by the present invention, the beneficial effect had:
1, circuit is simple, and electronic devices and components are few, greatly reduces cost.
2, input undervoltage protection, avoid causing the saturated aircraft bombing of power transformer because input voltage is too low, avoids damaging power supply because of input differential mode common mode inductance temperature rising fusing winding.
3, guarantee in the input voltage unstable region, can effectively reduce the power supply damage that brownout causes.
4, thereby the simple formation of circuit production technology is simple, has improved production efficiency, has reduced production cost.
The accompanying drawing explanation
The input undervoltage protection circuit schematic diagram that Fig. 1 is single-stage PFC flyback power supply of the present invention the first embodiment.
The input undervoltage protection circuit schematic diagram that Fig. 2 is single-stage PFC flyback power supply of the present invention the second embodiment.
Description of reference numerals: Vin: cathode rectifier, Vcc: feeder ear, R1: the first resistance, R2: the second resistance, R3: the 3rd resistance, R4: the 4th resistance, R5: the 5th resistance, R6: the 6th resistance, R7: the 7th resistance, Q1: the first triode, Q2: the second triode, Q3: the 3rd triode, ZD1: voltage-stabiliser tube, C1: electric capacity, V1: first node magnitude of voltage, V2: Section Point magnitude of voltage.
Embodiment
Below by embodiment also by reference to the accompanying drawings, technical scheme of the present invention is described in further detail.Following with reference to accompanying drawing, the explanation to embodiments of the present invention is intended to present general inventive concept of the present invention is made an explanation, and not should be understood to a kind of restriction of the present invention.
Shown in accompanying drawing 1,2; the invention provides a kind of single-stage PFC flyback power supply input undervoltage protection circuit; mainly comprise cathode rectifier (Vin), feeder ear (Vcc), the first resistance (R1): the second resistance (R2), the 3rd resistance (R3), the 4th resistance (R4), the 5th resistance (R5), the 6th resistance (R6), the 7th resistance (R7) the first triode (Q1), the second triode (Q2), the 3rd triode (Q3), voltage-stabiliser tube (ZD1), electric capacity (C1), first node magnitude of voltage (V1) and Section Point magnitude of voltage (V2).
As shown in Fig. 1 the first embodiment, an end of an end of the first resistance (R1) and the 6th resistance (R6) is connected cathode rectifier (Vin) simultaneously.The C utmost point of the second triode (Q2) connects IC feeder ear (Vcc), and the B utmost point is connected to form Section Point magnitude of voltage (V2) through the 7th resistance (R7) and the other end of the 6th resistance (R6), the C utmost point of the 3rd triode, and the E utmost point connects ground.The B utmost point of the 3rd triode connects an end of the 3rd resistance (R3) and the negative electrode of voltage-stabiliser tube (ZD1) simultaneously, and the E utmost point is connected with ground.The anode of voltage-stabiliser tube (ZD1) is connected the rear first node magnitude of voltage (V1) that forms with the other end of the first resistance (R1), an end of the second resistance (R2), an end of electric capacity (C1) simultaneously.The other end ground connection all that also has the other end, the electric capacity (C1) of the other end, second resistance (R2) of the 3rd resistance (R3).
According to Fig. 1 the first embodiment, input voltage is in normal range of operation the time, when first node magnitude of voltage (V1) is greater than the voltage stabilizing value of voltage-stabiliser tube (ZD1), the 3rd triode (Q3) conducting, Section Point magnitude of voltage (V2) is zero potential, the second triode (Q2) cut-off, now protective circuit is inoperative; When input voltage when setting under-voltage value; first node magnitude of voltage (V1) is less than the voltage stabilizing value of voltage-stabiliser tube (ZD1); the 3rd triode (Q3) cut-off; the Section Point magnitude of voltage is high potential; the second triode (Q2) conducting; move feeder ear (Vcc) to zero potential, chip is closed output, thereby has realized under-voltage protection function.
As shown in Fig. 2 the second embodiment, on the original schematic diagram of the first embodiment basis, increase the first triode (Q1), the 4th resistance (R4) and the 5th resistance (R5).Concrete, the C utmost point of described the first triode (Q1) connects the anode of voltage-stabiliser tube (ZD1) through the 4th resistance (R4), and the B utmost point connects the C utmost point of the 3rd triode (Q3), E utmost point ground connection by the 5th resistance (R5).
In conjunction with Fig. 2 the second embodiment, input voltage is in normal range of operation the time, when first node magnitude of voltage (V1) is greater than the voltage stabilizing value of voltage-stabiliser tube (ZD1), the 3rd triode (Q3) conducting, Section Point magnitude of voltage (V2) is zero potential, the second triode (Q2) cut-off, now protective circuit is inoperative; When input voltage when setting under-voltage value; first node magnitude of voltage (V1) is less than the voltage stabilizing value of voltage-stabiliser tube (ZD1); the 3rd triode (Q3) cut-off; the Section Point magnitude of voltage is high potential; the second triode (Q2) conducting; move feeder ear (Vcc) to zero potential, chip is closed output, thereby has realized under-voltage protection function.Return difference circuit when now, the 4th resistance (R4), the first triode (Q1), the 4th resistance (R4) form undervoltage turnoff and recovers.
Above-mentioned IC can adopt any in SY5800, SY5810, MP4021 model, and the present invention adopts the SY5800 model.
The above embodiment has only expressed the preferred embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention and embodiment.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.
Claims (3)
1. a single-stage PFC flyback power supply input undervoltage protection circuit, it is characterized in that: the first resistance (R1) end, the 6th resistance (R6) end connects cathode rectifier (Vin), the C utmost point of the second triode (Q2) connects IC feeder ear (Vcc), the B utmost point of the second triode is through the 7th resistance (R7) and the 6th resistance (R6) other end, the C utmost point of the 3rd triode is connected to form Section Point magnitude of voltage (V2), the B utmost point of the 3rd triode connects the negative electrode of the 3rd resistance (R3) end and voltage-stabiliser tube (ZD1) simultaneously, the anode of voltage-stabiliser tube (ZD1) and the first resistance (R1) other end, the second resistance (R2), electric capacity (C1) is connected to form first node magnitude of voltage (V1), the E utmost point of the second triode (Q2), the E utmost point of the 3rd triode, the 3rd resistance (R3) other end, the second resistance (R2) other end, electric capacity (C1) other end ground connection.
2. according to claim 1; described single-stage PFC flyback power supply input undervoltage protection circuit; it is characterized in that: also comprise the first triode (Q1), the 4th resistance (R4) and the 5th resistance (R5); the C utmost point of described the first triode (Q1) connects the anode of voltage-stabiliser tube (ZD1) through the 4th resistance (R4); the B utmost point connects the C utmost point of the 3rd triode, E utmost point ground connection by the 5th resistance (R5).
3. according to claim 1, described single-stage PFC flyback power supply input undervoltage protection circuit is characterized in that: described IC can adopt SY5800, SY5810, MP4021 any.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310448854.1A CN103490387B (en) | 2013-09-28 | 2013-09-28 | A kind of single-stage PFC fly-back power source input under-voltage protection circuit |
| PCT/CN2013/088234 WO2015043052A1 (en) | 2013-09-28 | 2013-11-29 | Single-stage pfc flyback power source input undervoltage protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310448854.1A CN103490387B (en) | 2013-09-28 | 2013-09-28 | A kind of single-stage PFC fly-back power source input under-voltage protection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103490387A true CN103490387A (en) | 2014-01-01 |
| CN103490387B CN103490387B (en) | 2015-12-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310448854.1A Expired - Fee Related CN103490387B (en) | 2013-09-28 | 2013-09-28 | A kind of single-stage PFC fly-back power source input under-voltage protection circuit |
Country Status (2)
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| CN (1) | CN103490387B (en) |
| WO (1) | WO2015043052A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106300983A (en) * | 2015-05-26 | 2017-01-04 | 福州瑞芯微电子股份有限公司 | A kind of inverse-excitation type switch power-supply input voltage measurement device and method |
| CN109412400A (en) * | 2018-11-26 | 2019-03-01 | 珠海格力电器股份有限公司 | Inverse-excitation type switch power-supply and its under-voltage protecting circuit |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112290658A (en) * | 2020-09-24 | 2021-01-29 | 许继电源有限公司 | Auxiliary power starting and main topology undervoltage protection linkage circuit and control method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3881135A (en) * | 1974-01-31 | 1975-04-29 | Rca Corp | Boost regulator with high voltage protection |
| CN1578043A (en) * | 2003-07-29 | 2005-02-09 | 华为技术有限公司 | Protecting method and apparatus for battery undervoltage |
| CN2706937Y (en) * | 2004-05-28 | 2005-06-29 | 成都瑞联电气股份有限公司 | General high-reliability switch power |
| CN201247946Y (en) * | 2008-07-30 | 2009-05-27 | 深圳创维－Rgb电子有限公司 | Under-voltage protection circuit and switch power circuit |
| CN203466558U (en) * | 2013-09-28 | 2014-03-05 | 深圳市东方之星电源有限公司 | Single-stage PFC flyback power supply input undervoltage protection circuit |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100481693C (en) * | 2006-03-10 | 2009-04-22 | 昂宝电子（上海）有限公司 | System and method for electrification reset and under-voltage locking scheme |
| CN101436771B (en) * | 2007-11-16 | 2011-12-14 | 艾默生网络能源***北美公司 | Power supply under-voltage protection circuit and power supply containing the same |
| CN201319558Y (en) * | 2008-11-24 | 2009-09-30 | 中兴通讯股份有限公司 | Under-voltage locking circuit |
-
2013
- 2013-09-28 CN CN201310448854.1A patent/CN103490387B/en not_active Expired - Fee Related
- 2013-11-29 WO PCT/CN2013/088234 patent/WO2015043052A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3881135A (en) * | 1974-01-31 | 1975-04-29 | Rca Corp | Boost regulator with high voltage protection |
| CN1578043A (en) * | 2003-07-29 | 2005-02-09 | 华为技术有限公司 | Protecting method and apparatus for battery undervoltage |
| CN2706937Y (en) * | 2004-05-28 | 2005-06-29 | 成都瑞联电气股份有限公司 | General high-reliability switch power |
| CN201247946Y (en) * | 2008-07-30 | 2009-05-27 | 深圳创维－Rgb电子有限公司 | Under-voltage protection circuit and switch power circuit |
| CN203466558U (en) * | 2013-09-28 | 2014-03-05 | 深圳市东方之星电源有限公司 | Single-stage PFC flyback power supply input undervoltage protection circuit |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106300983A (en) * | 2015-05-26 | 2017-01-04 | 福州瑞芯微电子股份有限公司 | A kind of inverse-excitation type switch power-supply input voltage measurement device and method |
| CN106300983B (en) * | 2015-05-26 | 2018-07-24 | 福州瑞芯微电子股份有限公司 | A kind of inverse-excitation type switch power-supply input voltage measurement device and method |
| CN109412400A (en) * | 2018-11-26 | 2019-03-01 | 珠海格力电器股份有限公司 | Inverse-excitation type switch power-supply and its under-voltage protecting circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2015043052A1 (en) | 2015-04-02 |
| CN103490387B (en) | 2015-12-09 |
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