CN103490387B - A kind of single-stage PFC fly-back power source input under-voltage protection circuit - Google Patents
A kind of single-stage PFC fly-back power source input under-voltage protection circuit Download PDFInfo
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- CN103490387B CN103490387B CN201310448854.1A CN201310448854A CN103490387B CN 103490387 B CN103490387 B CN 103490387B CN 201310448854 A CN201310448854 A CN 201310448854A CN 103490387 B CN103490387 B CN 103490387B
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- resistance
- triode
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- voltage
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Classifications
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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
-
- 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
Abstract
The invention discloses a kind of single-stage PFC fly-back power source input under-voltage protection circuit, belong to electrical lighting technical field.Cathode rectifier connects the first resistance and the 6th resistance simultaneously, and feeder ear connects the C pole of the second triode; The B pole of the second triode connects the C pole of the 3rd triode through the 7th resistance, and connects the B pole of the first triode through the 5th resistance; The C pole of the first triode connects the anode of voltage-stabiliser tube through the 4th resistance, the negative electrode of voltage-stabiliser tube connects the B pole of the 3rd triode; E pole all ground connection of first, second and third triode.The present invention realizes single-stage PFC fly-back power source input under-voltage protection circuit with low cost, simple circuit, guarantees in input voltage unstable region, effectively can reduce the power supply damage that brownout causes.
Description
Technical field
The present invention relates to electrical lighting technical field, particularly a kind of single-stage PFC fly-back power source input under-voltage protection circuit.
Background technology
Along with the fast development of LED technology is increasingly mature with application, LED drive power can the pith of luminescence display as LED, and its technical development is swift and violent.In order to realize efficient energy-saving requirement, PF(power factor (PF) is proposed to LED drive power) be more than or equal to 0.9 requirement, add because volume is restricted, one pole PFC Flyback configuration becomes the line construction being suitable for LED drive source most.In the typical apply of single-stage PFC flyback circuit, drive IC is as SY5800, SY5810, MP4021 etc., its work power on mode is that IC powers by Vin pin, high-pressure side, former limit is needed to power during initial start, it is auxiliary winding power after starting, and because of output voltage constant, auxiliary winding power is also constant, this just causes power output do not decline with input voltage and decline, when input voltage be down to below 90V work time, input current can enlarge markedly with the reduction of voltage, now just there is the saturated aircraft bombing of transformer, input differential mode common mode inductance temperature rises fusing winding and damage the risk of 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 fly-back power source input under-voltage protection circuit.
The object of the invention is by realize by the following technical solutions:
A kind of single-stage PFC fly-back power source input under-voltage protection circuit, first resistance (R1) one end, 6th resistance (R6) one end connects cathode rectifier (Vin), the C pole of the second triode (Q2) connects IC feeder ear (Vcc), the B pole of the second triode is through the 7th resistance (R7) and the 6th resistance (R6) other end, the C pole of the 3rd triode is connected to form Section Point magnitude of voltage (V2), the B pole of the 3rd triode connects the negative electrode of the 3rd resistance (R3) one end and voltage-stabiliser tube (ZD1) simultaneously, the anode of voltage-stabiliser tube (ZD1) and the first resistance (R1) other end, second resistance (R2), electric capacity (C1) is connected to form first node magnitude of voltage (V1), the E pole of the second triode (Q2), the E pole of the 3rd triode, 3rd resistance (R3) other end, second resistance (R2) other end, electric capacity (C1) other end ground connection.
As alternatives of the present invention, also comprise the first triode (Q1), the 4th resistance (R4) and the 5th resistance (R5), the C pole of described first triode (Q1) connects the anode of voltage-stabiliser tube (ZD1) through the 4th resistance (R4), B pole connects the C pole of the 3rd triode by the 5th resistance, E pole ground connection.
As alternatives of the present invention, described IC can adopt SY5800, SY5810, MP4021 any one.
In sum, single-stage PFC fly-back power source input under-voltage protection circuit provided by the present invention, the beneficial effect had:
1, circuit is simple, and electronic devices and components are few, greatly reduce cost.
2, input undervoltage protection, avoids 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 input voltage unstable region, effectively can reduce the power supply damage that brownout causes.
4, circuit is simple thus to form production technology simple, improves production efficiency, reduces production cost.
Accompanying drawing explanation
Fig. 1 is the input undervoltage protection circuit schematic diagram of single-stage PFC flyback sourse first embodiment of the present invention.
Fig. 2 is the input undervoltage protection circuit schematic diagram of single-stage PFC flyback sourse second embodiment of the present invention.
Description of reference numerals: Vin: cathode rectifier, Vcc: feeder ear, the R1: the first resistance, R2: the second resistance, the R3: the three resistance, the R4: the four resistance, R5: the five resistance, the R6: the six resistance, the R7: the seven resistance, Q1: the first triode, the Q2: the second triode, the Q3: the three 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.The explanation of following reference accompanying drawing to embodiments of the present invention is intended to make an explanation to present general inventive concept of the present invention, and not should be understood to one restriction of the present invention.
With reference to shown in accompanying drawing 1,2; the invention provides a kind of single-stage PFC fly-back power source input under-voltage 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) 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 first embodiment, one end of the first resistance (R1) is connected cathode rectifier (Vin) with one end of the 6th resistance (R6) simultaneously.The C pole of the second triode (Q2) connects IC feeder ear (Vcc), and B pole 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 pole of the 3rd triode, and E pole connects ground.The B pole of the 3rd triode connects one end of the 3rd resistance (R3) and the negative electrode of voltage-stabiliser tube (ZD1) simultaneously, and E pole is connected to ground.The anode of voltage-stabiliser tube (ZD1) is connected with the other end of the first resistance (R1), one end of the second resistance (R2), one end of electric capacity (C1) simultaneously and forms first node magnitude of voltage (V1) afterwards.Also has the other end of the 3rd resistance (R3), the other end of the second resistance (R2), the other end all ground connection of electric capacity (C1).
According to Fig. 1 first embodiment, when input voltage is in normal range of operation, when first node magnitude of voltage (V1) is greater than the voltage stabilizing value of voltage-stabiliser tube (ZD1), 3rd triode (Q3) conducting, Section Point magnitude of voltage (V2) is zero potential, second triode (Q2) ends, and now protective circuit is inoperative; When input voltage is lower than setting under-voltage value; first node magnitude of voltage (V1) is less than the voltage stabilizing value of voltage-stabiliser tube (ZD1); 3rd triode (Q3) cut-off; Section Point magnitude of voltage is high potential; second triode (Q2) conducting; move feeder ear (Vcc) to zero potential, chip is closed and is exported, thus achieves under-voltage protection function.
As shown in Fig. 2 second embodiment, on the first original schematic diagram basis of embodiment, increase the first triode (Q1), the 4th resistance (R4) and the 5th resistance (R5).Concrete, the C pole of described first triode (Q1) connects the anode of voltage-stabiliser tube (ZD1) through the 4th resistance (R4), B pole connects the C pole of the 3rd triode (Q3) by the 5th resistance (R5), E pole ground connection.
Composition graphs 2 second embodiment, when input voltage is in normal range of operation, when first node magnitude of voltage (V1) is greater than the voltage stabilizing value of voltage-stabiliser tube (ZD1), 3rd triode (Q3) conducting, Section Point magnitude of voltage (V2) is zero potential, second triode (Q2) ends, and now protective circuit is inoperative; When input voltage is lower than setting under-voltage value; first node magnitude of voltage (V1) is less than the voltage stabilizing value of voltage-stabiliser tube (ZD1); 3rd triode (Q3) cut-off; Section Point magnitude of voltage is high potential; second triode (Q2) conducting; move feeder ear (Vcc) to zero potential, chip is closed and is exported, thus achieves under-voltage protection function.Now, the 4th resistance (R4), the first triode (Q1), the 4th resistance (R4) form undervoltage turnoff and return difference circuit when recovering.
Above-mentioned IC can adopt any one in SY5800, SY5810, MP4021 model, and the present invention adopts SY5800 model.
The above embodiment only have expressed the preferred embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not 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 (2)
1. a single-stage PFC fly-back power source input under-voltage protection circuit, is characterized in that: comprise the first resistance (R1), 6th resistance (R6), cathode rectifier (Vin), second triode (Q2), 7th resistance (R7), 3rd triode, 3rd resistance (R3), voltage-stabiliser tube (ZD1), second resistance (R2), electric capacity (C1), the first resistance (R1) one end, 6th resistance (R6) one end connects cathode rectifier (Vin), and the C pole of the second triode (Q2) connects IC feeder ear (Vcc), and the B pole of the second triode is through the 7th resistance (R7) and the 6th resistance (R6) other end, the C pole of the 3rd triode is connected to form Section Point magnitude of voltage (V2), and the B pole of the 3rd triode connects the negative electrode of the 3rd resistance (R3) one end and voltage-stabiliser tube (ZD1), the anode of voltage-stabiliser tube (ZD1) and the first resistance (R1) other end simultaneously, second resistance (R2), electric capacity (C1) is connected to form first node magnitude of voltage (V1), the E pole of the second triode (Q2), the E pole of the 3rd triode, 3rd resistance (R3) other end, second resistance (R2) other end, electric capacity (C1) other end ground connection,
Also comprise the first triode (Q1), the 4th resistance (R4) and the 5th resistance (R5), the C pole of described first triode (Q1) connects the anode of voltage-stabiliser tube (ZD1) through the 4th resistance (R4), B pole connects the C pole of the 3rd triode by the 5th resistance (R5), E pole ground connection.
2. according to claim 1, described single-stage PFC fly-back power source input under-voltage protection circuit, is characterized in that: described IC adopts any one in SY5800, SY5810, MP4021.
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 CN103490387A (en) | 2014-01-01 |
| CN103490387B true 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)
| Country | Link |
|---|---|
| CN (1) | CN103490387B (en) |
| WO (1) | WO2015043052A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3881135A (en) * | 1974-01-31 | 1975-04-29 | Rca Corp | Boost regulator with high voltage protection |
| CN100454711C (en) * | 2003-07-29 | 2009-01-21 | 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 |
| 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 | 艾默生网络能源系统北美公司 | Power supply under-voltage protection circuit and power supply containing the same |
| 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 |
| CN201319558Y (en) * | 2008-11-24 | 2009-09-30 | 中兴通讯股份有限公司 | Under-voltage locking 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 |
-
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
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| Publication number | Publication date |
|---|---|
| WO2015043052A1 (en) | 2015-04-02 |
| CN103490387A (en) | 2014-01-01 |
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Granted publication date: 20151209 Termination date: 20160928 |