CN114710018A - PFC protection circuit for fast startup and shutdown - Google Patents
PFC protection circuit for fast startup and shutdown Download PDFInfo
- Publication number
- CN114710018A CN114710018A CN202210627057.9A CN202210627057A CN114710018A CN 114710018 A CN114710018 A CN 114710018A CN 202210627057 A CN202210627057 A CN 202210627057A CN 114710018 A CN114710018 A CN 114710018A
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- resistor
- voltage
- pfc
- diode
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
A PFC protection circuit for fast power on and off, comprising: the input end of the input end is used for charging a capacitor C1 through a clamping diode D1 and a resistor R1, the input end L is connected with a PFC chip U4 through a resistor R2, a diode D2 and a resistor R3, and the input end further comprises the following steps based on the circuit; when the computer is started, the input end L charges the capacitor C1, and voltage difference is generated between the two ends; the diode D2 is cut off in the reverse direction, and the PFC chip U4 starts to work; when the power-off circuit is turned off, the voltage is rapidly discharged to the input end L through the resistor R2, and the diode D2 is conducted; after the circuit is switched on, voltage is discharged to the input end L through the resistor R3, the diode D2 and the resistor R2, so that the VCC end of the PFC chip U4 reaches a power supply under-voltage value state, and the next switching-on is a soft start.
Description
Technical Field
The invention relates to the field of LED outdoor power supplies, in particular to a PFC (power factor correction) protection circuit capable of being rapidly turned on and turned off.
Background
The LED power supply has the advantages that the energy conservation and high efficiency are realized, the environmental protection is rapidly developed in recent years, the plant lighting power supply in the important field of the LED power supply is developed and strengthened, the output power is gradually developed from the previous medium and small power to the high power, because of the large power, the PFC usually uses a continuous operation mode, and because most PFC ICs do not have input feed-forward samples, when the power is turned off, if the supply voltage of the PFC IC does not drop to the VCC undervoltage value, the soft start of the PFC is not effected, the starting current is rushed to be larger, has certain impact on a power grid and circuit elements, and a plurality of application occasions adopt a breaker to integrally control a plurality of high-power supplies, if the impact on the power grid is larger during fast startup and shutdown (such as immediate power-on during power grid instantaneous trip and power-off), the circuit breaker needs to adopt a larger specification model, the cost is wasted, and the circuit breaker cannot play a good protection role during normal work.
Disclosure of Invention
In order to solve the above problems, the present technical solution provides a PFC protection circuit for fast power on and power off.
In order to achieve the purpose, the technical scheme is as follows:
a PFC protection circuit for fast power on and off, comprising:
the input end L charges a capacitor C1 through a clamping diode D1 and a resistor R1, a terminal V2 is arranged on the input end L, the input end L is connected with a PFC chip U4 through a resistor R2, a diode D2 and a resistor R3, and a terminal V3 is arranged on the input end L;
based on the circuit, the method further comprises the following steps;
when the power-on device is turned on, the input end L charges the capacitor C1, so that the voltage of the endpoint V2 is greater than the voltage of the endpoint V3;
the diode D2 is cut off in the reverse direction, and the PFC chip U4 starts to work;
when the power-off circuit is turned off, the voltage of the terminal V2 is rapidly discharged to the input terminal L through the resistor R2, and the diode D2 is turned on until the voltage of the terminal V2 is lower than the voltage of the terminal V3;
after the switch-on, the voltage of the terminal V3 is discharged to the input terminal L through the resistor R3, the diode D2 and the resistor R2, so that the VCC terminal of the PFC chip U4 reaches a power supply undervoltage state, and the next switch-on is a soft start.
In some embodiments, the resistor R1 has a resistance value of 10-15K.
In some embodiments, the soft-start peak current of the PFC chip U4 is 2A.
The beneficial effect of this application does:
this application utilizes the voltage difference cooperation diode of two endpoints to realize single-phase switching on to make PFC chip U4 discharge fast, thereby reach the power supply undervoltage value state, when restarting next time, the chip can soft start, thereby reduce the impact force to the component, play fine guard action to the circuit.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below.
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, a PFC protection circuit for fast power on/off includes:
the input end L charges a capacitor C1 through a clamping diode D1 and a resistor R1, a terminal V2 is arranged on the input end L, the input end L is connected with a PFC chip U4 through a resistor R2, a diode D2 and a resistor R3, and a terminal V3 is arranged on the input end L;
based on the circuit, the method further comprises the following steps;
when the power-on device is turned on, the input end L charges the capacitor C1, so that the voltage of the endpoint V2 is greater than the voltage of the endpoint V3;
the diode D2 is cut off in the reverse direction, and the PFC chip U4 starts to work;
when the power-off circuit is turned off, the voltage of the terminal V2 is rapidly discharged to the input terminal L through the resistor R2, and the diode D2 is turned on until the voltage of the terminal V2 is lower than the voltage of the terminal V3;
after the switch-on, the voltage of the terminal V3 is discharged to the input terminal L through the resistor R3, the diode D2 and the resistor R2, so that the VCC terminal of the PFC chip U4 reaches a power supply undervoltage state, and the next switch-on is a soft start, and the above steps are repeated;
specifically, the anode of the diode D1 is connected to L, and when the device is turned on, the alternating current L passes through the anode of the diode D1, the cathode of the diode D1, one end of the resistor R1, the other end of the resistor R1, one end of the capacitor C1, and the other end of the capacitor C1 to be charged and filtered; the diode D2 is used for receiving a starting alternating current signal, and when the voltage of the capacitor C1 is charged to exceed the VCC value of the PFC chip, the diode D2 is cut off in the reverse direction; when the VCC voltage rises to the PFC starting voltage value, the PFC is in soft start operation, and the PFC starting current is only about 2A at the moment; when the power-off is performed, the L-phase voltage is zero, one end (a V2 endpoint) of the capacitor C1, one end of the resistor R2 and the other end of the resistor R2 discharge the L-phase quickly, when the voltage of the capacitor C1 discharges to a value lower than that of a PFC chip VCC (a V3 endpoint), the voltage of the PFC chip VCC starts to discharge the L-phase quickly through the resistor R3 and the diode D2, and the resistor R2 discharges to the L-phase quickly, and when the voltage of the PFC chip VCC discharges to a power supply undervoltage value of the PFC IC, the circuit returns to an original state to prepare for next startup soft start.
In some embodiments, the resistance value of the resistor R1 is 10-15K; the proper value of the resistor R1 is selected, so that the valley bottom voltage of the capacitor C1 is always larger than the voltage value of the PFC chip VCC, at the moment, the diode D2 is cut off in the reverse direction, and the normal work of the PFC is not influenced.
In some embodiments, the soft-start peak current of the PFC chip U4 is 2A.
The above description is only a preferred embodiment of the present application and is not intended to limit the scope of the present application, and other embodiments and basic structures that are the same as or similar to the present application are within the scope of the present application.
Claims (3)
1. A PFC protection circuit for fast startup and shutdown is characterized by comprising:
the input end L charges a capacitor C1 through a clamping diode D1 and a resistor R1, a terminal V2 is arranged on the input end L, the input end L is connected with a PFC chip U4 through a resistor R2, a diode D2 and a resistor R3, and a terminal V3 is arranged on the input end L;
based on the circuit, the method further comprises the following steps;
when the power-on device is turned on, the input end L charges the capacitor C1, so that the voltage of the endpoint V2 is greater than the voltage of the endpoint V3;
the diode D2 is cut off in the reverse direction, and the PFC chip U4 starts to work;
when the power-off circuit is turned off, the voltage of the terminal V2 is rapidly discharged to the input terminal L through the resistor R2, and the diode D2 is turned on until the voltage of the terminal V2 is lower than the voltage of the terminal V3;
after the switch-on, the voltage of the terminal V3 is discharged to the input terminal L through the resistor R3, the diode D2 and the resistor R2, so that the VCC terminal of the PFC chip U4 reaches a power supply undervoltage state, and the next switch-on is a soft start.
2. The PFC protection circuit of claim 1, wherein: the resistance value of the resistor R1 is 10-15K.
3. The PFC protection circuit of claim 2, wherein: the soft start peak current of the PFC chip U4 is 2A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210627057.9A CN114710018B (en) | 2022-06-06 | 2022-06-06 | PFC (power factor correction) protection circuit for quick startup and shutdown |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210627057.9A CN114710018B (en) | 2022-06-06 | 2022-06-06 | PFC (power factor correction) protection circuit for quick startup and shutdown |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114710018A true CN114710018A (en) | 2022-07-05 |
| CN114710018B CN114710018B (en) | 2022-09-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210627057.9A Active CN114710018B (en) | 2022-06-06 | 2022-06-06 | PFC (power factor correction) protection circuit for quick startup and shutdown |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116526428A (en) * | 2023-07-04 | 2023-08-01 | 广东东菱电源科技有限公司 | BUCK fast switch-on and switch-off protection circuit |
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| CN216390802U (en) * | 2021-08-19 | 2022-04-26 | 宁波三星智能电气有限公司 | Switching power supply circuit of ammeter |
| US20220166318A1 (en) * | 2020-11-24 | 2022-05-26 | Stmicroelectronics S.R.L. | Soft-start of a dc-dc converter based on capacitor switching |
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2022
- 2022-06-06 CN CN202210627057.9A patent/CN114710018B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20040032754A1 (en) * | 2002-08-19 | 2004-02-19 | Jian Yang | Multiple output power supply having soft start protection for load over-current or short circuit conditions |
| EP1643631A1 (en) * | 2004-10-01 | 2006-04-05 | Matsushita Electric Industrial Co., Ltd. | Power supply circuit for an air conditioner |
| US20110103104A1 (en) * | 2009-10-30 | 2011-05-05 | Intersil Americas Inc. | Bias and discharge system for low power loss start up and input capacitance discharge |
| CN201656761U (en) * | 2010-01-08 | 2010-11-24 | 康佳集团股份有限公司 | Soft start circuit for PFC switch power supply |
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| CN203368312U (en) * | 2013-06-14 | 2013-12-25 | 深圳可立克科技股份有限公司 | Circuit for anti-magnetic saturation of transformer and flyback circuit |
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| CN204216779U (en) * | 2014-10-24 | 2015-03-18 | 常州格力博有限公司 | A kind of jetting machine controller hardware realizes soft starting circuit |
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| CN209963949U (en) * | 2019-06-06 | 2020-01-17 | 石家庄泽润科技有限公司 | Soft start circuit of current type pulse width modulator chip |
| CN212627837U (en) * | 2020-04-30 | 2021-02-26 | 深圳市鼎盛光电有限公司 | Vehicle-mounted delay circuit, vehicle-mounted delay system and automobile |
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| Publication number | Priority date | Publication date | Assignee | Title |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN114710018B (en) | 2022-09-02 |
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