CN102684516A - Alternating current driven PFC (power factor correction) changing circuit for LED white-light illumination - Google Patents
Alternating current driven PFC (power factor correction) changing circuit for LED white-light illumination Download PDFInfo
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- CN102684516A CN102684516A CN2012101294751A CN201210129475A CN102684516A CN 102684516 A CN102684516 A CN 102684516A CN 2012101294751 A CN2012101294751 A CN 2012101294751A CN 201210129475 A CN201210129475 A CN 201210129475A CN 102684516 A CN102684516 A CN 102684516A
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Abstract
The invention relates to an alternating current driven PFC (power factor correction) changing circuit for LED white-light illumination. Q1 is connected to one end of D1, C1 and an alternating current power supply, D2 is connected to the other end of C2 and the alternating current power supply, a switching tube is connected and then is connected with Q3, the Q3 is connected with one end of L1 and D3, an anode of the D3 is connected with one end of C3 and R0, anodes of the D1 and the D2 are connected with the other end of the L1 and the C3 and connected with a positive electrode of an LED, a negative electrode of the LED is connected with the other end of the R0, an output end of an MCU (micro-programmed control unit)/DSP (digital signal processor) is respectively outputted to base electrodes of the Q1, Q2 and the Q3, one end of the R0 connected the D3 is connected with an analog grounding end of the MCU/DSP, and a positive electrode of an LED illuminating lamp and the other end of the R0 is connected to an analog-digital input end of the MCU/DSP. The PFC changing circuit has the advantages of simple structure, low cost, small heating value, easiness in maintenance and long service life, and is suitable for application of the LED illuminating lamp driven by alternating current.
Description
Technical field
What the present invention relates to is the PFC translation circuit of a kind of alternating current driving LED white-light illuminating in electrical equipment control field.
Background technology
In the adjustable equipment of input voltage wide region, when especially high voltage is imported,, just must use converter with buck characteristic in order to obtain suitable busbar voltage.Tandem type Buck-Boost pfc circuit because have less voltage and current stress, is highly suitable for wide-range voltage and imports especially high voltage input occasion.
But tandem type Buck-Boost pfc circuit is made up of bridge rectifier box Buck-Boost converter, always has four semiconductor devices to be in conducting state at any one time in the circuit.Along with the raising of inverter power grade and switching frequency, the on-state loss of system significantly increases, and whole efficiency reduces.
Summary of the invention
In order to realize that existing LED lamp uses the problem that exchanges 220 volts of electricity power supplies, the present invention proposes a kind of PFC translation circuit of alternating current driving LED white-light illuminating.This circuit realizes that through in converter, regulating continuously and the conducting of controlling diode and switching tube the LED illuminating lamp directly uses the technical problem that exchanges 220 volts of electricity power supplies.
The scheme that technical solution problem of the present invention is adopted is:
The first switching tube Q1 collector electrode is connected on the first diode D1 negative electrode, first capacitor C, 1 one ends simultaneously, connects AC power one end; Its collector electrode of second switch pipe is connected on diode D2 negative electrode, second capacitor C, 2 one ends simultaneously, connects the other end of AC power; After the emission collection of switching tube connects, connect the collector electrode of the 3rd switching tube Q3, the emission collection of the 3rd switching tube Q3 connects an end of inductance L 1 and the moon collection of Xiao Jite diode D3; The anode of Xiao Jite diode connects the end of the 3rd electric capacity D3 and the end of inspection leakage resistance R0; The anode of the first diode D1 and the second diode D2 connects the other end of inductance L 1 and the 3rd capacitor C 3, connects the positive pole of great power LED simultaneously; The negative pole of LED connects the other end of inspection leakage resistance R0; The PWM output of microcontroller MCU/DSP outputs to the base stage of the first switching tube Q1, second switch pipe Q2 and the 3rd switching tube Q3 respectively; Inspection leakage resistance R0 asks 3 ends that link to be connected to the analogue ground of microcontroller MCU/DSP with the 3rd switching tube, the LED illuminating lamp just collect the other end with inspection leakage resistance R0 as detecting the modulus input that input is connected to microcontroller MCU/DSP.
Good effect, the present invention can be directly changed into direct current of voltage regulation with alternating current under the prerequisite that does not need full-bridge rectification, and has only three diode component conductings in the circuit at any one time, and efficient is significantly improved.And has an advantage simple in structure, cheap for manufacturing cost, that caloric value is little, easy maintenance, life-span are long.Suitable LED illuminating lamp uses in the conversion of alternating current 220V electricity power supply circuits and uses.
Description of drawings
Fig. 1 is an electrical block diagram of the present invention
Among the figure, MCU/DSP. microcontroller, Q1. first switching tube, Q2. second switch pipe; Q3. the 3rd switching tube, D1. first diode, D2. second diode, D3. Xiao Jite diode; C1. first electric capacity, C2. second electric capacity, C3. the 3rd electric capacity; L. inductance, R0. examines leakage resistance, LED. illuminating lamp.
Embodiment
Shown in figure, circuit constitutes and is connected:
The first switching tube Q1 collector electrode is connected on the first diode D1 negative electrode, first capacitor C, 1 one ends simultaneously, connects AC power one end; Its collector electrode of second switch pipe is connected on diode D2 negative electrode, second capacitor C, 2 one ends simultaneously, connects the other end of AC power; After the emission collection of switching tube connects, connect the collector electrode of the 3rd switching tube Q3, the emission collection of the 3rd switching tube Q3 connects an end of inductance L 1 and the moon collection of Xiao Jite diode D3; The anode of Xiao Jite diode connects the end of the 3rd electric capacity D3 and the end of inspection leakage resistance R0; The anode of the first diode D1 and the second diode D2 connects the other end of inductance L 1 and the 3rd capacitor C 3, connects the positive pole of great power LED simultaneously; The negative pole of LED connects the other end of inspection leakage resistance R0; The PWM output of microcontroller MCU/DSP outputs to the base stage of the first switching tube Q1, second switch pipe Q2 and the 3rd switching tube Q3 respectively; Inspection leakage resistance R0 asks 3 ends that link to be connected to the analogue ground of microcontroller MCU/DSP with the 3rd switching tube, the LED illuminating lamp just collect the other end with inspection leakage resistance R0 as detecting the modulus input that input is connected to microcontroller MCU/DSP.
Operation principle:
Microcontroller MCU/DSP accomplishes the positive-negative half-cycle and the zero passage detection of alternating voltage,
When input voltage was positive half cycle, microcontroller was controlled the first switching tube Q1 through the PWM0 holding wire and is enabled, and after Buck-Boost circuit and load, formed the loop through the second diode D2; When input voltage was negative half period, microcontroller enabled through PWM1 holding wire control switch pipe Q2, after Buck-Boost circuit and load, formed the loop through the first diode D1;
The AD test side of microcontroller MCU/DSP is received the voltage output end of Buck-Boost circuit and the anode of inspection leakage resistance R0 respectively; Form the closed control circuit of constant current; Promptly as the voltage AD1 that detects leakage resistance R0 two ends during greater than the constant voltage of constant current and the product of inspection leakage resistance RO; Reduce the semaphore of PWM3; As the voltage AD1 that detects leakage resistance R0 two ends during less than the constant voltage of constant current and the product of inspection leakage resistance RO, increase the semaphore of PWM3, form the constant-current driving of great power LED.
AD0 is the test side of Buck-Boost output voltage, also has the detection and the output protection effect such as overcurrent, overload of great power LED simultaneously.
The operation principle of Buck-Boost circuit is: when the 3rd switching tube Q3 is closed, and inductance L 1 charging, 3 discharges of the 3rd capacitor C, driving LED illuminating lamp; When the 3rd electric capacity Q3 breaks off, 3 chargings of the 3rd electric capacity capacitor C, while driving LED illuminating lamp, its voltage output and voltage input, and the relation of the break-make duty ratio of switching tube is: Vo=-Vi (D/ (1-D)); The size of inductance L 1 depends on the operating frequency of the 3rd switching tube Q3 and the size of load current; The operating frequency of the 3rd switching tube Q3 also has influence on the type selecting of Xiao Jitedi three diode D3 simultaneously.
The present invention can solve high-power LED white illumination driving voltage converter always has four semiconductors to be in conducting state in the circuit at any one time; Raising along with inverter power grade and switching frequency; The problem that exist the on-state loss of system significantly to increase, whole efficiency reduces, caloric value increases is for importing continuously adjustable no bridge Buck-Boost pfc converter.
Claims (1)
1. the PFC translation circuit of an alternating current driving LED white-light illuminating is characterized in that: circuit constitutes and is connected:
The first switching tube Q1 collector electrode is connected on the first diode D1 negative electrode, first capacitor C, 1 one ends simultaneously, connects AC power one end; Its collector electrode of second switch pipe is connected on diode D2 negative electrode, second capacitor C, 2 one ends simultaneously, connects the other end of AC power; After the emission collection of switching tube connects, connect the collector electrode of the 3rd switching tube Q3, the emission collection of the 3rd switching tube Q3 connects an end of inductance L 1 and the moon collection of Xiao Jite diode D3; The anode of Xiao Jite diode connects the end of the 3rd electric capacity D3 and the end of inspection leakage resistance R0; The anode of the first diode D1 and the second diode D2 connects the other end of inductance L 1 and the 3rd capacitor C 3, connects the positive pole of great power LED simultaneously; The negative pole of LED connects the other end of inspection leakage resistance R0; The PWM output of microcontroller MCU/DSP outputs to the base stage of the first switching tube Q1, second switch pipe Q2 and the 3rd switching tube Q3 respectively; Inspection leakage resistance R0 asks 3 ends that link to be connected to the analogue ground of microcontroller MCU/DSP with the 3rd switching tube, the LED illuminating lamp just collect the other end with inspection leakage resistance R0 as detecting the modulus input that input is connected to microcontroller MCU/DSP.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210129475.1A CN102684516B (en) | 2012-04-28 | 2012-04-28 | Alternating current driven PFC (power factor correction) changing circuit for LED white-light illumination |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210129475.1A CN102684516B (en) | 2012-04-28 | 2012-04-28 | Alternating current driven PFC (power factor correction) changing circuit for LED white-light illumination |
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| Publication Number | Publication Date |
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| CN102684516A true CN102684516A (en) | 2012-09-19 |
| CN102684516B CN102684516B (en) | 2015-04-15 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101599695A (en) * | 2009-07-03 | 2009-12-09 | 中兴通讯股份有限公司 | Bridgeless power factor circuit correcting circuit and control method thereof |
| CN101883468A (en) * | 2009-05-04 | 2010-11-10 | 海洋王照明科技股份有限公司 | Control circuit of fluorescent lamp and control method |
| US8004861B2 (en) * | 2009-04-16 | 2011-08-23 | Fsp Technology Inc. | Parameter configuration method for elements of power factor correction function converter |
| CN102263492A (en) * | 2010-05-28 | 2011-11-30 | 瑞萨电子株式会社 | Semiconductor device and power supply device |
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2012
- 2012-04-28 CN CN201210129475.1A patent/CN102684516B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8004861B2 (en) * | 2009-04-16 | 2011-08-23 | Fsp Technology Inc. | Parameter configuration method for elements of power factor correction function converter |
| CN101883468A (en) * | 2009-05-04 | 2010-11-10 | 海洋王照明科技股份有限公司 | Control circuit of fluorescent lamp and control method |
| CN101599695A (en) * | 2009-07-03 | 2009-12-09 | 中兴通讯股份有限公司 | Bridgeless power factor circuit correcting circuit and control method thereof |
| CN102263492A (en) * | 2010-05-28 | 2011-11-30 | 瑞萨电子株式会社 | Semiconductor device and power supply device |
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| CN102684516B (en) | 2015-04-15 |
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Granted publication date: 20150415 Termination date: 20190428 |