CN102665322A - Driving power supply without electrolytic capacitor - Google Patents
Driving power supply without electrolytic capacitor Download PDFInfo
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- CN102665322A CN102665322A CN2012100968329A CN201210096832A CN102665322A CN 102665322 A CN102665322 A CN 102665322A CN 2012100968329 A CN2012100968329 A CN 2012100968329A CN 201210096832 A CN201210096832 A CN 201210096832A CN 102665322 A CN102665322 A CN 102665322A
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Abstract
The invention discloses an LED driving power supply without an electrolytic capacitor, belonging to the field of LED driving power supply. The LED driving power supply comprises a commercial power rectification circuit, a PFC circuit, a DC/DC circuit, a bidirectional converter, a ceramic capacitor, and a digital control circuit, wherein after a commercial power signal is subjected to rectification by the commercial power rectification circuit, the signal is inputted into the PFC circuit. The PFC circuit accesses the ceramic capacitor. The DC/DC circuit and the bidirectional converter are in parallel connection with the ceramic capacitor respectively. The DC/DC circuit accesses the LED load. The LED load outputs a current sampling signal to the digital control circuit. The digital control circuit controls the PFC circuit, the DC/DC circuit and the bidirectional converter respectively. According to the driving power supply, the ceramic capacitor is used to replace the electrolytic capacitor, and the power supply has the advantages of a long service life, small volume, good ripple performance and good PFC performance.
Description
Technical field
The invention belongs to a kind of driving power, particularly belong to the LED driving power.
Background technology
Along with the development of LED, also increasingly high to the requirement of LED driving power, high-performance, high reliability, the long-life is a LED driving power key for design characteristic.
Can reach 30,000～100,000 hours the useful life of LED, contain electrochemical capacitor in traditional LED driving power, and there is following shortcoming in electrochemical capacitor:
Life-span shorter, be about 5000 hours, and volume is bigger.
2. electrolyte leakage can take place in electrochemical capacitor.
3. electrochemical capacitor runs down with the rising performance of ambient temperature.
4. the heat resistance of electrochemical capacitor and shock-resistant new ability are very poor, have reduced reliability.
The self character of electrochemical capacitor has caused LED and unmatched problem of driving power life-span.
In order to overcome the above problems, can adopt ceramic condenser directly to replace electrochemical capacitor.The life-span of ceramic condenser will be far above electrochemical capacitor, and the volume of ceramic condenser is less.But this method of using ceramic condenser to replace electrochemical capacitor is cost to sacrifice ripple performance and PFC performance.Simultaneously, with regard to the selection of ceramic condenser size, ripple greatly then corresponding capacitance can reduce, but excessive ripple causes problems such as system's instability and stroboscopic, therefore needs the size of choose reasonable ceramic condenser.
Summary of the invention
The objective of the invention is to directly replace the deficiency of the type of drive of electrochemical capacitor with ceramic condenser, a kind of LED driving power of no electrolytic capacitor of the use ceramic condenser that has good ripple performance and PFC performance simultaneously is provided to above.
In order to realize above-mentioned target; The technical scheme that the present invention adopts is: a kind of LED driving power of no electrolytic capacitor; Comprise commercial power rectification circuit, pfc circuit, DC/DC circuit, reversible transducer, ceramic condenser, digital control circuit; Wherein city's signal of telecommunication is imported pfc circuit after through commercial power rectification circuit rectification, and it is parallelly connected with ceramic condenser respectively to insert ceramic condenser, DC/DC circuit and reversible transducer behind the pfc circuit, inserts the LED load behind the DC/DC circuit; LED load output current sampled signal is given digital control circuit, and digital control circuit is controlled pfc circuit, DC/DC circuit and reversible transducer respectively.
Above-mentioned technical scheme can also further be optimized for: said pfc circuit is the Boost circuit, comprises first switching tube, first diode, first inductance, and said ceramic condenser is connected between the first diode negative terminal and the pfc circuit power supply negative terminal.
Above-mentioned technical scheme can also further be optimized for: said commercial power rectification circuit is a rectifier bridge.
Above-mentioned technical scheme can also further be optimized for: said DC/DC circuit is the anti exciting converter circuit, comprises second switch pipe, transformer, second diode, anti exciting converter electric capacity.
Above-mentioned technical scheme can also further be optimized for: said reversible transducer comprises the 3rd switching tube, the 4th switching tube, the 3rd diode, the 4th diode, reversible transducer inductance, reversible transducer electric capacity.
Above-mentioned technical scheme can also further be optimized for: said digital control circuit comprises A/D modular converter, digital control module, PWM modulation module and driver module; The current sampling signal of LED load output outputs to digital control module through the A/D modular converter; Digital control module output digital controlled signal is to the PWM modulation module; PWM modulation module output PWM modulation signal is to driver module, and the driver module output drive signal is controlled pfc circuit, DC/DC circuit and reversible transducer respectively.
Above-mentioned technical scheme can also further be optimized for: said digital control module is DSP control circuit or single chip machine controlling circuit.
Above-mentioned technical scheme can also further be optimized for: also comprise protective circuit, be used to provide overvoltage protection, overheat protector.
Is cost because of ceramic condenser replaces electrochemical capacitor with the PFC performance, so the LED driving power of this no electrolytic capacitor employing two-stage type type of drive, and two-stage type drives can realize Active PFC and constant current output in full voltage range.Prime is a pfc circuit, and the back level is the DC/DC circuit.
Pfc circuit selects for use the Boost circuit as main circuit, regulates power factor (PF), makes electric current floating voltage all the time, makes power factor (PF) level off to 1.This circuit working is under the CCM pattern.
The input power and the power output of ceramic condenser balance pfc circuit, the size of average voltage and voltage max decision ceramic condenser.
Reversible transducer is parallelly connected with ceramic condenser, as drawing and introduce the frequency multiplication ripple, and balance input and output power simultaneously, its effect that acts on storage capacitor is similar.
The DC/DC circuit selects for use anti exciting converter as main circuit, through regulating the duty cycle adjustment output voltage, guarantees constant-current driving LED.Anti exciting converter is operated under the DCM pattern, makes the switching tube soft start, avoids the impact to switching tube of current spike and surge voltage.
Digital control circuit comprises A/D modular converter, digital control module, PWM modulation module and driver module, through digital control pfc circuit, DC/DC circuit and the reversible transducer controlled respectively.Convert analog quantity into digital quantity, realize the control of signal according to digital control method.Digital control circuit provides PWM modulation signal simultaneously, converts drive signal control pfc circuit, DC/DC circuit and reversible transducer into through drive circuit.
Beneficial effect of the present invention is: in traditional electrochemical capacitor LED driving power, electrochemical capacitor mainly plays filtering and energy storage.In the present invention, replace electrochemical capacitor to play the effect of filtering high frequency ripple with ceramic condenser, but can not replace the energy storage effect of electrochemical capacitor.Therefore the parallel connection reversible transducer in the ceramic condenser rear end, balance input and output power.Ceramic condenser can absorb the reverse high frequency ripple that flows out of reversible transducer again simultaneously.Through replacing electrochemical capacitor with ceramic condenser, and at the ceramic condenser two ends mode of parallel connection reversible transducer, prolonged life-span of LED driving power, reduce LED driving power volume.Use pfc circuit simultaneously, can effectively promote the PFC performance of this circuit.
Description of drawings
Fig. 1 is the circuit theory diagrams of the LED driving power of no electrolytic capacitor.
Fig. 2 is input voltage and input current and power output oscillogram.
Fig. 3 is the LED driving power PFC and the DC/DC circuit connection diagram of no electrolytic capacitor.
Fig. 4 is the reversible transducer circuit theory diagrams.
Fig. 5 is the pfc circuit schematic diagram.
Fig. 6 is the DC/DC circuit theory diagrams.
Embodiment
Below in conjunction with accompanying drawing and instantiation the present invention is described in further detail.
As shown in Figure 1, the LED driving power of no electrolytic capacitor of the present invention comprises commercial power rectification circuit, pfc circuit, ceramic condenser C
b, reversible transducer, DC/DC circuit, digital control circuit, protective circuit.
Civil power not rectification circuit is made up of four rectifier diode D5, D6, D7, D8.Pfc circuit comprises the first switching tube Q1, the first diode D1, first inductance L 1.First inductance L, 1 anode connects the pfc circuit power positive end, and the first diode D1 anode connects the drain electrode of the first switching tube Q1, and the first diode D1 and the drain electrode of the first switching tube Q1 are connected the negative terminal of first inductance L 1 respectively.Pfc circuit is operated in the CCM pattern, guarantees in the total power scope, to regulate.
Ceramic condenser C
bAfter inserting pfc circuit, the first diode D1 negative terminal and ceramic condenser C
bConnect ceramic condenser C
bThe other end and the first switching tube Q1 source electrode connect the pfc circuit power supply negative terminal simultaneously.Ceramic condenser C
bThe filtering high frequency ripple, the peak value of reduction LED drive current.The ceramic condenser size is selected:
Δ E is constant capacitive energy pulsation, and Vc is ceramic condenser C
bThe voltage of end.
Suppose that the capacitive energy pulsation is constant, ceramic condenser C
bSize by pfc circuit output average voltage and the decision of ripple voltage maximum, ripple voltage is big more, then ceramic condenser C
bMore little, but the corresponding increase of voltage max meeting this moment is had higher requirement to the energy storage of ceramic condenser.Therefore, voltage max and average voltage must be controlled within the specific limits, guarantee that the ceramic condenser filtering performance can both satisfy LED stabilized driving condition.
Ceramic condenser C
bThe filtering high frequency ripple also needs balance input and output power device, i.e. energy storage simultaneously.As shown in Figure 2, be the input voltage and input current of system and the oscillogram of power output, input voltage and input current is power frequency sine wave, LED-based constant voltage load characteristic, output voltage should be straight voltage, so there is the power frequency energy of twice in system, with ceramic condenser C
bParallelly connected with reversible transducer, balance input and output power.
As shown in Figure 4, reversible transducer is the Buck-Boost structure, comprises the 3rd switching tube Q3, the 4th switching tube Q4, the 3rd diode D3, the 4th diode D4, reversible transducer inductance, reversible transducer electric capacity.From ceramic condenser C
bSide is operated in the Buck pattern to the reversible transducer capacitive side, is defined as pattern 1.From the reversible transducer capacitive side to ceramic condenser side C
bBe operated in the Boost pattern, be defined as pattern 2.When introducing the frequency multiplication electric current, the 3rd switching tube Q3 work.When the reversible transducer energy is injected driving power, the 4th switching tube Q4 work.When reversible transducer was operated in pattern 1, the current i s that flows into reversible transducer was the twice power current in the pfc circuit output current.Can be through current transformer sampling PFC output current, then through filter circuit and capacitance sampling twice power current component.When reversible transducer is operated in pattern 2, ceramic condenser C
bBut absorbing high-frequency ripple component.
Ceramic condenser C
bThe back level inserts the DC/DC circuit, and the DC/DC circuit comprises second switch pipe Q2, transformer, the second diode D2, anti exciting converter electric capacity.Through regulating the duty ratio of DC/DC circuit, regulate output voltage, thereby further regulate the driving LED electric current.The DC/DC circuit working makes that in the DCM pattern switching tube is a soft start, reduces turn-on consumption, avoids current spike and surge voltage.
Digital control circuit comprises A/D modular converter, digital control module, PWM modulation module and driver module, through digital control pfc circuit, DC/DC circuit and the reversible transducer controlled respectively.Convert analog quantity into digital quantity, realize the control of signal according to digital control method.Digital control circuit provides PWM modulation signal simultaneously, converts drive signal control pfc circuit, DC/DC circuit and reversible transducer into through drive circuit.It is digital control to select for use DSP or single-chip microcomputer to carry out, and the selection of control chip is not specified, selects according to the actual requirements.
Though the present invention is with preferred embodiment openly as above, embodiment and accompanying drawing be not be used for limiting of the present invention.In spirit that does not break away from the present invention and scope, any equivalence of being done changes or retouching, belongs to the present invention's protection range equally.Therefore protection scope of the present invention should be standard with the application's the content that claim was defined.
Claims (8)
1. the driving power of a no electrolytic capacitor; It is characterized in that: comprise commercial power rectification circuit, pfc circuit, DC/DC circuit, reversible transducer, ceramic condenser, digital control circuit; Wherein city's signal of telecommunication is imported pfc circuit after through commercial power rectification circuit rectification; It is parallelly connected with ceramic condenser respectively to insert ceramic condenser, DC/DC circuit and reversible transducer behind the pfc circuit; Insert the LED load behind the DC/DC circuit, LED load output current sampled signal is given digital control circuit, and digital control circuit is controlled pfc circuit, DC/DC circuit and reversible transducer respectively.
2. the driving power of no electrolytic capacitor according to claim 1; It is characterized in that: said pfc circuit is the Boost circuit; Comprise first switching tube, first diode, first inductance, said ceramic condenser is connected between the first diode negative terminal and the pfc circuit power supply negative terminal.
3. the driving power of no electrolytic capacitor according to claim 1, it is characterized in that: said commercial power rectification circuit is a rectifier bridge.
4. the driving power of no electrolytic capacitor according to claim 1, it is characterized in that: said DC/DC circuit is the anti exciting converter circuit, comprises second switch pipe, transformer, second diode, anti exciting converter electric capacity.
5. the driving power of no electrolytic capacitor according to claim 1, it is characterized in that: said reversible transducer comprises the 3rd switching tube, the 4th switching tube, the 3rd diode, the 4th diode, reversible transducer inductance, reversible transducer electric capacity.
6. the driving power of no electrolytic capacitor according to claim 1; It is characterized in that: said digital control circuit comprises A/D modular converter, digital control module, PWM modulation module and driver module; The current sampling signal of LED load output outputs to digital control module through the A/D modular converter; Digital control module output digital controlled signal is to the PWM modulation module; PWM modulation module output PWM modulation signal is to driver module, and the driver module output drive signal is controlled pfc circuit, DC/DC circuit and reversible transducer respectively.
7. the driving power of no electrolytic capacitor according to claim 6, it is characterized in that: said digital control module is DSP control circuit or single chip machine controlling circuit.
8. according to the driving power of the arbitrary described no electrolytic capacitor of claim 1 ~ 6, it is characterized in that: also comprise protective circuit, be used to provide overvoltage protection, overheat protector.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210096832.9A CN102665322B (en) | 2012-03-30 | 2012-03-30 | Driving power supply without electrolytic capacitor |
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| CN201210096832.9A CN102665322B (en) | 2012-03-30 | 2012-03-30 | Driving power supply without electrolytic capacitor |
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| CN102665322A true CN102665322A (en) | 2012-09-12 |
| CN102665322B CN102665322B (en) | 2014-06-11 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103152931A (en) * | 2013-02-25 | 2013-06-12 | 南京航空航天大学 | LED (light emitting diode) driving power supply with high power factor and without electrolytic capacity |
| CN103346684A (en) * | 2013-07-18 | 2013-10-09 | 南京理工大学 | Alternating current/direct current (AC/DC) converter adopting active energy-storage capacitance converter |
| CN104507238A (en) * | 2014-12-30 | 2015-04-08 | 长沙师范学院 | LED (light emitting diode) driving power supply without electrolytic capacitor |
| CN105744678A (en) * | 2016-03-11 | 2016-07-06 | 浙江大学 | PWM duty ratio control strategy-based LED driver free of electrolytic capacitor |
| CN108432110A (en) * | 2015-12-22 | 2018-08-21 | 诺乌姆工程有限公司 | DC/DC converters |
| CN109392225A (en) * | 2018-10-22 | 2019-02-26 | 南京博德新能源技术有限公司 | A kind of LED lamp drive circuit reducing output current fluctuation |
| CN111762066A (en) * | 2020-07-07 | 2020-10-13 | 深圳威迈斯新能源股份有限公司 | Low-temperature self-heating device and method for power battery and ripple suppression method |
| CN114679816A (en) * | 2021-12-31 | 2022-06-28 | 福州大学 | Intermediate capacitor current control method for electrolytic capacitor-free single-stage LED drive circuit |
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Cited By (11)
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| CN103346684A (en) * | 2013-07-18 | 2013-10-09 | 南京理工大学 | Alternating current/direct current (AC/DC) converter adopting active energy-storage capacitance converter |
| CN103346684B (en) * | 2013-07-18 | 2015-07-01 | 南京理工大学 | Alternating current/direct current (AC/DC) converter adopting active energy-storage capacitance converter |
| CN104507238A (en) * | 2014-12-30 | 2015-04-08 | 长沙师范学院 | LED (light emitting diode) driving power supply without electrolytic capacitor |
| CN108432110A (en) * | 2015-12-22 | 2018-08-21 | 诺乌姆工程有限公司 | DC/DC converters |
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| CN105744678A (en) * | 2016-03-11 | 2016-07-06 | 浙江大学 | PWM duty ratio control strategy-based LED driver free of electrolytic capacitor |
| CN109392225A (en) * | 2018-10-22 | 2019-02-26 | 南京博德新能源技术有限公司 | A kind of LED lamp drive circuit reducing output current fluctuation |
| CN111762066A (en) * | 2020-07-07 | 2020-10-13 | 深圳威迈斯新能源股份有限公司 | Low-temperature self-heating device and method for power battery and ripple suppression method |
| CN111762066B (en) * | 2020-07-07 | 2022-02-11 | 深圳威迈斯新能源股份有限公司 | Low-temperature self-heating device and method for power battery and ripple suppression method |
| CN114679816A (en) * | 2021-12-31 | 2022-06-28 | 福州大学 | Intermediate capacitor current control method for electrolytic capacitor-free single-stage LED drive circuit |
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| CN102665322B (en) | 2014-06-11 |
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