CN103607816A - LED power source with synchronous rectification - Google Patents
LED power source with synchronous rectification Download PDFInfo
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- CN103607816A CN103607816A CN201310563029.6A CN201310563029A CN103607816A CN 103607816 A CN103607816 A CN 103607816A CN 201310563029 A CN201310563029 A CN 201310563029A CN 103607816 A CN103607816 A CN 103607816A
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Abstract
The invention relates to an LED power source with synchronous rectification. The LED power source comprises a rectifier module, a DC-DC conversion module and a constant-current voltage-limiting control module with synchronous rectification. An external alternating-current power supply is connected with the input terminal of the rectifier module; the output terminal of rectifier module is connected with the input terminal of the DC-DC conversion module; the output terminal of the DC-DC conversion module is connected with the input terminal of the constant-current voltage-limiting control module with synchronous rectification; and the output terminal of the constant-current voltage-limiting control module with synchronous rectification is connected with an LED light source. According to the invention, a secondary rectification circuit is changed from a traditional rectifier diode circuit into a circuit with synchronous rectification, thereby improving the conversion efficiency of the driving power supply; and the heating value is reduced.
Description
Technical field
The present invention relates to a kind of LED lamp power supply, especially a kind of LED power supply with synchronous rectification.
Background technology
LED, as a kind of brand-new lighting system, has the life-span long, consumes energy low, and without mercury pollution, the remarkable advantages such as applying flexible, development prospect is wide.
The traditional Switching Power Supply conceptual design circuit of the general employing of existing LED power supply, secondary commutation adopts passive device diode rectification, rectifier diode VF value is generally more than 0.7V, cause on rectifier diode loss very large, diode heating is serious, in large power supply more than output 3A, the loss on rectifier diode even can account for the 30%-50% of whole driving power loss, has a strong impact on the operating efficiency of whole power supply.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of LED power supply with synchronous rectification is provided.
According to technical scheme provided by the invention:
With a LED power supply for synchronous rectification, it comprises a rectification module, a DC-DC modular converter and a constant current voltage limiting control module with synchronous rectification, and extraneous AC power is connected with the input of described rectification module; The output of rectification module is connected with the input of DC-DC modular converter; The output of DC-DC modular converter is connected with the input of constant current voltage limiting control module with synchronous rectification; Output with the constant current voltage limiting control module of synchronous rectification is connected with LED light source.
Described rectification module comprises a rectification circuit, and extraneous AC power is connected with the input of described rectification circuit, and the output of rectification circuit is connected with the input of DC-DC modular converter.
Further, described rectification module also comprises an EMI/EMC circuit, and extraneous AC power is connected with described rectification circuit after by described EMI/EMC circuit, and the output of rectification circuit is connected with the input of DC-DC modular converter.
Further, described rectification circuit is bridge rectifier.
Described DC-DC modular converter comprises a High Power Factor anti exciting converter and a transformer, after the reduction voltage circuit that the output of rectification module consists of with described transformer described High Power Factor anti exciting converter, is connected with the input of the described constant current voltage limiting control module with synchronous rectification.
The described constant current voltage limiting control module with synchronous rectification comprises that one with the constant current voltage limiting control circuit of synchronous rectification, and the output of described DC-DC modular converter is connected with LED light source after by the described constant current voltage limiting control circuit with synchronous rectification.
Further, the described constant current voltage limiting control module with synchronous rectification also comprises one group of common mode filtering inductance, and the output of described DC-DC modular converter is connected with LED light source by common mode filtering inductance after by the described constant current voltage limiting control circuit with synchronous rectification.
The invention has the beneficial effects as follows:
Novelty by traditional rectifier diode circuit, change secondary commutation circuit into synchronous rectification, improved driving power conversion efficiency, and reduced caloric value.
Accompanying drawing explanation
Fig. 1 is circuit block diagram of the present invention.
Fig. 2 is circuit theory diagrams of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
As shown in Figure 1: according to functional module, divide, the present invention includes connected successively rectification module, DC-DC modular converter and with the constant current voltage limiting control module of synchronous rectification, extraneous power supply is connected with the input of rectification module, with the output of the constant current voltage limiting control module of synchronous rectification, is connected with LED light source.
As shown in Figure 2, a physical circuit based on module described in Fig. 1, is a single-ended flyback circuit.
The input of selection alternating current 220V, the LED illumination of constant current output, comprises following part.
1, EMI/EMC circuit.Prevent extraneous and controller electromagnetic interference each other.
2, bridge rectifier.For changing interchange input into direct current Vbus1.
3, Switching Power Supply conversion chip L6562A and peripheral circuit.
4, transformer.For high voltage direct current Vbus1 is become to low-voltage direct Vs.
5, with the constant current voltage limiting chip TEA1761 of synchronous rectification.Have synchronous rectification, and have electric current loop and Voltage loop simultaneously, make output constant current, output voltage limits within the specific limits simultaneously.
Described EMI/EMC circuit input 220V exchanges.Rectification module comprises that the first inductance L 1, the first filter capacitor CX1, the second filter capacitor CX2, the first inductance L 1, rectifier bridge BD1 and the first capacitor C 1, the first filter capacitor CX1 are connected in parallel on extraneous alternating current input; The second filter capacitor CX2 is connected in parallel on two inputs of rectifier bridge BD1; The first inductance L 1 is connected between the first filter capacitor CX1 and the second filter capacitor CX2; The first capacitor C 1 is connected between two outputs of rectifier bridge BD1; Rectification module output high level Vbus1.At input, be also parallel with a piezo-resistance VR1 and prevent thunderbolt.Inductance L 1, capacitor C X1, CX2, strobes.The rectifier bridge BD1 of bridge rectifier module becomes interchange input into direct current Vbus1, and Vbus1 waveform is half sine-wave formula.The first capacitor C 1 adopts solid capacitor, preferably CBB electric capacity.
The described Switching Power Supply DC-DC modular converter with Active PFC comprises L6562A chip IC 1, the Vcc1 of L6562A chip IC 1 meets the high level Vbus1 of bridge rectifier module output, the OUT pin of L6562A chip IC 1 connects the first metal-oxide-semiconductor Q1 grid, the first metal-oxide-semiconductor Q1 drain electrode meets the high level Vbus1 of bridge rectifier module output by transformer main winding NP, the CS pin of the first metal-oxide-semiconductor Q1 source electrode and L6562A chip IC 1 is by the first resistance R 1 ground connection, the auxiliary winding Na of transformer one end ground connection, the other end connects described Vcc1 pin by the first diode D1, the INV pin of L6562A chip IC 1 is connected with the described constant current voltage limiting control module with synchronous rectification by opto-coupler chip.
The described constant current voltage limiting control circuit with synchronous rectification comprises TEA1761 chip IC 2, transformer secondary output winding Ns one end connects the drain electrode of the second metal-oxide-semiconductor Q2, and with the SRSENSE pin of crossing the second resistance R 2 connection TEA1761 chip IC 2, the transformer secondary output winding Ns other end provides direct voltage Vs, and connect Vcc2 pin and the 3rd resistance R 3 of TEA1761 chip IC 2, the 3rd other one end of resistance R 3 connects the VSENSE pin of TEA1761 chip IC 2, the VSENSE pin of TEA1761 chip IC 2 is by the 4th resistance R 4 ground connection, the ISENSE pin of TEA1761 chip IC 2 is by the 5th resistance R 5 ground connection, the DRIVER pin of TEA1761 chip IC 2 connects the grid of the second metal-oxide-semiconductor Q2, the GND pin of TEA1761 chip IC 2 and the source ground of the second metal-oxide-semiconductor Q2, described direct voltage Vs and ISENSE pin are powered to LED light source by being connected on the common mode filtering inductance L 2 at LED light source two ends.
L6562A is by the tracking to Vbus1 waveform after rectification, and camera triggers the first metal-oxide-semiconductor Q1, the DC-DC conversion of control transformer.The auxiliary winding Naux of transformer is to L6562A chip power supply.
TEA1761, Q2, R2, R3, R4 and R5 form secondary synchronization rectification circuit.Output voltage V out and electric current are controlled by TEA1761T, and are connected to primary control device through optical coupler IC3.Output voltage is set by R3 and R4, and output current is controlled by resistance R 5.The opening and closing of synchronous rectifier switch Q2 realize by the voltage sensing on TEA1761 pin SRSENSE.Resistance R 2 use do excess voltage to protect.
Flow through the electric current of LED, by R5, sampled and delivered to ISENSE pin, TEA1761 internal comparator forms electric current loop, makes the voltage constant of ISENSE pin at 0.05V, like this output current Iout=0.05V/R5.Vout voltage and Vs voltage are almost equal, and by R3, VSENSE pin is delivered in R4 sampling, and TEA1761 internal comparator forms Voltage loop, makes VSENSE pin voltage must not surpass 2.5V, like this Vout=Vs<2.5 * (R4+R5)/R5+0.7.
Thereby improved driving power conversion efficiency, and reduced caloric value.
The part that the present invention does not relate to all prior art that maybe can adopt same as the prior art is realized.
Claims (7)
1. with a LED power supply for synchronous rectification, it is characterized in that it comprises a rectification module, a DC-DC modular converter and a constant current voltage limiting control module with synchronous rectification, extraneous AC power is connected with the input of described rectification module; The output of rectification module is connected with the input of DC-DC modular converter; The output of DC-DC modular converter is connected with the input of constant current voltage limiting control module with synchronous rectification; Output with the constant current voltage limiting control module of synchronous rectification is connected with LED light source.
2. a kind of LED power supply with synchronous rectification according to claim 1, it is characterized in that described rectification module comprises a rectification circuit, extraneous AC power is connected with the input of described rectification circuit, and the output of rectification circuit is connected with the input of DC-DC modular converter.
3. a kind of LED power supply with synchronous rectification according to claim 2, it is characterized in that described rectification module also comprises an EMI/EMC circuit, extraneous AC power is connected with described rectification circuit after by described EMI/EMC circuit, and the output of rectification circuit is connected with the input of DC-DC modular converter.
4. according to a kind of LED power-switching circuit with synchronous rectification described in claim 2 or 3, it is characterized in that described rectification circuit is bridge rectifier.
5. a kind of LED power supply with synchronous rectification according to claim 1, it is characterized in that described DC-DC modular converter comprises a High Power Factor anti exciting converter and a transformer, after the reduction voltage circuit that the output of rectification module consists of with described transformer described High Power Factor anti exciting converter, be connected with the input of the described constant current voltage limiting control module with synchronous rectification.
6. a kind of LED power supply with synchronous rectification according to claim 1, it is characterized in that the described constant current voltage limiting control module with synchronous rectification comprises that one with the constant current voltage limiting control circuit of synchronous rectification, the output of described DC-DC modular converter is connected with LED light source after by the described constant current voltage limiting control circuit with synchronous rectification.
7. a kind of LED power supply with synchronous rectification according to claim 6, it is characterized in that the described constant current voltage limiting control module with synchronous rectification also comprises one group of common mode filtering inductance, the output of described DC-DC modular converter is connected with LED light source by common mode filtering inductance after by the described constant current voltage limiting control circuit with synchronous rectification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310563029.6A CN103607816A (en) | 2013-11-13 | 2013-11-13 | LED power source with synchronous rectification |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310563029.6A CN103607816A (en) | 2013-11-13 | 2013-11-13 | LED power source with synchronous rectification |
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| CN103607816A true CN103607816A (en) | 2014-02-26 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100109571A1 (en) * | 2007-01-30 | 2010-05-06 | Panasonic Electric Works Co., Ltd. | Insulation type ac-dc converter and led dc power supply device using the same |
| CN201774717U (en) * | 2010-08-26 | 2011-03-23 | 佛山市顺德区瑞德电子实业有限公司 | SCR resonance half-bridge based LED streetlamp drive power circuit |
| CN201774716U (en) * | 2010-08-16 | 2011-03-23 | 上海新华电子设备有限公司 | Constant-current driving power source for LED illumination |
| CN202310188U (en) * | 2011-09-08 | 2012-07-04 | 东莞乐域塑胶电子制品有限公司 | Driving power supply of LED lamp |
| CN203554764U (en) * | 2013-11-13 | 2014-04-16 | 江苏宏力光电科技有限公司 | LED power supply with synchronization rectification |
-
2013
- 2013-11-13 CN CN201310563029.6A patent/CN103607816A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100109571A1 (en) * | 2007-01-30 | 2010-05-06 | Panasonic Electric Works Co., Ltd. | Insulation type ac-dc converter and led dc power supply device using the same |
| CN201774716U (en) * | 2010-08-16 | 2011-03-23 | 上海新华电子设备有限公司 | Constant-current driving power source for LED illumination |
| CN201774717U (en) * | 2010-08-26 | 2011-03-23 | 佛山市顺德区瑞德电子实业有限公司 | SCR resonance half-bridge based LED streetlamp drive power circuit |
| CN202310188U (en) * | 2011-09-08 | 2012-07-04 | 东莞乐域塑胶电子制品有限公司 | Driving power supply of LED lamp |
| CN203554764U (en) * | 2013-11-13 | 2014-04-16 | 江苏宏力光电科技有限公司 | LED power supply with synchronization rectification |
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Application publication date: 20140226 |