CN102984843A - Constant current LED power supply not having high-voltage electrolytic capacitor - Google Patents
Constant current LED power supply not having high-voltage electrolytic capacitor Download PDFInfo
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- CN102984843A CN102984843A CN2011102608060A CN201110260806A CN102984843A CN 102984843 A CN102984843 A CN 102984843A CN 2011102608060 A CN2011102608060 A CN 2011102608060A CN 201110260806 A CN201110260806 A CN 201110260806A CN 102984843 A CN102984843 A CN 102984843A
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Abstract
The invention relates to a constant current LED power supply not having a high-voltage electrolytic capacitor, comprising an EMI/EMC module and a bridge type rectification module connected orderly. The output of the bridge type rectification module is connected with an LED light source via a switch power supply DC-DC conversion module equipped with a power factor correction circuit and a constant current voltage limiting control module orderly. In the invention, the high-voltage electrolytic capacitor of shortest service life is canceled, so that the theory service life of a controller is prolonged to be tens of thousands of hours from being less than a ten thousand hours; by employing a circuit having a current loop and a voltage loop simultaneously, the output constant current precision can reach plus minus 1%, and the voltage is limited at the same time.
Description
Technical field
The present invention relates to a kind of LED lamp power supply, especially a kind of constant-current LED power supply without high-voltage electrolytic capacitor.
Background technology
LED has energy savings as a kind of brand-new lighting system, and the life-span is long, and without remarkable advantages such as mercury pollution, development prospect is wide.
The traditional Switching Power Supply conceptual design circuit of the general employing of existing LED power supply need to be used high-voltage electrolytic capacitor, and the control of output constant voltage.
Traditional way will exchange first input rectifying and become Vbus1, and then by special power factor correction circuit, such as L6562 etc., output direct current Vbus2 boosts.By the adjustment of L6562, because the phase angle between the AC-input voltage that non-resistive load causes and the interchange input current is contracted to 0, power factor (PF) is near 1 like this.By traditional DC-DC switching power circuit, such as TEA1552T etc., can change high voltage direct current Vbus2 into needed low-voltage direct Vs by transformer.Vs by the voltage stabilizing of TL341 etc., just obtains the needed Vout of load again.
There is following problem in traditional circuit:
1, the life-span is short.The way of conventional switch power supply need to increase in the Vbus2 back a large capacity high electrochemical capacitor voltage regulation filtering, because electrochemical capacitor is in the situation of high pressure, high temperature, electrolyte is volatile, and the life-span is short, becomes the short slab in whole controller life-span of restriction.
2, the constant current weak effect.The conventional switch power supply generally adopt constant voltage control, the LED lamp under the constant voltage, the minor fluctuations of voltage all can cause electric current than great fluctuation process.Current fluctuation is large, and namely the LED power fluctuation is larger, can cause the intensity of illumination fluctuation also large, also can affect the life-span of LED.
Summary of the invention
Goal of the invention: the objective of the invention is in order to overcome deficiency of the prior art, a kind of constant-current LED power supply without high-voltage electrolytic capacitor is provided.
Technical scheme: the constant-current LED power supply without high-voltage electrolytic capacitor of the present invention comprises EMI/EMC module, the bridge rectifier module that links to each other successively, and the output of described bridge rectifier module is connected to led light source by Switching Power Supply DC-DC modular converter, constant current voltage limiting control module with Active PFC successively.
Described Switching Power Supply DC-DC modular converter with Active PFC comprises the L6562A chip, the Vcc1 pin of L6562A chip meets the high level Vbus1 of bridge rectifier module output, transformer is assisted winding one end ground connection, and the other end connects described Vcc1 pin by the first diode.The OUT pin of L6562A chip connects metal-oxide-semiconductor Q1 grid, and the metal-oxide-semiconductor drain electrode meets the high level Vbus1 that the bridge rectifier module is exported by the transformer main winding, and the CS pin of metal-oxide-semiconductor source electrode and L6562A chip is by the 3rd grounding through resistance.The INV pin of L6562A chip is connected with described constant current voltage limiting control module by optocoupler.
Described constant current voltage limiting control module comprises the TSM1052 chip, transformer secondary output winding one end ground connection, the other end provides direct voltage by the current rectifying and wave filtering circuit that the 3rd diode and the second electrochemical capacitor form, direct voltage connects the Vcc2 pin of TSM1052 chip by the 4th diode, described Vcc2 pin connects the negative pole of voltage stabilizing didoe, voltage stabilizing didoe plus earth, the Vctrl pin of TSM1052 chip connects the negative pole of the 4th diode by the 4th resistance, and passes through the 5th grounding through resistance; The Isense pin of TSM1052 chip is by the 6th grounding through resistance, and described direct voltage and Isense pin are connected on the led light source two ends and power to led light source.
The Isense pin of described direct voltage and TSM1052 chip is powered to led light source by the common mode filtering inductance that is connected on the led light source two ends.
Connect the first electric capacity between two outputs of described bridge rectifier module, the first electric capacity is solid capacitor.
Beneficial effect: the present invention compared with prior art, its remarkable advantage is:
1, cancellation the shortest high-voltage electrolytic capacitor of life-span prolongs the controller life-span, and the theoretical life-span extended to tens thousand of hours by ten thousand hours with interior.
2, by adopting simultaneously with the circuit of electric current loop and Voltage loop, making output constant current, current precision can reach ± and 1%, simultaneously pressure limiting.
Description of drawings
Fig. 1 is circuit module schematic diagram of the present invention;
Fig. 2 is circuit theory diagrams of the present invention.
Embodiment
As illustrated in figs. 1 and 2, the constant-current LED power supply without high-voltage electrolytic capacitor of the present invention comprises following part:
1, EMI/EMC circuit.Prevent extraneous and controller electromagnetic interference each other.
2, bridge rectifier.Be used for to exchange input and change direct current Vbus1 into.
3, Active PFC chip L6562A and peripheral circuit.
4, transformer.Be used for high voltage direct current Vbus1 is become low-voltage direct Vs.
5, constant current voltage limiting chip TSM1052.Have simultaneously electric current loop and Voltage loop, so that output constant current, output voltage limits within the specific limits simultaneously.
The present invention includes the EMI/EMC module, the bridge rectifier module that link to each other successively, the output of bridge rectifier module is connected to led light source by Switching Power Supply DC-DC modular converter, constant current voltage limiting control module with Active PFC successively; This power supply is the single-ended flyback circuit; Described EMI/EMC module input 220V exchanges.A piezo-resistance VR1 in parallel prevents thunderbolt at input.Inductance L 1, capacitor C X1, CX2, CY1-CY4 strobes.The rectifier bridge BD1 of bridge rectifier module will exchange input and become direct current Vbus1, and the Vbus1 waveform is the half sine-wave formula.Connect the first capacitor C 1, the first capacitor C 1 between two outputs of rectifier bridge BD1 and adopt solid capacitor, such as CBB electric capacity, cancelled short high-voltage electrolytic capacitor of life-span; 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 metal-oxide-semiconductor Q1 grid, 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 metal-oxide-semiconductor Q1 source electrode and L6562A chip IC 1 is by the 3rd resistance R 3 ground connection, transformer is assisted winding Naux one end ground connection, the other end connects described Vcc1 pin by the first diode D1, and the INV pin of L6562A chip IC 1 is connected with described constant current voltage limiting control module by optocoupler; Described constant current voltage limiting control module comprises TSM1052 chip IC 2, transformer secondary output winding Ns one end ground connection, the other end provides direct voltage Vs by the current rectifying and wave filtering circuit that the 3rd diode D3 and electrochemical capacitor E2 form, direct voltage Vs connects the Vcc2 pin of TSM1052 chip IC 2 by the 4th diode D4, described Vcc2 pin connects the negative pole of voltage stabilizing didoe D5, voltage stabilizing didoe D5 plus earth, the Vctrl pin of TSM1052 chip IC 2 connects the negative pole of the 4th diode D4 by the 4th resistance R 4, and passes through the 5th resistance R 5 ground connection; The Isense pin of TSM1052 chip IC 2 is by the 6th resistance R 6 ground connection, and described direct voltage Vs and Isense pin are powered to led light source by the common mode filtering inductance L 2 that is connected on the led light source two ends; L6562A is by the tracking to Vbus1 waveform after the rectification, and camera triggers metal-oxide-semiconductor Q1, so that it is synchronous to flow through electric current envelope and the Vbus1 of transformer main winding Np.Simultaneously, transformer main winding Np electric current is with to exchange input current synchronous, and Vbus1 and AC-input voltage are synchronous, and like this, AC-input voltage and electric current are synchronous, so that power factor (PF) is near 1.The auxiliary winding Naux of transformer is to the L6562A chip power supply; Transformer secondary output winding Ns is by D3 rectification and E2 filtering, output dc voltage Vs.Vs one tunnel powers to LED, leads up to D4 to the TSM1052 chip power supply, and voltage stabilizing didoe D5 works the TSM1052 voltage stabilization about 12V.Flow through the electric current of LED, deliver to the Isense pin by R6 sampling, the TSM1052 internal comparator consists of electric current loop, so that the voltage constant of Isense pin is at 0.2V, and such output current Iout=0.2V/R6.Vout voltage and Vs voltage are almost equal, and by R4, the Vctrl pin is delivered in the R5 sampling, and the TSM1052 internal comparator consists of Voltage loop, so that Vctrl pin voltage must not surpass 1.2V, like this Vout=Vs＜1.2 * (R4+R5)/R5+0.7.
Claims (5)
1. without the constant-current LED power supply of high-voltage electrolytic capacitor, comprise the EMI/EMC module, the bridge rectifier module that link to each other successively, it is characterized in that: the output of described bridge rectifier module is connected to led light source by Switching Power Supply DC-DC modular converter, constant current voltage limiting control module with Active PFC successively.
2. according to claims 1 described constant-current LED power supply without high-voltage electrolytic capacitor, it is characterized in that: described Switching Power Supply DC-DC modular converter with Active PFC comprises the L6562A chip, the Vcc1 pin of this L6562A chip meets the high level Vbus1 of bridge rectifier module output, transformer is assisted winding one end ground connection, the other end connects described Vcc1 pin by the first diode, the OUT pin of described L6562A chip connects metal-oxide-semiconductor Q1 grid, this metal-oxide-semiconductor drain electrode meets the high level Vbus1 of bridge rectifier module output by the transformer main winding, the CS pin of described metal-oxide-semiconductor source electrode and L6562A chip is by the 3rd grounding through resistance, and the INV pin of this L6562A chip is connected with described constant current voltage limiting control module by optocoupler.
3. according to claims 1 described constant-current LED power supply without high-voltage electrolytic capacitor, it is characterized in that: described constant current voltage limiting control module comprises the TSM1052 chip, transformer secondary output winding one end ground connection, the other end provides direct voltage by the current rectifying and wave filtering circuit that the 3rd diode and the second electrochemical capacitor form, this direct voltage connects the Vcc2 pin of TSM1052 chip by the 4th diode, described Vcc2 pin connects the negative pole of voltage stabilizing didoe, this voltage stabilizing didoe plus earth, the Vctrl pin of described TSM1052 chip connects the negative pole of the 4th diode by the 4th resistance, and passes through the 5th grounding through resistance; The Isense pin of described TSM1052 chip is by the 6th grounding through resistance, and described direct voltage and Isense pin are connected on the led light source two ends and power to led light source.
4. according to claims 3 described constant-current LED power supplys without high-voltage electrolytic capacitor, it is characterized in that: the Isense pin of described direct voltage and TSM1052 chip is powered to led light source by the common mode filtering inductance that is connected on described led light source two ends.
5. according to claims 1 described constant-current LED power supply without high-voltage electrolytic capacitor, it is characterized in that: connect the first electric capacity between two outputs of described bridge rectifier module, the first electric capacity is solid capacitor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011102608060A CN102984843A (en) | 2011-09-05 | 2011-09-05 | Constant current LED power supply not having high-voltage electrolytic capacitor |
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| CN2011102608060A CN102984843A (en) | 2011-09-05 | 2011-09-05 | Constant current LED power supply not having high-voltage electrolytic capacitor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105991041A (en) * | 2015-02-27 | 2016-10-05 | 乐金电子研发中心(上海)有限公司 | Indirect matrix converter |
| CN109412413A (en) * | 2018-12-24 | 2019-03-01 | 深圳市思科锐实业有限公司 | Intelligent high pressure pulse DC power supply |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201766737U (en) * | 2010-08-04 | 2011-03-16 | 无锡绿能电子有限公司 | Single-stage constant-current LED power supply with power factor correction |
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- 2011-09-05 CN CN2011102608060A patent/CN102984843A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201766737U (en) * | 2010-08-04 | 2011-03-16 | 无锡绿能电子有限公司 | Single-stage constant-current LED power supply with power factor correction |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105991041A (en) * | 2015-02-27 | 2016-10-05 | 乐金电子研发中心(上海)有限公司 | Indirect matrix converter |
| CN109412413A (en) * | 2018-12-24 | 2019-03-01 | 深圳市思科锐实业有限公司 | Intelligent high pressure pulse DC power supply |
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Application publication date: 20130320 |