CN202276501U

CN202276501U - Constant current LED power supply not having high-voltage electrolytic capacitor

Info

Publication number: CN202276501U
Application number: CN2011203309998U
Authority: CN
Inventors: 吕国峰; 周梅凤
Original assignee: Yixing Hongli Lamp Pole & Lamp Co Ltd
Current assignee: Hongli Lighting Group Co., Ltd.
Priority date: 2011-09-05
Filing date: 2011-09-05
Publication date: 2012-06-13
Anticipated expiration: 2021-09-05

Abstract

The utility model 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 utility model, 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

The constant-current LED power supply of no high-pressure electrolysis electric capacity

Technical field

The utility model relates to a kind of LED lamp power supply, especially a kind of constant-current LED power supply that does not have high-pressure electrolysis electric capacity.

Background technology

LED has energy savings as a kind of brand-new lighting system, and the life-span is long, remarkable advantages such as no mercury pollution, and development prospect is wide.

The traditional Switching Power Supply conceptual design circuit of the general employing of existing LED power supply need be used high-pressure electrolysis electric capacity, and the control of output constant voltage.

Traditional way will exchange input rectifying earlier and become Vbus1, and then through special power factor correction circuit, like L6562 etc., output direct current Vbus2 boosts.Through the adjustment of L6562, because the phase angle between AC-input voltage that non-resistive load caused and the interchange input current is contracted to 0, power factor (PF) is near 1 like this.Through traditional DC-DC switching power circuit,, can change HVDC Vbus2 into needed low-voltage direct Vs through transformer such as TEA1552T etc.Vs through 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 increase a big capacity high electrochemical capacitor voltage regulation filtering at the back at Vbus2, because electrochemical capacitor is under the situation of high pressure, high temperature, electrolyte is volatile, and the life-span is short, becomes the short slab in restriction entire controller life-span.

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 big, and promptly the LED power fluctuation is bigger, can cause the intensity of illumination fluctuation also big, also can influence the life-span of LED.

Summary of the invention

Goal of the invention: the purpose of the utility model is in order to overcome deficiency of the prior art, a kind of constant-current LED power supply that does not have high-pressure electrolysis electric capacity to be provided.

Technical scheme: the constant-current LED power supply of the described no high-pressure electrolysis electric capacity of the utility model comprises EMI/EMC module, the bridge rectifier module that links to each other successively, and the output of said bridge rectifier module is connected to led light source through Switching Power Supply DC-DC modular converter, the constant current pressure limiting control module of band Active PFC successively.

The Switching Power Supply DC-DC modular converter of said band 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 said Vcc1 pin through 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 through the transformer main winding, and the CS pin of metal-oxide-semiconductor source electrode and L6562A chip is through the 3rd grounding through resistance.The INV pin of L6562A chip is connected with said constant current pressure limiting control module through optocoupler.

Said constant current pressure limiting control module comprises the TSM1052 chip; Transformer secondary output winding one end ground connection, the current rectifying and wave filtering circuit that the other end is formed through the 3rd diode and second electrochemical capacitor provides direct voltage, and direct voltage connects the Vcc2 pin of TSM1052 chip through the 4th diode; Said 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 through the 4th resistance, and passes through the 5th grounding through resistance; The Isense pin of TSM1052 chip is through the 6th grounding through resistance, and said direct voltage and Isense pin are connected on the led light source two ends and supply power to led light source.

The Isense pin of said direct voltage and TSM1052 chip is supplied power to led light source through the common mode filtering inductance that is connected on the led light source two ends.

Connect first electric capacity between two outputs of said bridge rectifier module, first electric capacity is solid capacitor.

Beneficial effect: the utility model compared with prior art, its remarkable advantage is:

1, cancellation the shortest high-pressure electrolysis electric capacity 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, through adopting the circuit have electric current loop and Voltage loop simultaneously, making the output constant current, current precision can reach ± and 1%, pressure limiting simultaneously.

Description of drawings

Fig. 1 is the circuit module sketch map of the utility model;

Fig. 2 is the circuit theory diagrams of the utility model.

Embodiment

As illustrated in figs. 1 and 2, the constant-current LED power supply of the described no high-pressure electrolysis electric capacity of the utility model comprises like the lower 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 becoming low-voltage direct Vs to HVDC Vbus1.

5, constant current pressure limiting chip TSM1052.Have electric current loop and Voltage loop simultaneously, make and export constant current, output voltage limits within the specific limits simultaneously.

The utility model comprises EMI/EMC module, the bridge rectifier module that links to each other successively, and the output of bridge rectifier module is connected to led light source through Switching Power Supply DC-DC modular converter, the constant current pressure limiting control module of band Active PFC successively; This power supply is the single-ended flyback circuit; Said EMI/EMC module input 220V exchanges.A piezo-resistance VR1 prevents thunderbolt in the input parallel connection.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 first capacitor C, 1, the first capacitor C 1 between two outputs of rectifier bridge BD1 and adopt solid capacitor,, cancelled short high-pressure electrolysis electric capacity of life-span such as CBB electric capacity; The Switching Power Supply DC-DC modular converter of said band 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 that the bridge rectifier module is exported through transformer main winding NP, and the CS pin of metal-oxide-semiconductor Q1 source electrode and L6562A chip IC 1 is through the 3rd resistance R 3 ground connection, and transformer is assisted winding Naux one end ground connection; The other end connects said Vcc1 pin through the first diode D1, and the INV pin of L6562A chip IC 1 is connected with said constant current pressure limiting control module through optocoupler; Said constant current pressure limiting control module comprises TSM1052 chip IC 2; Transformer secondary output winding Ns one end ground connection; The other end provides direct voltage Vs through 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 through the 4th diode D4, and said 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 through the 4th resistance R 4, and passes through the 5th resistance R 5 ground connection; The Isense pin of TSM1052 chip IC 2 is through the 6th resistance R 6 ground connection, and said direct voltage Vs and Isense pin are supplied power to led light source through the common mode filtering inductance L 2 that is connected on the led light source two ends; L6562A is through the tracking to Vbus1 waveform after the rectification, and camera triggers metal-oxide-semiconductor Q1, makes that the electric current envelope and the Vbus1 that flow through transformer main winding Np are synchronous.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, make power factor (PF) near 1.Transformer auxiliary winding Naux give the L6562A chip power supply; Transformer secondary output winding Ns is through D3 rectification and E2 filtering, output dc voltage Vs.Vs one tunnel supplies power to LED, and the D4 of leading up to gives the TSM1052 chip power supply, and voltage stabilizing didoe D5 is stabilized in about 12V TSM1052 voltage and works.Flow through the electric current of LED, deliver to the Isense pin through R6 sampling, the TSM1052 internal comparator constitutes electric current loop, makes the voltage constant of Isense pin at 0.2V, like this 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 constitutes Voltage loop, makes Vctrl pin voltage must not surpass 1.2V, Vout=Vs＜1.2 * (R4+R5)/R5+0.7 like this.

Claims

1. the constant-current LED power supply that does not have high-pressure electrolysis electric capacity; Comprise the EMI/EMC module, the bridge rectifier module that link to each other successively, it is characterized in that: the output of said bridge rectifier module is connected to led light source through Switching Power Supply DC-DC modular converter, the constant current pressure limiting control module of band Active PFC successively.

2. according to the constant-current LED power supply of claims 1 described no high-pressure electrolysis electric capacity; It is characterized in that: the Switching Power Supply DC-DC modular converter of said band 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 said Vcc1 pin through first diode, and the OUT pin of said L6562A chip connects metal-oxide-semiconductor Q1 grid, and this metal-oxide-semiconductor drain electrode meets the high level Vbus1 of bridge rectifier module output through the transformer main winding; The CS pin of said metal-oxide-semiconductor source electrode and L6562A chip is through the 3rd grounding through resistance, and the INV pin of this L6562A chip is connected with said constant current pressure limiting control module through optocoupler.

3. according to the constant-current LED power supply of claims 1 described no high-pressure electrolysis electric capacity; It is characterized in that: said constant current pressure limiting control module comprises the TSM1052 chip; Transformer secondary output winding one end ground connection, the current rectifying and wave filtering circuit that the other end is formed through the 3rd diode and second electrochemical capacitor provides direct voltage, and this direct voltage connects the Vcc2 pin of TSM1052 chip through the 4th diode; Said Vcc2 pin connects the negative pole of voltage stabilizing didoe; This voltage stabilizing didoe plus earth, the Vctrl pin of said TSM1052 chip connects the negative pole of the 4th diode through the 4th resistance, and passes through the 5th grounding through resistance; The Isense pin of said TSM1052 chip is through the 6th grounding through resistance, and said direct voltage and Isense pin are connected on the led light source two ends and supply power to led light source.

4. according to the constant-current LED power supply of claims 3 described no high-pressure electrolysis electric capacity, it is characterized in that: the Isense pin of said direct voltage and TSM1052 chip is supplied power to led light source through the common mode filtering inductance that is connected on said led light source two ends.

5. according to the constant-current LED power supply of claims 1 described no high-pressure electrolysis electric capacity, it is characterized in that: connect first electric capacity between two outputs of said bridge rectifier module, first electric capacity is solid capacitor.