Bridgeless electrolytic-capacitor-free low-ripple-wave high-power constant-current power supply of LED lamp

A technology of LED lights and electrolytic capacitors, which is applied in the direction of electric light source, electric light circuit layout, light source, etc., can solve the problems of lower reliability, loss of low-voltage power supply power, and working dead zone, so as to reduce THD and EMI and improve electric current. Power efficiency, the effect of improving electric power

CN104284481AInactive Publication Date: 2015-01-14SHANGHAI ZHANKONGBI ELECTRONICS TECH +5
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2015-01-14
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a bridgeless electrolytic-capacitor-free low-ripple-wave high-power constant-current power supply of an LED lamp. The bridgeless electrolytic-capacitor-free low-ripple-wave high-power constant-current power supply of the LED lamp comprises an alternating-current power supply circuit, a control circuit, a coupling-out circuit and a ripple wave restraining circuit. The alternating-current power supply circuit comprises a constant-current drive chip U1, a constant-current drive chip U2, an alternating-current positive half-wave current loop and an alternating-current negative half-wave current loop, wherein the constant-current drive chip U1 and the constant-current drive chip U2 are controlled by the positive half-wave and the negative half-wave of an alternating-current power supply Uin. The current of the alternating-current positive half-wave current loop and the current of the alternating-current negative half-wave current loop both flow through a primary winding N11 and a primary winding N12 of a magnetic integration transformer TR so that an induced voltage can be generated on a secondary winding NV1 and a secondary winding NV2, and then the working voltage of the constant-current drive chip U1 and the working voltage of the constant-current drive chip U2 are provided through the control circuit. An induced secondary current is generated on a center post secondary winding N2 and is output to the loaded LED lamp through the coupling-out circuit. The ripple wave restraining circuit restrains current ripple waves. According to the bridgeless electrolytic-capacitor-free low-ripple-wave high-power constant-current power supply of the LED lamp, a bridge rectifier and an electrolytic capacitor are not adopted, so that the electric power is increased, the reliability is improved, the drive capability of the chips is improved through expanded current, the working temperature of the chips is lowered, the service life of the chips is prolonged, the constant-current precision is high, the current ripple waves are small, the LED lamp does not flicker, and the circuits meet the environmental-friendliness principle.
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Description

technical field

[0001] The invention belongs to the LED lamp constant-current power supply technology, in particular to a bridgeless, electrolytic capacitor, low ripple and high-power constant-current power supply for LED lamps. Background technique

[0002] The DU series chips of Shanghai Duty Cycle Electronic Technology Co., Ltd. combine mature low-cost analog technology and high-precision digital programming technology. Among them, the DU8966 chip is one of the LED constant current power driver chips with excellent cost performance. Each pulse closed-loop constant current control technology is suitable for wide power supply voltage, wide load voltage and wide inductance parameters. The constant current accuracy is 3%, high PF power factor, low harmonic THD; DU8966 built-in quasi-resonant TRUQR technology, Each pulse of the power electronic switch can realize real "valley switching", which reduces the EMI disturbance level, power electronic switch loss and temperature rise...

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Embodiment Construction

[0033] Combine below figure 1 The specific embodiment of the present invention will be further described.

[0034] Such as figure 1 As shown, there is no bridge, no electrolytic capacitor, low ripple and high power LED lamp constant current power supply, including: AC power supply circuit, control circuit, coupling output circuit and ripple suppression circuit;

[0035] The constant current power supply of the present invention adopts a magnetic integrated transformer TR, including a "day"-shaped magnetic core column, and the primary side winding N11 and the primary side winding N12 are respectively symmetrically wound on the two sides of the "day"-shaped magnetic core column On the column, the secondary winding NV1 and the secondary winding NV2 are symmetrically wound on the two side columns of the "day"-shaped magnetic core column, and the secondary winding N2 of the middle column is wound on the center of the "day"-shaped magnetic core column. On the column, the additiona...