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Closed-loop control LED power supply

A LED power supply and closed-loop control technology, which is applied in the direction of electric light source, light source, lamp circuit layout, etc., can solve the problem of non-linear LED power factor is not strict, and achieve the effect of reducing grid interference, low failure rate, and low cost

Inactive Publication Date: 2015-06-10
沈阳北星仪表制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is not rigorous to calculate the nonlinear LED power factor with the linear power factor calculation method.

Method used

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  • Closed-loop control LED power supply
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Embodiment Construction

[0016] Such as figure 1 As shown, the present invention is a closed-loop control LED power supply. The current limiting resistor R1 is connected to the load terminals of all LED lights 3, the other end of the LED lights 3 is connected to the negative pole of the full bridge 5, the output end of the full bridge 5 is connected to the LED lights 3, and the input end of the full bridge 5 passes through the thyristor 4 Connect to mains power. The full bridge 5 can work in both the positive cycle and the negative cycle of the alternating current, and is connected to the load terminal of the LED lamp 3 through the current limiting resistor R1 to supply power for the LED lamp 3 . LED lamp 3 can be provided with a plurality of.

[0017] The other end of the LED light (3) is connected to the negative pole of the full bridge (5), the output end of the full bridge (5) is connected to the LED light (3), and the input end of the full bridge (5) is connected to the mains through the thyris...

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Abstract

The invention belongs to the technical field of illumination power supplies, and specifically relates to a closed-loop control LED power supply, wherein an alternating current commercial power input of 110V-230V is connected with a filtering coil L wiring terminal of a filtering coil L; a wiring terminal is connected with a commercial power N stage; a voltage-regulating variable resistor R3 is connected with a bidirectional diode DB3 after being connected in series with a resistor R2, a triggering capacitor C2 and a thermistor RT, so as to constitute a silicon-controlled conduction angle control circuit. The bidirectional diode DB3 is connected with a G stage of a silicon controlled rectifier. The thermistor RT is put in a proper position of an LED lamp for controlling a silicon-controlled conduction angle, thereby providing a closed-loop control signal for the LED lamp. A current-limiting resistor R1 is connected with all load terminals of the LED lamp; other terminals of the LED lamp are connected with a full-bridge cathode. A full-bridge output terminal is connected with the LED lamp. A full-bridge input terminal is connected with the commercial power through the silicon-controlled rectifier. The full bridge works in both the positive cycle and the negative cycle of the alternating current. A filtering capacitor C1 is connected with a rectifying full bridge. The closed-loop control LED power supply has the advantages of a simple circuit, a safe and reliable use, a low cost, and a low fault rate.

Description

technical field [0001] The invention belongs to the technical field of lighting power supplies, in particular to a closed-loop control LED power supply. It can automatically control the LED lamp current in a closed loop according to the ambient temperature and lamp temperature. Background technique [0002] What troubles the power supply department is that the harmonics generated by the electronic circuit make the neutral line current not zero, and the use of a large number of LED switching power supplies generates harmonics that can cause the neutral point of the transformer to carry current. The existing switching power supply is easily damaged because of its complex circuit. According to the statistics of Energy Star in the United States, the failure rate accounts for 67% of the total failure rate of lamps, and the LED lamp beads are often damaged before the power supply driver is damaged. The LED lamp bead emits light and generates heat at the same time. This heat wil...

Claims

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Application Information

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IPC IPC(8): H05B37/02
Inventor 范连波赵绪才程瑜
Owner 沈阳北星仪表制造有限公司
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