New type high-power LED driving power source

A LED drive, high-power technology, applied in the field of constant current controllers and drivers, can solve the problems of no dimming interface and low efficiency, and achieve the effects of prolonging service life, low temperature rise, and improving safety and reliability

Active Publication Date: 2010-01-06
YANTAI AOXING ELECTRICAL EQUIP
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AI-Extracted Technical Summary

Problems solved by technology

At present, there are few traditional isolated AC/DC switching power supplies and LED dedicated constant c...
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Method used

By the current sampling circuit 4 connected in series on the main circuit, the output current signal is converted into a small voltage signal, after the in-phase amplifying circuit 6 amplified by the operational amplifier, the small voltage signal obtains the available driving signal of the rear stage, and then The voltage divided by the resistors (R202, R203) is used as an input of the non-inverting adder circuit 7 of the subsequent stage, and the output current control signal of the external input is divided by the resistors (R34, R35) and then used as another input of the non-inverting adder circuit 7. An input signal, the output signal of the non-inverting adder circuit 7 synthesizes the output cur...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Abstract

The invention discloses a new type high-power LED driving power which comprises a protection filtering rectification and a PFC circuit, the input ends of the protection filtering rectification and the PFC circuit are connected with the power source, the output ends of the protection filtering rectification and the PFC circuit are connected with a half-bridge series-resonance circuit the output end of which is connected with a synchronous rectification circuit, the output end of the synchronous rectification circuit is connected with a current sampling circuit and a voltage sampling circuit, one path output of the current sampling circuit is connected with load, the other path output of the current sampling circuit is connected with a same-phase amplifying circuit, one path input of a same phase summer circuit is connected with the output end of the same-phase amplifying circuit, the other path input is connected with a control signal of an external output circuit, the output ends of the same phase summer circuit and the voltage sampling circuit are connected with the input end of a feedback control circuit together, and two path outputs of the feedback control circuit are respectively connected with the half-bridge series-resonance circuit and the synchronous rectification circuit, the new type high-power LED driving power of the invention can regulate the size of the output current according to the external control signal, can regulate light intelligently, maximizes the realization of energy conservation and energy consumption reduction, and has the advantages of high conversion efficiency, low temperature rise and permanent constant current output and the like.

Application Domain

Technology Topic

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  • New type high-power LED driving power source
  • New type high-power LED driving power source
  • New type high-power LED driving power source

Examples

  • Experimental program(1)

Example Embodiment

[0016] Structural Reference of the Invention figure 1 , figure 2 , image 3 , which includes a protection filter rectification PFC circuit 1, a half-bridge series resonance circuit 2, a synchronous rectification circuit 3, a current sampling circuit 4, a voltage sampling circuit 5, a non-inverting amplifier circuit 6, a non-inverting adder circuit 7 and a feedback control circuit 8.
[0017] The input end of the protection filter rectification and PFC circuit 1 is connected to an external AC input power supply, the output end is connected to the half-bridge series resonant circuit 2, the output end of the half-bridge series resonant circuit 2 is connected to the synchronous rectification circuit 3, and the output end of the synchronous rectification circuit 3 is connected to the voltage sampling circuit 5 and current sampling circuit 4;
[0018] The current sampling circuit 4 is composed of a current sampling element RS1. The input end of RS1 is connected to the output end of the synchronous rectifier circuit 3, and the output end of RS1 is connected to the load all the way to convert the output current signal into a voltage signal, and the other way is connected to the non-inverting amplifier circuit 6. input terminal connection;
[0019] The non-inverting amplifier circuit 6 is composed of an operational amplifier U4A, resistors R204, R205, R206 and capacitors C201 and C202. The non-inverting input terminal of the operational amplifier U4A is connected in parallel with R206 and C202, and the other end of R206 is connected to the output terminal of the current sampling circuit 4. The output current sampling signal is connected to the non-inverting input terminal of the operational amplifier U4A through R206, C202 is connected to the non-inverting input terminal of the operational amplifier U4A to the ground, C201 and R204 are connected in parallel between the inverting input terminal and the output terminal of the operational amplifier U4A, and R205 is connected to the operational amplifier. U4A inverting input to ground;
[0020] The non-inverting adder circuit 7 is composed of an operational amplifier U4B, resistors R30, R31, R32, R33, R34, R35, R202, R203 and capacitors C10 and C17. The non-inverting input terminal of the operational amplifier U4B is connected in parallel with R32, R33 and R32. The other end of R34 and R35 are connected in parallel, C17 and R35 are connected in parallel, the other end of R33 is connected in parallel with R202 and R203, and the other end of R202 is connected to the output end of the non-inverting amplifier circuit 6, and the output current signal is used as the non-inverting adder circuit. One input of 7, C10 and R30 are connected in parallel between the inverting input terminal and the output terminal of the operational amplifier U4B, and R31 is connected to the inverting input terminal of the operational amplifier U4B to the ground. R202 and R203 divide the output signal of the non-inverting amplifier circuit 6, connect the non-inverting input terminal of the operational amplifier U4B through R33, and connect the other terminal of R34 to the output current control signal input from the outside as another input of the non-inverting adder circuit 7 , R34, R35 divide the external output current control signal, connect to the non-inverting input terminal of the operational amplifier U4B through R32, R30, R31 set the negative feedback amplification ratio, C17 decoupling capacitor, C10 is used as a compensation capacitor; non-inverting adder The output end of the circuit 7 is connected to the input end of the feedback control circuit 8;
[0021] The voltage sampling circuit 5 is composed of resistors R207, R208 and R209. R207 and R208 are connected in series. The other end of R207 is connected to the output end of the synchronous rectifier circuit 3, the other end of the resistor R208 is connected to the input end of the feedback control circuit 8, and one end of R209 is grounded. The other end is also connected to the input end of the feedback control circuit 8;
[0022] The two outputs of the feedback control circuit 8 are respectively connected to the other input ends of the half-bridge series resonant circuit 2 and the synchronous rectification circuit 3;
[0023] The feedback control circuit 8 composed of the typical circuit of CM6900G can play the core control function, the protection filter rectification and PFC circuit 1 play the functions of input surge protection, filtering, rectification and power factor correction, the half-bridge series resonant circuit 2 and the synchronous rectification circuit 3 completes the power conversion of the main power circuit.
[0024] The working principle of the present invention is briefly described below:
[0025] Through the current sampling circuit 4 connected in series on the main loop, the output current signal is converted into a small voltage signal, and the small voltage signal is amplified by the non-inverting amplifier circuit 6 formed by the operational amplifier to obtain the drive signal available for the subsequent stage, and then through the resistance ( R202, R203) are divided as an input of the non-inverting adder circuit 7 of the subsequent stage, and the output current control signal input from the outside is divided by the resistors (R34, R35) as another input signal of the non-inverting adder circuit 7 , the output signal of the non-inverting adder circuit 7 integrates the output current information and the external adjustment control information on the output current, this signal is fed back to the input end of the feedback control circuit 8, and the feedback control circuit 8 resonates the half-bridge in series according to the input signal The circuit 2 and the synchronous rectification circuit 3 perform control functions, thereby realizing constant current control. This circuit adds the signal fed back by the current and the external control signal, and feeds it back to the control chip, so as to realize the combination of the two signals to control the output current, so as to achieve constant output current and adjustable output current.
[0026] By adjusting the resistor divider ratio of the two input signal terminals of the above adding circuit, the maximum output current of the driver and the adjustment range of the output current by the external control signal can be set respectively.
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the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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