Constant power control circuit for LED driver
A LED driver and constant power control technology, applied in the direction of electrical components, etc., can solve the problems of unstable output power, high implementation cost, and complicated programming tools, and achieve the effect of adjusting output current, convenient output current, and low cost
Pending Publication Date: 2021-07-20
鸣志电器(太仓)有限公司
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Problems solved by technology
[0006] Disadvantages: high implementation cost, complex programming tools
[0010] Disadvantages: The output power is not constant, and the working state of the driver is uncontrollable
[0011] There are also some control ICs that check the peak value of the switching current in each working cycle on the primary side, and use this peak value to limit the peak value cycle by cycle, so as to determine the driving duty cycle of the IC, but cannot precisely control the constant power output
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[0027] Next, the technical solutions in the embodiments of the present invention will be described in contemplation in the embodiments of the present invention, which will be described, and it is understood that the described embodiments are intended to be in an embodiment of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained without making creative labor without making creative labor, and should belong to the scope of the present invention.
[0028] The present invention is constant due to the change in the output voltage current of the driver, but the output power is constant. Thus, the power of the LED drive transformer is constant, and the LED driver needs to have a source PFC circuit, that is, the primary side operating voltage of the transformer is constant, so as long as the working current on the primary side, the output constant power can be achieved.
[0029] Such as figure 1 As shown, a co...
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The invention relates to a constant power control circuit for an LED driver, which comprises a PFC circuit, a DC-DC circuit, a sampling resistor R5 and an operational amplifier U1, wherein the PFC circuit, the sampling resistor R5 and the DC-DC circuit are sequentially connected in series, the positive pole input end of the operational amplifier U1 is connected between the sampling resistor R5 and the DC-DC circuit, and the output end of the operational amplifier U1 is connected with the DC-DC circuit. The current of the sampling resistor R5 is detected through the operational amplifier U1 to obtain the primary side current value of the DC-DC circuit, when the output power exceeds a set value, the primary side current value of the DC-DC circuit will exceed the set value, the operational amplifier U1 feeds back an overpower signal to the DC-DC circuit so as to limit the LED driver to output power, and the purpose of outputting constant power is achieved. Compared with the prior art, the circuit has the advantages of convenient adjustment of output current, control of output constant power, low cost and the like.
Description
Technical field [0001] The present invention relates to a control circuit for an LED driver, and more particularly to a constant power control circuit for an LED driver. Background technique [0002] LED lighting market standardization has been slow, and each sub-segment is different from the needs of specific performance, resulting in the same illumination requirements, LED lamp beads and combination of thousands of variables, so that the adaptability of the LED driver is getting wider. To increase the adaptability of the LED driver, two options are usually used to reduce the model number of the LED driver: [0003] Solution 1: Set the output voltage current of the drive using a single-chip programmable manner [0004] As long as the output power required by the lamp is within the set range, a driver can be used. [0005] Advantages: The output power is constant, the drive is controlled; [0006] Disadvantages: High implementation is high, and the programming tool is complicated...
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IPC IPC(8): H05B45/325
Inventor 涂必林杨智庄勤锋胡国勤陈小红季鹏
Owner 鸣志电器(太仓)有限公司