Drive circuit with ripple current elimination and reduced power consumption

Abstract

The present invention provides a driving circuit with ripple current elimination and power consumption reducing. The driving circuit with ripple current elimination and power consumption reducing is connected with the external circuit with a current ripple (such as a LED circuit), and comprises an output power module, a high-end current detection module, a mean value sampling module, a bias voltage module and an operational amplifier. The output power module is connected with the external circuit and is provided with an output transistor device to control the output of the external circuit; the high-end current detection module is provided with a sampling resistor connected with the output power module and is configured to obtain voltages of two ends of the sampling resistors and output sampling signals; the mean value sampling module is configured to receive the sampling signals and perform mean value sampling of the sampling signals; the bias voltage module is configured to output the bias voltage according to the mean value of the sampling signals; and the operational amplifier is configured to regulate the impedance of the output transistor device according to the bias voltage and the sampling signals so as to control the output of the external circuit for elimination of the current ripple.

Description

technical field [0001] The invention relates to a drive circuit with ripple current elimination and power consumption reduction, in particular to a drive circuit with ripple current elimination and power consumption reduction connected with a circuit with current ripple. Background technique [0002] Generally speaking, in common LED (light emitting diode) drivers, in order to be compatible with high power factor and cost control, it is usually realized by a single-stage PFC (power factor correction) circuit. The output current of this control method includes power frequency current The frequency of the ripple component is about twice the frequency of the power grid, that is, 100Hz (120Hz). Working under such low-frequency strobe for a long time will easily cause human visual fatigue and affect the life of the LED lamp. [0003] The common way to improve the current ripple is to increase the output filter capacitor used in the driver, but this will increase the circuit area ...

AI Technical Summary

Problems solved by technology

[0002] Generally speaking, in common LED (light emitting diode) drivers, in order to be compatible with high power factor and cost control, it is usually realized by a single-stage PFC (power factor correction) circuit. The output current of this control method includes power frequency current Ripple components, whose frequency is about twice the frequency of the power grid, that is, 100Hz (120Hz), working under such low-frequency stroboscopic conditions for a long time will easily cause human visual fatigue and affect the life of LED lights

[0003] The common way to improve the current ripple is to increase the output filter capacitor used in the driver, but this will increase the circuit area and cost; Significantly increase power consumption, this kind of current ripple improvement method has disadvantages that cannot be ignored

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