Direct current (DC)/alternating current (AC) conversion device, direct current/ direct current conversion device and constant current driving device

Abstract

The present invention discloses a direct current (DC) / alternating current (AC) conversion device. The direct current (DC) / alternating current (AC) conversion device comprises a charge pump circuit, a half-bridge resonance device and a control device; the charge pump circuit is suitable for receiving direct current input voltage and alternating current feedback from the half-bridge resonance device, and a DC bus voltage is output after power factor correction; the half-bridge resonance device is suitable for receiving the DC bus voltage, an AC output voltage is output through conversion, the half-bridge resonance device includes a half-bridge inversion circuit and a resonance tank circuit, and the half-bridge inversion circuit consists of a switch and is suitable for receiving the DC bus voltage and a switching signal from the control device so as to output a pulse voltage to the resonance tank circuit; the resonance tank circuit is suitable for receiving the pulse voltage, an AC output voltage is output through resonance, and the resonance tank circuit is also suitable for output AC feedback to the charge pump circuit; and the control device is suitable for generating the switching signal and controlling the AC output voltage according to the switching signal, wherein the switching signal is configured to indicate on and off of the switch. The present invention further discloses a direct current / direct current conversion device and a constant current driving device.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to a DC / AC conversion device, a DC / DC conversion device and a constant current drive device. Background technique [0002] With the rapid development of power electronics technology and LED light sources, LED light sources are widely used in various lighting needs due to their high luminous efficiency, low power consumption, long service life, and strong safety and reliability. But at the same time, national standards, European standards, etc. have certain requirements for the power factor (PF value) of LED lighting products. In particular, the power factor requirements for LED lighting products are higher in engineering projects with a large number of applications. [0003] At present, the LED driving schemes to achieve high power factor include pre-amplified active power factor correction (APFC) circuit and single-stage active power factor correction constant current s...

AI Technical Summary

Problems solved by technology

[0003] At present, the LED driving schemes to achieve high power factor include pre-amplified active power factor correction (APFC) circuit and single-stage active power factor correction constant current scheme, etc. However, the above schemes also have cost Significant increase and decrease in efficiency of driving equipment, and its circuit structure is usually more complicated, which is not conducive to the implementation

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