Power supply and its output voltage low-frequency ripple compensation method

Abstract

The invention discloses a power supply device and an output voltage low frequency ripple compensation method thereof. The power supply device includes a power factor correction circuit and a DC to DC conversion circuit; and a DC / DC controller of the DC to DC conversion circuit acquires zero-crossing information and load information of an alternating current power supply of the power factor correction circuit through a communication protocol and performs low frequency ripple compensation on a control instruction according to the information with a table lookup manner. In this way, the power supply device and the method can solve the problem that the complexity of the controller is improved due to the conventional compensation technologies, and the whole property can be affected or the cost is increased.

Description

technical field [0001] The present invention relates to a power supply and its output voltage low-frequency ripple compensating method, in particular to a power factor correction circuit on the primary side of the power supply for zero-crossing of AC power supply and load information to a DC-to-DC conversion circuit. The related technology of compensating the control command of the DC conversion circuit with the look-up table method. Background technique [0002] A known switching power supply such as Figure 4 As shown, it includes a rectifier circuit 81, a power factor correction circuit 82 and a DC-to-DC conversion circuit 83, etc.; wherein: the rectifier circuit 81 converts the AC power supply AC in into a DC power supply, and the power factor correction circuit 82 and The output terminal of the rectifier circuit 81 is connected, and includes an inductor L1, a diode, a power switch S1 and a PFC controller located on the DC power circuit, wherein the PFC controller is con...

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Problems solved by technology

[0006] Although the aforementioned scheme can eliminate the low-frequency ripple in the output voltage Vout(t), but the input voltage Vin(t) is a high-voltage DC power supply, the ripple suppression circuit 84 must be a high-voltage circuit, which will not only complicate the circuit structure , which will also increase the cost

Another solution, which is similar to the previous solution, mainly uses a resonant controller to replace the above-mentioned ripple suppression circuit 84, but there are also problems such as increasing circuit complexity and cost.

[0007] It can be seen from the above that the existing technology used to eliminate the low-frequency ripple of the output voltage of the power supply complicates the structure of the derivative circuit, affects other characteristics, and increases the cost. Therefore, further review is required to seek a feasible solution.

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