Power supply stabilizing device having active ballasting function and method thereof

Abstract

The invention discloses an initiative ballasting power supply stabilizing device and method, used to real-timely and stably control the control power supply of HID lamp, and comprising: power supply unit, arranged in the stabilizing device to generate external operating voltage and provided with DC-DC converter inside to make step-down conversion on output voltage; microcontroller unit, reading external various working conditions of the stabilizing device or HID lamp as its external reference parameters to generate a given load current; and PWM control unit, provided with proportional, integrative and differential (PID) control components to calculate the said load current and the actual load current of the HID lamp and let the said DC-DC converter regulate and change the output voltage according to the calculated results. The invention has a simple structure and can real-timely and stably regulate and change the load current.

Description

technical field [0001] The present invention relates to a power supply stabilizing device and method, in particular to a power supply stabilizing device and method which includes a power supply unit and uses a micro-controller unit to control the circuit. Background technique [0002] At present, most of the light sources used in projectors on the market are high-intensity discharge lamps (HID). In order to avoid damage to the HID lamp due to unstable voltage sources or improper operation by users, it is necessary to set a stable power control, such as figure 1 The power control device 1' of the existing HID lamp projector shown includes a power supply (Power supply) 10' and an electronic ballast (Ballast) 20', wherein the power supply 10' and the electronic ballast 20' The circuits are provided separately, especially in the parts of the auxiliary power supply circuits 115' and 220'. It works like figure 1 As shown, firstly, the power supply 10' is activated and then rece...

AI Technical Summary

Problems solved by technology

However, it should be noted that the ballasting method of the aforementioned electronic ballast 20' is to first passively detect the actual lamp current, and then control it through the transfer function through the pulse width modulation (PWM). In addition, it still needs an additional auxiliary The power supply circuit 220' is used to provide the operating voltage to the electronic ballast 20', thus complicating the device

In addition, because the electronic ballast 20' passively detects the actual lamp current, the real-time performance of power supply stability control is poor.

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