DC stabilized power supply is a common electronic instrument, which is widely used in experimental teaching and scientific research. Most of the currently used DC regulated power supplies have many shortcomings, such as unregulated output, unstable voltage, etc., resulting in inaccurate experimental results. The intelligent regulated switching power supply designed and manufactured by SG3525 control chip and single chip microcomputer has simple circuit, low price and excellent performance. Because it uses a single-chip microcomputer to set up a careful protection monitoring system to ensure reliable operation of the power supply, it has a high use value. Figure 1 3525 traditional control block diagram The traditional control scheme of the switching power supply controlled by SG3525 is shown in Figure 1. The 3525 compares the output voltage with a given reference voltage to adjust the duty cycle of the output pulse waveform to control the turn-off of the main circuit switch to achieve stable output. A disadvantage of the 3525 conventional control method is that the reference voltage is constant and the output shown is also constant. This is not a problem for the dedicated power supply, but for places like schools and laboratories, the power supply is not dedicated to a certain device, and the voltage varies according to the device, so the original control method is needed. to modify. Figure 2 Modified 3525 control block diagram The modified block diagram is shown in Figure 2. The output size of the power supply is input to the single-chip microcomputer by the keyboard, and the single-chip microcomputer gives a reference voltage according to the keyboard input, so that the output of the main circuit is stable. VGA Cable, VGA to VGA HD15 Monitor Cable SVGA M/M HD Cable Gold Plated Connectors Support 1080P Full HD for PC, HD TV, Projector, etc Compute Cable,Notebook Cable,HDMI to VGA Cord,VGA Cable,HDMI Cable UCOAX , https://www.jsucoax.com
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Design and Implementation of a Programmable Switching Power Supply Based on Single Chip Microcomputer and SG3525
introduction