Digital set type standard power supply circuit(CD4516, μA723C)diagram

Published:2011/3/22 21:55:00 Author:Rebekka | Keyword: Digital set type, standard power supply | From:SeekIC

Digital set type standard power supply circuit diagram is shown as below. It is composed of digital set voltage switch(S1~S10), digital set type PWM circuit(CD4516, CD4025 and CD4013), smoothing PWM signal filter(LF356), clock generator(CD4025) and reference voltage source. Output voltage is set by Sl～S10, setting code is binary code. RPl is used for full-scale adjustment. Output voltage Uo will be adjusted to 10.23V when the digital input are all l. Filter gains 2 times(6dB), therefore, Uref is the half of 10.23V, voltage setting step is 10mV. To use the BCD-Binary number conversion circuit figure shown below when you use digital switch BCD code to set voltage. At this time, Uo is set to 3-digit display. The output voltage is 9.99V when the step voltage is 10mV. If you want to convert the polarity of output voltage, you can use the circuit diagram shown as below. The output Uo is positive voltage when Bs is 0; The output Uo is negative voltage when Bs is l. If you want to increase output power, you can use PA shown as the figure. But ±l5V power supply needs enough output power. If you want to change standard voltage into standard current source, you can add constant current circuit shown as the figure. Output positive and negative voltage polarity converting circuit diagram: PA circuit diagram: Constant current circuit disgram:



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