PP881 | ABB | Integrated control module touch screen

Description

PP881 | ABB | Integrated control module touch screen

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After PP881 rectification and C1 filtering, a DC voltage of about 300V is obtained and applied to the ① pin (upper end of L1) of the transformer. At the same time, this voltage is biased by R1 to V1, causing it to conduct slightly. Current flows through L1, and at the same time, a positive voltage is formed at the upper end of the feedback coil L2 (③ pin of the transformer). This voltage is fed back to V1 through C4 and R3, making it more conductive and even saturated. Finally, as the feedback current decreases, V1 quickly exits saturation and stops, This cycle forms oscillation and induces the required output voltage on the secondary coil L3.

L2 is a feedback coil and also forms a voltage stabilizing circuit together with D4, D3, and C3. When the voltage of coil L3 on PP881 increases after being rectified by D6, it also shows that the voltage of PP881 on the negative pole of C3 is lower after being rectified by D4. When the voltage drops to about the voltage stabilizing value of D3 (9V), D3 conducts, causing V1 to have a short circuit to ground, turning off V1, and ultimately reducing the output voltage. R4, D5, and V2 in the circuit form an overcurrent protection circuit. When the working current of V1 is too high due to certain reasons, the voltage transformer generated on R4 is added to the V2 base through D5, V2 conducts, and the V1 base voltage drops, causing the V1 current to decrease. The theoretical voltage regulation value of D3 is 9V+0.5-0.7V. In practical applications, if you want to change the output voltage, simply replace D3 with different voltage regulation values. The smaller the voltage regulation value, the lower the output voltage, and vice versa.

Circuit PP881 of high current switching power supply (7): Circuit diagram of switching power supply using CF8865 dedicated module
This article introduces a switching power supply circuit that uses the CF8865 dedicated module, as the integrated control module in this circuit uses the CF8865 dedicated module. In the figure, VT4 and VTs are switching devices controlled by the excitation transformer Tz. Their output is reduced by the pulse transformer T3, and their secondary output voltage is rectified, stabilized, and filtered by a bridge to output two sets of positive and negative symmetrical PP881 power supplies. One set is ± 18V, and the other set is ± 50V

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