When the circuit is not powered, the level is 0V everywhere.
When energized, + 5V_ALWP in the upper right corner charges C710, C722, C715, and C719 through the 1 pin of D32. At this time, the potential across the capacitor is as shown in the above figure. At this time, the actual level of the + 15V_ALWP output port is 5V.
When the Y pin of U64 starts to output a square wave with an amplitude of 5V, when Y is at the 5V potential for the first time:
1. Since the voltage across the capacitor cannot be abrupt, the voltage across C715 is 5V on the left and 10V on the right, and then the current charges the C719 capacitor through the 2 pin of D35. After charging, the voltage of C719 rises to 10V.
2. At the same time, the 5V output from Y also charges the C710. The voltage across C710 is 5V on the left and 10V on the right. Then the current charges C722 through the 2 pin of D32. After charging, the voltage of C722 rises to 10V.
At this time, the actual level of the + 15V_ALWP output port is 10V.
When the Y pin of U64 starts to output a square wave with an amplitude of 5V, when Y is at 0V for the first time:
1. Since the potential at both ends of the capacitor cannot be changed suddenly, the voltage across C715 is 0V on the left and 5V on the right. When C715 voltage is 5V, C722 will charge C715 because C722 voltage 10V is greater than C715's 5V. After charging, C715 = C722 = 7.5V. At this time, the voltage of C715 is still lower than that of C719. However, due to the reverse blocking of the D32 diode, the C719 will not charge the C715. The voltage of C719 is kept at 10V.
2. At the same time, the voltage of C710 is 0V on the left and 5V on the right. The voltage at the left end of C722 is 7.5V. Due to the reverse cut-off of the 2 pin of D32, C722 will still not charge C710, and C722 remains at 7.5V.
When Y is at 5V for the second time, C722 is charged to 10V through 2 pins of C710 and D32. When Y is low again, C722 (10V) charges C715 (7.5V). The voltage of C715 becomes 8.75V. After several times, the voltage difference across C715 rises to 10V. When Y is 5V again, the potential at the right end of C715 becomes 15V. Of course, in the whole process, C715 is charging C719 through the 2 pin of D35.
Finally, the level of the + 15V_ALWP output port becomes 15V.
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