JVC AV-27MF36 Power Supply Training page 19

TELEVISION
1. Apply an unregulated DC Voltage to the Transformer's Primary.
2. Switching the Primary ON and OFF will result in Secondary Voltage.
3. Controlling the ON/OFF timing of the Switching Device will result in a
Regulated Secondary Voltage
Switching power supply regulation is achieved by controlling
the switching device's ON/OFF timing .
BASIC SWITCHING
SUMMARY