The following is the circuit diagram of the color TV A3 power circuit Working principle: R520, R521 and R522 are starting resistors. The (1) and (2) windings of R519, C514, R524, V513 and T501 form a positive feedback loop, and C514 is an oscillating capacitor. V553 and peripheral components, VD515, V511, V512 form a voltage regulator control circuit. R552 is the sampling resistor, VD561 provides the reference voltage for the emitter of V553. When the output voltage of the power supply is too high, the conduction levels of V553, VD515, V511, and V512 are increased, so that the base of the switching transistor V513 is shunted, and the output voltage is followed. On the contrary, if the output voltage of the power supply decreases, the conduction levels of V553, VD515, V511, and V512 are reduced, so that the base shunt of the switching transistor V513 is reduced, and the output voltage is increased. VD518, VD519, and R523 form an overvoltage protection circuit. In addition, VD563 is also overvoltage protection. The role of C515: Let's see what happens if there is no C515. When the (1) leg of the switching transformer is positive at the moment (2), the voltage of the (1) pin is applied to the base of V513 via R519 and C514. V513 is saturated, but at the same time, the voltage is also applied to the base of V512 via R526. As a result, V512 is saturated and the V512 saturation conduction will force V513 to turn off, which is contradictory. Let's look at the case of adding C515: also when the (1) leg of the switching transformer is positive at the moment (2), and the V513 is saturated, the voltage is also applied to the base of V512 via R526, but due to C515 The existence of the voltage across C515 can not be abrupt, it takes a certain time delay, or C515 has a charging process, will make V512 saturated, so it will not interfere with the saturation of V513. Obviously, the size of the C515 determines the delay time, which will also affect the duty cycle of the V513 base pulse, which also affects the output voltage. According to this, some people mistakenly believe that C515 is an oscillating capacitor. This is obviously wrong. of.
Absolute rotary Encoder measure actual position by generating unique digital codes or bits (instead of pulses) that represent the encoder`s actual position. Single turn absolute encoders output codes that are repeated every full revolution and do not output data to indicate how many revolutions have been made. Multi-turn absolute encoders output a unique code for each shaft position through every rotation, up to 4096 revolutions. Unlike incremental encoders, absolute encoders will retain correct position even if power fails without homing at startup.
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