C158PD

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Thyristors - SCRs (silicon-controlled rectifiers) are semiconductor components made from four layers of alternating P-type and N-type materials (doped silicon or germanium). SCRs are special devices that are extensively used in power control and conversion applications. They are ideal for applications that require a relatively large power source, such as industrial and commercial power supplies.

C158PD is a type of SCR which is especially suitable for the control of AC loads in medium and low power control applications. It provides excellent operational performance, including higher surge current and faster switching time. The C158PD also has low dV/dt sensitivity, low on-state surge current and low off-state current leakage.

The C158PD consists of a pair of opposite-polarity thyristors connected in series, which are often referred to as a "Darlington Pair". This configuration enables both thyristors to remain in the same voltage state, regardless of the polarity of the applied voltage. This configuration also allows for two thyristors to be controlled separately, which is beneficial for applications that require two stages of current control.

The primary application field of the C158PD is power control in AC power supplies. The C158PD can be used in both single-phase and three-phase power supplies, and it is usually used in conjunction with other components, such as resistors, capacitors, and other semiconductor devices, to control the output voltage and current of the power supply. The C158PD is also used to control the speed and direction of electric motors.

The working principle of the C158PD is based on the concept of "overvoltage protection". When an overvoltage is applied to the gate terminal, the gate-cathode junction of the thyristors will become forward-biased, allowing current to flow from the anode to the cathode. If the applied voltage is higher than the rated voltage of the thyristor, the voltage will be clamped by the thyristor, limiting the flow of current through the thyristor and protecting it from further damage.

The C158PD is also capable of pulse width modulation (PWM) control. PWM is a technique that is used to vary the width of pulses in order to control the output voltage of a power supply. PWM control is achieved by varying the ratio of on time to off time of the output voltage. Therefore, the output voltage can be adjusted according to the requirements of the system.

The C158PD is an important semiconductor device that can be used in a variety of power control and conversion applications. Its ability to provide overvoltage protection, as well as its capability for PWM control, make it a highly versatile device for use in industrial and commercial power supplies.

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