Remotely-adjustable-solid-state-high-voltage-supply
The output voltage varies approximately linearly up to 20 kV as the input voltage is adjusted from 0 to 5 V. A 5-0 potentiometer is used to tune the oscillator, optimizing the output voltage at the frequency of maximum transformer response, which ranges from 45 to 55 kHz. The feedback voltage is routed through a 100 kΩ resistor, an operational amplifier, and a comparator to a high-voltage amplifier. A diode and varistors on the primary side of the transformer provide protection for the output transistor. The transformer utilized is a flyback type, commonly found in color television sets. A feedback loop maintains balance between the high-voltage output and the low-voltage input.
The circuit described operates as a high-voltage power supply, utilizing a flyback transformer to generate high voltage from a low-voltage input. The linear relationship between the input voltage and the output voltage allows for precise control over the output, crucial for applications requiring high voltage stability. The tuning of the oscillator via the potentiometer ensures that the transformer operates at its resonant frequency, maximizing efficiency and performance.
The feedback mechanism is essential for maintaining the desired output voltage. The 100 kΩ resistor limits the current flowing into the operational amplifier, which amplifies the feedback signal before it is compared to a reference voltage by the comparator. This comparison allows the system to dynamically adjust the output voltage by controlling the duty cycle of the oscillator, thereby ensuring that the high-voltage output remains stable despite variations in the low-voltage input.
Protection components, such as the diode and varistors, are critical for safeguarding the output transistor from voltage spikes and transients that may occur during operation. The flyback transformer itself is designed to store energy in its magnetic field and release it in a controlled manner, making it particularly suitable for applications requiring high voltages and rapid switching.
Overall, this circuit exemplifies a robust design for generating high voltages with a feedback control system, ensuring both efficiency and reliability in applications such as television sets and other electronic devices requiring high-voltage power supplies.The output voltage changes approximately linearly up to 20 KV as the input voltage is varied from 0 to 5 V. The oscillator is tuned by a 5-0 potentiometer to peak the output voltage at the frequency of maximum transformer response between 45 and 55 kHz.
The feedback voltage is applied through a 100-KO resistor, an op amp, and a comparator to a high-voltage amplifier. A diode and varistors on the primary side of the transformer protect the output transistor. The transformer is a flyback-type used in color-television sets. A feedback loop balances between the high-voltage output and the low-voltage input.
The circuit described operates as a high-voltage power supply, utilizing a flyback transformer to generate high voltage from a low-voltage input. The linear relationship between the input voltage and the output voltage allows for precise control over the output, crucial for applications requiring high voltage stability. The tuning of the oscillator via the potentiometer ensures that the transformer operates at its resonant frequency, maximizing efficiency and performance.
The feedback mechanism is essential for maintaining the desired output voltage. The 100 kΩ resistor limits the current flowing into the operational amplifier, which amplifies the feedback signal before it is compared to a reference voltage by the comparator. This comparison allows the system to dynamically adjust the output voltage by controlling the duty cycle of the oscillator, thereby ensuring that the high-voltage output remains stable despite variations in the low-voltage input.
Protection components, such as the diode and varistors, are critical for safeguarding the output transistor from voltage spikes and transients that may occur during operation. The flyback transformer itself is designed to store energy in its magnetic field and release it in a controlled manner, making it particularly suitable for applications requiring high voltages and rapid switching.
Overall, this circuit exemplifies a robust design for generating high voltages with a feedback control system, ensuring both efficiency and reliability in applications such as television sets and other electronic devices requiring high-voltage power supplies.The output voltage changes approximately linearly up to 20 KV as the input voltage is varied from 0 to 5 V. The oscillator is tuned by a 5-0 potentiometer to peak the output voltage at the frequency of maximum transformer response between 45 and 55 kHz.
The feedback voltage is applied through a 100-KO resistor, an op amp, and a comparator to a high-voltage amplifier. A diode and varistors on the primary side of the transformer protect the output transistor. The transformer is a flyback-type used in color-television sets. A feedback loop balances between the high-voltage output and the low-voltage input.