Pulse width modulation is an analog control method that modulates the bias of the gate or base of a transistor according to the change of the corresponding load to realize the change of the on-time of the output transistor or transistor of the regulated power supply. The output voltage remains constant as operating conditions change, making it a very efficient technique for controlling the analog circuitry using the digital output of the microprocessor. PWM control technology has become the most widely used control method of power electronics technology because of its simple control, flexibility and good dynamic response. It is also a research hotspot. Since the development of science and technology today has no boundaries between disciplines, combining modern control theory or implementing non-resonant soft-switching technology will become one of the main directions for the development of PWM control technology.
Membrane switch is an operating system that integrates key functions, indicating elements and instrument panels. It consists of four parts: panel, upper circuit, isolation layer and lower circuit.
When the membrane switch is pressed, the contacts of the upper circuit are deformed downward, and are in contact with the pole plate of the lower circuit.
After the finger is released, the contacts of the upper circuit bounce back, the circuit is disconnected, and the circuit triggers a signal. The membrane switch has strict structure, beautiful appearance and good sealing performance. It has the characteristics of moisture resistance and long service life.
Widely used in electronic communication, electronic measuring instruments, industrial control, medical equipment, automobile industry, smart toys, household appliances and other fields.
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