Back porch sampling circuit and method for sampling back porch falling edge voltage
A sampling circuit and voltage technology, applied in the direction of measuring current/voltage, measuring electrical variables, measuring devices, etc., can solve the problems of slow transient response, low precision of constant voltage and constant current, etc. The effect of voltage constant current accuracy
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[0051] The core idea of the present invention is that the back shoulder sampling circuit used includes: a counting circuit, a detection circuit and a calculation circuit. The detection circuit can detect the time T from when the switching element is turned off to the nth zero-crossing point of the ringing wave vcn or the time T at which the nth valley occurs van ; The calculation circuit can be based on the T vcn or T van Accurately calculate the time T from when the switching element is turned off to the falling edge of the ringing wave back dis , and then from switching element off after T dis The measured voltage is the exact voltage on the falling edge of the back porch V B , which passes through the resistor R 1 and R 2 After the voltage is divided, it is the sampling voltage V s . because T dis The calculation of is directly calculated by the back-porch sampling circuit, and the voltage V at the moment of the falling edge of the back-porch B and the peak curr...
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