Input overvoltage crowbar and contain switching power supply of this circuit

• Main Authors: CHENG ZHIYONG, LU LIULI, SONG JIANFENG
• Format: Patent
• Language: Chinese; English
• Published: 02.11.2018
• Subjects: CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS; GENERATION

The utility model discloses an input overvoltage crowbar and contain switching power supply of this circuit, input overvoltage crowbar includes sampling circuit, comparison circuit and control circuit, sampling circuit's input is used for gathering the voltage at switching power supply's input electrolytic capacitor both ends to through its output sampled signal to comparison circuit, comparison circuit carries out the comparison with the sampled signal of its input with the default to through its output output switch signal to control circuit, whether control circuit is the low level according to the voltage of its output of control signal control that its input was received, the utility model discloses can be for ACDC switching power supply provide the input that need not return difference circuit overvoltage protection, the circuit is simple, and the device is small in quantity, easily design, the debugging of being convenient for, it is with low costs. 本实用新型公开了种输入过压保护电路及包含该电路的开关电源；输入过压保护电路包括采样电路、比较电路和控制电路