Control circuit of push-pull converter

• Main Authors: LIU XIAOKE, PING QINGYUN, YAO JUN, LUO CONG, LI QIANYUAN, XIE ZHIWEI, CHEN YANDONG, ZHAO CHEN
• Format: Patent
• Language: Chinese; English
• Published: 04.08.2023
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION

The invention discloses a control circuit of a push-pull converter. The control circuit comprises a reference/voltage division circuit, an undervoltage/overvoltage detection circuit for over-temperature detection and input signals, a logic control circuit, an output voltage detection circuit, a timer circuit, a PWM waveform generation circuit and a drive circuit for starting and normal push-pull. The complexity of a main circuit can be reduced, the system size is reduced, and the loss is reduced; the voltage input signal and the system temperature are monitored in real time, the circuit is prevented from working mistakenly when the input voltage is not within the set threshold range, and therefore the reliability of the system is improved. 本发明公开了一种推挽变换器的控制电路，包括基准/分压电路、过温检测和输入信号的欠压/过压检测电路、逻辑控制电路、输出电压检测电路、计时器电路、PWM波形生成电路、启动时和正常推挽时的驱动电路。本发明可以降低主电路的复杂程度，减小系统体积，降低损耗；实现对电压输入信号及系统温度的实时监控，防止输入电压在非所设阈值范围内时电路误工作，由此提高系统的可靠性。