| 摘要 |
A dual-mode switching power control device includes an electric transformer, a PWM driving controller, a switching transistor, an isolation element, an output diode and an output capacitor. The PWM driving controller is connected to the switching transistor coupled to the electric transformer. The first side inductor of the electric transformer and the switching transistor are coupled to an input power, and the second side inductor of the electric transformer is coupled to the output diode. The output capacitor and a load are connected in series. The output power is converted into a feedback signal by the isolation element. The PWM driving controller determines to perform DCM or CCM based on the feedback signal to control the current flowing through the electric transformer, and the output power is generated. Therefore, the efficiency of power conversion is improved and is suitable for high power applications. |
| 主权项 |
1. A dual-mode switching power control device for converting an input power with an input voltage into an output power with an output voltage supplied to an external load, comprising:
an electric transformer; a PWM (pulse width modulation) driving controller; a switching transistor; an isolation element; an output diode; and an output capacitor; wherein the PWM driving controller drives a gate of the switching transistor, the electric transformer includes a first side inductor and a second side inductor, one end of the first side inductor is connected to a drain of the switching transistor, the input power is connected to an another end the first side inductor and a source of the switching transistor, the another end the first side inductor is further connected to the PWM driving controller, one end of the second side inductor is connected to a positive end of the output diode, a negative end of the output diode is connected to one end of the output capacitor and one end of the isolation element, a terminal voltage of the output capacitor serves as the output voltage, the load is connected to the output capacitor in parallel, an another end of the isolation element is connected to the PWM driving controller for converting the output voltage of a loading current of the load into a feedback signal which is transmitted to the PWM driving controller, and the dual-mode switching power control device is characterized by: the PWM driving controller determines whether a loading state of the load is light loading or heavy loading based on the feedback signal, the loading state is light loading if the feedback signal is smaller than a threshold value, and the loading state is heavy loading if the feedback signal is larger than the threshold value, wherein the PWM driving controller performs DCM (Discontinuous Conduction Mode) to drive the gate of the switching transistor in case of the light loading, and performs CCM (Continuous Conduction Mode) in case of the light loading. |
