Power conversion apparatus and controlling method thereof

Abstract

A power conversion apparatus and a controlling method thereof are disclosed. The power conversion apparatus is applied with a power generation apparatus, which outputs a first signal. The power conversion apparatus includes a conversion-sensing circuit, a control signal generating circuit and a switching circuit. The conversion-sensing circuit converts the first signal into a second signal, and senses at least a voltage waveform change of the second signal to generate a time interval. The control signal generating circuit is electrically connected with the conversion-sensing circuit and outputs a control signal according to the time interval. The switching circuit is electrically connected with the power generation apparatus and the control signal generating circuit, and has a plurality switching elements. The switching circuit receives the first signal and conducts one of the switching elements according to the control signal so as to convert the first signal and output an output signal.

What is claimed is: 
     
         1 . A power conversion apparatus applied with a power generation apparatus, the power conversion apparatus comprising:
 a control signal generating circuit, which is electrically connected with the power generation apparatus and outputs a control signal according to a first signal generated by the power generation apparatus; and   a brake energy recovery circuit electrically connected with the power generation apparatus and the control signal generating circuit,   wherein the control signal controls the brake energy recovery circuit to store energy generated when the power generation apparatus brakes, and controls the brake energy recovery circuit to release the stored electric power to the power generation apparatus.   
     
     
         2 . The power conversion apparatus according to  claim 1 , wherein the brake energy recovery circuit has a switch unit, a first energy storage element and a second energy storage element, the switch unit is electrically connected with a first terminal of the first energy storage element, and a second terminal of the first energy storage element is electrically connected with a first terminal of the second energy storage element. 
     
     
         3 . The power conversion apparatus according to  claim 1 , further comprising:
 a conversion-sensing circuit electrically connected with the power generation apparatus and the control signal generating circuit, wherein the conversion-sensing circuit converts the first signal into a second signal, and the control signal generating circuit outputs a control signal according to the second signal.   
     
     
         4 . The power conversion apparatus according to  claim 3 , wherein the conversion-sensing circuit senses at least one voltage waveform change of the second signal to generate a time interval. 
     
     
         5 . The power conversion apparatus according to  claim 4 , wherein the control signal generating circuit outputs the control signal according to the time interval. 
     
     
         6 . The power conversion apparatus according to  claim 3 , further comprising:
 a switching circuit, which is electrically connected with the brake energy recovery circuit, the power generation apparatus and the control signal generating circuit, and has a plurality of switching elements, wherein the switching circuit receives the first signal and turns on one of the switching elements according to the control signal so as to convert the first signal and output an output signal.   
     
     
         7 . The power conversion apparatus according to  claim 6 , further comprising:
 a first energy storage unit electrically connected with the power generation apparatus and the switching circuit, wherein the first energy storage unit stores and releases electric power generated by the power generation apparatus according to turn-on and turn-off of the switching elements, respectively; and   a second energy storage unit, which is electrically connected with the brake energy recovery circuit and stores electric power of the output signal.   
     
     
         8 . The power conversion apparatus according to  claim 7 , further comprising:
 a filter unit, which is electrically connected with the power generation apparatus and the first energy storage unit, and stabilizes a voltage signal inputted to and outputted from the power generation apparatus.