Chung-hsin Electric and Machinery Manufacturing Corp.

Chen-Kun Chou

Chi-Bin Wu

Zhan-Yi Lin

Yu-Jen Chen

Ting-Kuan Li

Yu-Ming Sun

Jin-Ming Chang

The present invention discloses a power conversion circuit. A control module controls a pulse width modulation regulator to regulate a duty cycle of a DC-DC converter according to the direct current link voltage of the DC-DC converter and the output current and voltage of a renewable power supply. The control module also controls the pulse width modulation regulator to regulate a duty cycle of a DC-AC inverter according to the direct current link voltage of the DC-DC converter, output voltage of a utility power supply, and the output current and voltage of the renewable power supply.

Power conversion circuit

A system of a plurality of series-connected fuel cell converter devices and a method for controlling the system are provided. The system includes a plurality of fuel cell converter devices, a series connection unit, a power control unit, a Mux control unit, and a master controller. The output ends of a plurality of fuel cell converter devices are connected in series by the series connection unit. The master controller reads signals from the power control unit and the Mux control unit and determines accordingly which fuel cell converter devices need to be turned on to meet the requirement of a load. The method includes the steps of estimating a load, determining the number of the fuel cell converter devices to be turned on, calculating an output power, discharging, and charging. Thus, a plurality of fuel cell converter devices is controlled to output the required power of the load.

System of a plurality of series-connected fuel cell converter devices and method for controlling the system

A system of a plurality of parallel-connected fuel cell converter devices and a method for controlling the system are provided. The system includes a plurality of fuel cell converter devices, a parallel connection unit, a power control unit, a Mux control unit, and a master controller. The output ends of the plurality of fuel cell converter devices are connected in parallel by the parallel connection unit. The master controller reads signals from the power control unit and the Mux control unit and determines accordingly which fuel cell converter devices need to be turned on to meet the requirement of a load. The method includes the steps of estimating a load, determining the number of the fuel cell converter devices to be turned on, calculating an output power, discharging, and charging. Thus, the plurality of fuel cell converter devices is controlled to output the required power of the load.

System of a plurality of parallel-connected fuel cell converter devices and method for controlling the system

A linear modulation voltage transformer circuitry includes a power stage unit, a voltage division unit, a linear modulation unit, an error amplifier, and a recursive controller. The power stage unit adapts an input voltage and outputs a first voltage to the voltage division unit, which outputs a divided voltage. The linear modulation unit receives the divided voltage, compares it with a control voltage, and outputs an error voltage signal to the error amplifier, which amplifies the error voltage signal as an error gain control signal. The recursive controller receives and modulates the error gain control signal and outputs the modulation error gain control signal to the power stage unit as a reference signal so as for the power stage unit to modulate the first voltage. Thus, the first voltage can be varied in real time via the linear modulation unit to meet load demands.

Growing community of inventors

Kwei Shan Township, Taoyuan County, Taiwan

Chen-Kun Chou