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A general fault diagnosis method is proposed for modular dc-dc converter system. The magnetic component voltage in each module is chosen as diagnostic signal, which can be easily obtained by adding an auxiliary winding into each magnetic core. Based on the feature of these signals, two logical hardware circuits are designed to achieve fast fault detection for different demands. Fault can be detected...
In this paper, a five-stage fault protection scheme against the short-circuit fault for parallel high-power three-phase combined inverter to achieve high reliability is proposed. There are two control modes, Voltage Controlled Mode (VCM) and Current Controlled Mode (CCM). VCM operates under normal operation to keep constant output voltage. CCM operates under fault operation to limit the output current,...
Switch fault diagnosis is an important design aspect for pulse width modulation (PWM) dc–dc power converters. It can prevent power converters from further damage, and also make preparations for remedial actions. In this paper, a fast switch fault diagnostic method is proposed for PWM dc–dc converters operating in continuous conduction mode. The proposed method utilizes the magnetic component (inductor...
The current is limited within a certain range with poor waveforms by fast response of hardware current limiting. The current limiting with software can produce good waveforms. The emphasis is the switch between the voltage loop and the current. In order to switch smoothly without shock waves, the traditional method is used to switch into the current loop, when current exceeds the upper limit point...
Combined three-phase inverter is constituted of three signal H-bridge inverters. This topology has several advantages and specially suits for high power application. However, when applying combined configuration into high power application, many new features are found. These new features affect the performance of inverter system in many ways. On the viewpoint of system, these new features must be...
For the medium or low voltage high-current applications, combined three-phase inverter topology is presented and mathematical model in dq coordinates is built. Several current-limiting methods are commonly used. They have their own shortcomings. Thus, a new strategy of hardware blockage with instantaneous currents, combined by software current limit with the average current is presented. Using fast...
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