3 results about "Voltage loop" patented technology

The invention relates to a traction converter and control, fault processing and carrier phase shifting methods thereof. The traction converter comprises a first pre-charging loop and a second pre-charging loop that are connected with a secondary-side winding of the traction transformer respectively, a first four-quadrant rectifier module connected in series with the first pre-charging loop, a second four-quadrant rectifier module connected in series with the second pre-charging loop, an intermediate direct-current voltage loop with the input terminal connected with the output terminal of the first four-quadrant rectifier module and the output terminal of the second four-quadrant rectifier module, a first traction inverter module with the input terminal connected with the output terminal ofthe intermediate direct-current voltage loop, a second traction inverter module with the input terminal connected with the output terminal of the intermediate direct-current voltage loop, and an auxiliary inversion system with the input terminal connected with the output terminal of the intermediate direct-current voltage loop. According to the traction converter, the single four-quadrant rectifier module can work and the single traction inverter module can work; and the robustness is high, the fault rate is low, the size is reduced, and the cost is lowered.

The invention provides a PWM controller with current feedback, which comprises a voltage feedback module and a current feedback module, wherein the voltage feedback module comprises a voltage loop error amplifier of a voltage loop and a voltage loop feedback unit, the current feedback module comprises a feedback current controller and a current feedback unit, and the PWM controller with the current feedback is formed through the components. The PWM controller simultaneously has voltage feedback and current feedback, so the change condition of a load can be accurately judged, and the PWM controller can reach more stable output voltage and current.

The invention relates to the technical field of power equipment, and particularly discloses a secondary voltage loop abnormality parallelism detection device based on a current injection method, and the device comprises: a first bus loop which comprises a first primary side and a first secondary side; a second bus loop which comprises a second primary side and a second secondary side, wherein thefirst primary side and the second primary side are connected in parallel; a first micro-current transformer which is used for sensing the line current of the first secondary side; and a signal generation loop which comprises an on-off switch and a signal resistor which are connected in series, and the second secondary side is connected with the signal generation loop in series. The invention provides a secondary voltage loop abnormal parallel detection device based on a current injection method, which is used for discovering a secondary voltage abnormal parallel loop under the condition of nopower failure so as to avoid the risk of an electric shock accident and avoid the expansion of an equipment fault range.