A rectifying circuit including: between a first terminal of application of an AC voltage and a first rectified voltage delivery terminal, at least one first diode; and between a second terminal of application of the AC voltage and a second rectified voltage delivery terminal, at least one first anode-gate thyristor, the anode of the first thyristor being connected to the second rectified voltage delivery terminal; and at least one first stage for controlling the first thyristor, including: a first transistor coupling the thyristor gate to a terminal of delivery of a potential which is negative with respect to the potential of the second rectified voltage delivery terminal; and a second transistor connecting a control terminal of the first transistor to a terminal for delivering a potential which is positive with respect to the potential of the second rectified voltage delivery terminal, the anode of the first thyristor being connected to the common potential of voltages defined by said positive and negative potentials.

Rectifier circuit with thyristors

The invention discloses a three-phase electric rectification circuit and a three-phase electric rectification circuit time sequence control method, with the object to address the problem that the impulse current in a three-phase electric rectification circuit causes damage to switches. The three-phase electric rectification circuit comprises a three-phase AC input circuit, a rectifier bridge, electrolytic capacitors, a control circuit and a zero line. A first electrolytic capacitor and a second electrolytic capacitor are in series connection between the positive pole and the negative pole of the rectifier bridge DC output. The zero line is connected to the connection parts of the first electrolytic capacitor and the second electrolytic capacitor through a fourth switch and a first current-limiting resistor. The three-phase AC input circuit is connected to the bridge rectifier through a first switch, a second switch, and a third switch respectively. The control circuit, T1 after three-phase AC power is input, controls one of the three switches and the fourth switch to close. When the electrolytic capacitors are charged full, the fourth switch is turned off and the other two remaining switches of the three switches are also closed. By charging the electrolytic capacitors in advance to make sure that the voltage at both ends of the electrolytic capacitors is higher than three-phase electric rectification voltage, damage of impulse current generated from the closing of a main loop circuit to switches can be avoided.

Three-phase electric rectification circuit and three-phase electric rectification circuit time sequence control method

The invention discloses a pulse width modulation (PWM) rectifier circuit topology structure The PWM rectifier circuit topology structure comprises a single-phase PWM rectifier and a three-phase four-wire PWM rectifier, only one inductor is needed in the main topology of the single-phase PWM rectifier, and only three inductors are needed in the main topology of the three-phase four-wire PWM rectifier A PWM rectifier control method is a control method which is based on the SPWM technology and adopts an outer voltage ring and an inner current ring The public outer voltage ring and the independent inner current ring are controlled in a PI mode, and PI parameters are set for the public outer voltage ring and the independent inner current ring respectively According to the PWM rectifier circuit topology structure, the current and the voltage on the power grid side can be in the same phase, the harmonic content of the power grid side is reduced, and harmonic pollution is reduced

PWM rectifier circuit topology structure

The invention relates to an interlaced parallel bridge-less PFC circuit controller. The controller comprises a DSP processor, wherein the signal input end of the DSP processor is connected with an A phase power grid voltage esa, a direct current reference voltage Vdcr and a direct current feedback voltage Vdc while the signal output end is connected with the signal input end of a D/A converter; the signal output end of the D/A converter is connected with the signal input end of a current tracking control circuit; the signal output end of the current tracking control circuit outputs two paths of PWM pulse signals to a interlaced parallel PFC converter; and the interlaced parallel PFC converter consists of a first bridge-less PFC circuit and a second bridge-less PFC circuit which are interlaced and connected in parallel. The invention also discloses a control method for the interlaced parallel bridge-less PFC circuit controller. Complex mathematical modeling and algorithm design are not required, so that a PFC digital control method is greatly simplified; and current calculation processing efficiency can be effectively improved, so that input power factor can be further improved and input current THD can be lowered.

Interlaced parallel bridge-less PFC circuit controller and control method therefor

The present invention discloses a single-stage non-isolated double-Cuk type inverter without an electrolytic capacitor. An anode of an input power supply is connected to one end of an input inductor, a cathode of the input power supply is connected to a collector of a fifth power switch tube and a collector of a sixth power switch tube of a second Cuk circuit, and the other end of the input inductor is connected to a collector of a first power switch tube, and a collector of a second power switch tube and one end of an input capacitor; the other end of the input capacitor is connected to an emitter of a fourth power switch tube and an emitter of a third power switch tube; and an emitter of the fifth power switch tube is connected to an emitter of the first power switch tube, a collector of the third power switch tube and one end of a filter inductor, the other end of the filter inductor is connected to one end of the filter capacitor and one end of a load, the other ends of the filter capacitor and the load are connected to an emitter of the sixth power switch tube, an emitter of the second power switch tube and a collector of the fourth power switch tube. The single-stage non-isolated double-Cuk type inverter disclosed by the present invention is simple in structure, quick in dynamic response and good in tracking performance, and has relatively strong inhibiting capacity for fluctuations of the power supply and the load.

Single-stage non-isolated double-Cuk type inverter without electrolytic capacitor

The invention discloses an LCL filtering-based circuit topology structure of a high-power PWM (pulse-width modulation) rectifier. The circuit topology structure of the PWM rectifier comprises a single-phase PWM rectifier and a PWM rectifier adopting a three-phase and four-wire system; a better filtering effect is achieved by replacing the traditional L filter with an LCL filter; a PWM rectifier control method is based on the pulse width modulation technology of an SPWM (sinusoidal pulse width modulation) mode, and a control mode for a voltage outer loop and a current inner loop is adopted; a PI control mode is adopted by the common voltage outer loop and the independent current inner loop, and P and I parameters are respectively set for the common voltage outer loop and the independent current inner loop. According to the LCL filtering-based circuit topology structure disclosed by the invention, current and voltage cophasing at the grid side can be realized, so that the harmonic content of the grid side is reduced, and the harmonic pollution is reduced.

LCL filtering-based circuit topology structure of large-power PWM (pulse-width modulation) rectifier

The utility model discloses a circuit topology structure of a pulse width modulation (PWM) rectifier The circuit topology structure of the PWM rectifier comprises a single-phase PWM rectifier and a three-phase four-wire PWM rectifier, wherein only one inductor is needed in the main topology of the single-phase PWM rectifier, and only three inductors are needed in the main topology of the three-phase four-wire PWM rectifier The control method of the PWM rectifier is based on the sinusoidal pulse width modulation (SPWM) technology, and a voltage outer loop and current inner loop control method is employed The public voltage outer loop and the independent current inner loop both employ a PI control method, and the P and I parameters are set respectively for the public voltage outer loop and the independent current inner loop With the circuit topology structure, in-phase of the current and voltage at a power grid side is achieved, the harmonic wave content at the power grid side is reduced, and harmonic wave pollution is reduced

Xin Huan

Papers

LCL filtering-based circuit topology structure of large-power PWM (pulse-width modulation) rectifier

Circuit topology structure of PWM rectifier

PWM rectifier circuit topology structure