Passive soft on-off circuit used for inversion bridge
A switching circuit, passive soft technology, applied in the field of power electronics, can solve the problems of high cost and complex structure, and achieve the effect of low cost, simple structure and less circuits
Inactive Publication Date: 2011-01-19
NORTHEASTERN UNIV LIAONING
View PDF0 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0004] In order to overcome the disadvantages of complex structure and high cost of existing passive soft-switching circuit technology, the present invention provides a passive soft-switching circuit for an inverter bridge. Additional detection and control, and no energy loss, is conducive to improving the efficiency of the inverter bridge
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0014] 1. Circuit structure
[0015] refer to figure 1 , the passive soft switching circuit for the inverter bridge of the present invention connects three electrolytic capacitors C in series between the DC bus bars d1 、C d0 、C d2 , Diode D 1 The cathode and switching device S 1 connected to the collector of the diode D 1 The anode of the switching device S 1 The emitter is connected to the diode D 4 The cathode and switching device S 4 connected to the collector of the diode D 4 The anode of the switching device S 4 The emitter is connected to the switching device S 1 and S 4 The midpoint of the bridge arm and S 1 Access coupling inductor L between 1 , in the switching device S 1 and S 4 The midpoint of the bridge arm and S 4 Access coupling inductor L between 4 , coupled inductance L 1 and L 4 The connection point of is used as the midpoint of the bridge arm. Coupled inductor L 1 , L 4 , L f tightly coupled on the same core, L f One end of the electro...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
A passive soft switch used for an inverter bridge belongs to the technical field of power electronics. In the circuit, three electrolytic capacitors are connected in series among DC buses and a coupling inductor is respectively connected between the midpoint of bridge arm and the switch devices of upper and lower bridge arms. One terminal of the third coupling inductor is connected with the anodeof a diode to form a series branch. Then the branch is connected in parallel with the middle electrolytic capacitor. The switch devices of upper and lower bridge arms are respectively connected in parallel with the branch which comprises a resonant inductor, a diode and a resonant capacitor. Then a diode is respectively connected at the connection points of the resonant capacitors and the diodes on the two branches. The other ends of the two connected diodes are respectively connected with the anode and the cathode of the middle electrolytic capacitor. The switch device can be turned on at zero current and off at zero voltage by the invention and then switch loss is reduced. Compared with the hard switching inverter circuit without dead area compensation, follow current can be provided for outputted phase current by the branch on which the electrolytic capacitor is in dead area time. Therefore, effect of the dead area is reduced.
Description
technical field [0001] The invention belongs to the technical field of power electronics, in particular to a passive soft switch circuit for an inverter bridge. Background technique [0002] Power electronics technology is a new application field of electronics, which is characterized by the use of power electronic switches to handle the control and conversion of power; the commonly used control method is the pulse width modulation (PWM) technology of chopper control. However, in the usual power converter circuit, the fully-controlled power electronic devices switch and commutate under the control of PWM, which will cause hard switching effect: during the switching transition period, the voltage or current will have a pulse peak with a high rate of change, and both The waveforms have large overlapping regions. Therefore, hard switching will inevitably produce defects such as large circuit loss, serious electromagnetic interference, and reduced reliability; and this defect i...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/44H02M7/42
CPCY02B70/1491Y02B70/10
Inventor 褚恩辉张化光刘秀翀王强侯利民
Owner NORTHEASTERN UNIV LIAONING