公开(公告)号：US5172309A

公开(公告)日：1992-12-15

申请号：US741873

申请日：1991-08-07

申请人： Rik W. A. A. DeDoncker ,  James P. Lyons

发明人： Rik W. A. A. DeDoncker ,  James P. Lyons

IPC分类号： H02M7/48

CPC分类号： H02M7/4826 ,  H02M2007/4811

摘要： An auxiliary quasi-resonant dc link (AQRDCL) converter is employed to achieve soft-switching in an inverter coupled to a dc supply via a resonant dc link circuit. The resonant dc link circuit generates a quasi-resonant voltage to the inverter via a resonant bus. The dc link circuit includes upper and lower capacitors coupled to series between the positive and negative rails of the dc supply, respectively, with the voltage across the lower capacitor being controlled to be greater than the voltage across the upper capacitor. In this way, the need for a switch shorting the resonant bus to ground during a resonant cycle is avoided. An auxiliary switching device assists resonant operation of the resonant bus to zero voltage in order to provide a zero-voltage switching opportunity for the inverter switching devices as the inverter changes state. The AQRDCL then quickly resonates back up to the positive rail voltage as a clamping circuit clamps the resonant bus voltage thereto either with or without the assistance of a second auxiliary switching device, as desired. The auxiliary switching device(es) operates under zero-current switching conditions and at a rate that is below the resonant frequency of the resonant dc link circuit. In addition to high efficiency, the AQRDCL converter has low current and voltage stresses and uses a minimal number of circuit components. The AQRDCL may be used to achieve soft-switching in a variety of inverter topologies, including a switched reluctance machine inverter.

公开(公告)号：US5166549A

公开(公告)日：1992-11-24

申请号：US741694

申请日：1991-08-07

申请人： Rik W. A. A. DeDoncker

发明人： Rik W. A. A. DeDoncker

IPC分类号： G01R19/175 ,  H02M1/08 ,  H02M7/48 ,  H03K5/1536

CPC分类号： G01R19/175 ,  H02M1/083 ,  H02M7/4826 ,  H03K5/1536

摘要： A zero-voltage crossing detector includes a transistor circuit in combination with comparator circuitry for determining when the voltage across a soft-switching device crosses zero. The transistor circuit includes a series combination of a detector transistor and a source, or emitter, load resistance coupled across the soft-switching device. The gate, or base, of the transistor is coupled via a resistive voltage divider to a dc supply. The source, or emitter, of the transistor is coupled to the comparator circuitry for comparing the voltage across the load resistance to a zero-voltage reference. During intervals when the voltage across the soft-switching device is greater than the input voltage to the detector transistor, the detector transistor is off, causing the output of the transistor circuit to equal the input voltage. Othewise, the detector transistor is active and the output voltage equals the voltage across the soft-switching device, so that the comparator circuitry generates signals to indicate the zero-voltage crossings.

摘要翻译： 零电压交叉检测器包括与比较器电路组合的晶体管电路，用于确定软开关器件两端的电压何时穿过零。 晶体管电路包括检测器晶体管与源极或发射极的串联组合，负载电阻耦合在软开关器件两端。 晶体管的栅极或基极通过电阻分压器耦合到直流电源。 晶体管的源极或发射极耦合到比较器电路，用于将负载电阻两端的电压与零电压基准进行比较。 在软开关器件两端的电压大于检测器晶体管的输入电压的间隔期间，检测器晶体管截止，导致晶体管电路的输出等于输入电压。 在此方面，检测器晶体管是有效的，并且输出电压等于软开关器件两端的电压，使得比较器电路产生用于指示零电压交叉的信号。