| 摘要 |
#CMT# #/CMT# The circuit has a bridge circuit with a power transistor (11), whose source terminal (1) is earthed, and delay blocks (3) connected parallel to a NOR block (2), where the blocks (2, 3) are formed as control detectors. The detectors determine frequency dissonance by a voltage of the transistor, where the dissonance is converted into frequency information that is fed to two AND blocks (4). The AND blocks feed output signals to two inputs of a differential amplifier (6), such that a frequency control block (7) uses the information for controlling the frequency generated by a bridge inverter. #CMT# : #/CMT# An independent claim is also included for a method for defining and regulating a resonance state of a bridge inverter. #CMT#USE : #/CMT# Circuit for defining and regulating a resonance state of a bridge inverter to produce electromagnetic high frequency energy in power electronics. #CMT#ADVANTAGE : #/CMT# The AND blocks feed the output signals to the inputs of the differential amplifier, such that the frequency control block uses the frequency information for controlling the frequency generated by the bridge inverter, thus avoiding the difference between the generated frequency and the natural frequency of the bridge inverter, and hence always operating the bridge inverter in a resonance state, and regulating the output power of the bridge inverter during a period of a gate impulse in a flexible manner. The circuit thus increases the reliability of the bridge inverter in a cost-effective manner. #CMT#DESCRIPTION OF DRAWINGS : #/CMT# The drawing shows a block diagram of a resonance state defining and regulating circuit. 1 : Source terminal 2 : NOR block 3 : Delay blocks 4 : AND blocks 6 : Differential amplifier 7 : Frequency control block 11 : Power transistor. |
