Abstract:
A system 10 provides a variable output voltage to a DC brush motor. The system includes a DC bush motor 14, a DC voltage source 12, a step-up, step-down DC/DC converter 16 including a switch 18. The DC/DC converter is constructed and arranged to step-up and step-down voltage from the source to provide an output voltage to the motor between 0 and 42 volts. A control unit 22 is constructed and arranged to receive an input signal 20 and to control the switch based on the input signal to control the motor.
Abstract translation:系统10向DC电刷电动机提供可变输出电压。 该系统包括直流衬套电动机14,直流电压源12,包括开关18的升压,降压DC / DC转换器16. DC / DC转换器被构造和布置成升压和降压 电压从电源提供输出电压到电机在0和42伏之间。 控制单元22被构造和布置成接收输入信号20并且基于输入信号控制开关以控制电动机。
Abstract:
An active filter reduces the common mode current in the ground wire of a PWM controlled motor drive circuit. The active filter is, in part, integrated into an integrated circuit chip and contains a buffer amplifier which drives two junction type or MOSFET transistors linearly to divert common mode current from a ground wire and through the transistors. The transistors are connected between positive and negative d-c busses which supply d-c power to a PWM inventor which drives an a-c motor, producing the common mode ground current in its grounded frame. A current transformer monitors the common mode current and its output is coupled to the input of the buffer amplifier to control the transistors. An internal power supply for the amplifiers is formed at the nodes between two current sources and two zener diodes which are connected between the d-c bus conductors. Headroom control circuits are disclosed to insure sufficient headroom voltage for each of the transistors under all input a-c voltage conditions.
Abstract:
A power conversion system for converting between electric and motive power may be utilized either in a generating mode to generate electric power from motive power supplied by a prime mover or in a starting mode wherein motive power is developed by the power conversion system from electrical power and is supplied through a torque converter to the prime mover to start same. The power conversion system includes a main generator, an exciter and a permanent magnet generator, or PMG, which together comprise a brushless alternator. When operated in the starting mode, power is supplied to the PMG to cause it to act as a motor and thereby drive a rotor which is common to the PMG, exciter and main generator. Once a predetermined operating condition of the generator is attained, the main generator is supplied power from a motor control to cause the generator to act as a synchronous motor and the power supply to the PMG is disconnected. The torque converter is then commanded to transfer motive power from the generator to the prime mover to start same.
Abstract in simplified Chinese:本发明提出一交流马达驱动系统及驱动方法,其可提高输入功率因子,以改善用电品质及改变直流链电压波形以提升驱动效率。此系统基本由三级电路串接而成。第一级为三相全波整流电路,用以将市电提供之三相交流电压转换为第一直流电压,再由第二级之升降压电路将第一直流电压转换成峰值为类弦波之第二直流电压,并提供给第三级之交流马达驱动电路,以驱动交流马达,借此可有效提高马达驱动电路之效率。本发明无需使用大容质之电解电容可有效改善习知三相整流与滤波电路所造成功率因子不佳之问题及延长马达驱动设备之寿命。
Abstract:
Embodiments of an integrated motor drive power electronics system are generally described herein. In some embodiments, the integrated motor drive power electronics system includes an active line filter (ALF) configured to control and regulate current drawn from an input power source and to attenuate current ripple fed back to the input power source, an energy storage capacitance coupled to an output of the active line filter, and a bidirectional low voltage power supply (LVPS). In some embodiments, the bidirectional LVPS may provide regulated power to a load and may selectively recycle power back to the input power source and regulate voltage at the load to a predetermined output voltage. In some embodiments, the energy storage capacitance may serve as a local input power source for higher power motor drive electronics and the bidirectional LVPS.
Abstract:
In some aspects, an actuation system includes an electrical positioning driver and an electrically-driven actuator. A voltage boost converter in the electrical positioning driver receives an input voltage. The voltage boost converter passes the input voltage to a voltage bus in the electrical positioning driver. The voltage on the voltage bus is converted to an actuator power signal that controls the electrically-driven actuator. The voltage boost converter boosts the voltage on the voltage bus to control a mechanical output performance of the electrically-driven actuator.