POWER DEVICE

摘要

An energy efficient apparatus includes a switching device, a frequency dependent reactive device, and a control element is provided. The switching device is coupled to a source of electrical power and includes a pair of transistors and is adapted to receive a control signal and to produce an alternating current power signal. The frequency of the alternating current power signal is responsive to the control signal. The frequency dependent reactive device is electrically coupled to the pair of transistors for receiving the alternating current power signal and producing an output power signal. The frequency dependent reactive device is chosen to achieve a desired voltage of the output power signal relative to the frequency of the alternating current power signal. The control element senses an actual voltage of the direct current power signal and modifies the control signal delivered to achieve the desired voltage of the direct current power signal.

主权项

1. An apparatus for providing electrical power for use in charging electrical devices, comprising:
a power circuit electrically coupled to an electrical power source for receiving input power from the electrical source and delivering an output power signal to an electrical device the power circuit including: a switching device including a first pair of transistors and a second pair of transistors, the first pair of transistors for driving a highside of an AC power signal and the second pair of transistors for driving a lowside of the AC power signal; and a frequency dependent reactive device for receiving the AC power signal and generating the output power signal, the frequency dependent reactive device including a first capacitor coupled to the first pair of transistors for receiving the highside of the AC power signal, and a second capacitor coupled to the second pair of transistors for receiving the lowside of the AC power signal; an electrical current sensor coupled to the power circuit for sensing an electrical current being drawn by the electrical device from the power circuit; and a processor coupled to the current sensor and the power circuit, the processor programmed to: receive, from the electrical current sensor, a signal indicative of current being drawn by the electrical device; detect an initial current draw from the electrical device as a function of the received signal and responsively initiate a charging cycle; monitor a level of current being drawn by the electrical device during the charging cycle; and detect if the monitored level of current being drawn by the electrical device is less than a threshold level of current and responsively generate and transmit a control signal to the first and second pairs of transistors to operate the power circuit to disconnect power to the electrical device.