Power device for delivering power to electronic devices
First Claim
1. An apparatus, comprising:
- a voltage reduction circuit electrically coupled to an electrical power source for receiving an input power signal from the electrical power source and delivering an output power signal to an electrical device the voltage reduction circuit including;
a switching device coupled to the electrical power source, the switching device being adapted to receive a control signal and to produce an alternating current (AC) power signal, a frequency of the AC power signal being responsive to the control signal, the switching device including a first pair of transistors and a second pair of transistors;
a frequency dependent reactive device electrically coupled to the switching device for receiving the AC power signal and producing an output power signal having a voltage level that is less than a voltage level of the AC power signal, the frequency dependent reactive device including a first capacitor coupled to the first pair of transistors and a second capacitor coupled to the second pair of transistors, the first capacitor and the second capacitor being configured to adjust the AC power signal for producing the output power signal; and
an electrical current sensor electrically coupled to the voltage reduction circuit for sensing an electrical current being drawn by the electrical device from the voltage reduction circuit; and
a controller coupled to the electrical current sensor and the voltage reduction circuit, the controller configured to;
receive, from the electrical current sensor, a current 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 current 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 the control signal to the first and second pairs of transistors to operate the voltage reduction circuit to disconnect power to the electrical device.
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Accused Products
Abstract
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.
33 Citations
20 Claims
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1. An apparatus, comprising:
a voltage reduction circuit electrically coupled to an electrical power source for receiving an input power signal from the electrical power source and delivering an output power signal to an electrical device the voltage reduction circuit including; a switching device coupled to the electrical power source, the switching device being adapted to receive a control signal and to produce an alternating current (AC) power signal, a frequency of the AC power signal being responsive to the control signal, the switching device including a first pair of transistors and a second pair of transistors; a frequency dependent reactive device electrically coupled to the switching device for receiving the AC power signal and producing an output power signal having a voltage level that is less than a voltage level of the AC power signal, the frequency dependent reactive device including a first capacitor coupled to the first pair of transistors and a second capacitor coupled to the second pair of transistors, the first capacitor and the second capacitor being configured to adjust the AC power signal for producing the output power signal; and an electrical current sensor electrically coupled to the voltage reduction circuit for sensing an electrical current being drawn by the electrical device from the voltage reduction circuit; and a controller coupled to the electrical current sensor and the voltage reduction circuit, the controller configured to; receive, from the electrical current sensor, a current 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 current 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 the control signal to the first and second pairs of transistors to operate the voltage reduction circuit to disconnect power to the electrical device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An electrical circuit for providing electrical power for use in charging electrical devices, comprising:
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a rectifier circuit configured to receive an input AC power signal from an electrical power source and generate a rectified DC power signal; a switching device coupled to the rectifier circuit and configured to receive the rectified DC power signal and produce an intermediate AC power signal, the switching device including a first pair of transistors and a second pair of transistors; a frequency dependent reactive device coupled to the switching device for receiving the intermediate AC power signal and producing an output DC power signal having a voltage level that is less than a voltage level of the input AC power signal, the frequency dependent reactive device including a first capacitor coupled to the first pair of transistors and a second capacitor coupled to the second pair of transistors, the first capacitor and the second capacitor being configured to adjust the intermediate AC power signal for producing the output DC power signal; and an electrical current sensor electrically coupled to the frequency dependent reactive device for sensing an electrical current being drawn by the electrical device from the frequency dependent reactive device; and a controller coupled to the electrical current sensor and the switching device, the controller configured to; receive, from the electrical current sensor, a current 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 current 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 switching device to disconnect power to the electrical device. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of providing electrical power for use in charging electrical devices with a power circuit, the power circuit being electrically coupled to an electrical power source for receiving input power from the electrical power source and delivering output power to an electrical device, the power circuit including a current sensor, a controller, a switching device and a frequency dependent reactive device, the switching device being coupled to the electrical power source and including a first pair of transistors and a second pair of transistors, the frequency dependent reactive device being coupled to the switching device and including a first capacitor coupled to the first pair of transistors and a second capacitor coupled to the second pair of transistors the first capacitor and the second capacitor being configured to adjust and AC power signal for producing an output power signal, the method including the controller performing the steps of:
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receiving a current signal indicative of current being drawn by the electrical device from the current sensor; detecting an initial current draw from the electrical device as a function of the received current signal and responsively initiating a charging cycle; monitoring a level of current being drawn by the electrical device during the charging cycle; and
,detecting if the monitored level of current being drawn by the electrical device is less than a threshold level of current and responsively generating 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.
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Specification