The present invention provides a line interactive UPS, which comprises an AC input, an AC output, a chargeable and dischargeable device, a DC/AC inverter, a rectifying circuit, a full-bridge inverter, a capacitor, a switch, a charger, a boost circuit and a rectifying and buck circuit. An output of the boost circuit is connected to an input of the full-bridge inverter. The rectifying and buck circuit is controlled to provide a rectified output or a rectified and voltage-decreased output. An input of the rectifying and buck circuit is connected to the AC input. The rectifying and buck circuit is operative to provide a pulsating DC to the boost circuit or the full-bridge inverter. The line interactive UPS of the present invention can provide a stable AC to the AC output and has the advantages of small size and low cost.

The present invention provides a line interactive UPS, which comprises an AC input, an AC output, a chargeable and dischargeable device, a DC/AC inverter, a rectifying circuit, a full-bridge inverter, a capacitor, a switch, a charger, a boost circuit and a rectifying and buck circuit. An output of the boost circuit is connected to an input of the full-bridge inverter. The rectifying and buck circuit is controlled to provide a rectified output or a rectified and voltage-decreased output. An input of the rectifying and buck circuit is connected to the AC input. The rectifying and buck circuit is operative to provide a pulsating DC to the boost circuit or the full-bridge inverter. The line interactive UPS of the present invention can provide a stable AC to the AC output and has the advantages of small size and low cost.

A method for managing power in a transmitter to wirelessly transmit the power to a receiver. The method includes transmitting AC power through a resonance frequency band to the receiver using a transmission resonant coil, transmitting a state information of the transmitter including information related to the number of receivers that can be supported by the transmitter through out-of-band communication having a specific frequency band which is different from the resonance frequency band, receiving a state information of the receiver including information related to a rectified DC power detected by the receiver through rectification of the AC power from the receiver through the out-of-band communication and adjusting the AC power to transmit to the receiver based on the information related to the rectified DC power.

A method for managing power in a transmitter to wirelessly transmit the power to a receiver. The method includes transmitting AC power through a resonance frequency band to the receiver using a transmission resonant coil, transmitting a state information of the transmitter including information related to the number of receivers that can be supported by the transmitter through out-of-band communication having a specific frequency band which is different from the resonance frequency band, receiving a state information of the receiver including information related to a rectified DC power detected by the receiver through rectification of the AC power from the receiver through the out-of-band communication and adjusting the AC power to transmit to the receiver based on the information related to the rectified DC power.

The invention is a mechanism to alter a high voltage to a lower voltage load by connecting an electrical breaker to a variable frequency drive where the electrical load is connected to the electrical breaker. Additionally, the electrical breaker includes a means to prevent excessive current. The VFD can convert AC voltage to DC voltage, absorb and filter out high-frequency DC voltage variations, store the electricity, smooth the electricity out, convert electricity to a desired waveform, and output the electricity in the desired waveform.

The invention is a mechanism to alter a high voltage to a lower voltage load by connecting an electrical breaker to a variable frequency drive where the electrical load is connected to the electrical breaker. Additionally, the electrical breaker includes a means to prevent excessive current. The VFD can convert AC voltage to DC voltage, absorb and filter out high-frequency DC voltage variations, store the electricity, smooth the electricity out, convert electricity to a desired waveform, and output the electricity in the desired waveform.

One example discloses a bridge controller, including: a slope detector coupled between the first input node and the second output node; wherein the slope detector is configured to measure a rate of change of an input voltage across the first input node and the second input node; and wherein the bridge controller is configured to blank at least one of the first switch and the second switch if the measured rate of change exceeds a predetermined value.

One example discloses a bridge controller, including: a slope detector coupled between the first input node and the second output node; wherein the slope detector is configured to measure a rate of change of an input voltage across the first input node and the second input node; and wherein the bridge controller is configured to blank at least one of the first switch and the second switch if the measured rate of change exceeds a predetermined value.

A playback circuit including a digital-to-analog converter (DAC), an amplifying output circuit and a control circuit coupled to both is provided. The DAC is configured to convert an input playback audio signal into an input analog playback audio signal according to a first control signal for controlling an upper limit of power consumption of the DAC. The amplifying output circuit is coupled to the DAC and configured to generate an output playback audio signal according to the input analog playback audio signal and a second control signal for controlling an upper limit of power consumption of the amplifying output circuit. The control circuit is configured to generate the first control signal and second control signal according to a volume value of the input playback audio signal, thereby controlling the upper limit of power consumption of the DAC and the upper limit of power consumption of the amplifying output circuit.

A playback circuit including a digital-to-analog converter (DAC), an amplifying output circuit and a control circuit coupled to both is provided. The DAC is configured to convert an input playback audio signal into an input analog playback audio signal according to a first control signal for controlling an upper limit of power consumption of the DAC. The amplifying output circuit is coupled to the DAC and configured to generate an output playback audio signal according to the input analog playback audio signal and a second control signal for controlling an upper limit of power consumption of the amplifying output circuit. The control circuit is configured to generate the first control signal and second control signal according to a volume value of the input playback audio signal, thereby controlling the upper limit of power consumption of the DAC and the upper limit of power consumption of the amplifying output circuit.