The present invention provides a system comprising PoE apparatus including midspans, switches and routers that can provide high powered PoE connections that enable the recovery of DC power in sufficient quantities that allow it to be converted to AC power by way of an inverter. The invention also provides a method for providing AC power, data and light to office workstations using a single PoE connection. The invention further comprises a common mode signalling system that operates independently of any TCP/IP signal transmitted through an Ethernet connection wherein said signalling system is adapted to communicate with and control PoE powered devices.

The present invention provides a system comprising PoE apparatus including midspans, switches and routers that can provide high powered PoE connections that enable the recovery of DC power in sufficient quantities that allow it to be converted to AC power by way of an inverter. The invention also provides a method for providing AC power, data and light to office workstations using a single PoE connection. The invention further comprises a common mode signaling system that operates independently of any TCP/IP signal transmitted through an Ethernet connection wherein said signaling system is adapted to communicate with and control PoE powered devices.

The present invention provides a system comprising PoE apparatus including midspans, switches and routers that can provide high powered PoE connections that enable the recovery of DC power in sufficient quantities that allow it to be converted to AC power by way of an inverter. The invention also provides a method for providing AC power, data and light to office workstations using a single PoE connection. The invention further comprises a common mode signaling system that operates independently of any TCP/IP signal transmitted through an Ethernet connection wherein said signaling system is adapted to communicate with and control PoE powered devices.

According to one aspect, a UPS system is provided including an input configured to receive AC input power, an output configured to provide AC output power to a load, a rectifier coupled to the input, an inverter coupled to the rectifier and the output, an auxiliary branch coupled to the input and the output, and a controller coupled to the rectifier, the inverter, and the auxiliary branch, and configured to receive voltage information indicative of a voltage level of the AC input power and AC output power, select, based on the voltage information satisfying a first condition, a buck mode of operation, select, based on the voltage information satisfying a second condition, a freewheel mode of operation, and communicate one or more control signals to at least one of the rectifier, the inverter, and the auxiliary branch based on the selected mode of operation.

The present description concerns a circuit for converting from a first alternating voltage to a second voltage. The circuit includes: a first thyristor; a first control circuit of the first thyristor; a power factor correction circuit comprising a coil; and a first circuit configured to convert a third voltage into a fourth DC voltage. The third voltage corresponds to a difference between a potential at a first node connected to an output node of the coil and a reference potential. The fourth DC voltage is configured to supply the first control circuit of the first thyristor, and is referenced with respect to the same reference potential as the third voltage.

The present description concerns a circuit for converting from a first alternating voltage to a second voltage. The circuit includes: a first thyristor; a first control circuit of the first thyristor; a power factor correction circuit comprising a coil; and a first circuit configured to convert a third voltage into a fourth DC voltage. The third voltage corresponds to a difference between a potential at a first node connected to an output node of the coil and a reference potential. The fourth DC voltage is configured to supply the first control circuit of the first thyristor, and is referenced with respect to the same reference potential as the third voltage.

A magnetic field for application to body tissue is generated via a first inductor. Connecting circuitry, including at least first and second branches, is provided between an electric storage device and the first inductor. A switch forming part of the first branch electrically connects the storage device to the first inductor enabling electrical current to flow through the first branch and the first inductor, thereby causing the first inductor to generate the field. The current flowing through the first branch represents a first direction of flow between the storage device and the first inductor. An electric component conducts current primarily in a forward direction. That component forms part of the second branch, enabling current to flow between the storage device and the first inductor through the second branch. The flow in the forward direction represents a second direction opposite the first. A second inductor is connected in series with the first inductor. The second inductor has a variable inductance or can be bypassed using bypass circuitry. Electrical current flowing through the first inductor and through the connecting circuitry will also flow through the second inductor or the bypass circuitry, regardless of whether the electrical current flows through the first or the second branch.

A magnetic field for application to body tissue is generated via a first inductor. Connecting circuitry, including at least first and second branches, is provided between an electric storage device and the first inductor. A switch forming part of the first branch electrically connects the storage device to the first inductor enabling electrical current to flow through the first branch and the first inductor, thereby causing the first inductor to generate the field. The current flowing through the first branch represents a first direction of flow between the storage device and the first inductor. An electric component conducts current primarily in a forward direction. That component forms part of the second branch, enabling current to flow between the storage device and the first inductor through the second branch. The flow in the forward direction represents a second direction opposite the first. A second inductor is connected in series with the first inductor. The second inductor has a variable inductance or can be bypassed using bypass circuitry. Electrical current flowing through the first inductor and through the connecting circuitry will also flow through the second inductor or the bypass circuitry, regardless of whether the electrical current flows through the first or the second branch.

A wireless power system has a wireless power transmitting device and a wireless power receiving device. The wireless power transmitting device may be a wireless charging mat with one or more coils or may be a wireless charging puck with one or more coils. In some embodiments, the wireless charging puck may have six coils or other number of coils arranged in a ring. The wireless power receiving device may have an elongated magnetic core such as a C-shaped core with pillars at opposing ends. First and second coils may be formed on the pillars and a third coil may be formed between the first and second coils. The coils of the wireless power receiving device such as the first and second coils on the magnetic core may be configured to receive magnetic flux emitted by a pair of the six coils in the wireless charging puck.

A power supply includes a transistor that is connected to a primary winding of a transformer. A controller controls a switching operation of the transistor by quasi-resonant switching. The controller receives a feedback voltage and adjusts the feedback voltage to adjust a blanking frequency, which is an inverse of a blanking time during which the transistor is prevented from being turned on. The controller turns on the transistor after expiration of the blanking time based on a level of a resonant ring.