Exemplary embodiments are directed to wireless charging and wireless power alignment of wireless power antennas associated with a vehicle. A wireless power charging apparatus includes an antenna including first and second orthogonal magnetic elements for detecting a horizontal component of a magnetic field generated from a second charging base antenna. A processor determines a directional vector between the antennas.

Wireless power antenna alignment adjustment system for vehicles

Exemplary embodiments are directed to bidirectional wireless power transfer using magnetic resonance in a coupling mode region between a charging base (CB) and a battery electric vehicle (BEV). For different configurations, the wireless power transfer can occur from the CB to the BEV and from the BEV to the CB.

Wireless power transmission in electric vehicles

A driving circuit includes a first inductor coupled in series with a light source for providing power to the light source. A controller coupled to the first inductor can control a switch coupled to the first inductor, thereby controlling a current flowing through the first inductor. A current sensor coupled to the first inductor can provide a first signal indicative of the current flowing through the first inductor, regardless of whether the switch is on or off. The switch is controlled according to the first signal. A second inductor magnetically coupled to the first inductor is also electrically coupled to the first inductor via a common node between the switch and the first inductor for providing a reference ground for the controller. The reference ground is different from the ground of the driving circuit.

Circuits and methods for driving light sources

When a pan made of a nonmagnetic material, such as aluminum, is used for cooking while the is being controlled, notification is made to the user to the effect that the temperature control function has been stopped and that the temperature should be manually adjusted. When the material detection section detects that the pan is made of a non-magnetic material or a pan-floating phenomenon has occurred, in order to prevent abnormal increase in the temperature of the pan due to incorrect, temperature detection caused by the pan-floating phenomenon, a set temperature is lowered.

Induction Heating Apparatus

A switching power supply unit includes input terminals, output terminals, first to third primary windings and first to third secondary windings, a switching circuit, a rectifying smoothing circuit, and a driver. In the switching circuit, first and second switching devices, third and fourth switching devices, and first and second capacitors, coupled in series to one another, are disposed in parallel between the input terminals. In the rectifying smoothing circuit, first to third arms, each having two of rectifying devices disposed in series, are disposed in parallel between the output terminals, the first secondary winding is coupled between the first and the second arms to form an H-bridge coupling, the second and the third secondary windings are coupled between the second and the third arms to form an H-bridge coupling, and a choke coil is disposed between the first to the third arms and an output capacitor.

Switching power supply unit

A bi-directional DC-DC converter has a transformer for connecting a voltage type full bridge circuit connected to a first power source and a current type switching circuit connected to a second power source. A voltage clamping circuit constructed by switching elements and a clamping capacitor is connected to the current type switching circuit. The converter has a control circuit for cooperatively making switching elements operative so as to control a current flowing in a resonance reactor.

Bi-directional dc-dc converter and method for controlling the same

A bi-directional DC-DC converter uses a transformer for both step-down and step-up operations. A switching frequency for operating a switching device is set separately for the step-down and step-up operations. When, for example, the switching frequency during the step-up operation is lower than the switching frequency during the step-down operation, the range in which the duty ratio in PWM control can be controlled is widened, compensating for step-up ratio insufficiency. Conversely, step-down ratio insufficiency is compensated for by making the switching frequency during the step-down operation lower than the switching frequency during the step-up operation.

Bi-Directional DC-DC Converter and Control Method

The DC-DC converter connects a first and a second switching circuit for converting power mutually between direct current and alternating current respectively to a first DC power source and a second DC power source and has a transformer between the AC terminals thereof Here, between the AC terminals of the second switching circuit and the negative pole terminal of the DC power source, a voltage clamp circuit composed of a series unit of switching devices with a reverse parallel diode and a clamp condenser is connected An isolated bidirectional DC-DC converter which prevents a reduction in a circulating current at time of buck and an occurrence of a surge voltage at time of voltage boost and realizes highly efficiency, low noise, and miniaturization is provided

Isolated bidirectional DC-DC converter

PROBLEM TO BE SOLVED: To provide a power supply in which an LED can be driven with good voltage conversion efficiency even when a plurality of LED loads are driven. SOLUTION: A plurality of step-down chopper type voltage conversion circuits 10 and 20 for converting the voltage of a DC power supply 1 are connected in series, and a first LED load 15 having a high maximum voltage and a second LED load 25 having a low maximum voltage are connected to the output of each voltage conversion circuit 10, 20. Current flowing through each LED load is detected by a detector 16, 26 and the switching elements 11 and 21 of each voltage conversion circuit is subjected to drive control such that the difference between current command values Vref1 and Vref2 is decreased. In particular, the second voltage conversion circuit 20 requires a relatively small step-down rate because it steps down the voltage which is stepped down by the first stage voltage conversion circuit 10, and thereby conversion efficiency can be enhanced. In case of step-up, a voltage conversion circuit such as a step-up chopper is employed. COPYRIGHT: (C)2007,JPO&INPIT

Dc power supply, power supply for light emitting diode, and illuminator

An electromagnetic induction heating device includes an inverter for converting a DC voltage to an AC voltage and supplying the converted AC voltage to induction coils (11, 14) to inductively heat a heating-target object. The inverter includes first and second upper/lower arms (3, 4) having at least two switching elements connected in series; a first resonance load circuit (50) connected to an output terminal of an SEPP type inverter having the first upper/lower arm; a second resonance load circuit (70) connected to an output terminal of an SEPP type inverter having the second upper/lower arm; a third resonance load circuit (60) connected between output terminals of a full bridge inverter having the first and second upper/lower arms and having the first and second load circuits; and a switching unit (20) for connecting or disconnecting the third resonance load circuit to or from the inverter.

Hiroyuki Shoji

Papers

Bi-directional dc-dc converter and method for controlling the same

Bi-Directional DC-DC Converter and Control Method

Isolated bidirectional DC-DC converter

Dc power supply, power supply for light emitting diode, and illuminator

Electromagnetic induction heating device