The present disclosure uses a capacitive voltage divider to supply a voltage that can be more readily handled by mainstream semiconductor and magnetic components (generally less than 1000 volts). The divided system voltage, expected to be between 500 and 1000 volts, is then converted to a power supply voltage to be used by the measuring equipment. For safety reasons, this voltage is frequently required to be less than approximately 50 volts if it is delivered via a connectorized cable with exposed contacts.

Embodiments for a voltage source converter are disclosed. In one embodiment, a voltage source converter can include first and second DC terminals for connection to a DC network, the voltage source converter including one or more limbs connected between the first and second DC terminals, each limb including: a phase element having one or more switching elements and at least one AC terminal for connection to a respective phase of a multi-phase AC network, the one or more switching elements configured to be switchable to selectively interconnect a DC side voltage at a DC side of the phase element and an AC side voltage at an AC side of the phase element; a first subconverter configured to be controllable to act as a waveform synthesizer to modify a first DC voltage presented to the DC network, the first sub-converter including at least one energy storage device capable of storing and releasing energy to selectively provide a voltage; and a second sub-converter connected with the phase element in an electrical block, the first sub-converter connected in parallel with the electrical block, the second sub-converter configured to be controllable to act as a waveform synthesizer to modify a second DC voltage presented to the DC side of the phase element, the second sub-converter including at least one energy storage device capable of storing and releasing energy to selectively provide a voltage.

A power supply comprises an inverter leg adapted to generate a first pulse width modulation signal by modulating an input signal, a phase shifter, which is adapted to generate a provisional second pulse width modulation signal by phase shifting a signal from which the first pulse width modulation signal is derived, a compensator, which is adapted to determine a second pulse width modulation signal from the provisional second pulse width modulation signal and add a compensation signal during the generating of the second pulse width modulation signal, and a coupled inductor, which is adapted to combine the first pulse width modulation signal and the second pulse width modulation signal to form the output signal.

An apparatus includes a primary transformer circuit including a plurality of primary coils. The apparatus further includes a delta secondary transformer circuit configured to magnetically couple to the primary transformer circuit. The delta secondary transformer circuit includes a first plurality of secondary coils, a first plurality of nodes coupled to the first plurality of secondary coils, and a second plurality of secondary coils configured to magnetically couple to the plurality of primary coils. Each coil of the second plurality of secondary coils is physically coupled to a respective node of the first plurality of nodes.

[Problem] Providing a plant growth acceleration system, which is safe to workers and also can be applied to even the case of a wide plant growth area. [Solution] The plant growth acceleration system, which can effectively accelerate plant growth in a wide plant growth area by radiating electrons to the plant growth area from linearly long extended electron radiation parts or a plurality of electron radiation parts installed distributedly. Moreover, if DC power generated by a solar power generation apparatus is converted to AC power by an inverter circuit and electrons are generated, introduction of the plant growth acceleration system becomes easy and favorable even for a wide plant growth area far from a supply base of commercial power. Furthermore, if regulation of an amount of electron radiation is enabled for optimization by utilizing past growth results corresponding to external environment of a plant growth area and kinds of plant, etc., improvement of yield of plant and quality can be realized more effectively.

A hybrid-mode boost power factor corrector includes an inductor, a switch unit, a diode unit, a current-detecting unit, and a control unit. The inductor is coupled to a DC input power source. The switch unit is coupled to the inductor and a ground. The diode unit is coupled to the inductor and the switch unit. The current-detecting unit receives an inductor current flowing through the inductor and provides a current detection signal corresponding to the inductor current. The control unit is coupled to the current-detecting unit to receive the current detection signal. When the hybrid-mode boost power factor corrector is operated in a light-load condition, the control unit samples a peak value of the current detection signal; when the hybrid-mode boost power factor corrector is operated in a heavy-load condition, the control unit samples an average value of the current detection signal.

In a power grid stabilization system, a second energy storage system has a larger energy storage capacity than a first energy storage system. A bidirectional AC/DC converter is connected between an AC power grid and a pair of input and output terminals of the first energy storage system. A first bidirectional DC/DC converter is connected between the pair of input and output terminals of the first energy storage system and a pair of input and output terminals of the second energy storage system.

[Problem] Providing a plant growth acceleration system, which is safe to workers and also can be applied to even the case of a wide plant growth area.

[Solution] The plant growth acceleration system, which can effectively accelerate plant growth in a wide plant growth area by radiating electrons to the plant growth area from linearly long extended electron radiation parts or a plurality of electron radiation parts installed distributedly. Moreover, if DC power generated by a solar power generation apparatus is converted to AC power by an inverter circuit and electrons are generated, introduction of the plant growth acceleration system becomes easy and favorable even for a wide plant growth area far from a supply base of commercial power. Furthermore, if regulation of an amount of electron radiation is enabled for optimization by utilizing past growth results corresponding to external environment of a plant growth area and kinds of plant, etc., improvement of yield of plant and quality can be realized more effectively.

An AC/DC converting apparatus having first and second input nodes for receiving an AC input voltage Vin, a first pair of switches for coupling a first terminal of a first inductor to the first input node and ground, a second pair of switches for coupling a second terminal of the first inductor to an output node for providing a DC output voltage Vout and ground, a third pair of switches for coupling a first terminal of a second inductor to the second input node and ground, and a fourth pair of switches for coupling a second terminal of the second inductor to the output node and ground. The first pair of switches is turned ON when Vin is in a first portion having a first polarity, the third pair of switches is turned ON when Vin is in a second portion having a second polarity.

A charging device for charging an electric energy storage device includes a power supply circuit connected to a power supply, an alternating current conversion circuit configured to convert a current from the power supply connected to the power supply circuit to a first alternating current with a preset frequency value, a transformer configured to convert the first alternating current to a second alternating current, wherein a voltage value corresponding to the second alternating current being less than a voltage value corresponding to the first alternating current, and a direct current voltage conversion circuit configured to convert the second alternating current to a direct current with a waveform fluctuating in a preset range, so as to charge an electric energy storage device. The alternating current conversion circuit is connected to the power supply circuit, the transformer is connected to the alternating current conversion circuit, and the direct current voltage conversion circuit is connected to the transformer.