Denso Corporation

Nippon Soken, Inc.

Yuuichi Handa

Seiji Iyasu

Katsutoyo Misawa

Kimikazu Nakamura

Yuuki Takemoto

Syuji Kurauchi

Naoto Kobayashi

Shuji Kurauchi

Shotaro Yamasaki

Kenta Hatakenaka

Yuji Hayashi

Syotarou Yamasaki

Ryota Tanabe

Kazuya Takeuchi

Tetsuya Matsuoka

Shinya Goto

Naoki Hirasawa

Kenji Tomita

Hiromi Ichijo

Makoto Okamura

Hideki Itou

A power converter includes a full-bridge circuit, power converting circuit, transformer, and controller. The full-bridge circuit includes a series-connected unit made of first and second switches and a series-connected unit made of third and fourth switches and is connected to power transmitting terminals. The power converting circuit is connected to power receiving terminals. The transformer includes power transmitting coil and power receiving coil. The power transmitting coil is connected to full-bridge circuit. The power receiving coil is connected to power converting circuit. The controller turns on the first and second switches alternately and also the third and fourth switches alternately. A resistive load is connected to the power receiving terminals. The controller serves to determine a phase difference between the time when first switch is turned on and the time when third switch is turned on to decrease with a decrease in measured voltage developed at the power receiving terminals.

Power converter with controller alternately turning on switches

An electric power conversion apparatus has an input and output terminal, and a switch unit, and turns on and off the switch unit to transfer electric power from an electric storage unit connected to the input terminal to a power supply target connected to the output terminal. When reverse conduction current flows in the switch unit, it causes a larger conduction loss in an off state than an on state. The apparatus includes: a control unit that determines whether there is a request for increasing an amount of heat generation due to the electric power transfer, and when it is determined that there is the request, turns off the switch unit in which the reverse conduction current flows during the electric power transfer and, when it is determined that there is no request, turns on the switch unit in which the reverse conduction current flows during the electric power transfer.

Electric power conversion apparatus

A power supply system includes a power conversion circuit that is connectable to a power storage unit. The power supply system includes a control unit and a heat transferring unit. The control unit supplies a current between the power storage unit and the power conversion circuit by performing on-off control of a switch that configures the power conversion circuit. The heat transferring unit absorbs heat that is generated in the power conversion circuit in accompaniment with the on-off control of the switch and transfers the heat to a temperature-increase target element. The control unit performs temperature-increase mode control in which the switch is on-off controlled such that an amount of heat that is generated in the power conversion circuit is increased when a temperature-increase request for the temperature-increase target element is present, compared to when the temperature-increase request is not present.

Power supply system

A power conversion apparatus includes an input side terminal, an output side terminal and a switch unit, switching the switch unit between ON and OFF during a power transmission. The switch unit has characteristics that, in the case where a reverse current flows through the switch unit, the larger a gate voltage thereof in a negative side, the larger a conduction loss occurring when the reverse current flows. The power conversion apparatus is provided with a control unit that increases, when determined that the increase request for increasing the heating value is present, the gate voltage of the switch unit to the negative side when turned OFF compared to a case where no increase request for increasing the heating value is present, the reverse current flowing through the switch unit during the power transmission.

Power conversion apparatus

A control apparatus for a power conversion apparatus acquires a detected voltage of an alternating-current power supply. The control apparatus determines a period from when the detected voltage exceeds a first determination value for determining a zero-up-crossing timing of an actual voltage of the alternating-current power supply until the detected voltage falls below a second determination value for determining a zero-down-crossing timing of the actual voltage to be a period during which the actual voltage has a positive polarity, and determines a period from when the detected voltage falls below the second determination value until the detected voltage exceeds the first determination value to be a period during which the actual voltage has a negative polarity. The first determination value is less than the detected voltage when the actual voltage is zero, and the second determination value is greater than the detected voltage when the actual voltage is zero.

Control apparatus for power conversion apparatus

In a power supply apparatus, one of a transformer and a first semiconductor device is stacked on the other thereof to constitute a stack assembly. The stack assembly, a second semiconductor device, and a choke coil are located on the major surface. A primary direct-current wire, which connects the first semiconductor device to a direct-current power source, is drawn out from a first predetermined portion of the stack assembly. A primary alternating-current wire, which connects the first semiconductor device and the transformer, is drawn out from a second predetermined portion of the stack assembly. The primary direct-current wire and the primary alternating-current wire are located to be separated from each other via at least a part of the stack assembly.

Power supply apparatus for reducing noise induced in DC wires

A power conversion apparatus includes a power conversion circuit, a choke coil, an auxiliary coil, and a rectifier element. The choke coil is disposed between the power conversion circuit and an input side direct current power source. The auxiliary coil is magnetically coupled to the choke coil and is connected in parallel with an output side circuit. The auxiliary coil is wound in a direction so that an excitation current flows from a negative electrode to a positive electrode of the output side circuit when an excitation current flows from a positive electrode to a negative electrode of the direct current power source through the choke coil. The rectifier element is series connection with the auxiliary coil, and cuts off power supply from the direct current power source to the output side circuit through the auxiliary coil and power supply from the output side circuit to the input side.

Power conversion apparatus having an auxiliary coil functioning as a flyback transformer

A power supply unit includes: a transformer; a primary component that constitutes a primary circuit connected to the transformer; a secondary component that constitutes a secondary circuit connected to the transformer; a choke coil; a base plate including the transformer, the primary component, the secondary component and the choke coil; a metal plate connected to the base plate; and a connecting member connecting the primary component and the transformer. The primary component and the transformer are laminated to constitute a first laminating body. A part of the metal plate is disposed closer to the transformer than the primary component, and the metal plate and the transformer are electrically connected by a ground line. A connection point between the ground line and the metal plate is located closer to the transformer than the primary component.

Power supply unit having heat dissipation structure

A power conversion apparatus for converting AC power supplied from an AC power source to DC power includes an AC-DC conversion circuit connected with the AC power source at an input end thereof for converting the AC power to DC power, a DC-DC conversion circuit connected with an output end of the AC-DC conversion circuit at an input end thereof for converting DC voltage level of the DC power generated by the AC-DC conversion circuit, a smoothing capacitor parallel connected to the output end of the AC-DC conversion circuit and the input end of the DC-DC conversion circuit, a DC link voltage detector for detecting a voltage of the smoothing capacitor as a DC link voltage, and a control unit for controlling operation of the DC-DC conversion circuit. The control unit suppresses an output power of the DC-DC conversion circuit, if the DC link voltage is smaller than a predetermined value.

AC-DC converter with output power suppression

An electric power converter includes a semiconductor module constituting a power conversion circuit, a capacitor electrically connected to the semiconductor module, and a cooling member for cooling the capacitor. The capacitor includes an element body provided with internal electrode, and a pair of end-face-electrodes provided on both end faces of the element body and connected to the internal electrode. The pair of end-face-electrodes are connected with a pair of bus bars, respectively, in a manner of surface contact. The capacitor is disposed in a state where one of the pair of end-face-electrodes is facing the cooling member. The end-face-electrode facing the cooling member is in contact with the cooling member via the bus bar.

Electric power converter

Power conversion apparatus converts input voltage and supplies output voltage to the electric load. The apparatus includes a semiconductor switch switches between open and closed states to regulate voltage control current for controlling output voltage, a first voltage detection section detects remote voltage being applied to the electric load as output voltage, a second voltage detection section detects a local voltage being applied to the output terminal as output voltage, a target current calculation section calculates target current which is the voltage control current target value, based on voltage deviation between target voltage which is the output voltage target value and either remote voltage or local voltage, and a switch control section controls the semiconductor switch so voltage control current becomes target current, to regulate output voltage to target voltage. The target current calculation section calculates the target current by using one of the remote or local voltage corresponds to a smaller target current.

A power-supply apparatus is provided which includes a transformer, a primary semiconductor unit, a secondary semiconductor unit, and a secondary electronic device. Each of the primary semiconductor unit and the secondary semiconductor units has a plurality of semiconductor devices installed therein. The transformer, the primary semiconductor unit, the secondary semiconductor unit, and the secondary electronic device are electrically joined through connecting conductors. The transformer is laid on the primary semiconductor unit to make a first stack. Similarly, the secondary electronic device is laid on the secondary semiconductor unit. This permits the power-supply apparatus to be reduced in overall size thereof and minimizes adverse effects of electromagnetic noise to ensure the high efficiency in power supply operation.

Compact structure of power-supply apparatus capable of minimizing electromagnetic noise

A power conversion apparatus supplies power from a DC power supply to a capacitive load by a current input push-pull DCDC converter provided with switching elements Qand Q. When a capacitive load voltage is not larger than a second predetermined value, a first mode is used which turns ON one of the switching elements Qand Qalternated with turning OFF both. When the capacitive load voltage is larger than the second predetermined value but not larger than a first predetermined value, a second mode is used which turns ON both of the switching elements Qand Q, then turns ON one of them, then turns OFF both, sequentially. When the capacitive load voltage is larger than the first predetermined value, a third mode is used, turning ON both of the switching elements Qand Qalternated with turning ON one of them.

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Anjo, Japan

Yuuichi Handa