Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Panasonic Intellectual Property Management Co., Ltd.

Mitsuhiro Matsuo

Koji Yoshida

Seiichi Nakatani

Koichi Hirano

Hiroyuki Handa

Yoshihisa Yamashita

Yoshihiro Takeshima

Satoshi Ikeda

Masafumi Nakamura

Hiroshi Akamatsu

Koji Akimasa

Takaharu Murakami

A magnetic component unit in the present disclosure includes: a coil component; a heat dissipator which has an engagement fixing portion and a press fixing portion; and a magnetic core fixing portion. The magnetic core fixing portion includes: a holding portion that presses against the coil component; an engaging portion that extends from a first end part of the holding portion toward the heat dissipator and has a turned-back end part; and a pressing portion that extends from a second end part of the holding portion toward the heat dissipator and has an end part bent into an L-shape. The engagement fixing portion has a U-shape, and one end and the other end of the engagement fixing portion are connected to a peripheral edge portion of the heat dissipator. The press fixing portion has a columnar shape and is provided vertically protruding from the heat dissipator.

Magnetic component unit

In a bidirectional power supply device, a DC-DC converter is connected such that the longer an ON time of the first switch becomes, the higher a voltage of a second positive terminal and a second negative terminal becomes. When stopping the supply of power from a first positive terminal and a first negative terminal to a second positive terminal and a second negative terminal, a control circuit turns OFF a third switch, and then operates a switching signal generation circuit so that the ON time of the first switch becomes a maximum. The switching signal generation circuit is operated so that the ON time of the first switch becomes a maximum with the third switch turned OFF in start-up when supplying power from the second positive terminal and the second negative terminal to the first positive terminal and the first negative terminal.

Bidirectional power supply device

The power supply unit has a sample-and-hold circuit that samples a voltage supplied from a power source to a load according to a sample timing signal and holds the voltage as an output set value for the DC/DC converter. The unit supplies a load with an output from the DC/DC converter controlled so that an output voltage of a power source becomes an output set value of the DC/DC converter when the voltage of the power source drops. Since a voltage corresponding to the voltage of the power source before the voltage drop is set to the output set value of the DC/DC converter, a stable power supply unit is obtained in which the difference is always small between the voltage of the power source in normal times and the output voltage from the DC/DC converter when the voltage of the power source temporarily fluctuates.

Power supply unit

A power supply device of the present invention includes a switching element and a switch that operate so that when a primary DC voltage source of the device is in a voltage drop state, the power of a secondary auxiliary voltage source thereof is mixed with the power of the DC voltage source in a balanced manner and supplied to a load. This structure can reduce the maxim amount of power storage necessary for the auxiliary voltage source and thus the number of power storage elements necessary for the auxiliary voltage source. Thus, a smaller power supply device can be provided.

Power supply device

A limit value of an output current of power converter is defined as a first current value when a voltage at both ends of capacitor is higher than a voltage at both ends of battery, and a limit value of the output current thereof is defined as a second current value when the voltages are substantially equal to each other, the first current value is set to be smaller than the second current value. Thus, when a voltage at both ends of capacitor and a voltage at both ends of battery are substantially equal, heat is hardly generated. The limit value of the output current is set to a maximum current consumed by load. When a voltage at both ends of capacitor is higher than a voltage at both ends of battery, the limit value of the output current is set to be smaller than the second current value, and thereby heat generation is suppressed. Thus, the size of the heat dissipating components can be reduced, and a power supply system whose entire size can be minimized can be provided.

Power supply system

A switching power supply comprises one or more switching sections which repeat ON/OFF operation, a transformer having a primary winding and a secondary winding, a synchronous rectifier section for rectifying a voltage induced in the secondary winding when an input voltage is applied to the primary winding of the transformer by the switching section, a smoothing section for smoothing the voltage rectified by the synchronous rectifier section to obtain an output voltage, a PWM control circuit which generates a PWM signal for adjusting the output voltage to determine an ON/OFF ratio of the switching section, and a drive transformer for ON-OFF driving the synchronous rectifier section according to the PWM signal, and is configured so as to use the energy stored in the drive transformer or the transformer for the ON/OFF operation of the synchronous rectifier section.

Switching power supply

Provided is a switching power supply unit which uses a multilayer board or a stack of planar conductors as the windings of transformers so as to reduce the volume of the transformers and to have high efficiency, small size and small noise. The switching power supply unit is formed by connecting a plurality of capacitors (), (), () and () connected in series with each other to input terminals () and () of a plurality of switching power supplies having switching elements (), (), () and (), transformers () and (), and rectifiers (), (), () and (). The switching power supply unit inputs the voltages of capacitors ()-(), and outputs the respective voltages developed by the plurality of switching power supplies together to common output terminals () and (). The transformers () and () are each composed of windings made up of a stack of planar conductor coils. This structure can reduce noise transmission through the windings, thereby providing stable output characteristics.

Switching power supply apparatus and electronic device using the same

A sheet-like thermally conductive resin composition containing 70 to 95 wt. % inorganic filler and 5 to 30 wt. % thermosetting resin composition, a lead frame as a wiring pattern, and an electrically conductive heat sink with a metal pole placed therein are superposed, heated and compressed, and thus are combined to form one body. Consequently, a thermally conductive circuit board with a flat surface is obtained in which a grounding pattern is grounded to the heat sink inside the insulating layer. Thus, the grounding pattern and the heat sink can be connected electrically with each other in an arbitrary position inside the insulating layer of the thermally conductive circuit board. Accordingly, there are provided a thermally conductive circuit board with high heat dissipation, high conductivity and high ground-connection reliability, a method of manufacturing the same, and a power module allowing its size to be reduced and its density to be increased.

Method of manufacturing a thermal conductive circuit board with grounding pattern connected to a heat sink

A power module of the present invention mounts electronic components and comprises a circuit board that constitutes an electric power conversion circuit along with the above-mentioned electronic components; a heat sink; and a member with insulation characteristics and high thermal conductivity, which is disposed between plural devices with high heating value among the above-mentioned electronic components and the above-mentioned heat sink, embeds at least part of each of the above-mentioned plural devices with high heating value therein and transfers heat from the above-mentioned plural devices with high heating value to the above-mentioned heat sink.

Power module and production method thereof

A switching power supply wherein output voltage error detecting means detects the output voltage of DC-DC converters and generates an error signal, input voltage deviation detecting means detects voltages corresponding to the input voltages of the DC-DC converters to generate a deviation signal, and control means receives the error signal of the output voltage error detecting means and the deviation signal of the input voltage deviation detecting means and controls the driving of the DC-DC converters.

The invention provides a power module that is excellent in heat dissipation and suitable for the trend of miniaturization with high density, and provides also a method of manufacturing the same. The power module includes an insulating layer including an inorganic filler and a thermosetting resin composition, a lead formed on the surface of the insulating layer, and a semiconductor chip mounted on a insulating layer side of the lead, and a heat sink formed on the backside of the insulating layer. The semiconductor chip is mounted on the lead by flip-chip bonding and sealed in the insulating layer.

Power module with improved heat dissipation

By providing an end portion of a radiation plate located on and near an end portion of an insulator sheet, to which a lead frame extends, at a position away from the end portion of the insulator sheet inside of the insulator sheet in a plane direction of the insulator sheet, it is possible to secure a creeping distance between the lead frame and the radiation plate without decreasing a lead frame area on which components can be actually mounted.

Thermally conductive substrate, thermally conductive substrate manufacturing method and power module

A switching power supply device of the present invention comprises a transformer having at least a first primary coil, a first secondary coil, a second secondary coil, a second primary coil, and laminated in the sequence of the first primary coil, the first secondary coil, the second secondary coil, the second primary coil, and having a configuration wherein a center tap is drawn out from a connecting part between one end of said first secondary coil and one end of said second secondary coil; a switching part for alternately applying a voltage in a forward direction and an inverse direction to said transformer; a rectifying part for rectifying the voltage induced across the center tap of the transformer and the other end of the first secondary coil or the other end of the second secondary coil; a smoothing part for smoothing the voltage of the rectifying part; and a control part for controlling the on-off of the switching part so that the output voltage becomes stable.

Switching power supply device

A switching power supply device of the invention includes: a switching circuit for interrupting direct current to generate a pulse voltage; a transformer including a primary winding, a secondary winding, and a core for magnetically coupling the primary winding and the secondary winding; a multi-layer wiring board having wiring lines constituting the primary winding and the secondary winding; a rectifier circuit for rectifying an alternating current; a smoothing circuit for suppressing ripple; and a control circuit for controlling an output voltage from the smoothing circuit. The multi-layer wiring board is provided with at least the switching circuit and the rectifier circuit and is arranged on a main wiring board, and the control circuit is arranged on the main wiring board.

In a method of manufacturing a thermally conductive circuit board with high heat dissipation, high conductivity and high ground-connection, a sheet-like thermally conductive resin composition containing 70 to 95 wt. % inorganic filler and 5 to 30 wt. % thermosetting resin composition, a lead frame as a wiring pattern, and an electrically conductive heat sink with a metal pole placed therein are superposed, heated and compressed, and thus are combined to form one body. Consequently, a thermally conductive circuit board with a flat surface is obtained in which a grounding pattern is grounded to the heat sink inside the insulating layer. Thus, the grounding pattern and the heat sink can be connected electrically with each other in an arbitrary position inside the insulating layer of the thermally conductive circuit board. The method provides that a part of a lead frame and heat sink are connected not only mechanically, but also electrically, and allows an associated power module size to be reduced and its density to be increased.

Growing community of inventors

Osaka, Japan

Mitsuhiro Matsuo