Abstract: A load driving device of the invention includes an electric charge control unit 3, which charges a low-voltage battery 7 with a direct-current voltage from a DC/DC converter 2 that converts a high voltage from a high-voltage battery 1 into a low voltage. The electric charge control unit 3 includes a switching regulator 11 for performing switching of the direct-current voltage from the DC/DC converter 2 varying an output voltage supplied to the low-voltage battery 7, a series regulator 12 for inputting the direct-current voltage from the DC/DC converter 2 and adjusting power consumption to vary an output voltage supplied to the low-voltage battery 7, and a voltage-current detector 13 for detecting a voltage in accordance with a charge ratio of the low-voltage battery 7.

Abstract: An arc discharge preventing device is electrically connected to at least two electronic devices, the arc discharge preventing device. The arc discharge preventing device includes an insulating main body, a first terminal, a second terminal, a low conductive member, and a conductive member. The first terminal is provided on the insulating main body, and electrically connected to a first electronic device. The second terminal is provided on the insulating main body, and electrically connected to a second electronic device. The low conductive member is provided on the insulating main body, and having a first resistance value. The low conductive member is electrically connected to the first and second terminals. The conductive member is detachably mounted on the insulating main body, and having a second resistance value lower than the first resistance value. The conductive member is electrically connected to the first and second terminals when the conductive member is attached to the insulating main body.

Abstract: The safety device for a power circuit includes a first power circuit (2A) including a first load (4) and a first fuse element (5A) for receiving a first voltage power from a power supply (9) to supply the first voltage power to the first load through the first fuse element. The safety device includes a second power circuit (2B) including a second load (3) and a second fuse element (5B) for receiving a second voltage power from a converter (8), which converts the first voltage power into the second voltage power, to supply the second voltage power to the second load (3) through the second fuse element (5B). The device includes a fusion system (20) for fusing the other of the first and second fuse elements when an arbitrary one of the first and second fuse elements fuses.

Abstract: The electrical connection system includes a power source circuit for outputting a first voltage to operate a first load circuit. The power source circuit includes a conversion circuit for converting the first voltage into a second voltage lower than the first voltage. The system includes a second load circuit operative in response to the second voltage. The system includes a protection circuit for shunting the second load circuit with a threshold voltage between the first voltage and second voltage. The threshold voltage has identical influence on the second load circuit relative to the first voltage.

Abstract: When an ignition switch is off, even if a master CPU (20a) receives a predetermined command signal, the master CPU (20a) does not immediately transmit an activating signal to slave CPUs (20b). At this time, power necessary for an electronic control unit (8c) is being supplied from a standby-current supplying converter (10). The master CPU (20a) transmits an activating request signal to a controller (12) to activate a normal supplying converter (9). The controller (12), after activating the normal supplying converter (9), transmits an activating completion signal to the master CPU (20a). For the first time upon receipt of this activating completion signal, the master CPU (20a) transmits the activating signal to the slave CPUs (20b). Consequently, power is supplied from the normal supplying converter (9) to all the electronic control units (8c to 8f).

Abstract: An arc preventing circuit 12 is disposed between a DC/DC converter 6 and a battery (of 36 volts or 12 volts). In the arc preventing circuit 12, when the DC/DC converter 6 and the battery are to be connected to each other, the connection is performed via a circuit having a resistor R1, and then switched to that in which the connection is performed via a circuit not having the resistor R1. When the DC/DC converter 6 and the battery are to be disconnected from each other, the charging voltage of a capacitor C1 of the DC/DC converter 6 is discharged. According to the configuration, arc generation can be prevented from occurring during works of mounting and dismounting the DC/DC converter.

Abstract: A load driving apparatus is constituted with a high voltage power source, a low voltage power source, a first switching element, a second switching element, a lamp load, current detecting section, and PWM control section. The first switching element is connected to the high voltage power source which supplies a high voltage and is connected to the lamp load. The second switching element is connected to the low voltage power source which supplies a low voltage and is connected to the lamp load. The current detecting section detects a value of current flowing in the lamp load. The PWM control section is connected the first switching element, the second switching element, and the current detecting section to control a voltage to be supplied to the lamp load. The PWM control section turns the second switching element in ON state at first, and the low voltage is being supplied to the lamp load while the value of the current detected in the current detecting section is more than a predetermined value.

Abstract: A power source system for a vehicle includes a generator for producing a power. The system includes a first battery for being charged by the generator to supply a power of a first voltage to a first load. The system includes a second battery for supplying a power of a second voltage to a second load. The system includes a converter for receiving a power of the first voltage from the first battery to convert the power of the first voltage into a power of the second voltage to be supplied to the second battery. The system includes a controller for controlling output of the converter, in accordance with one of states of the generator, a charge of the first battery, the first load, a charge of the second battery, and the second load.

Abstract: A system and method for driving a load at a voltage higher than a normal driving voltage, being capable of reducing switching losses and heat generation amount. A load driving system 1 has a microcomputer 2, a DC/DC converter 3, and a semiconductor relay 5 provided to each lamp 4 as a load. The DC/DC converter 3 has a main switch 6, an auxiliary switch 7, and a resistor R1. A rectangular pulse signal at a desired duty ratio is given to the main switch 6 to turn the main switch 6 on and off, thereby to output a rectangular waveform voltage. A drive signal is given to the semiconductor relay 5 to supply the rectangular waveform voltage outputted from the DC/DC converter 3 to the lamp 4, illuminating the lamp 4.

Abstract: A load driving apparatus is provided with a power source (1) applying a power supply voltage, a load circuit (8), a relay circuit (4) electrically connecting the power source (1) to the load circuit (8), a first switching device (2) driving the relay circuit (4), a second switching device (3) having one end connected to the power source (1) and another end connected to the load circuit (8), and supplying the power supply voltage to the load circuit (8), and a control unit (7) outputting a control signal to the second switching device (3) so as to supply the power supply voltage to the load circuit (8) and thereafter outputting a control signal to the first switching device (2) so as to electrically connect the relay circuit (4) to the power source (1), thereby starting driving the load circuit (8).

Abstract: A vehicular power supply device which includes a generator, a high-voltage battery, a voltage converter, and a plurality of low-voltage batteries. The high-voltage battery is charged with power outputted from the generator and supplies the charged power to a high-voltage load. The voltage converter converts an output voltage of the high-voltage battery into another voltage. The plurality of low-voltage batteries respectively connected to the voltage converter in parallel, are charged with power outputted from the voltage converter and supply the charged power to a low-voltage load.

Abstract: An arc discharge preventing device is electrically connected to at least two electronic devices, the arc discharge preventing device. The arc discharge preventing device includes an insulating main body, a first terminal, a second terminal, a low conductive member, and a conductive member. The first terminal is provided on the insulating main body, and electrically connected to a first electronic device. The second terminal is provided on the insulating main body, and electrically connected to a second electronic device. The low conductive member is provided on the insulating main body, and having a first resistance value. The low conductive member is electrically connected to the first and second terminals. The conductive member is detachably mounted on the insulating main body, and having a second resistance value lower than the first resistance value. The conductive member is electrically connected to the first and second terminals when the conductive member is attached to the insulating main body.

Abstract: A load drive (1) having a pulse converter (2) and a DC/DC converter (5). The pulse converter (2) is capable of converting a high DC voltage supplied from the power supply unit (10) of a vehicle to a pulse voltage and applies the pulse voltage to a first lamp (L1). The DC/DC converter (5) operates to convert the high DC voltage to a low DC voltage whose voltage value is lower than the voltage value of the high DC voltage and applies the low DC voltage to a second lamp (L2).

Abstract: When an ignition switch is off, even if a master CPU (20a) receives a predetermined command signal, the master CPU (20a) does not immediately transmit an activating signal to slave CPUs (20b). At this time, power necessary for an electronic control unit (8c) is being supplied from a standby-current supplying converter (10). The master CPU (20a) transmits an activating request signal to a controller (12) to activate a normal supplying converter (9). The controller (12), after activating the normal supplying converter (9), transmits an activating completion signal to the master CPU (20a). For the first time upon receipt of this activating completion signal, the master CPU (20a) transmits the activating signal to the slave CPUs (20b). Consequently, power is supplied from the normal supplying converter (9) to all the electronic control units (8c to 8f).

Abstract: An arc preventing circuit 12 is disposed between a DC/DC converter 6 and a battery (of 36 volts or 12 volts). In the arc preventing circuit 12, when the DC/DC converter 6 and the battery are to be connected to each other, the connection is performed via a circuit having a resistor R1, and then switched to that in which the connection is performed via a circuit not having the resistor R1. When the DC/DC converter 6 and the battery are to be disconnected from each other, the charging voltage of a capacitor C1 of the DC/DC converter 6 is discharged. According to the configuration, arc generation can be prevented from occurring during works of mounting and dismounting the DC/DC converter.

Abstract: A first battery 12 is for supply of power at a first voltage. A second battery 13 is for supply of power at a second voltage to a load 14. A converter 120 is between the first battery 12 and the second battery 13. The converter 120 is for conversion of power between the first voltage and the second voltage in magnitude. A controller 110 is for operation of the converter 120 in dependent on a first current in magnitude through the load 14 and a second current in magnitude at an output terminal of the second battery 13.

Abstract: A battery body (27) has positive and negative battery electrodes (29, 30), which are provided in two accommodation spaces (32, 33) surrounded by an insulating wall portion (27a) that is an outer wall thereof, and also has terminal insertion openings (32a, 33a) adapted to permit only battery terminals, which correspond to the battery electrodes (29, 30) accommodated in the accommodation spaces (32, 33), respectively, to be fitted thereto. Each of the battery terminals (24, 25) has a connecting flat plate portion (24a, 25a) that has a transversal section of a predetermined shape and can be fitted into a corresponding one of the terminal insertion opening (32a, 33a). One of the terminal insertion openings (32a) has a nearly rectangular opening having an opening width (a1), which is wider than an opening width (c1) of the other terminal insertion opening (33a), and also having an opening height (b1), which is lower than an opening height (d1) of the latter terminal insertion opening (33a).

Abstract: A load driving system 1 capable of limiting the generation of an inrush current at the start of driving a load 2. A power source 3 having an output voltage higher than a normal driving voltage of the load is used for driving the load. An FET 4 is connected to the load. A rectangular pulse signal is supplied to the gate of the FET from a pulse generator 5a. The signal causes the FET to switch on and off, supplying the current to the load. When an inrush current flows at the start of driving of the load, an integrator 10 provided to the gate of the FET is operated to mitigate the rising characteristics of the pulse signal. This causes the current flowing through the load 2 to rise in a relaxation curve, thereby enabling the limitation of the inrush current.

Abstract: The safety device for a power circuit includes a first power circuit (2A) including a first load (4) and a first fuse element (5A) for receiving a first voltage power from a power supply (9) to supply the first voltage power to the first load through the first fuse element. The safety device includes a second power circuit (2B) including a second load (3) and a second fuse element (5B) for receiving a second voltage power from a converter (8), which converts the first voltage power into the second voltage power, to supply the second voltage power to the second load (3) through the second fuse element (5B). The device includes a fusion system (20) for fusing the other of the first and second fuse elements when an arbitrary one of the first and second fuse elements fuses.

Abstract: A load driving apparatus comprises a power supply, a load circuit, a first switch, a limiting resistor, a second switch and a controller. The power supply voltage is applied to the load circuit by the power supply, and the load is driven. The first switch is connected to the load circuit and the power supply in series, and enable or disenable the application of power supply voltage to the load circuit. The limiting resistor is connected to the load circuit in series, dividing the power supply voltage between itself and the load circuit, and thereby limiting the current supplied to the load circuit. The second switch is connected to the limiting resistor in series and to the first switch in parallel, and enable or disenable the application of power supply voltage to the load circuit and the limiting resistor.