| Patent application number | Description | Published |
|---|
| 20090050092 | Engine Start Device - An engine start device includes a generator, a battery charged by the generator, a starter, an electric double layer capacitor and a DC/DC converter. The electric double layer capacitor is connected between the starter and the battery. The DC/DC converter has an input terminal connected to the battery and the electric double layer capacitor. The DC/DC converter has an output terminal connected to the starter and the electric double layer capacitor. According to voltage of the battery, internal DC resistance of the battery or internal DC resistance of the electric double layer capacitor, the DC/DC converter effects control of charge voltage of the electric double layer capacitor so as to stabilize voltage applied to a starter motor and stabilize the engine start. | 02-26-2009 |
| 20090051337 | BIDIRECTIONAL POWER SUPPLY DEVICE - 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. | 02-26-2009 |
| 20090200991 | POWER SUPPLY SYSTEM - 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. | 08-13-2009 |
| 20090236915 | POWER SUPPLY DEVICE - 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. | 09-24-2009 |
| 20090315401 | POWER SUPPLY UNIT - 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 power source ( | 12-24-2009 |
| 20100052650 | VOLTAGE DETECTOR FOR STORAGE ELEMENT - A voltage detector for a storage element that includes a positive electrode and a negative electrode, both being biased to a positive voltage, is disclosed. The voltage detector includes a first PNP transistor of which emitter terminal is connected to the negative terminal and its base terminal is connected to its collector terminal, a voltage-current converter of which first end is connected to the positive electrode, a second PNP transistor of which emitter terminal is connected to a second end of the converter and its base terminal is connected to the base terminal of the first PNP transistor, a current source connected to the collector terminal of the first PNP transistor for drawing a current from the collector terminal, a current sensing circuit connected to the collector terminal of the second PNP transistor for sensing a collector current, and a voltage output circuit for outputting a voltage across the positive electrode and the negative electrode based on an output from the current sensing circuit. The foregoing structure allows the voltage detector to detect a voltage across the storage element accurately at a high speed. | 03-04-2010 |
| 20100090529 | ELECTRIC POWER SOURCE DEVICE - An electric power source device includes a direct current voltage source | 04-15-2010 |
| 20100091530 | DC/DC CONVERTER - A DC-DC converter includes a control circuit which can change the target voltage of the reference voltage source. At the start-up of the DC-DC converter, the PWM control circuit controls so that the first switching element gradually increases the on-off ratio from a minimum on-off ratio; that the second switching element is placed in the OFF state, and that the target voltage is set higher than the normal operating voltage. When the start-up operation is completed, the PWM control circuit controls so that the second switching element starts to turn on and off, and that the target voltage is returned to the normal operating voltage. | 04-15-2010 |
| 20100164446 | BIDIRECTIONAL DC-DC CONVERTER - The object of the present invention is to provide a bi-directional DC-DC converter having a simplified circuit configuration. Each output of high voltage detection circuit ( | 07-01-2010 |
| 20100231178 | POWER SUPPLY DEVICE - The power supply device contains a first auxiliary device and a first rectifier connected to a DC voltage source; a second auxiliary device that receives electric power via the first rectifier; a first DC/DC converter that uses the DC voltage source as an input source; an electricity storage device connected to an output terminal of the first DC/DC converter; and second DC/DC having an output terminal connected to the first rectifier, which uses the electricity storage device as an input source. When the DC voltage source has output voltage higher than a predetermined value, electric power is fed from the DC voltage source to the second auxiliary device and the electricity storage device is put on charge by the first DC/DC converter. When the output voltage gets lower than the predetermined value, the second DC/DC converter starts to operate, preventing decrease in voltage to be applied to the second auxiliary device. | 09-16-2010 |
