Patent application number | Description | Published |
20110080681 | PROTECTION APPARATUS FOR LOAD CIRCUIT - There is provided a protection apparatus for a load circuit, capable of protecting the load circuit by simulating a fuse. A pseudo heat capacity Cth* smaller than a heat capacity of an electric wire used in the load circuit is set, and a temperature of the electric wire is calculated with reference to an arithmetic expression of heat generation amount of the electric wire, an arithmetic expression of heat radiation amount of the electric wire, a time counted by the count unit, and the pseudo heat capacity Cth*. Then, a semiconductor relay S | 04-07-2011 |
20110242716 | LOAD CIRCUIT PROTECTION DEVICE - To provide a protection circuit for a load circuit which can distinguish between an overcurrent generated at a load and a rush current generated at the time of turning on a semiconductor switch or switches provided on the downstream side of the semiconductor switch and can turn the semiconductor switch off only when the overcurrent is generated to thereby protect the load circuit. A comparator CMP | 10-06-2011 |
20120081825 | PROTECTION APPARATUS FOR LOAD CIRCUIT - A protection apparatus for a load circuit is provided which can miniaturize electric wires and semiconductor switches by using a switch circuit simulating the current interruption time characteristics of fuses. A conductor resistance r and a heat resistance R used in each of a heat generation temperature calculation expression and a heat dissipation temperature calculation expression are respectively changed into a pseudo conductor resistance r* and a pseudo heat resistance R*, then the heat generation amount and the heat dissipation amount of the electric wire are calculated, and current temperature of the electric wire is estimated. When the estimation temperature reaches allowable temperature, an electronic switch S | 04-05-2012 |
20150022930 | PROTECTION DEVICE FOR ELECTRICITY SUPPLY CIRCUIT - When a power switch is turned off, a protection device for an electricity supply circuit starts keeping time using a timer and turns on a disconnection flag. Then the protection device turns off the disconnection flag when the timer has counted a predetermined time. When the power switch is turned off, the disconnection flag does not subsequently turn off until the predetermined time has passed. Therefore, it is possible to prevent an excessive temperature increase in the power switch and prevent damage to the power switch. | 01-22-2015 |
20150029629 | PROTECTOR FOR ELECTRICITY SUPPLY CIRCUIT - A protector for an electricity supply circuit includes: a power switch for switching between connection and disconnection of the electricity supply circuit; a controller configured to output a switching command signal to the power switch in accordance with an input signal; and a current detector for detecting current flowing to the electricity supply circuit. The controller includes: a lower limit threshold determination unit configured to determine whether or not an estimated temperature of a power line has dropped below a lower limit threshold; a timer for counting the time that passes after a load has been turned off, when the load is turned off by the power switch; and a mode switching unit configured to switch the controller to a sleep mode when a predetermined time is counted by the timer and the lower limit threshold determination unit determines that the estimated temperature has dropped below the lower limit threshold. | 01-29-2015 |
20150029631 | PROTECTOR FOR ELECTRICITY SUPPLY CIRCUIT - A protector for an electricity supply circuit includes: a power switch capable to switch between connection and disconnection of the electricity supply circuit; a controller configured to output a switching command signal to the power switch in accordance with an input signal; and a current detector for detecting current flowing to the electricity supply circuit. The controller includes: a timer for counting the time that passes after a load has been turned off, when the load is turned off by the power switch; and a mode switching unit configured to switch the controller to a sleep mode when a predetermined time is counted by the timer. | 01-29-2015 |
20150138682 | SWITCHING CIRCUIT PROTECTOR - A switching circuit protector switches a semiconductor device ( | 05-21-2015 |
20150343969 | VEHICLE POWER SUPPLY CONTROL DEVICE - A power supply control device detects current that actually flowed through each load and a duty ratio of the current using a current detection unit and a duty ratio detection unit, and calculates an actual supply power value of each load using a power data calculation unit. A PWM control duty ratio is calculated by a duty ratio correction value calculation unit such that the calculated actual supply power value corresponds to a target power value of each load and it is set as the duty ratio of the PWM control by a PWM duty ratio control unit. Thus, even if resistance characteristics of each load or a wire harness connected to each load are varied by changes over time or environment, the PWM control duty ratio can be corrected according to the varied resistance characteristics, and power of the target power value is supplied to the load. | 12-03-2015 |