Load driving method and device
AssigneeDenso Corporation
InventorKouji Nakamura
Life of this patent
Estimating the term…
Abstract
A load driving device controls two motors by PWM signals. When a standard duty ratio of the PWM signals is 50% and a level of a drive instruction is the standard duty ratio, the standard duty ratio are output to the respective motors to provide a reverse phase relationship that the PWM signal of the standard duty ratio does not overlap. A continuous off-period and the standard PWM signal output when the level of the drive instruction is lower than the standard, and the continuous on-period and the standard PWM signal output when the level of the drive instruction is higher than the standard are changed over at the ratios corresponding to the level of the drive instruction.
Claims17
1-8. (canceled)
A load driving method for independently driving a plurality (n) of loads connected to a power source by a drive signal, the load driving method comprising:
- setting a standard duty ratio of a PWM signal within a range of 100/n % or lower;
- outputting the drive signal including only a standard PWM signal of the standard duty ratio when a level of a drive instruction corresponds to the standard duty ratio, in case energization times of the plurality of loads do not overlap with each other;
- outputting the drive signal including the standard PWM signal and a continuous non-energization period at a ratio corresponding to the level of the drive instruction, in case a duty ratio determined by the level of the drive instruction is lower than the standard duty ratio;
- and
- outputting the drive signal including the standard PWM signal and a continuous energization period at a ratio corresponding to the level of the drive instruction, in case the duty ratio determined by the level of the drive instruction is higher than the standard duty ratio.
A load driving device for independently driving a plurality (n) of loads connected to a power source by a drive signal, wherein the load driving device is configured to:
- set a standard duty ratio of a PWM signal within a range of 100/n % or lower;
- output the drive signal including only a standard PWM signal of the standard duty ratio when a level of a drive instruction corresponds to the standard duty ratio, in case energization times of the plurality of loads do not overlap with each other;
- output the drive signal including the standard PWM signal and a continuous non-energization period at a ratio corresponding to the level of the drive instruction, in case a duty ratio determined by the level of the drive instruction is lower than the standard duty ratio;
- and
- output the drive signal including the standard PWM signal and a continuous energization period at a ratio corresponding to the level of the drive instruction, in case the duty ratio determined by the level of the drive instruction is higher than the standard duty ratio.
Dependencies are inferred from the claim text.