Vehicle-mounted dc-dc converter

Abstract

The invention provides a DCDC converter for vehicle use. When a calculated duty obtained through a feedback operation is within a specific range, a duty outside the specific range is adopted without increasing a difference from the operation result. When a calculated duty obtained through a feedback operation is within a modification target range, an arithmetic unit of a DCDC converter selects a predetermined value as a substitute and determines a usage duty based on the substitute. Whenever the calculated duty within the modification target range is obtained, the arithmetic unit updates a cumulative value by accumulating a value indicating a difference between the usage duty based on the substitute and the calculated duty. When a predetermined condition is met, the arithmetic unit modifies the usage duty by performing addition or subtraction on a part or whole of the cumulative value, and updates the cumulative value by subtracting the value used for modifying the usage duty.

Description

technical field [0001] The present invention relates to a DC-DC converter for vehicles. Background technique [0002] Patent Document 1 discloses an example of a PWM signal generating device. The purpose of this PWM signal generating device is to double the resolution of the PWM signal and output it with a simple circuit without setting the frequency of the reference clock to double. Specifically, the PWM signal generation device includes a first PWM output control circuit that outputs a PWM signal in response to a rising clock signal of a clock signal, a second PWM output control circuit that outputs a PWM signal in response to a falling clock signal of a clock signal, and switches these A switching circuit that controls the output of the circuit. [0003] Patent Document 1: Japanese Patent Laid-Open No. 2012-227692 [0004] However, the PWM signal generation device of Patent Document 1 is not a device that assumes a specific range longer than the period of the PWM signa...

AI Technical Summary

Problems solved by technology

[0004] However, the PWM signal generation device of Patent Document 1 is not a device that assumes a specific range longer than the period of the PWM signal as a non-setting range of the duty ratio (for example, the specific range is an unusable range where the duty ratio cannot be set. range of such devices)

Therefore, in the PWM signal generating device of Patent Document 1, in a situation where the duty ratio calculated by the feedback calculation is within a specific range (duty ratio non-setting range longer than the period of the PWM signal), it is impossible to take appropriate action

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