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Signal generating circuit and power supply device

A signal generation circuit, PWM signal technology, applied in the output power conversion device, electrical components, adjusting electrical variables and other directions, can solve problems such as noise

Active Publication Date: 2019-05-21
AUTONETWORKS TECH LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] On the other hand, as another issue related to PWM control, there is the problem of noise caused by fixing the PWM cycle

Method used

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  • Signal generating circuit and power supply device
  • Signal generating circuit and power supply device
  • Signal generating circuit and power supply device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Next, Example 1 obtained by actualizing the present invention will be described.

[0041] figure 1 The illustrated vehicle power supply system 100 mainly includes a power supply device 90 composed of a signal generation circuit 1 and a voltage conversion device 2, a battery 3 as a power supply unit, and a load 4 as a power supply target. The vehicle-mounted power supply system is configured to supply electric power to the vehicle-mounted load 4 .

[0042] The battery 3 is constituted by a known electric storage unit such as a lead storage battery, for example, and generates a predetermined voltage. The high-potential terminal of the battery 3 is electrically connected to the first conductive path 31 , and the low-potential terminal of the battery 3 is electrically connected to the ground, for example.

[0043] The voltage conversion device 2 is connected to an external battery 3 and a load 4 , and has a function of stepping down the DC voltage from the battery 3 and s...

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PUM

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Abstract

Provided is a technique with which the cycle of a PWM signal can be varied, and with which a minimum unit of ON time set in a PWM signal generating unit can be made effectively smaller than the actualminimum unit. A cycle setting unit (105) of a signal generating circuit (1) varies the value of a set cycle. A first determining unit (104) determines a first ON time ty1 based on a first duty ratioD1 obtained by correcting a ratio between a target ON time and a reference cycle using a correction value, and based on a set cycle value Ts. A second determining unit (107) determines a set candidatevalue close to the first ON time ty1 as a second ON time ty2. A generating unit (16) generates a PWM signal reflecting the set cycle value Ts and the second ON time ty2. A third determining unit (109) determines the correction value to be used next time by the first determining unit (104), on the basis of the target ON time ta, the reference cycle Tb, and the previous correction value, set cyclevalue Ts and second ON time ty2.

Description

technical field [0001] The invention relates to a signal generating circuit and a power supply device. Background technique [0002] Conventionally, a voltage conversion device that converts a voltage by driving a switching element with a PWM (Pulse Width Modulation) signal has been widely used. In this PWM control method voltage conversion device, for example, a voltage command value is calculated based on a target voltage value, and a value corresponding to the calculated voltage command value is set to a PWM signal generator to generate The given value corresponds to the duty of the PWM signal. By thus changing the duty of the PWM signal for driving the switching element in accordance with the target voltage value, an output voltage corresponding to the target voltage value is obtained. [0003] Here, when the minimum unit (ie, the minimum increment) of the value that can be set for the PWM signal generator is large, the duty of the PWM signal cannot be changed smoothly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/155
CPCH02M3/155H02M3/157H02M3/156H03K7/08H02M1/0025H02M3/33515H02M7/5387
Inventor 东诚阿部武德
Owner AUTONETWORKS TECH LTD