Unlock instant, AI-driven research and patent intelligence for your innovation.

Control circuit of DC/DC boost system

A technology of boosting system and control circuit, applied in the direction of control/regulating system, electrical components, regulating electrical variables, etc., can solve the problems of high operating frequency of the system, inability to achieve better light load efficiency, etc. Effect

Pending Publication Date: 2021-12-28
无锡裕芯电子科技有限公司
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As shown in the figure, since the minimum on-time (Fixed MIN ON Time) is fixed, for application scenarios with different voltages V1 and V2, the fixed minimum on-time is usually designed to be very small, resulting in the system under light load The working frequency is too high to achieve better light load efficiency

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Control circuit of DC/DC boost system
  • Control circuit of DC/DC boost system
  • Control circuit of DC/DC boost system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] see image 3 , image 3 Shown is a schematic diagram of a preferred embodiment of the control circuit of the DC / DC step-up system of the present invention. As shown in the figure, the control circuit of the DC / DC step-up system includes a first voltage dividing resistor RFB1, a second voltage dividing resistor RFB2, a voltage stabilizing capacitor C1 for V1, a voltage stabilizing capacitor C2 for V2, Voltage source DC, inductor L1, first transistor Q1, second transistor Q2, constant on-time module, gating module T1, oscillator module OSC, error amplifier module EAMP, comparator module PWMCMP, logic control module LOGIC, drive module DRIVER and current zero-crossing comparison module ZCDCMP; the voltage V1 is the voltage signal at the input end of the control circuit, and the voltage V2 is the voltage signal at the output end of the control circuit, and the voltage V1 is usually smaller than the voltage V2.

[0045] Specifically, the inductor L1 is connected between th...

Embodiment 2

[0065] In the embodiment of the present invention, by adding an on-off pre-control module, when the current flowing through the first transistor Q1 is greater than a preset current threshold, the on-off pre-control module controls the gating module T1 An output of the constant on-time module is received. That is, the conduction time of the first transistor Q1 must not only satisfy TON>=TOSC*(V2-V1) / V2, but also satisfy that the conduction current of the conduction Q1 reaches a set current value.

[0066] Specifically, the on-off pre-control module includes a logic gate and a current monitoring module; the current detection module includes a zeroth transistor Q0, a comparator circuit CLCMP and a current source IOC; an input terminal of the logic gate is connected to the The output terminal of the constant on-time module, one input terminal of the logic gate is connected to the output terminal of the comparator circuit CLCMP, and the zeroth transistor Q0 is a mirror transistor o...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A control circuit of a DC / DC boost system is used for boosting a voltage signal V1 into a voltage signal V2 and outputting the voltage signal V2. A first transistor Q1, a second transistor Q2, an inductor L1, a constant conduction time module, a gating module T1, a PWM generation module, a boost system driving control module and a current zero-crossing comparison module ZCDCMP are included; the gating module T1 outputs a PWM signal generated by the PWM generation module or a signal output by the constant conduction time module according to a received detection result of the current zero-crossing comparison module ZCDCMP on the working mode of the same boost load; and the boost system driving control module receives the output of the gating module T1 to generate a signal CLKP for controlling the on-off of the second transistor Q2 and a signal CLKN for controlling the on-off of the first transistor Q1 so as to ensure that the on-off time of the first transistor Q1 is the fixed on-time set by the constant on-time module under the light load. Therefore, the boost system in a heavy load mode works in a fixed frequency mode, and the boost system in a light load mode works in a constant conduction time mode.

Description

technical field [0001] The invention belongs to the technical field of circuit design and relates to a control circuit of a DC / DC step-up system. Background technique [0002] The control circuit of the DC / DC boost system is more and more widely used, for example, in the application scenarios of power boosting such as LED lighting, mobile phones, earphones and wearable devices. In order to make the DC / DC boost system work in the power saving mode, the industry usually uses a control circuit to detect and control the DC / DC boost system to work in the light load mode or the heavy load mode. [0003] see figure 1 , figure 1 Shown is a schematic diagram of a control circuit of a DC / DC step-up system in the prior art. As shown in the figure, the control circuit includes a first voltage dividing resistor RFB1, a second voltage dividing resistor RFB2, a voltage stabilizing capacitor C1 for V1, a voltage stabilizing capacitor C2 for V2, an inductor L1, a first transistor Q1, a se...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/156H02M1/088
CPCH02M3/156H02M1/088
Inventor 邵超
Owner 无锡裕芯电子科技有限公司