Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Switch control circuit and method for preventing voltage drop caused by overlarge load

A switch control circuit and voltage drop technology, applied in the direction of electronic switches, circuits, electrical components, etc., can solve problems such as inflexibility, increased cost, and design incompatibility, and achieve the effect of reducing hardware costs and suppressing load instantaneous current

Pending Publication Date: 2022-01-04
FUZHOU ROCKCHIP SEMICON
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method increases the cost, is not flexible, and is not compatible in design

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
  • Switch control circuit and method for preventing voltage drop caused by overlarge load
  • Switch control circuit and method for preventing voltage drop caused by overlarge load
  • Switch control circuit and method for preventing voltage drop caused by overlarge load

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Please refer to Figure 1 to Figure 3 , Embodiment 1 of the present invention is:

[0051] A switch control circuit for preventing voltage drop caused by excessive load includes a switch circuit and a control circuit.

[0052] like figure 1As shown, the switching circuit includes a PMOS transistor Q1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first resistor R1, and a second resistor R2. The source s of the PMOS transistor Q1 is simultaneously connected to the power supply input terminal Vin, the second capacitor One end of the second capacitor C2, one end of the third capacitor C3, and one end of the second resistor R2 are electrically connected, the drain d of the PMOS transistor Q1 is electrically connected to one end of the first capacitor C1 and the power supply output terminal Vout at the same time, and the gate of the PMOS transistor Q1 The pole g is electrically connected to one end of the first resistor R1, the other end of the secon...

Embodiment 2

[0062] Please refer to Figure 4 , the second embodiment of the present invention is:

[0063] A switch control method for preventing voltage drop caused by excessive load, comprising the following steps:

[0064] Receive the input voltage of the power supply input terminal and the PWM signal of the signal control terminal;

[0065] When the PWM signal is at a high level, the switching transistor is turned on, which makes the PMOS tube turn on, and the input voltage is output to the load device connected to the output terminal of the power supply. On the contrary, when the PWM signal is at a low level, the switching transistor is turned off, so that the PMOS tube is turned off. , the input voltage stops outputting, and this cycle continues until the load instantaneous current Iout of the load device reaches the operating current, and the signal control terminal maintains a high-level signal.

[0066] To sum up, the present invention provides a switch control circuit and meth...

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

PropertyMeasurementUnit
electrical resistanceaaaaaaaaaa
electrical resistanceaaaaaaaaaa
electrical resistanceaaaaaaaaaa
Login to View More

Abstract

The invention discloses a switch control circuit and method for preventing voltage drop caused by overlarge load. The switch control circuit comprises a switch circuit and a control circuit, wherein the switching circuit comprises a PMOS tube and a first capacitor, a source electrode of the PMOS tube is electrically connected with the power supply input end, and a drain electrode of the PMOS tube is electrically connected with one end of the first capacitor and the power supply output end; the control circuit comprises a switching triode, a base electrode of the switching triode is electrically connected with the signal control end, a collector electrode of the switching triode is electrically connected with a grid electrode of the PMOS tube, and the emitter of the switching triode and the other end of the first capacitor are grounded; a switch control signal of the signal control end is a PWM signal, wherein the duty ratio of the PWM signal is increased along with the increase of the load instantaneous current, and the frequency of the PWM signal is reduced along with the increase of the load instantaneous current. The frequency and the duty ratio of the PWM signal are flexibly controlled according to the load instantaneous current of the load equipment, hardware does not need to be added, the first capacitor does not need to be replaced according to the load requirement, and therefore different load equipment can be compatible, and the hardware cost is reduced.

Description

technical field [0001] The invention relates to the technical field of circuit control, in particular to a switch control circuit and method for preventing voltage drop caused by excessive load. Background technique [0002] In the application of electronic products, in order to control the power on and off sequence of each module, the electronic switch control circuit is often used to control the power on and off of the power supply. When the switch is turned on, the instantaneous current of the relatively large load is often very large, causing the input voltage to be instantaneously controlled. Pulling down, this situation can easily cause the failure of the module or the whole machine, and even damage the power supply components of the system in severe cases. In order to solve this problem, the common practice is to add resistance and capacitance at the control end of the switch, and use the resistive capacitance device to delay the switching speed, reduce the instantane...

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): H03K17/687H03K17/60H03K7/08
CPCH03K17/687H03K17/60H03K7/08
Inventor 叶青海庄惠明
Owner FUZHOU ROCKCHIP SEMICON
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com