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

Circuit control method and circuit control device

A circuit control and circuit technology, applied in the field of communications, can solve problems such as no solution and output voltage reduction, and achieve the effect of improving work efficiency and stability

Inactive Publication Date: 2013-06-05
ZTE CORP
View PDF3 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method of improving light load efficiency is that if the load current changes suddenly during the OFF period, the output voltage will be greatly reduced.
[0011] Aiming at the problems existing in the switching power supply in the related art when it is in the light-load state, no effective solution has been proposed so far

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
  • Circuit control method and circuit control device
  • Circuit control method and circuit control device
  • Circuit control method and circuit control device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Image 6 It is a schematic diagram applied to a BUCK step-down circuit according to the first embodiment of the present invention Figure one ,Such as Image 6 As shown, the circuit includes: DC input power supply VI, upper tube Q1, lower tube Q2, inductor L1, a current detection unit, an output control signal unit, a switching frequency reduction unit, a switch drive unit, a feedback compensation unit 1 and feedback Compensation unit 2. Among them: the DC power supply VI has a positive terminal and a negative terminal (ground); the drain of the upper tube Q1 is connected to the positive terminal of the DC power supply, the source is connected to the drain of the lower tube Q2 as SW (switching node), and the source of the lower tube Q2 is grounded. The gates of Q1 and Q2 are connected to the switch drive unit; one end of the inductor L1 is connected to the switch node, and the other end is connected to the load; the current detection unit is composed of R1, R2, and operat...

Embodiment 2

[0054] Figure 7 It is a schematic diagram applied to the BUCK step-down circuit according to the second embodiment of the present invention Figure II ,Such as Figure 7 As shown, the main structure is basically the same as Image 6 The same, the difference is: the current detection unit uses the current detection IC; the pulse width modulation control chip (Pulse Width Modulator Integrate Circuit, referred to as PWM IC) integrates the switching frequency reduction unit and the switching drive unit, and the PWM IC can pass the frequency ( Freq) An external resistor is connected to the pin to set the switching frequency.

[0055] based on Figure 7 The circuit diagram for improving the light-load efficiency of the switching power supply is as follows: when the circuit is working under heavy load, the current detection IC detects the voltage drop on L1 and outputs it to the comparator U2 input positive, this voltage drop is greater than the comparator input With negative VREF, the ...

Embodiment 3

[0057] Figure 8 It is a schematic diagram applied to the BUCK step-down circuit according to the third embodiment of the present invention Figure three ,Such as Figure 8 As shown, the main structure is basically the same as Figure 7 The same, the difference is: PWM IC integrates current detection function, with current detection function pin ISENSE. The rest of the structure and work flow are the same as in the second embodiment, so the details are not repeated here.

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

The invention discloses a circuit control method and a circuit control device. The circuit control method includes steps of ensuring a load condition in the circuit turns into a light load state, reducing turning-on and turning-off frequency of a switch power source in the circuit, and selecting a feedback compensation unit corresponding to the light load state as a unit for feedback of compensation in the circuit. According to the circuit control method and the circuit control device, in related technologies, the problems of the switch power source in the light load state are solved, and operating efficiency and stability of the circuit comprising the switch power source are improved.

Description

Technical field [0001] The present invention relates to the field of communications, and in particular to a circuit control method and device. Background technique [0002] The switching power supply gradually replaced the traditional linear power supply due to its high efficiency, but the efficiency of the switching power supply will drop sharply at light load. This is because the circuit loss is little affected by the decrease of the load current. The switching power supply loss is mainly concentrated on the switching device, and the switching tube loss can be expressed by the following formula: [0003] P LOSS ≈P ON +P SW , [0004] P in the above formula ON Is conduction loss, P SW Is the switching loss, which is determined by the following formulas: [0005] P ON =I 2 *r ds(ON) , P SW =V*I*t CROSS *f SW , [0006] Where I is the load current, r ds(ON) Is the on-resistance of the switch tube. V is the voltage across the drain source of the switch tube, t CROSS Is the s...

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): H02M3/155
Inventor 占伟雷彦
Owner ZTE CORP