Control method and controller

A control method and controller technology, applied in the control field, can solve the problems of low circuit switching frequency, unfavorable circuit dynamic performance, increased output capacitance, etc., and achieve the effect of realizing high frequency, reducing circuit cost and reducing capacity.

Active Publication Date: 2013-12-04
MORNSUN GUANGZHOU SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although the off-time modulation control method can effectively reduce the standby power consumption of the circuit, it will also have an adverse effect on the dynamic performance of the circuit. For example, the circuit suddenly increases the load to full-load output under the standby condition. Under the condition that the switching frequency of the circuit is very low, the primary side feedback control IC needs to be able to detect the output voltage after the main power switch tube is turned off in the next cycle, which means that the circuit needs to pass close to one switching cycle to adjust the output voltage. At this time, the switching frequency drops to 1KHz, then the circuit will need a delay time of about 1mS to sample the output voltage. Within the delay time, the output energy will be provided by the output capacitor. If the capacity of the output capacitor is small, the output voltage will be undershooted. The amplitude will be relatively large, in order to reduce the output voltage undershoot amplitude, the output capacitance needs to be increased

Method used

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Examples

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no. 1 example

[0052] Figure 5 It is a simplified block diagram of an isolation transmission controller for improving the dynamic response speed of a switching power converter according to the first embodiment of the present invention, including a voltage sampling module 101, a voltage comparison module 102, a pulse signal generation module 103, an isolation transmission module 104, a pulse Signal receiving module 105.

[0053] The voltage comparison module 102 and the pulse signal generation module 103 can be integrated in the chip 100 , and the chip 100 includes at least ports 106 , 107 , 108 , and 109 . The pulse signal receiving module 105 is located on the chip 200 , and the chip 200 at least includes ports 110 , 111 , 112 , 113 , 114 , 115 .

[0054] like Figure 5 As shown, the voltage sampling module 101 detects the size of the output voltage, and outputs a voltage feedback signal 116 to the voltage comparison module 102. The voltage sampling module 101 is mainly composed of volta...

Embodiment 2

[0064] Image 6 It is a functional block diagram of the second embodiment of the present invention, including a voltage sampling module 201 , a voltage comparison module 202 , a pulse signal generating module 203 , an isolation transmission module 204 , and a pulse signal receiving module 205 . The voltage comparison module 202 and the pulse signal generation module 203 can be integrated in the chip 300 , and the chip 300 includes at least ports 206 , 207 , 208 , and 209 . The pulse signal receiving module 205 can be integrated in the chip 400 , and the chip 400 includes at least ports 210 , 211 , 212 , 213 , 214 , and 215 .

[0065] The working principle of the second embodiment is the same as that of the first embodiment, the only difference is that the isolation transmission module is implemented in the form of capacitive isolation, and the connection relationship and implementation principle will not be repeated here.

[0066] The isolation transmission module 204 is main...

Embodiment 3

[0068] Figure 7 It is a functional block diagram of the third embodiment of the present invention, including a voltage sampling module 301 , a voltage comparison module 302 , a pulse signal generating module 303 , an isolation transmission module 304 , and a pulse signal receiving module 305 . The voltage comparison module 302 and the pulse signal generation module 303 are located on the chip 500 , and the chip 500 includes at least ports 306 , 307 , 308 , and 309 . The pulse signal receiving module 305 is located on the chip 600 , and the chip 600 includes at least ports 310 , 311 , 312 , 313 , 314 , and 315 .

[0069] The working principle of the third embodiment is the same as that of the first embodiment, the only difference is that the isolated transmission module is implemented in the form of optocoupler isolation, and the connection relationship and implementation principle will not be repeated here.

[0070]The isolation transmission module 304 is mainly realized by ...

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Abstract

The invention discloses a control method. The control method includes detecting a real-time output voltage of an output end of a converter of a switch power supply and sampling and outputting a feedback voltage signal relevant to the amplitude of the output voltage; comparing the feedback voltage signal to a reference voltage signal, judging whether the output voltage is higher than a set value or not in a dynamic load jumping procedure, and outputting a logic control level if the output voltage is higher than the set value; enabling the logic control level to trigger and output a pulse signal with a fixed pulse width and transmitting the pulse signal with the fixed pulse width from a secondary side to a primary side in an isolation manner; enabling the pulse signal which is transmitted to the primary side to trigger and output a quick reset signal, switching a working mode of a master control IC (integrated circuit) in an off-time modulation mode, quickly resetting an internal oscillator of the IC and enabling the circuit to quickly enter a next switch cycle. The control method has the advantage that the dynamic response speed of the converter of the switch power supply can be increased by the aid of the control method.

Description

technical field [0001] The invention relates to a control method, in particular to a control method for improving the dynamic response speed of a primary-side feedback switching power supply converter with high requirements on output dynamic performance; the invention also relates to a controller for realizing the above control method. Background technique [0002] The primary side feedback flyback switching power supply control technology was proposed in the US patent US4302803 on November 24, 1981. Because of its simple circuit, low cost, and the characteristics of the feedback loop without optocoupler and 431, the cost and volume requirements are relatively high. It is widely used in the occasions of micro power output (such as mobile phone charger, LED driver). [0003] The primary-side feedback flyback circuit is also realized based on the working principle of the flyback converter. Most of the primary-side feedback flyback circuits work in discontinuous mode (DCM). Ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
Inventor 周耀彬余凤兵唐盛斌
Owner MORNSUN GUANGZHOU SCI & TECH
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