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Detection pulse generator, control chip and switching power source

A technology for detecting pulses and switching power supplies, applied to electrical components, output power conversion devices, and conversion equipment without intermediate conversion to AC, to achieve the effect of reducing output voltage undershoot and improving system efficiency

Active Publication Date: 2015-05-13
BCD (SHANGHAI) MICRO ELECTRONICS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, the present invention provides a detection pulse generator, a control chip and a switching power supply, to overcome the problem that the detection pulse in the prior art cannot take into account the situation that the load of the switching power supply is light load and heavy load

Method used

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  • Detection pulse generator, control chip and switching power source
  • Detection pulse generator, control chip and switching power source
  • Detection pulse generator, control chip and switching power source

Examples

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Effect test

Embodiment 1

[0053] Please refer to the attached figure 2 , is a schematic structural diagram of the first detection pulse generator disclosed in the embodiment of the present invention. This circuit is applied to a switching power supply controlled by Bang-Bang. The circuit may include: a switching signal cycle detection module 201 and a detection pulse generation module 202, wherein :

[0054] The signal representing the period of the current switch signal acts on an input terminal of the switch signal period detection module 201 , and the output terminal of the switch signal period detection module 201 is connected to the input terminal of the detection pulse generation module 102 .

[0055] It works as follows:

[0056] The switch signal period detection module 201 generates an equivalent switch period signal with the same period as the current switch signal according to the signal reflecting the period of the current switch signal. When the detection pulse generation module 202 dete...

Embodiment 2

[0061]At the beginning, the switching power supply first generates a detection pulse. When it is detected that the output voltage of the switching power supply is lower than the preset lower limit voltage, a switching signal is generated. Therefore, the detection pulse is generated first, and then the switching signal is generated. The above-mentioned embodiments only illustrate The detection pulse generation process after the first switch signal is generated does not illustrate the generation process of the detection pulse before the first switch signal is generated. Of course, the generation process of the detection pulse before the first switch signal can be compared with the prior art The process of generating the pulse is the same as in the prior art, so it is not repeated here one by one. The generation process of the detection pulse before the generation of the first switching signal can also be described as follows.

[0062] The embodiment of the present invention also...

Embodiment 3

[0076] In practical applications, there are many ways to implement each module in Embodiment 2, and each module will be introduced in detail below.

[0077] see Figure 4 , which is a circuit diagram of a detection pulse generation module provided in an embodiment of the present invention, the detection pulse generation module may include:

[0078] Oscillator 401, counter 402, encoder 403, first AND gate 404, D flip-flop 405, multiplexer 406, second AND gate 407 and trigger unit 408;

[0079] The output terminal of the oscillator 401 is connected with the clock input terminal Clk of the counter 402, the output terminal of the counter 402 is respectively connected with the input terminal of the multiplexer 406 one-to-one, and the output terminal of the counter 402 is connected with the input terminal of the encoder 403 respectively. Connected to one, the set signal acts on the set terminal S of the counter 402 and an input terminal of the first AND gate 404 respectively, the r...

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Abstract

An embodiment of the invention discloses a detection pulse generator, a control chip and a switching power source. A circuit comprises a switching signal period detection module and a detection pulse generation module. Signals embodying current switching signals act at an input end of the switching signal period detection module, an output end of the switching signal period detection module is connected with an input end of the detection pulse generation module, the switching signal period detection module generates equivalent switching period signals as same as the current switching signals in period according to the embodied current switching signal period, and the detection pulse generation module generates detection pulse with the period in positive correlation to the period of the equivalent switching period signals according to the equivalent switching period signals when the equivalent switching period signals are detected. In the embodiment, system efficiency of the switching power source can be improved.

Description

technical field [0001] The present invention relates to the technical field of switching power supply, and more specifically, relates to a detection pulse generator, a control chip and a switching power supply. Background technique [0002] Switching power supply has gradually developed into a mainstream regulated power supply due to its advantages of high efficiency, small size, and light weight. Its control mode can be divided into PID control and Bang-Bang control. [0003] see figure 1 , is the circuit diagram of the switching power supply controlled by Bang-Bang in the prior art, the switching power supply controlled by Bang-Bang includes a control chip 101, a diode D0, a diode D1, a diode D2, an output inductor L0, a resistor R0, a resistor R1, and a resistor R2 , capacitor Cout, capacitor Cin and capacitor C1, wherein the control chip 101 includes a driver 1011, a switch tube Q1, a detection pulse generator 1012 and a Bang-Bang controller 1013, and the control chip 1...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/08H02M3/10
Inventor 赵平安费瑞霞
Owner BCD (SHANGHAI) MICRO ELECTRONICS LTD
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