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Spread spectrum clock signal generating circuit and switching power supply converter

A clock signal and spread spectrum technology, which is applied in the field of switching power converters, can solve the problems of poor attenuation effect of electromagnetic wave interference, and achieve good anti-electromagnetic interference, good attenuation effect, and good effect

Pending Publication Date: 2018-10-26
SHANGHAI AWINIC TECH CO LTD
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  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the present invention provides a spread-spectrum clock signal generating circuit and a switching power converter to solve the problem in the prior art that the attenuation effect of the triangular-wave spread-spectrum clock signal on electromagnetic interference is poor

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  • Spread spectrum clock signal generating circuit and switching power supply converter
  • Spread spectrum clock signal generating circuit and switching power supply converter
  • Spread spectrum clock signal generating circuit and switching power supply converter

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Embodiment Construction

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0044] The embodiment of the present invention provides a spread spectrum clock signal generation circuit, such as figure 1 As shown, it includes a first reference voltage source 10, an adjustable current source unit 11, a counter 12 and an oscillator 13, wherein, as figure 2 As shown, the oscillator 13 includes a comparator 130 and a first capacitor 131 .

[0045] Wherein, the first reference voltage source 10 is used to provide the reference voltage to the...

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Abstract

The invention provides a spread spectrum clock signal generating circuit and a switching power supply converter, comprising a first reference voltage source, an adjustable current source unit, a counter and an oscillator, wherein the oscillator comprises a comparator and a first capacitor; the adjustable current source unit is used for charging or discharging the first capacitor, a charging current output to the first capacitor is gradually increased in a charging process and a discharging current output to the first capacitor is gradually increased in a discharging process, or the charging current output to the first capacitor is gradually reduced in the charging process and the discharging current output to the first capacitor is gradually increased in the discharging process, so that aspread spectrum clock signal output by the comparator is a triangular sawtooth wave clock signal. Compared with a triangular wave spread spectrum clock signal, the triangular sawtooth wave spread spectrum clock signal has better attenuation effect on electromagnetic wave interference, thus anti-electromagnetic interference effect of the spread spectrum clock signal generating circuit provided by the invention is better.

Description

technical field [0001] The present invention relates to the technical field of switching power converters, and more specifically, to a spread spectrum clock signal generation circuit and a switching power converter. Background technique [0002] A switching power converter is a device that converts a fixed DC voltage source into a controllable DC voltage source. It has been widely used in battery-powered systems such as automotive electronics and handheld devices. The switching power converter adopts the control method of pulse width modulation. However, as the switching frequency continues to increase, a large number of harmonic components contained in its high-frequency switching waveform propagate through the transmission line and the space electromagnetic field, causing conduction and radiation interference, that is, electromagnetic interference. (EMI). [0003] Since the spread spectrum technology can effectively attenuate the electromagnetic wave interference generate...

Claims

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Application Information

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IPC IPC(8): H03K4/08H02M1/44
CPCH02M1/44H03K4/08
Inventor 严之嶽
Owner SHANGHAI AWINIC TECH CO LTD
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