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Device and method for reducing electromagnetic interference of dc-dc power supply

A DC-DC, electromagnetic interference technology, applied in output power conversion devices, electrical components, conversion equipment without intermediate conversion to AC, etc., can solve problems such as electromagnetic interference, instrument equipment failure, interference, etc., to facilitate charging current The effect of size adjustment, electromagnetic interference amplitude reduction, and sub-harmonic component reduction

Active Publication Date: 2021-07-27
四川蕊源集成电路科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the center frequency of the signal output by the oscillator of the common DC-DC power supply is relatively constant. Due to the switch of the power device, electromagnetic interference phenomenon is inevitable: when switching high-speed switching, the frequency of the oscillator output signal is easy to be different from that of the power device. Coupling between frequencies generates some sub-harmonic components, forming electromagnetic interference (EMI)
Electromagnetic interference may cause interference to communication signals, electronic equipment, etc., causing equipment failure or damage, and may even endanger human health

Method used

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  • Device and method for reducing electromagnetic interference of dc-dc power supply
  • Device and method for reducing electromagnetic interference of dc-dc power supply
  • Device and method for reducing electromagnetic interference of dc-dc power supply

Examples

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Embodiment 1

[0051] This embodiment discloses a device for reducing electromagnetic interference of a DC-DC power supply, including: a driving circuit, a first current mirror, a second current mirror, a counter and a latch. The drive circuit is controlled to generate a drive current. In some embodiments, the driving circuit generates a driving current when the first enabling signal QN is an on signal, and does not generate a driving current when the first enabling signal QN is an off signal. The first current mirror and the second current mirror respectively mirror the driving current of the driving circuit to charge the first capacitors respectively. The output terminal of the latch obtains the inversion signal OSCB through the first inverter, and the counter counts the pulses of the inversion signal OSCB cyclically to generate several records, and controls the second current mirror to charge the first capacitor according to the counting speed In this way, the first current mirror acts a...

Embodiment 2

[0061] This embodiment discloses a device for reducing electromagnetic interference of a DC-DC power supply, comprising: a drive circuit, a first current mirror, a second current mirror, a counter and a latch.

[0062] Such as figure 1 As shown, the drive circuit includes a first P-type field effect transistor MP1, a second P-type field effect transistor MP2, a third P-type field effect transistor MP3, a fourth P-type field effect transistor MP4, a first N-type field effect transistor MN1 , the second N-type field effect transistor MN2 and the third N-type field effect transistor MN3. The source of the second P-type field effect transistor MP2 is connected to the power supply VCC, the gate is grounded, and the drain is connected to the source of the third P-type field effect transistor MP3. The gate of the third P-type field effect transistor MP3 is connected to the drain, and the drain is connected to the drain of the third N-type field effect transistor MN3. The source of...

Embodiment 3

[0073] This embodiment discloses a method for reducing electromagnetic interference of a DC-DC power supply, including:

[0074] A. Generate drive current.

[0075] By pulling down the potential at one end of the impedance element, a potential difference is generated at both ends of the impedance element, and a driving current is generated on the impedance element.

[0076] The behavior of the pull-down potential can be realized by designing the pull-down current circuit. The pull-down current circuit can be turned on or off by the first enable signal. Such as figure 1 As shown, in one embodiment, the fourth P-type field effect transistor MP4, the first N-type field effect transistor MN1, the second N-type field effect transistor MN2, and the third N-type field effect transistor MN3 constitute a pull-down current circuit. The sources of the four P-type field effect transistors MP4 are connected to the second enabling signal IB, the gates are connected to the gate of the fi...

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Abstract

The invention discloses a device and a method for reducing electromagnetic interference of a DC-DC power supply. The driving circuit is controlled to generate the driving current, the first current mirror and the second current mirror respectively mirror the driving current to charge the first capacitor, the latch releases the high-level time latch for the first point capacitor, and the output signal of the latch is reversed Finally, the inversion signal is obtained, and the inversion signal and the signal output by the oscillator together control the discharge of the first capacitor, the counter performs cyclic counting on the inversion signal, and controls the charging speed of the first capacitor by the second current mirror according to the count, and the inversion signal is inverted again to obtain two The first flip signal and the second flip signal are used as the final output signal. The invention can periodically change the center frequency of the DC-DC power supply, reduce the amplitude of electromagnetic interference generated at each frequency point, and align the phases of the final output signal and the oscillator output signal.

Description

technical field [0001] The invention relates to the technical field of integrated circuit power management, in particular to a device and method for reducing electromagnetic interference of a DC-DC power supply. Background technique [0002] At present, the center frequency of the signal output by the oscillator of the common DC-DC power supply is relatively constant. Due to the switch of the power device, electromagnetic interference phenomenon is inevitable: when switching high-speed switching, the frequency of the oscillator output signal is easy to be different from that of the power device. The coupling between frequencies generates some sub-harmonic components, forming electromagnetic interference (EMI). Electromagnetic interference may cause interference to communication signals, electronic equipment, etc., resulting in failure or damage to equipment, and may even endanger human health. Contents of the invention [0003] The object of the invention of the present i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/07H02M1/44
CPCH02M1/44H02M3/07
Inventor 李浩森袁小云
Owner 四川蕊源集成电路科技有限公司
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