Vehicle-mounted FM/AM radio set free from interference of switching power supply and anti-interference method thereof

A switching power supply, radio technology, applied in electrical components, transmission systems, etc., can solve the problems of interfering with radio, unable to completely shield low-frequency electromagnetic waves, limited effect, etc., to achieve the effect of simple control circuit
CN103248376AActive Publication Date: 2013-08-14延锋伟世通(重庆)汽车电子有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
延锋伟世通(重庆)汽车电子有限公司
Publication Date
2013-08-14

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Abstract

The invention provides a vehicle-mounted FM / AM radio set free from interference of a switching power supply and an anti-interference method thereof. The anti-interference method comprises the following steps: AM (MW) wave band is subdivided into a plurality of sub frequency band; a microprocessor, and a switching power supply which works at less than 1 MHz and is capable of flexibly switching working frequency are utilized; and two different working frequencies of the switching power supply are alternately adopted. As a result, the inherent advantages of the switching power supply, such as low calorific value and high reliability are maintained, serious fundamental wave interference and harmonic wave interference of the working frequency of the built-in switching power supply to FM / AM (MW) reception circuit are eliminated, and the reception result of the type of radio set is greatly improved.
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Description

technical field

[0001] The invention relates to the technical field of a radio signal receiving device and its anti-electromagnetic interference, in particular to a vehicle-mounted FM / AM radio capable of avoiding the interference of a switching power supply and an anti-interference method thereof. Background technique

[0002] Modern car audio has more and more functions and more and more complex circuits, but its internal space is very limited. In order to reduce the internal temperature, improve the reliability of the audio system and prolong its service life, in addition to using a high-quality radiator with a relatively large thickness and surface area, it is also necessary to use as many high-efficiency circuits as possible to reduce the heat generated by the internal circuit. However, increasing the heat sink will not only be limited by the structural size of the whole machine, but also increase the cost; to reduce the heat generation of the circuit, in addition to usi...

Claims

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