CN204810142U - High frequency switching power supply's anti -jamming circuit - Google Patents
High frequency switching power supply's anti -jamming circuit Download PDFInfo
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- CN204810142U CN204810142U CN201520448971.2U CN201520448971U CN204810142U CN 204810142 U CN204810142 U CN 204810142U CN 201520448971 U CN201520448971 U CN 201520448971U CN 204810142 U CN204810142 U CN 204810142U
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- high frequency
- power supply
- lead acid
- switching power
- radio reception
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Abstract
The utility model relates to a high frequency switching power supply's anti -jamming circuit, its radio reception amplifier circuit who includes high frequency switching power supply and radio, still including the lead acid battery who is used for filtering, the anodal positive voltage input end of connecting the anodal of lead acid battery and radio reception amplifier circuit of high frequency switching power supply, lead acid battery's negative pole and radio reception amplifier circuit's negative voltage input end are connected to high frequency switching power supply negative pole. The utility model discloses the advantage lies in, through being connected between lead acid battery and the wire, forms the filter circuit of two pi types, does not need expensive other anti -interference devices that sets up, adopts low -cost lead acid battery just can reach fine anti -interference effect.
Description
Technical field
The utility model relates to a kind of power circuit, particularly relates to a kind of anti-jamming circuit of high frequency switch power.
Background technology
Current technique broadcast receiver is a kind of small-sized radio receiver, is mainly used in accepting radio broadcast program, listens to radio-transmitting station, is mainly divided into amplitude-modulation receiver (AM) and FM receiver (FM).AM and amplitude modulation(PAM) (AmplitudeModulation), also referred to as amplitude modulation, by changing the amplitude of output signal, can realize the object of transmission information.Generally become certain functional relation in the changes in amplitude of the high-frequency signal of modulated terminal output with primary signal, carry out demodulation at demodulating end and export primary signal.The largest benefit of this modulation system is that modulation and demodulation are very simple, and only need a diode and a capacitor, major defect is that distortion is large, more responsive to interference ratio, is a kind of more ancient technology comparatively speaking.Frequency modulation (FrequencyModulation) be a kind of with the Instantaneous frequency variations of carrier wave to represent the adjustment mode of information.The advantage of FM is that antijamming capability is strong, and radio reception is effective.
High frequency switch power is widely used in electronic circuit because of features such as volume is little, lightweight, high energy efficiencies.But, due to the operating frequency of Switching Power Supply in a few KHz to number megahertz, very high voltage, current changing rate can be produced, cause Switching Power Supply to produce very strong electromagnetic interference (EMI).EMI interference has very wide frequency range, not only can cause interference to electrical network, also directly can affect the normal work of other power consumption equipments, and the electromagnetic wave of radiation causes electromagnetic pollution to space, this electromagnetic interference is particularly serious on the impact of AM/FM radio system, if do not take measures, the AM/FM broadcast receiver near Switching Power Supply can not receive radio station substantially.
Utility model content
The utility model object is to provide a kind of high frequency switch power anti-jamming circuit solved the problem.
In order to achieve the above object, the technical scheme that adopts of the utility model is as follows:
An anti-jamming circuit for high frequency switch power, it comprises high frequency switch power and wireless radio reception amplifying circuit; Also comprise the storage battery for filtering, described high frequency switch power positive pole connects the positive pole of storage battery and the positive voltage input of radio reception amplifying circuit; High frequency switch power negative pole connects the negative pole of storage battery and the negative voltage input of radio reception amplifying circuit.
Preferably, described storage battery is lead acid accumulator.
The utility model advantage is, by the connection between lead acid accumulator and wire, forms the filter circuit of two π types, does not need high cost to arrange other anti-interference devices, adopts the lead acid accumulator of low cost just can reach good anti-jamming effectiveness.
Accompanying drawing explanation
Fig. 1 is structured flowchart of the present utility model.
Fig. 2 is equivalent circuit diagram of the present utility model.
Embodiment
Below, by reference to the accompanying drawings and embodiment, the utility model is described further:
As shown in Figure 1, the utility model includes high frequency switch power and wireless radio reception amplifying circuit; Also comprise the lead acid accumulator for filtering, the positive pole of described high frequency switch power connects the positive pole of lead acid accumulator and the positive voltage input of radio reception amplifying circuit; The negative pole of high frequency switch power connects the negative pole of lead acid accumulator and the negative voltage input of radio reception amplifying circuit.Radio reception amplifying circuit is the ripe circuit module of broadcast receiver telogenesis, and it is made up of antenna, AM/FM radio module, prime amplification module and power amplifier module.
Operation principle is that high frequency switch power is connected to lead acid accumulator by the first wire, and radio reception amplifying circuit is connected to lead acid accumulator by the second wire.Often organize wire and can be equivalent to an inductance, lead acid accumulator can be equivalent to a bulky capacitor, and because lead acid accumulator capacitance is large, between its negative pole and the earth, almost potential-free is poor, is equivalent to an accurate physical features, has very strong filter action.Inductance has good inhibitory action to the interference of high frequency, and the Main Function of electric capacity is filtering, and when voltage alternating, due to the charging effect of electric capacity, the voltage at two ends can not suddenly change, and just ensure that the steady output of voltage.Its equivalent electric circuit as shown in Figure 2.Output rectification filter electric capacity C1, the first wire equivalent reactance L1 of high frequency switch power inside and lead acid accumulator equivalent capacity C2 form first order π type filter circuit.And the input capacitance C3 of lead acid accumulator equivalent capacity C2, the second wire equivalent reactance L2 and radio reception amplifying circuit inside forms second level π type filter circuit, between high frequency switch power and radio reception amplifying circuit, just have two-stage π type filter circuit like this, the High-frequency Interference of π type filtering to Switching Power Supply of two-stage has extraordinary inhibitory action.
That is, when Switching Power Supply connects civil power, it is responsible for powering to lead acid battery charge and radio reception amplifying circuit, in this case, AM/FM radio reception part is very high to the requirement of Switching Power Supply, the high frequency radiation interference of Switching Power Supply directly can cause serious impact to the radio reception effect of AM/FM, gently then affects the radio reception effect of AM/FM, heavy then do not receive radio station.For a long time, the power supply of AM/FM system always is employing linear power supply, seldom use Switching Power Supply to carry out and power to AM/FM system, in fact the present embodiment is put forth effort on and in AM/FM system, how to be adopted Switching Power Supply to carry out powering and how to process its high frequency radiation interference problem produced.
Adopt the benefit of connecting line construction of the present embodiment to be to spend extra cost both can complete filter effect as shown in Figure 2, system rejection to disturbance ability is promoted greatly.
For a person skilled in the art, according to technical scheme described above and design, other various corresponding change and distortion can be made, and all these change and distortion all should belong within the protection range of the utility model claim.
Claims (2)
1. the anti-jamming circuit of a high frequency switch power, it is characterized in that, comprise high frequency switch power, wireless radio reception amplifying circuit and the storage battery for filtering, described high frequency switch power positive pole connects the positive pole of storage battery and the positive voltage input of radio reception amplifying circuit; High frequency switch power negative pole connects the negative pole of storage battery and the negative voltage input of radio reception amplifying circuit.
2. anti-jamming circuit as claimed in claim 1, it is characterized in that, described storage battery is lead acid accumulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520448971.2U CN204810142U (en) | 2015-06-26 | 2015-06-26 | High frequency switching power supply's anti -jamming circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520448971.2U CN204810142U (en) | 2015-06-26 | 2015-06-26 | High frequency switching power supply's anti -jamming circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204810142U true CN204810142U (en) | 2015-11-25 |
Family
ID=54594893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520448971.2U Expired - Fee Related CN204810142U (en) | 2015-06-26 | 2015-06-26 | High frequency switching power supply's anti -jamming circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204810142U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106981974A (en) * | 2017-04-05 | 2017-07-25 | 延锋伟世通电子科技（上海）有限公司 | A kind of vehicle power interface circuit for suppressing engine noise |
-
2015
- 2015-06-26 CN CN201520448971.2U patent/CN204810142U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106981974A (en) * | 2017-04-05 | 2017-07-25 | 延锋伟世通电子科技（上海）有限公司 | A kind of vehicle power interface circuit for suppressing engine noise |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151125 Termination date: 20180626 |