CN211209305U - L C voltage reduction circuit with anti-surge function - Google Patents
L C voltage reduction circuit with anti-surge function Download PDFInfo
- Publication number
- CN211209305U CN211209305U CN201921053392.2U CN201921053392U CN211209305U CN 211209305 U CN211209305 U CN 211209305U CN 201921053392 U CN201921053392 U CN 201921053392U CN 211209305 U CN211209305 U CN 211209305U
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- Prior art keywords
- circuit
- constant current
- surge
- voltage reduction
- current source
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- Expired - Fee Related
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The utility model provides an L C step-down circuit with prevent surge function, prevent surge filter circuit, rectifier bridge and step-down circuit including the order connection, prevent surge filter circuit and be connected with power supply, including the filtering constant current source that can provide constant current for follow-up circuit, the filtering constant current source includes resistance capacitance C999, NTC and inductance L100 that the order is established ties, the utility model provides a pair of L C step-down circuit with prevent surge function avoids the potential safety hazard such as product shell burnout, PCB board carbonization that the higher harmonic that appears in the electric wire netting caused.
Description
Technical Field
The utility model belongs to the technical field of resistance-capacitance voltage reduction circuit, especially, L C voltage reduction circuit with anti-surge function
Background
In the small-sized household electrical appliance and lighting industry, in order to protect electrical components, a resistance-capacitance voltage reducing circuit (L C voltage reducing circuit) is needed to provide stable current for the electrical components, and generally comprises a high-probability cement resistor, a capacitor and a fixed value resistor to form a constant current source, so as to provide stable current for subsequent circuits.
SUMMERY OF THE UTILITY MODEL
The utility model discloses main aim at solves above-mentioned problem and not enough, provides an L C step-down circuit with anti-surge function, avoids the potential safety hazard that the higher harmonic that appears in the electric wire netting caused.
In order to achieve the above object, the utility model provides a pair of L C step-down circuit with prevent surge function, its technical scheme is:
the utility model provides an L C step-down circuit with prevent surge function, includes the anti-surge filter circuit, rectifier bridge and the step-down circuit of order connection, the anti-surge filter circuit is connected with power supply, includes the filtering constant current source that can provide the constant current for follow-up circuit, the filtering constant current source includes resistance capacitance C999, NTC and inductance L100 that the order is established ties.
Further, the filtering constant current source is communicated with the mains supply through a fuse F100.
Further, a voltage dependent resistor ZNR1 is connected in parallel between the filtering constant current source and the fuse F100.
Further, a safety capacitor C666 is connected between the filtering constant current source and the piezoresistor in parallel.
Further, the capacitance C999 is in the range of 0.47 mu F/400V to 1 mu F/400V.
Further, the inductor L100 is 2mh/300 mA.
Further, a resistor R200 is connected in parallel to the capacitor C999.
To sum up, the utility model provides a pair of L C step-down circuit with prevent surge function adopts electric capacity, and the higher impedance that the frequency is higher is big more, to NTC, the higher resistance that the temperature is higher is little less, inductance capacity fit NTC, usable inductance effective consumption higher harmonic, NTC further cooperates electric capacity, carries out secondary protection to whole circuit, prevents that the product shell that the circuit overheat leads from being burnt out and the problem that PCB board carbon is bad.
Description of the drawings:
FIG. 1 is a schematic diagram of an L C voltage reduction circuit with an anti-surge function;
the anti-surge filter circuit comprises an anti-surge filter circuit 1, a rectifier circuit 2, a voltage reduction circuit 3 and a filter constant current source 4.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The utility model provides an L C step-down circuit with prevent surge function, includes that the anti-surge filter circuit 1, rectifier bridge 2 and the step-down circuit 3 of connecting in proper order, and anti-surge filter circuit 1 is connected with power supply, including can providing the constant current's of follow-up circuit filtering constant current source 4, filtering constant current source 4 includes resistance R200, NTC and inductance L100 of establishing ties in proper order, resistance R200 river does not have electric capacity C999 to connect in parallel yet.
The utility model provides a pair of L C step-down circuit with prevent surge function, as shown in FIG. 1, including the anti-surge filter circuit 1, rectifier circuit 2 and the step-down circuit 3 of series connection in proper order, anti-surge filter circuit 1 is connected with power supply, and mains supply AC electricity like 50Hz 220V is connected, provides the stabilization current after the filtration for whole circuit, and the step-down circuit is connected with the power consumption part, further provides constant voltage power supply for the power consumption part.
The anti-surge filter circuit 1 comprises a filter constant current source 4, as shown in fig. 1, a current input end of the filter constant current source 4 is connected with a commercial power alternating current after being connected with a fuse F100 in series, a piezoresistor ZNR1 is connected between the fuse F100 and the filter constant current source 4 in parallel, the fuse F100 and the piezoresistor ZNR1 which are matched with each other provide safety protection for the whole circuit, when the whole circuit is overheated, the fuse F100 is fused, the whole circuit is powered off, the circuit is prevented from overheating, a product housing is burnt out or a PCB is carbonized, the filter constant current source 4 comprises a resistor R200, an NTC, an inductor L and an inductor C999, the resistor R200 is connected with the NTC and the inductor L in series in parallel after being connected with the inductor C999 in parallel, the filter constant current source 4 comprises a resistor R200, an NTC1 and an inductor L in series in sequence, the resistor R200 is electrically connected with the current output end in parallel, the resistor R200 is connected with a safety capacitor 666, the resistor C200 is higher in parallel, the larger impedance of the whole circuit is higher, the filter constant current output end of the piezoresistor ZNR1 and the resistor C100 is further used for verifying that the high-frequency of the commercial power filter constant current, the high-frequency capacitor C resistor C, the high-frequency capacitor is further used for verifying that the high-frequency capacitor, and the high-frequency capacitor is used for the high-frequency capacitor, and the high-frequency.
By electric capacity C999, resistance R200, NTC1, electric capacity 100 and the filtering constant current source 4 that ann rule electric capacity C666 constitutes, when getting rid of the higher harmonic with commercial power galvanic filtering, provide stable electric current to rectifier circuit 2 the utility model discloses in, rectifier circuit adopts rectifier bridge U200, and rectifier bridge U200's current output end is connected with step-down circuit 3. In the voltage reduction circuit 3, voltage stabilizing diodes D100 and D200 and aluminum electrolytic capacitors C100 and C200 connected in parallel are connected to a power supply chip U100 to supply constant voltage and current to the power supply chip U100. The rectifier bridge 200 and the voltage reduction circuit 3 may be of conventional circuit design and are not limited or required.
In practical application, the specifications and models of the capacitor C999, the resistor R200, the NTC1, the capacitor 100 and the safety capacitor C666 can be determined according to the current value to be provided, for example, in the present invention, the filtering constant current source 4 can provide a stable current of about 30-70mA to the rectifying circuit 2 and the voltage reduction circuit 3, wherein the NTC1 of the inductance coil can be selected as 50D-9, 30D-9 and 40D-9, the inductor L100 can be selected as 2mh/300mA, the above parameters can be adjusted according to the specific use situation, the R200 is selected in the range of 300K to 1M in resistance value, the capacitor C999 is a capacitor made of CBB material, and the specification is generally 0.47 muf/400V to 1 muf/400V.
To sum up, the utility model provides a pair of L C step-down circuit with prevent surge function adopts electric capacity, and the higher impedance that the frequency is higher is big more, to NTC, the higher resistance that the temperature is higher is little less, inductance capacity fit NTC, usable inductance effective consumption higher harmonic, NTC further cooperates electric capacity, carries out secondary protection to whole circuit, prevents that the product shell that the circuit overheat leads from being burnt out and the problem that PCB board carbon is bad.
Similar solutions can be derived as described above in connection with the given solution content. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical substance of the present invention are still within the scope of the technical solution of the present invention.
Claims (7)
1. An L C voltage reduction circuit with an anti-surge function comprises an anti-surge filter circuit, a rectifier bridge and a voltage reduction circuit which are sequentially connected, and is characterized in that the anti-surge filter circuit is connected with a power supply and comprises a filtering constant current source which can provide constant current for a subsequent circuit, and the filtering constant current source comprises a capacitor C999, an NTC and an inductor L100 which are sequentially connected in series.
2. The L C voltage reduction circuit with anti-surge function as claimed in claim 1, wherein the filtering constant current source is connected to the mains supply through a fuse F100.
3. The L C voltage reduction circuit with the surge protection function as claimed in claim 2, wherein a piezoresistor ZNR1 is connected in parallel between the filtering constant current source and the fuse F100.
4. The L C voltage reduction circuit with the anti-surge function is characterized in that a safety capacitor C666 is connected between the filtering constant current source and the voltage dependent resistor in parallel.
5. The L C voltage reduction circuit with the surge prevention function as claimed in claim 1, wherein the capacitor C999 has a specification in a range of 0.47 μ F/400V to 1 μ F/400V.
6. The L C voltage reduction circuit with the surge protection function of claim 1, wherein the inductor L100 is 2mh/300 mA.
7. The L C voltage reduction circuit with the surge protection function as claimed in claim 1, wherein a resistor R200 is connected in parallel to the capacitor C999.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921053392.2U CN211209305U (en) | 2019-07-02 | 2019-07-02 | L C voltage reduction circuit with anti-surge function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921053392.2U CN211209305U (en) | 2019-07-02 | 2019-07-02 | L C voltage reduction circuit with anti-surge function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211209305U true CN211209305U (en) | 2020-08-07 |
Family
ID=71850436
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921053392.2U Expired - Fee Related CN211209305U (en) | 2019-07-02 | 2019-07-02 | L C voltage reduction circuit with anti-surge function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211209305U (en) |
-
2019
- 2019-07-02 CN CN201921053392.2U patent/CN211209305U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| 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: 20200807 |