CN216252530U - Circuit for power supply anti-electromagnetic interference - Google Patents
Circuit for power supply anti-electromagnetic interference Download PDFInfo
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- CN216252530U CN216252530U CN202122801309.9U CN202122801309U CN216252530U CN 216252530 U CN216252530 U CN 216252530U CN 202122801309 U CN202122801309 U CN 202122801309U CN 216252530 U CN216252530 U CN 216252530U
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- piezoresistor
- mode inductance
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- 239000003990 capacitor Substances 0.000 claims abstract description 60
- 230000001681 protective effect Effects 0.000 claims abstract description 10
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- 238000002844 melting Methods 0.000 claims description 4
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 3
- 230000008018 melting Effects 0.000 claims description 3
- 230000036039 immunity Effects 0.000 claims 6
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 1
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Abstract
The utility model discloses a circuit for power supply anti-electromagnetic interference, which belongs to the technical field of electronics and comprises a protective tube Fu1, a piezoresistor MY1, a piezoresistor MY2, a piezoresistor MY3, a gas discharge tube DS1, a capacitor C2, a capacitor CY1, a capacitor CY2, a diode D1A, a diode D1, a common-mode inductance filter T1, an inductor L1 and a capacitor C4.
Description
Technical Field
The utility model belongs to the technical field of electronics, and particularly relates to a circuit for resisting electromagnetic interference of a power supply.
Background
The power equipment has complex operation environment and more peripheral interference factors, and the equipment is required to have certain anti-electromagnetic interference capability, but the anti-electromagnetic interference capability of the existing equipment is not strong, and the structure of the existing anti-electromagnetic interference circuit is complex and the element cost is high.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a circuit for resisting electromagnetic interference of a power supply, which solves the technical problem of resisting electromagnetic interference of the power supply of power equipment.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a circuit for power supply anti-electromagnetic interference comprises a protective tube Fu1, a piezoresistor MY1, a piezoresistor MY2, a piezoresistor MY3, a gas discharge tube DS1, a capacitor C2, a capacitor CY1, a capacitor CY2, a diode D1A, a diode D1, a common mode inductance filter T1, an inductor L1 and a capacitor C4, wherein one end of the protective tube Fu1 is connected with the positive pole of an external power supply, the other end of the protective tube outputs + PIN power supply, the negative pole of the external power supply outputs-PIN power supply, and 1 PIN of the common mode inductance filter T1 is connected with the + PIN power supply and 4 PINs are connected with-PIN power supply;
one end of a piezoresistor MY1 is connected with a pin 1 of a common-mode inductance filter T1, the other end of the piezoresistor MY1 is connected with a pin 4 of a common-mode inductance filter T1, the positive electrode of a gas discharge tube DS1 is connected with a pin 1 of a common-mode inductance filter T1 through a piezoresistor MY2, the positive electrode of a gas discharge tube DS1 is also connected with a pin 4 of the common-mode inductance filter T1 through a piezoresistor MY3, and the negative electrode of a gas discharge tube DS1 is connected with the ground PGND;
the positive electrode of the capacitor C2 is connected with the pin 1 of the common mode inductance filter T1, and the negative electrode of the capacitor C2 is connected with the pin 4 of the common mode inductance filter T1;
the pin 1 of the common mode inductance filter T1 is connected with the ground PGND through a capacitor CY 1;
a pin 2 of the common mode inductance filter T1 is connected with the ground PGND through a capacitor CY2, and a pin 3 outputs a ground wire GND;
the 2 feet of the common mode inductance filter T1 are respectively connected with the anode of the diode D1A and the anode of the diode D1, the cathode of the diode D1A and the cathode of the diode D1 are both connected with the 1 foot of the inductor L1, the 2 feet of the inductor L1 output a 24V positive power supply, and the capacitor C4 is a filter capacitor on the 2 feet of the inductor L1.
Preferably, the ground PGND is a ground connected to the ground, and the ground GND is a ground of the 24V positive power supply.
Preferably, the fuse Fu1 is a fuse of a lead-wire fast melting type.
Preferably, the piezoresistor MY1, the piezoresistor MY2 and the piezoresistor MY3 are all radial lead type piezoresistors.
Preferably, the capacitor C2 and the capacitor C4 are lead aluminum electrolytic capacitors.
Preferably, the capacitor CY1 and the capacitor CY2 are both a safety capacitor.
The circuit for resisting the electromagnetic interference of the power supply solves the technical problem of resisting the electromagnetic interference of the power supply of power equipment, has a simple circuit structure, low cost of adopted elements and good effect of resisting the electromagnetic interference, can well absorb the leakage of common-mode components to the ground, and has good effect of absorbing residual high-frequency signals.
Drawings
FIG. 1 is a circuit diagram of the present invention;
fig. 2 is a schematic block diagram of the present invention.
Detailed Description
The circuit for power supply anti-electromagnetic interference shown in fig. 1-2 comprises a protective tube Fu1, a piezoresistor MY1, a piezoresistor MY2, a piezoresistor MY3, a gas discharge tube DS1, a capacitor C2, a capacitor CY1, a capacitor CY2, a diode D1A, a diode D1, a common mode inductance filter T1, an inductor L1 and a capacitor C4, wherein one end of the protective tube Fu1 is connected with the positive electrode of an external power supply, the other end of the protective tube outputs + PIN power, the negative electrode of the external power supply outputs-PIN power, the PIN 1 of the common mode inductance filter T1 is connected with + PIN power, and the PIN 4 is connected with-PIN power;
in this embodiment, the fuse Fu1 constitutes an overload protection circuit, and the lead-fast-melting fuse Fu1 is connected in series to the positive electrode of the external power supply, and can be quickly cut off when the circuit is overloaded, thereby ensuring the safety of the whole power supply line and protecting the subsequent circuit.
One end of a piezoresistor MY1 is connected with a pin 1 of a common-mode inductance filter T1, the other end of the piezoresistor MY1 is connected with a pin 4 of a common-mode inductance filter T1, the positive electrode of a gas discharge tube DS1 is connected with a pin 1 of a common-mode inductance filter T1 through a piezoresistor MY2, the positive electrode of a gas discharge tube DS1 is also connected with a pin 4 of the common-mode inductance filter T1 through a piezoresistor MY3, and the negative electrode of a gas discharge tube DS1 is connected with the ground PGND;
the voltage clamping circuit is formed by the piezoresistor MY1, the piezoresistor MY2 and the piezoresistor MY3, the piezoresistor MY2 is connected with the two ends of the positive electrode and the negative electrode of an external power supply in parallel, the piezoresistor MY1 and the piezoresistor MY3 are connected in series and then connected with the two ends of the positive electrode and the negative electrode of the external power supply in parallel, the piezoresistor connected in parallel in the circuit can absorb instant high voltage brought by lightning surge, the circuit is protected, the continuous working voltage and the control voltage threshold value of the piezoresistor MY1 and the piezoresistor MY3 can be improved through the series connection, and the piezoresistor MY2 and the circuit are jointly protected.
The bleeder circuit is composed of an axial lead type gas discharge tube DS1, and the axial lead type gas discharge tube DS1 is connected in series with the piezoresistor MY1 and the piezoresistor MY3 which are connected in parallel and is connected to the external large ground PGND. The voltage rises suddenly when the lightning surge occurs, the impedance of the piezoresistor becomes low, the generated surge current needs to be discharged quickly, and the instantaneous overvoltage is clamped to protect the stability of a post-stage circuit.
The positive electrode of the capacitor C2 is connected with the pin 1 of the common mode inductance filter T1, and the negative electrode of the capacitor C2 is connected with the pin 4 of the common mode inductance filter T1;
the pin 1 of the common mode inductance filter T1 is connected with the ground PGND through a capacitor CY 1;
a pin 2 of the common mode inductance filter T1 is connected with the ground PGND through a capacitor CY2, and a pin 3 outputs a ground wire GND;
the common-mode inductor T1, the safety capacitor CY1 and the safety capacitor CY2 form a common-mode rejection circuit. The plug-in type common mode inductance filter T1 is connected in parallel to the positive electrode and the negative electrode of an external power supply, common mode and differential mode components of electromagnetic interference are restrained, and the safety capacitor CY1 and the safety capacitor CY2 are respectively connected in series between the pin 1 and the pin 2 of the common mode inductance T1 and the ground, and the common mode components are absorbed and released to the ground.
The 2 feet of the common mode inductance filter T1 are respectively connected with the anode of the diode D1A and the anode of the diode D1, the cathode of the diode D1A and the cathode of the diode D1 are both connected with the 1 foot of the inductor L1, the 2 feet of the inductor L1 output a 24V positive power supply, and the capacitor C4 is a filter capacitor on the 2 feet of the inductor L1.
The plug-in type normal diode D1, the plug-in type normal diode D1A, the chip inductor L1, the lead type aluminum electrolytic capacitor C2 and the lead type aluminum electrolytic capacitor C4 constitute the filter circuit of the present invention. The lead type aluminum electrolytic capacitor C2 is connected in parallel with the anode and the cathode of an external power supply to absorb high-frequency signals. The lead type aluminum electrolytic capacitor C4 is connected in parallel across the internal power supply (i.e., the power supply consisting of the 24V positive power supply and the ground GND) to absorb high frequency signals. The plug-in type common diodes D1 and D1A are connected in parallel and then are connected in series with the patch type inductor L1 at the positive pole of the internal power supply to absorb residual high-frequency signals.
Preferably, the ground PGND is a ground connected to the ground, and the ground GND is a ground of the 24V positive power supply.
Preferably, the fuse Fu1 is a fuse of a lead-wire fast melting type.
Preferably, the piezoresistor MY1, the piezoresistor MY2 and the piezoresistor MY3 are all radial lead type piezoresistors.
Preferably, the capacitor C2 and the capacitor C4 are lead aluminum electrolytic capacitors.
Preferably, the capacitor CY1 and the capacitor CY2 are both a safety capacitor.
The circuit for resisting the electromagnetic interference of the power supply solves the technical problem of resisting the electromagnetic interference of the power supply of power equipment, has a simple circuit structure, low cost of adopted elements and good effect of resisting the electromagnetic interference, can well absorb the leakage of common-mode components to the ground, and has good effect of absorbing residual high-frequency signals.
Claims (6)
1. A circuit for power supply immunity to electromagnetic interference, comprising: the circuit comprises a protective tube Fu1, a piezoresistor MY1, a piezoresistor MY2, a piezoresistor MY3, a gas discharge tube DS1, a capacitor C2, a capacitor CY1, a capacitor CY2, a diode D1A, a diode D1, a common mode inductance filter T1, an inductor L1 and a capacitor C4, wherein one end of the protective tube Fu1 is connected with the positive electrode of an external power supply, the other end of the protective tube outputs + PIN power supply, the negative electrode of the external power supply outputs-PIN power supply, a PIN 1 of the common mode inductance filter T1 is connected with the + PIN power supply, and a PIN 4 of the common mode inductance filter T1 is connected with-PIN power supply;
one end of a piezoresistor MY1 is connected with a pin 1 of a common-mode inductance filter T1, the other end of the piezoresistor MY1 is connected with a pin 4 of a common-mode inductance filter T1, the positive electrode of a gas discharge tube DS1 is connected with a pin 1 of a common-mode inductance filter T1 through a piezoresistor MY2, the positive electrode of a gas discharge tube DS1 is also connected with a pin 4 of the common-mode inductance filter T1 through a piezoresistor MY3, and the negative electrode of a gas discharge tube DS1 is connected with the ground PGND;
the positive electrode of the capacitor C2 is connected with the pin 1 of the common mode inductance filter T1, and the negative electrode of the capacitor C2 is connected with the pin 4 of the common mode inductance filter T1;
the pin 1 of the common mode inductance filter T1 is connected with the ground PGND through a capacitor CY 1;
a pin 2 of the common mode inductance filter T1 is connected with the ground PGND through a capacitor CY2, and a pin 3 outputs a ground wire GND;
the 2 feet of the common mode inductance filter T1 are respectively connected with the anode of the diode D1A and the anode of the diode D1, the cathode of the diode D1A and the cathode of the diode D1 are both connected with the 1 foot of the inductor L1, the 2 feet of the inductor L1 output a 24V positive power supply, and the capacitor C4 is a filter capacitor on the 2 feet of the inductor L1.
2. A circuit for power supply immunity to electromagnetic interference as recited in claim 1, wherein: the ground PGND is a ground line connected to the ground, and the ground line GND is a ground line of the 24V positive power supply.
3. A circuit for power supply immunity to electromagnetic interference as recited in claim 1, wherein: the fuse Fu1 is a lead-wire fast melting fuse.
4. A circuit for power supply immunity to electromagnetic interference as recited in claim 1, wherein: the piezoresistor MY1, the piezoresistor MY2 and the piezoresistor MY3 are all radial lead type piezoresistors.
5. A circuit for power supply immunity to electromagnetic interference as recited in claim 1, wherein: the capacitor C2 and the capacitor C4 are lead aluminum electrolytic capacitors.
6. A circuit for power supply immunity to electromagnetic interference as recited in claim 1, wherein: the capacitor CY1 and the capacitor CY2 are both safety capacitors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122801309.9U CN216252530U (en) | 2021-11-13 | 2021-11-13 | Circuit for power supply anti-electromagnetic interference |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122801309.9U CN216252530U (en) | 2021-11-13 | 2021-11-13 | Circuit for power supply anti-electromagnetic interference |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216252530U true CN216252530U (en) | 2022-04-08 |
Family
ID=80943577
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122801309.9U Active CN216252530U (en) | 2021-11-13 | 2021-11-13 | Circuit for power supply anti-electromagnetic interference |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216252530U (en) |
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2021
- 2021-11-13 CN CN202122801309.9U patent/CN216252530U/en active Active
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