CN217769864U - Filter circuit applied to power supply - Google Patents
Filter circuit applied to power supply Download PDFInfo
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- CN217769864U CN217769864U CN202221780238.7U CN202221780238U CN217769864U CN 217769864 U CN217769864 U CN 217769864U CN 202221780238 U CN202221780238 U CN 202221780238U CN 217769864 U CN217769864 U CN 217769864U
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Abstract
The utility model relates to an use filter circuit on power, a serial communication port, include: the Y capacitor bank comprises a first Y capacitor CY1, a second Y capacitor CY2, a third Y capacitor CY3, a fourth Y capacitor CY4, a fifth Y capacitor CY5, a sixth Y capacitor CY6, a seventh Y capacitor CY7 and an eighth Y capacitor CY8, the X capacitor bank comprises a first X capacitor CX1 and a second X capacitor CX2, the first end of the first X capacitor CX1 is connected with the second end of the second Y capacitor CY2, and the electrolytic capacitor bank comprises a first electrolytic capacitor C1 and a second electrolytic capacitor C2. The filter circuit can realize common-mode interference suppression and differential-mode interference suppression aiming at disturbance signals when a rear-end switch circuit of a power supply generates electromagnetic interference through mutual matching of all components in the filter circuit.
Description
Technical Field
The utility model relates to a power supply unit field especially relates to a filtering circuit who uses on power.
Background
The power supply, as an energy supply device, is critical to ensure proper operation of the device. The existing power supply is usually provided with a filter circuit to filter an alternating current component in a power supply output voltage signal by using the filter circuit, so that a direct current component is reserved, and the stability of a final output voltage signal is ensured.
However, although the filter circuit of the conventional power supply has a certain filtering effect on the ac component of the power supply output voltage signal, it cannot suppress the electromagnetic interference generated by the back-end switch circuit of the power supply, resulting in poor electromagnetic compatibility (EMC) of the power supply.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a filtering circuit who uses on the power is provided to above-mentioned prior art. The filter circuit can effectively inhibit electromagnetic interference generated by a rear-end switch circuit of the power supply and improve the electromagnetic compatibility of the power supply.
The utility model provides a technical scheme that above-mentioned technical problem adopted does: a filter circuit for application to a power supply, comprising: the capacitor bank comprises a Y capacitor bank, an X capacitor bank, an electrolytic capacitor bank and a common mode inductor FL1; wherein:
the Y capacitor bank is provided with a first Y capacitor CY1, a second Y capacitor CY2, a third Y capacitor CY3, a fourth Y capacitor CY4, a fifth Y capacitor CY5, a sixth Y capacitor CY6, a seventh Y capacitor CY7 and an eighth Y capacitor CY8, the first end of each Y capacitor is connected with a grounding end MC, the second end of the first Y capacitor CY1 is connected with the second end of the second Y capacitor CY2 through a fuse F1, the second end of the second Y capacitor CY2 is connected with the second end of the third Y capacitor CY3 through a common-mode inductor FL1, and the second end of the eighth Y capacitor CY8 is connected with the second end of the seventh Y capacitor CY 7;
the X capacitor bank is provided with a first X capacitor CX1 and a second X capacitor CX2, the first end of the first X capacitor CX1 is connected with the second end of the second Y capacitor CY2, the second end of the first X capacitor CX1 is connected with the second end of the sixth Y capacitor CY6, the first end of the second X capacitor CX2 is connected with the second end of the third Y capacitor CY3, and the second end of the second X capacitor CX2 is connected with the second end of the seventh Y capacitor CY 7; a second end of the sixth Y capacitor CY6 is connected to a second end of the seventh Y capacitor CY7 through the common mode inductor FL1;
the electrolytic capacitor bank comprises a first electrolytic capacitor C1 and a second electrolytic capacitor C2, the first end of the first electrolytic capacitor C1 is connected with the second end of the fourth Y capacitor CY4, the second end of the first electrolytic capacitor C1 is connected with the second end of the eighth Y capacitor CY8, the first end of the second electrolytic capacitor C2 is respectively connected with the second end and VIN end of the fourth Y capacitor CY4, the second end of the second electrolytic capacitor C2 is connected with a ground terminal GND, and the ground terminal GND is connected with the second end of the eighth Y capacitor CY 8;
the second end of the second Y capacitor CY2 is connected to the second end of the sixth Y capacitor CY6 through a resistor R6, the second end of the third Y capacitor CY3 is connected to the anode of a diode CR1, and the second end of the fourth Y capacitor CY4 is connected to the cathode of the diode CR 1.
The utility model discloses in this utility model, the filter circuit who applies to on power still includes connector J1, and connector J1 has first contact, second contact and third contact, and the second end of first Y electric capacity CY1 is connected to this connector J1's first contact, and the second end of fifth Y electric capacity CY5 is connected to this connector J1's second contact, and the second end of fifth Y electric capacity CY5 is connected to this connector J1's third contact.
Further, in the filter circuit applied to the power supply, the parameters of the first electrolytic capacitor C1 and the second electrolytic capacitor C2 are both: the capacitance was 120UF, and the withstand voltage was 200V.
In the filter circuit applied to the power supply, the resistance value of the resistor R6 is 301K Ω.
In another improvement, in the filter circuit applied to the power supply, the fuse F1 has parameters: the rated current is 5A, and the rated voltage is 250V.
In a further improvement, in the filter circuit applied to the power supply, the diode CR1 has a model number MURB1660.
Compared with the prior art, the utility model has the advantages of: the utility model discloses a filter circuit is through setting up Y electric capacity group, X electric capacity group, electrolytic capacitor group, common mode inductance FL1 and connector J1 to make Y electric capacity group include a plurality of Y electric capacities and X electric capacity group including a plurality of X electric capacities, thereby through mutually supporting between each parts of this filter circuit inside, can be when the rear end switch circuit of power produces electromagnetic interference, realize common mode interference rejection and differential mode interference rejection to disturbing signal.
Drawings
Fig. 1 is a schematic diagram of a filter circuit applied to a power supply in an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
The present embodiment provides a filter circuit applied to a power supply. Referring to fig. 1, the filter circuit applied to the power supply of the embodiment includes a Y capacitor bank, an X capacitor bank, an electrolytic capacitor bank, a common mode inductor FL1, and a connector J1; wherein:
the Y capacitor bank is provided with a first Y capacitor CY1, a second Y capacitor CY2, a third Y capacitor CY3, a fourth Y capacitor CY4, a fifth Y capacitor CY5, a sixth Y capacitor CY6, a seventh Y capacitor CY7 and an eighth Y capacitor CY8, the first end of each Y capacitor is connected with a grounding end MC, the second end of the first Y capacitor CY1 is connected with the second end of the second Y capacitor CY2 through a fuse F1, the second end of the second Y capacitor CY2 is connected with the second end of the third Y capacitor CY3 through a common-mode inductor FL1, and the second end of the eighth Y capacitor CY8 is connected with the second end of the seventh Y capacitor CY 7; the parameters of the fuse F1 are: rated current is 5A, and rated voltage is 250V; the nominal capacitance of each Y capacitor is 2.2nF, and the rated voltage is 400V; the parameter of the common mode inductor FL1 is 2.2mH/3A;
the X capacitor group is provided with a first X capacitor CX1 and a second X capacitor CX2, the first end of the first X capacitor CX1 is connected with the second end of the second Y capacitor CY2, the second end of the first X capacitor CX1 is connected with the second end of the sixth Y capacitor CY6, the first end of the second X capacitor CX2 is connected with the second end of the third Y capacitor CY3, and the second end of the second X capacitor CX2 is connected with the second end of the seventh Y capacitor CY 7; a second end of the sixth Y capacitor CY6 is connected to a second end of the seventh Y capacitor CY7 through the common-mode inductor FL1; the parameters of each X capacitor are that the nominal capacitance is 220nF, and the rated voltage is 250V;
the electrolytic capacitor bank comprises a first electrolytic capacitor C1 and a second electrolytic capacitor C2, the first end of the first electrolytic capacitor C1 is connected with the second end of the fourth Y capacitor CY4, the second end of the first electrolytic capacitor C1 is connected with the second end of the eighth Y capacitor CY8, the first end of the second electrolytic capacitor C2 is respectively connected with the second end and VIN end of the fourth Y capacitor CY4, the second end of the second electrolytic capacitor C2 is connected with a ground terminal GND, and the ground terminal GND is connected with the second end of the eighth Y capacitor CY 8; wherein, the parameters of the first electrolytic capacitor C1 and the second electrolytic capacitor C2 are both: nominal capacitance of 120UF and rated voltage of 200V;
a second end of the second Y capacitor CY2 is connected to a second end of the sixth Y capacitor CY6 through a resistor R6, a second end of the third Y capacitor CY3 is connected to an anode of a diode CR1, and a second end of the fourth Y capacitor CY4 is connected to a cathode of the diode CR 1; the resistance value of the resistor R6 is 301K omega, and the model of the diode CR1 is MURB1660; the parameters of the diode CR1 are that the rated current is 16A, and the rated voltage is 600V;
the connector J1 has a first contact, a second contact and a third contact, the first contact of the connector J1 is connected to the second end of the first Y capacitor CY1, the second contact of the connector J1 is connected to the second end of the fifth Y capacitor CY5, and the third contact of the connector J1 is connected to the second end of the fifth Y capacitor CY 5. Wherein, the rated parameters of the connector J1 are: 20A/DB3.
The filtering operation principle of the filter circuit applied to the power supply of this embodiment is as follows:
1) Realizing the suppression of common mode interference
Requirements for common mode choke: a. the impedance is large under the initial magnetic conductivity of the material correspondingly under the frequency of an interference signal, and the impedance is small near the working frequency; b. the copper loss is small, and the inductance value has small temperature change; c. a good winding method is needed, so that the distributed capacitance is small.
When the back end switch circuit generates electromagnetic interference, the interference is suppressed through four stages of electromagnetic interference suppression;
primary electromagnetic interference suppression: the disturbance signal bypasses to a grounding end MC of the ground through a minimum current path through a fourth Y capacitor CY4 and an eighth Y capacitor CY 8;
secondary electromagnetic interference suppression: the disturbance signal bypasses to a grounding end MC of the ground through a minimum current path through a third Y capacitor CY3 and a seventh Y capacitor CY 7;
three-stage electromagnetic interference suppression: most of disturbance signals bypass to a grounding end MC of the ground through a minimum current path through a common-mode inductor FL1, a second Y capacitor CY2 and a sixth Y capacitor CY 6;
four-stage electromagnetic interference suppression: a small part of the disturbing signal is still left to be emitted through the PCB, the connector J1 and the external cable, and the first Y capacitor CY1 and the fifth Y capacitor CY5 are added near the connector J1 to bypass to the ground end MC of the ground through the minimum current path, and finally reach the relevant standard of electromagnetic compatibility (EMC).
2) Realizing the suppression of differential mode interference
The differential mode capacitor selects ceramic capacitor or polyethylene film capacitor with good filtering effect, and the embodiment adopts X capacitor. The interference is suppressed by the following two-stage electromagnetic interference suppression circuit:
primary electromagnetic interference suppression: the disturbance signal bypasses to the ground terminal GND through the second X capacitor CX2 via the minimum current path;
secondary electromagnetic interference suppression: most of the disturbing signals are bypassed to the ground terminal GND through the minimum current path through the first X capacitor CX1, and the resistor R6 is used for matching the loop of the disturbing signals, and finally, the relevant standard of electromagnetic compatibility (EMC) is achieved.
Although the preferred embodiments of the present invention have been described in detail hereinabove, it should be clearly understood that modifications and variations of the present invention are possible to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A filter circuit for application to a power supply, comprising: the capacitor bank comprises a Y capacitor bank, an X capacitor bank, an electrolytic capacitor bank and a common mode inductor FL1; wherein:
the Y capacitor bank is provided with a first Y capacitor CY1, a second Y capacitor CY2, a third Y capacitor CY3, a fourth Y capacitor CY4, a fifth Y capacitor CY5, a sixth Y capacitor CY6, a seventh Y capacitor CY7 and an eighth Y capacitor CY8, the first end of each Y capacitor is connected with a grounding end MC, the second end of the first Y capacitor CY1 is connected with the second end of the second Y capacitor CY2 through a fuse F1, the second end of the second Y capacitor CY2 is connected with the second end of the third Y capacitor CY3 through a common-mode inductor FL1, and the second end of the eighth Y capacitor CY8 is connected with the second end of the seventh Y capacitor CY 7;
the X capacitor bank is provided with a first X capacitor CX1 and a second X capacitor CX2, the first end of the first X capacitor CX1 is connected with the second end of the second Y capacitor CY2, the second end of the first X capacitor CX1 is connected with the second end of the sixth Y capacitor CY6, the first end of the second X capacitor CX2 is connected with the second end of the third Y capacitor CY3, and the second end of the second X capacitor CX2 is connected with the second end of the seventh Y capacitor CY 7; a second end of the sixth Y capacitor CY6 is connected to a second end of the seventh Y capacitor CY7 through the common mode inductor FL1;
the electrolytic capacitor bank comprises a first electrolytic capacitor C1 and a second electrolytic capacitor C2, the first end of the first electrolytic capacitor C1 is connected with the second end of the fourth Y capacitor CY4, the second end of the first electrolytic capacitor C1 is connected with the second end of the eighth Y capacitor CY8, the first end of the second electrolytic capacitor C2 is respectively connected with the second end and VIN end of the fourth Y capacitor CY4, the second end of the second electrolytic capacitor C2 is connected with a ground terminal GND, and the ground terminal GND is connected with the second end of the eighth Y capacitor CY 8;
the second end of the second Y capacitor CY2 is connected to the second end of the sixth Y capacitor CY6 through a resistor R6, the second end of the third Y capacitor CY3 is connected to the anode of a diode CR1, and the second end of the fourth Y capacitor CY4 is connected to the cathode of the diode CR 1.
2. The filter circuit applied to the power supply of claim 1, further comprising a connector J1, wherein the connector J1 has a first contact, a second contact and a third contact, the first contact of the connector J1 is connected to the second terminal of the first Y capacitor CY1, the second contact of the connector J1 is connected to the second terminal of the fifth Y capacitor CY5, and the third contact of the connector J1 is connected to the second terminal of the fifth Y capacitor CY 5.
3. The filter circuit applied to a power supply of claim 1, wherein the parameters of the first electrolytic capacitor C1 and the second electrolytic capacitor C2 are both: the capacitance was 120UF and the withstand voltage was 200V.
4. The filter circuit applied to a power supply of claim 1, wherein the resistance value of the resistor R6 is 301K Ω.
5. The filter circuit applied to a power supply of claim 1, wherein the fuse F1 has parameters of: the rated current is 5A, and the rated voltage is 250V.
6. The power supply filter circuit of claim 1, wherein the diode CR1 is of the type MURB1660.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221780238.7U CN217769864U (en) | 2022-07-05 | 2022-07-05 | Filter circuit applied to power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221780238.7U CN217769864U (en) | 2022-07-05 | 2022-07-05 | Filter circuit applied to power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217769864U true CN217769864U (en) | 2022-11-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221780238.7U Active CN217769864U (en) | 2022-07-05 | 2022-07-05 | Filter circuit applied to power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217769864U (en) |
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2022
- 2022-07-05 CN CN202221780238.7U patent/CN217769864U/en active Active
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