CN210075073U - Direct-current power supply filter without generating large starting current - Google Patents
Direct-current power supply filter without generating large starting current Download PDFInfo
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- CN210075073U CN210075073U CN201920929761.3U CN201920929761U CN210075073U CN 210075073 U CN210075073 U CN 210075073U CN 201920929761 U CN201920929761 U CN 201920929761U CN 210075073 U CN210075073 U CN 210075073U
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Abstract
The utility model discloses a do not produce big starting current's DC power supply wave filter, include: a differential mode and common mode filter network consisting of a capacitor and an inductor; a resistor is connected in series on a branch of one or more differential mode capacitors of the differential mode and common mode filter networks. The resistor connected in series with the differential mode capacitor can effectively reduce the large current generated at the moment of starting the circuit, so that the large instantaneous starting current is not generated at the moment of starting the circuit; compared with a common power supply filter, the starting current can be reduced to 1/5-1/10.
Description
Technical Field
The utility model belongs to the technical field of the condenser, a DC power supply filter is related to, concretely relates to do not produce large starting current's DC power supply filter.
Background
The power filter is an economic and reliable passive device for effectively inhibiting transmission of conducted electromagnetic interference, and comprises a differential mode filter network and a common mode filter network which are composed of capacitors and inductors; because the large-capacity differential mode capacitor exists between the positive bus and the negative bus, the capacitor is charged when the equipment is started, the circuit is in an instant short circuit state, the circuit generates huge starting impact current by applying voltage, and the calculation formula of the starting current is as follows:
wherein Ic represents the starting current generated by the circuit; c represents the capacitance of the capacitor; dv represents the voltage variation; dt represents the time variation (switching time).
According to the above formula, the larger the capacitance, the larger the starting current, without changing other conditions. The large starting current may damage other devices in the circuit, or may cause short-time interruption or damage to the power supply of the protection device, which may affect the normal operation of the device.
In order to ensure a high filtering effect, a differential mode capacitor with large capacity is required to be used between a positive bus and a negative bus of a general power supply filter, and meanwhile, the common power supply filter inevitably brings about the trouble of large starting current.
SUMMERY OF THE UTILITY MODEL
To the weak point that exists in the above-mentioned problem, the utility model provides a do not produce the DC power supply filter of big starting current.
The utility model discloses a do not produce big starting current's DC power supply wave filter, include: a differential mode and common mode filter network consisting of a capacitor and an inductor;
a resistor is connected in series on a branch of one or more differential mode capacitors of the differential mode and common mode filter networks.
As a further improvement of the present invention, the differential mode and common mode filter network comprises: the common-mode inductor L1, the differential-mode inductors L2 and L3 and the common-mode inductor L4 are sequentially arranged from the input end to the output end;
a differential mode capacitor C1 is arranged between the common mode inductor L1 and an input end, a differential mode capacitor C2 is arranged between the common mode inductor L1 and the differential mode inductors L2 and L3, a differential mode capacitor C3 is arranged between the differential mode inductors L2 and L3 and the common mode inductor L4, a differential mode capacitor C4 is arranged between the common mode inductor L4 and an output end, and common mode capacitors C5 and C6 are arranged between the differential mode capacitor C4 and the output end.
As a further improvement of the present invention, the common mode inductor L1 adopts a high μmagnetic core wound inductor.
As a further improvement of the present invention, a branch of the differential mode capacitor C2 is connected in series with a resistor R1, a branch of the differential mode capacitor C3 is connected in series with a resistor R2, and a branch of the differential mode capacitor C4 is connected in series with a resistor R3.
As a further improvement of the utility model, the resistance of the resistor is 0.1-20 omega.
Compared with the prior art, the beneficial effects of the utility model are that:
the direct current power supply filter can effectively inhibit conducted electromagnetic interference generated when a DC/DC power supply module in a circuit works, and the resistance connected in series on the differential mode capacitor can effectively reduce the large current generated at the moment of starting the circuit, so that the large instantaneous starting current is not generated at the moment of starting the circuit; compared with a common power supply filter, the starting current can be reduced to 1/5-1/10.
Drawings
Fig. 1 is a schematic circuit diagram of a dc power filter not generating a large starting current according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The utility model provides a do not produce big starting current's DC power supply wave filter, include: the circuit board comprises a capacitor, an inductor, a resistor, a circuit board and a shell, wherein the capacitor and the inductor form a differential mode and common mode filter network.
The key of the utility model is that a resistor is connected in series on one or more branches of differential mode capacitors of the differential mode and common mode filter network, and the large current generated in the moment of starting the circuit can be effectively reduced through the serially connected resistor, so that the large instantaneous starting current is not generated in the moment of starting the circuit; compared with a common power supply filter, the starting current can be reduced to 1/5-1/10.
The invention is described in further detail below with reference to the accompanying drawings:
as shown in fig. 1, the utility model provides a do not produce the dc power supply filter of big starting current, include: differential mode, common mode filter networks;
the utility model discloses a differential mode, common mode filter network include: the common-mode inductor L1, the differential-mode inductors L2 and L3 and the common-mode inductor L4 are sequentially arranged from the input end to the output end; a differential mode capacitor C1 is arranged between the common mode inductor L1 and an input end, a differential mode capacitor C2 is arranged between the common mode inductor L1 and the differential mode inductors L2 and L3, a differential mode capacitor C3 is arranged between the differential mode inductors L2 and L3 and the common mode inductor L4, a differential mode capacitor C4 is arranged between the common mode inductor L4 and an output end, and common mode capacitors C5 and C6 are arranged between the differential mode capacitor C4 and the output end. Wherein:
the differential mode capacitors C1, C2, C3 and C4 provide low impedance for differential mode noise signals, absorb noise and reduce interference;
common mode capacitors C5 and C6 suppress common mode noise and effectively reduce conducted electromagnetic interference;
the common-mode inductor L1 adopts a high-mu magnetic core to wind the inductor, so that a larger inductance value is obtained, and the transient current is relieved;
differential mode inductors L2 and L3 can effectively restrain spike current and conductive electromagnetic interference;
the common mode inductor L4 is a common mode choke coil, which can effectively suppress conducted electromagnetic interference.
The utility model is connected with a resistor R1 in series on the branch of a differential mode capacitor C2, a resistor R2 in series on the branch of a differential mode capacitor C3, and a resistor R3 in series on the branch of the differential mode capacitor C4; the resistors R1, R2 and R3 are used for absorbing impact current generated by the respective branches, and the resistance range of the resistor R (the resistors R1, R2 and R3) is as follows: 0.1-20 omega.
The utility model has the advantages that:
the utility model reduces the instant starting current generated by the filter by using a common mode inductor L1 with larger inductance at the input end and providing each branch circuit with series resistors R1, R2 and R3; meanwhile, the filter forms a matching network with inductors L2, L3 and L4 and capacitors C1, C2, C3, C4, C5 and C6, and has excellent filtering performance; simultaneously, compare with ordinary power filter, the utility model discloses a direct current power filter can reduce starting current to original 1/5 ~ 1/10.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur 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 (5)
1. A dc power filter that does not generate a large starting current, comprising: a differential mode and common mode filter network consisting of a capacitor and an inductor;
a resistor is connected in series on a branch of one or more differential mode capacitors of the differential mode and common mode filter networks.
2. The dc power filter of claim 1, wherein the differential mode, common mode filter network comprises: the common-mode inductor L1, the differential-mode inductors L2 and L3 and the common-mode inductor L4 are sequentially arranged from the input end to the output end;
a differential mode capacitor C1 is arranged between the common mode inductor L1 and an input end, a differential mode capacitor C2 is arranged between the common mode inductor L1 and the differential mode inductors L2 and L3, a differential mode capacitor C3 is arranged between the differential mode inductors L2 and L3 and the common mode inductor L4, a differential mode capacitor C4 is arranged between the common mode inductor L4 and an output end, and common mode capacitors C5 and C6 are arranged between the differential mode capacitor C4 and the output end.
3. The dc power filter of claim 2, wherein the common mode inductor L1 is a high μ core wound inductor.
4. The filter of claim 2, wherein a resistor R1 is connected in series to a branch of the differential mode capacitor C2, a resistor R2 is connected in series to a branch of the differential mode capacitor C3, and a resistor R3 is connected in series to a branch of the differential mode capacitor C4.
5. The direct-current power supply filter according to any one of claims 1 to 4, wherein the resistance value of the resistor is 0.1 Ω to 20 Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920929761.3U CN210075073U (en) | 2019-06-20 | 2019-06-20 | Direct-current power supply filter without generating large starting current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920929761.3U CN210075073U (en) | 2019-06-20 | 2019-06-20 | Direct-current power supply filter without generating large starting current |
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| Publication Number | Publication Date |
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| CN210075073U true CN210075073U (en) | 2020-02-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201920929761.3U Active CN210075073U (en) | 2019-06-20 | 2019-06-20 | Direct-current power supply filter without generating large starting current |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110212742A (en) * | 2019-06-20 | 2019-09-06 | 北京元六鸿远电子科技股份有限公司 | A kind of DC wave filter not generating great start-up current |
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2019
- 2019-06-20 CN CN201920929761.3U patent/CN210075073U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110212742A (en) * | 2019-06-20 | 2019-09-06 | 北京元六鸿远电子科技股份有限公司 | A kind of DC wave filter not generating great start-up current |
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