CN213402818U - Low-cost common mode inductance suppression direct current bias circuit - Google Patents
Low-cost common mode inductance suppression direct current bias circuit Download PDFInfo
- Publication number
- CN213402818U CN213402818U CN202022012595.6U CN202022012595U CN213402818U CN 213402818 U CN213402818 U CN 213402818U CN 202022012595 U CN202022012595 U CN 202022012595U CN 213402818 U CN213402818 U CN 213402818U
- Authority
- CN
- China
- Prior art keywords
- low
- common mode
- circuit
- voltage battery
- mode inductor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The utility model discloses a low-cost suppression common mode inductance direct current bias circuit, it includes high voltage battery, power conversion circuit, low voltage battery, control circuit and common mode inductance, high voltage of high voltage battery is converted into low voltage through power conversion circuit and is charged to low voltage battery, common mode inductance's input and low voltage battery's anodal electric connection, common mode inductance's output is just connecing behind the low tube voltage-drop diode and is connected with control circuit's power supply input electric connection, power conversion circuit's low pressure output is just connecing behind the high tube voltage-drop diode and is connected with control circuit's power supply input electric connection; the low-voltage battery, the control circuit and the common-mode inductor are grounded. The utility model discloses based on the current trend of changing common mode inductor in to the circuit, offset common mode inductor's direct current offset, make it keep enough high impedance to carry out effectual suppression and decay to EMI noise. The simple and low-cost diode circuit is added in the circuit, so that the electromagnetic compatibility of the product is obviously improved.
Description
Technical Field
The utility model relates to a new energy automobile power conversion technology field, especially a low-cost suppression common mode inductance direct current bias circuit.
Background
At present, a switching power supply is used in an automobile power converter, and in an EMC electromagnetic compatibility environment, noise generated by the switching power supply is not negligible and becomes one of a plurality of important EMI problems solved by many research and development engineers. The switching power supply generates a wide frequency range of common mode noise, and in order to effectively attenuate such noise, it is generally required to use a common mode inductor in the circuit, which has a sufficiently high impedance to effectively suppress and attenuate EMI noise. However, in practical applications, the current flowing through the common mode inductor has a dc bias, which causes saturation of the magnetic core, and thus the impedance of the common mode inductor is severely attenuated, resulting in degradation of electromagnetic compatibility.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to above-mentioned prior art not enough, provide a low-cost suppression common mode inductance direct current bias circuit.
In order to solve the technical problem, the utility model discloses the technical scheme who takes is: a low-cost DC bias circuit for suppressing a common mode inductor comprises a high-voltage battery, a power conversion circuit, a low-voltage battery, a control circuit and a common mode inductor, wherein the high voltage of the high-voltage battery is converted into low voltage through the power conversion circuit and charges the low-voltage battery, the input end of the common mode inductor is electrically connected with the anode of the low-voltage battery, the output end of the common mode inductor is electrically connected with the power supply input end of the control circuit after being connected with a low-tube voltage-drop diode, and the low-voltage output end of the power conversion circuit is electrically connected with the power supply input end of the control circuit after being connected with; the low-voltage battery, the control circuit and the common-mode inductor are grounded.
In the above technical solution, the control circuit includes a load.
In the technical scheme, the negative electrode of the low-voltage battery is connected with a ground loop impedance Rg in series.
In the above technical solution, the common mode inductor is grounded after being reversely connected with the diode.
The utility model has the advantages that: the circuit is a high-low voltage conversion module, and power supply of the high-voltage battery to the low-voltage battery is realized. The power supply circuit uses a common-mode inductor to reduce the EMI noise of the circuit to the low-voltage side. Based on changing the current trend of a common mode inductor in the circuit, the direct current bias of the common mode inductor is counteracted, so that the common mode inductor keeps high enough impedance to effectively suppress and attenuate EMI noise. The simple and low-cost diode circuit is added in the circuit, so that the electromagnetic compatibility of the product is obviously improved.
Drawings
Fig. 1 is a schematic diagram of the circuit principle of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, a low-cost dc bias circuit for suppressing common mode inductance includes a high-voltage battery, a power conversion circuit, a low-voltage battery, a control circuit, and a common mode inductance, where a high voltage of the high-voltage battery is converted into a low voltage by the power conversion circuit and charges the low-voltage battery, an input end of the common mode inductance is electrically connected to an anode of the low-voltage battery, an output end of the common mode inductance is electrically connected to a power supply input end of the control circuit after being connected to a low-voltage tube drop diode, and a low-voltage output end of the power conversion circuit is electrically connected to a power supply input end of the control circuit after being; the low-voltage battery, the control circuit and the common-mode inductor are grounded. The control circuit includes a load. And the negative electrode of the low-voltage battery is connected with a ground loop impedance Rg in series. The common mode inductor is connected with the diode in an inverse mode and then grounded.
The utility model discloses a theory of operation: because the control circuit and the low-voltage battery are in common, part of loop current (IG _ 1) does not flow back to the common-mode inductor, the current flowing through the common-mode inductor is IP + and IG _2, and the current IG _1 does not flow back to the low-voltage battery through the common-mode inductor, so that bias current exists on the common-mode inductor, and the bias current Id = IP + -IG _2= IG _ 1. The dc bias causes the common mode inductor impedance to drop and fail. In order to eliminate the dc bias of the common mode inductor, the added diode D1 is a high tube voltage drop diode (e.g. a common silicon diode), and D2 is a low tube voltage drop diode (e.g. a schottky diode), after the circuit is started to operate normally, the consumption current of the control circuit flows through D1 without passing through D2, the current IP + = IG _1=0 flowing through the common mode inductor, and the common mode inductor does not fail due to the bias current. Because high low voltage conversion module Is great to low-voltage side supply current Is, can produce the pressure differential when impedance flows through ground, ground return circuit impedance Is Rg, and the supply current Is, and the pressure drop of production Is V _ Rg = Is Rg. The voltage difference causes the common mode inductor loop to generate a current IG _1, when IP + =0 and the bias current Id = IG _1, and the dc bias also causes the common mode inductor impedance to drop and fail. The diode D3 is added, and because the diode D3 is reverse biased, the current IG _1=0 flows, the bias current flowing through the common mode inductor is zero, and the common mode inductor does not fail due to the bias current.
The above embodiments are merely illustrative and not restrictive, and all equivalent changes and modifications made by the methods described in the claims are intended to be included within the scope of the present invention.
Claims (4)
1. A low-cost common mode inductance rejection direct current bias circuit is characterized in that: the high-voltage battery charging circuit comprises a high-voltage battery, a power conversion circuit, a low-voltage battery, a control circuit and a common-mode inductor, wherein the high voltage of the high-voltage battery is converted into low voltage through the power conversion circuit and charges the low-voltage battery, the input end of the common-mode inductor is electrically connected with the anode of the low-voltage battery, the output end of the common-mode inductor is electrically connected with the power supply input end of the control circuit after being connected with a low-tube voltage-drop diode, and the low-voltage output end of the power conversion circuit is electrically connected with the power; the low-voltage battery, the control circuit and the common-mode inductor are grounded.
2. A low-cost common mode inductor rejection dc bias circuit as claimed in claim 1, wherein: the control circuit includes a load.
3. A low-cost common mode inductor rejection dc bias circuit as claimed in claim 1, wherein: and the negative electrode of the low-voltage battery is connected with a ground loop impedance Rg in series.
4. A low-cost common mode inductor rejection dc bias circuit as claimed in claim 1, wherein: the common mode inductor is connected with the diode in an inverse mode and then grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022012595.6U CN213402818U (en) | 2020-09-15 | 2020-09-15 | Low-cost common mode inductance suppression direct current bias circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022012595.6U CN213402818U (en) | 2020-09-15 | 2020-09-15 | Low-cost common mode inductance suppression direct current bias circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213402818U true CN213402818U (en) | 2021-06-08 |
Family
ID=76216958
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022012595.6U Active CN213402818U (en) | 2020-09-15 | 2020-09-15 | Low-cost common mode inductance suppression direct current bias circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213402818U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114184872A (en) * | 2021-12-27 | 2022-03-15 | 福州大学 | Device and method for measuring common-mode inductance broadband characteristic under direct current bias |
-
2020
- 2020-09-15 CN CN202022012595.6U patent/CN213402818U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114184872A (en) * | 2021-12-27 | 2022-03-15 | 福州大学 | Device and method for measuring common-mode inductance broadband characteristic under direct current bias |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102255489B (en) | High-voltage start-up circuit for switching power supply converter | |
| CN105958816B (en) | A kind of multiple-unit diode capacitance network and coupling inductance high-gain DC converter | |
| CN105471253A (en) | T-type coupling inductance network boost converter | |
| CN104702105A (en) | Boost converter for similar active switch inductance network | |
| CN103633839A (en) | Improved Z-source boosting DC (direct current)-DC converter | |
| CN107919797B (en) | Wide input range interleaving parallel connection type high-efficiency boost direct-current converter for fuel cell | |
| CN103701345A (en) | Five-level inverter | |
| CN103825457A (en) | Quasi-Z-source DC-DC boost converter circuit | |
| CN107623440A (en) | Voltage conversion circuit and power supply switch circuit | |
| CN213402818U (en) | Low-cost common mode inductance suppression direct current bias circuit | |
| CN102751866A (en) | High-gain DC (Direct Current)-DC boost converter applicable to photovoltaic generation system | |
| CN203883673U (en) | Improved Z-source boost DC-DC converter | |
| CN109698618B (en) | High-gain boost converter realized by coupling inductor boost unit and control method thereof | |
| CN103066841A (en) | Voltage-multiplying DC converter based on charge pump capacitor | |
| CN212412757U (en) | Electric potential absorption circuit | |
| CN111092548B (en) | High-gain Cuk direct-current converter with inductance-capacitance switch network | |
| CN104038049B (en) | The integrated current transformer of non-isolation type three port connection in series-parallel | |
| CN203722474U (en) | Quasi-Z-source DC-DC boost converter circuit | |
| CN105846674B (en) | Non-isolated high no-load voltage ratio two-way DC converter | |
| CN207368879U (en) | A kind of quasi- boost switching DC/DC converters of the high-gain of low voltage stress | |
| CN109672332A (en) | A kind of zero ripple DC-DC converter of single tube high-gain | |
| CN103701346B (en) | A kind of nine electrical level inverters | |
| CN105790576B (en) | A kind of isolated form CUK soft switch transducers | |
| CN109921674B (en) | Improved Cockcroft-Walton single-stage boosting inverter | |
| CN102710126B (en) | High-gain type step-up direct current converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |