CN211701840U - Power supply circuit for reducing noise of motor vehicle detection system - Google Patents
Power supply circuit for reducing noise of motor vehicle detection system Download PDFInfo
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- CN211701840U CN211701840U CN202020252708.7U CN202020252708U CN211701840U CN 211701840 U CN211701840 U CN 211701840U CN 202020252708 U CN202020252708 U CN 202020252708U CN 211701840 U CN211701840 U CN 211701840U
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Abstract
The utility model discloses a supply circuit for reducing motor vehicle detecting system noise, the circuit passes through the cooperation of devices such as filter circuit, DC/DC converter, LDO stabiliser and uses, and the effectual other access equipment of avoiding cluster goes into automobile detection system interference, makes detecting system not influenced by the power supply noise.
Description
Technical Field
The utility model relates to a motor vehicle detection area, in particular to a power supply circuit for reducing motor vehicle detecting system noise.
Background
In recent years, the quantity of motor vehicles in China is increased sharply, the problem of safe operation of the motor vehicles is more and more prominent, the management of the motor vehicles is strengthened, the importance of safety technology detection of the motor vehicles is placed on the importance of the safety technology detection of the motor vehicles, the important problem to be researched and solved urgently becomes the whole society, particularly the public security traffic management department, and a good opportunity is provided for the development of the safety technology detection of the motor vehicles in China.
With the development of the automobile safety detection equipment market in China, the application and research and development of related core production technologies are bound to become the focus of attention of enterprises in the industry. Understanding the development trend, process equipment, technical application and trend of the production core technology of the domestic and foreign automobile safety detection equipment is very key for enterprises to improve the technical specification of products and the market competitiveness. Because the switching power supply has low cost, high conversion efficiency and small volume, most of the existing automobile detection equipment adopts the switching power supply technology, but the switching power supply has the defect of high noise and can influence the detection accuracy to a certain extent. Noise is a major factor affecting precision measurements.
Disclosure of Invention
An object of the utility model is to provide a supply circuit for reducing motor vehicle detecting system noise to the not enough of existence among the prior art.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a power supply circuit for reducing noise in a vehicle detection system, comprising: the circuit comprises an inductor L1, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor Cin, a capacitor Ce, a capacitor Cnr, a capacitor Cout, a resistor R1, a resistor Rb1, a resistor Rb2, a resistor Rnf, a DC/DC converter and an LDO voltage stabilizer, wherein the inductor L1, the capacitor C1, the capacitor C2, the capacitor C3, the capacitor Cin, the capacitor Ce, the capacitor Cnr, the capacitor Co; one end of the inductor L1 is connected with the positive pole of the switching power supply, and the other end of the inductor L1 is connected with the input end V + of the DC/DC converter; one end of the capacitor C1 is connected with the positive electrode of the switching power supply, and the other end of the capacitor C1 is connected with the negative electrode of the switching power supply; one end of the capacitor C2 is connected with the input end V + of the DC/DC converter, and the other end of the capacitor C2 is connected with the input end V-of the DC/DC converter; one end of the capacitor C3 is connected with the input end V + of the DC/DC converter, and the other end of the capacitor C3 is connected with the resistor R1; the other end of the resistor R1 is connected with the input end V-of the DC/DC converter; the capacitor C3 is connected with the resistor R1 in series and then is connected with the capacitor C2 in parallel; the output end V + of the DC/DC converter is connected with a pin Vin of the LDO voltage stabilizer, and the output end V-is connected with a bypass capacitor Cen of the LDO voltage stabilizer; one end of the capacitor Cin is connected with a pin Vin of the DC/DC converter, and the other end of the capacitor Cin is grounded; one end of the capacitor Ce is connected with a pin Cen of the LDO voltage stabilizer, and the other end of the capacitor Ce is grounded; a pin Vout of the LDO voltage stabilizer is connected with the detection system, and a pin Adj is connected with the resistor Rnf; one end of the resistor Rb1 is connected with the feedback end of the LDO voltage regulator, and the other end of the resistor Rb1 is connected with the resistor Rb2 in series; one end of the resistor Rb2 is connected with the feedback end of the LDO voltage regulator, and the other end of the resistor Rb2 is grounded; one end of the capacitor Cnr is connected with the detection system, and the other end of the capacitor Cnr is connected with the resistor Rnf; and the capacitor Cout is connected with the detection system in parallel.
The inductor L1 and the capacitor C2 form a preliminary filter circuit; the resistor R1 and the capacitor C3 form an oscillation preventing circuit, so that filtering resonance can be eliminated; the capacitor C1 adopts a large-capacity capacitor to form a reservoir capacitor, so that the circuit works stably; the capacitor Cin is a necessary base capacitor of the LDO voltage regulator, and can eliminate interference caused by overlong wiring; the capacitor Ce is used for filtering the reference voltage of the LDO voltage stabilizer, so that the internal interference of the LDO voltage stabilizer can be eliminated; the resistor Rb1 and the resistor Rb2 are voltage regulating networks; the resistor Rnf is used for filter phase margin compensation; the capacitor Cout can prevent the LDO voltage stabilizer from resonating; the capacitor Cnr may be voltage output high frequency filtered.
The inductor L1 and the capacitor C2 constitute a filter circuit, the cutoff frequency is 1/(2 pi × √ (L × C)), and in order to eliminate the filter circuit oscillation, an oscillation preventing circuit is constituted by the resistor R1 and the capacitor C3 to eliminate the filter resonance. Through the measures, the ripple and the noise of the switching power supply are suppressed to a certain extent. And then the power supply output voltage is objectively improved through internal conversion and isolation of the DC/DC converter, so that the noise of the output voltage is lower. In order to further reduce noise, the system adopts a low-noise LDO voltage stabilizer, and a reasonable high-frequency noise suppression circuit is formed by combining the capacitor Ce, the capacitor Cnr, the capacitor Cout, the resistor Rb1, the resistor Rb2 and the resistor Rnf to further reduce noise.
The utility model has the advantages that:
the utility model discloses the circuit can effectually avoid other access devices to go into the automobile detection system interference of cluster, makes detecting system not influenced by the power supply noise.
Drawings
Fig. 1 is a schematic diagram of the circuit of the present invention.
Detailed Description
The structure and operation of the present invention will be described in detail with reference to the following embodiments.
Examples
As shown, the circuit includes an inductor L1, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor Cin, a capacitor Ce, a capacitor Cnr, a capacitor Cout, a resistor R1, a resistor Rb1, a resistor Rb2, a resistor Rnf, a DC/DC converter, and an LDO regulator, which are connected to the positive electrode of the switching power supply; one end of the inductor L1 is connected with the positive pole of the switching power supply, and the other end of the inductor L1 is connected with the input end V + of the DC/DC converter; one end of the capacitor C1 is connected with the positive electrode of the switching power supply, and the other end of the capacitor C1 is connected with the negative electrode of the switching power supply; one end of the capacitor C2 is connected with the input end V + of the DC/DC converter, and the other end of the capacitor C2 is connected with the input end V-of the DC/DC converter; one end of the capacitor C3 is connected with the input end V + of the DC/DC converter, and the other end of the capacitor C3 is connected with the resistor R1; the other end of the resistor R1 is connected with the input end V-of the DC/DC converter; the capacitor C3 is connected with the resistor R1 in series and then is connected with the capacitor C2 in parallel; the output end V + of the DC/DC converter is connected with a pin Vin of the LDO voltage stabilizer, and the output end V-is connected with a bypass capacitor Cen of the LDO voltage stabilizer; one end of the capacitor Cin is connected with a pin Vin of the DC/DC converter, and the other end of the capacitor Cin is grounded; one end of the capacitor Ce is connected with a pin Cen of the LDO voltage stabilizer, and the other end of the capacitor Ce is grounded; a pin Vout of the LDO voltage stabilizer is connected with the detection system, and a pin Adj is connected with the resistor Rnf; one end of the resistor Rb1 is connected with the feedback end of the LDO voltage regulator, and the other end of the resistor Rb1 is connected with the resistor Rb2 in series; one end of the resistor Rb2 is connected with the feedback end of the LDO voltage regulator, and the other end of the resistor Rb2 is grounded; one end of the capacitor Cnr is connected with the detection system, and the other end of the capacitor Cnr is connected with the resistor Rnf; and the capacitor Cout is connected with the detection system in parallel.
The inductor L1 and the capacitor C2 constitute a preliminary filter circuit, the cutoff frequency is 1/(2 pi × √ (L × C)), and in order to eliminate oscillation of the preliminary filter circuit, an oscillation preventing circuit is constituted by the resistor R1 and the capacitor C3, and the filter resonance is eliminated. Through the measures, the ripple and the noise of the switching power supply are suppressed to a certain extent. And then the power supply output voltage is objectively improved through internal conversion and isolation of the DC/DC converter, so that the noise of the output voltage is lower. In order to further reduce noise, the system adopts a low-noise LDO voltage stabilizer, and a reasonable high-frequency noise suppression circuit is formed by combining the capacitor Ce, the capacitor Cnr, the capacitor Cout, the resistor Rb1, the resistor Rb2 and the resistor Rnf to further reduce noise.
Claims (1)
1. A power supply circuit for reducing noise in a vehicle detection system, comprising: the circuit comprises an inductor L1, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor Cin, a capacitor Ce, a capacitor Cnr, a capacitor Cout, a resistor R1, a resistor Rb1, a resistor Rb2, a resistor Rnf, a DC/DC converter and an LDO voltage stabilizer, wherein the inductor L1, the capacitor C1, the capacitor C2, the capacitor C3, the capacitor Cin, the capacitor Ce, the capacitor Cnr, the capacitor Co; one end of the inductor L1 is connected with the positive pole of the switching power supply, and the other end of the inductor L1 is connected with the input end V + of the DC/DC converter; one end of the capacitor C1 is connected with the positive electrode of the switching power supply, and the other end of the capacitor C1 is connected with the negative electrode of the switching power supply; one end of the capacitor C2 is connected with the input end V + of the DC/DC converter, and the other end of the capacitor C2 is connected with the input end V-of the DC/DC converter; one end of the capacitor C3 is connected with the input end V + of the DC/DC converter, and the other end of the capacitor C3 is connected with the resistor R1; the other end of the resistor R1 is connected with the input end V-of the DC/DC converter; the capacitor C3 is connected with the resistor R1 in series and then is connected with the capacitor C2 in parallel; the output end V + of the DC/DC converter is connected with a pin Vin of the LDO voltage stabilizer, and the output end V-is connected with a bypass capacitor Cen of the LDO voltage stabilizer; one end of the capacitor Cin is connected with a pin Vin of the DC/DC converter, and the other end of the capacitor Cin is grounded; one end of the capacitor Ce is connected with a pin Cen of the LDO voltage stabilizer, and the other end of the capacitor Ce is grounded; a pin Vout of the LDO voltage stabilizer is connected with the detection system, and a pin Adj is connected with the resistor Rnf; one end of the resistor Rb1 is connected with the feedback end of the LDO voltage regulator, and the other end of the resistor Rb1 is connected with the resistor Rb2 in series; one end of the resistor Rb2 is connected with the feedback end of the LDO voltage regulator, and the other end of the resistor Rb2 is grounded; one end of the capacitor Cnr is connected with the detection system, and the other end of the capacitor Cnr is connected with the resistor Rnf; and the capacitor Cout is connected with the detection system in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020252708.7U CN211701840U (en) | 2020-03-04 | 2020-03-04 | Power supply circuit for reducing noise of motor vehicle detection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020252708.7U CN211701840U (en) | 2020-03-04 | 2020-03-04 | Power supply circuit for reducing noise of motor vehicle detection system |
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| Publication Number | Publication Date |
|---|---|
| CN211701840U true CN211701840U (en) | 2020-10-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020252708.7U Expired - Fee Related CN211701840U (en) | 2020-03-04 | 2020-03-04 | Power supply circuit for reducing noise of motor vehicle detection system |
Country Status (1)
| Country | Link |
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| CN (1) | CN211701840U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111162667A (en) * | 2020-03-04 | 2020-05-15 | 广西车之家科技有限公司 | Power supply circuit for reducing noise of motor vehicle detection system |
| WO2022181606A1 (en) * | 2021-02-24 | 2022-09-01 | パナソニックＩｐマネジメント株式会社 | Filter circuit |
-
2020
- 2020-03-04 CN CN202020252708.7U patent/CN211701840U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111162667A (en) * | 2020-03-04 | 2020-05-15 | 广西车之家科技有限公司 | Power supply circuit for reducing noise of motor vehicle detection system |
| CN111162667B (en) * | 2020-03-04 | 2024-06-18 | 广西微车检智能科技有限公司 | Power supply circuit for reducing noise of motor vehicle detection system |
| WO2022181606A1 (en) * | 2021-02-24 | 2022-09-01 | パナソニックＩｐマネジメント株式会社 | Filter circuit |
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| GR01 | Patent grant | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201016 Termination date: 20210304 |
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| CF01 | Termination of patent right due to non-payment of annual fee |