CN106972746B - Device for restraining oscillation of power supply system of vehicle-mounted intelligent terminal - Google Patents
Device for restraining oscillation of power supply system of vehicle-mounted intelligent terminal Download PDFInfo
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- CN106972746B CN106972746B CN201610020925.1A CN201610020925A CN106972746B CN 106972746 B CN106972746 B CN 106972746B CN 201610020925 A CN201610020925 A CN 201610020925A CN 106972746 B CN106972746 B CN 106972746B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
- H02H11/002—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection
- H02H11/003—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection using a field effect transistor as protecting element in one of the supply lines
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a device for inhibiting the oscillation of a vehicle-mounted intelligent terminal power supply system, which comprises an anti-reverse connection and filter circuit, a DC-DC power supply conversion circuit, a voltage stabilizing circuit and a voltage doubling circuit, wherein the input end of the anti-reverse connection and filter circuit is connected with a vehicle-mounted storage battery power supply, the output end of the anti-reverse connection and filter circuit is connected with the first input end of the voltage stabilizing circuit, the second input end of the voltage stabilizing circuit is connected with the output end of the voltage doubling circuit, the output end of the voltage stabilizing circuit is respectively connected with the input end of the DC-DC power supply conversion circuit and the first input end of the voltage doubling circuit, and the output end of the DC-DC. The device has the advantages of simple hardware circuit implementation, low cost and high stability, and improves the anti-interference capability of the vehicle-mounted intelligent terminal power supply system.
Description
Technical Field
The invention relates to the field of anti-interference of a vehicle-mounted power supply, in particular to a device for inhibiting oscillation of a vehicle-mounted intelligent terminal power supply system.
Background
With the rapid development of modern industrial technologies, vehicle-mounted intelligent terminals such as vehicle-mounted navigation systems, vehicle-mounted video entertainment systems, vehicle-mounted anti-theft systems and the like are widely applied to the automobile industry. The electromagnetic environment inside the automobile is complex, and vehicle-mounted electrical equipment such as a high-voltage ignition system, an engine system and the like easily generate transient voltage interference of large energy in the running process, so that the high-frequency oscillation of a power supply system of the vehicle-mounted intelligent terminal is caused, and the normal work of the vehicle-mounted intelligent terminal is influenced.
Therefore, the method has important significance in restraining the oscillation of the vehicle-mounted intelligent terminal power supply system. In the prior art, a high-power transient suppression tube, a passive high-voltage resistance-capacitance device and the like are added to the front-end input of a vehicle-mounted intelligent terminal power supply system to form a low-impedance and high-capacity transient voltage suppressor, so that the stability of the vehicle-mounted intelligent terminal power supply system is maintained. However, the transient voltage suppressor is expensive and large in size, and increases the hardware cost of the vehicle-mounted intelligent terminal.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a device for inhibiting the oscillation of a vehicle-mounted intelligent terminal power supply system, has the characteristics of simple hardware circuit implementation, low cost and high stability, and improves the anti-interference capability of the vehicle-mounted intelligent terminal power supply system.
The technical scheme adopted by the invention for solving the technical problems is as follows:
an apparatus for suppressing oscillation of a power supply system of an in-vehicle smart terminal, comprising:
the reverse connection prevention and filter circuit is used for preventing the internal devices from being damaged by reverse connection of the polarity of the vehicle-mounted storage battery power supply and reducing the vehicle-mounted power supply ripple; the DC-DC power supply conversion circuit is used for converting a vehicle-mounted storage battery power supply into a low-voltage power supply; the voltage stabilizing circuit is used for stabilizing the input voltage of the DC-DC power supply conversion circuit; the voltage doubling circuit is used for ensuring the conductivity of the second MOS tube and reducing the voltage loss of the voltage stabilizing circuit; the input end of the reverse connection preventing and filtering circuit is connected with a vehicle-mounted storage battery power supply, the output end of the reverse connection preventing and filtering circuit is connected with the first input end of the voltage stabilizing circuit, the second input end of the voltage stabilizing circuit is connected with the output end of the voltage doubling circuit, the output end of the voltage stabilizing circuit is respectively connected with the input end of the DC-DC power supply conversion circuit and the first input end of the voltage doubling circuit, and the output end of the DC-DC power supply conversion circuit is connected with the second input end of the voltage doubling circuit.
The anti-reverse connection and filter circuit comprises a first MOS (metal oxide semiconductor) tube, a first voltage-regulator tube, a first resistor, a first inductor and a first capacitor, wherein the first inductor and the first capacitor are connected in series and then are connected between one end of the vehicle-mounted battery power supply and a source electrode of the first MOS tube, a drain electrode of the first MOS tube is connected with the other end of the vehicle-mounted battery power supply, an anode of the first voltage-regulator tube is connected with the source electrode of the first MOS tube, a cathode of the first voltage-regulator tube is connected with a grid electrode of the first MOS tube, one end of the first resistor is connected with the grid electrode of the first MOS tube, the other end of the first resistor is respectively connected with the DC-DC power supply conversion circuit and the voltage stabilizing circuit, and a node between the first inductor and the first capacitor is connected with the voltage.
The DC-DC power supply conversion circuit comprises a DC-DC converter, and the DC-DC converter is respectively connected with the reverse connection prevention and filter circuit, the voltage stabilizing circuit and the voltage doubling circuit.
The voltage stabilizing circuit comprises a second MOS tube, a second diode, a third voltage stabilizing tube and a second resistor; the second resistor, the second diode and the third voltage-regulator tube are connected in series and then connected between the drain electrode of the second MOS tube and the ground, the cathode of the second diode is connected with the cathode of the third voltage-regulator tube, a node between the second diode and the third voltage-regulator tube is connected with the grid electrode of the second MOS tube, a node between the drain electrode of the second MOS tube and the second resistor is connected with the reverse connection prevention and filter circuit, the source electrode of the second MOS tube is respectively connected with the reverse connection prevention and filter circuit and the DC-DC power supply conversion circuit, and the grid electrode of the second MOS tube is connected with the voltage doubling circuit.
The voltage doubling circuit comprises a third capacitor, a fifth diode and a fourth resistor; the fourth resistor, the fifth diode and the third capacitor are connected in series and then connected between the voltage stabilizing circuit and the DC-DC power conversion circuit, the anode of the fifth diode is connected with one end of the third capacitor, and the source of the second MOS tube is connected with the DC-DC power conversion circuit.
The voltage stabilizing circuit further comprises an RC filter circuit formed by connecting a third resistor and a second capacitor in series, and the RC filter circuit is connected with the third voltage stabilizing tube in parallel.
The voltage doubling circuit further comprises a fourth diode, the anode of the fourth diode is connected with the DC-DC power conversion circuit, and the cathode of the fourth diode is connected between the fifth diode and the third capacitor.
The DC-DC power conversion circuit further comprises an input filter circuit formed by connecting a fourth capacitor, a fifth capacitor and a sixth capacitor in parallel, and the input filter circuit is connected between the VIN end of the DC-DC converter and the ground.
The first MOS tube and the second MOS tube are N-type MOS tubes.
The technical scheme provided by the invention has the beneficial effects that: the vehicle-mounted intelligent terminal power supply system has the characteristics of simple hardware circuit implementation, low cost and high stability, and improves the anti-interference capability of the vehicle-mounted intelligent terminal power supply system.
The invention is described in further detail with reference to the drawings and the embodiments, but the device for suppressing the oscillation of the power supply system of the vehicle-mounted intelligent terminal is not limited to the embodiments.
Drawings
FIG. 1 is a block diagram of the apparatus of the present invention;
FIG. 2 is a schematic diagram of the circuit connection of the device of the present invention;
FIG. 3 is a waveform of the power input of the vehicle-mounted battery of the device of the present invention;
FIG. 4 shows the output waveform of the power supply of the device of the present invention.
Detailed Description
In an embodiment, please refer to fig. 1 and fig. 2, a device for suppressing oscillation of a power supply system of a vehicle-mounted intelligent terminal according to the present invention includes:
the reverse connection prevention and filter circuit 1 is used for preventing the reverse connection of the polarity of a vehicle-mounted storage battery power supply from damaging internal devices and reducing vehicle-mounted power supply ripples and comprises a first MOS (metal oxide semiconductor) tube Q1, a first voltage regulator tube D1, a first resistor R1, a first inductor L1 and a first capacitor C1;
the DC-DC power supply conversion circuit 3 is used for converting a vehicle-mounted storage battery power supply into a low-voltage power supply and comprises a DC-DC converter U1;
the voltage stabilizing circuit 2 for performing voltage stabilizing processing on the input voltage of the DC-DC power conversion circuit 3 comprises a second MOS transistor Q2, a second diode D2, a third voltage stabilizing transistor D3, and a second resistor R2;
the voltage doubling circuit 4 is used for ensuring the conductivity of the second MOS transistor Q2 and reducing the voltage loss of the voltage stabilizing circuit 2, and comprises a third capacitor C3, a fifth diode D5 and a fourth resistor R4;
the input end of the reverse connection preventing and filtering circuit 1 is connected with a vehicle-mounted storage battery power supply, the output end of the reverse connection preventing and filtering circuit is connected with the first input end of the voltage stabilizing circuit 2, the second input end of the voltage stabilizing circuit 2 is connected with the output end of the voltage doubling circuit 4, the output end of the voltage stabilizing circuit 2 is respectively connected with the input end of the DC-DC power supply conversion circuit 3 and the first input end of the voltage doubling circuit 4, and the output end of the DC-DC power supply conversion circuit 3 is connected with the second input end of the voltage doubling circuit 4.
The first inductor L1 and the first capacitor C1 are connected in series and then connected between one end of the vehicle-mounted battery power supply and the source of the first MOS transistor Q1, the drain of the first MOS transistor Q1 is connected with the other end of the vehicle-mounted battery power supply, the anode of the first voltage regulator D1 is connected with the source of the first MOS transistor Q1, the cathode is connected with the gate of the first MOS transistor Q1, the first resistor R1 is connected between the gate of the first MOS transistor Q1 and the VIN end of the DC-DC converter U1, the node between the drain of the second MOS transistor Q2 and the first inductor L1 is connected in series and then connected to the ground GND through the second resistor R2, the second diode D2 and the third voltage regulator D3, the cathode of the second diode D2 is connected with the cathode of the third voltage regulator D6866, the node between the second diode D2 and the third voltage regulator D3 is connected with the gate of the second MOS transistor Q73729, the fourth resistor R4, the fifth diode D5, and the third capacitor C3 are connected in series and then connected between the gate of the second MOS transistor Q2 and the SW terminal of the DC-DC converter U1, the anode of the fifth diode D5 is connected to one end of the third capacitor C3, and the source of the second MOS transistor Q2 is connected to the VIN terminal of the DC-DC converter U1.
Preferably, the voltage stabilizing circuit further comprises an RC filter circuit formed by connecting a third resistor and a second capacitor in series, and the RC filter circuit is connected in parallel with the third voltage regulator tube.
Preferably, the voltage-doubling circuit further includes a fourth diode, an anode of the fourth diode is connected to the VIN terminal of the DC-DC converter, and a cathode of the fourth diode is connected between the fifth diode and the third capacitor.
Preferably, the DC-DC power conversion circuit further includes an input filter circuit formed by connecting a fourth capacitor, a fifth capacitor and a sixth capacitor in parallel, and the input filter circuit is connected between the VIN terminal of the DC-DC converter and ground.
The first MOS tube and the second MOS tube are N-type MOS tubes.
The first capacitor and the sixth capacitor are electrolytic capacitors with polarities.
With reference to fig. 1 and fig. 2, the working process of the apparatus for suppressing oscillation of the power supply system of the vehicle-mounted intelligent terminal is specifically analyzed, wherein Vcar in fig. 2 represents the input of the power supply of the vehicle-mounted battery, Vcar _ GND represents the negative electrode of the power supply of the vehicle-mounted battery, and Vcar _ POW represents the input of the VIN terminal of the DC-DC converter, that is, the output power supply of the apparatus.
When the polarity of the vehicle-mounted battery power supply is positively connected with the polarity of the vehicle-mounted intelligent terminal power supply system, the resistor R1 provides voltage bias for the MOS transistor Q1, the voltage of the G end of the grid electrode of the MOS transistor Q1 is larger than the voltage of the S end of the source electrode, and the MOS transistor Q1 is in saturated conduction. When the polarity of the vehicle-mounted storage battery power supply is reversely connected with the polarity of the vehicle-mounted intelligent terminal power supply system, the MOS tube Q1 is in a disconnected state. The on-off of the switching characteristic control circuit of the MOS tube Q1 is utilized, and the damage to internal circuit devices of the vehicle-mounted intelligent terminal caused by reverse connection of a vehicle-mounted storage battery power supply is prevented. Preferably, D1 is a voltage regulator ZMM55C12, which prevents the voltage difference between the gate G and the source S of the MOS transistor Q1 from being too high to break down the MOS transistor Q1. And an inductor L1 and a large capacitor C1 with polarity are connected in series to form an LC filter circuit for reducing the ripple of the vehicle power supply.
The resistor R2 and the diode D2 provide initial voltage for the grid G end of the power MOS transistor Q2, the grid G end voltage of the MOS transistor Q2 is ensured to be larger than the voltage of the source S end, the Q2 is in a conducting state, and the diode D2 prevents the drain D of the power MOS transistor Q1 from being influenced by the voltage of the grid G. The SW end of the DC-DC converter U1 outputs a square wave of fixed 500KHz, the direct current voltage of the DC end of the DC-DC converter U3 is superposed with the direct current voltage of the source S end of the MOS tube Q2, and the square wave is rectified through the MOS tube D5 and the capacitor C2, so that the grid G end voltage of the MOS tube Q2 is twice of the source S end voltage, and the MOS tube Q2 is in saturated conduction. Preferably, D3 is a voltage regulator DL4753A with a voltage regulation value of 36V, so that the voltage difference of the grid source of the MOS transistor Q2 is prevented from being too high to break down the MOS transistor Q2, and the input end of the DC-DC converter U1 is ensured to be less than 36V.
When the automobile is in the processes of ignition or engine acceleration and deceleration and the like, the output end of the vehicle-mounted storage battery generates an instantaneous oscillation power supply with large energy impact. The LC filter circuit cannot completely eliminate the high-frequency oscillation voltage, and the high-frequency oscillation voltage exists at the D end of the drain of the MOS transistor Q2, and the high-frequency oscillation voltage exists at the gate G due to the inter-electrode coupling capacitance of the drain gate. Preferably, an RC filter network constructed by the resistor R3 and the capacitor C2 absorbs high-frequency oscillation at the gate G of the MOS transistor Q2, and ensures that the voltage at the gate G is a stable value, and since the input impedance between the gate G and the source S of the MOS transistor Q2 is large and the voltage drop is constant, the power supply output by the source S of the MOS transistor Q2 is a stable voltage, and the input terminal of the DC-DC power conversion module is a stable voltage.
Preferably, the diode D4 is used to prevent the SW terminal power of the DC-DC converter U1 from flowing backward to the VIN terminal of the DC-DC converter U1.
Fig. 3 is a waveform of a power input Vcar of a vehicle-mounted battery, and fig. 4 is a waveform of an output Vcar _ POW of a device for suppressing oscillation of a power system of a vehicle-mounted intelligent terminal.
The technical scheme provided by the invention has the beneficial effects that: the vehicle-mounted intelligent terminal power supply system has the characteristics of simple hardware circuit implementation, low cost and high stability, and improves the anti-interference capability of the vehicle-mounted intelligent terminal power supply system.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. A device for suppressing oscillation of a power supply system of an on-vehicle intelligent terminal is characterized by comprising:
the reverse connection prevention and filter circuit is used for preventing the internal devices from being damaged by reverse connection of the polarity of the vehicle-mounted storage battery power supply and reducing the vehicle-mounted power supply ripple; the DC-DC power supply conversion circuit is used for converting a vehicle-mounted storage battery power supply into a low-voltage power supply; the voltage stabilizing circuit is used for stabilizing the input voltage of the DC-DC power supply conversion circuit; the voltage doubling circuit is used for ensuring the conductivity of the second MOS tube and reducing the voltage loss of the voltage stabilizing circuit; the input end of the reverse connection preventing and filtering circuit is connected with a vehicle-mounted storage battery power supply, the output end of the reverse connection preventing and filtering circuit is connected with the first input end of the voltage stabilizing circuit, the second input end of the voltage stabilizing circuit is connected with the output end of the voltage doubling circuit, the output end of the voltage stabilizing circuit is respectively connected with the input end of the DC-DC power supply conversion circuit and the first input end of the voltage doubling circuit, and the output end of the DC-DC power supply conversion circuit is connected with the second input end of the voltage doubling circuit;
the voltage stabilizing circuit comprises a second MOS tube, a second diode, a third voltage stabilizing tube and a second resistor; the second resistor, the second diode and the third voltage-regulator tube are connected in series and then connected between the drain electrode of the second MOS tube and the ground, the cathode of the second diode is connected with the cathode of the third voltage-regulator tube, a node between the second diode and the third voltage-regulator tube is connected with the grid electrode of the second MOS tube, a node between the drain electrode of the second MOS tube and the second resistor is connected with the reverse connection prevention and filter circuit, the source electrode of the second MOS tube is respectively connected with the reverse connection prevention and filter circuit and the DC-DC power supply conversion circuit, and the grid electrode of the second MOS tube is connected with the voltage doubling circuit;
the voltage stabilizing circuit further comprises an RC filter circuit formed by connecting a third resistor and a second capacitor in series, and the RC filter circuit is connected with the third voltage stabilizing tube in parallel;
the anti-reverse connection and filter circuit comprises a first MOS (metal oxide semiconductor) tube, a first voltage-regulator tube, a first resistor, a first inductor and a first capacitor, wherein the first inductor and the first capacitor are connected in series and then are connected between one end of the vehicle-mounted battery power supply and a source electrode of the first MOS tube, a drain electrode of the first MOS tube is connected with the other end of the vehicle-mounted battery power supply, an anode of the first voltage-regulator tube is connected with the source electrode of the first MOS tube, a cathode of the first voltage-regulator tube is connected with a grid electrode of the first MOS tube, one end of the first resistor is connected with the grid electrode of the first MOS tube, the other end of the first resistor is respectively connected with the DC-DC power supply conversion circuit and the voltage stabilizing circuit, and a node between the first inductor and the first capacitor is connected with the voltage.
2. The device for suppressing oscillation of the power supply system of the vehicle-mounted intelligent terminal according to claim 1, characterized in that:
the DC-DC power supply conversion circuit comprises a DC-DC converter, and the DC-DC converter is respectively connected with the reverse connection prevention and filter circuit, the voltage stabilizing circuit and the voltage doubling circuit.
3. The device for suppressing oscillation of the power supply system of the vehicle-mounted intelligent terminal according to claim 1, characterized in that:
the voltage doubling circuit comprises a third capacitor, a fifth diode and a fourth resistor; the fourth resistor, the fifth diode and the third capacitor are connected in series and then connected between the voltage stabilizing circuit and the DC-DC power conversion circuit, the anode of the fifth diode is connected with one end of the third capacitor, and the source of the second MOS tube is connected with the DC-DC power conversion circuit.
4. The device for suppressing oscillation of a power supply system of a vehicle-mounted intelligent terminal according to claim 3, wherein:
the voltage doubling circuit further comprises a fourth diode, the anode of the fourth diode is connected with the DC-DC power conversion circuit, and the cathode of the fourth diode is connected between the fifth diode and the third capacitor.
5. The device for suppressing oscillation of the power supply system of the vehicle-mounted intelligent terminal according to claim 2, characterized in that:
the DC-DC power conversion circuit further comprises an input filter circuit formed by connecting a fourth capacitor, a fifth capacitor and a sixth capacitor in parallel, and the input filter circuit is connected between the VIN end of the DC-DC converter and the ground.
6. The device for suppressing oscillation of a power supply system of an in-vehicle intelligent terminal according to any one of claims 1 to 5, characterized in that:
the first MOS tube and the second MOS tube are N-type MOS tubes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610020925.1A CN106972746B (en) | 2016-01-13 | 2016-01-13 | Device for restraining oscillation of power supply system of vehicle-mounted intelligent terminal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610020925.1A CN106972746B (en) | 2016-01-13 | 2016-01-13 | Device for restraining oscillation of power supply system of vehicle-mounted intelligent terminal |
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| Publication Number | Publication Date |
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| CN106972746A CN106972746A (en) | 2017-07-21 |
| CN106972746B true CN106972746B (en) | 2020-06-26 |
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| CN201610020925.1A Active CN106972746B (en) | 2016-01-13 | 2016-01-13 | Device for restraining oscillation of power supply system of vehicle-mounted intelligent terminal |
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| CN113346749A (en) * | 2021-06-09 | 2021-09-03 | 湖南东嘉智能科技有限公司 | Power supply voltage stabilization integrating circuit |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2838140Y (en) * | 2005-08-25 | 2006-11-15 | 是蓉珠 | Vehicular DC-DC converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2838140Y (en) * | 2005-08-25 | 2006-11-15 | 是蓉珠 | Vehicular DC-DC converter |
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