CN203151376U - Voltage converting circuit and vehicle-mounted DVD navigator - Google Patents
Voltage converting circuit and vehicle-mounted DVD navigator Download PDFInfo
- Publication number
- CN203151376U CN203151376U CN 201320086462 CN201320086462U CN203151376U CN 203151376 U CN203151376 U CN 203151376U CN 201320086462 CN201320086462 CN 201320086462 CN 201320086462 U CN201320086462 U CN 201320086462U CN 203151376 U CN203151376 U CN 203151376U
- Authority
- CN
- China
- Prior art keywords
- voltage
- voltage conversion
- conversion circuit
- switching tube
- circuit
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The utility model is applied to the voltage converting circuit field, and especially relates to a voltage converting circuit and a vehicle-mounted DVD navigator. According to the utility model, the voltage converting circuit is composed of independent elements, detects the output voltage of a power supply circuit and controls the conduction/ cut-off of a switching tube, so that a power supply VCC1 and a shunting resistor R1 control a voltage needed and provided to a drive circuit, the voltage conversion is realized, especially the voltage conversion between a power supply voltage and a drive voltage is realized to provide the voltage needed by a load, and a load circuit and the drive circuit are protected effectively.
Description
Technical field
The utility model belongs to the voltage conversion circuit field, relates in particular to a kind of voltage conversion circuit and vehicle-carrying DVD omniselector.
Background technology
The vehicle-carrying DVD omniselector is that a kind of DVD of having plays, navigation feature is main on-vehicle host, and it generally is used for replacing the CD main frame of former car.If the special train special designs, its attaching plug, sound equipment line will with former car fully to inserting, do not change any circuit of former car, and outward appearance, size are unified with former car style.
At present, the supply voltage that various loads need is different, needs electric pressure converter that supply voltage is converted to voltage with the voltage matches that drives load, in order to avoid influence the operate as normal of load, even burn out load.
Equally, the difference in functionality circuit in the vehicle-carrying DVD omniselector also needs different driving voltages, and for example: the UART interface that has needs the driving voltage of 3.3V, and the UART interface that has needs the driving voltage of 5V; When on the UART bus that signal need be transformed into 5V from the UART bus of 3.3V, need carry out voltage transitions.
The utility model content
The purpose of this utility model is to provide a kind of voltage conversion circuit, is intended to solve the problem that the supply voltage that the power circuit of vehicle-carrying DVD omniselector is exported is converted to the required driving voltage of drive circuit.
The utility model is achieved in that a kind of voltage conversion circuit, and input VIN and the output VOUT of described voltage conversion circuit connect power circuit and drive circuit respectively, and described voltage conversion circuit comprises:
Shunt resistance R1, shunt resistance R2, switching tube, power supply VCC1 and power supply VCC2;
Described shunt resistance R1 is connected between the high voltage end of described power supply VCC1 and described switching tube, the output VOUT of the described voltage conversion circuit of high voltage termination of described switching tube, the input VIN of the described voltage conversion circuit of low-voltage termination of described switching tube, described shunt resistance R2 is connected between described control end of switching tube and the power supply VCC2.
Further, described voltage conversion circuit also comprises: shunt resistance R3;
Described shunt resistance R3 is connected between the input VIN of described power supply VCC2 and described voltage conversion circuit.
Further, described switching tube adopts NPN type triode Q1, the base stage of described NPN type triode Q1 is control end of switching tube, and the current collection of described NPN type triode Q1 is the hot end of switching tube very, and the emission of described NPN type triode Q1 is the cold end of switching tube very.
Further, described switching tube adopts N-type metal-oxide-semiconductor Q3, and the grid of described N-type metal-oxide-semiconductor Q3 is control end of switching tube, and the drain electrode of described N-type metal-oxide-semiconductor Q3 is the hot end of switching tube, and the source electrode of described N-type metal-oxide-semiconductor Q3 is the cold end of switching tube.
Further, described power circuit is a UART interface circuit, and described drive circuit is the 2nd UART interface circuit.
Another purpose of the utility model is to provide a kind of vehicle-carrying DVD omniselector, and described vehicle-carrying DVD omniselector comprises above-mentioned voltage conversion circuit.
In the utility model, described voltage conversion circuit all adopts free-standing components and parts to constitute, by the output voltage of voltage conversion circuit detection power circuit, the conduction and cut-off of control switch pipe, thereby by power supply VCC1 and shunt resistance R1, the required voltage that control provides drive circuit; Thereby the utility model has been realized voltage transitions, and especially the voltage transitions between supply voltage and the driving voltage provides required voltage to load, protects load circuit and drive circuit effectively.
Description of drawings
Fig. 1 is the circuit structure diagram of the voltage conversion circuit that provides of the utility model first embodiment;
Fig. 2 is the circuit structure diagram of the voltage conversion circuit that provides of the utility model second embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
Fig. 1 shows the structure of the voltage conversion circuit that the utility model first embodiment provides, and for convenience of explanation, only shows the part relevant with the utility model embodiment, and details are as follows.
Voltage conversion circuit, input VIN and the output VOUT of described voltage conversion circuit connect power circuit and drive circuit respectively, and described voltage conversion circuit comprises:
Shunt resistance R1, shunt resistance R2, switching tube 100, power supply VCC1 and power supply VCC2;
Described shunt resistance R1 is connected between the high voltage end of described power supply VCC1 and described switching tube 100, the output VOUT of the described voltage conversion circuit of high voltage termination of described switching tube 100, the input VIN of the described voltage conversion circuit of low-voltage termination of described switching tube 100, described shunt resistance R2 are connected between the control end and power supply VCC2 of described switching tube 100.
The voltage of described power supply VCC1 is determined by drive circuit required voltage and/or electric current.
In the present embodiment, the voltage of described power supply VCC1 is the drive circuit required voltage.
As the utility model one embodiment, described voltage conversion circuit also comprises: shunt resistance R3;
Described shunt resistance R3 is connected between the input VIN of described power supply VCC2 and described voltage conversion circuit.
The voltage of described power supply VCC2 is voltage to be converted.
Generally, the input VIN of voltage conversion circuit is the voltage of described power supply VCC2.
As the utility model one embodiment, described switching tube 100 adopts NPN type triode Q1, the base stage of described NPN type triode Q1 is the control end of switching tube 100, the current collection of described NPN type triode Q1 is the hot end of switching tube 100 very, and the emission of described NPN type triode Q1 is the cold end of switching tube 100 very.
Fig. 2 shows the structure of the voltage conversion circuit that the utility model second embodiment provides, and for convenience of explanation, only shows the part relevant with the utility model embodiment, and details are as follows.
As the utility model one embodiment, described switching tube 100 adopts N-type metal-oxide-semiconductor Q3, the grid of described N-type metal-oxide-semiconductor Q3 is the control end of switching tube 100, and the drain electrode of described N-type metal-oxide-semiconductor Q3 is the hot end of switching tube 100, and the source electrode of described N-type metal-oxide-semiconductor Q3 is the cold end of switching tube 100.
As the utility model one embodiment, described power circuit is a UART interface circuit, and described drive circuit is the 2nd UART interface circuit.
Preferably, a described UART interface circuit and the 2nd UART interface circuit include UART bus and UART interface.
The utility model also provides a kind of vehicle-carrying DVD omniselector, and described vehicle-carrying DVD omniselector comprises above-mentioned voltage conversion circuit.
Adopting NPN type triode Q1 with switching tube 100 below is example, the operation principle of account for voltage change-over circuit:
When the supply voltage with 3.3V was converted to the driving voltage of 5V, the voltage of power supply VCC1 was 5V, and the voltage of power supply VCC2 is 3.3V.When the input VIN of voltage conversion circuit is low level, the input VIN of voltage conversion circuit connects the emitter of NPN type triode Q1, power supply VCC2 connects the base stage of NPN type triode Q1 through shunt resistance R2, thereby, NPN type triode Q1 conducting, the output VOUT of voltage conversion circuit connects the collector electrode of NPN type triode Q1, the output VOUT output low level of voltage conversion circuit; When the input VIN of voltage conversion circuit imports the high level of 3.3V, the base stage of NPN type triode Q1 and the voltage between the emitter are 3.3V, thereby, NPN type triode Q1 ends, the output VOUT of voltage conversion circuit meets power supply VCC1 through shunt resistance R1, thereby, the output VOUT output 5V high level of voltage conversion circuit.More optimizedly, described power supply VCC2 is 3.3V voltage, if the voltage of input VIN that power circuit offers voltage conversion circuit is during a little less than 3.3V, power supply VCC2 draws high 3.3V through shunt resistance R3 with the voltage of the input VIN of voltage conversion circuit, thereby, the supply voltage that has guaranteed 3.3V has effectively also strengthened the driving force of voltage conversion circuit effectively to the power that converts to of the driving voltage of 5V.
In the time the supply voltage of 5V need being converted to the driving voltage of 3.3V, the voltage of power supply VCC1 is 3.3V, and the voltage of power supply VCC2 is 5V.When the input VIN of voltage conversion circuit is low level, the input VIN of voltage conversion circuit connects the emitter of NPN type triode Q1, power supply VCC2 connects the base stage of NPN type triode Q1 through shunt resistance R2, thereby, NPN type triode Q1 conducting, the output VOUT of voltage conversion circuit connects the collector electrode of NPN type triode Q1, the output VOUT output low level of voltage conversion circuit; When the input VIN of voltage conversion circuit imports the high level of 5V, the base stage of NPN type triode Q1 and the voltage between the emitter are 5V, thereby, NPN type triode Q1 ends, the output VOUT of voltage conversion circuit meets power supply VCC1 through shunt resistance R1, thereby, the output VOUT output 3.3V high level of voltage conversion circuit.More optimizedly, described power supply VCC2 is 5V voltage, if the voltage of input VIN that power circuit offers voltage conversion circuit is during a little less than 5V, power supply VCC2 draws high 5V through shunt resistance R3 with the voltage of the input VIN of voltage conversion circuit, thereby, the supply voltage that has guaranteed 5V has effectively also strengthened the driving force of voltage conversion circuit effectively to the power that converts to of the driving voltage of 3.3V.
In the utility model embodiment, described voltage conversion circuit all adopts free-standing components and parts to constitute, the change in voltage of the voltage conversion circuit input that detects by voltage conversion circuit, the conduction and cut-off of control switch pipe, thereby by power supply VCC1 and shunt resistance R1, control provides drive circuit required voltage to drive circuit.More preferably be, the voltage of power supply VCC2 is set to voltage to be converted, the voltage of input VIN that power circuit offers voltage conversion circuit is during a little less than voltage to be converted, power supply VCC2 draws high voltage to be converted through shunt resistance R3 with the voltage of the input VIN of voltage conversion circuit, thereby, guarantee supply voltage is converted to the power that converts to of driving voltage effectively, strengthened the driving force of voltage conversion circuit effectively.Thereby the utility model embodiment has realized voltage transitions, provides required voltage to load, protects load circuit and drive circuit effectively.
The above only is preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of within spirit of the present utility model and principle, doing, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (6)
1. voltage conversion circuit, input VIN and the output VOUT of described voltage conversion circuit connect power circuit and drive circuit respectively, it is characterized in that described voltage conversion circuit comprises:
Shunt resistance R1, shunt resistance R2, switching tube, power supply VCC1 and power supply VCC2;
Described shunt resistance R1 is connected between the high voltage end of described power supply VCC1 and described switching tube, the output VOUT of the described voltage conversion circuit of high voltage termination of described switching tube, the input VIN of the described voltage conversion circuit of low-voltage termination of described switching tube, described shunt resistance R2 is connected between described control end of switching tube and the power supply VCC2.
2. voltage conversion circuit as claimed in claim 1 is characterized in that, described voltage conversion circuit also comprises: shunt resistance R3;
Described shunt resistance R3 is connected between the input VIN of described power supply VCC2 and described voltage conversion circuit.
3. voltage conversion circuit as claimed in claim 1 or 2, it is characterized in that, described switching tube adopts NPN type triode Q1, the base stage of described NPN type triode Q1 is control end of switching tube, the current collection of described NPN type triode Q1 is the hot end of switching tube very, and the emission of described NPN type triode Q1 is the cold end of switching tube very.
4. voltage conversion circuit as claimed in claim 1 or 2, it is characterized in that, described switching tube adopts N-type metal-oxide-semiconductor Q3, the grid of described N-type metal-oxide-semiconductor Q3 is control end of switching tube, the drain electrode of described N-type metal-oxide-semiconductor Q3 is the hot end of switching tube, and the source electrode of described N-type metal-oxide-semiconductor Q3 is the cold end of switching tube.
5. voltage conversion circuit as claimed in claim 1 or 2 is characterized in that, described power circuit is a UART interface circuit, and described drive circuit is the 2nd UART interface circuit.
6. a vehicle-carrying DVD omniselector is characterized in that, described vehicle-carrying DVD omniselector comprises claim 1 or 2 described voltage conversion circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320086462 CN203151376U (en) | 2013-02-26 | 2013-02-26 | Voltage converting circuit and vehicle-mounted DVD navigator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320086462 CN203151376U (en) | 2013-02-26 | 2013-02-26 | Voltage converting circuit and vehicle-mounted DVD navigator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203151376U true CN203151376U (en) | 2013-08-21 |
Family
ID=48978868
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320086462 Expired - Fee Related CN203151376U (en) | 2013-02-26 | 2013-02-26 | Voltage converting circuit and vehicle-mounted DVD navigator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203151376U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104333238A (en) * | 2014-10-17 | 2015-02-04 | 重庆金宏汽车电子有限公司 | Power supply circuit for navigation device |
| CN108134518A (en) * | 2016-12-01 | 2018-06-08 | 深圳市三诺数字科技有限公司 | A kind of voltage conversion circuit |
| CN111556633A (en) * | 2020-05-26 | 2020-08-18 | 广州彩熠灯光股份有限公司 | Control circuit and lighting control system |
-
2013
- 2013-02-26 CN CN 201320086462 patent/CN203151376U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104333238A (en) * | 2014-10-17 | 2015-02-04 | 重庆金宏汽车电子有限公司 | Power supply circuit for navigation device |
| CN108134518A (en) * | 2016-12-01 | 2018-06-08 | 深圳市三诺数字科技有限公司 | A kind of voltage conversion circuit |
| CN111556633A (en) * | 2020-05-26 | 2020-08-18 | 广州彩熠灯光股份有限公司 | Control circuit and lighting control system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104698262A (en) | Zero cross detection circuit and variable frequency air conditioner | |
| CN203151376U (en) | Voltage converting circuit and vehicle-mounted DVD navigator | |
| CN203368304U (en) | Novel buck drive circuit | |
| CN203151377U (en) | Voltage converting circuit and vehicle-mounted DVD navigator | |
| CN203574367U (en) | Reverse connection protective circuit of power supply | |
| CN204190483U (en) | Power supply switch circuit | |
| CN203225733U (en) | A single-channel bidirectional logic level converter | |
| CN204556715U (en) | A kind of zero cross detection circuit and convertible frequency air-conditioner | |
| CN205862167U (en) | Low consumption circuit and the power-consumption control system waken up up based on automotive electronics rigid line | |
| CN205647293U (en) | Low pressure pulse power based on DSP control | |
| CN108134510A (en) | Igbt drive circuit | |
| CN103312155A (en) | Voltage regulator circuit and electronic device | |
| CN206099293U (en) | High voltage input protection circuit | |
| CN101192796A (en) | Voltage ascending power circuit | |
| CN101917184B (en) | Four-redundancy discrete signal integrated circuit | |
| CN106371491B (en) | High voltage generating circuit, method, power control circuit and electronic system | |
| CN204119204U (en) | A kind of bus logic level bi-directional conversion circuit | |
| CN205142166U (en) | Switch delay circuit and bluetooth speaker of bluetooth chip | |
| CN203261314U (en) | Modulator circuit based on NAND gate integrated circuit | |
| CN204236385U (en) | A kind of electrical energy distributor circuit for automobile | |
| CN204205950U (en) | high efficiency booster circuit | |
| CN202586291U (en) | Overload protection circuit | |
| CN203911150U (en) | Intelligent socket | |
| CN202957797U (en) | Grid electrode improved IGBT (Isolated Gate Bipolar Transistor) drive circuit | |
| CN202841094U (en) | Level conversion circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130821 Termination date: 20170226 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |