CN202696992U - Car light controller - Google Patents
Car light controller Download PDFInfo
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- CN202696992U CN202696992U CN 201220381345 CN201220381345U CN202696992U CN 202696992 U CN202696992 U CN 202696992U CN 201220381345 CN201220381345 CN 201220381345 CN 201220381345 U CN201220381345 U CN 201220381345U CN 202696992 U CN202696992 U CN 202696992U
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- 239000000758 substrate Substances 0.000 claims description 3
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- 239000004065 semiconductor Substances 0.000 abstract description 2
- 230000003340 mental effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
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Abstract
The utility model provides a car light controller. The car light controller comprises a voltage conversion circuit, a microprocessor and a car light driving circuit, wherein the voltage conversion circuit comprises an operational amplifier, an NMOS (N-channel Mental Oxide Semiconductor) tube, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first PNP triode, a second PNP triode, a first capacitor and a second capacitor; and both the operational amplifier and the NMOS tube adopt high-voltage components. The car light controller, disclosed by the utility model, has a small number of circuit modules and components; and the whole circuit of the car light controller has the characteristics of low power consumption, a small area and a simple structure.
Description
Technical field
The utility model belongs to technical field of automotive electronics, relates in particular to a kind of car light controller.
Background technology
At present, because the supply voltage that automobile electronic system provides often is high value, therefore in the car light controller usually except comprising microprocessor and car light drive circuit, comprise that also the high voltage that voltage conversion circuit provides external power source carries out the low pressure conversion.And the internal components of general car light controller needs high-pressure process to avoid by the external power source high-voltage breakdown, but integrated to carry out signal when processing at the needs large-scale circuit, high tension apparatus does not but have application advantage because area occupied is large, device performance is relatively poor, but with the low pressure process device as paying the utmost attention to, therefore need a kind of car light controller, can produce the required built-in supply voltage of low-voltage device, when suitably designing, this magnitude of voltage also can be used as reference voltage source and provides voltage reference for car light controller simultaneously.
Traditional car light controller often adopts the LDO circuit structure, comprises reference voltage generating circuit, LDO circuit and external electric capacity of voltage regulation C1, and LDO feedback control loop dominant pole is arranged on the Vcc output, and inferior dominant pole is arranged on operational amplifier output terminal.Outside than high power supply voltage in order to resist, reference voltage generating circuit, LDO circuit need to design with high tension apparatus, so circuit scale, used area and power consumption are often larger, and the external electric capacity of voltage regulation C1 of chip has improved system cost.
Summary of the invention
In view of this, the utility model purpose is to provide a kind of car light controller, to solve the shortcoming that car light controller circuit scale of the prior art is large, power consumption is high and cost is large.
For achieving the above object, the utility model provides following technical scheme:
A kind of car light controller, comprise voltage conversion circuit, microprocessor and car light drive circuit, wherein voltage conversion circuit comprises: operational amplifier, NMOS pipe, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, a PNP triode, the 2nd PNP triode, the first electric capacity and the second electric capacity, wherein
The output of described operational amplifier respectively with the grid of described NMOS pipe be connected the first end of the second electric capacity and be connected the second end ground connection of described the second electric capacity;
The power end of described operational amplifier is connected drain electrode and is connected respectively outer power voltage VDDA, the ground end of described operational amplifier and the substrate ground connection of NMOS pipe with the NMOS pipe;
The source electrode of described NMOS pipe is connected with described the 4th resistance, the 5th resistance and the first end of electric capacity of being connected respectively, and as the output of described voltage conversion circuit, the second end ground connection of described the first electric capacity;
The positive input terminal of described operational amplifier is connected with the first end of the second end of described the 4th resistance, described the second resistance and the emitter of a described PNP triode respectively, the second end ground connection of described the second resistance, the base stage of a described PNP triode is connected and ground connection with self collector electrode;
The negative input end of described operational amplifier is connected with the first end of the second end of described the 5th resistance, described the first resistance and the first end of described the 3rd resistance respectively, the second end ground connection of described the 3rd resistance;
The second end of described the first resistance is connected with the emitter of described the 2nd PNP triode, and the base stage of described the 2nd PNP triode is connected and ground connection with self collector electrode.
Preferably, in above-mentioned car light controller, the dominant pole of described voltage conversion circuit is arranged on the output of described operational amplifier, and inferior dominant pole is arranged on the first end of described the first electric capacity.
Preferably, in above-mentioned car light controller, the dominant pole of described voltage conversion circuit is arranged on the first end of described the first electric capacity, and inferior dominant pole is arranged on the output of described operational amplifier, and the value of described the second electric capacity is set to zero.
Preferably, in above-mentioned car light controller, described the 2nd PNP triode is composed in parallel by N the parameter PNP triode identical with a described PNP triode, and wherein, N is natural number, and N 〉=2.
Preferably, in car light controller, described the 4th resistance equates with the resistance of the 5th resistance, and described the second resistance equates with the resistance of the 3rd resistance.
Preferably, in above-mentioned car light controller, described operational amplifier and NMOS pipe all adopt high tension apparatus.
The technical scheme that is provided by above the embodiment of the present application as seen, the whole circuit scale of car light controller of the present utility model is less, energy consumption is lower and simple in structure.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the overall structure schematic diagram of a kind of car light controller of the present utility model;
Fig. 2 is the electrical block diagram of voltage conversion circuit in a kind of car light controller of the present utility model.
Embodiment
For quote and know for the purpose of, writing a Chinese character in simplified form or abridging of hereinafter using is summarized as follows:
NMOS:N-Mental-Oxide-Semiconductor, Metal-oxide-semicondutor;
OPA:operational amplifier, operational amplifier.
Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all belong to the scope of the utility model protection.
As shown in Figure 1, car light controller of the present utility model comprises voltage conversion circuit 1, microprocessor 2 and car light drive circuit 3, and wherein voltage conversion circuit 1 is electrically connected with microprocessor 2, and car light drive circuit 3 is electrically connected with microprocessor 2.Voltage conversion circuit 1 is converted to low-voltage with external high voltage, and for microprocessor 2 provides the normal voltage value, microprocessor 2 is by to car light drive circuit 3 sending controling instructions, drives car light and carries out and turn to or other operations.Microprocessor 2 all adopts known solution with car light drive circuit 3, and those skilled in the art all know, do not repeat them here.
With reference to as shown in Figure 2, show the electrical block diagram of voltage conversion circuit in a kind of car light controller.As shown in Figure 2, voltage conversion circuit comprises: operational amplifier OPA, NMOS pipe NM1, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, a PNP triode Q1, the 2nd PNP triode Q2, the first capacitor C 1 and the second capacitor C 2.Wherein,
The output of OPA is connected first end with the grid of NM1 respectively and is connected the second end ground connection of C2 with C2; The power end of OPA is connected drain electrode and is connected respectively outer power voltage VDDA, the ground end of OPA and the substrate ground connection of NM1 with NM1; The source electrode of NM1 is connected first end with R4, R5 respectively and is connected with C1, and as the output VCC of described voltage conversion circuit, the second end ground connection of C1; The positive input terminal of OPA is connected with the second end of R4, the first end of R2 and the emitter of Q1 respectively, the second end ground connection of R2, and the base stage of Q1 is connected and ground connection with self collector electrode; The negative input end of OPA is connected with the second end of R5, the first end of R1 and the first end of R3 respectively, the second end ground connection of R3; The second end of R1 is connected with the emitter of Q2, and the base stage of Q2 is connected and ground connection with self collector electrode.
Further, because described OPA is connected with NM1 and is connected with outer power voltage VDDA, so OPA and NM1 all adopt high tension apparatus, be used for the opposing external high voltage, avoid device breakdown.C1 is as electric capacity of voltage regulation, and C2 is as building-out capacitor, and Q2 composes in parallel by N (N 〉=2, N belongs to natural number) PNP triode that parameter is identical with Q1 at least, and concrete number can be decided according to actual conditions, repeats no more herein.
The technical scheme that is provided by above the embodiment of the present application as seen, compare with circuit of the prior art, voltage conversion circuit in the car light controller of the present utility model need not external capacitor, and do not need all to adopt high tension apparatus, therefore whole circuit scale is less, so energy consumption is lower, and simple in structure.
Next elaborate the operation principle of the voltage conversion circuit in the utility model car light controller.
At first, resistance value is set to R4=R5, R2=R3.When circuit powers on normal operation, OPA controls the NM1 electric current by adjusting output voltage, OPA positive-negative input end voltage is approached to be equated, the first end of R4, R5 connects simultaneously, therefore the electric current that flows through resistance R 2, R3, R4, R5, triode Q1, Q2 has following relation: IR2=IR3, IR4=IR5, simultaneously IQ1=IQ2.Therefore the pressure drop on the R1 is dVbe=Vbe1-Vbe2=(KT/q) * ln (n), the electric current that flows through R1 is IR1=(KT/q) * ln (n)/R1, the electric current that flows through R3 is IR3=Vbe1/R3, therefore flow through electric current I R5=IR1+IR3=(KT/q) the * ln (n) of R5/R1+Vbe1/R3, so the magnitude of voltage expression formula of VCC is:
（(KT/q)*ln(n)/R1+Vbe1/R3）*R5+Vbel＝VCC (1)
Wherein, according to situation about using, VCC both can be used as internal power source voltage, also can be as the reference voltage of Circuits System.When VCC when the reference voltage, because demand motive ability not, so do not need very large the setting of the device breadth length ratio of NM1; When VCC when the internal power source voltage, then can the device breadth length ratio of NM1 arrange larger.
In a kind of execution mode of the present utility model, in order to reduce the voltage change ratio of VCC in temperature range, it is 0 that VCC voltage change ratio when normal temperature is varied with temperature, and at first, differentiate is to formula (1):
(K/q)*ln(n)*R5/R1+（Vbe1/T）*（R5/R3+1）=VCC/T︱T=27℃=0 (2)
Because Vbe1/T is about-1.5mV/K(according to technique is different can be different), (K/q) be about 0.087mV/K.Formula (1), formula (2) are formed equation group, VCC is set internal power source voltage value or reference voltage value, can solve the ratio of resistance R 1:R3:R5 by equation group, and require resistance R 1, R3, R5 resistance are arranged according to system power dissipation, thus, can reduce the voltage change ratio of VCC in temperature range.Car light controller of the present utility model, in-40 ℃-125 ℃ scope, the VCC value of voltage conversion circuit violent variation can not occur, and voltage change ratio has obtained reducing well.And no matter VCC is used as internal power source voltage or the reference voltage of Circuits System, its temperature is floated all less.
In a kind of execution mode of the present utility model, for the less situation of load circuit scale, the dominant pole of the voltage conversion circuit in the utility model can be arranged on the OPA output, C2 is building-out capacitor, and inferior dominant pole is arranged on the VCC place, and C1 is electric capacity of voltage regulation.And for the larger situation of load circuit, the dominant pole of voltage conversion circuit can be arranged on the VCC place, and C1 is the larger electric capacity of voltage regulation of capacitance, inferior dominant pole is arranged on the OPA output, and the capacitance of C2 is set to zero.
In sum, car light controller of the present utility model, circuit module and device scale are less, and voltage conversion circuit need not external capacitor and does not need all to adopt high tension apparatus, and therefore whole circuit scale has low-power consumption, low area, characteristics simple for structure.Because of VCC coincidence formula (2), by the resistance of resistance R 1, R3, R5 reasonably is set, can reduce the voltage change ratio of VCC in temperature range so in addition, temperature coefficient is lower.
Need to prove, above-described embodiment only is the application's preferred embodiment, does not cause the restriction to the application's open and protection range.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the utility model.Multiple modification to these embodiment will be apparent concerning those skilled in the art, and General Principle as defined herein can be in the situation that do not break away from spirit or scope of the present utility model, in other embodiments realization.Therefore, the utility model will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (6)
1. car light controller, comprise voltage conversion circuit, microprocessor and car light drive circuit, it is characterized in that, described voltage conversion circuit comprises: operational amplifier, NMOS pipe, the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, a PNP triode, the 2nd PNP triode, the first electric capacity and the second electric capacity, wherein
The output of described operational amplifier respectively with the grid of described NMOS pipe be connected the first end of the second electric capacity and be connected the second end ground connection of described the second electric capacity;
The power end of described operational amplifier be connected the drain electrode of NMOS pipe and connect respectively outer power voltage VDDA, the ground end of described operational amplifier and the substrate ground connection of described NMOS pipe;
The source electrode of described NMOS pipe is connected with described the 4th resistance, the 5th resistance and the first end of electric capacity of being connected respectively, and as the output of described voltage conversion circuit, the second end ground connection of described the first electric capacity;
The positive input terminal of described operational amplifier is connected with the first end of the second end of described the 4th resistance, described the second resistance and the emitter of a described PNP triode respectively, the second end ground connection of described the second resistance, the base stage of a described PNP triode is connected and ground connection with self collector electrode;
The negative input end of described operational amplifier is connected with the first end of the second end of described the 5th resistance, described the first resistance and the first end of described the 3rd resistance respectively, the second end ground connection of described the 3rd resistance;
The second end of described the first resistance is connected with the emitter of described the 2nd PNP triode, and the base stage of described the 2nd PNP triode is connected and ground connection with self collector electrode.
2. car light controller as claimed in claim 1 is characterized in that, the dominant pole of described voltage conversion circuit is arranged on the output of described operational amplifier, and inferior dominant pole is arranged on the first end of described the first electric capacity.
3. car light controller as claimed in claim 1 is characterized in that, the dominant pole of described voltage conversion circuit is arranged on the first end of described the first electric capacity, and inferior dominant pole is arranged on the output of described operational amplifier, and the value of described the second electric capacity is set to zero.
4. car light controller as claimed in claim 1 is characterized in that, described the 2nd PNP triode is composed in parallel by N the parameter PNP triode identical with a described PNP triode, and wherein, N is natural number, and N 〉=2.
5. car light controller as claimed in claim 1 is characterized in that, described the 4th resistance equates with the resistance of the 5th resistance, and described the second resistance equates with the resistance of the 3rd resistance.
6. car light controller as claimed in claim 1 is characterized in that, described operational amplifier and NMOS pipe all adopt high tension apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220381345 CN202696992U (en) | 2012-08-02 | 2012-08-02 | Car light controller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220381345 CN202696992U (en) | 2012-08-02 | 2012-08-02 | Car light controller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202696992U true CN202696992U (en) | 2013-01-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220381345 Expired - Lifetime CN202696992U (en) | 2012-08-02 | 2012-08-02 | Car light controller |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202696992U (en) |
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2012
- 2012-08-02 CN CN 201220381345 patent/CN202696992U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 4 / F, building 1, No.14 Jiuxianqiao Road, Chaoyang District, Beijing 100020 Patentee after: Beijing Jingwei Hirain Technologies Co.,Inc. Address before: 8 / F, Chuangye building, No. 11, Anxiang Beili, Chaoyang District, Beijing 100101 Patentee before: Beijing Jingwei HiRain Technologies Co.,Ltd. |
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| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130123 |