CN111181389A - Power supply voltage reduction circuit and corresponding control system - Google Patents
Power supply voltage reduction circuit and corresponding control system Download PDFInfo
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- CN111181389A CN111181389A CN202010102696.4A CN202010102696A CN111181389A CN 111181389 A CN111181389 A CN 111181389A CN 202010102696 A CN202010102696 A CN 202010102696A CN 111181389 A CN111181389 A CN 111181389A
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- power supply
- resistor
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- supply voltage
- voltage
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- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 4
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 4
- 239000004065 semiconductor Substances 0.000 claims abstract description 4
- 239000003990 capacitor Substances 0.000 claims description 4
- HEZMWWAKWCSUCB-PHDIDXHHSA-N (3R,4R)-3,4-dihydroxycyclohexa-1,5-diene-1-carboxylic acid Chemical compound O[C@@H]1C=CC(C(O)=O)=C[C@H]1O HEZMWWAKWCSUCB-PHDIDXHHSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Classifications
-
- 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
- H02M3/145—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 using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
-
- 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
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
-
- 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
- H02M1/0045—Converters combining the concepts of switch-mode regulation and linear regulation, e.g. linear pre-regulator to switching converter, linear and switching converter in parallel, same converter or same transistor operating either in linear or switching mode
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Continuous-Control Power Sources That Use Transistors (AREA)
Abstract
The invention relates to a power supply voltage-reducing circuit and a corresponding control system, wherein the power supply voltage-reducing circuit comprises an MOS (metal oxide semiconductor) tube, a first resistor and a second resistor; the first end of the first resistor and the first end of the MOS tube are connected with an external input voltage together; the second end of the first resistor is connected with the first end of the second resistor, and the second end of the second resistor is grounded; one end of the connection part of the first resistor and the second resistor is led out and connected with the control end of the MOS tube; and the second end of the MOS tube forms the output end of the power supply voltage reduction circuit. The power supply voltage reduction circuit and the corresponding control system adopting the structure have the characteristics of reliable performance and low cost, and can adjust the input voltage range according to the input range and the power consumption of the post-stage linear power supply circuit, thereby increasing the model selection flexibility of the post-stage linear power supply circuit.
Description
Technical Field
The invention relates to the field of circuit control, in particular to the technical field of automobile electronic control, and specifically relates to a power supply voltage reduction circuit and a corresponding control system.
Background
With the great development of the automobile industry in recent years, the functions of automobiles are more and more abundant, the whole automobile system is more and more complex, and the used electronic controllers are also gradually increased. Generally, an automobile controller includes a power circuit, an input circuit, an output circuit, a communication circuit, a main control chip and a minimum system thereof, wherein the power circuit is responsible for converting a 12V (or 24V) power provided by an automobile into a power (usually 5V) available for an MCU.
The power circuit is usually implemented by a DCDC (high-voltage (low-voltage) dc power supply is converted into a low-voltage (high-voltage) dc power supply) mode and a linear power supply mode, wherein the DCDC mode has high efficiency, but EMI (electromagnetic interference) interference is large, the rectification cost is high, and the price of the whole vehicle-scale DCDC scheme is high, so that the low-cost requirement is difficult to meet.
The linear power supply has the advantages of low noise, low cost and simple structure, can well adapt to the complex environment on the whole vehicle, and improves the reliability of the power supply under the condition of sacrificing a small part of efficiency, thereby being widely applied.
According to the operating principle of the linear power supply, when the input voltage is high, the power consumption is increased in proportion. In the use scene of using 24V to put in order car power supply such as commercial car, linear power source self consumption is great, and the temperature risees, can shorten the life of product to a certain extent. On the other hand, the linear power supply scheme sometimes cannot meet the input condition of the whole vehicle, and many mature schemes cannot be used due to mismatching conditions.
In summary, the power circuit in the prior art cannot consider the cost, the service life and the adaptability to the product.
Disclosure of Invention
The present invention is directed to overcome the above-mentioned drawbacks of the prior art, and to provide a power supply voltage reducing circuit and a control system thereof with low cost and good performance.
In order to achieve the above object, the power supply voltage reduction circuit and the corresponding control system of the present invention have the following configurations:
the power supply voltage reduction circuit is mainly characterized in that the power supply voltage reduction circuit comprises an MOS (metal oxide semiconductor) tube, a first resistor and a second resistor;
the first end of the first resistor and the first end of the MOS tube are connected with an external input voltage together;
the second end of the first resistor is connected with the first end of the second resistor, and the second end of the second resistor is grounded;
one end of the connection part of the first resistor and the second resistor is led out and connected with the control end of the MOS tube;
the second end of the MOS tube forms the output end of the power supply voltage reduction circuit and is used for outputting reduced voltage.
Preferably, the control end of the MOS transistor is grounded through a filter capacitor.
Preferably, the MOS transistor is formed by an NMOS transistor, a drain of the NMOS transistor forms a first end of the MOS transistor, and a source of the NMOS transistor forms a second end of the MOS transistor.
Preferably, the first resistor and the second resistor are selected according to the following formula 1:
wherein, VBATR1 is the resistance of the first resistor, R2 is the resistance of the second resistor, V is the voltage value of the external input voltageLDOFor desired step-down voltagePressure value, VGSThe conduction voltage drop between the grid electrode and the source electrode of the MOS tube is realized.
A control system comprising the above-mentioned power supply voltage-reducing circuit, its leading features, the said system also includes linear power supply circuit and load circuit;
the input end of the linear power supply circuit is connected with the output end of the power supply voltage reduction circuit, and the output end of the linear power supply circuit is connected with the load circuit.
By adopting the power supply voltage reduction circuit and the corresponding control system, as the related devices are composed of the separated components, the performance is reliable, the cost is low, the input voltage range can be adjusted according to the input range and the power consumption of the post-stage linear power supply circuit, and the flexibility of the type selection of the post-stage linear power supply circuit is improved.
Drawings
Fig. 1 is a circuit diagram of a power supply voltage reduction circuit applied to a control system according to an embodiment of the invention.
Fig. 2 is a system block diagram of the power supply voltage reducing circuit applied to the control system according to an embodiment of the invention.
Detailed Description
In order to more clearly describe the technical contents of the present invention, the following further description is given with reference to specific embodiments.
As shown in fig. 1 and 2, the power supply voltage reducing circuit of the present invention includes a MOS transistor Q1, a first resistor R1, and a second resistor R2;
a first end of the first resistor R1 and a first end of the MOS transistor Q1 are connected with an external input voltage in common;
the second end of the first resistor R1 is connected with the first end of the second resistor R2, and the second end of the second resistor R2 is grounded;
one end of the connection part of the first resistor R1 and the second resistor R2 is connected with the control end of the MOS transistor Q1;
the second end of the MOS transistor Q1 forms the output end of the power supply voltage reduction circuit and is used for outputting reduced voltage.
In this embodiment, the control terminal of the MOS transistor Q1 is grounded through a filter capacitor C1.
In this embodiment, the MOS transistor Q1 is composed of an NMOS transistor, a drain D of the NMOS transistor constitutes a first end of the MOS transistor, and a source S of the NMOS transistor constitutes a second end of the MOS transistor Q1.
In this embodiment, the first resistor R1 and the second resistor R2 can be selected according to the following formula 1:
wherein, VBATR1 is the resistance of the first resistor R1, R2 is the resistance of the second resistor R2, V is the voltage value of the external input voltageLDOAt a desired voltage value of the step-down voltage, VGSThe conduction voltage drop between the grid electrode and the source electrode of the MOS tube is realized.
That is, the parameters of the devices in the power supply voltage reduction circuit are selected according to the input conditions of the subsequent circuit, VLDOIt is actually the voltage to be input to the circuit at the later stage of the subsequent stage.
When the power supply voltage reduction circuit in the embodiment is applied to a control system, the system further comprises a linear power supply circuit and a load circuit;
the input end of the linear power supply circuit is connected with the output end of the power supply voltage reduction circuit, and the output end of the linear power supply circuit is connected with the load circuit.
When the control system is used in a system of a whole vehicle, a system power supply of the whole vehicle is input to a power supply voltage reduction circuit at a front stage, the input voltage is subjected to voltage reduction treatment by the power supply voltage reduction circuit so as to be matched with a circuit at a rear stage, and the voltage (namely the voltage reduction voltage) is treated by a linear power supply circuit at the rear stage, so that stable output voltage (5V) is provided and supplied to load circuits such as an MCU (microprogrammed control unit), a logic chip and the like in the system. In the embodiment, the low dropout linear regulator is adopted to form a linear power supply circuit.
When the power supply voltage reduction circuit and the corresponding control system are applied to a body controller of a light truck, the problem that in the prior art, the light truck adopts 24V whole truck power supply, the cost control is strict, the DCDC scheme is difficult to meet the requirement on cost, if the scheme of the linear power supply is used, the system input voltage condition is not matched with the linear power supply, and too much voltage is shared on the linear power supply can be effectively avoided.
In the embodiment, an NMOS (N-channel metal oxide semiconductor) tube is adopted to form a voltage reduction MOS tube Q1 of the circuit assembly, a resistor network formed by a first resistor R1 and a second resistor R2 is arranged at the same time, a drain D of the NMOS tube is connected with a power input end of a whole vehicle, a source S of the NMOS tube is connected with a post-stage linear power circuit, a first resistor R1 and a second resistor R2 are connected in series to form a voltage division resistor network, one end of the first resistor R1 after being connected in series is connected with a power supply, one end of the second resistor R2 is grounded, the connection part of the two resistors is connected to a grid electrode (control end) of the NMOS tube, and a filter capacitor C1 is arranged on the grid electrode of the NMOS tube to resist interference.
The power supply voltage reduction circuit and the corresponding control system in the embodiment have the following characteristics:
(1) the structure is simple, the core device is an MOS transistor Q1, and resistors R1 and R2 which are matched with set output values are all composed of separate components, so that the principle is simple, the performance is reliable, and the cost is low;
(2) the second, the practicality is strong, and it is through the resistance of the first resistance of adjustment selection and second resistance to can realize the effect of adjustment output voltage scope according to the input range and the consumption of back level linear power supply circuit, increased the flexibility ratio of selecting the type of back level linear power supply.
In this embodiment, the parameters of the devices in the power supply voltage reduction circuit are selected according to the input conditions of the subsequent circuit, VLDOIt is actually the voltage to be input to the circuit at the later stage of the subsequent stage. Assuming that the highest input voltage of the rear stage is to be setIs given as VLDOThe voltage value of the external input voltage is VBATThe conduction voltage drop between the grid G and the source S of the MOS tube is VGSThen the first resistor R1 and the second resistor R2 have the following relationship,
the voltage-reducing circuit output value V is set by setting the values of the first resistor R1 and the second resistor R2LDOThe size of the linear power supply circuit LDO can be set by referring to the rated power and the maximum input voltage of the linear power supply circuit LDO, the final value also refers to the temperature rise of an actual circuit, a reasonable proportion is used for dispersing heat, the model selection of the NMOS pipe Q1 also refers to the final power consumption, all device parameters are in the range allowed by a data manual, and certain margin is properly reserved on the selection of each parameter so as to improve the reliability of the system.
The power supply voltage reduction circuit and the corresponding control system can be applied to a commercial vehicle and other use scenes using 24V whole vehicle power supply, and solve the problems that the linear power supply has high power consumption and high temperature, and the linear power supply scheme can not meet the input conditions on the whole vehicle in the prior art.
By adopting the power supply voltage reduction circuit and the corresponding control system, as the related devices are composed of the separated components, the performance is reliable, the cost is low, the input voltage range can be adjusted according to the input range and the power consumption of the post-stage linear power supply circuit, and the flexibility of the type selection of the post-stage linear power supply circuit is improved.
In this specification, the invention has been described with reference to specific embodiments thereof. It will, however, be evident that various modifications and changes may be made thereto without departing from the broader spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.
Claims (5)
1. A power supply voltage reduction circuit is characterized by comprising an MOS (metal oxide semiconductor) tube, a first resistor and a second resistor;
the first end of the first resistor and the first end of the MOS tube are connected with an external input voltage together;
the second end of the first resistor is connected with the first end of the second resistor, and the second end of the second resistor is grounded;
one end of the connection part of the first resistor and the second resistor is led out and connected with the control end of the MOS tube;
the second end of the MOS tube forms the output end of the power supply voltage reduction circuit and is used for outputting reduced voltage.
2. The power supply voltage reducing circuit according to claim 1, wherein the control terminal of the MOS transistor is grounded through a filter capacitor.
3. The power supply voltage reducing circuit according to claim 1, wherein the MOS transistor is formed by an NMOS transistor, a drain of the NMOS transistor forms a first end of the MOS transistor, and a source of the NMOS transistor forms a second end of the MOS transistor.
4. The power supply voltage reducing circuit of claim 1, wherein the first resistor and the second resistor are selected according to the following equation 1:
wherein, VBATR1 is the resistance of the first resistor, R2 is the resistance of the second resistor, V is the voltage value of the external input voltageLDOAt a desired voltage value of the step-down voltage, VGSThe conduction voltage drop between the grid electrode and the source electrode of the MOS tube is realized.
5. A control system comprising the power supply voltage reduction circuit of any one of claims 1 to 4, wherein the system further comprises a linear power supply circuit and a load circuit;
the input end of the linear power supply circuit is connected with the output end of the power supply voltage reduction circuit, and the output end of the linear power supply circuit is connected with the load circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010102696.4A CN111181389A (en) | 2020-02-19 | 2020-02-19 | Power supply voltage reduction circuit and corresponding control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010102696.4A CN111181389A (en) | 2020-02-19 | 2020-02-19 | Power supply voltage reduction circuit and corresponding control system |
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| Publication Number | Publication Date |
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| CN111181389A true CN111181389A (en) | 2020-05-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010102696.4A Pending CN111181389A (en) | 2020-02-19 | 2020-02-19 | Power supply voltage reduction circuit and corresponding control system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111817561A (en) * | 2020-06-02 | 2020-10-23 | 东风柳州汽车有限公司 | Binary channels step-down circuit |
| CN113258649A (en) * | 2021-06-17 | 2021-08-13 | 山东爱德邦智能科技有限公司 | Power battery voltage reduction circuit and power supply system |
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| CN203219573U (en) * | 2013-04-12 | 2013-09-25 | 宁波普诚电子有限公司 | Large-power LED illuminating lamp power supply having delay protection function |
| CN203761284U (en) * | 2013-12-30 | 2014-08-06 | 四川新力光源股份有限公司 | Low-power step-down circuit |
| CN207053387U (en) * | 2017-06-23 | 2018-02-27 | 中国第一汽车股份有限公司 | The power module of automobile controller |
| CN108649663A (en) * | 2018-07-04 | 2018-10-12 | 深圳市道通智能航空技术有限公司 | Pressure limiting power supply circuit and electronic equipment |
| CN208053267U (en) * | 2018-04-13 | 2018-11-06 | 武汉科德斯汽车电子股份有限公司 | A kind of pre- reduction voltage circuit of vehicle electronic control unit power supply |
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2020
- 2020-02-19 CN CN202010102696.4A patent/CN111181389A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203219573U (en) * | 2013-04-12 | 2013-09-25 | 宁波普诚电子有限公司 | Large-power LED illuminating lamp power supply having delay protection function |
| CN203761284U (en) * | 2013-12-30 | 2014-08-06 | 四川新力光源股份有限公司 | Low-power step-down circuit |
| CN207053387U (en) * | 2017-06-23 | 2018-02-27 | 中国第一汽车股份有限公司 | The power module of automobile controller |
| CN208053267U (en) * | 2018-04-13 | 2018-11-06 | 武汉科德斯汽车电子股份有限公司 | A kind of pre- reduction voltage circuit of vehicle electronic control unit power supply |
| CN108649663A (en) * | 2018-07-04 | 2018-10-12 | 深圳市道通智能航空技术有限公司 | Pressure limiting power supply circuit and electronic equipment |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111817561A (en) * | 2020-06-02 | 2020-10-23 | 东风柳州汽车有限公司 | Binary channels step-down circuit |
| CN111817561B (en) * | 2020-06-02 | 2023-03-10 | 东风柳州汽车有限公司 | Two-channel voltage reduction circuit |
| CN113258649A (en) * | 2021-06-17 | 2021-08-13 | 山东爱德邦智能科技有限公司 | Power battery voltage reduction circuit and power supply system |
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Application publication date: 20200519 |
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