CN113436586A - PWM voltage control circuit and method - Google Patents
PWM voltage control circuit and method Download PDFInfo
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- CN113436586A CN113436586A CN202110890877.2A CN202110890877A CN113436586A CN 113436586 A CN113436586 A CN 113436586A CN 202110890877 A CN202110890877 A CN 202110890877A CN 113436586 A CN113436586 A CN 113436586A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
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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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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- Power Engineering (AREA)
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Abstract
The invention belongs to the field of linear dimming, and discloses a PWM voltage control circuit and a method, wherein the PWM voltage control circuit comprises the following steps: the power supply input end is used for inputting voltage signals set according to peripheral requirements; a PWM input terminal for inputting a PWM signal of a first voltage or a PWM signal of a second voltage; the transistor is connected with the power supply input end and the PWM input end and is used for being switched on when receiving the PWM signal of the first voltage or being switched off when receiving the PWM signal of the second voltage; the voltage output end is connected with the transistor and used for outputting a PWM signal of a third voltage when the transistor is conducted; wherein the first voltage is greater than the second voltage; the third voltage is greater than the first voltage. The invention can flexibly and more externally arrange the required voltage level, can be completed by replacing a proper circuit device, and is convenient and low in cost.
Description
Technical Field
The present invention relates to the field of linear dimming, and more particularly, to a PWM voltage control circuit and method.
Background
Some current device platform devices, the control pin of the IC, require the use of linearly varying levels for enabling adjustment. A regulating chip is usually added in the market, so that the cost is high, and a simple circuit is selected for lapping to complete the linear regulation of the backlight brightness.
The voltage provided by some platforms can not meet the requirement of the chip on the PWM voltage value, some linear regulation or PWM level boosting circuits in the market are realized by ICs at present, the cost is higher, and the voltage needing to be regulated up has a limit.
Disclosure of Invention
The present invention provides a PWM voltage control circuit and method, which solves the above problems.
The technical scheme provided by the invention is as follows:
in one aspect, a PWM voltage control circuit is provided, including:
the power supply input end is used for inputting voltage signals set according to peripheral requirements;
a PWM input terminal for inputting a PWM signal of a first voltage or a PWM signal of a second voltage;
the transistor is connected with the power supply input end and the PWM input end and is used for being switched on when receiving the PWM signal of the first voltage or being switched off when receiving the PWM signal of the second voltage;
the voltage output end is connected with the transistor and used for outputting a PWM signal of a third voltage when the transistor is conducted;
wherein the first voltage is greater than the second voltage; the third voltage is greater than the first voltage.
Further preferred, comprising:
and the voltage dividing resistor is connected with the power input end and is used for dividing the voltage of the voltage signal.
Further preferably, the method further comprises the following steps:
and the RC filter circuit is connected with the PWM input end and the transistor and is used for filtering noise waves.
Further preferably, the RC filter circuit includes: a filter resistor and a first capacitor;
the filter resistor is connected with the PWM input end and the transistor;
the first end of the first capacitor is connected with the filter resistor, and the second end of the first capacitor is grounded.
Further preferably, the method further comprises the following steps:
and the current limiting resistor is connected with the divider resistor, the transistor and the voltage output end and is used for limiting the current of the output signal of the voltage output end.
Further preferably, the method further comprises the following steps:
and the second capacitor is connected with the current-limiting resistor and the voltage output end and is used for forming an RC circuit with the current-limiting resistor so that the second capacitor is charged by the PWM signal output by the transistor, and the voltage output end outputs linear voltage.
Further preferably, a first terminal of the transistor is connected to the RC filter circuit, a second terminal of the transistor is grounded, and a third terminal of the transistor is connected to the power input terminal and the voltage output terminal.
A PWM voltage control method, comprising:
inputting a voltage signal set according to the peripheral requirement through a power supply input end;
inputting a PWM signal of a first voltage or a PWM signal of a second voltage by using a PWM input end;
the power supply is connected with the power supply input end and the PWM input end through a transistor, and is switched on when receiving the PWM signal of the first voltage, or is switched off when receiving the PWM signal of the second voltage;
a voltage output end is connected with the transistor, and when the transistor is conducted, a PWM signal of a third voltage is output;
wherein the first voltage is greater than the second voltage; the third voltage is greater than the first voltage.
Further preferably, the method further comprises the following steps:
the second capacitor is connected with the current-limiting resistor and the voltage output end, and forms an RC circuit with the current-limiting resistor, so that the second capacitor is charged by a PWM signal output by the transistor, and the voltage output end outputs linear voltage.
The PWM voltage control circuit and the method provided by the invention at least have the following technical effects:
the invention can flexibly and more externally arrange the required voltage level, can be completed by replacing a proper circuit device, and is convenient and low in cost.
Drawings
The invention is described in further detail below with reference to the following figures and detailed description:
FIG. 1 is a schematic diagram of one embodiment of a PWM voltage control circuit of the present invention;
FIG. 2 is a schematic diagram of another embodiment of a PWM voltage control circuit of the present invention;
FIG. 3 is a schematic diagram of one embodiment of a PWM voltage control method of the present invention;
FIG. 4 is a signal diagram of the normal operation of the present invention;
FIG. 5 is a waveform illustrating the normal operation of the present invention;
fig. 6 is a schematic diagram of an embodiment of a PWM voltage control method of the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
For the sake of simplicity, the drawings only schematically show the parts relevant to the present invention, and they do not represent the actual structure as a product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically illustrated or only labeled. In this document, "one" means not only "only one" but also a case of "more than one".
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
In this context, it is to be understood that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not intended to indicate or imply relative importance.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will be made with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.
Example one
In one aspect, as shown in fig. 1, the present invention provides a PWM voltage control circuit, including:
and the power supply input end 1 is used for inputting a voltage signal set according to the peripheral requirement.
And a PWM input terminal 2 for inputting a PWM signal of a first voltage or a PWM signal of a second voltage.
And the transistor 3 is connected with the power supply input end and the PWM input end and is used for being switched on when receiving the PWM signal of the first voltage or being switched off when receiving the PWM signal of the second voltage.
And the voltage output end 4 is connected with the transistor and used for outputting a PWM signal of a third voltage when the transistor is conducted.
Wherein the first voltage is greater than the second voltage; the third voltage is greater than the first voltage.
Illustratively, as shown in fig. 2, because some platforms have their own relatively low PWM voltages (assumed to be 1.8V/3.3V), a relatively high PWM voltage, or a linear voltage value (e.g., 0V — VIN), can be obtained through the transistor (Q1105).
In this embodiment, by setting the power input (VIN), PWM of a voltage close to the magnitude of the power input (VIN) can be obtained on the D pole of the transistor (Q1105).
The invention can flexibly increase the voltage level required by the peripheral equipment, can be completed by replacing a proper circuit device, and has convenience and low cost.
Example two
Based on the foregoing embodiments, the same parts as those in the foregoing embodiments are not repeated in detail in this embodiment, and a PWM voltage control circuit is provided in this embodiment, as shown in fig. 2 to 5, and specifically includes:
and the power supply input end 1 is used for inputting a voltage signal set according to the peripheral requirement.
And a PWM input terminal 2 for inputting a PWM signal of a first voltage or a PWM signal of a second voltage.
And the transistor 3 is connected with the power supply input end and the PWM input end and is used for being switched on when receiving the PWM signal of the first voltage or being switched off when receiving the PWM signal of the second voltage.
And the voltage output end 4 is connected with the transistor and used for outputting a PWM signal of a third voltage when the transistor is conducted.
Wherein the first voltage is greater than the second voltage; the third voltage is greater than the first voltage.
In this embodiment, the method further includes: and the voltage dividing resistor is connected with the power input end and is used for dividing the voltage of the voltage signal.
Illustratively, as shown in fig. 2, a voltage dividing resistor (R1138) is connected to the power input terminal (VIN) for dividing the input voltage.
In this embodiment, the method further includes:
and the RC filter circuit is connected with the PWM input end and the transistor and is used for filtering noise waves.
Illustratively, as shown in fig. 2, the resistor (R1140) and the capacitor (C3305) form an RC filter circuit for filtering the PWM signal inputted from the PWM input terminal.
The RC filter circuit includes: a filter resistor and a first capacitor; the filter resistor is connected with the PWM input end and the transistor; the first end of the first capacitor is connected with the filter resistor, and the second end of the first capacitor is grounded.
One end of the first capacitor (C3305) is connected with the filter resistor (R1140), and the other end is grounded. The filter resistor (R1140) is also connected to the G-pole of the transistor (Q1105).
In this embodiment, the method further includes:
and the current limiting resistor is connected with the divider resistor, the transistor and the voltage output end and is used for limiting the current of the output signal of the voltage output end.
For example, as shown in fig. 2, the current limiting resistor (R1139) may be used as a current limiting resistor when the capacitor (C3303) is not connected, and may be used as a charging delay resistor after the capacitor (C3303) is connected.
In this embodiment, it is preferable to further include:
and the second capacitor is connected with the current-limiting resistor and the voltage output end and is used for forming an RC circuit with the current-limiting resistor so that the second capacitor is charged by the PWM signal output by the transistor, and the voltage output end outputs linear voltage.
Illustratively, as shown in fig. 2, the second capacitor (C3303) is connected to the current limiting resistor (R1139) and also to the voltage output terminal (VOUT).
Specifically, the charging of the second capacitor (C3303) by the PWM on the transistor (Q1105) can be realized through an RC circuit composed of a current-limiting resistor (R1139) and the second capacitor (C3303), so as to obtain a voltage.
Illustratively, with respect to circuit critical devices:
the transistor (Q1105) is selected taking into account the GS voltage and the DS voltage of the transistor (Q1105). (i.e., the maximum value of input PWM is larger than Gsth turn-on voltage.)
The combination of the current limiting resistor (R1139) and the second capacitor (C3303) RC is linked to the duty and frequency of the PWM, which affects the value of the voltage output VOUT () as a linear output voltage.
It is conventionally recommended that the second capacitor (C3303) be 1UF and the current limiting resistor (R1139) be 2.2 k.
In this embodiment, preferably, a first terminal of the transistor is connected to the RC filter circuit, a second terminal of the transistor is grounded, and a third terminal of the transistor is connected to the power input terminal and the voltage output terminal.
In this embodiment, by adjusting duty of the PWM signal inputted from the PWM input terminal, the voltage output terminal (VOUT) can be outputted with different voltage values to the second capacitor (C3303), thereby realizing linear adjustment of the peripheral device.
In addition, the second capacitor (C3303) can be selectively disconnected according to the requirement, and if the second capacitor (C3303) is removed, a stable PWM (maximum value is smaller than the amplitude of the power supply input end (VIN)) can be obtained on the voltage output end (VOUT), and the duty ratio is opposite to the output PWM.
In this embodiment, the PWM signal output from the power input terminal (VOUT) is converted into a control signal to control the load chip switch, etc.
In the present embodiment, the present invention is used to convert the lower level PWM to the higher level PWM, and the highest level depends on the withstand voltage of the power input terminal (VIN) and UDS (drain-source voltage), such as 12V, 15V, etc.
The present invention can also convert the PWM signal into a variable voltage value for use in controlling an external device/load (e.g., a linear voltage enabled device). Compared with the IC scheme on the market, the method is simpler, cheaper and more convenient.
EXAMPLE III
The present invention also provides a PWM voltage control method, as shown in fig. 3 and 6, including:
s100, a voltage signal set according to the peripheral requirement is input through a power supply input end.
S200 inputs a PWM signal of a first voltage or a PWM signal of a second voltage using the PWM input terminal.
The S300 is connected to the power input terminal and the PWM input terminal through a transistor, and is turned on when receiving the PWM signal of the first voltage, or turned off when receiving the PWM signal of the second voltage.
The S400 is connected to the transistor through a voltage output terminal, and outputs a PWM signal of a third voltage when the transistor is turned on.
Wherein the first voltage is greater than the second voltage; the third voltage is greater than the first voltage.
In this embodiment, the method further includes:
the second capacitor is connected with the current-limiting resistor and the voltage output end, and forms an RC circuit with the current-limiting resistor, so that the second capacitor is charged by a PWM signal output by the transistor, and the voltage output end outputs linear voltage.
The invention can flexibly and more externally arrange the required voltage level, can be completed by replacing a proper circuit device, and is convenient and low in cost.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or recited in detail in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus/electronic device and method may be implemented in other ways. The above-described embodiments of the apparatus/electronic device are merely exemplary, and the division of the modules or units is merely an example of a logical division, and there may be other divisions when the actual implementation is performed, and for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
It should be noted that the above embodiments can be freely combined as necessary. The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. A PWM voltage control circuit, comprising:
the power supply input end is used for inputting voltage signals set according to peripheral requirements;
a PWM input terminal for inputting a PWM signal of a first voltage or a PWM signal of a second voltage;
the transistor is connected with the power supply input end and the PWM input end and is used for being switched on when receiving the PWM signal of the first voltage or being switched off when receiving the PWM signal of the second voltage;
the voltage output end is connected with the transistor and used for outputting a PWM signal of a third voltage when the transistor is conducted;
wherein the first voltage is greater than the second voltage; the third voltage is greater than the first voltage.
2. The PWM voltage control circuit according to claim 1, comprising:
and the voltage dividing resistor is connected with the power input end and is used for dividing the voltage of the voltage signal.
3. The PWM voltage control circuit according to claim 2, further comprising:
and the RC filter circuit is connected with the PWM input end and the transistor and is used for filtering noise waves.
4. The PWM voltage control circuit according to claim 3, wherein the RC filter circuit comprises: a filter resistor and a first capacitor;
the filter resistor is connected with the PWM input end and the transistor;
the first end of the first capacitor is connected with the filter resistor, and the second end of the first capacitor is grounded.
5. The PWM voltage control circuit according to claim 4, further comprising:
and the current limiting resistor is connected with the divider resistor, the transistor and the voltage output end and is used for limiting the current of the output signal of the voltage output end.
6. The PWM voltage control circuit according to claim 5, further comprising:
and the second capacitor is connected with the current-limiting resistor and the voltage output end and is used for forming an RC circuit with the current-limiting resistor so that the second capacitor is charged by the PWM signal output by the transistor, and the voltage output end outputs linear voltage.
7. The PWM voltage control circuit according to any one of claims 1-6, wherein a first terminal of the transistor is connected to the RC filter circuit, a second terminal of the transistor is connected to ground, and a third terminal of the transistor is connected to the power input terminal and the voltage output terminal.
8. A PWM voltage control method, comprising:
inputting a voltage signal set according to the peripheral requirement through a power supply input end;
inputting a PWM signal of a first voltage or a PWM signal of a second voltage by using a PWM input end;
the power supply is connected with the power supply input end and the PWM input end through a transistor, and is switched on when receiving the PWM signal of the first voltage, or is switched off when receiving the PWM signal of the second voltage;
a voltage output end is connected with the transistor, and when the transistor is conducted, a PWM signal of a third voltage is output;
wherein the first voltage is greater than the second voltage; the third voltage is greater than the first voltage.
9. The PWM voltage control method according to claim 8, further comprising:
the second capacitor is connected with the current-limiting resistor and the voltage output end, and forms an RC circuit with the current-limiting resistor, so that the second capacitor is charged by a PWM signal output by the transistor, and the voltage output end outputs linear voltage.
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| CN202110890877.2A CN113436586B (en) | 2021-08-04 | 2021-08-04 | PWM voltage control circuit and method |
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| CN202110890877.2A CN113436586B (en) | 2021-08-04 | 2021-08-04 | PWM voltage control circuit and method |
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| JP2001008446A (en) * | 1999-06-16 | 2001-01-12 | Fuji Xerox Co Ltd | Power unit |
| CN204791908U (en) * | 2015-07-10 | 2015-11-18 | 深圳市迅族科技有限公司 | Liquid crystal display image brightness regulating circuit |
| CN107071957A (en) * | 2016-12-28 | 2017-08-18 | 惠州Tcl照明电器有限公司 | LED light modulating devices and system based on encoded signal |
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| CN211557147U (en) * | 2020-03-12 | 2020-09-22 | 湖北汉瑞景汽车智能系统有限公司 | Programmable adjustable boosting power circuit |
| CN212519502U (en) * | 2020-08-07 | 2021-02-09 | 广东美的制冷设备有限公司 | Remote controller control circuit, circuit board and remote controller |
| CN212875685U (en) * | 2020-07-14 | 2021-04-02 | 协禧电机股份有限公司 | Direct current voltage conversion circuit |
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2021
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001008446A (en) * | 1999-06-16 | 2001-01-12 | Fuji Xerox Co Ltd | Power unit |
| CN204791908U (en) * | 2015-07-10 | 2015-11-18 | 深圳市迅族科技有限公司 | Liquid crystal display image brightness regulating circuit |
| CN206461521U (en) * | 2016-11-15 | 2017-09-01 | 惠州市蓝微新源技术有限公司 | A kind of PWM DC voltage circuits |
| CN107071957A (en) * | 2016-12-28 | 2017-08-18 | 惠州Tcl照明电器有限公司 | LED light modulating devices and system based on encoded signal |
| CN107911037A (en) * | 2017-12-11 | 2018-04-13 | 成都互聚科技有限公司 | A kind of strong switching power supply of job stability |
| CN211557147U (en) * | 2020-03-12 | 2020-09-22 | 湖北汉瑞景汽车智能系统有限公司 | Programmable adjustable boosting power circuit |
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| CN113436586B (en) | 2023-04-25 |
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