CN213069600U - PWM speed regulation circuit - Google Patents
PWM speed regulation circuit Download PDFInfo
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- CN213069600U CN213069600U CN202021848088.XU CN202021848088U CN213069600U CN 213069600 U CN213069600 U CN 213069600U CN 202021848088 U CN202021848088 U CN 202021848088U CN 213069600 U CN213069600 U CN 213069600U
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Abstract
The utility model discloses a PWM speed governing circuit, include: the control module is provided with an I/O port; the control module is used for detecting the input of a PWM signal in an external signal, processing the PWM signal and outputting corresponding speed regulation; the first input end of the first current limiting module is connected with a power supply, and the second input end of the first current limiting module is used for being connected with an external signal; the input end of the switch module is connected with the output end of the first current limiting module; the input end of the pull-up module is connected with the output end of the switch module, and the output end of the pull-up module is connected with the power supply; and the input end of the second current limiting module is connected between the input end of the pull-up module and the output end of the switch module, and the output end of the second current limiting module is connected to the I/O port. The technical scheme of the utility model can carry out the output settlement of speed governing through control module, according to the PWM duty cycle of setting for wantonly, realize multiple speed governing, simple structure and controllable.
Description
Technical Field
The utility model relates to a speed governing circuit field, in particular to PWM speed governing circuit.
Background
With the continuous development of modern electronic technology, PWM (Pulse Width Modulation) speed regulation circuits are very wide, and users have certain requirements for corresponding PWM speed regulation circuits.
In a conventional PWM speed regulation circuit, a plurality of components are often used to regulate a PWM signal, but the conventional PWM speed regulation circuit generally can only set a fixed duty ratio for the PWM signal, and therefore, the speed regulation can only be carried out according to the fixed duty ratio, so that the speed regulation of the circuit is fixed and difficult to regulate.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a PWM speed governing circuit can set for the PWM duty cycle wantonly to realize multiple speed governing, simple structure and controllable.
The embodiment of the utility model provides a PWM speed governing circuit, include:
the control module is provided with an I/O port;
the first input end of the first current limiting module is connected with a power supply, and the second input end of the first current limiting module is used for being connected with an external signal;
the input end of the switch module is connected with the output end of the first current limiting module;
the input end of the pull-up module is connected with the output end of the switch module, and the output end of the pull-up module is connected with the power supply;
the input end of the second current limiting module is connected between the input end of the pull-up module and the output end of the switch module, and the output end of the second current limiting module is connected to the I/O port;
the first current limiting module is used for reducing a first input voltage of the switch module, and the switch module is used for realizing on-off in a circuit; the second current limiting module is used for reducing a second input voltage of the control module; the control module is used for detecting the input of a PWM signal in an external signal, processing the PWM signal and outputting corresponding speed regulation.
According to the utility model discloses one or more technical scheme that the embodiment provides has following beneficial effect at least: the embodiment of the utility model provides a PWM speed governing circuit is provided with control module, first current limiting module, switch module, pull-up module and second current limiting module, and when external signal input, whether there is the input of PWM signal in the control module detection circuitry, when having the PWM signal in the external signal of input, control module makes according to this PWM signal and handles and export corresponding speed governing. Compared with the prior art, the technical scheme of the utility model the output that can carry out the speed governing through control module is set for, according to the PWM duty cycle of setting for wantonly, realizes multiple speed governing, simple structure and controllable.
According to some embodiments of the present invention, the PWM speed regulation circuit further comprises a decoupling module, the decoupling module comprises a capacitor, one end of the capacitor is connected to the output end of the second current limiting module between the I/O ports, and the other end of the capacitor is connected to the reference ground.
According to some embodiments of the present invention, the switch module includes a triode, the base of the triode with the output of the first current limiting module is connected, the projecting pole of the triode is connected to the reference ground, the collecting electrode of the triode with the input of the pull-up module is connected, the input of the second current limiting module is connected to the input of the pull-up module between the collecting electrode of the triode.
According to some embodiments of the utility model, first current-limiting module includes first resistance, second resistance and third resistance, the one end of first resistance with the power is connected, the other end of first resistance passes through the second resistance is connected to the base of triode, the one end of third resistance is connected to the second resistance between the base of triode, the other end of third resistance is connected to reference ground, the other end of first resistance with still be used for between the second resistance with external signal connects.
According to some embodiments of the present invention, the pull-up module includes a fourth resistor, one end of the fourth resistor and the power supply are connected, the other end of the fourth resistor and the collector of the triode are connected, the input of the second current limiting module is connected to the other end of the fourth resistor between the collector of the triode.
According to some embodiments of the invention, the second current limiting module comprises a fifth resistor, one end of the fifth resistor is connected to the other end of the fourth resistor between the collectors of the triodes, and the other end of the fifth resistor is connected to the I/O port.
According to some embodiments of the present invention, the control module includes a single chip control chip, the single chip control chip is provided with the I/O port.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a PWM speed regulation circuit according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a PWM speed regulation circuit according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of a PWM speed regulation circuit according to an embodiment of the present invention.
Reference numerals:
a control module 100; a first current limiting module 200; a switch module 300; a pull-up module 400; a second current limiting module 500, a decoupling module 600.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, etc., is the orientation or positional relationship shown on the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. The terms first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth and the like, if any, are used for distinguishing technical features only and are not to be construed as indicating or implying relative importance or implying any number or order of indicated technical features.
In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.
Referring to fig. 1, an embodiment of the present invention provides a PWM speed regulation circuit, including: a control module 100 provided with an I/O port; a first input end of the first current limiting module 200 is connected with a power supply, and a second input end of the first current limiting module 200 is used for being connected with an external signal; the input end of the switch module 300 is connected with the output end of the first current limiting module 200; the input end of the pull-up module 400 is connected with the output end of the switch module 300, and the output end of the pull-up module 400 is connected with a power supply; a second current limiting module 500, an input terminal of the second current limiting module 500 is connected between an input terminal of the pull-up module 400 and an output terminal of the switch module 300, and an output terminal of the second current limiting module 500 is connected to the I/O port; the first current limiting module 200 is used for reducing a first input voltage of the switch module 300, and the switch module 300 is used for realizing on-off in a circuit; the second current limiting module 500 is used for reducing a second input voltage of the control module 100; the control module 100 is configured to detect an input of a PWM signal in the external signal, process the PWM signal, and output a corresponding speed adjustment.
In the embodiment of the present invention, the external signal is connected to the second input terminal of the first current limiting module 200, so that the external signal is input to the present PWM speed adjusting circuit. The first current limiting module 200 mainly functions as a current limiting and voltage reducing function to reduce the first input voltage of the switch module 300, so as to protect the switch module 300. The switching module 300 may employ a semiconductor switching device such as a transistor, for example, when a transistor is employed, the transistor may be operated in a saturation region or a cut-off region, so that the transistor is used as a switching device. When the switch module 300 employs a switching device such as a transistor, since the switch module 300 is an open-drain output, the switch module 300 can obtain a high level by providing the pull-up module 400. The pull-up module 400 may also function to limit flow. The second current limiting module 500 mainly functions as a current limiting and voltage reducing function, so that the second input voltage of the control module 100 is reduced to protect the control module 100. The power supply in this embodiment is 5V.
The working principle of the embodiment is as follows: an external signal is input to the PWM speed regulation circuit, the external signal reaches the switch module 300 through the first current limiting module 200, the switch module 300 transmits the external signal to the control module 100 through the second current limiting module 500 when being turned on, the control module 100 detects whether the external signal has an input of a PWM signal, and when the input is the PWM signal, the control module 100 processes the PWM signal and outputs a corresponding speed regulation. For example, when the PWM signal input has a waveform (duty cycle) of 10%, the voltage at the I/O port of the control module 100 is 10% of the 5V pull-up, i.e., 0.5V, and the switching module 300 is turned off. When the PWM signal is inputted with a waveform (duty ratio) of 50%, the voltage at the I/O port of the control module 100 is 50% of 5V pull-up, i.e. 2.5V, the switch module 300 is turned on, and the control module 100 detects a speed regulation of 50%. When the PWM signal is input with a waveform (duty ratio) of 100%, the voltage of the I/O port of the control module 100 is 5V, the PWM speed-adjusting circuit outputs at full speed, and the highest output voltage of this embodiment is 5V, so that the I/O port of the control module 100 can work safely. In other embodiments, the PWM signal input may also be in other waveforms (duty ratios), so that when the control module 100 detects the PWM signal, the control module 100 rapidly performs processing and outputs corresponding speed regulation to realize controllable adjustment.
Because the PWM speed regulation circuit of this embodiment mainly regulates speed by outputting the PWM signal, when designing the PCB, it is necessary to set the PWM speed regulation circuit away from the interference source, so as to avoid the interference source from interfering with the output of the PWM signal, which causes a large difference between the fed back PWM signal and the actual PWM signal.
According to the utility model discloses one or more technical scheme that the embodiment provides has following beneficial effect at least: the embodiment of the utility model provides a PWM speed governing circuit is provided with control module 100, first current limiting module 200, switch module 300, pull-up module 400 and second current limiting module 500, and when external signal was imported, whether control module 100 detection circuitry had the input of PWM signal, when having the PWM signal in the external signal of input, control module 100 made the corresponding speed governing of processing and output according to this PWM signal. Compared with the prior art, the technical scheme of the utility model the output that can carry out the speed governing through control module is set for, according to the PWM duty cycle of setting for wantonly, realizes multiple speed governing, simple structure and controllable.
According to some embodiments of the present invention, the PWM speed regulation circuit further comprises a decoupling module 600, the decoupling module 600 comprises a capacitor C1, one end of the capacitor C1 is connected between the output end of the second current limiting module 500 and the I/O port, and the other end of the capacitor C1 is connected to the reference ground. By arranging the decoupling module 600 to remove noise on the pins of the power supply tube, the unpredictable feedback of the PWM speed regulation circuit of the present embodiment is prevented, thereby avoiding affecting the normal operation of other circuits. For example, referring to fig. 2, the PWM throttle circuit of the present embodiment uses a common-emitter-connected transistor Q1. Due to internal resistance in the power supply, when an ac signal is input to the base of the transistor Q1, an ac current is generated in the power supply current (between the base and the collector current), which affects the base of the bias terminal, resulting in unstable output voltage of the transistor Q1. This embodiment removes the above effect by using a capacitor C1 to ac ground to the power supply.
According to some embodiments of the present invention, the switch module 300 includes the triode Q1, the base of the triode Q1 is connected with the output of the first current limiting module 200, the emitter of the triode Q1 is connected to the reference ground, the collector of the triode Q1 is connected with the input of the pull-up module 400, and the input of the second current limiting module 500 is connected between the input of the pull-up module 400 and the collector of the triode Q1. In the embodiment, the switch module 300 is provided, and the transistor Q1 in the switch module 300 is used as a switch device, so that on/off in a control loop can be realized, and the switch module has practicability.
According to some embodiments of the present invention, the first current limiting module 200 includes a first resistor R1, a second resistor R2 and a third resistor R3, one end of the first resistor R1 is connected to the power supply, the other end of the first resistor R1 is connected to the base of the transistor Q1 through the second resistor R2, one end of the third resistor R3 is connected to the second resistor R2 and between the bases of the transistor Q1, the other end of the third resistor R3 is connected to the reference ground, and the other end of the first resistor R1 and the second resistor R2 are also used for being connected to an external signal. The first current limiting module 200 is configured to perform a current limiting step-down function, so that the first input voltage to the transistor Q1 is reduced to protect the transistor Q1. For example, the second resistor R2 is a base current-limiting resistor of the transistor Q1, and the second resistor R2 can prevent the transistor Q1 from being burned out due to an excessive base current, so as to perform a current-limiting and voltage-reducing function; the third resistor R3 is used as a pull-down resistor of the triode Q1, the triode Q1 can be prevented from being burnt out when the base current is too large, the triode Q1 is protected, the third resistor R3 can also prevent the triode Q1 from generating misoperation under the influence of noise signals, and the triode Q1 is cut off more reliably. For example, when the external input signal is uncertain, the third resistor R3 can be effectively grounded, thereby preventing malfunction.
According to some embodiments of the present invention, the pull-up module 400 includes a fourth resistor R4, one end of the fourth resistor R4 is connected to the power supply, the other end of the fourth resistor R4 is connected to the collector of the transistor Q1, and the input of the second current limiting module 500 is connected to the other end of the fourth resistor R4 and between the collectors of the transistor Q1. The fourth resistor R4 in this embodiment is a pull-up resistor of the transistor Q1, and the collector of the transistor Q1 is at a high level by setting the fourth resistor R4. The indeterminate signal is clamped high by the fourth resistor R4, and the fourth resistor R4 also acts as a current limiter, injecting current into the transistor Q1.
According to some embodiments of the present invention, the second current limiting module 500 comprises a fifth resistor R5, one end of the fifth resistor R5 is connected to the other end of the fourth resistor R4 and between the collector of the transistor Q1, and the other end of the fifth resistor R5 is connected to the I/O port. The second current limiting module 500 is arranged to perform a current limiting and voltage reducing function, so that the second input voltage of the control module 100 is reduced to protect the control module 100.
According to some embodiments of the present invention, control module 100 comprises a single chip control chip, which is provided with an I/O port. The single chip microcomputer control chip can detect the input of an external signal so as to respond quickly and output corresponding speed regulation. Referring to FIG. 2, VS in FIG. 2 indicates the I/0 port of the one-chip control chip in the control module 100.
Referring to fig. 3, a detailed description is given of a flow of the PWM speed control circuit according to an embodiment of the present invention. It is to be understood that the following description is illustrative only and is not intended as a specific limitation on the invention.
When a PWM signal is input, for example, when the PWM signal input is 10%, the PWM signal speed regulation detected by the one-chip microcomputer control chip is 10%, so the speed regulation output by the one-chip microcomputer control chip is 10%. When the input of the PWM signal is 50%, the speed regulation of the PWM signal detected by the singlechip control chip is 50%, so that the speed regulation of the output of the singlechip control chip is 50%. When the PWM signal output is 100%, the voltage of the I/O of the single chip microcomputer control chip is 5V, and the speed regulation of the output of the single chip microcomputer control chip is 100%.
The specific working principle is as follows: when an external signal is input, the singlechip controls the chip detection circuit to determine whether a PWM signal (speed regulation signal) is input. When the input of the PWM signal is 10% waveform (duty ratio), the voltage of the I/O port of the singlechip control chip is 10% of the pull-up of 5V, namely 0.5V, and the triode Q1 is pulled down and grounded. When the input of the PWM signal is 50% of waveform (duty ratio), the voltage of the I/O port of the singlechip control chip is 50% of 5V pull-up, namely 2.5V, the triode Q1 is conducted, and the singlechip control chip detects 50% of speed regulation. When the PWM signal is input into a waveform (duty ratio) of 100%, the voltage of an I/O port of the singlechip control chip is 5V at the moment, and the PWM speed regulating circuit outputs at full speed. The PWM speed regulating circuit of the embodiment can output different speed regulation, can arbitrarily set the PWM duty ratio, and sets the current speed through the single chip microcomputer control chip to realize controllable regulation.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "specifically," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While the preferred embodiments of the present invention have been described, the present invention is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are intended to be included within the scope of the present invention defined by the appended claims.
Claims (7)
1. A PWM speed regulation circuit, comprising:
the control module is provided with an I/O port;
the first input end of the first current limiting module is connected with a power supply, and the second input end of the first current limiting module is used for being connected with an external signal;
the input end of the switch module is connected with the output end of the first current limiting module;
the input end of the pull-up module is connected with the output end of the switch module, and the output end of the pull-up module is connected with the power supply;
the input end of the second current limiting module is connected between the input end of the pull-up module and the output end of the switch module, and the output end of the second current limiting module is connected to the I/O port;
the first current limiting module is used for reducing a first input voltage of the switch module, and the switch module is used for realizing on-off in a circuit; the second current limiting module is used for reducing a second input voltage of the control module; the control module is used for detecting the input of a PWM signal in an external signal, processing the PWM signal and outputting corresponding speed regulation.
2. The PWM speed regulation circuit according to claim 1, wherein: the PWM speed regulation circuit further comprises a decoupling module, the decoupling module comprises a capacitor, one end of the capacitor is connected between the output end of the second current limiting module and the I/O port, and the other end of the capacitor is connected to the reference ground.
3. The PWM speed regulation circuit according to claim 1, wherein: the switch module comprises a triode, the base electrode of the triode is connected with the output end of the first current limiting module, the emitting electrode of the triode is connected to the reference ground, the collector electrode of the triode is connected with the input end of the pull-up module, and the input end of the second current limiting module is connected between the input end of the pull-up module and the collector electrode of the triode.
4. The PWM speed regulation circuit according to claim 3, characterized in that: the first current limiting module comprises a first resistor, a second resistor and a third resistor, one end of the first resistor is connected with the power supply, the other end of the first resistor is connected to the base of the triode through the second resistor, one end of the third resistor is connected to the second resistor and between the bases of the triodes, the other end of the third resistor is connected to a reference ground, and the other end of the first resistor and the second resistor are further used for being connected with an external signal.
5. The PWM speed regulation circuit according to claim 3, characterized in that: the pull-up module comprises a fourth resistor, one end of the fourth resistor is connected with the power supply, the other end of the fourth resistor is connected with the collector electrode of the triode, and the input end of the second current limiting module is connected between the other end of the fourth resistor and the collector electrode of the triode.
6. The PWM speed regulation circuit according to claim 5, wherein: the second current limiting module comprises a fifth resistor, one end of the fifth resistor is connected between the other end of the fourth resistor and the collector of the triode, and the other end of the fifth resistor is connected to the I/O port.
7. The PWM speed regulation circuit according to any one of claims 1 to 6, characterized in that: the control module comprises a single chip microcomputer control chip, and the single chip microcomputer control chip is provided with the I/O port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021848088.XU CN213069600U (en) | 2020-08-28 | 2020-08-28 | PWM speed regulation circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021848088.XU CN213069600U (en) | 2020-08-28 | 2020-08-28 | PWM speed regulation circuit |
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| CN213069600U true CN213069600U (en) | 2021-04-27 |
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| CN202021848088.XU Active CN213069600U (en) | 2020-08-28 | 2020-08-28 | PWM speed regulation circuit |
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