CN216752168U - PWM signal voltage regulating circuit and electronic equipment - Google Patents
PWM signal voltage regulating circuit and electronic equipment Download PDFInfo
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- CN216752168U CN216752168U CN202123294960.8U CN202123294960U CN216752168U CN 216752168 U CN216752168 U CN 216752168U CN 202123294960 U CN202123294960 U CN 202123294960U CN 216752168 U CN216752168 U CN 216752168U
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Abstract
The utility model relates to a PWM signal voltage regulating circuit and an electronic device. The method comprises the following steps: the PWM signal input unit is used for providing an initial PWM signal, the PWM signal output unit is used for outputting a voltage-regulating PWM signal, and the constant current unit and the voltage division unit are arranged, wherein the PWM signal input unit comprises a first signal input end and a second signal input end; the first end and the second end of the constant current unit are connected with the first signal input end, the third end of the constant current unit is connected with the first end of the voltage division unit and the PWM signal output unit, the fourth end of the constant current unit is connected with the second signal input end, and the second end of the voltage division unit is grounded. The utility model can conveniently realize any low-amplitude PWM signal output.
Description
Technical Field
The present invention relates to the field of PWM control technologies, and in particular, to a PWM signal voltage regulating circuit and an electronic device.
Background
The high level voltage of the PWM signal sent by the PLC controller for industrial control is generally 24V, while the input voltage of the dimming terminal of the LED driver generally used in the market at present is required to be 12V at most, so that level signal conversion needs to be performed between the controller and the dimming control terminal of the LED driver. Most of the PWM dimming signals inputted from the dimming terminal of the LED driver require both the duty ratio D of the PWM and the high level U1 of the PWM signal.
And the LED driving in the occasions of tunnel lighting and the like also adopts PWM signal dimming control, and hundreds of LED driving power supplies are connected in parallel on one dimming control bus. Due to the line loss of the dimming bus, the amplitude signal of the PWM signal received by the LED driving power supply at the tail end of the dimming bus is seriously attenuated, so that the LED driving power supply at the tail end of the dimming bus is not controlled by dimming control to influence use, and energy conservation and emission reduction can not be realized.
The level conversion circuit widely used at present is an active circuit, and the energy of power supply is not easy to realize in some fields such as tunnel lighting, and the like, so that the application cost is increased, one more power supply line needs to be arranged, and the reliability of an application system is reduced.
SUMMERY OF THE UTILITY MODEL
The utility model provides a PWM signal voltage regulating circuit and an electronic device.
The technical scheme adopted by the utility model for solving the technical problems is as follows: a PWM signal voltage regulating circuit is constructed, comprising: the PWM signal input unit comprises a first signal input end and a second signal input end;
the first end and the second end of the constant current unit are connected with the first signal input end, the third end of the constant current unit is connected with the first end of the voltage division unit and the PWM signal output unit, the fourth end of the constant current unit is connected with the second signal input end, and the second end of the voltage division unit is grounded.
Preferably, in the PWM signal voltage regulating circuit of the present invention, the constant current unit includes a first switching tube, a second switching tube, a first resistor and a second resistor;
the first end of the first switch tube and the first end of the first resistor are connected with the first signal input end, the second end of the first switch tube is connected with the second end of the first resistor and the first end of the second switch tube, the third end of the first switch tube is connected with the second end of the second switch tube and the first end of the second resistor, the second end of the second resistor is connected with the second signal input end, and the third end of the second switch tube is connected with the first end of the voltage division unit.
Preferably, in the PWM signal voltage regulating circuit of the present invention, the first switching tube includes a transistor Q1-a, and the second switching tube includes a transistor Q1-B;
an emitter of the triode Q1-A is connected with the first signal input end and the first end of the first resistor, a base of the triode Q1-A is connected with the second end of the first resistor and an emitter of the triode Q1-B, a collector of the triode Q1-A is connected with a base of the triode Q1-B and the first end of the second resistor, and a collector of the triode Q1-B is connected with the first end of the voltage division unit.
Preferably, in the PWM signal voltage regulating circuit of the present invention, the constant current unit includes a reference voltage chip, a third switching tube, a fourth switching tube, a third resistor, and a fourth resistor;
the first end of reference voltage chip, the second end of reference voltage chip with the first end of third resistance is all connected first signal input part, the third end of reference voltage chip is connected the first end of third switch tube, the second end of third switch tube is connected the second end of fourth switch tube the third end of third switch tube with the first end of fourth resistance, the second end of fourth resistance with second signal input part ground connection, the second end of third resistance is connected the first end of fourth switch tube, the third end of fourth switch tube is connected the first end of bleeder unit.
Preferably, in the PWM signal voltage regulating circuit of the present invention, the third switching tube includes a transistor Q2-B, and the fourth switching tube includes a transistor Q2-a;
an emitter of the triode Q2-B is connected with a third end of the reference voltage chip, a collector of the triode Q2-B is connected with a first end of the fourth resistor, a base of the triode Q2-B and a base of the triode Q2-A, an emitter of the triode Q2-A is connected with a second end of the third resistor, and a collector of the triode Q2-A is connected with a first end of the voltage division unit.
Preferably, the PWM signal voltage regulating circuit of the present invention further comprises an isolation optocoupler;
the first end of the isolation optocoupler is connected with the third end of the constant current unit, the second end of the isolation optocoupler is connected with the second signal input end, the third end of the isolation optocoupler is used for inputting a power supply voltage, and the fourth end of the isolation optocoupler is connected with the first end of the voltage division unit.
Preferably, in the PWM signal voltage regulating circuit of the present invention, the first signal input terminal is connected to the positive pole of the initial PWM signal, and the second signal input terminal is used for being connected to the negative pole of the initial PWM signal.
Preferably, in the PWM signal voltage regulating circuit of the present invention, the voltage dividing unit includes a voltage dividing resistor, a first end of the voltage dividing resistor is connected to the output end of the constant current unit, and a second end of the voltage dividing resistor is grounded.
Preferably, in the PWM signal voltage regulating circuit of the present invention, the PWM signal output unit further includes a buffer circuit, and the voltage regulating PWM signal is input to the post-stage circuit through the buffer circuit.
In addition, an electronic device of the present invention includes the PWM signal voltage adjusting circuit according to any one of the above.
The PWM signal voltage regulating circuit and the electronic equipment have the following beneficial effects that: any low amplitude PWM signal output that can conveniently realize.
Drawings
The utility model will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a logic block diagram of an embodiment of a PWM signal voltage regulator circuit of the present invention;
FIG. 2 is a schematic circuit diagram of an embodiment of a PWM signal voltage regulator circuit according to the present invention;
fig. 3 is a schematic circuit diagram of an embodiment of a PWM signal voltage regulating circuit according to the present invention.
Detailed Description
For a more clear understanding of the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in fig. 1, in a first embodiment of a PWM signal voltage regulating circuit according to the present invention, the PWM signal voltage regulating circuit includes: a PWM signal input unit for providing an initial PWM signal, a PWM signal output unit 140 for outputting a voltage-regulating PWM signal, and a constant current unit 120 and a voltage dividing unit 130, wherein the PWM signal input unit includes a first signal input terminal 111 and a second signal input terminal 112; the first terminal and the second terminal of the constant current unit 120 are connected to the first signal input terminal 111, the third terminal of the constant current unit 120 is connected to the first terminal of the voltage dividing unit 130 and the PWM signal output unit 140, the fourth terminal of the constant current unit 120 is connected to the second signal input terminal 112, and the second terminal of the voltage dividing unit 130 is grounded. Specifically, an initial PWM signal is input through the PWM signal input unit, and the initial PWM signal can be understood as an initial signal that needs to be adjusted, for example, a high voltage PWM signal. The initial PWM signal is divided by the voltage dividing unit 130 after passing through the constant current unit 120, and finally the required voltage-regulating PWM signal is obtained at the PWM signal output unit 140. The constant current source is used for realizing the constant current of the PWM signal output.
Optionally, as shown in fig. 2, in the PWM signal voltage regulating circuit of the present invention, the constant current unit 120 includes a first switch tube, a second switch tube, a first resistor and a second resistor; the first end of the first switch tube and the first end of the first resistor are connected to the first signal input end 111, the second end of the first switch tube is connected to the second end of the first resistor and the first end of the second switch tube, the third end of the first switch tube is connected to the second end of the second switch tube and the first end of the second resistor, the second end of the second resistor is connected to the second signal input end 112, and the third end of the second switch tube is connected to the first end of the voltage dividing unit 130. Specifically, the constant current unit 120 may be composed of two sets of switching tubes and two sets of resistors, where a first switching tube is turned on according to a voltage signal of the first resistor, and drives a second switching tube to be turned on after the first switching tube is turned on, and reduces an output current of the second switching tube, thereby achieving a constant current. The third terminal of the second switch tube outputs the divided voltage through the voltage dividing unit 130, and finally the low-voltage PWM signal is output.
Optionally, the first switching tube includes a transistor Q1-a, and the second switching tube includes a transistor Q1-B; an emitter of the transistor Q1-a is connected to the first signal input terminal 111 and the first end of the first resistor, a base of the transistor Q1-a is connected to the second end of the first resistor and an emitter of the transistor Q1-B, a collector of the transistor Q1-a is connected to a base of the transistor Q1-B and the first end of the second resistor, and a collector of the transistor Q1-B is connected to the first end of the voltage dividing unit 130. Specifically, in the constant current unit 120, the first switching tube and the second switching tube are respectively composed of a transistor Q1-a and a transistor Q1-B. Wherein the resistor R1 (corresponding to the first resistor) forms a threshold voltage between the emitter and the base of the transistor Q1-a, and when the threshold voltage meets the requirement, the transistor Q1-a is turned on, and due to the effect of the resistor R2 (corresponding to the second resistor), the voltage difference between the emitter and the base of the transistor Q1-B also begins to decrease. And the collector of the transistor Q1-B outputs constant current.
Optionally, as shown in fig. 3, in the PWM signal voltage regulating circuit of the present invention, the constant current unit 120 includes a reference voltage chip, a third switching tube, a fourth switching tube, a third resistor, and a fourth resistor; the first end of reference voltage chip, the second end of reference voltage chip and the first end of third resistance all connect first signal input part 111, the first end of third switch tube is connected to the third end of reference voltage chip, the second end of third switch tube is connected the second end of fourth switch tube, the third end of third switch tube and the first end of fourth resistance, the second end and the second signal input part 112 ground connection of fourth resistance, the first end of fourth switch tube is connected to the second end of third resistance, the first end of bleeder unit 130 is connected to the third end of fourth switch tube. Specifically, in the constant current unit 120, the conduction control of the third switching tube and the fourth switching tube is performed through a precision constant current source module integrated circuit, that is, a reference voltage chip U1, so that the constant current output at the output end of the fourth switching tube is realized, and the step-down PWM signal output at the output end of the fourth switching tube is realized through the voltage dividing unit 130.
Optionally, the third switching tube includes a transistor Q2-B, and the fourth switching tube includes a transistor Q2-a; an emitting electrode of the triode Q2-B is connected with the third end of the reference voltage chip, a collecting electrode of the triode Q2-B is connected with the first end of the fourth resistor, a base electrode of the triode Q2-B and a base electrode of the triode Q2-A, an emitting electrode of the triode Q2-A is connected with the second end of the third resistor, and a collecting electrode of the triode Q2-A is connected with the first end of the voltage division unit 130. Specifically, the third switch tube and the fourth switch tube may be respectively composed of a transistor Q2-B and a transistor Q2-a. When the current flowing through the resistor R4 (corresponding to the third resistor) is increased, the voltage on the reference voltage chip U1 is increased, meanwhile, the current flowing through the reference voltage chip U1 is increased, the current of the triode Q2-B is increased, the voltage on the resistor R5 (corresponding to the fourth resistor) is increased, the voltages of the base electrode and the emitter electrode of the triode Q2-B and the triode Q2-A are reduced, and the current flowing through the triode Q2-A is reduced, so that the purpose of constant current is achieved. Similarly, when the current flowing through the resistor R4 decreases, the current flowing through the transistor Q2-A increases, and a constant current is realized.
Optionally, as shown in fig. 2, the PWM signal voltage regulating circuit of the present invention further includes an isolation optocoupler; the first end of the isolation optocoupler is connected with the third end of the constant current unit 120, the second end of the isolation optocoupler is connected with the second signal input end 112, the third end of the isolation optocoupler is used for inputting a power supply voltage, and the fourth end of the isolation optocoupler is connected with the first end of the voltage division unit 130. The isolation of the PWM signal input circuit and the PWM signal output circuit can be achieved through the isolation optocoupler, and therefore the isolation degree of the circuit is improved. Meanwhile, the constant current source generates a voltage with a certain amplitude at the resistor R3, and thus the output voltage of the PWM is determined.
Optionally, the first signal input end 111 is connected to the positive pole of the initial PWM signal, and the second signal input end 112 is used for connecting to the negative pole of the initial PWM signal. The input of the constant current unit 120 is connected to the positive electrode of the PWM signal, and the constant current unit is used to conduct the constant current output according to the positive electrode of the PWM signal.
Optionally, the voltage dividing unit 130 includes a voltage dividing resistor, a first end of the voltage dividing resistor is connected to the output end of the constant current unit 120, and a second end of the voltage dividing resistor is grounded. Specifically, the voltage dividing unit 130 is composed of a precision resistor, and can set the constant current output of the constant current unit 120 to obtain the required low voltage PWM signal.
Optionally, the PWM signal output unit 140 further includes a buffer circuit, and the voltage-regulating PWM signal is input to the post-stage circuit through the buffer circuit. Specifically, the voltage-regulating PWM signal in the PWM signal output unit 140 may be buffered and amplified by an operational amplifier or the like, for example, a voltage follower formed by the operational amplifier is sent to a subsequent circuit.
In addition, an electronic device of the present invention includes the PWM signal voltage adjusting circuit according to any one of the above aspects. The voltage of the PWM signal in the circuit can be adjusted according to the requirement, so that the use scenes of the PWM signal are diversified.
It is to be understood that the foregoing examples, while indicating the preferred embodiments of the utility model, are given by way of illustration and description, and are not to be construed as limiting the scope of the utility model; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several changes and modifications can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (10)
1. A PWM signal voltage regulation circuit, comprising: the PWM signal input unit comprises a first signal input end and a second signal input end;
the first end and the second end of the constant current unit are connected with the first signal input end, the third end of the constant current unit is connected with the first end of the voltage division unit and the PWM signal output unit, the fourth end of the constant current unit is connected with the second signal input end, and the second end of the voltage division unit is grounded.
2. The PWM signal voltage regulating circuit according to claim 1, wherein the constant current unit comprises a first switching tube, a second switching tube, a first resistor and a second resistor;
the first end of the first switch tube and the first end of the first resistor are connected with the first signal input end, the second end of the first switch tube is connected with the second end of the first resistor and the first end of the second switch tube, the third end of the first switch tube is connected with the second end of the second switch tube and the first end of the second resistor, the second end of the second resistor is connected with the second signal input end, and the third end of the second switch tube is connected with the first end of the voltage division unit.
3. The PWM signal voltage regulation circuit of claim 2, wherein the first switching tube comprises a transistor Q1-A, and the second switching tube comprises a transistor Q1-B;
an emitter of the triode Q1-A is connected with the first signal input end and the first end of the first resistor, a base of the triode Q1-A is connected with the second end of the first resistor and an emitter of the triode Q1-B, a collector of the triode Q1-A is connected with a base of the triode Q1-B and the first end of the second resistor, and a collector of the triode Q1-B is connected with the first end of the voltage division unit.
4. The PWM signal voltage regulating circuit according to claim 1, wherein the constant current unit comprises a reference voltage chip, a third switching tube, a fourth switching tube, a third resistor and a fourth resistor;
the first end of reference voltage chip, the second end of reference voltage chip with the first end of third resistance is all connected first signal input part, the third end of reference voltage chip is connected the first end of third switch tube, the second end of third switch tube is connected the second end of fourth switch tube the third end of third switch tube with the first end of fourth resistance, the second end of fourth resistance with second signal input part ground connection, the second end of third resistance is connected the first end of fourth switch tube, the third end of fourth switch tube is connected the first end of bleeder unit.
5. The PWM signal voltage regulating circuit of claim 4, wherein the third switching tube comprises a transistor Q2-B, and the fourth switching tube comprises a transistor Q2-A;
an emitting electrode of the triode Q2-B is connected with a third end of the reference voltage chip, a collecting electrode of the triode Q2-B is connected with a first end of the fourth resistor, a base electrode of the triode Q2-B and a base electrode of the triode Q2-A, an emitting electrode of the triode Q2-A is connected with a second end of the third resistor, and a collecting electrode of the triode Q2-A is connected with a first end of the voltage dividing unit.
6. The PWM signal voltage regulation circuit according to claim 1, further comprising an isolation optocoupler;
the first end of the isolation optocoupler is connected with the third end of the constant current unit, the second end of the isolation optocoupler is connected with the second signal input end, the third end of the isolation optocoupler is used for inputting a power supply voltage, and the fourth end of the isolation optocoupler is connected with the first end of the voltage division unit.
7. The PWM signal voltage regulating circuit according to claim 1, wherein the first signal input terminal is connected to a positive pole of the initial PWM signal, and the second signal input terminal is connected to a negative pole of the initial PWM signal.
8. The PWM signal voltage regulating circuit according to claim 1, wherein the voltage dividing unit includes a voltage dividing resistor, a first end of the voltage dividing resistor is connected to the output terminal of the constant current unit, and a second end of the voltage dividing resistor is grounded.
9. The PWM signal voltage adjusting circuit according to claim 1, wherein the PWM signal output unit further includes a buffer circuit, and the voltage-adjusting PWM signal is input to a subsequent stage circuit through the buffer circuit.
10. An electronic device comprising the PWM signal voltage regulating circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123294960.8U CN216752168U (en) | 2021-12-24 | 2021-12-24 | PWM signal voltage regulating circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123294960.8U CN216752168U (en) | 2021-12-24 | 2021-12-24 | PWM signal voltage regulating circuit and electronic equipment |
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| Publication Number | Publication Date |
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| CN216752168U true CN216752168U (en) | 2022-06-14 |
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| CN202123294960.8U Active CN216752168U (en) | 2021-12-24 | 2021-12-24 | PWM signal voltage regulating circuit and electronic equipment |
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- 2021-12-24 CN CN202123294960.8U patent/CN216752168U/en active Active
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