CN216718951U - Voltage and power regulating circuit controlled by PWM and AC solid-state relay - Google Patents
Voltage and power regulating circuit controlled by PWM and AC solid-state relay Download PDFInfo
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- CN216718951U CN216718951U CN202220158911.7U CN202220158911U CN216718951U CN 216718951 U CN216718951 U CN 216718951U CN 202220158911 U CN202220158911 U CN 202220158911U CN 216718951 U CN216718951 U CN 216718951U
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Abstract
The utility model discloses a voltage-regulating power-regulating circuit controlled by PWM (pulse-width modulation) and an alternating-current solid-state relay, wherein the voltage-regulating power-regulating circuit controlled by PWM comprises a PWM signal input circuit, a master control circuit, a silicon controlled switch circuit, a conduction angle control circuit and a zero-crossing detection circuit, the input end of the PWM signal input circuit is connected with the PWM signal input, the output end of the PWM signal input circuit is connected with the input end of the master control circuit, the silicon controlled switch circuit is connected between the input end and the output end in series, the input end is connected with an alternating-current power supply, the output end is connected with a load, the zero-crossing detection circuit is used for detecting a zero-crossing point signal of the alternating-current power supply and outputting the zero-crossing point signal to the master control circuit, and the master control circuit is used for correspondingly giving a trigger signal to the conduction angle control circuit according to the received PWM signal and the zero-crossing point signal so as to control the conduction angle of the silicon controlled switch circuit. The utility model realizes the functions of voltage regulation and power regulation through the PWM signal, greatly reduces the cost of products, and has simple circuit structure and easy realization.
Description
Technical Field
The utility model belongs to the technical field of circuits, and particularly relates to a voltage and power regulating circuit controlled by PWM and an alternating current solid-state relay.
Background
The voltage regulating and power regulating circuit is used for regulating the output voltage and the output power, and is widely applied to occasions such as motor control, heating control and the like. At present, the commonly used voltage regulating and power regulating circuit adopts an analog quantity control mode, the analog quantity control is divided into voltage control and current control, the analog quantity of the voltage control is generally 0-5V DC or 0-10V DC, and the analog quantity of the current control is generally 4-20 mA. However, the analog output module in the market is expensive, which results in high cost of the equipment using the existing voltage and power regulating circuit, and the PWM signal output module is much cheaper than the analog output module.
Disclosure of Invention
The utility model aims to provide a voltage-regulating and power-regulating circuit controlled by PWM (pulse-width modulation) to solve the technical problems.
In order to achieve the purpose, the utility model adopts the technical scheme that: a voltage and power regulating circuit controlled by PWM comprises a PWM signal input circuit, a master control circuit, a silicon controlled switch circuit, a conduction angle control circuit and a zero-crossing detection circuit, wherein the input end of the PWM signal input circuit is connected with the PWM signal input, the output end of the PWM signal input circuit is connected with the input end of the master control circuit, the silicon controlled switch circuit is connected between the input end and the output end in series, the input end is connected with an alternating current power supply, the output end is connected with a load, the zero-crossing detection circuit is used for detecting a zero-crossing point signal of the alternating current power supply and outputting the zero-crossing point signal to the master control circuit, and the master control circuit is used for correspondingly giving a trigger signal to the conduction angle control circuit according to the received PWM signal and the zero-crossing point signal so as to control the conduction angle of the silicon controlled switch circuit.
Further, the silicon controlled switch circuit is a bidirectional conduction switch circuit or a unidirectional conduction switch circuit.
Furthermore, the silicon controlled switch circuit is realized by adopting a bidirectional silicon controlled rectifier or a unidirectional silicon controlled rectifier.
Further, the conduction angle control circuit comprises an NPN triode Q1 and an optocoupler A1, the NPN triode Q1 is connected in series in a loop of an input end of the optocoupler A1, a base of the NPN triode Q1 is connected with an output end of the main control circuit, and an output end of the optocoupler A1 is connected with a control end of the silicon controlled switch circuit.
Further, the zero-crossing detection circuit comprises a rectifier bridge stack B1, an optical coupler A2 and an NPN triode Q2, wherein the input end of the rectifier bridge stack B1 is connected with an alternating current power supply, the output end of the rectifier bridge stack B1 is connected with the input end of the optical coupler A2, the output end of the optical coupler A2 is connected with the base electrode of the NPN triode Q2, the collector electrode of the NPN triode Q2 is connected with a power supply, the emitter electrode of the NPN triode Q2 is grounded, and the collector electrode of the NPN triode Q2 serves as the output end of the zero-crossing detection circuit and is connected with the input end of the main control circuit.
Furthermore, the zero-crossing detection circuit further comprises a filter circuit, and the filter circuit is connected with the input end of the optical coupler A2 in parallel.
Further, the PWM signal input circuit includes an NPN transistor Q3, a base of the NPN transistor Q3 is connected to the PWM signal input, a collector of the NPN transistor Q3 is connected to the power supply, an emitter of the NPN transistor Q3 is grounded, and a collector of the NPN transistor Q3 is connected to an output terminal of the PWM signal input circuit and an input terminal of the main control circuit.
Furthermore, the power supply circuit is used for supplying power for the voltage-regulating and power-regulating circuit.
Furthermore, the main control circuit is realized by adopting a singlechip.
The utility model also discloses an alternating current solid-state relay which is provided with the voltage and power regulating circuit controlled by the PWM.
The utility model has the beneficial technical effects that:
the utility model realizes the voltage and power regulation functions through the PWM signal, greatly reduces the product cost, and has simple circuit structure and easy realization.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic circuit diagram of an embodiment of the present invention.
Detailed Description
To further illustrate the various embodiments, the utility model provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the utility model and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.
The utility model will now be further described with reference to the accompanying drawings and detailed description.
As shown in FIG. 1, a voltage-regulating and power-regulating circuit controlled by PWM comprises a PWM signal input circuit 500, a main control circuit 100, a silicon controlled switch circuit 300, a conduction angle control circuit 200 and a zero-crossing detection circuit 400, wherein an input end Vin _ of the PWM signal input circuit 100 is connected with the PWM signal input, an output end Vin of the PWM signal input circuit 500 is connected with an input end of the main control circuit 100, the silicon controlled switch circuit 300 is connected in series between an input end 1 and an output end 2, the input end 1 is connected with an AC power supply, the output end 2 is connected with a load, the other end of the load is connected with a zero line, the zero-crossing detection circuit 400 is used for detecting a zero-crossing point signal of the AC power supply and outputting the zero-crossing point signal to the main control circuit 100, the main control circuit 100 is used for correspondingly triggering the conduction angle control circuit 200 according to the received PWM signal and the zero-crossing point signal, thereby controlling the conduction angle of the silicon controlled switch circuit 300, thereby controlling the output voltage, The magnitude of the output power.
In this embodiment, the main control circuit 100 is implemented by using the single chip microcomputer IC1, and the circuit structure is simple, small in size, easy to implement, and low in cost, and the specific circuit structure is as shown in fig. 1, but not limited thereto, and in some embodiments, the main control circuit 100 may also be implemented by using other existing programmable controllers.
In this embodiment, the scr switching circuit 300 is preferably a bidirectional conduction switching circuit, which can realize bidirectional conduction control and reduce power consumption, but is not limited thereto, and in some embodiments, the scr switching circuit 300 may also be a unidirectional conduction switching circuit, such as a switching circuit composed of a single unidirectional thyristor.
Preferably, in this embodiment, the thyristor switching circuit 300 is implemented by using a triac Q4, and the circuit structure is simple and compact, and is easy to implement, but not limited thereto, and in some embodiments, two triacs may be connected in reverse parallel.
In this embodiment, the conduction angle control circuit 200 includes an NPN triode Q1 and an optocoupler a1, the optocoupler a1 is a thyristor output type optocoupler, one output end of the optocoupler a1 is connected in series with a resistor R9 to the input end 1 and a T2 pole of a triac Q4, the other output end of the optocoupler a1 is connected in parallel with a gate G of the triac Q4, and meanwhile, a resistor R10 is connected in parallel between the gate G of the triac and the T1 pole. The positive input end series resistance R2 of the optical coupler A1 is connected with a power supply source plus 5V, the negative input end of the optical coupler A1 is connected with the collector of an NPN triode Q1, the emitter of the NPN triode Q1 is grounded, the base electrode series resistance R3 of the NPN triode Q1 is connected with the pin GP4 (the output end of the main control circuit 100) of the single chip IC1, the conduction angle control circuit 200 is adopted, the circuit structure is simple, the realization is easy, strong and weak current isolation is realized, and the safety and the reliability are improved, but the circuit is not limited to the circuit structure, and in some embodiments, the conduction angle control circuit 200 can also be realized by adopting other existing switch control circuits.
Preferably, the conduction angle control circuit 200 further includes a capacitor C7 and a resistor R4, and the capacitor C7 and the resistor R4 are connected in parallel and then disposed between the base of the transistor Q1 and the ground, so as to further improve stability and reliability.
In this embodiment, the triac switching circuit 300 further includes a resistor R11 and a capacitor C9, the resistor R11 and the capacitor C9 are connected in series and then are connected in parallel with the triac Q4, and the resistor R11 and the capacitor C9 form a resistance-capacitance absorption loop, so that the survival capability of the triac Q4 under electric shock is improved.
In this embodiment, the zero-cross detection circuit 400 includes a rectifier bridge stack B1, an optical coupler a2, and an NPN transistor Q2, an input end of the rectifier bridge stack B1 is connected to an ac power supply, specifically, two input ends of the rectifier bridge stack B1 are respectively connected to an input end 1 and an output end 2, an output end of the rectifier bridge stack is connected to an input end of the optical coupler a2, an output end of the optical coupler a2 is connected to a power supply +5V, another output end is connected to a series resistor R7 and a base of the NPN transistor Q2, a collector series resistor R5 of the NPN transistor Q2 is connected to the power supply +5V, an emitter of the NPN transistor Q2 is grounded, and a collector of the NPN transistor Q2 serves as an output end of the zero-cross detection circuit 400 and is connected to a pin GP5 (an input end of the main control circuit 100) of the monolithic IC 1. By adopting the zero-crossing detection circuit 400, not only is the circuit structure simple and easy to implement, but also strong and weak current isolation is realized, and the safety and reliability are improved, but not limited thereto, and in some embodiments, the zero-crossing detection circuit 400 can also be realized by adopting other existing zero-crossing detection circuits.
Specifically, in the present embodiment, the bridge rectifier B1 is a full bridge rectifier, but the utility model is not limited thereto.
Further, in this embodiment, the zero-cross detection circuit 400 further includes a filter circuit, and the filter circuit is connected in parallel with the input end of the optical coupler a2, so as to further improve the stability and accuracy of the detection signal. Specifically, the filter circuit includes a resistor R8 and a capacitor C5 connected in parallel, but is not limited thereto, and in some embodiments, the filter circuit may be implemented by using other existing filter circuits.
Further, in this embodiment, the zero-cross detection circuit 400 further includes a capacitor C6, and the capacitor C6 is connected between the collector of the NPN transistor Q2 and ground, so as to further improve the stability and accuracy of the detection signal.
Further, in this embodiment, the zero-cross detection circuit 400 further includes resistors R12 and R13, and the resistors R12 and R13 are connected in series to the input end of the rectifier bridge stack B1 for current-limiting protection.
In this embodiment, the PWM signal input circuit 500 includes an NPN transistor Q3, a base series resistor R1 of the NPN transistor Q3 is connected to the input terminal Vin _ of the PWM signal input circuit 500, a collector series resistor R15 of the NPN transistor Q3 is connected to the power supply +5V, an emitter of the NPN transistor Q3 is grounded, and a collector of the NPN transistor Q3 is connected to the pin GP2 (input terminal of the main control circuit 100) of the monolithic IC1 as the output terminal of the PWM signal input circuit 500. By adopting the PWM signal input circuit 500, a wide voltage range input can be realized, the application range is wide, the circuit structure is simple, the implementation is easy, and the cost is low, but not limited thereto.
Preferably, in this embodiment, the PWM signal input circuit 500 further includes a capacitor C8 and a resistor R14, and the capacitor C8 and the resistor R14 are connected in parallel and then disposed between the base of the NPN transistor Q3 and the ground, so as to further improve stability and reliability of the input signal.
Further, in this embodiment, the power supply circuit 600 is further included, and the power supply circuit 600 is connected to an input power supply, and is configured to convert the input power supply into a +5V power supply as a power supply to supply power to the voltage-regulating and power-regulating circuit. The power supply circuit 600 is implemented by using a 5V power supply chip IC2, and the specific circuit structure is shown in fig. 1, but not limited to this, and in some embodiments, it may also be implemented by using other existing power supply circuits.
The working principle is as follows:
the PWM signal is output to the singlechip IC1 through the PWM signal input circuit 500, the singlechip IC1 acquires and processes the PWM signal to obtain the duty ratio of the PWM signal, the zero crossing detection circuit 400 detects the zero crossing point signal of the alternating current power supply and outputs the zero crossing point signal to the singlechip IC1, the singlechip IC1 outputs a corresponding control signal to drive the conduction angle control circuit 200 to work according to the duty ratio of the zero crossing point signal and the PWM signal, so as to control the conduction angle of the bidirectional thyristor Q4, thereby realizing the functions of voltage regulation and power regulation.
The utility model also discloses an alternating current solid-state relay which is provided with the voltage and power regulating circuit controlled by the PWM.
The utility model realizes the voltage and power regulation functions through the PWM signal, greatly reduces the product cost, and has simple circuit structure and easy realization.
While the utility model has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the utility model as defined by the appended claims.
Claims (10)
1. The utility model provides a voltage regulation power regulation circuit through PWM control which characterized in that: the PWM signal input circuit is connected with the PWM signal input end, the output end of the PWM signal input circuit is connected with the input end of the main control circuit, the silicon controlled switch circuit is connected between the input end and the output end in series, the input end is connected with an alternating current power supply, the output end is connected with a load, the zero crossing detection circuit is used for detecting a zero crossing point signal of the alternating current power supply and outputting the zero crossing point signal to the main control circuit, and the main control circuit is used for correspondingly giving a trigger signal to the conduction angle control circuit according to the received PWM signal and the zero crossing point signal so as to control the conduction angle of the silicon controlled switch circuit.
2. The voltage-regulating power-regulating circuit controlled by PWM according to claim 1, characterized in that: the silicon controlled switch circuit is a bidirectional conduction switch circuit or a unidirectional conduction switch circuit.
3. The voltage-regulating power-regulating circuit controlled by PWM according to claim 2, characterized in that: the silicon controlled switch circuit is realized by adopting a bidirectional silicon controlled rectifier or a unidirectional silicon controlled rectifier.
4. The voltage-regulating power-regulating circuit controlled by PWM according to any one of claims 1 to 3, characterized in that: the conduction angle control circuit comprises an NPN triode Q1 and an optocoupler A1, the NPN triode Q1 is connected in series in a loop of an input end of the optocoupler A1, a base electrode of the triode Q1 is connected with an output end of the main control circuit, and an output end of the optocoupler A1 is connected with a control end of the silicon controlled switch circuit.
5. The voltage-regulating power-regulating circuit controlled by PWM according to claim 1, characterized in that: the zero-crossing detection circuit comprises a rectifier bridge stack B1, an optocoupler A2 and an NPN triode Q2, wherein the input end of the rectifier bridge stack B1 is connected with an alternating current power supply, the output end of the rectifier bridge stack B1 is connected with the input end of the optocoupler A2, the output end of the optocoupler A2 is connected with the base electrode of the NPN triode Q2, the collector electrode of the NPN triode Q2 is connected with a power supply, the emitter electrode of the NPN triode Q2 is grounded, and the collector electrode of the NPN triode Q2 serves as the output end of the zero-crossing detection circuit and is connected with the input end of the main control circuit.
6. The voltage-regulating power-regulating circuit controlled by PWM according to claim 5, characterized in that: the zero-crossing detection circuit further comprises a filter circuit, and the filter circuit is connected with the input end of the optocoupler A2 in parallel.
7. The voltage-regulating power-regulating circuit controlled by PWM according to claim 1, characterized in that: the PWM signal input circuit comprises an NPN triode Q3, the base electrode of the NPN triode Q3 is connected with PWM signal input, the collector electrode of the NPN triode Q3 is connected with a power supply, the emitting electrode of the NPN triode Q3 is grounded, and the collector electrode of the NPN triode Q3 is connected with the output end of the PWM signal input circuit and the input end of the main control circuit.
8. The voltage-regulating power-regulating circuit controlled by PWM according to claim 1, characterized in that: the power supply circuit is used for supplying power for the voltage-regulating and power-regulating circuit.
9. The voltage-regulating power-regulating circuit controlled by PWM according to claim 1, characterized in that: the main control circuit is realized by adopting a singlechip.
10. An alternating current solid state relay characterized by: the voltage and power regulating circuit controlled by PWM according to any one of claims 1-9 is provided.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220158911.7U CN216718951U (en) | 2022-01-20 | 2022-01-20 | Voltage and power regulating circuit controlled by PWM and AC solid-state relay |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220158911.7U CN216718951U (en) | 2022-01-20 | 2022-01-20 | Voltage and power regulating circuit controlled by PWM and AC solid-state relay |
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| CN216718951U true CN216718951U (en) | 2022-06-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115424809A (en) * | 2022-08-15 | 2022-12-02 | 珠海市奥德维科技有限公司 | Demagnetizing device and method, storage medium |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115424809A (en) * | 2022-08-15 | 2022-12-02 | 珠海市奥德维科技有限公司 | Demagnetizing device and method, storage medium |
| CN115424809B (en) * | 2022-08-15 | 2023-12-15 | 珠海市奥德维科技有限公司 | Demagnetizing device and method, and storage medium |
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