CN209964031U - Zero-crossing control circuit and electronic equipment - Google Patents
Zero-crossing control circuit and electronic equipment Download PDFInfo
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- CN209964031U CN209964031U CN201920767205.0U CN201920767205U CN209964031U CN 209964031 U CN209964031 U CN 209964031U CN 201920767205 U CN201920767205 U CN 201920767205U CN 209964031 U CN209964031 U CN 209964031U
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Abstract
The application provides a zero-crossing control circuit, which comprises a silicon controlled switch circuit, a current zero-crossing detection circuit and a controller. And the first end of the silicon controlled switch circuit is respectively and electrically connected with the live wire and the trigger power supply. The input end of the current zero-crossing detection circuit is respectively and electrically connected with the second end of the silicon controlled switch circuit and the load. The controller is electrically connected with the current zero-crossing detection circuit. The first output end of the controller is electrically connected with the control end of the silicon controlled switch circuit. The controller judges the zero-crossing position of the output signal according to the output signal of the current zero-crossing detection circuit and adjusts the conduction angle of the silicon controlled switch circuit based on the zero-crossing position. The application also provides an electronic device. The current zero-crossing detection circuit is matched with the silicon controlled switch circuit and the controller, so that the current zero-crossing position of the output signal can be accurately detected, the conduction angle of the silicon controlled switch circuit is adjusted based on the current zero-crossing position, and the control difficulty of controlling the inductive load by the silicon controlled switch is reduced.
Description
Technical Field
The present application relates to the field of power electronics technologies, and in particular, to a zero-crossing control circuit and an electronic device.
Background
The thyristor is a high-power electrical component, also called thyristor. It has the advantages of small volume, high efficiency, long service life, etc. The high-power LED driving device is widely applied to industrial products such as household appliances and the like, can be used as a high-power driving device in an automatic control system, and realizes the control of high-power equipment by using a low-power control. It is widely applied to speed regulating systems, power regulating systems and follow-up systems of alternating current and direct current motors.
At present, a voltage zero-crossing detection circuit is generally adopted in a control scheme for a silicon controlled rectifier, a current zero-crossing position is estimated and obtained by using a power supply voltage waveform actually detected by the voltage zero-crossing detection circuit in an alternating current circuit connected to an inductive load, and a conduction angle of the silicon controlled rectifier is adjusted according to the estimated current zero-crossing position to control the conduction of the silicon controlled rectifier. However, since inductive loads (such as ac motors) may generate different degrees of current lag, the voltage and current phase difference may vary irregularly, which results in a larger error between the current zero-crossing position detected and estimated by the conventional voltage zero-crossing detection circuit and the actual current zero-crossing position.
In inductive loads such as small household appliances, the current provided by a system power supply is generally low in consideration of cost, but in order to avoid the influence of the error on the effective conduction of the thyristor, the trigger pulse width of the G pin of the thyristor needs to be very wide, and the trigger current I of the thyristorGTIt is required to be large, and thus, a large amount of system power current is consumed, increasing the cost.
SUMMERY OF THE UTILITY MODEL
Based on this, it is necessary to adopt a voltage zero-crossing detection circuit for the conventional thyristor control scheme, detect and estimate the obtained current zero-crossing bitSetting the trigger current I of the controlled silicon with larger errorGTThe zero-crossing control circuit and the electronic equipment are provided, which have the problems of large consumption of system power supply current and cost increase due to large requirement.
A zero-crossing control circuit comprising:
the first end of the silicon controlled switch circuit is respectively and electrically connected with a live wire and a trigger power supply;
the input end of the current zero-crossing detection circuit is respectively and electrically connected with the second end of the silicon controlled switch circuit and the load;
the first input end of the controller is electrically connected with the output end of the current zero-crossing detection circuit, the first output end of the controller is electrically connected with the control end of the silicon controlled switch circuit, and the second output end of the controller is grounded;
the controller determines the current zero-crossing position of the output signal according to the output signal of the current zero-crossing detection circuit, and adjusts the conduction angle of the silicon controlled switch circuit based on the current zero-crossing position.
In one embodiment, the controller outputs a high-low level based on the current zero-crossing position;
when the first output end of the controller outputs a high level, the silicon controlled switch circuit maintains the current state;
when the first output end of the controller outputs a low level, the silicon controlled switch circuit is conducted.
In one embodiment, the thyristor switching circuit comprises:
and the first end of the silicon controlled switch is electrically connected with the live wire, the second end of the silicon controlled switch is electrically connected with the input end of the current zero-crossing detection circuit, and the control end of the silicon controlled switch is electrically connected with the first output end of the controller.
In one embodiment, the thyristor switching circuit further comprises:
and the first resistor is connected in parallel with two ends of the silicon controlled switch.
In one embodiment, the current zero crossing detection circuit includes:
one end of the second resistor is electrically connected with the second end of the silicon controlled switch circuit, and the other end of the second resistor is electrically connected with the first input end of the controller;
the anode of the first diode is electrically connected with the other end of the second resistor and the first input end of the controller respectively, and the cathode of the first diode is electrically connected with the live wire;
one end of the third resistor is electrically connected with the cathode of the first diode, and the other end of the third resistor is respectively electrically connected with the other end of the second resistor and the first input end of the controller;
one end of the fourth resistor is electrically connected with the other end of the second resistor and the first input end of the controller respectively, and the other end of the fourth resistor is grounded;
and the anode of the second diode is grounded, and the cathode of the second diode is respectively electrically connected with the other end of the second resistor and the first input end of the controller.
In one embodiment, the zero-crossing control circuit further comprises:
and the current-limiting protection circuit is connected between the first output end of the controller and the control end of the silicon controlled switch circuit in series.
In one embodiment, the current limiting protection circuit includes:
and the fifth resistor is connected between the first output end of the controller and the control end of the silicon controlled switch circuit in series.
In one embodiment, the zero-crossing control circuit further comprises:
and a first pin of the resistance-capacitance voltage reduction circuit is electrically connected with the first end of the silicon controlled switch circuit, the live wire and a third pin of the resistance-capacitance voltage reduction circuit respectively, a second pin of the resistance-capacitance voltage reduction circuit is electrically connected with the zero line, and a fourth pin of the resistance-capacitance voltage reduction circuit is grounded.
In one embodiment, the zero-crossing control circuit further comprises:
and one end of the filter circuit is electrically connected with the first input end of the controller and the output end of the current zero-crossing detection circuit respectively, and the other end of the filter circuit is grounded.
In one embodiment, the filter circuit includes:
and one end of the capacitor is electrically connected with the first input end of the controller and the output end of the current zero-crossing detection circuit respectively, and the other end of the capacitor is grounded.
An electronic device comprising a zero-crossing control circuit as described in any of the above embodiments; and
and the load is also electrically connected with the zero line.
Compared with the prior art, the zero-crossing control circuit and the electronic equipment have the advantages that the current signal is output to the controller in real time through the current zero-crossing detection circuit, the current zero-crossing position of the output signal can be accurately detected through the cooperation of the controller, the conduction angle of the silicon controlled switch circuit is adjusted according to the current zero-crossing position, and therefore on-off control over the silicon controlled switch circuit is achieved.
Drawings
Fig. 1 is a circuit block diagram of a zero-crossing control circuit according to an embodiment of the present application;
fig. 2 is a schematic circuit diagram of a zero-crossing control circuit according to an embodiment of the present application;
fig. 3 is a timing diagram of a voltage zero-crossing waveform of an AC power source and a thyristor zero-crossing detection waveform according to an embodiment of the present application;
FIG. 4 is a timing diagram illustrating current zero crossings of a load according to an embodiment of the present application;
fig. 5 is a schematic circuit structure diagram of an electronic device according to an embodiment of the present application.
10 zero crossing control circuit
100 silicon controlled switch circuit
101 live wire
102 trigger power supply
103 load
104 neutral wire
110 silicon controlled switch
120 first resistance
20 electronic device
200 current zero-crossing detection circuit
210 second resistance
220 first diode
230 third resistor
240 fourth resistor
250 second diode
300 controller
400 current limiting protection circuit
410 fifth resistor
500 resistance-capacitance voltage reduction circuit
600 filter circuit
610 capacitance
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and those skilled in the art will be able to make similar modifications without departing from the spirit of the application and it is therefore not intended to be limited to the embodiments disclosed below.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, an embodiment of the present application provides a zero-crossing control circuit 10, which includes: the thyristor switch circuit 100, the current zero crossing detection circuit 200 and the controller 300. The first end of the thyristor switch circuit 100 is electrically connected to the live line 101 and the trigger power supply 102, respectively. The input end of the current zero-crossing detection circuit 200 is electrically connected to the second end of the thyristor switch circuit 100 and the load 103, respectively. A first input terminal of the controller 300 is electrically connected to an output terminal of the current zero crossing detection circuit 200. A first output terminal of the controller 300 is electrically connected to a control terminal of the thyristor switch circuit 100. A second output of the controller 300 is connected to ground. The controller 300 determines a current zero-crossing position of the output signal according to the output signal of the current zero-crossing detection circuit 200, and adjusts a conduction angle of the thyristor switching circuit 100 based on the current zero-crossing position.
In one embodiment, the zero-crossing control circuit 10 may be applied to household appliances, especially small household appliances with inductive load, such as fans and the like. The controller 300 is utilized to cooperate with the current zero-crossing detection circuit 200 to accurately detect the current zero-crossing position of the output signal, and the conduction angle of the silicon controlled switch circuit 100 is adjusted based on the current zero-crossing position, so that the silicon controlled switch circuit 100 can be effectively conducted by the pulse width of the silicon controlled switch within dozens of microseconds, and therefore, the small household appliance with inductive load can save the system power supply current, the load of a power supply system is greatly reduced, and the effect of saving electric energy is achieved.
It is understood that the specific structure of the thyristor switching circuit 100 is not particularly limited as long as it has the function of receiving the trigger current conduction of the trigger power supply 102. The specific structure of the thyristor switching circuit 100 can be selected according to actual requirements. In one embodiment, the thyristor switching circuit 100 may be formed of a triac. In one embodiment, the thyristor switching circuit 100 may also be formed of a conventional thyristor. In one embodiment, the trigger power supply 102 may be a +5V power supply. In one embodiment, the load 103 is preferably an inductive load, such as an ac motor or the like.
It is understood that the specific structure of the current zero-crossing detection circuit 200 is not particularly limited as long as it has a zero-crossing signal for detecting an alternating current. In one embodiment, the current zero crossing detection circuit 200 may be comprised of an optocoupler having zero crossing detection. In one embodiment, the current zero crossing detection circuit 200 may also be constructed by a second resistor 210, a first diode 220, a third resistor 230, a fourth resistor 240, and a second diode 250 (as shown in fig. 2).
In one embodiment, one end of the second resistor 210 is electrically connected to the second end of the thyristor switch circuit 100. The other end of the second resistor 210 is electrically connected to a first input terminal of the controller 300. The anode of the first diode 220 is electrically connected to the other end of the second resistor 210 and the first input terminal of the controller 300. The cathode of the first diode 220 is electrically connected to the live line 101.
In one embodiment, one end of the third resistor 230 is electrically connected to the cathode of the first diode 220. The other end of the third resistor 230 is electrically connected to the other end of the second resistor 210 and the first input terminal of the controller 300. One end of the fourth resistor 240 is electrically connected to the other end of the second resistor 210 and the first input end of the controller 300, respectively. The other end of the fourth resistor 240 is grounded. The anode of the second diode 250 is grounded. The cathode of the second diode 250 is electrically connected to the other end of the second resistor 210 and the first input terminal of the controller 300.
In one embodiment, when the AC power source (i.e., the live line 101) is in a positive half-cycle, the second resistor 210(R103) and the first diode 220(D101) are turned on, and the level at the output terminal of the current zero-crossing detection circuit 200 is clamped by the first diode 220 and generates a high signal. When the AC power source (i.e., the live line 101) is in the negative half cycle, the second resistor 210(R103) and the second diode 250(D102) are turned on, and the level of the output terminal of the current zero crossing detection circuit 200 is clamped by the second diode 250(D102) and generates a low level signal. Therefore, the output end of the current zero-crossing detection circuit 200 will generate symmetrical high and low levels based on the positive and negative periods of the AC power, and the controller 300 can determine the zero-crossing position of the output signal according to the switching of the high and low levels, thereby adjusting the conduction angle of the silicon controlled switch circuit 100.
It is understood that the specific structure of the controller 300 may not be particularly limited as long as it has the function of determining the current zero-crossing position of the output signal according to the output signal of the current zero-crossing detection circuit 200 and adjusting the conduction angle of the thyristor switch circuit 100 based on the current zero-crossing position. The specific structure of the controller 300 can be selected according to actual requirements. In one embodiment, the controller 300 may be a single chip microcomputer (e.g., an MCU or a model MC96F8208SM single chip microcomputer). In one embodiment, the controller 300 may also be a micro-programmed controller. In one embodiment, the controller 300 may be of the type PIC16F 15324. The controller 300 can accurately judge the current zero-crossing position of the signal output by the current zero-crossing detection circuit 200, so that the conduction angle of the silicon controlled switch circuit 100 can be effectively adjusted, and the control difficulty of controlling inductive loads such as an alternating current motor by silicon controlled can be further reduced.
In the embodiment, the current zero-crossing detection circuit 200 outputs a current signal to the controller 300 in real time, the current zero-crossing position of the output signal can be accurately detected by using the cooperation of the controller 300, and the conduction angle of the silicon controlled switch circuit 100 is adjusted according to the current zero-crossing position, so that the on-off control of the silicon controlled switch circuit 100 is realized, and the control difficulty of controlling inductive loads such as an alternating current motor by using a silicon controlled switch can be reduced.
In one embodiment, the controller 300 outputs high and low levels based on the current zero crossing position. When the first output terminal of the controller 300 outputs a high level, the thyristor switch circuit 100 maintains the current state. When the first output terminal of the controller 300 outputs a low level, the thyristor switch circuit 100 is turned on.
In one embodiment, the thyristor switch circuit 100 is turned on when the controller 300 turns on the trigger signal (i.e., when the first output terminal of the controller 300 outputs a low level). When the current flowing through the thyristor switching circuit 100 approaches zero, the thyristor switching circuit 100 is automatically turned off, and the turn-off time is the zero crossing point of the current of the load 103. At this time, the controller 300 selects and outputs a high level and a low level based on a preset algorithm, so as to control the conduction angle of the silicon controlled switch circuit 100, thereby achieving the purpose of adjusting the conduction angle of the silicon controlled switch circuit 100.
In one embodiment, if the controller 300 selects to output a high level based on a preset algorithm, the thyristor switch circuit 100 maintains the current state (i.e., the off state). If the controller 300 selects to output a low level based on a preset algorithm, the scr switching circuit 100 is turned on. The preset algorithm is an existing control algorithm.
Referring to fig. 2, in one embodiment, the thyristor switching circuit 100 includes a thyristor switch 110. A first terminal of the thyristor switch 110 is electrically connected to the live line 101. The second terminal of the thyristor switch 110 is electrically connected to the input terminal of the current zero-crossing detection circuit 200. The control terminal of the thyristor switch 110 is electrically connected to the first output terminal of the controller 300.
The specific type of the thyristor switch 110 can be selected according to actual requirements. In one embodiment, the thyristor switch 110 may be a triac. In one embodiment, the thyristor switch 110 may also be a unidirectional thyristor.
In one embodiment, when the thyristor 110 is naturally turned off, the potential of pin T2 in fig. 2, i.e., the potential at point a, is determined by the potential of the zero line 104 of the AC power source. When the thyristor switch 110 is turned on, due to the characteristics of the thyristor: v at positive half-cycle conductionT1-T2Approximately equal to 1V, V when conducting in negative half cycleT2-T1Approximately equals to 1V, and therefore, the voltage at the pin A, which is the time T2 when the thyristor switch 110 is turned on, is considered to be limited to 4-6V. The first input terminal pin of the controller 300 is set to be in a high impedance state, so the position of the point B follows kirchhoff's current law, and the potential of the point B is:
wherein R103 is the second resistor 210; r101 is the third resistor 230; r102 is the fourth resistor 240; for the sake of calculation, the values R103 and R102 may be 10 and R101, respectively, and the above formula is summarized as follows:
namely, the voltage value at the point B is as follows:
when the potential of the point a is 4V or 6V when the thyristor switch 110 is turned on, the potential of the point B is calculated by the above formula to be about 3.43V; for a 5V system, the controller 300 may detect that the B-point level signal is a high level signal at this time.
In one embodiment, the zero crossing waveform of the voltage of the AC power source is synchronized with the zero crossing detection waveform of the thyristor (i.e., the thyristor 110) when the thyristor 110 is in the on state (e.g., CH2 and CH3 in fig. 3). In one embodiment, the thyristor switch 110 is turned on when the controller 300 turns on the trigger signal (i.e., when the first output terminal of the controller 300 outputs a low level). When the current flowing through the thyristor 110 approaches zero, the thyristor 110 is turned off automatically, and the turn-off time is the zero crossing point of the current of the load 103 (e.g., "C, D, E" position of CH3 waveform in fig. 4).
In one embodiment, when the thyristor switch 110 is turned off automatically at the "C" point, which is a falling edge interrupt signal, the controller 300 (e.g., MCU) can easily determine and detect the "C" point, i.e., the "C" point is the zero-crossing point of the current of the load 103. When the thyristor switch 110 is automatically turned off at the point "D", at this time, it is a rising edge interrupt signal, the rising edge interrupt signal may be subjected to AD/a conversion, and the accurate position of the point "D" is monitored and obtained in real time through the converted signal, that is, the point "D" is also a current zero-crossing point of the load 103. After the controller 300 determines the current zero-crossing position of the load 103, the trigger pulse width of the thyristor switch 110 is only very narrow (tens of microseconds), and the thyristor switch 110 can be accurately and rapidly triggered to be switched on by the controller 300, so that the load of a power supply system can be greatly reduced, and the purpose of saving cost is achieved.
In one embodiment, the thyristor switching circuit 100 further comprises a first resistor 120. The first resistor 120 is connected in parallel to two ends of the thyristor switch 110. In one embodiment, the first resistor 120 may be a piezo-resistor. The thyristor switch 110 is protected from damage by the first resistor 120.
In one embodiment, the zero-crossing control circuit 10 further includes a current limiting protection circuit 400. The current limiting protection circuit 400 is connected in series between a first output terminal of the controller 300 and a control terminal of the thyristor switch circuit 100.
It is understood that the specific circuit structure of the current limiting protection circuit 400 is not specifically limited, as long as the current limiting protection circuit has the function of limiting current and protecting the controller 300 from damage. In one embodiment, the current limiting protection circuit 400 may be a capacitor. In one embodiment, the current limiting protection circuit 400 may be an inductor. The current-limiting protection circuit 400 can protect the controller 300 in real time, and prevent the controller 300 from being damaged due to sudden current change.
In one embodiment, the current limiting protection circuit 400 includes a fifth resistor 410. The fifth resistor 410 is connected in series between the first output terminal of the controller 300 and the control terminal of the thyristor switch circuit 100. In one embodiment, the fifth resistor 410 may be a fixed resistance resistor. In one embodiment, the fifth resistor 410 may also be a resistor with an adjustable resistance. The fifth resistor 410 can protect the controller 300 in real time, and prevent the controller 300 from being damaged by sudden current change.
In one embodiment, the zero-crossing control circuit 10 further comprises: the RC step-down circuit 500. The first pin of the rc step-down circuit 500 is electrically connected to the first end of the scr switching circuit 100, the live line 101, and the third pin of the rc step-down circuit 500, respectively. The second pin of the rc step-down circuit 500 is electrically connected to the neutral line 104. The fourth pin of the rc step-down circuit 500 is grounded.
It is understood that the specific structure of the rc step-down circuit 500 is not limited specifically, as long as the function of transforming and outputting a stable voltage is ensured. The specific structure of the rc step-down circuit 500 can be selected according to actual requirements. In one embodiment, the rc voltage dropping circuit 500 may be constructed by a conventional rc voltage dropping module and a first capacitor. In one embodiment, the rc step-down circuit 500 may be replaced by a transformer with a voltage transformation function, or the like. The rc step-down circuit 500 is utilized to reduce the input voltage of the live line 101 to +5V (i.e. the trigger power source 102) and provide the input voltage to the scr switch 110, so as to provide the trigger voltage to the scr switch 110.
In one embodiment, the zero crossing control circuit 10 further comprises a filter circuit 600. One end of the filter circuit 600 is electrically connected to a first input end of the controller 300 and an output end of the current zero-crossing detection circuit 200, respectively. The other end of the filter circuit 600 is grounded.
It is understood that the specific structure of the filter circuit 600 is not limited specifically, as long as the function of filtering is ensured. The specific structure of the filter circuit 600 can be selected according to actual requirements. In one embodiment, the filter circuit 600 may be comprised of a filter. In one embodiment, the filter circuit 600 may also be composed of a capacitor 610. Specifically, one end of the capacitor 610 is electrically connected to the first input end of the controller 300 and the output end of the current zero-crossing detection circuit 200, and the other end of the capacitor 610 is grounded. The signal sent to the controller 300 can be made more stable by the filter circuit 600.
To sum up, this application passes through current zero-crossing detection circuit 200 exports current signal in real time to controller 300 utilizes controller 300's cooperation can accurately detect out output signal's current zero-crossing position, and according to current zero-crossing position adjustment silicon controlled switch circuit 100's conduction angle, thereby it is right to realize silicon controlled switch circuit 100's on-off control, because this application can accurately detect out current zero-crossing position, the pulse width of silicon controlled can accomplish very narrowly just can make silicon controlled switch circuit effectively switch on, consequently can reduce the consumption of system's power, the cost is reduced.
Referring to fig. 5, an embodiment of the present application provides an electronic device 20, which includes the zero-crossing control circuit 10 and the load 103 according to any of the embodiments described above. The load 103 is also electrically connected to a neutral wire 104. In one embodiment, the load 103 is preferably an inductive load, such as an ac motor, etc., although the load 103 may be a resistive load. The electronic device 20 may be a common household appliance such as an electric fan, an electric iron, or the like.
In the electronic device 20 of this embodiment, the current zero-crossing detection circuit 200 in the zero-crossing control circuit 10 monitors the conduction state of the thyristor switch circuit 100 in real time, and outputs a signal to the controller 300, and by using the cooperation of the controller 300, the current zero-crossing position of the output signal can be accurately detected, and the conduction angle of the thyristor switch circuit 100 is adjusted based on the current zero-crossing position, so that on-off control of the thyristor switch circuit 100 is realized, and the control difficulty of controlling the electronic device 20 by using a thyristor can be reduced.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A zero-crossing control circuit, comprising:
the first end of the silicon controlled switch circuit is respectively and electrically connected with a live wire and a trigger power supply;
the input end of the current zero-crossing detection circuit is respectively and electrically connected with the second end of the silicon controlled switch circuit and the load; and
the first input end of the controller is electrically connected with the output end of the current zero-crossing detection circuit, the first output end of the controller is electrically connected with the control end of the silicon controlled switch circuit, and the second output end of the controller is grounded;
the controller determines the current zero-crossing position of the output signal according to the output signal of the current zero-crossing detection circuit, and adjusts the conduction angle of the silicon controlled switch circuit based on the current zero-crossing position.
2. A zero-crossing control circuit as claimed in claim 1, wherein the controller outputs a high-low level based on the current zero-crossing position;
when the first output end of the controller outputs a high level, the silicon controlled switch circuit maintains the current state;
when the first output end of the controller outputs a low level, the silicon controlled switch circuit is conducted.
3. A zero-crossing control circuit as claimed in claim 1, wherein the thyristor switch circuit comprises:
and the first end of the silicon controlled switch is electrically connected with the live wire, the second end of the silicon controlled switch is electrically connected with the input end of the current zero-crossing detection circuit, and the control end of the silicon controlled switch is electrically connected with the first output end of the controller.
4. A zero-crossing control circuit as claimed in claim 1, wherein the thyristor switch circuit further comprises:
and the first resistor is connected in parallel with two ends of the silicon controlled switch.
5. A zero-crossing control circuit as claimed in claim 1, wherein the current zero-crossing detection circuit comprises:
one end of the second resistor is electrically connected with the second end of the silicon controlled switch circuit, and the other end of the second resistor is electrically connected with the first input end of the controller;
the anode of the first diode is electrically connected with the other end of the second resistor and the first input end of the controller respectively, and the cathode of the first diode is electrically connected with the live wire;
one end of the third resistor is electrically connected with the cathode of the first diode, and the other end of the third resistor is respectively electrically connected with the other end of the second resistor and the first input end of the controller;
one end of the fourth resistor is electrically connected with the other end of the second resistor and the first input end of the controller respectively, and the other end of the fourth resistor is grounded; and
and the anode of the second diode is grounded, and the cathode of the second diode is respectively electrically connected with the other end of the second resistor and the first input end of the controller.
6. A zero-crossing control circuit as claimed in claim 1, further comprising:
and the current-limiting protection circuit is connected between the first output end of the controller and the control end of the silicon controlled switch circuit in series.
7. A zero-crossing control circuit as claimed in claim 6, wherein the current limiting protection circuit comprises:
and the fifth resistor is connected between the first output end of the controller and the control end of the silicon controlled switch circuit in series.
8. A zero-crossing control circuit as claimed in claim 1, further comprising:
and a first pin of the resistance-capacitance voltage reduction circuit is electrically connected with the first end of the silicon controlled switch circuit, the live wire and a third pin of the resistance-capacitance voltage reduction circuit respectively, a second pin of the resistance-capacitance voltage reduction circuit is electrically connected with the zero line, and a fourth pin of the resistance-capacitance voltage reduction circuit is grounded.
9. A zero-crossing control circuit as claimed in claim 1, further comprising:
and one end of the filter circuit is electrically connected with the first input end of the controller and the output end of the current zero-crossing detection circuit respectively, and the other end of the filter circuit is grounded.
10. An electronic device, characterized by comprising a zero-crossing control circuit as claimed in any one of claims 1 to 9; and
and the load is also electrically connected with the zero line.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110113037A (en) * | 2019-05-27 | 2019-08-09 | 深圳和而泰小家电智能科技有限公司 | Super-zero control circuit and electronic equipment |
| CN114184830A (en) * | 2021-11-01 | 2022-03-15 | 杭州涂鸦信息技术有限公司 | Zero-crossing detection circuit and electronic equipment |
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2019
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110113037A (en) * | 2019-05-27 | 2019-08-09 | 深圳和而泰小家电智能科技有限公司 | Super-zero control circuit and electronic equipment |
| CN110113037B (en) * | 2019-05-27 | 2024-07-02 | 深圳和而泰小家电智能科技有限公司 | Zero crossing control circuit and electronic equipment |
| CN114184830A (en) * | 2021-11-01 | 2022-03-15 | 杭州涂鸦信息技术有限公司 | Zero-crossing detection circuit and electronic equipment |
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