CN114184830A - Zero-crossing detection circuit and electronic equipment - Google Patents
Zero-crossing detection circuit and electronic equipment Download PDFInfo
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- CN114184830A CN114184830A CN202111282964.6A CN202111282964A CN114184830A CN 114184830 A CN114184830 A CN 114184830A CN 202111282964 A CN202111282964 A CN 202111282964A CN 114184830 A CN114184830 A CN 114184830A
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Abstract
The application provides a zero-crossing detection circuit and electronic equipment. The zero-crossing sampling circuit is connected with the alternating current input end; the switch enabling circuit is connected with the zero-crossing sampling circuit and the alternating current input end; the signal processing circuit is connected with the zero-crossing sampling circuit and the switch enabling circuit; the signal processing circuit is used for controlling the switch enabling circuit to be switched off when the zero-crossing sampling circuit acquires a zero-crossing signal so as to control the zero-crossing sampling circuit to pause working, and outputting an enabling signal after a preset time period so as to control the switch enabling circuit to be switched on so as to control the zero-crossing sampling circuit to acquire the zero-crossing signal next time. The zero-crossing detection circuit can reduce the technical problem that the power consumption is too high when the detection circuit works.
Description
Technical Field
The application relates to the technical field of electronic and electrical control, in particular to a zero-crossing detection circuit and electronic equipment.
Background
With the progress of electronic technology and the increasing demand of people for product intelligence, more and more intelligent hardware appears in the production life of people. Meanwhile, products with high efficiency and low energy consumption are more and more favored by consumers. In these products, ac zero crossing point detection sampling is often required, for example, the multiple power-on and power-off of intelligent bulbs and lamps triggers the distribution network and the switch application of turning off the lamps without power-off, such as intelligent switches, dimming on-off devices, electric heaters, solid state relays, and the like.
Disclosure of Invention
The technical problem that this application mainly solved provides a zero cross detection circuit and electronic equipment, the too high technical problem of zero cross detection circuit during operation consumption that can be fine solution.
In order to solve the above technical problem, one technical solution adopted by the present application is to provide a zero-cross detection circuit, which includes a zero-cross sampling circuit, a switch enable circuit, and a signal processing circuit. The zero-crossing sampling circuit is connected with the alternating current input end; the switch enabling circuit is connected with the zero-crossing sampling circuit and the alternating current input end; the signal processing circuit is connected with the zero-crossing sampling circuit and the switch enabling circuit. The signal processing circuit is used for controlling the switch enabling circuit to be switched off when the zero-crossing sampling circuit acquires a zero-crossing signal so as to control the zero-crossing sampling circuit to pause working, and outputting an enabling signal after a preset time period so as to control the switch enabling circuit to be switched on so as to control the zero-crossing sampling circuit to acquire the zero-crossing signal next time.
In order to solve the above technical problem, another technical solution adopted by the present application is to provide an electronic device, which includes a zero-crossing detection circuit for detecting and sampling an alternating-current zero-crossing point.
The beneficial effect of this application: the signal processing circuit is connected with the zero-crossing sampling circuit and the switch enabling circuit, and the alternating current input end is connected with the zero-crossing sampling circuit and the switch enabling circuit. Through the connection mode, when the signal processing circuit controls the switch enabling circuit to be disconnected, the zero-crossing sampling circuit stops working; when the signal processing circuit controls the switch enabling circuit to be closed, the signal output by the zero-crossing sampling circuit is a square wave signal with the frequency synchronous with the input alternating current signal, and the rising edge and the falling edge of the square wave signal are synchronous with the zero crossing point of the alternating current signal; the signal processing circuit receives the zero-crossing signal, controls the switch enabling circuit to be disconnected, stops the zero-crossing sampling circuit from working, outputs the enabling signal after a preset time period to control the switch enabling circuit to be closed, and controls the zero-crossing sampling circuit to carry out the next zero-crossing signal acquisition. After the zero-crossing signal is acquired by the zero-crossing sampling circuit, the sampling work of the preset time is stopped by the zero-crossing sampling circuit, so that the power consumption of the zero-crossing detection circuit is effectively reduced by the zero-crossing detection circuit by reducing the working time of the zero-crossing sampling circuit, and the technical problem that the power consumption of the zero-crossing detection circuit is overhigh is solved. Furthermore, the zero-crossing sampling circuit outputs an alternating-current zero-crossing signal at the output end, the working time in the period of alternating current is short, the interference of external signals can be effectively filtered, and the accuracy of the zero-crossing signal is ensured.
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. Wherein:
FIG. 1 is a block diagram illustrating the structure of an embodiment of a zero crossing detection circuit according to the present application;
FIG. 2 is a circuit diagram of an embodiment of a zero crossing detection circuit of the present application;
FIG. 3 is a graph of the input signal versus the output signal of the zero crossing detection circuit of the present application;
FIG. 4 is a block diagram showing the structure of another embodiment of the zero crossing detection circuit of the present application;
FIG. 5 is a circuit diagram of an embodiment of a zero-cross sampling circuit according to the present application;
FIG. 6 is a circuit schematic diagram of a second embodiment of a zero-cross sampling circuit according to the present application;
FIG. 7 is a schematic circuit diagram of a zero-cross sampling circuit according to an embodiment of the present application;
FIG. 8 is a circuit diagram of an embodiment of a switch enable circuit of the present application;
fig. 9 is a schematic structural diagram of an embodiment of an electronic device according to the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive work according to the embodiments of the present application are within the scope of the present application.
Referring to fig. 1 and fig. 2, fig. 1 is a schematic block diagram of a structure of an embodiment of a zero-crossing detection circuit 10 of the present application, and fig. 2 is a schematic circuit diagram of the embodiment of the zero-crossing detection circuit 10 of the present application. The zero-cross detection circuit 10 in this embodiment includes a zero-cross sampling circuit 100, a switch enable circuit 200, and a signal processing circuit 300. The zero-crossing sampling circuit 100 is connected with an alternating current input end; the switch enabling circuit 200 is connected with the zero-crossing sampling circuit 100 and the alternating current input end; the signal processing circuit 300 connects the zero-cross sampling circuit 100 and the switch enable circuit 200. The signal processing circuit 300 is configured to, when the zero-cross sampling circuit 100 acquires a zero-cross signal, control the switch enabling circuit 200 to be turned off to control the zero-cross sampling circuit 100 to suspend operation, and output an enabling signal after a preset time period to control the switch enabling circuit 200 to be turned on to control the zero-cross sampling circuit 100 to perform the next zero-cross signal acquisition.
The signal processing circuit 300 is connected to the zero-cross sampling circuit 100 and the switch enable circuit 200, and the ac input terminal is connected to the zero-cross sampling circuit 100 and the switch enable circuit 200. Through the above connection manner, referring to fig. 2, when the signal processing circuit 300 controls the switch enabling circuit 200 to be disconnected, the zero-cross sampling circuit 100 suspends the operation; when the signal processing circuit 300 controls the switch enabling circuit 200 to be closed, the signal output by the zero-crossing sampling circuit 100 is a square wave signal with the frequency synchronous with the input alternating current signal, and the rising edge and the falling edge of the square wave signal are synchronous with the zero crossing point of the alternating current signal, on the basis, the signal processing circuit 300 controls the switch enabling circuit 200 to be closed at a certain moment before the input alternating current signal is in the zero crossing point, controls the zero-crossing sampling circuit 100 to start working, acquires the zero-crossing signal, and outputs the zero-crossing signal to the signal processing circuit 300; the signal processing circuit 300 receives the zero-crossing signal, controls the switch enabling circuit 200 to be disconnected, stops the zero-crossing sampling circuit 100 from working, outputs an enabling signal after a preset time period, controls the switch enabling circuit 200 to be closed, and controls the zero-crossing sampling circuit 100 to perform the next zero-crossing signal acquisition. After the zero-crossing signal is acquired by the zero-crossing sampling circuit 100, the zero-crossing sampling circuit 100 stops sampling within a preset time, so that the zero-crossing detection circuit 10 effectively reduces the power consumption of the zero-crossing detection circuit 10 by reducing the working time of the zero-crossing sampling circuit 100, and the technical problem that the power consumption of the zero-crossing detection circuit 10 is overhigh is solved. Further, the zero-crossing sampling circuit 100 outputs an alternating-current zero-crossing signal at the output end, the working time in the period of alternating current is short, the interference of external signals can be effectively filtered, and the accuracy of the zero-crossing signal is ensured.
Referring to fig. 3, the ac input may optionally include a live input L and a neutral input N. A first input end of the zero-crossing sampling circuit 100 is connected with a live wire input end L, a first output end of the switch enabling circuit 200 is connected with a second input end of the zero-crossing sampling circuit 100, and a second output end of the switch enabling circuit 200 is connected with a zero line input end N; the output end of the zero-cross sampling circuit 100 is connected to the signal processing circuit 300, and the input end of the switch enabling circuit 200 is connected to the signal processing circuit 300.
Through the above connection mode, the signal processing circuit 300 can output an enable signal to control the switch enable circuit 200, thereby controlling the ac voltage to be input into the zero-cross sampling circuit 100 and simultaneously controlling the working state of the zero-cross sampling circuit 100.
Optionally, the preset time period is less than the period of the ac signal input from the ac input terminal.
The input alternating current is divided into a positive half cycle and a negative half cycle, so that when the alternating current goes from the positive half cycle to the negative half cycle, a zero point is passed once, and when the alternating current goes from the negative half cycle to the positive half cycle, a zero point is passed once again, so that in one working cycle of the alternating current, the zero-crossing sampling circuit 100 can detect zero-point signals twice when the alternating current works in the whole alternating current cycle. In order to reduce the power consumption of the zero-crossing detection circuit 10, when the signal processing circuit 300 detects the output zero-crossing signal, the output enable signal controls the switch enable circuit 200 to pause for a preset time, so as to control the zero-crossing sampling circuit 100 to pause for a preset time, thereby reducing the power consumption of the zero-crossing detection circuit 10. The preset time may be set according to the frequency of the desired zero-crossing signal, for example, when the period of the ac signal is time T and the desired zero-crossing signal is acquired once in a half period, the preset time may be set to a time less than 1/2T, such as 1/5T, 2/5T, etc.; when the required zero-crossing signal is acquired once for one period, the preset time may also be set to be greater than 1/2T time and less than T time, such as 4/5T, 9/10T, etc.
For different applications, the signal processing circuit 300 may output different ac zero-crossing signals by controlling the zero-crossing sampling circuit 100, and may also meet the requirements of different power consumptions by controlling a preset time period. If the standby power consumption is required to be low in the application of the single-live-wire silicon controlled phase-cut dimming circuit, otherwise, the phenomenon of 'ghost fire' caused by turning off the lamp is easy to occur, the zero-crossing sampling circuit 100 can stop working through the signal processing circuit 300 during standby, and therefore the standby power consumption of the application is reduced; zero-point signals need to be stable and reliable in the dimming process, the zero-crossing signal sampling work of the zero-crossing sampling circuit 100 is short, the preset time period is in a closed state, external interference can be avoided, hardware filtering of input alternating current signals can be achieved, and the stable zero-point signals are provided for application.
The working principle of the zero-crossing sampling circuit 100 can be derived, and the zero-crossing sampling circuit 100 can be composed of an operational amplifier circuit or a voltage comparator, a resistor and a triode, or a resistor and an optocoupler.
Referring to fig. 4, the zero-cross sampling circuit 100 includes a first switch K11 and a second switch K12. A first pin of the first switch K11 is used as a first input end of the zero-cross sampling circuit 100, a second pin of the first switch K11 is used as a second input end of the zero-cross sampling circuit 100, a third pin of the first switch K11 is connected with a first end of a first resistor R11, a second end of the first resistor R11 is grounded GNG, and a fourth pin of the first switch K11 is connected with a reference voltage VCC end; wherein the first switch K11 is configured to: the on/off between the third pin and the fourth pin of the first switch K11 is determined by the direction of current flow between the first pin and the second pin of the first switch K11.
A first pin and a second pin of the first switch K11 are respectively used as a first input terminal and a second input terminal of the zero-cross sampling circuit 100, a third pin thereof is connected to a first end of the first resistor R11, a second end of the first resistor R11 is grounded to GNG, and a fourth pin of the first switch K11 is connected to a reference voltage VCC terminal. Through the connection manner, when the current flowing through the first switch K11 flows from the first pin of the first switch K11 to the second pin of the first switch K11, the third pin of the first switch K11 and the fourth pin of the first switch K11 are turned on, that is, the first switch K11 is turned on, and the loop where the first switch K11 and the first resistor R11 are located is turned on; when the current flowing through the first switch K11 flows from the second pin of the first switch K11 to the first pin of the first switch K11, the third pin of the first switch K11 and the fourth pin of the first switch K11 are turned off, that is, the first switch K11 is turned off, and the loop formed by the first switch K11 and the first resistor R11 is turned off.
A control pin of the second switch K12 is connected to a third pin of the first switch K11, a first pin of the second switch K12 is connected to a reference voltage VCC terminal, and serves as an output terminal of the zero-cross sampling circuit 100, and is connected to the input terminal of the signal processing circuit 300, and a second pin of the second switch K12 is grounded GNG; wherein the second switch K12 is configured to: the on/off state between the first pin and the second pin of the second switch K12 is determined by the direction of voltage bias between the control pin and the second pin of the second switch K12.
The control pin of the second switch K12 is connected to the third pin of the first switch K11, the first pin thereof is connected to the VCC terminal and serves as the output terminal of the zero-cross sampling circuit 100, and the second pin thereof is connected to the ground GNG. As can be seen from the above connection manner and the operating state of the first switch K11, when the first switch K11 is turned on, the loop where the first switch K11 and the first resistor R11 are located is turned on, so that there is a bias voltage between the control pin of the second switch K12 and the second pin of the second switch K12, the second switch K12 is turned on, and at the same time, the voltage output from the second end of the first resistor R11 pulls down the voltage of the first pin of the second switch K12, and the voltage at this point is a low voltage with respect to the reference voltage VCC, it can be understood that the output end of the zero-cross sampling circuit 100 outputs a low-level signal; when the first switch K11 is turned off, the loop where the first switch K11 and the first resistor R11 are located is turned off, and there is no bias voltage between the control pin of the second switch K12 and the second pin of the second switch K12, that is, the second switch K12 is turned off, so that the voltage of the first pin of the second switch K12 is the same as the reference voltage VCC, which can be understood as that the output terminal of the zero-cross sampling circuit 100 outputs a high level signal. Referring to fig. 5, the zero-cross sampling circuit 100 further includes a second resistor R12, a third resistor R13, and a capacitor C11. The first end of the second resistor R12 is connected to the reference voltage VCC terminal, and the second end of the second resistor R12 is connected to the first pin of the second switch K12.
The first end of the third resistor R13 is connected to the third pin of the first switch K11, and the second end of the third resistor R13 is connected to the control pin of the second switch K12.
A first end of the capacitor C11 is connected to a first pin of the second switch K12, and a second end of the capacitor C11 is connected to a second pin of the second switch K12.
Optionally, the first switch K11 includes a first light emitting diode and a phototransistor. The anode of the first light emitting diode is used as a first pin of the first switch K11, and the cathode of the first light emitting diode is used as a second pin of the first switch K11.
The emitter of the phototransistor serves as the third pin of the first switch K11, and the collector of the phototransistor serves as the fourth pin of the first switch K11.
The second switch K12 comprises an NPN transistor. The base of the NPN type triode is used as the control pin of the second switch K12, the collector of the NPN type triode is used as the first pin of the second switch K12, and the emitter of the NPN type triode is used as the second pin of the second switch K12.
The first switch K11 includes a first light emitting diode and a phototransistor, and the second switch K12 includes an NPN type transistor. When the current flowing through the light-emitting diode flows from the positive electrode to the negative electrode, the light-emitting diode is conducted to emit light, the phototriode is conducted, a bias voltage is formed between the base electrode and the collector electrode of the NPN triode, the NPN triode is also conducted, and a low-level signal is output at the emitter electrode of the NPN triode; when the current flowing through the light-emitting diode flows from the negative electrode to the positive electrode, the light-emitting diode is cut off, the photosensitive triode is conducted, no bias voltage exists between the base electrode and the collector electrode of the NPN triode, the NPN triode is also cut off, and meanwhile, a high-level signal is output at the emitter electrode of the NPN triode.
The signal processing circuit 300 outputs an enable signal to control the enable switch circuit 200 to work, the zero-cross sampling circuit 100 inputs the positive half cycle of alternating current, the light emitting diode of the first switch K11 is conducted, the phototriode is triggered and conducted, the base voltage of the second switch K12, namely the NPN triode, is biased in the forward direction, the second switch K12 is conducted, and the zero-cross sampling circuit 100 outputs a low level signal; when the positive half-cycle alternating current is converted into the negative half-cycle alternating current and passes through the zero point, the light emitting diode of the first switch K11 is not turned on, that is, the first switch K11 is turned off, the corresponding second switch K12 is turned off, and the zero-crossing sampling circuit 100 outputs a high-level signal. When the signal processing circuit 300 detects that the input zero-crossing signal jumps from the high level to the low level, the enable signal may be output to control the switch enable circuit 200 to pause for a preset time, that is, the zero-crossing sampling circuit 100 is controlled to pause for a preset time, and after the preset time, the enable signal is output to control the switch enable circuit 200, so as to start the zero-crossing sampling circuit 100 to perform the next zero-point sampling operation.
Referring to fig. 6, the zero-cross sampling circuit 100 optionally further includes a rectifier diode D11. The anode of the rectifier diode D11 is connected to the second input terminal of the zero-cross sampling circuit 100, and the cathode of the rectifier diode D11 is connected to the first output terminal of the switch enable circuit 200.
The anode of the rectifying diode D11 is connected to the second input terminal of the zero-cross sampling circuit 100, and the cathode thereof is connected to the first output terminal of the switch enable circuit 200. When the positive half cycle of the alternating current is input into the zero-crossing sampling circuit 100, the first switch K11 is conducted, the rectifier diode D11 is conducted and rectifies the alternating current, meanwhile, the enabling switch circuit 200 is conducted with a loop of the zero-crossing sampling circuit 100, and the zero-crossing sampling circuit 100 conducts zero-point sampling work on the alternating current; when the negative half cycle of the alternating current is input into the zero-cross sampling circuit 100, the first switch K11 is turned off, the rectifier diode D11 is also turned off, and the loop of the zero-cross sampling circuit 100 and the switch enabling circuit 200 is turned off. When the rectifier diode D11 is cut off, the external interference caused by the negative half cycle of the alternating current can be reduced, and the effective detection rate of the zero-crossing signal is improved.
Referring to fig. 7, the switch enable circuit 200 includes a third switch K23. The first pin of the third switch K23 is used as the input terminal of the switch enable circuit 200 and is connected to the output terminal of the signal processing circuit 300, the second pin of the third switch K23 is grounded GNG, the third pin of the third switch K23 is used as the second output terminal of the switch enable circuit 200, and the fourth pin of the third switch K23 is used as the first output terminal of the switch enable circuit 200. Wherein the third switch K23 is configured to: the on/off between the third pin and the fourth pin of the third switch K23 is determined by the voltage bias direction between the first pin and the second pin of the third switch K23.
The first pin of the third switch K23 is used as the input terminal of the switch enable circuit 200, connected to the output terminal of the signal processing circuit 300, and has the second pin grounded to GNG, the third pin is used as the second output terminal of the switch enable circuit 200, and the fourth pin is used as the first output terminal of the switch enable circuit 200. Through the above connection manner, when the signal processing circuit 300 outputs a high level signal, a forward bias voltage is formed between the first pin and the second pin of the third switch K23, and the third pin and the fourth pin of the third switch K23 are turned on, that is, the third switch K23 is turned on; when the signal processing circuit 300 outputs a low-level signal, a reverse bias voltage is formed between the first pin and the second pin of the third switch K23, and the third pin and the fourth pin of the third switch K23 are turned off, that is, the third switch K23 is turned off.
Optionally, the third switch K23 includes a second light emitting diode and a triac. The anode of the second led is used as the first pin of the third switch K23, and the cathode of the second led is used as the second pin of the third switch K23.
The first terminal of the triac is used as the third pin of the third switch K23, and the second terminal of the triac is used as the fourth pin of the third switch K23.
The third switch K23 includes a second light emitting diode and a triac, when the signal processing circuit 300 outputs a high level signal, the light emitting diode is turned on to emit light, and the triac is turned on, that is, the third switch K23 is turned on, so that the zero-cross sampling circuit 100 can be controlled to start sampling; when the signal processing circuit 300 outputs a low level signal, the light emitting diode is turned off, the triac is turned off, that is, the third switch K23 is turned off, and the zero-crossing sampling circuit 100 can be controlled to stop sampling.
As can be understood from the working principle of the switch enable circuit 200, the switch enable circuit 200 may also be formed by a switching transistor, a MOS transistor, or a one-way or two-way thyristor.
Referring to fig. 9, the present application further provides an electronic device 20, which includes the zero-crossing detection circuit 10 provided in the above embodiments, for ac zero-crossing detection.
The electronic device 20 may be an intelligent light bulb, a refrigerator, a blower, or other electronic devices that require zero-cross detection, and the present embodiment does not limit the type of the electronic device 20.
The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.
Claims (10)
1. A zero-crossing detection circuit, characterized in that the zero-crossing detection circuit comprises:
the zero-crossing sampling circuit is connected with the alternating current input end;
the switch enabling circuit is connected with the zero-crossing sampling circuit and the alternating current input end;
the signal processing circuit is connected with the zero-crossing sampling circuit and the switch enabling circuit;
the signal processing circuit is used for controlling the switch enabling circuit to be switched off when the zero-crossing sampling circuit acquires a zero-crossing signal so as to control the zero-crossing sampling circuit to pause working, and outputting an enabling signal after a preset time period so as to control the switch enabling circuit to be switched on so as to control the zero-crossing sampling circuit to acquire the zero-crossing signal next time.
2. A zero-crossing detection circuit as claimed in claim 1,
the alternating current input end comprises a live wire input end and a zero line input end;
the first input end of the zero-crossing sampling circuit is connected with the live wire input end, the first output end of the switch enabling circuit is connected with the second input end of the zero-crossing sampling circuit, and the second output end of the switch enabling circuit is connected with the zero line input end;
the output end of the zero-crossing sampling circuit is connected with the signal processing circuit, and the input end of the switch enabling circuit is connected with the signal processing circuit.
3. A zero-crossing detection circuit as claimed in claim 2,
the zero-cross sampling circuit includes:
a first pin of the first switch is used as a first input end of the zero-crossing sampling circuit, a second pin of the first switch is used as a second input end of the zero-crossing sampling circuit, a third pin of the first switch is connected with a first end of a first resistor, a second end of the first resistor is grounded, and a fourth pin of the first switch is connected with a reference voltage end; wherein the first switch is configured to: the on/off between the third pin and the fourth pin of the first switch is determined by the current direction between the first pin and the second pin of the first switch;
a control pin of the second switch is connected with a third pin of the first switch, a first pin of the second switch is connected with the reference voltage end and serves as an output end of the zero-crossing sampling circuit and is connected with an input end of the signal processing circuit, and a second pin of the second switch is grounded; wherein the second switch is configured to: the on/off state between the first pin and the second pin of the second switch is determined by the voltage bias direction between the control pin and the second pin of the second switch.
4. A zero-crossing detection circuit as claimed in claim 3,
the zero-cross sampling circuit further comprises:
a first end of the second resistor is connected with the reference voltage end, and a second end of the second resistor is connected with a first pin of the second switch;
a first end of the third resistor is connected with a third pin of the first switch, and a second end of the third resistor is connected with a control pin of the second switch;
and the first end of the capacitor is connected with the first pin of the second switch, and the second end of the capacitor is connected with the second pin of the second switch.
5. A zero-crossing detection circuit as claimed in claim 4,
the first switch includes:
the anode of the first light-emitting diode is used as a first pin of the first switch, and the cathode of the first light-emitting diode is used as a second pin of the first switch;
the emitter of the phototriode is used as a third pin of the first switch, and the collector of the phototriode is used as a fourth pin of the first switch;
the second switch includes:
and a base electrode of the NPN type triode is used as a control pin of the second switch, a collector electrode of the NPN type triode is used as a first pin of the second switch, and an emitter electrode of the NPN type triode is used as a second pin of the second switch.
6. A zero-crossing detection circuit as claimed in claim 2,
the switch enable circuit includes:
a first pin of the third switch is used as an input end of the switch enabling circuit and is connected with an output end of the signal processing circuit, a second pin of the third switch is grounded, a third pin of the third switch is used as a second output end of the switch enabling circuit, and a fourth pin of the third switch is used as a first output end of the switch enabling circuit; wherein the third switch is configured to: the on/off between the third pin and the fourth pin of the third switch is determined by a voltage bias direction between the first pin and the second pin of the third switch.
7. A zero-crossing detection circuit as claimed in claim 6,
the third switch includes:
the anode of the second light emitting diode is used as a first pin of the third switch, and the cathode of the second light emitting diode is used as a second pin of the third switch;
and the first end of the bidirectional controllable silicon switch is used as a third pin of the third switch, and the second end of the bidirectional controllable silicon switch is used as a fourth pin of the third switch.
8. A zero-crossing detection circuit as claimed in claim 2,
the zero-cross sampling circuit further comprises:
and the anode of the rectifier diode is connected with the second input end of the zero-crossing sampling circuit, and the cathode of the rectifier diode is connected with the first output end of the switch enabling circuit.
9. A zero-crossing detection circuit as claimed in claim 1,
the preset time period is less than the period of the alternating current signal input by the alternating current input end.
10. An electronic device comprising the zero-cross detection circuit of any one of claims 1 to 9 for alternating current zero-cross detection sampling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111282964.6A CN114184830A (en) | 2021-11-01 | 2021-11-01 | Zero-crossing detection circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111282964.6A CN114184830A (en) | 2021-11-01 | 2021-11-01 | Zero-crossing detection circuit and electronic equipment |
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| CN114184830A true CN114184830A (en) | 2022-03-15 |
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| CN202111282964.6A Pending CN114184830A (en) | 2021-11-01 | 2021-11-01 | Zero-crossing detection circuit and electronic equipment |
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| CN (1) | CN114184830A (en) |
Cited By (1)
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| CN114859779A (en) * | 2022-04-20 | 2022-08-05 | 浙江亚尚智能科技有限公司 | Gradually-cooling gradually-heating blower air control system |
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