WO2013044602A1 - Zero-crossing signal detection circuit - Google Patents

Zero-crossing signal detection circuit Download PDF

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Publication number
WO2013044602A1
WO2013044602A1 PCT/CN2012/070395 CN2012070395W WO2013044602A1 WO 2013044602 A1 WO2013044602 A1 WO 2013044602A1 CN 2012070395 W CN2012070395 W CN 2012070395W WO 2013044602 A1 WO2013044602 A1 WO 2013044602A1
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circuit
zero
resistor
crossing signal
diode
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PCT/CN2012/070395
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French (fr)
Chinese (zh)
Inventor
张健能
袁兴建
鹿红伟
吴民安
李宗怀
曹永平
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海信科龙电器股份有限公司
广东科龙空调器有限公司
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Publication of WO2013044602A1 publication Critical patent/WO2013044602A1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/175—Indicating the instants of passage of current or voltage through a given value, e.g. passage through zero

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  • the utility model belongs to the field of air conditioning detecting devices, and particularly relates to a zero-crossing signal detecting circuit.
  • the indoor unit cross flow fan generally uses a PG motor, and the PG
  • the driving of the motor is generally realized by the thyristor.
  • the commonly used thyristor in the air conditioning circuit belongs to the zero-crossing automatic shutdown type. The opening of the thyristor needs to input the current signal to the control pin, and the zero-crossing signal detection circuit is Input a current signal for the thyristor, find a reference point for its turn-on,
  • the zero-crossing signal circuit used in air conditioners is mainly based on resistor buck or power frequency transformer step-down sampling.
  • the resistor buck power consumption is large, while the power frequency transformer step-down requires a special transformer.
  • the power supply is not suitable.
  • the object of the present invention is to provide a zero-crossing signal detecting circuit with a simple structure and low power consumption of the circuit.
  • a zero-crossing signal detecting circuit comprises a zero-crossing signal detecting circuit, a signal converting circuit and a single-chip microcomputer which are sequentially connected, and the zero-crossing signal detecting circuit is further connected with a power frequency alternating current, and the zero-crossing signal detecting circuit comprises a resistor-capacitor step-down circuit and
  • the half-wave rectifying circuit includes a triode amplifying output circuit, and one end of the resistive-capacitor step-down circuit is connected with the power frequency alternating current, and the other end of the resistive-capacitor buck circuit is connected with the input end of the half-wave rectifying circuit, and the half-wave rectifying circuit is The output end is connected to the input end of the triode amplification output circuit, and the output end of the triode amplification output circuit is connected to the single chip as an output end of the zero-crossing signal.
  • the RC circuit includes a capacitor C1, a resistor R1 and a resistor R2, and one end of the capacitor C1 is connected to the power frequency AC, and the capacitor The other end of C1 is connected to one end of resistor R2, and the other end of resistor R2 is connected to the input of half-wave rectifier circuit, and resistor R1 is connected in parallel with capacitor C1.
  • the zero-crossing signal detecting circuit further includes a current limiting voltage dividing resistor, and an output end of the half-wave rectifying circuit is connected to an input end of the triode amplifying output circuit through a current limiting voltage dividing resistor.
  • the signal conversion circuit further includes an optocoupler communication circuit, and the input end of the triode amplification output circuit is connected to the current limiting voltage dividing resistor through the optocoupler communication circuit.
  • the optocoupler communication circuit includes an optocoupler B1 and a resistor R3.
  • the first end of the optocoupler B1 is connected to the current limiting resistor, and the optocoupler
  • the second end of the B1 is connected to the half-wave rectifying circuit
  • the third end of the optocoupler B1 is connected to the input end of the triode amplifier output circuit
  • the third end of the optocoupler B1 is also connected to the power ground through the resistor R3, the optocoupler B1
  • the fourth end is connected to the power source.
  • the power frequency alternating current is provided with a live line L and a neutral line N, and the fire L is connected to the resistor-capacitor step-down circuit, and the neutral line N Connected to a half-wave rectifier circuit.
  • the half-wave rectification circuit includes a diode V1, a diode V2, and a diode V3, and a fire line L
  • the anode of the diode V1 is also connected to the cathode of the diode V2 through the RC capacitor, and the cathode of the diode V1 is connected to the current limiting resistor, the neutral line N and the diode V2.
  • the anode is connected, the anode of diode V2 is also connected to the cathode of diode V3, and the anode of diode V3 is connected to the second end of optocoupler B1.
  • the triode amplification output circuit includes a triode V4, a resistor R4, a resistor R5, and a triode V4.
  • the base of the base is connected to the fourth end of the photocoupler B1 through the resistor R4, the emitter of the transistor V4 is connected to the power ground, and the collector of the transistor V4 is connected to the single chip as the output of the zero-crossing signal, the transistor V4 The collector is also connected to the power supply via resistor R5.
  • the utility model has the advantages of simple structure, reduces the power consumption of the circuit by using the resistance-resisting step-down circuit, has good energy saving effect and low cost.
  • Figure 1 is a schematic block diagram of the utility model
  • FIG. 2 is a circuit diagram of the present invention
  • Figure 3 is the zero-crossing signal output waveform of the present invention.
  • a zero-crossing signal detecting circuit comprises a power frequency alternating current and zero-crossing signal detecting circuit connected in sequence. , signal conversion circuit 2 , single chip 3 , zero - crossing signal detection circuit 1 including resistance-resistance step-down circuit 11 , half-wave rectifier circuit 12 and current limiting resistor 13 , signal conversion circuit 2
  • the transistor output circuit 21 and the optocoupler communication circuit 22 are included, and one end of the RC circuit 11 is connected to the power frequency AC, and the other end of the RC circuit 11 and the half wave rectification circuit 12
  • the input end is connected, the output end of the half-wave rectifying circuit 12 is connected to one end of the current limiting voltage dividing resistor 13, and the other end of the current limiting voltage dividing resistor 13 is connected to the input end of the optocoupler communication circuit 22, and the optocoupler communication circuit 22
  • the output terminal is connected to the input terminal of the transistor amplifying output circuit 21, and the output terminal of the triode amplifying output circuit 21 is connected
  • the power frequency AC power is set with the fire line L and the zero line N;
  • the RC circuit 11 includes a capacitor C1, a resistor R1 and a resistor R2;
  • the half-wave rectifier circuit 12 includes a diode V1, a diode V2, and a diode V3;
  • the optocoupler communication circuit 22 includes an optocoupler B1 and a third resistor R3.
  • the triode amplification output circuit 21 includes a triode V4, a resistor R4, and a resistor R5;
  • the capacitor C1 is connected to the power line L of the power frequency AC, and the other end of the capacitor C1 is connected to the resistor R2. Connected at one end, the other end of the resistor R2 is connected to the anode of the diode V1 of the half-wave rectifier circuit 12, and the resistor R1 is connected in parallel with the capacitor C1.
  • capacitor C1 is the capacitor step-down and resistor R1 is the capacitor. C1 discharge, resistor R2 prevents current surge.
  • the anode of the diode V1 is connected to the cathode of the diode V2, and the cathode of the diode V1 is connected to the current limiting resistor. 13 connection, diode V2 anode is connected to neutral line N, diode V2 anode is also connected to diode V3 cathode, diode V3 anode and optocoupler communication circuit 22 optocoupler B1 The second end of the connection.
  • the first end of the optocoupler B1 is connected to the current limiting voltage dividing resistor 13, and the second end of the optocoupler B1 and the half wave rectifying circuit
  • the anode of V3 is connected to the anode of V3.
  • the third end of the optocoupler B1 is connected to the transistor V4 through the resistor R4 of the triode amplifier output circuit 21.
  • the third end of the optocoupler B1 also passes through the resistor R3.
  • the fourth end of optocoupler B1 is connected to the power supply, which is +12 volts.
  • the base of the transistor V4 is connected to the fourth end of the photocoupler B1 through a resistor R4, and the transistor V4 The emitter is connected to the power ground.
  • the collector of the transistor V4 is connected to the microcontroller 3 as the output of the zero-crossing signal.
  • the collector of the transistor V4 is also connected to the power supply through the resistor R5.
  • the power supply is +5. Volt.
  • the current direction is as follows: L ⁇ C1 ⁇ R2 ⁇ V1 ⁇ 13 ⁇ B1 ⁇ V3 ⁇ N.
  • the optocoupler B1 is forwarded, and outputs a high level signal to the triode amplification output circuit 21, and the triode amplification output circuit 21 outputs a high level to the single chip microcomputer 3 .
  • the current direction is as follows: N ⁇ V2 ⁇ R2 ⁇ C1 ⁇ L.
  • Optocoupler B1 withstands the reverse voltage and does not conduct, outputs a low-level signal to the triode amplifier output circuit 21, and the triode amplifier output circuit 21 outputs a low level to the microcontroller 3 .
  • the power frequency AC waveform and the triode amplifier output circuit are tested for the actual use of the oscilloscope.
  • the waveform wherein the sine wave is a power frequency alternating current waveform, and the square wave is a waveform of the triode amplifying output circuit 21.
  • the voltage lags behind the current.
  • the detected zero-crossing signal is delayed by 5ms than the actual zero-crossing signal, and the high-level signal outputted to the MCU 3 is delayed by 5ms from the positive half cycle of the AC sine wave, and output to the MCU 3
  • the low level signal is delayed by 5ms from the negative half cycle of the AC sine wave.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

A zero-crossing signal detection circuit relates to the field of air conditioner detection devices, and comprises a zero-crossing signal detection circuit (1), a signal conversion circuit (2), and a single-chip machine (3) that are sequentially connected. The zero-crossing signal detection circuit (1) is further connected to a power frequency alternating current. The zero-crossing signal detection circuit (1) comprises a resistance-capacitance buck circuit (11) and a half-wave rectifying circuit (12). The signal conversion circuit (2) comprises a triode amplifier output circuit (21). One end of the resistance-capacitance buck circuit (11) is connected to the power frequency alternating current. The other end of the resistance-capacitance buck circuit (11) is connected to an input terminal of the half-wave rectifying circuit (12). An output terminal of the half-wave rectifying circuit (12) is connected to an input terminal of the triode amplifier output circuit (21). An output terminal of the triode amplifier output circuit (21) acts as an output terminal of zero-crossing signals, and is connected to the single-chip machine (3). The detection circuit has a simple structure, and the circuit has low power consumption.

Description

一种过零信号检测电路 Zero-crossing signal detection circuit
技术领域Technical field
本实用新型属于空调检测装置领域，具体涉及一种过零信号检测电路。The utility model belongs to the field of air conditioning detecting devices, and particularly relates to a zero-crossing signal detecting circuit.
背景技术Background technique
在空调控制的现有技术中，室内机贯流风扇一般采用 PG 电机，而 PG 电机的驱动一般通过可控硅来实现，空调电路中常用的可控硅是属于过零自动关断类型的，可控硅的开通需要对其控制引脚输入电流信号，过零信号检测电路就是为可控硅输入电流信号，为其开通找到基准点，In the prior art of air conditioning control, the indoor unit cross flow fan generally uses a PG motor, and the PG The driving of the motor is generally realized by the thyristor. The commonly used thyristor in the air conditioning circuit belongs to the zero-crossing automatic shutdown type. The opening of the thyristor needs to input the current signal to the control pin, and the zero-crossing signal detection circuit is Input a current signal for the thyristor, find a reference point for its turn-on,
目前在空调中大量使用的过零信号电路，主要以电阻降压或者工频变压器降压取样为主，电阻降压功耗较大，而工频变压器降压需要专门的变压器，对于高频开关电源不适合。At present, the zero-crossing signal circuit used in air conditioners is mainly based on resistor buck or power frequency transformer step-down sampling. The resistor buck power consumption is large, while the power frequency transformer step-down requires a special transformer. The power supply is not suitable.
实用新型内容Utility model content
针对现有技术的缺点，本实用新型的目的是提供一种结构简单，电路功耗低的过零信号检测电路。In view of the shortcomings of the prior art, the object of the present invention is to provide a zero-crossing signal detecting circuit with a simple structure and low power consumption of the circuit.
为实现上述目的，本实用新型的技术方案为：In order to achieve the above object, the technical solution of the present invention is:
一种过零信号检测电路，包括依次连接的过零信号检测电路、信号转换电路、单片机，过零信号检测电路还与工频交流电连接，所述过零信号检测电路包括阻容降压电路和半波整流电路，信号转换电路包括三极管放大输出电路，阻容降压电路的一端与工频交流电连接，阻容降压电路的另一端与半波整流电路的输入端连接，半波整流电路的输出端与三极管放大输出电路的输入端连接，三极管放大输出电路的输出端作为过零信号的输出端与单片机连接。A zero-crossing signal detecting circuit comprises a zero-crossing signal detecting circuit, a signal converting circuit and a single-chip microcomputer which are sequentially connected, and the zero-crossing signal detecting circuit is further connected with a power frequency alternating current, and the zero-crossing signal detecting circuit comprises a resistor-capacitor step-down circuit and The half-wave rectifying circuit includes a triode amplifying output circuit, and one end of the resistive-capacitor step-down circuit is connected with the power frequency alternating current, and the other end of the resistive-capacitor buck circuit is connected with the input end of the half-wave rectifying circuit, and the half-wave rectifying circuit is The output end is connected to the input end of the triode amplification output circuit, and the output end of the triode amplification output circuit is connected to the single chip as an output end of the zero-crossing signal.
上述方案中，阻容降压电路包括电容 C1 、电阻 R1 和电阻 R2 ，电容 C1 一端与工频交流电连接，电容 C1 另一端与电阻 R2 一端连接，电阻 R2 另一端与半波整流电路的输入端连接，电阻 R1 与电容 C1 并联。In the above solution, the RC circuit includes a capacitor C1, a resistor R1 and a resistor R2, and one end of the capacitor C1 is connected to the power frequency AC, and the capacitor The other end of C1 is connected to one end of resistor R2, and the other end of resistor R2 is connected to the input of half-wave rectifier circuit, and resistor R1 is connected in parallel with capacitor C1.
上述方案中，所述过零信号检测电路还包括限流分压电阻，半波整流电路的输出端通过限流分压电阻与三极管放大输出电路的输入端连接。In the above solution, the zero-crossing signal detecting circuit further includes a current limiting voltage dividing resistor, and an output end of the half-wave rectifying circuit is connected to an input end of the triode amplifying output circuit through a current limiting voltage dividing resistor.
上述方案中，所述信号转换电路还包括光耦通信电路，三极管放大输出电路的输入端通过光耦通信电路与限流分压电阻连接。In the above solution, the signal conversion circuit further includes an optocoupler communication circuit, and the input end of the triode amplification output circuit is connected to the current limiting voltage dividing resistor through the optocoupler communication circuit.
上述方案中，所述光耦通信电路包括光耦 B1 和电阻 R3 ，光耦 B1 的第一端与限流分压电阻连接，光耦 B1 的第二端与半波整流电路连接，光耦 B1 的第三端与三极管放大输出电路的输入端连接，光耦 B1 的第三端还通过电阻 R3 与电源地连接，光耦 B1 的第四端与电源连接。In the above solution, the optocoupler communication circuit includes an optocoupler B1 and a resistor R3. The first end of the optocoupler B1 is connected to the current limiting resistor, and the optocoupler The second end of the B1 is connected to the half-wave rectifying circuit, the third end of the optocoupler B1 is connected to the input end of the triode amplifier output circuit, and the third end of the optocoupler B1 is also connected to the power ground through the resistor R3, the optocoupler B1 The fourth end is connected to the power source.
上述方案中，所述工频交流电设置有火线 L 和零线 N ，火 L 与阻容降压电路连接，零线 N 与半波整流电路连接。In the above solution, the power frequency alternating current is provided with a live line L and a neutral line N, and the fire L is connected to the resistor-capacitor step-down circuit, and the neutral line N Connected to a half-wave rectifier circuit.
上述方案中，半波整流电路包括二极管 V1 、二极管 V2 和二极管 V3 ，火线 L 通过阻容降压电路与二极管 V1 的阳极连接，二极管 V1 的阳极还与二极管 V2 的阴极连接，二极管 V1 的阴极与限流分压电阻连接，零线 N 与二极管 V2 的阳极连接，二极管 V2 的阳极还与二极管 V3 的阴极连接，二极管 V3 的阳极与光耦 B1 的第二端连接。In the above scheme, the half-wave rectification circuit includes a diode V1, a diode V2, and a diode V3, and a fire line L The anode of the diode V1 is also connected to the cathode of the diode V2 through the RC capacitor, and the cathode of the diode V1 is connected to the current limiting resistor, the neutral line N and the diode V2. The anode is connected, the anode of diode V2 is also connected to the cathode of diode V3, and the anode of diode V3 is connected to the second end of optocoupler B1.
上述方案中，所述三极管放大输出电路包括三极管 V4 、电阻 R4 、电阻 R5 ，三极管 V4 的基极通过电阻 R4 与光耦 B1 的第四端连接，三极管 V4 的发射极与电源地连接，三极管 V4 的集电极作为过零信号的输出端与单片机连接，三极管 V4 的集电极还通过电阻 R5 与电源连接。In the above solution, the triode amplification output circuit includes a triode V4, a resistor R4, a resistor R5, and a triode V4. The base of the base is connected to the fourth end of the photocoupler B1 through the resistor R4, the emitter of the transistor V4 is connected to the power ground, and the collector of the transistor V4 is connected to the single chip as the output of the zero-crossing signal, the transistor V4 The collector is also connected to the power supply via resistor R5.
本实用新型的有益效果是：The beneficial effects of the utility model are:
本实用新型结构简单，利用阻容降压电路降低电路的功耗，节能效果好，成本低。The utility model has the advantages of simple structure, reduces the power consumption of the circuit by using the resistance-resisting step-down circuit, has good energy saving effect and low cost.
附图说明DRAWINGS
图 1 ：是本实用新型的原理框图；Figure 1: is a schematic block diagram of the utility model;
图 2 ：是本实用新型的电路图；Figure 2 is a circuit diagram of the present invention;
图 3 ：是本实用新型的过零信号输出波形。Figure 3 is the zero-crossing signal output waveform of the present invention.
具体实施方式detailed description
下面结合实施例及附图，对本实用新型作进一步地详细说明，但本实用新型的实施方式不限于此。The present invention will be further described in detail below with reference to the embodiments and drawings, but the embodiments of the present invention are not limited thereto.
本实用新型如图 1 所示，一种过零信号检测电路，包括依次连接的工频交流电、过零信号检测电路 1 、信号转换电路 2 、单片机 3 ，过零信号检测电路 1 包括阻容降压电路 11 、半波整流电路 12 和限流分压电阻 13 ，信号转换电路 2 包括三极管放大输出电路 21 和光耦通信电路 22 ，阻容降压电路 11 的一端与工频交流电连接，阻容降压电路 11 的另一端与半波整流电路 12 的输入端连接，半波整流电路 12 的输出端与限流分压电阻 13 的一端连接，限流分压电阻 13 的另一端与光耦通信电路 22 的输入端连接，光耦通信电路 22 的输出端与三极管放大输出电路 21 的输入端连接，三极管放大输出电路 21 的输出端作为过零信号的输出端与单片机 3 连接。The utility model is shown in Fig. 1. A zero-crossing signal detecting circuit comprises a power frequency alternating current and zero-crossing signal detecting circuit connected in sequence. , signal conversion circuit 2 , single chip 3 , zero - crossing signal detection circuit 1 including resistance-resistance step-down circuit 11 , half-wave rectifier circuit 12 and current limiting resistor 13 , signal conversion circuit 2 The transistor output circuit 21 and the optocoupler communication circuit 22 are included, and one end of the RC circuit 11 is connected to the power frequency AC, and the other end of the RC circuit 11 and the half wave rectification circuit 12 The input end is connected, the output end of the half-wave rectifying circuit 12 is connected to one end of the current limiting voltage dividing resistor 13, and the other end of the current limiting voltage dividing resistor 13 is connected to the input end of the optocoupler communication circuit 22, and the optocoupler communication circuit 22 The output terminal is connected to the input terminal of the transistor amplifying output circuit 21, and the output terminal of the triode amplifying output circuit 21 is connected to the single chip microcomputer 3 as an output terminal of the zero-crossing signal.
如图 2 所示，工频交流电设置有火线 L 和零线 N ；As shown in Figure 2, the power frequency AC power is set with the fire line L and the zero line N;
阻容降压电路 11 包括电容 C1 、电阻 R1 和电阻 R2 ；The RC circuit 11 includes a capacitor C1, a resistor R1 and a resistor R2;
半波整流电路 12 包括二极管 V1 、二极管 V2 和二极管 V3 ；The half-wave rectifier circuit 12 includes a diode V1, a diode V2, and a diode V3;
光耦通信电路 22 包括光耦 B1 和第三电阻 R3 。The optocoupler communication circuit 22 includes an optocoupler B1 and a third resistor R3.
三极管放大输出电路 21 包括三极管 V4 、电阻 R4 、电阻 R5 ；The triode amplification output circuit 21 includes a triode V4, a resistor R4, and a resistor R5;
阻容降压电路 11 中，电容 C1 一端与工频交流电的火线 L 连接，电容 C1 另一端与电阻 R2 一端连接，电阻 R2 另一端与半波整流电路 12 的二极管 V1 的阳极连接，电阻 R1 与电容 C1 并联。其中电容 C1 为电容降压，电阻 R1 为电容 C1 放电，电阻 R2 防止电流冲击。In the RC circuit, the capacitor C1 is connected to the power line L of the power frequency AC, and the other end of the capacitor C1 is connected to the resistor R2. Connected at one end, the other end of the resistor R2 is connected to the anode of the diode V1 of the half-wave rectifier circuit 12, and the resistor R1 is connected in parallel with the capacitor C1. Wherein capacitor C1 is the capacitor step-down and resistor R1 is the capacitor. C1 discharge, resistor R2 prevents current surge.
半波整流电路 12 中，二极管 V1 的阳极与二极管 V2 的阴极连接，二极管 V1 的阴极与限流分压电阻 13 连接，二极管 V2 的阳极与零线 N 连接，二极管 V2 的阳极还与二极管 V3 的阴极连接，二极管 V3 的阳极与光耦通信电路 22 中光耦 B1 的第二端连接。In the half-wave rectifying circuit 12, the anode of the diode V1 is connected to the cathode of the diode V2, and the cathode of the diode V1 is connected to the current limiting resistor. 13 connection, diode V2 anode is connected to neutral line N, diode V2 anode is also connected to diode V3 cathode, diode V3 anode and optocoupler communication circuit 22 optocoupler B1 The second end of the connection.
光耦通信电路 22 中，光耦 B1 的第一端与限流分压电阻 13 连接，光耦 B1 的第二端与半波整流电路 12 中的二极管 V3 的阳极连接，光耦 B1 的第三端通过三极管放大输出电路 21 的电阻 R4 与三极管 V4 连接，光耦 B1 的第三端还通过电阻 R3 与电源地连接，光耦 B1 的第四端与电源连接，该电源为 +12 伏。In the optocoupler communication circuit 22, the first end of the optocoupler B1 is connected to the current limiting voltage dividing resistor 13, and the second end of the optocoupler B1 and the half wave rectifying circuit The anode of V3 is connected to the anode of V3. The third end of the optocoupler B1 is connected to the transistor V4 through the resistor R4 of the triode amplifier output circuit 21. The third end of the optocoupler B1 also passes through the resistor R3. Connected to the power ground, the fourth end of optocoupler B1 is connected to the power supply, which is +12 volts.
三极管放大输出电路 21 中，三极管 V4 的基极通过电阻 R4 与光耦 B1 的第四端连接，三极管 V4 的发射极与电源地连接，三极管 V4 的集电极作为过零信号的输出端与单片机 3 连接，三极管 V4 的集电极还通过电阻 R5 与电源连接，该处电源为 +5 伏。In the transistor amplifying output circuit 21, the base of the transistor V4 is connected to the fourth end of the photocoupler B1 through a resistor R4, and the transistor V4 The emitter is connected to the power ground. The collector of the transistor V4 is connected to the microcontroller 3 as the output of the zero-crossing signal. The collector of the transistor V4 is also connected to the power supply through the resistor R5. The power supply is +5. Volt.
工作时，当工频交流电处于正弦波的正半周期时 , 电流方向如下： L → C1 → R2 → V1 → 13 → B1 → V3 → N 。此时光耦 B1 正向导通，输出高电平信号到三极管放大输出电路 21 ，三极管放大输出电路 21 输出高电平到单片机 3 。When working, when the power frequency AC is in the positive half cycle of the sine wave, the current direction is as follows: L → C1 → R2 → V1 → 13 → B1 → V3 → N. At this time, the optocoupler B1 is forwarded, and outputs a high level signal to the triode amplification output circuit 21, and the triode amplification output circuit 21 outputs a high level to the single chip microcomputer 3 .
当工频交流电处于正弦波的负半周期时，电流方向如下： N → V2 → R2 → C1 → L 。此时光耦 B1 承受反向电压不导通，输出低电平信号到三极管放大输出电路 21 ，三极管放大输出电路 21 输出低电平到单片机 3 。When the power frequency AC is in the negative half cycle of the sine wave, the current direction is as follows: N → V2 → R2 → C1 → L. Optocoupler B1 withstands the reverse voltage and does not conduct, outputs a low-level signal to the triode amplifier output circuit 21, and the triode amplifier output circuit 21 outputs a low level to the microcontroller 3 .
如图 2 所示，为实际使用示波器测试工频交流电波形与三极管放大输出电路 21 波形，其中正弦波为工频交流电波形，方波为三极管放大输出电路 21 的波形。当工频交流电通过电容 C1 时，电压要比电流滞后 90 度，因此检测出来的过零信号比实际的过零信号要延迟 5ms ，同样输出到单片机 3 的高电平信号比交流电正弦波的正半周期延迟 5ms ，输出到单片机 3 的低电平信号比交流电正弦波的负半周期延迟 5ms 。As shown in Figure 2, the power frequency AC waveform and the triode amplifier output circuit are tested for the actual use of the oscilloscope. The waveform, wherein the sine wave is a power frequency alternating current waveform, and the square wave is a waveform of the triode amplifying output circuit 21. When power frequency AC power passes through capacitor C1, the voltage lags behind the current. Degree, so the detected zero-crossing signal is delayed by 5ms than the actual zero-crossing signal, and the high-level signal outputted to the MCU 3 is delayed by 5ms from the positive half cycle of the AC sine wave, and output to the MCU 3 The low level signal is delayed by 5ms from the negative half cycle of the AC sine wave.

Claims (8)

  1. 一种过零信号检测电路，包括依次连接的过零信号检测电路 (1) 、信号转换电路 (2) 、单片机（ 3 ），过零信号检测电路 (1) 还与工频交流电连接，其特征在于，所述过零信号检测电路 (1) 包括阻容降压电路 (11) 和半波整流电路（ 12 ），信号转换电路 (2) 包括三极管放大输出电路（ 21 ），阻容降压电路 (11) 的一端与工频交流电连接，阻容降压电路 (11) 的另一端与半波整流电路 (12) 的输入端连接，半波整流电路 (12) 的输出端与三极管放大输出电路 (21) 的输入端连接，三极管放大输出电路 (21) 的输出端作为过零信号的输出端与单片机（ 3 ）连接。A zero-crossing signal detecting circuit includes a zero-crossing signal detecting circuit (1), a signal converting circuit (2), and a single-chip microcomputer (3) The zero-crossing signal detecting circuit (1) is also connected to the commercial frequency alternating current, characterized in that the zero-crossing signal detecting circuit (1) includes a resistor-capacitor step-down circuit (11) and a half-wave rectifier circuit (12). The signal conversion circuit (2) includes a triode amplification output circuit (21), one end of the RC circuit (11) is connected to the power frequency AC, and the other end of the RC circuit (11) and the half wave rectification circuit are connected. The input terminal of (12) is connected, the output end of the half-wave rectifying circuit (12) is connected to the input end of the triode amplifying output circuit (21), and the triode is amplifying the output circuit (21) The output is connected to the microcontroller (3) as an output of the zero-crossing signal.
  2. 根据权利要求 1 所述的过零信号检测电路，其特征在于，阻容降压电路 (11) 包括电容 C1 、电阻 R1 和电阻 R2 ，电容 C1 一端与工频交流电连接，电容 C1 另一端与电阻 R2 一端连接，电阻 R2 另一端与半波整流电路 (12) 的输入端连接，电阻 R1 与电容 C1 并联。The zero-crossing signal detecting circuit according to claim 1, wherein the RC circuit (11) comprises a capacitor C1, a resistor R1 and a resistor. R2, one end of the capacitor C1 is connected to the power frequency AC, the other end of the capacitor C1 is connected to one end of the resistor R2, and the other end of the resistor R2 is connected to the input end of the half-wave rectifying circuit (12), the resistor R1 Parallel to capacitor C1.
  3. 根据权利要求 2 所述的过零信号检测电路，其特征在于，所述过零信号检测电路 (1) 还包括限流分压电阻（ 13 ），半波整流电路 (12) 的输出端通过限流分压电阻（ 13 ）与三极管放大输出电路 (21) 的输入端连接。The zero-crossing signal detecting circuit according to claim 2, wherein said zero-crossing signal detecting circuit (1) further comprises a current limiting resistor (13) The output of the half-wave rectifying circuit (12) is connected to the input terminal of the triode amplifier output circuit (21) through a current limiting resistor (13).
  4. 根据权利要求 3 所述的过零信号检测电路，其特征在于，所述信号转换电路（ 2 ）还包括光耦通信电路 (22) ，三极管放大输出电路 (21) 的输入端通过光耦通信电路 (22) 与限流分压电阻 (13) 连接。The zero-crossing signal detecting circuit according to claim 3, wherein said signal conversion circuit (2) further comprises an optocoupler communication circuit (22) The input end of the triode amplification output circuit (21) is connected to the current limiting resistor (13) through an optocoupler communication circuit (22).
  5. 根据权利要求 4 所述的过零信号检测电路，其特征在于，所述光耦通信电路 (22) 包括光耦 B1 和电阻 R3 ，光耦 B1 的第一端与限流分压电阻 (13) 连接，光耦 B1 的第二端与半波整流电路（ 12 ）连接，光耦 B1 的第三端与三极管放大输出电路（ 21 ）的输入端连接，光耦 B1 的第三端还通过电阻 R3 与电源地连接，光耦 B1 的第四端与电源连接。The zero-crossing signal detecting circuit according to claim 4, wherein said optocoupler communication circuit (22) comprises an optocoupler B1 and a resistor R3, and an optocoupler The first end of B1 is connected to the current limiting resistor (13), the second end of the optocoupler B1 is connected to the half-wave rectifying circuit (12), and the third end of the optocoupler B1 is connected to the triode amplifier output circuit (21) The input end of the optocoupler B1 is also connected to the power ground via a resistor R3, and the fourth end of the optocoupler B1 is connected to the power source.
  6. 根据权利要求 5 所述的过零信号检测电路，其特征在于，所述工频交流电设置有火线 L 和零线 N ，火 L 与阻容降压电路 (11) 连接，零线 N 与半波整流电路 (12) 连接。The zero-crossing signal detecting circuit according to claim 5, wherein said power frequency alternating current is provided with a fire line L and a zero line N, fire L Connected to the RC circuit (11), the neutral N is connected to the half-wave rectification circuit (12).
  7. 根据权利要求 6 所述的过零信号检测电路，其特征在于，半波整流电路 (12) 包括二极管 V1 、二极管 V2 和二极管 V3 ，火线 L 通过阻容降压电路 (11) 与二极管 V1 的阳极连接，二极管 V1 的阳极还与二极管 V2 的阴极连接，二极管 V1 的阴极与限流分压电阻 (13) 连接，零线 N 与二极管 V2 的阳极连接，二极管 V2 的阳极还与二极管 V3 的阴极连接，二极管 V3 的阳极与光耦 B1 的第二端连接。The zero-crossing signal detecting circuit according to claim 6, wherein the half-wave rectifying circuit (12) comprises a diode V1 and a diode V2. And diode V3, the live line L is connected to the anode of the diode V1 through the RC circuit (11), and the anode of the diode V1 is also connected to the cathode of the diode V2, the diode V1 The cathode is connected to the current limiting resistor (13), the neutral N is connected to the anode of the diode V2, the anode of the diode V2 is also connected to the cathode of the diode V3, and the anode of the diode V3 is coupled to the photocoupler B1. The second end of the connection.
  8. 根据权利要求 7 所述的过零信号检测电路，其特征在于，所述三极管放大输出电路 (21) 包括三极管 V4 、电阻 R4 、电阻 R5 ，三极管 V4 的基极通过电阻 R4 与光耦 B1 的第四端连接，三极管 V4 的发射极与电源地连接，三极管 V4 的集电极作为过零信号的输出端与单片机（ 3 ）连接，三极管 V4 的集电极还通过电阻 R5 与电源连接。The zero-crossing signal detecting circuit according to claim 7, wherein said transistor amplifying output circuit (21) comprises a triode V4 and a resistor R4. , the resistor R5, the base of the transistor V4 is connected to the fourth end of the photocoupler B1 through the resistor R4, and the emitter of the transistor V4 is connected to the power ground, the transistor V4 The collector is connected to the microcontroller (3) as the output of the zero-crossing signal, and the collector of the transistor V4 is also connected to the power supply via the resistor R5.
PCT/CN2012/070395 2011-09-30 2012-01-16 Zero-crossing signal detection circuit WO2013044602A1 (en)

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CN103743940A (en) * 2014-01-24 2014-04-23 镇江天力变压器有限公司 Precise zero cross detection circuit for resonance current of high-frequency dedusting power supply
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CN108988830A (en) * 2018-08-03 2018-12-11 中国电子科技集团公司第二十四研究所 A kind of pulse signal generation circuit of programmable edge time
CN110043502A (en) * 2019-05-28 2019-07-23 深圳市泛邦通用科技有限公司 Ceiling fan and its controller
CN110043502B (en) * 2019-05-28 2024-04-12 深圳市泛邦通用科技有限公司 Ceiling fan and controller thereof
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
CN115407118A (en) * 2022-09-03 2022-11-29 迈思普电子股份有限公司 AC zero-crossing detection circuit for isolated output square wave

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