CN207541144U - Single-phase alternating current zero cross detection circuit based on light-coupled isolation - Google Patents
Single-phase alternating current zero cross detection circuit based on light-coupled isolation Download PDFInfo
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- CN207541144U CN207541144U CN201721613615.7U CN201721613615U CN207541144U CN 207541144 U CN207541144 U CN 207541144U CN 201721613615 U CN201721613615 U CN 201721613615U CN 207541144 U CN207541144 U CN 207541144U
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Abstract
The utility model provides a kind of single-phase alternating current zero cross detection circuit based on light-coupled isolation, including half-wave rectifying circuit, resistor voltage divider circuit, clamping diode circuit, capacitor filter, optocoupler termination power and switching transistor output circuit, wherein, the input terminal of the half-wave rectifying circuit connects single-phase alternating current L ends, the output terminal of the half-wave rectifying circuit is connect with the input terminal of the resistor voltage divider circuit, the output terminal of the resistor voltage divider circuit is connect with the input terminal of the clamping diode circuit, the output terminal of the clamping diode circuit is connect with the input terminal of the capacitor filter.The beneficial effects of the utility model are：It precisely can effectively detect pulsating direct current signal zero-crossing voltage, so as to reach the power of control system regulation motor, rotating speed or frequency purpose, voltage error is small, and synchronization dependability is high, precisely, safety.
Description
Technical field
The utility model is related to detection circuit more particularly to a kind of single-phase alternating current zero passage detection electricity based on light-coupled isolation
Road.
Background technology
At present, single-phase alternating current zero cross detection circuit is mostly from two phase lines（L or N）By electric resistance partial pressure, when waveform is from just
During half circumferential negative half period conversion, during by zero-bit, a fluctuating signal voltage is taken out.
Using single-phase alternating current zero cross detection circuit from two phase lines（L or N）The method realized by electric resistance partial pressure, electricity
Road is single, and detection fluctuating signal voltage error is larger, and synchronization dependability is poor, and there are the advanced worn-out end of zero crossing, effect is very not yet
Ideal, electric-control system and frequency-changing control system motor speed and frequency can not ensure.
Invention content
In order to solve the problems in the prior art, the utility model provides a kind of single-phase alternating current based on light-coupled isolation
Zero cross detection circuit.
The utility model provides a kind of single-phase alternating current zero cross detection circuit based on light-coupled isolation, including halfwave rectifier
Circuit, resistor voltage divider circuit, clamping diode circuit, capacitor filter, optocoupler termination power and switching transistor output electricity
Road, wherein, the input terminal of the half-wave rectifying circuit meets single-phase alternating current L ends, the output terminal of the half-wave rectifying circuit and institute
State the input terminal connection of resistor voltage divider circuit, the input of the output terminal of the resistor voltage divider circuit and the clamping diode circuit
End connection, the output terminal of the clamping diode circuit are connect with the input terminal of the capacitor filter, the capacitor filtering
The output terminal of circuit is connect with the input terminal of the optocoupler termination power, output terminal and the switch of the optocoupler termination power
Triode output circuit connects.
As further improvement of the utility model, the half-wave rectifying circuit includes diode D6, the diode D6
Anode connection single-phase alternating current L ends, the cathode of the diode D6 is connect with the input terminal of the resistor voltage divider circuit, described
Diode D6 is used for halfwave rectifier, forms pulsating direct current waveform voltage.
As further improvement of the utility model, the resistor voltage divider circuit includes resistance R3 and resistance R9, the light
Coupling termination power includes photoelectrical coupler IC1, and one end of the resistance R3 is connect with the cathode of the diode D6, the resistance
The other end of R3 is connect respectively with the pin 1 of the light emitting source of the photoelectrical coupler IC1, resistance R9, and the resistance R9's is another
End connection single-phase alternating current N-terminal, the resistor voltage divider circuit draw to the light emitting source of the photoelectrical coupler IC1 for dividing
Foot 1 provides operating bias voltage.
As further improvement of the utility model, the clamping diode circuit includes diode D7, the diode
The anode of D7 connects single-phase alternating current N-terminal, and the cathode of the diode D7 is connected to the hair of the resistance R3, photoelectrical coupler IC1
Between the pin 1 of light source, pulsating direct current waveform is selected on certain level by the diode D7, makes original signal rest part
Waveform shape remains unchanged.
As further improvement of the utility model, the capacitor filter includes filter capacitor C8, the filtered electrical
The one end for holding C8 is connected to single-phase alternating current N-terminal, and the other end of the filter capacitor C8 is connected to the resistance R3, photoelectric coupling
Between the pin 1 of the light emitting source of device IC1, the filter capacitor C8 is used for capacitor filtering, filters off radio-frequency component, forms DC pulse
Voltage waveform signal.
As further improvement of the utility model, the pin 1 of the light emitting source of the photoelectrical coupler IC1 is connected to single-phase
Alternating current N-terminal.
As further improvement of the utility model, the switching transistor output circuit includes switching transistor Q2, institute
The base stage for stating switching transistor Q2 is connect by resistance R8 with the pin 4 of the light-receiving device of the photoelectrical coupler IC1, the switch
The emitter ground connection of triode Q2, the collector of the switching transistor Q2 are connected separately with resistance R10, resistance R11, the light
Electric coupler IC1 is used for the isolation and transmission of DC pulse signal, and the photoelectrical coupler IC1 transmission DC pulse signal is opened
Close triode Q2, the conducting and cut-off of control switching transistor Q2.
As further improvement of the utility model, the pin 3 of the light-receiving device of the photoelectrical coupler IC1 is grounded, described
The other end of resistance R11 is zero passage detection port.
As further improvement of the utility model, the zero passage detection port is connected with microcontroller chip, the micro-control core
Piece detects the zero potential voltage of DC pulse moving voltage by judging.
The beneficial effects of the utility model are：It precisely can effectively detect pulsating direct current signal zero-crossing voltage, so as to
Reaching the power of control system regulation motor, rotating speed or frequency purpose, voltage error is small, and synchronization dependability is high, precisely, safety.
Description of the drawings
Fig. 1 is a kind of circuit diagram of the single-phase alternating current zero cross detection circuit based on light-coupled isolation of the utility model.
Specific embodiment
The utility model is described in further detail for explanation and specific embodiment below in conjunction with the accompanying drawings.
As shown in Figure 1, a kind of single-phase alternating current zero cross detection circuit based on light-coupled isolation, including half-wave rectifying circuit,
Resistor voltage divider circuit, clamping diode circuit, capacitor filter, optocoupler termination power and switching transistor output circuit,
In, the input terminal of the half-wave rectifying circuit connects single-phase alternating current L ends, the output terminal of the half-wave rectifying circuit and the resistance
The input terminal connection of bleeder circuit, the output terminal of the resistor voltage divider circuit and the input terminal of the clamping diode circuit connect
It connects, the output terminal of the clamping diode circuit is connect with the input terminal of the capacitor filter, the capacitor filter
Output terminal connect with the input terminal of the optocoupler termination power, the output terminal of the optocoupler termination power with it is described switch three poles
Pipe output circuit connects.
As shown in Figure 1, the half-wave rectifying circuit includes the anode connection single phase ac of diode D6, the diode D6
Electric L ends, the cathode of the diode D6 are connect with the input terminal of the resistor voltage divider circuit, and the diode D6 is whole for half-wave
Stream forms pulsation 50Hz DC waveform voltages.
As shown in Figure 1, the resistor voltage divider circuit includes resistance R3 and resistance R9, the optocoupler termination power includes photoelectricity
Coupler IC1, one end of the resistance R3 are connect with the cathode of the diode D6, the other end of the resistance R3 respectively with institute
State pin 1, the resistance R9 connections of the light emitting source of photoelectrical coupler IC1, the other end connection single-phase alternating current N of the resistance R9
End, the resistor voltage divider circuit provide operating bias for dividing, to the pin 1 of the light emitting source of the photoelectrical coupler IC1
Voltage.
As shown in Figure 1, the clamping diode circuit includes diode D7, the anode of the diode D7 connects single phase ac
Electric N-terminal, the cathode of the diode D7 be connected to the resistance R3, photoelectrical coupler IC1 light emitting source pin 1 between, institute
It states diode D7 pulsation 50Hz DC waveforms are selected on certain level, the waveform shape of original signal rest part is made to keep not
Become.
As shown in Figure 1, the capacitor filter includes filter capacitor C8, one end of the filter capacitor C8 is connected to list
Phase alternating current N-terminal, the other end of the filter capacitor C8 is connected to the resistance R3, the light emitting source of photoelectrical coupler IC1 draws
Between foot 1, the filter capacitor C8 is used for capacitor filtering, filters off radio-frequency component, forms DC pulse signal voltage waveform.
As shown in Figure 1, the pin 1 of the light emitting source of the photoelectrical coupler IC1 is connected to single-phase alternating current N-terminal.
As shown in Figure 1, the switching transistor output circuit includes switching transistor Q2, the base of the switching transistor Q2
Pole is connect by resistance R8 with the pin 4 of the light-receiving device of the photoelectrical coupler IC1, and the emitter of the switching transistor Q2 connects
Ground, the collector of the switching transistor Q2 are connected separately with resistance R10, resistance R11, the photoelectrical coupler IC1 for straight
The isolation and transmission of fluctuating signal are flowed, the photoelectrical coupler IC1 transmission DC pulse signal gives switching transistor Q2, and control is opened
Close the conducting and cut-off of triode Q2.
As shown in Figure 1, the pin 3 of the light-receiving device of the photoelectrical coupler IC1 is grounded, the other end of the resistance R11 is
Zero passage detection port.
As shown in Figure 1, the zero passage detection port is connected with microcontroller chip, for the microcontroller chip by judging, detection is straight
Flow the zero potential voltage of pulsating volage.
As shown in Figure 1, a kind of single-phase alternating current zero cross detection circuit based on light-coupled isolation provided by the invention, work
Principle is as follows：
1st, by half-wave rectifying circuit access single-phase alternating current L ends（220V）, halfwave rectifier is carried out by half-wave rectifying circuit,
Output ripple 50Hz DC waveform voltages are to resistor voltage divider circuit；
2nd, it is divided by resistor voltage divider circuit, it is inclined to provide operating point to the pin 1 of the light emitting source of photoelectrical coupler IC1
Put voltage；
3rd, pulsation 50Hz DC waveforms are selected on certain level by clamping diode circuit, make its remaining part of original signal
The waveform shape divided remains unchanged；
4th, capacitor filtering is carried out by capacitor filter, filters off radio-frequency component, form DC pulse signal voltage waveform；
5th, DC pulse signal is isolated and is transmitted by photoelectrical coupler IC1, it will be straight by photoelectrical coupler IC1
Stream fluctuating signal, which exports, gives switching transistor Q2, the conducting and cut-off of control switching transistor Q2；
6th, when DC pulse signal voltage is converted from negative half period to positive half cycle, switching transistor Q2 is connected and is operated in full
And state, a failing edge pulse signal voltage can be generated, reaches maximum value by 1/4 periodic signal voltage, at this point, micro-control
Chip（Microcontroller）Signal voltage is sampled in zero passage detection port, microcontroller chip（Microcontroller）By judging, detection is straight
Flow the zero potential voltage of pulsating volage.
A kind of single-phase alternating current zero cross detection circuit based on light-coupled isolation provided by the utility model, can detect electricity
The zero moment is pressed, and is supplied to microcontroller chip（Microcontroller）Zero-crossing pulse signal precisely can be detected effectively and calculate pulsation directly
Signal zero-crossing voltage is flowed, so as to reach the power of control system regulation motor, rotating speed or frequency purpose, voltage error is small, together
It is high to walk reliability, precisely, safety.
A kind of single-phase alternating current zero cross detection circuit based on light-coupled isolation provided by the utility model, it is stepless suitable for PG
The electric-control system of speed regulating motor or the rotating speed or frequency device of frequency-changing control system regulation motor.
The above content is combine specific preferred embodiment further detailed description of the utility model, it is impossible to
Assert that the specific implementation of the utility model is confined to these explanations.For the ordinary skill of the utility model technical field
For personnel, without departing from the concept of the premise utility, several simple deduction or replace can also be made, should all be regarded
To belong to the scope of protection of the utility model.
Claims (9)
1. a kind of single-phase alternating current zero cross detection circuit based on light-coupled isolation, it is characterised in that：Including half-wave rectifying circuit, electricity
Bleeder circuit, clamping diode circuit, capacitor filter, optocoupler termination power and switching transistor output circuit are hindered, wherein,
The input terminal of the half-wave rectifying circuit connects single-phase alternating current L ends, the output terminal of the half-wave rectifying circuit and the resistance point
The input terminal connection of volt circuit, the output terminal of the resistor voltage divider circuit are connect with the input terminal of the clamping diode circuit,
The output terminal of the clamping diode circuit is connect with the input terminal of the capacitor filter, the capacitor filter it is defeated
Outlet is connect with the input terminal of the optocoupler termination power, and the output terminal and the switching transistor of the optocoupler termination power are defeated
Go out circuit connection.
2. the single-phase alternating current zero cross detection circuit according to claim 1 based on light-coupled isolation, it is characterised in that：It is described
Half-wave rectifying circuit includes the anode connection single-phase alternating current L ends of diode D6, the diode D6, and the diode D6's is negative
Pole is connect with the input terminal of the resistor voltage divider circuit, and the diode D6 is used for halfwave rectifier, forms pulsating direct current waveform electricity
Pressure.
3. the single-phase alternating current zero cross detection circuit according to claim 2 based on light-coupled isolation, it is characterised in that：It is described
Resistor voltage divider circuit includes resistance R3 and resistance R9, and the optocoupler termination power includes photoelectrical coupler IC1, the resistance R3's
One end is connect with the cathode of the diode D6, and the other end of the resistance R3 is luminous with the photoelectrical coupler IC1 respectively
The pin 1 in source, resistance R9 connections, the other end connection single-phase alternating current N-terminal of the resistance R9, the resistor voltage divider circuit are used for
Partial pressure provides operating bias voltage to the pin 1 of the light emitting source of the photoelectrical coupler IC1.
4. the single-phase alternating current zero cross detection circuit according to claim 3 based on light-coupled isolation, it is characterised in that：It is described
The anode that clamping diode circuit includes diode D7, the diode D7 connects single-phase alternating current N-terminal, and the diode D7's is negative
Pole be connected to the resistance R3, photoelectrical coupler IC1 light emitting source pin 1 between, the diode D7 make original signal remaining
Partial waveform shape remains unchanged.
5. the single-phase alternating current zero cross detection circuit according to claim 3 based on light-coupled isolation, it is characterised in that：It is described
One end that capacitor filter includes filter capacitor C8, the filter capacitor C8 is connected to single-phase alternating current N-terminal, the filtered electrical
Hold C8 the other end be connected to the resistance R3, photoelectrical coupler IC1 light emitting source pin 1 between, the filter capacitor C8
For capacitor filtering, radio-frequency component is filtered off, forms DC pulse signal voltage waveform.
6. the single-phase alternating current zero cross detection circuit according to claim 3 based on light-coupled isolation, it is characterised in that：It is described
The pin 1 of the light emitting source of photoelectrical coupler IC1 is connected to single-phase alternating current N-terminal.
7. the single-phase alternating current zero cross detection circuit according to claim 3 based on light-coupled isolation, it is characterised in that：It is described
Switching transistor output circuit includes switching transistor Q2, and the base stage of the switching transistor Q2 passes through resistance R8 and the photoelectricity
The pin 4 of the light-receiving device of coupler IC1 connects, the emitter ground connection of the switching transistor Q2, the switching transistor Q2's
Collector is connected separately with the isolation and biography of resistance R10, resistance R11, the photoelectrical coupler IC1 for DC pulse signal
Defeated, the photoelectrical coupler IC1 transmission DC pulse signal gives switching transistor Q2, and the conducting of control switching transistor Q2 is with cutting
Only.
8. the single-phase alternating current zero cross detection circuit according to claim 7 based on light-coupled isolation, it is characterised in that：It is described
The pin 3 of the light-receiving device of photoelectrical coupler IC1 is grounded, and the other end of the resistance R11 is zero passage detection port.
9. the single-phase alternating current zero cross detection circuit according to claim 8 based on light-coupled isolation, it is characterised in that：It is described
Zero passage detection port is connected with microcontroller chip, and the microcontroller chip detects the zero potential electricity of DC pulse moving voltage by judging
Pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721613615.7U CN207541144U (en) | 2017-11-27 | 2017-11-27 | Single-phase alternating current zero cross detection circuit based on light-coupled isolation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721613615.7U CN207541144U (en) | 2017-11-27 | 2017-11-27 | Single-phase alternating current zero cross detection circuit based on light-coupled isolation |
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| Publication Number | Publication Date |
|---|---|
| CN207541144U true CN207541144U (en) | 2018-06-26 |
Family
ID=62615469
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721613615.7U Expired - Fee Related CN207541144U (en) | 2017-11-27 | 2017-11-27 | Single-phase alternating current zero cross detection circuit based on light-coupled isolation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107831357A (en) * | 2017-11-27 | 2018-03-23 | 深圳市锐钜科技有限公司 | Single-phase alternating current zero cross detection circuit and detection method based on light-coupled isolation |
| CN110729884A (en) * | 2019-10-09 | 2020-01-24 | 中国航空工业集团公司洛阳电光设备研究所 | Low-voltage switch control circuit |
-
2017
- 2017-11-27 CN CN201721613615.7U patent/CN207541144U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107831357A (en) * | 2017-11-27 | 2018-03-23 | 深圳市锐钜科技有限公司 | Single-phase alternating current zero cross detection circuit and detection method based on light-coupled isolation |
| CN110729884A (en) * | 2019-10-09 | 2020-01-24 | 中国航空工业集团公司洛阳电光设备研究所 | Low-voltage switch control circuit |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180626 Termination date: 20211127 |
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| CF01 | Termination of patent right due to non-payment of annual fee |