CN206339593U - Voltage zero-crossing detection circuit and household device - Google Patents
Voltage zero-crossing detection circuit and household device Download PDFInfo
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- CN206339593U CN206339593U CN201621464272.8U CN201621464272U CN206339593U CN 206339593 U CN206339593 U CN 206339593U CN 201621464272 U CN201621464272 U CN 201621464272U CN 206339593 U CN206339593 U CN 206339593U
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Abstract
The utility model is related to field of circuit technology, discloses a kind of voltage zero-crossing detection circuit and household device.The voltage zero-crossing detection circuit includes：Controller, the controller has zero passage detection end；Voltage zero-cross detection resistance, one end of the voltage zero-cross detection resistance is connected to AC power, and the other end is connected to above-mentioned zero passage detection end.By technical scheme provided by the utility model, voltage zero-cross detection just can be reliably achieved using negligible amounts and more cheap electronic component, with better simply circuit structure.
Description
Technical field
The utility model is related to field of circuit technology, in particular to voltage zero-crossing detection circuit and household device.
Background technology
Voltage zero-cross refers to that the voltage of AC signal is changed from just half circumferential negative half period conversion or from negative half period to positive half cycle
By zero-bit, the detection made by system.In electronic circuitry design, usually using voltage zero-cross as time reference, it is
The voltage zero-cross of AC signal is obtained with the mistakes zero-bit of synchronization zero-cross signal and AC signal, voltage zero-cross is thereby produced and examines
Slowdown monitoring circuit.
Existing voltage zero-crossing detection circuit, especially in family expenses cooking pot, generally requires using isolating transformer, compares
Zero crossing detection function is realized compared with the elements such as chip, optocoupler or triode and resistance, capacitor combination, it is more to there is number of elements, taken
PCB surface product is big, the shortcomings of BOM high costs.
Utility model content
The purpose of one side of the present utility model is to provide that a kind of number of elements is simple, with low cost and detection reliability is high
Voltage zero-crossing detection circuit, the purpose of another aspect of the present utility model is to provide a kind of detects electricity comprising above-mentioned voltage zero-cross
The household device on road；And implementation of the present utility model is to solve at least one technology illustrated in above-mentioned background technology
Problem.
To achieve these goals, on the one hand the utility model provides a kind of voltage zero-crossing detection circuit, including：
Controller, controller noted above has zero passage detection end；
Voltage zero-cross detection resistance, one end of above-mentioned voltage zero-cross detection resistance is connected to AC power, and the other end
It is connected to above-mentioned zero passage detection end.
Preferably, also include：Rectification module and voltage reduction module；And the input of above-mentioned rectification module is connected to alternating current
Source, above-mentioned rectification module is used to the ac high voltage of AC power changing into DC high voltage；The output of above-mentioned rectification module
End is connected to above-mentioned voltage reduction module, and above-mentioned voltage reduction module is used to above-mentioned DC high voltage changing into DC low-voltage；Above-mentioned control
Device processed is connected to the output end of above-mentioned voltage reduction module.
Preferably, also include：It is laid in the first clamp diode and the second clamp diode in controller noted above；And
The positive terminal of above-mentioned first clamp diode is connected to above-mentioned zero passage detection end, the negative pole end connection of above-mentioned first clamp diode
To the feeder ear of controller noted above；The positive terminal of above-mentioned second clamp diode is connected to the common of controller noted above, on
The negative pole end for stating the second clamp diode is connected to above-mentioned zero passage detection end.
Preferably, the port mode at above-mentioned zero passage detection end is arranged to floating high resistant input pattern.
Preferably, the quantity of above-mentioned voltage zero-cross detection resistance is one or more.
Preferably, the total resistance value of above-mentioned voltage zero-cross detection resistance is more than 50K ohm.
Preferably, the zero passage detection pattern at above-mentioned zero passage detection end is arranged to edge triggered interruption.
Preferably, above-mentioned edge triggered interruption includes following at least one：Rising edge triggering is interrupted, trailing edge triggering is interrupted
And rising and falling edges triggering is interrupted.
Preferably, above-mentioned voltage zero-cross detection resistance one end is connected to the zero line or zero line side of AC power.
Preferably, also include：Protection diode, one end of above-mentioned protection diode is connected to above-mentioned voltage zero-cross detection electricity
Between resistance and above-mentioned zero passage detection end, and the other end is connected to the feeder ear of controller noted above.
Preferably, also include：Electric capacity, one end of above-mentioned electric capacity is connected to above-mentioned voltage zero-cross detection resistance and above-mentioned zero passage
Between test side, and the other end is connected to the common of controller noted above.
On the other hand the utility model also provides a kind of household device, includes above-mentioned voltage zero-crossing detection circuit.
, can be using negligible amounts and more cheap electronic component, with better simply circuit by above-mentioned technical proposal
Structure just can be reliably achieved voltage zero-cross detection.
Other features and advantages of the utility model will be described in detail in subsequent embodiment part.
Brief description of the drawings
Accompanying drawing is to be further understood for providing to of the present utility model, and constitutes a part for specification, and following
Embodiment be used to explain the utility model together, but do not constitute to limitation of the present utility model.
Fig. 1 is illustrated that the structural representation of the voltage zero-crossing detection circuit of the embodiment of the utility model one；
A1-A2 waveforms in Fig. 2 be illustrated that in Fig. 1 the voltage at the two ends of AC power in voltage zero-crossing detection circuit with
The A1-GND waveforms in the oscillogram of time change, Fig. 2 are illustrated that in Fig. 1 AC power in voltage zero-crossing detection circuit
Zero-GND waveforms in the oscillogram that A1 ends are changed over time to the voltage between controller common GND ends, Fig. 2 are shown
Be in Fig. 1 in voltage zero-crossing detection circuit between zero passage detection port Zero and controller common the GND end of controller
The oscillogram that changes over time of voltage；
When Fig. 3 A are illustrated that the T1 stages of voltage zero-crossing detection circuit in Fig. 1 in fig. 2, in voltage zero-crossing detection circuit
Current direction schematic diagram；
When Fig. 3 B are illustrated that the T2 stages of voltage zero-crossing detection circuit in Fig. 1 in fig. 2, in voltage zero-crossing detection circuit
Current direction schematic diagram；
Fig. 4 is illustrated that the structural representation of the voltage zero-crossing detection circuit of another embodiment of the utility model.
Description of reference numerals
The voltage reduction module of 100 rectification module 200
The controller of 300 voltage zero-cross detection resistance 400
The zero passage detection port of A1, A2 ac power input end Zero controllers
GND controller common D1-D7 diodes
R1 voltage zero-cross detection resistance VCC controller feeder ears
C electric capacity
Embodiment
Embodiment of the present utility model is described in detail below in conjunction with accompanying drawing.It should be appreciated that herein
Described embodiment is merely to illustrate and explained the utility model, is not limited to the utility model.
Those skilled in the art of the present technique are appreciated that the wording " comprising " used in specification of the present utility model refers to deposit
In features described above, integer, step, operation, element and/or component, but it is not excluded that in the presence of or add it is one or more other
Feature, integer, step, operation, element, component and/or their group.It should be understood that when we claim element to be " connected " or " coupling
Connect " arrive another element when, it can be directly connected or coupled to other elements, or can also have intermediary element.In addition, this
In " connection " or " coupling " that uses wireless connection or wireless coupling can be included.Wording "and/or" used herein includes one
Individual or more the associated whole or any cell for listing item and all combinations.
The structural representation of the voltage zero-crossing detection circuit of the embodiment of the utility model one, the electricity are illustrated that referring to Fig. 1
Pressure zero cross detection circuit includes rectification module 100, voltage reduction module 200, controller 400 and Zenith tracking resistance 300, wherein
The input of rectification module 100 is connected to AC power, and the output end of rectification module 100 is connected to voltage reduction module 200, Yi Jiyu
The controller 400 that the output end of voltage reduction module 200 is connected.Wherein, controller 400 has zero passage detection end Zero, in control
It is the first clamp diode D5 and the second clamp diode D6 to have two the second clamp diodes in device 300, as shown in figure 1,
The negative pole end that D5 positive terminal is connected to zero passage detection end Zero, D5 is connected to the feeder ear VCC of controller 300；D6 positive pole
The common GND, D6 that are connected to controller 300 negative pole end is held to be connected to zero passage detection end Zero.Voltage zero-cross detection electricity
Resistance R1 one end is connected to the A1 ends of AC power, and its other end is connected to zero passage detection end Zero.
In order that the voltage zero-crossing detection circuit that the present embodiment is provided is easier to allow people to understand, below with reference to Fig. 2, figure
3A and Fig. 3 B are for a more detailed description to the operation principle of the voltage zero-crossing detection circuit.In the present embodiment, setting controller
Operating voltage is 5V, and controller zero passage detection triggering pattern is arranged to the Working mould interrupted with rising edge and trailing edge triggering
Formula, and alternating current input power supplying use civil power, and specification is 220V~50Hz, then the waveform between AC power incoming end A1-A2 is such as
Shown in Fig. 2 A1-A2 waveforms, wherein positive maximum voltage peak value is 310V, negative sense maximum voltage peak value is -310V.
When being illustrated that the time in fig. 2 is the T1 stage referring to Fig. 3 A, the current direction in voltage zero-crossing detection circuit
Ring, i.e.,：Electric current flows through voltage zero-cross detection resistance R1, the zero passage detection end Zero of controller, inside controller successively from A1 ends
Pull-up diode D5 positive poles, the feeder ear VCC of controller, the output end of voltage reduction module, the common GND of voltage reduction module,
Diode D4 positive poles, finally it flow to A2.In the present embodiment, the supply voltage VCC of controller 400 value is 5V, selected
Diode D4 and D5 forward voltage drop are 0.7V, then AC sine wave flow to zero passage detection port Zero via resistance R1 so that
Port Zero ceiling voltage is flow to by clamp diode D4 and the D5 clamper inside controller in 5.7V, port Zero voltage
Waveform is as shown in the T1 stages under the Zero-GND wave bands in Fig. 2.It is more than 0V in input ac voltage, during less than 5.7V, in Fig. 2
In shown T3, T4 stage, diode D5 cut-offs, now almost no electric current flows through R1, therefore the voltage difference at R1 two ends is 0,
The magnitude of voltage of port Zero in this stage is equal with the magnitude of voltage at A1 ends.
When in the T2 stages as shown in Figure 2, i.e., at the negative sense stage of the input ac voltage of AC power, this stage
Current direction ring in middle voltage zero-crossing detection circuit as shown in Figure 3 B, be specifically：Electric current flows through diode D2 successively from A2 ends
Positive pole, voltage reduction module input, voltage reduction module common, diode D3 positive poles, finally it flow to A1.Due in this stage,
There is no electric current to flow through R1, therefore the voltage difference at R1 two ends is 0V, then port Zero voltage is diode D3 pressure difference, i.e. ,-
0.7V, this stage port Zero voltage waveform as shown in the T2 stages in Zero-GND wave bands in Fig. 2, be maintained at it is fixed-
0.7V。
Referring to Zero-GND wave bands in Fig. 2, when mains voltage rises to 5.7V from 0V, i.e. T3 stages, due to control
The voltage zero-cross detection pattern of the detection circuit of device is equipped with rising edge down trigger pattern, when the setting rising trigger voltage
When being worth for 4V, then when the voltage of civil power rises to 4V from 0V, port Zero voltage also rises to 4V from 0V, so that trigger controller
Interrupt, therefore controller knows voltage over zero；Then, when the magnitude of voltage of AC power from 5.7V rises to 310V, then it is down to
During 5.7V, to be always held at 5.7V high level constant for port Zero magnitude of voltage in this stage, is interrupted without triggering；
Further, referring still to Zero-GND wave bands in Fig. 2, from 5.7V 0V is down in the magnitude of voltage of AC power, i.e.,
The T4 stages, because the voltage zero-cross detection pattern of the detection circuit of controller is equipped with trailing edge down trigger pattern, when setting
When the fixed decline trigger voltage value is 1V, then when the voltage of civil power is down to 1V from 5.7V, port Zero voltage is also from 5.7V
1V is down to, so that trigger controller is interrupted, therefore controller knows voltage over zero；Then, negative 310V is down to from 0V, then risen to
0V, i.e. T2 stages, now port Zero voltage is -0.7V, does not trigger interruption still now.
It can be seen from the description of above-described embodiment, only it can just be touched when mains voltage rises to 4V and drops to 1V
Controller zero passage is sent out to interrupt；But for crest voltage is 310V AC sine wave, this 4V and 1V voltage and reality
Closely, therefore controller can faithfully detect the zero crossing of voltage to zero-point voltage substantially, still can more preferably apply
In for voltage zero-cross accuracy of detection requirement less high voltage zero-cross measure loop.
It should be noted that above preferred embodiment is merely possible to example to illustrate the utility model preferably technical side
Case, should also be within protection domain of the present utility model as some modification and improvement of above-mentioned preferred embodiment
's.For example：Wherein, this should be also included in by only including the voltage zero-crossing detection circuit of controller and voltage zero-cross detection resistance
In the protection domain of utility model；Wherein, above-mentioned preferred embodiment is to raising and lowering edge triggered interruption pattern
It is exemplarily described, but it is understood that simple rising edge triggering interrupt mode or trailing edge triggering interrupt mode
The protection domain that the utility model is covered should all be belonged to；Wherein, voltage zero-cross detection resistance one end can be connected to alternating current
The zero line in source can also be zero line side；Wherein, the port Zero of the zero cross detection circuit in above-mentioned preferred embodiment port
Pattern can be arranged to without pull-up and without the floating high resistant input pattern of drop-down；Wherein, the electricity in above-mentioned preferred embodiment
The quantity for pressing through zero detection resistance is one or more, but it is to be noted that said one or multiple voltage zero-cross detection electricity
The resistance value of resistance should be greater than 50K ohm, because：Understood according to formula I=U/R when the resistance of zero passage detection resistance is bigger
The electric current for flowing through zero passage detection resistance is smaller, and the electric current for correspondingly flowing to zero passage detection end also will not be too high so as to ensure that zero passage is examined
Surveying controller chip will not be burned because electric current is too high.It is further preferred that resistance in this preferred embodiment can be with
It is one, the function thus, it is possible to realize the voltage zero-cross detection that loop just can be realized just with a resistance.
The structural representation of the voltage zero-crossing detection circuit of the embodiment of the utility model one is illustrated that referring to Fig. 4, by Fig. 4
Shown circuit connection is connected with the circuit shown in Fig. 1 to be compared, and is not difficult to know：Voltage zero-crossing detection circuit shown in Fig. 4
Diode D7 and electric capacity C are added compared to Fig. 1, above-mentioned implementation is can refer to for being connected in Fig. 4 with Fig. 1 identical circuit structures
The description of example, therefore not in this to go forth.As shown in figure 4, in diode D7 annexation, diode D7 is laid in control
The outside of device 400 processed, and diode D7 one end is connected to the zero passage detection port of zero passage detection resistance R1 and controller
Between Zero, diode D7 link position can increase the conveyance capacity of the voltage zero-crossing detection circuit, to improve this
The reliability of circuit；In electric capacity C annexation, electric capacity C is laid in the outside of controller 400, and the one of electric capacity C
End is connected between zero passage detection resistance R1 and the zero passage detection port Zero of controller, and the other end is connected to the public of controller
Ground terminal GND, electric capacity C link position can filter interference signal and smoothly flow to zero passage detection port Zero electric signal
Waveform, prevents that zero passage detection from, by false triggering, improving the antijamming capability of voltage zero-crossing detection circuit.
In another embodiment of the present utility model, the embodiment discloses a kind of household device, and the household device should
The voltage zero-crossing detection circuit illustrated with a upper embodiment；And thus had an advantageous effect in that in the present embodiment,
Due to rectification module, voltage reduction module, necessary to controller is household device, zero crossing detection function actually only more to be used
One resistive element, therefore can be realized with small number of electronic component, less pcb board area and relatively low cost in family expenses
Voltage zero-cross detection in cooking pot.
Preferred embodiment of the present utility model is described in detail above in association with accompanying drawing, still, the utility model is not limited
Detail in above-mentioned embodiment, can be to skill of the present utility model in range of the technology design of the present utility model
Art scheme carries out a variety of simple variants, and these simple variants belong to protection domain of the present utility model.
It is further to note that each particular technique feature described in above-mentioned embodiment, in not lance
In the case of shield, it can be combined by any suitable means in order to avoid unnecessary repetition, the utility model is to each
Possible combination is planted no longer separately to illustrate.
In addition, can also be combined between a variety of embodiments of the present utility model, as long as it is not disobeyed
Thought of the present utility model is carried on the back, it should equally be considered as content disclosed in the utility model.
Claims (12)
1. a kind of voltage zero-crossing detection circuit, it is characterised in that including：
Controller, the controller has zero passage detection end；
Voltage zero-cross detection resistance, one end of the voltage zero-cross detection resistance is connected to AC power, and other end connection
To the zero passage detection end.
2. voltage zero-crossing detection circuit according to claim 1, it is characterised in that also include：
Rectification module and voltage reduction module；And
The input of the rectification module is connected to AC power, and the rectification module is used for the ac high voltage of AC power
Change into DC high voltage；
The output end of the rectification module is connected to the voltage reduction module, and the voltage reduction module is used to turn the DC high voltage
It is melted into DC low-voltage；
The controller is connected to the output end of the voltage reduction module.
3. circuit according to claim 1 or 2, it is characterised in that also include：
Lay the first clamp diode and the second clamp diode in the controller；And
The positive terminal of first clamp diode is connected to the zero passage detection end, the negative pole end of first clamp diode
It is connected to the feeder ear of the controller；
The positive terminal of second clamp diode is connected to the common of the controller, second clamp diode
Negative pole end is connected to the zero passage detection end.
4. circuit according to claim 1 or 2, it is characterised in that the port mode at the zero passage detection end is arranged to
Floating high resistant input pattern.
5. circuit according to claim 1 or 2, it is characterised in that the quantity of the voltage zero-cross detection resistance is one
Or it is multiple.
6. circuit according to claim 5, it is characterised in that total resistance of the voltage zero-cross detection resistance is more than 50K
Ohm.
7. circuit according to claim 1 or 2, it is characterised in that the zero passage detection pattern at the zero passage detection end is set
It is set to edge triggered interruption.
8. circuit according to claim 7, it is characterised in that the edge triggered interruption includes following at least one：On
Liter is interrupted along triggering, trailing edge triggering interruption and rising and falling edges triggering are interrupted.
9. circuit according to claim 1 or 2, it is characterised in that described voltage zero-cross detection resistance one end connects best friend
Flow the zero line or zero line side of power supply.
10. circuit according to claim 3, it is characterised in that also include：
Protection diode, one end of the protection diode is connected to the voltage zero-cross detection resistance and the zero passage detection end
Between, and the other end is connected to the feeder ear of the controller.
11. circuit according to claim 3, it is characterised in that also include：
Electric capacity, one end of the electric capacity is connected between the voltage zero-cross detection resistance and the zero passage detection end, Yi Jiling
One end is connected to the common of the controller.
12. a kind of household device, includes the voltage zero-crossing detection circuit described in claim any one of 1-11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621464272.8U CN206339593U (en) | 2016-12-29 | 2016-12-29 | Voltage zero-crossing detection circuit and household device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621464272.8U CN206339593U (en) | 2016-12-29 | 2016-12-29 | Voltage zero-crossing detection circuit and household device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206339593U true CN206339593U (en) | 2017-07-18 |
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ID=59303200
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621464272.8U Active CN206339593U (en) | 2016-12-29 | 2016-12-29 | Voltage zero-crossing detection circuit and household device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206339593U (en) |
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2016
- 2016-12-29 CN CN201621464272.8U patent/CN206339593U/en active Active
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