CN207339234U - A kind of contactor protective device and alternating-current charging pile - Google Patents
A kind of contactor protective device and alternating-current charging pile Download PDFInfo
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- CN207339234U CN207339234U CN201721204858.5U CN201721204858U CN207339234U CN 207339234 U CN207339234 U CN 207339234U CN 201721204858 U CN201721204858 U CN 201721204858U CN 207339234 U CN207339234 U CN 207339234U
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Abstract
The utility model discloses a kind of contactor protective device and alternating-current charging pile, including zero cross detection circuit, control circuit, contactor drive circuit and contactor；Zero cross detection circuit includes photoelectrical coupler, pull-up resistor and power module；First input end of the first end of light emitting diode in photoelectrical coupler as zero cross detection circuit, the second input terminal of the second end of light emitting diode as zero cross detection circuit；The first end of light-receiving device in photoelectrical coupler is connected with the first end of pull-up resistor, output terminal of its common port as zero cross detection circuit, and the second end ground connection of light-receiving device, the second end of pull-up resistor is connected with the output terminal of power module.Core devices of the utility model using photoelectrical coupler as zero cross detection circuit, to realize the detection to current zero-crossing point.Photoelectrical coupler cost in zero cross detection circuit provided by the utility model is low, detects and controls relatively simple, reliability height.
Description
Technical field
Contactor actuation techniques field is the utility model is related to, is filled more particularly to a kind of contactor protective device and exchange
Electric stake.
Background technology
With the development of contactor actuation techniques, the application of contactor is more and more extensive.Contactor is a kind of automatic switch
Element, it includes coil and contact, and magnetic field can be produced when coil flows through electric current, and making contact action, (normally-closed contact disconnects, often
Open contact closure), to achieve the purpose that control load.If touching for contactor is closed or disconnected at the time of electric current is bigger
Point, can have damage to contact.In the prior art, contact is damaged in order to prevent, and contactor protective device includes zero cross detection circuit
And control circuit, the current zero-crossing point of the current signal for detecting the output of the AC power in alternating-current charging pile, to control
Circuit controls contact closure or disconnection in current zero-crossing point.In the prior art by AD (Analog-to-Digital, simulation-number
Word) core devices of the converter as zero cross detection circuit, but a/d converter is of high cost, and its internal algorithm is complicated, reliability
It is low.
Therefore, how to provide a kind of scheme for solving above-mentioned technical problem is that those skilled in the art needs to solve at present
The problem of.
Utility model content
The purpose of this utility model is to provide a kind of contactor protective device and includes the exchange of the contactor protective device
Charging pile, the contactor protective device include zero cross detection circuit, and the photoelectrical coupler cost in the zero cross detection circuit is low, inspection
Survey and control is simpler, reliability is high.
In order to solve the above technical problems, the utility model provides a kind of contactor protective device, including zero passage detection electricity
Road, control circuit, contactor drive circuit and contactor；Wherein, the first input end and alternating current of the zero cross detection circuit
The firewire in source is connected, and the second input terminal of the zero cross detection circuit is connected with the zero curve of the AC power, the zero passage inspection
The output terminal of slowdown monitoring circuit is connected by the control circuit with the contactor drive circuit, the contactor drive circuit also with
The input terminal of the contactor is connected；
The zero cross detection circuit includes photoelectrical coupler, pull-up resistor and power module；Wherein, the photoelectrical coupler
In light emitting diode first input end of the first end as the zero cross detection circuit, the second end of the light emitting diode
The second input terminal as the zero cross detection circuit；The first end of light-receiving device in the photoelectrical coupler and the pull-up electricity
The first end of resistance is connected, output terminal of its common port as the zero cross detection circuit, the second end ground connection of the light-receiving device, institute
The second end for stating pull-up resistor is connected with the output terminal of the power module, wherein, the current direction when light-receiving device turns on
To flow to the second end of the light-receiving device by the first end of the light-receiving device.
Preferably, first end of the cathode of the light emitting diode as the light emitting diode, the light emitting diode
Second end of the anode as the light emitting diode.
Preferably, first end of the anode of the light emitting diode as the light emitting diode, the light emitting diode
Second end of the cathode as the light emitting diode.
Preferably, the light-receiving device is phototriode, and the collector of the phototriode is as the light-receiving device
First end, the second end of the emitter of the phototriode as the light-receiving device.
Preferably, the zero cross detection circuit further includes the first current limliting module and the second current limliting module, wherein：
The first end of the first current limliting module is connected with the firewire of the AC power, and the of the first current limliting module
Two ends are connected with the anode of the light emitting diode, the first end of the second current limliting module and the zero curve phase of the AC power
Even, the second end of the second current limliting module is connected with the cathode of the light emitting diode.
Preferably, the first current limliting module and the second current limliting module include the resistance of N number of series connection, wherein, N is
Integer not less than 1.
Preferably, the zero cross detection circuit further includes diode, and the cathode of the diode is limited with described first respectively
The second end of flow module is connected with the anode of the light emitting diode, the anode of the diode respectively with the second current limliting mould
The second end of block is connected with the cathode of the light emitting diode.
Preferably, the zero cross detection circuit further includes filter circuit, and the filter circuit includes the first capacitance and first
Resistance；Wherein：
The first end of first capacitance is connected with the first end of the first resistor, its common port is respectively with described first
The second end of current limliting module, the cathode of the diode are connected with the anode of the light emitting diode, and the of first capacitance
Two ends are connected with the second end of the first resistor, its common port second end with the second current limliting module, described two respectively
The anode of pole pipe is connected with the cathode of the light emitting diode.
Preferably, the contactor drive circuit is phase inverter.
In order to solve the above technical problems, the utility model additionally provides a kind of alternating-current charging pile, including any of the above-described kind connects
Tentaculum protective device.
The utility model provides a kind of contactor protective device, including zero cross detection circuit, control circuit, contactor drive
Dynamic circuit and contactor；The first input end of zero cross detection circuit is connected with the firewire of AC power, and the of zero cross detection circuit
Two input terminals are connected with the zero curve of AC power, and the output terminal of zero cross detection circuit passes through control circuit and contactor drive circuit
It is connected, contactor drive circuit is also connected with the input terminal of contactor；Zero cross detection circuit includes photoelectrical coupler, pull-up resistor
And power module；First input end of the first end of light emitting diode in photoelectrical coupler as zero cross detection circuit, shines
Second input terminal of the second end of diode as zero cross detection circuit；The first end and pull-up of light-receiving device in photoelectrical coupler
The first end of resistance is connected, output terminal of its common port as zero cross detection circuit, the second end ground connection of light-receiving device, pull-up resistor
Second end be connected with the output terminal of power module, light-receiving device turn on when current direction be by light-receiving device first end flow direction by
The second end of light device.
With in the prior art using a/d converter compared with the core devices of zero cross detection circuit, the utility model is by photoelectricity
Core devices of the coupler as zero cross detection circuit, when the current signal of AC power output is transformed into negative signal by positive signal
Or when by negative signal being transformed into positive signal, the working status of photoelectrical coupler can change accordingly so that zero passage detection
The output signal of circuit changes accordingly, it is achieved thereby that the detection to current zero-crossing point.Mistake provided by the utility model
Photoelectrical coupler cost in zero detection circuit is low, detects and controls relatively simple, reliability height.
The utility model additionally provides a kind of alternating-current charging pile, has identical beneficial effect with above-mentioned contactor protective device
Fruit.
Brief description of the drawings
, below will be to the prior art and embodiment in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
Needed in attached drawing be briefly described, it should be apparent that, drawings in the following description are only the utility model
Some embodiments, for those of ordinary skill in the art, without creative efforts, can also be according to this
A little attached drawings obtain other attached drawings.
Fig. 1 is a kind of structure diagram of contactor protective device provided by the utility model；
Fig. 2 is the structure diagram of another contactor protective device provided by the utility model.
Embodiment
The core of the utility model is to provide a kind of contactor protective device and includes the exchange of the contactor protective device
Charging pile, the contactor protective device include zero cross detection circuit, and the photoelectrical coupler cost in the zero cross detection circuit is low, inspection
Survey and control is simpler, reliability is high.
It is new below in conjunction with this practicality to make the purpose, technical scheme and advantage of the utility model embodiment clearer
Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched
The embodiment stated is the utility model part of the embodiment, instead of all the embodiments.Based on the implementation in the utility model
Example, those of ordinary skill in the art's all other embodiments obtained without making creative work, belongs to
The scope of the utility model protection.
Fig. 1 is refer to, Fig. 1 is a kind of structure diagram of contactor protective device provided by the utility model.
Contactor protective device includes zero cross detection circuit 1, control circuit 2, contactor drive circuit 3 and contactor 4；Its
In, the first input end of zero cross detection circuit 1 is connected with the firewire of AC power 5, the second input terminal of zero cross detection circuit 1 with
The zero curve of AC power 5 is connected, and the output terminal of zero cross detection circuit 1 is connected by control circuit 2 with contactor drive circuit 3,
Input terminal of the contactor drive circuit 3 also with contactor 4 is connected；
Zero cross detection circuit 1 includes photoelectrical coupler 11, pull-up resistor R and power module 12；Wherein, photoelectrical coupler 11
In light emitting diode D first input end of the first end as zero cross detection circuit 1, the second end conduct of light emitting diode D
Second input terminal of zero cross detection circuit 1；The first end of light-receiving device Q in photoelectrical coupler 11 and the first end of pull-up resistor R
It is connected, output terminal of its common port as zero cross detection circuit 1, the second end ground connection of light-receiving device Q, the second end of pull-up resistor R
It is connected with the output terminal of power module 12, wherein, current direction when light-receiving device Q is turned on is to be flowed to by the first end of light-receiving device Q
The second end of light-receiving device Q.
Specifically, zero cross detection circuit 1 is used for after the zero cross signal of current signal of the output of AC power 5 is detected；
Control circuit 2 is used to, according to the zero cross signal received, generate control signal, is driven so as to control contactor drive circuit 3
Closure or the disconnection accordingly of contactor 4.
Photoelectrical coupler 11, pull-up resistor R and the power module 12 that the detection function of zero cross detection circuit 1 is contained by it are complete
Into.Wherein, photoelectrical coupler 11 includes light emitting diode D and light-receiving device Q, when photoelectrical coupler 11 works, light emitting diode D
In the conduction state, optical signal can be transformed into by flowing through the current signal of light emitting diode D, and light-receiving device Q at this time can receive light letter
Number, and since light sensitive effect converts optical signals into current signal, the direction that flows through of current signal is the first end by light-receiving device Q
Flow to the second end of light-receiving device Q.When photoelectrical coupler 11 does not work, light emitting diode D is in cut-off state, then light-receiving device Q
It is also at cut-off state.
Specifically, the current signal that AC power 5 exports is transformed into negative signal by positive signal or is transformed into by negative signal
During positive signal, the corresponding on or off of light emitting diode D can be made.When light emitting diode D is turned on, light-receiving device Q can be received
The optical signal of light emitting diode D is simultaneously converted into current signal, light-receiving device Q is also at conducting state, that is to say, that at this time
Light-receiving device Q equivalent to one closure switch, then power module 12 and pull-up resistor R are in channel status, pull-up at this time
Resistance R has electric current by the first end of, pull-up resistor R equivalent to ground connection, namely zero cross detection circuit 1 output terminal equivalent to connecing
Ground, exports low level.
When light emitting diode D ends, light-receiving device Q at this time is also at cut-off state, that is to say, that light-receiving device at this time
Q equivalent to one disconnection switch, then power module 12 and pull-up resistor R be in off state, due to pull-up resistor R at this time
There is no electric current by so the output terminal of zero cross detection circuit 1 exports high level equivalent to being directly connected with power module 12.
As it can be seen that during the low and high level checker that zero cross detection circuit 1 exports, low and high level corresponds to when converting
Rising edge where at the time of or trailing edge where at the time of accordingly for AC power 5 export current signal by positive signal
At the time of at the time of being transformed into negative signal or being transformed into positive signal by negative signal, so as to fulfill the electricity exported to AC power 5
Flow the detection of the current zero-crossing point of signal.
The utility model provides a kind of contactor protective device, including zero cross detection circuit, control circuit, contactor drive
Dynamic circuit and contactor；The first input end of zero cross detection circuit is connected with the firewire of AC power, and the of zero cross detection circuit
Two input terminals are connected with the zero curve of AC power, and the output terminal of zero cross detection circuit passes through control circuit and contactor drive circuit
It is connected, contactor drive circuit is also connected with the input terminal of contactor；Zero cross detection circuit includes photoelectrical coupler, pull-up resistor
And power module；First input end of the first end of light emitting diode in photoelectrical coupler as zero cross detection circuit, shines
Second input terminal of the second end of diode as zero cross detection circuit；The first end and pull-up of light-receiving device in photoelectrical coupler
The first end of resistance is connected, output terminal of its common port as zero cross detection circuit, the second end ground connection of light-receiving device, pull-up resistor
Second end be connected with the output terminal of power module, light-receiving device turn on when current direction be by light-receiving device first end flow direction by
The second end of light device.
With in the prior art using a/d converter compared with the core devices of zero cross detection circuit, the utility model is by photoelectricity
Core devices of the coupler as zero cross detection circuit, when the current signal of AC power output is transformed into negative signal by positive signal
Or when by negative signal being transformed into positive signal, the working status of photoelectrical coupler can change accordingly so that zero passage detection
The output signal of circuit changes accordingly, it is achieved thereby that the detection to current zero-crossing point.Mistake provided by the utility model
Photoelectrical coupler cost in zero detection circuit is low, detects and controls relatively simple, reliability height.
On the basis of above-described embodiment：
As a kind of preferred embodiment, the first end of the cathode of light emitting diode D as light emitting diode D shines two
Second end of the anode of pole pipe D as light emitting diode D.
Specifically, the cathode of light emitting diode D is connected with the firewire of AC power 5, the anode of light emitting diode D and friendship
The zero curve in galvanic electricity source 5 is connected.When the current signal that AC power 5 exports is positive signal, light emitting diode D is in cut-off shape
The output terminal output high level of state, then zero cross detection circuit 1；When the current signal that AC power 5 exports is negative signal, shine
Diode D is in the conduction state, then the output terminal output low level of zero cross detection circuit 1.
Therefore, when the current signal that AC power 5 exports is transformed into negative signal by positive signal, zero cross detection circuit 1 is defeated
The signal gone out is transformed into low level by high level, that is to say, that where the trailing edge in the signal that zero cross detection circuit 1 exports
At the time of moment is transformed into negative signal for the current signal that AC power 5 exports by positive signal.Similarly, zero cross detection circuit 1 is defeated
At the time of where rising edge in the signal gone out for the current signal that AC power 5 exports by negative signal be transformed into positive signal when
Carve, so as to detect the current zero-crossing point for the current signal that AC power 5 exports.
As a kind of preferred embodiment, the first end of the anode of light emitting diode D as light emitting diode D shines two
Second end of the cathode of pole pipe D as light emitting diode D.
Certainly, light emitting diode D can also be the sun of light emitting diode D with AC power 5 except above-mentioned connection method
Pole is connected with the firewire of AC power 5, and the cathode of light emitting diode D is connected with the zero curve of AC power 5.On the contrary, when exchange
When the current signal that power supply 5 exports is positive signal, light emitting diode D is in the conduction state, then the output terminal of zero cross detection circuit 1
Export low level；When the current signal that AC power 5 exports is negative signal, light emitting diode D is in cut-off state, then mistake
The output terminal output high level of zero detection circuit 1.
Therefore, when the current signal that AC power 5 exports is transformed into negative signal by positive signal, zero cross detection circuit 1 is defeated
The signal gone out is transformed into high level by low level, that is to say, that where the rising edge in the signal that zero cross detection circuit 1 exports
At the time of moment is transformed into negative signal for the current signal that AC power 5 exports by positive signal.Similarly, zero cross detection circuit 1 is defeated
At the time of where trailing edge in the signal gone out for the current signal that AC power 5 exports by negative signal be transformed into positive signal when
Carve.Either which kind of connection method, can detect the current zero-crossing point for the current signal that AC power 5 exports.As for tool
Which kind of connection method body selects, and the utility model is not particularly limited herein, depending on actual conditions.
As a kind of preferred embodiment, light-receiving device Q is phototriode, and the collector of phototriode is as light-receiving device
The first end of Q, the second end of the emitter of phototriode as light-receiving device Q.
Specifically, phototriode is selected to be used as light-receiving device Q, then the of the collector of phototriode and pull-up resistor R
One end is connected, the emitter ground connection of phototriode.There is phototriode larger photoelectric current amplification to act on, and sensitivity is very
It is high.
Certainly, the application can also select other light-sensitive devices the utility model not done particularly herein as light-receiving device Q
Limit, depending on actual conditions.
As a kind of preferred embodiment, zero cross detection circuit 1 further includes the first current limliting module 13 and the second current limliting module
14, wherein：
The first end of first current limliting module 13 is connected with the firewire of AC power 5, the second end of the first current limliting module 13 with
The anode of light emitting diode D is connected, and the first end of the second current limliting module 14 is connected with the zero curve of AC power 5, the second current limliting mould
The second end of block 14 is connected with the cathode of light emitting diode D.
In order to protect zero cross detection circuit 1, current limliting module is added between AC power 5 and light emitting diode D.Specifically
Ground, when the firewire of AC power 5 is connected with the anode of light emitting diode D, the zero curve of AC power 5 and the moon of light emitting diode D
When being extremely connected, the first end of the first current limliting module 13 is connected with the firewire of AC power 5, the second end of the first current limliting module 13
It is connected with the anode of light emitting diode D, the first end of the second current limliting module 14 is connected with the zero curve of AC power 5, the second current limliting
The second end of module 14 is connected with the cathode of light emitting diode D.If using AC power 5 and the another kind of light emitting diode D
Connection mode, then current limliting module corresponding should change with the connection mode of the two.
Connection mode hereafter is connected with the firewire of AC power 5 with the anode of light emitting diode D, AC power 5
Zero curve based on the cathode of light emitting diode D with being described, it is of course also possible to the another of AC power 5 and light emitting diode D
Described based on a kind of connection mode, then connection mode hereafter should change accordingly.
As a kind of preferred embodiment, the first current limliting module 13 and the second current limliting module 14 include the N electricity connected
Resistance, wherein, N is the integer not less than 1.
Specifically, the first current limliting module 13 and the second current limliting module 14 select the resistance of N number of series connection to realize that current limliting is protected
Protective function, composition are simple.Which concrete numerical value is selected as N, the utility model is not particularly limited herein, according to actual feelings
Depending on condition.
Certainly, the application can also select other devices to form current limliting module, and the utility model does not do special limit herein
It is fixed, depending on actual conditions.
As a kind of preferred embodiment, zero cross detection circuit 1 further includes diode, and the cathode of diode is respectively with first
The second end of current limliting module 13 is connected with the anode of light emitting diode D, the anode of diode respectively with the second current limliting module 14
Second end is connected with the cathode of light emitting diode D.
Specifically, when the current signal that AC power 5 exports is positive signal, diode is in cut-off state, does not influence
The normal work of circuit；When the current signal that AC power 5 exports is negative signal, diode is in the conduction state, avoids
Current signal flows through light emitting diode D, reduces the stress of light emitting diode D, so as to protect photoelectrical coupler 11, improves
The security performance of zero cross detection circuit 1.
Fig. 2 is refer to, Fig. 2 is the structure diagram of another contactor protective device provided by the utility model.
As a kind of preferred embodiment, zero cross detection circuit 1 further includes filter circuit, and the filter circuit includes first
Capacitance C1 and first resistor R1；Wherein：
The first end of first capacitance C1 is connected with the first end of first resistor R1, its common port respectively with the first current limliting module
13 second end, the cathode of diode are connected with the anode of light emitting diode D, second end and the first resistor R1 of the first capacitance C1
Second end be connected, its common port second end with the second current limliting module 14, the anode and light emitting diode D of diode respectively
Cathode be connected.
In order to filter the interference in power grid, prevent photoelectrical coupler 11 from having malfunction, diode and light emitting diode D it
Between with the addition of filter circuit, filter circuit includes the first capacitance C1 and first resistor R1.Specifically, the first end of the first capacitance C1
Be connected with the first end of first resistor R1, its common port respectively the second end with the first current limliting module 13, diode cathode and
The anode of light emitting diode D is connected, and the second end of the first capacitance C1 is connected with the second end of first resistor R1, its common port difference
The anode of second end, diode and the cathode of light emitting diode D with the second current limliting module 14 are connected, and improve zero passage detection electricity
The reliability on road 1.
As a kind of preferred embodiment, contactor drive circuit 3 is phase inverter.
Specifically, selecting phase inverter, phase inverter is fast with operating rate, carrying load ability as contactor drive circuit 3
By force, the advantages such as transmission performance is good.The phasing back 180 degree for the control signal that phase inverter can export control circuit 2, so as to protect
Control circuit 2 is demonstrate,proved according to the control of contactor 4 requirement come closure or the disconnection accordingly of control contactor 4.For example work as contact
When controlling requirement to require the closure of contactor 4 of device 4, the control signal that control circuit 2 exports is after inverter, control
Contactor 4 closes.
Certainly, the application can also select other devices to form contactor drive circuit 3, and the utility model is not spy herein
Other restriction, depending on actual conditions.
The utility model additionally provides a kind of alternating-current charging pile, including any of the above-described kind of contactor protective device.
Introduction for alternating-current charging pile provided by the utility model refer to above-mentioned contactor protective device embodiment, this
Details are not described herein for utility model.
It should also be noted that, in the present specification, term " comprising ", "comprising" or its any other variant are intended to contain
Lid non-exclusive inclusion, so that process, method, article or equipment including a series of elements not only will including those
Element, but also including other elements that are not explicitly listed, or further include as this process, method, article or equipment
Intrinsic key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that
Also there are other identical element in process, method, article or equipment including the key element.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or new using this practicality
Type.A variety of modifications to these embodiments will be apparent for those skilled in the art, determine herein
The General Principle of justice can be realized in other embodiments without departing from the spirit or scope of the present utility model.Cause
This, the utility model is not intended to be limited to the embodiments shown herein, and is to fit to and principles disclosed herein
The most wide scope consistent with features of novelty.
Claims (10)
1. a kind of contactor protective device, it is characterised in that including zero cross detection circuit, control circuit, contactor drive circuit
And contactor；Wherein, the first input end of the zero cross detection circuit is connected with the firewire of AC power, the zero passage detection electricity
Second input terminal on road is connected with the zero curve of the AC power, and the output terminal of the zero cross detection circuit passes through the control electricity
Road is connected with the contactor drive circuit, and input terminal of the contactor drive circuit also with the contactor is connected；
The zero cross detection circuit includes photoelectrical coupler, pull-up resistor and power module；Wherein, in the photoelectrical coupler
First input end of the first end of light emitting diode as the zero cross detection circuit, the second end conduct of the light emitting diode
Second input terminal of the zero cross detection circuit；The first end of light-receiving device in the photoelectrical coupler and the pull-up resistor
First end is connected, output terminal of its common port as the zero cross detection circuit, the second end of light-receiving device ground connection, it is described on
The second end of pull-up resistor is connected with the output terminal of the power module, wherein, the current direction when light-receiving device turns on is served as reasons
The first end of the light-receiving device flows to the second end of the light-receiving device.
2. device as claimed in claim 1, it is characterised in that the cathode of the light emitting diode is as the light emitting diode
First end, the second end of the anode of the light emitting diode as the light emitting diode.
3. device as claimed in claim 1, it is characterised in that the anode of the light emitting diode is as the light emitting diode
First end, the second end of the cathode of the light emitting diode as the light emitting diode.
4. device as claimed in claim 3, it is characterised in that the light-receiving device is phototriode, the phototriode
First end of the collector as the light-receiving device, the second end of the emitter of the phototriode as the light-receiving device.
5. device as claimed in claim 4, it is characterised in that the zero cross detection circuit further includes the first current limliting module and
Two current limliting modules, wherein：
The first end of the first current limliting module is connected with the firewire of the AC power, the second end of the first current limliting module
It is connected with the anode of the light emitting diode, the first end of the second current limliting module is connected with the zero curve of the AC power,
The second end of the second current limliting module is connected with the cathode of the light emitting diode.
6. device as claimed in claim 5, it is characterised in that the first current limliting module and the second current limliting module are wrapped
The resistance of N number of series connection is included, wherein, N is the integer not less than 1.
7. device as claimed in claim 6, it is characterised in that the zero cross detection circuit further includes diode, two pole
The cathode of pipe is connected with the second end of the first current limliting module and the anode of the light emitting diode respectively, the diode
Anode is connected with the second end of the second current limliting module and the cathode of the light emitting diode respectively.
8. device as claimed in claim 7, it is characterised in that the zero cross detection circuit further includes filter circuit, the filter
Wave circuit includes the first capacitance and first resistor；Wherein：
The first end of first capacitance is connected with the first end of the first resistor, its common port respectively with first current limliting
The second end of module, the cathode of the diode are connected with the anode of the light emitting diode, the second end of first capacitance
It is connected with the second end of the first resistor, its common port second end with the second current limliting module, the diode respectively
Anode be connected with the cathode of the light emitting diode.
9. such as claim 1-8 any one of them devices, it is characterised in that the contactor drive circuit is phase inverter.
10. a kind of alternating-current charging pile, it is characterised in that including such as claim 1-9 any one of them contactor protective device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721204858.5U CN207339234U (en) | 2017-09-19 | 2017-09-19 | A kind of contactor protective device and alternating-current charging pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721204858.5U CN207339234U (en) | 2017-09-19 | 2017-09-19 | A kind of contactor protective device and alternating-current charging pile |
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| Publication Number | Publication Date |
|---|---|
| CN207339234U true CN207339234U (en) | 2018-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201721204858.5U Active CN207339234U (en) | 2017-09-19 | 2017-09-19 | A kind of contactor protective device and alternating-current charging pile |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110514932A (en) * | 2019-08-30 | 2019-11-29 | 广州市帝能云科技有限公司 | A kind of load detection circuit for access |
-
2017
- 2017-09-19 CN CN201721204858.5U patent/CN207339234U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110514932A (en) * | 2019-08-30 | 2019-11-29 | 广州市帝能云科技有限公司 | A kind of load detection circuit for access |
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