CN206060516U - A kind of current sampling circuit and surge protection circuit - Google Patents
A kind of current sampling circuit and surge protection circuit Download PDFInfo
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- CN206060516U CN206060516U CN201620977499.6U CN201620977499U CN206060516U CN 206060516 U CN206060516 U CN 206060516U CN 201620977499 U CN201620977499 U CN 201620977499U CN 206060516 U CN206060516 U CN 206060516U
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Abstract
The utility model discloses a kind of current sampling circuit and surge protection circuit, current sampling circuit includes：Power supply circuits, power supply circuits are connected with resonance circuit, to provide electric energy as resonance circuit；Resonance circuit, resonance circuit include coil panel, resonant capacitance, switching tube；Wherein, coil panel composes in parallel resonant tank with resonant capacitance, and resonant tank is connected with switching tube；Current processing loop, current processing loop include valley observation circuit, backward voltage amplifying circuit；Wherein, the input of valley observation circuit is connected with resonance circuit, so that current signal is gathered from resonance circuit；The current signal for collecting is converted into corresponding voltage dips signal by valley observation circuit；The outfan of valley observation circuit is connected with the input of backward voltage amplifying circuit, and voltage dips signal output is carried out signals reverse and processing and amplifying to backward voltage amplifying circuit.
Description
Technical field
This utility model is related to current sample and circuit protection technology, more particularly to a kind of current sampling circuit and surge are protected
Protection circuit.
Background technology
Electromagnetic heating apparatus are a kind of equipment that electric energy is converted into heat energy using electromagnetic principle.In electromagnetic heating apparatus
In circuit structure, typically all there is current sampling circuit, current sampling circuit can be sampled to the electric current in circuit structure.
Current sampling circuit is sampled to the electric current in circuit structure typically using following process：Constantan wire will be flow through
Current signal is converted into voltage signal, and this voltage signal is converted into the fluctuation width of linear correlation through amplifier integrating amplification circuit
Less d. c. voltage signal is spent, micro-control unit (MCU, Microcontroller Unit) is carried out to the d. c. voltage signal
Periodically simulation numeral (AD, Analog Digital) sampling, sampled value can reflect the variable quantity of electric current in circuit structure.
Then, the variable quantity of electric current is compared by MCU after treatment with the reference voltage in comparator, is judged according to comparative result
Whether trigger current surge protection.
Above-mentioned current sample scheme cannot fast and effeciently monitor maximum (namely the current peak of electric current in circuit structure
Value), so as to surge protection cannot be carried out to circuit structure fast and effeciently.
Utility model content
To solve above-mentioned technical problem, this utility model embodiment provides a kind of current sampling circuit and surge protection electricity
Road, current peak that can more effectively in observation circuit structure such that it is able to which faster response current surge signal is tied to circuit
Structure carries out effective surge protection.
The current sampling circuit that this utility model embodiment is provided, including：
Power supply circuits, the power supply circuits are connected with resonance circuit, to provide electric energy as the resonance circuit；
Resonance circuit, the resonance circuit include coil panel, resonant capacitance, switching tube；Wherein, the coil panel with it is described
Resonant capacitance composes in parallel resonant tank, and the resonant tank is connected with the switching tube；
Current processing loop, the current processing loop include valley observation circuit, backward voltage amplifying circuit；Wherein,
The input of the valley observation circuit is connected with the resonance circuit, to gather current signal from the resonance circuit；Institute
State valley observation circuit and the current signal for collecting is converted into into corresponding voltage dips signal；The valley observation circuit it is defeated
Go out end to be connected with the input of the backward voltage amplifying circuit, by the voltage dips signal output to the backward voltage
Amplifying circuit carries out signals reverse and processing and amplifying.
In this utility model embodiment, the valley observation circuit includes current converter circuit, first resistor, valley process
Loop；Wherein,
The current converter circuit collects current signal from the resonance circuit, and the current signal is converted into phase
After the voltage signal answered, first resistor described in Jing is exported to the valley treatment loop；The valley treatment loop is according to the electricity
The change of pressure signal is charged process or discharge process, and the voltage signal is gathered in the charging process or discharge process
Corresponding valley signal.
In this utility model embodiment, the current converter circuit includes second resistance, the first electric capacity；Wherein,
Connected with the resonance circuit after the parallel connection of the second resistance and first electric capacity again, so as to described the will be flowed through
One ohmically current signal is converted into corresponding voltage signal.
In this utility model embodiment, the second resistance is constantan wire resistance.
In this utility model embodiment, the valley treatment loop include first comparator, first crystal diode, second
Crystal diode, 3rd resistor, electrochemical capacitor；Wherein,
The first crystal diode, the second crystal diode and 3rd resistor are sequentially connected composition loop；Described
The positive pole of one crystal diode is connected with the negative pole of second crystal diode；
The first input end of the first comparator is connected to the first resistor, the second input of the first comparator
End is connected between the first crystal diode and 3rd resistor, and the outfan of the first comparator is connected to described first
Between crystal diode and the second crystal diode；
The positive pole of the electrochemical capacitor is connected between second crystal diode and 3rd resistor, the electrochemical capacitor
Negative pole be connected to the ground.
In this utility model embodiment, when the voltage signal reduces, the electrochemical capacitor Jing first crystal diodes
Discharge with the second crystal diode, until the voltage signal reaches valley；
When the voltage signal starts increase from valley, the second crystal two described in the outfan Jing of the first comparator
Pole pipe and 3rd resistor charge to the electrochemical capacitor；
Wherein, the resistance of the 3rd resistor is more than or equal to preset value, correspondingly, the voltage variety of the electrochemical capacitor
Less than or equal to preset range.
In this utility model embodiment, the backward voltage amplifying circuit includes the 4th resistance, the 5th resistance, the 6th electric
Resistance, the second comparator；Wherein,
4th resistance described in the first input end Jing of second comparator is connected to the ground, and the second of second comparator
5th resistance described in input Jing is connected between second crystal diode and 3rd resistor and the 6th resistance described in Jing connects
It is connected to the outfan of second comparator.
In this utility model embodiment, the output end yoke of second comparator goes out two branch roads, wherein a branch road connects
MCU is connected to, another branch road is connected to surging signal process circuit.
The surge protection circuit that this utility model embodiment is provided, including above-mentioned arbitrarily described current sampling circuit, wave
Signal processing circuit is gushed, the current sampling circuit is connected with the surging signal process circuit；Wherein,
The current sampling circuit is converted into the current signal for collecting after corresponding voltage dips signal, carries out signal
Reversely and processing and amplifying and as current surge signal output to the surging signal process circuit；The surging signal processes electricity
Road is controlled to the switching tube of the resonance circuit in the current sampling circuit according to the current surge signal, with to described
Resonance circuit carries out surge protection.
In this utility model embodiment, the surging signal process circuit includes the 3rd comparator, surge controller；Its
In,
The first input end of the 3rd comparator is connected to the current sampling circuit, and the second of the 3rd comparator
Input is connected to reference voltage, and the outfan of the 3rd comparator is connected to the surge controller；
The surge controller is connected with the switching tube of the resonance circuit, and the surge controller is according to the described 3rd ratio
The switching tube of the resonance circuit is controlled compared with the signal of device output.
In this utility model embodiment, it is higher than reference voltage that the 3rd comparator compares the voltage of current surge signal
When, the 3rd comparator exports surge control signal to the surge controller so that the surge controller cuts out described
The switching tube of resonance circuit.
In the technical scheme of this utility model embodiment, current sampling circuit includes：Power supply circuits, the power supply circuits with
Resonance circuit connects, to provide electric energy as the resonance circuit；Resonance circuit, the resonance circuit include coil panel, resonance electricity
Appearance, switching tube；Wherein, the coil panel composes in parallel resonant tank with the resonant capacitance, and the resonant tank is opened with described
Close pipe series connection；Current processing loop, the current processing loop include valley observation circuit, backward voltage amplifying circuit；Wherein,
The input of the valley observation circuit is connected with the resonance circuit, to gather current signal from the resonance circuit；Institute
State valley observation circuit and the current signal for collecting is converted into into corresponding voltage dips signal, this voltage dips signal can
The maximum (namely peak value) of electric current in reflection resonance circuit, in resonance circuit, electric current is bigger, then voltage dips are lower；The paddy
The outfan of value observation circuit is connected with the input of the backward voltage amplifying circuit, by the voltage dips signal output
Signals reverse and processing and amplifying are carried out to the backward voltage amplifying circuit, as such, it is possible to voltage dips signal is believed by negative sense
Number it is changed into forward signal, this forward signal has effectively reflected the maximum of electric current in circuit structure.When this is positive
When signal accesses to surging signal process circuit, surge protection can be carried out to circuit configuration effectively.
Description of the drawings
Schematic diagrams of the Fig. 1 for the current sampling circuit of this utility model embodiment；
Schematic diagrams of the Fig. 2 for the power supply circuits of this utility model embodiment；
Schematic diagrams of the Fig. 3 for the resonance circuit of this utility model embodiment；
Schematic diagrams one of the Fig. 4 for the valley observation circuit of this utility model embodiment；
Schematic diagrams two of the Fig. 5 for the valley observation circuit of this utility model embodiment；
Schematic diagrams one of the Fig. 6 for the surge protection circuit of this utility model embodiment；
Schematic diagrams two of the Fig. 7 for the surge protection circuit of this utility model embodiment.
Specific embodiment
The characteristics of in order to more fully hereinafter understand this utility model embodiment and technology contents, it is right below in conjunction with the accompanying drawings
The realization of this utility model embodiment is described in detail, appended accompanying drawing purposes of discussion only for reference, not for limiting this reality
Use new embodiment.
The technical scheme of this utility model embodiment, by valley observation circuit regulated output voltage valley signal, with this
Voltage dips signal carries out sampling processing for MCU as the variable quantity of electric current in reflection circuit structure.Additionally, MCU is according to voltage
Valley signal is compared by comparator with the reference voltage of setting, to judge whether to trigger surge protection.
Schematic diagrams one of the Fig. 1 for the current sampling circuit of this utility model embodiment, as shown in figure 1, the current sample
Circuit includes：
Power supply circuits 10, the power supply circuits 10 are connected with resonance circuit 20, to provide electric energy as the resonance circuit 20；
Resonance circuit 20, the resonance circuit 20 include coil panel 201, resonant capacitance 202, switching tube 203；Wherein, institute
Stating coil panel 201 and resonant tank being composed in parallel with the resonant capacitance 202, the resonant tank is connected with the switching tube 203；
Current processing loop 30, the current processing loop 30 include valley observation circuit 301, backward voltage amplifying circuit
302；Wherein, the input of the valley observation circuit 301 is connected with the resonance circuit 20, with from the resonance circuit 20
Collection current signal；The current signal for collecting is converted into corresponding voltage dips signal by the valley observation circuit 301；Institute
The outfan for stating valley observation circuit 301 is connected with the input of the backward voltage amplifying circuit 302, by the voltage paddy
Value signal is exported to the backward voltage amplifying circuit 302 and carries out signals reverse and processing and amplifying.
Below the particular circuit configurations in current sampling circuit are elaborated.
1) power supply circuits
With reference to shown in Fig. 2, power supply circuits 10 include：Commutator 101, filter circuit 102, electric capacity of voltage regulation 103.Power supply
(alternating current of such as 220V) carries out voltage stabilizing after commutator 101 and filter circuit 102, then by electric capacity of voltage regulation 103, is humorous
The circuit 20 that shakes provides energy.The first end (such as the left end in figure) of commutator 101 is connected with power supply, and the of commutator 101
Two ends (such as the right-hand member in figure) are connected with filter circuit 102 and electric capacity of voltage regulation 103, and here, filter circuit 102 can be by inductance reality
It is existing.
2) resonance circuit
With reference to shown in Fig. 3, resonance circuit 20 includes coil panel 201, resonant capacitance 202, switching tube 203；Wherein, the line
Circle disk 201 composes in parallel resonant tank with the resonant capacitance 202, and the resonant tank is connected with the switching tube 203.
Coil panel 201 and the composition resonant tank of resonant capacitance 202, resonant tank is the realization that electric energy is converted into electromagnetic energy
Part.Wherein, coil panel 201 refers to the coil panel being connected between OUT1 and OUT2, represents inductance.Resonant tank passes through switching tube
203, such as the HF switch (of insulated gate bipolar transistor (IGBT, Insulated Gate Bipolar Transistor)
As frequency in 20K-30K) form LC vibrations, so as to the electric current for forming high frequency change on coil panel 201, the electric current of change made again
Obtain the electromagnetic wave that coil panel 201 produces change.
In this utility model embodiment, switching tube 203 is opened and closure by MCU controls.Switching tube 203 is opened, coil panel
201 storage efficiencies；Switching tube 203 is closed, and resonant tank carries out resonance, the output energy of coil panel 201.
3) current processing loop
Current processing loop 30 includes valley observation circuit 301, backward voltage amplifying circuit 302；Wherein,
With reference to shown in Fig. 4, the valley observation circuit 301 includes current converter circuit 3011, first resistor 3012, valley
Treatment loop 3013；Wherein,
The current converter circuit 3011 collects current signal from the resonance circuit 20, and the current signal is turned
After turning to corresponding voltage signal, first resistor 3012 described in Jing is exported to the valley treatment loop 3013；The valley is processed
Loop 3013 is charged process or discharge process according to the change of the voltage signal, in the charging process or discharge process
It is middle to gather the corresponding valley signal of the voltage signal.
Specifically, as shown in figure 5, the current converter circuit 3011 includes second resistance 51, the first electric capacity 52；Wherein,
The second resistance 51 is connected with the resonance circuit 20 again with after 52 parallel connection of the first electric capacity, so as to flow through
Current signal in the first resistor 3012 is converted into corresponding voltage signal.
In such scheme, the second resistance 51 is constantan wire resistance.Constantan wire is the resistance with cupro-nickel as Main Ingredients and Appearance
Alloy.Constantan wire has relatively low temperature-coefficient of electrical resistance, and wider use temperature range (less than 480 DEG C), processing characteristics are good,
With good welding performance.
As shown in figure 5, the valley treatment loop 3013 includes first comparator 53, first crystal diode 54, first
Crystal diode 55,3rd resistor 56, electrochemical capacitor 57；Wherein,
The first crystal diode 54, first crystal diode 55 and 3rd resistor 56 are sequentially connected composition loop；
The positive pole of the first crystal diode 54 is connected with the negative pole of the first crystal diode 55；
The first input end of the first comparator 53 is connected to the first resistor 3012, the first comparator 53
Second input is connected between the first crystal diode 54 and 3rd resistor 56, the outfan of the first comparator 53
It is connected between the first crystal diode 54 and first crystal diode 55；
The positive pole of the electrochemical capacitor 57 is connected between the first crystal diode 55 and 3rd resistor 56, the electricity
The negative pole of solution electric capacity 57 is connected to the ground.
In such scheme, first input end refers both to forward signal input, and the second input refers both to negative-going signal input.
In such scheme, when the voltage signal reduces, 57 Jing first crystals diode 54 of the electrochemical capacitor and
One crystal diode 55 discharges, until the voltage signal reaches valley；
When the voltage signal starts increase from valley, first crystal described in the outfan Jing of the first comparator 53
Diode 55 and 3rd resistor 56 charge to the electrochemical capacitor 57；
Wherein, the resistance of the 3rd resistor 56 is more than or equal to preset value, and correspondingly, the voltage of the electrochemical capacitor 57 becomes
Change amount is less than or equal to preset range.
Specifically, the workflow of valley treatment loop 3013 is as follows：First resistor 3012 is to valley treatment loop 3013
The voltage signal that input sample is arrived, here, voltage signal refers to that the current signal in circuit is converted by current converter circuit 3011
For voltage signal.Here, when voltage signal is maximum negative-going signal, corresponding voltage dips are maximum negative value.Negative sense
For forward direction, when voltage signal is less than normal voltage, then the voltage signal is negative-going signal；When voltage signal is more than
During normal voltage, then the voltage signal is forward signal.Generally, normal voltage is ground voltage, also referred to as no-voltage.The work(of circuit
Rate is higher, and the electric current for flowing through is bigger, and voltage dips are lower.When voltage signal is from zero point to voltage dips (minimum of voltage)
During change, electrochemical capacitor 57 discharges through first crystal diode 54, first crystal diode 55, until it reaches minimum point is (right
Answer voltage dips)；When voltage signal is from valley to Zero change, first crystal two described in the outfan Jing of first comparator 53
Pole pipe 55 and 3rd resistor 56 charge to the electrochemical capacitor 57, here, due to the resistance of 3rd resistor 56 it is larger, electrochemical capacitor
57 voltage variety very little.In whole voltage signal cycles, the voltage signal of electrochemical capacitor 57 is basically stable at voltage paddy
Value.It can be seen that, the electric current for flowing through first resistor 3012 is bigger, and the voltage dips of 57 stable output of electrochemical capacitor are lower, therefore, can
With the voltage dips signal that exported with electrochemical capacitor 57 come the variable quantity of kinetic current.
With reference to shown in Fig. 5, the backward voltage amplifying circuit 302 includes the 4th resistance 58, the 5th resistance 59, the 6th resistance
510th, the second comparator 511；Wherein,
4th resistance 58 described in the first input end Jing of second comparator 511 is connected to the ground, second comparator
5th resistance 59 described in 511 the second input Jing is connected between the first crystal diode 55 and 3rd resistor 56 and Jing
6th resistance 510 is connected to the outfan of second comparator 511.
The output end yoke of second comparator 511 goes out two branch roads, wherein a branch road is connected to micro-control unit
MCU, another branch road are connected to surging signal process circuit.
In such scheme, first input end refers both to forward signal input, and the second input refers both to negative-going signal input.
The voltage signal values of the output of valley observation circuit 301 are not enough to carry out at signal for MCU typically in tens of millivolts
Reason, therefore, this utility model embodiment arranges one-level backward voltage amplifying circuit in the outfan side of valley observation circuit 301
302.On the one hand, voltage signal is converted into forward signal by negative-going signal by backward voltage amplifying circuit 302；On the other hand, instead
Voltage signal is arranged in the manageable magnitudes of voltage of MCU, here to voltage amplifier circuit 302, amplification Av=-R1/
R2, wherein, Av represents amplification, and R1 represents the resistance of the 6th resistance 510, and R2 represents the resistance of the 5th resistance 59.By reverse
The voltage signal of the output of voltage amplifier circuit 302 is divided into two-way output, exports to MCU as MCU voltage sampling signals all the way；Separately
Surge protection is carried out for subsequent surges signal processing circuit as current surge signal all the way.
This utility model embodiment additionally provides a kind of surge protection circuit, as shown in fig. 6, the surge protection circuit bag
Include the arbitrarily described current sampling circuit 61 of above-described embodiment, surging signal process circuit 62, the current sampling circuit 61 with
The surging signal process circuit 62 connects；Wherein,
The current sampling circuit 61 is converted into the current signal for collecting after corresponding voltage dips signal, carries out letter
Number reversely and processing and amplifying and as current surge signal output to the surging signal process circuit 62；At the surging signal
Reason circuit 62 is carried out to the switching tube 203 of the resonance circuit 20 in the current sampling circuit 61 according to the current surge signal
Control, to carry out surge protection to the resonance circuit 20.
Surge current refer to power on moment or produce in the case where abnormal conditions occurs in circuit much larger than steady-state current
Peak point current or overcurrent.In the electronic device, surge generally refers to the strong of that moment breath generation that power supply has just been opened
Power pulse, or due in power supply or circuit other parts be subject to itself or external spike to disturb.Surge current may make electricity
Road being burned in a flash in surge, such as resistance are blown etc..And surge protection is designed using non-linear element
Protection circuit.
In this utility model embodiment, the voltage dips signal of the output of current sampling circuit 61 can reflect electricity in circuit
The change of stream, more can reflect whether electric current occurs in that peak value.
In this utility model embodiment, the surging signal process circuit 62 includes the 3rd comparator 621, surge controller
622；Wherein,
The first input end of the 3rd comparator 621 is connected to the current sampling circuit 61, the 3rd comparator
621 the second input is connected to reference voltage, and the outfan of the 3rd comparator 621 is connected to the surge controller
622；
The surge controller 622 is connected with the switching tube 203 of the resonance circuit 20, the surge controller 622
The signal exported according to the 3rd comparator 621 is controlled to the switching tube 203 of the resonance circuit 20.
In such scheme, first input end refers both to forward signal input, and the second input refers both to negative-going signal input.
In this utility model embodiment, the 3rd comparator 621 compares the voltage of current surge signal higher than reference
During voltage, the 3rd comparator 621 exports surge control signal to the surge controller 622 so that the surge control
Device 622 cuts out the switching tube 203 of the resonance circuit 20.
Here, (there is not surge current) under normal condition in circuit, and reference voltage is more than current surge signal,
So the 3rd comparator 621 is output as low level；When there is surge current, reference voltage is less than current surge signal, so
3rd comparator 62 exports high level.3rd comparator 62 exports this high level signal to surge controller 622.Surge is controlled
The switching tube 203 of the control resonance circuit 20 of device 622 is closed.
In this utility model embodiment, the concrete current sampling circuit 61 and surging signal in surge protection circuit processes electricity
Road 62 with reference to shown in Fig. 7, wherein, in current sampling circuit 61, the function of each device can refer to the description of previous embodiment and carry out
Understand.
For the surge controller 622 in surging signal process circuit 62, surge controller 622 can pass through but not
The switching tube 20 being confined in the following manner control resonance circuit 20.
Mode one：Surge control signal directly acts on the PPG control modules inside MCU, PPG control modules response surge
Control signal stops output PPG signals, so as to closing switch pipe 20.
Mode two：Surge control signal directly acts on IGBT drive circuit module, forces the base electrode of switching tube 20
Signal is dragged down so that switching tube 20 is closed.
Mode three：Using the driving voltage (+18V) of the direct roof-cut resistence pipe of surge control signal 20 so that switching tube 20
Close.
The technical scheme of this utility model embodiment, voltage dips signal can reflect the change of electric current in circuit structure
Amount, can effectively carry out MCU current samples and surge protection using voltage dips signal.Meanwhile, using voltage dips signal
It is capable of the peak value of effective monitoring electric current, can be with faster response current surge signal, so as to quickly carry out surge guarantor to circuit structure
Shield.
Between technical scheme described in this utility model embodiment, in the case where not conflicting, can be in any combination.
The above, specific embodiment only of the present utility model, but protection domain of the present utility model do not limit to
In this, any those familiar with the art can readily occur in change in the technical scope that this utility model is disclosed
Or replace, should all cover within protection domain of the present utility model.
Claims (11)
1. a kind of current sampling circuit, it is characterised in that the current sampling circuit includes：
Power supply circuits, the power supply circuits are connected with resonance circuit, to provide electric energy as the resonance circuit；
Resonance circuit, the resonance circuit include coil panel, resonant capacitance, switching tube；Wherein, the coil panel and the resonance
Electric capacity composes in parallel resonant tank, and the resonant tank is connected with the switching tube；
Current processing loop, the current processing loop include valley observation circuit, backward voltage amplifying circuit；Wherein, it is described
The input of valley observation circuit is connected with the resonance circuit, to gather current signal from the resonance circuit；The paddy
The current signal for collecting is converted into corresponding voltage dips signal by value observation circuit；The outfan of the valley observation circuit
It is connected with the input of the backward voltage amplifying circuit, the voltage dips signal output is amplified to the backward voltage
Circuit carries out signals reverse and processing and amplifying.
2. current sampling circuit according to claim 1, it is characterised in that the valley observation circuit includes that electric current is changed
Circuit, first resistor, valley treatment loop；Wherein,
The current converter circuit collects current signal from the resonance circuit, and the current signal is converted into accordingly
After voltage signal, first resistor described in Jing is exported to the valley treatment loop；The valley treatment loop is believed according to the voltage
Number change be charged process or discharge process, voltage signal correspondence is gathered in the charging process or discharge process
Valley signal.
3. current sampling circuit according to claim 2, it is characterised in that the current converter circuit includes that second is electric
Resistance, the first electric capacity；Wherein,
The second resistance is connected with the resonance circuit again with after first electric capacity parallel connection, electric so as to flow through described first
Current signal in resistance is converted into corresponding voltage signal.
4. current sampling circuit according to claim 3, it is characterised in that the second resistance is constantan wire resistance.
5. current sampling circuit according to claim 2, it is characterised in that the valley treatment loop includes that first compares
Device, first crystal diode, the second crystal diode, 3rd resistor, electrochemical capacitor；Wherein,
The first crystal diode, the second crystal diode and 3rd resistor are sequentially connected composition loop；Described first is brilliant
The positive pole of body diode is connected with the negative pole of second crystal diode；
The first input end of the first comparator is connected to the first resistor, and the second input of the first comparator connects
It is connected between the first crystal diode and 3rd resistor, the outfan of the first comparator is connected to the first crystal
Between diode and the second crystal diode；
The positive pole of the electrochemical capacitor is connected between second crystal diode and 3rd resistor, the electrochemical capacitor it is negative
Pole is connected to the ground.
6. current sampling circuit according to claim 5, it is characterised in that
When the voltage signal reduces, the electrochemical capacitor Jing first crystals diode and the second crystal diode discharge, directly
Valley is reached to the voltage signal；
When the voltage signal starts increase from valley, the second crystal diode described in the outfan Jing of the first comparator
Charge to the electrochemical capacitor with 3rd resistor；
Wherein, the resistance of the 3rd resistor is more than or equal to preset value, and correspondingly, the voltage variety of the electrochemical capacitor is less than
Equal to preset range.
7. current sampling circuit according to claim 5, it is characterised in that the backward voltage amplifying circuit includes the 4th
Resistance, the 5th resistance, the 6th resistance, the second comparator；Wherein,
4th resistance described in the first input end Jing of second comparator is connected to the ground, the second input of second comparator
5th resistance described in the Jing of end is connected between second crystal diode and 3rd resistor and the 6th resistance described in Jing is connected to
The outfan of second comparator.
8. current sampling circuit according to claim 7, it is characterised in that the output end yoke of second comparator goes out two
Bar branch road, wherein a branch road is connected to micro-control unit MCU, another branch road is connected to surging signal process circuit.
9. a kind of surge protection circuit, it is characterised in that the surge protection circuit is included described in any one of claim 1 to 8
Current sampling circuit, surging signal process circuit, the current sampling circuit is connected with the surging signal process circuit；Its
In,
The current sampling circuit is converted into the current signal for collecting after corresponding voltage dips signal, carries out signals reverse
And processing and amplifying and as current surge signal output to the surging signal process circuit；The surging signal process circuit root
The switching tube of the resonance circuit in the current sampling circuit is controlled according to the current surge signal, with to the resonance
Circuit carries out surge protection.
10. surge protection circuit according to claim 9, it is characterised in that the surging signal process circuit includes
Three comparators, surge controller；Wherein,
The first input end of the 3rd comparator is connected to the current sampling circuit, the second input of the 3rd comparator
End is connected to reference voltage, and the outfan of the 3rd comparator is connected to the surge controller；
The surge controller is connected with the switching tube of the resonance circuit, and the surge controller is according to the 3rd comparator
The signal of output is controlled to the switching tube of the resonance circuit.
11. surge protection circuits according to claim 10, it is characterised in that
3rd comparator compares the voltage of current surge signal when being higher than reference voltage, and the 3rd comparator is to described
Surge controller exports surge control signal so that the surge controller cuts out the switching tube of the resonance circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620977499.6U CN206060516U (en) | 2016-08-29 | 2016-08-29 | A kind of current sampling circuit and surge protection circuit |
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|---|---|---|---|
| CN201620977499.6U CN206060516U (en) | 2016-08-29 | 2016-08-29 | A kind of current sampling circuit and surge protection circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107800278A (en) * | 2016-08-29 | 2018-03-13 | 佛山市顺德区美的电热电器制造有限公司 | A kind of current sampling circuit and method, surge protection circuit and method |
| CN111244887A (en) * | 2020-03-05 | 2020-06-05 | 深圳市鑫汇科股份有限公司 | Protection circuit and surge detection method |
-
2016
- 2016-08-29 CN CN201620977499.6U patent/CN206060516U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107800278A (en) * | 2016-08-29 | 2018-03-13 | 佛山市顺德区美的电热电器制造有限公司 | A kind of current sampling circuit and method, surge protection circuit and method |
| CN107800278B (en) * | 2016-08-29 | 2023-11-24 | 佛山市顺德区美的电热电器制造有限公司 | Current sampling circuit and method, surge protection circuit and method |
| CN111244887A (en) * | 2020-03-05 | 2020-06-05 | 深圳市鑫汇科股份有限公司 | Protection circuit and surge detection method |
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