CN103515927A - Electric leakage sampling circuit and method - Google Patents
Electric leakage sampling circuit and method Download PDFInfo
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- CN103515927A CN103515927A CN201310446251.8A CN201310446251A CN103515927A CN 103515927 A CN103515927 A CN 103515927A CN 201310446251 A CN201310446251 A CN 201310446251A CN 103515927 A CN103515927 A CN 103515927A
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Abstract
The invention discloses an electric leakage sampling circuit and a method. The circuit comprises a zero sequence current transformer J1, a signal processor T1, a first-level amplifying circuit U1A and a second-level amplifying circuit U1B, wherein the zero sequence current transformer J1 is used for inducing leakage currents, the signal processor T1 is used for processing the leakage currents to be an electric leakage signal, the first-level amplifying circuit U1A is used for carrying out first amplifying processing on the electric leakage signal to obtain a first amplifying signal and the second-level amplifying circuit U1B is used for carrying out second amplifying processing on the first amplifying signal to obtain a second amplifying signal. The electric leakage signal undergoes amplifying processing for two times, and accuracy, anti-interference capacity and stability of the electric leakage signal can be improved.
Description
Technical field
The present invention relates to sample circuit field, relate in particular to a kind of electric leakage sample circuit for the reclosing open-circuit system that leaks electricity.
Background technology
The protection device of electric leakage reclosing circuit breaker Chang Zuowei circuit.As shown in Figure 1, electric leakage reclosing circuit breaker generally comprises: the parts such as power supply, three-phase independence full-bridge, micro-control unit, current sampling circuit, voltage sampling circuit, electric leakage sample circuit, keystroke handling circuit, Graphics Processing circuit and protection output.Electric leakage sample circuit is a very important part in electric leakage reclosing circuit breaker.Electric leakage sample circuit can carry out acquisition and processing by electric leakage signal, and the micro-control unit that then electric leakage signal is outputed to electric leakage reclosing circuit breaker is analyzed, and plays the effect to the real-time monitoring of circuit.
The electric leakage sample circuit of existing electric leakage reclosing circuit breaker only has one-level to amplify processing after mostly being sampling, and this sample circuit precision is not high, poor anti jamming capability, and waveform is unstable.
Summary of the invention
In view of this, the invention provides a kind of electric leakage sample circuit, method and electric leakage reclosing open-circuit system, on the basis of the electric leakage sample circuit of original electric leakage reclosing open-circuit system, increased one-level amplification, from one-level, amplify and become secondary amplification, reach the object of the precision, antijamming capability and the stability that improve the electric leakage signal collecting.
On the one hand, the invention provides a kind of electric leakage sample circuit, described circuit comprises:
Zero sequence current mutual inductor J1 is used for responding to leakage current;
Signal processor T1 is for being processed into electric leakage signal by described leakage current;
First order amplifying circuit U1A, for described electric leakage signal is amplified to processing for the first time, obtains the first amplifying signal;
Second level amplifying circuit U1B, for described the first amplifying signal is amplified to processing for the second time, obtains the second amplifying signal.
Accordingly, the invention allows for a kind of electric leakage method of sampling, described method comprises:
Induction leakage current;
Described leakage current is processed into electric leakage signal;
Described electric leakage signal is carried out to the first order and amplify processing, obtain the first amplifying signal;
Described the first amplifying signal is carried out to the second level and amplify processing, obtain the second amplifying signal.
Accordingly, the invention allows for a kind of electric leakage reclosing open-circuit system, wherein, described electric leakage reclosing open-circuit system comprises the electric leakage sample circuit that any embodiment of the present invention provides.
The present invention proposes a kind of electric leakage sample circuit, method and electric leakage reclosing open-circuit system, can improve precision, antijamming capability and the stability of the electric leakage signal collecting.
Accompanying drawing explanation
Fig. 1 is the block diagram of electric leakage reclosing circuit breaker.
Fig. 2 is the structural representation of the electric leakage sample circuit that provides of first embodiment of the invention.
Fig. 3 is the realization flow figure of the electric leakage method of sampling that provides of second embodiment of the invention.
Embodiment
For the technical scheme of technical problem that the present invention is solved, employing and the technique effect that reaches clearer, below in conjunction with drawings and Examples, the present invention is described in further detail.Be understandable that, specific embodiment described herein is only for explaining the present invention, but not limitation of the invention.It also should be noted that, for convenience of description, in accompanying drawing, only show part related to the present invention but not full content.Below in conjunction with accompanying drawing and by embodiment, further illustrate technical scheme of the present invention.
Embodiment mono-
Fig. 2 is the structural representation of the electric leakage sample circuit that provides of first embodiment of the invention.As shown in Figure 2, the electric leakage sample circuit that the present embodiment provides comprises:
Zero sequence current mutual inductor J1.
In embodiments of the present invention, the first lead-out terminal of described zero sequence current mutual inductor J1 is connected with the anode of the second diode D2 with the first pole plate of described the first capacitor C1, the negative electrode of the first terminal of the first resistor R1, the first diode D1.The second output end ground connection of described zero sequence current mutual inductor J1.Described zero sequence current mutual inductor J1 is used for responding to leakage current.When having leakage current generating, in zero sequence current mutual inductor J1, just have leakage current and flow through.
Signal processor T1.
In embodiments of the present invention, described signal processor T1 comprises the first capacitor C1, the first resistor R1, the first diode D1 and the second diode D2 being connected in parallel, the first pole plate of wherein said the first capacitor C1, the first terminal of the first resistor R1, the negative electrode of the first diode D1 and the anodic bonding of the second diode D2 are to the first lead-out terminal of described zero sequence current mutual inductor J1, the second pole plate of described the first capacitor C1, the second terminal of the first resistor R1, the minus earth of the anode of the first diode D1 and the second diode D2.Described signal processor T1 is for being processed into electric leakage signal by described leakage current.In described zero sequence current mutual inductor J1, have leakage current through out-of-date, the first resistor R1 two ends can form voltage difference, and the first diode D1 and the second diode D2 have one all the time in conducting state, have one in cut-off state, play the effect of protective circuit.
First order amplifying circuit U1A.
In embodiments of the present invention, the in-phase input end ground connection of described first order amplifying circuit U1A, the inverting input of described first order amplifying circuit U1A is connected in the first pole plate of described the first capacitor C1 by the second resistor R2, the negative electrode of the first terminal of the first resistor R1, the first diode D1 and the anode of the second diode D2, and the output of described first order amplifying circuit U1A is connected in the anode of the 3rd diode D3.Described first order amplifying circuit U1A, for electric leakage signal is amplified to processing for the first time, obtains the first amplifying signal, and described the first amplifying signal is delivered to described second level amplifying circuit U1B.
Second level amplifying circuit U1B.
In embodiments of the present invention, the in-phase input end of described second level amplifying circuit U1B is connected to the negative electrode of described the 3rd diode D3, and by the 3rd resistor R3, be connected to the inverting input of described first order amplifying circuit U1A, the inverting input of described second level amplifying circuit U1B is by the 4th resistor R4 ground connection and by the output of the 5th resistor R5 connection and described second level amplifying circuit U1B.Described second level amplifying circuit U1B, for described the first amplifying signal is amplified to processing for the second time, obtains the second amplifying signal.
Embodiment bis-
Fig. 3 is the realization flow figure of the electric leakage method of sampling that provides of second embodiment of the invention.The present embodiment be take foregoing circuit as basis, and a kind of electric leakage method of sampling is provided, and the method for the present embodiment specifically comprises the steps:
301, induction leakage current.
In embodiments of the present invention, described zero sequence current mutual inductor J1 is used for responding to leakage current, when having leakage current generating, just has leakage current process in described zero sequence current mutual inductor J1.
302, described leakage current is processed into electric leakage signal.
Described signal processor T1 is for being processed into electric leakage signal by described leakage current.In described zero sequence current mutual inductor J1, just have leakage current through out-of-date, the first resistor R1 two ends of described signal processor T1 can form voltage difference, and the first diode D1 and the second diode D2 play the effect of protective circuit.
303, described electric leakage signal is carried out to the first order and amplify processing, obtain the first amplifying signal.
Described first order amplifying circuit U1A is for amplifying for the first time processing by electric leakage signal.The inverting input of described first order amplifying circuit U1A is received described electric leakage signal, described electric leakage signal being carried out to the amplification of the first order processes, obtain the first amplifying signal, and described the first amplifying signal is delivered to described second level amplifying circuit U1B by output.
304, described the first amplifying signal is carried out to the second level and amplify processing, obtain the second amplifying signal.
Described second level amplifying circuit U1B is for amplifying for the second time processing by described the first amplifying signal.The in-phase input end of described second level amplifying circuit U1B is received described the first amplifying signal that described first order amplifying circuit U1A transmits, and described the first amplifying signal is carried out to the amplification of the second level and processes, and obtains the second amplifying signal, and by the second amplifying signal output.
In addition, the second amplifying signal that amplify after processing the second level can be connected with micro-control unit MCU by RC circuit, after utilizing micro-control unit MCU to control described signal, then exports after described signal is added to conservation treatment.
Note, foregoing is only preferred embodiment of the present invention.Skilled person in the art will appreciate that and the invention is not restricted to specific embodiment described here, can carry out for a person skilled in the art various obvious variations, readjust and substitute and can not depart from protection scope of the present invention.Therefore, although the present invention is described in further detail by above embodiment, the present invention is not limited only to above embodiment, in the situation that not departing from the present invention's design, can also comprise more other equivalent embodiment, and scope of the present invention is determined by appended claim scope.
Claims (8)
1. an electric leakage sample circuit, is characterized in that, comprising: zero sequence current mutual inductor J1, signal processor T1, first order amplifying circuit U1A and second level amplifying circuit U1B, wherein,
Described zero sequence current mutual inductor J1 is used for responding to leakage current;
Described signal processor T1 is for being processed into electric leakage signal by described leakage current;
Described first order amplifying circuit U1A, for described electric leakage signal is amplified to processing for the first time, obtains the first amplifying signal;
Described second level amplifying circuit U1B, for described the first amplifying signal is amplified to processing for the second time, obtains the second amplifying signal.
2. electric leakage sample circuit according to claim 1, it is characterized in that, described signal processor T1 comprises: the first capacitor C1 being connected in parallel, the first resistor R1, the first diode D1 and the second diode D2, the first pole plate of wherein said the first capacitor C1, the first terminal of the first resistor R1, the anodic bonding of the negative electrode of the first diode D1 and the second diode D2 is to the first lead-out terminal of described zero sequence current mutual inductor J1, the second pole plate of described the first capacitor C1, the second terminal of the first resistor R1, the minus earth of the anode of the first diode D1 and the second diode D2.
3. electric leakage sample circuit according to claim 1, it is characterized in that, the in-phase input end ground connection of described first order amplifying circuit U1A, the inverting input of described first order amplifying circuit U1A is connected in the first pole plate of described the first capacitor C1 by the second resistor R2, the negative electrode of the first terminal of the first resistor R1, the first diode D1 and the anode of the second diode D2, and the output of described first order amplifying circuit U1A is connected in the anode of the 3rd diode D3.
4. electric leakage sample circuit according to claim 3, it is characterized in that, the in-phase input end of described second level amplifying circuit U1B is connected to the negative electrode of described the 3rd diode D3, and by the 3rd resistor R3, be connected to the inverting input of described first order amplifying circuit U1A, the inverting input of described second level amplifying circuit U1B is by the 4th resistor R4 ground connection and by the output of the 5th resistor R5 connection and described second level amplifying circuit U1B.
5. electric leakage sample circuit according to claim 4, is characterized in that, the output of described second level amplifying circuit U1B is transferred to micro-control unit by RC circuit by described the second amplifying signal.
6. electric leakage sample circuit according to claim 5, it is characterized in that, described RC circuit comprises the 6th resistor R6 and the 3rd capacitor C3, the first terminal of described the 6th resistor R6 is connected in the output of described second level amplifying circuit U1B, the first pole plate of described the 3rd capacitor C3 is connected in the second terminal of described the 6th resistor R6, the second pole plate ground connection of described the 3rd capacitor C3.
7. an electric leakage method of sampling, is characterized in that, comprising:
Induction leakage current;
Described leakage current is processed into electric leakage signal;
Described electric leakage signal is carried out to the first order and amplify processing, obtain the first amplifying signal;
Described the first amplifying signal is carried out to the second level and amplify processing, obtain the second amplifying signal.
8. an electric leakage reclosing open-circuit system; comprise: power supply, three-phase independence full-bridge, micro-control unit, current sampling circuit, voltage sampling circuit, electric leakage sample circuit, keystroke handling circuit, Graphics Processing circuit and protection output, is characterized in that the circuit described in any one claim that described electric leakage sample circuit comprises claim 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310446251.8A CN103515927A (en) | 2013-09-26 | 2013-09-26 | Electric leakage sampling circuit and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310446251.8A CN103515927A (en) | 2013-09-26 | 2013-09-26 | Electric leakage sampling circuit and method |
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| Publication Number | Publication Date |
|---|---|
| CN103515927A true CN103515927A (en) | 2014-01-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310446251.8A Pending CN103515927A (en) | 2013-09-26 | 2013-09-26 | Electric leakage sampling circuit and method |
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|---|---|
| CN (1) | CN103515927A (en) |
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2013
- 2013-09-26 CN CN201310446251.8A patent/CN103515927A/en active Pending
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Application publication date: 20140115 |