CN104965116A - Instrument electric quantity signal collection circuit board - Google Patents
Instrument electric quantity signal collection circuit board Download PDFInfo
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- CN104965116A CN104965116A CN201510367946.6A CN201510367946A CN104965116A CN 104965116 A CN104965116 A CN 104965116A CN 201510367946 A CN201510367946 A CN 201510367946A CN 104965116 A CN104965116 A CN 104965116A
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Abstract
The invention discloses an instrument electric quantity signal collection circuit board, comprising an input signal collection circuit; the input signal collection circuit is connected to a signal collection processing circuit; the input signal collection circuit consists of an input voltage signal collection circuit and an input current signal collection circuit; the input voltage signal collection circuit is constituted by a resistor voltage-dividing circuit and obtains -2.5-2.5V AC voltage through collecting; the input current signal collection circuit is constituted by a current mutual inductor and obtains -50mV-50mV AC current through collecting ; the inputted three-phase AC voltage signal collects AC voltage through the resistor voltage-dividing circuit; a following voltage follower has functions of buffering, insulation and improving loading capacity; the AC voltage is converted to 0-5V AC voltage through a summing circuit; a diode clamping circuit on the rear end of the circuit is used for realizing over-voltage protection on a single-chip microcomputer. The instrument electric quantity signal collection circuit board can perform processing on inputted three-phase AC voltage and current signals at the same time.
Description
Technical field
The present invention relates to information electronic technical field, particularly a kind of instrument electric quantity signal sampling circuit board.
Background technology
The instrument electric quantity signal sampling circuit board majority of current producer design adopts price voltage transformer (VT) costly and signal processing chip, considerably increases the cost of manufacture of electric quantity signal sampling circuit board.
Summary of the invention
Instant invention overcomes shortcoming of the prior art, provide a kind of low cost instrument electric quantity signal sampling circuit board, this instrument electric quantity signal sampling circuit board achieves the collection to three-phase alternating voltage and three-phase alternating current, and is finally treated to the discernible voltage range of single-chip microcomputer and is applied in KEM2000 type electric instrument.
In order to solve the problems of the technologies described above, the present invention is achieved by the following technical solutions:
A kind of instrument electric quantity signal sampling circuit board, it is characterized in that, comprise input signal Acquisition Circuit, described input signal Acquisition Circuit connects collection signal treatment circuit, and described input signal Acquisition Circuit is made up of input voltage signal Acquisition Circuit and input current signal Acquisition Circuit; Input voltage signal Acquisition Circuit is made up of resistor voltage divider circuit, collects-2.5 ~ 2.5V alternating voltage; Input current signal Acquisition Circuit is made up of current transformer, collects-50mV ~ 50mV alternating current;
Described collection signal treatment circuit is made up of voltage signal processing circuit and current signal treatment circuit, voltage signal processing circuit comprises the first buffer circuit, the first addition amplifying circuit, the second buffer circuit and the first clamp circuit, described first buffer circuit connects the first adding circuit, the second buffer circuit and the first clamp circuit successively, through the first adding circuit, be transformed to 0 ~ 5V alternating voltage; Described current signal treatment circuit comprises resistance change-over circuit, the second addition amplifying circuit, the 3rd buffer circuit and the second clamp circuit, described resistance change-over circuit connects the second addition amplifying circuit, the 3rd buffer circuit and the second clamp circuit successively, through being converted to 0 ~ 5V alternating voltage.The clamping diode circuit of circuit end is for realizing the overvoltage protection to single-chip microcomputer.
Preferably, the voltage follower that described first buffer circuit, the second buffer circuit and the 3rd buffer circuit are built by four-operational amplifier LM324 is respectively formed, and plays the effect of buffering, isolation, raising load capacity.Meanwhile, make the collection of each phase electric signal separate.Wherein, the first buffer circuit, the first addition amplifying circuit, the second buffer circuit use and realize with a slice LM324, and the second addition amplifying circuit, the 3rd buffer circuit use and realize with a slice LM324.
Compared with prior art, tool has the following advantages in the present invention:
This instrument electric quantity signal sampling circuit board provided by the invention, can carry out acquisition process to input three-phase alternating voltage, current signal simultaneously.The three-phase alternating voltage signal of input collects-2.5 ~ 2.5V alternating voltage through resistor voltage divider circuit; follow-up voltage follower plays the effect of buffering, isolation, raising load capacity; through adding circuit; be converted to 0 ~ 5V alternating voltage, the clamping diode circuit of circuit end is for realizing the overvoltage protection to single-chip microcomputer.Input three-phase alternating current signal is converted to small voltage signal through current transformer and sample resistance, through follow-up amplification, addition, follows, is transformed to 0 ~ 5V alternating voltage, can by single-chip microcomputer identifying processing.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the principle schematic of input voltage signal acquisition process circuit of the present invention.
Fig. 2 is the principle schematic of input current signal acquisition process circuit of the present invention.
Fig. 3 is the principle block diagram of input voltage signal acquisition process circuit of the present invention.
Fig. 4 is the principle block diagram of input current signal acquisition process circuit of the present invention.
Fig. 5 is voltage signal acquisition circuit diagram of the present invention.
Fig. 6 is current signal Acquisition Circuit figure of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not paying the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Below in conjunction with accompanying drawing 1-6 and specific embodiment, the present invention will be further described.
This instrument electric quantity signal sampling circuit board of the present invention, is mainly used in three-phase and four-line electric instrument.Three-phase voltage and current input signal, through this Acquisition Circuit, are converted to 0-5V ac voltage signal, can by single-chip microcomputer identifying processing.
As shown in Figure 1 and Figure 2, a kind of instrument electric quantity signal sampling circuit board of the present invention, is made up of voltage signal acquisition circuit, voltage signal processing circuit, current signal Acquisition Circuit and current signal treatment circuit.Introduce the composition of each major function block below in detail:
Voltage signal acquisition circuit
Input three-phase alternating voltage signal acquisition circuit is formed primarily of resistor voltage divider circuit, and as shown in Figure 5, wherein, Ua, Un are A phase input voltage signal to circuit diagram, and a1 is the alternating voltage within the scope of-2.5 ~ 2.5V of collecting through this circuit.
Voltage signal processing circuit
Voltage signal processing circuit comprises the first buffer circuit, the first addition amplifying circuit, the second buffer circuit and the first clamp circuit, and the first buffer circuit connects the first adding circuit, the second buffer circuit and the first clamp circuit successively.First buffer circuit, the second buffer circuit, the first addition amplifying circuit are respectively realized by a slice four-operational amplifier LM324, and the first clamp circuit then to be joined end to end realization by two switching diodes.
Current signal Acquisition Circuit
Input current signal Acquisition Circuit is made up of current transformer, and as shown in Figure 6, wherein, ia1, ia2 are A phase input current signal to circuit diagram, and a2 is the alternating voltage within the scope of-50mV ~ 50mV of being converted to through this circuit collection and through resistance.
Current signal treatment circuit
Current signal treatment circuit comprises resistance change-over circuit, the second addition amplifying circuit, the 3rd buffer circuit and the second clamp circuit, and resistance change-over circuit connects the second addition amplifying circuit, the 3rd buffer circuit and the second clamp circuit successively.Second addition amplifying circuit, the 3rd buffer circuit are realized by same a slice LM324, and the second clamp circuit then to be joined end to end realization by two switching diodes.
A kind of instrument electric quantity signal sampling circuit board provided by the invention, can carry out acquisition process to input three-phase alternating voltage, current signal simultaneously.The three-phase alternating voltage signal of input collects-2.5 ~ 2.5V alternating voltage through resistor voltage divider circuit; follow-up voltage follower plays the effect of buffering, isolation, raising load capacity; through adding circuit; be transformed to 0 ~ 5V alternating voltage, the clamping diode circuit of circuit end is for realizing the overvoltage protection to single-chip microcomputer.Input three-phase alternating current signal is converted to small voltage signal within the scope of-50mV ~ 50mV through current transformer and sample resistance, through follow-up amplification, addition, follows, is transformed to 0 ~ 5V alternating voltage.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (2)
1. an instrument electric quantity signal sampling circuit board, it is characterized in that, comprise input signal Acquisition Circuit, described input signal Acquisition Circuit connects collection signal treatment circuit, and described input signal Acquisition Circuit is made up of input voltage signal Acquisition Circuit and input current signal Acquisition Circuit; Input voltage signal Acquisition Circuit is made up of resistor voltage divider circuit, collects-2.5 ~ 2.5V alternating voltage; Input current signal Acquisition Circuit is made up of current transformer, collects-50mV ~ 50mV alternating current;
Described collection signal treatment circuit is made up of voltage signal processing circuit and current signal treatment circuit, voltage signal processing circuit comprises the first buffer circuit, the first addition amplifying circuit, the second buffer circuit and the first clamp circuit, described first buffer circuit connects the first adding circuit, the second buffer circuit and the first clamp circuit successively, through the first adding circuit, be transformed to 0 ~ 5V alternating voltage; Described current signal treatment circuit comprises resistance change-over circuit, the second addition amplifying circuit, the 3rd buffer circuit and the second clamp circuit, described resistance change-over circuit connects the second addition amplifying circuit, the 3rd buffer circuit and the second clamp circuit successively, through being converted to 0 ~ 5V alternating voltage.
2. a kind of instrument electric quantity signal sampling circuit board according to claim 1, it is characterized in that, the voltage follower that described first buffer circuit, the second buffer circuit and the 3rd buffer circuit are built by four-operational amplifier LM324 is respectively formed, wherein, first buffer circuit, the first addition amplifying circuit, the second buffer circuit use and realize with a slice LM324, and the second addition amplifying circuit, the 3rd buffer circuit use and realize with a slice LM324.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510367946.6A CN104965116A (en) | 2015-06-29 | 2015-06-29 | Instrument electric quantity signal collection circuit board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510367946.6A CN104965116A (en) | 2015-06-29 | 2015-06-29 | Instrument electric quantity signal collection circuit board |
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| CN104965116A true CN104965116A (en) | 2015-10-07 |
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| CN201510367946.6A Pending CN104965116A (en) | 2015-06-29 | 2015-06-29 | Instrument electric quantity signal collection circuit board |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6744391B2 (en) * | 2002-05-16 | 2004-06-01 | Schweitzer Engineering Laboratories | System for sampling a signal in an electronic instrument using a unipolar A/D converter |
| CN1654965A (en) * | 2005-03-04 | 2005-08-17 | 上海电器科学研究所（集团）有限公司 | Signal sampling circuit for electric quantity monitor |
| CN201145585Y (en) * | 2007-11-19 | 2008-11-05 | 河南索凌电气有限公司 | Voltage signal conditioning circuit |
| CN102914691A (en) * | 2012-10-19 | 2013-02-06 | 冶金自动化研究设计院 | Device with adaptive function and method for detecting three-phase alternating current voltage and current |
| CN203444012U (en) * | 2013-09-06 | 2014-02-19 | 国家电网公司 | High accuracy and rapid speed measurement circuit of wide range current in power system |
-
2015
- 2015-06-29 CN CN201510367946.6A patent/CN104965116A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6744391B2 (en) * | 2002-05-16 | 2004-06-01 | Schweitzer Engineering Laboratories | System for sampling a signal in an electronic instrument using a unipolar A/D converter |
| CN1654965A (en) * | 2005-03-04 | 2005-08-17 | 上海电器科学研究所（集团）有限公司 | Signal sampling circuit for electric quantity monitor |
| CN201145585Y (en) * | 2007-11-19 | 2008-11-05 | 河南索凌电气有限公司 | Voltage signal conditioning circuit |
| CN102914691A (en) * | 2012-10-19 | 2013-02-06 | 冶金自动化研究设计院 | Device with adaptive function and method for detecting three-phase alternating current voltage and current |
| CN203444012U (en) * | 2013-09-06 | 2014-02-19 | 国家电网公司 | High accuracy and rapid speed measurement circuit of wide range current in power system |
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Application publication date: 20151007 |
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| RJ01 | Rejection of invention patent application after publication |