CN203587675U - Integrated AD type singlechip microcomputer power AC sampling circuit - Google Patents
Integrated AD type singlechip microcomputer power AC sampling circuit Download PDFInfo
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- CN203587675U CN203587675U CN201320655170.4U CN201320655170U CN203587675U CN 203587675 U CN203587675 U CN 203587675U CN 201320655170 U CN201320655170 U CN 201320655170U CN 203587675 U CN203587675 U CN 203587675U
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Abstract
The utility model relates to an integrated AD type singlechip microcomputer power AC sampling circuit. The circuit is connected between the secondary output end of a current / voltage transformer and the AD port of a singlechip microcomputer and comprises a DC bias unit, a mutation large signal suppression unit and a low-pass filter. The DC bias unit of the circuit is composed of two equal resistors and one capacitor. The mutation large signal suppression unit of the power grid is composed of two diodes. The low-pass filter is composed of a resistor and a capacitor. In order to acquire multi-channel AC signals, the circuit is independently arranged on the upstream side of a signal conditioning part respectively, so that the integrity of AC signals to be acquired before the signal acquisition step is ensured. In this way, the above single circuit can be applied to varoius types of AC sampling circuits for integrated AD type singlechip microcomputers. Meanwhile, the circuit is low in price and wide in adaptability.
Description
technical field:
The utility model relates to a kind of circuit of integrated AD type single-chip microcomputer AC Electric Power sampling, for the AC signal of input AD integrated-type single-chip microcomputer is carried out to signal processing.
background technology:
Due to the singularity of power product use occasion, require product to there is good anti-emi characteristics (EMC); Tradition AD forms separately collection and the quantification of the signal to exchanging, and realize high EMC characteristic often needs to increase a lot of signal processing circuits.Along with single-chip microcomputer integrated level is more and more higher, being configured to of SOC (system on a chip) (SOC) is inevitable, but amplitude, the phase place of integrated AD type single-chip microcomputer to input exchange signal has certain requirement.AC signal must be carried out signal condition before entering the single-chip microcomputer of embedded AD, was therefore necessary the AC signal of input to nurse one's health.
Signal condition is mainly concerned with direct current biasing unit, electrical network sudden change large-signal suppresses unit and filter circuit:
1, direct current biasing, the technology such as special constant pressure source chip, amplifier feedback have been adopted in existing direct current biasing loop conventionally, often cost is higher, for AC sampling loop at least 6 passages, relate at most the collection of the AC signal of 24 passages, for preventing that Multi-channel crossed from disturbing, conventionally adopt the independent constant pressure source mode of every passage, cause cost higher.Single-chip microcomputer must not require and exceeded working power voltage requirement the peak-to-peak value of AC signal with the acquisition channel of AD, and most single-chip microcomputer consists of 5V or 3.3V, and best direct current biasing point exists
1/
2working power, so select the standard direct current constant pressure source of suitable 2.5V or 1.65V to become the link that circuit must be considered.If hyperchannel adopt direct current biasing point can be between channel input signal mutual cross influence.
2, electrical network sudden change large-signal suppresses, as the interchange acquisition circuit of power network, for electrical network, occur various during as faults such as short circuit, excess current, single-phase earthings current value suddenly change very large, primary current value often can arrive the rated current of 20 times, although once carried out magnetic saturation to secondary at the family curve of measuring mutual inductor, often also had at secondary side the sample magnitude that is several times as much as ratings; In carrying out the process of breaking-closing operating, power network easily causes the transient overvoltage of electrical network, its mathematical model is infinite impulse response, in actual motion, by oscillograph, detect and can reach the specified collection voltage magnitude of several times, so the collection of large-signal is often adopted to voltage stabilizing diode or vacuum tube, and TVS formation, element is connected across AC signal two ends and is illustrated in fig. 1 shown below:
Because circuit has utilized semi-conductive V/I curve characteristic and atmospherical discharges physical characteristics, there is unascertainable leakage current in these elements that are connected across secondary AC signal two ends, concerning AC measurment system, has increased quantization error.
3, filter circuit, the filter circuit of station-service generally adopts amplifier to carry out bandwidth filtering, its digital power of system and the analog power that for AD, are built in single-chip microcomputer adopt unified power supply ground connection on one point conventionally, to reduce Digital and analog, crosstalk, analog power is powered to amplifier, and routine needs dual power supply to silicon amplifier, such as relative 5V power supply, amplifier needs+2.5V and-2.5V, the amplifier characteristic of low-work voltage, price, procurement cycle are all cumbersome.
In prior art, a kind of schematic diagram of signal conditioning circuit as shown in Figure 1.Comprise voltage/current mutual inductor PT/CT, air discharge tube RH, stabilivolt D etc.
summary of the invention:
In view of prior art Shortcomings part, the utility model provides a kind of integrated AD type single-chip microcomputer AC Electric Power sample circuit, and it is applicable to and cooperating together with conventional CPU with AD.This circuit can carry out sample of signal, signal condition, protection inhibition and signal filtering to the interchange collection signal of electrical network, can make AC signal that MCU collects in true, perfect condition.
The purpose of this utility model realizes by following measures:
A kind of integrated AD type single-chip microcomputer AC Electric Power sample circuit, this circuit is connected between the output of current/voltage mutual inductor secondary and the AD port of single-chip microcomputer, comprises that direct current biasing unit, sudden change large-signal suppress unit and low-pass filter:
Described direct current biasing unit comprises capacitor C 2, resistance R 2 and resistance R 3; Sudden change large-signal suppresses unit and comprises diode D1 and diode D2; Low-pass filter consists of resistance R 1 and capacitor C 2.
Capacitor C 2 in described direct current biasing unit, resistance R 2 and resistance R 3 threes are joined with described current/voltage mutual inductor secondary output terminal one end simultaneously, another termination of capacitor C 2 and resistance R 2 in analog, resistance R 3 another termination analog powers.
In described sudden change large-signal inhibition unit, diode D1 positive pole and diode D2 negative pole connect the other end of described current/voltage mutual inductor output terminal simultaneously, and diode D1 negative pole connects analog power, and diode D2 positive pole connects in analog;
In described low-pass filter, one end of resistance R 1 and capacitor C 2 connects the AD input end of single-chip microcomputer simultaneously, and resistance R 1 other end connects respectively diode D1 positive pole and diode D2 negative pole, and capacitor C 1 another termination in analog.
Further design of the present utility model is: in direct current biasing unit, resistance R 2 is identical with resistance R 3 resistances.
Further design of the present utility model is also: diode D1 and diode D2 all select quick diode.
the utility model compared to existing technology tool has the following advantages:
1, the utility model relates to a kind of integrated AD type single-chip microcomputer alternating current sampling circuit.This circuit consists of direct current biasing unit, electrical network sudden change large-signal inhibition unit, low-pass filter, this circuit is connected in mutual inductor secondary output terminal and Chip Microcomputer A/D input end, this circuit direct current biasing is by equating that two resistance and an electric capacity form, electrical network sudden change large-signal consists of two diodes, low-pass filtering consists of resistance and electric capacity, before multichannel ac signal acquisition is independently laid in to signal condition by this circuit respectively, guarantee to exchange the integrality of collection signal before collection.Make an one circuit just can be adapted to the alternating current sampling circuit kind of polytype integrated AD single-chip microcomputer, there is cheap price, adaptability widely.
2, the utility model has changed mentality of designing in the past, simplicity of design, material cheapness, and realized high technical indicator.
3, direct current biasing unit major advantage is, no matter the error precision of R2 and R3 has muchly, and R2 and R3 have same physical and electrical characteristics, and the impact being produced by factors such as the variations of environment like this reduces to minimum.Concerning AC signal, the biasing of direct current is as long as stable signal source, and for changing by fast Fourier after single-chip microcomputer collection, DC component is directly rejected, and AC signal is had no effect.
4, sudden change electrical network large-signal inhibition unit major advantage is, on mutual inductor secondary AC signal without impact, by the output terminal at signal, increase the catching diode of power supply is reduced to the discrete impact of semi-conductive leakage current on signal, choosing of diode material had to pardon, choose fast signal diode and can meet the quick absorption of the transient energy that sign mutation is large.
5, the simple low-pass filtering of resistance-capacitance type, carries out suitable choosing for the bandwidth of wave filter, in addition by the impedance matching to AD input impedance, guarantees the integrality of signal in transmitting procedure.
accompanying drawing explanation:
Fig. 1 is the schematic diagram of signal conditioning circuit in prior art.
Fig. 2 is the schematic diagram of the integrated AD type of the utility model single-chip microcomputer AC Electric Power sample circuit.
embodiment:
Below in conjunction with accompanying drawing, the utility model is further described:
As shown in Figure 2, in the utility model, direct current biasing unit is by C2, R2, and R3 forms, the dividing potential drop that the voltage that A is ordered is R2.R3, R2 and R3 take same resistance value to obtain easily
1/
2working power voltage, C1 carries out filtering to magnitude of voltage, and no matter the error precision of R2 and R3 has muchly, and R2 and R3 have identical characteristics, and the factor impact such as the variation on environment reduces to minimum like this.Concerning AC signal, the biasing of direct current is as long as stable, and for changing by fast Fourier after single-chip microcomputer collection, DC component is directly rejected, and AC signal is had no effect.
Electrical network sudden change large-signal secondary side suppresses unit by D1; D2 forms; the forward voltage that is greater than D1 when the amplitude of positive half cycle exchanging and the difference of analog power for diode D1 waveform is directly suppressed by D1; port is protected; normal waveform loses without any waveform; the forward voltage that is greater than D2 when the amplitude of negative half period exchanging and difference in analog for diode D2 negative half waveform is directly suppressed by D2, thereby realization is carried out integrated protection to port.
Low-pass filter unit adopts by R1, and the low-pass filter that C2 forms, chooses appropriate bandwidth by the calculating to RC, adapt to electrical network often needs gather 31 subharmonic the waveform outside 1.65K frequency can filtering.In conjunction with AD input impedance, resistance is carried out to rational impedance matching.
Circuit has versatility in ac signal acquisition, and as long as integrated AD type single-chip microcomputer all uses, parameter does not need to adjust.
Claims (3)
1. an integrated AD type single-chip microcomputer AC Electric Power sample circuit, this circuit is for signal processing between current/voltage mutual inductor secondary output terminal and Chip Microcomputer A/D input port, comprise that direct current biasing unit, sudden change large-signal suppress unit and low pass filter unit, is characterized in that:
Described direct current biasing unit comprises capacitor C 2, resistance R 2 and resistance R 3; Sudden change large-signal suppresses unit and comprises diode D1 and diode D2; Low-pass filter consists of resistance R 1 and capacitor C 2;
Capacitor C 2 in described direct current biasing unit, resistance R 2 and resistance R 3 threes are joined with described current/voltage mutual inductor secondary output terminal one end simultaneously, another termination of capacitor C 2 and resistance R 2 in analog, resistance R 3 another termination analog powers;
In described sudden change large-signal inhibition unit, diode D1 positive pole and diode D2 negative pole connect the other end of described current/voltage mutual inductor secondary output terminal simultaneously, and diode D1 negative pole connects analog power, and diode D2 positive pole connects in analog;
In described low-pass filter, one end of resistance R 1 and capacitor C 2 connects the AD input end of single-chip microcomputer simultaneously, and resistance R 1 other end connects diode D1 positive pole and diode D2 negative pole simultaneously, and capacitor C 1 another termination in analog.
2. integrated AD type single-chip microcomputer AC Electric Power sample circuit according to claim 1, is characterized in that: in described direct current biasing unit, resistance R 2 is identical with resistance R 3 resistances.
3. integrated AD type single-chip microcomputer AC Electric Power sample circuit according to claim 2, is characterized in that: described diode D1 and diode D2 all select quick diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320655170.4U CN203587675U (en) | 2013-10-23 | 2013-10-23 | Integrated AD type singlechip microcomputer power AC sampling circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320655170.4U CN203587675U (en) | 2013-10-23 | 2013-10-23 | Integrated AD type singlechip microcomputer power AC sampling circuit |
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| CN203587675U true CN203587675U (en) | 2014-05-07 |
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| CN201320655170.4U Expired - Fee Related CN203587675U (en) | 2013-10-23 | 2013-10-23 | Integrated AD type singlechip microcomputer power AC sampling circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104793100A (en) * | 2015-05-13 | 2015-07-22 | 上海盛善电气有限公司 | Detection device for circuit breakage and short circuit of secondary coil of electric leakage mutual inductor |
-
2013
- 2013-10-23 CN CN201320655170.4U patent/CN203587675U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104793100A (en) * | 2015-05-13 | 2015-07-22 | 上海盛善电气有限公司 | Detection device for circuit breakage and short circuit of secondary coil of electric leakage mutual inductor |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140507 Termination date: 20181023 |
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| CF01 | Termination of patent right due to non-payment of annual fee |