CN2912065Y - Analogue capacity outputting device of motor protection device - Google Patents
Analogue capacity outputting device of motor protection device Download PDFInfo
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- CN2912065Y CN2912065Y CN 200620074143 CN200620074143U CN2912065Y CN 2912065 Y CN2912065 Y CN 2912065Y CN 200620074143 CN200620074143 CN 200620074143 CN 200620074143 U CN200620074143 U CN 200620074143U CN 2912065 Y CN2912065 Y CN 2912065Y
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Abstract
The utility model relates to an analog value output device of motor protector, which comprises a single chip microcomputer, a voltage or current conversion circuit,and also comprises a digital-analog conversion circuit, a signal isolation module, a RC filter module which are electrically connected with the digital-analog conversion circuit in turn, a pulse width modulation signal output terminal of the single chip microcomputer is electrically connected with a signal input terminal of the digital-analog conversion circuit, and the signal output terminal of the digital-analog conversion circuit is electrically connected with the signal input terminal of the voltage or current conversion circuit. The pulse width modulation signal output function of the single chip microcomputer can be utilized to perform digital-analog conversion and RC filtering for the pulse width modulation signal, so as to obtain the analog signal, then the voltage or current conversion is carried out to realize 4 to 20mA current output. The device has simple circuit structure, high measurement accuracy, and overall accuracy can reach two in a thousand; since D/A chip is not used in the circuit, cost of the device is reduced greatly.
Description
Technical field:
The utility model relates to a kind of analogue quantity output device of motor protection equipment, belongs to the motor protection field.
Background technology:
In the analogue quantity output device of motor protection equipment, obtain digital signal at present, finish of the conversion of single-chip microcomputer digital signal through this chip again to analog signal thereby adopt the D/A chip to be connected usually with eight I/O ports of single-chip microcomputer.The precision of D/A chip is divided into a plurality of grades, and the division of its grade is different and decide according to precision, and precision is high more, and the grade of D/A chip is high more, its price also expensive more.The full accuracy of current D/A chip can reach 2/1000ths, though it can satisfy the precision needs of analog quantity output in the motor protection field, expensive D/A chip has improved the cost of device.
Summary of the invention:
The purpose of this utility model, exactly in order to solve the above-mentioned defective of prior art, and the analogue quantity output device of the low motor protection equipment of a kind of certainty of measurement height, the cost that provide.
The purpose of this utility model can realize by following technical solution:
A kind of analogue quantity output device of motor protection equipment; form and comprise single-chip microcomputer, voltage; it is characterized in that: it also comprises D/A converting circuit; described D/A converting circuit is electrically connected successively by Signal Spacing module, RC filtration module to be formed; the pulse-width signal output of single-chip microcomputer is electrically connected with the signal input part of D/A converting circuit, and the signal output part of D/A converting circuit is electrically connected with the signal input part of voltage.
The purpose of utility model also can further realize by following technical measures:
The analogue quantity output device of aforesaid motor protection equipment; wherein said Signal Spacing module is formed and is comprised a triode Q1; a light lotus root D1; the pulse-width signal output of single-chip microcomputer inserts the base stage of described triode Q1 by the fixed resistance R1 of a series connection; the collector electrode of this triode Q1 is electrically connected with a fixed voltage U1 by a fixed resistance R2; the emitter of triode Q1 inserts No. 2 signal input parts of light lotus root D1; No. 3 signal input ground ground connection of described smooth lotus root D1; No. 8 power supply input terminals of light lotus root D1 are electrically connected an accurate voltage U2; No. 6 signal output parts of light lotus root D1 are electrically connected with above-mentioned accurate voltage U2 by the fixed resistance R3 of a series connection, No. 5 signal output ground ground connection of light lotus root D1.
The analogue quantity output device of aforesaid motor protection equipment; wherein said RC filtration module is a two-stage RC filter circuit; described two-stage RC filter circuit comprises an analog switch D2; the signal input channel control pin of this analog switch D2 is electrically connected with the signal output part of Signal Spacing module; the working power input pin of analog switch respectively with positive and negative fixed voltage U4; U3 is electrically connected; the place of working ground connection of analog switch D2; the signal output pin of analog switch D2 and two fixed resistance R4; the R5 series connection; also have two capacitor C 1 in the circuit; C2; described two capacitor C 1; the end of C2 respectively with these two series resistance R1; the signal output part of R2 is electrically connected, other end ground connection.The RC filter circuit also can adopt one-level RC filtering, promptly removes fixed resistance R5, capacitor C 2 in the circuit, and the signal output part of fixed resistance R4 is as the voltage output end Vout of D/A converting circuit.
The analogue quantity output device of aforesaid motor protection equipment; wherein said RC filtration module is a two-stage RC filter circuit; described two-stage RC filter circuit comprises a triode Q2; the base stage of this triode Q2 is electrically connected with the signal output part of Signal Spacing module; the grounded emitter of this triode Q2; the collector electrode of this triode Q2 is electrically connected with a fixed voltage U5 by a series resistance R6; the collector electrode of this triode Q2 and two fixed resistance R1 simultaneously; the R2 series connection; also have two capacitor C 1 in the circuit; C2; described two capacitor C 1; the end of C2 respectively with these two series resistance R1; the signal output part of R2 is electrically connected, other end ground connection.The RC filter circuit also can adopt one-level RC filtering, promptly removes fixed resistance R5, capacitor C 2 in the circuit, and the signal output part of fixed resistance R4 is as the voltage output end Vout of D/A converting circuit.
The analogue quantity output device of aforesaid motor protection equipment; wherein the series connection of the voltage input end of voltage inserts a voltage regulator circuit; described voltage regulator circuit comprises full scale to be regulated slide resistor SPAN and regulates slide resistor ZERO zero point; and operational amplifier D3A; the voltage input end of voltage regulator circuit is regulated slide resistor SPAN by full scale and is electrically connected with No. 2 negative input end of operational amplifier D3A; regulate slide resistor ZERO two ends zero point and apply positive and negative fixed voltage U6 respectively; U7; the tap of regulating slide resistor ZERO zero point is electrically connected with the signal output part that full scale is regulated slide resistor SPAN by fixed resistance R8; described positive fixed voltage U6 is electrically connected with the signal output part that full scale is regulated slide resistor SPAN by a fixed resistance R7; connect a fixed resistance R9 between No. 2 negative input end of described operational amplifier D3A and No. 1 lead-out terminal; this fixed resistance R9 two ends capacitor C 3 that inserts in parallel; No. 3 positive input terminal ground connection of operational amplifier D3A; No. 8 of operational amplifier D3A; No. 4 terminal applies positive and negative fixed voltage U8 respectively; U9, No. 1 signal output part of operational amplifier D3A is electrically connected with the voltage input end of conventional voltage/current converter circuit.
The beneficial effects of the utility model are as follows: changed traditional digital signal with the output of single-chip processor i/o port and changed by the D/A chip, obtain the signals collecting mode of analog signal, but utilize the pulse-width signal output function of single-chip microcomputer, thereby pulse-width signal is carried out Signal Spacing and RC filtering acquisition analog signal, again it is carried out the voltage/current conversion, realize the electric current output of 4-20mA.Device circuit is simple in structure, the certainty of measurement height, and overall accuracy can reach 2/1000ths; Owing to do not adopt the D/A chip in the circuit, thereby make the cost of device reduce greatly.
With reference to the accompanying drawings and in conjunction with the embodiments the utility model is described in further detail.But the utility model is not limited to given example.
Description of drawings:
Fig. 1 is the analogue quantity output device electricity theory diagram of the utility model motor protection equipment.
Fig. 2 is the D/A converting circuit principle schematic of the utility model embodiment 1.
Fig. 3 is the analogue quantity output device voltage principle schematic of the utility model motor protection equipment.
Fig. 4 is the D/A converting circuit principle schematic of the utility model embodiment 2.
Embodiment:
Example 1:
As shown in Figure 1; the analogue quantity output device of the utility model motor protection equipment; form and comprise single-chip microcomputer, voltage; it is characterized in that: it also comprises D/A converting circuit; described D/A converting circuit is electrically connected successively by Signal Spacing module, RC filtration module to be formed; the pulse-width modulation of single-chip microcomputer (PWM) signal output part is electrically connected with the signal input part of D/A converting circuit, and the signal output part of D/A converting circuit is electrically connected with the signal input part of voltage.
As shown in Figure 2, the Signal Spacing module is formed and is comprised a triode Q1 (model: 1815), a light lotus root D1 (model: 6N137), the pulse-width modulation of single-chip microcomputer (PWM) signal output part inserts the base stage of described triode Q1 by the fixed resistance R1 (10K Ω) of a series connection, the collector electrode of this triode Q1 by a fixed resistance R2 (499 Ω) and a fixed voltage U1 (+3.6V) be electrically connected, the emitter of triode Q1 inserts No. 2 signal input parts (ANODE) of light lotus root D1, No. 3 signal input ground (CATHODE) ground connection of described smooth lotus root D1, No. 8 power supply input terminals (VCC) the electrical connection one accurate voltage U2 of light lotus root D1 (+5V), No. 6 signal output parts (OUTPUT) of light lotus root D1 are electrically connected with above-mentioned accurate voltage U2 by the fixed resistance R3 (20K Ω) of a series connection, No. 5 signal output ground (GND) ground connection of light lotus root D1; The RC filtration module is a two-stage RC filter circuit, two-stage RC filter circuit comprises an analog switch D2 (model: CD4051), No. 11 signal input channel control pins of this analog switch D2 are electrically connected with No. 6 signal output parts (OUTPUT) of light lotus root D1,16 of analog switch D2, No. 13 pins and connect the back with voltage U 4 (+5V) be electrically connected, No. 7 pins of analog switch D2 (5V) are electrically connected with voltage U 3,6 of analog switch D2,8,9,10, No. 14 pin ground connection, No. 3 pins of analog switch D2 are as signal output part and two fixed resistance R4 (10K Ω), R5 (10K Ω) series connection, also have two capacitor C 1 (105pF) in the circuit, C2 (105pF), described two capacitor C 1, the end of C2 respectively with these two series resistance R4, the signal output part of R5 is electrically connected, other end ground connection.Signal is from pulse-width modulation (PWM) port of single-chip microcomputer, enter triode Q1 by fixed resistance R1, when signal satisfies certain shooting condition, current signal flows out from the emitter of triode Q1, enters No. 2 signal input parts (ANODE) of light lotus root D1, through the Signal Spacing of light lotus root D1, signal enters analog switch D2, when signal was low level, the signal input part of RC filter circuit was electrically connected with fixed voltage U4, capacitor C 1, C2 charging; Otherwise the signal input part ground connection of RC filter circuit when signal is high level, capacitor C 1, C2 discharge have been finished the filtering to signal like this, and signal have been exported as voltage signal.The RC filter circuit also can adopt one-level RC filtering, promptly removes fixed resistance R5, capacitor C 2 in the circuit, and the signal output part of fixed resistance R4 is as the voltage output end Vout of D/A converting circuit.
As shown in Figure 3; connect between the voltage input end Vin of the voltage of the analogue quantity output device of motor protection equipment and the traditional voltage (R10 left part among Fig. 3) and insert a voltage regulator circuit; this circuit comprises full scale to be regulated slide resistor SPAN (2K Ω) and regulates slide resistor ZERO (1000K Ω) zero point; and operational amplifier D3A (model: LM358); the voltage input end of voltage regulator circuit is regulated slide resistor SPAN by the Vin full scale and is electrically connected with No. 2 negative input end of operational amplifier D3A; regulate zero point slide resistor ZERO two ends apply respectively positive and negative fixed voltage U6 (+5V); U7 (5V); the tap of regulating slide resistor ZERO zero point is electrically connected with the signal output part that full scale is regulated slide resistor SPAN by fixed resistance R8 (1000K Ω); described positive fixed voltage U6 is electrically connected with the signal output part that full scale is regulated slide resistor SPAN by a fixed resistance R7 (100K Ω); connect a fixed resistance R9 (8.22K Ω) between No. 2 negative input end of described operational amplifier D3A and No. 1 lead-out terminal; this fixed resistance R9 two ends capacitor C 3 (104pF) that inserts in parallel; No. 3 positive input terminal ground connection of operational amplifier D3A; No. 8 of operational amplifier D3A; No. 4 terminals apply respectively positive and negative fixed voltage U8 (+15V); (5V), operational amplifier D3A No. 1 signal output part is electrically connected with the voltage input end of conventional voltage/current converter circuit U9.The voltage signal of D/A converting circuit output enters voltage, regulates through voltage regulator circuit, and the normal voltage of output 0-220V enters traditional voltage again and carries out the electric current and voltage conversion, realizes the electric current output of 4-20mA.
Traditional voltage among Fig. 3 (R10 right side part, comprise R10), fixed resistance R10 (20K Ω), R11 (10K Ω), R12 (49.9 Ω), R13 (1.5K Ω), R14 (49.9 Ω), fixed voltage U10 (+24V), U11 (+15V), U12 (5V), capacitor C 4 (104pF), C5 (104pF), C6 (104pF), C7 (103pF), operational amplifier D3B (model: LM358), triode Q3 (model: 1815), diode D3 (model: 1N4148).
Example 2:
As shown in Figure 4 among the embodiment, the RC filtration module is a two-stage RC filter circuit, two-stage RC filter circuit comprises a triode Q2 (model: 1815), the base stage of this triode Q2 is electrically connected with No. 6 signal output parts (OUTPUT) of light lotus root D1, the grounded emitter of this triode Q2, the collector electrode of this triode Q2 by a series resistance R6 (10K Ω) and a fixed voltage U5 (+5V) be electrically connected, the collector electrode of this triode and two fixed resistance R4 (10K Ω) simultaneously, R5 (10K Ω) series connection, also have two capacitor C 1 (105pF) in the circuit, C2 (105pF), described two capacitor C 1, the end of C2 respectively with these two series resistance R4, the signal output part of R5 is electrically connected, other end ground connection.The difference of present embodiment and example 1 only is that the analog switch among the embodiment 1 is replaced by triode, and circuit has been done suitable adjustment simultaneously, and the triode in analog switch in the example 1 and the present embodiment RC filter circuit has identical functions.Signal is from pulse-width modulation (PWM) port of single-chip microcomputer, enter triode Q1 by fixed resistance R1, when what signal satisfied certain shooting condition be, current signal flows out from the emitter of triode Q1, enter No. 2 signal input parts (ANODE) of light lotus root D1, Signal Spacing through light lotus root D1, signal enters the base stage of triode Q2, triode Q2 is output as high level when signal is low level, after otherwise triode Q2 is output as low level, the filtering of this voltage signal process RC filter circuit when signal is high level, export as voltage signal.The RC filter circuit also can adopt one-level RC filtering, promptly removes fixed resistance R5, capacitor C 2 in the circuit, and the signal output part of fixed resistance R4 is as the voltage output end Vout of D/A converting circuit.
In addition to the implementation, the utility model can also have other execution modes.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection range of the utility model requirement.
Claims (8)
1, the analogue quantity output device of motor protection equipment; form and comprise single-chip microcomputer, voltage; it is characterized in that: it also comprises D/A converting circuit; described D/A converting circuit is electrically connected successively by Signal Spacing module, RC filtration module to be formed; the pulse-width signal output of single-chip microcomputer is electrically connected with the signal input part of D/A converting circuit, and the signal output part of D/A converting circuit is electrically connected with the signal input part of voltage.
2; the analogue quantity output device of motor protection equipment according to claim 1; it is characterized in that: described Signal Spacing module is formed and is comprised a triode Q1; a light lotus root D1; the pulse-width signal output of single-chip microcomputer inserts the base stage of described triode Q1 by the fixed resistance R1 of a series connection; the collector electrode of this triode Q1 is electrically connected with a fixed voltage U1 by a fixed resistance R2; the emitter of triode Q1 inserts No. 2 signal input parts of light lotus root D1; No. 3 signal input ground ground connection of described smooth lotus root D1; No. 8 power supply input terminals of light lotus root D1 are electrically connected an accurate voltage U2; No. 6 signal output parts of light lotus root D1 are electrically connected with above-mentioned accurate voltage U2 by the fixed resistance R3 of a series connection, No. 5 signal output ground ground connection of light lotus root D1.
3; the analogue quantity output device of motor protection equipment according to claim 1; it is characterized in that: described RC filtration module is a two-stage RC filter circuit; described two-stage RC filter circuit comprises an analog switch D2; the signal input channel control pin of this analog switch D2 is electrically connected with the signal output part of Signal Spacing module; the working power input pin of analog switch respectively with positive and negative fixed voltage U4; U3 is electrically connected; the place of working ground connection of analog switch D2; the signal output pin of analog switch D2 and two fixed resistance R4; the R5 series connection; also have two capacitor C 1 in the circuit; C2; described two capacitor C 1; the end of C2 respectively with these two series resistance R1; the signal output part of R2 is electrically connected, other end ground connection.
4; the analogue quantity output device of motor protection equipment according to claim 1; it is characterized in that: described RC filtration module is a two-stage RC filter circuit; described two-stage RC filter circuit comprises a triode Q2; the base stage of this triode Q2 is electrically connected with the signal output part of Signal Spacing module; the grounded emitter of this triode Q2; the collector electrode of this triode Q2 is electrically connected with a fixed voltage U5 by a series resistance R6; the collector electrode of this triode Q2 and two fixed resistance R1 simultaneously; the R2 series connection; also have two capacitor C 1 in the circuit; C2; described two capacitor C 1; the end of C2 respectively with these two series resistance R1; the signal output part of R2 is electrically connected, other end ground connection.
5; the analogue quantity output device of motor protection equipment according to claim 1; it is characterized in that: described RC filtration module is an one-level RC filter circuit; described one-level RC filter circuit comprises an analog switch; the signal input channel control pin of this analog switch is electrically connected with the signal output part of Signal Spacing module; the working power input pin of analog switch respectively with positive and negative fixed voltage U4; U3 is electrically connected; the place of working ground connection of analog switch D2; the signal output pin of analog switch D2 is connected with a fixed resistance R4; also has a capacitor C 1 in the circuit; one end of described capacitor C 1 is electrically connected other end ground connection with the signal output part of this fixed resistance R4.
6; the analogue quantity output device of motor protection equipment according to claim 1; it is characterized in that: described RC filtration module is an one-level RC filter circuit; described one-level RC filter circuit comprises a triode Q2; the base stage of this triode Q2 is electrically connected with the signal output part of Signal Spacing module; the grounded emitter of this triode Q2; the collector electrode of this triode Q2 is electrically connected with a fixed voltage U5 by a series resistance R6; the collector electrode of this triode Q2 is connected with another fixed resistance R4 simultaneously; also has a capacitor C 1 in the circuit; one end of described capacitor C 1 is electrically connected other end ground connection with the signal output part of this fixed resistance R4.
7, the analogue quantity output device of motor protection equipment according to claim 1 is characterized in that: the voltage input end series connection of described voltage inserts a voltage regulator circuit.
8; the analogue quantity output device of motor protection equipment according to claim 7; it is characterized in that: described voltage regulator circuit comprises full scale to be regulated slide resistor SPAN and regulates slide resistor ZERO zero point; and operational amplifier D3A; the voltage input end of voltage regulator circuit is regulated slide resistor SPAN by full scale and is electrically connected with No. 2 negative input end of operational amplifier D3A; regulate slide resistor ZERO two ends zero point and apply positive and negative fixed voltage U6 respectively; U7; the tap of regulating slide resistor ZERO zero point is electrically connected with the signal output part that full scale is regulated slide resistor SPAN by fixed resistance R8; described positive fixed voltage U6 is electrically connected with the signal output part that full scale is regulated slide resistor SPAN by a fixed resistance R7; connect a fixed resistance R9 between No. 2 negative input end of described operational amplifier D3A and No. 1 lead-out terminal; this fixed resistance R9 two ends capacitor C 3 that inserts in parallel; No. 3 positive input terminal ground connection of operational amplifier D3A; No. 8 of operational amplifier D3A; No. 4 terminal applies positive and negative fixed voltage U8 respectively; U9, No. 1 signal output part of operational amplifier D3A is electrically connected with the voltage input end of conventional voltage/current converter circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620074143 CN2912065Y (en) | 2006-06-19 | 2006-06-19 | Analogue capacity outputting device of motor protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620074143 CN2912065Y (en) | 2006-06-19 | 2006-06-19 | Analogue capacity outputting device of motor protection device |
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| CN2912065Y true CN2912065Y (en) | 2007-06-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620074143 Expired - Lifetime CN2912065Y (en) | 2006-06-19 | 2006-06-19 | Analogue capacity outputting device of motor protection device |
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| CN (1) | CN2912065Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102110974A (en) * | 2010-06-17 | 2011-06-29 | 王静爽 | Explosion-proof type temperature intelligent control method for mining motor |
| CN103149960A (en) * | 2013-03-26 | 2013-06-12 | 山东大学 | High-precision adjustable type miniature current control circuit |
| CN108832929A (en) * | 2018-05-28 | 2018-11-16 | 重庆川仪自动化股份有限公司 | Low power consumption high-precision analog quantity isolation circuit |
-
2006
- 2006-06-19 CN CN 200620074143 patent/CN2912065Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102110974A (en) * | 2010-06-17 | 2011-06-29 | 王静爽 | Explosion-proof type temperature intelligent control method for mining motor |
| CN103149960A (en) * | 2013-03-26 | 2013-06-12 | 山东大学 | High-precision adjustable type miniature current control circuit |
| CN108832929A (en) * | 2018-05-28 | 2018-11-16 | 重庆川仪自动化股份有限公司 | Low power consumption high-precision analog quantity isolation circuit |
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| CX01 | Expiry of patent term |
Granted publication date: 20070613 |
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| EXPY | Termination of patent right or utility model |