CN203054085U - Voltage frequency measuring device of high-voltage frequency converter - Google Patents
Voltage frequency measuring device of high-voltage frequency converter Download PDFInfo
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- CN203054085U CN203054085U CN 201320006778 CN201320006778U CN203054085U CN 203054085 U CN203054085 U CN 203054085U CN 201320006778 CN201320006778 CN 201320006778 CN 201320006778 U CN201320006778 U CN 201320006778U CN 203054085 U CN203054085 U CN 203054085U
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Abstract
The utility model relates to a voltage frequency measuring device of a high-voltage frequency converter. The voltage frequency measuring device comprises a preprocessing circuit (1), a voltage comparison circuit (2) and a frequency calculation circuit (4), wherein the preprocessing circuit (1) is used for inputting two paths of input voltages of the high-voltage frequency converter to the voltage comparison circuit (2) after rectification; and the voltage comparison circuit (2) is used for comparing the magnitude of the input voltages and outputting the results to the frequency calculation circuit (4) for calculating the frequency of input signals. The voltage frequency measuring device can be used for voltage frequency measurement.
Description
Technical field
The utility model relates to fields of measurement, especially relates to a kind of electric voltage frequency measurement mechanism of high voltage converter.
Background technology
In the Eleventh-Five Year Plan, building a conservation-minded society is an important content of Future Development.Effectively utilize the energy, energy savings is the imbody of building a conservation-minded society.
Motor is the power consumption rich and influential family who generally acknowledges, it accounts for more than 6 one-tenth of whole national economy power consumption, and it is carried out reducing energy consumption, has a high potential.Building a conservation-minded society, is the action that we must do.Wideling popularize variable-frequency control technique is the necessary means of realizing this goal, and it also is the focus of AC motor reducing energy consumption.
Along with developing rapidly of modern power electronics technology and Computer Control Technology, promoted the technological revolution of Electrified Transmission.AC speed regulating replaces DC speed regulation, and computer numerical control (CNC) replaces simulation control has become development trend.Ac motor speed control by variable frequency is current saves energy, improves the technological process of production, improve the quality of products, and a kind of main means of improving running environment.Frequency control is with its high-level efficiency, High Power Factor, and excellent speed governing and open plurality of advantages such as braking ability and be known as the most rising mode of speed regulation both at home and abroad.
In the high voltage converter field, monitor output frequency in real time and play an important role the in service of modern power systems.The methods such as the time interval of interior voltage waveform zero crossing number of unit of account time or measured waveform two adjacent zero crossings are generally adopted in AC signal frequency measurement now.Do as one likes can make frequency steadily glossily in 0Hz to 50Hz even the output of 100Hz scope by good frequency converter.And under lower frequency such as 3Hz frequency output condition, the humorous wave interference of electrical network is a quite harsh test to the accuracy of metering circuit.How resisting the humorous wave interference of electrical network, accurately calculate output voltage frequency under the low frequency state, is a big problem of converter technology development.
The utility model content
In order to solve the problems of the technologies described above, the utility model provides a kind of and is quick on the draw, real-time, anti-harmonic wave ability strong high, faster than phaselocked loop response speed, dynamic response is wide, the electric voltage frequency measurement mechanism of the high voltage converter of good stability.
The electric voltage frequency measurement mechanism of a kind of high voltage converter of the utility model comprises:
Pre-process circuit is used for two-way input voltage with high voltage converter after rectification, the input voltage comparator circuit;
Voltage comparator circuit is used for the relatively size of input voltage, and outputs to the frequency computation part circuit;
The frequency computation part circuit is used for calculating phase of input signals.
Further, as preferred version, described pre-process circuit further comprises: two voltage stabilizing diodes are connected on respectively on the two-way input voltage.
Further, as preferred version, between described voltage comparator circuit and frequency computation part circuit, increased a photoelectric isolating circuit.
Further, as preferred version, described pre-process circuit comprises two voltage followers and is connected on two-way input voltage input end respectively.
Further, as preferred version, described one of them voltage follower back connects a rectification circuit.
Compared with prior art, owing to adopt voltage follower, accurate full-wave rectification and comparator circuit, make the measurement of the utility model electric voltage frequency have and be quick on the draw that the real-time height, anti-harmonic wave ability is strong, faster than phaselocked loop response speed, dynamic response is wide, characteristics such as good stability.
Description of drawings
Fig. 1 is the specific embodiment theory diagram;
Fig. 2 is the specific embodiment circuit diagram.
Embodiment
Below in conjunction with drawings and Examples, embodiment of the present utility model is described in further detail.Following examples are used for explanation the utility model, but are not used for limiting scope of the present utility model.
Embodiment 1
As shown in Figure 1, the electric voltage frequency measurement mechanism of a kind of high voltage converter of present embodiment comprises:
Pre-process circuit 1 is used for two-way input voltage with high voltage converter after rectification, input voltage comparator circuit 2;
Voltage comparator circuit 2 is used for the relatively size of input voltage, and outputs to frequency computation part circuit 4.
Further, between described voltage comparator circuit 2 and frequency computation part circuit 4, increased a photoelectric isolating circuit 3.
Embodiment 2
As shown in Figure 2, obtain the two-way AC signal at this called after sampled voltage Uia and sampled voltage Uib by the sampling of frequency converter output voltage port.The voltage stabilizing diode of different voltage stabilized ranges is used in two-way sampling, make the sampled voltage Uia maximal value that obtains be+5V for+12V and sampled voltage Uib maximal value.Sampled voltage Uia and sampled voltage Uib obtain voltage signal Uia1 and voltage signal Uib1 through voltage follow.Voltage signal Uib1 is through precise rectification circuit, and this precise rectification circuit obtains current waveform in full-wave rectifier by becoming amplifier U3, U4, resistance R 1, R2, R3, R4 and R5, capacitor C 1 to constitute.It is to be quick on the draw in the difference of general circuit, the real-time height.
Sampled voltage Uia and sampled voltage Uib obtain Uia ' and Uib ' through arrangement, and inverting input and normal phase input end that these two signals enter amplifier U1 respectively compare.When Uia '＞Uib ', the 1 pin output low level of amplifier U1, on the contrary output high level, f1 show as certain and the pulse signal that the cycle changes of amplitude.Through the buffer action of optical coupler U6 (6N137), the pulse signal that characterizes output voltage frequency is sent to frequency computation part circuit 4 (microprocessor).
Use two LM348 chips in the circuit, wherein middle amplifier 1,2,3 and 4 is combined into a LM348, and amplifier 5 is road amplifier passages of another LM348.
Sampled voltage Uia enters 3 pin of amplifier U5, and 4 pin of amplifier U5 connect+15V, and 11 pin connect-15V, and 2 pin link to each other with 1 pin.1 pin of resistance R 6 one termination amplifier U5,2 pin of another termination amplifier U1.Sampled voltage Uib enters 5 pin of amplifier U2, and 6 pin of amplifier U2 link to each other with 7 pin.7 pin of resistance R 6 one termination amplifier U2,9 pin of another termination amplifier U3.7 pin of resistance R 4 one termination amplifier U2,13 pin of another termination amplifier U4.The 10 pin ground connection of amplifier U3.The anode of diode D1 connects 8 pin of amplifier U3, and negative electrode connects 9 pin of amplifier U3.The end of the anode connecting resistance R2 of diode D2, negative electrode connects 8 pin of amplifier U3, and the other end of resistance R 2 inserts 9 pin of amplifier U3.13 pin of one termination amplifier U4 of resistance R 3, the anode of another terminating diode D2.Capacitor C 1 and R5 parallel connection, 13 pin of a termination amplifier U4 of parallel circuit, 14 pin of another termination amplifier U4.14 pin of resistance R 7 one termination amplifier U4,3 pin of another termination amplifier U1.4 pin of amplifier U1 connect+15V, and 11 pin connect-15V.Resistance R 8 one terminations+15V, 1 pin of another termination amplifier U1.3 pin of one termination optical coupler U6 (6N137) of resistance R 9,1 pin of another termination amplifier U1.1 pin and 4 pin of optical coupler U6 (6N137) are unsettled, 2 pin connect+15V, 5 pin ground connection, 6 pin communicate with+5V through resistance R 10,6 pin and 7 pin receive simultaneously+the 5V power supply on, 6 pin of resistance R 11 1 termination optical coupler U6 (6N137), the output frequency signal f2 of the other end send frequency computation part circuit 4 (CPLD) chip to and carry out the data processing.
The above only is preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite that does not break away from the utility model know-why; can also make some improvement and modification, these improve and modification also should be considered as protection domain of the present utility model.
Claims (8)
1. the electric voltage frequency measurement mechanism of a high voltage converter is characterized in that, comprising:
Pre-process circuit (1) is used for two-way input voltage with high voltage converter after rectification, input voltage comparator circuit (2);
Voltage comparator circuit (2) is used for the relatively size of input voltage, and outputs to frequency computation part circuit (4);
Frequency computation part circuit (4) is for the frequency of calculating input signal.
2. according to the electric voltage frequency measurement mechanism of the described a kind of high voltage converter of claim 1, it is characterized in that: described pre-process circuit (1) further comprises: two voltage stabilizing diodes are connected on respectively on the two-way input voltage.
3. the electric voltage frequency measurement mechanism of a kind of high voltage converter according to claim 1 and 2 is characterized in that: increased a photoelectric isolating circuit (3) between described voltage comparator circuit (2) and frequency computation part circuit (4).
4. the electric voltage frequency measurement mechanism of a kind of high voltage converter according to claim 1, it is characterized in that: described pre-process circuit (1) comprises two voltage followers, and (U5 U2) is connected on two-way input voltage input end respectively.
5. the electric voltage frequency measurement mechanism of a kind of high voltage converter according to claim 4 is characterized in that: rectification circuit of described one of them voltage follower (U2) back connection.
6. the electric voltage frequency measurement mechanism of a kind of high voltage converter according to claim 5 is characterized in that: described voltage follower, rectification circuit and voltage comparator circuit (2) employing amplifier LM348 realization.
7. the electric voltage frequency measurement mechanism of a kind of high voltage converter according to claim 3 is characterized in that: described photoelectric isolating circuit (3) employing 6N137 realization.
8. the electric voltage frequency measurement mechanism of a kind of high voltage converter according to claim 1 is characterized in that: the realization of described frequency computation part circuit (4) employing CPLD programming device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320006778 CN203054085U (en) | 2013-01-08 | 2013-01-08 | Voltage frequency measuring device of high-voltage frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320006778 CN203054085U (en) | 2013-01-08 | 2013-01-08 | Voltage frequency measuring device of high-voltage frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203054085U true CN203054085U (en) | 2013-07-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320006778 Expired - Fee Related CN203054085U (en) | 2013-01-08 | 2013-01-08 | Voltage frequency measuring device of high-voltage frequency converter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104730317A (en) * | 2015-03-27 | 2015-06-24 | 武汉武新电气科技股份有限公司 | Output voltage and frequency detection circuit used for high-performance vector frequency converter |
-
2013
- 2013-01-08 CN CN 201320006778 patent/CN203054085U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104730317A (en) * | 2015-03-27 | 2015-06-24 | 武汉武新电气科技股份有限公司 | Output voltage and frequency detection circuit used for high-performance vector frequency converter |
| CN104730317B (en) * | 2015-03-27 | 2017-06-30 | 武汉武新电气科技股份有限公司 | A kind of output voltage and frequency detection circuit for high-performance vector frequency converter |
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Legal Events
| Date | Code | Title | Description |
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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: 20130710 Termination date: 20160108 |