CN101064480A - AC power source converting apparatus and method - Google Patents
AC power source converting apparatus and method Download PDFInfo
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- CN101064480A CN101064480A CN 200610140152 CN200610140152A CN101064480A CN 101064480 A CN101064480 A CN 101064480A CN 200610140152 CN200610140152 CN 200610140152 CN 200610140152 A CN200610140152 A CN 200610140152A CN 101064480 A CN101064480 A CN 101064480A
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Abstract
The invention discloses an alternating power source converting device which includes: direct power source unit which is used to transform the three phase alternating power source, and commutate to three path of low voltage direct current; input voltage detecting unit which is used to sample the voltage detecting signal of said three path of low voltage direct current; central control unit which is used to calculate the voltage value of said three phase alternating power source based on said voltage detecting signal, selecting a phase which fulfills the requirement mostly and outputting the conducting signal; output control unit which is used to output a phase which fulfills the requirement mostly according to said conducting signal. The invention also discloses an alternating power source converting method. When the three phase alternating power source is not stable, by detecting and comparing the voltage value of three phases alternating power source, selecting a phase which fulfills the requirement mostly to output for electric appliance which needs stable single phase alternating power source.
Description
Technical field
The present invention relates to field of power management, relate in particular to a kind of AC power source converting apparatus, the present invention provides a kind of AC power conversion method simultaneously.
Background technology
Electric energy is the most widely used energy, the use of electric energy is related to the various aspects of daily production, life.Present employed AC power generally has two kinds, i.e. three-phase alternating-current supply and single phase alternating current power supply, and wherein, industrial or commercial electricity consumption is generally three-phase alternating current, and household electricity is generally single-phase alternating current; Powerful electrical equipment generally uses three-phase alternating current, low power electrical equipment generally uses single-phase alternating current, but these do not have strict boundary at present, many industry or business site also need single phase poaer supply, high-power electric appliance and small-power electrical equipment need be used sometimes together, and this conveniently uses with regard to the device that needs three phase mains and be converted to single phase poaer supply.
Existing three-phase alternating-current supply is converted to the device of single phase alternating current power supply, in transformer, utilize the characteristic of the V-type and the I type mode of connection, with V-type and I type mode of connection applied in any combination high-low pressure winding to transformer, form the V/I mode of connection, three-phase alternating-current supply directly is converted to single phase alternating current power supply, satisfies the needs that three-phase alternating-current supply is converted to single phase alternating current power supply.
In actual applications; some local three-phase alternating-current supply voltages that use are very unstable; misphase, phase shortage, under-voltage situation usually appear; these faults are not all to occur simultaneously in three-phase; produce fault often just one in the three-phase be mutually or two-phase; and out of order one is not a certain phase of fixing with normal one mutually mutually, usually can change each other.If phase of one in the three-phase alternating-current supply or two-phase are had fault, simply convert single phase alternating current power supply to by said apparatus, the voltage of the single phase alternating current power supply that obtains must be unstable, so existing apparatus can not occur under misphase, phase shortage, the under-voltage situation at three-phase alternating-current supply, effectively utilize a normal phase in the three-phase alternating-current supply, stable single phase alternating current power supply is provided, uses for the electrical equipment that needs.
Three-phase voltage is all too high or too low in three-phase alternating-current supply, and existing apparatus can't effectively be controlled, and overtension or low excessively also appears in the single phase alternating current power supply of output thereupon, very easily the electrical equipment that uses out-put supply is caused unnecessary harm.
Summary of the invention
At above-mentioned defective, the invention provides a kind of AC power source converting apparatus, under the unsettled situation of three-phase alternating-current supply, can select the most satisfactory one output mutually, metastable single phase alternating current power supply is provided, use for the electrical equipment that needs.
The present invention also provides a kind of AC power conversion method, selects the most satisfactory one as single phase alternating current power supply output in three-phase alternating-current supply, and guarantees the stable, reliable of out-put supply.
AC power source converting apparatus provided by the invention comprises: DC power source unit, and being used for three-phase alternating-current supply transformation, rectification is three road low-voltage DCs;
The input voltage detecting unit is used for described three road low-voltage DCs are carried out the sampling of voltage detection signal;
Centralized control unit is used for calculating the magnitude of voltage of described each phase of three-phase alternating-current supply according to described voltage detection signal, selects the most satisfactory phase, and the output Continuity signal;
Output control unit is used for according to described Continuity signal, with described the most satisfactory one output mutually.
Wherein, also comprise: the phase angle detecting unit is used for described three road low-voltage DCs are sampled, and the phase angle detection signal of sampling is imported described centralized control unit;
Described centralized control unit is judged the sequential relationship between the described three-phase alternating-current supply three-phase according to this phase angle detection signal, and then has or not misphase, phase shortage in the judgement three-phase.
Wherein, also comprise: the output current detecting unit is used to detect the current value of output current, and the current value detection signal that is obtained is imported described centralized control unit;
Described centralized control unit calculates the current value of output current according to described current value detection signal, when this current value surpasses predetermined value, described centralized control unit output pick-off signal is to described output control unit, and described output control unit stops output according to this pick-off signal.
Wherein, also comprise: when output voltage was undesirable, described centralized control unit output pick-off signal was to described output control unit, and described output control unit stops output according to this pick-off signal; Described centralized control unit is reselected the most satisfactory phase in described three-phase alternating-current supply.
Wherein, also comprise: alarm unit, being used for, three-phase all undesirable at described three-phase alternating-current supply input voltage value has under misphase or phase shortage, the excessive situation of output current, reports to the police.
Wherein, described input voltage detecting unit is made up of three tunnel identical testing circuits of corresponding described three-phase alternating-current supply respectively, wherein a road be:
First resistance and second resistance polyphone, the first resistance other end connects the output of described power subsystem, the other end of second resistance inserts described centralized control unit by the 3rd resistance, also by the 4th grounding through resistance, first diode is in parallel with the 4th resistance, the first diode anode ground connection, negative electrode connects the common port of the second, the 4th resistance.
Wherein, described phase angle detecting unit by corresponding described three-phase alternating-current supply respectively, three tunnel identical circuit form, wherein one the tunnel is:
The 5th resistance one end connects the direct current output plus terminal of described DC power source unit, the other end connects the base stage of first triode, the grounded emitter of first triode, collector electrode connects the input of described centralized control unit, the 6th resistance in parallel and first electric capacity between the base stage of first triode and the emitter.
The present invention also provides a kind of AC power conversion method, comprising:
81), three-phase alternating-current supply transformation, the rectification with input is three road low-voltage dc power supplies;
82), described three road low-voltage dc power supplies are carried out the sampling of voltage detection signal;
83), according to this voltage detection signal, calculate the magnitude of voltage of described each phase of three-phase alternating-current supply, and select the most satisfactory one output mutually.
Wherein, it is characterized in that, with described step 82), 83) simultaneously, also carry out:
91), the rectifier output end by described three road low-voltage dc power supplies carries out the phase angle detection;
92), according to the phase angle testing result, judge the sequential relationship between the described three-phase alternating-current supply three-phase, and then judge in the three-phase and have or not misphase, phase shortage;
93), as if in the three-phase misphase, phase shortage are arranged, then warning.
101), when output voltage is undesirable wherein, also comprise:, stop output, and in described three-phase alternating-current supply, reselect the most satisfactory one output mutually.
A kind of AC power source converting apparatus provided by the invention compared with prior art has the following advantages:
1, can in three-phase alternating-current supply, select the most satisfactory one to export as single phase alternating current power supply:
Under the unsettled relatively situation of three-phase alternating-current supply, by detecting, compare the magnitude of voltage of each phase of three-phase alternating-current supply, select the most satisfactory one as single phase alternating current power supply output, offer the electrical equipment that needs the stabilized single phase AC power; And prior art just forms the V/I mode of connection by transformer height winding, and three-phase alternating-current supply directly is converted to single phase alternating current power supply, can not respectively select mutually three-phase alternating-current supply;
2, can guarantee the stable, reliable of out-put supply;
The present invention implements to detect to the magnitude of voltage of each phase of three-phase alternating-current supply of input, the phase angle between the three-phase, the magnitude of voltage and the current value of output single phase alternating current power supply, undesirable when the three-phase alternating-current supply while of input, or the single phase alternating current power supply voltage of output is excessive, too small, or the electric current of output is excessive, then, prevent from the electrical equipment that uses out-put supply is caused unnecessary harm by in time cutting off modes such as output, warning simultaneously; Prior art then can not be carried out any monitoring to input, out-put supply.
The present invention also provides a kind of AC power conversion method, by detecting, compare the magnitude of voltage of each phase of three-phase alternating-current supply, the most satisfactory one as out-put supply in the selection three-phase alternating-current supply, and by the monitoring to input power supply and out-put supply, guarantees that the power supply of exporting is stable, reliable.
Description of drawings
Fig. 1 is that the first embodiment of the invention functional unit concerns schematic diagram;
Fig. 2 is a second embodiment of the invention DC power source unit circuit diagram;
Fig. 3 is second embodiment of the invention input voltage detection cell circuit figure;
Fig. 4 is a second embodiment of the invention three-phase alternating-current supply oscillogram;
Fig. 5 is second embodiment of the invention phase angle detection cell circuit figure;
Fig. 6 is a rectifier bridge output voltage waveform in the second embodiment of the invention;
Fig. 7 is second embodiment of the invention output current detection cell circuit figure;
Fig. 8 is a second embodiment of the invention output control unit circuit diagram;
Fig. 9 is a second embodiment of the invention alarm unit circuit diagram;
Figure 10 is the second embodiment of the invention circuit diagram;
Figure 11 is a conversion method embodiment flow chart of the present invention.
Embodiment
Please referring to Fig. 1, for the first embodiment of the invention functional unit concerns schematic diagram, this embodiment is a key control unit with centralized control unit 101, detect each phase state of three-phase alternating-current supply of input by the software computing, select only one output phase as single phase alternating current power supply, and the output of automatic control power supply, guarantee that the single phase alternating current power supply of output meets the electrical equipment instructions for use.
Wherein, several big functional units are core with centralized control unit 101, and centralized control unit 101 calculates, judges, selects in the three-phase alternating-current supply only one to export as single phase alternating current power supply according to each functional unit input signal.
DC power source unit 102 is three road stabilizing low voltage DC power supply with three-phase alternating-current supply transformation, rectification, for input voltage detecting unit 103 and phase angle detecting unit 104 provide sampled signal, also provide operating voltage for centralized control unit 101, output current detecting unit 105, output control unit 106 and alarm unit 107.
Input voltage detecting unit 103 carries out the sampling of voltage detection signal with three road low-voltage DCs that DC power source unit 102 provides, and voltage detection signal imported centralized control unit 101, centralized control unit 101 calculates the magnitude of voltage of each phase of three-phase alternating-current supply, and relatively, select the most satisfactory phase, the output Continuity signal, output control unit 106 is with its output.
Phase angle detecting unit 104 will be used for described three road low-voltage DCs are sampled, and with the sampling the phase angle detection signal import described centralized control unit 101, centralized control unit 101 is according to this phase angle detection signal, judge the sequential relationship between the described three-phase alternating-current supply three-phase, and then have or not misphase, phase shortage in the judgement three-phase.
Output current detecting unit 105 is used to detect the current value of output current, and with the current value detection signal input centralized control unit 101 that is obtained, centralized control unit 101 calculates the current value of output current according to described current value detection signal, when this current value surpasses predetermined value, centralized control unit 101 output pick-off signals are to output control unit 106, and output control unit 106 stops output according to this pick-off signal.
The part of second embodiment of the invention is identical with first embodiment, and second embodiment further provides the concrete built-up circuit of each functional unit.
See also Fig. 2, be second embodiment of the invention DC power source unit circuit diagram.The input power supply is a three-phase alternating-current supply, divides L1, L2, L3, N four lines, wherein L1, L2, L3 three-way in arbitrary line-to-line voltage be 380V, the voltage during L1, L2, L3 are three-way between arbitrary line and N line is 220V.L1, L2, three-way linear transformer T1, T2, the elementary anode of T3 imported respectively of L3, N line wiring transformer T1, the elementary negative terminal of T2, T3.
Be that example is elaborated mutually now with L1 line and N line one.The coil ratio of linear transformer T1 primary and secondary is 55/3, and when elementary input voltage was 220V, secondary output voltage was 12V, and 21,23 of linear transformer T1 time level two ends and splicing ear CN6 link to each other.Like this, by linear transformer T1, the alternating current of 220V is converted to the low-voltage AC of 12V.
21,23 of splicing ear CN6 are continuous with rectifier bridge two inputs 24,26, rectifier bridge is connected to form in turn by VD6, VD7, four diodes of VD8, VD9, rectifier bridge direct current output negative pole end points 25 ground connection, direct current output cathode end points 27 connects the diode VD5 anode that is used to isolate, the negative electrode of VD5 connects an end and the anode that polar capacitor E3 is arranged, the other end of capacitor C 6 and the negativing ending grounding that polar capacitor E3 is arranged of capacitor C 6.The anode of diode VD4 connects diode VD5 negative electrode, and negative terminal connects the input of three-terminal voltage-stabilizing pipe IC2.
Described capacitor C 6 and have the effect of polar capacitor E3 to be to export to such an extent that galvanic 12V direct current carries out flat ripple, filtering to described rectifier bridge is converted to more stable 12V direct current, again by diode VD4 input three-terminal voltage-stabilizing pipe IC2.Diode VD4 is used to prevent phase mutual interference between three road 12V power supplys, plays buffer action.
The L2 line is mutually identical with this with N line, L3 line and N line two-phase transfer process, and three road 12V positive sources connect the input of three-terminal voltage-stabilizing pipe IC2 jointly, and three-terminal voltage-stabilizing pipe IC2 is stable 5V voltage with the 12V voltage transitions, exports at output.The earth terminal ground connection of three-terminal voltage-stabilizing pipe IC2, input connects an end of capacitor C 7 and the anode of polar capacitor E4 is arranged, output connects the end of capacitor C 8, C9 and the anode of polar capacitor E5, E7 is arranged, the other end of capacitor C 7, C8, C9 and the negativing ending grounding of polar capacitor E4, E5, E7 is arranged.
DC power source unit is pressed the three-phase alternating current conversion for low-voltage AC by three linear transformers, converts low-voltage DC to by rectification circuit and filter circuit again, converts thereof into the required burning voltage of circuit by the three-terminal voltage-stabilizing pipe then.As the input of three-terminal voltage-stabilizing pipe, like this, as long as have one electricity is arranged mutually in the three-phase alternating current, but circuit is with regard to operate as normal jointly for three road low-voltage DCs that are converted to.
See also Fig. 3, be second embodiment of the invention input voltage detection cell circuit figure.12V voltage is by the A/D interface of divider resistance R14, R15, R16, R19 input centralized control unit among the DC power source unit embodiment.Wherein resistance R 14 is contacted with R15, and the anode of resistance R 14 another terminating diode VD4, resistance R 15 other ends also insert the A/D end of convert of centralized control units by resistance R 16 ground connection by resistance R 19.Voltage stabilizing didoe WY3 is in parallel with resistance R 16, the plus earth of voltage stabilizing didoe WY3, and negative electrode links to each other with resistance R 16 1 ends.
Voltage stabilizing didoe WY3 can prevent that test point voltage that factor such as surge causes is higher than the operating voltage of centralized control unit, and centralized control unit is caused damage, and guarantees centralized control unit safety, operate as normal.
Centralized control unit is extrapolated and corresponding L1 line of this road voltage and the accurate mutually magnitude of voltage of N line one according to the turn ratio of the primary and secondary coil of the resistance value ratio of detected voltage, resistance R 16 and R14 and R15, linear transformer.The L2 line is handled with N line, L3 line and N line two-phase, the reckoning process is mutually identical with L1 line and N line one.
After three road low-voltage DCs that the input voltage detecting unit is converted to DC power source unit carry out respective handling, the input centralized control unit, centralized control unit is by detecting the magnitude of voltage of three road low-voltage DCs, extrapolate the input voltage of each phase of three-phase alternating-current supply, thereby draw three-phase voltage characteristic separately in the three-phase alternating-current supply.
See also Fig. 4, be second embodiment of the invention three-phase alternating-current supply oscillogram.Wherein, abscissa is the time waveform operation angle, and ordinate is a magnitude of voltage, and the electrical degree between U, V, the W three-phase is 120 degree, and the electrical degree of zero crossing is spaced apart 60 degree.By detecting the time interval of three-phase zero crossing, obtain the sequential relationship of three-phase, and then judge whether misphase or phase shortage are arranged in the three-phase.
See also Fig. 5, be second embodiment of the invention phase angle detection cell circuit figure.Circuit bridge direct current output plus terminal 27 passes through the base stage that divider resistance R18 connects triode DQ3 in the DC power source unit embodiment circuit diagram, the grounded emitter of triode DQ3, and collector electrode connects the input of centralized control unit.Parallel resistance R17 and shunt capacitance C9 between the base stage of triode DQ3 and the emitter.
See also Fig. 6, be rectifier bridge output voltage waveform in the second embodiment of the invention.Wherein, abscissa is the waveform operation angle, and ordinate is a magnitude of voltage.When voltage is higher than U1, triode DQ3 conducting, centralized control unit test side ground connection, the test side detects low level; When voltage equaled U1, promptly during the waveform pass zero point of this phase, triode DQ3 ended, and centralized control unit detects the disconnected high level that detects.
The L2 line is handled with N line, L3 line and N line two-phase, testing process is mutually identical with L1 line and N line one.Centralized control unit detects the time that high potential appears in three-phase successively, obtains the time interval of three-phase zero crossing, according to time of three-phase zero crossing whether be even cross occurrence, judge that three-phase alternating-current supply has misphase; In detecting signal, if having one not occur high level mutually, centralized control unit judges that then this is phase shortage mutually.
The phase angle detecting unit will be from the low-voltage DC of the rectification circuit of DC power source unit output, be processed into high low-potential signal input centralized control unit test side, by detecting the zero cross signal of each phase of three-phase alternating-current supply, extrapolate three alternate phase relations, and then judge whether three-phase alternating-current supply has misphase, phase shortage.
See also Fig. 7, be second embodiment of the invention output current detection cell circuit figure.AC mutual induction coil CT1 passes through two end points P6, P7 snap rings around the electric current line of exporting, the output of AC mutual induction coil CT1 connects two inputs, 71,73 ends of rectifier bridge, this rectifier bridge is connected to form in turn by VD22, VD24, four diodes of VD25VD23, this rectifier bridge with the induced electricity shaping of AC mutual induction coil CT1 input after by the output of direct current output plus terminal 72 ends, the direct current output negative terminal 74 end ground connection of this rectifier bridge.Rectifier bridge direct current output plus terminal 72 connects an end of resistance R 27, and resistance R 27 inserts the A/D input of centralized control unit by resistance R 22.Be connected the 5V power supply by diode VD26 between R27 and R22, the anode of diode VD26 connects the 5V power supply, and negative electrode links to each other with R22 with R27, between R27 and R22 also by resistance R 26 ground connection.Pass through capacitor C 15 ground connection between resistance R 22 and the centralized control unit A/D input.
Diode VD26 prevents that the voltage that detects is higher than the operating voltage of centralized control unit, causes damage to it.The characteristic of centralized control unit by detected size of current, AC mutual induction coil CT1, resistance R 27 and the resistance ratio of resistance R 26 are extrapolated the size of output current, judge whether output current meets the requirements.
The output current detecting unit detects output current by D.C mutual-inductor, and with detected current signal input centralized control unit, centralized control unit calculates the size of output current, and then judges whether output current meets the requirements.
See also Fig. 8, be second embodiment of the invention output control unit circuit diagram.The output of centralized control unit is connected to the base stage of triode DQ6 by resistance R 38, the grounded emitter of triode DQ6, collector electrode connects the 12V positive source by the two ends 81,84 of resistance R 1, power relay RL1 coil, and the output 82,83 of power relay RL1 connects the L1 line and the N line of three-phase input power supply.Power relay RL1 coil is in parallel with diode VD1, and the anode of diode VD1 connects with R1, and negative electrode links to each other with the 12V power supply.
The catenation principle of power relay RL2, power relay RL3 is identical with power relay RL1, wherein, power relay RL2 output connects the L2 line and the N line of three-phase input power supply, and power relay RL3 output connects the L3 line and the N line of three-phase input power supply.
If centralized control unit is judged in the three-phase input power supply this optimum mutually of L1 and N line, then put high level at this corresponding output, triode DQ6 conducting thereupon, the 12V power supply is by power relay RL1, resistance R 1, triode DQ6 earth-continuity, power relay RL1 is in the adhesive conducting state, the L1 of the three-phase input power supply output that is conducted.
Output control unit is exported a certain of three-phase alternating-current supply by control relay as out-put supply.Centralized control unit selects the most satisfactory one by output control unit control output by three-phase input power source voltage is detected.
If the three-phase alternating-current supply of input is all undesirable, output control unit turn-offs all power relays according to the instruction of centralized control unit, stops output; If overtension or low excessively appears in out-put supply, output control unit just makes in running order relay disconnect, and centralized control unit is judged the state of each phase of three-phase alternating-current supply of input, reselects only one mutually as the output phase; Exceed predefined scope if current detecting unit detects output current, centralized control unit then turn-offs all power relays, stops output.
See also Fig. 9, be second embodiment of the invention alarm unit circuit diagram.Centralized control unit four tunnel outputs are connected with the 5V power supply with light-emitting diode by resistance, and wherein, an output is by the negative electrode of resistance R 34 connection LEDs 4, and the anode of LED 4 connects the 5V power supply.Other catenation principle of three tunnel is identical with this road, and wherein, LED 1, LED2, LED3, LED4 represent that respectively overvoltage/undervoltage is reported to the police, phase shortage is reported to the police, misphase is reported to the police and overcurrent is reported to the police.
Three-phase voltage is all too high or too low in the three-phase alternating current that detects input, and centralized control unit is in the corresponding output end output low level, and LED 4 conductings are luminous, and caution voltage occurs too high or too low.Detecting in the three-phase alternating current of input has misphase, phase shortage or output current excessive, and the principle of warning is with overtension or to cross low alarm principle identical.
See also Figure 10, be the second embodiment of the invention circuit diagram, this circuit is made up of above-mentioned each functional unit.Centralized control unit is single-chip microcomputer IC1, single-chip microcomputer IC1 receives the voltage signal of input voltage detecting unit, the transmission of output current detecting unit by the A/D input interface, receive the high low-potential signal of phase angle testing circuit input by the input termination, single-chip microcomputer IC1 internal processes carries out calculation process to these signals, by detecting the magnitude of voltage of the every phase of three-phase alternating-current supply, select voltage the most satisfactory one to export by output control unit.
When three-phase alternating-current supply appearance fluctuation, one of selection is not an optimum phase time mutually, and single-chip microcomputer IC1 in time adjusts, and selects optimum one again and fails mutually.Single-chip microcomputer IC1 detects output current by the output current detecting unit, and the electric current of output is excessive, and single-chip microcomputer IC1 can cut off output automatically and report to the police; Simultaneously excessive or too small when the input three-phase current, single-chip microcomputer IC1 cuts off output automatically and reports to the police; In the three-phase alternating-current supply of input abnormal conditions such as misphase, phase shortage are arranged, single-chip microcomputer IC1 reports to the police, and guarantees that the power supply of exporting is stable, reliable.
The present invention by detecting, compare the magnitude of voltage of each phase of three-phase alternating-current supply, selects the most satisfactory one as single phase alternating current power supply output under the unsettled relatively situation of three-phase alternating-current supply, offer the electrical equipment that needs the stabilized single phase AC power.
The present invention implements to detect to the magnitude of voltage of each phase of three-phase alternating-current supply of input, the phase angle between the three-phase, the magnitude of voltage and the current value of output single phase alternating current power supply, undesirable when the three-phase alternating-current supply while of input, or the single phase alternating current power supply voltage of output is excessive, too small, or the electric current of output is excessive, then, prevent from the electrical equipment that uses out-put supply is caused unnecessary harm by in time cutting off modes such as output, warning simultaneously.
The present invention also provides a kind of AC power conversion method, selects the most satisfactory phase conduct output phase in the three-phase alternating-current supply, and guarantees the stable, reliable of out-put supply.
See also Figure 11, be conversion method one embodiment flow chart of the present invention, concrete steps are:
Step S1101 is three road low-voltage dc power supplies with three-phase alternating-current supply transformation, rectification; With three-phase alternating-current supply is low-voltage alternating current power supply by three linear transformer transformations respectively, regulate the turn ratio of transformer input and output end-coil, can obtain the low-voltage AC of needs, pass through the rectification circuit rectification again, convert comparatively stable low-voltage DC after the filter circuit filtering to;
Step S1102 carries out phase angle detection signal sampling to described three road low-voltage dc power supplies, according to this phase angle detection signal, judges the sequential relationship between the described three-phase alternating-current supply three-phase, and then has or not misphase, phase shortage in the judgement three-phase;
To the electric current after the rectification circuit rectification being carried out phase angle detection signal sampling, with the base stage of phase angle detection signal input triode, transistor collector connects single-chip microcomputer test side, grounded emitter; Three-phase zero crossing in the three-phase alternating-current supply 60 degree of being separated by are voltage signal at the parallactic angle detection signal of rectification circuit sampling, the Cheng Banbo waveform, and when voltage is in non-minimum point, the triode conducting, single-chip microcomputer test side ground connection detects electronegative potential; When voltage is in minimum point, when promptly crossing waveform pass zero point, triode ends, and single-chip microcomputer detects high level; Single-chip microcomputer is extrapolated sequential relationship between each phase of three-phase alternating-current supply, and then is judged that three-phase alternating-current supply has or not misphase, phase shortage phenomenon according to the high-low level signal that detects;
Step S1103 carries out the sampling of voltage detection signal to three road low-voltage dc power supplies, according to this voltage detection signal, calculates the magnitude of voltage of described each phase of three-phase alternating-current supply, and selects the most satisfactory phase;
Described three road low-voltage dc power supplies are carried out the sampling of voltage detection signal, and voltage detection signal is imported single-chip microcomputer, single-chip microcomputer is according to the magnitude of voltage of each phase of voltage signal calculating place three-phase alternating-current supply, and the most satisfactory phase of selection;
Step S1104, whether detection is just having power supply output, then detects whether arrive delay time, then exports as single-phase out-put supply the most satisfactory one to delay time; Then do not return step S1102 to delay time; Whether the voltage that has power supply output then to detect out-put supply meets the requirements;
Step S1105 if this phase voltage is too high or too low, then disconnects output, warning, initialization time register, and returns step S1102; Whether if this phase voltage is normal, it is excessive then to detect output current; The power supply of output is the phase of input in the three-phase alternating-current supply, by to the detection of the input supply voltage voltage of out-put supply as can be known just;
Step S1106 if output current is excessive, then disconnects output, warning, initialization time register, and returns step S1102; If output current is normal, then detect whether phase shortage of this phase;
It is that a current sensing means is set on the output current line that output current detects, and with the input of detected induced current input single-chip microcomputer, single-chip microcomputer can be extrapolated the output current size according to this induced current;
Step S1107 if phase shortage appears in output mutually, then disconnects output, warning, initialization time register, and returns step S1102; If be somebody's turn to do not phase shortage of phase, then return step S1102.
AC power conversion method of the present invention, by detecting, compare the magnitude of voltage of each phase of three-phase alternating-current supply, the most satisfactory one as out-put supply in the selection three-phase alternating-current supply, and by the monitoring to input power supply and out-put supply, guarantees that out-put supply is stable, reliable.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1, a kind of AC power source converting apparatus is characterized in that, comprising:
DC power source unit, being used for three-phase alternating-current supply transformation, rectification is three road low-voltage DCs;
The input voltage detecting unit is used for described three road low-voltage DCs are carried out the sampling of voltage detection signal;
Centralized control unit is used for calculating the magnitude of voltage of described each phase of three-phase alternating-current supply according to described voltage detection signal, selects the most satisfactory phase, and the output Continuity signal;
Output control unit is used for according to described Continuity signal, with described the most satisfactory one output mutually.
2, device according to claim 1 is characterized in that, also comprises:
The phase angle detecting unit is used for described three road low-voltage DCs are sampled, and the phase angle detection signal of sampling is imported described centralized control unit;
Described centralized control unit is judged the sequential relationship between the described three-phase alternating-current supply three-phase according to this phase angle detection signal, and then has or not misphase, phase shortage in the judgement three-phase.
3, device according to claim 1 is characterized in that, also comprises:
The output current detecting unit is used to detect the current value of output current, and the current value detection signal that is obtained is imported described centralized control unit;
Described centralized control unit calculates the current value of output current according to described current value detection signal, when this current value surpasses predetermined value, described centralized control unit output pick-off signal is to described output control unit, and described output control unit stops output according to this pick-off signal.
4, according to claim 1,2 or 3 described devices, it is characterized in that, also comprise:
When output voltage was undesirable, described centralized control unit output pick-off signal was to described output control unit, and described output control unit stops output according to this pick-off signal; Described centralized control unit is reselected the most satisfactory phase in described three-phase alternating-current supply.
5, device according to claim 4 is characterized in that, also comprises:
Alarm unit, being used for, three-phase all undesirable at described three-phase alternating-current supply input voltage value has under misphase or phase shortage, the excessive situation of output current, reports to the police.
6, device according to claim 1 is characterized in that, described input voltage detecting unit is made up of three tunnel identical testing circuits of corresponding described three-phase alternating-current supply respectively, wherein a road be:
First resistance and second resistance polyphone, the first resistance other end connects the output of described power subsystem, the other end of second resistance inserts described centralized control unit by the 3rd resistance, also by the 4th grounding through resistance, first diode is in parallel with the 4th resistance, the first diode anode ground connection, negative electrode connects the common port of the second, the 4th resistance.
7, device according to claim 2 is characterized in that, described phase angle detecting unit by corresponding described three-phase alternating-current supply respectively, three tunnel identical circuit form, wherein one the tunnel is:
The 5th resistance one end connects the direct current output plus terminal of described DC power source unit, the other end connects the base stage of first triode, the grounded emitter of first triode, collector electrode connects the input of described centralized control unit, the 6th resistance in parallel and first electric capacity between the base stage of first triode and the emitter.
8, a kind of AC power conversion method is characterized in that, comprising:
81), three-phase alternating-current supply transformation, the rectification with input is three road low-voltage dc power supplies;
82), described three road low-voltage dc power supplies are carried out the sampling of voltage detection signal;
83), according to this voltage detection signal, calculate the magnitude of voltage of described each phase of three-phase alternating-current supply, and select the most satisfactory one output mutually.
9, method according to claim 8 is characterized in that, with described step 82), 83) simultaneously, also carry out:
91), the rectifier output end by described three road low-voltage dc power supplies carries out the phase angle detection;
92), according to the phase angle testing result, judge the sequential relationship between the described three-phase alternating-current supply three-phase, and then judge in the three-phase and have or not misphase, phase shortage;
93), as if in the three-phase misphase, phase shortage are arranged, then warning.
10, method according to claim 8 is characterized in that, also comprises:
101), when output voltage is undesirable, stop output, and in described three-phase alternating-current supply, reselect the most satisfactory one mutually output.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2006101401527A CN101064480B (en) | 2006-04-28 | 2006-09-30 | AC power source converting apparatus and method |
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| CN200610078628.9 | 2006-04-28 | ||
| CN200610078628 | 2006-04-28 | ||
| CN2006101401527A CN101064480B (en) | 2006-04-28 | 2006-09-30 | AC power source converting apparatus and method |
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| CN101064480A true CN101064480A (en) | 2007-10-31 |
| CN101064480B CN101064480B (en) | 2011-11-16 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103293978A (en) * | 2013-05-30 | 2013-09-11 | 郑州郑大信息技术有限公司 | RTU (remote terminal unit) data collection terminal |
| CN103490643A (en) * | 2013-09-26 | 2014-01-01 | 广州普瑞电力控制系统设备有限公司 | Three-phase voltage controller with industrial power supply |
| CN106932663A (en) * | 2015-12-29 | 2017-07-07 | 中国石油天然气股份有限公司 | The measuring instrument of frequency conversion system |
| CN108767971A (en) * | 2018-05-29 | 2018-11-06 | 河南森源电气股份有限公司 | A kind of single-phase intelligent power supply management method and device |
| CN112946350A (en) * | 2021-03-02 | 2021-06-11 | 台山核电合营有限公司 | Single-phase voltage stability monitoring alarm circuit and device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1508934A (en) * | 2002-12-18 | 2004-06-30 | 孙苏虹 | Power supply method capable of preventing illegal use |
| CN2596659Y (en) * | 2002-12-26 | 2003-12-31 | 郭树 | Three phase power constant phase sequence protector |
| CN200976496Y (en) * | 2006-04-28 | 2007-11-14 | 海尔集团公司 | AC power switch apparatus |
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- 2006-09-30 CN CN2006101401527A patent/CN101064480B/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103293978A (en) * | 2013-05-30 | 2013-09-11 | 郑州郑大信息技术有限公司 | RTU (remote terminal unit) data collection terminal |
| CN103490643A (en) * | 2013-09-26 | 2014-01-01 | 广州普瑞电力控制系统设备有限公司 | Three-phase voltage controller with industrial power supply |
| CN106932663A (en) * | 2015-12-29 | 2017-07-07 | 中国石油天然气股份有限公司 | The measuring instrument of frequency conversion system |
| CN108767971A (en) * | 2018-05-29 | 2018-11-06 | 河南森源电气股份有限公司 | A kind of single-phase intelligent power supply management method and device |
| CN112946350A (en) * | 2021-03-02 | 2021-06-11 | 台山核电合营有限公司 | Single-phase voltage stability monitoring alarm circuit and device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101064480B (en) | 2011-11-16 |
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