CN204118687U - A kind of three phase mains random phase, open-phase protection circuit and Active Power Filter-APF - Google Patents
A kind of three phase mains random phase, open-phase protection circuit and Active Power Filter-APF Download PDFInfo
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- CN204118687U CN204118687U CN201420560213.5U CN201420560213U CN204118687U CN 204118687 U CN204118687 U CN 204118687U CN 201420560213 U CN201420560213 U CN 201420560213U CN 204118687 U CN204118687 U CN 204118687U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/20—Active power filtering [APF]
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Abstract
The utility model discloses a kind of three phase mains random phase, open-phase protection circuit and Active Power Filter-APF, wherein the random phase of three phase mains, open-phase protection circuit comprise importation, Phase sequence detection part, rectifying part, output; Active Power Filter-APF comprises instruction current computing circuit, current follow-up control circuit, drive circuit and main circuit, and above-mentioned a kind of power supply random phase, open-phase protection circuit.If power supply not phase shortage and phase sequence is correct, Active Power Filter-APF normally works; If power phase shortage or phase sequence mistake, Active Power Filter-APF because be subject to the random phase of power supply, open-phase protection circuit control and power-off does not work.
Description
Technical field
The utility model relates to a kind of power supply random phase, open-phase protection circuit, especially a kind of power supply random phase, open-phase protection circuit of Active Power Filter-APF.
Background technology
Active Power Filter-APF is a kind of novel electric power electric device for dynamic harmonic wave, compensating reactive power, its electrical block diagram as shown in Figure 1, quick tracing compensation can be carried out to the harmonic wave of different size and frequency, Active Power Filter-APF can pass through sampling load current and carry out each harmonic to be separated with idle, control and the size of active output current, frequency and phase place, and respond fast, offset phase induced current in load, achieve dynamic tracing compensation, and not only can mend harmonic wave but also mend idle and uneven.Active Power Filter-APF detects load current by current transformer, and calculated by inner DSP, extract the harmonic components in load current, then inner switching device IGBT is sent to by pwm signal, control inverter produces one and load harmonic current equal and opposite in direction, the contrary harmonic current injection in direction, in electrical network, reaches the object of filtering.
In the prior art, the internal circuit of Active Power Filter-APF does not have the function of the random phase of power supply and phase shortage, in Practical Project, the problem of disorderly phase and the phase shortage of power supply can't cause direct infringement to Active Power Filter-APF, but at load end, problems can not be ignored, first, if install the problem that electrician does not notice the random phase of power supply, the problem of power supply string phase is easily there is in wiring process, add in power up and do not access zero line, the electric product of all 220V all can burn because of the string phase of power supply, secondly, the problem of power phase shortage also can bring problem to load, such as threephase asynchronous machine, when phase shortage, its inner rotator electric current can increase, and then burn.
Utility model content
For the deficiency that prior art exists, the utility model provides a kind of three phase mains random phase, open-phase protection circuit on the one hand, for Active Power Filter-APF, comprising:
Importation: be coupled to the output of outside three-phase alternating voltage to receive elementary ac voltage signal, and export corresponding secondary alternating voltage signal;
Phase sequence detection part: be coupled to importation to receive secondary alternating voltage signal, and export corresponding Phase sequence detection signal;
Rectifying part: be coupled to Phase sequence detection part to receive Phase sequence detection signal, and export corresponding primary direct current pressure signal;
Output: be coupled to rectifying part to accept primary direct current pressure signal, and export the control signal of corresponding control Active Power Filter-APF main power source through and off;
Switch sections: be coupled to output with responsive control signal, is also coupled to opening or breaking with control load power supply between external power source and load.
The random phase of described three phase mains, open-phase protection circuit importation comprise:
Primary coil: be coupled to external communication voltage output end;
Secondary coil: be coupled in primary coil to receive elementary ac voltage signal, and export corresponding secondary alternating voltage signal.
The Phase sequence detection part of the random phase of described three phase mains, open-phase protection circuit comprises:
Bleeder circuit: be coupled to secondary coil to receive secondary alternating voltage signal, and export branch pressure voltage signal;
Phase-shift circuit: be coupled to bleeder circuit to receive branch pressure voltage signal, and export phase-shifting voltages signal.
The bleeder circuit of the random phase of described three phase mains, open-phase protection circuit comprises:
First bleeder circuit: the A phase output terminal being coupled to secondary coil, and export corresponding A phase branch pressure voltage signal;
Second bleeder circuit: the B phase output terminal being coupled to secondary coil, and export corresponding B phase branch pressure voltage signal;
3rd bleeder circuit: the C phase output terminal being coupled to secondary coil, and export corresponding C phase branch pressure voltage signal.
The phase-shift circuit of the random phase of described three phase mains, open-phase protection circuit comprises:
First phase-shift circuit: be coupled to the first bleeder circuit to receive A phase branch pressure voltage signal, and export corresponding A phase shift phase voltage signal;
Second phase-shift circuit: be coupled to the second bleeder circuit to receive B phase branch pressure voltage signal, and export corresponding B phase shift phase voltage signal;
3rd phase-shift circuit: be coupled to the 3rd bleeder circuit to receive C phase branch pressure voltage signal, and export corresponding C phase shift phase voltage signal.
The rectifying part of the random phase of described three phase mains, open-phase protection circuit comprises:
First brachium pontis: be coupled to the first phase-shift circuit to receive A phase shift phase voltage signal;
Second brachium pontis: be coupled to the second phase-shift circuit to receive B phase shift phase voltage signal;
3rd brachium pontis: be coupled to the 3rd phase-shift circuit to receive C phase shift phase voltage signal.
The output of the random phase of described three phase mains, open-phase protection circuit comprises:
RC filter circuit: be coupled to rectifying part to receive primary direct current pressure signal, and it is smooth-out that primary direct current is pressed;
Indicating circuit: be coupled to RC filter circuit to transmit primary direct current pressure signal, and indicated;
Voltage stabilizing circuit: be coupled to indicating circuit to receive primary direct current pressure signal, and export corresponding secondary direct voltage signal;
Control circuit: be coupled to voltage stabilizing circuit to receive secondary direct voltage signal, and export corresponding control signal, and then control opening or turning off of power supply.
The random phase of above-mentioned three phase mains, open-phase protection circuit can detect the phase sequence of three phase mains automatically, if the phase sequence of three phase mains and originally expect inconsistent or the phenomenon occurring phase shortage, will auto power off, and to reach the object protecting load.
The random phase of described power supply, open-phase protection circuit schematic diagram are as shown in Figure 3; the circuit theory diagrams of its importation (1) as shown in Figure 4; be made up of primary coil (10) and secondary coil (11); described primary coil (10) comprises L21, L22, L23 pin, and described secondary coil comprises A, B, C pin.Described primary coil (10) is coupled to the main circuit of Active Power Filter-APF, and as shown in Figure 2, described secondary coil (11) is coupled to the input of Phase sequence detection part (2).
The circuit theory diagrams of described Phase sequence detection part (2) as shown in Figure 5, by the first bleeder circuit (20), second bleeder circuit (21), 3rd bleeder circuit (22), first phase-shift circuit (23), second phase-shift circuit (24) and the 3rd phase-shift circuit (25) composition, the first described bleeder circuit is made up of the 4th resistance (R4) and the 7th resistance (R7), the 7th described resistance (R7) one end is coupled to the A pin of secondary coil (11), the other end is coupled to the 4th resistance (R4), the 4th described resistance (R4) one end is coupled to the 7th resistance (R7), the other end is coupled to the input of rectification circuit (3), the second described bleeder circuit is made up of the 5th resistance (R5) and the 8th resistance (R8), the 8th described resistance (R8) one end is coupled to the B pin of secondary coil (11), the other end is coupled to the 5th resistance (R5), the 5th described resistance (R5) one end is coupled to the 8th resistance (R8), and the other end is coupled to the input of rectification circuit (3), the 3rd described bleeder circuit is made up of the 6th resistance (R6) and the 9th resistance (R9), the 9th described resistance (R9) one end is coupled to the C pin of secondary coil (11), the other end is coupled to the 6th resistance (R6), the 6th described resistance (R6) one end is coupled to the 9th resistance (R9), and the other end is coupled to the input of rectification circuit (3), described the first phase-shift circuit (23) is made up of the first resistance (R1) and the first electric capacity (C1), and described first resistance (R1) is coupled to rectification circuit (3), and described the first electric capacity (C1) is coupled to rectification circuit (3), described the second phase-shift circuit (24) is made up of the second resistance (R2) and the second electric capacity (C2), and described second resistance (R2) is coupled to rectification circuit (3), and described the second electric capacity (C2) is coupled to rectification circuit (3), the 3rd described phase-shift circuit (25) is made up of the 3rd resistance (R3) and the 3rd electric capacity (C3), and described 3rd resistance (R3) is coupled to rectification circuit (3), and the 3rd described electric capacity (C3) is coupled to rectification circuit (3).
The circuit theory diagrams of described rectifying part (3) as shown in Figure 6, be made up of the first brachium pontis (30), the second brachium pontis (31) and the 3rd brachium pontis (32), described the first brachium pontis (30) is made up of the first rectifier diode (D1) and the second rectifier diode (D2)
Described the second brachium pontis (31) is made up of the 3rd rectifier diode (D3) and the 4th rectifier diode (D4), the 3rd described brachium pontis (32) is made up of the 5th rectifier diode (D5) and the 6th rectifier diode (D6), the anode of described the first rectifier diode (D1) is coupled between the negative electrode of the second rectifier diode (D2) and the 4th resistance (R4), the negative electrode of described the second diode (D2) is also coupled to the second electric capacity (C2), the anode of the 3rd described rectifier diode (D3) is coupled between the negative electrode of the 4th rectifier diode (D4) and the 5th resistance (R5), the negative electrode of the 4th described diode (D4) is also coupled to the 3rd electric capacity (C3), the anode of the 5th described rectifier diode (D5) is coupled between the negative electrode of the 6th rectifier diode (D6) and the 6th resistance (R6), the negative electrode of the 6th described diode (D6) is also coupled to the first electric capacity (C1), described the first rectifier diode (D1), the negative electrode of the 3rd rectifier diode (D3) and the 5th rectifier diode (D5) connects output (4) altogether, described the second rectifier diode (D2), the anode of the 4th rectifier diode (D4) and the 6th rectifier diode (D6) altogether.
The circuit theory diagrams of described output (4) as shown in Figure 7, be made up of RC filter circuit (40), indicating circuit (41), voltage stabilizing circuit (42) and control circuit (43), described RC filter circuit (40) is made up of the 4th electric capacity (C4) and the tenth resistance (R10), one end of the 4th described electric capacity (C4) is coupled to the output of rectifying part (3), other end ground connection, one end of the tenth described resistance (R10) is coupled to the 4th electric capacity (C4), other end ground connection.Described indicating circuit (41) is made up of light-emitting diode (D7) and the 11 resistance (R11), and the anode of described light-emitting diode (D7) is coupled to the tenth resistance (R10), and negative electrode is coupled to the 11 resistance (R11).Described voltage stabilizing circuit (42) is made up of the 12 resistance (R12), the 13 resistance (R13) and voltage stabilizing didoe (D8), one end of the 12 described resistance (R12) is coupled to the 11 resistance (R11), the other end is coupled to the 13 resistance (R13), the 13 described resistance (R13) is ground connection also, the negative electrode of described voltage stabilizing didoe (D8) is coupled between the 12 resistance (R12) and the 13 resistance (R13), its plus earth.Described control circuit (43) is made up of relay, described relay comprises the relay normally closed switch (K-0) that relay coil (K) is associated with three, described relay coil (K) one end is coupled to the negative electrode of voltage stabilizing didoe (D8), other end ground connection.Described three the relay normally closed switchs (K-0) be associated as shown in Figure 2, are coupled between external power source and load.
The utility model provides a kind of Active Power Filter-APF on the other hand, comprising:
Instruction current computing circuit: be coupled to loading nose to receive harmonic current, and produce corresponding computing signal;
Current follow-up control circuit: be coupled to instruction current computing circuit to receive computing signal, and produce corresponding control signal;
Drive circuit: be coupled to current follow-up control circuit with reception control signal, and produce corresponding drive singal;
Main circuit: be coupled to drive circuit to receive drive singal, and produce the voltage signal reverse with supply harmonic;
And a kind of three phase mains as above random phase, open-phase protection circuit: be coupled to main circuit, to receive main circuit voltage phase sequence and the conducting controlled between external power source and load or shutoff.
Above-mentioned Active Power Filter-APF can detect the phase sequence of feeder ear three phase mains automatically, if the phase sequence of three phase mains and originally expect inconsistent or the phenomenon occurring phase shortage, will auto power off, and to reach the object protecting Active Power Filter-APF.
Described instruction current computing circuit is coupled to loading nose; described current follow-up control circuit is coupled to instruction current computing circuit; described drive circuit is coupled to current follow-up control circuit; described main circuit is coupled to drive circuit; described main circuit is also coupled to external power source, and the random phase of described power supply, open-phase protection circuit are coupled between main circuit and external circuit.
Accompanying drawing explanation
Fig. 1 is the functional block diagram of conventional active electric-power filter;
Fig. 2 is the functional block diagram of Active Power Filter-APF after improving;
Fig. 3 is random phase of the present utility model, open-phase protection circuit schematic diagram;
Fig. 4 is the importation of Fig. 3;
Fig. 5 is the Phase sequence detection part of Fig. 3;
Fig. 6 is the rectifying part of Fig. 3;
Fig. 7 is the output of Fig. 3.
In figure: A0, three phase mains random phase, open-phase protection circuit; 1, importation; 10, primary coil; 11, secondary coil; 2, Phase sequence detection part; 20, the first bleeder circuit; 21, the second bleeder circuit; 22, the 3rd bleeder circuit; 23, the first phase-shift circuit; 24, the second phase-shift circuit; 25, the 3rd phase-shift circuit; 3, rectifying part; 30, the first brachium pontis; 31, the second brachium pontis; 32, the 3rd brachium pontis; 4, output; 40, RC filter circuit; 41, indicating circuit; 42, voltage stabilizing circuit; 43, control circuit; L21, the first primary coil pin; L22, the second primary coil pin; L23, the 3rd primary coil pin; A, first level coil pin; B, second subprime coil pin; C, for the third time level coil pin; R1, the first resistance; R2, the second resistance; R3, the 3rd resistance; R4, the 4th resistance; R5, the 5th resistance; R6, the 6th resistance; R7, the 7th resistance; R8, the 8th resistance; R9, the 9th resistance; R10, the tenth resistance; R11, the 11 resistance; R12, the 12 resistance; R13, the 13 resistance; C1, the first electric capacity; C2, the second electric capacity; C3, the 3rd electric capacity; C4, the 4th electric capacity; C5, the 5th electric capacity; D1, the first rectifier diode; D2, the second rectifier diode; D3, the 3rd rectifier diode; D4, the 4th rectifier diode; D5, the 5th rectifier diode; D6, the 6th rectifier diode; D7, light-emitting diode; D8, voltage stabilizing didoe; K, relay coil; K-0, relay normally closed switch group.
Embodiment
Circuit theory diagrams of the present utility model as shown in Figure 3, comprise importation (1), Phase sequence detection part (2), rectifying part (3) and output (4), as shown in Figure 2, be coupled in Active Power Filter-APF, whether disorderly can cut off external power source by phase or the phase shortage detecting external power source, its operation principle is as follows:
Three pins (L21, L22, L23) of the primary coil of importation (1) are coupled to the main circuit of active Three-phase electric-wave filter, the elementary alternating voltage that will be delivered to load receives comes, by the turn ratio of primary coil and secondary coil, produce the secondary alternating voltage that numerical value is less, be sent to Phase sequence detection part (2) by three pins (A, B, C) of secondary coil.
Expressing formula according to the phase voltage trigonometric function of three-phase alternating current knowledge three-phase alternating current is: uA=Umsin ω t, uB=Umsin (ω t-2 π/3), uC=Umsin (ω t+2 π/3), analyzes carrier phase shift 2 π/3 of the every phase of the known three-phase alternating-current supply of above-mentioned expression formula.For uA and uB phase, if uB phase angle is postponed π/3 obtain: uB=Umsin (ω t-2 π/3-π/3)=-Umsin ω t, be in rp state with uA=Umsin ω t, be in like manner in rp state by behind uC time delay π/3 with uB, uA is postponed π/3 afterwards and uC be in rp state.If the phase voltage after postponing mutually superposed by positive sequence uA-uB-uC-uA, under the state of three-phase equilibrium, its result is 0.But mutually superpose when backward, its result can not be then 0, such as superpose with the phase sequence phase shift of uA-uC-uB-uA, uC phase angle is postponed π/3 obtain: uC=Umsin (ω t+2 π/3-π/3)=Umsin (ω t+ π/3) advanced π/3, phase angle compared with uA=Umsin ω t, instead of rp state.The operation principle of Phase sequence detection part (2) is described above, comprises the first bleeder circuit (20), the second bleeder circuit (21), the 3rd bleeder circuit (22), the first phase-shift circuit (23), the second phase-shift circuit (24) and the 3rd phase-shift circuit (25).Described the first phase-shift circuit (23), second phase-shift circuit (24) and the 3rd phase-shift circuit (25) are RC phase-shift circuit, comprise an electric capacity and a resistance, by the integrating effect of electric capacity (during indirect current, capacitance voltage lagging current pi/2, different according to capacitance, the principle that its discharge and recharge time is also different, delayed π/3 of A phase voltage are made by the electric capacity selecting different capabilities, C phase voltage phase shift 2 π/3), respectively to from secondary coil pin (A, B, C) secondary alternating voltage received carries out phase shift, if the phase angle of B is postponed π/3 be in rp state with A, in like manner C time delay π/3 are rear and B is in rp state, A is postponed behind π/3 and C is in rp state.If the phase voltage after postponing mutually superposed by positive sequence A-B-C-A, under the state of three-phase equilibrium, its result is 0.Described the first bleeder circuit (20), the second bleeder circuit (21) and the 3rd bleeder circuit (22) all have two resistance to form, and assign to the principle of different voltage, play the effect of step-down, and limit the size of electric current according to different resistance.
Described rectifying part (3) is three-phase bridge rectifier circuit, be made up of three brachium pontis, the secondary alternating voltage that circuit of testing the phase sequence (2) produces is carried out rectification by it, by the principle of the single-phase conducting of the rectifier diode of three brachium pontis, obtain a primary direct current and press and transfer to output (4).
Described output (4) comprises RC filter circuit (40), indicating circuit (41), voltage stabilization part (42) and control section (43), if the main power source of Active Power Filter-APF does not have out of order or phase shortage, rectifying part (3) would not output voltage, does not therefore just have the action of output (4), if there is out of order or phase shortage in the main power source of Active Power Filter-APF, rectifying part (3) will output voltage, therefore the following action of output (4) is not just had: because the primary direct current pressure that rectifying part (4) exports is unstable and is full of pulsation, therefore the RC filter circuit (40) consisted of the tenth resistance (R10) the 4th electric capacity (C4) in parallel obtains the primary direct current pressure of a steady waveform, and indicated by the light-emitting diode (D7) in indicating circuit (41), primary direct current pressure is carried out regulating by (R12) and R(13) and is exported and the suitable voltage of relay by described voltage stabilizing circuit (42), this voltage is delivered to relay coil (K) again after voltage stabilizing didoe (D8) is stable, the conducting of relay (K) coil, control the relay normally closed switch group (K-0) be coupled between Active Power Filter-APF external power source and load to disconnect, main power source is cut off, the random phase of described power supply, open-phase protection circuit (A0) also power-off, circuit returns to initial condition.
The driving voltage of described relay is larger, is unlikely to because supply harmonic rectification is come in and drives the misoperation of relay.
Described Active Power Filter-APF comprises instruction current computing circuit, current follow-up control circuit, drive circuit and main circuit phase, open-phase protection circuit (A0) random in above-mentioned power supply, when Active Power Filter-APF is coupled in electric power system, if the three-phase alternating voltage that external voltage output exports not phase shortage and not random phase, the instruction current computing circuit of Active Power Filter-APF receives harmonic current at load end, and produces corresponding computing signal; The current follow-up control circuit of Active Power Filter-APF is coupled to instruction current computing circuit to receive computing signal, and produce corresponding control signal, the drive circuit of Active Power Filter-APF is coupled to current follow-up control circuit with reception control signal, and produce corresponding drive singal, the main circuit of Active Power Filter-APF is coupled to drive circuit to receive drive singal, and produce the voltage signal reverse with supply harmonic, the voltage signal produced and the harmonic wave of external power source offset, and therefore load end obtains fundamental voltage.
If the three-phase alternating voltage phase shortage that external voltage output exports or random phase, the random phase of described power supply, the importation (1) of open-phase protection circuit receives the elementary ac voltage signal of main circuit, and produce secondary alternating voltage signal, described phase detecting part (2) carries out phase shift to its voltage and superposes, and carry out rectification by rectifying part (3), export primary direct current pressure signal, described output (4) compresses into row filtering to primary direct current, dividing potential drop obtains secondary direct voltage, voltage stabilizing obtains the driving voltage of relay again, thus the work of the normal open switch group of control relay, cut off external power source, reach the object of protection load, with indicator light instruction in said process.
In sum, if phase shortage and phase sequence are incorrect for power supply, Active Power Filter-APF normally works; If power phase shortage or phase sequence mistake, Active Power Filter-APF because be subject to the random phase of power supply, open-phase protection circuit control and power-off does not work.
The above is only preferred implementation of the present utility model, protection range of the present utility model be not only confined to above-described embodiment, and all technical schemes belonged under the utility model thinking all belong to protection range of the present utility model.It should be pointed out that for those skilled in the art, do not departing from the some improvements and modifications under the utility model principle prerequisite, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (8)
1. three phase mains random phase, an open-phase protection circuit, for Active Power Filter-APF, is characterized in that: comprising:
Importation: be coupled to the output of outside three-phase alternating voltage to receive elementary ac voltage signal, and export corresponding secondary alternating voltage signal;
Phase sequence detection part: be coupled to importation to receive secondary alternating voltage signal, and export corresponding Phase sequence detection signal;
Rectifying part: be coupled to Phase sequence detection part to receive Phase sequence detection signal, and export corresponding primary direct current pressure signal;
Output: be coupled to rectifying part to accept primary direct current pressure signal, and export the control signal of corresponding control Active Power Filter-APF main power source through and off;
Switch sections: be coupled to output with responsive control signal, is also coupled to opening or breaking with control load power supply between external power source and load.
2. a kind of three phase mains according to claim 1 random phase, open-phase protection circuit, is characterized in that: described importation comprises:
Primary coil: be coupled to external communication voltage output end;
Secondary coil: be coupled in primary coil to receive elementary ac voltage signal, and export corresponding secondary alternating voltage signal.
3. a kind of three phase mains according to claim 1 random phase, open-phase protection circuit, is characterized in that: described Phase sequence detection part comprises:
Bleeder circuit: be coupled to secondary coil to receive secondary alternating voltage signal, and output point
Pressure voltage signal;
Phase-shift circuit: be coupled to bleeder circuit to receive branch pressure voltage signal, and export phase shift electricity
Pressure signal.
4. a kind of three phase mains according to claim 3 random phase, open-phase protection circuit, is characterized in that: described bleeder circuit comprises:
First bleeder circuit: the A phase output terminal being coupled to secondary coil, and export corresponding A phase branch pressure voltage signal;
Second bleeder circuit: the B phase output terminal being coupled to secondary coil, and export corresponding B phase branch pressure voltage signal;
3rd bleeder circuit: the C phase output terminal being coupled to secondary coil, and export corresponding C phase branch pressure voltage signal.
5. a kind of three phase mains according to claim 3 random phase, open-phase protection circuit, is characterized in that: described phase-shift circuit comprises:
First phase-shift circuit: be coupled to the first bleeder circuit to receive A phase branch pressure voltage signal, and export corresponding A phase shift phase voltage signal;
Second phase-shift circuit: be coupled to the second bleeder circuit to receive B phase branch pressure voltage signal, and export corresponding B phase shift phase voltage signal;
3rd phase-shift circuit: be coupled to the 3rd bleeder circuit to receive C phase branch pressure voltage signal, and export corresponding C phase shift phase voltage signal.
6. a kind of three phase mains according to claim 1 random phase, open-phase protection circuit, is characterized in that: described rectifying part comprises:
First brachium pontis: be coupled to the first phase-shift circuit to receive A phase shift phase voltage signal;
Second brachium pontis: be coupled to the second phase-shift circuit to receive B phase shift phase voltage signal;
3rd brachium pontis: be coupled to the 3rd phase-shift circuit to receive C phase shift phase voltage signal.
7. a kind of three phase mains according to claim 1 random phase, open-phase protection circuit, is characterized in that: described output comprises:
RC filter circuit: be coupled to rectifying part to receive primary direct current pressure signal, and it is smooth-out that primary direct current is pressed;
Indicating circuit: be coupled to RC filter circuit to transmit primary direct current pressure signal, and indicated;
Voltage stabilizing circuit: be coupled to indicating circuit to receive primary direct current pressure signal, and export corresponding secondary direct voltage signal;
Control circuit: be coupled to voltage stabilizing circuit to receive secondary direct voltage signal, and export corresponding control signal, and then control opening or turning off of power supply.
8. an Active Power Filter-APF, is characterized in that: comprising:
Instruction current computing circuit: be coupled to loading nose to receive harmonic current, and produce corresponding computing signal;
Current follow-up control circuit: be coupled to instruction current computing circuit to receive computing signal, and produce corresponding control signal;
Drive circuit: be coupled to current follow-up control circuit with reception control signal, and produce corresponding drive singal;
Main circuit: be coupled to drive circuit to receive drive singal, and produce the voltage signal reverse with supply harmonic;
A kind of three phase mains as described in claim 1 to 7 any one random phase, open-phase protection circuit: be coupled to main circuit, to receive main circuit voltage phase sequence and the conducting controlled between external power source and load or shutoff.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420560213.5U CN204118687U (en) | 2014-09-26 | 2014-09-26 | A kind of three phase mains random phase, open-phase protection circuit and Active Power Filter-APF |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420560213.5U CN204118687U (en) | 2014-09-26 | 2014-09-26 | A kind of three phase mains random phase, open-phase protection circuit and Active Power Filter-APF |
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| CN204118687U true CN204118687U (en) | 2015-01-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105743368A (en) * | 2016-04-12 | 2016-07-06 | 国网天津市电力公司 | Instruction current generation algorithm for load simulation of three-phase phased control rectifier bridge |
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2014
- 2014-09-26 CN CN201420560213.5U patent/CN204118687U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105743368A (en) * | 2016-04-12 | 2016-07-06 | 国网天津市电力公司 | Instruction current generation algorithm for load simulation of three-phase phased control rectifier bridge |
| CN105743368B (en) * | 2016-04-12 | 2019-02-22 | 国网天津市电力公司 | A kind of instruction current generating algorithm of three-phase phase control rectifier bridge load simulation |
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Address after: 325600 Yueqing Economic Development Zone, Zhejiang, China, No. 20, No. Patentee after: Zhejiang Baigu Electric Technology Co., Ltd. Address before: 325600 Yueqing Economic Development Zone, Wenzhou, No. 20 weft Road No. 271, Zhejiang Patentee before: BaiGu Electric Co., Ltd. |