CN103326381B - Low-power-consumption rapid capacitor switching switch with intelligent control - Google Patents
Low-power-consumption rapid capacitor switching switch with intelligent control Download PDFInfo
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- CN103326381B CN103326381B CN201310307015.8A CN201310307015A CN103326381B CN 103326381 B CN103326381 B CN 103326381B CN 201310307015 A CN201310307015 A CN 201310307015A CN 103326381 B CN103326381 B CN 103326381B
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Abstract
The invention discloses a capacitor switching switch. The switch comprises a three-phase source input end, a three-phase control output end, first and second electronic switches, first and second current transformers, first and second switch two-end zero-crossing signal detecting circuits, first and second zero-crossing trigger modules; first and second current detecting circuits and a control unit, wherein the first current transformer and the first electronic switch are sequentially connected in series between a first input end and a first output end; the first input end is connected with the A phase of three-phase source input; the first output end is connected with the first end of a three-phase power capacitor; the first current transformer is connected with the first current detecting circuit; the first switch two-end zero-crossing signal detecting circuit is located at two ends of the first electronic switch; the first zero-crossing trigger module is directly connected with the first electronic switch; the control unit is connected with the first current detecting circuit, the first switch two-end zero-crossing signal detecting circuit and the first zero-crossing trigger module respectively; a C circuit is same as an A circuit.
Description
Technical field
The present invention relates to a kind of low-power consumption Quick-action type capacitor fling-cut switch with Based Intelligent Control, particularly a kind ofly conveniently can be applied in the various voltage zero-cross and can the fling-cut switch of the frequent low-power consumption of quick-switching occasion of needing.
Background technology
In current electric reactive compensating system, widely use controllable silicon, synchro switch, this several operating passing zero Switch Controller power capacitor of combination switch carries out voltage zero-cross switching, in order to make electric capacity impulse current little, must ensure that switch accurately can be connected at voltage over zero, this just require the detection accuracy of the voltage zero-crossing detection circuit of major loop switch ends and antijamming capability strong, and at present conventional be that bi-directional light electric coupling input is connected with current-limiting resistance, its output output voltage zero cross signal wider width, switch connection moment and actual zero-acrross ing moment is caused to have larger gap, and along with the development of modern industry, frequency conversion, widely using of rectifying installation, harmonic pollution has become the subject matter of the harm quality of power supply, and adopt zero cross detection circuit conventional at present can accurately not detect zero crossing in the occasion that harmonic pollution is serious, repeatedly level chattering can be there is near point of zero voltage, thus cause program chaotic, cause controllable silicon false triggering can produce larger impact surge current, extremely adverse influence is brought to useful life of load and switch itself and reliability.
The circuits for triggering that current controllable silicon is conventional extensively adopt metal-oxide-semiconductor or triode pulse transformer, control circuit sends continuous print driving pulse in the voltage zero-cross moment, driven MOS pipe, triode and pulse transformer are always in running order, system power dissipation is larger, driving element and pulse transformer seriously generate heat, and decrease the useful life of product.
Existing metallurgy, welding machine, to vibrate these trade power consumption load variations fast, the operational mode that steepness is large, and load variations frequency can reach about 20ms faster sometimes, cannot carry out effective reactive power compensation, to operation of power networks and user extremely unfavorable.
Summary of the invention
Goal of the invention: technical problem to be solved by this invention is for the deficiencies in the prior art, provides a kind of low-power consumption Quick-action type capacitor fling-cut switch with Based Intelligent Control.
In order to solve the problems of the technologies described above, the invention discloses a kind of low-power consumption Quick-action type capacitor fling-cut switch with Based Intelligent Control, comprise three-phase power input end (A1, B1, C1), three-phase control output end (A2, B2, C2), first electronic switch (2) and the second electronic switch (2 ＇), first current transformer (1) and the second current transformer (1 ＇), first switch ends zero passage signal detection circuit (5) and second switch two ends zero passage signal detection circuit (5 ＇), first zero cross fired module (4) and the second zero cross fired module (4 ＇), first current detection circuit (3) and the second current detection circuit (3 ＇), and control unit (8),
The first current transformer (1) and the first electronic switch (2) is connected in series successively between first input end (A1) and the first output (A2), first input end (A1) is for connecting the A phase power supply of three phase mains input, and the first output (A2) is for connecting the first end of three-phase power capacitor; First current transformer (1) connects the first current detection circuit (3), first switch ends zero passage signal detection circuit (5) is positioned at the first electronic switch (2) two ends, first zero cross fired module (4) is directly connected with the first electronic switch (2), and described control unit (8) connects the first current detection circuit (3), the first switch ends zero passage signal detection circuit (5) and the first zero cross fired module (4) respectively;
Second input (B1) is for connecting the B phase power supply of three phase mains input, and the second output (B2) is for connecting the second end of three-phase power capacitor;
The second current transformer (1 ＇) and the second electronic switch (2 ＇) is connected in series successively between 3rd input (C1) and the 3rd output (C2), 3rd input (C1) is for connecting the C phase power supply of three phase mains input, and the 3rd output (C2) is for being connected to the 3rd end of three-phase power capacitor; Second current transformer (1 ＇) connects the second current detection circuit (3 ＇), second switch two ends zero passage signal detection circuit (5 ＇) is positioned at the second electronic switch (2 ＇) two ends, second zero cross fired module (4 ＇) is directly connected with the second electronic switch (2 ＇), and described control unit (8) connects the second current detection circuit (3 ＇), second switch two ends zero passage signal detection circuit (5 ＇) and the second zero cross fired module (4 ＇) respectively.
First current detection circuit described in the present invention (3) input connects the first current transformer (1), output is connected to control unit (8), described second current detection circuit (3 ＇) input connects the second current transformer (1 ＇), and output is connected to control unit (8).
Described in the present invention, the input of the first switch ends zero passage signal detection circuit (5) connects two tip nodes of the first electronic switch (2), and output is connected to the first zero cross fired module (4) and control unit (8); The input at described second switch two ends zero passage signal detection circuit (5 ＇) connects two tip nodes of the second electronic switch (2 ＇), and output is connected to the second zero cross fired module (4 ＇) and control unit (8).
Control unit described in the present invention (8) comprises CPU processor.
Described in the present invention, the first switch ends zero passage signal detection circuit (5) comprises current-limiting resistance R13, current-limiting resistance R13 one end connects electric capacity C3, the negative electrode of diode D2 and the anode of diode D1, the base stage of the negative electrode connecting triode Q2 of diode D1, the collector electrode of triode Q2 is connected to power supply VCC3 by resistance R1 and electric capacity C1, the emitter of triode Q2 draws by the anode of optocoupler U2 connection diode D2 and the anode tap of electric capacity C3, diode D2 the front end that K1 signal end is connected to the first electronic switch (2); The output emitter of optocoupler U2 connects pull down resistor R9, connected the 5 pin inputs of comparator U4B by the differential circuit of electric capacity C4, diode D5 and resistance R10 composition simultaneously, the bleeder circuit that+5V power supply consists of resistance R6 and resistance R12 produces the 6 pin inputs that a benchmark level is connected to comparator U4B, and electric capacity C5 is connected in parallel on resistance R6 two ends for filtering High-frequency Interference; The 7 pin outputs of comparator U4B connect a pull-up resistor R2 and filter capacitor C2, and export zero cross signal P_Zero to the first zero cross fired module (4) and the input input c of control unit (8) and an I/O mouth of CPU processor.
The current-limiting resistance R13 other end connects electric capacity C11, the negative electrode of diode D8 and the anode of diode D7, and the anode tap of diode D8 draws the rear end that K2 signal end is connected to the first electronic switch (2); The base stage of the negative electrode connecting triode Q5 of diode D7, the collector electrode of triode Q5 is connected to power supply VCC4 by resistance R14 and electric capacity C9, and the emitter of triode Q5 connects anode and the electric capacity C11 of diode D8 by optocoupler U6; Optocoupler U6 exports emitter and connects pull down resistor R22, simultaneously by electric capacity C12, the differential circuit that diode D11 and resistance R23 forms connects the 3 pin inputs of comparator U4A, the bleeder circuit that+5V power supply consists of resistance R19 and resistance R25 produces the 2 pin inputs that a benchmark level is connected to comparator U4A, and electric capacity C13 is connected in parallel on resistance R19 two ends for filtering High-frequency Interference; The 1 pin output of comparator U4A connects a pull-up resistor R15 and filter capacitor C10, and exports zero cross signal N_Zero to the first zero cross fired module (4).
Described in the present invention, the first zero cross fired module (4) comprises d type flip flop U3B and d type flip flop U3A, the input D of d type flip flop U3B holds 12 pin to be connected to CPU processor and receives switching control signal Cmd, the input CLK of d type flip flop U3B holds 11 pin to connect the first switch ends zero passage signal detection circuit (5) and receives zero cross signal P_Zero, the input CLR that reversed-phase output 8 pin of d type flip flop U3B connects d type flip flop U3B by resistance R11 holds 13 pin, the input CLR of d type flip flop U3B holds 13 pin to connect electric capacity C7 and electric capacity C8 to power supply ground, positive output end 9 pin of d type flip flop U3B is connected to power supply ground by optocoupler U1 and current-limiting resistance R8, optocoupler U1 exports collector electrode and connects power supply VCC4, the output emitter of optocoupler U1 is connected to the base stage of triode Q1 by resistance R3, the base stage of the emitter connecting triode Q3 of triode Q1, the emitter of triode Q3 exports the G1 pole of thyristor VT1 in triggering signal AG1 to the first electronic switch (2) by resistance R5 and diode D3, the emitter of triode Q3 is simultaneously by resistance R5, the connection of electric capacity C6 and diode D4 exports the G1 pole of thyristor VT1 in triggering signal AG1 to the first electronic switch (2), the emitter of triode Q1 and the base stage of triode Q3 are connected by resistance R4 and output signal the K1 pole of thyristor VT1 in AK1 to the first electronic switch (2), output signal AK1 end simultaneously and are connected to triggering signal AG1 end by diode D4,
The input D of d type flip flop U3A holds 2 pin to receive the switching control signal Cmd of CPU processor, d type flip flop U3A inputs CLK and holds 3 pin to connect the first switch ends zero passage signal detection circuit (5) reception zero cross signal N_Zero, the input CLR that reversed-phase output 6 pin of d type flip flop U3A connects d type flip flop U3A by resistance R24 holds 1 pin, the input CLR of d type flip flop U3A holds 1 pin to connect electric capacity C15 and electric capacity C16 to power supply ground, positive output end 5 pin of d type flip flop U3A is connected to power supply ground by optocoupler U5 and current-limiting resistance R21, optocoupler U5 exports collector electrode and connects VCC3, export emitter is connected to triode Q4 base stage by resistance R16, the base stage of the emitter connecting triode Q6 of triode Q4, the emitter of triode Q6 is by resistance R18, diode D9 exports the G2 pole of thyristor VT2 in triggering signal AG2 to the first electronic switch (2), the emitter of triode Q4 and the base stage of triode Q6 are connected by resistance R18 and output signal the K2 pole of thyristor VT2 in AK2 to the first electronic switch (2), output signal AK2 end simultaneously and are connected to triggering signal AG2 end by diode D10.
The two ends of second switch described in the present invention zero passage signal detection circuit (5 ＇) comprise current-limiting resistance R26, current-limiting resistance R26 one end connects electric capacity C17, the negative electrode of diode D6 and the anode of diode D12, the base stage of the negative electrode connecting triode Q7 of diode D12, the collector electrode of triode Q7 is connected to power supply VCC1 by resistance R27 and electric capacity C18, triode Q7 emitter draws by the anode tap of anode and electric capacity C17, diode D6 that optocoupler U7 connects diode D6 the front end that K3 signal end is connected to the second electronic switch (2 ＇), the output emitter of optocoupler U7 connects pull down resistor R28, simultaneously by electric capacity C19, the differential circuit that diode D13 and resistance R29 forms connects the 3 pin inputs of comparator U8A, the bleeder circuit that+5V power supply consists of resistance R30 and resistance R31 produces the 2 pin inputs that a benchmark level is connected to comparator U8A, electric capacity C20 is connected in parallel on resistance R30 two ends, for filtering High-frequency Interference, the 1 pin output of comparator U8A connects a pull-up resistor R32 and filter capacitor C21, export the zero cross signal P_Zero_1 input input d to the second zero cross fired module (4 ＇) and control unit (8), an i.e. I/O mouth of CPU processor.
The current-limiting resistance R26 other end connects electric capacity C25, the negative electrode of diode D16 and the anode of diode D17, and the anode tap of diode D16 draws the rear end that K4 signal end is connected to the second electronic switch (2 ＇), the base stage of the negative electrode connecting triode Q10 of diode D17, the collector electrode of triode Q10 is connected to power supply VCC2 by resistance R39 and electric capacity C26, the emitter of triode Q10 connects anode and the electric capacity C25 of diode D16 by optocoupler U11, optocoupler U11 exports emitter and connects pull down resistor R40, simultaneously by electric capacity C27, the differential circuit that diode D18 and resistance R41 forms connects the 5 pin inputs of comparator U8B, the bleeder circuit that+5V power supply consists of resistance R42 and resistance R43 produces the 6 pin inputs that a benchmark level is connected to comparator U8B, electric capacity C28 is connected in parallel on resistance R42 two ends for filtering High-frequency Interference, the 7 pin outputs of comparator U8B connect a pull-up resistor R44 and filter capacitor C29, and export zero cross signal N_Zero_1 to the second zero cross fired module (4 ＇).
Second zero cross fired module described in the present invention (4 ＇) comprises d type flip flop U9A and d type flip flop U9B, the input D of d type flip flop U9A holds 2 pin to be connected to CPU and receives switching control signal Cmd1, the input CLK of d type flip flop U9A holds 3 pin to connect second switch two ends zero passage signal detection circuit (5 ＇) and receives zero cross signal P_Zero_1, the input CLR that reversed-phase output 6 pin of d type flip flop U9A connects d type flip flop U9A by resistance R33 holds 1 pin, the input CLR of d type flip flop U9A holds 1 pin to connect electric capacity C22 and electric capacity C23 to power supply ground, positive output end 5 pin of d type flip flop U9A is connected to power supply ground by optocoupler U10 and current-limiting resistance R34, optocoupler U10 exports collector electrode and connects power supply VCC2, export emitter is connected to triode Q8 base stage by resistance R35, the base stage of the emitter connecting triode Q9 of triode Q8, the emitter of triode Q9 exports the G3 pole of thyristor VT3 in triggering signal CG1 to the second electronic switch (2 ＇) by resistance R38 and diode D14, the emitter of triode Q9 is simultaneously by resistance R38, electric capacity C24 and diode D15 exports the G3 pole of thyristor VT3 in triggering signal CG1 to the second electronic switch (2 ＇), the emitter of triode Q8 and the base stage of triode Q9 are connected by resistance R37 and output signal the K3 pole of thyristor VT3 in CK1 to the second electronic switch (2 ＇), output signal CK1 end simultaneously and are connected to triggering signal CG1 end by diode D15,
The input D of d type flip flop U9B holds 12 pin to be connected to CPU and receives switching control signal Cmd1, the input CLK of d type flip flop U9B holds 11 pin connection second switch two ends zero passage signal detection circuit (5 ＇) to receive zero cross signal N_Zero_1 and holds, the input CLR that reversed-phase output 8 pin of d type flip flop U9B connects d type flip flop U9B by resistance R45 holds 13 pin, the input CLR of d type flip flop U9B holds 13 pin to connect electric capacity C30 and electric capacity C31 to power supply ground, and positive output end 9 pin of d type flip flop U9B is connected to power supply ground by optocoupler U12 and current-limiting resistance R46; Optocoupler U12 exports collector electrode and connects VCC1, export emitter is connected to triode Q11 base stage by resistance R47, the base stage of the emitter connecting triode Q12 of triode Q11, the emitter of triode Q12 exports the G4 pole of thyristor VT4 in triggering signal CG2 to the second electronic switch (2 ＇) by resistance R50, diode D19; The emitter of triode Q11 and the base stage of triode Q12 are connected by resistance R49 and output signal the K4 pole of thyristor VT4 in CK2 to the second electronic switch (2 ＇), and synchronous signal CK2 holds and is connected to triggering signal CG2 end by diode D20.
Core of the present invention is the design of zero cross fired module and switch ends zero passage signal detection circuit, and three-phase power input end (A1, B1, C1), three-phase control output end (A2, B2, C2), the first electronic switch (2) and the second electronic switch (2 ＇), first current transformer (1) and the second current transformer (1 ＇), the first current detection circuit (3) and the second current detection circuit (3 ＇), and control unit (8) can adopt existing structure.This also reflects adaptability widely and the versatility of zero cross fired module and switch ends zero passage signal detection circuit in the present invention, is convenient to the transformation and optimization of carrying out low cost.
The present invention adopts two electronic switches to control two control three control modes of three phase mains, intelligent control unit with CPU processor carries out intelligent optimal control, in order to the residual voltage realized on the frequent input of switching and switch fast and the process breaker in middle two ends of excision and capacitor is minimum, the three phase mains of control unit to access carries out Phase sequence detection, correctly carries out control and state instruction according to the phase sequence of the actual access power supply detected, existing metallurgy, welding machine, vibrate these trade power consumption load variations fast, the operational mode that steepness is large, load variations frequency can reach about 20ms faster sometimes, can not compensate fast and effectively, frequency conversion simultaneously, a large amount of uses of rectifying installation, Harmfulness Caused by Harmonics is more and more serious, to operation of power networks and user extremely unfavorable, in order to ensure that the switching frequency of electric capacity can meet 20ms, zero cross detection circuit does not adopt conventional current-limiting resistance and optocoupler testing circuit, and adopt by current-limiting resistance, diode, triode, the high sensitivity that optocoupler and comparator IC form, the testing circuit that anti-harmonic wave ability is strong, in conjunction with using CPU processor in control unit as logical operation, signal designation and intelligent optimal control are core, make full use of the flexible Volume control of CPU processor, employing first triggers C phase electronic switch when dropping into and triggers A phase electronic switch again, the anti-phase triggering technique that A phase electronic switch excises C phase electronic switch is more first excised during excision, realize the quick operating passing zero of fling-cut switch, avoid the impact of electronic switch in trigger process and fluctuation simultaneously, and need not capacitor residual voltage be considered, only need electric capacity two ends equipotential, substantially increase the interval of electric capacity switching again, realize the continuous switching of 20ms completely, the occasion of frequent quick-switching can be applicable to.
Beneficial effect: noiseless when capacitor fling-cut switch of the present invention is a kind of use, anti-interference strong, fast response time, can the low-power consumption Quick-action type capacitor fling-cut switch with Based Intelligent Control of automatic decision and indication fault.
The present invention is with CPU processor for control core, and the zero cross detection circuit strong in conjunction with high sensitivity, anti-harmonic wave ability controls electronic switch, has that voltage zero-cross drops into accurately, little, anti-interference strong feature of shoving, and extends electric life; Adopt and only send trigger impulse conducting silicon controlled rectifier switch element in the switch ends voltage zero-cross moment, continuous impulse is not used to trigger, and compole short (about 100us) during the zero cross signal of zero cross detection circuit output, whole like this circuitry consumes power is very little, and the power consumption of product reduces greatly; By control unit Intelligent Measurement, various fault message and operating state can be judged in time, easy to maintenance.
Accompanying drawing explanation
To do the present invention below in conjunction with the drawings and specific embodiments and further illustrate, above-mentioned and/or otherwise advantage of the present invention will become apparent.
Fig. 1 is the electrical connection diagram of the low-power consumption Quick-action type capacitor fling-cut switch with Based Intelligent Control of the present invention.
Fig. 2 is the schematic diagram of switch ends zero passage signal detection circuit 5 of the present invention.
Fig. 3 is the schematic diagram of zero cross fired module 4 of the present invention.
Fig. 4 is the schematic diagram of switch ends zero passage signal detection circuit 5 ＇ of the present invention.
Fig. 5 is the schematic diagram of zero cross fired module 4 ＇ of the present invention.
Fig. 6 is the inner schematic diagram of electronic switch 2 of the present invention.
Fig. 7 is the inner schematic diagram of electronic switch 2 ＇ of the present invention.
Fig. 8 is the oscillogram of interval of the present invention 20ms fast-switching switch.
Embodiment
A kind of low-power consumption Quick-action type capacitor fling-cut switch with Based Intelligent Control of the present invention, comprises power supply input A1, B1, C1, controls to export A2, B2, C2, electronic switch 2,2 ＇, current transformer 1,1 ＇, switch ends zero passage signal detection circuit 5,5 ＇, zero cross fired module 4,4 ＇, current detection circuit 3,3 ＇, and control unit 8.Wherein external control signal 7 can control by Input Control Element 8 as required.Operating state instruction 6 is connected with control unit 8 and shows current operating state.
The input a of described electronic switch 2 accesses by current transformer 1 the A phase power supply that power supply input A1 is connected to three phase mains input, electronic switch 2 output c is by controlling to export the first end that A2 is connected to three-phase power capacitor, power supply input B1 directly connects the B phase of three phase mains input, control to export the second end that B2 is connected to three-phase power capacitor, the input a of electronic switch 2 ＇ accesses by current transformer 1 ＇ the C phase power supply that power supply input C1 is connected to three phase mains input, electronic switch 2 ＇ output c is by controlling to export the 3rd end that C2 is connected to three-phase power capacitor.
Described current detection circuit 3 input a connects current transformer 1, and output b is connected to the input e of control unit 8.Described current detection circuit 3 ＇ input a connects current transformer 1 ＇, and output b is connected to the input f of control unit 8.Input a with b of described switch ends zero passage signal detection circuit 5 is connected input a and the output c of electronic switch 2 respectively, and the output c of switch ends zero passage signal detection circuit 5 is connected to the input b of zero cross fired the module 4 and input c of control unit 8.
Input a with b of described switch ends zero passage signal detection circuit 5 ＇ is connected input a and the output c of electronic switch 2 ＇ respectively, and the output c of switch ends zero passage signal detection circuit 5 ＇ is connected to the input b of zero cross fired module 4 ＇ and the input d of control unit 8.
The control end a of the input a connection control unit 8 of described zero cross fired module 4, input b is connected respectively to the input c of the control unit 8 and output c of switch ends zero passage signal detection circuit 5, and the output c of zero cross fired module 4 is connected to the trigger input b of electronic switch 2.
The control end b of the input a connection control unit 8 of described zero cross fired module 4 ＇, input b is connected respectively to the input d of control unit 8 and the output c of switch ends zero passage signal detection circuit 5 ＇, the output c of zero cross fired module 4 ＇ are connected to the trigger input b of electronic switch 2 ＇.
Described operating state instruction 6 is connected to the output g of control unit 8.Described external control signal 7 is connected to the input h of control unit 8.Described control unit 8 comprises CPU processor, watchdog reset circuit and power supply auxiliary circuit;
Described switch ends zero passage signal detection circuit 5 or 5 ＇ is made up of current-limiting resistance, diode, triode, optocoupler and comparator IC, input K1 and K2 is connected to input a and the output c of electronic switch 2, input K3 and K4 is connected to input a and the output c of electronic switch 2 ＇, the zero cross signal that optocoupler exports connects comparator input anode after differential circuit process, the negative terminal of comparator connects the benchmark level of an electric resistance partial pressure, and the zero cross signal of comparator output terminal is connected to the input end of clock of d type flip flop in zero cross fired module.
Described zero cross fired module 4 or 4 ＇ is by d type flip flop, isolation optocoupler, drive triode, diode forms, the input D of d type flip flop holds control end a or b of connection control unit 8, the zero cross signal of input clock end connecting valve two ends the zero cross detection circuit 5 or 5 ＇ output c of d type flip flop, the output Q of d type flip flop is connected to driving isolation optocoupler, and the output of optocoupler is connected to and drives triode to produce trigger impulse.
Described control unit 8 can identify the phase sequence of supply voltage, and when power phase mistake, working state indicating circuit 6 shows the locking of phase sequence mistake.
Described control unit 8 can sensing capacitor electric current, and when condenser current is greater than overcurrent set point, control unit excises power capacitor work immediately, and working state indicating circuit 6 indicates overcurrent locking simultaneously.
Described control unit 8 can be monitored the zero cross signal that switch ends zero cross detection circuit exports, and can judge the working condition of switch in time, and working state indicating circuit 6 indicates corresponding operating state simultaneously.
When the input operation controlling three-phase power capacitor, the control end b of control unit 8 first sends C phase loop and drops into the input a of signal to zero passage trigger module 4 ＇, drop into signal in B phase and C phases line voltage be zero moment produce by d type flip flop circuit trigger impulse to be connected to electronic switch 2 ＇ trigger input b by the output c of zero cross fired module 4 ＇, triggering and conducting electronic switch 2 ＇, then the control end a of control unit 8 sends A phase loop again and drops into the input a of signal to zero passage trigger module 4, drop into signal in A phase phase voltage be zero moment produce by d type flip flop circuit trigger impulse to be connected to electronic switch 2 trigger input b by the output c of zero cross fired module 4, triggering and conducting electronic switch 2.
When the excision operation controlling three-phase power capacitor, the control end a of control unit 8 first sends A phase loop excision signal, electronic switch 2 is automatically disconnected in zero moment at current transformer 1 electric current, then the control end b of control unit 8 sends C phase loop excision signal, and electronic switch 2 ＇ is automatically disconnected in zero moment at current transformer 1 ＇ electric current.
The low-power consumption Quick-action type capacitor fling-cut switch employing photoelectrical coupler of the present invention with Based Intelligent Control and the accurate zero passage signal detection circuit of high accuracy of integrated circuit composition, have highly sensitive, the advantage that consistency is good and strong with antijamming capability, control unit according to external control signal only at switch ends voltage zero-cross time trigger controllable silicon, reduce the heating of driving element, reduce Overall Power Consumption, simultaneously because switch is connected at zero-acrross ing moment, decrease load transients heavy current impact, extend the useful life of capacitor, be suitable for doing in the application scenario of frequent switching electric capacity using.
Embodiment 1
Below in conjunction with Fig. 1, present embodiment is described, with the low-power consumption Quick-action type capacitor fling-cut switch of Based Intelligent Control described in present embodiment, it comprises three phase mains input A1, B1, C1, three phase controls export A2, B2, C2, electronic switch 2,2 ＇, current transformer 1,1 ＇, switch ends zero passage signal detection circuit 5,5 ＇, zero cross fired module 4,4 ＇, current detection circuit 3,3 ＇, operating state instruction 6, external control signal 7, control unit 8.
The input a of described electronic switch 2 accesses by current transformer 1 the A phase power supply that power supply input A1 is connected to three phase mains input, electronic switch 2 output c is by controlling to export the first end that A2 is connected to three-phase power capacitor, power supply input B1 directly connects the B phase of three phase mains input, control to export the second end that B2 is connected to three-phase power capacitor, the input a of electronic switch 2 ＇ accesses by current transformer 1 ＇ the C phase power supply that power supply input C1 is connected to three phase mains input, electronic switch 2 ＇ output c is by controlling to export the 3rd end that C2 is connected to three-phase power capacitor.
Described current detection circuit 3 input a connects current transformer 1, and output b is connected to the input e of control unit 8.
Described current detection circuit 3 ＇ input a connects current transformer 1 ＇, and output b is connected to the input f of control unit 8.
Input a with b of described switch ends zero passage signal detection circuit 5 is connected input a and the output c of electronic switch 2 respectively, and the output c of switch ends zero passage signal detection circuit 5 is connected to the input b of zero cross fired the module 4 and input c of control unit 8.
Input a with b of described switch ends zero passage signal detection circuit 5 ＇ is connected input a and the output c of electronic switch 2 ＇ respectively, and the output c of switch ends zero passage signal detection circuit 5 ＇ is connected to the input b of zero cross fired module 4 ＇ and the input d of control unit 8.
The control end a of the input a connection control unit 8 of described zero cross fired module 4, input b is connected respectively to the input c of the control unit 8 and output c of switch ends zero passage signal detection circuit 5, and the output c of zero cross fired module 4 is connected to the trigger input b of electronic switch 2.
The control end b of the input a connection control unit 8 of described zero cross fired module 4 ＇, input b is connected respectively to the input d of control unit 8 and the output c of switch ends zero passage signal detection circuit 5 ＇, the output c of zero cross fired module 4 ＇ are connected to the trigger input b of electronic switch 2 ＇.
Described operating state instruction 6 is connected to the output g of control unit 8.
Described external control signal 7 is connected to the input h of control unit 8.
Described control unit 8 comprises CPU processor, watchdog reset circuit and power supply auxiliary circuit; Wherein house dog and reset circuit and power supply auxiliary circuit are conventional circuit design, CPU processor select ST company of STMicw Electronics to produce the chip of model STM32F103RB.
As shown in Figure 6 and Figure 7, in the present embodiment, described electronic switch 2 is that employing two antiparallel thyristor VT1 and thyristor VT2 forms.Described electronic switch 2 ＇ is that employing two antiparallel thyristor VT3 and thyristor VT4 forms.
Fig. 1 is the internal electric connection layout of the low-power consumption Quick-action type capacitor fling-cut switch with Based Intelligent Control, two electronic switches are adopted to control two control three control modes of three-phase power capacitor, during system electrification, first CPU processor carries out electrification reset, system initialization works, then whether CPU processor is correct according to the zero cross signal detection power phase of switch ends zero cross detection circuit, the zero cross signal of next step sense switch two ends zero cross detection circuit, when external control signal effectively simultaneously C phase, A phase all zero passage normal operation is then described; When the invalid C phase of external signal, A phase still can detect zero passage or the zero-crossing pulse cycle is greater than 10ms, then prove circuit break down, locking control function, when zero cross signal and power phase all normally laggard enter main program, over voltage is detected in real time, phase shortage and switch running status in main program.When CPU processor receive outside drop into signal time, first according to ordering in launching, first trigger C phase electronic switch and trigger A phase electronic switch again, simultaneously sense switch state real-time update display; When CPU processor receives external mute signal, according to excision order, first excise A phase electronic switch and excise C phase electronic switch again.CPU processor is adopted to control electronic switch flexible, powerful, realize the quick operating passing zero of fling-cut switch, avoid the impact of electronic switch in trigger process and fluctuation simultaneously, and need not capacitor residual voltage be considered, only need electric capacity two ends equipotential, substantially increase the interval of electric capacity switching again, realize the continuous switching of 20ms completely, the occasion of frequent quick-switching can be applicable to.CPU processor drops into or excision controls, and only need to export corresponding high level or low level, zero cross fired module produces trigger impulse automatically according to control level and zero cross signal.
Switch ends zero cross detection circuit 5. in embodiment 1 is described below in conjunction with Fig. 2
Described switch ends zero passage signal detection circuit 5 comprises current-limiting resistance R13, current-limiting resistance R13 one end connects electric capacity C3, the negative electrode of diode D2 and the anode of diode D1, the base stage of the negative electrode connecting triode Q2 of diode D1, the collector electrode of triode Q2 is connected to power supply VCC3 by resistance R1 and electric capacity C1, the emitter of triode Q2 connects the anode of diode D2 and the anode tap extraction K1 signal end of electric capacity C3, diode D2 by optocoupler U2.Optocoupler U2 exports emitter and connects pull down resistor R9, optocoupler U2 exports emitter by electric capacity C4, the differential circuit that diode D5 and resistance R10 form is connected the 5 pin inputs of comparator U4B, the bleeder circuit that+5V power supply consists of resistance R6 and resistance R12 produces the 6 pin inputs that a benchmark level is connected to comparator U4B, electric capacity C5 is in parallel with resistance R6 is used for filtering High-frequency Interference, the 7 pin outputs of comparator U4B connect a pull-up resistor R2 and filter capacitor C2, export zero cross signal P_Zero to zero passage trigger module 4; The current-limiting resistance R13 other end connects electric capacity C11, the negative electrode of diode D8 and the anode of diode D7, and the anode tap of diode D8 draws K2 signal end.The base stage of the negative electrode connecting triode Q5 of diode D7, the collector electrode of triode Q5 is connected to power supply VCC4 by resistance R14 and electric capacity C9, triode Q5 emitter connects anode and the electric capacity C11 of diode D8 by optocoupler U6, optocoupler U6 exports emitter and connects pull down resistor R22, export by electric capacity C12, the differential circuit that diode D11 and resistance R23 form is connected the 3 pin inputs of comparator U4A, the bleeder circuit that+5V power supply consists of resistance R19 and resistance R25 produces the 2 pin inputs that a benchmark level is connected to comparator U4A, electric capacity C13 is connected in parallel on resistance R19 two ends for filtering High-frequency Interference, the 1 pin output of comparator U4A connects a pull-up resistor R15 and filter capacitor C10, export zero cross signal N_Zero to zero passage trigger module 4, K1 signal end and K2 signal end are connected respectively to input a and the output c of electronic switch 2.
During switch ends zero passage signal detection circuit 5 breaker in middle both end voltage K1>>K2, electric current first flows through diode D2 and current-limiting resistance R13, now electric current is enough triode Q5 conducting, then electric current is from current-limiting resistance R13 again through the emitter E of diode D7, triode Q5, then flow to isolation optocoupler U6, and optocoupler conducting is exported high level.
During switch ends zero passage signal detection circuit 5 breaker in middle both end voltage K1>K2, after electric current flows through diode D2 and current-limiting resistance R13, electric current is very little, can not turn-on transistor Q5 and optocoupler U6, so electric current passes through via C11, now U6 optocoupler is in off state.
During switch ends zero passage signal detection circuit 5 breaker in middle both end voltage K2>K1, after electric current flows through diode D8 and current-limiting resistance R13, electric current does not also become greater to can turn-on transistor Q2 and optocoupler U2, so electric current passes through via C3, now U2 also fails conducting.
During switch ends zero passage signal detection circuit 5 breaker in middle both end voltage K2>>K1, after electric current flows through diode D8 and current-limiting resistance R13, electric current is by turn-on transistor Q2, so electric current passes through via the emitter of diode D1, triode Q2, then by optocoupler U2 conducting, high level is exported.
In switch ends zero passage signal detection circuit 5, positive direction using K1 → K2 as switch ends voltage, K1 higher than K2 or K1 lower than in the half period of K2, optocoupler U2, U6 conducting exports high level, due to the effect of the differential circuit that electric capacity C4 and resistance R10 electric capacity C12 and resistance R23 forms, comparator U4A and U4B output low level, when K1 and K2 two ends equipotential, differential circuit produces the input anode of a sawtooth waveforms to comparator, and comparator exports a high level pulse.
Zero cross fired module 4 in embodiment 1 is described below in conjunction with Fig. 3.
Described zero cross fired module 4 comprises d type flip flop U3B, the input D of d type flip flop U3B holds 12 pin to be connected to CPU processor and receives switching control signal Cmd, input CLK holds 11 pin connecting valve two ends zero passage signal detection circuits 5 to receive zero cross signal P_Zero, the input CLR that reversed-phase output 8 pin of d type flip flop U3B connects d type flip flop U3B by resistance R11 holds 13 pin, the input CLR of d type flip flop U3B holds 13 pin to connect electric capacity C7 and electric capacity C8 to power supply ground, positive output end 9 pin of d type flip flop U3B is connected to power supply ground by optocoupler U1 and current-limiting resistance R8, optocoupler U1 exports collector electrode and connects power supply VCC4, the output emitter of optocoupler U1 is connected to the base stage of triode Q1 by resistance R3, the base stage of the emitter connecting triode Q3 of triode Q1, the emitter of triode Q3 exports the G1 pole of triggering signal AG1 to the thyristor VT1 in the first electronic switch 2 by resistance R5 and diode D3, the emitter of triode Q3 is simultaneously also by resistance R5, electric capacity C6 is connected the G1 pole exporting triggering signal AG1 to the thyristor VT1 in the first electronic switch 2 with diode D4, the emitter of triode Q1 and the base stage of triode Q3 are connected the K1 pole of output signal AK1 to the thyristor VT1 in the first electronic switch 2 by resistance R4, output signal AK1 end simultaneously and be connected to triggering signal AG1 end by diode D4.
The input D of d type flip flop U3A holds 2 pin to connect the switching control signal Cmd receiving CPU, input CLK holds the zero cross signal N_Zero of 3 pin connecting valve two ends zero passage signal detection circuits 5, the input CLR that reversed-phase output 6 pin of d type flip flop U3A connects d type flip flop U3A by resistance R24 holds 1 pin, the input CLR of d type flip flop U3A holds 1 pin to connect electric capacity C15 and electric capacity C16 to power supply ground, positive output end 5 pin of d type flip flop U3A is connected to power supply ground by optocoupler U5 and current-limiting resistance R21, optocoupler U5 exports collector electrode and connects VCC3, export emitter is connected to triode Q4 base stage by resistance R16, the base stage of the emitter connecting triode Q6 of triode Q4, the emitter of triode Q6 is by resistance R18, diode D9 exports the G2 pole of triggering signal AG2 to the thyristor VT2 in the first electronic switch 2, the emitter of triode Q4 and the base stage of triode Q6 output signal the K2 pole of thyristor VT2 in AK2 to the first electronic switch 2 by resistance R18, and AK2 is connected to CPU by diode D10 and exports triggering signal AG2 simultaneously.
In zero cross fired module 4, d type flip flop U3B input D holds the Cmd switching control signal of 12 pin to be high level, once the rising edge of zero-crossing pulse P_Zero arrives, the 9 pin positive output ends of d type flip flop U3B export high level makes optocoupler U1 conducting, the electric current that power supply VCC4 produces through optocoupler U1 and resistance R3 makes triode Q1 conducting, triode Q3 also conducting simultaneously, the electric current after two-stage is amplified triggers turn on thyristors by resistance R5 and diode D3; While the 9 pin positive output ends of d type flip flop U3B export high level, reversed-phase output 8 pin output low level, the 13 pin CLR of d type flip flop U3B hold electric capacity C7 and electric capacity C8 to be discharged by resistance R11, after electric capacity C7 and C8 is discharged, the CLR Protection Counter Functions of d type flip flop makes output output low level, thus turn off optocoupler U1 conducting, but thyristor is also in conducting state, like this after half electricity cycle, thyristor can turn off because bear reverse voltage, can repeat said process again at next cycle.The capacitance-resistance parameter that the width exporting driving pulse is made up of resistance R11 and electric capacity C7, C8 is determined; The Cmd switching control signal of 12 pin is held to be low level when d type flip flop U3B inputs D, the 9 pin positive output end output low levels of d type flip flop U3B, optocoupler U1 not conducting; D type flip flop U3A inputs D and holds the Cmd switching control signal of 2 pin to be high level, once the rising edge of zero-crossing pulse N_Zero arrives, the 5 pin positive output ends of d type flip flop U3A export high level makes optocoupler U5 conducting, the electric current that power supply VCC3 entered optocoupler and resistance R16 generation makes triode Q4 conducting, triode Q6 also conducting simultaneously, the electric current after two-stage is amplified triggers turn on thyristors by resistance R18 and diode D9; While the 5 pin positive output ends of d type flip flop U3A export high level, reversed-phase output 6 pin output low level, the 1 pin CLR of d type flip flop U3A holds electric capacity C15 and electric capacity C16 to be discharged by resistance R24, after electric capacity C15 and C16 is discharged, the CLR Protection Counter Functions of d type flip flop makes output output low level, thus turn off optocoupler U5 conducting, but thyristor is also in conducting state, like this after half electricity cycle, thyristor can turn off because bear reverse voltage, can repeat said process again at next cycle.The capacitance-resistance parameter that the width exporting driving pulse is made up of resistance R24 and electric capacity C15, C16 is determined; The Cmd switching control signal of 2 pin is held to be low level when d type flip flop U3A inputs D, the 5 pin positive output end output low levels of d type flip flop U3A, optocoupler U5 not conducting;
Switch ends zero cross detection circuit 5 ＇ in embodiment 1 is described below in conjunction with Fig. 4.
Described switch ends zero passage signal detection circuit 5 ＇ comprises current-limiting resistance R26 one end and connects electric capacity C17, the negative electrode of diode D6 and the anode of diode D12, the base stage of the negative electrode connecting triode Q7 of diode D12, the collector electrode of triode Q7 is connected to power supply VCC1 by resistance R27 and electric capacity C18, triode Q7 emitter draws K3 signal end by the anode tap of anode and electric capacity C17, diode D6 that optocoupler U7 connects diode D6.Optocoupler U7 exports emitter and connects pull down resistor R28, export by electric capacity C19, the differential circuit that diode D13 and resistance R29 form is connected the 3 pin inputs of comparator U8A, the bleeder circuit that+5V power supply consists of resistance R30 and resistance R31 produces the 2 pin inputs that a benchmark level is connected to comparator U8A, electric capacity C20 is used for filtering High-frequency Interference, the 1 pin output of comparator U8A connects a pull-up resistor R32 and filter capacitor C21, exports zero cross signal P_Zero_1 to zero passage trigger module 4 ＇; The current-limiting resistance R26 other end connects electric capacity C25, the negative electrode of diode D16 and the anode of diode D17, and the anode tap of diode D16 draws K4 signal end.The base stage of the negative electrode connecting triode Q10 of diode D17, the collector electrode of triode Q10 is connected to VCC2 by resistance R39 and electric capacity C26, triode Q10 emitter connects anode and the electric capacity C25 of diode D16 by optocoupler U11, optocoupler U11 exports emitter and connects pull down resistor R40, export by electric capacity C27, the differential circuit that diode D18 and resistance R41 form is connected the 5 pin inputs of comparator U8B, the bleeder circuit that+5V power supply consists of resistance R42 and resistance R43 produces the 6 pin inputs that a benchmark level is connected to comparator U8B, electric capacity C28 is used for filtering High-frequency Interference, the 7 pin outputs of comparator U8B connect a pull-up resistor R44 and filter capacitor C29, export zero cross signal N_Zero_1 to zero passage trigger module 4 ＇, K3 signal end and K4 signal end are connected to input a and the output c of electronic switch 2 ＇.
During switch ends zero passage signal detection circuit 5 ＇ breaker in middle both end voltage K3>>K4, electric current first flows through diode D6 and current-limiting resistance R26, now electric current is enough triode Q10 conducting, then electric current is from current-limiting resistance R26 again through the emitter E of diode D17, triode Q10, then flow to isolation optocoupler U11, and optocoupler conducting is exported high level.
During switch ends zero passage signal detection circuit 5 ＇ breaker in middle both end voltage K3>K4, after electric current flows through diode D6 and current-limiting resistance R26, electric current is very little, can not turn-on transistor Q10 and optocoupler U11, so electric current passes through via C25, now optocoupler U11 is in off state.
During switch ends zero passage signal detection circuit 5 ＇ breaker in middle both end voltage K4>K3, after electric current flows through diode D16 and current-limiting resistance R26, electric current does not also become greater to can turn-on transistor Q7 and optocoupler U7, so electric current passes through via C17, now optocoupler U7 also fails conducting.
During switch ends zero passage signal detection circuit 5 ＇ breaker in middle both end voltage K4>>K3, after electric current flows through diode D16 and current-limiting resistance R26, electric current is by turn-on transistor Q7, so electric current passes through via the emitter of diode D12, triode Q7, then by optocoupler U7 conducting, high level is exported.
In switch ends zero passage signal detection circuit 5 ＇, positive direction using K3 → K4 as switch ends voltage, K3 higher than K4 or K3 lower than in the half period of K4, optocoupler U7, U11 conducting exports high level, due to the effect of the differential circuit that electric capacity C19 and resistance R29 electric capacity C27 and resistance R41 forms, comparator U8A and U8B output low level, when K3 and K4 two ends equipotential, differential circuit produces the input anode of a sawtooth waveforms to comparator, and comparator exports a high level pulse.
Below in conjunction with Fig. 5, present embodiment is described, present embodiment is described further zero cross fired module 4 ＇ in execution mode one;
Described zero cross fired module 4 ＇ comprises d type flip flop U9A, the input D of d type flip flop U9A holds 2 pin to be connected to CPU and receives switching control signal Cmd1, input CLK holds the zero cross signal P_Zero_1 of 3 pin connecting valve two ends zero passage signal detection circuit 5 ＇ to hold, the input CLR that reversed-phase output 6 pin of d type flip flop U9A connects d type flip flop U9A by resistance R33 holds 1 pin, the input CLR of d type flip flop U9A holds 1 pin to connect electric capacity C22 and electric capacity C23 to power supply ground, positive output end 5 pin of d type flip flop U9A is connected to power supply ground by optocoupler U10 and current-limiting resistance R34, optocoupler U10 exports collector electrode and connects VCC2, export emitter is connected to triode Q8 base stage by resistance R35, the base stage of the emitter connecting triode Q9 of triode Q8, the emitter of triode Q9 exports the G3 pole of thyristor VT3 in triggering signal CG1 to the second electronic switch 2 ＇ by resistance R38 and diode D14, the emitter of triode Q9 is simultaneously by resistance R38, electric capacity C24 and diode D15 exports the G3 pole of thyristor VT3 in triggering signal CG1 to the second electronic switch 2 ＇, the emitter of triode Q8 and the base stage of triode Q9 are connected by resistance R37 and output signal the K3 pole of CK1 to the thyristor VT3 of the second electronic switch 2 ＇, output signal CK1 end simultaneously and are connected to triggering signal CG1 end by diode D15.
The input D of d type flip flop U9B holds 12 pin to be connected to CPU and receives switching control signal Cmd1, input CLK holds the zero cross signal N_Zero_1 of 11 pin connecting valve two ends zero passage signal detection circuit 5 ＇ to hold, the input CLR that reversed-phase output 8 pin of d type flip flop U9B connects d type flip flop U9B by resistance R45 holds 13 pin, the input CLR of d type flip flop U9B holds 13 pin to connect electric capacity C30 and electric capacity C31 to power supply ground, positive output end 9 pin of d type flip flop U9B is connected to power supply ground by optocoupler U12 and current-limiting resistance R46, optocoupler U12 exports collector electrode and connects VCC1, export emitter is connected to triode Q11 base stage by resistance R47, the base stage of the emitter connecting triode Q12 of triode Q11, the emitter of triode Q12 is by resistance R50, diode D19 exports the G4 pole of the thyristor VT4 of triggering signal CG2 second electronic switch 2 ＇, the emitter of triode Q11 and the base stage of triode Q12 are connected by resistance R49 and output signal the K4 pole of thyristor VT4 in CK2 to the second electronic switch 2 ＇, and synchronous signal CK2 holds and is connected to triggering signal CG2 end by diode D20.
In zero cross fired module 4 ＇, d type flip flop U9A input D holds the Cmd1 switching control signal of 2 pin to be high level, once the rising edge of zero-crossing pulse P_Zero_1 arrives, the 5 pin positive output ends of d type flip flop U9A export high level makes optocoupler U10 conducting, the electric current that VCC2 entered optocoupler and resistance R35 generation makes triode Q8 conducting, triode Q9 also conducting simultaneously, the electric current after two-stage is amplified triggers turn on thyristors by resistance R38 and diode D14; While the 5 pin positive output ends of d type flip flop U9A export high level, reversed-phase output 6 pin output low level, the 1 pin CLR of d type flip flop U9A holds electric capacity C22 and electric capacity C23 to be discharged by resistance R33, after electric capacity C22 and C23 is discharged, the CLR Protection Counter Functions of d type flip flop makes output output low level, thus turn off optocoupler U10 conducting, but thyristor is also in conducting state, like this after half electricity cycle, thyristor can turn off because bear reverse voltage, can repeat said process again at next cycle.The capacitance-resistance parameter that the width exporting driving pulse is made up of resistance R33 and electric capacity C22, C23 is determined; The Cmd1 switching control signal of 2 pin is held to be low level when d type flip flop U9A inputs D, the 5 pin positive output end output low levels of d type flip flop U9A, optocoupler U10 not conducting; D type flip flop U9B inputs D and holds the Cmd1 switching control signal of 12 pin to be high level, once the rising edge of zero-crossing pulse N_Zero_1 arrives, the 9 pin positive output ends of d type flip flop U9B export high level makes optocoupler U12 conducting, the electric current that VCC1 entered optocoupler and resistance R47 generation makes triode Q11 conducting, triode Q12 also conducting simultaneously, the electric current after two-stage is amplified triggers turn on thyristors by resistance R50 and diode D19; While the 9 pin positive output ends of d type flip flop U9B export high level, reversed-phase output 8 pin output low level, the 13 pin CLR of d type flip flop U9B hold electric capacity C30 and electric capacity C31 to be discharged by resistance R45, after electric capacity C30 and C31 is discharged, the CLR Protection Counter Functions of d type flip flop makes output output low level, thus turn off optocoupler U12 conducting, but thyristor is also in conducting state, like this after half electricity cycle, thyristor can turn off because bear reverse voltage, can repeat said process again at next cycle.The capacitance-resistance parameter that the width exporting driving pulse is made up of resistance R45 and electric capacity C30, C31 is determined; The Cmd1 switching control signal of 12 pin is held to be low level when d type flip flop U9B inputs D, the 9 pin positive output end output low levels of d type flip flop U9B, optocoupler U12 not conducting;
Described zero cross fired module 4 or 4 ＇ only sends trigger impulse conducting silicon controlled rectifier switch element in the switch ends voltage zero-cross moment, and do not have continuous impulse to trigger, whole like this circuitry consumes power is very little, and the power consumption of product reduces greatly.
Fig. 8 is the oscillogram of the present embodiment consecutive intervals 20ms switched capacitor, can be found out by accompanying drawing, and the present embodiment fully achieves the continuous switching function of 20ms.
The invention provides a kind of low-power consumption Quick-action type capacitor fling-cut switch with Based Intelligent Control; the method and access of this technical scheme of specific implementation is a lot; the above is only the preferred embodiment of the present invention; should be understood that; for those skilled in the art; under the premise without departing from the principles 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.The all available prior art of each part not clear and definite in the present embodiment is realized.
Claims (5)
1. the low-power consumption Quick-action type capacitor fling-cut switch with Based Intelligent Control, it is characterized in that, comprise three-phase power input end (A1, B1, C1), three-phase control output end (A2, B2, C2), first electronic switch (2) and the second electronic switch (2 ＇), first current transformer (1) and the second current transformer (1 ＇), first switch ends zero passage signal detection circuit (5) and second switch two ends zero passage signal detection circuit (5 ＇), first zero cross fired module (4) and the second zero cross fired module (4 ＇), first current detection circuit (3) and the second current detection circuit (3 ＇), and control unit (8),
Three-phase power input end (A1, B1, C1) comprises first input end (A1), the second input (B1) and the 3rd input (C1);
Three-phase control output end (A2, B2, C2) comprises the first output (A2), the second output (B2) and the 3rd output (C2);
The first current transformer (1) and the first electronic switch (2) is connected in series successively between first input end (A1) and the first output (A2), first input end (A1) is for connecting the A phase power supply of three phase mains input, and the first output (A2) is for connecting the first end of three-phase power capacitor; First current transformer (1) connects the first current detection circuit (3), first switch ends zero passage signal detection circuit (5) is positioned at the first electronic switch (2) two ends, first zero cross fired module (4) is directly connected with the first electronic switch (2), and described control unit (8) connects the first current detection circuit (3), the first switch ends zero passage signal detection circuit (5) and the first zero cross fired module (4) respectively;
Second input (B1) is for connecting the B phase power supply of three phase mains input, and the second output (B2) is for connecting the second end of three-phase power capacitor;
The second current transformer (1 ＇) and the second electronic switch (2 ＇) is connected in series successively between 3rd input (C1) and the 3rd output (C2), 3rd input (C1) is for connecting the C phase power supply of three phase mains input, and the 3rd output (C2) is for being connected to the 3rd end of three-phase power capacitor; Second current transformer (1 ＇) connects the second current detection circuit (3 ＇), second switch two ends zero passage signal detection circuit (5 ＇) is positioned at the second electronic switch (2 ＇) two ends, second zero cross fired module (4 ＇) is directly connected with the second electronic switch (2 ＇), and described control unit (8) connects the second current detection circuit (3 ＇), second switch two ends zero passage signal detection circuit (5 ＇) and the second zero cross fired module (4 ＇) respectively;
Described control unit (8) comprises CPU processor;
Described first switch ends zero passage signal detection circuit (5) comprises current-limiting resistance R13, electric capacity C3, diode D2, diode D1, triode Q2, resistance R1, electric capacity C1, power supply VCC3, optocoupler U2, pull down resistor R9, electric capacity C4, diode D5, resistance R10, comparator U4B, resistance R6, resistance R12, electric capacity C5, pull-up resistor R2, filter capacitor C2, electric capacity C11, diode D8, diode D7, triode Q5, resistance R14, electric capacity C9, power supply VCC4, optocoupler U6, pull down resistor R22, electric capacity C12, diode D11, resistance R23, comparator U4A, resistance R19, resistance R25, electric capacity C13, pull-up resistor R15 and filter capacitor C10, current-limiting resistance R13 one end connects electric capacity C3, the negative electrode of diode D2 and the anode of diode D1, the base stage of the negative electrode connecting triode Q2 of diode D1, the collector electrode of triode Q2 is connected to power supply VCC3 by resistance R1 and electric capacity C1, the emitter of triode Q2 draws by the anode of optocoupler U2 connection diode D2 and the anode tap of electric capacity C3, diode D2 the front end that K1 signal end is connected to the first electronic switch (2), the output emitter of optocoupler U2 connects pull down resistor R9, connected the 5 pin inputs of comparator U4B by the differential circuit of electric capacity C4, diode D5 and resistance R10 composition simultaneously, the bleeder circuit that+5V power supply consists of resistance R6 and resistance R12 produces the 6 pin inputs that a benchmark level is connected to comparator U4B, and electric capacity C5 is connected in parallel on resistance R6 two ends for filtering High-frequency Interference, the 7 pin outputs of comparator U4B connect a pull-up resistor R2 and filter capacitor C2, and export zero cross signal P_Zero to the first zero cross fired module (4) and CPU processor,
The current-limiting resistance R13 other end connects electric capacity C11, the negative electrode of diode D8 and the anode of diode D7, and the anode tap of diode D8 draws the rear end that K2 signal end is connected to the first electronic switch (2); The base stage of the negative electrode connecting triode Q5 of diode D7, the collector electrode of triode Q5 is connected to power supply VCC4 by resistance R14 and electric capacity C9, and the emitter of triode Q5 connects anode and the electric capacity C11 of diode D8 by optocoupler U6; Optocoupler U6 exports emitter and connects pull down resistor R22, simultaneously by electric capacity C12, the differential circuit that diode D11 and resistance R23 forms connects the 3 pin inputs of comparator U4A, the bleeder circuit that+5V power supply consists of resistance R19 and resistance R25 produces the 2 pin inputs that a benchmark level is connected to comparator U4A, and electric capacity C13 is connected in parallel on resistance R19 two ends for filtering High-frequency Interference; The 1 pin output of comparator U4A connects a pull-up resistor R15 and filter capacitor C10, and exports zero cross signal N_Zero to the first zero cross fired module (4);
Described first current detection circuit (3) input connects the first current transformer (1), output is connected to control unit (8), described second current detection circuit (3 ＇) input connects the second current transformer (1 ＇), and output is connected to control unit (8).
2. the low-power consumption Quick-action type capacitor fling-cut switch with Based Intelligent Control according to claim 1, it is characterized in that, the input of described first switch ends zero passage signal detection circuit (5) connects two tip nodes of the first electronic switch (2), and output is connected to the first zero cross fired module (4) and control unit (8); The input at described second switch two ends zero passage signal detection circuit (5 ＇) connects two tip nodes of the second electronic switch (2 ＇), and output is connected to the second zero cross fired module (4 ＇) and control unit (8).
3. the low-power consumption Quick-action type capacitor fling-cut switch with Based Intelligent Control according to claim 1, it is characterized in that, described first zero cross fired module (4) comprises d type flip flop U3B, d type flip flop U3A, resistance R11, electric capacity C7, electric capacity C8, optocoupler U1, current-limiting resistance R8, power supply VCC4, resistance R3, triode Q1, triode Q3, resistance R5, diode D3, electric capacity C6, diode D4, resistance R4, resistance R24, electric capacity C15, electric capacity C16, optocoupler U5, current-limiting resistance R21, power supply VCC3, resistance R16, triode Q4, triode Q6, resistance R18, diode D9 and diode D10, the input D of d type flip flop U3B holds 12 pin to be connected to CPU processor and receives switching control signal Cmd, the input CLK of d type flip flop U3B holds 11 pin to connect the first switch ends zero passage signal detection circuit (5) and receives zero cross signal P_Zero, the input CLR that reversed-phase output 8 pin of d type flip flop U3B connects d type flip flop U3B by resistance R11 holds 13 pin, the input CLR of d type flip flop U3B holds 13 pin to connect electric capacity C7 and electric capacity C8 to power supply ground, positive output end 9 pin of d type flip flop U3B is connected to power supply ground by optocoupler U1 and current-limiting resistance R8, optocoupler U1 exports collector electrode and connects power supply VCC4, the output emitter of optocoupler U1 is connected to the base stage of triode Q1 by resistance R3, the base stage of the emitter connecting triode Q3 of triode Q1, the emitter of triode Q3 exports triggering signal AG1 to the first electronic switch (2) by resistance R5 and diode D3, the emitter of triode Q3 is simultaneously by resistance R5, the connection of electric capacity C6 and diode D4 exports triggering signal AG1 to the first electronic switch (2), the emitter of triode Q1 and the base stage of triode Q3 are connected by resistance R4 and output signal AK1 to the first electronic switch (2), output signal AK1 end simultaneously and be connected to triggering signal AG1 end by diode D4,
The input D of d type flip flop U3A holds 2 pin to receive the switching control signal Cmd of CPU processor, d type flip flop U3A inputs CLK and holds 3 pin to connect the first switch ends zero passage signal detection circuit (5) reception zero cross signal N_Zero, the input CLR that reversed-phase output 6 pin of d type flip flop U3A connects d type flip flop U3A by resistance R24 holds 1 pin, the input CLR of d type flip flop U3A holds 1 pin to connect electric capacity C15 and electric capacity C16 to power supply ground, positive output end 5 pin of d type flip flop U3A is connected to power supply ground by optocoupler U5 and current-limiting resistance R21, optocoupler U5 exports collector electrode and connects power supply VCC3, export emitter is connected to triode Q4 base stage by resistance R16, the base stage of the emitter connecting triode Q6 of triode Q4, the emitter of triode Q6 is by resistance R18, diode D9 exports triggering signal AG2 to the first electronic switch (2), the emitter of triode Q4 and the base stage of triode Q6 are connected by resistance R18 and output signal AK2 to the first electronic switch (2), output signal AK2 end simultaneously and are connected to triggering signal AG2 end by diode D10.
4. the low-power consumption Quick-action type capacitor fling-cut switch with Based Intelligent Control according to claim 1, it is characterized in that, described second switch two ends zero passage signal detection circuit (5 ＇) comprise current-limiting resistance R26, electric capacity C17, diode D6, diode D12, triode Q7, resistance R27, electric capacity C18, power supply VCC1, optocoupler U7, pull down resistor R28, electric capacity C19, diode D13, resistance R29, comparator U8A, resistance R30, resistance R31, electric capacity C20, pull-up resistor R32, filter capacitor C21, electric capacity C25, diode D16, diode D17, triode Q10, resistance R39, electric capacity C26, power supply VCC2, optocoupler U11, pull down resistor R40, electric capacity C27, diode D18, resistance R41, comparator U8B, resistance R42, resistance R43, electric capacity C28, pull-up resistor R44 and filter capacitor C29, current-limiting resistance R26 one end connects electric capacity C17, the negative electrode of diode D6 and the anode of diode D12, the base stage of the negative electrode connecting triode Q7 of diode D12, the collector electrode of triode Q7 is connected to power supply VCC1 by resistance R27 and electric capacity C18, triode Q7 emitter draws by the anode tap of anode and electric capacity C17, diode D6 that optocoupler U7 connects diode D6 the front end that K3 signal end is connected to the second electronic switch (2 ＇), the output emitter of optocoupler U7 connects pull down resistor R28, simultaneously by electric capacity C19, the differential circuit that diode D13 and resistance R29 forms connects the 3 pin inputs of comparator U8A, the bleeder circuit that+5V power supply consists of resistance R30 and resistance R31 produces the 2 pin inputs that a benchmark level is connected to comparator U8A, electric capacity C20 is connected in parallel on resistance R30 two ends, for filtering High-frequency Interference, the 1 pin output of comparator U8A connects a pull-up resistor R32 and filter capacitor C21, export zero cross signal P_Zero_1 to the second zero cross fired module (4 ＇) and CPU processor,
The current-limiting resistance R26 other end connects electric capacity C25, the negative electrode of diode D16 and the anode of diode D17, and the anode tap of diode D16 draws the rear end that K4 signal end is connected to the second electronic switch (2 ＇), the base stage of the negative electrode connecting triode Q10 of diode D17, the collector electrode of triode Q10 is connected to power supply VCC2 by resistance R39 and electric capacity C26, the emitter of triode Q10 connects anode and the electric capacity C25 of diode D16 by optocoupler U11, optocoupler U11 exports emitter and connects pull down resistor R40, simultaneously by electric capacity C27, the differential circuit that diode D18 and resistance R41 forms connects the 5 pin inputs of comparator U8B, the bleeder circuit that+5V power supply consists of resistance R42 and resistance R43 produces the 6 pin inputs that a benchmark level is connected to comparator U8B, electric capacity C28 is connected in parallel on resistance R42 two ends for filtering High-frequency Interference, the 7 pin outputs of comparator U8B connect a pull-up resistor R44 and filter capacitor C29, and export zero cross signal N_Zero_1 to the second zero cross fired module (4 ＇).
5. the low-power consumption Quick-action type capacitor fling-cut switch with Based Intelligent Control according to claim 4, it is characterized in that, described second zero cross fired module (4 ＇) comprises d type flip flop U9A, d type flip flop U9B, resistance R33, electric capacity C22, electric capacity C23, optocoupler U10, current-limiting resistance R34, power supply VCC2, , resistance R35, triode Q8, triode Q9, resistance R38, diode D14, electric capacity C24, diode D15, resistance R37, resistance R45, connect electric capacity C30, electric capacity C31, optocoupler U12, current-limiting resistance R46, power supply VCC1, resistance R47, triode Q11, triode Q12, resistance R50, diode D19, resistance R49 and diode D20, the input D of d type flip flop U9A holds 2 pin to be connected to CPU and receives switching control signal Cmd1, the input CLK of d type flip flop U9A holds 3 pin to connect second switch two ends zero passage signal detection circuit (5 ＇) and receives zero cross signal P_Zero_1, the input CLR that reversed-phase output 6 pin of d type flip flop U9A connects d type flip flop U9A by resistance R33 holds 1 pin, the input CLR of d type flip flop U9A holds 1 pin to connect electric capacity C22 and electric capacity C23 to power supply ground, positive output end 5 pin of d type flip flop U9A is connected to power supply ground by optocoupler U10 and current-limiting resistance R34, optocoupler U10 exports collector electrode and connects power supply VCC2, export emitter is connected to triode Q8 base stage by resistance R35, the base stage of the emitter connecting triode Q9 of triode Q8, the emitter of triode Q9 exports triggering signal CG1 to the second electronic switch (2 ＇) by resistance R38 and diode D14, the emitter of triode Q9 is simultaneously by resistance R38, electric capacity C24 and diode D15 exports triggering signal CG1 to the second electronic switch (2 ＇), the emitter of triode Q8 and the base stage of triode Q9 are connected by resistance R37 and output signal CK1 to the second electronic switch (2 ＇), output signal CK1 end simultaneously and are connected to triggering signal CG1 end by diode D15,
The input D of d type flip flop U9B holds 12 pin to be connected to CPU and receives switching control signal Cmd1, the input CLK of d type flip flop U9B holds 11 pin connection second switch two ends zero passage signal detection circuit (5 ＇) to receive zero cross signal N_Zero_1 and holds, the input CLR that reversed-phase output 8 pin of d type flip flop U9B connects d type flip flop U9B by resistance R45 holds 13 pin, the input CLR of d type flip flop U9B holds 13 pin to connect electric capacity C30 and electric capacity C31 to power supply ground, and positive output end 9 pin of d type flip flop U9B is connected to power supply ground by optocoupler U12 and current-limiting resistance R46; Optocoupler U12 exports collector electrode and connects power supply VCC1, export emitter is connected to triode Q11 base stage by resistance R47, the base stage of the emitter connecting triode Q12 of triode Q11, the emitter of triode Q12 exports triggering signal CG2 to the second electronic switch (2 ＇) by resistance R50, diode D19; The emitter of triode Q11 and the base stage of triode Q12 are connected by resistance R49 and output signal CK2 to the second electronic switch (2 ＇), and synchronous signal CK2 holds and is connected to triggering signal CG2 end by diode D20.
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| CN203326614U (en) * | 2013-07-19 | 2013-12-04 | 江苏南自通华电力自动化有限公司 | Low-power-consumption fast-type capacitor switch with intelligent control |
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Address after: Jiangning District of Nanjing City, Jiangsu Province, 210000 Tong Road No. 101 Patentee after: JIANGSU NICETOWN ELECTRIC POWER AUTOMATION CO., LTD. Patentee after: Jiangsu Huade Electric Power Technology Co., Ltd. Address before: Jiangning District of Nanjing City, Jiangsu Province, 210000 Tong Road No. 101 Patentee before: Jiangsu Nanzitonghua Electric Automation Co., Ltd. Patentee before: Jiangsu Huade Electric Power Technology Co., Ltd. |
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Denomination of invention: Low-power-consumption rapid capacitor switching switch with intelligent control Effective date of registration: 20180503 Granted publication date: 20150610 Pledgee: Bank of China Limited by Share Ltd Jiangsu branch Pledgor: JIANGSU NICETOWN ELECTRIC POWER AUTOMATION CO., LTD.|Jiangsu Huade Electric Power Technology Co., Ltd. Registration number: 2018320000053 |
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Date of cancellation: 20190520 Granted publication date: 20150610 Pledgee: Bank of China Limited by Share Ltd Jiangsu branch Pledgor: JIANGSU NICETOWN ELECTRIC POWER AUTOMATION CO., LTD.|Jiangsu Huade Electric Power Technology Co., Ltd. Registration number: 2018320000053 |