CN103326381A - 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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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 the quick formula capacitor fling-cut switch of a kind of low-power consumption with Based Intelligent Control, particularly a kind ofly can conveniently be applied in various voltage zero-cross and the frequent fling-cut switches of the low-power consumption of quick-switching occasion of needing.
Background technology
In present electric reactive compensating system, be widely used controllable silicon, synchro switch, these several operating passing zero switches of combination switch carry out the voltage zero-cross switching to power capacitor, in order to make the electric capacity impulse current little, must guarantee that switch can accurately connect at voltage over zero, this just requires detection accuracy and the antijamming capability of voltage zero-crossing detection circuit of major loop switch ends strong, and at present commonly used be that bi-directional light electric coupling input is connected with current-limiting resistance, its output output voltage zero cross signal wider width, be carved with larger gap when causing switch connection constantly with actual zero passage, and the development along with modern industry, frequency conversion, being widely used of rectifying installation, harmonic pollution has become the subject matter of the harm quality of power supply, and adopt zero cross detection circuit commonly used at present can accurately not detect zero crossing in the serious occasion of harmonic pollution, repeatedly level chattering can appear near point of zero voltage, thereby cause program chaotic, cause controllable silicon false triggering meeting to produce larger impact surge current, useful life and the reliability of load and switch itself are brought extremely adverse influence.
The circuits for triggering that controllable silicon is commonly used at present extensively adopt metal-oxide-semiconductor or triode pulse transformer, control circuit sends continuous driving pulse constantly at voltage zero-cross, 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 have reduced the useful life of product.
Existing metallurgy, welding machine, to vibrate these trade power consumption load variations fast, and the operational mode that steepness is large, load variations frequency can reach about 20ms faster sometimes, can't carry out effective reactive power compensation, and be extremely unfavorable to operation of power networks and user.
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 with Based Intelligent Control quick formula capacitor fling-cut switch.
In order to solve the problems of the technologies described above, the invention discloses the quick formula capacitor fling-cut switch of a kind of low-power consumption with Based Intelligent Control, comprise 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 ＇), the first current transformer (1) and the second current transformer (1 ＇), the first switch ends zero passage signal detection circuit (5) and second switch two ends zero passage signal detection circuit (5 ＇), the first zero cross fired module (4) and the second zero cross fired module (4 ＇), the first current detection circuit (3) and the second current detection circuit (3 ＇), and control unit (8);
Be connected in series successively the first current transformer (1) and the first electronic switch (2) between first input end (A1) and the first output (A2), first input end (A1) is used for connecting the A phase power supply of three phase mains input, and the first output (A2) is used for connecting the first end of three-phase power capacitor; The first current transformer (1) connects the first current detection circuit (3), the first switch ends zero passage signal detection circuit (5) is positioned at the first electronic switch (2) two ends, the first zero cross fired module (4) directly is connected with the first electronic switch (2), and described control unit (8) connects respectively the first current detection circuit (3), the first switch ends zero passage signal detection circuit (5) and the first zero cross fired module (4);
The second input (B1) is used for connecting the B phase power supply of three phase mains input, and the second output (B2) is used for connecting the second end of three-phase power capacitor;
Be connected in series successively the second current transformer (1 ＇) and the second electronic switch (2 ＇) between the 3rd input (C1) and the 3rd output (C2), the 3rd input (C1) is used for connecting the C phase power supply of three phase mains input, and the 3rd output (C2) is used for being connected to the 3rd end of three-phase power capacitor; The 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, the second zero cross fired module (4 ＇) directly is connected with the second electronic switch (2 ＇), and described control unit (8) connects respectively the second current detection circuit (3 ＇), second switch two ends zero passage signal detection circuit (5 ＇) and the second zero cross fired module (4 ＇).
The 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 the second current detection circuit (3 ＇) input connects the second current transformer (1 ＇), and output is connected to control unit (8).
The input of the first switch ends zero passage signal detection circuit (5) connects two tip nodes of the first electronic switch (2) described in the present invention, and output is connected to the first zero cross fired module (4) and control unit (8); The input of described second switch two ends zero passage signal detection circuits (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 the CPU processor.
The first switch ends zero passage signal detection circuit (5) comprises current-limiting resistance R13 described in the present invention, current-limiting resistance R13 one end connects capacitor C 3, 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 R 1 and capacitor C 1, the emitter of triode Q2 connects anode and the capacitor C 3 of diode D2 by optocoupler U2, the anode tap of diode D2 is drawn the front end that the K1 signal end is connected to the first electronic switch (2); The output emitter of optocoupler U2 connects pull down resistor R9, the differential circuit that forms by capacitor C 4, diode D5 and resistance R 10 simultaneously connects the 5 pin inputs of comparator U4B, + 5V power supply produces the 6 pin inputs that a benchmark level is connected to comparator U4B by the bleeder circuit that resistance R 6 and resistance R 12 form, and capacitor C 5 is connected in parallel on resistance R 6 two ends and is used for the filtering High-frequency Interference; The 7 pin outputs of comparator U4B connect a pull-up resistor R2 and filter capacitor C2, and output zero cross signal P_Zero is an I/O mouth of CPU processor to the input input c of the first zero cross fired module (4) and control unit (8).
The current-limiting resistance R13 other end connects capacitor C 11, the negative electrode of diode D8 and the anode of diode D7, and the anode tap of diode D8 is drawn the rear end that the 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 R 14 and capacitor C 9, and the emitter of triode Q5 connects anode and the capacitor C 11 of diode D8 by optocoupler U6; Optocoupler U6 output emitter connects pull down resistor R22, simultaneously by capacitor C 12, the differential circuit that diode D11 and resistance R 23 form connects the 3 pin inputs of comparator U4A, + 5V power supply produces the 2 pin inputs that a benchmark level is connected to comparator U4A by the bleeder circuit that resistance R 19 and resistance R 25 form, and capacitor C 13 is connected in parallel on resistance R 19 two ends and is used for the filtering High-frequency Interference; The 1 pin output of comparator U4A connects a pull-up resistor R15 and filter capacitor C10, and output zero cross signal N_Zero is to the first zero cross fired module (4).
The first zero cross fired module (4) comprises d type flip flop U3B and d type flip flop U3A described in the present invention, the input D of d type flip flop U3B holds 12 pin to be connected to the 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, reversed-phase output 8 pin of d type flip flop U3B are held 13 pin by the input CLR that resistance R 11 connects d type flip flop U3B, the input CLR of d type flip flop U3B holds 13 pin to connect capacitor C 7 and capacitor C 8 arrives power supply ground, positive output end 9 pin of d type flip flop U3B are connected to power supply ground by optocoupler U1 and current-limiting resistance R8, optocoupler U1 output collector electrode connects power supply VCC4, the output emitter of optocoupler U1 is connected to the base stage of triode Q1 by resistance R 3, the base stage of the emitter connecting triode Q3 of triode Q1, the emitter of triode Q3 is exported triggering signal AG1 to the G1 utmost point of the middle thyristor VT1 of the first electronic switch (2) by resistance R 5 and diode D3, and the emitter of triode Q3 is simultaneously by resistance R 5, the connection output triggering signal AG1 of capacitor C 6 and diode D4 is to the G1 utmost point of the middle thyristor VT1 of the first electronic switch (2); The emitter of triode Q1 is connected with triode Q3 that base stage connects by resistance R 4 and the K1 utmost point of output signal AK1 thyristor VT1 in the first electronic switch (2), and output signal AK1 end is connected to triggering signal AG1 end by diode D4 simultaneously;
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 input CLK holds 3 pin to connect the first switch ends zero passage signal detection circuit (5) and receives zero cross signal N_Zero, reversed-phase output 6 pin of d type flip flop U3A are held 1 pin by the input CLR that resistance R 24 connects d type flip flop U3A, the input CLR of d type flip flop U3A holds 1 pin to connect capacitor C 15 and capacitor C 16 arrives power supply ground, positive output end 5 pin of d type flip flop U3A are connected to power supply ground by optocoupler U5 and current-limiting resistance R21, optocoupler U5 output collector electrode connects VCC3, the output emitter is connected to the base stage of triode Q4 by resistance R 16, the base stage of the emitter connecting triode Q6 of triode Q4, the emitter of triode Q6 is by resistance R 18, diode D9 output triggering signal AG2 is to the G2 utmost point of the middle thyristor VT2 of the first electronic switch (2); The emitter of triode Q4 is connected with triode Q6 that base stage connects by resistance R 18 and the K2 utmost point of output signal AK2 thyristor VT2 in the first electronic switch (2), and output signal AK2 end is connected to triggering signal AG2 end by diode D10 simultaneously.
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 capacitor C 17, 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 R 27 and capacitor C 18, triode Q7 emitter connects anode and the capacitor C 17 of diode D6 by optocoupler U7, the anode tap of diode D6 is drawn the front end that the K3 signal end is connected to the second electronic switch (2 ＇); The output emitter of optocoupler U7 connects pull down resistor R28, simultaneously by capacitor C 19, the differential circuit that diode D13 and resistance R 29 form connects the 3 pin inputs of comparator U8A, + 5V power supply produces the 2 pin inputs that a benchmark level is connected to comparator U8A by the bleeder circuit that resistance R 30 and resistance R 31 form, capacitor C 20 is connected in parallel on resistance R 30 two ends, be used for the filtering High-frequency Interference, the 1 pin output of comparator U8A connects a pull-up resistor R32 and filter capacitor C21, output zero cross signal P_Zero_1 is to the input input d of the second zero cross fired module (4 ＇) and control unit (8), i.e. the CPU processor I/O mouth.
The current-limiting resistance R26 other end connects capacitor C 25, the negative electrode of diode D16 and the anode of diode D17, and the anode tap of diode D16 is drawn the rear end that the 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 R 39 and capacitor C 26, the emitter of triode Q10 connects anode and the capacitor C 25 of diode D16 by optocoupler U11, optocoupler U11 output emitter connects pull down resistor R40, simultaneously by capacitor C 27, the differential circuit that diode D18 and resistance R 41 form connects the 5 pin inputs of comparator U8B, + 5V power supply produces the 6 pin inputs that a benchmark level is connected to comparator U8B by the bleeder circuit that resistance R 42 and resistance R 43 form, and capacitor C 28 is connected in parallel on resistance R 42 two ends and is used for the filtering High-frequency Interference; The 7 pin outputs of comparator U8B connect a pull-up resistor R44 and filter capacitor C29, and output zero cross signal N_Zero_1 is to the second zero cross fired module (4 ＇).
The 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 circuits (5 ＇) and receives zero cross signal P_Zero_1, reversed-phase output 6 pin of d type flip flop U9A are held 1 pin by the input CLR that resistance R 33 connects d type flip flop U9A, the input CLR of d type flip flop U9A holds 1 pin to connect capacitor C 22 and capacitor C 23 arrives power supply ground, positive output end 5 pin of d type flip flop U9A are connected to power supply ground by optocoupler U10 and current-limiting resistance R34, optocoupler U10 output collector electrode connects power supply VCC2, the output emitter is connected to the base stage of triode Q8 by resistance R 35, the base stage of the emitter connecting triode Q9 of triode Q8, the emitter of triode Q9 is exported triggering signal CG1 to the G3 utmost point of the middle thyristor VT3 of the second electronic switch (2 ＇) by resistance R 38 and diode D14, and the emitter of triode Q9 is simultaneously by resistance R 38, capacitor C 24 and diode D15 output triggering signal CG1 are to the G3 utmost point of the middle thyristor VT3 of the second electronic switch (2 ＇); The emitter of triode Q8 is connected with triode Q9 that base stage connects by resistance R 37 and the K3 utmost point of output signal CK1 thyristor VT3 in the second electronic switch (2 ＇), and output signal CK1 end is connected to triggering signal CG1 end by diode D15 simultaneously;
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 to connect second switch two ends zero passage signal detection circuits (5 ＇) and receives zero cross signal N_Zero_1 end, reversed-phase output 8 pin of d type flip flop U9B are held 13 pin by the input CLR that resistance R 45 connects d type flip flop U9B, the input CLR of d type flip flop U9B holds 13 pin to connect capacitor C 30 and capacitor C 31 arrives power supply ground, and positive output end 9 pin of d type flip flop U9B are connected to power supply ground by optocoupler U12 and current-limiting resistance R46; Optocoupler U12 output collector electrode connects VCC1, the output emitter is connected to the base stage of triode Q11 by resistance R 47, the base stage of the emitter connecting triode Q12 of triode Q11, the emitter of triode Q12 is exported triggering signal CG2 to the G4 utmost point of the middle thyristor VT4 of the second electronic switch (2 ＇) by resistance R 50, diode D19; The emitter of triode Q11 is connected with triode Q12 that base stage connects by resistance R 49 and the K4 utmost point of output signal CK2 thyristor VT4 in the second electronic switch (2 ＇), and synchronous signal CK2 end 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 ＇), the 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 widely adaptability and the versatility of zero cross fired module and switch ends zero passage signal detection circuit among the present invention, is convenient to carry out cheaply transformation and optimization.
The present invention adopts two controls, three control modes of two electronic switch control three phase mains, intelligent control unit with the CPU processor carries out intelligent optimization control, for the residual voltage on switch ends and the capacitor in the process of the input that realizes frequent fast switching and switch and excision minimum, control unit carries out the phase sequence detection to the three phase mains of access, correctly controls with state according to the phase sequence of the actual access power supply that detects and indicates; Existing metallurgical, welding machine, vibrate these trade power consumption load variations fast, the operational mode that steepness is large, the load variations frequency can reach about 20ms faster sometimes, can not compensate fast and effectively, simultaneously frequency conversion, a large amount of uses of rectifying installation, Harmfulness Caused by Harmonics is more and more serious, extremely unfavorable to operation of power networks and user, for the switching frequency that guarantees electric capacity can satisfy 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 strong testing circuit of anti-harmonic wave ability, in conjunction with CPU processor in the control unit as logical operation, signal designation and intelligent optimization are controlled to be core, take full advantage of the flexible control characteristics of CPU processor, trigger first C phase electronic switch when adopting input and trigger again A phase electronic switch, excise first the anti-phase triggering technique that A phase electronic switch excises C phase electronic switch again during excision, realize the quick operating passing zero of fling-cut switch, avoided simultaneously impact and the fluctuation of electronic switch in trigger process, and need not consider capacitor residual voltage, only need electric capacity two ends equipotential to get final product, greatly improved the again interval of switching of electric capacity, realize the continuous switching of 20ms fully, can be applicable to the occasion of frequent quick-switching.
Beneficial effect: but the quick formula capacitor fling-cut switch of the low-power consumption with Based Intelligent Control of noiseless when capacitor fling-cut switch of the present invention is a kind of use the, anti-interference strong, fast response time automatic decision and indication fault.
The present invention is take the CPU processor as control core, in conjunction with high sensitivity, zero cross detection circuit control electronic switch that anti-harmonic wave ability is strong, has that voltage zero-cross drops into accurately, little, the anti-interference strong characteristics of shoving, and prolonged electric life; Only adopt and constantly send trigger impulse conducting silicon controlled rectifier switch element at the switch ends voltage zero-cross, do not use continuous impulse 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 the control unit Intelligent Measurement, can in time judge various fault messages and operating state, easy to maintenance.
Description of drawings
Below in conjunction with the drawings and specific embodiments the present invention is done further to specify, above-mentioned and/or otherwise advantage of the present invention will become apparent.
Fig. 1 is the electrical connection diagram of the quick formula capacitor fling-cut switch of the low-power consumption 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 electronic switch 2 inner schematic diagrams of the present invention.
Fig. 7 is the inner schematic diagrams of electronic switch 2 ＇ of the present invention.
Fig. 8 is the oscillogram of interval of the present invention 20ms fast-switching switch.
Embodiment
The quick formula capacitor fling-cut switch of a kind of low-power consumption with Based Intelligent Control of the present invention comprises power supply input A1, B1, C1, control output 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 as required Input Control Element 8 control.Operating state indication 6 is connected the present operating state of demonstration with control unit 8.
The input a of described electronic switch 2 is connected to the A phase power supply of three phase mains input by current transformer 1 access power supply input A1, electronic switch 2 output c are connected to the first end of three-phase power capacitor by control output A2, power supply input B1 directly connects the B phase of three phase mains input, control output B2 is connected to the second end of three-phase power capacitor, the input a of electronic switch 2 ＇ is connected to the C phase power supply of three phase mains input by current transformer 1 ＇ access power supply input C1, electronic switch 2 ＇ output c are connected to the 3rd end of three-phase power capacitor by control output C2.
Described current detection circuit 3 input a connect current transformer 1, and output b is connected to the input e of control unit 8.Described current detection circuit 3 ＇ input a connect current transformer 1 ＇, and output b is connected to the input f of control unit 8.The input a of described switch ends zero passage signal detection circuit 5 and b be input a and the output c of connecting 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 c of control unit 8.
The input a of described switch ends zero passage signal detection circuit 5 ＇ and b be input a and the output c of connecting 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 control unit 8 and the 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 triggering 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 ＇, and the output c of zero cross fired module 4 ＇ is connected to the triggering input b of electronic switch 2 ＇.
Described operating state indication 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 ＇ are comprised of current-limiting resistance, diode, triode, optocoupler and comparator IC, input K1 and K2 are connected to input a and the output c of electronic switch 2, input K3 and K4 are connected to input a and the output c of electronic switch 2 ＇, after processing through differential circuit, the zero cross signal of optocoupler output connects comparator input anode, 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 the zero cross fired module.
Described zero cross fired module 4 or 4 ＇ are by d type flip flop, the isolation optocoupler, drive triode, diode forms, control end a or the b of the input D end connection control unit 8 of d type flip flop, the input clock end connecting valve two ends zero cross detection circuit 5 of d type flip flop or the zero cross signal of 5 ＇ output c, the output Q of d type flip flop is connected to the driving isolation optocoupler, and the output of optocoupler is connected to and drives triode generation trigger impulse.
Described control unit 8 can be identified the phase sequence of supply voltage, and when the power phase mistake, working state indicating circuit 6 shows the locking of phase sequence mistake.
Described control unit 8 can Detection capacitance device electric current, and when condenser current during greater than the overcurrent set point, control unit excises power capacitor work immediately, simultaneously working state indicating circuit 6 indication overcurrent lockings.
Described control unit 8 can be monitored the zero cross signal of switch ends zero cross detection circuit output, can in time judge the working condition of switch, the corresponding operating state of simultaneously working state indicating circuit 6 indications.
When the input operation of control three-phase power capacitor, the control end b of control unit 8 sends first C phase loop and drops into signal to the input a of zero passage trigger module 4 ＇, drop into signal and at B phase and C phase line voltage be moment of zero is connected to electronic switch 2 ＇ by the output c of zero cross fired module 4 ＇ by d type flip flop circuit generation trigger impulse triggering input b, triggering and conducting electronic switch 2 ＇, then the control end a of control unit 8 sends A phase loop again and drops into signal to the input a of zero passage trigger module 4, dropping into signal is the zero moment to produce trigger impulse is connected to electronic switch 2 by the output c of zero cross fired module 4 triggering input b, triggering and conducting electronic switch 2 by the d type flip flop circuit in A phase phase voltage.
When the excision operation of control three-phase power capacitor, the control end a of control unit 8 sends first A phase loop excision signal, electronic switch 2 is zero constantly automatic disconnection 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 ＇ are zero constantly automatic disconnection at current transformer 1 ＇ electric current.
The accurate zero passage signal detection circuit of high accuracy that the present invention adopts photoelectrical coupler and integrated circuit to form with the quick formula capacitor fling-cut switch of the low-power consumption of Based Intelligent Control, have highly sensitive, high conformity and and the strong advantage of antijamming capability, control unit according to external control signal only at switch ends voltage zero-cross time trigger controllable silicon, reduced the heating of driving element, reduce Overall Power Consumption, constantly connect in zero passage owing to switch simultaneously, having reduced the load instantaneous large-current impacts, prolonged the useful life of capacitor, be suitable for electric capacity done in the application scenario of frequent switching and use.
Below in conjunction with Fig. 1 present embodiment is described, the quick formula capacitor fling-cut switch of the described low-power consumption with Based Intelligent Control of present embodiment, it comprises three phase mains input A1, B1, C1, three phase controls output 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 indication 6, external control signal 7, control unit 8.
The input a of described electronic switch 2 is connected to the A phase power supply of three phase mains input by current transformer 1 access power supply input A1, electronic switch 2 output c are connected to the first end of three-phase power capacitor by control output A2, power supply input B1 directly connects the B phase of three phase mains input, control output B2 is connected to the second end of three-phase power capacitor, the input a of electronic switch 2 ＇ is connected to the C phase power supply of three phase mains input by current transformer 1 ＇ access power supply input C1, electronic switch 2 ＇ output c are connected to the 3rd end of three-phase power capacitor by control output C2.
Described current detection circuit 3 input a connect current transformer 1, and output b is connected to the input e of control unit 8.
Described current detection circuit 3 ＇ input a connect current transformer 1 ＇, and output b is connected to the input f of control unit 8.
The input a of described switch ends zero passage signal detection circuit 5 and b be input a and the output c of connecting 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 c of control unit 8.
The input a of described switch ends zero passage signal detection circuit 5 ＇ and b be input a and the output c of connecting 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 control unit 8 and the 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 triggering 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 ＇, and the output c of zero cross fired module 4 ＇ is connected to the triggering input b of electronic switch 2 ＇.
Described operating state indication 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 design for custom circuit, the CPU processor select that ST company of STMicw Electronics produces the chip of model STM32F103RB.
As shown in Figure 6 and Figure 7, in the present embodiment, described electronic switch 2 is to adopt two antiparallel thyristor VT1 and thyristor VT2 to form.Described electronic switch 2 ＇ adopt two antiparallel thyristor VT3 and thyristor VT4 to form.
Fig. 1 is the internal electric connection layout with the quick formula capacitor fling-cut switch of the low-power consumption of Based Intelligent Control, adopt two controls, three control modes of two electronic switch control three-phase power capacitors, when system powers on, the CPU processor at first carries out electrification reset, system initialization work, then whether the 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 mutually all zero passage normal operation then is described; When the invalid C phase of external signal, A still can detect zero passage or zero-crossing pulse cycle mutually greater than 10ms, prove that then circuit breaks down, locking control function is when zero cross signal and power phase normal laggard main program that enters all, detect in real time over voltage, phase shortage and switch running status in the main program.When the CPU processor receives outside input signal, at first according to ordering in launching, trigger first C phase electronic switch and trigger again A phase electronic switch, sense switch state and real-time update show simultaneously; When the CPU processor receives the external mute signal, according to the excision order, excise first A phase electronic switch and excise again C phase electronic switch.Adopt CPU processor control electronic switch flexible, powerful, realize the quick operating passing zero of fling-cut switch, avoided impact and the fluctuation of electronic switch in trigger process simultaneously, and need not consider capacitor residual voltage, only need electric capacity two ends equipotential to get final product, greatly improve the again interval of switching of electric capacity, realized the continuous switching of 20ms fully, can be applicable to the occasion of frequent quick-switching.The CPU processor drops into or excision control, only needs the corresponding high level of output or low level to get final product, and the zero cross fired module produces trigger impulse automatically according to control level and zero cross signal.
Below in conjunction with Fig. 2 switch ends zero cross detection circuit 5. among the embodiment 1 is described
Comprise current-limiting resistance R13 in the described switch ends zero passage signal detection circuit 5, current-limiting resistance R13 one end connects capacitor C 3, 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 R 1 and capacitor C 1, the emitter of triode Q2 connects anode and the capacitor C 3 of diode D2 by optocoupler U2, the anode tap of diode D2 is drawn the K1 signal end.Optocoupler U2 output emitter connects pull down resistor R9, optocoupler U2 output emitter is by capacitor C 4, diode D5 is connected the differential circuit that forms and is connected the 5 pin inputs of comparator U4B with resistance R, + 5V power supply produces the 6 pin inputs that a benchmark level is connected to comparator U4B by the bleeder circuit that resistance R 6 and resistance R 12 form, capacitor C 5 and the resistance R 6 filtering High-frequency Interference that are used in parallel, the 7 pin outputs of comparator U4B connect a pull-up resistor R2 and filter capacitor C2, and output zero cross signal P_Zero is to zero passage trigger module 4; The current-limiting resistance R13 other end connects capacitor C 11, the anode of the negative electrode of diode D8 and diode D7, and the anode tap of diode D8 is drawn the 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 R 14 and capacitor C 9, triode Q5 emitter connects anode and the capacitor C 11 of diode D8 by optocoupler U6, optocoupler U6 output emitter connects pull down resistor R22, output is by capacitor C 12, diode D11 is connected the differential circuit that forms and is connected the 3 pin inputs of comparator U4A with resistance R, + 5V power supply produces the 2 pin inputs that a benchmark level is connected to comparator U4A by the bleeder circuit that resistance R 19 and resistance R 25 form, capacitor C 13 is connected in parallel on resistance R 19 two ends and is used for the filtering High-frequency Interference, the 1 pin output of comparator U4A connects a pull-up resistor R15 and filter capacitor C10, and output zero cross signal N_Zero is 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.
Switch ends voltage K1 in the switch ends zero passage signal detection circuit 5〉〉 during K2, electric current flow through first diode D2 and current-limiting resistance R13, this moment, electric current was enough triode Q5 conducting, then electric current passes through the emitter E of diode D7, triode Q5 again, then flows to isolation optocoupler U6, with optocoupler conducting output high level from current-limiting resistance R13.
Switch ends voltage K1 in the switch ends zero passage signal detection circuit 5〉during K2, electric current is flowed through after diode D2 and the current-limiting resistance R13, and electric current is very little, can not turn-on transistor Q5 and optocoupler U6, so electric current passes through via C11, this moment, the U6 optocoupler was in off state.
Switch ends voltage K2 in the switch ends zero passage signal detection circuit 5〉during K1, electric current is flowed through after diode D8 and the current-limiting resistance R13, and electric current does not also become greater to can turn-on transistor Q2 and optocoupler U2, so electric current passes through via C3, this moment, U2 also failed conducting.
Switch ends voltage K2 in the switch ends zero passage signal detection circuit 5〉〉 during K1, electric current is flowed through after diode D8 and the current-limiting resistance R13, and electric current is turn-on transistor Q2, so electric current passes through via the emitter of diode D1, triode Q2, then with optocoupler U2 conducting, export high level.
In the switch ends zero passage signal detection circuit 5, with the positive direction of K1 → K2 as switch ends voltage, K1 is higher than K2 or K1 is lower than in the half period of K2, optocoupler U2, U6 conducting output high level is because the effect of the differential circuit that capacitor C 4 and resistance R 10 capacitor C 12 and resistance R 23 form, comparator U4A and U4B output low level, when K1 and K2 two ends equipotential, differential circuit produces a sawtooth waveforms to the input anode of comparator, high level pulse of comparator output.
Below in conjunction with Fig. 3 zero cross fired module 4 among the embodiment 1 is described.
Comprise d type flip flop U3B in the described zero cross fired module 4, the input D of d type flip flop U3B holds 12 pin to be connected to the 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, reversed-phase output 8 pin of d type flip flop U3B are held 13 pin by the input CLR that resistance R 11 connects d type flip flop U3B, the input CLR of d type flip flop U3B holds 13 pin to connect capacitor C 7 and capacitor C 8 arrives power supply ground, positive output end 9 pin of d type flip flop U3B are connected to power supply ground by optocoupler U1 and current-limiting resistance R8, optocoupler U1 output collector electrode connects power supply VCC4, the output emitter of optocoupler U1 is connected to the base stage of triode Q1 by resistance R 3, the base stage of the emitter connecting triode Q3 of triode Q1, the emitter of triode Q3 is by the G1 utmost point of the thyristor VT1 of resistance R 5 and diode D3 output triggering signal AG1 in the first electronic switch 2, and the emitter of triode Q3 is simultaneously also by resistance R 5, capacitor C 6 is connected the G1 utmost point of the thyristor VT1 of output triggering signal AG1 in the first electronic switch 2 with diode D4; The emitter of triode Q1 is connected base stage and is connected the K1 utmost point of the thyristor VT1 of output signal AK1 in the first electronic switch 2 by resistance R 4 with triode Q3, output signal AK1 end is connected to triggering signal AG1 end by diode D4 simultaneously.
The input D of d type flip flop U3A holds 2 pin to connect the switching control signal Cmd that receives CPU, input CLK holds the zero cross signal N_Zero of 3 pin connecting valve two ends zero passage signal detection circuits 5, reversed-phase output 6 pin of d type flip flop U3A are held 1 pin by the input CLR that resistance R 24 connects d type flip flop U3A, the input CLR of d type flip flop U3A holds 1 pin to connect capacitor C 15 and capacitor C 16 arrives power supply ground, positive output end 5 pin of d type flip flop U3A are connected to power supply ground by optocoupler U5 and current-limiting resistance R21, optocoupler U5 output collector electrode connects VCC3, the output emitter is connected to the base stage of triode Q4 by resistance R 16, the base stage of the emitter connecting triode Q6 of triode Q4, the emitter of triode Q6 is by resistance R 18, the G2 utmost point of the thyristor VT2 of diode D9 output triggering signal AG2 in the first electronic switch 2; The base stage of the emitter of triode Q4 and triode Q6 is by the K2 utmost point of resistance R 18 output signal AK2 thyristor VT2 in the first electronic switch 2, and AK2 is connected to CPU output triggering signal AG2 by diode D10 simultaneously.
To hold the Cmd switching control signal of 12 pin be high level to d type flip flop U3B input D in the zero cross fired module 4, in case the rising edge of zero-crossing pulse P_Zero arrives, the 9 pin positive output ends output high level of d type flip flop U3B makes optocoupler U1 conducting, power supply VCC4 makes triode Q1 conducting through the electric current of optocoupler U1 and resistance R 3 generations, simultaneously also conducting of triode Q3 triggers the thyristor conducting through the electric current after the two-stage amplification by resistance R 5 and diode D3; When the 9 pin positive output ends of d type flip flop U3B are exported high level, reversed-phase output 8 pin output low levels, 13 pin CLR end capacitor C 7 and the capacitor C 8 of d type flip flop U3B are discharged by resistance R 11, after capacitor C 7 and C8 are discharged, the CLR Protection Counter Functions of d type flip flop makes the output output low level, thereby turn-off optocoupler U1 conducting, but thyristor also is in conducting state, like this after half electricity cycle, thyristor can because bearing reverse voltage turn-offs, can repeat said process again at next cycle.The width of output driving pulse is determined by the capacitance-resistance parameter that resistance R 11 and capacitor C 7, C8 consist of; Be low level when d type flip flop U3B input D holds the Cmd switching control signal of 12 pin, the 9 pin positive output end output low levels of d type flip flop U3B, not conducting of optocoupler U1; It is high level that d type flip flop U3A input D holds the Cmd switching control signal of 2 pin, in case the rising edge of zero-crossing pulse N_Zero arrives, the 5 pin positive output ends output high level of d type flip flop U3A makes optocoupler U5 conducting, the electric current that power supply VCC3 advanced optocoupler and resistance R 16 generations makes triode Q4 conducting, simultaneously also conducting of triode Q6 triggers the thyristor conducting through the electric current after the two-stage amplification by resistance R 18 and diode D9; When the 5 pin positive output ends of d type flip flop U3A are exported high level, reversed-phase output 6 pin output low levels, 1 pin CLR end capacitor C 15 and the capacitor C 16 of d type flip flop U3A are discharged by resistance R 24, after capacitor C 15 and C16 are discharged, the CLR Protection Counter Functions of d type flip flop makes the output output low level, thereby turn-off optocoupler U5 conducting, but thyristor also is in conducting state, like this after half electricity cycle, thyristor can because bearing reverse voltage turn-offs, can repeat said process again at next cycle.The width of output driving pulse is by resistance R 24 and capacitor C 15, and the capacitance-resistance parameter that C16 consists of is determined; Be low level when d type flip flop U3A input D holds the Cmd switching control signal of 2 pin, the 5 pin positive output end output low levels of d type flip flop U3A, not conducting of optocoupler U5;
Below in conjunction with Fig. 4 switch ends zero cross detection circuit 5 ＇ among the embodiment 1 are described.
Comprise among described switch ends zero passage signal detection circuit 5 ＇ that current-limiting resistance R26 one end connects capacitor C 17, the anode of the negative electrode of diode D6 and 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 R 27 and capacitor C 18, triode Q7 emitter connects anode and the capacitor C 17 of diode D6 by optocoupler U7, the anode tap of diode D6 is drawn the K3 signal end.Optocoupler U7 output emitter connects pull down resistor R28, output is by capacitor C 19, diode D13 is connected the differential circuit that forms and is connected the 3 pin inputs of comparator U8A with resistance R, + 5V power supply produces the 2 pin inputs that a benchmark level is connected to comparator U8A by the bleeder circuit that resistance R 30 and resistance R 31 form, capacitor C 20 is used for the filtering High-frequency Interference, the 1 pin output of comparator U8A connects a pull-up resistor R32 and filter capacitor C21, and output zero cross signal P_Zero_1 is to zero passage trigger module 4 ＇; The current-limiting resistance R26 other end connects capacitor C 25, the anode of the negative electrode of diode D16 and diode D17, and the anode tap of diode D16 is drawn the 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 R 39 and capacitor C 26, triode Q10 emitter connects anode and the capacitor C 25 of diode D16 by optocoupler U11, optocoupler U11 output emitter connects pull down resistor R40, output is by capacitor C 27, diode D18 is connected the differential circuit that forms and is connected the 5 pin inputs of comparator U8B with resistance R, + 5V power supply produces the 6 pin inputs that a benchmark level is connected to comparator U8B by the bleeder circuit that resistance R 42 and resistance R 43 form, capacitor C 28 is used for the filtering High-frequency Interference, the 7 pin outputs of comparator U8B connect a pull-up resistor R44 and filter capacitor C29, and output zero cross signal N_Zero_1 is 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 ＇.
Switch ends voltage K3 among switch ends zero passage signal detection circuit 5 ＇〉〉 during K4, electric current flow through first diode D6 and current-limiting resistance R26, this moment, electric current was enough triode Q10 conducting, then electric current passes through the emitter E of diode D17, triode Q10 again, then flows to isolation optocoupler U11, with optocoupler conducting output high level from current-limiting resistance R26.
Switch ends voltage K3 among switch ends zero passage signal detection circuit 5 ＇〉during K4, electric current is flowed through after diode D6 and the current-limiting resistance R26, and electric current is very little, can not turn-on transistor Q10 and optocoupler U11, so electric current passes through via C25, this moment, optocoupler U11 was in off state.
Switch ends voltage K4 among switch ends zero passage signal detection circuit 5 ＇〉during K3, electric current is flowed through after diode D16 and the 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, this moment, optocoupler U7 also failed conducting.
Switch ends voltage K4 among switch ends zero passage signal detection circuit 5 ＇〉〉 during K3, electric current is flowed through after diode D16 and the current-limiting resistance R26, and electric current is turn-on transistor Q7, so electric current passes through via the emitter of diode D12, triode Q7, then with optocoupler U7 conducting, export high level.
Among switch ends zero passage signal detection circuit 5 ＇, with the positive direction of K3 → K4 as switch ends voltage, K3 is higher than K4 or K3 is lower than in the half period of K4, optocoupler U7, U11 conducting output high level is because the effect of the differential circuit that capacitor C 19 and resistance R 29 capacitor C 27 and resistance R 41 form, comparator U8A and U8B output low level, when K3 and K4 two ends equipotential, differential circuit produces a sawtooth waveforms to the input anode of comparator, high level pulse of comparator output.
Below in conjunction with Fig. 5 present embodiment is described, present embodiment is described further zero cross fired module 4 ＇ in the execution mode one;
Comprise d type flip flop U9A among described zero cross fired module 4 ＇, 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 end of 3 pin connecting valve two ends zero passage signal detection circuit 5 ＇, reversed-phase output 6 pin of d type flip flop U9A are held 1 pin by the input CLR that resistance R 33 connects d type flip flop U9A, the input CLR of d type flip flop U9A holds 1 pin to connect capacitor C 22 and capacitor C 23 arrives power supply ground, positive output end 5 pin of d type flip flop U9A are connected to power supply ground by optocoupler U10 and current-limiting resistance R34, optocoupler U10 output collector electrode connects VCC2, the output emitter is connected to the base stage of triode Q8 by resistance R 35, the base stage of the emitter connecting triode Q9 of triode Q8, the emitter of triode Q9 is by the G3 utmost point of resistance R 38 and diode D14 output triggering signal CG1 thyristor VT3 in the second electronic switch 2 ＇, and the emitter of triode Q9 is simultaneously by resistance R 38, the G3 utmost point of capacitor C 24 and diode D15 output triggering signal CG1 thyristor VT3 in the second electronic switch 2 ＇; The emitter of triode Q8 be connected with triode Q9 that base stage connects by resistance R 37 and output signal CK1 to the K3 utmost point of the thyristor VT3 of the second electronic switch 2 ＇, output signal CK1 end is connected to triggering signal CG1 end by diode D15 simultaneously.
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 end of 11 pin connecting valve two ends zero passage signal detection circuit 5 ＇, reversed-phase output 8 pin of d type flip flop U9B are held 13 pin by the input CLR that resistance R 45 connects d type flip flop U9B, the input CLR of d type flip flop U9B holds 13 pin to connect capacitor C 30 and capacitor C 31 arrives power supply ground, positive output end 9 pin of d type flip flop U9B are connected to power supply ground by optocoupler U12 and current-limiting resistance R46, optocoupler U12 output collector electrode connects VCC1, the output emitter is connected to the base stage of triode Q11 by resistance R 47, the base stage of the emitter connecting triode Q12 of triode Q11, the emitter of triode Q12 is by resistance R 50, and diode D19 exports the G4 utmost point of the thyristor VT4 of triggering signal CG2 the second electronic switch 2 ＇; The emitter of triode Q11 is connected with triode Q12 that base stage connects by resistance R 49 and the K4 utmost point of output signal CK2 thyristor VT4 in the second electronic switch 2 ＇, and synchronous signal CK2 end is connected to triggering signal CG2 end by diode D20.
To hold the Cmd1 switching control signal of 2 pin be high level to d type flip flop U9A input D among zero cross fired module 4 ＇, in case the rising edge of zero-crossing pulse P_Zero_1 arrives, the 5 pin positive output ends output high level of d type flip flop U9A makes optocoupler U10 conducting, the electric current that VCC2 advanced optocoupler and resistance R 35 generations makes triode Q8 conducting, simultaneously also conducting of triode Q9 triggers the thyristor conducting through the electric current after the two-stage amplification by resistance R 38 and diode D14; When the 5 pin positive output ends of d type flip flop U9A are exported high level, reversed-phase output 6 pin output low levels, 1 pin CLR end capacitor C 22 and the capacitor C 23 of d type flip flop U9A are discharged by resistance R 33, after capacitor C 22 and C23 are discharged, the CLR Protection Counter Functions of d type flip flop makes the output output low level, thereby turn-off optocoupler U10 conducting, but thyristor also is in conducting state, like this after half electricity cycle, thyristor can because bearing reverse voltage turn-offs, can repeat said process again at next cycle.The width of output driving pulse is by resistance R 33 and capacitor C 22, and the capacitance-resistance parameter that C23 consists of is determined; Be low level when d type flip flop U9A input D holds the Cmd1 switching control signal of 2 pin, the 5 pin positive output end output low levels of d type flip flop U9A, not conducting of optocoupler U10; It is high level that d type flip flop U9B input D holds the Cmd1 switching control signal of 12 pin, in case the rising edge of zero-crossing pulse N_Zero_1 arrives, the 9 pin positive output ends output high level of d type flip flop U9B makes optocoupler U12 conducting, the electric current that VCC1 advanced optocoupler and resistance R 47 generations makes triode Q11 conducting, simultaneously also conducting of triode Q12 triggers the thyristor conducting through the electric current after the two-stage amplification by resistance R 50 and diode D19; When the 9 pin positive output ends of d type flip flop U9B are exported high level, reversed-phase output 8 pin output low levels, 13 pin CLR end capacitor C 30 and the capacitor C 31 of d type flip flop U9B are discharged by resistance R 45, after capacitor C 30 and C31 are discharged, the CLR Protection Counter Functions of d type flip flop makes the output output low level, thereby turn-off optocoupler U12 conducting, but thyristor also is in conducting state, like this after half electricity cycle, thyristor can because bearing reverse voltage turn-offs, can repeat said process again at next cycle.The width of output driving pulse is by resistance R 45 and capacitor C 30, and the capacitance-resistance parameter that C31 consists of is determined; Be low level when d type flip flop U9B input D holds the Cmd1 switching control signal of 12 pin, the 9 pin positive output end output low levels of d type flip flop U9B, not conducting of optocoupler U12;
Described zero cross fired module 4 or 4 ＇ only send trigger impulse conducting silicon controlled rectifier switch element constantly at the switch ends voltage zero-cross, do not have continuous impulse to trigger, and 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 find out by accompanying drawing, and the present embodiment has been realized the continuous switching function of 20ms fully.
The invention provides the quick formula capacitor fling-cut switch of a kind of low-power consumption with Based Intelligent Control; method and the approach of this technical scheme of specific implementation are a lot; the above only is preferred implementation of the present invention; should be understood that; for those skilled in the art; under the prerequisite that does not break away from the principle of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.In the present embodiment not clear and definite each part all available prior art realized.
Claims (8)
1. quick formula capacitor fling-cut switch of the low-power consumption 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), the first electronic switch (2) and the second electronic switch (2 ＇), the first current transformer (1) and the second current transformer (1 ＇), the first switch ends zero passage signal detection circuit (5) and second switch two ends zero passage signal detection circuit (5 ＇), the first zero cross fired module (4) and the second zero cross fired module (4 ＇), the first current detection circuit (3) and the second current detection circuit (3 ＇), and control unit (8);
Be connected in series successively the first current transformer (1) and the first electronic switch (2) between first input end (A1) and the first output (A2), first input end (A1) is used for connecting the A phase power supply of three phase mains input, and the first output (A2) is used for connecting the first end of three-phase power capacitor; The first current transformer (1) connects the first current detection circuit (3), the first switch ends zero passage signal detection circuit (5) is positioned at the first electronic switch (2) two ends, the first zero cross fired module (4) directly is connected with the first electronic switch (2), and described control unit (8) connects respectively the first current detection circuit (3), the first switch ends zero passage signal detection circuit (5) and the first zero cross fired module (4);
The second input (B1) is used for connecting the B phase power supply of three phase mains input, and the second output (B2) is used for connecting the second end of three-phase power capacitor;
Be connected in series successively the second current transformer (1 ＇) and the second electronic switch (2 ＇) between the 3rd input (C1) and the 3rd output (C2), the 3rd input (C1) is used for connecting the C phase power supply of three phase mains input, and the 3rd output (C2) is used for being connected to the 3rd end of three-phase power capacitor; The 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, the second zero cross fired module (4 ＇) directly is connected with the second electronic switch (2 ＇), and described control unit (8) connects respectively the second current detection circuit (3 ＇), second switch two ends zero passage signal detection circuit (5 ＇) and the second zero cross fired module (4 ＇).
2. the quick formula capacitor fling-cut switch of the low-power consumption with Based Intelligent Control according to claim 1, it is characterized in that, described the first current detection circuit (3) input connects the first current transformer (1), output is connected to control unit (8), described the second current detection circuit (3 ＇) input connects the second current transformer (1 ＇), and output is connected to control unit (8).
3. the quick formula capacitor fling-cut switch of the low-power consumption with Based Intelligent Control according to claim 1, it is characterized in that, the input of described 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 of described second switch two ends zero passage signal detection circuits (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).
4. the quick formula capacitor fling-cut switch of the low-power consumption with Based Intelligent Control according to claim 1 is characterized in that, described control unit (8) comprises the CPU processor.
5. the quick formula capacitor fling-cut switch of the low-power consumption with Based Intelligent Control according to claim 4, it is characterized in that, described the first switch ends zero passage signal detection circuit (5) comprises current-limiting resistance R13, current-limiting resistance R13 one end connects capacitor C 3, the anode of the negative electrode of diode D2 and 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 R 1 and capacitor C 1, the emitter of triode Q2 connects anode and the capacitor C 3 of diode D2 by optocoupler U2, the anode tap of diode D2 is drawn the front end that the K1 signal end is connected to the first electronic switch (2); The output emitter of optocoupler U2 connects pull down resistor R9, the differential circuit that forms by capacitor C 4, diode D5 and resistance R 10 simultaneously connects the 5 pin inputs of comparator U4B, + 5V power supply produces the 6 pin inputs that a benchmark level is connected to comparator U4B by the bleeder circuit that resistance R 6 and resistance R 12 form, and capacitor C 5 is connected in parallel on resistance R 6 two ends and is used for the filtering High-frequency Interference; The 7 pin outputs of comparator U4B connect a pull-up resistor R2 and filter capacitor C2, and output zero cross signal P_Zero is to the first zero cross fired module (4) and CPU processor;
The current-limiting resistance R13 other end connects capacitor C 11, the negative electrode of diode D8 and the anode of diode D7, and the anode tap of diode D8 is drawn the rear end that the 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 R 14 and capacitor C 9, and the emitter of triode Q5 connects anode and the capacitor C 11 of diode D8 by optocoupler U6; Optocoupler U6 output emitter connects pull down resistor R22, simultaneously by capacitor C 12, the differential circuit that diode D11 and resistance R 23 form connects the 3 pin inputs of comparator U4A, + 5V power supply produces the 2 pin inputs that a benchmark level is connected to comparator U4A by the bleeder circuit that resistance R 19 and resistance R 25 form, and capacitor C 13 is connected in parallel on resistance R 19 two ends and is used for the filtering High-frequency Interference; The 1 pin output of comparator U4A connects a pull-up resistor R15 and filter capacitor C10, and output zero cross signal N_Zero is to the first zero cross fired module (4).
6. the quick formula capacitor fling-cut switch of the low-power consumption with Based Intelligent Control according to claim 5, it is characterized in that, described 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 the 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, reversed-phase output 8 pin of d type flip flop U3B are held 13 pin by the input CLR that resistance R 11 connects d type flip flop U3B, the input CLR of d type flip flop U3B holds 13 pin to connect capacitor C 7 and capacitor C 8 arrives power supply ground, positive output end 9 pin of d type flip flop U3B are connected to power supply ground by optocoupler U1 and current-limiting resistance R8, optocoupler U1 output collector electrode connects power supply VCC4, the output emitter of optocoupler U1 is connected to the base stage of triode Q1 by resistance R 3, the base stage of the emitter connecting triode Q3 of triode Q1, the emitter of triode Q3 is exported triggering signal AG1 to the first electronic switch (2) by resistance R 5 and diode D3, the emitter of triode Q3 is simultaneously by resistance R 5, the connection output triggering signal AG1 of capacitor C 6 and diode D4 is to the first electronic switch (2), the emitter of triode Q1 be connected with triode Q3 that base stage connects by resistance R 4 and output signal AK1 to the first electronic switch (2), output signal AK1 end is connected to triggering signal AG1 end by diode D4 simultaneously;
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 input CLK holds 3 pin to connect the first switch ends zero passage signal detection circuit (5) and receives zero cross signal N_Zero, reversed-phase output 6 pin of d type flip flop U3A are held 1 pin by the input CLR that resistance R 24 connects d type flip flop U3A, the input CLR of d type flip flop U3A holds 1 pin to connect capacitor C 15 and capacitor C 16 arrives power supply ground, positive output end 5 pin of d type flip flop U3A are connected to power supply ground by optocoupler U5 and current-limiting resistance R21, optocoupler U5 output collector electrode connects VCC3, the output emitter is connected to the base stage of triode Q4 by resistance R 16, the base stage of the emitter connecting triode Q6 of triode Q4, the emitter of triode Q6 is by resistance R 18, AG2 is to the first electronic switch (2) for diode D9 output triggering signal; The emitter of triode Q4 be connected with triode Q6 that base stage connects by resistance R 18 and output signal AK2 to the first electronic switch (2), output signal AK2 end is connected to triggering signal AG2 end by diode D10 simultaneously.
7. the quick formula capacitor fling-cut switch of the low-power consumption with Based Intelligent Control according to claim 4, it is characterized in that, described second switch two ends zero passage signal detection circuit (5 ＇) comprise current-limiting resistance R26, current-limiting resistance R26 one end connects capacitor C 17, the anode of the negative electrode of diode D6 and 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 R 27 and capacitor C 18, triode Q7 emitter connects anode and the capacitor C 17 of diode D6 by optocoupler U7, the anode tap of diode D6 is drawn the front end that the K3 signal end is connected to the second electronic switch (2 ＇); The output emitter of optocoupler U7 connects pull down resistor R28, simultaneously by capacitor C 19, the differential circuit that diode D13 and resistance R 29 form connects the 3 pin inputs of comparator U8A, + 5V power supply produces the 2 pin inputs that a benchmark level is connected to comparator U8A by the bleeder circuit that resistance R 30 and resistance R 31 form, capacitor C 20 is connected in parallel on resistance R 30 two ends, be used for the filtering High-frequency Interference, the 1 pin output of comparator U8A connects a pull-up resistor R32 and filter capacitor C21, and output zero cross signal P_Zero_1 is to the second zero cross fired module (4 ＇) and CPU processor;
The current-limiting resistance R26 other end connects capacitor C 25, the negative electrode of diode D16 and the anode of diode D17, and the anode tap of diode D16 is drawn the rear end that the 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 R 39 and capacitor C 26, the emitter of triode Q10 connects anode and the capacitor C 25 of diode D16 by optocoupler U11, optocoupler U11 output emitter connects pull down resistor R40, simultaneously by capacitor C 27, the differential circuit that diode D18 and resistance R 41 form connects the 5 pin inputs of comparator U8B, + 5V power supply produces the 6 pin inputs that a benchmark level is connected to comparator U8B by the bleeder circuit that resistance R 42 and resistance R 43 form, and capacitor C 28 is connected in parallel on resistance R 42 two ends and is used for the filtering High-frequency Interference; The 7 pin outputs of comparator U8B connect a pull-up resistor R44 and filter capacitor C29, and output zero cross signal N_Zero_1 is to the second zero cross fired module (4 ＇).
8. the quick formula capacitor fling-cut switch of the low-power consumption with Based Intelligent Control according to claim 7, it is characterized in that, described the second zero cross fired module (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 circuits (5 ＇) and receives zero cross signal P_Zero_1, reversed-phase output 6 pin of d type flip flop U9A are held 1 pin by the input CLR that resistance R 33 connects d type flip flop U9A, the input CLR of d type flip flop U9A holds 1 pin to connect capacitor C 22 and capacitor C 23 arrives power supply ground, positive output end 5 pin of d type flip flop U9A are connected to power supply ground by optocoupler U10 and current-limiting resistance R34, optocoupler U10 output collector electrode connects power supply VCC2, the output emitter is connected to the base stage of triode Q8 by resistance R 35, the base stage of the emitter connecting triode Q9 of triode Q8, the emitter of triode Q9 is exported triggering signal CG1 to the second electronic switch (2 ＇) by resistance R 38 and diode D14, and the emitter of triode Q9 is simultaneously by resistance R 38, capacitor C 24 and diode D15 output triggering signal CG1 are to the second electronic switch (2 ＇); The emitter of triode Q8 be connected with triode Q9 that base stage connects by resistance R 37 and output signal CK1 to the second electronic switch (2 ＇), output signal CK1 end is connected to triggering signal CG1 end by diode D15 simultaneously;
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 to connect second switch two ends zero passage signal detection circuits (5 ＇) and receives zero cross signal N_Zero_1 end, reversed-phase output 8 pin of d type flip flop U9B are held 13 pin by the input CLR that resistance R 45 connects d type flip flop U9B, the input CLR of d type flip flop U9B holds 13 pin to connect capacitor C 30 and capacitor C 31 arrives power supply ground, and positive output end 9 pin of d type flip flop U9B are connected to power supply ground by optocoupler U12 and current-limiting resistance R46; Optocoupler U12 output collector electrode connects VCC1, the output emitter is connected to the base stage of triode Q11 by resistance R 47, the base stage of the emitter connecting triode Q12 of triode Q11, the emitter of triode Q12 is exported triggering signal CG2 to the second electronic switch (2 ＇) by resistance R 50, diode D19; The emitter of triode Q11 be connected with triode Q12 that base stage connects by resistance R 49 and output signal CK2 to the second electronic switch (2 ＇), synchronous signal CK2 end is connected to triggering signal CG2 end by diode D20.
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