CN101882927B - Soft switch device of alternating current solid-state power controller - Google Patents
Soft switch device of alternating current solid-state power controller Download PDFInfo
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Abstract
The invention relates to a soft switch device of an alternating current solid-state power controller, which is characterized in that the soft switch device comprises a power circuit and a control circuit, wherein the control circuit receives input control signals, carries out zero-crossing detection on the control signals and current signals CUR and voltage signals VOL obtained through sampling by the power circuit, and outputs power switch tube driving signals QG to the power circuit. The soft switch device of the alternating current solid-state power controller provided by the invention uses power MOSFET tubes for replacing a bidirectional thyristor to be used as a main switch device of the AC SSPC, the defects of the thyristor can be overcome, the soft switch control of the AC SSPC can be realized, and the invention realizes the effects that the two main power MOSFETs share one driving circuit, and the two MOSFETs can be conducted at the same time at the power voltage zero-passing point; and the two MOSFETs are powered off at the same time at the zero-passing point of current flowing through the power tubes.
Description
Technical field
The present invention relates to a kind of soft switch device of alternating current solid-state power controller, belong to the connecting and disconnecting of the circuit automatic control equipment.
Background technology
Solid-state power controller (Solid-State Power Controller; SSPC) be the intelligent switch device that constitutes by semiconductor device; Be used to be switched on or switched off circuit, realize circuit protection and accept the control signal of prime computer and report its working state signal.Its effect is similar with association or other control protectors that the hot automatic switch of traditional mechanical, fuse are connected with relay; But on performance and function, be superior to these traditional devices greatly: it is make-and-break contact and do not produce electric arc fast; Thereby high-level performance is good, is particularly suitable for aerospace applications; Its inside does not have movable part, does not therefore produce mechanical wear, and failure rate is low, and reliability is high; Press anti-delay characteristic " tripping operation " during overload, protection electrical load equipment and circuit; Be provided with the electrical isolation measure, antijamming capability is strong etc.
[1]As far back as the seventies in last century, the SSPC that abroad just begins one's study, but do not obtain practical application for many years yet.Its main cause is that transistorized at that time on-state voltage drop is big, reaches 0.4 volt～0.5 volt, and on-state loss is much larger than contact switch.In recent years, power electronic technology has had breakthrough, and the on state resistance of metal-oxide-semiconductor device is the milliohm level only, for condition has been created in the development of SSPC.SSPC adopts on the type aircraft abroad in a large number at present.
In exchanging SSPC, the soft switch technique of conducting of power switch pipe no-voltage and zero-current switching is a key technology.
Traditional hard switching circuit because the time-delay of switching device makes voltage and current that suitable intersection arranged, has caused very big power loss in moment of conducting and shutoff like this.Soft switch technique exactly before switching tube is opened, makes voltage drop to zero, realizes that no-voltage is open-minded; Before switching tube turn-offs, make its electric current be reduced to zero, realize zero-current switching.
Soft switch technique not only can effectively reduce the turn-off power loss of opening of switching tube; Can also reduce opening voltage, the current spike that the sudden change of shutdown moment owing to electric current and voltage causes that too high dv/dt, di/dt produce; Thereby avoid the switching tube running orbit to exceed safety operation area (SOA); Guarantee the reliability service of switching tube, also can reduce the serious electromagnetic interference that produces by too high di/dt, dv/dt simultaneously.
The main power tube of at present external alternating current solid-state power controller product all adopts bidirectional thyristor, for example the P111 of LEACH company series alternating current solid-state power controller
[2]SSPC 90000 series of products with NHI company
[3]Bidirectional thyristor has advantages such as volume is little, in light weight, capacity is high, control characteristic is good as power semiconductor device.Bidirectional thyristor can realize that the electric current natural zero-crossing turn-offs, the flip chip of special use configuration in, and the MOC3061 of Motorola Inc.'s production for example, bidirectional thyristor also can realize easily that no-voltage is open-minded.
Though it is fashionable that bidirectional thyristor is applied to alternating-current field, can realize that no-voltage is opened and the shutoff of electric current natural zero-crossing, when bidirectional thyristor is used as the power switch of alternating current solid-state power controller, also brought some problems:
(1) big short circuit current fault takes place when alternating current solid-state power controller; The protection cut-off signals is sent in protective circuit action immediately, but bidirectional thyristor could turn-off still will wait until current over-zero the time; This will cause the short circuit current duration long, the longest sustainable half period of short circuit current.
(2) its conduction voltage drop of the internal structure of thyristor decision is bigger, and its conduction voltage drop is the pressure drop of two transistor base emitter-base bandgap gradings basically, is equivalent to the pressure drop of two PN junctions.
(3) thyristor service time is about 1～4.5 delicately, but its turn-off time is longer, and about hundreds of is delicate, and this is because close and have no progeny, and that extracts minority carrier and charge carrier compoundly all needs a period of time.So the operating frequency of bidirectional triode thyristor is lower, generally be used for the occasion below the 400Hz, this does not satisfy the demand of aircraft AC frequency conversion power-supply system.
Above-mentioned these effects limit the use of bidirectional thyristor in solid-state power controller.Particularly the thyristor conduction voltage drop is big, has caused existing alternating current solid-state power controller only can be used for the small-power occasion, and along with the increase of load current, the power consumption of thyristor significantly increases, and the pipe heating is serious.Therefore along with the development of China's Aero-Space cause, pressing for development is the alternating current solid-state power controller of master power switch with the novel electric power electric device.
Along with the development of power electronic technology, power MOSFET is cut gradually and is appeared, because it is the voltage-type control device; Have very high input impedance, driving power is little, and switching speed is fast, conducting resistance is little; And conducting resistance is a positive temperature coefficient; Be prone to parallel connection, these advantages make power MOSFET possibly replace bidirectional thyristor, become the main switching device of novel alternating current solid-state power controller.
MOSFET is commonly used to make dc switch, in the DC circuit, gives between grid and the source electrode of MOSFET and adds suitable control voltage, can carry out break-make control to load.MOSFET also can control alternating current circuit, because its structural parasitic diode when therefore single MOSFET is as alternating-current switch, only can be controlled positive half period, the negative half-cycle electric current can be connected circuit through parasitic diode.Therefore power MOSFET is not suitable for direct switch AC waveform.
The combinational circuit that disposes a tandem junction structure can solve the control of power MOSFET to AC wave shape, and this combinational circuit is as shown in Figure 1.Two power MOSFET differential concatenations, MOS1 and MOS2 source electrode are connected together.The endoparasitic inverse parallel diode of MOSFET prevents conducting simultaneously each other.The raceway groove of power MOSFET is a bidirectional switch; Promptly apply suitable control voltage; MOSFET oppositely also can conduction current; As long as the voltage on the raceway groove is less than the voltage on the internal body diodes (this voltage generally is higher than the voltage of discrete diode), then most of electric current will flow through the raceway groove of power MOSFET, and not flow through inner diode.During contactor conducting therefore shown in Figure 1, can realize low switch pressure drop.
Adopt the switching tube of power MOSFET,, also brought the problem that is difficult to realize soft switch thereupon though can overcome the shortcoming of aforesaid thyristor as alternating current solid-state power controller.Therefore " no-voltage is opened and zero-current switching " that drive circuit that must design special is realized circuit.
The controlling and driving signal of two MOSFET is not to send simultaneously in the circuit, and needs organically to combine with the positive-negative half-cycle of AC power, according to the break-make of certain order control MOSFET.When power tube is in cut-off state, when AC power is in positive half cycle, sends at first for the following pipe MOS2 of anti-series structure and open signal, let its conducting, still keep off state and go up pipe MOS1, this moment, whole loop still was in cut-off state, did not have electric current to flow through; When AC power forwarded negative half period to by positive half cycle, major loop had electric current to flow through in the moment of AC power zero passage, and circulation path is the conducting channel of MOS2 and the endobiosis diode D1 of MOS1; Be operated between negative half-cycle in AC power, send Continuity signal for last pipe MOS1 pipe, the electric current among the D1 just naturally the change of current to the conducting channel (pressure drop of supposition conducting channel is less, and deficiency is so that endobiosis diode current flow clamp) of MOS1.So just, realized the opening process of alternating current solid-state power controller; Can know by above-mentioned analysis; It is open-minded that power tube belongs to natural zero-crossing, so the zero passage precision is good, and zero passage is error free; And this control strategy requires not harshly to the detection of zero crossing, only needs in half period, to give corresponding MOSFET to send to open signal to get final product.If AC power is when being in negative half period, according to same reason, at first open signal sending out between negative half-cycle pipe MOS1, forward positive half cycle at power supply then and send for down pipe to open signal and get final product.
The turn off process of this control method is that pipe MOS2 sends cut-off signals if when load is in positive half cycle, give down; Make its shutoff; Last pipe MOS1 still keeps conducting; To endobiosis diode D2, alternating current solid-state power controller still keeps conducting state to the electric current that this moment, MOS2 managed by the natural change of current of its conducting channel; When load current forwarded negative half period work to by positive half cycle, loop current was stoped by diode D2, does not have electric current to flow through in the major loop, only needed to send cut-off signals for last pipe MOS1 then and got final product.In like manner,, need to send cut-off signals for earlier last pipe MOS1, when load current forwards positive half cycle to, send cut-off signals for again down pipe MOS2 and get final product if load current is when being in negative half period.This control strategy so can realize accurate no-voltage conducting of alternating current solid-state power controller and zero-current switching function, has suppressed to open du/dt and the di/dt when turn-offing because conducting is the natural zero-crossing place at AC signal with turn-offing fully.
The shortcoming of this control method is that Drive and Control Circuit is complicated, and the Drive and Control Circuit of two power tube MOS1 and MOS2 needs separately separately design, and this meeting cause adverse effect to the functional reliability and the device volume of alternating current solid-state power controller.
As previously mentioned; Bidirectional thyristor is used for the main switching device of alternating current solid-state power controller; Owing to himself structure and ripe supporting chip for driving; Can realize relatively easily that no-voltage is opened and zero-current switching, but the bidirectional thyristor conduction voltage drop is big, short-circuit protection can not in time turn-off and low these drawbacks limit of operating frequency its application in solid-state power controller.
If adopt power MOSFET to replace bidirectional thyristor; Though can overcome the shortcoming of aforesaid thyristor; But also brought the problem that is difficult to realize soft switch thereupon; Existing method Drive and Control Circuit is complicated, causes the device functional reliability to reduce, and has equally also limited its application in solid-state power controller.
Summary of the invention
Weak point for fear of prior art; The present invention proposes a kind of soft switch device of alternating current solid-state power controller; Make the shared drive circuit of MOS1 and MOS2; As long as drive circuit sends control signal, two pipes are just opened simultaneously or are broken off simultaneously, realize the no-voltage conducting and the zero-current switching of alternating current solid-state power controller.
A kind of soft switch device of alternating current solid-state power controller; It is characterized in that comprising power circuit and control circuit; Control circuit receives the control signal of input; With this control signal and the current signal CUR and the voltage signal VOL that are obtained by the power circuit sampling, and power output switching tube drive signal QG gives power circuit; Said control circuit comprises testing circuit, DSP circuit and CPLD circuit; Testing circuit carries out zero passage detection to the voltage signal VOL and the current signal CUR of AC power in the loop, sends zero cross signal to the CPLD circuit when any the zero cross signal value occurs in two kinds of signals; What the DSP circuit received upper input opens the shutoff control signal, sends the break-make control signal to the CPLD circuit; The electric current and voltage zero cross signal that control signal that the CPLD circuit sends the DSP circuit and testing circuit send carries out logical calculated, sends the soft switching drive signal QG of power tube then; Described power circuit comprises MOSFET pipe and biasing resistor, two MOSFET pipe Q
0And Q
1Differential concatenation forms main switch, capacitor C
0And resistance R
6Series connection is with Q
0And Q
1Drain electrode be connected, form the absorption protective circuit be parallel to the main switch two ends; Resistance R
4And R
5With the main switch parallel connection, form the major loop bleeder circuit, the ac voltage signal VO1 of loop of power circuit is provided to control circuit; Sampling resistor R
7Be series at power circuit, the current conversion that will flow through power circuit is given control circuit for voltage signal CUR.
Described testing circuit comprises voltage detecting circuit and current detection circuit; Described voltage detecting circuit constitutes see-saw circuit by operational amplifier LM741; The major loop ac voltage signal VOL that obtains is amplified; Signal after amplifying is delivered to photoelectrical coupler HCPL-3700 and is carried out zero passage detection, sends pulse signal VZ00 at the supply voltage zero crossing; R
38And R
18Voltage signal CUR on the major loop sampling resistor is carried out being input to after the dividing potential drop VIN+ and the VIN-of HCPL-788J, R
18With amplitude diode D
6, D
7Between the VIN+ and VIN-of parallel connection and HCPL-788J, the VREF pin connects the reference voltage of 3V, and HCPL-788J isolates the amplification back from VOUT output, through R to input signal
34, R
35And R
36Deliver to 2 pins of voltage comparator U1A and 5 pins of U1B, the comparative level of 1.5V puts on 3 pins of comparator U1A and 6 pins of U1B; The series circuit of capacitor C 18 and R16 is at the output of U1A, and parallelly connected R with ground
28With diode D
4, capacitor C
19 and R
17Series circuit at the output of U1B, and parallelly connected R with ground
29With diode D
5
The soft switch device of the alternating current solid-state power controller that the present invention proposes; Replace bidirectional thyristor with power MOSFET tube,, can overcome the shortcoming of aforesaid thyristor as the main switching device that exchanges SSPC; Can realize exchanging the soft switch control of SSPC again; Accomplish two shared drive circuits of main power MOSFET tube, at the supply voltage zero crossing, two pipe conductings simultaneously; Flowing through the current zero-crossing point of power tube, two pipes turn-off simultaneously.
Description of drawings
Fig. 1: power MOSFET alternating-current switch of the prior art;
Fig. 2: the alternating current solid-state power controller soft switch device theory diagram that the present invention proposes;
Fig. 3: power circuit schematic diagram in the alternating current solid-state power controller soft switch device that the present invention proposes;
Fig. 4: control circuit theory diagram in the alternating current solid-state power controller soft switch device that the present invention proposes;
Fig. 5: voltage detecting circuit schematic diagram;
Fig. 6: current detection circuit schematic diagram;
Fig. 7: CPLD inside circuit schematic diagram;
Fig. 8: exchange the SSPC no-voltage and open oscillogram;
Fig. 9: exchange SSPC zero-current switching oscillogram.
Embodiment
Combine embodiment, accompanying drawing that the present invention is further described at present:
The power circuit schematic diagram is as shown in Figure 3, and this circuit design rated current is 10A, after the consideration allowance, and main switch Q
0And Q
1Select the MOSFET pipe IXKH70N60 of German IXYS company, the rated current of this power tube is 70A; Absorb the capacitor C of protective circuit
0Choose 0.1 μ F, resistance R
6Choose 47 Ω; Sampling resistor R
7Choose 10m Ω, when flowing through rated current with assurance, sampling resistor can produce the voltage of 100mV.
In the control circuit, that dsp chip adopts is the TMS320F2812 of TI company, and that the CPLD chip adopts is the EPM7128AETC100 of ALTERA company; The voltage detecting circuit schematic diagram is as shown in Figure 5, and operational amplifier LM741 adopts the product of NS company among the figure, and photoelectrical coupler HCPL-3700 adopts the product of Hewlett-Packard Corporation, and the resistance value of peripheral circuit elements device and capacitance are all as shown in the figure among the figure; The current detection circuit schematic diagram is as shown in Figure 6, and what isolated amplifier 788J selected for use among the figure is the product of Hewlett-Packard Corporation, and that amplifier U1A and U1B adopt is the LM393 of NS company, and the resistance value of other peripheral circuit components and parts and capacitance are all as shown in the figure.
The theory diagram of alternating current solid-state power controller soft switch device is as shown in Figure 2 among the present invention.
Among Fig. 2, this device is divided into power circuit and control circuit two large divisions, and power circuit mainly is made up of power switch pipe MOSFET and sampling resistor, realizes switching on and off power supply and load; Control circuit is accomplished the driving and the controlled function of power switch pipe.As can beappreciated from fig. 2, control circuit receives the control signal that host computer sends, and from the current signal CUR and the voltage signal VOL of power circuit sample circuit, carries out analytical calculation simultaneously, sends driving signal of power switching tube QG.
Formation and principle in the face of power circuit and control circuit is elaborated down.
Wherein the schematic diagram of power circuit is as shown in Figure 3.
Among Fig. 3, by MOSFET pipe Q
0And Q
1Differential concatenation forms main switch, capacitor C
0And resistance R
6Series connection is with Q
0And Q
1Drain electrode be connected, promptly be parallel to the main switch two ends, form to absorb protective circuit; Resistance R
4And R
5With the main switch parallel connection, form the major loop bleeder circuit, the ac voltage signal VO1 of loop of power circuit is provided to control circuit; Sampling resistor R
7Be series at power circuit, the current conversion that will flow through power circuit is voltage signal CUR, offers control circuit.
Control circuit in the device is core of the present invention, can finishing device in the driving and the control of power switch pipe, realize soft switching function.
The theory diagram of control circuit is as shown in Figure 4 in the soft switch device.
As can beappreciated from fig. 4, control circuit is made up of several parts such as testing circuit, DSP circuit and CPLD circuit in the device.Wherein testing circuit carries out zero passage detection through the voltage signal VOL to AC power, through the major loop sampling resistor current signal CUR that flows through major loop is carried out zero passage detection, and sends zero cross signal at the electric current and voltage zero crossing to the CPLD circuit respectively; The DSP circuit receives by host computer and opens the shutoff control signal through what the CAN bus was sent, sends the break-make control signal to the CPLD circuit; The electric current and voltage zero cross signal that control signal that the CPLD circuit sends the DSP circuit and testing circuit send carries out logical calculated, sends the soft switching drive signal QG of power tube, realizes that the no-voltage of main circuit power pipe is opened and zero-current switching.
● the DSP circuit
That dsp chip adopts in this device is the TMS320F2812 of TI company, and host computer and DSP communicate through the CAN bus according to the communication protocol of establishment.Host computer need only need CAN message is write in the transmission buffer memory of the CAN card that is contained in host computer when this device sends order.After writing, CAN message will be sent to the CAN reception buffer memory of this device dsp chip automatically through the CAN bus, and will produce the message sink interruption.Detect interrupt signal, the interruption that makes an immediate response of DSP main program is read it and is received the message in buffer memory, and according to the communications protocol between DSP and the host computer, through the I/O mouth switch command is sent to the CPLD circuit.
● testing circuit
Testing circuit is voltage detecting circuit and current detection circuit.Wherein the voltage detecting circuit schematic diagram is as shown in Figure 5.
Among Fig. 5, LM741 constitutes see-saw circuit by operational amplifier, and the ac voltage signal VOL that is taken from major loop is amplified, and the signal after amplifying is delivered to photoelectrical coupler HCPL-3700.
HCPL-3700 is the voltage/current threshold test photoelectrical coupler that FAIRCHILD company produces, and input exchange signal is carried out zero passage detection.When HCPL-3700 detects AC signal, at first through inner diode rectifier circuit, AC signal is carried out full-wave rectification, signal and preset threshold value after the rectification compare, and threshold setting is zero among the present invention.When input exchange signal during greater than zero point, circuit is output as low level; When input signal during less than zero level, just at the zero crossing of AC signal, circuit output is uprised by low, sends a pulse signal, and the width of pulse signal is by the inner stagnant ring decision of HCPL-3700.Can know that by above analysis voltage detecting circuit can send pulse signal VZ00 at the supply voltage zero crossing.HCPL-3700 isolates on circuit input/output signal simultaneously.
Current detection circuit is accomplished to isolate and is amplified and current over-zero detection task, and its circuit theory diagrams are as shown in Figure 6.
As can be seen from the figure, from the voltage signal CUR of major loop sampling resistor through R
38And R
18Being input to VIN+ and the VIN-of 788J after the dividing potential drop, is that the circuit of main devices accomplish to be isolated enlarging function by 788J among the figure.788J is the isolated amplifier with short circuit and overload detection function.The direct compatible A/D converter of its output level has quick short-circuit detecting (3us) function, with the absolute value mode output overloading detection signal of input signal.It is positive and negative 256mV that 788J requires the input voltage maximum, should be limited within the 200mV under the normal condition.Therefore two diode D of parallel connection between the VIN+ of 788J and VIN-
6, D
7, be used for the amplitude of input signal is limited, when preventing that major loop from overload or short trouble taking place, cause this chip to damage because of electric current is excessive.788J isolates amplification to input signal, from VOUT output, output valve 0 and VREF between change, its output gain representative value is VREF/504mV.In this circuit, it is the reference voltage of 3V that the VREF pin connects outside a reference source, so the actual gain of HCPL-788J is about 6.Because VREF is 3V, the output AC signal of 788J is to be superimposed upon on the DC level of 1.5V.
HCPL-788J output VOUT pin is delivered to 2 pins of voltage comparator U1A and 5 pins of U1B with the output signal of isolating amplifier circuit.That U1A and U1B adopt is amplifier LM393.Because the output signal of isolating amplifier circuit is the AC signal that is superimposed upon on the 1.5V DC level, carries out zero crossing and must the 1.5V bias level be cut before relatively.Therefore pass through a reference source among the figure, the comparative level REF1.5 of 1.5V is provided for 6 pins of comparator U1A3 pin and U1B.When the AC signal of zero passage comparison circuit of input during greater than comparative level, U1B output+5V high level; When the AC signal of zero passage comparison circuit of input during less than comparative level, U1A output+5V high level.Capacitor C
18And C
19Detect the output level rising edge of U1A and U1B, this signal transformation is become pulse signal.
Can know that by above analysis current detection circuit can send pulse signal CZ00-1 and CZ00-2 at the zero crossing that flows through main circuit current.
● the CPLD circuit
Voltage zero-crossing signal VZ00 and current zero-crossing signal CZ00-1, CZ00-2 that control signal CMD that the CPLD circuit sends the DSP circuit in this device and testing circuit send carry out logical calculated.Open order when host computer sends, CPLD sends power tube and opens signal at the alternating voltage zero-crossing point; After power tube is opened, turn-off order when host computer sends, CPLD sends cut-off signals at the alternating current zero crossing, realizes that the no-voltage of alternating current solid-state power controller is opened and zero-current switching.
CPLD inside circuit schematic diagram is following:
Among Fig. 7; The circuit initial condition, power tube drive signal QG is a low level, this low level has been blocked and door inst8; Through non-inst26 open with a door inst9; Be the circuit initial condition, current zero-crossing signal CZ00-1 and CZ00-2 can not meet with a response in circuit, and voltage zero-crossing signal VZ00 is effective.Voltage zero-crossing signal VZ00 through or the door inst10 send into d type flip flop inst27; Pass through d type flip flop; At each voltage over zero, the control signal CMD that the CPLD circuit sends the DSP circuit delivers to circuit output signal QG, in case cmd signal transfers high level to by low level; Power drive signal QG is high level at voltage over zero by low upset promptly, realizes that the no-voltage of power tube is open-minded; At this moment; CPLD circuit output signal QG remains high level; This level blocks and door inst9 through non-inst26, and open simultaneously and a door inst8 are after promptly power tube is opened; Voltage zero-crossing signal VZ00 can not meet with a response in circuit, and current zero-crossing signal CZ00-1 and CZ00-2 become effectively.Current zero-crossing signal is equally also sent into d type flip flop; Pass through d type flip flop; At each current zero-crossing point, the CPLD circuit is delivered to circuit output signal QG with control signal CMD, in case cmd signal transfers low level to by high level; Power drive signal QG is low level at current zero-crossing point by the high level upset promptly, realizes the zero-current switching of power tube.
The effect of present embodiment:
Can realize easily and reliably that according to the interchange SSPC of above-mentioned principle design the no-voltage of device opens and the zero-current switching function, carry out effect analysis according to device in the oscillogram that receives after turning on and off order respectively below.
Among Fig. 8, what passage 1 detected is the MOSFET drive signal, and this signal low level is 0V, and high level is 12V; What passage 2 detected is the load voltage of SSPC, can find out that load voltage is effective value 115V, peak value 162V.As can beappreciated from fig. 8; No-voltage is opened circuit and can accurately be detected voltage over zero among the present invention, after opening control signal and sending, opens circuit through zero passage voltage; Constantly accurately send the MOSFET drive signal in the supply voltage zero passage, realized that the no-voltage of power switch is open-minded.
Among Fig. 9, what passage 2 detected is the MOSFET drive signal; What passage 1 detected is the load current of SSPC, and as can be seen from the figure the load current effective value is 5A.As can beappreciated from fig. 9, after the shutoff order was sent, SSPC can't turn-off immediately, but passed through the effect of zero-current switching circuit, accurately sent cut-off signals at load current point, realized zero-current switching.
Can find out from the waveform of Fig. 8, Fig. 9; Because circuit has realized that effectively no-voltage is opened and zero-current switching; Therefore open shutdown moment at SSPC, loop of power circuit can not guarantee the reliability service of switching tube owing to dv/dt, di/dt produce voltage, current spike; Reduced electromagnetic interference simultaneously, effectively improved the reliability of device by di/dt, dv/dt generation.
Claims (1)
1. the soft switch device of an alternating current solid-state power controller; It is characterized in that comprising power circuit and control circuit; Control circuit receives the control signal of input; This control signal is carried out analytical calculation with the current signal CUR and the voltage signal VOL that are obtained by the power circuit sampling, and power output switching tube drive signal QG gives power circuit; Said control circuit comprises testing circuit, DSP circuit and CPLD circuit; Testing circuit carries out zero passage detection to the voltage signal VOL and the current signal CUR of AC power in the loop, sends zero cross signal to the CPLD circuit when any the zero cross signal value occurs in two kinds of signals; What the DSP circuit received upper input opens the shutoff control signal, sends the break-make control signal to the CPLD circuit; The electric current and voltage zero cross signal that control signal that the CPLD circuit sends the DSP circuit and testing circuit send carries out logical calculated, sends the soft switching drive signal QG of power tube then; Described power circuit comprises MOSFET pipe and biasing resistor, two MOSFET pipe Q
0And Q
1Differential concatenation forms main switch, capacitor C
0And resistance R
6Series connection is with Q
0And Q
1Drain electrode be connected, form the absorption protective circuit be parallel to the main switch two ends; Resistance R
4And resistance R
5With the main switch parallel connection, form the major loop bleeder circuit, the ac voltage signal VOl of loop of power circuit is provided to control circuit; Sampling resistor R
7Be series at power circuit, the current conversion that will flow through power circuit is given control circuit for voltage signal CUR; Described testing circuit comprises voltage detecting circuit and current detection circuit; Described voltage detecting circuit constitutes see-saw circuit by operational amplifier LM741; The major loop ac voltage signal VOL that obtains is amplified; Signal after amplifying is delivered to photoelectrical coupler HCPL-3700 and is carried out zero passage detection, sends pulse signal VZ00 at the supply voltage zero crossing; Resistance R
38And resistance R
18Voltage signal CUR on the major loop sampling resistor is carried out being input to after the dividing potential drop VIN+ and the VIN-of HCPL-788J, resistance R
18With amplitude diode D
6, D
7Be parallel between the VIN+ and VIN-of HCPL-788J, the VREF pin connects the reference voltage of 3V, and HCPL-788J isolates the amplification back from VOUT output, through resistance R to input signal
33And resistance R
35Deliver to 2 pins of the voltage comparator U1A that is made up of operational amplifier LM393 and 5 pins of U1B, the comparative level of 1.5V puts on 3 pins of comparator U1A and 6 pins of U1B; Capacitor C
18And resistance R
16Series circuit at the output of U1A, and with ground parallel resistance R
28With diode D
4, capacitor C
19And resistance R
17Series circuit at the output of U1B, and with ground parallel resistance R
29With diode D
5
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| CN2010102169887A CN101882927B (en) | 2010-07-01 | 2010-07-01 | Soft switch device of alternating current solid-state power controller |
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| CN2010102169887A CN101882927B (en) | 2010-07-01 | 2010-07-01 | Soft switch device of alternating current solid-state power controller |
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| CN101882927B true CN101882927B (en) | 2012-07-04 |
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| CN2010102169887A Expired - Fee Related CN101882927B (en) | 2010-07-01 | 2010-07-01 | Soft switch device of alternating current solid-state power controller |
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