CN1692992A - Switch mode gun driver and method - Google Patents
Switch mode gun driver and method Download PDFInfo
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- CN1692992A CN1692992A CN 200510066711 CN200510066711A CN1692992A CN 1692992 A CN1692992 A CN 1692992A CN 200510066711 CN200510066711 CN 200510066711 CN 200510066711 A CN200510066711 A CN 200510066711A CN 1692992 A CN1692992 A CN 1692992A
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Abstract
Driver circuits for a fluid dispenser operable to dispense a fluid onto a substrate. One driver circuit uses high and low voltage busses to provide a quick pull-in current. Flyback current during a transition to a hold current is clamped to the high voltage bus to return energy to the high voltage bus, which is a capacitor. Another driver circuit uses transitional current references to control coil current at the initial pull-in transition and at the transition from pull-in to hold. In the transition from pull-in to hold, the flyback coil current is modulated between a flyback mode and a freewheel mode.
Description
It is the rights and interests of 60/567,264 U.S. Patent application that the application requires in the application number that submit to April in 2004 30, and its full content is comprised and as a reference fully at this.
Technical field
The present invention relates generally to be used to distribute flowable material, wait until on-chip fuid distribution system (fluid dispensing system) such as adhesive, sealant, filler, and the drive circuit that more specifically, relates to the work of the solenoid actuated valve that is used for control distribution rifle (dispensing gun).
Background technology
Having developed fluid distributes rifle to be used for the accurate dispensing applications of placing fluid (for example, adhesive) to mobile substrate (for example, on packing or the woven product) of needs.An example of this distribution system is in U.S. Patent No. 5,812, proposes in 355, and its full content is comprised and as a reference fully at this.This distribution system employing drive circuit is controlled the solenoidal work in the fluid distributor.Stepped current waveform as shown in Figure 9 is used to the work of the distributing valve in the control dispenser.For opening valve, drive circuit will have leading into electric current (pull-in) 80 of quick startup slope 38 and be added to solenoid coil with the fast retractile valve cage and begin to open dispensing orifice at assignment period.Then, progressively be reduced to the maintenance electric current 40 of maintaining valve sleeve at 37 electric currents at open position.Keep electric current less than leading into electric current; And therefore, use less maintenance electric current to reduce during assignment period, in solenoid coil and distributing valve, produce heat.Drive circuit provides solenoidal quick demagnetizationization 42 then, makes that valve cage is quick closedown on the hole in the ending of assignment period.
Though aforesaid gun driver is functional, still can keeps punching and improve its performance.For example, usually, be provided to the electric current of coil from row voltage (line voltage) by power switch.Therefore, going any variation of voltage changes from the output voltage of power circuit and offers the solenoidal electric current of rifle.Therefore, if the amplitude of row voltage raises, armature moves quickening, and dispense adhesive too quickly.Similarly, if the amplitude of row voltage reduces, armature moves slack-off; And than slower ground of expection dispense adhesive.That does not expect arbitrarily produces waste product with adhesive dispense usually to the zone of the substrate of not wishing to receive adhesive.
The maximum operating speed of distributing valve is determined by the voltage amplitude of row voltage.Therefore, the distributing valve that is connected with 240 volts of AC power supplies faster than the work that is connected with 120 volts of AC power supplies.Therefore, need provide to have and do not rely on capable voltage and have drive circuit consistent, high speed operation.
For known gun driver, lead into electric current 80 and keep electric current 40 to keep by the modulator of the hysteresis of operating power switch usually, in solenoid coil, produce sawtooth or pulsating current thus.Between this modulation period of power switch, when switch closure, electric current increment rate in coil is determined by the amplitude of row voltage; And modulated current rises, as Fig. 9 39 shown in.In addition, when power switch is closed, the speed decay of electric current to determine by coil inductance and coil circuit impedance, as Fig. 9 41 shown in.Therefore, the frequency of the modulation of hysteresis is determined by electric current flow behavior in the solenoid coil and row voltage and is limited.And, may wish to use higher capable voltage to increase the operating rate of distributing valve, this higher capable voltage produces the current over pulse (overshoot) that increases during the current-modulation cycle, be increased in the heat in the coil thus, and the heat in the distributing valve.Like this, further need provide the operating rate that maximizes distributing valve to minimize the gun driver of the heat that adds coil to simultaneously.
Should approve, be for illustrative purposes as Fig. 9 and other waveform shown in the drawings here.Actual waveform seem may with as the shown in the drawings idealized waveform here have a lot of differently, this depends on multiple factor, includes, but are not limited to the requirement of the inductance of coil and resistance, distribution figure, heat consideration, parasitic capacitance etc.
For known gun driver, when electric current from leading into current transition when keeping electric current, as Fig. 2 168 shown in, decay with the speed of determining by coil inductance and solenoid coil circuitous resistance from the electric current coil that the reverse EMF in the magnetic field of collapse (collapsing) creates.The switching rate of this current attenuation is slow relatively, so electric current dissipates in the coil circuitous resistance as heat.Therefore, also need to be provided at, more effectively use the gun driver of the electric current in the coil that the collapse by the magnetic field in the coil produces from leading current transition to keeping during the electric current and remove from coil under the situation of power supply.
Also known use gun driver is to operate a plurality of distributing valves.If those distributing valves are connected in series, need operate gun driver better to be controlled at the electric current in the solenoid coil that is connected in series with current control mode.But,, then wish to be added to better control the voltage at the parallel circuit two ends of solenoid coil with voltage mode operation gun driver if those distributing valves are connected in parallel.For known system, voltage mode control needs gun driver to have the design different with the gun driver that is used for Controlled in Current Mode and Based.Therefore, need provide the gun driver that can optionally be used to provide voltage mode control or Controlled in Current Mode and Based.
Therefore, need provide the gun driver that can solve above-mentioned needs.
Summary of the invention
The invention provides and be used for the gun driver that fluid distributes rifle, its can be independent of the change of capable voltage and stablize, the high-quality fluid allocation process of making peace.In addition, gun driver of the present invention can operate in unanimity, measurable and at a high speed open distributing valve.In addition, by gun driver of the present invention, from leading current transition during keep electric current, the flyback current of storage coil is used for follow-up use and dissipates as heat unlike existing system.Therefore, gun driver of the present invention provides the predictable distribution barotaxis energy of making peace in the wide region of multiple application, and with still less energy loss work and reduce spontaneous heating.By reducing the heat that produces by energy loss, not only increased and distributed the life-span of rifle, and can use higher operating current to increase performance.
In the gun driver of the present invention one can be that serial or parallel connection connects and optionally is used for current control mode or voltage mode control with respect to voltage bus according to a plurality of solenoid coils.When in current control mode, use the low-voltage bus to be used to keep and lead into electric current and keep electric current with the pulsating current of (highlyregulate) that high voltage stability is provided, low amplitude, reduce energy consumption, the heat in distributing valve and electromagnetic radiation thus.When in voltage mode control, be independent of current feedback signal power switch circuit is carried out pulse width modulation.
According to principle of the present invention and according to described embodiment, the invention provides the gun driver circuit of the fluid distributor that is used for to operate in distributing fluids on substrate.Fluid distributor has the solenoid coil that operation of selector valve flows from fluid distributor with the control fluid.Gun driver has first switch between the end that is connected higher voltage bus and solenoid coil and is connected to the second switch of the other end of solenoid coil.Current sensor is connected to second switch, and the 3rd switch is connected between the end of lower voltage bus and solenoid coil.Closed first switch of control circuit to be being added to solenoid coil with the higher voltage bus, and produces electric current in solenoid coil, and then, disconnects first switch in response to the electric current that is substantially equal to lead into the electric current set-point in coil.This control circuit operation second switch is being added to solenoid coil with lower voltage bus, and the electric current that maintains in the coil is substantially equal to lead into the electric current set-point.
In another embodiment of the present invention, gun driver can be operated and can distribute rifle by a plurality of fluids of distributing fluids on substrate.This fluid distributes rifle to have a plurality of distributing valves of a plurality of solenoid coils that are operably connected to respectively separately.Each solenoid coil can operate in feasible a plurality of distributing valves and move opening and closing between the position, is used to control the flowing of fluid of distributing rifle from separately fluid.Gun driver has the power switch circuit that is connected between power bus and at least one solenoid coil, and controller, it is exercisable to be connected to power switch circuit so that power switch circuit provides to be led into electric current to a plurality of solenoid coils, and the maintenance electric current is provided afterwards.Controller has the voltage mode control of using in response to a plurality of solenoid coils that are connected in parallel at the voltage bus two ends, and in response to the Controlled in Current Mode and Based of a plurality of solenoid coils that are connected in series with voltage bus.
In a scheme of the present invention, Controlled in Current Mode and Based has operationally and is connected so that the current sensor of the feedback signal that is illustrated in the electric current in a plurality of solenoid coils to be provided with a plurality of solenoid coils.Comparator with lagged value has first input of the feedback signal of being connected to and provides second of electric current set-point to import.The output of comparator is connected with power switch circuit, and comparator makes power switch circuit at first in response to connecting voltage bus less than the feedback signal of electric current set-point to a plurality of solenoid coils, and secondly in response to greater than the feedback signal off voltage bus of electric current set-point and being connected of a plurality of solenoid coils.
In other scheme of the present invention, voltage mode control has the impulse generator that is operably connected to power switch circuit, this impulse generator makes power switch circuit after leading the duration of electric current, connects continuously and off voltage bus and a plurality of solenoid coil.
In additional embodiments of the present invention, gun driver has voltage bus rectification, not voltage stabilizing and is connected the voltage bus of not voltage stabilizing and first on-off circuit between the solenoid coil.Control circuit is operably connected to the current sensor and first on-off circuit, and comprises and definition ascending current benchmark is provided, leads the waveform generator into the current reference waveform of current reference and follow-up maintenance current reference.This control circuit is operated first on-off circuit and be substantially equal to the ascending current benchmark to produce in solenoid coil, and equals then to lead into current reference, and equals to keep the electric current of current reference then.
In one aspect of the invention, waveform generator further is provided at the drop-out current benchmark that leads between current reference and the maintenance current reference.The second switch circuit is connected to the other end of solenoid coil, and has and be connected flyback current in response to first on-off circuit of the voltage bus that disconnects solenoid coil and not voltage stabilizing and arrive not first state of the voltage bus of voltage stabilizing.This second switch circuit has second state that the electric current of permission in solenoid coil dissipates by the resistance in the circuit that comprises solenoid coil.This control circuit switches the second switch circuit between first state and second state makes the electric current in coil be substantially equal to the drop-out current benchmark.
Those of ordinary skills are by understanding multiple other advantage of the present invention, purpose and feature more easily below in conjunction with the detailed description of accompanying drawing.
Description of drawings
Fig. 1 is that principle according to the present invention can be used for the schematic block diagram that operating fluid distributes the gun driver of rifle;
Fig. 2 is the explanatory view of the current-mode waveform that provides of the gun driver by Fig. 1;
Fig. 3 is the explanatory view of an embodiment of the voltage mode waveform that provides of the gun driver by Fig. 1;
Fig. 4 is the explanatory view of another embodiment of the voltage mode waveform that provides of the gun driver by Fig. 1;
Fig. 5 A and 5B are that principle according to the present invention is used for the schematic block diagram of another embodiment that operating fluid distributes the gun driver of rifle;
Fig. 6 is the explanatory view of current waveform of the coil of the current waveform that provides of the gun driver by Fig. 5 A and 5B and generation;
Fig. 7 is the explanatory view of the current waveform during ascent stage that provides of the gun driver by Fig. 5 A and 5B;
Fig. 8 is the explanatory view of the current waveform during the decline stage that provides of the gun driver by Fig. 5 A and 5B;
Fig. 9 is the explanatory view of the sublevel current waveform that provided by known gun driver.
The specific embodiment
With reference to figure 1, distributing valve 20 has and is set to optionally to be blocked in the valve seat 26 the movably armature or the valve cage 22 of the dispensing orifice 24 that forms.To be extended by the mode of solenoid 27 controls and to shrink, wherein solenoid 27 has solenoid 28 to valve cage 22, is used to provide the repeatably distribution figure of fluid to mobile substrate with respect to valve seat 26.Generally speaking, solenoid surround the magnetic pole (not shown) and to its energy supply producing magnetic field with respect to magnetic pole, thereby towards magnetic pole movement of valve sleeve 22 and open distributing valve 20.In the ending of assignment period, coil 28 is no longer by energy supply, and return spring 30 makes valve cage 22 turn back to initial position, closes distributing valve 20 thus.The coil 28 of solenoid 27 is by gun driver 84 operations that comprise power circuit 86 and controller 92.Power circuit 86 has high voltage source 88, and it provides about 325 volts high-voltage bus 89 at positive terminal.
If the user has selected Controlled in Current Mode and Based, leading into timer 102 in controller 92 by forward position (beginning of its indication fluid dispense operation) starting from the triggering signal 100 of system control 94.By leading the leading duration of work of determining distributing valve 20 into the duration of timer 102 counting into the stage.The positive forward position of triggering signal 100 is provided with the trigger (flip-flop) 124 that the input 118 that height outputs to multiplexer 106 is provided simultaneously.In Controlled in Current Mode and Based, multiplexer 106 will be delivered to door (gate) driver 126 from the height output of trigger 124, make power switch 128 closures of winning.Powered-down switch 128 makes and connects the end of high voltage bus 89 to distributing valve coil 28.Simultaneously, low for the flyback mode signal, multiplexer 130 is delivered to the input 122 of multiplexer 110 with high level, and the input 122 of multiplexer 110 is delivered to high level second gate driver 132 that is used for closed second source switch 134 again successively.When power switch 128 and 134 closures, current path is from high voltage bus, by first power switch 128, distributing valve coil 28 and second source switch 134.
Be provided at the high signal of output on 103 under the situation of current waveform generator 99 leading timer 102, current waveform generator 99 provides and leads the input 140 to the comparator 142 with lagged value into electric current set-point (setpoint) 150.At this moment, the electric current minimum, as Fig. 2 147 shown in; And the current feedback signal in input 144 is less than leading into electric current set-point 150.Like this, the output of comparator 142 is high.This high signal is delivered to the input 120 of multiplexer 108 and is delivered to the gate driver 152 of connecting first power switch 154.
Therefore, lead into electric current for starting in current-mode, the forward position of triggering signal 100 makes and power switch 128,134 and 154 closures thus about 325 volts voltage is added to solenoid coil from high-voltage bus 89.Application in the high voltage bus at coil 28 two ends provides maximum current change rate and very high leading into current conversion speed, as Fig. 2 136 shown in.The high switching rate of leading electric current makes the electric current that flows in coil 28 very fast, predictably and as one man reach leading into current level 138 of needing.Solenoid 27 can movement of valve sleeve 22 speed determine that by the magnetic force that solenoid coil 28 produces it is again to be determined successively by the electric current in the coil.Therefore, coil current reaches leading into value of its needs more soon, and magnetic field can more quickly produce the power that is enough to the movement of valve sleeve; And valve cage can more quickly move to open position.Therefore, use high voltage bus 89 with provide in the solenoid coil electric current fast, one make peace and predictably increase, thereby be convenient to greatly distributing valve 20 fast, one make peace and predictably open.
When the electric current in distributing valve solenoid coil 28 increased, the voltage at current sense resistance 146 two ends also increased.The voltage of this expression feedback current value is provided to the sensing or second input 144 of comparator 142.According to circuit design, amplifier 148 (it has adjustable gain so that the output of electric current convergent-divergent and absolute current value to be provided) is used to provide current feedback signal to comparator 142 alternatively.When leading in coil 28 increases into electric current 136 (Fig. 2), it will arrive greater than the value of leading into electric current set-point 150.In addition, because the transmission delay in the assembly of gun driver 84, lead overshoot to be led into electric current point value be set into electric current 136, as Fig. 2 152 shown in.
When the current feedback in sensing input 144 surpassed an amplitude, this amplitude equaled leading into the set-point in input 140 and adds lagged value, and comparator 142 switches to its output low.That low signal is reversed in the input 158 that resets of trigger 124, changes trigger 124 thus and is output as low state.Trigger 124 rests in remaining assignment period and resets.Low state transfer in the input 118 of multiplexer 106 to gate driver 126, is opened this switch 128 and the connection between high voltage bus 89 and distributing valve coil 28 thus.The low state of comparator 142 also transmits by multiplexer 108, the power switch 154 that makes gate driver 152 open thus to be connected with low-voltage bus 156.Electric current flows through diode 133, coil resistance 76, solenoid coil 28 and feedback resistance 146 now.When energy dissipation of storing in coil 28 and electric current minimizing, the amplitude of the feedback current in sensing input 144 begins to descend.Deduct the amplitude of lagged value when following when it drops to the electric current set-point 150 of leading that equals to import on 140, comparator 142 changes state once more, and the output with it drives to high thus.That high state is by multiplexer 108 and make gate driver 152 closed power switches 154, is thus connected coil 28 to low-voltage bus 156.
Like this, comparator 142 is as hysteresis modulator and establishment common hysteretic levels and the positive switching rate of electric current and sawtooth or the pulsating current amplitude 164 (Fig. 2) that negative delay speed is determined by comparator 140.The use of lower voltage bus 156 causes basically overshoot still less and produces basically modulation current amplitude 164 (Fig. 2) less than the modulation current amplitude 80 (Fig. 9) by using the capable voltage generation in the known gun driver.The lower pulsating current amplitude that the pulsating current of voltage stabilizing has is many more, then makes the heat that produces in the more little and load of RMS electric current few more.By increasing average current level, the less heat of generation provides the longer life-span of distributing valve 20 and/or the performance of increase.Switching rate that reduces and lower pulsation will reduce Electromagnetic Launching.
The end of leading the angle of incidence is by determining from the sequential of leading into the state of the change output 103 of timer 102.In this, current waveform generator 99 reduces the amplitude of the set-point in input 140 to lower maintenance current value 166.In addition, the current feedback voltage in input 144 is higher than maintenance current value 166; And therefore, the output state of comparator 142 is low.This low state makes and disconnects low-voltage bus and coil 28 thus by gate driver 152 disconnecting power switch 154.
In the ending of leading into pattern, gun driver 84 can operate in the freedom (freewheel) or inertia mode (coast mode) that the energy in the coil wherein dissipates by coil circuit, and perhaps wherein the energy in the coil turns back to the flyback pattern of power supply.The free schema of operation is to be selected for low by the state that flyback mode signal 170 is switched in system's control 94.High state in the input 135 of multiplexer 130 is passed to multiplexer 110.In Controlled in Current Mode and Based, the triggering signal high state makes switch 134 remain closed.In the inertia mode of work, from decaying with the speed of determining by the resistance of the forward voltage at inductance, coil resistance 76 and diode 133 two ends of coil 28 that the reverse EMF in collapse magnetic field creates, shown in 168 the dotted line of Fig. 2 at the electric current of coil 28.The switching rate of this current attenuation is low relatively, and energy is dissipated as heat in resistance 76 and diode 133.
In addition, select the flyback pattern of work, enable input 137 what the flyback pattern in the input 170 of enabling was switched to high state and was added to multiplexer 130 by the user or by system control 94.In addition, by from leading the trailing edge reset flip-flop of creating into the sequential of timer 102 141, it is low that it makes that the output of multiplexer 130 and 110 becomes, and further make second gate driver 132 disconnect second source switches 134.By cut-off switch 134, the collapse magnetic field of coil 28 is induced-current therein, and this electric current charges to the capacitor in high-voltage power supply 88 172 effectively through the path by diode 129,133.In this situation, utilize the flyback voltage of clamper to high voltage bus 89, current conversion speed is very fast, as Fig. 2 174 shown in; And by to electric capacity 172 chargings, energy is turned back to high-voltage power supply 88 be used for follow-up use, reduced the energy loss in the distributing valve 20 thus.
In addition, the electric current in coil 28 is very fast drops to value less than the required maintenance current value 175 of Fig. 2.Again, because the propagation delay generation overshoot 176 of the assembly in the gun driver 84.When the current feedback in the sensing of comparator 142 input 144 dropped to the maintenance electric current that equals to import on 140 and point value is set deducts the amplitude of lagged value, relatively 142 switched its high state that outputs to once more.This edge transition is provided with trigger 141 and is output as height, makes gate driver 132 Closing Switch 134 once more thus.The high state of the output of comparator 142 is delivered to gate driver 152 by multiplexed 108, thereby Closing Switch 154 also is added to distributing valve coil 28 with low-voltage bus 156 once more.Comparator 142 is operating as the hysteresis modulator once more and continues Switching power switch 154 and switches on and off so that sawtooth or pulsating current 178 to be provided during remaining maintenance current phase.About leading into the described mode of current phase, pulsating current 178 more by a small margin provided the advantage that heat reduces, Electromagnetic Launching reduces and the life-span of distributing valve increases with before.
The ending of assignment period is determined by the edge of delaying of triggering signal 100.When triggering signal changed state, this edge conversion was transmitted by AND door 149,157,143, drives them and is output as low.This low state makes each power switch 128,154,134 disconnect, and disconnects the high and low voltage bus 89,156 with coil 28 thus.Along with power switch 134 disconnects, with flyback voltage through diode 129,133 clampers to high voltage bus 89; And by capacitor 172 chargings to high-voltage power supply 88, the most of dump energies in coil 28 dissipate fast, shown in 190.And the energy that turns back to power supply 88 is not converted into heat.By reducing the energy loss in distributing valve, its life-span increases; And heat reduces permission and increases operating current with its performance of further improvement.
As the selection of Controlled in Current Mode and Based, the user can select with voltage mode control 96 operation gun drivers 84, and voltage mode control 96 is used when the solenoid coil of each distributing valve 20 is connected in parallel usually.Have two mode of operations for voltage mode control 96, in other words, do not use first mode of operation of high voltage bus and second mode of operation of use high voltage bus.Below the voltage mode control that does not use high voltage bus 89 will be described at first.System's control 94 at first switches to height with the state of voltage mode control signal 104, makes multiplexer 106,108,110 that the state transfer of their inputs 112,114,116 is separately arrived their output separately thus.
The forward position of triggering signal 100 is started effectively and is led into timer 102, switches it thus and is output as height.The high state of triggering signal 100 is delivered to gate driver 132 by multiplexer 110, closed thus power switch 134.Need not the work of high voltage timer, it is low input continuously that AND door 149 has, and opens thereby keep power switch 128.Or (OR) door 151 has and second importing of leading that of being connected into timer output 103 import and be connected with the programmable square wave generator 153 that square-wave waveform 186 is provided.Multiplexer 108 is delivered to gate driver 152 with high signal, thus Closing Switch 154 and low-voltage bus 156 is added to solenoid coil 28.Therefore, the electric current of setting up in solenoid coil 28 is the function of the resistance in coil inductance and the coil circuit, shown in the electric current 188 of Fig. 3.
When leading into 102 times of advent of timer, and its output 103 becomes when low, and the electric current in solenoid coil 28 arrives its peak value, as Fig. 3 191 shown in.Under the situation that the flyback pattern is closed, become when low when leading into pulse 184, if the output of square-wave generator 153 also is low, then the input 104 of multiplexer 108 is low, disconnecting power switch 154 thus.Like this, the electric current of solenoid coil 28 dissipates in foregoing mode in free schema.
After following the end of leading pulse 184, OR door 151 begins to keep pulse 186 to transmit from square-wave generator 153 square wave.Utilize each to keep the forward position of pulse 186, the output of AND door 157 becomes height, makes driver 152 that power switch 154 is switched to connection, thereby reconnects distributing valve coil 28 to low-voltage bus 156, becomes low up to the edge of delaying that keeps pulse.In fact, when the electric current in coil 28 was decayed shown in 192, power switch 154 was by keeping pulse 186 to carry out pulse width modulation.At last, the average current value that the current attenuation in coil 28 provides to the pulse width modulation of being undertaken by the maintenance pulse 186 of power switch 154, as Fig. 3 194 shown in.By increasing respectively or reducing the duty factor that keeps pulse 186, can increase or reduce the average amplitude that keeps electric current 194.
The ending of assignment period is definite by the edge of delaying of triggering signal 100, and as previously mentioned, when triggering signal changes state, AND door 149,157,143 forbiddings power switch 128,154,134 separately.In foregoing mode, along with power switch 134 is opened, flyback voltage through diode 129,133 clampers to high voltage bus 89; And the dissipation electric current turns back to high-voltage power supply 88 and is used for follow-up use in coil 28.
In second embodiment of the voltage mode control of using high voltage bus 89, high voltage timer 145 starts with the forward position of trigger impulse 100 and high voltage pulse 182 is provided.The duration of high voltage pulse 182 can be set to the value that needs arbitrarily, and in the part of the duration of leading pulse 184 or lead on whole duration of pulse and work.With high voltage pulse 182 be input to (AND) door 149, drive it thus and be output as height.This height output makes and thus high voltage bus is added to solenoid coil 28 by gate driver 126 closed power switches 128.Electric current raises fast in solenoid coil 28, as Fig. 4 196 shown in.Determine the performance of the duration of high voltage pulse 182 with maximization distributing valve 20.High voltage pulse 182 is follow-up to be become lowly, makes the output of AND door 149 become low thus.This low state transmits by multiplexer 106, and makes gate driver 126 turn on the power switch 128, disconnects being connected of high voltage bus 89 and solenoid coil 28 thus.It is longer than high voltage pulse 182 on the duration to lead pulse 184, and its high state keeps the output of OR door 151 to be continuously height, keeps power switch 154 closures and low-voltage bus thus and continues to be connected to solenoid coil 28.Therefore, the electric current in the solenoid coil 28 continue as Fig. 4 198 shown in up to leading into timer 102 expirations.In this, the electric current in the coil is at its peak value, as Fig. 4 191 shown in.Should be appreciated that, use high voltage pulse, lead into electric current and compare the value of not using high voltage pulse will arrive its needs faster, and therefore, lead into the duration of pulse shorter when using high voltage pulse.Afterwards, the work of this embodiment of voltage mode control is described identical about first embodiment of Controlled in Current Mode and Based with the front.
Therefore, gun driver 84 gun driver compared to existing technology has lot of advantages.For example, gun driver 84 provides to work as and is used to provide Current Control or voltage-controlled single unit when using a plurality of distributing valve.And, when using Current Control or Control of Voltage,, come closed distributing valve 20 by using the high voltage of the normally used capable voltage of gun driver that is higher than prior art basically.Therefore regulating high voltage makes and provides one to make peace fast current conversion speed to make valve open immediately.
In addition, when using Controlled in Current Mode and Based,, can use the flyback pattern from leading into current transition when keeping electric current, wherein with the flyback voltage clamper to high voltage bus; And the electric current of self-reversal EMF is to electric capacity 172 chargings in the future.Therefore, storing this electric current is used for follow-up use and dissipates as heat unlike existing system.Electric current in coil reduces to the value that it needs fast and as one man.Similarly, do not consider control model, in the ending of assignment period, with the flyback voltage clamper to high voltage bus; And the electric current that uses self-reversal EMF is used to electric capacity 172 chargings.
In current control mode, be added to coil 28 by hysteresis modulation with the low amplitude pulsating current of low-voltage bus 156 through the height voltage stabilizing is provided, keep lead into and keep electric current.Compare existing capable voltage modulated system, the energy efficiency of low-voltage bus is higher and provide better electric current to regulate.
Second embodiment of switch mode gun driver is shown in Fig. 5 A and 5B.With reference to the timer part of the drive circuit of figure 5A, receive in input 200,202 and to start operator's order that fluids share out the work and the isolator 204 by optionally coupling transmits.Operational order is provided and is used to reset at the timer 2 08 that output 210 provides clock signal in output 206.This work order further triggers the switch 212 of enabling inclination generator 214.Comparator 216,218 and 220 and their XOR (exclusive OR) door 222,224,226 and linear switches 228,230,232 separately in output 236, provide reference current waveshape 234, as shown in Figure 6, it duplicates the desirable rifle electric current with respect to time section (profile).Current waveform 234 first or lead into the stage by three time sequential pulse T1, T2, T3 typing, it is determined ascending current benchmark 229 respectively, leads into current reference 231 and the 233 relative duration that keep current references 235 of drop-out current benchmark.
The drive part of switch mode gun driver is shown in Fig. 5 B and have an input 238,240 of the capable power supply that is connected to not voltage stabilizing.Jumper 242 is installed, and diode 244,246,248,280 is as voltage multiplie when input 238,240 is connected to 120 volts of voltage AC.When being connected to 240 volts of AC, input 238,240 and 240 removes jumper 244.When removing jumper 242, diode 244,246,248,250 connects with the bridge rectifier structure.On bus 254, provide approximately+330 volts voltage, and on bus 256, provide approximately+10 volts voltage.Circuit 257 provides the voltage that is higher than voltage bus 254, and this voltage bus 254 is given the gate drive circuit power supply of high-side switch 258, and the voltage on bus 256 is given the gate drive circuit power supply of low side switch 260.Voltage bus 256 is returned the Voltagre regulator power supply that positive electricity line ball (rail) 263 is provided, and charge pump 264 provides corresponding negative pressure-wire 266.
The Q that clock pulses on online 272 is removed trigger 274 and driven it is output as low, makes high-side switch 258 closures, thereby voltage bus 254 is added to solenoid coil 280,282 in the fluid distributor.Should be output as lowly at the Q that input clock pulses on 272 is also removed trigger 292 and driven it, it makes low side switch 260 close.The electric current that flows through coil 280,282 has by the path of low side switch 260 and by 284 monitoring of current sense resistance.Comparator 286 is relatively from the voltage of current sense resistance and the current waveform 234 that receives in input 270.When feedback voltage surpassed benchmark in input 270, default trigger 274 was opened high-side switch 258 and thus from coil 280,282 voltage take-off buses.The electric current that is caused by the reverse EMF of coil 280,282 is by diode 288 flybacks.Current feedback voltage makes comparator 286 slave flipflops 274 remove this thus and presets now less than the current waveform that increases.
This process wherein shows the waveform 281 of the electric current in the coil during the rising part T1 of current waveform 234 as shown in Figure 7.Trigger 274 is removed to provide closed high-side switch 258 voltage bus 234 is added to the output of coil 280,282 in an edge in the clock pulses 279 in input 272, is increased in the typically moving electric current of the coil midstream shown in 283 thus.When the current feedback from sensing resistor 284 surpassed the ascending current benchmark, default trigger 274 was opened high-side switch 258 thus.Electric current in coil 280,282 free (freewheel downward) downwards is typically shown in 285.If when clock pulses is added to trigger 274, feedback voltage still surpasses ascending current benchmark 270, and trigger 274 maintains its preset state.
This apply and from the process of coil 280,282 voltage take-off buses 234 at ascending current benchmark time sequential pulse T1 and lead duration of current reference time sequential pulse T2 and continue, just, rise and lead the stage during continue.During time sequential pulse T1, the ascending current reference waveform 229 on online 270 continues to increase up to arriving required leading into current amplitude.In this, start time sequential pulse T2, and leading in input 270 kept into current reference waveform 230 and to be equaled required amplitude of leading into the unanimity of electric current.In the ending of leading into the stage, time sequential pulse T3 starts wherein the drop-out current reference waveform in input 270 to be reduced to the decline stage that keeps the current reference amplitude.
It is default that time sequential pulse T3 in input 290 keeps trigger 274, and therefore, keep high-side switch 258 to disconnect.In addition, the clock pulses driving Q in input 272 is output as low, and itself and the time sequential pulse T3 in input 291 are in conjunction with providing output to make low side switch 260 disconnect.When decline current reference waveform 233 is reduced to when keeping current reference value 235, from the flyback current of coil 280,282 by the current sense resistance 298 of feedback voltage to comparator 300 is provided.Flyback current also flows through diode 288,289, thus inductive energy is turned back to power capacitor 294,296.When coil current descended fast, shown in 295 typical cases of Fig. 8, current sense resistance 298 continued to provide current feedback to arrive comparator 300.In the time of under current feedback drops to the drop-out current benchmark of importing on 302 233, comparator 300 change states and default trigger 292, closed thus low side switch 260.Electric current is switched to free schema through diode 288, reduces current attenuation speed thus, as Fig. 7 297 shown in.When the rate of decay of electric current reduced, current feedback surpassed the drop-out current benchmark 233 in input 302, thereby the state and the slave flipflop 292 that change comparator 300 are removed default.Next clock pulses in input 272 is removed trigger 292, causes that again low side switch 260 disconnects, and provides feedback current to power capacitor 294,296 thus once more.By this cycle, thereby being carried out pulse width modulation, low side switch 260 reduces electric current with quick still controllable mode, to meet drop-out current reference waveform 233, turn back to power supply up to the remanent induction energy of on coil 280,282, storing.In the ending of time sequential pulse T3, low side switch is kept closure once more, and high-side switch is with keeping 235 work of current reference waveform, keeping electric current by coil, as Fig. 6 287 shown in.
By this switch mode gun driver, monitor instantaneous rifle electric current, and with the current waveform 234 that reappears desirable electric current and the curve of the ratio of time relatively.Based on this relatively, the duty factor of the pulse-width modulator of being realized by trigger 292 is changed the current error that is caused by the change of row voltage, power-supply fluctuation, rifle inductance and rifle resistance to revise.Like this, the time average voltage that is added to rifle is controlled by the pulse width modulation of the voltage of voltage stabilizing not.As shown in Figure 6, the electric current that is used for providing coil 280,282 to flow is provided the switch mode gun driver of Fig. 5 A and 5B, as Fig. 6 299 shown in, it is roughly near current waveform 234.
The switch mode gun driver of Fig. 5 A and 5B has the advantage of being powered by capable voltage rectification, not voltage stabilizing, its improvement power-efficient, minimizing spontaneous heating, improvement stability, permission are packed more closely, and rifle activation repeatedly (and therefore, providing more repeatably, valve opens and closes the time) also can be provided.In addition, use the rifle winding to reduce the needs of the magnetic assembly of customization as the inductive energy memory element, this has reduced manufacturing and cost of inventory.
Though the description by various embodiments shows the present invention, and describes in detail these embodiment, it is not will limit or limit in any other mode the scope of appended claim again to these details.Additional advantage in the spirit and scope of the present invention and modification are to those skilled in the art clearly.For example, with reference to figure 1, controller 92 is described to have operator's input to select voltage or current control mode or inertia or flyback (flyback) pattern.Should think that in other embodiments, the selection of these patterns is that the supplier by controller 92 determines, and unavailable for the user.In described embodiment, in current control mode and voltage mode control, the forward position of triggering signal 100 makes high voltage bus 89 and low-voltage bus 156 be added to solenoid coil 28.To approve as us, in the embodiment that replaces, the application that can postpone low-voltage bus 156 up to high voltage bus 89 from time that coil 28 removes.
Be implemented in gun driver described here with Digital Logic.But, should be appreciated that, in the embodiment that replaces, can use simulated assembly to realize the multiple function of gun driver.Should approve, can and distribute the figure and the needs in cycle to adjust the value of voltage bus amplitude according to the characteristic of specific distribution rifle and solenoid coil and performance.In addition, should be appreciated that the feature of described gun driver can be applied to the gentle distribution rifle of starting building to do of electricity distribution rifle here.
Therefore, the present invention is shown in it is not limited in the scheme the most widely and described specific detail.Therefore, the spirit and scope that can not break away from following claim are made modification to described details here.
Claims (30)
1. gun driver, it is used for the operationally fluid distributor of distributing fluids on substrate, this fluid distributor has the distributing valve that is operably connected to solenoid coil, this solenoid coil operationally makes distributing valve be used to control fluid from mobile between the opening and closing position of flowing of fluid distributor, and this gun driver comprises:
The higher voltage bus;
First switch, it has a side that is electrically connected to the higher voltage bus and is suitable for being connected to second side of an end of solenoid coil;
Second switch, it has a side of the opposite end that is suitable for being electrically connected to solenoid coil;
Current sensor, it is used for responding to the electric current at solenoid coil;
Lower voltage bus;
The 3rd switch, it has the side that is electrically connected to lower voltage bus and is suitable for second side that the end electricity with solenoid coil joins; And
Control circuit, it is operably connected to first switch, second switch and the 3rd switch, this control circuit:
Provide and lead into the electric current set-point;
Closed first switch is to be added to the higher voltage bus solenoid coil and to produce electric current in solenoid coil;
Disconnect first switch in response to the electric current that in coil, is substantially equal to lead into the electric current set-point, and
The operation second switch is being added to solenoid coil with lower voltage bus, and the electric current that maintains in the coil is substantially equal to lead into the electric current set-point.
2. gun driver as claimed in claim 1, wherein, this control circuit arrives solenoid coil with closed first switch while closed second switch to be connected high voltage bus and low-voltage bus basically.
3. gun driver as claimed in claim 1, wherein, this high voltage bus comprises capacitor.
4. gun driver as claimed in claim 1 further comprises:
First diode, the anode that it comprises the negative electrode that is connected to the higher voltage bus and is connected to the other end of solenoid coil; And
Second diode, the anode that it comprises the negative electrode of the opposite end that is connected to solenoid coil and is connected to second side of second switch.
5. gun driver as claimed in claim 1, wherein, this higher voltage bus provides the voltage that is higher than available rows voltage, and this lower voltage bus provides the voltage that is lower than available rows voltage.
6. gun driver as claimed in claim 1 further comprises the 3rd diode, and it comprises negative electrode that is connected to the 3rd switch one side and the anode that is connected to lower voltage bus.
7. gun driver, it is used for operationally a plurality of fluids distribution rifles of distributing fluids on substrate, this fluid distributes rifle to have a plurality of distributing valves that are operably connected to a plurality of solenoid coils respectively, each of this solenoid coil operationally makes each distributing valve be used to control fluid from mobile between the opening and closing position of flowing of each fluid distribution rifle, and this gun driver comprises:
Voltage bus;
Power switch circuit, at least one second side that it has first side that is connected to voltage bus and is suitable for being electrically connected to a plurality of solenoid coils; And
Controller, it is operably connected to power switch circuit and arrives a plurality of solenoid coils so that power switch circuit provides to lead into electric current, and the maintenance electric current is provided then, and this controller comprises:
Voltage mode control, this voltage mode control response is used in a plurality of solenoid coils that are connected in parallel at the power bus two ends, and
The solenoid coil that Controlled in Current Mode and Based, this Controlled in Current Mode and Based are connected in series in response to a plurality of and voltage bus and being used.
8. gun driver as claimed in claim 7 further comprises and leading into the electric current timer, and it provides the signal of representing to lead into the duration of electric current.
9. gun driver as claimed in claim 8, wherein, this Controlled in Current Mode and Based comprises:
Current sensor, it operatively is connected the feedback signal that is illustrated in the electric current in a plurality of solenoid coils to provide with a plurality of solenoid coils; And
Comparator, it has lagged value, and this comparator comprises:
First input, it connects feedback signal,
Second input, it provides the electric current set-point, and
Output, it connects power switch circuit, this comparator makes this power switch circuit at first connect voltage bus to a plurality of solenoid coils in response to the feedback signal less than the electric current set-point, and then in response to coming being connected of off voltage bus and a plurality of solenoid coils greater than the feedback signal of electric current set-point.
10. gun driver as claimed in claim 9, wherein, this Controlled in Current Mode and Based further produces leads into electric current set-point and maintenance electric current set-point, this leads into the electric current set-point and is used in the duration of leading into electric current by comparator, and this maintenance electric current set-point is used after leading into the duration of electric current by comparator.
11. gun driver as claimed in claim 8, wherein, this voltage mode control provides the voltage mode signal, and this voltage mode control makes on-off circuit in the duration of leading into electric current voltage bus is added to a plurality of solenoid coils.
12. gun driver as claimed in claim 11, wherein, this voltage mode control further comprises impulse generator, it is operatively coupled to power switch circuit, this impulse generator makes power switch circuit after leading the duration of electric current, connects continuously and off voltage bus and a plurality of solenoid coil.
13. a fluid distributes rifle, it is used for distributing fluids on substrate, and it comprises:
Distributing valve, it can move between the mobile opening and closing position that is used to control the fluid that distributes rifle from described fluid;
Solenoid coil, it has first end and second end, and operationally makes distributing valve move between the opening and closing position;
The higher voltage source, it comprises:
The first terminal, its provide the higher voltage bus and
Second terminal;
First switch, it is connected electrically between first end of the first terminal in higher voltage source and solenoid coil;
Lower voltage source, it comprises:
The first terminal, its provide lower voltage bus and
Second terminal, this second terminal have with the public of second terminal in higher voltage source and are connected;
Second switch, it is connected electrically between first end of lower voltage source and solenoid coil;
The 3rd switch, it is connected electrically between second end of second end of solenoid coil and lower voltage source; And
Controller, it provides first, second and the 3rd output signal to be used for operating respectively first, second and the 3rd switch, and this control circuit further provides staircase waveform, and this staircase waveform comprises starting led into the stage, be the less maintenance stage afterwards, this control circuit provides:
First, second and the 3rd output signal are with closed first switch, second switch and the 3rd switch during the initial part in the stage of leading, and first end of electrical connection solenoid coil and higher voltage bus and lower voltage bus, and
Provide the second and the 3rd output signal with closed second switch in the remaining time in the stage of leading and the 3rd switch afterwards, and be electrically connected first end of solenoid coil and lower voltage bus.
14. gun driver circuit, it is used for the operationally fluid distributor of distributing fluids on substrate, this fluid distributor has the distributing valve that is operably connected to solenoid coil, this solenoid coil operationally makes distributing valve move between the opening and closing position of flowing that is used to control from the fluid of fluid distributor, and this gun driver comprises:
Rectification, the voltage bus of voltage stabilizing not;
First on-off circuit, it has a side of the voltage bus that is electrically connected to not voltage stabilizing and is suitable for being connected to second side of an end of solenoid coil;
Current sensor, it is used for responding to the electric current at solenoid coil; And
Control circuit, it is operatively coupled to the current sensor and first on-off circuit, and this control circuit comprises:
Waveform generator, it provides definition ascending current benchmark, lead the current reference waveform into current reference and follow-up maintenance current reference, this control circuit is operated first on-off circuit and at first equal the ascending current benchmark basically to produce in solenoid coil, and equal then to lead, and equal to keep the electric current of current reference then into current reference.
15. gun driver circuit as claimed in claim 14, wherein, this waveform generator further is provided at the drop-out current benchmark that leads between current reference and the maintenance current reference, and this control circuit further comprises the second switch circuit of the opposite end that is connected to solenoid coil, and this second switch circuit has:
First state, it is connected flyback current and arrives the not voltage bus of voltage stabilizing in response to first on-off circuit disconnects the voltage bus of solenoid coil and not voltage stabilizing, and
Second state, it allows the electric current in solenoid coil to dissipate by the resistance in the circuit that comprises solenoid coil; And
This control circuit switches the second switch circuit between first state and second state makes the electric current in coil be substantially equal to the drop-out current benchmark.
16. gun driver circuit, it is used for the operationally fluid distributor of distributing fluids on substrate, this fluid distributor has the distributing valve that is operably connected to solenoid coil, this solenoid coil operationally makes distributing valve move between the opening and closing position of flowing that is used to control from the fluid of fluid distributor, and this gun driver comprises:
Rectification, the voltage bus of voltage stabilizing not;
First on-off circuit, it has a side of the voltage bus that is electrically connected to not voltage stabilizing and is suitable for being connected to second side of an end of solenoid coil;
Current sensor, it is used for responding to the electric current at solenoid coil;
Control circuit, it is operatively coupled to the current sensor and first on-off circuit, and this control circuit comprises:
Waveform generator, it provides definition ascending current benchmark, lead the current reference waveform into current reference and follow-up maintenance current reference, and this control circuit is operated first on-off circuit to produce the electric current that is substantially equal to the current reference waveform in solenoid coil; And
The second switch circuit, it is connected to the opposite end of solenoid coil, and this second switch circuit has:
First state, it is connected flyback current and arrives the not voltage bus of voltage stabilizing in response to first on-off circuit disconnects the voltage bus of solenoid coil and not voltage stabilizing, and
Second state, it allows the electric current in solenoid coil to dissipate by the resistance in the circuit that comprises solenoid coil, and this control circuit switches the second switch circuit between first state and second state makes the electric current in coil be substantially equal to the drop-out current benchmark.
17. method that operates in the fluid distribution rifle of distributing fluids on the substrate, this fluid distributes rifle to have the distributing valve that is operatively coupled to solenoid coil, this solenoid coil operationally makes distributing valve move between the opening and closing position of flowing that is used to control from the fluid of fluid distributor, and this method comprises:
Provide and lead into the duration in stage, lead into electric current set-point and less maintenance electric current set-point;
Higher voltage bus and lower voltage bus are provided;
Into the initial part of duration in stage the higher voltage bus is added to solenoid coil and leads into electric current with quick startup and pass through solenoid coil leading;
Remove the higher voltage bus in response to the electric current that in solenoid coil, is substantially equal to lead from solenoid coil into current reference; And
Will lower voltage bus being added to solenoid coil is substantially equal to lead into current reference with the electric current that maintains in the solenoid coil.
18. method as claimed in claim 17, further comprise the lower voltage bus of modulation to the application of solenoid coil so that the pulsating current that is substantially equal to lead into current reference to be provided.
19. method as claimed in claim 17 is added to solenoid coil with lower voltage bus during further being included in the initial part in the stage of leading.
20. method as claimed in claim 17 further is included in the ending of leading into the duration in stage and removes lower voltage bus from solenoid coil.
21. method as claimed in claim 20 further comprises, in response to removing lower voltage bus from solenoid coil, and will be from the flyback current clamper of solenoid coil to the higher voltage bus.
22. method as claimed in claim 17 further comprises with utilization and removes the capacitor that flyback current charging that lower voltage obtains provides the higher voltage bus.
23. method as claimed in claim 17 comprises that further the lower voltage bus of modulation is substantially equal to keep current reference so that pulsating current to be provided with the electric current that maintains in the solenoid coil to the application of solenoid coil.
24. an operation is used for the method for the fluid distribution rifle of distributing fluids on substrate, these a plurality of fluids distribute rifle to have a plurality of distributing valves that are operatively coupled to a plurality of solenoid coils respectively, each of this solenoid coil operationally makes each distributing valve move between the opening and closing position of flowing that is used to control from the fluid of each fluid distributor, and this method comprises:
Voltage bus is provided;
Produce the timing signal of representing to lead into the duration of current phase;
Produce the voltage mode signal, this voltage mode is connected in parallel at the power bus two ends in response to a plurality of solenoid coils and is used,
Produce the Controlled in Current Mode and Based signal, this Controlled in Current Mode and Based is connected in series in response to a plurality of solenoid coils and voltage bus and is used; And
Be connected power switch circuit between voltage bus and a plurality of solenoid coil in response to timing signal, voltage mode control signal and Controlled in Current Mode and Based signal operation.
25. method as claimed in claim 24 further comprises:
Produce the feedback signal that is illustrated in the electric current in a plurality of solenoid coils in response to the current-mode signal;
Produce the electric current set-point;
Compare lagged value and feedback signal and electric current set-point;
Make power switch circuit connect voltage bus in response to feedback signal to a plurality of solenoid coils less than the electric current set-point; And
Make power switch circuit off voltage bus and a plurality of solenoid coil in response to feedback signal greater than the electric current set-point.
26. method as claimed in claim 24 further comprises:
Make power switch circuit voltage bus is added to a plurality of solenoid coils leading in the duration of current phase in response to the voltage mode control signal;
Detection is substantially equal to lead the electric current into the electric current set-point in of a plurality of solenoid coils;
Produce a series of pulses then; And
With this series of pulses operating power on-off circuit to connect continuously and off voltage bus and a plurality of solenoid coil.
27. an operation is used for the method for the fluid distribution rifle of distributing fluids on substrate, this this fluid distributes rifle to have the distributing valve that is operatively coupled to solenoid coil, this solenoid coil operationally makes distributing valve move between the opening and closing position of flowing that is used to control from the fluid of fluid distributor, and this method comprises:
From row voltage provide rectification, the voltage bus of voltage stabilizing not;
On-off circuit between one end of the voltage bus that is connected not voltage stabilizing and solenoid coil is provided;
Produce the current reference waveform of expression electric current to time relation, it defines ascending current benchmark, leads into current reference and follow-up maintenance current reference; And
Operation switching circuit is to produce the electric current that is substantially equal to the current reference waveform in solenoid coil.
28. method as claimed in claim 27 further comprises:
Generation is illustrated in the current feedback signal of the electric current in the solenoid coil; And
In response to current reference waveform and current feedback signal operation switching circuit.
29. method as claimed in claim 27 further comprises:
Generation is included in the current reference waveform that leads current reference and keep the drop-out current benchmark between the current reference;
The second switch that is connected with the opposite end of solenoid coil circuit is provided, and this second switch circuit has:
First state, it is connected flyback current and arrives the not voltage bus of voltage stabilizing in response to first on-off circuit disconnects the voltage bus of solenoid coil and not voltage stabilizing, and
Second state, it allows the electric current in solenoid coil to dissipate by the resistance in the circuit that comprises solenoid coil; And
Switching the second switch circuit between first state and second state makes the electric current in coil be substantially equal to the drop-out current benchmark.
30. an operation is used for the method for the fluid distribution rifle of distributing fluids on substrate, this this fluid distributes rifle to have the distributing valve that is operatively coupled to solenoid coil, this solenoid coil operationally makes distributing valve move between the opening and closing position of flowing that is used to control from the fluid of fluid distributor, and this method comprises:
From row voltage provide rectification, the voltage bus of voltage stabilizing not;
The voltage bus that is connected not voltage stabilizing and first on-off circuit between the solenoid coil are provided;
Produce the current reference waveform of expression electric current to time relation, its definition is led into current reference, drop-out current benchmark and follow-up maintenance electric current; And
Operate first on-off circuit and follow the electric current that leads into current reference basically in solenoid coil, to produce;
The second switch that is connected with the opposite end of solenoid coil circuit is provided, and this second switch circuit has:
First state, it is connected flyback current and arrives the not voltage bus of voltage stabilizing in response to first on-off circuit disconnects the voltage bus of solenoid coil and not voltage stabilizing, and
Second state, it allows the electric current in solenoid coil to dissipate by the resistance in the circuit that comprises solenoid coil; And
Switching the second switch circuit between first state and second state makes the electric current in coil be substantially equal to the drop-out current benchmark.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US56726404P | 2004-04-30 | 2004-04-30 | |
| US60/567,264 | 2004-04-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1692992A true CN1692992A (en) | 2005-11-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510066711 Pending CN1692992A (en) | 2004-04-30 | 2005-04-30 | Switch mode gun driver and method |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2005347738A (en) |
| CN (1) | CN1692992A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103971997A (en) * | 2013-02-01 | 2014-08-06 | 通用电气公司 | Electrical Operator For Circuit Breaker And Method Thereof |
| CN104034518A (en) * | 2013-03-06 | 2014-09-10 | 哈米尔顿森德斯特兰德公司 | In Situ Flap And Slat Wing Tip Brake Response Tester |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6317994B2 (en) * | 2014-05-08 | 2018-04-25 | 日立オートモティブシステムズ株式会社 | Inductive load drive circuit |
-
2005
- 2005-04-28 JP JP2005131609A patent/JP2005347738A/en not_active Withdrawn
- 2005-04-30 CN CN 200510066711 patent/CN1692992A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103971997A (en) * | 2013-02-01 | 2014-08-06 | 通用电气公司 | Electrical Operator For Circuit Breaker And Method Thereof |
| CN103971997B (en) * | 2013-02-01 | 2018-03-30 | 通用电气公司 | Electric power operation device and its method for breaker |
| CN104034518A (en) * | 2013-03-06 | 2014-09-10 | 哈米尔顿森德斯特兰德公司 | In Situ Flap And Slat Wing Tip Brake Response Tester |
| CN104034518B (en) * | 2013-03-06 | 2017-11-17 | 哈米尔顿森德斯特兰德公司 | Wing flap in situ and slat wingtip brake response test instrument |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2005347738A (en) | 2005-12-15 |
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