CN109958815B - Electromagnetic driver with electromagnetic plunger motion detection circuit - Google Patents
Electromagnetic driver with electromagnetic plunger motion detection circuit Download PDFInfo
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- CN109958815B CN109958815B CN201711400037.3A CN201711400037A CN109958815B CN 109958815 B CN109958815 B CN 109958815B CN 201711400037 A CN201711400037 A CN 201711400037A CN 109958815 B CN109958815 B CN 109958815B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
- F16K31/0675—Electromagnet aspects, e.g. electric supply therefor
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Abstract
The electromagnetic driver is characterized by comprising the solenoid and the electromagnetic plunger matched with the solenoid, wherein the positive end of the solenoid is connected with a solenoid access voltage end, the negative end of the solenoid is connected with the drain electrode of a first NMOS (N-channel metal oxide semiconductor) tube, the drain electrode of the first NMOS tube is connected with the positive electrode of a first diode, the negative electrode of the first diode is connected with the solenoid access voltage end, the source electrode of the first NMOS tube is grounded through a sensing resistor, the grid electrode of the first NMOS tube is connected with a driving signal end, two ends of the sensing resistor are connected into a low-pass filter in parallel, and the output end of the low-pass filter is connected with the electromagnetic plunger motion detection circuit.
Description
Technical Field
The invention relates to an electromagnetic plunger motion detection technology, in particular to an electromagnetic driver with an electromagnetic plunger motion detection circuit, which detects the plunger motion in a solenoid by inducing the current of the solenoid so as to eliminate the electromagnetic driving fault in time and ensure the normal operation of a solenoid actuator.
Background
The traditional electromagnetic driver adopts a voltage driving mode, and the driving current of the traditional electromagnetic driver changes along with the changes of the internal resistance, the temperature and the supply voltage of the coil. The present inventors have found that such an electromagnetic drive system is relatively poor in reliability because it has no detection mechanism for detecting whether or not the actuator is operated and how the operation is effected by only sending a drive signal. In addition, the same large current is adopted no matter in the driving moment or the maintaining stage. This type of drive current is not controllable and is very inefficient, particularly if the drive needs to be maintained for a long period of time, which can lead to heating of the coil or solenoid. The electromagnetic armature is the core of the movement of the on-off of the contactor and also one of the parts with more operation faults, and the main failure mode is that a coil is burnt out (cannot be attracted), and a contact cannot be attracted in place (the contact resistance is larger after attraction). The inventor believes that it is possible to instantly know whether a solenoid actuator is operating normally if the motion of a plunger in a solenoid is detected by inducing a solenoid current. In addition, if different magnitudes of the starting current and the holding current are realized by PWM duty ratio Modulation (PWM), satisfactory driving effect can be obtained, and it is advantageous to prevent the solenoid or the coil from generating heat and improve efficiency. In view of the above, the present inventors have completed the present invention.
Disclosure of Invention
The present invention is directed to the defects or shortcomings of the prior art, and provides an electromagnetic driver having an electromagnetic plunger movement detection circuit, which detects the movement of a plunger in a solenoid by inducing a solenoid current, so as to eliminate an electromagnetic driving fault in time and ensure the normal operation of a solenoid actuator.
The technical scheme of the invention is as follows:
the utility model provides an electromagnetic driver with electromagnetism plunger motion detection circuitry, its characterized in that, includes solenoid and the electromagnetism plunger rather than the looks adaptation, the solenoid access voltage end is connected to the positive terminal of solenoid, the drain electrode of first NMOS pipe is connected to the negative pole end of solenoid, the positive pole of first diode is connected to the drain electrode of first NMOS pipe, the negative pole of first diode is connected the solenoid access voltage end, the source electrode of first NMOS pipe passes through sensing resistance ground connection, the drive signal end is connected to the grid of first NMOS pipe, sensing resistance's both ends parallel access low pass filter, electromagnetic plunger motion detection circuitry is connected to low pass filter's output.
The electromagnetic plunger motion detection circuit comprises an operational amplifier, a buffer, an adder, an active peak value detector and a comparator, wherein the input end of the operational amplifier is connected with the output end of the low-pass filter to receive and amplify the current of an induction solenoid, the first path of the output end of the operational amplifier is connected with the input end of the buffer, the second path of the output end of the operational amplifier is connected with the input end of the active peak value detector, the output end of the buffer is connected with the input end of the adder, the output end of the adder is connected with the negative input end of the comparator, the output end of the active peak value detector is connected with the positive input end of the comparator, the output end of the comparator outputs an electromagnetic plunger motion detection result signal, and the high value or the low value of the detection result signal corresponds to the normal or fault of the.
The adder is internally provided with or connected with a threshold setting circuit, the threshold is a preset threshold, the preset threshold represents a difference value between peak current and valley current, the peak current corresponds to the initial movement moment of the electromagnetic plunger, and the valley current corresponds to the inflection point moment after the electromagnetic current falls after the initial movement of the electromagnetic plunger.
The driving signal end is connected with an output signal end of the solenoid current controller, the output signal end is connected with an output end of a first amplifier, and an input end of the first amplifier is connected with an output end of the pulse width modulation controller.
The output signal end is connected with a sensing signal end, the sensing signal end is connected with a source electrode of the first NMOS tube, the sensing signal end is connected with a first input end of a second amplifier, and an output end of the second amplifier is connected with a third input end of the pulse width modulation controller.
The sensing signal end is grounded through one path of a grounding end, the other path of the sensing signal end is connected with a maintaining signal end, the first path of the maintaining signal end is grounded through a resistor R6, the second path of the maintaining signal end is connected with the first input end of the multi-path signal selector through a reference signal collector, the third path of the maintaining signal end is connected with a peak signal end, the first path of the peak signal end is grounded through a resistor R5, the second path of the maintaining signal end is connected with the second input end of the multi-path signal selector through the reference signal collector, the third path of the maintaining signal end is connected with a maintaining signal end, the first path of the maintaining signal end is grounded through a capacitor C2, the second path of the maintaining signal end is connected with the forward input end of a third amplifier, the third path of the maintaining signal end is connected with an enabling end, the output end.
The positive input end of the third amplifier is connected with an induction current device through a first switch, the control end of the first switch is connected with the first input end of the pulse width modulation controller, the second input end of the pulse width modulation controller is connected with an oscillator node through an oscillator, the first path of the oscillator node is grounded through a resistor R7, the second path of the oscillator node is respectively connected with the drain electrode of a second NMOS tube and the output signal end through the first node, the source electrode of the second NMOS tube is grounded, and the grid electrode of the second NMOS tube is connected with the first input end of the pulse width modulation controller.
The first path of the enabling end is connected with an oscillator node through a voltage input node, the second path of the enabling end is connected with a resistance node through a resistor R3, the resistance node is grounded through a resistor R4, the resistance node is connected with the voltage input node through a resistor R5, the voltage input node is connected with the cathode of a second voltage stabilizing diode, the anode of the second voltage stabilizing diode is grounded, the resistance node is connected with a third inverting input end of a first gate circuit, and the inverting output end of the first gate circuit is connected with the first input end of the pulse width modulation controller.
The voltage input node is connected to the solenoid access voltage terminal through a capacitor C1 to ground and through a resistor R1, respectively.
The voltage input node is connected with an undervoltage locker through a low-dropout linear voltage regulator, the undervoltage locker is connected with a second input end of the first gate circuit, and a third input end of the first gate circuit is connected with the thermal cut-off device.
And the negative input end of the third amplifier is connected with a reference voltage end.
The second amplifier and the third amplifier are both Schmitt triggers.
The invention has the following technical effects: the invention relates to an electromagnetic driver with an electromagnetic plunger motion detection circuit, and provides a technology for detecting the motion of an electromagnetic plunger in a solenoid by inducing the current of the solenoid. The electromagnetic excitation current has a significant tilt angle when energized due to the back emf generated by the electromagnetic plunger motion. The solenoid current dip remains constant regardless of temperature due to the back emf. The technology detects the movement of the plunger in the electromagnetic valve by utilizing the characteristics of electromagnetic current, and can be used for determining the detection threshold of the movement of the electromagnetic plunger by measuring the absolute difference of the current inclination angle. The detection logic senses the solenoid current, which will be interpreted as the end of the solenoid plunger movement when the current falls below a predefined threshold. The technique was validated at different temperatures.
In addition, the invention also provides the technical concept of controlling the current of the solenoid, and preferably realizes the control of the driving current of the electromagnetic driver by the PWM duty ratio adjustment, namely realizes different starting currents and holding currents, and can obtain satisfactory driving effect, be favorable for preventing the solenoid or the coil from generating heat and improve the efficiency. PWM current controllers, i.e. pulse width modulation controllers, aim to regulate the current by a well controlled waveform, thereby reducing power losses. The solenoid current ramps up rapidly to ensure proper opening of the valve or relay, the solenoid current will remain peaked after the current initially rises to ensure proper operation, and thereafter the current drops to a lower hold level to avoid overheating problems and reduce power loss. The peak current duration can be set by using an external capacitor. The peak and hold levels of the current ramp and the PWM frequency can be set separately using external resistors. Even without the use of an external set resistor if the default values of the respective parameters are suitable for the application. The driver device has an internal zener diode that limits the input voltage of the power supply to 15V in applications requiring a higher supply voltage. The driver allows power supply from 120V and 230V ac power sources via rectifiers and current limiting resistors by means of internal zener diodes, and also regulates high dc voltages, for example 48V, in this way. The invention has the following characteristics: 1. the power supply is suitable for high-voltage operation. 2. An external sense resistor for driving an external MOSFET with PWM to control solenoid current for regulating the solenoid current. 3. The solenoid current ramps up quickly to ensure activation. 4. In the hold mode, the solenoid current is reduced to reduce power consumption and heat dissipation. 5. The ramp peak current, peak current duration, holding current and PWM clock frequency may be set externally, and these parameters may also be set to nominal values without the use of external components. 6. Protection thermal shutdown, Under Voltage Lockout (UVLO). 7. And (6) outputting the selectable state. 8. Working temperature range: -40 ℃ to +105 ℃.
Drawings
Fig. 1 is a schematic structural diagram of an electromagnetic actuator with an electromagnetic plunger motion detection circuit for implementing the present invention.
Fig. 2 is a schematic diagram of the structure of the solenoid current controller of fig. 1.
Fig. 3 is a schematic diagram of the structure of the electromagnetic plunger movement detection circuit in fig. 1.
The reference numbers are listed below: vs-solenoid on voltage terminal; rod-armature or plunger; d1 — first diode; ls-solenoid or coil; m1-first NMOS transistor; rsense-sense resistance; GND-ground; an SC-solenoid current controller; a LowPass Filter-low pass Filter; is-induced solenoid current; R1-R7-resistors with serial numbers; C1-C2-capacitors with serial numbers; s1 — first node; OSC-oscillators or oscillator nodes; VIN-voltage input node; d2 — second zener diode; LDO-low dropout linear regulator; a UVLO-undervoltage locker; thermal shutdown-Thermal shutdown; EN-enable terminal; g1-first gate circuit; m2-second NMOS tube; i-an induction current transformer; k1 — first switch; PWM Control-Pulse Width Modulation controller (PWM, i.e., Pulse Width Modulation); a1 — first amplifier; a2 — second amplifier; a3 — third amplifier; a REF-reference signal collector; MUX-MUX signal selector; a KEEP-KEEP signal terminal (KEEP terminal); PEAK-PEAK signal terminal; HOLD-HOLD signal terminal; SENSE-SENSE signal terminal; OUT-output signal terminal.
An Amplifier-operational Amplifier; a Buffer-Buffer; active Peak Detector-Active Peak Detector; an Adder; Comparator-Comparator; difference between IPEAKand IVALLEY(Threshold) -the difference between the peak current and the valley current (Threshold); i isTRIP-a comparator output current or a comparator output current value or an electromagnetic plunger movement detection result signal.
Detailed Description
The invention is described below with reference to the accompanying drawings (fig. 1-3).
Fig. 1 is a schematic structural diagram of an electromagnetic actuator with an electromagnetic plunger motion detection circuit for implementing the present invention. Fig. 2 is a schematic diagram of the structure of the solenoid current controller of fig. 1. Fig. 3 is a schematic diagram of the structure of the electromagnetic plunger movement detection circuit in fig. 1. As shown in fig. 1 to 3, an electromagnetic driver with an electromagnetic plunger movement detection circuit comprises a solenoid Ls and an electromagnetic plunger Rod adapted to the solenoid Ls, wherein the positive end of the solenoid Ls is connected with a solenoid switchThe voltage end Vs, the cathode end of the solenoid Ls is connected with the drain electrode of a first NMOS tube M1, the drain electrode of the first NMOS tube M1 is connected with the anode of a first diode D1, the cathode of the first diode D1 is connected with the solenoid access voltage end Vs, the source electrode of the first NMOS tube M1 is grounded through a sensing resistor Rsense, the gate electrode of the first NMOS tube M1 is connected with a driving signal end, two ends of the sensing resistor Rsense are connected in parallel with a Low Pass Filter, and the output end of the Low Pass Filter is connected with an electromagnetic plunger motion detection circuit. The electromagnetic plunger motion detection circuit comprises an operational Amplifier Amplifier, a Buffer, an Adder Adder, an Active Peak Detector Active Peak Detector and a Comparator Comarameter, wherein the input end of the operational Amplifier Amplifier Is connected with the output end of the Low Pass Filter Low Pass Filter to receive and amplify the induction solenoid current Is, the first path of the output end of the operational Amplifier Amplifier Is connected with the input end of the Buffer Buffer, the second path of the output end of the operational Amplifier Amplifier Is connected with the input end of the Active Peak Detector Active Peak Detector, the output end of the Buffer Buffer Is connected with the input end of the Adder Adder, the output end of the Adder Adder Is connected with the negative input end (-) of the Comparator Comarameter, the output end of the Active Peak Detector Active Peak Detector Is connected with the positive input end (+), the output end of the Comparator Comarameter outputs electromagnetic plunger motion detection result signals, the high or low value of the detection result signal corresponds to a normal or a failure of the solenoid plunger movement. The Adder adapter is internally provided with or connected with a threshold setting circuit, the threshold is a preset threshold, and the preset threshold represents Difference between peak current and valley current, namely Difference between I and IPEAKandIVALLEY(Threshold), the peak current IPEAKCorresponding to the initial moving time of the electromagnetic plunger, the valley current IVALLEYAnd corresponding to the inflection point moment after the electromagnetic current falls caused by the initial movement of the electromagnetic plunger.
The driving signal terminal is connected with an output signal terminal OUT of the solenoid current controller SC, the output signal terminal OUT is connected with the output terminal of a first amplifier A1, and the input terminal of the first amplifier A1 is connected with the output terminal of the pulse width modulation controller PWMControl.
The output signal end OUT is connected with a sensing signal end SENSE, the sensing signal end SENSE is connected with the source electrode of the first NMOS tube M1, the sensing signal end SENSE is connected with the first input end of a second amplifier a2, and the output end of the second amplifier a2 is connected with the third input end of the pulse width modulation controller PWM Control. One path of the sensing signal terminal SENSE is grounded through a ground terminal GND, the other path is connected with a maintaining signal terminal HOLD, the HOLD signal terminal HOLD is grounded through a resistor R6 in the first path, connected to the first input terminal of the multi-path signal selector MUX in the second path through a reference signal collector REF, connected to the PEAK signal terminal PEAK in the third path, the PEAK signal end PEAK is connected with the ground through a resistor R5 in the first path, connected with the second input end of the multi-path signal selector MUX in the second path through a reference signal collector REF in the second path, connected with a KEEP signal end KEEP in the third path, the first path of the KEEP signal terminal KEEP is grounded through a capacitor C2, the second path is connected with the positive input end (+) of the third amplifier A3, the third path is connected with the enable terminal EN, the output terminal of the third amplifier a3 is connected to the third input terminal of the multiplexer MUX, the output end of the multi-path signal selector MUX is connected with the second input end of the second amplifier A2. A positive input end (+) of the third amplifier a3 is connected to the induction current I through a first switch K1, a Control end of the first switch K1 is connected to a first input end of the PWM controller PWM Control, a second input end of the PWM controller PWM Control is connected to an oscillator node OSC through an oscillator, a first path of the oscillator node OSC is grounded through a resistor R7, a second path of the oscillator node OSC is connected to a drain of a second NMOS transistor M2 and the output signal terminal OUT through a first node S1, a source of the second NMOS transistor M2 is grounded, and a gate of the second NMOS transistor M2 is connected to the first input end of the PWM controller PWMControl. The first path of the enable end EN is connected with an oscillator node OSC through a voltage input node VIN, the second path of the enable end EN is connected with a resistor node through a resistor R3, the resistor node is grounded through a resistor R4, the resistor node is connected with the voltage input node VIN through a resistor R5, the voltage input node VIN is connected with the cathode of a second voltage-stabilizing diode D2, the anode of the second voltage-stabilizing diode D2 is grounded, the resistor node is connected with a third inverting input end of a first gate circuit G1, and the inverting output end of the first gate circuit is connected with the first input end of the pulse width modulation controller PWM Control. The voltage input node VIN is connected to ground through a capacitor C1 and to the solenoid input voltage terminal Vs through a resistor R1, respectively. The voltage input node VIN is connected with an under-voltage locker UVLO through a low dropout regulator LDO, the under-voltage locker UVLO is connected with a second input end of the first gate circuit G1, and a third input end of the first gate circuit G1 is connected with a thermal cut-off Thermalshutdown. The negative input end (-) of the third amplifier A3 is connected with the reference voltage end. The second amplifier a2 and the third amplifier A3 are both schmitt triggers.
Fig. 3 shows a block diagram of a plunger motion detection circuit consisting of an amplifier, an active peak current detector, a summing amplifier and a comparator, the detection logic being implemented by a simple operational amplifier circuit, rather than using a sensor or controller. The solenoid current is detected using a sense resistor, the voltage of which is amplified by an operational amplifier and simultaneously passed through an active peak detector and a level shifting device consisting of a buffer and an operational amplifier circuit. The plunger position at different nodes can detect the waveform of the circuit, and the peak detector output tracks the solenoid current until the 1 st point IPEAKThe electromagnetic plunger starts to move. After this point the solenoid current begins to decrease to point 2I due to back emfVALLEY. But the output value of the peak detector will remain at the peak value at point 1 and be fed back to the non-inverting input of the comparator.
The amplified solenoid current is obtained by adding a predefined threshold value, IPEAKAnd IVALLEYThe horizontal shift in absolute difference between. The inverting input of the comparator is fed with a level shifting solenoid current. Comparator ITRIPIs high and will latch when the level-shifted current is lower than the peak detector output. When the solenoid fails or does not move or moves slowly, the solenoid current will not have a sufficiently large or low tilt anglePredetermined threshold set by circuit parameters, comparator ITRIPThe output of (d) will always be low. I isPEAKAnd IVALLEYThe absolute difference between (thresholds) is different from different types of solenoids. In the proposed circuit, the threshold is set by using a resistive divider. Thus, different types of solenoids, based on IPEAKAnd IVALLEYThe absolute difference between them, the value of the resistive divider can be adjusted to determine the threshold.
It is pointed out here that the above description is helpful for the person skilled in the art to understand the invention, but does not limit the scope of protection of the invention. Any such equivalents, modifications and/or omissions as may be made without departing from the spirit and scope of the invention may be resorted to.
Claims (8)
1. An electromagnetic driver with an electromagnetic plunger motion detection circuit is characterized by comprising a solenoid and an electromagnetic plunger matched with the solenoid, wherein the positive end of the solenoid is connected with a solenoid access voltage end, the negative end of the solenoid is connected with the drain electrode of a first NMOS (N-channel metal oxide semiconductor) tube, the drain electrode of the first NMOS tube is connected with the positive electrode of a first diode, the negative electrode of the first diode is connected with the solenoid access voltage end, the source electrode of the first NMOS tube is grounded through a sensing resistor, the grid electrode of the first NMOS tube is connected with a driving signal end, two ends of the sensing resistor are connected with a low-pass filter in parallel, and the output end of the low-pass filter is connected with the electromagnetic plunger motion detection circuit;
the electromagnetic plunger motion detection circuit comprises an operational amplifier, a buffer, an adder, an active peak value detector and a comparator, wherein the input end of the operational amplifier is connected with the output end of the low-pass filter to receive and amplify the current of an induction solenoid, the first path of the output end of the operational amplifier is connected with the input end of the buffer, the second path of the output end of the operational amplifier is connected with the input end of the active peak value detector, the output end of the buffer is connected with the input end of the adder, the output end of the adder is connected with the negative input end of the comparator, the output end of the active peak value detector is connected with the positive input end of the comparator, the output end of the comparator outputs an electromagnetic plunger motion detection result signal, and the high value or the low value of the detection result signal corresponds to the normal or fault of the;
the adder is internally provided with or connected with a threshold setting circuit, the threshold is a preset threshold, the preset threshold represents a difference value between peak current and valley current, the peak current corresponds to the initial movement moment of the electromagnetic plunger, and the valley current corresponds to the inflection point moment after the electromagnetic current falls after the initial movement of the electromagnetic plunger.
2. An electromagnetic driver having an electromagnetic plunger motion detection circuit as claimed in claim 1, wherein said drive signal terminal is connected to an output signal terminal of a solenoid current controller, said output signal terminal is connected to an output terminal of a first amplifier, and an input terminal of said first amplifier is connected to an output terminal of a pulse width modulation controller.
3. The electromagnetic driver with the electromagnetic plunger motion detection circuit as claimed in claim 2, wherein the output signal terminal is connected to a sensing signal terminal, the sensing signal terminal is connected to the source of the first NMOS transistor, the sensing signal terminal is connected to a first input terminal of a second amplifier, and an output terminal of the second amplifier is connected to a third input terminal of the pwm controller.
4. The electromagnetic driver having an electromagnetic plunger motion detecting circuit of claim 3, it is characterized in that one path of the sensing signal end is grounded through a grounding end, the other path is connected with a maintaining signal end, the first path of the maintaining signal end is grounded through a resistor R6, the second path is connected with the first input end of the multi-path signal selector through the reference signal collector, the third path is connected with the peak signal end, the first path of the peak signal end is grounded through a resistor R5, the second path is connected with the second input end of the multi-path signal selector through a reference signal collector, the third path is connected with a signal holding end, the first path of the signal holding end is grounded through a capacitor C2, the second path is connected with the positive input end of the third amplifier, the third path is connected with the enabling end, the output end of the third amplifier is connected with the third input end of the multi-path signal selector, and the output end of the multi-path signal selector is connected with the second input end of the second amplifier.
5. The electromagnetic driver with the electromagnetic plunger motion detecting circuit as claimed in claim 4, wherein the positive input terminal of the third amplifier is connected to the inductive current device through a first switch, the control terminal of the first switch is connected to the first input terminal of the pwm controller, the second input terminal of the pwm controller is connected to an oscillator node through an oscillator, the oscillator node is connected to the first terminal through a resistor R7, the second terminal is connected to the drain of a second NMOS transistor and the output signal terminal through the first terminal, the source of the second NMOS transistor is connected to the ground, and the gate of the second NMOS transistor is connected to the first input terminal of the pwm controller.
6. The electromagnetic driver with electromagnetic plunger motion detection circuitry as claimed in claim 4, wherein the enable terminal is connected to the oscillator node via a first voltage input node, to the resistor node via a resistor R3, to ground via a resistor R4, to the voltage input node via a resistor R2, to the cathode of a second zener diode, to ground via the anode of the second zener diode, to the third inverting input terminal of a first gate circuit, the inverting output terminal of the first gate circuit being connected to the first input terminal of the PWM controller.
7. The electromagnetic driver with electromagnetic plunger motion detection circuitry as claimed in claim 6, wherein the voltage input node is connected to the solenoid applied voltage terminal through a capacitor C1 and through a resistor R1, respectively.
8. The electromagnetic driver with electromagnetic plunger motion detecting circuit as claimed in claim 6, wherein the voltage input node is connected to an under-voltage locker through a low dropout linear regulator, the under-voltage locker is connected to the second input terminal of the first gate circuit, and the third input terminal of the first gate circuit is connected to the thermal shutdown; the negative input end of the third amplifier is connected with a reference voltage end; the second amplifier and the third amplifier are both Schmitt triggers.
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| CN201711400037.3A CN109958815B (en) | 2017-12-22 | 2017-12-22 | Electromagnetic driver with electromagnetic plunger motion detection circuit |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0914486A (en) * | 1995-06-29 | 1997-01-14 | Uchida Yuatsu Kiki Kogyo Kk | Deriving control device for solenoid proportional valve and driving control method therefor |
| JP2006349614A (en) * | 2005-06-20 | 2006-12-28 | Hitachi Ltd | Coil abnormality detecting device |
| CN103348588A (en) * | 2011-03-08 | 2013-10-09 | 日立汽车系统株式会社 | Current control device |
| CN105042159A (en) * | 2015-07-24 | 2015-11-11 | 苏州市大力电器有限公司 | Electromagnetic valve drive device with fault diagnosis function and self-protection function |
-
2017
- 2017-12-22 CN CN201711400037.3A patent/CN109958815B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0914486A (en) * | 1995-06-29 | 1997-01-14 | Uchida Yuatsu Kiki Kogyo Kk | Deriving control device for solenoid proportional valve and driving control method therefor |
| JP2006349614A (en) * | 2005-06-20 | 2006-12-28 | Hitachi Ltd | Coil abnormality detecting device |
| CN103348588A (en) * | 2011-03-08 | 2013-10-09 | 日立汽车系统株式会社 | Current control device |
| CN105042159A (en) * | 2015-07-24 | 2015-11-11 | 苏州市大力电器有限公司 | Electromagnetic valve drive device with fault diagnosis function and self-protection function |
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