CN101404199B - Electromagnet controller - Google Patents
Electromagnet controller Download PDFInfo
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- CN101404199B CN101404199B CN2008100222904A CN200810022290A CN101404199B CN 101404199 B CN101404199 B CN 101404199B CN 2008100222904 A CN2008100222904 A CN 2008100222904A CN 200810022290 A CN200810022290 A CN 200810022290A CN 101404199 B CN101404199 B CN 101404199B
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Abstract
The invention provides an electromagnet control device, belonging to the field of control and protection electric apparatuses. The electromagnet control device comprises a bridge-typed rectifier which is connected with an external power, a power converter which is provided with disconnection points and is connected with the external power, a power electronic device which is connected with the output end of the bridge-typed rectifier, a sampling resistance which is connected with the power electronic device in series, a coil which is connected with the output voltage of the bridge-typed rectifier after being connected with the sampling resistance in series, and a central control module which is connected with the power converter, the power electronic device and the sampling resistance and used for controlling the electromagnet; the electromagnet control device is characterized in that the closed voltage of the electromagnet is controlled by the coil current measured by the central control module and has the advantages that a set of simple device which can monitor the voltage of the power and the current of the coil at the same time is provided, the monitoring of the voltage of the power and the current of the coil is realized by monitoring the current of the coil, the micro-processor is changed into a special pulse-width modulation chip, the cost is greatly reduced, furthermore, the anti-interference of the system is greatly improved as the isolation problem is not needed for consideration.
Description
Technical field
The present invention relates to a kind of electromagnet control device, belong to control and protection appliance field.
Background technology
Be used to disconnect or the general control of adopting the device that has input voltage detection circuit to realize electromagnet closing point and cut-off point of control device of closing electromagnets, circuit-breaker control device described in Chinese invention patent 99122867.7 comprises the device that is used for measuring first voltage (U2) of representing supply voltage (Ua), it adopts the method for electric resistance partial pressure and obtains, and the monitoring of electric current realizes by resistance R 1, adopt two cover measurement mechanisms to measure supply voltage and coil current respectively, the circuit complexity, and the described control device of this patent adopts microprocessor to realize control, cost is higher, and the reference ground of input power supply U1 is shared with the reference ground of microprocessor, and the anti-interference of whole system is relatively poor.
Summary of the invention
The purpose of this invention is to provide the electromagnet control device that a kind of circuit is simple, cost is low, anti-interference is high.
The object of the present invention is achieved like this, a kind of electromagnet control device, it comprises bridge rectifier B1, power supply changeover device with cut-off point, central control module, power electronic device Q1, sampling resistor R1, coil L1 and diode D1, power supply changeover device input and bridge rectifier B1 input and external control power supply L+, N-connects, the output 3 of bridge rectifier B1 is connected with power electronic device Q1 input, the end of the output of power electronic device Q1 and sampling resistor R1, the negative electrode of diode D1 is connected with central control module, the control utmost point of power electronic device Q1 is connected with central control module, the other end of sampling resistor R1 is connected with the end of coil L1, the other end of coil L1 is connected with the anode of diode D1 and another output 4 of bridge rectifier B1, the power supply changeover device output is connected with central control module, it is characterized in that: the coil current that the sealing voltage of electromagnet is recorded by central control module is controlled, central control module is gathered electromagnet coil current by sampling resistor R1, the attract current reference signal of current monitoring circuit in the voltage signal of coil current signal after ratio is amplified and the central control module is compared the closure of realization electromagnet; Central control module also comprises pulse modulated circuit, current monitoring circuit and current feedback circuit, the pulse modulated circuit of central control module is connected with the control utmost point of power device Q1, pulse modulated circuit is connected with current feedback circuit with current monitoring circuit, current monitoring circuit is connected with current feedback circuit, current monitoring circuit is connected with the tie point of power electronic device Q1 with sampling resistor R1 with current feedback circuit, and power supply changeover device is connected with pulse modulated circuit, current monitoring circuit and current feedback circuit.
The off voltage of electromagnet is controlled by the off voltage of power supply changeover device.
The reference ground of electromagnet control device is between sampling resistor R1 and coil L1.
The effect that the present invention embodied: a simple supply voltage of cover and coil current device for monitoring simultaneously is provided, the monitoring of supply voltage and coil current is all realized by the monitoring coil current, and change microprocessor into special-purpose pulse width modulating chip, greatly reduce cost, and owing to the problem that need not to isolate is increased dramatically the anti-interference of system with considering.
Fig. 1 is an electromagnet control device structured flowchart of the present invention.
Description of drawings
Fig. 2 indicating impulse modulation circuit.
Fig. 3 represents current monitoring circuit.
Fig. 4 represents current feedback circuit.
Fig. 5 represents converter circuitry of power
With reference to Fig. 1, this is the electromagnet control device structured flowchart.
Embodiment
Described electromagnet control device comprises: bridge rectifier B1, power supply changeover device with cut-off point, power electronic device Q1, the sampling resistor R1 that connects with power electronic device Q1, with the coil L1 that links to each other with bridge rectifier B1 output voltage after the sampling resistor R1 series connection, central control module is used to control electromagnet.In practice, sustained diode 1 and coil L1 parallel connection.The input of power supply changeover device links to each other with the external control power supply, the output of power supply changeover device links to each other with central control module, the input 1 of bridge rectifier B1,2 link to each other with the external control power supply, the output plus terminal 3 of bridge rectifier B1 links to each other with power electronic device Q1 input, output negative terminal 4 links to each other with 2 ends of coil L1 and the anode of sustained diode 1, the control signal DRIVER of the control output end of central control module extremely links to each other with the control of power electronic device Q1, the negative electrode of the output of power electronic device Q1 and sustained diode 1, sampling resistor R1 one end links to each other with central control module, and the other end of sampling resistor R1 links to each other with 1 end of coil L1.
The coil current that the sealing voltage of the electromagnet in the described control device is recorded by central control module is controlled, and the off voltage of electromagnet is controlled by the off voltage of power supply changeover device.The earth terminal GND of reference ground between sampling resistor R1 and coil L1 of control device.
Pulse modulated circuit figure with reference to Fig. 2.
Pulse modulated circuit comprises second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the 7th resistance R 7, first capacitor C 1, second capacitor C 2 and chip U3, that its chips U3 adopts is TL494, the voltage signal Vc of one termination current feedback circuit of second resistance R 2, the other end of second resistance R 2 is connected with an end of the 3rd resistance R 3 and 2 pin of chip U3, the other end of the 3rd resistance R 3 is connected with 3 pin of chip U3, the voltage signal Vf of one termination current feedback circuit of the 4th resistance R 4, the other end of the 4th resistance R 4 is connected with an end of the 5th resistance R 5 and 1 pin of chip U3,5 of chip U3,6,9 pin connect an end of second capacitor C 2 respectively, one end of one end of the 6th resistance R 6 and the 7th resistance R 7, the other end output control signal DRIVER of the 7th resistance R 7,8 of chip U3,11,12 pin connect the DC power supply of current converter output, the 14 pin output reference voltage Vref of chip U3 also are connected to this reference voltage signal 15 pin of chip U3, the input signal Vdead of chip U3 is provided by current monitoring circuit, 14 of one end of first capacitor C 1 and chip U3,15 pin connect, the 5th resistance R 5, the other end of the 6th resistance R 6, first capacitor C 1,7 of the other end of second capacitor C 2 and chip U3,13,16 pin are connected with earth terminal GND1.
The voltage signal Vf that pulse modulated circuit is brought current feedback circuit is connected to in-phase input end 1 pin of chip U3 after the 4th resistance R 4, the 5th resistance R 5 dividing potential drops, voltage signal Vc is connected to inverting input 2 pin and feedback input end 3 pin of chip U3 through second resistance R 2, the 3rd resistance R 3, and chip U3 adopts TL494.When the Vdead signal of 4 pin of chip U3 was the lower second dead band voltage Vdead1, chip U3 to reach the purpose of Control current, realized constant current control according to the duty ratio that the current feedback signal Vf that gathers adjusts the control signal DRIVER of output in real time.When the Vdead signal of 4 pin of chip U3 was the higher first dead band voltage Vdead2, the output control signal was clamped under the very little duty ratio condition, makes that the electric current among the electromagnet coil L1 is very little, far is not enough to the adhesive electromagnet.Pulse modulated circuit chip U3 has inner oscillator, 6 pin of chip U3 are connect the 6th resistance R 6 over the ground, 5 pin of chip U3 connect second capacitor C 2 over the ground, by constant current charge and repid discharge to second capacitor C 2, thereby generation sawtooth waveforms, this sawtooth waveforms offers the PWM comparator of chip U3 inside, by change the 6th resistance R 6, second capacitor C, 2 values can change control frequency.First capacitor C 1 is a filter capacitor, 7 metering functions of the 7th resistance R.
Current monitoring circuit figure with reference to Fig. 3.
One termination sampling resistor R1 of the tenth resistance R 10 and the tie point of power electronic device Q1,3 pin of another termination operational amplifier U1A of the tenth resistance R 10 and an end of the 3rd capacitor C 3.One end of the 11 resistance R 11 is connected with earth terminal GND, the other end of the 11 resistance R 11 is connected with 2 pin of operational amplifier U1A and an end of the 12 resistance R 12, the other end of the 12 resistance R 12 is connected with 1 pin of operational amplifier U1A and 6 pin of operational amplifier U2B, and 8 pin of operational amplifier U1A meet DC power supply 24V.5 pin of operational amplifier U2B are connected with 1 pin of chip U4, and 7 pin of operational amplifier U2B are connected with an end of an end of the 13 resistance R 13, the 4th capacitor C 4 and 9,10 pin of chip U4, and the other end of the 13 resistance R 13 is connected with reference voltage Vref.One termination reference voltage Vref of the 24 resistance R 24,5 pin of another chip termination U4 of the 24 resistance R 24,4 pin of a chip termination U4 of the 5th capacitor C 5.16 pin of chip U4 and the 14 resistance R 14, the 15 resistance R 15, the 18 resistance R 18, the 20 resistance R 20, one end of the 22 resistance R 22 is connected with reference voltage Vref, one end of the other end of the 14 resistance R 14 and the 16 resistance R 16 is connected with 2 pin of chip U4, one end of the other end of the 15 resistance R 15 and the 17 resistance R 17 is connected with 1 pin of chip U4, one end of the other end of the 18 resistance R 18 and the 19 resistance R 19 is connected with 12 pin of chip U4, one end of the other end of the 20 resistance R 20 and the 21 resistance R 21 is connected with 13 pin of chip U4, and an end of the other end of the 22 resistance R 22 and the 23 resistance R 23 is connected with 2 pin of operational amplifier U5A.3 pin of operational amplifier U5A connect 4 pin of chip U4,8 pin of operational amplifier U5A meet DC power supply 24V, 1 pin of operational amplifier U5A is connected another termination reference voltage Vref of the 25 resistance R 25 with an end of the 6th capacitor C 6, an end of the 25 resistance R 25 and 11 pin of chip U4.4 pin of operational amplifier U5A are connected with earth terminal GND1 with the other end of the 6th capacitor C 6, and the other end of the 4th capacitor C 4, the 5th capacitor C 5,6,7,8 pin of chip U4 and the other end of the 16 resistance R the 16, the 17 resistance R the 17, the 19 resistance R the 19, the 21 resistance R 21, the 23 resistance R 23 are connected with earth terminal GND.
The Isen voltage signal of the reflection coil current value of adopting by sampling resistor R1 among Fig. 1, through operational amplifier U1A, the tenth resistance R 10 and the 11 resistance R 11, the 12 resistance R 12 ratios are amplified the first back and higher dead band voltage Vdead2 and are compared, as the voltage Vsen of 1 pin of operational amplifier U1A during less than the first dead band voltage Vdead2, the voltage signal BOOL2 of 7 pin of operational amplifier U2B is a high level, 9 of analog selection switch chip U4,10 pin are high level, make 1 pin and the 15 pin conductings of chip U4, this moment, the first higher dead band voltage Vdead2 was connected to dead band control end 4 pin of chip U3, make the output pulse duty factor of chip U3 be clamped at a smaller value, and the coil current Isen of this moment also is not enough to allow electromagnetic actuation; As voltage Vsen during greater than the first dead band voltage Vdead2, voltage signal BOOL2 is a low level, 9,10 pin of analog selection switch chip U4 are low level, make 2 pin and the 15 pin conductings of chip U4, this moment, the second lower dead band voltage Vdead1 was connected to dead band control end 4 pin of chip U3, made the output pulse duty factor of chip U3 increase closing electromagnets, chip U3 carries out bigger attract current control according to the current signal of sampling simultaneously, and then controls with less holding current.Through the 18 resistance R 18, the signal Vj1 that obtains after the 19 resistance R 19 dividing potential drops is the attract current reference signal, through the 20 resistance R 20, the signal Vj2 that obtains after the 21 resistance R 21 dividing potential drops is the holding current reference signal, through the 22 resistance R 22, the signal Vyshij that obtains after the 23 resistance R 23 dividing potential drops is the reference signal of attract current retention time, when reference voltage Vref powers on, voltage signal BOOL is a low level, 12 pin of analog selection switch chip U4 and 14 pin conductings, the attract current reference signal Vj1 give Vj, deliver to current feedback circuit again, because voltage signal BOOL2 is similarly low level, 5 pin of analog selection switch chip U4 and 4 pin conductings, reference voltage Vref is by 5 chargings of 24 pairs the 5th capacitor C of the 24 resistance R, as the voltage Vyshi on the 5th capacitor C 5 during greater than the reference signal Vyshij of attract current retention time, voltage signal BOOL2 exports high level, 13 pin of analog selection switch chip U4 and 14 pin conductings, the holding current reference signal Vj2 give Vj, delivers to current feedback circuit again.That chip U4 adopts is CD4053, and that operational amplifier U1 adopts is LM258, and that operational amplifier U2, U5 adopt is LM293D.
Current feedback circuit figure with reference to Fig. 4.
One termination sampling resistor R1 of the 26 resistance R 26 and the tie point of power electronic device Q1, the other end of the 12 resistance R 26 is connected with an end of the 7th capacitor C 7 and 5 pin of operational amplifier U1B.One end of the 27 resistance R 27 is connected with 6 pin of an end of the 28 resistance R 28 and operational amplifier U1B, and 7 pin of the other end of the 28 resistance R 28 and operational amplifier U1B meet the voltage signal Vf of pulse modulated circuit.14 pin of chip U4 in the one termination current monitoring circuit of the 29 resistance R 29, the other end of the 29 resistance R 29 is connected with an end of the 8th capacitor C 8 and 3 pin of operational amplifier U2A.One end of the 30 resistance R 30 is connected with 2 pin of an end of the 31 resistance R 31 and operational amplifier U2A, and 1 pin of the other end of the 31 resistance R 31 and operational amplifier U2A meets the voltage signal Vc of pulse modulated circuit.8 pin of operational amplifier U2A meet DC power supply 24V, and the other end of the other end of the 27 resistance R 27, the 30 resistance R 30, the 7th capacitor C 7, the 8th capacitor C 8 and 4 pin of operational amplifier U2A are connected with earth terminal GND.
The Isen voltage signal of the reflection coil current value of adopting by sampling resistor R1 among Fig. 1, the voltage signal Vf after operational amplifier U1B, the 27 resistance R the 27, the 28 resistance R 28 ratios are amplified is connected to pulse modulated circuit.The 26 resistance R 26 and 7 current limliting filter actions of the 7th capacitor C.The voltage signal Vc of voltage signal Vj after operational amplifier U2A, the 29 resistance R 29 and the 30 resistance R the 30, the 31 resistance R 31 ratios are amplified is connected to pulse modulated circuit, this signal is pick-up voltage benchmark or sustaining voltage benchmark, the 29 resistance R 29,8 current limliting filter actions of the 8th capacitor C.
Converter circuitry of power figure with reference to Fig. 5.
One end of the 9th capacitor C 9 is connected with the end of phase line L+ and coil L2, and the other end of the 9th capacitor C 9 is connected with the end of zero line N-and coil L3.The other end of coil L2 is connected with the end of piezo-resistance RV1 and 1 pin of modular converter T, and the other end of coil L3 is connected with the other end of piezo-resistance RV1 and 3 pin of modular converter T.The two ends of the tenth capacitor C 10 are connected with 22,26 pin of modular converter T1 respectively.The negative electrode of 16 pin of modular converter T and TVS pipe D2 and an end of the 11 capacitor C 11 are connected, and output DC source 24V, and 14 pin of modular converter T1 are managed another negative electrode of D2 with TVS, the other end of the 11 capacitor C 11 is connected with earth terminal GND.
Power supply changeover device is converted to the 24V DC power supply by AC/DC modular converter T1 with alternating voltage, the 9th capacitor C 9, inductance L 2, L3 strobe, piezo-resistance RV1 rises and prevents action of high voltage, the tenth capacitor C 10 strobes, TVS pipe D2 plays anti-electromagnetic interference effect, and the 11 capacitor C 11 strobes.Reference voltage V ref in the circuit can be produced voluntarily by pulse width modulating chip U3 in addition, thereby need not to add in addition the switch power supply.The release voltage value of electromagnet is the cut-off point magnitude of voltage of above-mentioned AC/DC, and this is the device property of AC/DC modular converter T1 itself, and its operating voltage is 80V, and off voltage is 65V.When supply voltage is lower than 65V, this AC/DC modular converter T1 does not have the output of 24V DC power supply, thereby makes whole central control module not have working power, does not just have control signal yet and exports power electronic device Q1 to, this power electronic device Q1 is in cut-off state, makes electromagnet discharge.That modular converter T1 adopts is LD03-OOB24.
When power supply was DC power supply, same available said method was controlled the sealing voltage of electromagnet by the electric current of monitoring electromagnet coil.
According to one embodiment of the present of invention, central control module is gathered electromagnet coil current by sampling resistor, with coil current signal after ratio is amplified voltage signal Vsen and higher attract current reference signal Vj1 compare, as Vsen during less than Vj1, the first higher dead band voltage Vdead2 is delivered to dead band control end 4 pin of the chip U3 of pulse modulated circuit by analog selection switch chip U4, thereby the duty ratio that pulse modulated circuit is exported to the control signal of the power electronic device Q1 control utmost point is clamped down on a very little value, it is very little just to make supply voltage be applied to the voltage at electromagnet coil L1 two ends, the electric current that promptly flows through electromagnet coil L1 is very little, this little current signal is not enough to the adhesive electromagnet, makes electromagnet remain on off-state; As Vsen during greater than Vj1, the second dead band voltage Vdead1 that will be lower by analog selection switch chip U4 delivers to dead band control end 4 pin of the chip U3 of pulse modulated circuit, the duty ratio that this moment, pulse modulated circuit exported the control signal of the power electronic device Q1 control utmost point to can be regulated automatically according to attract current reference signal Vj1, and behind short time delay, switch to according to holding current reference signal Vj2 and regulate automatically, realization constant current control has realized that promptly the coil current that the sealing voltage of electromagnet is recorded by central control module controls.The off voltage of electromagnet is controlled by the cut-off point of power supply changeover device, power supply changeover device among the present invention has cut-off point, i.e. no-voltage output when supply voltage is lower than cut-off point, thereby make whole central control module not have working power, just do not have control signal yet and export power electronic device Q1 to, this power electronic device Q1 is in cut-off state, makes electromagnet discharge.
Claims (3)
1. electromagnet control device, it comprises bridge rectifier (B1), power supply changeover device with cut-off point, central control module, power electronic device (Q1), sampling resistor (R1), coil (L1) and diode (D1), power supply changeover device input and bridge rectifier (B1) input and external control power supply (L+, N-) connect, one output (3) of bridge rectifier (B1) is connected with power electronic device (Q1) input, one end of the output of power electronic device (Q1) and sampling resistor (R1), the negative electrode of diode (D1) is connected with central control module, the control utmost point of power electronic device (Q1) is connected with central control module, the other end of sampling resistor (R1) is connected with an end of coil (L1), the other end of coil (L1) is connected with the anode of diode (D1) and another output (4) of bridge rectifier (B1), the power supply changeover device output is connected with central control module, it is characterized in that: the coil current that the sealing voltage of electromagnet is recorded by central control module is controlled, central control module is gathered electromagnet coil current by sampling resistor (R1), the attract current reference signal of current monitoring circuit in the voltage signal of coil current signal after ratio is amplified and the central control module is compared the closure of realization electromagnet; Central control module also comprises pulse modulated circuit, current monitoring circuit and current feedback circuit, the pulse modulated circuit of central control module is connected with the control utmost point of power device (Q1), pulse modulated circuit is connected with current feedback circuit with current monitoring circuit, current monitoring circuit is connected with current feedback circuit, current monitoring circuit is connected with the tie point of sampling resistor (R1) with power electronic device (Q1) with current feedback circuit, and power supply changeover device is connected with pulse modulated circuit, current monitoring circuit and current feedback circuit.
2. electromagnet control device according to claim 1 is characterized in that the off voltage of electromagnet is controlled by the off voltage of power supply changeover device.
3. electromagnet control device according to claim 1 is characterized in that the reference ground of electromagnet control device is positioned between sampling resistor (R1) and the coil (L1).
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| CN2008100222904A CN101404199B (en) | 2008-07-01 | 2008-07-01 | Electromagnet controller |
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| CN2008100222904A CN101404199B (en) | 2008-07-01 | 2008-07-01 | Electromagnet controller |
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| CN101404199A CN101404199A (en) | 2009-04-08 |
| CN101404199B true CN101404199B (en) | 2011-10-19 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104048711B (en) * | 2014-07-04 | 2017-07-18 | 威海市天罡仪表股份有限公司 | Electromagnetic field multi-level intensity switching circuit and its switching computational methods |
| CN104935069A (en) * | 2015-07-03 | 2015-09-23 | 常熟开关制造有限公司(原常熟开关厂） | Dual power supply changeover switch, control method thereof and dual power supply device |
| CN112837887B (en) * | 2019-11-25 | 2022-09-09 | 北京华航无线电测量研究所 | Local alternating magnetic field generating device of time division multiplexing system |
| CN114582585A (en) * | 2022-03-09 | 2022-06-03 | 青岛迈金智能科技股份有限公司 | Hybrid modulation driving system and method of electromagnet |
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| EP0901057A2 (en) * | 1997-09-05 | 1999-03-10 | FESTO AG & Co | Current regulation circuit |
| JP2000340423A (en) * | 1999-05-25 | 2000-12-08 | Miki Pulley Co Ltd | Power supply equipment for sorting conveyer provided with electromagnetic coil type switching device |
| CN1815659A (en) * | 2006-01-19 | 2006-08-09 | 常熟开关制造有限公司(原常熟开关厂） | Electromagnet control device |
| CN101127283A (en) * | 2007-06-08 | 2008-02-20 | 西安交通大学 | Low voltage electrical appliance intelligent control method based on current-varying mode |
| CN101127286A (en) * | 2007-07-17 | 2008-02-20 | 西安交通大学 | Permanent magnetic machine controller based on pulse modulation technology |
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2008
- 2008-07-01 CN CN2008100222904A patent/CN101404199B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0901057A2 (en) * | 1997-09-05 | 1999-03-10 | FESTO AG & Co | Current regulation circuit |
| JP2000340423A (en) * | 1999-05-25 | 2000-12-08 | Miki Pulley Co Ltd | Power supply equipment for sorting conveyer provided with electromagnetic coil type switching device |
| CN1815659A (en) * | 2006-01-19 | 2006-08-09 | 常熟开关制造有限公司(原常熟开关厂） | Electromagnet control device |
| CN101127283A (en) * | 2007-06-08 | 2008-02-20 | 西安交通大学 | Low voltage electrical appliance intelligent control method based on current-varying mode |
| CN101127286A (en) * | 2007-07-17 | 2008-02-20 | 西安交通大学 | Permanent magnetic machine controller based on pulse modulation technology |
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