CN106877772B - Three-phase contactless AC switch capable of replacing AC contactor - Google Patents
Three-phase contactless AC switch capable of replacing AC contactor Download PDFInfo
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- CN106877772B CN106877772B CN201710003306.6A CN201710003306A CN106877772B CN 106877772 B CN106877772 B CN 106877772B CN 201710003306 A CN201710003306 A CN 201710003306A CN 106877772 B CN106877772 B CN 106877772B
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- 230000002457 bidirectional effect Effects 0.000 claims description 12
- 230000001052 transient effect Effects 0.000 claims description 7
- 230000001629 suppression Effects 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 239000013078 crystal Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 8
- 230000002441 reversible effect Effects 0.000 abstract description 6
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 9
- 230000008033 biological extinction Effects 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 5
- 229920006395 saturated elastomer Polymers 0.000 description 5
- 238000009434 installation Methods 0.000 description 4
- 230000006641 stabilisation Effects 0.000 description 4
- 238000011105 stabilization Methods 0.000 description 4
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- 230000001105 regulatory effect Effects 0.000 description 2
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/032—Preventing damage to the motor, e.g. setting individual current limits for different drive conditions
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Abstract
The invention relates to a non-contact alternating current switch, in particular to a three-phase non-contact alternating current switch capable of replacing an alternating current contactor. The invention provides a three-phase contactless AC switch capable of replacing an AC contactor, which has no noise or spark during operation and phase failure protection; the zero-crossing trigger is adopted, so that the service life of the switch is prolonged, the impact of high current on the motor during starting is reduced, and the method is suitable for controlling the occasion of frequent starting and frequent forward and reverse switching of the motor. The device comprises a main control module, an overheat control circuit, a startup power supply detection circuit, a phase failure breakdown detection circuit, a trigger circuit, a normally open normally closed contact output circuit and a main loop; the main control module is respectively connected with the trigger circuit, the overheat control circuit, the startup power supply detection circuit and the phase failure breakdown detection circuit; the startup power supply detection circuit is respectively connected with the overheat control circuit and the normally open normally closed contact output circuit; the trigger circuit is respectively connected with the normally open normally closed contact circuit and the main loop.
Description
Technical Field
The invention relates to a non-contact alternating current switch, in particular to a three-phase non-contact alternating current switch capable of replacing an alternating current contactor.
Background
In the field of low-voltage electrical appliances, ac switches mostly employ conventional ac contactors. In particular, ac contactors are used very widely and everywhere in steel mills, in gate cranes for harbours and other electric drive systems. However, there are a number of problems which are unavoidable due to the electromagnetic mechanical contact structure of the conventional ac contactor.
Firstly, the electromagnetic mechanical contact inevitably generates an electric arc in the sucking and breaking process, and the electric arc generated by the larger current is larger, so that various means are needed to be adopted for arc extinction. Common arc extinguishing methods are: gate arc extinction, multiple break arc extinction, clay cover arc extinction, and the like. However, no matter which method is adopted for arc extinction, arc generated in the sucking and breaking processes can ablate the mechanical contacts, the contact resistance between the contacts can be increased if the arc is light, and the contacts can not be contacted or fusion welding can be carried out to cause contact adhesion if the arc is severe; the service life of the traditional alternating current contactor is objectively limited, and the traditional alternating current contactor cannot be applied to the explosion-proof field. Therefore, when an ac contactor is used, the replacement frequency is very high.
Secondly, in the occasion of controlling frequent start and frequent forward and reverse rotation switching of the three-phase motor, because the traditional alternating current contactor does not have phase failure protection, once the situation of contact adhesion or poor contact occurs, the three-phase motor is burnt out due to phase failure operation.
Moreover, because the traditional alternating current contactor adopts electromagnetic coils to electrify to drive electromagnets to act so as to switch mechanical contacts, the work is often accompanied with obvious alternating current noise and vibration noise of an iron core.
In addition, various faults such as incapability of closing a contactor after power is on, incapability of releasing the contactor after power is off, heating of a contact, immediate release of the contactor after a start button is released and the like often occur.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides the three-phase contactless AC switch capable of replacing an AC contactor, which has no noise and no spark during operation, has phase failure protection and prolongs the service life of a motor; the zero-crossing trigger is adopted, so that the service life of the switch is prolonged, the impact of high current on the motor during starting is reduced, and the method is suitable for controlling the occasion of frequent starting and frequent forward and reverse switching of the motor.
The invention provides a three-phase contactless alternating current switch capable of replacing an alternating current contactor, which is characterized by comprising a main control module, an overheat control circuit, a starting power supply detection circuit, a phase failure breakdown detection circuit, a trigger circuit, a normally open normally closed contact output circuit and a main loop.
The main control module is respectively connected with the trigger circuit, the overheat control circuit, the startup power supply detection circuit and the open-phase breakdown detection circuit.
The starting power supply detection circuit is respectively connected with the over-temperature and over-temperature control circuit and the normally-open and normally-closed contact output circuit.
The trigger circuit is respectively connected with the normally open and normally closed contact circuit and the main loop.
The trigger circuit also receives a control signal from an external host.
As a preferable scheme of the invention, the main loop adopts thyristors, thyristors with different specifications are selected according to different current capacities to be connected in anti-parallel to replace mechanical contacts of the traditional alternating current contactor, and the conduction of the thyristors is controlled in a zero-crossing triggering mode.
As another preferable scheme of the invention, the master control module collects the singlechip and the minimum system thereof.
As another preferable scheme of the invention, the singlechip is STC15W204S singlechip of macro-crystal technology Co.
As another preferred scheme of the invention, the normally open normally closed contact output circuit comprises an optocoupler U001, wherein the positive electrode of a light emitting diode in the optocoupler U001 is connected with the positive electrode of a power supply through a resistor R008, the negative electrode of the light emitting diode in the optocoupler U001 is connected with an I/O port of a main control module, the collector output end of the optocoupler U001 is connected with the collector of a triode T004, the base of the T004 is connected with the emitter output end of the U001 through a resistor R009, the collector of the T004 is also connected with the positive electrode of the power supply, the emitter of the T004 is respectively connected with the negative electrode of a diode D107, one end of a coil of a relay JDQ101 and one end of a coil of a relay JDQ102, and the positive electrode of the diode D107, the other end of the coil of the relay JDQ101 and the other end of the coil of the relay JDQ102 are connected with the ground.
As another preferred aspect of the present invention, the phase-failure breakdown detection circuit includes: one end of the resistor R201 is connected with the capacitor C201 in parallel and then connected with the A ' of the three-phase output end, one end of the resistor R202 is connected with the capacitor C202 in parallel and then connected with the B ' of the three-phase output end, one end of the resistor R203 is connected with the capacitor C203 in parallel and then connected with the C ' of the three-phase output end, and the other ends of the three-way resistors are converged to one point and then connected with one input end of a rectifier bridge formed by the diodes D201, D202, D203 and D204; the other input end of the rectifier bridge is connected with a zero line; the positive electrode of the output end of the rectifier bridge is connected with one end of a current limiting resistor R204, and the other end of the R204 is the positive electrode of a power supply; the negative electrode of the output end of the rectifier bridge is grounded; a filter capacitor C204 and a transient voltage suppression diode D208 are also connected between the anode and the cathode of the power supply; wherein the positive electrode of C204 is connected with the positive electrode of the power supply and one end of R204, and the negative electrode of C204 is connected with the ground; the negative electrode of the D208 is connected with the positive electrode of the power supply, and the positive electrode of the D208 is connected with the ground; the output end of the power supply is also connected with a voltage stabilizing circuit consisting of a PNP tube T201, a voltage stabilizing diode T202, a resistor R205, a resistor R207 and a resistor R208; the collector of T201 is grounded, the emitter is connected with the positive electrode of the power supply, R205 is connected with T202 in series, and the base is connected with the voltage division point after R205 is connected with T202 in series: the base electrode is respectively connected with one end of R205 and the cathode of T202, the other end of R205 is connected with the positive electrode of the power supply, and the anode of T202 is grounded; the adjusting end of T202 is connected with the serial partial pressure points of R207 and R208; the power supply output end is also connected with a delay circuit consisting of a diode D207, a resistor R210, an electrolytic capacitor C205, a triode T203 and a resistor R211, wherein the R210 and the D207 are connected in parallel and then connected with the positive electrode of the C205 in series, and the common point after the connection is connected with the base electrode of the T203; the negative electrode of D207 is connected with the positive electrode of the power supply, and the negative electrode of C205 is grounded; the emitter of the T203 is grounded, the collector of the T203 is connected with the positive electrode of the power supply through a load resistor R211, the collector of the T203 is also connected with the main control module, and the main control module is immediately informed when breakdown or phase failure occurs.
As another preferred embodiment of the present invention, the overheat control circuit includes: the device comprises an over-temperature overheat detection part consisting of a dual-voltage comparator U401 and related belonging elements and an over-temperature cooling power supply part consisting of an optocoupler U402, a bidirectional thyristor T401 and related belonging elements.
An overheat detection section: the dual-voltage comparator U401 adopts a chip LM393, the 4 pins of the U401 are grounded, and the 8 pins are connected with a power supply VCC; the 1, 2 and 3 pins of the U401 form a voltage comparator V1, the 1 pin of the U401 is an output end of the V1, the 1 pin of the U401 is connected with a main control module, and a resistor R409 is connected between the 1 pin of the U401 and VCC in parallel; the 2 pin of the U401 is connected with the voltage division point of the adjustable resistor RW401, the resistor R401 and the resistor R402 after being connected in series, one end of the RW401 is connected with the power VCC after being connected in series with the R401, the other end of the RW401 is respectively connected with one end of the R402 and the 2 pin of the U401, and the other end of the R402 is grounded; one end of a resistor R403 is connected with one end of a thermistor R404, a 3-pin of the U401 is connected with a voltage division point which is connected in series through the resistor R403 and the thermistor R404, the other end of the R403 is connected with a power supply VCC, and the other end of the R404 is grounded; the pins 5, 6 and 7 of the U401 form a voltage comparator V2, and the pin 7 of the U401 is an output end of the V2 and is connected with the main control module; the pin 7 of the U401 is also connected with one end of a resistor R410, and the other end of the R410 is connected with a power supply VCC; the 6 pins of the U401 are connected with the voltage division point after the adjustable resistor RW402, the resistor R405 and the resistor R406 are connected in series: one end of RW402 is connected with one end of R405, the other end of RW402 is connected with power VCC, the other end of R405 is respectively connected with one end of R406 and pin 6 of U401, and the other end of R406 is grounded; one end of the resistor R407 is connected with one end of the thermistor R408, the 5 pin of the U401 is connected with a voltage division point which is connected with the thermistor R408 in series through the R407, the other end of the R407 is connected with the power VCC, and the other end of the R408 is grounded.
An over-temperature cooling power supply part: the end T1 of the bidirectional thyristor T401 is respectively connected with an alternating current input and a resistor R411, the other end T2 of the T401 is respectively connected with an output socket J403 and one end of a capacitor C401, the other end of the C401 is respectively connected with one end of the R411 and one end of the R412, the other end of the R412 is connected with one end of a bidirectional trigger diode of the optocoupler U402, and the other end of the bidirectional trigger diode is connected with a control electrode of the T401; the positive input end of the U402 is connected with one end of a resistor R413, the other end of the R413 is connected with a power supply VCC, and the negative input end of the U402 is connected with a main control module.
As another preferred aspect of the present invention, the trigger circuit includes: an externally input alternating current signal control part, a rectifying and voltage stabilizing part and a trigger signal forming part.
An externally input ac signal control section: the end T1 of the bidirectional thyristor T103 is respectively connected with the pin 2 of the input alternating current signal plug-in J101 and the resistor R121, the resistor R101, the capacitor C102 and the capacitor C101 are connected in parallel, the other end T2 of the T103 is connected with a parallel end of the C101, the C102 and the R101 after being connected in parallel, the other end T2 of the T103 is also connected with one end of the capacitor C104, and the other end of the C104 is respectively connected with one end of the resistor R121 and one end of the resistor R122; the other end of R122 is connected with one end of a diac of the optocoupler U107, and the other end of the diac is connected with a control electrode of T103; the positive input end of the optocoupler U107 is connected with one end of a resistor R123, and the other end of the resistor R123 is connected with a power supply VCC; the negative input end of the U107 is connected with the main control module.
Rectifying and stabilizing part: the other parallel end of the resistor R101, the capacitor C102 and the capacitor C101 which are connected in parallel is connected with one input end of a rectifier bridge consisting of D101, D102, D103 and D104; the other input end of the rectifier bridge is connected with the 1 pin of the J101 (the other phase of the alternating current input); the negative output end of the rectifier bridge is grounded, the positive output end of the rectifier bridge is connected with one end of a current limiting resistor R102, and the other end of the R102 is the positive electrode of a power supply of the rectifying and voltage stabilizing part; (between the positive and negative poles of the power supply of the rectification and voltage stabilization part, and connected with a filter capacitor C103 and a transient voltage suppression diode D105; the positive pole of the C103 is connected with the positive pole of the power supply of the rectification and voltage stabilization part, and the negative pole of the C103 is connected with the negative pole of the power supply of the rectification and voltage stabilization part; the positive electrode of the D105 is grounded, and the negative electrode of the D105 is connected with the positive electrode of the power supply of the rectification voltage stabilizing part; (a voltage stabilizing circuit consisting of T101, T102, RW101, R103 and R104 is also connected between the positive electrode and the negative electrode of the power supply of the rectification voltage stabilizing part; the emitter of the triode T101 is connected with the positive electrode of the power supply of the rectification voltage stabilizing part, the collector of the triode T101 is connected with the negative electrode of the power supply of the rectification voltage stabilizing part, the resistor R103 is connected with the voltage stabilizing diode T102 in series, and the base of the triode T101 is connected with a voltage dividing point after the resistor R103 is connected with the voltage stabilizing diode T102 in series): the base electrode of the T101 is respectively connected with one end of the R103 and the cathode of the T102, the other end of the R103 is connected with the positive electrode of the power supply of the rectifying and voltage stabilizing part, and the anode of the T102 is grounded; one end of the adjustable resistor RW101 is connected with one end of the resistor R104, the adjusting end of the T102 is connected with a series voltage division point after the series voltage division of the adjustable resistor RW101 and the R104, the other end of the R104 is grounded, and the other end of the RW101 is connected with the positive electrode of the power supply of the rectifying and voltage stabilizing part.
A trigger signal forming section: comprises 6 zero-crossing optocouplers: the input ends of the 6 zero-crossing optocouplers are connected in series, the 1 pin of the U101 is connected with the positive electrode of a power supply of the rectifying and voltage-stabilizing part through a resistor R105, the 2 pin of the U101 is connected with the 1 pin of the U102, the 2 pin of the U102 is connected with the 1 pin of the U103, the 2 pin of the U103 is connected with the 1 pin of the U104, the 2 pin of the U104 is connected with the 1 pin of the U105, the 2 pin of the U105 is connected with the 1 pin of the U106, and the 2 pin of the U106 is connected with the ground of the rectifying and voltage-stabilizing part; the output ends of the 6 zero-crossing optocouplers output a group of signals in series every 2, and the output ends of the U101 and the U102 are connected in series through a resistor R108: the 4 pin of U101 is connected with the 6 pin of U102 through R108; the outputs of U103 and U104 are connected in series by resistor R113: the 4 pin of U103 is connected with the 6 pin of U104 through R113; the outputs of U105 and U106 are connected in series by resistor R118: the 4 pin of U105 is connected with the 6 pin of U106 through R118; a voltage equalizing resistor is connected between the pins 4 and 6 of the output end of the zero-crossing optocoupler in parallel; the equalizing resistors are R106, R109, R111, R114, R116 and R119; the 6 zero-crossing optocouplers are divided into 3 groups of optocouplers for output, and the output ends of the 3 groups of optocouplers are: 6 feet of U101 and 4 feet of U102, 6 feet of U103 and 4 feet of U104, 6 feet of U105 and 4 feet of U102; the output ends of the 3 groups of optocouplers are respectively connected with parallel ends of diodes and resistors which are connected in parallel; the 6 pin of U101 is connected with the parallel end formed by parallel connection of diode D109 and resistor R107, the 4 pin of U102 is connected with resistor R110 in parallel connection of diode D110, the 6 pin of U103 is connected with the parallel end formed by parallel connection of diode D111 and resistor R112, the 6 pin of U104 is connected with the parallel end formed by parallel connection of diode D112 and resistor R115, the 6 pin of U105 is connected with the parallel end formed by parallel connection of diode D113 and resistor R117, and the 4 pin of U106 is connected with the parallel end formed by parallel connection of diode D114 and resistor R120. The cathodes of the diodes D109, D110, D111, D112, D113 and D114 are connected with the 4 pin or the 6 pin of the optocoupler, and trigger signals are respectively output from two parallel ends of each group.
As another preferred aspect of the present invention, the power-on power detection circuit includes: one phase of alternating voltage input from the plug-in J001 is reduced in voltage through a capacitor C001 and then is connected with one input end of a rectifier bridge formed by diodes D001, D002, D003 and D004, the other phase of alternating voltage is connected with the other input end of the rectifier bridge, and two ends of the C001 are connected with a bleeder resistor R001 in parallel; the negative output end of the rectifier bridge is grounded, the positive output end of the rectifier bridge is connected with one end of a current limiting resistor R002, and the other end of the current limiting resistor R002 is the positive electrode of the power supply; a filter capacitor C003 and a transient voltage suppression diode D007 are also connected in parallel between the positive electrode and the negative electrode of the power supply, (the positive electrode of the C003 is connected with the positive electrode of the power supply, the negative electrode of the C003 is connected with the negative electrode of the power supply, the positive electrode of the D007 is grounded, the negative electrode of the D007 is connected with the positive electrode of the power supply), and a voltage stabilizing circuit consisting of a triode T001, a voltage stabilizing tube T002, a resistor R003, a resistor R004 and a resistor R005 is also connected between the positive electrode and the negative electrode of the power supply; (the emitter of T001 is connected with the positive pole of the power supply, the collector is connected with the negative pole of the power supply, the base is connected with the voltage division point after R003 and T002 are connected in series, namely, the base of T001 is respectively connected with one end of R003 and the cathode of T002, the other end of R003 is connected with the positive pole of the power supply, the anode of T002 is grounded, the adjusting end of T002 is connected with the voltage division point after R004 and R005 are connected in series), a delay circuit consisting of a diode D008, a resistor R006, a capacitor C004, a triode T003 and a resistor R007 is also connected between the positive pole and the negative pole of the power supply, the output of the delay circuit is connected with the master control module (the D008 is connected with the R006 in parallel and then is connected with the C004 in series, the positive pole and the negative pole of the power supply are connected with the ground, the common point after being connected with the negative pole of the C004 is connected with the base of the T003, the emitter of the T003 is grounded, the collector of the T003 is connected with the positive pole of the power supply through a load resistor R).
Compared with the prior art, the invention has the beneficial effects.
The invention can be used for replacing the traditional alternating current contactor, and the geometric dimension, particularly the installation dimension, of the invention is the same as that of the alternating current contactor, and a modularized structure is adopted.
The invention has the same function as the traditional AC contactor, and the auxiliary contact can be used for controlling the motor, realizing interlocking when the motor rotates positively and negatively, and also can be used for other control occasions. Particularly, the auxiliary contact has the same function as that of the auxiliary contact which can not be reset when the main contact of the traditional alternating current contactor is stuck, so that the control loop can be cut off once the main contact is stuck (the main loop thyristor is penetrated) and other parts are prevented from being damaged due to interphase short circuit of the main loop when the main loop is in error commutation.
The invention has the phase-failure protection function, and the traditional phase-failure protection circuit generates great heat due to the adoption of the high-power resistor for on-line detection, thereby not only wasting electric energy, but also reducing the reliability of equipment. The complex phase-failure protection circuit is complicated, low in reliability and high in implementation difficulty. The invention is improved on the basis of the traditional phase-failure protection circuit, has simple circuit structure and ideal effect, and the improved phase-failure circuit does not generate heat or waste electric energy, and is simple, reliable and easy to implement.
The invention has no noise and spark during operation, adopts zero-crossing triggering, prolongs the service life of the switch, reduces the impact of high current on the motor during starting, and is suitable for controlling the occasion of frequent starting and frequent forward/reverse switching of the motor.
The invention also provides a starting power supply detection circuit and an over-temperature and over-temperature control circuit, wherein the starting power supply detection circuit is as follows: the power supply is provided for the related circuit, the standby power supply is provided for the normally open and normally closed contact circuit, and the standby power supply is controlled by the main control module and is switched to when breakdown or phase failure occurs. The over-temperature overheat control circuit informs the main control module to start the fan for cooling when the over-temperature is exceeded, and informs the main control module to disconnect the trigger loop when the over-temperature is exceeded, so as to realize overheat protection on the AC switch.
Drawings
The invention is further described below with reference to the drawings and the detailed description. The scope of the present invention is not limited to the following description.
Fig. 1 is a schematic diagram of the structure of the present invention.
Fig. 2 is a circuit diagram of the main loop of the present invention.
FIG. 3 is a circuit diagram of a power-on power detection circuit of the present invention.
Fig. 4 is a circuit diagram of a master control module according to the present invention.
Fig. 5 is a circuit diagram of the trigger circuit of the present invention.
Fig. 6 is a circuit diagram of the phase failure detection circuit of the present invention.
FIG. 7 is a circuit diagram of the over-temperature and over-temperature control of the present invention.
Fig. 8 is a circuit diagram of the normally open normally closed contact output of the present invention.
Fig. 9 is a functional block diagram of the present invention.
In the figure, 1 is a status indicator lamp, 2 is a wiring terminal, 3 is a thyristor chip, 4 is a main control board, 5 is a three-phase output wiring terminal, 6 is a radiator, and 7 is a three-phase input wiring terminal.
Detailed Description
As shown in FIG. 9, the invention comprises a main control module, an overheat control circuit, a startup power supply detection circuit, a phase failure breakdown detection circuit, a trigger circuit, a normally open normally closed contact output circuit and a main loop.
The main control module is respectively connected with the trigger circuit, the overheat control circuit, the startup power supply detection circuit and the open-phase breakdown detection circuit.
The starting power supply detection circuit is respectively connected with the overheat control circuit and the normally open and normally closed contact output circuit; the power supply is provided for the overheat control circuit, the standby power supply is provided for the normally open normally closed contact circuit, and the normally open normally closed contact circuit is switched to the power supply when breakdown or phase failure occurs under the control of the main control module.
The trigger circuit is respectively connected with a normally open and normally closed contact circuit (sending a trigger signal and enabling a normally open and normally closed contact output circuit to act) and a main loop (sending the trigger signal to the main loop and conducting a thyristor).
The trigger circuit receives a control signal from an external host.
The working principle and connection of each circuit and module.
Main loop: according to different current capacities, thyristors of different specifications are selected to be connected in anti-parallel to replace mechanical contacts of a traditional alternating current contactor, and the conduction of the thyristors K001-K006 is controlled in a zero-crossing triggering mode, so that the impact of high current on a motor during starting is greatly reduced, and the service life of the motor is prolonged. The thyristor is on without noise and spark, so the switch has long service life and wide application range. The main loop circuit is shown in fig. 2.
And the main control module: a simple and reliable singlechip is adopted as a main control MCU of a main control module to monitor the states of all units; and a trigger signal is sent out in normal time, so that the main loop thyristor is conducted, and the normally open and normally closed contact output circuit acts at the same time, thereby being convenient for realizing interlocking or other occasions needing control when controlling the forward and reverse rotation of the motor. And once the fault occurs, the trigger circuit is immediately cut off to disconnect the main circuit thyristor, and meanwhile, the normally open and normally closed contact output circuit is continuously operated, so that other components are prevented from being damaged due to interphase short circuit during error commutation. The main control module is shown in fig. 4. After the MCU is powered on, the state of the relevant IO port is read, if the state is normal, the P5.4 of the MCU sends out a signal to enable the bidirectional thyristor T103 in the trigger circuit of FIG. 5 to be conducted, and thus, the external control signal can control the on-off of the main loop at any time. The MCU immediately sends out a signal to cut off the triac T103 to cut off the trigger circuit once detecting the abnormal state, thereby cutting off the main circuit.
Normally open and normally closed contact output circuit: normally open and normally closed contacts are output with a high sensitivity relay which will be controlled as follows. The normally open and normally closed contacts are attracted when the main loop is conducted, so that the motor can be interlocked when the motor is switched in forward and reverse directions. The normally open and normally closed contacts are sucked and disconnected to trigger the loop when the phase is lost, so that the output end is rapidly cut off, and the motor is prevented from being burnt out due to the phase loss operation. The normally open and normally closed contacts are attracted when the thyristor breaks down, so that the situation that the thyristor cannot commutate when in failure is ensured, and the phenomenon that other components are damaged due to interphase short circuit when in error commutation is avoided. The design fundamentally ensures that the function of the auxiliary contact is completely consistent with that of the traditional alternating current contactor, so that the auxiliary contact can be exchanged with the traditional alternating current contactor in any occasion. The normally open and normally closed contact output circuit is shown in fig. 8. A triode is used as a switching tube to control the power supply or the power failure of a relay coil connected with the triode, so that auxiliary contacts of the relay are closed and opened; the auxiliary contact of the relay is used as a normally open and normally closed contact of the design; the singlechip controls the saturated conduction of the triode T004 in the normally-open normally-closed contact output circuit, so that the normally-open normally-closed contact output circuit acts. An isolation optocoupler is connected between the singlechip and the triode, so that isolation between the singlechip side and the normally-open normally-closed contact side is realized, and interference to the singlechip is prevented. Specifically, the positive input end of the optocoupler U001 is connected with the positive electrode of the power supply through a resistor R008, the negative input end of the optocoupler U001 is connected with the I/O port of the singlechip, the collector output end of the optocoupler U001 is connected with the collector of the triode T004, the base of the T004 is connected with the emitter output end of the U001 through a resistor R009, the collector of the T004 is also connected with the positive electrode of the power supply, and the emitter of the T004 is respectively connected with the negative electrode of the diode D107, one end of the coil of the relay JDQ101 and one end of the coil of the relay JDQ102, and the positive electrode of the diode D107, the other end of the coil of the relay JDQ101 and the other end of the coil of the relay JDQ102 are connected with the ground.
The power-on power supply detection circuit comprises: in order to ensure that the power cannot be turned on when the fault exists and to provide power for other related circuits, a power-on power detection circuit is provided, as shown in fig. 3. The input end of the three-phase alternating current contactless switch is electrified after the front-stage power transmission, and the power supply detection circuit starts to work. The alternating current is rectified by a rectifier bridge consisting of diodes D001, D002, D003 and D004 through the step-down of C001, and is supplied with power for a main control module and an overheat control circuit after being subjected to voltage stabilizing C003 filtering by a voltage stabilizing circuit consisting of T001, T002, R003, R004, R005 and D007, and a standby power supply is provided for a normally-open normally-closed contact output circuit. Meanwhile, the triode T003 in the delay circuit is conducted in an electric saturation mode, the P1.0 port of the main control module is set low, and the main control module is informed of normal power supply.
The working principle of the voltage stabilizing circuit is as follows: the transient voltage suppression diode D007 absorbs transient overvoltage, stabilizes output voltage within a certain range, and then a resistor R004 and a resistor R005 are connected in series to form a first voltage dividing circuit, the first voltage dividing point is connected with the adjusting end of the low-power voltage stabilizing tube T002, the T002 and the resistor R003 are connected in series to form a second voltage dividing circuit, and the second voltage dividing point is connected with the base electrode of the triode T001. If the output voltage increases, the voltage of the first voltage division point increases, the voltage of the adjusting terminal of T002 increases, the voltage of the cathode of T002 decreases, the voltage of the second voltage division point decreases, the bias voltage between E, B of T001 increases, and the conduction degree of T001 increases, so that the output voltage is lowered. Otherwise, the conduction degree of the T001 is reduced, and the output voltage is increased, so that the output voltage is effectively stabilized. The purpose of increasing T001 is to increase the regulated power, and the circuit can work without adding T001, but T002 is too hot, and the problem of heat is thoroughly solved after increasing T001, so that the reliability of the circuit is improved. After stable voltage is formed, the triode T003 in the delay circuit consisting of D008, R006, C004, R007 and T003 can be saturated and conducted, the P1.0 of the MCU is set low, the program of the MCU can be regulated to carry out the next step of program only if the P1.0 is set low, that is, only the part of power supply can work normally and can be carried out downwards, and the detection of the power supply can be realized.
Phase failure breakdown detection circuit: the circuit is shown in fig. 6, the resistor in the traditional open-phase protection circuit is replaced by a capacitor, namely, the C201, the C202 and the C203 replace the original high-power resistor, so that the generation of heat is fundamentally avoided, the electric energy is saved, the reliability of the equipment is improved, and meanwhile, the possibility is provided for the protection during the breakdown of the thyristor. The working principle of the phase failure and breakdown detection circuit is as follows: signals are obtained from three-phase output ends through C201, C202 and C203 respectively, if three phases are balanced, three-phase junction points, namely, a common point connected by C201, C202 and C203 and a zero line N have no potential difference, and a subsequent circuit does not act. When a phase failure or breakdown occurs, a larger potential difference (voltage) exists between the three-phase junction and N immediately due to three-phase unbalance, the voltage is rectified by a bridge rectifying circuit formed by D201, D202, D203 and D204, then a stable direct-current voltage is obtained after the voltage is stabilized by a voltage stabilizing circuit formed by R204, T201, T202, R205, R207, R208 and D208 (the working principle of a voltage stabilizing part is that a power-on power supply detection part is seen) and is filtered by a C204, the voltage can enable T203 in a delay circuit formed by D207, R210, C205, T203 and R211 to be saturated and conducted, P1.1 is immediately set to be low once T203 is notified that the MCU is likely to have breakdown or phase failure, the MCU is cut off after the MCU is delayed to remove the shake, then the output of a main circuit is cut off, if the P1.1 is continuously set to be low, and otherwise, the phase failure is judged to occur.
The trigger circuit: the trigger loop is formed by adopting 6 optocouplers MOC3083 with zero-crossing trigger functions, and a specific circuit is shown in fig. 5. After detecting that the states of all IO ports are normal, the main control MCU sends out signals from the P5.4 port to trigger and conduct T103, and a passage is formed for external control signals. The externally input alternating current control signal is reduced in voltage through capacitors C101 and C102, then rectified by a rectifier bridge formed by D101, D102, D103 and D104, a voltage stabilizing circuit formed by T101, T102, R103, R104, RW101 and D105 is used for stabilizing voltage, a stable direct current voltage is obtained after the C103 is filtered, a power supply is provided for a trigger loop formed by six optocouplers of U101-U106 in series, and as long as the power supply exists, the U101-U106 is conducted to send out a trigger signal, and 6 thyristors K001-K006 of the main loop are triggered to be conducted. Once the phase loss, breakdown or other faults occur, the MCU immediately turns off the T103 to cut off the power supply of the trigger circuit and further turns off the six thyristors of the main circuit.
An over-temperature and over-temperature control circuit: the power device workpiece must generate heat, and an over-temperature and over-temperature control circuit is arranged for the heat generation, and the specific circuit is shown in fig. 7. After the power-on, the overheat control circuit enters a monitoring state. The state of the dual voltage comparator U401 (chip LM 393) is controlled using two negative temperature coefficient thermistors R404, R408 in close contact with the heat sink as the overheat and overheat detection sensors. The pins 1, 2 and 3 of the U401 form a voltage comparator V1, the pins 5, 6 and 7 of the U401 form a voltage comparator V2, when the resistance of the over-temperature detection thermistor R408 is reduced to a set resistance, the state of the dual-voltage comparator V1 is turned over, the pin 1 of the U401 is changed from high to low, the P1.2 port of the MCU connected with the U401 is also set low, at the moment, the MCU sets the P1.4 port low to enable the U402 to be conducted and send a trigger signal, the triac T401 is enabled to be conducted, and a fan inserted in the J403 is turned on to cool the system. If the resistance of the overheat detection thermistor R404 is reduced to the set value after the temperature continues to rise, the state of the dual-voltage comparator V2 is turned over, the pin 7 of the U401 is changed from high to low, the P1.3 port of the MCU connected with the pin 7 is also set low, and at the moment, the MCU immediately cuts off the T103 interrupt trigger signal in the trigger loop to forcedly withdraw the main loop.
The detailed working process of each circuit and each module is as follows:
1. the input end of the three-phase alternating current contactless switch is electrified after the front-stage power transmission, the starting power supply detection circuit shown in fig. 3 starts to work, the alternating current is rectified and stabilized to transmit power to the MCU and the overheat control circuit, and a standby power supply is provided for the normally-open normally-closed contact output circuit. And meanwhile, the T003 is conducted in an electric saturation mode, the P1.0 port of the MCU is set low, and the MCU is informed of normal power supply.
2. And after the MCU is powered on, the state of the relevant IO port is read, and if the P5.4 of the MCU with normal state sends out a signal to enable the T103 bidirectional thyristor in the trigger circuit of FIG. 5 to be conducted, the external control signal can control the on-off of the main loop at any time. The MCU immediately sends out a signal to cut off the T103 open trigger loop once it detects an abnormal state, thereby cutting off the main loop.
3. After the trigger loop shown in fig. 5 receives an external control signal, if the MCU has triggered T103 to conduct, the externally input ac voltage will make the optocoupler with zero-crossing trigger function conduct to send out the trigger signal after rectification and voltage stabilization, so as to conduct the thyristors in the main loop. And at the same time, the normally open and normally closed contact output circuit shown in fig. 8 is enabled to operate. The zero-crossing optocoupler has the characteristic that a trigger signal can be sent out only when the zero-crossing point is nearby, so that the current in the main loop can be increased from the zero-crossing point, and the load current has a buffering process from small to large, so that the impact of large current on the load is avoided. If the MCU detects an abnormal state, it immediately turns off T103 to interrupt the external control signal.
4. The phase-failure breakdown detection circuit shown in fig. 6 is connected to the output end of the three-phase contactless switch, when the output three-phase voltages a ', B ', and C ' are normal, the three-phase balance points, i.e. the intersection points of C201, C202, and C203, and the zero line have no potential difference, so that the circuit does not act, once the phase failure or breakdown occurs, a larger potential difference is generated between the three-phase balance points and the zero line, the voltage is rectified and stabilized to make the triode T203 saturated and conducted, the P1.1 port of the MCU is set low, and the MCU is notified that the phase failure or breakdown fault occurs. If the P1.1 port is set low in a short time, the network voltage jitter factor is removed after the delay is increased, and then the phase failure is judged to occur. If the P1.2 port is set low for a long time, breakdown fault is judged to occur. Whether the phase failure or breakdown failure occurs, the MCU sends a command to cut off T103 in the trigger loop in FIG. 5, interrupt an external control signal, and simultaneously make T004 in the normally open normally closed contact output circuit shown in FIG. 8 saturated and conductive, so that the normally open normally closed contact output circuit acts.
5. The overheat control circuit shown in fig. 7 enters a monitoring state as soon as the power is turned on. And when the overheat detection thermistor reaches a set resistance value, the state of the voltage comparator V1 is turned over, and the MCU is informed to start a fan to cool the system. If the temperature continues to rise to reach the overheat state, the state of the voltage comparator V2 can be overturned, and the MCU is informed to cut off the trigger loop, so that the main loop is forcedly withdrawn.
The invention can be used for replacing the traditional alternating current contactor, and the geometric dimension, particularly the installation dimension, of the invention is the same as that of the traditional alternating current contactor, and a modularized structure is adopted. The structure of the invention is shown in figure 1, and the data for comparing the installation size of the three-phase alternating current contactor with the installation size of the ABB three-phase alternating current contactor are shown in table 1. As shown in fig. 1, the invention corresponds to a traditional alternating current contactor and comprises a shell, wherein a three-phase input wiring terminal 7, a control power supply, a normally closed normally open contact wiring terminal 2, a three-phase output wiring terminal 5 and a status indicator lamp 1 are arranged on the shell. Be provided with main control panel 4 and radiator 6 in the casing, each circuit and the module of this design all set up on this main control panel 4, and thyristor chip 3 on the main control board 4 is fixed in on the radiator 6 through screw spring clamp plate detachable. As shown in table 1, the a, b, c, d size of the present invention is compared with the ABB three-phase ac contactor mounting size in table 1 as follows.
Table 1. Comparison of the installed dimensions with ABB three-phase ac contactor.
In summary, the three-phase ac contactless switch produced by the invention has all functions of the conventional ac contactor, so that the three-phase ac contactless switch can completely replace the conventional ac contactor. In addition, the device has the advantages of no noise and no spark during operation, relatively perfect protection function, long service life and low cost, thus having very wide application prospect.
It should be understood that the foregoing detailed description of the present invention is provided for illustration only and is not limited to the technical solutions described in the embodiments of the present invention, and those skilled in the art should understand that the present invention may be modified or substituted for the same technical effects; as long as the use requirement is met, the invention is within the protection scope of the invention.
Claims (1)
1. The three-phase contactless AC switch capable of replacing an AC contactor is characterized by comprising a main control module, an over-temperature and over-temperature control circuit, a starting power supply detection circuit, a phase failure breakdown detection circuit, a trigger circuit, a normally-open and normally-closed contact output circuit and a main loop;
the main control module is respectively connected with the trigger circuit, the overheat control circuit, the startup power supply detection circuit and the phase-failure breakdown detection circuit;
the starting power supply detection circuit is respectively connected with the overheat control circuit and the normally open and normally closed contact output circuit;
the trigger circuit is respectively connected with the normally open normally closed contact circuit and the main loop;
the trigger circuit also receives an external control signal;
the main loop comprises a thyristor;
the master control module collects a singlechip and a minimum system thereof;
the singlechip is an STC15W204S singlechip of macro-crystal technology Co-Ltd;
the normally open normally closed contact output circuit comprises an optocoupler U001, wherein the positive electrode of a light emitting diode in the optocoupler U001 is connected with the positive electrode of a power supply through a resistor R008, the negative electrode of the light emitting diode in the optocoupler U001 is connected with an I/O port of a main control module, the collector output end of the optocoupler U001 is connected with the collector of a triode T004, the base electrode of the T004 is connected with the emitter output end of the U001 through a resistor R009, the collector of the T004 is also connected with the positive electrode of the power supply, the emitter of the T004 is respectively connected with the negative electrode of a diode D107, one end of a coil of a relay JDQ101 and one end of a coil of a relay JDQ102, and the positive electrode of the diode D107, the other end of the coil of the relay JDQ101 and the other end of the coil of the relay JDQ102 are connected with the ground;
the phase-failure breakdown detection circuit includes: one end of the resistor R201 is connected with the capacitor C201 in parallel and then connected with the A ' of the three-phase output end, one end of the resistor R202 is connected with the capacitor C202 in parallel and then connected with the B ' of the three-phase output end, one end of the resistor R203 is connected with the capacitor C203 in parallel and then connected with the C ' of the three-phase output end, and the other ends of the three-way resistors are converged to one point and then connected with one input end of a rectifier bridge formed by the diodes D201, D202, D203 and D204; the other input end of the rectifier bridge is connected with a zero line; the positive electrode of the output end of the rectifier bridge is connected with one end of a current limiting resistor R204, and the other end of the R204 is the positive electrode of a power supply; the negative electrode of the output end of the rectifier bridge is grounded; a filter capacitor C204 and a transient voltage suppression diode D208 are also connected between the anode and the cathode of the power supply; wherein the positive electrode of C204 is connected with the positive electrode of the power supply and one end of R204, and the negative electrode of C204 is connected with the ground; the negative electrode of the D208 is connected with the positive electrode of the power supply, and the positive electrode of the D208 is connected with the ground; the output end of the power supply is also connected with a voltage stabilizing circuit consisting of a PNP tube T201, a voltage stabilizing diode T202, a resistor R205, a resistor R207 and a resistor R208; the collector of T201 is grounded, the emitter is connected with the positive electrode of the power supply, R205 is connected with T202 in series, and the base is connected with the voltage division point after R205 is connected with T202 in series: the base electrode is respectively connected with one end of R205 and the cathode of T202, the other end of R205 is connected with the positive electrode of the power supply, and the anode of T202 is grounded; the adjusting end of T202 is connected with the serial partial pressure points of R207 and R208; the power supply output end is also connected with a delay circuit consisting of a diode D207, a resistor R210, an electrolytic capacitor C205, a triode T203 and a resistor R211, wherein the R210 and the D207 are connected in parallel and then connected with the positive electrode of the C205 in series, and the common point after the connection is connected with the base electrode of the T203; the negative electrode of D207 is connected with the positive electrode of the power supply, and the negative electrode of C205 is grounded; the emitter of the T203 is grounded, the collector of the T203 is connected with the positive electrode of the power supply through a load resistor R211, and the collector of the T203 is also connected with the main control module;
the overheat control circuit comprises: the device comprises an over-temperature overheat detection part consisting of a dual-voltage comparator U401 and an affiliated element, and an over-temperature cooling power supply part consisting of an optocoupler U402, a bidirectional thyristor T401 and the affiliated element;
an overheat detection section: the dual-voltage comparator U401 adopts a chip LM393, the 4 pins of the U401 are grounded, and the 8 pins are connected with a power supply VCC; the 1, 2 and 3 pins of the U401 form a voltage comparator V1, the 1 pin of the U401 is an output end of the V1, the 1 pin of the U401 is connected with a main control module, and a resistor R409 is connected between the 1 pin of the U401 and VCC in parallel; the 2 pin of the U401 is connected with the voltage division point of the adjustable resistor RW401, the resistor R401 and the resistor R402 after being connected in series, one end of the RW401 is connected with the power VCC after being connected in series with the R401, the other end of the RW401 is respectively connected with one end of the R402 and the 2 pin of the U401, and the other end of the R402 is grounded; one end of a resistor R403 is connected with one end of a thermistor R404, a 3-pin of the U401 is connected with a voltage division point which is connected in series through the resistor R403 and the thermistor R404, the other end of the R403 is connected with a power supply VCC, and the other end of the R404 is grounded; the pins 5, 6 and 7 of the U401 form a voltage comparator V2, and the pin 7 of the U401 is an output end of the V2 and is connected with the main control module; the pin 7 of the U401 is also connected with one end of a resistor R410, and the other end of the R410 is connected with a power supply VCC; the 6 pins of the U401 are connected with the voltage division point after the adjustable resistor RW402, the resistor R405 and the resistor R406 are connected in series: one end of RW402 is connected with one end of R405, the other end of RW402 is connected with power VCC, the other end of R405 is respectively connected with one end of R406 and pin 6 of U401, and the other end of R406 is grounded; one end of a resistor R407 is connected with one end of a thermistor R408, a 5-pin of a U401 is connected with a voltage division point which is connected with the thermistor R408 in series through the R407, the other end of the R407 is connected with a power supply VCC, and the other end of the R408 is grounded;
an over-temperature cooling power supply part: the end T1 of the bidirectional thyristor T401 is respectively connected with an alternating current input and a resistor R411, the other end T2 of the T401 is respectively connected with an output socket J403 and one end of a capacitor C401, the other end of the C401 is respectively connected with one end of the R411 and one end of the R412, the other end of the R412 is connected with one end of a bidirectional trigger diode of the optocoupler U402, and the other end of the bidirectional trigger diode is connected with a control electrode of the T401; the positive input end of the U402 is connected with one end of a resistor R413, the other end of the resistor R413 is connected with a power supply VCC, and the negative input end of the U402 is connected with a main control module;
the trigger circuit includes: an externally input alternating current signal control part, a rectifying and voltage stabilizing part and a trigger signal forming part;
an externally input ac signal control section: the end T1 of the bidirectional thyristor T103 is respectively connected with the pin 2 of the input alternating current signal plug-in J101 and the resistor R121, the resistor R101, the capacitor C102 and the capacitor C101 are connected in parallel, the other end T2 of the T103 is connected with a parallel end of the C101, the C102 and the R101 after being connected in parallel, the other end T2 of the T103 is also connected with one end of the capacitor C104, and the other end of the C104 is respectively connected with one end of the resistor R121 and one end of the resistor R122; the other end of R122 is connected with one end of a diac of the optocoupler U107, and the other end of the diac is connected with a control electrode of T103; the positive input end of the optocoupler U107 is connected with one end of a resistor R123, and the other end of the resistor R123 is connected with a power supply VCC; the negative input end of the U107 is connected with the main control module;
rectifying and stabilizing part: the other parallel end of the resistor R101, the capacitor C102 and the capacitor C101 which are connected in parallel is connected with one input end of a rectifier bridge consisting of D101, D102, D103 and D104; the other input end of the rectifier bridge is connected with the 1 pin of the J101; the negative output end of the rectifier bridge is grounded, the positive output end of the rectifier bridge is connected with one end of a current limiting resistor R102, and the other end of the R102 is the positive electrode of a power supply of the rectifying and voltage stabilizing part; the positive electrode of the C103 is connected with the positive electrode of the power supply of the rectification voltage-stabilizing part, and the negative electrode of the C103 is connected with the negative electrode of the power supply of the rectification voltage-stabilizing part; the positive electrode of the D105 is grounded, and the negative electrode of the D105 is connected with the positive electrode of the power supply of the rectification voltage stabilizing part; the emitter of the triode T101 is connected with the positive electrode of the power supply of the rectifying and voltage-stabilizing part, the collector of the triode T101 is connected with the negative electrode of the power supply of the rectifying and voltage-stabilizing part, the resistor R103 is connected with the voltage-stabilizing diode T102 in series, and the base of the triode T101 is connected with the voltage-dividing point after the resistor R103 is connected with the voltage-stabilizing diode T102 in series: the base electrode of the T101 is respectively connected with one end of the R103 and the cathode of the T102, the other end of the R103 is connected with the positive electrode of the power supply of the rectifying and voltage stabilizing part, and the anode of the T102 is grounded; one end of an adjustable resistor RW101 is connected with one end of a resistor R104, an adjusting end of a T102 is connected with a series voltage division point after the series voltage division of the adjustable resistor RW101 and the R104, the other end of the R104 is grounded, and the other end of the RW101 is connected with the positive electrode of a power supply of a rectifying and voltage stabilizing part;
a trigger signal forming section: comprises 6 zero-crossing optocouplers: the input ends of the 6 zero-crossing optocouplers are connected in series, the 1 pin of the U101 is connected with the positive electrode of a power supply of the rectifying and voltage-stabilizing part through a resistor R105, the 2 pin of the U101 is connected with the 1 pin of the U102, the 2 pin of the U102 is connected with the 1 pin of the U103, the 2 pin of the U103 is connected with the 1 pin of the U104, the 2 pin of the U104 is connected with the 1 pin of the U105, the 2 pin of the U105 is connected with the 1 pin of the U106, and the 2 pin of the U106 is connected with the ground of the rectifying and voltage-stabilizing part; the output ends of the 6 zero-crossing optocouplers output a group of signals in series every 2, and the output ends of the U101 and the U102 are connected in series through a resistor R108: the 4 pin of U101 is connected with the 6 pin of U102 through R108; the outputs of U103 and U104 are connected in series by resistor R113: the 4 pin of U103 is connected with the 6 pin of U104 through R113; the outputs of U105 and U106 are connected in series by resistor R118: the 4 pin of U105 is connected with the 6 pin of U106 through R118; a voltage equalizing resistor is connected between the pins 4 and 6 of the output end of the zero-crossing optocoupler in parallel; the equalizing resistors are R106, R109, R111, R114, R116 and R119; the 6 zero-crossing optocouplers are divided into 3 groups of optocouplers for output, and the output ends of the 3 groups of optocouplers are: 6 feet of U101 and 4 feet of U102, 6 feet of U103 and 4 feet of U104, 6 feet of U105 and 4 feet of U102; the output ends of the 3 groups of optocouplers are respectively connected with parallel ends of diodes and resistors which are connected in parallel; the pin 6 of the U101 is connected with a parallel end formed by connecting a diode D109 and a resistor R107 in parallel, the pin 4 of the U102 is connected with the resistor R110 in parallel by connecting a diode D110, the pin 6 of the U103 is connected with a parallel end formed by connecting a diode D111 and a resistor R112 in parallel, the pin 6 of the U104 is connected with a parallel end formed by connecting a diode D112 and a resistor R115 in parallel, the pin 6 of the U105 is connected with a parallel end formed by connecting a diode D113 and a resistor R117 in parallel, and the pin 4 of the U106 is connected with a parallel end formed by connecting a diode D114 and a resistor R120 in parallel;
the power-on power supply detection circuit comprises: one phase of alternating voltage input from the plug-in J001 is reduced in voltage through a capacitor C001 and then is connected with one input end of a rectifier bridge formed by diodes D001, D002, D003 and D004, the other phase of alternating voltage is connected with the other input end of the rectifier bridge, and two ends of the C001 are connected with a bleeder resistor R001 in parallel; the negative output end of the rectifier bridge is grounded, the positive output end of the rectifier bridge is connected with one end of a current limiting resistor R002, and the other end of the current limiting resistor R002 is the positive electrode of the power supply; a filter capacitor C003 and a transient voltage suppression diode D007 are also connected in parallel between the positive electrode and the negative electrode of the power supply, and a voltage stabilizing circuit consisting of a triode T001, a voltage stabilizing tube T002, a resistor R003, a resistor R004 and a resistor R005 is also connected between the positive electrode and the negative electrode of the power supply; and a delay circuit consisting of a diode D008, a resistor R006, a capacitor C004, a triode T003 and a resistor R007 is also connected between the anode and the cathode of the power supply, and the output of the delay circuit is connected with the main control module.
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| CN2079378U (en) * | 1990-10-25 | 1991-06-19 | 怀善兴 | Three-phase motor phase-loss protector |
| CN2416665Y (en) * | 2000-01-10 | 2001-01-24 | 长沙市君辉实业有限公司 | Multifunctional explosion-proof and intrinsic safety power supply |
| CN2434815Y (en) * | 2000-05-17 | 2001-06-13 | 温州市松台电表仪器厂 | Solid switch |
| CN2847636Y (en) * | 2005-12-01 | 2006-12-13 | 孙启寅 | Phase-loss protector for three-phase ac motor |
| CN201204570Y (en) * | 2008-01-24 | 2009-03-04 | 上海智大电子有限公司 | AC contactless control switch |
| CN201562953U (en) * | 2009-10-19 | 2010-08-25 | 广州市圣大电子有限公司 | Temperature protection circuit with software and hardware control function |
| CN202050245U (en) * | 2011-03-11 | 2011-11-23 | 重庆瑞升康博电气有限公司 | Three-phase intelligent composite switching device |
| CN202617051U (en) * | 2012-05-29 | 2012-12-19 | 厦门金欣荣电子科技有限公司 | Improved three-phase motor positive and negative rotation controller |
| CN203826290U (en) * | 2014-04-03 | 2014-09-10 | 商晓 | Contactless contactor with auxiliary contact |
| CN206349954U (en) * | 2017-01-04 | 2017-07-21 | 李振久 | A kind of three-phase contactless alternating-current switch of alternative A.C. contactor |
-
2017
- 2017-01-04 CN CN201710003306.6A patent/CN106877772B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2079378U (en) * | 1990-10-25 | 1991-06-19 | 怀善兴 | Three-phase motor phase-loss protector |
| CN2416665Y (en) * | 2000-01-10 | 2001-01-24 | 长沙市君辉实业有限公司 | Multifunctional explosion-proof and intrinsic safety power supply |
| CN2434815Y (en) * | 2000-05-17 | 2001-06-13 | 温州市松台电表仪器厂 | Solid switch |
| CN2847636Y (en) * | 2005-12-01 | 2006-12-13 | 孙启寅 | Phase-loss protector for three-phase ac motor |
| CN201204570Y (en) * | 2008-01-24 | 2009-03-04 | 上海智大电子有限公司 | AC contactless control switch |
| CN201562953U (en) * | 2009-10-19 | 2010-08-25 | 广州市圣大电子有限公司 | Temperature protection circuit with software and hardware control function |
| CN202050245U (en) * | 2011-03-11 | 2011-11-23 | 重庆瑞升康博电气有限公司 | Three-phase intelligent composite switching device |
| CN202617051U (en) * | 2012-05-29 | 2012-12-19 | 厦门金欣荣电子科技有限公司 | Improved three-phase motor positive and negative rotation controller |
| CN203826290U (en) * | 2014-04-03 | 2014-09-10 | 商晓 | Contactless contactor with auxiliary contact |
| CN206349954U (en) * | 2017-01-04 | 2017-07-21 | 李振久 | A kind of three-phase contactless alternating-current switch of alternative A.C. contactor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106877772A (en) | 2017-06-20 |
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