WO2013159557A1 - 一种新型的针对三相交流电机运行方向控制的固态继电器及方法 - Google Patents
一种新型的针对三相交流电机运行方向控制的固态继电器及方法 Download PDFInfo
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- WO2013159557A1 WO2013159557A1 PCT/CN2013/000075 CN2013000075W WO2013159557A1 WO 2013159557 A1 WO2013159557 A1 WO 2013159557A1 CN 2013000075 W CN2013000075 W CN 2013000075W WO 2013159557 A1 WO2013159557 A1 WO 2013159557A1
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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
- H02P23/24—Controlling the direction, e.g. clockwise or counterclockwise
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/0833—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors for electric motors with control arrangements
- H02H7/0838—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors for electric motors with control arrangements with H-bridge circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/09—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against over-voltage; against reduction of voltage; against phase interruption
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
- H02H7/1222—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters responsive to abnormalities in the input circuit, e.g. transients in the DC input
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
- H02H7/1225—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters responsive to internal faults, e.g. shoot-through
Definitions
- the present invention relates to a solid state relay, and more particularly to a solid state relay and method for controlling the running direction of a three-phase alternating current motor.
- Three-phase solid state relays function as switches in the application of three-phase AC motors.
- three-phase solid state relays have two sets of power components for forward/reverse switching of three-phase AC power and three-phase AC motors.
- phase sequence of the three-phase AC motor changes due to wiring, maintenance, etc., the motor will work in the opposite direction, affecting its normal operation, and sometimes even damage the external mechanical parts of the motor;
- the current in the motor will increase sharply due to lack of phase. If the motor is working in a phase loss state for a long time, the motor will burn out and the solid state relay will be damaged due to excessive current.
- FIG. 1 shows the main block diagram of a prior art three-phase solid state relay (SSR) 50 implemented with discrete components.
- the three-phase solid state relay (SSR) 50 includes a driving module 51 and a power component module 52 connected to the driving module 51; wherein the input terminals II, 12 of the driving module 51 are connected to the control signal CS, and the control signal CS is at the input terminal II. Or 12 input DC control signals; the input terminals L1, L2, L3 of the power module 52 are connected to the three-phase power, and the output terminals U, V, W are connected to the load LOAD.
- LOAD is mainly composed of a motor.
- the working principle is as follows: When II is valid, the output terminal U is connected to the input terminal L1, the output terminal V is connected to the input terminal L2, the output terminal W is connected to the input terminal L3; when 12 is valid, the output terminal U is input The terminal L1 is turned on, the output terminal V is connected to the input terminal L3, and the output terminal W is connected to the input terminal L2. Therefore, the phase sequence of the three-phase electric current applied to the load end can be changed by controlling II and 12 to achieve the purpose of controlling the running direction of the motor.
- the power device used by the power module 52 is usually a thyristor, and the driving module 51 is generally composed of a triode, a resistor, a capacitor, and a photocoupler.
- the constant current circuit composed of a triode, a resistor, and a capacitor receives the input terminal II or 12.
- the control signal causes the LEDs in the optocoupler to illuminate, causing the output of the optocoupler to be in an on state to trigger the corresponding thyristor to conduct.
- the load current must be completely turned off when the load current is less than a certain degree. Therefore, the two sets of power components of the solid state relay may be too short during the switching, and the power components in the set are still Unconfirmed In the case of full cut-off, another set of power components has been turned on, resulting in a phase-to-phase short circuit between the three-phase solid state relays, causing equipment damage.
- an external device phase sequence protector, controller MCU
- the external device gives a solid state relay control signal to control the power component guide. Turn the time off and off to solve the above problem.
- the present invention discloses a solid state relay and method for controlling the running direction of a three-phase AC motor, which has a concentrated structure, is safe and reliable, and is low in cost.
- a novel solid state relay for three-phase alternating current motor running direction control comprising a driving module, a power component module, a phase sequence detecting module, a phase loss detecting module, an automatic phase correction and a phase loss protection logic module; the driving module and the power The component modules are connected; the power component modules are respectively connected to the three-phase power source and the three-phase load;
- phase sequence detection module the input end is connected with the three-phase power source, and the output end is connected with the automatic phase correction and the phase loss protection logic module; for detecting the phase sequence of the three-phase power supply, and providing the phase sequence signal to the automatic Phase correction and phase loss protection logic module;
- phase loss detection module the input end is connected with the three-phase power supply, and the output end is connected with the automatic phase correction and the phase loss protection logic module; and is used for detecting whether the three-phase power supply is short Phase, and provide a phase loss signal to the automatic phase correction and phase loss protection logic module;
- the automatic phase correction and phase loss protection logic module further includes:
- the signal conversion unit receives the control signal and performs level conversion on the control signal;
- the signal processing unit is connected to the signal conversion unit, and is also respectively connected to the output end of the phase sequence detection module, the output end of the phase loss detection module, and
- the driving module is connected to: processing the phase sequence signal, the phase loss signal, and the level-converted control signal, and outputting the processed control result to the driving module.
- the signal processing unit further includes: Phase loss protection subunit, automatic phase correction subunit, interlock subunit, delay subunit, first input terminal, second input terminal, third input terminal, fourth input terminal, first output terminal, second output Terminal
- the first input terminal and the second input terminal are respectively connected to the output end of the signal conversion unit;
- the third input terminal is connected to the output end of the phase loss detecting module
- the fourth input terminal is connected to the output end of the phase sequence detecting module
- the first output terminal and the second output terminal are respectively connected to the output end of the signal processing unit
- the first input terminal to the third input terminal are respectively connected to the phase loss protection subunit, the fourth input terminal is connected to the automatic phase correction subunit, and the first output terminal and the second output terminal are connected to the delay subunit;
- phase loss protection subunit, the automatic phase correction subunit, the interlock subunit, and the delay subunit are sequentially connected; or the automatic phase correction subunit, the phase loss protection subunit, the interlock subunit, and the delay subunit are connected in sequence;
- the phase loss protection sub-unit is used for the phase loss signal output according to the phase loss detection module.
- the output result is directly locked, so that the output result is invalid;
- the automatic phase-correcting sub-unit is configured to detect the phase sequence signal output by the module according to the phase sequence, and when the three-phase electrical phase sequence is changed, the input control signal is passed through the automatic phase-correcting sub-unit, and the output is reversed;
- the interlocking sub-unit when the signals output by the current primary unit to the interlocking sub-unit are the same, the output result is locked, and the output result is invalid;
- the delay subunit is configured to delay the control signal outputted to the driving module, so that the control signal is output to the driving module after the power component of the power component module is turned off.
- phase loss protection subunit further comprises:
- a first resistor is coupled to the anode of the first diode, an anode of the first diode is coupled to the first input terminal, and an anode of the first diode serves as a first output of the phase loss protection subunit ;
- a second resistor is coupled to the anode of the second diode, an anode of the second diode is coupled to the second input terminal, and an anode of the second diode is used as a second output of the phase loss protection subunit
- the cathode of the first diode is connected to the cathode of the second diode and is then connected to the third input terminal.
- the automatic phase correction subunit further comprises: a first exclusive OR logic device, a second exclusive OR logic device; any one input of the first exclusive OR logic device is connected to any input of the second exclusive OR logic device , the first mentioned above An input of the exclusive OR logic device is coupled to the fourth input terminal;
- the other input of the first XOR logic device is coupled to the first output of the phase loss protection subunit
- the other input of the second exclusive OR logic device is coupled to the second output of the phase loss protection subunit.
- the interlocking subunit further includes: a third resistor, a first capacitor, a third exclusive OR logic device, a fourth exclusive OR logic device, a first AND logic device, a second AND logic device;
- One end of the third resistor is connected to the working power source, and the other end is respectively connected to any input end of the third exclusive OR logic device, any input end of the fourth exclusive OR logic device, and any end of the first capacitor;
- the other end of the first capacitor is connected to the working ground
- the other input terminal of the third exclusive OR logic device is respectively connected to the output end of the first exclusive OR logic device, and the second input terminal of the logic device;
- An output of the third exclusive OR logic device is coupled to any one of the first and logic devices
- the other input of the fourth exclusive OR logic device is coupled to the output of the second exclusive OR logic device, the other input of the first AND logic device, respectively;
- the output of the fourth exclusive OR logic device is coupled to the other input of the second AND logic device.
- the delay subunit further comprises:
- the third diode is connected in parallel with the fourth resistor, the cathode of the third diode is connected to the output end of the first logic device, and the anode of the third diode is respectively connected to any end of the eighth resistor, and the third and the logic device are free.
- the fourth diode is connected in parallel with the fifth resistor, the cathode of the fourth diode is connected to the output end of the second logic device, and the anode of the fourth diode is respectively connected to any end of the seventh resistor, and the fourth and the logic device are free.
- the other end of the seventh resistor is connected to the anode of the second capacitor, and the cathode of the second capacitor is connected to the working ground;
- the other end of the eighth resistor is connected to the anode of the third capacitor, and the cathode of the third capacitor is connected to the working ground;
- One end of the sixth resistor is respectively connected to the other input end of the third and logic device, the other end of the fourth and logic device, and the other end of the sixth resistor is connected to the working power source;
- the third and the output of the logic device are connected to the first output terminal
- the phase sequence detecting module further includes a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, and a first a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, an eleventh diode, a twelfth diode, a thirteenth diode, a fourteenth diode, a first photocoupler;
- the first phase of the three-phase power supply is respectively connected to any one end of the fifteenth resistor and any one end of the sixth capacitor;
- the other end of the fifteenth resistor is respectively connected to any one end of the fourteenth resistor, any one of the eighteenth resistor, the anode of the eleventh diode, and the cathode of the twelfth diode;
- the other end of the sixth capacitor is connected to either end of the sixteenth resistor
- the other end of the sixteenth resistor is respectively connected to the other end of the eighteenth resistor, any one of the seventeenth resistor, the anode of the thirteenth diode, and the cathode of the fourteenth diode;
- the second phase of the three-phase power supply is connected to either end of the fifth capacitor
- the other end of the fifth capacitor is connected to the other end of the fourteenth resistor
- the third phase of the three-phase power supply is connected to the other end of the seventeenth resistor
- the anode of the first photocoupler input end light emitting diode is respectively connected to the cathode of the eleventh diode, the cathode of the thirteenth diode, or the seventh end of the seventh capacitor, and the cathode is connected to any end of the nineteenth resistor;
- the other end of the nineteenth resistor is respectively connected to the other end of the seventh capacitor, the anode of the twelfth diode, and the anode of the fourteenth diode;
- the collector of the output terminal of the first photocoupler is connected to the working power source, and the emitter is respectively connected to any end of the twentieth resistor, any end of the eighth capacitor, and the fourth input end;
- the other end of the twentieth resistor and the other end of the eighth capacitor are respectively connected to the working ground.
- the phase loss detecting module further includes: a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourth capacitor, a fifth diode, and a sixth a pole tube, a seventh diode, an eighth diode, a ninth diode, a tenth diode, a second photocoupler, a first triode, and a second triode;
- the first phase of the three-phase power source is connected to any one end of the ninth resistor; the other end of the ninth resistor is respectively connected to the anode of the fifth diode and the cathode of the eighth diode;
- the second phase of the three-phase power source is connected to any one end of the tenth resistor; the other end of the tenth resistor is respectively connected to the anode of the sixth diode and the cathode of the ninth diode;
- the third phase of the three-phase power source is connected to any one end of the eleventh resistor; the other end of the eleventh resistor is respectively connected to the anode of the seventh diode and the cathode of the tenth diode;
- the anode of the second photocoupler input terminal light emitting diode is respectively connected to the cathode of the fifth diode, the cathode of the sixth diode, the cathode of the seventh diode, and the cathode of the light emitting diode is respectively connected to the eighth diode
- the collector of the second photocoupler is connected to the working power supply, and the emitter of the output transistor is connected to any one end of the twelfth resistor and the base of the first triode;
- the first triode collector is connected to the working power source, and the emitter is connected to any end of the fourth capacitor and any one end of the thirteenth resistor; the other end of the fourth capacitor is connected to the working ground;
- the base of the second triode is connected to the other end of the thirteenth resistor, the collector is connected to the third input end, and the emitter is connected to the working ground.
- the method for controlling the running direction of a three-phase AC motor according to the above solid state relay includes the following steps:
- the three-phase power supply is connected to the phase sequence detection module, and the phase sequence detection module detects the phase sequence of the three-phase power supply, and provides a phase sequence signal to the signal processing unit of the automatic phase correction and phase loss protection logic module.
- the three-phase power supply is connected to the phase loss detection module.
- the phase loss detection module detects whether there is a phase loss in the three-phase power supply, and provides a phase loss signal to the signal processing unit of the automatic phase correction and phase loss protection logic module.
- Control signal CS input signal conversion unit the signal conversion unit processes the control signal CS and outputs it to the signal processing unit.
- the signal processing unit processes the signal transmitted by the signal conversion unit and the signal input by the phase sequence detection module and the phase loss detection module, and outputs the processed control result to the driving module.
- the drive module controls the phase sequence of the three-phase motor by controlling the power component module.
- the step S4 further includes:
- phase loss protection subunit detects according to the phase loss.
- the phase loss signal output by the module locks the output result, invalidating the control signal output;
- S42 the output signal of the phase loss protection subunit and the phase sequence signal of the phase sequence detection module are outputted to the automatic phase correction subunit.
- the automatic phase correction subunit outputs according to the phase sequence detection unit.
- the phase sequence signal causes the control signal output through the automatic phase correction sub-unit to be reversed, and finally the phase sequence of the three-phase power supply loaded into the load is unchanged;
- S43 The output signal of the automatic phase-correcting sub-unit is input to the interlocking sub-unit, and when the signals outputted by the automatic phase-correcting sub-unit to the interlocking sub-unit are the same, the interlocking sub-unit will lock the output result, so that the control signal output is invalid;
- the beneficial effects of the present invention are as follows - First, the solid state relay structure of the present invention is concentrated in function, and the self-phase correction and phase loss protection of the power supply of the three-phase motor can be realized by itself, and the external device does not need to be connected. .
- the structure for realizing automatic phase correction and phase loss protection in the solid state relay of the present invention is completely realized by discrete components, that is, hardware circuits.
- the controller MCU/DSP that may be used by external devices is eliminated, which saves costs, that is, the same function is realized at a low price.
- the two control input signals of the forward rotation and the reverse rotation are interlocked and delayed for a period of time to be supplied to the control logic, thereby solving the phase-to-phase short circuit caused by the thyristor turn-off characteristic.
- the solid state relay operates in a strong electric environment, and requires the working device to have strong anti-interference ability.
- the structure of the solid relay of the present invention is realized by a discrete component, that is, a hardware circuit, so that it has a powerful Anti-interference ability.
- the structure of the solid state relay of the present invention is realized by a discrete component, that is, a hardware circuit, which is superior to the circuit implemented by the MCU/DSP, and there is no crash phenomenon, and there is no device caused by software operation errors. Damage, or a bigger accident may be.
- the implementation circuit of the present invention is simple, safe and reliable.
- the present invention can enable the three-phase AC motor to detect the occurrence of phase loss in real time when the three-phase power source is out of phase, and cut off the input signal path to turn off the power component to prevent the motor from being burnt due to phase loss operation.
- the present invention monitors the input three-phase electrical phase sequence in real time.
- the internal control logic issues a corresponding control command to keep the phase sequence added to the motor unchanged, thereby avoiding phase sequence change.
- the direction of motor running is inconsistent with the desired direction.
- FIG. 1 is a schematic structural view of a prior art solid state relay
- FIG. 2 is a schematic view showing the structure of a solid state relay for controlling the running direction of a three-phase AC motor according to an embodiment of the present invention
- 3 is a schematic structural diagram of a signal processing unit according to an embodiment of the present invention
- 4a is a schematic diagram of a preferred circuit of a phase loss protection subunit according to an embodiment of the present invention
- 4b is a schematic diagram of a first alternative circuit of a phase loss protection subunit according to an embodiment of the present invention.
- 4c is a schematic diagram of a second alternative circuit of the phase loss protection subunit according to an embodiment of the present invention.
- 5a is a schematic diagram of a preferred circuit of an automatic phase correction subunit according to an embodiment of the present invention.
- 5b is a schematic diagram of a first alternative circuit of an automatic phase correction subunit according to an embodiment of the present invention.
- 6a is a schematic diagram of a preferred circuit of an interlocking subunit according to an embodiment of the present invention.
- 6b is a schematic diagram of a first alternative circuit of an interlocking subunit according to an embodiment of the present invention.
- 6c is a schematic diagram of a second alternative circuit of an interlocking subunit according to an embodiment of the present invention.
- FIG. 7 is a schematic circuit diagram of a delay subunit according to an embodiment of the present invention.
- FIG. 8a is a schematic circuit diagram of a phase sequence detecting module according to an embodiment of the present invention.
- FIG. 8b is a schematic diagram of a first alternative circuit of the phase sequence detecting module according to an embodiment of the present invention.
- FIG. 8c is a schematic diagram of a second alternative circuit of the phase sequence detecting module according to an embodiment of the present invention.
- 9a is a schematic circuit diagram of a phase loss detecting module according to an embodiment of the present invention.
- Figure 1 is a schematic diagram of a first alternative circuit of a phase loss detection module according to a specific embodiment of the present invention
- FIG. 10 is a flow chart of a method for controlling a running direction of a three-phase AC motor by a solid state relay according to an embodiment of the present invention.
- a novel solid state relay 10 for three-phase AC motor running direction control includes a driving module 14, a power component module 15, a phase sequence detecting module 122, a phase loss detecting module 121, automatic phase correction and phase loss protection.
- Logic module 13 power module 11.
- the drive module 14 is connected to the power component module 15; the power component module 15 is connected to the three-phase power supply 60 and the three-phase load 80, respectively.
- the power module 11 directly takes power from the control signal CS and provides a 5V power supply for the phase sequence detection module 122, the phase loss detection module 121, the automatic phase correction and phase loss protection logic module.
- the power supply connection relationship between the power module 11 and the phase sequence detection module 122, the phase loss detection module 121, the automatic phase correction and the phase loss protection logic module 13 is not shown.
- the phase sequence detecting module 122 the input end is connected to the three-phase power source 60, and the output end 14 is automatically phase-corrected and lacks phase protection.
- the protection logic module 13 is connected; is used for detecting the phase sequence of the three-phase power supply 60, and provides a phase sequence signal to the automatic phase correction and phase loss protection logic module 13.
- the phase loss detecting module 121 the input end is connected to the three-phase power source 60, and the output end 13 is connected with the automatic phase correction and phase loss protection logic module 13; for detecting whether a phase loss occurs when the three-phase power source is supplied, and providing a phase loss signal
- the automatic phase correction and phase loss protection logic module 13 is provided.
- the automatic phase correction and phase loss protection logic module 13 further includes:
- the signal conversion unit 131 has an input terminal receiving the control signal CS, and its output terminals II and 12 are respectively connected to the input end of the signal processing unit 132; for level-converting the received control signal CS; that is, a wide range of control signals Converted to high and low level signals.
- a general conversion circuit can be used here.
- the signal processing unit 132 has its input terminals connected to the output terminals II and 12 of the signal conversion unit 131, the output terminal 14 of the phase sequence detection module 122, and the output terminal 13 of the phase loss detection module 121, respectively, and the output terminals 01 and 02 thereof are respectively.
- the input terminal of the driving module 14 is connected; for processing the signal transmitted by the signal converting unit 131 and the signal transmitted by the phase sequence detecting module 122 and the phase loss detecting module 121, and outputting the processed control result to the driving module 14.
- Phase loss alarm output unit 133 Connected to the signal processing unit 132 for alarming when there is a phase loss in the three-phase power supply.
- the phase loss alarm output unit 133 may not be included in the automatic phase correction and phase loss protection logic module 13. That is, it is not the core unit of the module, so the invention is not limited herein.
- the signal processing unit 132 further includes:
- Phase loss protection subunit 21 automatic phase correction subunit 22, interlock subunit 23, delay subunit 24, first input terminal 110, second input terminal 120, third input terminal 130, fourth input terminal 140, The first output terminal 010 and the second output terminal 020.
- the first input terminal 110 and the second input terminal 120 are connected to the output terminals II and 12 of the signal conversion unit 131, respectively.
- the third input terminal 130 is connected to the output 13 of the phase loss detecting module 121.
- the fourth input terminal 140 is coupled to the output 14 of the phase sequence detection module.
- the first output terminal O10 and the second output terminal O20 are connected to the output terminals 01 and 02 of the signal processing unit, respectively.
- the first input terminal 110 to the third input terminal 130 are respectively connected to the phase loss protection subunit 21, the fourth input terminal 140 is connected to the automatic phase correction subunit 22, and the first output terminal O10 and the second output terminal O20 are extended.
- phase loss protection subunit 21, the automatic phase correction subunit 22, the interlock subunit 23, and the delay subunit 24 Connect in order.
- sequence of the phase loss protection subunit 21 and the automatic phase correction subunit 22 may be interchanged, that is, the automatic phase correction subunit 22, the phase loss protection subunit 21, the interlock subunit 23, and the delay subunit 24 are sequentially connection.
- the invention is not limited thereto.
- Phase loss protection sub-unit 21 When the three-phase power supply supplies power to the power component module, and at least one phase power supply connection is disconnected, the sub-unit directly locks the output result according to the phase loss signal output by the phase loss detection module, so that the output is output. The control signal to the drive module 14 is invalid.
- the automatic phase-correcting sub-unit 22 when the three-phase power supply supplies power to the power component module, and any two of them are connected to each other, the input phase sequence of the three-phase power will be changed. At this time, the automatic phase-correcting sub-unit 22 will be based on the phase sequence.
- the phase sequence signal output by the detecting module 121 is opposite to the input control signal, that is, if the input control signal is high/low level, the output of the automatic phase correction sub-unit 22 is low/high level, and finally the three-phase is finally made.
- the phase sequence of the power supply loaded into the load does not change.
- Interlocking subunit 23 When the signal outputted by the first stage unit to the interlocking subunit 23 is the same, the subunit will lock the output result, that is, when the interlocking subunit receives two high/low level signals simultaneously, the subunit The unit output is either full low or full high.
- Delay subunit 24 The thyristor in the power component module 15 is turned off, and the load current in the thyristor needs to be less than a certain value. At this time, if the power component driving signal is likely to cause a phase short circuit between the solid state relays, that is, in a When the group power components are not completely turned off, another group of power components are turned on, thereby causing phase-to-phase short circuit, and the delay sub-unit 24 delays the control signal outputted to the driving module 14 to the power component module 15. The power component is turned off and then output to the drive module 14.
- the phase loss protection subunit 21 further includes:
- the first resistor R1 is connected to the anode of the first diode D1, and the anode of the first diode D1 is also connected to the first input terminal 110, and the anode of the first diode D1 is the first phase of the phase loss protection subunit 21.
- An output terminal 0311 is connected to the anode of the first diode D1 and the anode of the first diode D1 is also connected to the first input terminal 110, and the anode of the first diode D1 is the first phase of the phase loss protection subunit 21.
- An output terminal 0311 is connected to the anode of the first diode D1, and the anode of the first diode D1 is also connected to the first input terminal 110, and the anode of the first diode D1 is the first phase of the phase loss protection subunit 21.
- the second resistor R2 is connected to the anode of the second diode D2, and the anode of the second diode D2 is also connected to the second input terminal 120, and the anode of the second diode D2 is the first phase of the phase loss protection subunit 21.
- the cathode of the first diode D1 is connected to the cathode of the second diode D2 and is connected to the third input terminal 130.
- the phase loss protection sub-unit 21 outputs the same two control signals.
- the invention does not limit the specific circuit form.
- the automatic phase correction sub-unit 22 further includes: a first exclusive OR logic device IC11, a second exclusive OR logic device IC12.
- Any one input of the first exclusive OR logic device IC11 is connected to any one of the input terminals of the second exclusive OR logic device IC12, and the input terminal of the first exclusive OR logic device IC11 is connected to the fourth input terminal 140.
- the other input of the first exclusive OR logic device IC11 is coupled to the first output terminal 0311 of the phase loss protection subunit, and the output of the first exclusive OR logic device IC11 is referred to as the output terminal 0313.
- the other input of the second exclusive OR logic device IC12 is coupled to the second sub-output 0312, and the output of the second exclusive OR logic device IC12 is designated as output 0314.
- the above circuit is only a preferred embodiment of the automatic phase correction sub-unit. In the specific implementation, there are many alternatives. As shown in FIG. 5b, it is composed of two identical or logic devices. When the phase sequence signal is changed, the automatic phase correction sub-unit 22 The output signal will change. The invention does not limit the specific circuit form.
- the interlocking subunit 23 further includes: a third resistor R3, a first capacitor C1, a third exclusive OR logic device IC13, a fourth exclusive OR logic device IC14, a first AND logic device IC21, a second logic Device IC22.
- One end of the third resistor R3 is connected to the working power supply, and the other end is connected to any input end of the third exclusive OR logic device IC13, any input end of the fourth exclusive OR logic device IC14, and any end of the first capacitor C1; The other end of the first capacitor C1 is connected to the working ground.
- the other input terminal of the third exclusive OR logic device IC13 is connected to an output terminal 0313 of the first exclusive OR logic device, and an input terminal of the second AND logic device IC22, respectively.
- the output of the third exclusive OR logic device IC13 is coupled to any one of the first AND logic device IC21.
- the other input of the fourth exclusive OR logic device IC14 is coupled to the output 0314 of the second exclusive OR logic device, and the other input of the first AND logic device IC21, respectively.
- the output of the fourth exclusive OR logic device IC14 is coupled to the other input of the second AND logic device IC22.
- the output of the first and logic device IC21 is recorded as the output terminal 0315;
- the output of the second and logic device IC22 is denoted as output 0316.
- the above circuit is only a preferred embodiment of the interlocking subunit.
- two identical or logic devices, two NAND devices, one resistor, and one capacitor are formed.
- 6c consists of two reverse logic devices, two logic devices. When there are two identical signal inputs, the signal through the reverse logic device is reversed. The signal entering into the logic device is two different signals, and the output is at the full low level; when two different signals are input to the interlocking subunit, the signal through the reverse logic device is reversed. The signal input to one of the logic devices is a full high level, and the signal input to the other logic device is a full low level. At this time, the signals output from the two logic devices are a high level and a low level. In this way, the control signal output from the interlocking subunit to the drive module is not valid at the same time.
- the invention does not limit the specific circuit form.
- the delay sub-unit 23 further includes:
- Fourth resistor R4 fifth resistor R5, sixth resistor R6, seventh resistor R7, eighth resistor R8, second capacitor C2, third capacitor C3, third diode D3, fourth diode D4, Three with logic device IC23, fourth and logic device IC24.
- the third diode D3 is connected in parallel with the fourth resistor R4, the cathode of the third diode D3 is connected to the output terminal 0315 of the first AND logic device, and the anode of the third diode D3 is respectively connected to any end of the eighth resistor R8.
- the third is connected to any input of the logic device IC23.
- the fourth diode D4 is connected in parallel with the fifth resistor R5, the cathode of the fourth diode D4 is connected to the output terminal 0316 of the second logic device, and the anode of the fourth diode D4 and the seventh resistor R7 are respectively connected to one end, The fourth is connected to any input of the logic device IC24.
- the other end of the seventh resistor R7 is connected to the anode of the second capacitor C2, and the cathode of the second capacitor C2 is connected to the working ground.
- the other end of the eighth resistor R8 is connected to the anode of the third capacitor C3, and the cathode of the third capacitor C3 is connected to the working ground.
- Either end of the sixth resistor R6 is connected to the other input terminal of the third and logic device IC23, and the other input terminal of the fourth and logic device IC24, and the other end of the sixth resistor R6 is connected to the operating power source.
- the output of the third and logic device IC23 is coupled to the first output terminal 010.
- the output of the fourth and logic device IC24 is coupled to the second output terminal 020.
- the phase sequence detection module 122 further includes:
- the first phase L1 of the three-phase power supply is respectively connected to any one of the fifteenth resistor R15 and any one of the sixth capacitor C6.
- the other end of the fifteenth resistor R15 is connected to any one of the fourteenth resistor R14, one end of the eighteenth resistor R18, the anode of the eleventh diode D11, and the cathode of the twelfth diode D12.
- the other end of the sixth capacitor C6 is connected to either end of the sixteenth resistor R16.
- the other end of the sixteenth resistor R16 is connected to the other end of the eighteenth resistor R18, the seventeenth resistor R17, the anode of the thirteenth diode D13, and the cathode of the fourteenth diode D14.
- the second phase L2 of the three-phase power supply is connected to either end of the fifth capacitor C5.
- the other end of the fifth capacitor C5 is connected to the other end of the fourteenth resistor R14.
- the third phase of the three-phase power supply L3 is connected to the other end of the seventeenth resistor R17.
- the anode of the first photocoupler IC31 is connected to the cathode of the eleventh diode D11, the cathode of the thirteenth diode D13, and the seventh end of the seventh capacitor C7, and the cathode is connected to the nineteenth resistor R19. One end.
- the other end of the nineteenth resistor R19 is connected to the other end of the seventh capacitor C7, the anode of the twelfth diode D12, and the anode of the fourteenth diode D14;
- the collector of the output terminal of the first photocoupler IC31 is connected to the working power source, and the emitter is respectively connected to any end of the twentieth resistor R20, any end of the eighth capacitor C8, and the fourth input terminal 140.
- the other end of the twentieth resistor R20 and the other end of the eighth capacitor C8 are respectively connected to the working ground.
- phase sequence detecting module is only a preferred embodiment of the phase sequence detecting module.
- phase sequence detecting module there are many alternatives, as shown in Figure 8b, consisting of nine resistors, three diodes, three optocouplers, four NAND devices, and two A triode, a capacitor.
- the input terminals of the three optocouplers and the diode form a three-phase rectifier bridge, and the three resistors are used to define the current in the rectifier bridge.
- the three optocouplers will output six groups of signals, and the six groups of signals pass through four
- the non-logic device outputs a duty cycle signal of the same period as the three-phase power, or is a high-level 100% duty signal, and the ⁇ level signal turns off the PNP transistor, and finally outputs a high-level signal as the phase sequence state at this time.
- a high-level 5/6 duty cycle signal that causes the PNP transistor to be turned on for 1/6 cycles to charge the subsequent capacitor and turn the NPN transistor on, and another 5/6 cycle by capacitor
- the discharge keeps the NPN transistor turned on, and finally outputs a low level as the phase sequence state at this time;
- Figure 8c The circuit changes the circuit of the output end of the photocoupler device based on Fig. 8a, and outputs the phase sequence signal opposite to that of Fig. 8a. Different phase sequence states.
- the present invention does not limit the specific circuit form.
- the phase loss detecting module 121 further includes:
- the first phase L1 of the three-phase power supply is connected to either end of the ninth resistor R9; the other end of the ninth resistor R9 is connected to the fifth two The anode of the pole tube D5, the cathode of the eighth diode D8;
- the second phase L2 of the three-phase power supply is connected to any one end of the tenth resistor R10; the other end of the tenth resistor R10 is connected to the anode of the sixth diode D6 and the cathode of the ninth diode D9, respectively;
- the third phase of the three-phase power supply L3 is connected to any one end of the eleventh resistor R11; the other end of the eleventh resistor R11 is respectively connected to the anode of the seventh diode D7 and the cathode of the tenth diode D10;
- the anode of the second photocoupler IC 32 is connected to the cathode of the fifth diode D5, the cathode of the sixth diode D6, the cathode of the seventh diode D7, and the cathodes of the LEDs are respectively connected.
- the collector of the output transistor of the second photocoupler IC32 is connected to the working power supply, and the emitter of the output transistor is connected to any end of the twelfth resistor R12 and the base of the first transistor Q1.
- the other end of the twelfth resistor R12 is connected to the working place;
- the collector of the first transistor Q1 is connected to the working power source, and the emitter is connected to either end of the fourth capacitor C4 and any end of the thirteenth resistor R13; the other end of the fourth capacitor C4 is connected to the working ground.
- the base of the second transistor Q2 is connected to the other end of the thirteenth resistor R13, and its collector is connected to the third input terminal 130, and the emitter is connected to the working ground.
- phase loss detecting module is only a preferred embodiment of the phase loss detecting module.
- the schematic diagram is based on the phase loss detecting circuit of FIG. 9a, and an inverse is added to the output end of the phase loss signal.
- the phase loss signal opposite to that output in Figure 9a is used to indicate the phase loss state at this time.
- the invention does not limit the specific circuit form.
- the three-phase power is connected to the phase sequence detecting module 122.
- the phase sequence detecting module 122 detects the phase sequence of the three-phase power supply, and provides a phase sequence signal to the signal processing unit 132 of the automatic phase correction and phase loss protection logic module 13.
- phase loss detecting module 121 detects whether there is a phase loss of the three-phase power supply, and provides a phase loss signal to the signal processing unit of the automatic phase correction and phase loss protection logic module 13.
- Control signal CS input signal conversion unit 131 processes the control signal CS and outputs it to the signal processing unit 132.
- the signal processing unit 132 processes the signal transmitted by the signal conversion unit 131 and the signals input by the phase sequence detecting module 122 and the phase loss detecting module 121, and outputs the processed control result to the driving module 14.
- S5 The drive module 14 controls the phase sequence of the three-phase motor by controlling the power component module 15.
- steps S1 to S5 are sequentially connected.
- steps Sl, S2, and S3 are not sequentially performed, and the three may be performed simultaneously or in different order.
- the present invention does not limit the order of steps S1, S2, S3.
- the step S1 further includes:
- the high/low level is set to the forward phase sequence of the three-phase power source, and the low/high level is the reverse phase sequence of the three-phase power source.
- the phase sequence detecting module 122 outputs a phase sequence state according to the current input phase of the three-phase power source.
- Corresponding high/low level signals are sent to signal processing unit 132.
- Step S2 further comprising:
- the high/low level is set to phase loss of the three-phase power supply, and the low/high level is no phase loss for the three-phase power supply.
- the phase loss detection module 121 outputs a corresponding according to the currently input phase loss state of the three-phase power supply. High/low level signal to signal processing unit
- Step S4 further includes:
- phase loss protection subunit 21 The signal of the signal conversion unit 131 and the phase loss signal are input to the phase loss protection subunit 21.
- the sub-unit directly locks the output result according to the phase loss signal output by the phase loss detecting module 121, even if outputted to the driving module 14 The control signal is invalid.
- the output signal of the phase loss protection subunit 21 and the phase sequence signal are input to the automatic phase correction subunit 22.
- the automatic phase-correcting sub-unit 22 will output the phase according to the phase-sequence detecting unit 122.
- the sequence signal makes the input control signal output the opposite, that is, the input control signal is high/low level, and the output of the automatic phase correction sub-unit is low/high level, and finally the phase sequence of the three-phase power supply to the load is not change.
- S43 The output signal of the automatic phase-correcting sub-unit 22 is supplied to the interlocking sub-unit 23.
- the interlocking sub-unit 23 receives a pair of (two) identical signals, the sub-unit will output a pair (two) of low power. level.
- step S2 the order of the phase loss protection subunit 21 and the automatic phase correction subunit 22 may be interchanged.
- the present invention does not limit the order of the above steps.
- the solid state relay structure of the present invention has a concentrated function, and itself can realize automatic phase correction and phase loss protection of the power supply of the three-phase motor, and it is not necessary to connect external devices.
- the structure for realizing automatic phase correction and phase loss protection in the solid state relay of the present invention is completely realized by discrete components, that is, hardware circuits.
- the controller MCU/DSP that may be used by external devices is eliminated, which saves costs, that is, the same function is realized at a low price.
- the two control input signals of the forward rotation and the reverse rotation are interlocked and delayed for a period of time to be supplied to the control logic, thereby solving the phase-to-phase short circuit caused by the thyristor turn-off characteristic.
- the solid state relay operates in a strong electric environment, and requires the working device to have strong anti-interference ability.
- the structure of the solid relay of the present invention is realized by a discrete component, that is, a hardware circuit, so that it has a powerful Anti-interference ability.
- the structure of the solid state relay of the present invention is realized by discrete components, that is, hardware circuits, which is superior to the circuit implemented by the MCU/DSP, and there is no crash phenomenon, and there is no device caused by software operation errors. Damage, or a bigger accident may be.
- the implementation circuit of the present invention is simple, safe and reliable.
- the invention can detect the occurrence of phase loss in real time, so that the three-phase alternating current motor disables the control signal input when the three-phase power source is out of phase, and turns off the power component to prevent the motor from being damaged due to phase loss operation.
- the present invention monitors the phase sequence of the three-phase electric input in real time.
- the internal control logic issues a corresponding control command to keep the phase sequence added to the motor unchanged, thereby avoiding the phase sequence change.
- the direction of motor running is inconsistent with the desired direction.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Ac Motors In General (AREA)
- Train Traffic Observation, Control, And Security (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
Description
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