CN114400171A - Electric operating mechanism with 485 interface - Google Patents
Electric operating mechanism with 485 interface Download PDFInfo
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- CN114400171A CN114400171A CN202210014044.4A CN202210014044A CN114400171A CN 114400171 A CN114400171 A CN 114400171A CN 202210014044 A CN202210014044 A CN 202210014044A CN 114400171 A CN114400171 A CN 114400171A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
- H01H3/26—Power arrangements internal to the switch for operating the driving mechanism using dynamo-electric motor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H3/00—Mechanisms for operating contacts
- H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
- H01H3/26—Power arrangements internal to the switch for operating the driving mechanism using dynamo-electric motor
- H01H2003/266—Power arrangements internal to the switch for operating the driving mechanism using dynamo-electric motor having control circuits for motor operating switches, e.g. controlling the opening or closing speed of the contacts
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H2071/109—Operating or release mechanisms with provisions for selecting between automatic or manual reset
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Abstract
The invention provides an electric operating mechanism with a 485 interface, which replaces a PCBA in the existing electric operating mechanism with the PCBA with the 485 interface. The PCBA with the 485 interface comprises a connector, a switching power supply, a communication circuit, a switch digital circuit, a motor driving circuit and an MCU. The connectors include CN1, CN2 and CN3, CN1 external interface-AB of AC220V and 485, CN2 and CN3 are responsible for interfacing internal switches and motors. The switching power supply provides three sets of power supplies, DC24V and DC5V, which are common, and DC5V, which is independent. The communication circuit is composed of an interface protection circuit, a 485 driving circuit, a magnetic isolation chip and an independent DC5V power supply, and is completely isolated from the MCU. The switch digitization circuit digitizes the switch-on position switch signal accessed from CN2, the switch-off position switch accessed from CN3 and the manual automatic transfer switch signal and sends the signals to the MCU. The motor driving circuit is characterized in that the MCU outputs a digital control signal to the motor chip, and the motor chip drives the motor to start, run and stop.
Description
Technical Field
The invention relates to the technical field of circuit breakers, in particular to an electric operating mechanism with a 485 interface.
Background
The electric operating mechanism is one of external accessories of an air switch, and is an accessory for a remote automatic opening and closing circuit breaker. That is, the remote control is performed by a point-to-point opening and closing operation at a remote end by means of an operation button arranged at the remote end and connected to a passive contact by a cable. With the rapid development of the internet of things, particularly the construction and development of the power internet of things, the intelligent demand of people on power utilization is greatly improved, and the existing electric operating mechanism realizes remote operation due to passive contacts, has no way of networking, has no way of switching off and switching on from remote equipment, and brings great obstruction to the development of the power internet of things.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a method for processing a multi-functional chip.
In order to achieve the purpose, the invention adopts the following technical scheme:
an electric operating mechanism with a 485 interface comprises an electric operating mechanism body, the electric operating mechanism body also comprises a PCB with the 485 interface, the PCB is also connected with a connector, a switching power supply circuit, a 485 communication circuit, a switching digitization circuit, a motor driving circuit and an MCU, the connector comprises a connector CN1, a connector CN2 and a connector CN3, the connector CN1 is externally connected with a 485 communication circuit and the switching power supply circuit, the connector CN2 is internally connected with a digitizing circuit, the connector CN3 is internally connected with a digitizing circuit and a motor driving circuit, the digitalized circuit connected with the connector CN2 is an opening position switch signal circuit, the digitalized circuit connected with the connector CN3 is an opening position switch and manual-automatic switching switch signal circuit, and the opening position switch signal circuit, the opening position switch and manual-automatic switching switch signal circuit and the motor driving circuit are all connected with the MCU.
Further, the 485 communication circuit is connected between a pin 1 and a pin 2 of a connector CN1, the 485 communication circuit is composed of an interface protection circuit, a 485 driving circuit and a magnetic isolation circuit, the 485 communication circuit is connected with an MCU through the magnetic isolation circuit, the 485 driving circuit further comprises a self-switching circuit for receiving and transmitting, and the interface protection circuit is composed of a transient suppression diode 4D1, a transient suppression diode 4D2, a resistor RA1, a resistor RA2, a resistor RB1 and a resistor RB 2; the 485 driving circuit consists of a transceiver U7 and a capacitor 4C 4; the transceiver self-switching circuit consists of a triode Q2, a capacitor 4C2, a capacitor 4C1, a resistor 4R2 and a resistor 4R 1; the magnetic isolation circuit consists of a digital isolator U8 and a capacitor C19;
the input end of the resistor RA2 is connected with a pin 1 of a connector CN1, the output end of the resistor RA2 is connected with a pin 6 of a transceiver U7, the cathode of the transient suppression diode 4D2 is connected with the input end of the resistor RA2, the anode of the transient suppression diode 4D2 is connected with a pin 5 of the transceiver U7, the input end of the resistor RA1 is connected with the output end of the resistor RA2, and the output end of the resistor RA1 is connected with a pin 8 of the transceiver U7; the input end of the resistor RB2 is connected with a pin 2 of a connector CN1, the output end of the resistor RB2 is connected with a pin 7 of a transceiver U7, the cathode of the transient suppression diode 4D1 is connected with the input end of the resistor RB2, the anode of the transient suppression diode 4D1 is connected with a pin 5 of the transceiver U7, the input end of the resistor RB1 is connected with the output end of a resistor RB2, and the output end of the resistor RB1 is connected with a pin 5 of the transceiver U7; one end of the capacitor 4C4 is connected with the pin 8 of the transceiver U7, and the other end of the capacitor 4C4 is grounded; pin 2 and pin 3 of the transceiver U7 are connected to the collector of a transistor Q2, one end of a resistor 4R2 is connected to the collector of the transistor Q2, the other end of the resistor 4R2 is connected to pin 5 of a digital isolator U8, a capacitor 4C2 is connected in parallel to both ends of the resistor 4R2, one end of the resistor 4R1 is connected to the base of a transistor Q2, the other end of the resistor 4R1 is connected to pin 6 of a digital isolator U8, the emitter of the transistor Q2 is connected to pin 8 of the digital isolator U8, one end of a capacitor 4C1 is connected between the emitter of the transistor Q2 and pin 8 of the digital isolator U8, the other end of the capacitor 4C1 is grounded, pin 1 of the digital isolator U8 is connected to VCC, one end of a capacitor C19 is connected between pin 1 and pin 8 of the digital isolator U8, the other end of the capacitor C19 is grounded, and the pin 4 of the digital isolator U8 is grounded.
Further, the switching power supply circuit is connected between a pin 5 and a pin 4 of the connector CN1, the switching power supply circuit comprises a 250V alternating current power supply, a bridge rectifier circuit, a transformer T1, a power supply control circuit, a 24V power supply circuit and a 5V power supply circuit, the bridge rectifier circuit, the transformer T1 and the power supply control circuit convert the 250V alternating current power supply into a 24V power supply and a 5V power supply, the 24V power supply circuit supplies power to the motor control circuit and the motor drive circuit, and the 5V power supply circuit supplies power to the 485 communication circuit;
Further, the power control circuit is composed of a power controller IC1, a field effect transistor Q1, a diode D1, a diode D2, a diode D3, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C12, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R16, a resistor RA, a resistor RB and a resistor RC;
a capacitor C1 is connected in parallel to an output terminal of the bridge rectifier circuit, a resistor R1 and a resistor R1 are connected in series and then connected in parallel between a pin 6 and a pin 10 of a transformer T1, the resistor R1 and the capacitor C1 are connected in parallel, one end of the resistor R1 is connected to a negative electrode of a diode D1, and the two are connected in series with the resistor R1, the resistor R1 and the capacitor C1, the resistor R1, the capacitor C1, the resistor R1 and the diode D1 are connected in parallel between the pin 6 and the pin 8 of the transformer T1, the pin 8 of the transformer T1 is connected to a drain of a field effect transistor Q1, the pin 10 of the transformer T1 is connected to a pin 5 of the power controller IC1, and the two have the diode D1 and the resistor R1 connected in series, an anode of the diode D1 is connected to the pin 10 of the transformer T1, a cathode of the diode D1 is connected to the resistor R1, and a capacitor C1 are connected in parallel with the pin 365 of the transformer T1 and the power controller IC 1. The grid of the field-effect tube Q1 is connected with a pin 6 of a power controller IC1, a resistor R12 and a resistor R13 are connected in series between the grid of the field-effect tube Q1 and a pin 6 of the power controller IC1, a diode D3 is connected in parallel at two ends of the resistor R13, the positive electrode of the diode D3 is connected with the grid of the field-effect tube Q1, the source of the field-effect tube Q1 is connected with a pin 4 of the power controller IC1, a capacitor C5, a resistor RA, a resistor RB and a resistor RC are connected in parallel, the parallel connection is connected in parallel between the source of the field-effect tube Q1 and the pin 4 of the power controller IC1, the resistor R14 is connected in series between the source of the field-effect tube Q1 and the pin 4 of the power controller IC1, the pin 1 of the power controller IC1 is grounded, the pin 2 of the power controller IC1 is connected with the pin 4 of an optocoupler U2, the pin 3 of the optocoupler U2 is grounded, and the pin 3 of the optocoupler U2 is connected in parallel with a capacitor C12.
Further, the 24V power supply circuit is connected in parallel between a pin 13 and a pin 11 of a transformer T1, and the 24V power supply circuit is composed of a resistor R17, a resistor R18, a resistor R20, a resistor R21, a resistor R22, a resistor R23, a resistor R23A, a resistor R24, a capacitor C6, a capacitor C7, a capacitor C9, a capacitor C10, a capacitor C11, a diode D4, a diode D5, and a three-terminal regulator tube U3;
a pin 13 of a transformer T1 is connected with a pin 1 of an optical coupler U1, a pin 13 of the transformer T1 is connected with a pin 2 of the optical coupler U1, a diode D1 is connected in series in a forward direction between the pin 13 of the transformer T1 and the pin 2 of the optical coupler U1, a resistor R1 and a resistor R1 are connected in parallel with each other and then connected in parallel with both ends of the diode D1, a capacitor C1 is connected in series between the resistor R1 and the diode D1, a capacitor C1 and a capacitor C1 are connected in parallel with each other and then connected in parallel between the pin 13 and the pin 11 of the transformer T1, a positive pole of the diode D1 is connected with a pin 12 of the transformer T1, a negative pole of the diode D1 is connected with the independent 5V power circuit, the resistor R1 is connected in series between the pin 13 of the transformer T1 and the pin 1 of the optical coupler U1, the resistor R1 and the capacitor C1 are connected in parallel with both ends of the pin 1 of the optical coupler U1, and the pin 1, and the capacitor C1 are connected with both ends of the pin 1 of the optical coupler U1 and the pin 1. The resistor R23 and the resistor R23A are connected in parallel and then connected between the input end of the three-terminal regulator tube U3 and the ground terminal, the output end of the three-terminal regulator tube U3, the resistor R23 and the resistor R23A are connected in parallel at two ends of the capacitor C11, and the ground terminal of the three-terminal regulator tube U3 is grounded.
Further, the 5V power supply circuit is connected in parallel between a pin 1 and a pin 2 of the transformer T1, and the 5V power supply circuit consists of a three-terminal integrated voltage regulator U5, a diode D6, a capacitor C18 and a capacitor C17;
the anode of the diode D6 is connected with a pin 1 of the transformer T1, the cathode of the diode D6 is connected with a pin 3 of the three-terminal integrated voltage stabilizer U5, a pin 2 of the three-terminal integrated voltage stabilizer U5 is connected with a pin 2 of the transformer T1, a capacitor C17 is connected between the pin 2 and the pin 3 of the three-terminal integrated voltage stabilizer U5 in parallel, a capacitor C18 is connected between the pin 2 and the pin 1 of the three-terminal integrated voltage stabilizer U5 in parallel, and the pin 1 of the three-terminal integrated voltage stabilizer U5 is also connected with the 485 communication circuit.
Further, the switching power supply circuit further comprises an independent 5V power supply circuit, the independent 5V power supply circuit supplies power to the MCU circuit, and the independent 5V power supply circuit is composed of a three-terminal integrated voltage regulator U6, a capacitor C15 and a capacitor C16; a capacitor C16 is connected between a pin 1 and a pin 2 of the three-terminal integrated voltage stabilizer U6 in parallel, a capacitor C15 is connected between a pin 3 and a pin 2 of the three-terminal integrated voltage stabilizer U6 in parallel, a pin 1 of the three-terminal integrated voltage stabilizer U6 is grounded, a pin 1 of the three-terminal integrated voltage stabilizer U6 is connected with the MCU circuit, and a pin 3 of the three-terminal integrated voltage stabilizer U6 is connected with a negative electrode of a diode D5.
Further, the MCU circuit comprises an STC single chip microcomputer, a capacitor C20 and a capacitor C21; and the capacitor C20 and the capacitor C21 are connected in parallel and then connected between a pin 2 and a pin 4 of the STC single chip microcomputer, the pin 2 of the STC single chip microcomputer is connected with the independent 5V power circuit, and the pin 4 of the STC single chip microcomputer is grounded.
Further, the motor driving circuit comprises a direct current motor driving chip U4, a resistor R4, a resistor R28, a resistor R29, a resistor R30, a resistor R31, a capacitor C22, a capacitor C23, a capacitor C24, a capacitor C25 and a three-terminal integrated regulator U9; pin 6 and pin 1 of the dc motor driving chip U4 are connected to each other, pin 6 and pin 5 of the dc motor driving chip U4 are connected to each other, a capacitor C22 is also connected in series between pin 6 and pin 5 of the dc motor driving chip U4, capacitor C23 is connected in parallel to both sides of capacitor C22, one end of capacitor C23 is connected to a 24V power supply circuit, resistor R4 is connected in series with pin 7 of the dc motor driving chip U4, pin 5, pin 6, pin 7 and pin 1 of the dc motor driving chip U4 are grounded together, resistor R31 is connected in series with pin 3 of the dc motor driving chip U4 and then connected to a VCC power supply, pin 4 of the dc motor driving chip U4 is connected in series with capacitor C25 and then grounded, resistor R29 is connected in series with resistor R30, capacitor C24 is connected in parallel to both ends of resistor R29 and resistor R30, a ground terminal of an integrated resistor U9 is connected between resistor R29 and a terminal R30, a three terminal of the integrated resistor U9 is connected to an input terminal of the dc motor driving chip 4, the output end of the three-terminal integrated voltage stabilizer U9 is connected with the resistor R30 and the capacitor C24 in common, one end of the resistor R28 is connected with VCC, and the other end of the resistor R28 is connected with the resistor R29.
Further, the motor driving circuit further comprises a motor driving circuit, and the motor driving circuit comprises a high load switch CN2, a high load switch CN3, a direct current motor M1, a resistor R25, a resistor R26, a resistor R27, a manual/automatic change-over switch S1, a closing switch S2, and a breaking switch S3; the direct current motor M1 is connected in parallel between a pin 1 and a pin 5 of a high load switch CN3, a resistor R25 is connected in series with a pin 3 of the high load switch CN3, a resistor R26 is connected in series with a pin 4 of the high load switch CN3, a resistor R27 is connected in series with a pin 2 of the high load switch CN2, unconnected terminals of the resistor R25, the resistor R26 and the resistor R27 are connected with each other and connected with an independent 5V power circuit, a pin 2 of the high load switch CN2 is grounded, a manual automatic switch S1 and a closing switch S2 are respectively connected in series with the high load switch CN3, unconnected terminals of the manual automatic switch S1 and the closing switch S2 are grounded together, and the opening switch S3 and the high load switch CN2 are connected in series with each other.
Compared with the prior art, the invention has the beneficial effects that:
1. a PCBA with 485 interface is designed to replace the original PCBA controlled by wet nodes
2. Take PCBA of 485 interfaces, the characteristics are:
(1) an MCU is introduced;
(2) a 485 communication interface is introduced;
(3) the switching power supply adopts 3 groups of voltage outputs, wherein one group is used for 485 isolation;
(4) the switch input signal is subjected to digital conversion;
(5) a motor driving chip with a digital interface is adopted for motor control.
3. The layout of an original power distribution box is not required to be damaged, and only an electric operating mechanism is required to be installed on an original circuit breaker;
4. the existing circuit breakers in the distribution box are not replaced to cause waste;
5. the electric operating mechanism is suitable for circuit breakers of various brands, and meets the differentiated requirements of customers on the brand of the circuit breakers;
6. the intelligent mobile phone can participate in power utilization management at any time and any place, and power utilization planning, regulation in the process of the events and evaluation and feedback after the events are achieved.
Drawings
FIG. 1 is a general flow chart of the present invention;
FIG. 2 is a circuit diagram of the connector of the present invention;
FIG. 3 is a model view of connector CN1 of the present invention;
FIG. 4 is a circuit diagram of the MCU of the present invention;
FIG. 5 is a 485 communication circuit diagram of the present invention;
FIG. 6 is a circuit diagram of the motor driving circuit of the present invention;
FIG. 7 is a circuit diagram of the motor switching on and off according to the present invention;
FIG. 8 is a circuit diagram of the independent 5V power supply of the present invention.
Detailed Description
In order to further understand the objects, structures, features and functions of the present invention, the following embodiments are described in detail.
An electric operating mechanism with a 485 interface, as shown in fig. 1, 2, 3, 4, 5, 6, 7 and 8, comprises an electric operating mechanism body, the electric operating mechanism body further comprises a PCB with a 485 interface, the PCB is further connected with a connector, a switching power supply circuit, a 485 communication circuit, a switching digitizing circuit, a motor driving circuit and an MCU, the connector comprises a connector CN1, a connector CN2 and a connector CN3, the connector CN1 is externally connected with the 485 communication circuit and the switching power supply circuit, the connector CN2 is internally connected with the digitizing circuit and the connector CN3 is internally connected with the digitizing circuit and the motor driving circuit, the digitizing circuit connected with the connector CN2 is a switching-off position switching signal circuit, the digitizing circuit connected with the connector CN3 is a switching-on position switch and a manual automatic switching signal circuit, the opening position switch signal circuit, the closing position switch, the manual-automatic change-over switch signal circuit and the motor driving circuit are all connected with the MCU.
Further, the 485 communication circuit is connected between a pin 1 and a pin 2 of a connector CN1, the 485 communication circuit is composed of an interface protection circuit, a 485 driving circuit and a magnetic isolation circuit, the 485 communication circuit is connected with an MCU through the magnetic isolation circuit, the 485 driving circuit further comprises a self-switching circuit for receiving and transmitting, and the interface protection circuit is composed of a transient suppression diode 4D1, a transient suppression diode 4D2, a resistor RA1, a resistor RA2, a resistor RB1 and a resistor RB 2; the 485 driving circuit consists of a transceiver U7 and a capacitor 4C 4; the transceiver self-switching circuit consists of a triode Q2, a capacitor 4C2, a capacitor 4C1, a resistor 4R2 and a resistor 4R 1; the magnetic isolation circuit consists of a digital isolator U8 and a capacitor C19;
the input end of the resistor RA2 is connected with a pin 1 of a connector CN1, the output end of the resistor RA2 is connected with a pin 6 of a transceiver U7, the cathode of the transient suppression diode 4D2 is connected with the input end of the resistor RA2, the anode of the transient suppression diode 4D2 is connected with a pin 5 of the transceiver U7, the input end of the resistor RA1 is connected with the output end of the resistor RA2, and the output end of the resistor RA1 is connected with a pin 8 of the transceiver U7; the input end of the resistor RB2 is connected with a pin 2 of a connector CN1, the output end of the resistor RB2 is connected with a pin 7 of a transceiver U7, the cathode of the transient suppression diode 4D1 is connected with the input end of the resistor RB2, the anode of the transient suppression diode 4D1 is connected with a pin 5 of the transceiver U7, the input end of the resistor RB1 is connected with the output end of a resistor RB2, and the output end of the resistor RB1 is connected with a pin 5 of the transceiver U7; one end of the capacitor 4C4 is connected with the pin 8 of the transceiver U7, and the other end of the capacitor 4C4 is grounded; pin 2 and pin 3 of the transceiver U7 are connected to the collector of a transistor Q2, one end of a resistor 4R2 is connected to the collector of the transistor Q2, the other end of the resistor 4R2 is connected to pin 5 of a digital isolator U8, a capacitor 4C2 is connected in parallel to both ends of the resistor 4R2, one end of the resistor 4R1 is connected to the base of a transistor Q2, the other end of the resistor 4R1 is connected to pin 6 of a digital isolator U8, the emitter of the transistor Q2 is connected to pin 8 of the digital isolator U8, one end of a capacitor 4C1 is connected between the emitter of the transistor Q2 and pin 8 of the digital isolator U8, the other end of the capacitor 4C1 is grounded, pin 1 of the digital isolator U8 is connected to VCC, one end of a capacitor C19 is connected between pin 1 and pin 8 of the digital isolator U8, the other end of the capacitor C19 is grounded, and the pin 4 of the digital isolator U8 is grounded.
Further, the switching power supply circuit is connected between a pin 5 and a pin 4 of the connector CN1, the switching power supply circuit comprises a 250V alternating current power supply, a bridge rectifier circuit, a transformer T1, a power supply control circuit, a 24V power supply circuit and a 5V power supply circuit, the bridge rectifier circuit, the transformer T1 and the power supply control circuit convert the 250V alternating current power supply into a 24V power supply and a 5V power supply, the 24V power supply circuit supplies power to the motor control circuit and the motor drive circuit, and the 5V power supply circuit supplies power to the 485 communication circuit;
Further, the power control circuit is composed of a power controller IC1, a field effect transistor Q1, a diode D1, a diode D2, a diode D3, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C12, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R16, a resistor RA, a resistor RB and a resistor RC;
a capacitor C1 is connected in parallel to an output terminal of the bridge rectifier circuit, a resistor R1 and a resistor R1 are connected in series and then connected in parallel between a pin 6 and a pin 10 of a transformer T1, the resistor R1 and the capacitor C1 are connected in parallel, one end of the resistor R1 is connected to a negative electrode of a diode D1, and the two are connected in series with the resistor R1, the resistor R1 and the capacitor C1, the resistor R1, the capacitor C1, the resistor R1 and the diode D1 are connected in parallel between the pin 6 and the pin 8 of the transformer T1, the pin 8 of the transformer T1 is connected to a drain of a field effect transistor Q1, the pin 10 of the transformer T1 is connected to a pin 5 of the power controller IC1, and the two have the diode D1 and the resistor R1 connected in series, an anode of the diode D1 is connected to the pin 10 of the transformer T1, a cathode of the diode D1 is connected to the resistor R1, and a capacitor C1 are connected in parallel with the pin 365 of the transformer T1 and the power controller IC 1. The grid of the field-effect tube Q1 is connected with a pin 6 of a power controller IC1, a resistor R12 and a resistor R13 are connected in series between the grid of the field-effect tube Q1 and a pin 6 of the power controller IC1, a diode D3 is connected in parallel at two ends of the resistor R13, the positive electrode of the diode D3 is connected with the grid of the field-effect tube Q1, the source of the field-effect tube Q1 is connected with a pin 4 of the power controller IC1, a capacitor C5, a resistor RA, a resistor RB and a resistor RC are connected in parallel, the parallel connection is connected in parallel between the source of the field-effect tube Q1 and the pin 4 of the power controller IC1, the resistor R14 is connected in series between the source of the field-effect tube Q1 and the pin 4 of the power controller IC1, the pin 1 of the power controller IC1 is grounded, the pin 2 of the power controller IC1 is connected with the pin 4 of an optocoupler U2, the pin 3 of the optocoupler U2 is grounded, and the pin 3 of the optocoupler U2 is connected in parallel with a capacitor C12.
Further, the 24V power supply circuit is connected in parallel between a pin 13 and a pin 11 of a transformer T1, and the 24V power supply circuit is composed of a resistor R17, a resistor R18, a resistor R20, a resistor R21, a resistor R22, a resistor R23, a resistor R23A, a resistor R24, a capacitor C6, a capacitor C7, a capacitor C9, a capacitor C10, a capacitor C11, a diode D4, a diode D5, and a three-terminal regulator tube U3;
a pin 13 of a transformer T1 is connected with a pin 1 of an optical coupler U1, a pin 13 of the transformer T1 is connected with a pin 2 of the optical coupler U1, a diode D1 is connected in series in a forward direction between the pin 13 of the transformer T1 and the pin 2 of the optical coupler U1, a resistor R1 and a resistor R1 are connected in parallel with each other and then connected in parallel with both ends of the diode D1, a capacitor C1 is connected in series between the resistor R1 and the diode D1, a capacitor C1 and a capacitor C1 are connected in parallel with each other and then connected in parallel between the pin 13 and the pin 11 of the transformer T1, a positive pole of the diode D1 is connected with a pin 12 of the transformer T1, a negative pole of the diode D1 is connected with the independent 5V power circuit, the resistor R1 is connected in series between the pin 13 of the transformer T1 and the pin 1 of the optical coupler U1, the resistor R1 and the capacitor C1 are connected in parallel with both ends of the pin 1 of the optical coupler U1, and the pin 1, and the capacitor C1 are connected with both ends of the pin 1 of the optical coupler U1 and the pin 1. The resistor R23 and the resistor R23A are connected in parallel and then connected between the input end of the three-terminal regulator tube U3 and the ground terminal, the output end of the three-terminal regulator tube U3, the resistor R23 and the resistor R23A are connected in parallel at two ends of the capacitor C11, and the ground terminal of the three-terminal regulator tube U3 is grounded.
Further, the 5V power supply circuit is connected in parallel between a pin 1 and a pin 2 of the transformer T1, and the 5V power supply circuit consists of a three-terminal integrated voltage regulator U5, a diode D6, a capacitor C18 and a capacitor C17;
the anode of the diode D6 is connected with a pin 1 of the transformer T1, the cathode of the diode D6 is connected with a pin 3 of the three-terminal integrated voltage stabilizer U5, a pin 2 of the three-terminal integrated voltage stabilizer U5 is connected with a pin 2 of the transformer T1, a capacitor C17 is connected between the pin 2 and the pin 3 of the three-terminal integrated voltage stabilizer U5 in parallel, a capacitor C18 is connected between the pin 2 and the pin 1 of the three-terminal integrated voltage stabilizer U5 in parallel, and the pin 1 of the three-terminal integrated voltage stabilizer U5 is also connected with the 485 communication circuit.
Further, the switching power supply circuit further comprises an independent 5V power supply circuit, the independent 5V power supply circuit supplies power to the MCU circuit, and the independent 5V power supply circuit is composed of a three-terminal integrated voltage regulator U6, a capacitor C15 and a capacitor C16; a capacitor C16 is connected between a pin 1 and a pin 2 of the three-terminal integrated voltage stabilizer U6 in parallel, a capacitor C15 is connected between a pin 3 and a pin 2 of the three-terminal integrated voltage stabilizer U6 in parallel, a pin 1 of the three-terminal integrated voltage stabilizer U6 is grounded, a pin 1 of the three-terminal integrated voltage stabilizer U6 is connected with the MCU circuit, and a pin 3 of the three-terminal integrated voltage stabilizer U6 is connected with a negative electrode of a diode D5.
Further, the MCU circuit comprises an STC single chip microcomputer, a capacitor C20 and a capacitor C21; and the capacitor C20 and the capacitor C21 are connected in parallel and then connected between a pin 2 and a pin 4 of the STC single chip microcomputer, the pin 2 of the STC single chip microcomputer is connected with the independent 5V power circuit, and the pin 4 of the STC single chip microcomputer is grounded.
Further, the motor driving circuit comprises a direct current motor driving chip U4, a resistor R4, a resistor R28, a resistor R29, a resistor R30, a resistor R31, a capacitor C22, a capacitor C23, a capacitor C24, a capacitor C25 and a three-terminal integrated regulator U9; pin 6 and pin 1 of the dc motor driving chip U4 are connected to each other, pin 6 and pin 5 of the dc motor driving chip U4 are connected to each other, a capacitor C22 is also connected in series between pin 6 and pin 5 of the dc motor driving chip U4, capacitor C23 is connected in parallel to both sides of capacitor C22, one end of capacitor C23 is connected to a 24V power supply circuit, resistor R4 is connected in series with pin 7 of the dc motor driving chip U4, pin 5, pin 6, pin 7 and pin 1 of the dc motor driving chip U4 are grounded together, resistor R31 is connected in series with pin 3 of the dc motor driving chip U4 and then connected to a VCC power supply, pin 4 of the dc motor driving chip U4 is connected in series with capacitor C25 and then grounded, resistor R29 is connected in series with resistor R30, capacitor C24 is connected in parallel to both ends of resistor R29 and resistor R30, a ground terminal of an integrated resistor U9 is connected between resistor R29 and a terminal R30, a three terminal of the integrated resistor U9 is connected to an input terminal of the dc motor driving chip 4, the output end of the three-terminal integrated voltage stabilizer U9 is connected with the resistor R30 and the capacitor C24 in common, one end of the resistor R28 is connected with VCC, and the other end of the resistor R28 is connected with the resistor R29.
Further, the motor driving circuit further comprises a motor driving circuit, and the motor driving circuit comprises a high load switch CN2, a high load switch CN3, a direct current motor M1, a resistor R25, a resistor R26, a resistor R27, a manual/automatic change-over switch S1, a closing switch S2, and a breaking switch S3; the direct current motor M1 is connected in parallel between a pin 1 and a pin 5 of a high load switch CN3, a resistor R25 is connected in series with a pin 3 of the high load switch CN3, a resistor R26 is connected in series with a pin 4 of the high load switch CN3, a resistor R27 is connected in series with a pin 2 of the high load switch CN2, unconnected terminals of the resistor R25, the resistor R26 and the resistor R27 are connected with each other and connected with an independent 5V power circuit, a pin 2 of the high load switch CN2 is grounded, a manual automatic switch S1 and a closing switch S2 are respectively connected in series with the high load switch CN3, unconnected terminals of the manual automatic switch S1 and the closing switch S2 are grounded together, and the opening switch S3 and the high load switch CN2 are connected in series with each other.
Furthermore, firstly, 3 active nodes of the electric operating mechanism are changed into a digital communication interface-485 interface, so that the active nodes can be accessed into a 485 field bus system to realize information intercommunication and interconnection; secondly, the digital communication interface of the electric operating mechanism is to introduce an MCU module, digitize input (such as a manual/automatic state, a switch-on position state and a switch-off position state) and output (such as motor control) and butt joint with the MCU, namely to create an anti-interference operating environment for the MCU, and complete isolation measures are taken between the digital communication interface and the MCU through the arrangement of a plurality of output voltage groups of an isolation power supply; the electric operating mechanism can feed back the opening/closing state of the local circuit breaker to the remote end through the communication interface without additionally adding a wiring line.
Furthermore, the core of the invention is that MCU is introduced, input and output are digitized, 485 interfaces are introduced, MODBUS RTU protocol is supported, 3-output isolated power supply is designed, and the purpose of one-power multi-use is achieved by using a transformer and a power supply control circuit, so that the energy is saved and the efficiency is high.
Furthermore, the invention continues to use the mechanical body of the electric operating mechanism in the existing industrial chain, the original 3 active node PCBs are replaced by the PCBs with 485 interfaces, the models and the positions of the connectors CN1, CN2 and CN3 with the 485 interfaces are consistent with those of the original 3 active node PCBs, and besides the definition of the signals of CN1 (3 active node signals are changed into 2 485 signals), the signal definitions of CN2 and CN3 are completely consistent, only the PCBs are required to be replaced, other accessories are not required to be changed, the modification difficulty is greatly reduced, and the use cost is also reduced.
Further, the output isolated power supply is input AC220V (range AC90V-AC 265V), the output is DC24V (for motor), VCC (for MCU power supply, 5V or 3.3V) and 5V (for 485 interface), DC24V (for motor) and VCC (for MCU power supply, 5V or 3.3V) are in common ground, 5V (for 485 interface) is independent, the cost of the power supply is considered, the form of output multi-group is adopted for the switch transformer, and thus low-cost LDO scheme can be selected for VCC and 5V to realize.
Furthermore, the input and output of the electric operating mechanism are digitized because the MCU is introduced, the input and output of the electric operating mechanism must be digitized, except for the 485 interface, input signals comprise a manual/automatic change-over switch, an opening position switch and a closing position switch, and the output is controlled by a motor. The digitalization process is that input switch signals of the MCU are connected in series through VCC, a resistor, a switch and the ground, and the opening and closing of the switch are digitalized into 1 and 0 and then are sent to an I/O pin of the MCU; the motor control is realized by adopting a special motor chip, namely the motor chip is connected with an I/O pin of the MCU, so that the MCU outputs 1 or 0 to the motor chip through the I/O pin, and the motor chip realizes the operation control of the motor.
Furthermore, the electric operating mechanism can feed back the opening/closing state of the local circuit breaker to the far end through the communication interface without additionally adding a wiring line, because the communication interface of the electric operating mechanism is a 485 interface with bidirectional data transmission, after the input and the output are digitalized, the MCU can sense the current switch state of the circuit breaker, namely opening/closing, so that the far end can acquire the state of the local circuit breaker at any time and any place through a supported communication protocol (such as an MODBUS RTU protocol).
Furthermore, the electric operating mechanism can feed back the opening/closing state of the local circuit breaker to the far end through the communication interface without additionally adding a wiring line, because the communication interface of the electric operating mechanism is a 485 interface with bidirectional data transmission, after the input and the output are digitized, the MCU can sense the current switching state of the circuit breaker, namely opening/closing, so that the far end can acquire the state of the local circuit breaker at any time and any place through a supported communication protocol (such as an MODBUS RTU protocol), and the opening/closing state and the manual/automatic switching state of the local circuit breaker can be acquired at the far end.
Further, while connector CN1 was selected and defined for signals, CN1 is the external connector of the motorized operator, the present invention follows the use of the existing non-covered back-rest fence type terminal block row, with terminal block type number HB825-5, and HB825-5 being as sized as shown in fig. 4.
Further, the present invention includes the mechanical portion of the motor driven operating mechanism and the electronic portion of the PCBA. The mechanism part of the motor-driven operating mechanism is matched and fixed with a preset position of an existing circuit breaker through a screw, the existing circuit breaker handle is sleeved on the translation mechanism driven by the motor to realize the opening/closing operation of the existing circuit breaker, and an opening position switch signal connector plug (CN 2), a manual-automatic switching switch signal, a closing position switch signal and a motor control signal connector plug (CN 3) are arranged on the mechanism part of the motor-driven operating mechanism. The electronics portion of the PCBA also includes an external signal input connector (CN1), an internal signal connection socket (CN 2), and a connector socket (CN 3). The external signal input connector (CN1) comprises an AC220V input terminal (L, N) and a 485 interface terminal (A, B), and the AC220V input terminal (L, N) is connected with a power module to generate three groups of power supplies, namely: a motor power supply DC24V, an MCU power supply DC5V and a 485 communication isolation power supply DC 5V; the 485 interface terminal is connected to the 485 communication protection circuit, and the 485 communication protection circuit is connected to the 485 communication driver chip, adopts magnetism to keep apart the chip between 485 communication driver chip and the MCU and keeps apart. An internal signal connecting socket (CN 2) is plugged into a signal connector plug (CN 2) of the opening position switch and is connected into the MCU through digital processing; the internal signal connector socket (CN 3) is plugged with a manual automatic switching switch signal and a switching-on position switch signal and a motor control signal connector plug (CN 3), wherein: the hand-automatic switch signal and the switch-on position switch signal are accessed into the MCU through digital processing, and the output signal of the MCU is output by the motor chip through the motor chip and is connected to the CN3 to realize the driving of the motor.
The present invention has been described in relation to the above embodiments, which are only exemplary of the implementation of the present invention. It should be noted that the disclosed embodiments do not limit the scope of the invention. Rather, it is intended that all such modifications and variations be included within the spirit and scope of this invention.
Claims (9)
1. The utility model provides a take electric operating mechanism of 485 interfaces, includes the electric operating mechanism body, characterized by: the electric operating mechanism body further comprises a PCB with a 485 interface, the PCB is further connected with a connector, a switch power supply circuit, a 485 communication circuit, a switch digital circuit, a motor driving circuit and an MCU, the connector comprises a connector CN1, a connector CN2 and a connector CN3, the connector CN1 is externally connected with the 485 communication circuit and the switch power supply circuit, the connector CN2 is internally connected with the digital circuit and the connector CN3 is internally connected with the digital circuit and the motor driving circuit, the digital circuit connected with the connector CN2 is a switch-off position switch signal circuit, the digital circuit connected with the connector CN3 is a switch-on position switch and a hand automatic switch signal circuit, and the switch-off position switch signal circuit, the switch-on position switch and the hand automatic switch signal circuit and the motor driving circuit are all connected with the MCU.
2. The 485-interface-equipped electric operating mechanism according to claim 1, wherein: the 485 communication circuit is connected between a pin 1 and a pin 2 of a connector CN1, the 485 communication circuit consists of an interface protection circuit, a 485 drive circuit and a magnetic isolation circuit, the 485 communication circuit is connected with an MCU through the magnetic isolation circuit, the 485 drive circuit also comprises a receiving and transmitting self-switching circuit, and the interface protection circuit consists of a transient suppression diode 4D1, a transient suppression diode 4D2, a resistor RA1, a resistor RA2, a resistor RB1 and a resistor RB 2; the 485 driving circuit consists of a transceiver U7 and a capacitor 4C 4; the transceiver self-switching circuit consists of a triode Q2, a capacitor 4C2, a capacitor 4C1, a resistor 4R2 and a resistor 4R 1; the magnetic isolation circuit consists of a digital isolator U8 and a capacitor C19;
the input end of the resistor RA2 is connected with a pin 1 of a connector CN1, the output end of the resistor RA2 is connected with a pin 6 of a transceiver U7, the cathode of the transient suppression diode 4D2 is connected with the input end of the resistor RA2, the anode of the transient suppression diode 4D2 is connected with a pin 5 of the transceiver U7, the input end of the resistor RA1 is connected with the output end of the resistor RA2, and the output end of the resistor RA1 is connected with a pin 8 of the transceiver U7; the input end of the resistor RB2 is connected with a pin 2 of a connector CN1, the output end of the resistor RB2 is connected with a pin 7 of a transceiver U7, the cathode of the transient suppression diode 4D1 is connected with the input end of the resistor RB2, the anode of the transient suppression diode 4D1 is connected with a pin 5 of the transceiver U7, the input end of the resistor RB1 is connected with the output end of a resistor RB2, and the output end of the resistor RB1 is connected with a pin 5 of the transceiver U7; one end of the capacitor 4C4 is connected with the pin 8 of the transceiver U7, and the other end of the capacitor 4C4 is grounded; pin 2 and pin 3 of the transceiver U7 are connected to the collector of a transistor Q2, one end of a resistor 4R2 is connected to the collector of the transistor Q2, the other end of the resistor 4R2 is connected to pin 5 of a digital isolator U8, a capacitor 4C2 is connected in parallel to both ends of the resistor 4R2, one end of the resistor 4R1 is connected to the base of a transistor Q2, the other end of the resistor 4R1 is connected to pin 6 of a digital isolator U8, the emitter of the transistor Q2 is connected to pin 8 of the digital isolator U8, one end of a capacitor 4C1 is connected between the emitter of the transistor Q2 and pin 8 of the digital isolator U8, the other end of the capacitor 4C1 is grounded, pin 1 of the digital isolator U8 is connected to VCC, one end of a capacitor C19 is connected between pin 1 and pin 8 of the digital isolator U8, the other end of the capacitor C19 is grounded, and the pin 4 of the digital isolator U8 is grounded.
3. The 485-interface-equipped electric operating mechanism according to claim 1, wherein: the switch power supply circuit is connected between a pin 5 and a pin 4 of the connector CN1, the switch power supply circuit comprises a 250V alternating current power supply, a bridge rectifier circuit, a transformer T1, a power supply control circuit, a 24V power supply circuit and a 5V power supply circuit, the bridge rectifier circuit, the transformer T1 and the power supply control circuit convert the 250V alternating current power supply into a 24V power supply and a 5V power supply, the 24V power supply circuit supplies power for the motor control circuit and the motor drive circuit, and the 5V power supply circuit supplies power for the 485 communication circuit;
pin 4 of connector CN1 is connected with 250V AC power supply, a bridge rectifier circuit is connected in parallel between the other end of the 250V AC power supply and pin 5 of connector CN1, the output end of the bridge rectifier circuit is connected with pin 6 of the input end of transformer T1, a power supply control circuit is connected in parallel between pin 6 and pin 10 of the input end of transformer T1, a 5V power supply circuit is connected in parallel between pin 1 and pin 2 of the output end of transformer T1, a 24V power supply circuit is connected in parallel between pin 13 and pin 11 of the output end of transformer T1, and the power supply control circuit is connected with the 24V power supply circuit through an optical coupler U2.
4. The 485-interface-equipped electric operating mechanism according to claim 4, wherein: the power control circuit is composed of a power controller IC1, a field effect transistor Q1, a diode D1, a diode D2, a diode D3, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a capacitor C5, a capacitor C12, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R16, a resistor RA, a resistor RB and a resistor RC;
a capacitor C1 is connected in parallel to an output terminal of the bridge rectifier circuit, a resistor R1 and a resistor R1 are connected in series and then connected in parallel between a pin 6 and a pin 10 of a transformer T1, the resistor R1 and the capacitor C1 are connected in parallel, one end of the resistor R1 is connected to a negative electrode of a diode D1, and the two are connected in series with the resistor R1, the resistor R1 and the capacitor C1, the resistor R1, the capacitor C1, the resistor R1 and the diode D1 are connected in parallel between the pin 6 and the pin 8 of the transformer T1, the pin 8 of the transformer T1 is connected to a drain of a field effect transistor Q1, the pin 10 of the transformer T1 is connected to a pin 5 of the power controller IC1, and the two have the diode D1 and the resistor R1 connected in series, an anode of the diode D1 is connected to the pin 10 of the transformer T1, a cathode of the diode D1 is connected to the resistor R1, and a capacitor C1 are connected in parallel with the pin 365 of the transformer T1 and the power controller IC 1. The grid of the field-effect tube Q1 is connected with a pin 6 of a power controller IC1, a resistor R12 and a resistor R13 are connected in series between the grid of the field-effect tube Q1 and a pin 6 of the power controller IC1, a diode D3 is connected in parallel at two ends of the resistor R13, the positive electrode of the diode D3 is connected with the grid of the field-effect tube Q1, the source of the field-effect tube Q1 is connected with a pin 4 of the power controller IC1, a capacitor C5, a resistor RA, a resistor RB and a resistor RC are connected in parallel, the parallel connection is connected in parallel between the source of the field-effect tube Q1 and the pin 4 of the power controller IC1, the resistor R14 is connected in series between the source of the field-effect tube Q1 and the pin 4 of the power controller IC1, the pin 1 of the power controller IC1 is grounded, the pin 2 of the power controller IC1 is connected with the pin 4 of an optocoupler U2, the pin 3 of the optocoupler U2 is grounded, and the pin 3 of the optocoupler U2 is connected in parallel with a capacitor C12.
5. The 485-interface-equipped electric operating mechanism according to claim 4, wherein: the 24V power supply circuit is connected in parallel between a pin 13 and a pin 11 of a transformer T1, and the 24V power supply circuit is composed of a resistor R17, a resistor R18, a resistor R20, a resistor R21, a resistor R22, a resistor R23, a resistor R23A, a resistor R24, a capacitor C6, a capacitor C7, a capacitor C9, a capacitor C10, a capacitor C11, a diode D4, a diode D5 and a three-terminal voltage regulator tube U3;
a pin 13 of a transformer T1 is connected with a pin 1 of an optical coupler U1, a pin 13 of the transformer T1 is connected with a pin 2 of the optical coupler U1, a diode D1 is connected in series in a forward direction between the pin 13 of the transformer T1 and the pin 2 of the optical coupler U1, a resistor R1 and a resistor R1 are connected in parallel with each other and then connected in parallel with both ends of the diode D1, a capacitor C1 is connected in series between the resistor R1 and the diode D1, a capacitor C1 and a capacitor C1 are connected in parallel with each other and then connected in parallel between the pin 13 and the pin 11 of the transformer T1, a positive pole of the diode D1 is connected with a pin 12 of the transformer T1, a negative pole of the diode D1 is connected with the independent 5V power circuit, the resistor R1 is connected in series between the pin 13 of the transformer T1 and the pin 1 of the optical coupler U1, the resistor R1 and the capacitor C1 are connected in parallel with both ends of the pin 1 of the optical coupler U1, and the pin 1, and the capacitor C1 are connected with both ends of the pin 1 of the optical coupler U1 and the pin 1. The resistor R23 and the resistor R23A are connected in parallel and then connected between the input end of the three-terminal regulator tube U3 and the ground terminal, the output end of the three-terminal regulator tube U3, the resistor R23 and the resistor R23A are connected in parallel at two ends of the capacitor C11, and the ground terminal of the three-terminal regulator tube U3 is grounded.
6. The 485-interface-equipped electric operating mechanism according to claim 4, wherein: the 5V power supply circuit is connected in parallel between a pin 1 and a pin 2 of a transformer T1, and the 5V power supply circuit consists of a three-terminal integrated voltage regulator U5, a diode D6, a capacitor C18 and a capacitor C17;
the anode of the diode D6 is connected with a pin 1 of the transformer T1, the cathode of the diode D6 is connected with a pin 3 of the three-terminal integrated voltage stabilizer U5, a pin 2 of the three-terminal integrated voltage stabilizer U5 is connected with a pin 2 of the transformer T1, a capacitor C17 is connected between the pin 2 and the pin 3 of the three-terminal integrated voltage stabilizer U5 in parallel, a capacitor C18 is connected between the pin 2 and the pin 1 of the three-terminal integrated voltage stabilizer U5 in parallel, and the pin 1 of the three-terminal integrated voltage stabilizer U5 is also connected with the 485 communication circuit.
7. The 485-interface-equipped electric operating mechanism according to claim 1, wherein: the switching power supply circuit also comprises an independent 5V power supply circuit, the independent 5V power supply circuit supplies power for the MCU circuit, and the independent 5V power supply circuit consists of a three-terminal integrated voltage stabilizer U6, a capacitor C15 and a capacitor C16; a capacitor C16 is connected between a pin 1 and a pin 2 of the three-terminal integrated voltage stabilizer U6 in parallel, a capacitor C15 is connected between a pin 3 and a pin 2 of the three-terminal integrated voltage stabilizer U6 in parallel, a pin 1 of the three-terminal integrated voltage stabilizer U6 is grounded, a pin 1 of the three-terminal integrated voltage stabilizer U6 is connected with the MCU circuit, and a pin 3 of the three-terminal integrated voltage stabilizer U6 is connected with a negative electrode of a diode D5.
8. The 485-interface-equipped electric operating mechanism according to claim 1, wherein: the MCU circuit comprises an STC single chip microcomputer, a capacitor C20 and a capacitor C21; and the capacitor C20 and the capacitor C21 are connected in parallel and then connected between a pin 2 and a pin 4 of the STC single chip microcomputer, the pin 2 of the STC single chip microcomputer is connected with the independent 5V power circuit, and the pin 4 of the STC single chip microcomputer is grounded.
9. The 485-interface-equipped electric operating mechanism according to claim 1, wherein: the motor driving circuit comprises a direct current motor driving chip U4, a resistor R4, a resistor R28, a resistor R29, a resistor R30, a resistor R31, a capacitor C22, a capacitor C23, a capacitor C24, a capacitor C25 and a three-terminal integrated voltage stabilizer U9; pin 6 and pin 1 of the dc motor driving chip U4 are connected to each other, pin 6 and pin 5 of the dc motor driving chip U4 are connected to each other, a capacitor C22 is also connected in series between pin 6 and pin 5 of the dc motor driving chip U4, capacitor C23 is connected in parallel to both sides of capacitor C22, one end of capacitor C23 is connected to a 24V power supply circuit, resistor R4 is connected in series with pin 7 of the dc motor driving chip U4, pin 5, pin 6, pin 7 and pin 1 of the dc motor driving chip U4 are grounded together, resistor R31 is connected in series with pin 3 of the dc motor driving chip U4 and then connected to a VCC power supply, pin 4 of the dc motor driving chip U4 is connected in series with capacitor C25 and then grounded, resistor R29 is connected in series with resistor R30, capacitor C24 is connected in parallel to both ends of resistor R29 and resistor R30, a ground terminal of an integrated resistor U9 is connected between resistor R29 and a terminal R30, a three terminal of the integrated resistor U9 is connected to an input terminal of the dc motor driving chip 4, the output end of the three-terminal integrated voltage stabilizer U9 is grounded with a resistor R30 and a capacitor C24, one end of the resistor R28 is connected with VCC, and the other end of the resistor R28 is connected with a resistor R29;
the motor driving circuit further comprises a motor driving circuit, and the motor driving circuit comprises a high-load switch CN2, a high-load switch CN3, a direct-current motor M1, a resistor R25, a resistor R26, a resistor R27, a manual automatic change-over switch S1, a closing switch S2 and a breaking switch S3; the direct current motor M1 is connected in parallel between a pin 1 and a pin 5 of a high load switch CN3, a resistor R25 is connected in series with a pin 3 of the high load switch CN3, a resistor R26 is connected in series with a pin 4 of the high load switch CN3, a resistor R27 is connected in series with a pin 2 of the high load switch CN2, unconnected terminals of the resistor R25, the resistor R26 and the resistor R27 are connected with each other and connected with an independent 5V power circuit, a pin 2 of the high load switch CN2 is grounded, a manual automatic switch S1 and a closing switch S2 are respectively connected in series with the high load switch CN3, unconnected terminals of the manual automatic switch S1 and the closing switch S2 are grounded together, and the opening switch S3 and the high load switch CN2 are connected in series with each other.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210014044.4A CN114400171A (en) | 2022-01-06 | 2022-01-06 | Electric operating mechanism with 485 interface |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210014044.4A CN114400171A (en) | 2022-01-06 | 2022-01-06 | Electric operating mechanism with 485 interface |
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