Electronic controller and control and protection switching device using same

Abstract

The invention relates to the technical field of motor automatic control, and discloses an electronic controller and a control and protection switching device applying the electronic controller. A main control module in the electronic controller is respectively connected with a temperature sampling module, an electric leakage sampling module, a three-phase current sampling module, a three-phase voltage sampling module, a display and keyboard module, an electric leakage test module, a user-defined function input module, an analog quantity output module and a user-defined function output module. By integrating a plurality of functional modules, the electronic controller is more complete in protection function, high in adaptability and capable of meeting diversified requirements of users.

Description

Technical Field

[0001] The present invention relates to the technical field of motor automatic control, and in particular to an electronic controller and a control and protection switch electrical appliance using the electronic controller. Background Art

[0002] Control and protection switchgear is an important equipment widely used in industrial production and power transmission. At present, the mainstream CPS control and protection switchgear products on the market have relatively monotonous functions, cannot be changed, and have a relatively fixed application market, making it difficult to expand outward. Summary of the invention

[0003] In view of this, the present invention provides an electronic controller and a control and protection switch electrical appliance using the electronic controller to solve the problem that the mainstream CPS control and protection switch electrical appliances on the market currently have relatively monotonous functions, cannot be adapted, have a relatively fixed application market, and are difficult to expand outward.

[0004] In a first aspect, the present invention provides an electronic controller, which includes: a main control module, an analog output module, a temperature sampling module, a leakage sampling module, a three-phase current sampling module, a three-phase voltage sampling module, a display and keyboard module, a leakage test module, a custom function input module and a custom function output module, wherein:

[0005] The main control module is respectively connected to the temperature sampling module, the leakage sampling module, the three-phase current sampling module, the three-phase voltage sampling module, the display and keyboard module, the leakage test module, the custom function input module, the analog output module and the custom function output module;

[0006] The main control module generates a protection control signal based on the signal input from the keyboard, the signal input from the custom function input module, and the collected temperature, leakage current, three-phase current, and three-phase voltage, and outputs the protection control signal through the analog output module or the custom function output module, thereby driving the control and protection switch electrical appliance to perform a protection action.

[0007] An electronic controller provided by the present invention integrates multiple functional modules such as an analog output module, a temperature sampling module, a leakage sampling module, a three-phase current sampling module, a three-phase voltage sampling module, a display and keyboard module, a leakage test module, a custom function input module and a custom function output module, so that the electronic controller has more complete protection functions and strong adaptability, and can meet the diverse needs of users.

[0008] In an optional implementation, the custom function input module includes multiple custom function input circuits, each custom function input circuit includes: a first resistor, a second resistor, a third resistor, a first capacitor, a second capacitor and a first photocoupler, wherein:

[0009] One end of the first resistor is connected to the input signal, the other end of the first resistor is respectively connected to one end of the first capacitor and the first end of the first photocoupler, and the other end of the first capacitor is connected to the second end of the first photocoupler and connected to the analog ground;

[0010] The third end of the first photoelectric coupler is respectively connected to one end of the second resistor, one end of the third resistor and one end of the second capacitor, and the fourth end of the first photoelectric coupler is connected to the other end of the second capacitor and then grounded;

[0011] The other end of the second resistor is connected to the main control module, and the other end of the third resistor is connected to a DC power supply.

[0012] In an optional implementation, the custom function output unit includes multiple custom function output circuits, each custom function output circuit includes: a fourth resistor, a fifth resistor, a first transistor, a second photocoupler, a first diode and a first relay, wherein:

[0013] One end of the fourth resistor is connected to the main control module, the other end of the fourth resistor is connected to the base of the first transistor, and the emitter of the first transistor is grounded;

[0014] The first end of the second photoelectric coupler is connected to a DC power supply through a fifth resistor, the second end of the second photoelectric coupler is connected to the collector of the first transistor, the third end of the second photoelectric coupler is respectively connected to one end of the coil in the first relay and the anode of the first diode, and the fourth end of the second photoelectric coupler is connected to an analog ground;

[0015] The other end of the coil in the first relay is connected to the DC power supply and the cathode of the first diode respectively, and the switch in the first relay is connected in series in the protection circuit of the controlled device.

[0016] In an optional implementation, the three-phase current sampling module includes: an A-phase current sampling circuit, a B-phase current sampling circuit, and a C-phase current sampling circuit, wherein each phase current sampling circuit includes: a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a third capacitor, a fourth capacitor, a fifth capacitor, a first operational amplifier, and a second operational amplifier, wherein,

[0017] One end of the sixth resistor is respectively connected to each phase current, one end of the third capacitor and one end of the seventh resistor, the other end of the sixth resistor is connected to the non-inverting input end of the first operational amplifier, and the other end of the third capacitor is connected to the analog ground;

[0018] The inverting input terminal of the first operational amplifier is respectively connected to the output terminal of the first operational amplifier, one end of the eighth resistor and one end of the ninth resistor;

[0019] The other end of the eighth resistor is connected to one end of the fourth capacitor and the main control module respectively, and the other end of the fourth capacitor is connected to the analog ground;

[0020] The non-inverting input terminal of the second operational amplifier is connected to the other end of the ninth resistor, the inverting input terminal of the second operational amplifier is respectively connected to one end of the tenth resistor and one end of the eleventh resistor, and the output terminal of the second operational amplifier is respectively connected to the other end of the eleventh resistor and one end of the twelfth resistor;

[0021] The other end of the tenth resistor is respectively connected to the other end of the seventh resistor and the reference voltage, the other end of the twelfth resistor is respectively connected to one end of the fifth capacitor and the main control module, and the other end of the fifth capacitor is connected to the analog ground.

[0022] In an optional embodiment, the three-phase voltage sampling module includes: an AB line voltage sampling circuit, a BC line voltage sampling circuit and a CA line voltage sampling circuit, wherein each line voltage sampling circuit includes: a voltage conversion unit and an amplification unit, wherein the first end of the voltage conversion unit is connected to the three-phase voltage, the second end of the voltage conversion unit is connected to the first end of the amplification unit, and the second end of the amplification unit is connected to the main control module.

[0023] In an optional implementation, the voltage conversion unit includes: a first voltage transformer, a sixth capacitor, a seventh capacitor, a first voltage stabilizing diode and a thirteenth resistor, wherein:

[0024] The first end of the first voltage transformer is respectively connected to one end of the sixth capacitor and any one phase voltage, the second end of the first voltage transformer is respectively connected to the other end of the sixth capacitor and any one phase voltage of the remaining two phases, the third end of the first voltage transformer is respectively connected to the main control module and one end of the thirteenth resistor, the fourth end of the first voltage transformer is respectively connected to the cathode of the first voltage transformer, the other end of the thirteenth resistor, one end of the seventh capacitor and a reference voltage, and the anode of the first voltage transformer and the other end of the seventh capacitor are both grounded.

[0025] In an optional implementation, the amplification unit includes: a second voltage stabilizing diode, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor and a third operational amplifier, wherein:

[0026] The non-inverting input terminal of the third operational amplifier is connected to the reference voltage, the inverting input terminal of the third operational amplifier is respectively connected to one end of the fourteenth resistor and one end of the fifteenth resistor, the output terminal of the third operational amplifier is respectively connected to the other end of the fifteenth resistor and one end of the sixteenth resistor, the other end of the sixteenth resistor is connected to the main control module, the other end of the fourteenth resistor is respectively connected to the cathode of the second voltage zener diode and the conversion unit, and the anode of the second voltage zener diode is connected to the analog ground.

[0027] In an optional implementation, the leakage sampling module includes: a first diode, a second diode, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, a twenty-fourth resistor, a twenty-fifth resistor, a fourth operational amplifier, a fifth operational amplifier, an eighth capacitor, a ninth capacitor, a tenth capacitor, and an eleventh capacitor; the leakage testing module includes: a twenty-sixth resistor, a twenty-seventh resistor, a twenty-eighth resistor, a twenty-ninth resistor, a twelfth capacitor, a thirteenth capacitor, and a sixth operational amplifier, wherein:

[0028] The non-inverting input terminal of the fourth operational amplifier is connected to one end of the seventeenth resistor, the inverting input terminal of the fourth operational amplifier is respectively connected to one end of the eighteenth resistor and one end of the nineteenth resistor, the output terminal of the fourth operational amplifier is respectively connected to the other end of the nineteenth resistor and one end of the twentieth resistor, the other end of the seventeenth resistor is respectively connected to the leakage current, the cathode of the first diode, the anode of the second diode, one end of the twenty-first resistor, one end of the eighth capacitor and one end of the twenty-second resistor, the other end of the twentieth resistor is respectively connected to one end of the tenth capacitor and the main control module, the anode of the first diode, the cathode of the second diode, the other end of the twenty-first resistor, the other end of the eighth capacitor, the other end of the eighteenth resistor and the other end of the tenth capacitor are all connected to the analog ground;

[0029] The non-inverting input terminal of the fifth operational amplifier is connected to the other end of the twenty-second resistor, the inverting input terminal of the fifth operational amplifier is respectively connected to one end of the twenty-third resistor and one end of the twenty-fourth resistor, the output terminal of the fifth operational amplifier is respectively connected to one end of the twenty-fifth resistor and the other end of the twenty-fourth resistor, the other end of the twenty-third resistor is connected to the analog ground, the other end of the twenty-fifth resistor is respectively connected to one end of the eleventh capacitor and the main control module, and the other end of the eleventh capacitor is connected to the analog ground;

[0030] The non-inverting input terminal of the sixth operational amplifier is respectively connected to one end of the twenty-sixth resistor, one end of the twenty-seventh resistor and one end of the twelfth capacitor, the inverting input terminal of the sixth operational amplifier is respectively connected to the output terminal of the sixth operational amplifier and one end of the twenty-ninth resistor, the other end of the twenty-ninth resistor is connected to the main control module, the other end of the twenty-sixth resistor is respectively connected to one end of the twenty-eighth resistor and one end of the thirteenth capacitor, one end of the twenty-eighth resistor is connected to the main control module, and the other end of the thirteenth capacitor, the other end of the twenty-sixth resistor and the other end of the twelfth capacitor are connected to the analog ground.

[0031] In an optional implementation, the analog output module includes: a 30th resistor, a 31st resistor, a 32nd resistor, a 33rd resistor, a second transistor, a third transistor, a third photocoupler, a 12th capacitor, a 13th capacitor, a 14th capacitor and a current conversion chip, wherein:

[0032] The first end of the third photoelectric coupler is connected to the collector of the second triode, the second end of the third photoelectric coupler is connected to one end of the thirtieth resistor, the third end of the third photoelectric coupler is respectively connected to one end of the thirty-first resistor and one end of the thirty-second resistor, the fourth end of the third photoelectric coupler is respectively connected to one end of the twelfth capacitor and the eighth pin of the current conversion chip, the base of the second triode is connected to the main control module through the thirty-third resistor, the emitter of the second triode is connected to a DC power supply, the other end of the thirtieth resistor is grounded, and the other end of the thirty-first resistor and the other end of the twelfth capacitor are connected to an analog ground;

[0033] The second pin of the current conversion chip is respectively connected to one end of the thirteenth capacitor, one end of the fourteenth capacitor and the other end of the thirty-second resistor, the third pin of the current conversion chip is connected to the analog ground, the fourth pin of the current conversion chip serves as the analog output terminal, the fifth pin of the current conversion chip is connected to the emitter of the third transistor, the sixth pin of the current conversion chip is connected to the base of the third transistor, the seventh pin of the current conversion chip is respectively connected to the collector of the third transistor and a DC power supply, and the other end of the thirteenth capacitor and the other end of the fourteenth capacitor are both connected to the analog ground.

[0034] In a second aspect, the present invention provides a control and protection switch appliance using an electronic controller, including the electronic controller of the above-mentioned first aspect or any corresponding embodiment thereof.

[0035] The present invention provides a control and protection switch electrical appliance using an electronic controller. By adopting the above-mentioned electronic controller, multiple functional modules such as an analog output module, a temperature sampling module, a leakage sampling module, a three-phase current sampling module, a three-phase voltage sampling module, a display and keyboard module, a leakage test module, a custom function input module and a custom function output module are integrated, so that the protection function of the control and protection switch electrical appliance is more complete, the adaptability is strong, and it can meet the diverse needs of users. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 is a principle block diagram of an electronic controller according to an embodiment of the present invention;

[0038] Figure 2 is a circuit diagram of a custom function input according to an embodiment of the present invention;

[0039] Figure 3 is a circuit diagram of a custom function output according to an embodiment of the present invention;

[0040] Figure 4 is a C-phase current sampling circuit diagram according to an embodiment of the present invention;

[0041] Figure 5 is a circuit diagram of an AB line voltage sampling circuit according to an embodiment of the present invention;

[0042] Figure 6is a circuit diagram of a leakage sampling module according to an embodiment of the present invention;

[0043] Figure 7 is a circuit diagram of a leakage test module according to an embodiment of the present invention;

[0044] Figure 8 is a circuit diagram of an analog output module according to an embodiment of the present invention;

[0045] Fig. 9 is a circuit diagram of a frequency detection module according to an embodiment of the present invention;

[0046] Fig.10 is a circuit diagram of a first communication module according to an embodiment of the present invention;

[0047] Fig.11 is a circuit diagram of a first communication module according to an embodiment of the present invention. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0049] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0050] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can also be the internal connection of two components, it can be a wireless connection, or it can be a wired connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0052] The present invention provides an electronic controller for use in controlling and protecting switchgear. Figure 1 As shown, it includes: a main control module, an analog output module, a temperature sampling module, a leakage sampling module, a three-phase current sampling module, a three-phase voltage sampling module, a display and keyboard module, a leakage test module, a custom function input module and a custom function output module. Among them, the main control module is respectively connected with the temperature sampling module, the leakage sampling module, the three-phase current sampling module, the three-phase voltage sampling module, the display and keyboard module, the leakage test module, the custom function input module, the analog output module and the custom function output module.

[0053] Specifically, the main control module generates a protection control signal based on the signal input from the keyboard, the signal input from the custom function input module, and the collected temperature, leakage current, three-phase current, and three-phase voltage, and outputs the protection control signal through the analog output module or the custom function output module, thereby driving the control and protection switching electrical appliances to perform protection actions.

[0054] An electronic controller provided by the present invention integrates multiple functional modules such as an analog output module, a temperature sampling module, a leakage sampling module, a three-phase current sampling module, a three-phase voltage sampling module, a display and keyboard module, a leakage test module, a custom function input module and a custom function output module, so that the electronic controller has more complete protection functions and strong adaptability, and can meet the diverse needs of users.

[0055] In an optional implementation, the custom function input module includes multiple custom function input circuits. Figure 2 As shown, each custom function input circuit includes: a first resistor R16, a second resistor R161, a third resistor R162, a first capacitor C20, a second capacitor C22 and a first photocoupler U5A. Among them, one end of the first resistor R16 is connected to the input signal, the other end of the first resistor R16 is respectively connected to one end of the first capacitor C20 and the first end of the first photocoupler U5A, and the other end of the first capacitor C20 is connected to the second end of the first photocoupler U5A and connected to the analog ground. The third end of the first photocoupler U5A is respectively connected to one end of the second resistor R161, one end of the third resistor R162 and one end of the second capacitor C22, and the fourth end of the first photocoupler U5A is connected to the other end of the second capacitor C22 and then grounded GND. The other end of the second resistor R161 is connected to the main control module, and the other end of the third resistor R162 is connected to a 3.3V DC power supply.

[0056] Specifically, the signals collected by the custom function input circuit can be customized according to user needs. The custom function input circuit filters, smoothes, and electrically isolates the collected signals and then inputs them into the main control module. In an embodiment of the present invention, the custom function input module includes 8 custom function input circuits, which is only an example and is not limited to this.

[0057] In an optional implementation, the custom function output unit includes multiple custom function output circuits. Figure 3 As shown, each customized function output circuit includes: a fourth resistor R26, a fifth resistor R28, a first transistor Q1, a second photocoupler U20, a first diode D4 and a first relay KA3. Among them, one end of the fourth resistor R26 is connected to the main control module, the other end of the fourth resistor R26 is connected to the base of the first transistor Q1, and the emitter of the first transistor Q1 is grounded. The first end of the second photocoupler U20 is connected to the 3.3V DC power supply through the fifth resistor R28, the second end of the second photocoupler U20 is connected to the collector of the first transistor Q1, the third end of the second photocoupler U20 is respectively connected to one end of the coil in the first relay KA3 and the anode of the first diode D4, and the fourth end of the second photocoupler U20 is connected to the analog ground. The other end of the coil in the first relay KA3 is respectively connected to the 24V DC power supply and the cathode of the first diode D4, and the switch in the first relay KA3 is connected in series in the protection circuit of the controlled device. Among them, the switch in the first relay KA3 is connected in series in the protection circuit of the controlled device through the DOO3 and COM2 interfaces.

[0058] Specifically, the signal output by the custom function output circuit can be customized according to user needs. The custom function output circuit sends the signal output by the main control module to the first relay KA3. The first relay KA3 performs a switch operation according to the signal, thereby controlling the protection circuit action of the controlled device. In the embodiment of the present invention, the defined function output module includes 4 defined function output circuits, which is only taken as an example and is not limited to this.

[0059] In an optional implementation, the three-phase current sampling module includes: a current sampling circuit for phase A, a current sampling circuit for phase B, and a current sampling circuit for phase C. Each current sampling circuit is the same. Figure 4 The C-phase current sampling circuit shown in the figure is used as an example for explanation. Figure 4 As shown, the C-phase current sampling circuit includes: a sixth resistor R63, a seventh resistor R78, an eighth resistor R64, a ninth resistor R70, a tenth resistor R180, an eleventh resistor R181, a twelfth resistor R74, a third capacitor C21, a fourth capacitor C24, a fifth capacitor C27, a first operational amplifier U23A and a second operational amplifier U23B.

[0060] Among them, one end of the sixth resistor R63 is respectively connected to each phase current, one end of the third capacitor C21 and one end of the seventh resistor R78, the other end of the sixth resistor R63 is connected to the in-phase input end of the first operational amplifier U23A, and the other end of the third capacitor C21 is connected to the analog ground. The inverting input end of the first operational amplifier U23A is respectively connected to the output end of the first operational amplifier U23A, one end of the eighth resistor R64 and one end of the ninth resistor R70. The other end of the eighth resistor R64 is respectively connected to one end of the fourth capacitor C24 and the main control module, and the other end of the fourth capacitor C24 is connected to the analog ground. The in-phase input end of the second operational amplifier U23B is connected to the other end of the ninth resistor R70, the inverting input end of the second operational amplifier U23B is respectively connected to one end of the tenth resistor R180 and one end of the eleventh resistor R181, and the output end of the second operational amplifier U23B is respectively connected to the other end of the eleventh resistor R181 and one end of the twelfth resistor R74. The other end of the tenth resistor R180 is connected to the other end of the seventh resistor R78 and the reference voltage REF_1.6V respectively. The other end of the twelfth resistor R74 is connected to one end of the fifth capacitor C27 and the main control module respectively. The other end of the fifth capacitor C27 is connected to the analog ground.

[0061] Specifically, the A-phase current sampling circuit is provided with two operational amplifiers. After the A-phase current is processed by the first-stage operational amplifier, the high-speed current signal IAO0 is transmitted to the main control module; after the A-phase current is processed by the first-stage operational amplifier and the second-stage operational amplifier, the low-speed current signal IAO is transmitted to the main control module. The B-phase current sampling circuit is provided with two operational amplifiers. After the B-phase current is processed by the first-stage operational amplifier, the high-speed current signal IBO0 is transmitted to the main control module; after the B-phase current is processed by the first-stage operational amplifier and the second-stage operational amplifier, the low-speed current signal IBO is transmitted to the main control module. The C-phase current sampling circuit is provided with two operational amplifiers. After the C-phase current is processed by the first operational amplifier U23A, the high-speed current signal ICO0 is transmitted to the main control module; after the C-phase current is processed by the first operational amplifier U23A and the second operational amplifier U23B, the low-speed current signal ICO is transmitted to the main control module. In addition, the IE signal branch is used to detect whether the three-phase current is grounded. When the IE signal is 0, there is no ground fault.

[0062] In an optional implementation, the three-phase voltage sampling module includes: an AB line voltage sampling circuit, a BC line voltage sampling circuit, and a CA line voltage sampling circuit, wherein each line voltage sampling circuit includes: a voltage conversion unit and an amplification unit. The first end of the voltage conversion unit is connected to the three-phase voltage, the second end of the voltage conversion unit is connected to the first end of the amplification unit, and the second end of the amplification unit is connected to the main control module.

[0063] Specifically, the conversion unit and the amplification unit in each line voltage sampling circuit are the same. Figure 5 The AB line voltage conversion unit and the AB line voltage amplification unit in the AB line voltage sampling circuit shown in FIG. Figure 5 As shown, the AB line voltage conversion unit includes: a first voltage transformer U30, a sixth capacitor C45, a seventh capacitor C48, a first voltage transformer VD1 and a thirteenth resistor R212. Among them, the first end of the first voltage transformer U30 is respectively connected to one end of the sixth capacitor C45 and the A phase voltage, the second end of the first voltage transformer U30 is respectively connected to the other end of the sixth capacitor C45 and the B phase voltage, the third end of the first voltage transformer U30 is respectively connected to the AB line voltage amplification unit and one end of the thirteenth resistor R212, the fourth end of the first voltage transformer U30 is respectively connected to the cathode of the first voltage transformer VD1, the other end of the thirteenth resistor R212, one end of the seventh capacitor C48 and the reference voltage REF_1.6V, and the anode of the first voltage transformer VD1 and the other end of the seventh capacitor C48 are both connected to the analog ground.

[0064] Furthermore, the AB line voltage amplification unit includes: a second voltage stabilizing diode VD10, a fourteenth resistor R214, a fifteenth resistor R184, a sixteenth resistor R217 and a third operational amplifier U25A. Among them, the non-inverting input terminal of the third operational amplifier U25A is connected to the reference voltage REF_1.6V, the inverting input terminal of the third operational amplifier U25A is respectively connected to one end of the fourteenth resistor R214 and one end of the fifteenth resistor R184, the output terminal of the third operational amplifier U25A is respectively connected to the other end of the fifteenth resistor R184 and one end of the sixteenth resistor R217, the other end of the sixteenth resistor R217 is connected to the main control module, the other end of the fourteenth resistor R214 is respectively connected to the cathode of the second voltage stabilizing diode VD10 and the AB line voltage conversion unit, and the anode of the second voltage stabilizing diode VD10 is connected to the analog ground.

[0065] Specifically, the first end and the second end of the voltage transformer in the AB line voltage conversion unit are connected to the A phase voltage and the B phase voltage respectively; the first end and the second end of the voltage transformer in the BC line voltage conversion unit are connected to the B phase voltage and the C phase voltage respectively; the first end and the second end of the voltage transformer in the CA line voltage conversion unit are connected to the C phase voltage and the A phase voltage respectively. The AB line voltage is converted in the AB line voltage conversion unit, and then the AB line voltage is amplified in the AB line voltage amplification unit to obtain the AB line voltage, and finally the AB line voltage is transmitted to the main control module. Similarly, the BC line voltage is converted in the BC line voltage conversion unit, and then the BC line voltage amplification unit is amplified to obtain the BC line voltage, and finally the BC line voltage is transmitted to the main control module. The CA line voltage is converted in the CA line voltage conversion unit, and then the CA line voltage amplification unit is amplified to obtain the CA line voltage, and finally the CA line voltage is transmitted to the main control module.

[0066] In an optional embodiment, if Figure 6 As shown, the leakage sampling module includes: a first diode D24, a second diode D25, a seventeenth resistor R2, an eighteenth resistor R3, a nineteenth resistor R4, a twentieth resistor R5, a twenty-first resistor R1, a twenty-second resistor R6, a twenty-third resistor R7, a twenty-fourth resistor R8, a twenty-fifth resistor R9, a fourth operational amplifier U26A, a fifth operational amplifier U26B, an eighth capacitor C1, a ninth capacitor, a tenth capacitor C3, and an eleventh capacitor C5.

[0067] Among them, the non-inverting input terminal of the fourth operational amplifier U26A is connected to one end of the seventeenth resistor R2, the inverting input terminal of the fourth operational amplifier U26A is respectively connected to one end of the eighteenth resistor R3 and one end of the nineteenth resistor R4, the output terminal of the fourth operational amplifier U26A is respectively connected to the other end of the nineteenth resistor R4 and one end of the twentieth resistor R5, the other end of the seventeenth resistor R2 is respectively connected to the leakage current EL_IN, the cathode of the first diode D24, the anode of the second diode D25, one end of the twenty-first resistor R1, one end of the eighth capacitor C1 and one end of the twenty-second resistor R6, the other end of the twentieth resistor R5 is respectively connected to one end of the tenth capacitor C3 and the main control module, the anode of the first diode D24, the cathode of the second diode D25, the other end of the twenty-first resistor R1, the other end of the eighth capacitor C1, the other end of the eighteenth resistor R3 and the other end of the tenth capacitor C3 are all connected to the analog ground. The non-inverting input terminal of the fifth operational amplifier U26B is connected to the other end of the twenty-second resistor R6, the inverting input terminal of the fifth operational amplifier U26B is respectively connected to one end of the twenty-third resistor R7 and one end of the twenty-fourth resistor R8, the output terminal of the fifth operational amplifier U26B is respectively connected to one end of the twenty-fifth resistor R9 and the other end of the twenty-fourth resistor R8, the other end of the twenty-third resistor R7 is connected to the analog ground, the other end of the twenty-fifth resistor R9 is respectively connected to one end of the eleventh capacitor C5 and the main control module, and the other end of the eleventh capacitor C5 is connected to the analog ground.

[0068] Specifically, the leakage current sampling module is provided with two operational amplifiers. The leakage current is processed by the fourth operational amplifier U26A and the high-level current signal EL0 is transmitted to the main control module; the leakage current is processed by the fourth operational amplifier U26A and the fifth operational amplifier U26B and the low-level current signal EL is transmitted to the main control module.

[0069] In an optional embodiment, if Figure 7 As shown, the leakage test module includes: a twenty-sixth resistor R11, a twenty-seventh resistor R12, a twenty-eighth resistor R10, a twenty-ninth resistor R13, a twelfth capacitor C7, a thirteenth capacitor C6 and a sixth operational amplifier U26C. Among them, the in-phase input end of the sixth operational amplifier U26C is respectively connected to one end of the twenty-sixth resistor R11, one end of the twenty-seventh resistor R12 and one end of the twelfth capacitor C7, the inverting input end of the sixth operational amplifier U26C is respectively connected to the output end of the sixth operational amplifier U26C and one end of the twenty-ninth resistor R13, the other end of the twenty-ninth resistor R13 is connected to the main control module, the other end of the twenty-sixth resistor R11 is respectively connected to one end of the twenty-eighth resistor R10 and one end of the thirteenth capacitor C6, one end of the twenty-eighth resistor R10 is connected to the main control module, and the other end of the thirteenth capacitor C6, the other end of the twenty-sixth resistor R11 and the other end of the twelfth capacitor C7 are connected to the analog ground.

[0070] Specifically, when performing a leakage test, the main control module sends a leakage test signal EL_TEST_IN to the leakage test module. The leakage test module processes the leakage test signal EL_TEST_IN and transmits it to the leakage test circuit.

[0071] In an optional embodiment, if Figure 8 As shown, the analog output module includes: a 30th resistor R18, a 31st resistor R19, a 32nd resistor R20, a 33rd resistor R17, a second transistor Q3, a third transistor Q4, a third photocoupler U40, a twelfth capacitor C10, a thirteenth capacitor C11, a fourteenth capacitor C12 and a current conversion chip U2.

[0072] Among them, the first end of the third photocoupler U40 is connected to the collector of the second transistor Q3, the second end of the third photocoupler U40 is connected to one end of the thirtieth resistor R18, the third end of the third photocoupler U40 is respectively connected to one end of the thirty-first resistor R19 and one end of the thirty-second resistor R20, the fourth end of the third photocoupler U40 is respectively connected to one end of the twelfth capacitor C10 and the eighth pin of the current conversion chip U2, the base of the second transistor Q3 is connected to the main control module through the thirty-third resistor R17, the emitter of the second transistor Q3 is connected to the 3.3V DC power supply, the other end of the thirtieth resistor R18 is grounded GND, and the other end of the thirty-first resistor R19 and the other end of the twelfth capacitor C10 are connected to the analog ground. The second pin of the current conversion chip U2 is respectively connected to one end of the thirteenth capacitor C11, one end of the fourteenth capacitor C12 and the other end of the thirty-second resistor R20, the third pin of the current conversion chip U2 is connected to the analog ground, the fourth pin of the current conversion chip U2 is used as the analog output end, the fifth pin of the current conversion chip U2 is connected to the emitter of the third transistor Q4, the sixth pin of the current conversion chip U2 is connected to the base of the third transistor Q4, the seventh pin of the current conversion chip U2 is respectively connected to the collector of the third transistor Q4 and the 24V DC power supply, the other end of the thirteenth capacitor C11 and the other end of the fourteenth capacitor C12 are both connected to the analog ground.

[0073] Specifically, the digital signal output by the main control module is converted into a 4-20MA analog signal and then output after being subjected to digital-to-analog conversion, electrical isolation, filtering, and smoothing in the analog output module.

[0074] In an optional embodiment, the electronic controller further includes: a frequency detection module. Fig. 9As shown, the frequency detection module includes a thirty-fourth resistor R30, a thirty-fifth resistor R31, a thirty-sixth resistor R32, a thirty-seventh resistor R33, a thirty-eighth resistor 34 and a seventh operational amplifier U51A. The in-phase input terminal of the seventh operational amplifier U51A is respectively connected to one end of the thirty-seventh resistor R33 and one end of the thirty-sixth resistor R32, the inverting input terminal of the seventh operational amplifier U51A is connected to one end of the thirty-eighth resistor 34, the output terminal of the seventh operational amplifier U51A is connected to one end of the thirty-fifth resistor R31; the other end of the thirty-seventh resistor R33 is connected to the Figure 5 The other end of the thirty-eighth resistor 34 is connected to Ua1 in Figure 5 The other end of the thirty-sixth resistor R32 is connected to the other end of the thirty-fifth resistor R31 and the main control module through the thirty-fourth resistor R30.

[0075] In an optional embodiment, the electronic controller further includes: a first communication module and a second communication module. Fig.10As shown, the first communication module includes: a first communication chip U1, a thirty-ninth resistor R21, a fortieth resistor R22, a forty-first resistor R23, a forty-second resistor R24, a forty-third resistor 25, a fifteenth capacitor C15, a sixteenth capacitor C16, a first common-mode inductor T1, a first TVS tube D1, a second TVS tube D2 and a third TVS tube D3, wherein the VDD1 pin of the first communication chip U1 is respectively connected to a 3.3V power supply, one end of the thirty-ninth resistor R21 and one end of the fifteenth capacitor C15, the other end of the thirty-ninth resistor R21 is connected to the PV pin of the first communication chip U1, and the other end of the fifteenth capacitor C15 is grounded. The VDD2 pin of the first communication chip U1 is respectively connected to a 5V power supply and one end of the sixteenth capacitor C16, and the other end of the sixteenth capacitor C16 is grounded. The GND1 pin and the GND2 pin of the first communication chip U1 are grounded. The RXD pin of the first communication chip U1 is connected to the RX1 pin of the main control module through the 485 bus, the RE pin and DE pin of the first communication chip U1 are connected to the RE / DE1 pin of the main control module through the 485 bus, the TXD pin of the first communication chip U1 is connected to the TX1 pin of the main control module through the 485 bus, the A pin of the first communication chip U1 is respectively connected to one end of the 41st resistor R23, one end of the 43rd resistor 25 and the fourth end of the first common mode inductor T1, and the other end of the 41st resistor R23 is connected to the 5V power supply. The B pin of the first communication chip U1 is respectively connected to one end of the 40th resistor R22, one end of the 42nd resistor R24 ​​and the third end of the first common mode inductor T1, and the other end of the 40th resistor R22 is grounded. The first end of the first common mode inductor T1 is respectively connected to one end of the first TVS tube D1, one end of the second TVS tube D2 and the B pin of the opposite device, and the other end of the first TVS tube D1 is grounded. The second end of the first common mode inductor T1 is respectively connected to one end of the third TVS tube D3, the other end of the second TVS tube D2 and the A pin of the opposite device, and the other end of the third TVS tube D3 is grounded.

[0076] like Fig.11As shown, the second communication module includes: a second communication chip IC1, a 44th resistor R236, a 45th resistor R237, a 46th resistor R238, a 47th resistor R239, a 17th capacitor C120, a 4th TVS tube D21 and a first common mode inductor T4. Among them, the RO pin of the second communication chip IC1 is connected to the RX2 pin of the main control module through the 485 bus, and the other end of the 44th resistor R233 is connected to the 3.3V power supply. The low-level effective RE pin and DE pin of the second communication chip IC1 are connected to the RE / DE2 pin of the main control module through the 485 bus. The DI pin of the second communication chip IC1 is connected to the TX2 pin of the main control module through the 485 bus. The VCC pin of the second communication chip IC1 is respectively connected to one end of the 17th capacitor C120 and the 3.3V power supply, and the other end of the 17th capacitor C120 is grounded. The low-level effective DO / RI in the second communication chip IC1 is respectively connected to the first end of the first common-mode inductor T4, one end of the forty-sixth resistor R238 and the second end of the fourth TVS tube D21 through the forty-fourth resistor R236. The high-level effective DO / RI in the second communication chip IC1 is respectively connected to the second end of the first common-mode inductor T4, one end of the forty-seventh resistor R239 and the first end of the fourth TVS tube D21 through the forty-fifth resistor R237, and the third end of the fourth TVS tube D21 is grounded. The third end of the first common-mode inductor T4 is respectively connected to the other end of the forty-sixth resistor R238 and the B2 pin of the opposite device. The fourth end of the first common-mode inductor T4 is respectively connected to the other end of the forty-seventh resistor R239 and the A2 pin of the opposite device. The present invention provides a control and protection switch electrical appliance using an electronic controller, including the electronic controller of the above embodiment.

[0077] Specifically, the present invention provides a control and protection switch electrical appliance using an electronic controller. By using the above electronic controller, multiple functional modules such as an analog output module, a temperature sampling module, a leakage sampling module, a three-phase current sampling module, a three-phase voltage sampling module, a display and keyboard module, a leakage test module, a custom function input module and a custom function output module are integrated, so that the protection function of the control and protection switch electrical appliance is more complete, the adaptability is strong, and it can meet the diverse needs of users. Furthermore, the above electronic controller can also be applied to other switch electrical appliances.

[0078] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. An electronic controller, characterized in that: The electronic controller includes: a main control module, an analog output module, a temperature sampling module, a leakage sampling module, a three-phase current sampling module, a three-phase voltage sampling module, a display and keyboard module, a leakage test module, a custom function input module and a custom function output module, wherein: The main control module is respectively connected to the temperature sampling module, the leakage sampling module, the three-phase current sampling module, the three-phase voltage sampling module, the display and keyboard module, the leakage test module, the custom function input module, the analog output module and the custom function output module; The main control module generates a protection control signal based on the signal input from the keyboard, the signal input from the custom function input module, and the collected temperature, leakage current, three-phase current, and three-phase voltage, and outputs the protection control signal through the analog output module or the custom function output module, thereby driving the control and protection switch electrical appliance to perform a protection action.

2. The electronic controller according to claim 1, characterized in that: The custom function input module includes multiple custom function input circuits, each of which includes: a first resistor, a second resistor, a third resistor, a first capacitor, a second capacitor and a first photoelectric coupler, wherein: One end of the first resistor is connected to the input signal, the other end of the first resistor is respectively connected to one end of the first capacitor and the first end of the first photocoupler, and the other end of the first capacitor is connected to the second end of the first photocoupler and connected to the analog ground; The third end of the first photoelectric coupler is respectively connected to one end of the second resistor, one end of the third resistor and one end of the second capacitor, and the fourth end of the first photoelectric coupler is connected to the other end of the second capacitor and then grounded; The other end of the second resistor is connected to the main control module, and the other end of the third resistor is connected to a DC power supply.

3. The electronic controller according to claim 1, characterized in that: The custom function output unit includes multiple custom function output circuits, each of which includes: a fourth resistor, a fifth resistor, a first transistor, a second photocoupler, a first diode and a first relay, wherein: One end of the fourth resistor is connected to the main control module, the other end of the fourth resistor is connected to the base of the first transistor, and the emitter of the first transistor is grounded; The first end of the second photoelectric coupler is connected to a DC power supply through a fifth resistor, the second end of the second photoelectric coupler is connected to the collector of the first transistor, the third end of the second photoelectric coupler is respectively connected to one end of the coil in the first relay and the anode of the first diode, and the fourth end of the second photoelectric coupler is connected to an analog ground; The other end of the coil in the first relay is connected to the DC power supply and the cathode of the first diode respectively, and the switch in the first relay is connected in series in the protection circuit of the controlled device.

4. The electronic controller according to claim 1, characterized in that: The three-phase current sampling module includes: an A-phase current sampling circuit, a B-phase current sampling circuit and a C-phase current sampling circuit, wherein each phase current sampling circuit includes: a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a third capacitor, a fourth capacitor, a fifth capacitor, a first operational amplifier and a second operational amplifier, wherein, One end of the sixth resistor is respectively connected to each phase current, one end of the third capacitor and one end of the seventh resistor, the other end of the sixth resistor is connected to the non-inverting input end of the first operational amplifier, and the other end of the third capacitor is connected to the analog ground; The inverting input terminal of the first operational amplifier is respectively connected to the output terminal of the first operational amplifier, one end of the eighth resistor and one end of the ninth resistor; The other end of the eighth resistor is connected to one end of the fourth capacitor and the main control module respectively, and the other end of the fourth capacitor is connected to the analog ground; The non-inverting input terminal of the second operational amplifier is connected to the other end of the ninth resistor, the inverting input terminal of the second operational amplifier is respectively connected to one end of the tenth resistor and one end of the eleventh resistor, and the output terminal of the second operational amplifier is respectively connected to the other end of the eleventh resistor and one end of the twelfth resistor; The other end of the tenth resistor is respectively connected to the other end of the seventh resistor and the reference voltage, the other end of the twelfth resistor is respectively connected to one end of the fifth capacitor and the main control module, and the other end of the fifth capacitor is connected to the analog ground.

5. The electronic controller according to claim 1, characterized in that: The three-phase voltage sampling module includes: an AB line voltage sampling circuit, a BC line voltage sampling circuit and a CA line voltage sampling circuit, wherein each line voltage sampling circuit includes: a voltage conversion unit and an amplification unit, wherein the first end of the voltage conversion unit is connected to the three-phase voltage, the second end of the voltage conversion unit is connected to the first end of the amplification unit, and the second end of the amplification unit is connected to the main control module.

6. The electronic controller according to claim 5, characterized in that: The voltage conversion unit includes: a first voltage transformer, a sixth capacitor, a seventh capacitor, a first voltage stabilizing diode and a thirteenth resistor, wherein: The first end of the first voltage transformer is respectively connected to one end of the sixth capacitor and any phase voltage, the second end of the first voltage transformer is respectively connected to the other end of the sixth capacitor and any phase voltage of the remaining two phases, the third end of the first voltage transformer is respectively connected to the amplification unit and one end of the thirteenth resistor, the fourth end of the first voltage transformer is respectively connected to the cathode of the first voltage transformer, the other end of the thirteenth resistor, one end of the seventh capacitor and a reference voltage, and the anode of the first voltage transformer and the other end of the seventh capacitor are both connected to analog ground.

7. The electronic controller according to claim 6, characterized in that: The amplification unit includes: a second voltage stabilizing diode, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor and a third operational amplifier, wherein: The non-inverting input terminal of the third operational amplifier is connected to the reference voltage, the inverting input terminal of the third operational amplifier is respectively connected to one end of the fourteenth resistor and one end of the fifteenth resistor, the output terminal of the third operational amplifier is respectively connected to the other end of the fifteenth resistor and one end of the sixteenth resistor, the other end of the sixteenth resistor is connected to the main control module, the other end of the fourteenth resistor is respectively connected to the cathode of the second voltage zener diode and the conversion unit, and the anode of the second voltage zener diode is connected to the analog ground.

8. The electronic controller according to claim 1, characterized in that: The leakage sampling module includes: a first diode, a second diode, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, a twenty-fourth resistor, a twenty-fifth resistor, a fourth operational amplifier, a fifth operational amplifier, an eighth capacitor, a ninth capacitor, a tenth capacitor, and an eleventh capacitor; the leakage testing module includes: a twenty-sixth resistor, a twenty-seventh resistor, a twenty-eighth resistor, a twenty-ninth resistor, a twelfth capacitor, a thirteenth capacitor, and a sixth operational amplifier, wherein: The non-inverting input terminal of the fourth operational amplifier is connected to one end of the seventeenth resistor, the inverting input terminal of the fourth operational amplifier is respectively connected to one end of the eighteenth resistor and one end of the nineteenth resistor, the output terminal of the fourth operational amplifier is respectively connected to the other end of the nineteenth resistor and one end of the twentieth resistor, the other end of the seventeenth resistor is respectively connected to the leakage current, the cathode of the first diode, the anode of the second diode, one end of the twenty-first resistor, one end of the eighth capacitor and one end of the twenty-second resistor, the other end of the twentieth resistor is respectively connected to one end of the tenth capacitor and the main control module, the anode of the first diode, the cathode of the second diode, the other end of the twenty-first resistor, the other end of the eighth capacitor, the other end of the eighteenth resistor and the other end of the tenth capacitor are all connected to the analog ground; The non-inverting input terminal of the fifth operational amplifier is connected to the other end of the twenty-second resistor, the inverting input terminal of the fifth operational amplifier is respectively connected to one end of the twenty-third resistor and one end of the twenty-fourth resistor, the output terminal of the fifth operational amplifier is respectively connected to one end of the twenty-fifth resistor and the other end of the twenty-fourth resistor, the other end of the twenty-third resistor is connected to the analog ground, the other end of the twenty-fifth resistor is respectively connected to one end of the eleventh capacitor and the main control module, and the other end of the eleventh capacitor is connected to the analog ground; The non-inverting input terminal of the sixth operational amplifier is respectively connected to one end of the twenty-sixth resistor, one end of the twenty-seventh resistor and one end of the twelfth capacitor, the inverting input terminal of the sixth operational amplifier is respectively connected to the output terminal of the sixth operational amplifier and one end of the twenty-ninth resistor, the other end of the twenty-ninth resistor is connected to the main control module, the other end of the twenty-sixth resistor is respectively connected to one end of the twenty-eighth resistor and one end of the thirteenth capacitor, one end of the twenty-eighth resistor is connected to the main control module, and the other end of the thirteenth capacitor, the other end of the twenty-sixth resistor and the other end of the twelfth capacitor are connected to the analog ground.

9. The electronic controller according to claim 1, characterized in that: The analog output module includes: a 30th resistor, a 31st resistor, a 32nd resistor, a 33rd resistor, a second transistor, a third transistor, a third photocoupler, a 12th capacitor, a 13th capacitor, a 14th capacitor and a current conversion chip, wherein: The first end of the third photoelectric coupler is connected to the collector of the second triode, the second end of the third photoelectric coupler is connected to one end of the thirtieth resistor, the third end of the third photoelectric coupler is respectively connected to one end of the thirty-first resistor and one end of the thirty-second resistor, the fourth end of the third photoelectric coupler is respectively connected to one end of the twelfth capacitor and the eighth pin of the current conversion chip, the base of the second triode is connected to the main control module through the thirty-third resistor, the emitter of the second triode is connected to a DC power supply, the other end of the thirtieth resistor is grounded, and the other end of the thirty-first resistor and the other end of the twelfth capacitor are connected to an analog ground; The second pin of the current conversion chip is respectively connected to one end of the thirteenth capacitor, one end of the fourteenth capacitor and the other end of the thirty-second resistor, the third pin of the current conversion chip is connected to the analog ground, the fourth pin of the current conversion chip serves as the analog output terminal, the fifth pin of the current conversion chip is connected to the emitter of the third transistor, the sixth pin of the current conversion chip is connected to the base of the third transistor, the seventh pin of the current conversion chip is respectively connected to the collector of the third transistor and a DC power supply, and the other end of the thirteenth capacitor and the other end of the fourteenth capacitor are both connected to the analog ground.

10. A control and protection switch appliance using an electronic controller, characterized in that: Comprising an electronic controller as claimed in any one of claims 1-9.

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