Electronic controller and control and protection switching device using same

Abstract

The utility model relates to the technical field of motor automatic control, and discloses an electronic controller and a control and protection switching device using the same. 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] This utility model relates to the field of automatic motor control technology, specifically to an electronic controller and a control and protection switch using the electronic controller. Background Technology

[0002] Control and protection switchgear is an important piece of equipment widely used in industrial production and power transmission. Currently, mainstream CPS control and protection switchgear products on the market have relatively simple functions, lack flexibility, and have a fixed application market, making it difficult to expand. Utility Model Content

[0003] In view of this, the present invention provides an electronic controller and a control and protection switchgear using the electronic controller, in order to solve the problems that the mainstream CPS control and protection switchgear products on the market are relatively monotonous in function, inflexible, and have a fixed application market, making it difficult to expand outward.

[0004] In a first aspect, this utility model provides an electronic controller, which includes: a main control module, an analog output module, a temperature sampling module, a leakage current sampling module, a three-phase current sampling module, a three-phase voltage sampling module, a display and keyboard module, a leakage current testing module, a custom function input module, and a custom function output module, wherein...

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

[0006] The main control module generates protection control signals based on the signals input from the keyboard, the signals input from the custom function input module, and the collected temperature, leakage current, three-phase current, and three-phase voltage. The protection control signals are then output through the analog output module or the custom function output module to drive the control and protection switching appliances to perform protection actions.

[0007] The electronic controller provided by this utility model integrates multiple functional modules, including an analog output module, a temperature sampling module, a leakage current sampling module, a three-phase current sampling module, a three-phase voltage sampling module, a display and keyboard module, a leakage current testing module, a custom function input module, and a custom function output module. This makes the electronic controller more comprehensive in its protection functions, highly adaptable, and able to meet the diverse needs of users.

[0008] In one optional implementation, 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 optocoupler.

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

[0010] The third end of the first optocoupler is connected to one end of the second resistor, one end of the third resistor, and one end of the second capacitor, respectively; the fourth end of the first optocoupler 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 the DC power supply.

[0012] In one optional implementation, 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 optocoupler, a first diode, and a first relay.

[0013] One end of the fourth resistor is connected to the main control module, and 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 optocoupler is connected to a DC power supply through a fifth resistor, the second end of the second optocoupler is connected to the collector of the first transistor, the third end of the second optocoupler is 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 optocoupler is connected to 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. The switch in the first relay is connected in series in the protection circuit of the controlled equipment.

[0016] In one 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 connected to each phase current, one end of the third capacitor, and one end of the seventh resistor, respectively. The other end of the sixth resistor is connected to the non-inverting input of the first operational amplifier, and the other end of the third capacitor is connected to analog ground.

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

[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 analog ground;

[0020] The non-inverting input of the second operational amplifier is connected to the other end of the ninth resistor, the inverting input of the second operational amplifier is connected to one end of the tenth resistor and one end of the eleventh resistor, and the output of the second operational amplifier is 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 connected to the other end of the seventh resistor and the reference voltage, the other end of the twelfth resistor is connected to one end of the fifth capacitor and the main control module, and the other end of the fifth capacitor is connected to analog ground.

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

[0023] In one optional embodiment, the voltage conversion unit includes: a first voltage transformer, a sixth capacitor, a seventh capacitor, a first Zener diode, and a thirteenth resistor, wherein,

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

[0025] In one optional embodiment, the amplification unit includes: a second Zener diode, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, and a third operational amplifier, wherein,

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

[0027] In one optional implementation, the leakage current 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 current 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 of the fourth operational amplifier is connected to one end of the seventeenth resistor. The inverting input of the fourth operational amplifier is connected to one end of the eighteenth resistor and one end of the nineteenth resistor. The output of the fourth operational amplifier is connected to the other end of the nineteenth resistor and one end of the twentieth resistor. The other end of the seventeenth resistor is 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 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 analog ground.

[0029] The non-inverting input of the fifth operational amplifier is connected to the other end of the second twelfth resistor, the inverting input of the fifth operational amplifier is connected to one end of the second thirteenth resistor and one end of the second fourteenth resistor, the output of the fifth operational amplifier is connected to one end of the second twelfth resistor and the other end of the second fourteenth resistor, the other end of the second thirteenth resistor is connected to analog ground, the other end of the second twelfth resistor is connected to one end of the eleventh capacitor and the main control module, and the other end of the eleventh capacitor is connected to analog ground.

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

[0031] In one optional embodiment, the analog output module includes: a 30th resistor, a 31st resistor, a 32nd resistor, a 33rd resistor, a 2nd transistor, a 3rd transistor, a 3rd optocoupler, a 12th capacitor, a 13th capacitor, a 14th capacitor, and a current conversion chip, wherein...

[0032] The first end of the third optocoupler is connected to the collector of the second transistor, the second end of the third optocoupler is connected to one end of the thirtieth resistor, the third end of the third optocoupler is connected to one end of the thirty-first resistor and one end of the thirty-second resistor, the fourth end of the third optocoupler is connected to one end of the twelfth capacitor and the eighth pin of the current conversion chip, the base of the second transistor is connected to the main control module through the thirty-third resistor, the emitter of the second transistor is connected to the 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 analog ground.

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

[0034] Secondly, this utility model provides a control and protection switchgear using an electronic controller, including the electronic controller described in the first aspect above or any corresponding embodiment thereof.

[0035] This utility model provides a control and protection switchgear using an electronic controller. By adopting the aforementioned electronic controller, multiple functional modules are integrated, including an analog output module, a temperature sampling module, a leakage current sampling module, a three-phase current sampling module, a three-phase voltage sampling module, a display and keyboard module, a leakage current testing module, a custom function input module, and a custom function output module. This makes the protection function of the control and protection switchgear more complete, its adaptability stronger, and can meet the diverse needs of users. Attached Figure Description

[0036] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0037] Figure 1 This is a schematic block diagram of an electronic controller according to an embodiment of the present utility model;

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

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

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

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

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

[0043] Figure 7 This is a circuit diagram of the leakage current testing module according to an embodiment of the present utility model;

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

[0045] Figure 9 This is a circuit diagram of the frequency detection module according to an embodiment of the present utility model;

[0046] Figure 10 This is a circuit diagram of the first communication module according to an embodiment of the present utility model;

[0047] Figure 11 This is a circuit diagram of the first communication module according to an embodiment of the present utility model. Detailed Implementation

[0048] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions 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 embodiments described 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 making creative efforts shall fall within the scope of protection of the present invention.

[0049] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0050] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0051] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0052] This utility model provides an electronic controller for use in controlling and protecting switching electrical appliances. For example... Figure 1 As shown, it includes: a main control module, an analog output module, a temperature sampling module, a leakage current sampling module, a three-phase current sampling module, a three-phase voltage sampling module, a display and keyboard module, a leakage current testing module, a custom function input module, and a custom function output module. The main control module is connected to each of these modules.

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

[0054] The electronic controller provided by this utility model integrates multiple functional modules, including an analog output module, a temperature sampling module, a leakage current sampling module, a three-phase current sampling module, a three-phase voltage sampling module, a display and keyboard module, a leakage current testing module, a custom function input module, and a custom function output module. This makes the electronic controller more comprehensive in its protection functions, highly adaptable, and able to meet the diverse needs of users.

[0055] In one alternative implementation, the custom function input module includes multiple custom function input circuits. For example... 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 optocoupler U5A. One end of the first resistor R16 is connected to the input signal. The other end of the first resistor R16 is connected to one end of the first capacitor C20 and the first end of the first optocoupler U5A. The other end of the first capacitor C20 is connected to the second end of the first optocoupler U5A and then to analog ground. The third end of the first optocoupler U5A is connected to one end of the second resistor R161, one end of the third resistor R162, and one end of the second capacitor C22. The fourth end of the first optocoupler U5A is connected to the other end of the second capacitor C22 and then grounded to 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 acquired by the custom function input circuit can be customized according to user needs. The custom function input circuit filters, smooths, and electrically isolates the acquired signals before inputting them to the main control module. In this embodiment of the invention, the custom function input module includes eight custom function input circuits; this is merely an example and not a limitation.

[0057] In one alternative implementation, the custom function output unit includes multiple custom function output circuits. For example... Figure 3 As shown, each custom function output circuit includes: a fourth resistor R26, a fifth resistor R28, a first transistor Q1, a second optocoupler U20, a first diode D4, and a first relay KA3. One end of the fourth resistor R26 is connected to the main control module, and the other end is connected to the base of the first transistor Q1, with the emitter of Q1 grounded. The first end of the second optocoupler U20 is connected to a 3.3V DC power supply via the fifth resistor R28. The second end of the second optocoupler U20 is connected to the collector of the first transistor Q1. The third end of the second optocoupler U20 is connected to one end of the coil in the first relay KA3 and the anode of the first diode D4, respectively. The fourth end of the second optocoupler U20 is connected to analog ground. The other end of the coil in the first relay KA3 is connected to a 24V DC power supply and the cathode of the first diode D4, respectively. The switch in the first relay KA3 is connected in series in the protection circuit of the controlled device. In particular, the switch in the first relay KA3 is connected in series in the protection circuit of the controlled equipment 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 switching operation based on this signal, thereby controlling the protection circuit of the controlled equipment. In this embodiment of the invention, the custom function output module includes four custom function output circuits; this is merely an example and not a limitation.

[0059] In one 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. Each phase current sampling circuit is identical, as described below. Figure 4 The following explanation uses the C-phase current sampling circuit as an example. 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] In this configuration, one end of the sixth resistor R63 is connected to the current in each phase, 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 non-inverting input of the first operational amplifier U23A, and the other end of the third capacitor C21 is connected to analog ground. The inverting input of the first operational amplifier U23A is connected to its output, one end of the eighth resistor R64, and one end of the ninth resistor R70. The other end of the eighth resistor R64 is 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 analog ground. The non-inverting input of the second operational amplifier U23B is connected to the other end of the ninth resistor R70. The inverting input of the second operational amplifier U23B is connected to one end of the tenth resistor R180 and one end of the eleventh resistor R181. The output of the second operational amplifier U23B is 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. The other end of the twelfth resistor R74 is connected to one end of the fifth capacitor C27 and the main control module. The other end of the fifth capacitor C27 is connected to analog ground.

[0061] Specifically, the A-phase current sampling circuit uses two operational amplifiers. The A-phase current, after processing by the first-stage operational amplifier, sends a high-level current signal IAO0 to the main control module; the A-phase current, after processing by both the first and second-stage operational amplifiers, sends a low-level current signal IAO to the main control module. The B-phase current sampling circuit also uses two operational amplifiers. The B-phase current, after processing by the first-stage operational amplifier, sends a high-level current signal IBO0 to the main control module; the B-phase current, after processing by both the first and second-stage operational amplifiers, sends a low-level current signal IBO to the main control module. The C-phase current sampling circuit also uses two operational amplifiers. The C-phase current, after processing by the first operational amplifier U23A, sends a high-level current signal ICO0 to the main control module; the C-phase current, after processing by both the first operational amplifier U23A and the second operational amplifier U23B, sends a low-level current signal ICO to the main control module. Additionally, the IE signal branch is used to detect whether there is a ground fault in the three-phase current. When the IE signal is 0, there is no ground fault.

[0062] In one 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 terminal of the voltage conversion unit is connected to the three-phase voltage, the second terminal of the voltage conversion unit is connected to the first terminal of the amplification unit, and the second terminal of the amplification unit is connected to the main control module.

[0063] Specifically, the conversion and amplification units in each line voltage sampling circuit are the same, as shown below. Figure 5 The AB line voltage conversion unit and AB line voltage amplification unit in the AB line voltage sampling circuit shown are used as examples for illustration. 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 Zener diode VD1, and a thirteenth resistor R212. The first terminal of the first voltage transformer U30 is connected to one end of the sixth capacitor C45 and the A-phase voltage. The second terminal of the first voltage transformer U30 is connected to the other end of the sixth capacitor C45 and the B-phase voltage. The third terminal of the first voltage transformer U30 is connected to the AB line voltage amplification unit and one end of the thirteenth resistor R212. The fourth terminal of the first voltage transformer U30 is connected to the cathode of the first Zener diode VD1, the other end of the thirteenth resistor R212, one end of the seventh capacitor C48, and the reference voltage REF_1.6V. The anode of the first Zener diode VD1 and the other end of the seventh capacitor C48 are both connected to analog ground.

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

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

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

[0067] In this configuration, the non-inverting input of the fourth operational amplifier U26A is connected to one end of the seventeenth resistor R2, the inverting input of the fourth operational amplifier U26A is connected to one end of the eighteenth resistor R3 and one end of the nineteenth resistor R4, the output of the fourth operational amplifier U26A is 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 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 connected to one end of the tenth capacitor C3 and the main control module, and 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 analog ground. The non-inverting input of the fifth operational amplifier U26B is connected to the other end of the twenty-second resistor R6. The inverting input of the fifth operational amplifier U26B is connected to one end of the twenty-third resistor R7 and one end of the twenty-fourth resistor R8, respectively. The output of the fifth operational amplifier U26B is connected to one end of the twenty-fifth resistor R9 and the other end of the twenty-fourth resistor R8, respectively. The other end of the twenty-third resistor R7 is connected to analog ground. The other end of the twenty-fifth resistor R9 is connected to one end of the eleventh capacitor C5 and the main control module, respectively. The other end of the eleventh capacitor C5 is connected to analog ground.

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

[0069] In one alternative implementation, such as Figure 7 As shown, the leakage current test module includes: resistor R11 (26th), resistor R12 (27th), resistor R10 (28th), resistor R13 (29th), capacitor C7 (22nd), capacitor C6 (13th), and operational amplifier U26C (6th). The non-inverting input of operational amplifier U26C is connected to one end of resistor R11, one end of resistor R12, and one end of capacitor C7. The inverting input of operational amplifier U26C is connected to its output and one end of resistor R13. The other end of resistor R13 is connected to the main control module. The other end of resistor R11 is connected to one end of resistor R10 and one end of capacitor C6. One end of resistor R10 is connected to the main control module. The other ends of capacitor C6, resistor R11, and capacitor C7 are connected to analog ground.

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

[0071] In one alternative implementation, such as Figure 8 As shown, the analog output module includes: 30th resistor R18, 31st resistor R19, 32nd resistor R20, 33rd resistor R17, 2nd transistor Q3, 3rd transistor Q4, 3rd optocoupler U40, 12th capacitor C10, 13th capacitor C11, 14th capacitor C12 and current conversion chip U2.

[0072] Specifically, the first end of the third optocoupler U40 is connected to the collector of the second transistor Q3; the second end of the third optocoupler U40 is connected to one end of the thirtieth resistor R18; the third end of the third optocoupler U40 is 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 optocoupler U40 is 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 to GND; and the other ends of the thirty-first resistor R19 and the twelfth capacitor C10 are connected to analog ground. The second pin of the current conversion chip U2 is 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 analog ground. The fourth pin of the current conversion chip U2 serves as the analog output terminal. 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 connected to the collector of the third transistor Q4 and the 24V DC power supply. The other ends of the thirteenth capacitor C11 and the fourteenth capacitor C12 are both connected to analog ground.

[0073] Specifically, the digital signal output by the main control module undergoes digital-to-analog conversion, electrical isolation, filtering, and smoothing in the analog output module before being converted into a 4-20mA analog signal for output.

[0074] In one alternative implementation, the electronic controller further includes a frequency detection module. For example... Figure 9As shown, the frequency detection module includes resistors R30 (34th), R31 (35th), R32 (36th), R33 (37th), R34 (38th), and operational amplifier U51A (7th). The non-inverting input of operational amplifier U51A is connected to one end of resistor R33 (37th) and one end of resistor R32 (36th). The inverting input of operational amplifier U51A is connected to one end of resistor R34 (38th). The output of operational amplifier U51A is connected to one end of resistor R31 (35th). The other end of resistor R33 is connected to... Figure 5 Ua1 is connected in the middle, and the other end of the thirty-eighth resistor 34 is connected to... Figure 5 The reference voltage REF_1.6V is connected, and 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 one optional implementation, the electronic controller further includes: a first communication module and a second communication module. For example... Figure 10As shown, the first communication module includes: a first communication chip U1, a 39th resistor R21, a 40th resistor R22, a 41st resistor R23, a 42nd resistor R24, a 43rd resistor R25, a 15th capacitor C15, a 16th capacitor C16, a first common-mode inductor T1, a first TVS diode D1, a second TVS diode D2, and a third TVS diode D3. The VDD1 pin of the first communication chip U1 is connected to a 3.3V power supply, one end of the 39th resistor R21, and one end of the 15th capacitor C15. The other end of the 39th resistor R21 is connected to the PV pin of the first communication chip U1, and the other end of the 15th capacitor C15 is grounded. The VDD2 pin of the first communication chip U1 is connected to a 5V power supply and one end of the 16th capacitor C16, and the other end of the 16th capacitor C16 is grounded. The GND1 and GND2 pins 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 via a 485 bus. The RE and DE pins of the first communication chip U1 are connected to the RE / DE1 pins of the main control module via a 485 bus. The TXD pin of the first communication chip U1 is connected to the TX1 pin of the main control module via a 485 bus. The A pin of the first communication chip U1 is connected to one end of the 41st resistor R23, one end of the 43rd resistor R25, and the fourth end of the first common-mode inductor T1. The other end of the 41st resistor R23 is connected to a 5V power supply. The B pin of the first communication chip U1 is 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. The other end of the 40th resistor R22 is grounded. The first end of the first common-mode inductor T1 is connected to one end of the first TVS diode D1, one end of the second TVS diode D2, and the B pin of the peer device. The other end of the first TVS diode D1 is grounded. The second end of the first common-mode inductor T1 is connected to one end of the third TVS transistor D3, the other end of the second TVS transistor D2, and pin A of the opposite device, respectively. The other end of the third TVS transistor D3 is grounded.

[0076] like Figure 11As shown, the second communication module includes: a second communication chip IC1, a forty-fourth resistor R236, a forty-fifth resistor R237, a forty-sixth resistor R238, a forty-seventh resistor R239, a seventeenth capacitor C120, a fourth TVS diode D21, and a first common-mode inductor T4. The RO pin of the second communication chip IC1 is connected to the RX2 pin of the main control module via a 485 bus, and the other end of the forty-fourth resistor R233 is connected to a 3.3V power supply. The RE and DE pins of the second communication chip IC1, which are active low, are connected to the RE / DE2 pins of the main control module via a 485 bus. The DI pin of the second communication chip IC1 is connected to the TX2 pin of the main control module via a 485 bus. The VCC pin of the second communication chip IC1 is connected to one end of the seventeenth capacitor C120 and the 3.3V power supply, while the other end of the seventeenth capacitor C120 is grounded. In the second communication chip IC1, the low-level active DO / RI is connected to the first terminal of the first common-mode inductor T4, one terminal of the forty-sixth resistor R238, and the second terminal of the fourth TVS diode D21 via the forty-fourth resistor R236. The high-level active DO / RI in the second communication chip IC1 is connected to the second terminal of the first common-mode inductor T4, one terminal of the forty-seventh resistor R239, and the first terminal of the fourth TVS diode D21 via the forty-fifth resistor R237. The third terminal of the fourth TVS diode D21 is grounded. The third terminal of the first common-mode inductor T4 is connected to the other terminal of the forty-sixth resistor R238 and the B2 pin of the opposite device. The fourth terminal of the first common-mode inductor T4 is connected to the other terminal of the forty-seventh resistor R239 and the A2 pin of the opposite device. This utility model provides a control and protection switching device using an electronic controller, including the electronic controller described above.

[0077] Specifically, this utility model provides a control and protection switchgear using an electronic controller. By employing this electronic controller, multiple functional modules are integrated, including an analog output module, a temperature sampling module, a leakage current sampling module, a three-phase current sampling module, a three-phase voltage sampling module, a display and keyboard module, a leakage current testing module, a custom function input module, and a custom function output module. This makes the protection functions of the control and protection switchgear more comprehensive, its adaptability stronger, and it can meet diverse user needs. Furthermore, the above-mentioned electronic controller can also be applied to other switchgear.

[0078] Although the embodiments of the present invention have been described with reference to 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 shall fall 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 current sampling module, a three-phase current sampling module, a three-phase voltage sampling module, a display and keyboard module, a leakage current testing module, a custom function input module, and a custom function output module. The main control module is connected to the temperature sampling module, the leakage current sampling module, the three-phase current sampling module, the three-phase voltage sampling module, the display and keyboard module, the leakage current testing module, the custom function input module, the analog output module, and the custom function output module, respectively. The main control module generates protection control signals based on the signals input from the keyboard, the signals input from the custom function input module, and the collected temperature, leakage current, three-phase current, and three-phase voltage. The protection control signals are then output through the analog output module or the custom function output module to drive the control and protection switching appliances to perform protection actions.

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 optocoupler. One end of the first resistor is connected to the input signal, and the other end of the first resistor is connected to one end of the first capacitor and the first end of the first optocoupler, respectively. The other end of the first capacitor is connected to the second end of the first optocoupler and connected to analog ground. The third end of the first optocoupler is connected to one end of the second resistor, one end of the third resistor, and one end of the second capacitor, respectively; the fourth end of the first optocoupler 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 the 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 custom function output circuit includes: a fourth resistor, a fifth resistor, a first transistor, a second optocoupler, a first diode, and a first relay. One end of the fourth resistor is connected to the main control module, and 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 optocoupler is connected to a DC power supply through a fifth resistor, the second end of the second optocoupler is connected to the collector of the first transistor, the third end of the second optocoupler is 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 optocoupler is connected to 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. The switch in the first relay is connected in series in the protection circuit of the controlled equipment.

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. 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. One end of the sixth resistor is connected to each phase current, one end of the third capacitor, and one end of the seventh resistor, respectively. The other end of the sixth resistor is connected to the non-inverting input of the first operational amplifier, and the other end of the third capacitor is connected to analog ground. The inverting input terminal of the first operational amplifier is connected to the output terminal of the first operational amplifier, one end of the eighth resistor, and one end of the ninth resistor, respectively. 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 analog ground; The non-inverting input of the second operational amplifier is connected to the other end of the ninth resistor, the inverting input of the second operational amplifier is connected to one end of the tenth resistor and one end of the eleventh resistor, and the output of the second operational amplifier is connected to the other end of the eleventh resistor and one end of the twelfth resistor. The other end of the tenth resistor is connected to the other end of the seventh resistor and the reference voltage, the other end of the twelfth resistor is connected to one end of the fifth capacitor and the main control module, and the other end of the fifth capacitor is connected to analog ground.

5. The electronic controller according to claim 1, characterized in that, The three-phase voltage sampling module includes: AB line voltage sampling circuit, BC line voltage sampling circuit and CA line voltage sampling circuit. Each line voltage sampling circuit includes: voltage conversion unit and amplification unit. The first terminal of the voltage conversion unit is connected to the three-phase voltage, the second terminal of the voltage conversion unit is connected to the first terminal of the amplification unit, and the second terminal 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 Zener diode, and a thirteenth resistor, wherein... The first terminal of the first voltage transformer is connected to one terminal of the sixth capacitor and any one phase voltage, the second terminal of the first voltage transformer is connected to the other terminal of the sixth capacitor and any one of the remaining two phase voltages, the third terminal of the first voltage transformer is connected to the amplification unit and one terminal of the thirteenth resistor, the fourth terminal of the first voltage transformer is connected to the cathode of the first Zener diode, the other terminal of the thirteenth resistor, one terminal of the seventh capacitor and the reference voltage, and the anode of the first Zener diode and the other terminal 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 Zener diode, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, and a third operational amplifier, wherein... The non-inverting input of the third operational amplifier is connected to the reference voltage. The inverting input of the third operational amplifier is connected to one end of the fourteenth resistor and one end of the fifteenth resistor, respectively. The output of the third operational amplifier is connected to the other end of the fifteenth resistor and one end of the sixteenth resistor, respectively. The other end of the sixteenth resistor is connected to the main control module. The other end of the fourteenth resistor is connected to the cathode of the second Zener diode and the conversion unit, respectively. The anode of the second Zener diode is connected to analog ground.

8. The electronic controller according to claim 1, characterized in that, The leakage current 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 current 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. The non-inverting input of the fourth operational amplifier is connected to one end of the seventeenth resistor. The inverting input of the fourth operational amplifier is connected to one end of the eighteenth resistor and one end of the nineteenth resistor. The output of the fourth operational amplifier is connected to the other end of the nineteenth resistor and one end of the twentieth resistor. The other end of the seventeenth resistor is 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 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 analog ground. The non-inverting input of the fifth operational amplifier is connected to the other end of the second twelfth resistor, the inverting input of the fifth operational amplifier is connected to one end of the second thirteenth resistor and one end of the second fourteenth resistor, the output of the fifth operational amplifier is connected to one end of the second twelfth resistor and the other end of the second fourteenth resistor, the other end of the second thirteenth resistor is connected to analog ground, the other end of the second twelfth resistor is connected to one end of the eleventh capacitor and the main control module, and the other end of the eleventh capacitor is connected to analog ground. The non-inverting input of the sixth operational amplifier is connected to one end of the twenty-sixth resistor, one end of the twenty-seventh resistor, and one end of the twelfth capacitor, respectively. The inverting input of the sixth operational amplifier is connected to the output of the sixth operational amplifier and one end of the twenty-ninth resistor, respectively. The other end of the twenty-ninth resistor is connected to the main control module. The other end of the twenty-sixth resistor is connected to one end of the twenty-eighth resistor and one end of the thirteenth capacitor, respectively. One end of the twenty-eighth resistor is connected to the main control module. The other ends of the thirteenth capacitor, the twenty-sixth resistor, and the twelfth capacitor are connected to 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 2nd transistor, a 3rd transistor, a 3rd optocoupler, a 12th capacitor, a 13th capacitor, a 14th capacitor, and a current conversion chip. The first end of the third optocoupler is connected to the collector of the second transistor, the second end of the third optocoupler is connected to one end of the thirtieth resistor, the third end of the third optocoupler is connected to one end of the thirty-first resistor and one end of the thirty-second resistor, the fourth end of the third optocoupler is connected to one end of the twelfth capacitor and the eighth pin of the current conversion chip, the base of the second transistor is connected to the main control module through the thirty-third resistor, the emitter of the second transistor is connected to the 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 analog ground. The second pin of the current conversion chip is connected to one end of the thirteenth capacitor, one end of the fourteenth capacitor, and the other end of the thirty-second resistor, respectively. The third pin of the current conversion chip is connected to analog ground. The fourth pin of the current conversion chip serves as an 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 connected to the collector of the third transistor and the DC power supply, respectively. The other ends of the thirteenth capacitor and the fourteenth capacitor are both connected to analog ground.

10. A control and protection switching device using an electronic controller, characterized in that, Includes the electronic controller as described in any one of claims 1-9.

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