Display circuit for controlling and protecting switching device

Abstract

The utility model relates to the technical field of displays, and discloses a display circuit for controlling and protecting a switching device. According to the display circuit, a signal interface unit is connected with a communication unit and is used for establishing information interaction between a CPS controller and the communication unit; the communication unit is connected with the control unit and is used for acquiring a to-be-displayed signal of the CPS controller through the signal interface unit, performing isolation conversion on the to-be-displayed signal and outputting the to-be-displayed signal to the control unit; the control unit is used for analyzing and processing the isolated and converted signal to be displayed and then generating a corresponding display driving signal; and the display and driving unit is connected with the control unit and is used for displaying corresponding information according to the display driving signal. According to the utility model, real-time display of related data of the CPS can be realized, so that a worker can remotely monitor and debug the state of the CPS in real time conveniently, or when the CPS breaks down, a fault point can be remotely and rapidly positioned.

Description

TECHNICAL FIELD

[0001] The utility model relates to display technology field, concretely relates to a display circuit of control and protective switching device. BACKGROUND

[0002] In the related art, control and protective switching device (CPS) is widely used in industrial production and power transmission, and generally adopts integrated structure design to integrate data display, parameter setting and other function modules on the CPS controller. However, for the application in power distribution cabinet body or drawer, even some high requirement use environment requiring closed space, the integrated structure of CPS is not conducive to the debugging and maintenance of the staff. SUMMARY

[0003] Therefore, the utility model embodiment provides a display circuit of control and protective switching device to solve the technical problem that the integrated structure of CPS is not conducive to the debugging and maintenance of the staff in the related art for the application in power distribution cabinet body or drawer, even some high requirement use environment requiring closed space.

[0004] The utility model provides a display circuit of control and protective switching device, include: signal interface unit, communication unit, display and drive unit and control unit,

[0005] Signal interface unit is connected with communication unit, and is used for establishing the information interaction between CPS controller and communication unit,

[0006] Communication unit is connected with control unit, and is used for obtaining the to-be-displayed signal of CPS controller through signal interface unit, and the to-be-displayed signal is isolated and converted and then output to control unit,

[0007] Control unit is used for generating corresponding display drive signal after analyzing and processing the to-be-displayed signal after isolation and conversion,

[0008] Display and drive unit are connected with control unit, and are used for displaying corresponding information according to display drive signal.

[0009] In an optional embodiment, it further includes a key unit,

[0010] Key unit is connected with control unit, and is used for sending corresponding operation signal to control unit according to triggered key operation,

[0011] Control unit is further used for encoding operation signal and sending to communication unit,

[0012] The communication unit is also used to convert the operation signal into a format conforming to a communication protocol and then send it to the CPS controller through the signal interface unit.

[0013] In an alternative embodiment, it further comprises a power buffer unit.

[0014] The power buffer unit is connected with the signal interface unit, the communication unit, the control unit, the display and driving unit and the key unit respectively, and is used to obtain the power signal of the CPS controller through the signal interface unit, and then transform and process the power signal and output it to the signal interface unit, the communication unit, the control unit, the display and driving unit and the key unit respectively.

[0015] In an alternative embodiment, the signal interface unit comprises a network port, a first magnetic bead, a second magnetic bead, a third magnetic bead, a fourth magnetic bead, a fifth magnetic bead, a sixth magnetic bead, a seventh magnetic bead and an eighth magnetic bead.

[0016] One end of the fourth magnetic bead and the fifth magnetic bead is connected with the first pin of the network port respectively; one end of the third magnetic bead and the sixth magnetic bead is connected with the second pin of the network port respectively; one end of the second magnetic bead and the seventh magnetic bead is connected with the seventh pin of the network port respectively; one end of the first magnetic bead and the eighth magnetic bead is connected with the eighth pin of the network port respectively; the other end of the fifth magnetic bead is connected with the other end of the sixth magnetic bead, the other end of the seventh magnetic bead and the other end of the eighth magnetic bead and directly grounded; the other end of the third magnetic bead and the other end of the fourth magnetic bead are connected with the communication unit; the other end of the first magnetic bead is connected with the power buffer unit; the other end of the second magnetic bead is directly grounded.

[0017] In an alternative embodiment, the power buffer unit comprises a fuse, a first MOS tube, a diode, a first resistor, a second resistor, an inductor, a first capacitor, a second capacitor and a third capacitor.

[0018] One end of the fuse is connected with the other end of the first magnetic bead; the other end of the fuse is connected with one end of the diode, one end of the first capacitor and one end of the inductor respectively; the other end of the first capacitor is connected with one end of the first resistor; the other end of the first resistor is connected with the other end of the diode, one end of the second resistor and the G end of the first MOS tube respectively; the other end of the inductor is connected with the S end of the first MOS tube; the other end of the second resistor is grounded; the D end of the first MOS tube is connected with one end of the second capacitor and one end of the third capacitor respectively; the other end of the second capacitor and the other end of the third capacitor are grounded.

[0019] In an alternative embodiment, the control unit comprises a main chip, a fourth capacitor, a fifth capacitor, a sixth capacitor and a third resistor.

[0020] The reset pin of the main chip is connected with one end of the third resistor and one end of the fourth capacitor; the other end of the third resistor is connected with the working power supply; the other end of the fourth capacitor is grounded; one end of the fifth capacitor and one end of the sixth capacitor are connected with the working power supply pin of the main chip, and the other end of the fifth capacitor and the other end of the sixth capacitor are connected with the ground pin of the main chip.

[0021] In an alternative embodiment, the communication unit comprises a communication chip, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a TVS tube, a common mode inductor, and a seventh capacitor.

[0022] One end of the fifth resistor is connected with the second pin and the third pin of the communication chip and the RST pin of the main chip respectively, one end of the eighth resistor is connected with the first pin of the communication chip and the RXD2 pin of the main chip respectively, the fourth pin of the communication chip U3 is connected with the TXD2 pin of the main chip, the sixth pin of the communication chip is connected with one end of the fourth resistor and one end of the sixth resistor respectively, the seventh pin of the communication chip is connected with one end of the ninth resistor and one end of the eleventh resistor respectively, the other end of the sixth resistor is connected with one end of the seventh resistor and the third pin of the common mode inductor respectively, the other end of the eleventh resistor is connected with one end of the tenth resistor and the fourth pin of the common mode inductor respectively, the other end of the seventh resistor is connected with the first pin of the common mode inductor, the first pin of the TVS tube, and the other end of the fourth magnetic bead respectively, the other end of the tenth resistor is connected with the second pin of the common mode inductor, the second pin of the TVS tube, and the other end of the third magnetic bead respectively, the other end of the fourth resistor, the other end of the eighth resistor, and one end of the seventh capacitor are connected with the working power supply, the other end of the ninth resistor, the other end of the seventh capacitor, the other end of the resistor, and the third pin of the TVS tube are grounded.

[0023] In an alternative embodiment, the key unit comprises eight resistors and eight keys.

[0024] One end of each key is grounded, the other end of each key is connected with the main chip and a resistor respectively, and the other end of the resistor is connected with the working power supply.

[0025] As can be seen from the above technical solutions, the utility model has the following advantages:

[0026] The utility model embodiment sets up signal interface unit, can realize signal transmission between CPS controller and communication unit, the signal to be displayed that CPS controller transmission first carries out isolation conversion through communication unit, to eliminate signal interference, improve communication quality and stability, then again through control unit analysis processing, the original signal to be displayed that receives carries out analysis decoding, converts useful information, and according to these useful information produces corresponding display drive signal, to drive display and drive unit to display corresponding information, realizes the real -time display of CPS relevant data, and then the state of remote monitoring CPS of staff is convenient, and carries out necessary debugging, or when CPS breaks down, can remote rapid positioning fault point, and then improve the maintenance efficiency and cost of staff. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the specific embodiment of the utility model or the technical scheme in prior art, the following will briefly introduce the drawing needed to be used in the specific embodiment or prior art description, obviously, the drawing in the following description is some embodiments of the utility model, for ordinary skilled person in the art, under the premise of not paying creative labor, still can obtain other drawings according to these drawings.

[0028] Figure 1 It is the structural diagram of display circuit of control and protection switch appliance provided by the utility model embodiment;

[0029] Figure 2 It is the circuit principle drawing of signal interface unit provided by the utility model embodiment;

[0030] Figure 3 It is the circuit principle drawing of power buffer unit provided by the utility model embodiment;

[0031] Figure 4 It is the circuit principle drawing of control unit provided by the utility model embodiment;

[0032] Figure 5 It is the circuit principle drawing of communication unit provided by the utility model embodiment;

[0033] Figure 6 It is the partial circuit principle drawing of display and drive unit provided by the utility model embodiment;

[0034] Figure 7 It is another partial circuit principle drawing of display and drive unit provided by the utility model embodiment;

[0035] Figure 8 It is the circuit principle drawing of key unit provided by the utility model embodiment. BRIEF DESCRIPTION OF DRAWINGS:

[0037] 1, signal interface unit; 2, communication unit; 3, control unit; 4, display and drive unit; 5, key unit; 6, power buffer unit; RJ1, network port, L1, first magnetic bead; L2, second magnetic bead; L3, third magnetic bead; L4, fourth magnetic bead; L5, fifth magnetic bead; L6, sixth magnetic bead; L7, seventh magnetic bead; L8, eighth magnetic bead; F1, fuse; U2, first MOS tube; Q6, second MOS tube; D1, diode; R2, first resistor; R3, second resistor; R1, third resistor; R12, fourth resistor; R13, fifth resistor; R14, sixth resistor; R15, seventh resistor; R17, eighth resistor; R18, ninth resistor; R19, tenth resistor; R20, eleventh resistor; R31, twelfth resistor; R32, thirteenth resistor; R7, fourteenth resistor; R8, fifteenth resistor; R9, sixteenth resistor; R10, seventeenth resistor; R11, eighteenth resistor; R5, nineteenth resistor; R4, twentieth resistor; R6, twenty-first resistor; L9, inductor; C2, first capacitor; C3, second capacitor; C4, third capacitor; C1, fourth capacitor; C5, fifth capacitor; C6, sixth capacitor; C7, seventh capacitor; C8, eighth capacitor; C9, ninth capacitor; U1, main chip; D2, TVS tube; U3, communication chip; L10, common mode inductor; JP2, liquid crystal screen interface; JP3, liquid crystal screen backlight interface; Q1, first triode; Q2, second triode; Q3, third triode; Q4, fourth triode; Q5, fifth triode; LED1, first light emitting diode; LED2, second light emitting diode; LED3, third light emitting diode; LED4, fourth light emitting diode; LED5, fifth light emitting diode; S1, first key; S2, second key; S3, third key; S4, fourth key; S5, fifth key; S6, sixth key; S7, seventh key; S8, eighth key. DETAILED DESCRIPTION

[0038] The technical solutions of the present application will be described clearly and completely in combination with the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0039] In the description of the utility model, it needs to explain, the term "upper", "lower", "left", "right" "internal", "external" and so on indicate the orientation or position relation is based on the orientation or position relation shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and is not indicate or imply that the device or element must have a particular orientation, with a particular orientation structure and operation, therefore cannot be understood as the limitation of the utility model. In addition, the term "first", "second" and so on are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0040] In the description of the utility model, it needs to explain, unless another explicit provision and limitation, the term "installation", "connection", "connect" should be broad sense, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, also can be the communication inside two elements, can be wireless connection, also can be wired connection. For ordinary skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0041] In addition, the technical features involved in the different embodiments of the utility model described below can be combined with each other as long as there is no conflict.

[0042] The utility model embodiment provides a kind of display circuit of control and protective switching device, is set independently from control and protective switching device (Control and Protective Switching Device, is called CPS for short), and information interaction is carried out with CPS by wired or wireless mode.

[0043] Figure 1 It is a kind of control and protective switching device structural schematic diagram according to the utility model embodiment, as Figure 1 The utility model embodiment provides a kind of display circuit of control and protective switching device, including: signal interface unit 1, communication unit 2, display and driving unit 4 and control unit 3.

[0044] Specifically, signal interface unit 1 is connected with communication unit 2, signal interface unit 1 is used to establish the information interaction between CPS controller and communication unit 2;Communication unit 2 is connected with control unit 3, and communication unit 2 is used to obtain the display signal of CPS controller through signal interface unit 1, and the display signal is isolated and converted and then output to control unit 3;Control unit 3 is used to analyze and process the display signal after isolation and conversion and generate corresponding display driving signal;Display and driving unit 4 is connected with control unit 3, and display and driving unit 4 is used to display corresponding information according to display driving signal.

[0045] The utility model embodiment sets up signal interface unit, can realize signal transmission between CPS controller and communication unit, the signal that CPS controller transmission first passes through communication unit and carries out isolation conversion to eliminate signal interference, improves communication quality and stability, then passes through control unit and carries out analysis processing again, the original signal that receives and displays carries out analysis decoding, converts into useful information, and according to these useful information produces corresponding display drive signal to drive display and drive unit to display corresponding information, realizes the real -time display of CPS relevant data, and then the state of CPS is conveniently monitored in real time by staff, and carries out necessary debugging, or when CPS breaks down, can remote rapid positioning fault point, and then improve the maintenance efficiency and cost of staff.

[0046] In an alternative embodiment, the display circuit for controlling and protecting the switchgear further comprises a key unit 5.

[0047] Specifically, the key unit 5 is connected to the control unit 3 and configured to send corresponding operation signals to the control unit 3 according to triggered key operations; the control unit 3 is further configured to send the operation signals to the communication unit 2 after encoding processing; and the communication unit 2 is further configured to convert the operation signals into a format conforming to a communication protocol and then send the operation signals to the CPS controller through the signal interface unit 1.

[0048] When the staff needs to query or modify the relevant information of the CPS, the corresponding key operation is triggered, at which time the key unit 5 can send corresponding operation signals to the control unit 3 according to the triggered key operation, and then the control unit 3 encodes the operation signals, the communication unit 2 converts the operation signals into a protocol format, and the operation signals are output to the CPS controller. The operation signals after encoding and protocol format conversion can be used as a request for data query, modification, and other related operations of the CPS controller to realize remote debugging.

[0049] In an alternative embodiment, the display circuit for controlling and protecting the switchgear further comprises a power buffer unit 6.

[0050] Specifically, the power buffer unit 6 is connected to the signal interface unit 1, the communication unit 2, the control unit 3, the display and drive unit 4, and the key unit 5, respectively. The power buffer unit 6 is configured to acquire power signals of the CPS controller through the signal interface unit 1 and output the power signals to the signal interface unit, the communication unit, the control unit, the display and drive unit, and the key unit after conversion processing.

[0051] The power supply signal transmitted by the CPS controller through the signal interface unit is input to the power buffer unit 6, and then the power buffer unit 6 transforms and processes the power supply signal to obtain a power supply suitable for the signal interface unit, the communication unit, the control unit, the display and driving unit and the key unit to work, so as to supply power to the foregoing units.

[0052] In addition, the power buffer unit 6 can realize hot plug operation, facilitate installation and debugging, and can also absorb excessive impact current caused by hot plug operation.

[0053] In an optional embodiment, as shown in the figure, Figure 2 The signal interface unit 1 comprises a network port RJ1, a first magnetic bead L1, a second magnetic bead L2, a third magnetic bead L3, a fourth magnetic bead L4, a fifth magnetic bead L5, a sixth magnetic bead L6, a seventh magnetic bead L7 and an eighth magnetic bead L8.

[0054] Specifically, one end of the fourth magnetic bead L4 and one end of the fifth magnetic bead L5 are connected to the first pin of the network port RJ1; one end of the third magnetic bead L3 and one end of the sixth magnetic bead L6 are connected to the second pin of the network port RJ1; one end of the second magnetic bead L2 and one end of the seventh magnetic bead L7 are connected to the seventh pin of the network port RJ1; one end of the first magnetic bead L1 and one end of the eighth magnetic bead L8 are connected to the eighth pin of the network port RJ1; the other end of the fifth magnetic bead L5 is connected to the other end of the sixth magnetic bead L6, the other end of the seventh magnetic bead L7 and the other end of the eighth magnetic bead L8 and is directly grounded, the other end of the third magnetic bead L3 and the other end of the fourth magnetic bead L4 are connected to the communication unit 2, the other end of the first magnetic bead L1 is connected to the power buffer unit 6, and the other end of the second magnetic bead L2 is directly grounded.

[0055] Preferably, the network port is an RJ45 port.

[0056] In an optional embodiment, the other end of the third magnetic bead L3 is connected to the second pin (DE end) of the TVS tube D2 of the communication unit 2, and the other end of the fourth magnetic bead L4 is connected to the first pin (DA end) of the TVS tube D2 of the communication unit 2.

[0057] In an optional embodiment, the other end of the first magnetic bead L1 is a display working power input power, that is, a power supply signal transmitted by the CPS controller through the signal interface unit 1.

[0058] In an optional embodiment, the other end of the first magnetic bead L1 is connected to one end of the fuse F1 of the power buffer circuit.

[0059] In an optional embodiment, as shown in the figure, Figure 3As shown, the power buffer unit 6 comprises: a fuse F1, a first MOS tube U2, a diode D1, a first resistor R2, a second resistor R3, an inductor L9, a first capacitor C2, a second capacitor C3 and a third capacitor C4.

[0060] Specifically, one end of the fuse F1 is connected with the other end of the first magnetic bead L1, the other end of the fuse F1 is connected with one end of the diode D1, one end of the first capacitor C2 and one end of the inductor L9 respectively, the other end of the first capacitor C2 is connected with one end of the first resistor R2, the other end of the first resistor R2 is connected with the other end of the diode D1, one end of the second resistor R3 and the G terminal of the first MOS tube U2 respectively; the other end of the inductor L9 is connected with the S terminal of the first MOS tube U2, the other end of the second resistor R3 is grounded, the D terminal of the first MOS tube U2 is connected with one end of the second capacitor C3 and one end of the third capacitor C4 respectively, and serves as the working power supply output of each unit in the display; the other end of the second capacitor C3 and the other end of the third capacitor C4 are both grounded.

[0061] Preferably, the fuse F1 is a self-recovery fuse.

[0062] In an alternative embodiment, the other end of the fuse F1 is connected with the cathode of the diode D1 respectively, and the other end of the first resistor R2 is connected with the anode of the diode D1 and one end of the second resistor R3 respectively.

[0063] Preferably, the G terminal of the first MOS tube U2 is a gate, the S terminal is a source, and the D terminal is a drain.

[0064] In an alternative embodiment, the G terminal of the first MOS tube U2 is 1, the S terminal is 3, and the D terminal is 4. The other end of the inductor L9 is connected with the three S terminals of the first MOS tube U2, and the four D terminals of the first MOS tube U2 are connected with one end of the second capacitor C3 and one end of the third capacitor C4, which can serve as the working power supply output of each unit in the display.

[0065] In an alternative embodiment, as shown, Figure 4 the control unit 3 comprises: a main chip U1, a fourth capacitor C1, a fifth capacitor C5, a sixth capacitor C6 and a third resistor R1.

[0066] The reset pin (RST pin) of the main chip U1 is connected with one end of the third resistor R1 and one end of the fourth capacitor C1; the other end of the third resistor R1 is connected with the working power supply (the working power supply output by the power buffer unit 6); the other end of the fourth capacitor C1 is grounded; one end of the fifth capacitor C5 and one end of the sixth capacitor C6 are both connected with the working power supply pin of the main chip U1, and the other end of the fifth capacitor C5 and the other end of the sixth capacitor C6 are both connected with the ground pin of the main chip U1.

[0067] In one alternative implementation, such as Figure 5 As shown, the communication unit 2 includes: a communication chip U3, a fourth resistor R12, a fifth resistor R13, a sixth resistor R14, a seventh resistor R15, an eighth resistor R17, a ninth resistor R18, a tenth resistor R19, an eleventh resistor R20, a TVS diode D2, a common-mode inductor L10, and a seventh capacitor C7.

[0068] Specifically, one end of the fifth resistor R13 is connected to the second pin (RE pin) and the third pin (DE pin) of the communication chip U3, and the RST pin of the main chip U1, respectively, as a signal selection signal for the control unit 3; one end of the eighth resistor R17 is connected to the first pin (RO pin) of the communication chip U3, and the RXD2 pin of the main chip U1, respectively, as a receive signal for the main chip U1; the fourth pin (DI pin) of the communication chip U3 is connected to the TXD2 pin (data transmit pin) of the main chip U1, as a transmit signal for the main chip U1; the sixth pin (A pin) of the communication chip U3 is connected to one end of the fourth resistor R12 and one end of the sixth resistor R14, respectively; the seventh pin (B pin) of the communication chip U3 is connected to one end of the ninth resistor R18 and one end of the eleventh resistor R20, respectively. The other end of the sixth resistor R14 is connected to one end of the seventh resistor R15 and the third pin of the common-mode inductor L10; the other end of the eleventh resistor R20 is connected to one end of the tenth resistor R19 and the fourth pin of the common-mode inductor L10; the other end of the seventh resistor R15 is connected to the first pin of the common-mode inductor L10, the first pin of the TVS diode D2, and the other end of the fourth ferrite bead; the other end of the tenth resistor R19 is connected to the second pin of the common-mode inductor L10, the second pin of the TVS diode D2, and the other end of the third ferrite bead; the other end of the fourth resistor R12, the other end of the eighth resistor R17, and one end of the seventh capacitor C7 are all connected to the operating power supply; the other end of the ninth resistor R18, the other end of the seventh capacitor C7, the other end of the fifth resistor R13, and the third pin of the TVS diode D2 are all grounded.

[0069] In one alternative implementation, the other end of the fourth resistor R12, the other end of the eighth resistor R17, and one end of the seventh capacitor C7 are all connected to the operating power supply of the drain output of the first MOSFET U2.

[0070] In one alternative implementation, such as Figure 6 and Figure 7As shown, the display and drive unit 4 comprises: a liquid crystal screen interface JP2, a liquid crystal screen backlight interface JP3, a second MOS tube Q6, a twelfth resistor R21, a thirteenth resistor R22, a fourteenth resistor R23, a fifteenth resistor R24, a sixteenth resistor R25, a twelfth resistor R31, a thirteenth resistor R32, an eighth capacitor C8, a ninth capacitor C9, a first triode Q1, a second triode Q2, a third triode Q3, a fourth triode Q4, a fifth triode Q5, a first light emitting diode LED1, a second light emitting diode LED2, a third light emitting diode LED3, a fourth light emitting diode LED4, and a fifth light emitting diode LED5.

[0071] Specifically, one end of the thirteenth resistor R32 is connected to the CLED pin (control output signal) of the main chip U1, the other end of the thirteenth resistor R32 is connected to the gate of the second MOS tube Q6, the drain of the second MOS tube Q6 is connected to the cathode (K end) of the liquid crystal screen backlight interface JP3, the source of the second MOS tube Q6 is grounded, one end of the twelfth resistor R31 is connected to the anode (D end) of the liquid crystal screen backlight interface JP3, the other end of the twelfth resistor R31 is connected to the drain (D end) of the first MOS tube U2; the first pin and the seventh pin of the liquid crystal screen interface JP2 are connected to the working power supply, the fourth pin and the fifth pin are connected to the two ends of the ninth capacitor C9, and the third pin is connected to one end of the eighth capacitor C8; the other end of the eighth capacitor C8, the second pin and the sixth pin of the liquid crystal screen interface JP2 are grounded; the eighth pin to the twentieth pin of the liquid crystal screen interface JP2 are connected to the main chip U1.

[0072] The bases of the first light emitting diode LED1, the second light emitting diode LED2, the third light emitting diode LED3, the fourth light emitting diode LED4, and the fifth light emitting diode LED5 are connected to the main chip U1 through a resistor, the emitters are connected to the working power supply through a resistor, and the collectors are grounded through a light emitting diode, corresponding to the first triode Q1, the second triode Q2, the third triode Q3, the fourth triode Q4, and the fifth triode Q5, respectively.

[0073] In an alternative embodiment, as shown in Figure 8 the key unit 5 comprises: 8 resistors and 8 keys.

[0074] One end of each key is commonly grounded, and the other end of each key is connected to the main chip and a resistor, respectively, and the other end of the resistor is commonly connected to the working power supply.

[0075] Specifically includes: the fourteenth resistance R7, the fifteenth resistance R8, the sixteenth resistance R9, the seventeenth resistance R10, the eighteenth resistance R11, the nineteenth resistance R5, the twentieth resistance R4, the twenty-first resistance R6, the first button S1, the second button S2, the third button S3, the fourth button S4, the fifth button S5, the sixth button S6, the seventh button S7, the eighth button S8.

[0076] Wherein, one end of the fourteenth resistance R7 is connected with one end of the first button S1 and the signal input pin (KEY START A pin) of the main chip U1 respectively, one end of the fifteenth resistance R8 is connected with one end of the second button S2 and the signal input pin (KEY START B pin) of the main chip U1 respectively, one end of the sixteenth resistance R9 is connected with one end of the third button S3 and the signal input pin (KEY STOP pin) of the main chip U1 respectively, one end of the seventeenth resistance R10 is connected with one end of the fourth button S4 and the signal input pin (KEY RESET pin) of the main chip U1 respectively, one end of the eighteenth resistance R11 is connected with one end of the fifth button S5 and the signal input pin (KEY RETURN pin) of the main chip U1 respectively, one end of the nineteenth resistance R5 is connected with one end of the sixth button S6 and the signal input pin (KEY ENTER pin) of the main chip U1 respectively, one end of the twentieth resistance R4 is connected with one end of the seventh button S7 and the signal input pin (KEY DOWN pin) of the main chip U1 respectively, one end of the twenty-first resistance R6 is connected with one end of the eighth button S8 and the signal input pin (KEY UP pin) of the main chip U1 respectively; the other end of the fourteenth resistance R7, the other end of the fifteenth resistance R8, the other end of the sixteenth resistance R9, the other end of the seventeenth resistance R10, the other end of the eighteenth resistance R11, the other end of the nineteenth resistance R5, the other end of the twentieth resistance R4, the other end of the twenty-first resistance R6 are connected with the working power supply; the other end of the button S1, the other end of the button S2, the other end of the button S3, the other end of the button S4, the other end of the button S5, the other end of the button S6, the other end of the button S7, the other end of the button S8 are commonly grounded.

[0077] Although the example embodiments and their advantages have been described in detail, but those skilled in the art can make various changes, replacements and modifications to these embodiments without departing from the spirit of the present application and the scope of the defined protection, such modifications and variations all fall within the scope defined by the present application.

Claims

1. A display circuit for controlling and protecting switching electrical appliances, characterized in that, include: Signal interface unit, communication unit, display and drive unit, and control unit; The signal interface unit is connected to the communication unit and is used to establish information interaction between the CPS controller and the communication unit; The communication unit is connected to the control unit and is used to obtain the signal to be displayed from the CPS controller through the signal interface unit, and to output the signal to be displayed to the control unit after isolation and transformation. The control unit is used to analyze and process the isolated and transformed signal to be displayed and then generate a corresponding display driving signal. The display and driving unit is connected to the control unit and is used to display corresponding information according to the display driving signal.

2. The display circuit according to claim 1, characterized in that, Also includes: Button unit; The button unit is connected to the control unit and is used to send a corresponding operation signal to the control unit according to the triggered button operation; The control unit is also used to encode the operation signal and send it to the communication unit; The communication unit is also used to convert the operation signal into a format that conforms to the communication protocol and then send it to the CPS controller through the signal interface unit.

3. The display circuit according to claim 2, characterized in that, Also includes: Power buffer unit; The power buffer unit is connected to the signal interface unit, communication unit, control unit, display and drive unit, and key unit, respectively. It is used to obtain the power signal of the CPS controller through the signal interface unit, and to output the power signal to the signal interface unit, communication unit, control unit, display and drive unit, and key unit respectively after transformation processing.

4. The display circuit according to claim 3, characterized in that, The signal interface unit includes: a network port, a first ferrite bead, a second ferrite bead, a third ferrite bead, a fourth ferrite bead, a fifth ferrite bead, a sixth ferrite bead, a seventh ferrite bead, and an eighth ferrite bead; The first pin of the network port is connected to one end of the fourth and fifth ferrite beads respectively; the second pin of the network port is connected to one end of the third and sixth ferrite beads respectively; the seventh pin of the network port is connected to one end of the second and seventh ferrite beads respectively; the eighth pin of the network port is connected to one end of the first and eighth ferrite beads respectively; the other end of the fifth ferrite bead is connected to the other ends of the sixth, seventh and eighth ferrite beads respectively and is directly grounded; the other ends of the third and fourth ferrite beads are both connected to the communication unit; the other end of the first ferrite bead is connected to the power buffer unit; and the other end of the second ferrite bead is directly grounded.

5. The display circuit according to claim 4, characterized in that, The power buffer unit includes: a fuse, a first MOSFET, a diode, a first resistor, a second resistor, an inductor, a first capacitor, a second capacitor, and a third capacitor; One end of the fuse is connected to the other end of the first ferrite bead. The other end of the fuse is connected to one end of the diode, one end of the first capacitor, and one end of the inductor. The other end of the first capacitor is connected to one end of the first resistor. The other end of the first resistor is connected to the other end of the diode, one end of the second resistor, and the gate (G) terminal of the first MOSFET. The other end of the inductor is connected to the source (S) terminal of the first MOSFET. The other end of the second resistor is grounded. The drain (D) terminal of the first MOSFET is connected to one end of the second capacitor and one end of the third capacitor. The other ends of the second capacitor and the third capacitor are both grounded.

6. The display circuit according to claim 5, characterized in that, The control unit includes: a main chip, a fourth capacitor, a fifth capacitor, a sixth capacitor, and a third resistor; The reset pin of the main chip is connected to one end of the third resistor and one end of the fourth capacitor; the other end of the third resistor is connected to the operating power supply; the other end of the fourth capacitor is grounded; one end of the fifth capacitor and one end of the sixth capacitor are both connected to the operating power supply pin of the main chip, and the other ends of the fifth capacitor and the sixth capacitor are both connected to the ground pin of the main chip.

7. The display circuit according to claim 6, characterized in that, The communication unit includes: a communication chip, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a TVS diode, a common-mode inductor, and a seventh capacitor; One end of the fifth resistor is connected to the second and third pins of the communication chip and the RST pin of the main chip, respectively. One end of the eighth resistor is connected to the first pin of the communication chip and the RXD2 pin of the main chip, respectively. The fourth pin of the communication chip U3 is connected to the TXD2 pin of the main chip, respectively. The sixth pin of the communication chip is connected to one end of the fourth resistor and one end of the sixth resistor, respectively. The seventh pin of the communication chip is connected to one end of the ninth resistor and one end of the eleventh resistor, respectively. The other end of the sixth resistor is connected to one end of the seventh resistor and the third pin of the common-mode inductor, respectively. The other end of the eleventh resistor is connected to one end of the tenth resistor and the fourth pin of the common-mode inductor, respectively. The other end of the seventh resistor is connected to the first pin of the common-mode inductor, the first pin of the TVS diode, and the other end of the fourth ferrite bead, respectively. The other end of the tenth resistor is connected to the second pin of the common-mode inductor, the second pin of the TVS diode, and the other end of the third ferrite bead, respectively. The other ends of the fourth resistor, the eighth resistor, and the seventh capacitor are all connected to the operating power supply. The other ends of the ninth resistor, the seventh capacitor, the other resistor, and the third pin of the TVS diode are all grounded.

8. The display circuit according to claim 7, characterized in that, The button unit includes: 8 resistors and 8 buttons; One end of each button is grounded, and the other end of each button is connected to the main chip and a resistor, with the other ends of the resistors connected to the operating power supply.

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