Display circuit for controlling and protecting switching device

Abstract

The invention 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 invention, 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 occurrence point can be remotely and rapidly positioned.

Description

Technical Field

[0001] The present invention relates to the technical field of displays, and in particular to a display circuit for controlling and protecting a switch electrical appliance. Background Art

[0002] In the related technology, control and protective switching devices (CPS) are widely used in industrial production and power transmission. They usually adopt an integrated structure design, integrating functional modules such as data display and parameter setting on the CPS controller. However, for applications in distribution cabinets or drawers, or even in some high-demand environments that require enclosed spaces, the integrated structure of the CPS is not conducive to the commissioning and maintenance of the staff. Summary of the invention

[0003] In view of this, an embodiment of the present invention provides a display circuit for controlling and protecting a switchgear to solve the technical problem in the related art that an integrated CPS is not conducive to debugging and maintenance by personnel when applied to a distribution cabinet or drawer, or even in some high-demand use environments that require a closed space.

[0004] The present invention provides a display circuit for controlling and protecting a switch electrical appliance, comprising: a signal interface unit, a communication unit, a display and drive unit and a control unit;

[0005] 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;

[0006] 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 isolate and transform the signal to be displayed and then output it to the control unit;

[0007] The control unit is used to generate a corresponding display driving signal after analyzing and processing the to-be-displayed signal after isolation and transformation;

[0008] The display and drive unit is connected to the control unit and is used to display corresponding information according to the display drive signal.

[0009] In an optional implementation, it further includes: a button unit;

[0010] 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;

[0011] The control unit is also used to encode the operation signal and send it to the communication unit;

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

[0013] In an optional implementation, it further includes: a power buffer unit;

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

[0015] In an optional implementation, the signal interface unit includes: 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] The first pin of the network port is connected to one end of the fourth magnetic bead and the fifth magnetic bead respectively; the second pin of the network port is connected to one end of the third magnetic bead and the sixth magnetic bead respectively; the seventh pin of the network port is connected to one end of the second magnetic bead and the seventh magnetic bead respectively; the eighth pin of the network port is connected to one end of the first magnetic bead and the eighth magnetic bead respectively; the other end of the fifth magnetic bead is connected to 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 respectively and directly grounded, the other end of the third magnetic bead and the other end of the fourth magnetic bead are both connected to the communication unit, the other end of the first magnetic bead is connected to the power buffer unit, and the other end of the second magnetic bead is directly grounded.

[0017] In an optional implementation, the power buffer unit includes: 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 to the other end of the first magnetic bead, the other end of the fuse is respectively 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 respectively connected to the other end of the diode, one end of the second resistor, and the G end of the first MOS tube; the other end of the inductor is connected to 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 respectively connected to one end of the second capacitor and one end of the third capacitor, and the other end of the second capacitor and the other end of the third capacitor are both grounded.

[0019] In an optional implementation, the control unit includes: 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 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 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 both connected to the working power pin of the main chip, and the other end of the fifth capacitor and the other end of the sixth capacitor are both connected to the ground pin of the main chip.

[0021] In an optional implementation, 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 tube, a common mode inductor, and a seventh capacitor;

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

[0023] In an optional implementation, the button unit includes: 8 resistors and 8 buttons;

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

[0025] It can be seen from the above technical solutions that the present invention has the following advantages:

[0026] The embodiment of the present invention can realize signal transmission between the CPS controller and the communication unit by setting up a signal interface unit. The signal to be displayed transmitted by the CPS controller is first isolated and transformed by the communication unit to eliminate signal interference and improve communication quality and stability, and then analyzed and processed by the control unit to analyze and decode the received original signal to be displayed and convert it into useful information, and generate corresponding display driving signals according to the useful information to drive the display and drive unit to display corresponding information, so as to realize real-time display of CPS related data, thereby facilitating the staff to remotely monitor the status of the CPS in real time and perform necessary debugging, or when a failure occurs in the CPS, the fault point can be quickly located remotely, thereby improving the maintenance efficiency and cost of the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a structural schematic diagram of a display circuit of a control and protection switch electrical appliance provided by an embodiment of the present invention;

[0029] Figure 2 is a circuit schematic diagram of a signal interface unit provided by an embodiment of the present invention;

[0030] Figure 3 is a circuit schematic diagram of a power buffer unit provided in an embodiment of the present invention;

[0031] Figure 4 is a circuit schematic diagram of a control unit provided by an embodiment of the present invention;

[0032] Figure 5 is a circuit schematic diagram of a communication unit provided by an embodiment of the present invention;

[0033] Figure 6 is a partial circuit schematic diagram of a display and drive unit provided in an embodiment of the present invention;

[0034] Figure 7 is another circuit schematic diagram of a display and drive unit provided in an embodiment of the present invention;

[0035] Figure 8 It is a circuit principle diagram of a key unit provided in an embodiment of the present invention. Description of the 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, the second resistor; R1, the third resistor; R12, the fourth resistor; R13, the fifth resistor; R14, the sixth resistor; R15, the seventh resistor; R17, the eighth resistor; R18, the ninth resistor; R19, the tenth resistor; R20, the eleventh resistor; R31, the twelfth resistor; R32, the thirteenth resistor; R7, the fourteenth resistor; R8, the fifteenth resistor; R9, the sixteenth resistor; R10, the seventeenth resistor; R11, the eighteenth resistor; R5, the nineteenth resistor Resistance; R4, the twentieth resistor; R6, the twenty-first resistor; L9, the inductor; C2, the first capacitor; C3, the second capacitor; C4, the third capacitor; C1, the fourth capacitor; C5, the fifth capacitor; C6, the sixth capacitor; C7, the seventh capacitor; C8, the eighth capacitor; C9, the ninth capacitor; U1, the main chip; D2, the TVS tube; U3, the communication chip; L10, the common mode inductor; JP2, the LCD interface; JP3, the LCD backlight interface; Q1, the first transistor; Q2, the second transistor; Q3, the third transistor; Q4, the fourth transistor; Q5, the fifth transistor; LED1, the first light-emitting diode; LED2, the second light-emitting diode; LED3, the third light-emitting diode; LED4, the fourth light-emitting diode; LED5, the fifth light-emitting diode; S1, the first button; S2, the second button; S3, the third button; S4, the fourth button; S5, the fifth button; S6, the sixth button; S7, the seventh button; S8, the eighth button. DETAILED DESCRIPTION

[0038] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only 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 ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0040] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can also be the internal connection of two components, it can be a wireless connection, or it can be a wired connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0042] The embodiment of the present invention provides a display circuit of a control and protective switching device, which is independently arranged from a control and protective switching device (CPS for short) and exchanges information with the CPS in a wired or wireless manner.

[0043] Figure 1 is a schematic diagram of a control and protection switch electrical appliance structure according to an embodiment of the present invention. Figure 1 As shown, an embodiment of the present invention provides a display circuit for controlling and protecting a switch electrical appliance, comprising: a signal interface unit 1 , a communication unit 2 , a display and drive unit 4 and a control unit 3 .

[0044] Specifically, the signal interface unit 1 is connected to the communication unit 2, and the signal interface unit 1 is used to establish information interaction between the CPS controller and the communication unit 2; the communication unit 2 is connected to the control unit 3, and the communication unit 2 is used to obtain the signal to be displayed of the CPS controller through the signal interface unit 1, and output the signal to be displayed to the control unit 3 after isolating and transforming the signal to be displayed; the control unit 3 is used to analyze and process the signal to be displayed after the isolation and transformation to generate a corresponding display driving signal; the display and driving unit 4 is connected to the control unit 3, and the display and driving unit 4 is used to display corresponding information according to the display driving signal.

[0045] The embodiment of the present invention can realize signal transmission between the CPS controller and the communication unit by setting up a signal interface unit. The signal to be displayed transmitted by the CPS controller is first isolated and transformed by the communication unit to eliminate signal interference and improve communication quality and stability, and then analyzed and processed by the control unit to analyze and decode the received original signal to be displayed and convert it into useful information, and generate corresponding display driving signals according to the useful information to drive the display and drive unit to display corresponding information, so as to realize real-time display of CPS related data, thereby facilitating the staff to remotely monitor the status of the CPS in real time and perform necessary debugging, or when a failure occurs in the CPS, the fault point can be quickly located remotely, thereby improving the maintenance efficiency and cost of the staff.

[0046] In an optional implementation, the display circuit of the control and protection switch electrical appliance further includes: a button unit 5.

[0047] Specifically, the button unit 5 is connected to the control unit 3, and is used to send a corresponding operation signal to the control unit 3 according to the triggered button operation; the control unit 3 is also used to encode the operation signal and send it to the communication unit 2; the communication unit 2 is also used to convert the operation signal into a format that complies with the communication protocol and send it 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 will be triggered. At this time, the key unit 5 can send the corresponding operation signal to the control unit 3 according to the triggered key operation, and then the operation signal is encoded by the control unit 3, and then converted to the protocol format by the communication unit 2 and output to the CPS controller. The operation signal after encoding and protocol format conversion can be used as a request for related operations such as data query and modification of the CPS controller to realize remote debugging.

[0049] In an optional implementation, the display circuit of the control and protection switch electrical appliance further includes: a power buffer unit 6 .

[0050] Specifically, the power buffer unit 6 is respectively connected to the signal interface unit 1, the communication unit 2, the control unit 3, the display and drive unit 4 and the button unit 5. The power buffer unit 6 is used to obtain the power signal of the CPS controller through the signal interface unit 1, and transform the power signal and output it to the signal interface unit, the communication unit, the control unit, the display and drive unit and the button unit respectively.

[0051] The power input of the power buffer unit 6 in the embodiment of the present invention is the power signal transmitted by the CPS controller through the signal interface unit. The power buffer unit 6 then transforms and processes the power signal to obtain a power supply suitable for the signal interface unit, the communication unit, the control unit, the display and drive unit, and the button unit to power the aforementioned units.

[0052] In addition, the power buffer unit 6 of the embodiment of the present invention can implement hot-swap operation, which is convenient for installation and debugging, and can also absorb excessive impact current caused by hot-swap operation.

[0053] In an optional embodiment, if Figure 2 As shown, the signal interface unit 1 includes: 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, the first pin of the network port RJ1 is connected to one end of the fourth magnetic bead L4 and the fifth magnetic bead L5 respectively; the second pin of the network port RJ1 is connected to one end of the third magnetic bead L3 and the sixth magnetic bead L6 respectively; the seventh pin of the network port RJ1 is connected to one end of the second magnetic bead L2 and the seventh magnetic bead L7 respectively; the eighth pin of the network port RJ1 is connected to one end of the first magnetic bead L1 and the eighth magnetic bead L8 respectively; 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 respectively and directly grounded, the other end of the third magnetic bead L3 and the other end of the fourth magnetic bead L4 are both 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] Among them, the network port is preferably 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 implementation, the other end of the first magnetic bead L1 is the display working power input power, that is, the power signal transmitted from the CPS controller through the signal interface unit 1 .

[0058] In an optional implementation, 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, if Figure 3As shown, the power buffer unit 6 includes: 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 to the other end of the first magnetic bead L1, and the other end of the fuse F1 is respectively connected to one end of the diode D1, one end of the first capacitor C2, and one end of the inductor L9, the other end of the first capacitor C2 is connected to one end of the first resistor R2, and the other end of the first resistor R2 is respectively connected to the other end of the diode D1, one end of the second resistor R3, and the G end of the first MOS tube U2; the other end of the inductor L9 is connected to the S end of the first MOS tube U2, the other end of the second resistor R3 is grounded, and the D end of the first MOS tube U2 is respectively connected to one end of the second capacitor C3 and one end of the third capacitor C4, and serves as the working power 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] The fuse F1 is preferably a resettable fuse.

[0062] In an optional implementation, the other end of the fuse F1 is connected to the cathode of the diode D1, and the other end of the first resistor R2 is connected to the anode of the diode D1 and one end of the second resistor R3.

[0063] Among them, 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 optional implementation, the first MOS tube U2 has 1 G terminal, 3 S terminals, and 4 D terminals. The other end of the inductor L9 is connected to the three S terminals of the first MOS tube U2, and the four D terminals of the first MOS tube U2 are connected to one end of the second capacitor C3 and one end of the third capacitor C4, which can be used as the working power output of each unit in the display.

[0065] In an optional embodiment, if Figure 4 As shown, the control unit 3 includes: 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 to 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 to 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 to the working power 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 to the ground pin of the main chip U1.

[0067] In an optional embodiment, if 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 tube D2, a common mode inductor L10, and a seventh capacitor C7.

[0068] Specifically, one end of the fifth resistor R13 is respectively 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, as a signal selection signal with the control unit 3; one end of the eighth resistor R17 is respectively connected to the first pin (RO pin) of the communication chip U3 and the RXD2 pin of the main chip U1, as a receiving signal of the main chip U1; the fourth pin (DI pin) of the communication chip U3 is connected to the TXD2 pin (data sending pin) of the main chip U1, as a sending signal of the main chip U1; the sixth pin (A pin) of the communication chip U3 is respectively connected to one end of the fourth resistor R12 and one end of the sixth resistor R14; the seventh pin (B pin) of the communication chip U3 is respectively connected to one end of the ninth resistor R18 and one end of the eleventh resistor R20. The other end of the sixth resistor R14 is respectively 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 respectively 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 respectively connected to the first pin of the common-mode inductor L10, the first pin of the TVS tube D2, and the other end of the fourth magnetic bead; the other end of the tenth resistor R19 is respectively connected to the second pin of the common-mode inductor L10, the second pin of the TVS tube D2, and the other end of the third magnetic 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 working 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 tube D2 are all grounded.

[0069] In an optional 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 working power supply of the D-level output of the first MOS tube U2.

[0070] In an optional embodiment, if Figure 6 and Figure 7As shown, the display and driving unit 4 includes: a liquid crystal screen interface JP2, a liquid crystal screen backlight interface JP3, a second MOS tube Q6, a twelfth resistor R21, 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 transistor Q1, a second transistor Q2, a third transistor Q3, a fourth transistor Q4, a fifth transistor 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 LCD 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 LCD backlight interface JP3, and 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 LCD interface JP2 are both connected to the working power supply, the fourth pin and the fifth pin are both 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 LCD interface JP2 are all grounded; the eighth pin to the twentieth pin of the LCD interface JP2 are all 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 all connected to the main chip U1 through a resistor, the emitters are all connected to the working power supply through a resistor, and the collectors are all 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 optional embodiment, if Figure 8 As shown, the key unit 5 includes: 8 resistors and 8 keys;

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

[0075] Specifically including: the fourteenth resistor R7, the fifteenth resistor R8, the sixteenth resistor R9, the seventeenth resistor R10, the eighteenth resistor R11, the nineteenth resistor R5, the twentieth resistor R4, the twenty-first resistor 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, and the eighth button S8.

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

[0077] Although example embodiments and their advantages have been described in detail, those skilled in the art may make various changes, substitutions and modifications to these embodiments without departing from the spirit and defined scope of the present invention, and such modifications and variations are all within the defined scope.

Claims

1. A display circuit for controlling and protecting a switch electrical appliance, 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 isolate and transform the signal to be displayed and then output it to the control unit; The control unit is used to generate a corresponding display driving signal after analyzing and processing the to-be-displayed signal after isolation and transformation; The display and drive unit is connected to the control unit and is used to display corresponding information according to the display drive signal.

2. The display circuit according to claim 1, characterized in that: Also includes: Key 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 complies with the communication protocol and 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, the communication unit, the control unit, the display and drive unit, and the key unit, respectively, and is used to obtain the power signal of the CPS controller through the signal interface unit, and to transform and process the power signal and output it to the signal interface unit, the communication unit, the control unit, the display and drive unit, and the key unit, respectively.

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

5. The display circuit according to claim 4, characterized in that: The power buffer unit includes: 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; One end of the fuse is connected to the other end of the first magnetic bead, the other end of the fuse is respectively 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 respectively connected to the other end of the diode, one end of the second resistor, and the G end of the first MOS tube; the other end of the inductor is connected to 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 respectively connected to one end of the second capacitor and one end of the third capacitor, and the other end of the second capacitor and the other end of 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 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 both connected to the working power pin of the main chip, and the other end of the fifth capacitor and the other end of 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 tube, a common mode inductor, and a seventh capacitor; One end of the fifth resistor is respectively connected to the second pin and the third pin of the communication chip and the RST pin of the main chip, one end of the eighth resistor is respectively connected to the first pin of the communication chip and the RXD2 pin of the main chip, the fourth pin of the communication chip U3 is connected to the TXD2 pin of the main chip, and the sixth pin of the communication chip is respectively connected to one end of the fourth resistor and one end of the sixth resistor; the seventh pin of the communication chip is respectively connected to one end of the ninth resistor and one end of the eleventh resistor; the other end of the sixth resistor is respectively connected to one end of the seventh resistor and the third pin of the common mode inductor; the other end of the eleventh resistor is respectively connected to one end of the tenth resistor and the fourth pin of the common mode inductor; the other end of the seventh resistor is respectively connected to the first pin of the common mode inductor, the first pin of the TVS tube, and the other end of the fourth magnetic bead; the other end of the tenth resistor is respectively connected to the second pin of the common mode inductor, the second pin of the TVS tube, and the other end of the third magnetic bead; the other end of the fourth resistor, the other end of the eighth resistor, and one end of the seventh capacitor are all connected to 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 all grounded.

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

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