Electric vehicle system

Abstract

According to the electric vehicle system, after the whole vehicle is powered on, the signal generator in the fuse box sends the square wave signal to the controller, the controller enters the working state after receiving the square wave signal, and the controller controls the indicator lamp on the instrument panel to be turned on after entering the working state; when the indicating lamp on the instrument panel is turned on, the controller works normally. If the signal generator does not send a square wave signal to the controller and the controller does not receive the square wave signal, the controller does not work, the indicator lamp on the instrument panel cannot be controlled to be turned on, the safety state of the electric vehicle can be observed according to the indicator lamp on the instrument panel, and the controller works according to the working state of the signal generator in the fuse box. It can be determined that the fuse is connected to a vehicle system, and vehicle safety is guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of electric vehicles, and in particular to an electric vehicle system. Background Art

[0002] In recent years, the volume of electric vehicles in my country has been growing, and the safety of electric vehicles has attracted national attention. Nowadays, electric vehicles on the market can still run normally without installing the power fuse box. Once an abnormality occurs during the charging and discharging process, the entire vehicle circuit fails to be powered off in time, which may cause the vehicle to burn at the least, or even cause fire and other accidents at the worst. Utility Model Content

[0003] In view of this, the purpose of this application is to propose an electric vehicle system to solve part or all of the technical problems in the background technology.

[0004] Based on the above objectives, the present application provides an electric vehicle system, including:

[0005] A control and display module, comprising a connected instrument panel, a controller and a power supply module, wherein the instrument panel is provided with an indicator light, and the indicator light is connected to the controller;

[0006] The fuse box module comprises a fuse box and a signal generator arranged in the fuse box, wherein the signal generator is electrically connected to the controller box power supply module respectively, and the controller receives a square wave signal from the signal generator to enter a working state, thereby controlling the indicator light to light up.

[0007] Optionally, the instrument panel includes a main switch circuit, an indicator light, a ball switch circuit, a wheel module circuit, a solenoid valve circuit, an IO circuit, and an electric door lock detection circuit connected to the controller.

[0008] Optionally, the control and display module further includes a communication module circuit connected to the controller, and the communication module circuit is electrically connected to the internal circuit of the fuse box.

[0009] Optionally, the controller includes an MCU chip, a U5 chip and a J12 chip connected to each other, and the J12 chip is connected to the MCU chip via a SWCLK interface and a SWDIO interface.

[0010] Optionally, the power supply module includes a U2 chip and a voltage conversion chip U1, the 5th and 6th pins of the U2 chip are connected to the battery through the interface BAT+, the U2 chip is connected to the 3rd pin of the U1 chip through the 5V power supply terminal, and the 2nd pin of the U1 chip outputs a 3.3V power supply and is connected to the MCU chip.

[0011] Optionally, the communication module circuit includes a diode D10, a diode D12, a resistor R53, and a capacitor C44. The first electrode of the diode D10 is connected to the 22nd pin of the MCU chip through the CTRL_485 interface and the YXT interface, and the second electrode of the diode D10 is connected to the internal circuit of the fuse box through YXT.

[0012] Optionally, the internal circuit of the fuse box includes a U1 chip and a U12 chip, the U1 chip is connected to the power supply end of the U12 chip, the 8th pin of the U12 chip is connected to a resistor R125 and a diode D43 in series through a YXT OUT interface, and one electrode of D43 is connected to the second electrode of the diode D10 of the communication module through an interface YXT interface.

[0013] Optionally, the signal generator includes a controller chip, a resistor R26, a resistor R27, and a capacitor C29. The first electrodes of the resistors R26 and R27 are connected to the controller chip, the second electrode of the resistor R26 is connected to a 5V power supply, the second electrode of the resistor R27 is connected to the first electrode of the capacitor C29, an output terminal for outputting a square wave signal is provided between the second electrode of the resistor R27 and the first electrode of the capacitor C29, and the second electrode of the capacitor C29 is grounded.

[0014] From the above, it can be seen that the electric vehicle system provided by the present application, after the whole vehicle is powered on, the signal generator in the fuse box sends a square wave signal to the controller, and the controller enters the working state after receiving the square wave signal. After the controller enters the working state, it will control the indicator light on the instrument panel to light up. When the indicator light on the instrument panel lights up, it means that the controller is working normally. If the signal generator does not send a square wave signal to the controller, and the controller does not receive the square wave signal, the controller does not work, and then it cannot control the indicator light on the instrument panel to light up. The safety status of the electric vehicle can be observed according to the indicator light on the instrument panel. When the controller works according to the signal generator in the fuse box, it can determine that the fuse is connected to the whole vehicle system to ensure the safety of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the present application or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 A schematic diagram of the structure of an electric vehicle system according to an embodiment of the present application;

[0017] Figure 2 This is an internal circuit diagram of a fuse box according to an embodiment of the present application;

[0018] Figure 3 A circuit diagram of a signal generator according to an embodiment of the present application;

[0019] Figure 4 A circuit diagram of a controller according to an embodiment of the present application;

[0020] Figure 5 A circuit diagram of a power supply module according to an embodiment of the present application;

[0021] Figure 6 This is a main switch circuit diagram of an embodiment of the present application;

[0022] Figure 7 This is a circuit diagram of an indicator light according to an embodiment of the present application;

[0023] Figure 8 A circuit diagram of a ball switch according to an embodiment of the present application;

[0024] Fig. 9 This is a circuit diagram of a wheel module according to an embodiment of the present application;

[0025] Fig.10 A solenoid valve circuit diagram of an embodiment of the present application;

[0026] Fig.11 This is an IO circuit diagram of an embodiment of the present application;

[0027] Fig.12 This is the electric door lock detection circuit diagram of the embodiment of the present application

[0028] Fig.13 This is a circuit diagram of a lock motor according to an embodiment of the present application;

[0029] Fig.14 A circuit diagram of a communication module according to an embodiment of the present application;

[0030] Fig.15 Other circuit diagrams of embodiments of the present application.

[0031] In the attached figure:

[0032] 1. Controller; 2. Instrument panel; 3. Fuse box; 4. Communication module; 5. Power supply module; 31. Signal generator; 21. Main switch circuit; 22. Indicator light; 23. Ball switch circuit; 24. Wheel module circuit; 25. Solenoid valve circuit; 26. IO circuit; 27. Electric door lock detection circuit; 28. Lock motor circuit. DETAILED DESCRIPTION

[0033] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0034] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be the usual meanings understood by people with ordinary skills in the field to which the present application belongs. The "first", "second" and similar words used in the embodiments of the present application do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0035] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0036] like Figure 1 As shown, the utility model provides an electric vehicle system, comprising:

[0037] A control and display module, comprising a connected instrument panel 2, a controller 1 and a power supply module 5, wherein the instrument panel 2 is provided with an indicator light 22, and the indicator light 22 is connected to the controller 1;

[0038] The fuse box 3 module includes a fuse box 3 and a signal generator 31 arranged in the fuse box 3. The signal generator 31 is electrically connected to the controller 1 and the power supply module 5 respectively. The controller 1 receives the square wave signal of the signal generator 31 and enters the working state to control the indicator light 22 to light up.

[0039] Specifically, after the vehicle is powered on, the signal generator 31 in the fuse box 3 sends a square wave signal to the controller 1. After the controller 1 receives the square wave signal, it enters the working state. After the controller 1 enters the working state, it controls the indicator light 22 on the instrument panel 2 to light up. When the indicator light 22 on the instrument panel 2 lights up, it means that the controller 1 is working normally. If the signal generator 31 does not send a square wave signal to the controller 1 and the controller 1 does not receive the square wave signal, the controller 1 does not work, and then the indicator light 22 on the instrument panel 2 cannot be controlled to light up. The safety state of the electric vehicle can be observed according to the indicator light 22 on the instrument panel 2. When the controller 1 works according to the signal generator 31 in the fuse box 3, it can be determined that the fuse is connected to the vehicle system to ensure the safety of the vehicle.

[0040] In some embodiments, the controller 1 includes an MCU chip, a U5 chip, and a J12 chip connected to each other, and the J12 chip is connected to the MCU chip via a SWCLK interface and a SWDIO interface.

[0041] Specifically, the J12 chip is a plug-in terminal for plugging in a connecting wire.

[0042] In some embodiments, Figure 4 and Figure 5 As shown, the power supply module 5 includes a U2 chip and a voltage conversion chip U1. The 5th and 6th pins of the U2 chip are connected to the battery through the interface BAT+, the U2 chip is connected to the 3rd pin of the U1 chip through the 5V power supply terminal, and the 2nd pin of the U1 chip outputs a 3.3V power supply and is connected to the MCU chip.

[0043] Among them, a diode D2 is connected in series between the 5th pin of the U2 chip and the BAT+ interface, a diode D1 is connected between the diode D2 and the BAT+ interface, and one electrode of the diode D1 is provided with a 48V power supply terminal; a capacitor C8 is connected between the diode and the 5th pin of the U2 chip, and one electrode of the capacitor C8 is grounded; the 8th pin of the U2 chip is connected to the 1st pin, and a diode D3 is connected therebetween, one electrode of the diode D3 is grounded and connected to one electrode of the capacitor C8, a capacitor C10 is connected in series between the other electrode of the diode D3 and the 3rd pin of the U2 chip, an inductor L1 is connected between the capacitor C10 and the other electrode of the diode D3, the other electrode of the inductor L1 is connected with a diode D1 and a capacitor C9 connected in series, one electrode of the diode D1 is connected to the 3rd pin of the U2 chip, one electrode of the capacitor C9 is grounded, a 5V power supply terminal is provided between the diode D1 and the capacitor C9, the 5V power supply terminal is also connected to a capacitor C17, and one electrode of the capacitor C17 is grounded.

[0044] In some embodiments, Figures 6 to 13 As shown, the instrument panel 2 includes a main switch circuit 21 connected to the controller 1, an indicator light 22, a ball switch circuit 23, a wheel module circuit 24, a solenoid valve circuit 25, an IO circuit 26, and an electric door lock detection circuit 27.

[0045] Specifically, Figure 4 and Figure 6As shown, the main switch circuit 21 includes a transistor Q4, a resistor R23, a resistor R24, a resistor R26, a resistor R17, a transistor Q5, a resistor R21, a transistor Q1, a resistor R11, a capacitor C23, a resistor R10, a transistor Q2, a resistor R15, a resistor R7, a capacitor C18, a resistor R8, and a resistor R9, wherein the resistor R7 and the resistor R9 are connected in series, an electrode of the resistor R7 is provided with an ACC interface connected to the key interface end of the tram, an electrode of the resistor R9 is provided with an acc_in interface, the transistor Q4, the resistor R23, the resistor R24, the resistor R26, resistor R17, transistor Q5, and resistor R21 are connected between resistor R7 and the ACC interface, and are provided with an acc_pwm interface; transistor Q1, resistor R11, capacitor C23, resistor R10, transistor Q2, resistor R15 are connected between resistor R7 and the ACC interface, and are provided with an acc_out interface; connected to the corresponding 47th, 44th, and 45th pins of the MCU chip through the acc_in interface, acc_pwm interface, and acc_out interface, capacitor C18 and resistor R8 are connected between resistor R7 and resistor R9.

[0046] Specifically, pin 3 of transistor Q4 is connected between resistor R7 and the ACC interface, resistors R23 and R24 are connected in parallel, one end is connected to pin 2 of transistor Q4, and the other end is connected to the 48V power supply terminal, the first electrode of resistor R26 is connected to pin 1 of transistor Q4, and the second electrode is connected to the 48V power supply terminal, the first electrode of resistor R17 is connected to pin 1 of transistor Q4, and the second electrode is connected to pin 3 of transistor Q5, pin 2 of transistor Q5 is connected to the first electrode of resistor R21, and the second electrode of resistor R21 is connected to the acc_pwm interface. Pin 2 of transistor Q1 is connected between resistor R7 and pin 3 of transistor Q4, pin 3 of transistor Q1 is connected to a 48V power supply terminal, resistor 11 is connected in parallel with capacitor C23, one end of which is connected to pin 1 of transistor Q1, and the other end is connected to pin 3 of transistor Q1, a first electrode of resistor R10 is connected to pin 1 of transistor Q1, a second electrode of resistor R10 is connected to pin 3 of transistor Q2, pin 2 of transistor Q2 is grounded, pin 1 of transistor Q2 is connected to a first electrode of resistor R15, a second electrode of resistor R15 is provided with an acc_out interface, a first electrode of capacitor C18 and a first electrode of resistor R8 are both connected between resistor R7 and resistor R9, a second electrode of capacitor C18 and a second electrode of resistor R8 are grounded respectively.

[0047] like Figure 4 and Figure 7As shown, the indicator light 22 includes a J10 chip and a J5 chip. Pin 3 of the chip J10 is connected to the 12V power supply terminal of the J5 chip through the 12V power supply terminal. The J10 chip is provided with a ZXSW interface and is connected to the J5 chip through the ZXSW interface. The J5 chip is connected to the J5 chip of the controller 1 through a connecting line.

[0048] like Figure 4 and Figure 8 As shown, the ball switch includes a switch S1, a capacitor C26, and a resistor R32 connected to each other. Both ends of the resistor R32 are connected to the 6th and 10th pins of the MUC chip through the sensor_in interface and the 3.3V power supply terminal respectively.

[0049] like Figure 4 and Fig. 9 As shown, the wheel module circuit 24 includes a connected resistor R41, a transistor Q11, a resistor R43, a diode TVS2, a capacitor C27, a resistor R45, and a resistor R44, wherein one end of the resistor R41 is provided with a 3.3V power supply terminal, the 3-pin of the transistor Q11 is provided with an ABC interface, and the resistor R44 is provided with an ACB_IN interface, which is connected to the 10th and 1st of the MCU chip through the 3.3V power supply terminal and the ABC interface respectively, and is connected to the wheel motor through the ACB_IN interface.

[0050] like Figure 4 and Fig.10 As shown, the solenoid valve circuit 25 includes an H-bridge structure formed by connecting transistors Q14, Q13, Q17, and Q15, an S2 chip, and a U9 chip. The H-bridge structure is provided with interfaces speak1, speak2, siren1, and siren2. The H-bridge structure is connected to the S2 chip through the speak1 and speak2 interfaces. The U9 chip is provided with ZTS_OUT1 and ZTS_OUT2 interfaces. The H-bridge structure is connected to pins 42 and 43 of the MCU chip through the siren1 and siren2 interfaces respectively. The U9 chip is connected to pins 23 and 24 of the MUC chip through the ZTS_OUT1 and ZTS_OUT2 interfaces. The S2 chip can be connected to the J5 chip through a connecting line.

[0051] like Figure 4 and Fig.11As shown, the IO circuit 26 includes a resistor R5 and a diode D6 connected in series, one end of the resistor R5 is provided with a LB_in interface, and one end of the diode D6 is provided with a LB interface, and also includes a resistor R37 and a diode D7 connected in series, one end of the resistor R37 is provided with a LD_in interface, one end of the diode D7 is provided with an LD interface, a resistor R40 and a diode D8 connected in series, one end of the resistor R40 is provided with a DD_in interface, and one end of the diode D8 is provided with a DD interface, a resistor R42 and a diode D9 connected in series, one end of the resistor R42 is provided with an RD_in interface, and one end of the diode D9 is provided with an RD interface. The IO circuit 26 is connected to pins 3, 4, 5, and 32 of the MCU chip through the interfaces DD_in interface, RD_in interface, LD_in interface, and LB_in interface, respectively.

[0052] like Figure 4 and Fig.12 As shown, the electric door lock detection circuit 27 includes a connected resistor R4, a resistor R39, a capacitor C56, a transistor Q10, and a resistor R36. One end of the resistor R36 and one end of the resistor R39 are both provided with a POWER_key interface. The electric door lock detection circuit 27 is connected to pin 46 of the MCU chip through the POWER_key interface.

[0053] like Figure 4 and Fig.13 As shown, the lock motor circuit 28 includes a resistor R56, a resistor R59, a transistor Q18, and a resistor R60. A DIS_out interface is provided at one end of the resistor R60, and a DIS interface is provided at one end of the resistor R59. The lock motor circuit 28 is connected to the 8-pin of the MCU chip through the DIS_out interface, and the lock motor circuit 28 is connected to the lock motor through the DIS interface.

[0054] like Fig.15 As shown, the control electrode and display module also includes a J2 chip and a J3 chip, and the J2 chip and the J3 chip are connected to the internal circuit of the instrument panel 2 through the MCU chip.

[0055] In some embodiments, Figure 4 and Fig.14 As shown, the control and display module further includes a communication module 4 circuit connected to the controller 1 , and the communication module 4 circuit is electrically connected to the internal circuit of the fuse box 3 .

[0056] The communication module 4 circuit includes a diode D10, a diode D12, a resistor R53, and a capacitor C44. The first electrode of the diode D10 is connected to the 22nd pin of the MCU chip through the CTRL_485 interface and the YXT interface, and the second electrode of the diode D10 is connected to the internal circuit of the fuse box 3 through YXT.

[0057] The capacitor C44 and the diode D12 are connected in parallel between the diode D10 and the CTRL_485 interface, the resistor R53 and the diode D12 are connected in series, and one end of the resistor R53 is connected to a 3.3V power supply.

[0058] Specifically, the communication module 4 circuit is used to communicate with the fuse box 3 and the instrument panel 2 , monitor the status of the fuse box 3 and feed back a signal to the controller 1 , and send a control signal to the instrument panel 2 to control the status of the indicator light 22 .

[0059] In some embodiments, Figure 2 and Figure 4 As shown, the internal circuit of the fuse box 3 includes a U1 chip and a U12 chip, the U1 chip is connected to the power supply end of the U12 chip, the 8th pin of the U12 chip is connected to a resistor R125 and a diode D43 connected in series through a YXT OUT interface, and one electrode of the D43 is connected to the second electrode of the diode D10 of the communication module 4 through an interface YXT interface;

[0060] Among them, a capacitor C39 is connected between the diode D43 and the resistor R125, the other end of the capacitor C39 is grounded, and a resistor R126 is connected between the resistor R125 and the interface YXT OUT interface; the Vin interface of the chip U1 chip is connected to a capacitor C21, a diode D2 and a diode D1, the diode D1 is connected in series with the Vin interface, the capacitor C21 and the diode D2 are connected between the diode D1 and the Vin interface, and the other ends of the capacitor C21 and the diode D2 are grounded respectively; the Vout interface of the U1 chip is connected to a capacitor C5 and a capacitor C6, one end of the capacitor C5 and the capacitor C6 are both connected to Vout, and the other ends are both grounded.

[0061] Specifically, the internal circuit of the fuse box 3 is used to protect the electric vehicle system.

[0062] In some embodiments, Figure 3 and Figure 4 As shown, the signal generator 31 includes a controller 1 chip, a resistor R26, a resistor R27, and a capacitor C29. The first electrodes of the resistors R26 and R27 are connected to each other and to the controller 1 chip. The second electrode of the resistor R26 is connected to a 5V power supply. The second electrode of the resistor R27 is connected to the first electrode of the capacitor C29. An output terminal for outputting a square wave signal is provided between the second electrode of the resistor R27 and the first electrode of the capacitor C29. The second electrode of the capacitor C29 is grounded.

[0063] The specific process of this utility model is as follows:

[0064] The signal generator circuit board is integrated in the fuse box. The signal generator is powered by the controller. When the controller is powered on, the signal generator outputs a square wave signal. When the controller detects the square wave signal output by the signal generator, it enters the normal working mode; when the controller does not detect the square wave signal output by the signal generator, the controller does not work.

[0065] Indicator lights (such as fuse indicator lights / symbols) are added to the instrument, and the communication protocol adds a data bit for monitoring the fuse status. When the controller enters the normal working mode, it will send a "fuse connected" signal to the instrument through the communication protocol; when the instrument receives the "fuse connected" signal from the controller through the communication protocol, the instrument fuse indicator light / symbol lights up. When the controller is not working, it will send a "fuse not connected" signal to the instrument through the communication protocol; when the instrument receives the "fuse not connected" signal from the controller through the communication protocol, the instrument fuse indicator light / symbol goes out.

[0066] It should be noted that the above describes some embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the above embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0067] The embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of the present application.

Claims

1. An electric vehicle system, characterized in that: include: A control and display module, comprising an instrument panel (2), a controller (1) and a power supply module (5) connected to each other, wherein the instrument panel (2) is provided with an indicator light (22), and the indicator light (22) is connected to the controller (1); A fuse box (3) module comprises a fuse box (3) and a signal generator (31) arranged in the fuse box (3), wherein the signal generator (31) is electrically connected to the controller (1) and a power supply module (5) respectively, and the controller (1) receives a square wave signal from the signal generator (31) to enter a working state, thereby controlling the indicator light (22) to light up.

2. An electric vehicle system according to claim 1, characterized in that: The instrument panel (2) comprises a main switch circuit (21) connected to the controller (1), an indicator light (22), a ball switch circuit (23), a wheel module circuit (24), a solenoid valve circuit (25), an IO circuit (26), and an electric door lock detection circuit (27).

3. An electric vehicle system according to claim 2, characterized in that: The control and display module further comprises a communication module (4) circuit connected to the controller (1), and the communication module (4) circuit is electrically connected to the internal circuit of the fuse box (3).

4. An electric vehicle system according to claim 3, characterized in that: The controller (1) comprises an MCU chip, a U5 chip and a J12 chip which are connected to each other, and the J12 chip is connected to the MCU chip via a SWCLK interface and a SWDIO interface.

5. An electric vehicle system according to claim 4, characterized in that: The power supply module (5) comprises a U2 chip and a voltage conversion chip U1, wherein the 5th and 6th pins of the U2 chip are connected to the battery via an interface BAT+, the U2 chip is connected to the 3rd pin of the U1 chip via a 5V power supply terminal, and the 2nd pin of the U1 chip outputs a 3.3V power supply and is connected to the MCU chip.

6. An electric vehicle system according to claim 4, characterized in that: The communication module (4) circuit comprises a diode D10, a diode D12, a resistor R53, and a capacitor C44; a first electrode of the diode D10 is connected to the 22nd pin of the MCU chip via a CTRL_485 interface and a YXT interface; and a second electrode of the diode D10 is connected to the internal circuit of the fuse box (3) via YXT.

7. An electric vehicle system according to claim 3, characterized in that: The internal circuit of the fuse box (3) comprises a U1 chip and a U12 chip, wherein the U1 chip is connected to a power supply terminal of the U12 chip, the 8th pin of the U12 chip is connected to a resistor R125 and a diode D43 connected in series via a YXT OUT interface, and one electrode of the D43 is connected to a second electrode of the diode D10 of the communication module (4) via an interface YXT interface.

8. An electric vehicle system according to claim 4, characterized in that: The signal generator (31) comprises a controller (1) chip, a resistor R26, a resistor R27, and a capacitor C29, wherein the first electrodes of the resistors R26 and R27 are connected to each other and to the controller (1) chip, the second electrode of the resistor R26 is connected to a 5V power supply, the second electrode of the resistor R27 is connected to the first electrode of the capacitor C29, an output terminal for outputting a square wave signal is provided between the second electrode of the resistor R27 and the first electrode of the capacitor C29, and the second electrode of the capacitor C29 is grounded.

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