Highly integrated on-board driver wall washer

Abstract

The present invention provides a highly integrated on-board driven wall washer, comprising a control module, a DC-DC constant current drive module, an LED light source module, and a heat dissipation lamp body; the LED light source module comprises an LED substrate and an LED light string; the LED substrate is mounted on the front of the heat dissipation lamp body; the control module comprises a first double-sided board, and the components of the control module are mounted on the front of the first double-sided board; the DC-DC constant current drive module comprises a second double-sided board, and the components of the DC-DC constant current drive module are mounted on the front of the second double-sided board; a threading hole is provided on the heat dissipation lamp body; a connection hole is provided on the LED substrate corresponding to the threading hole; the first double-sided board of the control module, the second double-sided board of the DC-DC constant current drive module, and the LED light string of the LED light source module are mounted on the front of the LED substrate; the middle area of ​​the back of the first double-sided board is opposite to the connection hole on the LED substrate; the pad in the middle area of ​​the back of the first double-sided board is connected to the wiring harness. The present invention has a compact structure, high integration, and is convenient for cascading.

Description

Technical Field

[0001] The invention relates to a lamp, in particular to a highly integrated on-board driven wall washer lamp. Background Art

[0002] At present, the DMX512 wall washer solution in the LED lighting industry mainly adopts the method of separating the DMX512 control module from the LED light source. The conventional practice is basically the back drive module solution. This solution is inconvenient to inspect and the production process is complicated. In addition, this solution needs to increase the flow line when meeting the requirements of multiple lamps hand in hand in series, resulting in high lamp cost and low production efficiency. Under the premise of reducing costs and improving production efficiency, the solution of integrating the DMX512 control module with the LED light source is a development trend. Because the DMX512 control module and DC-DC constant current drive module have many components and the wiring is complicated, a FR4 double-layer board is required. The power of the wall washer is relatively high, and its LED light source part mainly uses a single-sided aluminum substrate. The difficulty lies in how to integrate the three parts together. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a highly integrated on-board driven wall washer lamp, which can highly integrate the control module, DC-DC constant current drive module and LED light source module of the wall washer lamp. The technical solution adopted by the present invention is:

[0004] A highly integrated on-board driven wall washer lamp, comprising a control module, a DC-DC constant current drive module, an LED light source module, and a heat dissipation lamp body;

[0005] The LED light source module includes an LED substrate and an LED light string; the LED substrate is installed on the front side of the heat dissipation lamp body;

[0006] The control module comprises a first double-sided board, and components of the control module are mounted on the front side of the first double-sided board;

[0007] The DC-DC constant current driving module comprises a second double-sided board, and components of the DC-DC constant current driving module are mounted on the front side of the second double-sided board;

[0008] The heat dissipation lamp body is provided with a threading hole; the LED substrate is provided with a connection hole corresponding to the threading hole;

[0009] The first double-sided board of the control module, the second double-sided board of the DC-DC constant current driving module and the LED light string of the LED light source module are mounted together on the front side of the LED substrate;

[0010] The middle area of ​​the back of the first double-sided board is opposite to the connection hole on the LED substrate; the pads on both sides of the back of the first double-sided board are connected to the corresponding pads on the LED substrate; the pads in the middle area of ​​the back of the first double-sided board are connected to the wiring harness; the wiring harness passes backward through the connection hole on the LED substrate and the threading hole on the heat dissipation lamp body;

[0011] The soldering pads on the back side of the second double-sided board are connected to the corresponding soldering pads on the LED substrate.

[0012] Further, the pads in the middle area of ​​the back side of the first double-sided board include: a DC voltage input terminal DCin+ pad, a DC voltage input ground terminal DCin- pad, two electrically connected input signal A terminal pads, two electrically connected input signal B terminal pads, an address input terminal ADRI pad, and an address output terminal ADRO pad;

[0013] A first wiring harness with a female connector is connected to one side of a DC voltage input terminal DCin+ pad, one of two electrically connected input signal A terminal pads, one of two electrically connected input signal B terminal pads, an address output terminal ADRO pad, and one side of a DC voltage input ground terminal DCin- pad;

[0014] The other side of the DC voltage input terminal DCin+ pad, the other of the two electrically connected input signal A terminal pads, the other of the two electrically connected input signal B terminal pads, the address input terminal ADRI pad, and the other side of the DC voltage input ground terminal DCin- pad are connected to a second wiring harness with a male connector;

[0015] The first wire harness and the second wire harness pass backward through the connection hole on the LED substrate and the threading hole on the heat dissipation lamp body.

[0016] Furthermore, the pads on both sides of the back side of the first double-sided board include: a PWM signal output terminal PWM-B pad, a PWM signal output terminal PWM-G pad, a PWM signal output terminal PWM-R pad, a PWM signal output terminal PWM-W pad, a ground terminal GND pad, and a DC power supply terminal VCC pad.

[0017] Further, the control module includes a diode D1, an LED drive control chip U1, resistors R4, R5, R6, R7, R8, capacitors C1, C2, a DC voltage input terminal DCin+, a DC power supply terminal VCC, an input signal A terminal, an input signal B terminal, an address input terminal ADRI, an address output terminal ADRO, a ground terminal GND, and four PWM signal output terminals PWM-B, PWM-G, PWM-R, and PWM-W;

[0018] The input signal A terminal and the input signal B terminal are used to connect the input control signal. The four PWM signal output terminals PWM-B, PWM-G, PWM-R, and PWM-W are used to connect the PWM signal input terminals of each DC-DC constant current drive module. The address input terminal ADRI is used to connect the address signal sent by the main controller or the upper-level wall washer. The address output terminal ADRO is used to send the address signal to the lower-level wall washer. The DC voltage input terminal DCin+ is connected to the input DC voltage.

[0019] The DC voltage input terminal DCin is connected to the anode of the diode D1 through the fuse F1, the cathode of the diode D1 is connected to the DC power supply terminal VCC, one end of the capacitor C2 and one end of the resistor R4, the other end of the capacitor C2 is connected to the ground terminal GND, the other end of the resistor R4 is connected to one end of the capacitor C1 and the power supply pin of the LED drive control chip U1, and the other end of the capacitor C1 and the ground pin of U1 are connected to the ground terminal GND; the address input pin of U1 is connected to the address input terminal ADRI through the resistor R5, the address output pin of U1 is connected to the address output terminal ADRO through the resistor R8, the signal A input pin of U1 is connected to the input signal A terminal through the resistor R7, and the signal B input pin of U1 is connected to the input signal B terminal through the resistor R6; the PWM output pins OUTB, OUTG, OUTR, and OUTW of U1 are respectively connected to the four PWM signal output terminals PWM-B, PWM-G, PWM-R, and PWM-W.

[0020] Furthermore, the pads on the back side of the second double-sided board include: a DC power supply end VCC pad, an LED cathode drive end pad, a PWM signal input end pad, and a ground end GND pad.

[0021] Furthermore, the DC-DC constant current drive module includes a DC-DC step-down constant current chip U2, an inductor T1, a Schottky diode D11, resistors R11, R13, R15, R16, capacitors C11, C12, C13, C14, a DC power supply terminal VCC, a PWM signal input terminal, an LED cathode drive terminal, and a ground terminal GND; U2 adopts MBI6662;

[0022] The LX pin of U2 is connected to one end of the inductor T1 and the anode of the Schottky diode D11, and the other end of the inductor T1 is connected to the negative driving end of the LED; the negative driving end of the LED is used to connect to the cathode of the LED light string; the CSN pin of U1 is connected to the cathode of the Schottky diode D11 and one end of the resistor R11; the other end of the resistor R11 is connected to the DC power supply end VCC, the positive electrode of the capacitor C11, one end of the capacitor C12 and the VIN pin of U2, the negative electrode of the capacitor C11 and the other end of C12 are connected to the ground terminal GND, the DIM pin of U2 is connected to the PWM signal input end through the resistor R16, the VCC pin of U2 is connected to the ground terminal GND through the capacitor C13, the ground pin of U2 is connected to the ground terminal GND, the CSP pin of U2 is connected to the ground terminal GND through the resistor R13, the COMP pin of U2 is connected to the ground terminal GND through the capacitor C14, and the FS pin of U2 is connected to the ground terminal GND through the resistor R15.

[0023] The advantages of the present invention are:

[0024] 1) Compact structure and high integration.

[0025] 2) Easy to connect, multiple lamps can be cascaded without adding flow lines.

[0026] 3) The control module, DC-DC constant current drive module, and LED light source can all be mounted on the same PCB board, which optimizes and shortens the coding test process.

[0027] 4) Simple assembly and short production cycle improve production efficiency, reduce costs and enhance product market competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is the principle diagram of the control module of the present invention.

[0029] Figure 2 It is a back view of the PCB board of the control module of the present invention.

[0030] Figure 3 This is a schematic diagram of the DC-DC constant current drive module of the present invention.

[0031] Figure 4 This is a back view of the PCB board of the DC-DC constant current drive module of the present invention.

[0032] Figure 5 It is the installation schematic diagram of the present invention. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with specific drawings and embodiments.

[0034] An embodiment of the present invention provides a highly integrated board-driven wall washer lamp, comprising a control module 1, a DC-DC constant current drive module 2, an LED light source module 3, and a heat dissipation lamp body 4;

[0035] The control module 1 adopts a DMX512 control module; DMX512 is a standard for digital signal control of lighting equipment;

[0036] The LED light source module 3 includes an LED substrate 301 and an LED light string mounted on the LED substrate 301; the LED substrate 301 is embedded in the front of the heat dissipation lamp body 4; the LED substrate 301 can be an aluminum substrate, and its front and back sides are provided with insulating paint (except for the soldering pad position);

[0037] The heat dissipation lamp body 4 is made of aluminum profile;

[0038] A wall washer lamp is about 1 meter long, so the lengths of the LED substrate 301 and the heat dissipation lamp body 4 are both about 1 meter;

[0039] like Figure 1 , Figure 2 As shown, the control module 1 includes a diode D1, an LED drive control chip U1, resistors R4, R5, R6, R7, R8, capacitors C1, C2, a DC voltage input terminal DCin+, a DC power supply terminal VCC, an input signal A terminal, an input signal B terminal, an address input terminal ADRI, an address output terminal ADRO, a ground terminal GND, and four PWM signal output terminals PWM-B, PWM-G, PWM-R, and PWM-W;

[0040] Among them, U1 adopts SM16512, the input signal A terminal and the input signal B terminal are used to receive the input control signal, and the four PWM signal output terminals PWM-B, PWM-G, PWM-R, and PWM-W are used to connect the PWM signal input terminals of each DC-DC constant current driver module 2 (for RGBW four-color wall washer lights, four DC-DC constant current driver modules 2 are required); the address input terminal ADRI is used to receive the address signal sent by the main controller or the upper-level wall washer light, and the address output terminal ADRO is used to send the address signal to the lower-level wall washer light; the DC voltage input terminal DCin+ is connected to the +24v voltage;

[0041] The DC voltage input terminal DCin is connected to the anode of the diode D1 through the fuse F1, the cathode of the diode D1 is connected to the DC power supply terminal VCC, one end of the capacitor C2 and one end of the resistor R4, the other end of the capacitor C2 is connected to the ground terminal GND, the other end of the resistor R4 is connected to one end of the capacitor C1 and the power supply pin of the LED drive control chip U1, and the other end of the capacitor C1 and the ground pin of U1 are connected to the ground terminal GND; the address input pin of U1 is connected to the address input terminal ADRI through the resistor R5, the address output pin of U1 is connected to the address output terminal ADRO through the resistor R8, the signal A input pin of U1 is connected to the input signal A terminal through the resistor R7, and the signal B input pin of U1 is connected to the input signal B terminal through the resistor R6; the PWM output pins OUTB, OUTG, OUTR, and OUTW of U1 are respectively connected to the four PWM signal output terminals PWM-B, PWM-G, PWM-R, and PWM-W;

[0042] The control module 1 includes a first double-sided board 1a, such as Figure 2 As shown, the first double-sided board 1a can be a FR4 double-sided board, the components of the control module 1 are mounted on the front side of the first double-sided board 1a, and the back side of the first double-sided board 1a is provided with:

[0043] PWM signal output terminal PWM-B pad, PWM signal output terminal PWM-G pad, PWM signal output terminal PWM-R pad, PWM signal output terminal PWM-W pad, ground terminal GND pad, DC power supply terminal VCC pad, as well as DC voltage input terminal DCin+ pad, DC voltage input ground terminal DCin- pad, two electrically connected input signal A terminal pads, two electrically connected input signal B terminal pads, address input terminal ADRI pad, address output terminal ADRO pad;

[0044] Among them, the PWM signal output terminal PWM-B pad, the PWM signal output terminal PWM-G pad, the PWM signal output terminal PWM-R pad, the PWM signal output terminal PWM-W pad, the ground terminal GND pad, and the DC power supply terminal VCC pad are distributed on both sides of the back of the first double-sided board 1a, and the DC voltage input terminal DCin+ pad, the DC voltage input ground terminal DCin- pad, two electrically connected input signal A terminal pads, two electrically connected input signal B terminal pads, the address input terminal ADRI pad, and the address output terminal ADRO pad are distributed in the middle area of ​​the back of the first double-sided board 1a;

[0045] like Figure 3 , Figure 4 As shown, the DC-DC constant current drive module 2 includes a DC-DC step-down constant current chip U2, an inductor T1, a Schottky diode D11, resistors R11, R13, R15, R16, capacitors C11, C12, C13, C14, a DC power supply terminal VCC, a PWM signal input terminal, and an LED cathode drive terminal ( Figure 3 LED- in), ground terminal GND; U2 uses MBI6662;

[0046] The LX pin of U2 is connected to one end of the inductor T1 and the anode of the Schottky diode D11, and the other end of the inductor T1 is connected to the negative driving end of the LED; the negative driving end of the LED is used to connect to the cathode of the LED light string; the CSN pin of U1 is connected to the cathode of the Schottky diode D11 and one end of the resistor R11; the other end of the resistor R11 is connected to the DC power supply end VCC, the positive electrode of the capacitor C11, one end of the capacitor C12 and the VIN pin of U2, the negative electrode of the capacitor C11 and the other end of C12 are connected to the ground terminal GND, the DIM pin of U2 is connected to the PWM signal input end through the resistor R16, the VCC pin of U2 is connected to the ground terminal GND through the capacitor C13, the ground pin of U2 is connected to the ground terminal GND, the CSP pin of U2 is connected to the ground terminal GND through the resistor R13, the COMP pin of U2 is connected to the ground terminal GND through the capacitor C14, and the FS pin of U2 is connected to the ground terminal GND through the resistor R15;

[0047] Among them, the inductor T1 is used as an energy storage inductor, the Schottky diode D11 plays a freewheeling role, and the capacitor C14 controls the feedback compensation bandwidth;

[0048] The DC-DC constant current driving module 2 includes a second double-sided board 2a, such as Figure 4 As shown, the second double-sided board 2a can be a FR4 double-sided board, the components of the DC-DC constant current drive module 2 are mounted on the front side of the second double-sided board 2a, and the back side of the second double-sided board 2a is provided with:

[0049] The DC power supply end VCC pad, the LED cathode drive end pad, the PWM signal input end pad, and the ground end GND pad; the positions of these pads are not limited. In this embodiment, the DC power supply end VCC pad and the LED cathode drive end pad are distributed on the left side of the back of the second double-sided board 2a, and the PWM signal input end pad and the ground end GND pad are distributed on the right side of the back of the second double-sided board 2a;

[0050] like Figure 5 As shown, the heat dissipation lamp body 4 is provided with a threading hole 401; and the LED substrate 301 is provided with a connection hole 302 corresponding to the threading hole 401;

[0051] The first double-sided board 1a of the control module 1, the second double-sided board 2a of the DC-DC constant current driving module 2 and the LED light string of the LED light source module 3 are mounted together on the front side of the LED substrate 301;

[0052] For ease of understanding, Figure 5 In the sequence from bottom to top, the bottom wall of the heat dissipation lamp body 4, the LED substrate 301, the first double-sided board 1a mounted on the LED substrate 301, the second double-sided board 2a and the LED light string; Figure 5 The second double-sided board 2a and the LED light string are not shown in the figure, so it is hereby explained;

[0053] The middle area of ​​the back side of the first double-sided board 1a is opposite to the connection hole 302 on the LED substrate 301; and the connection hole 302 is connected to the threading hole 401 on the heat dissipation lamp body 4, so after the wiring harness is connected to the pads in the middle area of ​​the back side of the first double-sided board 1a of the control module 1, the wiring harness can be connected to the upper or lower level wall washer on the back side of the heat dissipation lamp body 4 through the connection hole 302 and the threading hole 401;

[0054] The PWM signal output terminal PWM-B pad, PWM signal output terminal PWM-G pad, PWM signal output terminal PWM-R pad, PWM signal output terminal PWM-W pad, ground terminal GND pad, and DC power supply terminal VCC pad on both sides of the back of the first double-sided board 1a are connected to the corresponding pads on the LED substrate 301;

[0055] In the middle area on the back of the first double-sided board 1a, one side of the DC voltage input terminal DCin+ pad, one of the two electrically connected input signal A-end pads, one of the two electrically connected input signal B-end pads, the address output terminal ADRO pad, and one side of the DC voltage input ground terminal DCin- pad are connected to the first wiring harness with a female connector; the other side of the DC voltage input terminal DCin+ pad, the other of the two electrically connected input signal A-end pads, the other of the two electrically connected input signal B-end pads, the address input terminal ADRI pad, and the other side of the DC voltage input ground terminal DCin- pad are connected to the second wiring harness with a male connector; the first wiring harness and the second wiring harness pass backwards through the connection hole 302 on the LED substrate 301 and the threading hole 401 on the heat dissipation lamp body 4, and are used for cascading wall washers;

[0056] The DC power supply terminal VCC pad, LED cathode driving terminal pad, PWM signal input terminal pad, and ground terminal GND pad on the back of the second double-sided board 2 a are connected to corresponding pads on the LED substrate 301 .

[0057] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A highly integrated on-board driven wall washer lamp, characterized in that: It comprises a control module (1), a DC-DC constant current drive module (2), an LED light source module (3), and a heat dissipation lamp body (4); The LED light source module (3) comprises an LED substrate (301) and an LED light string; the LED substrate (301) is mounted on the front side of the heat dissipation lamp body (4); The control module (1) comprises a first double-sided board (1a), and components of the control module (1) are mounted on the front side of the first double-sided board (1a); The DC-DC constant current driving module (2) comprises a second double-sided board (2a), and components of the DC-DC constant current driving module (2) are mounted on the front side of the second double-sided board (2a); A threading hole (401) is provided on the heat dissipation lamp body (4); a connection hole (302) is provided on the LED substrate (301) corresponding to the threading hole (401); The first double-sided board (1a) of the control module (1), the second double-sided board (2a) of the DC-DC constant current drive module (2) and the LED light string of the LED light source module (3) are mounted together on the front side of the LED substrate (301); The middle area of ​​the back side of the first double-sided board (1a) is opposite to the connection hole (302) on the LED substrate (301); the soldering pads on both sides of the back side of the first double-sided board (1a) are connected to the corresponding soldering pads on the LED substrate (301); the soldering pads in the middle area of ​​the back side of the first double-sided board (1a) are connected to the wiring harness; the wiring harness passes backwards through the connection hole (302) on the LED substrate (301) and the threading hole (401) on the heat dissipation lamp body (4); The soldering pads on the back of the second double-sided board (2a) are connected correspondingly to the corresponding soldering pads on the LED substrate (301); The pads in the middle area of ​​the back side of the first double-sided board (1a) include: a DC voltage input terminal DCin+ pad, a DC voltage input ground terminal DCin- pad, two electrically connected input signal A terminal pads, two electrically connected input signal B terminal pads, an address input terminal ADRI pad, and an address output terminal ADRO pad; A first wiring harness with a female connector is connected to one side of a DC voltage input terminal DCin+ pad, one of two electrically connected input signal A terminal pads, one of two electrically connected input signal B terminal pads, an address output terminal ADRO pad, and one side of a DC voltage input ground terminal DCin- pad; The other side of the DC voltage input terminal DCin+ pad, the other of the two electrically connected input signal A terminal pads, the other of the two electrically connected input signal B terminal pads, the address input terminal ADRI pad, and the other side of the DC voltage input ground terminal DCin- pad are connected to a second wiring harness with a male connector; The first wire harness and the second wire harness pass backwards through the connection hole (302) on the LED substrate (301) and the threading hole (401) on the heat dissipation lamp body (4); The LED substrate 301 may be an aluminum substrate, and the heat dissipation lamp body 4 may be an aluminum profile.

2. The highly integrated on-board driven wall washer lamp according to claim 1, characterized in that: The pads on both sides of the back side of the first double-sided board (1a) include: a PWM signal output terminal PWM-B pad, a PWM signal output terminal PWM-G pad, a PWM signal output terminal PWM-R pad, a PWM signal output terminal PWM-W pad, a ground terminal GND pad, and a DC power supply terminal VCC pad.

3. The highly integrated on-board driven wall washer lamp as claimed in claim 2, characterized in that: The control module (1) comprises a diode D1, an LED drive control chip U1, resistors R4, R5, R6, R7, R8, capacitors C1, C2, a DC voltage input terminal DCin+, a DC power supply terminal VCC, an input signal A terminal, an input signal B terminal, an address input terminal ADRI, an address output terminal ADRO, a ground terminal GND, and four PWM signal output terminals PWM-B, PWM-G, PWM-R, and PWM-W; The input signal A terminal and the input signal B terminal are used to receive input control signals; the four PWM signal output terminals PWM-B, PWM-G, PWM-R, and PWM-W are used to receive PWM signal input terminals of each DC-DC constant current drive module (2); the address input terminal ADRI is used to receive an address signal sent by a main controller or an upper-level wall washer lamp; the address output terminal ADRO is used to send an address signal to a lower-level wall washer lamp; the DC voltage input terminal DCin+ is used to receive an input DC voltage; The DC voltage input terminal DCin is connected to the anode of the diode D1 through the fuse F1, the cathode of the diode D1 is connected to the DC power supply terminal VCC, one end of the capacitor C2 and one end of the resistor R4, the other end of the capacitor C2 is connected to the ground terminal GND, the other end of the resistor R4 is connected to one end of the capacitor C1 and the power supply pin of the LED drive control chip U1, and the other end of the capacitor C1 and the ground pin of U1 are connected to the ground terminal GND; the address input pin of U1 is connected to the address input terminal ADRI through the resistor R5, the address output pin of U1 is connected to the address output terminal ADRO through the resistor R8, the signal A input pin of U1 is connected to the input signal A terminal through the resistor R7, and the signal B input pin of U1 is connected to the input signal B terminal through the resistor R6; the PWM output pins OUTB, OUTG, OUTR, and OUTW of U1 are respectively connected to the four PWM signal output terminals PWM-B, PWM-G, PWM-R, and PWM-W.

4. The highly integrated on-board driven wall washer lamp according to any one of claims 1 to 3, characterized in that: The pads on the back of the second double-sided board (2a) include: a DC power supply end VCC pad, an LED cathode drive end pad, a PWM signal input end pad, and a ground end GND pad.

5. The highly integrated on-board driven wall washer lamp as claimed in claim 4, characterized in that: The DC-DC constant current driving module (2) comprises a DC-DC step-down constant current chip U2, an inductor T1, a Schottky diode D11, resistors R11, R13, R15, R16, capacitors C11, C12, C13, C14, a DC power supply terminal VCC, a PWM signal input terminal, an LED cathode driving terminal, and a ground terminal GND; U2 adopts MBI6662; The LX pin of U2 is connected to one end of the inductor T1 and the anode of the Schottky diode D11, and the other end of the inductor T1 is connected to the negative driving end of the LED; the negative driving end of the LED is used to connect to the cathode of the LED light string; the CSN pin of U1 is connected to the cathode of the Schottky diode D11 and one end of the resistor R11; the other end of the resistor R11 is connected to the DC power supply end VCC, the positive electrode of the capacitor C11, one end of the capacitor C12 and the VIN pin of U2, the negative electrode of the capacitor C11 and the other end of C12 are connected to the ground terminal GND, the DIM pin of U2 is connected to the PWM signal input end through the resistor R16, the VCC pin of U2 is connected to the ground terminal GND through the capacitor C13, the ground pin of U2 is connected to the ground terminal GND, the CSP pin of U2 is connected to the ground terminal GND through the resistor R13, the COMP pin of U2 is connected to the ground terminal GND through the capacitor C14, and the FS pin of U2 is connected to the ground terminal GND through the resistor R15.

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