Handset anti-twist light circuit

Abstract

The utility model relates to electrical automatic control technical field, concretely, handheld machine prevents anti -twist flashlight circuit, including first power module, main control module, relay module, detection module and second power module, first power module connects main control module and relay module. In the utility model, when the drill bit is stuck or is blocked in the working process of the drilling machine, the detection module arranged on the machine detects the anti -twist of the machine, and after satisfying the condition that the machine is reversed 45 degrees within 0.2 seconds, the main control module disconnects the motor power supply for the first time through the relay module, thereby reaching the effect of instantaneous automatic shutdown, the signal action response is fast, can prevent the operator sprains wrist, protects the personal safety of operator.

Description

Technical Field

[0001] This utility model relates to the field of electrical automatic control technology, and more specifically, to a handheld device anti-reverse twisting circuit. Background Technology

[0002] A handheld drilling machine is a common tool, typically consisting of an electric motor and a drill bit. Its main function is to drill holes in hard materials such as walls, ceilings, and floors. The handheld drilling machine uses a high-speed rotating drill bit to remove material, thus achieving the purpose of drilling.

[0003] During operation, the operator holds the drilling machine and aligns the drill bit with the drilling site. If, during drilling, the drill bit becomes stuck due to the formation of large particles or other large objects that cannot be expelled in time, the drill may become jammed. Even when the drill bit is stuck and unable to rotate, the power supply to the drilling machine remains on, causing the motor to continue running. In this situation, the motor will cause the drilling machine to twist in the opposite direction. This twisting of the drilling machine will cause the operator's hand holding the machine to rotate, potentially causing a wrist injury. If the drilling machine is released from the operator's hands, it will endanger the operator's personal safety and pose a danger.

[0004] To prevent operators from twisting their wrists due to reverse rotation of the drilling machine, a handheld device anti-reverse twisting circuit is proposed. Summary of the Invention

[0005] The purpose of this invention is to provide a handheld device anti-reverse twisting circuit to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides a handheld device anti-reverse twisting circuit, including a first power module, a main control module, a relay module, a detection module, and a second power module. The first power module is connected to the main control module and the relay module, and the relay module is connected to the second power module. The second power module is used to supply power to the motor of the drilling machine. The detection module is installed on the drilling machine and is connected to the main control module. The main control module is connected to the relay module.

[0007] The main control module detects the torsional state of the drilling machine through the detection module. When the drilling machine twists in the opposite direction, the main control module controls the relay module to disconnect the connection circuit between the first power module and the second power module, so that the second power module loses power and controls the motor to stop working.

[0008] As a further improvement to this technical solution, the detection module includes a gyroscope circuit and a conversion circuit connected to the gyroscope circuit. The gyroscope circuit is installed on the drilling machine to detect the torsion of the drilling machine. The conversion circuit is connected to the main control module to convert the analog signal output by the gyroscope circuit into a digital signal.

[0009] As a further improvement to this technical solution, the gyroscope circuit includes a chip U1 mounted on the drilling machine.

[0010] The CLKIN pin of chip U1 is connected to capacitor C11 and grounded, and the VLOGIC pin of chip U1 is connected to the other end of capacitor C11 and connected to VCC 3.3V.

[0011] The REGOUT pin of chip U1 is connected to capacitor C13, and the FSYNC pin of chip U1 is connected to the other end of capacitor C13 and grounded.

[0012] The VDD pin of the chip U1 is connected to capacitor C102 and then to the VCC 3.3V terminal, and capacitor C102 is grounded;

[0013] The GND pin of chip U1 is connected to capacitor C14 and grounded, and the CPOUT pin of chip U1 is connected to the other end of capacitor C14;

[0014] The SCL pin of chip U1 is connected to resistor R35, resistor R35 is connected to resistor R34 and connected to VCC 3.3V terminal, and the SDA pin of chip U1 is connected to the other end of resistor R34.

[0015] As a further improvement to this technical solution, the relay module includes chips IC1, IC2, and IC3, and transistors IG1, IG2, IG3, IG4, IG5, and IG6, wherein...

[0016] The VCC pin of the chip IC1 is connected in parallel with capacitor C1, E1, and resistor R1 to +15V. Capacitor C1 is connected to the other end of capacitor E1 and grounded. Resistor R1 is connected to the positive terminal of diode D1.

[0017] The HIN pin of the chip IC1 is connected to resistor R10 and resistor R16, and resistor R10 is connected to the PWM1 terminal;

[0018] The LIN pin of the chip IC1 is connected to resistor R11 and resistor R17, and resistor R11 is connected to the PWM2 terminal;

[0019] The COM pin of the chip IC1 is connected to the other end of resistor R16, the other end of resistor R17, and grounded;

[0020] The VB pin of the chip IC1 is connected to the negative terminal of the diode D1 and to capacitors C2 and E2.

[0021] The HO pin of the chip IC1 is connected to resistor R4, and resistor R4 is connected to resistor R25 and then to the gate of the transistor IG1.

[0022] The VS pin of the chip IC1 is connected to the other end of the capacitor C2, the other end of the capacitor E2 is connected in parallel to the resistor R22, the resistor R22 is connected to the other end of the resistor R25, and the transistors IG1 and IG2 are connected in parallel to the coil U;

[0023] The LO pin of the chip IC1 is connected to resistor R5. Resistor R5 is connected to the gate of transistor IG2 and connected to resistor R26. Transistor IG2 is connected to resistors R28, R30, and R31. Transistors IG4 and IG6 are connected to the other end of resistor R26. Resistor R31 is grounded.

[0024] The VCC pin of the chip IC2 has capacitor C3 and resistor R2 connected in parallel to +15V, capacitor C3 grounded, and resistor R2 connected to the positive terminal of diode D2;

[0025] The HIN pin of the chip IC2 is connected to resistor R12 and resistor R18, and resistor R12 is connected to the PWM3 terminal;

[0026] The LIN pin of the chip IC2 is connected to resistor R13 and resistor R19 in parallel. Resistor R13 is connected to the PWM4 terminal.

[0027] The COM pin of the chip IC2 is connected to the other end of resistor R18, the other end of resistor R19, and grounded;

[0028] The VB pin of the chip IC2 is connected to the negative terminal of the diode D2 and to capacitors C3 and E3.

[0029] The HO pin of the chip IC2 is connected to resistor R6, and resistor R6 is connected to resistor R27 and then to the gate of the transistor IG3.

[0030] The VS pin of the chip IC2 is connected to the other end of the capacitor C3, the other end of the capacitor E3 is connected in parallel to the resistor R23, the resistor R23 is connected to the other end of the resistor R27, and the transistors IG3 and IG4 are connected in parallel to the coil V;

[0031] The LO pin of the chip IC2 is connected to resistor R7, which is connected to the gate of the transistor IG4 and to the other end of resistor R28.

[0032] The VCC pin of the chip IC3 has capacitor C5 and resistor R3 connected in parallel to +15V, capacitor C5 grounded, and resistor R3 connected to the positive terminal of diode D3;

[0033] The HIN pin of the chip IC3 is connected to resistor R14 and resistor R20, and resistor R14 is connected to the PWM5 terminal.

[0034] The LIN pin of the chip IC3 is connected to resistor R15 and resistor R21, and resistor R15 is connected to the PWM6 terminal.

[0035] The COM pin of the chip IC3 is connected to the other end of resistor R20 and the other end of resistor R21 and grounded;

[0036] The VB pin of the chip IC3 is connected to the negative terminal of the diode D3 and connected to capacitors C4 and E4;

[0037] The HO pin of the chip IC3 is connected to resistor R8, and resistor R8 is connected to resistor R29 and then to the gate of the transistor IG5.

[0038] The VS pin of the chip IC3 is connected to the other end of the capacitor C4, the other end of the capacitor E4 is connected in parallel to the resistor R24, the resistor R24 ​​is connected to the other end of the resistor R29, and the transistors IG5 and IG6 are connected in parallel to the coil W;

[0039] The LO pin of the chip IC3 is connected to resistor R9, which is connected to the gate of the transistor IG6 and the other end of resistor R30.

[0040] As a further improvement to this technical solution, the chips IC1, IC2, and IC3 are all IR2103 type driver chips.

[0041] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0042] In the anti-reverse twisting circuit of this handheld device, when the drill bit gets stuck or stalls during the operation of the drilling machine, the detection module set on the machine detects the reverse twisting of the machine. After the condition that the machine reverses 45 degrees within 0.2 seconds is met, the main control module disconnects the motor power supply through the relay module, thereby achieving the effect of instantaneous automatic stop. The signal action response is fast, which can prevent the operator from twisting their wrist and protect the operator's personal safety. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0044] Figure 2 This is the circuit diagram of the gyroscope of this utility model;

[0045] Figure 3 This is the circuit diagram of the relay module of this utility model. Detailed Implementation

[0046] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0048] When a drilling machine is in use, if the drill bit gets stuck or stalls, the motor will continue to run because the power supply remains on. If the drill bit gets stuck and cannot rotate, the motor will cause the drilling machine body to twist in the opposite direction. When the drilling machine body twists, it will cause the operator's hand holding the drilling machine to rotate, which can twist the operator's wrist. If the drilling machine is released from the operator's hand, it will affect the operator's personal safety and poses a danger.

[0049] Therefore, please refer to Figures 1-3 As shown, this embodiment provides a handheld device anti-reverse twisting circuit, including a first power module, a main control module, a relay module, a detection module, and a second power module. The first power module is connected to the main control module and the relay module, the relay module is connected to the second power module, the second power module is used to supply power to the motor of the drilling machine, the detection module is set on the drilling machine, the detection module is connected to the main control module, and the main control module is connected to the relay module.

[0050] The main control module detects the torsional state of the drilling machine through the detection module. When the drilling machine twists in the opposite direction, the main control module controls the relay module to disconnect the connection circuit between the first power module and the second power module, so that the second power module loses power and controls the motor to stop working.

[0051] The detection module includes a gyroscope circuit and a conversion circuit connected to the gyroscope circuit. The gyroscope circuit is installed on the drilling machine to detect the torsion of the drilling machine. The conversion circuit is connected to the main control module to convert the analog signal output by the gyroscope circuit into a digital signal.

[0052] The gyroscope circuit includes a chip U1 mounted on the drilling machine.

[0053] The CLKIN pin of chip U1 is connected to capacitor C11 and grounded, and the VLOGIC pin of chip U1 is connected to the other end of capacitor C11 and then to VCC 3.3V.

[0054] The REGOUT pin of chip U1 is connected to capacitor C13, and the FSYNC pin of chip U1 is connected to the other end of capacitor C13 and grounded.

[0055] The VDD pin of chip U1 is connected to capacitor C102 and then to the VCC 3.3V terminal. Capacitor C102 is grounded.

[0056] The GND pin of chip U1 is connected to capacitor C14 and grounded, and the CPOUT pin of chip U1 is connected to the other end of capacitor C14.

[0057] The SCL pin of chip U1 is connected to resistor R35, resistor R35 is connected to resistor R34 and connected to the VCC 3.3V terminal, and the SDA pin of chip U1 is connected to the other end of resistor R34.

[0058] Chip U1 is an MPU-6050 gyroscope chip. It utilizes the characteristic that the rotation axis of a rotating object will not change direction when it is not affected by external forces. It generates an analog signal of the object's motion by reading the direction indicated by the axis. That is, the analog signal of the drilling machine is converted into a digital signal by the conversion circuit. The main control module receives the signal and determines whether the drilling machine has reversed its rotation. When the drilling machine is detected to rotate 45 degrees within 0.2 seconds, the main control module controls the relay module to interrupt the connection circuit between the first power module and the second power module, thereby cutting off the power supply to the motor and stopping the motor.

[0059] The relay module includes chips IC1, IC2, and IC3, and transistors IG1, IG2, IG3, IG4, IG5, and IG6.

[0060] The VCC pin of chip IC1 is connected to +15V via capacitors C1 and E1 and resistor R1. Capacitor C1 is connected to the other end of capacitor E1 and grounded. Resistor R1 is connected to the positive terminal of diode D1.

[0061] Connect resistor R10 to the HIN pin of chip IC1 and connect resistor R16 in parallel. Connect resistor R10 to the PWM1 terminal.

[0062] Connect the LIN pin of chip IC1 to resistor R11 and then to resistor R17. Connect resistor R11 to the PWM2 terminal.

[0063] The COM pin of chip IC1 is connected to the other end of resistor R16, the other end of resistor R17, and grounded.

[0064] Connect the VB pin of chip IC1 to the negative terminal of diode D1 and connect it in parallel with capacitors C2 and E2;

[0065] The HO pin of chip IC1 is connected to resistor R4, and resistor R4 is connected to resistor R25 and then to the gate of transistor IG1.

[0066] The VS pin of chip IC1 is connected to the other end of capacitor C2, the other end of capacitor E2 is connected in parallel to resistor R22, resistor R22 is connected to the other end of resistor R25, and transistors IG1 and IG2 are connected in parallel to coil U;

[0067] The LO pin of chip IC1 is connected to resistor R5. Resistor R5 is connected to the gate of transistor IG2 and then connected to resistor R26. Transistor IG2 is connected to resistors R28, R30, and R31. Transistors IG4 and IG6 are connected to the other end of resistor R26. Resistor R31 is grounded.

[0068] The VCC pin of chip IC2 is connected in parallel with capacitor C3 and resistor R2 to +15V. Capacitor C3 is grounded and resistor R2 is connected to the positive terminal of diode D2.

[0069] Connect resistor R12 to the HIN pin of chip IC2 and then connect resistor R18 in parallel. Connect resistor R12 to the PWM3 terminal.

[0070] Connect the LIN pin of chip IC2 to resistor R13 and then to resistor R19. Connect resistor R13 to PWM4 terminal.

[0071] Connect the COM pin of chip IC2 to the other end of resistor R18, the other end of resistor R19, and ground;

[0072] Connect the VB pin of chip IC2 to the negative terminal of diode D2 and connect it to capacitors C3 and E3.

[0073] The HO pin of chip IC2 is connected to resistor R6, which is then connected to resistor R27 and in turn to the gate of transistor IG3.

[0074] The VS pin of chip IC2 is connected to the other end of capacitor C3, the other end of capacitor E3 is connected in parallel to resistor R23, resistor R23 is connected to the other end of resistor R27, and transistors IG3 and IG4 are connected in parallel to coil V;

[0075] The LO pin of chip IC2 is connected to resistor R7, which is connected to the gate of transistor IG4 and then to the other end of resistor R28.

[0076] The VCC pin of chip IC3 is connected in parallel with capacitor C5 and resistor R3 to +15V. Capacitor C5 is grounded and resistor R3 is connected to the positive terminal of diode D3.

[0077] Connect resistor R14 to the HIN pin of chip IC3 and connect resistor R20 in parallel. Connect resistor R14 to the PWM5 terminal.

[0078] Connect resistor R15 and resistor R21 to the LIN pin of chip IC3. Connect resistor R15 to PWM6.

[0079] Connect the COM pin of chip IC3 to the other end of resistor R20, the other end of resistor R21, and ground;

[0080] Connect the VB pin of chip IC3 to the negative terminal of diode D3 and connect it in parallel with capacitors C4 and E4;

[0081] The HO pin of chip IC3 is connected to resistor R8, which is then connected to resistor R29 and in turn to the gate of transistor IG5.

[0082] The VS pin of chip IC3 is connected to the other end of capacitor C4, the other end of capacitor E4 is connected in parallel to resistor R24, resistor R24 ​​is connected to the other end of resistor R29, and transistors IG5 and IG6 are connected in parallel to coil W;

[0083] The LO pin of chip IC3 is connected to resistor R9, which is connected to the gate of transistor IG6 and then to the other end of resistor R30.

[0084] This circuit is for driving IGBTs. Chips IC1, IC2, and IC3 are all IR2103 type driver chips. The main control module MCU sends six duty cycle signals (PWM1, PWM2, PWM3, PWM4, PWM5, and PWM6) to chips IC1, IC2, and IC3 to control the switching of six IGBTs (transistors IG1, IG2, IG3, IG4, IG5, and IG6). The IGBT control terminals have a 15V level. The six IGBTs conduct in turn, and the coils U, V, and W are energized in turn to rotate. The three sets of coils work in a cyclical and cross-operation. When the main control module outputs a 0 duty cycle signal, the motor stops.

[0085] Specifically, an example is given of the cyclical alternation of coil operation:

[0086] When the output duty cycle is 100100, that is, when the output duty cycle of PWM1 and PWM4 is 1, and the output duty cycle of PWM2, PWM3, PWM5 and PWM6 is 0, transistors IG1 and IG4 work, and then coils U and V work.

[0087] When the output duty cycle is 010010, that is, when the output duty cycle of PWM2 and PWM5 is 1, and the output duty cycle of PWM1, PWM3, PWM4 and PWM6 is 0, transistors IG2 and IG5 work, and then coils U and W work.

[0088] When the output duty cycle is 001001, that is, when the output duty cycle of PWM3 and PWM6 is 1, and the output duty cycle of PWM1, PWM2, PWM4 and PWM5 is 0, transistors IG3 and IG6 work, and then coils V and W work.

[0089] When the output duty cycle is 000000, that is, when the duty cycles of PWM1, PWM2, PWM3, PWM4, PWM5, and PWM6 are all 0, the coils U, V, and W do not work, and the motor loses power and stops working.

[0090] In summary, during the operation of a drilling machine, when the drill bit gets stuck or stalls, the motor experiences resistance in the opposite direction to its rotational speed, causing the motor to twist the machine in the opposite direction. The technical solution provided by this invention can detect this reverse twisting of the machine through a detection module installed on the machine. Once the machine reverses 45 degrees within 0.2 seconds, the main control module immediately disconnects the motor power supply through a relay module, thereby achieving an instantaneous automatic shutdown effect. The signal response is fast, preventing operators from twisting their wrists and protecting their personal safety.

[0091] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A handheld device anti-reverse twisting circuit, characterized in that: It includes a first power module, a main control module, a relay module, a detection module, and a second power module. The first power module is connected to the main control module and the relay module. The relay module is connected to the second power module. The second power module is used to supply power to the motor of the drilling machine. The detection module is installed on the drilling machine and is connected to the main control module. The main control module is connected to the relay module. The main control module detects the torsional state of the drilling machine through the detection module. When the drilling machine twists in the opposite direction, the main control module controls the relay module to disconnect the connection circuit between the first power module and the second power module, so that the second power module loses power and controls the motor to stop working.

2. The anti-reverse twisting hand circuit for handheld devices according to claim 1, characterized in that: The detection module includes a gyroscope circuit and a conversion circuit connected to the gyroscope circuit. The gyroscope circuit is installed on the drilling machine to detect the torsion of the drilling machine. The conversion circuit is connected to the main control module to convert the analog signal output by the gyroscope circuit into a digital signal.

3. The anti-reverse twisting hand circuit for handheld devices according to claim 2, characterized in that: The gyroscope circuit includes a chip U1 mounted on the drilling machine. The CLKIN pin of chip U1 is connected to capacitor C11 and grounded, and the VLOGIC pin of chip U1 is connected to the other end of capacitor C11 and connected to VCC 3.3V. The REGOUT pin of chip U1 is connected to capacitor C13, and the FSYNC pin of chip U1 is connected to the other end of capacitor C13 and grounded. The VDD pin of the chip U1 is connected to capacitor C102 and then to the VCC 3.3V terminal, and capacitor C102 is grounded; The GND pin of chip U1 is connected to capacitor C14 and grounded, and the CPOUT pin of chip U1 is connected to the other end of capacitor C14; The SCL pin of chip U1 is connected to resistor R35, resistor R35 is connected to resistor R34 and connected to VCC 3.3V terminal, and the SDA pin of chip U1 is connected to the other end of resistor R34.

4. The anti-reverse twisting hand circuit for handheld devices according to claim 1, characterized in that: The relay module includes chips IC1, IC2, and IC3, and transistors IG1, IG2, IG3, IG4, IG5, and IG6, wherein... The VCC pin of the chip IC1 is connected in parallel with capacitor C1, E1, and resistor R1 to +15V. Capacitor C1 is connected to the other end of capacitor E1 and grounded. Resistor R1 is connected to the positive terminal of diode D1. The HIN pin of the chip IC1 is connected to resistor R10 and resistor R16, and resistor R10 is connected to the PWM1 terminal; The LIN pin of the chip IC1 is connected to resistor R11 and resistor R17, and resistor R11 is connected to the PWM2 terminal; The COM pin of the chip IC1 is connected to the other end of resistor R16, the other end of resistor R17, and grounded; The VB pin of the chip IC1 is connected to the negative terminal of the diode D1 and to capacitors C2 and E2. The HO pin of the chip IC1 is connected to resistor R4, and resistor R4 is connected to resistor R25 and then to the gate of the transistor IG1. The VS pin of the chip IC1 is connected to the other end of the capacitor C2, the other end of the capacitor E2 is connected in parallel to the resistor R22, the resistor R22 is connected to the other end of the resistor R25, and the transistors IG1 and IG2 are connected in parallel to the coil U; The LO pin of the chip IC1 is connected to resistor R5. Resistor R5 is connected to the gate of transistor IG2 and connected to resistor R26. Transistor IG2 is connected to resistors R28, R30, and R31. Transistors IG4 and IG6 are connected to the other end of resistor R26. Resistor R31 is grounded. The VCC pin of the chip IC2 has capacitor C3 and resistor R2 connected in parallel to +15V, capacitor C3 grounded, and resistor R2 connected to the positive terminal of diode D2; The HIN pin of the chip IC2 is connected to resistor R12 and resistor R18, and resistor R12 is connected to the PWM3 terminal; The LIN pin of the chip IC2 is connected to resistor R13 and resistor R19 in parallel. Resistor R13 is connected to the PWM4 terminal. The COM pin of the chip IC2 is connected to the other end of resistor R18, the other end of resistor R19, and grounded; The VB pin of the chip IC2 is connected to the negative terminal of the diode D2 and to capacitors C3 and E3. The HO pin of the chip IC2 is connected to resistor R6, and resistor R6 is connected to resistor R27 and then to the gate of the transistor IG3. The VS pin of the chip IC2 is connected to the other end of the capacitor C3, the other end of the capacitor E3 is connected in parallel to the resistor R23, the resistor R23 is connected to the other end of the resistor R27, and the transistors IG3 and IG4 are connected in parallel to the coil V; The LO pin of the chip IC2 is connected to resistor R7, which is connected to the gate of the transistor IG4 and to the other end of resistor R28. The VCC pin of the chip IC3 has capacitor C5 and resistor R3 connected in parallel to +15V, capacitor C5 grounded, and resistor R3 connected to the positive terminal of diode D3; The HIN pin of the chip IC3 is connected to resistor R14 and resistor R20, and resistor R14 is connected to the PWM5 terminal. The LIN pin of the chip IC3 is connected to resistor R15 and resistor R21, and resistor R15 is connected to the PWM6 terminal. The COM pin of the chip IC3 is connected to the other end of resistor R20 and the other end of resistor R21 and grounded; The VB pin of the chip IC3 is connected to the negative terminal of the diode D3 and connected to capacitors C4 and E4; The HO pin of the chip IC3 is connected to resistor R8, and resistor R8 is connected to resistor R29 and then to the gate of the transistor IG5. The VS pin of the chip IC3 is connected to the other end of the capacitor C4, the other end of the capacitor E4 is connected in parallel to the resistor R24, the resistor R24 ​​is connected to the other end of the resistor R29, and the transistors IG5 and IG6 are connected in parallel to the coil W; The LO pin of the chip IC3 is connected to resistor R9, which is connected to the gate of the transistor IG6 and the other end of resistor R30.

5. The anti-reverse twisting hand circuit for handheld devices according to claim 4, characterized in that: The chips IC1, IC2, and IC3 are all IR2103 type driver chips.

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