Brushless motor control circuit for ink-jet printer

Abstract

The utility model discloses a brushless motor control circuit used for an ink-jet printer, comprising an MCU controller, the output end of the MCU controller is respectively connected with the input ends of a U9 gate drive IC and a U10 gate drive IC, the output end of the U9 gate drive IC is connected with a Q5 wide voltage NMOS and a Q6 wide voltage NMOS, the output end of the U10 gate drive IC is connected with a Q7 wide voltage NMOS and a Q8 wide voltage NMOS, four wide voltage NMOS are arranged, and the output end of the U9 gate drive IC is connected with the output end of the Q7 wide voltage NMOS and the output end of the Q8 wide voltage NMOS. Adaptability to voltage and current requirements of different brushless motors is achieved, different PWM is output through the MCU controller, and current information is collected through control and feedback resistors, so that alternate conduction of four NMOS is accurately controlled, the precision of rotating speed control is improved, and the service life of the brushless motor is prolonged. The problems that a traditional brushless motor drive circuit is narrow in use voltage range, a control circuit is complex, the self-protection function cannot be achieved in the reversing process, the rotating speed control precision is not high, and the use cost is relatively high are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of printing equipment, in particular to a brushless motor control circuit for an inkjet printer. Background Art

[0002] The motor for moving the inkjet printer's printhead is mainly a servo motor, which is very expensive. With the advancement of the new generation of digital inkjet printer technology, the customer base is becoming more and more popular among the general public. Ordinary customers are becoming more and more sensitive to the price of inkjet printers, which leads to a question: how to use brushless DC motors instead of servo motors to further reduce the cost of printers? And ensure that the printer can work safely and efficiently.

[0003] The traditional brushless DC motor drive circuit has a narrow voltage range, a complex control circuit, and cannot achieve self-protection during the commutation process. The speed control accuracy is not high and the cost of use is relatively expensive. Summary of the invention

[0004] In order to overcome the above problems, the utility model proposes a novel DC brushless motor drive circuit for an inkjet printer, which aims to ensure that the brushless motor can work safely and efficiently, has a wide voltage application range, and has high control accuracy on the speed of the brushless motor.

[0005] The technical solution of the utility model is achieved in this way:

[0006] A brushless motor control circuit for an inkjet printer comprises an MCU controller, wherein an output end of the MCU controller is respectively connected to an input end of a U9 gate drive IC and an input end of a U10 gate drive IC, an output end of the U9 gate drive IC is connected to a Q5 wide voltage NMOS and a Q6 wide voltage NMOS, an output end of the U10 gate drive IC is connected to a Q7 wide voltage NMOS and a Q8 wide voltage NMOS, an output end of the Q5 wide voltage NMOS and a Q6 wide voltage NMOS is connected to a positive electrode of a brushless motor, and an output end of the Q7 wide voltage NMOS and a Q8 wide voltage NMOS is connected to a negative electrode of the brushless motor.

[0007] Furthermore, the Q6 wide voltage NMOS output terminal and the Q8 wide voltage NMOS output terminal are both connected to current detection resistors.

[0008] Furthermore, the output end of the detection current resistor is connected to an MCU controller.

[0009] Furthermore, the Q5 wide voltage NMOS and the Q6 wide voltage NMOS are the high voltage side C62, and the Q7 wide voltage NMOS and the Q8 wide voltage NMOS are the high voltage side C63.

[0010] Furthermore, the U9 gate driver IC and the U10 gate driver IC are both driver devices of model IRS2003S.

[0011] Furthermore, the maximum operating voltage of the floating channels of C62 and C63 can reach 250V.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] The utility model realizes adaptability to voltage and current requirements of different brushless motors by setting 4 wide voltage NMOS, namely Q5 wide voltage NMOS, Q6 wide voltage NMOS, Q7 wide voltage NMOS and Q8 wide voltage NMOS, thereby expanding the voltage range of the circuit and solving the problem that the traditional circuit has a narrow voltage range. The utility model adopts U9 gate driver IC and U10 gate driver IC of model IRS2003A and utilizes their own pulse width detection function to realize self-protection, simplify circuit design, reduce the complexity of the control circuit, and improve the stability of the control circuit. Through the pulse width detection function of IRS2003A, the wide voltage NMOS is protected for safe use, and burnout due to too short dead time during commutation is avoided, thereby realizing the self-protection function and improving the reliability of the system.

[0014] The utility model also outputs different PWM through the MCU controller, controls and collects current information through feedback resistors, thereby accurately controlling the alternating conduction of the four NMOSs, and improving the accuracy of the speed control. In summary, the utility model solves the problems of the traditional DC brushless motor drive circuit having a narrow voltage range, a complex control circuit, and the inability to achieve a self-protection function during the commutation process, low speed control accuracy, and relatively expensive use cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a circuit diagram of a brushless motor control circuit for an inkjet printer according to the utility model;

[0016] Figure 2 This is one of the working principle diagrams of a brushless motor control circuit for an inkjet printer of the utility model;

[0017] Figure 3 This is the second working principle diagram of a brushless motor control circuit for an inkjet printer of the utility model. DETAILED DESCRIPTION

[0018] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below 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. Example

[0019] like Figure 1-3 As shown, this embodiment provides a brushless motor control circuit for an inkjet printer, which has the ability to output large current pulses and anti-through dead zone logic, wherein the floating channels of the U9 gate driver IC and the U10 gate driver IC can be used to drive the high-voltage side C62 and C63, and the maximum operating voltage of the floating channels of C62 and C63 can reach 250V, which greatly meets the NMOS driving requirements on the market, as follows:

[0020] A brushless motor control circuit for an inkjet printer comprises an MCU controller, wherein an output end of the MCU controller is respectively connected to an input end of a U9 gate drive IC and an input end of a U10 gate drive IC, an output end of the U9 gate drive IC is connected to a Q5 wide voltage NMOS and a Q6 wide voltage NMOS, an output end of the U10 gate drive IC is connected to a Q7 wide voltage NMOS and a Q8 wide voltage NMOS, an output end of the Q5 wide voltage NMOS and a Q6 wide voltage NMOS is connected to a positive electrode of a brushless motor, and an output end of the Q7 wide voltage NMOS and a Q8 wide voltage NMOS is connected to a negative electrode of the brushless motor.

[0021] Furthermore, the Q6 wide voltage NMOS output terminal and the Q8 wide voltage NMOS output terminal are both connected to current detection resistors, and the current detection resistors are used to collect current information.

[0022] Furthermore, the output end of the current detection resistor is connected to the MCU controller to feed back the current information to the MCU controller in a timely manner.

[0023] Furthermore, the Q5 wide voltage NMOS and the Q6 wide voltage NMOS are the high voltage side C62, and the Q7 wide voltage NMOS and the Q8 wide voltage NMOS are the high voltage side C63.

[0024] Furthermore, the U9 gate driver IC and the U10 gate driver IC are both IRS2003S driver devices. IRS2003A has a built-in pulse width detection function. When the input pulse width is less than 1us, the input pulse cannot be transmitted normally. This can effectively protect the safety of wide voltage NMOS and prevent it from burning out due to too short dead time during commutation, thus realizing the self-protection function.

[0025] Furthermore, the maximum operating voltage of the floating channels of C62 and C63 can reach 250V.

[0026] The working principle of the utility model is as follows:

[0027] The MCU controller collects current information through feedback resistors by outputting different PWMs, and adjusts and controls the PWM output by U9 gate driver IC and U10 gate driver IC to control the alternating conduction of Q5 wide voltage NMOS, Q6 wide voltage NMOS, Q7 wide voltage NMOS and Q8 wide voltage NMOS. The conduction time of Q5 wide voltage NMOS, Q6 wide voltage NMOS, Q7 wide voltage NMOS and Q8 wide voltage NMOS is used to achieve precise control of the speed, as well as the forward and reverse rotation of the motor, while also protecting the safe operation of the brushless motor.

[0028] When implementing the commutation of the brushless motor, the utility model only needs to control the cross conduction of Q5 wide voltage NMOS, Q6 wide voltage NMOS, Q7 wide voltage NMOS and Q8 wide voltage NMOS, such as Q5 wide voltage NMOS and Q8 wide voltage NMOS are turned on at the same time, Q7 wide voltage NMOS and Q6 wide voltage NMOS are turned on at the same time, which solves the commutation problem of the brushless motor very well.

[0029] Because the LBH and LBL of the U9 gate driver IC will not output high level at the same time, and the RBH and RBL of the U10 gate driver IC will not output high level at the same time, there is no problem of Q5 wide voltage NMOS, Q6 wide voltage NMOS or Q7 wide voltage NMOS, Q8 wide voltage NMOS being turned on at the same time and causing the wide voltage NMOS to burn out. Because the MOS tube is turned on very quickly and efficiently, the DC brushless motor can work efficiently.

[0030] Since the voltage and current capabilities of the drive circuit output to the brushless motor are determined by the four NMOS tubes Q5 wide voltage NMOS, Q6 wide voltage NMOS, Q7 wide voltage NMOS and Q8 wide voltage NMOS, the circuit has good adaptability to wide voltage and large current;

[0031] Different brushless motors require different voltages and currents. Simply adjusting these four NMOSs can easily meet the requirements of various DC brushless motors.

Claims

1. A brushless motor control circuit for an inkjet printer, characterized in that: It includes an MCU controller, wherein the output end of the MCU controller is respectively connected to the input ends of U9 gate driver IC and U10 gate driver IC, the output end of U9 gate driver IC is connected to Q5 wide voltage NMOS and Q6 wide voltage NMOS, the output end of U10 gate driver IC is connected to Q7 wide voltage NMOS and Q8 wide voltage NMOS, the output ends of Q5 wide voltage NMOS and Q6 wide voltage NMOS are connected to the positive pole of the brushless motor, and the output ends of Q7 wide voltage NMOS and Q8 wide voltage NMOS are connected to the negative pole of the brushless motor.

2. A brushless motor control circuit for an inkjet printer according to claim 1, characterized in that: The wide voltage NMOS output terminal of Q6 and the wide voltage NMOS output terminal of Q8 are both connected with a current detection resistor.

3. A brushless motor control circuit for an inkjet printer according to claim 2, characterized in that: The output end of the current detection resistor is connected to the MCU controller.

4. A brushless motor control circuit for an inkjet printer according to claim 1, characterized in that: The Q5 wide voltage NMOS and the Q6 wide voltage NMOS are the high voltage side C62, and the Q7 wide voltage NMOS and the Q8 wide voltage NMOS are the high voltage side C63.

5. A brushless motor control circuit for an inkjet printer according to claim 4, characterized in that: The maximum operating voltage of the floating channels of C62 and C63 can reach 250V.

6. A brushless motor control circuit for an inkjet printer according to claim 1, characterized in that: The U9 gate driver IC and the U10 gate driver IC are both driver devices with model number IRS2003S.

Images