阅读说明：本技术 一种四相五线步进电机驱动ic (Four-phase five-wire stepping motor driving IC ) 是由 方帅 于 2020-07-28 设计创作，主要内容包括：本发明涉及电机驱动技术领域,具体为一种四相五线步进电机驱动IC,其能够对异常情况起到保护作用,减少控制难度,其包括芯片本体,所述芯片本体上设置有VCC脚、OUT脚、GND脚和控制脚,其特征在于,所述芯片本体包括Logic控制模块,所述Logic控制模块通过四个MOS管连接四个所述OUT脚,所述Logic控制模块还连接OTP电路、OCP电路和UVLO电路,所述ULVO电路与所述VCC脚相连,所述控制脚包括DIR脚和PFM脚,所述DIR脚用于控制电机工作状态,所述PFM用于控制电机运转速度,所述PFM脚直接与所述Logic控制模块相连,所述DIR脚通过Detect模块与所述Logic控制模块相连。(The invention relates to the technical field of motor driving, in particular to a four-phase five-wire stepping motor driving IC which can protect abnormal conditions and reduce control difficulty and comprises a chip body, wherein the chip body is provided with a VCC pin, an OUT pin, a GND pin and a control pin.)

1. The four-phase five-wire stepping motor driving IC is characterized in that the chip body comprises a Logic control module, the Logic control module is connected with four OUT pins through four MOS (metal oxide semiconductor) tubes, the Logic control module is further connected with an OTP (one time programmable) circuit, an OCP (optical clock) circuit and a UVLO (ultraviolet laser) circuit, the ULVO circuit is connected with the VCC pin, the control pin comprises a DIR pin and a PFM (pulse width modulation) pin, the DIR pin is used for controlling the working state of a motor, the PFM is used for controlling the running speed of the motor, the PFM pin is directly connected with the Logic control module, and the DIR pin is connected with the Logic control module through a Detect module.

2. The four-phase five-wire stepping motor driving IC according to claim 1, wherein the Logic control module comprises a counter, a two-four decoder, and a not gate.

Technical Field

The invention relates to the technical field of motor driving, in particular to a four-phase five-wire stepping motor driving IC.

Background

The stepping motor is widely applied to various mechanical automation equipment, and the four-phase five-wire stepping motor has the characteristics of large torque and simple control mode in the stepping motor. The traditional control circuit mainly has two modes of 4 NMOS or ULN2003 integrating Darlington tubes to realize the control of the four-phase five-wire stepping motor.

The typical four-phase five-wire stepping motor control circuit adopts two modes of 4 NMOS or ULN2003 integrating Darlington tubes, although the circuit is simple and low in cost, the abnormal processing function which may occur is lacked in the operation of the motor, the motor cannot normally operate when low voltage, overcurrent and the like occur, and the input control pins are 4I/O ports, so that the control requirement is high.

Disclosure of Invention

In order to solve the problems of the existing four-phase five-wire stepping motor driving IC and high control requirement under abnormal conditions, the invention provides a four-phase five-wire stepping motor driving IC which can protect the abnormal conditions and reduce the control difficulty.

The technical scheme is as follows: the four-phase five-wire stepping motor driving IC is characterized in that the chip body comprises a Logic control module, the Logic control module is connected with four OUT pins through four MOS (metal oxide semiconductor) tubes, the Logic control module is further connected with an OTP (one time programmable) circuit, an OCP (optical clock) circuit and a UVLO (ultraviolet laser) circuit, the ULVO circuit is connected with the VCC pin, the control pin comprises a DIR pin and a PFM (pulse width modulation) pin, the DIR pin is used for controlling the working state of a motor, the PFM is used for controlling the running speed of the motor, the PFM pin is directly connected with the Logic control module, and the DIR pin is connected with the Logic control module through a Detect module.

The Logic control module is further characterized by comprising a counter, a two-four decoder and a NOT gate.

After the invention is adopted, the OTP circuit, the OCP circuit and the UVLO circuit are added in the chip body to respectively play roles of over-temperature protection, over-current protection and low-voltage detection protection, so that the chip protection is realized when the chip is abnormal, and the control pins are reduced into two, thereby greatly reducing the control requirement.

Drawings

FIG. 1 is a schematic diagram of the present invention;

FIG. 2 is a schematic diagram of the Detect module and the Logic control module.

Detailed Description

As shown in fig. 1, a four-phase five-wire stepping motor driving IC includes a chip body, a VCC pin, an OUT pin, a GND pin and a control pin are disposed on the chip body, the chip body includes a Logic control module, the Logic control module is connected with the four OUT pins through four MOS transistors, the Logic control module is further connected with an OTP circuit, an OCP circuit and a UVLO circuit, a ULVO circuit is connected with the VCC pin, the control pin includes a DIR pin and a PFM pin, the DIR pin is used for controlling a motor working state, the PFM is used for controlling a motor operating speed, the PFM pin is directly connected with the Logic control module, the DIR pin is connected with the Logic control module through a Detect module, as shown in fig. 2, the Detect module mainly includes a voltage dividing resistor and two comparators. The Logic control module is also connected with the OSC module and is a clock oscillation circuit.

VCC provides power for the entire control IC; the UVLO circuit has a low-voltage detection protection function, and the output function is closed when the power voltage is lower than a normal value; the OCP circuit detects the current value of the MOS, and the output function is closed intermittently when the current value is too large; the OTP current provides temperature protection and turns off the output function when the temperature value of the driver IC is too high.

The Logic control module mainly performs Logic signal processing, and comprises a counter, a two-four decoder, a not gate and the like, specifically, a half part shown in fig. 2, so as to realize a four-bit cyclic shift register with only 1bit as a high level.

DIR foot is motor direction control foot, controls motor operating condition, and when DIR foot was the high level, the motor corotation, output signal sequence is: OUT1, OUT2, OUT3, OUT 4; when the DIR pin is at a low level, the sequence of the motor reverse output signals is as follows: OUT4, OUT3, OUT2, OUT 1; when the DIR pin is in a suspended state, the motor stops working, and the OUT1, OUT2, OUT3 and OUT4 turn off the output function

The PFM pin is a pulse frequency modulation input pin and directly determines the running speed of the four-phase five-wire stepping motor.

The following are specific examples: the power supply is 5V, the common pin of the four-phase five-wire stepping motor and the VCC pin of the chip body are connected, and the OUT1, OUT2, OUT3 and OUT4 pins are sequentially connected with the output pin of the four-phase five-wire stepping motor. Two I/O ports of the MCU are respectively connected with the DIR pin and the PFM pin, the PFM pin provides a frequency signal, the motor rotates forwards when the DIR pin is high, the motor rotates backwards when the DIR pin is low, and the stepping motor is in a stop state when an input signal of the DIR pin is suspended, namely high impedance. When the temperature of the chip body is overhigh or the motor current is overlarge during the operation of the motor, the output state is closed although the DIR pin and the PFM pin have signals.