Motor driver module with adjustable output pulse width modulation control signal

Abstract

The invention relates to a motor driving module capable of adjusting an output pulse width modulation control signal. The motor driving device consists of a latch forced starting device, a voltage adjusting circuit and a frequency adjusting circuit, wherein the voltage adjusting circuit is formed outside the latch forced starting device; the latch forced starting device comprises a comparator and a motor starting controller; the comparator is provided with a first input end and a second input end; the first input end is connected with the external voltage adjusting circuit and a switch; the first input end of the motor starting controller is connected with a pulse wave generator, the other input end of the motor starting controller is connected with an oscillator, and an output end of the motor starting controller is connected with the switch; and the motor starting controller is controlled to output a high-voltage signal to control the switch so as to control an output pulse width modulation signal of the comparator through a pulse wave signal generated by the pulse wave generator and counting to a set time by the oscillator.

Description

technical field [0001] The present invention relates to a motor drive module capable of adjusting the rotational speed of the motor, in particular to a motor drive module used in a non-micro-control mode, through the design of an external circuit and a motor drive device, the drive of the motor The pulse width modulation (PWM) speed signal output by the device can be adjusted according to the external circuit. Background technique [0002] Due to the diverse characteristics of consumer products, and in order to reduce the manufacturing cost of products, some consumer products without microcontroller mode (Non-MCU), such as hair dryers, microwave ovens, ovens, instruments or light-emitting diode (LED) lighting Devices and other products are not equipped with micro-control devices; in addition, the heat dissipation requirements of these products are also different. Therefore, when a motor drive module is used in an operation mode without a micro-control signal, since there is...

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Problems solved by technology

However, both of these methods have their limitations in application. Figure 1A As shown in the method of changing the motor load, when it is applied to some small-sized and low-load fans, this method will have its winding limit

And with Figure 1B As far as the way of changing the operating voltage is shown, there will be a minimum operating voltage limit and the complexity that the voltage must be changed for different applications

The current solution to changing the voltage is to connect a resistor in series at the load end to meet different application requirements, such as Figure 1A shown; but this method has a big disadvantage, which is to increase the power consumption, thereby reducing the efficiency of the fan motor

[0004] In addition, when the motor is used in low-speed applications, the problems encountered include: First, because it is used in the motor drive module without a micro-control device, it cannot judge whether the motor has been started, but can only use the set The starting power is used to drive the motor; however, since the starting torque (torque) required when the motor is just started is relatively large, when the motor is set at a low speed, the starting torque (torque) may not be sufficient, resulting in When the motor is first started, there is a possibility that it will not be able to run

Secondly, when the motor is stopped due to the influence of external force or irresistible factors, when the motor is started again, the motor cannot be started again because of the starting torque.

Therefore, if the motor cannot be started and the motor drive module continues to supply voltage to the motor according to the setting, in addition to increasing power consumption, it may also cause the motor to burn out

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