KR101337978B1 - Actuator driver circuit device for having constant vibration strength to changes in the power supply - Google Patents

Abstract

The present invention relates to an actuator driver circuit device for having constant vibration strength to a change in the power supply. According to the present invention, the actuator driver circuit device for having constant vibration strength to a change in the power supply improves the driving performance of an actuator.

Description

ACTUATOR DRIVER CIRCUIT DEVICE FOR HAVING CONSTANT VIBRATION STRENGTH TO CHANGES IN THE POWER SUPPLY}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an actuator driver circuit device, and more particularly, to an actuator driver circuit device for having the same vibration even with a change in power supply.

In general, an actuator means a executor that is operated by a device command signal that broadly performs an operation in response to an input signal. The actuator receives an external force directly or indirectly to operate a switch, and transmits the operation to the internal device. It is a mechanism to open and close the door. In a narrower sense, it refers to an electric motor having a control mechanism as a device that performs mechanical work using electric energy or the like. Recently, many actuators have been used to impart vibrations to mobile phones, smart devices, game machines, etc., and various actuator control methods have been developed.

FIG. 1 is a diagram showing the configuration of an actuator driver circuit device using a conventional AMP type driver, and FIG. 2 is a diagram showing the configuration of an actuator driver circuit device using a conventional H-Bridge type driver. As shown in FIG. 1, an actuator driver circuit device using a conventional AMP type driver includes an AFE (analog front end) and a control block 11, a driver 12, and an external resistor 13. Can be. That is, the AMP type, which is a method of driving the actuator 1, has a high frequency component in terms of driving, thereby reducing the noise generated during driving, and can realize the same vibration depending on the voltage, but a lot of power The disadvantage is having consumption. The actuator driver circuit device in the case of using such an AMP type driver realizes that the actuator 1 vibrates in the same manner by locating the external resistor 13 to view the applied power and adjusting the resistance value. Since the external resistor 13 is required and the same power is not always applied to the driver IC depending on the system, when the power of the system is weak, the actuator 1 vibrates relatively weakly.

As shown in Fig. 2, the actuator driver circuit device using a conventional H-Bridge type driver includes an LPF 21 and a duty cycle detection 22 connected to a switch for applying a PWM signal. , ADC 23, 24, Supply Compensation Block 25, Feedback Control Block 26, PWM Controller 27, and H-Bridge Type Driver 28. . The H-Bridge driving method, which is one of the other methods of driving the actuator 1, has a small power consumption, but has a problem of generating a noise because it includes a high frequency component when driving the H-Bridge. have. However, when driving the actuator 1 in synchronization with the vibration frequency of the actuator 1 by using the back-EMF (B-EMF) when driving the H-Bridge can be solved the problem of the noise. This is called a driver with auto-resonance detection. In this case, in order to realize the same vibration according to the voltage, a large amount of ADCs (23, 24) are used in the circuit to monitor the values of the input and the power supply so that the actuator (1) vibrates equally. As it is used, there is a disadvantage in that the chip area is internally increased and more CLK domains than necessary are added to increase noise and chip area. In other words, the conventional actuator driver circuit device that implements the actuator to vibrate even when the power is changed uses a driver for auto-resonance detection using the B-EMF of the actuator in the H-Bridge type driving method. As shown in FIG. 1, the actuator can be improved even when the power is changed compared to the AMP driving method without the resistor being located outside as shown in FIG. 1, but a large amount of ADC is placed inside to recognize the input signal and the power value. This also caused an increase in chip area and a CLK noise issue because additional CLK circuitry was needed to increase the area and drive the ADC.

The present invention has been proposed to solve the above problems of the conventionally proposed methods, and is a relatively small method for eliminating a large amount of ADCs (analog digital converters) used in the past and generating an internal power supply (LVDD) in a feedback system. The LDO can be additionally configured to achieve the same effect by adjusting the voltage level of the PWM input signal output of the level shifter and the voltage level of the input signal (sawtooth wave) of the PWM controller, thereby simplifying configuration and control while reducing manufacturing costs. It is an object of the present invention to provide an actuator driver circuit device that has the same vibration even when a power supply is changed.

In addition, the present invention eliminates a large amount of ADC and implements the same vibration of the actuator even when the power supply changes, thereby eliminating the existing large amount of ADC and related circuits, and reducing the chip area by adding a relatively small LDO, It is an object of the present invention to provide an actuator driver circuit device that has the same vibration even with a change in power supply, which eliminates the noise issue generated by the circuit so that the driving performance of the actuator can be improved and improved.

Actuator driver circuit device to have the same vibration even in the change of power source according to the characteristics of the present invention for achieving the above object,

A low drop output (LDO) for generating and outputting an internal power supply (LVDD);

A level shifter receiving a PWM signal for generating an actuator vibration and an internal power supply LVDD of the LDO, and adjusting and outputting an output voltage level of the PWM input signal according to the internal power supply LVDD;

A low pass filter (LPF) for removing high frequency components of the PWM signal whose voltage level applied from the level shifter is adjusted;

A feedback control block connected to the actuator and receiving a back-EMF signal applied by the actuator during operation and a PWM input signal from which a high frequency component has been removed by the LPF as an input and outputting a controlled and modulated signal ( Feedback Control Block);

The feedback signal from which the high frequency component is removed and modulated from the feedback control block and the internal power supply LVDD of the LDO are input, and the sawtooth wave is adjusted to the internal power supply LVDD to generate a pulse width modulated PWM signal. PWM controller (PWM Controller) for outputting; And

And a driver for controlling the driving of the actuator according to an output (a pulse width modulated PWM signal) applied from the PWM controller.

Preferably, the LDO,

By generating the output voltage dropping the input battery voltage (VBAT) to the internal power supply (LVDD) to supply to the level shifter and the PWM controller, the output voltage level of the level shifter and the input signal (sawtooth wave) of the PWM controller The voltage level may be adjusted to the voltage of the internal power supply LVDD.

More preferably, the feedback control block,

The level shifter and the PWM controller are voltage level adjusted by an internal power supply LVDD, thereby automatically synchronizing to an internal power supply LVDD regardless of a change in the power supply VBAT in a feedback loop having a negative feedback characteristic. By operating in such a manner, the same power (voltage x current) can be supplied to the actuator.

Advantageously,

It can be configured as H-Bridge Type.

According to the actuator driver circuit device that has the same vibration even in the power supply proposed by the present invention, the LDO that removes a large amount of ADC (analog digital converter) that is used in the past and generates an internal power supply (LVDD) in the feedback system Additional configuration can be achieved by adjusting the voltage level of the PWM input signal output of the level shifter and the voltage level of the input signal (sawtooth wave) of the PWM controller to achieve the same effect, thereby simplifying the configuration and control while reducing manufacturing costs. have.

In addition, according to the present invention, by eliminating a large amount of ADC and realizing the same vibration of the actuator even in the change of power source, the existing large amount of ADC and related circuits are eliminated, and the additional configuration of the relatively small LDO, reducing the chip area, ADC The noise issue created by the associated circuitry can be eliminated to improve and improve the drive performance of the actuator.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a diagram showing the configuration of an actuator driver circuit device using a conventional AMP type driver.
Fig. 2 is a diagram showing the configuration of an actuator driver circuit device using a conventional H-Bridge type driver.
3 is a diagram illustrating a configuration of an actuator driver circuit device to have the same vibration even with a change in power supply according to an embodiment of the present invention.
4 is a diagram illustrating an internal configuration of a PWM controller of an actuator driver circuit device to have the same vibration even with a change in power supply according to an embodiment of the present invention.
5 is a diagram illustrating a driver configuration of an actuator driver circuit device to have the same vibration even with a change in power supply according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, in order that those skilled in the art can easily carry out the present invention. In the following detailed description of the preferred embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. In the drawings, like reference numerals are used throughout the drawings.

In addition, in the entire specification, when a part is referred to as being 'connected' to another part, it may be referred to as 'indirectly connected' not only with 'directly connected' . In addition, the term 'comprising' of an element means that the element may further include other elements, not to exclude other elements unless specifically stated otherwise.

3 is a view showing the configuration of the actuator driver circuit device to have the same vibration even in the power supply change according to an embodiment of the present invention, Figure 4 is the same vibration in the power supply change according to an embodiment of the present invention FIG. 5 is a diagram illustrating an internal configuration of a PWM controller of an actuator driver circuit device to have the same, and FIG. 5 illustrates a driver configuration of the actuator driver circuit device to have the same vibration even with a change in power supply according to an embodiment of the present invention. One drawing. As shown in FIG. 3, an actuator driver circuit device that has the same vibration even with a change in power supply according to an embodiment of the present invention includes a low drop output (LDO) 110 and a level shifter ( 120, a low pass filter (LPF) 130, a feedback control block 140, a PWM controller 150, and a driver 160. Can be.

The LDO 110 generates an internal power supply LVDD and outputs it to the level shifter 120 and the PWM controller 150 which will be described later. The LDO 110 is an internal power generation circuit. The LDO 110 generates an output voltage dropping the input battery voltage VBAT as the internal power supply LVDD and supplies the level shifter 120 and the PWM controller 150 to the level shifter. The voltage level of the output of 120 and the voltage level of the input signal (sawtooth wave) of the PWM controller 150 can be adjusted to the voltage of the internal power supply LVDD. That is, as shown in FIG. 2, the LDO 110 may remove a large amount of ADC (analog digital converter) from an actuator driver circuit device using a conventional H-Bridge type driver, and the ADC related circuit may generate the LDO 110. Allows you to eliminate the reason for noise.

The level shifter 120 receives a PWM input signal for generating vibration of the actuator 1 and an internal power supply LVDD of the LDO 110, and adjusts an output voltage level of the PWM input signal according to the internal power supply LVDD. It adjusts and prints out.

The LPF 130 serves to remove high frequency components of the PWM signal whose voltage level applied from the level shifter 120 is adjusted. The LPF 130 passes a frequency band lower than a given cutoff frequency among the frequency components included in the PWM signal, and attenuates the higher frequency band.

The feedback control block 140 is connected to the actuator 1 and receives a PWM input signal from which a high frequency component is removed by the LPF 130 and a back-EMF signal applied by the actuator 1 when driven. It takes the input and outputs the controlled and modulated signal. The feedback control block 140 has a negative feedback characteristic by adjusting the voltage level of the output of the level shifter 120 and the input signal (sawtooth wave) of the PWM controller 150 to the internal power supply LVDD. The same power (voltage x current) can be supplied to the actuator 1 by operating in synchronization with the internal power supply LVDD regardless of the power change automatically in a loop (Electro Motive Force Detection Feedback Loop). Make sure That is, the feedback control block 140 uses the PWM controller 150 as a feedback signal according to the driving signal value applied to the actuator 1, and the PWM signal is turned on based on the result formed in the feedback loop. You can adjust the on / off time.

The PWM controller 150 receives a feedback signal from which the high frequency component is removed and modulated from the feedback control block 140 and the internal power supply LVDD of the LDO 110, and applies a sawtooth wave adjusted to the internal power supply LVDD. The pulse width modulated PWM signal is generated and output. The PWM controller 150 is applied with an internal power supply LVDD and a battery voltage VBAT. That is, as shown in FIG. 4, the PWM controller 150 outputs the output of the saw tooth wave generator of the LVDD domain and the feedback control block 140 to adjust the on / off time of the driver 160. It can be configured as a comparator that receives the output of) as an input and generates PWM.

The driver 160 controls the driving of the actuator 1 in accordance with an output (a pulse width modulated PWM signal) applied from the PWM controller 150. As shown in FIG. 5, the driver 160 is configured as an H-Bridge Type. The driver 160 applies the same power (voltage x current) to the actuator 1 according to the signal value transmitted from the PWM controller 150, so that the actuator 1 is equal to the change in the battery power VBAT. Voltage x current) is supplied to implement vibration having the same vibration intensity. Here, the actuator 1 may be configured as one of a linear resonant actuator or an eccentric rotating mass. FIG. 5 illustrates in detail a driver configuration of an actuator driver circuit device to have the same vibration even with a change in power supply according to an embodiment of the present invention. Here, the driving of the H-bridge type driver 160 is a well-known configuration widely used for driving the actuator 1, and thus unnecessary description thereof will be omitted.

In the actuator driver circuit device to have the same vibration even when the power source is changed according to the embodiment of the present invention as described above, the LDO 110, which is an internal power source generation circuit for generating the internal power source LVDD, is added. When the output level of the level shifter 120 and the output level of the saw tooth wave generator constituting the PWM controller 150 are adjusted to the generated internal power supply LVDD, a feedback loop having a negative feedback characteristic Is automatically synchronized with the internal power level to supply the same power to the actuator 1, and only the same power (voltage × current) is applied to the actuator 1 to implement the same vibration. Implemented in principle. As a result, the ADC-related circuit is generated while eliminating a large amount of ADC and related circuitry and adding a relatively small LDO 110 in the conventional actuator driver circuit arrangement shown in FIG. Eliminating possible noise issues can also improve the performance of actuator driver circuitry.

The present invention may be embodied in many other specific forms without departing from the spirit or essential characteristics of the invention.

110: LDO (Low Drop Output) 120: Level Shifter
130: low pass filter 140: feedback control block
150: PWM controller 160: driver

Claims (4)

A low drop output (LDO) 110 generating and outputting an internal power supply LVDD;
A level shifter that receives a PWM signal for generating vibration of the actuator 1 and an internal power supply LVDD of the LDO 110, and adjusts and outputs a voltage level of the PWM input signal output according to the internal power supply LVDD. Level Shifter 120;
A low pass filter (LPF) 130 for removing high frequency components of the PWM signal whose voltage level applied from the level shifter 120 is adjusted;
It is connected to the actuator 1 and receives a back-EMF signal applied by the actuator 1 and a PWM input signal from which a high frequency component has been removed by the LPF 130 as an input. A feedback control block 140 for outputting a processed signal;
The feedback signal from which the high frequency component has been removed and modulated from the feedback control block 140 and the internal power supply LVDD of the LDO 110 are received, and a sawtooth wave adjusted to the internal power supply LVDD is applied to obtain a pulse width. A PWM controller 150 for generating and outputting a modulated PWM signal; And
And a driver (160) for controlling the driving of the actuator (1) in accordance with an output (pulse width modulated PWM signal) applied from the PWM controller (150). Actuator driver circuit arrangement to have the same vibration.
The method of claim 1, wherein the LDO 110,
By generating an output voltage dropping the input battery voltage (VBAT) to the internal power supply (LVDD) to supply to the level shifter 120 and the PWM controller 150, the output voltage level of the level shifter 120, and Actuator to have the same vibration in the power supply change, characterized in that the saw tooth wave generator output voltage level constituting the PWM controller 150 is adjusted to the voltage of the internal power supply (LVDD) Driver circuit device.
The method of claim 2, wherein the feedback control block 140,
Since the level shifter 120 and the PWM controller 150 adjust the voltage level with the internal power supply LVDD, the internal power supply LVDD regardless of the power supply change automatically in a feedback loop having a negative feedback characteristic. Actuator circuit arrangement so that the same power (voltage x current) can be supplied to the actuator (1) by operating in synchronization with the same.
The method of claim 1, wherein the driver 160,
An actuator driver circuit device configured to have the same vibration even in the change of power source, characterized in that it is constituted by H-Bridge Type.

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