System, driver ic, and method for driving and status diagnosis of adaptive control-based piezo haptic actuator

Abstract

The present invention relates to an adaptive control-based haptic vibration system for driving a piezo haptic vibration device, comprising: a reference voltage generator for generating a reference voltage on the basis of a driving condition of the haptic vibration device; a boost converter for generating an output voltage on the basis of the generated reference voltage and an output voltage determination ratio; a differential amplifier which receives the output voltage of the boost converter as an input, and which amplifies the received input signal so as to generate a driving signal; and a haptic vibration device operated by the generated driving signal, wherein the output voltage determination ratio is determined on the basis of an amplification ratio of the differential amplifier.

Description

System, driver IC, and method for driving and status diagnosis of an adaptive control-based PIEZO haptic actuator

[0001] The present invention relates to an Adaptive Control-based piezo haptic vibration system for driving a haptic vibration device and a method for driving an Adaptive Control-based piezo haptic vibration device.

[0002] The present invention relates to a haptic vibration system for diagnosing the state of a haptic vibration device, a driver integrated circuit, and a method for diagnosing the state of a haptic vibration device.

[0003] A piezo haptic actuator is a technology that generates vibrations based on voltage input using piezoelectric materials with capacitive properties. This requires high voltages ranging from tens to hundreds of volts, and a boost converter is used to amplify the voltage. The boost converter is set based on the maximum driving voltage of a conventional piezo actuator and always outputs a high voltage regardless of the driving frequency or output waveform.

[0004] Consequently, there is a problem of unnecessary power consumption caused by outputting a voltage higher than actually required. Due to the characteristics of Piezo Actuators, which have high capacitances ranging from tens of nF to several μF, the boost converter output power consumption is high, and this has the disadvantage of being inefficient in battery-based devices. In particular, since power efficiency is important in environments with high battery dependency, such as mobile devices, wearable devices, and electronic game consoles, there is a need for a Piezo haptic actuator with an improved structure.

[0005] In various user interface devices, including electronic devices, methods that stimulate the user's sense of touch using haptic technology are widely used. In particular, piezo-based haptic vibration devices capable of implementing precise vibrations have fast response speeds and are widely applied in smartphones, tablets, laptops, automotive displays, and wearable devices.

[0006] In conventional haptic vibration systems, a control command from a control unit is transmitted to a driver integrated circuit through an interface unit, and a communication unit and a processing unit within the driver integrated circuit analyze this control command and control a driving unit to drive a haptic vibration device.

[0007] However, these conventional haptic systems have a problem in that they lack the ability to check in advance or diagnose in real time whether the haptic vibration device is operating normally. The capacitance of the actuator of the haptic vibration device may change due to the influence of external environments such as mechanical shock or temperature changes, or due to internal defects. Consequently, the driving current may increase, causing an overload on the power supply or resulting in malfunctions such as failure to output the intended vibration effect.

[0008] In addition, if the haptic vibration device is disconnected from the connection line with the driver integrated circuit, the driving signal is not transmitted and the vibration effect does not occur, and conversely, if a short circuit occurs, excessive current flows through the driving unit, which can lead to damage to the driver integrated circuit.

[0009] Nevertheless, conventional technology does not have an internal diagnostic function to determine the connection status of the haptic vibration device, such as whether it is disconnected or short-circuited, or whether there is an abnormality in the capacitance of the actuator, so users have the inconvenience of having to recognize abnormalities in the vibration device's status retrospectively or perform inspections through separate external equipment.

[0010] Therefore, technology is required to diagnose the capacitance, open circuit, and short circuit conditions of a haptic vibration device within the driver integrated circuit.

[0011] The present invention aims to solve the problem in the prior art where the output voltage of a boost converter is fixed, requiring the maximum output voltage to always be maintained regardless of driving conditions.

[0012] The present invention aims to solve the problem of conventional technology, which consumes more power than necessary even under low amplitude or low frequency driving conditions, thereby causing unnecessary energy waste and system heat generation.

[0013] The present invention aims to solve the problem in which the fixed output voltage of the conventional technology fails to adapt to changes when driving conditions change.

[0014] The present invention aims to solve the problem in which power consumption cannot be efficiently managed because conventional technology outputs a constant high voltage regardless of the voltage required by the load (Piezo Actuator).

[0015] The present invention aims to solve the problem where system heat generation increases as power consumption increases, and where heat generation issues have an adverse effect on system stability in miniaturized devices such as mobile and wearable devices.

[0016] The present invention aims to output only the necessary voltage by adjusting the output voltage of a boost converter in real time to match driving conditions through an Adaptive Control mechanism.

[0017] The present invention enables the actuator capacitance to change when the haptic vibration device is deformed or deteriorated, and thus allows for the diagnosis of abnormalities by measuring this in advance within the driver integrated circuit.

[0018] The present invention enables the driver integrated circuit to detect and notify the haptic vibration system that a vibration effect is not generated when a disconnection occurs.

[0019] The present invention enables early detection and protection functions, as excessive current may flow through the driver integrated circuit and cause IC damage when a short circuit occurs.

[0020] The present invention enables the internal determination of actuator capacitance, open circuits, short circuits, etc., without the need for separate external test equipment by incorporating a diagnostic function within the driver integrated circuit.

[0021] The present invention relates to an Adaptive Control-based haptic vibration system for driving a Piezo haptic vibration device, comprising: a reference voltage generator that generates a reference voltage based on driving conditions of the haptic vibration device; a boost converter that generates an output voltage based on the generated reference voltage and an output voltage determination ratio; a differential amplifier that receives the output voltage of the boost converter as an input and amplifies the received input signal to generate a driving signal; and a haptic vibration device that operates by the generated driving signal; wherein the output voltage determination ratio is determined based on the amplification ratio of the differential amplifier.

[0022] In addition, the amplification ratio of the differential amplifier is defined by the first resistance value and the second resistance value of the differential amplifier, and is the value obtained by dividing the second resistance value by the first resistance value.

[0023] In addition, the amplification ratio is the value obtained by dividing the second resistance value by the first resistance value.

[0024] In addition, the reference voltage generator is configured to generate the reference voltage based on the final driving voltage of the haptic vibration device.

[0025] In addition, the reference voltage generator is configured to generate the reference voltage based on at least one of the amplitude of the final driving voltage of the haptic vibration device and the frequency of the final driving voltage.

[0026] In addition, the boost converter is configured to adjust the output voltage in real time based on the generated reference voltage and output voltage determination ratio.

[0027] Additionally, the boost converter is configured to generate an output voltage below a threshold when at least one of the amplitude of the final driving voltage of the haptic vibration device and the frequency of the final driving voltage is below a threshold, and is configured to generate an output voltage above a threshold when at least one of the amplitude of the final driving voltage of the haptic vibration device and the frequency of the final driving voltage is above a threshold.

[0028] The present invention relates to a method for driving an Adaptive Control-based Piezo haptic vibration device, comprising: a reference voltage generation step for generating a reference voltage based on driving conditions of the haptic vibration device; an output voltage generation step for generating an output voltage based on the generated reference voltage and an output voltage determination ratio; an input signal amplification step for receiving the output voltage as an input and amplifying the received input signal; a driving signal generation step for generating a driving signal based on the amplified input signal; and an operation step for operating by the generated driving signal; wherein the output voltage generation step further comprises a step of determining the output voltage determination ratio based on the amplification ratio in which the input signal is amplified in the input signal amplification step.

[0029] Additionally, the output voltage generation step further includes the step of generating the output voltage based on the output voltage determination ratio defined based on the first resistance and the second resistance of the boost converter of the haptic vibration device.

[0030] Additionally, the input signal amplification step further includes a step of amplifying the input signal received based on the amplification ratio defined based on the first resistance and the second resistance of the differential amplifier of the haptic vibration device.

[0031] Additionally, the reference voltage generation step further includes the step of generating the reference voltage based on at least one of the amplitude and frequency of the haptic vibration device.

[0032] Additionally, the driving signal generation step; further comprises a step in which a differential amplifier of the haptic vibration device amplifies the input signal to generate the driving signal; and an operation step operated by the generated driving signal; wherein the generated driving signal forms the basis of the driving waveform of the haptic vibration device.

[0033] The present invention relates to a haptic vibration system for diagnosing the state of a haptic vibration device, comprising: a haptic vibration device; and a driver integrated circuit configured to diagnose the state of the haptic vibration device; wherein the driver integrated circuit comprises: a diagnostic unit; wherein the diagnostic unit comprises: a diagnostic current supply unit configured to apply current to the haptic vibration device; a capacitance detection node configured to detect a first terminal voltage of the haptic vibration device; a disconnection detection node configured to detect a second terminal voltage of the haptic vibration device; a capacitance determination signal output unit configured to output a capacitance determination signal by comparing the voltage of the capacitance detection node with a reference voltage; and a disconnection determination signal output unit configured to output a disconnection determination signal by comparing the voltage of the disconnection detection node with a reference voltage; and wherein the driver integrated circuit is configured to determine at least one of a normal state, a capacitance abnormal state, a disconnection state, and a short circuit state of the haptic vibration device based on a combination of the output capacitance determination signal and the disconnection determination signal.

[0034] In addition, the diagnostic unit is configured to measure the capacitance judgment time, which is the time until a signal is output from the capacitance judgment signal output unit, and to calculate the capacitance of the haptic vibration device based on the measured capacitance judgment time, the amount of current applied from the diagnostic current supply unit, and the capacitance reference voltage.

[0035] In addition, the capacitance detection node and the open circuit detection node are configured to output the capacitance determination signal and the open circuit determination signal by sampling the voltage detected through an ADC (Analog-to-Digital Converter).

[0036] In addition, the above reference voltage includes a capacitance reference voltage provided to the capacitance determination signal output unit and a disconnection reference voltage provided to the disconnection determination signal output unit.

[0037] In addition, the diagnostic unit is configured such that when both the capacitance determination signal and the open circuit determination signal are below a threshold reference voltage, the driver integrated circuit determines that the haptic vibration device is in a short-circuit state.

[0038] In addition, the diagnostic unit is configured such that when the capacitance determination signal is in a state below a threshold reference voltage and the open circuit determination signal is in a state above a threshold reference voltage, the driver integrated circuit determines that the haptic vibration device is in a state above the capacitance.

[0039] In addition, the diagnostic unit is configured such that when the capacitance determination signal is above a threshold reference voltage and the open circuit determination signal is below a threshold reference voltage, the driver integrated circuit determines that the haptic vibration device is in an open circuit state.

[0040] The present invention relates to a diagnostic method by a diagnostic unit of a driver integrated circuit for diagnosing the state of a haptic vibration device, comprising: a step of applying a current for diagnosis to the haptic vibration device by a diagnostic current supply unit of the diagnostic unit; a step of detecting a first terminal voltage of the haptic vibration device through a capacitance detection node of the diagnostic unit; a step of detecting a second terminal voltage of the haptic vibration device through a wire break detection node of the diagnostic unit; a step of outputting a capacitance judgment signal by a capacitance judgment signal output unit of the diagnostic unit comparing the voltage detected through the capacitance detection node with a capacitance reference voltage; a step of outputting a wire break judgment signal by a wire break judgment signal output unit of the diagnostic unit comparing the voltage detected through the wire break detection node with a wire break reference voltage; and a diagnostic step in which the diagnostic unit diagnoses at least one of a normal state, a capacitance abnormal state, a wire break state, and a short circuit state of the haptic vibration device based on a combination of the output capacitance judgment signal and the wire break judgment signal.

[0041] Additionally, the diagnostic step further includes: a step in which the diagnostic unit measures a capacitance judgment time, which is the time until a capacitance judgment signal is output from the capacitance judgment signal output unit; and a step in which the diagnostic unit calculates the capacitance of the haptic vibration device based on the measured capacitance judgment time, the amount of current applied from the diagnostic current supply unit, and the capacitance reference voltage.

[0042] Additionally, the diagnostic step further comprises: a step in which the diagnostic unit samples the voltages of the capacitance detection node and the open circuit detection node using an ADC (Analog-to-Digital Converter); a step in which the capacitance determination signal output unit outputs the capacitance determination signal based on the sampled voltages of the capacitance detection node and the open circuit detection node; and a step in which the open circuit determination signal output unit outputs the open circuit determination signal based on the sampled voltages of the capacitance detection node and the open circuit detection node.

[0043] In addition, the diagnostic step further includes a step in which, when both the capacitance determination signal and the open circuit determination signal are in a state below a threshold reference voltage, the diagnostic unit determines that the haptic vibration device is in a short-circuit state.

[0044] Additionally, the diagnostic step further includes a step in which, when the capacitance determination signal is in a state below a threshold reference voltage and the open circuit determination signal is in a state above a threshold reference voltage, the diagnostic unit determines that the haptic vibration device is in a state of capacitance abnormality.

[0045] In addition, the diagnostic step further includes a step in which, when the capacitance determination signal is in a state above a threshold reference voltage and the disconnection determination signal is in a state below a threshold reference voltage, the diagnostic unit determines that the haptic vibration device is in a disconnection state.

[0046] In addition, a driver integrated circuit for diagnosing the state of a haptic vibration device comprises: a diagnostic unit; wherein the diagnostic unit comprises: a diagnostic current supply unit configured to apply current to the haptic vibration device; a capacitance detection node configured to detect a first terminal voltage of the haptic vibration device; a wire break detection node configured to detect a second terminal voltage of the haptic vibration device; a capacitance determination signal output unit configured to output a capacitance determination signal by comparing the voltage of the capacitance detection node with a reference voltage; and a wire break determination signal output unit configured to output a wire break determination signal by comparing the voltage of the wire break detection node with a reference voltage; and wherein the diagnostic unit is configured to determine at least one of a normal state, a capacitance abnormal state, a wire break state, and a short circuit state of the haptic vibration device based on a combination of the output capacitance determination signal and the wire break determination signal.

[0047] In addition, the diagnostic unit is configured to measure the capacitance judgment time, which is the time until a signal is output from the capacitance judgment signal output unit, and to calculate the capacitance of the haptic vibration device based on the measured capacitance judgment time, the amount of current applied from the diagnostic current supply unit, and the capacitance reference voltage.

[0048] In addition, the capacitance detection node and the open circuit detection node are configured to sample the detected voltage and output the capacitance determination signal and the open circuit determination signal.

[0049] In addition, the above reference voltage includes a capacitance reference voltage provided to the capacitance determination signal output unit and a disconnection reference voltage provided to the disconnection determination signal output unit.

[0050] In addition, the diagnostic unit is configured such that when both the capacitance determination signal and the open circuit determination signal are below a threshold reference voltage, the driver integrated circuit determines that the haptic vibration device is in a short-circuit state.

[0051] In addition, the diagnostic unit is configured such that when the capacitance determination signal is in a state below a threshold reference voltage and the open circuit determination signal is in a state above a threshold reference voltage, the driver integrated circuit determines that the haptic vibration device is in a state above the capacitance.

[0052] In addition, the diagnostic unit is configured such that when the capacitance determination signal is above a threshold reference voltage and the open circuit determination signal is below a threshold reference voltage, the driver integrated circuit determines that the haptic vibration device is in an open circuit state.

[0053] The present invention can provide the effect of adjusting the output voltage of a boost converter in real time to match the driving conditions of a haptic vibration device through an Adaptive Control mechanism.

[0054] The present invention can reduce unnecessary power consumption by outputting only the minimum required voltage and provide the effect of increasing energy efficiency in battery-based systems.

[0055] The present invention can provide a power saving effect compared to conventional technology.

[0056] The present invention can provide the effect of generating high-voltage signals of OUT_P and OUT_N by utilizing a differential amplifier to precisely amplify input signals (IN_P, IN_N).

[0057] The present invention can provide the effect of flexibly adapting to various environments and requirements by optimizing the operation of the boost converter and differential amplifier in real time even when driving conditions change.

[0058] The present invention can provide the effect of reducing the size of a power supply system by reducing unnecessary power consumption and generating only the minimum necessary voltage.

[0059] The present invention can provide effects that contribute to the miniaturization and lightweighting of mobile devices, wearable devices, etc., that include a haptic vibration device.

[0060] The present invention can provide the effect of reducing battery consumption and extending battery life in battery-based systems by optimizing power consumption.

[0061] The present invention includes a diagnostic circuit within a driver integrated circuit, thereby enabling autonomous determination of the capacitance, open circuit, or short circuit of a haptic vibration device without the need for separate external measuring equipment. Accordingly, it can provide the effects of simplifying the system configuration and reducing diagnostic costs.

[0062] The present invention can provide the effect of preventing overload of the power supply unit in advance by measuring the capacitance of the piezo actuator before driving and determining whether there is an abnormality.

[0063] The present invention can detect when a disconnection occurs between a vibration device and a driver integrated circuit and block a vibration output command or generate a warning.

[0064] The present invention can provide the effect of preventing physical damage to a driver integrated circuit by detecting an overcurrent condition early in the event of a short circuit in a haptic vibration device and limiting or blocking the operation of the driver circuit.

[0065] FIG. 1a is a boost converter diagram illustrating a conventional structure of a haptic vibration system according to the present invention.

[0066] FIG. 1b is a differential amplifier diagram illustrating the conventional structure of a haptic vibration device according to the present invention.

[0067] FIG. 2 is a diagram illustrating the operating principle according to the conventional structure of a haptic vibration device according to the present invention.

[0068] FIG. 3 is a diagram illustrating a driving method of a haptic vibration system according to an embodiment of the present invention.

[0069] FIG. 4 is a diagram for comparing the output voltage of a boost converter of a conventional structure and a proposed structure according to one embodiment of the present invention.

[0070] Figure 5 shows a mathematical formula for explaining the relationship between the output voltage determination ratio and the amplification ratio according to one embodiment of the present invention.

[0071] FIG. 6 is a diagram showing the case where the haptic driving device (100) is driven at a frequency of 200Hz with a voltage of 100Vpp, and the capacitance load of the haptic driving device (100) is 3uF.

[0072] FIG. 7a is a diagram illustrating the driving method of a haptic vibration device of a conventional haptic vibration system.

[0073] FIG. 7b is a diagram illustrating a driving method of a haptic vibration device of a haptic vibration system according to the present invention.

[0074] FIG. 8 is a diagram showing the configuration of a diagnostic circuit for determining the capacitance and connection status of a haptic vibration device according to one embodiment of the present invention.

[0075] FIG. 9a is a diagram illustrating the signal flow while the diagnostic function of a haptic vibration device according to one embodiment of the present invention is performed.

[0076] FIG. 9b is a diagram illustrating the process of numerically calculating the capacitance of a haptic vibration device by measuring the rate of rise of the detection voltage within a certain time after the application of a constant current, according to the present invention.

[0077] FIG. 10 is a diagram illustrating the process of a diagnostic unit detecting a disconnection in a haptic vibration device (1001) according to the present invention and generating a judgment signal through a capacitance judgment signal output unit and a disconnection judgment signal output unit.

[0078] FIG. 11 is a diagram illustrating the process of detecting and determining a short circuit through a diagnostic unit when a short circuit occurs in a haptic vibration device according to the present invention.

[0079] FIG. 12 is a diagram illustrating a case where the capacitance of a haptic vibration device according to one embodiment of the present invention is abnormally increased.

[0080] Specific details of the embodiments are included in the detailed description and drawings.

[0081] The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims. Throughout the specification, the same reference numerals refer to the same components.

[0082] FIG. 1a is a drawing illustrating a conventional structure of a haptic vibration system according to the present invention. FIG. 1b is a drawing illustrating a conventional structure of a haptic vibration device according to the present invention.

[0083] As illustrated in FIG. 1a(a) and FIG. 1b, a conventional haptic vibration system (200) comprises a haptic vibration device (100), a boost converter (10), and a differential amplifier (20). Here, the boost converter (10) provides an output voltage (13, V) required to drive the conventional haptic vibration device (100). BST It may be a circuit that generates ). The reference voltage (11) shown in (a) of FIG. 1a is a reference voltage input, and the output voltage of the boost converter (10) can be set accordingly. Additionally, the reference voltage (11) can be manually set by a user and can be fixed at the maximum driving voltage. Here, the maximum driving voltage can be determined based on the design or specifications of the haptic vibration device (100). That is, since the maximum driving voltage can mean the maximum voltage limit at which the haptic vibration device (100) can vibrate the most, it can mean the upper limit of the voltage that the boost converter (10) can output.

[0084] Specifically, the haptic vibration device (100) may be made of a piezoelectric material such as PZT or ceramic, and the piezoelectric material may be a material that utilizes the piezoelectric effect, which converts electrical signals into mechanical deformation such as vibration or movement, or conversely, converts mechanical deformation into electrical signals. At this time, since the piezoelectric material can cause deformation such as expansion or contraction when voltage is applied, the required voltage may vary depending on the physical properties of the piezoelectric material. In addition, the required voltage may vary depending on the field of application in which the haptic vibration device (100) is used. For example, in haptic feedback of a smartphone, a low voltage of generally 50 Vpp or more and 100 Vpp or less is required, but in industrial equipment requiring stronger tactile feedback, a voltage of 200 Vpp or more may be required.

[0085] As illustrated in (b) of FIG. 1a, the output voltage determining ratio (12), which represents the Feedback Ratio, can be expressed as RF2 / RF1. Specifically, the output voltage determining ratio (12) is a ratio that determines the output voltage (13, VBST) of the boost converter (10), and the user or designer can adjust the voltage level by changing it. Additionally, the output voltage (13, VBST) can maintain a high voltage based on the maximum driving voltage, and a constant fixed voltage can be output regardless of the driving voltage or frequency of the conventional haptic vibration device (100). At this time, although the driving waveform or required voltage of the haptic vibration device (100) changes over time, the conventional boost converter (10) maintains the maximum driving voltage, which causes a problem of consuming unnecessarily high power. Furthermore, the haptic vibration device (100) has a high capacitance of tens of nF to several μF, and the larger the capacitance, the more power is consumed in the boost converter (10) that outputs a high voltage. That is, the conventional haptic vibration device (100) has a problem in that power consumption increases inefficiently as the driving voltage and frequency increase and as the load capacitance increases.

[0086] As illustrated in FIG. 1b, a conventional haptic vibration system (200) includes a haptic vibration device (100), a boost converter (10), and a differential amplifier (20). Specifically, a waveform generator (21) can perform the role of generating a sin waveform. At this time, the input signals (21-1, 21-2) of IN_N and IN_P generated by the waveform generator (21) can be transmitted to the haptic vibration device (100) through the differential amplifier (20).

[0087] As described, the differential amplifier (20) can amplify the input signals (21-1, 21-2) of IN_N and IN_P generated by the waveform generator (21) and convert them into voltage output signals (21-3, 21-4) of OUT_P and OUT_N capable of driving the haptic vibration device (100). Additionally, the amplification ratio (21-5) is determined by resistors R2 and R1 (21-6), and the GAIN value, which is the amplification ratio (21-5), can be set to R2 / R1. At this time, the output voltage (13, V) generated by the boost converter (10) BST ) is used as the power source for the differential amplifier (20). Accordingly, the haptic vibration device (100) receives the voltage output signals (21-3, 21-4) of the OUT_P and OUT_N of the differential amplifier (20) and can generate vibrations of expansion or contraction according to the voltage. Consequently, the final driving voltage (21-7) of the haptic vibration device (100) can be generated as the difference between the OUT_P voltage output signal (21-3) and the OUT_N voltage output signal (21-4). Specifically, the final driving voltage (21-7) is configured to be directly input to the haptic vibration device (100) to generate vibrations.

[0088] That is, the conventional structure is the output voltage (13, V) of the boost converter (10). BST ) was determined by the output voltage determining ratio (12), which is simply the value of RF2 (12-2) divided by RF1 (12-1). However, since the output voltage determining ratio (12) was designed to be a fixed value, the output voltage (13, V) BST ) could not change dynamically according to driving conditions such as the amplitude or frequency of the waveform.

[0089] FIG. 2 is a diagram illustrating the operating principle according to the conventional structure of a haptic vibration device according to the present invention.

[0090] As illustrated in FIG. 2(a), the boost converter (10) can maintain a fixed boost converter output voltage (2-1) set based on the maximum driving voltage of the haptic vibration device (100). Additionally, the fixed boost converter output voltage (2-1) generated by the boost converter (10) is used as the power source for the differential amplifier (20) to supply the power required to drive the haptic vibration device (100). The voltage output signals (21-3, 21-4) of the outputs OUT_P and OUT_N of the differential amplifier (20) are transmitted to the haptic vibration device (100) to generate a haptic driving waveform. At this time, the OUT_P voltage output signal (21-3) and the OUT_N voltage output signal (21-4) may represent signals with opposite phases to each other.

[0091] As illustrated in FIG. 2(b), the final driving voltage (21-7) of the haptic vibration device (100) is generated by the difference between the OUT_P voltage output signal (21-3) and the OUT_N voltage output signal (21-4). Specifically, the final driving voltage (21-7) is configured to be directly input to the haptic vibration device (100) to generate vibration. At this time, since the haptic vibration device (100) has capacitance characteristics, a charging or discharging current may be generated when the driving voltage changes. Additionally, the haptic vibration device driving current (2-2) may vary depending on the capacitance, frequency, driving voltage, etc. of the haptic vibration device (100). Consequently, the final output power (2-3) of the boost converter may be the product of the fixed boost converter output voltage (2-1), which is set based on the maximum driving voltage of the boost converter (10), and the haptic vibration device driving current (2-2). That is, the final output power (2-3) of the boost converter refers to the energy consumed by the boost converter (100), and accordingly, the user can check the power consumption.

[0092] As described, the boost converter (10) of the conventional haptic vibration system (200) always maintains a fixed boost converter output voltage (2-1) set based on the maximum driving voltage of the boost converter (10), thereby generating a voltage higher than necessary and causing unnecessary power consumption. Therefore, if the output voltage (2-1) is dynamically adjusted to the driving conditions, power consumption higher than necessary can be reduced.

[0093] FIG. 3 is a diagram illustrating a driving method of a haptic vibration system according to an embodiment of the present invention.

[0094] As illustrated in FIG. 3, the boost converter (10) according to the present invention, rather than the conventional fixed output voltage method, outputs an output voltage (13, V) according to the driving conditions of the voltage and frequency of the haptic vibration device (100). BST ) can be dynamically adjusted. Specifically, the voltage required by the haptic vibration device (100) may vary depending on the driving conditions. For example, the haptic vibration device (100) may require a low voltage when low-intensity vibration is required, and a high voltage when high-intensity vibration is required. That is, the boost converter (10) of the present invention may require an output voltage (13, V) according to such requirements. BST By dynamically adjusting ) it is possible to provide only the power required for the haptic vibration device (100) and provide the effect of reducing unnecessary power consumption.

[0095] FIG. 4 is a diagram for comparing the output voltage of a boost converter of a conventional structure and a proposed structure according to one embodiment of the present invention.

[0096] As shown in FIG. 4(a), the output voltage (13, V) of the boost converter (10) of the conventional structure and the proposed structure in the x-axis time y-axis voltage graph. BST) can be compared. First, it can be seen that in the conventional structure, the output voltage (2-1-1) of the boost converter (10) is fixed. That is, it can be seen that the output voltage (2-1-1) of the boost converter (10) in the conventional structure is maintained at a constant level in accordance with the maximum driving voltage. As mentioned above, this can lead to unnecessary power consumption because it outputs a high voltage even when a low-amplitude driving waveform is required.

[0097] As described, the output voltage (2-1-2) of the boost converter of the proposed structure can be adjusted in real time based on the conditions of the driving waveform, such as amplitude or frequency, for the output voltage (13, VBST) of the boost converter (10) based on an Adaptive Control mechanism. That is, the boost converter (10) of the proposed structure can lower the output voltage for low-amplitude driving waveforms and raise the output voltage for high-amplitude driving waveforms. In addition, the voltage output signals (21-3, 21-4) of OUT_P and OUT_N of the differential amplifier (20) can be efficiently generated according to the adjusted output voltage of the boost converter (10). Accordingly, the present invention can provide the effect of reducing unnecessary power consumption.

[0098] As illustrated in FIG. 4(b), the final driving voltage (21-7) of the haptic vibration device (100) can be generated by the difference between the OUT_P voltage output signal (21-3) and the OUT_N voltage output signal (21-4). This confirms that even if the output voltage (2-1-1) of the conventional structure boost converter (10) and the output voltage (2-1-2) of the proposed structure boost converter are different, the final driving voltage (21-7) appears the same in both the conventional structure and the proposed structure. In other words, it can be confirmed that the amplitude and frequency are determined according to the waveform required by the haptic vibration device (100).

[0099] As described, the driving current (2-2) is determined based on the characteristics of the haptic vibration device (100) or the final driving voltage (21-7). Although the shape of the driving current (2-2) is similar in both the conventional structure and the proposed structure, it can be seen that the current consumption is reduced because the output voltage (2-1-2) of the boost converter (10) of the proposed structure is lowered.

[0100] As described above, the output voltage (2-1-1) of the conventional boost converter (10) can be seen to have a constant waveform and high power consumption because the boost converter (10) always outputs a fixed high voltage. However, the output voltage (2-1-2) of the boost converter (10) of the proposed structure is adjusted by an Adaptive Control mechanism so that the output voltage of the boost converter (10) matches the driving waveform of the final driving voltage (21-7). Therefore, compared to the conventional structure, the proposed structure provides the effect of saving output power.

[0101] Figure 5 shows a mathematical formula for explaining the relationship between the output voltage determination ratio and the amplification ratio according to one embodiment of the present invention.

[0102] As described above, the conventional structure has an output voltage (13, V) of the boost converter (10). BST ) was determined by the output voltage determining ratio (12), which is simply the value of RF2 (12-2) divided by RF1 (12-1). However, since the output voltage determining ratio (12) was designed to be a fixed value, the output voltage (13, V) BST ) could not change dynamically according to driving conditions such as the amplitude or frequency of the waveform.

[0103] According to one embodiment of the present invention, the boost converter (10) has an output voltage (13, V BST It generates ). Specifically, the output voltage (13, V) generated by the boost converter (10). BST) is generated based on the output voltage determination ratio (12). The amplification ratio (21-5, GAIN) shown in the equation of FIG. 5 (c) is represented as the value obtained by dividing the second resistor (21-6-2) by the first resistor (21-6-1). Additionally, the differential amplifier (20) is generated based on the output voltage (13, V) of the boost converter (10). BST Based on ), the input signals of IN_N and IN_P (21-1, 21-2, V IN Amplifying ) to obtain the final output signals, the voltage output signals OUT_P and OUT_N (21-3, 21-4, V OUT Can generate ).

[0104] According to one embodiment of the present invention, the amplification ratio (21-5, GAIN) is the voltage output signals (21-3, 21-4, V) of OUT_P and OUT_N, which are the final output signals of the differential amplifier (20). OUT It can perform the role of determining ). That is, the differential amplifier (20) can determine the input signals (21-1, 21-2, V) of IN_N and IN_P. IN ) can be amplified by an amplification ratio (21-5, GAIN) to generate a driving waveform to be transmitted to the haptic vibration device (100). Here, the amplification ratio (21-5, GAIN) of the differential amplifier (20) can be coupled with the output voltage determination ratio (12, 1+GAIN) of the boost converter (10). That is, the differential amplifier (20) is coupled with the output voltage (13, V) of the boost converter (10). BST It can perform adjustments of ).

[0105] According to one embodiment of the present invention, a reference voltage generator (30) can calculate the range of voltage required for a boost converter (10) by analyzing a driving waveform, such as amplitude or frequency, of a haptic vibration device (100). Specifically, the reference voltage generator (30) can perform the role of analyzing the characteristics of a driving waveform, such as amplitude or frequency, required by the haptic vibration device (100) in real time. That is, if the amplitude of the final driving voltage (21-7) generated by the haptic vibration device (100) is low, the reference voltage generator (30) can perform an analysis that the haptic vibration device (100) requires a low voltage. Conversely, if the amplitude of the final driving voltage (21-7) generated by the haptic vibration device (100) is large, the reference voltage generator (30) can perform an analysis that the haptic vibration device (100) requires a high voltage. Accordingly, the reference voltage generator (30) can generate a reference voltage (11) by calculating the range of output voltage required according to the driving conditions of the haptic vibration device (100).

[0106] According to one embodiment of the present invention, the reference voltage (11) is the output voltage (13, V) of the boost converter (10). BST It can be used as a reference value for setting ). Specifically, the boost converter (10) adjusts the output voltage determination ratio (12) based on the reference voltage (11) provided by the reference voltage generator (30) to set the output voltage (13, V). BST It can generate ). At this time, the output voltage (13, V BST ) can be determined by the mathematical formula (a) of FIG. 5, and the boost converter (10) can generate only the voltage required by the haptic vibration device (100). For example, if low-intensity vibration is required, the boost converter (10) can generate an output voltage (13, V BST ) can be set low. That is, the present invention can provide the effect of preventing unnecessary power consumption.

[0107] FIG. 6 is a diagram showing the case where the haptic driving device (100) is driven at a frequency of 200Hz with a voltage of 100Vpp, and the capacitance load of the haptic driving device (100) is 3uF.

[0108] As shown in FIG. 6(a), in the x-axis time y-axis voltage graph, the output voltage (6-1) of the boost converter (10) represents the output voltage of the boost converter (10) in fixed output mode. At this time, the output voltage (6-1) of the boost converter (10) represents a fixed maximum voltage of 52V. Additionally, the output voltage (6-2) of the boost converter (10) in Adaptive Control mode indicates that in Adaptive Control, the output voltage of the boost converter (10) is adjusted in real time according to driving conditions such as the amplitude of the waveform of the haptic vibration device (100) or the waiting time. Furthermore, OUT_P (6-3) and OUT_N (6-4) represent the output signals of the differential amplifier (20), and it can be seen that the signals of OUT_P (6-3) and OUT_N (6-4) change symmetrically according to the driving conditions.

[0109] As shown in FIG. 6(b), in the x-axis time and y-axis voltage graph, the driving voltage is 100 Vpp, confirming that the final driving voltage applied to the haptic vibration device (100) is 100 Vpp. This can be expressed as the difference between the OUT_P voltage output signal (21-3) and the OUT_N voltage output signal (21-4) generated by the differential amplifier (20). That is, the final driving voltage (21-7) can be confirmed by the illustrated differential output (6-5), and it can be confirmed that both Adaptive Control and Fixed Output generate the same driving voltage. Here, the wait time is 1.5 ms, representing the interval during which the driving voltage is maintained for a constant period. The wait time of 1.5 ms is an exemplary value and can be adjusted according to the control system of the boost converter (10) or the output of the boost converter (10).

[0110] As shown in FIG. 6(c), in the x-axis time y-axis current graph, the actuator current (6-6) is the current flowing through the haptic vibration device (100), and can be determined according to characteristics such as the driving voltage and the capacitance of the haptic vibration device (100). As shown, the shape of the driving current is the same for both Adaptive Control and Fixed Output. However, in the Adaptive Control of the present invention, the output voltage of the boost converter (10) is dynamically controlled according to the driving waveform, thereby providing the effect of reducing power consumption.

[0111] As shown in FIG. 6(d), in the x-axis time y-axis power graph, power (6-7) in Fixed Output mode indicates that more power than necessary is wasted because the boost converter (10) always outputs the maximum voltage in Fixed Output mode. On the other hand, power (6-8) in Adaptive Control mode indicates that unnecessary power consumption is reduced because the boost converter (10) generates only the necessary power in Adaptive Control mode, thereby reducing the output power. Therefore, according to one embodiment of the present invention, it can be confirmed that an output power saving effect occurs in Adaptive Control compared to Fixed Output.

[0112] In summary, in the Fixed Output method, the boost converter (10) always outputs a fixed voltage at the maximum output voltage, but in the Adaptive Control according to the present invention, the output voltage is changed according to the driving waveform to provide the effect of increasing efficiency. In addition, the present invention can reduce output power through the introduction of Adaptive Control, thereby providing the effect of extending battery life in battery-based devices. Furthermore, since the present invention provides the same driving voltage as the Fixed Output even in the Adaptive Control mode, it can provide the effect of not affecting the performance of the haptic vibration device (100).

[0113] The present invention may provide a method for driving an Adaptive Control-based Piezo haptic vibration device (100). Specifically, the method for driving an Adaptive Control-based Piezo haptic vibration device (100) according to the present invention may include a reference voltage (11) generation step for generating a reference voltage based on driving conditions of the haptic vibration device (100), an output voltage generation step for generating an output voltage based on the generated reference voltage (11) and an output voltage determination ratio (12), an input signal amplification step for receiving the output voltage as input and amplifying the received input signal, a driving signal generation step for generating a driving signal based on the amplified input signal, and an operation step for operating by the generated driving signal. At this time, the output voltage generation step may further include a step of determining the output voltage determination ratio (12) based on the amplification ratio in which the input signal is amplified in the input signal amplification step.

[0114] According to one embodiment of the present invention, the output voltage generation step may further include the step of generating an output voltage (13) based on an output voltage determination ratio (12) defined based on a first resistance and a second resistance of a boost converter (10) of a haptic vibration device (100). Additionally, the input signal amplification step may further include the step of amplifying an input signal received based on an amplification ratio defined based on a first resistance and a second resistance of a differential amplifier (20) of a haptic vibration device (100).

[0115] According to one embodiment of the present invention, the reference voltage generation step may further include the step of generating the reference voltage based on at least one of the amplitude and frequency of the haptic vibration device (100). Additionally, the driving signal generation step may further include the step of generating a driving signal by amplifying an input signal using a differential amplifier (20) of the haptic vibration device (100). Additionally, the operation step performed by the generated driving signal may further include the step of the generated driving signal serving as the basis for the driving waveform of the haptic vibration device (100).

[0116] FIG. 7a is a diagram illustrating the driving method of a haptic vibration device of a conventional haptic vibration system. The haptic vibration system (101) according to the present invention includes a haptic vibration device (1001). Specifically, the haptic vibration device (1001) of the present invention may refer to a piezo haptic actuator.

[0117] As described above, the conventional haptic vibration system (101) is a method in which a control command from a control unit (2001) is transmitted to a driver integrated circuit (3001) through an interface unit (2101), and a communication unit (3101) and a processing unit (3201) within the driver integrated circuit (3001) analyze the control command. Accordingly, the conventional haptic vibration system (101) drives an externally connected haptic vibration device (1001) by controlling a driving unit (3301) based on the analyzed control command.

[0118] However, the conventional haptic vibration system (101) illustrated in FIG. 7a has the problem that it is impossible to diagnose the condition of the haptic vibration device (1001). That is, since the driver integrated circuit (3001) cannot detect in real time whether there is a defect in the haptic vibration device (1001), deformation of the internal structure, open circuit, or short circuit, various problems may occur.

[0119] Specifically, if the haptic vibration device (1001) is deformed due to external shock or thermal and mechanical stress, the internal capacitance increases, and consequently, more current is required during operation. This increase in current causes an excessive load on the power supply unit, which can impair the stability of the entire system. Additionally, if an open circuit occurs in the connection line between the haptic vibration device (1001) and the driver integrated circuit (3001), the driving signal generated by the driver integrated circuit (3001) is not transmitted to the haptic vibration device (1001), so the haptic feedback desired by the user cannot be generated. Furthermore, if a short circuit occurs in the haptic vibration device (1001) or its connection line, an excessive current flows through the driving unit (3301) of the driver integrated circuit (3001), which may cause damage to the driving circuit or system malfunction.

[0120] As such, the conventional haptic vibration system (101) has a problem in that it lacks the ability to determine the connection status and capacitance change of the haptic vibration device (1001), which can cause not only device malfunction but also damage to the driver integrated circuit (3001).

[0121] FIG. 7b is a diagram illustrating a driving method of a haptic vibration device of a haptic vibration system according to the present invention. The haptic vibration system (101) according to the present invention includes a haptic vibration device (1001). Specifically, the haptic vibration device (1001) of the present invention may refer to a piezo haptic actuator.

[0122] The haptic vibration system (101) according to the present invention further includes a diagnostic unit (4001) to internally diagnose the state of the haptic vibration device (1001). Specifically, the diagnostic unit (4001) is included within a driver integrated circuit (3001) and is configured to determine whether the vibration device is normal by applying a constant current to the haptic vibration device (1001) and calculating the capacitance using the amount of voltage change and time information corresponding thereto.

[0123] According to the present invention, the diagnostic unit (4001) includes a diagnostic current supply unit (4201) and applies a constant current to one terminal of the haptic vibration device (1001). At this time, the diagnostic current supply unit (4201) stably supplies a fixed current during the diagnostic period using a constant current source, and the voltage across the haptic vibration device (1001) increases over time. The rate of increase in voltage depends on the capacitance (C) and can be defined by [Equation 1].

[0124] [Formula 1]

[0125]

[0126] Here, C represents the capacitance of the haptic vibration device (1001), I represents a constant current applied from the diagnostic current supply unit (4201), Δt represents the time taken for the voltage to rise, and ΔV represents the amount of change in voltage.

[0127] According to the present invention, the diagnostic unit (4001) can determine whether there is an abnormality in the capacitance by calculating the capacitance of the haptic vibration device (1001) based on [Equation 1] and comparing it with a reference range. Additionally, if the voltage does not change for a certain period of time or is below the reference, it can be determined as an open circuit state, and if the current flow is excessively large, it can be determined as a short circuit state. Accordingly, the haptic vibration system (101) of the present invention can internally determine the capacitance, open circuit, and short circuit states of the haptic vibration device (1001) without separate external equipment, so the configuration of the haptic vibration system (101) is simplified and diagnostic costs are reduced.

[0128] In addition, the haptic vibration system (101) of the present invention can detect in advance the deformation state of the haptic vibration device (1001) caused by external shock or environmental changes, thereby protecting the power supply unit and the driver integrated circuit (3001) in advance. In addition, the haptic vibration system (101) of the present invention can prevent damage to the driver integrated circuit (3001) by controlling or blocking the output of the driving unit (3301) in the event of a disconnection or short circuit.

[0129] FIG. 8 is a diagram showing the configuration of a diagnostic circuit for determining the capacitance and connection status of a haptic vibration device according to one embodiment of the present invention.

[0130] As described above, the diagnostic unit (4001) includes a current supply unit (4101) for supplying current to one terminal of the haptic vibration device (1001) and a diagnostic current supply unit (4201) for applying a constant current during the diagnostic period. When the diagnosis is initiated, the diagnostic current supply unit (4201) applies a current of a constant magnitude to the haptic vibration device (1001), thereby generating a voltage at both ends of the haptic vibration device (1001). Accordingly, a voltage rise due to the current occurs at the capacitance detection node (4301) connected to the top of the haptic vibration device (1001), and a voltage at a reference voltage level is formed at the disconnection detection node (4401) connected to the bottom. The voltage generated at the capacitance detection node (4301) and the voltage generated at the disconnection detection node (4401) are compared with the capacitance reference voltage (4501) and the disconnection reference voltage (4601), respectively.

[0131] In other words, the capacitance sensing node (4301) can detect the first terminal voltage of the haptic vibration device (1001). Additionally, the disconnection sensing node (4401) can detect the second terminal voltage of the haptic vibration device (1001). Here, the first terminal voltage is a voltage applied to the upper terminal of the haptic vibration device (1001), which is a potential that rises due to the current applied through the diagnostic current supply unit (4201), and the second terminal voltage is a voltage measured at the lower terminal of the haptic vibration device (1001), which corresponds to a reference potential (GND) or a potential close to it.

[0132] According to the present invention, in order to determine whether the voltage generated at the capacitance sensing node (4301) reaches the capacitance reference voltage (4501), the diagnostic unit (4001) includes a capacitance determination signal output unit (4701) in the form of a comparator. Specifically, the capacitance determination signal output unit (4701) outputs a High signal at the point when the voltage of the sensing node exceeds the reference voltage, and the capacitance of the haptic vibration device (1001) can be calculated by measuring the time information up to that point. The capacitance is calculated according to the aforementioned [Equation 1]:

[0133] Meanwhile, the disconnection status of the haptic vibration device (1001) can be determined through a disconnection determination signal output unit (4801) that compares whether the voltage of the disconnection detection node (4401) is lower than the disconnection reference voltage (4601). In the case of a disconnection, the circuit is open and no current flows, so no voltage is formed at the disconnection detection node (4401), and as a result, the output unit (4801) outputs a disconnection determination signal.

[0134] Accordingly, the diagnostic unit (4001) can precisely diagnose the condition of the haptic vibration device (1001) through a series of procedures including applying a constant current → measuring the voltage of the sensing node → comparing with a reference voltage → outputting a signal and measuring time. This method can be configured with a simple structure, and the haptic vibration system (101) of the present invention can determine whether there is an abnormal capacitance, open circuit, or short circuit using only internal circuits without external devices.

[0135] FIG. 9a is a diagram illustrating the signal flow while the diagnostic function of a haptic vibration device according to one embodiment of the present invention is performed.

[0136] As described above, when the operation start signal (4211) switches to a High level, the diagnostic current supply unit (4201) begins to apply a constant diagnostic current to one terminal of the haptic vibration device (1001). At this time, the diagnostic current charges the capacitance of the haptic vibration device (1001), and accordingly, the voltage across the terminals gradually increases.

[0137] As described, the upper voltage of the haptic vibration device (1001) is measured through the capacitance sensing node (4301), and the upper voltage rises over time to reach the capacitance reference voltage (4501). When the upper voltage reaches the capacitance reference voltage (4501), the capacitance judgment signal output unit (4701) switches from a state below the threshold reference voltage to a state above the threshold reference voltage, and the time taken until the switching point of the capacitance judgment signal output unit (4701) is defined as the capacitance judgment time (4711).

[0138] Additionally, the lower voltage of the haptic vibration device (1001) is measured through the disconnection detection node (4401), and when the lower voltage is maintained at a state above the disconnection reference voltage (4601), the disconnection judgment signal output unit (4801) maintains a Low value.

[0139] FIG. 9b is a diagram illustrating the process of numerically calculating the capacitance of a haptic vibration device by measuring the rate of rise of the detection voltage within a certain time after the application of a constant current, according to the present invention.

[0140] As described above, the haptic vibration system (101) of the present invention can diagnose that the haptic vibration device (1001) of the present invention is not disconnected by a diagnostic start step (S1001) in which an operation start signal (4211) is switched to High, a voltage rise step (S1101) of a capacitance detection node (4301) due to the application of a constant current, a High switching step (S1201) of a capacitance judgment signal output unit (4701) when the detection voltage reaches a capacitance reference voltage (4501), and a step (S1301) in which the voltage of a disconnection detection node (4401) is maintained above a disconnection reference voltage (4601) so that a disconnection judgment signal output unit (4801) maintains a Low value.

[0141] According to one embodiment of the present invention, the diagnostic unit (4001) can numerically calculate the capacitance of the haptic vibration device (1001) by measuring the rate of rise of the detection voltage within a certain time after applying a constant current, and simultaneously diagnose whether there is a disconnection in parallel. In this embodiment, since the capacitance judgment time (4711) is within the normal range, it can be determined that the haptic vibration device (1001) is connected normally and is in a normal state.

[0142] FIG. 10 is a diagram illustrating the process of a diagnostic unit detecting a disconnection in a haptic vibration device (1001) according to the present invention and generating a judgment signal through a capacitance judgment signal output unit and a disconnection judgment signal output unit.

[0143] According to the present invention, when a diagnostic operation of the haptic vibration system (101) is initiated, the operation start signal (4211) is switched to a High level under the control of the control unit (2001) or the internal processing unit (3201), and in response to this, the diagnostic current supply unit (4201) attempts to apply a constant current to one terminal of the haptic vibration device (1001). However, in this embodiment, since a disconnection occurs in the connection line between the haptic vibration device (1001) and the driver integrated circuit (3001), the circuit is open and the current does not flow without forming a closed circuit.

[0144] In this disconnected state, even though the internal capacitance of the haptic vibration device (1001) is not charged, the capacitance sensing node (4301) is connected to the external current supply unit (4101), so the voltage rises relatively quickly along the high-impedance path. As a result, the voltage of the capacitance sensing node (4301) exceeds the capacitance reference voltage (4501) within a short period of time, and accordingly, the capacitance judgment signal output unit (4701) outputs a High level judgment signal at that time.

[0145] On the other hand, the disconnection detection node (4401) connected to the bottom of the haptic vibration device (1001) has a broken circuit, so the potential difference with the reference voltage is not maintained, and in reality, it is fixed in a ground (GND) state. As a result, the voltage of the disconnection detection node (4401) is maintained at a level lower than the disconnection reference voltage (4601), and as a result, the disconnection judgment signal output unit (4801) also outputs a High signal.

[0146] That is, in the case where a disconnection occurs as in the present embodiment, the voltage of the capacitance detection node (4301) rises even though the diagnostic current does not actually flow, and it may be incorrectly judged as an abnormal capacitance, but at the same time, the diagnostic unit (4001) can clearly identify this as a 'disconnection state' through the fact that the voltage of the disconnection detection node (4401) is maintained below the reference.

[0147] This diagnostic method enables the diagnosis of a disconnection state, which cannot be distinguished by the sole judgment of capacitance, without false detection by comprehensively analyzing the voltage comparison results of both nodes, and provides the advantage of quickly identifying the connection status of the haptic vibration device (1001) within the driver integrated circuit (3001) without an external device. As a result, the haptic vibration system (101) of the present invention can prevent unnecessary attempts at vibration driving and prevent device malfunction in advance.

[0148] FIG. 11 is a diagram illustrating the process of detecting and determining a short circuit through a diagnostic unit when a short circuit occurs in a haptic vibration device according to the present invention.

[0149] According to one embodiment of the present invention, when a diagnostic operation is started, an operation start signal (4211) is switched to a High level under the control of a control unit (2001) or an internal processing unit (3201), and in response, a diagnostic current supply unit (4201) applies a constant current to one terminal of a haptic vibration device (1001). Normally, the current applied from the diagnostic current supply unit (4201) charges the internal capacitance of the haptic vibration device (1001) and raises the voltage for a certain period of time, but in this embodiment, there is a state in which a short circuit exists in the internal or external connection path of the haptic vibration device (1001).

[0150] According to one embodiment of the present invention, when a short circuit exists, the two ends of the haptic vibration device (1001) are connected with very low impedance or in a state with almost no conductive resistance, so that the applied diagnostic current flows almost directly to the ground or the opposite power terminal. As a result, charging action as a capacitor does not occur, and a sufficient potential difference is not formed across the two ends of the haptic vibration device (1001). Consequently, the voltage measured at the capacitance detection node (4301) does not reach the capacitance reference voltage (4501) and remains at an intermediate voltage below a certain level. Accordingly, the capacitance judgment signal output unit (4701) does not satisfy the judgment criteria and remains in a state below the threshold reference voltage.

[0151] Meanwhile, the voltage measured at the open circuit detection node (4401) also forms an intermediate voltage of a similarly low level. At this time, the voltage is higher than the open circuit reference voltage (4601), but does not rise sufficiently to stably exceed the reference. As a result, the open circuit judgment signal output unit (4801) also does not satisfy the condition of exceeding the reference voltage, so it maintains a state below the threshold reference voltage.

[0152] That is, when a short circuit occurs as in the present embodiment, an output combination is generated in which both the capacitance judgment signal and the open circuit judgment signal remain below a threshold reference voltage, which is a pattern distinct from other fault types such as normal state, capacitance increase, or open circuit.

[0153] According to the present invention, the diagnostic unit (4001) can clearly determine the short-circuit state of the haptic vibration device (1001) by analyzing such output combinations. The diagnostic unit (4001) can identify the type of fault by logically combining the output results of the two nodes, rather than independently determining the voltages of the capacitance detection node (4301) and the open circuit detection node (4401). In addition, since the short-circuit state is a dangerous state in which overcurrent may flow into the driving unit (3301) or the driver integrated circuit (3001), the diagnostic unit (4001) of the present invention can detect this in advance and block the driving operation or perform a protection operation.

[0154] FIG. 12 is a diagram illustrating a case where the capacitance of a haptic vibration device according to one embodiment of the present invention is abnormally increased.

[0155] As described, if the capacitance of the haptic vibration device (1001) increases abnormally, this can be detected and determined through the diagnostic unit (4001). FIG. 12 is a timing diagram illustrating the temporal flow of voltage and judgment signals in this state, exemplifying a peculiar state in which both capacitance judgment and disconnection judgment fail.

[0156] As described above, when the diagnostic operation starts as the operation start signal (4211) switches to High, the diagnostic current supply unit (4201) applies a constant current to the haptic vibration device (1001). Normally, the voltage across the haptic vibration device (1001) rises within a certain time due to this current, but in this embodiment, the charging speed is significantly slowed because the internal capacitance of the haptic vibration device (1001) is excessively large.

[0157] As a result, the voltage of the capacitance detection node (4301) does not reach the capacitance reference voltage (4501) within the diagnostic section, while at the same time, the voltage of the disconnection detection node (4401) is maintained above a certain level because the constant current flows normally. However, although the voltage of the disconnection detection node (4401) is higher than the disconnection reference voltage (4601), it may not be sufficient to satisfy the diagnostic judgment criteria. Consequently, as shown in FIG. 12, both the capacitance judgment signal output unit (4701) and the disconnection judgment signal output unit (4801) remain in a state below the threshold reference voltage, and the diagnostic unit (4001) can determine, based on this, that the capacitance of the haptic vibration device (1001) has increased significantly beyond a predetermined allowable range. This implies the possibility that the internal structure of the haptic vibration device has been deformed due to external shock or environmental changes, or that its electrical characteristics have changed due to the end of its lifespan.

[0158] In addition, in this embodiment, an abnormality was evaluated based on the capacitance determination time (4711) using a diagnostic method based on a comparator and time measurement, but it is not limited thereto. By directly sampling the voltages of the capacitance detection node (4301) and the open circuit detection node (4401) using an analog-to-digital converter (ADC), the voltage state can be analyzed more precisely, and the numerical value of the capacitance and the open circuit / short circuit status can be detected.

[0159] The scope of the present invention is not limited to the embodiments described above but may be implemented in various forms of embodiments within the scope of the appended claims. It is deemed that the scope of the claims of the present invention includes various modifications that are possible by anyone with ordinary knowledge in the technical field to which the invention pertains, without departing from the essence of the invention claimed in the claims.

[0160] [Explanation of the symbol]

[0161] 2-2: Haptic Vibration Device Driving Current

[0162] 2-3: Boost Converter Final Output Power

[0163] 10: Boost Converter

[0164] 11: Reference voltage

[0165] 12: Output voltage determination ratio

[0166] 13: Output voltage

[0167] 20: Differential amplifier

[0168] 21: Waveform Generator

[0169] 21-5: Amplification Ratio

[0170] 21-7: Final driving voltage

[0171] 30: Reference voltage generator

[0172] 100: Haptic vibration device

[0173] 200: Haptic Vibration System

[0174] 101: Haptic Vibration System

[0175] 1001: Haptic vibration device

[0176] 2001: Control Unit

[0177] 2101: Interface section

[0178] 3001: Driver integrated circuit

[0179] 3101: Communications Department

[0180] 3201: Processing unit

[0181] 3301: Drive unit

[0182] 4001: Diagnostic Unit

[0183] 4101: Current supply unit

[0184] 4201: Diagnostic current supply

[0185] 4211: Operation Initiation Signal

[0186] 4301: Capacitive sensing node

[0187] 4401: Open circuit detection node

[0188] 4501: Capacitance reference voltage

[0189] 4601: Single-line reference voltage

[0190] 4701: Capacitance determination signal output unit

[0191] 4801: Open circuit detection signal output unit

Claims

1. In an Adaptive Control-based haptic vibration system for driving a Piezo haptic vibration device, A reference voltage generator that generates a reference voltage based on the driving conditions of the above-mentioned haptic vibration device; A boost converter that generates an output voltage based on the ratio of the generated reference voltage and output voltage; A differential amplifier that receives the output voltage of the boost converter as input and amplifies the received input signal to generate a driving signal; and A haptic vibration device operated by the above-mentioned generated driving signal; Includes, The above output voltage determination ratio Determined based on the amplification ratio of the above differential amplifier, Adaptive Control-based haptic vibration system for driving a Piezo haptic vibration device.

2. In Paragraph 1, The amplification ratio of the above differential amplifier is, Defined by the first resistance value and the second resistance value of the above differential amplifier, Adaptive Control-based haptic vibration system for driving a Piezo haptic vibration device.

3. In Paragraph 2, The above amplification ratio is, The value obtained by dividing the second resistance value by the first resistance value, Adaptive Control-based haptic vibration system for driving a Piezo haptic vibration device.

4. In Paragraph 1, The above reference voltage generator is, Configured to generate the reference voltage based on the final driving voltage of the above haptic vibration device, Adaptive Control-based haptic vibration system for driving a Piezo haptic vibration device.

5. In Paragraph 1, The above boost converter is, Configured to adjust the output voltage in real time based on the above-mentioned generated reference voltage and output voltage determination ratio, Adaptive Control-based haptic vibration system for driving a Piezo haptic vibration device.

6. In Paragraph 1, The above boost converter is, The device is configured to generate an output voltage below a threshold when at least one of the amplitude of the final driving voltage of the haptic vibration device and the frequency of the final driving voltage is below a threshold, and Configured to generate an output voltage greater than or equal to a threshold when at least one of the amplitude of the final driving voltage of the haptic vibration device and the frequency of the final driving voltage is greater than or equal to a threshold. Adaptive Control-based haptic vibration system for driving a Piezo haptic vibration device.

7. A method for driving an adaptive control-based piezo haptic vibration device, A reference voltage generation step for generating a reference voltage based on the driving conditions of the above-mentioned haptic vibration device; An output voltage generation step for generating an output voltage based on the generated reference voltage and output voltage determination ratio; An input signal amplification step that receives the above output voltage as input and amplifies the received input signal; A driving signal generation step for generating a driving signal based on the amplified input signal; and An operation step operated by the above-mentioned generated driving signal; Includes, The above output voltage generation step; The method further comprises the step of determining the output voltage determination ratio based on the amplification ratio in which the input signal is amplified in the input signal amplification step. Method for driving an Adaptive Control-based Piezo haptic vibration device.

8. In Paragraph 7, The above output voltage generation step; The method further comprises the step of generating the output voltage based on the output voltage determination ratio defined based on the first resistance value and the second resistance value of the boost converter of the haptic vibration device. Method for driving an Adaptive Control-based Piezo haptic vibration device.

9. In Paragraph 7, The above input signal amplification step; The method further comprises the step of amplifying the input signal received based on the amplification ratio defined based on the first resistance value and the second resistance value of the differential amplifier of the haptic vibration device. Method for driving an Adaptive Control-based Piezo haptic vibration device.

10. In Paragraph 7, The above reference voltage generation step; is The method further comprises the step of generating the reference voltage based on at least one of the amplitude and frequency of the haptic vibration device. Method for driving an Adaptive Control-based Piezo haptic vibration device.

11. In a haptic vibration system for diagnosing the condition of a haptic vibration device, Haptic vibration device; and A driver integrated circuit configured to diagnose the state of the above-mentioned haptic vibration device; comprising, The above driver integrated circuit is, Includes a diagnostic unit; and The above diagnostic unit is, A diagnostic current supply unit configured to apply current to the above-mentioned haptic vibration device; A capacitance sensing node configured to detect the first terminal voltage of the above-mentioned haptic vibration device; A disconnection detection node configured to detect the second terminal voltage of the above-mentioned haptic vibration device; A capacitance determination signal output unit configured to output a capacitance determination signal by comparing the voltage of the above-mentioned capacitance sensing node with a reference voltage; A wire breakage determination signal output unit configured to output a wire breakage determination signal by comparing the voltage of the wire breakage detection node with a reference voltage; The above driver integrated circuit is, Based on the combination of the above-mentioned output capacitance determination signal and open circuit determination signal, Configured to determine at least one of the normal state, capacitance abnormal state, open circuit state, and short circuit state of the above-mentioned haptic vibration device, Haptic vibration system for diagnosing the condition of a haptic vibration device.

12. In Paragraph 11, The above diagnostic unit is, The capacitance determination time, which is the time until a signal is output from the above capacitance determination signal output unit, is measured, and Based on the measured capacitance determination time, the amount of current applied from the diagnostic current supply unit, and the capacitance reference voltage, Configured to calculate the capacitance of the above-mentioned haptic vibration device, Haptic vibration system for diagnosing the condition of a haptic vibration device.

13. In Paragraph 11, The above capacitance sensing node and the above disconnection sensing node are, By sampling the voltage detected through the ADC (Analog-to-Digital Converter) Configured to output the above capacitance determination signal and the above open circuit determination signal, Haptic vibration system for diagnosing the condition of a haptic vibration device.

14. In Paragraph 11, The above reference voltage is, A capacitance reference voltage provided to the capacitance determination signal output unit and a disconnection reference voltage provided to the disconnection determination signal output unit, Haptic vibration system for diagnosing the condition of a haptic vibration device.

15. In Paragraph 11, The above diagnostic unit is, When both the above capacitance determination signal and the above open circuit determination signal are in a state below the threshold reference voltage, The above driver integrated circuit is configured to determine that the haptic vibration device is in a short-circuit state, Haptic vibration system for diagnosing the condition of a haptic vibration device.

16. A diagnostic method using a diagnostic unit of a driver integrated circuit for diagnosing the state of a haptic vibration device, wherein A step of applying a current for diagnosis to the haptic vibration device by a diagnostic current supply unit of the diagnostic unit; A step of detecting the first terminal voltage of the above-described haptic vibration device through the capacitance sensing node of the diagnostic unit; A step of detecting the second terminal voltage of the above-mentioned haptic vibration device through the disconnection detection node of the above-mentioned diagnostic unit; A step in which the capacitance judgment signal output unit of the diagnostic unit compares the voltage detected through the capacitance detection node with the capacitance reference voltage and outputs a capacitance judgment signal; A step of outputting a wire breakage determination signal by comparing the voltage detected through the wire breakage detection node with a wire breakage reference voltage by the wire breakage determination signal output unit of the diagnostic unit; and A diagnostic step comprising: a diagnostic unit diagnosing at least one of a normal state, an abnormal capacitance state, an open circuit state, and a short circuit state of the haptic vibration device based on a combination of the above-mentioned output capacitance determination signal and an open circuit determination signal; A diagnostic method for diagnosing the condition of a haptic vibration device.

17. In Paragraph 16, The above diagnostic step; is, A step in which the diagnostic unit measures the capacitance determination time, which is the time until the capacitance determination signal is output from the capacitance determination signal output unit; and The method further comprises the step of the diagnostic unit calculating the capacitance of the haptic vibration device based on the measured capacitance determination time, the amount of current applied from the diagnostic current supply unit, and the capacitance reference voltage. A diagnostic method for diagnosing the condition of a haptic vibration device.

18. In Paragraph 16, The above diagnostic step; is, A step of sampling the voltages of the above-mentioned capacitance sensing node and the above-mentioned open-circuit detection node using the above-mentioned diagnostic unit ADC (Analog-to-Digital Converter); A step in which the capacitance determination signal output unit outputs the capacitance determination signal based on the voltages of the sampled capacitance detection node and the open circuit detection node; and The method further comprises the step of the disconnection determination signal output unit outputting the disconnection determination signal based on the voltage of the sampled capacitance detection node and the disconnection detection node. A diagnostic method for diagnosing the condition of a haptic vibration device.

19. In Paragraph 16, The above diagnostic step; is, The method further comprises the step of the diagnostic unit determining that the haptic vibration device is in a short-circuit state when both the capacitance determination signal and the open-circuit determination signal are in a state below a threshold reference voltage. A diagnostic method for diagnosing the condition of a haptic vibration device.

20. In Paragraph 16, The above diagnostic step; is, A step in which, if the above capacitance determination signal is in a state below a threshold reference voltage and the above disconnection determination signal is in a state above a threshold reference voltage, the diagnostic unit determines that the haptic vibration device is in a state of capacitance abnormality; and The method further comprises the step of the diagnostic unit determining that the haptic vibration device is in a disconnected state when the capacitance determination signal is in a state above a threshold reference voltage and the disconnection determination signal is in a state below a threshold reference voltage. A diagnostic method for diagnosing the condition of a haptic vibration device.

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