Voltage follower-type drive circuit apparatus, control method, and computer program product

Abstract

Embodiments of the present invention provide a voltage follower-type drive circuit apparatus, which is applicable to the technical field of integrated circuits. The voltage follower-type drive circuit apparatus comprises: a power supply module, a boost module, and an output module. The power supply module is used to provide an input voltage to the voltage follower-type drive circuit apparatus. The boost module is connected to an output end of the power supply module, and is used to provide a boost electrical signal to a load on the basis of a feedback electrical signal of the load and the input voltage. The output module is connected to an output end of the boost module, and is used to update a drive electrical signal of the load on the basis of the feedback electrical signal of the load, a preset reference signal, and the boost electrical signal. The embodiments of the present invention further provide a control method for a voltage follower-type drive circuit apparatus and a computer program product.

Description

Voltage follower type drive circuit device, control method and computer program product

[0001] Priority Statement

[0002] This invention claims priority to Chinese invention patent application number 202411637785.3, filed November 15, 2024, entitled "Piezoelectric Actuator Circuit and Method, Medium, and Device for Piezoelectric Driving Thereof," the entire contents of which are incorporated herein by reference. Simultaneously, this invention also claims priority to Chinese invention patent application number 202510379541.8, filed March 28, 2025, entitled "Voltage Follower Type Drive Circuit Device, Control Method, Device, Medium, and Product," the entire contents of which are incorporated herein by reference. Technical Field

[0003] This invention relates to the field of integrated circuit technology, specifically to the field of drive circuit technology, and more specifically to a voltage follower type drive circuit device, control method, and computer program product. Background Technology

[0004] Capacitor-type drive circuits typically convert the energy of the input voltage and drive a capacitive load through level conversion. The driving methods of capacitor-type drive circuits include boost and buck, similar to direct current (DC) voltage converters (i.e., DC-DC converters). In addition, the control of capacitor-type drive circuits is also divided into open-loop control and closed-loop control: (1) Open-loop control refers to the control of voltage and current in a level converter, which is achieved by directly controlling the switching state of the power transistor through the controller. The advantage of open-loop control is its simplicity and low cost, but its disadvantage is that it cannot eliminate the influence of external disturbances and cannot achieve precise output voltage control through feedback, thus easily leading to large fluctuations in output voltage and low accuracy. (2) Closed-loop control refers to the adjustment of the inductor current by monitoring and feedback the output voltage or current in a level converter, and adjusting the switching state of the power transistor according to the error, thereby controlling the output to reach the target voltage. The advantage of closed-loop control is that it can eliminate the influence of external disturbances, making the output voltage and current more stable and accurate, but due to the loop design, the system complexity is higher.

[0005] Existing level shifting systems can be single-stage or multi-stage. A single-stage architecture, also called a single-stage structure, directly drives the load through a switching power supply. This structure results in larger output ripple and relatively higher distortion. A multi-stage architecture typically cascades a low-dropout regulator (LDO) module after the switching power supply stage. This allows for large-dropout conversion in the first stage, followed by small-dropout conversion via the LDO module, significantly reducing output ripple, enhancing stability, and reducing distortion. However, capacitor-driven drive circuits designed based on existing level shifting systems still have the following drawbacks: complex control logic, reduced efficiency under low load due to switching frequency losses, and relatively high energy consumption. Summary of the Invention

[0006] In view of at least one of the technical problems existing in the prior art, the embodiments of the present invention provide a voltage follower type drive circuit device, control method and computer program, in order to provide an open-loop boost architecture that realizes voltage following, to provide stable power supply for the output voltage of the subsequent low dropout linear regulator waveform, and to construct a new structure of high-efficiency, low-loss capacitor type drive circuit.

[0007] One aspect of the present invention provides a voltage follower type drive circuit device, comprising a power supply module, a boost module, and an output module. The power supply module provides an input voltage to the voltage follower type drive circuit device; the boost module is connected to the output terminal of the power supply module and provides a boosted electrical signal to the load based on the load's feedback electrical signal and the input voltage; the output module is connected to the output terminal of the boost module and updates the load's drive electrical signal based on the load's feedback electrical signal, a preset reference signal, and the boosted electrical signal.

[0008] The boost module includes a boost unit, which comprises a control switch unit, a logic control unit, a first comparison unit, and a second comparison unit. The first comparison unit outputs a first control signal to the logic control unit based on the comparison result between the incremental electrical signal corresponding to the drive electrical signal of the output module and the boost electrical signal. The second comparison unit outputs a second control signal to the logic control unit based on the comparison result between the switching electrical signal of the control switch unit and a preset peak electrical signal. When the control switch unit is in an open-circuit state, the first control signal is configured to control the logic control unit to output a first switching control signal to the gate of the control switch unit, and the first switching control signal is configured to control the control switch unit to be in an on-circuit state. When the control switch unit is in an on-circuit state, the second control signal is configured to control the logic control unit to output a second switching control signal to the gate of the control switch unit, and the second switching control signal is configured to control the control switch unit to be in an open-circuit state. By controlling the on-circuit and open-circuit states of the control switch unit, the boost unit provides a boost electrical signal to the load based on the feedback electrical signal and input voltage of the load.

[0009] According to one embodiment of the present invention, the power supply module includes a voltage regulator unit. The input terminal of the voltage regulator unit is connected to a preset power rail of the power supply module, and the output terminal of the voltage regulator unit is grounded. The voltage regulator unit is used to provide voltage regulation for the input voltage of the power supply module.

[0010] According to one embodiment of the present invention, the boost module further includes a charging unit, a conduction unit, and a charge / discharge unit. The input terminal of the charging unit is connected to a preset power rail of the power module; one end of the boost unit is connected to the output terminal of the charging unit, and the other end of the boost unit is grounded. The boost unit is used to provide a boosted electrical signal to the load based on the feedback electrical signal and the input voltage of the load; the input terminal of the conduction unit is connected to the output terminal of the charging unit, and the output terminal of the conduction unit is connected to the input terminal of the output module; the input terminal of the charge / discharge unit is connected to the output terminal of the conduction unit, and the output terminal of the charge / discharge unit is grounded, used to output a boosted electrical signal to the output module.

[0011] According to one embodiment of the present invention, the drain of the control switch unit is connected to the output terminal of the charging unit, and the source of the control switch unit is grounded; the output terminal of the logic control unit is connected to the gate of the control switch unit, and is used to provide a switch control signal to the gate of the control switch unit according to a preset logic control rule.

[0012] According to an embodiment of the present invention, the first input terminal of the first comparison unit is connected to the incremental electrical signal corresponding to the driving electrical signal of the output module, the second input terminal of the first comparison unit is connected to the boost electrical signal of the output module, and the output terminal of the first comparison unit is connected to the third input terminal of the logic control unit. The first comparison unit is used to output a first control signal to the logic control unit based on the comparison result between the incremental electrical signal and the boost electrical signal. The fifth input terminal of the second comparison unit is connected to the switching electrical signal output from the drain of the control switching unit, the sixth input terminal of the second comparison unit is connected to the preset peak electrical signal, and the output terminal of the second comparison unit is connected to the fourth input terminal of the logic control unit. The second comparison unit is used to output a second control signal to the logic control unit based on the comparison result between the switching electrical signal and the preset peak electrical signal.

[0013] According to one embodiment of the present invention, the output module includes a voltage regulation control unit. The voltage regulation control unit uses the boost signal provided by the charging and discharging unit of the boost module as the input power source. The seventh input terminal of the voltage regulation control unit is connected to the sampled electrical signal of the load, the eighth input terminal of the voltage regulation control unit is connected to a preset reference signal, and the output terminal of the voltage regulation control unit is connected to the input terminal of the load. The voltage regulation control unit is used to output a drive electrical signal generated based on the comparison result between the sampled electrical signal and the preset reference signal.

[0014] According to one embodiment of the present invention, the output module further includes a digital-to-analog converter (DAC) unit and a digital signal unit. The output terminal of the DAC unit is connected to the eighth input terminal of the voltage regulator control unit, and the DAC unit is used to generate a preset reference signal from the received waveform digital signal through digital-to-analog conversion. The output terminal of the digital signal unit is connected to the input terminal of the analog unit, and the digital signal unit is used to provide the waveform digital signal to the DAC unit.

[0015] According to one embodiment of the present invention, the output module further includes a signal sampling unit. One end of the signal sampling unit is connected to the output terminal of the voltage regulation control unit, and the other end of the signal sampling unit is grounded.

[0016] According to one embodiment of the present invention, the signal sampling unit includes a first resistor and a second resistor. One end of the first resistor is connected to the output terminal of the voltage regulation control unit, and the other end of the first resistor is connected to the seventh input terminal of the voltage regulation control unit; one end of the second resistor is connected to the seventh input terminal of the voltage regulation control unit, and the other end of the second resistor is grounded.

[0017] Another aspect of the present invention provides a control method for the above-described voltage follower drive circuit device, comprising: controlling a power supply module to provide an input voltage to the voltage follower drive circuit device; providing a boost signal to the load via a boost module based on a feedback electrical signal from the load and the input voltage; and controlling an output module to update the drive signal of the load based on the feedback electrical signal from the load, a preset reference signal, and the boost signal.

[0018] According to one embodiment of the present invention, the boost module (302) includes a boost unit, and a first comparator (CMP1) controlling the boost unit calculates the boost signal (V) from the output module (303). OUT The corresponding incremental electrical signal and boost electrical signal (V) HV Based on the comparison result between the two, a first control signal is output to the logic control unit (321) of the boost unit; when the control switch unit (M0) of the boost unit is in the open circuit state, the logic control unit (321) is controlled by the first control signal to output a first switch control signal to the gate of the control switch unit (M0), and the first switch control signal is configured to control the control switch unit (M0) to be in the on state.

[0019] According to one embodiment of the present invention, the second comparator (CMP2) controlling the boost unit determines the voltage based on the switching signal of the control switch unit (M0) and the preset peak signal (I). ZTC Based on the comparison result between the two, a second control signal is output to the logic control unit (321) of the boost unit; when the control switch unit (M0) of the boost unit is in the on state, the logic control unit (321) is controlled by the second control signal to output a second switch control signal to the gate of the control switch unit (M0), and the second switch control signal is configured to control the control switch unit (M0) to be in the open state.

[0020] Another aspect of the present invention provides an electronic device including one or more processors and a memory for storing one or more programs, wherein when the one or more programs are executed by the one or more processors, the one or more processors cause the one or more processors to perform the control method of the voltage follower type drive circuit device described above.

[0021] Another aspect of the present invention provides a computer-readable storage medium having executable instructions stored thereon, which, when executed by a processor, cause the processor to perform the control method of the voltage follower drive circuit device described above.

[0022] Another aspect of the present invention provides a computer program product including a computer program that, when executed by a processor, implements the control method of the voltage follower type drive circuit device described above.

[0023] The voltage follower drive circuit device provided in this invention can at least partially solve the technical problems of complex structural design, low efficiency and high loss of existing capacitor drive circuits in the related art, and thus can achieve at least one of the following technical effects:

[0024] The voltage-following drive circuit device of this invention can serve as a load drive chip circuit. It can implement an asynchronous boost architecture and its open-loop control logic to generate a coarse "following voltage rail" that is not lower than the target voltage. Under this "following voltage rail," it implements the function of an LDO (Low Dropout Linear Regulator) module. This LDO module can be controlled by digital circuits to charge and discharge capacitive loads, achieving arbitrary voltage waveforms across the capacitor. Furthermore, during the output of arbitrary waveforms, the LDO module's supply voltage (i.e., the output voltage of the boost module) changes synchronously with the waveform to maintain a continuous and relatively small dropout, thereby significantly improving energy transfer efficiency. Therefore, this invention proposes an open-loop boost architecture that can achieve voltage following, providing power to the subsequent LDO module for arbitrary waveform output voltages, thus realizing a new structure for a high-efficiency, low-loss capacitive drive circuit.

[0025] Specifically, compared to the two-stage approach using traditional capacitor-type drive circuits, the voltage-follower drive circuit device of this invention has a simpler and more direct control logic in its technical implementation, and higher efficiency in applications with small capacitors. Therefore, the voltage-follower drive circuit device of this invention can be applied to the fields of large-scale mixed-signal integrated circuit chips and power management chips, and can be used for various applications requiring the driving of high-voltage capacitor-type loads, such as piezoelectric ceramic plate drivers, audio drivers, vibration motors, ignition controllers, etc., possessing extremely high commercial application value and scientific research value.

[0026] It should be understood that the above general description and the following specific embodiments are merely exemplary and illustrative, and do not limit the scope of the invention. Attached Figure Description

[0027] The above-described features, other objects, and advantages of the present invention will become clearer from the following description of embodiments of the invention with reference to the accompanying drawings, in which:

[0028] Figure 1 schematically shows the circuit composition of a capacitor-type driver in the prior art;

[0029] Figure 2 schematically shows the output voltage waveform of a capacitor-type driver in the prior art, as shown in Figure 1.

[0030] Figure 3 schematically shows a circuit diagram of a voltage follower type drive circuit device according to an embodiment of the present invention;

[0031] Figure 4 schematically illustrates the output voltage waveform of a voltage follower type drive circuit device according to an embodiment of the present invention;

[0032] Figure 5A schematically illustrates a flowchart of a control method for a voltage-following drive circuit device according to an embodiment of the present invention;

[0033] Figure 5B schematically illustrates an application scenario of the voltage follower drive circuit device, control method, apparatus, medium, and program product according to embodiments of the present invention; and

[0034] Figure 6 schematically illustrates a block diagram of an electronic device suitable for implementing a voltage-following drive circuit device according to an embodiment of the present invention.

[0035] The accompanying drawings mentioned above are part of the specification of embodiments of the present invention, illustrating exemplary embodiments of the invention. The drawings, together with the description in the specification, serve to illustrate the principles of the embodiments of the present invention. It should be understood that the above general description with reference to the drawings and the following detailed description are merely exemplary and illustrative, and do not limit the scope of the invention. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the spirit of the contents disclosed in the present invention will be clearly explained below with reference to the accompanying drawings and detailed description. After understanding the embodiments of the present invention, any person skilled in the art can make changes and modifications based on the technology taught in the present invention without departing from the spirit and scope of the present invention.

[0037] The illustrative embodiments and descriptions of the present invention are used to explain the invention, but are not intended to limit the invention. Furthermore, elements / components using the same or similar reference numerals in the drawings and embodiments are used to represent the same or similar parts.

[0038] The terms "first," "second," etc., used in this invention do not specifically refer to any order or sequence, nor are they intended to limit the invention; they are merely used to distinguish elements or operations described using the same technical terms.

[0039] The directional terms used in this invention, such as up, down, left, right, front, or back, are merely for reference to the accompanying drawings. Therefore, the directional terms used are for illustrative purposes and not for limiting the scope of this invention.

[0040] The terms “comprising,” “including,” “having,” “containing,” etc., used in this invention are all open-ended terms, meaning that they include but are not limited to.

[0041] The term "and / or" as used in this invention includes any or all combinations of the things mentioned.

[0042] In this invention, "multiple" includes "two" and "more than two"; in this invention, "multiple groups" includes "two groups" and "more than two groups".

[0043] The terms "approximately," "about," etc., used in this invention are intended to modify any quantity or error that may vary slightly, but these slight variations or errors do not change the essence of the quantity or error. Generally, the range of slight variations or errors modified by such terms may be 20% in some embodiments, 10% in some embodiments, 5% in some embodiments, or other values. Those skilled in the art should understand that the aforementioned values ​​can be adjusted according to actual needs and are not limited thereto.

[0044] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0045] When expressions such as "at least one of A, B, and C" are used, they should generally be interpreted in accordance with the meaning commonly understood by those skilled in the art (e.g., "a system having at least one of A, B, and C" should include, but is not limited to, systems having A alone, having B alone, having C alone, having A and B, having A and C, having B and C, and / or having A, B, and C, etc.). When expressions such as "at least one of A, B, or C" are used, they should generally be interpreted in accordance with the meaning commonly understood by those skilled in the art (e.g., "a system having at least one of A, B, or C" should include, but is not limited to, systems having A alone, having B alone, having C alone, having A and B, having A and C, having B and C, and / or having A, B, and C, etc.). Those skilled in the art should also understand that any conjunction and / or phrase that substantially arbitrarily indicates two or more optional items, whether in the specification, claims, or drawings, should be understood to indicate the possibility of including one of these items, either of these items, or both items. For example, the phrase “A or B” should be understood as including the possibility of “A” or “B”, or “A and B”.

[0046] In high-efficiency, low-power electronic devices, different loads require different driving methods and performance characteristics. Piezoelectric ceramic actuators, widely used in force generating devices, robots, impact motors, and optical scanning, require high resolution, fast response, and high thrust. Piezoelectric haptic actuators used in mobile phones, tablets, laptops, keyboards, mice, and touch-enabled devices need to be compatible with both low input voltage and high output voltage, and have fast haptic response times. Audio drivers, on the other hand, require power amplifier circuitry, low electromagnetic interference (EMI) across the entire bandwidth, and high linearity.

[0047] Currently available piezoelectric driver solutions typically consist of two parts: a boost level conversion stage and a linear regulator stage. In the boost level conversion stage, energy is transferred from the input to the output. The inductor and synchronous power switch operate in boost mode, raising the output voltage to a set value. The output voltage is controlled in a closed-loop manner, with feedback provided to adjust the switching transistor's operating state accordingly. The specific steps of the boost level conversion stage are as follows: the output voltage is sampled and compared with a reference voltage; based on the comparison result, the peak inductor current is adjusted to bring the output voltage closer to the given reference voltage; through continuous sampling and adjustment, the output voltage is stabilized at the set value. However, this closed-loop control method has a slow response to changes in input voltage and load due to bandwidth limitations, requiring the design of zero-pole distribution and compensation networks to stabilize the system. Furthermore, when the switching duty cycle is greater than 50%, a slope compensation circuit is needed to avoid subharmonic oscillations. Correspondingly, the linear regulator stage can modulate the output voltage of the boost module and be controlled by the low dropout regulator (LDO) loop, outputting any waveform set by the digital circuit.

[0048] Specifically, as shown in Figure 1, the circuit 100 of a prior art capacitor driver comprises an inductor (L1), a power transistor (Q1), a freewheeling diode (D1), and an error amplifier (EA). Together with a PWM control module using pulse width modulation (PWM) logic, they form a boost circuit. The output voltage HV of the boost circuit serves as the input voltage to the subsequent output logic control module 101. After processing by the LDO in the output logic control module 101, it is modulated into an arbitrary controlled waveform OUT and applied to the capacitive load Piezo.

[0049] The existing capacitor driver shown in Figure 1 has the following obvious shortcomings:

[0050] (1) The closed-loop control loop is placed in the boost circuit. Since the output load Piezo capacitor has a large range and the output voltage OUT has a wide range, the control logic is more complex. Customers need to set PID (Proportional, Integral, Derivative) parameters or perform loop compensation to achieve the best configuration, which is not conducive to customers expanding their applications.

[0051] (2) The loop control adopts the peak current control mode and feeds back the output voltage and inductor current to form a double feedback of voltage outer loop and current inner loop. However, the switching frequency and peak current cannot adapt to the load voltage magnitude and load voltage slope, resulting in switching frequency loss, which leads to reduced efficiency under low load.

[0052] (3) The LDO of the output logic control module 101 can modulate the HV voltage. Since the output arbitrary waveform range is large, the voltage dropout on the LDO will change with the output, as shown in Figure 2. Taking the output sine wave as an example, the energy loss caused by the voltage dropout accounts for a relatively large proportion of the total loss.

[0053] Therefore, traditional capacitor-driven circuit architectures use a closed-loop approach to achieve the first-stage boost, resulting in complex control logic and low efficiency when using small output capacitors. Furthermore, in traditional architectures, the second-stage LDO module operates under large dropout conditions, leading to high power consumption and low efficiency.

[0054] In view of at least one of the technical problems existing in the prior art, the embodiments of the present invention provide a voltage follower type drive circuit device, control method, equipment, medium and product, in order to provide an open-loop boost architecture for realizing voltage following, so as to provide stable power supply for the output voltage of the subsequent low dropout linear regulator waveform, and to construct a new structure of high-efficiency, low-loss capacitor type drive circuit.

[0055] The following will describe in detail the voltage follower drive circuit device of the disclosed embodiment, with reference to Figures 3 to 6, addressing the technical problems of the existing capacitor driver as shown in Figure 1.

[0056] As shown in Figures 3-6, one aspect of an embodiment of the present invention provides a voltage follower type drive circuit device 300, which includes a power supply module 301, a boost module 302 and an output module 303.

[0057] Power module 301 is used to provide input voltage V to voltage follower type drive circuit device 300. IN ;

[0058] The boost module 302 is connected to the output terminal of the power supply module 301 and is used to adjust the voltage based on the feedback electrical signal from the load P (such as a piezoelectric sensor Piezo) and the input voltage V. IN Provide a boosted electrical signal V to the load P HV ;

[0059] Output module 303 is connected to the output terminal of boost module 302, and is used to input the feedback electrical signal from load P, the preset reference signal, and the boost electrical signal V. HV Update the drive signal V of load P OUT .

[0060] The power module 301 can provide a preset power rail to the voltage follower type drive circuit device 300 of this embodiment of the invention. The preset power rail can be used to provide the input voltage V. IN Input voltage V IN It can be equivalent to the power supply voltage of the entire drive circuit device 300.

[0061] The input terminal of the boost module 302 can be connected to the output terminal of the power module 301. The boost module 302 can function as a boost logic control module (i.e., a Boost module) to perform boost operation according to the load demand of the output module 303. The feedback signal can be a detection signal of the load voltage on the load P. When the input voltage V... IN When applied to the boost module 302, the boost module 302 performs voltage boosting processing on the feedback electrical signal to generate a boosted electrical signal V. HV Among them, the boosted electrical signal V HV It can be applied to output module 303.

[0062] The boosted electrical signal V can be controlled by feedback electrical signals. HV The control enables the boost module 302 to adjust the output boost signal V based on the detected electrical signal on the load P. HV To achieve more precise control, such as in the boosted electrical signal V HV When the energy is insufficient, it can be replenished in time through the boost module 302.

[0063] The input terminal of the output module 303 is connected to the output terminal of the boost module 302, and the boosted electrical signal V can be input. HV This serves as the drive signal for the output module 303. The preset reference signal can be a reference signal generated based on the target drive signal of the load P, and can be used as the drive electrical signal V. OUT The reference is as follows. The target drive signal can be the optimal drive signal for load P, ensuring that load P operates in its optimal state. Drive signal V OUT It can be the actual load electrical signal of the load P.

[0064] Since both the boost module 302 and the output module 303 can control their respective voltage outputs based on the feedback electrical signal, the final drive electrical signal V applied to the load P is thus controlled. OUT It can continuously update and adjust, eventually stabilizing within an optimal threshold range to meet the actual optimal operating state of load P, thus getting closer to the ideal operating state corresponding to the preset reference signal. The feedback electrical signal can be the real-time drive electrical signal V of load P at a certain moment. OUT .

[0065] By controlling the on / off state of the control switch unit M0 of the boost module 302, the boost unit of the boost module 302 can adjust its voltage based on the feedback electrical signal from the load P and the input voltage V. IN Provide a boosted electrical signal V to the load P HV For details, please refer to Figure 3 and the following description of the boost module 302.

[0066] Therefore, the voltage follower type drive circuit device 300 of this embodiment can directly compare the output voltage with the target voltage, and thus control the boost module 302 to provide a boost electrical signal V to the output module 303. HV The boosted electrical signal V HV It can be a coarsely approximate follower voltage that is not lower than the target drive signal, and the output module 303 can adjust the boosted electrical signal V accordingly. HV To achieve the driving electrical signal V OUT Precise control is achieved. This allows for the construction of a drive control architecture with simpler and more direct control logic, effectively ensuring the stability of the circuit system. In low-load capacitor mode, the simple control method results in higher efficiency. Furthermore, this drive control architecture enables timely adjustment of arbitrary waveform output, allowing for further expansion of waveform output capabilities.

[0067] In addition, the output module 303 can output the boosted follower voltage (boosted electrical signal V). HV By performing level conversion before output, the output ripple is effectively suppressed, resulting in lower output signal distortion and higher linearity. Furthermore, the following voltage changes with the drive signal output by the output module 303, maintaining a state that is always slightly higher than the output voltage. This significantly reduces the dropout voltage across the output module 303, thereby significantly improving the overall drive efficiency of the drive circuit.

[0068] As shown in Figures 3-6, according to an embodiment of the present invention, the power supply module 301 includes a voltage regulator unit C. VIN .

[0069] Voltage Regulator C VINThe input terminal is connected to the preset power rail of the power module 301, and the voltage regulator unit C VIN The output terminal is grounded to GND, and the voltage regulator unit C... VIN It is used to provide voltage regulation for the input voltage of power module 303. The preset power rail of power module 301 can be a line for transmitting power, which is usually dedicated to powering the circuit module.

[0070] With the help of this voltage regulator unit C VIN Typically, it can be a circuit unit composed of one or more capacitors, capable of utilizing the principle of capacitor charging and discharging to operate at a preset input voltage V on a power rail. IN When signal fluctuations occur, it acts to regulate the input voltage V. IN The signal stabilization function prevents input voltage V IN The fluctuation interference has a negative impact on the subsequent boost module 302 and output module 303.

[0071] As shown in Figures 3-6, according to an embodiment of the present invention, the boost module 302 includes a charging unit L0, a boost unit, a conduction unit D0, and a charge / discharge unit C. HV .

[0072] The input terminal of the charging unit L0 is connected to the preset power rail of the power module 301. The charging unit L0 can specifically be one or more inductive elements, capable of satisfying the requirement of applying an input voltage V. IN Complete its own recharging.

[0073] One end of the boost unit is connected to the output terminal of the charging unit L0, and the other end of the boost unit is grounded (GND). The boost unit is used to adjust the voltage based on the feedback signal from the load P and the input voltage V. IN Provide a boosted electrical signal V to the load P HV .

[0074] The input terminal of the conduction unit D0 is connected to the output terminal of the charging unit L0, and the output terminal of the conduction unit D0 is connected to the input terminal of the output module 303. The conduction unit D0 can satisfy the unidirectional current conduction function of the boost unit to the output module 303, and can be one or more unidirectional conduction diode elements.

[0075] Charge / discharge unit C HV The input terminal is connected to the output terminal of the conduction unit D0, and the charge / discharge unit C HV The output terminal is grounded to GND, which is used to output a boosted electrical signal V to the output module 303. HV Among them, the charge / discharge unit C HV Specifically, it can be one or more capacitor elements.

[0076] Specifically, when in charging mode, the boost unit of the boost module 302 can control its own grounding to conduct according to the feedback electrical signal, so that the charging unit L0 is charged according to the input voltage V applied by the power module 301. IN Charge it.

[0077] When in boost mode, the boost unit of boost module 302 can disconnect its own ground. At this time, charging unit L0 will supply power to charging / discharging unit C through conducting unit D0. HV Unidirectional charging enables the charging and discharging unit C to... HV Gradual charging is achieved. At this point, when the boost unit again controls its own grounding based on the feedback signal, the charge / discharge unit C... HV Then, a boosted electrical signal V can be provided to the output module 303 through a gradual discharge process. HV .

[0078] Therefore, the boost module 302 enables the boost function for the output module 303, and by controlling the open or closed state of the boost unit, the charging and discharging unit C can be activated. HV The output module is charged and discharged to provide a boosted electrical signal V. HV The driving electrical signal V at both ends of the load P OUT The system follows the electrical signal. Therefore, it can always maintain system stability, making the control logic simpler and more direct, and the control efficiency higher.

[0079] As shown in Figures 3-6, according to an embodiment of the present invention, the boost unit includes a control switch unit and a logic control unit.

[0080] The drain of the control switch unit M0 is connected to the output terminal of the charging unit L0, and the source of the control switch unit M0 is grounded to GND. The control switch unit M0 can be one or more power transistors, which can be power metal-oxide-semiconductor field-effect transistors (Power-MOSFETs).

[0081] The output terminal of the logic control unit 321 is connected to the gate of the control switch unit M0, and is used to provide a switch control signal to the gate of the control switch unit M0 according to a preset logic control rule. The logic control unit 321 can be a circuit control module composed of logic control circuits, which can output a corresponding switch control signal according to the preset logic control rule. When the switch control signal is applied to the gate of the control switch unit M0, it can serve as a control signal for turning the control switch unit M0 on or off. Therefore, the switch control signal, as the gate-source voltage of the control switch unit M0, can control the turn-on and turn-off of the control switch unit M0 under different high and low level conditions.

[0082] The preset logic control rules can be predefined information for controlling the output switch control signals. For example, in the charging state, the logic control unit 321 can output a high-level switch control signal to the gate of the control switch unit M0 according to a specific first logic control signal, controlling the control switch unit M0 to be turned on, at which time the boost unit is in a grounded and on state. Correspondingly, in the boost state, the logic control unit 321 can output a low-level switch control signal to the gate of the control switch unit M0 according to a specific second logic control signal, controlling the control switch unit M0 to be turned off, at which time the boost unit is in a de-energized state. The first and second logic control signals can be generated by processing the feedback electrical signal, and can be generated by the logic control unit 321 or only selectively received.

[0083] This allows for precise control of the boost process of the boost unit in the boost module 302, ensuring that the boost electrical signal V applied to the output module 301 is accurate. HV Stability.

[0084] As shown in Figures 3-6, according to an embodiment of the present invention, the boost unit further includes a first comparator unit CMP1 and a second comparator unit CMP2. The first comparator unit CMP1 and the second comparator unit CMP2 can be comparator (CMP) circuit elements with the same configuration or different configurations.

[0085] The first input terminal of the first comparison unit CMP1 is connected to the drive electrical signal V of the output module 302. OUT The corresponding incremental electrical signal is connected to the boosted electrical signal V of the output module 303 at the second input terminal of the first comparison unit CMP1. HV The output of the first comparison unit CMP1 is connected to the third input of the logic control unit 321. The first comparison unit CMP1 is used to compare the incremental electrical signal and the boosted electrical signal V. HV The comparison result is used to output a first control signal to the logic control unit 321.

[0086] Incremental electrical signal VΔ It can be a driving electrical signal V OUT The increment signal, specifically, the two satisfy the following relationship: V Δ =V OUT +ΔV. Here, ΔV is an incremental signal value relative to the driving electrical signal, for example, ΔV = 2V, and can be specifically defined according to the actual requirements of the load P (such as the target driving signal). The feedback electrical signal can be the driving electrical signal V of the load P, which is detected and acquired in real time. OUT Specifically, this can be obtained through voltage detection technology. The driving electrical signal V... OUT The conversion to incremental electrical signals can be achieved through voltage conversion technology, which will not be elaborated on in detail.

[0087] Incremental electrical signal and boost electrical signal V HV After electrical conversion (e.g., conversion to current signals), the signals can be used as two differential input signals of the first comparison unit CMP1. The first comparison unit CMP1 can control the output of a first control signal to the logic control unit 321 based on the comparison result of the two signals. For example, when the boosted electrical signal V... HV Satisfy: V HV <V Δ When the first comparison unit CMP1 outputs a first control signal to the logic control unit 321, the logic control unit 321 can apply a switch control signal (such as a high-level signal) to the gate of the control switch unit M0 according to the first control signal and the preset logic control rules, so that the control switch unit M0 is turned on, thereby enabling the boost unit to enter the charging state and charge the charging unit L0.

[0088] The fifth input terminal of the second comparator CMP2 is connected to the switching signal output from the drain of the control switch unit M0, and the sixth input terminal of the second comparator CMP2 is connected to the preset peak signal I. ZTC The output of the second comparison unit CMP2 is connected to the fourth input of the logic control unit 321. The second comparison unit CMP2 is used to compare the switching electrical signal and the preset peak electrical signal I. ZTC The comparison result is used to output a second control signal to the logic control unit.

[0089] The switching signal can be a current signal controlling the switching unit M0, and can be used to provide feedback on the current of the charging unit L0 when the boost unit is in the on state. Specifically, when the controlling switching unit M0 changes from the off state to the on state, the switching signal can increase significantly, or when the controlling switching unit M0 changes from the on state to the off state, the switching signal can decrease significantly. This reflects the on / off state of the controlling switching unit M0.

[0090] Preset peak electrical signal I ZTCThis can be a reference signal for the switching electrical signal. The preset peak electrical signal and the switching electrical signal can each be used as two differential input signals of the second comparison unit CMP2. The second comparison unit CMP2 can control the output of a second control signal to the logic control unit 321 based on the comparison result between the two. For example, when the switching electrical signal increases to a level that is different from the preset peak electrical signal I... ZTC Simultaneously, the second comparison unit CMP2 can output a second control signal to the logic control unit 321. The logic control unit 321 can apply a switching control signal (such as a low-level signal) to the gate of the control switch unit M0 according to the second control signal and the preset logic control rules, so that the control switch unit M0 is turned off, thereby causing the boost unit to enter the boost state and the charge / discharge unit CMP2 to enter the boost state. HV Perform gradual charging. This charge / discharge unit C... HV A boosted electrical signal V can be provided to the output module 303 through a gradual discharge process. HV .

[0091] It should be noted that, in the embodiments of the present invention, the first control signal may be the first logic control signal described above, and the second control signal may be the second logic control signal described above.

[0092] Therefore, by using this boost module 302 (i.e., the BOOST module) and through open-loop architecture comparison logic control, a voltage higher than the highest drive signal V can be output. OUT A coarser follower voltage, ΔV higher (e.g., 2V), is also needed as the boost signal V. HV .

[0093] As shown in Figures 3-6, according to an embodiment of the present invention, when the control switch unit M0 is in an open circuit state, the first control signal is configured to control the logic control unit 321 to output a first switch control signal to the gate of the control switch unit M0, and the first switch control signal is configured to control the control switch unit M0 to be in an on circuit state.

[0094] When the control switch unit M0 is in the on state, the second control signal is configured to control the logic control unit 321 to output the second switch control signal to the gate of the control switch unit M0, and the second switch control signal is configured to control the control switch unit M0 to be in the open state.

[0095] The switch control signal may include a first switch control signal (such as a high-level signal) and a second switch control signal (such as a low-level signal).

[0096] When the first comparison unit CMP1 outputs a first control signal to the logic control unit 321 based on the incremental electrical signal and the boost electrical signal, the logic control unit 321 can enable the control switch unit M0 to be in the conducting state. At this time, the charging unit L0 is in the input voltage V IN It is charged under the action of [something].

[0097] During the charging process of the charging unit L0, when the second comparison unit CMP2 outputs a second control signal to the logic control unit 321 based on the real-time detected switching signal of the control switch unit M0 and the preset peak signal, the logic control unit 321 can make the control switch unit M0 open. At this time, the charging unit L0 supplies power to the charging and discharging unit C through the conduction unit D0. HV Gradual charging is performed. When the control switch unit M0 is turned off again, the charge / discharge unit C... HV The output module can be gradually discharged to provide a boosted electrical signal V. HV .

[0098] This allows for the construction of a simpler and more direct boost control circuit architecture, enabling precise control of the boost process and achieving the boost signal V based on the real-time detected electrical signal of the load P. HV Timely and accurate updates can significantly improve circuit stability, ensure higher control efficiency, and enable timely adjustment of arbitrary waveforms.

[0099] It can be seen that, using the output voltage of the aforementioned boost module 302 (i.e., the boost electrical signal V) HV The feedback electrical signal (i.e., the drive electrical signal V) of the load P and the load P OUT ) for comparison, when the boosted electrical signal V HV When the voltage is insufficient, the boost converter can be activated to supplement energy. The voltage value of the boost signal can be roughly maintained at a level that is about at least one increment signal value ΔV higher than the drive signal.

[0100] As shown in Figures 3-6, according to an embodiment of the present invention, the output module 303 includes a voltage regulation control unit (LDO).

[0101] The voltage regulator control unit LDO uses the charge / discharge unit C of the boost module 302. HV The provided boosted electrical signal V HV As the input power supply, the seventh input terminal of the voltage regulator control unit (LDO) is connected to the sampled electrical signal of the load P, the eighth input terminal of the voltage regulator control unit (LDO) is connected to the preset reference signal, and the output terminal of the voltage regulator control unit (LDO) is connected to the input terminal of the load P. The voltage regulator control unit (LDO) is used to output the drive electrical signal V generated based on the comparison result of the sampled electrical signal and the preset reference signal. OUT .

[0102] The voltage regulation control unit (LDO) can be a low-dropout regulator (LDO). This LDO can use the output of the boost module 302 as a power rail, and boost the voltage signal V output from that power rail. HV As a power supply electrical signal.

[0103] Similar to how the feedback signal serves as the real-time detection signal for the load P, the sampled signal can also be used to reflect the real-time detection signal for the load P. Unless under special circumstances, the sampled signal can generally differ from the feedback signal, at least in amplitude. A preset reference signal can serve as a reference signal for the sampled signal. Specifically, the voltage regulation control unit LDO can use the voltage difference between the sampled signal and the preset reference signal as a comparison result, based on the boosted signal V, which is the power supply signal for the output module 303. HV The driving electrical signal V on the load P OUT Update it. The driving electrical signal V is involved. OUT This is the output signal after being amplified by the voltage regulator control unit (LDO).

[0104] Because the boosted electrical signal, which serves as the power supply signal for the output module 303, is precisely controlled by the boost module 302, the boosted electrical signal V... HV Able to accurately follow the drive electrical signal V of the load P OUT This ensures that the voltage dropout of the LDO, which is the second-stage voltage regulator control unit, can be minimized. Therefore, the energy loss of the LDO is significantly reduced, the power consumption of the entire circuit is significantly reduced, and the circuit efficiency is significantly improved.

[0105] As shown in Figures 3-6, according to an embodiment of the present invention, the output module 303 further includes a digital-to-analog converter (DAC) and a digital signal unit 331.

[0106] The output of the digital-to-analog converter (DAC) is connected to the eighth input of the voltage regulator control unit (LDO). The DAC is used to generate a preset reference signal from the received waveform digital signal through digital-to-analog conversion.

[0107] The output of the digital signal unit 331 is connected to the input of the digital-to-analog converter (DAC). The digital signal unit is used to provide waveform digital signals to the DAC.

[0108] As a component of the output module, the digital signal unit 331 can receive digital signals of the output voltage polarity and amplitude as waveform digital signals through its I / O ports. This waveform digital signal is then transmitted to the digital-to-analog converter (DAC). The DAC generates a voltage signal containing amplitude information, which serves as the reference voltage for the voltage regulation control unit LDO (as shown in Figure 3). The DAC can be a digital-to-analog converter (DAC), the specifics of which will not be elaborated upon.

[0109] As shown in Figures 3-6, according to an embodiment of the present invention, the output module 303 further includes a signal sampling unit.

[0110] One end of the signal sampling unit is connected to the output of the voltage regulation control unit LDO, and the other end of the signal sampling unit is grounded to GND.

[0111] As shown in Figures 3-6, according to an embodiment of the present invention, the signal sampling unit includes a first resistor R3 and a second resistor R4.

[0112] One end of the first resistor R3 is connected to the output terminal of the voltage regulator control unit LDO, and the other end of the first resistor R3 is connected to the seventh input terminal of the voltage regulator control unit LDO.

[0113] One end of the second resistor R4 is connected to the seventh input terminal of the voltage regulation control unit LDO, and the other end of the second resistor R4 is grounded (GND).

[0114] The signal sampling unit composed of the first resistor R3 and the second resistor R4 ensures that the voltage regulator control unit LDO acquires the sampled electrical signal, making the sampled electrical signal only a fixed proportion of the drive electrical signal of the load P. This ensures that the voltage regulator control unit LDO operates normally while accurately reflecting the drive electrical signal.

[0115] In this way, the boosted electrical signal V, which follows the voltage rail, is used. HV Under its influence, it can achieve precise output control of the voltage regulation control unit LDO (low dropout linear regulator) and drive loads such as capacitors to output precise voltage.

[0116] Based on the detailed description of the voltage follower type drive circuit device of the above embodiments of the present invention, it can be seen that the output control flow of the drive waveform of the drive circuit device is mainly as follows:

[0117] As shown in Figure 3, the boost module 302 (BOOST module) converts the input voltage V IN It is converted to a signal that is continuously higher than the driving electrical signal V. OUT The coarse voltage (i.e., the incremental electrical signal V) OUT+2V), the upcoming boosted electrical signal V HV and incremental electrical signal V OUT +2V serves as the two differential inputs of the first comparator unit CMP1.

[0118] When the boosted electrical signal V HV <Incremental electrical signal V OUT At +2V, the output signal NEEDSWON of the first comparator unit CMP1 is set to 1 as the first control signal. The logic control unit 321 inputs a first switch control signal to the control switch unit M0 to open the control switch unit M0 based on the first control signal. At this time, the control switch unit M0 enters the conducting state, and the input voltage V... IN Charge the charging unit L0.

[0119] When the control switch unit M0 enters the closed state to charge the charging unit L0, the second comparison unit CMP2 starts working. When the current of the charging unit L0 (i.e., the switching signal of the control switch unit (M0)) rises to the preset peak current threshold I... ZTC When the preset peak electrical signal is reached, the output signal CLIM of the second current comparison unit CMP2 is set to 1 as the second control signal. The logic control unit 321 inputs a second switch control signal to the control switch unit M0 to turn off the control switch unit M0 according to the second control signal. At this time, the control switch unit M0 enters the open circuit state and the charging unit L0 starts to discharge through the conduction unit D0.

[0120] Specifically, the discharge process of the charging unit L0 can replenish energy to the charging and discharging unit C. HV This allows power to be supplied to the output module 303. Therefore, the boosted electrical signal V, which serves as the power rail of the output module 303,... HV It can be roughly maintained at a value greater than the driving electrical signal V. OUT The voltage level is approximately 2V.

[0121] Furthermore, after the output module 303 is replenished with energy through the boost module 302, the boosted electrical signal V... HV Under the power rail, the output module 303 can charge and discharge the load P (such as a PIEZO capacitor) to achieve arbitrary waveform (including sine wave) output.

[0122] As shown in Figure 3, the main function of the logic control unit 321 is to determine the on / off state of the control switch unit M0 through a series of logical operations on signals, and to control the switching of the boost module 302 between the two operating modes of continuous conduction mode (CCM) and intermittent conduction mode (DCM). The internal logic of the logic control unit 321 can be mainly divided into the following three parts:

[0123] Part 1: When the boosted electrical signal V of the first comparison unit PM1 HV The input voltage reaches the threshold (V) of the incremental electrical signal. OUT When +2V), the control switch unit M0 is turned on to conduct; when the boost signal V from the first comparison unit PM1 is turned on... HV The input voltage exceeds the threshold (V) of the incremental electrical signal. OUT When +2V), the control switch unit M0 is turned off.

[0124] In the second part, the minimum turn-off time or maximum turn-on time of the control switch unit M0 involved in the boost unit can be controlled by adjusting the inverter with added delay to ensure that all logic operates correctly. For example, when the turn-off time of the control switch unit M0 reaches the set minimum turn-off time, the control switch unit M0 is turned on; when the turn-off time of the control switch unit M0 reaches the set maximum turn-on time, the control switch unit M0 is turned off.

[0125] Part 3: When in intermittent conduction mode (DCM mode), whenever the minimum off time of control switch unit M0 is reached, check whether the first control signal (NEEDSWON signal) output by the first comparison unit PM1 is high. If it is high (even when operating in DCM mode, the on time of control switch unit M0 is insufficient to make the proportional incremental electrical signal V...), OUT When the current I corresponding to +2V reaches the set peak current, it enters the CCM state. In the continuous conduction mode (CCM mode), each time the fixed off-time of the CCM state is reached (i.e., the rising edge of TIME_OPEN), the first control signal (NEEDSWON signal) output by the first comparison unit PM1 is checked to see if it is low. If it is low, it means that the on-time of the control switch unit M0 is sufficient to make the current proportional to the incremental electrical signal V... OUT The current I corresponding to +2V reaches the set peak current, so there is no need to work in CCM mode, and thus it exits CCM state and enters DCM state.

[0126] Therefore, as shown in Figure 4, the voltage follower type drive circuit device described above in this embodiment of the invention can realize the boosted electrical signal V during the load drive process. HV Precisely follows the load drive electrical signal V OUT The phenomenon of smaller pressure dropout between the two can achieve at least the following technical effects:

[0127] (1) First, open-loop control is used to realize the boost function of the boost module 302, and the boost output electrical signal V is boosted. HV Directly connected to the target drive electrical signal V OUTThe system compares the output voltage with the target drive signal and then controls the switching of the control unit to obtain a coarsely approximate following voltage. The precise control of the final output voltage is then handled by the subsequent voltage regulation control unit (LDO). This circuit architecture simplifies the control logic, maintains system stability, and improves efficiency under low-load capacitor mode. Furthermore, this control architecture can promptly adjust and extend any desired output waveform.

[0128] (2) In addition, it can adaptively and flexibly switch between continuous conduction mode (CCM) and discontinuous conduction mode (DCM) according to load requirements (such as the size of the load capacitor). When the drive is under heavy load, it automatically enters the discontinuous conduction mode (DCM) working mode, while when the drive is under light load, it enters the continuous conduction mode (CCM), which greatly improves the efficiency of the circuit. The switching process is smooth and without dead zones, and the output waveform accuracy is not affected.

[0129] (3) Moreover, the input voltage of the voltage regulator control unit LDO is controlled to follow the dynamic changes of the output voltage, so that the voltage regulator control unit LDO operates under a low dropout condition, thus significantly reducing the energy loss on the voltage regulator control unit LDO.

[0130] Therefore, compared to the traditional two-level architecture with its complex and inefficient control logic, the voltage follower drive circuit device described in this embodiment of the invention is a drive architecture with a simpler structural design and more direct control logic, which can achieve higher drive efficiency for small capacitor applications.

[0131] Based on the voltage follower drive circuit device described in the above embodiments of the present invention, the present invention also provides a control method for the voltage follower drive circuit device. This control method will be described in detail below with reference to Figures 5A-6.

[0132] As shown in FIG5A, another aspect of the present invention provides a control method for the voltage follower type drive circuit device 300 described above, which includes operations S501 to S503.

[0133] In operation S501, the control power module 301 provides an input voltage V to the voltage follower type drive circuit device 300. IN ;

[0134] In operation S502, the boost module 302 determines the voltage based on the load's feedback electrical signal and the input voltage V. IN Provide boosted electrical signal V to the load HV ;as well as

[0135] In operation S503, the control output module 303 determines the load based on the feedback electrical signal, the preset reference signal, and the boost electrical signal V. HV Update the load drive signal V OUT .

[0136] To enable those skilled in the art to have a clearer understanding of the control method of the voltage follower type drive circuit device described in the embodiments of the present invention, the following detailed description is provided in conjunction with the specific implementation examples shown in FIG3.

[0137] Boost module 302 (i.e., BOOST module) is used to boost the input voltage V IN It is converted to a signal that is continuously higher than the driving electrical signal V. OUT The rough voltage is used as the boost signal V HV The voltage boost signal V is about to be activated. HV and incremental electrical signal (V) OUT +2V) are used as the two differential inputs of the first comparator CMP1. Wherein, when the boost signal V... HV <Incremental electrical signal V OUT When the voltage is +2V, the output signal NEEDSWON of the first comparator CMP1 is set to 1 as the first control signal. After a series of logic control processes by the logic control unit 321, the power transistor M0 can be turned on to charge the inductor L0.

[0138] At this point, the second comparator CMP2 starts working. When the inductor current (switching signal) it detects rises to the preset peak current threshold I... ZTC At this time, the output signal CLIM of the second comparator CMP2 is set to 1 as the second control signal, and controls the power transistor M0 to turn off (disconnect). Current from inductor L0 begins to flow through diode D0 to capacitor C. HV Discharge, replenishing energy to capacitor C HV The power supply is provided to the output module 303 of the H-bridge architecture. Therefore, the boost signal V serves as the power input voltage for the power rail of the output module 303. HV The voltage can be roughly maintained at a level lower than the drive signal V of the load P. OUT The voltage level is approximately 2V.

[0139] Among them, when the boost module 302 transmits the boosted electrical signal V HV After replenishing the output module 303 with energy, it is connected to the boost electrical signal V. HV The LDO structure of the power rail regulator can charge and discharge the capacitor of the load P (such as the capacitive piezoelectric sensor Piezo) to achieve arbitrary waveform (including sine wave) output.

[0140] The reference voltage of the LDO regulator is generated by a digital-to-analog converter (DAC). This digital circuit can output a 12-bit sine wave signal code, which is converted into an analog signal by the DAC and used as the reference voltage of the LDO regulator. The LDO regulator then amplifies the reference voltage and outputs the waveform to the capacitor of the load P.

[0141] After the circuit design described above, the voltage waveform signal shown in Figure 4 can be obtained, where the boost signal V... HV The voltage is boost-controlled, precisely and stably following the drive electrical signal V. OUT Under these conditions, the dropout of the second-stage regulator LDO is minimized, thus significantly reducing energy loss on the regulator LDO.

[0142] In summary, it can be seen that the driving circuit device 300 based on the above embodiments of the present invention can achieve the following technical effects:

[0143] (1) An open-loop control is used to achieve the boost function. The output voltage is directly compared with the target voltage, and the switching of the power transistor is controlled to obtain a coarse follower voltage that is not lower than the target voltage. The precise control of the output voltage is placed at the LDO stage (the voltage carrying the required signal information generated by the digital-to-analog converter is introduced into the LDO, and the conduction current of the power transistor in the LDO is controlled according to the error amplifier, logic switches, and other structures to achieve precise control of the output voltage). This structure makes the control logic simpler and more direct, and always maintains the stability of the system. In the small load capacitor mode, the simple control method makes the efficiency higher. Moreover, this control architecture can adjust any output waveform in a timely manner and can be extended.

[0144] (2) The system can switch flexibly between continuous conduction mode (CCM) and discontinuous conduction mode (DCM) according to the size of the load capacitance. When driving heavy load, the system works in continuous conduction mode, and the inductor current is greater than 0 at the end of each cycle and remains continuous in the next cycle. When driving light load, the system works in discontinuous conduction mode, and the inductor current drops to 0 at the end of each cycle. The inductor current is discontinuous, which greatly improves the efficiency of the circuit.

[0145] When the load capacitance is small, the BOOST will first operate in discontinuous conduction mode; as the load capacitance gradually increases, the switching frequency of the discontinuous conduction mode gradually increases; as the load capacitance continues to increase, the BOOST will enter the critical conduction mode and then switch to the continuous conduction mode to improve the load capacity.

[0146] (3) The output stage converts the boosted follower voltage through the level conversion of the LDO regulator before outputting it, which has a good suppression effect on output ripple, low output signal distortion, and high linearity. The input voltage of the LDO regulator is controlled to follow the output voltage of the LDO regulator, maintaining a state that is always slightly higher than the output voltage, thereby reducing the dropout of the LDO regulator and improving the efficiency of the LDO regulator.

[0147] Therefore, the technical effects that the control method of the voltage follower type drive circuit device described in the embodiments of the present invention can achieve can be specifically referred to the above-described technical effects for the voltage follower type drive circuit device. At the same time, it can improve the output efficiency of the load drive electrical signal, reduce circuit power consumption, and improve circuit efficiency.

[0148] Figure 5B schematically illustrates an application scenario of the voltage follower type drive circuit device, control method, apparatus, medium, and program product according to embodiments of the present invention.

[0149] As shown in Figure 5B, application scenario 500 according to this embodiment may include terminal devices 501, 502, and 503, a network 504, and a server 505. Network 504 serves as a medium for providing a communication link between terminal devices 501, 502, and 503 and server 505. Network 504 may include various connection types, such as wired or wireless communication links, or fiber optic cables, etc.

[0150] Users can use terminal devices 501, 502, and 503 to interact with server 505 via network 504 to receive or send messages, etc. Various communication client applications can be installed on terminal devices 501, 502, and 503, such as shopping applications, web browser applications, search applications, instant messaging tools, email clients, social media platform software, etc. (for example only).

[0151] Terminal devices 501, 502, and 503 can be various electronic devices with displays that support web browsing, including but not limited to smartphones, tablets, laptops, and desktop computers.

[0152] Server 505 can be a server that provides various services, such as a backend management server that supports websites browsed by users using terminal devices 501, 502, and 503 (for example only). The backend management server can analyze and process data such as received user requests, and feed back the processing results (such as web pages, information, or data obtained or generated according to user requests) to the terminal devices.

[0153] It should be noted that the control method of the voltage follower drive circuit device provided in the embodiments of the present invention can generally be executed by server 505. Accordingly, the voltage follower drive circuit device provided in the embodiments of the present invention can generally be located in server 505. The control method of the voltage follower drive circuit device provided in the embodiments of the present invention can also be executed by a server or server cluster that is different from server 505 and capable of communicating with terminal devices 501, 502, 503 and / or server 505. Accordingly, the voltage follower drive circuit device provided in the embodiments of the present invention can also be located in a server or server cluster that is different from server 505 and capable of communicating with terminal devices 501, 502, 503 and / or server 505.

[0154] It should be understood that the number of terminal devices, networks, and servers in Figure 5B is merely illustrative. Depending on implementation needs, any number of terminal devices, networks, and servers can be included.

[0155] Figure 6 schematically illustrates a block diagram of an electronic device suitable for implementing a control method for a voltage-following drive circuit device according to an embodiment of the present invention.

[0156] The electronic device provided in the embodiments of the present invention includes one or more processors and a memory, wherein the memory is used to store one or more programs, wherein when the one or more programs are executed by the one or more processors, the one or more processors cause the one or more processors to execute the control method of the voltage follower type drive circuit device.

[0157] As shown in FIG6, an electronic device 600 according to an embodiment of the present invention includes a processor 601, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 602 or a program loaded from a storage portion 608 into a random access memory (RAM) 603. The processor 601 may include, for example, a general-purpose microprocessor (e.g., a CPU), an instruction set processor and / or an associated chipset and / or a special-purpose microprocessor (e.g., an application-specific integrated circuit (ASIC)), etc. The processor 601 may also include onboard memory for caching purposes. The processor 601 may include a single processing unit or multiple processing units for performing different actions of the method flow according to an embodiment of the present invention.

[0158] RAM 603 stores various programs and data required for the operation of electronic device 600. Processor 601, ROM 602, and RAM 603 are interconnected via bus 604. Processor 601 executes various operations of the method flow according to embodiments of the present invention by executing programs in ROM 602 and / or RAM 603. It should be noted that the programs may also be stored in one or more memories other than ROM 602 and RAM 603. Processor 601 may also execute various operations of the method flow according to embodiments of the present invention by executing programs stored in said one or more memories.

[0159] According to an embodiment of the present invention, the electronic device 600 may further include an input / output (I / O) interface 605, which is also connected to a bus 604. The electronic device 600 may also include one or more of the following components connected to the I / O interface 605: an input section 606 including a keyboard, mouse, etc.; an output section 607 including a cathode ray tube (CRT), liquid crystal display (LCD), etc., and a speaker, etc.; a storage section 608 including a hard disk, etc.; and a communication section 609 including a network interface card such as a LAN card, modem, etc. The communication section 609 performs communication processing via a network such as the Internet. A drive 610 is also connected to the I / O interface 605 as needed. A removable medium 611, such as a disk, optical disk, magneto-optical disk, semiconductor memory, etc., is installed on the drive 610 as needed so that computer programs read from it can be installed into the storage section 608 as needed.

[0160] The present invention also provides a computer-readable storage medium having executable instructions stored thereon, which, when executed by a processor, cause the processor to perform the control method of the voltage follower type drive circuit device described above.

[0161] The computer-readable storage medium may be included in the device / apparatus / system described in the above embodiments; or it may exist independently and not assembled into the device / apparatus / system. The computer-readable storage medium carries one or more programs, which, when executed, implement the control method of the voltage-following drive circuit device according to the embodiments of the present invention.

[0162] According to embodiments of the present invention, a computer-readable storage medium may be a non-volatile computer-readable storage medium, such as including, but not limited to: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In the present invention, a computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device. For example, according to embodiments of the present invention, a computer-readable storage medium may include ROM 602 and / or RAM 603 and / or one or more memories other than ROM 602 and RAM 603 described above.

[0163] Embodiments of the present invention also include a computer program product comprising a computer program that, when executed by a processor, implements the control method of the voltage follower drive circuit device described above.

[0164] The computer program includes program code for executing the methods shown in the flowchart. When the computer program is run on a computer system, the program code enables the computer system to implement the control method of the voltage follower drive circuit device described in the embodiments of the present invention.

[0165] When the computer program is executed by the processor 601, it performs the functions defined in the system / apparatus of this invention. According to embodiments of the invention, the systems, apparatuses, modules, units, etc., described above can be implemented by computer program modules.

[0166] In one embodiment, the computer program may rely on a tangible storage medium such as an optical storage device or a magnetic storage device. In another embodiment, the computer program may also be transmitted and distributed in the form of signals over a network medium, and downloaded and installed via the communication section 609, and / or installed from the removable medium 611. The program code contained in the computer program can be transmitted using any suitable network medium, including but not limited to: wireless, wired, etc., or any suitable combination thereof.

[0167] In such an embodiment, the computer program can be downloaded and installed from a network via the communication section 609, and / or installed from the removable medium 611. When the computer program is executed by the processor 601, it performs the functions defined in the system of this embodiment of the invention. According to embodiments of the invention, the systems, devices, apparatuses, modules, units, etc., described above can be implemented by computer program modules.

[0168] According to embodiments of the present invention, program code for executing the computer programs provided in the embodiments of the present invention can be written in any combination of one or more programming languages. Specifically, these computational programs can be implemented using high-level procedural and / or object-oriented programming languages, and / or assembly / machine languages. Programming languages ​​include, but are not limited to, languages ​​such as Java, C++, Python, "C", or similar programming languages. The program code can be executed entirely on the user's computing device, partially on the user's device, partially on a remote computing device, or entirely on a remote computing device or server. In cases involving remote computing devices, the remote computing device can be connected to the user's computing device via any type of network, including a local area network (LAN) or a wide area network (WAN), or it can be connected to an external computing device (e.g., via the Internet using an Internet service provider).

[0169] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present invention. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram or flowchart, and combinations of blocks in a block diagram or flowchart, may be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0170] Furthermore, all actions involving the acquisition of information, signals, or data in this invention are carried out in compliance with the relevant data protection laws, regulations, and policies of the country where the invention is located, and with the authorization granted by the owner of the corresponding device.

[0171] Those skilled in the art will understand that the features described in the various embodiments and / or claims of the present invention can be combined or combined in various ways, even if such combinations or combinations are not explicitly described in the present invention. In particular, the features described in the various embodiments and / or claims of the present invention can be combined or combined in various ways without departing from the spirit and teachings of the present invention. All such combinations and / or combinations fall within the scope of the present invention.

[0172] The embodiments of the present invention have been described above. However, these embodiments are merely illustrative and not intended to limit the scope of the invention. Although various embodiments have been described above, this does not mean that the measures in the various embodiments cannot be used advantageously in combination. The scope of the invention is defined by the appended claims and their equivalents. Various substitutions and modifications can be made by those skilled in the art without departing from the scope of the invention, and all such substitutions and modifications should fall within the scope of the invention.

Claims

1. A voltage follower type driving circuit device applied to load driving, wherein, include: a power supply module (301) for providing an input voltage (V IN ) to the voltage follower type driving circuit arrangement (300); a boost module (302) connected to an output terminal of the power supply module (301) for providing a boosted voltage signal (V HV ) to the load (P) according to a feedback signal of the load (P) and an input voltage (V IN ); and An output module (303) is connected with the output end of the voltage boosting module (302), and is used for updating the driving electric signal (V OUT ) of the load (P) according to the feedback electric signal of the load (P), a preset reference signal and the voltage boosting electric signal (V HV ).

2. The voltage follower type driving circuit arrangement according to claim 1, wherein The boost module (302) includes a boost unit, wherein the boost unit includes a control switch unit (M0), a logic control unit (321), a first comparison unit (CMP1), and a second comparison unit (CMP2); The first comparison unit (CMP1) is configured to output a first control signal to the logic control unit (321) according to a comparison result between a corresponding incremental electric signal and the boost electric signal (V HV ) of the output module (303) based on the driving electric signal (V OUT ). The second comparison unit (CMP2) is configured to output a second control signal to the logic control unit (321) according to a comparison result between a preset peak value electric signal (I ZTC ) and a switching electric signal of the control switch unit (M0). When the control switch unit (M0) is in an open circuit state, the first control signal is configured to control the logic control unit (321) to output a first switch control signal to the gate of the control switch unit (M0), and the first switch control signal is configured to control the control switch unit (M0) to be in an on circuit state. When the control switch unit (M0) is in the on state, the second control signal is configured to control the logic control unit (321) to output a second switch control signal to the gate of the control switch unit (M0), and the second switch control signal is configured to control the control switch unit (M0) to be in the open state.

3. The voltage follower type driving circuit arrangement according to claim 2, wherein, The power module (301) includes: The voltage stabilizing unit (C IN ) has an input end connected with a preset power supply rail of the power supply module (301) and an output end grounded (GND), and is configured to provide a voltage stabilizing effect on an input voltage (V IN ) of the power supply module (301).

4. The voltage follower type driving circuit apparatus according to claim 2, wherein, The boost module (302) also includes: The charging unit (L0) has its input end connected to the preset power rail of the power module (301); one end of the boost unit is connected to the output end of the charging unit (L0), and the other end is grounded (GND).

5. The voltage follower type driving circuit arrangement according to claim 4, wherein, The boost module (302) also includes: The input terminal of the conducting unit (D0) is connected to the output terminal of the charging unit (L0), and the output terminal is connected to the input terminal of the output module (303).

6. The voltage follower type driving circuit arrangement according to claim 5, wherein, The boost module (302) also includes: Charging and discharging unit (C HV ), the input end is connected with the output end of the conducting unit (D0), the output end is grounded (GND), for outputting the boosted voltage signal (V HV ) to the output module (303).

7. The voltage follower type drive circuit device according to claim 6, wherein, The drain of the control switch unit (M0) is connected to the output terminal of the charging unit (L0), and the source is grounded (GND).

8. The voltage follower type drive circuit device according to claim 7, wherein, The output terminal of the logic control unit (321) is connected to the gate of the control switch unit (M0) and is used to provide a switch control signal to the gate of the control switch unit (M0) according to a preset logic control rule.

9. The voltage follower type drive circuit device according to claim 8, wherein, A first input of a first comparison unit (CMP1) is connected to the increment signal, a second input is connected to a boosted voltage signal (V HV ) of the output module (303), and an output is connected to a third input of the logic control unit (321).

10. The voltage follower type drive circuit device according to claim 9, wherein, A fifth input of a second comparison unit (CMP2) is connected to the switch signal at the drain output of the control switch unit (M0), a sixth input of the second comparison unit (CMP2) is connected to a preset peak signal (I ZTC ), and an output of the second comparison unit (CMP2) is connected to a fourth input of the logic control unit (321).

11. The voltage follower type driving circuit arrangement according to claim 2, wherein, The output module includes: A voltage stabilizing control unit (LDO) takes the boost voltage signal (V HV ) provided by the charge-discharge unit (C HV ) of the boost module (302) as an input power source, connects a seventh input end to a sampling voltage signal of the load (P), connects an eighth input end to a preset reference signal, and connects an output end to an input end of the load (P) to output a driving voltage signal (V OUT ) generated according to a comparison result of the sampling voltage signal and the preset reference signal.

12. The voltage follower type driving circuit arrangement according to claim 11, wherein, The output module (303) also includes: The digital-to-analog converter (DAC) has its output connected to the eighth input of the voltage regulator control unit (LDO) and is used to generate the preset reference signal from the received waveform digital signal through digital-to-analog conversion.

13. The voltage follower driver circuit arrangement of claim 12, wherein, The output module (303) also includes: The digital signal unit (331) has its output terminal connected to the input terminal of the digital-to-analog converter (DAC) and is used to provide the waveform digital signal to the digital-to-analog converter (DAC).

14. The voltage follower driver circuit arrangement of claim 13, wherein, The output module (303) also includes: The signal sampling unit is connected at one end to the output terminal of the voltage regulation control unit (LDO), and at the other end to ground (GND).

15. The voltage follower driver circuit arrangement of claim 14, wherein, The signal sampling unit includes: The first resistor (R3) is connected at one end to the output terminal of the voltage regulator control unit (LDO) and at the other end to the seventh input terminal of the voltage regulator control unit (LDO).

16. The voltage follower driver circuit arrangement of claim 15, wherein, The signal sampling unit further includes: The second resistor (R4) is connected at one end to the seventh input terminal of the voltage regulation control unit (LDO), and at the other end to ground (GND).

17. A control method of the voltage follower type drive circuit device according to any one of claims 1 to 16, wherein include: The control power module (301) provides an input voltage (V IN ) to the voltage follower type driving circuit arrangement (300). providing a boosted electrical signal (V HV ) to said load (P) by a boost module (302) as a function of a feedback electrical signal of said load (P) and of said input voltage as well as The control output module updates the drive electric signal (V OUT ) of the load (P) according to the feedback electric signal of the load (P), a preset reference signal and the boost electric signal (V HV ).

18. The control method of the voltage follower type drive circuit device according to claim 17, wherein, The boost module (302) includes a boost unit. A first comparison unit (CMP1) for controlling the voltage boosting unit outputs a first control signal to a logic control unit (321) of the voltage boosting unit according to a comparison result between a corresponding incremental electric signal of a drive electric signal (V OUT ) of the output module (303) and the voltage boosting electric signal (V HV ). When the control switch unit (M0) of the boost unit is in an open circuit state, the logic control unit (321) is controlled by the first control signal to output a first switch control signal to the gate of the control switch unit (M0). The first switch control signal is configured to control the control switch unit (M0) to be in an on circuit state.

19. The control method for the voltage follower type drive circuit device according to claim 18, wherein, A second comparison unit (CMP2) controls the voltage boosting unit, and outputs a second control signal to a logic control unit (321) of the voltage boosting unit according to a comparison result between a switch electric signal of the control switch unit (M0) and a preset peak value electric signal (I ZTC ). When the control switch unit (M0) of the boost unit is in the on state, the logic control unit (321) is controlled by the second control signal to output a second switch control signal to the gate of the control switch unit (M0). The second switch control signal is configured to control the control switch unit (M0) to be in the open state.

20. A computer program product comprising a computer program that, when executed by a processor, implements a control method for a voltage follower drive circuit device according to any one of claims 17-19.

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