Blood pressure measurement integrated control circuit, chip, method and electronic equipment

Abstract

The invention relates to a blood pressure measurement integrated control circuit, a chip, a method and electronic equipment, belongs to the technical field of blood pressure measurement, solves the problem that a blood pressure measurement device in the prior art cannot meet the requirements of ultrathin miniaturization and accurate measurement, and comprises an algorithm circuit, a pump driving circuit and an external system interface circuit, wherein the algorithm circuit comprises an algorithm module and an algorithm module driving circuit, and the algorithm module is integrated into an algorithm module chip and provides a driving signal and a PWM (Pulse Width Modulation) wave signal; the pump driving circuit is connected with the algorithm module and an external piezoelectric pump interface, receives a driving signal and a PWM wave signal from the algorithm module, generates an output voltage and provides the output voltage to the external piezoelectric pump interface; the external system interface circuit is connected with the algorithm module and comprises a level conversion circuit for providing signal transmission between the algorithm module and an external system; the pump driving circuit comprises a driving module and a boosting part.

Description

Technical Field

[0001] The present invention relates to the technical field of blood pressure measurement, and particularly to an integrated control circuit for blood pressure measurement, a chip, a method and an electronic device. Background Art

[0002] In the prior art, relatively large blood pressure measurement devices such as cuff-type devices are usually used for blood pressure measurement. However, there is an increasing demand for more miniaturized, portable and wearable blood pressure measurement methods. When a micro piezoelectric pump is applied to a blood pressure measurement device (such as a blood pressure measurement watch), the volume of the blood pressure measurement device is reduced to a certain extent. However, in such a blood pressure measurement device, a large area of driving circuit is required to vibrate and drive the piezoelectric element, and the driving circuit needs to occupy a large area and space, so that the blood pressure measurement device still cannot meet the requirements of miniaturization and easy wearing.

[0003] Chinese Patent Application for Invention, Publication No. CN105476618A, Invention Title "A Wrist-Arm Type Electronic Sphygmomanometer and Blood Pressure Measurement Method", discloses a wrist-arm type electronic sphygmomanometer, including a wrist and arm band air path interface connected to a wristband or cuff, a pressure sensor connected to the wrist and arm band air path interface, a microcontroller connected to the pressure sensor, an air pump control circuit, a solenoid valve control circuit and a display screen respectively connected to the microcontroller. Among them, both the air pump control circuit and the solenoid valve control circuit need to occupy a relatively large space, resulting in a large size of the overall control circuit and unable to meet the requirements of a miniaturized wearable measurement device.

[0004] Chinese Patent Application for Invention, Publication No. CN101536901A, Invention Title "Blood Pressure Measurement Circuit", discloses a blood pressure measurement circuit for a cuff-type blood pressure measurement device, including a processor, an analog-to-digital conversion circuit, a digital interface circuit, a protection differential amplifier circuit, an air pump and solenoid valve interface circuit, a first driving circuit and other large circuit structures. Therefore, the overall blood pressure measurement circuit has a large size and is difficult to be used in a micro blood pressure measurement device. In addition, the blood pressure measurement circuit does not have a boost control function for a piezoelectric pump.

[0005] Chinese Patent Application for Invention, Publication No. CN115607128A, Invention Title "Smart Watch and Blood Pressure Measurement Method", discloses a smart watch, which includes a Bluetooth chip as a control chip. The control chip determines the blood pressure data of the user at the smart watch end according to heart sound signals, electrocardiogram signals and pulse signals, and is prone to problems such as complex task management, excessive memory requirements and memory overflow during the calculation process.

[0006] Therefore, the existing blood pressure measurement control methods have the following limitations and deficiencies.

[0007] 1. The pump drive system in the current blood pressure measurement device is composed of an MCU, multiple drive circuits, a control circuit, and peripheral devices for the MCU, resulting in an overly large area of the assembled drive control circuit, making it difficult to miniaturize and integrate in wearable devices, unable to achieve ultra-thin stacking, and not conducive to integrated applications in small wearable devices (such as smart watches, blood pressure measurement watches, etc.).

[0008] 2. In the micro-pump drive system of the existing blood pressure measurement device, a Bluetooth chip is usually used for operation, which easily causes problems such as complex task management, excessive memory requirements, and memory overflow. Especially when the screen is refreshed at high speed, there will be a memory contention situation between the micro-pump drive and the blood pressure detection algorithm and the GUI (Graphical User Interface), resulting in a complex RTOS system (Real-Time Operating System) and low stability of the blood pressure watch.

[0009] 3. Most of the existing blood pressure watches are used by older people. This group of people are often not proficient in using smart devices and are prone to improper operation, resulting in phenomena such as continuous contraction and non-deflation of the airbag, and excessive squeezing of the measurement site, causing blood vessel necrosis.

[0010] Therefore, there is a need in this technical field for a blood pressure measurement control method that is ultra-thin and miniaturized, has accurate measurement, high safety, and is convenient to use. Summary of the Invention

[0011] To solve the above problems, according to an embodiment of the present invention, there is provided a blood pressure measurement integrated control circuit, chip, method, and electronic device, which integrate a drive module and an algorithm module in the same circuit and are co-packaged in the same chip, enabling the blood pressure measurement integrated control circuit to be integrated in a piezoelectric pump, effectively reducing the overall area and volume of the electromechanical device and improving the integration degree of the piezoelectric pump.

[0012] A blood pressure measurement integrated control circuit provided according to an embodiment of the present invention is characterized in that it is used to control an external piezoelectric pump and includes: an algorithm circuit, a pump drive circuit, and an external system interface circuit; Wherein, the algorithm circuit includes an algorithm module and an algorithm module drive circuit, and the algorithm module is integrated into an algorithm module chip to provide a drive signal and a PWM wave signal; The pump drive circuit is connected to the algorithm module and the external piezoelectric pump interface, receives the drive signal and the PWM wave signal from the algorithm module, generates an output voltage, and provides it to the external piezoelectric pump interface; The external system interface circuit is connected to the algorithm module and includes a level conversion circuit to provide signal transmission between the algorithm module and an external external system; And wherein, the pump drive circuit includes a drive module and a boost section; The driving module is integrated into a driving module chip, which has a boost driving function and controls the boost section based on the PWM wave signal received from the algorithm module to generate a boosted voltage; and has a power driving function, receives the boosted voltage from the boost section, and transmits the corresponding output voltage to the external piezoelectric pump interface.

[0013] Optionally, the integrated control circuit for blood pressure measurement further includes: a pressure circuit, an acceleration circuit, and a debugging circuit; Wherein, the pressure circuit is connected to the algorithm module and includes a pressure sensor to provide pressure data to the algorithm module; The acceleration circuit is connected to the algorithm module and includes an acceleration sensor to provide acceleration data to the algorithm module; The debugging circuit is connected to the algorithm module and includes a serial wire debugging circuit for programming and debugging the algorithm module; The algorithm module calculates the blood pressure value based on the received pressure data and acceleration data.

[0014] Optionally, the boost section of the pump driving circuit includes: a first driving diode, a first driving inductor, and a first driving capacitor; Wherein, the positive electrode of the first driving diode is connected to the first driving inductor, and the negative electrode of the first driving diode is connected to the first driving capacitor.

[0015] Optionally, the boost section further includes a first driving transistor, which is connected between the first driving diode and the first driving capacitor of the boost section, for receiving the system current and transmitting it to the first driving diode and the first driving capacitor.

[0016] Optionally, the driving module of the pump driving circuit includes: an enable terminal pin, a control pin, an input pin, a feedback pin, and an output terminal pin; Wherein, the enable terminal pin and the control pin of the driving module are connected to the algorithm module to receive driving signals from the algorithm module; The input pin of the driving module is connected to the algorithm module to receive the PWM wave signal from the algorithm module; The feedback pin of the driving module is connected to the boost section to receive the boosted voltage from the boost section; The output terminal pin of the driving module is connected to the external piezoelectric pump interface to provide an output voltage to the piezoelectric pump interface to control the piezoelectric pump.

[0017] Optionally, the driving module of the pump driving circuit further includes a switch pin, which is connected to the boost section to output a control signal to the boost section.

[0018] Optionally, the pump driving circuit further includes a feedback circuit for providing a reference voltage to the driving module, and the feedback circuit includes: a first coupling resistor, a first voltage dividing resistor, a second voltage dividing resistor, and a feedback capacitor; Wherein, one end of the first coupling resistor is connected to the algorithm module and the other end is connected to the feedback capacitor; The first voltage dividing resistor and the second voltage dividing resistor are connected in series and then connected in parallel with the feedback capacitor, and the circuit connection section between the first voltage dividing resistor and the second voltage dividing resistor is connected to the driving module.

[0019] A chip of a blood pressure measurement integrated control circuit according to another embodiment of the present invention, the chip is connected to an external system interface circuit, an algorithm module driving circuit, and a boosting section, and provides an output voltage to an external piezoelectric pump interface; and the algorithm module chip, the driving module chip, and a storage module are integrated in the chip.

[0020] An electronic device for blood pressure measurement according to another embodiment of the present invention, the electronic device includes the chip and a peripheral circuit, and the peripheral circuit includes the algorithm module driving circuit, a boosting section, an external system interface circuit, a pressure circuit, an acceleration circuit, and a debugging circuit.

[0021] A method for blood pressure measurement according to another embodiment of the present invention includes the following steps: S100, turn on the switch, the algorithm module of the blood pressure measurement integrated control circuit starts, and reads user information and a blood pressure measurement instruction via the external system interface circuit; S110, the algorithm module sends a driving signal to the driving module of the pump driving circuit to drive the operation of the algorithm module; S120, the algorithm module sends a PWM wave signal to the driving module, and the driving module generates a control signal based on the received PWM wave signal and sends it to the boosting section to control the boosting section to boost the voltage; S130, the feedback circuit of the pump driving circuit provides a reference voltage to adjust the boosted voltage output by the boosting section and provides it to the driving module, and the driving module outputs a corresponding output voltage to the piezoelectric pump interface connected to the pump driving circuit to control the inflation of the piezoelectric pump connected to the pump driving circuit; S140, the algorithm module receives the data measured by the pressure sensor of the pressure circuit and the acceleration sensor of the acceleration circuit; S150, the algorithm module calculates the blood pressure value by using the data measured by the pressure sensor and the acceleration sensor; S160, the algorithm module outputs the calculated blood pressure value as a calculation result via the external system interface circuit.

[0022] Compared with the prior art, a blood pressure measurement integrated control circuit, chip, method and electronic device provided according to an embodiment of the present invention have at least the following beneficial effects.

[0023] 1. The charging and deflation of the piezoelectric pump can be controlled through the algorithm module and the control module of the blood pressure measurement integrated control circuit, and the data measured by the pressure sensor and the acceleration sensor can be measured. Then, the blood pressure value can be calculated by the algorithm module, so that the blood pressure value can be obtained only through a single blood pressure measurement integrated control circuit without additional circuits, which can effectively improve the integration degree.

[0024] 2. The structure of the blood pressure measurement integrated control circuit is simplified and has a small area, effectively reducing the overall electromechanical area and volume. The pump drive circuit uses the output of a bipolar PWM wave signal, has the boost characteristics of small inductance and high efficiency, is suitable for small-volume integration, and has less heat generation.

[0025] 3. The pump drive circuit in the blood pressure measurement integrated control circuit charges the capacitor based on the PWM wave signal, and then divides the voltage through the precision resistor in the feedback circuit to realize the further precise adjustment of the output voltage by the reference voltage. This design method has the advantages of low cost and small volume (area), and can accurately control the output voltage.

[0026] 4. The blood pressure measurement integrated control chip adopts a solution including bare die packaging (bare chip packaging) of the MCU (micro control unit) as the algorithm module, the drive module chip and SRAM (static random access memory), which can greatly reduce the area of the drive algorithm circuit, reduce the area by more than 50%, and the obtained blood pressure measurement integrated control chip can be further integrated into the micro piezoelectric pump without occupying a separate space, enabling the blood pressure watch assembled by the blood pressure measurement integrated control chip to achieve a stack of less than 13 mm. The blood pressure measurement integrated control chip has an independent operation control ability, and the safety of blood pressure measurement can be greatly improved. The cooperation between the drive module chip and the algorithm module MCU can greatly improve the safety margin. Even if any one of the algorithm module MCU and the drive module chip fails, the air can be released instantly, meeting the requirements of high safety margin for medical devices. The blood pressure measurement integrated control circuit has a variety of peripheral interfaces such as I2C (Integrated Circuit Bus), 2-way serial ports, SPI (Serial Peripheral Interface), JLINK, etc. In addition to providing drive control for the micro piezoelectric pump, it also provides data interaction between the peripheral sensor and the algorithm module MCU, realizes a small volume, can perform efficient blood pressure measurement, and can be decoupled from the algorithm module MCU, facilitating the independent development of the algorithm and the system respectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required in the embodiments. By referring to the accompanying drawings, the features and advantages of the present invention can be more clearly understood. The accompanying drawings are schematic and should not be construed as imposing any limitations on the present invention. For those of ordinary skill in the art, other accompanying drawings can be obtained based on these drawings without creative efforts.

[0028] Figure 1 It is a structural diagram of a blood pressure measurement integrated control circuit provided according to the first embodiment of the present invention.

[0029] Figure 2 It is a circuit diagram of a pump drive circuit in the blood pressure measurement integrated control circuit provided according to the first embodiment of the present invention.

[0030] Figure 3 It is a circuit diagram of a debugging circuit in the blood pressure measurement integrated control circuit provided according to the first embodiment of the present invention.

[0031] Figure 4 It is a circuit diagram of a pneumatic circuit in the blood pressure measurement integrated control circuit provided according to the first embodiment of the present invention.

[0032] Figure 5 It is a wiring diagram of a blood pressure measurement integrated control chip provided according to the second embodiment of the present invention.

[0033] Figure 6 It is a schematic diagram of a blood pressure measurement integrated control chip provided according to the second embodiment of the present invention.

[0034] Figure 7 It is a schematic diagram of an electronic device including a blood pressure measurement integrated control chip provided according to the third embodiment of the present invention.

[0035] Description of the reference numerals: 100. Blood pressure measurement integrated control circuit; 110. Algorithm circuit; 112. Algorithm module; 120. Pump drive circuit; 122. Drive module; 125. Boosting section; 130. Pneumatic circuit; 132. Pneumatic sensor; 140. Acceleration circuit; 150. Debugging circuit; 160. External system interface circuit; 170. Storage module; 180. Piezoelectric pump interface; 200, Blood pressure measurement integrated control chip; 300, Electronic device. Detailed implementation manner

[0036] In order to more clearly understand the above objects, features and advantages of the present invention, the present invention will be further described in detail below with reference to the drawings and specific implementation manners. It should be noted that, without conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0037] In the following description, many specific details are set forth in order to fully understand the present invention, but the present invention can also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0038] The following provides a detailed description of a blood pressure measurement integrated control circuit, chip, method and electronic device according to an embodiment of the present invention with reference to the drawings.

[0039] Embodiment 1 As Figures 1 to 4 shown, a blood pressure measurement integrated control circuit 100 is provided according to a first embodiment of the present invention. The blood pressure measurement integrated control circuit 100 can be used in a blood pressure measurement device (for example, a blood pressure measurement watch, a cuff-type blood pressure measurement device, etc.), accurately control the inflation and deflation of the airbag by a piezoelectric pump in the blood pressure measurement device, and calculate the measured data to obtain a blood pressure value.

[0040] As Figure 1As shown, the integrated control circuit 100 for blood pressure measurement provided in this embodiment includes: an algorithm circuit 110, a pump drive circuit 120, and an external system interface circuit 160. Among them, the algorithm circuit 110 includes an algorithm module 112 and an algorithm module drive circuit connected to the algorithm module 112. The algorithm module 112 is connected to the external system interface circuit 160 to receive and read external information and blood pressure measurement instructions via the external system interface circuit 160, and output blood pressure measurement results via the external system interface circuit 160. The algorithm module 112 is connected to the pump drive circuit 120 to provide it with a drive signal and a PWM (pulse width modulation) signal. The pump drive circuit 120 is connected to an external piezoelectric pump interface 180 to control the piezoelectric pump to inflate and deflate the airbag. The algorithm module drive circuit includes an algorithm power supply circuit for powering the algorithm module 112 and a crystal oscillator, and the crystal oscillator provides a clock signal for the algorithm module 112. Optionally, the voltage range provided by the system power supply SYS_VCC in this embodiment can be 3.5V to 4.4V, and the output current ≧ 310mA. In this embodiment, the algorithm module 112 can be integrated into an algorithm module chip, for example, it can be a microcontroller (MCU). Optionally, the integrated control circuit 100 for blood pressure measurement may further include a pressure circuit 130 and an acceleration circuit 140, which are connected to the algorithm module 112 and used to provide data for air pressure measurement and acceleration measurement to the algorithm module 112. Optionally, the integrated control circuit 100 for blood pressure measurement may further include a debugging circuit 150, which is connected to the algorithm module 112 and used to program and / or debug the algorithm module 112. Optionally, the external system interface circuit 160, which is connected to the algorithm module 112, provides communication between the algorithm module 112 and the external system.

[0041] Figure 2 is a circuit diagram of the pump drive circuit 120 of the integrated control circuit 100 for blood pressure measurement provided in the first embodiment of the present invention, which shows the connection relationship of the pump drive circuit 120 in this embodiment. As Figure 2As shown, in this embodiment, the pump drive circuit 120 includes a drive module 122 and a boost section 125 that are connected to each other. In this embodiment, the drive module 122 can be integrated into a drive module chip. The boost section 125 is a boost circuit and can include a first drive diode D1, a first drive inductor L1, and a first drive capacitor C13. Among them, the positive electrode of the first drive diode D1 is connected to the first drive inductor L1, and the negative electrode of the first drive diode D1 is connected to the first drive capacitor C13. The other end of the first drive inductor L1 opposite to the first drive diode D1 is connected to the system power supply SYS_VCC. Optionally, the boost section 125 may further include a first drive transistor Q1. The first drive transistor Q1 receives an input current from the system power supply SYS_VCC and transmits it to the first drive diode D1 and the first drive capacitor C13 of the boost section 125. The input end of the first drive transistor Q1 is connected to the negative electrode of the first drive diode D1. The first drive transistor Q1 can be a P-channel field effect transistor or a PNP bipolar transistor. Optionally, the boost section 125 may further include a third coupling resistor R7, and the third coupling resistor R7 is connected between the output of the boost section 125 and the drive module 122.

[0042] Continuing to refer to Figure 2 , in this embodiment, the pump drive circuit 120 may further include a feedback circuit, which is connected to the algorithm module 112 and the drive module 122 of the algorithm circuit 110, receives a PWM wave signal from the algorithm module 112, processes it to obtain a reference voltage and outputs it to the drive module 122, so as to perform feedback regulation on the output voltage. The feedback circuit includes a first coupling resistor R2, a first voltage dividing resistor R3, a second voltage dividing resistor R5, and a feedback capacitor C6. Among them, one end of the first coupling resistor R2 is connected to the algorithm module 112 from which it receives the PWM wave signal, and the other end is connected to the feedback capacitor C6 to charge the feedback capacitor C6; the first voltage dividing resistor R3 and the second voltage dividing resistor R5 are connected in series and then connected in parallel with the feedback capacitor C6 to provide a voltage dividing function. The drive module 122 is connected to the connection circuit segment between the first voltage dividing resistor R3 and the second voltage dividing resistor R5 to receive the reference voltage. The feedback circuit charges the feedback capacitor C6 based on the PWM wave signal provided by the algorithm module 112 to the feedback circuit, then performs precise resistance voltage division through the first voltage dividing resistor R3 and the second voltage dividing resistor R5, and outputs it to the drive module 122 to change the reference voltage, and can further precisely adjust the output voltage. Optionally, the feedback circuit may further include a second coupling resistor R6, and the second coupling resistor R6 is connected in the connection circuit segment between the second voltage dividing resistor R5 and the drive module 122.

[0043] In this embodiment, the drive module 122 of the pump drive circuit 120 may have a boost drive function and a power drive function. As Figure 2As shown, the drive module 122 may include a voltage input pin (e.g., VIN), an enable pin (e.g., ENA, ENB), a control pin (e.g., CTRL), an output pin (e.g., OUTA, OUTB), an input pin (e.g., INA, INB), a switch pin (e.g., SW), a feedback pin (e.g., FB), etc. By connecting the output pins (e.g., OUTA, OUTB) of the drive module 122 to the external piezoelectric pump interface 180, the generated output voltage can be provided to the piezoelectric pump, thereby controlling the charging and discharging of the piezoelectric pump and providing a power driving function.

[0044] As Figure 2 As shown, in this embodiment, the voltage input pin (e.g., VIN) of the drive module 122 is connected to the system power supply SYS_VCC to receive the input current from the system power supply SYS_VCC. The enable pins (e.g., ENA, ENB) and the control pin (e.g., CTRL) of the drive module 122 are connected to the algorithm module 112 in the algorithm circuit 110, so as to receive a high-level driving signal from the algorithm module 112 to drive the drive module 122.

[0045] The input pins (e.g., INA, INB) of the drive module 122 are connected to the algorithm module 112 in the algorithm circuit 110, and are used to receive the PWM wave signal from the algorithm module 112, so as to generate a control signal based on the PWM wave signal to control the boosting of the boosting section 125 and provide a boosting driving function. The switch pin (e.g., SW) of the drive module 122 is connected to the connection circuit segment between the first driving diode D1 and the first driving inductor L1 of the boosting section 125, and is used to output a control signal from the drive module 122 to the boosting section 125 to accurately control the boosting and bucking of the boosting section 125. Furthermore, the drive module 122 drives and controls the piezoelectric pump. The control of the piezoelectric pump can be, for example, to control the boosting and bucking of the piezoelectric element in the piezoelectric pump to achieve precise control of the piezoelectric pump.

[0046] The feedback pin (e.g., FB) of the drive module 122 is connected to the output of the boosting section 125 and the feedback circuit. Specifically, it is connected to the output end of the first driving diode D1 of the boosting section 125, and is also connected to the connection circuit segment between the first voltage dividing resistor R3 and the second voltage dividing resistor R5 of the feedback circuit, and is used to receive the voltage adjusted by the reference voltage through the feedback circuit, so as to further accurately adjust the output voltage.

[0047] The settings of the drive module 122 and the boosting section 125 have the advantages of low cost and small volume (area), and at the same time, the output voltage can be accurately controlled.

[0048] In this embodiment, the algorithm module 112 performs calculations according to the input instructions, generates a PWM wave signal with a corresponding duty cycle, and provides it to the drive module 122 and the feedback circuit in two paths, so as to accurately adjust the output voltage of the pump drive circuit 120 accordingly, and then control the charging and discharging of the connected piezoelectric pump.

[0049] Figure 3 FIG. 4 is a circuit diagram of the debugging circuit 150 of the blood pressure measurement integrated control circuit 100 provided according to an embodiment of the present invention, showing the connection relationship of the debugging circuit 150 in this embodiment. As Figure 1 and Figure 3 shown, in this embodiment, a debugging circuit 150 is connected to the periphery of the blood pressure measurement integrated control circuit 100, and the debugging circuit 150 is connected to the general interface of the algorithm module 112. The debugging circuit 150 may include a serial wire debugging circuit, which includes a serial data line and a serial clock line, and is connected to the algorithm module 112 in the algorithm circuit 110 through the serial data line and the serial clock line. Among them, the serial data line is used for reading and writing data, and the serial clock line provides the required clock signal. The debugging circuit 150 is a circuit for programming and debugging the algorithm module 112.

[0050] In addition, the external system interface circuit 160 includes a level conversion circuit for converting the signal level in the algorithm circuit 110 into the level required for the external system interface connected to the blood pressure measurement integrated control circuit 100 to ensure the correct transmission of signals between circuits. The level conversion circuit may be a TXRX level conversion circuit. The external system interface circuit 160 may include a user interface with the blood pressure system module and an external interface.

[0051] Figure 4 FIG. 5 is a circuit diagram of the air pressure circuit 130 of the blood pressure measurement integrated control circuit 100 provided according to the first embodiment of the present invention, showing the connection relationship of the air pressure circuit 4 in this embodiment. As Figure 4 shown, in this embodiment, the air pressure circuit 130 includes an air pressure sensor 132. The air pressure sensor 132 is connected to the algorithm module 112 in the algorithm circuit 110, and the algorithm module 112 reads the data measured by the air pressure sensor 132 for calculations in the algorithm module 112. Although not shown separately, it should be understood that the acceleration circuit 140 is similar to the air pressure circuit 130. The acceleration circuit 140 includes an acceleration sensor, and the acceleration sensor is connected to the algorithm module 112 in the algorithm circuit 110. The algorithm module 112 reads the data measured by the acceleration sensor for calculations in the algorithm module 112.

[0052] In this embodiment, the integrated blood pressure measurement control circuit 100 may be provided with peripheral interfaces such as I2C (Inter-Integrated Circuit Bus), two serial ports, SPI (Serial Peripheral Interface), and JLINK, etc., for connecting to the piezoelectric pump interface 180 to drive and control the micropump, and can also perform data interaction with peripheral sensors and the host MCU of the external system.

[0053] The working process of the integrated blood pressure measurement control circuit 100 provided according to this embodiment of the present invention is as follows. When starting to measure blood pressure, first, the algorithm module 112 of the algorithm circuit 110 receives the input measurement information from the external system interface via the external system interface circuit 160; after processing the received measurement information, the algorithm module 112 generates a PWM wave signal with a corresponding duty cycle, sends a high-level drive signal and the PWM wave signal to the drive module 122 of the pump drive circuit 120, and sends the PWM wave signal to the feedback circuit of the pump drive circuit 120; the drive module 122 generates a control signal based on the received PWM wave signal and sends it to the boost section 125 to control the boosting of the boost section 125; the boost section 125 provides the boosted voltage to the drive module 122 to obtain the output voltage; the feedback circuit generates a reference voltage based on the received PWM wave signal and provides it to the drive module to further adjust the output voltage, and then transports the output voltage to the piezoelectric pump interface 180 via the output terminal of the drive module 122 to control the piezoelectric pump to inflate. During the measurement process, the algorithm module 112 also reads the data of the pressure sensor in the pressure circuit 130 and the acceleration sensor in the acceleration circuit 140; after the measurement is completed, the algorithm module 112 calculates the read data to obtain the blood pressure value and outputs it via the external system interface circuit 160.

[0054] Embodiment 2 In Figures 5 to 6 In the second embodiment of the present invention as shown, a blood pressure measurement integrated control chip 200 is provided, including the algorithm module 112 and the drive module 122 of the first embodiment. Optionally, the blood pressure measurement integrated control chip 200 may further include a storage module 170. The blood pressure measurement integrated control chip 200 may adopt a bare die packaging solution including an MCU (algorithm module chip), a drive module chip, and SRAM, which can significantly reduce the area of the drive algorithm circuit. Figure 5 It is a schematic diagram of the blood pressure measurement integrated control chip 200 according to the second embodiment of the present invention. By integrating the algorithm module 112 and the drive module 122 in one chip, a high degree of integration of the core for piezoelectric pump control and calculation is achieved, so that only through the blood pressure measurement integrated control chip 200, the entire process of controlling the pump to inflate and calculating the blood pressure value can be completed independently.

[0055] As Figure 5 and Figure 6As shown in the figure, in this embodiment, the integrated blood pressure measurement control chip 200 after co-packaging includes an algorithm module 112, a driving module 122, and a storage module 170. The algorithm module driving circuit, the peripheral circuits in the pump driving circuit 120 (such as the boost section 125), the air pressure circuit 130, the acceleration circuit 140, the debugging circuit 150, and the external system interface circuit 160 are connected to the blood pressure measurement integrated control chip 200 peripherally. The blood pressure measurement integrated control chip 200 can also be connected to a peripheral chip driving circuit, and the chip driving circuit supplies power to the blood pressure measurement integrated control chip 200. The blood pressure measurement integrated control chip 200 can jointly form a blood pressure measurement integrated control circuit 100 with the debugging circuit 150, the external system interface circuit 160, the algorithm module driving circuit, the peripheral circuits in the pump driving circuit 120, the air pressure circuit 130, and the acceleration circuit 140. The output of the blood pressure measurement integrated control circuit 100 is connected to an external piezoelectric pump interface 180, and thus is connected to a piezoelectric pump, and can be used for blood pressure measurement. By including the blood pressure measurement integrated control chip 200, the integration degree of the blood pressure measurement integrated control circuit 100 is improved, so that fewer components are used in the circuit, the cost is reduced; and the voltage required to be provided by the blood pressure measurement integrated control chip 200 is lower, and it is not easily broken down during use, improving safety and reducing the failure rate.

[0056] As Figure 5 and Figure 6 shown in the figure, in this embodiment, the integrated blood pressure measurement control chip 200 is rectangular after co-packaging. The algorithm module 112 is arranged at the central position of the packaging substrate, the storage module 170 is arranged on the left side of the algorithm module 112, and the driving module 122 is arranged on the right side of the algorithm module 112. Among them, the storage module 170 is used to store information, data, etc., and is used to store the blood pressure calculation method firmware in this embodiment. As Figure 6 shown in the figure, optionally, the driving module 122 can include a boost driving part and a power driving part, which respectively provide a boost driving function and a power driving function.

[0057] Optionally, the length and width dimensions of the algorithm module 112 in the packaged blood pressure measurement integrated control chip 200 are 2702um×2434um, and the thickness is 100um; the length and width dimensions of the storage module 170 are 884um×852um, and the thickness is 100um; the length and width dimensions of the driving module 122 are 2800um×1400um to 3000um×3000um, and the thickness is 100um. Optionally, the driving module 122 uses 25um copper wire for wiring, and a total of 26 25um copper wires can be used. The algorithm module 112 and the storage module 170 use 18um copper wire for wiring, and a total of 70 18um copper wires can be used. The overall size of the blood pressure measurement integrated control chip 200 is 8mm×5mm, and the thickness is 0.7mm~0.75mm.

[0058] Embodiment 3 In Figure 7 An electronic device 300 is provided according to the third embodiment of the present invention as shown, including the blood pressure measurement integrated control chip 200 of the second embodiment. Optionally, the blood pressure measurement integrated control chip 200 may be integrated in the electronic device 300. Additionally optionally, a blood pressure measurement integrated control circuit 100 formed by integrating the blood pressure measurement integrated control chip 200 and its peripheral circuits may be integrated in the electronic device 300. The blood pressure measurement integrated control chip 200 is used to control blood pressure measurement. The overall volume of the blood pressure measurement integrated control chip 200 and the blood pressure measurement integrated control circuit 100 in the electronic device 300 is very small, and the electronic device 300 can implement blood pressure measurement.

[0059] Embodiment 4 A blood pressure measurement method is provided according to the fourth embodiment of the present invention. This method performs blood pressure measurement based on the blood pressure measurement integrated control circuit 100 provided in the above first embodiment, and includes the following steps.

[0060] S100, Turn on the switch and read the blood pressure measurement instruction and user information. In this step, the algorithm module 112 of the blood pressure measurement integrated control circuit 100 is started, and the user information is read via the external system interface circuit 160. Specifically, in this embodiment, after the user selects to start measuring blood pressure, the algorithm module 112 reads the user information from the external system interface via the external system interface circuit 160. Optionally, the user information in the external system interface may include the user's personal information and historical blood pressure measurement data. If the user selects the guest mode, only the information for starting the test is read.

[0061] S110, Send a drive signal. The algorithm module 112 of the blood pressure measurement integrated control circuit 100 sends a drive signal to the drive module 122 of the pump drive circuit 120 to drive the operation of the algorithm module. Specifically, the algorithm module 112 provides a high-level signal as a drive signal to the drive module 122 via the enable terminal pin and the control pin of the drive module 122 to drive the operation of the drive module 122.

[0062] S120. The algorithm module 112 sends a PWM wave signal to the drive module 122. The drive module generates a control signal based on the received PWM wave signal and sends it to the boost section to control the boost section to perform boosting. In this embodiment, the algorithm module 112 sends a PWM wave signal to the drive module 122 via the input pin of the drive module 122. The drive module 122 generates a control signal based on the received PWM wave signal, and sends it to the boost section via the switch pin to control the boost section to perform boosting and obtain the boosted voltage. Specifically, the boost section 125 of the pump drive circuit 120 includes a first drive inductor L1, a first drive diode D1, and a first drive capacitor C13. The switch pin of the drive module 122 is connected to the circuit connection segment between the first drive diode D1 and the first drive inductor L1, and is used to send the control signal generated based on the PWM wave signal received from the algorithm module 112 to the boost section to control the buck-boost of the boost section, so as to achieve precise control of the piezoelectric pump.

[0063] S130. The feedback circuit of the pump drive circuit 120 provides a reference voltage to regulate the boosted voltage output by the boost section and provides it to the drive module 122. The drive module 122 outputs the corresponding output voltage to the piezoelectric pump interface 180 connected to the pump drive circuit to control the air pumping of the piezoelectric pump connected to the pump drive circuit 120. Specifically, the algorithm module 112 sends a PWM wave signal to the feedback circuit of the pump drive circuit 120. The feedback circuit generates a reference voltage based on the received PWM wave signal to regulate the boosted voltage output by the boost section and provides it to the feedback pin of the drive module 122. The drive module 122 outputs the corresponding output voltage to the piezoelectric pump interface 180 connected to the pump drive circuit, thereby further precisely controlling the output voltage and achieving precise control of the air pumping of the piezoelectric pump.

[0064] S140. Measuring data. The algorithm module 112 receives the data measured by the pressure sensor of the pressure circuit 130 and the acceleration sensor of the acceleration circuit 140.

[0065] S150. The algorithm module 112 calculates the blood pressure value using the data measured by the barometric pressure sensor and the acceleration sensor. Specifically, the barometric pressure sensor measures the blood pressure value by sensing the pressure. When the piezoelectric pump is controlled to inflate the airbag, the barometric pressure sensor will detect the change in pressure and convert it into an electrical signal. During the blood pressure measurement, the airbag in the cuff or wristband will gradually inflate until the generated pressure exceeds the arterial pressure, causing the arterial blood flow to be temporarily blocked. Subsequently, the airbag in the cuff or wristband starts to deflate, and the barometric pressure sensor continuously monitors the change in the air pressure inside the cuff or wristband. When the pressure inside the cuff or wristband gradually decreases to a certain specific point, the arterial blood flow will pass through again, and at this time, an obvious pressure change waveform will be generated. By analyzing this waveform, the systolic blood pressure (high pressure) and diastolic blood pressure (low pressure) can be calculated. Specifically, the highest point in the waveform corresponds to the systolic blood pressure, and the lowest point in the waveform corresponds to the diastolic blood pressure. The acceleration sensor is used to detect the movement state of the wrist or arm to correct the measurement result.

[0066] S160. Output the result. The algorithm module 112 outputs the calculated blood pressure value as the calculation result via the external system interface circuit 160. The calculation result may include the diastolic blood pressure, systolic blood pressure, and heart rate value of the user's blood pressure.

[0067] All of the above optional technical solutions can be combined arbitrarily to form the optional embodiments of the present application, which will not be elaborated one by one here.

[0068] It should be understood that the magnitudes of the sequence numbers of the steps in the above embodiments do not mean the order of execution is prior or subsequent. The order of execution of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

[0069] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention.

Claims

1. A blood pressure measurement integrated control circuit, characterized in that: Used to control an external piezoelectric pump, including: an algorithm circuit, a pump driving circuit and an external system interface circuit; The algorithm circuit includes an algorithm module and an algorithm module driving circuit. The algorithm module is integrated into an algorithm module chip to provide a driving signal and a PWM wave signal. The pump driving circuit is connected to the algorithm module and an external piezoelectric pump interface, receives a driving signal and a PWM wave signal from the algorithm module, generates an output voltage and provides it to the external piezoelectric pump interface; The external system interface circuit is connected to the algorithm module and includes a level conversion circuit to provide signal transmission between the algorithm module and an external system; And wherein, the pump driving circuit includes a driving module and a boost unit; The driving module is integrated into a driving module chip, which has a boost driving function, controls the boost part based on the PWM wave signal received from the algorithm module to generate a boosted voltage; and has a power driving function, receives the boosted voltage from the boost part, and transmits the corresponding output voltage to an external piezoelectric pump interface.

2. The blood pressure measurement integrated control circuit according to claim 1, characterized in that: The blood pressure measurement integrated control circuit also includes: an air pressure circuit, an acceleration circuit and a debugging circuit; Wherein, the air pressure circuit is connected to the algorithm module and includes an air pressure sensor to provide air pressure data to the algorithm module; The acceleration circuit is connected to the algorithm module and includes an acceleration sensor to provide acceleration data to the algorithm module; The debugging circuit is connected to the algorithm module and includes a serial line debugging circuit for programming and debugging the algorithm module; The algorithm module calculates the blood pressure value based on the received air pressure data and acceleration data.

3. The blood pressure measurement integrated control circuit according to claim 1, characterized in that: The booster section of the pump driving circuit includes: a first driving diode, a first driving inductor and a first driving capacitor; The anode of the first driving diode is connected to the first driving inductor, and the cathode of the first driving diode is connected to the first driving capacitor.

4. The blood pressure measurement integrated control circuit according to claim 3, characterized in that: The boosting unit also includes a first driving tube, which is connected between the first driving diode and the first driving capacitor of the boosting unit and is used to receive the system current and transmit it to the first driving diode and the first driving capacitor.

5. The blood pressure measurement integrated control circuit according to claim 3, characterized in that: The driving module of the pump driving circuit comprises: an enable pin, a control pin, an input pin, a feedback pin and an output pin; The enable pin and control pin of the driving module are connected to the algorithm module to receive the driving signal from the algorithm module; The input pin of the driving module is connected to the algorithm module and receives the PWM wave signal from the algorithm module; The feedback pin of the driving module is connected to the boost part to receive the boosted voltage from the boost part; The output pin of the driving module is connected to an external piezoelectric pump interface, and provides an output voltage to the piezoelectric pump interface to control the piezoelectric pump.

6. The blood pressure measurement integrated control circuit according to claim 5, characterized in that: The driving module of the pump driving circuit further includes a switch pin connected to the voltage boosting part to output a control signal to the voltage boosting part.

7. The blood pressure measurement integrated control circuit according to claim 1, characterized in that: The pump driving circuit further comprises a feedback circuit for providing a reference voltage to the driving module, the feedback circuit comprising: a first coupling resistor, a first voltage dividing resistor, a second voltage dividing resistor and a feedback capacitor; Wherein, one end of the first coupling resistor is connected to the algorithm module and the other end is connected to the feedback capacitor; The first voltage-dividing resistor and the second voltage-dividing resistor are connected in series and then connected in parallel with the feedback capacitor, and the circuit connection section between the first voltage-dividing resistor and the second voltage-dividing resistor is connected to the driving module.

8. A chip based on the blood pressure measurement integrated control circuit according to any one of claims 1 to 7, characterized in that: The chip is connected to an external system interface circuit, an algorithm module driving circuit and a voltage boosting unit, and provides an output voltage to an external piezoelectric pump interface; and the algorithm module chip, the driving module chip and the storage module are integrated in the chip.

9. An electronic device based on the chip according to claim 8, characterized in that: The electronic device comprises the chip and a peripheral circuit, wherein the peripheral circuit comprises the algorithm module driving circuit, a voltage boosting unit, an external system interface circuit, an air pressure circuit, an acceleration circuit and a debugging circuit.

10. A method for measuring blood pressure based on the blood pressure measurement integrated control circuit according to any one of claims 1 to 7, comprising the following steps: S100, turning on the switch, the algorithm module of the blood pressure measurement integrated control circuit is started, and the user information and blood pressure measurement instructions are read through the external system interface circuit; S110, the algorithm module sends a driving signal to the driving module of the pump driving circuit to drive the algorithm module to work; S120, the algorithm module sends a PWM wave signal to the driving module, and the driving module generates a control signal based on the received PWM wave signal and sends it to the boost unit to control the boost unit to boost the voltage; S130, the feedback circuit of the pump driving circuit provides a reference voltage, adjusts the boosted voltage output by the boosting unit, and provides the reference voltage to the driving module, and the driving module outputs the corresponding output voltage to the piezoelectric pump interface connected to the pump driving circuit to control the piezoelectric pump connected to the pump driving circuit to pump air; S140, the algorithm module receives data measured by the air pressure sensor of the air pressure circuit and the acceleration sensor of the acceleration circuit; S150, the algorithm module calculates the blood pressure value using the data measured by the air pressure sensor and the acceleration sensor; S160, the algorithm module outputs the calculated blood pressure value as a calculation result via the external system interface circuit.

Images