Power management and power consumption control device and method for continuous blood glucose detection circuit

Abstract

The invention provides a power management and power consumption control device and method of a continuous blood glucose detection circuit. Relates to the technical field of continuous blood glucose detection, solves the problems of power consumption control and switching in the prior art, and is characterized in that a power input end of a charge pump is connected with an anode of an external power supply; the control input end of the charge pump is connected with a mode control signal end; the power output end of the charge pump is connected with the first control end of the power switch device; the switching signal control end of the charge pump is connected with the second control end of the power switching device through the delayer; the output end of the power switch device is connected with the working voltage input end, and the working voltage output end is connected with the grounding capacitor; the power output end of the charge pump is connected with the input end of the power-on reset module, the power switch switching signal end of the power-on reset module is connected with the power switch switching signal end of the charge pump, and different working modes can be achieved, so that power consumption control is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of continuous blood glucose detection, and in particular to a power management and power consumption control device and method for a continuous blood glucose detection circuit. Background Art

[0002] At present, diabetes is one of the most prevalent chronic diseases in the world, and the number of diabetic patients is large. The continuous glucose monitoring (CGM) system can reflect the changes in blood sugar throughout the day and effectively cover the detection blind spots. Effective blood sugar management can significantly improve patient prognosis and reduce the incidence of complications. In the existing CGM AFE (ActiveFront End, rectifier / feedback unit) chip, CP (CHARGE PUMP) can only work under a power supply of 1.5V or even lower, but the CGM system always requires a power supply of more than 2.6V; the overall power consumption requirement of CGM in low power mode is 6μA, but the power consumption of CP itself requires 5μA; in addition to powering CGM, CP also needs to power other modules (such as Bluetooth communication module), but the Bluetooth communication module is high power consumption (such as 5mA), and CP needs to switch between high power consumption and low power consumption; during the power-on process of CP, a large load may appear, making CP unable to charge normally to the expected voltage of 3V.

[0003] Based on the above reasons, a continuous blood glucose monitoring CGM AFE chip power consumption control circuit and method that can support 1.5V battery power supply is needed. Summary of the invention

[0004] A brief overview of the present invention is provided below in order to provide a basic understanding of certain aspects of the present invention. It should be understood that this overview is not an exhaustive overview of the present invention. It is not intended to identify key or important parts of the present invention, nor is it intended to limit the scope of the present invention. Its purpose is merely to present certain concepts in a simplified form as a prelude to a more detailed description discussed later.

[0005] In view of this, in order to solve the above problems, the present invention proposes a power management and power consumption control device and method for a continuous blood glucose detection circuit, which can realize switching between a low power consumption mode and a high power consumption mode.

[0006] The present invention provides a power management and power consumption control device for a continuous blood glucose detection circuit, comprising:

[0007] Charge pump, power-on reset module, delay device and power switch device;

[0008] The power input terminal of the charge pump is connected to the positive electrode of the external power supply; the control input terminal of the charge pump is connected to the mode control signal terminal;

[0009] The power output terminal of the charge pump is connected to the first control terminal of the power switch device; the switch signal control terminal of the charge pump is connected to the second control terminal of the power switch device through the delay device;

[0010] The output terminal of the power switch device is connected to the working voltage input terminal, and the working voltage output terminal is connected to the grounding capacitor;

[0011] The power output terminal of the charge pump is connected to the input terminal of the power-on reset module, and the power switch switching signal terminal of the power-on reset module is connected to the power switch switching signal terminal of the charge pump.

[0012] In a possible implementation, the power switch device is a PMOS.

[0013] In a possible implementation, the power consumption control device further includes: an OR gate circuit;

[0014] The off-chip control signal and the internal control signal are respectively connected to two input terminals of the OR gate, and the output terminal of the OR gate serves as the control signal terminal.

[0015] In a possible implementation, the power consumption control device further includes: a second delay device, a first low-dropout regulator, and a second low-dropout regulator;

[0016] The output terminal of the power switch device is respectively connected to the input power terminal of the first low-dropout regulator and the input power terminal of the second low-dropout regulator; the bandgap voltage output by the external power supply is respectively connected to the grounding terminal of the first low-dropout regulator and the grounding terminal of the second low-dropout regulator; the control signal terminal is connected to the control terminal of the second low-dropout regulator through the second delay device.

[0017] In a second aspect, the present invention further provides a power management and power consumption control method for a continuous blood glucose detection circuit, including:

[0018] Detecting a mode control signal, when the mode control signal indicates a low power consumption mode, the clock signal pauses working, the charge pump pauses charging, and the grounding capacitor at the working voltage output terminal is discharged to perform power output;

[0019] When the mode control signal indicates a high power consumption mode, the clock signal works at a first frequency, the charge pump starts to charge to a preset voltage, and the power output terminal of the charge pump is used for power output.

[0020] In a possible implementation, performing power output by discharging the grounding capacitor at the working voltage output terminal further includes:

[0021] When the output voltage of the charge pump reaches a preset charging threshold, the clock signal operates at a second frequency, and the charge pump is charged to the preset voltage.

[0022] In a possible implementation, before the method, the following also includes:

[0023] When the positive output of the external power supply outputs a supply voltage and the mode control signal indicates a high-power consumption mode, the clock signal operates at a second frequency, and the charge pump starts to charge;

[0024] When the output voltage of the charge pump reaches the startup voltage, the power-on reset module outputs a power switch switching signal, the clock signal operates at a first frequency, and after delaying a preset number of clock cycles by a delay device, a switch signal is output, so that the power switch device is turned on and supplies power to the working voltage input terminal.

[0025] In a possible implementation, the first frequency is greater than the second frequency.

[0026] In a possible implementation, the delay period of the delay device is 4 - 32 clock cycles of the first frequency.

[0027] The power management and power consumption control device and method of the continuous blood glucose detection circuit of the present invention utilize a charge pump (CHARGE PUMP, abbreviated as CP) to charge a power supply voltage of 1.5V or even lower to 3V to meet the power requirements of the continuous blood glucose detection system; in this application, the CP can be in different working modes. When the continuous blood glucose detection system requires low power consumption, the CP itself is in a low-frequency clock mode and an intermittent working mode, reducing the average power consumption of the CP itself to 2 μA. When the CP needs to provide a large load externally, through a control signal, a high-frequency clock mode and a continuous working mode are started. In this application, the working mode of the CP can also be controlled by other signals through an off-chip mode control interface CP_HP_EX (default is pulled up to the power supply by a resistor and is at a high level).

[0028] Through the following detailed description of the best embodiments of the present invention in conjunction with the drawings, these and other advantages of the present invention will become more obvious. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention can be better understood by referring to the descriptions given below in conjunction with the drawings, in which the same or similar reference numerals are used in all the drawings to denote the same or similar components. The drawings, together with the following detailed description, are included in this specification and form a part of this specification, and are used to further illustrate the preferred embodiments of the present invention and to explain the principles and advantages of the present invention. In the drawings:

[0030] Figure 1It is a schematic diagram showing the power management and power consumption control device of the continuous blood glucose detection circuit according to an embodiment of the present invention;

[0031] Figure 2 It is a schematic diagram showing the power management and power consumption control device of the continuous blood glucose detection circuit according to an embodiment of the present invention;

[0032] Figure 3 It is a flowchart showing the power management and power consumption control method of the continuous blood glucose detection circuit according to an embodiment of the present invention;

[0033] Figure 4 It is a timing diagram showing the power-on and operation of an embodiment of the present invention.

[0034] Those skilled in the art should understand that the elements in the drawings are shown only for simplicity and clarity, and are not necessarily drawn to scale. For example, the dimensions of some elements in the drawings may be enlarged relative to other elements to help improve the understanding of the embodiments of the present invention. Detailed Embodiments

[0035] In the following, exemplary embodiments of the present invention will be described in conjunction with the drawings. For the sake of clarity and conciseness, not all features of the actual embodiments are described in the specification. However, it should be understood that many implementation-specific decisions must be made during the development of any such actual embodiment in order to achieve the specific goals of the developer, for example, to comply with those limitations related to the system and business, and these limitations may vary with different embodiments. In addition, it should also be understood that although the development work may be very complex and time-consuming, for those skilled in the art who benefit from the present disclosure, such development work is only a routine task.

[0036] Here, it should also be noted that in order to avoid obscuring the present invention with unnecessary details, only the device structures closely related to the solution according to the present invention are shown in the drawings, and other details less related to the present invention are omitted. As Figure 1 shown, an embodiment of the present invention provides a power management and power consumption control device for a continuous blood glucose detection circuit, including:

[0037] A charge pump CP, a power-on reset module POR, a delay device Delay, and a power switch device;

[0038] The power input terminal of the charge pump CP is connected to the positive pole of the external power supply VBAT; the control input terminal of the charge pump CP is connected to the mode control signal terminal CP_HP_EN;

[0039] The power output terminal CPOUT of the charge pump CP is connected to the first control terminal of the power switch device; the switch signal control terminal of the charge pump CP is connected to the second control terminal of the power switch device through the delay unit Delay;

[0040] The output terminal of the power switch device is connected to the input terminal of the working voltage VDD, and the working voltage output terminal is connected to the grounding capacitor CAP;

[0041] The power output terminal of the charge pump CP is connected to the input terminal of the power-on reset module POR, and the power switch switching signal terminal PSW of the power-on reset module POR is connected to the power switch switching signal terminal of the charge pump CP.

[0042] In the embodiment of the present invention, a charge pump (CHARGE PUMP, CP) is used to charge a power supply of 1.5V or even lower to 3V; wherein, the charge pump CP can implement different working modes. When the continuous blood glucose detection system requires low power consumption, CP itself is in a low-frequency clock mode and an intermittent working mode, reducing the average power consumption of CP itself to 2μA. When CP needs to provide a large load externally, through a control signal, the high-frequency clock mode and the continuous working mode are started in advance. At this time, the average power consumption of CP itself is 20μA; through the off-chip mode control interface CP_HP_EX (default is pulled up to the power supply by a resistor and is at a high level), other signals are used to control the working mode of CP; during the power-on process of CP, before being fully charged to the predetermined voltage, the power switch device is not started to conduct. After the power-on reset module POR detects the expected voltage that has been charged, CP is switched to the high-frequency clock, and then after delaying for a certain time through the delay unit, the power switch device is turned on to supply power to the continuous blood glucose detection system, ensuring the normal power-on of the continuous blood glucose detection system.

[0043] In the embodiment of the present invention, the power switch device is a PMOS. It can also be an NMOS or other power switches.

[0044] As Figure 2 shown, in the embodiment of the present invention, the power consumption control device further includes: an OR gate circuit;

[0045] The off-chip control signal and the internal control signal are respectively connected to the two input terminals of the OR gate, and the output terminal of the OR gate serves as the control signal terminal.

[0046] In the embodiments of the present invention, the control method of the mode control signal terminal CP_HP_EN is added. By using an OR gate circuit, power consumption control is achieved for multiple lines simultaneously. In the embodiments of the present invention, taking two lines as an example, CP_HP_EX is an external control signal, which is used to access the control signal for controlling whether CP is in the high-power consumption mode outside the continuous blood glucose detection system. CP_HP_INT is an internal control signal of CGM. After these two signals pass through the OR gate circuit, the mode control signal CP_HP_EN is obtained to control the working mode of CP.

[0047] As Figure 2 shown, in the embodiments of the present invention, the power consumption control circuit further includes: a second delay device, a first low-dropout regulator, and a second low-dropout regulator;

[0048] The output ends of the power switch devices are respectively connected to the input power supply ends of the first voltage difference regulator and the input power supply end of the second low-dropout regulator; the bandgap voltage Vbg output by the external power supply is respectively connected to the grounding ends of the first voltage difference regulator and the second low-dropout regulator; the control signal terminal is connected to the control end of the second low-dropout regulator through the second delay device.

[0049] In the embodiments of the present invention, in order to avoid the ripple generated on the VDD signal due to the performance of CP itself, which affects the high-precision measurement of CGM, the first low-dropout regulator and the second low-dropout regulator are provided. Among them, the model of the first low-dropout regulator can be LDO2P4VLP, and the model of the second low-dropout regulator can be LDO2P4VHP, which is beneficial to providing a more stable power supply for the CGM system.

[0050] Figure 2 Among them, LDO_HP_EN is the delay signal of CP_HP_EN, and the delay time is adjustable by the system, generally set to 8 - 128 high-frequency clocks. Vbg is the bandgap voltage output by VBAT power supply.

[0051] As Figure 3 shown, the embodiments of the present invention also provide a power management and power consumption control method for a continuous blood glucose detection circuit, including step S110 - step S120.

[0052] Step S110, detecting the mode control signal. When the mode control signal indicates the low-power consumption mode, the clock signal pauses working, the charge pump pauses charging, and the grounding capacitor at the working voltage output end is discharged for power output;

[0053] Step S120, when the mode control signal indicates the high-power consumption mode, the clock signal works at the first frequency, the charge pump starts to charge to the preset voltage, and the power output end of the charge pump is used for power output.

[0054] In the embodiment of the present invention, the power output by discharging the grounding capacitor at the working voltage output terminal in step S110 further includes:

[0055] When the output voltage of the charge pump reaches a preset charging threshold, the clock signal works at a second frequency, and the charge pump is charged to a preset voltage.

[0056] In the embodiment of the present invention, before step S110, it further includes:

[0057] When the external power supply positive electrode outputs a supply voltage and the mode control signal indicates a high-power consumption mode, the clock signal works at a second frequency, and the charge pump starts to charge;

[0058] When the output voltage of the charge pump reaches the startup voltage, the power-on reset module outputs a power switch switching signal, the clock signal works at a first frequency, and after delaying a preset clock cycle by a delay device, a switch signal is output, so that the power switch device is turned on and supplies power to the working voltage input terminal.

[0059] In the embodiment of the present invention, the first frequency is greater than the second frequency.

[0060] In the embodiment of the present invention, the delay period of the delay device is 4 - 32 clock cycles of the first frequency.

[0061] Next, taking Figure 4 as an example, the process of power consumption control of a continuous blood glucose detection chip supporting 1.5V battery power supply in the embodiment of the present invention is described:

[0062] Startup phase 1: Power on VBAT. When the CP_HP_EN signal is high, at the same time, the low-frequency clock (about 600KHz) starts, and CP starts to charge;

[0063] Startup phase 2: After charging CPOUT to 2.6V, POR (POWER ON RESET power-on reset) outputs a high level PSW (POWER SWITCH power switch switching signal), the CP clock switches to the high-frequency clock (about 1800KHz), and after delaying a certain clock, the PCTRL signal is pulled low;

[0064] Startup phase 3: After the PCTRL clock is pulled low, Figure 1 the POWER PMOS (power switch device) in is turned on to supply power to VDD;

[0065] Low-power consumption phase 5: When the system works in the low-power consumption mode, at this time, the CP_HP_EN signal is low, the clock does not work, CP does not charge, at this time, the system is maintained by the capacitor CAP (10uF) outside VDD, and CPOUT starts to drop;

[0066] Low power consumption stage 6: When CPOUT drops to 2.7V, CP starts to charge with the low-frequency clock until it reaches 3V.

[0067] Low power consumption stage 7: Repeat the steps of stage 5. When Figure 1 the CP_HP_EN signal in the middle is high, the low power consumption stage ends.

[0068] High power consumption stage 8: Figure 1 When the CP_HP_EN signal in the middle is high, start to charge with the high-frequency clock until it reaches 3V.

[0069] High power consumption stage 9: When in the high power consumption mode, CP is in the high-frequency clock and continuous working mode, providing the power supply ability for the large load of VDD.

[0070] It should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0071] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0072] In the present application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0073] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these modifications and variations.

[0074] Although the present invention has been described in terms of a limited number of embodiments, those skilled in the art, having the benefit of the foregoing description, will appreciate that other embodiments can be contemplated within the scope of the invention as thus described. In addition, it should be noted that the language used in this specification has been principally selected for readability and instructional purposes and not to limit or define the inventive subject matter. Accordingly, many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the appended claims. For the scope of the present invention, the disclosure herein is illustrative and not restrictive, and the scope of the invention is defined by the appended claims.

Claims

1. A power management and power consumption control device for a continuous blood glucose detection circuit, characterized in that Comprising: A charge pump, a power-on reset module, a delay unit, and a power switch device; The power input terminal of the charge pump is connected to the positive electrode of the external power supply; the control input terminal of the charge pump is connected to the mode control signal terminal; The power output terminal of the charge pump is connected to the first control terminal of the power switch device; the switch signal control terminal of the charge pump is connected to the second control terminal of the power switch device through the delay unit; The output terminal of the power switch device is connected to the working voltage input terminal, and the working voltage output terminal is connected to the ground capacitor; The power output terminal of the charge pump is connected to the input terminal of the power-on reset module, and the power switch switching signal terminal of the power-on reset module is connected to the power switch switching signal terminal of the charge pump.

2. The power consumption control device according to claim 1, wherein The power switch device is a PMOS.

3. The power consumption control device according to claim 1, characterized in that, Further comprising: An OR gate circuit; The off-chip control signal and the internal control signal are respectively connected to the two input terminals of the OR gate, and the output terminal of the OR gate serves as the control signal terminal.

4. The power consumption control device according to claim 1, wherein Further comprising: A second delay unit, a first low-dropout regulator, and a second low-dropout regulator; The output terminal of the power switch device is respectively connected to the input power terminal of the first low-dropout regulator and the input power terminal of the second low-dropout regulator; the bandgap voltage output by the external power supply is respectively connected to the ground terminal of the first low-dropout regulator and the ground terminal of the second low-dropout regulator; the control signal terminal is connected to the control terminal of the second low-dropout regulator through the second delay unit.

5. A power management and power consumption control method for a continuous blood glucose detection circuit, characterized in that, Comprising: A detection mode control signal, when the mode control signal indicates the low-power mode, the clock signal pauses working, the charge pump pauses charging, and the ground capacitor at the working voltage output terminal is discharged for power output; When the mode control signal indicates the high-power mode, the clock signal works at a first frequency, the charge pump starts to charge to a preset voltage, and the power output terminal of the charge pump is used for power output.

6. The power consumption control method according to claim 5, wherein The power output by discharging the ground capacitor at the working voltage output terminal further comprises: When the output voltage of the charge pump reaches the preset charging threshold, the clock signal works at a second frequency, and the charge pump charges to the preset voltage.

7. The power consumption control method according to claim 5, wherein Before the method, further comprising: When the positive electrode of the external power supply outputs a supply voltage and the mode control signal indicates the high-power mode, the clock signal works at a second frequency, and the charge pump starts to charge; When the output voltage of the charge pump reaches the start voltage, the power-on reset module outputs a power switch switching signal, the clock signal works at a first frequency, and after delaying a preset clock period by the delay unit, a switch signal is output, so that the power switch device is turned on and supplies power to the working voltage input terminal.

8. The power consumption control method according to claim 6, wherein The first frequency is greater than the second frequency.

9. The power consumption control method according to claim 7, characterized in that, The delay period of the delay unit is 4 - 32 clock cycles of the first frequency.

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