Circuit for collecting temperature of battery cell, power supply device and recorder

Abstract

The embodiment of the utility model provides a circuit for collecting the temperature of a battery cell, a power supply device and an electrocardio recorder, and the circuit for collecting the temperature of the battery cell comprises a divider resistor which is connected with a thermistor in the battery cell in series at a node A and is configured to perform voltage division with the thermistor; the following circuit is configured to follow the voltage change of the node A to obtain a voltage signal; the voltage division signal output end is connected with the output end of the follower circuit and is configured to output the voltage signal, and the voltage signal is used for obtaining the temperature of the battery cell. By adopting the circuit for collecting the temperature of the battery cell, on one hand, power consumption can be saved, on the other hand, the temperature of the battery cell at more temperature points can be monitored, and finally accurate control over the temperature of the battery cell is achieved.

Description

Technical Field

[0001] The present application relates to the field of circuits. Specifically, embodiments of the present application relate to a circuit, a power supply device, and a recorder for collecting the temperature of a battery cell. Background Art

[0002] The charging management chip is used to control and manage the charging process of the rechargeable battery. It is responsible for monitoring and managing each link of battery charging to ensure safe and efficient charging of the battery.

[0003] The charging management chip of the related technology integrates a temperature monitoring function. By obtaining the battery cell temperature, the charging strategy can be automatically adjusted or charging can be stopped when the battery cell temperature exceeds certain set thresholds to prevent the rechargeable battery from overheating.

[0004] The temperature monitoring function of the charging management chip provided by the related art has at least the following technical defects: On the one hand, the temperature monitoring function directly integrated by the charging management chip of the related art consumes a lot of power and cannot meet the energy consumption requirements of devices with lower power consumption requirements. On the other hand, the temperature monitoring function of the charging management chip of the related art can only be used to monitor several temperature points (for example, 0°C and 45°C) and adjust the current at these discrete temperature points, and cannot accurately control and adjust charging parameters such as charging current according to the battery temperature. Utility Model Content

[0005] The purpose of the embodiments of the present application is to provide a circuit, a power supply device and a recorder for collecting the temperature of a battery cell. The circuit for collecting the temperature of a battery cell of the embodiments of the present application can save power consumption on the one hand, and on the other hand, can collect the temperature of the battery cells at more temperature points to ultimately achieve precise control of the charging process.

[0006] In a first aspect, an embodiment of the present application provides a circuit for collecting the temperature of a battery cell, the circuit comprising: a voltage-dividing resistor, connected in series with a thermistor inside the battery cell at a node A, and configured to divide a voltage with the thermistor; a follower circuit, configured to follow the voltage change of the node A to obtain a voltage signal; a voltage-dividing signal output terminal, connected to the output terminal of the follower circuit, and configured to output the voltage signal, wherein the voltage signal is used to obtain the battery cell temperature.

[0007] Some embodiments of the present application collect more battery cell temperatures through voltage division based on voltage divider resistors and follower circuits. On the one hand, this can save power consumption in temperature collection, and on the other hand, the battery charging process can be more accurately controlled based on the more collected temperatures.

[0008] In some embodiments, the follower circuit includes: a voltage divider signal amplifier, including a non-feedback input terminal, a feedback input terminal and an output terminal, wherein the non-feedback input terminal is connected to the A node, and the feedback input port is connected to the output terminal.

[0009] Some embodiments of the present application use an amplifier as a follower circuit to better follow the voltage change at the voltage divider node and obtain the battery cell temperature more accurately.

[0010] In some embodiments, the circuit also includes: at least two capacitors with different capacitance values, the at least two capacitors are connected in parallel to a B node and a ground terminal, wherein the B node is connected to a positive power supply input terminal of the voltage divider signal amplifier, and the positive power supply input terminal is configured to load a first voltage VCC.

[0011] Some embodiments of the present application protect operational amplifiers from external interference and decouple and reduce power supply noise through capacitors with different capacitance values.

[0012] In some embodiments, the at least two capacitors are a first capacitor and a second capacitor, wherein the first capacitor is a capacitor of 1 microfarad and the second capacitor is a capacitor of 0.1 microfarad.

[0013] In some embodiments, the circuit further includes: a filter resistor, one end of which is connected to the output end of the voltage divider signal amplifier and the other end is connected to the voltage divider signal output end; a filter capacitor, one end of which is connected to the voltage divider signal output end and the other end is grounded.

[0014] In some embodiments of the present application, an RC circuit is provided at the output end of the acquisition signal for filtering, signal shaping and protecting the back-end circuit.

[0015] In a second aspect, some embodiments of the present application provide a power supply device, comprising: a circuit as described in any embodiment of the first aspect; a rechargeable battery device, comprising a charging input pin, a charging ground pin, a thermistor inside the battery cell, and a temperature collection pin, wherein the circuit is connected to the temperature collection pin, and the temperature collection pin is led out from one end of the thermistor inside the battery cell; a charging management chip, comprising: a battery connection pin, connected to the charging input pin; and a power supply output pin, connected to a device or unit to be powered.

[0016] Some embodiments of the present application implement cell temperature acquisition through a temperature acquisition circuit connected to the temperature acquisition pin of the rechargeable battery, thereby avoiding defects such as high power consumption and low temperature control accuracy caused by directly using the existing temperature acquisition function of the charging management chip for temperature monitoring.

[0017] In some embodiments, the power supply device also includes: a first capacitor, a second capacitor and a first diode connected in parallel, the first capacitor, the second capacitor and the first diode are connected in parallel to a G node and a ground terminal; wherein the G node is a connection point between the battery connection pin and the charging input pin and the G node is configured to load a second voltage VBAT.

[0018] The embodiment of the present application can provide multiple protection mechanisms to ensure the safety and stability of the charging process by setting two capacitors and a diode at the connection between the charging management chip and the battery connection input pin of the rechargeable battery being charged.

[0019] In some embodiments, the power supply device also includes: a third capacitor, a fourth capacitor and a second diode connected in parallel, the third capacitor, the fourth capacitor and the second diode are connected in parallel to a C node and a ground terminal; wherein the C node is connected to the power supply output pin.

[0020] In some embodiments of the present application, two capacitors and a diode are arranged at the power supply output pin. The stability and reliability of the circuit can be improved through the combined use and connection method of these components.

[0021] In some embodiments, the power supply device also includes: a fuse, one end of which is connected to the positive electrode of the external power supply, and the other end is connected to the F node; a second diode, one end of which is connected to the F node, and the other end is grounded; a first resistor, one end of which is connected to the F node, and the other end is connected to the E node; three sixth capacitors, seventh capacitors and eighth capacitor input voltage pins connected in parallel between the E node and the ground, for receiving the charging voltage provided by the external power supply; a second resistor, one end of which is connected to the positive electrode of the second diode and the other end is connected to one end of the sixth capacitor, wherein the E node is configured to load a third voltage VExt, and the E node is connected to the voltage input pin of the charging management chip.

[0022] Some embodiments of the present application can at least achieve electrostatic protection by providing fuses, resistors, and capacitors, suppress high-frequency interference from static electricity, and absorb high-frequency capacitance of static electricity.

[0023] In a third aspect, some embodiments of the present application provide an electrocardiograph recorder, comprising: a power supply device as described in any embodiment of the second aspect; and a wireless electrocardiograph recording unit configured to receive finger pressure through two electrodes; wherein the power supply device is used to power the wireless electrocardiograph recording unit.

[0024] Some embodiments of the present application provide an electrocardiograph recorder, which is charged by the above-mentioned power supply device, which can not only improve the charging safety but also reduce the charging power consumption and thus increase the use time of the electrocardiograph recorder. In addition, the electrocardiograph recorder of some embodiments of the present application collects electrocardiograph signals by two electrodes, which can improve the convenience and accuracy of the electrocardiograph signals collected by the electrocardiograph recorder.

[0025] In some embodiments, the wireless ECG recording unit includes: an ECG signal acquisition preprocessing circuit, configured to acquire an initial ECG signal, and preprocess the acquired initial ECG signal and output it in a differential manner; an analog front-end processing circuit, configured to receive a signal output by the ECG signal acquisition circuit in a differential manner, and obtain a digital ECG signal based on the signal; and an output interface, configured to provide the digital electrical signal to a second processing unit.

[0026] Some embodiments of the present application can convert the collected ECG signals into digital signals through an ECG signal collection preprocessing circuit and an analog front-end processing circuit, thereby facilitating subsequent signal processing and transmission.

[0027] In some embodiments, the ECG signal acquisition preprocessing circuit includes: a first electrode sheet and a second electrode sheet, which are configured to receive finger touch and perform signal acquisition when the finger touches to obtain the initial ECG signal; a protection circuit, connected to the first electrode sheet and the second electrode sheet, configured to process the initial ECG signal to obtain a first initial ECG signal; a filtering circuit, connected to the protection circuit, configured to filter the first initial ECG signal to obtain a filtered ECG signal; a differential signal output circuit, connected to the filtering circuit, configured to output the filtered ECG signal in the differential manner.

[0028] Some embodiments of the present application output the ECG signal collected by the ECG signal collection preprocessing circuit through two electrode sheets, a protection circuit, a filtering circuit and a differential output circuit, thereby improving the accuracy of the collected ECG signal.

[0029] In some embodiments, the analog front-end processing circuit includes: an ECG acquisition signal amplifier, configured to amplify the filtered ECG signal to obtain an amplified ECG signal; and an analog-to-digital converter, configured to convert the amplified ECG signal from an analog signal to a digital signal to obtain the digital ECG signal.

[0030] Some embodiments of the present application obtain digital ECG signals that meet requirements by amplifying and digitally processing the collected ECG signals, thereby facilitating subsequent application and processing of the signals.

[0031] In some embodiments, the ECG recorder further includes: a storage unit configured to store the target ECG signal processed by the second processing unit and the time information of collecting the ECG signal; and a Bluetooth module configured to send the target ECG signal and corresponding time information to a terminal device.

[0032] Some embodiments of the present application store the collected ECG signals and the collection time information of the ECG signals by setting a storage unit, so that the ECG signals collected at different times can be displayed on the terminal device later.

[0033] In some embodiments, the wireless ECG recorder further includes: a button and a display unit.

[0034] In some embodiments of the present application, the entire ECG recorder can be turned on or off by a button provided on the ECG recorder, and information such as the collected ECG signal or actual charging process information can be displayed by a provided display unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 A schematic diagram of a power supply device and a circuit for collecting battery cell temperature provided in an embodiment of the present application;

[0037] Figure 2 A block diagram of the composition of the electrocardiograph provided in the embodiment of the present application;

[0038] Figure 3 One of the block diagrams of the wireless ECG recording unit provided in the embodiment of the present application;

[0039] Figure 4 This is the second block diagram of the composition of the wireless ECG recording unit provided in the embodiment of the present application. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0041] It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further defined or explained in subsequent figures. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance. The "connection" between two components described in the embodiments of this application includes both direct connection between the two devices and indirect connection between the two devices through another or several other devices.

[0042] As recorded in the background technology section, directly using the temperature monitoring function of the charging management chip provided by the relevant technology will result in high power consumption and cannot achieve precise control of the charging process. Therefore, at least in order to solve these technical problems, the embodiment of the present application does not use the NTC pin on the charging management chip to collect the battery cell temperature, but designs an independent circuit with lower power consumption and can continuously obtain temperature values ​​(i.e., a circuit for collecting the battery cell temperature). The circuit leads out a temperature collection pin at one end of the thermistor of the rechargeable battery, and uses a voltage divider resistor connected in series with the pin. The battery cell temperature of the charged battery is determined by obtaining the voltage value at the voltage divider point. The power consumption is lower and more temperature values ​​can be collected, thereby achieving the technical purpose of regulating the charging process according to more temperatures.

[0043] That is to say, the circuit for collecting the temperature of the battery cell provided in the embodiment of the present application adopts a voltage-dividing resistor and a thermistor NTC inside the battery to divide the voltage, and uses the electrical signal obtained after the voltage division to obtain the corresponding battery cell temperature. This is because if the battery temperature changes, the NTC resistance changes, and the voltage value of the corresponding NTC resistance and the voltage-dividing resistor will also change. The value is collected and transmitted to the microprocessor (for example, the first processing unit) through collection and calibration. The microprocessor can obtain the corresponding battery cell temperature according to the collected voltage value by looking up a table (for example, pre-generating a table that stores the mapping relationship between each voltage-dividing value and the battery cell temperature value corresponding to each voltage-dividing value) or fitting, and obtain a control parameter value according to the battery cell temperature fitting, and reversely set the charging current by setting the corresponding control interface. It should be noted that the microprocessor obtains the temperature value according to the collected value and obtains the control parameter corresponding to the charging current according to the temperature value, which belongs to the prior art. Those skilled in the art can refer to relevant materials to obtain relevant technical means as needed. In order to avoid repetition, no excessive description is made here.

[0044] Please see Figure 1 , Figure 1 A circuit for collecting battery cell temperature and a power supply device including the circuit are provided in some embodiments of the present application.

[0045] Let's first combine Figure 1The circuit 110 for collecting the temperature of a battery cell provided in some embodiments of the present application is exemplarily described. The circuit 110 for collecting the temperature of a battery cell includes: a voltage-dividing resistor, a follower circuit, and a voltage-dividing signal output terminal.

[0046] The voltage-dividing resistor is connected in series with the thermistor inside the battery cell at node A and is configured to divide the voltage with the thermistor. Figure 1 The voltage-dividing resistor R9 shown in the figure has one end for inputting a first DC voltage VCC (for example, the first DC voltage is 3V) and the other end connected to the A node. Through the A node, the voltage-dividing resistor R9 can be connected in series with the thermistor NTC (the unit is not shown) inside the rechargeable battery device.

[0047] The follower circuit is configured to follow the voltage change of the A node to obtain a voltage signal.

[0048] In some embodiments of the present application, the follower circuit is an amplifier. Figure 1 As shown, the follower circuit includes: a voltage divider signal amplifier AMP, the voltage divider signal amplifier includes a non-feedback input terminal (ie Figure 1 The amplifier's "+" input terminal), the feedback input terminal (i.e. Figure 1 The non-feedback input terminal is connected to the A node, and the feedback input port is connected to the output terminal.

[0049] It is understandable that some embodiments of the present application can better follow the voltage change at the voltage divider node and obtain the battery cell temperature more accurately by using an amplifier as a follower circuit.

[0050] The voltage division signal output terminal is connected to the output terminal of the follower circuit and is configured to output the voltage signal output by the follower circuit. Figure 1 As shown, the voltage-dividing signal output terminal Q node is connected to the follower circuit output terminal and the first processing unit, and is configured to transmit the voltage signal to the first processing unit. It should be noted that the voltage-dividing signal output terminal provides the collected voltage-dividing signal to the processing unit so that the processing unit can obtain the battery cell temperature according to the voltage signal and the existing algorithm or table lookup. Figure 1 As shown, the output end of the voltage division signal is the Q node.

[0051] It is not difficult to understand that some embodiments of the present application collect parameters related to the battery cell temperature through voltage-dividing resistors and follower circuits. This temperature collection can effectively avoid the problem of high power consumption and imprecise temperature collection caused by directly using the temperature collection function provided by the NTC pin of the existing charging management chip.

[0052] In order to protect the operational amplifier from external interference and for technical purposes such as decoupling and reducing power supply noise, some embodiments of the present application provide a circuit for collecting the battery cell temperature, which also includes a circuit arranged at the positive power input terminal of the voltage divider signal amplifier, and the circuit includes: at least two capacitors with different capacitance values, and the at least two capacitors are connected in parallel to the B node and the ground terminal, wherein the B node is connected to the positive power input terminal of the voltage divider signal amplifier, and the positive power input terminal is configured to load a first voltage VCC.

[0053] like Figure 1 The circuit shown in FIG. 1 is designed at the positive power supply input terminal of the voltage divider signal amplifier and includes: a first capacitor C75 and a second capacitor C76, which are connected in parallel at Figure 1 The node B of the capacitor is connected to the ground terminal, and the node B is connected to the positive power input terminal of the voltage-dividing signal amplifier, and the positive power input terminal is configured to load a first voltage VCC (for example, the first voltage VCC is 3V). For example, in some embodiments of the present application, the capacitance value of the first capacitor is 1 microfarad and the capacitance value of the second capacitor is 0.1 microfarad.

[0054] In order to shape the signal and protect the back-end circuit, some embodiments of the present application provide a circuit for collecting the battery cell temperature, which also includes: a filter resistor, one end of which is connected to the output end of the voltage divider signal amplifier, and the other end is connected to the voltage divider signal output end; a filter capacitor, one end of which is connected to the voltage divider signal output end, and the other end is grounded.

[0055] For example, Figure 1 As shown, the filter resistor R10 and the filter capacitor C77 are connected to the voltage-dividing signal output terminal Q, and the other end of the filter resistor is connected to the output end of the voltage-dividing signal amplifier, and the other end of the filter capacitor C77 is grounded.

[0056] It is not difficult to understand that some embodiments of the present application set an RC circuit at the output end of the acquisition signal for filtering, signal shaping and protecting the back-end circuit.

[0057] Combine the following Figure 1 The power supply device 100 provided in some embodiments of the present application is exemplified, and the power supply device 100 can provide a working voltage for a device that needs power (for example, an electrocardiograph recorder or an electronic blood pressure monitor, etc.).

[0058] Some embodiments of the present application provide a power supply device, such as Figure 1 The power supply device shown at least includes: a circuit 110 for collecting the temperature of a battery cell, a charging battery device 120 and a charging management chip 130 .

[0059] like Figure 1As shown, in some embodiments of the present application, the rechargeable battery device 120 includes a charging input pin 21, a charging ground pin 22, a thermistor inside the battery cell (not shown in the figure), and a temperature collection pin 23, wherein the circuit 110 for collecting the battery cell temperature is connected to the temperature collection pin 23, and the temperature collection pin 23 is led out from one end of the thermistor inside the battery cell of the rechargeable battery device 120.

[0060] That is to say, in order to implement the technical solution of the embodiment of the present application, it is necessary to lead out a temperature acquisition pin from one end of the thermistor of the battery to be charged, that is, the charging battery device, and then connect the temperature acquisition pin in series with the voltage divider resistor, and collect the voltage divider value at the series node, and then the processor can determine the battery cell temperature based on the voltage divider value.

[0061] like Figure 1 As shown, in some embodiments of the present application, the charging management chip 130 exemplarily includes: a battery connection pin BAT and a power output pin SYS, wherein the battery connection pin BAT is connected to the charging input pin 21 of the rechargeable battery device, and the power output pin SYS is connected to the device or unit to be powered, for example, the device to be powered can be an electrocardiograph or an electronic blood pressure monitor, etc.

[0062] It is not difficult to understand that some embodiments of the present application realize battery cell temperature acquisition through a temperature acquisition circuit connected to the temperature acquisition pin of the charged battery, which can avoid the defects of high power consumption and low temperature control accuracy caused by directly using the existing temperature acquisition function of the charging management chip for temperature monitoring.

[0063] In order to ensure the safety and stability of the charging process, Figure 1 As shown, in some embodiments of the present application, the power supply device 100 further includes: a first capacitor C71, a second capacitor C74 and a first diode D28 connected in parallel, wherein the first capacitor C71, the second capacitor C74 and the first diode D28 are connected in parallel to a G node and a ground terminal, the G node is a connection point between the battery connection pin BAT and the charging input pin 21, and the G node is configured to load a second voltage VBAT.

[0064] It is not difficult to understand that the embodiments of the present application can provide multiple protection mechanisms to ensure the safety and stability of the charging process by setting two capacitors and a diode at the connection between the charging management chip and the battery connection input pin of the rechargeable battery being charged.

[0065] In order to improve the stability and reliability of the circuit, such as Figure 1As shown, in some embodiments of the present application, the power supply device 100 further exemplarily includes: a third capacitor C48, a fourth capacitor C47 and a second diode D27 connected in parallel, wherein the third capacitor C48, the fourth capacitor C47 and the second diode D27 are connected in parallel to a C node and a ground terminal, and the C node is connected to the power supply output pin SYS.

[0066] It is not difficult to understand that in some embodiments of the present application, two capacitors and a diode are provided at the power supply output pin. The stability and reliability of the circuit can be improved through the combined use and connection method of these components.

[0067] In order to suppress the high-frequency interference of static electricity, absorb the high-frequency capacitance of static electricity, such as Figure 1 As shown, in some embodiments of the present application, the power supply device 100 further includes: a fuse F1, a second diode D1, a first resistor FB15, three parallel capacitors, a sixth capacitor C21, a seventh capacitor C100 and an eighth capacitor C46, ​​and a second resistor FB16, wherein one end of the fuse F1 is connected to the positive electrode of the external power supply and the other end is connected to the F node, one end of the second diode D1 is connected to the F node and the other end is grounded, one end of the first resistor FB15 is connected to the F node and the other end is connected to the E node, three parallel connections between the E node and the ground are the sixth capacitor C21, the seventh capacitor C100 and the eighth capacitor C46, ​​the input voltage pin (11, 12) is used to receive the charging voltage provided by the external power supply, and one end of the second resistor FB16 is connected to the positive electrode of the second diode and the other end is connected to one end of the sixth capacitor. It should be noted that the E node is configured to load the third voltage VExt, and the E node is connected to the voltage input pin IN of the charging management chip.

[0068] It is not difficult to understand that some embodiments of the present application can at least achieve electrostatic protection, suppress high-frequency interference from static electricity, and absorb high-frequency capacitance of static electricity by providing fuses, resistors, and capacitors.

[0069] It should be noted that in some embodiments of the present application, the charging management chip 130 is also provided with a voltage pin VDD, an interrupt trigger pin nINT, a first communication signal pin SDL, a second communication signal pin SCL and an NTC pin, etc. As described above, the embodiment of the present application does not use the temperature acquisition function of the NTC pin. This is because directly using this pin to realize temperature acquisition results in high power consumption of the device and insufficient temperature acquisition accuracy. Instead, Figure 1 The circuit for collecting the battery cell temperature realizes the battery cell temperature collection. Figure 1 The voltage pin VDD is also provided with a sixth capacitor C49 and a first voltage VCC, and Figure 1The interrupt trigger pin nINT is used to receive the interrupt pulse signal Charger nINT sent by the first processing unit or other processing units, the first communication signal pin SDL and the second communication signal pin SCL are used to receive the control signal provided by the first unit machine or other processing units, and these pins are connected to the internal processor or the first processing unit of the body (for example, the power supply device body), and the processor or the first processing unit controls the charging power management chip, receives the first charging control signal Charger SDA signal or the second charging control signal Charger SCL sent by the processor or the first processing unit, and Figure 1 A first pull-up resistor R6, a second pull-up resistor R7, and a third pull-up resistor R8 and a first voltage VCC connected to the pull-up resistors are also provided for the relevant pins. For example, the charging current, setting the charging current, overvoltage protection, undervoltage protection, and status reading can be read through the first communication signal pin SDL and the second communication signal pin SCL. Since the connection method of these pins and the implementation method of the relevant functions belong to the prior art, they will not be described in detail here.

[0070] Figure 2 Provided are electrocardiogram recorders according to some embodiments of the present application, the electrocardiogram recorders adopt Figure 1 The power supply device shown provides power.

[0071] like Figure 2 As shown, some embodiments of the present application provide an electrocardiograph recorder 200 , which includes: a power supply device 100 and a wireless electrocardiograph recorder 200 .

[0072] It should be noted that Figure 2 The wireless ECG recording unit 200 receives finger pressure through two electrode sheets, and the power supply device 100 is used to supply power to the wireless ECG recording unit 200. For example, Figure 1 The power supply device 100 supplies power to the wireless ECG recording unit 200 through its SYS pin. For the specific structure of the power supply device 100, reference can be made to the above description. To avoid repetition, the structure of the power supply device will not be described in detail here.

[0073] It is not difficult to understand that some embodiments of the present application provide an electrocardiograph recorder, which is charged by the above-mentioned power supply device, which can improve the charging safety and the use time of the electrocardiograph recorder. The electrocardiograph recorder of some embodiments of the present application collects electrocardiograph signals through two electrodes, thereby improving the accuracy of the electrocardiograph signals collected by the electrocardiograph recorder.

[0074] Combine the following Figure 3 as well as Figure 4 The wireless ECG recording unit 200 according to some embodiments of the present application is exemplified.

[0075] like Figure 3 As shown, the wireless ECG recording unit provided in some embodiments of the present application exemplarily includes: an ECG signal acquisition preprocessing circuit 210 , an analog front-end processing circuit 220 , and an output interface 230 .

[0076] The ECG signal acquisition preprocessing circuit 210 is configured to acquire an initial ECG signal, and preprocess the acquired initial ECG signal and output it in a differential manner.

[0077] For example, Figure 4 As shown, the ECG signal acquisition preprocessing circuit 210 of some embodiments of the present application exemplarily includes: a first electrode sheet 211, a second electrode sheet 212, a protection circuit 213, a filter circuit 214 and a differential signal output circuit 215, wherein the first electrode sheet 211 and the second electrode sheet 212 are configured to receive finger touch and perform signal acquisition when the finger touches to obtain the initial ECG signal, the protection circuit 213 is connected to the first electrode sheet and the second electrode sheet and the protection circuit is configured to process the initial ECG signal to obtain the first initial ECG signal, the filter circuit 214 is connected to the protection circuit and the filter circuit is configured to filter the first initial ECG signal to obtain a filtered ECG signal, and the differential signal output circuit 215 is electrically connected to the filter circuit and the differential signal output circuit is configured to output the filtered ECG signal in the differential manner.

[0078] It is not difficult to understand that some embodiments of the present application output the ECG signal collected by the ECG signal collection preprocessing circuit through two electrode sheets, a protection circuit, a filter circuit and a differential output circuit, thereby improving the accuracy of the collected ECG signal.

[0079] The analog front-end processing circuit 220 is configured to receive the signal output by the electrocardiogram signal acquisition circuit in a differential manner, and obtain a digital electrocardiogram signal according to the signal.

[0080] For example, Figure 4 As shown, the analog front-end processing circuit 220 of some embodiments of the present application exemplarily includes: an ECG signal amplifier 221 and an analog-to-digital converter 222, wherein the ECG acquisition signal amplifier is configured to amplify the filtered ECG signal to obtain an amplified ECG signal; the analog-to-digital converter is configured to convert the amplified ECG signal from an analog signal to a digital signal to obtain the digital ECG signal. It is not difficult to understand that some embodiments of the present application obtain a digital ECG signal that meets the requirements by amplifying and digitizing the acquired ECG signal, which facilitates the subsequent application and processing of the signal.

[0081] The output interface 230 is configured to provide the digital electrical signal output by the analog front-end processing circuit to the Figure 4 The second processing unit 170 shown in the figure processes the digital ECG signal to obtain the target ECG signal. For example, the second processing unit calculates the heart rate and other parameter values ​​(as an example of the target ECG signal) based on the collected ECG signal.

[0082] It is not difficult to understand that some embodiments of the present application can convert the collected ECG signals into digital signals through the ECG signal collection preprocessing circuit and the analog front-end processing circuit, which facilitates subsequent signal processing and transmission.

[0083] like Figure 4 As shown, the electrocardiograph provided in some embodiments of the present application further includes: a storage unit 240 , a Bluetooth module 250 , a button 260 and a display unit 270 .

[0084] The storage unit 240 is configured to store the target ECG signal processed by the second processing unit and the time information of collecting the ECG signal.

[0085] The Bluetooth module 250 is configured to send the target ECG signal and corresponding time information to the terminal device.

[0086] Button 260 is configured to turn on or off the electrocardiogram recorder.

[0087] The display unit 270 is configured to display the waveform of the acquired electrocardiographic signal.

[0088] Some embodiments of the present application store the collected ECG signals and the collection time information of the ECG signals by setting a storage unit, so as to subsequently display the ECG signals collected at different times, and facilitate statistical processing of the collected ECG signals. Some embodiments of the present application can turn on or off the entire instrument through a button set on the ECG recorder, and can display the collected ECG signals through a set display unit.

[0089] In order to perform statistical processing on the user's ECG signals at different times, the ECG recorder of some embodiments of the present application further exemplarily includes a real-time clock signal extraction unit.

[0090] The structure and working process of an electrocardiograph using some embodiments of the present application are exemplarily described below.

[0091] When using the electrocardiogram recorder of the embodiment of the present application, the user needs to touch the electrode sheet (i.e. Figure 4 The first motor sheet and the second electrode sheet) are used to detect, transmit and store the ECG data signal.

[0092] The electrocardiogram recorder of some embodiments of the present application includes: Figure 1 The power supply device, power supply, button, RTC real-time clock, ECG signal acquisition preprocessing circuit, analog front-end processing circuit, storage unit, display unit, data transmission unit (such as Bluetooth module), etc. are shown.

[0093] The power supply device of some embodiments of the present application controls the charging current of the battery in the rechargeable battery device according to the battery cell temperature collected by the circuit for collecting the battery cell temperature, so as to ensure the safety of battery charging. In addition, the charging management chip 130 of some embodiments of the present application supports charging overvoltage, overcurrent protection, over-discharge voltage, over-discharge current protection and other functions through the SDA pin or the SCL pin.

[0094] The ECG recorder of the embodiment of the present application supports external power supply, battery power supply or both. For example, the overall system power supply of the ECG recorder of some embodiments of the present application is 3.3V and 3V, the analog part is powered by 3.3V, and the digital part is powered by 3V.

[0095] For example, the button usage process of some embodiments of the present application is: 1) long press for three seconds to turn on or off; 2) short press to switch functions.

[0096] For example, the RTC real-time clock of some embodiments of the present application supports the storage and reading of real-time time.

[0097] For example, the working process of the ECG signal acquisition preprocessing circuit and the analog front-end processing circuit in some embodiments of the present application is as follows: after collecting weak human body electrical signals by pressing two electrodes with fingers, the signals are sequentially processed by the protection circuit and the filter circuit, and then transmitted to the analog front-end processing circuit in a differential manner. After the signal enters the analog front-end processing circuit, it is further amplified, and the amplified signal is converted to ADC inside the analog front end. The processed digital signal is transmitted to the processing unit (for example, Figure 4 of the second processing unit).

[0098] For example, in some embodiments of the present application, the ECG digital signal transmitted to the second processing unit is processed by an existing algorithm to obtain parameter values ​​such as heart rate, and the processed data is transmitted to the Bluetooth module BLE (Bluetooth Low Energy) through the serial port.

[0099] For example, some embodiments of the present application store the received ECG waveform data (i.e., the target ECG signal) processed by the second processing unit in a storage unit or a storage chip, and then read the real-time clock RTC (Real-Time Clock) time data. The received ECG waveform data and the read RTC time information are synchronized via Bluetooth transmission to a related application APP installed on a terminal device such as a mobile phone terminal (for example, the program can display the collected ECG waveform graph).

[0100] For example, in some embodiments of the present application, the display unit includes an OLED display screen, which is used to display at least one of the following information: displaying the charging process and power information; displaying fault information; displaying the timing during the ECG measurement process; displaying the number of saved ECG measurement data; displaying the connection status between the machine and the application APP on the terminal device, etc.

[0101] In several embodiments provided in the present application, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely schematic. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the devices, methods and computer program products according to multiple embodiments of the present application. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of a code, and the module, a program segment or a part of a code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart can be implemented with a dedicated hardware-based system that performs a specified function or action, or can be implemented with a combination of dedicated hardware and computer instructions.

[0102] In addition, the functional modules in the various embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.

[0103] If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium, including several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0104] The above description is only an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0105] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0106] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

Claims

1. A circuit for collecting battery cell temperature, characterized in that: The circuit comprises: A voltage-dividing resistor, connected in series with a thermistor inside the battery cell at a node A, and configured to divide voltage with the thermistor; A follower circuit is configured to follow the voltage change of the A node to obtain a voltage signal; The voltage division signal output terminal is connected to the output terminal of the follower circuit and is configured to output the voltage signal, wherein the voltage signal is used to obtain the battery cell temperature.

2. The circuit according to claim 1, characterized in that The follower circuit comprises: The voltage-dividing signal amplifier comprises a non-feedback input terminal, a feedback input terminal and an output terminal, wherein the non-feedback input terminal is connected to the A node, and the feedback input terminal is connected to the output terminal.

3. The circuit according to claim 2, characterized in that The circuit also includes: at least two capacitors with different capacitance values, the at least two capacitors are connected in parallel to a B node and a ground terminal, wherein the B node is connected to a positive power input terminal of the voltage divider signal amplifier, and the positive power input terminal is configured to load a first voltage VCC.

4. The circuit according to claim 3, characterized in that The at least two capacitors are a first capacitor and a second capacitor, wherein the first capacitor is a capacitor of 1 microfarad and the second capacitor is a capacitor of 0.1 microfarad.

5. The circuit according to claim 3 or 4, characterized in that The circuit further comprises: A filter resistor, one end of which is connected to the output end of the voltage-dividing signal amplifier, and the other end of which is connected to the output end of the voltage-dividing signal; A filter capacitor has one end connected to the voltage-divided signal output end and the other end grounded.

6. A power supply device, characterized in that: The power supply device comprises: A circuit as claimed in any one of claims 1 to 5; A rechargeable battery device, comprising a charging input pin, a charging ground pin, a thermistor inside the battery cell, and a temperature collection pin, wherein the circuit is connected to the temperature collection pin, and the temperature collection pin is led out from one end of the thermistor inside the battery cell; Charging management chip, including: A battery connection pin connected to the charging input pin; and Power supply output pin, connected to the device or unit to be powered.

7. The power supply device according to claim 6, characterized in that: The power supply device further includes: a first capacitor, a second capacitor and a first diode connected in parallel, wherein the first capacitor, the second capacitor and the first diode are connected in parallel to a G node and a ground terminal; The G node is a connection point between the battery connection pin and the charging input pin, and the G node is configured to load a second voltage VBAT.

8. The power supply device according to claim 7, characterized in that: The power supply device further includes: a third capacitor, a fourth capacitor and a second diode connected in parallel, wherein the third capacitor, the fourth capacitor and the second diode are connected in parallel to a C node and a ground terminal; Wherein, the C node is connected to the power supply output pin.

9. The power supply device according to claim 6, characterized in that: The power supply device further comprises: A fuse, one end of which is connected to the positive pole of the external power supply, and the other end is connected to the F node; A second diode, one end of which is connected to the F node and the other end of which is grounded; A first resistor, one end of which is connected to the F node, and the other end of which is connected to the E node; three sixth capacitors, a seventh capacitor and an eighth capacitor connected in parallel between the E node and the ground; a second resistor, one end of which is connected to the anode of the second diode and the other end of which is connected to one end of the sixth capacitor; An input voltage pin, used to receive a charging voltage provided by the external power source; The E node is configured to load a third voltage VExt, and the E node is connected to a voltage input pin of the charging management chip.

10. A recorder, characterized in that: The recorder comprises: The power supply device according to any one of claims 6 to 9; and a wireless ECG recording unit configured to receive finger pressure via two electrode pads; Wherein, the power supply device is used to supply power to the wireless ECG recording unit.

11. The recorder according to claim 10, characterized in that: The wireless ECG recording unit comprises: The ECG signal acquisition preprocessing circuit is configured to acquire an initial ECG signal, and preprocess the acquired initial ECG signal and output it in a differential manner; an analog front-end processing circuit, configured to receive the signal outputted by the electrocardiogram signal acquisition circuit in a differential manner, and obtain a digital electrocardiogram signal according to the signal; The output interface is configured to provide the digital ECG signal to the second processing unit.

12. The recorder according to claim 11, characterized in that The electrocardiogram signal acquisition preprocessing circuit comprises: The first electrode sheet and the second electrode sheet are configured to receive the finger touch and collect signals when the finger touches to obtain the initial electrocardiogram signal; a protection circuit connected to the first electrode sheet and the second electrode sheet, and configured to process the initial electrocardiogram signal to obtain a first initial electrocardiogram signal; a filter circuit connected to the protection circuit and configured to filter the first initial ECG signal to obtain a filtered ECG signal; The differential signal output circuit is connected to the filtering circuit and is configured to output the filtered ECG signal in the differential manner.

13. The recorder according to claim 12, characterized in that: The analog front-end processing circuit comprises: An ECG acquisition signal amplifier is configured to amplify the filtered ECG signal to obtain an amplified ECG signal; The analog-to-digital converter is configured to convert the amplified electrocardiographic signal from an analog signal to a digital signal to obtain the digital electrocardiographic signal.

14. The recorder according to claim 13, characterized in that: The recorder also includes: a storage unit configured to store the target ECG signal processed by the second processing unit and the time information of collecting the ECG signal; The Bluetooth module is configured to send the target ECG signal and corresponding time information to the terminal device.

15. The recorder according to claim 14, characterized in that The recorder also includes: a button and a display unit.

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