Body fat scale with ECG measurement function

Abstract

This utility model discloses a body fat scale with ECG measurement function, including a scale body and a handle. The scale body is equipped with a first power module, a first main control module, a foot electrode module, and a weighing module. The handle is equipped with a second power module, a second main control module, and a hand electrode module. The foot electrode module includes four foot electrodes, and the hand electrode module includes four hand electrodes. It also includes an ECG measurement module and a channel switching module. The channel switching module is connected to the hand electrode module and has a first state and a second state. The function of the hand electrode module is reused through the channel switching module. When the channel switching module is in the first state, the hand electrodes are connected to the first main control module and form a complete body fat measurement circuit with the foot electrodes. When the module is switched to the second state, the hand electrodes are connected to the ECG measurement module to form an ECG measurement circuit, which can conveniently collect the user's electrocardiogram data and meet the needs of cardiovascular health monitoring.

Description

Technical Field

[0001] This utility model relates to the field of body fat scales, and in particular to a body fat scale with ECG measurement function. Background Technology

[0002] In the field of health monitoring, body fat scales are common home health devices. Their core function is to measure human body impedance using bioelectrical impedance analysis (BIA) and combine this with weight data to calculate body composition parameters such as body fat percentage and muscle mass, meeting users' needs for monitoring basic health indicators. However, with increasing health awareness, the single function of body fat measurement can no longer fully cover user needs. More and more users hope to conveniently obtain cardiovascular health data such as heart rate and electrocardiogram (ECG) in a home setting to achieve multi-dimensional monitoring of their own health status.

[0003] However, existing technologies suffer from significant functional fragmentation: traditional body fat scales are only equipped with electrode modules for collecting human impedance (mostly foot electrodes, with some high-end products adding hand electrodes to improve measurement accuracy), enabling only basic parameter measurements such as body fat and weight; while ECG monitoring relies on specialized electrocardiogram (ECG) devices (such as home ECG machines, smart bracelets / watches, etc.). These devices are either bulky and complex to operate, or their measurement accuracy is limited by hardware configuration, making it difficult to deeply integrate with the usage scenarios of body fat scales. If users need to monitor body fat and ECG data simultaneously, they must purchase two separate devices, which not only increases economic costs but also presents problems such as inconvenient device storage and inability to manage data uniformly. Therefore, there is an urgent need for a body fat scale with ECG measurement capabilities to solve these problems. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a body fat scale with ECG measurement function.

[0005] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: a body fat scale with ECG measurement function, including a scale body and a handle. The scale body is provided with a first power module and a first main control module, a foot electrode module and a weighing module connected to the first power module. The handle is provided with a second power module and a second main control module and a hand electrode module connected to the second power module. The foot electrode module includes FVL electrode, FIL electrode, FVR electrode and FIR electrode. The hand electrode module includes HVL electrode, HIL electrode, HVR electrode and HIR electrode. It also includes an ECG measurement module and a channel switching module.

[0006] The foot electrode module is used to collect impedance parameters of the human lower limbs, and the hand electrode module is used to collect impedance parameters of the human upper limbs.

[0007] The weighing module is used to collect human body weight parameters;

[0008] The input end of the ECG measurement module is connected to the second main control module and the channel switching module, and the output end is connected to the first main control module.

[0009] The channel switching module is connected to the hand electrode module and has a first state and a second state;

[0010] The channel switching module can connect the HVL electrode, HIL electrode, HVR electrode, and HIR electrode to the first main control module when it is in the first state to form a body fat measurement circuit. Alternatively, the channel switching module can connect the HVL electrode, HIL electrode, and HIR electrode to the ECG measurement module when it is in the second state to form an ECG measurement circuit.

[0011] As a preferred embodiment of this utility model, the channel switching module includes relay chip U5 and relay chip U6. Pin 1 of relay chip U5 is connected to the VCC terminal, pin 8 of relay chip U5 is connected to the GND terminal, pin 3 of relay chip U5 is connected to one end of the HIR electrode, pins 2 and 7 of relay chip U5 are connected to the first main control module, pin 4 of relay chip U5 is connected to the ECG measurement module, pin 6 of relay chip U5 is connected to one end of the HVR electrode, and pin 5 of relay chip U5 is left floating.

[0012] Pin 1 of relay chip U6 is connected to the VCC terminal, pin 8 of relay chip U6 is connected to the GND terminal, pin 3 of relay chip U6 is connected to one end of the HIL electrode, pins 2 and 7 of relay chip U6 are connected to the first main control module, pins 4 of relay chip U6 and pins 5 of relay chip U5 are connected to the ECG measurement module, and pin 6 of relay chip U6 is connected to one end of the HVL electrode.

[0013] When the channel switching module is in the first state, pin 2 of relay chip U5 is connected to pin 3 of relay chip U5, pin 6 of relay chip U5 is connected to pin 7 of relay chip U5, pin 2 of relay chip U6 is connected to pin 3 of relay chip U6, and pin 6 of relay chip U6 is connected to pin 7 of relay chip U6.

[0014] When the channel switching module is in the second state, pin 3 of relay chip U5 is connected to pin 4 of relay chip U5, pin 3 of relay chip U6 is connected to pin 4 of relay chip U6, and pin 5 of relay chip U6 is connected to pin 6 of relay chip U6.

[0015] As one of the preferred embodiments of this utility model, the relay chip U5 and the relay chip U6 are designated as model G6K-2F-Y.

[0016] As a preferred embodiment of this utility model, the weighing module includes a weight sensor S+, a weight sensor S-, a weight sensor E+, a weight sensor E-, and capacitors C56-C58. The third pin of the weight sensor S+ is connected to the third pin of the weight sensor E-. The second pin of the weight sensor S+ is connected to the first main control module, one end of capacitor C56, and one end of capacitor C57. The first pin of the weight sensor S+ is connected to the third pin of the weight sensor E+. The second pin of the weight sensor E+ is connected to the first main control module. The first pin of the weight sensor E+ is connected to the first pin of the weight sensor S-. The second pin of the weight sensor S- is connected to the first main control module, the other end of capacitor C57, and one end of capacitor C58. The other ends of capacitors C56 and C58 are connected to the second pin of the weight sensor E-. The third pin of the weight sensor S- is connected to the first pin of the weight sensor E-.

[0017] In one of the preferred embodiments of this utility model, the ECG measurement module and the channel switching module are mounted on the handle.

[0018] In one of the preferred embodiments of this utility model, the handle is connected to the scale body by a transmission cable. A spool is provided inside the scale body, and the transmission cable is wound on the spool so that the transmission cable can be unwound from the spool and wound back up.

[0019] As one of the preferred embodiments of this utility model, the scale body is provided with an open storage slot, and the handle is housed in the storage slot.

[0020] As one of the preferred embodiments of this utility model, the handle is magnetically connected to the storage slot.

[0021] The beneficial effects of this invention are as follows: The channel switching module enables the reuse of the hand electrode module's functions, eliminating the need for separate electrodes for body fat and ECG measurements. When the channel switching module is in its first state, the hand electrode connects to the first main control module, forming a complete body fat measurement circuit with the foot electrode. This allows for accurate acquisition of impedance parameters of the upper and lower limbs, combined with weight data from the weighing module, to achieve high-precision analysis of body composition such as body fat percentage and muscle mass. When the module switches to its second state, the hand electrode connects to the ECG measurement module, forming an ECG measurement circuit. This facilitates the acquisition of the user's electrocardiogram data, meeting the needs of cardiovascular health monitoring. This design significantly simplifies the hardware structure, reduces the number of electrodes, lowers equipment production costs and assembly complexity, and avoids the operational inconvenience caused by multiple electrode switching, thus improving ease of use. Attached Figure Description

[0022] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0023] Figure 1 This is a schematic diagram of a body fat scale with ECG measurement function;

[0024] Figure 2 An exploded view of a body fat scale with ECG measurement function;

[0025] Figure 3 This is a block diagram illustrating the principle of a body fat scale with ECG measurement function.

[0026] Figure 4 This is the circuit schematic of the charging module;

[0027] Figure 5 This is the circuit schematic diagram of the first part of the first power supply module;

[0028] Figure 6 This is the circuit schematic diagram of the second part of the first power supply module;

[0029] Figure 7 This is the circuit schematic diagram of the first part of the first main control module;

[0030] Figure 8 This is the circuit schematic diagram of the second part of the first main control module;

[0031] Figure 9 This is the circuit schematic for the foot electrode module;

[0032] Figure 10 This is the circuit schematic of the weighing module;

[0033] Figure 11 Circuit schematic of the second power supply module

[0034] Figure 12 This is the circuit schematic diagram of the second main control module;

[0035] Figure 13 The circuit schematic of the ECG measurement module;

[0036] Figure 14 This is the circuit diagram of the hand electrode module;

[0037] Figure 15 This is the circuit schematic of the channel switching module;

[0038] Figure 16 This is the circuit schematic of the display module. Detailed Implementation

[0039] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0040] In the description of this utility model, "multiple" means two or more; "greater than," "less than," and "exceeding" are understood to exclude the stated number; "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features or their sequential relationship.

[0041] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0042] In this utility model, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to a fixed connection, a detachable connection, or an integral molding; they can refer to a mechanical connection; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0043] Reference Figures 1-16 A body fat scale with ECG measurement function includes a scale body 100 and a handle 200. The scale body 100 is provided with a first power module 110 and a first main control module 120, a foot electrode module 130 and a weighing module 140 connected to the first power module 110. The handle 200 is provided with a second power module 210 and a second main control module 220 and a hand electrode module 230 connected to the second power module 210. The foot electrode module 130 includes an FVL electrode 131, an FIL electrode 132, an FVR electrode 133 and an FIR electrode 134. The hand electrode module 230 includes an HVL electrode 231, an HIL electrode 232, an HVR electrode 233 and an HIR electrode 234. It also includes an ECG measurement module 300 and a channel switching module 400.

[0044] The foot electrode module 130 is used to collect impedance parameters of the human lower limbs, and the hand electrode module 230 is used to collect impedance parameters of the human upper limbs.

[0045] Weighing module 140 is used to collect human body weight parameters;

[0046] The input terminal of the ECG measurement module 300 is connected to the second main control module 220 and the channel switching module 400, and the output terminal is connected to the first main control module 120.

[0047] The channel switching module 400 is connected to the hand electrode module 230 and has a first state and a second state;

[0048] When the channel switching module 400 is in the first state, it can connect the HVL electrode 231, HIL electrode 232, HVR electrode 233 and HIR electrode 234 to the first main control module 120 to form a body fat measurement circuit. Alternatively, when the channel switching module 400 is in the second state, it can connect the HVL electrode 231, HIL electrode 232 and HIR electrode 234 to the ECG measurement module 300 to form an ECG measurement circuit.

[0049] In this utility model, reference is made to Figures 1-2 In a preferred embodiment of this utility model, the scale body 100 includes a shell 100a, an ITO conductive glass 100b, four conductive plates 100c, and a decorative cover 100d. The shell 100a has a cavity, in which a first control board 150, a display screen (display module 500), a battery 810, and a charging interface 820 are disposed. Four weight sensors (S+, S-, E+, E-) are evenly distributed on the bottom of the shell 100a. The ITO conductive glass 100b is mounted on the upper surface of the shell 100a, and four conductive areas are evenly distributed on the surface of the ITO conductive glass 100b, which respectively constitute an FVL electrode 131 and an FIL electrode 131. Electrode 132, FVR electrode 133, and FIR electrode 134, four conductive areas, are each connected to the first control board 150 via a conductive sheet 100c. The first control board 150 is connected to the battery 810, the charging interface 820, and the display screen (display module 500). The first power module 110, the first main control module 120, and the charging module 160 are mounted on the first control board 150. The charging module 160 is connected to the battery 810 and the charging interface 820, respectively. When the charging interface 820 is connected to an external power source, it can charge the battery 810. The voltage output by the battery 810 is converted by the first power module 110 and then used to power the subsequent circuits.

[0050] Furthermore, the handle 200 includes a housing 200a, HVL electrodes 231 and HIL electrodes 232 distributed on both sides of the front end of the housing 200a, and HVR electrodes 233 and HIR electrodes 234 distributed on both sides of the rear end of the housing 200a. The housing 200a has a cavity, in which a second control board 240 and a third control board 250 are disposed. A second power module 210 and a second main control module 220 are disposed on the second control board 240, and an ECG measurement module 300 and a channel switching module 400 are disposed on the third control board 250. The handle 200 is connected to the scale body 100 via a transmission cable 610. The transmission cable 610 can transmit the data collected by the hand electrodes on the handle 200 to the first control board 150. The first main control module 220 completes the data collection, calculation, analysis, and output, and finally displays it through the display module 500. The displayed content includes, but is not limited to, time, battery level, weight parameters, body fat parameters, ECG parameters, historical parameters, etc. Figure 2 In some embodiments, a spool 620 is provided inside the scale body 100, and the transmission cable 610 is wound on the spool 620 so that the transmission cable 610 is unwound from the spool 620 and wound back. The spool 620 can be an existing spool, which can be a manually unwound spool or an automatically unwound spool.

[0051] It should be noted that HVL electrode 231 is the voltage detection signal for left-hand bioimpedance measurement, HIL electrode 232 is the current excitation signal for left-hand bioimpedance measurement, HVR electrode 233 is the voltage detection signal for right-hand bioimpedance measurement, HIR electrode 234 is the current excitation signal for right-hand bioimpedance measurement, FVL electrode 131 is the voltage detection signal for left-foot bioimpedance measurement, FIL electrode 132 is the current excitation signal for left-foot bioimpedance measurement, FVR electrode 133 is the voltage detection signal for right-foot bioimpedance measurement, and FIR electrode 134 is the current excitation signal for right-foot bioimpedance measurement, thus forming a complete 8-electrode body fat detection system.

[0052] Reference Figures 1-2 In some embodiments, the scale body 100 is provided with a storage slot 700 with an opening 710, and the handle 200 is housed in the storage slot 700; preferably, the handle 200 is magnetically connected to the storage slot 700. This arrangement can store the handle 200 on the scale body 100, and together with the cable reel 620 for storing the transmission cable 610, it can prevent the handle 200 and the transmission cable 610 from becoming scattered.

[0053] When using the body fat scale, to measure body fat, the second main control module 220 sends a control signal to the channel switching module 400 via a switch or other means, causing the channel switching module 400 to enter a first state. When the channel switching module 400 is in the first state, the HVL electrode 231, HIL electrode 232, HVR electrode 233, and HIR electrode 234 will be connected to the first main control module 120. Simultaneously, the FVL electrode 131, FIL electrode 132, FVR electrode 133, and FIR electrode 134 on the scale body 100 will also be connected to the first main control module. Block 120 is connected to form a complete body fat measurement circuit. The first main control module 120 outputs the body fat parameters and displays them through the display module 500. When ECG measurement is required, the second main control module 220 sends a control signal to the channel switching module 400 through a switch or other means, causing the channel switching module 400 to enter a second state. When the channel switching module 400 is in the second state, the HVL electrode 231, HIL electrode 232, and HIR electrode 234 will be connected to the ECG measurement module 300. Among them, the HVL electrode 231 is the ECG RLD drive output, the HIL electrode 232 is the negative input of the ECG lead, and the HIR electrode 234 is the positive input of the ECG lead, forming a single-lead ECG measurement circuit. The collected data is transmitted to the ECG measurement module 300, and the first main control module 120 outputs the ECG parameters and displays them through the display module 500.

[0054] Reference Figure 15In some embodiments, the channel switching module 400 includes relay chip U5 and relay chip U6. Pin 1 of relay chip U5 is connected to VCC, pin 8 of relay chip U5 is connected to GND, pin 3 of relay chip U5 is connected to one end of HIR electrode 234, pins 2 and 7 of relay chip U5 are connected to the first main control module 120, pin 4 of relay chip U5 is connected to the ECG measurement module 300, pin 6 of relay chip U5 is connected to one end of HVR electrode 233, and pin 5 of relay chip U5 is left floating. Pin 1 of relay chip U6 is connected to VCC, pin 8 of relay chip U6 is connected to GND, pin 3 of relay chip U6 is connected to one end of HIL electrode 232, and pins 2 and 7 of relay chip U6 are connected to the first main control module 120. The main control module 120 is connected, and pins 4 and 5 of relay chip U6 and relay chip U5 are connected to the ECG measurement module 300. Pin 6 of relay chip U6 is connected to one end of HVL electrode 231. When the channel switching module 400 is in the first state, pins 2 and 3 of relay chip U5, pins 6 and 7 of relay chip U5, pins 2 and 3 of relay chip U6, and pins 6 and 7 of relay chip U6 are connected. When the channel switching module 400 is in the second state, pins 3 and 4 of relay chip U5, pins 3 and 4 of relay chip U6, and pins 5 and 6 of relay chip U6 are connected.

[0055] Specifically, relay chips U5 and U6 are designated as G6K-2F-Y, meaning pin 1 of both U5 and U6 is the power supply pin, and pin 8 of both U5 and U6 is the ground pin. When relay chips U5 and U6 are not powered, it is in body fat measurement mode. In this mode, pins 2 and 3 of U5, pins 6 and 7 of U5, pins 2 and 3 of U6, and pins 6 and 7 of U6 are connected. HVL electrode 231, HIL electrode 232, HVR electrode 233, and HIR electrode 234 will then connect to the first main control module. The 120 connection, in conjunction with foot electrodes, completes body fat measurement. When relay chips U5 and U6 are powered, it is in ECG measurement mode. At this time, pins 3 and 4 of relay chip U5, pins 3 and 4 of relay chip U6, and pins 5 and 6 of relay chip U6 are connected. HVL electrode 231, HIL electrode 232, and HIR electrode 234 will then connect to the ECG measurement module 300 to complete the ECG measurement. Switching the measurement signal via relays isolates the ECG and bioimpedance measurement signals, mitigating the influence of reel parasitic capacitance on ECG testing. When switching measurement channels, it reduces the impact on the ECG signal and prevents the ECG measurement signal from being affected by the hand bioimpedance measurement channel.

[0056] Reference Figure 10 In some embodiments, the weighing module 140 includes a weight sensor S+, a weight sensor S-, a weight sensor E+, a weight sensor E-, and capacitors C56-C58. The third pin of weight sensor S+ is connected to the third pin of weight sensor E-. The second pin of weight sensor S+ is connected to the first main control module 120, one end of capacitor C56, and one end of capacitor C57, respectively. The first pin of weight sensor S+ is connected to the third pin of weight sensor E+. The second pin of weight sensor E+ is connected to the first main control module 120. The first pin of weight sensor E+ is connected to the first pin of weight sensor S-. The second pin of weight sensor S- is connected to the first main control module 120, the other end of capacitor C57, and one end of capacitor C58, respectively. The other ends of capacitors C56 and C58 are connected to the second pin of weight sensor E-. The third pin of weight sensor S- is connected to the first pin of weight sensor E-.

[0057] Reference Figure 2 , Figure 3 and Figure 16In some embodiments, the scale body 100 is provided with a display module 500 connected to the first power module 110 and the first main control module 120; in other embodiments, the display module 500 may also be provided on the handle 200 and connected to the second power module 210 and the second main control module 220.

[0058] Reference Figure 2 , Figure 3 , Figure 13 and Figure 15 In some embodiments, the ECG measurement module 300 and the channel switching module 400 are disposed on the handle 200; in other embodiments, the ECG measurement module 300 and the channel switching module 400 may also be disposed on the scale body 100, in which the second main control module 220 is also disposed on the scale body 100.

[0059] The advantages of this invention are as follows: The function of the hand electrode module is reused through a channel switching module, eliminating the need for separate electrodes for body fat and ECG measurements. When the channel switching module is in the first state, the hand electrode is connected to the first main control module, forming a complete body fat measurement circuit with the foot electrode. This allows for accurate acquisition of impedance parameters of the upper and lower limbs, combined with weight data from the weighing module, to achieve high-precision analysis of body composition such as body fat percentage and muscle mass. When the module switches to the second state, the hand electrode is connected to the ECG measurement module, forming an ECG measurement circuit. This facilitates the acquisition of electrocardiogram data, meeting the needs of cardiovascular health monitoring. This design significantly simplifies the hardware structure, reduces the number of electrodes, lowers equipment production costs and assembly complexity, and avoids the operational inconvenience caused by multiple electrode switching, thus improving ease of use.

[0060] Of course, this utility model is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of this utility model. All such equivalent modifications and substitutions are included within the scope defined by the claims of this application.

Claims

1. A body fat scale having an ECG measurement function, characterized by: The system includes a scale body (100) and a handle (200). The scale body (100) is provided with a first power module (110), a first main control module (120), a foot electrode module (130), and a weighing module (140) connected to the first power module (110). The handle (200) is provided with a second power module (210), a second main control module (220), and a hand electrode module (230) connected to the second power module (210). The foot electrode module (130) includes an FVL electrode (131), an FIL electrode (132), an FVR electrode (133), and an FIR electrode (134). The hand electrode module (230) includes an HVL electrode (231), an HIL electrode (232), an HVR electrode (233), and an HIR electrode (234). The system also includes an ECG measurement module (300) and a channel switching module (400). The foot electrode module (130) is used to collect impedance parameters of the human lower limbs, and the hand electrode module (230) is used to collect impedance parameters of the human upper limbs. The weighing module (140) is used to collect human body weight parameters; The input terminal of the ECG measurement module (300) is connected to the second main control module (220) and the channel switching module (400), and the output terminal is connected to the first main control module (120); The channel switching module (400) is connected to the hand electrode module (230) and has a first state and a second state; The channel switching module (400) can connect the HVL electrode (231), HIL electrode (232), HVR electrode (233) and HIR electrode (234) to the first main control module (120) in the first state to form a body fat measurement circuit, or the channel switching module (400) can connect the HVL electrode (231), HIL electrode (232) and HIR electrode (234) to the ECG measurement module (300) in the second state to form an ECG measurement circuit.

2. The body fat scale with ECG measurement function according to claim 1, characterized in that: The channel switching module (400) includes relay chip U5 and relay chip U6. Pin 1 of relay chip U5 is connected to VCC terminal, pin 8 of relay chip U5 is connected to GND terminal, pin 3 of relay chip U5 is connected to one end of HIR electrode (234), pin 2 and pin 7 of relay chip U5 are connected to the first main control module (120), pin 4 of relay chip U5 is connected to the ECG measurement module (300), pin 6 of relay chip U5 is connected to one end of HVR electrode (233), and pin 5 of relay chip U5 is left floating. Pin 1 of relay chip U6 is connected to the VCC terminal, pin 8 of relay chip U6 is connected to the GND terminal, pin 3 of relay chip U6 is connected to one end of the HIL electrode (232), pin 2 and pin 7 of relay chip U6 are connected to the first main control module (120), pin 4 of relay chip U6 and pin 5 of relay chip U5 are connected to the ECG measurement module (300), and pin 6 of relay chip U6 is connected to one end of the HVL electrode (231). When the channel switching module (400) is in the first state, pin 2 of relay chip U5 is connected to pin 3 of relay chip U5, pin 6 of relay chip U5 is connected to pin 7 of relay chip U5, pin 2 of relay chip U6 is connected to pin 3 of relay chip U6, and pin 6 of relay chip U6 is connected to pin 7 of relay chip U6. When the channel switching module (400) is in the second state, pin 3 of relay chip U5 is connected to pin 4 of relay chip U5, pin 3 of relay chip U6 is connected to pin 4 of relay chip U6, and pin 5 of relay chip U6 is connected to pin 6 of relay chip U6.

3. The body fat scale with ECG measurement function according to claim 2, characterized in that: The model numbers of relay chips U5 and U6 are set to G6K-2F-Y.

4. A body fat scale with ECG measurement function according to claim 1, characterized in that: The weighing module (140) includes a weight sensor S+, a weight sensor S-, a weight sensor E+, a weight sensor E-, and capacitors C56-C58. The third pin of the weight sensor S+ is connected to the third pin of the weight sensor E-. The second pin of the weight sensor S+ is connected to the first main control module (120), one end of capacitor C56, and one end of capacitor C57, respectively. The first pin of the weight sensor S+ is connected to the third pin of the weight sensor E+. The second pin of the weight sensor E+ is connected to the first main control module (120). The first pin of the weight sensor E+ is connected to the first pin of the weight sensor S-. The second pin of the weight sensor S- is connected to the first main control module (120), the other end of capacitor C57, and one end of capacitor C58, respectively. The other ends of capacitors C56 and C58 are connected to the second pin of the weight sensor E-. The third pin of the weight sensor S- is connected to the first pin of the weight sensor E-.

5. A body fat scale with ECG measurement function according to claim 1, characterized in that: The ECG measurement module (300) and the channel switching module (400) are mounted on the handle (200).

6. A body fat scale with ECG measurement function according to claim 1, characterized in that: The handle (200) is connected to the scale body (100) by a transmission cable (610). The scale body (100) is provided with a spool (620). The transmission cable (610) is wound on the spool (620) so that the transmission cable (610) can be unwound from the spool (620) and then wound back up.

7. A body fat scale with ECG measurement function according to claim 1, characterized in that: The scale body (100) is provided with a storage slot (700) with an opening (710), and the handle (200) is housed in the storage slot (700).

8. A body fat scale with ECG measurement function according to claim 7, characterized in that: The handle (200) is magnetically connected to the storage slot (700).

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