Charging reset circuit of lithium battery power supply electronic scale and electronic scale

Abstract

The utility model discloses a lithium battery powered electronic scale charging reset circuit and an electronic scale, the lithium battery powered electronic scale charging reset circuit comprises an enabling power supply unit and a charging reset unit, the enabling power supply unit is located between an external power supply and a power receiving device and is used for adjusting the voltage of the external power supply to supply power to the power receiving device; the charging reset unit is located between the external power supply and the enabling power supply unit, the charging reset unit is connected with the enabling control end of the enabling power supply unit, and the charging reset unit is connected with the external power supply. According to the utility model, by arranging the enabling power supply unit and the charging reset unit, charging and reset functions are integrated, and a reset button hole does not need to be arranged on the housing, so that the integrity of the housing of the electronic scale is improved, the waterproof and dustproof performances of the electronic scale are improved, and the electronic scale is more beautiful. In addition, the circuit also simplifies the internal structure of the electronic scale, simplifies the assembly steps and the number of parts in the production process, improves the production efficiency, and reduces the production cost.

Description

Technical Field

[0001] This utility model relates to the field of electronic scale technology, and more specifically, to a charging reset circuit and an electronic scale powered by a lithium battery. Background Technology

[0002] Current electronic scales generally use dry cell batteries as their power source. Due to their limited capacity and non-rechargeable nature, dry cell batteries require frequent replacements, placing a significant financial burden on consumers and causing inconvenience. From a long-term perspective, the total cost of dry cell batteries accumulates considerably due to frequent replacements. In contrast, lithium batteries, with their cycle life of hundreds to thousands of charge-discharge cycles, significantly reduce the need for battery replacements, providing users with a more economical and durable power solution. Furthermore, lithium batteries typically require no special maintenance in daily use, only periodic charging to maintain their performance. This gives lithium batteries a significant advantage in total cost of ownership compared to dry cell batteries.

[0003] However, current electronic scale designs often enclose the lithium battery inside, making it non-removable. This helps maintain the product's cleanliness and aesthetics, but when the electronic scale malfunctions and needs to be reset, the non-removable battery usually necessitates the addition of a reset button. This affects the scale's sealing to some extent, requiring additional consideration of the sealing structure during design and manufacturing, thus increasing the product's structural complexity and production costs.

[0004] The above shortcomings need to be improved. Summary of the Invention

[0005] To address or mitigate the problem that setting a reset button on existing electronic scales affects the overall sealing of the scale and increases design and manufacturing difficulty, this utility model provides a charging reset circuit and electronic scale for a lithium battery-powered electronic scale.

[0006] The technical solution of this utility model is as follows:

[0007] A charging reset circuit and a scale powered by a lithium battery are disclosed. The scale includes an enabling power supply unit and a charging reset unit. The enabling power supply unit is located between an external power source and a powered device, and is used to adjust the voltage of the external power source to supply power to the powered device. The charging reset unit is located between the external power source and the enabling power supply unit, and is connected to the enabling control terminal of the enabling power supply unit. The charging reset unit is also connected to the external power source.

[0008] Furthermore, the charging reset unit includes a capacitor C4, a resistor R7, a resistor R8, a diode D1, and a transistor Q2. The first end of the resistor R7 is connected to the negative terminal of the battery, the first end of the capacitor C3, and ground. The second end of the resistor R7 is connected to the first end of the capacitor C4, the positive terminal of the diode D1, and the first end of the resistor R8. The second end of the capacitor C4 is connected to the first power supply and the negative terminal of the diode D1. The resistor R8 is connected to the base of the transistor Q2. The collector of the transistor Q2 is connected to the enable control terminal of the enable power supply unit. The emitter of the transistor Q2 is connected to the first end of the capacitor C5 and ground.

[0009] Furthermore, the enabling power supply unit includes a voltage regulator chip U2. The first pin Vin of the voltage regulator chip U2 is connected to the positive terminal of the battery, the second terminal of the capacitor C3, the external power supply, and the first terminal of the resistor R9. The second pin Vss of the voltage regulator chip U2 is grounded. The third pin CE of the voltage regulator chip U2 is the enable control terminal. The third pin CE of the voltage regulator chip U2 is connected to the second terminal of the resistor R9. The fifth pin Vout of the voltage regulator chip U2 is connected to the second terminal of the capacitor C5 and the second power supply.

[0010] Furthermore, the enabling power supply unit is connected to the charging management unit, which includes a charging chip U1. The first pin TEMP of the charging chip U1 is connected to the first terminals of resistors R1 and R2. The second pin PROG of the charging chip U1 is connected to the first terminal of resistor R3. The third pin GND of the charging chip U1 is connected to resistors R2 and R3, the first terminal of the charging interface, capacitor C1, the ninth pin EP, and ground. The fourth pin VCC of the charging chip U1 is connected to the second terminal of the charging interface, the first power supply, the second terminal of capacitor C1, the second terminal of resistor R1, and the first terminal of resistor R4. The fifth pin BAT of the charging chip U1 is connected to the second power supply. The sixth pin DONE of the charging chip U1 is connected to the first terminal of resistor R6. The second terminal of resistor R6 is connected to the nineteenth pin P22 of the main control chip. The seventh pin CHRG of the charging chip U1 is connected to the first terminal of resistor R5. The second terminal of resistor R5 is connected to the seventeenth pin P20 of the main control chip. The eighth pin of the charging chip U1 is connected to the second terminal of resistor R4.

[0011] Furthermore, the enabling power supply unit is connected to the main control unit, which includes a main control chip U3, and the enabling power supply unit is used to supply power to the main control unit.

[0012] Furthermore, the main control unit is connected to the pressure sensor unit, and the E+, S+, and S- terminals of the pressure sensor unit are respectively connected to the fourth pin AVDDR, the fifth pin AO, and the sixth pin A1 of the main control chip, and the E- terminal of the pressure sensor unit is grounded.

[0013] Furthermore, the main control unit is connected to the display unit, which includes multiple light-emitting diodes. The 20th pin P23, 21st pin P24, 22nd pin P25, 23rd pin P26, 24th pin P27, 28th pin P33, 29th pin P34, 30th pin P35, 31st pin P36, and 31st pin P37 of the main control chip are used to control the light-emitting diodes to turn on and off.

[0014] An electronic scale, employing the charging and reset circuit of the lithium battery-powered electronic scale described above, includes a bottom shell and a front panel, with a receiving cavity provided between the bottom shell and the front panel, and pressure sensors respectively provided at the four corners of the receiving cavity.

[0015] Furthermore, the panel is provided with electrode plates, each corresponding to a pressure sensor, and the electrode plates are bonded to the panel.

[0016] Furthermore, the pressure sensor is provided with a foot support on top, which is bonded to the panel. A scale foot is provided below the pressure sensor, which is engaged with the pressure sensor and the bottom shell. A foot pad is provided at the bottom of the scale foot.

[0017] According to the above-described solution, the beneficial effects of this utility model are as follows: by setting an enable power supply unit and a charging reset unit, the charging and reset functions are integrated into one unit, eliminating the need for a reset button hole on the housing. This improves the integrity of the electronic scale housing, enhances the product's waterproof and dustproof performance, and makes the product more aesthetically pleasing. Furthermore, this circuit simplifies the internal structure of the electronic scale, reduces assembly steps and the number of parts in the production process, improves production efficiency, and reduces production costs. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the circuit topology of this utility model;

[0020] Figure 2 This is a schematic diagram of the circuit structure of the charging management unit in this utility model;

[0021] Figure 3 This is a schematic diagram of the circuit structure of the charging reset unit and the enabling power supply unit in this utility model;

[0022] Figure 4 This is a schematic diagram of the circuit structure of the main control unit in this utility model;

[0023] Figure 5 This is a schematic diagram of the circuit structure of the pressure sensor unit in this utility model;

[0024] Figure 6 This is a schematic diagram of the circuit structure of the display unit in this utility model;

[0025] Figure 7 This is an exploded view of the electronic scale in this utility model.

[0026] The reference numerals in the figures are as follows: 1. Enable power supply unit; 2. Charging reset unit; 3. Charging management unit; 4. Main control unit; 5. Pressure sensor unit; 6. Display unit; 7. Bottom shell; 8. Panel; 9. Pressure sensor; 10. Electrode plate; 11. Foot support; 12. Scale foot; 13. Foot pad; 14. Battery; 15. Circuit board. Detailed Implementation

[0027] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0028] It should be noted that when a component is referred to as "fixed," "set," or "connected" to another component, it may be located directly or indirectly on that other component. The terms "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or position based on the accompanying drawings, and are for ease of description only, and should not be construed as limiting the technical solution. The terms "first," "second," etc., are used for ease of description only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. "Many" means two or more, unless otherwise explicitly specified. "Several" means one or more, unless otherwise explicitly specified.

[0029] like Figure 1 and Figure 3 As shown in one embodiment of the present invention, a charging reset circuit for a lithium battery-powered electronic scale includes an enabling power supply unit 1 and a charging reset unit 2. The enabling power supply unit 1 is located between an external power supply and a powered device, and is used to adjust the voltage of the external power supply to supply power to the powered device. The charging reset unit 2 is located between the external power supply and the enabling power supply unit 1, and is connected to the enabling control terminal of the enabling power supply unit 1. The charging reset unit 2 is also connected to the external power supply.

[0030] When the electronic scale needs charging or resetting, the user simply connects the charging interface to an external power source. At this time, the charging reset unit 2 enables the enable control terminal of the power supply unit 1 through circuit logic control. Under the action of the charging reset unit 2, the potential of the enable control terminal will undergo a timing change from high level to low level, enabling the power supply unit 1 to reset, the circuit is powered off, and the electronic scale's circuit system is reset, returning to its initial state.

[0031] In this embodiment, by setting up an enable power supply unit 1 and a charging reset unit 2, the charging and reset functions are integrated into one unit, eliminating the need for a reset button hole on the housing. This improves the integrity of the electronic scale housing, enhances the product's waterproof and dustproof performance, and makes the product more aesthetically pleasing. Furthermore, this circuit simplifies the internal structure of the electronic scale, reduces assembly steps and the number of parts in the production process, improves production efficiency, and lowers production costs.

[0032] like Figure 3 As shown, the charging reset unit 2 includes a capacitor C4, a resistor R7, a resistor R8, a diode D1, and a transistor Q2. The first end of the resistor R7 is connected to the negative terminal of the battery, the first end of the capacitor C3, and ground. The second end of the resistor R7 is connected to the first end of the capacitor C4, the positive terminal of the diode D1, and the first end of the resistor R8. The second end of the capacitor C4 is connected to the first power supply and the negative terminal of the diode D1. The resistor R8 is connected to the base of the transistor Q2. The collector of the transistor Q2 is connected to the enable control terminal of the enable power supply unit 1. The emitter of the transistor Q2 is connected to the first end of the capacitor C5 and ground.

[0033] During operation, capacitor C4, due to its DC blocking and AC passing characteristics, enables the power supply unit 1's enable control pin CE to be in a high-level enabled state by default through the pull-up resistor. Simultaneously, capacitor C4 begins charging, and the high-level voltage on the enable control pin CE of the power supply unit 1 begins to decrease until it reaches a low level, completing the timing change from high to low and completing one reset process. The charging time of capacitor C4 provides time for the main control chip and its subsequent circuits to reset. After power failure, capacitor C4 in the charging reset unit 2 still stores electrical energy and can only discharge slowly. If power is restored at this time, the enable pin will not reset normally and will remain at a high level. Therefore, diode D4 in the charging reset unit 2 is used as a discharge circuit to quickly release the charge from capacitor C4, preparing for the next reset.

[0034] like Figure 3As shown, the power supply unit 1 includes a voltage regulator chip U2. The first pin Vin of the voltage regulator chip U2 is connected to the positive terminal of the battery, the second terminal of the capacitor C3, the external power supply, and the first terminal of the resistor R9. The second pin Vss of the voltage regulator chip U2 is grounded. The third pin CE of the voltage regulator chip U2 is the enable control terminal and is connected to the second terminal of the resistor R9. The fifth pin Vout of the voltage regulator chip U2 is connected to the second terminal of the capacitor C5 and the second power supply.

[0035] Specifically, the second power supply is 5V, used to power the main control chip. The external power supply here is the output power after the external power supply connected to the charging interface is converted by the charging management unit 3.

[0036] like Figure 2 As shown, the power supply unit 1 is connected to the charging management unit 3. The charging management unit 3 includes a charging chip U1. The first pin TEMP of the charging chip U1 is connected to the first terminals of resistors R1 and R2. The second pin PROG of the charging chip U1 is connected to the first terminal of resistor R3. The third pin GND of the charging chip U1 is connected to resistors R2 and R3, the first terminal of the charging interface, capacitor C1, the ninth pin EP, and ground. The fourth pin VCC of the charging chip U1 is connected to the second terminal of the charging interface, the first power supply, the second terminal of capacitor C1, the second terminal of resistor R1, and the first terminal of resistor R4. The fifth pin BAT of the charging chip U1 is connected to the second power supply. The sixth pin DONE of the charging chip U1 is connected to the first terminal of resistor R6. The second terminal of resistor R6 is connected to the nineteenth pin P22 of the main control chip. The seventh pin CHRG of the charging chip U1 is connected to the first terminal of resistor R5. The second terminal of resistor R5 is connected to the seventeenth pin P20 of the main control chip. The eighth pin of the charging chip U1 is connected to the second terminal of resistor R4.

[0037] The power supply unit 1 is used to convert the battery voltage to a voltage suitable for the operation of the pressure sensor unit 5, the main control unit 4, and the display unit 6, thus powering the pressure sensor unit 5, the display unit 6, and the main control unit 4. The powered devices include the pressure sensor 9, the main control chip U3, and the light-emitting diodes.

[0038] The charging interfaces include, but are not limited to, USB Type-A, USB Type-B, Micro USB, Mini USB, USB Type-C, Lightning, DC round port, MagSafe, AC power socket, and wireless charging.

[0039] like Figure 3 and Figure 4 As shown, the power supply enable unit 1 is connected to the main control unit 4, which includes a main control chip U3. The power supply enable unit 1 is used to supply power to the main control unit 4.

[0040] like Figure 4 and Figure 5 As shown, the main control unit 4 is connected to the pressure sensor unit 5. The E+, S+, and S- terminals of the pressure sensor unit 5 are connected to the fourth pin AVDDR, the fifth pin AO, and the sixth pin A1 of the main control chip, respectively. The E- terminal of the pressure sensor unit 5 is grounded. The pressure sensor unit 5 includes multiple pressure sensors.

[0041] like Figure 4 and Figure 6 As shown, the main control unit 4 is connected to the display unit 6. The display unit 6 includes multiple light-emitting diodes. The 20th pin P23, 21st pin P24, 22nd pin P25, 23rd pin P26, 24th pin P27, 28th pin P33, 29th pin P34, 30th pin P35, 31st pin P36 and 32nd pin P37 of the main control chip are used to control the on / off state of the light-emitting diodes.

[0042] The pressure sensor unit 5 is used to detect the weight of the items or people to be weighed, and the main control unit 4 is used to process the weight data of the items or people detected by the pressure sensor 9 and transmit it to the display unit 6 for display.

[0043] like Figure 7 As shown, an electronic scale in one embodiment of the present invention uses the charging and reset circuit of the lithium battery-powered electronic scale described above. It includes a bottom shell 7 and a panel 8. A receiving cavity is provided between the bottom shell 7 and the panel 8, and pressure sensors 9 are respectively provided at the four corners of the receiving cavity.

[0044] Electrode plates 10 are provided on panel 8. The positions of electrode plates 10 and pressure sensors 9 are one-to-one. Electrode plates 10 are bonded to panel 8.

[0045] The pressure sensor 9 is provided with a foot support 11 on the top, which is bonded to the panel 8. The pressure sensor 9 is provided with a weighing foot 12 below, which is engaged with the pressure sensor 9 and the bottom shell 7. The weighing foot 12 is provided with a foot pad 13 at the bottom.

[0046] In this embodiment, by employing the charging and reset circuit of the lithium battery-powered electronic scale described above, there is no need to provide a reset button opening on the bottom shell 7 or the panel 8, resulting in better overall integrity and edge sealing. This provides better protection for components such as the battery 14, circuit board 15, and pressure sensor 9 within the accommodating cavity. The battery 14 is a lithium battery, and the circuit board 15 serves as the main carrier of the charging and reset circuit. Furthermore, by aligning the pressure sensor 9 with the electrode plates 10, it is easy to control the position of the item being weighed or the person's standing position, ensuring the accuracy of the weighing data. Simultaneously, the engaging connection between the scale feet 12 and the pressure sensor 9, as well as the engaging connection between the scale feet 12 and the bottom shell 7, not only simplifies the assembly process but also provides better structural stability. In addition, the foot pads 13 further enhance the anti-slip performance of the electronic scale, improving the user experience.

[0047] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A charging reset circuit for a lithium battery-powered electronic scale, characterized in that, include: An enabling power supply unit is located between an external power source and a powered device, and is used to regulate the voltage of the external power source to supply power to the powered device; A charging reset unit is located between the external power supply and the enabling power supply unit. The charging reset unit is connected to the enabling control terminal of the enabling power supply unit and is connected to the external power supply.

2. The charging reset circuit for a lithium battery-powered electronic scale according to claim 1, characterized in that, The charging reset unit includes a capacitor C4, a resistor R7, a resistor R8, a diode D1, and a transistor Q2. The first end of the resistor R7 is connected to the negative terminal of the battery, the first end of the capacitor C3, and ground. The second end of the resistor R7 is connected to the first end of the capacitor C4, the positive terminal of the diode D1, and the first end of the resistor R8. The second end of the capacitor C4 is connected to the first power supply and the negative terminal of the diode D1. The resistor R8 is connected to the base of the transistor Q2. The collector of the transistor Q2 is connected to the enable control terminal of the enable power supply unit. The emitter of the transistor Q2 is connected to the first end of the capacitor C5 and ground.

3. The charging reset circuit for a lithium battery-powered electronic scale according to claim 1, characterized in that, The enabling power supply unit includes a voltage regulator chip U2. The first pin Vin of the voltage regulator chip U2 is connected to the positive terminal of the battery, the second terminal of the capacitor C3, the external power supply, and the first terminal of the resistor R9. The second pin Vss of the voltage regulator chip U2 is grounded. The third pin CE of the voltage regulator chip U2 is the enable control terminal. The third pin CE of the voltage regulator chip U2 is connected to the second terminal of the resistor R9. The fifth pin Vout of the voltage regulator chip U2 is connected to the second terminal of the capacitor C5 and the second power supply.

4. The charging reset circuit for a lithium battery-powered electronic scale according to claim 1, characterized in that, The enabling power supply unit is connected to the charging management unit, which includes a charging chip U1. The first pin TEMP of the charging chip U1 is connected to the first terminals of resistors R1 and R2. The second pin PROG of the charging chip U1 is connected to the first terminal of resistor R3. The third pin GND of the charging chip U1 is connected to resistors R2 and R3, the first terminal of the charging interface, capacitor C1, the ninth pin EP, and ground. The fourth pin VCC of the charging chip U1 is connected to the second terminal of the charging interface, the first power supply, the second terminal of capacitor C1, the second terminal of resistor R1, and the first terminal of resistor R4. The fifth pin BAT of the charging chip U1 is connected to the second power supply. The sixth pin DONE of the charging chip U1 is connected to the first terminal of resistor R6. The second terminal of resistor R6 is connected to the nineteenth pin P22 of the main control chip. The seventh pin CHRG of the charging chip U1 is connected to the first terminal of resistor R5. The second terminal of resistor R5 is connected to the seventeenth pin P20 of the main control chip. The eighth pin of the charging chip U1 is connected to the second terminal of resistor R4.

5. The charging reset circuit for a lithium battery-powered electronic scale according to claim 1, characterized in that, The enabling power supply unit is connected to the main control unit, which includes a main control chip U3. The enabling power supply unit is used to supply power to the main control unit.

6. The charging reset circuit for a lithium battery-powered electronic scale according to claim 5, characterized in that, The main control unit is connected to the pressure sensor unit. The E+, S+, and S- terminals of the pressure sensor unit are respectively connected to the fourth pin AVDDR, the fifth pin AO, and the sixth pin A1 of the main control chip. The E- terminal of the pressure sensor unit is grounded.

7. The charging reset circuit for a lithium battery-powered electronic scale according to claim 5, characterized in that, The main control unit is connected to the display unit, which includes multiple light-emitting diodes. The 20th pin P23, 21st pin P24, 22nd pin P25, 23rd pin P26, 24th pin P27, 28th pin P33, 29th pin P34, 30th pin P35, 31st pin P36, and 32nd pin P37 of the main control chip are used to control the on / off state of the light-emitting diodes.

8. An electronic scale, characterized in that, The charging reset circuit of the lithium battery-powered electronic scale according to any one of claims 1-7 includes a bottom shell and a front panel, wherein a receiving cavity is provided between the bottom shell and the front panel, and pressure sensors are respectively provided at the four corners of the receiving cavity.

9. An electronic scale according to claim 8, characterized in that, The panel is provided with electrode plates, each of which corresponds to a pressure sensor and is bonded to the panel.

10. An electronic scale according to claim 8, characterized in that, The pressure sensor is provided with a foot support on top, which is bonded to the panel. A scale foot is provided below the pressure sensor, which is engaged with the pressure sensor and the bottom shell. A foot pad is provided at the bottom of the scale foot.

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