Control circuit of electronic scale and electronic scale

Abstract

The utility model provides an electronic scale control circuit and an electronic scale, the electronic scale control circuit comprises a power supply circuit, a button control circuit, a switch control circuit and a control chip, the power supply end of the power supply circuit is connected with the first end of the switch control circuit, one end of the button control circuit is connected with the second end of the switch control circuit, and the other end of the button control circuit is connected with the control chip. The other end of the key control circuit is connected with the first control end of the control chip, the third end of the switch control circuit is connected with the second control end of the control chip, and the fourth end of the switch control circuit is connected with the power supply end of the control chip. According to the electronic scale, the standby power-off function can be realized by using the design of the circuit in cooperation with the chip, the service life of the battery is effectively prolonged, the necessary functions of a plurality of electronic scales are realized through cooperation of the plurality of circuits in cooperation with the chip under the condition that keys are not increased, and the effects of reducing the manufacturing cost of the sub-scale and improving the reliability of the electronic scale circuit are achieved.

Description

Technical Field

[0001] This application relates to the field of electronic scale equipment technology, and in particular to a control circuit and an electronic scale. Background Technology

[0002] With the development of the electronic scale industry, more and more people are becoming familiar with and using electronic scales.

[0003] Due to their high frequency of use and long operating time, the availability of power supply, ease of use, and reliability of circuitry are particularly important for electronic scales. However, currently, electronic scales are generally powered by a direct connection between the power supply and the back-end circuitry, which results in current flowing during standby, potentially reducing battery life. Furthermore, the addition of too many buttons due to increased functionality leads to overly complex circuitry, increasing manufacturing costs and reducing the reliability of the electronic scale's circuitry. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a control circuit and electronic scale for an electronic scale. By using the circuit design in conjunction with the chip, a standby power-off function can be realized, which can effectively improve the battery life. Furthermore, by cooperating with multiple circuits and the chip, the necessary functions of multiple electronic scales can be realized without adding buttons, thereby reducing the manufacturing cost of sub-scales and improving the reliability of the electronic scale circuit.

[0005] In a first aspect, embodiments of this application provide a control circuit for an electronic scale, comprising: a power supply circuit, a button control circuit, a switch control circuit, and a control chip. The power supply terminal of the power supply circuit is connected to a first terminal of the switch control circuit, one terminal of the button control circuit is connected to a second terminal of the switch control circuit, the other terminal of the button control circuit is connected to a first control terminal of the control chip, a third terminal of the switch control circuit is connected to a second control terminal of the control chip, and a fourth terminal of the switch control circuit is connected to the power supply terminal of the control chip.

[0006] Optionally, the power supply circuit includes a power source and a protection sub-circuit, wherein the positive terminal of the power source is connected to the first terminal of the protection sub-circuit, the negative terminal of the power source is grounded, the second terminal of the protection sub-circuit serves as the power supply terminal of the power supply circuit and is connected to the first terminal of the switch control circuit, and the third terminal of the protection sub-circuit is grounded.

[0007] Optionally, the protection sub-circuit includes a first capacitor and a second capacitor, wherein one end of the first capacitor is connected to the positive terminal of the power supply as the first terminal of the protection sub-circuit, one end of the first capacitor is also connected to one end of the second capacitor, one end of the second capacitor is connected to the first terminal of the switch control circuit as the second terminal of the protection sub-circuit, the other end of the first capacitor is grounded as the third terminal of the protection sub-circuit, and the other end of the second capacitor is connected to the other end of the first capacitor.

[0008] Optionally, the button control circuit includes a first diode, a second diode, a third capacitor, and a button. The anode of the first diode serves as one end of the button control circuit and is connected to the second terminal of the switch control circuit. The cathode of the first diode is connected to the cathode of the second diode. The anode of the second diode serves as the other end of the button control circuit and is connected to the first control terminal of the control chip. The first contact point of the button is connected to the cathode of the second diode. The second contact point of the button is connected to one end of the third capacitor. The other end of the third capacitor is connected to the anode of the second diode. The second contact point of the button is also grounded.

[0009] Optionally, the switch control circuit includes: a first switch control sub-circuit and a second switch control sub-circuit, wherein a first terminal of the first switch control sub-circuit is connected to the power supply terminal of the power supply circuit as the first terminal of the switch control circuit, a second terminal of the first switch control sub-circuit is connected to the power supply terminal of the control chip as the fourth terminal of the switch control circuit, a third terminal of the first switch control sub-circuit is connected to one terminal of the second switch sub-circuit, one terminal of the second switch control sub-circuit is connected to one terminal of the button control circuit as the second terminal of the switch control circuit, and the other terminal of the second switch control sub-circuit is connected to the second control terminal of the control chip as the third terminal of the switch control circuit.

[0010] Optionally, the first switch control sub-circuit includes a field-effect transistor (FET), a first resistor, and a second resistor. The source of the FET serves as the first terminal of the first switch control sub-circuit and is connected to the power supply terminal of the power supply circuit. The drain of the FET serves as the second terminal of the first switch control sub-circuit and is connected to the power supply terminal of the control chip. The gate of the FET is connected to one end of the second resistor. The other end of the second resistor serves as the third terminal of the first switch control sub-circuit and is connected to one end of the second switch sub-circuit. One end of the first resistor is connected to the source of the FET, and the other end of the first resistor is connected to one end of the second resistor.

[0011] Optionally, the second switch control sub-circuit includes a transistor, a third resistor, and a fourth resistor. The emitter of the transistor is grounded, and the collector of the transistor is connected as one end of the second switch control sub-circuit to one end of the button control circuit and the third end of the first switch control sub-circuit. One end of the third resistor is connected to the base of the transistor, and the other end of the third resistor is connected as the other end of the second switch control sub-circuit to the second control terminal of the control chip. One end of the fourth resistor is connected to one end of the third resistor, and the other end of the fourth resistor is grounded.

[0012] Optionally, the field-effect transistor is a P-type field-effect transistor.

[0013] Optionally, the transistor is an NPN transistor.

[0014] Secondly, embodiments of this application provide an electronic scale, including the control circuit of the electronic scale as described in any of the first aspects.

[0015] This application provides a control circuit and electronic scale for an electronic scale. By using circuit design in conjunction with a chip, a standby power-off function can be achieved, effectively improving battery life. Furthermore, by cooperating with multiple circuits and chips, the necessary functions of multiple electronic scales can be realized without adding buttons, thereby reducing the manufacturing cost of sub-scales and improving the reliability of the electronic scale circuit. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the control circuit of an electronic scale provided in an embodiment of this utility model;

[0018] Figure 2 A schematic diagram of the control circuit of another electronic scale provided in an embodiment of this utility model. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component 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.

[0023] Furthermore, the terms "first," "second," and "third" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0024] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] Considering that with the development of the electronic scale industry, more and more electronic scales are becoming familiar to and used by people in the current technology.

[0026] Due to their high frequency of use and long operating time, the availability of power supply, ease of use, and reliability of circuitry are particularly important for electronic scales. However, currently, electronic scales are generally powered by a direct connection between the power supply and the back-end circuitry, which results in current flowing during standby, potentially reducing battery life. Furthermore, the addition of too many buttons due to increased functionality leads to overly complex circuitry, increasing manufacturing costs and reducing the reliability of the electronic scale's circuitry.

[0027] Please see Figure 1 , Figure 1 This is a schematic diagram of the control circuit of an electronic scale provided in this embodiment.

[0028] like Figure 1 As shown in the figure, the control circuit of the electronic scale provided in this embodiment includes: a power supply circuit 100, a button control circuit 200, a switch control circuit 300, and a control chip 400.

[0029] Specifically, the power supply terminal of the power supply circuit 100 is connected to the first terminal of the switch control circuit 300, one terminal of the button control circuit 200 is connected to the second terminal of the switch control circuit 300, the other terminal of the button control circuit 200 is connected to the first control terminal of the control chip 400, the third terminal of the switch control circuit 300 is connected to the second control terminal of the control chip 400, and the fourth terminal of the switch control circuit 300 is connected to the power supply terminal of the control chip 400.

[0030] Optionally, the power supply circuit 100 includes a power supply and a protection sub-circuit, wherein the positive terminal of the power supply is connected to the first terminal of the protection sub-circuit, the negative terminal of the power supply is grounded, the second terminal of the protection sub-circuit serves as the power supply terminal of the power supply circuit 100 and is connected to the first terminal of the switch control circuit 300, and the third terminal of the protection sub-circuit is grounded.

[0031] Optionally, the protection sub-circuit includes a first capacitor and a second capacitor, wherein one end of the first capacitor is connected to the positive terminal of the power supply as the first terminal of the protection sub-circuit, and one end of the first capacitor is also connected to one end of the second capacitor, one end of the second capacitor is connected to the first terminal of the switch control circuit 300 as the second terminal of the protection sub-circuit, the other end of the first capacitor is grounded as the third terminal of the protection sub-circuit, and the other end of the second capacitor is connected to the other end of the first capacitor.

[0032] Optionally, the button control circuit 200 includes a first diode, a second diode, a third capacitor, and a button. The anode of the first diode serves as one end of the button control circuit 200 and is connected to the second terminal of the switch control circuit 300. The cathode of the first diode is connected to the cathode of the second diode. The anode of the second diode serves as the other end of the button control circuit 200 and is connected to the first control terminal of the control chip 400. The first contact point of the button is connected to the cathode of the second diode. The second contact point of the button is connected to one end of the third capacitor. The other end of the third capacitor is connected to the anode of the second diode. The second contact point of the button is also grounded.

[0033] Optionally, the switch control circuit 300 includes: a first switch control sub-circuit and a second switch control sub-circuit, wherein a first end of the first switch control sub-circuit is connected to the power supply terminal of the power supply circuit 100 as the first terminal of the switch control circuit 300, a second end of the first switch control sub-circuit is connected to the power supply terminal of the control chip 400 as the fourth terminal of the switch control circuit 300, a third end of the first switch control sub-circuit is connected to one end of the second switch sub-circuit, one end of the second switch control sub-circuit is connected to one end of the button control circuit 200 as the second terminal of the switch control circuit 300, and the other end of the second switch control sub-circuit is connected to the second control terminal of the control chip 400 as the third terminal of the switch control circuit 300.

[0034] Optionally, the first switch control sub-circuit includes a field-effect transistor (FET), a first resistor, and a second resistor. The source of the FET serves as the first terminal of the first switch control sub-circuit and is connected to the power supply terminal of the power supply circuit. The drain of the FET serves as the second terminal of the first switch control sub-circuit and is connected to the power supply terminal of the control chip. The gate of the FET is connected to one end of the second resistor. The other end of the second resistor serves as the third terminal of the first switch control sub-circuit and is connected to one end of the second switch sub-circuit. One end of the first resistor is connected to the source of the FET, and the other end of the first resistor is connected to one end of the second resistor.

[0035] Optionally, the second switch control sub-circuit includes a transistor, a third resistor, and a fourth resistor. The emitter of the transistor is grounded, and the collector of the transistor is connected as one end of the second switch control sub-circuit to one end of the button control circuit 200 and the third end of the first switch control sub-circuit. One end of the third resistor is connected to the base of the transistor, and the other end of the third resistor is connected as the other end of the second switch control sub-circuit to the second control terminal of the control chip. One end of the fourth resistor is connected to one end of the third resistor, and the other end of the fourth resistor is grounded.

[0036] Optionally, the field-effect transistor is a P-type field-effect transistor.

[0037] Optionally, the transistor is an NPN transistor.

[0038] For details, please refer to Figure 2 , Figure 2 This is a schematic diagram of the control circuit of another electronic scale provided in this embodiment.

[0039] exist Figure 1 On the basis of, such as Figure 2 As shown in the diagram, the control circuit of the electronic scale provided in this embodiment includes: a power supply circuit 100, a button K1 control circuit 200, a switch control circuit 300, and a control chip 400. The power supply circuit 100 includes a power supply VCC and a protection sub-circuit, which includes a first capacitor C1 and a second capacitor C2. The button K1 control circuit 200 includes a first diode D1, a second diode D2, a third capacitor C3, and a button K1. The switch control circuit 300 includes a first switch control sub-circuit and a second switch control sub-circuit. The first switch control sub-circuit includes a field-effect transistor Q1, a first resistor R1, and a second resistor R2. The second switch control sub-circuit includes a transistor Q2, a third resistor R3, and a fourth resistor R4.

[0040] The positive terminal of the power supply VCC is connected to the first terminal of the protection sub-circuit, the negative terminal of the power supply VCC is grounded, the second terminal of the protection sub-circuit serves as the power supply terminal of the power supply circuit 100 and is connected to the first terminal of the switch control circuit 300, and the third terminal of the protection sub-circuit is grounded.

[0041] Wherein, one end of the first capacitor C1 is connected to the positive terminal of the power supply VCC as the first terminal of the protection sub-circuit, one end of the first capacitor C1 is also connected to one end of the second capacitor C2, one end of the second capacitor C2 is connected to the first terminal of the switch control circuit 300 as the second terminal of the protection sub-circuit, the other end of the first capacitor C1 is grounded as the third terminal of the protection sub-circuit, and the other end of the second capacitor C2 is connected to the other end of the first capacitor C1.

[0042] In this circuit, the positive terminal of the first diode D1 serves as one end of the button K1 control circuit 200 and is connected to the second terminal of the switch control circuit 300. The negative terminal of the first diode D1 is connected to the negative terminal of the second diode D2. The positive terminal of the second diode D2 serves as the other end of the button K1 control circuit 200 and is connected to the first control terminal of the control chip 400. The first contact point of the button K1 is connected to the negative terminal of the second diode D2. The second contact point of the button K1 is connected to one end of the third capacitor C3. The other end of the third capacitor C3 is connected to the positive terminal of the second diode D2. The second contact point of the button K1 is also grounded.

[0043] In this circuit, the source of the field-effect transistor (FET) is connected to the power supply terminal of the power supply circuit as the first terminal of the first switch control sub-circuit; the drain of the FET is connected to the power supply terminal of the control chip as the second terminal of the first switch control sub-circuit; the gate of the FET is connected to one end of the second resistor; the other end of the second resistor is connected to one end of the second switch sub-circuit as the third terminal of the first switch control sub-circuit; one end of the first resistor is connected to the source of the FET; and the other end of the first resistor is connected to one end of the second resistor.

[0044] Wherein, the source of the field-effect transistor Q1 is connected to the power supply terminal of the power supply circuit 100 as the first terminal of the first switch control sub-circuit, the drain of the field-effect transistor Q1 is connected to the power supply terminal of the control chip 400 as the second terminal of the first switch control sub-circuit, and the gate of the field-effect transistor Q1 is connected to one end of the second switch sub-circuit as the third terminal of the first switch control sub-circuit.

[0045] In this circuit, the emitter of transistor Q2 is grounded, the collector of transistor Q2 is connected as one end of the second switch control sub-circuit to one end of the button K1 control circuit 200 and the third end of the first switch control sub-circuit, one end of the third resistor R3 is connected to the base of transistor Q2, the other end of the third resistor R3 is connected as the other end of the second switch control sub-circuit to the second control terminal of the control chip 400, one end of the fourth resistor R4 is connected to one end of the third resistor R3, and the other end of the fourth resistor R4 is grounded.

[0046] For example, the field-effect transistor Q1 is a P-type field-effect transistor Q1.

[0047] For example, transistor Q2 is an NPN transistor.

[0048] As an example, based on Figure 2In the circuit shown, when the electronic scale is off in standby mode, the gate voltage of the field-effect transistor Q1 in the switch control circuit 300 is equal to the source voltage, and the field-effect transistor Q1 is cut off. At this time, the power supply circuit 100 and the control chip 400 are in an open circuit state, and no standby current is generated.

[0049] As an example, based on Figure 2 The circuit shown operates as follows: When the electronic scale is powered on, pressing button K1 in the off state pulls the gate of MOSFET Q1 in the switch control circuit 300 low to ground (GND) through the second resistor R2, the first diode D1, and button K1. This causes the gate voltage of MOSFET Q1 to be lower than its source voltage, turning on MOSFET Q1. Power supply circuit 100 then supplies power to control chip 400, enabling the electronic scale to operate. Simultaneously, the second control terminal of control chip 400 outputs a high level through programming, driving transistor Q2 in switch control circuit 300 to conduct. After releasing button K1, the gate of MOSFET Q1 is connected to power supply VCC and ground (GND) through the second resistor R2 and transistor Q2. The gate voltage of MOSFET Q1 is lower than its source voltage, turning on MOSFET Q1. Power supply circuit 100 then continuously supplies power to control chip 400, allowing the electronic scale to operate normally.

[0050] As an example, based on Figure 2 The circuit shown, when powered off, has its first control terminal of the control chip 400 programmed to enter standby mode when the level is low. When the electronic scale is in operation, pressing button K1 pulls the second control terminal of the control chip 400 low through the second diode D2 and button K1 to ground (GND), putting the electronic scale into standby mode. Releasing button K1 outputs a low level from the first control terminal of the control chip 400, cutting off transistor Q2 in the switch control circuit 300. The gate voltage of the field-effect transistor Q1 equals its source voltage, cutting off Q1. At this time, the power supply circuit 100 and the control chip 400 are open-circuited, and no standby current is generated.

[0051] As an example, in the powered-on state, the first control terminal of the control chip 400 can be programmed to set tare conditions. When the weighing value is not 0, the tare operation is performed when the level of the first control terminal of the control chip 400 is low. When the electronic scale is in operation, when button K1 is pressed, the first control terminal of the control chip 400 is pulled low through the second diode D2 and button K1 to ground (GND). The control chip 400 can then perform the tare operation when it detects weight.

[0052] For example, the first control terminal of the control chip 400 can be pin 13, the second control terminal of the control chip 400 can be pin 9, and the model of the control chip 400 can be [missing information].

[0053] Thus, based on Figure 2 The circuit shown, based on the cooperation of a button K1, control circuit and program, can achieve the basic functions of electronic scales such as power on, power off and tare.

[0054] This application provides a control circuit and electronic scale for an electronic scale. By using the circuit design in conjunction with the chip, a standby power-off function can be achieved, effectively improving battery life. Furthermore, by cooperating with multiple circuits and the chip, the necessary functions of multiple electronic scales can be realized without adding buttons, thereby reducing the manufacturing cost of sub-scales and improving the reliability of the electronic scale circuit.

[0055] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A control circuit for an electronic scale, characterized in that The utility model relates to a kind of key control circuit, including: power supply circuit, key control circuit, switch control circuit and control chip, The power supply end of the power supply circuit is connected with the first end of the switch control circuit, one end of the key control circuit is connected with the second end of the switch control circuit, the other end of the key control circuit is connected with the first control end of control chip, the third end of the switch control circuit is connected with the second control end of control chip, the fourth end of the switch control circuit is connected with the power supply end of the control chip. The power supply circuit includes power supply and protection subcircuit, 2. The control circuit of claim 1, wherein, Wherein, the positive pole of the power supply is connected with the first end of the protection subcircuit, the negative pole of the power supply is grounded, the second end of the protection subcircuit is connected with the first end of the switch control circuit as the power supply end of the power supply circuit, the third end of the protection subcircuit is grounded. The protection subcircuit includes first capacitor and second capacitor, 3. The control circuit of claim 2, wherein, Wherein, one end of the first capacitor is connected with the positive pole of the power supply as the first end of the protection subcircuit, one end of the first capacitor is also connected with one end of the second capacitor, one end of the second capacitor is connected with the first end of the switch control circuit as the second end of the protection subcircuit, the other end of the first capacitor is grounded as the third end of the protection subcircuit, the other end of the second capacitor is connected with the other end of the first capacitor. The key control circuit includes first diode, second diode, third capacitor and key, 4. The control circuit of claim 1, wherein, Wherein, the positive pole of the first diode is connected with the second end of the switch control circuit as one end of the key control circuit, the negative pole of the first diode is connected with the negative pole of the second diode, the positive pole of the second diode is connected with the first control end of control chip as the other end of the key control circuit, the first contact point of the key is connected with the negative pole of the second diode, one end of the third capacitor is connected with the second contact point of the key, the other end of the third capacitor is connected with the positive pole of the second diode, the second contact point of the key is also grounded. The switch control circuit includes: first switch control subcircuit and second switch control subcircuit, 5. The control circuit of claim 1, wherein, Wherein, the first end of the first switch control subcircuit is connected with the power supply end of the power supply circuit as the first end of the switch control circuit, the second end of the first switch control subcircuit is connected with the power supply end of the control chip as the fourth end of the switch control circuit, the third end of the first switch control subcircuit is connected with one end of the second switch control subcircuit, one end of the second switch control subcircuit is connected with one end of the key control circuit as the second end of the switch control circuit, the other end of the second switch control subcircuit is connected with the second control end of control chip as the third end of the switch control circuit. The first switch control subcircuit includes field effect transistor, first resistor, second resistor, 6. The control circuit of claim 5, wherein, ​ The source of the field effect transistor is connected with the power supply end of the power supply circuit as the first end of the first switch control sub-circuit, the drain of the field effect transistor is connected with the power supply end of the control chip as the second end of the first switch control sub-circuit, the gate of the field effect transistor is connected with one end of the second resistor, the other end of the second resistor is connected with one end of the second switch control sub-circuit as the third end of the first switch control sub-circuit, one end of the first resistor is connected with the source of the field effect transistor, and the other end of the first resistor is connected with one end of the second resistor.

7. The control circuit of claim 5, wherein, The second switch control sub-circuit comprises a transistor, a third resistor, and a fourth resistor, The emitter of the transistor is grounded, the collector of the transistor is connected with one end of the second switch control sub-circuit and one end of the key control circuit as the third end of the first switch control sub-circuit, one end of the third resistor is connected with the base of the transistor, the other end of the third resistor is connected with the second control end of the control chip as the other end of the second switch control sub-circuit, one end of the fourth resistor is connected with one end of the third resistor, and the other end of the fourth resistor is grounded.

8. The control circuit of claim 6, wherein, The field effect transistor is a P-type field effect transistor.

9. The control circuit of claim 7, wherein, The transistor is an NPN-type transistor.

10. An electronic scale characterized in that, A control circuit comprising the electronic scale according to any one of claims 1-9. A control circuit comprising the electronic scale according to any one of claims 1-9.

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