Circuit for sampling electric quantity of battery with low power consumption and electronic equipment

Abstract

The utility model provides a circuit for sampling the electric quantity of a battery with low power consumption and electronic equipment. The circuit for sampling the electric quantity of the battery with low power consumption comprises a switching circuit, a voltage division circuit, a sampling circuit and an output circuit, the voltage division circuit comprises a first resistor and a second resistor, the switching circuit is connected between the first resistor and the second resistor, one end of the switching circuit is connected with a power supply module, and the other end of the switching circuit is connected with a ground end; the switching circuit is further connected to the output circuit so as to control on and off of the switching circuit, and the sampling circuit is connected between the switching circuit and the second resistor so as to be used for sampling. The work of the sampling circuit is controlled through the switching circuit, so that on-demand sampling of the electric quantity of the battery is realized, and the continuous energy consumption of the system is effectively reduced. Meanwhile, the circuit structure is simplified, the interference of external factors on the sampling precision is reduced, the accuracy of electric quantity detection is improved, and the equipment size and the cost are reduced.

Description

Technical Field

[0001] The present application relates to the field of battery power sampling, and in particular to a circuit and electronic device for low-power battery power sampling. Background Art

[0002] In portable electronic devices, real-time monitoring of battery charge is crucial for device energy management and user experience. Traditional battery charge detection methods usually rely on resistor dividers or current detection circuits.

[0003] At present, common battery power collection methods mainly include the following: First, direct voltage-dividing resistor sampling. However, direct voltage-dividing resistors will continue to consume power, resulting in an increase in the overall power consumption of the system; secondly, increasing the resistance value in order to improve sampling accuracy will increase the circuit board area, which is not conducive to space saving of components. The second is to add PMOS switch control, which only turns on the circuit when sampling is required, thereby reducing static power consumption. However, it is necessary to arrange additional PMOS transistors and their driving circuits on the circuit board, which will also increase space occupancy and make it difficult to meet the design requirements of modern portable electronic devices.

[0004] Therefore, it is necessary to provide a battery power sampling circuit and electronic device that can effectively reduce power consumption and minimize space occupation. Utility Model Content

[0005] In view of this, it is necessary to provide a low-power circuit for sampling battery power to solve the above problems.

[0006] The embodiment of the present application provides a circuit for sampling battery power with low power consumption, including a switch circuit, a voltage divider circuit, a sampling circuit and an output circuit;

[0007] The voltage divider circuit includes a first resistor and a second resistor, the switch circuit is connected between the first resistor and the second resistor, and one end of the switch circuit is connected to the power module, and the other end is connected to the ground;

[0008] The switch circuit is also connected to the output circuit to control the on and off of the switch circuit. The sampling circuit is connected between the switch circuit and the second resistor for sampling.

[0009] In at least one embodiment of the present application, the switching circuit is an NMOS tube, the gate of the NMOS tube is connected to the output circuit, the drain of the NMOS tube is connected to the power module and the first resistor, and the source of the NMOS tube is connected to the second resistor and the ground.

[0010] In at least one embodiment of the present application, the output circuit includes an output terminal, and the output terminal is connected to the gate of the NMOS tube.

[0011] In at least one embodiment of the present application, the output circuit further includes a first current limiting resistor, and the first current limiting resistor is connected between the output terminal and the gate of the NMOS tube.

[0012] In at least one embodiment of the present application, the sampling circuit includes a sampling terminal, and the sampling terminal is connected to the source of the NMOS tube.

[0013] In at least one embodiment of the present application, the sampling circuit further includes a second current limiting resistor and a filter capacitor, the second current limiting resistor is connected between the sampling terminal and the source of the NMOS tube, and the filter capacitor and the ground terminal are connected to the sampling terminal.

[0014] In at least one embodiment of the present application, the first resistor and the second resistor are connected in series, and the second current limiting resistor is connected in parallel with the voltage divider circuit.

[0015] In at least one embodiment of the present application, the output circuit and the sampling circuit are both controlled by a single chip microcomputer.

[0016] In at least one embodiment of the present application, the voltage of the power module is 4.2V.

[0017] An embodiment of the present application provides an electronic device, including a housing, a circuit board arranged in the housing, and the low-power consumption battery power sampling circuit.

[0018] The above-mentioned low-power circuit for sampling battery power is connected by setting a switch circuit to be connected to the output circuit, so that the level signal controlling the output circuit controls the on-off state of the switch circuit, and a voltage divider circuit composed of a first resistor and a second resistor is used in conjunction with the switch circuit to conduct the circuit and the divided voltage, and a sampling circuit is connected between the switch circuit and the second resistor to sample the voltage after the voltage is stepped down by the voltage divider circuit. The operation of the sampling circuit is controlled by the switch circuit, and the on-demand sampling of the battery power is realized, which effectively reduces the continuous energy consumption of the system. At the same time, the circuit structure is simplified, the interference of external factors on the sampling accuracy is reduced, the accuracy of power detection is improved, and the size of the equipment is reduced and the cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 4 is a circuit diagram of a low-power circuit for sampling battery power in an embodiment of the present application.

[0020] Figure 2 Schematic diagram of a voltage divider circuit and a switch circuit in an embodiment of the present application.

[0021] Figure 3Schematic diagram of a sampling circuit and an output circuit in an embodiment of the present application.

[0022] Main component symbols

[0023] 100. A circuit for sampling battery power with low power consumption; 10. voltage divider circuit; 20. sampling circuit; 30. output circuit; 40. power module; Q1. switch circuit; R1. first resistor; R8. second resistor; IO1. output terminal; R10. first current limiting resistor; IO2. sampling terminal; R5. second current limiting resistor; C3. filter capacitor. DETAILED DESCRIPTION

[0024] The embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0025] It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a central component at the same time. When a component is considered to be "located on" another component, it may be directly located on the other component or there may be a central component at the same time. The terms "top", "bottom", "upper", "lower", "left", "right", "front", "back", and similar expressions used herein are for illustrative purposes only.

[0026] The embodiment of the present application provides a circuit for sampling battery power with low power consumption, including a switch circuit, a voltage divider circuit, a sampling circuit and an output circuit;

[0027] The voltage divider circuit includes a first resistor and a second resistor, the switch circuit is connected between the first resistor and the second resistor, and one end of the switch circuit is connected to the power module, and the other end is connected to the ground;

[0028] The switch circuit is also connected to the output circuit to control the on and off of the switch circuit. The sampling circuit is connected between the switch circuit and the second resistor for sampling.

[0029] The above-mentioned low-power circuit for sampling battery power is connected by setting a switch circuit to be connected to the output circuit, so that the level signal controlling the output circuit controls the on-off state of the switch circuit, and a voltage divider circuit composed of a first resistor and a second resistor is used in conjunction with the switch circuit to conduct the circuit and the divided voltage, and a sampling circuit is connected between the switch circuit and the second resistor to sample the voltage after the voltage is stepped down by the voltage divider circuit. The operation of the sampling circuit is controlled by the switch circuit, and the on-demand sampling of the battery power is realized, which effectively reduces the continuous energy consumption of the system. At the same time, the circuit structure is simplified, the interference of external factors on the sampling accuracy is reduced, the accuracy of power detection is improved, and the size of the equipment is reduced and the cost is reduced.

[0030] Some embodiments of the present application are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0031] according to Figure 1-Figure 3 In an embodiment of the present application, a low-power consumption battery power sampling circuit 100 is provided, which includes a switch circuit Q1, a voltage divider circuit 10, a sampling circuit 20 and an output circuit 30.

[0032] Wherein, the voltage divider circuit 10 includes a first resistor R1 and a second resistor R8, the switch circuit Q1 is connected between the first resistor R1 and the second resistor R8, and one end of the switch circuit Q1 is connected to the power module 40, and the other end is connected to the ground; the switch circuit Q1 is also connected to the output circuit 30 to control the conduction and closing of the switch circuit Q1, and the sampling circuit 20 is connected between the switch circuit Q1 and the second resistor R8 for sampling.

[0033] Specifically, the voltage divider circuit 10 composed of the first resistor R1 and the second resistor R8 is used to obtain voltage samples from the battery. The resistance values ​​of the first resistor R1 and the second resistor R8 determine the accuracy and power consumption of the sampling, but these effects can be minimized by intelligently controlling the switch circuit Q1. The sampling circuit 20 connected between the switch circuit Q1 and the second resistor R8 is responsible for actually collecting the voltage sample and converting it into a signal for further processing. The switch circuit Q1 is turned on and off by controlling the different levels output by the output circuit 30. By using the switch circuit Q1 as a switch, low power consumption operation during sampling is achieved.

[0034] Furthermore, when it is necessary to sample the battery power, the control output circuit 30 outputs a high level, so that the switch circuit Q1 is turned on. When the switch circuit Q1 is turned on, the current passes through the first resistor R1, the switch circuit Q1 and the second resistor R8 in sequence to form a voltage divider, and the resulting voltage is read by the sampling circuit 20 connected to the switch circuit Q1 and the second resistor R8. When sampling is not required, the control output circuit 30 outputs a low level, so that the switch circuit Q1 is turned off, and almost no current flows through the voltage divider circuit 10, which greatly reduces static power consumption.

[0035] In a specific embodiment, the switch circuit Q1 is an NMOS tube, the gate of the NMOS tube is connected to the output circuit 30, the drain of the NMOS tube is connected to the power module 40 and the first resistor R1, and the source of the NMOS tube is connected to the second resistor R8 and the ground.

[0036] Specifically, the switch circuit Q1 is an NMOS tube. In the battery power monitoring application, the use of NMOS tube can effectively reduce power consumption. When the battery voltage needs to be sampled, the NMOS tube will be activated and turned on, and the rest of the time it will remain in a closed state, which greatly reduces static power consumption. The gate of the NMOS tube is connected to the output circuit 30, and the state of the switch circuit Q1 is changed by controlling the output circuit 30. The drain of the NMOS tube is connected between the power module 40 and the first resistor R1, so that when the NMOS tube is turned on, the current can flow directly from the power module 40 through the first resistor R1 to the NMOS tube, forming an efficient current path. The source of the NMOS tube is simultaneously connected to the second resistor R8 and the ground end of the circuit. The source is directly grounded, providing a return path for the current, and also participating in forming another part of the voltage divider.

[0037] Furthermore, the output circuit 30 sends a level signal to the gate of the NMOS tube according to the sampling needs. When the gate receives a high level signal, the NMOS tube is turned on, and the current flows from the power module 40 through the first resistor R1 through the drain and source of the NMOS tube, and reaches the ground through the second resistor R8. During the conduction period of the NMOS tube, the voltage divider circuit 10 is composed of the first resistor R1 and the second resistor R8, generating a smaller voltage value proportional to the battery voltage. The sampling circuit 20 samples the voltage value. Once the sampling is completed, the control circuit turns off the NMOS tube, cuts off the current path, and the system returns to a low power consumption state until the next sampling cycle.

[0038] In a specific embodiment, the output circuit 30 includes an output terminal IO1 , and the output terminal IO1 is connected to the gate of the NMOS transistor.

[0039] Specifically, the output terminal IO1 serves as an interface for the control signal, allowing an external controller or processor to adjust the working state of the NMOS tube by changing its voltage state. The gate of the NMOS tube directly receives the control signal from the output terminal IO1, which can achieve a fast response. When the output terminal IO1 outputs a high level, the NMOS tube is turned on and the voltage divider circuit 10 works; when the output terminal IO1 outputs a low level, the NMOS tube is turned off and the voltage divider circuit 10 stops working.

[0040] In a specific embodiment, the output circuit 30 further includes a first current limiting resistor R10, and the first current limiting resistor R10 is connected between the output terminal IO1 and the gate of the NMOS transistor.

[0041] Specifically, the first current limiting resistor R10 is used to limit the current flowing to the gate of the NMOS tube, which can prevent the current surge from directly impacting the gate of the NMOS tube and protect the NMOS tube from being damaged by excessive current.

[0042] In a specific embodiment, the sampling circuit 20 includes a sampling terminal IO2, and the sampling terminal IO2 is connected to the source of the NMOS transistor.

[0043] Specifically, the sampling terminal IO2 is directly connected to the source of the NMOS tube as a collection point of the battery power signal, so that the sampling terminal IO2 can obtain the voltage signal adjusted by the NMOS tube and the voltage divider circuit 10, thereby reflecting the real-time power status of the battery.

[0044] In a specific embodiment, the sampling circuit 20 further includes a second current limiting resistor R5 and a filter capacitor C3, wherein the second current limiting resistor R5 is connected between the sampling terminal IO2 and the source of the NMOS tube, and the filter capacitor C3 and the ground are connected to the sampling terminal IO2.

[0045] Specifically, the second current limiting resistor R5 is located between the sampling terminal IO2 and the source of the NMOS tube, and is used to limit the current flowing through this path to prevent potential damage to downstream components due to a sudden increase in current. The filter capacitor C3 is connected to the ground terminal of the sampling terminal IO2. Its main function is to filter out high-frequency noise in the voltage signal to ensure that the sampling terminal IO2 receives an accurate voltage signal.

[0046] In a specific embodiment, the first resistor R1 and the second resistor R8 are connected in series, and the sampling terminal IO2 and the voltage divider circuit 10 are connected in parallel.

[0047] Specifically, the first resistor R1 and the second resistor R8 are connected in series so that they are connected to the same node to form a voltage divider network. The voltage divider circuit 10 composed of the first resistor R1 and the second resistor R8 is connected in parallel to the sampling terminal IO2 so that the sampling terminal IO2 directly obtains the voltage value after voltage division.

[0048] In a specific embodiment, the output circuit 30 and the sampling circuit 20 are both controlled by a single chip microcomputer.

[0049] Specifically, the single chip microcomputer controls the output terminal IO1 in the output circuit 30 to give high and low levels, so that the output circuit 30 controls the on and off state of the switch circuit Q1 according to different level signals, and the single chip microcomputer processes the sampling circuit 20 to collect the battery power.

[0050] In a specific embodiment, the voltage of the power module 40 is 4.2 V. An electronic device comprises a housing, a circuit board arranged in the housing, and the low-power consumption battery power sampling circuit.

[0051] The low-power battery power sampling circuit of the present application can be applied to all battery power sampling circuits, and is particularly suitable for small-sized or wearable smart products, which can greatly save energy consumption.

[0052] Thus, the circuit 100 for sampling battery power with low power consumption provided above is connected to the output circuit 30 by setting the switch circuit Q1, so that the level signal controlling the output circuit 30 controls the on / off state of the switch circuit Q1, and the voltage divider circuit 10 composed of the first resistor R1 and the second resistor R8 is used in conjunction with the switch circuit Q1 to conduct the circuit and the voltage divider, and the sampling circuit 20 is connected between the switch circuit Q1 and the second resistor R8 to sample the voltage after the voltage is stepped down by the voltage divider circuit 10. By controlling the operation of the sampling circuit 20 through the switch circuit Q1, the on-demand sampling of the battery power is realized, and the continuous energy consumption of the system is effectively reduced. At the same time, the circuit structure is simplified, the interference of external factors on the sampling accuracy is reduced, the accuracy of power detection is improved, and the size of the equipment is reduced and the cost is reduced.

[0053] The above is only an implementation method of the present application. It should be pointed out that a person skilled in the art can make improvements without departing from the inventive concept of the present application, but these improvements are within the scope of protection of the present application.

Claims

1. A low-power circuit for sampling battery power, characterized in that: It includes a switch circuit, a voltage divider circuit, a sampling circuit and an output circuit; The voltage divider circuit includes a first resistor and a second resistor, the switch circuit is connected between the first resistor and the second resistor, and one end of the switch circuit is connected to the power module, and the other end is connected to the ground; The switch circuit is also connected to the output circuit to control the on and off of the switch circuit. The sampling circuit is connected between the switch circuit and the second resistor for sampling.

2. A low-power consumption battery power sampling circuit according to claim 1, characterized in that: The switch circuit is an NMOS tube, the gate of the NMOS tube is connected to the output circuit, the drain of the NMOS tube is connected to the power module and the first resistor, and the source of the NMOS tube is connected to the second resistor and the ground.

3. A low-power consumption battery power sampling circuit according to claim 2, characterized in that: The output circuit includes an output terminal, and the output terminal is connected to the gate of the NMOS tube.

4. A low-power consumption battery power sampling circuit according to claim 3, characterized in that: The output circuit further includes a first current limiting resistor, which is connected between the output terminal and the gate of the NMOS tube.

5. The low-power consumption battery power sampling circuit according to claim 2, characterized in that: The sampling circuit includes a sampling terminal connected to the source of the NMOS tube.

6. A low-power consumption battery power sampling circuit according to claim 5, characterized in that: The sampling circuit further includes a second current limiting resistor and a filter capacitor. The second current limiting resistor is connected between the sampling terminal and the source of the NMOS tube. The filter capacitor and the ground terminal are connected to the sampling terminal.

7. A low-power consumption battery power sampling circuit according to claim 6, characterized in that: The first resistor and the second resistor are connected in series, and the second current limiting resistor is connected in parallel with the voltage divider circuit.

8. The low-power consumption battery power sampling circuit according to claim 1, characterized in that: The output circuit and the sampling circuit are both controlled by a single chip microcomputer.

9. The low-power consumption battery power sampling circuit according to claim 1, characterized in that: The voltage of the power module is 4.2V.

10. An electronic device, characterized in that: The invention comprises a housing, a circuit board arranged in the housing, and a circuit for sampling battery power with low power consumption as claimed in any one of claims 1 to 9.

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