Button cell low-power-consumption energy storage circuit

Abstract

The utility model belongs to the field of button cell circuits, and particularly relates to a low-power-consumption energy storage circuit of a button cell, which comprises an energy storage element and an energy storage switch circuit. The energy storage element is used for storing electric energy and providing energy reserve for the switching power supply and the load; the energy storage switch circuit automatically controls the charging and discharging states of the energy storage element according to an instruction of the main control chip, and can cut off a loop to the ground of the energy storage element under the condition that the switch is switched off; through a low-cost scheme, the problem of high power consumption of a common capacitive energy storage circuit in current wearable equipment is solved, the problem of overhigh power consumption caused by the fact that an energy storage element is in an unstable working state for a long time is well solved, meanwhile, the energy storage element is activated when the energy storage element needs to work, the requirement of the wearable equipment for electric energy storage is not influenced, and the energy storage efficiency is improved. According to the scheme, the number of added elements is small, the cost advantage is large, and the button cell power supply wearable device is especially suitable for long-term standby.

Description

Technical Field

[0001] The utility model belongs to the field of button battery circuits, in particular to a button battery low-power energy storage circuit. Background Art

[0002] With the continuous advancement of technology, miniature wearable products have been widely used in daily life. These products usually rely on button batteries to provide energy. However, due to the limitations of button batteries, product designers are faced with the problems of weak battery discharge capacity and high power consumption of energy storage circuits, resulting in shortened battery life and frequent battery replacement.

[0003] Low-power energy storage circuits are widely used to extend battery life. These circuits can capture and store the energy discharged by the battery and release it when needed, thereby solving the problem of weak battery discharge capacity. However, existing low-power energy storage circuits still have some problems, including high power consumption, large size, and high cost, which are not suitable for micro-wearable products.

[0004] To this end, the utility model provides a low-power energy storage circuit for a button battery. Utility Model Content

[0005] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0006] The technical solution adopted by the utility model to solve the technical problem is: the low-power consumption energy storage circuit of a button battery described in the utility model comprises an energy storage element and an energy storage switch circuit;

[0007] The energy storage element is used to store electrical energy and provide energy reserve for the switching power supply and the load;

[0008] The energy storage switch circuit automatically controls the charge and discharge state of the energy storage element according to the instructions of the main control chip, and can cut off the energy storage element's ground loop when the switch is disconnected.

[0009] Preferably, the negative terminal of the energy storage element is connected to the main control chip through an energy storage switch circuit.

[0010] Preferably, the energy storage element comprises N capacitors, the positive end of which is connected to the positive end of the button battery, and the negative end of which is connected to the drain of the first MOSFET of the energy storage switch circuit.

[0011] Preferably, the energy storage switch circuit comprises a first MOSFET, a first resistor, and a second resistor, wherein the first MOSFET is an N-channel MOSFET. The drain of the first MOSFET is connected to the negative terminal of the capacitor, the source of the first MOSFET is connected to the main control chip via the first resistor, the source of the first MOSFET is connected to ground via the second resistor, and the gate of the first MOSFET is grounded.

[0012] The beneficial effects of the utility model are as follows:

[0013] 1. The low-power energy storage circuit for button batteries described in the present invention solves the problem of high power consumption of capacitor energy storage circuits commonly used in current wearable devices through a low-cost solution. It also effectively solves the problem of excessive power consumption caused by the energy storage element being in an unstable working state for a long time. At the same time, the energy storage element is activated when it is needed to work, which does not affect the wearable device's demand for power reserves. This solution uses fewer additional components and has a great cost advantage. It is particularly suitable for wearable devices powered by button batteries that are on standby for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described below with reference to the accompanying drawings.

[0015] Figure 1 This is the circuit diagram of the commonly used capacitor energy storage circuit in daily life;

[0016] Figure 2 This is a circuit implementation block diagram of the energy storage circuit in the utility model;

[0017] Figure 3 This is the circuit implementation principle of the energy storage circuit in the utility model. DETAILED DESCRIPTION

[0018] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] Specific examples are given below.

[0020] like Figures 1 to 3 As shown, a low-power energy storage circuit for a button battery according to an embodiment of the present invention is provided. In order to achieve the purpose of the present invention, please refer to Figure 2 As shown, the utility model circuit comparison Figure 1 , mainly provides a switching circuit for controlling energy storage elements.

[0021] The utility model low power consumption energy storage circuit is implemented Figure 3 The content in the dotted box.

[0022] In wearable devices, due to the limitations of button batteries and the size of wearable devices, multiple capacitors are usually used as energy storage elements. When an external electric field is applied to both ends of the capacitor, positive and negative voltages are accumulated at both ends of the capacitor. When the voltage difference between the two ends of the capacitor rises to the power supply voltage, the capacitor stops charging. At this time, even if the external circuit is disconnected, the charge at both ends of the capacitor will not disappear. The charges at both ends attract each other and form the effect of storing energy.

[0023] Capacitance is not equivalent to an open circuit in a circuit, although it can produce an effect that appears to interrupt the current. When a capacitor is just connected to or disconnected from a power source, it can show a temporary current flow phenomenon. This current flow is only instantaneous and will quickly weaken and eventually stop. Therefore, a capacitor does not form a continuous current path under long-term stable working conditions, but in some cases, it may allow current to flow for a short time.

[0024] In wearable devices, when capacitors are used as energy storage components, commonly used circuits such as Figure 1 As shown in the figure, capacitors are generally close to the power consumption side, and the power consumption side preferentially draws power from the capacitor, causing the capacitor to charge and discharge repeatedly. According to the characteristics of the above capacitors, in the non-steady-state working state of long-term charge and discharge, the capacitor itself continuously discharges weak current, resulting in an increase in overall power consumption.

[0025] The utility model provides an energy storage switch circuit to solve the above problems. The energy storage element is enabled only when there is a high current demand, and is turned off in low current scenarios such as standby mode, thereby reducing the increase in power consumption caused by the non-steady-state working state of the energy storage element. The specific circuit is as follows Figure 3 As shown in FIG, when the main control chip sends a low level, Q1 is cut off, the negative pole of the capacitor Cn is floating, and the capacitor Cn does not become a completely closed circuit. There is no direct current path to pass through the capacitor Cn.

[0026] Based on the above requirements, when the main control chip sends a high level, Q1 turns on and capacitor Cn is grounded, forming a closed loop, allowing capacitor Cn to store energy normally. R1 acts as a current limiter, preventing excessive current from flowing into the base to avoid oversaturation or damage to Q1.

[0027] R2 controls the voltage distribution and keeps the DC operating point of the control circuit constant, ensuring that Q1 is stably turned on.

[0028] These technical features combined together make the circuit of the present invention have broad application prospects in micro-sized products and small wearable products, and can provide longer battery life and higher performance.

[0029] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. A button battery low-power energy storage circuit, characterized by: Including energy storage elements and energy storage switching circuits; The energy storage element is used to store electrical energy and provide energy reserve for the switching power supply and the load; The energy storage switch circuit automatically controls the charge and discharge state of the energy storage element according to the instructions of the main control chip, and can cut off the energy storage element's ground loop when the switch is disconnected.

2. The low-power button battery energy storage circuit according to claim 1, characterized in that: The negative end of the energy storage element is connected to the main control chip through an energy storage switch circuit.

3. The low-power button battery energy storage circuit according to claim 2, characterized in that: The energy storage element includes N capacitors, the positive end of which is connected to the positive end of the button battery, and the negative end of which is connected to the drain of the first MOSFET of the energy storage switch circuit.

4. The low-power button battery energy storage circuit according to claim 3, characterized in that: The energy storage switch circuit includes a first MOSFET, a first resistor, and a second resistor, wherein the first MOSFET is an N-channel MOSFET, the drain of the first MOSFET is connected to the negative end of the capacitor, the source of the first MOSFET is connected to the main control chip through the first resistor, the source of the first MOSFET is connected to the ground through the second resistor, and the gate of the first MOSFET is grounded.

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