Power switch multiplexing circuit

Abstract

The invention relates to a power switch multiplexing circuit, which belongs to the technical field of control circuits and comprises a battery, a key, a module A and a module B, the module A and the module B are independent function modules; the voltage range of the battery meets the default voltage of the switch pins of the module A and the module B; the battery and the key are connected in series and then are connected with the first resistor and the second resistor which are connected in parallel; the first resistor and the second resistor are respectively connected with the module A and the module B through an MOS (Metal Oxide Semiconductor) tube; a D pin of the MOS tube is connected with the module A or the module B, an S pin of the MOS tube is connected with one end of a grounding wire of the first resistor or the second resistor, and the other end of the grounding wire is connected with a G pin of the MOS tube; and the MOS tube is an N-MOSET (Metal Oxide Semiconductor Transistor) According to the invention, the MOS tube is arranged on the circuit through which the battery and the key are connected to the module A and the module B, so that the multiplexing of the switch key is realized, and the function of opening and closing the module A and the module B is realized; the circuit size is reduced, and the structure is simple.

Description

Technical Field

[0001] The invention belongs to the technical field of control circuits, and in particular relates to a power switch multiplexing circuit. Background Art

[0002] There are two independent functional modules inside the device, defined as module A and module B. Both modules are powered by internal batteries. The circuit logic is as follows: Figure 1 As shown, two switches need to be turned on separately.

[0003] Module A has a display switch. Press the switch for 60ms to turn on the display function of module A and turn it off automatically after 1 minute. The display switch trigger logic is to pull the switch pin on the main chip of module A down for more than 60ms. This function is a common function of the device, and the user will press the display switch from time to time as needed.

[0004] Module B has a power switch. Press the switch for 3 seconds to turn on module B. Press the switch again for 3 seconds to turn off module B, and the cycle repeats. The power switch trigger logic is to pull the switch pin on the module B switch chip down for 3 seconds, and the switch chip outputs the power-on level. Pull the pin down again for 3 seconds, and the switch chip outputs the shutdown level, and the cycle repeats. If the pin is pulled down for less than 3 seconds, the chip will not work.

[0005] The default voltages of the switch pins of the above two modules are different. Directly connecting the two pins in parallel to the switch will cause the circuit to work abnormally. However, arranging two switches inside the device will increase the circuit volume. In order to simplify the circuit structure, it is necessary to design a method that uses one switch to realize the opening and closing of two independent functional modules with different voltages. Summary of the invention

[0006] The present invention provides a power switch multiplexing circuit to solve the technical problems existing in the known technology. The circuit volume is simplified by controlling the opening and closing of two independent functional modules with different voltages through one switch.

[0007] The present invention includes the following technical solutions:

[0008] A power switch multiplexing circuit comprises a battery, a button, a module A and a module B; the module A and the module B are both independent functional modules; the voltage range of the battery meets the default voltage of the switch pins of the module A and the module B; the battery is connected in series with the button and then connected with a first resistor and a second resistor in parallel, the first resistor and the second resistor are respectively connected with the module A and the module B through a MOS tube; the D pin of the MOS tube is connected to the module A or the module B, the S pin of the MOS tube is connected to one end of the ground wire of the first resistor or the second resistor, and the other end is connected to the G pin of the MOS tube; the MOS tube is an N-MOS.

[0009] Furthermore, the threshold voltage (Vgs(th)) of the MOS tube is 1.4V@250uA.

[0010] Furthermore, the drain-source voltage (Vdss) of the MOS tube is 30V.

[0011] Furthermore, the gate-source voltage (Vgs) of the MOS tube is ±12V.

[0012] Furthermore, the voltage of the battery is 3V-4.2V.

[0013] Furthermore, the module A has a display switch pin.

[0014] Furthermore, the module B has a power switch pin.

[0015] The present invention has the advantages and positive effects:

[0016] 1. The present invention realizes the reuse of switch buttons by arranging MOS tubes on the circuits where the battery and the buttons are connected to the modules A and B, thereby realizing the function of opening and closing the modules A and B.

[0017] 2. The present invention simplifies the circuit volume, saves silicon chip area and has a simple structure. The simplified process is more conducive to large-scale integration. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of a prior art circuit;

[0019] Figure 2 It is a schematic diagram of the circuit structure of the present invention;

[0020] In the figure, T is a button; R1 is a first resistor; and R2 is a second resistor. DETAILED DESCRIPTION

[0021] In order to further disclose the content, features and effects of the present invention, the following examples are specifically cited and described in detail in conjunction with the accompanying drawings. In the description of the following embodiments, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing this patent and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this patent.

[0022] In the description of the following embodiments, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, it can be fixedly connected or set, or it can be detachably connected or set, or connected or set in one piece. For ordinary technicians in this field, the specific meanings of the above terms in this patent can be understood according to specific circumstances.

[0023] Example: See attached Figure 2 A power switch multiplexing circuit includes a battery, a button, a module A and a module B; the module A and the module B are both independent functional modules; the voltage range of the battery meets the default voltage of the switch pins of the module A and the module B; the voltage of the battery is 3V-4.2V. The module A has a display switch pin; the module B has a power switch pin.

[0024] The battery is connected in series with the button and then connected to the first resistor R1 and the second resistor R2 in parallel. The first resistor R1 is connected to module A through MOS tube 1. The D pin of the MOS tube 1 is connected to module A, the S pin of the MOS tube 1 is connected to one end of the grounding wire of the first resistor R1, and the other end of the first resistor R1 is connected to the G pin of the MOS tube 1. The second resistor R2 is connected to module B through MOS tube 2; the D pin of the MOS tube 2 is connected to module B, the S pin of the MOS tube 2 is connected to one end of the grounding wire of the second resistor R2, and the other end of the second resistor R2 is connected to the G pin of the MOS tube 2.

[0025] The MOS tube 1 and the MOS tube 2 are both N-MOS SETs. The threshold voltage (Vgs(th)) of the MOS tube 1 and the MOS tube 2 is 1.4V@250uA. The drain-source voltage (Vdss) of the MOS tube 1 and the MOS tube 2 is 30V. The gate-source voltage (Vgs) of the MOS tube 1 and the MOS tube 2 is ±12V.

[0026] Working process:

[0027] When only the display function of module A needs to be turned on, after pressing the button, both MOS tube 1 and MOS tube 2 are turned on, and the display starts after pressing the button for 60ms. After releasing the button, both MOS tube 1 and MOS tube 2 are turned on and off, and module B is still in the shutdown state.

[0028] When module B needs to be turned on, after pressing the button, the MOS tube 1 and MOS tube 2 are turned on, the button is pressed for 60ms and the display starts, and module B is turned on after pressing for 3S, and the display automatically turns off after 1 minute. The shutdown process of module B is the same as the startup process.

[0029] Although the preferred embodiments of the present invention are described above, the present invention is not limited to the above specific embodiments, which are merely illustrative and not restrictive. Under the guidance of the present invention, a person skilled in the art can make many forms without departing from the scope of the present invention and the claims. All of these belong to the protection scope of the present invention.

Claims

1. A power switch multiplexing circuit, comprising a battery, a button, a module A and a module B; the module A and the module B are both independent functional modules, characterized in that: The voltage range of the battery meets the default voltage of the switch pins of module A and module B; the battery is connected in series with the key and then connected to the first resistor and the second resistor in parallel, and the first resistor and the second resistor are respectively connected to module A and module B through a MOS tube; the D pin of the MOS tube is connected to module A or module B, the S pin of the MOS tube is connected to one end of the ground wire of the first resistor or the second resistor, and the other end is connected to the G pin of the MOS tube; the MOS tube is an N-MOSSET.

2. A power switch multiplexing circuit according to claim 1, characterized in that: The threshold voltage of the MOS tube is 1.4V@250uA.

3. The power switch multiplexing circuit according to claim 1, characterized in that: The drain-source voltage of the MOS tube is 30V.

4. The power switch multiplexing circuit according to claim 1, characterized in that: The gate-source voltage of the MOS tube is ±12V.

5. A power switch multiplexing circuit according to any one of claims 1 to 4, characterized in that: The voltage of the battery is 3V-4.2V.

6. A power switch multiplexing circuit according to claim 5, characterized in that: The module A has a display switch pin.

7. The power switch multiplexing circuit according to claim 5, characterized in that: The module B has a power switch pin.

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