Key output circuit and circuit board

Abstract

The utility model discloses a kind of key output circuit and circuit board, including half-wave rectification module, key switch and the switching tube of semiconductor, key switch is connected with half-wave rectification module to constitute at least partial key trigger branch, the first end of the key trigger branch is connected with alternating current power supply, the tail end of the key trigger branch is connected with the controlled end of the switching tube, the input end of the switching tube is used to be connected with controller, the output end of the switching tube is grounded, the design control is sensitive, convenient and reliable.

Description

Technical Field

[0001] This utility model relates to the field of electronic circuit technology, and in particular to a key output circuit and circuit board. Background Technology

[0002] In existing push-button switch trigger circuits, the first end of the push-button switch is connected to a DC power supply, which is usually obtained by rectifying the AC power supply using a full-bridge rectifier. The second end of the push-button switch is connected to the controlled terminal of a semiconductor switching transistor. The input terminal of the switching transistor is connected to the controller, and the output terminal of the switching transistor is grounded. When the user presses the push-button switch, it closes, the switching transistor conducts, and the controller receives the control signal. The switching transistor will only conduct when the voltage is higher than its turn-on threshold, and will turn off when it is lower than the turn-on threshold. However, because a full-cycle sine wave signal is formed under full-bridge rectification, the period below the turn-on threshold is short. The controller detects the rising or falling edge signal to trigger the circuit. The short period makes it difficult for the controller to obtain the rising or falling edge signal in the capture cycle, resulting in unresponsive control. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a key output circuit and circuit board that is sensitive to operation and convenient and reliable to use.

[0004] A key output circuit according to a first aspect of the present invention includes: a half-wave rectifier module; a key switch connected to the half-wave rectifier module to form at least a partial key trigger branch, the first end of the key trigger branch being connected to an AC power supply; and a semiconductor switching transistor, the tail end of the key trigger branch being connected to the controlled end of the switching transistor, the input end of the switching transistor being connected to a controller, and the output end of the switching transistor being grounded.

[0005] A button output circuit according to an embodiment of the present utility model has at least the following beneficial effects:

[0006] This utility model's button output circuit uses a half-wave rectifier module to rectify the AC power supply, forming a sine wave signal of half a cycle. The portion of the sine wave signal above the voltage threshold is slightly smaller than the portion below the voltage threshold. The sine wave signal controls the switching transistor to turn on and off. The controller generates control commands by acquiring the rising or falling edge signal. This design is sensitive to control and convenient and reliable to use.

[0007] According to some embodiments of the present invention, the half-wave rectifier module includes a diode D1, the first end of the push-button switch is connected to an AC power supply, the positive terminal of the diode D1 is connected to the tail end of the push-button switch, and the negative terminal of the diode D1 is connected to the controlled terminal of the switching transistor.

[0008] According to some embodiments of this utility model, the half-wave rectifier module further includes resistors R1, R2, and R3, and capacitor C1. The first end of resistor R1 is connected to the last end of the push-button switch. The positive terminal of diode D1 is connected to the last end of resistor R1. The negative terminal of diode D1 is connected to the first end of resistor R2. The last end of resistor R2 is connected to the first end of resistor R3, the first end of capacitor C1, and the controlled terminal of the switching transistor. The last ends of resistor R3 and capacitor C1 are both grounded.

[0009] According to some embodiments of this utility model, the switching transistor includes a bipolar transistor or a MOSFET.

[0010] According to some embodiments of this utility model, the button output circuit further includes resistors R4 and R5 and capacitor C2. The switching transistor includes a switching transistor Q1. The first end of resistor R4 is connected to a DC power supply. The last end of resistor R4 is connected to the input terminal of switching transistor Q1 and the first end of resistor R5. The controlled terminal of switching transistor Q1 is connected to the last end of the button triggering branch. The last end of resistor R5 is connected to the first end of capacitor C2 and the controller. The output terminal of switching transistor Q1 and the last end of capacitor C2 are both grounded.

[0011] According to some embodiments of the present invention, the controller includes an electrical edge signal input terminal, which is connected to the input terminal of the switching transistor.

[0012] According to a second aspect of the present invention, a circuit board includes a circuit board body, on which a controller and at least one key output circuit disclosed in any of the above embodiments are provided, and the controller is connected to the input terminal of the switch tube in the key output circuit.

[0013] The circuit board according to the embodiments of this utility model has at least the following beneficial effects:

[0014] The circuit board of this utility model adopts the key output circuit disclosed in any of the above embodiments. This design is sensitive to operation and convenient and reliable to use.

[0015] According to some embodiments of this utility model, the button output circuit has three channels, and the input terminals of the switching transistors in the three button output circuits are all connected to the controller.

[0016] According to some embodiments of the present invention, the circuit board body is provided with a plug-in electrical connection terminal, which includes a power terminal and a plurality of switch terminals. The power terminal is used to connect to the AC power supply and the first end of the button switch of each of the button output circuits. Each of the switch terminals is connected to the tail end of the button switch of each of the button output circuits in a corresponding manner, and each of the switch terminals is connected to the controlled end of the switch tube of each of the button output circuits in a corresponding manner.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is a schematic block diagram of one embodiment of the key output circuit of this utility model;

[0020] Figure 2 This is a circuit diagram of one embodiment of the button output circuit of this utility model.

[0021] Figure label:

[0022] Half-wave rectifier module 100; push-button switch 200; switching transistor 300; controller 400; plug-in electrical connector 500; power supply terminal 510; switch terminal 520. Detailed Implementation

[0023] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0024] In the description of this utility model, it should be understood that the directional descriptions, such as the terms "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element 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.

[0025] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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.

[0027] like Figure 1 , 2 As shown, a key output circuit according to a first aspect embodiment of the present invention includes a half-wave rectifier module 100, a key switch 200, and a semiconductor switching transistor 300. The key switch 200 is connected to the half-wave rectifier module 100 to form at least a partial key trigger branch. The first end of the key trigger branch is connected to an AC power supply, and the last end of the key trigger branch is connected to the controlled end of the switching transistor 300. The input end of the switching transistor 300 is used to connect to a controller 400, and the output end of the switching transistor 300 is grounded.

[0028] It should be noted that the controller 400 can be selected from chips with processing functions such as MCU and CPU and their auxiliary circuits. Specifically, the controller 400 includes an edge signal input terminal, which is connected to the input terminal of the switching transistor 300.

[0029] The push-button switch 200 can be a self-resetting push-button switch, a self-locking push-button switch, a touch switch, etc. In some embodiments of this utility model, the switch transistor 300 includes a transistor or a MOSFET.

[0030] This utility model's button output circuit uses a half-wave rectifier module 100 to rectify the AC power supply, forming a sine wave signal for half a cycle. The portion of the sine wave signal above the voltage threshold is slightly smaller than the portion below the voltage threshold. The sine wave signal controls the switching transistor 300 to turn on and off. The controller 400 generates control commands by acquiring the rising or falling edge signal. This design is sensitive to control and convenient and reliable to use.

[0031] In some embodiments of this utility model, the half-wave rectifier module 100 includes a diode D1, the first end of the push-button switch 200 is connected to an AC power supply, the positive terminal of the diode D1 is connected to the tail end of the push-button switch 200, and the negative terminal of the diode D1 is connected to the controlled terminal of the switching transistor 300.

[0032] The unidirectional conductivity of diode D1 is used to rectify the AC power supply, forming a half-cycle sine wave signal, which is used to drive the switching transistor 300 to turn on and off.

[0033] In some embodiments of this utility model, such as Figure 2 As shown, the half-wave rectifier module 100 also includes resistors R1, R2, and R3, and capacitor C1. The first end of resistor R1 is connected to the last end of the push-button switch 200. The positive terminal of diode D1 is connected to the last end of resistor R1, and the negative terminal of diode D1 is connected to the first end of resistor R2. The last end of resistor R2 is connected to the first end of resistor R3, the first end of capacitor C1, and the controlled terminal of switch transistor 300. The last ends of resistor R3 and capacitor C1 are both grounded.

[0034] Resistor R1 limits the current of the power supply, resistors R2 and R3 divide the voltage, and capacitor C1 filters and stably triggers the switching transistor 300 to turn on and off.

[0035] In some embodiments of this utility model, such as Figure 2 As shown, the button output circuit also includes resistors R4 and R5 and capacitor C2. The switching transistor 300 includes a switching transistor 300Q1. The first end of resistor R4 is connected to the DC power supply. The last end of resistor R4 is connected to the input terminal of switching transistor 300Q1 and the first end of resistor R5. The controlled terminal of switching transistor 300Q1 is connected to the last end of the button triggering branch. The last end of resistor R5 is connected to the first end of capacitor C2 and the controller 400. The output terminal of switching transistor 300Q1 and the last end of capacitor C2 are both grounded.

[0036] Resistors R4 and R5, along with capacitor C2, filter the trigger signal generated by the switching transistor 300 and input it into the controller 400.

[0037] According to a second aspect embodiment of the present invention, a circuit board includes a circuit board body, on which a controller 400 and at least one key output circuit disclosed in any of the above embodiments are provided, and the controller 400 is connected to the input terminal of the switch tube 300 in the key output circuit.

[0038] The circuit board of this utility model adopts the key output circuit disclosed in any of the above embodiments. This design is sensitive to operation and convenient and reliable to use.

[0039] In some embodiments of this utility model, the button output circuit has three channels, and the input terminals of the switching transistors 300 of the three button output circuits are all connected to the controller 400. Multiple button switches 200 can correspond to different gears or functions, and output control commands to the controller 400 through their respective button output circuits.

[0040] In some embodiments of this utility model, the circuit board body is provided with a plug-in electrical connection terminal 500. The plug-in electrical connection terminal 500 includes a power terminal 510 and a plurality of switch terminals 520. The power terminal 510 is used to connect to the AC power supply and the first end of the button switch 200 of each of the button output circuits. Each of the switch terminals 520 is connected to the tail end of the button switch 200 of each of the button output circuits, and each of the switch terminals 520 is connected to the controlled end of the switch tube 300 of each of the button output circuits.

[0041] The electrical connector 500 can be detachably connected to the AC power supply and the push-button switch 200 to facilitate the maintenance and replacement of the corresponding electronic components.

[0042] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0043] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A key output circuit, characterized in that, include: Half-wave rectifier module; A push-button switch is connected to a half-wave rectifier module to form at least a partial push-button trigger branch, the first end of which is connected to an AC power supply. The semiconductor switching transistor has its tail end connected to the controlled terminal of the button trigger branch, its input terminal connected to the controller, and its output terminal grounded.

2. The key output circuit according to claim 1, characterized in that: The half-wave rectifier module includes a diode D1. The first end of the push-button switch is connected to the AC power supply. The positive terminal of the diode D1 is connected to the tail end of the push-button switch. The negative terminal of the diode D1 is connected to the controlled terminal of the switching transistor.

3. A key output circuit according to claim 2, characterized in that: The half-wave rectifier module also includes resistors R1, R2, and R3, and capacitor C1. The first end of resistor R1 is connected to the last end of the push-button switch. The positive terminal of diode D1 is connected to the last end of resistor R1, and the negative terminal of diode D1 is connected to the first end of resistor R2. The last end of resistor R2 is connected to the first end of resistor R3, the first end of capacitor C1, and the controlled terminal of the switching transistor. The last ends of resistor R3 and capacitor C1 are both grounded.

4. A key output circuit according to claim 1, characterized in that: The switching transistor includes a bipolar transistor or a MOSFET.

5. A key output circuit according to claim 1, characterized in that, It also includes resistors R4 and R5 and capacitor C2. The switching transistor includes a switching transistor Q1. The first end of resistor R4 is connected to the DC power supply. The second end of resistor R4 is connected to the input terminal of switching transistor Q1 and the first end of resistor R5. The controlled terminal of switching transistor Q1 is connected to the second end of the button triggering branch. The second end of resistor R5 is connected to the first end of capacitor C2 and the controller. The output terminal of switching transistor Q1 and the second end of capacitor C2 are both grounded.

6. A key output circuit according to claim 1, characterized in that, The controller includes an edge signal input terminal, which is connected to the input terminal of the switching transistor.

7. A circuit board, characterized in that, The circuit board includes a circuit board body, on which a controller and at least one key output circuit as described in any one of claims 1 to 6 are provided, wherein the controller is connected to the input terminal of the switching transistor in the key output circuit.

8. A circuit board according to claim 7, characterized in that: The button output circuit has three channels, and the input terminals of the switching transistors in all three button output circuits are connected to the controller.

9. A circuit board according to claim 8, characterized in that, The circuit board body is provided with plug-in electrical connection terminals, which include power terminals and multiple switch terminals. The power terminals are used to connect to the AC power supply and the first end of the button switch of each of the button output circuits. Each of the switch terminals is connected to the tail end of the button switch of each of the button output circuits, and each of the switch terminals is connected to the controlled end of the switching transistor of each of the button output circuits.

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