阅读说明：本技术 抗静电电路和电子设备 (Antistatic circuit and electronic device ) 是由 王世强 胡震宇 于 2020-05-09 设计创作，主要内容包括：本发明提供了一种触摸按键的抗静电电路以及电子设备,抗静电电路包括主控模块、触摸芯片模块、第一静电保护器、第二静电保护器、输入导线和输出导线,触摸芯片模块通过输入导线接收主控模块的电信号,触摸芯片模块通过输出导线向主控模块发送信号,第一静电保护器的一端电连接于输入导线,第一静电保护器的另一端接地,第二静电保护器的一端电连接于输出导线,第二静电保护器的另一端接地。通过设置第一静电保护器和第二静电保护器,第一静电保护器一端电连接于输入导线,另一端接地,从而将触摸芯片模块的输入端通过第一静电保护器接地,同样的,输出端通过第二静电保护器接地,使得静电能够通过第一静电保护器和第二静电保护器排泄完全。(The invention provides an antistatic circuit of a touch key and electronic equipment, wherein the antistatic circuit comprises a main control module, a touch chip module, a first electrostatic protector, a second electrostatic protector, an input lead and an output lead, the touch chip module receives an electric signal of the main control module through the input lead, the touch chip module sends a signal to the main control module through the output lead, one end of the first electrostatic protector is electrically connected to the input lead, the other end of the first electrostatic protector is grounded, one end of the second electrostatic protector is electrically connected to the output lead, and the other end of the second electrostatic protector is grounded. Through setting up first electrostatic protection ware and second electrostatic protection ware, first electrostatic protection ware one end electricity is connected in the input wire, and other end ground connection to the input that will touch the chip module passes through first electrostatic protection ware ground connection, and is the same, and the output passes through second electrostatic protection ware ground connection, makes static can excrete completely through first electrostatic protection ware and second electrostatic protection ware.)

1. The utility model provides an antistatic circuit of touch button, its characterized in that, includes host system, touch chip module, first electrostatic protection ware, second electrostatic protection ware, input wire and output wire, the touch chip module passes through the input wire is received host system's the signal of telecommunication, the touch chip module passes through the output wire to host system sends a signal, the one end electricity of first electrostatic protection ware is connected in the input wire, the other end ground connection of first electrostatic protection ware, the one end electricity of second electrostatic protection ware is connected in the output wire, the other end ground connection of second electrostatic protection ware.

2. The antistatic circuit of claim 1 further comprising a third electrostatic protector and a power supply wire, wherein the main control module is connected to a power supply through the power supply wire, one end of the third electrostatic protector is electrically connected to the power supply wire, and the other end of the third electrostatic protector is grounded.

3. The anti-static circuit of claim 1, further comprising a first capacitor and a second capacitor, wherein one end of the first capacitor is electrically connected to the input lead, the other end of the first capacitor is grounded, one end of the second capacitor is electrically connected to the output lead, and the other end of the second capacitor is grounded.

4. The anti-static circuit of claim 2, further comprising a third capacitor electrically connected to the power conductor.

5. The anti-static circuit of claim 1, further comprising a first resistor disposed on the input lead between a connection point of the first electrostatic protector and the input lead and the touch chip module, and a second resistor disposed on the output lead between a connection point of the second electrostatic protector and the output lead and the touch chip module.

6. The antistatic circuit of claim 2 further comprising a third resistor, said third resistor being disposed on said power conductor.

7. The antistatic circuit of claim 1 wherein the main control module comprises a processor and a connector, the connector electrically connects the touch chip module and the processor, and the processor is configured to detect a key state of the touch chip module.

8. The anti-static circuit of claim 5, further comprising a first inductor and a second inductor, wherein the first inductor is disposed on the input wire, the first inductor is disposed between the first resistor and the main control module, the second inductor is disposed on the output wire, and the second inductor is disposed between the second resistor and the main control module.

9. The antistatic circuit of claim 1, wherein the touch chip module comprises a pad and a touch chip, the pad is electrically connected with the touch chip, and the touch chip is used for detecting an inductive capacitance between the pad and the ground and sending a signal to the main control module.

10. An electronic device characterized by comprising the antistatic circuit according to any one of claims 1 to 9.

Technical Field

The invention belongs to the field of electronic equipment, and particularly relates to an antistatic circuit of a touch key and electronic equipment with the antistatic circuit.

Background

Touch key products in the market are more and more widely applied, and traditional mechanical keys in electronic equipment such as a projector are gradually replaced by touch keys. However, when the touch panel is used, static electricity is easily generated in the touch keys of the touch chip module, and if the static electricity reaches the main control module through the conducting wire, the main control module is damaged, so that touch control is disabled. Therefore, antistatic measures are required to prevent static electricity from being generated.

The current antistatic means is mainly to add an electrostatic protection diode on a wire harness to discharge electrostatic energy, but the electrostatic protection diode cannot discharge all the energy, and partial energy still remains in a circuit to damage a main control module and a touch chip module.

Disclosure of Invention

The invention aims to provide an antistatic circuit which can discharge all energy of static electricity and avoid the damage of residual static electricity to components in the circuit.

In order to realize the purpose of the invention, the invention provides the following technical scheme:

in a first aspect, the invention provides an antistatic circuit of a touch key, the antistatic circuit comprises a main control module, a touch chip module, a first electrostatic protector, a second electrostatic protector, an input lead and an output lead, the touch chip module receives an electric signal of the main control module through the input lead, the touch chip module sends a signal to the main control module through the output lead, one end of the first electrostatic protector is electrically connected to the input lead, the other end of the first electrostatic protector is grounded, one end of the second electrostatic protector is electrically connected to the output lead, and the other end of the second electrostatic protector is grounded.

In one embodiment, the antistatic circuit further comprises a third electrostatic protector and a power supply wire, the main control module is connected with a power supply through the power supply wire, one end of the third electrostatic protector is electrically connected with the power supply wire, and the other end of the third electrostatic protector is grounded.

In one embodiment, the anti-static circuit further includes a first capacitor and a second capacitor, one end of the first capacitor is electrically connected to the input lead, the other end of the first capacitor is grounded, one end of the second capacitor is electrically connected to the output lead, and the other end of the second capacitor is grounded.

In one embodiment, the anti-static circuit further includes a third capacitor electrically connected to the power supply lead.

In one embodiment, the anti-static circuit further includes a first resistor and a second resistor, the first resistor is disposed on the input wire, the first resistor is located between the connection point of the first electrostatic protector and the input wire and the touch chip module, the second resistor is disposed on the output wire, and the second resistor is located between the connection point of the second electrostatic protector and the output wire and the touch chip module.

In one embodiment, the anti-static circuit further includes a third resistor, and the third resistor is disposed on the power supply wire.

In one embodiment, the main control module includes a processor and a connector, the connector electrically connects the touch chip module and the processor, and the processor is configured to detect a key state of the touch chip module.

In one embodiment, the anti-static circuit further includes a first inductor and a second inductor, the first inductor is disposed on the input wire, the first inductor is located between the first resistor and the main control module, the second inductor is disposed on the output wire, and the second inductor is located between the second resistor and the main control module.

In one embodiment, the touch chip module includes a pad and a touch chip, the pad is electrically connected to the touch chip, and the touch chip is configured to detect an inductive capacitance between the pad and the ground and send a signal to the main control module.

In a second aspect, the present invention also provides an electronic device, which includes the antistatic circuit described in any one of the embodiments of the first aspect.

Through setting up first electrostatic protection ware and second electrostatic protection ware, first electrostatic protection ware one end electricity is connected in the input wire, and the other end ground connection to with the input of touch chip module through first electrostatic protection ware ground connection, the same, the output passes through second electrostatic protection ware ground connection, makes the produced static of touch chip circuit can excrete to ground through first electrostatic protection ware and second electrostatic protection ware.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a circuit diagram of an anti-static circuit in one embodiment;

fig. 2 is a circuit diagram of an antistatic circuit in another embodiment.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

The invention provides an antistatic circuit of a touch key, which can be applied to electronic equipment with the touch key, such as a mobile phone, a projector, a tablet personal computer, a personal digital assistant and the like. Referring to fig. 1, the anti-static circuit includes a main control module IC1, a touch chip module IC2, a first electrostatic protector D1, a second electrostatic protector D2, an input lead b1 and an output lead b2, the touch chip module IC2 receives an electrical signal of the main control module IC1 through the input lead b1, the touch chip module IC2 sends a signal to the main control module IC1 through the output lead b2, one end of the first electrostatic protector D1 is electrically connected to the input lead b1, the other end of the first electrostatic protector D1 is grounded, one end of the second electrostatic protector D2 is electrically connected to the output lead b2, and the other end of the second electrostatic protector D2 is grounded.

Specifically, the first and second electrostatic protectors D1 and D2 may be Transient suppression diodes, i.e., TVS transistors (Transient Voltage super), or electrostatic protection diodes, i.e., ESD transistors (Electro-static discharge). The first electrostatic protector D1 may be provided in plural, and the plural first electrostatic protectors D1 are connected in parallel, and similarly, the plural second electrostatic protectors D2 may be provided in parallel. The first electrostatic protector D1 may be electrically connected to the input lead b1 and grounded through a lead, and the same applies to the second electrostatic protector D2. It can be understood that the first electrostatic protector D1 is equivalent to be connected in parallel with the input end of the touch chip module IC2, the second electrostatic protector D2 is equivalent to be connected in parallel with the output end of the touch chip module IC2, when the antistatic circuit normally works, both the first electrostatic protector D1 and the second electrostatic protector D2 are in a high-resistance state, which can be understood as an open circuit state, when the touch chip module IC2 in the antistatic circuit generates static electricity, the first electrostatic protector D1 and the second electrostatic protector D2 will be in an ultra-low resistance state, which is equivalent to short-circuiting the main control module IC1, and the static electricity is discharged to the ground from the first electrostatic protector D1 and the second electrostatic protector D2, so that the static electricity cannot reach the main control module IC 1.

Through setting up first electrostatic protection ware D1 and second electrostatic protection ware D2, first electrostatic protection ware D1 one end is connected electrically in input wire b1, and the other end ground connection to with touch chip module IC 2's input through first electrostatic protection ware D1 ground connection, likewise, the output passes through second electrostatic protection ware D2 ground connection, make the produced static of touch chip circuit can discharge completely through first electrostatic protection ware D1 and second electrostatic protection ware D2.

In one embodiment, referring to fig. 1, the main control module IC1 includes a processor (not shown) and a connector (not shown), the connector electrically connects the touch chip module IC2 and the processor, and the processor is used for detecting the key status of the touch chip module IC 2. Specifically, the processor may be a processor on the electronic device, or may be a separate processor. The connector is mainly used for protecting the processor, and the number of the connectors can be multiple. Input lead b1 and output lead b2 are both connected to a connector, which is grounded. It is understood that the connector is provided between the processor and the touch chip module IC2, and when static electricity is generated in the touch chip module IC2, the static electricity reaches the connector first, causing damage to the connector. By providing a processor and a connector that connects the touch chip module IC2 and the processor, it is convenient to protect the processor.

In one embodiment, referring to fig. 1, the touch chip module IC2 includes a pad (not shown) and a touch chip (not shown), the pad is electrically connected to the touch chip, and the touch chip is used for detecting an inductive capacitance between the pad and the ground and sending a signal to the main control module IC 1. Specifically, the bonding pad may be made of tin, copper, aluminum, or the like. The model of the touch chip is preferably IQS 211A. It is understood that, an induced capacitance exists between any two conductive objects, and the pad and the ground can also form an induced capacitance, and the value of the induced capacitance is a fixed and unchangeable tiny value under the condition that the surrounding environment is unchanged. When a human finger is close to the touch key, the total induction capacitance value is increased by the induction capacitance formed by the induction capacitance parallel connection pad formed by the human finger and the ground and the induction capacitance formed by the ground. The touch chip outputs a determination signal that a certain key is pressed after detecting that the value of the induction capacitor of the certain key is changed.

In one embodiment, referring to fig. 1, the anti-static circuit further includes a third electrostatic protector D3 and a power supply wire b3, the main control module IC1 is connected to the power VCC through the power supply wire b3, one end of the third electrostatic protector D3 is electrically connected to the power supply wire b3, and the other end of the third electrostatic protector D3 is grounded. Specifically, the power supply wire b3 is electrically connected to the connector of the main control module IC1, so that the power supply VCC supplies power to the connector, and the power supply VCC is 3.3V dc. It can be understood that the touch chip in the touch chip module IC2 also needs to be powered, and therefore needs to be connected to the power source VCC, and when the touch chip and the connector are powered by the same power source VCC, when static electricity is generated in the touch chip module IC2, the static electricity may reach the power source VCC first and then reach the main control module IC1 along the power supply lead b3, thereby damaging the main control module IC 1. By providing the third electrostatic protector D3, the third electrostatic protector D3 is electrically connected to the power supply lead b3 and grounded, so that static electricity generated by the touch chip module IC2 can be further discharged to the ground, which is favorable for discharging all energy of the static electricity.

In one embodiment, referring to fig. 1, the anti-static circuit further includes a first capacitor C1 and a second capacitor C2, one end of the first capacitor C1 is electrically connected to the input lead b1, the other end of the first capacitor C1 is grounded, one end of the second capacitor C2 is electrically connected to the output lead b2, and the other end of the second capacitor C2 is grounded. Specifically, the capacitance of the first capacitor C1 and the capacitance of the second capacitor C2 are both 1nf, and the breakdown voltage is both 50V. It is understood that, like the first and second electrostatic protectors D1 and D2, the first capacitor C1 is equivalent to being connected in parallel with the input terminal of the touch chip module IC2, and the second capacitor C2 is equivalent to being connected in parallel with the output terminal of the touch chip module IC 2. When the touch chip module IC2 generates static electricity, the static electricity causes high frequency radiation, which is diffused to harm a human body. By providing the first capacitor C1 and the second capacitor C2, the first capacitor C1 and the second capacitor C2 can filter high frequency radiation when high frequency radiation is generated, thereby preventing the high frequency radiation from radiating outward.

In one embodiment, referring to fig. 1, the anti-static circuit further includes a third capacitor C3, and the third capacitor C3 is electrically connected to the power supply wire b 3. Specifically, the third capacitor C3 preferably has a capacitance of 1nf and a breakdown voltage of 50V. Similarly, when the dc power VCC for supplying power to the touch chip module IC2 and the main control module IC1 is the same power VCC, the high frequency radiation generated by static electricity may reach the main control module IC1 from the power supply wire b3 through the power VCC, and the high frequency radiation is further completely filtered by providing the third capacitor C3.

In one embodiment, referring to fig. 1, the anti-static circuit further includes a first resistor R1 and a second resistor R2, the first resistor R1 is disposed on the input wire b1, the first resistor R1 is disposed between a connection point of the first electrostatic protector D1 and the input wire b1 and the touch chip module IC2, the second resistor R2 is disposed on the output wire b2, and the second resistor R2 is disposed between a connection point of the second electrostatic protector D2 and the output wire b2 and the touch chip module IC 2. Specifically, it is preferable that the first resistor R1 and the second resistor R2 each have a resistance of 51 Ω, the first resistor R1 is connected in series to the input lead b1, and the second resistor R2 is connected in series to the output lead b 2. It can be understood that the first resistor R1 and the second resistor R2 are equivalent to being connected in series with the main control module IC1, and even though the high voltage pulse signal is generated by static electricity, the first resistor R1 and the second resistor R2 can consume most of the high voltage pulse signal, thereby reducing the damage of the high voltage pulse signal to the main control module IC 1.

In one embodiment, referring to fig. 1, the anti-static circuit further includes a third resistor R3, and the third resistor R3 is disposed on the power supply wire b 3. Specifically, the resistance of the third resistor R3 is preferably 51 Ω. It is understood that the third resistor R3 is connected in series with the power supply wire b3, which is equivalent to being connected in series with the main control module IC 1. Even if the high-voltage pulse signal generated by static electricity reaches the power supply lead b3 from the power supply VCC, the third resistor R3 can weaken the high-voltage pulse signal, thereby further reducing the damage of the high-voltage pulse signal to the main control module IC 1.

In one embodiment, referring to fig. 2, the anti-static circuit further includes a first inductor L1 and a second inductor L2, the first inductor L1 is disposed on the input lead b1, the first inductor L1 is disposed between the first resistor R1 and the main control module IC1, the second inductor L2 is disposed on the output lead b2, and the second inductor L2 is disposed between the second resistor R2 and the main control module IC 1. It is understood that the first inductor L1 and the second inductor L2 correspond to the first capacitor C1 and the second capacitor C2 for filtering high frequency radiation. In particular, a third inductor L3 may also be provided in the supply conductor b3 to further filter the full high frequency radiation.

The invention also provides electronic equipment which comprises the antistatic circuit. Specifically, the electronic device may be a product with touch keys, such as a mobile phone, a tablet computer, a projector, and a personal digital assistant. By adding the antistatic circuit provided by the invention into the electronic equipment, the electronic equipment has a relatively stable touch function and a relatively low failure rate, and is beneficial to long-term use of the electronic equipment.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.