CN214543613U - Anti-static circuit and system - Google Patents
Anti-static circuit and system Download PDFInfo
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- CN214543613U CN214543613U CN202023232691.8U CN202023232691U CN214543613U CN 214543613 U CN214543613 U CN 214543613U CN 202023232691 U CN202023232691 U CN 202023232691U CN 214543613 U CN214543613 U CN 214543613U
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Abstract
The utility model provides a prevent static circuit and system, this prevent static circuit includes: the switch chip comprises a first data input end, a second data input end, a first data output end, a second data output end, a control end and a grounding end; the first data input end is used for connecting a first data end of the USB interface; the second data input end is used for connecting a second data end of the USB interface; the control end is used for connecting a power end of the USB interface, and when the anti-static circuit is not connected with the USB interface, the first data input end and the second data input end are respectively grounded; when the anti-static circuit is connected with the USB interface, the first data input end is connected with the first data output end, and the second data input end is connected with the second data output end. Therefore, when the USB interface is not accessed, the first data input end and the second data input end are respectively grounded; when the USB interface is accessed, the first data input end is connected with the first data output end, and the second data input end is connected with the second data output end.
Description
Technical Field
The utility model relates to a prevent static circuit field, concretely relates to prevent static circuit and system.
Background
With the widespread use of electronic devices, the most widely used connection of many electronic devices is that the contacts of the female seats of the Pogo pins (Pogo pins) are connected with the pins of the male seats of the Pogo pins on other accessory products, such as a wireless earphone and a charging base thereof, and the charging of the earphone is completed by the mutual contact of the male and female seats of the Pogo pins during the charging of the earphone.
The connection through Pogo Pin contacts presents a problem of ESD protection: the ESD static electricity can be discharged to the whole machine through the Pogo Pin contact, and particularly if the Pogo Pin is a USB signal, the ESD static electricity can directly enter the Soc chip on the internal mainboard of the external equipment through the Pogo Pin, so that the problems of abnormal failure of the external equipment and the like are caused.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model aims to solve the technical problem that an antistatic circuit and system are provided, locate the USB interface with the switch chip on, the D +/D-pin of switch chip control USB interface is connected with ground and is connected with first data output end, second data output end and switches between being connected. Therefore, when the USB interface is not connected, the first data input end and the second data input end are respectively grounded; when the USB interface is accessed, the first data input end is switched to be connected with the first data output end, and the second data input end is switched to be connected with the second data output end, so that the effect of data communication is realized.
To achieve the purpose, the utility model adopts the following technical proposal:
the utility model provides a pair of prevent static circuit, this prevent static circuit includes: the switch chip comprises a first data input end, a second data input end, a first data output end, a second data output end, a control end and a grounding end;
the first data input end is used for connecting a first data end of the USB interface;
the second data input end is used for connecting a second data end of the USB interface;
the control end is used for connecting a power end of the USB interface, and when the anti-static circuit is not connected with the USB interface, the first data input end and the second data input end are respectively grounded; when the anti-static circuit is connected with the USB interface, the first data input end is connected with the first data output end, and the second data input end is connected with the second data output end.
Specifically, the anti-static circuit further includes:
the detection circuit comprises a voltage input end and a signal input end;
the voltage input end and the signal input end of the detection circuit are electrically connected with the USB interface, and the output end of the detection circuit is electrically connected with the control end of the switch chip.
Specifically, the detection circuit comprises a diode D1, a diode D2, a resistor R1 and a triode Q1;
the input end of the diode D1 is a voltage input end, the voltage input end is electrically connected with the USB interface, the output end of the diode D1 is connected with the base of the triode Q1 after being connected with the resistor R1 in series, the input end of the diode D2 is a signal input end, the signal input end is electrically connected with the USB interface, the output end of the diode D2 is connected with the resistor R1 in series and then connected with the base of the triode Q1, the emitter of the triode Q1 is grounded, and the collector of the triode Q1 is electrically connected with the switch chip.
Specifically, the anti-static circuit further includes:
and one end of the USB contact is used for being electrically connected with the USB interface, and the other end of the USB contact is respectively and electrically connected with the first data input end and the second data input end of the switch chip.
Specifically, the USB contact is a spring type probe, one end of the spring type probe is used for being electrically connected with the USB interface, and the other end of the spring type probe is respectively electrically connected with the first data input end and the second data input end of the switch chip.
Specifically, the switch chip is an SGM7227, and the D + and D-pins of the switch chip are a first data input terminal and a second data input terminal; HSD 1-and HSD1+ pins of the switch chip are a first data output end and a second data output end which are respectively used for being electrically connected with external equipment; HSD 2-and HSD2+ pins of the switch chip are grounding terminals; the S pin of the switch chip is a control end.
Specifically, a VCC pin of the switch chip is connected with the power supply, the VCC pin is connected with the OE pin after being connected with the capacitor in series, and the OE pin is grounded.
An anti-static system, comprising:
the USB interface, the SOC chip and the anti-static circuit are arranged on the USB interface; one end of the USB interface is electrically connected with the SOC chip through the anti-static circuit, and the other end of the USB interface is used for being electrically connected with external equipment.
Specifically, the USB interface comprises VCC, D +, D-and GED pins;
the VCC pin is electrically connected with the control end of the switch chip, the D + pin is electrically connected with the first data input end of the switch chip, the D-pin is electrically connected with the second data input end of the switch chip, and the GED pin is electrically connected with the grounding end of the switch chip.
Specifically, the antistatic system further comprises:
and one end of the input interface is electrically connected with the first output end and the second output end of the switch chip respectively, and the other end of the input interface is electrically connected with the SOC chip.
The utility model has the advantages that:
the utility model provides a pair of prevent static circuit, locate the switch chip on the USB interface, when the USB interface is connected with external equipment, the detection circuit gathers the voltage signal or the control signal of external equipment input through voltage input end and signal input end, the detection circuit generates the access signal and transmits to the switch chip, after the switch chip receives the access signal, first data input end is connected with first data output end, second data input end switches on with second data output end, realize data transmission; when the USB interface is not connected with external equipment, the first data input end and the second data input end are respectively conducted with the grounding end by the switch chip, so that ESD static electricity generated between the contacts when the USB interface is connected with the external equipment can be led into the grounding end through the switch chip, the ESD static electricity is isolated from entering the external equipment to be connected, the ESD static electricity is prevented from entering the Soc chip on the internal mainboard of the external equipment, the grounding of the USB contact is kept when the USB interface is not connected, and the connection between the USB contact and the transmission interface is switched when the USB interface is connected.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be 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 for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic diagram of an overall circuit provided in an embodiment of the present invention;
fig. 2 is a logic diagram provided in an embodiment of the present invention.
Description of reference numerals:
1: a switch chip; 2: a detection circuit; 3: a USB contact; 4: a transmission interface; 5: and (4) an external device.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
Example one
As shown in fig. 1, the present embodiment provides an anti-static circuit, which includes: the switch chip 1 comprises a first data input end, a second data input end, a first data output end, a second data output end, a control end and a grounding end; the first data input end is used for connecting a first data end of the USB interface; the second data input end is used for connecting a second data end of the USB interface; the control end is used for connecting a power end of the USB interface, and when the anti-static circuit is not connected with the USB interface, the first data input end and the second data input end are respectively grounded; when the anti-static circuit is connected with the USB interface, the first data input end is connected with the first data output end, and the second data input end is connected with the second data output end. Specifically, the anti-static circuit of this embodiment is used for being connected to the USB interface, when the USB interface is connected to the external device 5, the control terminal of the switch chip 1 receives the voltage signal or the control signal, and when the switch chip 1 receives the voltage signal or the control signal, the first data input terminal is connected to the first data output terminal, and the second data input terminal is connected to the second data output terminal, so that the communication connection between the USB interface and the external device 5 is realized; when the USB interface is not connected with the external equipment 5, the switch chip 1 respectively conducts the first data input end and the second input data input end with the grounding end, so when the USB interface is connected with the external equipment 5, ESD static electricity generated between contacts can be guided into the grounding end through the switch chip 1, the ESD static electricity is isolated from entering the external equipment 5 to be connected, the ESD static electricity is prevented from entering an Soc chip on an internal mainboard of the external equipment 5, the grounding of the USB contact 3 is kept when the USB interface is not connected, the effect that the USB contact 3 is connected with the first data output end and the second data output end is switched when the USB interface is connected is achieved, and the static electricity is prevented from being transmitted into the Soc chip.
Specifically, the anti-static circuit further comprises a transmission interface 4, one end of the transmission interface 4 is electrically connected with the first data output end and the second data output end of the switch chip 1 respectively, the other end of the transmission interface 4 is electrically connected with the external equipment, and the effect that the USB interface is conducted with the external equipment is achieved through the transmission interface 4.
Specifically, the anti-static circuit further comprises a detection circuit 2, wherein the detection circuit 2 comprises a voltage input end and a signal input end; the voltage input end and the signal input end of the detection circuit 2 are electrically connected with the USB interface, and the output end of the detection circuit 2 is electrically connected with the control end of the switch chip 1 to input a control signal. Specifically, the voltage input end and the signal input end of the detection circuit 2 are used for collecting the voltage and the control signal of the external device 5, are electrically connected with the external device 5 through the receiving USB interface and receive the voltage and the control signal of the external device 5, generate an access signal after receiving the voltage and the control signal, and send the access signal into the switch chip 1.
Specifically, the detection circuit 2 includes: the circuit comprises a diode D1, a diode D2, a resistor R1 and a triode Q1; the input end of the diode D1 is a voltage input end, the voltage input end is electrically connected with the USB interface, the output end of the diode D1 is connected with the base electrode of the triode Q1 after being connected with the resistor R1 in series, the input end of the diode D2 is a signal input end, the signal input end is electrically connected with the USB interface, the output end of the diode D2 is connected with the resistor R1 in series and then connected with the base electrode of the triode Q1, the emitting electrode of the triode Q1 is grounded, and the collecting electrode of the triode Q1 is electrically connected with the switch chip 1. Specifically, the voltage input end and the signal input end are both electrically connected with a power supply end of the USB interface, and the voltage input end can generate an access signal by using a voltage signal after the USB is connected to the external device 5, so that the switch chip 1 judges that the external device 5 is connected; when the USB interface is connected to the external device 5 through the signal input terminal, the external device 5 inputs a control signal through the signal input terminal, and controls the switch chip 1 through the control signal.
Specifically, the anti-static circuit further comprises a USB contact 3, one end of the USB contact 3 is electrically connected to the USB interface, and the other end of the USB contact 3 is electrically connected to the first data input terminal and the second data input terminal of the switch chip 1, respectively.
Specifically, the USB contact 3 is a spring type probe, one end of the spring type probe is used for being electrically connected with the USB interface, and the other end of the spring type probe is electrically connected with the first data input end and the second data input end of the switch chip 1, respectively. Specifically, the spring-type probe in this embodiment is Pogo Pin, Pogo Pin is the most widely used contact, the contact of the Pogo Pin female socket is connected with the ejector Pin of the Pogo Pin male socket on another accessory product to realize the connection between electronic devices, and the characteristic of Pogo Pin is that the Pogo Pin contact generates ESD static electricity during the connection, and the ESD static electricity can be discharged to the whole device through the Pogo Pin contact, and particularly, if Pogo Pin is a USB signal, the ESD static electricity can be directly transmitted to the internal motherboard Soc chip of the external device 5 through the Pogo Pin, which causes the problems of abnormal failure of the external device 5, and the like, so that one end of the Pogo Pin contact is electrically connected to the first data input terminal and the second data input terminal of the switch chip 1, and the switch chip 1 controls the first data input terminal and the second data input terminal to be electrically connected to the ground and to the first data output terminal, And the conduction switching of the second data output end realizes whether the Pogo Pin contact is conducted with the external equipment 5 or not, controls the ESD static electricity to be transmitted to the Soc chip of the internal mainboard of the player-less equipment, and realizes the effect of preventing the ESD static electricity from interfering the Soc chip.
Specifically, the switch chip 1 is an SGM7227, and the D + and D-pins of the switch chip 1 are a first data input terminal and a second data input terminal, and are used for being electrically connected to a first data terminal and a second data terminal of the USB interface; HSD 1-and HSD1+ pins of switch chip 1 are connected with a first data output terminal and a second data output terminal, and are respectively used for being electrically connected with external equipment 5; HSD 2-and HSD2+ pins of switch chip 1 are grounding terminals for grounding; the S pin of the switch chip 1 is a control end and is used for connecting a power supply end of the USB interface. Specifically, the SGM7227 is a high-speed, low-power consumption, bipolar/double-throw (Dpdt) analog switch, the operating voltage of the SGM7227 is 1.8V to 4.3V, the SGM7227 is specially designed for high-speed USB2.0 signal exchange in mobile phones and consumer applications, such as mobile phones, digital cameras and notebook computers with hubs or controllers, with wired USB I/O, and the SGM7227 has a wide application range, is very suitable for USB circuits, fits the design idea of the present application for double-pole double-throw switching, and can well achieve the technical effects.
Specifically, a VCC pin of the switch chip 1 is connected with a power supply, the VCC pin is connected with an OE pin after being connected with a capacitor in series, and the OE pin is grounded.
Example two
As shown in fig. 2, the anti-static system provided in this embodiment includes a USB interface, an SOC chip, and the anti-static circuit according to the first embodiment; one end of the USB interface is electrically connected to the SOC chip through the anti-static circuit, and the other end of the USB interface is electrically connected to the external device 5. Specifically, the SOC chip is equivalent to the external device 5 in the first embodiment, the USB interface is electrically connected to the SOC chip, and the USB interface is controlled to be connected to the SOC chip through the anti-static circuit, because when the USB interface is not connected to the SOC chip, the anti-static circuit grounds the first data terminal and the second data terminal of the USB interface, when the USB interface is connected to the SOC chip, if static electricity is applied to the corresponding contact, the static electricity is first introduced to the ground by the anti-static circuit, and then the anti-static circuit recognizes and determines that the USB interface is connected to the SOC chip, and then connects the first data input terminal to the first data output terminal and connects the second data input terminal to the second data output terminal, so as to conduct data connection.
Specifically, the USB interface comprises VCC, D +, D-and GED pins; the VCC pin is electrically connected with the control end of the switch chip 1, the D + pin is electrically connected with the first data input end of the switch chip 1, the D-pin is electrically connected with the second data input end of the switch chip 1, and the GED pin is electrically connected with the grounding end of the switch chip 1.
Specifically, the anti-static system further comprises an input interface, wherein one end of the input interface is electrically connected with the first output end and the second output end of the switch chip 1 respectively, and the other end of the input interface is electrically connected with the SOC chip.
The utility model provides a pair of prevent static circuit and system, locate switch chip 1 on the USB interface, when the USB interface is connected with external equipment 5, detection circuitry 2 gathers the voltage signal or the control signal that external equipment 5 input through voltage input end and signal input end, detection circuitry 2 generates the access signal and transmits to switch chip 1, after switch chip 1 received the access signal, switch chip 1 is connected first data input end and first data output end, second data input end and second data output end, realize data transmission; when the USB interface is not connected to the external device 5, the switch chip 1 connects the first data input terminal and the second data input terminal to the ground terminal, so that ESD static electricity generated between the contacts when the USB interface is connected to the external device 5 is conducted to the ground terminal through the switch chip 1, thereby isolating the ESD static electricity from entering the external device 5 to be connected, preventing the ESD static electricity from entering the Soc chip on the internal motherboard of the external device 5, and achieving the effect of keeping the USB contact 3 grounded when the USB interface is not connected, and switching the USB contact 3 to be connected to the transmission interface 4 when the USB interface is connected.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An anti-static circuit, comprising:
the switch chip comprises a first data input end, a second data input end, a first data output end, a second data output end, a control end and a grounding end;
wherein,
the first data input end is used for connecting a first data end of a USB interface;
the second data input end is used for connecting a second data end of the USB interface;
the control end is used for being connected with a power end of the USB interface, and when the anti-static circuit is not connected with the USB interface, the first data input end and the second data input end are respectively grounded; when the anti-static circuit is connected with the USB interface, the first data input end is connected with the first data output end, and the second data input end is connected with the second data output end.
2. An anti-static circuit as defined in claim 1, further comprising:
a detection circuit comprising a voltage input and a signal input;
the voltage input end and the signal input end of the detection circuit are electrically connected with the USB interface, and the output end of the detection circuit is electrically connected with the control end of the switch chip.
3. An anti-static circuit as claimed in claim 2, wherein said detection circuit comprises:
the circuit comprises a diode D1, a diode D2, a resistor R1 and a triode Q1;
wherein, diode D1's input is voltage input end, voltage input end with the USB interface electricity is connected, diode D1's output with insert triode Q1's base after resistance R1 establishes ties, diode D2's input is signal input end, signal input end with the USB interface electricity is connected, diode D2's output with insert after resistance R1 establishes ties triode Q1's base, triode Q1's emitter ground, triode Q1's collecting electrode with the switch chip electricity is connected.
4. An anti-static circuit as defined in claim 1, further comprising:
and one end of the USB contact is used for being electrically connected with the USB interface, and the other end of the USB contact is respectively and electrically connected with the first data input end and the second data input end of the switch chip.
5. The anti-static circuit according to claim 4, wherein the USB contact is a spring type probe, one end of the spring type probe is electrically connected to the USB interface, and the other end of the spring type probe is electrically connected to the first data input terminal and the second data input terminal of the switch chip, respectively.
6. The electrostatic discharge protection circuit of claim 1, wherein the switch chip is SGM7227, and D + and D-pins of the switch chip are a first data input terminal and a second data input terminal; HSD 1-and HSD1+ pins of the switch chip are a first data output end and a second data output end which are respectively used for being electrically connected with external equipment; HSD 2-and HSD2+ pins of the switch chip are grounding ends; and the S pin of the switch chip is a control end.
7. The anti-static circuit of claim 6, wherein a VCC pin of the switch chip is connected to a power supply, the VCC pin is connected to an OE pin after being connected in series with a capacitor, and the OE pin is grounded.
8. An anti-static system, comprising:
a USB interface, an SOC chip, and the anti-static circuit of any of claims 1-7;
one end of the USB interface is electrically connected with the SOC chip through the anti-static circuit, and the other end of the USB interface is used for being electrically connected with external equipment.
9. The anti-static system of claim 8, wherein the USB interface comprises:
VCC, D +, D-, GED pins;
the VCC pin is electrically connected with the control end of the switch chip, the D + pin is electrically connected with the first data input end of the switch chip, the D-pin is electrically connected with the second data input end of the switch chip, and the GED pin is electrically connected with the grounding end of the switch chip.
10. An antistatic system as in claim 8 further comprising:
and one end of the input interface is electrically connected with the first output end and the second output end of the switch chip respectively, and the other end of the input interface is electrically connected with the SOC chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023232691.8U CN214543613U (en) | 2020-12-28 | 2020-12-28 | Anti-static circuit and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023232691.8U CN214543613U (en) | 2020-12-28 | 2020-12-28 | Anti-static circuit and system |
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| Publication Number | Publication Date |
|---|---|
| CN214543613U true CN214543613U (en) | 2021-10-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202023232691.8U Active CN214543613U (en) | 2020-12-28 | 2020-12-28 | Anti-static circuit and system |
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| CN (1) | CN214543613U (en) |
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- 2020-12-28 CN CN202023232691.8U patent/CN214543613U/en active Active
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