CN117762057A - Novel plug detection circuit and electronic equipment - Google Patents
Novel plug detection circuit and electronic equipment Download PDFInfo
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Abstract
The invention relates to a novel plug detection circuit and electronic equipment, wherein, the signal detection unit of the embodiment of the invention directly sends a level signal to a control system when detecting that external equipment is accessed, the control system can judge whether the external equipment is accessed according to the signal, if so, the signal transmission unit sends an analog signal to the external equipment, the embodiment does not need to change the structure of a plug output interface, the plug detection can be realized by adding the signal detection unit at the periphery of the plug output interface, the reliable and stable plug detection can be realized by utilizing the detection mode, the reliable and stable detection can be realized with minimum cost under the condition of not modifying the interface in the existing two-wire transmission mechanism, and the intelligence of the existing traditional interface is increased by connecting the control system, and meanwhile, the reliability of the circuit is ensured by an ESD protection unit.
Description
Technical Field
The invention relates to the technical field of insertion detection, in particular to a novel insertion and extraction detection circuit and electronic equipment.
Background
With the development of technology, audio and video devices are commonly used electronic products, such as televisions, mobile phones, audio equipment, cameras, etc. When the electronic products are connected to external devices, the transmission mode of audio and video data needs to be changed, so that whether the external devices are connected to the electronic products needs to be detected in real time.
In the prior art, the following four plug detection methods are commonly used:
1. the mechanical sensor detects, the mode is simple and reliable, the cost is lower, but the sensor is easy to be interfered by the outside, and a larger space is needed for installing the sensor;
2. the electronic sensor detects, the mode has high accuracy and sensitivity to the detection of the insertion action, but has higher cost, higher requirement on environmental conditions and easy electromagnetic interference;
3. touch detection, which is very sensitive to the detection of the insertion action and does not need an additional mechanical sensor, has higher contact requirements on a plug and a socket and is easily affected by pollution and abrasion;
4. the voltage detection is simple and easy to realize, has lower cost, has higher requirements on electrical contact of the plug and the socket, is easily influenced by poor contact or corrosion, and cannot be used if the accessed equipment is passive equipment.
Therefore, the existing plug detection mode is unstable in signal and easy to receive interference, and intelligent detection cannot be realized without changing the interface structure of the traditional two-wire plug interface.
Disclosure of Invention
The embodiment of the invention provides a novel plug detection circuit and electronic equipment, which at least solve the problems that signals in the existing plug detection mode in the related technology are unstable and are easy to receive interference.
In a first aspect, an embodiment of the present invention provides a novel plug detection circuit and an electronic device, where the novel plug detection circuit includes a signal detection unit, a signal transmission unit, an ESD protection unit, and a plug output interface; the input end of the signal detection unit, the output end of the signal transmission unit and the ESD protection unit are coupled to the pluggable output interface;
when the plug output interface is connected with external equipment, the signal detection unit outputs a first level signal and sends the first level signal to a control system; the control system sends an analog signal to the external equipment through the signal transmission unit after receiving the first level signal;
when the external equipment is not connected to the plug output interface, the signal detection unit outputs a second level signal and sends the second level signal to the control system; the control system stops outputting the analog signal after receiving the second level signal;
the ESD protection unit is used for guiding voltage and current generated by electrostatic discharge to a safety threshold.
In an embodiment, the signal detection unit includes an output pull-up resistor and a triode, wherein a first end of the output pull-up resistor is connected with a power supply, and a second end of the output pull-up resistor is connected with a base electrode of the triode and the plug output interface; the collector electrode of the triode is connected with a power supply and the emitter electrode is grounded;
when the plug output interface is connected with external equipment, the power supply is divided by the output pull-up resistor and the internal resistance of the external equipment, so that the triode is cut off, and a first level signal output by a collector electrode of the triode is in a high level;
when the external equipment is not connected to the plug output interface, the base level of the triode is pulled up by the output pull-up resistor, the triode is conducted, and a second level signal output by the collector of the triode is low level.
In one embodiment, the signal detection unit further includes a first resistor, and the first resistor is connected between the collector of the triode and the power supply; the first resistor and the triode form an inverter and are used for conducting jitter filtering on the received detection signals.
In an embodiment, the signal detection unit further includes a second resistor and a third resistor; the first end of the second resistor is grounded, the second end of the second resistor is connected with the base electrode of the triode, and the third resistor is connected between the base electrode of the triode and the plug output interface; the second resistor and the third resistor are used for adjusting and connecting partial voltage.
In an embodiment, the ESD protection unit includes a protection diode, a first end of the connection of the protection diode is connected to the pluggable output interface, and a second end of the connection of the protection diode is grounded; the protection diode and the third resistor form a bidirectional electrostatic discharge protection circuit.
In one embodiment, the signal transmitting unit includes an isolation capacitor, a fourth resistor and a fifth resistor; the isolation capacitor and the fourth resistor are connected in series between the control system and the pluggable output interface, and the fifth resistor is connected between the control system and the grounding end.
In an embodiment, the pluggable output interface is a two-wire pluggable output interface.
In a second aspect, an embodiment of the present invention provides an electronic device, including a control system and a novel plug detection circuit as described in any one of the embodiments above.
The novel plug detection circuit provided by the embodiment of the invention has at least the following technical effects:
when the signal detection unit detects that the external equipment is accessed, a level signal is directly sent to the control system, the control system can judge whether the external equipment is accessed or not according to the signal, if yes, the analog signal is sent to the external equipment through the signal transmission unit, the structure of the plug output interface is not required to be changed, the plug detection can be realized by adding the signal detection unit on the periphery of the plug output interface, the reliable and stable plug detection can be realized by utilizing the detection mode, the reliable and stable detection can be realized with minimum cost under the condition of not modifying the interface in the existing two-wire transmission mechanism, and the intelligence of the existing traditional interface is improved by connecting the control system, and meanwhile, the reliability of a circuit is ensured by the ESD protection unit.
The details of one or more embodiments of the invention are set forth in the accompanying drawings and the description below to provide a more thorough understanding of the other features, objects, and advantages of the invention.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:
fig. 1 is a block diagram of a novel plug detection circuit according to an embodiment of the present invention.
Fig. 2 is a schematic circuit diagram of a novel plug detection circuit according to an embodiment of the present invention.
Fig. 3 is an analog signal transmission schematic diagram of the novel plug detection circuit according to an embodiment of the invention.
Detailed Description
The present invention will be described and illustrated with reference to the accompanying drawings and examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. All other embodiments, which can be made by a person of ordinary skill in the art based on the embodiments provided by the present invention without making any inventive effort, are intended to fall within the scope of the present invention.
It is apparent that the drawings in the following description are only some examples or embodiments of the present invention, and it is possible for those of ordinary skill in the art to apply the present invention to other similar situations according to these drawings without inventive effort. Moreover, it should be appreciated that while such a development effort might be complex and lengthy, it would nevertheless be a routine undertaking of design, fabrication, or manufacture for those of ordinary skill having the benefit of this disclosure, and thus should not be construed as having the benefit of this disclosure.
Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the invention. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is to be expressly and implicitly understood by those of ordinary skill in the art that the described embodiments of the invention can be combined with other embodiments without conflict.
Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The terms "a," "an," "the," and similar referents in the context of the invention are not to be construed as limiting the quantity, but rather as singular or plural. The terms "comprising," "including," "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, article, or apparatus that comprises a list of steps or modules (elements) is not limited to only those steps or elements but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. The terms "connected," "coupled," and the like in connection with the present invention are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The term "plurality" as used herein means two or more. "and/or" describes an association relationship of an association object, meaning that there may be three relationships, e.g., "a and/or B" may mean: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship. The terms "first," "second," "third," and the like, as used herein, are merely distinguishing between similar objects and not representing a particular ordering of objects.
In the prior art, different insertion detection modes have respective advantages and disadvantages, so that when a proper insertion detection mode is selected, factors such as cost, precision, reliability, environmental requirements and the like need to be considered, and appropriate anti-interference measures need to be carefully selected and weighed according to specific application scenes so as to ensure the accuracy and stability of insertion detection. In order to ensure the accuracy and stability of the access detection, the embodiment of the invention provides a novel plug detection circuit and electronic equipment comprising the same.
Referring to fig. 1, a novel plug detection circuit according to an embodiment of the present invention includes a signal detection unit, a signal transmission unit, an ESD protection unit, and a plug output interface. The input end of the signal detection unit, the output end of the signal transmission unit and the ESD protection unit are coupled to the plug output interface, and the plug output interface is a two-wire plug output interface.
When the plug output interface is connected with external equipment, the signal detection unit outputs a first level signal and sends the first level signal to the control system, and the control system sends an analog signal to the external equipment through the signal transmission unit after receiving the first level signal; when the external equipment is not connected to the plug output interface, the signal detection unit outputs a second level signal and sends the second level signal to the control system; the control system stops outputting the analog signal after receiving the second level signal; the ESD protection unit is used for guiding voltage and current generated by electrostatic discharge to a safety threshold.
The ESD protection unit is used to prevent an electrostatic discharge (ESD) from damaging an electronic device or element. The invention provides protection against ESD events by placing ESD protection cells at the pluggable output interface. ESD protection is the introduction of voltage and current to a safe level (i.e., a safe threshold set by a user) when an ESD event occurs to avoid damage to the device and also to improve the reliability and stability of the plug-in detection circuit.
When the signal detection unit detects that the external equipment is accessed, a level signal is directly sent to the control system, the control system can judge whether the external equipment is accessed or not according to the signal, if yes, the analog signal is sent to the external equipment through the signal transmission unit, the structure of the plug output interface is not required to be changed, the plug detection can be realized by adding the signal detection unit on the periphery of the plug output interface, the reliable and stable plug detection can be realized by utilizing the detection mode, the reliable and stable detection can be realized with minimum cost under the condition of not modifying the interface in the existing two-wire transmission mechanism, and the intelligence of the existing traditional interface is improved by connecting the control system, and meanwhile, the reliability of a circuit is ensured by the ESD protection unit.
The invention can solve the problems of few signal pins of the analog signal insertion detection interface and the need of insertion detection, such as insertion detection of other two-wire interfaces of RCA, SMA, BNC, etc., and can enable the system to automatically stop signal output when no access equipment is available and automatically output when equipment is available, thereby reducing the power consumption of the system and improving the intelligence of the system.
The invention utilizes the characteristics of AC and DC, and utilizes the internal resistance of the output equipment, the pull-up of the output equipment, the matching and the inverter to output a detection signal to a CPU, tells the system that the equipment is inserted, the system can intelligently output the signal and stop outputting, saves energy and realizes intelligent low power consumption.
In an embodiment of the present invention, the signal detection unit a includes an output pull-up resistor and a triode, referring specifically to fig. 2. The first end of the output pull-up resistor R11636 is connected with a power supply 3.3V, and the second end of the output pull-up resistor R11636 is connected with the base electrode of the triode Q15 and the plug output interface J8; the collector of the triode Q15 is connected with a power supply 3.3V and the emitter is grounded; when the plug output interface J8 is connected to the external device C, the output pull-up resistor R11636 and the internal resistor R37 of the external device C divide the voltage of the power supply 3.3V, so that the triode Q15 is turned off, and the first level signal rca_det_1 output by the collector of the triode Q16 is at a high level; when the plug output interface J8 is not connected to an external device cable, the base level of the triode Q15 is pulled up by the output pull-up resistor R1163, the triode Q15 is turned on, and the second level signal rca_det_2 output by the collector of the triode Q15 is at a low level.
In this embodiment, referring to fig. 2, the signal transmitting unit B includes an isolation capacitor C4897, a fourth resistor R11633, and a fifth resistor R11634; the isolation capacitor C4897 and the fourth resistor R11633 are connected in series between the control system and the plug output interface J8, and the fifth resistor R11634 is connected between the control system and the ground terminal.
More specifically, when no external device is connected, the base level of Q15 is pulled high by R11636, Q15 turns on rca_det to 0 level, and the control system does not output the analog signal ac_out2; the analog signal path is AC_OUT, a coupling capacitor C4897, a protection resistor R11633 and a plug-in output interface J8 (BNC interface). When the peripheral C is plugged into J8 through the interface J1, the input internal resistance R37 of the device is connected to J8 through the connection cable, and then a voltage is divided with R11636, and the base level of Q15 is at a low level (IN a preferred embodiment, a level smaller than 0.7 can be ensured by adjusting the value of R11636 or R37, so that the control system can control the output analog signal ac_out2, and the analog signal reaches the peripheral output port ac_in through the isolation capacitor C4897, the protection resistors R11633, J8, cable, J1 and C64.
In this embodiment, since the detection paths are all dc components and the analog signal paths are all ac components in the whole process, the detection signals and the analog signals do not affect each other. The invention realizes direct current impedance transmission by utilizing the characteristic that alternating current and direct current are overlapped and do not influence each other, and referring to fig. 3, R11636 or R37 in the figure is a divider resistor, detection shows that detection signals (a first level signal and a second level signal) output by a signal detection unit are sent to a processor in a control system, and a signal output part of the processor outputs analog signals to a signal transmission unit. The first waveform diagram from the left in fig. 3 is the waveform of an analog signal ac_out2, the analog signal reaches the plug output interface through the signal transmission unit, the direct current detection signal is superposed on the output interface, the waveform is shown in the second waveform diagram from the left in fig. 3, after the waveform is filtered by the capacitor C64, the waveform of the signal output by the external device is shown in the third waveform diagram from the left in fig. 3, the waveform of the signal is consistent with the waveform of the analog signal ac_out2, the characteristic that the alternating current and the direct current are superposed and do not affect each other is realized, the direct current impedance transmission is realized, and the analog signal is ensured not to be affected by the signal detection circuit in the transmission process.
Referring to fig. 3, the signal detection unit a further includes a first resistor R11638, and the first resistor R11638 is connected between the collector of the transistor Q15 and the power supply 3.3V. The first resistor R11638 and the triode Q15 form an inverter to realize inverted output, and the inverter is used for performing jitter filtering on a received detection signal to play a role in signal buffering.
Referring to fig. 2, the signal detection unit a further includes a second resistor R21 and a third resistor R11637; the first end of the second resistor R21 is grounded, the second end of the second resistor R21 is connected with the base electrode of the triode Q15, and the third resistor R11637 is connected between the base electrode of the triode Q15 and the plug output interface J8; the second resistor R11638 and the third resistor R11637 are used for adjusting the voltage division.
Referring to fig. 2, the ESD protection unit includes a protection diode D5064, and a first end connected to the protection diode D5064 is connected to the plug output interface J8, and a second end is grounded. The protection diode D5064 and the third resistor R11637 form a bidirectional esd protection circuit.
In another embodiment of the present invention, common ESD protection circuit designs include the following:
1. protective diode (TVS): TVS diodes are special diodes with high voltage tolerance and fast response time. When the voltage exceeds its specific threshold, the TVS diode will conduct rapidly and direct the voltage to ground, thereby protecting the device;
an esd protection chip: these chips integrate various ESD protection mechanisms such as TVS diodes, current limiters, and ESD suppression circuits. They are commonly used to protect input/output ports and other sensitive circuitry;
RC network: the RC network is composed of a resistor and a capacitor, and can be used to add additional ESD protection on the input/output ports. They can slow down the ESD discharge, reducing its potential damage to the device;
4. metal Oxide Semiconductor Field Effect Transistor (MOSFET): MOSFETs may be used as switches for ESD protection circuits. When an ESD event occurs, the MOSFET may be turned on quickly, directing current from the sensitive circuit to ground, thereby protecting the device.
The choice and design of ESD protection circuitry depends on the particular application and device requirements. They play an important role in the design of electronic devices to ensure the reliability and long life of the devices.
The invention mainly uses R37, J1, cable, J8 and R11636 as the signals to be transmitted by the whole channel are AC analog signals, the invention can not affect each other by utilizing AC-DC superposition, and the input equipment has certain internal resistance for preventing the influence on the signal source and protecting the back-end circuit, thereby designing the DC impedance insertion detection by utilizing the principle.
In another embodiment, when the pluggable output interface is a multi-line output interface, the pluggable output interface further includes a detection switch. When the plug output interface is connected with external equipment, the detection switch is closed, and in the embodiment, the two-wire interface can be modified into multiple wires, and the detection switch, such as a reed of an earphone jack and a DC base spring sheet, is added.
In another embodiment, the novel plug detection circuit further comprises a photoelectric sensor or a capacitance sensor; the photoelectric sensor or the capacitance sensor is arranged at the plug output interface and used for detecting whether external equipment is connected.
According to the above, the invention utilizes the output pull-up resistor of the signal detection unit to cooperate with the internal resistance of the external equipment for detection, utilizes the inverter to filter jitter, and utilizes the characteristic that the AC-DC superposition is not mutually influenced to realize DC impedance transmission, and realizes plug detection through the interface of two-line signal transmission, thus realizing plug detection on the premise of not changing the plug output interface, and ensuring the stability and reliability of the detection circuit in the application process. In addition, the novel plug detection circuit is composed of electronic devices with low cost, so that not only is the hardware cost saved, but also the structure is simple, and the occupied space of the circuit is small. The invention is mainly applied to the plug detection circuit of the alternating current signal transmission scene of other connection interfaces such as RCA, BNC, three-color AV line and the like.
In an embodiment of the present invention, an electronic device is provided, which is characterized by comprising a control system and the novel plug detection circuit according to any one of the embodiments above. It should be noted that, the electronic device provided in this embodiment is used to implement the foregoing embodiments, and the description is omitted.
As used above, the terms "module," "unit," "sub-unit," and the like may be a combination of software and/or hardware that implements a predetermined function. While the means described in the above embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (8)
1. The novel plug detection circuit is characterized by comprising a signal detection unit, a signal transmission unit, an ESD protection unit and a plug output interface; the input end of the signal detection unit, the output end of the signal transmission unit and the ESD protection unit are coupled to the pluggable output interface;
when the plug output interface is connected with external equipment, the signal detection unit outputs a first level signal and sends the first level signal to a control system; the control system sends an analog signal to the external equipment through the signal transmission unit after receiving the first level signal;
when the external equipment is not connected to the plug output interface, the signal detection unit outputs a second level signal and sends the second level signal to the control system; the control system stops outputting the analog signal after receiving the second level signal; the ESD protection unit is used for guiding voltage and current generated by electrostatic discharge to a safety threshold.
2. The novel plug detection circuit according to claim 1, wherein the signal detection unit comprises an output pull-up resistor and a triode, a first end of the output pull-up resistor is connected with a power supply, and a second end of the output pull-up resistor is connected with a base electrode of the triode and the plug output interface; the collector electrode of the triode is connected with a power supply and the emitter electrode is grounded;
when the plug output interface is connected with external equipment, the internal resistances of the output pull-up resistor and the external equipment divide the power supply to cut off the triode, and a first level signal output by a collector electrode of the triode is in a high level;
when the external equipment is not connected to the plug output interface, the base level of the triode is pulled up by the output pull-up resistor, the triode is conducted, and a second level signal output by the collector of the triode is low level.
3. The novel plug detection circuit of claim 2, wherein the signal detection unit further comprises a first resistor connected between a collector of the triode and a power supply; the first resistor and the triode form an inverter and are used for conducting jitter filtering on the received detection signals.
4. The novel plug detection circuit of claim 2, wherein the signal detection unit further comprises a second resistor and a third resistor; the first end of the second resistor is grounded, the second end of the second resistor is connected with the base electrode of the triode, and the third resistor is connected between the base electrode of the triode and the plug output interface; the second resistor and the third resistor are used for adjusting and connecting partial voltage.
5. The novel plug detection circuit of claim 4, wherein the ESD protection unit comprises a protection diode, a first end of the protection diode connection being connected to the plug output interface, a second end being grounded; the protection diode and the third resistor form a bidirectional electrostatic discharge protection circuit.
6. The novel plug detection circuit of claim 1, wherein the signal transfer unit comprises an isolation capacitor, a fourth resistor and a fifth resistor; the isolation capacitor and the fourth resistor are connected in series between the control system and the pluggable output interface, and the fifth resistor is connected between the control system and the grounding end.
7. The novel plug detection circuit of claim 1, wherein the plug output interface is a two-wire plug output interface.
8. An electronic device comprising a control system and a novel plug detection circuit as claimed in any one of claims 1 to 7.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311561128.0A CN117762057A (en) | 2023-11-21 | 2023-11-21 | Novel plug detection circuit and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311561128.0A CN117762057A (en) | 2023-11-21 | 2023-11-21 | Novel plug detection circuit and electronic equipment |
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| CN117762057A true CN117762057A (en) | 2024-03-26 |
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| CN202311561128.0A Pending CN117762057A (en) | 2023-11-21 | 2023-11-21 | Novel plug detection circuit and electronic equipment |
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