CN111200425A - Reset circuit and related electronic equipment - Google Patents
Reset circuit and related electronic equipment Download PDFInfo
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Abstract
The embodiment of the application discloses a reset circuit and related electronic equipment, and is applied to the field of circuits. The embodiment of the application comprises the following steps: when a reset circuit included in the electronic device detects a short-circuit signal through a network interface module included in the electronic device, the reset circuit may switch the first level signal into the second level signal according to the short-circuit signal. The processor restores the electronic equipment to the initial state according to the second level signal. Furthermore, the operator can remotely send a short-circuit signal to the network interface module to realize the reset of the electronic equipment. The electronic equipment reset processing has small operation difficulty and low cost.
Description
Technical Field
The embodiment of the application relates to the field of circuits, in particular to a reset circuit and related electronic equipment.
Background
The electronic equipment is internally integrated with a reset key. When the user forgets the password of the electronic equipment, the electronic equipment can be returned to the factory value through a reset key in the electronic equipment. Thus, the password of the electronic device is reset to the factory initial password. Therefore, the user can reuse the electronic equipment to carry out corresponding services through the factory initial password. For example, a reset button is integrated in the camera, and an operator can perform a reset operation through the reset button integrated in the camera.
Since some of the electronic equipment will be installed in a location that is difficult for the user to reach, such as a camera, the operator sometimes places the camera on the top of a utility pole or in a corner of a roof. Therefore, the electronic device is difficult to reset, for example, a user needs to use a climbing car or other climbing equipment to ascend to reset the electronic device, which results in high cost for resetting the electronic device.
Disclosure of Invention
The embodiment of the application provides a reset circuit and related electronic equipment, and an operator can remotely reset the electronic equipment by sending a short-circuit signal to a network interface module. The electronic equipment reset processing has small operation difficulty and low cost.
A first aspect of the present application provides a reset circuit, comprising: the network interface module comprises a detection trigger module, a reset control module, a first endpoint and a second endpoint, wherein the first endpoint and the second endpoint are used for connecting two different pins in a network interface included in the network interface module; the detection trigger module receives a detection signal and triggers the reset trigger module to output the first current to the second end point; when the first end point and the second end point are short-circuited through the network interface module, the first current flows into the first end point through a short-circuit line; the P pole of the optical coupler is connected with the first end of the first resistor, the N pole of the optical coupler is grounded, the C pole of the optical coupler is connected with the processor, the E pole of the optical coupler is grounded, the second end of the first resistor is connected with the first end point, the first resistor limits the first current, and a second current is led out, the second current flows to the N pole of the optocoupler from the P pole of the optocoupler, the conduction between the C pole and the E pole of the optocoupler is triggered, or the P pole of the optical coupler is connected with the first end point, the N pole of the optical coupler is connected with the first end of the first resistor, the second end of the first resistor is grounded, the first current flows to the N pole of the optocoupler from the P pole of the optocoupler, conduction between the C pole and the E pole of the optocoupler is triggered, and the current led out from the N pole of the optocoupler is led into the ground after passing through the first resistor; the first end of the second resistor is connected with a first power supply, and the second end of the second resistor is connected with the processor; the first power supply outputs a third current, the second resistor limits the third current and derives a fourth current, and before the C pole of the optocoupler is conducted with the E pole, the fourth current is input into the processor, and the processor receives a first level signal; when the pole C and the pole E of the optical coupler are conducted, the fourth current is conducted into the ground through a branch where the pole C and the pole E of the optical coupler are located, the level signal received by the processor is switched into the second level signal from the first level signal, the first level signal is higher than the second level signal, and the second level signal is used for indicating the processor to restore the electronic equipment to the initial state.
In this embodiment, when the reset circuit included in the electronic device detects the short-circuit signal through the network interface module included in the electronic device, the reset circuit may switch the first level signal to the second level signal according to the short-circuit signal. The processor restores the electronic equipment to the initial state according to the second level signal. Furthermore, the operator can remotely send a short-circuit signal to the network interface module to realize the reset of the electronic equipment. The electronic equipment reset processing has small operation difficulty and low cost.
In a possible implementation manner of the first aspect, the circuit: the reset control module further comprises a first capacitor; the first end of the first capacitor is connected with the pole C of the optocoupler, and the second end of the first capacitor is connected with the pole E of the optocoupler; when the C pole and the E pole of the optical coupler are conducted, the fourth current charges the first capacitor, the first capacitor after the charging saturation discharges, and the current generated after the discharging is led into the ground, so that signal jitter generated in the process of switching the first level signal into the second level signal is removed.
In this possible implementation manner, after the C pole and the E pole of the optocoupler are conducted, the fourth current charges the first capacitor, the first capacitor after saturation charging discharges, and the current generated after discharging is led into the ground. The possible implementation mode removes signal jitter generated in the process of switching the first level signal into the second level signal, reduces the probability of false triggering, and improves the accuracy of the circuit.
In a possible implementation manner of the first aspect, the circuit: the reset trigger module at least comprises a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) and a third resistor, and the detection trigger module comprises a triode; the MOS tube has an S pole connected with a second power supply, a D pole connected with the second end point and a G pole connected with the collector of the triode; the first end of the third resistor is connected with the second power supply, and the second end of the third resistor is connected with the G pole of the MOS tube; when the triode works in a saturation region, the second power supply outputs a fifth current, and the fifth current comprises a first branch and a second branch; the third resistor limits the current of the first branch current and derives a sixth current, the sixth current is led into the ground through a collector of the triode, and the voltage shared by the third resistor is reset trigger voltage; the MOS tube is connected with the third resistor in parallel, the voltage of the MOS tube is the reset trigger voltage, the reset trigger voltage triggers the S pole and the D pole of the MOS tube to be conducted, the second branch is input into the S pole of the MOS tube, and the D pole of the MOS tube leads the first current to the second end point.
In the possible implementation mode, a specific implementation mode of the reset triggering module is provided, and the realizability of the scheme is improved.
In a possible implementation manner of the first aspect, the circuit: the reset trigger module further comprises a second capacitor; the first end of the second capacitor is connected with the second power supply, and the second end of the second capacitor is connected with the G pole of the MOS tube; when the collector and the emitter of the triode are switched to a conducting state from an interruption state, the first branch current and the second branch current charge the second capacitor, the second capacitor after the charging saturation discharges, and the current generated after the discharging is led into the ground.
In this possible implementation manner, at the moment when the collector and the emitter of the triode are switched from the interruption state to the conduction state, the first branch current and the second branch current charge the second capacitor, and the second capacitor after the charging saturation is discharged. The second capacitor discharges slowly, and the current flowing into the triode is prevented from increasing suddenly. The current generated after discharging is input into the collector of the triode by the second capacitor and then is led into the ground by the emitter of the triode, and the safety of the circuit is improved by the possible implementation mode.
In a possible implementation manner of the first aspect, the circuit: the reset trigger module at least comprises a relay and a fourth resistor, the relay comprises a coil and a relay switch, and the detection trigger module comprises a triode; the first end of the relay is connected with a second power supply, the second end of the relay is connected with the first end of the fourth resistor, and the third end of the relay is connected with a third power supply; the second end of the fourth resistor is connected with the collector of the triode; the first end of the coil is connected with the first end of the relay, and the second end of the coil is connected with the second end of the relay; the first end of the relay switch is connected with the third end of the relay, and the second end of the relay switch is connected with the second end point; when the collector and the emitter of the triode are in a conducting state, the third power supply outputs a seventh current, the seventh current flows into the coil through the first end of the relay, an eighth current is led out from the second end of the relay, and the eighth current is led into the ground through the collector of the triode after being limited by the fourth resistor; and generating attractive force after the coil is electrified, wherein the attractive force triggers the relay switch to be closed so that the third power supply outputs the first current to the second end point through the third end of the relay and the relay switch.
In the possible implementation mode, a specific implementation mode of the reset triggering module is provided, and the realizability of the scheme is improved.
In a possible implementation manner of the first aspect, the circuit: the relay further comprises a freewheeling diode; the negative electrode of the freewheeling diode is connected with the first end of the coil, and the positive electrode of the freewheeling diode is connected with the second end of the coil; when the collector and the emitter of the triode are switched to be in a closed state from a conducting state, the electric energy in the coil generates reverse electromotive force, the second end of the coil is a positive electrode, the first end of the coil is a negative electrode, the second end of the coil outputs ninth current, the tenth current is led out from the negative electrode of the diode through the positive electrode of the diode, the intensity of the tenth current is lower than that of the ninth current, and the coil continuously outputs the current until the electric energy of the coil is exhausted.
In this possible implementation, the electrical energy in the coil generates a back emf. The second end of the coil is a positive electrode, the first end of the coil is a negative electrode, the second end of the coil outputs a ninth current, and the tenth current is output from the negative electrode of the diode through the positive electrode of the diode. The tenth current is lower in intensity than the ninth current. The coil continuously outputs current until the coil is exhausted. The freewheeling diode can deplete the emf remaining in the coil to prevent the emf remaining in the coil from damaging other devices in the circuit and from falsely triggering a reset operation. This possible implementation improves the safety of the reset circuit.
In a possible implementation manner of the first aspect, the circuit: the base electrode of the triode is connected with the first end of the fifth resistor, and the emitting electrode of the triode is grounded; a second end of the fifth resistor is connected with the processor; the processor outputs a detection current, the fifth resistor limits the detection current, and after the detection current is limited, a second end of the fifth resistor leads out a trigger current to the base electrode of the triode, wherein the trigger current is a level signal received by the base electrode of the triode; when the level signal of the base electrode of the triode is switched from a third level signal to a fourth level signal, the fourth level signal is higher than the third level signal, the triode is switched from a cut-off state to a working state, and the collector electrode and the emitter electrode of the triode are conducted.
In the possible implementation mode, a specific implementation mode for detecting the trigger module is provided, and the realizability of the scheme is improved.
In a possible implementation manner of the first aspect, the circuit: the detection trigger module further comprises a sixth resistor; the first end of the sixth resistor is connected with the processor, and the second end of the sixth resistor is grounded; when the processor does not output a level signal to the base of the triode, the sixth resistor is used for ensuring that the potential of the base of the triode is the same as the ground.
In this possible implementation, when the processor does not output a level signal to the base of the transistor, the sixth resistor is used to ensure that the potential of the base of the transistor is the same as ground. The base electrode and the emitting electrode of the triode are prevented from generating larger potential difference to lead the collector electrode and the emitting electrode of the triode to be conducted, and the false triggering reset operation is caused. This possible implementation improves the accuracy of the reset circuit.
In a possible implementation manner of the first aspect, the circuit: the network interface included in the network interface module is an RJ45 interface, and two different pins in the network interface are respectively a pin numbered 1 in the RJ45 interface and a pin numbered 8 in the RJ45 interface.
In the possible implementation mode, a specific form of a network interface is provided, and the realizability of the scheme is improved.
A second aspect of the present application provides a camera, including: the reset circuit comprises a detection trigger module, a reset control module, a first endpoint and a second endpoint, wherein the first endpoint and the second endpoint are used for connecting two different pins in a network interface included in the network interface module, and the reset circuit is described in the first aspect or any one of the possible implementation manners of the first aspect.
In this embodiment of the application, when the reset circuit included in the camera detects the short-circuit signal through the network interface module included in the camera, the reset circuit may switch the first level signal into the second level signal according to the short-circuit signal. The processor restores the camera to the initial state according to the second level signal. Furthermore, the operator can remotely send a short-circuit signal to the network interface module to reset the camera. The operation difficulty of the camera reset processing is small, and the cost of the camera reset processing is low.
According to the technical scheme, the embodiment of the application has the following advantages:
in this embodiment, when the reset circuit included in the electronic device detects the short-circuit signal through the network interface module included in the electronic device, the reset circuit may switch the first level signal to the second level signal according to the short-circuit signal. The processor restores the electronic equipment to the initial state according to the second level signal. Furthermore, the operator can remotely send a short-circuit signal to the network interface module to realize the reset of the electronic equipment. The electronic equipment reset processing has small operation difficulty and low cost.
Drawings
Fig. 1 is a schematic structural diagram of an electronic device provided in an embodiment of the present application;
fig. 2 is a schematic diagram of an embodiment of a reset circuit provided in an embodiment of the present application;
fig. 3 is a schematic diagram of another embodiment of a reset circuit provided in an embodiment of the present application;
fig. 4 is a schematic diagram of another embodiment of a reset circuit provided in an embodiment of the present application;
fig. 5 is a schematic diagram of another embodiment of a reset circuit provided in an embodiment of the present application;
fig. 6 is a schematic diagram of another embodiment of a reset circuit provided in an embodiment of the present application;
fig. 7 is a schematic diagram of another embodiment of a reset circuit provided in an embodiment of the present application;
fig. 8 is a schematic diagram of another embodiment of a reset circuit provided in an embodiment of the present application;
fig. 9 is a schematic diagram of another embodiment of a reset circuit according to an embodiment of the present disclosure.
Detailed Description
Embodiments of the present application will now be described with reference to the accompanying drawings, and it is to be understood that the described embodiments are merely illustrative of some, but not all, embodiments of the present application. As can be known to those skilled in the art, with the development of technology and the emergence of new scenarios, the technical solution provided in the embodiments of the present application is also applicable to similar technical problems.
The terms "first," "second," and the like in the description and in the claims of the present application and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced otherwise than as specifically illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The electronic equipment is internally integrated with a reset key. When the user forgets the password of the electronic equipment, the electronic equipment can be returned to the factory value through a reset key in the electronic equipment. Thus, the password of the electronic device is reset to the factory initial password. Therefore, the user can reuse the electronic equipment to carry out corresponding services through the factory initial password. For example, a reset button is integrated in the camera, and an operator can perform a reset operation through the reset button integrated in the camera.
Since some of the electronic equipment will be installed in a location that is difficult for the user to reach, such as a camera, the operator sometimes places the camera on the top of a utility pole or in a corner of a roof. Therefore, the electronic device is difficult to reset, for example, a user needs to use a climbing car or other climbing equipment to ascend to reset the electronic device, which results in high cost for resetting the electronic device.
Aiming at the problems existing in the conventional electronic equipment during resetting, the embodiment of the application provides the reset circuit and the related electronic equipment, which can reduce the reset cost of the electronic equipment.
The reset signal (reset signal) is a signal for restoring the electronic device to an initial state. The circuit that generates the reset signal is a reset circuit (reset circuit).
In the operation process of electronic equipment such as a programmable chip, a programmable controller, a microcomputer and the like, the electronic equipment sometimes has the condition of program runaway or program jump. At this point, the equipment maintainer may employ some form of circuitry to send a signal to a hardware specific interface. After the hardware receives the signal through the specific interface, the hardware can restore the electronic device to the initial state, and the process is a reset process. In this process, the equipment maintainer may employ some form of circuitry to send a signal, which is a reset signal, to a hardware specific interface. The circuit that generates this signal is a reset circuit.
It is understood that the reset circuit mentioned in the embodiments of the present application can be applied to any scene where a reset operation needs to be performed, and in particular, can be applied to a video camera.
A video camera (also called a computer camera, a computer eye, an electronic eye, etc.) is a video input device. The camera operates on the principle of converting an optical image signal into an electrical signal, which is then stored or transmitted. The camera is widely applied to video conferences, telemedicine, real-time monitoring and the like.
When a reset circuit included in the camera detects a short-circuit signal through a network interface module included in the camera, the reset circuit can switch the first level signal into the second level signal according to the short-circuit signal. The processor restores the camera to the initial state according to the second level signal. Furthermore, the operator can remotely send a short-circuit signal to the network interface module to reset the camera. The operation difficulty of the camera reset processing is small, and the cost of the camera reset processing is low.
Fig. 1 is a schematic structural diagram of an electronic device provided in an embodiment of the present application.
Referring to fig. 1, as shown in fig. 1, an electronic device 100 provided in the embodiment of the present application includes: a power module 101, a reset module 102, a network interface module 103, and a processor module 104.
The reset module 102 is connected to the power module 101, the network interface module 103 and the processor module 104, and the processor module 104 is connected to the power module 101 and the network interface module 103.
The power supply module supplies power to the electronic device. The power module provides the power required by all components in the electronic device. Whether the current and the voltage provided by the power module are stable or not directly influences the working performance and the service life of the electronic equipment.
The reset module is a module for generating a reset signal, and the reset module comprises a reset circuit. After the reset module generates the reset signal, the reset signal is input to the processor module, and the reset signal can instruct the processor module to restore the electronic device to the initial state.
The network interface module refers to an Ethernet interface. In the embodiment of the application, the electronic device can establish network communication through the network interface module. The network interface module may have a physical structure that includes a receptacle. The network cable is provided with a network cable plug matched with the socket, and when the network cable plug matched with the socket is inserted into the socket included in the network interface module, the electronic equipment can establish network communication through the network interface module. After receiving the short circuit signal, the network interface triggers the reset module to generate a reset signal.
The processor module is an operation and control core of the electronic equipment and is a final execution unit for information processing and program operation. After the processor module receives the reset signal generated by the reset module, the processor module may restore the electronic device to an initial state.
The reset circuit provided in the embodiment of the present application is described based on the schematic structural diagram of the electronic device described in fig. 1.
Fig. 2 is a schematic diagram of an embodiment of a reset circuit according to an embodiment of the present disclosure.
Referring to fig. 2, as shown in fig. 2, the reset circuit in the embodiment of the present application includes: the device comprises a detection triggering module, a reset control module, a first endpoint 1 and a second endpoint 2.
The reset control module at least comprises an optical coupler U1, a first resistor R1 and a second resistor R2.
The first endpoint 1 is used for connecting a first pin in a network interface included in the network interface module, the second endpoint 2 is used for connecting a second pin in the network interface included in the network interface module, and the first pin is different from the second pin.
Optionally, the network interface included in the network interface module in the embodiment of the present application may be an RJ45 interface. The first pin of the network interface included in the network interface module is a pin numbered 1 in the RJ45 interface, and the second pin of the network interface included in the network interface module is a pin numbered 8 in the RJ45 interface.
Optionally, the network interface included in the network interface module in the embodiment of the present application may also be an RJ11 interface, an RJ48 interface, an RJ50 interface, a TERA network interface, or other types of network interfaces, which is not limited herein.
Optionally, the first pin and the second pin may be any two different pins in the network interface, and are not limited herein.
The P pole of the optical coupler is connected with the first end of the first resistor, the N pole of the optical coupler is grounded, the C pole of the optical coupler is connected with the processor, and the E pole of the optical coupler is grounded.
An Optical Coupler (OCEP) is also called a photo isolator or a photo coupler, and is called an optocoupler for short. The optical coupler is a device for transmitting an electrical signal by using light as a medium, and generally encapsulates a light emitter and a light receiver in the same tube shell. The light emitter may be an infrared light emitting diode, and the light receiver may be a photosensitive transistor, a photosensitive switch, and a photosensitive resistor. When the input end is electrified, the light emitter emits light, and the light receiver receives the light, then photocurrent is generated and flows out from the output end, thereby realizing 'electro-optic-electro' conversion. The photoelectric coupler using light as medium to couple the input signal to the output has the advantages of small size, long service life, no contact, strong anti-interference ability, insulation between output and input, unidirectional signal transmission, etc. and is widely used in digital circuit.
The second end of the first resistor is connected to the first terminal 1.
The first end of the second resistor is connected with the first power supply, and the second end of the second resistor is connected with the processor.
In the embodiment of the application, when the detection triggering module receives the detection signal, the reset triggering module is triggered to output the first current to the second end point. The first endpoint 1 is connected with a first pin of a network interface included in the network interface module, and the second endpoint 2 is connected with a second pin of the network interface included in the network interface module. When the first pin and the second pin included in the network interface module are shorted, the first end point 1 and the second end point 2 connected to the first pin and the second pin are also shorted. Thus, after the second terminal 2 outputs the first current, the first current may be input to the first terminal 1 through the short-circuit line between the second terminal 2 and the first terminal 1. Thus, a first current flows from the first terminal 1 through the reset control block included in the reset circuit.
In the embodiment of the present application, after the first current is inputted to the first terminal 1, the first resistor R1 will limit the first current, and the current after the current limiting is defined as the second current. After the second current flows into the P pole of the optocoupler U1, the optocoupler U1 is in an operating state. The second current flows into a light emitting device contained in the optical coupler U1 from the P pole of the optical coupler U1, the light emitting device emits light, and the current flowing out of the light emitting device is conducted to the ground through the N pole of the optical coupler U1.
Optionally, the light emitting device included in the optical coupler U1 mentioned in this embodiment of the present application may be an infrared light emitting diode, and may also be another light emitting device, which is not limited herein.
In the embodiment of the application, after the light emitting device included in the optical coupler U1 emits light, the light receiving device included in the optical coupler U1 will be correspondingly changed. If the light receiving device is a photosensitive switch, after the light emitting device emits light, the photosensitive switch is closed, and the interrupted state between the C pole and the E pole of the optical coupler U1 is switched to the conducting state.
Optionally, in this embodiment, the first resistor may limit the current in another implementation manner. The P utmost point of opto-coupler is connected with first extreme point, and the N utmost point of opto-coupler is connected with the first end of first resistance, and the second end ground connection of first resistance, first electric current are by the utmost point N utmost point flow to the opto-coupler of opto-coupler, trigger to switch on between the C utmost point and the E utmost point of opto-coupler, and the leading-in ground of electric current behind the first resistance of the utmost point derivation of N of opto-coupler. The first resistor can also limit the current flowing in the branch where the first resistor is located, which is not described herein in detail.
In this embodiment, the first power source outputs a third current, the second resistor limits the third current, and the current after limiting is defined as a fourth current. When the voltage between the C pole and the E pole of the optocoupler U1 is in an interruption state, the fourth current is input into the processor, and a level signal received by the processor is a first level signal which is used for indicating that the electronic equipment is in a normal working state. When the pole C and the pole E of the optical coupler U1 are in a closed state, the fourth current is conducted to the ground through a path between the pole C and the pole E of the optical coupler U1. The level signal received by the processor is a second level signal. The first level signal is higher than a second level signal, and the second level signal is used for instructing the processor to restore the electronic equipment to the initial state.
Optionally, the first level signal may be a high level signal, and the second level signal may be a low level signal, which is not limited herein.
In the embodiment of the present application, the reset control module is formed by combining a first resistor R1, an optocoupler U1, and a second resistor R2, and there are other types of equivalent forms, which are not limited herein.
In this embodiment, when the reset circuit included in the electronic device detects the short-circuit signal through the network interface module included in the electronic device, the reset circuit may switch the first level signal to the second level signal according to the short-circuit signal. The processor restores the electronic equipment to the initial state according to the second level signal. Furthermore, the operator can remotely send a short-circuit signal to the network interface module to realize the reset of the electronic equipment. The electronic equipment reset processing has small operation difficulty and low cost.
Fig. 3 is a schematic diagram of another embodiment of a reset circuit according to an embodiment of the present disclosure.
Referring to fig. 3, based on the reset control module shown in fig. 2 described in the foregoing embodiment, the reset control module in this embodiment may further include a first capacitor C1.
A first end of the first capacitor C1 is connected with a C pole of the optocoupler U1, and a second end of the first capacitor C1 is connected with an E pole of the optocoupler U1.
At the moment when the C pole and the E pole of the optocoupler U1 are switched from the off state to the on state, the fourth current charges the first capacitor C1 after passing through the C pole and the E pole of the optocoupler U1. The first capacitor C1 after being saturated is discharged, the discharging process is slow, and the current generated after discharging is conducted to the ground. When the C pole and the E pole of the optocoupler U1 are conducted, the level signal received by the processor is switched from the first level signal to the second level signal. The first capacitor slows down the switching speed of the level signal so as to remove the jitter of the level signal generated in the process of switching the first level signal into the second level signal.
In the embodiment of the present application, the connection manner of the capacitor C1 may also have other equivalent forms, and is not limited herein.
Fig. 4 is a schematic diagram of another embodiment of a reset circuit provided in an embodiment of the present application.
Referring to fig. 4, the reset triggering module at least includes a MOS transistor and a third resistor R3, and the detection triggering module includes a triode.
The MOS tube has an S pole connected to the second power supply, a D pole connected to the second end point, and a G pole connected to the collector of the transistor.
The first end of the third resistor is connected with the second power supply, and the second end of the third resistor is connected with the G pole of the MOS tube.
When the triode works in the cut-off region, the G pole of the MOS tube is disconnected with the ground wire, and a closed loop is not formed in the reset triggering module. No current flows in the reset triggering module, and the reset triggering module is not in a working state.
When the triode works in a saturation region, the G pole of the MOS tube is communicated with the ground wire, the second power supply outputs fifth current, and the fifth current comprises a first branch and a second branch.
The third resistor R3 limits the current of the first branch, and the current after limiting is defined as the sixth current, which is input to the collector of the triode. The triode works in a saturation region, and a collector electrode and an emitter electrode of the triode are in a conducting state. And the sixth current is led into the ground by the emitter of the triode after passing through the collector of the triode. The voltage shared by the third resistor R3 is the reset trigger voltage.
And the S pole and the G pole of the MOS tube are connected with the third resistor in parallel, and the voltage between the S pole and the G pole of the MOS tube is reset trigger voltage. The reset trigger voltage triggers the conduction of the S pole and the D pole of the MOS tube, the second branch is input into the S pole of the MOS tube, and the D pole of the MOS tube leads out a first current to the second end point.
The first endpoint 1 is connected with a first pin of a network interface included in the network interface module, and the second endpoint 2 is connected with a second pin of the network interface included in the network interface module. When the first pin and the second pin included in the network interface module are shorted, the first end point 1 and the second end point 2 connected to the first pin and the second pin are also shorted. A first current may flow from the second terminal 2 into the first terminal 1 and the first current may enter the reset control module.
In the embodiment of the present application, the reset triggering module is formed by combining an MOS transistor and a third resistor, and there are other types of equivalent forms, which are not limited herein.
Fig. 5 is a schematic diagram of another embodiment of a reset circuit according to an embodiment of the present disclosure.
Based on the reset triggering module shown in fig. 4 described in the above embodiment, the reset triggering module in this embodiment may further include a second capacitor C2.
The first end of the second capacitor C2 is connected with the second power supply, and the second end is connected with the G pole of the MOS transistor.
At the moment when the collector and the emitter of the triode are switched to the conducting state from the interruption state, the first branch current and the second branch current charge the second capacitor C2, and the second capacitor C2 after the charging is saturated discharges. The second capacitor C2 discharges more slowly, preventing a sudden increase in current flowing into the triode. The second capacitor C2 inputs the current generated by discharging into the collector of the transistor, and then the current is conducted to the ground through the emitter of the transistor.
In the embodiment of the present application, the connection manner of the capacitor C2 may also have other equivalent forms, and is not limited herein.
Fig. 6 is a schematic diagram of another embodiment of a reset circuit according to an embodiment of the present disclosure.
Referring to fig. 6, the reset triggering module at least includes a relay and a fourth resistor R4, the relay includes a coil and a relay switch, and the detection triggering module includes a triode.
The first end of the relay is connected with the second power supply, the second end of the relay is connected with the first end of the fourth resistor R4, and the third end of the relay is connected with the third power supply.
And the second end of the fourth resistor is connected with the collector of the triode.
The first end of coil is connected with the first end of relay, and the second end is connected with the second end of relay.
The first end of the relay switch is connected with the third end of the relay, and the second end of the relay switch is connected with the second end point.
When the collector and the emitter of the triode are in a conducting state, the second power supply outputs seventh current, and the seventh current flows into the coil through the first end of the relay. After passing through the coil, the seventh current flows from the second end of the coil to the second end of the relay. The second terminal of the relay draws an eighth current. The fourth resistor R4 limits the eighth current, which is then input to the collector of the transistor after being limited by the fourth resistor R4. The current flows into the emitter of the triode from the collector of the triode, and the current is led into the ground through the emitter of the triode.
When the current output by the second power supply is input into the coil, the coil generates attraction force after being electrified. The attraction force switches the trigger relay switch from the position a to the position b, so that the third power supply outputs first current to the second end point through the third end of the relay and the relay switch.
Optionally, the first power supply, the second power supply, and the third power supply mentioned in the above embodiments may be the same power supply, or may be different power supplies, and are not limited herein.
Fig. 7 is a schematic diagram of another embodiment of a reset circuit according to an embodiment of the present disclosure.
Referring to fig. 7, based on the reset triggering module shown in fig. 6 described in the foregoing embodiment, the reset triggering module in this embodiment may further include a freewheeling diode.
The negative pole of the freewheeling diode is connected with the first end of the coil, and the positive pole of the freewheeling diode is connected with the second end of the coil.
When the collector and the emitter of the triode are switched to be in an off state from an on state, the residual electric energy in the coil generates reverse electromotive force, and the reverse electromotive force generated in the coil discharges in a closed loop. When the coil discharges, the second end of the coil is a positive electrode, and the first end of the coil is a negative electrode. The second end of the coil will output the ninth current. The ninth current passes through the anode of the diode, the cathode of the diode leads the tenth current, and the intensity of the tenth current is lower than that of the ninth current. The coil continuously outputs current until the coil is exhausted.
Fig. 8 is a schematic diagram of another embodiment of a reset circuit according to an embodiment of the present disclosure.
Referring to fig. 8, the detection trigger module at least includes a transistor and a fifth resistor R5.
The base electrode of the triode is connected with the first end of the fifth resistor R5, and the emitter electrode of the triode is grounded.
A second terminal of the fifth resistor R5 is coupled to the processor.
And when the processor confirms that the electronic equipment does not reach the reset condition, the processor outputs trigger detection current to the base electrode of the triode. Thus, the triode operates in the cut-off region, and the circuit between the collector and emitter of the triode is in an interrupted state. When the processor confirms that the electronic equipment reaches the reset detection condition, the processor outputs detection current to the base electrode of the triode. Thus, the triode works in a saturation region, and a circuit between a collector and an emitter of the triode is in a conducting state.
Optionally, the reset condition may be whether the electronic device receives a network signal. The network signal is used to indicate that the electronic device has a network connection. After the processor confirms that the electronic equipment does not receive the network signal, the processor confirms that the electronic equipment reaches the reset condition.
Optionally, the reset condition may be a power-on duration after the electronic device is powered on. When the processor confirms that the time length after the electronic equipment is powered on does not exceed the first threshold value, the processor confirms that the electronic equipment reaches the reset condition.
Alternatively, the reset condition may also be other types of conditions, and is not limited herein.
After the processor outputs the trigger detect current, the fifth resistor R5 limits the trigger detect current. After current limiting, the second terminal of the fifth resistor R5 leads a trigger detection branch to the base of the transistor, and the trigger detection branch is the third level signal received by the base of the transistor.
After the processor outputs the detection current, the fifth resistor R5 limits the detection current. After the current limiting, the second terminal of the fifth resistor R5 outputs a trigger current to the base of the transistor, and the trigger current is a fourth level signal received by the base of the transistor.
When the level signal of the base electrode of the triode is switched from the third level signal to the fourth level signal, the fourth level signal is higher than the third level signal, the triode is switched from the cut-off state to the working state, and the collector electrode and the emitter electrode of the triode are conducted.
Fig. 9 is a schematic diagram of another embodiment of a reset circuit according to an embodiment of the present disclosure.
Referring to fig. 9, based on the detection trigger module shown in fig. 8 described in the foregoing embodiment, the detection trigger module in this embodiment may further include a sixth resistor R6.
The first end of the sixth resistor R6 is connected to the processor, and the second end of the sixth resistor R6 is connected to ground.
When the processor does not output a level signal to the base of the transistor, no current flows through the sixth resistor R6. The first end of the sixth resistor R6 is connected with the base of the triode, and the second end is grounded. Thus, the sixth resistor R6 can ensure that the base of the transistor is at the same potential as ground. The sixth resistor R6 prevents a large potential difference between the base and the emitter of the transistor. If a large potential difference occurs, the collector and the emitter of the triode may be conducted, and the reset operation may be triggered by mistake.
In this embodiment, when the reset circuit included in the electronic device detects the short-circuit signal through the network interface module included in the electronic device, the reset circuit may switch the first level signal to the second level signal according to the short-circuit signal. The processor restores the electronic equipment to the initial state according to the second level signal. Furthermore, the operator can remotely send a short-circuit signal to the network interface module to realize the reset of the electronic equipment. The electronic equipment reset processing has small operation difficulty and low cost.
The reset circuit provided in the embodiments of the present application is described in detail above, and the principles and implementations of the present application are described herein using specific examples, and the above description of the embodiments is only used to help understanding the method and the core idea of the present application. Meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
1. A reset circuit, comprising: the network interface module comprises a detection trigger module, a reset control module, a first endpoint and a second endpoint, wherein the first endpoint and the second endpoint are used for connecting two different pins in a network interface included in the network interface module;
the detection trigger module receives a detection signal and triggers the reset trigger module to output the first current to the second end point;
when the first end point and the second end point are short-circuited through the network interface module, the first current flows into the first end point through a short-circuit line;
the P pole of the optical coupler is connected with the first end of the first resistor, the N pole of the optical coupler is grounded, the C pole of the optical coupler is connected with the processor, the E pole of the optical coupler is grounded, the second end of the first resistor is connected with the first end point, the first resistor limits the first current, and a second current is led out, the second current flows to the N pole of the optocoupler from the P pole of the optocoupler, the conduction between the C pole and the E pole of the optocoupler is triggered, or the P pole of the optical coupler is connected with the first end point, the N pole of the optical coupler is connected with the first end of the first resistor, the second end of the first resistor is grounded, the first current flows to the N pole of the optocoupler from the P pole of the optocoupler, conduction between the C pole and the E pole of the optocoupler is triggered, and the current led out from the N pole of the optocoupler is led into the ground after passing through the first resistor;
the first end of the second resistor is connected with a first power supply, and the second end of the second resistor is connected with the processor;
the first power supply outputs a third current, the second resistor limits the third current and derives a fourth current, and before the C pole of the optocoupler is conducted with the E pole, the fourth current is input into the processor, and the processor receives a first level signal;
when the pole C and the pole E of the optical coupler are conducted, the fourth current is conducted into the ground through a branch where the pole C and the pole E of the optical coupler are located, the level signal received by the processor is switched into the second level signal from the first level signal, the first level signal is higher than the second level signal, and the second level signal is used for indicating the processor to restore the electronic equipment to the initial state.
2. The reset circuit of claim 1, wherein the reset control module further comprises a first capacitor;
the first end of the first capacitor is connected with the pole C of the optocoupler, and the second end of the first capacitor is connected with the pole E of the optocoupler;
when the C pole and the E pole of the optical coupler are conducted, the fourth current charges the first capacitor, the first capacitor after the charging saturation discharges, and the current generated after the discharging is led into the ground, so that signal jitter generated in the process of switching the first level signal into the second level signal is removed.
3. The reset circuit according to claim 1 or 2, wherein the reset trigger module comprises at least a mosfet and a third resistor, and the detection trigger module comprises a triode;
the MOS tube has an S pole connected with a second power supply, a D pole connected with the second end point and a G pole connected with the collector of the triode;
the first end of the third resistor is connected with the second power supply, and the second end of the third resistor is connected with the G pole of the MOS tube;
when the triode works in a saturation region, the second power supply outputs a fifth current, and the fifth current comprises a first branch and a second branch;
the third resistor limits the current of the first branch current and derives a sixth current, the sixth current is led into the ground through a collector of the triode, and the voltage shared by the third resistor is reset trigger voltage;
the MOS tube is connected with the third resistor in parallel, the voltage of the MOS tube is the reset trigger voltage, the reset trigger voltage triggers the S pole and the D pole of the MOS tube to be conducted, the second branch is input into the S pole of the MOS tube, and the D pole of the MOS tube leads the first current to the second end point.
4. The reset circuit of claim 3, wherein the reset trigger module further comprises a second capacitor;
the first end of the second capacitor is connected with the second power supply, and the second end of the second capacitor is connected with the G pole of the MOS tube;
when the collector and the emitter of the triode are switched to a conducting state from an interruption state, the first branch current and the second branch current charge the second capacitor, the second capacitor after the charging saturation discharges, and the current generated after the discharging is led into the ground.
5. The reset circuit of claim 1 or 2, wherein the reset triggering module comprises at least a relay and a fourth resistor, the relay comprises a coil and a relay switch, and the detection triggering module comprises a triode;
the first end of the relay is connected with a second power supply, the second end of the relay is connected with the first end of the fourth resistor, and the third end of the relay is connected with a third power supply;
the second end of the fourth resistor is connected with the collector of the triode;
the first end of the coil is connected with the first end of the relay, and the second end of the coil is connected with the second end of the relay;
the first end of the relay switch is connected with the third end of the relay, and the second end of the relay switch is connected with the second end point;
when the collector and the emitter of the triode are in a conducting state, the third power supply outputs a seventh current, the seventh current flows into the coil through the first end of the relay, an eighth current is led out from the second end of the relay, and the eighth current is led into the ground through the collector of the triode after being limited by the fourth resistor;
and generating attractive force after the coil is electrified, wherein the attractive force triggers the relay switch to be closed so that the third power supply outputs the first current to the second end point through the third end of the relay and the relay switch.
6. The reset circuit of claim 5, wherein the relay further comprises a freewheeling diode;
the negative electrode of the freewheeling diode is connected with the first end of the coil, and the positive electrode of the freewheeling diode is connected with the second end of the coil;
when the collector and the emitter of the triode are switched to be in a closed state from a conducting state, the electric energy in the coil generates reverse electromotive force, the second end of the coil is a positive electrode, the first end of the coil is a negative electrode, the second end of the coil outputs ninth current, the tenth current is led out from the negative electrode of the diode through the positive electrode of the diode, the intensity of the tenth current is lower than that of the ninth current, and the coil continuously outputs the current until the electric energy of the coil is exhausted.
7. The reset circuit of claims 1 to 6, wherein the detection trigger module comprises at least the transistor and a fifth resistor;
the base electrode of the triode is connected with the first end of the fifth resistor, and the emitting electrode of the triode is grounded;
a second end of the fifth resistor is connected with the processor;
the processor outputs a detection current, the fifth resistor limits the detection current, and after the detection current is limited, a second end of the fifth resistor leads out a trigger current to the base electrode of the triode, wherein the trigger current is a level signal received by the base electrode of the triode;
when the level signal of the base electrode of the triode is switched from a third level signal to a fourth level signal, the fourth level signal is higher than the third level signal, the triode is switched from a cut-off state to a working state, and the collector electrode and the emitter electrode of the triode are conducted.
8. The reset circuit of claims 1-3, wherein the detection trigger module further comprises a sixth resistor;
the first end of the sixth resistor is connected with the processor, and the second end of the sixth resistor is grounded;
when the processor does not output a level signal to the base of the triode, the sixth resistor is used for ensuring that the potential of the base of the triode is the same as the ground.
9. The reset circuit according to claims 1 to 8, wherein the network interface included in the network interface module is an RJ45 interface, and the two different pins in the network interface are respectively a pin numbered 1 in an RJ45 interface and a pin numbered 8 in an RJ45 interface.
10. An electronic device, characterized in that the electronic device comprises: the reset circuit comprises a detection trigger module, a reset control module, a first endpoint and a second endpoint, wherein the first endpoint and the second endpoint are used for connecting two different pins in a network interface included in the network interface module, and the reset circuit is as set forth in any one of claims 1 to 9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010077000.7A CN111200425A (en) | 2020-01-23 | 2020-01-23 | Reset circuit and related electronic equipment |
| PCT/CN2021/073280 WO2021147994A1 (en) | 2020-01-23 | 2021-01-22 | Reset circuit and related electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010077000.7A CN111200425A (en) | 2020-01-23 | 2020-01-23 | Reset circuit and related electronic equipment |
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| CN111200425A true CN111200425A (en) | 2020-05-26 |
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| CN202010077000.7A Pending CN111200425A (en) | 2020-01-23 | 2020-01-23 | Reset circuit and related electronic equipment |
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| WO (1) | WO2021147994A1 (en) |
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| WO2021147994A1 (en) * | 2020-01-23 | 2021-07-29 | 华为技术有限公司 | Reset circuit and related electronic device |
| CN114597982A (en) * | 2020-12-04 | 2022-06-07 | 南昌逸勤科技有限公司 | Charging circuit, terminal device and charging system |
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| WO2021147994A1 (en) | 2021-07-29 |
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Application publication date: 20200526 |