CN112433890A - Reset circuit, chip and electronic product - Google Patents
Reset circuit, chip and electronic product Download PDFInfo
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- CN112433890A CN112433890A CN202011440165.2A CN202011440165A CN112433890A CN 112433890 A CN112433890 A CN 112433890A CN 202011440165 A CN202011440165 A CN 202011440165A CN 112433890 A CN112433890 A CN 112433890A
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- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/14—Error detection or correction of the data by redundancy in operation
- G06F11/1402—Saving, restoring, recovering or retrying
- G06F11/1415—Saving, restoring, recovering or retrying at system level
- G06F11/1441—Resetting or repowering
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F11/00—Error detection; Error correction; Monitoring
- G06F11/07—Responding to the occurrence of a fault, e.g. fault tolerance
- G06F11/14—Error detection or correction of the data by redundancy in operation
- G06F11/1402—Saving, restoring, recovering or retrying
- G06F11/1415—Saving, restoring, recovering or retrying at system level
- G06F11/1438—Restarting or rejuvenating
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Abstract
The application provides a reset circuit, a chip and an electronic product. The reset circuit provided by the embodiment can be used for repeatedly disconnecting the charging interface from the external power supply only by a user when the electronic product crashes, and sending a first signal to the reset control unit when the charging detection unit detects that the charging and power-off times of the electronic product in the preset time through the charging interface are greater than or equal to the preset times so that the reset control unit controls the electronic product to reset. The physical key for resetting is not required to be arranged, and the cost and the volume of the electronic product are reduced. In addition, whether the electronic product is halted or not is detected by outputting a clock signal at regular time when the electronic product works normally, and unnecessary power consumption waste is avoided. The electronic product is not required to be charged and restarted after the autonomous discharging of the electronic product is finished, the electronic product can be restarted by the aid of the reset circuit of the embodiment after the electronic product is halted, and user experience is improved on the basis of reducing power consumption.
Description
Technical Field
The application relates to the technical field of circuits, in particular to a reset circuit, a chip and an electronic product.
Background
At present, electronic products, such as mobile phones, tablet computers, wearable devices, and the like, may have a problem of crash of the electronic products due to system software running away or improper operation, which may cause the electronic products to fail to work normally and may have to perform operations such as restart or reset.
The existing electronic product adopts watchdog (Watch Dog) reset technology to reset and restart when the crash problem occurs, and the principle is as follows: the Watch Dog chip outputs a clock signal to the system at regular time, and if the product crashes, the system does not receive the clock signal within the specified time, and at the moment, the restart or reset of the system is triggered.
For the Watch Dog reset technology, the Watch Dog chip is required to continuously output a clock signal to the system, which results in high system power consumption.
Disclosure of Invention
The application provides a reset circuit, chip and electronic product to detect the electronic product crash through the mode of regularly sending clock signal among the solution prior art, thereby restart or reset when the electronic product crashes, and the problem that the consumption of the electronic product that causes is high.
In a first aspect, the present application provides a reset circuit, which is applied to an electronic product, the electronic product is provided with a charging interface, and the reset circuit includes: the charging detection unit is connected with the reset control unit;
the charging detection unit is used for sending a first signal to the reset control unit when detecting that the charging and power-off times of the electronic product in a preset time length through the charging interface are greater than or equal to a preset time, wherein the first signal is used for indicating the electronic product to be reset;
the reset control unit is used for receiving the first signal from the charging detection unit and controlling the electronic product to reset according to the first signal.
Optionally, the charging detection unit includes: the signal generating unit is connected with the charging interface and the signal identifying unit, and the signal identifying unit is also connected with the reset control unit;
the signal generating unit is used for generating a second signal when the electronic product is charged or disconnected once through the charging interface, outputting the second signal generated last time to the signal identifying unit when the time interval between the starting time of the second signal generated last time and the starting time of the second signal generated last time is smaller than a first preset time interval, and outputting the second signal generated last time to the signal identifying unit when the time interval between the ending time of the second signal generated last time and the starting time of the second signal generated first time in the preset time length is smaller than a second preset time interval, wherein the second signal is used for indicating that the electronic product is charged through the charging interface;
the signal identification unit is configured to receive the second signal from the signal generation unit, and output the first signal to the reset control unit if the number of times of receiving the second signal within a preset time period is greater than or equal to a preset number of times.
Optionally, the reset circuit further includes: the reset control unit is also connected with the power supply unit and the controller;
and the reset control unit is used for controlling the power supply unit to stop supplying power to the controller according to the first signal so as to restart the controller.
Optionally, the reset control unit is further configured to control the signal identification unit to output a third signal to the reset control unit according to the first signal, where the third signal is used to instruct the signal identification unit to reset.
Optionally, the signal generating unit includes: the first capacitor is connected between the charging interface and the first resistor, and the first resistor is grounded;
the first capacitor and the first resistor are used for generating a second signal when the electronic product is charged and disconnected every time through the charging interface, outputting the second signal generated last time to the signal identification unit when the time interval between the starting time of the second signal generated last time and the starting time of the second signal generated last time is smaller than a first preset time interval, and outputting the second signal generated last time to the signal identification unit when the time interval between the ending time of the second signal generated last time and the starting time of the second signal generated first time in the preset time interval is smaller than a second preset time interval.
Optionally, the signal identification unit includes: a DAC digital-to-analog conversion circuit and a comparator; the input end of the DAC circuit is connected with the signal generating unit, the output end of the DAC circuit is connected with the comparator, and the comparator is connected between the DAC circuit and the reset control unit;
the DAC digital-to-analog conversion circuit is used for receiving the second signal from the signal generating unit and sending a first voltage signal corresponding to the times to the comparator according to the times of the received second signal;
the comparator is configured to receive the first voltage signal from the DAC circuit, compare the first voltage signal with a reference voltage signal, and output the first signal to the reset control unit if a voltage value of the first voltage signal is greater than a voltage value of the reference voltage signal.
Optionally, the signal identification unit further includes a first voltage division module and a second voltage division module; the first voltage division module is respectively connected with the DAC circuit, a power supply unit of the electronic product and the comparator, the second voltage division module is respectively connected with the power supply unit and the comparator, and the second voltage division module is grounded;
the first voltage division module is used for dividing the voltage provided by the power supply unit to obtain a second voltage signal, adding the second voltage signal and the first voltage signal output by the DAC circuit, and inputting the added second voltage signal and the first voltage signal to the comparator;
the second voltage division module is configured to divide the voltage provided by the power supply unit to obtain the reference voltage signal, and input the reference voltage signal to the comparator.
Optionally, the first pressure dividing module includes: the first end of the second resistor is connected with the output end of the DAC, the second end of the second resistor is connected with the first end of the third resistor and the first input end of the comparator, and the second end of the third resistor is connected with the power supply unit;
the second resistor and the third resistor are used for dividing the voltage provided by the power supply unit, adding the voltage of the second resistor and the first voltage signal and inputting the voltage and the first voltage signal to a first input end of the comparator;
and/or the presence of a gas in the gas,
the second die division module includes: the first end of the fourth resistor is grounded, the second end of the fourth resistor is connected with the first end of the fifth resistor and the second input end of the comparator, and the second end of the fifth resistor is connected with the power supply unit;
and the fourth resistor and the fifth resistor are used for dividing the voltage provided by the power supply unit and inputting the voltage on the fourth resistor as the reference voltage to the second input end of the comparator.
In a second aspect, the present application provides a chip comprising a reset circuit as defined in any one of the first aspects.
In a third aspect, the present application provides an electronic product comprising the chip according to any one of the second aspect, or the reset circuit according to any one of the first aspect.
The application provides a reset circuit, chip and electronic product, when the electronic product appears crashing, only need the user to repeat the operation of disconnection again after being connected interface and external power source that charges, detect the number of times that the user charges for the electronic product through the interface that charges in predetermineeing time through the detection element that charges, when detecting that the electronic product is more than or equal to and predetermineeing the number of times through the interface that charges the power failure number of times of charging in predetermineeing time, send first signal to the reset control unit to make the reset control unit control electronic product reset. And a physical key specially used for resetting is not required to be arranged, so that the cost and the volume of the electronic product are reduced. In addition, whether the electronic product is halted or not is detected by outputting a clock signal at regular time when the electronic product works normally, and unnecessary power consumption waste is avoided. The electronic product is not required to be charged and restarted after the autonomous discharging of the electronic product is finished, the electronic product can be restarted by the aid of the reset circuit of the embodiment after the electronic product is halted, and user experience is improved on the basis of reducing power consumption.
Drawings
In order to more clearly illustrate the embodiments of the present application 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 introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a reset circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a reset circuit according to another embodiment of the present application;
FIG. 3 is a timing diagram provided in accordance with an embodiment of the present application;
fig. 4 is a schematic structural diagram of a signal generating unit according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a signal identification unit according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a reset circuit according to another embodiment of the present application;
fig. 7 is a schematic structural diagram of a signal identification unit according to another embodiment of the present application;
fig. 8 is a schematic structural diagram of a reset circuit according to another embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
When using an electronic product, the electronic product is usually crashed, for example, a large number of windows are opened in a computer, a large number of applications are opened in a mobile phone, and the like, which leads to the electronic product being crashed, and then the electronic product cannot work normally. When the electronic product is halted, the electronic product can be reset by carrying out operations such as restarting or resetting, and the electronic product can be normally used.
In the prior art, schemes for resetting an electronic product at least include the following:
the first method comprises the following steps: the electronic product is provided with a physical key for resetting, and when the electronic product is halted, the electronic product is restarted by long-pressing the physical key, for example, a startup key arranged on the side face of the mobile phone. However, this solution requires a dedicated physical button for reset on the electronic product, and is not suitable for electronic products with smaller size. Moreover, the scheme needs a related hardware circuit supporting long press restart on an internal hardware circuit board of the electronic product, so that the volume and the power consumption of the electronic product are increased.
And the second method comprises the following steps: the method is characterized in that a reset technology is built in the Watch Dog, namely when a system normally operates, a clock is output or interrupted to a Watch Dog module at fixed time by a Watch Dog chip, and if the system is halted, the action of the fixed time output is stopped, so that the system is triggered to restart or reset. Wherein, the Watch Dog technology is integrated in the MCU, but the Watch Dog built-in reset technology is only effective to the crash of a part of the system, when the system is blocked at an interruption layer, the 'brick change problem' can occur and the reset can not be realized, the wearing product is required to automatically discharge and end, the charger is connected again for activation, the power consumption of the electronic product is wasted, and the user experience is greatly influenced,
and the third is that: the external reset technology of the Watch Dog is characterized in that when a system normally operates, a clock is periodically output or interrupted to a Watch Dog module by a Watch Dog chip, and if the system is halted, so that the system is not triggered by the clock within a specified time, the MCU is forcibly restarted by the external Watch Dog. The technology can avoid the problem that the built-in reset technology of the Watch Dog is stuck at an interrupt layer, but the external Watch Dog chip is used for feeding dogs all the time, so that the system power consumption is high, and the standby time is sacrificed.
Therefore, in order to solve at least one problem existing in the prior art, the application provides a reset circuit, when the electronic product crashes, a user charges the electronic product continuously for multiple times, and hardware power-off restarting is realized by continuously switching on the charger for multiple times. The reset circuit provided by the application is used for triggering the hardware power-off restart of the electronic product when detecting that a user continuously charges the electronic product for multiple times.
Therefore, compared with the reset scheme in the prior art, the scheme for realizing hardware power-off restart of the electronic product through the reset circuit does not need to specially set a physical key for reset, saves the power consumption of the electronic product, prolongs the standby time of the electronic product and improves the user experience.
Fig. 1 is a schematic structural diagram of a reset circuit according to an embodiment of the present disclosure. The reset circuit 100 provided in this embodiment is applied to an electronic product, wherein, as shown in fig. 1, a charging interface is provided on the electronic product for charging the electronic product through a charger. It should be noted that the embodiment of the present application does not limit the type of the electronic product. Such as smart wearable devices, cell phones, etc.
As shown in fig. 1, the reset circuit 100 includes: a charge detection unit 110 and a reset control unit 120. One end of the charging detection unit 110 is connected to the charging interface, and the other end of the charging detection unit 110 is connected to the reset control unit 120.
Optionally, as shown in fig. 1, the reset circuit 100 may further include: a power supply unit 130 of the electronic product, and a controller 140. One end of the power supply unit 130 is connected to the charging interface, the other end of the power supply unit 130 is connected to the reset control unit 120, and the reset control unit 120 is connected to the controller 140. Optionally, the controller 140 may be, for example, a Micro Controller Unit (MCU).
In the reset circuit 100 shown in fig. 1, the charging detection unit 110 is configured to send a first signal to the reset control unit 120 when detecting that the number of times of charging and discharging the electronic product through the charging interface within a preset time period is greater than or equal to a preset number of times, where the first signal is used to instruct to reset the electronic product.
The reset control unit 120 is configured to receive the first signal from the charge detection unit 110 and control the electronic product to reset according to the first signal. Optionally, the reset control unit 120 is configured to control the power supply unit 130 to stop supplying power to the controller 140 according to the first signal, so that the controller 140 is restarted, thereby resetting the electronic product.
And the power supply unit 130 is used for charging the electronic product through the charging interface so as to provide electric energy for the electronic product.
Optionally, the power supply unit 130 includes a charging unit 131 and an energy storage unit 132, one end of the charging unit 131 is connected to the charging interface, the other end of the charging unit is connected to the energy storage unit 132, and the energy storage unit 132 is connected to the reset control unit 120. The charging unit 131 is used for acquiring electric energy through the charging interface and transmitting the electric energy to the energy storage unit 132 for storage. The energy storage unit 132 is used for storing electric energy when the charging unit 131 is connected to the charging interface, and releasing the electric energy when the charging unit 131 is not connected to the charging interface, so as to provide electric energy for the electronic product. As shown in fig. 1, the energy storage unit 132 supplies power to the controller 140 through the reset control unit 120, and it should be noted that the voltage V in fig. 1 isBATRepresenting the electrical energy provided by the energy storage unit 132.
For the reset circuit 100 shown in fig. 1, the operation principle is as follows:
when the electronic product is not in a dead halt and is in a normal working state, the electronic product does not need to be charged, and when the electronic product is in a running state, the energy storage unit 132 releases the stored electric energy, and the electronic product is supplied with power through the reset control unit 120, so that the electronic product is in the running state. When the electronic product is charged, the charging unit 131 is connected to an external power source through a charger, obtains electric energy, and transmits the electric energy to the energy storage unit 132 to store the electric energy in the energy storage unit 132.
When the electronic product is halted, the controller 140 cannot operate, and the user repeatedly performs the operation of disconnecting the charging interface from the external power supply through the charger. Here, the charging detection unit 110 may detect the user's operation each time the user performs an operation of disconnecting the charging interface from the external power supply through the charger. For example, when the user connects the charging interface with the external power source through the charger, the charging detection unit 110 detects a voltage at the charging interface, where V in fig. 1inRepresenting the voltage of the charging interface.
The charging detection unit 110 determines that the user connects the charging interface with the external power source through the charger by detecting the voltage. When the user disconnects the charger from the external power source, that is, the charging interface is disconnected from the external power source, the charging detection unit 110 cannot detect the voltage, and determines that the charging interface is disconnected from the external power source.
It should be noted that, when the electronic product crashes, the user repeatedly performs the operation of disconnecting the charging interface from the external power supply through the charger, so as to avoid the misjudgment problem caused by poor single contact due to improper operation when the electronic product is normally charged. For example, in this application scenario, after the user connects the charging interface with the external power supply through the charger, the user may touch the charger inadvertently, which may cause poor contact between the charger and the external power supply, and the charging interface may not detect the voltage.
Moreover, after the user connects the charging interface with the external power source through the charger, the user needs to disconnect the charging interface in a short time (for example, 1s or less), so as to avoid that the normal charging operation is mistakenly judged as the electronic product crash and the charging operation is restarted. For example, in the application scenario, when the electronic product is in a normal working state and needs to be charged, after the user connects the charging interface with the external power supply through the charger, the electronic product obtains electric energy after charging for 5min, the normal working state can be maintained, and the user disconnects the charger from the external power supply. If the electronic product considers the operation in the scene as the electronic product crash and the restarting charging operation is performed, the normal charging function of the electronic product is affected.
If the number of times that the user repeatedly performs the operation of disconnecting the charging interface from the external power supply through the charger within the preset time reaches the preset number of times, that is, when the charging detection unit 110 detects that the number of times of charging and disconnecting the electronic product within the preset time through the charging interface is greater than or equal to the preset number of times, the first signal is sent to the reset control unit 120. The first signal is used for indicating the reset of the electronic product.
If the preset duration may be 2s, and the preset number of times may be 3 times, for example, the charging detection unit 110 sends the first signal to the reset control unit 120 when detecting that the number of times of charging and powering off the electronic product in 2s through the charging interface is greater than or equal to 3 times.
The reset control unit 120 receives the first signal sent by the charging detection unit 110, and controls the electronic product to reset according to the first signal.
Optionally, after receiving the first signal sent by the charging detection unit 110, the reset control unit 120 cuts off a power supply path through which the energy storage unit 132 supplies power to the controller 140, so that the controller 140 is restarted.
Optionally, when the electronic product is not halted and is in a normal working state, the electronic product is charged through the charging interface, at this time, the electronic product is normally charged through the charging device, the signal output by the charging detection unit 110 to the reset control unit 120 is a low-level signal, when the charging detection unit 110 detects that the number of times of charging and disconnecting the electronic product through the charging interface within a preset time is greater than or equal to the preset number of times, the signal output by the charging detection unit 110 to the reset control unit 120 is switched, and the first signal is switched to a high-level signal, so that the reset control unit 120 detects that the signal sent by the charging detection unit 110 is switched, thereby controlling the electronic product to reset.
Optionally, the reset control unit 120 includes a load switch, and the load switch may be turned on or off by an enable pin, and when receiving the first signal, the power supply path between the energy storage unit 132 and the controller 140 is cut off by the pin, so that the energy storage unit 132 stops supplying power to the controller 140.
The reset circuit provided by the embodiment can be used for repeatedly disconnecting the charging interface from the external power supply only by the user when the electronic product crashes, detecting the number of times of charging the electronic product through the charging interface within the preset time by the charging detection unit, and sending a first signal to the reset control unit when detecting that the number of times of charging and disconnecting the electronic product through the charging interface within the preset time is greater than or equal to the preset number of times so as to enable the reset control unit to control the electronic product to reset. And a physical key specially used for resetting is not required to be arranged, so that the cost and the volume of the electronic product are reduced. In addition, whether the electronic product is halted or not is detected by outputting a clock signal at regular time when the electronic product works normally, and unnecessary power consumption waste is avoided. The electronic product is not required to be charged and restarted after the autonomous discharging of the electronic product is finished, the electronic product can be restarted by the aid of the reset circuit of the embodiment after the electronic product is halted, and user experience is improved on the basis of reducing power consumption.
On the basis of the foregoing embodiments, fig. 2 is a schematic structural diagram of a reset circuit according to another embodiment of the present application. As shown in fig. 2, the charge detection unit 110 includes: a signal generation unit 111 and a signal identification unit 112.
The signal generation unit 111 is connected to the charging interface and the signal recognition unit 112, and the signal recognition unit 112 is further connected to the reset control unit 120.
With the reset circuit 100 shown in fig. 2, the signal generating unit 111 is configured to generate a second signal each time the electronic product is charged through the charging interface, output the last generated second signal to the signal identifying unit when a time interval between a start time of the last generated second signal and a start time of the last generated second signal is smaller than a first preset time interval, and output the last generated second signal to the signal identifying unit 112 when a time interval between an end time of the last generated second signal and the start time of the first generated second signal within a preset time period is smaller than a second preset time interval, where the second signal is used to indicate that the electronic product is charged or discharged through the charging interface. Optionally, the second signal is a voltage signal.
The signal identification unit 112 is configured to receive the second signal from the signal generation unit 111, and output the first signal to the reset control unit 120 if the number of times of receiving the second signal in the preset time period is greater than or equal to a preset number of times.
The reset circuit 100 shown in fig. 2 operates according to the following principle:
as shown in fig. 3, the low level signal indicates that the electronic product is not charged through the charging interface, and the high level signal indicates that the electronic product is charged through the charging interface. Therefore, the rising edge of the signal indicates that the user connects the charging interface of the electronic product with the external power supply through the charger to charge the electronic product, and the falling edge of the signal indicates that the user pulls the charger out of the external power supply, the charging interface of the electronic product is disconnected with the external power supply, and the charging of the electronic product is finished. In this case, the electronic product is restarted by charging 3 times in 2 s.
When the electronic product is halted, the user repeatedly performs the operation of disconnecting the charging interface of the electronic product from the external power supply through the charger. When the user connects the charging interface with the external power source through the charger for the first time, the signal generating unit 111 detects a voltage at the charging interface, which indicates that the electronic product is charged through the charging interface, and generates a rising edge, such as the first rising edge in fig. 3, to generate the second signal. Wherein, V in FIG. 2CHGRepresenting the second signal.
Alternatively, as shown in fig. 3, the second signal may be, for example, a high level signal. Then, the user pulls the charger out of the external power supply, disconnects the charging interface from the external power supply, and the signal generation unit 111 detects that the charging interface of the electronic product is disconnected from the external power supply, thereby generating a falling edge.
After a period of time, when the user connects the charging interface with the external power supply through the charger for the second time, the signal generating unit 111 detects that the electronic product is charged through the charging interface again, and generates a rising edge again, such as the second rising edge in fig. 3, to generate a second signal. If the time interval between two rising edges is smaller than a first preset time interval, wherein the first preset time interval is, for example, 600ms, that is, the time interval between the starting time of the second signal generated for the second time and the starting time of the second signal generated for the first time is smaller than the first preset time interval, the signal generating unit 111 outputs the second signal generated for the first time to the signal identifying unit 112.
By repeating the above operations, for the third time the user connects the charging interface with the external power source through the charger, the signal generating unit 111 detects the charging of the electronic product through the charging interface again, and generates a rising edge again, such as the third rising edge in fig. 3, to generate a second signal. Then, the user pulls the charger out of the external power supply, disconnects the charging interface from the external power supply, and the signal generation unit 111 detects that the charging interface of the electronic product is disconnected from the external power supply, thereby generating a falling edge.
At this time, if a time interval between the first rising edge and the third falling edge is less than a second preset time interval, that is, a time interval between an end time of the second signal generated for the third time and a start time of the first generation of the second signal within 2s is less than the second preset time interval, wherein the second preset time interval is less than or equal to 2s, the signal generation unit 111 outputs the second signal generated for the third time to the signal recognition unit 112.
It should be noted that, the time interval between two consecutive times of connection of the charging interface and the external power supply by the user through the charger may be unequal or equal, and the time duration of each charging may be unequal or equal, and it is only necessary to determine the time interval between the start time of the second signal generated at the present time and the start time of the second signal generated at the last time and the size of the first preset time interval, and the time interval between the end time of the second signal generated at the last time and the start time of the second signal generated at the first time and the size of the second preset time interval.
The signal identification unit 112 receives the second signal sent by the signal generation unit 111, and outputs the first signal to the reset control unit 120 when the number of times of receiving the second signal in 2s is greater than or equal to 3 times, so that the reset control unit 120 controls the electronic product to restart.
After the reset control unit 120 controls the electronic product to restart, the electronic product is restarted by the reset circuit 100 when the electronic product is crashed next time. Therefore, optionally, when the reset control unit 120 controls the electronic product to restart, the reset control unit 120 further controls the signal identification unit 112 to output a third signal to the reset control unit 120 according to the first signal. The third signal is used to instruct the signal identifying unit 112 to reset.
After receiving the third signal, the signal identification unit 112 resets to prepare for restarting the electronic product next time.
In the embodiment, whether the operation that the user continuously connects and disconnects the charging interface and the external power supply through the charger within the preset time reaches the preset times is detected through the reset circuit. When the fact that the user continuously enables the charging interface to be connected with the external power supply through the charger within the preset time is detected, the electronic product is restarted, the electronic product is simple to restart, whether the electronic product is halted or not is detected through timing output clock signals when the electronic product works normally, and unnecessary power consumption waste is avoided. The electronic product is not required to be charged and restarted after the autonomous discharging of the electronic product is finished, the electronic product can be restarted by the aid of the reset circuit of the embodiment after the electronic product is halted, and user experience is improved on the basis of reducing power consumption.
On the basis of the above embodiments, fig. 4 is a schematic structural diagram of a signal generating unit according to an embodiment of the present application. As shown in fig. 4, the signal generation unit 111 includes: a first capacitor C1 and a first resistor R1. The first capacitor C1 is connected between the charging interface and the first resistor R1, and the first resistor R1 is grounded. Optionally, as shown in fig. 4, the signal generating unit 111 may further include: a sixth resistor R6. One end of the sixth resistor R6 is connected to the first capacitor C1, and the other end is connected to the signal identifying unit 112.
In the reset circuit 100 including the signal identification unit 112 shown in fig. 4, the first capacitor C1 and the first resistor R1 are configured to generate a second signal every time the electronic product is charged and discharged through the charging interface, output the last generated second signal to the signal identification unit 112 when a time interval between a start time of the second signal generated at the current time and a start time of the second signal generated at the last time is smaller than a first preset time interval, and output the second signal generated at the current time to the signal identification unit 112 when a time interval between an end time of the second signal generated at the last time and the start time of the second signal generated at the first time within a preset time period is smaller than a second preset time interval.
For the signal generation unit 111 shown in fig. 4, the operation principle is:
in the signal generating unit 111, the second signal is generated each time the user connects the electronic product charging interface with the external connection source through the charger to charge the electronic product. The first capacitor C1 and the first resistor R1 form a series RC charging/discharging circuit, and a high-pass filter is formed by the first resistor R1 and the first capacitor C1 by blocking dc and turning on ac by the capacitor. By adjusting the capacitance of the first capacitor C1 and the resistance of the first resistor R1, the frequency of the signal that passes through the first resistor R1 and the first capacitor C1 to form the high pass filter, i.e., the frequency of the second signal, i.e., the time interval between two consecutive charges of the electronic product by the user, can be adjusted, thereby controlling whether to transmit the second signal to the signal recognition unit 112.
For example, the period T of the high-level signal is set to about 500ms, and the capacitance value of the first capacitor C1 and the resistance value of the first resistor R1 are selected appropriately, for example, 230K is taken as R1, 2.2uf is taken as C1, which results in T being 0.506s being 506ms, and the first preset time interval is T, and the frequency f of the high-level signal obtained according to the period T is about 2 HZ. That is, when the time interval between the start time of the second signal generated at the previous time and the start time of the second signal generated at the previous time is less than 506s, the second signal generated at the previous time may be transmitted to the signal identification unit 112 through the first resistor R1 and the first capacitor C1 to form a high pass filter. When the frequency is less than 2HZ, that is, the time interval between the start time of the second signal generated at the present time and the start time of the second signal generated at the last time is greater than or equal to 506s, the second signal is introduced into GND through the first resistor R1 and is not output to the signal identifying unit 112.
And, for the second signal obtained last within 2s, if the time interval between the end time of the second signal generated last and the start time of the second signal generated first is smaller than a second preset time interval, wherein the second preset time interval is smaller than or equal to 2s, which indicates that the frequency is greater than 2HZ for the second signal generated last, the second signal generated last is transmitted to the signal identifying unit 112.
The signal generating unit 111 provided in this embodiment forms the high pass filter by the first capacitor and the first resistor, and controls the time interval between two consecutive times of connection of the charging interface and the external power supply by the user through the charger, so that the reset circuit can restart the electronic product more accurately according to the operation of the user, thereby avoiding misjudgment and improving user experience.
On the basis of the above embodiments, fig. 5 is a schematic structural diagram of a signal identification unit according to an embodiment of the present application. As shown in fig. 5, the signal identifying unit 112 includes: a DAC digital-to-analog conversion circuit U1 and a comparator U2. The DAC digital-to-analog conversion circuit U1 has an input terminal connected to the signal generating unit 111, an output terminal connected to the comparator U2, and a comparator U2 connected between the DAC digital-to-analog conversion circuit U1 and the reset control unit 120.
In the reset circuit 100 including the signal recognition unit 112 shown in fig. 5, the DAC digital-to-analog conversion circuit U1 receives the second signal from the signal generation unit 111 and transmits a first voltage signal corresponding to the number of times to the comparator U2 according to the number of times the second signal is received.
And the comparator U2 is configured to receive the first voltage signal from the DAC digital-to-analog conversion circuit U1, compare the first voltage signal with a reference voltage signal, and output the first signal to the reset control unit 120 if the voltage value of the first voltage signal is greater than the voltage value of the reference voltage signal.
For the signal identification unit 112 shown in fig. 5, the operation principle is as follows:
the DAC digital-to-analog conversion circuit U1 receives the second signal and generates an analog voltage signal according to the number of times the second signal is received, and in this embodiment, the analog voltage signal is denoted as the first voltage signal. The first voltage signal is then output to the comparator U2. The comparator U2 provides power through the energy storage unit 132.
It should be noted that, in some possible embodiments, as shown in fig. 5, the DAC digital-to-analog conversion circuit U1 includes: a seventh resistor R7, an eighth resistor R8 and a digital-to-analog converter DAC. One end of the seventh resistor R7 is connected to the signal generating unit 111, the other end is connected to the eighth resistor R8 and the digital-to-analog converter DAC, and the eighth resistor R8 is grounded. The digital-to-analog converter DAC is connected to the comparator U2 and is powered by the energy storage unit 132.
The seventh resistor R7 and the eighth resistor R8 form a voltage divider circuit, divide the second signal, and input the divided voltage as the second signal to the digital-to-analog converter DAC. And the DAC outputs a corresponding first voltage signal according to the received times of the divided voltage.
Optionally, the second signal is 5V, the divided voltage obtained by passing through the seventh resistor R7 and the eighth resistor R8 is 2.5V, and 2.5V is input to the digital-to-analog converter DAC as the second signal. The digital-to-analog converter DAC is a 4-bit digital-to-analog conversion IC with a resolution of 24, i.e. the second signal input to the digital-to-analog converter DAC is divided equally into 16 levels by the digital-to-analog converter DAC, the input voltage of each level being in increments. When the digital-to-analog converter DAC receives no second signal, the output of the digital-to-analog converter DAC is 0, when a second signal is received, the first voltage signal output to the comparator U2 by the digital-to-analog converter DAC is 0.156V, when 2 second signals are received, the first voltage signal output to the comparator U2 is 0.312V, when 3 second signals are received, the first voltage signal output to the comparator U2 is 0.468V, and so on.
Each time the comparator U2 receives a first voltage signal, the comparator U2 compares the first voltage signal to a reference voltage signal. The first voltage signal is inputted to the positive input terminal of the comparator U2, and the reference voltage signal is inputted to the negative input terminal.
When the electronic product is not halted and normally works, the voltage input by the positive input end of the comparator U2 is less than the reference voltage signal input by the negative input end, and the comparator U2 outputs a low level. After the electronic product is halted, if the signal generating unit 111 generates the second signal and transmits the second signal to the DAC digital-to-analog converting circuit U1, the DAC digital-to-analog converting circuit U1 inputs the first voltage signal of the corresponding voltage value according to the received second signal times. When the first voltage signal input to the positive input terminal of the comparator U2 is greater than the reference voltage signal, the comparator U2 outputs a high level to the reset control unit, wherein the high level is the first signal.
On the basis of the foregoing embodiments, fig. 6 is a schematic structural diagram of a reset circuit according to another embodiment of the present application. As shown in fig. 6, the signal generating unit 111 in the reset circuit 100 is the signal generating unit 111 shown in fig. 4, and the signal identifying unit 112 is the signal identifying unit 112 shown in fig. 5.
The working principle of the reset circuit 100 shown in fig. 6 can refer to any one of the reset circuit embodiments described above and the embodiments shown in fig. 4 and fig. 5, and details thereof are not repeated here.
On the basis of the embodiment shown in fig. 5, fig. 7 is a schematic structural diagram of a signal identification unit according to another embodiment of the present application. As shown in fig. 7, the signal identifying unit 112 further includes: a first die divider 1121 and a second die divider block 1122. The first voltage division block 1121 is connected to the DAC digital-to-analog conversion circuit U1, the power supply unit 130 of the electronic product, and the comparator U2, respectively, the second voltage division block 1122 is connected to the power supply unit 130 and the comparator U2, respectively, and the second voltage division block 1122 is grounded.
In the reset circuit 100 including the signal identifying unit 112 shown in fig. 7, the first voltage dividing module 1121 is configured to divide the voltage provided by the power supply unit 130 to obtain a second voltage signal, add the second voltage signal and the first voltage signal output by the DAC digital-to-analog conversion circuit U1, and input the result to the comparator U2.
The second voltage division module 1122 is configured to divide the voltage provided by the power supply unit 130, obtain a reference voltage signal, and input the reference voltage signal to the comparator U2.
Alternatively, as shown in fig. 7, the first voltage division module 1121 includes: a second resistor R2 and a third resistor R3. The first end of the second resistor R2 is connected to the output end of the DAC digital-to-analog conversion circuit U1, the second end is connected to the first end of the third resistor R3 and the first input end of the comparator U2, and the second end of the third resistor R3 is connected to the power supply unit 130.
Alternatively, as shown in fig. 7, the second division module 1122 includes: a fourth resistor R4 and a fifth resistor R5. The first end of the fourth resistor R4 is grounded, the second end is connected to the first end of the fifth resistor R5 and the second input end of the comparator U2, and the second end of the fifth resistor R5 is connected to the power supply unit 130.
As shown in fig. 8, in the reset circuit 100 including the signal recognition unit 112 shown in fig. 7, the second resistor R2 and the third resistor R3 are used to divide the voltage provided by the power supply unit 130, and the voltage of the second resistor R2 is added to the first voltage signal and then input to the first input terminal of the comparator U2.
A fourth resistor R4 and a fifth resistor R5, which are used to divide the voltage provided by the power supply unit 130, and input the voltage across the fourth resistor R4 as a reference voltage to the second input terminal of the comparator U2.
The signal identification unit 112 shown in fig. 7 operates according to the following principle:
with respect to the signal identifying unit 112 shown in fig. 7, the second resistor R2 and the third resistor R3 are used to divide the voltage provided by the energy storage unit 132, and the voltage across the second resistor R2 is used as a second voltage signal, which is superimposed with the first voltage signal output by the DAC digital-to-analog conversion circuit U1 and then input to the positive input terminal of the comparator U2.
The fourth resistor R4 and the fifth resistor R5 are used for dividing the voltage provided by the energy storage unit 132, and the voltage across the fourth resistor R4 is used as a reference voltage signal and is input to the negative input terminal of the comparator U2.
The comparator U2 compares the voltage signal input through the positive input terminal with the voltage signal input through the negative input terminal, and outputs a first signal according to the comparison result.
For example, R2 ═ 400K Ω, R3 ═ 600K Ω, R4 ═ R5 ═ 1000K Ω, and the voltage V provided by the energy storage unit 132BATAt 4V, the second resistor R2 divides the obtained second voltage signal, i.e. the graphThe voltage at point a in 7 is obtained by equation one:
the reference voltage signal obtained by dividing the voltage by the second resistor R4, i.e., the voltage at point B in fig. 7, is obtained by equation two:
for the signal identifying unit 112 shown in fig. 7, the reference voltage signal input to the negative input terminal of the comparator U2 is UB2V. When the electronic product does not crash and is in a normal working state, or the electronic product crashes, a user performs charging and breakpoint operations on the electronic product for multiple times within a preset time period, however, when the number of times of the second signal output by the signal generating unit 111 to the signal identifying unit 112 within the preset time period is less than the preset number of times, the first voltage signal output by the DAC digital-to-analog conversion circuit U1 is 0V. At this time, the voltage inputted to the positive input terminal of the comparator U2 is only the second voltage signal UA1.6V. Comparator U2 pair UAAnd UBMake a comparison, at this time, UA<UBThe comparator U2 outputs a low level.
When the electronic product is halted, a user performs charging and breakpoint operations on the electronic product for multiple times within a preset time period, and when the number of times of the second signal output to the signal identification unit 112 by the signal generation unit 111 within the preset time period satisfies a preset number of times, for example, when the number of times of the second signal output to the signal identification unit 112 by the signal generation unit 111 within 2s is 3 times, the first voltage signal output by the DAC digital-to-analog conversion circuit U1 is 0.468V. At this time, the voltage input to the positive input terminal of the comparator U2 is the first voltage signal and the second voltage signal UA1.6V, 0.468V +1.6V, 2.068V. The comparator U2 compares the voltage signal 2.068V inputted through the positive input terminal with the voltage signal 2V inputted through the negative input terminal, and at this time, the voltage signal inputted through the positive input terminal in the comparator U2 is larger than that inputted through the negative input terminalIn response to the incoming voltage signal, the comparator U2 outputs a high level, i.e., outputs a first signal.
The working principle of the reset circuit 100 shown in fig. 8 can refer to any one of the reset circuit embodiments described above and the embodiments shown in fig. 4, fig. 5, and fig. 7, and will not be described herein again.
Based on the technical idea of the present application, an embodiment of the present application further provides a chip, where the chip includes the reset circuit 100 provided in any of the above embodiments.
The implementation principle and technical effects of the chip provided in this embodiment can refer to the reset circuit in any of the above-mentioned embodiments, and are not described herein again.
Based on the technical idea of the present application, an electronic product is further provided in the embodiments of the present application, where the electronic product includes the reset circuit 100 provided in any of the above embodiments, or the electronic product includes a chip, and the chip includes the reset circuit 100 provided in any of the above embodiments.
And the reset circuit is used for controlling the electronic product to reset and restart when the electronic product is halted.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. The utility model provides a reset circuit, is applied to electronic product, be provided with the interface that charges on the electronic product, its characterized in that, reset circuit includes: a charge detection unit and a reset control unit;
the charging detection unit is used for sending a first signal to the reset control unit when detecting that the charging and power-off times of the electronic product in a preset time length through the charging interface are greater than or equal to a preset time, wherein the first signal is used for indicating the electronic product to be reset;
the reset control unit is used for receiving the first signal from the charging detection unit and controlling the electronic product to reset according to the first signal.
2. The reset circuit according to claim 1, wherein the charge detection unit includes: the charging interface is connected with the charging unit, and the signal identification unit is connected with the charging interface;
the signal generating unit is used for generating a second signal when the electronic product is charged or disconnected once through the charging interface, outputting the second signal generated last time to the signal identifying unit when the time interval between the starting time of the second signal generated last time and the starting time of the second signal generated last time is smaller than a first preset time interval, and outputting the second signal generated last time to the signal identifying unit when the time interval between the ending time of the second signal generated last time and the starting time of the second signal generated first time in the preset time length is smaller than a second preset time interval, wherein the second signal is used for indicating that the electronic product is charged through the charging interface;
the signal identification unit is configured to receive the second signal from the signal generation unit, and output the first signal to the reset control unit if the number of times of receiving the second signal within a preset time period is greater than or equal to a preset number of times.
3. The reset circuit of claim 2, wherein the reset circuit further comprises: a power supply unit and a controller of the electronic product;
and the reset control unit is used for controlling the power supply unit to stop supplying power to the controller according to the first signal so as to restart the controller.
4. The reset circuit of claim 3, wherein the reset control unit is further configured to control the signal identification unit to output a third signal to the reset control unit according to the first signal, and the third signal is used to instruct the signal identification unit to reset.
5. The reset circuit according to any one of claims 2 to 4, wherein the signal generation unit includes: the first capacitor is connected between the charging interface and the first resistor, and the first resistor is grounded;
the first capacitor and the first resistor are used for generating a second signal when the electronic product is charged and disconnected every time through the charging interface, outputting the second signal generated last time to the signal identification unit when the time interval between the starting time of the second signal generated last time and the starting time of the second signal generated last time is smaller than a first preset time interval, and outputting the second signal generated last time to the signal identification unit when the time interval between the ending time of the second signal generated last time and the starting time of the second signal generated first time in the preset time interval is smaller than a second preset time interval.
6. The reset circuit according to claim 3 or 4, wherein the signal identifying unit comprises: a DAC digital-to-analog conversion circuit and a comparator;
the DAC digital-to-analog conversion circuit is used for receiving the second signal from the signal generating unit and sending a first voltage signal corresponding to the times to the comparator according to the times of the received second signal;
the comparator is configured to receive the first voltage signal from the DAC circuit, compare the first voltage signal with a reference voltage signal, and output the first signal to the reset control unit if a voltage value of the first voltage signal is greater than a voltage value of the reference voltage signal.
7. The reset circuit of claim 6, wherein the signal identification unit further comprises a first voltage division module and a second voltage division module; the first voltage division module is respectively connected with the DAC circuit, a power supply unit of the electronic product and the comparator, the second voltage division module is respectively connected with the power supply unit and the comparator, and the second voltage division module is grounded;
the first voltage division module is used for dividing the voltage provided by the power supply unit to obtain a second voltage signal, adding the second voltage signal and the first voltage signal output by the DAC circuit, and inputting the added second voltage signal and the first voltage signal to the comparator;
the second voltage division module is configured to divide the voltage provided by the power supply unit to obtain the reference voltage signal, and input the reference voltage signal to the comparator.
8. The reset circuit of claim 7, wherein the first voltage division module comprises: the first end of the second resistor is connected with the output end of the DAC, the second end of the second resistor is connected with the first end of the third resistor and the first input end of the comparator, and the second end of the third resistor is connected with the power supply unit;
the second resistor and the third resistor are used for dividing the voltage provided by the power supply unit, adding the voltage of the second resistor and the first voltage signal and inputting the voltage and the first voltage signal to a first input end of the comparator;
and/or the presence of a gas in the gas,
the second die division module includes: the first end of the fourth resistor is grounded, the second end of the fourth resistor is connected with the first end of the fifth resistor and the second input end of the comparator, and the second end of the fifth resistor is connected with the power supply unit;
and the fourth resistor and the fifth resistor are used for dividing the voltage provided by the power supply unit and inputting the voltage on the fourth resistor as the reference voltage to the second input end of the comparator.
9. A chip, comprising: a reset circuit as claimed in any one of claims 1 to 8.
10. An electronic product, comprising: a chip as claimed in claim 9, or a reset circuit as claimed in any one of claims 1 to 8.
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