CN212541261U - Shutdown reset circuit and electronic equipment - Google Patents
Shutdown reset circuit and electronic equipment Download PDFInfo
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- CN212541261U CN212541261U CN202021421378.6U CN202021421378U CN212541261U CN 212541261 U CN212541261 U CN 212541261U CN 202021421378 U CN202021421378 U CN 202021421378U CN 212541261 U CN212541261 U CN 212541261U
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Abstract
The application discloses shutdown reset circuit and electronic equipment belongs to electron electrical technology field. The shutdown reset circuit is used for the electronic device and is provided with a detection end used for being connected with a power supply end of the electronic device, and the shutdown reset circuit comprises a shutdown detection sub-circuit and a reset sub-circuit; the shutdown detection sub-circuit is respectively connected with the detection end and the reset sub-circuit and is configured to provide an enabling signal to the reset sub-circuit when the voltage value at the detection end is smaller than a voltage threshold value; the reset sub-circuit is configured to conduct the detection terminal to a common terminal of the electronic device and the shutdown reset circuit when receiving the enable signal from the shutdown detection sub-circuit. The problem that the electronic device is easy to be started abnormally in the continuous starting and shutdown processes can be solved.
Description
Technical Field
The application relates to the technical field of electronics and electricity, in particular to a shutdown reset circuit and electronic equipment.
Background
Shutdown generally refers to a process in which an electronic device stops operating after power is lost. In an exemplary shutdown process, the power supply terminal of the electronic device loses the supply of the power supply voltage, and then the voltage of the power supply terminal gradually decreases with the discharge of the internal capacitance of the electronic device, so that the electronic device gradually stops working.
In the continuous process of starting and shutting down, some electronic devices are easy to have the problem of being incapable of starting. For example, in some chip-type electronic devices, if the processes of stopping and resuming the supply of the power supply voltage are repeated several times in a short time, it is easy to cause an abnormal situation in which the electronic device cannot be normally started at the time of starting up, for example, a dead halt state without response is caused.
Disclosure of Invention
The application provides a shutdown reset circuit and electronic equipment, which can help solve the problem that the electronic device is easy to be started in the continuous startup and shutdown processes.
In a first aspect, an embodiment of the present application provides a shutdown reset circuit, where the shutdown reset circuit is used for an electronic device, the electronic device has a power supply terminal for accessing a power supply voltage, the shutdown reset circuit has a detection terminal for connecting the power supply terminal of the electronic device, and the shutdown reset circuit includes a shutdown detection sub-circuit and a reset sub-circuit;
the shutdown detection sub-circuit is respectively connected with the detection end of the shutdown reset circuit and the reset sub-circuit, and the shutdown detection sub-circuit is configured to provide an enabling signal to the reset sub-circuit when the voltage value at the detection end of the shutdown reset circuit is smaller than a voltage threshold value;
the reset sub-circuit is configured to conduct a power supply terminal of the electronic device to a common terminal of the electronic device and the shutdown reset circuit upon receiving the enable signal from the shutdown detection sub-circuit.
In a possible implementation manner, the voltage threshold is smaller than a voltage value of a power supply voltage provided by the power supply terminal when the electronic device is in normal operation and larger than a minimum voltage value of the power supply voltage provided by the power supply terminal when the electronic device is in normal operation; the shutdown detection sub-circuit comprises a voltage division unit, a voltage stabilization unit and a comparison unit; wherein,
the voltage dividing unit is respectively connected with the detection end of the shutdown reset circuit and the comparison unit, and is configured to provide a first voltage obtained by dividing the voltage on the detection end to the comparison unit;
the voltage stabilizing unit comprises a voltage stabilizing element, is connected with the comparing unit and is configured to provide a second voltage obtained by the voltage stabilizing element to the comparing unit;
the comparison unit is connected with the reset sub-circuit and is configured to provide the enable signal to the reset sub-circuit when the first voltage is smaller than the second voltage.
In a possible implementation manner, the voltage dividing unit includes a first resistor and a second resistor, the voltage stabilizing unit includes a third resistor and a first voltage regulator tube, and the comparing unit includes an operational amplifier; wherein,
one end of the first resistor is connected with the detection end of the shutdown reset circuit, the other end of the first resistor is connected with the positive phase detection end of the operational amplifier,
one end of the second resistor is connected with the positive phase detection end of the operational amplifier, the other end of the second resistor is connected with the common end,
one end of the third resistor is connected with the detection end of the shutdown reset circuit, the other end of the third resistor is connected with the inverted detection end of the operational amplifier,
the negative electrode of the first voltage-stabilizing tube is connected with the inverted detection end of the operational amplifier, the positive electrode of the first voltage-stabilizing tube is connected with the common end,
the output end of the operational amplifier is connected with the reset sub-circuit.
In one possible implementation, the reset sub-circuit includes a first switching unit and a second switching unit,
the first switch unit is respectively connected with the shutdown detection sub-circuit and the second switch unit, the first switch unit is configured to provide an opening signal to the second switch unit when receiving the enabling signal from the shutdown detection sub-circuit,
the second switch unit is connected to the common terminal, the second switch unit is used for connecting a power supply terminal of the electronic device, and the second switch unit is configured to conduct the power supply terminal of the electronic device to the common terminal when receiving the turn-on signal from the first switch unit.
In one possible implementation, the first switching unit includes a first transistor and a fourth resistor, the second switching unit includes a second transistor,
the grid electrode of the first transistor is connected with the shutdown detection subcircuit, the first pole of the first transistor is connected with the grid electrode of the second transistor, the second pole of the first transistor is connected with the common terminal,
one end of the fourth resistor is used for connecting a power supply end of the electronic device, the other end of the fourth resistor is connected with the grid electrode of the second transistor,
a first pole of the second transistor is used for connecting a power supply end of the electronic device, a second pole of the second transistor is connected with the common end,
wherein the first pole and the second pole are one of a source and a drain, respectively.
In a possible implementation manner, the reset sub-circuit further includes a fifth resistor, and the first pole of the second transistor is further configured to be connected to a power supply terminal of the electronic device through the fifth resistor.
In a possible implementation manner, the shutdown reset circuit further includes a charge-discharge electronic circuit, where the charge-discharge electronic circuit is used to connect to a power supply end of the electronic device, and the charge-discharge electronic circuit is configured to be charged by a power supply voltage on the power supply end, and to supply power to the power supply end of the electronic device by using electric energy stored in charging when the power supply end loses supply of the power supply voltage.
In one possible implementation manner, the charge-discharge electronic circuit comprises a sixth resistor, a second voltage regulator tube and a first capacitor,
one end of the sixth resistor is used for connecting a power supply end of the electronic device, the other end of the sixth resistor is connected with the first end of the first capacitor,
the cathode of the second voltage-regulator tube is used for connecting a power supply end of the electronic device, the anode of the second voltage-regulator tube is connected with the first end of the first capacitor,
and the second end of the first capacitor is connected with the common end.
In a second aspect, an embodiment of the present application provides an electronic device, where the electronic device includes any one of the shutdown reset circuits described above.
In one possible implementation, the electronic device has a supply terminal for receiving a supply voltage, the electronic device further comprising a voltage converter,
the input end of the voltage converter is connected with the power supply end, one output end of the voltage converter is connected with the detection end of the shutdown reset circuit,
the reset sub-circuit is connected with the input end of the voltage converter,
the shutdown reset circuit further comprises a charge-discharge electronic circuit, the charge-discharge electronic circuit is connected with the input end of the voltage converter, the charge-discharge electronic circuit is configured to be charged through the power supply voltage on the power supply end, and when the power supply end loses the supply of the power supply voltage, the charge-discharge electronic circuit supplies power to the power supply end of the electronic device by using the electric energy stored in the charge.
It can be seen that the shutdown reset circuit can conduct the detection end and the common end when the voltage value at the detection end is smaller than the voltage threshold, that is, the common end can be quickly set to zero by discharging when the voltage value at the power end of the electronic device drops to a certain degree, the time length that the electronic device is in an unstable intermediate state in the shutdown process is shortened, and the possibility that the electronic device suddenly recovers the power supply voltage supply in the unstable intermediate state is reduced, so that the problem that the electronic device is easily subjected to the abnormal situation that the electronic device cannot be started in the continuous startup and shutdown processes is solved, and the stability and the reliability of the electronic device are improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a block diagram of a shutdown reset circuit according to an embodiment of the present application;
fig. 2 is a circuit structure diagram of a shutdown detection sub-circuit according to an embodiment of the present disclosure;
FIG. 3 is a circuit diagram of a reset sub-circuit according to an embodiment of the present application;
FIG. 4 is a block diagram of an electronic device according to an embodiment of the present application;
fig. 5 is a circuit diagram of a charge/discharge electronic circuit according to an embodiment of the present application;
fig. 6 is a schematic diagram illustrating a reset effect of a shutdown reset circuit according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral connections; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Fig. 1 is a block diagram of a shutdown reset circuit according to an embodiment of the present application. Referring to fig. 1, the shutdown reset circuit has a detection terminal VDD, and the detection terminal is used for connecting a power supply terminal of an electronic device (a terminal of the electronic device for accessing a power supply voltage); the shutdown reset circuit includes a shutdown detection sub-circuit 110 and a reset sub-circuit 120. The shutdown detection sub-circuit 110 is respectively connected to the detection terminal VDD of the shutdown reset circuit and the reset sub-circuit 120, the shutdown detection sub-circuit 110 is configured to provide an enable signal to the reset sub-circuit 120 when a voltage value at the detection terminal VDD of the shutdown reset circuit is smaller than a voltage threshold, the reset sub-circuit 120 is configured to conduct the detection terminal VDD of the shutdown reset circuit to the common terminal GND of the electronic device and the shutdown reset circuit when receiving the enable signal from the shutdown detection sub-circuit 110, and the voltage threshold is smaller than a voltage value of a power voltage (such as a rated voltage of the electronic device) provided by the power supply terminal when the electronic device normally operates.
In an example of a shutdown process of an electronic device, a power supply terminal of the electronic device loses supply of a power supply voltage, and thereafter the voltage of the power supply terminal gradually decreases as an internal capacitance of the electronic device discharges. During this period, the electronic device will normally operate for a short period of time, and will be in an unstable intermediate state for the next period of time, and finally stop operating. If the supply of the power supply voltage is suddenly resumed while the electronic apparatus is in an unstable intermediate state, the electronic apparatus may have a certain possibility of internal errors or malfunctions, which are represented by abnormal situations such as a non-responsive dead halt state that cannot be started normally.
It can be seen that the shutdown reset circuit according to the embodiment of the present application can conduct the detection terminal and the common terminal when the voltage value at the detection terminal is smaller than the voltage threshold, that is, the common terminal can be quickly set to zero by discharging when the voltage value at the power terminal of the electronic device drops to a certain degree, so as to shorten the time period that the electronic device is in an unstable intermediate state during shutdown, and reduce the possibility of the electronic device suddenly resuming the supply of the power voltage in the unstable intermediate state, thereby helping to solve the problem that the electronic device is easily in an abnormal situation that the electronic device cannot be started during continuous startup and shutdown, and contributing to improving the stability and reliability of the electronic device.
In one example, the voltage threshold may be greater than a minimum voltage value of a power supply voltage supplied to the power supply terminal when the electronic device is capable of normal operation. Therefore, the time from the start of the electronic device failing to work normally to the complete stop of the electronic device in the shutdown process can be shortened as much as possible, and the stability and the reliability of the electronic device are further improved.
Fig. 2 is a circuit structure diagram of a shutdown detection sub-circuit 110 according to an embodiment of the present disclosure. Referring to fig. 2, the shutdown detection sub-circuit 110 includes a voltage dividing unit 111, a voltage stabilizing unit 112, and a comparing unit 113, wherein: the voltage dividing unit 111 is respectively connected to the detection terminal VDD of the shutdown reset circuit and the comparing unit 113, and is configured to provide a first voltage V1 obtained by dividing the voltage on the detection terminal VDD to the comparing unit 113; the voltage regulation unit 112 includes a voltage regulation element (taking the first voltage regulation tube D1 as an example), the voltage regulation unit 112 is connected to the comparison unit 113, the voltage regulation unit 112 is configured to provide the second voltage V2 obtained by using the voltage regulation element to the comparison unit 113; the comparing unit 113 is connected to the reset sub-circuit 120 and configured to provide an enable signal to the reset sub-circuit 120 when the first voltage V1 is less than the second voltage V2.
It can be seen that the voltage dividing unit 111 obtains the first voltage V1 (i.e. V1 is xV0, 0< x <1) based on the voltage (set as V0) at the detection end VDD by means of voltage division, and the voltage stabilizing unit 112 obtains the second voltage V2 (the value is determined by the voltage stabilizing element, 0< V2< V0) with a relatively stable relative voltage value through the voltage stabilizing element, so that during the process of the voltage dropping at the detection end VDD, V1 will gradually decrease with V0, while V2 will remain unchanged to some extent, so that the comparing unit 113 can provide the enable signal to the reset sub-circuit 120 when V1 drops to be less than V2, thereby implementing the function of the shutdown detection sub-circuit 110.
As an example, referring to fig. 2, the voltage dividing unit 111 may include a first resistor R1 and a second resistor R2 (in fig. 2, two portions of one variable resistor are respectively used as the first resistor R1 and the second resistor R2), the voltage stabilizing unit 112 may include a third resistor R3 and a first regulator tube D1, and the comparing unit 113 may include an operational amplifier OP 1. In terms of connection, one end of the first resistor R1 is connected to the detection terminal VDD of the shutdown reset circuit, and the other end of the first resistor R1 is connected to the non-inverting detection terminal of the operational amplifier OP 1; one end of the second resistor R2 is connected to the positive detection end of the operational amplifier OP1, and the other end of the second resistor R2 is connected to the common terminal GND; one end of the third resistor R3 is connected to the detection end VDD of the shutdown reset circuit, and the other end of the third resistor R3 is connected to the inverted detection end of the operational amplifier OP 1; the negative electrode of the first voltage-regulator tube D1 is connected with the inverting detection end of the operational amplifier OP1, the positive electrode of the first voltage-regulator tube D1 is connected with the common end GND, and the output end of the operational amplifier is connected with the enable signal output end EN which is used for being connected with the reset sub-circuit 120.
In this way, the ratio of the resistance values between the first resistor R1 and the second resistor R2 in the voltage dividing unit 111 determines the magnitude of x, i.e., the first voltage V1 obtained by dividing the voltage at the detection terminal VDD is realized. The first regulator tube D1 in the regulator unit 112 can maintain the stability of the voltage across the two terminals within a certain range, so as to achieve the above-mentioned second voltage V2 obtained based on the regulator component. The operational amplifier OP1 in the comparing unit 113 is capable of outputting a high-level voltage (not greater than V0) when V1 is greater than V2 and outputting a low-level voltage when V1 is less than V2, thereby supplying the low-level voltage as an enable signal to the reset sub-circuit 120 through the enable signal output terminal EN when V1 is less than V2.
Fig. 3 is a circuit diagram of a reset sub-circuit 120 according to an embodiment of the present application. Referring to fig. 3, the reset sub-circuit 120 includes a first switching unit 121 and a second switching unit 122, wherein: the first switch unit 121 is respectively connected to the shutdown detection sub-circuit 110 and the second switch unit 122, and configured to provide an on signal to the second switch unit 122 when receiving an enable signal from the shutdown detection sub-circuit 110; the second switching unit 122 is connected to the common terminal GND, the second switching unit 122 is connected to the input terminal VDD of the power-off reset circuit, and the second switching unit 122 is configured to turn on the power terminal of the electronic device to the common terminal GND when receiving the turn-on signal from the first switching unit 121.
It can be seen that the first switch unit 121 can provide the turn-on signal to the second switch unit 122 when receiving the enable signal from the shutdown detection sub-circuit 110, so that the second switch unit 122 receiving the turn-on signal turns on the power supply terminal of the electronic device to the common terminal GND, thereby implementing the function of the reset sub-circuit 120 described above.
As an example, referring to fig. 3, the first switching unit 121 may include a first transistor Q1 and a fourth resistor R4, and the second switching unit 122 may include a second transistor Q2. The gate of the first transistor Q1 is connected to the enable signal output terminal EN of the shutdown detection sub-circuit 110, the first pole of the first transistor Q1 is connected to the gate of the second transistor Q2, and the second pole of the first transistor Q1 is connected to the common terminal GND; one end of the fourth resistor R4 is connected to the power supply terminal of the electronic device through the connection input terminal VDD, and the other end of the fourth resistor R4 is connected to the gate of the second transistor Q2; a first pole of the second transistor Q2 is connected to a power supply terminal of the electronic device via a connection input terminal VDD, and a second pole of the second transistor Q2 is connected to the common terminal GND. The first pole is a drain electrode, and the second pole is a source electrode; in yet another example, the first pole is a source and the second pole is a drain. The first Transistor Q1 may be an N-type bipolar Transistor, for example, and the second Transistor Q2 may be an N-type MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor), for example.
Thus, when the operational amplifier OP1 outputs the enable signal of low level, the first transistor Q1 is turned off, so that the input terminal VDD charges the gate of the second transistor Q2; the second transistor Q2 turns on after the gate voltage exceeds its threshold voltage, so that the input terminal VDD is quickly discharged to the common terminal GND through the second transistor Q2, thereby allowing the voltage value at the input terminal VDD to be quickly set to zero. When the operational amplifier OP1 outputs a high-level voltage, the first transistor Q1 operates in a saturation region or a linear region, so that the gate voltage of the second transistor Q2 is obtained by dividing the voltage at the input terminal VDD by the equivalent resistance of the fourth resistor R4 and the first transistor Q1, and thus a low-level voltage close to zero is obtained when the resistance value of the fourth resistor R4 is much larger than the equivalent resistance of the first transistor Q1, so that the second transistor Q2 is in an off state. Of course, in order to increase the speed of discharging the input terminal VDD to the common terminal GND through the second transistor Q2, the second transistor Q2 may be implemented by a large-sized transistor with high voltage and high power. In addition, as an example, the reset sub-circuit 120 in fig. 3 further includes a fifth resistor R5, and the first pole of the second transistor Q2 is further connected to the input terminal VDD through two ends of the fifth resistor R5. The fifth resistor R5 may function to protect the second transistor Q2.
Based on the same inventive concept, the embodiment of the present application provides an electronic device including any one of the shutdown reset circuits described above. In one example, the electronic device may be, for example, any one of the electronic apparatuses described above. It should be noted that the electronic device described above may be any device that may be related to the above-mentioned problem that the abnormal situation that cannot be started easily occurs during the continuous power on and power off process, such as a chip, a circuit board, an electrical device, a switch, a socket, a timer, a mobile terminal, a wearable device, or a component of any one of them, and so on. By adding any one of the shutdown reset circuits in the electronic device, the common terminal can be quickly set to zero by discharging when the voltage value of the power terminal of the electronic device is reduced to a certain degree, the time for the electronic device to be in an unstable intermediate state in the shutdown process is shortened, and the possibility of the electronic device to suddenly recover the power supply voltage supply under the unstable intermediate state is reduced, so that the problem that the electronic device is easy to have abnormal conditions of incapability of starting in the continuous startup and shutdown processes is solved, and the stability and the reliability of the electronic device are improved.
As an example, fig. 4 is a block diagram of an electronic device in an embodiment of the present application. Referring to fig. 4, the electronic device has a power supply terminal VCC for receiving a power supply voltage, and includes a shutdown reset circuit (including a shutdown detection sub-circuit 110, a reset sub-circuit 120, and a charge-discharge sub-circuit 130) and a voltage converter 200. Of course, the structure shown in fig. 4 may be, for example, a partial component of a power management module in an electronic device, and the electronic device may further include a component other than the power management module.
The input end of the voltage converter 200 is connected to the power supply terminal VCC, and one output end of the voltage converter 200 is connected to the detection terminal VDD which is connected to the shutdown reset circuit through the RC circuit. In one example, the supply voltage for access by the supply terminal VCC is an alternating voltage, which needs to be converted into at least one direct current operating voltage for internal use by the voltage converter 200. The detection terminal VDD is connected to a working voltage (with a voltage value of V0) output by the voltage converter 200. The RC circuit can play a role in filtering and maintaining the voltage at the detection end VDD; in other examples, the RC circuit may be incorporated in the voltage converter 200, or may be included in the shutdown reset circuit.
The shutdown detection sub-circuit 110 is respectively connected to the detection terminal VDD, the reset sub-circuit 120 and the common terminal GND, and the shutdown detection sub-circuit 110 is configured to provide an enable signal to the reset sub-circuit 120 when the voltage value of the detection terminal VDD is smaller than the voltage threshold. The reset sub-circuit 120 is respectively connected to the power terminal VCC, the shutdown detection sub-circuit 110 and the common terminal GND, and the reset sub-circuit 120 is configured to turn on the power terminal VCC to the common terminal GND when receiving the enable signal from the shutdown detection sub-circuit 110. It can be seen that the shutdown reset circuit including the shutdown detection sub-circuit 110 and the reset sub-circuit 120 can implement the following functions: when the voltage value at the detection end VDD is smaller than the voltage threshold value, the power supply end VCC is conducted with the common end GND, and the voltage value of the power supply end VCC of the electronic equipment can be quickly set to zero by discharging the common end GND when the voltage value of the power supply end VCC of the electronic equipment is reduced to a certain degree. Therefore, the time length that the electronic equipment is in an unstable intermediate state in the shutdown process can be shortened, the possibility that the electronic equipment suddenly recovers the power supply voltage supply in the unstable intermediate state is reduced, the problem that the electronic equipment is easy to start in the continuous startup and shutdown processes is solved, and the stability and the reliability of the electronic equipment are improved.
For example, the shutdown detection sub-circuit 110 may have a circuit structure as shown in fig. 2, and the reset sub-circuit 120 may have a circuit structure as shown in fig. 3 (in fig. 3, the terminal for connecting the detection terminal VDD is connected to the power terminal VCC instead). Of course, in other examples, for example, where the power supply terminal VCC and the detection terminal VDD are not required to be converted, the operation principle of the shutdown reset circuit may refer to the structure and the related description shown in fig. 1 to fig. 3, and will not be described herein again.
Referring to fig. 4, the charge-discharge electronic circuit 130 is an optional structure in the shutdown reset circuit, the charge-discharge electronic circuit 130 is configured to be connected to a power supply terminal of the electronic device (for example, to the power supply terminal VCC of the electronic device in fig. 4), and the charge-discharge electronic circuit 130 is configured to be charged by a power supply voltage on the power supply terminal and to supply power to the power supply terminal of the electronic device by using the electric energy stored in the charge when the power supply terminal loses the supply of the power supply voltage. Therefore, the charge-discharge electronic circuit 130 can utilize the electric energy stored in the charging process to supply power to the connected power source end in a short time when the electronic device or the electronic equipment is powered off, so as to maintain the normal operation of the electronic device or the electronic equipment.
As an example, fig. 5 is a circuit structure diagram of a charge and discharge electronic circuit in an embodiment of the present application. Referring to fig. 5, the charge/discharge electronic circuit 130 includes a sixth resistor R6, a second regulator tube D2, and a first capacitor C1, wherein one end of the sixth resistor R6 is connected to the power supply terminal VCC, the other end of the sixth resistor R6 is connected to the first end of the first capacitor C1 (the upper end of the first capacitor C1 in fig. 5), the negative electrode of the second regulator tube D2 is connected to the power supply terminal VCC, the positive electrode of the second regulator tube D2 is connected to the first end of the first capacitor C1, and the second end of the first capacitor (the lower end of the first capacitor C1 in fig. 5) is connected to the common terminal GND.
Fig. 6 is a schematic diagram illustrating a reset effect of a shutdown reset circuit according to an embodiment of the present application. Fig. 6 shows the voltage change at the detection terminal VDD during power-on and power-off.
Referring to fig. 2, 3, 4, 5 and 6, at a first time t1, the power source terminal VCC is supplied with a power supply voltage, and at this time, the second voltage regulator D2 in the charge-discharge electronic circuit 130 may form a large current to charge the first capacitor C1 by using its own voltage regulation characteristic, so that the voltage at the power source terminal VCC is quickly raised to the power supply voltage, and meanwhile, the voltage converter 200 may also pull up the detection terminal VDD to the operating voltage (the voltage V0) in a very short time based on the voltage quickly raised at the power source terminal VCC, so as to form a rising edge at the first time t1 in fig. 6.
At the second time t2, the supply of the power voltage at the voltage terminal VCC stops, and at this time, the first capacitor C1 in the charge-discharge electronic circuit 130 starts to discharge to supply the power to the power terminal VCC, but the voltage at the voltage terminal VCC will continue to drop in a short time, so that the operating voltage at the detection terminal VDD generated based on the voltage at the power terminal VCC will also continue to drop, forming a voltage drop stage between the first time t1 and the second time t2 in fig. 6.
At the third time t3, the operating voltage at the detection terminal VDD drops to a certain extent, so that the condition that the first voltage value V1 obtained by dividing the operating voltage is smaller than the relatively stable second voltage value V2 obtained by dividing the operating voltage by the voltage stabilizing element is satisfied, and thus the level output from the operational amplifier OP1 to the gate of the first transistor Q1 changes from high level to low level, so that the second transistor Q2 is turned on, so that the power supply terminal VCC starts to rapidly discharge the common terminal GND, and the operating voltage at the detection terminal VDD generated by the voltage at the power supply terminal VCC is also rapidly set to zero, thereby forming a falling edge at the second time t2 in fig. 6.
Therefore, the embodiment of the application can shorten the time of the electronic equipment in an unstable intermediate state in the shutdown process, and reduce the possibility of the electronic equipment suddenly recovering the power supply voltage supply in the unstable intermediate state, thereby helping to solve the problem that the electronic equipment is easy to be in an abnormal condition of being incapable of being started in the continuous startup and shutdown processes, and being beneficial to improving the stability and the reliability of the electronic equipment.
In any of the above circuit configurations, any one of the resistors may be implemented by a plurality of resistors having a series structure and/or a parallel structure, and any one of the capacitors may be implemented by a plurality of capacitors having a series structure and/or a parallel structure.
Above-mentioned all optional technical scheme can adopt arbitrary combination to form the optional embodiment of this utility model, and the repeated description is no longer given here.
The above description is only an alternative embodiment of the present invention, and is not intended to limit the present invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (10)
1. A shutdown reset circuit for an electronic device having a power supply terminal for accessing a supply voltage, the shutdown reset circuit having a detection terminal for connecting the power supply terminal of the electronic device, the shutdown reset circuit comprising a shutdown detection sub-circuit and a reset sub-circuit;
the shutdown detection sub-circuit is respectively connected with the detection end and the reset sub-circuit, and the shutdown detection sub-circuit is configured to provide an enabling signal to the reset sub-circuit when the voltage value at the detection end is smaller than a voltage threshold value;
the reset sub-circuit is configured to conduct a power supply terminal of the electronic device to a common terminal of the electronic device and the shutdown reset circuit upon receiving the enable signal from the shutdown detection sub-circuit.
2. The shutdown reset circuit according to claim 1, wherein the voltage threshold is smaller than a voltage value of the power supply voltage supplied from the power supply terminal when the electronic apparatus is in normal operation and larger than a minimum voltage value of the power supply voltage supplied from the power supply terminal when the electronic apparatus is in normal operation; the shutdown detection sub-circuit comprises a voltage division unit, a voltage stabilization unit and a comparison unit; wherein,
the voltage dividing unit is respectively connected with the detection end and the comparison unit, and is configured to provide a first voltage obtained by dividing the voltage on the detection end to the comparison unit;
the voltage stabilizing unit comprises a voltage stabilizing element, is connected with the comparing unit and is configured to provide a second voltage obtained by the voltage stabilizing element to the comparing unit;
the comparison unit is connected with the reset sub-circuit and is configured to provide the enable signal to the reset sub-circuit when the first voltage is smaller than the second voltage.
3. The shutdown reset circuit according to claim 2, wherein the voltage dividing unit includes a first resistor and a second resistor, the voltage stabilizing unit includes a third resistor and a first voltage regulator tube, and the comparing unit includes an operational amplifier; wherein,
one end of the first resistor is connected with the detection end, and the other end of the first resistor is connected with the positive phase detection end of the operational amplifier;
one end of the second resistor is connected with the positive phase detection end of the operational amplifier, and the other end of the second resistor is connected with the common end;
one end of the third resistor is connected with the detection end, and the other end of the third resistor is connected with the inverted detection end of the operational amplifier;
the negative electrode of the first voltage-stabilizing tube is connected with the inverting detection end of the operational amplifier, and the positive electrode of the first voltage-stabilizing tube is connected with the common end;
the output end of the operational amplifier is connected with the reset sub-circuit.
4. The shutdown reset circuit of claim 1, wherein the reset sub-circuit comprises a first switching unit and a second switching unit; wherein,
the first switch unit is respectively connected with the shutdown detection sub-circuit and the second switch unit, and the first switch unit is configured to provide a turn-on signal to the second switch unit when receiving the enabling signal from the shutdown detection sub-circuit;
the second switch unit is connected to the common terminal, the second switch unit is used for connecting a power supply terminal of the electronic device, and the second switch unit is configured to conduct the power supply terminal of the electronic device to the common terminal when receiving the turn-on signal from the first switch unit.
5. The shutdown reset circuit of claim 4, wherein the first switching unit includes a first transistor and a fourth resistor, and the second switching unit includes a second transistor; wherein,
the grid electrode of the first transistor is connected with the shutdown detection sub-circuit, the first pole of the first transistor is connected with the grid electrode of the second transistor, and the second pole of the first transistor is connected with the common terminal;
one end of the fourth resistor is used for connecting a power supply end of the electronic device, and the other end of the fourth resistor is connected with the grid electrode of the second transistor;
the first pole of the second transistor is used for connecting a power supply end of the electronic device, and the second pole of the second transistor is connected with the common end;
wherein the first pole and the second pole are one of a source and a drain, respectively.
6. The shutdown reset circuit of claim 5, wherein the reset sub-circuit further comprises a fifth resistor, and the first pole of the second transistor is further configured to be connected to a power supply terminal of the electronic device via the fifth resistor.
7. The power-off reset circuit of claim 1, further comprising a charge-discharge electronic circuit for connecting to a power supply terminal of the electronic device, the charge-discharge electronic circuit being configured to be charged by a power supply voltage on the power supply terminal and to supply the power supply terminal of the electronic device with the electric energy stored by the charge when the power supply terminal loses supply of the power supply voltage.
8. The shutdown reset circuit of claim 7, wherein the charge-discharge electronic circuit comprises a sixth resistor, a second voltage regulator tube and a first capacitor; wherein,
one end of the sixth resistor is used for connecting a power supply end of the electronic device, and the other end of the sixth resistor is connected with the first end of the first capacitor;
the cathode of the second voltage-regulator tube is used for connecting a power supply end of the electronic device, and the anode of the second voltage-regulator tube is connected with the first end of the first capacitor;
and the second end of the first capacitor is connected with the common end.
9. An electronic device, characterized in that it comprises a power-off reset circuit as claimed in any one of claims 1 to 8.
10. The electronic device of claim 9, wherein the electronic device has a power supply terminal for accessing a power supply voltage, the electronic device further comprising a voltage converter; wherein,
the input end of the voltage converter is connected with the power supply end, and one output end of the voltage converter is connected with the detection end;
the reset sub-circuit is connected with the input end of the voltage converter;
the shutdown reset circuit further comprises a charge-discharge electronic circuit, the charge-discharge electronic circuit is connected with the input end of the voltage converter, the charge-discharge electronic circuit is configured to be charged through the power supply voltage on the power supply end, and when the power supply end loses the supply of the power supply voltage, the charge-discharge electronic circuit supplies power to the power supply end of the electronic device by using the electric energy stored in the charge.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021421378.6U CN212541261U (en) | 2020-07-17 | 2020-07-17 | Shutdown reset circuit and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021421378.6U CN212541261U (en) | 2020-07-17 | 2020-07-17 | Shutdown reset circuit and electronic equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112967692A (en) * | 2021-02-26 | 2021-06-15 | 惠科股份有限公司 | Ghost eliminating circuit and display device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112967692A (en) * | 2021-02-26 | 2021-06-15 | 惠科股份有限公司 | Ghost eliminating circuit and display device |
| WO2022179282A1 (en) * | 2021-02-26 | 2022-09-01 | 惠科股份有限公司 | Afterimage elimination circuit and display apparatus |
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