CN212649434U - Power switch circuit with watchdog function - Google Patents
Power switch circuit with watchdog function Download PDFInfo
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- CN212649434U CN212649434U CN202021717108.XU CN202021717108U CN212649434U CN 212649434 U CN212649434 U CN 212649434U CN 202021717108 U CN202021717108 U CN 202021717108U CN 212649434 U CN212649434 U CN 212649434U
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Abstract
The embodiment of the application discloses a power switch circuit with a watchdog function. The technical scheme provided by the embodiment of the application is that when the system works abnormally and cannot normally send a feeding dog signal, the feeding dog response module cannot timely reset the accumulated conduction time of the delay resetting module, so that the conduction time of the delay resetting module reaches the delay time, the switch enabling module is informed to control the power switch module to reset, the power input interface and the power output interface are disconnected, the supply of a power supply is cut off, the system is powered off and restarted, the switch enabling module controls the power switch module to switch on the power input interface and the power output interface again, the function of the watchdog is realized, the delay time can be set through the delay resetting circuit, the timing time of the watchdog is flexibly set, and the flexibility of the watchdog is improved.
Description
Technical Field
The embodiment of the application relates to the field of power switch circuits, in particular to a power switch circuit with a watchdog function.
Background
At present, the watchdog function is realized on a common circuit by chip control, and after a software problem and program run-off occur, a chip with the watchdog is restarted by a system generally has an input and an output, wherein the input is called a feeding dog, and the output is generally connected to the reset end of the other part, generally connected to a single chip microcomputer and the like.
The watchdog functions to periodically check program execution and to signal a restart to the system in the event of an error. When the system works normally, the timing time of the watchdog can not reach the preset time by the watchdog feeding instruction, the system can not reset and works normally, and when the system runs and cannot capture a program, the timing time of the watchdog is quickly increased to the preset time to force the system to reset.
However, the timing time of this type of watchdog is greatly limited by the chip, and the timing time is determined according to the chip, so that the watchdog is inconvenient to use.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides a take switch circuit of watchdog function to according to user demand carry out nimble setting to the timing length of watchdog, improve the flexibility of watchdog.
The embodiment of the application provides a power switch circuit with a watchdog function, which comprises a power switch module, a switch enabling module, a time delay resetting module, a resetting execution module and a dog feeding response module, wherein:
the power supply switch module is used for connecting a power supply input interface and a power supply output interface and controlling the on-off between the power supply input interface and the power supply output interface;
the switch enabling module is electrically connected to the power input interface and the power switch module, and is used for responding to the access of a power supply of the power input interface for a preset time length and controlling the power switch module to conduct the power input interface and the power output interface;
the delay reset module is electrically connected with the power supply output interface and the reset execution module, the reset execution module is electrically connected with the switch enabling module, the delay reset module accumulates the conduction time of the power supply input interface and the power supply output interface, and informs the reset execution module to control the reset of the power supply switch module when the conduction time reaches the delay time so as to enable the power supply switch module to disconnect the power supply input interface and the power supply output interface;
the dog feeding response module is electrically connected with the delay reset module and responds to a dog feeding signal to reset the conduction time of the delay reset module.
Furthermore, the power switch module includes a first switch tube, the first switch tube has a first connection end, a second connection end and a control end, the first connection end and the second connection end of the first switch tube are respectively electrically connected to the power input interface and the power output interface, the control end of the first switch tube is electrically connected to the switch enabling module, and the switch enabling module controls on/off between the first connection end and the second connection end of the first switch tube through the control end of the first switch tube.
Furthermore, the switch enabling module includes a first resistor, a first capacitor and a second switch tube, one end of the first capacitor is grounded, the other end of the first capacitor is electrically connected to the power input interface through the first resistor, the second switch tube has a first connection end, a second connection end and a control end, the first connection end and the second connection end of the second switch tube are respectively connected to the control end of the first switch tube and grounded, and the control end of the second switch tube is electrically connected to the common connection end of the first resistor and the first capacitor.
Furthermore, the time delay reset module comprises a second resistor and a second capacitor, one end of the second capacitor is grounded, the other end of the second capacitor is connected with the power output interface through the second resistor, and the reset execution module is connected to the common connection end of the second resistor and the second capacitor.
Furthermore, the reset delay module further comprises a third resistor and a first diode, a cathode of the first diode is electrically connected to the power output interface, and an anode of the first diode is connected to a common connection end of the second resistor and the second capacitor through the third resistor.
Furthermore, the reset execution module includes a third switching tube, the third switching tube has a first connection end, a second connection end and a control end, the control end of the third switching tube is connected to the common connection end of the second resistor and the second capacitor, and the first connection end and the second connection end of the third switching tube are respectively connected to the control end of the second switching tube and the ground.
Furthermore, the dog feeding response module comprises a fourth switch tube, the fourth switch tube has a first connection end, a second connection end and a control end, the first connection end and the second connection end of the fourth switch tube are respectively connected to the common connection end of the second resistor and the second capacitor and grounded, and the control end of the fourth switch tube is used for receiving a dog feeding signal.
Furthermore, the dog feeding response module further comprises a third capacitor, a control end of the fourth switch tube is connected to one end of the third capacitor, and the other end of the third capacitor is used for receiving a dog feeding signal.
Furthermore, the dog feeding response module further comprises a fourth resistor, and two ends of the fourth resistor are respectively connected with the control end of the fourth switch tube and the ground.
Furthermore, the dog feeding response module further comprises a second diode, an anode of the second diode is grounded, and a cathode of the second diode is connected with the control end of the fourth switching tube.
In the embodiment of the application, the power switch module is controlled by the switch enabling module when the power input interface is connected with a power supply, so that the power switch module conducts the power input interface and the power output interface, the power supply supplies power to the system through the power output interface, meanwhile, the delay resetting module accumulates the conduction time of the power input interface and the power output interface, when the system normally works, the feeding dog response module is sent with a feeding dog signal at regular time, so that the feeding dog response module resets the accumulated conduction time of the delay resetting module, when the system abnormally works and the feeding dog signal cannot be normally sent, the feeding dog response module cannot timely reset the accumulated conduction time of the delay resetting module, so that when the conduction time of the delay resetting module reaches the delay time, the switch enabling module is informed to control the power switch module to reset, and the power input interface and the power output interface are disconnected, the power supply is cut off, the system is powered off and restarted, the switch enabling module controls the power switch module to be switched on the power input interface and the power output interface again, the function of the watchdog is achieved, time delay can be set through the time delay reset circuit, time timing of the watchdog is flexibly set, and flexibility of the watchdog is improved.
Drawings
Fig. 1 is a block diagram of a power switch circuit with a watchdog function according to an embodiment of the present disclosure;
fig. 2 is a schematic circuit diagram of a power switch circuit with a watchdog function according to an embodiment of the present application.
Reference numerals: 1. a power switch module; 2. a switch enable module; 3. a delay reset module; 4. a reset execution module; 5. a feeding dog response module; 6. a power input interface; 7. a power output interface; 8. a first switch tube; 9. a first resistor; 10. a first capacitor; 11. a second switching tube; 12. a second resistor; 13. a second capacitor; 14. a third resistor; 15. a first diode; 16. a third switching tube; 17. a fourth switching tube; 18. a third capacitor; 19. a fourth resistor; 20. a second diode; 21. and a fifth resistor.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, specific embodiments of the present application will be described in detail with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be further noted that, for the convenience of description, only some but not all of the relevant portions of the present application are shown in the drawings.
In the description of the embodiments of the present application, unless explicitly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Fig. 1 shows a block diagram of a power switch circuit with a watchdog function according to an embodiment of the present disclosure, and as shown in fig. 1, the power switch provided in this embodiment includes a power switch module 1, a switch enabling module 2, a delay resetting module 3, a resetting execution module 4, and a dog feeding response module 5.
The power switch module 1 is configured to introduce a power input interface 6(VCC _ IN) and provide a power output interface 7(VCC _ OUT), that is, the power switch module 1 is configured to connect the power input interface 6 and the power output interface 7, and the power switch module 1 is controlled by the switch enabling module 2 to control on/off between the power input interface 6 and the power output interface 7.
The power output interface 7 is used for accessing a power supply (such as an external 5V, 12V, 24V power supply), and the power output interface 7 is used for supplying power to a system (such as a single chip microcomputer). It will be appreciated that when the power switch module 1 is switched on the power input interface 6 and the power output interface 7, the power supply supplies power to the power output interface 7 via the power switch module 1.
Further, the switch enabling module 2 is electrically connected to the power input interface 6 and the power switch module 1, and the switch enabling module 2 is configured to respond to that the access of the power supply of the power input interface 6 reaches a preset duration, and control the power switch module 1 to turn on the power input interface 6 and the power output interface 7.
The delay reset module 3 is electrically connected to the power output interface 7 and the reset execution module 4, and the reset execution module 4 is electrically connected to the switch enabling module 2. The delay resetting module 3 accumulates the conduction time of the power input interface 6 and the power output interface 7, and informs the resetting execution module 4 to control the power switch module 1 to reset when the conduction time reaches the set delay time. The reset execution module 4 controls the switch enabling module 2 to reset to disconnect the power input interface 6 and the power output interface 7 when receiving the reset notification of the delay reset module 3.
The feeding dog response module 5 is electrically connected to the delay reset module 3, and the feeding dog response module 5 is used for accessing a feeding dog signal output interface (WDI) of the system. The system sends a dog feeding signal to the delay resetting module 3 provided by this embodiment through the dog feeding signal output interface at a set time, so that the delay resetting module 3 resets the on-time of the delay resetting module 3 in response to the dog feeding signal.
It can be understood that, when the power input interface 6 is connected to the power supply, the switch enabling module 2 detects the connection of the power supply, and controls the power switch module 1 to conduct the power input interface 6 and the power output interface 7 when the power supply is connected to the power supply for a preset time, and the power supply supplies power to the system from the power output interface 7.
In the normal working process of the system, the system sends a dog feeding signal to the delay resetting module 3 through the dog feeding signal output interface at a set time interval (the set time interval should be smaller than the delay time duration) to control the delay resetting module 3 to reset the accumulated conduction time duration (namely, clear the conduction time duration), the delay resetting module 3 accumulates the conduction time durations of the power input interface 6 and the power output interface 7 again, and at the moment, the power switch module 1 keeps the conduction of the power input interface 6 and the power output interface 7, so that stable power supply is realized.
When the system works abnormally (for example, the system is halted or the program runs off), the system cannot normally output the dog feeding signal until the on-time reaches (is greater than or equal to) the delay time, the delay resetting module 3 informs the resetting execution module 4 to reset the switch enabling circuit, and the power input interface 6 and the power output interface 7 are disconnected to cut off the power supply of the power supply to the system, so that the system is powered off and shut down. And then the switch enabling module 2 controls the power switch module 1 to conduct the power input interface 6 and the power output interface 7 again, the circulation is restarted, the system is powered on and started, the fault restart of the system is realized, and the function of the watchdog is realized.
It can be understood that the preset time of the switch enabling module 2 and the delay time of the delay resetting module 3 are set, the time length of the power output interface 7 with output and without output can be adjusted, the timing time of the watchdog can be adjusted randomly according to the system requirements, the requirement of the watchdog timing time of the system is met, and the use is flexible.
Fig. 2 is a schematic circuit diagram of a power switch circuit with a watchdog function according to an embodiment of the present application. As shown in fig. 2, specifically, on the basis of fig. 1, the power switch module 1 includes a first switch tube 8 (Q1 in the figure) and a fifth resistor 21 (R5 in the figure), and the first switch tube 8 has a first connection end, a second connection end and a control end.
The first connection end and the second connection end of the first switch tube 8 are electrically connected to the power input interface 6 and the power output interface 7 respectively, the control end of the first switch tube 8 is electrically connected to the switch enabling module 2, and the switch enabling module 2 controls on-off between the first connection end and the second connection end of the first switch tube 8 through the control end of the first switch tube 8.
Specifically, in this embodiment, a PMOS transistor is used as the first switch transistor 8, wherein a first connection end, a second connection end, and a control end of the first switch transistor 8 are respectively a source, a drain, and a gate of the PMOS transistor, the source of the first switch transistor 8 is electrically connected to the power input interface 6, the drain is electrically connected to the power output interface 7, and two ends of the fifth resistor 21 are respectively electrically connected to the source and the gate of the first switch transistor 8.
The switch enabling module 2 includes a first resistor 9 (R1 in the figure), a first capacitor 10 (C1 in the figure), and a second switch tube 11 (Q2 in the figure). One end of the first capacitor 10 is grounded, and the other end is electrically connected to the power input interface 6 through the first resistor 9. The second switch tube 11 has a first connection end, a second connection end and a control end, the first connection end and the second connection end of the second switch tube 11 are respectively connected to the control end of the first switch tube 8 and the ground, and the control end of the second switch tube 11 is electrically connected to the common connection end of the first resistor 9 and the first capacitor 10.
Specifically, in this embodiment, an NPN-type triode is used as the second switching tube 11, wherein the first connection end, the second connection end, and the control end of the second switching tube 11 are respectively a collector, an emitter, and a base of the NPN-type triode, that is, the collector of the second switching tube 11 is electrically connected to the gate of the first switching tube 8, the emitter is grounded, and the base is electrically connected to the common connection end of the first resistor 9 and the first capacitor 10.
Further, the delay reset circuit provided by the present embodiment includes a second resistor 12 (R2 in the figure), a second capacitor 13 (C2 in the figure), a third resistor 14 (R3 in the figure), and a first diode 15 (D1 in the figure). One end of the second capacitor 13 is grounded, the other end of the second capacitor is connected with the power output interface 7 through the second resistor 12, the common connection end of the second resistor 12 and the second capacitor 13 is electrically connected with the reset execution module 4, the cathode of the first diode 15 is electrically connected with the power output interface 7, and the anode of the first diode is connected with the common connection end of the second resistor 12 and the second capacitor 13 through the third resistor 14.
The reset performing module 4 is specifically a third switching tube 16 (Q3 in the figure), the third switching tube 16 has a first connection end, a second connection end and a control end, and the present embodiment adopts an NPN-type transistor as the third switching tube 16, where the first connection end, the second connection end and the control end of the third switching tube 16 are a collector, an emitter and a base of the NPN-type transistor, respectively. A control end (base) of the third switching tube 16 is electrically connected to a common connection end of the second resistor 12 and the second capacitor 13, and a first connection end (collector) and a second connection end (emitter) of the third switching tube 16 are electrically connected to the base and the ground of the second switching tube 11, respectively.
Further, the feeding dog response module 5 provided by the present embodiment includes a fourth switch tube 17 (Q4 in the figure), a third capacitor 18 (C3 in the figure), a fourth resistor 19 (R4 in the figure), and a second diode 20 (D2 in the figure). The fourth switching tube 17 has a first connection end, a second connection end and a control end, and in this embodiment, an NMOS tube is used as the fourth switching tube 17, wherein a drain, a source and a gate of the NMOS tube are respectively used as the fourth switching tube 17 and have the first connection end, the second connection end and the control end.
Specifically, a first connection end of the fourth switch tube 17 is electrically connected to a common connection end of the second resistor 12 and the second capacitor 13, the second connection end is grounded, a control end is electrically connected to one end of the third capacitor 18, the other end of the third capacitor 18 is used for receiving a dog feeding signal (WDI), two ends of the fourth resistor 19 are respectively connected to the control end of the fourth switch tube 17 and grounded, an anode of the second diode 20 is grounded, and a cathode of the fourth switch tube 17 is connected to the control end of the fourth switch tube 17.
The dog feeding signal sent by the system is generally an alternating signal, and is used for preventing the situation that the fourth switch tube 17 is always conducted due to the fact that the dog feeding signal output interface always outputs a high-level signal because the system fails, and only allowing the alternating dog feeding signal to pass through, so that the fourth switch tube 17 is instantly conducted to discharge the second capacitor 13. The fourth resistor 19 is used to ensure that when the dog feeding signal is not received, the potential of the gate of the fourth switching tube 17 is pulled down, and the fourth switching tube 17 is ensured to be turned off. The second diode 20 is used to provide a fast current path for rapidly turning off the fourth switching tube 17 when the alternating signal passes through the third capacitor 18.
Further, in general, the resistance of the second resistor 12 is greater than the resistance of the third resistor 14, the second capacitor 13 is charged through the second resistor 12, and when the first switch tube 8 and the fourth switch tube 17 are both turned off, the residual voltage of the second capacitor 13 is mainly discharged through the third resistor 14 and the first diode 15, so as to increase the discharging speed.
It can be understood that, at the moment that the power input interface 6 is connected to the power supply VCC _ IN, the first switch tube 8, the second switch tube 11, the third switch tube 16 and the fourth switch tube 17 are all turned off IN a state that the feeding dog signal is stable and has no transition (default low level). The power supply charges the first capacitor 10 through the first resistor 9, and VCC _ OUT output by the power output interface 7 is at a low level before the first capacitor 10 reaches the turn-on voltage of the second switch tube 11. When the second capacitor 13 is charged to reach the turn-on voltage of the second switch tube 11 (i.e. after a preset time period), the second switch tube 11 is turned on, the gate voltage of the first switch tube 8 is pulled down, the first switch tube 8 is turned on, and the power output interface 7 outputs a high level to supply power to the system.
Meanwhile, the power supply charges the second capacitor 13 through the second resistor 12 (the time for charging the second capacitor 13 is the on-time), and the third switching tube 16 is kept closed before the second capacitor 13 reaches the turn-on voltage of the third switching tube 16.
In the normal working process of the system, the system sends a dog feeding signal to the delay resetting module 3 through the dog feeding signal output interface at a set time interval (the set time interval should be less than the delay time duration), the fourth switch tube 17 is switched on at the moment of receiving the dog feeding signal, the second capacitor 13 discharges to the ground wire through the fourth switch tube 17 (which is equivalent to clearing the switching-on time duration), the power supply continues to charge the second capacitor 13 through the second resistor 12, at this time, the first switch tube 8 continues to be switched on, and stable power supply is realized.
When the system is in abnormal operation (for example, the system is halted or the program runs off), and the system cannot normally output the dog feeding signal, the power supply continues to charge the second capacitor 13 through the second resistor 12 until the second capacitor 13 reaches the start voltage of the third switching tube 16 (that is, the conduction time reaches the delay time), the third switching tube 16 is turned on, the electric quantity of the first capacitor 10 is discharged to the ground wire, the base voltage of the second switching tube 11 is pulled down, and the second switching tube 11 is turned off. The cut-off of the second switch tube 11 will cause the grid voltage of the first switch tube 8 to increase, which causes the cut-off of the first switch tube 8, the power output interface 7 outputs low level, and the system is powered off.
After the high level output by the power output interface 7 is changed into the low level, the second capacitor 13 is discharged through the second resistor 12, the third resistor 14 and the first diode 15, after the electric quantity of the second capacitor 13 is discharged to be lower than the starting voltage of the third switch tube 16, the third switch tube 16 is cut off, at the moment, the first capacitor 10 is continuously charged through the first resistor 9, the process when the power supply is accessed in common is realized again, the system is powered on, the fault restart of the system is realized, the watchdog function is realized, and the cycle is performed.
The charging time of the capacitor is controlled by adjusting the parameters of the first resistor 9, the first capacitor 10, the second resistor 12 and the second capacitor 13, and further the preset time and the delay time are controlled, so that the timing time of the watchdog can be adjusted randomly according to the system requirements, the adjustment requirement of the timing time of the watchdog of the system is met, and the use is flexible.
The power switch module 1 is controlled by the switch enabling module 2 when the power input interface 6 is connected with a power supply, so that the power switch module 1 conducts the power input interface 6 and the power output interface 7, the power supply supplies power to the system through the power output interface 7, meanwhile, the delay resetting module 3 accumulates the conduction duration of the power input interface 6 and the power output interface 7, when the system normally works, a feeding dog signal is sent to the feeding dog response module 5 at regular time, so that the feeding dog response module 5 resets the accumulated conduction duration of the delay resetting module 3, when the system works abnormally and the feeding dog signal cannot be sent normally, the feeding dog response module 5 cannot reset the accumulated conduction duration of the delay resetting module 3 in time, so that the delay resetting module 3 informs the switch enabling module 2 to control the power switch module 1 to reset when the conduction duration reaches the delay duration, the power input interface 6 and the power output interface 7 are disconnected, the supply of a power supply is cut off, the system is powered off and restarted, the switch enabling module 2 controls the power switch module 1 to be connected with the power input interface 6 and the power output interface 7 again, the watchdog function is realized, and the time delay can be set through the time delay reset circuit, so that the time of timing of the watchdog is flexibly set, and the flexibility of the watchdog is improved.
The foregoing is considered as illustrative of the preferred embodiments of the invention and the technical principles employed. The present application is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present application has been described in more detail with reference to the above embodiments, the present application is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present application, and the scope of the present application is determined by the scope of the claims.
Claims (10)
1. The utility model provides a take power switch circuit of watchdog function which characterized in that, includes power switch module (1), switch enable module (2), time delay reset module (3), execution module (4) and feed dog response module (5) that reset, wherein:
the power switch module (1) is used for connecting a power input interface (6) and a power output interface (7) and controlling the connection and disconnection between the power input interface (6) and the power output interface (7);
the switch enabling module (2) is electrically connected to the power input interface (6) and the power switch module (1), and the switch enabling module (2) is used for responding to the condition that the access of a power supply of the power input interface (6) reaches a preset time length and controlling the power switch module (1) to conduct the power input interface (6) and the power output interface (7);
the delay reset module (3) is electrically connected to the power output interface (7) and the reset execution module (4), the reset execution module (4) is electrically connected to the switch enabling module (2), the delay reset module (3) accumulates the conduction time of the power input interface (6) and the power output interface (7), and informs the reset execution module (4) to control the power switch module (1) to reset when the conduction time reaches the delay time, so that the power switch module (1) disconnects the power input interface (6) and the power output interface (7);
the dog feeding response module (5) is electrically connected with the delay reset module (3), and the dog feeding response module (5) responds to a dog feeding signal to reset the conduction time of the delay reset module (3).
2. The power switch circuit with the watchdog function according to claim 1, wherein the power switch module (1) includes a first switch tube (8), the first switch tube (8) has a first connection end, a second connection end and a control end, the first connection end and the second connection end of the first switch tube (8) are electrically connected to the power input interface (6) and the power output interface (7), respectively, the control end of the first switch tube (8) is electrically connected to the switch enabling module (2), and the switch enabling module (2) controls on/off between the first connection end and the second connection end of the first switch tube (8) through the control end of the first switch tube (8).
3. The power switch circuit with watchdog function according to claim 2, wherein the switch enable module (2) includes a first resistor (9), a first capacitor (10), and a second switch tube (11), one end of the first capacitor (10) is connected to ground, the other end is electrically connected to the power input interface (6) via the first resistor (9), the second switch tube (11) has a first connection end, a second connection end, and a control end, the first connection end and the second connection end of the second switch tube (11) are respectively connected to the control end of the first switch tube (8) and ground, and the control end of the second switch tube (11) is electrically connected to the common connection end of the first resistor (9) and the first capacitor (10).
4. The power switch circuit with watchdog function according to claim 3, wherein the delay reset module (3) includes a second resistor (12) and a second capacitor (13), one end of the second capacitor (13) is connected to ground, the other end of the second capacitor (13) is connected to the power output interface (7) via the second resistor (12), and the reset execution module (4) is connected to a common connection end of the second resistor (12) and the second capacitor (13).
5. The power switch circuit with watchdog function of claim 4, wherein the reset delay module further comprises a third resistor (14) and a first diode (15), wherein a cathode of the first diode (15) is electrically connected to the power output interface (7), and an anode of the first diode is connected to a common connection terminal of the second resistor (12) and the second capacitor (13) through the third resistor (14).
6. The power switch circuit with watchdog function according to claim 4, wherein the reset execution module (4) comprises a third switch tube (16), the third switch tube (16) has a first connection end, a second connection end and a control end, the control end of the third switch tube (16) is connected to the common connection end of the second resistor (12) and the second capacitor (13), and the first connection end and the second connection end of the third switch tube (16) are respectively connected to the control end of the second switch tube (11) and the ground.
7. The power switch circuit with watchdog function according to claim 6, wherein the feeding dog response module (5) comprises a fourth switch tube (17), the fourth switch tube (17) has a first connection end, a second connection end and a control end, the first connection end and the second connection end of the fourth switch tube (17) are respectively connected to the common connection end of the second resistor (12) and the second capacitor (13) and the ground, and the control end of the fourth switch tube (17) is configured to receive a feeding dog signal.
8. The power switch circuit with watchdog function of claim 7, wherein the feeding dog response module (5) further comprises a third capacitor (18), a control terminal of the fourth switch tube (17) is connected to one terminal of the third capacitor (18), and the other terminal of the third capacitor (18) is used for receiving a feeding dog signal.
9. The power switch circuit with watchdog function of claim 8, wherein the feeding dog response module (5) further comprises a fourth resistor (19), and two ends of the fourth resistor (19) are respectively connected to the control end of the fourth switch tube (17) and the ground.
10. The power switch circuit with watchdog function of claim 8, wherein the feeding dog response module (5) further comprises a second diode (20), an anode of the second diode (20) is grounded, and a cathode of the second diode is connected to the control terminal of the fourth switch tube (17).
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| CN202021717108.XU CN212649434U (en) | 2020-08-17 | 2020-08-17 | Power switch circuit with watchdog function |
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| CN202021717108.XU CN212649434U (en) | 2020-08-17 | 2020-08-17 | Power switch circuit with watchdog function |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113821070A (en) * | 2021-08-20 | 2021-12-21 | 浙江大华技术股份有限公司 | Power supply control system, method, computer equipment and storage medium |
| CN115242234A (en) * | 2022-08-09 | 2022-10-25 | 山东思科赛德矿业安全工程有限公司 | Single chip microcomputer system restarting circuit and method |
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2020
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113821070A (en) * | 2021-08-20 | 2021-12-21 | 浙江大华技术股份有限公司 | Power supply control system, method, computer equipment and storage medium |
| CN113821070B (en) * | 2021-08-20 | 2022-12-20 | 浙江大华技术股份有限公司 | Power supply control system, method, computer equipment and storage medium |
| CN115242234A (en) * | 2022-08-09 | 2022-10-25 | 山东思科赛德矿业安全工程有限公司 | Single chip microcomputer system restarting circuit and method |
| CN115242234B (en) * | 2022-08-09 | 2023-05-12 | 山东思科赛德矿业安全工程有限公司 | Singlechip system restarting circuit and method |
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