CN211506404U - Power supply control circuit - Google Patents
Power supply control circuit Download PDFInfo
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- CN211506404U CN211506404U CN202020090421.9U CN202020090421U CN211506404U CN 211506404 U CN211506404 U CN 211506404U CN 202020090421 U CN202020090421 U CN 202020090421U CN 211506404 U CN211506404 U CN 211506404U
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Abstract
The utility model discloses a power supply control circuit, power supply control circuit includes feedback circuit, first control element, second control element, reset circuit, first power supply, second control element receives during the unchangeable level signal that lasts of feedback circuit transmission, second control element control reset circuit output reset signal, reset signal be used for with first power supply restarts, first power supply restart be used for with first control element resets, makes second control element receives can in time reflect when the unchangeable level signal that lasts of feedback circuit transmission, then first control element's internal program resets, then first control element makes first power supply reset through reset circuit.
Description
Technical Field
The utility model relates to the technical field of circuits, especially, relate to a power control circuit.
Background
With the development of the technology level, people have more and more functional requirements on electronic products, the existing main chip can generate a phenomenon of 'run away' (the run away means that a program pointer is disordered and a stack is damaged) during operation, and after the phenomenon occurs, if the power supply of the main chip is not reset, the main chip is always in an abnormal state.
Therefore, a power control circuit capable of managing power of a main chip according to an operating state of the main chip is needed.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a main aim at provides a can all manage the power control circuit to each functional module according to the operating condition of main chip.
In order to achieve the above object, the present invention provides a power control circuit, which includes a feedback circuit, a first control element, a second control element, a reset circuit, and a first power supply;
the input end of the feedback circuit is electrically connected with the first control element, the output end of the feedback circuit is electrically connected with the second control element, and the level signal generated by the first control element is transmitted to the second control element through the feedback circuit, wherein the level signal generated by the first control element comprises a second level signal and a first level signal which is output by the first control element and is continuously unchanged in an abnormal state;
the second control element is also electrically connected with the first power supply through the reset circuit, the first power supply is electrically connected with the first control element, and the first power supply is used for supplying electric energy to the first control element;
the second control element is used for controlling the reset circuit to output a reset signal when receiving a second level signal transmitted by the feedback circuit, the reset signal is used for restarting the first power supply, and the first power supply is used for resetting the first control element after restarting.
As a modification, the level signal generated by the first control element includes a continuously varying first level signal output by the first control element in a normal state;
the second control element is used for controlling the reset circuit to output a reset signal when the level signal transmitted by the feedback circuit is changed from the first level signal to the second level signal.
As an improvement, the feedback circuit includes a first power supply, a first resistor, and a first switch;
the first power supply is electrically connected with the first end of the first resistor;
the second end of the first resistor is electrically connected with the second control element and the input end of the first switch;
the control end of the first switch is electrically connected with the first control element.
As an improvement, the feedback circuit further comprises a second resistor;
and the control end of the first switch is electrically connected with the first control element through the second resistor.
As a modification, the reset circuit includes a third resistor and a second switch;
the first end of the third resistor is electrically connected with the second control element, and the second end of the third resistor is electrically connected with the control end of the second switch;
the input end of the second switch is electrically connected with the first control element, and the output end of the second switch is grounded.
As an improvement, the reset circuit further includes a diode;
the first end of the third resistor is electrically connected with the cathode of the diode, and the anode of the diode is electrically connected with the second control element.
As an improvement, the power supply control circuit further comprises an enabling circuit, the first control element is electrically connected with the output end of the enabling circuit through a voltage stabilizing element, and the second control element is electrically connected with the input end of the enabling circuit;
the second control element controls the connection or disconnection of the voltage stabilizing element through the enabling circuit.
As a modification, the enable circuit includes a fourth resistor, a fifth resistor, and a third switch;
a first end of the fourth resistor is electrically connected with a first end of the fifth resistor and the second control element, and a second end of the fourth resistor is electrically connected with the first power supply and an input end of the third switch;
a second end of the fifth resistor is electrically connected with a control end of the third switch;
the output end of the third switch is electrically connected with the voltage stabilizing element.
As an improvement, the enable circuit further comprises a sixth resistor and a seventh resistor, and a first end of the sixth resistor is electrically connected with the output end of the third switch;
a second end of the sixth resistor is electrically connected with the voltage stabilizing element and a first end of the seventh resistor; and the second end of the seventh resistor is grounded.
As an improvement, the power control circuit further includes a main power source, where the main power source is used to supply power to the first power supply and the second control element, and the second control element further includes a power management module, where the management module is electrically connected to the first power supply, and the management module is used to control the second control element to delay power supply with respect to the main power source after the main power source is powered on, and is further used to control the second control element to power off before the main power source is powered off.
Compared with the prior art, in the technical scheme provided by the utility model, when the second control element receives the sustained level signal transmitted by the feedback circuit, the second control element controls the reset circuit to output a reset signal, the reset signal is used for restarting the first power supply, the restart of the first power supply is used for resetting the first control element, so that the second control element can be reflected in time when receiving the continuous and unchangeable level signal transmitted by the feedback circuit, then the internal program of the first control element is reset, then the first control element resets the first power supply source through the reset circuit, therefore, the dilemma that the continuous and unchangeable level signal transmitted by the feedback circuit is not found to cause that the program is always in a 'run away' state is avoided, and the first control element is adjusted to work normally again.
Drawings
Fig. 1 is a functional block diagram of a power control circuit according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a power control circuit according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a variation of voltages of the main power source and the first control element according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, an embodiment of the present invention provides a power control circuit, which includes a feedback circuit 20, a first control element 10, a second control element 30, a reset circuit 40, and a first power supply 50. In the present embodiment, the first control element 10 serves as a main chip, the second control element 30 serves as a power control element, and the first power supply 50 may be a built-in power module of the first control element 10. Integrally, the continuously varying second level signal emitted by said first control element 10, also called feeding dog signal, is an input signal of a watchdog timer circuit; the dog feeding signal is transmitted to the second control element 30 through the feedback circuit 20, and when the second control element 30 detects the dog feeding signal, the first control element 10 is indicated to work normally; when the second control element 30 detects the first level signal (i.e. the dog feeding signal is not detected), which is not constant, indicating that the first control element 10 is abnormal, the second control element 30 restarts the first power supply 50 through the reset circuit 40, and the first control element 10 is reset because the first power supply 50 supplies power to the first control element 10. Specifically, an input end of the feedback circuit 20 is electrically connected to the first control element 10, an output end of the feedback circuit 20 is electrically connected to the second control element 30, and a level signal generated by the first control element 10 is transmitted to the second control element 30 through the feedback circuit 20, wherein the generated level signal includes a continuously changing second level signal and a continuously unchanged first level signal; the second control element 30 is further electrically connected to the first power supply 50 (point c in fig. 2) through the reset circuit 40, the first power supply 50 is electrically connected to the first control element 10, the first power supply 50 provides power for the first control element 10, and the second control element 30 receives a first level signal transmitted by the feedback circuit 20, and specifically, the second control element 30 controls the reset circuit 40 to output a reset signal when receiving a level signal transmitted by the feedback circuit 20, which is changed from the second level signal to the first level signal; the first power supply 50 is reset by the reset circuit 40; therefore, the second control element 30 can be reflected in time when receiving the sustained first level signal transmitted by the feedback circuit 20, then the internal program of the first control element 10 is reset, and then the first control element 10 restarts the first power supply 50 through the reset circuit 40, so as to avoid the situation that the sustained level signal transmitted by the feedback circuit 20 is not found, so that the program is always in a "running away" state, and adjust the first control element 10 to work normally again.
In an embodiment, the receiving of the change of the level signal transmitted by the feedback circuit 20 by the second control element 30 includes: the level signal transmitted by the feedback circuit 20 received by the second control element 30 changes from the continuously changing second level signal to the continuously unchanged low level signal.
Referring to fig. 2, in an embodiment, the feedback circuit 20 includes a first power supply b (providing 3V dc power), a first resistor R1 and a first switch Q1; the first power supply b is electrically connected with a first end of the first resistor R1; a second terminal of the first resistor R1 is electrically connected to the second control element 30 and an input terminal of the first switch Q1; the control end of the first switch Q1 is electrically connected with the first control element 10; preferably, the feedback circuit 20 further includes a second resistor R2; a control terminal of the first switch Q1 is electrically connected with the first control element 10 through the second resistor R2; the feeding dog signal from the first control element 10 can be transmitted to the second control element 30 via a feedback circuit 20.
In one embodiment, the reset circuit 40 includes a third resistor R3 and a second switch Q2; a first end of the third resistor R3 is electrically connected to the second control element 30, and a second end of the third resistor R3 is electrically connected to a control end of the second switch Q2; the input end of the second switch Q2 is electrically connected with the first control element 10, and the output end of the second switch Q2 is grounded; preferably, the reset circuit 40 further includes a diode D1; the first end of the third resistor R3 is electrically connected to the cathode of the diode D1, the anode of the diode D1 is electrically connected to the second control element 30, and the diode D1 prevents a current from flowing in the reverse direction into the second control element 30, thereby preventing the second control element 30 from being burned.
More preferably, the anode of the diode D1 is further electrically connected to a first end of an eighth resistor R8, a second end of the eighth resistor R8 is electrically connected to the first power supply b and the first pole of the first capacitor, and a second pole of the first capacitor is grounded.
In one embodiment, the power control circuit further includes an enable circuit 60, the output terminal of the first control element 10 is electrically connected to the enable circuit 60 through a voltage stabilizing element 70, and the input terminal of the enable circuit 60 is electrically connected to the second control element 30; the second control element 10 controls the on or off of the voltage stabilization element 70 through the enable circuit 60; in the present embodiment, the enable circuit 60 includes a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a third switch Q3; a first end of the fourth resistor R4 is electrically connected to a first end of the fifth resistor R5 and the second control element 30, and a second end of the fourth resistor R4 is electrically connected to the first power supply b and an input end of the third switch Q3; a second terminal of the fifth resistor R5 is electrically connected to a control terminal of the third switch Q3; an output end of the third switch Q3 is electrically connected with a first end of the sixth resistor R6; a second end of the sixth resistor R6 is electrically connected to the voltage stabilizing element 70; preferably, the enabling circuit 60 further comprises a seventh resistor R7; a first end of the seventh resistor R7 is electrically connected to the voltage stabilizing element 70, and a second end of the seventh resistor R7 is grounded; the purpose is to make the first control element 10 in a reset state without a burning program and unable to work; the enabling circuit 60 can be used to open or close the enabling terminal of the voltage stabilizing element 70, thereby controlling the voltage stabilizing element 70 to be powered on or powered off.
Specifically, the power control circuit further includes a main power supply (not shown in the figure) for supplying power to the first power supply 50 and the second control element 30, the second control element 30 further includes a power management module (not shown in the figure), the management module is electrically connected to the first power supply 50, the management module is configured to control the second control element 30 to delay power supply with respect to the main power supply after the main power supply is powered on, and is further configured to control the second control element 30 to power off before the main power supply is powered off (specifically, referring to fig. 3, solid lines indicate changes of POW _ EN and RST voltage, POW _ EN indicates the voltage of the main power supply, RST indicates the voltage of the second control element, and horizontal direction indicates time), the power control circuit not only has a function of preventing a dead halt, but also has a function of power management on the second control element 30, when the power is on and the crash and restart are performed, the work is stopped and then the power is on, so that the power failure of the second control element 30 during the work is avoided; it should be noted that the programs run in the management module in this embodiment are all existing programs, and a person skilled in the art can program a program corresponding to the chip in this embodiment according to the existing technology and burn the program into the second control element 30 in this embodiment, so that the management module of the second control element 30 in this embodiment completes the related functions described in this embodiment.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The power supply control circuit is characterized by comprising a feedback circuit, a first control element, a second control element, a reset circuit and a first power supply source;
the input end of the feedback circuit is electrically connected with the first control element, the output end of the feedback circuit is electrically connected with the second control element, and the level signal generated by the first control element is transmitted to the second control element through the feedback circuit, wherein the level signal generated by the first control element comprises a second level signal and a first level signal which is output by the first control element and is continuously unchanged in an abnormal state;
the second control element is also electrically connected with the first power supply through the reset circuit, the first power supply is electrically connected with the first control element, and the first power supply is used for supplying electric energy to the first control element;
the second control element is used for controlling the reset circuit to output a reset signal when receiving a second level signal transmitted by the feedback circuit, the reset signal is used for restarting the first power supply, and the first power supply is used for resetting the first control element after restarting.
2. The power control circuit of claim 1, wherein the level signal generated by the first control element comprises a continuously varying first level signal output by the first control element in a normal state;
the second control element is used for controlling the reset circuit to output a reset signal when the level signal transmitted by the feedback circuit is changed from the first level signal to the second level signal.
3. The power control circuit of claim 1, wherein the feedback circuit comprises a first power supply, a first resistor, and a first switch;
the first power supply is electrically connected with the first end of the first resistor;
the second end of the first resistor is electrically connected with the second control element and the input end of the first switch;
the control end of the first switch is electrically connected with the first control element.
4. The power control circuit of claim 3, wherein the feedback circuit further comprises a second resistor;
and the control end of the first switch is electrically connected with the first control element through the second resistor.
5. The power supply control circuit of claim 1, wherein the reset circuit comprises a third resistor and a second switch;
the first end of the third resistor is electrically connected with the second control element, and the second end of the third resistor is electrically connected with the control end of the second switch;
the input end of the second switch is electrically connected with the first control element, and the output end of the second switch is grounded.
6. The power supply control circuit of claim 5, wherein the reset circuit further comprises a diode;
the first end of the third resistor is electrically connected with the cathode of the diode, and the anode of the diode is electrically connected with the second control element.
7. The power supply control circuit according to claim 1, wherein the power supply control circuit further comprises an enable circuit, the first control element is electrically connected to an output terminal of the enable circuit through a voltage stabilizing element, and the second control element is electrically connected to an input terminal of the enable circuit;
the second control element controls the connection or disconnection of the voltage stabilizing element through the enabling circuit.
8. The power control circuit of claim 7, wherein the enable circuit comprises a fourth resistor, a fifth resistor, and a third switch;
a first end of the fourth resistor is electrically connected with a first end of the fifth resistor and the second control element, and a second end of the fourth resistor is electrically connected with the first power supply and an input end of the third switch;
a second end of the fifth resistor is electrically connected with a control end of the third switch;
the output end of the third switch is electrically connected with the voltage stabilizing element.
9. The power control circuit of claim 8, wherein the enable circuit further comprises a sixth resistor, a seventh resistor, a first end of the sixth resistor being electrically connected to the output terminal of the third switch;
a second end of the sixth resistor is electrically connected with the voltage stabilizing element and a first end of the seventh resistor; and the second end of the seventh resistor is grounded.
10. The power control circuit of claim 9, further comprising a primary power source configured to provide power to the first power source and the second control element, wherein the second control element further comprises a power management module electrically connected to the first power source, wherein the management module is configured to control the second control element to delay power supply with respect to the primary power source after the primary power source is powered on and further configured to control the second control element to power off before the primary power source is powered off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020090421.9U CN211506404U (en) | 2020-01-15 | 2020-01-15 | Power supply control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020090421.9U CN211506404U (en) | 2020-01-15 | 2020-01-15 | Power supply control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211506404U true CN211506404U (en) | 2020-09-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020090421.9U Active CN211506404U (en) | 2020-01-15 | 2020-01-15 | Power supply control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211506404U (en) |
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2020
- 2020-01-15 CN CN202020090421.9U patent/CN211506404U/en active Active
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