CN101446912B - Monitoring circuit - Google Patents
Monitoring circuit Download PDFInfo
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- CN101446912B CN101446912B CN2008102179896A CN200810217989A CN101446912B CN 101446912 B CN101446912 B CN 101446912B CN 2008102179896 A CN2008102179896 A CN 2008102179896A CN 200810217989 A CN200810217989 A CN 200810217989A CN 101446912 B CN101446912 B CN 101446912B
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Abstract
The invention is applied to the monitoring field and provides a monitoring circuit. The monitoring circuit comprises a power end which is connected with a main power supply and a monitored object for controlling a power switch of power supply of the monitored object; a discharging switch which connects the power end of the monitored object with ground and controls the discharging of the monitored object; a first control circuit which is connected with the power switch, the discharging switch, the main power supply and the monitored object, receives working state signals sent out by the monitored object and controls the make and break of the power switch and the discharging switch. The first control circuit sends out a reset signal to the monitored object. In the embodiment of the invention, the first control circuit controls the make and break of the power switch and the discharging switch according to the working state signals sent out by the monitored object, thereby ensuring that the monitoring circuit actuates the power-off, the discharging, the power-up and the reset of the monitored object to restore the normal operation again when the work of the monitored object is abnormal.
Description
Technical field
The invention belongs to the monitoring field, relate in particular to a kind of supervisory circuit.
Background technology
Common surveillance monitor object, microcomputer circuit particularly, whether the watchdog circuit of operate as normal (watchdog, WDG), if surpassing the pulse that fixed length does not receive in the time that monitored object is exported, watchdog circuit will be exported reset signal to monitored object and make its operate as normal.
In most cases doing like this is effectively, if but monitored object when running into strong jamming, take place to plug in the valve phenomenon, only depending on so resets can not allow it rework, and must carry out could solving after the power down process to it.Up to now, also do not develop the supervisory circuit that possesses the power down control function, can't guarantee the operate as normal of monitored object.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of supervisory circuit, is intended to solve existing supervisory circuit and has the problem that can't guarantee the monitored object operate as normal.
The embodiment of the invention is achieved in that a kind of supervisory circuit, and described supervisory circuit comprises:
The power end that connects primary power cource and monitored object, the power switch of control monitored object power supply;
The power end and ground that connect described monitored object, the discharge switch of control monitored object discharge; And
The first control circuit that is connected with described power switch, discharge switch, primary power cource and monitored object, described first control circuit receives the working state signal that described monitored object sends, when described monitored object work is undesired, described first control circuit is controlled described power switch and is disconnected, control described discharge switch closure, after the described monitored object discharge, described first control circuit is controlled described discharge switch and is disconnected, control described power switch closure, and send reset signal to described monitored object.
In embodiments of the present invention, the working state signal that first control circuit sends according to monitored object, control power switch and discharge switch break-make, thereby the work when monitored object of guaranteeing takes place when unusual, supervisory circuit is impelled the monitored object power down, discharges, powers on and is resetted, and recovers operate as normal again.
Description of drawings
Fig. 1 is the structural drawing of the supervisory circuit that provides of first embodiment of the invention;
Fig. 2 is the structural drawing of the supervisory circuit that provides of second embodiment of the invention;
Fig. 3 is the exemplary circuit figure of the supervisory circuit that provides of first embodiment of the invention;
Fig. 4 is the exemplary circuit figure of the supervisory circuit that provides of second embodiment of the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Fig. 1 shows the structure of the supervisory circuit that first embodiment of the invention provides, and for convenience of explanation, only shows the part relevant with the embodiment of the invention.
The supervisory circuit that the embodiment of the invention provides comprises the power end that connects primary power cource and monitored object, the power switch 100 of control monitored object power supply, the power end and ground that connect monitored object, the discharge switch 200 of control monitored object discharge, and with power switch 100, discharge switch 200, the first control circuit 300 that primary power cource is connected with monitored object, first control circuit 300 receives the working state signal that monitored object sends, when monitored object work is undesired, first control circuit 300 control power switches 100 disconnect, control discharge switch 200 closures, after the monitored object discharge, first control circuit 300 control discharge switches 200 disconnect, control power switch 100 closures, and send reset signal to monitored object.
The principle of work of the supervisory circuit that the embodiment of the invention provides is:
When monitored object sends to the working state signal of first control circuit 300 when undesired, first control circuit 300 control power switches 100 disconnect, discharge switch 200 closures, and then monitored object power down, and the electric capacity of monitored object inside discharges;
After the power down time through regulation, first control circuit 300 control discharge switches 200 disconnect, power switch 100 closures, and then power supply continues monitored object is powered, and first control circuit 300 sends reset signal to monitored object, makes it restart work.
Fig. 2 shows the structure of the supervisory circuit that second embodiment of the invention provides, and for convenience of explanation, only shows the part relevant with the embodiment of the invention.
As one embodiment of the invention, supervisory circuit also comprises commutation circuit 400, and the input end of commutation circuit 400 connects primary power cource and standby power supply, and output terminal connects power switch 100.When primary power cource was effective, promptly primary power cource was greater than 3.5V, and commutation circuit 400 is connected primary power cource and power switch 100, and the power supply of monitored object is provided by primary power cource; When primary power cource was invalid, promptly primary power cource was less than 3.2V, and commutation circuit 400 is connected standby power supply and power switch 100, and the power supply of monitored object is provided by standby power supply.
As one embodiment of the invention, also be connected with primary power cource supervisory circuit 500 between primary power cource and the first control circuit 300, the validity of its identification primary power cource, when primary power cource is effective, primary power cource is offered first control circuit 300, start first control circuit 300 work, when primary power cource is invalid, disconnecting primary power cource is the power supply of first control circuit 300, disconnects discharge switch 200 simultaneously.
As one embodiment of the invention, supervisory circuit also comprises the second control circuit 600 that is connected with standby power supply, primary power cource supervisory circuit 500, power switch 100 and discharge switch 200 respectively, second control circuit 600 is controlled by primary power cource supervisory circuit 500, when primary power cource is effective, second control circuit 600 is not worked, when primary power cource was invalid, second control circuit 600 control power switches 100 closures offered monitored object with standby power supply.
The principle of work of the supervisory circuit that the embodiment of the invention provides is:
(1) when primary power cource is effective, promptly primary power cource is greater than 3.5V, and commutation circuit 400 is connected primary power cource and power switch 100, and the power supply of monitored object is provided by primary power cource.
The validity of primary power cource supervisory circuit 500 identification primary power cources, when primary power cource is effective, primary power cource is offered first control circuit 300, start first control circuit 300 work, control second control circuit 600 simultaneously and do not work, when monitored object sends to the working state signal of first control circuit 300 when undesired, first control circuit 300 control power switches 100 disconnect, discharge switch 200 closures, then monitored object power down, and the electric capacity of monitored object inside discharges;
After the power down time through regulation, first control circuit 300 control discharge switches 200 disconnect, power switch 100 closures, and then power supply continues monitored object is powered, and first control circuit 300 sends reset signal to monitored object, makes it restart work.
(2) when primary power cource is invalid, be that primary power cource is less than 3.2V, commutation circuit 400 is connected standby power supply and power switch 100, it is invalid that primary power cource supervisory circuit 500 recognizes primary power cource, disconnecting primary power cource is the power supply of first control circuit 300, disconnect discharge switch 200 simultaneously, first control circuit 300 can't be worked owing to do not power, supervisory circuit is no longer monitored monitored object, second control circuit 600 is controlled by primary power cource supervisory circuit 500, control power switch 100 closures, standby power supply is the monitored object power supply, supervisory circuit enters battery saving mode.
Fig. 3 shows the exemplary circuit structure of the supervisory circuit that first embodiment of the invention provides.
Its principle of work is:
When monitored object sends to the working state signal of control chip U1 when undesired by its output terminal, control chip U1 transmits control signal to power switch 100 by its first I/O end I/O1, the grid that makes the metal-oxide-semiconductor Q1 that wins is a high level, the first not conducting of metal-oxide-semiconductor Q1, power switch 100 disconnects, then monitored object power down, then, control chip U1 transmits control signal to discharge switch 200 by its second I/O end I/O2, make that the grid of the second metal-oxide-semiconductor Q2 is a high level, the second metal-oxide-semiconductor Q2 conducting, discharge switch 200 closures, then the electric capacity of monitored object inside discharges.
After the power down time through regulation, control chip U1 transmits control signal to discharge switch 200 by its second I/O end I/O2, make that the grid of the second metal-oxide-semiconductor Q2 is a low level, the second not conducting of metal-oxide-semiconductor Q2, discharge switch 200 disconnects, control chip U1 transmits control signal to power switch 100 by its first I/O end I/O1, the grid that makes the metal-oxide-semiconductor Q1 that wins is a low level, the first metal-oxide-semiconductor Q1 conducting, power switch 100 closures, then primary power cource continues monitored object is powered, and control chip U1 sends reset signal to monitored object by its 4th I/O end I/O4, makes it restart work.
Fig. 4 shows the exemplary circuit structure of the supervisory circuit that second embodiment of the invention provides.
As one embodiment of the invention, supervisory circuit also comprises the commutation circuit 400 that is made of the first diode D1 and the second diode D2, the anode of the first diode D1 connects standby power supply, the anode of the second diode D2 connects primary power cource, and the negative electrode of the first diode D1 and the second diode D2 connects the source electrode of the first metal-oxide-semiconductor Q1 simultaneously.When primary power cource was effective, promptly primary power cource was greater than 3.5V, and commutation circuit 400 is connected primary power cource and power switch 100, and the power supply of monitored object is provided by primary power cource; When primary power cource was invalid, promptly primary power cource was less than 3.2V, and commutation circuit 400 is connected standby power supply and power switch 100, and the power supply of monitored object is provided by standby power supply.
Also be connected with primary power cource supervisory circuit 500 between primary power cource and the first control circuit 300, it is made of Schmidt circuit, its input termination primary power cource, and its output terminal VCC connects the power end VCC of control chip U1.
Supervisory circuit also comprises second control circuit 600, and it is made of feedback circuit, and its feeder ear is connected with standby power supply, and its feedback input end VCC meets the output terminal VCC of Schmidt circuit, and its feedback output end connects the drain and gate of the first metal-oxide-semiconductor Q1.
The principle of work of the supervisory circuit that the embodiment of the invention provides is:
(1) when primary power cource is effective, promptly primary power cource is greater than 3.5V, and commutation circuit 400 is connected primary power cource and power switch 100, and the power supply of monitored object is provided by primary power cource.
The validity of Schmidt circuit identification primary power cource, when primary power cource is effective, primary power cource is offered control chip U1, start-up control chip U1 work, the Control and Feedback circuit is not worked simultaneously, when monitored object sends to the working state signal of control chip U1 when undesired by its output terminal, control chip U1 transmits control signal to power switch 100 by its first I/O end I/O1, the grid that makes the metal-oxide-semiconductor Q1 that wins is a high level, the first not conducting of metal-oxide-semiconductor Q1, power switch 100 disconnects then monitored object power down, then, control chip U1 transmits control signal to discharge switch 200 by its second I/O end I/O2, makes that the grid of the second metal-oxide-semiconductor Q2 is a high level, the second metal-oxide-semiconductor Q2 conducting, discharge switch 200 closures, then the electric capacity of monitored object inside discharges.
After the power down time through regulation, control chip U1 transmits control signal to discharge switch 200 by its second I/O end I/O2, make that the grid of the second metal-oxide-semiconductor Q2 is a low level, the second not conducting of metal-oxide-semiconductor Q2, discharge switch 200 disconnects, control chip U1 transmits control signal to power switch 100 by its first I/O end I/O1, the grid that makes the metal-oxide-semiconductor Q1 that wins is a low level, the first metal-oxide-semiconductor Q1 conducting, power switch 100 closures, then primary power cource continues monitored object is powered, and control chip U1 sends reset signal to monitored object by its 4th I/O end I/O4, makes it restart work.
(2) when primary power cource is invalid, be that primary power cource is less than 3.2V, commutation circuit 400 is connected standby power supply and power switch 100, it is invalid that Schmidt circuit recognizes primary power cource, disconnecting primary power cource is the power supply of control chip U1, control chip U1 is under power-down conditions, its each terminal can be considered high resistant " ", the second not conducting of metal-oxide-semiconductor Q2, discharge switch 200 disconnects, control chip U1 can't work owing to do not power, supervisory circuit is no longer monitored monitored object, and feedback circuit is controlled by control chip U1, control power switch 100 closures, standby power supply is the monitored object power supply, and supervisory circuit enters battery saving mode.
Above-mentioned monitored object can be a microcomputer circuit.
In embodiments of the present invention, the working state signal that first control circuit sends according to monitored object, control power switch and discharge switch break-make, thereby the work when monitored object of guaranteeing takes place when unusual, supervisory circuit is impelled the monitored object power down, discharges, powers on and is resetted, and recovers operate as normal again.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. a supervisory circuit is characterized in that, described supervisory circuit comprises:
The power end that connects primary power cource and monitored object, the power switch of control monitored object power supply;
The power end and ground that connect described monitored object, the discharge switch of control monitored object discharge; And
The first control circuit that is connected with described power switch, discharge switch, primary power cource and monitored object, described first control circuit receives the working state signal that described monitored object sends, when described monitored object work is undesired, described first control circuit is controlled described power switch and is disconnected, control described discharge switch closure, after the described monitored object discharge, described first control circuit is controlled described discharge switch and is disconnected, control described power switch closure, and send reset signal to described monitored object.
2. supervisory circuit as claimed in claim 1 is characterized in that described supervisory circuit also comprises commutation circuit, and the input end of described commutation circuit connects primary power cource and standby power supply, and output terminal connects described power switch.
3. supervisory circuit as claimed in claim 2, it is characterized in that, also be connected with the primary power cource supervisory circuit between described primary power cource and the first control circuit, the validity of described primary power cource supervisory circuit identification primary power cource is controlled the work of described first control circuit.
4. supervisory circuit as claimed in claim 3, it is characterized in that, described supervisory circuit also comprises respectively the second control circuit that is connected with discharge switch with described standby power supply, primary power cource supervisory circuit, power switch, described second control circuit is controlled by described primary power cource supervisory circuit, when described primary power cource is effective, described second control circuit is not worked, when described primary power cource is invalid, described second control circuit is controlled described power switch closure, and described standby power supply is offered monitored object.
5. supervisory circuit as claimed in claim 1, it is characterized in that, described power switch comprises first metal-oxide-semiconductor, first resistance and second resistance, the source electrode of described first metal-oxide-semiconductor connects described primary power cource, the grid of described first metal-oxide-semiconductor is leaded up to described first resistance eutral grounding, and another road connects an end of described second resistance.
6. supervisory circuit as claimed in claim 5, it is characterized in that, described discharge switch comprises second metal-oxide-semiconductor, the 3rd resistance, the 4th resistance and the 5th resistance, one end of described the 3rd resistance connects the drain electrode of described first metal-oxide-semiconductor and the power end of monitored object simultaneously, the drain electrode of described second metal-oxide-semiconductor of another termination of described the 3rd resistance, the source ground of described second metal-oxide-semiconductor, the grid one tunnel of described second metal-oxide-semiconductor connects an end of described the 4th resistance, and another road is by described the 5th resistance eutral grounding.
7. supervisory circuit as claimed in claim 6, it is characterized in that, described first control circuit comprises control chip, the described primary power cource of power supply termination of described control chip, the other end of described second resistance of the first I/O termination of described control chip, the other end of described the 4th resistance of the second I/O termination of described control chip, the output terminal of the described monitored object of the 3rd I/O termination of described control chip, the reset signal end of the described monitored object of the 4th I/O termination of described control chip.
8. supervisory circuit as claimed in claim 2, it is characterized in that, described commutation circuit comprises first diode and second diode, the anode of described first diode connects described standby power supply, the anode of described second diode connects described primary power cource, and the negative electrode of described first diode and second diode connects described power switch simultaneously.
9. supervisory circuit as claimed in claim 3 is characterized in that, described primary power cource supervisory circuit is made of Schmidt circuit.
10. supervisory circuit as claimed in claim 4 is characterized in that described second control circuit is made of feedback circuit.
11. supervisory circuit as claimed in claim 1 is characterized in that, described monitored object is a microcomputer circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102179896A CN101446912B (en) | 2008-12-05 | 2008-12-05 | Monitoring circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102179896A CN101446912B (en) | 2008-12-05 | 2008-12-05 | Monitoring circuit |
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| Publication Number | Publication Date |
|---|---|
| CN101446912A CN101446912A (en) | 2009-06-03 |
| CN101446912B true CN101446912B (en) | 2010-09-29 |
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| CN2008102179896A Active CN101446912B (en) | 2008-12-05 | 2008-12-05 | Monitoring circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103427403B (en) * | 2012-05-25 | 2016-08-24 | 华为终端有限公司 | The guard method of a kind of electronic equipment and electronic equipment |
| CN104020705A (en) * | 2014-06-23 | 2014-09-03 | 苏州塔可盛电子科技有限公司 | Power monitoring circuit with resetting function |
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| CN101446912A (en) | 2009-06-03 |
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Owner name: JIANGSU LINYANG ELECTRONICS CO., LTD. Free format text: FORMER OWNER: SHENZHEN LINYANG ELECTRONIC TECHNOLOGY CO., LTD. Effective date: 20120929 |
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Free format text: CORRECT: ADDRESS; FROM: 518000 SHENZHEN, GUANGDONG PROVINCE TO: 226200 NANTONG, JIANGSU PROVINCE |
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Effective date of registration: 20120929 Address after: 226200 Jiangsu city of Nantong province Qidong Economic Development Zone No. 666 Lin Yang Lu Patentee after: Jiangsu Linyang Electronics Co., Ltd. Address before: 3, 3F building, 518000 China Science and Technology Development Institute, South hi tech Zone, Guangdong, Shenzhen Patentee before: ShenZhen Linyang ElectronicTechnology Co., Ltd. |
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Address after: 226299 Jiangsu city of Nantong province Qidong Economic Development Zone No. 666 Lin Yang Lu Patentee after: JIANGSU LINYANG ENERGY CO., LTD. Address before: 226200 Jiangsu city of Nantong province Qidong Economic Development Zone No. 666 Lin Yang Lu Patentee before: Jiangsu Linyang Electronics Co., Ltd. |