CN114237079B - Circuit capable of utilizing serial port to turn off power supply - Google Patents
Circuit capable of utilizing serial port to turn off power supply Download PDFInfo
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- CN114237079B CN114237079B CN202111164015.8A CN202111164015A CN114237079B CN 114237079 B CN114237079 B CN 114237079B CN 202111164015 A CN202111164015 A CN 202111164015A CN 114237079 B CN114237079 B CN 114237079B
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- 239000003990 capacitor Substances 0.000 claims description 47
- 208000028659 discharge Diseases 0.000 claims description 33
- 238000010586 diagram Methods 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24215—Scada supervisory control and data acquisition
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Abstract
The invention relates to a circuit capable of utilizing a serial port to turn off a power supply, which comprises a power supply input end, a power supply output end, an MCU serial port, a first-stage turn-off module capable of turning on or off the circuit by a charge-discharge mode to control the on-off of the power supply, and a second-stage turn-off module which is connected with the first-stage turn-off module and can influence the on-off time of the first-stage turn-off module by the charge-discharge speed of the circuit to control the on-off of the power supply; the primary turn-off module is connected between the power input end and the power output end, and the secondary turn-off module is respectively connected with the MCU serial port, the power input end and the primary turn-off module; and the sum of the discharging time of the secondary turn-off module and the charging time of the primary turn-off module is larger than k times of the low level duration t1 in one signal period when the MCU serial port is used as a normal communication channel so as to ensure the normal operation of the circuit, and smaller than the low level duration t2 continuously input by the MCU serial port when the power supply is turned off so as to ensure the realization of the power supply turn-off function. The circuit has simple design structure and high reliability.
Description
Technical Field
The invention relates to the field of electronic circuits, in particular to a super capacitor charging circuit.
Background
The general switch control circuit mostly adopts the structure shown in fig. 1, and uses the GPIO port of the MCU to control the turn-off of the power supply circuit, which needs to occupy one GPIO port of the MCU, so that the current circuit structure cannot be applied to the condition that the pin connection between the module and the ammeter is pretty, and the current turn-off circuit is impractical for the condition that the ammeter is shipped in batches and the plug-in port cannot be changed.
Therefore, it is necessary to design a new turn-off control circuit, and in the case that the GPIO port resources of the MCU are limited or the product definition is limited, the IO port or other resources are not newly added or wasted, but the turn-off function of the power supply can still be realized, and meanwhile, the normal operation of the device is ensured.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a circuit capable of turning off a power supply by using a serial port, which can realize a power supply turning off function without adding a new IO port or modifying the structure of the existing product, and has a simple structural design and high reliability.
In order to achieve the above purpose, the technical scheme of the invention is as follows: the utility model provides a circuit that usable serial ports turn off power, the circuit includes power input end, power output end and MCU serial ports, its characterized in that:
The circuit also comprises a first-stage turn-off module which can be turned on or turned off by itself in a charge-discharge mode to control the on-off of the power supply, and a second-stage turn-off module which is connected with the first-stage turn-off module and can influence the on-off time of the first-stage turn-off module by itself in a charge-discharge speed to control the on-off of the power supply;
The primary turn-off module is connected between the power input end and the power output end, and the secondary turn-off module is respectively connected with the MCU serial port, the power input end and the primary turn-off module;
And the sum of the discharging time of the secondary turn-off module and the charging time of the primary turn-off module is larger than k times of the low level duration t1 in one signal period when the MCU serial port is used as a normal communication channel so as to ensure the normal operation of the circuit, and smaller than the low level duration t2 continuously input by the MCU serial port when the power supply is turned off so as to ensure the realization of the power supply turn-off function.
Further, the secondary turn-off module comprises a pull-up resistor connected with the power input end, a secondary switch tube electrically connected with the pull-up resistor and the MCU serial port respectively and turned on when the MCU serial port inputs high level, and an RCD charge-discharge module arranged between the pull-up resistor and the secondary switch tube and charged when the secondary switch tube is turned on and capable of turning off the secondary switch tube in a discharge mode when the MCU serial port inputs low level.
Furthermore, the primary turn-off module comprises a primary switch tube connected between the power input end and the power output end to control the power on-off through the self on-off, and an RC charge-discharge module which is respectively connected with the primary switch tube and the secondary switch tube and enables the primary switch tube to be turned on in a discharge mode when the secondary switch tube is turned on and enables the primary switch tube to be turned off in a charge mode when the secondary switch tube is turned off.
Further, the RCD charge-discharge module comprises a secondary capacitor connected with the secondary switch tube, a unidirectional flow guide component connected with the pull-up resistor and the secondary capacitor in series to charge the secondary capacitor when the secondary switch tube is conducted, and a secondary discharge resistor connected with the secondary capacitor and the MCU serial port in series and used for discharging the secondary capacitor when the MCU serial port continuously inputs low level, wherein the unidirectional flow guide component and the secondary discharge resistor are arranged in parallel.
Further, the unidirectional current guiding component is a diode which is connected in series between the pull-up resistor and the secondary capacitor in the forward direction.
Further, the RCD charge-discharge module further comprises a second resistor connected in series between the unidirectional current guiding component and the pull-up resistor, the MCU serial port is connected between the second resistor and the pull-up resistor, and the resistance value of the secondary bleeder resistor is greater than n times of that of the second resistor.
Further, the primary switch tube is connected with the secondary switch tube, and the RC charge-discharge module comprises a primary capacitor which is respectively connected with the primary switch tube and the secondary switch tube and discharges when the secondary switch tube is turned on, a primary discharge resistor which is connected between the secondary switch tube and the primary switch tube in series and is connected with the primary capacitor so as to discharge the primary capacitor, and a primary charging resistor which is connected between the power input end and the primary capacitor and is used for charging the primary capacitor when the secondary switch tube is turned off.
Further, one end of the primary capacitor is connected between the power input end and the primary switch tube, and the other end of the primary capacitor is connected between the primary switch tube and the primary bleeder resistor;
one end of the primary charging resistor is connected between the secondary switch tube and the primary discharging resistor, and the other end of the primary charging resistor is connected between the power input end and the primary capacitor.
Further, the resistance value of the primary charging resistor is m times larger than that of the primary discharging resistor.
Further, the primary switching tube is a P-channel enhanced MOS tube, and the secondary switching tube is an N-channel enhanced MOS tube.
Compared with the prior art, the invention has the advantages that:
The charging and discharging time of the first-stage turn-off module is influenced by the second-stage turn-off module, the sum of the discharging time of the second-stage turn-off module and the charging time of the first-stage turn-off module is larger than k times of the low-level duration in one period when the MCU serial port normally communicates and smaller than the duration of continuous input low level of the MCU serial port when the power supply is turned off, and therefore the power supply turn-off and the normal work of a circuit can be achieved on the basis of not increasing the serial port effectively, the structure is simple, and the reliability is high.
Drawings
FIG. 1 is a schematic diagram of a circuit for turning off a power supply by using a serial port according to the present application.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
FIG. 1 shows a preferred embodiment of a circuit of the present application that can utilize a serial port to power down. The circuit comprises a power input end 1, a power output end 2 and an MCU serial port 3, and meanwhile, the circuit further comprises a first-stage turn-off module 4 which can be turned on or turned off by a charging and discharging mode to control the on-off of a power supply, and a second-stage turn-off module 5 which is connected with the first-stage turn-off module 4 and can influence the on-off time of the first-stage turn-off module 4 by the charging and discharging speed of the circuit to control the on-off of the power supply, wherein the first-stage turn-off module 4 is connected between the power input end 1 and the power output end 2, and the second-stage turn-off module 5 is respectively connected with the MCU serial port 3, the power input end 1 and the first-stage turn-off module 4.
Meanwhile, the sum of the discharging time T2 of the secondary turn-off module 5 and the charging time T1 of the primary turn-off module 4 is larger than k times of the low-level duration T1 in one signal period when the MCU serial port 3 is used as a normal communication channel, so that the normal operation of a circuit is ensured, and is smaller than the low-level duration T2 continuously input by the MCU serial port 3 when the power supply is turned off, so that the power supply turn-off function is ensured to be realized, namely k is smaller than T1+ T2 and smaller than T2, and k takes a value of 100.
Specifically, the secondary turn-off module 5 includes a pull-up resistor R25 connected to the power input terminal 1, a secondary switch tube M4 electrically connected to the pull-up resistor R25 and the MCU serial port 3, and turned on when the MCU serial port 3 inputs a high level, and an RCD charge-discharge module 51 disposed between the pull-up resistor R25 and the secondary switch tube M4 and charged when the secondary switch tube M4 is turned on, and capable of turning off the secondary switch tube M4 by discharging when the MCU serial port 3 inputs a low level.
Correspondingly, the primary turn-off module 4 comprises a primary switch tube M2 connected between the power input end 1 and the power output end 2 to control the power on-off through the on-off of the primary switch tube M2 and the secondary switch tube M4, and an RC charge-discharge module 41 which is respectively connected with the primary switch tube M2 and the secondary switch tube M4 and enables the primary switch tube M2 to be turned on in a discharging mode when the secondary switch tube M4 is turned on and enables the primary switch tube M2 to be turned off in a charging mode when the secondary switch tube M4 is turned off.
As shown in fig. 1, the RCD charge-discharge module 51 includes a secondary capacitor C28 connected to the secondary switch tube M4, a unidirectional current guiding component connected in series with the pull-up resistor R25 and the secondary capacitor C28 to charge the secondary capacitor C28 when the secondary switch tube M4 is turned on, and a secondary discharge resistor R27 connected in series with the secondary capacitor C28 and the MCU serial port 3 and configured to discharge the secondary capacitor C28 when the MCU serial port 3 continuously inputs a low level, where the unidirectional current guiding component is parallel connected with the secondary discharge resistor R27.
In this embodiment, the unidirectional current guiding component is a diode VD7 connected in series between the pull-up resistor R25 and the secondary capacitor C28. Meanwhile, the RCD charge-discharge module further comprises a second resistor R26 connected in series between the unidirectional flow guide component and the pull-up resistor R25, the MCU serial port 3 is connected between the second resistor R26 and the pull-up resistor R25, and the resistance of the secondary bleeder resistor R27 is larger than n times of the resistance of the second resistor R26. Here, n takes a value of 50.
With continued reference to fig. 1, the primary switch tube M2 is connected to the secondary switch tube M4, and the RC charge-discharge module 41 includes a primary capacitor C24 connected to the primary switch tube M2 and the secondary switch tube M4 respectively and discharging when the secondary switch tube M4 is turned on, a primary discharge resistor R22 connected in series between the secondary switch tube M4 and the primary switch tube M2 and connected to the primary capacitor C24 for discharging the primary capacitor C24, and a primary charge resistor R20 connected between the power input terminal 1 and the primary capacitor C24 and charging the primary capacitor C24 when the secondary switch tube M4 is turned off.
One end of the primary capacitor C24 is connected between the power input end 1 and the primary switch tube M2, the other end of the primary capacitor C is connected between the primary switch tube M2 and the primary bleeder resistor R22, meanwhile, one end of the primary charging resistor R20 is connected between the secondary switch tube M4 and the primary bleeder resistor R22, the other end of the primary charging resistor R20 is connected between the power input end 1 and the primary capacitor C24, and the resistance value of the primary charging resistor R20 is M times greater than that of the primary bleeder resistor R22. Here, m takes a value of 5.
In the application, the primary switching tube M2 is a P-channel enhancement type MOS tube, and the secondary switching tube is an N-channel enhancement type MOS tube.
The working principle of the circuit is described below. In the application, the power input end 1 and the power output end 2 correspond to 5V, and the 5V power input 5V_IN is the switch input front end of the system, is the input power of the system, and is used for supplying power to the system, and the 5V power output 5V_OUT is the switch input rear end of the system, and the front end power input is used for supplying power to the system after being switched.
MCU serial ports 3 corresponds pin MCU_TX, can regard as the sending function of serial ports to normally communicate at ordinary times, when needing to turn off 5V_OUT power, realizes through controlling this pin to pull down for a long time, say 10s, and this time is decided by RC parameter in the circuit, and specific reason is:
in the two-stage MOS tube switch M4 and the RCD charge-discharge circuit, the G stage of M4 is always high because R25 is pulled up to the power supply 5V, and M4 is conducted. When the back-end power supply needs to be turned off, MCU_TX is pulled low for a long time, so that the G level of M4 is pulled low, and M4 is turned off.
When the MOS transistor M4 is turned on, the MOS transistor M4 is not turned on immediately, but is turned on by a 5V_IN high level through R25 and an RCD charging circuit consisting of R26, VD7 and C28, and when the charging voltage reaches the VGS on threshold of M4, the MOS transistor M4 is turned on.
When the MOS tube M4 is turned off, the voltage at the end M4 is discharged from the capacitor C28 to the ground through the capacitors R27 and R26 when the MCU_TX is pulled down, and when the voltage falls below the VGS threshold of the end M4, the end M4 is turned off.
In the RC charge-discharge control circuit of the primary MOS transistor switch M2, when M4 is on, M2 is not the vertical Ma Daotong, but the voltage in the capacitor is released from the C24 through R22 to the ground, when the voltage drops below the turn-off threshold of M2, M2 is turned on, and 5V_IN passes through the switching transistor to 5V_OUT.
When the secondary MOS tube M4 is turned off, the vertical horse is not turned off, but the capacitor C24 is charged by the 5V_IN through the series resistors R20 and R22, and when the charging voltage rises above the turn-off threshold of the M2, the M2 is turned off, and the 5V_IN cannot pass through the switch tube M2.
From the above analysis, the charging turn-off of M2 is started after M4 is completely turned off, so the turn-off time and turn-on time of M2 are both affected by the turn-off/turn-on time of M4.
As described above, if M4 is turned on to off, that is, the time taken by C28 to turn M4 off by discharging is T2, and M2 is turned on to off, that is, the time taken by C24 to turn M2 off by charging is T1, the time taken by M2 to finally achieve off is t1+t2. When the serial port is used as a normal communication channel at ordinary times, signals with alternately high and low levels are input, the duration of the low level in one period is T1, and the time duration of the low level in one period is T1, which is already disclosed, and T1+ T2 is far greater than T1, when the serial port inputs the signals with high and low levels, the serial port cannot shut down M2 anyway, so that the MCU serial port can be used as the normal communication channel to transmit the signals with high and low levels.
Meanwhile, when the power supply is to be turned off, the MCU serial port can continuously input a low level, and the time T2 is longer than T1+T2, so that the power supply can be turned off on the premise of not increasing the serial port.
The application can save the I/O port of the MCU under the condition of limited MCU resources, does not occupy the MCU resources, can realize the function of closing the power supply of the module under the condition of standardized interface between the watch and the module, can normally communicate with the serial port by the MCU when the power-off function is not used, and has the advantages of multiplexing the serial port function and the control power supply function of the MCU, simple circuit design and high reliability.
While embodiments of the invention have been shown and described, it will be understood by those skilled in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. The utility model provides a circuit that usable serial ports turn off power, the circuit includes power input (1), power output (2) and MCU serial ports (3), its characterized in that:
the circuit also comprises a first-stage turn-off module (4) which can be turned on or turned off by a charging and discharging mode to control the on-off of the power supply, and a second-stage turn-off module (5) which is connected with the first-stage turn-off module (4) and can influence the on-off time of the first-stage turn-off module (4) by the charging and discharging speed of the circuit to control the on-off of the power supply;
the primary turn-off module (4) is connected between the power input end (1) and the power output end (2), and the secondary turn-off module (5) is respectively connected with the MCU serial port (3), the power input end (1) and the primary turn-off module (4);
And the sum of the discharging time of the secondary turn-off module (5) and the charging time of the primary turn-off module (4) is larger than k times of the low-level duration t1 in one signal period when the MCU serial port (3) is used as a normal communication channel so as to ensure normal operation of the circuit, and smaller than the low-level duration t2 continuously input by the MCU serial port (3) when the power supply is turned off so as to ensure the realization of the power supply turn-off function.
2. The circuit for powering down with serial ports of claim 1, wherein:
The secondary turn-off module (5) comprises a pull-up resistor (R25) connected with the power input end (1), a secondary switch tube (M4) electrically connected with the pull-up resistor (R25) and the MCU serial port (3) respectively and turned on when the MCU serial port (3) inputs a high level, and an RCD charge-discharge module (51) arranged between the pull-up resistor (R25) and the secondary switch tube (M4) and charged when the secondary switch tube (M4) is turned on and capable of enabling the secondary switch tube (M4) to be turned off in a discharge mode when the MCU serial port (3) inputs a low level.
3. The circuit for powering down with serial ports of claim 1, wherein:
The primary turn-off module (4) comprises a primary switch tube (M2) connected between the power input end (1) and the power output end (2) for controlling the power on-off through self on-off, and an RC charge-discharge module (41) which is respectively connected with the primary switch tube (M2) and the secondary switch tube (M4) and enables the primary switch tube (M2) to be turned on in a discharge mode when the secondary switch tube (M4) is turned on and enables the primary switch tube (M2) to be turned off in a charging mode when the secondary switch tube (M4) is turned off.
4. The circuit for powering down with serial ports of claim 2, wherein:
The RCD charging and discharging module (51) comprises a secondary capacitor (C28) connected with a secondary switch tube (M4), a unidirectional flow guide component connected with a pull-up resistor (R25) and the secondary capacitor (C28) in series so as to charge the secondary capacitor (C28) when the secondary switch tube (M4) is conducted, and a secondary discharging resistor (R27) connected with the secondary capacitor (C28) and the MCU serial port (3) in series and used for discharging the secondary capacitor (C28) when the MCU serial port (3) continuously inputs low level, wherein the unidirectional flow guide component and the secondary discharging resistor (R27) are arranged in parallel.
5. The circuit for powering down using a serial port as recited in claim 4, wherein:
the unidirectional current guiding component is a diode (VD 7) which is connected in series between the pull-up resistor (R25) and the secondary capacitor (C28).
6. The circuit for powering down using a serial port as recited in claim 4, wherein:
The RCD charge-discharge module (51) further comprises a second resistor (R26) connected in series between the unidirectional current guiding component and the pull-up resistor (R25), the MCU serial port (3) is connected between the second resistor (R26) and the pull-up resistor (R25), and the resistance value of the secondary discharge resistor (R27) is larger than n times of that of the second resistor (R26).
7. A circuit for powering down a power supply using a serial port as recited in claim 3, wherein:
The RC charge-discharge module (41) comprises a primary capacitor (C24) which is connected with the primary switch tube (M2) and the secondary switch tube (M4) respectively and discharges when the secondary switch tube (M4) is turned on, a primary discharge resistor (R22) which is connected between the secondary switch tube (M4) and the primary switch tube (M2) in series and connected with the primary capacitor (C24) for discharging the primary capacitor (C24), and a primary charge resistor (R20) which is connected between the power input end (1) and the primary capacitor (C24) and is used for charging the primary capacitor (C24) when the secondary switch tube (M4) is turned off.
8. The circuit for powering down using a serial port as recited in claim 7, wherein:
One end of the primary capacitor (C24) is connected between the power input end (1) and the primary switch tube (M2), and the other end of the primary capacitor is connected between the primary switch tube and the primary bleeder resistor;
One end of the primary charging resistor is connected between the secondary switch tube and the primary discharging resistor, and the other end of the primary charging resistor is connected between the power input end (1) and the primary capacitor (C24).
9. The circuit for powering down using a serial port as recited in claim 8, wherein:
The resistance value of the primary charging resistor (R20) is m times larger than that of the primary discharging resistor (R22).
10. A circuit for powering down a power supply using a serial port as recited in claim 3, wherein:
The primary switching tube (M2) is a P-channel enhancement type MOS tube, and the secondary switching tube (M4) is an N-channel enhancement type MOS tube.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111164015.8A CN114237079B (en) | 2021-09-30 | 2021-09-30 | Circuit capable of utilizing serial port to turn off power supply |
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| CN202111164015.8A CN114237079B (en) | 2021-09-30 | 2021-09-30 | Circuit capable of utilizing serial port to turn off power supply |
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| 微细电火花加工脉冲电源及控制系统研究;刘祥发;《中国优秀硕士学位论文全文数据库》;20180215;全文 * |
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