CN104199752B - Failure recovery circuit and device - Google Patents
Failure recovery circuit and device Download PDFInfo
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- CN104199752B CN104199752B CN201410440265.3A CN201410440265A CN104199752B CN 104199752 B CN104199752 B CN 104199752B CN 201410440265 A CN201410440265 A CN 201410440265A CN 104199752 B CN104199752 B CN 104199752B
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Abstract
The embodiment of the invention provides a failure recovery circuit and device and relates to the field of electronic equipment. The failure recovery circuit and device are used for achieving recovery of an SD card automatically through a main controller, so that the failure recovery time of the electronic equipment is shortened. According to the failure recovery circuit, the input end of a voltage dividing unit is connected with a direct-current power supply, the output end of the voltage dividing unit is connected with the input end of a signal output unit, the first output end of the signal output unit is connected with the main controller, and the second output end of the signal output unit is connected with the control end of a first switch unit; the output end of the first switch unit is connected with the SD card, the input end of the first switch unit is connected with the direct-current power supply, the control end of a second switch unit is connected with the first output end or the second output end of the signal output unit, the input end of the second switch unit is connected with the main controller, and the output end of the second switch unit is connected with the SD card; the signal output unit is used for controlling the first switch unit and the second switch unit to be switched off within a predetermined period of time and controlling the main controller to reset, and the signal output unit is also used for controlling the first switch unit and the second switch unit to be switched on at the predetermined time and controlling the main controller to be started.
Description
Technical field
The present invention relates to electronic device field, more particularly to a kind of fault recovery circuit and device.
Background technology
SD card (Secure Digital Memory Card, safe digital card) is a kind of based on quasiconductor fast-flash memory device
Memory device of new generation, be widely used in various electronic equipments.In the electronic device, master controller is connected with SD card,
Master controller is initialized to SD card in start or restarting process, and loads the driver of SD card, so that main control
Device the operation such as can be written and read, so as to complete the communication of master controller and SD card after starting shooting or restarting to SD card.In SD card
In the case of there is exception, master controller generally sends reset instruction to SD card, so that the control module of SD card is being received
During this reset instruction, the operation that resets is performed, and reset response message is sent to master controller, so as to complete master controller to SD card
Recovery.But, cause voltage after falling to be less than when being supplied to the direct current power source voltage of SD card and master controller instantaneously to fall
In SD card during voltage needed for control module normal work, this control module cannot work, so as to None- identified master controller is sent out
The reset instruction sent, and then the operation that resets also is not carried out, so as to cause recovery of the master controller to SD card to fail.
In the prior art, if due to direct current power source voltage instantaneously fall cause control module in SD card abnormal when,
Operator are needed to carry out power-off manually to electronic equipment, and when direct current power source voltage is stable, then electron equipment is supplied again
Electricity, so that electronic equipment is reopened, as electronic equipment is during reopening, its built-in master controller and SD card
Restarting is both needed to, and master controller is initialized to SD card in restarting procedure, i.e., reset command is sent to SD card,
Now, as the control module in SD card is powered normally, then reset response message is sent to master controller, so that main control
Device completes the initialization procedure to SD card, and after initialization is completed, the driver of loading SD card, so as to complete master controller
Recovery to SD card.
But during above-mentioned realization, when direct current power source voltage instantaneously falls causes the control module in SD card abnormal,
Need operator to reopen to electronic equipment manually and can just complete recovery of the master controller to SD card, so, when in SD
When control module is abnormal, if operator do not find in time or not at the scene when, being required to take some time could be to electricity
Sub- equipment is reopened, and completes recovery of the master controller to SD card so that the failure recovery time of electronic equipment compared with
It is long.
The content of the invention
Embodiments of the invention provide a kind of fault recovery circuit and device, for being automatically performed master controller to SD card
Recover, so as to reduce the failure recovery time of electronic equipment.
To reach above-mentioned purpose, embodiments of the invention are adopted the following technical scheme that：
The embodiment of the present invention provides a kind of fault recovery circuit, including：Master controller, SD card, partial pressure unit, signal output
Unit, first switch unit and second switch unit；The input of the partial pressure unit is connected with DC source, outfan and institute
State the input connection of signal output unit；First outfan of the signal output unit is connected with the master controller, the
Two outfans are connected with the control end of the first switch unit；The outfan of the first switch unit is connected with the SD card
Connect, input is connected with the DC source；The control end of the second switch unit and the first of the signal output unit
Outfan or the connection of the second outfan, input are connected with the master controller, and outfan is connected with the SD card；The signal
Output unit, the voltage for exporting in the partial pressure unit are less than the given voltage of the input of the signal output unit
When, the first switch unit is controlled in Preset Time and the second switch unit disconnects, and control the master controller
Reset；Wherein, the time that the Preset Time is discharged completely more than the SD card；The signal output unit, is additionally operable to true
When reaching the Preset Time surely, the first switch unit and second switch unit conducting are controlled, and controls the master
Controller is opened.
Optionally, the signal output unit includes：First reset unit；First outfan of first reset unit
It is connected with the master controller, the second outfan is connected with the control end of the first switch unit；The second switch unit
Control end be connected with first outfan or the second outfan of first reset unit.
Optionally, the signal output unit includes：Second reset unit and phase inverter；Second reset unit it is defeated
Enter end to be connected with the outfan of the partial pressure unit, outfan is connected with the input of the phase inverter；The phase inverter it is defeated
Go out first outfan of the end for the signal output unit, the outfan of second reset unit is the signal output unit
The second outfan；Or；The outfan of the phase inverter is the second outfan of the signal output unit, and described second is multiple
The outfan of position signal is the first outfan of the signal output unit.
Optionally, the fault recovery circuit also includes：First resistor unit；The first end of the first resistor unit with
The DC source connection, the second end is connected with the control end of the first switch unit.
Optionally, the fault recovery circuit also includes：Second resistance unit；Second end of the first resistor unit leads to
The control end that the second resistance unit is crossed with the first switch unit is connected.
Optionally, the partial pressure unit includes：3rd resistor unit and the 4th resistance unit；The 3rd resistor unit
First end is connected with the DC source, the second end first end and the signal output list respectively with the 4th resistance unit
The input connection of unit；The second end ground connection of the 4th resistance unit.
Optionally, the first switch unit includes：P-channel-metal oxide semiconductor field effect tube PMOS.
The embodiment of the present invention provides a kind of local fault recovery device, including the fault recovery circuit described in above-described embodiment.
A kind of fault recovery circuit provided in an embodiment of the present invention and device, wherein, fault recovery circuit includes：Main control
Device, SD card, partial pressure unit, signal output unit, first switch unit and second switch unit, when the input with partial pressure unit
The voltage sag of the DC source of connection, and cause the voltage of the outfan of partial pressure unit defeated less than signal output unit
When entering the given voltage at end, signal output unit in Preset Time controls master controller and resets, i.e., master controller does not work；And
Control first switch unit and second switch unit disconnect, so that SD card power-off, i.e. SD card are discharged, due to setting
The time that Preset Time is discharged completely more than SD card, so can ensure that SD card can be discharged completely in Preset Time, and by
Disconnect in second switch unit, so master controller is separated with SD card, i.e., does not exist
Holding wire feed, it is possible to be further ensured that SD card is discharged completely；When Preset Time is reached, the voltage of DC source
Normally, the first outfan control master controller of signal output unit is opened, meanwhile, the second outfan control of signal output unit
First switch unit processed and the conducting of second switch unit, then the control module in SD card is powered normally, and master controller is being opened
During, SD card is initialized, i.e., reset command is sent to SD card, now, as the control module in SD card is powered
Normally, then control module in SD card is sent to reset to master controller and is rung when the reset command of master controller transmission is received
Message is answered, so that master controller completes the initialization procedure to SD card, and the driving of SD card after initialization is completed, is loaded
Program, can be with SD card proper communication so as to complete recovery of the master controller to SD card, i.e. master controller.In the process, when
When the voltage sag of DC source causes the control module in SD card abnormal, the present invention is examined automatically by signal output unit
The output voltage of partial pressure unit is surveyed, when the voltage of the outfan of partial pressure unit is less than the set electricity of the input of signal output unit
During pressure, then automatically control first switch unit, the break-make of second switch unit, and the reset of master controller and open, so as to complete
Into recovery of the master controller to SD card, without the intervention of operator, so as to reduce the failure recovery time of electronic equipment.
Description of the drawings
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, below will be in embodiment or description of the prior art
The required accompanying drawing for using is briefly described, it should be apparent that, drawings in the following description are only some realities of the present invention
Example is applied, for those of ordinary skill in the art, on the premise of not paying creative work, can be with according to these accompanying drawings
Obtain other accompanying drawings.
Fig. 1 is a kind of schematic diagram of fault recovery circuit provided in an embodiment of the present invention；
Fig. 2 is the schematic diagram of another kind of fault recovery circuit provided in an embodiment of the present invention；
Fig. 3 is the schematic diagram of another kind of fault recovery circuit provided in an embodiment of the present invention；
Fig. 4 is the schematic diagram of another kind of fault recovery circuit provided in an embodiment of the present invention；
Fig. 5 is the schematic diagram of another kind of fault recovery circuit provided in an embodiment of the present invention；
Fig. 6 is the schematic diagram of another kind of fault recovery circuit provided in an embodiment of the present invention；
Fig. 7 is the schematic diagram of another kind of fault recovery circuit provided in an embodiment of the present invention；
Fig. 8 is the schematic diagram of another kind of fault recovery circuit provided in an embodiment of the present invention；
Schematic diagrams of the Fig. 9 for a kind of partial pressure unit circuit in the fault recovery circuit shown in Fig. 1；
Figure 10 is the schematic diagram of another kind of fault recovery circuit provided in an embodiment of the present invention；
Figure 11 is the schematic diagram of another kind of fault recovery circuit provided in an embodiment of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than the embodiment of whole.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
The embodiment of the present invention provides a kind of fault recovery circuit, including：Master controller 101, SD card (Secure Digital
Memory Card, safe digital card) 102, partial pressure unit 103, signal output unit 104, first switch unit 105 and second
Switch element 106.
The input of the partial pressure unit 103 is connected with DC source, and outfan is defeated with the signal output unit 104
Enter end connection；First outfan of the signal output unit 104 is connected with the master controller 101, the second outfan and institute
State the control end connection of first switch unit 105；The outfan of the first switch unit 105 is connected with the SD card 102, defeated
Enter end to be connected with the DC source；The control end of the second switch unit 106 and the first of the signal output unit 104
Outfan or the connection of the second outfan, input are connected with the master controller 101, and outfan is connected with the SD card 102.
It should be noted that exporting with the first of the signal output unit 104 in the control end of second switch unit 106
During the connection of end, the fault recovery circuit is as shown in Figure 1；In the control end and the signal output list of second switch unit 106
When second outfan of unit 104 connects, the fault recovery circuit is as shown in Figure 2.
The signal output unit 104, the voltage for exporting in the partial pressure unit 103 are less than the signal output list
During the given voltage of the input of unit 104, the first switch unit 105 and the second switch list are controlled in Preset Time
Unit 106 disconnects, and controls the master controller 101 and reset.
Wherein, the time that the Preset Time is discharged completely more than the SD card.
The signal output unit 104, is additionally operable to, when it is determined that reaching the Preset Time, control the first switch list
Unit 105 and the second switch unit 106 are turned on, and are controlled the master controller 101 and opened.
It should be noted that in Preset Time, the signal of the first outfan output of signal output unit 104 is high electricity
Ordinary mail number, the signal of the second outfan output is low level signal.When Preset Time is reached, the of signal output unit 104
The signal of one outfan output is low level signal, and the signal of the second outfan output is high level signal.Second switch unit
106 switch elements disconnected when can be and receive high level signal, or opening of disconnecting when receiving low level signal
Close unit.
In the case of the switch element disconnected when second switch unit 106 is to receive high level signal, second switch
The control end of unit 106 is connected with the second outfan of signal output unit 104.
In the case of the switch element disconnected when second switch unit 106 is to receive low level signal, second switch
The control end of unit 106 is connected with the first outfan of signal output unit 104.
Specifically, the feelings being connected with the first outfan of signal output unit 104 in the control end of second switch unit 106
Under condition, when the voltage sag of the DC source that the input with partial pressure unit 103 is connected, and cause partial pressure unit 103
During the given voltage of the input that the voltage of outfan output is less than signal output unit 104, the first of signal output unit 104
Outfan exports the low level signal of Preset Time, i.e., be always maintained at exporting low level signal, the second output in Preset Time
High level signal in end output Preset Time, i.e., export high level signal, in Preset Time always due to signal output list
Unit 104 the first outfan be connected with the control end and master controller 101 of second switch unit 106 respectively, the second outfan with
The control end connection of first switch unit 105, then master controller 101 and second switch unit 106 can receive low level letter
Number, and master controller 101 resetted when low level signal is received, second switch unit 106 is receiving low level letter
Number when disconnect, as master controller 101 is connected with SD card 102 by second switch unit 106, and second switch unit 106 this
When be off, so master controller 101 is not connected to SD card 102, i.e. letter between master controller 101 and SD card 102
Number line disconnects, so there is no feed in holding wire, and then also will not feed be input into into SD card 102.And first switch list
The control end of unit 105 can receive high level signal, and disconnect when high level signal is received, and as SD card 102 is led to
Cross first switch unit 105 to be connected with DC voltage, and now first switch unit 105 is off, so SD card 102
Without supply voltage, in off-position, that is, start electric discharge, and the Preset Time for setting more than the time that SD card is discharged completely,
So in Preset Time, it is ensured that SD card can be discharged completely.
When signal output unit 104 determines reaches Preset Time, high level signal is exported in the first outfan, second
Outfan exports low level signal, so that master controller 101 is opened, first switch unit 105 and second switch unit 106
Conducting, so, DC source is connected with SD card 102, so that the control module in SD card 102 is powered normally, master controller
101 initialize to SD card 102 in opening process, i.e., send reset command to SD card 102, now, due in SD card 102
Control module power normally, then the control module in SD card 102 can receive master controller 101 transmission reset command,
And when this reset command is received, the operation that resets is performed, and after the operation that resets has been performed, send multiple to master controller 101
Position response message, so that main controller 101 is when it is determined that this reset response message is correct, it is determined that to the initial of SD card 102
Chemical conversion work(, and the driver of SD card 102 is further loaded, and as second switch unit 106 is turned on, so master controller
101 are connected with SD card 102 so that master controller 101 and SD card 102 can proper communication, complete master controller 101 pairs
The recovery of SD card 102.
In the case where the control end of second switch unit 106 is connected with the second outfan of signal output unit 104, its
Specific operation principle is connected with the first outfan of signal output unit 104 with the control end in second switch unit 106
In the case of operation principle be similar to, refer to above-mentioned operation principle, the present invention will not be described here.
It should be noted that signal output unit 104 is built-in with intervalometer, for carrying out timing to Preset Time, i.e., really
The first outfan for protecting signal output unit 104 exports low level signal in Preset Time, and the second outfan is in Preset Time
Interior output high level signal, when Preset Time is reached, it is ensured that the first outfan of signal output unit 104 is in Preset Time
Output high level signal, the second outfan export low level signal in Preset Time.
Optionally, first switch unit 105 includes：PMOS(P-Metal-Oxide-Semicond-uctor-Field-
EffectTransistor, p-type-Metal-oxide-semicondutor-field-effect transistor).
It should be noted that first switch unit 105 can also be other that disconnect when high level signal is received opening
Unit is closed, the present invention is without limitation.
The embodiment of the present invention provides a kind of fault recovery circuit, including：Master controller, SD card, partial pressure unit, signal output
Unit, first switch unit and second switch unit, when the voltage transient of the DC source that the input with partial pressure unit is connected
Fall, and cause partial pressure unit outfan voltage less than signal output unit input given voltage when, signal is defeated
Go out unit and master controller reset is controlled in Preset Time, i.e., master controller does not work；And control first switch unit and second
Switch element disconnects, so that SD card power-off, i.e. SD card are discharged, as the Preset Time for setting is put completely more than SD card
The time of electricity, so can ensure that SD card can be discharged completely in Preset Time, and as second switch unit disconnects, so
Master controller is separated with SD card, i.e., the feed that there is no the holding wire connected between master controller and SD card, it is possible to
It is further ensured that SD card is discharged completely；When Preset Time is reached, the voltage of DC source is normal, and the first of signal output unit
Outfan control master controller is opened, meanwhile, the second outfan of signal output unit control first switch unit and second open
Unit conducting is closed, then the control module in SD card is powered normally, and master controller is during unlatching, and SD card is carried out initially
Change, i.e., reset command, now, as the control module in SD card is powered normally, the then control module in SD card are sent to SD card
When the reset command of master controller transmission is received, reset response message is sent to master controller, so that master controller
The initialization procedure to SD card is completed, and after initialization is completed, the driver of loading SD card, so as to complete master controller pair
The recovery of SD card, i.e. master controller can be with SD card proper communications.In the process, when the voltage sag of DC source is led
When causing the control module in SD card abnormal, output voltage of the present invention by signal output unit automatic detection partial pressure unit, when
When the voltage of the outfan of partial pressure unit is less than the given voltage of the input of signal output unit, then first switch is automatically controlled
Unit, the break-make of second switch unit, and the reset of master controller and unlatching, so as to complete recovery of the master controller to SD card,
Without the intervention of operator, so as to reduce the failure recovery time of electronic equipment.
Further, the signal output unit 104 includes：First reset unit 1041.
First outfan of first reset unit 1041 is connected with the master controller 101, the second outfan and institute
State the control end connection of first switch unit 105；The control end of the second switch unit 106 and first reset unit
1041 the first outfan or the connection of the second outfan.
It should be noted that in the control end and the of first reset unit 1041 of the second switch unit 106
When one outfan connects, the fault recovery circuit is as shown in Figure 3；The second switch unit 106 control end with it is described
When second outfan of the first reset unit 1041 connects, the fault recovery circuit is as shown in Figure 4.
That is, the first outfan of the first reset unit 1041 is the first outfan of signal output unit 104；
Second outfan of the first reset unit 1041 is the second outfan of signal output unit 104.
It should be noted that the first reset unit 1041 can be integrated reset chip；Can also be by electronics unit device
The circuit of part composition, the present invention are without limitation.
Or, the signal output unit 104 includes：Second reset unit 1042 and phase inverter 1043.
The input of second reset unit 1042 is connected with the outfan of the partial pressure unit 103；Outfan and institute
State the input connection of phase inverter 1043；The outfan of the phase inverter 1043 is the first defeated of the signal output unit 104
Go out end, the outfan of second reset unit 1042 is the second outfan of the signal output unit 104.
Or, the outfan of the phase inverter 1043 is the second outfan of the signal output unit 104, described second
The outfan of reset signal 1042 is the first outfan of the signal output unit 104.
It should be noted that the second reset unit 1042 can be integrated reset chip；Can also be by electronics unit device
The circuit of part composition.Phase inverter 1043 can be the circuit constituted using not gate logical device, it is also possible to by CPLD
(Complex Programmable Logic Device, CPLD) realizing, the present invention is not limited to this
System.
It should be noted that including the situation of the second reset unit 1042 and phase inverter 1043 in signal output unit 104
Under, the connected mode of fault recovery circuit includes four kinds, concrete such as Fig. 5, shown in Fig. 6, Fig. 7 and Fig. 8.
It should be noted that when the voltage sag of the DC source being connected with the input of partial pressure unit 103, and lead
During the given voltage of the input that the voltage of the outfan output of cause partial pressure unit 103 is less than the second reset unit 1042, in Fig. 5
Under shown connected mode, the signal that the outfan of the second reset unit 1042 is exported in Preset Time is low level signal,
Second switch unit 106 is the switch element disconnected when high level signal is received.Under the connected mode shown in Fig. 6, the
The signal that the outfan of two reset units 1042 is exported in Preset Time is low level signal, second switch unit 106 be
Receive the switch element disconnected during low level signal.Under the connected mode shown in Fig. 7, the output of the second reset unit 1042
The signal that end is exported in Preset Time is high level signal, and second switch unit 106 is to break when high level signal is received
The switch element opened.Under the connected mode shown in Fig. 8, what the outfan of the second reset unit 1042 was exported in Preset Time
Signal is high level signal, and second switch unit 106 is the switch element disconnected when low level signal is received.
It should be noted that the operation principle of the circuit shown in Fig. 5, Fig. 6, Fig. 7 and Fig. 8 is similar to, below only with shown in Fig. 5
Circuit as a example by illustrate its specific operation principle.
The concrete operating principle of the circuit shown in Fig. 5 is：The DC source being connected when the input with partial pressure unit 103
Voltage sag, and cause input of the voltage that the outfan of partial pressure unit 103 is exported less than the second reset unit 1042
Given voltage when, the second reset unit 1042 outfan output Preset Time in low level signal so that master controller
101 receive reset after this low level signal, and the low level signal of the outfan output of the second reset unit 1042 is inverted
Device 1043 is converted to high level signal, due to phase inverter 1043 outfan respectively with the control end of first switch unit 105 and
The control end connection of second switch unit 106, then can show that the control end of first switch unit 105 receives is high level
Signal, so that first switch unit 105 disconnects, i.e. the input of first switch unit 105 and first switch unit 105
Outfan is not turned on, so 102 unpowered voltage of SD card, in off-position, now, SD card 102 starts electric discharge, and due to setting
The time that fixed Preset Time is discharged completely more than SD card 102, so in Preset Time, it is ensured that SD card 102 can be complete
It is complete to discharge.Further, it is off when receiving high level signal due to the control end of second switch unit 106, then
Main controller 101 is made to be not connected to SD card 102, i.e., the holding wire between master controller 101 and SD card 102 disconnects, so letter
There is no feed in number line, so also will not feed input into SD card 102, so as to be further ensured that SD card in Preset Time
It is interior to discharge completely.
When the second reset unit 1042 determines reaches Preset Time, high level signal is exported in the first outfan, the
Two outfans export low level signal, so that master controller 101 is opened, first switch unit 105 and second switch unit
106 conductings, so, DC source is connected with SD card 102, so that the control module in SD card 102 is powered normally, main control
Device 101 is initialized to SD card 102 in opening process, i.e., send reset command to SD card 102, now, due to SD card 102
Interior control module is powered normally, then the control module in SD card 102 can receive the reset life of the transmission of master controller 101
Order, and when this reset command is received, perform the operation that resets, and after the operation that resets has been performed, send to master controller 101
Reset response message, so that main controller 101 is when it is determined that this reset response message is correct, it is determined that to the first of SD card 102
Begin chemical conversion work(, and further loads the driver of SD card 102, and as second switch unit 106 is turned on, so master controller
101 are connected with SD card 102 so that master controller 101 and SD card 102 can proper communication, complete master controller 101 pairs
The recovery of SD card 102.
Further, as shown in figure 9, the partial pressure unit 103 includes：3rd resistor unit 1031 and the 4th resistance unit
1032。
The first end of the 3rd resistor unit 1031 is connected with the DC source, and the second end is electric with the described 4th respectively
The input connection of the first end and the signal output unit 104 of resistance unit 1032；The of 4th resistance unit 1032
Two ends are grounded.
Specifically, as 3rd resistor unit 1031 is connected with the 4th resistance unit 1032, then flow through 3rd resistor unit
1031 and the 4th resistance unit 1032 electric current it is identical so that 3rd resistor unit 1031 and the 4th resistance unit 1032 will
The voltage of DC source is divided into two parts, and as the second end of the 4th resistance unit 1032 is grounded, then by the 4th resistance unit
The input of the voltage output at 1032 two ends to signal output unit 104.
Further, as shown in Figure 10, the fault recovery circuit also includes：First resistor unit 107.
The first end of the first resistor unit 107 is connected with the DC source, the second end and the first switch list
The control end connection of unit 105.
Specifically, when the second outfan of signal output unit 104 does not export any signal, in order to ensure first switch
Unit 105 is remained off, then in the control end connection pull-up resistor of first switch unit 105, that is, connect first resistor list
Unit 107, as the first end of first resistor unit is connected with DC source, so second in signal output unit 104 exports
When end does not export any signal, first resistor unit 107 ensure that the control end of first switch unit 105 receives high level
Signal, it is possible to ensure that first switch unit 105 is off.
It should be noted that the connected mode in Figure 10 is with the outfan of phase inverter 1043 as signal output unit 104
The second outfan, and be attached as a example by the control end of second switch unit 106 is connected with the outfan of phase inverter 1043.
Further, as shown in figure 11, the fault recovery circuit also includes：Second resistance unit 108.
Second end of the first resistor unit 107 is by the second resistance unit 108 and the first switch unit
105 control end connection.
It should be noted that the connected mode in Figure 11 is with the outfan of phase inverter 1043 as signal output unit 104
The second outfan, and be attached as a example by the control end of second switch unit 106 is connected with the outfan of phase inverter 1043.
Wherein, 108 metering functions of second resistance unit, prevent the electric current for flowing into first switch unit 105 excessive and burn
Bad first switch unit 105.
The embodiment of the present invention provides a kind of fault recovery circuit, including：Master controller, SD card, partial pressure unit, signal output
Unit, first switch unit and second switch unit, when the voltage transient of the DC source that the input with partial pressure unit is connected
Fall, and cause partial pressure unit outfan voltage less than signal output unit input given voltage when, signal is defeated
Go out unit and master controller reset is controlled in Preset Time, i.e., master controller does not work；And control first switch unit and second
Switch element disconnects, so that SD card power-off, i.e. SD card are discharged, as the Preset Time for setting is put completely more than SD card
The time of electricity, so can ensure that SD card can be discharged completely in Preset Time, and as second switch unit disconnects, so
Master controller is separated with SD card, i.e., the feed that there is no the holding wire connected between master controller and SD card, it is possible to
It is further ensured that SD card is discharged completely；When Preset Time is reached, the voltage of DC source is normal, and the first of signal output unit
Outfan control master controller is opened, meanwhile, the second outfan of signal output unit control first switch unit and second open
Unit conducting is closed, then the control module in SD card is powered normally, and master controller is during unlatching, and SD card is carried out initially
Change, i.e., reset command, now, as the control module in SD card is powered normally, the then control module in SD card are sent to SD card
When the reset command of master controller transmission is received, reset response message is sent to master controller, so that master controller
The initialization procedure to SD card is completed, and after initialization is completed, the driver of loading SD card, so as to complete master controller pair
The recovery of SD card, i.e. master controller can be with SD card proper communications.In the process, when the voltage sag of DC source is led
When causing the control module in SD card abnormal, output voltage of the present invention by signal output unit automatic detection partial pressure unit, when
When the voltage of the outfan of partial pressure unit is less than the given voltage of the input of signal output unit, then first switch is automatically controlled
Unit, the break-make of second switch unit, and the reset of master controller and unlatching, so as to complete recovery of the master controller to SD card,
Without the intervention of operator, so as to reduce the failure recovery time of electronic equipment.
The embodiment of the present invention provides a kind of local fault recovery device, including the fault recovery circuit described in above-described embodiment.
The embodiment of the present invention provides a kind of local fault recovery device, including fault recovery circuit, and fault recovery circuit includes
Master controller, SD card, partial pressure unit, signal output unit, first switch unit and second switch unit, when with partial pressure unit
The voltage sag of the DC source of input connection, and cause the voltage of the outfan of partial pressure unit to be less than signal output list
During the given voltage of the input of unit, signal output unit controls master controller reset, i.e. master controller not in Preset Time
Work；And control first switch unit and second switch unit and disconnect, so that SD card power-off, i.e. SD card are discharged, by
It is more than the time that SD card is discharged completely in the Preset Time of setting, so can ensure that in Preset Time SD card can be put completely
Electricity, and as second switch unit disconnects, so master controller is separated with SD card, i.e., do not exist master controller and SD card it
Between the feed of holding wire that connects, it is possible to be further ensured that SD card is discharged completely；When Preset Time is reached, DC source
Voltage it is normal, the first outfan control master controller of signal output unit is opened, meanwhile, the second of signal output unit is defeated
Go out end control first switch unit and the conducting of second switch unit, then the control module in SD card is powered normally, and master controller
During unlatching, SD card is initialized, i.e., reset command is sent to SD card, now, due to the control mould in SD card
Block is powered normally, then the control module in SD card is sent to master controller when the reset command of master controller transmission is received
Reset response message, so that master controller completes the initialization procedure to SD card, and after initialization is completed, loads SD card
Driver, can be with SD card proper communication so as to complete recovery of the master controller to SD card, i.e. master controller.In this process
In, when the voltage sag of DC source causes the control module in SD card abnormal, the present invention passes through signal output unit
The output voltage of automatic detection partial pressure unit, when the voltage of the outfan of partial pressure unit is less than the input of signal output unit
During given voltage, then automatically control first switch unit, the break-make of second switch unit, and the reset of master controller and open,
So as to complete recovery of the master controller to SD card, without the intervention of operator, so as to the failure for reducing electronic equipment is extensive
The multiple time.
Should be noted be the above each resistance unit can be that the combination of one or more devices is realized, i.e., any of the above-described electricity
Resistance unit can include at least one resistance, when at least two resistance is included in any of the above-described resistance unit, the resistance list
Resistance in unit can be with parallel, or series connection, and the size of the resistance can be fixed, or change
's.
In several embodiments provided herein, it should be understood that disclosed system, apparatus and method can be with
Realize by another way.For example, device embodiment described above is only schematic, for example, the unit
Divide, only a kind of division of logic function can have other dividing mode, such as multiple units or component when actually realizing
Can with reference to or be desirably integrated into another system, or some features can be ignored, or not perform.It is another, it is shown or
The coupling each other for discussing or direct-coupling or communication connection can be the indirect couplings by some interfaces, device or unit
Close or communicate to connect, can be electrical, mechanical or other forms.
The unit as separating component explanation can be or may not be it is physically separate, it is aobvious as unit
The part for showing can be or may not be physical location, you can local to be located at one, or can also be distributed to multiple
On NE.Some or all of unit therein can be selected according to the actual needs to realize the mesh of this embodiment scheme
's.
In addition, each functional unit in each embodiment of the invention can be integrated in a processing unit, it is also possible to
It is that the independent physics of unit includes, it is also possible to which two or more units are integrated in a unit.Above-mentioned integrated list
Unit both can be realized in the form of hardware, it would however also be possible to employ hardware adds the form of SFU software functional unit to realize.
The above-mentioned integrated unit realized in the form of SFU software functional unit, can be stored in an embodied on computer readable and deposit
In storage media.Above-mentioned SFU software functional unit is stored in a storage medium, is used so that a computer including some instructions
Equipment (can be personal computer, server, or network equipment etc.) performs the portion of each embodiment methods described of the invention
Step by step.And aforesaid storage medium includes：USB flash disk, portable hard drive, read only memory (Read-Only Memory, abbreviation
ROM), random access memory (Random Access Memory, abbreviation RAM), magnetic disc or CD etc. are various can store
The medium of program code.
Finally it should be noted that：Above example only to illustrate technical scheme, rather than a limitation；Although
With reference to the foregoing embodiments the present invention has been described in detail, it will be understood by those within the art that：Which still may be used
To modify to the technical scheme described in foregoing embodiments, or equivalent is carried out to which part technical characteristic；
And these modification or replace, do not make appropriate technical solution essence depart from various embodiments of the present invention technical scheme spirit and
Scope.
Claims (12)
1. a kind of fault recovery circuit, including master controller and safe digital card SD card, it is characterised in that also include：Partial pressure list
Unit, signal output unit, first switch unit and second switch unit；
The input of the partial pressure unit is connected with DC source, and outfan is connected with the input of the signal output unit；
First outfan of the signal output unit is connected with the master controller, the second outfan and the first switch unit
Control end connects；The outfan of the first switch unit is connected with the SD card, and input is connected with the DC source；Institute
State the control end of second switch unit to be connected with the first outfan of the signal output unit or the second outfan, input with
The master controller connection, outfan are connected with the SD card；
The signal output unit, the voltage for exporting in the partial pressure unit are less than the input of the signal output unit
Given voltage when, the first switch unit and the second switch unit are controlled in Preset Time and are disconnected, and control institute
State master controller reset；Wherein, the time that the Preset Time is discharged completely more than the SD card；
The signal output unit, is additionally operable to, when it is determined that reaching the Preset Time, control the first switch unit and institute
The conducting of second switch unit is stated, and controls the master controller and opened.
2. fault recovery circuit according to claim 1, it is characterised in that the signal output unit includes：First is multiple
Bit location；
First outfan of first reset unit is connected with the master controller, the second outfan and the first switch list
The control end connection of unit；The control end of the second switch unit is defeated with the first outfan of first reset unit or second
Go out end connection.
3. fault recovery circuit according to claim 1, it is characterised in that the signal output unit includes：Second is multiple
Bit location and phase inverter；
The input of second reset unit is connected with the outfan of the partial pressure unit, and outfan is defeated with the phase inverter
Enter end connection；The outfan of the phase inverter is the first outfan of the signal output unit, second reset unit
Outfan is the second outfan of the signal output unit；Or；
The outfan of the phase inverter is the second outfan of the signal output unit, the outfan of second reset signal
For the first outfan of the signal output unit.
4. the fault recovery circuit according to any one of claim 1-3, it is characterised in that the fault recovery circuit is also wrapped
Include：First resistor unit；
The first end of the first resistor unit is connected with the DC source, the control of the second end and the first switch unit
End connection.
5. fault recovery circuit according to claim 4, it is characterised in that the fault recovery circuit also includes：Second
Resistance unit；
Control end of second end of the first resistor unit by the second resistance unit with the first switch unit connects
Connect.
6. the fault recovery circuit according to claim 1-3,5 any one, it is characterised in that the partial pressure unit includes：
3rd resistor unit and the 4th resistance unit；
The first end of the 3rd resistor unit is connected with the DC source, the second end respectively with the 4th resistance unit
The input connection of first end and the signal output unit；The second end ground connection of the 4th resistance unit.
7. the fault recovery circuit according to claim 1-3,5 any one, it is characterised in that the first switch unit bag
Include:P-channel-metal oxide semiconductor field effect tube PMOS.
8. fault recovery circuit according to claim 4, it is characterised in that the partial pressure unit includes：3rd resistor list
Unit and the 4th resistance unit；
The first end of the 3rd resistor unit is connected with the DC source, the second end respectively with the 4th resistance unit
The input connection of first end and the signal output unit；The second end ground connection of the 4th resistance unit.
9. fault recovery circuit according to claim 4, it is characterised in that the first switch unit includes:P-channel-
Metal oxide semiconductor field effect tube PMOS.
10. fault recovery circuit according to claim 6, it is characterised in that the first switch unit includes:P-channel-
Metal oxide semiconductor field effect tube PMOS.
11. fault recovery circuits according to claim 8, it is characterised in that the first switch unit includes:P-channel-
Metal oxide semiconductor field effect tube PMOS.
12. a kind of local fault recovery devices, it is characterised in that including the fault recovery circuit described in any one of claim 1-11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410440265.3A CN104199752B (en) | 2014-08-29 | 2014-08-29 | Failure recovery circuit and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410440265.3A CN104199752B (en) | 2014-08-29 | 2014-08-29 | Failure recovery circuit and device |
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| Publication Number | Publication Date |
|---|---|
| CN104199752A CN104199752A (en) | 2014-12-10 |
| CN104199752B true CN104199752B (en) | 2017-04-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410440265.3A Active CN104199752B (en) | 2014-08-29 | 2014-08-29 | Failure recovery circuit and device |
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| Country | Link |
|---|---|
| CN (1) | CN104199752B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109188980A (en) * | 2018-09-29 | 2019-01-11 | 北京聚利科技股份有限公司 | The power control method and card reader of card reader |
| CN110381196B (en) * | 2019-06-17 | 2022-04-26 | 深圳盈达机器视觉技术有限公司 | Control method for falling protection of mobile device and mobile device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1127444A (en) * | 1994-07-12 | 1996-07-24 | 通用仪器公司 | Power-out reset system |
| CN201332261Y (en) * | 2008-12-30 | 2009-10-21 | 中国移动通信集团河南有限公司 | Reset device |
| CN102447455A (en) * | 2010-10-07 | 2012-05-09 | 鸿富锦精密工业（深圳）有限公司 | Reset signal discharge circuit |
| CN202978866U (en) * | 2012-11-27 | 2013-06-05 | 福建鑫诺通讯技术有限公司 | A reuse switch circuit for starting a SD card and resetting equipment with the SD card |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100530039C (en) * | 2006-06-02 | 2009-08-19 | 鸿富锦精密工业（深圳）有限公司 | Computer system reset device |
-
2014
- 2014-08-29 CN CN201410440265.3A patent/CN104199752B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1127444A (en) * | 1994-07-12 | 1996-07-24 | 通用仪器公司 | Power-out reset system |
| CN201332261Y (en) * | 2008-12-30 | 2009-10-21 | 中国移动通信集团河南有限公司 | Reset device |
| CN102447455A (en) * | 2010-10-07 | 2012-05-09 | 鸿富锦精密工业（深圳）有限公司 | Reset signal discharge circuit |
| CN202978866U (en) * | 2012-11-27 | 2013-06-05 | 福建鑫诺通讯技术有限公司 | A reuse switch circuit for starting a SD card and resetting equipment with the SD card |
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| Publication number | Publication date |
|---|---|
| CN104199752A (en) | 2014-12-10 |
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