CN209448720U - A kind of electric appliance reset circuit and electrical equipment - Google Patents
A kind of electric appliance reset circuit and electrical equipment Download PDFInfo
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- CN209448720U CN209448720U CN201822108408.7U CN201822108408U CN209448720U CN 209448720 U CN209448720 U CN 209448720U CN 201822108408 U CN201822108408 U CN 201822108408U CN 209448720 U CN209448720 U CN 209448720U
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Abstract
The utility model is suitable for electrical equipment field, provide a kind of electric appliance reset circuit and electrical equipment, wherein, electric appliance reset circuit includes key, key reset circuit, watchdog reset circuit, CPU and the DC-DC power source chip being connected respectively with CPU and watchdog reset circuit；Key reset circuit includes power-supply circuit and charge-discharge circuit, power-supply circuit includes the first electronic switch and the second electronic switch being electrically connected respectively with key, first electronic switch and the second electronic switch are electrically connected with charge-discharge circuit simultaneously, charge-discharge circuit is electrically connected by Schmidt trigger with DC-DC power source chip, key is long on time, the first electronic switch and charge-discharge circuit is connected and closes the second electronic switch, triggering CPU power-off；When key unclamps, the second electronic switch and charge-discharge circuit is connected and closes the first electronic switch, triggers CPU electrification reset.By above technical scheme, electric appliance reset circuit is not vulnerable to external environmental interference, good operating stability.
Description
Technical field
The utility model belongs to technical field of electrical equipment more particularly to a kind of electric appliance reset circuit and electrical equipment.
Background technique
Electrical equipment in use, such as longtime running, high temperature, falls, user misoperation, may cause equipment
It crashes.Therefore, electrical equipment can be equipped with power switch mostly to allow the manual restarting equipment of user, or offer to be convenient for the electricity of plug
Source plug facilitates equipment can be with power-off restarting.
It is manually resetted when in the prior art, in order to facilitate electric appliance crash, it usually needs in electric appliance, reset key is set
And corresponding key reset circuit.When electric appliance crashes, user realizes that appliance cut-off is resetted by pressing reset key.Existing
Have in technology, controls the state of a triode by a pull-up resistor and a pull down resistor generally to realize that key resets function
Can, but since the resistance value of pull-up resistor and pull down resistor is larger, the pull-up ability of pull-up resistor and the drop-down energy of pull down resistor
Power is weaker, and the key reset circuit that inventor's discovery is realized through the above way exists during the work time vulnerable to external environment shadow
It rings, the problem of stability difference, the i.e. electric current of very little all may cause triode malfunction.
Utility model content
The utility model provides a kind of electric appliance reset circuit, it is intended to solve the prior art key reset circuit exist vulnerable to
The problem of external environmental interference, key reset circuit poor work stability.
On the one hand, provide a kind of electric appliance reset circuit, including key, key reset circuit, watchdog reset circuit,
CPU and the DC-DC power source chip being connected respectively with the CPU and the watchdog reset circuit；
The key reset circuit includes power-supply circuit and charge-discharge circuit, and the power-supply circuit includes pressing respectively with described
The first electronic switch and the second electronic switch of key electrical connection, first electronic switch and second electronic switch simultaneously with
The charge-discharge circuit electrical connection, the charge-discharge circuit are electrically connected by Schmidt trigger with the DC-DC power source chip；
The key is long on time, and first electronic switch and the charge-discharge circuit is connected and closes second electronics
Switch, the charge-discharge circuit, which charges and triggers the Schmidt trigger, controls the DC-DC power supply chip to the CPU
Power-off；When the key unclamps, second electronic switch and the charge-discharge circuit is connected and closes first electronic cutting
It closes, the charge-discharge circuit, which discharges and triggers the Schmidt trigger control DC-DC power source chip, powers on the CPU
It resets.
Preferably, the power-supply circuit further includes resistance R1 and diode D1；First electronic switch passes through the electricity
Resistance R1 is connected with the anode of the diode D1, the cathode of the diode D1 respectively with second electronic switch and described fill
Discharge circuit is connected.
Preferably, the charge-discharge circuit includes resistance R2 and the one end capacitor C1, the resistance R2 respectively with described two
The cathode of pole pipe D1 is connected, the resistance R2 other end respectively with one end of the capacitor C1 and the Schmidt trigger phase
Even, the other end ground connection of the capacitor C1.
Preferably, first electronic switch is PMOS tube, and second electronic switch is NMOS tube；
The source electrode of the PMOS tube is connected to power end VCC, the first pin of the grid of the PMOS tube and the key
It is connected, and the grid of the PMOS tube is connected by resistance R6 with the power end VCC, the second pin ground connection of the key,
The drain electrode of the PMOS tube is connected by the resistance R1 with the anode of the diode D1；The drain electrode of the NMOS tube with it is described
The cathode of diode D1 is connected, the source electrode ground connection of the NMOS tube, the first pin of the grid of the NMOS tube and the key
It is connected.
Preferably, first electronic switch is PNP pipe, and second electronic switch is NPN pipe, and the power-supply circuit is also
Including resistance R7；
The emitter of the PNP pipe is connected to power end VCC, and the collector of the PNP pipe passes through the resistance R1 and institute
The anode for stating diode D1 is connected, and the base stage of the PNP pipe is connected by the resistance R7 with the first pin of the key, institute
State the second pin ground connection of key；The collector of the NPN pipe is connected with the cathode of the diode D1, the hair of the NPN pipe
The base stage of emitter grounding, the NPN pipe is connected by the resistance R7 with first pin of the key.
Preferably, the watchdog reset circuit includes the WatchDog Timer chip being connected with the CPU；
Whether the WatchDog Timer chip exports feeding-dog signal for CPU described in real-time detection, and the house dog is fixed
When device chip when the feeding-dog signal of CPU output being not detected within a preset time, the WatchDog Timer chip is to institute
CPU is stated to issue reset signal and control the cpu reset.
Preferably, the watchdog reset circuit further include respectively with the CPU and the WatchDog Timer chip phase
Three state buffer chip even.
Preferably, the electric appliance reset circuit further includes the button operation circuit for short-press operation, the button operation
Key described in circuit connection and the CPU.
Preferably, the button operation circuit includes resistance R4, resistance R5, diode D2 and capacitor C2；
The one end the resistance R5 is connected with the CPU, the other end of the resistance R5 sun with the diode D2 respectively
One end of pole, one end of the capacitor C2 and the resistance R4 is connected, and the cathode of the diode D2 connects the of the key
One pin, the second pin ground connection of the key, the other end ground connection of the capacitor C2, the other end of the R4 connect power supply
VDD。
On the other hand, a kind of electrical equipment is provided, including above-mentioned electric appliance reset circuit.
The technical solution of the utility model is with following the utility model has the advantages that electric appliance reset circuit provided by the utility model is logical
The first electronic switch of setting and the second electronic switch are crossed, the first electronic switch and the second electronic switch by key control directly by being connected
Or close, no setting is required between the first electronic switch and the second electronic switch and key pull-up resistor and pull down resistor control the
One electronic switch and the second electronic switch are opened or closed, so that the electric appliance reset circuit is not vulnerable to external environmental interference, work
It is good to make stability, by key pressing and unclamping can make charge-discharge circuit steadily charge or discharge to trigger DC-DC power source chip pair
CPU power-off or electrification reset.Meanwhile by the way that the button operation circuit for short-press operation is arranged, it can be realized and be powered off by key
Reset or other operating functions enrich the use function of key to realize that a key is multi-purpose.
Detailed description of the invention
Fig. 1 is the structural schematic diagram for the electric appliance reset circuit that the utility model embodiment one provides；
Fig. 2 is the partial structure diagram for the electric appliance reset circuit that the utility model embodiment two provides.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.
Electric appliance reset circuit provided by the utility model passes through the first electronic switch of setting and the second electronic switch, the first electricity
Sub switch and the second electronic switch are directly by pressing key control on and off, the first electronic switch and the second electronic switch and key
Between no setting is required pull-up resistor and pull down resistor control being opened or closed for the first electronic switch and the second electronic switch, from
And make the electric appliance reset circuit not vulnerable to external environmental interference, good operating stability.
Embodiment one
Please refer to Fig. 1, the electric appliance reset circuit include key S1, key reset circuit, watchdog reset circuit, CPU with
And the DC-DC power source chip U2 being connected respectively with CPU and watchdog reset circuit.
Key reset circuit includes power-supply circuit 11 and charge-discharge circuit 12, and power-supply circuit 11 includes electric with key S1 respectively
The first electronic switch and the second electronic switch of connection, the first electronic switch and the second electronic switch simultaneously with charge-discharge circuit 12
Electrical connection, charge-discharge circuit 12 are electrically connected by Schmidt trigger U1 with DC-DC power supply chip U2.
Key S1 long on time, is connected the first electronic switch and charge-discharge circuit 12 and closes the second electronic switch, charge and discharge
Circuit 12 charges and triggers Schmidt trigger U1 control DC-DC power source chip and powers off to CPU；When key unclamps, conducting second
Electronic switch and charge-discharge circuit 12 simultaneously close the first electronic switch, and charge-discharge circuit 12 discharges and triggers Schmidt trigger U1
DC-DC power source chip U2 is controlled to CPU electrification reset.
In the utility model embodiment, when key is long on time, the first electronic switch and charge-discharge circuit 12 are connected, the first electricity
Sub switch is closed, and charge-discharge circuit 12 charges at this time, when 12 voltage of charge-discharge circuit is increased to more than Schmidt trigger
After the input high level threshold value of U1, the output of Schmidt trigger U1 will be lower level from high level, Schmidt trigger
U1 is enabled to DC-DC power source chip U2, closes DC-DC power supply chip U2, so that DC-DC power source chip U2 powers off CPU.When
When unclamping key S1, the second electronic switch and charge-discharge circuit 12 are connected, and the first electronic switch is closed, at this time charge-discharge circuit 12
It discharges, after 12 voltage of charge-discharge circuit drops below the input low level threshold value of Schmidt trigger U1, Shi Mi
The output of special trigger U1 will get higher level from low level, and Schmidt trigger U1 is enabled to DC-DC power source chip U2, beat
DC-DC power source chip U2 is opened, so that DC-DC power source chip U2 is to CPU electrification reset.
In the present embodiment, due in electric appliance reset circuit the first electronic switch and the second electronic switch directly with key S1
Connection, the first electronic switch and the second electronic switch directly control on and off, the first electronic switch and second by key S1
No setting is required between electronic switch and key S1 pull-up resistor and pull down resistor control the first electronic switch and the second electronic cutting
What is closed is opened or closed, so that the electric appliance reset circuit is not vulnerable to external environmental interference, good operating stability.Key S1 is pressed i.e.
It can quickly make charge-discharge circuit 12 steadily charge to triggering DC-DC power source chip U2 to power off CPU, key S1 release can be fast
Speed make charge-discharge circuit be steadily discharged to triggering DC-DC power source chip U2 reset, cpu reset reliability are re-powered to CPU
It is good.
In the present embodiment, by setting Schmidt trigger U1 trigger DC-DC power source chip to CPU power off or on reply by cable
Position is acted on using the waveform shaping of Schmidt trigger, prevents external interference, can effectively improve the reliable of the electric appliance reset circuit
Property.Moreover, key is being pressed or unclamped, an electronic switch is had always and is in opening state, thus Schmidt trigger
Input voltage keeps stable state, and then further increases the stability of the electric appliance reset circuit.
In the utility model embodiment, power-supply circuit 11 further includes resistance R1 and diode D1；First electronic switch passes through
Resistance R1 is connected with the anode of diode D1, the cathode of diode D1 respectively with 12 phase of the second electronic switch and charge-discharge circuit
Even.
In the utility model embodiment, charge-discharge circuit includes resistance R2 and capacitor C1, and the one end resistance R2 is respectively with two
The cathode of pole pipe D1 is connected, and the resistance R2 other end is connected with one end of capacitor C1 and Schmidt trigger U1 respectively, capacitor C1's
Other end ground connection.
In the utility model embodiment, key S1 is single-pole double throw key.When key S1 pressing, the first of key S1
Pin 1 and second pin 2 are connected；When unclamping key S1, the first pin 1 and second pin 2 of key S1 is disconnected.
As one embodiment of the utility model, the first electronic switch is PMOS tube Q1, and the second electronic switch is NMOS
Pipe Q2.The source electrode of PMOS tube Q1 is connected to power end VCC, and the grid of PMOS tube Q1 is connected with the first pin 1 of key S1, and
The grid of PMOS tube Q1 is connected by resistance R6 with power end VCC, and the second pin 2 of key S1 is grounded, the drain electrode of PMOS tube Q1
It is connected by resistance R1 with the anode of diode D1；The drain electrode of NMOS tube Q2 is connected with the cathode of diode D1, NMOS pipe Q2
Source electrode ground connection, the grid of NMOS tube Q2 is connected with the first pin 1 of key S1.
In the present embodiment, on time, the first pin 1 and second pin 2 of key S1 is connected key S1 long, at this point, PMOS tube
Q1 conducting, NMOS tube Q2 close, thus constantly to capacitor C1 charge, when capacitor C1 charge to it is defeated more than Schmidt trigger U1
After entering high-level threshold, the output of Schmidt trigger U1 will be lower level from high level, Schmidt trigger U1 to
DC-DC power source chip U2 is enabled, closes DC-DC power source chip U2, so that DC-DC power source chip U2 powers off CPU.Complete power-off
Afterwards, user unclamps key S1, and the first pin 1 and second pin 2 of key S1 disconnects, at this point, PMOS pipe Q1 is closed, NMOS tube
Q2 conducting, capacitor C1 constantly discharge over the ground, after being discharged to the input low level threshold value lower than Schmidt trigger U1, Shi Mi
The output of special trigger U1 will get higher level from low level, and Schmidt trigger U1 is enabled to DC-DC power source chip U2, close
DC-DC power source chip U2, so that DC-DC power source chip U2 is to CPU electrification reset.
In the utility model embodiment, watchdog reset circuit includes the WatchDog Timer chip U3 being connected with CPU.It sees
Whether door dog timer chip U3 exports feeding-dog signal for real-time detection CPU, and WatchDog Timer chip U3 is in preset time
When the feeding-dog signal of CPU output is inside not detected, WatchDog Timer chip U3 issues reset signal to CPU and controls CPU and answers
Position.
WatchDog Timer chip U3 receives feeding-dog signal from CPU, and can control the hardware reset foot of CPU.Electric appliance
When equipment works normally, WatchDog Timer chip U3 is constantly in the state whether detection CPU exports feeding-dog signal, default
Feeding-dog signal is not detected in time, that is, thinks that CPU crashes, cpu reset is immediately controlled at this time.
In the utility model embodiment, WatchDog Timer chip U3 model SGM706, preset time is 1.6 seconds.That is:
WatchDog Timer chip U3 does not detect the feeding-dog signal of CPU in 1.6 seconds, that is, thinks that CPU crashes, be immediately controlled at this time
Cpu reset.WatchDog Timer chip U3 can also use other models, and the preset time is by WatchDog Timer chip U3's
Depending on model.
Detect whether CPU in electrical equipment occurs extremely automatically by the WatchDog Timer chip U3 of watchdog reset circuit
Machine, and the CPU that electrical equipment can be controlled when electrical equipment crashes automatically resets；Even if WatchDog Timer chip U3 loses
Effect, the manual long-pressing key S1 of user, which can be realized, carries out power-off restoration to the CPU of electrical equipment, watchdog reset circuit and presses
Key reset circuit can be achieved cpu reset and facilitate user couple to reset good reliability, and power-down reset operation is simple and convenient
The power-off restoration of electrical equipment.
As one embodiment of the utility model, watchdog reset circuit further include respectively with CPU and house dog timing
Device chip U3 connected three state buffer chip U4.Wherein, three state buffer chip U4 is connected with the port GPIO1 of CPU.
Three state buffer chip U4 is controlled whether to open by CPU.Since CPU electrifying startup needs the regular hour, in CPU
Three state buffer chip U4 is first closed in start-up course, so that the feeding-dog signal of WatchDog Timer chip U3 be made to input in height
Resistance state, WatchDog Timer chip U3 keep silent status, open three state buffer chip U4 again after CPU start completion,
CPU just constantly exports feeding-dog signal to WatchDog Timer chip U3, and false triggering house dog is fixed when can prevent CPU from powering in this way
When device chip U3 and to CPU send reset signal, thus prevent CPU accidentally reset, improve electric appliance reset circuit reliable operation
Property.
As one embodiment of the utility model, electric appliance reset circuit further includes the button operation electricity for short-press operation
Road 4, button operation circuit 4 connect key S1 and CPU.It, can be by pressing by the way that the button operation circuit for short-press operation is arranged
Key S1 realizes power-off restoration or other operating functions, to realize that a key is multi-purpose, enriches the use function of key.
As one embodiment of the utility model, button operation circuit includes resistance R4, resistance R5, diode D2 and electricity
Hold C2；The one end resistance R5 is connected with CPU, the other end of resistance R5 respectively with the anode of diode D2, one end of capacitor C2 and electricity
The one end for hindering R4 is connected, the first pin of the cathode connection key S1 of diode D2, the second pin ground connection of key S1, capacitor C2
Other end ground connection, the other end of R4 connects power vd D.
Wherein, the one end resistance R5 is connected with the port GPIO2 of CPU.When key S1 short-press, the first pin 1 of key S1
It is connected with second pin 2, the port GPIO2 of CPU becomes high level from low level, and CPU, which acquires the signal, can be realized electric appliance
Corresponding actions.The voltage that key S1 short-press is not enough to capacitor C1 is increased to the input high level threshold value of Schmidt trigger U1, because
This not will lead to DC-DC power source chip U2 to CPU power-off restoration.In practical applications, the capacitance and electricity of setting C1 can be passed through
The resistance value of R2 is hindered, is made with to realize key S1 long on time to DC-DC power source chip U2 to CPU power-off restoration, when short-press key S1
Realize other function.Such as: realizing to DC-DC power source chip U2 to CPU power-off restoration, short-press key S1 within long-pressing key S1 ten seconds
Other function is realized at three seconds.
The course of work of the electric appliance reset circuit of the utility model is as follows: after the completion of CPU is powered on, CPU controls Three-State
Device chip U4 open and to WatchDog Timer chip U3 export feeding-dog signal, WatchDog Timer chip U3 in 1.6 seconds not
When detecting feeding-dog signal, WatchDog Timer chip U3 is to CPU output reset signal, cpu reset；If CPU does not reset, user
Manual long-pressing key S1, key reset circuit is to DC-DC power source chip U2 input low level signal, to control DC-DC power source
The output of chip U2 non-transformer, so that CPU unclamps key S1 after CPU power-off to power-off, CPU re-powers reset.
The utility model also provides a kind of electrical equipment, including above-mentioned electric appliance reset circuit.Electrical equipment passes through setting
Above-mentioned electric appliance reset circuit, electrical equipment reset good reliability when crashing, and facilitate user multiple to the power-off of electrical equipment
Position.
Electric appliance reset circuit provided by the utility model passes through the first electronic switch of setting and the second electronic switch, the first electricity
Sub switch and the second electronic switch are directly by pressing key control on and off, the first electronic switch and the second electronic switch and key
Between no setting is required pull-up resistor and pull down resistor control being opened or closed for the first electronic switch and the second electronic switch, from
And the electric appliance reset circuit is vulnerable to external environmental interference, good operating stability, by key pressing and unclamps and can make charge-discharge circuit
Steadily charge or discharge are to trigger DC-DC power source chip to CPU power-off or electrification reset.Meanwhile short-press is used for by setting
The button operation circuit of operation can realize power-off restoration or other operating functions by key, to realize that a key is multi-purpose, enrich
The use function of key.
Embodiment two
Incorporated by reference to referring to Figures 1 and 2, which includes key S1, key reset circuit, watchdog reset electricity
Road, CPU and the DC-DC power source chip U2 being connected respectively with CPU and watchdog reset circuit.
Key reset circuit includes power-supply circuit 11 and charge-discharge circuit 12, and power-supply circuit 11 includes electric with key S1 respectively
The first electronic switch and the second electronic switch of connection, the first electronic switch and the second electronic switch simultaneously with charge-discharge circuit 12
Electrical connection, charge-discharge circuit 12 are electrically connected by Schmidt trigger U1 with DC-DC power supply chip U2.
Key S1 long on time, is connected the first electronic switch and charge-discharge circuit 12 and closes the second electronic switch, charge and discharge
Circuit 12 charges and triggers Schmidt trigger U1 control DC-DC power source chip and powers off to CPU；When key unclamps, conducting second
Electronic switch and charge-discharge circuit 12 simultaneously close the first electronic switch, and charge-discharge circuit 12 discharges and triggers Schmidt trigger U1
DC-DC power source chip U2 is controlled to CPU electrification reset.
In the utility model embodiment, power-supply circuit 11 includes resistance R1 and diode D1；First electronic switch passes through electricity
Resistance R1 is connected with the anode of diode D1, and the cathode of diode D1 is connected with the second electronic switch and charge-discharge circuit 12 respectively.
In the utility model embodiment, charge-discharge circuit 12 include resistance R2 and capacitor C1, the one end resistance R2 respectively with
The cathode of diode D1 is connected, and the resistance R2 other end is connected with one end of capacitor C1 and Schmidt trigger respectively, capacitor C1's
Other end ground connection.
The difference between this embodiment and the first embodiment lies in key reset circuit.In the present embodiment, the first electronic switch is PNP
Pipe Q3, the second electronic switch are NPN pipe Q4, and power-supply circuit 11 further includes resistance R7；The emitter of PNP pipe Q3 is connected to power supply
Hold VCC, the collector of PNP pipe Q3 is connected by resistance R1 with the anode of diode D1, the base stage of PNP pipe Q3 pass through resistance R7 and
The first pin of key S1 is connected, and the second pin 2 of key S1 is grounded；The cathode phase of the collector of NPN pipe Q4 and diode D1
Even, the emitter ground connection of NPN pipe Q4, the base stage of NPN pipe Q4 are connected by resistance R7 with the first pin 1 of key S1.This implementation
Other circuit structures of example are the same as example 1.
The key reset circuit of the present embodiment is similar with the key reset circuit working principle of embodiment one.Key S1 long-pressing
When, the first pin 1 and second pin 2 conducting of key S1, PNP pipe Q3 conducting, NPN pipe Q4 is closed, thus constantly to capacitor C1
Charging, when charge to be more than the input high level threshold value of Schmidt trigger U1 after, the output of Schmidt trigger U1 will
It being lower level from high level, Schmidt trigger U1 is enabled to DC-DC power source chip U2, DC-DC power source chip U2 is closed, thus
DC-DC power supply chip U2 powers off CPU；After completing power-off, user unclamps key S1, and the first pin 1 of key S1 and second draws
Foot 2 disconnects, and PNP pipe Q3 is closed, and NPN pipe Q4 conducting, capacitor C1 constantly discharges over the ground, to lower than Schmidt trigger after electric discharge
After the input low level threshold value of U1, the output of Schmidt trigger U1 will get higher level, Schmidt trigger from low level
U1 is enabled to DC-DC power source chip U2, closes DC-DC power source chip U2, so that DC-DC power source chip U2 on CPU to replying by cable
Position.
In the utility model embodiment, by the way that the first electronic switch and the second electronic switch are used PNP pipe Q3 and NPN
Pipe Q4 replaces the PMOS tube Q1 and NMOS tube Q2 in embodiment one, since PNP pipe and NPN manage opposite PMOS tube and NMOS tube valence
Lattice are relatively inexpensive, to can effectively reduce production cost.
The utility model also provides a kind of electrical equipment, including above-mentioned electric appliance reset circuit.Electrical equipment passes through setting
Above-mentioned electric appliance reset circuit, electrical equipment resets good reliability when crashing and stability is good, while facilitating user to electric appliance
The power-off restoration of equipment, and the production cost of electrical equipment can be reduced.
Electric appliance reset circuit provided by the utility model passes through the first electronic switch of setting and the second electronic switch, the first electricity
Sub switch and the second electronic switch are directly by pressing key control on and off, the first electronic switch and the second electronic switch and key
Between no setting is required pull-up resistor and pull down resistor control being opened or closed for the first electronic switch and the second electronic switch, from
And the electric appliance reset circuit is by external environmental interference, good operating stability, by key pressing and unclamping can make charge-discharge circuit steady
Surely charge or discharge are to trigger DC-DC power source chip to CPU power-off or electrification reset.By by the first electronic switch and second
Electronic switch can effectively reduce production cost using PNP pipe and NPN pipe.
Upper is only the preferred embodiment of the utility model, is not intended to limit the utility model, all practical new at this
Made any modifications, equivalent replacements, and improvements etc., should be included in the protection of the utility model within the spirit and principle of type
Within the scope of.
Claims (10)
1. a kind of electric appliance reset circuit, which is characterized in that including key, key reset circuit, watchdog reset circuit, CPU with
And the DC-DC power source chip being connected respectively with the CPU and the watchdog reset circuit；
The key reset circuit includes power-supply circuit and charge-discharge circuit, and the power-supply circuit includes electric with the key respectively
The first electronic switch and the second electronic switch of connection, first electronic switch and second electronic switch simultaneously with it is described
Charge-discharge circuit electrical connection, the charge-discharge circuit are electrically connected by Schmidt trigger with the DC-DC power source chip；
The key is long on time, and first electronic switch and the charge-discharge circuit is connected and closes second electronic cutting
It closes, the charge-discharge circuit, which charges and triggers the Schmidt trigger control DC-DC power source chip, breaks to the CPU
Electricity；When the key unclamps, second electronic switch and the charge-discharge circuit is connected and closes first electronic switch,
The charge-discharge circuit, which discharges and triggers the Schmidt trigger, controls the DC-DC power source chip to replying by cable on the CPU
Position.
2. electric appliance reset circuit according to claim 1, which is characterized in that the power-supply circuit further includes resistance R1 and two
Pole pipe D1；First electronic switch is connected by the resistance R1 with the anode of the diode D1, the diode D1's
Cathode is connected with second electronic switch and the charge-discharge circuit respectively.
3. electric appliance reset circuit according to claim 2, which is characterized in that the charge-discharge circuit include resistance R2 and
The one end capacitor C1, the resistance R2 is connected with the cathode of the diode D1 respectively, the resistance R2 other end respectively with it is described
One end of capacitor C1 and the Schmidt trigger are connected, the other end ground connection of the capacitor C1.
4. electric appliance reset circuit according to claim 3, which is characterized in that first electronic switch is PMOS tube, institute
Stating the second electronic switch is NMOS tube；
The source electrode of the PMOS tube is connected to power end VCC, and the grid of the PMOS tube is connected with the first pin of the key,
And the grid of the PMOS tube is connected by resistance R6 with the power end VCC, the second pin ground connection of the key, it is described
The drain electrode of PMOS tube is connected by the resistance R1 with the anode of the diode D1；The drain electrode of the NMOS tube and two pole
The cathode of pipe D1 is connected, and the source electrode ground connection of the NMOS tube, the grid of the NMOS tube is connected with the first pin of the key.
5. electric appliance reset circuit according to claim 3, which is characterized in that first electronic switch is PNP pipe, described
Second electronic switch is NPN pipe, and the power-supply circuit further includes resistance R7；
The emitter of the PNP pipe is connected to power end VCC, and the collector of the PNP pipe passes through the resistance R1 and described two
The anode of pole pipe D1 is connected, and the base stage of the PNP pipe is connected by the resistance R7 with the first pin of the key, described to press
The second pin of key is grounded；The collector of the NPN pipe is connected with the cathode of the diode D1, the emitter of the NPN pipe
The base stage of ground connection, the NPN pipe is connected by the resistance R7 with first pin of the key.
6. electric appliance reset circuit according to claim 1, which is characterized in that the watchdog reset circuit include with it is described
CPU connected WatchDog Timer chip；
Whether the WatchDog Timer chip exports feeding-dog signal, the WatchDog Timer for CPU described in real-time detection
When the feeding-dog signal of CPU output is not detected in chip within a preset time, the WatchDog Timer chip is to the CPU
It issues reset signal and controls the cpu reset.
7. electric appliance reset circuit according to claim 6, which is characterized in that the watchdog reset circuit further includes difference
The three state buffer chip being connected with the CPU and the WatchDog Timer chip.
8. electric appliance reset circuit according to claim 1, which is characterized in that the electric appliance reset circuit further includes for short
By the button operation circuit of operation, key described in the button operation circuit connection and the CPU.
9. electric appliance reset circuit according to claim 8, which is characterized in that the button operation circuit include resistance R4,
Resistance R5, diode D2 and capacitor C2；
The one end the resistance R5 is connected with the CPU, the other end of the resistance R5 respectively with the anode of the diode D2, institute
One end of one end and the resistance R4 for stating capacitor C2 is connected, and what the cathode of the diode D2 connected the key first draws
Foot, the second pin ground connection of the key, the other end ground connection of the capacitor C2, the other end of the R4 connect power vd D.
10. a kind of electrical equipment, which is characterized in that including electric appliance reset circuit as described in any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822108408.7U CN209448720U (en) | 2018-12-14 | 2018-12-14 | A kind of electric appliance reset circuit and electrical equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822108408.7U CN209448720U (en) | 2018-12-14 | 2018-12-14 | A kind of electric appliance reset circuit and electrical equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209448720U true CN209448720U (en) | 2019-09-27 |
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| CN201822108408.7U Active CN209448720U (en) | 2018-12-14 | 2018-12-14 | A kind of electric appliance reset circuit and electrical equipment |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111142446A (en) * | 2020-01-07 | 2020-05-12 | 珠海格力电器股份有限公司 | Control panel of electric appliance and electric appliance |
| CN112084054A (en) * | 2020-08-17 | 2020-12-15 | 浪潮思科网络科技有限公司 | Watchdog circuit, and dog feeding method and device |
| CN114003117A (en) * | 2021-12-01 | 2022-02-01 | 深圳市创视微智能技术有限公司 | Terminal device powered by built-in battery and reset control method |
-
2018
- 2018-12-14 CN CN201822108408.7U patent/CN209448720U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111142446A (en) * | 2020-01-07 | 2020-05-12 | 珠海格力电器股份有限公司 | Control panel of electric appliance and electric appliance |
| CN112084054A (en) * | 2020-08-17 | 2020-12-15 | 浪潮思科网络科技有限公司 | Watchdog circuit, and dog feeding method and device |
| CN114003117A (en) * | 2021-12-01 | 2022-02-01 | 深圳市创视微智能技术有限公司 | Terminal device powered by built-in battery and reset control method |
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