CN207782762U - A kind of automatic reset circuit and electronic product - Google Patents
A kind of automatic reset circuit and electronic product Download PDFInfo
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- CN207782762U CN207782762U CN201820077904.8U CN201820077904U CN207782762U CN 207782762 U CN207782762 U CN 207782762U CN 201820077904 U CN201820077904 U CN 201820077904U CN 207782762 U CN207782762 U CN 207782762U
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Abstract
The utility model discloses a kind of automatic reset circuit and electronic products, include the master chip of RC charging circuits, reset switch pipe, shunt circuit and operating system program；The RC charging circuits connect DC power supply, are the capacitor charging in RC charging circuits using DC power supply；The reset switch pipe switches its on off operating mode when the voltage on the capacitance is more than given threshold, generates reset signal；The shunt circuit shunts the charging current for flowing to the capacitance when receiving the shunt control signal of master chip output, and the voltage on capacitance is made to be less than given threshold；The master chip exports the shunt control signal during system program normal operation, stops exporting the shunt control signal when system program crashes, and controls system program reset when receiving the reset signal and restart.The utility model control system program can automatically reset and restart after system in case of system halt, reduce the probability for crashing and being damaged to system data and peripheral equipment.
Description
Technical field
The utility model belongs to electronic circuit technology field, is related to a kind of reset circuit, specifically, be related to one kind can
To realize the circuit design to automatically reset.
Background technology
Reset circuit is that one kind is widely used in electronic product, is specially set to improve electronic product reliability of operation
The tandem circuit of meter.It is dead that many electronic products will appear Cartridge once in a while in the process of running（It crashes）The case where, it encounters this
When situation, if without manipulable hardware reset button or other resetting apparatuses, it can only take and directly power off or tear open machine
The mode reprocessed resets system software, makes system roll-back, not only troublesome in poeration, but also can cause the time
On unnecessary waste.Therefore, reset circuit is designed on electronic product is very important.
The USB that PC or charger are inserted into while existing reset circuit mainly has long-press button reset, press ＆ hold is multiple
Several forms such as position, the USB device reset that PC is inserted into after crashing.These existing reset modes are required to manual operation could be complete
At, and can not possibly be immediately performed in the first time of system in case of system halt, therefore there are problems that resetting and delay.Since electronic product exists
Under crash state, dysfunction tanglewracks to the operation of system peripheral, therefore, easily to system data and
Peripheral equipment damages.For example, may delete the confused operation of FLASH useful historical data, the operation of mistake can
Overcurrent can be caused the potential dangers such as to burn to peripheral equipments such as LED light.
Therefore, how to automatically reset in the first time control system program of system in case of system halt, to avoid above-mentioned danger occurs,
It is an important topic of current Electronic products manufacturing field face.
Invention content
The purpose of this utility model is to provide a kind of automatic reset circuit, can after system in case of system halt control system program
It automatically resets and restarts, system data and peripheral equipment are damaged with to solve uncertain software operation after system in case of system halt
Problem.
In order to solve the above technical problems, the utility model is achieved using following technical scheme：
The utility model is in one aspect, it is proposed that a kind of automatic reset circuit, including RC charging circuits, reset switch
Pipe, shunt circuit and master chip；The RC charging circuits connect DC power supply, are in RC charging circuits using the DC power supply
Capacitor charging；The reset switch pipe connects the RC charging circuits, the voltage on capacitance in the RC charging circuits
When more than given threshold, the reset switch pipe switches its on off operating mode, generates reset signal；Described in the shunt circuit connection
RC charging circuits, and only when receiving shunt control signal, the charging current to flowing to the capacitance shunts, and makes described
Voltage on capacitance is less than the given threshold；The system of electronic product where the master chip runs the automatic reset circuit
Program, and the shunt control signal is exported during system program normal operation, stop output institute when system program crashes
Shunt control signal is stated, and when receiving the reset signal, control system Program reset is restarted.
Preferably, the switch ways of the reset switch pipe be connected to the DC power supply and master chip reset pin it
Between, the control terminal of the reset switch pipe connects the anode of the capacitance in the RC charging circuits.
Preferably, the reset switch pipe preferably uses a N-channel MOS pipe, the drain electrode of the N-channel MOS pipe to connect
The DC power supply, source electrode are connected to the reset pin of the master chip, and grid is connecting the capacitance in the RC charging circuits just
Pole；The given threshold is preferably set to the conducting voltage of the N-channel MOS pipe.
Further, it is additionally provided with bleeder circuit in the automatic reset circuit, is connected to the N-channel MOS pipe
Between source electrode and ground, the divider node of the bleeder circuit connects the reset pin of the master chip, using bleeder circuit to institute
It states DC power supply to be divided, to generate the high level reset signal for the interface voltage requirement that disclosure satisfy that master chip.
A kind of preferred circuit as the shunt circuit designs, and a switching tube is provided in the shunt circuit, will
The switch ways of the switching tube are connected between the anode and ground of the capacitance in the RC charging circuits, by the switch
The control terminal of pipe is connected to the master chip, and when receiving the shunt control signal of master chip output, it is logical to control its switch
Road is connected to, and is diverted to ground by the part charging circuit for flowing to the capacitance.
Preferably, the switching tube preferably use a N-channel MOS pipe, the N-channel MOS pipe drain electrode connection described in
The anode of the capacitance in RC charging circuits, source electrode ground connection, grid are connected to the pwm signal output end of the master chip, receive
The shunt control signal of the PWM forms of master chip output.When can control the N-channel MOS Guan Shitong using the pwm signal
It is disconnected, and then the most of charging current for flowing to the capacitance is branched to ground.
A kind of preferred circuit as the RC circuits designs, and can the resistance in the RC charging circuits be connected to institute
It states between DC power supply and the anode of the capacitance, the cathode of the capacitance is grounded.
In order to make the automatic reset circuit of the utility model crash in two kinds of electronic product charging and normal use
Shi Douneng resets in time, the outside that the utility model is accessed in electronic product charging process by the charging interface of electronic product
Charge power supply is as the transmitting DC to the RC charging circuits；Battery in electronic product is passed through into a switch element
The RC charging circuits are connected, the switch element is only connected to the battery when being accessed without charge power supply on the charging interface
With RC charging circuits, the transmitting DC that battery is exported to the RC charging circuits.It is possible thereby to realize in electronic product
The DC power supply is provided by charge power supply during charging, is carried by the internal battery of electronic product in electronic product uncharged period
For the DC power supply, the generation for realizing the DC power supply is automatically switched between charge power supply and battery supply.
Preferably, the switch element preferably uses a P-channel metal-oxide-semiconductor, the grid of the P-channel metal-oxide-semiconductor to connect institute
Charging interface is stated, source electrode connects the battery, and drain electrode connects the RC charging circuits.
The utility model is on the other hand, it is also proposed that a kind of electronic product, including RC charging circuits, reset switch pipe,
Shunt circuit and master chip；The RC charging circuits connect DC power supply, are in RC charging circuits using the DC power supply
Capacitor charging；The reset switch pipe connects the RC charging circuits, and the voltage on capacitance in the RC charging circuits is super
When crossing given threshold, the reset switch pipe switches its on off operating mode, generates reset signal；The shunt circuit connects the RC
Charging circuit, and only when receiving shunt control signal, the charging current to flowing to the capacitance shunts, and makes the electricity
Voltage in appearance is less than the given threshold；The system program of the master chip operation electronic product, and run in system program
The shunt control signal is exported during normal, stops exporting the shunt control signal when system program crashes, and connecing
When receiving the reset signal, control system Program reset is restarted.
Compared with prior art, the advantages of the utility model and good effect is：The utility model is being using master chip
The control signal that system program generates during normal operation controls reset circuit, and reset circuit is made to receive control letter
Number when do not generate reset signal, and when system program leads to not generate the control signal because of crash, automatically generate reset letter
Number control master chip reset is restarted, it is thus achieved that system program automatically resets, compares traditional manual reset circuit, can be with
It is resetted at once in the first time control system of system in case of system halt, then reduces software behaviour chaotic during system program crashes
Make the probability damaged to system data and peripheral equipment, improve the performance of electronic product, improve user uses body
It tests.
After the detailed description of the utility model embodiment is read in conjunction with the figure, other features and advantages of the utility model
It will become clearer.
Description of the drawings
Fig. 1 is a kind of schematic block circuit diagram of the embodiment for the automatic reset circuit that the utility model is proposed；
Fig. 2 is a kind of physical circuit schematic diagram of embodiment of automatic reset circuit shown in FIG. 1；
Fig. 3 is the physical circuit schematic diagram of another embodiment of automatic reset circuit shown in FIG. 1.
Specific implementation mode
Specific embodiment of the present utility model is described in more detail below in conjunction with the accompanying drawings.
The reset circuit of the present embodiment is to realize auto-reset function, needs the operating status to system program（It is normal or
It crashes）Realize automatic identification, so as to system program during normal operation, will not cause because mistakenly generating reset signal be
System program is surprisingly restarted；And when system program crashes, and reset signal can be automatically generated, control system program is crashing
After can rapidly automatically reset and restart, to shorten the duration of system in case of system halt as much as possible, and then reduce because of system in case of system halt
The probability that Shi Chengxu confusions damage system data, peripheral components improves the reliability of electronic product work.
To realize the automatic identification of system program operating status, the present embodiment, which utilizes, is used for operating system journey in electronic product
The global design of reset circuit is completed in the master chip cooperation of sequence, can be provided during normal operation in system program using master chip
The characteristic of stable control signal and control signal needed for can not being exported when system program crashes, identifying system program are current
Operating status, and using master chip output the control signal control reset circuit receiving it is described control signal phase
Between do not generate reset signal, and after the control blackout, automatically generate reset signal, and be sent to the master chip,
Restarted with controlling the reset of the system program in master chip, realizes auto-reset function.
Based on above-mentioned mentality of designing, the present embodiment is provided with RC charging circuits, reset switch pipe, shunting in reset circuit
The chief components such as circuit, as shown in Figure 1.Wherein, RC charging circuits are connected to DC power supply VCC, utilize DC power supply
The charging current of VCC outputs is the capacitance C chargings in RC charging circuits, to promote the voltage on capacitance C anodes.The direct current
Even if source VCC should select in electronic product when system program crashes also retainable DC power supply, such as cell voltage etc., with
Ensure that the reset circuit of the present embodiment remains to normal operation in system in case of system halt.The shunt circuit is used for in RC charging circuits
Charging current shunted, to control the voltage on capacitance C anodes.Specifically, shunt circuit can be connected to described
RC charging circuits, and utilize the control signal of master chip output（Hereinafter referred to as shunt control signal）Control the work of shunt circuit
State.That is, when the shunt control signal of master chip output is effective, control shunt circuit connects diverter branch, by DC power supply
The part that VCC should be delivered to the charging current of capacitance C is shunted via the diverter branch, to reduce on capacitance C anodes
Voltage, make it below given threshold.And when master chip can not provide effective shunt control signal because system program crashes
When, shunt circuit disconnects its diverter branch, makes all to flow to RC charging electricity by the charging current that DC power supply VCC is exported
The capacitance C in road is more than the given threshold to make the voltage on capacitance C anodes quickly increase.By reset switch pipe
The RC charging circuits are connected to, break-make control are carried out to the reset switch pipe using the voltage on capacitance C anodes, to generate
Required reset signal.Specifically, when the voltage on capacitance C anodes is less than the given threshold, reset switch pipe is kept
The on off operating mode of acquiescence；When the voltage on capacitance C anodes rises and is more than the given threshold, reset switch pipe is from acquiescence
On off operating mode switches to opposite on off operating mode, and then generates high level or the effective reset signal of low level, is sent to master
Chip, to control the reset of the system program in master chip, restarting operation makes system be automatically restored to normally from crash state
Operating status realizes the auto-reset function after electronic product crashes.
It is multiple for requiring high level in view of different master chips has different requirements to the level state of reset signal
For the master chip of position signal, control terminal voltage can be selected for the switch element that is connected when high level（Such as three pole of NPN type
Pipe, N-channel MOS pipe etc.）It is connected to the direct current as the reset switch pipe, and by the switch ways of reset switch pipe
Between source VCC and master chip, to which the voltage on the capacitance C anodes rises and is more than given threshold（The given threshold
It can be set as the conducting voltage of the switch element）When, control reset switch pipe from the switching-on state of off state, with
The effective reset signal of high level is provided to master chip.It, can be with for the master chip for requiring low level reset signal
Select control terminal voltage for the switch element that is connected when low level（Such as PNP type triode, P-channel metal-oxide-semiconductor etc.）As described
Reset switch pipe, and the switch ways of reset switch pipe are connected between the DC power supply VCC and master chip, to
When voltage on the capacitance C anodes rises and is more than given threshold, control reset switch pipe switches to shutdown from conducting state
State, the reset pin to set master chip is low level, controls the reset of the system program in master chip and restarts.
Below by two specific embodiments, the physical circuit design of the automatic reset circuit is explained in detail
It states.
Embodiment one, as described in Figure 2, the present embodiment using N-channel MOS pipe Q2 as the reset switch pipe for said
It is bright.The drain electrode of N-channel MOS pipe Q2 is connected to the DC power supply VCC, source electrode is connected to master chip, and the reset to master chip is drawn
Foot exports the effective reset signal RESET of high level.In view of the interface level of some master chips requires that direct current may be less than
The voltage magnitude of power supply VCC, therefore, to protect the reset pin of master chip to be damaged from overvoltage, the present embodiment can be in the N
The source electrode of channel MOS tube Q2 further connects bleeder circuit, such as the source electrode of N-channel MOS pipe Q2 is passed through divider resistance R4, R5
Ground connection, when N-channel MOS pipe Q2 is connected, divides DC power supply VCC using divider resistance R4, R5, can be expired with generating
The high level reset signal RESET that the interface level of sufficient master chip requires, and via filter capacitor C5 filtering after, be transmitted to main core
The reset pin of piece controls master chip parking position accuracy.The reset pin of master chip is grounded by filter capacitor C5, utilizes filtering
Capacitance C5 is malfunctioned caused by can reducing reset signal RESET shakes, improves the accuracy for resetting control.
The grid of the N-channel MOS pipe Q2 is connected to RC charging circuits, resistance R2 may be used in the RC charging circuits
It connects to be formed with capacitance C4, one end of resistance R2 is connected to DC power supply VCC, the other end is connected to the anode of capacitance C4, electricity
Hold the cathode ground connection of C4.The grid of the N-channel MOS pipe Q2 can be connected to the anode of capacitance C4, by changing capacitance C4 just
Voltage on extremely controls N-channel MOS pipe Q2 break-makes.
In order to realize that control, anode of the present embodiment in capacitance C4 connect shunt circuit to the voltage on capacitance C4 anodes,
The charging current that capacitance C4 is flowed to by control, to achieve the purpose that adjust capacitance C4 voltages.One kind as the present embodiment is excellent
It selects circuit design, the present embodiment to be provided with a switching tube Q3 in the shunt circuit, the switch ways of switching tube Q3 is connected
Between the anode and ground of capacitance C4, control terminal receives the shunt control signal of master chip output.When system program normal operation,
When the normal output steering of master chip controls signal, be connected using shunt control signal control switching tube Q3, to flowing to capacitance
The charging current of C4 is shunted, and so that a part of charging current is flowed to ground via the switch ways of switching tube Q3, to limit electricity
The voltage held on C4 anodes rises, and the voltage on capacitance C4 anodes is made to be consistently less than given threshold, and given threshold here can be with
It is defined as the conducting voltage of N-channel MOS pipe Q2, to keep the off state of N-channel MOS pipe Q2.At this point, reset signal
RESET is low level invalid state, and master chip will not reset, and keeps normal operating condition.
The switching tube Q3 can select a variety of switch elements such as triode, metal-oxide-semiconductor, silicon-controlled, and the present embodiment is with N-channel
It is illustrated for metal-oxide-semiconductor.The drain electrode of N-channel MOS pipe Q3 is connected to the anode of capacitance C4, source electrode ground connection, grid is connected to
Master chip receives the shunt control signal of master chip output.As a kind of preferred design of the present embodiment, preferably by N ditches
The grid of road metal-oxide-semiconductor Q3 is connected to the pwm signal output end of master chip, receives the pwm signal of master chip output, is believed using PWM
Number be used as shunt control signal, control N-channel MOS pipe Q3 switch-on and -off, by DC power supply VCC to capacitance C4 major part charge
Current distributing is unable to reach N-channel MOS pipe by reducing the charging current of capacitance C4 to ground to control the voltage on capacitance C4
The conducting voltage of Q2 enables N-channel MOS pipe Q2 to be held off during the normal output pwm signal of master chip, sets reset
Signal RESET is invalid state, and master chip does not enter reset state.
When system program crashes, master chip can not output pwm signal.At this point, the Q3 cut-offs of N-channel MOS pipe, pass through direct current
The charging current of power supply VCC outputs all flows to capacitance C4, and the voltage on capacitance C4 is made quickly to increase, and is just more than N-channel quickly
The conducting voltage of metal-oxide-semiconductor Q2, and then N-channel MOS pipe Q2 saturation conductions are controlled, DC power supply VCC is via divider resistance R4, R5 points
After pressure, the effective reset signal RESET of high level is generated, is sent to the reset pin of master chip, control master chip reset is restarted,
Realize the function of automatically reseting after system in case of system halt.
In the present embodiment, the DC power supply VCC can be provided during electronic product charges by charge power supply VBUS,
And can be provided by the battery in electronic product during electronic product is without external charge power supply, it can ensure direct current in this way
Source VCC no matter system program during normal operation or crash state, can exist always, then ensure the present embodiment from
Dynamic reset circuit can normal operation, first time after system in case of system halt generates effective reset signal RESET, control system
Rapid reset.
Automatically switch to be realized between charge power supply VBUS and battery supply VBAT, the present embodiment is by RC charging circuits
It is connected to the charging interface of electronic product, and the battery in electronic product is connected to by a switch element Q1.Utilize charging
The charge power supply VBUS accessed in mouthful carries out break-make control to the switch element Q1, and then has charge power supply on charging interface
When VBUS is accessed, the connecting path of battery and RC charging circuits is cut off by control switch element Q1, and uses charge power supply
VBUS charges for RC charging circuits.Conversely, when being accessed without charge power supply VBUS on charging interface, pass through control switch element Q1
The connecting path for connecting battery and RC charging circuits charges thereby using battery supply VBAT for RC charging circuits.
A kind of preferred circuit as the present embodiment designs, and the present embodiment is using P-channel metal-oxide-semiconductor as the switch element
Q1 is connected between battery and RC charging circuits.Specifically, the source electrode of P-channel metal-oxide-semiconductor Q1 can be connected to battery, leaked
Pole connects RC charging circuits, and the specific resistance R2 connected in RC charging circuits charges to capacitance C4 by resistance R2.By P-channel
The grid of metal-oxide-semiconductor Q1 is connected to charging interface, and is grounded by pull down resistor R1.
When being accessed without external charging power supply VBUS on the charging interface of electronic product, the grid voltage of P-channel metal-oxide-semiconductor Q1
Pull down to ground by resistance R1.At this point, P-channel metal-oxide-semiconductor Q1 due to its source grid voltage higher than its conduction voltage drop and enter saturation
Conducting state, and then battery is connected to RC charging circuits, it is charged for RC charging circuits using battery supply VBAT.
In order to avoid the electric current exported by battery is transmitted to the charging interface of electronic product, the present embodiment is preferably described
Anti- back biased diode D1 is connected on charging interface, is with ensure that charging current can only be introduced into electronic product by charging interface
System circuit, without reversely flowing to charging interface.
When there is external charging power supply VBUS accesses on the charging interface of electronic product, the grid voltage of P-channel metal-oxide-semiconductor Q1
Equal to the voltage of charge power supply VBUS, since the voltage of charge power supply VBUS is more than the voltage VBAT, P-channel MOS of battery
Pipe Q1 is transferred to cut-off state, and then cuts off the access between battery and RC charging circuits, switches to charge power supply VBUS and is filled for RC
Circuit charges.
No matter crash problem occurs in the charge state for system program as a result, or issues life and death machine in no charged state
The automatic reset circuit of problem, the present embodiment can quickly generate the effective reset signal of high level after generation of crashing
RESET, control system automatically reset.
Certainly, the switch element Q1 can also use the switch element of the other forms such as triode, silicon-controlled, this implementation
Example is not limited in the above citing.
The effective reset signal of high level can be generated using automatic reset circuit shown in embodiment one, meet high level
The control requirement of the master chip of reset.And for the master chip that low level resets, a kind of design method is in embodiment one
Shown in add phase inverter on the basis of automatic reset circuit, the reset signal RESET that embodiment one generates is carried out at reverse phase
After reason, the effective reset signal/RESET of low level needed for master chip is generated.Embodiment may be used in another design method
Circuit structure shown in two.
Embodiment two, as shown in figure 3, the present embodiment is the selection of reset switch pipe with the difference design of embodiment one
On, the effective reset signal/RESET of low level can be generated.
The present embodiment uses P-channel metal-oxide-semiconductor Q4（Or PNP type triode）As the reset switch pipe, it is connected to straight
Between galvanic electricity source VCC and the reset pin of master chip.Specifically, the source electrode of P-channel metal-oxide-semiconductor Q4 can be connected to direct current
Source VCC, drain electrode connect the reset pin of master chip or are grounded by divider resistance R4, R5, pass through point of divider resistance R4, R5
Pressure node is connected to the reset pin of master chip.The grid of P-channel metal-oxide-semiconductor Q4 is connected to RC charging circuits, is specifically connected to
The anode of capacitance C4.When system program normal operation, when the normal output pwm signal of master chip, N-channel MOS pipe Q3 is in pwm signal
Control under be constantly connected, by most charging current for flowing to capacitance C4 branch to ground, so that the voltage on capacitance C4 is less than
Given threshold.The selection mode of the given threshold is：VCC- given thresholds>The conducting voltage of P-channel metal-oxide-semiconductor, so that P
Channel MOS tube Q4 saturation conductions during system program normal operation, it is in the invalid state of high level to make reset signal/RESET.
Since the master chip of the present embodiment is the master chip that low level resets, when reset signal/RESET is high level, main core
Piece will not enter reset state, keep system program normal operation.
And when system program crashes, master chip can not output pwm signal, at this point, N-channel MOS pipe Q3 cut-off, direct current
The charging current of source VCC outputs all flows to capacitance C4, so that the voltage on capacitance C4 is quickly increased, as the voltage V on capacitance C4C4
Meet condition：VCC-VC4<When the conducting voltage of P-channel metal-oxide-semiconductor, P-channel metal-oxide-semiconductor Q4 cut-offs, reset signal/RESET becomes low
The effective status of level, and then control the master chip that low level resets and enter reset state so that system program reset is restarted, real
The auto-reset function of existing electronic product.
In Fig. 3, capacitance C1, C2, C3 are filter capacitor, the stability for ensureing DC power supply VCC, are improved automatic multiple
The reliability of position circuit work.
The automatic hardware reset circuit of the utility model, it is simple in structure, it is at low cost, it resets reliably, is applied in intelligence
In the wearable devices such as wrist-watch, Intelligent bracelet or in other kinds of electronic product, better use can be provided to the user
Experience.
Certainly, the above description is not intended to limit the present invention, and the utility model is also not limited to the example above,
The variations, modifications, additions or substitutions that those skilled in the art are made in the essential scope of the utility model,
It should also belong to the protection scope of the utility model.
Claims (10)
1. a kind of automatic reset circuit, which is characterized in that including：
RC charging circuits connect DC power supply, are the capacitor charging in RC charging circuits using the DC power supply；
Reset switch pipe connects the RC charging circuits, and the voltage on capacitance in the RC charging circuits is more than setting
When threshold value, the reset switch pipe switches its on off operating mode, generates reset signal；
Shunt circuit connects the RC charging circuits, and only when receiving shunt control signal, to flowing to the capacitance
Charging current is shunted, and the voltage on the capacitance is made to be less than the given threshold；
Master chip, the system program of electronic product where running the automatic reset circuit, and in system program normal operation
Period exports the shunt control signal, stops exporting the shunt control signal when system program crashes, and receiving
When the reset signal, control system Program reset is restarted.
2. automatic reset circuit according to claim 1, which is characterized in that the switch ways of the reset switch pipe connect
Between the DC power supply and the reset pin of master chip, the control terminal of the reset switch pipe connects the RC charging circuits
In capacitance anode.
3. automatic reset circuit according to claim 2, which is characterized in that the reset switch Guan Weiyi N-channel MOSs
The drain electrode of pipe, the N-channel MOS pipe connects the DC power supply, and source electrode is connected to the reset pin of the master chip, grid connection
The anode of capacitance in the RC charging circuits；The given threshold is the conducting voltage of the N-channel MOS pipe.
4. automatic reset circuit according to claim 3, which is characterized in that further include bleeder circuit, be connected to the N ditches
Between the source electrode and ground of road metal-oxide-semiconductor, the divider node of the bleeder circuit connects the reset pin of the master chip.
5. automatic reset circuit according to claim 1, which is characterized in that be provided with a switch in the shunt circuit
Pipe, the switch ways of the switching tube are connected between the anode and ground of the capacitance in the RC charging circuits, described to open
The control terminal for closing pipe is connected to the master chip, when receiving the shunt control signal of master chip output, controls its switch
Access is connected to, and is diverted to ground by the part charging circuit for flowing to the capacitance.
6. automatic reset circuit according to claim 5, which is characterized in that the switching tube is N-channel MOS pipe, the N
The drain electrode of channel MOS tube connects the anode of the capacitance in the RC charging circuits, source electrode ground connection, and grid is connected to the main core
The pwm signal output end of piece receives the shunt control signal of the PWM forms of master chip output.
7. automatic reset circuit according to any one of claim 1 to 6, which is characterized in that in the RC charging circuits
In, resistance is connected between the DC power supply and the anode of the capacitance, the cathode ground connection of the capacitance.
8. automatic reset circuit according to any one of claim 1 to 6, which is characterized in that further include charging interface and
Battery；Charge power supply outside the charging interface reception, and as the transmitting DC to the RC charging circuits；Institute
It states battery and the RC charging circuits is connected by a switch element, the switch element is only on the charging interface without charging electricity
Source is connected to the battery and RC charging circuits when accessing, by the transmitting DC of battery output to the RC charging circuits.
9. automatic reset circuit according to claim 8, which is characterized in that the switch element is P-channel metal-oxide-semiconductor, institute
The grid for stating P-channel metal-oxide-semiconductor connects the charging interface, and source electrode connects the battery, and drain electrode connects the RC charging circuits.
10. a kind of electronic product, which is characterized in that including automatic reset circuit as claimed in any one of claims 1-9 wherein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820077904.8U CN207782762U (en) | 2018-01-17 | 2018-01-17 | A kind of automatic reset circuit and electronic product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820077904.8U CN207782762U (en) | 2018-01-17 | 2018-01-17 | A kind of automatic reset circuit and electronic product |
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| Publication Number | Publication Date |
|---|---|
| CN207782762U true CN207782762U (en) | 2018-08-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820077904.8U Withdrawn - After Issue CN207782762U (en) | 2018-01-17 | 2018-01-17 | A kind of automatic reset circuit and electronic product |
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| Country | Link |
|---|---|
| CN (1) | CN207782762U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108023582A (en) * | 2018-01-17 | 2018-05-11 | 歌尔科技有限公司 | A kind of automatic reset circuit and electronic product |
| CN109982147A (en) * | 2019-03-13 | 2019-07-05 | 青岛海信电器股份有限公司 | Resetting apparatus, reset processing method and display equipment |
| CN112578888A (en) * | 2020-12-08 | 2021-03-30 | 宁波厚德能源科技有限公司 | Singlechip is reset circuit independently |
| CN113300743A (en) * | 2021-05-21 | 2021-08-24 | 广东天波信息技术股份有限公司 | NFC service device and electronic equipment |
| WO2022116897A1 (en) * | 2020-12-02 | 2022-06-09 | 维沃移动通信有限公司 | Stylus |
-
2018
- 2018-01-17 CN CN201820077904.8U patent/CN207782762U/en not_active Withdrawn - After Issue
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108023582A (en) * | 2018-01-17 | 2018-05-11 | 歌尔科技有限公司 | A kind of automatic reset circuit and electronic product |
| CN108023582B (en) * | 2018-01-17 | 2024-01-30 | 歌尔科技有限公司 | Automatic reset circuit and electronic product |
| CN109982147A (en) * | 2019-03-13 | 2019-07-05 | 青岛海信电器股份有限公司 | Resetting apparatus, reset processing method and display equipment |
| CN109982147B (en) * | 2019-03-13 | 2020-09-29 | 海信视像科技股份有限公司 | Reset device, reset processing method and display equipment |
| WO2022116897A1 (en) * | 2020-12-02 | 2022-06-09 | 维沃移动通信有限公司 | Stylus |
| CN112578888A (en) * | 2020-12-08 | 2021-03-30 | 宁波厚德能源科技有限公司 | Singlechip is reset circuit independently |
| CN113300743A (en) * | 2021-05-21 | 2021-08-24 | 广东天波信息技术股份有限公司 | NFC service device and electronic equipment |
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