CN206211960U - A kind of electrical equipment reset circuit - Google Patents
A kind of electrical equipment reset circuit Download PDFInfo
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- CN206211960U CN206211960U CN201621200574.4U CN201621200574U CN206211960U CN 206211960 U CN206211960 U CN 206211960U CN 201621200574 U CN201621200574 U CN 201621200574U CN 206211960 U CN206211960 U CN 206211960U
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Abstract
The utility model discloses a kind of electrical equipment reset circuit, including bleeder circuit, reference voltage output circuit, comparator, discharge and recharge adjustment circuit, electric capacity and governor circuit feeder ear, reset pin connection end；Bleeder circuit includes voltage input end, partial pressure node and earth terminal；Voltage input end connects governor circuit feeder ear；One input of partial pressure Node connectedness comparator；The output end of reference voltage output circuit connects another input of comparator；Discharge and recharge adjustment circuit includes adjustment input and adjustment output end, the output end connection adjustment input of comparator；Adjustment output end connection reset pin connection end；The first end connection reset pin connection end of electric capacity, the second end ground connection of electric capacity.In high-speed switch machine or power network fluctuation, reset pin can export correct reset signal, and the time that MCU is effectively ensured abundance resets, and the normal work of MCU is not influenceed, it is to avoid make troubles to user.
Description
Technical field
The utility model is related to electronic technology field, especially, is related to a kind of electrical equipment reset circuit.
Background technology
The main control chip of some electrical equipment, often sets reset pin, the program inside MCU is held since original state
OK.In the prior art, during electrical equipment use, when high-speed switch machine or power network fluctuation, the feeder ear of governor circuit is had
The phenomenon of incomplete power down quick charge again, the voltage of reset pin do not discharge it is again upper electric, therefore reset pin resetting time
It is too short, cause MCU resetting times not enough, so as to cause MCU to crash, the control action to household electrical appliances is impacted, and need to pull out power supply
Electricity is gone up again, to user using making troubles.
Utility model content
The purpose of this utility model is to provide a kind of electrical equipment reset circuit, in high-speed switch machine or power network fluctuation,
Reset pin can export correct reset signal, and the time that MCU is effectively ensured abundance is resetted, and the normal work of MCU is not influenceed
Make, it is to avoid made troubles to user.
To achieve these goals, the utility model embodiment provides a kind of electrical equipment reset circuit, including bleeder circuit, base
Quasi- voltage follower circuit, comparator, discharge and recharge adjustment circuit, electric capacity, governor circuit feeder ear and reset pin connection end；
The bleeder circuit includes voltage input end, partial pressure node and earth terminal；The voltage input end connects the master
Control circuit feeder ear；The earth terminal ground connection；
One input of comparator described in the partial pressure Node connectedness；The output end of the reference voltage output circuit connects
Connect another input of the comparator；
The discharge and recharge adjustment circuit includes adjustment input and adjustment output end, the output end connection institute of the comparator
State adjustment input；The adjustment output end connects the reset pin connection end；
The first end of the electric capacity connects the reset pin connection end, the second end ground connection of the electric capacity.
Implement the utility model embodiment, have the advantages that：
The utility model embodiment, the voltage of governor circuit feeder ear is exported through bleeder circuit partial pressure, with reference voltage
The reference voltage of output circuit output is made comparisons, when voltage pulsation, as long as voltage is consistently less than or higher than a certain threshold value, compares
Device can keep output low level or keep output high level；By rationally setting discharge and recharge adjustment circuit, can in power network fluctuation but
Governor circuit powers terminal voltage when being consistently less than a certain threshold value, reset pin is exported low level, and in governor circuit feeder ear
When being raised from the fast quick-recovery of the voltage of fluctuation, reset pin need to be charged to high level from 0V to electric capacity, so that when MCU has abundance
Between reset；I.e. in high-speed switch machine or power network fluctuation, reset pin can export correct reset signal, and ensure MCU
The time for having abundance resets, and the normal work of MCU is not influenceed, it is to avoid make troubles to user.
Wherein in one embodiment, an input of comparator described in the partial pressure Node connectedness, specially：It is described
The inverting input of comparator described in partial pressure Node connectedness；The output end of the reference voltage output circuit connects the comparator
Another input, specially：The output end of the reference voltage output circuit connects the normal phase input end of the comparator；
Then the discharge and recharge adjustment circuit also includes the first power port, NPN triode and PNP triode；
First power port connects the governor circuit feeder ear；The emitter stage connection of the PNP triode is described
First power port, the colelctor electrode of the PNP triode connects the colelctor electrode of the NPN triode, the hair of the NPN triode
Emitter grounding；The base stage of the PNP triode connects the base stage of the NPN triode；The base stage connection institute of the NPN triode
Adjustment input is stated, the colelctor electrode of the NPN triode connects the adjustment output end.
In another embodiment, an input of comparator described in the partial pressure Node connectedness, specially：Described point
The normal phase input end of comparator described in pressure Node connectedness；The output end of the reference voltage output circuit connects the comparator
Another input, specially：The output end of the reference voltage output circuit connects the inverting input of the comparator；
Then the discharge and recharge adjustment circuit also includes first resistor；The first end connection adjustment of the first resistor is defeated
Enter end, the second end of the first resistor connects the adjustment output end.
Further, the reference voltage output circuit includes second source port, the 4th resistance and voltage-stabiliser tube；
The first end of the 4th resistance connects the second source port, and the second end connection of the 4th resistance is described
The negative pole of voltage-stabiliser tube, the plus earth of the voltage-stabiliser tube；
The negative pole of the voltage-stabiliser tube connects the output end of the reference voltage output circuit.
Further, the second source port connects the governor circuit feeder ear.
Further, the bleeder circuit also includes second resistance and 3rd resistor；The first end of the second resistance connects
The voltage input end is connect, the second end of the second resistance connects the first end of the 3rd resistor, the 3rd resistor
Second end connects the earth terminal；The first end of the 3rd resistor connects the partial pressure node.
Brief description of the drawings
Fig. 1 is the structured flowchart of the electrical equipment reset circuit that the utility model is provided；
Fig. 2 is the schematic diagram of the electrical equipment reset circuit embodiment one that the utility model is provided；
Fig. 3 is the schematic diagram of the electrical equipment reset circuit embodiment two that the utility model is provided.
Specific embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the utility model, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment for being obtained, belongs to the scope of the utility model protection.
It is the structured flowchart of the electrical equipment reset circuit that the utility model is provided referring to Fig. 1；Reset circuit, including partial pressure electricity
Road 101, reference voltage output circuit 102, comparator U1A, discharge and recharge adjustment circuit 103, electric capacity C1 and governor circuit feeder ear
VCC, reset pin connection end RESET；
Bleeder circuit 101 includes voltage input end, partial pressure node and earth terminal；The voltage input end connects governor circuit
Feeder ear VCC；The earth terminal ground connection；
One input of the partial pressure Node connectedness comparator U1A；The output end connection of reference voltage output circuit 102
Another input of comparator U1A；
Discharge and recharge adjustment circuit 103 includes adjustment input and adjustment output end, and the output end connection of comparator U1A is described
Adjustment input；The adjustment output end connection reset pin connection end RESET；
The second end ground connection of first end connection reset pin the connection end RESET, electric capacity C2 of electric capacity C1.
The utility model embodiment, the voltage of governor circuit feeder ear VCC is exported through the partial pressure of bleeder circuit 101, with base
The reference voltage of the output of quasi- voltage follower circuit 102 is made comparisons, when voltage pulsation, as long as voltage is consistently less than or higher than a certain
Threshold value, comparator U1A can keep output low level or keep output high level；By rationally setting discharge and recharge adjustment circuit 103,
Reset pin RESET can be made to export low electricity when power network fluctuation but governor circuit feeder ear VCC voltages are consistently less than a certain threshold value
It is flat, and when governor circuit feeder ear VCC is raised from the fast quick-recovery of voltage of fluctuation, reset pin need to be charged to from 0V to electric capacity
High level, so that MCU has grace time to reset；I.e. in high-speed switch machine or power network fluctuation, reset pin RESET can
Export correct reset signal, and the time for ensureing MCU and having abundance is resetted, and the normal work of MCU is not influenceed, it is to avoid to user with
It is inconvenient to come.
Embodiment one
It is the schematic diagram of the electrical equipment reset circuit embodiment one that the utility model is provided referring to Fig. 2；Bleeder circuit 101 can
To there is numerous embodiments, such as using two electric resistance partial pressures；Or using voltage-stabiliser tube and electric resistance partial pressure etc.；In the present embodiment,
Bleeder circuit 101 in addition to voltage input end, partial pressure node and earth terminal, also including second resistance R2 and 3rd resistor R3；Second
The first end of resistance R2 connects the voltage input end, and second end of second resistance R2 connects the first end of 3rd resistor R3, the
Second end of three resistance R3 connects the earth terminal；The first end of 3rd resistor R3 connects the partial pressure node.
Reference voltage output circuit 102 also has numerous embodiments, such as using voltage-stabiliser tube, voltage reference IC or voltage stabilizing electricity
Road output reference voltage；In the present embodiment, reference voltage output circuit 102 also includes second source port, the in addition to output end
Four resistance R4 and voltage-stabiliser tube；Wherein, power supply function is played in second source port, the 4th resistance R4 of series connection and voltage-stabiliser tube Z1 is had electricity
Stream passes through, so that the negative pole output reference voltage of voltage-stabiliser tube Z1；Specifically：
The first end of the 4th resistance R4 connects the second source port, and second end of the 4th resistance R4 connects the voltage stabilizing
The negative pole of pipe Z1, the plus earth of voltage-stabiliser tube Z1；
The negative pole of voltage-stabiliser tube Z1 connects the output end of the reference voltage output circuit 102.Further, the second source
Port connects the governor circuit feeder ear.Second source port connects the governor circuit feeder ear, can share power supply, saves
About power consumption.
Discharge and recharge adjustment circuit 103 is used to adjust the discharge and recharge time of electric capacity C1, it is also possible to adjust the height of level；This reality
In applying example, an input of partial pressure Node connectedness comparator U1A, specially：Partial pressure Node connectedness comparator U1A's is anti-phase defeated
Enter end；Another input of the output end connection comparator U1A of reference voltage output circuit 102, specially：Reference voltage is defeated
Go out the normal phase input end of the output end connection comparator U1A of circuit 102；I.e. when branch pressure voltage is more than reference voltage, comparator
U1A exports low level, when branch pressure voltage is less than reference voltage, comparator U1A output high level；
Then discharge and recharge adjustment circuit 102 also includes the first power port, NPN triode Q2 and PNP triode Q1；
The first power port connection governor circuit feeder ear VCC；The emitter stage connection described first of PNP triode Q1
Power port, the colelctor electrode of the colelctor electrode connection NPN triode Q2 of PNP triode Q1, the grounded emitter of NPN triode Q2；
The base stage of the base stage connection NPN triode Q2 of PNP triode Q1；The base stage of NPN triode Q2 connects the adjustment input,
The colelctor electrode of NPN triode Q2 connects the adjustment output end.When branch pressure voltage is more than reference voltage, comparator U1A outputs are low
During level, Q2 cut-offs, Q1 conductings, reset pin connection end RESET is high level；When branch pressure voltage is less than reference voltage, compare
During device U1A output high level, Q1 cut-offs, Q2 conductings, reset pin connection end RESET is low level；The totem of Q1 and Q2 compositions
Post circuit realiration discharge and recharge, making the voltage amplitude of reset pin connection end RESET has time delay, and comparator U1A is exported
Voltage is adjusted to relative level, it is ensured that reset pin connection end RESET exports correct reset signal.
The principle of discharge and recharge is realized according to totem-pote circuit according to the present embodiment, can also be by the just anti-phase of comparator U1A
The signal of input is exchanged, and the position of Q1 and Q2 is exchanged, and can equally play the effect for postponing RESET resetting times.
Embodiment two
Embodiment two is with the difference of embodiment one, an input of the partial pressure Node connectedness comparator U1A,
Specially：The normal phase input end of the partial pressure Node connectedness comparator U1A；The output end connection of reference voltage output circuit 102
Another input of comparator U1A, specially：The output end connection comparator U1A's of reference voltage output circuit 102 is anti-phase
Input；I.e. when branch pressure voltage is more than reference voltage, comparator U1A output high level, when branch pressure voltage is less than reference voltage
When, comparator U1A output low levels；
Because the output of low and high level is consistent with VCC, i.e., discharge and recharge adjustment circuit 102 need not adjust level just, only need
The adjustment discharge and recharge time；Then discharge and recharge adjustment circuit 102 also includes first resistor R1；The first end connection of first resistor R1 is described
Adjustment input, second end of first resistor R1 connects the adjustment output end.First resistor R1 and electric capacity C1 composition RC retardation ratios
Circuit, postpones RESET resetting times so that MCU has grace time to reset.
In embodiment two, the setting of bleeder circuit 101 and reference voltage output circuit can be with setting described in embodiment one
Put mode consistent, will not be repeated here.
The utility model embodiment, the voltage of governor circuit feeder ear is exported through bleeder circuit partial pressure, with reference voltage
The reference voltage of output circuit output is made comparisons, when voltage pulsation, as long as voltage is consistently less than or higher than a certain threshold value, compares
Device can keep output low level or keep output high level；By rationally setting discharge and recharge adjustment circuit, can in power network fluctuation but
Governor circuit powers terminal voltage when being consistently less than a certain threshold value, reset pin is exported low level, and in governor circuit feeder ear
When being raised from the fast quick-recovery of the voltage of fluctuation, reset pin need to be charged to high level from 0V to electric capacity, so that when MCU has abundance
Between reset；I.e. in high-speed switch machine or power network fluctuation, reset pin can export correct reset signal, and ensure MCU
The time for having abundance resets, and the normal work of MCU is not influenceed, it is to avoid make troubles to user.
Above is preferred embodiment of the present utility model, it is noted that for those skilled in the art
For, on the premise of the utility model principle is not departed from, some improvement and deformation can also be made, these improve and deform
It is considered as protection domain of the present utility model.
Claims (6)
1. a kind of electrical equipment reset circuit, it is characterised in that including bleeder circuit, reference voltage output circuit, comparator, discharge and recharge
Adjustment circuit, electric capacity, governor circuit feeder ear and reset pin connection end；
The bleeder circuit includes voltage input end, partial pressure node and earth terminal；The voltage input end connects the master control electricity
Road feeder ear；The earth terminal ground connection；
One input of comparator described in the partial pressure Node connectedness；The output end connection institute of the reference voltage output circuit
State another input of comparator；
The discharge and recharge adjustment circuit includes adjustment input and adjustment output end, and the output end of the comparator connects the tune
Whole input；The adjustment output end connects the reset pin connection end；
The first end of the electric capacity connects the reset pin connection end, the second end ground connection of the electric capacity.
2. electrical equipment reset circuit as claimed in claim 1, it is characterised in that the one of comparator described in the partial pressure Node connectedness
Individual input, specially：The inverting input of comparator described in the partial pressure Node connectedness；The reference voltage output circuit
Output end connects another input of the comparator, specially：The output end connection institute of the reference voltage output circuit
State the normal phase input end of comparator；
Then the discharge and recharge adjustment circuit also includes the first power port, NPN triode and PNP triode；
First power port connects the governor circuit feeder ear；The emitter stage connection described first of the PNP triode
Power port, the colelctor electrode of the PNP triode connects the colelctor electrode of the NPN triode, the emitter stage of the NPN triode
Ground connection；The base stage of the PNP triode connects the base stage of the NPN triode；The base stage of the NPN triode connects the tune
Whole input, the colelctor electrode of the NPN triode connects the adjustment output end.
3. electrical equipment reset circuit as claimed in claim 1, it is characterised in that the one of comparator described in the partial pressure Node connectedness
Individual input, specially：The normal phase input end of comparator described in the partial pressure Node connectedness；The reference voltage output circuit
Output end connects another input of the comparator, specially：The output end connection institute of the reference voltage output circuit
State the inverting input of comparator；
Then the discharge and recharge adjustment circuit also includes first resistor；The first end connection adjustment input of the first resistor
End, the second end of the first resistor connects the adjustment output end.
4. the electrical equipment reset circuit as described in any one of claims 1 to 3, it is characterised in that the reference voltage output circuit
Including second source port, the 4th resistance and voltage-stabiliser tube；
The first end of the 4th resistance connects the second source port, and the second end of the 4th resistance connects the voltage stabilizing
The negative pole of pipe, the plus earth of the voltage-stabiliser tube；
The negative pole of the voltage-stabiliser tube connects the output end of the reference voltage output circuit.
5. electrical equipment reset circuit as claimed in claim 4, it is characterised in that the second source port connects the master control electricity
Road feeder ear.
6. the electrical equipment reset circuit as described in any one of claims 1 to 3, it is characterised in that the bleeder circuit also includes the
Two resistance and 3rd resistor；The first end of the second resistance connects the voltage input end, the second end of the second resistance
The first end of the 3rd resistor is connected, the second end of the 3rd resistor connects the earth terminal；The of the 3rd resistor
One end connects the partial pressure node.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621200574.4U CN206211960U (en) | 2016-11-04 | 2016-11-04 | A kind of electrical equipment reset circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621200574.4U CN206211960U (en) | 2016-11-04 | 2016-11-04 | A kind of electrical equipment reset circuit |
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| Publication Number | Publication Date |
|---|---|
| CN206211960U true CN206211960U (en) | 2017-05-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621200574.4U Active CN206211960U (en) | 2016-11-04 | 2016-11-04 | A kind of electrical equipment reset circuit |
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| CN (1) | CN206211960U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111641406A (en) * | 2020-06-30 | 2020-09-08 | 湖南中车时代通信信号有限公司 | Power-off restart automatic control circuit |
-
2016
- 2016-11-04 CN CN201621200574.4U patent/CN206211960U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111641406A (en) * | 2020-06-30 | 2020-09-08 | 湖南中车时代通信信号有限公司 | Power-off restart automatic control circuit |
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