CN206226401U - A kind of delay protection circuit - Google Patents
A kind of delay protection circuit Download PDFInfo
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- CN206226401U CN206226401U CN201621281606.8U CN201621281606U CN206226401U CN 206226401 U CN206226401 U CN 206226401U CN 201621281606 U CN201621281606 U CN 201621281606U CN 206226401 U CN206226401 U CN 206226401U
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Abstract
The utility model embodiment discloses a kind of delay protection circuit, is related to power technology.The delay protection circuit includes：Partial pressure sub-circuit, time delay sub-circuit and feedback sub-circuit；Partial pressure sub-circuit and power electric connection, for exporting the supply voltage after partial pressure to time delay sub-circuit；Time delay sub-circuit and power electric connection, including triode, the base stage of triode are electrically connected with partial pressure sub-circuit, for the supply voltage and the conducting voltage of triode after partial pressure to be compared, reset voltage signal to electrical equipment are exported according to comparative result；Feedback sub-circuit is electrically connected with partial pressure sub-circuit and time delay sub-circuit respectively, is exported to the voltage signal of time delay sub-circuit for locking partial pressure sub-circuit.The current delay protection circuit of the utility model embodiment solution can not realize the delay protection during power or power-down; and the problem of latency requirement under various complex situations can not be met; have the advantages that reliability is high, meet the related airworthiness requirement of aeronautical product.
Description
Technical field
The utility model embodiment is related to power technology, more particularly to a kind of realizes electric protection or the time delay of power down protection
Protection circuit.
Background technology
Microprocessor has been widely used in many fields as the programmable special integrated circuit of one kind.In microprocessor
, it is necessary to design the various circuits with power or power-down defencive function in device or similar products, existed with preventing microprocessor
Non-normal working under low voltage condition, causes situation that is badly damaged or endangering other equipment associated therewith.
Some protection circuits of the prior art realize time delay power or power-down defencive function by RC resistance-capacitance circuits, but
It is, in the transient process for rising on the supply voltage or declining, microprocessor anon-normal inevitably under low voltage condition
Normal working condition.Also some protection circuits carry out electric protection or power down protection by delay chip (such as LM555 chips).
But, because the delay time of delay chip is fixed, in fact it could happen that the situation that delay time is long or delay time is not enough, it is impossible to
Meet the latency requirement under various complex situations.
Utility model content
The utility model provides a kind of delay protection circuit, to realize carrying out delayed protection or power down to electrical equipment
The function of delay protection.
The utility model embodiment provides a kind of delay protection circuit, including：Partial pressure sub-circuit, time delay sub-circuit and anti-
Feedback sub-circuit；
The partial pressure sub-circuit and power electric connection, for exporting the supply voltage after partial pressure to the time delay sub-circuit；
The time delay sub-circuit and power electric connection, the base stage of the triode are electrically connected with the partial pressure sub-circuit, are used
The conducting voltage of supply voltage and triode after by partial pressure is compared, and reset voltage signal is exported extremely according to comparative result
Electrical equipment；
The feedback sub-circuit is electrically connected with the partial pressure sub-circuit and the time delay sub-circuit respectively, described for locking
Partial pressure sub-circuit is exported to the voltage signal of the time delay sub-circuit.
Further, the partial pressure sub-circuit includes first resistor, second resistance and the first electric capacity；
The first resistor and the second resistance are in series between the power supply and ground；
First electric capacity is in parallel with the second resistance.
Further, the feedback sub-circuit includes 3rd resistor；
One end of the 3rd resistor connects the common port of the first resistor and the second resistance, other end connection institute
State the output end of time delay sub-circuit.
Further, at least one of the first resistor, second resistance, 3rd resistor are variable resistance.
Further, the time delay sub-circuit includes the 4th resistance, the 5th resistance, power conversion chip, the first triode
With the second triode；
The base stage of first triode connects the common port of the first resistor and the second resistance, colelctor electrode connection
The base stage of second triode, the colelctor electrode of first triode is connected with the common port of the base stage of second triode
The power supply, the grounded emitter of first triode and second triode are connected after 4th resistance；
The output end of the power conversion chip is connected after colelctor electrode series connection the 5th resistance of second triode,
The colelctor electrode of second triode is also connected with the 3rd resistor；
The input of the power conversion chip connects the power supply.
Further, first triode and the second triode are NPN type triode.
The delay protection circuit that the utility model embodiment is provided includes partial pressure sub-circuit, time delay sub-circuit and feedback son electricity
Road, when realization is raised to a certain voltage on the supply voltage, makes the voltage of the electrical equipment be setting work electricity by 0 volt of step
Pressure, electrical equipment is started working, or when supply voltage drops to a certain voltage, the voltage of electrical equipment is by operating voltage step
It it is 0 volt, electrical equipment enters reset state, so as to during avoiding power or power-down, electrical equipment is in non-normal working shape
The situation of state.The utility model embodiment solves current delay protection circuit and can not realize prolonging during power or power-down
When protect, and the problem of latency requirement under various complex situations can not be met, microprocessor is realized using pure analog circuit
Or the delay protection of similar electrical equipment, it is operated under the conditions of the operating voltage of regulation using electric equipment, with reliability
Advantage high, meets the related airworthiness requirement of aeronautical product.
Brief description of the drawings
Fig. 1 is the theory diagram of the delay protection circuit that the utility model embodiment is provided；
Fig. 2 is the circuit theory diagrams of the delay protection circuit that the utility model embodiment is provided.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples.It is understood that herein
Described specific embodiment is used only for explanation the utility model, rather than to restriction of the present utility model.Further need exist for
It is bright, for the ease of description, part rather than the entire infrastructure related to the utility model is illustrate only in accompanying drawing.
Embodiment one
The theory diagram of the delay protection circuit that Fig. 1 is provided for the utility model embodiment, the present embodiment is applicable to
The situation of power or power-down protection when being powered for microprocessor or similar products.As shown in figure 1, the delay protection of the present embodiment
Circuit includes：Partial pressure sub-circuit 110, time delay sub-circuit 120 and feedback sub-circuit 130.Wherein,
The partial pressure sub-circuit 110 and power electric connection, for exporting the supply voltage after partial pressure to time delay son electricity
Road 120.
The time delay sub-circuit 120 and power electric connection, including triode, the base stage of the triode and partial pressure
Circuit 110 is electrically connected, defeated according to comparative result for the supply voltage and the conducting voltage of triode after partial pressure to be compared
Go out reset voltage signal to electrical equipment.Exemplarily, the supply voltage after the output partial pressure of partial pressure sub-circuit 110 is less than three poles
During the conducting voltage of pipe, output reset signal is 0, and electrical equipment is in reset state.After the output partial pressure of partial pressure sub-circuit 110
Supply voltage higher than triode conducting voltage when, output reset signal be 1, electrical equipment is in running order.So as to real
Existing electrical equipment is directly changed into working condition from reset state, or, reset state is directly changed into from working condition, it is to avoid power supply
During power or power-down, electrical equipment is caused to work in the situation of abnormal condition because supply voltage is slowly varying.
The feedback sub-circuit 130 is electrically connected with the partial pressure sub-circuit 110 and the time delay sub-circuit 120 respectively, is used
Exported to the voltage signal of the time delay sub-circuit 120 in the partial pressure sub-circuit 110 is locked, realize input time delay sub-circuit
The voltage step of transistor base is to a certain fixed voltage in 120, it is to avoid the voltage of input transistor base is in triode PN junction
Shaken near voltage, reach the purpose of locked reset voltage signal.
The delay protection circuit that the utility model embodiment is provided includes partial pressure sub-circuit 110, time delay sub-circuit 120 and anti-
Feedback sub-circuit 130, when realization is raised to a certain voltage on the supply voltage, makes the voltage of the electrical equipment by 0 volt of step to set
Fixed working voltage, electrical equipment is started working, or when supply voltage drops to a certain voltage, the voltage of electrical equipment is by working
Voltage step is 0 volt, and electrical equipment enters reset state, so as to during avoiding power or power-down, electrical equipment is in anon-normal
The situation of normal working condition.The utility model embodiment solves current delay protection circuit and can not realize power or power-down process
In delay protection, also solving current delay protection circuit can not meet asking for latency requirement under various complex situations
Topic, the delay protection of microprocessor or similar electrical equipment is realized using pure analog circuit, using electric equipment in the work for specifying
It is operated under voltage conditions, has the advantages that reliability is high, meets the related airworthiness requirement of aeronautical product.
Fig. 2 is the circuit theory diagrams of the delay protection circuit that the utility model embodiment is provided.As shown in Fig. 2 partial pressure is sub
Circuit includes first resistor R1, second resistance R2 and the first electric capacity C1.First resistor R1 and second is in series between power supply and ground
R2, the first electric capacity C1 are in parallel with second resistance R2 for resistance.The bleeder circuit that first resistor R1 and second resistance R2 are constituted is by power supply
After voltage signal POWER partial pressures, output to delay protection sub-circuit.First electric capacity C1 is connected in parallel on the two ends of second resistance R2, real
Now stablize the voltage of T1 points (common port of first resistor R1 and second resistance R2).
Feedback sub-circuit includes 3rd resistor R3, one end connection first resistor R1's and second resistance R2 of 3rd resistor R3
Common port T1, the other end connects the output end T3 of time delay sub-circuit, for latching T3 point voltages.
First resistor R1, second resistance R2 and 3rd resistor R3 constitute resistance pressure-dividing network.Exemplary, first resistor
R1, second resistance R2 and 3rd resistor R3 are the resistance of fixed resistance value, and its resistance is set by microprocessor or similar electrical equipment
Delay time specified in meter determines, it is ensured that the accuracy of time delay.Therefore, it can the delay time according to different electrical equipments
Regulation, selection first resistor R1, second resistance R2 and 3rd resistor R3, to meet the latency requirement under various complex situations.
Alternately, at least one of the first resistor R1, second resistance R2,3rd resistor R3 are variable resistor
Device.
Time delay sub-circuit includes the 4th resistance R4, the 5th resistance R5, power conversion chip N1, the first triode V1 and second
Triode V2.
The base stage of the first triode V1 connects the common port T1 of first resistor R1 and second resistance R2, colelctor electrode connection second
The base stage of triode V2, the colelctor electrode of the first triode V1 is connected the 4th resistance with the common port T2 of the base stage of the second triode V2
Power supply, the grounded emitter of the first triode V1 are connected after R4.Wherein, the first triode V1 is NPN type triode.
The output end (T4) of power conversion chip N1 is connected after the 5th resistance R5 of colelctor electrode series connection of the second triode V2
The colelctor electrode of Vout, the second triode V2 is also connected with 3rd resistor R3, the grounded emitter of the second triode V2.Wherein, second
The colelctor electrode of triode V2 also serves as the output end T3 of delay protection sub-circuit simultaneously, and output reset voltage signal (RESET) is extremely
Microprocessor.Second triode V2 is NPN type triode.
The input Vin of power conversion chip N1 connects the power supply.
The operation principle of the delay protection circuit shown in Fig. 2 is as follows：
Under electrifying condition, the output voltage quilt after being processed through power conversion chip N1 due to power supply voltage signal POWER
Exported to the colelctor electrode of the second triode V2 after 5th resistance R5 partial pressures, voltage after the 5th resistance R5 partial pressures is higher than the two or three
During PN junction voltage (conducting voltage of the second triode V2, usual value is 0.5~0.7V) of pole pipe V2, at the second triode V2
In conducting state, T3 point voltages are about 0V (because the second triode V2 is operated in depth saturation region, T3 points voltage is 0.3V).By
There is gradually increased process in power supply voltage signal POWER, at the beginning of power supply electrifying, power supply voltage signal POWER is through first
After resistance R1 and second resistance R2 partial pressures, (the first triode V1's leads PN junction voltage of the T1 points voltage less than the first triode V1
Be powered pressure, and usual value is 0.5~0.7V), the first triode V1 is in cut-off state.Now, power conversion chip N1's is defeated
Go out to hold the voltage of T4 points to be gradually increasing with the increase of power supply voltage signal POWER, but because the second triode V2 is on
State, it is 0V that T3 point voltages are clamped down on, and microprocessor is in reset state, does not work.
With the rising of power supply voltage signal POWER, second resistance R2 and 3rd resistor R3 parallel connection after, then with first resistor
R1 bleeder circuits in series, partial pressure is carried out by the bleeder circuit to power supply voltage signal POWER.When T1 points voltage is higher than the
During the PN junction voltage of one triode V1, the first triode V1 is in the conduction state, and Uce is about 0V (due to the first triode V1 works
It is 0.3V to make the voltage difference between depth saturation region, the colelctor electrode and emitter stage of the first triode V1), i.e. T2 point voltages are clamped
It is made as 0V.Therefore, the second triode V2 is in cut-off state.Now, T3 points voltage step is T4 point voltages, and microprocessor is in
Working condition, realize operating voltage of the T3 point voltages by the direct steps of 0V to microprocessor, it is to avoid upper electricity it is slow during,
Microprocessor work is in the situation of abnormal condition.
Under power-down conditions, by after first resistor R1 and 3rd resistor R3 parallel connections then in series with second resistance R2
Bleeder circuit.Partial pressure is carried out to power supply voltage signal POWER by the bleeder circuit.With the drop of power supply voltage signal POWER
Low, T1 point voltages are gradually reduced, and when T1 points voltage is less than the PN junction voltage of the first triode V1, the first triode V1 is in and cuts
Only state, T2 point voltage steps are the conducting voltage of the second triode V2.Second triode V2 is in the conduction state, T3 point voltages
It is 0V to be clamped down on, and microprocessor does not work in reset state.Now, after second resistance R2 and 3rd resistor R3 parallel connections, then with
First resistor R1 bleeder circuits in series carry out partial pressure to power supply voltage signal POWER, drop to T1 point voltage step formulas
A certain fixed voltage, it is to avoid T1 point voltages are shaken near the conducting voltage of the first triode V1, realize the first triode V1's
Working condition is locked in cut-off state, so that locked T3 point output voltages.
By adjusting the resistance of first resistor R1, second resistance R2 and 3rd resistor R3, can control the delayed time,
Microprocessor stops when microprocessor start-up operation or supply voltage drop to a certain voltage when supply voltage rises to a certain voltage
Only work, so that microprocessor works under the conditions of the operating voltage that designer specifies, it is to avoid produced during power or power-down
Raw abnormal working position.
Note, above are only preferred embodiment of the present utility model and institute's application technology principle.Those skilled in the art's meeting
Understand, the utility model is not limited to specific embodiment described here, can carry out for a person skilled in the art various bright
Aobvious change, readjust and substitute without departing from protection domain of the present utility model.Therefore, although by above example
The utility model is described in further detail, but the utility model is not limited only to above example, is not departing from
In the case that the utility model is conceived, more other Equivalent embodiments can also be included, and scope of the present utility model is by appended
Right determine.
Claims (6)
1. a kind of delay protection circuit, it is characterised in that including：Partial pressure sub-circuit, time delay sub-circuit and feedback sub-circuit；
The partial pressure sub-circuit and power electric connection, for exporting the supply voltage after partial pressure to the time delay sub-circuit；
The time delay sub-circuit and power electric connection, including triode, the base stage of the triode and partial pressure sub-circuit electricity
Connection, for the supply voltage and the conducting voltage of triode after partial pressure to be compared, resets electric according to comparative result output
Press signal to electrical equipment；
The feedback sub-circuit is electrically connected with the partial pressure sub-circuit and the time delay sub-circuit respectively, for locking the partial pressure
Sub-circuit is exported to the voltage signal of the time delay sub-circuit.
2. delay protection circuit according to claim 1, it is characterised in that the partial pressure sub-circuit include first resistor,
Second resistance and the first electric capacity；
The first resistor and the second resistance are in series between the power supply and ground；
First electric capacity is in parallel with the second resistance.
3. delay protection circuit according to claim 2, it is characterised in that the feedback sub-circuit includes 3rd resistor；
One end of the 3rd resistor connects the common port of the first resistor and the second resistance, prolongs described in other end connection
When sub-circuit output end.
4. delay protection circuit according to claim 3, it is characterised in that the first resistor, second resistance, the 3rd electricity
At least one of resistance is variable resistance.
5. delay protection circuit according to claim 3, it is characterised in that the time delay sub-circuit include the 4th resistance,
5th resistance, power conversion chip, the first triode and the second triode；
The base stage of first triode connects the common port of the first resistor and the second resistance, and colelctor electrode connection is described
The base stage of the second triode, the colelctor electrode of first triode connects the 4th with the common port of the base stage of second triode
The power supply, the grounded emitter of first triode and second triode are connected after resistance；
The output end of the power conversion chip is connected after colelctor electrode series connection the 5th resistance of second triode, it is described
The colelctor electrode of the second triode is also connected with the 3rd resistor；
The input of the power conversion chip connects the power supply.
6. delay protection circuit according to claim 5, it is characterised in that first triode and the second triode are
NPN type triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621281606.8U CN206226401U (en) | 2016-11-23 | 2016-11-23 | A kind of delay protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621281606.8U CN206226401U (en) | 2016-11-23 | 2016-11-23 | A kind of delay protection circuit |
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| Publication Number | Publication Date |
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| CN206226401U true CN206226401U (en) | 2017-06-06 |
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| CN201621281606.8U Active CN206226401U (en) | 2016-11-23 | 2016-11-23 | A kind of delay protection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110289843A (en) * | 2019-05-30 | 2019-09-27 | 华为技术有限公司 | A kind of reset system of Outdoor Device Unit |
-
2016
- 2016-11-23 CN CN201621281606.8U patent/CN206226401U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110289843A (en) * | 2019-05-30 | 2019-09-27 | 华为技术有限公司 | A kind of reset system of Outdoor Device Unit |
| WO2020238872A1 (en) * | 2019-05-30 | 2020-12-03 | 华为技术有限公司 | Reset system of outdoor device unit |
| US11703925B2 (en) | 2019-05-30 | 2023-07-18 | Huawei Technologies Co., Ltd. | Outdoor device unit reset system |
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