CN108494239B - A kind of highly sensitive quick discharging circuit - Google Patents
A kind of highly sensitive quick discharging circuit Download PDFInfo
- Publication number
- CN108494239B CN108494239B CN201810343246.7A CN201810343246A CN108494239B CN 108494239 B CN108494239 B CN 108494239B CN 201810343246 A CN201810343246 A CN 201810343246A CN 108494239 B CN108494239 B CN 108494239B
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- circuit module
- resistance
- discharge
- triode
- trigger
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/322—Means for rapidly discharging a capacitor of the converter for protecting electrical components or for preventing electrical shock
Abstract
The invention discloses a kind of highly sensitive quick discharging circuits, including sampling hold circuit module, trigger circuit module, feed circuit module and discharge circuit module, the holding sample circuit module is connected with the trigger circuit module, the feed circuit module and the discharge circuit module respectively, the acquisition and deposit that sample circuit module is kept for realizing energy, when the trigger circuit module generates effective trigger signal, certain energy is provided and drives the feed circuit module and discharge circuit module work；The trigger circuit module is for generating trigger signal and being sent to the feed circuit module and the discharge circuit module；The feed circuit module is used to generate effective booting enable signal after the completion of discharge circuit module electric discharge；The discharge circuit module is used for repid discharge.
Description
Technical field
The present invention relates to Smart Home technical fields, and in particular to a kind of highly sensitive quick discharging circuit.
Background technique
With the development of technology, people's lives become more and more intelligent, in addition to common smart phone, tablet computer
Etc. outside handheld devices, the smart homes product such as intelligent air condition, intelligent sound box, intelligent washing machine steps into people's lives
In.Existing major part "smart" products are all integrated with the embedded system of high disposal performance, which has high collection
The functional module groups such as CPU, GPU, memory, PMU of Cheng Du, while also running Linux Android intelligent operation system
System.With the promotion of present electronic technology, integrated circuit technique, manufacturing process, the integrated level of IC is higher and higher, intelligent electronic
The operating voltage and power consumption of system are also lower and lower.However, in these powerful intelligent residence products, often in addition to weak
Other than the intelligent electric subsystem of electricity, under the high-power dynamical system generally all to work under forceful electric power, therefore, such product is general
It is all to directly adopt Alternating Current Power Supply.When encounter alternating current power off suddenly then immediately send a telegram here again when, strong power system is because biggish negative
Load can be completed in a short time electric discharge and restart, and weak electricity system, in a short time can not be quickly complete because load is smaller
It may cause internal logic circuit at electric discharge, when re-powering not reset, thus the phenomenon that system can not start occur.More than
Although problem is a kind of small probability event, but if really occurred, user can take for damage of product, even if again can be extensive
It is multiple normal, inevitably also influence whether that client to the satisfaction of product, to damage the brand image of product, while being also possible to increase
Add unnecessary troublesome after sale, problems should be corrected as design deficiency of product.
As depicted in figs. 1 and 2, there are two types of schemes for existing common discharge circuit design:
The first scheme be directly pulled down to by simple resistance (hereinafter referred option A).
Second scheme is discharged by triode+current-limiting resistance (hereinafter referred option b).
Existing discharge circuit has the following disadvantages:
1) response sensitivity is low
Although option A can be described as 0 delay quick response, but because it always exists loss function when system works
Consumption, it is not energy-efficient therefore undesirable；The response speed of option b depends on the power down speed of the connect power supply VCC of triode Q4 base stage,
And the base control signal of triode Q5 derive from triode Q4 collector, triode Q5 conducting condition be emitter just
Partially, thus VCC must power down amplitude at least more than 1V when can set out triode Q4 conducting, and then trigger triode Q5 be connected
(taking Veb=0.7V, Vd >=0.3V), power supply VCC1 just starts power down.So the responsiveness of this discharge circuit is fallen depending on VCC
The time of electric 1V, power down amplitude requirement is too big, and sensitivity need to be improved.
2) safety coefficient is not achieved 100%, when power-up speeds are sufficiently fast after a power failure, and still presence cannot normally start
Risk
Existing two schemes, the time only re-powered after power down have to be larger than needed for the discharge circuit is discharged
Time when, discharge circuit could be completed to discharge, can 100% guarantee discharge can normally restart completely, but after power down
When the time needed for the time re-powered is less than the discharge circuit, equipment there is the risk that can not start, therefore, existing side
The safety coefficient of case be not achieved 100% it is reliable.
Although existing technical solution similarly has the effect of shutdown electric discharge, in sensitivity and safety,
It is to be improved.
Summary of the invention
The technical problem to be solved in the present invention is that in view of the deficiencies of the prior art, providing a kind of highly sensitive repid discharge
Circuit overcomes the shutdown defect that discharge circuit sensitivity is low, safety is not high of the prior art.
The present invention to solve above-mentioned technical problem used by technical solution are as follows:
A kind of highly sensitive quick discharging circuit, including sampling hold circuit module, trigger circuit module, feed circuit module
And discharge circuit module, the holding sample circuit module respectively with the trigger circuit module, the feed circuit module and
The discharge circuit module is connected, the acquisition and deposit for keeping sample circuit module for realizing energy, in the triggering
When circuit module generates effective trigger signal, certain energy is provided and drives the feed circuit module and the discharge circuit
Module work；The trigger circuit module is for generating trigger signal and being sent to the feed circuit module and electric discharge electricity
Road module；The feed circuit module is used to generate effective booting enabled letter after the completion of discharge circuit module electric discharge
Number；The discharge circuit module is used for repid discharge.
According to an embodiment of the invention, the sampling hold circuit module includes resistance R1, resistance R3, capacitor C1, two poles
The one end pipe D1, resistance R1 is connected to power supply VCC1, and one end is connected to the anode of resistance R3 and diode D1, the other end of resistance R3
Ground connection, the cathode of diode D1 connect the trigger circuit module, the other end ground connection of capacitor C1 with one end copolar of capacitor C1.
According to an embodiment of the invention, the trigger circuit module includes resistance R2, capacitor C2, triode Q1, resistance R2
One end connects power supply VCC2, and the resistance R2 other end connects one end of capacitor C2 and the base stage of triode Q1, the other end of capacitor C2
Ground connection, the emitter of triode Q1 connect the sampling hold circuit module, and the collector of triode Q1 connects the feedback electricity
Road module and the discharge circuit module.
According to an embodiment of the invention, the feed circuit module includes resistance R4 and triode Q3, the one end resistance R4 connects
The trigger circuit module is connect, the resistance R4 other end is connected with the base stage of triode Q3, the emitter ground connection of triode Q3, three poles
The collector output booting enable signal of pipe Q3.
According to an embodiment of the invention, the discharge circuit module includes resistance R5 and field-effect tube Q2, the one of resistance R5
End connects the trigger circuit module, the grid of the other end connection field-effect tube Q2 of resistance R5, and the drain electrode of field-effect tube Q2 connects
Connect power supply VCC2, the source electrode ground connection of field-effect tube Q2.
According to an embodiment of the invention, the transmitting of one end copolar connecting triode Q1 of the cathode of diode D1 and capacitor C1
Pole.
According to an embodiment of the invention, the copolar end of the collector connection resistance R4 and resistance R5 of triode Q1.
Implement technical solution of the present invention, has the advantages that discharge circuit of the present invention has better safety
And sensitivity, it discharges with 100% safety coefficient, while using metal-oxide-semiconductor, the velocity of discharge is fast, can substantially reduce energy storage electricity
The capacitance of appearance, thus it is more efficient and cheap.
Detailed description of the invention
It is specifically described the present invention below with reference to attached drawing and in conjunction with example, advantages of the present invention and implementation will
It is more obvious, wherein content only for the purpose of explanation of the present invention shown in attached drawing, without constitute to it is of the invention in all senses
On limitation, in the accompanying drawings:
Fig. 1 is one of prior art discharge circuit；
Fig. 2 is the two of prior art discharge circuit；
Fig. 3 is the highly sensitive quick discharging circuit module map of the present invention；
Fig. 4 is the highly sensitive quick discharging circuit embodiment of the present invention.
Specific embodiment
As shown in Figure 3 and Figure 4, the highly sensitive quick discharging circuit of the present invention includes sampling hold circuit module, trigger circuit
Module, feed circuit module and discharge circuit module, the holding sample circuit module respectively with the trigger circuit module, institute
Feed circuit module is stated to be connected with the discharge circuit module, it is described keep sample circuit module for realizing energy acquisition and
Deposit provides certain energy and drives the feed circuit mould when the trigger circuit module generates effective trigger signal
Block and discharge circuit module work；The trigger circuit module is for generating trigger signal and being sent to the feed circuit
Module and the discharge circuit module；The feed circuit module is used to have after the completion of discharge circuit module electric discharge
The booting enable signal of effect；The discharge circuit module is used for repid discharge.According to an embodiment of the invention, the sampling is kept
Circuit module includes resistance R1, resistance R3, capacitor C1, diode D1, and the one end resistance R1 is connected to power supply VCC1, and one end is connected to
The anode of resistance R3 and diode D1, the other end ground connection of resistance R3, the cathode of diode D1 and one end copolar of capacitor C1 connect
Connect the trigger circuit module, the other end ground connection of capacitor C1.The trigger circuit module includes resistance R2, capacitor C2, three poles
Pipe Q1, the one end resistance R2 connect power supply VCC2, and the resistance R2 other end connects one end of capacitor C2 and the base stage of triode Q1, capacitor
The other end of C2 is grounded, and the emitter of triode Q1 connects the sampling hold circuit module, the collector connection of triode Q1
The feed circuit module and the discharge circuit module.The feed circuit module includes resistance R4 and triode Q3, resistance
The one end R4 connects the trigger circuit module, and the resistance R4 other end is connected with the base stage of triode Q3, the emitter of triode Q3
Ground connection, the collector output booting enable signal of triode Q3.The discharge circuit module includes resistance R5 and field-effect tube Q2,
One end of resistance R5 connects the trigger circuit module, the grid of the other end connection field-effect tube Q2 of resistance R5, field-effect tube
The drain electrode of Q2 connects power supply VCC2, the source electrode ground connection of field-effect tube Q2.The cathode of diode D1 and one end copolar of capacitor C1 connect
Connect the emitter of triode Q1.The copolar end of the collector connection resistance R4 and resistance R5 of triode Q1.
Circuit composition:
Power supply: power supply VCC2 is to be discharged power supply, is converted by VCC1 power supply.
Sampling hold circuit: by resistance R1, R3, capacitor C1, diode D1 composition, the one end resistance R1 is connected to power supply
VCC1, one end are connected to the anode of R3 and D1, the other end ground connection of R3, and the cathode and capacitor C1 of D1 is connected to trigger circuit.Electricity
The effect for holding C1 is energy storage, provides energy for the work of late-class circuit；The effect of resistance R1, resistance R3 are bleeder circuits, are adjusted
The holding voltage of capacitor C1, to realize the activation threshold value voltage for adjusting sampling hold circuit.
Trigger circuit: it is made of resistance R2, capacitor C2, triode Q1, mono- end resistance R2 is connected to power supply VCC2, another termination
The other end of the base stage of capacitor C2 and triode Q1, capacitor C2 is directly grounded, and the transmitter of triode Q1 is connected to sampling and keeps electricity
Road, collector are connected to the feed circuit and discharge circuit of rear class.The effect of resistance R2 is current limliting, and the effect of capacitor C2 is filtering,
The false triggering of interference signal is avoided, triode Q1 realizes the generation of trigger signal.
Feed circuit: being made of resistance R4 and triode Q3, and the one end R4 is connected with the collector of triode Q1, the other end with
The base stage of triode Q3 is connected, the emitter grounding of triode Q3, and the collector of triode Q3 is exported by open-collector structure
Be switched on enable signal.
Discharge circuit: being made of resistance R5 and MOSFET Q2, and one end of resistance R5 is connected to the collector of triode Q1,
The other end is connected to the grid of metal-oxide-semiconductor Q2, and the drain electrode of metal-oxide-semiconductor Q2 is connected to VCC2, the source electrode ground connection of metal-oxide-semiconductor Q2.
Circuit operation principle:
When system electrification, power supply VCC1 charges to capacitor C1, triode Q1 because | Vbe | be less than 0.7V and by cannot
Trigger signal is generated, so that triode Q3, metal-oxide-semiconductor Q2 be made to close.When system is powered down, because power supply VCC2 power down, leads to three poles
Pipe Q1 | Vbe | it is connected greater than 0.7V, to generate high trigger signal, promotes metal-oxide-semiconductor Q2 to be connected, be rapidly completed to power supply
The electric discharge of VCC2, while be also connected triode Q3, triode Q3 collector potential is pulled down to close to 0V, to make front end
Power supply chip cannot normally start, only to be discharged normally to start after the completion even if powering on can not normally start fastly again,
Realize the effect of negative-feedback.
The realization of highly sensitive characteristic:
This circuit constitutes bleeder circuit by resistance R1 and R3, and gives capacitor C1 energy storage by diode D1, C1 energy storage
Voltage value can be adjusted by divider resistance, and the purpose for designing this bleeder circuit is to improve triode Q1 emitter
Bias voltage, makes it higher than the voltage of triode Q1 base stage, and difference is that (△ 1 can be set to 0-0.7V to △ 1, according to VCC2
The wave characteristic of power supply is set), transistor base voltage fall is △ 2 when power-off, as long as △ 1+ △ 2=0.7V, three poles
Pipe Q1 is immediately connected, and generates effective trigger signal, triggering late-class circuit work.△ 2=0.7- △ 1, the value of △ 2 is just lowered
0.7V is arrived hereinafter, the value of △ 2 is exactly to be discharged the drop-out voltage value of power supply VCC2, drop-out voltage value is far smaller than the prior art
The 1V power down amplitude of scheme, to improve the response sensitivity of circuit, and sensitivity can be matched according to circuit characteristic and be adjusted
Section, △ 1 is bigger, and sensitivity is higher.
The realization of 100% safety coefficient:
Because power supply VCC2 is the rear level power supply of power supply VCC1, VCC2 is inevitable prior to VCC1 power down, along with electric discharge
The power down speed of the repid discharge of circuit, power supply VCC2 is necessarily far longer than the power down speed of capacitor C1, to ensure that in electricity
Hold before C1 power down completes, VCC2 is centainly completely discharged that (capacitance of capacitor C1 need to be special according to the power down of power supply VCC1, power supply VCC2
Property carrys out Rational choice).Capacitor C1 can generate always stable high trigger signal during discharging, and be produced by negative-feedback circuit
Raw booting enable signal, effectively controls the delayed startup of front end power supply chip, after only the electricity to capacitor C1 discharges, power supply core
Piece could work normally, thus normal activation system.Even if the speed therefore re-powered after power down again also can by block, the circuit
The thorough electric discharge for realizing power supply VCC2, guarantees that back-end circuit is pulled low reset, the normal starting of safeguards system, to realize
100% safety coefficient.
Those skilled in the art do not depart from essence and spirit of the invention, can there are many deformation scheme realize the present invention,
The foregoing is merely preferably feasible embodiments of the invention, and not thereby limiting the scope of the invention, all with this
The variation of equivalent structure made by description of the invention and accompanying drawing content, is intended to be included within the scope of the present invention.
Claims (1)
1. a kind of highly sensitive quick discharging circuit, it is characterised in that: including sampling hold circuit module, trigger circuit module, anti-
Current feed circuit module and discharge circuit module, the sampling hold circuit module respectively with the trigger circuit module, the feedback
Circuit module is connected with the discharge circuit module, acquisition and deposit of the sampling hold circuit module for realizing energy,
When the trigger circuit module generates effective trigger signal, certain energy is provided and drives the feed circuit module and institute
State discharge circuit module work；The trigger circuit module for generate trigger signal and be sent to the feed circuit module and
The discharge circuit module；The feed circuit module is used to generate after the completion of discharge circuit module electric discharge and effectively open
Machine enable signal；The discharge circuit module is used for repid discharge；The feed circuit module is also used in the discharge circuit
Front end power supply chip is forbidden normally to start during module discharge；
The sampling hold circuit module includes resistance R1, resistance R3, capacitor C1, diode D1, and the one end resistance R1 is connected to electricity
Source VCC1, one end are connected to the anode of resistance R3 and diode D1, the other end ground connection of resistance R3, the cathode and electricity of diode D1
One end copolar for holding C1 connects the trigger circuit module, the other end ground connection of capacitor C1；
The trigger circuit module includes resistance R2, capacitor C2, triode Q1, and the one end resistance R2 connects power supply VCC2, resistance R2
The other end connects one end of capacitor C2 and the base stage of triode Q1, the other end ground connection of capacitor C2, and the emitter of triode Q1 connects
The sampling hold circuit module is connect, the collector of triode Q1 connects the feed circuit module and the discharge circuit mould
Block；
The feed circuit module includes resistance R4 and triode Q3, and the one end resistance R4 connects the trigger circuit module, resistance
The R4 other end is connected with the base stage of triode Q3, the emitter ground connection of triode Q3, and the collector output booting of triode Q3 makes
It can signal；
The discharge circuit module includes resistance R5 and field-effect tube Q2, and one end of resistance R5 connects the trigger circuit module,
The grid of the other end connection field-effect tube Q2 of resistance R5, the drain electrode of field-effect tube Q2 connect power supply VCC2, field-effect tube Q2's
Source electrode ground connection；
The emitter of one end copolar connecting triode Q1 of the cathode and capacitor C1 of diode D1；
The copolar end of the collector connection resistance R4 and resistance R5 of triode Q1；
When system is powered down, the triode Q1 exports same signal and drives the discharge circuit module electric discharge, drives described anti-
Current feed circuit module forbids front end power supply chip normally to start；
The power supply VCC2 is to be discharged power supply, and the power supply VCC2 is converted by power supply VCC1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810343246.7A CN108494239B (en) | 2018-04-17 | 2018-04-17 | A kind of highly sensitive quick discharging circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810343246.7A CN108494239B (en) | 2018-04-17 | 2018-04-17 | A kind of highly sensitive quick discharging circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108494239A CN108494239A (en) | 2018-09-04 |
| CN108494239B true CN108494239B (en) | 2019-11-22 |
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ID=63316294
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810343246.7A Active CN108494239B (en) | 2018-04-17 | 2018-04-17 | A kind of highly sensitive quick discharging circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN108494239B (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100539417C (en) * | 2006-03-26 | 2009-09-09 | 炬力集成电路设计有限公司 | Electrify restoration circuit |
| CN103389405A (en) * | 2012-05-11 | 2013-11-13 | 鸿富锦精密工业(武汉)有限公司 | Discharging detection circuit |
| CN204272066U (en) * | 2014-12-31 | 2015-04-15 | 深圳长城开发科技股份有限公司 | For automatic boot circuit and the meter-copy collector of wireless communication module |
| CN106301332B (en) * | 2015-05-19 | 2020-10-13 | 中兴通讯股份有限公司 | Circuit for discharging slow-start power supply loop |
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2018
- 2018-04-17 CN CN201810343246.7A patent/CN108494239B/en active Active
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| Publication number | Publication date |
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| CN108494239A (en) | 2018-09-04 |
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