CN209517566U - A kind of capacitor quick discharging circuit - Google Patents
A kind of capacitor quick discharging circuit Download PDFInfo
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- CN209517566U CN209517566U CN201821714197.5U CN201821714197U CN209517566U CN 209517566 U CN209517566 U CN 209517566U CN 201821714197 U CN201821714197 U CN 201821714197U CN 209517566 U CN209517566 U CN 209517566U
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Abstract
The utility model discloses a kind of capacitor quick discharging circuits, including LED driver, LED driver connects rectifier bridge BD1, rectifier bridge BD1 is electrically connected with exchange, and rectifier bridge BD1 is also connect with divider resistance, optocoupler U1 connection divider resistance, optocoupler U1 is also connect with triode Q1, triode Q1 is also connect with resistance R1, resistance R2 and capacitor C2 respectively, and resistance R1, resistance R2 and capacitor C2 are connect with LED driver respectively, and capacitor C1 and light source led are connect with LED driver respectively.The utility model controls the on and off of optocoupler U1 by input AC electricity, and then controls the on and off of resistance R1, and resistance R1 is not turned on when input voltage is normal, when disconnecting input voltage, connects resistance R1 immediately and discharges capacitor C1；Compared to the load resistance that traditional mode eliminates constant conduction, the quiescent dissipation of power supply is reduced.
Description
Technical field
The utility model belongs to optocoupler and triode control technology field, and in particular to a kind of capacitor quick discharging circuit.
Background technique
Intelligent lamp on the market has a function of a hardware reset at present, method be by be continuously powered and power off come
Realize, and some desk lamps with dimmer switch because the capacitance of output capacitance taken the reason of to consider output current ripple it is very big, thus
Will cause our LED light when low-light level carries out power-down actions can also continue bright some time, in order to solve the problems, such as this, mesh
Preceding technology has the disadvantage that 1, by output capacitance both ends shunt load resistance；2, require client high brightness when
It waits and carries out homing action.
Utility model content
The purpose of this utility model is to provide a kind of capacitor quick discharging circuits, to solve to propose in above-mentioned background technique
The problem of.A kind of capacitor quick discharging circuit provided by the utility model has the load resistance for eliminating constant conduction, reduces
The characteristics of quiescent dissipation of power supply.
To achieve the above object, the utility model provides the following technical solutions: a kind of capacitor quick discharging circuit, including
LED driver, LED driver connect rectifier bridge BD1, rectifier bridge BD1 with exchange be electrically connected, rectifier bridge BD1 also with divider resistance
Connection, optocoupler U1 connection divider resistance, optocoupler U1 also connect with triode Q1, triode Q1 also respectively with resistance R1, resistance R2
Connected with capacitor C2, resistance R1, resistance R2 and capacitor C2 are connect with LED driver respectively, capacitor C1 and light source led respectively with
LED driver connection.
In the present invention further, the input terminal of rectifier bridge BD1 connects alternating current, the output end of rectifier bridge BD1
It is separately connected LED driver and divider resistance, converts alternating current to pulse direct current.
In the present invention further, divider resistance includes resistance R3 and resistance R4, and resistance R3 connects with resistance R4,
So as to control the on or off of optocoupler U1.
In the present invention further, the input terminal of optocoupler U1 is connected in parallel on the both ends of resistance R4, the output of optocoupler U1
End is in parallel with the ground level of triode Q1 and emitting stage, thus to control the on or off of triode Q1.
In the present invention further, the ground level of resistance R2 and capacitor C2 connecting triode Q1, resistance R2's is another
End connection LED driver output cathode, the other end of capacitor C2 connects LED driver output negative pole, by resistance R2 to capacitor
C2 charges.
In the present invention further, the output cathode of one end connection LED driver of resistance R1, resistance R1's is another
The collector of one end connecting triode Q1 connects resistance R1 by triode Q1 to give capacitor C1 repid discharge.
In the present invention further, capacitor C1 is in parallel with the output end of LED driver.
In the present invention further, light source led is in parallel with the output end of LED driver, and light source led includes
LED1, LED2 and LED3, and LED1, LED2 and LED3 are sequentially connected in series.
In the present invention further, the implementation method of the capacitor quick discharging circuit, comprising the following steps:
(1), after rectifier bridge BD1 accesses alternating current, pulse direct current is exported；
(2), when divider resistance R4 both end voltage is greater than optocoupler U1 conducting voltage 0.7V, optocoupler U1 conducting；Work as partial pressure
Resistance R4 both end voltage is less than optocoupler U1 conducting voltage, and optocoupler U1 cut-off, is all that 311K is with resistance R3 and resistance R4 resistance value
Example will reach R4 both end voltage < 0.7V optocoupler cut-off, then resistance R4 power-up resistance R3 both end voltage < 1.4V, by calculating,
θ=0.2578
T=0.2578/90*5ms*2=28.6us
It is 28.6us that input voltage, which is obtained, less than the duration of optocoupler U1 conducting voltage；
(3), terminal shortcircuit is exported after optocoupler U1 conducting, triode Q1 cut-off, output end is opened a way after optocoupler U1 cut-off,
Time continues 28.6uS, and LED driver output cathode is charged by resistance R2 to capacitor C2 at this time, is with LED output voltage
60V, charging resistor R2 are that 100K passes through design for capacitor C2 is 100nF:
V0 is initial voltage value=0.2V on capacitor；
V1 is voltage value=60V that capacitor finally can be charged to or be put into；
Vt is voltage value=0.7V on t moment capacitor；
By: Vt=V0+ (V1-V0) * [1-exp (- t/RC)]
It obtains: t=RC*Ln [(V1-V0)/(V1-Vt)]
The above parameter is then substituted into following calculation formula:
It obtains: t=100000*0.0000001*Ln [(60-0.2)/(60-0.7)]=83.96us；
The time that capacitor C2 both end voltage charges to triode Q1 conducting voltage 0.7V is 83.96us, is much larger than 28.6us,
For namely optocoupler U1 within the time of the 28.6us of cut-off, triode Q1 is still within off state；
(4), when disconnecting input voltage, optocoupler U1 persistently ends, and LED driver output cathode is by resistance R2 to capacitor
C2 charging, by calculating above, after the charging time reaches 83.96us, capacitor C2 both end voltage is greater than optocoupler U1 electric conduction
0.7V, triode Q1 conducting are pressed, resistance R1 equivalent parallel carries out repid discharge at the both ends capacitor C1, to capacitor C1.
In the present invention further, the implementation method of the capacitor quick discharging circuit, rectifier bridge BD1's is defeated
Enter end connection alternating current, the output end of rectifier bridge BD1 is separately connected LED driver and divider resistance；Divider resistance includes resistance
R3 and resistance R4, resistance R3 connect with resistance R4；The input terminal of optocoupler U1 is connected in parallel on the both ends of resistance R4, the output of optocoupler U1
It holds in parallel with the ground level of triode Q1 and emitting stage；The ground level of resistance R2 and capacitor C2 connecting triode Q1, resistance R2's is another
End connection LED driver output cathode, the other end of capacitor C2 connect LED driver output negative pole；One end of resistance R1 connects
The output cathode of LED driver, the collector of the other end connecting triode Q1 of resistance R1；Capacitor C1 and LED driver it is defeated
Outlet is in parallel；Light source led is in parallel with the output end of LED driver, and light source led includes LED1, LED2 and LED3, and LED1,
LED2 and LED3 are sequentially connected in series.
Compared with prior art, the utility model has the beneficial effects that
1, the utility model controls the on and off of optocoupler U1 by input AC electricity, and then controls leading for resistance R1
Logical and cut-off, resistance R1 is not turned on when input voltage is normal, when disconnecting input voltage, is connected resistance R1 immediately and is carried out to capacitor C1
Electric discharge；
2, the utility model solves current power supply using large bulk capacitance and makes to meet better output ripple
With causing lamps and lanterns low-light level to turn off the light the contradiction of overlong time after large bulk capacitance；
3, the utility model eliminates the load resistance of constant conduction compared to traditional mode, reduces the static function of power supply
Consumption.
Detailed description of the invention
Fig. 1 is the circuit diagram of the utility model；
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
Embodiment
Referring to Fig. 1, the utility model is the following technical schemes are provided: a kind of capacitor quick discharging circuit, including LED drive
Device, LED driver connect rectifier bridge BD1, and rectifier bridge BD1 is electrically connected with exchange, and rectifier bridge BD1 is also connect with divider resistance, light
Coupling U1 connection divider resistance, optocoupler U1 are also connect with triode Q1, triode Q1 also respectively with resistance R1, resistance R2 and capacitor C2
Connection, resistance R1, resistance R2 and capacitor C2 are connect with LED driver respectively, and capacitor C1 and light source led drive with LED respectively
Device connection.
Further, the input terminal of rectifier bridge BD1 connects alternating current, and the output end of rectifier bridge BD1 is separately connected LED driving
Device and divider resistance.
Further, divider resistance includes resistance R3 and resistance R4, and resistance R3 connects with resistance R4.
Further, the input terminal of optocoupler U1 is connected in parallel on the both ends of resistance R4, and the output end of optocoupler U1 is with triode Q1's
Ground level and emitting stage are in parallel.
Further, the other end of the ground level of resistance R2 and capacitor C2 connecting triode Q1, resistance R2 connects LED driver
The other end of output cathode, capacitor C2 connects LED driver output negative pole.
Further, the output cathode of one end connection LED driver of resistance R1, the other end connecting triode of resistance R1
The collector of Q1.
Further, capacitor C1 is in parallel with the output end of LED driver.
Further, light source led is in parallel with the output end of LED driver, and light source led includes LED1, LED2 and LED3,
And LED1, LED2 and LED3 are sequentially connected in series.
Further, the implementation method of capacitor quick discharging circuit described in the utility model, comprising the following steps:
(1), rectifier bridge BD1 accesses 220V alternating current, exports 311V pulse direct current；
(2), the resistance value for selecting resistance R3 and resistance R4 is 311k Ω, when the input voltage at divider resistance both ends is greater than
When 1.4V, resistance R4 both end voltage is greater than 0.7V, optocoupler U1 conducting；When the input voltage at divider resistance both ends is less than 1.4V,
Resistance R4 both end voltage is less than 0.7V, and optocoupler U1 cut-off, by calculating, input voltage is less than 1.4V duration and is
28.6us, calculation formula are as follows:
θ=0.2578
T=0.2578/90*5ms*2=28.6us
(3), terminal shortcircuit is exported after optocoupler U1 conducting, voltage is equal to 0.2V, triode Q1 cut-off, the voltage of capacitor C2
Equal to 0.2V, output end is opened a way after optocoupler U1 cut-off, and LED driver output cathode is filled by resistance R2 to capacitor C2 at this time
Electricity is selected resistance R2=100K, capacitor C2=100nF in the present embodiment, is charged to by design capacitance C2 voltage by 0.2V
The time of 0.7V is 83.96us, is greater than 28.6us, then triode Q1 is still within off state, so in normal power supply situation
Under, triode Q1 is off state always, and resistance R2 is not turned on；
In the present embodiment by Vt=V0+ (V1-V0) * [1-exp (- t/RC)]
It obtains: t=RC*Ln [(V1-V0)/(V1-Vt)]
The above parameter is then substituted into following calculation formula:
It obtains: t=100000*0.0000001*Ln [(60-0.2)/(60-0.7)]=83.96us
Wherein, V0 is initial voltage value=0.2V on capacitor；
V1 is voltage value=60V that capacitor finally can be charged to or be put into；
Vt is voltage value=0.7V on t moment capacitor；
(4), when disconnecting input voltage, optocoupler U1 persistently ends, and LED driver output cathode is by resistance R2 to capacitor
C2 charging, by calculating above, after the charging time reaches 83.96us, capacitor C2 both end voltage is greater than optocoupler U1 electric conduction
When pressing 0.7V, triode Q1 conducting, resistance R1 equivalent parallel carries out repid discharge at the both ends capacitor C1, to capacitor C1.
Rectifier bridge BD1 is the MB10F model that Changzhou extensively reaches Electronics Co., Ltd.'s sale in the present embodiment；Resistance R1, resistance
R2, resistance R3 and resistance R4 are 1206 Chip-Rs of Foochow Milky Way producer sale, and wherein the resistance value of resistance R1 is 100
The resistance value of Ω, resistance R2 are that the resistance value of 100k Ω, resistance R3 and resistance R4 are 311k Ω；Optocoupler U1 is the sale of hundred million light
817 models；LED driver be must easily scientific and technological producer's sale KP114 model；Capacitor C1 is the sale of Hunan Aiwa producer
100V/68uF model；Capacitor C2 is the 100V/100nF model of producer, FENGHUA ADVANCED TECHNOLOGY sale；Triode Q1 is that Changzhou extensively reaches electricity
The BCP56 model of sub- producer, Co., Ltd sale；LED1, LED2 and LED3 are the 20V/100mA type of Mu Linsen producer sale
Number.
By above embodiments we it can be concluded that, by rectifier bridge BD1 export pulse direct current come control optocoupler U1 conducting
Or cut-off, so that it is controlled the on or off of triode Q1, after input voltage disconnects, triode Q1 connects resistance R1 and comes to electricity
Hold C1 repid discharge, to achieve the purpose that capacitor repid discharge.
While there has been shown and described that the embodiments of the present invention, for the ordinary skill in the art,
It is understood that these embodiments can be carried out with a variety of variations in the case where not departing from the principles of the present invention and spirit, repaired
Change, replacement and variant, the scope of the utility model is defined by the appended claims and the equivalents thereof.
Claims (8)
1. a kind of capacitor quick discharging circuit, including LED driver, it is characterised in that: LED driver connects rectifier bridge BD1, whole
Stream bridge BD1 is electrically connected with exchanging, and rectifier bridge BD1 is also connect with divider resistance, optocoupler U1 connection divider resistance, and optocoupler U1 is also with three
Pole pipe Q1 connection, triode Q1 are also connect with resistance R1, resistance R2 and capacitor C2 respectively, and resistance R1, resistance R2 and capacitor C2 points
It is not connect with LED driver, capacitor C1 and light source led are connect with LED driver respectively.
2. a kind of capacitor quick discharging circuit according to claim 1, it is characterised in that: the input terminal of rectifier bridge BD1 connects
Alternating current is connect, the output end of rectifier bridge BD1 is separately connected LED driver and divider resistance.
3. a kind of capacitor quick discharging circuit according to claim 2, it is characterised in that: divider resistance include resistance R3 and
Resistance R4, resistance R3 connect with resistance R4.
4. a kind of capacitor quick discharging circuit according to claim 3, it is characterised in that: the input terminal of optocoupler U1 is connected in parallel on
The output end at the both ends of resistance R4, optocoupler U1 is in parallel with the ground level of triode Q1 and emitting stage.
5. a kind of capacitor quick discharging circuit according to claim 1, it is characterised in that: resistance R2 connects three with capacitor C2
The ground level of pole pipe Q1, the other end of resistance R2 connect LED driver output cathode, and the other end of capacitor C2 connects LED driver
Output negative pole.
6. a kind of capacitor quick discharging circuit according to claim 1, it is characterised in that: one end of resistance R1 connects LED
The output cathode of driver, the collector of the other end connecting triode Q1 of resistance R1.
7. a kind of capacitor quick discharging circuit according to claim 1, it is characterised in that: capacitor C1 and LED driver
Output end is in parallel.
8. a kind of capacitor quick discharging circuit according to claim 1, it is characterised in that: light source led and LED driver
Output end is in parallel, and light source led includes LED1, LED2 and LED3, and LED1, LED2 and LED3 are sequentially connected in series.
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| CN201821714197.5U CN209517566U (en) | 2018-10-22 | 2018-10-22 | A kind of capacitor quick discharging circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821714197.5U CN209517566U (en) | 2018-10-22 | 2018-10-22 | A kind of capacitor quick discharging circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109327934A (en) * | 2018-10-22 | 2019-02-12 | 横店集团得邦照明股份有限公司 | A kind of capacitor quick discharging circuit and its implementation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109327934A (en) * | 2018-10-22 | 2019-02-12 | 横店集团得邦照明股份有限公司 | A kind of capacitor quick discharging circuit and its implementation |
| CN109327934B (en) * | 2018-10-22 | 2024-01-23 | 横店集团得邦照明股份有限公司 | Capacitor rapid discharging circuit and implementation method thereof |
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