CN108968826A - A kind of small-power constant-current circuit applied to sweeping robot control circuit board - Google Patents
A kind of small-power constant-current circuit applied to sweeping robot control circuit board Download PDFInfo
- Publication number
- CN108968826A CN108968826A CN201810958741.9A CN201810958741A CN108968826A CN 108968826 A CN108968826 A CN 108968826A CN 201810958741 A CN201810958741 A CN 201810958741A CN 108968826 A CN108968826 A CN 108968826A
- Authority
- CN
- China
- Prior art keywords
- triode
- npn triode
- resistance
- pnp
- collector
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L11/00—Machines for cleaning floors, carpets, furniture, walls, or wall coverings
- A47L11/24—Floor-sweeping machines, motor-driven
-
- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
- A47L11/00—Machines for cleaning floors, carpets, furniture, walls, or wall coverings
- A47L11/40—Parts or details of machines not provided for in groups A47L11/02 - A47L11/38, or not restricted to one of these groups, e.g. handles, arrangements of switches, skirts, buffers, levers
- A47L11/4002—Installations of electric equipment
Abstract
The present invention provides a kind of small-power constant-current circuit applied to sweeping robot control circuit board, LED lamp circuit, NPN triode Q26, NPN triode Q27, PNP triode Q25 and the pwm signal connecting pin being connected with the base stage of PNP triode Q25 including being sequentially connected in series multiple LED light；The collector of the NPN triode Q26 is connected with one end of LED lamp circuit, is connected with capacitor C109 between the collector and base stage of NPN triode Q26；And the collector of NPN triode Q26 is also connected with a capacitor C108 and is followed by publicly；A resistance R149 is connected between the emitter of the NPN triode Q26 and the base stage of NPN triode Q27, and the emitter of NPN triode Q26 be also connected with a resistance R150 after access publicly, by controlling each NPN triode Q26, NPN triode Q27, PNP triode Q25 and connection type with PNP triode Q25, in actual application, it can preferably guarantee the consistency of the transmission power of each lamp.
Description
[technical field]
The present invention relates to small-power constant-current circuit technical field, more particularly to it is a kind of it is at low cost, performance is stable is applied to
The small-power constant-current circuit of sweeping robot control circuit board.
[background technique]
In recent years, sweeping robot product had obtained quick popularization and application, not only in configuration aspects or specific
There is significantly skill upgrading in terms of function, since automatically cleaning collection can be carried out to sundries within doors, and has one
Fixed intelligent level, so the prospect of the application of sweeping robot is very prominent.
The internal circuitry of sweeping robot is more part and parcel in actual application, such as in some batteries
In the system of power supply, it is desirable that operating current will not change with cell voltage, such as the infrared transmitting tube powered with cell voltage, just
Guarantee that transmission power will not change with the variation of cell voltage, the signal difference exceptional talents received in this way are small, in low current
In, how constant-current source circuit cost can be just effectively reduced, it is ensured that performance is stablized, and is that those skilled in the art often consider
The problem of, a large amount of research and development and experiment are also carried out, and achieve preferable achievement.
[summary of the invention]
To overcome the problems of prior art, the present invention provide a kind of at low cost, performance it is stable be applied to sweep the floor
The small-power constant-current circuit of robot control circuit plate.
The scheme that the present invention solves technical problem is to provide a kind of small-power applied to sweeping robot control circuit board
Constant-current circuit, LED lamp circuit, NPN triode Q26, NPN triode Q27, PNP including being sequentially connected in series multiple LED light
Triode Q25 and the pwm signal connecting pin being connected with the base stage of PNP triode Q25；The current collection of the NPN triode Q26
Pole is connected with one end of LED lamp circuit, is connected with capacitor C109 between the collector and base stage of NPN triode Q26；And it should
The collector of NPN triode Q26 is also connected with a capacitor C108 and is followed by publicly；The emitter and NPN of the NPN triode Q26
A resistance R149 is connected between the base stage of triode Q27, and after the emitter of NPN triode Q26 is also connected with a resistance R150
Access is publicly；The base stage of the NPN triode Q26 is connected with NPN triode Q27 collector；The PNP triode Q25
Collector and NPN triode Q27 collector between be connected with a resistance R146, and the collector of PNP triode Q25 is also
It is accessed publicly after connecting a resistance R148；The base stage of the PNP triode Q25 connects after connecting a resistance R144 with pwm signal
End is connect to be connected；Resistance R143 is also connected between the emitter and base stage of PNP triode Q25；And PNP triode Q25
Emitter is also connected with power connector end VCC_5V；The emitter of the PNP triode Q25 connects after being connected with the one end resistance R143
A capacitor C95 is met, and is accessed publicly.
Preferably, the NPN triode Q27 is accessed publicly after being connected with resistance R148, the one end resistance R150.
Compared with prior art, a kind of small-power constant-current circuit applied to sweeping robot control circuit board of the present invention is logical
It crosses and controls each NPN triode Q26, NPN triode Q27, PNP triode Q25 and the connection type with PNP triode Q25, it is real
In the application process of border, it can preferably guarantee the consistency of the transmission power of each lamp.
[Detailed description of the invention]
Fig. 1 is a kind of small-power constant-current circuit schematic diagram applied to sweeping robot control circuit board of the present invention.
[specific embodiment]
To make the purpose of the present invention, technical solution and advantage are more clearly understood, with reference to the accompanying drawings and embodiments, to this
Invention is further elaborated.It should be appreciated that specific embodiment described herein is used only for explaining the present invention, not
For limiting the invention.
Referring to Fig. 1, a kind of small-power constant-current circuit 1 applied to sweeping robot control circuit board of the present invention include according to
The secondary LED lamp circuit for being connected in series with multiple LED light, NPN triode Q26, NPN triode Q27, PNP triode Q25 and with
The pwm signal connecting pin that the base stage of PNP triode Q25 is connected；The collector of the NPN triode Q26 and LED lamp circuit
One end is connected, and is connected with capacitor C109 between the collector and base stage of NPN triode Q26；And NPN triode Q26
Collector is also connected with a capacitor C108 and is followed by publicly；The emitter of the NPN triode Q26 and the base stage of NPN triode Q27
Between connect a resistance R149, and the emitter of NPN triode Q26 be also connected with a resistance R150 after access publicly；It is described
The base stage of NPN triode Q26 is connected with NPN triode Q27 collector；The collector and NPN tri- of the PNP triode Q25
A resistance R146 is connected between the collector of pole pipe Q27, and the collector of PNP triode Q25 is also connected with a resistance R148
After access publicly；The base stage of the PNP triode Q25 is connected after connecting a resistance R144 with pwm signal connecting pin；It should
Resistance R143 is also connected between the emitter and base stage of PNP triode Q25；And the emitter of PNP triode Q25 is also connected with electricity
Source connection VCC_5V；The emitter of the PNP triode Q25 connects a capacitor C95 after being connected with the one end resistance R143, and
Access is publicly.
Preferably, the NPN triode Q27 is accessed publicly after being connected with resistance R148, the one end resistance R150.
When pwm signal is low, PNP triode Q25 conducting, VCC_5V makes NPN triode Q26, NPN after resistance R146
Triode Q27 conducting；After NPN triode Q27 conducting, the voltage (Q26Ve) of this point of IR_HL_TP1 is just limited to 0.6V；It flows through
Electric current=Ve/Re=0.6V/3.9R=153.8mA of Q26, as long as the variation of VBATT is being greater than n*VF, (n is the number of lamp, VF
For the forward conduction voltage of lamp) in range, flow through the electric current of NPN triode Q26 be exactly it is constant, this ensure that each lamp
The consistency of transmission power.
That connect by the emitter of PNP triode Q25 is 5V, but PWM output is that (main control chip PWM PIN is 3.3V level
The PIN of compatible 5V input), if pressure difference Vbe=of the control terminal by this PWM as output PIN, between high level ability 3.3V, Q25BE
(Vcc_5V-Vpwm) * R143/ (R143+R144)=(5-3.3) * 10/ (10+1)=1.54V is consistently greater than 0.7V, and Q25 is always
Conducting, can not achieve the function of closing constant-current source, but can handle by software, when wanting to close constant-current source, by PWM
Signal PIN is arranged to input PIN.PNP triode Q25BE in this way is not turned on without pressure difference, PNP triode Q25, reaches closing constant current
Line function.
It can also be by parameter of optimizing hardware, to realize unlatching, close constant-current source function.Vbe=(Vcc_5V-Vpwm) *
R143/ (R143+R144)=(5-3.3) * 2/ (10+2)=0.28V, pressure difference are less than the conducting voltage of PNP triode Q25；PNP
Triode Q25 is not turned on, and reaches the function of closing constant-current source, in this way after change parameter, simplifies software setting, PWM is only arranged
PIN is that the function of closing or opening constant-current source route can be realized in the high or low function of output.
Compared with prior art, a kind of small-power constant-current circuit 1 applied to sweeping robot control circuit board of the present invention
By controlling each NPN triode Q26, NPN triode Q27, PNP triode Q25 and connection type with PNP triode Q25,
In actual application, it can preferably guarantee the consistency of the transmission power of each lamp.
The embodiments of the present invention described above are not intended to limit the scope of the present invention.It is any in the present invention
Spirit and principle within made modifications, equivalent substitutions and improvements etc., should be included in claim protection model of the invention
Within enclosing.
Claims (2)
1. a kind of small-power constant-current circuit applied to sweeping robot control circuit board, it is characterised in that: including being sequentially connected in series
Be connected with the LED lamp circuits of multiple LED light, NPN triode Q26, NPN triode Q27, PNP triode Q25 and with PNP tri-
The pwm signal connecting pin that the base stage of pole pipe Q25 is connected；The collector of the NPN triode Q26 and one end of LED lamp circuit
It is connected, is connected with capacitor C109 between the collector and base stage of NPN triode Q26；And the current collection of NPN triode Q26
Pole is also connected with a capacitor C108 and is followed by publicly；Between the emitter of the NPN triode Q26 and the base stage of NPN triode Q27
Connect a resistance R149, and the emitter of NPN triode Q26 be also connected with a resistance R150 after access publicly；The NPN tri-
The base stage of pole pipe Q26 is connected with NPN triode Q27 collector；The collector and NPN triode of the PNP triode Q25
A resistance R146 is connected between the collector of Q27, and the collector of PNP triode Q25 is also connected with a resistance R148 and is followed by
Enter publicly；The base stage of the PNP triode Q25 is connected after connecting a resistance R144 with pwm signal connecting pin；The PNP tri-
Resistance R143 is also connected between the emitter and base stage of pole pipe Q25；And the emitter of PNP triode Q25 is also connected with power supply company
Meet end VCC_5V；The emitter of the PNP triode Q25 connects a capacitor C95 after being connected with the one end resistance R143, and accesses
Publicly.
2. a kind of small-power constant-current circuit applied to sweeping robot control circuit board as described in claim 1, feature
Be: the NPN triode Q27 is accessed publicly after being connected with resistance R148, the one end resistance R150.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810958741.9A CN108968826A (en) | 2018-08-22 | 2018-08-22 | A kind of small-power constant-current circuit applied to sweeping robot control circuit board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810958741.9A CN108968826A (en) | 2018-08-22 | 2018-08-22 | A kind of small-power constant-current circuit applied to sweeping robot control circuit board |
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| Publication Number | Publication Date |
|---|---|
| CN108968826A true CN108968826A (en) | 2018-12-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810958741.9A Pending CN108968826A (en) | 2018-08-22 | 2018-08-22 | A kind of small-power constant-current circuit applied to sweeping robot control circuit board |
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| CN (1) | CN108968826A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101646290A (en) * | 2008-08-06 | 2010-02-10 | 夏普株式会社 | Led drive circuit |
| CN202059637U (en) * | 2011-05-12 | 2011-11-30 | 邹杰 | LED constant current and high temperature current-limiting drive circuit using crystal triode |
| CN202385341U (en) * | 2011-11-28 | 2012-08-15 | 常州市巨泰电子有限公司 | LED power supply constant-current device |
| CN205353647U (en) * | 2016-02-26 | 2016-06-29 | 漳州科能电器有限公司 | Low -power consumption button awakening circuit |
| CN107508584A (en) * | 2017-08-28 | 2017-12-22 | 宁波瑞能智慧科技有限公司 | A kind of control circuit for DC fan heating |
-
2018
- 2018-08-22 CN CN201810958741.9A patent/CN108968826A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101646290A (en) * | 2008-08-06 | 2010-02-10 | 夏普株式会社 | Led drive circuit |
| CN202059637U (en) * | 2011-05-12 | 2011-11-30 | 邹杰 | LED constant current and high temperature current-limiting drive circuit using crystal triode |
| CN202385341U (en) * | 2011-11-28 | 2012-08-15 | 常州市巨泰电子有限公司 | LED power supply constant-current device |
| CN205353647U (en) * | 2016-02-26 | 2016-06-29 | 漳州科能电器有限公司 | Low -power consumption button awakening circuit |
| CN107508584A (en) * | 2017-08-28 | 2017-12-22 | 宁波瑞能智慧科技有限公司 | A kind of control circuit for DC fan heating |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181211 |
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| RJ01 | Rejection of invention patent application after publication |