CN109782565A - Current mirror laser projection circuit and laser projection clock - Google Patents
Current mirror laser projection circuit and laser projection clock Download PDFInfo
- Publication number
- CN109782565A CN109782565A CN201811650316.XA CN201811650316A CN109782565A CN 109782565 A CN109782565 A CN 109782565A CN 201811650316 A CN201811650316 A CN 201811650316A CN 109782565 A CN109782565 A CN 109782565A
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- triode
- circuit
- laser projection
- resistance
- laser
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Abstract
The invention discloses a kind of current mirror laser projection circuits, including first laser diode, second laser diode, the first triode, the second triode, first resistor and second resistance；The base stage of first triode is connected with the base stage of the second triode, the collector of first triode and the anode connection constant-current supply input terminal of first laser diode, the cathode of first laser diode connects the base stage common end of two triodes and the collector of the second triode, one end of the emitter connection first resistor of first triode, one end of the emitter connection second resistance of second triode, the common end of first resistor and second resistance is connect with the anode of second laser diode, the cathode ground connection of second laser diode.The present invention can be managed the electric current for flowing through two laser projection diodes, be consistent the laser pointer brightness of different length.
Description
Technical field
The present invention relates to a kind of current mirror laser projection circuit and laser projection clocks.
Background technique
Wall clock is a kind of daily necessity that can indicate information on user's time.Currently, wall clock is quite universal, it is
A kind of common product, although shape can be ever-changing, for some single wall clock, size be it is fixed,
It can not change, laser projection clock can solve above-mentioned technological deficiency.Laser projection clock at least needs two laser projection diodes,
It needs to be managed the electric current for flowing through two laser projection diodes.
Summary of the invention
The present invention proposes a kind of current mirror laser projection circuit and laser projection clock, can be to flowing through two laser projections two
The electric current of pole pipe is managed, and is consistent the laser pointer brightness of different length.
The technical scheme of the present invention is realized as follows:
A kind of current mirror laser projection circuit, including first laser diode, second laser diode, the first triode,
Second triode, first resistor and second resistance；The base stage of first triode is connected with the base stage of the second triode, described
The collector of first triode and the anode connection constant-current supply input terminal of first laser diode, the first laser diode
Cathode connect the base stage common end of two triodes and the collector of the second triode, the emitter of first triode connects
One end of the first resistor is connect, the emitter of second triode connects one end of the second resistance, first electricity
The common end of resistance and second resistance is connect with the anode of the second laser diode, and the cathode of the second laser diode connects
Ground.
It preferably, further include photodiode, voltage stabilizing chip, 3rd resistor, the 4th resistance, first capacitor and the three or three pole
Pipe, the input terminal of the voltage stabilizing chip connect constant-current supply input terminal, and output end connects the third transistor through the 4th resistance
Source electrode, the grounded drain of the third transistor, the anode of the photodiode connects constant-current supply input terminal, and cathode connects
The grid of one termination third transistor of the grid of three triodes, the 3rd resistor and first capacitor, other end ground connection.
A kind of laser projection clock, including current mirror laser projection circuit further include motor, lithium battery, main control chip and outer
Portion's power supply, the external power supply are that the main control chip and current mirror laser projection circuit are powered, and the lithium battery is the electricity
Machine power supply, the external power supply and the lithium battery are all connected with the main control chip.
It preferably, further include voltage regulator circuit, constant-current drive circuit, anti-overshoot circuit, the external power supply is sequentially connected institute
State voltage regulator circuit, constant-current drive circuit, anti-overshoot circuit, the output end and the current mirror laser projection of the anti-overshoot circuit
Circuit connection.
Preferably, the anti-overshoot circuit includes capacitor, resistance and triode, and one end of the resistance connects three pole
The collector of pipe connects, and the other end is connect with the base stage of the triode, the base stage of one end of the capacitor and the triode
Connection, the other end are connect with the emitter of the triode.
The beneficial effects of the present invention are: the electric current for flowing through two laser projection diodes can be managed, be made not
Laser pointer brightness with length is consistent.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of circuit diagram of current mirror laser projection circuit one embodiment of the present invention；
Fig. 2 is a kind of circuit diagram of laser projection clock one embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
As shown in Figure 1, the invention proposes a kind of current mirror laser projection circuit, including first laser diode, second
Laser diode, the first triode, the second triode, first resistor and second resistance；The base stage of first triode and the two or three
The base stage of pole pipe connects, the collector of the first triode and the anode connection constant-current supply input terminal of first laser diode, the
The cathode of one laser diode connects the base stage common end of two triodes and the collector of the second triode, the first triode
Emitter connects one end of first resistor, one end of the emitter connection second resistance of the second triode, first resistor and second
The common end of resistance is connect with the anode of second laser diode, the cathode ground connection of second laser diode.
One wordline pointer length of first laser diode is shorter than a wordline pointer length length of second laser diode.
The invention also includes photodiode, voltage stabilizing chip, 3rd resistor, the 4th resistance, first capacitor and the three or three poles
Pipe, the input terminal of voltage stabilizing chip connect constant-current supply input terminal, and output end connects the source electrode of third transistor through the 4th resistance, the
The grounded drain of three triodes, the anode of photodiode connect constant-current supply input terminal, and cathode connects the grid of third transistor, the
The grid of one termination third transistor of three resistance and first capacitor, other end ground connection.The components such as photodiode are set, it can
To realize according to the laser brightness that extraneous brightness change adjusts first laser diode, second laser diode issues.
In Fig. 1, I+ refers to constant-current supply input terminal.
As shown in Fig. 2, the invention also provides a kind of laser projection clock, including current mirror laser projection circuit, further include
Motor, lithium battery, main control chip and external power supply, external power supply are that main control chip and current mirror laser projection circuit are powered, lithium
Battery is motor power supply, and external power supply and lithium battery are all connected with main control chip.
In laser projection clock disclosed by the invention, first laser diode, that is, LD1 projection laser is hour hands, second laser
Diode, that is, LD2 projection laser is set as minute hand, and the laser pointer length of hour hands is shorter than the laser pointer length of minute hand, if providing
Identical electric current will lead to laser brightness of the laser brightness than minute hand of hour hands, and current mirror is arranged in the present invention, to the electric current of hour hands
It shunting, the electric current of shunting and the electric current of LD1 summarize into LD2, so that the laser brightness of minute hand improves, the electric current ratio specifically shunted
Example should be related with the ratio of hour hands and minute hand pointer length.
The invention also includes voltage regulator circuit, constant-current drive circuit, anti-overshoot circuit, external power supply is sequentially connected pressure stabilizing electricity
Road, constant-current drive circuit, anti-overshoot circuit, the output end and current mirror laser projection circuit connection of anti-overshoot circuit.
Anti- overshoot circuit includes capacitor, resistance and triode, and the collector connection of one end connecting triode of resistance is another
End is connect with the base stage of triode, and one end of capacitor and the base stage of triode connect, and the emitter of the other end and triode connects.
Specifically, circuit diagram shown in Fig. 2 is located on a main circuit board abbreviation mainboard, circuit diagram shown in FIG. 1 is located at one
On secondary circuit board abbreviation subplate, the sign flag of Fig. 1 and the duplicate electronic component of Fig. 2 is carried out using mainboard and subplate as prefix
It distinguishes.I+, I- connection in P2 and Fig. 1 in Fig. 2, circuit shown in Fig. 2 provide constant current for circuit shown in Fig. 1.
The present invention can be managed the electric current for flowing through two laser projection diodes, make the laser pointer of different length
Brightness is consistent.
Above-mentioned technical proposal discloses improvement of the invention, the technology contents not being disclosed in detail, can be by art technology
Personnel are achieved by the prior art.
The above is merely preferred embodiments of the present invention, be not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (5)
1. a kind of current mirror laser projection circuit, it is characterised in that: including first laser diode, second laser diode,
One triode, the second triode, first resistor and second resistance；The base stage of first triode and the base stage of the second triode
Connection, the collector of first triode and the anode connection constant-current supply input terminal of first laser diode, described first
The cathode of laser diode connects the base stage common end of two triodes and the collector of the second triode, first triode
Emitter connect one end of the first resistor, the emitter of second triode connects one end of the second resistance,
The common end of the first resistor and second resistance is connect with the anode of the second laser diode, two pole of second laser
The cathode of pipe is grounded.
2. current mirror laser projection circuit according to claim 1, it is characterised in that: further include photodiode, pressure stabilizing
The input terminal of chip, 3rd resistor, the 4th resistance, first capacitor and third transistor, the voltage stabilizing chip connects constant-current supply
Input terminal, output end connect the source electrode of the third transistor through the 4th resistance, and the grounded drain of the third transistor is described
The anode of photodiode connects constant-current supply input terminal, and cathode connects the grid of third transistor, the 3rd resistor and the first electricity
The grid for the termination third transistor held, other end ground connection.
3. a kind of laser projection clock, it is characterised in that: including current mirror laser projection circuit of any of claims 1 or 2, also wrap
Motor, lithium battery, main control chip and external power supply are included, the external power supply is the main control chip and current mirror laser projection electricity
Road power supply, the lithium battery are motor power supply, and the external power supply and the lithium battery are all connected with the main control chip.
4. laser projection clock according to claim 3, it is characterised in that: further include voltage regulator circuit, constant-current drive circuit, prevent
Circuit is overshooted, the external power supply is sequentially connected the voltage regulator circuit, constant-current drive circuit, anti-overshoot circuit, the anti-overshoot
The output end of circuit and the current mirror laser projection circuit connection.
5. laser projection clock according to claim 4, it is characterised in that: the anti-overshoot circuit include capacitor, resistance and
Triode, one end of the resistance connect the collector connection of the triode, and the other end is connect with the base stage of the triode,
One end of the capacitor is connect with the base stage of the triode, and the other end is connect with the emitter of the triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811650316.XA CN109782565A (en) | 2018-12-31 | 2018-12-31 | Current mirror laser projection circuit and laser projection clock |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811650316.XA CN109782565A (en) | 2018-12-31 | 2018-12-31 | Current mirror laser projection circuit and laser projection clock |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109782565A true CN109782565A (en) | 2019-05-21 |
Family
ID=66499749
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811650316.XA Pending CN109782565A (en) | 2018-12-31 | 2018-12-31 | Current mirror laser projection circuit and laser projection clock |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109782565A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2103154U (en) * | 1991-11-05 | 1992-04-29 | 赵新 | Luminous quartz clock |
| US20030206494A1 (en) * | 2001-05-16 | 2003-11-06 | Haupt Rolf Wilhelm | Projection alarm clock |
| CN101963780A (en) * | 2010-05-05 | 2011-02-02 | 南通芯迎设计服务有限公司 | Ray indicating clock |
| CN101976040A (en) * | 2010-10-13 | 2011-02-16 | 苏卿臣 | LED beam analog clock |
| CN102411903A (en) * | 2010-09-25 | 2012-04-11 | 力林科技股份有限公司 | Light emitting diode (LED) driving device |
| CN103561527A (en) * | 2013-11-19 | 2014-02-05 | 神龙汽车有限公司 | Dual-function LED drive circuit |
| CN204242566U (en) * | 2014-12-01 | 2015-04-01 | 钜汉显示技术(深圳)有限公司 | A kind of can Intelligent Dynamic adjustment screen backlight LCDs |
-
2018
- 2018-12-31 CN CN201811650316.XA patent/CN109782565A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2103154U (en) * | 1991-11-05 | 1992-04-29 | 赵新 | Luminous quartz clock |
| US20030206494A1 (en) * | 2001-05-16 | 2003-11-06 | Haupt Rolf Wilhelm | Projection alarm clock |
| CN101963780A (en) * | 2010-05-05 | 2011-02-02 | 南通芯迎设计服务有限公司 | Ray indicating clock |
| CN102411903A (en) * | 2010-09-25 | 2012-04-11 | 力林科技股份有限公司 | Light emitting diode (LED) driving device |
| CN101976040A (en) * | 2010-10-13 | 2011-02-16 | 苏卿臣 | LED beam analog clock |
| CN103561527A (en) * | 2013-11-19 | 2014-02-05 | 神龙汽车有限公司 | Dual-function LED drive circuit |
| CN204242566U (en) * | 2014-12-01 | 2015-04-01 | 钜汉显示技术(深圳)有限公司 | A kind of can Intelligent Dynamic adjustment screen backlight LCDs |
Non-Patent Citations (1)
| Title |
|---|
| 江路明: "《模拟电子技术基础》", 31 August 2008 * |
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Application publication date: 20190521 |