CN102595683A - Driving circuit, driving device and equipment - Google Patents
Driving circuit, driving device and equipment Download PDFInfo
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- CN102595683A CN102595683A CN2011100092141A CN201110009214A CN102595683A CN 102595683 A CN102595683 A CN 102595683A CN 2011100092141 A CN2011100092141 A CN 2011100092141A CN 201110009214 A CN201110009214 A CN 201110009214A CN 102595683 A CN102595683 A CN 102595683A
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Abstract
The invention is applicable to the field of power supplies, and provides a driving circuit, a driving device and equipment. The driving circuit comprises a main driving chip, a metal-oxide-semiconductor (MOS) tube, a voltage stabilizing diode, an inductor and a constant current power. According to the embodiment of the invention, because the combination of the main driving chip and the constant current source AD is added in the driving circuit, the constant current precision is further improved based on the prior art, and the constant current precision is not affected when other loads or elements and devices are serially/parallelly connected in.
Description
Technical field
The invention belongs to field of power supplies, relate in particular to a kind of drive circuit, drive unit and equipment.
Background technology
The traditional driving circuit like led drive circuit etc., is to come controlling and driving switch (driving switchs of metal-oxide-semiconductor, triode or other types) through the mode that main chip for driving IC1 detects sampling resistor, thereby drive current is controlled at a certain scope fluctuation.
Fig. 1 is a kind of drive circuit based on this operation principle design; This circuit detects the voltage of sampling resistor R2 through main chip for driving IC1; And draw the current value of sampling resistor R2 at this moment thus, thus pass through the mode of controlling and driving switch, control is to the current value of load output.The concrete working condition of this circuit is, when main chip for driving IC1 detected voltage on the sampling resistor R2 and surpasses a certain threshold value, main chip for driving IC1 closed driving switch; When main chip for driving IC1 detects voltage on the sampling resistor R2 and is lower than a certain threshold value, main chip for driving IC1 conducting driving switch.The drive current of load is operated in frequent on off state, working current value one among a small circle in the fluctuation.
More specifically; When the load driving electric current is 350mA; Master's chip for driving IC1 confirms current value at this moment according to the voltage of detected sampling resistor during work, fluctuates thereby utilize closing of driving switch with conducting output current to be remained in certain scope.See and be that when electric current during greater than 350mA, main chip for driving IC1 control metal-oxide-semiconductor is closed from the electric current of output; When electric current during less than 350mA, the conducting of main chip for driving IC1 control metal-oxide-semiconductor.
The shortcoming of this type of drive is, when voltage changes, needs the mode through the adjustment switch, the relatively output of the adjustment voltage of " indirectly ", so the fluctuation range of electric current is bigger, current constant property is relatively poor.And after the regularization condition of chip is set, again serial connection or and when connecing other loads or components and parts, the error that these loads or components and parts bring also can influence constant current accuracy.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of drive circuit, is intended to improve the constancy of the output of electric current in the drive circuit, and can be because of not inserting other loads or components and parts, and influences constant current accuracy.
The embodiment of the invention is achieved in that
Main chip for driving IC;
Drain electrode is connected the metal-oxide-semiconductor Q that grid is connected with said main chip for driving IC with power input;
Negative pole is connected with the source electrode of said metal-oxide-semiconductor Q, the voltage stabilizing didoe D of plus earth;
The inductance L that is connected with the source electrode of said metal-oxide-semiconductor Q,
Said drive circuit also comprises constant-current source AD; First end of said constant-current source AD is connected with the output of load, the second end ground connection, and the 3rd end span is connected to the input of load; Be used for the current information that collects according to constant-current source AD; Restriction electric current or the 3rd end output current through said constant-current source AD, keeping the constant of load current, and the feedback pin of main chip for driving is connected with the input of load or said constant-current source AD.
Another purpose of the embodiment of the invention is to provide a kind of drive unit that comprises drive circuit, and said drive circuit comprises:
Main chip for driving IC;
Drain electrode is connected the metal-oxide-semiconductor Q that grid is connected with said main chip for driving IC with power input;
Negative pole is connected with the source electrode of said metal-oxide-semiconductor Q, the voltage stabilizing didoe D of plus earth;
The inductance L that is connected with the source electrode of said metal-oxide-semiconductor Q,
Said drive circuit also comprises constant-current source AD; First end of said constant-current source AD is connected with the output of load, the second end ground connection, and the 3rd end span is connected to the input of load; Be used for the current information that collects according to constant-current source AD; Restriction electric current or the 3rd end output current through said constant-current source AD, keeping the constant of load current, and the feedback pin of main chip for driving is connected with the input of load or said constant-current source AD.
Another purpose of the embodiment of the invention is to provide a kind of equipment that comprises drive circuit, and said drive circuit comprises:
Main chip for driving IC;
Drain electrode is connected the metal-oxide-semiconductor Q that grid is connected with said main chip for driving IC with power input;
Negative pole is connected with the source electrode of said metal-oxide-semiconductor Q, the voltage stabilizing didoe D of plus earth;
The inductance L that is connected with the source electrode of said metal-oxide-semiconductor Q,
Said drive circuit also comprises constant-current source AD; First end of said constant-current source AD is connected with the output of load, the second end ground connection, and the 3rd end span is connected to the input of load; Be used for the current information that collects according to constant-current source AD; Restriction electric current or the 3rd end output current through said constant-current source AD, keeping the constant of load current, and the feedback pin of main chip for driving is connected with the input of load or said constant-current source AD.
The embodiment of the invention is through adding the combination of becoming owner of chip for driving and constant-current source AD in drive circuit, at the existing technical further constant current accuracy that improved, and in serial connection/and insert under the situation of other loads or components and parts, constant current accuracy is not affected.
Description of drawings
Fig. 1 is the circuit structure diagram of existing drive circuit;
Fig. 2 is the circuit structure diagram of the drive circuit that provides of the embodiment of the invention.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
The embodiment of the invention is relatively poor to the constancy of current driver circuit electric current; And when being connected in series other loads or components and parts; To problems such as the constant current accuracy influence are big, make main chip for driving and constant-current source combine work, thereby realize improving constant current accuracy; And be connected in series/and insert under the situation of other loads or components and parts, constant current accuracy is not affected.
The embodiment of the invention is achieved in that
Main chip for driving IC;
Drain electrode is connected the metal-oxide-semiconductor Q that grid is connected with said main chip for driving IC with power input;
Negative pole is connected with the source electrode of said metal-oxide-semiconductor Q, the voltage stabilizing didoe D of plus earth;
The inductance L that is connected with the source electrode of said metal-oxide-semiconductor Q,
Said drive circuit also comprises constant-current source AD; First end of said constant-current source AD is connected with the output of load, the second end ground connection, and the 3rd end span is connected to the input of load; Be used for the current information that collects according to constant-current source AD; Restriction electric current or the 3rd end output current through said constant-current source AD, keeping the constant of load current, and the feedback pin of main chip for driving is connected with the input of load or said constant-current source AD.
Another purpose of the embodiment of the invention is to provide a kind of drive unit that comprises drive circuit, and said drive circuit comprises:
Main chip for driving IC;
Drain electrode is connected the metal-oxide-semiconductor Q that grid is connected with said main chip for driving IC with power input;
Negative pole is connected with the source electrode of said metal-oxide-semiconductor Q, the voltage stabilizing didoe D of plus earth;
The inductance L that is connected with the source electrode of said metal-oxide-semiconductor Q,
Said drive circuit also comprises constant-current source AD; First end of said constant-current source AD is connected with the output of load, the second end ground connection, and the 3rd end span is connected to the input of load; Be used for the current information that collects according to constant-current source AD; Restriction electric current or the 3rd end output current through said constant-current source AD, keeping the constant of load current, and the feedback pin of main chip for driving is connected with the input of load or said constant-current source AD.
Another purpose of the embodiment of the invention is to provide a kind of equipment that comprises drive circuit, and said drive circuit comprises:
Main chip for driving IC;
Drain electrode is connected the metal-oxide-semiconductor Q that grid is connected with said main chip for driving IC with power input;
Negative pole is connected with the source electrode of said metal-oxide-semiconductor Q, the voltage stabilizing didoe D of plus earth;
The inductance L that is connected with the source electrode of said metal-oxide-semiconductor Q,
Said drive circuit also comprises constant-current source AD; First end of said constant-current source AD is connected with the output of load, the second end ground connection, and the 3rd end span is connected to the input of load; Be used for the current information that collects according to constant-current source AD; Restriction electric current or the 3rd end output current through said constant-current source AD, keeping the constant of load current, and the feedback pin of main chip for driving is connected with the input of load or said constant-current source AD.
The embodiment of the invention is through adding the combination of becoming owner of chip for driving and constant-current source in drive circuit, at the existing technical further constant current accuracy that improved, and in serial connection/and insert under the situation of other loads or components and parts, constant current accuracy is not affected.
Embodiment one:
Fig. 1 shows the circuit structure of the drive circuit that first embodiment of the invention provides, and only shows the part relevant with the embodiment of the invention for the ease of explanation.
This drive circuit comprises:
Main chip for driving IC; The feedback pin 11 of main chip for driving IC is connected with the input of load or constant-current source AD; When having the situation of a plurality of loads in the circuit, the feedback pin 11 of main chip for driving IC can be connected with the input of any load, and this main chip for driving IC is used for according to the real-time Voltage Feedback of load place; The output correspondent voltage is to keep the constant of load voltage;
Drain electrode is connected the metal-oxide-semiconductor Q that grid is connected with main chip for driving IC with power input;
Negative pole is connected with the source electrode of metal-oxide-semiconductor Q, the voltage stabilizing didoe D of plus earth;
The inductance L that is connected with the source electrode of metal-oxide-semiconductor Q,
Also comprise constant-current source AD, first end of constant-current source AD is connected with the output of load, the second end ground connection; The 3rd end span is connected to the input of load; When having a plurality of load in the circuit, the 3rd end of constant-current source AD can cross-over connection in the input of arbitrary load, when a plurality of branch roads parallel connection; On each branch road, insert a constant-current source, the input that the 3rd end of constant-current source AD can cross-over connection arbitrary load of branch road under it.Constant-current source AD is according to the current information that collects, and the restriction electric current perhaps passes through the 3rd end output current of constant-current source AD, to keep the constant of load current.
In real work, main chip for driving IC is through the voltage at its feedback pin 11 feedback loads or constant-current source place.Voltage at load or constant-current source place is lower than or when being higher than normal value (or set point), main chip for driving through adjustment to load output correspondent voltage, to keep the stable of output voltage.Like this, the voltage of load place has stronger constancy, and by this method, drive circuit can adapt to load or other component numbers automatically, when other loads of serial connection and components and parts, still can guarantee constant current accuracy.As the example of the embodiment of the invention, load is the LED lamp, and the model of main chip for driving IC is CYT3155.
Constant-current source AD first end is connected with load, and the second end ground connection under the situation of multiple branch circuit parallel connection (like the parallel connection of multi-string LED even load), is all disposed a constant-current source AD at each branch road.The constant current value of this constant-current source AD can be fixed when producing, and also can carry out manual work through modes such as softwares and set in use according to the needs of reality.After having confirmed the constant current value of constant-current source AD, when the electric current of certain bar branch road during greater than constant current value, the constant-current source AD on this branch road suppresses the electric current of this branch road, to guarantee the constant of electric current according to the real-time sampled value of this branch road and the constant current value of setting; When the electric current of certain bar branch road during less than constant current value, the constant-current source AD on this branch road is according to the real-time sampled value of this branch road and the constant current value of setting, through its 3rd end to the circuit output current, to guarantee the constant of electric current.Like this, in case confirmed the current value of output, what each branch road that constant-current source AD arranged just can holding current is constant, when having load or other components and parts parallelly connected, also can not exert an influence to constant current accuracy.
The embodiment of the invention is through adding the combination of becoming owner of chip for driving and constant-current source in drive circuit, at the existing technical further constant current accuracy that improved, and in serial connection/and insert under the situation of other loads or components and parts, constant current accuracy is not affected.
Embodiment two:
The equipment that the drive circuit that the embodiment of the invention provides can be used for various drive units such as LED illumination, LED power supply, modularity driving and use these drive units.
The embodiment of the invention is through adding the combination of becoming owner of chip for driving and constant-current source in drive circuit, at the existing technical further constant current accuracy that improved, and in serial connection/and insert under the situation of other loads or components and parts, constant current accuracy is not affected.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. drive circuit comprises:
Main chip for driving IC;
Drain electrode is connected the metal-oxide-semiconductor Q that grid is connected with said main chip for driving IC with power input;
Negative pole is connected with the source electrode of said metal-oxide-semiconductor Q, the voltage stabilizing didoe D of plus earth;
The inductance L that is connected with the source electrode of said metal-oxide-semiconductor Q,
It is characterized in that,
Said drive circuit also comprises constant-current source AD; First end of said constant-current source AD is connected with the output of load, the second end ground connection, and the 3rd end span is connected to the input of load; Be used for the current information that collects according to constant-current source AD; Restriction electric current or the 3rd end output current through said constant-current source AD, keeping the constant of load current, and the feedback pin of main chip for driving is connected with the input of load or said constant-current source AD.
2. drive circuit as claimed in claim 1 is characterized in that, the constant current value of artificial setting when fixing constant current value perhaps used when the constant current value of said constant-current source AD was the production constant-current source.
3. drive unit that comprises drive circuit, said drive circuit comprises:
Main chip for driving IC;
Drain electrode is connected the metal-oxide-semiconductor Q that grid is connected with said main chip for driving IC with power input;
Negative pole is connected with the source electrode of said metal-oxide-semiconductor Q, the voltage stabilizing didoe D of plus earth;
The inductance L that is connected with the source electrode of said metal-oxide-semiconductor Q,
It is characterized in that,
Said drive circuit also comprises constant-current source AD; First end of said constant-current source AD is connected with the output of load, the second end ground connection, and the 3rd end span is connected to the input of load; Be used for the current information that collects according to constant-current source AD; Restriction electric current or the 3rd end output current through said constant-current source AD, keeping the constant of load current, and the feedback pin of main chip for driving is connected with the input of load or said constant-current source AD.
4. drive unit as claimed in claim 3 is characterized in that, the constant current value of artificial setting when fixing constant current value perhaps used when the constant current value of said constant-current source AD was the production constant-current source.
5. equipment that comprises drive circuit, said drive circuit comprises:
Main chip for driving IC;
Drain electrode is connected the metal-oxide-semiconductor Q that grid is connected with said main chip for driving IC with power input;
Negative pole is connected with the source electrode of said metal-oxide-semiconductor Q, the voltage stabilizing didoe D of plus earth;
The inductance L that is connected with the source electrode of said metal-oxide-semiconductor Q,
It is characterized in that,
Said drive circuit also comprises constant-current source AD; First end of said constant-current source AD is connected with the output of load, the second end ground connection, and the 3rd end span is connected to the input of load; Be used for the current information that collects according to constant-current source AD; Restriction electric current or the 3rd end output current through said constant-current source AD, keeping the constant of load current, and the feedback pin of main chip for driving is connected with the input of load or said constant-current source AD.
6. equipment as claimed in claim 5 is characterized in that, the constant current value of artificial setting when fixing constant current value perhaps used when the constant current value of said constant-current source AD was the production constant-current source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100092141A CN102595683A (en) | 2011-01-17 | 2011-01-17 | Driving circuit, driving device and equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100092141A CN102595683A (en) | 2011-01-17 | 2011-01-17 | Driving circuit, driving device and equipment |
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| CN102595683A true CN102595683A (en) | 2012-07-18 |
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| CN2011100092141A Pending CN102595683A (en) | 2011-01-17 | 2011-01-17 | Driving circuit, driving device and equipment |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1683818A (en) * | 2005-02-23 | 2005-10-19 | 石为民 | Portable self-aid type lighting device |
| CN201028439Y (en) * | 2007-01-12 | 2008-02-27 | 吴富昌 | Brightness-adjustable lamp bead |
| CN101478849A (en) * | 2009-01-22 | 2009-07-08 | 广州南科集成电子有限公司 | Energy saving control circuit for LED lamp |
| CN201708974U (en) * | 2010-05-28 | 2011-01-12 | 郑榕彬 | Non-electrolytic capacitors power factor self-correcting LED circuit |
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2011
- 2011-01-17 CN CN2011100092141A patent/CN102595683A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1683818A (en) * | 2005-02-23 | 2005-10-19 | 石为民 | Portable self-aid type lighting device |
| CN201028439Y (en) * | 2007-01-12 | 2008-02-27 | 吴富昌 | Brightness-adjustable lamp bead |
| CN101478849A (en) * | 2009-01-22 | 2009-07-08 | 广州南科集成电子有限公司 | Energy saving control circuit for LED lamp |
| CN201708974U (en) * | 2010-05-28 | 2011-01-12 | 郑榕彬 | Non-electrolytic capacitors power factor self-correcting LED circuit |
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Application publication date: 20120718 |