CN103619110B - A kind of circuit and method improving resistance-capacitance depressurization constant current accuracy - Google Patents
A kind of circuit and method improving resistance-capacitance depressurization constant current accuracy Download PDFInfo
- Publication number
- CN103619110B CN103619110B CN201310664944.4A CN201310664944A CN103619110B CN 103619110 B CN103619110 B CN 103619110B CN 201310664944 A CN201310664944 A CN 201310664944A CN 103619110 B CN103619110 B CN 103619110B
- Authority
- CN
- China
- Prior art keywords
- resistance
- circuit
- capacitance
- pressure drop
- voltage
- 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.)
- Active
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Landscapes
- Rectifiers (AREA)
Abstract
The present invention relates to electronic circuit field, disclose a kind of circuit and the method that improve resistance-capacitance depressurization constant current accuracy, comprise: constant flow module circuit, capacitance-resistance voltage reduction circuit, rectification circuit, wherein, described capacitance-resistance voltage reduction circuit is connected with described rectification circuit, for resistance-capacitance depressurization rectification, described constant flow module circuit is connected with resistance-capacitance depressurization rectification circuit, for realizing current constant, when load voltage change or input voltage ripple of power network, described constant flow module circuit regulates the pressure drop at described capacitance-resistance voltage reduction circuit two ends by controlling its pressure drop, the pressure drop at described capacitance-resistance voltage reduction circuit two ends is stablized, for the load in circuit provides high accuracy constant current.Adopt this technical scheme, the constant current accuracy of capacitance-resistance voltage reduction circuit can be improved, and cost is low.
Description
Technical field
The present invention relates to electronic circuit field, particularly a kind of circuit and method improving resistance-capacitance depressurization constant current accuracy.
Background technology
Capacitance-resistance voltage reduction circuit be utilize electric capacity to produce under certain AC signal frequency capacitive reactance to limit maximum output current.When electric capacity both end voltage fluctuates, (load change or input power network fluctuation) output current will cause larger fluctuation, cause output current constant current accuracy to be deteriorated, particularly be applied in field of LED illumination.
At present, LED illumination comes into huge numbers of families just step by step, and the capacitance-resistance voltage reduction circuit of low cost, high performance-price ratio will welcome new opportunity, but due to the constant current drive characteristic of LED and the problem of resistance-capacitance depressurization constant current accuracy difference will be again the huge challenge that designer faces.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of circuit improving resistance-capacitance depressurization constant current accuracy, for solving the problem of capacitance-resistance voltage reduction circuit two ends fluctuation of pressure drop, improve the constant current accuracy of capacitance-resistance voltage reduction circuit, and cost is low, structure is simple.
A kind of circuit improving resistance-capacitance depressurization constant current accuracy that the embodiment of the present invention provides, comprising: constant flow module circuit, capacitance-resistance voltage reduction circuit, rectification circuit, wherein,
Described capacitance-resistance voltage reduction circuit is connected with described rectification circuit, for resistance-capacitance depressurization rectification,
Described constant flow module circuit is connected with resistance-capacitance depressurization rectification circuit, for realizing current constant,
When load voltage change or input voltage ripple of power network, described constant flow module circuit regulates the pressure drop at described capacitance-resistance voltage reduction circuit two ends by controlling its pressure drop, the pressure drop at described capacitance-resistance voltage reduction circuit two ends is stablized, for the load in circuit provides high accuracy constant current
Described capacitance-resistance voltage reduction circuit comprises the first electric capacity C1 and the first resistance R1 in parallel with described first electric capacity C1.Also comprise the second resistance R2, the 3rd resistance, the 4th resistance, the second filter capacitor C2, wherein, described rectification circuit is rectifier bridge D1, the described first resistance R1 input that afterwards access described rectifier bridge D1 in parallel with described first electric capacity C1, described second resistance R2 is connected into described another input of rectifier bridge D1.The negative pole of output end of described rectifier bridge D1 is connected with the negative pole of described second filter capacitor C2, the 4th resistance respectively, and the output head anode of described rectifier bridge D1 is connected respectively at the positive pole of described second filter capacitor C2, the 4th resistance other end by described 3rd resistance.Alternatively, described constant flow module circuit comprises NPN triode Q1, 5th resistance R5, 6th resistance R6, 7th resistance R7, voltage-stabiliser tube D2, wherein, the base stage of described triode Q1 is by described 5th resistance R5, 6th resistance R6 and the first pin are connected with the positive pole of described second filter capacitor C2, the collector electrode of described triode Q1 is connected with the negative pole of described second filter capacitor C2 by the second pin, the emitter of described triode Q1 is connected with the 3rd pin by described 7th resistance R7, the negative pole of described voltage-stabiliser tube D2 is connected with the base stage of described triode Q1, the positive pole of described voltage-stabiliser tube D2 is connected with described 3rd pin, described 3rd pin is connected with the negative pole of described load, described load positive pole connects described second filter capacitor C2 positive pole, described voltage-stabiliser tube D2 pressure drop is VD2, triode Q1 base stage and emitter voltage drop are VBE, triode Q1 collector electrode and emitter voltage drop are VCE, when the system is stable, the constant output current of described constant flow module circuit is at (VD2-VBE)/R7, regulate the resistance of the 7th resistance R7 or voltage-stabiliser tube D2 pressure drop VD2 can regulate the constant output current of described constant flow module circuit, when input voltage increases, VCE increases to ensure the first electric capacity C1 two ends pressure drop constant, constant output current, when input voltage reduces, VCE reduces to ensure the first electric capacity C1 two ends pressure drop constant, constant output current.
Alternatively, described constant flow module circuit comprises at least two pins.
Alternatively, described load is LED.
Alternatively, described constant flow module circuit comprises integration module circuit and discrete electronic component.
Wherein, present invention also offers a kind of method improving resistance-capacitance depressurization constant current accuracy, constant flow module circuit is connected with resistance-capacitance depressurization rectification circuit,
When load voltage changes or when inputting voltage ripple of power network, described constant flow module circuit regulates the pressure drop at capacitance-resistance voltage reduction circuit two ends by controlling its pressure drop, the pressure drop at described capacitance-resistance voltage reduction circuit two ends is stablized, thus improve the constant current accuracy of described capacitance-resistance voltage reduction circuit, for the load in circuit provides high accuracy constant current, described resistance-capacitance depressurization rectification circuit comprises the first electric capacity C1, and the first resistance R1 in parallel with described first electric capacity C1, rectifier bridge D1, the described first resistance R1 input that afterwards access described rectifier bridge D1 in parallel with described first electric capacity C1, described constant flow module circuit regulates the pressure drop at capacitance-resistance voltage reduction circuit two ends by controlling its pressure drop, the pressure drop at described capacitance-resistance voltage reduction circuit two ends is stablized, specifically,
When load voltage increases maybe when inputting line voltage and reducing, constant flow module circuit reduces by controlling its pressure drop with the pressure drop of stablizing the first electric capacity C1 two ends, when load voltage reduces maybe when inputting line voltage and increasing, constant flow module circuit increases by controlling its pressure drop with the pressure drop of stablizing the first electric capacity C1 two ends.
Therefore, application the present embodiment technical scheme, due to solve capacitance-resistance voltage reduction circuit load change or input power network fluctuation time its two ends fluctuation of pressure drop problem, make the pressure drop at described capacitance-resistance voltage reduction circuit two ends keep stable, efficiently solve the constant current accuracy problem that capacitance-resistance voltage reduction circuit brings load change or input power network fluctuation.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of electrical block diagram improving resistance-capacitance depressurization constant current accuracy provided by the invention;
Fig. 2 is a kind of circuit diagram improving resistance-capacitance depressurization constant current accuracy provided by the invention;
Fig. 3 is a kind of method flow diagram improving resistance-capacitance depressurization constant current accuracy provided by the invention;
Fig. 4 is a kind of method flow diagram improving resistance-capacitance depressurization constant current accuracy provided by the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment 1:
The present embodiment provides a kind of circuit improving resistance-capacitance depressurization constant current accuracy, as shown in Figure 1, comprising: capacitance-resistance voltage reduction circuit 01, rectification circuit 02, constant flow module circuit 03, wherein,
Described capacitance-resistance voltage reduction circuit 01 is connected with described rectification circuit 02, for resistance-capacitance depressurization rectification,
Described constant flow module circuit 03 is connected with resistance-capacitance depressurization rectification circuit, for realizing current constant,
When load voltage change or input voltage ripple of power network, described constant flow module circuit 03 regulates the pressure drop at described capacitance-resistance voltage reduction circuit 01 two ends by controlling its pressure drop, the pressure drop at described capacitance-resistance voltage reduction circuit 01 two ends is stablized, for the load in circuit provides high accuracy constant current.
Can be, but not limited to, described constant flow module circuit 03 comprises at least two pins.
Can be, but not limited to, described load is LED, or other constant current driving devices.
Can be, but not limited to, described constant flow module circuit 03 comprises integration module circuit and discrete electronic component.
Therefore, when load change or input power network fluctuation, the pressure drop at described capacitance-resistance voltage reduction circuit two ends can be made to keep stable, efficiently solve the constant current accuracy problem that capacitance-resistance voltage reduction circuit brings load change or input power network fluctuation.
Embodiment 2:
The difference of the present embodiment and embodiment 1 is, as shown in Figure 2, described capacitance-resistance voltage reduction circuit 01 comprises the first electric capacity C1 and the first resistance R1 in parallel with described first electric capacity C1.
Also comprise the 3rd resistance R3, the 4th resistance R4, the second filter capacitor C2, wherein, described rectification circuit 02 is rectifier bridge D1,
The described first resistance R1 input that afterwards access described rectifier bridge D1 in parallel with described first electric capacity C1; Can be, but not limited to, also comprise the second resistance R2, described second resistance R2 is connected into described another input of rectifier bridge D1.
The negative pole of output end of described rectifier bridge D1 is connected with the negative pole of described second filter capacitor C2, the 4th resistance R4 respectively,
The output head anode of described rectifier bridge D1 is connected respectively at the positive pole of described second filter capacitor C2, the 4th resistance R4 other end by described 3rd resistance R3.
Described constant flow module circuit 03 comprises NPN triode Q1, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, voltage-stabiliser tube D2, wherein,
The base stage of described triode Q1 is connected with the positive pole of described second filter capacitor C2 by described 5th resistance R5, the 6th resistance R6 and the first pin, the collector electrode of described triode Q1 is connected with the negative pole of described second filter capacitor C2 by the second pin, the emitter of described triode Q1 is connected with the 3rd pin by described 7th resistance R7
The negative pole of described voltage-stabiliser tube D2 is connected with the base stage of described triode Q1, and the positive pole of described voltage-stabiliser tube D2 is connected with described 3rd pin,
Described 3rd pin is connected with the negative pole of described load, and described load positive pole connects described second filter capacitor C2 positive pole.
Described voltage-stabiliser tube D2 pressure drop is VD2, triode Q1 base stage and emitter voltage drop are VBE, triode Q1 collector electrode and emitter voltage drop are VCE,
When the system is stable, the constant output current of described constant flow module circuit, at (VD2-VBE)/R7, regulates the resistance of the 7th resistance R7 or voltage-stabiliser tube D2 pressure drop VD2 can regulate the constant output current of described constant flow module circuit,
When input voltage increases, VCE increases to ensure the first electric capacity C1 two ends pressure drop constant, constant output current,
When input voltage reduces, VCE reduces to ensure the first electric capacity C1 two ends pressure drop constant, constant output current.
Therefore, when load change or input power network fluctuation, by regulating described triode Q1 collector electrode and emitter voltage drop VCE, the pressure drop at described capacitance-resistance voltage reduction circuit two ends can be made to keep stable, efficiently solve the constant current accuracy problem that capacitance-resistance voltage reduction circuit brings load change or input power network fluctuation.
Embodiment 3:
Present invention also offers a kind of method improving resistance-capacitance depressurization constant current accuracy, as shown in Figure 3, comprising: 04, constant flow module circuit is connected with resistance-capacitance depressurization rectification circuit.
Can be, but not limited to, described resistance-capacitance depressurization rectification circuit comprises the first electric capacity C1 and first resistance R1, the rectifier bridge D1 in parallel with described first electric capacity C1, the described first resistance R1 input that afterwards access described rectifier bridge D1 in parallel with described first electric capacity C1.
05, when load voltage changes or when inputting voltage ripple of power network, described constant flow module circuit regulates the pressure drop at capacitance-resistance voltage reduction circuit two ends by controlling its pressure drop, and the pressure drop at described capacitance-resistance voltage reduction circuit two ends is stablized.Thus improve the constant current accuracy of described capacitance-resistance voltage reduction circuit, for the load in circuit provides high accuracy constant current.
As shown in Figure 4, described constant flow module circuit regulates the pressure drop at described first electric capacity C1 two ends by controlling its pressure drop, and the pressure drop at described first electric capacity C1 two ends is stablized, specifically,
06, when load voltage increases maybe when input line voltage reduce time, constant flow module circuit by control its pressure drop reduce with the pressure drop of stablizing the first electric capacity C1 two ends,
When load voltage reduces maybe when inputting line voltage and increasing, constant flow module circuit increases by controlling its pressure drop with the pressure drop of stablizing the first electric capacity C1 two ends.
Therefore technique scheme efficiently solves the constant current accuracy problem that capacitance-resistance voltage reduction circuit brings load change or input power network fluctuation.
Above-described execution mode, does not form the restriction to this technical scheme protection range.The amendment done within any spirit at above-mentioned execution mode and principle, equivalently to replace and improvement etc., within the protection range that all should be included in this technical scheme.
Claims (5)
1. improve a circuit for resistance-capacitance depressurization constant current accuracy, it is characterized in that, comprising: constant flow module circuit, capacitance-resistance voltage reduction circuit, rectification circuit, wherein,
Described capacitance-resistance voltage reduction circuit is connected with described rectification circuit, for resistance-capacitance depressurization rectification,
Described constant flow module circuit is connected with resistance-capacitance depressurization rectification circuit, for realizing current constant, when load voltage change or input voltage ripple of power network, described constant flow module circuit regulates the pressure drop at described capacitance-resistance voltage reduction circuit two ends by controlling its pressure drop, the pressure drop at described capacitance-resistance voltage reduction circuit two ends is stablized, for the load in circuit provides high accuracy constant current
Described capacitance-resistance voltage reduction circuit comprises the first electric capacity C1, and the first resistance R1 in parallel with described first electric capacity C1, described rectification circuit is rectifier bridge D1, also comprise the second resistance R2, 3rd resistance, 4th resistance, second filter capacitor C2, the described first resistance R1 input that afterwards access described rectifier bridge D1 in parallel with described first electric capacity C1, described second resistance R2 is connected into described another input of rectifier bridge D1, the negative pole of output end of described rectifier bridge D1 respectively with the negative pole of described second filter capacitor C2, 4th resistance connects, the output head anode of described rectifier bridge D1 is by the positive pole of described 3rd resistance respectively at described second filter capacitor C2, the 4th resistance other end connects,
Described constant flow module circuit comprises NPN triode Q1, 5th resistance R5, 6th resistance R6, 7th resistance R7, voltage-stabiliser tube D2, wherein, the base stage of described triode Q1 is by described 5th resistance R5, 6th resistance R6 and the first pin are connected with the positive pole of described second filter capacitor C2, the collector electrode of described triode Q1 is connected with the negative pole of described second filter capacitor C2 by the second pin, the emitter of described triode Q1 is connected with the 3rd pin by described 7th resistance R7, the negative pole of described voltage-stabiliser tube D2 is connected with the base stage of described triode Q1, the positive pole of described voltage-stabiliser tube D2 is connected with described 3rd pin, described 3rd pin is connected with the negative pole of described load, described load positive pole connects described second filter capacitor C2 positive pole, described voltage-stabiliser tube D2 pressure drop is VD2, triode Q1 base stage and emitter voltage drop are VBE, triode Q1 collector electrode and emitter voltage drop are VCE, when the system is stable, the constant output current of described constant flow module circuit is at (VD2-VBE)/R7, regulate the resistance of the 7th resistance R7 or voltage-stabiliser tube D2 pressure drop VD2 can regulate the constant output current of described constant flow module circuit, when input voltage increases, VCE increases to ensure the first electric capacity C1 two ends pressure drop constant, constant output current, when input voltage reduces, VCE reduces to ensure the first electric capacity C1 two ends pressure drop constant, constant output current.
2. a kind of circuit improving resistance-capacitance depressurization constant current accuracy as claimed in claim 1, is characterized in that, described constant flow module circuit comprises at least two pins.
3. a kind of circuit improving resistance-capacitance depressurization constant current accuracy as claimed in claim 1, is characterized in that, described load is LED.
4. a kind of circuit improving resistance-capacitance depressurization constant current accuracy as claimed in claim 1, is characterized in that, described constant flow module circuit comprises integration module circuit and discrete electronic component.
5. one kind is improved the method for resistance-capacitance depressurization constant current accuracy, it is characterized in that, constant flow module circuit is connected with resistance-capacitance depressurization rectification circuit, when load voltage changes or when inputting voltage ripple of power network, described constant flow module circuit regulates the pressure drop at capacitance-resistance voltage reduction circuit two ends by controlling its pressure drop, the pressure drop at described capacitance-resistance voltage reduction circuit two ends is stablized, thus improve the constant current accuracy of described capacitance-resistance voltage reduction circuit, for the load in circuit provides high accuracy constant current, described resistance-capacitance depressurization rectification circuit comprises the first electric capacity C1, and the first resistance R1 in parallel with described first electric capacity C1, rectifier bridge D1, the described first resistance R1 input that afterwards access described rectifier bridge D1 in parallel with described first electric capacity C1, described constant flow module circuit regulates the pressure drop at capacitance-resistance voltage reduction circuit two ends by controlling its pressure drop, the pressure drop at described capacitance-resistance voltage reduction circuit two ends is stablized, specifically, when load voltage increases maybe when inputting line voltage and reducing, constant flow module circuit reduces by controlling its pressure drop with the pressure drop of stablizing the first electric capacity C1 two ends, when load voltage reduces maybe when inputting line voltage and increasing, constant flow module circuit increases by controlling its pressure drop with the pressure drop of stablizing the first electric capacity C1 two ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310664944.4A CN103619110B (en) | 2013-12-10 | 2013-12-10 | A kind of circuit and method improving resistance-capacitance depressurization constant current accuracy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310664944.4A CN103619110B (en) | 2013-12-10 | 2013-12-10 | A kind of circuit and method improving resistance-capacitance depressurization constant current accuracy |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103619110A CN103619110A (en) | 2014-03-05 |
| CN103619110B true CN103619110B (en) | 2016-04-06 |
Family
ID=50169812
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310664944.4A Active CN103619110B (en) | 2013-12-10 | 2013-12-10 | A kind of circuit and method improving resistance-capacitance depressurization constant current accuracy |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103619110B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104302049A (en) * | 2014-09-28 | 2015-01-21 | 宁波公牛光电科技有限公司 | Led power source |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201260256Y (en) * | 2008-01-21 | 2009-06-17 | 上丰灯泡(深圳)有限公司 | LED driver circuit |
| CN201878375U (en) * | 2010-10-08 | 2011-06-22 | 泉州怡能光电科技有限公司 | LED (light-emitting diode) constant-voltage and constant-current driving circuit |
| CN202310178U (en) * | 2011-07-13 | 2012-07-04 | 黄显定 | Simple LED constant current source circuit under AC |
| CN202524600U (en) * | 2012-01-20 | 2012-11-07 | 深圳路明半导体照明有限公司 | Buck LED constant current drive control circuit |
-
2013
- 2013-12-10 CN CN201310664944.4A patent/CN103619110B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201260256Y (en) * | 2008-01-21 | 2009-06-17 | 上丰灯泡(深圳)有限公司 | LED driver circuit |
| CN201878375U (en) * | 2010-10-08 | 2011-06-22 | 泉州怡能光电科技有限公司 | LED (light-emitting diode) constant-voltage and constant-current driving circuit |
| CN202310178U (en) * | 2011-07-13 | 2012-07-04 | 黄显定 | Simple LED constant current source circuit under AC |
| CN202524600U (en) * | 2012-01-20 | 2012-11-07 | 深圳路明半导体照明有限公司 | Buck LED constant current drive control circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103619110A (en) | 2014-03-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102882410A (en) | Single-phase seven-level inverter | |
| CN103595248B (en) | A kind of Sofe Switch Boost topology circuit | |
| CN103236786A (en) | Voltage-sharing circuit and inverter | |
| CN105745807B (en) | A kind of DC-DC power source control circuit and electronic equipment | |
| CN205210746U (en) | Constant current control ware and constant current control circuit | |
| CN103619110B (en) | A kind of circuit and method improving resistance-capacitance depressurization constant current accuracy | |
| CN103630128A (en) | Circuit of single transformer for realizing luminance building-up and maintaining functions of laser gyroscope high-voltage power supply | |
| CN104753335A (en) | Quadratic form Buck power factor correction converter | |
| CN109152153B (en) | Current-adjustable LED driving circuit and control method | |
| CN102882412A (en) | Single-phase seven-level inverter | |
| CN202374179U (en) | Voltage-stabilizing circuit | |
| CN104467435A (en) | Balance modulation type multiplex output stabilized voltage supply based on logic protection amplifying circuit | |
| CN104467421A (en) | Switching power source based on switch voltage stabilizing type integrated circuit | |
| CN103729005A (en) | Negative voltage regulating circuit | |
| CN101192796A (en) | Voltage ascending power circuit | |
| CN204089581U (en) | The filter circuit of the main power power-supply of high pressure and the power supply input circuit of air conditioner | |
| CN102882411A (en) | Single-phase seven-level inverter | |
| CN204013181U (en) | A kind of control supply unit of voltage source unsteady flow module | |
| CN202364123U (en) | Circuit for improving multi-output cross regulation of switching power supply | |
| CN104519650A (en) | Constant current driving device and constant current driving method | |
| CN206640519U (en) | Inverter circuit and switching power supply | |
| CN204598363U (en) | A kind of constant current driving device | |
| CN103369792A (en) | LED drive circuit | |
| CN204481708U (en) | A kind of high-voltage power pipe and power module | |
| CN202019311U (en) | Controllable rectifying bridge for alternating-current generator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |