CN201319688Y - Constant current and voltage circuit - Google Patents
Constant current and voltage circuit Download PDFInfo
- Publication number
- CN201319688Y CN201319688Y CNU200820234896XU CN200820234896U CN201319688Y CN 201319688 Y CN201319688 Y CN 201319688Y CN U200820234896X U CNU200820234896X U CN U200820234896XU CN 200820234896 U CN200820234896 U CN 200820234896U CN 201319688 Y CN201319688 Y CN 201319688Y
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- constant
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- 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
Abstract
The utility model discloses a circuit simultaneously having two functions of constant current and constant voltage, the constant current and voltage circuit has the advantages of simple structure, high efficiency and low power consumption, and saves energy and prolongs the service life of load. The constant current and voltage circuit comprises a rectification circuit (1), a voltage stabilizing circuit (2) and a load (3), wherein alternating current is output from an output end of the voltage stabilizing circuit (2) after being rectified by the rectification circuit (1), and passes through the load (3) after becoming constant-voltage direct current, the constant current and voltage circuit further comprises a constant-current source device (4), wherein the constant-current source device (4) is connected between the output end (A) of the load (3) and the earthing end (G) of the whole circuit. The circuit can be widely used for the field of constant current and voltage circuits.
Description
Technical field
The utility model relates to a kind of constant-current constant-voltage circuit.
Background technology
At present, the application of LED more and more widely is used for daily indoor also just more and more universal with LED light fixture outdoor lighting.Present led drive circuit generally all is current stabilization or voltage stabilizing circuit to be set, the circuit that does not have constant current and two kinds of functions of constant voltage simultaneously separately.Fig. 1 is a kind of existing isolation type switching power supply voltage stabilizing circuit, so-called " isolated " is meant that the earth terminal of the both sides of transformer is independently, though it is stable that the voltage of the power output end of sort circuit can keep, but because its conducting voltage can descend after the LED long-term work at high temperature, if therefore the voltage at LED two ends remains unchanged, then its operating current can raise.So in the practical application of voltage stabilizing circuit, in use for some time, the phenomenon that the rising owing to electric current causes LED to be burnt usually can take place, reduction of service life.Fig. 2 is a kind of existing non-isolated power supply constant-current circuit, though sort circuit can guarantee the current stabilization of output, but under the situation of a plurality of load parallel connections, then can cause the inequality of electric current in each branch road to distribute, so that after a paths of LEDs burns, quicken to cause all burning of a paths of LEDs easily.
" MOSFET " is the abbreviation of English " metal-oxide-semiconductor field effect transistor ", and meaning i.e. " mos field effect transistor ", and its principle is the basis of all modern integrated circuits chips.A depletion type MOS FET device is made of three essential parts: source electrode (S), grid (G) and drain electrode (D).N-channel depletion mode metal-oxide-semiconductor field effect transistor near gate surface, has a shallow-layer doped layer with source leakage same polarity that source electrode is connected with drain electrode between source electrode and drain electrode.When grid and source voltage are timing, its saturation conduction electric current also increases with voltage increases, and this point is identical with enhancement mode MOSFET.But when grid and source electrode are idiostatic, when drain electrode imposes malleation, exhaust the linear zone that pipe rose through current spikes before this, just enter the saturation region of constant current conducting then, the drain voltage of this moment is known as saturation voltage, the size of drain electrode conducting electric current is relevant with the concentration and the degree of depth of shallow-layer doped layer, and general concentration and the big more then electric current of the degree of depth are big more.Impose negative voltage between grid and source electrode, then passage can be cut off, and the conducting electric current is zero, and the grid voltage of this moment is defined as cut-in voltage, if but channel concentration is too dense, the degree of depth is too dark, and then grid can't block channel current.Depletion type MOS tube is because when grid and source voltage were zero, the drain-source electrode current had been the constant current conducting, and it is convenient on logic is used that this point causes it to be not so good as the enhancement mode metal-oxide-semiconductor, uses so do not made device separately by industrial quarters so far.Since depletion type MOS tube when grid voltage is zero the characteristic of conducting and when drain voltage increases electric current puncture up to drain avalanche in the saturation region substantially, so it can be used as a constant-current source use.
The utility model content
Technical problem to be solved in the utility model is to overcome the deficiencies in the prior art, and a kind of circuit that has constant current and two kinds of functions of constant voltage simultaneously is provided, and this constant-current constant-voltage circuit is simple in structure, efficient is high, low in energy consumption, energy-conservation, can prolong the useful life of load.
The technical scheme that the utility model adopted is: the utility model comprises rectification circuit, voltage stabilizing circuit, load, the described load of flowing through behind the direct current of alternating current through become constant voltage after the described rectification circuit rectification from the output of the output of described voltage stabilizing circuit, described constant-current constant-voltage circuit also comprises constant-current source device, and described constant-current source device is connected between the earth terminal of the output of described load and entire circuit.
Described constant-current source device is a depletion mode fet.
The drain electrode of described depletion mode fet is a contact, and the source electrode of described depletion mode fet and grid short circuit mutually constitute another contact.
Described load comprises at least one group of several LED that are in series.
Every group of described LED all is in series with a described constant-current source device, and after the series connection some groups are connected between the output and described earth terminal of described voltage stabilizing circuit again.
Perhaps, each is in series with a described constant-current source device after organizing described LED parallel connection again, is connected between the output and described earth terminal of described voltage stabilizing circuit.
Described voltage stabilizing circuit is a Switching Power Supply.
Described voltage stabilizing circuit comprises circuit of power factor correction.
Described load is electronic circuit or the DC motor or the high resistive electrothermal load of direct current supply.
Described constant-current constant-voltage circuit also comprises short-circuit protection circuit, and described short-circuit protection circuit is connected between the input and described rectification circuit of AC power, and described rectification circuit adopts bridge rectifier.
The beneficial effects of the utility model are: because the utility model comprises rectification circuit; voltage stabilizing circuit; load; constant-current source device; the described load of flowing through behind the direct current of alternating current through become constant voltage after the described rectification circuit rectification from the output of the output of described voltage stabilizing circuit; described constant-current source device is connected between the earth terminal of the output of described load and entire circuit; by described rectification circuit; described voltage stabilizing circuit obtains stable voltage output; even load such as led light source at high temperature work long hours; when the electric current desire of light source load increases; described constant-current source device can stop electric current to increase; and the voltage that led light source is descended is added on the described constant-current source device; prolong the useful life of load such as led light source; avoid burning; described constant-current source device is as an independent devices; convenient peripheral voltage stabilizing and the current stabilization circuit of replacing existing other circuit; make circuit element significantly reduce; circuit is simple; so the utility model has constant current and two kinds of functions of constant voltage simultaneously; this constant-current constant-voltage circuit is simple in structure; the efficient height; low in energy consumption; energy-conservation; can prolong the useful life of load; and have the over-current over-voltage protection function, be applied to save in the LED illuminating circuit power consumption of entire circuit.
Description of drawings
Fig. 1 is a kind of schematic diagram of existing isolation type switching power supply voltage stabilizing circuit;
Fig. 2 is a kind of schematic diagram of existing non-isolated power supply constant-current circuit;
Fig. 3 is the circuit diagram of the utility model embodiment one;
Fig. 4 is the circuit diagram of the utility model embodiment two;
Fig. 5 is the circuit diagram of the utility model embodiment three.
Embodiment
Embodiment one:
As shown in Figure 3; the constant-current constant-voltage circuit of present embodiment comprises rectification circuit 1; voltage stabilizing circuit 2; load 3; constant-current source device 4; short-circuit protection circuit 5; the described load 3 of flowing through behind the direct current of alternating current through become constant voltage after described rectification circuit 1 rectification from the output of the output of described voltage stabilizing circuit 2; described rectification circuit 1 adopts by four rectifier diode D1; D2; D3; the bridge rectifier that D4 forms; described short-circuit protection circuit 5 comprises fuse F1 and piezo-resistance RV1; be used for overcurrent and short-circuit protection; be connected between the input and described rectification circuit 1 of AC power; described voltage stabilizing circuit 2 is Switching Power Supplies; described constant-current source device 4 is a depletion mode fet; the drain electrode of described depletion mode fet is a contact; the source electrode of described depletion mode fet and grid short circuit mutually constitute another contact; described voltage stabilizing circuit 2 comprises circuit of power factor correction IC1; the model that described circuit of power factor correction IC1 adopts ST company to produce is the power supply PFC power factor control circuit of L6561; it is simple that it has a circuit; the efficient advantages of higher; be widely used at present in the power circuit of required power factor correctings such as electricity-saving lamp; its peripheral cell comprises six capacitor C 1～C6; 11 resistance R 1～R9; R1 '; R9 '; three diode D5～D7; a metal-oxide-semiconductor Q1; an inductance coil T1; described load 3 comprises one group of several LED that are in series; each described LED and a described constant-current source device 4 are in series; be connected to the earth terminal G of entire circuit after the series connection again, constitute the loop so that described constant-current source device 4 couples together the output terminals A of described load 3 and described earth terminal G.The quantity of the described LED of several that are in series should be looked the voltage V of the output of described voltage stabilizing circuit 2
0, described constant-current source device 4 two ends voltage V
DAnd the conducting voltage V of average each described LED
FAnd decide, the operating voltage of general described constant-current source device 4 is 2～10V, so the number of described LED approximates (V
0-V
D)/V
F
The utility model is by described rectification circuit 1, described voltage stabilizing circuit 2 obtains stable voltage output, even the load led light source at high temperature works long hours, when the electric current desire of light source load increases, described constant-current source device 4 can stop electric current to increase, and the voltage that led light source is descended is added on the described constant-current source device 4, prolong the useful life of load led light source, avoid burning, described constant-current source device 4 is as an independent devices, convenient peripheral voltage stabilizing and the current stabilization circuit of replacing existing other circuit, make circuit element significantly reduce, circuit is simple, can prolong the useful life of load.Described depletion mode fet needs and adjusts at grid, the electric current of the visual LED of saturation current when source electrode is idiostatic, so can provide the constant current supply to LED; Though the output end voltage of described voltage stabilizing circuit 2 is stable; but; since load for a long time under the hot operation condition voltage can descend; the part that this moment, voltage descended will be added between the drain electrode of described depletion mode fet and the source electrode and can not influence as the LED of load simultaneously when the output voltage instability; particularly be higher than under the situation of normal pressure; exceed voltage segment and will be added between the drain electrode of described depletion mode fet and the source electrode and can not influence LED, so can reach the function of constant current protection LED as load.Therefore, the utility model can provide the output of voltage and current stabilization simultaneously to load, and is especially suitable for demanding load in useful life.
Depletion mode fet described in the utility model can adopt following method manufacturing:
(1) upper surface with P-type silicon substrate grows the protect oxide layer film at oxidation boiler tube internal heating oxidation, utilizes first reticle to carry out photoetching then on mask aligner, again with containing the corrosive liquid of HF to the etching of described protect oxide layer film;
(2) boron difluoride or the doping of boron ion P type are injected in the described silicon substrate, give high temperature again and drive in, the P+ contact zone that forms the P+ guard ring and contact with described silicon substrate;
(3) on mask aligner, utilize second reticle to carry out photoetching, with dry method etch technology oxide layer is carried out etching again, with ion implantor arsenic ion or phosphonium ion or the two are mixed then and inject described silicon substrate, form the N+ heavily doped region, promptly form N+ source region, N+ drain region and N+ guard ring;
(4) on mask aligner, utilize the 3rd reticle to carry out photoetching, with the corrosive liquid that contains HF the oxide layer of Resistance is carried out etching, form oxide layer with dried oxygen of high temperature or wet oxygen then, inject phosphonium ion then or the boron ion that additionally reinjects, give high temperature again and drive in, finally form N-channel region and oxide layer;
(5) on mask aligner, utilize the 4th reticle to carry out photoetching, with etch process described oxide layer is carried out etching again, form drain electrode through hole, source electrode N+ through hole, substrate P+ through hole;
(6) with the method depositing metal layers of sputter or evaporation, on mask aligner, utilize the metal level lay photoetching mask plate to carry out photoetching then, with dry method or wet etching process metal level is carried out etching again, form drain metal, source metal, gate metal and connect metal.
Embodiment two:
As shown in Figure 4, the difference of present embodiment and embodiment one is: the described load 3 of present embodiment comprises four groups of several LED that are in series, every group of described LED all is in series with a described constant-current source device 4, after the series connection four groups are connected between the output of described voltage stabilizing circuit 2 and the described earth terminal G again and constitute the loop, so present embodiment has four described constant-current source devices 4.In the present embodiment, the quantity Calculation mode of the every group of described LED that contacts mutually is identical with embodiment one.
All the other features of present embodiment are with embodiment one.
Embodiment three:
As shown in Figure 5, the difference of present embodiment and embodiment one is: the described load 3 of present embodiment comprises four groups of several LED that are in series, each is in series with a described constant-current source device 4 after organizing described LED parallel connection again, is connected between the output of described voltage stabilizing circuit 2 and the described earth terminal G to constitute the loop.Be that present embodiment has only a described constant-current source device 4.
All the other features of present embodiment are with embodiment one.
Certainly, the electronic circuit that described load 3 of the present utility model also can be direct current supply or other loads such as DC motor or high resistive electrothermal load, when adopting these loads, constant-current constant-voltage circuit of the present utility model has the advantage of the foregoing description equally.
The utility model can be widely used in field of constant current and constant voltage.
Claims (10)
1, a kind of constant-current constant-voltage circuit, comprise rectification circuit (1), voltage stabilizing circuit (2), load (3), the described load (3) of flowing through behind the direct current of alternating current through become constant voltage after described rectification circuit (1) rectification from the output of the output of described voltage stabilizing circuit (2), it is characterized in that: described constant-current constant-voltage circuit also comprises constant-current source device (4), and described constant-current source device (4) is connected between the earth terminal (G) of the output (A) of described load (3) and entire circuit.
2, constant-current constant-voltage circuit according to claim 1 is characterized in that: described constant-current source device (4) is a depletion mode fet.
3, constant-current constant-voltage circuit according to claim 2 is characterized in that: the drain electrode of described depletion mode fet is a contact, and the source electrode of described depletion mode fet and grid short circuit mutually constitute another contact.
4, constant-current constant-voltage circuit according to claim 1 is characterized in that: described load (3) comprises at least one group of several LED that are in series.
5, constant-current constant-voltage circuit according to claim 4, it is characterized in that: every group of described LED all is in series with a described constant-current source device (4), and after the series connection some groups are connected between the output and described earth terminal (G) of described voltage stabilizing circuit (2) again.
6, constant-current constant-voltage circuit according to claim 4 is characterized in that: each is in series with a described constant-current source device (4) after organizing described LED parallel connection again, is connected between the output and described earth terminal (G) of described voltage stabilizing circuit (2).
7, constant-current constant-voltage circuit according to claim 1 is characterized in that: described voltage stabilizing circuit (2) is a Switching Power Supply.
8, constant-current constant-voltage circuit according to claim 1 is characterized in that: described voltage stabilizing circuit (2) comprises circuit of power factor correction.
9, constant-current constant-voltage circuit according to claim 1 is characterized in that: described load (3) is electronic circuit or the DC motor or the high resistive electrothermal load of direct current supply.
10, constant-current constant-voltage circuit according to claim 1; it is characterized in that: described constant-current constant-voltage circuit also comprises short-circuit protection circuit (5); described short-circuit protection circuit (5) is connected between the input and described rectification circuit (1) of AC power, and described rectification circuit (1) adopts bridge rectifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820234896XU CN201319688Y (en) | 2008-12-10 | 2008-12-10 | Constant current and voltage circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200820234896XU CN201319688Y (en) | 2008-12-10 | 2008-12-10 | Constant current and voltage circuit |
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| Publication Number | Publication Date |
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| CN201319688Y true CN201319688Y (en) | 2009-09-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200820234896XU Expired - Fee Related CN201319688Y (en) | 2008-12-10 | 2008-12-10 | Constant current and voltage circuit |
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| CN (1) | CN201319688Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102404903A (en) * | 2010-09-13 | 2012-04-04 | 台达电子工业股份有限公司 | Lamp driving device |
| WO2012100683A1 (en) * | 2011-01-24 | 2012-08-02 | 广州南科集成电子有限公司 | Constant current led lighting circuit with high power factor |
| CN102739078A (en) * | 2011-03-30 | 2012-10-17 | 东芝照明技术株式会社 | Switching power-supply device and luminaire |
| US8749176B2 (en) | 2010-09-10 | 2014-06-10 | Delta Electronics, Inc. | Lamp driving device |
| CN106208296A (en) * | 2016-08-22 | 2016-12-07 | 刘珉恺 | Constant-current charging circuit based on Simple switch voltage source |
-
2008
- 2008-12-10 CN CNU200820234896XU patent/CN201319688Y/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8749176B2 (en) | 2010-09-10 | 2014-06-10 | Delta Electronics, Inc. | Lamp driving device |
| CN102404903A (en) * | 2010-09-13 | 2012-04-04 | 台达电子工业股份有限公司 | Lamp driving device |
| WO2012100683A1 (en) * | 2011-01-24 | 2012-08-02 | 广州南科集成电子有限公司 | Constant current led lighting circuit with high power factor |
| CN102739078A (en) * | 2011-03-30 | 2012-10-17 | 东芝照明技术株式会社 | Switching power-supply device and luminaire |
| CN102739078B (en) * | 2011-03-30 | 2014-12-24 | 东芝照明技术株式会社 | Switching power-supply device and luminaire |
| CN106208296A (en) * | 2016-08-22 | 2016-12-07 | 刘珉恺 | Constant-current charging circuit based on Simple switch voltage source |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090930 Termination date: 20121210 |