CN205040065U - Adjustable output current's constant voltage constant -current drive circuit - Google Patents
Adjustable output current's constant voltage constant -current drive circuit Download PDFInfo
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- CN205040065U CN205040065U CN201520744752.9U CN201520744752U CN205040065U CN 205040065 U CN205040065 U CN 205040065U CN 201520744752 U CN201520744752 U CN 201520744752U CN 205040065 U CN205040065 U CN 205040065U
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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
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Abstract
The utility model relates to an adjustable output current's constant voltage constant -current drive circuit, including supply circuit, output circuit and constant voltage constant current control circuit, constant voltage constant current control circuit passes through the current feedback input that supply circuit is connected to the opto -coupler module, constant voltage constant current circuit includes constant voltage control circuit and constant current control circuit, the constant current control circuit controller that the inverting input was held including having, non inverting input holds and compare the output, but output circuit's current sample end is connected through parallelly connected a plurality of break -make ohmic connection reference voltage, inverting input end to controller non inverting input end, and relatively inverting input end and opto -coupler module are connected simultaneously to the output. The utility model discloses a but adjustable output current's constant voltage constant -current drive circuit carries out reference voltage's adjustment through parallelly connected a plurality of break -make resistance to feed back to supply circuit, reach adjustment output current's purpose, effectively solve the LED light source load that a drive power supply was suitable for multiple different electric currents.
Description
Technical field
The utility model relates to a kind of output circuit, particularly a kind of constant pressure and flow drive circuit of output current adjustable.
Background technology
The driving power circuit of most of LED is all the output current on a road in the market, and control circuit mode all can only feed back a voltage signal to exporting control chip, and such application can be more single, and then the scope of application is very narrow.When the LED light source load of different electric current just cannot use, therefore the load-carrying scope of this circuit is more limited, for a LED drive power output parameter be: electric current 500mA voltage 24-42V, can only with the LED light source load of a 500mA electric current, when needing different output currents, then need again to change circuit parameter, virtually increase company's storage facility located at processing plant storage.
Summary of the invention
The purpose of this utility model is the defect in order to overcome above-mentioned background technology, provides a kind of constant pressure and flow drive circuit of output current adjustable.
A constant pressure and flow drive circuit for output current adjustable, comprises power supply circuits, output circuit and constant voltage constant current control circuit; Described power supply circuits input connects external power source, output connects the input of described output circuit and the power input of described constant voltage constant current control circuit; Described constant voltage constant current control circuit obtains sampled voltage and sample rate current from described output circuit; Described constant voltage constant current control circuit connects the feedback input end of described power supply circuits by optical coupling module; Described constant pressure and flow circuit comprises constant-voltage control circuit and constant-current control circuit, and described constant-current control circuit comprises the controller having inverting input, in-phase input end and compare output; Described controller in-phase input end can connect reference voltage by break-make resistance by the multiple of parallel connection, and inverting input connects the current sample end of described output circuit, compares output and connects described inverting input and described optical coupling module simultaneously.
Further, also protective resistance is connected between described reference voltage and in-phase input end.
Further, the multiple of described parallel connection can comprise the adjusting resistance of a series connection and adjust switch by each branch road of break-make resistance.
On the basis of foregoing circuit, preferably, multiple described adjustment switch forms a toggle switch.
Further, described controller inverting input and compare between output and be also provided with feedback circuit.
Further, described in-phase input end also connects the shunt resistance of a ground connection.
The constant pressure and flow drive circuit of a kind of output current adjustable of the present utility model multiplely can carry out the adjustment of reference voltage by break-make resistance by parallel, thus feed back to power supply circuits, reach the object of adjustment output current, effectively solve the LED light source load that a driving power is suitable for multiple different electric current.
Accompanying drawing explanation
Fig. 1 is the module principle figure in the utility model embodiment one.
Fig. 2 is the constant-current control circuit schematic diagram in the utility model embodiment one.
Embodiment
In order to allow those skilled in the art more understand the technical solution of the utility model, be further described below in conjunction with the constant pressure and flow drive circuit of the drawings and specific embodiments to output current adjustable of the present utility model.
A constant pressure and flow drive circuit for output current adjustable, comprises power supply circuits 1, output circuit 2 and constant voltage constant current control circuit 3.Wherein, power supply circuits 1 for external power source being converted to the DC power supply meeting output circuit 2 needs, simultaneously also for other component modules in drive circuit provide operating voltage.The DC power supply that output circuit 2 exports according to power supply circuits 1 exports the constant voltage constant current power meeting LED group 4 demand, simultaneously for constant voltage constant current control circuit 3 provides sampled voltage and sample rate current.Constant voltage constant current control circuit 3 then for according to the size of sampling resistor and sample rate current to power supply circuits 1 output feedback signal, power supply circuits 1 are made to export different power supplys, core of the present utility model is that constant voltage constant current control circuit 3 can adjust according to different LED group 4 loads simultaneously, makes drive circuit export suitable constant voltage constant current power.
Concrete, in the present embodiment, power supply circuits 1 comprise rectification circuit 11 and main control chip U1, and the input of rectification circuit 11 is connected to external power source, and output is then connected with the input of output circuit 2.Because outer power voltage is usually not identical with the supply power voltage of LED group 4, therefore also need between rectification circuit 11 and output circuit 2 to arrange a voltage changing module, the present embodiment then adopts winding to carry out transformation.Main control chip U1 then regulates rectification circuit 11 according to constant voltage constant current control circuit 3 simultaneously.
Output circuit 2 aspect, it is provided with voltage sample end VS and current sample end CS, for providing sampled voltage and sample rate current for constant voltage constant current control circuit 3.In addition, its output is then for LED group 4 provides power supply.
Constant voltage constant current control circuit 3 aspect, it comprises constant-voltage control circuit 32 and constant-current control circuit 33, wherein constant-voltage control circuit 32 is according to the size of sampled voltage, feedback signal is sent to main control chip U1 after comparing with reference voltage Vref, constant-current control circuit 33 is then according to the size of sample rate current, send feedback signal to main control chip U1 after comparing with reference voltage Vref, also reach adjustment drive circuit output current size object by the combination of divider resistance simultaneously.
Concrete, as shown in Figure 2.Constant-current control circuit 33 comprises the controller U2 having inverting input INT-, in-phase input end INT and compare output OUT2; This controller U2 has comparing function, the in-phase input end INT of controller U2 can connect reference voltage Vref by break-make resistance by the multiple of parallel connection, these parallel connections can in break-make resistance 311, each branch road all comprises adjusting resistance R2, R3, R4, R5 and the adjustment switch of a series connection, realizes the break-make of this branch road by closed or disconnection adjustment switch.Provide 4 branch roads in the present embodiment, drive circuit can be made to export 6 kinds of different output currents by the cooperation of these 4 branch roads.Thus realize the all-in resistance size of whole parallel circuits.In preferred embodiment, multiple adjustment switch can be replaced with a toggle switch CN1, from the overall performance improving product.
In order to ensure in-phase input end INT and being communicated with between reference voltage Vref, resistance R1 is also connected between reference voltage Vref and in-phase input end INT, resistance R1 and can power on/off 311 hinder between be also parallel relationship, when all can break-make resistance branch all disconnect time, electric current passes through from resistance R1, ensures the connection of reference signal.
Preferably, in order to protect in-phase input end INT, avoiding the excessive controller U2 that causes of electric current along bad, improving fail safe, in-phase input end INT also with the shunt resistance R6 of a ground connection.
The inverting input INT-of controller U2 connects the current sample end CS of output circuit 2 in addition, is also connected with protective resistance R7, for current limliting between current sample end CS and inverting input INT-simultaneously.Relatively output OUT2 is then connected to inverting input INT-by feedback circuit.In the present embodiment, feedback circuit is made up of a resistance R8 connected and electric capacity C1.In addition, output OUT2 is also connected to main control chip U1 feedback input end FB by an optical coupling module 12 is compared.The different signal that relatively output OUT2 exports changes the state of optical coupling module 12, thus exports different feedback signals to main control chip U1.Simultaneously at optical coupling module 12 with compare between output OUT2 and be also provided with a diode D1, the negative electrode of diode D1 connects and compares output OUT2, and anode connects optical coupling module 12.
In the present embodiment, constant-voltage control circuit 32 make use of the controller U2 with comparing function equally, in order to simplify the design of circuit, the controller U2 of constant-voltage control circuit 32 with constant-current control circuit 33 can be integrated, adopting AP4310 chip to replace.This chip internal is integrated with two comparators, and wherein the first comparator OUT1 controls constant-voltage control circuit 32, second comparator OUT2 and controls constant-current control circuit 33.The power input of controller U2 then connects power supply VCC, simultaneously by filter capacitor C2 ground connection.Preferably, VCC power supply also can be obtained to power supply circuits 1 by winding.
Further, optical coupling module 12 comprises an optocoupler 121, resistance R9 and electric capacity C3.Wherein resistance R9 two ends are connected with the negative electrode of optocoupler 121 and anode respectively, and anode connects the comparison output OUT2 of power supply VCC negative electrode then connection control device U2 simultaneously, and collector electrode connects the feedback input end FB grounded emitter of main control chip U1 in addition.In order to ensure the stable of electric current, collector electrode also arranges one for the electric capacity C3 of filtering.
Toggle switch CN1 needs according to LED light source load the dial-up key setting corresponding current parameter, adjusting resistance R2, R3, R4, the R5 in circuit is optionally connected as toggle switch CN1, thus produce different feedback voltage signals to main control chip U1, adjustment output current.Therefore toggle switch CN1 controls bleeder circuit and effectively can solve the technology barriers that a driving power is suitable for the LED light source load of multiple different electric current.
For a LED drive power output parameter be: electric current: 500mA voltage: 24-42V, may be used for 250mA, 300mA, 350mA, 400mA, 450mA and 500mA etc., the LED light source load of the different current parameters of each manufacturer all can steady operation, increases substantially power adaptation.
By reference to the accompanying drawings execution mode of the present utility model is explained in detail above, but the utility model is not limited to above-mentioned execution mode, in the ken that those of ordinary skill in the art possess, various change can also be made under the prerequisite not departing from the utility model aim.
Claims (6)
1. a constant pressure and flow drive circuit for output current adjustable, comprises power supply circuits, output circuit and constant voltage constant current control circuit; Described power supply circuits input connects external power source, output connects the input of described output circuit and the power input of described constant voltage constant current control circuit; Described constant voltage constant current control circuit obtains sampled voltage and sample rate current from described output circuit; It is characterized in that: described constant voltage constant current control circuit connects the feedback input end of described power supply circuits by optical coupling module; Described constant pressure and flow circuit comprises constant-voltage control circuit and constant-current control circuit, and described constant-current control circuit comprises the controller having inverting input, in-phase input end and compare output; Described controller in-phase input end can connect reference voltage by break-make resistance by the multiple of parallel connection, and inverting input connects the current sample end of described output circuit, compares output and connects described inverting input and described optical coupling module simultaneously.
2. drive circuit as claimed in claim 1, is characterized in that: be also connected to protective resistance between described reference voltage and in-phase input end.
3. drive circuit as claimed in claim 1, is characterized in that: the multiple of described parallel connection can comprise the adjusting resistance of a series connection and adjust switch by each branch road of break-make resistance.
4. drive circuit as claimed in claim 3, is characterized in that: multiple described adjustment switch forms a toggle switch.
5. drive circuit as claimed in claim 4, is characterized in that: the inverting input of described controller and compare between output and be also provided with feedback circuit.
6. drive circuit as claimed in claim 4, is characterized in that: described in-phase input end also connects the shunt resistance of a ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520744752.9U CN205040065U (en) | 2015-09-24 | 2015-09-24 | Adjustable output current's constant voltage constant -current drive circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520744752.9U CN205040065U (en) | 2015-09-24 | 2015-09-24 | Adjustable output current's constant voltage constant -current drive circuit |
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| CN205040065U true CN205040065U (en) | 2016-02-17 |
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| CN201520744752.9U Expired - Fee Related CN205040065U (en) | 2015-09-24 | 2015-09-24 | Adjustable output current's constant voltage constant -current drive circuit |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106376142A (en) * | 2016-10-31 | 2017-02-01 | 恒亦明（重庆）科技有限公司 | Identity load and power output parameter self-adjusting system |
| CN106793311A (en) * | 2016-12-29 | 2017-05-31 | 铜陵迈维电子科技有限公司 | The LED Intelligent constant flow constant-voltage driving power sources of tunable optical |
| CN106793315A (en) * | 2016-12-29 | 2017-05-31 | 铜陵迈维电子科技有限公司 | LED Intelligent constant flow constant-voltage driving power sources |
| WO2018045696A1 (en) * | 2016-09-09 | 2018-03-15 | 深圳创维－Rgb电子有限公司 | Switching power supply and television |
| CN109152149A (en) * | 2018-10-13 | 2019-01-04 | 深圳市比尔达科技有限公司 | Self-adapting detecting firm power exports emergency power supply control circuit and its emergency power supply |
| CN111358354A (en) * | 2018-12-26 | 2020-07-03 | 北京奇虎科技有限公司 | Sweeping robot and sweeping motor power supply circuit thereof |
-
2015
- 2015-09-24 CN CN201520744752.9U patent/CN205040065U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018045696A1 (en) * | 2016-09-09 | 2018-03-15 | 深圳创维－Rgb电子有限公司 | Switching power supply and television |
| CN106376142A (en) * | 2016-10-31 | 2017-02-01 | 恒亦明（重庆）科技有限公司 | Identity load and power output parameter self-adjusting system |
| CN106793311A (en) * | 2016-12-29 | 2017-05-31 | 铜陵迈维电子科技有限公司 | The LED Intelligent constant flow constant-voltage driving power sources of tunable optical |
| CN106793315A (en) * | 2016-12-29 | 2017-05-31 | 铜陵迈维电子科技有限公司 | LED Intelligent constant flow constant-voltage driving power sources |
| CN109152149A (en) * | 2018-10-13 | 2019-01-04 | 深圳市比尔达科技有限公司 | Self-adapting detecting firm power exports emergency power supply control circuit and its emergency power supply |
| CN109152149B (en) * | 2018-10-13 | 2024-04-19 | 深圳市比尔达科技有限公司 | Self-adaptive detection constant power output emergency power supply control circuit and emergency power supply thereof |
| CN111358354A (en) * | 2018-12-26 | 2020-07-03 | 北京奇虎科技有限公司 | Sweeping robot and sweeping motor power supply circuit thereof |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160217 Termination date: 20210924 |