CN111278194A - High-precision LED driver - Google Patents
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- CN111278194A CN111278194A CN201811367440.5A CN201811367440A CN111278194A CN 111278194 A CN111278194 A CN 111278194A CN 201811367440 A CN201811367440 A CN 201811367440A CN 111278194 A CN111278194 A CN 111278194A
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- 238000000034 method Methods 0.000 claims abstract description 24
- 239000004065 semiconductor Substances 0.000 claims abstract description 8
- 230000005669 field effect Effects 0.000 claims abstract description 6
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 4
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 4
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 230000009977 dual effect Effects 0.000 claims description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- JPJALAQPGMAKDF-UHFFFAOYSA-N selenium dioxide Chemical compound O=[Se]=O JPJALAQPGMAKDF-UHFFFAOYSA-N 0.000 description 1
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Abstract
The present invention relates to a high precision Light Emitting Diode (LED) driver and a method of driving an LED. The high precision LED driver includes a converter circuit. The converter circuit comprises an adjustable sensing resistor (R)CS) At least one mechanical switch and at least one Metal Oxide Semiconductor Field Effect Transistor (MOSFET). The adjustable sensing resistor (R)CS) Having at least two sensing resistors (R) arranged in parallelCS 1..RCS n). The at least one MOSFET is configured to sense the resistance (R)CS 1、RCS 2) One of which is switched in parallel to the remaining sense resistor (R)CS n) Or disconnect it. The gate of the at least one MOSFET is controlled by means of at least one mechanical switch.
Description
Technical Field
The present invention relates to a high precision Light Emitting Diode (LED) driver and a method of driving an LED. In particular, the present invention relates to a high precision LED driver and a method for driving an LED having at least one Metal Oxide Semiconductor Field Effect Transistor (MOSFET) controlled by a mechanical switch.
Background
More and more different LED drivers are used to accommodate LED modules. LED modules have a variety of different series-parallel connections so that the output voltage and current required in each application is typically different. Typically, an LED driver utilizing DIP switches will accomplish this function. Since the mechanical switch has approximately 0.1 omega ohm]Or larger contactThe resistance, and in particular the contacts are easily oxidized after a long operation, the contact resistance will become larger and larger, e.g. up to 1 Ω. Therefore, the tolerance of the contact resistance will also become large (about 10% [ percent ]]) And then the output current tolerance may become very large (about 20%). Because of the high current flowing through the mechanical switch in the LED driver, the power loss of the mechanical switch will limit the output current of the LED driver and thus the power supplied to the LEDs will be very small (about 20W watt [ [ watt ] ])]). In detail, a circuit including a buck conversion follower with an Integrated Circuit (IC) controller may be used to drive the LEDs. The output current of the LED can be controlled by changing the sensing resistance (R)CS) The value is adjusted. In addition, at least one and the first sensing resistor (R)CS 1) DIP switch in series with last sense resistor (R)CS n) And (4) connecting in parallel. Different output currents (2) can be adjusted depending on whether at least one DIP switch is open or closedn-1). With this circuit, the contact resistance of at least one DIP switch is large, so that the uniformity as described above is poor. Furthermore, the contacts of at least one DIP switch can easily oxidize, so that the contact resistance increases resulting in even worse current accuracy. Furthermore, the contacts of the at least one DIP switch may easily oxidize, causing the contact resistance to increase, resulting in poorer current accuracy. Also, current (I) is sensed in particular when the IC controller is in operation and the mechanical switch is switching noise in the circuitCS) The noise in (b) may easily occur. Furthermore, when the output power and/or the output current is large, for example, the output power is equal to or greater than 30W [ Watt ]]The high temperature caused by the increased DIP switch losses will plastically deform the DIP switch.
Disclosure of Invention
It is therefore an object of the present invention to prevent or at least mitigate the above-mentioned disadvantages and problems of the prior art. Further, a high precision LED driver according to independent claim 1 and a method for driving an LED according to another independent claim are disclosed. Further embodiments or improvements of the independent claims are the subject matter of the dependent claims. The subsequently described subject matter as well as the embodiments and the improved features can be combined in any technically meaningful way, except in combinations that are explicitly described as being impossible.
According to a first aspect, a high precision Light Emitting Diode (LED) driver comprises a converter circuit. The converter circuit is configured to convert an input current (I)IN、AC) And input voltage (U)IN、AC) Conversion to an output current (I) for the LEDOUT、DC) And an output voltage (U)OUT、DC). The converter circuit comprises an adjustable sensing resistor (R)CS) At least one mechanical switch and at least one Metal Oxide Semiconductor Field Effect Transistor (MOSFET). The adjustable sensing Resistor (RCS) has at least two sensing resistors (R) arranged in parallelCS 1..RCS n). At least one MOSFET is configured for sensing a resistance (R)CS 1、RCS 2) Is switched in parallel to the remaining sense resistor (R)CS n) Or disconnected. The gate of the at least one MOSFET is controlled by at least one mechanical switch.
According to a second aspect, a method of driving an LED comprises inputting a current (I)IN、AC) And input voltage (U)IN、AC) Conversion to an output current (I) for an LEDOUT、DC) And an output voltage (U)OUT、DC). The switching comprises at least two sensing resistances (R) arranged in parallel by controlling the gate of at least one MOSFET by means of at least one mechanical switchCS 1..RCS n) A sense resistor (R)CS 1，RCS 2) And an adjustable sensing resistor (R)CS) Is switched in parallel to the remaining sense resistor (R)CS n)。
The term MOSFET is used herein as a synonym for the term metal-insulator-semiconductor field effect transistor (MISFET) or Insulated Gate Field Effect Transistor (IGFET). The converter circuit may be any type of converter circuit like a buck converter, a boost topology, a buck-boost converter, a flyback converter, an LLC topology, a single-Ended Primary Inductor Converter (EPIC), a half-bridge topology lamp, etc. Input current (I)IN、AC) And input voltage (U)IN、AC) And may be either direct current or alternating current. Output electricityStream (I)OUT、DC) And an output voltage (U)OUT、DC) Is direct current. Input current (I)IN、AC) And input voltage (U)IN、AC) Adjusted according to the requirements of the LED. Inputting a current (I) through a converter circuitIN、AC) Step-up and input voltage (U)IN、AC) Step by step and vice versa. To enable the input of a current (I)IN、AC) And input voltage (U)IN、AC) Conversion to different output currents (I)OUT、DC) And an output voltage (U)OUT、DC) Adjustable sensing resistance (R)CS) Can be adjusted to different resistance values. Furthermore, at least two sensing resistors (R) arranged in parallelCS 1..RCS 2) Can be switched in parallel to the remaining sensing resistances (R)CS n) Or disconnected. Here disconnected means that the remaining sense resistor (R) is cut offCS n) Are connected in parallel. At least one sensing resistor (R)CS 1、RCS 2) Is influenced by the at least one MOSFET. The at least one MOSFET is arranged in series to the at least one sense resistor (R)CS 1、RCS 2) The sensing resistance will be switched to be connected in parallel to the remaining sensing resistance (R)CS n) Or disconnected. The conductivity of the MOSFET from its drain to its source is controlled by the voltage of the insulated gate of the MOSFET. The MOSFET has a threshold voltage (U)TH) The threshold voltage (U)TH) For determining the conduction from source to drain. Adjustable sensing resistor (R)CS) Is determined by applying at least one sense resistor (R)CS 1、RCS 2) Switched in parallel to the remaining sensing resistors (R)CS n) Adjusted by being equal to or higher than a threshold voltage (U)TH) Is applied to the gate of the corresponding MOSFET or is not applied or is below the threshold voltage (U)TH) Depending on the type of the respective MOSFET (n-type or p-type). The voltage for switching the at least one MOSFET is provided to the gate of the at least one MOSFET and can be switched off via at least one mechanical switch. The at least one mechanical switch may be double-rowA direct-insert package (DIP) switch or a jumper block, etc. A voltage for switching the at least one MOSFET is provided to the gate of the at least one MOSFET as long as the at least one mechanical switch is closed. Thus, the voltage for switching the MOSFETs is equal to or higher than the threshold voltage (U) of at least one MOSFETTH). Depending on the type of MOSFET (n-type or p-type), the MOSFET can conduct from drain to source when the mechanical switch is closed and a voltage for switching the at least one MOSFET is applied to the gate. Thus, the adjustable sense resistance (R) is adjusted by opening or closing (switching) a mechanical switch (ON or OFF)CS) While at least one sense resistor (R)CS 1、RCS 2) Is influenced by the MOSFET, which is controlled by a mechanical switch.
By means of an adjustable sense resistor (R) according to at least one MOSFET pair of a high precision LED driverCS) At least one sense resistance (R)CS 1、RCS 2) And a method for driving an LED provide a high precision current supplied to the LED even after many switching operations. The contact resistance of a mechanical switch, such as a dip switch, may initially be about 50m omega milliohms]And rises to 100m omega with each switching operation, in other words, the contact resistance can double with the lifetime of the mechanical switch. In contrast, the drain-source resistance of a MOSFET may initially be between 20 and 35m Ω and rise by about 1/3. The switching accuracy is thus significantly improved when MOSFETs are used instead of using mechanical switches to switch the sense resistors. Also, no noise due to switching of the mechanical switch is introduced into the conversion circuit, and a signal other than the power supply circuit is controlled. The high-precision LED driver and the method of driving the LED are suitable for high power output. However, the conversion circuit has a simple layout.
According to an embodiment, the converter circuit comprises an adjustable sensing resistor (R)CS) The adjustable sensing resistor (R)CS) Having at least three sense resistances (R)CS 1、RCS 2、RCS n) At least two mechanical switches and at least two MOSFETs.
According to an embodiment of the method according to the present invention,the method comprises at least three sense resistances (R) arranged in parallel by controlling the gates of at least two MOSFETs by means of at least two mechanical switchesCS 1..RCS n) At least two sense resistances (R) ofCS 1、RCS 2) And an adjustable sensing resistor (R)CS) Is switched in parallel to the remaining sense resistor (R)CS n) Or disconnect it.
Adjustable sensing resistor (R)CS) At least two sense resistances (R)CS 1、RCS 2) Each switched by one of the at least two MOSFETs. A MOSFET arranged in series to a corresponding sense resistor (R)CS 1、RCS 2). The at least two MOSFETs are each controlled by one of the at least two mechanical switches. The mechanical switches are each connected to the gate of a respective one of the MOSFETs. The voltage switching the at least two MOSFETs is provided to the gate through a mechanical switch. At least two sensing resistances (R)CS 1、RCS 2) Can be switched to be connected in parallel to the rest of the sensing resistors (R) respectively by opening or closing the mechanical switchesCS n) Or off and thus control the conductivity of the respective MOSFET.
The more sense resistance (R)CS 1、RCS 2) The more different currents and voltages can be supplied to the LEDs, which can be switched by means of series MOSFETs with corresponding mechanical switches.
According to another embodiment, the converter circuit includes an Integrated Circuit (IC) controller. The IC controller is configured to control an input current (I)IN、AC) And input voltage (U)IN、AC) Conversion to output current (I)OUT、DC) And an output voltage (U)OUT、DC)。
According to another embodiment, the method comprises controlling the input current (I) by means of an IC controllerIN、AC) And input voltage (U)IN、AC) Conversion to output current (I)OUT、DC) And an output voltage (U)OUT、DC)。
IC controllers for LED drivers are well known in the art and need no further disclosure here. The known IC controller is capable of controlling the converter circuit of the LED driver robustly and accurately.
According to another embodiment, the converter circuit is a buck converter.
According to another embodiment, the current (I) is inputIN、AC) And input voltage (U)IN、AC) Conversion to output current (I)OUT、DC) And an output voltage (U)OUT、DC) Is achieved by means of a pressure reducing converter.
The buck converter (buck converter) is a direct current-to-direct current power converter (DC-to-DC powerconverter) that can step up an input current while stepping down an input voltage. It is a class of Switched Mode Power Supplies (SMPS) comprising at least two semiconductors (one diode and one transistor, although modern buck converters often replace the diode with a second transistor for synchronous rectification) and at least one energy storage element (capacitor, inductor or a combination thereof). To reduce voltage ripple, a filter consisting of a capacitor (optionally in combination with an inductor) is added to the output (load side filter) and input (supply side filter) of the buck converter.
The buck converter provides higher power efficiency as a dc-dc converter than a linear regulator. Linear regulators are simpler circuits that reduce voltage by dissipating power with heat, but do not increase output current. The buck converter is very efficient (up to 90% efficiency).
According to another embodiment, the at least one mechanical switch is a dual in-line package (DIP) switch.
DIP switches are manual electrical switches that are assembled with others in standard dual in-line packages. This type of switch is designed to be used on a printed circuit board together with other electronic components of the conversion circuit.
DIP switches change faster than, for example, jumper blocks, and no components are lost.
According to another embodiment, the high precision LED driver comprises a rectifier. The rectifier is configured to convert into an output current (I)IN、DC) And output electricityPressing (U)IN、DC) Before, an alternating current is input into the current (I)IN、AC) And an alternating input voltage (U)IN、AC) Rectified to direct current input current (I)IN、DC) And a DC input voltage (U)IN、DC)。
According to another embodiment, the method further comprises the step of converting to an output current (I)OUT、DC) And an output voltage (U)OUT、DC) Before, an alternating current is input into the current (I)IN、AC) And an alternating input voltage (U)IN、AC) Rectified to direct current input current (I)IN、DC) And a DC input voltage (U)IN、DC)。
Especially when a dc-dc converter like a buck converter is used for converting to an output current (I)OUT、DC) And an output voltage (U)OUT、DC) Time, alternating input current (I)IN、AC) And an alternating input voltage (U)IN、AC) Must be converted into a direct current input current (I)IN、DC) And a DC input voltage (U)IN、DC). This conversion may be achieved by vacuum tube diodes, mercury arc valves, stacks of copper and selenium oxide plates, semiconductor diodes, silicon controlled rectifiers, and other silicon based semiconductor switches.
These aspects and embodiments and improvements are described in more detail later with the aid of exemplary embodiments shown in the figures. The exemplary embodiments are for better understanding only and should not be construed as limiting in any way.
Drawings
Fig. 1 schematically shows a high precision LED driver.
Fig. 2 schematically shows an IC controller, DIP switches, MOSFETs and sense resistors of the high precision LED driver of fig. 1.
Fig. 3 schematically shows the interconnection of the DIP switches, MOSFETs and sense resistors of the high precision LED driver of fig. 1.
Fig. 4 schematically shows a flow chart of a method of driving an LED.
Fig. 5 schematically shows a comparison of switching noise.
Detailed Description
Throughout the drawings, identical or similar elements and features are denoted by identical reference numerals.
A high precision LED driver 1 is schematically depicted in fig. 1. The high precision LED driver 1 is connected to the LED 2. The converter circuit 3 of the high-precision LED driver 1 is supplied with power via a rectifier 4. The converter circuit 3 is a buck converter and comprises an adjustable sense resistor RCSAnd an adjustable sense resistor R from the port CSCSAnd a powered IC controller 5.
The rectifier 4 inputs AC into current IIN、ACAnd an AC input voltage UIN、ACRectified to DC input current IIN、DCAnd a DC input voltage UIN、DC. The DC input current IIN、DCAnd a DC input voltage UIN、DCIs supplied to the IC controller 5. According to an adjustable sensing resistance RCSVia the converter circuit 3, to supply a corresponding dc output current I to the LED 2OUT、DCAnd a corresponding DC output voltage UOUT、DC。
IC controllers for LED drivers are well known in the art and need no further disclosure here. The known IC controller is capable of controlling the converter circuit of the LED driver robustly and accurately.
In fig. 2 is schematically depicted the IC controller 5, the at least one DIP switch 6, the at least one MOSFET7 and the adjustable sense resistor R of the high precision LED driver 1 of fig. 1CSIs sensed by the sense resistor RCS 1、RCS 2、RCS n. The IC controller 5 supplies power to at least one MOSFET7 through its CS port. The at least one MOSFET7 and the sense resistor RCS 1Or RCS 2Are arranged in series. If the at least one MOSFET7 is arranged at the sense resistor RCS 1、RCS 2Before (as shown), MOSEFT 7 is connected to a corresponding sense resistor RCS 1、RCS 2Of the substrate. If the at least one MOSFET7 is arranged at the sense resistor RCS 1、RCS 2Thereafter (not shown), the MOSEFT 7 is connected to a corresponding sense resistor RCS 1、RCS 2Of the substrate. At least one DIP switch 6 is connected to the gate of at least one MOSFET7 and to ground. The at least one MOSFET7 is provided with a drive signal A at its gate, wherein the drive signal A has a threshold voltage U equal to or higher than the at least one MOSFET7THIs sufficient to enable or disable the conductivity between its source and drain of the respective MOSFET7, depending on the type (n-type or p-type) of the respective MOSFET7.
By means of the DIP switch 6, the drive signal a at the gate of the at least one MOSFET7 can be controlled, so that the conductivity between its source and drain of the respective MOSFET7 can be controlled.
At least one DIP switch 6, at least one MOSFET7 and a sense resistor R of the high precision LED driver 1 of fig. 1 are schematically depicted in fig. 3CSIs sensed by the sense resistor RCS 1、RCS 2、RCS nAre connected to each other. The two MOSFETs 7.1, 7.2 are here connected to three sense resistors R, respectivelyCS 1、RCS 2、RCS nOne of them. The drain of the MOSFET7.1 is connected to a sense resistor RCS 1. The drain of the MOSFET7.2 is connected to a sense resistor RCS 2. Sources of the two MOSFETs 7.1, 7.2 and a third sense resistor RCS nIs connected to the IC controller 5 (not shown) and is powered by the CS port of the IC controller 5. The gates of the two MOSFETs 7.1, 7.2 are provided with a drive signal a sufficient to control the conductivity of the respective MOSFET7.1, 7.2 between its source and drain. The DIP switch 6.1 is connected to the gate of the MOSFET7.1 and to ground. The DIP switch 6.2 is connected to the gate of the MOSFET7.2 and to ground.
By opening or closing the two DIP switches 6.1, 6.2, the conductivity of the respective MOSFET7.1, 7.2 can be controlled. Thus two sense resistors RCS 1、RCS 2Can be switched to be connected in parallel to the sensing resistor RCSThe remaining sense resistor RCS nOr disconnected. Thus, the adjustable sense resistor R can be adjustedCSThe resistance value of (2). When the DIP switch 6.1 is closed (on) and the DIP switch 6.2 is open (off)Then MOSFET7.1 is non-conductive (off) and MOSFET7.2 is conductive (on), so that the sense resistance R isCS 1Disconnect and adjustable sense resistor RCSBy a sense resistor RCS 2And a sense resistor RCS nAre connected in parallel. When the DIP switch 6.2 is closed (conducting) and the DIP switch 6.1 is open (open), then the MOSFET7.2 is non-conductive (open) and the MOSFET7.1 is conductive (conducting), so that the sense resistance R isCS 2By a sense resistor RCS 1And a sense resistor RCS nParallel sensing resistor RCS 2And (4) forming. When the DIP switch 6.1 is open (off) and the DIP switch 6.2 is open (off), the MOSFET7.1 is conductive (conducting) and the MOSFET7.2 is conductive (conducting), so that the adjustable sensing resistance R isCSBy a sense resistor RCS 1And a sense resistor RCS 2And a sense resistor RCS nAre connected in parallel. When the DIP switch 6.1 is closed (conducting) and the DIP switch 6.2 is closed (conducting), then the MOSFET7.1 is non-conductive (open) and the MOSFET7.2 is non-conductive (open), so that the adjustable sense resistor R isCSBy a sense resistor RCS nAnd (4) forming.
A flow chart of a method 10 of driving the LED 2 is schematically shown in fig. 4. The method 10 includes inputting an alternating current I into a current IIN、ACAnd an AC input voltage UIN、ACRectifying 11 to DC input current IIN、DCAnd a DC input voltage UIN、DC. Furthermore, the method 10 comprises inputting a direct current I into the current IIN、DCAnd a DC input voltage UIN、DCConverted 12 into a corresponding direct output current I for the LED 2OUT、DCAnd a corresponding DC output voltage UOUT、DC. Method 10 includes controlling 13, by IC controller 5, converting 12. Switching 12 includes switching two sense resistors RCS 1、RCS 2Switch 14 to the third sense resistor RCS nParallel or disconnect it. The three sense resistors RCS 1、RCS 2、RCS nIs an adjustable sensing resistor RCSA part of (a). The switching 14 is effected by controlling 15 the respective gates of the two MOSFETs 7.1, 7.2, the respective gates of the two MOSFETs 7.1, 7.2 being connected in series to two sense resistors R by at least two mechanical switches 6.1, 6.2CS 1、RCS 2One of them.
For example, an LED driver utilizes a mechanical switch for switching the sensing resistance of an adjustable sensing resistance in parallel or off, which will reduce the dc output current I provided to the LED over timeOUT.DCAnd reducing the amount of switching operations by up to about 11%. In contrast, the high-precision LED driver 1 and the method 10 for driving LEDs provide a direct output current IOUT、DCThere is only about a 2% reduction in time and amount of switching operations.
Furthermore, as schematically depicted in fig. 5, the high precision LED driver 1 and the method 10 for driving LEDs introduce significantly less switching noise (peak 20.1) compared to LED drivers that utilize DIP switches to switch the sense resistance (peak 20.2).
Claims (12)
1. High-precision light emitting diode, LED, driver (1) comprising:
a converter circuit (3) configured to convert an input current (I)IN、AC) And input voltage (U)IN、AC) Conversion into an output current (I) for the LED (2)OUT、DC) And an output voltage (U)OUT、DC). The converter circuit (3) comprises:
adjustable sensing resistor (R)CS) Having at least two sensing resistors (R) arranged in parallelCS 1..RCS n)；
At least one mechanical switch (6.1, 6.2); and
at least one metal oxide semiconductor field effect transistor MOSFET (7.1, 7.2) configured to sense the resistance (R)CS 1、RCS 2) Is switched in parallel to the remaining sensing resistor (R)CS n) Or to switch it off, wherein the gate of the at least one MOSFET (7.1, 7.2) is controlled by the at least one mechanical switch (6.1, 6.2).
2. High precision LED driver (1) as claimed in claim 1, wherein the converter circuit (3) comprises an adjustable sense resistor (R)CS) The adjustable sensing resistance (R)CS) Having at least three sense resistances (R)CS 1、RCS 2、RCS n) At least two mechanical switches (6.1, 6.2) and at least two MOSFETs (7.1, 7.2).
3. High precision LED driver (1) as claimed in claim 1 or 2, wherein the converter circuit (3) comprises an integrated circuit, IC, controller (5), the integrated circuit, IC, controller (5) being configured to control the input current (I)IN、AC) And said input voltage (U)IN、AC) Is converted into the output current (I)OUT、DC) And the output voltage (U)OUT、DC)。
4. A high accuracy LED driver (1) as claimed in any of the preceding claims, wherein the converter circuit (3) is a buck converter.
5. A high precision LED driver (1) according to any of the preceding claims, wherein said at least one mechanical switch is a dual in-line package DIP switch (6.1, 6.2).
6. High precision LED driver (1) according to any of the preceding claims, further comprising a rectifier (4), the rectifier (4) being configured to convert into an output current (I)OUT、DC) And an output voltage (U)OUT、DC) Before, an alternating current is input into the current (I)IN、AC) And an alternating input voltage (U)IN、AC) Rectified to direct current input current (I)IN、DC) And a DC input voltage (U)IN、DC)。
7. Method (10) for driving an LED (2), comprising inputting a current IIN、ACAnd an input voltage UIN、ACConverting (12) into an output current I for the LED (2)OUT、DCAnd an output voltage UOUT、DCComprising at least two sensing resistances (R) arranged in parallel by controlling (15) the gate of at least one MOSFET (7.1, 7.2) by means of at least one mechanical switch (6.1, 6.2)CS 1..RCS n) A sense resistor (R)CS 1、RCS 2) And an adjustable sensing resistor (R)CS) Is switched (14) in parallel to the remaining sense resistor (R)CS n) Or disconnect it.
8. The method (10) as claimed in claim 7, comprising at least three sense resistances (R) arranged in parallel by controlling (15) the gates of at least two MOSFETs (7.1, 7.2) by means of at least two mechanical switches (6.1, 6.2)CS 1..RCS n) At least two sense resistances (R)CS 1、RCS 2) And an adjustable sensing resistor (R)CS) Is switched (14) in parallel to the remaining sense resistor (R)CS n) Or disconnect it.
9. The method (10) as claimed in claim 7 or 8, comprising controlling (13) the input current (I) by an IC controllerIN、AC) And said input voltage (U)IN、AC) Converting (12) into the output current (I)OUT、DC) And the output voltage (U)OUT、DC)。
10. The method (10) according to any one of claims 7 to 9, wherein the input current (I) is realized by means of a buck converterIN、AC) And said inputVoltage (U)IN、AC) Converting (12) into the output current (I)OUT、DC) And the output voltage (U)OUT、DC)。
11. A method (10) according to any of claims 7-10, wherein the at least one mechanical switch is a DIP switch (6.1, 6.2).
12. The method (10) according to any one of claims 7 to 11, further comprising converting to an output current (I)OUT、DC) And an output voltage (U)OUT、DC) Before, an alternating current is input into the current (I)IN、AC) And an alternating input voltage (U)IN、AC) Rectifying (11) to a direct input current (I)IN、DC) And a DC input voltage (U)IN、DC)。
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| CN201811367440.5A CN111278194A (en) | 2018-11-16 | 2018-11-16 | High-precision LED driver |
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| CN201811367440.5A CN111278194A (en) | 2018-11-16 | 2018-11-16 | High-precision LED driver |
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| CN1757153A (en) * | 2003-01-10 | 2006-04-05 | 英特赛尔美国股份有限公司 | Multiphase converter controller using single gain resistor |
| CN103220845A (en) * | 2012-01-20 | 2013-07-24 | 朗捷科技股份有限公司 | Alternating current LED drive circuit capable of adjusting working voltage range |
| CN104853476A (en) * | 2015-02-10 | 2015-08-19 | 深圳市佳比泰电子科技有限公司 | LED dimming circuit and LED lamp |
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2018
- 2018-11-16 CN CN201811367440.5A patent/CN111278194A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1757153A (en) * | 2003-01-10 | 2006-04-05 | 英特赛尔美国股份有限公司 | Multiphase converter controller using single gain resistor |
| CN103220845A (en) * | 2012-01-20 | 2013-07-24 | 朗捷科技股份有限公司 | Alternating current LED drive circuit capable of adjusting working voltage range |
| CN104853476A (en) * | 2015-02-10 | 2015-08-19 | 深圳市佳比泰电子科技有限公司 | LED dimming circuit and LED lamp |
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| PB01 | Publication | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200612 |
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| RJ01 | Rejection of invention patent application after publication |