CN107027218B - LED controls chip and LED light device - Google Patents
LED controls chip and LED light device Download PDFInfo
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- CN107027218B CN107027218B CN201710288863.7A CN201710288863A CN107027218B CN 107027218 B CN107027218 B CN 107027218B CN 201710288863 A CN201710288863 A CN 201710288863A CN 107027218 B CN107027218 B CN 107027218B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/20—Controlling the colour of the light
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Abstract
The present invention relates to LED control chips and LED light devices.LED controls chip：LED current detection circuit is detected the electric current that flows through of LED light group, and exports judging result signal；State-driven circuit determines whether the narrow pulse signal for exporting the open/close state for changing LED light group according to judging result signal；Logical status control circuit, for when receiving narrow pulse signal, going to next logic state from present logic state and exporting corresponding state control signal；Driving circuit, according to the state control signal output LED drive signal received, to control the open/close state of LED light group；Interior power supply circuit for controlling chip power supply for LED, and exports enable signal, for the enable signal as internal circuit when VCC voltages are sufficiently high.Implement the present invention, coordinate without any peripheral circuit and component, required color temperature adjustment control function can be completed in LED control chips.Its circuit structure is succinct, at low cost compared with prior art.
Description
Technical field
The present invention relates to field of LED illumination, and chip and LED light device are controlled more specifically to a kind of LED.
Background technology
With the continuous expansion of LED illumination application range, LED illumination is also from best single illumination functions gradually to intelligence
Change, hommization and energy saving direction development.In order to meet people under different scenes to the requirement of light, has switch color-temperature regulating work(
The LED illumination lamp of energy is come into being.Current existing color-temperature regulating scheme is regardless of using MCU or a kind of existing control chip
The color-temperature regulating scheme of realization, is all extremely complex, and an independent detection circuit is required for examine input switch action
It surveys.Complicated circuit not only causes the cost of driving power to increase, and the volume of driving power can be caused to increase, this is to LED
Popularization be unfavorable.
The present invention reduces the cost of driving power and reduces volume primarily to simplified colour temperature adjusts circui structure, right
For the schemes such as bulb lamp and shot-light, volume and cost are vital.
LED illumination color temperature adjustment scheme is mainly adjusted by remote control or input switch at present, in both technologies,
The cost adjusted by input switch is minimum, and without being transformed to existing circuit, so switch color-temperature regulating side
Case is increasingly received by people.Input switch color-temperature regulating is two that output is controlled by the continuous on and off of input switch
The switch of the LED lamp bead of road different-colour, for example, output has LED (the generally yellow and white of two string different-colours
LED), input switch often switchs once, and the LED light string of conducting will change once, and the turn-on sequence of LED light string can be with input
The on and off circulation change of switch.
The circuit of existing switch color-temperature regulating scheme is as shown in Figure 1, the wherein switch color-temperature regulating control needs of chip 109 pass through
Resistance 105 is detected the positive terminal of diode 108, and then determines the state of input switch 101, and according to input switch
101 state controls the switch of two switching tubes 114 and 116.In addition to this, the power supply foot VCC of control chip 109 still needs to one
A current-limiting resistance 110, and the internal circuit supply pin for controlling chip 109 also needs to an external filter capacitor.Shown in Fig. 1
Circuit in it can be seen that, control chip 109 needs the cooperation of multiple peripheral cells could complete the function of required color-temperature regulating.
The scheme peripheral component of existing input switch color-temperature regulating is numerous, cause LED drive power plate be difficult accomplish it is small
Type, and cost can be caused to increase.
Invention content
The technical problem to be solved in the present invention is, multiple for the control chip needs of the LED illumination lamp of the prior art
The defect that peripheral cell cooperation could realize color temperature adjustment, make small product size big, of high cost provides a kind of LED controls chip
And LED light device.
The technical solution adopted by the present invention to solve the technical problems is：A kind of LED controls chip is constructed, including：
LED current detection circuit 307, for flowing through electric current to coupled the first LED light group and the second LED light group
It is detected, judges disconnection and the closure of LED power supplies switch 201 accordingly, and export judging result signal DL_EN；
State-driven circuit 304 is connect with the LED current detection circuit 307, and according to the judging result signal
DL_EN determines whether to export the narrow pulse signal of the open/close state for changing first LED light group and the second LED light group
STP；
Logical status control circuit 305 is connect with the state-driven circuit 304, and the narrow arteries and veins is received for working as
When rushing signal STP, goes to next logic state from present logic state and export corresponding state control signal S1, S2；
Driving circuit 308 is connect with the logical status control circuit 305, for according to the state received
Control signal S1, S2 and export LED drive signal DR1, DR2, to control the opening of first LED light group and the second LED light group/
Off status；And
Interior power supply circuit 306 for controlling chip power supply for the LED, and is exported when VCC voltages are sufficiently high and is enabled
Signal EN, for the enable signal as internal circuit.
In LED of the present invention controls chip, the interior power supply circuit (306) includes capacitor discharging circuit, is used
In when judging that LED power supplies switch 201 turns off, be externally connected on LED control chip VCC pins and GND pins it
Between energy storage filter capacitor 209 discharge.
In LED of the present invention controls chip,
Judging result signal DL_EN high level and low level respectively represent disconnection and the closure of input switch 201；Its
In,
It is described when detecting that the electric current for flowing through first LED light group and the second LED light group is respectively less than predetermined threshold
LED current detection circuit 307 judges that power switch 201 disconnects, and exports the high level for representing the disconnection of power input switch 201；
Otherwise output represents the low level of the closure of power input switch 201.
In LED of the present invention controls chip,
The state-driven circuit 304 includes delay circuit, to receive the high level for representing the disconnection of input switch 201
Judging result signal DL_EN during, export the narrow pulse signal STP after confirming high level delay predetermined time Tdl, with
Filter out noise.
In LED of the present invention controls chip,
The LED controls chip includes for according to described in the enable signal EN and the first LED drive signal DR1 controls
First LED switch circuit of the high/low ON/OFF to control first LED light group of level of L1 feet, and according to described
Level that enable signal EN and the second LED drive signal DR2 controls the L2 feet is high/low, to control second LED light group
ON/OFF the second LED switch circuit；And
The LED current detection circuit 307 includes for respectively to the stream of first LED light group and the second LED light group
The first detection circuit and the second detection circuit being detected through electric current, wherein the input terminal of first detection circuit with it is described
LED controls the L1 feet connection of chip, and the input terminal of second detection circuit is connect with the L2 feet of LED control chips.
In LED of the present invention controls chip,
The first LED switch circuit includes：First with door 517 and the first MOSFET 516, wherein described first
The drain electrode of MOSFET 516 connect with the L1 feet, the connection of source electrode and GND feet, grid and described first and the output end of door 517
Connection；Described first connect with the first input end of door 517 with 306 output end of the interior power supply circuit to receive described enable
Signal EN, described first connect with the second input terminal of door 517 with the first output end of the driving circuit 308 it is described to receive
First LED drive signal DR1；
The second LED switch circuit includes：Second with door 518 and the 2nd MOSFET 519, wherein described second
The drain electrode of MOSFET 519 connect with the L2 feet, the connection of source electrode and GND feet, grid and described second and the output end of door 518
Connection；Described second connect with the first input end of door 518 with 306 output end of the interior power supply circuit to receive described enable
Signal EN, described second connect with the second input terminal of door 518 with the second output terminal of the driving circuit 308 it is described to receive
Second LED drive signal DR2.
In LED of the present invention controls chip,
First detection circuit includes：
The first p-type MOSFET 500, the second p-type MOSFET 501, the first N-type MOSFET 508, the 2nd N being sequentially connected in series
Type MOSFET 509 and first resistor 515 and biasing circuit, and the connection section of the second N-type MOSFET 509 and first resistor 515
Point is connected to the source electrode of the first MOSFET 516, the grid and first of the 3rd MOSFET 514 by the 3rd MOSFET 514
The grid of MOSFET 516 is connected；
Second detection circuit includes：
Third p-type MOSFET 502, the 4th p-type MOSFET 503, third N-type MOSFET 510, the 4th N being sequentially connected in series
Type MOSFET 511 and second resistance 521 and biasing circuit, and the 4th N-type MOSFET 511 and second resistance (521 connection
Node is connected to the source electrode of the 2nd MOSFET 519, the grid and second of the 4th MOSFET 520 by the 4th MOSFET 520
The grid of MOSFET 519 is connected；
Wherein,
The connecting node of second p-type MOSFET 501 and the first N-type MOSFET 508, the 4th p-type MOSFET 503 and
The connecting node of three N-type MOSFET 510 is separately connected the first input end and the second input terminal of nor gate 523, the nor gate
523 output end is the output end of judging result signal DL_EN.
In LED of the present invention controls chip,
The LED current detection circuit 307 includes for being the first p-type MOSFET 500, the second p-type MOSFET
501, the first N-type MOSFET 508, the second N-type MOSFET 509, third p-type MOSFET 502, the 4th p-type MOSFET 503,
Third N-type MOSFET 510 and the 4th N-type MOSFET 511 provide the biasing circuit of bias voltage, and the biasing circuit includes inclined
Set resistance (522)；And
The first resistor 515 is equal with the resistance value of second resistance 521 and is less than the resistance value of the biasing resistor 522.
The technical solution adopted by the present invention to solve the technical problems is：Construct a kind of LED light device, including flyback perseverance
Galvanic electricity source and the first LED light group connected to it, the second LED light group, which is characterized in that further include LED controls as described above
Chip is connected between the output end of flyback constant-current supply and the switch control terminal of the LED light group.
In LED light device of the present invention, the VCC feet of the LED controls chip are exported with flyback constant-current supply
The anode at end is connected, and GND feet are connected with the cathode of flyback constant-current supply output end, L1 feet and L2 feet respectively with the first LED light group
It is connected with the cathode of the second LED light group.
Implement the present invention, has the advantages that：LED using the present invention controls chip, is not necessarily to any peripheral circuit
And required color temperature adjustment control function can be completed in component cooperation, LED light device.Its circuit structure compared with prior art
More succinctly, cost is lower.And the size of entire control circuit is small, so that the volume of LED light device can be done
Smaller.
Description of the drawings
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing：
It is the circuit diagram of the switch toning circuit temperature of the prior art shown in Fig. 1；
It is the circuit diagram of the LED light device of the switchable color-temperature regulating of the present invention shown in Fig. 2；
It is the internal circuit block diagram of the LED control chips of the present invention shown in Fig. 3；
It is the schematic diagram of interior power supply circuit in LED controls chip according to an embodiment of the invention shown in Fig. 4；
It is the schematic diagram of LED current detection circuit in LED controls chip according to an embodiment of the invention shown in Fig. 5；
It is the schematic diagram of state-driven circuit in LED controls chip according to an embodiment of the invention shown in Fig. 6 A；
Fig. 6 B are the oscillograms of each signal in state-driven circuit shown in Fig. 6 A；
It is the schematic diagram of logical status control circuit in LED controls chip according to an embodiment of the invention shown in Fig. 7 A；
Fig. 7 B are the oscillograms of each signal in logical status control circuit shown in Fig. 7 A；
It is the schematic diagram of LED controls Driver Circuit according to an embodiment of the invention shown in Fig. 8 A；
Fig. 8 B are the oscillograms of each signal in driving circuit shown in Fig. 8 A.
Specific implementation mode
The present invention proposes a kind of completely new LED color temperature adjustments scheme (as shown in Figure 2), and in the program, LED controls chip
208 are directly connected to the output end of flyback constant-current supply, which includes control chip 204, switching tube 205, becomes
Depressor 203, output rectifier diode 207 and current sampling resistor 206.The input terminal of transformer 203 in flyback constant-current supply
It is connect with AC power 200 by filter circuit 202, power input switch 201.Scheme proposed by the present invention is compared with existing scheme
Difference is to be not necessarily to any peripheral component, and LED of the invention controls chip 208 there are four foot position, and wherein VCC feet are directly and flyback
The anode of the output end of constant-current supply is connected, and GND feet are connected with the cathode of the output end of flyback constant-current supply, L2 points of foot L1 and foot
It is not connected with the cathode of the first LED light group 210 and the second LED light group 210.Capacitance 209 is used as energy storage and filtering.
The solution of the present invention is by being detected the electric current for flowing through LED light group 210 and 211, to judge power input
The on off state of switch 201 passes through LED light group 210 because constant-current supply will be stopped after input switch 201 disconnects
It will be reduced rapidly with 211 electric current until electric current is reduced to zero.LED has controlled built in inside the L1 feet and L2 feet of chip 208 one
A LED current detection circuit is detected LED current, and when detecting LED current less than given threshold, LED controls chip 208
It is assumed that power input switch 201 is already off.
LED controls the internal frame diagram of chip 208 as shown in figure 3, including LED current detection circuit 307, interior power supply circuit
306, state-driven circuit 304, logical status control circuit 305 and driving circuit 308.
Wherein, LED current detection circuit (307) is used for the first coupled LED light group 210 and the second LED light group
211 electric current that flows through is detected, and judges disconnection and the closure of LED power supplies switch 201 accordingly, and exports judging result letter
Number DL_EN；
State-driven circuit 304 is connect with the LED current detection circuit 307, and according to the judging result signal DL_
EN determines whether to export the burst pulse letter for changing the open/close state of first LED light group, 210 and second LED light group 211
Number STP；
Logical status control circuit 305 is connect with the state-driven circuit 304, and the burst pulse letter is received for working as
When number STP, goes to next logic state from present logic state and export corresponding state control signal S1, S2；
Driving circuit 308 is connect with the logical status control circuit 305, for according to the state control received
Signal S1, S2 export LED drive signal DR1, DR2, to control the ON/OFF shape of first LED light group and the second LED light group
State；And
Interior power supply circuit 306 is used to control chip 208 for the LED and power, and when VCC voltages are sufficiently high
(when reaching scheduled voltage) output enable signal EN, for the enable signal as internal circuit.Wherein, internal circuit packet
Include LED current detection circuit 307, state-driven circuit 304, logical status control circuit 305 and driving circuit 308 and LED controls
Other internal circuits in coremaking piece 208.
More specifically, LED current detection circuit 307 passes through L1 feet and L2 the feet cathode with LED light group 210 and 211 respectively
It is connected, the judging result signal DL_EN of the circuit output is input to interior power supply circuit 306 and state-driven circuit 304 in addition
First input port.First input signal EN of LED current detection circuit 307 is the enabled of the output of interior power supply circuit 306
Signal, the second input signal DR1 and DR2 are the LED drive signal that driving circuit 308 exports.The first of state-driven circuit 304
It is respectively enable signal EN and judging result signal DL_EN with the second input signal, the narrow pulse signal STP of output is input to
The input terminal of logical status control circuit 305,305 output end of circuit is connected with the input terminal of driving circuit 308, for sending shape
State controls signal S1 and S2 to driving circuit 308.
LED controls the operation principle of chip 208：By LED current detection circuit 307 to flowing through LED light group 210 and 211
Electric current be detected, when the electric current is more than predetermined threshold, LED controls chip 208 and judges 201 closure of power input switch,
And when the electric current is less than predetermined threshold, LED controls chip 208 and judges that power input switch 201 is already off.The present invention's
In one embodiment, the judging result signal DL_EN that LED current detection circuit 307 exports is respectively represented with high level and low level
The disconnection of power input switch 201 and closure.That is, flowing through first LED light group, 210 and second LED light group 211 when detecting
Electric current when being respectively less than predetermined threshold, LED current detection circuit 307 judges 201 disconnection of power input switch, and exports and represent electricity
The high level that source input switch 201 disconnects；Otherwise output represents the low level of the closure of power input switch 201.
Judging result signal DL_EN is input in state-driven circuit 304, and the circuit 304 is to judging result signal DL_EN
Postponed to avoid malfunctioning to filter out noise, and generates a narrow pulse signal STP, the arteries and veins at signal DL_EN rising edges
Input signal of the signal as logical status control circuit 305 is rushed, a burst pulse, logical status control circuit 305 often occurs
Internal logic state will jump to next logic state, the logic state control signal S1 of logical status control circuit 305
It is input to driving circuit 308 with S2, and generates two LED drive signals DR1 and DR2, for the grid to internal switching tube
It is controlled, is particularly described below.
The circuit that Fig. 5 show the LED current detection circuit 307 in LED controls chip 208 in one embodiment of the invention shows
It is intended to.
LED control chips 208 include for according to described in the enable signal EN and the first LED drive signal DR1 controls
First LED switch circuit of the high/low ON/OFF to control first LED light group of level of L1 feet, and according to described
Level that enable signal EN and the second LED drive signal DR2 controls the L2 feet is high/low, to control second LED light group
ON/OFF the second LED switch circuit.
In the embodiment as shown in fig.5,
Above-mentioned first LED switch circuit includes：First with door 517 and the first MOSFET 516, wherein described first
The drain electrode of MOSFET 516 connect with the L1 feet, the connection of source electrode and GND feet, grid and described first and the output end of door 517
Connection；Described first connect with the first input end of door 517 with 306 output end of the interior power supply circuit to receive described enable
Signal EN, described first connect with the second input terminal of door 517 with the first output end of the driving circuit 308 it is described to receive
First LED drive signal DR1；
Above-mentioned second LED switch circuit includes：Second with door 518 and the 2nd MOSFET 519, wherein described second
The drain electrode of MOSFET 519 connect with the L2 feet, the connection of source electrode and GND feet, grid and described second and the output end of door 518
Connection；Described second connect with the first input end of door 518 with 306 output end of the interior power supply circuit to receive described enable
Signal EN, described second connect with the second input terminal of door 518 with the second output terminal of the driving circuit 308 it is described to receive
Second LED drive signal DR2.
In the embodiment shown in fig. 5, LED current detection circuit 307 further includes for being the first p-type MOSFET
500, the second p-type MOSFET 501, the first N-type MOSFET 508, the second N-type MOSFET 509, third p-type MOSFET 502,
4th p-type MOSFET 503, third N-type MOSFET 510 and the 4th N-type MOSFET 511 provide the biasing circuit of bias voltage,
The biasing circuit includes biasing resistor 522；And the first resistor 515 is equal with the resistance value of second resistance 521 and is less than institute
State the resistance value of biasing resistor 522.
In the LED control chips of the present invention, LED current detection circuit 307 includes for respectively to first LED light group
The first detection circuit and the second detection circuit that electric current is detected are flowed through with the second LED light group, wherein first detection
The L1 feet that the input terminal of circuit controls chip with the LED are connect, and input terminal and the LED of second detection circuit are controlled
The L2 feet of chip connect.
In the embodiment shown in fig. 5, first detection circuit includes：
The first p-type MOSFET 500, the second p-type MOSFET 501, the first N-type MOSFET 508, the 2nd N being sequentially connected in series
Type MOSFET 509 and first resistor 515 and biasing circuit, and the connection section of the second N-type MOSFET 509 and first resistor 515
Point is connected to the source electrode of the first MOSFET 516, the grid and first of the 3rd MOSFET 514 by the 3rd MOSFET 514
The grid of MOSFET 516 is connected.Second detection circuit includes：The third p-type MOSFET 502 that is sequentially connected in series, the 4th p-type
MOSFET 503, third N-type MOSFET 510, the 4th N-type MOSFET 511 and second resistance 521 and biasing circuit, and the 4th
The connecting node of N-type MOSFET 511 and second resistance 521 is connected to the 2nd MOSFET's 519 by the 4th MOSFET 520
The grid of source electrode, the 4th MOSFET 520 is connected with the grid of the 2nd MOSFET 519.Wherein, 501 Hes of the second p-type MOSFET
The connecting node of the connecting node of first N-type MOSFET 508, the 4th p-type MOSFET 503 and third N-type MOSFET 510 point
Not Lian Jie nor gate 523 first input end and the second input terminal, the output end of the nor gate 523 is judging result signal
The output end of DL_EN.
In more detail, in Fig. 5, the drain electrode of MOSFET 516 and MOSFET 519 are connected with L1 feet and L2 feet respectively, i.e., with
LED light group 210 is connected with 211 cathode, the switch for controlling the two LED light groups, when some MOSFET therein is connected
When, corresponding LED can then be lighted, and otherwise LED is closed.When MOSFET 516 or 519 is connected, corresponding LED current
The MOSFET that conducting will be flowed through, since MOSFET is operated in linear zone, there are certain conducting resistances, can be when electric current flows through
There are voltage differences between the drain electrode and source electrode of MOSFET.Drain electrode and source electrode of the detection circuit to MOSFET 516 and 519 in Fig. 5
Between voltage difference be detected, when the voltage difference is more than threshold value set in advance, circuit thinks there is the electricity for flowing through LED
Stream namely power input switch 201 are closed, and power supply is in running order；And when MOSFET 516 and 519 drain electrode and source electrode it
Between voltage difference when being less than threshold value set in advance, circuit thinks that the electric current for flowing through LED has been switched off namely power input is opened
Close 201 already off, power supply is stopped.For MOSFET 516 source-drain voltage difference detection circuit by p-type MOSFET
500 and 501, N-type MOSFET 508 and 509 and resistance 515 form, wherein MOSFET 500 and 501 series connection, electric after series connection
Road one end is connected with power vd D, and one end after other end is connected with MOSFET 508 and 509 is connected, and AND OR NOT gate 523
One input terminal is connected, and the other end after MOSFET 508 and 509 connects is connected with resistance 515, and passes through N-type MOSFET 514
It is connected with the drain electrode of MOSFET 516, the other end ground connection of resistance 515.The grid of MOSFET 514 and 516 be connected and with
The output end of door 517 is connected, and input signal DR1 and EN with door 517 are respectively LED drive signal and enable signal.From Fig. 5
As can be seen that detection circuit corresponding with MOSFET 519 is by p-type MOSFET 502 and 503, N-type MOSFET 510 and 511, electricity
Hinder 521 and MOSFET 520 form, connection type with the detection circuit of MOSFET 516 as, operation principle be also as,
Details are not described herein.The grid of MOSFET 500,501,508 and 509 is connected with biasing circuit, for ensureing that MOSFET is operated in
Correct workspace, biasing circuit is by p-type MOSFET 504,505,506 and 507, N-type MOSFET 512 and 513 and resistance
522 compositions.Wherein, the size of p-type MOSFET 500,502 and 504 is equal, the ruler of p-type MOSFET 501,503 and 505
Very little equal in magnitude, the size of N-type MOSFET 508,510 and 512 is equal, the size of N-type MOSFET 509,511 and 513
Equal in magnitude, resistance 515 is equal with the resistance value of resistance 521 and is less than the resistance value of resistance 522.
When drive signal DR1 is 0, MOSFET 514 and 516 is closed, since resistance 515 is less than the electricity in biasing circuit
Resistance 522, so the Vgs voltages of MOSFET 509 are more than the Vgs voltages of the MOSFET 513 in biasing circuit, namely by MOSFET
The electric current of the equivalent current source of 508 and 509 compositions is more than the electric current by the equivalent current sources formed of MOSFET 500 and 501, institute
Using the output end OUT1 of detection circuit as low level.When drive signal DR1 is 1, i.e. the conductings of MOSFET514 and 516, LED
210 electric current flows through MOSFET 516, which generates voltage difference Vds between the hourglass source electrode of MOSFET 516, and the voltage is logical
The source electrode that MOSFET 514 is applied to MOSFET 509 is crossed, when Vds is more than the voltage at 522 both ends of resistance in biasing circuit,
The Vgs voltages of MOSFET 509 are less than the Vgs voltages of MOSFET 513, namely the equivalent electricity being made of MOSFET 508 and 509
The electric current in stream source is less than the electric current by the equivalent current sources formed of MOSFET 500 and 501, so the output end of detection circuit
OUT1 is high level.After power input switch 201 disconnects, the electric current of LED 210 is reduced rapidly, the hourglass source electrode of MOSFET 516
Voltage can also reduce therewith, and when the voltage is less than the voltage at 522 both ends of resistance namely the Vgs voltages of MOSFET 509 are more than
The Vgs voltages of MOSFET 513 in biasing circuit, namely it is big by the electric current of the equivalent current sources formed of MOSFET 508 and 509
In the electric current for the equivalent current source being made of MOSFET 500 and 501, so the output end OUT1 of detection circuit is low level.Such as
When the electric current of fruit LED 210 and 211 is all 0, the output end OUT1 of two detection circuits in LED current detection circuit 307 and
OUT2 is 0, and the output signal DL_EN of circuit 307 is 1 (exporting high level).
Judging result signal DL_EN is input in state-driven circuit 304, and the signal is as state-driven circuit 304
The internal circuit schematic diagram of enable signal, state-driven circuit 304 is as shown in Figure 6A.The circuit is by oscillating circuit 600 and D
Trigger 601 to 604 (for realizing delay) and narrow-pulse generation circuit 605 form.When DL_EN is 0 (low level), shake
It swings circuit 600 and d type flip flop is all reset, and when DL_EN is 1 (high level), oscillating circuit 600 is started to work, and is exported
One fixed square wave of frequency, the square wave are input to by d type flip flop group divider.It can be seen that and work as from the waveform in Fig. 6 B
Signal DL_EN 606 after low level becomes high level and has crossed one section of delay time Tdl, logical status control circuit 305
Input signal DL 607 becomes high level from low level, which is input in narrow-pulse generation circuit 605, and circuit 605 exports
One narrow pulse signal STP 608, and it is input to logical status control circuit 305.
Logical status control circuit 305 is used for logic states, and as shown in Figure 7 A, which is mainly triggered by two D
Device 700 and 701 and NAND gate 702 form.The state control signal S1 and S2 of the circuit output are input to driving circuit 308
In, the CLK feet of d type flip flop 700 are connected with narrow pulse signal STP inputs, resetting pin and the NAND gate 702 of two d type flip flops
Output end is connected, and two input terminals of NAND gate are connected with state control signal S1 and S2 input respectively.The operating wave of the circuit
As shown in fig.7b, S1 704 and 705 original states of S2 are respectively 0 and 0 to shape, when first pulse of STP 703 occurs,
S1 and S2 enters second state S1=1 and S2=0, and when second pulse of STP 703 occurs, S1 and S2 enter third shape
State S1=0 and S2=1, when the third pulse of STP 703 occurs, S1 and S2 return to initial state, i.e. S1=0 and S2=0.
State control signal S1 and S2 are input in driving circuit 308.
The circuit diagram of driving circuit 308 is as shown in Figure 8 A, and state control signal S1 generates LED drivings behind the door by non-
Signal DR1, and DR2 non-is generated by nor gate and behind the door by state control signal S1 and S2.What driving circuit 308 exported
The waveform of state control signal S1 and S2 are as shown in Figure 8 B, original state DR1=1, DR2=0, when the pulse of STP 803 occurs
When, DR1 and DR2 enter second state, i.e. DR1=0 and DR2=1, when the pulse of STP803 occurs again, DR1 and DR2
Into third state, i.e. DR1=1 and DR2=1, DR1 and DR2 has completed a cycle at this time, if 803 STP at this time
When pulse occurs again, DR1 and DR2 are returned to original state.LED drive signal DR1 and DR2 are input to LED current detection electricity
In road 307, is controlled for the grid to the switching tube 516 and 519 being connected respectively with L1 feet and L2 feet, that is, work as DR1=1
When, switching tube 516 is connected, and the LED 210 being attached thereto is lighted, and as DR1=0, switching tube 516 turns off, and is attached thereto
LED 210 is closed.And so on, the logic state of LED 210 and LED 211 are：Under first state (i.e. original state),
LED 210 is lighted, and LED 211 is closed, and under the second state, LED 210 is closed, and LED 211 is lighted, under third state, LED
210 and 211 are all lit.
Due to LED voltage-current characteristic and diode-like seemingly, when the electric current of LED is reduced to 0, but capacitance 209 is at this time
Voltage it is still very high because LED current has been reduced to 0, the voltage on capacitance 209 can not release, if in capacitance 209
State conversion is carried out in the case that voltage is very high and be easy to cause LED flickers, so must be rapid when LED current is reduced to 0
Energy on capacitance 209 is bled off.To solve this problem, built-in in 306 embodiment of interior power supply circuit shown in Fig. 4
Capacitor discharging circuit, for when judging LED power supplies switch (201) shutdown, being externally connected on the LED controls chip
Energy storage filter capacitor 209 between VCC pins and GND pins discharges.The effect of interior power supply circuit 306 is in LED electricity
When current detection circuit 307 detects that LED 210 and 211 electric currents are reduced to 0, run through in interior power supply circuit 306
The voltage pull-down of capacitance 209 to the voltage of setting, the voltage is sufficiently low, is not in above for MOSFET401 and resistance 400
The problem.According to Fig. 5, so, when LED 210 and 211 electric currents are reduced to 0, output signal DL_EN is high level, the level
It is input in interior power supply circuit 306.When signal DL_EN is low level, switch 405 disconnects, and switch 408 is closed, therefore
The grid voltage of MOSFET 401 turns off for 0, MOSFET 401.And when signal DL_EN is high level, switch 405 is closed, and
Switch 408 disconnects, and the grid of MOSFET 401 is connected with one end of resistance 409, when VCC voltages (namely voltage of capacitance 209)
When sufficiently high, the grid voltage of MOSFET 401 is higher than threshold value, the MOSFET 401 conductings, so VCC voltages can pass through electricity
Resistance 400 discharges into ground.
The present invention proposes that a kind of unique electric current detecting method, this method pass through without increasing current sense resistor
The electric current passed through is detected using the conducting resistance of switching tube itself, because of depositing due to conducting resistance when electric current passes through switching tube
A voltage difference, the size direct relation of the voltage difference and electric current will necessarily be being generated at the both ends of switching tube, the present invention proposes
Electric current detecting method be exactly the voltage swing by detection switch pipe both ends to judge the presence or absence of electric current.By to LED electricity
The detection of stream is to judge the action of input switch, and according to the logic shape inside the continuous circulation change of action of input switch
State.
Based on above-mentioned electric current detecting method, the present invention proposes a kind of logic control method of double-colored temperature LED light：Including as follows
Step：
Two paths of LED electric current is measured in real time by LED current detection circuit；
When the electric current for detecting two paths of LED is all 0, LED current detection circuit exports a signal DL_EN；
The signal generates a pulse signal after the delay time of a setting；
The pulse signal is input to the logic state for changing chip interior in logical status control circuit；
Logic state signal generates two LED drive signals DR1 and DR2 after overdrive circuit and is respectively used to control LED
Switching tube in current detection circuit, to control the bright of two paths of LED respectively or put out.
Above example only technical concepts and features to illustrate the invention, its object is to allow person skilled in the art
Scholar can understand present disclosure and implement accordingly, can not limit the scope of the invention.It is all to be wanted with right of the present invention
The equivalent changes and modifications that range is done are sought, the covering scope of the claims in the present invention should all be belonged to.
Claims (10)
1. a kind of LED controls chip, which is characterized in that including：
LED current detection circuit (307), for coupled the first LED light group and the second LED light group flow through electric current into
Row detection, judges disconnection and the closure of LED power supplies switch (201) accordingly, and exports judging result signal (DL_EN)；
State-driven circuit (304) is connect with the LED current detection circuit (307), and according to the judging result signal
(DL_EN) determine whether to export the burst pulse letter for changing the open/close state of first LED light group and the second LED light group
Number (STP)；
Logical status control circuit (305) is connect with the state-driven circuit (304), and the narrow arteries and veins is received for working as
When rushing signal (STP), goes to next logic state from present logic state and export corresponding state control signal (S1, S2)；
Driving circuit (308) is connect with the logical status control circuit (305), for according to the state received
It controls signal (S1, S2) and exports LED drive signal (DR1, DR2), to control first LED light group and the second LED light group
Open/close state；And
Interior power supply circuit (306) for controlling chip power supply for the LED, and exports enabled letter when VCC voltages are sufficiently high
Number (EN), for the enable signal as internal circuit.
2. LED according to claim 1 controls chip, which is characterized in that
The interior power supply circuit (306) includes capacitor discharging circuit, judges LED power supplies switch (201) shutdown for working as
When, the energy storage filter capacitor (209) being externally connected between the VCC pins and GND pins of the LED controls chip discharges.
3. LED according to claim 1 controls chip, which is characterized in that
Judging result signal (DL_EN) respectively represents disconnection and the closure of input switch (201) with high level and low level；Its
In,
When detecting that the electric current for flowing through first LED light group and the second LED light group is respectively less than predetermined threshold, the LED electricity
Current detection circuit (307) judges that power switch (201) disconnects, and exports and represent the high level that power input switch (201) disconnects；
Otherwise output represents the low level that power input switch (201) is closed.
4. LED according to claim 3 controls chip, which is characterized in that
The state-driven circuit (304) includes delay circuit, to represent the high level of input switch (201) disconnection in reception
Judging result signal (DL_EN) during, confirm high level delay predetermined time (Tdl) export the narrow pulse signal afterwards
(STP), to filter out noise.
5. LED according to claim 3 controls chip, which is characterized in that
The LED controls chip includes for according to described in the enable signal (EN) and the first LED drive signal (DR1) control
LED controls the first LED switch circuit of the high/low ON/OFF to control first LED light group of level of the L1 feet of chip,
And the level that the LED controls the L2 feet of chip is controlled according to the enable signal (EN) and the second LED drive signal (DR2)
Second LED switch circuit of high/low ON/OFF to control second LED light group；And
The LED current detection circuit (307) includes for being flowed through respectively to first LED light group and the second LED light group
The first detection circuit and the second detection circuit that electric current is detected, wherein the input terminal of first detection circuit with it is described
LED controls the L1 feet connection of chip, and the input terminal of second detection circuit is connect with the L2 feet of LED control chips.
6. LED according to claim 5 controls chip, which is characterized in that
The first LED switch circuit includes：First with door (517) and the first MOSFET (516), wherein described first
The drain electrode of MOSFET (516) connect with the L1 feet, the connection of source electrode and GND feet, grid and described first and the output of door (517)
End connection；Described first connect with the first input end of door (517) with the interior power supply circuit (306) output end to receive
Enable signal (EN) is stated, described first connects with the second input terminal of door (517) and the first output end of the driving circuit (308)
It connects to receive first LED drive signal (DR1)；
The second LED switch circuit includes：Second with door (518) and the 2nd MOSFET (519), wherein described second
The drain electrode of MOSFET (519) connect with the L2 feet, the connection of source electrode and GND feet, grid and described second and the output of door (518)
End connection；Described second connect with the first input end of door (518) with the interior power supply circuit (306) output end to receive
Enable signal (EN) is stated, described second connects with the second input terminal of door (518) and the second output terminal of the driving circuit (308)
It connects to receive second LED drive signal (DR2).
7. LED according to claim 6 controls chip, which is characterized in that
First detection circuit includes：
First p-type MOSFET (500) of the mutual source-drain electrode connection to be sequentially connected in series, the second p-type MOSFET (501), the
One N-type MOSFET (508), the second N-type MOSFET (509) and first resistor (515) and biasing circuit, and the second N-type MOSFET
(509) and the connecting node of first resistor (515) is connected to the source electrode of the first MOSFET (516) by the 3rd MOSFET (514),
The grid of 3rd MOSFET (514) is connected with the grid of the first MOSFET (516)；
Second detection circuit includes：
Third p-type MOSFET (502) of the mutual source-drain electrode connection to be sequentially connected in series, the 4th p-type MOSFET (503), the
Three N-type MOSFET (510), the 4th N-type MOSFET (511) and second resistance (521) and biasing circuit, and the 4th N-type MOSFET
(511) and the connecting node of second resistance (521) is connected to the source electrode of the 2nd MOSFET (519) by the 4th MOSFET (520),
The grid of 4th MOSFET (520) is connected with the grid of the 2nd MOSFET (519)；
Wherein,
The connecting node of second p-type MOSFET (501) and the first N-type MOSFET (508), the 4th p-type MOSFET (503) and third
The connecting node of N-type MOSFET (510) is separately connected the first input end and the second input terminal of nor gate (523), described or non-
The output end of door (523) is the output end of judging result signal (DL_EN).
8. LED according to claim 7 controls chip, which is characterized in that
The LED current detection circuit (307) includes for being the first p-type MOSFET (500), the second p-type MOSFET
(501), the first N-type MOSFET (508), the second N-type MOSFET (509), third p-type MOSFET (502), the 4th p-type MOSFET
(503), third N-type MOSFET (510) and the 4th N-type MOSFET (511) provides the biasing circuit of bias voltage, the biased electrical
Road includes biasing resistor (522)；And
The first resistor (515) is equal with the resistance value of second resistance (521) and is less than the resistance value of the biasing resistor (522).
9. a kind of LED light device, including flyback constant-current supply and the first LED light group connected to it, the second LED light group,
It is characterized in that, further includes that LED described in any item of the claim 1 to 8 such as controls chip, be connected to flyback constant-current supply
Between output end and the switch control terminal of the LED light group.
10. LED light device according to claim 9, which is characterized in that the VCC feet and flyback of the LED controls chip
The anode of constant-current supply output end is connected, and GND feet are connected with the cathode of flyback constant-current supply output end, L1 feet and L2 feet respectively with
First LED light group is connected with the cathode of the second LED light group.
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| CN201710288863.7A CN107027218B (en) | 2017-04-27 | 2017-04-27 | LED controls chip and LED light device |
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|---|---|---|---|
| CN201710288863.7A CN107027218B (en) | 2017-04-27 | 2017-04-27 | LED controls chip and LED light device |
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| CN110248440B (en) * | 2019-05-06 | 2021-10-19 | 深圳市安规科技有限公司 | Double-circuit switching power supply and lamp device |
| CN113765418B (en) * | 2020-06-05 | 2023-08-11 | 上海晶丰明源半导体股份有限公司 | Switching power supply controller, switching power supply system and switching power supply system power supply method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204993967U (en) * | 2015-07-30 | 2016-01-20 | 深圳市芯飞凌半导体有限公司 | LED light and two switch transfer colour temperature control circuit thereof |
| CN106341925A (en) * | 2016-09-21 | 2017-01-18 | 深圳市芯飞凌半导体有限公司 | LED driving chip, LED driving power supply system capable of adjusting color temperature, and LED lamp |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204993967U (en) * | 2015-07-30 | 2016-01-20 | 深圳市芯飞凌半导体有限公司 | LED light and two switch transfer colour temperature control circuit thereof |
| CN106341925A (en) * | 2016-09-21 | 2017-01-18 | 深圳市芯飞凌半导体有限公司 | LED driving chip, LED driving power supply system capable of adjusting color temperature, and LED lamp |
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Effective date of registration: 20210324 Address after: Building C, No.888, Huanhu West 2nd Road, Lingang New District, Pudong New Area pilot Free Trade Zone, Shanghai Patentee after: Shanghai Xinfei Semiconductor Technology Co.,Ltd. Address before: No.908, AVIC south tower, No.7 beilangshan Road, Science Park, Nanshan District, Shenzhen, Guangdong 518000 Patentee before: SILICON DRIVER SEMICONDUCTOR Co.,Ltd. |