CN107172763B - Switch toning control circuit, chip, method and switch toning LED drive system - Google Patents
Switch toning control circuit, chip, method and switch toning LED drive system Download PDFInfo
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- CN107172763B CN107172763B CN201710554709.XA CN201710554709A CN107172763B CN 107172763 B CN107172763 B CN 107172763B CN 201710554709 A CN201710554709 A CN 201710554709A CN 107172763 B CN107172763 B CN 107172763B
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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]
Abstract
The invention discloses a kind of switch toning control circuit, chip, method and switch toning LED drive systems.Circuit includes: to switch detection module to be used to detect the switch motion of input switch and export switch confirmation signal；Control module to prejudge next state according to the current state of each LED light string and switch confirmation signal, and exports switch state switching signal for receiving switch confirmation signal；Preprocessing module completes signal to control module for receiving switch state switching signal, to carry out pretreatment movement according to switch state switching signal and return to pretreatment, and pretreatment movement includes by the tension discharge in output capacitance a to voltage threshold；Control module is also used to after receiving pretreatment and completing signal, exports corresponding driving signal and at least one of multiple LED light strings is lighted or turned off, to adjust the colour temperature of the total lamp string of LED.The damage to be sparked the invention avoids output capacitance to LED light string and/or control circuit.
Description
Technical field
The present invention relates to LED illuminations to switch toning control technology field, more particularly to a kind of applied to LED tandem tap tune
Switch toning control circuit, chip, method and the switch toning LED drive system of color control.
Background technique
The advantages that LED is efficient, energy-saving and environmental protection and service life are long with it receives more and more attention, and LED lamp is as a kind of
Novel green light source is gradually instead of traditional fluorescent lamp.With the continuous expansion of LED illumination application range, LED illumination also from
Best single illumination functions are gradually to intelligent, hommization and energy saving direction development.It is right under different scenes in order to meet people
The requirement of light, the LED illumination lamp for having switch toning temperature function are come into being.
With reference to Fig. 1-2, wherein Fig. 1 is the schematic diagram of existing switch toning series LED driving circuit, and Fig. 2 is electricity shown in Fig. 1
The interdependent node waveform diagram on road.Circuit includes input switch 101, constant-current driving power supply 102, switch toning control circuit 103, string
The N number of LED light string being associated between the positive-negative output end of constant-current driving power supply 102 is shown as LED light string 104 and LED light in legend
String 104 '.Wherein switch toning control circuit 103 includes main control module 1031, with driving mould corresponding to concatenated LED light string
Block 1032,1032 ' and switch module 1033,1033 '.Its working principle is that: the switch motion of main control module detection input switch
And corresponding drive module is output control signals to according to the state of input switch and preset rules.It is opposite with each LED light string
Corresponding control signal is converted into respective drive signal by the drive module answered, switch module corresponding with each LED light string
Lighting or turning off for corresponding LED light string is controlled according to respective drive signal.
Interdependent node waveform diagram as shown in connection with fig. 2 is it is found that when different LED light string access way, the total lamp string both ends LED
Voltage phase difference it is very big.The high level of S1 represents input switch and is in closed state, and low level represents input switch and is in disconnection
State.104 driving signal D1 of LED light string is that height represents the series connection access of LED light string 104, is turned off for the low LED light string 104 that represents.
LED light string 104 ' driving signal D2 is that height represents LED light string 104 ' series connection access, is that low LED light string 104 ' is turned off.VIN table
Show the voltage between the positive and negative output end of constant-current driving power supply, the i.e. voltage at the positive and negative end of the total lamp string of LED.Generally have output electricity
Appearance is connected in parallel on the total lamp string both ends LED, during input switch is closed, if the electricity in the fashionable output capacitance of single 104 series connection of LED light string
Pressing (i.e. the positive and negative end voltage of the total lamp string of LED) is V1, if the voltage in the fashionable output capacitance of single 104 ' series connection of LED light string is
V2 (for convenience of illustrating, it is assumed herein that V2 > V1), if electricity when LED light string 104 and LED light string 104 ' access in output capacitance
Pressure is V3 (i.e. V1+V2).During input switch disconnects, output capacitance remains unchanged substantially without access of releasing, voltage.Therefore from
When LED light string 104 and LED light string 104 ' are linked into the single series connection of LED light string 104 access switching, i.e. VIN switches from V3 to V1
When, the charge in output capacitance will spark, and generated high current will flow through LED light string and control the power of chip interior
Switching tube is easy to cause LED light string and control wafer damage.
Therefore, it needs to improve the toning series LED driving of existing switch, electricity is exported when switch state being avoided to switch
LED light string caused by appearance sparks and/or control circuit damage, improve the Performance And Reliability of switch toning control circuit.
Summary of the invention
The object of the present invention is to provide a kind of switch toning control circuit, chip, method and switch toning LED drivings
System, by first carrying out pretreatment operation after detecting the switch motion of input switch, the electricity that will be stored in output capacitance
Lotus is released to safety value, then changes switch state, is sparked to avoid output capacitance when switch state switching to LED light string
And/or the damage of control circuit.
To achieve the above object, the present invention provides a kind of switch toning control circuits, are suitable for switch toning LED driving
System, the system comprises: AC power source, is electrically connected the alternating current at the input switch for being electrically connected the AC power source
It the total lamp string of the constant-flow driver of source and the input switch, LED and is connected in parallel between the positive and negative end of the total lamp string of the LED
Output capacitance, the total lamp string of LED includes concatenated multiple LED light strings；The circuit is electrically connected the constant current and drives
One output end of dynamic device and the positive and negative end of the total lamp string of the LED, the circuit includes: switch detection module, for detecting
It states the switch motion of input switch and exports switch confirmation signal；Control module, for receiving the switch confirmation signal, with root
Next state is prejudged according to the current state of each LED light string and the switch confirmation signal, and exports switch state switching letter
Number；Preprocessing module, for receiving the switch state switching signal, to be located in advance according to the switch state switching signal
Reason, which acts and returns to pretreatment, completes signal to the control module, and the pretreatment movement includes will be in the output capacitance
Tension discharge is to a voltage threshold；The control module is further used for after receiving the pretreatment and completing signal, output
Corresponding driving signal, the driving signal is for lighting or turning off at least one of the multiple LED light string, to adjust
State the colour temperature of the total lamp string of LED.
To achieve the above object, it mixes colours the present invention also provides a kind of switch and controls chip, be suitable for switch toning LED and drive
Dynamic system, the system comprises: AC power source, is electrically connected the exchange at the input switch for being electrically connected the AC power source
The total lamp string of the constant-flow driver of power supply and the input switch, LED and be connected in parallel on the total lamp string of the LED positive and negative end it
Between output capacitance, the total lamp string of LED includes concatenated multiple LED light strings；The packaging body of the chip draws equipped with DET
Foot, VIN pin, GND pin and an at least SW pin, the chip interior are equipped with switch of the present invention toning control electricity
Road；The switch detection module of the switch toning control circuit is electrically connected the DET pin, is detected by the DET pin
The switch motion of the input switch；The preprocessing module of the switch toning control circuit is electrically connected the VIN pin, leads to
The VIN pin is crossed by the tension discharge in the output capacitance a to voltage threshold；When switch toning control circuit packet
When including switch module, the VIN pin, GND pin and corresponding SW pin is electrically connected in the switch module, passes through phase
SW pin is answered to control lighting or turning off for corresponding LED light string.
To achieve the above object, the present invention also provides a kind of switch mix colours LED drive system, the system comprises: hand over
Galvanic electricity source, is electrically connected the AC power source and the input switch at the input switch for being electrically connected the AC power source
The total lamp string of constant-flow driver, LED and the output capacitance for being connected in parallel on the total lamp string both ends the LED, the total lamp string of the LED include string
Multiple LED light strings of connection；It is characterized in that, the system further comprises switch toning control circuit of the present invention；Institute
State switch toning control circuit be electrically connected the constant-flow driver an output end and the total lamp string of the LED just,
Negative terminal.
To achieve the above object, the present invention also provides a kind of switch toning control methods, are suitable for switch toning LED and drive
Dynamic system, the system comprises: AC power source, is electrically connected the exchange at the input switch for being electrically connected the AC power source
The total lamp string of the constant-flow driver of power supply and the input switch, LED and the output electricity for being connected in parallel on the total lamp string both ends the LED
Hold, the total lamp string of LED includes concatenated multiple LED light strings；It is characterized in that, which comprises (1) detect the input
The switch motion of switch simultaneously exports switch confirmation signal；(2) the switch confirmation signal is received, according to each LED light string
Current state and the switch confirmation signal prejudge next state, and export switch state switching signal；(3) it is opened described in receiving
Off status switching signal completes signal to carry out pretreatment movement according to the switch state switching signal and return to pretreatment,
The pretreatment movement includes by the tension discharge in the output capacitance a to voltage threshold；(4) pretreatment is received
It completes signal and exports corresponding driving signal；(5) corresponding driving signal is received with by least the one of the multiple LED light string
It is a to light or turn off, to adjust the colour temperature of the total lamp string of LED.
It is an advantage of the current invention that pretreatment operation is first carried out after detecting the switch motion of input switch, it will be defeated
For the charge discharging resisting stored on capacitor out to safety value, switch state is completed and then is changed in operation to be pre-treated, avoids switch
Output capacitance sparks the damage to LED light string and/or control circuit when state switches, and improves switch toning control circuit
Performance And Reliability.
Detailed description of the invention
Fig. 1, the schematic diagram of existing switch toning series LED driving circuit；
Fig. 2 is the interdependent node waveform diagram of circuit shown in Fig. 1；
Fig. 3, the configuration diagram of switch toning one embodiment of LED drive system of the present invention；
Fig. 4, the circuit diagram of one embodiment of preprocessing module of the present invention；
Fig. 5 is the interdependent node waveform diagram of system shown in Figure 3；
Fig. 6, the circuit diagram of another embodiment of preprocessing module of the present invention.
Specific embodiment
With reference to the accompanying drawing to switch provided by the invention toning control circuit, chip, method and switch toning LED driving
System elaborates.
With reference to Fig. 3-5, wherein Fig. 3 is the framework signal of switch toning one embodiment of LED drive system of the present invention
Figure；Fig. 4 is the circuit diagram of one embodiment of preprocessing module of the present invention；Fig. 5 is the interdependent node waveform of system shown in Figure 3
Figure.
As shown in figure 3, the switch toning LED drive system includes: AC power source AC, is electrically connected the alternating current
The input switch S1 of source AC, constant-flow driver 31, the LED for being electrically connected the AC power source AC and input switch S1 are total
Lamp string 33 and the output capacitance C0 being connected in parallel between the positive and negative end of the total lamp string 33 of the LED.AC power source AC is generally city
Electricity, on mono- end Jie AC power source AC of input switch S1, other end connects constant-flow driver 31；Constant-flow driver 31 is by input
AC power source is converted to constant current source, output to concatenated multiple LED light strings；The positive and negative output end of constant-flow driver 31 it
Between be generally parallel with output capacitance C0 namely output capacitance C0 and connect between the positive and negative end of the total lamp string 33 of LED；The total lamp of LED
String 33 includes concatenated multiple LED light strings.The present embodiment is illustrated by taking concatenated two LED light strings LED1, LED2 as an example；?
In other embodiments, the total lamp string 33 of LED may include concatenated more than two LED light strings, and circuit connection and control mode can
Referring to the present embodiment.
As shown in figure 3, the system further comprises switch toning control circuit 32, the switch toning control circuit
32 are electrically connected the positive and negative end of an output end of the constant-flow driver 31 and the total lamp string 33 of the LED；The switch
Toning control circuit 32 includes: switch detection module 321, control module 322 and preprocessing module 323.
The switch detection module 321, for detecting the switch motion of the input switch S1 and exporting switch confirmation letter
Number.For example, the high level of input switch S1, which represents input switch S1, is in closed state, switch confirmation signal is high level；It is defeated
The low level for entering switch S1 represents input switch S1 and is in an off state, and switch confirmation signal is low level.
The control module 322, for receiving the switch confirmation signal, according to the current state of each LED light string
Next state is prejudged with the switch confirmation signal, and exports switch state switching signal.
The preprocessing module 323, for receiving the switch state switching signal, to be switched according to the switch state
Signal carries out pretreatment movement and returns to pretreatment completion signal to the control module 323, and the pretreatment movement includes will
The total 33 both end voltage VIN of lamp string of LED (voltage on the i.e. described output capacitance C0) is discharged to a voltage threshold.
The control module 322 is further used for after receiving the pretreatment and completing signal, exports corresponding driving
Signal, the driving signal is for lighting or turning off at least one of the multiple LED light string LED1, LED2, to adjust
State the colour temperature of the total lamp string 33 of LED.
Since before concatenated multiple LED light string access ways change, preprocessing module 323 has completed beam worker
Make, so the high current that not will lead to output capacitance after changing concatenated multiple LED light string access ways sparks, avoids
High current leads to a possibility that LED light string and/or control wafer damage, improve switch toning control circuit performance and can
By property.
The preferred switch toning control circuit 32 further includes switch module 324, and the switch module 324 includes multiple
Submodule is switched, each switch submodule is respectively used to receive a corresponding driving signal to control a corresponding LED light string
It lights or turns off, to realize the different access ways of multiple LED light strings to adjust the colour temperature of the total lamp string of LED.
The present embodiment is illustrated by taking concatenated two switches K1, K2 as an example；In other embodiments, switch module 324
It may include concatenated more than two switches, circuit connection and control mode can refer to the present embodiment.The first end of switch K1
It is electrically connected the first end of LED light string LED1, control terminal receives the driving signal D1 that control module 322 exports；The of switch K2
Two ends are electrically connected the second end of LED light string LED2, and control terminal receives the driving signal D2 that control module 322 exports；It is concatenated
The common end of switch K1 and switch K2 is electrically connected the common end of concatenated LED light string LED1, LED light string LED2.Switch K1, K2
Corresponding driving signal is received to be closed or turn off, realizes the different access ways of LED light string LED1, LED2.For example, driving letter
Number D1 is that height represents K1 disconnection, and LED1 series connection access is lit, and represents K1 closure to be low, LED1 is turned off；Driving signal D2 is
Gao represents K2 disconnection, and LED2 series connection access is lit, and represents K2 closure to be low, LED2 is turned off.Specific switch K1, K2 can be with
For power switch tube, the power switch tube based on the received lighted with controlling corresponding LED light string by driving signal closure, or according to
Received driving signal shutdown is to control corresponding LED light string shutdown.
As shown in figure 4, the preprocessing module 323 includes: voltage detection unit 401, operational amplifier OP1, electric discharge control
Unit 403 is completed in unit 402 processed and pretreatment.The voltage detection unit 401, operational amplifier OP1, control of discharge unit
402 and output capacitance C0 forms feedback control loop, and the voltage on the output capacitance C0 is made to be clamped at voltage threshold.
The voltage detection unit 401, for detecting the voltage on the output capacitance C0 and voltage sense signal.
Specifically, the voltage detection unit 401 includes concatenated first resistor R1 and second resistance R2；The of the first resistor R1
One end is electrically connected the output capacitance C0, the second end ground connection of the second resistance R2, the first resistor R1 and described the
The common end of two resistance R2 is electrically connected the positive input of the operational amplifier OP1, to detect and sample output capacitance C0
On voltage VIN obtain voltage detection signal.Specifically, the voltage value of voltage detection signal are as follows: VIN*R2/ (R1+R2).
It should be noted that detecting since output capacitance C0 is connected in parallel on total 33 both ends of lamp string LED and sampling output capacitance C0
On voltage VIN, as detect and sample the voltage at total 33 both ends of lamp string LED.
The operational amplifier OP1, positive input is for receiving the voltage detection signal, and reverse input end is for connecing
Reference voltage signal VREF is received, enabled input terminal EN is for receiving the switch state switching signal, output end output electric discharge control
Signal processed.(enabled input terminal EN is enabled), operational amplifier when the switch state switching signal that control module 322 exports is effective
OP1 starts to work, and the voltage VIN on output capacitance C0 is detected and sampled by voltage detection unit 401, and and reference voltage signal
VREF is compared, and is discharged with controlling control of discharge unit 402 and starting or stopping output capacitance C0.
The control of discharge unit 402, for receiving the discharge control signal, to start or stop to the output electricity
Hold C0 electric discharge.Specifically, when the voltage value of voltage detection signal is more than or equal to the voltage value of reference voltage signal VREF, electric discharge
Control unit 402 starts to discharge to output capacitance C0；When the voltage value of voltage detection signal is less than reference voltage signal VREF's
When voltage value, control of discharge unit 402 stops discharging to output capacitance C0.Specifically, the control of discharge unit 402 includes function
The first end of rate metal-oxide-semiconductor M1, the power MOS pipe M1 are electrically connected the output capacitance C0, second end ground connection, control terminal electrical property
Connect the output end of the operational amplifier OP1；The power MOS pipe M1 is led for the discharge control signal based on the received
It passes to and starts to discharge to the output capacitance C0, or the discharge control signal is turned off to stop to the output based on the received
Capacitor C0 electric discharge.
Unit 403 is completed in the pretreatment, is clamped at the voltage threshold for the voltage on the output capacitance C0
After value, output pretreatment completes signal to the control module 322.Optionally, it includes a meter that unit 403 is completed in the pretreatment
When device T1, the timer T1 start timing after receiving the switch state switching signal, and export at the end of timing pre-
Processing completes signal to the control module 322.
That is, in the present embodiment, when the switch state switching signal that control module 322 exports is effective, operational amplifier
OP1 starts to work, and the grid voltage of regulation power metal-oxide-semiconductor M1 discharges to output capacitance C0, while timer T1 starts timing.It is defeated
The voltage VIN on capacitor C0 is detected and is sampled by voltage detection unit 401 out, and is carried out with preset reference voltage signal VREF
Compare.When VIN*R2/ (R1+R2) is more than or equal to VREF when VREF* (R1+R2)/R2 (namely VIN be more than or equal to), power MOS
Pipe M1 conducting starts to discharge to output capacitance C0；When VIN is less than VREF* (R1+R2)/R2 (namely VIN is less than VREF* (R1+
R2)/R2 when), power MOS pipe M1 shutdown, stop to output capacitance C0 discharge.Feedback control loop makes the voltage on output capacitance C0 most
It is clamped at VREF* (R1+R2)/R2 namely the voltage threshold eventually as fixed setting value: VREF* (R1+R2)/R2；Wherein,
VREF is the voltage value of the reference voltage signal, and R1 is the resistance value of the first resistor, and R2 is the electricity of the second resistance
Resistance value
In conjunction with Fig. 3-5 it is found that when different LED light strings accesses, the voltage on output capacitance C0 can all first drop to setting
Value V0=VREF* (R1+R2)/R2.In diagram, the high level of input switch S1 represents input switch S1 and is in closed state, low
Level representative input switch S1 is in an off state.Drive the driving signal D1 of LED light string LED1 for high representation switch K1 disconnection,
LED light string LED1 series connection access is lit, and is closed for low representation switch K1, LED light string LED1 is turned off.Drive LED light string
LED2 driving signal D2 is high representation switch K2 disconnection, and LED light string LED2 series connection access is lit, closes for low representation switch K2
It closes, LED light string LED2 is turned off.VIN indicates voltage (namely the electricity between the positive and negative end of the total lamp string of LED on output capacitance C0
Pressure).During input switch S1 closure, if only LED1 series connection is fashionable, the voltage on output capacitance C0 is V1；If only
LED2 series connection is fashionable, and the voltage on output capacitance C0 is V2 (it is assumed herein that V2 > V1)；It is defeated if LED1 and LED2 are accessed
The voltage on capacitor C0 is V3 (V3=V1+V2) out.During input switch S1 is disconnected, preprocessing module 323 is by output capacitance
Voltage on C0 is discharged to V0 (V0=VREF* (R1+R2)/R2) in advance, when then input switch S1 being waited to be closed again, output
Voltage on capacitor C0 rises to corresponding target value (relevant voltage V1, V2, V3) from V0.For example, being connect from LED1 and LED2
Enter when connecting access switching to only LED1 (i.e. when VIN switches from V3 to V1), charge on output capacitance C0 will be in advance from putting
Electric V3 to V0, then rises to V1 from V0.That is, the discharge current of output capacitance C0 is by the electric discharge inside preprocessing module 323
Control unit 402 limits, and will not generate high current, and LED light string and/or control circuit is protected to be hardly damaged.
It is the circuit diagram of another embodiment of preprocessing module of the present invention, with embodiment illustrated in fig. 4 with reference to Fig. 6
The difference is that voltage threshold is the particular value generated according to switch state switching signal in the present embodiment.Specifically, institute
It states preprocessing module 323 and is additionally arranged reference voltage signal generator 601.The reference voltage signal generator 601, input termination
The switch state switching signal is received, output end is electrically connected the reverse input end of the operational amplifier OP1, for according to institute
It states switch state switching signal to generate corresponding reference voltage signal and export, so that the voltage threshold is to switch with switch state
The relevant value of target voltage afterwards.
Switch toning control circuit in switch toning LED drive system provided by the invention, is detecting input switch
Switch motion after, pretreatment operation is first carried out, by the charge discharging resisting stored in output capacitance to safety value, behaviour to be pre-treated
Make to complete and then change switch state, when avoiding switch state switching output capacitance spark to LED light string and/or
The damage of control circuit improves the Performance And Reliability of switch toning control circuit.
It mixes colours the present invention also provides a kind of switch and controls chip, be suitable for switch toning LED drive system, the system
Include: AC power source AC, the input switch S1 for being electrically connected the AC power source AC, be electrically connected the AC power source AC and
The total lamp string 33 of constant-flow driver 31, the LED of the input switch S1 and be connected in parallel on the total lamp string 33 of the LED positive and negative end it
Between output capacitance C0, the total lamp string 33 of LED include concatenated multiple LED light strings.The packaging body of the chip is equipped with DET
Pin, VIN pin, GND pin and an at least SW pin, the chip interior are equipped with switch of the present invention toning control
Circuit 32 (can refer to shown in Fig. 3).
Specifically, the switch detection module 321 of the switch toning control circuit 32 is electrically connected the DET pin, lead to
Cross the switch motion that the DET pin detects the input switch S1；The preprocessing module of the switch toning control circuit 32
323 are electrically connected the VIN pins, by the VIN pin by the tension discharge on the output capacitance C0 a to voltage threshold
Value.When switch toning control circuit 32 includes switch module 324, the switch module 324 is electrically connected described
VIN pin, GND pin and corresponding SW pin control lighting or turning off for corresponding LED light string by corresponding SW pin.
Preferably, the switch module 324 includes multiple concatenated switch submodules, and first switchs the first of submodule
End is electrically connected the VIN pin, and the second end of the last one switch submodule is electrically connected the GND pin, two neighboring
The common end for switching submodule is electrically connected a SW pin.Referring to shown in Fig. 3, in concatenated two switches K1, K2, switch K1's
First end is electrically connected VIN pin, to be electrically connected first end (namely the total lamp string of LED of LED light string LED1 by VIN pin
Anode), control terminal receive control module 322 export driving signal D1；The second end of switch K2 is electrically connected GND pin,
To be electrically connected the second end (namely negative terminal of the total lamp string of LED) of LED light string LED2 by GND pin, control terminal receives control
The driving signal D2 that module 322 exports；The common end of concatenated switch K1 and switch K2 is electrically connected SW pin, to be drawn by SW
Foot is electrically connected the common end of concatenated LED light string LED1, LED light string LED2.Switch K1, K2 receive corresponding driving signal with
Closure or shutdown, realize the different access ways of LED light string LED1, LED2.
The present invention also provides a kind of switch toning control methods, are suitable for switch toning LED drive system, the system
Include: AC power source, the input switch for being electrically connected the AC power source, be electrically connected the AC power source and the input
The total lamp string of constant-flow driver, LED of switch and the output capacitance for being connected in parallel on the total lamp string both ends the LED, the total lamp string of LED
Including concatenated multiple LED light strings；The switch toning control method includes: the switch motion that (1) detects the input switch
And export switch confirmation signal；(2) the switch confirmation signal is received, according to the current state of each LED light string and described
It switchs confirmation signal and prejudges next state, and export switch state switching signal；(3) the switch state switching letter is received
Number, signal is completed to carry out pretreatment movement according to the switch state switching signal and return to pretreatment, the pretreatment is dynamic
Work includes by the tension discharge in the output capacitance a to voltage threshold；(4) it receives the pretreatment and completes signal and defeated
Corresponding driving signal out；(5) corresponding driving signal is received to light or close at least one of the multiple LED light string
It is disconnected, to adjust the colour temperature of the total lamp string of LED.
In one embodiment, the switch state switching signal is received, to carry out according to the switch state switching signal
Pretreatment act and return pretreatment complete signal method it is further are as follows: (31) detect the voltage in the output capacitance and defeated
Voltage detection signal out；(32) voltage detection signal, reference voltage signal, switch state switching letter are received respectively
Number, discharge control signal is exported after carrying out operation amplifier；(33) it is started or stopped according to the discharge control signal to described defeated
Capacitor discharges out, and the voltage in the output capacitance is made to be clamped at the voltage threshold；(34) in the output capacitance
After voltage is clamped at the voltage threshold, signal is completed in output pretreatment.
In one embodiment, the method for detecting the voltage in the output capacitance and voltage sense signal is further
Are as follows: the voltage in the output capacitance and voltage sense signal are detected by concatenated first resistor and second resistance,
Described in the first end of first resistor be electrically connected the output capacitance, the second end ground connection of the second resistance, described first
The common end voltage sense signal of resistance and the second resistance.Correspondingly, the voltage threshold are as follows: VREF* (R1+
R2 wherein, VREF is the voltage value of the reference voltage signal to)/R2, and R1 is the resistance value of the first resistor, and R2 is described the
The resistance value of two resistance.
In one embodiment, the reference voltage signal is further generated according to the switch state switching signal, so that
The voltage threshold is value relevant to the target voltage after switch state switching.
In one embodiment, it is started or stopped according to the discharge control signal and is discharged the output capacitance, made described
The method that voltage in output capacitance is clamped at the voltage threshold is further are as follows: passes through power MOS pipe institute based on the received
Discharge control signal conducting is stated to start to discharge to the output capacitance, or passes through the power MOS pipe electric discharge based on the received
The shutdown of control signal is to stop discharging to the output capacitance；Wherein the first end of the power MOS pipe is electrically connected described defeated
Capacitor out, second end ground connection, control terminal are used for the received discharge control signal.
In one embodiment, after the voltage in the output capacitance is clamped at the voltage threshold, output pretreatment
The method for completing signal is further are as follows: timing is started after receiving the switch state switching signal by a timer, and
Signal is completed in output pretreatment at the end of timing.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
Member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications also should be regarded as
Protection scope of the present invention.
Claims (17)
- The control circuit 1. a kind of switch is mixed colours is suitable for switch toning LED drive system, the system comprises: AC power source, electricity Property the constant current driving that connects the input switch of the AC power source, be electrically connected the AC power source and the input switch The total lamp string of device, LED and the output capacitance being connected in parallel between the positive and negative end of the total lamp string of the LED, the total lamp string of LED include Concatenated multiple LED light strings；It is characterized in that, the circuit be electrically connected the constant-flow driver an output end and The positive and negative end of the total lamp string of LED, the circuit include:Detection module is switched, for detecting the switch motion of the input switch and exporting switch confirmation signal；Control module, for receiving the switch confirmation signal, with true according to the current state of each LED light string and the switch Recognize signal and prejudge next state, and exports switch state switching signal；Preprocessing module, it is pre- to be carried out according to the switch state switching signal for receiving the switch state switching signal Processing, which acts and returns to pretreatment, completes signal to the control module, and the pretreatment movement includes will be in the output capacitance Tension discharge to a voltage threshold；Wherein,The preprocessing module includes: voltage detection unit, for detecting the voltage in the output capacitance and output voltage inspection Survey signal；Operational amplifier, positive input is for receiving the voltage detection signal, and reverse input end is for receiving benchmark electricity Signal is pressed, enabled input terminal exports discharge control signal for receiving the switch state switching signal, output end；Control of discharge Unit discharges to the output capacitance with starting or stopping for receiving the discharge control signal；The voltage detecting list Member, operational amplifier, control of discharge unit and output capacitance composition feedback control loop clamp the voltage in the output capacitance Position is in the voltage threshold；Unit is completed in pretreatment, is clamped at the voltage threshold for the voltage in the output capacitance After value, output pretreatment completes signal to the control module；The control module is further used for after receiving the pretreatment and completing signal, exports corresponding driving signal, institute Driving signal is stated for lighting or turning off at least one of the multiple LED light string, to adjust the color of the total lamp string of the LED Temperature.
- 2. circuit according to claim 1, which is characterized in that the circuit further includes switch module, the switch module Including multiple switch submodule, each switch submodule is respectively used to receive a corresponding driving signal to control one accordingly LED light string being lighted or turning off, to realize the different access ways of multiple LED light strings to adjust the colour temperature of the total lamp string of LED.
- 3. circuit according to claim 2, which is characterized in that the switch submodule includes power switch tube, the function Rate switching tube based on the received lighted with controlling corresponding LED light string by driving signal closure, or driving signal turns off based on the received To control corresponding LED light string shutdown.
- 4. circuit according to claim 1, which is characterized in that the voltage detection unit include concatenated first resistor and Second resistance；The first end of the first resistor is electrically connected the output capacitance, the second end ground connection of the second resistance, and described the The common end of one resistance and the second resistance is electrically connected the positive input of the operational amplifier.
- 5. circuit according to claim 4, which is characterized in that the voltage threshold are as follows:VREF*(R1+R2)/R2Wherein, VREF is the voltage value of the reference voltage signal, and R1 is the resistance value of the first resistor, and R2 is described second The resistance value of resistance.
- 6. circuit according to claim 1, which is characterized in that the preprocessing module further comprises: reference voltage letter Number generator；The reference voltage signal generator, input terminal receive the switch state switching signal, described in output end is electrically connected The reverse input end of operational amplifier, for generating corresponding reference voltage signal and defeated according to the switch state switching signal Out, so that the voltage threshold is value relevant to the target voltage after switch state switching.
- 7. circuit according to claim 1, which is characterized in that the control of discharge unit includes power MOS pipe, the function The first end of rate metal-oxide-semiconductor is electrically connected the output capacitance, second end ground connection, and control terminal is electrically connected the operational amplifier Output end；The power MOS pipe is connected for the discharge control signal based on the received to start to discharge to the output capacitance, Or the discharge control signal is turned off to stop discharging to the output capacitance based on the received.
- 8. circuit according to claim 1, which is characterized in that it includes a timer that unit is completed in the pretreatment, described Timer starts timing after receiving the switch state switching signal, and output pretreatment completes signal extremely at the end of timing The control module.
- 9. a kind of switch toning control chip, is suitable for switch toning LED drive system, the system comprises: AC power source, electricity Property the constant current driving that connects the input switch of the AC power source, be electrically connected the AC power source and the input switch The total lamp string of device, LED and the output capacitance being connected in parallel between the positive and negative end of the total lamp string of the LED, the total lamp string of LED include Concatenated multiple LED light strings；It is characterized in that, the packaging body of the chip be equipped with DET pin, VIN pin, GND pin with And an at least SW pin, the chip interior are equipped with the toning control circuit of switch described in claim 1-8 any one；The switch detection module of the switch toning control circuit is electrically connected the DET pin, is detected by the DET pin The switch motion of the input switch；The preprocessing module of the switch toning control circuit is electrically connected the VIN pin, will be described by the VIN pin Tension discharge in output capacitance is to a voltage threshold；When the switch toning control circuit include switch module when, the switch module be electrically connected the VIN pin, GND pin and corresponding SW pin control lighting or turning off for corresponding LED light string by corresponding SW pin.
- 10. chip according to claim 9, which is characterized in that the switch module includes multiple concatenated switch submodules The first end of block, first switch submodule is electrically connected the VIN pin, and the second end of the last one switch submodule is electrical The GND pin is connected, the common end of two neighboring switch submodule is electrically connected a SW pin.
- The LED drive system 11. a kind of switch is mixed colours, the system comprises: AC power source is electrically connected the defeated of the AC power source Enter switch, be electrically connected the total lamp string of constant-flow driver, LED of the AC power source and the input switch and be connected in parallel on institute The output capacitance at the total lamp string both ends LED is stated, the total lamp string of LED includes concatenated multiple LED light strings；It is characterized in that, the system further comprises the toning control circuit of switch described in claim 1-8 any one；An output end and the total lamp string of the LED for the constant-flow driver is electrically connected in the switch toning control circuit Positive and negative end.
- The control method 12. a kind of switch is mixed colours is suitable for switch toning LED drive system, the system comprises: AC power source, It is electrically connected the input switch of the AC power source, is electrically connected the AC power source and the constant current driving of the input switch The total lamp string of device, LED and the output capacitance for being connected in parallel on the total lamp string both ends the LED, the total lamp string of the LED includes concatenated multiple LED light string；It is characterized in that, which comprises(1) it detects the switch motion of the input switch and exports switch confirmation signal；(2) the switch confirmation signal is received, according to the current state of each LED light string and switch confirmation signal anticipation Next state, and export switch state switching signal；(3) the switch state switching signal is received, to carry out pretreatment movement according to the switch state switching signal and return It returns pretreatment and completes signal, the pretreatment movement includes by the tension discharge in the output capacitance a to voltage threshold；Its In, step (3) further comprises: (31) detect voltage and voltage sense signal in the output capacitance；(32) voltage detection signal, reference voltage signal, the switch state switching signal are received respectively, are carried out operation and are put Discharge control signal is exported after big；(33) it is started or stopped according to the discharge control signal and is discharged the output capacitance, made Voltage in the output capacitance is clamped at the voltage threshold；(34) voltage in the output capacitance is clamped at institute After stating voltage threshold, signal is completed in output pretreatment；(4) pretreatment is received to complete signal and export corresponding driving signal；(5) the corresponding driving signal of reception is total to adjust LED to light or turn off at least one of the multiple LED light string The colour temperature of lamp string.
- 13. according to the method for claim 12, which is characterized in that step (31) further comprises:The voltage in the output capacitance and voltage sense signal are detected by concatenated first resistor and second resistance, Described in the first end of first resistor be electrically connected the output capacitance, the second end ground connection of the second resistance, described first The common end voltage sense signal of resistance and the second resistance.
- 14. according to the method for claim 13, which is characterized in that the voltage threshold are as follows:VREF*(R1+R2)/R2Wherein, VREF is the voltage value of the reference voltage signal, and R1 is the resistance value of the first resistor, and R2 is described second The resistance value of resistance.
- 15. according to the method for claim 12, which is characterized in that the further root of reference voltage signal described in step (32) It is generated according to the switch state switching signal, so that the voltage threshold is relevant to the target voltage after switch state switching Value.
- 16. according to the method for claim 12, which is characterized in that step (33) further comprises:By power MOS pipe, the discharge control signal is connected to start to discharge to the output capacitance based on the received, or logical The discharge control signal is turned off to stop discharging to the output capacitance overpower metal-oxide-semiconductor based on the received；The wherein function The first end of rate metal-oxide-semiconductor is electrically connected the output capacitance, and second end ground connection, control terminal is for the received control of discharge letter Number.
- 17. according to the method for claim 12, which is characterized in that step (34) further comprises:Start timing after receiving the switch state switching signal by a timer, and exports pretreatment at the end of timing Complete signal.
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| CN201710554709.XA CN107172763B (en) | 2017-07-10 | 2017-07-10 | Switch toning control circuit, chip, method and switch toning LED drive system |
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| CN201710554709.XA CN107172763B (en) | 2017-07-10 | 2017-07-10 | Switch toning control circuit, chip, method and switch toning LED drive system |
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| CN107172763B true CN107172763B (en) | 2019-03-08 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108617053A (en) * | 2018-05-25 | 2018-10-02 | 北京小米移动软件有限公司 | The control method of lamp-controlling circuit and lamps and lanterns |
| CN113099573B (en) * | 2021-04-02 | 2022-08-05 | 深圳市明微电子股份有限公司 | LED color temperature control chip, LED lamp and switch segmented dimming and color mixing control method |
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| KR20160027736A (en) * | 2014-09-02 | 2016-03-10 | 주식회사 씨티아이월드 | LED Converter Module One-piece Type Power Control Method having Lighting Continuous Capacity and Apparatus Thereof |
| CN205124073U (en) * | 2015-11-09 | 2016-03-30 | 深圳市稳先微电子有限公司 | Utilize switch to realize circuit and lamps and lanterns of adjusting luminance |
| CN206993459U (en) * | 2017-07-10 | 2018-02-09 | 上海晶丰明源半导体股份有限公司 | Switch toning control circuit, chip and switch toning LED drive system |
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| CN102548101B (en) * | 2010-12-27 | 2014-05-28 | 英飞特电子（杭州）股份有限公司 | LED dimming system |
| CN102709871B (en) * | 2012-06-25 | 2014-12-10 | 英飞特电子（杭州）股份有限公司 | Impulse current inhibiting circuit and supply circuit |
| CN105430816A (en) * | 2014-09-15 | 2016-03-23 | 马士科技有限公司 | Light-emitting control device, light-emitting system using light-emitting control device, and control method of light-emitting system |
| CN105025632B (en) * | 2015-07-30 | 2018-09-21 | 深圳市芯飞凌半导体有限公司 | A kind of LED lamp and its control circuit of switch toning |
| CN106793324B (en) * | 2017-01-04 | 2019-03-05 | 上海晶丰明源半导体股份有限公司 | Switch toning temperature controller and method, LED constant current drive system |
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| KR20160027736A (en) * | 2014-09-02 | 2016-03-10 | 주식회사 씨티아이월드 | LED Converter Module One-piece Type Power Control Method having Lighting Continuous Capacity and Apparatus Thereof |
| CN205124073U (en) * | 2015-11-09 | 2016-03-30 | 深圳市稳先微电子有限公司 | Utilize switch to realize circuit and lamps and lanterns of adjusting luminance |
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