CN206993459U - Switch toning control circuit, chip and switch toning LED drive system - Google Patents
Switch toning control circuit, chip and switch toning LED drive system Download PDFInfo
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- CN206993459U CN206993459U CN201720824176.8U CN201720824176U CN206993459U CN 206993459 U CN206993459 U CN 206993459U CN 201720824176 U CN201720824176 U CN 201720824176U CN 206993459 U CN206993459 U CN 206993459U
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Abstract
The utility model discloses one kind to switch toning control circuit, chip and switch toning LED drive system.Circuit includes：Switch detection module is used for switch motion and the output switch confirmation signal for detecting input switch；Control module is used to receive switch confirmation signal, and next state, and output switch state switching signal are prejudged with the current state according to each LED string and switch confirmation signal；Pretreatment module is used to receive on off state switching signal, completes signal to control module to carry out pretreatment action according on off state switching signal and return to pretreatment, pretreatment, which acts, to be included the tension discharge in output capacitance a to voltage threshold；Control module is additionally operable to after receiving pretreatment and completing signal, exports corresponding drive signal and at least one of multiple LED strings is lighted or turned off, to adjust the colour temperature of the total lamp strings of LED.The utility model avoids the damage that output capacitance sparks to LED string and/or control circuit.
Description
Technical field
LED illumination switch toning control technology field is the utility model is related to, more particularly to a kind of LED strip connection that is applied to is opened
Close switch toning control circuit, chip and the switch toning LED drive system of toning control.
Background technology
LED is received more and more attention with the advantages that its efficient, energy-saving and environmental protection and long lifespan, and LED lamp is as a kind of
Novel green light source progressively instead of traditional fluorescent lamp.With the continuous expansion of LED illumination application, LED illumination also from
Best single illumination functions gradually develop to intelligent, hommization and energy saving direction.In order to meet people under different scenes it is right
The requirement of light, the LED illumination lamp for possessing switch toning temperature function are arisen at the historic moment.
With reference to figure 1-2, wherein Fig. 1 is the schematic diagram of existing switch toning series LED drive circuit, and Fig. 2 is electricity shown in Fig. 1
The interdependent node oscillogram on road.Circuit includes input switch 101, constant-current driving power supply 102, switch toning control circuit 103, string
The N number of LED string being associated between the positive-negative output end of constant-current driving power supply 102, LED string 104 and LED are shown as in legend
String 104 '.Wherein switch toning control circuit 103 includes main control module 1031, with the driving mould corresponding to the LED string connected
Block 1032,1032 ' and switch module 1033,1033 '.Its operation principle is：Main control module detects the switch motion of input switch
And corresponding drive module is output control signals to according to the state and preset rules of input switch.It is relative with each LED string
Corresponding control signal is converted into respective drive signal by the drive module answered, the switch module corresponding with each LED string
Lighting or turning off for corresponding LED string is controlled according to respective drive signal.
Interdependent node oscillogram with reference to shown in Fig. 2 understands, during different LED string access ways, the total lamp string both ends of LED
Voltage phase difference it is very big.S1 high level represents input switch and is in closure state, and low level, which represents input switch and is in, to be disconnected
State.The drive signal D1 of LED string 104 is that height represents the series connection access of LED string 104, is turned off for the low LED string 104 that represents.
' it ' series connection access, is that low LED string 104 ' is turned off that drive signal D2 represents LED string 104 for height to LED string 104.VIN tables
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 strings of LED.It is general to have output electricity
Appearance is connected in parallel on the total lamp string both ends of LED, during input switch closes, if the electricity in the fashionable output capacitance of single series connection of LED string 104
It is V1 to press (i.e. the positive and negative terminal voltage of the total lamp strings of LED), if the voltage in the fashionable output capacitance of single series connection of LED string 104 ' is
V2 is (for convenience of illustrating, it is assumed herein that V2>V1), if electricity when LED string 104 and LED string 104 ' access in output capacitance
Press as V3 (i.e. V1+V2).During input switch disconnects, output capacitance remains unchanged substantially without path of releasing, its voltage.Therefore from
When LED string 104 and LED string 104 ' are linked into the single series connection of LED string 104 access switching, i.e. VIN switches from V3 to V1
When, the electric charge in output capacitance will spark, and caused high current will flow through power inside LED string and control chip
Switching tube, LED string and control chip is easily caused to damage.
Therefore, need badly and existing switch toning series LED driving is improved, avoid on off state from exporting electricity when switching
Hold LED string caused by sparking and/or control circuit damage, improve the Performance And Reliability for switching control circuit of mixing colours.
Utility model content
The purpose of this utility model is, there is provided one kind switch toning control circuit, chip and switch toning LED drivetrains
System, by after the switch motion of input switch is detected, first carrying out pretreatment operation, the electric charge that will be stored in output capacitance
Release to safety value, then change on off state, during avoiding on off state from switching output capacitance spark to LED string and/
Or the damage of control circuit.
To achieve the above object, the utility model provides a kind of switch toning control circuit, suitable for switch toning LED
Drive system, the system include：AC power, the input switch for being electrically connected with the AC power, it is electrically connected with the friendship
Flow the total lamp string of constant-flow driver, LED of power supply and the input switch and be connected in parallel on the positive and negative end of the total lamp strings of the LED
Between output capacitance, the total lamp strings of LED include series connection multiple LED strings；The perseverance is electrically connected in the circuit
Flowing an output end of driver and the positive and negative end of the total lamp strings of the LED, the circuit includes：Detection module is switched, for examining
Survey the switch motion of the input switch and output switch confirmation signal；Control module, for receiving the switch confirmation signal,
Next state is prejudged with the current state according to each LED string and the switch confirmation signal, and output switch state is cut
Change signal；Pretreatment module, for receiving the on off state switching signal, to be carried out according to the on off state switching signal
Pretreatment, which acts and returns to pretreatment, completes signal to the control module, and the pretreatment, which acts, to be included the output capacitance
On tension discharge to a voltage threshold；The control module is further used for after receiving the pretreatment and completing signal,
Corresponding drive signal is exported, the drive signal is used at least one of the multiple LED string is lighted or turned off, to adjust
Save the colour temperature of the total lamp strings of the LED.
To achieve the above object, the utility model additionally provides a kind of switch toning control chip, is mixed colours suitable for switch
LED drive system, the system include：AC power, the input switch for being electrically connected with the AC power, be electrically connected with described in
The total lamp string of the constant-flow driver of AC power and the input switch, LED and it is connected in parallel on the positive and negative of the total lamp strings of the LED
Output capacitance between end, the total lamp strings of LED include multiple LED strings of series connection；The packaging body of the chip is provided with DET
Pin, VIN pins, GND pin and an at least SW pins, the chip internal are provided with switch described in the utility model and mixed colours
Control circuit；The switch detection module of the switch toning control circuit is electrically connected with the DET pins, is drawn by the DET
Pin detects the switch motion of the input switch；The pretreatment module of the switch toning control circuit is electrically connected with the VIN
Pin, by the VIN pins by the tension discharge in the output capacitance a to voltage threshold；When the switch toning control
When circuit includes switch module, the VIN pins, GND pin and corresponding SW pins is electrically connected in the switch module,
Lighting or turning off for corresponding LED string is controlled by corresponding SW pins.
To achieve the above object, the utility model additionally provides a kind of switch toning LED drive system, the system bag
Include：AC power, the input switch for being electrically connected with the AC power, the electric connection AC power and the input are opened
The total lamp string of constant-flow driver, LED of pass and the output capacitance for being connected in parallel on the total lamp string both ends of the LED, the total lamp string bags of the LED
Include multiple LED strings of series connection；Characterized in that, the system further comprises switch toning control described in the utility model
Circuit；An output end and the total lamps of the LED for the constant-flow driver is electrically connected in the switch toning control circuit
The positive and negative end of string.
The utility model has the advantage of, after the switch motion of input switch is detected, pretreatment operation is first carried out,
By the charge discharging resisting stored in output capacitance to safety value, operation to be pre-treated is completed and then changed on off state, avoids
The damage that output capacitance sparks to LED string and/or control circuit when on off state switches, improve switch toning control
The Performance And Reliability of circuit.
Brief description of the drawings
Fig. 1, the schematic diagram of existing switch toning series LED drive circuit；
Fig. 2 is the interdependent node oscillogram of circuit shown in Fig. 1；
Fig. 3, the configuration diagram of the switch toning embodiment of LED drive system one described in the utility model；
Fig. 4, the circuit diagram of the embodiment of pretreatment module one described in the utility model；
Fig. 5 is the interdependent node oscillogram of system shown in Figure 3；
Fig. 6, the circuit diagram of another embodiment of pretreatment module described in the utility model.
Embodiment
Below in conjunction with the accompanying drawings to switch toning control circuit provided by the utility model, chip and switch toning LED drivings
System elaborates.
With reference to figure 3-5, wherein, Fig. 3 is the framework of the switch toning embodiment of LED drive system one described in the utility model
Schematic diagram；Fig. 4 is the circuit diagram of the embodiment of pretreatment module one described in the utility model；Fig. 5 is the correlation of system shown in Figure 3
Node waveform figure.
As shown in figure 3, described switch toning LED drive system includes：AC power AC, it is electrically connected with the alternating current
Source AC input switch S1, the electric connection AC power AC and input switch S1 constant-flow driver 31, LED is total
Lamp string 33 and the output capacitance C0 being connected in parallel between the positive and negative end of the total lamp strings 33 of the LED.AC power AC is generally city
Electricity, the ends of input switch S1 mono- are connected on AC power AC, and other end connects constant-flow driver 31；Constant-flow driver 31 is by input
AC power changes into constant current source, multiple LED strings of output to series connection；The positive and negative output end of constant-flow driver 31 it
Between be typically parallel with output capacitance C0, namely output capacitance C0 is connected between the positive and negative end of the total lamp strings 33 of LED；The total lamps of LED
String 33 includes multiple LED strings of series connection.The present embodiment illustrates by taking two LED strings LED1, LED2 connecting as an example；
In other embodiments, the total lamp strings 33 of LED can include the two or more LED string of series connection, and the connection of its circuit and control mode can
With reference to the present embodiment.
As shown in figure 3, described 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 strings 33 of the LED；The switch
Toning control circuit 32 includes：Switch detection module 321, control module 322 and pretreatment module 323.
The switch detection module 321, for detecting switch motion and the output switch confirmation letter of the input switch S1
Number.For example, input switch S1 high level, which represents input switch S1, is in closure state, switch confirmation signal is high level；It is defeated
The low level for entering to switch S1 represents input switch S1 and is off, and switch confirmation signal is low level.
The control module 322, for receiving the switch confirmation signal, with the current state according to each LED string
Next state, and output switch state switching signal are prejudged with the switch confirmation signal.
The pretreatment module 323, for receiving the on off state switching signal, to be switched according to the on off state
Signal carries out pretreatment action and returns to pretreatment completion signal to the control module 323, and the pretreatment action includes will
The total both end voltage VIN of lamp string 33 of LED (voltage on i.e. described output capacitance C0) are discharged to a voltage threshold.
The control module 322, it is further used for after receiving the pretreatment and completing signal, exports corresponding driving
Signal, the drive signal is used to the multiple at least one of LED string LED1, LED2 is lighted or turned off, to adjust
State the colour temperature of the total lamp strings 33 of LED.
Because before the change of multiple LED string access ways of series connection, pretreatment module 323 has completed beam worker
Make, afterwards the high current of output capacitance will not be caused to spark so changing multiple LED string access ways of series connection, avoided
High current causes the possibility that LED string and/or control chip damage, improve switch toning control circuit performance and can
By property.
The preferable switch toning control circuit 32 also includes switch module 324, and the switch module 324 includes multiple
Submodule is switched, each switch submodule is respectively used to receive a corresponding drive signal to control a corresponding LED string
Light or turn off, so as to realize the different access ways of multiple LED strings to adjust the colour temperature of the total lamp strings of LED.
The present embodiment illustrates by taking two switches K1, K2 connecting as an example；In other embodiments, switch module 324
The two or more switch of series connection can be included, the connection of its circuit and control mode can refer to the present embodiment.Switch K1 first end
It is electrically connected with LED string LED1 first end, the drive signal D1 that control terminal receive and control module 322 exports；Switch the of K2
Two ends are electrically connected with LED string LED2 the second end, the drive signal D2 that control terminal receive and control module 322 exports；Series connection
Switch K1 is electrically connected with the LED string LED1 to connect, LED string LED2 common port with switching K2 common port.Switch K1, K2
Corresponding drive signal is received to close or turn off, realizes LED string LED1, LED2 different access ways.For example, driving letter
Number D1 is that height represents K1 disconnections, and LED1 series connection accesses are lit, and represent K1 closures to be low, LED1 is turned off；Drive signal D2 is
Gao represents K2 disconnections, and LED2 series connection accesses are lit, and represents K2 closures to be low, LED2 is turned off.Specific switch K1, K2 can be with
For power switch pipe, the power switch pipe is closed according to the drive signal of reception to control corresponding LED string to light, or according to
The drive signal of reception is turned off to control corresponding LED string to turn off.
As shown in figure 4, the pretreatment 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, the voltage on the output capacitance C0 is 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 the first resistor R1 and second resistance R2 of series connection；The of the first resistor R1
One end is electrically connected with the output capacitance C0, the second end ground connection of the second resistance R2, the first resistor R1 and described the
Two resistance R2 common port is electrically connected with the positive input of the operational amplifier OP1, to detect and sample output capacitance C0
On voltage VIN obtain voltage detection signal.Specifically, the magnitude of voltage of voltage detection signal is：VIN*R2/(R1+R2).
It should be noted that because output capacitance C0 is connected in parallel on the total both ends of lamp string 33 of LED, detects and sample output capacitance C0
On voltage VIN, as detect and sample the voltage at the total both ends of lamp string 33 of LED.
The operational amplifier OP1, positive input are used to receive the voltage detection signal, and reverse input end is used to connect
Reference voltage signal VREF is received, enabled input EN is used to receive the on off state switching signal, output end output electric discharge control
Signal processed.(enabled input EN is enabled), operational amplifier when the on off state switching signal that control module 322 exports is effective
OP1 is started working, 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, to control control of discharge unit 402 to start or stop to discharge to 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 discharges.Specifically, when the magnitude of voltage of voltage detection signal is more than or equal to reference voltage signal VREF magnitude of voltage, electric discharge
Control unit 402 starts to discharge to output capacitance C0；When the magnitude of voltage of voltage detection signal is less than reference voltage signal VREF's
During magnitude of voltage, control of discharge unit 402 stops discharging to output capacitance C0.Specifically, the control of discharge unit 402 includes work(
Rate metal-oxide-semiconductor M1, the power MOS pipe M1 first end are electrically connected with the output capacitance C0, and the second end is grounded, and control terminal is electrical
Connect the output end of the operational amplifier OP1；The power MOS pipe M1 is used to be led according to the discharge control signal of reception
Pass to and start to discharge to the output capacitance C0, or turned off according to the discharge control signal of reception to stop to the output
Electric capacity C0 discharges.
Unit 403 is completed in the pretreatment, and the voltage threshold is clamped at for the voltage on the output capacitance C0
After value, output pretreatment completes signal to the control module 322.Optionally, unit 403 is completed in the pretreatment includes a meter
When device T1, the timer T1 start timing after the on off state switching signal is received, and export at the end of timing pre-
Processing completes signal to the control module 322.
That is, in the present embodiment, when the on off state switching signal that control module 322 exports is effective, operational amplifier
OP1 starts working, and regulation power MOS pipe M1 grid voltage discharges output capacitance C0, while timer T1 starts timing.It is defeated
The voltage VIN gone out on electric capacity C0 is detected and sampled by voltage detection unit 401, and is carried out with default reference voltage signal VREF
Compare.When VIN*R2/ (R1+R2) is more than or equal to VREF while being more than or equal to VREF* (R1+R2)/R2 (namely VIN), power MOS
Pipe M1 is turned on, and 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 shut-off, stop to output capacitance C0 discharge.Feedback control loop makes voltage on output capacitance C0 most
VREF* (R1+R2)/R2 is clamped at eventually, namely the voltage threshold is fixed setting value：VREF*(R1+R2)/R2；Wherein,
VREF is the magnitude of voltage 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
Understood with reference to Fig. 3-5, different LEDs concatenation is fashionable, and the voltage on output capacitance C0 can all first drop to setting
Value V0=VREF* (R1+R2)/R2.In diagram, input switch S1 high level represents input switch S1 and is in closure state, low
Level representative input switch S1 is off.LED string LED1 drive signal D1 is driven to be disconnected for high representation switch K1,
LED string LED1 series connection accesses are lit, and are closed for low representation switch K1, LED string LED1 is turned off.Drive LED string
LED2 drive signals D2 is disconnected for high representation switch K2, and LED string LED2 series connection accesses are lit, and are closed for low representation switch K2
Close, LED string LED2 is turned off.VIN represents voltage (namely the electricity between the positive and negative end of the total lamp strings of LED on output capacitance C0
Pressure).During input switch S1 is closed, if only LED1 series connections are fashionable, the voltage on output capacitance C0 is V1；If only
LED2 series connections are 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 gone out on electric capacity C0 is V3 (V3=V1+V2).During input switch S1 disconnects, pretreatment module 323 is by output capacitance
Voltage on C0 is discharged to V0 (V0=VREF* (R1+R2)/R2) in advance, when then wait input switch S1 is closed again, output
Voltage on electric capacity C0 rises to corresponding desired value (relevant voltage V1, V2, V3) from V0.For example, connect from LED1 and LED2
Enter to only LED1 connect access switching when (i.e. when VIN switches from V3 to V1), electric charge on output capacitance C0 is by advance from putting
Electric V3 to V0, then rises to V1 from V0.That is, output capacitance C0 discharge current is by the electric discharge inside pretreatment module 323
Control unit 402 limits, and will not produce high current, protects LED string and/or control circuit to be hardly damaged.
It is the circuit diagram of another embodiment of pretreatment module described in the utility model with reference to figure 6, with implementation shown in Fig. 4
The difference of example is, in the present embodiment, voltage threshold is the particular value according to caused by off state switching signal.Specifically
, the pretreatment module 323 is additionally arranged reference voltage signal generator 601.The reference voltage signal generator 601, it is defeated
Enter end and receive the on off state switching signal, output end is electrically connected with the reverse input end of the operational amplifier OP1, is used for
Corresponding reference voltage signal is produced according to the on off state switching signal and exported so that the voltage threshold is with switching shape
The value of target voltage correlation after state switching.
Switch toning control circuit in switch toning LED drive system provided by the utility model, is detecting input
After the switch motion of switch, pretreatment operation is first carried out, by the charge discharging resisting stored in output capacitance to safety value, treats pre- place
On off state is completed and then changed in reason operation, and output capacitance sparks to LED string when avoiding on off state switching
And/or the damage of control circuit, improve the Performance And Reliability for switching toning control circuit.
The utility model additionally provides a kind of switch toning control chip, described suitable for switch toning LED drive system
System includes：AC power AC, the input switch S1 for being electrically connected with the AC power AC, it is electrically connected with the AC power AC
And the input switch S1 the total lamp string 33 of constant-flow driver 31, LED and be connected in parallel on the positive and negative of the total lamp strings 33 of the LED
Output capacitance C0 between end, the total lamp strings 33 of LED include multiple LED strings of series connection.Set on the packaging body of the chip
There are DET pins, VIN pins, GND pin and an at least SW pins, the chip internal is provided with described in the utility model open
Close 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 with the DET pins, lead to
Cross the switch motion that the DET pins detect the input switch S1；The pretreatment module of the switch toning control circuit 32
323 are electrically connected with the VIN pins, by the VIN pins by the tension discharge on the output capacitance C0 a to voltage threshold
Value.When the switch toning control circuit 32 includes switch module 324, the switch module 324 is electrically connected described
VIN pins, GND pin and corresponding SW pins, lighting or turning off for corresponding LED string is controlled by corresponding SW pins.
Preferably, the switch module 324 includes the switch submodule of multiple series connection, and the first of first switch submodule
End is electrically connected with the VIN pins, and the second end of last switch submodule is electrically connected with the GND pin, two neighboring
The common port for switching submodule is electrically connected with a SW pins.Shown in reference picture 3, in two switches K1, K2 of series connection, switch K1's
First end is electrically connected with VIN pins, to be electrically connected with LED string LED1 first end (namely total lamp strings of LED by VIN pins
Anode), control terminal receive and control module 322 export drive signal D1；The second end for switching K2 is electrically connected with GND pin,
To be electrically connected with LED string LED2 the second end (namely negative terminal of the total lamp strings of LED) by GND pin, control terminal receives control
The drive signal D2 that module 322 exports；The switch K1 of series connection and switch K2 common port are electrically connected with SW pins, to be drawn by SW
Pin is electrically connected with the LED string LED1 of series connection, LED string LED2 common port.Switch K1, K2 receive corresponding drive signal with
Closure or shut-off, realize LED string LED1, LED2 different access ways.
Described above is only preferred embodiment of the present utility model, it is noted that for the common skill of the art
Art personnel, on the premise of the utility model principle is not departed from, some improvements and modifications can also be made, these improvements and modifications
Also it should be regarded as the scope of protection of the utility model.
Claims (12)
1. one kind switch toning control circuit, suitable for switch toning LED drive system, the system includes：AC power, electricity
Property the connection AC power input switch, be electrically connected with the constant current driving of the AC power 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 strings of the LED, the total lamp strings of LED include
Multiple LED strings of series connection；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 strings of LED, the circuit include：
Detection module is switched, for detecting switch motion and the output switch confirmation signal of the input switch；
Control module, it is true with the current state according to each LED string and the switch for receiving the switch confirmation signal
Recognize signal and prejudge next state, and output switch state switching signal；
Pretreatment module, it is pre- to be carried out according to the on off state switching signal for receiving the on off state switching signal
Processing, which acts and returns to pretreatment, completes signal to the control module, and the pretreatment action is including by the output capacitance
Tension discharge to a voltage threshold；
The control module is further used for after receiving the pretreatment and completing signal, exports corresponding drive signal, institute
State drive signal to be used at least one of the multiple LED string is lighted or turned off, to adjust the color of the total lamp strings of the LED
Temperature.
2. circuit according to claim 1, it is characterised in that the circuit also includes switch module, the switch module
Including multiple switch submodule, each switch submodule is respectively used to receive a corresponding drive signal one corresponding to control
LED string being lighted or turning off, so as to realize the different access ways of multiple LED strings to adjust the colour temperature of the total lamp strings of LED.
3. circuit according to claim 2, it is characterised in that the switch submodule includes power switch pipe, the work(
Rate switching tube is closed according to the drive signal of reception to control corresponding LED string to light, or is turned off according to the drive signal of reception
To control corresponding LED string to turn off.
4. circuit according to claim 1, it is characterised in that the pretreatment module includes：
Voltage detection unit, for detecting the voltage in the output capacitance and voltage sense signal；
Operational amplifier, positive input are used to receive the voltage detection signal, and reverse input end is used to receive reference voltage
Signal, enabled input are used to receive the on off state switching signal, output end output discharge control signal；
Control of discharge unit, for receiving the discharge control signal, to start or stop to discharge to the output capacitance；
The voltage detection unit, operational amplifier, control of discharge unit and output capacitance composition feedback control loop make described defeated
The voltage gone out on electric capacity is clamped at the voltage threshold；
Unit is completed in pretreatment, after being clamped at the voltage threshold for the voltage in the output capacitance, exports pre- place
Reason completes signal to the control module.
5. circuit according to claim 4, it is characterised in that the voltage detection unit include series connection first resistor and
Second resistance；
The first end of the first resistor is electrically connected with the output capacitance, the second end ground connection of the second resistance, and described the
One resistance and the common port of the second resistance are electrically connected with the positive input of the operational amplifier.
6. circuit according to claim 5, it is characterised in that the voltage threshold is：
VREF*(R1+R2)/R2
Wherein, VREF is the magnitude of voltage 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.
7. circuit according to claim 4, it is characterised in that the pretreatment module further comprises：Reference voltage is believed
Number generator；
The reference voltage signal generator, input receive the on off state switching signal, described in output end is electrically connected with
The reverse input end of operational amplifier, for producing corresponding reference voltage signal and defeated according to the on off state switching signal
Go out so that the voltage threshold is the value related to the target voltage after on off state switching.
8. circuit according to claim 4, it is characterised in that the control of discharge unit includes power MOS pipe, the work(
The first end of rate metal-oxide-semiconductor is electrically connected with the output capacitance, the second end ground connection, and control terminal is electrically connected with the operational amplifier
Output end；
The power MOS pipe is used to be turned on according to the discharge control signal of reception to start to discharge to the output capacitance,
Or turned off according to the discharge control signal of reception to stop discharging to the output capacitance.
9. circuit according to claim 4, it is characterised in that unit is completed in the pretreatment includes a timer, described
Timer starts timing after the on off state switching signal is received, and output pretreatment completes signal extremely at the end of timing
The control module.
10. one kind switch toning control chip, suitable for switch toning LED drive system, the system includes：AC power,
The input switch for being electrically connected with the AC power, the constant current driving for being electrically connected with the AC power 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 strings of the LED, the total lamp strings of LED include
Multiple LED strings of series connection；Characterized in that, the packaging body of the chip be provided with DET pins, VIN pins, GND pin with
And an at least SW pins, the chip internal are provided with the switch toning control circuit described in claim 1-9 any one；
The switch detection module of the switch toning control circuit is electrically connected with the DET pins, is detected by the DET pins
The switch motion of the input switch；
The pretreatment module of the switch toning control circuit is electrically connected with the VIN pins, by the VIN pins by described in
Tension discharge in output capacitance is to a voltage threshold；
When it is described switch toning control circuit include switch module when, the switch module be electrically connected the VIN pins,
GND pin and corresponding SW pins, lighting or turning off for corresponding LED string is controlled by corresponding SW pins.
11. chip according to claim 10, it is characterised in that the switch module includes the switch submodule of multiple series connection
Block, the first end of first switch submodule are electrically connected with the VIN pins, and the second end of last switch submodule is electrical
The GND pin is connected, the common port of two neighboring switch submodule is electrically connected with a SW pins.
12. one kind switch toning LED drive system, the system include：AC power, it is electrically connected with the defeated of the AC power
Enter switch, the total lamp string of constant-flow driver, LED for being electrically connected with the AC power and the input switch and be connected in parallel on institute
The output capacitance at the total lamp string both ends of LED is stated, the total lamp strings of LED include multiple LED strings of series connection；It is characterized in that, described
System further comprises the switch toning control circuit described in claim 1-9 any one；
An output end and the total lamp strings of the LED for the constant-flow driver is electrically connected in the switch toning control circuit
Positive and negative end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720824176.8U CN206993459U (en) | 2017-07-10 | 2017-07-10 | Switch toning control circuit, chip and switch toning LED drive system |
Applications Claiming Priority (1)
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| CN201720824176.8U CN206993459U (en) | 2017-07-10 | 2017-07-10 | Switch toning control circuit, chip and switch toning LED drive system |
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| CN206993459U true CN206993459U (en) | 2018-02-09 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107172763A (en) * | 2017-07-10 | 2017-09-15 | 上海晶丰明源半导体股份有限公司 | Switch toning control circuit, chip, method and switch toning LED drive system |
| CN112004283A (en) * | 2020-09-09 | 2020-11-27 | 陕西亚成微电子股份有限公司 | LED drive control method and circuit |
| WO2022198731A1 (en) * | 2021-03-22 | 2022-09-29 | 宁波亚茂光电股份有限公司 | Led control circuit and illumination system |
-
2017
- 2017-07-10 CN CN201720824176.8U patent/CN206993459U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107172763A (en) * | 2017-07-10 | 2017-09-15 | 上海晶丰明源半导体股份有限公司 | Switch toning control circuit, chip, method and switch toning LED drive system |
| CN107172763B (en) * | 2017-07-10 | 2019-03-08 | 上海晶丰明源半导体股份有限公司 | Switch toning control circuit, chip, method and switch toning LED drive system |
| CN112004283A (en) * | 2020-09-09 | 2020-11-27 | 陕西亚成微电子股份有限公司 | LED drive control method and circuit |
| CN112004283B (en) * | 2020-09-09 | 2021-11-23 | 陕西亚成微电子股份有限公司 | LED drive control method and circuit |
| WO2022198731A1 (en) * | 2021-03-22 | 2022-09-29 | 宁波亚茂光电股份有限公司 | Led control circuit and illumination system |
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