CN102281686A - Compensation control device for LED (Light Emitting Diode) lamp during rapid falling of input voltage and method thereof - Google Patents
Compensation control device for LED (Light Emitting Diode) lamp during rapid falling of input voltage and method thereof Download PDFInfo
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Abstract
The invention discloses a compensation control device for an LED (Light Emitting Diode) lamp during the rapid falling of the input voltage and a method thereof. The compensation control device disclosed by the invention comprises a controller, wherein the controller comprises a detection unit, a PWM (Pulse Width Modulation) signal output unit, a storage unit and a central processing unit; the detection unit detects the input voltage and output voltage of a flyback DC (Direct Current)-DC converter; the PWM signal output unit outputs PWM signals to the flyback DC-DC converter; the storage unit stores a starting compensation threshold when the input voltage of the DC-DC converter falls to the input voltage for starting compensation; and the central processing unit controls the duty ratio of the PMW signals. The method disclosed by the invention comprises the following steps: collecting the input voltage and output voltage of the flyback DC-DC converter in real time through the controller; judging that an operating mode of the DC-DC converter is in a continuous current mode and an interrupted current mode or not; and outputting the PMW signals with the corresponding duty ratio to the flyback DC-DC converter according to the judgment result. In the invention, the input voltage of the LED lamp can be rapidly adjusted to a normal value when rapidly falling.
Description
Technical field
The present invention relates to the Drive Control Technique of LED lamp, relate in particular to compensate control apparatus and the compensating control method thereof of LED lamp when input voltage falls fast.
Background technology
In present LED constant-current control circuit, when LED lamp string was lighted, single-chip microcomputer was an input voltage of adjusting the LED lamp by the PI algorithm.When the situation that input voltage falls fast takes place when, rely on the PI algorithm of single-chip microcomputer in the very short time (less than 1ms), stable value will be got back in this input voltage adjustment, particularly in the output light modulation, this can cause human eye to observe the flicker of LED lamp brightness.
Summary of the invention
Technical problem to be solved by this invention is to provide compensate control apparatus and the compensating control method thereof of LED lamp when input voltage falls fast, when its input voltage at the LED lamp drops fast, this input voltage promptly can be adjusted to normal value.
The technical solution adopted in the present invention is: the compensate control apparatus of a kind of LED lamp when input voltage falls fast, and described LED lamp comprises power supply input circuit and constant-current circuit; Described power supply input circuit comprises power module and the inverse-excitation type DC-DC converter that order is electrically connected; Be characterized in that described compensate control apparatus comprises a controller; Described controller comprises: detecting unit, the first pwm signal output unit, memory cell and CPU; Wherein:
Described detecting unit is used to detect the input voltage and the output voltage of described inverse-excitation type DC-DC converter, and testing result is sent to described CPU;
The described first pwm signal output unit is used for to described inverse-excitation type DC-DC converter output pwm signal;
Described memory cell, the input voltage that is used to store predefined inverse-excitation type DC-DC converter drop into the input voltage that begins to start compensation and start the compensation threshold value;
Described CPU, the input voltage testing result that is used for inverse-excitation type DC-DC converter that described detecting unit is sent starts the compensation threshold value with the input voltage of predefined inverse-excitation type DC-DC converter and compares, and the input voltage the startup whether input voltage of judging inverse-excitation type DC-DC converter drops to predefined inverse-excitation type DC-DC converter compensates below the threshold value; If dropping to the input voltage of this inverse-excitation type DC-DC converter starts below the compensation threshold value, the operating state of then judging inverse-excitation type DC-DC converter is in continuous current mode of operation or interrupted current mode of operation, and controls the described first pwm signal output unit is exported pwm signal from corresponding duty ratio to described inverse-excitation type DC-DC converter according to judged result.
The invention also discloses the compensating control method of a kind of LED lamp when input voltage falls fast, described LED lamp comprises power supply input circuit and constant-current circuit; Described power supply input circuit comprises power module and the inverse-excitation type DC-DC converter that order is electrically connected; This voltage compensation control method may further comprise the steps:
The input voltage that preestablishes inverse-excitation type DC-DC converter drops into the input voltage startup compensation threshold value that begins to start compensation;
Detect the input voltage and the output voltage of described inverse-excitation type DC-DC converter;
Controller compares the input voltage testing result and the predefined input voltage startup compensation threshold value of inverse-excitation type DC-DC converter, judges whether the input voltage of inverse-excitation type DC-DC converter drops to below the predefined input voltage startup compensation threshold value;
Dropped to below the predefined input voltage startup compensation threshold value if this controller is judged the input voltage of described inverse-excitation type DC-DC converter, then this controller judges that again the operating state of described inverse-excitation type DC-DC converter is in continuous current mode of operation or interrupted current mode of operation;
Controller is exported the pwm signal of corresponding duty ratio according to the current working mode of the inverse-excitation type DC-DC converter of judging to described inverse-excitation type DC-DC converter, makes the output voltage of inverse-excitation type DC-DC converter return to normal value.
After adopting technique scheme, detect the input voltage of DC-DC converter by controller, start the compensation threshold value when following when detecting input voltage that input voltage drops into the DC-DC converter fast, increase the duty ratio of the PWM drive signal of inverse-excitation type DC-DC converter at once, output voltage with rapid adjustment inverse-excitation type DC-DC converter, thereby make the adjustment time of LED electric current shorten to 400us～500us, avoided human eye to observe the flicker of LED lamp brightness effectively.
Description of drawings
Concrete structure of the present invention is further described by following embodiment and accompanying drawing thereof.
Fig. 1 shows the circuit block diagram of an embodiment of compensate control apparatus of the present invention.
Fig. 2 is the theory diagram of an embodiment of CPU of the present invention.
Fig. 3 is the theory diagram of an embodiment of constant-current circuit of the present invention.
Fig. 4 shows correction voltage value A and the electric current I of an embodiment among the present invention
OutBetween graph of relation.
Fig. 5 is the flow chart of an embodiment of a kind of voltage compensation control method when LED lamp input voltage falls fast of the present invention.
Embodiment
The circuit block diagram of the compensate control apparatus of the LED of being lamp shown in Figure 1 when input voltage falls fast.Described LED lamp comprises power module 1, inverse-excitation type DC-DC converter 2 and constant-current circuit 4.Wherein, the input of inverse-excitation type DC-DC converter 2 is electrically connected with the output of power module 1, and output is electrically connected with the positive terminal of LED lamp 3, and being used for provides work required voltage to the LED lamp.The output of constant-current circuit 4 is electrically connected with the negative pole end of LED lamp 3, is used for providing constant electric current to LED lamp 3.Compensate control apparatus of the present invention comprises a controller 5, and an output of controller 5 is electrically connected with the control end of inverse-excitation type DC-DC converter 2, and another output of this controller is electrically connected with the input of the constant-current circuit 4 of LED lamp.
Please continue to consult Fig. 1.Controller 5 described in the present embodiment comprises the first pwm signal output unit 51, the second pwm signal output unit 52, current switching signal output unit 53, memory cell 54, CPU 55 and detecting unit 56.
The first pwm signal output unit 51 under the control of CPU 55 to inverse-excitation type DC-DC converter 2 output pwm signals.The second pwm signal output unit 52 is under the control of CPU 55, to constant-current circuit 4 output pwm signals of LED lamp.Current switching signal output unit 53 is under the control of CPU 55, to constant-current circuit 4 output current start signal or failure of current signal, with the break-make of control LED lamp operating current.The input voltage that memory cell 54 stores predefined inverse-excitation type DC-DC converter drops into the input voltage startup compensation threshold value that begins to start compensation.Detecting unit 56 is used for the input voltage and the output voltage of inverse-excitation type DC-DC converter 2 are detected sampling, and testing result is sent to CPU 55.CPU 55 compares the input voltage testing result of the inverse-excitation type DC-DC converter of detecting unit 56 transmissions and the input voltage startup compensation threshold value of predefined inverse-excitation type DC-DC converter, judges whether the input voltage of inverse-excitation type DC-DC converter drops to below the input voltage startup compensation threshold value of predefined inverse-excitation type DC-DC converter; If dropping to the input voltage of this inverse-excitation type DC-DC converter starts below the compensation threshold value, the operating state of then judging inverse-excitation type DC-DC converter 2 is in continuous current mode of operation or interrupted current mode of operation, and controls the pwm signal of the first pwm signal output unit 51 to the corresponding duty ratio of inverse-excitation type DC-DC converter 2 outputs according to judged result.
As shown in Figure 3, described CPU 55 further comprises voltage falling judgment sub-unit 551, converter operating state judgment sub-unit 552 and duty ratio computation subunit 553.
Voltage falling judgment sub-unit 551 is detecting unit 56 testing result that sends and the input voltage that is stored in the DC-DC converter in the memory cell 54 to be started the compensation threshold value compare, the input voltage that drops to this DC-DC converter at the input voltage of inverse-excitation type DC-DC converter 2 starts the compensation threshold value when following, sends a converter operating state variable signal to converter operating state judgment sub-unit 552.
Converter operating state judgment sub-unit 552 is calculated respectively after receiving converter operating state variable signal
Long-pending and
Long-pending, and result of calculation compared; If
Long-pending greater than
Long-pending, judge that then inverse-excitation type DC-DC converter 2 is in the continuous current mode of operation, otherwise, judge that inverse-excitation type DC-DC converter 2 is in the interrupted current mode of operation, and notify duty ratio computation subunit 553 judged result; Wherein, f is the operating frequency of inverse-excitation type DC-DC converter 2, I
OutBe the output current of inverse-excitation type DC-DC converter, f and I
OutValue preestablish by controller 5.V
InBe the input voltage startup compensation threshold value of predefined inverse-excitation type DC-DC converter 2, V
OutStart the output voltage of compensation threshold value when following for inverse-excitation type DC-DC converter 2 drops to predefined input voltage at its input voltage, A is a correction voltage value, A=(23-10 * I
Out)/9, wherein, I
OutMore than or equal to 0.5A and smaller or equal to 1.4A; I
OutDuring for 1.4A, A=1V, I
OutDuring for 0.5A, A=2V.I
OutAt 0.5A between the 1.4A, according to linear change; A and I
OutBetween relation as shown in Figure 4; L
pLimit, source magnetizing inductance for inverse-excitation type DC-DC converter 2.
If inverse-excitation type DC-DC converter 2 is in the continuous current mode of operation, then the duty ratio computation subunit 553 controls first pwm signal output unit 51 output duty cycles are the control end of the pwm signal of D1 to inverse-excitation type DC-DC converter 2; Wherein,
; V
InBe the input voltage startup compensation threshold value of predefined inverse-excitation type DC-DC converter, V
OutStart the output voltage of compensation threshold value when following for inverse-excitation type DC-DC converter drops to predefined input voltage at its input voltage, n is limit, the source number of turn N of the transformer of inverse-excitation type DC-DC converter
pWith secondary number of turn N
sRatio, n=N
s/ N
pBe in the interrupted current mode of operation if judge inverse-excitation type DC-DC converter 2, then controlling the first pwm signal output unit, 51 output duty cycles is the control end of the pwm signal of D2 to inverse-excitation type DC-DC converter 2; Wherein,
; V
InAfterDropBe the input voltage of inverse-excitation type DC-DC converter after its input voltage drops to below the predefined input voltage startup compensation threshold value, V
InBeforeDropBe the input voltage before inverse-excitation type DC-DC converter is below its input voltage drops to predefined input voltage startup compensation threshold value, D
BeforeDropBe the duty ratio of inverse-excitation type DC-DC converter 2 before its input voltage drops to below the predefined input voltage startup compensation threshold value.
Fig. 3 shows the circuit block diagram of constant-current circuit 4 according to an embodiment of the invention.Constant-current circuit 4 comprises filter circuit 41, comparator 42, power driving circuit 43, switching circuit 44, first current-limiting circuit 45, second current-limiting circuit 46 and current sampling circuit 47.The input of filter circuit 41 is electrically connected with the second pwm signal output unit 52, and output is electrically connected with the first input end of comparator 42; Second input of comparator 42 is electrically connected with the output of first current-limiting circuit 45, the input of first current-limiting circuit 45 is electrically connected with current switching signal output unit 53, the output of this comparator 42 is electrically connected with the input of power driving circuit 43, and the output of power driving circuit 43 is electrically connected with the input of switching circuit 44; First output of switching circuit 44 is electrically connected with the negative pole end of LED lamp 3, second output of switching circuit 44 is electrically connected with the input of second current-limiting circuit 46, the output of second current-limiting circuit 46 is electrically connected with second input of comparator 42, and second output of this switching circuit 44 also is electrically connected with current sampling circuit 47.
In the embodiment shown in fig. 4, switching circuit 44 mainly is made of a NMOS pipe, power driving circuit 43 is an OTL power amplification circuit, and comparator 42 mainly is made of operational amplifier, and first current-limiting circuit 45, second current-limiting circuit 46 and current sampling circuit 47 are formed by a resistance.The drain electrode that constitutes the NMOS pipe of switching circuit 44 is electrically connected with the negative pole end of LED lamp 3, source electrode is electrically connected by the end of oppisite phase of resistance that constitutes second current-limiting circuit 46 and the operational amplifier that constitutes comparator 42, and this source electrode is also by constituting the grounding through resistance of current sampling circuit 47.The fixed duty signal that the second pwm signal output unit 52 produces generates the positive terminal that stable voltage outputs to the operational amplifier that constitutes comparator 42 by filter circuit 41, and this voltage is used for determining the electric current of constant-current circuit.Controller 5 is by the switch of current switching signal output unit 53 control constant-current circuits.When current switching signal output unit 53 was set to export high level, constant-current control circuit was closed.When current switching signal output unit 53 was set to input state (high-impedance state), constant-current circuit was opened.
In one embodiment, controller 5 can be made of a single-chip microcomputer.
As shown in Figure 5, compensating control method of the present invention may further comprise the steps:
Step S1, the input voltage that preestablishes inverse-excitation type DC-DC converter drop into the input voltage startup compensation threshold value that begins to start compensation;
Step S2 detects the input voltage and the output voltage of inverse-excitation type DC-DC converter 2 in real time;
Step S3, controller 5 compares the input voltage testing result of inverse-excitation type DC-DC converter 2 and the input voltage startup compensation threshold value of predefined inverse-excitation type DC-DC converter, judges whether the input voltage of inverse-excitation type DC-DC converter 2 drops to below the input voltage startup compensation threshold value of predefined inverse-excitation type DC-DC converter;
Step S4, if the input voltage of DC-DC converter 2 drops to the input voltage of predefined inverse-excitation type DC-DC converter and starts below the compensation threshold value, then controller 5 judges that the operating state of inverse-excitation type DC-DC converter 2 is in continuous current mode of operation or interrupted current mode of operation;
In this step S4, controller 5 judges that the operating state of inverse-excitation type DC-DC converter 2 is in continuous current mode of operation or interrupted current mode of operation, further comprises:
A. calculation procedure: controller 5 calculates respectively
Long-pending and
Long-pending;
Wherein, f is the operating frequency of inverse-excitation type DC-DC converter 2, I
OutBe the output current of inverse-excitation type DC-DC converter 2, f and I
OutValue preestablish by controller 5.V
InBe the input voltage startup compensation threshold value of predefined inverse-excitation type DC-DC converter 2, V
OutStart the output voltage of compensation threshold value when following for inverse-excitation type DC-DC converter 2 drops to input voltage at its input voltage, A is a correction voltage value, A=(23-10 * I
Out)/9, wherein, I
OutMore than or equal to 0.5A and smaller or equal to 1.4A; I
OutDuring for 1.4A, A=1V, I
OutDuring for 0.5A, A=2V.I
OutAt 0.5A between the 1.4A, according to linear change; A and I
OutBetween relation as shown in Figure 4; L
pLimit, source magnetizing inductance for the transformer of inverse-excitation type DC-DC converter 2;
B. compare determining step: will
Long-pending with
Long-pending comparing, if
Long-pending greater than
Long-pending, then controller 5 judges that inverse-excitation type DC-DC converters 2 are in the continuous current mode of operation, otherwise controller 5 judges that inverse-excitation type DC-DC converters 2 are in the interrupted current mode of operation.
Step S5, controller 5 export the pwm signal of corresponding duty ratio to inverse-excitation type DC-DC converter 2 according to the judged result of step S4.
In this step S5, be in the continuous current mode of operation if judge inverse-excitation type DC-DC converter 2, then controller 5 output duty cycles are the control end (be the grid of the source limit metal-oxide-semiconductor of inverse-excitation type DC-DC converter 2) of the pwm signal of D1 to inverse-excitation type DC-DC converter 2; Wherein,
; V
InBe the input voltage startup compensation threshold value of predefined inverse-excitation type DC-DC converter 2, V
OutStart the output voltage of compensation threshold value when following for inverse-excitation type DC-DC converter 2 drops to predefined input voltage at its input voltage, n is limit, the source number of turn N of the transformer of inverse-excitation type DC-DC converter
pWith secondary number of turn N
sRatio, n=N
s/ N
p
Be in the interrupted current mode of operation if judge inverse-excitation type DC-DC converter 2, then controller 5 output duty cycles are the control end of the pwm signal of D2 to inverse-excitation type DC-DC converter; Wherein,
; V
InAfterDropBe the input voltage of inverse-excitation type DC-DC converter 2 after its input voltage drops to below the predefined input voltage startup compensation threshold value, V
InBeforeDropBe the input voltage before inverse-excitation type DC-DC converter is below its input voltage drops to predefined input voltage startup compensation threshold value, D
BeforeDropBe the duty ratio of inverse-excitation type DC-DC converter 2 before its input voltage drops to below the predefined input voltage startup compensation threshold value.
The above is the explanation of illustrative only, and is not to be restriction the present invention.Any technical staff in the art, without departing from the spirit and scope of the present invention, the improvement and the adjustment of the unsubstantiality that the present invention is made must belong to protection scope of the present invention.
Claims (9)
1. the compensate control apparatus of a LED lamp when input voltage falls fast, described LED lamp comprises power supply input circuit and constant-current circuit; Described power supply input circuit comprises power module and the inverse-excitation type DC-DC converter that order is electrically connected; It is characterized in that described compensate control apparatus comprises a controller; Described controller comprises: detecting unit, the first pwm signal output unit, memory cell and CPU; Wherein:
Described detecting unit is used to detect the input voltage and the output voltage of described inverse-excitation type DC-DC converter, and testing result is sent to described CPU;
The described first pwm signal output unit is used for to described inverse-excitation type DC-DC converter output pwm signal;
Described memory cell, the input voltage that is used to store predefined inverse-excitation type DC-DC converter drop into the input voltage that begins to start compensation and start the compensation threshold value;
Described CPU, the input voltage testing result that is used for inverse-excitation type DC-DC converter that described detecting unit is sent starts the compensation threshold value with the input voltage of predefined inverse-excitation type DC-DC converter and compares, and the input voltage the startup whether input voltage of judging inverse-excitation type DC-DC converter drops to predefined inverse-excitation type DC-DC converter compensates below the threshold value; If dropping to the input voltage of this inverse-excitation type DC-DC converter starts below the compensation threshold value, the operating state of then judging inverse-excitation type DC-DC converter is in continuous current mode of operation or interrupted current mode of operation, and controls the described first pwm signal output unit is exported pwm signal from corresponding duty ratio to described inverse-excitation type DC-DC converter according to judged result.
2. compensate control apparatus as claimed in claim 1 is characterized in that, described CPU comprises voltage falling judgment sub-unit, converter operating state judgment sub-unit and duty ratio computation subunit; Wherein:
Described voltage falling judgment sub-unit, the input voltage that is used for testing result that described detecting unit is sent and the DC-DC converter that is stored in described memory cell starts the compensation threshold value and compares, the input voltage that drops to this DC-DC converter at the input voltage of inverse-excitation type DC-DC converter starts the compensation threshold value when following, sends a converter operating state variable signal to described converter operating state judgment sub-unit;
Described converter operating state judgment sub-unit after receiving described converter operating state variable signal, is calculated respectively
Long-pending and
Long-pending, and result of calculation compared; If
Long-pending greater than
Long-pending, judge that then inverse-excitation type DC-DC converter is in the continuous current mode of operation, otherwise, judge that inverse-excitation type DC-DC converter is in the interrupted current mode of operation, and notify described duty ratio computation subunit judged result; Wherein, f is the operating frequency of described inverse-excitation type DC-DC converter, I
OutBe the output current of inverse-excitation type DC-DC converter, V
InBe the input voltage startup compensation threshold value of predefined inverse-excitation type DC-DC converter, V
OutStart the output voltage of compensation threshold value when following for inverse-excitation type DC-DC converter drops to input voltage at its input voltage, A is a correction voltage value, A=(23-10 * I
Out)/9, wherein, I
OutMore than or equal to 0.5A and smaller or equal to 1.4A, L
pLimit, source magnetizing inductance for inverse-excitation type DC-DC converter;
Described duty ratio computation subunit, if inverse-excitation type DC-DC converter is in the continuous current mode of operation, then controlling the first pwm signal output unit output duty cycle is the control end of the pwm signal of D1 to inverse-excitation type DC-DC converter; Wherein,
; V
InBe the input voltage startup compensation threshold value of predefined inverse-excitation type DC-DC converter, V
OutStart the output voltage of compensation threshold value when following for inverse-excitation type DC-DC converter drops to input voltage at its input voltage, n is the ratio of limit, the source number of turn with the secondary number of turn of inverse-excitation type DC-DC converter; Be in the interrupted current mode of operation if judge inverse-excitation type DC-DC converter, then controlling the first pwm signal output unit output duty cycle is the control end of the pwm signal of D2 to inverse-excitation type DC-DC converter; Wherein,
; V
InAfterDropBe the input voltage of inverse-excitation type DC-DC converter after its input voltage drops to below the predefined input voltage startup compensation threshold value, V
InBeforeDropBe the input voltage before inverse-excitation type DC-DC converter is below its input voltage drops to predefined input voltage startup compensation threshold value, D
BeforeDropBe the duty ratio of inverse-excitation type DC-DC converter before its input voltage drops to below the predefined input voltage startup compensation threshold value.
3. compensate control apparatus as claimed in claim 1 or 2 is characterized in that, described controller also comprises:
The second pwm signal output unit is under the control of described CPU, to described constant-current circuit output pwm signal;
The current switching signal output unit is under the control of described CPU, to described constant-current circuit output current start signal or failure of current signal, with the break-make of control LED lamp operating current.
4. compensate control apparatus as claimed in claim 3 is characterized in that, described constant-current circuit comprises filter circuit, comparator, power driving circuit, switching circuit, first current-limiting circuit, second current-limiting circuit and current sampling circuit;
The input of described filter circuit is electrically connected with the described second pwm signal output unit, and output is electrically connected with the first input end of described comparator; Second input of described comparator is electrically connected with the output of described first current-limiting circuit, the input of first current-limiting circuit is electrically connected with described current switching signal output unit, the output of this comparator is electrically connected with the input of described power driving circuit, and the output of described power driving circuit is electrically connected with the input of described switching circuit; First output of this switching circuit is electrically connected with the negative pole end of described LED lamp, second output of this switching circuit is electrically connected with the input of described second current-limiting circuit, the output of second current-limiting circuit is electrically connected with second input of described comparator, and second output of this switching circuit also is electrically connected with described current sampling circuit.
5. compensate control apparatus as claimed in claim 4 is characterized in that, described first current-limiting circuit, second current-limiting circuit and current sampling circuit are formed by a resistance.
6. compensate control apparatus as claimed in claim 5 is characterized in that described controller is made of single-chip microcomputer.
7. the compensating control method of a LED lamp when input voltage falls fast, described LED lamp comprises power supply input circuit and constant-current circuit; Described power supply input circuit comprises power module and the inverse-excitation type DC-DC converter that order is electrically connected; It is characterized in that described voltage compensation control method may further comprise the steps:
The input voltage that preestablishes inverse-excitation type DC-DC converter drops into the input voltage startup compensation threshold value that begins to start compensation;
Detect the input voltage and the output voltage of described inverse-excitation type DC-DC converter;
Controller compares the input voltage testing result and the predefined input voltage startup compensation threshold value of inverse-excitation type DC-DC converter, judges whether the input voltage of inverse-excitation type DC-DC converter drops to below the predefined input voltage startup compensation threshold value;
Dropped to below the predefined input voltage startup compensation threshold value if this controller is judged the input voltage of described inverse-excitation type DC-DC converter, then this controller judges that again the operating state of described inverse-excitation type DC-DC converter is in continuous current mode of operation or interrupted current mode of operation;
Controller is exported the pwm signal of corresponding duty ratio according to the current working mode of the inverse-excitation type DC-DC converter of judging to described inverse-excitation type DC-DC converter, makes the output voltage of inverse-excitation type DC-DC converter return to normal value.
8. the compensating control method of a kind of LED lamp as claimed in claim 7 when input voltage falls fast, it is characterized in that described controller judges that the operating state of inverse-excitation type DC-DC converter is in the continuous current mode of operation or the method for interrupted current mode of operation may further comprise the steps:
A. calculation procedure: controller calculates respectively
Long-pending and
Long-pending;
Wherein, f is the operating frequency of described inverse-excitation type DC-DC converter, I
OutBe the output current of inverse-excitation type DC-DC converter, V
InBe the input voltage startup compensation threshold value of predefined inverse-excitation type DC-DC converter, V
OutStart the output voltage of compensation threshold value when following for inverse-excitation type DC-DC converter reaches input voltage at its input voltage, A is a correction voltage value, A=(23-10 * I
Out)/9, wherein, I
OutMore than or equal to 0.5A and smaller or equal to 1.4A, L
pLimit, source magnetizing inductance for inverse-excitation type DC-DC converter;
B. compare determining step: will
Long-pending with
Long-pending comparing, if
Long-pending greater than
Long-pending, then controller judges that inverse-excitation type DC-DC converter is in the continuous current mode of operation; Otherwise controller judges that inverse-excitation type DC-DC converter is in the interrupted current mode of operation.
9. the compensating control method of a kind of LED lamp as claimed in claim 8 when input voltage falls fast is characterized in that,
Be in the continuous current mode of operation if judge inverse-excitation type DC-DC converter, then the controller output duty cycle is the control end of the pwm signal of D1 to inverse-excitation type DC-DC converter; Wherein,
; V
InBe the input voltage startup compensation threshold value of predefined inverse-excitation type DC-DC converter, V
OutStart the output voltage of compensation threshold value when following for inverse-excitation type DC-DC converter reaches input voltage at its input voltage, n is the ratio of limit, the source number of turn with the secondary number of turn of inverse-excitation type DC-DC converter;
Be in the interrupted current mode of operation if judge inverse-excitation type DC-DC converter, then the controller output duty cycle is the control end of the pwm signal of D2 to inverse-excitation type DC-DC converter; Wherein,
; V
InAfterDropBe the input voltage of inverse-excitation type DC-DC converter after its input voltage drops to below the predefined input voltage startup compensation threshold value, V
InBeforeDropBe the input voltage before inverse-excitation type DC-DC converter is below its input voltage drops to predefined input voltage startup compensation threshold value, D
BeforeDropBe the duty ratio of inverse-excitation type DC-DC converter before its input voltage drops to below the predefined input voltage startup compensation threshold value.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104512266A (en) * | 2013-09-29 | 2015-04-15 | 上海汽车集团股份有限公司 | Power supply management method in automobile starting process, and automobile power supply system |
| JP2015533468A (en) * | 2012-10-30 | 2015-11-24 | ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツングＲｏｂｅｒｔ Ｂｏｓｃｈ Ｇｍｂｈ | Method and apparatus for operating electronic rectifying motor |
| CN105207502A (en) * | 2014-06-12 | 2015-12-30 | 电力集成公司 | Line ripple compensation for shimmerless led driver |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101420811A (en) * | 2007-10-25 | 2009-04-29 | 科博达技术有限公司 | Vehicular HID lamp ballast for implementing soft switch PWM technique based on digital control |
| CN101499713A (en) * | 2008-01-31 | 2009-08-05 | 珠海全志科技有限公司 | Mixed switch power source converter and automatic switching control circuit |
| US20090295775A1 (en) * | 2008-06-03 | 2009-12-03 | Samsung Electro-Mechanics Co., Ltd. | Driving circuit of light emitting device |
| CN101710785A (en) * | 2008-08-30 | 2010-05-19 | 技领半导体(上海)有限公司 | Converter for adjusting output voltage and related method |
-
2011
- 2011-08-16 CN CN 201110233747 patent/CN102281686B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101420811A (en) * | 2007-10-25 | 2009-04-29 | 科博达技术有限公司 | Vehicular HID lamp ballast for implementing soft switch PWM technique based on digital control |
| CN101499713A (en) * | 2008-01-31 | 2009-08-05 | 珠海全志科技有限公司 | Mixed switch power source converter and automatic switching control circuit |
| US20090295775A1 (en) * | 2008-06-03 | 2009-12-03 | Samsung Electro-Mechanics Co., Ltd. | Driving circuit of light emitting device |
| CN101710785A (en) * | 2008-08-30 | 2010-05-19 | 技领半导体(上海)有限公司 | Converter for adjusting output voltage and related method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015533468A (en) * | 2012-10-30 | 2015-11-24 | ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツングＲｏｂｅｒｔ Ｂｏｓｃｈ Ｇｍｂｈ | Method and apparatus for operating electronic rectifying motor |
| CN104512266A (en) * | 2013-09-29 | 2015-04-15 | 上海汽车集团股份有限公司 | Power supply management method in automobile starting process, and automobile power supply system |
| CN104512266B (en) * | 2013-09-29 | 2017-02-15 | 上海汽车集团股份有限公司 | Power supply management method in automobile starting process, and automobile power supply system |
| CN105207502A (en) * | 2014-06-12 | 2015-12-30 | 电力集成公司 | Line ripple compensation for shimmerless led driver |
| CN105207502B (en) * | 2014-06-12 | 2019-01-29 | 电力集成公司 | Route ripple compensation for flicker free LED driver |
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| CN102281686B (en) | 2013-11-06 |
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