CN108513400A - The detection method of inductive current average detection system and its inductive current average detection system - Google Patents
The detection method of inductive current average detection system and its inductive current average detection system Download PDFInfo
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The present invention relates to a kind of inductive current average detection system and its detection methods of inductive current average detection system.The inductive current average detection system, including main control chip circuit, power switch tube, a plurality of concatenated light emitting diodes, inductance and peripheral circuit, the main control chip circuit is connect by peripheral circuit with the anode of a plurality of concatenated light emitting diodes, and the cathode of a plurality of concatenated light emitting diodes and one end of inductance connect, the other end of the inductance and the drain electrode of power switch tube connect, and the source plate and grid of the power switch tube are connect with main control chip circuit.
Description
Technical field
The present invention relates to the detections of a kind of inductive current average detection system and its inductive current average detection system
Method.
Background technology
Flourishing rising is also showed with a large amount of universal and application, the development of various LED drive chips of LED drive power
Trend.The development experience constant voltage drive pattern of LED drivings, linear constant current drive mode, Switching Power Supply constant current drive mode,
And almost linear constant current drive mode etc..And wherein most favored by market with Switching Power Supply constant current drive mode, with good
The characteristics such as the diversity and good reliability of good constant-current characteristics and various switch configurations.Low-end switch structur especially has
There are stability and good adjustability to be popularized and use by numerous designers and client.
Fig. 1 show traditional low-end switch circuit framework figure.The peak detection control system of traditional fixation turn-off time
System, since its circuit structure is simple, system loop stability is preferable, and convenient for design, therefore it is easier to client's reception.Its inductance
Peak point current can be fixed by peak current detection circuit, as shown in Figure 1, but since it is the fixed turn-off time, when defeated
When entering voltage change, in stable state, its output voltage is unconverted, according to voltage-second balance principle, then the peak of inductance
Value electric current is simultaneously unchanged, and then its output current is unchanged；It is unconverted in periphery but when output voltage changes,
The peak-to-peak value electric current of inductance then changes linearly therewith, therefore output current also changes therewith, therefore the control loop system
Load regulation it is relatively low；And when for different input voltages, since the output logic of its built-in comparator overturns delay, meeting
Cause peak value control not accurate, therefore the line regulation of the control loop system is not also high.It from the above description can be with
Find out, for the peak detection control system of traditional fixation turn-off time, load regulation and line regulation are opposite
It is relatively low, it can not effectively detect the average current on control inductance.
The chip of traditional technology controls inductance peak point current by peak point current electrical measurement, is stablized by the fixed turn-off time
Output current, control principle is simple, and stability is preferable, convenient for design, disadvantage is that：Chip is negative for fixed output
In the case of load, output current is a stationary value；But when system inputs or exports variation, then output current variation is apparent,
Its load regulation and line regulation it is not high cause chip apply in wide scope input and output be limited, client's need cannot be met
It asks.
Invention content
The object of the present invention is to provide a kind of traditional in LED constant current control system, and base is controlled by switching signal
Plinth introduces intermediate current detection circuit and average current assessment circuit, realizes that the detection to inductance intermediate current controls, to real
Accurately output current control is showed, there is preferable line regulation and load regulation, effectively increase the linear of system
Regulation and load regulation so that the work of the relatively reliable stabilization of New LED Constant Current Control System is applied to Switching Power Supply
Inductive current average detection system.It is a further object of the present invention to provide a kind of precisely flat to inductive current in Switching Power Supply
The detection control of intermediate current is assessed, realized to mean value, is had preferably to reach to provide output LED constant current control system
The detection method of line regulation and load regulation.
Technical solution of the invention is the inductive current average detection system, is applied in Switching Power Supply,
It is characterized in that, including main control chip circuit, power switch tube, a plurality of concatenated light emitting diodes, inductance and periphery electricity
Road, the main control chip circuit is connect by peripheral circuit with the anode of a plurality of concatenated light emitting diodes, and a plurality of strings
The cathode of the light emitting diode of connection and one end of inductance connect, and the other end of the inductance and the drain electrode of power switch tube connect,
The source plate and grid of the power switch tube are connect with main control chip circuit；After main control chip circuit start, control power is opened
Close pipe Q1Conducting, while voltage on CS pins is detected, inductive current is gradually increasing at this time, and electric current passes through sample resistance RCSForm CS
Pin voltage, into intermediate current comparison circuit control module, after CS voltages reach a certain reference voltage, chip can record
Turn-on time Ton at this time1, make power switch tube Q1It is further continued for conducting Ton1Time, total turn-on time Ton=2*Ton1；It
Afterwards, main control chip circuit switch-off power switching tube Q1, system enters freewheeling period, and inductance passes through fly-wheel diode and negative at this time
It is loaded into row afterflow, discharges energy on inductance, after it reaches the turn-off time set in chip, just controls power switch tube Q1Again
Conducting, enters next cycle；
After system is stablized, and when being operated in inductor current continuous mode, input and output voltage is in stable state at this time,
According to formula
Then inductive current at this time is in linear change；Simultaneously because
TON=2*TON1
It is accordingly used in judging to obtain Ton1The reference voltage of time then be inductive current after current sampling resistor Rcs
The median of power tube turn-on time section, due to inductive current linear change, value is average value among it, i.e.,
VREF=IL_AVG*RCS=IL_Ton1*RCS
IO=IL_AVG
And for the voltage-dropping type Constant Current Control System, average current value I on inductanceL_AVGAs output current value IO；It is main
It controls chip and passes through an accurately reference voltage VREFTo accurately control the current value of the middle time point, you can accurate steady
Surely output current is controlled.
As preferred：The main control chip circuit includes main control chip, intermediate current detection circuit, average current assessment electricity
Road and internal control circuit, and the main control chip is assessed by intermediate current detection circuit and average current assessment circuit in work(
Average current when rate switching tube is opened.
As preferred：The main control chip circuit further includes turn-off time initialization circuit, logic control circuit and driving control
Circuit processed, the logic control circuit are separately connected turn-off time initialization circuit, drive control circuit, intermediate current detection electricity
Road, average current assessment circuit.
As preferred：The peripheral circuit includes a plurality of resistance, a plurality of capacitances.
Another technical solution of the present invention is the inductive current average detection system, is applied to Switching Power Supply
In, it is characterized in that, including main control chip circuit, high-voltage circuit breaker pipe Q1With low-voltage power switch pipe Q2, alternating voltage
Input interface ACIN, a plurality of concatenated light emitting diodes, inductance and peripheral circuit, the main control chip circuit include master control core
Piece, Logic control module, intermediate current detection circuit, average current assessment circuit, PWM frequency control and EMI control circuits and
Internal control circuit, and the main control chip passes through a low-voltage power switch pipe Q2To drive a high-voltage circuit breaker pipe Q1,
By driving low-voltage power switch pipe Q2Make high-voltage circuit breaker pipe Q1It is switched on or off；Pwm pattern is used for fixed chip
Working frequency；The main control chip circuit is connect by peripheral circuit with the anode of a plurality of concatenated light emitting diodes, and
The cathode of a plurality of concatenated light emitting diodes and one end of inductance connect, the other end and the high-voltage circuit breaker pipe of the inductance
Q1Drain electrode connection, the high-voltage circuit breaker pipe Q1Grid meet supply voltage VDD, the high-voltage circuit breaker pipe Q1Source
Plate accesses the low-voltage power switch pipe Q2Drain electrode, the low-voltage power switch pipe Q2Grid driven through driving pulse DRV access
Dynamic control circuit, the low-voltage power switch pipe Q2Source electrode the intermediate electricity of main control chip circuit is respectively connected to through field-effect tube CS
Current detection circuit and average current assessment circuit；When system is in normal and steady operation, then average current value on inductance
IL_AVGAs output current value IO,
VREF=IO* Rcs=IL_AVG*RCS=IL_Ton1*RCS
Main control chip passes through an accurately reference voltage VREFAccurately control the current value of this middle time point,
It can accurate stable control output current.
As preferred：The main control chip circuit further includes the drive control circuit being connect respectively with logic control circuit,
Intermediate current detection circuit, average current assessment circuit and PWM frequency control and EMI control circuits.
As preferred：The peripheral circuit includes a plurality of resistance, a plurality of capacitances and alternating voltage input interface ACIN.
Another technical solution of the present invention is the inductive current average detection system applied to Switching Power Supply
Detection method, be characterized in that, include the following steps：
Step 1, main control chip start, and power switch tube is connected；
Step 2, main control chip detect voltage on source electrode that average current assessment circuit is connected with power switch tube, and electricity
Inducing current is gradually increasing；
Step 3, inductive current form the first pin voltage by sample resistance, and enter intermediate current detection circuit, when
After first pin voltage reaches the first reference voltage, 4 are thened follow the steps；When the first pin voltage is not up to the first reference voltage,
Then return to step 3；
Step 4, the turn-on time Ton of main control chip record at this time1, and power switch tube is made to be further continued for conducting Ton1When
Between；
Step 5, main control chip switch-off power switching tube, and system enters freewheeling period；
Step 6, inductance carry out afterflow by fly-wheel diode and load, energy on inductance are discharged, if inductance reaches master control
The turn-off time set in chip, then follow the steps 7；If inductance is not up to the turn-off time set in main control chip, execution is returned
Step 5；
Step 7, main control chip control power switch tube are connected, and return to step 1 again；
Step 8, detecting system are stablized, until control terminates.
As preferred：In the step 4, power switch tube obtains total turn-on time as 2* after being further continued for the conducting Ton1 times
Ton1。
As preferred：When detecting system is in normal and steady operation, then average current value on inductance, as output are electric
Flow valuve.
Compared with prior art, beneficial effects of the present invention:
(1) in LED constant current control system, have by introducing intermediate current comparison circuit and average current assessment circuit
Average current of the control chip of effect when power tube is opened, has reached the stability contorting to output current, has realized good
Line regulation and load regulation.
(2) the average detection method of inductive current of the invention, greatly improves traditional LED constant current control system
Line regulation and load regulation, effectively improve system stability, reliability and system compatibility.
(3) when system is in continuous operation mode, output current is the intermediate point current value of turn-on time section, is passed through
Average current assessment circuit is detected assessment to output current, and intermediate current comparison circuit realizes the comparison to intermediate current
It controls and logic exports, so as to preferably realize that the detection to inductive current average value controls, and then realize good line
Property regulation and load regulation
(4) the present invention realizes the inspection to inductive current by chip average current assessment circuit and intermediate current comparison circuit
Observing and controlling system, then intermediate current is inductance average current, passes through control as long as inductive current can be approximately linear current variation
Intermediate current can effectively control output current, reach stable output.
(5) in LED constant current control system, by the basis of traditional switching signal control, introducing average current assessment
Circuit and intermediate current detection circuit realize that the detection to inductance intermediate current controls, to realize accurately output current
Control has preferable line regulation and load regulation.
Description of the drawings
Fig. 1 is the peak detection control low-end switch circuit framework figure of traditional fixation turn-off time；
Fig. 2 is the circuit block diagram of the LED constant current control system of the present invention fixed turn-off time；
Fig. 3 is driving time signal of the present invention and inductor current signal oscillogram；
Fig. 4 is another specific embodiment AC/DC current constant control block diagrams of the present invention.
Specific implementation mode
The present invention is further detailed in conjunction with the accompanying drawings below：
Fig. 2, Fig. 3 show the first embodiment of the present invention.
It please refers to shown in Fig. 2, after chip starts, controls high-voltage circuit breaker pipe Q1Conducting, while detecting CS pins and powering on
Pressure, inductive current is gradually increasing at this time, and electric current passes through sample resistance RCSCS pin voltages are formed, it is more electric into intermediate current
Road control module, then after CS voltages reach a certain reference voltage, chip can record turn-on time Ton at this time1, and make
Power tube Q1It is further continued for conducting Ton1Time, therefore total turn-on time Ton=2*Ton1；Later, chip shutdown high-voltage power is opened
Close pipe Q1, system enters freewheeling period, and inductance carries out afterflow by fly-wheel diode and load at this time, discharges energy on inductance
Amount just controls high-voltage circuit breaker pipe Q after it reaches the turn-off time set in chip1It is connected, enters next again
Period.
Therefore when system is stablized after, and when being operated in inductor current continuous mode, input and output voltage is in stabilization at this time
State, according to formula
Then inductive current at this time is in linear change；Simultaneously because
TON=2*TON1
It is accordingly used in judging to obtain Ton1The reference voltage of time then be inductive current after current sampling resistor Rcs
The median of power tube turn-on time section, due to inductive current linear change, value is average value among it, i.e.,
VREF=IL_AVG*RCS=IL_Ton1*RCS
IO=IL_AVG
And for this voltage-dropping type Constant Current Control System, average current value I on inductanceL_AVGAs output current value
IO；Chip passes through an accurately reference voltage VREFTo accurately control the current value of this middle time point, you can accurate steady
Surely output current is controlled.
It please refers to shown in Fig. 3, driving time signal and inductor current signal oscillogram；Wherein TONFor system turn-on time,
IOFor system output current.When system inductance electric current is stable and in continuous mode, chip is in Ton1That is 1/2*Ton time points
The inductor current value tested is inductance average current value, and for decompression constant current buck control systems, inductance electricity
Stream can all flow through output, therefore output current average value is equal to inductance average current value, and chip is more electric by intermediate current
Road reaches required reference current value to control 1/2*Ton time point inductive currents, then when stablizing, output current just reaches
Stable reference current value is to be in pwm pattern or PFM control models without regard to chip.
In the present embodiment, the detection method of the inductive current average detection system includes the following steps：
Step 1, main control chip start, and power switch tube is connected；
Step 2, main control chip detect voltage on source electrode that average current assessment circuit is connected with power switch tube, and electricity
Inducing current is gradually increasing；
Step 3, inductive current form the first pin voltage by sample resistance, and enter intermediate current detection circuit, when
After first pin voltage reaches the first reference voltage, 4 are thened follow the steps；When the first pin voltage is not up to the first reference voltage,
Then return to step 3；
Step 4, the turn-on time Ton of main control chip record at this time1, and power switch tube is made to be further continued for conducting Ton1When
Between；The power switch tube is further continued for conducting Ton1It is 2*Ton that total turn-on time is obtained after time1；
Step 5, main control chip switch-off power switching tube, and system enters freewheeling period；
Step 6, inductance carry out afterflow by fly-wheel diode and load, energy on inductance are discharged, if inductance reaches master control
The turn-off time set in chip, then follow the steps 7；If inductance is not up to the turn-off time set in main control chip, execution is returned
Step 5；
Step 7, main control chip control power switch tube are connected, and return to step 1 again；
Step 8, detecting system are stablized, until control terminates.
In the present embodiment, when detecting system is in normal and steady operation, then average current value on inductance, as exports
Current value.
Fig. 4 shows the second embodiment of the present invention.
It please refers to shown in Fig. 4, the present embodiment is equally applicable for embodiment in AC/DC classes decompression Constant Current Control System, with Fig. 2
Unlike, the present embodiment uses source drive, i.e., drives a high-pressure MOS-Q by a low pressure MOS1, in this way
Son can be by driving low pressure MOS come so that high-pressure MOS is switched on or off；In addition, the present embodiment uses PWM to control
Molding formula, i.e. fixed chip working frequency.
Therefore no matter chip drive mode is different or the operating mode of chip is different, chip can pass through centre
Current comparison circuit and average current assessment circuit effectively control average current of the chip when power tube is opened, and work as and be
When system is in normal and steady operation, then average current value I on inductanceL_AVGAs output current value IO,
VREF=IO* Rcs=IL_AVG*RCS=IL_Ton1*RCS
Chip passes through an accurately reference voltage VREFTo accurately control the current value of this middle time point, you can
Accurate stable controls output current.
In the present embodiment, the detection method of the inductive current average detection system includes the following steps：
Step 1, main control chip start, and power switch tube is connected；
Step 2, main control chip detect voltage on source electrode that average current assessment circuit is connected with power switch tube, and electricity
Inducing current is gradually increasing；
Step 3, inductive current form the first pin voltage by sample resistance, and enter intermediate current detection circuit, when
After first pin voltage reaches the first reference voltage, 4 are thened follow the steps；When the first pin voltage is not up to the first reference voltage,
Then return to step 3；
Step 4, the turn-on time Ton of main control chip record at this time1, and power switch tube is made to be further continued for conducting Ton1When
Between；The power switch tube is further continued for conducting Ton1It is 2*Ton that total turn-on time is obtained after time1；
Step 5, main control chip switch-off power switching tube, and system enters freewheeling period；
Step 6, inductance carry out afterflow by fly-wheel diode and load, energy on inductance are discharged, if inductance reaches master control
The turn-off time set in chip, then follow the steps 7；If inductance is not up to the turn-off time set in main control chip, execution is returned
Step 5；
Step 7, main control chip control power switch tube are connected, and return to step 1 again；
Step 8, detecting system are stablized, until control terminates.
In the present embodiment, when detecting system is in normal and steady operation, then average current value on inductance, as exports
Current value.
It is by intermediate current comparison circuit and flat it is not difficult to find that the embodiment in embodiment and Fig. 4 in Fig. 2
Equal electric current assessment circuit effectively controls average current of the chip when power tube is opened, defeated using voltage-dropping type Buck control systems
Go out the characteristics of electric current is inductance average current, control output current efficiently and accurately, and there is good line regulation
And load regulation.Its relevant technical details is not quite similar, and details are not described herein again.
The foregoing is merely presently preferred embodiments of the present invention, all equivalent changes done according to scope of the invention as claimed with
Modification, should all belong to the covering scope of the claims in the present invention.
Claims (10)
1. a kind of inductive current average detection system is applied in Switching Power Supply, which is characterized in that including main control chip electricity
Road, power switch tube, a plurality of concatenated light emitting diodes, inductance and peripheral circuit, the main control chip circuit pass through periphery
The anode of circuit and a plurality of concatenated light emitting diodes is connect, and the cathode of a plurality of concatenated light emitting diodes and inductance
One end connects, and the other end of the inductance and the drain electrode of power switch tube connect, and the source plate and grid of the power switch tube are equal
It is connect with main control chip circuit；After main control chip circuit start, power switch tube Q is controlled1Conducting, while detecting CS pins and powering on
Pressure, inductive current is gradually increasing at this time, and electric current passes through sample resistance RCSCS pin voltages are formed, into intermediate current comparison circuit
Control module, after CS voltages reach a certain reference voltage, chip can record turn-on time Ton at this time1, make power switch tube
Q1It is further continued for conducting Ton1Time, total turn-on time Ton=2*Ton1；Later, main control chip circuit switch-off power switching tube Q1,
System enters freewheeling period, and inductance carries out afterflow by fly-wheel diode and load at this time, energy on inductance is discharged, when it is reached
After the turn-off time set in chip, power switch tube Q is just controlled1It is connected again, enters next cycle；
After system is stablized, and when being operated in inductor current continuous mode, input and output voltage is in stable state at this time, according to
Formula
Then inductive current at this time is in linear change；Simultaneously because
TON=2*TON1
It is accordingly used in judging to obtain Ton1The reference voltage of time then be inductive current after current sampling resistor Rcs in power
The median of pipe turn-on time section, due to inductive current linear change, value is average value among it, i.e.,
VREF=IL_AVG*RCS=IL_Ton1*RCS
IO=IL_AVG
And for the voltage-dropping type Constant Current Control System, average current value I on inductanceL_AVGAs output current value IO；Master control core
Piece passes through an accurately reference voltage VREFTo accurately control the current value of the middle time point, you can accurate stable control
Output current processed.
2. inductive current average detection system according to claim 1, which is characterized in that the main control chip circuit includes
Main control chip, intermediate current detection circuit, average current assessment circuit and internal control circuit, and during the main control chip passes through
Between current detection circuit and average current assessment circuit assess the average current when power switch tube is opened.
3. inductive current average detection system according to claim 2, which is characterized in that the main control chip circuit also wraps
Turn-off time initialization circuit, logic control circuit and drive control circuit are included, when the logic control circuit is separately connected shutdown
Between initialization circuit, drive control circuit, intermediate current detection circuit, average current assessment circuit.
4. inductive current average detection system according to claim 1, which is characterized in that the peripheral circuit includes plural number
A resistance, a plurality of capacitances.
5. a kind of inductive current average detection system is applied in AC/DC classes decompression constant-current control circuit, which is characterized in that
Including main control chip circuit, high-voltage circuit breaker pipe Q1With low-voltage power switch pipe Q2, alternating voltage input interface ACIN, plural number
A concatenated light emitting diode, inductance and peripheral circuit, the main control chip circuit include main control chip, Logic control module,
Intermediate current detection circuit, average current assessment circuit, PWM frequency control and EMI control circuits and internal control circuit, and institute
It states main control chip and passes through a low-voltage power switch pipe Q2To drive a high-voltage circuit breaker pipe Q1, by driving low pressure and low power
Switching tube Q2Make high-voltage circuit breaker pipe Q1It is switched on or off；Pwm pattern is used for the working frequency of fixed chip；It is described
Main control chip circuit is connect by peripheral circuit with the anode of a plurality of concatenated light emitting diodes, and a plurality of concatenated luminous
The cathode of diode and one end of inductance connect, the other end and the high-voltage circuit breaker pipe Q of the inductance1Drain electrode connection, institute
State high-voltage circuit breaker pipe Q1Grid meet supply voltage VDD, the high-voltage circuit breaker pipe Q1Source plate access the low pressure work(
Rate switching tube Q2Drain electrode, the low-voltage power switch pipe Q2Grid access drive control circuit through driving pulse DRV, it is described
Low-voltage power switch pipe Q2Source electrode the intermediate current detection circuit peace of main control chip circuit is respectively connected to through field-effect tube CS
Equal electric current assessment circuit；When system is in normal and steady operation, then average current value I on inductanceL_AVGAs output current
Value IO,
VREF=IO* Rcs=IL_AVG*RCS=IL_Ton1*RCS
Main control chip passes through an accurately reference voltage VREFTo accurately control the current value of this middle time point, you can
Accurate stable controls output current.
6. inductive current average detection system according to claim 5, which is characterized in that the main control chip circuit also wraps
Include the drive control circuit being connect respectively with logic control circuit, intermediate current detection circuit, average current assessment circuit and PWM
FREQUENCY CONTROL and EMI control circuits.
7. inductive current average detection system according to claim 5, which is characterized in that the peripheral circuit includes plural number
A resistance, a plurality of capacitances and alternating voltage input interface ACIN.
8. a kind of detection method of inductive current average detection system, which is characterized in that include the following steps：
Step 1, main control chip start, and power switch tube is connected；
Step 2, main control chip detect voltage on source electrode that average current assessment circuit is connected with power switch tube, and inductance electricity
Stream is gradually increasing；
Step 3, inductive current form the first pin voltage by sample resistance, and enter intermediate current detection circuit, when first
After pin voltage reaches the first reference voltage, 4 are thened follow the steps；When the first pin voltage is not up to the first reference voltage, then return
Receipt row step 3；
Step 4, the turn-on time Ton of main control chip record at this time1, and power switch tube is made to be further continued for conducting Ton1Time；
Step 5, main control chip switch-off power switching tube, and system enters freewheeling period；
Step 6, inductance carry out afterflow by fly-wheel diode and load, energy on inductance are discharged, if inductance reaches main control chip
The turn-off time inside set, then follow the steps 7；If inductance is not up to the turn-off time set in main control chip, return to step
5；
Step 7, main control chip control power switch tube are connected, and return to step 1 again；
Step 8, detecting system are stablized, until control terminates.
9. the control method of inductive current average detection system according to claim 8, which is characterized in that the step 4
In, power switch tube is further continued for conducting Ton1It is 2*Ton that total turn-on time is obtained after time1。
10. the control method of inductive current average detection system according to claim 8, which is characterized in that work as detection system
When system is in normal and steady operation, then average current value on inductance, as output current value.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109327938A (en) * | 2018-11-21 | 2019-02-12 | 电子科技大学 | A kind of the inductive current valley detection method and constant current control method of LED drive circuit |
| CN109496012A (en) * | 2018-11-20 | 2019-03-19 | 电子科技大学 | A kind of variable turn-off time control circuit for LED constant current driving device |
| CN112782633A (en) * | 2020-12-24 | 2021-05-11 | 深圳市优优绿能电气有限公司 | Inductive current sampling calibration method, system and computer readable storage medium |
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| CN108513400B (en) | 2019-11-19 |
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