CN104768292A - Drive circuit applied to intelligent cell system - Google Patents
Drive circuit applied to intelligent cell system Download PDFInfo
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- CN104768292A CN104768292A CN201510138979.3A CN201510138979A CN104768292A CN 104768292 A CN104768292 A CN 104768292A CN 201510138979 A CN201510138979 A CN 201510138979A CN 104768292 A CN104768292 A CN 104768292A
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- drive circuit
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- error amplifier
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The invention provides a drive circuit applied to an intelligent cell system. The drive circuit comprises a feedback loop and a power tube and further comprises a starting detection resistor connected with a load LED in series, a starting detection amplifier for detecting pressure drop on the starting detection resistor and an electrifying detection circuit for detecting electrifying on the circuit. The output end of the starting detection amplifier and the output end of the electrifying detection circuit are connected with the input end and the reset end of a trigger. The starting detection resistor is connected between the output voltage end and the load LED. The output end of an either-or gating switch is connected with the input end of a PWM comparator. By the adoption of the drive circuit applied to the intelligent cell system, the switching state of the power tube is controlled by detecting the output voltage, the drive circuit operates continuously at a large duty ratio in the starting stage till the breakover condition of the load LED is met, the rising speed of the output voltage is increased, and the starting time is shortened.
Description
Technical field
The invention belongs to integrated circuit (IC) design field, relate to Switching Power Supply, particularly a kind of drive circuit applying to community intelligent system.
Background technology
The one of semiconductor diode, can become luminous energy electric energy conversion.Light-emitting diode is the same with general-purpose diode to be made up of a PN junction, also has unilateral conduction.After adding forward voltage to light-emitting diode, be injected into the hole in N district from P district and be injected into the electronics in P district by N district.
LED can only toward a direction conducting (energising), be called forward bias (forward bias), when the current flows, electronics and hole compound and send monochromatic light within it, this is electroluminescent effect, compare with neon lamp with incandescent lamp bulb, the feature of light-emitting diode is: operating voltage very low (more several volts had); Operating current very little (the only zero point several milliamperes had can be luminous); Shock resistance and anti-seismic performance good, reliability is high, and the life-span is long; Can the power of modulated luminescence easily by modulating that the electric current that passes through is strong and weak.Owing to there being these features, utilizing and emitting ledly carry out illumination and be applied in more and more widely among scope.
In existing single-stage high-power rate factor LED illumination drive scheme, bulky capacitor in parallel (usual hundreds of microfarad) is needed to reduce the ripple of LED at LED output.This electric capacity initial voltage is 0V, needs the operating voltage tens volts of stable states charging to LED.If the soft start not adding chip internal controls, then easily there is output voltage overshoot when startup and cause LED to have startup Transient Currents.And chip internal increases soft start control, then can increase start-up time entirely bright from switch opens to LED, be difficult to needs start-up time meeting <0.5S.
Summary of the invention
For improving the toggle speed of LED drive circuit, the invention discloses a kind of drive circuit applying to community intelligent system.
The drive circuit applying to community intelligent system of the present invention, comprise and exchange input stage, feedback control loop and power tube, described feedback control loop comprises error amplifier, PWM comparator, logic drive circuit, the output of described logic drive circuit is connected with the control end of power tube, and described error amplifier is for detecting the output voltage of LED drive circuit;
Also comprise the start detection resistance joined with load LED strip, and to the start detection amplifier that the ohmically pressure drop of start detection detects, and for the power on detection circuit that testing circuit powers on, the output of described start detection amplifier and power on detection circuit is connected with the input of trigger and reset terminal respectively; Described start detection resistance is connected between output voltage terminal and load LED;
The output of described error amplifier connects the first input end connection of alternative gating switch, and the second input of described alternative gating switch is connected with high position reference voltage; The described control end of alternative gating switch is connected with the output of trigger, and the output of described alternative gating switch is connected with the input of PWM comparator;
The reference voltage value of described high position reference voltage is not less than the supply voltage of error amplifier.
Concrete, described interchange input stage is full bridge rectifier.
Preferably, also comprise LDO and Serial regulation reference voltage, also be in series with Correctional tube between described start detection resistance and load LED, the control end of Correctional tube is connected with the output of LDO, and two inputs of described LDO are connected with load LED and Serial regulation reference voltage respectively.
Preferably, also building-out capacitor is connected with between described error amplifier and ground.
Concrete, described trigger is rest-set flip-flop.
Concrete, described power on detection circuit is the start-up capacitance being connected to flipflop input terminal, and described start-up capacitance is connected between power input and ground.
Adopt the drive circuit applying to community intelligent system of the present invention, by detecting the on off state of output voltage control power tube, startup stage with big space rate continuous service until meet the turn-on condition of load LED, improve the rate of climb of output voltage, shorten start-up time.
Accompanying drawing explanation
Fig. 1 illustrates a kind of embodiment structural representation of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
The drive circuit applying to community intelligent system of the present invention, comprise and exchange input stage, feedback control loop and power tube, described feedback control loop comprises error amplifier, PWM comparator, logic drive circuit, the output of described logic drive circuit is connected with the control end of power tube, and described error amplifier is for detecting the output voltage of LED drive circuit; Also comprise the start detection resistance joined with load LED strip, and to the start detection amplifier that the ohmically pressure drop of start detection detects, and for the power on detection circuit that testing circuit powers on, the output of described start detection amplifier and power on detection circuit is connected with the input of trigger and reset terminal respectively; Described start detection resistance is connected between output voltage terminal and load LED.
The output of described error amplifier connects the first input end connection of alternative gating switch, and the second input of described alternative gating switch is connected with high position reference voltage; The described control end of alternative gating switch is connected with the output of trigger, and the output of described alternative gating switch is connected with the input of PWM comparator;
The reference voltage value of described high position reference voltage is not less than the supply voltage of error amplifier.
Embodiment as shown in Figure 1, power on detection circuit is the start-up capacitance being connected to flipflop input terminal, described start-up capacitance is connected between power input and ground, start-up capacitance charging when powering on, voltage rises gradually, and in uphill process, trigger exports high level signal, and trigger can select the simplest rest-set flip-flop formed with door by two, flipflop output signal, to single-pole double-throw switch (SPDT), controls single-pole double-throw switch (SPDT) and is connected between PWM input and high position reference voltage.
Startup stage, as shown in Figure 1, two inputs of PWM comparator are connected between high position reference voltage and triangular-wave generator, high position reference voltage is higher than the supply voltage of error amplifier, PWM is made to compare the output voltage maximum being necessarily greater than error amplifier by comparative voltage of input, PWM comparator runs with maximum duty cycle, and the maximum duty cycle exporting square wave is determined by triangular-wave generator.After logic drive circuit, the square wave driving power pipe MN1 of this maximum duty cycle runs with maximum duty cycle, and output voltage rises fast.
Startup stage, because output voltage is not enough, the load LED of cascade cannot conducting, start detection resistance RCS does not have electric current to flow through, two ends pressure reduction is zero, when output voltage VO UT rises to certain value, such as each load LED conducting needs 3V voltage, then 10 LED strip connection need 30V to get final product conducting, now load LED conducting, generation current on RCS, RCS two ends produce pressure drop, start detection amplifier output level reverses, flipflop output signal is reset, control alternative gating switch error amplifier output is connected with PWM comparator input terminal, thus realize normal FEEDBACK CONTROL, startup stage big space rate promote output voltage VO UT process and terminate.
As shown in Figure 1, the positive input of load LED and output voltage feedback end feed back input to be compared with the first reference voltage V REF1 to error amplifier produce output voltage error amplifier COMP; What adopt in present case is a kind of error amplifier of crest constant voltage, and namely the function of this error amplifier is that the crest of constant load LED strip positive input is stabilized near a steady state value.The triangle wave voltage that COMP voltage and alternating current sampling circuit export compares the ON time TON producing power tube MN1.COMP is higher, and the TON time is longer, and the energy being transferred to output capacitance COUT is more, and the time of power tube MN1 conducting only VBUS and COUT voltage close to time conducting.Whole system forms closed-loop control, exports the real-time control of institute's energy requirement realization to the ON time of COUT transmitting energy according to LED.
Preferably, also comprise LDO and Serial regulation reference voltage, also be in series with Correctional tube MN2 between described start detection resistance and load LED, the control end of Correctional tube is connected with the output of LDO, and two inputs of described LDO are connected with load LED and Serial regulation reference voltage V REF3 respectively.
Adopt the control mode of above-mentioned LDO and Correctional tube, no matter input or output voltage how to change, make that the voltage on load LED strip positive input is constant all the time equals Serial regulation reference voltage, eliminate the fluctuation of pressure drop because output voltage fluctuates on the load LED caused, make LED output current more stable, make the output voltage feedback end voltage constant being input to Inner Control Loop simultaneously, reduce the power loss of control loop.
AC conversion is the direct current periodic sinusoidal waveform of half waveshape by the full bridge rectifier that interchange input stage can adopt four diodes to form.Switching Power Supply topology in Fig. 1 can be the various Switching Power Supply structures comprising power tube, such as BUCK, BUCK-BOOST etc.
Preferably, between the output of described error amplifier and ground, be connected with building-out capacitor C2, a dominant pole can be provided for control loop, the stability that reinforcing feedback controls.
Adopt the drive circuit applying to community intelligent system of the present invention, by detecting the on off state of output voltage control power tube, startup stage with big space rate continuous service until meet the turn-on condition of load LED, improve the rate of climb of output voltage, shorten start-up time.
Previously described is each preferred embodiment of the present invention, preferred implementation in each preferred embodiment is if not obviously contradictory or premised on a certain preferred implementation, each preferred implementation can stack combinations use arbitrarily, design parameter in described embodiment and embodiment is only the invention proof procedure in order to clear statement inventor, and be not used to limit scope of patent protection of the present invention, scope of patent protection of the present invention is still as the criterion with its claims, the equivalent structure change that every utilization specification of the present invention and accompanying drawing content are done, in like manner all should be included in protection scope of the present invention.
Claims (6)
1. apply to the drive circuit of community intelligent system, comprise and exchange input stage, feedback control loop and power tube, described feedback control loop comprises error amplifier, PWM comparator, logic drive circuit, the output of described logic drive circuit is connected with the control end of power tube, and described error amplifier is for detecting the output voltage of LED drive circuit;
It is characterized in that, also comprise the start detection resistance joined with load LED strip, and to the start detection amplifier that the ohmically pressure drop of start detection detects, and for the power on detection circuit that testing circuit powers on, the output of described start detection amplifier and power on detection circuit is connected with the input of trigger and reset terminal respectively; Described start detection resistance is connected between output voltage terminal and load LED;
The output of described error amplifier connects the first input end connection of alternative gating switch, and the second input of described alternative gating switch is connected with high position reference voltage; The described control end of alternative gating switch is connected with the output of trigger, and the output of described alternative gating switch is connected with the input of PWM comparator;
The reference voltage value of described high position reference voltage is not less than the supply voltage of error amplifier.
2. apply to the drive circuit of community intelligent system as claimed in claim 1, it is characterized in that, described interchange input stage is full bridge rectifier.
3. apply to the drive circuit of community intelligent system as claimed in claim 1, it is characterized in that, also comprise LDO and Serial regulation reference voltage, also Correctional tube is in series with between described start detection resistance and load LED, the control end of Correctional tube is connected with the output of LDO, and two inputs of described LDO are connected with load LED and Serial regulation reference voltage respectively.
4. apply to the drive circuit of community intelligent system as claimed in claim 1, it is characterized in that, between described error amplifier and ground, be also connected with building-out capacitor.
5. apply to the drive circuit of community intelligent system as claimed in claim 1, it is characterized in that, described trigger is rest-set flip-flop.
6. apply to the drive circuit of community intelligent system as claimed in claim 1, it is characterized in that, described power on detection circuit is the start-up capacitance being connected to flipflop input terminal, and described start-up capacitance is connected between power input and ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510138979.3A CN104768292A (en) | 2015-03-27 | 2015-03-27 | Drive circuit applied to intelligent cell system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510138979.3A CN104768292A (en) | 2015-03-27 | 2015-03-27 | Drive circuit applied to intelligent cell system |
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| CN104768292A true CN104768292A (en) | 2015-07-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510138979.3A Pending CN104768292A (en) | 2015-03-27 | 2015-03-27 | Drive circuit applied to intelligent cell system |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203368874U (en) * | 2013-08-20 | 2013-12-25 | 翁巧慧 | LED lighting energy-saving circuit |
| CN103715884A (en) * | 2014-01-09 | 2014-04-09 | 中国人民解放军海军工程大学 | Constant-current constant-voltage converter based on PWM |
| CN104470099A (en) * | 2014-11-26 | 2015-03-25 | 成都岷创科技有限公司 | Light emitting diode driving circuit |
| CN204559948U (en) * | 2015-03-27 | 2015-08-12 | 绵阳豪迈电子科技有限公司 | Apply to the LED alternating-current drive circuit of community intelligent system |
-
2015
- 2015-03-27 CN CN201510138979.3A patent/CN104768292A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203368874U (en) * | 2013-08-20 | 2013-12-25 | 翁巧慧 | LED lighting energy-saving circuit |
| CN103715884A (en) * | 2014-01-09 | 2014-04-09 | 中国人民解放军海军工程大学 | Constant-current constant-voltage converter based on PWM |
| CN104470099A (en) * | 2014-11-26 | 2015-03-25 | 成都岷创科技有限公司 | Light emitting diode driving circuit |
| CN204559948U (en) * | 2015-03-27 | 2015-08-12 | 绵阳豪迈电子科技有限公司 | Apply to the LED alternating-current drive circuit of community intelligent system |
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Application publication date: 20150708 |