CN105934043B - A kind of lamp control system - Google Patents
A kind of lamp control system Download PDFInfo
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- CN105934043B CN105934043B CN201610487197.5A CN201610487197A CN105934043B CN 105934043 B CN105934043 B CN 105934043B CN 201610487197 A CN201610487197 A CN 201610487197A CN 105934043 B CN105934043 B CN 105934043B
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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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Abstract
The invention provides a kind of lamp control system, including：The exchange input filter unit of processing is filtered to city's electric signal；The rectification that the AC signal of the exchange input filter unit output is converted into direct current signal exports filter unit；Receive the direct current signal of rectification output filter unit output, and carry out the Active PFC boosting unit of boost action, assists winding one end that PFC chips U1 and supply transformer PFC T1, the supply transformer PFC T1 are provided with the Active PFC boosting unit is connected to the power port of PFC chips by commutation diode D32, the first steady module of string；Meanwhile, the AC fault detection units being made up of photoelectrical coupler U800 and switching tube Q801 are provided between the exchange input filter unit and rectification output filter unit.Lamp control system proposed by the present invention mainly improves AC fault detection units so that circuit is simplified, low in energy consumption, detects error free, works well.
Description
Technical field
The present invention relates to light fixture control technology field, and in particular to a kind of light fixture control being controlled to single led street lamp
System processed.
Background technology
Street lamp, shows the light fixture that road provides illumination functions, refers to the light fixture in the illumination zone of road surface in traffic lighting.Its
In because LED street lamp is compared with other street lamps, the features such as with environment friendly and pollution-free, little power consumption, light efficiency high, long lifespan, therefore LED
Street lamp becomes the optimal selection of reducing energy consumption.With continue to develop and the progress of science and technology, electronics industry, for LED roads
The control system of lamp becomes complicated all the more, and function also becomes diversification all the more.But it is howsoever complicated, for LED street lamp,
Its constant-current driving power supply special procured, is the big foundation stone for ensureing its normal work, and the scheme of simple switch power supply can often be brought
The damage of LED component.Unstable present situation is supplied for China's supply voltage, roads light LED drive circuit has constant current
Output characteristics is very necessary, it is ensured that light output is constant and prevents LED overpower from running.
In LED street lamp control system, generally using civil power as power supply, then by Active PFC unit
Higher voltage signal is obtained after (i.e. PFC) boosting, turns into then through LLC resonant converter circuit conversion and meets street lamp drive
Dynamic desired low-voltage DC.But in these lamp control systems, however it remains some design defect：
One, AC fault detection units are typically designed with for AC AC signal input sides, for detection civil power input
Whether whether normal and PFC boost circuit is able to normal work.But existing unit design complexity, and detection mistake
Poor big, Detection results are general, and not ideal enough.
Secondly, be typically designed with DC fault detection units for DC DC signal outputs side, for detection low-voltage direct
Whether signal is normally exporting.But DC fault detection unit peripheral components designed in most of system are more, voltage inspection
Survey not accurate enough, power dissipation ratio is larger, and is constituted more with triode, and triode belongs to current drive-type element, and it is to base stage
Driving current is required, and this causes the power consumption above divider resistance to increase, and is unfavorable for DC fault detects.
Thirdly, for PFC boost part, its be for the direct current (DC) to the feed-in circuit or exchange (AC) electricity
Pressure is boosted, while power factor can also be arranged as being formed close to 1 consumer (PFC).The circuit leads to
Often there are two kinds of forms：1. the passive PFC constituted using discrete components such as inductance；2. entered based on power factor controller chip
The active PFC of row design.In the active PFC boost circuit being designed based on chip, the supply port of chip is led to
Often directly rectified diode is connected with the supply transformer assists winding in PFC boost circuit, once and feel in assists winding
When the voltage signal answered unstable situation occurs or even fluctuates larger, chip operation is subject to influence, and then causes PFC boost
Circuit is not normally functioning.It is further that the external switch pipe break-make driving of PFC boost circuit is slow so as to input
Electric current is when entering horizontal phasing control in the presence of certain influence.
Four, for LLC resonant converter part, it is for improving power supply conversion efficiency.The partial circuit
There are a variety of structures in Power Management Design field.Have and half-bridge driven is carried out using discrete component, also have and carried out using control chip
Half-bridge driven.In the resonance oscillation semi-bridge control circuit being made up of LLC resonance control chips, the power supply of chip is typically directly rectified
Diode is connected to the supply transformer assists winding in PFC boost circuit, once and sense in the assists winding voltage letter
When number unstable situation occur and even fluctuating larger, chip operation is subject to influence, and then causes resonance oscillation semi-bridge is in unstable
Determine working condition.It is further, for two power tubes of resonance oscillation semi-bridge, corresponding port of its grid directly with chip
It is connected, this causes the break-make speed of power tube drives to be under some influence, and there is also the exception simultaneously turned on, have impact on
The conversion efficiency of power supply.
It is five, secondary in the resonance transformer of LLC resonant converter circuit, it generally can all access output filter rectification list
Member, LED street lamp is conveyed to after the secondary induction voltage of resonance transformer is carried out into rectification.In order to stablize the letter of the direct current after rectification
Number and in order to adjust the voltage/current size of output, be designed with output voltage/electric current in many lamp control systems
Adjustment unit.Once output current deviate from predeterminated voltage/current value, the adjustment unit will cause LLC resonance by feedback
Converter circuit is adjusted to realize constant current constant voltage.Operation amplifier being used present output voltage/electric current adjustment unit more
Device and some discrete components are constituted, though better regulating effect can be obtained, due to often there is voltage in terms of power supply
Unstable situation, causes amplifier work susceptible therein, and then make it that regulation result is not accurate enough；And circuit is in itself
Design is numerous and diverse, is also easily caused the problem of regulation is inaccurate, regulation is unstable.
The content of the invention
It is an object of the present invention to provide a kind of lamp control system, it like clockwork can examine AC primes failure
Measure and, the AC primes malfunction, which includes lamp control system, does not have ac input signal or the abnormal work of PFC boost circuit
The state of work, solves the deficiency that AC failure detector circuits are present in the prior art.
To achieve the above object, present invention employs following technical scheme：
A kind of lamp control system, including：
The exchange input filter unit of processing is filtered to city's electric signal；
The rectification that the AC signal of the exchange input filter unit output is converted into direct current signal exports filter unit；
The direct current signal of rectification output filter unit output is received, and it is single to carry out the Active PFC boosting of boost action
PFC chips U1 and supply transformer PFC T1 are provided with member, the Active PFC boosting unit, wherein
Assists winding one end of the supply transformer PFC T1 is connected by commutation diode D32, the first steady module of string
To the power port of PFC chips；Meanwhile, it is provided between the exchange input filter unit and rectification output filter unit
AC fault detection units；The AC fault detection units include：
Photoelectrical coupler U800 and switching tube Q801；Wherein,
The light-emitting diodes tube anode of the photoelectrical coupler U800 is connected to the signal of the steady module of the first string through resistance R801
Input, negative electrode is connected to switching tube Q801 drain electrode；The phototriode base stage of the photoelectrical coupler U800 receives luminous
The light that diode is sent, colelctor electrode outwards draws composition AC fault detects end, grounded emitter；The source of the switching tube Q801
Pole is grounded, and grid is connected to rectification and voltage division unit through resistance R809, and is connected to exchange input filter by rectification and voltage division unit
Between unit and rectification output filter unit.
Compared to prior art, above-mentioned lamp control system of the invention has the advantages that：
The above-mentioned lamp control system of the present invention is realized by photoelectrical coupler U800 and switching tube Q801 mutual cooperation
AC prime fault detects to lamp control system, the circuit design is simple, low in energy consumption, and is made by designing rectification and voltage division unit
It only must just can determine that exchange input is without exception when exchange input is higher than 85V or so, it is to avoid the misoperation that low pressure is produced, realize
Detection is error free, and Detection results are good.And the resistance R809 designed can play a part of protection switch pipe Q801.
Further advantage, target and the feature of the present invention embodies part by following explanation, and part will also be by this
The research and practice of invention and be understood by the person skilled in the art.
Brief description of the drawings
Fig. 1 is the theory diagram of lamp control system of the present invention；
Fig. 2 is the Active PFC boosting unit schematic diagram of lamp control system of the present invention；
Fig. 3 is the AC fault detection unit schematic diagrams of lamp control system of the present invention；
Fig. 4 is the LLC resonant converter control unit schematic diagram of lamp control system of the present invention；
Fig. 5 is the output rectification filter unit schematic diagram of lamp control system of the present invention；
Fig. 6 is the DC fault detection unit schematic diagrams of lamp control system of the present invention；
Fig. 7 generates for the supply voltage VCC3 of the output voltage/electric current adjustment unit of lamp control system of the present invention
Figure；
Fig. 8 is the output voltage/electric current adjustment unit schematic diagram of lamp control system of the present invention；
Fig. 9 is the output over-voltage protection unit schematic diagram of lamp control system of the present invention；
Figure 10 is the three-in-one light adjusting circuit figure of lamp control system of the present invention.
Embodiment
In order that technological means, creation characteristic, reached purpose that the present invention is realized more understand and are apparent to effect,
The present invention is further elaborated with reference to the accompanying drawings and detailed description：
Referring to Fig. 1 and with reference to Fig. 2-3, the present invention proposes a kind of lamp control system, including：City's electric signal is filtered
The exchange input filter unit of ripple processing；The AC signal of the exchange input filter unit output is converted into direct current signal
Rectification exports filter unit；The direct current signal of rectification output filter unit output is received, and carries out the power factor (PF) of boost action
Be provided with correcting step-up unit (hereinafter referred to as PFC boost unit), the Active PFC boosting unit PFC chips U1 and
Supply transformer PFC T1.Wherein, as the improvement project of the present invention：
Assists winding one end of the supply transformer PFC T1 is connected by commutation diode D32, the first steady module of string
To the power port of PFC chips；Meanwhile, it is provided with AC between the exchange input filter unit and rectification output filter unit
Fault detection unit；The AC fault detection units include：Photoelectrical coupler U800 and switching tube Q801；Wherein, the photoelectricity
Coupler U800 light-emitting diodes tube anode (1 pin) is connected to signal input part (i.e. Fig. 2 of the steady module of the first string through resistance R801
In VCC801), negative electrode (2 pin) is connected to switching tube Q801 drain electrode；The phototriode base of the photoelectrical coupler U800
Pole receives the light that light emitting diode is sent, and colelctor electrode (4 pin) is outwards drawn and constitutes AC fault detects end, and emitter stage (3 pin) connects
Ground；The source ground of the switching tube Q801, grid is connected to rectification and voltage division unit through resistance R809, and passes through rectification and voltage division list
Member is connected between exchange input filter unit and rectification output filter unit.Resistance R809 preferentially chooses resistance for 10K Europe.
In such scheme, as seen from Figure 3, switching tube Q801 preferentially uses metal-oxide-semiconductor.In specific detection, AC failures
Detected that now photoelectrical coupler U800 4 pin access a survey by external pull-up resistor by external microcontroller in test side
Try voltage.When the AC of lamp control system has, the alternating current higher than 85V inputs (having voltage on R809) and PFC being capable of normal work
When, VCC801 voltages are normal, switching tube Q801 conductings, the conducting of photoelectrical coupler 1-2 pin, and now 4 pin of photoelectrical coupler are low
Voltage, i.e. AC fault detects end AC-OK level signal are low level, therefore single-chip microcomputer will pass through the low level and quickly judge lamp
Tool control system has AC signal input, and PFC boost circuit is working properly.If the AC of lamp control system is inputted without exchange
Or the work of PFC boost circuit abnormal, switching tube Q801 grids no-voltage or VCC801 no-voltages, the 4 of photoelectrical coupler
Pin voltage is that high voltage, i.e. AC fault detects end AC-OK level signal are high level, is consistent with pull-up test voltage,
Therefore single-chip microcomputer will pass through the high level and judge that current lamp control system has AC prime failures.
As shown in figure 3, the rectification and voltage division unit includes：Commutation diode D14 and commutation diode D15, the sun of the two
Pole is respectively connecting to exchange two signal wires between input filter unit and rectification output filter unit, and the negative electrode of the two passes through
Electric capacity C64, electric capacity the C65 ground connection of series connection；Point constituted is sequentially connected in series by resistance R25, resistance R26, resistance R27 and resistance R28
Unit is pressed, the resistance R25 other end accesses commutation diode D14 and commutation diode D15 negative electrode, the resistance R28 other end
Access ground；Wherein, one end access switching tube Q801 of resistance R809 grid, the other end is connected to by voltage-stabiliser tube ZD20
Concatenation point between resistance R27 and resistance R28, the anode of the voltage-stabiliser tube ZD20 also accesses ground by resistance R29.
Here, when exchanging extraction AC fault detection units between input filter unit and rectification output filter unit, also
By designing rectification and voltage division unit, switching tube Q801 is effectively ensured in exchange 85V or so just meeting normally work with this, it is to avoid
The misoperation that low pressure is produced.It is further that a voltage-stabiliser tube is also parallel between switching tube Q801 drain electrode and source electrode, should
Voltage-stabiliser tube is that Q801 grids are protected first, and next is also functioned to when AC voltages are more than 85V, the work that Q801 can just be turned on
With, it is to avoid the erroneous judgement that low-voltage is produced.In rectification and voltage division unit, resistance R25, resistance R26 and resistance R27 preferentially choose electricity
Resistance is in 402K, and resistance R28 preferentially chooses resistance value in 510K.Resistance R29 preferentially chooses resistance value in 82K.Voltage-stabiliser tube ZD20
Choose voltage-stabiliser tube of the burning voltage in 18V.
Specifically, the AC signal that exchange input filter unit is exported is after D14, D15 rectification in resistance R25, electricity
Partial pressure is carried out on resistance R26, resistance R27 and resistance R28, now R809 power taking pressures from voltage-stabiliser tube ZD20 and resistance R29 are sent to
The grid of switching tube.When the AC of lamp control system has higher than the input of 85V alternating currents, i.e., when normal work input AC is electric, electricity
There is voltage on resistance R809, then just possess the turn-on condition for promoting switching tube to turn between the grid and source electrode of switching tube.If
Now the PFC boost unit in lamp control system also can have voltage signal at normal work, i.e. VCC801, then photoelectricity coupling
Clutch U800 light emitting diode just has electric current to pass through, and now 4 pin (AC fault detects end) output low level, external microcontroller is sentenced
Determine the AC prime fault-frees of lamp control system.If the PFC boost unit now in lamp control system fails normal work,
That is no-voltage signal at VCC801, then the light emitting diode of photoelectrical coupler does not have electric current to pass through, now 4 pin (examine by AC failures
Survey end) high level is exported, external microcontroller judges that the AC primes of lamp control system are faulty.Either without electricity on resistance R809
Pressure or VCC801 no-voltages, external microcontroller can judge that lamp control system has AC primes according to the high level detected
Failure.
Wherein, switching tube Q20 is also show in Fig. 3, switching tube Q20 drain electrodes access PFC chips U1 by resistance R33
FB pins, grid access ZD20 anode, source ground.What it was constituted is PFC chips U1 low voltage protection circuit part.
When exchange input is less than preset value, chip U1 FB pins are forced to be reduced to UVP so that chip U1 enters standby mould
Formula.When exchange input is higher than preset value, chip U1 just starts normal work.Such as preset value is taken in 85VAC, then defeated when exchanging
When entering to be less than 85VAC, ZD20 is not turned on, metal-oxide-semiconductor Q20 cut-offs, and partial pressure is R34 under FB, and IC is in UVP states (under-voltage guarantor
Shield)；When exchange input is higher than 85VAC, ZD20 reverse-conductings, metal-oxide-semiconductor Q20 is turned on, and partial pressure is by R33//R34 under FB, normal point
Pressure point, main output is normally set up.
In such scheme it has been noted that in PFC boost unit, the assists winding one of the supply transformer PFC T1
The power port that PFC chips are connected to by commutation diode D32, the first steady module of string is held, thus draws what the present invention was solved
Second technical problem, i.e., how to allow PFC chips U1 can steady operation, and then ensure to be optimal the adjustment of power factor (PF)
Value.The present invention solves this technical problem by being designed with the steady module of the first string in PFC power port VCC.
Referring to Fig. 2, in Active PFC boosting unit, assists winding one end of the supply transformer PFC T1 leads to
Crossing the first steady module of string that the commutation diode D32 connected includes：
Switching tube Q32, the base stage of the switching tube Q32 is grounded by voltage-stabiliser tube ZD31, the colelctor electrode of the switching tube Q32
It is connected with commutation diode D32 negative electrode and is connected to the base stage of itself, the emitter stage of the switching tube Q32 by resistance R46
PFC chips U1 power port is accessed by diode D34, and voltage-stabiliser tube is also associated with diode D34 cathode side
ZD30 and the electric capacity C38 for being connected in parallel on voltage-stabiliser tube ZD30 two ends, the voltage-stabiliser tube ZD31, voltage-stabiliser tube ZD30 plus earth；It is described
Commutation diode D32 negative electrode is also grounded by electric capacity C36.Electric capacity C36, electric capacity C38 use polar capacitor, and the two is played
Effect to signal filtering.
The signal output part that primary side winding one end of the supply transformer PFC T1 exports filter unit with rectification is connected,
The other end outwards draws the signal output for constituting Active PFC boosting unit by diode D2, thermistor RTH1, and
The signal output part is provided with filtering bulky capacitor C5.C5 uses ruby electric capacity, in defined operating temperature range, the electricity
Appearance can work stably in a long term, and the maximum DC voltage that it can bear is in 450V, i.e., rated operational voltage is in 450V.
When the signal that rectification exports filter unit output flows into supply transformer PFC T1 primary side winding, become in power supply
The induced signal that depressor PFC T1 assists windings are produced first passes through commutation diode D32 rectifications, is then fed into switching tube Q32's
Colelctor electrode.Now because voltage-stabiliser tube ZD31 presence causes switching tube Q32 base stage voltage stabilizing to 18V, switching tube Q32 output 3
Pin (i.e. emitter stage) then can pass through D34 one-way conductions again in 18-0.3V or so, and ZD30 is protected again, it is ensured that power because
Plain correcting controlling chip U1 supply port VCC perseverances are operated in 17V or so.No matter now how circuit voltage fluctuates, voltage/electricity
Stream impact is all born on switching tube Q32, and chip U1 is played a very good protection.Wherein voltage-stabiliser tube ZD31 work electricity
Stream only need to 1mA less than, it is possible to electric current needed for providing work to chip U1, voltage-stabiliser tube ZD31 is low in energy consumption, circuit working stability
Reliably.In some lamp control systems, mu balanced circuit does not design switching tube, and that voltage/current will be loaded surely completely
In pressure pipe, such as fruit chip U1 is operated under case of heavy load, and voltage-stabiliser tube power consumption is high, fragile.
Referring to Fig. 2, for supply transformer PFC T1, its assists winding also draws centre cap (pin6) access ground
Line, and diode D33 is additionally provided between centre cap and commutation diode D32, prevent there is a little direct current point in PFC inductance
Electric current is measured, inductance saturation is prevented, magnetic hystersis loss is reduced.Mos pipes Q1 is open-minded, and electric current crosses C35, D33；Mos pipes Q1 is turned off, electric current mistake
C35, D32.Plus C35 blocking flow component.The supply transformer PFC T1 assists winding other end (pin5) is connected by resistance R37
To U1 ZCD pins (5 pin), it is used to sense ancillary coil voltage, and whether inductance during detection CrM (critical mode of operation) work
Loss of excitation.
PFC boost unit provided by the present invention is also chip in addition to improving to chip U1 powerup issue
The switching tube Q1 of U1 drivings devises first switch pipe accelerator module.The first switch pipe accelerator module is used to accelerate switching tube Q1
Rising edge when being turned on and off and trailing edge time.Because the speed of the edge time of switching tube Q1 switching is determined
The Q1 loss opened and closed.Therefore control it necessary.That is, PFC boost unit is entered as the present invention
One step improvement project is：With reference to Fig. 2, there is the PFC chips U1 signal for being used to drive external switch pipe Q1 to drive port (7
Pin-DRV pins), it is provided with first switch pipe accelerator module between the signal driving port and switching tube Q1 grid；It is described
Switching tube Q1 source electrode is grounded by resistance R8, and drain electrode is connected to the other end of supply transformer PFC T1 primary side windings.
The first switch pipe accelerator module includes voltage-stabiliser tube D31, diode D6, resistance R6, resistance R7 and switching tube Q2；Wherein, institute
State the base stage that signal driving port is connected to voltage-stabiliser tube D31 negative electrode, diode D6 anode and switching tube Q2, the voltage-stabiliser tube
D31 plus earth, the negative electrode of the diode D6 is connected by resistance R6 with switching tube Q1 grid, the switching tube Q2's
Emitter stage is connected by resistance R7 with switching tube Q1 grid, and the colelctor electrode of the switching tube Q2 is connected to switching tube Q1 source
Pole.Resistance R5 of the resistance size at 10K ohm is additionally provided between the grid and source electrode of the switching tube Q1, to protect out
Close pipe Q1.
When controlling switch pipe Q1 is turned on, the control signal of chip U1 signals driving port (DRV pins) output passes through D6
And R6, Q1 grids are delivered to, R6 resistances are smaller, promote Q1 fast conductings, and rising time is short；When controlling Q1 to disconnect, chip U1
The control signal of signal driving port (DRV pins) output is loaded into switching tube Q2 base stage so that Q2 is turned on, now metal-oxide-semiconductor
Q1 signals pass through diode D6, and resistance R6, R7, triode Q2 are released, and then accelerate shut-off.
For PFC chips, it also has FB pins (1 pin), and the pin is reverse for chip internal error amplifier
Input, when this pin voltage higher than OVP voltages or less than UVP voltages or it is hanging when, chip is stopped.Therefore
Overvoltage and under-voltage protection are carried out using the pin.See from Fig. 2, FB pins by divider resistance R30, R31, R32,
RJ10, R34 are from circuit signal output end pressure, to realize overvoltage protection.Chip U1 under-voltage protection electricity is shown in Fig. 3
Road part.When exchange input is less than preset value, chip U1 FB pins are forced to be reduced to UVP so that chip U1 is entered
Standby mode.When exchange input is higher than preset value, chip U1 just starts normal work.Such as preset value is taken in 85VAC, then when
When exchange input is less than 85VAC, ZD20 is not turned on, metal-oxide-semiconductor Q20 cut-offs, and partial pressure is R34 under FB, and IC is in UVP states and (owed
Pressure protection)；When exchange input is higher than 85VAC, ZD20 reverse-conductings, metal-oxide-semiconductor Q20 conductings, partial pressure is by R33//R34 under FB, just
Normal dividing point, main output is normally set up.
The PFC boost unit of the above-mentioned offer of the present invention is to control IC chip to go adjustment defeated by special Active PFC
Enter the waveform of electric current, the phase difference Current Voltage is compensated, and then improve the power factor (PF) of power network, ensure that power network is efficient
Utilization rate, belong to active PFC.
Also include in lamp control system provided by the present invention and be arranged on rear side of Active PFC boosting unit
LLC resonant converter control unit.The invention solves the problems that the 3rd technical problem, i.e., how to allow LLC resonance control chips
U900 can steady operation, and then ensure, to the stability contorting of resonance oscillation semi-bridge, to make to be connected to the LC Resonance Neural Networks on rear side of resonance oscillation semi-bridge
Network, synchronous rectification unit can normally export the low-voltage dc signal required for light fixture.The present invention passes through the power port in LLC
VCC is designed with the steady module of the second string to solve this technical problem.
Referring to Fig. 4 and Fig. 2 is combined, the LLC resonant converter control unit includes：LLC resonance control chip U900, its
With supply port, assists winding one end of the supply transformer PFC T1 is also led to by the commutation diode D32
Pressure point A, the pressure point A are connected to the supply port by the second steady module of string, and the steady module of second string includes：Open
Pipe Q10 is closed, its colelctor electrode is connected to pressure point A and the base stage of itself is connected to by resistance R22；Its base stage passes through voltage-stabiliser tube
ZD10 accesses ground and voltage-stabiliser tube ZD10 anode is earth terminal；Its emitter stage is grounded by electric capacity C17 and connect by resistance J11
Enter supply port；Pressure point is provided with electric capacity C16 between A and ground, and electric capacity C60 and electric capacity are provided between supply port and ground
C61.Here, electric capacity C16 is filtered, C60 pairs of electric capacity C61 and electric capacity to A points signal (i.e. into the signal before the steady unit of string)
The signal that steady unit of going here and there is exported is filtered, to ensure that the voltage stabilization for being input to chip U900VCC is noiseless.
In such scheme, A point voltages are sent to switching tube Q10 colelctor electrode, now because voltage-stabiliser tube ZD10 presence makes
Switching tube Q10 base stage voltage stabilizing is obtained to 13V, the switching tube Q10 pin of output 3 (i.e. emitter stage) perseverance is in 13-0.3V or so, Ran Houtong
The supply port VCC that resistance J11 is applied to resonance control chip U900 is crossed, ensures resonance control chip U900 feeder ear with this
Mouth VCC perseverances are operated in 12.5V or so.No matter now how circuit voltage fluctuates, voltage/current impact is all born in switching tube
On Q10, chip U900 is played a very good protection.Wherein voltage-stabiliser tube ZD10 operating current only needs to 1mA less than just
Electric current needed for work can be provided to chip U900, voltage-stabiliser tube ZD10 is low in energy consumption, and circuit is stable and reliable in work.In some light fixture controls
In system processed, mu balanced circuit does not design switching tube, and that voltage/current will be loaded on voltage-stabiliser tube completely so that voltage-stabiliser tube
Power consumption is high, fragile.
LLC resonant converter control unit involved in the present invention similarly also includes with traditional LLC controlled resonant converter
There is a resonance oscillation semi-bridge (being made up of switching tube Q5 and switching tube Q6), chip U900 is by controlling in resonance oscillation semi-bridge leading for two switching tubes
It is logical to adjust their working frequency (abbreviation switching frequency) with closing, output voltage size is adjusted with this, and two switching tubes
Dutycycle is to maintain constant in whole control process.This is different, PWM controls from the energy transmission means of PWM controller
The energy transmission of device processed is what is controlled by the dutycycle of main switch.In light load, working frequency gradually rises, and is operated in drop
In intermediate pressure section；And in heavy duty, working frequency is gradually reduced, it is operated in boosting region.
As shown in figure 4, the LLC resonant converter control unit also include by switching tube Q5 and switching tube Q6 constitute it is humorous
Shake half-bridge；Wherein, the source electrode of the switching tube Q5 be connected with the drain electrode of the switching tube Q6 composition cascaded structure and concatenation point to
Outer extraction is connected to a LC resonant network；The drain electrode of the switching tube Q5 receives what is exported from Active PFC boosting unit
Voltage signal, grid passes through second switch pipe accelerator module and LLC resonance control chips U900 high-side driver output pin
(HVG pins) is connected；The source ground of the switching tube Q6, grid is controlled by the 3rd switching tube accelerator module and LLC resonance
Chip U900 low side driving output pin (LVG pins) is connected.Chip U900 is made by controlling Q5 and Q6 conducting and closing
LC resonant networks constantly transfer electrical energy into secondary output end, then by secondary output end synchronous rectification cell translation into
Direct current, is loaded on lamp load.And between the respective drive pin of switching tube Q5 and switching tube Q6 grid and chip
The purpose of design respective switch pipe accelerator module is to prevent Q5, Q6 from simultaneously turning on.
In such scheme, the second switch pipe accelerator module mentioned includes voltage-stabiliser tube ZD50, diode D56, resistance
R13, resistance R9 and switching tube Q51；Referring to Fig. 4, (HVG pins are 15 to resonance control chip U900 high-side driver output pin
Pin) be connected to voltage-stabiliser tube ZD50 negative electrode, diode D56 anode and switching tube Q51 base stage, the sun of the voltage-stabiliser tube ZD50
Pole is connected to the high-side driver floating ground pin (OUT pins i.e. 14 pin) of resonance control chip, and the negative electrode of the diode D56 passes through
Resistance R13 is connected with switching tube Q5 grid, the grid phase that the emitter stage of the switching tube Q51 passes through resistance R9 and switching tube Q5
Even, the colelctor electrode of the switching tube Q51 is connected to switching tube Q5 source electrode.Also set between the grid and source electrode of the switching tube Q5
Resistance R10 of the resistance size at 10K ohm is equipped with, to protection switch pipe Q5.Operation principle is as follows：When controlling Q5 conductings,
The control signal of chip U900 HVG pins output passes through D56 and R13, delivers to Q5 grids, R13 resistances are smaller, promote Q5 quick
Conducting, rising time is short；When controlling Q5 to disconnect, the control signal of chip U900 HVG pins output is loaded into switching tube
Q51 base stage so that Q51 is turned on, now metal-oxide-semiconductor Q5 signals pass through diode D56, resistance R13, R9, switching tube Q51 is obtained
To release, and then accelerate shut-off.Here switching tube Q51 preferentially uses PNP type triode.
In such scheme, the 3rd switching tube accelerator module mentioned has and second switch pipe accelerator module identical knot
Structure, i.e., including voltage-stabiliser tube ZD51, diode D55, resistance R15, resistance R11 and switching tube Q50；Referring to Fig. 4, resonance control chip
Low side driving output pin (LVG pins) be connected to voltage-stabiliser tube ZD51 negative electrode, diode D55 anode and switching tube Q50
Base stage, the plus earth of the voltage-stabiliser tube ZD51, the negative electrode of the diode D55 passes through resistance R15 and switching tube Q6 grid
Extremely it is connected, the emitter stage of the switching tube Q50 is connected by resistance R11 with switching tube Q6 grid, the collection of the switching tube Q50
Electrode is connected to switching tube Q6 source electrode.Resistance size is additionally provided with 10K Europe between the grid and source electrode of the switching tube Q6
The resistance R12 of nurse, to protection switch pipe Q6.Operation principle is as follows：When controlling Q6 conductings, chip U900 LVG pins are defeated
The control signal gone out passes through D55 and R15, delivers to Q6 grids, R15 resistances are smaller, promote Q6 fast conductings, and rising time is short；
When controlling Q6 to disconnect, the control signal of chip U900 LVG pins output is loaded into switching tube Q50 base stage so that Q50 is led
Logical, now metal-oxide-semiconductor Q6 signals pass through diode D55, and resistance R15, R11, switching tube Q50 are released, and then accelerate to close
It is disconnected.Here switching tube Q50 preferentially uses PNP type triode.
In second switch pipe accelerator module, 10 ohm of the preferential values of R13, the preferential values of R9 are in 15 Europe；And opened the 3rd
Close in pipe accelerator module, the preferential values of R15 are 15 ohm, and the preferential values of R11 are at 10 ohm.So design resistance size causes
Upper and lower half-bridge driven and vent discharge resistance are different, ensure upper and lower bridge conducting dead time with this, are prevented effectively from appearance
The exception that lower metal-oxide-semiconductor (Q5, Q6) simultaneously turns on.
As can be seen here, the present invention in PFC boost unit for switching tube Q1 design first switch pipe accelerator module, with
It is that switching tube Q5, Q6 second switch pipe accelerator module designed and the 3rd switching tube accelerate in LLC resonant converter control unit
Unit has identical circuit structure.What operation principle was also similar to.
Referring to Fig. 4 and Fig. 5 is combined, the LLC resonant converter control unit also includes resonance transformer LLC T1, it has
There are armature winding, secondary windings, primary accessory power supply winding and secondary accessory power supply winding；Wherein, the armature winding is used for
Constitute LC resonant networks；The secondary windings is used to connect the output rectification filter list being made up of two synchronous rectification control chips
Member；The primary accessory power supply winding is used to be connected to pressure point A by diode D11 and resistance R81；The secondary auxiliary electricity
Source winding, which is used to produce by the 3rd steady module of string, can make the output voltage/electric current adjustment unit normal work of lamp control system
Supply voltage VCC3 (as shown in Figure 7).
Here, LC resonant networks are made up of resonance transformer LLC T1 armature winding L (pin12-pin13) and C33.And
Synchronous rectification 1 (pin2-pin5) and synchronous rectification 2 (pin1-pin4) are provided with resonance transformer T1 secondary windings side, with
To being conveyed to street lamp after resonance transformer T1 secondary induction voltage signal progress rectification.Here synchronous rectification 1 and synchronization is whole
Stream 2 is constituted using TEA1791A synchronous rectifications chip, i.e. U101 and U102.Detailed circuit is referring to Fig. 5.Wherein, U101 is constituted
Synchronous rectification 1 be the alternating current of transformer induction positive half cycle work, U102 constitute synchronous rectification 2 be in transformer sense
The negative half period work for the alternating current answered, to cause the whole cycle of alternating current of transformer induction to have rectification output.Light fixture connects
It is connected between VOUT+ and VOUT-.Resonance transformer LLC T1 primary accessory power supply winding pin9-pin10 is designed with diode
D11, electric capacity C15 and C18, diode D11 negative electrodes are linked into A points by resistance R81.Resonance transformer LLC T1 secondary auxiliary
Power supply winding pin6-pin7 is used to induced voltage producing a stable VCC3 (referring to Fig. 7) by the 3rd steady module of string, is
Output voltage/electric current adjustment unit provides stabilized power source.This be the invention solves the problems that the 4th technical problem.
Referring to Fig. 8, which show the principle design figure of the output voltage/electric current adjustment unit of the present invention.Which includes
Output voltage adjustment unit and output current adjustment unit, the output voltage adjustment unit are obtained from output rectification filter unit
The voltage signal V+ to light fixture is exported, the output current adjustment unit obtains output to light fixture from output rectification filter unit
Current signal (is gathered so that have what is changed and change with output current between ground SGND and ground SPGND by inspection leakage resistance J101
Electrical potential difference).It is as improvements over the prior art of the present invention：
As shown in Figure 8 and with reference to Fig. 4 and Fig. 7, the output voltage adjustment unit and output current adjustment unit share same
One supply voltage VCC3, and supply voltage VCC3 be passed through by secondary accessory power supply winding (pin6-pin7) it is above-mentioned described
What the 3rd steady module of string was obtained；Wherein, the steady module of the 3rd string includes triode Q200, voltage-stabiliser tube ZD200 and resistance
R200；One end (pin6) ground connection SGND of the secondary accessory power supply winding, the other end (pin7) passes through diode D200, resistance
R203 access triodes Q200 colelctor electrode；The negative electrode of the voltage-stabiliser tube ZD200 is connected with triode Q200 base stage, anode
It is grounded SGND；The two ends of the resistance R200 are respectively connecting to triode Q200 colelctor electrode and base stage；The triode Q200
Emitter stage export the supply voltage VCC3.
Operation principle is as follows：The induced signal produced on secondary accessory power supply winding pin6-pin7 passes through D200, R203
Triode Q200 colelctor electrode is sent to, now because voltage-stabiliser tube ZD200 presence causes triode Q200 base stage voltage stabilizing to arrive
13V, therefore the triode Q200 pin of output 3 (i.e. emitter stage) is permanent in 13-0.3V or so, so that exporting perseverance is operated in a 12.5V left sides
Right supply voltage VCC3.In this case, no matter how road voltage fluctuates, voltage/current impact is all born in triode
On Q200, there is any influence without the supply voltage VCC3 on output.Be further, resistance R203 and resistance R203 with
The connected one end of triode Q200 colelctor electrodes is additionally provided with filter capacitor C202, C201.The supply voltage VCC3 also passes through electricity
Hold C205, C134 access ground SGND.Herein, C205, C134 are mainly is filtered processing to the supply voltage VCC3 of acquisition,
So that the supply voltage VCC3 obtained, which is in, disturbs small even glitch-free state.
Referring to Fig. 8 and Fig. 4 is combined, the output voltage adjustment unit is mainly made up of amplifier U107A, in amplifier U107A
Homophase input (3 pin) and anti-phase input (2 pin) be respectively arranged with voltage reference point 1. with voltage reference point 2..And amplifier
U107A output (1 pin) is connected to optocoupler U4 2 pin.Signal is fed back to LLC resonance control chips U900 by optocoupler U4 4 pin.
With reference to Fig. 8 circuit, operation principle is as follows：Changed when output rectification filter unit is exported to the voltage signal V+ of light fixture
When, the voltage of the voltage reference point of the pin of inverting input 2 2. will change, and now amplifier U107A is then by the voltage signal
It is compared with the reference voltage V REF of the pin of in-phase input end 3 (i.e. voltage reference point 1.), and then in amplifier U107A output ends 1
Pin exports a higher or relatively low level.From Fig. 3 circuit connecting relation, the higher or relatively low level is directly affected
The conducting degree of light emitting diode into optocoupler U4, and then have influence on the letter of optocoupler U4 forward end LLC resonance control chip feedback
Number height, when LLC resonance control chips are received will be by adjusting switching frequency after the signal of optocoupler U4 feedbacks so that output
Voltage is adjusted.Therefore, optocoupler U4 plays constant pressure effect herein.
The voltage sample circuit includes resistance R147, the resistance R148 and variable resistor SVR2 (variable resistors of series connection
SVR2 two fixing ends series connection)；Wherein, the other end of the resistance R147 obtains output to lamp from output rectification filter unit
The voltage signal V+ of tool, variable resistor SVR2 another fixing end access ground SGND, sliding end access ground SGND and pass through electric capacity
C138 is connected to the pressure point between resistance R147 and resistance R148；The inverting input of the amplifier U107A passes through resistance
R140 is connected to the pressure point (i.e. voltage reference point in Fig. 2 is 2.).
Referring to Fig. 8 and Fig. 4 is combined, the output current adjustment unit is mainly made up of amplifier U107C, in amplifier U107C
Homophase input (10 pin) and anti-phase input (9 pin) be respectively arranged with current reference point 1. with current reference point 2..And amplifier
U107C output (8 pin) is connected to optocoupler U4 2 pin.Signal is fed back to LLC resonance control chips U900 by optocoupler U4 4 pin.
Because output filter rectification unit exports current signal to light fixture from the sampled resistance J101 flow directions ground SPGND of ground SGND.Cause
This, is the size △ U=I*J101 of the electrical potential difference with electrical potential difference between ground SGND and ground SPGND.The change of output current
The voltage difference between ground SGND and ground SPGND can be caused to change, output current regulation of the present invention is based on this
What voltage difference was carried out.
Operation principle：When the voltage of the pin of amplifier U107C in-phase input ends 10 is higher than 9 pin of inverting input, amplifier
The level of the pin of U107C output ends 8 is higher, and optocoupler U4 conducting is affected；When the voltage of the pin of amplifier U107C in-phase input ends 10
When less than 9 pin of inverting input, the level of the pin of amplifier U107C output ends 8 is relatively low, and optocoupler U4 conducting degree is increased.Afterwards
Continuous principle is similar with the output voltage adjustment unit principle of above-mentioned analysis, repeats no more here.
When output is bigger than normal than the Io of setting to the electric current of light fixture, the voltage difference increase between ground SGND and ground SPGND makes
Ground SPGND voltage reduction is obtained, now the voltage increase between VREF and SPGND, electric current increase, the electric current base of homophase input 10
1. voltage increase on schedule, higher than the pin of anti-phase input 9, the level of amplifier U107C outputs 8 is higher, optocoupler U4 conducting degree by
To influence.Then optocoupler U4 feedback is passed through, LLC resonance control chip will reduce output current by adjusting switching frequency
It is adjusted to the electric current Io of setting.Conversely, when output rectification filter unit exports less than normal than the Io of setting to the electric current of light fixture, light
Coupling U4 conducting degree is increased, and by optocoupler U4 feedback, LLC resonance control chip will make output by adjusting switching frequency
Electric current increase is adjusted to the electric current Io of setting.Therefore, optocoupler U4 plays constant current effect herein.
In above-mentioned given output voltage adjustment unit and output current adjustment unit, variable resistor is provided with, its
Middle variable resistor SVR2 can be used for the size of regulation output voltage V+ manually, and variable resistor SVR1 can be used for adjusting defeated manually
Go out the size of electric current.
It is to provide a kind of DC failure detector circuits as another technical problem to be solved of the invention.Referring to Fig. 6, this hair
Bright described lamp control system also includes DC fault detection units, and it includes：Switching tube Q802, it drains outwards to draw and constituted
DC fault detects end, source ground, grid is connected to by point resistance R804, voltage-stabiliser tube ZD800 and resistance R802 in series
Unit is pressed, resistance R804 one end obtains DC voltage, resistance R804 other end connection from the output rectification filter unit
To voltage-stabiliser tube ZD800 negative electrode, resistance R802 one end is connected with voltage-stabiliser tube ZD800 anode, resistance R802 another termination
Ground, the grid of the switching tube Q802 is connected to voltage-stabiliser tube ZD800 anode；Meanwhile, the resistance R804 other end is also passed through
Resistance R803 is grounded.
The DC failure detector circuit peripheral elements that the present invention is designed are few, and set by divider resistance R804, R802 with voltage-stabiliser tube
It is fixed, it can accurately detect D/C voltage.In specific detection, DC fault detects end is detected by external microcontroller, and now field is imitated
Transistor Q802 drain electrode is answered to access a test voltage by external pull-up resistor.Therefore, if lamp control system it is defeated
Go out the street lamp DC voltage of rectification filtering unit output in normal range of operation, then metal-oxide-semiconductor Q802 can be turned on, 3 pin are leakage
Pole exports low level, otherwise exports high level.When it is low level that external microcontroller, which knows the pin, then light fixture control is judged
The direct current of system is normally exported, and when it is high level that external microcontroller, which knows the pin, then judges the direct current of lamp control system
Fail normal output.
As the extension program of the present invention, lamp control system of the present invention is also provided with output over-voltage protection unit,
It is connected between output rectification filter unit and LLC resonant converter control unit.Referring to Fig. 9 and Fig. 4 is combined, this was exported
Pressure protection location is mainly made up of optocoupler U3 and precision voltage regulator TL431.When output voltage changes, precision voltage regulator
TL431 1 pin level changes, so that optocoupler U3 conductings degree is affected, and then to feed back to the change of LLC resonance
The signal of parallel operation control unit changes.Then switching frequency is adjusted by LLC resonant converter control unit, makes output voltage
Occurs opposite change.
As the extension program of the present invention, lamp control system of the present invention is on the basis of output current adjustment unit
It is also provided with three-in-one light adjusting circuit.As shown in Figure 10, the three-in-one light adjusting circuit mainly includes：
The voltage follow module being made up of operational amplifier U107D, the signal output part of the operational amplifier U107D leads to
Cross diode D300 and be connected to current reference divider resistance, and output current regulation control is connected to by current reference divider resistance
Unit processed；Operational amplifier U107D in-phase input end is connected to diode D302 anode, two pole by resistance R310
External dimmer signal is received between pipe D302 negative electrode (VR1 ends) and ground SGND, the external dimmer signal includes voltage magnitude
For 10V pwm signal, 1-10V voltage signals or 10K-100K dimming resistors；
Wherein, the anode of the diode D302 is connected to operational amplifier U108A homophase input by resistance R308
End, using the external dimmer signal accessed between diode D302 negative electrode and ground SGND as operational amplifier U108A its
In homophase input all the way；Another road homophase input of the operational amplifier U108A is the benchmark electricity connected by resistance R301
Signal Vref1, the reference voltage signal Vref1 is pressed to be generated by a reference voltage generation module；The diode D302
Anode operational amplifier U108A output end is also connected to by resistance R309；The operational amplifier U108A's is anti-phase defeated
Enter end to be grounded by resistance R302, and be additionally provided between inverting input and output end resistance R303；Also, two pole
Pipe D302 anode is also grounded by diode D301, voltage-stabiliser tube ZD301, and diode D301 negative electrode is with voltage-stabiliser tube ZD301's
Negative electrode is connected, voltage-stabiliser tube ZD301 plus earth.
Above-mentioned current reference divider resistance is in series by resistance R307 and resistance R146, the operational amplifier
U107D output signal sequentially passes through one of electricity of resistance R307 and resistance R146 feeding output current regulation units
Flow datum mark.Specifically, operational amplifier U107D output signal is the electric current for being sent to output current regulation unit
1. datum mark, is shown in Figure 10.
The operation principle of the above-mentioned three-in-one light adjusting circuits of LED is as follows：
The voltage mode light modulation of generation 1-10V voltage signals or the PWM mode light modulation of generation pwm signal are terminated as VR1
When, amplifier U108A is operated in saturation region, and now VR1 ends are clamped at V, i.e. NetHLG-1 voltages for V+0.3, by amplifier
U107D connects the voltage at current reference divider resistance end for V+0.3 with subsequent.Now, the electric current base of output current adjustment unit
Voltage 1. correspondingly changes on schedule, and light fixture just can follow applied voltage to be dimmed.Because pwm signal is believed for square wave
Number, when its dutycycle changes, its voltage effective value V can also change.Here it is the voltage using PWM square-wave signals
Virtual value V adjusts to carry out lamp light-regulating.When voltage mode light modulation or PWM mode light modulation are by voltage modulated to 1V, light fixture is electric
Stream is dark with 10% output；When voltage mode light modulator or PWM mode light modulator are by voltage modulated to 10V, lamp current
100% output, it is brighter.
When VR1 terminates 10K-100K dimming resistors, amplifier U108A homophase input is electric equivalent to the regulation is added
Resistance, changes amplifier positive feedback input, amplifier U108A is operated in linear amplification region, therefore after amplifier U108A,
1V-10V linear convergent rates will be presented in NetHLG-1 voltages with 10K-100K, and then cause connection current reference divider resistance end electricity
The 1-10V to change with resistive linearity is pressed, lamp current can be exported with 10-100%.
In above-mentioned three kinds of light-modulating modes, for voltage light-modulating mode and PWM light-modulating modes, amplifier U108A is operated in
Saturation region, amplifier U107D output signal size depends on the voltage swing at VR1 ends.For resistance light-modulating mode, amplifier
U108A play a part of by resistance signal linear transformation be voltage signal and input to amplifier U107D in-phase end.
As shown in Figure 10, when what light modulation of VR1 ends does not connect, supply voltage VCC3 is constituted by Q301 and ZD302
After string is steady, 12.5V Vcc1 voltages are generated.Now U108A exports 10V, and U107D amplifier input is 10V, by voltage follow
Afterwards, the voltage at connection current reference divider resistance end is then 10V, fully loaded 100% output of light fixture.
It is main to use when not accessing three-in-one light adjusting circuit of the present invention for output current adjustment unit
In the electric current of LED is constant in some setting value, when actual current is higher compared with the electric current of setting, fed back by optocoupler U4
To LLC resonance control chips, and then actual current reduction is controlled to approach setting value；Otherwise similarly.Therefore do not access three-in-one
The output current regulation unit of light adjusting circuit is most only to carry out feedback constant flow regulation to LED load electric current.And when output electricity
Stream regulation unit has been accessed after three-in-one light adjusting circuit, just can be by adjusting the size of LED load electric current so that LED roads
The brightness of lamp is adjusted, and the light modulation to LED is realized with this.
Finally illustrate, the above embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted, although with reference to compared with
The present invention is described in detail good embodiment, it will be understood by those within the art that, can be to skill of the invention
Art scheme is modified or equivalent substitution, and without departing from the objective and scope of technical solution of the present invention, it all should cover at this
Among the right of invention.
Claims (10)
1. a kind of lamp control system, including：
The exchange input filter unit of processing is filtered to city's electric signal；
The rectification that the AC signal of the exchange input filter unit output is converted into direct current signal exports filter unit；
The direct current signal of rectification output filter unit output is received, and carries out the Active PFC boosting unit of boost action,
PFC chips U1 and supply transformer PFC T1 are provided with the Active PFC boosting unit, it is characterised in that
Assists winding one end of the supply transformer PFC T1 is connected to PFC by commutation diode D32, the first steady module of string
The power port of chip；Meanwhile, it is provided with AC failures between the exchange input filter unit and rectification output filter unit
Detection unit；The AC fault detection units include：
Photoelectrical coupler U800 and switching tube Q801；Wherein,
The light-emitting diodes tube anode of the photoelectrical coupler U800 is inputted through the resistance R801 signals for being connected to the steady module of the first string
End, negative electrode is connected to switching tube Q801 drain electrode；The phototriode base stage of the photoelectrical coupler U800 receives light-emitting diodes
The light that pipe is sent, colelctor electrode outwards draws composition AC fault detects end, grounded emitter；The source electrode of the switching tube Q801 connects
Ground, grid is connected to rectification and voltage division unit through resistance R809, and is connected to exchange input filter unit by rectification and voltage division unit
Between rectification output filter unit.
2. lamp control system as claimed in claim 1, it is characterised in that in AC fault detection units, the rectification point
Pressure unit includes：
Commutation diode D14 and commutation diode D15, the anode of the two is respectively connecting to exchange input filter unit and rectification is defeated
Two signal wires gone out between filter unit, the negative electrode of the two is grounded by electric capacity C64, the electric capacity C65 of series connection；
The partial pressure unit constituted, the resistance R25 other end are sequentially connected in series by resistance R25, resistance R26, resistance R27 and resistance R28
Access commutation diode D14 and commutation diode D15 negative electrode, resistance R28 other end access ground；
Wherein, one end access switching tube Q801 of resistance R809 grid, the other end is connected to electricity by voltage-stabiliser tube ZD20
The concatenation point between R27 and resistance R28 is hindered, the anode of the voltage-stabiliser tube ZD20 also accesses ground by resistance R29.
3. lamp control system as claimed in claim 2, it is characterised in that in Active PFC boosting unit：
The signal output part that primary side winding one end of the supply transformer PFC T1 exports filter unit with rectification is connected, another
The signal output for constituting Active PFC boosting unit is outwards drawn at end by diode D2, thermistor RTH1,
The first steady mould of string that assists winding one end of the supply transformer PFC T1 is connected by the commutation diode D32
Block includes：Switching tube Q32, the base stage of the switching tube Q32 is grounded by voltage-stabiliser tube ZD31, the colelctor electrode of the switching tube Q32
It is connected with commutation diode D32 negative electrode and is connected to the base stage of itself, the emitter stage of the switching tube Q32 by resistance R46
PFC chips U1 power port is accessed by diode D34, and voltage-stabiliser tube is also associated with diode D34 cathode side
ZD30 and the electric capacity C38 for being connected in parallel on voltage-stabiliser tube ZD30 two ends, the voltage-stabiliser tube ZD31, voltage-stabiliser tube ZD30 plus earth；It is described
Commutation diode D32 negative electrode is also grounded by electric capacity C36.
4. lamp control system as claimed in claim 3, it is characterised in that the PFC chips U1, which has, to be used to drive outside
Switching tube Q1 signal driving port, is provided with first switch pipe between the signal driving port and switching tube Q1 grid and adds
Fast unit；The source electrode of the switching tube Q1 is grounded by resistance R8, and drain electrode is connected to supply transformer PFC T1 primary side windings
The other end.
5. lamp control system as claimed in claim 4, it is characterised in that also single including being arranged on Active PFC boosting
LLC resonant converter control unit on rear side of member；The LLC resonant converter control unit includes：
LLC resonance control chip U900, it has supply port, and assists winding one end of the supply transformer PFC T1 passes through
The commutation diode D32 also leads to pressure point A, the pressure point A and is connected to the feeder ear by the second steady module of string
Mouthful, the steady module of second string includes：
Switching tube Q10, its colelctor electrode is connected to pressure point A and the base stage of itself is connected to by resistance R22；Its base stage passes through
Voltage-stabiliser tube ZD10 accesses ground and voltage-stabiliser tube ZD10 anode is earth terminal；Its emitter stage is grounded by electric capacity C17 and passes through electricity
Hinder J11 access supply ports；Pressure point is provided with electric capacity C16 between A and ground, and electric capacity C60 is provided between supply port and ground
With electric capacity C61.
6. lamp control system as claimed in claim 5, it is characterised in that the LLC resonant converter control unit is also wrapped
Include the resonance oscillation semi-bridge being made up of switching tube Q5 and switching tube Q6；Wherein,
The source electrode of the switching tube Q5 is connected with the drain electrode of the switching tube Q6 constitutes cascaded structure and the outside company of extraction of concatenation point
It is connected to a LC resonant network；
The drain electrode of the switching tube Q5 receives the voltage signal exported from Active PFC boosting unit, and grid is opened by second
Pipe accelerator module is closed with LLC resonance control chips U900 high-side driver output pin to be connected；
The source ground of the switching tube Q6, grid is by the 3rd switching tube accelerator module with LLC resonance control chips U900's
Low side driving output pin is connected.
7. lamp control system as claimed in claim 6, it is characterised in that the LLC resonant converter control unit is also wrapped
Include resonance transformer LLC T1, its have armature winding, secondary windings, primary accessory power supply winding and secondary accessory power supply around
Group；Wherein, the armature winding is used to constitute LC resonant networks；The secondary windings is used to connect to be controlled by two synchronous rectifications
The output rectification filter unit that chip is constituted；The primary accessory power supply winding is used to pass through diode D11 and resistance R81 connections
To pressure point A；The secondary accessory power supply winding, which is used to produce by the 3rd steady module of string, can make the output of lamp control system
The supply voltage VCC3 of voltage and current adjustment unit normal work.
8. lamp control system as claimed in claim 7, it is characterised in that the steady module of the 3rd string includes triode
Q200, voltage-stabiliser tube ZD200 and resistance R200；One end ground connection SGND of the secondary accessory power supply winding, the other end passes through two poles
Pipe D200, resistance R203 access triode Q200 colelctor electrode；The negative electrode of the voltage-stabiliser tube ZD200 and triode Q200 base stage
Connected, plus earth SGND；The two ends of the resistance R200 are respectively connecting to triode Q200 colelctor electrode and base stage；Described three
Pole pipe Q200 emitter stage exports the supply voltage VCC3.
9. lamp control system as claimed in claim 8, it is characterised in that also including DC fault detection units；
The DC fault detection units include：
Switching tube Q802, it, which drains outwards to draw, constitutes DC fault detects ends, source ground, grid be connected to by resistance R804,
Voltage-stabiliser tube ZD800 and resistance R802 partial pressure units in series, resistance R804 one end is from the output rectification filter unit
DC voltage is obtained, the resistance R804 other end is connected to voltage-stabiliser tube ZD800 negative electrode, resistance R802 one end and voltage-stabiliser tube
ZD800 anode is connected, and resistance R802 other end ground connection, the grid of the switching tube Q802 is connected to voltage-stabiliser tube ZD800's
Anode；Meanwhile, the resistance R804 other end is also grounded through resistance R803.
10. lamp control system as claimed in claim 9, it is characterised in that the first switch pipe accelerator module, second
Switching tube accelerator module and the 3rd switching tube accelerator module are by the first voltage-stabiliser tube, the first diode, first resistor, the second electricity
Resistance, 3rd resistor and first switch pipe are constituted；
Wherein, the base stage of the negative electrode of the first voltage-stabiliser tube, the anode of the first diode and first switch pipe is commonly connected to corresponding core
The corresponding port of piece, the plus earth of the first voltage-stabiliser tube, the negative electrode of the first diode passes through first resistor and switching tube to be driven
Grid be connected, the emitter stage of first switch pipe is connected by second resistance with the grid of switching tube to be driven, first switch pipe
Colelctor electrode be connected to the source electrode of switching tube to be driven；3rd resistor is connected between the grid of switching tube to be driven and source electrode.
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| CN106853792B (en) * | 2016-12-30 | 2023-06-16 | 华域视觉科技(上海)有限公司 | Method for controlling automobile steering lamp to generate time sequence lighting effect |
| CN108401312B (en) * | 2017-02-07 | 2024-03-26 | 常州星宇车灯股份有限公司 | LED drive control system |
| CN107166347A (en) * | 2017-06-30 | 2017-09-15 | 上海唯源光电科技有限公司 | It is a kind of that there is the light fixture for aiding in sleep function |
| CN108196184B (en) * | 2018-01-25 | 2023-06-20 | 昆明理工大学 | XL series boost chip detection device and method |
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| CN105934043A (en) | 2016-09-07 |
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