CN105992435B - Anti-interference LED overvoltage protective module and anti-interference LED overvoltage protective system - Google Patents
Anti-interference LED overvoltage protective module and anti-interference LED overvoltage protective system Download PDFInfo
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- CN105992435B CN105992435B CN201510076494.6A CN201510076494A CN105992435B CN 105992435 B CN105992435 B CN 105992435B CN 201510076494 A CN201510076494 A CN 201510076494A CN 105992435 B CN105992435 B CN 105992435B
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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
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The present invention provides a kind of anti-interference LED overvoltage protective module and anti-interference LED overvoltage protective systems; anti-interference LED overvoltage protective module includes the elements such as a voltage-stabiliser tube; the overvoltage protection setting resistance, the minimum demagnetization time capacitor and the minimum demagnetization time comparator setting one minimum demagnetization time; when the circuit demagnetization time that the demagnetization detection unit detects being less than the minimum demagnetization time, the Overvoltage protecting unit detects output voltage over-voltage.The present invention realizes the setting of minimum demagnetization time by being pulled to the overvoltage protection setting resistance of voltage-stabiliser tube; to realize jamproof over-voltage protecting function; overcome the at high cost of traditional overvoltage protection mode, peripheral circuit is complicated, or the technical issues of vulnerable to interference.
Description
Technical field
The present invention relates to the overvoltage protection detection technique fields more particularly to a kind of anti-interference LED over-voltage in Switching Power Supply
Protective module and anti-interference LED overvoltage protective system.
Background technique
The function of LED drive power is to provide the constant output electric current of LED light, but if output LED opens a way or hair
The case where raw other get higher output voltage, LED drive power must make corresponding measure and be no more than output electricity by output voltage
The pressure resistance of appearance, otherwise output capacitance will be destroyed.It is general individual using one in traditional LED drive power scheme
Transformer winding detects output voltage, then by electric resistance partial pressure, is input to chip individual foot position directly to detect output
Voltage, therefore, it is determined that whether driving power occurs over-voltage.
Traditional overvoltage protection scheme increases the volume and cost of the entire driving power of LED, in order to detect pressure point,
It needs to increase a transformer winding, two divider resistances, and chip and also wants more detection foot positions, be not suitable for existing market
The development trend of LED small size, low cost.
Fig. 1 is the circuit diagram of overvoltage protection part in LED drive power in the prior art.It is one given by Fig. 1
The typical case figure of kind voltage-dropping type Buck circuit, the circuit generally include rectifier bridge Z1, input filter capacitor C1, power supply capacitor
C2, output capacitance C3, transformer primary winding L1, transformer auxiliary winding L2, rectifier diode D1, supplying resistance R1, load
LED, power switch tube M1, current sampling resistor R2, divider resistance R3, divider resistance R4, for electric diode D2, first control core
Piece 101.When power switch tube M1 conducting, transformer primary winding L1 electric current rises, and electric current flows through current sampling resistor R2 production
Raw voltage signal, when the voltage signal reaches the current reference voltage in the first control chip 101, power switch tube M1 is closed
Disconnected, the electric current inside transformer primary winding L1 is by rectifying tube D1 afterflow, when the first control chip 101 detects two poles of rectification
When electric current in pipe D1 is zero, power switch tube M1 is opened.When power switch tube M1 shutdown, on transformer primary winding L1
Voltage difference be load LED output voltage, the voltage incuded on transformer auxiliary winding L2 at this time be also output voltage just
Than relationship, proportionality coefficient is the turn ratio of winding.If load LED open circuit, output voltage are got higher at this time, if FB voltage is higher than core
The internal reference of piece, the first control 101 decision-making system of chip enter overvoltage condition, realize defencive function.
Used another technical solution is to eliminate transformer auxiliary winding in Fig. 1 in the prior art, passes through detection
In the rectifier diode current stream time come determine output voltage whether over-voltage.Fig. 2 is the drive of another kind LED in the prior art
The circuit diagram of overvoltage protection part, the circuit generally include in dynamic power supply: rectifier bridge Z1, input filter capacitor C1, power supply
Capacitor C2, output capacitance C3, transformer primary winding L1, rectifier diode D1, supplying resistance R1, load LED, current sample electricity
R2, overvoltage protection resistance R31, load LED, the second control chip 201 are hindered, is generally arranged one by overvoltage protection resistance R31
Regular time constant is more than this set time constant when the current stream time in rectifier diode, then it is assumed that chip does not have
There is over-voltage, if the current stream time in rectifier diode is shorter than this set time constant, then it is assumed that over-voltage occurs in chip.
The problem of this overvoltage protection scheme is: the ohmically electric current of overvoltage protection often receives the influence of parasitic parameter on circuit board,
If the finite resistance of pcb board material or scaling powder to generate leakage current on circuit mesohigh element to overvoltage protection resistance, interference
The ohmically electric current of overvoltage protection makes the reduction of overvoltage protection voltage, thus be easy by false triggering, in batch production, or it is different
Temperature and humidity conditions under there is the phenomenon that flashing light.
The overvoltage crowbar precision of existing Fig. 1 scheme is higher, but needs to increase auxiliary winding and several elements, more
It is complicated；The overvoltage crowbar of Fig. 2 scheme is then easy to be interfered, and there is a problem of precision and produces in batches bad.
Summary of the invention
For the defects in the prior art, the object of the present invention is to provide a kind of anti-interference LED overvoltage protective module and
Resistance is arranged to realize setting for minimum demagnetization time in anti-interference LED overvoltage protective system, the overvoltage protection by being pulled to VCC
It sets, to realize jamproof over-voltage protecting function, overcomes the at high cost of traditional overvoltage protection mode, peripheral circuit is complicated,
Or the technical issues of vulnerable to interference.
According to an aspect of the present invention, a kind of anti-interference LED overvoltage protective module is provided, which is characterized in that including one
Voltage-stabiliser tube, overvoltage protection setting resistance, an operational amplifier, a signal metal-oxide-semiconductor, minimum demagnetization a time capacitor, a logic
Switch, a minimum demagnetization time comparator, demagnetization a detection unit, an Overvoltage protecting unit, a rest-set flip-flop, one drive circuit
An and peak point current comparator；
The voltage-stabiliser tube connects the overvoltage protection and resistance is arranged, and the overvoltage protection setting resistance connects the operation and puts
One input terminal of big device, and connect with the source level of the signal metal-oxide-semiconductor, described in the output end connection of the operational amplifier
Signal metal-oxide-semiconductor grid, the drain electrode connection of the signal metal-oxide-semiconductor minimum demagnetization time capacitor, and with the logic switch
Connection, the minimum demagnetization time capacitor connect an input terminal of the minimum demagnetization time comparator, the minimum simultaneously
The output end of demagnetization time comparator connects the Overvoltage protecting unit；
The demagnetization detection unit connects the Overvoltage protecting unit, and connect with an input terminal of rest-set flip-flop,
The output end of the peak point current comparator connects another input terminal of the rest-set flip-flop, and one of the rest-set flip-flop is defeated
Outlet connects the driving circuit, and connect with the controlled stage of the logic switch；
Wherein, the overvoltage protection setting resistance, the minimum demagnetization time capacitor and the minimum demagnetization time ratio
Compared with the minimum demagnetization time of device setting one, it is less than the minimum demagnetization when the circuit demagnetization time that the demagnetization detection unit detects
When the time, the Overvoltage protecting unit detects output voltage over-voltage.
Preferably, another input terminal of the operational amplifier connects a fixed voltage, the fixed voltage and described steady
Pressure pipe voltage is proportional.
Preferably, the source voltage that the operational amplifier controls the signal metal-oxide-semiconductor is equal to the fixed voltage.
Preferably, the charging current of the minimum demagnetization time capacitor is equal to or is proportional to the overvoltage protection setting electricity
Electric current in resistance.
Preferably, another input terminal of the minimum demagnetization time comparator connects a reference voltage, the reference voltage
It immobilizes.
Preferably, the Overvoltage protecting unit minimum demagnetization time comparator output signal and demagnetization detection are single
The sequencing of first output signal, and judge whether LED driver is in normal operating conditions or output overvoltage state according to this.
The present invention also provides a kind of anti-interference LED overvoltage protective systems, which is characterized in that continues including a power inductance, one
Flow diode, an output capacitance, a bus capacitor, a supplying resistance, a power supply capacitor, a power switch tube, a sampling resistor,
Anti-interference LED overvoltage protective module as described above；
The drain electrode of the power switch tube is electrically connected the power inductance and the freewheeling diode, the function respectively
The source electrode of rate switching tube is electrically connected the sampling resistor, and the power inductance is electrically connected the output capacitance；
The bus capacitor is electrically connected the freewheeling diode, and the supplying resistance is coupled in the bus capacitor and supplies
Between capacitor, another termination circuit of power supply capacitor；
The anti-interference LED overvoltage protective module is coupled in the power by the input terminal of the peak point current comparator
Between the source electrode of switching tube and the peak point current sampling unit, it is electrically connected to by the output end of the driving circuit described
The grid of power switch tube；The power supply capacitor is in parallel with the voltage-stabiliser tube in the anti-interference LED overvoltage protective module；
Wherein, when the voltage on the peak point current comparator reaches a reference voltage, the anti-interference LED over-voltage is protected
It protects module and turns off the power switch tube；When the demagnetization detection unit detects that the power inductor current drops to zero,
The power switch tube is connected in the anti-interference LED overvoltage protective module.
Preferably, the power switch tube is composed in series by an injectron and a low tension switch pipe, when the power
When switching tube is composed in series by the injectron and low tension switch pipe, the demagnetization detection unit is coupled in the height and presses off
It closes between pipe and low tension switch pipe.
Preferably, the anti-interference LED overvoltage protective system is buck configuration, lifting laminated structure or Flyback configuration.
Compared with prior art, the present invention is with following the utility model has the advantages that the present invention is pulled to voltage-stabiliser tube electricity by control
The voltage at the overvoltage protection setting resistance both ends of pressure obtains an accurate overvoltage protection setting electric current, overvoltage protection setting electricity
Stream is minimum demagnetization time capacitor charging, and the accurate minimum demagnetization time is obtained in each switch periods.When the demagnetization
When detection unit detects that the circuit actual demagnetization time is earlier than the minimum demagnetization time, decision circuitry over-voltage.Over-voltage inspection
The cost of survey mode is low, and peripheral circuit is simple.Meanwhile when there is the problems such as leakage current in circuit practical application, minimum demagnetization
Time rises, and overvoltage protection voltage increases, and avoids the risk of overvoltage protection false triggering.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention,
Objects and advantages will become more apparent upon:
Fig. 1 is the realization circuit diagram of existing LED overvoltage crowbar；
Fig. 2 is the realization circuit diagram of another existing LED overvoltage protection；
Fig. 3 is the schematic diagram of one embodiment of anti-interference LED overvoltage protective system of the present invention；
Fig. 4 is the working waveform figure of anti-interference LED overvoltage protective system key point of the present invention；
Fig. 5 is the schematic diagram of the anti-interference LED overvoltage protective system embodiment of source level of the present invention driving.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field
Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field
For personnel, without departing from the inventive concept of the premise, various modifications and improvements can be made.These belong to the present invention
Protection scope.
The anti-interference overvoltage protection detection control module of the present invention and anti-interference overvoltage protective system are used in no auxiliary winding
LED power scheme in.The present invention is had found by analyzing the realization circuit of existing LED drive power overvoltage protection, works as use
More accurate to the intelligence sample of output voltage when auxiliary winding detects output voltage, overvoltage protection voltage is also relatively accurate, but its
Circuit is complicated, needs auxiliary winding, divider resistance and controls chip pin position accordingly.And it is relatively simple, connection circuit
The minimum demagnetization time mode detection of resistance setting then to encounter overvoltage protection precision poor, the problems such as vulnerable to electric leakage interference.Based on
Upper problem, for the present invention by being pulled to the overvoltage protection set-up mode and related circuit of VCC, it is simple accurate to realize, and
Jamproof LED over-voltage detection function.With reference to the accompanying drawing to anti-interference LED overvoltage protective module provided by the invention and anti-
Interference LED overvoltage protective system elaborates.
With reference to Fig. 3, the schematic diagram of one embodiment of anti-interference LED overvoltage protective system of the present invention is opened for LED
Common voltage-dropping type Buck structure in powered-down source.The anti-interference LED overvoltage protective system includes: a rectifier bridge Z1, a power
Inductance L11, a sustained diode 11, an output capacitance C3, a bus capacitor C11, a supplying resistance R1, a power supply capacitor C2,
One power switch tube M1, a peak point current sampling resistor RCS and an anti-interference LED overvoltage protective module 300.
In the present embodiment, the peak point current sampling unit uses peak point current sampling resistor RCS to obtain power
The source voltage terminal of switching tube；In other embodiments, other voltage sample sides can also be used in the peak point current sampling unit
Formula samples the source voltage terminal of power switch tube.
The input terminal of rectifier bridge connects input ac voltage, and two output ends of rectifier bridge are coupled in bus capacitor C11's
Both ends, the one end power inductance L1 are coupled to bus capacitor C11 by parallel output capacitor C3 and load LED；Power inductance L1 is another
One end is coupled to bus capacitor C11 by sustained diode 11.One end of the drain electrode connection power inductance L1 of power switch tube M1
And the anode of sustained diode 11, the source electrode of power switch tube M1 are grounded by peak point current sampling resistor RCS.Power supply electricity
It hinders the one end R1 and connects bus capacitor C11, the supplying resistance R1 other end connects power supply capacitor C2.
When power switch tube M1 conducting, the electric current on power inductance L1 flow through power switch tube M1 and it is linear on
It rises, slope is (Vin-Vout)/L, wherein Vin is the voltage on bus capacitor C1, and Vout is the electricity on output capacitance C3
Pressure, L are the inductance of power inductance L1.When power switch tube M1 shutdown, the electric current on power inductance L1 flows through afterflow
Diode D1 and linear decline, slope Vout/L.
The anti-interference LED overvoltage protective module 300 include: a voltage-stabiliser tube ZD1, an overvoltage protection setting resistance ROVP,
When one operational amplifier 301, a signal metal-oxide-semiconductor M2, a minimum demagnetization time capacitor C4, a logic switch S1, a minimum demagnetization
Between comparator 302, one demagnetize detection unit 304, an Overvoltage protecting unit 303, a rest-set flip-flop 305, one drive circuit 306 with
An and peak point current comparator 307.Wherein, in addition to resistance ROVP is arranged in overvoltage protection, the anti-interference LED overvoltage protection mould
Each component on block 300 can integrate to be realized on one piece of control chip.
One input terminal of the peak point current comparator 307 is coupled in the source electrode and sampling resistor of power switch tube M1
Between RCS, another input terminal connects reference voltage REF1, makes peak value when the source level electric current of the power switch tube M1 rises to
When voltage and reference voltage REF1 equal on current sampling resistor RCS, the peak point current comparator output signal indicates electricity
Inducing current reaches the peak value of setting.
The output end of the peak point current comparator 307 is electrically connected to the rest-set flip-flop 305；When the peak point current
When jumping in the output signal of comparator 307, rest-set flip-flop 305 resets.The output end of the rest-set flip-flop 305 is connected to driving
The output end of circuit 306, the driving circuit 306 is connected to the grid of power switch tube M1, when the rest-set flip-flop 305 resets
When, the power switch tube M1 shutdown.The grid of the input terminal connection power switch tube M1 of the demagnetization detection unit 304, institute
The output end for stating demagnetization detection unit is connected to another input terminal of the rest-set flip-flop 305, when the demagnetization detection unit
304 when detecting that the electric current of power inductance L1 drops to zero, 305 set of rest-set flip-flop, the power switch tube M1 conducting.
The voltage-stabiliser tube ZD1 is coupled between supplying resistance R1 and power supply capacitor C1, the voltage on the power supply capacitor C1
It is that overvoltage crowbar and logic drive circuit are powered for VCC voltage.Described in the overvoltage protection setting resistance ROVP connection
The source voltage of the source level of voltage-stabiliser tube ZD1 and the signal metal-oxide-semiconductor M2, signal metal-oxide-semiconductor M2 is denoted as VOVP.The operation amplifier
The input terminal connection one of device 301 is directly proportional to voltage-stabiliser tube ZD1 voltage VCC and is less than the fixed voltage VCC/N of VCC, example
Such as VCC/2, another input terminal connects the overvoltage protection and resistance RVOP is arranged, and the output end of the operational amplifier 301 connects
The grid of the signal metal-oxide-semiconductor M2 is connect, the work of operational amplifier 301 is in closed loop states, i.e. the two of operational amplifier 301
Input terminal voltage is equal, VOVP=VCC/N.Then the electric current on the overvoltage protection setting resistance ROVP is IOVP=(VCC-
VOVP)/ROVP=VCC* (1-1/N)/ROVP.The electric current is only related with VCC voltage and ROVP resistance.
The drain electrode of the signal metal-oxide-semiconductor M2 is coupled to the minimum demagnetization time capacitor C4, logic switch S1 and minimum
Demagnetize time comparator 302, and the output end of the minimum demagnetization time comparator 302 connects the Overvoltage protecting unit 303,
IOVP flows through signal metal-oxide-semiconductor M2, and flows into minimum demagnetization time capacitor C4, in an actual embodiment, when flowing into minimum demagnetization
Between capacitor C4 electric current can be IVOP mirror image, that is, be proportional to IVOP.Control of the logic switch S1 by the rest-set flip-flop 305
System, when the power switch M1 is closed, the logic switch S1 is also switched off, while the voltage on minimum demagnetization time capacitor C4
It begins to ramp up, when the voltage on minimum demagnetization time capacitor C4 rises to a fixed voltage REF2, the minimum demagnetization time
Comparator 302 outputs signal to the Overvoltage protecting unit 303.
The output end of the demagnetization detection unit 304 is also connected to the Overvoltage protecting unit 303.In each duty cycle
After middle power switch M1 is closed, the output signal of the demagnetization detection unit 304 of Overvoltage protecting unit 303 and
The sequencing of the output signal of the minimum demagnetization time comparator 302.When the output signal of the demagnetization detection unit 304
Earlier than the minimum demagnetization time comparator 302 output signal when, trigger open-circuit-protection logic.
With reference to Fig. 4, the operation principle schematic diagram of anti-interference LED overvoltage protective system of the present invention.Wherein, power inductance
L1 work is in critical continuous conduction mode, and when power switch tube M1 conducting, power inductance L1 electric current rises, when power switch tube M1 is closed
When disconnected, the decline of power inductance L1 electric current, when power inductance L1 electric current drops to zero, 304 output signal of detection unit of demagnetizing makes
Power switch tube M1 is again turned on, and completes a duty cycle.Circuit work is in open-circuit condition in Fig. 4, due to not having load LED
Energy is consumed, so LED driver output voltage is gradually increasing.When power switch tube M1 conducting, logic switch S1 is also switched on,
Minimum demagnetization time capacitor C4 voltage remains zero, and after power switch tube M1 is closed, logic switch S1 is also switched off, minimum demagnetization
Time capacitor C4 voltage starts linear rise, and the slope risen depends on VCC voltage and ROVP resistance, when minimum demagnetization
Between capacitor C4 voltage when rising to REF2, minimum demagnetization time comparator 302 outputs signal to the Overvoltage protecting unit 303.
If still occurred without the output signal of minimum demagnetization time comparator 302 when demagnetizing 304 output signal of detection unit,
Then system judges output voltage over-voltage, trigger protection logic.
With reference to Fig. 5, another embodiment of anti-interference LED overvoltage protective system of the present invention, the embodiment uses source
Grade driving method, power switch tube M1 in Fig. 3 by Fig. 5 high-voltage circuit breaker pipe M1H and low-voltage power switch pipe M1L go here and there
Connection replaces, meanwhile, the input signal of demagnetization detection unit 304 is changed to be coupled in Fig. 5 by the grid of the power switch M1 in Fig. 3
High-voltage circuit breaker M1H and low-voltage power switch M1L midpoint.The anti-interference LED overvoltage protection of source level driving shown in fig. 5
System embodiment is similar with the anti-interference LED overvoltage protective system embodiment principle of gate-drive shown in Fig. 3, herein not
It repeats again.
Anti-interference LED overvoltage protective system of the present invention in practical applications, when on LED driver circuit plate using helping
Solder flux or in hot and humid environment, high pressure component is likely to occur leakage current to OVP current potential, which increases described
Electric current on signal metal-oxide-semiconductor M2 then makes minimum demagnetization so that the charging current on minimum demagnetization time capacitor C4 be made to increase
Time shortens, and increase the output over-voltage protection voltage of LED driver.Avoiding electric leakage in the prior art makes output over-voltage protection
Voltage decline and the phenomenon that false triggering overvoltage protection and risk.
The above is only a preferred embodiment of the present invention, the present invention also can be applied to Flyback configuration simultaneously, boost
In structure or lifting laminated structure.It should be pointed out that not departing from the principle of the invention for those skilled in the art
Under the premise of, several improvements and modifications can also be made, these modifications and embellishments should also be considered as the scope of protection of the present invention.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring substantive content of the invention.
Claims (8)
1. a kind of anti-interference LED overvoltage protective module, which is characterized in that resistance, one is arranged including a voltage-stabiliser tube, an overvoltage protection
Operational amplifier, a signal metal-oxide-semiconductor, a minimum demagnetization time capacitor, a logic switch, minimum demagnetization a time comparator, one
Demagnetize detection unit, an Overvoltage protecting unit, a rest-set flip-flop, one drive circuit and a peak point current comparator；
The cathode of the voltage-stabiliser tube connects the first end and power input of the overvoltage protection setting resistance, the voltage-stabiliser tube
Plus earth, the second end of overvoltage protection setting resistance connect a negative input of the operational amplifier, described
The source electrode of signal metal-oxide-semiconductor, the output end of the operational amplifier connect the grid of the signal metal-oxide-semiconductor；
One electrode input end of the operational amplifier connects a fixed voltage；
The first end and the first of the logic switch of the drain electrode connection of the signal metal-oxide-semiconductor minimum demagnetization time capacitor
End, the first end of the minimum demagnetization time capacitor connect an anode input of the minimum demagnetization time comparator simultaneously
End, the second end of minimum demagnetization time capacitor and the second end of the logic switch are all grounded, and the minimum demagnetization time compares
The output end of device connects the Overvoltage protecting unit；A negative input and a base for the minimum demagnetization time comparator
Quasi- voltage connection；
The output end of the demagnetization detection unit connects the Overvoltage protecting unit, and connects with an input terminal of rest-set flip-flop
It connecing, the output end of the peak point current comparator connects another input terminal of the rest-set flip-flop, and the one of the rest-set flip-flop
A output end connects the driving circuit, and connect with the controlled stage of the logic switch；
One input terminal of the peak point current comparator is coupled in the source electrode of a power switch tube and a peak point current is adopted
Between sample resistance, another input terminal connects another reference voltage, makes when the source current of the power switch tube rises to
When voltage and equal reference voltage on peak point current sampling resistor, the peak point current comparator output signal indicates inductance
Electric current reaches the peak value of setting；
The output end of the peak point current comparator is electrically connected to the rest-set flip-flop；It is defeated when the peak point current comparator
When jumping on signal out, rest-set flip-flop resets；The output end of the rest-set flip-flop is connected to driving circuit, the driving circuit
Output end is connected to the grid of power switch tube, when the rest-set flip-flop resets, the power switch tube shutdown；The demagnetization
The grid of the input terminal connection power switch tube of detection unit, when the demagnetization detection unit detects under the electric current of power inductance
When being down to zero, rest-set flip-flop set, the power switch tube conducting；
Wherein, the overvoltage protection setting resistance, the minimum demagnetization time capacitor and the minimum demagnetization time comparator
Setting one is minimum to demagnetize the time, is less than the minimum demagnetization time when the circuit demagnetization time that the demagnetization detection unit detects
When, the Overvoltage protecting unit detects output voltage over-voltage.
2. anti-interference LED overvoltage protective module according to claim 1, which is characterized in that the fixed voltage and described
Pressure stabilizing tube voltage is proportional.
3. anti-interference LED overvoltage protective module according to claim 2, which is characterized in that the operational amplifier control
The source voltage of the signal metal-oxide-semiconductor is equal to the fixed voltage.
4. anti-interference LED overvoltage protective module according to claim 1, which is characterized in that the minimum demagnetization time electricity
The charging current of appearance is equal to or is proportional to the overvoltage protection and ohmically electric current is arranged.
5. anti-interference LED overvoltage protective module according to claim 1, which is characterized in that the minimum demagnetization time ratio
Another input terminal compared with device connects a reference voltage, which immobilizes.
6. anti-interference LED overvoltage protective module according to claim 1, which is characterized in that the Overvoltage protecting unit ratio
The sequencing of the minimum demagnetization time comparator output signal and detection unit output signal of demagnetizing, and judge according to this
Whether LED driver is in normal operating conditions or output overvoltage state.
7. a kind of anti-interference LED overvoltage protective system, which is characterized in that including a power inductance, a freewheeling diode, an output
Capacitor, a bus capacitor, a supplying resistance, a power supply capacitor, a power switch tube, a peak point current sampling resistor, right are wanted
Anti-interference LED overvoltage protective module described in asking 1；
The input terminal of rectifier bridge connects input ac voltage, the positive output end of the first end connection rectifier bridge of bus capacitor, bus
The negative output terminal of the second end connection rectifier bridge of capacitor；The first end of power inductance passes through output capacitance and load parallel with one another
LED is coupled to the first end of bus capacitor；The second end of power inductance is connected with the anode of freewheeling diode, freewheeling diode
Cathode be coupled to the first end of bus capacitor；The second end of the drain electrode connection power inductance of power switch tube, power switch tube
Source electrode be grounded by peak point current sampling resistor；The first end of the first end connection bus capacitor of supplying resistance, supplying resistance
Second end connection power supply capacitor first end, power supply capacitor second end ground connection；
The anti-interference LED overvoltage protective module is coupled in the power switch by the input terminal of the peak point current comparator
Between the source electrode of pipe and the peak point current sampling unit, the power is electrically connected to by the output end of the driving circuit
The grid of switching tube；The power supply capacitor is in parallel with the voltage-stabiliser tube in the anti-interference LED overvoltage protective module；
Wherein, when the voltage on the peak point current comparator reaches a reference voltage, the anti-interference LED overvoltage protection mould
Block turns off the power switch tube；It is described when the demagnetization detection unit detects that the power inductor current drops to zero
The power switch tube is connected in anti-interference LED overvoltage protective module.
8. anti-interference LED overvoltage protective system according to claim 7, which is characterized in that the power switch tube is by one
Injectron and a low tension switch pipe are composed in series, when the power switch tube is by the injectron and low tension switch pipe
When being composed in series, the demagnetization detection unit is coupled between the injectron and low tension switch pipe.
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| CN201510076494.6A CN105992435B (en) | 2015-02-12 | 2015-02-12 | Anti-interference LED overvoltage protective module and anti-interference LED overvoltage protective system |
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| CN201510076494.6A CN105992435B (en) | 2015-02-12 | 2015-02-12 | Anti-interference LED overvoltage protective module and anti-interference LED overvoltage protective system |
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| CN106535396B (en) * | 2016-11-04 | 2018-04-13 | 辉芒微电子（深圳）有限公司 | A kind of jamproof constant current LED drive circuit |
| CN108123418B (en) * | 2016-11-29 | 2021-04-16 | 华润微集成电路(无锡)有限公司 | LED drive overvoltage protection circuit |
| CN108135045B (en) * | 2016-11-30 | 2023-12-26 | 华润微集成电路(无锡)有限公司 | Output overvoltage protection method and circuit |
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| CN109496008A (en) * | 2017-09-12 | 2019-03-19 | 上海明石光电科技有限公司 | LED drive circuit, LED electron rectifier and LED illumination device |
| CN108093528B (en) * | 2018-01-10 | 2024-03-26 | 上海灿瑞科技股份有限公司 | Overvoltage protection circuit applied to LED driving chip |
| CN108495420B (en) * | 2018-05-09 | 2023-11-28 | 福建吉艾普光影科技有限公司 | Rapid detection system of multipath constant-current output driving plate |
| CN108650744A (en) * | 2018-06-27 | 2018-10-12 | 北京集创北方科技股份有限公司 | LED drive control devices, LED drive circuit and LED light emission device |
| CN110831283B (en) * | 2019-11-22 | 2021-11-23 | 上海芯飞半导体技术有限公司 | LED driving power supply and controller thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102724799A (en) * | 2012-06-28 | 2012-10-10 | 上海晶丰明源半导体有限公司 | Light emitting diode (LED) drive circuit and method without auxiliary winding |
| CN102802318A (en) * | 2012-08-28 | 2012-11-28 | 绍兴光大芯业微电子有限公司 | Flyback-type quick-start LED (Light-Emitting Diode) drive circuit structure |
| CN103199499A (en) * | 2013-04-22 | 2013-07-10 | 上海晶丰明源半导体有限公司 | Overvoltage protection circuit in LED (Light Emitting Diode) driving power supply, and LED driving power supply |
| CN203167339U (en) * | 2013-01-08 | 2013-08-28 | 苏州聚元微电子有限公司 | LED drive circuit without auxiliary winding |
| CN103887770A (en) * | 2013-12-13 | 2014-06-25 | 上海新进半导体制造有限公司 | Overvoltage protective circuit in LED driving power supply without auxiliary winding |
| CN104302053A (en) * | 2014-10-09 | 2015-01-21 | 泉芯电子技术(深圳)有限公司 | LED constant current source output detection control circuit and control method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9722498B2 (en) * | 2013-01-10 | 2017-08-01 | Alcatel Lucent | Control circuit for switching power converters with synchronous rectifiers |
-
2015
- 2015-02-12 CN CN201510076494.6A patent/CN105992435B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102724799A (en) * | 2012-06-28 | 2012-10-10 | 上海晶丰明源半导体有限公司 | Light emitting diode (LED) drive circuit and method without auxiliary winding |
| CN102802318A (en) * | 2012-08-28 | 2012-11-28 | 绍兴光大芯业微电子有限公司 | Flyback-type quick-start LED (Light-Emitting Diode) drive circuit structure |
| CN203167339U (en) * | 2013-01-08 | 2013-08-28 | 苏州聚元微电子有限公司 | LED drive circuit without auxiliary winding |
| CN103199499A (en) * | 2013-04-22 | 2013-07-10 | 上海晶丰明源半导体有限公司 | Overvoltage protection circuit in LED (Light Emitting Diode) driving power supply, and LED driving power supply |
| CN103887770A (en) * | 2013-12-13 | 2014-06-25 | 上海新进半导体制造有限公司 | Overvoltage protective circuit in LED driving power supply without auxiliary winding |
| CN104302053A (en) * | 2014-10-09 | 2015-01-21 | 泉芯电子技术(深圳)有限公司 | LED constant current source output detection control circuit and control method thereof |
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