CN105338681B - Current stabilization drive device - Google Patents
Current stabilization drive device Download PDFInfo
- Publication number
- CN105338681B CN105338681B CN201410279299.9A CN201410279299A CN105338681B CN 105338681 B CN105338681 B CN 105338681B CN 201410279299 A CN201410279299 A CN 201410279299A CN 105338681 B CN105338681 B CN 105338681B
- Authority
- CN
- China
- Prior art keywords
- input
- switch
- output
- door
- comparator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The invention mainly relates to the system that current stabilization is controlled in electric power controller, more precisely, being related to a kind of current stabilization control system that can be applied to manage LED.Control is implemented to the controlling switch concatenated on the transformer by the primary side in flyback transformer, drive signal is produced to drive the controlling switch, so as to realize the secondary in flyback transformer to realize constant current output, take this to carry out driving power LED component in a manner of constant current.
Description
Technical field
The invention mainly relates to the system that current stabilization is controlled in electric power controller, more precisely, being related to one kind can answer
For managing LED current stabilization control system.
Background technology
Conventional LED light characteristic is described generally as, rather than the function of direct correlation voltage relevant with current function,
LED forward voltage drop minor variations can sometimes induce larger curent change, and LED luminance mutation is embodied from sense organ.One
As think that using constant pressure driving the uniformity of LED luminance can not be ensured completely, take this further to suppress LED long-term reliability or
Life-span, and trigger negative light decay.Except LED field, part civil equipment, charger for mobile phone etc. must also possess constant current
The functional character of output.
For example in the equipment such as low-power LED driver and charger for mobile phone, anti exciting converter is widely used, its cost
Cheap is a very big advantage.Anti exciting converter is a kind of isolated form structure, inputs and export mutually isolated, control circuit one
As be placed on primary side, the anti exciting converter of traditional current constant control needs to sample the output current of a secondary, and by the letter after modulation
Number the control chip of primary side is delivered to by optical coupling, the current signal and the current reference set are carried out in control chip
Compare, the dutycycle of anti exciting converter is controlled with this, form negative feedback control, realize constant current output.LMDS Light Coupled Device can be deposited
In common problem of aging, directly influence is exactly the bad stability of power supply, in addition the current sampling circuit of secondary output
The cost of power supply is added with optical coupling, reduces the market competitiveness.Charger for mobile phone and low-power LED driver increasingly become
Generally it is to adopt so as to realize that primary side can realize constant current control in removing optical coupling in anti exciting converter
The output current of the secondary of sample one, and directly individually controlled in anti exciting converter primary side side.
The content of the invention
In a kind of current stabilization drive device of the present invention, including：One is connected in series in a primary side of flyback transformer 224
Switching transistor M1 on winding；One original edge voltage detection unit 230, by the input voltage vin of the primary side of flyback transformer 224
First partial pressure compared with a first reference voltage V2 after, by comparative result export give a driving pulse produce mould
Block 240；One primary current sampling module 235, have a sampling resistor R1 be connected on switching transistor M1 and earth terminal it
Between, second partial pressure of the input voltage vin of the primary side of flyback transformer 224 and sampling resistor R1 both ends are gathered or captured
After voltage is compared, comparative result is exported to driving pulse generation module 240；One saw-toothed wave generator 250, receive and
The first via, the second road pulse signal and the 3rd tunnel, the 4th road pulse signal that self-driven pulses generation module 240 is transmitted, and it is defeated
Go out sawtooth waveforms to driving pulse generation module 240；One secondary current detection unit 260, by the vice-side winding of flyback transformer 224
After the output voltage Vout of output is compared with the second reference voltage V4, produces the first via, the second tunnel control signal and export
To driving pulse generation module 240；Caused first via pulse signal is used for driving switch by driving pulse generation module 240
Transistor M1 switch switching state.Wherein in a switch periods of flyback transformer 224, fixed switching transistor (M1)
ON time (T1), to improve and improve power factor, obtain higher power factor Power Factor, and nationality is by presetting
The ratio between time (T2) and switch periods time (Ts) that the vice-side winding of flyback transformer 224 is connected are a steady state value, to realize perseverance
Flow output current Iout.
Above-mentioned current stabilization drive device, original edge voltage detection unit 230 include a comparator 101 and by two resistance (R2,
R3) composition divider, resistance (R2, R3) be connected in series in the primary side winding of flyback transformer 224 input and earth terminal it
Between, the positive input of comparator 101 is connected to common node between two resistance (R2, R3), two resistance (R2, R3)
Between common node be used to provide the first partial pressure, the reverse input end of comparator 101 is connected to a fixed reference voltage V2,
The comparative result of comparator 101 is exported to driving pulse generation module 240.
Above-mentioned current stabilization drive device, primary current sampling module 235 include a comparator 102 and by two resistance (R4,
R5) composition divider, resistance (R4, R5) be connected in series in the primary side winding of flyback transformer 224 input and earth terminal it
Between, the positive input of comparator 102 is connected to the node between sampling resistor R1 and switching transistor M1, comparator 102
Reverse input end is connected to common node between two resistance (R4, R5), two resistance (common node between (R4, R5)
For providing the second partial pressure, the comparative result of comparator 102 is exported to driving pulse generation module 240.
Above-mentioned current stabilization drive device, in driving pulse generation module 240, at least also includes：One the first rest-set flip-flop
105, the comparative result that primary current sampling module 235 exports is transferred to the R input of the first rest-set flip-flop 105, and the first RS is touched
The S inputs of hair device 105 are connected in driving pulse generation module 240 output end with door 104, and this and door 104
An input receive from original edge voltage detection unit 230 export comparative result, a Q of the first rest-set flip-flop 105
Output end produces first via pulse signal；One the second rest-set flip-flop 108, first via pulse signal transmission produce to driving pulse
After the input of one square-wave oscillator 112 of module 240, square-wave oscillator 112 triggers caused oscillator signal from its output
Hold synchronous driving to the R input of the second rest-set flip-flop 108, one of driving pulse generation module 240 with one of door 110 it is defeated
Enter end, driving pulse generation module 240 a square-wave oscillator 113 input, and square-wave oscillator 113 export shake
Swing signal and another input with door 110 is transferred to by a phase inverter 109 of driving pulse generation module 240, with door
After 110 output end is connected to the input of a square-wave oscillator 114 of driving pulse generation module 240, square-wave oscillator
Oscillator signal caused by 114 triggerings sends the S inputs of the second rest-set flip-flop 108 to from its output end；One the 3rd RS triggering
Device 111, the R input of the 3rd rest-set flip-flop 111 is connected to the output end of door 110, and the S of the 3rd rest-set flip-flop 111 is inputted
End receives the first via control signal of the output of secondary current detection unit 260, and the Q outputs of the 3rd rest-set flip-flop 111
End produces the 3rd road pulse signal and oneOutput end produces the second road pulse signal；One pulse width modulated comparator 128,
Its reverse input end receives the sawtooth waveforms exported from saw-toothed wave generator 250, and its positive input is connected to second with reference to electricity
V4 is pressed, and the 4th road pulse signal for sending saw-toothed wave generator 250 to is produced in output end；Wherein, secondary current detection is single
Second tunnel control signals of the output of member 260 export one to driving pulse generation module 240 input with door 129,
The output end of pulse width modulated comparator 128 is connected to another input of door 129, the output end, the 2nd RS with door 129 are touched
One Q output of hair device 108 is correspondingly connected respectively to one of driving pulse generation module 240 and two inputs of door 107
End, and an OR gate 106 of driving pulse generation module 240 is connected to the output end of door 107 and an enabling signal source V3
Two inputs, and the output end of OR gate 106 is then connected to another input with door 104.
Above-mentioned current stabilization drive device, secondary current detection unit 260 have a comparator 124, its reverse input end coupling
An assists winding (such as different name end) for being used to monitor secondary side current zero crossing of flyback transformer (224) is closed, it is just
The second reference voltage V4 is connected to input；The output end of comparator 124 produces the second tunnel control signal and exported to driving
Pulses generation module 240, and comparator 124 output end synchronized links into secondary current detection unit 260 square wave
In the input and secondary current detection unit 260 of oscillator 125 one with an input of door 127, square-wave oscillator 125
The oscillator signal of output is transferred to another input with door 127 by a phase inverter 126 in secondary current detection unit 260
End, first via control signal is produced with the output end of door 127.
Above-mentioned current stabilization drive device, in first group of charging and discharging circuit of saw-toothed wave generator 250, including：One
First charging current unit I1；One electric capacity C6 being connected in series with the first charging current unit I1, and in the first charging current
A switch SW1 is provided between unit I1 and electric capacity C6；One the first discharge current unit I4 being connected in parallel with electric capacity C6,
And a switch SW2 is provided between the switching node M and the first discharge current unit I4 between electric capacity C6 and switch SW1；
One comparator 118, its reverse input end are connected at the switching node M between electric capacity C6 and switch SW1, its positive input
The second reference voltage V4 is connected to, the output end of comparator 118 is connected to one of a nor gate 120 in first group of charging and discharging circuit
Individual input, another input of nor gate 120 receive first via pulse signal；Wherein, the output signal of nor gate 120 passes
Give a driver 119 in first group of charging and discharging circuit, and by the driving switch SW2 of driver 119 switch switching state,
A driver 115 receives first via pulse signal and driving switch SW1 switch switching state in one group of charging and discharging circuit, opens
SW2 is switched when closing SW1 closures to disconnect, switching SW1 when switching SW2 closures disconnects, to allow electric capacity C6 to implement discharge and recharge and in electricity
Hold and produce sawtooth waveforms at the switching node M between C6 and switch SW1.
Above-mentioned current stabilization drive device, in second group of charging and discharging circuit of saw-toothed wave generator 250, including：One
Second charging current unit I2；One electric capacity C5 being connected in series with the second charging current unit I2, and in the second charging current
A switch SW3 is provided between unit I2 and electric capacity C5；One the second discharge current unit I3 being connected in parallel with electric capacity C5,
And a switch SW4 is provided between the switching node N and the second discharge current unit I3 between electric capacity C5 and switch SW3；
One output signal for receiving the second road pulse signal and comparator 118 respectively corresponding with two inputs of door 116, with door
116 output end is connected to the input of a driver 117 of second group of charging and discharging circuit, is opened by the driving of driver 117
Close SW3 switch switching state；One input of one and door 122 receives anti-phase by one of second group of charging and discharging circuit
The inversion signal for the 4th road pulse signal that device 121 provides, another input receives the 3rd road pulse signal, with door 122
Output end is connected to the input of a driver 123 of second group of charging and discharging circuit, passes through the driving switch SW4 of driver 123
Switch switching state；Wherein, switch SW4 when switching SW3 closures to disconnect, switching SW3 when switching SW4 closures disconnects, to allow
Electric capacity C5 implement discharge and recharge and electric capacity C5 and switch SW3 between switching node N place generation sawtooth waveforms.
Brief description of the drawings
Read it is described further below and with reference to the following drawings after, feature and advantage of the invention will be evident：
Figure 1A is that the present invention relates to the schematic diagram of LED constant current output.
Figure 1B is the drive circuit based on Figure 1A and the unlatching to flyback transformer primary current and a secondary current, shut-off
Period implements the oscillogram by control.
Fig. 2A~2B is the detailed driving circuit structure of isolated form anti exciting converter of the present invention.
Fig. 3 is the schematic diagram that secondary side current transition state is judged using assists winding.
Fig. 4 is to choose the voltage or current waveform schematic diagram that some sampled points capture in isolated form anti exciting converter.
Embodiment
In figure ia, conventional civil power namely grid ac voltage Vac, the rectified action by a bridge rectifier are defeated
Go out a DC input voitage Vin, and electricity is inputted using DC input voitage Vin as the primary side of isolated form anti exciting converter
Pressure.In isolated form anti exciting converter, set one by pulse width modulating signal PWM control switch SW0 shut-off and
Switched between closure, switch SW0 is used for the disconnection and conducting for controlling transformer T primary side windings.Work as DC input voitage
After Vin inputs to transformer T, transformer T primary side output obtains the defeated of output end after a diode rectification
Go out voltage Vout, and an output capacitance is additionally provided with to maintain output voltage Vout to exist between output and ground GND
The state of relative constancy, output voltage Vout provide load output for load (such as LED light emitting diodes of the concatenation of diagram)
Electric current Iout.
In the present invention, it is inconvenient or inclined in order to avoid understanding the content of the invention caused by technical term to greatest extent
Difference a, it is believed that primary side of transformer and a primary side can also be characterized or replaced with a primary side and a secondary respectively
Generation.
In figure ia, the umber of turn of transformer T primary side and both primary sides ratio may be set to Np: Ns, except this it
Outside, the fixed inductance value Lp of the also predeterminable primary side and inductance value Ls of primary side, disclosed according to Figure 1A~1B, primary side current
Ip has primary side current peak I p_peak, and corresponding secondary side current Is then has respective secondary side current peak Is_
peak.So that transformer T is in a switch periods as an example, primary side has ON time T1 (while primary side shut-off), then
Primary side is closed, then and then its primary side begins to turn on and has ON time T2, and subsequent primary side turn-off time T3 is (primary
Side also turns off simultaneously), circulate next cycle in the same way again thereafter.In the time Ts=T1+ of complete a cycle
In T2+T3, primary side turn-on time T1 and close T2+T3 period, after secondary side closure T1 period open T2 when
Between section then again close T3 period.Wherein, the DC input voitage Vin of primary side current and transformer, inductance Lp meet
Following functional relation：
Default inductance Lp is definite value, if it is definite value further to set a certain switch time t, can learn ip (t) direct ratios
In DC input voitage Vin, in this case, substantially can be whole anti exciting converter system obtain preferable power because
Sub- power factor provide facility.And for primary side and the respective peak point current of primary side, and flow through the poles of LED bis-
The load output current Iout of pipe load, has following relation between them：
A spirit under this invention, currently assumes and makes T2=K × (T1+T3), and set K be a constant or
Steady state value (as demonstration but is not construed as limiting, such as K can be positive integer etc.), then can further be obtained：
Secondary side current peak I s_peak is substituted into above formula, and assumes that K values are 1, then has functional relation：
Learned from above formula, artificially select the ratio between Np: Ns it is constant have no hell and high water, thereby realized from the primary side of transformer
Constant current (Iout) is exported, flows through load LED output current Iout, and desired average output current can obtain
Substantially invariable electric current output.In a switch periods, in the situation of the ON time of fixed switching transistor (switch SW0)
Under, than do not clamp down on and fix switch SW0 ON time T1 situation, be greatly improved and improve power factor, obtain compared with
High power factor Power Factor.In the industry cycle, LED output light and wavelength are closely related with the temperature and electric current of PN junction,
The shortcomings of constant current effect that conventional drive circuit is maintained is poor, and temperature drift characteristic is poor, and input voltage range is narrow, will draw
Play LED premature aging, the characteristics of can not effectively extending LED life.And research foregoing in the present invention can change being somebody's turn to do for circuit
The shortcomings of, reach high efficiency, low cost, also veritably realize constant current effect, meet actual industrial production.
Fig. 2A~2B describes the control system for one primary side switch transistor M1 of switching control in more detail, with
The phase wing realizes our desired constant current effects, requires emphasis only yes, Fig. 2A and Fig. 2 B are substantially an overall sexual isolation
Type anti exciting converter is as current stabilization drive device, it is contemplated that the problem of individual sheets length, and based on detailed displaying circuit diagram
Purpose, specially split into two width figures.Fig. 2A~2B disclosed embodiment will be described in detail in subsequent content.
As demonstration but it is unrestricted, typical CLC types EMI filter circuit 220 include a filter inductance L1 and two filter
Ripple electric capacity C1 and C2, electric capacity C1 termination inductance L1 input, electric capacity C2 termination inductance L1 output end, electric capacity C1
Linked together with the respective other ends of C2 and be coupled to an input of bridge rectifier 222, inductance L1 output end
Then it is coupled to another input of bridge rectifier 222.
AC mains V1 inputs to EMI filter circuit 220, after EMI filter circuit 220 carries out EMI filtering, EMI filters
The output of wave circuit 220 is supplied to bridge rectifier 222 to carry out full-wave rectification, obtains DC input voitage Vin, input voltage
For Vin again after such as power frequency electrolytic capacitor filter carries out power frequency filtering, generation one has the straight of certain small voltage ripple
Voltage is flowed, inputing power is provided for flyback transformer 224.Specifically, the output end of bridge rectifier 222 produces flyback
The input voltage vin of converter, the output end of bridge rectifier 222 are coupled to electric capacity C3 one end, the electric capacity C3 other end
Such as negative pole is connected to earth terminal, input voltage vin is conveyed to the first of flyback transformer 224 again after electric capacity C3 is filtered and produced voltage stabilizing
One end (such as Same Name of Ends) of level side winding.In isolated form anti exciting converter, such as a switching transistor M1 (N-type
MOSFET drain electrode) is connected to the other end (such as different name end) of the primary side winding of flyback transformer 224, switching transistor M1's
A resistance R1 is connected between source electrode and earth terminal.
In isolated form anti exciting converter, there is a flyback transformer 224, the primary side winding of flyback transformer 224
One end (such as Same Name of Ends) be connected to earth terminal, and the primary side winding other end (such as different name end) is existed by a commutation diode D1
The output end node D of anti exciting converterN1Place output one output voltage Vout, as commutation diode D1 cathode terminal at can conduct
Output end, and in output end node DN1A filter capacitor C4 is connected between earth terminal.Export end node DN1It is caused
Output voltage Vout produces relative with small voltage ripple after electric capacity C4 filtering in the unearthed one end of electric capacity C4
Steady dc voltage, as the VD provided to LED even loads.Furthermore it is also possible to select in output voltage
An inductance L2 is connected between Vout output end or the unearthed one end of electric capacity C4 and load, load is, for example, one of series connection
The LED light emitting diodes D2 of single or multiple concatenations.
In isolated form anti exciting converter, there is provided a primary side current sampling module or primary current sampling module
235, primary current sampling module 235 has a divider for carrying resistance R4 and resistance R5, and resistance R4 one end is connected to
The output end of bridge rectifier 222, a resistance R5 is connected between resistance the R4 other end and earth terminal.Resistance R4 and
The output voltage namely the input voltage vin of flyback transformer 224 that resistance R5 can generate to bridge rectifier 222 divide
Pressure, (i.e. input voltage vin is in sampling module 235 for the magnitude of voltage of the common coupling node of resistance R4, R5 between the two
One partial pressure, common node is used to provide the second partial pressure between two resistance (R4, R5)) it is input to primary current sampling mould
The inverting input of one comparator 102 of block 235.And the normal phase input end of comparator 102 is then connected to switching transistor M1
Source electrode and resistance R1 between switching node at, resistance R1 may be considered the primary side peak point current of flyback transformer 224
Or primary side peak point current sampling network, the switching node between switching transistor M1 source electrode and resistance R1 can detect flyback change
The peak point current of the primary side winding of depressor 224, and this peak point current then can be converted into peak value because flowing through resistance R1 by resistance R1
Voltage signal is conveyed to the normal phase input end of comparator 102, so the sampling to peak point current is the step of embodying, it is horizontal
Voltage change across sampling resistor R1 both ends is collected or captures and send to the normal phase input end of comparator 102.
In isolated form anti exciting converter, a primary side voltage detection unit or original edge voltage detection unit are additionally provided
230, original edge voltage detection unit 230 has a divider for carrying resistance R2 and resistance R3, and resistance R2 one end is connected to
The output end of bridge rectifier 222, a resistance R3, the resistance are connected between resistance the R2 other end and earth terminal GND
The output voltage namely the input voltage vin of flyback transformer 224 that R2 and resistance R3 can generate to bridge rectifier 222 are carried out
Partial pressure, (i.e. input voltage vin is in detection unit 230 for the magnitude of voltage of the common coupling node of resistance R2, R3 between the two
A partial pressure, common node is used to provide the first partial pressure between two resistance (R2, R3)) be input to original edge voltage inspection
The normal phase input end of a comparator 101 of unit 230 is surveyed, the reverse input end of comparator 101 is connected to a fixed base
Quasi- reference voltage V2 (the first reference voltage), therefore, the voltage detected at the tie point or switching node between resistance R2, R3
Value will be compared with reference voltage V2 by comparator 101.It is emphasized that in original edge voltage detection unit 230 by
Resistance R2, R3 form divider with primary current sampling module 235 by resistance R4, R5 divider formed to same
The partial pressure effect of voltage differs, because both resistance R2, R3 resistance proportionate relationship and both resistance R4, R5 resistance ratio
Relation simultaneously differs.
In isolated form anti exciting converter, in addition to a driving pulse generation module 240, for determining flyback transformer
The on off state of 224 primary side windings, adjusts dutycycle, and the first via pulse signal that driving pulse generation module 240 exports passes
Be defeated by a driver 103, by driver 103 come driving switch transistor M1 switched on and off between switching.Driving
The part-structure of pulses generation module 240 is embodied in Fig. 2A, and another part embodies in fig. 2b.
Driving pulse generation module 240 has a rest-set flip-flop 105 (the first rest-set flip-flop), driving pulse generation module
240 need to produce the first via pulse signal for controlling switch transistor M1 on off states, can be complete by rest-set flip-flop 105
Into.For primary current sampling module 235, mainly by a partial pressure value of the input voltage vin of the primary side of flyback transformer 224
After compared with the magnitude of voltage that sampling resistor R1 both ends capture, comparative result is exported to driving pulse generation module 240.Tool
Body step includes, sampling network resistance R1 collections or the primary side peak-current signal or primary side that flow through primary side winding that capture
Peak-current signal is provided to the positive input of comparator 102, input voltage vin caused by bridge rectifier 222
One partial pressure value (voltage at the common node of resistance R4, R5 between the two) is provided to the reverse input end of comparator 102, this
Both will be compared by comparator 102, because the reset that the output end of comparator 102 is connected to rest-set flip-flop 105 sets end R
Input port, so the R that the low and high level signal for the comparative result that comparator 102 exports also is fed to rest-set flip-flop 105 is defeated
Inbound port.
For original edge voltage detection unit 230, mainly by the input voltage of the primary side of flyback transformer 224 or primary side
After a Vin partial pressure value is compared with a first reference voltage V2, comparative result is exported and produces mould to driving pulse
Block 240.Specific steps include, and (R2, R3 are between the two for a partial pressure value of input voltage vin caused by bridge rectifier 222
Node at voltage) be supplied to the positive input of comparator 101, (first with reference to electricity by a fixed reference voltage value V2
Pressure) reverse input end of comparator 101 is provided to, after they are compared using comparator 101, because comparator 101
Output end be connected to that driving pulse generation module 240 included one and an input of gate 104, so will also compare
Comparative result compared with device 101 is conveyed to the input with gate 104, and should and the output end of gate 104 then directly connect
The set end S input ports of the rest-set flip-flop 105 (the first rest-set flip-flop) of driving pulse generation module 240 are connected to, so with patrolling
Collect the S input ports that the level signal that door 104 exports is fed to rest-set flip-flop 105.Take this, the Q output of rest-set flip-flop 105
First via pulse signal caused by mouthful passes to switching transistor M1 control terminal via a buffer or driver 103.
The input of driver 103 receives the first via pulse signal of the Q output output of rest-set flip-flop 105, the output of driver 103
End is then connected to switching transistor M1 grid, and driving switch transistor M1 switches between switching on and off.
Referring to Fig. 2 B, in driving pulse generation module 240, the of the Q output output of the rest-set flip-flop 105 in Fig. 2A
Pulse signal is also transmitted to oscillator 112 in addition to sending driver 103 to all the way, and the Q output is also in node as shown
Synchronized links are used for the input for producing the oscillator 112 of square wave into Fig. 2 B at A.Caused by driving pulse generation module 240
First via pulse signal is formed by the Q output of rest-set flip-flop 105, and first via pulse signal drives except control driver 103
Dynamic switching transistor M1 outside switching between switching on and off, also by first via pulse believed by the output wave of oscillation of oscillator 112
Number triggering produce.
The output end of the oscillator 112 of driving pulse generation module 240 is arranged to be connected respectively：One side
The input of wave oscillator 113, an input, the R input of rest-set flip-flop 108 with door 110.Oscillator 112 is touched by RS
Send out the Q ends output signals triggering of device 105 and produce vibration square wave, vibration square wave simultaneous transmission to oscillator 113, with door 110 and
Rest-set flip-flop 108.Furthermore, the output end of the oscillator 113 of driving pulse generation module 240 is then connected to driving pulse
The input of a phase inverter 109 in generation module 240, the output end of phase inverter 109 are connected to driving pulse generation module 240
In it is foregoing with another input of door 110.So the vibration square wave of oscillator 112 is transferred directly to one with door 110
Input, the vibration square wave of oscillator 113 are then transmitted further to another input with door 110 via phase inverter 109 after reverse.
Wherein, the output end with door 110 is then connected to the input of a square-wave oscillator 114 in driving pulse generation module 240, should
The output end of oscillator 114 is connected to the S of a rest-set flip-flop 108 (the second rest-set flip-flop) for driving pulse generation module 240
Input, and it is set to a rest-set flip-flop 111 being connected in driving pulse generation module 240 with the output end of door 110
The R input of (the 3rd rest-set flip-flop), the logically high low level signal one side trigger generator 114 exported with door 110 produce
Square wave is vibrated, is on the other hand conveyed to the reset terminal R input of rest-set flip-flop 111.In addition, the reset terminal R of rest-set flip-flop 108 is defeated
Inbound port directly receives the wave of oscillation caused by square-wave oscillator 112, and set end S input ports receive square-wave oscillator 114 and produced
The wave of oscillation, and Q output produce pulse signal.
In driving pulse generation module 240, also with a pulse width modulated comparator 128 and one and door 129, wherein
The normal phase input end of comparator 128 connects the reference voltage source V4 (the second reference voltage) of a pre-determined stability, and compares
The inverting input of device 128 then receives the sawtooth signal for producing and exporting from saw-toothed wave generator 250, comparator 128
Output end is connected to an input with door 129, when comparator 128 is by the sawtooth signal of reception and specific reference voltage
V4 relatively after, take this using comparative result as produced by driving pulse generation module 240 and output the 4th road pulse signal, the
Four road pulse signals are exported by the output end of comparator 128, while output it an input for giving door 129.With door 129
Another input then receive from the second tunnel of secondary current detection unit 260 or secondary side current detection unit control believe
Number, secondary current detection unit 260 can produce the first via, the second tunnel control signal, and this will be discussed in detail in subsequent content.
It is connected to the output end of door 129 at node C and belongs to one of driving pulse generation module 240 input with door 107
End, the Q output of rest-set flip-flop 108 (the second rest-set flip-flop) is then connected to another input of door 107 at node B.
In addition, in driving pulse generation module 240, in addition to an OR gate 106, corresponding point of two inputs of OR gate 106
It is not connected to：One output end for starting trigger element V3 of output end, driving pulse generation module 240 with door 107, pays attention to
Here it is so-called to start trigger element or actively trigger the logically high, low level of generation for enabling signal source V3.Further and
Speech, by the agency of crosses the output end of comparator 101 and is connected to an input with door 104 in foregoing description, and is situated between herein
The output end of the OR gate 106 to continue is connected to another input with door 104, thereby can be by with the output signal of door 104
The low and high level signal and the output level of the OR gate 106 that comparator 101 exports determine, the logic level exported with door 104
Signal is used for the S input states of set rest-set flip-flop 105.
In isolated form anti exciting converter, in addition to a secondary current detection unit 260 or secondary side current detection list
Member, secondary current detection unit 260 will produce first via control signal and the second tunnel control signal, export and produced to driving pulse
Raw module 240.Secondary current detection unit 260 has a comparator 124, the positive input connection reference of comparator 124
Voltage source V4 (the second reference voltage), the reference voltage source V4 voltage swing are substantially close to zero, such as voltage V4 values can
For the positive voltage more bigger than 0, for example 0.0001 volt.As the real-time monitoring secondary side current eustasy feelings of flyback transformer 224
The means of condition, the output end node D of primary side windingN1The current signal at place can be collected, capture and be converted into a voltage signal,
The voltage signal that the capture is sampled simultaneously is synchronously inputted to the reverse input end namely comparison node D of comparator 124N2Place, with
Reference voltage source V4 is compared.In the present invention, do not directly take out, detect secondary side rectifier diode D1 negative electrode end nodes DN1
The current signal at place, but the mode of indirect gain current signal at this is employed, as shown in Figure 3, flyback transformer 224 removes
Outside original primary side primary side winding, to be also additionally provided with an assists winding K (set-up mode of assists winding has more
Kind, schema is as just demonstration without being construed as limiting), assists winding K around to identical with primary side winding, such as termination of the same name
Ground and different name end draw a node DN3, node DN3It is connected to reverse input end (the node D of comparator 124N2).Work as flyback
When the primary side winding current of transformer 224 is changed into 0, assists winding K different name terminal voltage namely node DN3Place turns into negative voltage and (become
For less than 0), equivalent to commutation diode D1 negative electrode end nodes DN1When the electric current at place is reduced to 0, assists winding K different name end is low
After comparator 124 compares, comparator 124 exports logic-high signal for both current potential and reference voltage V4.In other words, pass through
The zero crossing of assists winding K voltage signals is detected, but the zero crossing of indirect detection transformer secondary inductive current, although node
DN2Node D is not directly coupled toN1, but can be from node DN2Capture secondary side gusset DN1The zero-crossing timing of electric current.
In secondary current detection unit 260, the output end of comparator 124 is correspondingly connected respectively to：Driving pulse produces
In module 240 with an input of door 129, the input of square-wave oscillator 125, an input with door 127.When comparing
The comparison node D of device 124N2After the voltage level at place and the second reference voltage V4 size, comparative result is exported to driving pulse
With an input of door 129 in generation module 240, and comparative result is exported to one to secondary current detection unit 260
With an input of door 127, and comparative result exported to an oscillator 125 of secondary current detection unit 260
Input.Believe it is worth noting that, comparator 124 exports to the comparative result in driving pulse generation module 240 with door 129
Number, while be also to export to control letter to the second tunnel of driving pulse generation module 240 caused by secondary current detection unit 260
Number.The output end of comparator 124 is directly connected to an input of door 127 from having been able to learn above, at the same time,
The output end of oscillator 125 is connected to the input of a phase inverter 126 of secondary current detection unit 260, and phase inverter 126
Output end be then connected to another input with door 127, so the nationality of oscillator 125 by the comparative result of comparator 124 and
Output wave of oscillation signal caused by triggering is by phase inverter 126 is anti-phase and then output gives another input of door 127.
Controlled respectively by the output signal of comparator 124 and phase inverter 126 so as to corresponding with two inputs of door 127, with door 127
Output end is then connected to the set S inputs of rest-set flip-flop 111 in driving pulse generation module 240 (the 3rd rest-set flip-flop), institute
With with door 127 caused by high low logic level export S inputs to rest-set flip-flop 111, to set the output of rest-set flip-flop 111
Set logic state.It is emphasized that the output signal to rest-set flip-flop 111 is exported with the output end of door 127, as secondary electricity
The first via control signal to driving pulse generation module 240 is exported caused by stream detection unit 260.
In driving pulse generation module 240, the set S inputs of rest-set flip-flop 111 difference corresponding with R output ends are resetted
Controlled by the logic state exported with door 127,110, one of rest-set flip-flop 111Output end (inverse output terminal) produces
Second road pulse signal and a Q output (in-phase output end) produce the 3rd road pulse signal, and both is anti-phase each other
's.The drive signal that second road pulse signal and the 3rd road pulse signal export as driving pulse generation module 240, will be transmitted
The saw-toothed wave generator 250 given, will hereinafter be discussed in detail.
Referring to Fig. 2 B, in isolated form anti exciting converter, in addition to a sawtooth wave oscillation circuit or sawtooth waveforms occur
Device 250.And saw-toothed wave generator 250 then has first group of charging and discharging circuit and second group of charging and discharging circuit, wherein
First group of charging and discharging circuit is substantially a feedback inner ring of saw-toothed wave generator 250, and second group of charging and discharging circuit is
External circuit/module such as driving pulse generation module 240 provides sawtooth signal.
In first group of charging and discharging circuit of saw-toothed wave generator 250, the first via of the transmission of driving pulse generation module 240
Pulse signal will drive first group of charging and discharging circuit to produce sawtooth waveforms or triangular wave.First group of charging and discharging circuit has a charging
Current unit I1 (a first charging current unit) and electric capacity C6 and a switch SW1 (first switch), in charging current list
Be connected between first I1 and electric capacity C6 one switch SW1, switch SW1 and electric capacity C6 be connected on connection charging current unit I1 and
Between earth terminal GND, and it is parallel with electric capacity C6 a discharge current unit I4 of first group of charging and discharging circuit (first puts
Electric current unit).Detailed circuit structure can be described as：A switch is connected between charging current unit I1 and electric capacity C6
SW1 (such as mos transistor switch), electric capacity C6 one end connecting valve SW1, electric capacity C6 are not attached to switch the relatively another of SW1
One end is connected to earth terminal, is also associated between the common node M and discharge current unit I4 between electric capacity C6 and switch SW1 another
One switch SW2 (second switch), equivalent to switch SW2 and discharge current unit I4 in advance series connection after, both again with electric capacity
C6 is in parallel.Wherein, discharge current unit I4 also has earth terminal so as to discharge electric capacity C6 storages in addition to connecting valve SW2
Electric charge to ground.The unearthed one end of electric capacity C6 is that the first sawtooth waveforms can be produced at M nodes.
First group of charging and discharging circuit also has a comparator 118, and the positive input of comparator 118 is connected to benchmark ginseng
Voltage V4 (the second reference voltage) is examined, the reverse input end of comparator 118 is connected to the unearthed one end of electric capacity C6, namely connection
To at the common coupling node M of electric capacity C6 and switch SW1 between the two, therefore (the first sawtooth of sawtooth waveforms caused by node M
Ripple) negative-feedback signal is used as compared with reference voltage V4, because the output end of comparator 118 is connected to first group of discharge and recharge
One input of one nor gate 120 in loop, so the comparative result namely comparison control signal of comparator 118 will be defeated
Go out the input to nor gate 120.Meanwhile another input of nor gate 120 is connected to driving pulse production at node A
The Q output of rest-set flip-flop 105 (the first rest-set flip-flop) in raw module 240, and receive the Q output from rest-set flip-flop 105
The first via pulse signal of output.The output end of nor gate 120 is connected in first group of charging and discharging circuit driver 119
Input, and the output end of driver 119 is then connected to switch SW2 control terminal, therefore, is receiving driving pulse generation module
After the first via pulse signals of 240 outputs and the comparative result of comparator 118, the output result of nor gate 120 send to for
Driving switch SW2 driver 119, driver 119 are being switched on or switched off according to the instruction of nor gate 120 come driving switch SW2
Between switch.
In first group of charging and discharging circuit, except driver 119 is used to controlling and driving such as transistor switch SW2 (the
Two switch) on off state switching.First group of charging and discharging circuit also has another driver 115, for controlling and driving example
On off state such as transistor switch SW1 (first switch) switches.Referring to Fig. 2A~2B, the input of driver 115 is also saving
The Q output of rest-set flip-flop 105 namely its positive output end in driving pulse generation module 240 are coupling-connected at point A, is driven
The output end of device 115 is then connected to switch SW1 control terminal, so as to the first via arteries and veins for exporting the Q output of rest-set flip-flop 105
Rush signal and be transferred to driver 115, driver 115 exists according to the logical signal of rest-set flip-flop 105 by order-driven switch SW1
Switch between being switched on or switched off.
In first group of charging and discharging circuit, both switch SW1, SW2 must meet certain sequence switch state：One of which
Another one disconnects during connection.Under the control of first via pulse signal, preset switches SW1 is closed first, charging current unit I1
To be that electric capacity C6 be charged, but in the charge step, nationality by reception first via pulse signal nor gate 120 effect
Under, controlling switch SW2 disconnects.After electric capacity C6 is fully charged, the logic state of first via pulse signal is overturn, driver
115 are closed according to the instruction controlling switch SW2 of first via pulse signal, but driver 119 can be controlled synchronously according to the instruction of nor gate 120
System switch SW1 disconnects, and is discharged into ground from the switch SW2 of connection and via discharge current unit I4 so as to electric capacity C6 electric charge.Cause
This, switch both SW1, SW2 switch mutually between connecting and disconnecting relative to each other, the circulation to go round and begin again, then electric capacity C6
At switching node M between unearthed one end namely electric capacity C6 and switch SW1, the sawtooth waveforms (first of variation in voltage can be produced
Sawtooth waveforms).
In second group of charging and discharging circuit of saw-toothed wave generator 250, second group of charging and discharging circuit includes a charging electricity
Unit I2 (the second charging current unit) and an electric capacity C5 and a switch SW3 (the 3rd switch) are flowed, in charging current list
Switch a SW3, electric capacity C5 are connected between first I2 and electric capacity C5 and switch SW3 is connected in series in charging current unit I2 and connect
Between ground terminal GND, and it is parallel with electric capacity C5 a discharge current unit I3 (the second electric discharges of second group of charging and discharging circuit
Current unit).Detailed circuit structure can be described as：A switch is connected between charging current unit I2 and electric capacity C5
SW3 (such as mos transistor switch), electric capacity C5 one end connecting valve SW3, electric capacity C5 are not attached to switch the relatively another of SW1
One end is connected to earth terminal, is also associated between the common node N and discharge current unit I3 between electric capacity C5 and switch SW3 another
One switch SW4 (the 4th switch), after switch SW4 and discharge current unit I3 in advance series connection, both again with electric capacity
C6 is in parallel.Wherein, discharge current unit I3 (the second discharge current unit) in addition to connecting valve SW4 also have earth terminal so as to
The electric charge of electric capacity C5 storages can be discharged.The unearthed one end of electric capacity C5 is the sawtooth waveforms (that variation in voltage can be produced at N nodes
Two sawtooth waveforms).
Second group of charging and discharging circuit will receive the second road pulse signal, the 3rd tunnel that driving pulse generation module 240 exports
With the 4th road pulse signal, and the comparison control signal of first group of charging and discharging circuit output is received, so as to drive second group of charge and discharge
Electrical circuit produces sawtooth waveforms or triangular wave.The output end of one driver 117 of second group of charging and discharging circuit is connected to switch SW3
Control terminal, driver 117 is used for the switch shape for the switch SW3 (the 3rd switch) for controlling and driving such as MOS transistor integrated
State.One of second group of charging and discharging circuit and an input of door 116 are connected to comparator 118 in first group of charging and discharging circuit
Output end, should and another input of door 116 then be connected to rest-set flip-flop 111 the (the 3rd in driving pulse generation module 240
Rest-set flip-flop)Output end (inverse output terminal), received equivalent to door 116 from driving pulse generation module 240 by RS
Trigger 111The second road pulse signal that output end is sent, and receive the comparative result that comparator 118 exports and compare control
Signal processed, to produce logic output.After nationality with the output end of door 116 by being connected to the input of driver 117, driver
117, according to the instruction exported with door 116, carry out driving switch SW3 and switch between being switched on or switched off.
Second group of charging and discharging circuit also includes a driver 123, and the output end of driver 123 is connected to switch SW4's
Control terminal, for controlling and driving the on off state of the integrated switch SW4 of such as MOS transistor (the 4th switch).Second group is filled
The Q that one input of one of discharge loop and door 122 is connected to rest-set flip-flop 111 in driving pulse generation module 240 is defeated
Go out end (positive output end), a phase inverter 121 of second group of charging and discharging circuit is then connected to another input of door 122
Output end, the input of phase inverter 121 is then connected to the output end of comparator 128 in driving pulse generation module 240.For
For door 122, it is connected to a port of the Q output of rest-set flip-flop 111, receives the Q output production of rest-set flip-flop 111
The 3rd raw road pulse signal, it is connected to another port of the output end of phase inverter 121, then receives caused by comparator 128
The rp pulse signal of 4th road pulse signal (nationality is anti-phase by phase inverter 121).So as to which the output end with door 122 is connected to driving
After the input of device 123, the instruction that driver 123 transmits according to door 122 is come driving switch SW4 between being switched on or switched off
Switching.In second group of charging and discharging circuit, the connection section between the unearthed one end of electric capacity C5, namely electric capacity C5 and switch SW3
At point N, sawtooth waveforms (the second sawtooth waveforms) or triangular wave will be produced, and send comparator 128 in driving pulse generation module 240 to
Reverse input end, comparator 128 compared with reference voltage V4 (the second reference voltage), compares sawtooth signal
As a result namely the 4th road output of pulse signal caused by driving pulse generation module 240 is to the anti-phase of second group of charging and discharging circuit
Device 121, phase inverter 121 receive the result after perform it is anti-phase and export give door 122, the 4th road pulse signal is synchronously also transmitted to
With an input of door 129.
In second group of charging and discharging circuit, both switch SW3, SW4 must meet certain sequence switch state：One of which
Another one disconnects during connection.Under the control of the second road pulse signal and comparison control signal, preset switches SW3 is closed first,
Charging current unit I2 will be that electric capacity C5 is charged, in the charge step, the 3rd road pulse signal and the second tunnel pulse letter
Inversion signal, the 3rd road pulse signal are the equal of the signal that the logic state of the second road pulse signal is overturn number each other,
So under the control of the 3rd road pulse signal, switch SW4 is to disconnect, so charging current unit I2 can be electric capacity easily
C5 charges.After electric capacity C5 is fully charged, the second tunnel, the 3rd road pulse signal logic state are all synchronously overturn, the 4th tunnel
The rp pulse signal and the 3rd road pulse signal of pulse signal will controlling switch SW4 closures, but the second road pulse signal is also
Synchronous control switch SW3 disconnects, to complete the switch SW4 and discharge current list that the electric capacity C5 of charging electric charge can be through the turned on
First I3 is discharged into ground.Consequently, it is possible within the cycle so repeated, both switch SW3, SW4 are each other in connecting and disconnecting
Between switch, the circulation to go round and begin again, so as to electric capacity C5 unearthed one end namely electric capacity C5 and switch SW3 between coupling
At node N, the sawtooth waveforms (the second sawtooth waveforms) of variation in voltage can be produced, this sawtooth waveforms is the whole table of saw-toothed wave generator 250
Reveal the output signal come, such as be defeated by the reverse input end of the comparator 128 of driving pulse generation module 240.
In certain embodiments, charging current unit I1, I2 (first, second charging current unit) may be coupled to be grounded
End.At this using isolated form anti exciting converter as in current stabilization drive device, original edge voltage detection unit 230 is by flyback transformer
After one partial pressure of the input voltage vin of 224 primary sides is compared with a first reference voltage V2, by comparative result export to
Driving pulse generation module 240.Primary current sampling module 235 is by one of the input voltage vin of the primary side of flyback transformer 224
After partial pressure is compared with the voltage that the sampling resistor R1 both ends of primary side winding capture, comparative result is exported to driving pulse
Generation module 240.Secondary current detection unit 260 is by the vice-side winding of flyback transformer 224 or primary side winding via rectification two
After the output voltage Vout of pole pipe D1 outputs is compared with the second reference voltage V4, first via control signal, the second tunnel are produced
Control signal, and export to driving pulse generation module 240.The nationality of driving pulse generation module 240 produces by rest-set flip-flop 105
Pulse signal, nationality are produced by the road pulse signal of rest-set flip-flop 111 second and the 3rd road pulse signal, nationality by comparator 128 all the way
4th road pulse signal, saw-toothed wave generator 250 receive the first via transmitted from driving pulse generation module 240, the second tunnel
Pulse signal and the 3rd tunnel, the 4th road pulse signal, and sawtooth waveforms is exported to driving pulse generation module 240.Driving pulse produces
Caused first via pulse signal is used to drive the switching transistor M1 being serially connected on primary side winding connecing by raw module 240
Switching state between through and off are opened.
In Fig. 4, oscillogram of the curtage at several nodes relative to the time is illustrated.Wherein I (Dled) is
Flow through LED electric current.Vdetect is the detection voltage of resistance R4, R5 between the two in divider, and is exported to comparator
The voltage of 102 reverse input ends, Vrs are the magnitudes of voltage that resistance R1 both ends gather in primary side peak point current sampling network, and defeated
Go out the voltage to the positive input of comparator 102.Fig. 4 also illustrates a secondary current Isec or primary side winding current and offer
Change waveform to LED voltage VLED.
More than, by explanation and accompanying drawing, give the exemplary embodiments of the specific structure of embodiment, foregoing invention
Existing preferred embodiment is proposed, but these contents are not intended as limiting to.For a person skilled in the art, in reading
State it is bright after, various changes and modifications undoubtedly will be evident.Therefore, appended claims, which should be regarded as, covers the present invention
True intention and scope whole variations and modifications.In Claims scope any and all scope of equal value with it is interior
Hold, be all considered as still belonging to the intent and scope of the invention.
Claims (5)
- A kind of 1. current stabilization drive device, it is characterised in that including：One is connected in series in the switching transistor (M1) in a flyback transformer (224) primary side winding；One original edge voltage detection unit (230), by one first partial pressure of the input voltage (Vin) of flyback transformer (224) primary side After compared with one first reference voltage (V2), comparative result is exported to a driving pulse generation module (240)；One primary current sampling module (235), have a sampling resistor (R1) be connected on switching transistor (M1) and earth terminal it Between, by one second partial pressure of the input voltage (Vin) of flyback transformer (224) primary side and the electricity of sampling resistor (R1) both ends acquisition After pressure is compared, comparative result is exported and gives driving pulse generation module (240)；One saw-toothed wave generator (250) receives the first via from driving pulse generation module (240) transmission, the second tunnel pulse letter Number and the 3rd tunnel, the 4th road pulse signal, and export sawtooth waveforms to driving pulse generation module (240)；One secondary current detection unit (260), by the output voltage (Vout) and the of flyback transformer (224) vice-side winding output After two reference voltages (V4) are compared, produce the first via, the second tunnel control signal and export and give driving pulse generation module (240)；Caused first via pulse signal is used for driving switch transistor (M1) by the driving pulse generation module (240) Switch switching state；Switching transistor (M1) ON time (T1) is wherein fixed in a switch periods to improve power factor, and nationality by The ratio between time (T2) and switch periods time (Ts) that default flyback transformer (224) vice-side winding is connected come real for a steady state value Existing constant current output；In driving pulse generation module (240), including：One first rest-set flip-flop (105), the comparative result of primary current sampling module (235) output are transferred to the first rest-set flip-flop (105) R input, the S inputs of the first rest-set flip-flop (105) are connected in driving pulse generation module (240) one and door (104) output end, and should be received with an input of door (104) from original edge voltage detection unit (230) output Comparative result, a Q output of the first rest-set flip-flop (105) produce first via pulse signal；One second rest-set flip-flop (108), a square wave oscillation of the first via pulse signal transmission to driving pulse generation module (240) After the input of device (112), oscillator signal caused by square-wave oscillator (112) triggering gives the 2nd RS from its output end synchronous driving The R input of trigger (108), the one of driving pulse generation module (240) produce with an input of door (110), driving pulse The input of a square-wave oscillator (113) for raw module (240), and the oscillator signal of square-wave oscillator (113) output passes through A phase inverter (109) for driving pulse generation module (240) sends another input with door (110) to, with door (110) After output end is connected to the input of a square-wave oscillator (114) of driving pulse generation module (240), square-wave oscillator (114) oscillator signal caused by triggering sends the S inputs of the second rest-set flip-flop (108) to from its output end；One the 3rd rest-set flip-flop (111), the R input of the 3rd rest-set flip-flop (111) is connected to the output end of door (110), and The S inputs of 3rd rest-set flip-flop (111) receive the first via control signal of secondary current detection unit (260) output, and One Q output of the 3rd rest-set flip-flop (111) produces the 3rd road pulse signal and a Q output produces the second tunnel pulse letter Number；One pulse width modulated comparator (128), its reverse input end receive the sawtooth waveforms from saw-toothed wave generator (250) output, Its positive input is connected to the second reference voltage (V4), and is produced in output end and send the of saw-toothed wave generator (250) to Four road pulse signals；Wherein, the second tunnel control signal of secondary current detection unit (260) output, which exports, gives driving pulse generation module (240) One with an input of door (129), be connected to pulse width modulated comparator (128) with another input of door (129) Output end, output end, a Q output of the second rest-set flip-flop (108) with door (129) are connected respectively to driving pulse and produce mould The one of block (240) with two inputs of door (107), and be connected with the output end of door (107) and an enabling signal source (V3) To two inputs of an OR gate (106) for driving pulse generation module (240), and the output end of OR gate (106) is then connected to With another input of door (104)；Secondary current detection unit (260) has a comparator (124), and its reverse input end is coupled to flyback transformer (224) one is used for the assists winding for monitoring secondary side current zero crossing, and its positive input is connected to the second reference voltage (V4)；The output end of comparator (124), which produces the second tunnel control signal and exported, gives driving pulse generation module (240), and ratio Compared with device (124) output end synchronized links into secondary current detection unit (260) input of a square-wave oscillator (125) and One leads to an input of door 127, the oscillator signal of square-wave oscillator (125) output in secondary current detection unit (260) Cross a phase inverter (126) in secondary current detection unit (260) be transferred to another input of door (127), with door (127) Output end produces first via control signal.
- 2. current stabilization drive device as claimed in claim 1, it is characterised in that original edge voltage detection unit (230) includes one Comparator (101) and the divider being made up of two resistance (R2, R3), resistance (R2, R3) are connected in series in flyback transformer (224) between the input and earth terminal of primary side winding, the positive input of comparator (101) be connected to two resistance (R2, R3 common node between), common node is used to providing the first partial pressure between two resistance (R2, R3), comparator (101) it is anti- A fixed reference voltage (V2) is connected to input, the comparative result of comparator (101) exports to be produced to driving pulse Module (240).
- 3. current stabilization drive device as claimed in claim 1, it is characterised in that primary current sampling module (235) includes one Comparator (102) and the divider being made up of two resistance (R4, R5), resistance (R4, R5) are connected in series in flyback transformer (224) between the input and earth terminal of primary side winding, the positive input of comparator (102) be connected to sampling resistor (R1) and Node between switching transistor (M1), the reverse input end of comparator (102) are connected to public affairs between two resistance (R4, R5) Conode, common node is used to provide the second partial pressure between two resistance (R4, R5), and the comparative result of comparator (102) is defeated Go out and give driving pulse generation module (240).
- 4. current stabilization drive device as claimed in claim 1, it is characterised in that at one first group of saw-toothed wave generator (250) In charging and discharging circuit, including：One first charging current unit (I1)；One and first electric capacity (C6) that is connected in series of charging current unit (I1), and in the first charging current unit (I1) and electric capacity (C6) switch (SW1) is provided between；One the first discharge current unit (I4) being connected in parallel with electric capacity (C6), and between electric capacity (C6) and switch (SW1) A switch (SW2) is provided between switching node (M) and the first discharge current unit (I4)；One comparator (118), its reverse input end are connected to electric capacity (C6) and switch switching node (M) place between (SW1), its Positive input is connected to the second reference voltage (V4), and the output end of comparator (118) is connected in first group of charging and discharging circuit One input of one nor gate (120), another input of nor gate (120) receive first via pulse signal；Wherein, the output signal of nor gate (120) sends a driver (119) in first group of charging and discharging circuit to, and by driving The switch switching state of device (119) driving switch (SW2), a driver (115) receives the first via in first group of charging and discharging circuit The switch switching state of pulse signal and driving switch (SW1), (SW2) is switched when switch (SW1) closes and is disconnected, is switched (SW2) Switch (SW1) during closure to disconnect, to allow electric capacity (C6) to implement discharge and recharge and the coupling between electric capacity (C6) and switch (SW1) Node (M) place produces sawtooth waveforms.
- 5. current stabilization drive device as claimed in claim 1, it is characterised in that at one second group of saw-toothed wave generator (250) In charging and discharging circuit, including：One second charging current unit (I2)；One and second electric capacity (C5) that is connected in series of charging current unit (I2), and in the second charging current unit (I2) and electric capacity (C5) switch (SW3) is provided between；One the second discharge current unit (I3) being connected in parallel with electric capacity (C5), and between electric capacity (C5) and switch (SW3) A switch (SW4) is provided between switching node (N) and the second discharge current unit (I3)；One receives the output signal of the second road pulse signal and comparator (118) with two inputs of door (116) respectively, with door (116) output end is connected to the input of a driver (117) of second group of charging and discharging circuit, passes through driver (117) The switch switching state of driving switch (SW3)；One receives the provided by a phase inverter (121) for second group of charging and discharging circuit the 4th with an input of door (122) The inversion signal of road pulse signal, another input receive the 3rd road pulse signal, and the is connected to the output end of door (122) The input of one driver (123) of two groups of charging and discharging circuits, is cut by the switch of driver (123) driving switch (SW4) Change state；Wherein, switch (SW4) when switching (SW3) closure to disconnect, switching (SW3) during switch (SW4) closure disconnects, to allow electric capacity (C5) implement discharge and recharge and switching node (N) place between electric capacity (C5) and switch (SW3) produces sawtooth waveforms.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410279299.9A CN105338681B (en) | 2014-06-20 | 2014-06-20 | Current stabilization drive device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410279299.9A CN105338681B (en) | 2014-06-20 | 2014-06-20 | Current stabilization drive device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105338681A CN105338681A (en) | 2016-02-17 |
| CN105338681B true CN105338681B (en) | 2018-03-02 |
Family
ID=55288846
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410279299.9A Active CN105338681B (en) | 2014-06-20 | 2014-06-20 | Current stabilization drive device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105338681B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110880877A (en) * | 2019-12-18 | 2020-03-13 | 杭州鸣扬科技有限公司 | Integrated isolation power supply circuit for communication type circuit breaker |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101951716A (en) * | 2010-09-30 | 2011-01-19 | 杭州电子科技大学 | Constant-on-time primary side constant-current control device for LED driver with high power factor |
| JP2011249145A (en) * | 2010-05-27 | 2011-12-08 | New Japan Radio Co Ltd | Led drive circuit |
| CN102368662A (en) * | 2011-03-10 | 2012-03-07 | 杭州士兰微电子股份有限公司 | Current reference generation circuit, constant current switch power supply control circuit and control method thereof |
| CN102931828A (en) * | 2012-08-31 | 2013-02-13 | 杭州士兰微电子股份有限公司 | Power factor correction circuit and method for improving power factor |
| CN203039585U (en) * | 2012-09-25 | 2013-07-03 | 西南交通大学 | Critical continuous mode unity power factor flyback converter |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012124581A (en) * | 2010-12-06 | 2012-06-28 | Toshiba Corp | Led driver circuit and led driver system |
-
2014
- 2014-06-20 CN CN201410279299.9A patent/CN105338681B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011249145A (en) * | 2010-05-27 | 2011-12-08 | New Japan Radio Co Ltd | Led drive circuit |
| CN101951716A (en) * | 2010-09-30 | 2011-01-19 | 杭州电子科技大学 | Constant-on-time primary side constant-current control device for LED driver with high power factor |
| CN102368662A (en) * | 2011-03-10 | 2012-03-07 | 杭州士兰微电子股份有限公司 | Current reference generation circuit, constant current switch power supply control circuit and control method thereof |
| CN102931828A (en) * | 2012-08-31 | 2013-02-13 | 杭州士兰微电子股份有限公司 | Power factor correction circuit and method for improving power factor |
| CN203039585U (en) * | 2012-09-25 | 2013-07-03 | 西南交通大学 | Critical continuous mode unity power factor flyback converter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105338681A (en) | 2016-02-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105207487B (en) | Control method and circuit of resonant converter and resonant converter | |
| CN105375768B (en) | Capacitive mode protection method and capacitive mode control circuit of resonant converter | |
| CN105684287B (en) | Grid driving device for resonance converter | |
| CN102946199B (en) | DC-isolation buck converter and busbar voltage testing circuit thereof | |
| CN102882377B (en) | Synchronous rectifying control method and circuit | |
| CN103812359B (en) | A kind of ac-dc conversion circuit and control method thereof | |
| CN108521115B (en) | A kind of primary controller and Switching Power Supply of Switching Power Supply | |
| CN102055344B (en) | Switch power supply | |
| CN102752940A (en) | High-efficiency LED (light-emitting diode) drive circuit and drive method thereof | |
| CN106341925B (en) | LED drive chip, can colour temperature adjust LED drive power system and LED lamp | |
| CN105939554B (en) | LED light modulating devices and LED drive power | |
| CN101103528A (en) | Triangle wave generating circuit, inverter using same, light emitting apparatus, and liquid crystal television receiver | |
| CN106604444A (en) | Voltage control device | |
| CN108199424A (en) | Multi-phase charging circuit and control method thereof | |
| CN104578722A (en) | Zero cross detection circuit of inductive current in power switch chip | |
| CN109802582A (en) | The circuit of synchronous rectification of wireless charging receiving terminal | |
| CN107742971A (en) | A kind of drive circuit and switching power circuit | |
| CN106793290B (en) | A kind of isolated multipath flows LED drive power | |
| CN206673569U (en) | The output protection circuit of Switching Power Supply | |
| CN207216474U (en) | A kind of current sample change-over circuit and LED constant current power supply | |
| CN105338681B (en) | Current stabilization drive device | |
| CN103916020B (en) | Switching Power Supply and control circuit thereof | |
| CN103236780A (en) | PWM (pulse-width modulation) module capable of alternatively generating interruption mode and critical mode in flyback topology | |
| CN106353953B (en) | Flash lamp module and flash generator mould group | |
| CN204858982U (en) | Three level LLC resonant transformation wares |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 401331 4th Floor, 367 Xiyong Road, Xiyong Town, Shapingba District, Chongqing Patentee after: Huarun Microelectronics (Chongqing) Co., Ltd. Address before: 401331 4th Floor, 367 Xiyong Road, Xiyong Town, Shapingba District, Chongqing Patentee before: China Aviation (Chongqing) Microelectronics Co., Ltd. |
|
| CP01 | Change in the name or title of a patent holder | ||
| CP02 | Change in the address of a patent holder |
Address after: 401331 No. 25 Xiyong Avenue, Shapingba District, Chongqing Patentee after: Huarun Microelectronics (Chongqing) Co., Ltd. Address before: 401331 4th Floor, 367 Xiyong Road, Xiyong Town, Shapingba District, Chongqing Patentee before: Huarun Microelectronics (Chongqing) Co., Ltd. |
|
| CP02 | Change in the address of a patent holder |