CN205546103U - Flyback drive circuit - Google Patents
Flyback drive circuit Download PDFInfo
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- CN205546103U CN205546103U CN201620352807.6U CN201620352807U CN205546103U CN 205546103 U CN205546103 U CN 205546103U CN 201620352807 U CN201620352807 U CN 201620352807U CN 205546103 U CN205546103 U CN 205546103U
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Abstract
The utility model provides a flyback drive circuit, the flyback power unit NOT AND of establishing ties through the output keep apart the DCDC converting unit common drive LED load, the rethread ripple acquire the unit acquire with flyback power unit's the feedback signal VFB that output ripple is relevant to input feedback signal VFB to electrical appliance industry the control unit, electrical appliance industry the control unit according to feedback signal VFB and with non - isolation DCDC converting unit's the sampled signal VS that output voltage V2 is relevant output control signal VC extremely non - isolation DCDC converting unit, control non - isolation DCDC converting unit's output voltage ripple with flyback power unit's output voltage ripple phase place is opposite, makes the ripple in the LED load reduce elimination even, avoids output current to have great ripple and causes the LED lamp stroboscopic phenomenon to appear.
Description
Technical field
This utility model relates to Flyback actuation techniques field, particularly relates to a kind of Flyback drive circuit.
Background technology
Single-stage Flyback topological circuit simple in construction of the prior art, its input voltage is in very large range
During fluctuation, still can there is more stable output；The most can realize exchange to input between 85-305V, reach
The requirement of stable output, so single-stage Flyback topological circuit is widely used in all kinds of Switching Power Supply, as
The driving power supply of LED.
But single-stage Flyback topological circuit, to realize PFC (Power Factor Correction, merit
Rate factor correcting) function, controlling loop needs the slowest response speed just can have higher PF (Power
Factor, power factor) value, therefore, it is relatively slow that it controls loop response speed, and this can cause output electricity
Stream has bigger ripple, and when driving power supply as LED, this current ripples will cause LED
Stroboscopic phenomenon occurs, and this stroboscopic phenomenon will affect the service life of LED human eye is also had certain
Damage.
Utility model content
In view of this, this utility model provides a kind of Flyback drive circuit, defeated to solve prior art
Go out electric current and there is bigger ripple and the problem that causes LED that stroboscopic phenomenon occurs.
To achieve these goals, the technical scheme that this utility model embodiment provides is as follows:
A kind of Flyback drive circuit, including:
Primary current control mode is used to obtain Flyback power cell and the non-isolated stably exporting electric current
DC/DC converter unit；Described Flyback power cell and described non-isolation DC/DC converter unit defeated
Go out end series connection, jointly drive LED load；
The ripple obtaining the feedback signal relevant to the output ripple of described Flyback power cell obtains single
Unit, described output ripple includes output current ripple or output voltage ripple；
Receive the sampled signal relevant to the output voltage of described non-isolation DC/DC converter unit, according to institute
State sampled signal and described feedback signal outputs control signals to described non-isolation DC/DC converter unit, control
Make the output ripple of described non-isolation DC/DC converter unit and the output wave of described Flyback power cell
The Voltage loop control unit of stricture of vagina opposite in phase.
Preferably, described ripple acquiring unit includes: block isolating circuit；The input of described block isolating circuit with
The outfan of described Flyback power cell is connected, the outfan of described block isolating circuit and described Voltage loop control
The input of unit processed is connected.
Preferably, described ripple acquiring unit includes: difference channel and block isolating circuit；Wherein:
Two inputs of described difference channel respectively with two outfans of described Flyback power cell
It is connected；
The outfan of described difference channel is connected with the input of described block isolating circuit；
The outfan of described block isolating circuit is connected with the input of described Voltage loop control unit.
Preferably, described Flyback power cell includes: primary side winding, the first vice-side winding, first whole
Flow module, the first switching tube and the first resistance；Wherein:
The outfan of described first vice-side winding is connected with the input of described first rectification module；
The outfan of described first rectification module is the outfan of described Flyback power cell；
The different name end of described primary side winding is an input of described Flyback power cell；
The Same Name of Ends of described primary side winding is by one end phase of described first switching tube with described first resistance
Even；
The other end of described first resistance is another input of described Flyback power cell；
The control end of described first switching tube receives and drives signal；
According to described driving signal, the primary current sampled signal of described Flyback power cell controls institute
State the signal of Flyback drive circuit current stabilization output.
Preferably, described Flyback power cell also includes: the second vice-side winding and the second rectification module；
The outfan of described second vice-side winding is connected with the input of described second rectification module；Described second whole
The outfan of flow module is connected with the input of described non-isolation DC/DC converter unit.
Preferably, described non-isolation DC/DC converter unit is buck circuit；Described non-isolation DC/DC
Converter unit includes: second switch pipe, the second diode and the first inductance；Wherein:
One end of described second switch pipe is an input of described non-isolation DC/DC converter unit；
The other end of described second switch pipe and the negative electrode and the one of described first inductance of described second diode
End is connected；
The anode of described second diode is another input of described non-isolation DC/DC converter unit；
The other end of described first inductance and the anode of described second diode are respectively described non-isolated
Two outfans of DC/DC converter unit.
Preferably, the described sampled signal that described Voltage loop control unit receives is from described non-isolation DC/DC
The outfan of converter unit obtains.
Preferably, described Voltage loop control unit also receives reference signal；
Or described Voltage loop control unit is built-in with default reference signal；
The magnitude of voltage of described reference signal is maximum more than or equal to the output voltage of described Flyback power cell
The half of the peak-to-peak value of ripple.
Preferably, described Voltage loop control unit includes: subtractor and the first integrated transporting discharging；Described subtraction
One input of device receives described reference signal, and another input of described subtractor receives described ripple
The described feedback signal of acquiring unit output；The outfan of described subtractor and described first integrated transporting discharging
One input is connected；Another input of described first integrated transporting discharging receives described sampled signal；
Or, described Voltage loop control unit includes: adder and the second integrated transporting discharging；Described adder
Input receive the described feedback signal of described ripple acquiring unit output；Described adder another
One input receives described sampled signal；The outfan of described adder and described second integrated transporting discharging
One input is connected；Another input of described second integrated transporting discharging receives described reference signal；
Described Voltage loop control unit is according to described reference signal, described feedback signal and described sampled signal
Output control signal.
Preferably, also include dimming control unit, the outfan output light modulation letter of described dimming control unit
Number to the former limit of described Flyback power cell.
The application provides a kind of Flyback drive circuit, stable including using primary current control mode to obtain
The Flyback power cell of output electric current and non-isolation DC/DC converter unit, described Flyback power
Unit drives LED load after connecting with the outfan of non-isolation DC/DC converter unit jointly, then passes through
Ripple acquiring unit obtains feedback signal VFB relevant to the output ripple of described Flyback power cell,
And feedback signal VFB is inputted to Voltage loop control unit, described Voltage loop control unit is according to feedback letter
Number VFB and relevant for output voltage V2 sampled signal VS to described non-isolation DC/DC converter unit
Output control signal VC, to described non-isolation DC/DC converter unit, controls described non-isolation DC/DC
The output voltage ripple of converter unit and the output voltage ripple opposite in phase of described Flyback power cell,
Make the ripple in LED load reduce even to eliminate, it is to avoid output electric current has bigger ripple and causes
There is stroboscopic phenomenon in LED.
Accompanying drawing explanation
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, below will
The accompanying drawing used required in embodiment or description of the prior art is briefly described, it should be apparent that,
Accompanying drawing in describing below is only embodiment of the present utility model, comes for those of ordinary skill in the art
Say, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to the accompanying drawing provided.
The structural representation of a kind of Flyback drive circuit that Fig. 1 provides for the embodiment of the present application；
A kind of signal waveform schematic diagram that Fig. 2 provides for another embodiment of the application；
The structural representation of a kind of Flyback drive circuit that Fig. 3 provides for another embodiment of the application；
The structural representation of another Flyback drive circuit that Fig. 4 provides for another embodiment of the application.
Detailed description of the invention
Below in conjunction with the accompanying drawing in this utility model embodiment, to the technology in this utility model embodiment
Scheme is clearly and completely described, it is clear that described embodiment is only this utility model one
Divide embodiment rather than whole embodiments.Based on the embodiment in this utility model, this area is common
The every other embodiment that technical staff is obtained under not making creative work premise, broadly falls into this
The scope of utility model protection.
This utility model provides a kind of Flyback drive circuit, has solving prior art output electric current
Bigger ripple and the problem that causes LED that stroboscopic phenomenon occurs.
Concrete, as it is shown in figure 1, described Flyback drive circuit, including: Flyback power cell
101, non-isolation DC/DC converter unit 102, ripple acquiring unit 103 and Voltage loop control unit 104；
Wherein:
The outfan series connection of Flyback power cell 101 and non-isolation DC/DC converter unit 102；
The input of ripple acquiring unit 103 is connected with the outfan of Flyback power cell 101；Ripple
The outfan of acquiring unit 103 is connected with the input of Voltage loop control unit 104；
The control end phase of the outfan of Voltage loop control unit 104 and non-isolation DC/DC converter unit 102
Even.
What deserves to be explained is, in Fig. 1, the anode of the outfan of Flyback power cell 101 is born with LED
The positive pole carried is connected, and the negative terminal of the outfan of non-isolation DC/DC converter unit 102 is born with described LED
The negative pole carried is connected；In actual applications, it would however also be possible to employ non-isolation DC/DC converter unit 102 defeated
The anode going out end is connected with the positive pole of LED load, the negative terminal of the outfan of Flyback power cell 101
It is connected with the negative pole of described LED load；Fig. 1 is only a kind of example, Flyback power cell 101 with
The connected mode of non-isolation DC/DC converter unit 102 and described LED load is also not specifically limited,
Depending on can be according to the applied environment of its reality.
Concrete operation principle is:
Voltage loop controls to be a kind of control mode being usually used in on-off circuit, is used for controlling described switch electricity
The duty of road breaker in middle, it is possible to make the output voltage stabilization of on-off circuit in a certain value.Prior art
In Voltage loop control circuit generally include the regulation circuit of the device such as integrated transporting discharging and capacitance-resistance, and often
Regulate for closed loop；Described Voltage loop control circuit is usually provided with reference edge (connecting a reference signal)
With sampling end (connecting the sampled signal of sign output voltage) so that this sampled signal followed by this benchmark
Signal intensity, has reached the output voltage stabilization purpose at a certain magnitude of voltage of described on-off circuit；If should
Reference signal changes, then output voltage also can change accordingly.This utility model have employed above-mentioned Voltage loop control
Principle processed.
In the present embodiment, Flyback power cell 101 is permanent for the output electric current controlling whole drive circuit
Fixed；Ripple acquiring unit 103 obtains output ripple (the described output stricture of vagina with Flyback power cell 101
Ripple includes output current ripple or output voltage ripple) relevant feedback signal VFB；Voltage loop controls single
Unit 104 receives relevant for output voltage V2 sampled signal VS to non-isolation DC/DC converter unit 102,
Export control signal VC according to sampled signal VS and feedback signal VFB and convert to non-isolation DC/DC single
Unit 102, controls output voltage ripple and the Flyback power list of non-isolation DC/DC converter unit 102
The output voltage ripple opposite in phase of unit 101, to reach the technique effect of both ripple opposite in phase；
The output voltage waveforms of Flyback power cell 101 as shown in the V1 in Fig. 2, ripple acquiring unit 103
Obtaining feedback signal VFB relevant to the ripple of V1, VFB is equivalent to the AC compounent of V1, and controls
The output voltage of non-isolation DC/DC converter unit 102 with the AC compounent reverse with the ripple of V1,
As shown in the V2 in Fig. 2, so that the output voltage of described Flyback drive circuit is
Vled=V1+V2, thus the ripple of Vled will reduce.For the ripple being completely eliminated on Vled, V2
The size of ripple should equal in magnitude with V1 ripple, in opposite direction.
Flyback drive circuit described in the present embodiment, by Flyback power cell 101 and non-isolated
Jointly drive LED load after DC/DC converter unit 102 series connection, make the ripple in LED load reduce
Even eliminate, it is to avoid output electric current has bigger ripple and causes LED stroboscopic phenomenon occur, and
Export to realize low ripple without accelerating the loop response speed of main circuit, therefore can ensure higher simultaneously
PF value.
What deserves to be explained is, in prior art, cause in order to avoid output electric current has bigger ripple
The stroboscopic phenomenon that LED occurs, the LED driver of employing two-step scheme is also by more selection, thereafter
The input directly outfan with prime AC-DC converter of level DC-DC converter is connected, described before
Level AC-DC converter is used for realizing PFC function, and described rear class DC-DC converter is used for realizing constant current
Or pressure-keeping functions, the control loop response speed of prime AC-DC converter can be very slow, without causing
LED driver output current ripple problem, the control loop response speed of rear class DC-DC converter is permissible
Comparatively fast, meet quickly adjust and reduce output current ripple demand, it is easy to solution single-stage solution exist
Problem.
But two-step scheme has carried out two times transfer due to input power, the efficiency making LED driver is two
The efficiency product of level circuit.Such as front stage circuits efficiency is η 1, and late-class circuit efficiency is η 2, the most existing skill
Art uses the efficiency eta=η 1 × η 2 of the LED driver of two-step scheme, greatly reduces LED driver
Efficiency, increases loss, it is impossible to highlight the advantage that LED illumination System is energy-conservation.
And use the Flyback drive circuit that the present embodiment provides, by above-mentioned connected mode with control former
Reason, it is not necessary to the loop response speed accelerating main circuit realizes low ripple output, therefore can ensure that higher
PF value while, it is achieved low ripple output and efficiently.If the efficiency of Flyback power cell 101
For η 1, the efficiency of non-isolation DC/DC converter unit 102 is η 2, the most described Flyback drive circuit
Efficiency eta is only slightly less than η 1, and the efficiency eta of the described Flyback drive circuit degree less than η 1 depends on non-
Isolation DC/DC converter unit 102 processes the size of power, compared to existing technology in use two-step scheme
LED driver efficiency is high and is lost low.
Another embodiment of this utility model additionally provides a kind of Flyback drive circuit, as it is shown on figure 3, be
The AC compounent of the output voltage V1 of acquisition described Flyback power cell, described ripple acquiring unit
Including: block isolating circuit；The outfan phase of the input of described block isolating circuit and described Flyback power cell
Even, the outfan of described block isolating circuit is connected with the input of described Voltage loop control unit.
Preferably, as it is shown on figure 3, described Flyback power cell includes: primary side winding, the first secondary
Winding the 301, first rectification module, the first switching tube K1 and the first resistance R1；Wherein:
The outfan of the first vice-side winding 301 is connected with the input of described first rectification module；
The outfan of described first rectification module is the outfan of described Flyback power cell；
The different name end of described primary side winding is an input of described Flyback power cell；
The Same Name of Ends of described primary side winding is connected by one end of the first switching tube K1 and the first resistance R1；
The other end of the first resistance R1 is another input of described Flyback power cell；
The control end of the first switching tube K1 receives and drives signal.
Concrete, the primary current sampled signal of described Flyback power cell according to described driving signal
Control the signal of described Flyback drive circuit current stabilization output, in the present embodiment, by the first resistance R1
Sampling primary current.
Described Flyback power cell uses primary current control mode to control the output electric current of whole circuit,
Its current stabilization is made to export；Described primary current control mode is, any secondary side signal of not sampling directly is sampled
Former limit signal (current signal of the most former limit the first switching tube K1), changes the first switching tube with this
The duty of K1, reaches to control the purpose of the output electric current of described Flyback drive circuit.
Concrete, described Flyback power cell controls the output electric current of whole circuit so that flow through LED
The current stabilization of load, the size variation of LED load, the output electricity of the most described Flyback power cell
The size respective change of pressure V1, its value size is limited by the maximum output voltage of described Flyback power cell
System.
Optionally, the Flyback drive circuit that this utility model provides can also be used in light adjusting circuit,
In the present embodiment, described Flyback drive circuit also includes dimming control unit, and dimming control unit is defeated
The dim signal gone out also is the former limit acting on described Flyback power cell, is used for changing whole circuit
Output electric current.Concrete can be by changing size or the ginseng of the sampling resistor that is first resistance R1 on former limit
Examine benchmark size or change the operating frequency of the first switching tube K1 or change the driving of the first switching tube
The dutycycle of signal, changes the output electric current of whole drive circuit, Flyback merit described in dimming process
The output voltage V1 of rate unit also can change.
Preferably, as it is shown on figure 3, described Flyback power cell also includes: the second vice-side winding 302
With the second rectification module；The outfan of the second vice-side winding 302 and the input of described second rectification module
It is connected；The input phase of the outfan of described second rectification module and described non-isolation DC/DC converter unit
Even.
In the present embodiment, the input of described non-isolation DC/DC converter unit passes through described second rectification module
Being connected with the second vice-side winding 302, its input voltage vin comes from the change of described Flyback power cell
Change, obtained by the second vice-side winding 302.In concrete actual application, described non-isolation DC/DC
The input of converter unit can also connect a constant pressure source, to provide constant input voltage.Do not do
Concrete restriction, all in the protection domain of the application.
Preferably, described Voltage loop control unit also receives reference signal Vref；Concrete, in order to ensure
Fall ripple effect under different loads, reference signal Vref that described Voltage loop control unit receives should be greater than
Half equal to the peak-to-peak value of V1 maximum ripple；And when equal to half, the efficiency of whole circuit is the highest,
Refer under same load, same fall ripple effect it should be noted that efficiency here is the highest, Vref
Higher more than efficiency during half than Vref equal to efficiency during half.
When described Voltage loop control unit is integrated in chip, reference signal Vref can also be to be built in
Described Voltage loop control unit.
When non-dimming application, the value of Vref should be greater than equal to the half of its peak-to-peak value during ripple maximum；Should
When being used in light adjusting circuit, the value of Vref also should be greater than the peak-to-peak equal to the maximum ripple occurred in dimming process
The half of value, during to ensure ripple maximum, also can be completely eliminated ripple.
Preferably, as shown in Figure 4, described Flyback power cell includes: primary side winding, the first secondary
Winding the 401, first switching tube K1, the first diode D1, the first resistance R1 and the first output filtered electrical
Hold C1；Wherein:
The anode of the first diode D1 and the Same Name of Ends of the first vice-side winding 401 are connected, and constitute the first rectification
Unit；
The negative electrode of the first diode D1 and one end of the first output filter capacitor C1 are connected；
The other end of the first output filter capacitor C1 and the different name end of the first vice-side winding 401 are connected；
The two ends of the first output filter capacitor C1 are respectively two outfans of described Flyback power cell；
The different name end of described primary side winding is an input of described Flyback power cell；
The Same Name of Ends of described primary side winding is connected by one end of the first switching tube K1 and the first resistance R1；
The other end of the first resistance R1 is another input of described Flyback power cell, and ground connection；
The control end of the first switching tube K1 receives and drives signal.
Concrete, the primary current sampled signal of described Flyback power cell according to described driving signal
Control the signal of described Flyback drive circuit current stabilization output.
In the present embodiment, described primary current sampled signal is obtained by the first resistance R1.
Preferably, as shown in Figure 4, described non-isolation DC/DC converter unit is buck circuit；Described
Buck circuit includes: second switch pipe K2, the second diode D2 and the first inductance L1；Wherein:
One end of second switch pipe K2 is an input of described non-isolation DC/DC converter unit；
The other end of second switch pipe K2 and the negative electrode of the second diode D2 and one end of the first inductance L1
It is connected；
The anode of the second diode D2 is another input of described non-isolation DC/DC converter unit；
The anode of the second diode D2 and the other end of the first inductance L1 are respectively described non-isolation DC/DC
Two outfans of converter unit.
The external input voltage vin of input of described non-isolation DC/DC converter unit, in described non-isolated
The outfan parallel connection high-frequency filter capacitor (the i.e. second electric capacity C2) of DC/DC converter unit, makes described LED
Without high fdrequency component in the electric current of load.
Preferably, as shown in Figure 4, described ripple acquiring unit includes: difference channel and block isolating circuit；
Wherein:
Two inputs of described difference channel respectively with two outfans of described Flyback power cell
It is connected, for obtaining the output voltage of described Flyback power cell；
The input of described block isolating circuit connects the outfan of described difference channel, is used for obtaining described
The AC compounent of Flyback power cell output voltage, obtains feedback signal VFB；
The outfan output feedback signal VFB of described block isolating circuit, and with described Voltage loop control unit
Input is connected.
Preferably, as shown in Figure 4, sampled signal VS that described Voltage loop control unit receives is directly from non-
The outfan of isolation DC/DC converter unit obtains.
Described Voltage loop control unit also receives reference signal Vref；Or in described Voltage loop control unit
It is equipped with default reference signal Vref；The magnitude of voltage of reference signal Vref is more than or equal to described Flyback merit
The half of the peak-to-peak value of the output voltage maximum ripple of rate unit.
Concrete, in order to ensure to drop ripple effect, reference signal Vref that described Voltage loop control unit receives
Should be greater than the half of peak-to-peak value equal to V1 maximum ripple；And when equal to half, the effect of whole circuit
Rate is the highest, it should be noted that efficiency here is the highest refers to same load, same fall ripple effect
Under Guo, Vref is higher more than efficiency during half than Vref equal to efficiency during half.
Preferably, described Flyback drive circuit also includes dimming control unit, described dimming control unit
Outfan output dim signal to the former limit of described Flyback power cell, be used for changing whole circuit
Output electric current.
When non-dimming application, the value of Vref should be greater than equal to the half of its peak-to-peak value during ripple maximum；Should
When being used in light adjusting circuit, the value of Vref also should be greater than the peak-to-peak equal to the maximum ripple occurred in dimming process
The half of value, during to ensure ripple maximum, also can be completely eliminated ripple.
Preferably, described Voltage loop control unit includes: subtractor and the first integrated transporting discharging；Described subtraction
One input of device receives described reference signal Vref, another input of described subtractor and described stricture of vagina
The outfan of ripple acquiring unit is connected；One of the outfan of described subtractor and described first integrated transporting discharging
Input is connected；Another input of described first integrated transporting discharging receives sampled signal VS；Described first
Outfan output control signal VC of integrated transporting discharging；
Or, described Voltage loop control unit includes: adder and the second integrated transporting discharging；Described adder
An input be connected with the outfan of described ripple acquiring unit；Another input of described adder
End receives sampled signal VS；The outfan of described adder and an input of described second integrated transporting discharging
It is connected；Another input of described second integrated transporting discharging receives described reference signal Vref；Described second
Outfan output control signal VC of integrated transporting discharging.
With reference to shown in Fig. 4, described non-isolation DC/DC converter unit is buck circuit, described Voltage loop
Control unit receives reference signal Vref, obtains feedback signal VFB and sampled signal VS；Wherein, for
Acquisition feedback signal VFB, described Flyback drive circuit obtains described by described difference channel
The output voltage V1 of Flyback power cell, the AC compounent being obtained V1 by described block isolating circuit is obtained
Feedback signal VFB；Sampled signal VS is the output voltage V2 of buck circuit.Relation control according to three
The duty of the second switch pipe K2 in buck circuit processed, makes the output voltage V2's of buck circuit
The AC compounent of AC compounent and V1 is cancelled out each other.It is concrete it may be that Vref with VFB subtracts each other as adopting
The reference signal of sample signal VS, thus controls the duty of switching tube.Can also be VS and VFB
The duty of second switch pipe K2 is relatively controlled compared with Vref after addition.
In this utility model, each embodiment uses the mode gone forward one by one to describe, and each embodiment stresses
Being all the difference with other embodiments, between each embodiment, identical similar portion sees mutually.
For device disclosed in embodiment, owing to it corresponds to the method disclosed in Example, so describing
Fairly simple, relevant part sees method part and illustrates.
Below it is only preferred implementation of the present utility model, makes to skilled artisans appreciate that or real
Existing this utility model.To the multiple amendment of these embodiments will be to one skilled in the art aobvious and
Being clear to, generic principles defined herein can be without departing from spirit or scope of the present utility model
In the case of, realize in other embodiments.Therefore, this utility model is not intended to be limited to illustrated herein
These embodiments, and be to fit to consistent with principles disclosed herein and features of novelty the widest
Scope.
Claims (10)
1. a Flyback drive circuit, it is characterised in that including:
Primary current control mode is used to obtain Flyback power cell and the non-isolated stably exporting electric current
DC/DC converter unit；Described Flyback power cell and described non-isolation DC/DC converter unit defeated
Go out end series connection, jointly drive LED load；
The ripple obtaining the feedback signal relevant to the output ripple of described Flyback power cell obtains single
Unit, described output ripple includes output current ripple or output voltage ripple；
Receive the sampled signal relevant to the output voltage of described non-isolation DC/DC converter unit, according to institute
State sampled signal and described feedback signal outputs control signals to described non-isolation DC/DC converter unit, control
Make the output ripple of described non-isolation DC/DC converter unit and the output wave of described Flyback power cell
The Voltage loop control unit of stricture of vagina opposite in phase.
Flyback drive circuit the most according to claim 1, it is characterised in that described ripple obtains
Take unit to include: block isolating circuit；The input of described block isolating circuit is defeated with described Flyback power cell
Going out end to be connected, the outfan of described block isolating circuit is connected with the input of described Voltage loop control unit.
Flyback drive circuit the most according to claim 1, it is characterised in that described ripple obtains
Take unit to include: difference channel and block isolating circuit；Wherein:
Two inputs of described difference channel respectively with two outfans of described Flyback power cell
It is connected；
The outfan of described difference channel is connected with the input of described block isolating circuit；
The outfan of described block isolating circuit is connected with the input of described Voltage loop control unit.
Flyback drive circuit the most according to claim 1, it is characterised in that described Flyback
Power cell includes: primary side winding, the first vice-side winding, the first rectification module, the first switching tube and
One resistance；Wherein:
The outfan of described first vice-side winding is connected with the input of described first rectification module；
The outfan of described first rectification module is the outfan of described Flyback power cell；
The different name end of described primary side winding is an input of described Flyback power cell；
The Same Name of Ends of described primary side winding is by one end phase of described first switching tube with described first resistance
Even；
The other end of described first resistance is another input of described Flyback power cell；
The control end of described first switching tube receives and drives signal；
According to described driving signal, the primary current sampled signal of described Flyback power cell controls institute
State the signal of Flyback drive circuit current stabilization output.
Flyback drive circuit the most according to claim 4, it is characterised in that described Flyback
Power cell also includes: the second vice-side winding and the second rectification module；The output of described second vice-side winding
End is connected with the input of described second rectification module；The outfan of described second rectification module is non-with described
The input of isolation DC/DC converter unit is connected.
Flyback drive circuit the most according to claim 1, it is characterised in that described non-isolated
DC/DC converter unit is buck circuit；Described non-isolation DC/DC converter unit includes: second switch
Pipe, the second diode and the first inductance；Wherein:
One end of described second switch pipe is an input of described non-isolation DC/DC converter unit；
The other end of described second switch pipe and the negative electrode and the one of described first inductance of described second diode
End is connected；
The anode of described second diode is another input of described non-isolation DC/DC converter unit；
The other end of described first inductance and the anode of described second diode are respectively described non-isolated
Two outfans of DC/DC converter unit.
Flyback drive circuit the most according to claim 1, it is characterised in that described Voltage loop
The described sampled signal that control unit receives obtains from the outfan of described non-isolation DC/DC converter unit.
Flyback drive circuit the most according to claim 1, it is characterised in that described Voltage loop
Control unit also receives reference signal；
Or described Voltage loop control unit is built-in with default reference signal；
The magnitude of voltage of described reference signal is maximum more than or equal to the output voltage of described Flyback power cell
The half of the peak-to-peak value of ripple.
Flyback drive circuit the most according to claim 8, it is characterised in that described Voltage loop
Control unit includes: subtractor and the first integrated transporting discharging；One input of described subtractor receives described
Reference signal, another input of described subtractor receives the described feedback of described ripple acquiring unit output
Signal；The outfan of described subtractor is connected with an input of described first integrated transporting discharging；Described
Another input of one integrated transporting discharging receives described sampled signal；
Or, described Voltage loop control unit includes: adder and the second integrated transporting discharging；Described adder
Input receive the described feedback signal of described ripple acquiring unit output；Described adder another
One input receives described sampled signal；The outfan of described adder and described second integrated transporting discharging
One input is connected；Another input of described second integrated transporting discharging receives described reference signal；
Described Voltage loop control unit is according to described reference signal, described feedback signal and described sampled signal
Output control signal.
10. according to the arbitrary described Flyback drive circuit of claim 1-9, it is characterised in that also wrap
Including dimming control unit, the outfan output dim signal of described dimming control unit is to described Flyback merit
The former limit of rate unit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620352807.6U CN205546103U (en) | 2016-04-22 | 2016-04-22 | Flyback drive circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620352807.6U CN205546103U (en) | 2016-04-22 | 2016-04-22 | Flyback drive circuit |
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| CN205546103U true CN205546103U (en) | 2016-08-31 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110798947A (en) * | 2019-11-18 | 2020-02-14 | 杭州优特电源有限公司 | Multi-path LED driving circuit |
| CN112788814A (en) * | 2021-01-27 | 2021-05-11 | 茂硕电源科技股份有限公司 | Non-isolated AC-DC constant current driver and LED lighting equipment |
| CN113923823A (en) * | 2021-01-26 | 2022-01-11 | 上海鸣志自动控制设备有限公司 | Multi-path LED output control circuit based on synchronous out-of-phase control |
-
2016
- 2016-04-22 CN CN201620352807.6U patent/CN205546103U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110798947A (en) * | 2019-11-18 | 2020-02-14 | 杭州优特电源有限公司 | Multi-path LED driving circuit |
| CN110798947B (en) * | 2019-11-18 | 2024-06-11 | 杭州优特电源有限公司 | Multipath LED driving circuit |
| CN113923823A (en) * | 2021-01-26 | 2022-01-11 | 上海鸣志自动控制设备有限公司 | Multi-path LED output control circuit based on synchronous out-of-phase control |
| CN112788814A (en) * | 2021-01-27 | 2021-05-11 | 茂硕电源科技股份有限公司 | Non-isolated AC-DC constant current driver and LED lighting equipment |
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