CN207720026U - A kind of resonant control circuit and power supply reducing ripple - Google Patents
A kind of resonant control circuit and power supply reducing ripple Download PDFInfo
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- CN207720026U CN207720026U CN201721735296.7U CN201721735296U CN207720026U CN 207720026 U CN207720026 U CN 207720026U CN 201721735296 U CN201721735296 U CN 201721735296U CN 207720026 U CN207720026 U CN 207720026U
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Abstract
The utility model is related to a kind of resonant control circuit and power supply reducing ripple, which includes：Governor circuit for generating first switch signal and second switch signal；It is arranged in the input terminal of power supply, for receiving input signal and generating the input circuit of input current；It connect, receive with input circuit and governor circuit respectively and according to first switch signal conduction or the first switch circuit of shutdown；It is connect with first switch circuit, input current is received in first switch circuit turn-on and generate the resonance circuit of resonance current；And the shunt circuit being connect respectively with resonance circuit and input circuit；Shunt circuit shunts resonance current, and generates feedback current to input circuit to reduce input ripple.The utility model can effectively reduce the ripple of power supply, extend the service life of power supply, and the efficiency of power supply also can be improved, reduce loss and this circuit structure is simple, easy to operate, cost of implementation is low.
Description
Technical field
The utility model is related to the technical fields of power supply, and electricity is controlled more specifically to a kind of resonance reducing ripple
Road and power supply.
Background technology
Traditional LLC circuit structure composition has four parts, respectively importation, switching control section, resonance portion and
Output par, c, importation mainly receive input current, and switching control section is mainly the resonance portion for controlling receipt of subsequent
Working frequency, wherein resonance portion is generally made of inductance, the armature winding of transformer and capacitance, and output composition is for defeated
Go out signal.
The cavity current circuit of the resonance portion of traditional circuit is one-way flow, i.e. electric current is flowed into from inductance end by just
Grade winding is flowed out from capacity earth end again；Or it flows into from capacity earth end and is flowed out from inductance by armature winding；Such work side
That there are loop currents is larger for formula, and the current ripples of capacitance are larger.So that the lost of life of capacitance, causes the service life of power supply to reduce.
Utility model content
The technical problem to be solved by the present invention is to for the drawbacks described above of the prior art, provide a kind of reduction line
The resonant control circuit and power supply of wave.
Technical solution adopted by the utility model to solve its technical problems is：Construct a kind of resonance control reducing ripple
Circuit, including：
Governor circuit for generating first switch signal and second switch signal；
It is arranged in the input terminal of power supply, for receiving input signal and generating the input circuit of input current；
Connect, receive with the input circuit and the governor circuit respectively and according to the first switch signal conduction or
The first switch circuit of shutdown；
It connect with the first switch circuit, receive the input current in the first switch circuit turn-on and generate
The resonance circuit of resonance current；And the shunt circuit being connect respectively with the resonance circuit and the input circuit；
The shunt circuit shunts the resonance current, and generates feedback current to the input circuit to reduce
Input ripple.
Preferably, the input circuit includes input capacitance C6, first end and the power supply of the input capacitance C6
Input terminal connects, the second end of input capacitance C6 ground connection, the first end of the input capacitance C6 also with the first switch
Circuit connects.
Preferably, the first switch circuit includes the first metal-oxide-semiconductor, grid and the master control electricity of first metal-oxide-semiconductor
Road connects, and the drain electrode of first metal-oxide-semiconductor connect with the first end of the input capacitance C6, the source electrode of first metal-oxide-semiconductor and
The resonance circuit connection.
Preferably, the resonance circuit includes resonant inductance LS, the armature winding N1 of transformer T and resonant capacitance C1；
The first end of the resonant inductance LS is connect with the source electrode of first metal-oxide-semiconductor, and the second of the resonant inductance LS
End connect with the input terminal of the armature winding N1 of the transformer T, the output end of the armature winding N1 of the transformer T with it is described
The first end of resonant capacitance C1 connects, the second end ground connection of the resonant capacitance C1.
Preferably, further include：
It is connected in parallel between the input terminal and output end of the resonance circuit, receives the second switch signal, and according to institute
State second switch signal conduction or the second switch circuit of shutdown；
The first end of the resonant inductance LS is the input terminal of the resonance circuit, and the second end of the resonant capacitance C1 is
The output end of the resonance circuit.
Preferably, the second switch circuit includes the second metal-oxide-semiconductor, drain electrode and the resonance electricity of second metal-oxide-semiconductor
Feel the first end connection of LS, the drain electrode of second metal-oxide-semiconductor and the connecting node of the first end of the resonant inductance LS also with institute
The source electrode connection of the first metal-oxide-semiconductor is stated, the grid of second metal-oxide-semiconductor is connect with the governor circuit, the source of second metal-oxide-semiconductor
Pole connect and is connected to the ground with the second end of the resonant capacitance C1.
Preferably, the shunt circuit includes shunting capacitance C4, first end and the resonance electricity of the shunting capacitance C4
Hold the first end connection of C1, the second end of the shunting capacitance C4 is connect with the first end of the input capacitance C6.
Preferably, further include：
Output end, the output rectification circuit for generating supply voltage for being connected to power supply；
The output end of the power supply includes positive output end and negative output terminal, and the output rectification circuit includes the first output end
And second output terminal, wherein the first output end of the output rectification circuit is connect with the positive output end of the power supply, described defeated
The second output terminal for going out rectification circuit is connect with the negative output terminal of the power supply.
Preferably, the output rectification circuit includes output circuit and current rectifying and wave filtering circuit；
The output circuit includes the second output winding N2 and third output winding N3 of transformer T, the rectifying and wave-filtering
Circuit includes resistance R10, capacitance C10, diode D7, resistance R11, capacitance C11 and diode D7A；
The first end of the second output winding N2 is connect with the anode of the diode D7, the cathode of the diode D7
It is connect with the positive output end of the power supply, the first end of the resistance R10 is connect with the anode of the diode D7, the resistance
The second end of R10 is connect with the first end of the capacitance C10, the positive output end of the second end and the power supply of the capacitance C10
Connection；The cathode of the second end of the capacitance C10 and the diode D7 are the first output end of the output rectification circuit；
The second end of the second output winding N2 is connect with the first end of third output winding N3, and described second is defeated
The second end for going out winding N2 and the connecting node of first end of third output winding N3 connect with the negative output terminal of the power supply
Connect, the second end of third output winding N3 is connect with the anode of the diode D7A, the cathode of the diode D7A and
The cathode of the diode D7 connects, and the first end of the resistance R11 is connect with the anode of the diode D7A, the resistance
The second end of R11 is connect with the first end of the capacitance C11, the cathode of the second end of the capacitance C11 and the diode D7A
Connection；
The second end of the second output winding N2 and the first end of third output winding N3 are the output rectification circuit
Second output terminal.
Also a kind of power supply of the utility model, including the above-described resonant control circuit for reducing ripple.
The resonant control circuit for implementing the reduction ripple of the utility model, has the advantages that：The utility model
The ripple of power supply can effectively be reduced by reducing the resonant control circuit of ripple, substantially prolonged the service life of power supply, can also be carried
The efficiency of high power supply reduces loss and this circuit structure is simple, easy to operate, cost of implementation is low.
Description of the drawings
Below in conjunction with accompanying drawings and embodiments, the utility model is described in further detail, in attached drawing：
Fig. 1 is the structural schematic diagram for the resonant control circuit embodiment one that the utility model reduces ripple；
Fig. 2 is the circuit diagram for the resonant control circuit embodiment that the utility model reduces ripple；
Fig. 3 is the current ripples oscillogram of traditional circuit；
Fig. 4 is the current ripples oscillogram of the utility model；
Fig. 5 is the ripple current and voltage oscillogram of traditional circuit；
Fig. 6 is the ripple current and voltage oscillogram of the utility model.
Specific implementation mode
For a clearer understanding of the technical features, objectives and effects of the utility model, now control attached drawing is detailed
Illustrate specific embodiment of the present utility model.
Refering to fig. 1, Fig. 1 is a kind of structure of resonant control circuit embodiment one reducing ripple provided by the utility model
Schematic diagram.The resonant control circuit of the reduction ripple of the utility model can be applied based on the circuit design of LLC topological structures
In the product of the power supplys classes such as illumination class power supply, LED power, adapter, charger, communication power supply, inverter.
As shown in Figure 1, the resonant control circuit of the reduction ripple of the present embodiment may include governor circuit, input circuit
10, first switch circuit 20, resonance circuit 30 and shunt circuit 40 is connect with resonance circuit 30 and input circuit 10 respectively.It is defeated
Enter circuit 10 to be arranged in the input terminal of power supply, for receiving input signal and generating input current；First switch circuit 20, respectively
It connect, receive with input circuit 10 and governor circuit and according to first switch signal conduction or shutdown；Resonance circuit 30 and first
The connection of switching circuit 20 receives input current when first switch circuit 20 is connected and generates the resonance circuit 30 of resonance current；
Shunt circuit 40 shunts resonance current, and generates feedback current to input circuit 10 to reduce input ripple.
Specifically, governor circuit (not shown), is arranged the primary side in power supply, it can generate and generate first switch letter respectively
Number and second switch signal, specifically, governor circuit include the first control terminal and the second control terminal, pass through the first control terminal export
First switch signal exports second switch signal by the second control terminal.Wherein, governor circuit may include power supply IC, and first
Switching signal and second switch signal are generated by power supply IC.First switch signal and second switch signal are pwm signal, can be used
In the working frequency for the resonant cavity for adjusting resonance circuit 30.
Input circuit 10 may include input capacitance C6, and the first end of input capacitance C6 and the input terminal of power supply connect, defeated
Enter the second end ground connection of capacitance C6, the first end of input capacitance C6 is also connect with first switch circuit 20.It is to be appreciated that input
Mainly when power supply is powered, access input signal simultaneously charges capacitance C6, terminates to start to discharge in charging, and from its first end
Discharge current is exported, which is input current, which is alternating current.
Optionally, input capacitance C6 can be electrolytic capacitor.
First switch circuit 20 is connect with governor circuit and input circuit 10 respectively, according to the first of governor circuit output
Switching signal on or off, and then adjust the working frequency of the resonance circuit 30 of rear class access.
Alternatively, the first switch circuit 20 of the present embodiment may include the first metal-oxide-semiconductor, the grid of the first metal-oxide-semiconductor with
Governor circuit connection (being specially to be connect with the first control terminal of governor circuit), the drain electrode of the first metal-oxide-semiconductor is with input capacitance C6's
First end connects, and the source electrode of the first metal-oxide-semiconductor is connect with resonance circuit 30.Specifically, working as received by the grid of the first metal-oxide-semiconductor
When switching signal is high level signal, the first metal-oxide-semiconductor conducting, the drain electrode of the first metal-oxide-semiconductor is connected with source electrode, and the of input capacitance C6
The input current of one end output flow to resonance circuit 30 by the drain electrode and source electrode of the first metal-oxide-semiconductor.
Further, in order to reduce interference signal caused by the parasitic capacitance of the first metal-oxide-semiconductor, in the leakage of the first metal-oxide-semiconductor
It can be also connected in parallel with a capacitor between pole and source electrode, reduce the interference signal of the parasitic capacitance of the first metal-oxide-semiconductor by the capacitance, make electricity
The signal on road is more stablized.Optionally, capacitance in parallel can be patch capacitor.
Further, the resonant control circuit of the reduction ripple of the present embodiment can also include second switch circuit 50,
In, second switch circuit 50 is connected in parallel between the input terminal and output end of resonance circuit 30, for receiving governor circuit offer
Second switch signal, and according to the second switch signal conduction or shutdown.Wherein, governor circuit is controlled by first switch signal
When first switch circuit 20 is connected, while second switch circuit 50 is controlled by second switch signal and is turned off；Or governor circuit
When controlling 20 shutdown of first switch circuit by first switch signal, while passing through second switch signal and controlling second switch circuit
50 conductings.It follows that first switch circuit 20 and second switch circuit 50 will not be simultaneously turned on and will not be simultaneously turned off, and it is logical
The turn-on and turn-off synergistic effect for crossing first switch circuit 20 and second switch circuit 50, can steadily control resonance circuit 30
Working frequency, to adjust the output current of power supply.
Alternatively, the second switch circuit 50 of the present embodiment may include the second metal-oxide-semiconductor, the drain electrode of the second metal-oxide-semiconductor with
The first end of resonant inductance LS connects, and the connecting node of the drain electrode of the second metal-oxide-semiconductor and the first end of resonant inductance LS is also with first
The source electrode of metal-oxide-semiconductor connects, and it (is specially to connect with the second control terminal of governor circuit that the grid of the second metal-oxide-semiconductor is connect with governor circuit
Connect), the source electrode of the second metal-oxide-semiconductor connect and is connected to the ground with the second end of resonant capacitance C1.Wherein, the first end of resonant inductance LS
For the input terminal of resonance circuit 30, the second end of resonant capacitance C1 is the output end of resonance circuit 30.
Resonance circuit 30 is connected in the conducting of first switch circuit 20 and the shutdown of second switch circuit 50, i.e., at this point, input
The input current that capacitance generates is after the drain electrode of the first metal-oxide-semiconductor and source electrode, since the second metal-oxide-semiconductor turns off, input current is straight
Stream flows into resonance circuit 30, and resonance current is generated by the resonance effect of resonance circuit 30.
Optionally, the resonance circuit 30 of the present embodiment may include resonant inductance LS, transformer T armature winding N1 and
Resonant capacitance C1.The first end of resonant inductance LS is connect with the source electrode of the first metal-oxide-semiconductor, the second end and transformer of resonant inductance LS
The input terminal of the armature winding N1 of T connects, and the output end of the armature winding N1 of transformer T connects with the first end of resonant capacitance C1
It connects, the second end ground connection of resonant capacitance C1.
Wherein, the armature winding N1 of resonant inductance LS and transformer T forms series resonant tank, and series resonant tank generates
Resonance current through when resonant capacitance C1 generate shunting, i.e., one part of current flows back to ground wire, another part by resonant capacitance C1
Feedback current is formed after being shunted by shunt circuit 40, which flows back to the input terminal of power supply.
Shunt circuit 40 is connect with resonance circuit 30 and input circuit 10 respectively, specially the input terminal of shunt circuit 40
It is connect with resonance circuit 30, the output end of shunt circuit 40 is connect with input circuit 10, for carrying out shunting production to resonance current
Raw feedback current, and feedback current is back to input circuit 10.By increasing resonance of the shunt circuit 40 to resonance circuit 30
Electric current is shunted, and generated feedback current is back to input circuit 10, and the input terminal of power supply can be made to flow out input
The current ripples that the current ripples of capacitance C6 are returned with shunt circuit 40 are overlapped mutually, and so that total current ripples amplitude is subtracted into face
It is small, while the frequency of current ripples can be made to increase.
Alternatively, the shunt circuit 40 of the present embodiment may include shunting capacitance C4.Wherein, the capacitance of shunting capacitance C4
Value can be determined according to power requirement and the ripple size of required reduction.The utility model is not especially limited.For example, shunting
The capacitance of capacitance C4 can be identical as the capacitance of resonant capacitance C1, can also be different.When shunting capacitance C4 capacitance with
When the capacitance of resonant capacitance C1 is identical, the ripple that can be reduced at this time is original one times, you can current ripples amplitude is made to drop
Low is original half, while the frequency of current ripples becomes twice as.
It can be seen that apparent improvement result can be played to the current ripples of capacitance in circuit by increasing shunting capacitance C4,
When shunting capacitance C4 is identical as the capacitance of resonant capacitance C1, the current ripples amplitude of original traditional capacitance can be reduced
Half greatly improves the service life of capacitance, and then extends the service life of power supply, is extending the same of the service life of power supply
When, the efficiency of power supply can also be improved, the dead resistance parallel connection of resonant capacitance C1 and shunting capacitance C4 also only have than traditional
Smaller is lost caused by one resonant capacitance C1, you can to reduce loss.
Specifically, in the present embodiment, the first end of shunting capacitance C4 is connect with the first end of resonant capacitance C1, shunting electricity
The second end for holding C4 is connect with the first end of input capacitance C6.
Optionally, the resonant control circuit of the reduction ripple of the present embodiment can also include output rectification circuit 60, this is defeated
Go out rectification circuit 60 and is connected to the output end of power supply, the output rectification circuit 60 for generating supply voltage.
Specifically, the output end of power supply includes positive output end and negative output terminal, and output rectification circuit 60 includes the first output
End and second output terminal, wherein the first output end of output rectification circuit 60 and the positive output end of power supply connect, and export rectified current
The second output terminal on road 60 and the negative output terminal of power supply connect.
Further, output rectification circuit 60 includes output circuit 601 and current rectifying and wave filtering circuit 602.
Output circuit 601 includes that the second output winding N2 of transformer T and third export winding N3, current rectifying and wave filtering circuit
602 include resistance R10, capacitance C10, diode D7, resistance R11, capacitance C11 and diode D7A.
The first end of second output winding N2 is connect with the anode of diode D7, the cathode of diode D7 and power supply it is just defeated
Outlet connects, and the first end of resistance R10 is connect with the anode of diode D7, the first end of the second end and capacitance C10 of resistance R10
Connection, the second end of capacitance C10 and the positive output end of power supply connect；The cathode of the second end of capacitance C10 and diode D7 are defeated
Go out the first output end of rectification circuit 60.
The second end of second output winding N2 is connect with the first end of third output winding N3, and second exports the of winding N2
The connecting node of first end and the negative output terminal of power supply of two ends and third output winding N3 connects, and the of third output winding N3
Two ends are connect with the anode of diode D7A, and the cathode of diode D7A is connect with the cathode of diode D7, the first end of resistance R11
Connect with the anode of diode D7A, the second end of resistance R11 is connect with the first end of capacitance C11, the second end of capacitance C11 with
The cathode of diode D7A connects；The second end of second output winding N2 and the first end of third output winding N3 are output rectification
The second output terminal of circuit 60.
The resonant control circuit of the reduction ripple of the utility model generates resonance circuit 30 by the way that shunt circuit 40 is arranged
Resonance current shunted and be back to input circuit 10, solve the problems, such as that the current ripples of input circuit 10 are larger, no
The ripple that only can effectively reduce power supply, substantially prolongs the service life of power supply, can also improve the efficiency of power supply, reduces damage
It consumes and this circuit structure is simple, easy to operate, cost of implementation is low.
Referring to Fig.2, Fig. 2 is the circuit diagram of one embodiment of resonant control circuit of the reduction ripple of the utility model.
As shown in Fig. 2, input terminal of the input circuit 10 of the present embodiment including input capacitance C6, power supply is VIN, first switch circuit 20
Include the second metal-oxide-semiconductor Q2 including the first metal-oxide-semiconductor Q1, second switch circuit 50, resonance circuit 30 includes resonant inductance LS, transformer
The armature winding N1 and resonant capacitance C1 of T, shunt circuit 40 include shunting capacitance C4.Output rectification circuit 60 includes transformer T
The second output winding N2, third output winding N3, resistance R10, capacitance C10, diode D7, resistance R11, capacitance C11 and two
Pole pipe D7A, the positive output end of power supply is VOUT+, the negative output terminal of power supply is VOUT-.
In this embodiment, shunting capacitance C4 is identical with the capacitance of resonant capacitance C1.
The specific connection relation of the resonant control circuit of the reduction ripple of the present embodiment is：
The first end (positive input terminal) of the input terminal VIN and input capacitance C6 of power supply are connect, the second end of input capacitance C6
Ground connection, the drain electrode of the first metal-oxide-semiconductor Q1 connect with the first end of input capacitance C6, the grid of the first metal-oxide-semiconductor Q1 and governor circuit
First control terminal (INPUT-1) connects, and the source electrode of the first metal-oxide-semiconductor Q1 is connect with the first end of resonant inductance LS, the first metal-oxide-semiconductor Q1
Source electrode also connect with the drain electrode of the second metal-oxide-semiconductor Q2 with the connecting node of the first end of resonant inductance LS, the of resonant inductance LS
Two ends are connect with the first end of the armature winding N1 of transformer T, second end and the resonant capacitance C1 of the armature winding N1 of transformer
First end connected with the first end of shunting capacitance C4, the second end of resonant capacitance C1 is connect simultaneously with the source electrode of the second metal-oxide-semiconductor Q2
It is connected to the ground, the grid of the second metal-oxide-semiconductor Q2 and the second control terminal (INPUT-2) of governor circuit connect.
The second end of shunting capacitance C4 is connect with the first end of input capacitance C6, and the second end of shunting capacitance C4 is connected to
Between the first end of input capacitance C6 and the drain electrode of the first metal-oxide-semiconductor Q1.
Further, patch capacitor C2, the leakage of the second metal-oxide-semiconductor Q2 are parallel between the drain electrode and source electrode of the first metal-oxide-semiconductor Q1
Patch capacitor C3 is parallel between pole and source electrode.
The first end of second output winding N2 is connect with the anode of diode D7, the cathode of diode D7 and power supply it is just defeated
Outlet VOUT+ connections, the first end of resistance R10 are connect with the anode of diode D7, and the second end of resistance R10 is with capacitance C10's
First end connects, and the second end of capacitance C10 is connect with the cathode of diode D7；The second end and third of second output winding N2 is defeated
Go out the first end connection of winding N3, and the connection section of the second end of the second output winding N2 and the first end of third output winding N3
Point is also connect with the negative output terminal VOUT- of power supply, and the second end of third output winding N3 is connect with the anode of diode D7A, and two
The cathode of pole pipe D7A is connect with the cathode of diode D7, and the first end of resistance R11 is connect with the anode of diode D7A, resistance
The second end of R11 is connect with the first end of capacitance C11, and the second end of capacitance C11 is connect with the cathode of diode D7A.
By the above circuit it is found that its concrete operating principle is：
By the effect of shunting capacitance C4, the resonance circuit 30 that series resonant tank (resonance circuit 30) generates can be made to pass through
When resonant capacitance C1 and shunting capacitance C4, shunting is generated, original half will be reduced to by then flowing through the electric current of resonant capacitance C1,
And the electric current for flowing through resonant capacitance C1 flows back to ground wire；The electric current of shunting capacitance C4 is flowed through (with the electric current phase for flowing through resonant capacitance C1
The ends VIN are flowed back to together), and the current ripples for foring the current ripples and shunting capacitance C4 of the ends VIN outflow input capacitance C6 are mutually folded
Add, the half of current ripples amplitude when total current ripples amplitude finally being made to become using single resonant capacitance C1, while electricity
The frequency of flow liner wave becomes twice as.
To sum up, the utility model can be effectively improved the current ripples of capacitance in circuit by introducing shunting capacitance C4, when
It, can be by the current ripples amplitude of original traditional capacitance when used shunting capacitance C4 is identical as the capacitance of resonant capacitance C1
Reduce half, greatly improve the service life of capacitance, and then extend the service life of power supply, and promotes the same of power source life
When the efficiency of power supply also can be improved, the dead resistance parallel connection of resonant capacitance C1 and shunting capacitance C4 may make than resonance is used alone
Smaller is lost caused by capacitance C1, power consumption is lower.
Refering to Fig. 3 and Fig. 4, Fig. 3 is the oscillogram of the current ripples for the input capacitance C6 outflows tested traditional circuit, figure
4 be the oscillogram of the current ripples for the input capacitance C6 outflows tested using the circuit of above-described embodiment, wherein tradition electricity
The resonant capacitance C1+ shunting capacitances C4 of capacitance=the utility model of the resonant capacitance C1 on road.It can from Fig. 3 and Fig. 4
Go out, the current ripples frequency of input capacitance C6 is 142.9KHz in Fig. 4, and the current ripples frequency of input capacitance C6 is in Fig. 3
70.42KHz；The current ripples amplitude of input capacitance C6 is 1.46A in Fig. 4, and the input capacitance C6 current ripples amplitudes of Fig. 3 are
2.9A, excludes error caused by test equipment, and the embodiment of the utility model can be such that the current ripples amplitude of input capacitance C6 subtracts
It is half as large, so that current ripples frequency is become twice as.
It is the current ripples and voltage oscillogram on the resonant capacitance C1 of traditional circuit test refering to Fig. 5 and Fig. 6, Fig. 5,
In, the resonant capacitance C1+ shunting capacitances C4 of capacitance=the utility model of the resonant capacitance C1 of traditional circuit.Fig. 6 is to use
The current ripples and voltage oscillogram for the resonant capacitance C1 that the circuit of above-described embodiment is tested.It can from Fig. 5 and Fig. 6
Go out, the current ripples amplitude of resonant capacitance C1 is 1.96A in Fig. 6, and the current ripples amplitude of resonant capacitance C1 is 4A, row in Fig. 5
Except error caused by test equipment, the embodiment of the utility model can make the current ripples amplitude of resonant capacitance C1 reduce half.
To sum up, the resonant control circuit of the reduction ripple of the utility model can make input electric by introducing shunting capacitance C4
The current ripples amplitude held on C6 and resonant capacitance C1 reduces half than traditional circuit, by the characteristic of capacitance it is found that working as capacitance
On current ripples reduce when the service life of capacitance can be made to extend, and then extension power supply service life.
The utility model also provides a kind of power supply, which may include illumination class power supply, LED power, adapter, charging
The power supplys such as device, communication power supply, inverter.Wherein, which includes the resonant control circuit of above-mentioned reduction ripple, the power supply and biography
System power supply is compared, and the current ripples smaller of capacitance, the service life is longer, better reliability, and power consumption is lower.
Above example is only the technical concepts and features for illustrating the utility model, and its object is to allow be familiar with technique
Personage can understand the content of the utility model and implement accordingly, the scope of protection of the utility model can not be limited.It is all with
The equivalent changes and modifications that the utility model claims range is done, should all belong to the utility model claims covers model
It encloses.
It should be understood that for those of ordinary skills, it can be modified or changed according to the above description,
And all these modifications and variations should all belong to the protection domain of the appended claims for the utility model.
Claims (10)
1. a kind of resonant control circuit reducing ripple, which is characterized in that including：
Governor circuit for generating first switch signal and second switch signal；
It is arranged in the input terminal of power supply, for receiving input signal and generating the input circuit of input current；
It connect, receive with the input circuit and the governor circuit respectively and according to the first switch signal conduction or shutdown
First switch circuit；
It connect with the first switch circuit, receive the input current in the first switch circuit turn-on and generate resonance
The resonance circuit of electric current；And the shunt circuit being connect respectively with the resonance circuit and the input circuit；
The shunt circuit shunts the resonance current, and generates feedback current to the input circuit to reduce input
Ripple.
2. the resonant control circuit according to claim 1 for reducing ripple, which is characterized in that the input circuit includes defeated
Enter capacitance C6, the first end of the input capacitance C6 is connect with the input terminal of the power supply, the second end of the input capacitance C6
Ground connection, the first end of the input capacitance C6 are also connect with the first switch circuit.
3. the resonant control circuit according to claim 2 for reducing ripple, which is characterized in that the first switch circuit packet
Include the first metal-oxide-semiconductor, the grid of first metal-oxide-semiconductor is connect with the governor circuit, the drain electrode of first metal-oxide-semiconductor with it is described defeated
Enter the first end connection of capacitance C6, the source electrode of first metal-oxide-semiconductor is connect with the resonance circuit.
4. the resonant control circuit according to claim 3 for reducing ripple, which is characterized in that the resonance circuit includes humorous
Shake inductance LS, the armature winding N1 of transformer T and resonant capacitance C1；
The first end of the resonant inductance LS is connect with the source electrode of first metal-oxide-semiconductor, the second end of the resonant inductance LS with
The input terminal of the armature winding N1 of the transformer T connects, output end and the resonance of the armature winding N1 of the transformer T
The first end of capacitance C1 connects, the second end ground connection of the resonant capacitance C1.
5. the resonant control circuit according to claim 4 for reducing ripple, which is characterized in that further include：
It is connected in parallel between the input terminal and output end of the resonance circuit, receives the second switch signal, and according to described
The second switch circuit of two switching signal on or off；
The first end of the resonant inductance LS is the input terminal of the resonance circuit, and the second end of the resonant capacitance C1 is described
The output end of resonance circuit.
6. the resonant control circuit according to claim 5 for reducing ripple, which is characterized in that the second switch circuit packet
The second metal-oxide-semiconductor is included, the drain electrode of second metal-oxide-semiconductor is connect with the first end of the resonant inductance LS, the leakage of second metal-oxide-semiconductor
Pole is also connect with the source electrode of first metal-oxide-semiconductor with the connecting node of the first end of the resonant inductance LS, second metal-oxide-semiconductor
Grid connect with the governor circuit, the source electrode of second metal-oxide-semiconductor connect and connects with the second end of the resonant capacitance C1
It is connected to ground.
7. the resonant control circuit according to claim 4 for reducing ripple, which is characterized in that the shunt circuit includes point
Galvanic electricity holds C4, and the first end of the shunting capacitance C4 is connect with the first end of the resonant capacitance C1, the shunting capacitance C4's
Second end is connect with the first end of the input capacitance C6.
8. the resonant control circuit according to claim 1 for reducing ripple, which is characterized in that further include：
Output end, the output rectification circuit for generating supply voltage for being connected to power supply；
The output end of the power supply includes positive output end and negative output terminal, and the output rectification circuit includes the first output end and the
Two output ends, wherein the first output end of the output rectification circuit is connect with the positive output end of the power supply, and the output is whole
The second output terminal of current circuit is connect with the negative output terminal of the power supply.
9. the resonant control circuit according to claim 8 for reducing ripple, which is characterized in that the output rectification circuit packet
Include output circuit and current rectifying and wave filtering circuit；
The output circuit includes the second output winding N2 and third output winding N3 of transformer T, the current rectifying and wave filtering circuit
Including resistance R10, capacitance C10, diode D7, resistance R11, capacitance C11 and diode D7A；
The first end of the second output winding N2 is connect with the anode of the diode D7, the cathode of the diode D7 and institute
The positive output end connection of power supply is stated, the first end of the resistance R10 is connect with the anode of the diode D7, the resistance R10
Second end connect with the first end of the capacitance C10, the second end of the capacitance C10 and the positive output end of the power supply connect
It connects；The cathode of the second end of the capacitance C10 and the diode D7 are the first output end of the output rectification circuit；
The second end of the second output winding N2 is connect with the first end of third output winding N3, described second export around
The second end of group N2 is connect with the connecting node of the first end of third output winding N3 with the negative output terminal of the power supply, institute
The second end for stating third output winding N3 is connect with the anode of the diode D7A, the cathode of the diode D7A and described two
The cathode of pole pipe D7 connects, and the first end of the resistance R11 is connect with the anode of the diode D7A, and the of the resistance R11
Two ends are connect with the first end of the capacitance C11, and the second end of the capacitance C11 is connect with the cathode of the diode D7A；
The second end of the second output winding N2 and the first end of third output winding N3 are the of the output rectification circuit
Two output ends.
10. a kind of power supply, which is characterized in that reduce the resonant control circuit of ripple including claim 1-9 any one of them.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107994778A (en) * | 2017-12-13 | 2018-05-04 | 深圳市崧盛电子股份有限公司 | A kind of resonant control circuit and power supply for reducing ripple |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107994778A (en) * | 2017-12-13 | 2018-05-04 | 深圳市崧盛电子股份有限公司 | A kind of resonant control circuit and power supply for reducing ripple |
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