CN103840647B - Current filtering circuit and supply convertor - Google Patents
Current filtering circuit and supply convertor Download PDFInfo
- Publication number
- CN103840647B CN103840647B CN201410099954.2A CN201410099954A CN103840647B CN 103840647 B CN103840647 B CN 103840647B CN 201410099954 A CN201410099954 A CN 201410099954A CN 103840647 B CN103840647 B CN 103840647B
- Authority
- CN
- China
- Prior art keywords
- circuit
- switch pipe
- power switch
- connects
- signal
- 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)
- Rectifiers (AREA)
- Power Conversion In General (AREA)
Abstract
Present invention is disclosed a kind of current filtering circuit, described current filtering circuit comprises power switch pipe, filter element, filtering compensation circuit, load described in the drain series of described power switch pipe, the source electrode of described power switch pipe exports a ripple signal, the drain electrode of described power switch pipe is connected by one first resistance with grid, described filter element receives described ripple signal, filtering process is carried out to described ripple signal, and export a non-ripple signal, described filtering compensation circuit receives described ripple signal and non-ripple signal respectively, after described ripple signal and non-ripple signal are compared, export a compensating signal, and described compensating signal is fed back to the grid of described power switch pipe, thus can reduce or eliminate working frequency ripple wave, this circuit configuration is simple, cost is low.Present invention further teaches a kind of supply convertor comprising above-mentioned current filtering circuit.
Description
Technical field
The present invention relates to technical field of filtering, particularly relate to a kind of current filtering circuit and supply convertor.
Background technology
AC-DC power supply converter exchanges a kind of supply unit that input converts a direct current output to, has volume little, the advantage that efficiency is high, be therefore widely used in the occasion such as charger for mobile phone and notebook adapter.
Please refer to Fig. 1, Fig. 1 is the circuit diagram of AC-DC power supply converter in prior art.In AC-DC power supply converter, rectification circuit 101 is used for performing rectification process to the AC-input voltage of alternating current input power supplying AC.After rectification circuit 101, there is a filter capacitor C
in, filter capacitor C
inperform filtering process on the one hand, on the other hand, when alternating current input power supplying AC is under-voltage, supply energy to circuit for power conversion 10.Filter capacitor C
inbe connected in parallel with circuit for power conversion 10, through the conversion of circuit for power conversion 10, the input voltage V of described supply convertor 1
in(AC-input voltage) is converted into output voltage V
out(VD), and by output voltage V
outbe supplied to LED even load.
Here, described circuit for power conversion 10 is for flyback power level circuit, and it includes an a transformer T and device for power switching M1, and described transformer T comprises armature winding N
pwith secondary winding N
s, described armature winding N
paccess input voltage V
in, and by induction of signal to secondary winding N
s, described secondary winding N
sthe voltage signal sensed is transferred to the first electric capacity C1, after the first electric capacity C1 filtering process, produces VD V
out.Armature winding N
palso connecting device for power switching M1, by controlling the break-make of device for power switching 125, controlling the work of described circuit for power conversion 10.
In the prior art, in order to improve the operating efficiency of described supply convertor 1 itself, reduce the harmonic pollution to electrical network, supply convertor 1 described in General Requirements itself will have higher power factor simultaneously.Higher power factor (PF) can bring working frequency ripple wave LED even load having about 100Hz, and this can reduce the working life of LED, and simultaneously long-term work under with the LED lamplight of working frequency ripple wave can produce certain harm to human eye.
In order to solve the impact of working frequency ripple wave, prior art generally adopts two-stage solution: PFC (power factor correction) constant-voltage control circuit 102 (prime) and constant-current control circuit 103 (rear class), as shown in Figure 1, prior art generally also comprises the elements such as the first electric capacity Cf and device for power switching M ', for constant-current control circuit 103 couples of output voltage V
outcontrol.PFC constant-voltage control circuit 102 connects the grid of device for power switching M1, controls the voltage with ripple of described circuit for power conversion 10 stable output; Ripple process is carried out again by constant-current control circuit 103.Although the two-step scheme of prior art can eliminate ripple, cost is higher.
Summary of the invention
The object of the invention is to, provide a kind of current filtering circuit and supply convertor, can reduce or eliminate working frequency ripple wave, structure is simple, and cost is low.
For solving the problems of the technologies described above, the invention provides a kind of current filtering circuit, for adjusting the ripple flowing through electric current in load, described current filtering circuit comprises:
Power switch pipe, load described in the drain series of described power switch pipe, the source electrode of described power switch pipe exports a ripple signal, and the drain electrode of described power switch pipe is connected by one first resistance with grid;
Filter element, described filter element receives described ripple signal, carries out filtering process to described ripple signal, and exports a non-ripple signal;
Filtering compensation circuit, described filtering compensation circuit receives described ripple signal and non-ripple signal respectively, after described ripple signal and non-ripple signal being compared, exports a compensating signal, and described compensating signal is fed back to the grid of described power switch pipe;
Described compensating signal is by the drain voltage of power switch pipe described in described first resnstance transformer, and when described non-ripple signal is greater than described ripple signal, the drain voltage of described compensating signal to described power switch pipe provides malleation to compensate; When described non-ripple signal is less than described ripple signal, the drain voltage of described compensating signal to described power switch pipe provides negative pressure compensating.
Further, in described current filtering circuit, described current filtering circuit also comprises vibration start-up circuit, and described vibration start-up circuit comprises:
First switch, one end of described first switch connects the source electrode of described power switch pipe, and the other end of described first switch connects described filtering compensation circuit;
First ON-OFF control circuit, described first ON-OFF control circuit connects the drain electrode of described power switch pipe, by judging the drain voltage of described power switch pipe, export one first switch controlling signal, described first switch controlling signal controls the closed of described first switch and disconnects.
Further, in described current filtering circuit, described first ON-OFF control circuit comprises the first comparator, the second comparator and rest-set flip-flop, wherein:
The positive input of described first comparator connects the drain electrode of described power switch pipe, and the reverse input end of described first comparator connects the first reference voltage, and the output of described first comparator connects the S end of described rest-set flip-flop;
The reverse input end of described second comparator connects the drain electrode of described power switch pipe, and the positive input of described second comparator connects the second reference voltage, and the output of described second comparator connects the R end of described rest-set flip-flop;
The output of described rest-set flip-flop connects described first switch, exports described first switch controlling signal to described first switch;
Described first reference voltage is greater than described second reference voltage.
Further, in described current filtering circuit, the voltage difference of described first reference voltage and described second reference voltage is less than or equal to 1V.
Further, in described current filtering circuit, described filter element comprises a filter capacitor and one second resistance, one end of described second resistance connects the source electrode of described power switch pipe, the other end of described second resistance connects described filtering compensation circuit, one end ground connection of described filter capacitor, the other end of described filter capacitor connects the other end of described second resistance, for described filtering compensation circuit provides described non-ripple signal.
Further, in described current filtering circuit, described first switch in parallel is in the two ends of described second resistance.
Further, in described current filtering circuit, described current filtering circuit also comprises protective circuit, and described protective circuit comprises:
Second switch, one end of described second switch connects the source electrode of described power switch pipe, and the other end connects the grid of described power switch pipe;
3rd comparator, the positive input of described 3rd comparator connects the drain electrode of described power switch pipe, the reverse input end of described 3rd comparator connects the 3rd reference voltage, and the output of described 3rd comparator exports a second switch control signal to described second switch.
Further, in described current filtering circuit, described filtering compensation circuit is error amplifier, the inverting input of described error amplifier connects the source electrode of described power switch pipe, to receive described ripple signal, the normal phase input end of described error amplifier connects described filter element, and to receive described non-ripple signal, the output of described error amplifier exports described compensating signal.
According to another side of the present invention, the present invention also provides a kind of supply convertor, described supply convertor comprises rectification circuit, filter capacitor and circuit for power conversion, described rectification circuit performs rectification process to interchange input, after described filter capacitor and described circuit for power conversion parallel connection, connect with described rectification circuit, output voltage is supplied to a load by described circuit for power conversion, described supply convertor also comprises the current filtering circuit as above described in any one, and described current filtering the regulation of electrical circuit flows through the ripple of electric current in described load.
Further, in described supply convertor, described circuit for power conversion comprises a transformer and a device for power switching, described transformer comprises armature winding and secondary winding, described armature winding connects described rectification circuit, and described secondary winding is used for output voltage, and described armature winding also connects described device for power switching, described supply convertor also comprises power factor correction constant-voltage control circuit, and described power factor correction constant-voltage control circuit connects the grid of device for power switching.
Compared with prior art, current filtering circuit provided by the invention and supply convertor have the following advantages:
In current filtering circuit provided by the invention, described current filtering circuit comprises power switch pipe, filter element, filtering compensation circuit, load described in the drain series of described power switch pipe, the source electrode of described power switch pipe exports a ripple signal, the drain electrode of described power switch pipe is connected by one first resistance with grid, described filter element receives described ripple signal, filtering process is carried out to described ripple signal, and export a non-ripple signal, described filtering compensation circuit receives described ripple signal and non-ripple signal respectively, after described ripple signal and non-ripple signal are compared, export a compensating signal, and described compensating signal is fed back to the grid of described power switch pipe, described compensating signal is by the drain voltage of power switch pipe described in described first resnstance transformer, when described non-ripple signal is greater than described ripple signal, the drain voltage of described compensating signal to described power switch pipe provides malleation to compensate, when described non-ripple signal is less than described ripple signal, the drain voltage of described compensating signal to described power switch pipe provides negative pressure compensating, thus can reduce or eliminate working frequency ripple wave, and this circuit configuration is simple, and cost is low.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of supply convertor in prior art;
Fig. 2 is the circuit diagram of current filtering circuit in one embodiment of the invention;
Fig. 3 is the circuit diagram of the first ON-OFF control circuit in one embodiment of the invention;
Fig. 4 is the circuit diagram of the 3rd comparator in one embodiment of the invention;
Fig. 5 is the circuit diagram of supply convertor in one embodiment of the invention.
Embodiment
Below in conjunction with schematic diagram, current filtering circuit of the present invention and supply convertor are described in more detail, which show the preferred embodiments of the present invention, should be appreciated that those skilled in the art can revise the present invention described here, and still realize advantageous effects of the present invention.Therefore, following description is appreciated that extensively knowing for those skilled in the art, and not as limitation of the present invention.
In order to clear, whole features of practical embodiments are not described.They in the following description, are not described in detail known function and structure, because can make the present invention chaotic due to unnecessary details.Will be understood that in the exploitation of any practical embodiments, a large amount of implementation detail must be made to realize the specific objective of developer, such as, according to regarding system or the restriction about business, change into another embodiment by an embodiment.In addition, will be understood that this development may be complicated and time-consuming, but be only routine work to those skilled in the art.
In the following passage, more specifically the present invention is described by way of example with reference to accompanying drawing.According to the following describes and claims, advantages and features of the invention will be clearer.It should be noted that, accompanying drawing all adopts the form that simplifies very much and all uses non-ratio accurately, only in order to object that is convenient, the aid illustration embodiment of the present invention lucidly.
Core concept of the present invention is, a kind of current filtering circuit is provided, for adjusting the ripple flowing through electric current in load, comprise power switch pipe, filter element, filtering compensation circuit, load described in the drain series of described power switch pipe, the source electrode of described power switch pipe exports a ripple signal, the drain electrode of described power switch pipe is connected by one first resistance with grid, described filter element receives described ripple signal, filtering process is carried out to described ripple signal, and export a non-ripple signal, described filtering compensation circuit receives described ripple signal and non-ripple signal respectively, after described ripple signal and non-ripple signal are compared, export a compensating signal, and described compensating signal is fed back to the grid of described power switch pipe, described compensating signal is by the drain voltage of power switch pipe described in described first resnstance transformer, when described non-ripple signal is greater than described ripple signal, the drain voltage of described compensating signal to described power switch pipe provides malleation to compensate, when described non-ripple signal is less than described ripple signal, the drain voltage of described compensating signal to described power switch pipe provides negative pressure compensating, thus can reduce or eliminate working frequency ripple wave, and this circuit configuration is simple, and cost is low.
Further, the present invention also provides a kind of supply convertor, described supply convertor comprises rectification circuit, filter capacitor and circuit for power conversion, described rectification circuit performs rectification process to interchange input, after described filter capacitor and described circuit for power conversion parallel connection, connect with described rectification circuit, output voltage is supplied to a load by described circuit for power conversion, described supply convertor also comprises described current filtering circuit, and described current filtering the regulation of electrical circuit flows through the ripple of electric current in described load.
Below illustrate detailed content of the present invention, please refer to Fig. 2, it is the circuit diagram of current filtering circuit in one embodiment of the invention.As shown in Figure 2, described current filtering circuit 2 adjustment flows through the ripple of electric current in load 110, and described current filtering circuit 2 comprises power switch pipe M2, filter element (comprising filter capacitor C3 and the second resistance R2 in the present embodiment) and filtering compensation circuit 111.
The drain D of described power switch pipe M2 is connected described load 110, and the source S of described power switch pipe M2 exports a ripple signal V1, and the drain D of described power switch pipe M2 is connected by one first resistance R1 with grid G.Wherein, in the present embodiment, described power switch pipe M2 is N-type transistor, but described power switch pipe M2 can also be NPN type triode or positive-negative-positive triode etc., as long as can realize the switching tube controlling the normal work of described current filtering circuit 2.General, the source S of described power switch pipe M2 also passes through one the 3rd resistance R3 ground connection, to ensure the voltage of the source S of described power switch pipe M2, but, the source S of described power switch pipe M2 is also passed through to connect other sectional pressure elements etc., also within thought range of the present invention.
Described filter element receives described ripple signal V1, carries out filtering process to described ripple signal V1, and exports a non-ripple signal V2.In the present embodiment, described filter element filter capacitor C3 and the second resistance R2, one end of described second resistance R2 connects the source S of described power switch pipe M2, the other end of described second resistance R2 connects described filtering compensation circuit 111, one end ground connection of described filter capacitor C3, the other end of described filter capacitor C3 connects the other end of described second resistance R2, for described filtering compensation circuit 111 provides described non-ripple signal V2.Described filter element is also for having the element of filter function, and this is what it will be appreciated by those skilled in the art that, does not enumerate at this.
Described filtering compensation circuit 111 receives described ripple signal V1 and non-ripple signal V2 respectively, after described ripple signal V1 and non-ripple signal V2 is compared, export a compensating signal i, and described compensating signal i is fed back to the grid G of described power switch pipe M2.Preferably, described filtering compensation circuit 111 is error amplifier G, the inverting input of described error amplifier G connects the drain D of described power switch pipe M2, to receive described ripple signal V1, the normal phase input end of described error amplifier G connects described filter element, to receive described non-ripple signal V2, the output of described error amplifier G exports described compensating signal i.In other embodiments of the invention, described filtering compensation circuit 111 can also be other structure, as long as described ripple signal V1 and non-ripple signal V2 can be compared and obtains described compensating signal i, within thought range of the present invention.
Due to when described current filtering circuit 2 starts, described non-ripple signal V2 rises slow, so, the drain-to-gate voltage U of described power switch pipe M2
gSrise slow, cause the drain voltage VD of described power switch pipe M2 to increase too fast.So, too fast in order to prevent the drain voltage VD of described power switch pipe M2 from increasing, preferably, described current filtering circuit 2 also comprises vibration start-up circuit 120, as shown in Figure 2, described vibration start-up circuit 120 comprises: the first switch Q1, the first ON-OFF control circuit 121, described first switch Q1 is parallel to the two ends of described second resistance R2, make one end of described first switch Q1 connect the source S of described power switch pipe M2, the other end of described first switch Q1 connects described filtering compensation circuit 111; Described first ON-OFF control circuit 121 connects the drain D of described power switch pipe M2, by judging the drain voltage VD of described power switch pipe M2, export one first switch controlling signal VQ1, described first switch controlling signal VQ1 is for controlling the closed of described first switch Q1 and disconnecting.
Preferably, described first ON-OFF control circuit 121 comprises the first comparator A1, the second comparator A2 and rest-set flip-flop RS, as shown in Figure 3.Wherein, the positive input of described first comparator A1 connects the drain D of described power switch pipe M2, the reverse input end of described first comparator A1 connects the first reference voltage Vref 1, and the output of described first comparator A1 connects the S end of described rest-set flip-flop RS; The reverse input end of described second comparator A2 connects the drain D of described power switch pipe M2, and the positive input of described second comparator A2 connects the second reference voltage Vref 2, and the output of described second comparator A2 connects the R end of described rest-set flip-flop RS; The output of described rest-set flip-flop RS connects described first switch Q1, exports described first switch controlling signal VQ1 to described first switch Q1.Described first reference voltage Vref 1 is greater than described second reference voltage Vref 2.Preferably, the voltage difference △ V≤1V of described first reference voltage Vref 1 and described second reference voltage Vref 2, preferably, △ V is 0.2V, 0.5V, 0.8V etc.
When described current filtering circuit 2 starts, when the drain voltage VD of described power switch pipe M2 rises to described first reference voltage Vref 1, described first ON-OFF control circuit 121 controls described first switch Q1 and closes, the drain-to-gate voltage U of described power switch pipe M2
gSrise, the drain voltage VD of described power switch pipe M2 declines gradually; When the drain voltage VD of described power switch pipe M2 is down to described second reference voltage Vref 2, described first ON-OFF control circuit 121 controls described first switch Q1 and disconnects, thus realizes vibration startup, serves the effect of buffering.Until described current filtering circuit 2 stable after, described first switch Q1 disconnects.
Preferably, described current filtering circuit 2 also comprises protective circuit 130, and as shown in Figure 2, described protective circuit 130 comprises: second switch Q2, the 3rd comparator 131.One end of described second switch Q2 connects the source S of described power switch pipe M2, and the other end connects the grid G of described power switch pipe M2; As shown in Figure 4, the positive input of described 3rd comparator A3 connects the drain D of described power switch pipe M2, the reverse input end of described 3rd comparator A3 connects the 3rd reference voltage Vref 3, and the output of described 3rd comparator A3 exports a second switch control signal VQ2 to described second switch Q3.
When described current filtering circuit 2 is short-circuited, electrolytic energy is added on described power switch pipe M2, when described 3rd comparator 131 detects that the drain voltage VD of described power switch pipe M2 is greater than described 3rd reference voltage Vref 3, control closed described second switch Q2, by the drain-to-gate voltage U of described power switch pipe M2
gSon tele-release fall, thus serve protective effect.
Described current filtering circuit 2 in the present invention can be applied to supply convertor, as shown in Figure 5.In Figure 5, identical reference number represents the label be equal in Fig. 1, Fig. 2.
As shown in Figure 5, described supply convertor 3 comprises rectification circuit 101, filter capacitor C
in, and circuit for power conversion 10, described rectification circuit 101 is used for performing rectification process to the AC-input voltage of alternating current input power supplying AC.Described filter capacitor C
inconnect described rectification circuit 101, described filter capacitor C
inperform filtering process on the one hand, on the other hand, when alternating current input power supplying AC is under-voltage, supply energy to circuit for power conversion 10.Filter capacitor C
inbe connected in parallel with circuit for power conversion 10, through the conversion of circuit for power conversion 10, the input voltage V of described supply convertor 1
in(AC-input voltage) is converted into output voltage V
out(VD), and by output voltage V
outbe supplied to LED even load.
In the present embodiment, described circuit for power conversion 10 is flyback power level circuit, and it includes an a transformer T and device for power switching M1, and described transformer T comprises armature winding N
pwith secondary winding N
s, described armature winding N
paccess input voltage V
in, and by induction of signal to secondary winding N
s, described secondary winding N
sthe voltage signal sensed is transferred to the first electric capacity C1, after the first electric capacity C1 filtering process, produces VD V
out.Armature winding N
palso connecting device for power switching M1, by controlling the break-make of device for power switching 125, controlling the work of described circuit for power conversion 10.
Preferably, described supply convertor 3 also comprises PFC (power factor correction) constant-voltage control circuit 102, PFC constant-voltage control circuit 102 connects the grid of device for power switching M1, controls the voltage with ripple of described circuit for power conversion 10 stable output.
In the present embodiment, the described current filtering circuit 2 of the present embodiment in use, need first to be energized to described load 110, the signal of telecommunication (having ripple) is passed to the drain D of described power switch pipe M2 by described load 110 by the drain D of described power switch pipe M2.Described ripple signal V1 is exported to described error amplifier G by the source S of described power switch pipe M2.Meanwhile, described filter element C3 carries out filtering process to described ripple signal V1, and exports described non-ripple signal V2.
Described error amplifier G compares described ripple signal V1 and non-ripple signal V2, and produces a compensating signal i, and described compensating signal i passes to the drain D of described power switch pipe M2 by described first resistance R1.Wherein, i=(V2-V1) × Gm, Gm is the gain amplifier parameter of described error amplifier G.If V2 > is V1, described compensating signal i is just, the drain voltage VD of described compensating signal i to described power switch pipe M2 provides malleation to compensate, and increases the drain voltage VD of described power switch pipe M2; If V2 < is V1, described compensating signal i is negative, then toward pumpback electricity, described compensating signal i the drain voltage VD to described power switch pipe M2 provide negative pressure compensating, reduces the drain voltage VD of described power switch pipe M2.Thus described compensating signal i forms the drain voltage VD that pressure drop (forward or negative sense) compensates described power switch pipe M2 on described first resistance R1, thus can reduce or eliminate working frequency ripple wave.When loop balance, the electric current I on R1
r1=U
gD/ R=(V2-V1) × Gm=I' .... (1)
Wherein, R is the resistance of described first resistance R1, U
gDfor the drain-to-gate voltage of described power switch pipe M2, mean value when I' is loop balance in the described compensating signal i unit interval.
As can be seen from (1) formula, R=U
gD/ [(V2-V1) × Gm], U
gDsize specifically determined by described circuit for power conversion 10, Gm is fixed value.
Preferably, the resistance R>=U of described first resistance R1
gD/ Gi, wherein Gi is that described the maximum of error amplifier G bears electric current, is conducive to ensureing that described error amplifier G can normally work.
In sum, compared with prior art, the present invention has the following advantages for current filtering circuit provided by the invention and supply convertor:
In current filtering circuit provided by the invention, described current filtering circuit comprises power switch pipe, filter element, filtering compensation circuit, load described in the drain series of described power switch pipe, the source electrode of described power switch pipe exports a ripple signal, the drain electrode of described power switch pipe is connected by one first resistance with grid, described filter element receives described ripple signal, filtering process is carried out to described ripple signal, and export a non-ripple signal, described filtering compensation circuit receives described ripple signal and non-ripple signal respectively, after described ripple signal and non-ripple signal are compared, export a compensating signal, and described compensating signal is fed back to the grid of described power switch pipe, described compensating signal is by the drain voltage of power switch pipe described in described first resnstance transformer, when described non-ripple signal is greater than described ripple signal, the drain voltage of described compensating signal to described power switch pipe provides malleation to compensate, when described non-ripple signal is less than described ripple signal, the drain voltage of described compensating signal to described power switch pipe provides negative pressure compensating, thus can reduce or eliminate working frequency ripple wave, and this circuit configuration is simple, and cost is low.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (10)
1. a current filtering circuit, for adjusting the ripple flowing through electric current in load, is characterized in that, described current filtering circuit comprises:
Power switch pipe, load described in the drain series of described power switch pipe, the source electrode of described power switch pipe exports a ripple signal, and the drain electrode of described power switch pipe is connected by one first resistance with grid;
Filter element, described filter element receives described ripple signal, carries out filtering process to described ripple signal, and exports a non-ripple signal;
Filtering compensation circuit, described filtering compensation circuit receives described ripple signal and non-ripple signal respectively, after described ripple signal and non-ripple signal being compared, exports a compensating signal, and described compensating signal is fed back to the grid of described power switch pipe;
Described compensating signal is by the drain voltage of power switch pipe described in described first resnstance transformer, and when described non-ripple signal is greater than described ripple signal, the drain voltage of described compensating signal to described power switch pipe provides malleation to compensate; When described non-ripple signal is less than described ripple signal, the drain voltage of described compensating signal to described power switch pipe provides negative pressure compensating.
2. current filtering circuit as claimed in claim 1, it is characterized in that, described current filtering circuit also comprises vibration start-up circuit, and described vibration start-up circuit comprises:
First switch, one end of described first switch connects the source electrode of described power switch pipe, and the other end of described first switch connects described filtering compensation circuit;
First ON-OFF control circuit, described first ON-OFF control circuit connects the drain electrode of described power switch pipe, by judging the drain voltage of described power switch pipe, export one first switch controlling signal, described first switch controlling signal controls the closed of described first switch and disconnects.
3. current filtering circuit as claimed in claim 2, it is characterized in that, described first ON-OFF control circuit comprises the first comparator, the second comparator and rest-set flip-flop, wherein:
The positive input of described first comparator connects the drain electrode of described power switch pipe, and the reverse input end of described first comparator connects the first reference voltage, and the output of described first comparator connects the S end of described rest-set flip-flop;
The reverse input end of described second comparator connects the drain electrode of described power switch pipe, and the positive input of described second comparator connects the second reference voltage, and the output of described second comparator connects the R end of described rest-set flip-flop;
The output of described rest-set flip-flop connects described first switch, exports described first switch controlling signal to described first switch;
Described first reference voltage is greater than described second reference voltage.
4. current filtering circuit as claimed in claim 3, it is characterized in that, the voltage difference of described first reference voltage and described second reference voltage is less than or equal to 1V.
5. current filtering circuit as claimed in claim 2, it is characterized in that, described filter element comprises a filter capacitor and one second resistance, one end of described second resistance connects the source electrode of described power switch pipe, the other end of described second resistance connects described filtering compensation circuit, one end ground connection of described filter capacitor, the other end of described filter capacitor connects the other end of described second resistance, for described filtering compensation circuit provides described non-ripple signal.
6. current filtering circuit as claimed in claim 5, it is characterized in that, described first switch in parallel is in the two ends of described second resistance.
7. as the current filtering circuit in claim 1-6 as described in any one, it is characterized in that, described current filtering circuit also comprises protective circuit, and described protective circuit comprises:
Second switch, one end of described second switch connects the source electrode of described power switch pipe, and the other end connects the grid of described power switch pipe;
3rd comparator, the positive input of described 3rd comparator connects the drain electrode of described power switch pipe, the reverse input end of described 3rd comparator connects the 3rd reference voltage, and the output of described 3rd comparator exports a second switch control signal to described second switch.
8. current filtering circuit as claimed in claim 1, it is characterized in that, described filtering compensation circuit is error amplifier, the inverting input of described error amplifier connects the source electrode of described power switch pipe, to receive described ripple signal, the normal phase input end of described error amplifier connects described filter element, and to receive described non-ripple signal, the output of described error amplifier exports described compensating signal.
9. a supply convertor, it is characterized in that, described supply convertor comprises rectification circuit, filter capacitor and circuit for power conversion, described rectification circuit performs rectification process to interchange input, after described filter capacitor and described circuit for power conversion parallel connection, connect with described rectification circuit, output voltage is supplied to a load by described circuit for power conversion, described supply convertor also comprises as the current filtering circuit in claim 1-8 as described in any one, and described current filtering the regulation of electrical circuit flows through the ripple of electric current in described load.
10. supply convertor as claimed in claim 9, it is characterized in that, described circuit for power conversion comprises a transformer and a device for power switching, described transformer comprises armature winding and secondary winding, described armature winding connects described rectification circuit, described secondary winding is used for output voltage, described armature winding also connects described device for power switching, described supply convertor also comprises power factor correction constant-voltage control circuit, and described power factor correction constant-voltage control circuit connects the grid of device for power switching.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410099954.2A CN103840647B (en) | 2014-03-18 | 2014-03-18 | Current filtering circuit and supply convertor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410099954.2A CN103840647B (en) | 2014-03-18 | 2014-03-18 | Current filtering circuit and supply convertor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103840647A CN103840647A (en) | 2014-06-04 |
| CN103840647B true CN103840647B (en) | 2016-02-17 |
Family
ID=50803869
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410099954.2A Active CN103840647B (en) | 2014-03-18 | 2014-03-18 | Current filtering circuit and supply convertor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103840647B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102015208078A1 (en) * | 2015-04-30 | 2016-11-03 | Osram Gmbh | Circuit arrangement and method for reducing the light modulation of at least one voltage source operated at a voltage |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3690584B2 (en) * | 2000-09-13 | 2005-08-31 | 株式会社東芝 | Control device for DC reactor |
| JP2006094682A (en) * | 2004-09-27 | 2006-04-06 | Toshiba Mitsubishi-Electric Industrial System Corp | Power supply device |
| EP1962413A1 (en) * | 2007-02-22 | 2008-08-27 | Stmicroelectronics SA | Ripple compensator and switching converter comprising such a ripple compensator |
| CN102843039B (en) * | 2012-09-18 | 2014-11-26 | 英飞特电子（杭州）股份有限公司 | Control circuit and constant current source circuit with same |
| CN103281838B (en) * | 2013-06-05 | 2015-11-25 | 矽力杰半导体技术(杭州)有限公司 | A kind of circuit, method and LED drive circuit eliminating LED stroboscopic |
-
2014
- 2014-03-18 CN CN201410099954.2A patent/CN103840647B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN103840647A (en) | 2014-06-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| TWI492483B (en) | Step - up battery charge management system and its control method | |
| US11239708B2 (en) | In-band communication during wireless battery charging | |
| JP3198222U (en) | Charger and charging system | |
| CN104423407B (en) | Low pressure difference linear voltage regulator and starting method thereof, electronic installation and chip | |
| CN102263515B (en) | AC-DC (alternating current-direct current) power conversion chip and power conversion circuit | |
| JP6511042B2 (en) | Battery charger for electric vehicles including PFC circuit | |
| US10250151B1 (en) | Flyback converter controlled from secondary side | |
| CN204190621U (en) | A kind of switching power circuit | |
| CN103178706B (en) | Power module and distributed power supply device with same | |
| US20140063868A1 (en) | Power supply apparatus with power factor correction and pulse width modulation mechanism and method thereof | |
| CN111509825A (en) | 45W broadband voltage self-adaptation PPS super portable power source structure that fills soon | |
| CN204906189U (en) | Low pressure high frequency switching power supply circuit | |
| CN108964466A (en) | Power source converter and method for operating power source converter | |
| CN103532394A (en) | Continuously adjustable intelligent power module | |
| CN105720647A (en) | Power adapter with multiple charging modes | |
| CN205544520U (en) | Automatic energy -conserving charging circuit of pressure regulating | |
| WO2020010969A1 (en) | Rectifier circuit, wireless charging apparatus, power supply device, and wireless charging system | |
| CN104219855A (en) | Strobe-free LED constant-flow drive control circuit based on APFC | |
| CN104124862A (en) | High-PFC constant current control device without loop compensation and voltage converter | |
| CN103840647B (en) | Current filtering circuit and supply convertor | |
| CN112803794A (en) | Power adapter, power supply system and power supply method | |
| CN104426220A (en) | Voltage regulation circuit | |
| CN208986675U (en) | UPS device | |
| CN203826932U (en) | UPS inverter bridge over-current protection and charging over-current protection multiplexing circuit | |
| CN207623823U (en) | A kind of DC-stabilized circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |