CN108667285A - Adjust the control circuit and Switching Power Supply of switching frequency and load current relationship - Google Patents
Adjust the control circuit and Switching Power Supply of switching frequency and load current relationship Download PDFInfo
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- CN108667285A CN108667285A CN201810373086.0A CN201810373086A CN108667285A CN 108667285 A CN108667285 A CN 108667285A CN 201810373086 A CN201810373086 A CN 201810373086A CN 108667285 A CN108667285 A CN 108667285A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/34—Snubber circuits
Abstract
The present invention relates to the control circuits and Switching Power Supply of adjustment switching frequency and load current relationship, including：Main control chip；Load current detection circuit is connect with main control chip, and the secondary current feedback signal detection load current and output load current obtained based on main control chip detects voltage；Voltage operational circuit, connect with load current detection circuit, receives load current detection voltage, and error op enhanced processing, output adjustment voltage are carried out to load current detection voltage；Reference voltage generating circuit, it is connect respectively with voltage operational circuit and main control chip, receive adjustment voltage, reference voltage is generated according to adjustment voltage and is exported to main control chip, the transformer peak point current for adjusting power supply based on reference voltage by main control chip makes the switching frequency of power supply form non-linear relation with load current by the feedback effect of power-supply system.The present invention can make switching frequency form non-linear relation with load current, improve the dynamic response characteristic of system.
Description
Technical field
The present invention relates to field of switch power, more specifically to a kind of adjustment switching frequency and load current relationship
Control circuit and Switching Power Supply.
Background technology
With the explosive growth of the portable equipment of built-in rechargeable battery, the demand to small-power AC/DC chargers is not yet
It is disconnected to increase, it is more and more harsher to its cost requirement.The AC/DC control technologies of primary side feedback mode are exactly to develop in this background
Get up, add compared with the structure of TL431 with the optocoupler of traditional secondary side feedback, maximum advantage is to eliminate the two
Device and matched one group of component, which offers a saving the spaces on system board, reduce cost and improve
The controllability of system.In the city very high to volume requirement such as the larger market of the cost pressures such as phone charger and LED drivings
Field has broad application prospects.
In existing primary side feedback system, switching frequency is linear relationship with output current.With subtracting for output current
Small, working frequency linearly reduces；When output current is reduced to 1/3 or less constant current value, system operating frequency will be less than
20KHz makes an uproar within human auditory's frequency range so this system will produce apparent abnormal sound in light load output
Sound.In addition, this primary side feedback mode controls chip can only can just detect output voltage, chip when secondary side diode is connected
The variation of output voltage cannot be monitored in real time；During fly-wheel diode ends, control chip can not detect the change of output voltage
Change, so suitable adjustment is made in the variation that can not be directed to output voltage, therefore, the underloading in load current very little or zero load
In the case of, switching frequency will be very low, and then causes dynamic load characteristics poor.
Invention content
The technical problem to be solved in the present invention is, for the drawbacks described above of the prior art, provides a kind of adjustment switch frequency
The control circuit and Switching Power Supply of rate and load current relationship.
The technical solution adopted by the present invention to solve the technical problems is：Construct a kind of adjustment switching frequency and load current
The control circuit of relationship, including：
Main control chip；
Load current detection circuit is connect with the main control chip, and the secondary current obtained based on the main control chip is anti-
Feedback signal detects load current and output load current detects voltage；
Voltage operational circuit is connect with the load current detection circuit, the load current detection voltage is received, to institute
It states load current detection voltage and carries out error op enhanced processing, output adjustment voltage；
Reference voltage generating circuit is connect with the voltage operational circuit and main control chip respectively, receives the adjustment electricity
Pressure generates reference voltage according to the adjustment voltage and exports to the main control chip, the base is based on by the main control chip
The transformer peak point current of quasi- voltage adjustment power supply makes the switching frequency and load electricity of power supply by the feedback effect of power-supply system
Stream forms non-linear relation.
Preferably, the main control chip includes reference voltage receiving terminal, comparison module, control module, drive module, driving
Signal output end and secondary current feedback signal receiving terminal；Wherein,
The reference voltage receiving terminal is connected to the input terminal of comparison module, and the secondary current feedback signal receives termination
Receive the secondary current feedback signal；
The comparison module is compared judgement based on the reference voltage that the reference voltage receiving terminal is received, and exports
Comparison signal is to control module；The control module controls drive module output drive signal to adjust according to the comparison signal
The transformer peak point current of power supply adjusts switching frequency in turn.
Preferably, the drive signal is PWM drive signal.
Preferably, the load current detection circuit include first switch, second switch, phase inverter and filter resistance and
Filter capacitor；
The first switch and the second switch includes three pins, wherein the first pin of the first switch and institute
State phase inverter input terminal connection, and the node of the input terminal of the first pin and phase inverter of the first switch also with the master
The secondary current feedback signal receiving terminal connection of chip is controlled, the second pin of the first switch generates electricity with the reference voltage
Road connects, and the third pin of the first switch is connect with the first end of the filter resistance；
First pin of the second switch is connect with the output end of the phase inverter, the second pin of the second switch
It is connect with the third pin of the first switch；The second end of the filter resistance is connect with the first end of the filter capacitor,
The second end of the filter capacitor is connect with the third pin of the second switch, and the second end of the filter resistance with it is described
The connecting node of the third pin of second switch is load current detection voltage output end, is connected with the voltage operational circuit
It connects.
Preferably, the first switch and the second switch is metal-oxide-semiconductor.
Preferably, the voltage operational circuit includes：
Error amplifier, metal-oxide-semiconductor M1, first resistor, second resistance, 3rd resistor and the 4th resistance；
The second end of first termination reference voltage of the first resistor, the first resistor passes sequentially through second electricity
Resistance, 3rd resistor and the 4th resistance eutral grounding；
The first end of the second end and filter capacitor of the inverting input of the error amplifier and the filter resistance
Connecting node, the in-phase input end of the error amplifier are connect with the connecting node of the 3rd resistor and the 4th resistance, institute
The output end for stating error amplifier is connect with the grid of the metal-oxide-semiconductor M1；
The drain electrode of the metal-oxide-semiconductor M1 is connect with the connecting node of the second resistance and 3rd resistor, the metal-oxide-semiconductor M1's
Source electrode is connect with the second end of the filter capacitor, and the source electrode of the metal-oxide-semiconductor M1 is connect with the second end of the filter capacitor
Node be additionally coupled to the reference voltage generating circuit；
Connecting node between the first resistor and second resistance is adjustment voltage output end, with the reference voltage
Generation circuit connects.
Preferably, the reference voltage generating circuit includes：Receiving circuit, the 5th resistance and the 6th resistance；
Node connection between the first end of the receiving circuit and the first resistor and second resistance, the reception electricity
The second end on road is connect with the first end of the 5th resistance, the second end of the 5th resistance and the first of the 6th resistance
End connection, the section that the second end of the 6th resistance is connect with the second end of the source electrode of the metal-oxide-semiconductor M1 and the filter capacitor
Point connection；Node between 5th resistance and the 6th resistance is additionally coupled to the reference voltage receiving terminal of the main control chip；
Node voltage between 5th resistance and the 6th resistance is the reference voltage.
Preferably, the receiving circuit is buffer, and the buffer is the buffer that high resistant inputs low-resistance output.
Preferably, the control circuit further includes power switch, the control terminal of the power switch and the main control chip
Connection, the on off state of the power switch is controlled to adjust the switching frequency of power supply by the main control chip.
The present invention also provides a kind of Switching Power Supplies, include the control electricity of above-mentioned adjustment switching frequency and load current relationship
Road.
The control circuit for implementing the adjustment switching frequency and load current relationship of the present invention, has the advantages that：This
Invention passes through the peak point current for the size dynamic regulation primary side transformer for detecting load current, so that switching frequency is with load
Electric current forms a non-sheerly relationship, when load current, which is reduced to working frequency, enters human hearing range, due to peak value electricity
Flow it is sufficiently small, transformer generate abnormal sound will be substantially reduced, simultaneously because the reduction of peak point current, idling frequency are carried
Height improves the dynamic response characteristic of system.
Description of the drawings
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing：
Fig. 1 is the logical construction of adjustment switching frequency and the control circuit of load current relationship provided in an embodiment of the present invention
Schematic diagram；
Fig. 2 is the circuit theory of adjustment switching frequency and the control circuit of load current relationship provided in an embodiment of the present invention
Figure；
Fig. 3 is the relational graph of the pulse-period signal and secondary inductor current of implementing the control circuit of the present invention；
Fig. 4 is the peak point current of transformer of the present invention and the relation schematic diagram of load current；
Fig. 5 is that the switching frequency of the power-supply system of the control circuit of the embodiment present invention and the relationship of load current are illustrated
Figure.
Specific implementation mode
Abnormal sound problem is lightly loaded present in existing design in order to reduce, to improve power-supply system dynamic response domestic animal, the present invention
A kind of control circuit of adjustment switching frequency and load current relationship is constructed, the control circuit is by detecting the big of load current
It is small, with the peak point current of dynamic regulation primary side transformer, to make switching frequency form a non-linear relation with load current,
When load current, which is reduced to working frequency, enters human hearing range, since peak point current is sufficiently small, transformer generates
Abnormal sound will be substantially reduced, simultaneously as the reduction of peak point current, idling frequency are improved, improve power-supply system
Dynamic response characteristic.As shown in Figure 1 to Figure 2, it is the control circuit for adjusting switching frequency and load current relationship of the present invention
Realization circuit.
Specifically, Fig. 1 is the control circuit of adjustment switching frequency and load current relationship provided in an embodiment of the present invention
Logical construction schematic diagram, the control circuit include main control chip 10, load current detection circuit 20, voltage operational circuit 30 and
Reference voltage generating circuit 40.Wherein, main control chip 10, load current detection circuit 20, voltage operational circuit 30 and benchmark
Voltage generation circuit 40 is sequentially connected, and reference voltage generating circuit 40 is also connect with main control chip 10.Main control chip 10 is used for
Secondary current feedback signal is obtained, while the secondary current feedback signal is sent to load current detection circuit 20, load electricity
The secondary current feedback signal detection load current simultaneously output load current inspection that current detection circuit 20 is obtained based on main control chip 10
Voltage is surveyed, voltage operational circuit 30 receives the load current detection electricity that load current detection circuit 20 generates and to load current
It detects voltage and carries out error op enhanced processing, final output adjusts voltage；Reference voltage generating circuit 40 receives adjustment electricity
Pressure generates reference voltage according to adjustment voltage and exports to main control chip 10, and reference voltage adjustment electricity is based on by main control chip 10
The transformer peak point current in source makes the switching frequency of power supply be formed with load current non-linear by the feedback effect of power-supply system
Relationship.
A little it should be noted that the feedback effect of power-supply system refers to the negative-feedback of power-supply system, i.e., when primary side peak
When being worth electric current reduction, power-supply system can be automatically increased working frequency to keep output power；Similarly, when primary side peak point current
When increase, power-supply system can improve working frequency automatically to maintain output power.
Main control chip 10 specifically may include reference voltage receiving terminal, comparison module, control module, drive module, driving letter
Number output end and secondary current feedback signal receiving terminal；Wherein, reference voltage receiving terminal is connected to the input terminal of comparison module,
Secondary current feedback signal receiving terminal receives secondary current feedback signal；Comparison module is received based on reference voltage receiving terminal
Reference voltage is compared judgement, and exports comparison signal to control module；Control module controls driving mould according to comparison signal
Block output drive signal is to adjust the transformer peak point current of power supply and then adjust switching frequency.
Further, the drive signal of drive module output is PWM drive signal, by the PWM drive signal to adjust
The peak point current of transformer primary side is finally reached the purpose of adjustment switches of power system frequency.
As shown in Fig. 2, load current detection circuit 20 specifically may include first switch, second switch, phase inverter and filter
Wave resistance and filter capacitor.Wherein, first switch and the second switch includes three pins, wherein the first of first switch is drawn
The input terminal of foot and phase inverter connect, and the node of the input terminal of the first pin and phase inverter of first switch also with main control chip
10 secondary current feedback signal receiving terminal connection, the second pin of first switch are connect with reference voltage generating circuit 40, the
The third pin of one switch and the first end of filter resistance connect；First pin of second switch and the output end of phase inverter connect
It connects, the second pin of second switch and the third pin of first switch connect；The second end of filter resistance and the of filter capacitor
One end connects, and the second end of filter capacitor and the third pin of second switch connect, and the second end of filter resistance is opened with second
The connecting node of the third pin of pass is load current detection voltage output end, is connect with voltage operational circuit 30.
Optionally, the first switch and the second switch of the embodiment of the present invention is metal-oxide-semiconductor.
As shown in Fig. 2, the secondary current feedback signal (V accessedTons) it is low and high level signal, when the secondary side of access electricity
When stream feedback signal is high level, first switch (K1) conducting, when the secondary current feedback signal of access is low level, this
When, first switch (K1) cut-off, and second switch (K2) is due to the inverting function of phase inverter, what control terminal was accessed is high electricity
It is flat, so second switch (K2) is connected.
As shown in Fig. 2, voltage operational circuit 30 specifically may include：Error amplifier, metal-oxide-semiconductor M1, first resistor, the second electricity
Resistance, 3rd resistor and the 4th resistance.
Wherein, the first termination reference voltage of first resistor, the second end of first resistor pass sequentially through second resistance, third
Resistance and the 4th resistance eutral grounding；The first of the inverting input of error amplifier and the second end of filter resistance and filter capacitor
The in-phase input end of the connecting node at end, error amplifier is connect with the connecting node of 3rd resistor and the 4th resistance, and error is put
The output end of big device is connect with the grid of metal-oxide-semiconductor M1；The drain electrode of metal-oxide-semiconductor M1 connects with the connecting node of second resistance and 3rd resistor
It connects, the source electrode of metal-oxide-semiconductor M1 and the second end of filter capacitor connect, and the second end of the source electrode of metal-oxide-semiconductor M1 and filter capacitor connects
Node be additionally coupled to reference voltage generating circuit 40；Connecting node between first resistor and second resistance is that adjustment voltage is defeated
Outlet is connect with reference voltage generating circuit 40.
Reference voltage generating circuit 40 specifically may include：Receiving circuit, the 5th resistance and the 6th resistance.
Between the first end and first resistor and second resistance of receiving circuit node connection, the second end of receiving circuit with
The first end of 5th resistance connects, and the second end of the 5th resistance is connect with the first end of the 6th resistance, the second end of the 6th resistance
The node connection being connect with the second end of the source electrode of metal-oxide-semiconductor M1 and filter capacitor；Node between 5th resistance and the 6th resistance
It is additionally coupled to the reference voltage receiving terminal of main control chip 10；It is electric on the basis of node voltage between 5th resistance and the 6th resistance
Pressure.
The receiving circuit of the embodiment of the present invention can be buffer, it is alternatively that, which is that high resistant input low-resistance is defeated
The buffer gone out.By the way that the buffer is arranged, the increase of the node voltage between first resistor and second resistance can be exported, with
Convenient for the reception and detection of late-class circuit.
The adjustment switching frequency of the embodiment of the present invention and the control circuit of load current relationship further include power switch, the work(
The control terminal of rate switch is connect with main control chip 10, and the on off state of power switch is controlled to adjust power supply by main control chip 10
Transformer peak point current, and then adjust the switching frequency of power supply.
In fig. 2, VTonsPulse-period signal, the pulse-period signal are the pair acquired in main control chip 10 above-mentioned
Side current feedback signal, which is secondary inductance turn-on time, and frequency is opened with power-supply system
Pass frequency is identical, and waveform is as shown in Figure 3.Wherein, IpFor the electric current on transformer primary side inductance, IsFor transformer secondary inductance
On electric current.
When the suitable cutoff frequency of low-pass filtering is sufficiently low, under stable state, the output of load current detection module is average electric
Press VfFor：
Wherein, TonsFor secondary inductance discharge time, TsFor system duty cycle, V2For the electricity exported after buffer
Pressure.
It can be obtained by the calculation process of voltage operational circuit 30：
The V that voltage operational circuit 30 exports1Input reference voltage generation circuit 40, and reference voltage generating circuit 40 is by delaying
Device and the 5th resistance R5 and the 6th resistance R6 compositions are rushed, and by can be seen that in Fig. 2：V2=V1 (3 formula), and
Wherein, Vcs_thThe reference voltage that as reference voltage generating circuit 40 generates, the reference voltage is as adjustment power supply
Transformer peak point current reference voltage.
It can be obtained by the above calculations incorporated 1-4 formulas：
Wherein
By Io=Tons*Ipks/2/Ts(IpksFor the peak point current of secondary inductance；IoFor under stable state, by flowing through afterflow
The secondary inductor current I of diode D1oThe obtained output average current of waveform, i.e., load current mentioned herein) obtain：
Wherein,NpFor the number of turns of transformer primary side inductance, NsFor the number of turns of transformer secondary inductance.
6 substitution formula 5 of wushu obtains：
The I it can be seen from formula 8pk(peak point current of transformer primary side) is with IoThe reduction of (load current) and reduce, because
This, appropriate selection parameter a, b, c and VrefNumerical value, you can obtain suitable switching frequency and load current relation curve.Such as figure
Shown in 4, pass through selection parameter a, b, c and VrefDifferent numerical value, can get the peak point current and load current of transformer primary side
Graph of relation.
Particularly, if selection Vref=3.3V, R1=1.2K Ω, R2=1K Ω, R3=5K Ω, R4=6K Ω, R5=5K
Ω, R6=1K Ω are obtained：
Under constant current mode, output current IoReach maximum value, the peak point current I of transformer primary sidepkAlso reach maximum value
Ipk_max, i.e.,：
In addition, being obtained by analysis before：
Association type 11 and formula 12 obtain：
Wherein IccmFor constant current output value；
Wherein RsFor current sense resistor.
Particularly, as K0=0.5,
Work as Io=0, Ipk(0)=0.25/Rcs, works as Io=ICCMWhen, Ipk_max=0.5/Rcs. (16 formula)；
Since power-supply system works in discontinuous mode (DCM), set all devices are ideal component, constant pressure
Power-supply system working frequency f is under pattern：
Vo_setFor constant pressure value；
LpFor transformer primary side inductance sensibility reciprocal；
Formula 18 divided by formula 17 are obtained：
Formula 15 and formula 16 are substituted into above formula and obtain the switching frequency of power supply and the relational expression of load current：
It can be seen that the switching frequency of power supply and load current are non-linear relation, specific curve graph such as Fig. 5 by the formula
It is shown.
A kind of Switching Power Supply has also been constructed in the present invention, which can be arranged above-mentioned adjustment switching frequency and load current
The control circuit of relationship can solve the problems, such as underloading abnormal sound existing for power supply in existing setting by the way that above-mentioned control circuit is arranged,
Improve the dynamic response characteristic of power supply.
Above example only technical concepts and features to illustrate the invention, its object is to allow person skilled in the art
Scholar can understand present disclosure and implement accordingly, can not limit the scope of the invention.It is all to be wanted with right of the present invention
The equivalent changes and modifications that range is done are sought, the covering scope of the claims in the present invention should all be belonged to.
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 appended claims of the present invention.
Claims (10)
1. a kind of control circuit of adjustment switching frequency and load current relationship, which is characterized in that including：
Main control chip；
Load current detection circuit is connect with the main control chip, the secondary current feedback letter obtained based on the main control chip
Number detection load current and output load current detect voltage；
Voltage operational circuit is connect with the load current detection circuit, receives the load current detection voltage, to described negative
It carries current detection voltage and carries out error op enhanced processing, output adjustment voltage；
Reference voltage generating circuit is connect with the voltage operational circuit and main control chip respectively, receives the adjustment voltage, root
Reference voltage is generated according to the adjustment voltage and is exported to the main control chip, and the reference voltage is based on by the main control chip
The transformer peak point current for adjusting power supply, makes the switching frequency of power supply be formed with load current by the feedback effect of power-supply system
Non-linear relation.
2. the control circuit of adjustment switching frequency and load current relationship according to claim 1, which is characterized in that described
Main control chip includes reference voltage receiving terminal, comparison module, control module, drive module, driving signal output end and secondary side
Current feedback signal receiving terminal；Wherein,
The reference voltage receiving terminal is connected to the input terminal of the comparison module, and the secondary current feedback signal receives termination
Receive the secondary current feedback signal；
The comparison module is compared judgement based on the reference voltage that the reference voltage receiving terminal is received, and exports and compare
Signal is to control module；The control module controls drive module output drive signal to adjust power supply according to the comparison signal
Transformer peak point current so that adjust switching frequency.
3. the control circuit of adjustment switching frequency and load current relationship according to claim 2, which is characterized in that described
Drive signal is PWM drive signal.
4. the control circuit of adjustment switching frequency and load current relationship according to claim 2, which is characterized in that described
Load current detection circuit includes first switch, second switch, phase inverter and filter resistance and filter capacitor；
The first switch and the second switch includes three pins, wherein the first pin of the first switch with it is described anti-
The input terminal of phase device connects, and the node of the input terminal of the first pin and phase inverter of the first switch also with the master control core
The secondary current feedback signal receiving terminal of piece connects, and the second pin of the first switch connects with the reference voltage generating circuit
It connects, the third pin of the first switch is connect with the first end of the filter resistance；
First pin of the second switch is connect with the output end of the phase inverter, the second pin of the second switch and institute
State the third pin connection of first switch；The second end of the filter resistance is connect with the first end of the filter capacitor, described
The second end of filter capacitor is connect with the third pin of the second switch, and the second end of the filter resistance and described second
The connecting node of the third pin of switch is load current detection voltage output end, is connect with the voltage operational circuit.
5. the control circuit of adjustment switching frequency and load current relationship according to claim 4, which is characterized in that described
First switch and the second switch is metal-oxide-semiconductor.
6. the control circuit of adjustment switching frequency and load current relationship according to claim 4, which is characterized in that described
Voltage operational circuit includes：
Error amplifier, metal-oxide-semiconductor M1, first resistor, second resistance, 3rd resistor and the 4th resistance；
First termination reference voltage of the first resistor, the second end of the first resistor pass sequentially through the second resistance,
3rd resistor and the 4th resistance eutral grounding；
The connection of the inverting input of the error amplifier and the second end of the filter resistance and the first end of filter capacitor
Node, the in-phase input end of the error amplifier are connect with the connecting node of the 3rd resistor and the 4th resistance, the mistake
The output end of poor amplifier is connect with the grid of the metal-oxide-semiconductor M1；
The drain electrode of the metal-oxide-semiconductor M1 is connect with the connecting node of the second resistance and 3rd resistor, the source electrode of the metal-oxide-semiconductor M1
It is connect with the second end of the filter capacitor, and the section that the source electrode of the metal-oxide-semiconductor M1 is connect with the second end of the filter capacitor
Point is additionally coupled to the reference voltage generating circuit；
Connecting node between the first resistor and second resistance is adjustment voltage output end, is generated with the reference voltage
Circuit connects.
7. the control circuit of adjustment switching frequency and load current relationship according to claim 6, which is characterized in that described
Reference voltage generating circuit includes：Receiving circuit, the 5th resistance and the 6th resistance；
Node connection between the first end of the receiving circuit and the first resistor and second resistance, the receiving circuit
Second end is connect with the first end of the 5th resistance, and the second end of the 5th resistance connects with the first end of the 6th resistance
It connects, the node that the second end of the 6th resistance is connect with the second end of the source electrode of the metal-oxide-semiconductor M1 and the filter capacitor connects
It connects；Node between 5th resistance and the 6th resistance is additionally coupled to the reference voltage receiving terminal of the main control chip；
Node voltage between 5th resistance and the 6th resistance is the reference voltage.
8. the control circuit of adjustment switching frequency and load current relationship according to claim 7, which is characterized in that described
Receiving circuit is buffer, and the buffer is the buffer that high resistant inputs low-resistance output.
9. adjusting the control circuit of switching frequency and load current relationship, feature according to claim 1-8 any one of them
It is, the control circuit further includes power switch, and the control terminal of the power switch is connect with the main control chip, by described
Main control chip controls the on off state of the power switch to adjust the switching frequency of power supply.
10. a kind of Switching Power Supply, which is characterized in that including claim 1-9 any one of them adjustment switching frequency and load
The control circuit of current relationship.
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| CN113794377A (en) * | 2021-08-03 | 2021-12-14 | 深圳市创芯微微电子有限公司 | Power frequency modulation circuit, switching power supply and electronic equipment |
| CN114944763A (en) * | 2022-07-25 | 2022-08-26 | 陕西中科天地航空模块有限公司 | Switching power supply frequency regulating circuit |
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| CN204497963U (en) * | 2015-03-19 | 2015-07-22 | 上海新进半导体制造有限公司 | A kind of line voltage compensation circuit and inverse excitation type converter |
| CN206698119U (en) * | 2017-02-20 | 2017-12-01 | 苏州智浦芯联电子科技股份有限公司 | A kind of Switching Power Supply output cable voltage-drop compensation circuit |
| CN208316569U (en) * | 2018-04-20 | 2019-01-01 | 深圳市芯飞凌半导体有限公司 | Adjust the control circuit and Switching Power Supply of switching frequency and load current relationship |
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| CN109946506A (en) * | 2019-04-16 | 2019-06-28 | 深圳市闿思科技有限公司 | Zero-crossing detection system |
| CN109946506B (en) * | 2019-04-16 | 2023-10-24 | 深圳市闿思科技有限公司 | Zero crossing detection system |
| CN113794377A (en) * | 2021-08-03 | 2021-12-14 | 深圳市创芯微微电子有限公司 | Power frequency modulation circuit, switching power supply and electronic equipment |
| CN113794377B (en) * | 2021-08-03 | 2022-09-27 | 深圳市创芯微微电子有限公司 | Power frequency modulation circuit, switching power supply and electronic equipment |
| CN114944763A (en) * | 2022-07-25 | 2022-08-26 | 陕西中科天地航空模块有限公司 | Switching power supply frequency regulating circuit |
| CN114944763B (en) * | 2022-07-25 | 2022-10-28 | 陕西中科天地航空模块有限公司 | Switching power supply frequency regulating circuit |
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