CN206259862U - A kind of switch transformed circuit - Google Patents
A kind of switch transformed circuit Download PDFInfo
- Publication number
- CN206259862U CN206259862U CN201621267817.6U CN201621267817U CN206259862U CN 206259862 U CN206259862 U CN 206259862U CN 201621267817 U CN201621267817 U CN 201621267817U CN 206259862 U CN206259862 U CN 206259862U
- Authority
- CN
- China
- Prior art keywords
- circuit
- signal
- inductance
- switch
- main power
- 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
- Inverter Devices (AREA)
Abstract
This application discloses a kind of switch transformed circuit.The switch transformed circuit includes：Rectification unit, the power switch circuit with main power tube and inductance, error amplifier, comparator and logic drive circuit.The comparator relative error amplifies signal and ramp signal size, and generation is used to control the comparison signal of power switch circuit.Being reset to zero during main power tube disconnects, increase during main power tube is turned on, the voltage at inductance two ends is into negative correlation when the slope that it increases is turned on main power tube for the ramp signal.The switch transformed circuit improves the harmonic characterisitic of circuit, meets the standard of class C.
Description
Technical field
The utility model is related to a kind of field of power electronics, and more specifically, the utility model is related to a kind of switch change-over
Circuit.
Background technology
Switch transformed circuit due to its high efficiency, it is easy to control the advantages of, be widely applied in Power convert field.
In AC-DC (AC-DC) conversion, in order to the input current for preventing converter is polluted to power network, converter is usually required that
Reach the power factor harmonic requirement of industry or every country/local regulations.
In the multiple control modes of switch transformed circuit, constant on-time (constant on time, COT) control by
In transient response speed is fast, advantages of simple structure and simple, it is widely adopted.
Buck converters are buck topologies, and when on-Line Voltage is less than output voltage, converter does not work, therefore input electricity
There is Dead Time in stream.As shown in figure 1, in moment 0 to moment t1 and moment t2 between moment t3, due to line voltage Vac
Less than output voltage VO, converter do not work, inductive current iLIt is zero.The Dead Time prevents harmonic wave from meeting class-C's
It is required that.
Utility model content
Therefore the purpose of this utility model is the above-mentioned technical problem for solving prior art, proposes a kind of improved switch
Translation circuit.
To achieve the above object, according to embodiment of the present utility model, it is proposed that a kind of switch transformed circuit, including：It is whole
Stream unit, receives AC-input voltage, produces commutating voltage；Power switch circuit, including main power tube and inductance, wherein in master
During power tube is switched on, electric current increase, the inductance storage energy of inductance are flowed through；During main power tube is disconnected, on inductance
The energy of storage is released, to pass to output；Error amplifier, feedback signal and reference signal to characterizing output signal
Difference is amplified, and produces error amplification signal；Comparator, relative error amplify signal and ramp signal size, producing ratio compared with
Signal, wherein the ramp signal is being reset to zero, is increasing during main power tube is turned on during main power tube disconnects, its increasing
The voltage at inductance two ends is into negative correlation when slope long is turned on main power tube；Logic drive circuit, produces according to comparison signal
Logical drive signal, is used to control the operation of power switch circuit.
According to switch transformed circuit of the present utility model, the harmonic characterisitic of circuit is improved, circuit is met class C
Requirement.
Brief description of the drawings
Fig. 1 schematically shows line voltage Vac, the inductive current i of the buck converter using tradition COT controlsLWith
It is input into the timing waveform of average current；
Fig. 2 schematically shows the switch transformed circuit 100 according to the utility model embodiment；
Fig. 3 schematically shows the control electricity of the switch transformed circuit 100 according to Fig. 2 of the utility model embodiment
Road 105 and the electrical block diagram of slope generating circuit 106；
Fig. 4 schematically shows the switch transformed circuit 200 according to the embodiment of the utility model one；
Fig. 5 schematically shows the switch transformed circuit 300 according to the embodiment of the utility model one；
It is foregoing according to this when the virtual value that Fig. 6 schematically shows AC-input voltage is 230 volts (Vin=230V)
The input current i of the switch transformed circuit of utility model embodimentacSwitch transformed circuit under (solid line) and tradition cot control
Input current iprThe timing waveform of (dotted line)；
It is foregoing according to this when the virtual value that Fig. 7 schematically shows AC-input voltage is 115 volts (Vin=115V)
The input current i of the switch transformed circuit of utility model embodimentacSwitch transformed circuit under (solid line) and tradition cot control
Input current iprThe timing waveform of (dotted line)；
Fig. 8 shows that each time of the AC input current of the foregoing switch transformed circuit according to the utility model embodiment is humorous
Ripple；
The electricity of controlled current source 62 in the ramp signal generating circuit 106 that Fig. 9 shows according to the utility model embodiment
Line structure schematic diagram；
Figure 10 is the schematic flow sheet 400 of the method for switch transformed circuit according to the utility model embodiment.
Specific embodiment
Specific embodiment of the utility model is described more fully below, it should be noted that the embodiments described herein is served only for
For example, being not limited to the utility model.In the following description, in order to provide to thorough understanding of the present utility model,
Elaborate a large amount of specific details.It will be apparent, however, to one skilled in the art that：These certain details need not be used
Save to carry out the utility model.In other instances, in order to avoid obscuring the utility model, do not specifically describe known circuit,
Material or method.
Throughout the specification, meaning is referred to " one embodiment ", " embodiment ", " example " or " example "
：Special characteristic, structure or the characteristic described with reference to the embodiment or example are comprised in the implementation of the utility model at least one
In example.Therefore, entire disclosure each place occur phrase " in one embodiment ", " in embodiment ", " one
Example " or " example " are not necessarily all referring to same embodiment or example.Furthermore, it is possible to any appropriate combination and/or sub-portfolio
By specific feature, structure or property combination in one or more embodiments or example.Additionally, those of ordinary skill in the art
It should be appreciated that accompanying drawing is provided to descriptive purpose provided herein, and accompanying drawing is not necessarily drawn to scale.Should manage
Solution, when claim element " being couple to " or " being connected to " another element when, it can be directly couple or be couple to another element or
There may be intermediary element.Conversely, when element " being directly coupled to " or " being directly connected to " another element is claimed, in the absence of centre
Element.Identical reference indicates identical element.Term "and/or" used herein is listed including one or more correlations
Project any and all combination.
Fig. 2 schematically shows the switch transformed circuit 100 according to the utility model embodiment.Implementing shown in Fig. 2
In example, switch transformed circuit 100 includes：Rectification unit 101, receives AC-input voltage (line voltage) Vac, produces commutating voltage
Vdc (the steamed bun ripple generally said)；Power switch circuit 102, including main power tube and inductance, wherein being switched in main power tube
Period, flow through electric current increase, the inductance storage energy of inductance, during main power tube is disconnected, the energy quilt stored on inductance
Release, to pass to output；Error amplifier (EA) 103, receives and characterizes output signal (such as output voltage VOOr output current
IO) feedback signal FB and reference signal REF, the error amplifier 103 is to feedback signal FB and the difference of reference signal REF
It is amplified, produces error amplification signal CMP；Comparator 104, receives the error amplification signal CMP and ramp signal ramp,
The relative error of the comparator 104 amplifies signal CMP and ramp signal ramp sizes, comparison signal is produced, wherein the slope
Signal ramp is increasing during main power tube is turned on, is being reset to zero during main power tube disconnects, slope and the electricity of its growth
The slope (voltages at inductance two ends when i.e. main power tube is turned on) that inducing current increases increases faster into negative correlation, i.e. inductive current
(inductance both end voltage is bigger), ramp signal ramp increases slower, and inductive current increases slower that (inductance both end voltage is got over
It is small), ramp signal ramp increases faster；Logic drive circuit 105, receives comparison signal, produces logical drive signal Dr, uses
To control the operation of power switch circuit 102.
In one embodiment, when ramp signal ramp is more than error amplification signal CMP, main power tube is disconnected, electricity
Inducing current is begun to decline, until inductive current drops to zero, main power tube is turned on again.That is, circuit runs on facing
Boundary's pattern, to reduce switching loss.
In the embodiment depicted in figure 2, the logic drive circuit 105 also receives inductive current zero passage detection signal ZCD, and
Response zero passage detection signal ZCD turns on main power tube.That is, the zero passage detection signal ZCD characterizes inductive current
Zero crossing.
When constant pressure demand (such as notebook computer, desktop computer) is output as, feedback signal FB characterizes output voltage VO；When
When being output as constant current demand (such as LED illumination), feedback signal FB characterizes output current IO。
In one embodiment, the ramp signal ramp is produced by ramp signal generating circuit.
Fig. 3 schematically shows the control electricity of the switch transformed circuit 100 according to Fig. 2 of the utility model embodiment
Road 105 and the electrical block diagram of slope generating circuit 106.In the embodiment shown in fig. 3, the ramp signal generating circuit
106 include：Constant current source 61, there is provided constant charging current；Controlled current source 62, there is provided controlled discharge current；It is in parallel
The electric capacity 63 and reset switch 64 of coupling, the wherein main power in the conducting state of reset switch 64 and power switch circuit 102
Pipe conversely, the electric capacity 63 is reset to zero when reset switch 64 is turned on, when reset switch 64 disconnects by constant current source
61 charge, while discharged by controlled current source 62, the both end voltage of the electric capacity 63 is ramp signal ramp.
When power switch circuit is using buck topologys, discharge current and AC-input voltage that controlled current source 62 is provided
The instantaneous value of Vac and the difference of output voltage are proportional；When power switch circuit 102 is using boost topologys, controlled current source 62
The discharge current of offer is proportional to input voltage.I.e.：The electric current that controlled current source 62 is provided is applied during being turned on main power tube
The voltage being added on inductance is proportional.
In the embodiment shown in fig. 3, the logic drive circuit 105 includes：Rest-set flip-flop 51, with set input S,
The RESET input R and output end Q, the set input S receive zero passage detection signal ZCD, the RESET input R reception and compare letter
Number, rest-set flip-flop response zero passage detection signal ZCD is set, respond comparison signal is reset, generation logical signal；Drive
Device 52, response logic signal produces logical drive signal Dr, is used to control the operation of power switch circuit 102.
Fig. 4 schematically shows the switch transformed circuit 200 according to the embodiment of the utility model one.Real shown in Fig. 4
Apply in example, the power switch circuit 102 includes typical buck converter.The output of switch transformed circuit 200 shown in Fig. 4 is used to
LED strip is driven, therefore it is required that being output as constant current.Specifically, in the embodiment shown in fig. 4, the switch transformed circuit 200 is wrapped
Include：Rectification unit 101, receives AC-input voltage (line voltage) Vac, produces commutating voltage Vdc；Power switch circuit 102, bag
Main power tube 21, inductance 22 and afterflow power tube 23 are included, wherein during main power tube 21 is switched on, flowing through the electric current of inductance 22
Increase, the storage energy of inductance 22, during main power tube 21 is disconnected, the energy stored on inductance passes through the quilt of afterflow power tube 23
Release, to pass to output；Error amplifier (EA) 103, receives the feedback signal I for characterizing output currentFBAnd reference signal
REF, the error amplifier 103 is to feedback signal IFBDifference with reference signal REF is amplified, and produces error amplification signal
CMP；Comparator 104, receives the error amplification signal CMP and ramp signal ramp, and the relative error of the comparator 104 is amplified
Signal CMP and ramp signal ramp sizes, produce comparison signal；Logic drive circuit 105, receives comparison signal, produces logic
Drive signal Dr, is used to control the operation of power switch circuit 102；Ramp signal generating circuit 106, the ramp signal is produced
Circuit includes：Constant current source 61, there is provided constant charging current；Controlled current source 62, the voltage according to the two ends of inductance 22 is carried
For discharge current, the voltage at the wherein two ends of inductance 22 is bigger, and the discharge current of controlled current source 62 is also bigger；Coupled in parallel than
Compared with electric capacity 63 and reset switch 64 between device 104 and reference ground, the wherein conducting state of reset switch 64 and main power tube 22
Conversely, the electric capacity 63 is reset when main power tube 22 disconnects, switch 64 is reset to zero, permanent when main power tube 22 is turned on
Constant current source 61 charges and is discharged by controlled current source 62 simultaneously, and the both end voltage of the electric capacity 63 is the ramp signal ramp.
Because when main power tube disconnects, electric capacity 63 is reset；And when main power tube is turned on, electric capacity is by constant current source
61 charge is discharged by controlled current source 62 simultaneously, therefore the discharge current that controlled current source 62 is provided actually is led by main power tube
The voltage at the two ends of inductance 22 is determined during logical.
In the embodiment shown in fig. 4, the switch transformed circuit 200 also includes：Operational amplifier OP, is connected across inductance 22
Two ends, produce the sampled voltage V for characterizing the both end voltage of inductance 22L。
In one embodiment, error amplifier 103, comparator 104, logic drive circuit 105 and ramp signal are produced
Circuit 106 is integrated into a chip.
Fig. 5 schematically shows the switch transformed circuit 300 according to the embodiment of the utility model one.Switch shown in Fig. 5
Translation circuit 300 is consistent with the principle of switch transformed circuit 200 shown in Fig. 4.From unlike switch transformed circuit 200 shown in Fig. 4,
In the embodiment shown in fig. 5, the error amplifier 103, comparator 104, logic drive circuit 105 and ramp signal produce electricity
The reference ground on road 106 is chip ground GND, and chip ground GND is coupled to the common coupling point of main power tube 21 and inductance 22；It is described
Switch transformed circuit 300 also includes：Current sampling resistor Ri, with being coupled in chip and main power tube 21 between, produces sign defeated
Go out the feedback signal I of electric currentFB；Feedback resistance Rc, is coupled to inductance 22, produces the sampled voltage for characterizing the both end voltage of inductance 22
VL。
When circuit runs, when the instantaneous value of AC-input voltage Vac is more than output voltage VOWhen, power switch circuit
102 start working.When main power tube 21 is switched on, reset switch 63 is disconnected, then electric capacity 63 starts by constant current source 61
Charge, discharged by controlled current source 62, ramp signal ramp starts increase.With the increase of AC-input voltage Vac, switch is led
During logical, the voltage (Vac-V at the two ends of inductance 22O) increase therewith, sampled voltage VLAlso increase therewith, controlled current source 62 is put
Electric current also increases.Accordingly, the slope of ramp signal ramp increases diminishes.That is slope and main work(that ramp signal ramp increases
Into negative correlation, inductance both end voltage is high during switch conduction, and the growth of ramp signal is oblique for the voltage at inductance two ends when rate pipe is turned on
Rate is smaller, and when inductance both end voltage is low during switch conduction, the growth slope of ramp signal is larger.Ramp signal ramp will later
Meet the error amplification signal CMP of the output of error amplifier 103.And because the response speed of error amplifier is very slow, and bandwidth
Less than the frequency (such as 50hz) of line voltage, error amplification signal CMP can be considered constant in a switch periods.Therefore, with
The increase of AC-input voltage Vac, the ON time ton of main power tube 21 also increases.
It is foregoing according to this when the virtual value that Fig. 6 schematically shows AC-input voltage is 230 volts (Vin=230V)
The input current i of the switch transformed circuit of utility model embodimentacSwitch transformed circuit under (solid line) and tradition cot control
Input current iprThe timing waveform of (dotted line).
It is foregoing according to this when the virtual value that Fig. 7 schematically shows AC-input voltage is 115 volts (Vin=115V)
The input current i of the switch transformed circuit of utility model embodimentacSwitch transformed circuit under (solid line) and tradition cot control
Input current iprThe timing waveform of (dotted line).
Fig. 8 shows that each time of the AC input current of the foregoing switch transformed circuit according to the utility model embodiment is humorous
Ripple, wherein curve 10 represent the higher limit of class C, and solid line moulding represents each time of the input current of the utility model embodiment
Harmonic amplitude, dotted line moulding represents each harmonic amplitude of the AC input current of the lower switch transformed circuit of traditional COT controls.From
Fig. 8 always can see, and the AC input current each harmonic based on the utility model embodiment can meet wanting for class C
Ask, and conventional method cannot meet.
Fig. 8 can be seen that the foregoing switch transformed circuit according to the utility model each embodiment and meet class C marks
It is accurate.
The electricity of controlled current source 62 in the ramp signal generating circuit 106 that Fig. 9 shows according to the utility model embodiment
Line structure schematic diagram.In the embodiment shown in fig. 9, the controlled current source 62 includes：Such as scheme coupling operational amplifier 601,
Transistor 602 and resistance 603, by sampled voltage VLIt is converted into current signal i1；Current mirror 604, receives current signal i1, output
Controlled discharge current (the icon).In one embodiment, the current class i1 of the current signal is discharge current icon
Hundred times to thousands of times.
Further, the utility model also proposed a kind of method for switch transformed circuit, and as shown in Figure 10 is
The schematic flow sheet 400 of the method for switch transformed circuit according to the utility model embodiment, the switch transformed circuit
Including power switch circuit, the power switch circuit includes main power tube and inductance, wherein during main power tube is switched on,
Inductance storage energy, during main power tube is disconnected, the energy stored on inductance is released, described to produce output signal
Method includes：
Step 402, there is provided characterize output signal feedback signal, characterize inductance both end voltage sampled voltage；
Step 404, the difference of the feedback signal and reference signal is amplified, and obtains error amplification signal；
Step 406, main power tube turn on during, by constant current source give electric capacity charge, while by with inductance two
The related controlled current source of terminal voltage discharges to the electric capacity, to produce ramp signal；During main power tube disconnects, to described
Ramp signal is resetted；
Step 408：Ramp signal and error amplification signal are compared, comparison signal is produced；
Step 410, responds comparison signal, disconnects the main power tube.
In one embodiment, the discharge current of the controlled current source is directly proportional to inductance both end voltage.
In one embodiment, methods described also includes：The zero crossing of inductive current is detected, zero passage detection signal is produced；
Response zero passage detection signal, turns on the main power tube.
Although exemplary embodiment describing the utility model with reference to several, it is to be understood that, term used is explanation
With exemplary and nonrestrictive term.Because the utility model can be embodied without deviating from practical new in a variety of forms
Type it is spiritual or substantive, it should therefore be appreciated that above-described embodiment is not limited to any foregoing details, and should be in appended claims
Widely explained in the spirit and scope for being limited, therefore the whole fallen into claim or its equivalent scope changes and retrofits
Appended claims are all should be to be covered.
Claims (7)
1. a kind of switch transformed circuit, it is characterised in that including：
Rectification unit, receives AC-input voltage, produces commutating voltage；
Power switch circuit, including main power tube and inductance, wherein during main power tube is switched on, the electric current for flowing through inductance increases
Greatly, inductance storage energy；During main power tube is disconnected, the energy stored on inductance is released, to pass to output；
Error amplifier, the difference of feedback signal and reference signal to characterizing output signal is amplified, and produces error to amplify
Signal；
Comparator, relative error amplifies signal and ramp signal size, comparison signal is produced, wherein the ramp signal is in main work(
Rate pipe is reset to zero, increases during main power tube is turned on during disconnecting, the electricity when slope that it increases is turned on main power tube
The voltage at two ends is felt into negative correlation；
Logic drive circuit, logical drive signal is produced according to comparison signal, is used to control the operation of power switch circuit.
2. switch transformed circuit as claimed in claim 1, it is characterised in that wherein described logic drive circuit also receives inductance
Current over-zero detection signal, and respond the zero passage detection signal and turn on main power tube.
3. switch transformed circuit as claimed in claim 1, it is characterised in that also include：Ramp signal generating circuit, produces institute
Ramp signal is stated, the ramp signal generating circuit includes：
Constant current source, there is provided constant charging current；
Controlled current source, there is provided controlled discharge current；
The conducting state and main power tube of the electric capacity and reset switch of coupled in parallel, wherein reset switch are conversely, the electric capacity exists
Reset switch is reset to zero when turning on, when reset switch disconnects by constant current source charging, while being put by controlled current source
Electricity, the electric capacity both end voltage is ramp signal.
4. switch transformed circuit as claimed in claim 3, it is characterised in that the electric current that wherein described controlled current source is provided with
The voltage that main power tube is applied on inductance during turning on is proportional.
5. switch transformed circuit as claimed in claim 1, it is characterised in that also include：Operational amplifier, is connected across inductance two
End, produces the sampled voltage for characterizing inductance both end voltage.
6. switch transformed circuit as claimed in claim 1, it is characterised in that wherein described error amplifier, comparator, logic
Drive circuit and ramp signal generating circuit are integrated into chip.
7. switch transformed circuit as claimed in claim 1, it is characterised in that also include：Feedback resistance, is coupled to inductance, produces
The raw sampled voltage for characterizing inductance both end voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621267817.6U CN206259862U (en) | 2016-11-23 | 2016-11-23 | A kind of switch transformed circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621267817.6U CN206259862U (en) | 2016-11-23 | 2016-11-23 | A kind of switch transformed circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206259862U true CN206259862U (en) | 2017-06-16 |
Family
ID=59026888
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621267817.6U Active CN206259862U (en) | 2016-11-23 | 2016-11-23 | A kind of switch transformed circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206259862U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106787831A (en) * | 2016-11-23 | 2017-05-31 | 杰华特微电子（杭州）有限公司 | A kind of switch transformed circuit and its control method |
| CN110224592A (en) * | 2019-06-13 | 2019-09-10 | 南京矽力杰半导体技术有限公司 | Multiphase critical conduction power inverter and its control method |
| US20220038008A1 (en) | 2020-07-29 | 2022-02-03 | Silergy Semiconductor Technology (Hangzhou) Ltd | Control module and multi-phase power converter |
| US12027974B2 (en) | 2021-01-06 | 2024-07-02 | Silergy Semiconductor Technology (Hangzhou) Ltd | Control circuit and switching converter |
-
2016
- 2016-11-23 CN CN201621267817.6U patent/CN206259862U/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106787831A (en) * | 2016-11-23 | 2017-05-31 | 杰华特微电子（杭州）有限公司 | A kind of switch transformed circuit and its control method |
| CN110224592A (en) * | 2019-06-13 | 2019-09-10 | 南京矽力杰半导体技术有限公司 | Multiphase critical conduction power inverter and its control method |
| CN110224592B (en) * | 2019-06-13 | 2021-08-13 | 南京矽力微电子技术有限公司 | Multiphase critical conduction power converter and control method thereof |
| US11581812B2 (en) | 2019-06-13 | 2023-02-14 | Silergy Semiconductor Technology (Hangzhou) Ltd | Multi-phase power converter, control circuit and control method thereof |
| US11942867B2 (en) | 2019-06-13 | 2024-03-26 | Silergy Semiconductor Technology (Hangzhou) Ltd | Apparatus and method of controlling a multi-phase power converter, having a plurality of power stage circuits coupled in parallel |
| US20220038008A1 (en) | 2020-07-29 | 2022-02-03 | Silergy Semiconductor Technology (Hangzhou) Ltd | Control module and multi-phase power converter |
| US11831242B2 (en) | 2020-07-29 | 2023-11-28 | Silergy Semiconductor Technology (Hangzhou) Ltd | Control module and multi-phase power converter |
| US12027974B2 (en) | 2021-01-06 | 2024-07-02 | Silergy Semiconductor Technology (Hangzhou) Ltd | Control circuit and switching converter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106059313B (en) | The circuit of reversed excitation and its control method of active clamp | |
| CN206259862U (en) | A kind of switch transformed circuit | |
| TWI472139B (en) | The control circuit of the flyback converter, the control method and the AC-DC power conversion circuit | |
| CN102916593B (en) | Power converter circuit | |
| WO2019080400A1 (en) | Sic power device-based full-bridge llc resonant plasma power supply | |
| CN103428969B (en) | A kind of linear constant current LED drive circuit and LED lamp | |
| CN102946196B (en) | High power factor constant current driving circuit and constant-current device | |
| WO2017190007A1 (en) | Wide-operating-range resonant-transition soft-switched converter | |
| CN101552560A (en) | Switch voltage stabilizing circuit and control method thereof | |
| CN201805362U (en) | Step current limiting circuit used for aviation AC/DC conversion | |
| CN102377354A (en) | Converter | |
| CN103716965A (en) | LED driving device and control circuit and output current detection circuit thereof | |
| CN106787831A (en) | A kind of switch transformed circuit and its control method | |
| CN104702095A (en) | Switching power supply controller and switching power supply comprising switching power supply controller | |
| CN110429837A (en) | Wide scope input and output AC-DC converter | |
| CN103647448B (en) | Integrated step-down-flyback type high power factor constant current circuit and device | |
| CN107800312A (en) | A kind of output ripple and low pfc converter | |
| CN102437752A (en) | Grading limiting circuit for aerospace alternative-current/direct-current (AC/DC) converter | |
| CN115065230B (en) | Three-phase bridgeless SEPIC type PFC converter | |
| CN103269162B (en) | A kind of Quasi-single-stage high power factor constant current circuit and device | |
| CN203617902U (en) | Integrated buck-flyback type high power factor constant current circuit and device | |
| CN208461691U (en) | A kind of Capacitor apart resonance type power factor correction converter | |
| CN110518818A (en) | CRM decompression-flyback pfc converter of fixed-frequency control | |
| CN106100392A (en) | Eliminate working frequency ripple wave high efficiency high power factor AC/DC power circuit and method of supplying power to thereof and control method | |
| CN105978327B (en) | A kind of booster converter and its control method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: Room 901-23, 9 / F, west 4 building, Xigang development center, 298 Zhenhua Road, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province, 310030 Patentee after: Jiehuate Microelectronics Co.,Ltd. Address before: Room 424, building 1, 1500 Wenyi West Road, Cangqian street, Yuhang District, Hangzhou City, Zhejiang Province Patentee before: JOULWATT TECHNOLOGY (HANGZHOU) Co.,Ltd. |
|
| CP03 | Change of name, title or address |