CN110011552A - Switching Power Supply control method and circuit - Google Patents
Switching Power Supply control method and circuit Download PDFInfo
- Publication number
- CN110011552A CN110011552A CN201810013152.3A CN201810013152A CN110011552A CN 110011552 A CN110011552 A CN 110011552A CN 201810013152 A CN201810013152 A CN 201810013152A CN 110011552 A CN110011552 A CN 110011552A
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- controller
- power supply
- power switch
- coupled
- switching power
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33561—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having more than one ouput with independent control
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33592—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
-
- 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
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present patent application discloses a kind of Switching Power Supply control method and circuit.The Switching Power Supply includes input capacitor, transformer, the first power switch, the first controller；Output capacitor, the second power switch, second controller；The second controller controls the second power switch into output capacitor transmittance process in input capacitor energy and synchronizes rectification；The second controller detection load voltage and electric current, generate the working condition that first control signal controls the first power switch, load voltage and electric current are made to meet desired value；The second controller controls the second power switch and generates an ON/OFF movement, and the portion of energy of output capacitor is transmitted to input capacitor；When first controller has detected that energy is transmitted to input capacitor from output capacitor, the first power switch of control changes working condition；First control signal is transmitted without optocoupler or special package frame based on Switching Power Supply of the invention, it is at low cost, it is high-efficient.
Description
Technical field
The present invention relates to switch power technologies, particularly, the present invention relates to a kind of Switching Power Supply control method and accordingly
Control circuit.
Background technique
Switching Power Supply has many advantages, such as that size is small, high conversion efficiency, and application field constantly expands, including charger, suitable
Orchestration etc..In recent years, major country proposes increasingly higher demands for the transfer efficiency of Switching Power Supply in the world, to meet
The VI grades of efficiencies requirement of the newest class requirement of European Union's efficiency (second stage) and U.S. Department of Energy, Switching Power Supply generally use synchronize it is whole
Flow Technique raising efficiency.It is higher and higher for the required precision of charger output voltage for the requirement for meeting mobile phone quick charge,
Require charger output voltage that can need to be adjusted according to load simultaneously.Meet the charger of the specification of USB PD 3.0,
Output voltage variation range is 3V~21V, and voltage minimum interval is 20mV.
It is traditional primary side (or primary side) regulating switch mains charger system 100A schematic diagram shown in Figure 1A.This is opened
Closing mains charger includes that (AC voltage range is generally 85V to ac input end mouthACTo 265VAC), rectifier bridge 101 (will exchange
Voltage VACBe converted to DC voltage VIN), input capacitance 102, transformer 120, the first controller 104, the first power switch 105,
Primary side (or secondary side) synchronous rectifying power switch 122, output capacitance 121, synchronous rectifying controller 124, output capacitance
121, output port (V0) etc..The output voltage of Switching Power Supply shown in Figure 1A is controlled by the controller 104 for being located at primary side, secondary
Side controller 124 is only used for synchronous rectification control, is not necessarily to optocoupler, cost is relatively low.But output voltage precision is sampled defeated by primary side
The error limitation of voltage out, is generally only able to satisfy +/- 5% volume production precision.
Switching Power Supply shown in Figure 1B is a kind of charger without optocoupler.The primary side controller of Switching Power Supply 100B and
Secondary side synchronous rectifier controller is placed among the same encapsulation, secondary side controller by the parasitic inductance of packaging frame to
The working condition of primary side controller transmitting control signal control primary side power switch.The output voltage of Switching Power Supply 100B passes through
It is secondary side controller reception by divider resistance 125 and 126, output voltage is adjusted by secondary side controller, therefore can be guaranteed
Higher voltage accuracy reaches +/- 2.5% volume production level.It is needed although not needing optocoupler in Switching Power Supply 100B, 104
Special encapsulation, thus system cost is higher.
In conclusion compeling to be essential to meet the requirement of Switching Power Supply higher output voltage precision, lower system cost
Develop a kind of Switching Power Supply control method and circuit that output voltage and electric current are controlled without optocoupler, by primary side.This is exactly
Target of the invention.
The purpose of the present invention is to overcome the shortcomings of the existing technology, proposes a kind of new primary side regulating switch power supply electricity
Pressure/current control method and circuit reduce the loss of prior art primary side power switch, adapt to the demand of quick charge.
According to an embodiment of the invention, proposing a kind of Switching Power Supply, comprising: input port, be coupled to alternating voltage or
DC voltage；Input capacitor, being coupled to input port, (when input voltage is alternating current, input capacitance is coupled by rectifier bridge
To alternating voltage)；Transformer, has primary (first) winding and secondary (second) winding, and armature winding is coupled to input capacitance；
Primary (first) power switch, is coupled to primary winding, has two kinds of working conditions of on and off；First is (primary
Side) controller, it is coupled to prime power switch and transformer, the working condition of control prime power switch；Output port, coupling
It is loaded to Switching Power Supply, provides voltage and current to load；Output capacitor, be coupled to output port and transformer secondary output around
Group；Second (primary side) power switch, is coupled to transformer secondary output winding, has two kinds of working conditions of on and off；Second
(primary side) controller is coupled to the second power switch, output port and transformer secondary output winding.Second controller energy from
Input capacitance controls the second power switch when transmitting to output capacitance and synchronizes rectification；Second controller also detects load voltage
And electric current, first control signal is generated according to the error of load voltage or current signal；Second controller will be by that will export electricity
Hold the mode that energy is transmitted to input capacitance and first control signal is transmitted to the first controller；First controller is according to obtaining
First control signal changes the working condition of the first power switch, and load voltage or electric current is made to meet preset value；
Detailed description of the invention
Figure 1A, Figure 1B are existing Switching Power Supply schematic diagram；
Fig. 2 is based on Switching Power Supply schematic diagram of the invention；
Fig. 3 is based on AC-DC converter schematic diagram of the invention；
Fig. 4 is based on Fig. 2 of the present invention to switch power controller key node waveform diagram shown in Fig. 3；
Specific embodiment
Specific implementation of the invention described in detail below.The example of embodiment provides in the accompanying drawings.It should be noted that retouching here
The example stated is used only to for example, being not intended to restrict the invention.For the ease of understanding thoroughly the present invention, elaborate to implement
Details.However, for persons skilled in the art it is readily apparent that this hair need not also can be implemented using these details
It is bright.In describing the embodiments of the present, in order to avoid obscuring the present invention, circuit well-known in the art, such as primary side are controlled
Typical synchronous rectification module, constant pressure, constant flow module and drive module are not described specifically in device.
Throughout the specification, to " one embodiment ", " embodiment " refer to it is meant that in conjunction with the embodiment describe
Special characteristic, structure or characteristic are comprised at least one embodiment of the invention.Therefore, the whole instruction eachly
The phrase " in one embodiment " that just occurs is not necessarily all referring to the same embodiment " in embodiment ".Furthermore, it is possible to appointing
What it is appropriate combination and (or) sub-portfolio by specific feature, structure or property combination in one or more embodiment.
Therefore, it will be appreciated by one with ordinary skill in the art that attached drawing is provided to illustration purpose provided herein, and attached drawing is different
Surely it is drawn to scale.It should be pointed out that it may be coupled directly to another member when claiming element " to be coupled to " another element
Part, there may also be intermediary elements.On the contrary, intermediary element is not present when claiming element " to be directly coupled to " another element.It is identical
Or similar appended drawing reference indicates same or similar element or the element with same or like operation.
Fig. 2 is based on 200 schematic diagram of primary side regulating switch power supply of the invention.It is opened with existing shown in Figure 1A, Figure 1B
Powered-down source 100A, 100B the difference is that, the output voltage/electric current of Switching Power Supply 200 and synchronous rectification are by primary side
Controller 224 is realized, optocoupler is not necessarily to, without special package form.
In primary side regulating switch power supply 200 of the present invention shown in Fig. 2, input voltage vin is DC voltage, Switching Power Supply
200 be DC-to-dc converter；Input voltage vin can also be obtained by AC rectification, as shown in figure 3, Switching Power Supply 300
For AC-DC converter.
The embodiment of the present invention and advantage are described in detail below in conjunction with Fig. 2, Fig. 3.
Present invention could apply to need to carry out in the DC-to-dc converter power supply of input and output electrical isolation.Such as Fig. 2
Shown, Switching Power Supply 200 includes transformer 220, is made of armature winding, secondary windings and auxiliary (third) winding.Auxiliary around
Group can be normal shock relationship (phase is identical) with armature winding, and auxiliary winding is also possible to flyback relationship (phase with primary side winding
Position is opposite).It converts and applies in DC-DC, such as Power over Ethernet POE scheme 48V turns in 12V application, it is convenient to omit auxiliary
Winding couples armature winding by divider resistance for the control signal receiving end VS of controller 204.
Switching Power Supply 200 shown in Fig. 2 further includes input port (VIN), input (first) capacitor 202, primary side (first)
Controller 204, the first power switch 205, the second power switch 222, primary side (second) controller 224, output (second) electricity
Hold 221, output port (V0), output voltage divider resistance 225 and 226, secondary windings waveforms detection resistance 223, primary side control
Device storage capacitor 207 processed, primary side current detection resistance 208, auxiliary winding divider resistance 209 and 210, auxiliary winding rectification two
Pole pipe 206, start-up resistor 203.For the charging current for limiting storage capacitor 207, the anode in rectifier diode 206 can choose
One current-limiting resistance of (or cathode) series connection (Fig. 2 is not drawn).
It is different from existing switch power technology shown in Figure 1A and Figure 1B, the secondary based on Switching Power Supply 200 (Fig. 2) of the invention
Power switch 222 is not only used as secondary synchronization rectified power device, and it is primary to be used as the control for generating secondary controller 224
The control signal of 205 working condition of power switch is transferred to Docket No 204.Second controller 224 detects load voltage, root
The first control signal PD_SW for changing 205 working condition of the first power switch is generated according to the error of load voltage, and first is controlled
Signal PD_SW processed is transferred to the first controller 204；Second controller 224 will by the conducting and shutdown of the second power switch 222
The energy of second capacitor 221 is transmitted to first capacitor device 202, and first control signal PD_SW is transmitted to first by this method
Controller 204；After first controller 204 detects that first capacitor device 202 obtains the energy of the second capacitor 221 transmitting, control
First power switch 205 changes working condition, meets preset value to control load voltage；
Secondary controller 224 includes synchronous commutating control circuit, and output voltage regulation circuit also may include output electric current
Adjust circuit.Docket No 204 includes primary current detection circuit, controls signal receiving circuit and prime power switch 205
Driving circuit.A kind of specific embodiment of 200 control loop of Switching Power Supply is as follows: when secondary windings is output capacitance
After 221 charging process, secondary power switch 222 is in off state, and prime power switch 205 is also at cut-off shape
State.When the work of Switching Power Supply 200 is in constant voltage mode, secondary controller 224 is generated according to the error of the output voltage detected
Prime power switch 205 opens control signal PD_SW constantly next time.For the control signal is transmitted by secondary controller 224
To Docket No 204, secondary controller 224 makes the second power switch 222 open an of short duration period output capacitance
221 portion of energy is transferred to input capacitance 202.The control signal receiving circuit of Docket No 204 detected energy from
When output capacitance 221 is transferred to input capacitance 202, that is, identify this be second controller 224 send need prime power
The first control signal PD_SW that switch 205 is opened.Docket No 204 is with by prime power switch 205 being switched to conducting shape
State, when primary side current reaches the first peak point current IPPWhen, the current detection circuit in 204 switches the first power switch 205
For off state, the constant pressure closed-loop control of a cycle is realized.
Current constant control can also be realized by secondary controller 224 based on Switching Power Supply of the invention.Specific implementation is shown in
Fig. 3.
Fig. 3 is based on AC-DC converter power source design of the invention.Input port VINIt is coupled by rectifier bridge 201
To alternating voltage VAC, Switching Power Supply 300 works in discontinuous conduction mode (DCM), and primary side controller 204 connects including open signal
Circuit 302 is received, auxiliary winding (tertiary winding) is coupled to by divider resistance 209 and 210, is responsible for receiving from secondary controller
The 224 first control signal PD_SW that power switch 205 is switched to on state from off state.Controller 204 further includes
Primary side peak point current comparator 303, first, which compares end, is coupled to primary side current detection resistance 208, and second compares end coupling
It is bonded to reference voltage VREF1.When the primary side open signal receiving module 302 in the first controller 204 detects secondary side controller
After the 224 first control signal PD_SW for needing primary side power switch 205 to open generated, module 302 exports a positive pulse letter
The output OUT of rest-set flip-flop 301 is set 1 by number POW_ON, and power switch 205 enters on state, primary side winding electric current IPIt is opened from 0
Begin linearly increasing, works as IPElectric current increases to IPP=VREF1/R208When, comparator 303 exports a positive pulse signal POW_OFF will
The output OUT clear 0 of rest-set flip-flop 301, power switch 205 enter off state.
Second controller 224 shown in Fig. 3 includes synchronous rectification control module 404, constant-current control module 401, constant pressure control
Molding block 402, with door 403 or door 405.Second controller 224 detects transformer secondary output winding by port DET and resistance 223
To the charging time T of output capacitance 221ONS, controlled for synchronous rectification control and constant current/constant voltage.As mentioned in the previous paragraph, it flows through just
The electric current of grade power switch 205 reaches IPPWhen the first controller 204 prime power switch 205 is switched to cut-off by state
State.Export average current
I0=(1/2) * IPP*(NP/NS)*TONS/TSW
Wherein IPP=VREF1/R208For fixed value, TSWFor switch periods, TSW=TONS+TDIS+TONP, TDISBroken time, i.e.,
From TONSTerminate to the period that the first power switch 205 is opened next time, TONPFor the first power switch turn-on time；NPTo become
Depressor armature winding the number of turns, NSFor transformer secondary output umber of turn.Constant current function implementation is as follows: second controller 224 is controlled
Make the broken time T of each switch periodsDIS, make TONS/TSWValue be no more than a fixed upper limit (such as 0.5).
As the T of a cycleDISCurtailment is so that TONS/TSWWhen less than the fixed upper limit (such as 0.5), constant-current control module it is defeated
Signal (constant current is enabled) CC_EN=0 out, even if output signal (constant pressure is enabled) CV_EN=1 of Isobarically Control module, the first control
Signal PD_SW processed remains as 0.T at this timeDISIt can extend, until TONS/TSWLess than the upper limit (such as 0.5) CC_EN afterwards of set fixation
=1, the output PD_SW=1 with door 403, first control signal PD_SW are transferred to the first controller from second controller, thus
Realize the constant current operation of Switching Power Supply 300.
Further include third controller 227 in the embodiment of the present invention shown in Fig. 3, needs to change divider resistance according to load
225 and 226 ratio realizes quick charge so that Switching Power Supply 300 be made to need to export different voltage according to load.
In Fig. 3 embodiment that output voltage is needed with load and is changed, the polarity and first of the tertiary winding can choose
The same phase of winding (normal shock power supply), so that the supply voltage of the first controller and input voltage VINIt is directly proportional, it is unrelated with output voltage.
This power supply mode can overcome the shortcomings that polarity and the first winding reverse phase (flyback power supply) connection of traditional tertiary winding: when
When output voltage is widely varied, the supply voltage of the first controller is also widely varied.
Fig. 4 is the key node waveform diagram of Fig. 2 and Fig. 3 of the embodiment of the present invention.ISPFor secondary winding current；DET is second
The drain voltage waveform of power switch 222；TONSIt is secondary windings to the charging time of output capacitance 221；CV_EN (Gao Youxiao)
It is to stabilize the output voltage the enable signal for needing prime power switch 205 to be connected for the output of Fig. 3 Isobarically Control module 402；CC_
EN (Gao Youxiao) is the enable signal of the limitation output electric current of Fig. 3 constant-current control module 401；PD_SW is what second controller generated
The control signal that the first power switch of primary side 205 is connected, by the of short duration conducting of the second power switch by output capacitance 221
On the mode of energy transmission sub-fraction to input capacitance 202 first control signal PD_SW is transferred to primary side first
Controller 204；DRV is second controller 224 to the driving signal of the second power switch 222, including synchronous rectification driving (with
TONSBe overlapped) and control prime power switch 205 first control signal PD_SW；IPPFor peak primary currents；VS is auxiliary (the
Three) winding (polarity and armature winding reverse phase) waveform, is opened for receiving from the control prime power that second controller 224 is sent
Close the first control signal PD_SW of 205 conductings；OUT is the signal that the first controller 204 drives the first power switch 205.When
After the first control signal PD_SW that two controllers 224 generate is lower by height, the sub-fraction energy of output capacitance 221 is passed
To primary input capacitance 202, the parasitic body diode of the first power switch 205 is connected, the first controller 204 detect energy from
Output capacitance 221 drives the first power switch 205 by the switching-on state of off state after transmitting to input capacitance 202；It adopts
With method of the invention ----by the fraction energy of output capacitance 221 by the second power switch 222 and transformer to input
The mode that capacitor 202 transmits realizes control of the second controller 224 to 205 working condition of the first power switch, may be implemented the
One power switch 205 enters on state when power port voltage is essentially 0V, i.e. 205 voltage zero-cross of the first power switch is opened
It is logical, switching loss is reduced, transfer efficiency is improved.
Although, exemplary embodiment describes the present invention according to above-mentioned, it should be appreciated that, term used is explanation
With illustrative, rather than restrictive term.Since the present invention can be embodied in a variety of forms without departing from the present invention
Spirit or essence, it should therefore be appreciated that above-described embodiment is not limited to any mentioned-above detail, and should weigh
Widely understand in spirit and scope defined by benefit requirement.Therefore, whole changes in claim or its equivalent scope are fallen into
Change and remodeling is all covered by claim.
Claims (10)
1. a kind of Switching Power Supply characterized by comprising
First port is coupled to input voltage；
First capacitor device, is coupled to first port；
Transformer has the first winding and the second winding, first winding coupled to first capacitor device；
First power switch is coupled to the first winding of transformer, has two kinds of working conditions of on and off；
First controller is coupled to the first power switch and transformer；
Second port, is coupled to Switching Power Supply load, provides voltage and current to load；
Second capacitor is coupled to the second winding of second port and transformer；
Second power switch is coupled to the second winding of transformer, has two kinds of working conditions of on and off；
Second controller is coupled to the second winding of the second power switch, second port and transformer；
The second controller detects load voltage, generates the working condition that first control signal controls the first power switch, makes
Load voltage meets preset value；The method that the first control signal is transferred to the first controller by second controller are as follows: second
Controller controls the conducting and shutdown of the second power switch, and the second capacitor part energy is transmitted to first capacitor device；It is described
After first controller detects that first capacitor device obtains the energy of the second capacitor transmitting, the first power switch of control changes shape
State.
2. Switching Power Supply as described in claim 1, which is characterized in that the first port is coupled to exchange by rectification circuit
Power supply constitutes AC-DC converter.
3. such as claim 1 and Switching Power Supply as claimed in claim 2, which is characterized in that the second controller includes constant current
Control circuit is coupled to the second winding of transformer and Switching Power Supply second port；Load is flowed through in the constant-current control circuit limitation
Electric current, when the load current be greater than preset value when, forbid generate first control signal.
4. such as claim 1, claim 2 and Switching Power Supply as claimed in claim 3, which is characterized in that second control
Device includes circuit of synchronous rectification, and when energy is transmitted from first capacitor device to the second capacitor, the second power switch of control is realized
Synchronous rectification.
5. such as claim 1, claim 2, claim 3 and Switching Power Supply as claimed in claim 4, which is characterized in that institute
Stating transformer includes the tertiary winding, is coupled to the first controller；The tertiary winding polarity can be identical as the first winding polarity,
It can also be opposite with the first winding polarity；First controller receives the first control that second controller generates by the tertiary winding
Signal processed.
6. Switching Power Supply as claimed in claim 5, which is characterized in that the Switching Power Supply includes third capacitor, is coupled to
First controller and the transformer tertiary winding；The tertiary winding is identical as the first winding polarity, and the tertiary winding is third
Capacitor power supply, supply voltage is proportional to first port voltage, unrelated with second port voltage.
7. such as claim 1, claim 2, claim 3 and Switching Power Supply as claimed in claim 4, which is characterized in that the
Two controllers include constant-voltage control circuit and constant-current control circuit, and constant-voltage control circuit generates constant pressure according to the error of load voltage
Enable signal, constant-current control circuit generate constant current enable signal according to the size of load current；When load current is lower than preset value
When, constant current enable signal is effective；First control signal is generated when constant pressure enable signal and all effective constant current enable signal, it is described
First control signal is sent to the first controller by the second power switch and transformer.
8. such as claim 1 to Switching Power Supply as claimed in claim 7, which is characterized in that the first controller includes control signal
Circuit is received, transformer is coupled to；The control signal receiving circuit detects that energy is transferred to the first electricity from the second capacitor
When container, the first power switch is switched on state from off state by the first controller.
9. such as claim 1 to Switching Power Supply according to any one of claims 8, which is characterized in that the first controller includes current detecting
Circuit is coupled to the first power switch；When the electric current for flowing through the first power switch reaches the first peak point current, the first controller
First power switch is switched to off state from state.
10. such as claim 1 to Switching Power Supply as claimed in claim 9, which is characterized in that the Switching Power Supply includes third control
Device processed, is coupled to second controller and second port；The third controller changes second port electricity according to the load requirement
Pressure realizes quick charge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810013152.3A CN110011552B (en) | 2018-01-05 | 2018-01-05 | Switching power supply control method and circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810013152.3A CN110011552B (en) | 2018-01-05 | 2018-01-05 | Switching power supply control method and circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110011552A true CN110011552A (en) | 2019-07-12 |
| CN110011552B CN110011552B (en) | 2023-10-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810013152.3A Active CN110011552B (en) | 2018-01-05 | 2018-01-05 | Switching power supply control method and circuit |
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| CN (1) | CN110011552B (en) |
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| CN112019060A (en) * | 2020-08-28 | 2020-12-01 | 东莞市大忠电子有限公司 | Vehicle-mounted AC/DC quick-charging power adapter circuit |
| CN113179026A (en) * | 2021-05-17 | 2021-07-27 | 上海南芯半导体科技有限公司 | Flyback power supply circuit and control method thereof |
| CN113765387A (en) * | 2020-06-02 | 2021-12-07 | 上海芯熠微电子有限公司 | Method and apparatus for broadening voltage range of AC-DC converter |
| CN114142560A (en) * | 2021-11-29 | 2022-03-04 | 东莞新能安科技有限公司 | Protection circuit, battery management system, battery pack and electric equipment |
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| US20140268919A1 (en) * | 2013-03-13 | 2014-09-18 | Iwatt Inc. | Switching power converter with secondary to primary messaging |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113765387A (en) * | 2020-06-02 | 2021-12-07 | 上海芯熠微电子有限公司 | Method and apparatus for broadening voltage range of AC-DC converter |
| CN113765387B (en) * | 2020-06-02 | 2024-04-26 | 上海芯熠微电子有限公司 | Method and device for widening voltage range of alternating current-direct current converter |
| CN112019060A (en) * | 2020-08-28 | 2020-12-01 | 东莞市大忠电子有限公司 | Vehicle-mounted AC/DC quick-charging power adapter circuit |
| CN113179026A (en) * | 2021-05-17 | 2021-07-27 | 上海南芯半导体科技有限公司 | Flyback power supply circuit and control method thereof |
| CN114142560A (en) * | 2021-11-29 | 2022-03-04 | 东莞新能安科技有限公司 | Protection circuit, battery management system, battery pack and electric equipment |
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| CN110011552B (en) | 2023-10-03 |
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