CN108880296A - power conversion system - Google Patents
power conversion system Download PDFInfo
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- CN108880296A CN108880296A CN201810601234.XA CN201810601234A CN108880296A CN 108880296 A CN108880296 A CN 108880296A CN 201810601234 A CN201810601234 A CN 201810601234A CN 108880296 A CN108880296 A CN 108880296A
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- voltage
- state
- controller chip
- pwm controller
- pwm
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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
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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
- H02M3/33507—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 with automatic control of the output voltage or current, e.g. flyback converters
Abstract
Provide a kind of power conversion system, including transformer, bipolar junction transistor BJT and PWM controller chip PWM IC, wherein after power conversion system enters closed loop states, inside PWM IC：The output characterization voltage of current detection voltage and characterization DC output voltage that the electric current of the primary side winding of transformer is flowed through based on characterization generates the first and second control signals；The conducting and shutdown of the first and second power switch, and conducting and shutdown based on second control signal control third power switch are controlled based on first control signal, wherein：When the first and second power switch become an OFF state from state but third power switch is in an off state, PWM IC control BJT is in the conductive state, so that the DC input voitage that AC-input voltage is obtained through over commutation and filtering is connected to the capacitor charging of the Second terminal of PWM IC via the diode pair being connected between its first and second terminal inside the primary side winding of transformer, BJT, the first terminal of PWM IC, PWM IC.
Description
Technical field
The present invention relates to circuit fields, relate more specifically to a kind of power conversion system.
Background technique
Fig. 1 is the circuit diagram of traditional inverse-excitation type exchange (AC)-direct current (DC) power conversion system.As shown in Figure 1, traditional
AC-DC power conversion system process that ac input voltage is converted into DC output voltage it is as follows：
Ac input voltage is by electromagnetic interference (EMI) filter and the rectifier (rectifier bridge including four diodes composition
With body capacitance (bulk capacitor)) filtering and rectification after become DC input voltage VIN；DC input voltage VIN passes through start-up resistor
Rst charges to the capacitor C1 between the VDD terminal and benchmark for being connected to PWM controller chip (PWM IC)；As capacitor C1
On voltage (that is, voltage at VDD terminal) be higher than PWM IC under-voltage locking (UVLO) voltage when, PWM IC start to work；
PWM IC, which controls bipolar junction transistor (BJT), becomes on state from off state, so that the primary side winding Np of transformer T1 is stored up
The energy of DC input voltage VIN offer is deposited, the electric current for flowing through the primary side winding Np of transformer T1 is linearly increasing；PWM IC is via CS
Terminal is based on the current detecting electricity on the current sense resistor Rs being connected between the primary side winding Np of transformer T1 and benchmark
It presses to detect the electric current for the primary side winding Np for flowing through transformer T1 (because the current detection voltage on current sense resistor Rs can
Characterization flows through the electric current of the primary side winding Np of transformer T1)；When the electric current for the primary side winding Np for flowing through transformer T1 reaches predetermined
Current threshold is (that is, the voltage at current detection voltage/CS terminal reaches the voltage at FB terminal/output characterization voltage/inside most
High clamped voltage Vocp) when, PWM IC control bipolar junction transistor (BJT) becomes an OFF state from state；When ambipolar
When transistor (BJT) is in an off state, the energy stored in the primary side winding Np of transformer T1 is discharged into the pair of transformer T1
Side winding Ns；The filter rectification group that voltage on the vice-side winding Ns of transformer T1 is formed by diode D1 and output capacitance C0
Become DC output voltage VO after the filtering and rectification of part；DC output voltage VO gradually rises；TL431 is based on resistance R1 and R0 to DC
The output that output voltage VO is divided characterizes voltage detecting DC output voltage VO, and reaches predetermined in DC output voltage VO
FB terminal of the characterization Voltage Feedback to PWM IC will be exported by optocoupler when voltage threshold；PWM IC is based on output characterization voltage control
Bipolar junction transistor (BJT) processed becomes on state from off state, to stablizing DC output voltage VO in predetermined voltage threshold
Value.
Fig. 2 is the internal circuit diagram of PWM IC shown in FIG. 1.As shown in Fig. 2, FB terminal is via upper inside PWM IC
Pull-up resistor Rfb is connected to voltage AVDD；Voltage quilt when DC output voltage VO does not reach predetermined voltage threshold, at FB terminal
Pull-up resistor Rfb is pulled upward to voltage AVDD, and voltage (that is, current detection voltage) of the PWM IC at CS terminal reaches internal highest
Bipolar junction transistor (BJT) is controlled when clamped voltage Vocp to become an OFF state from state；When DC output voltage VO reaches
When predetermined voltage threshold, power conversion system shown in FIG. 1 enters closed loop states, and the voltage at FB terminal is (that is, output characterization electricity
Pressure) it is lower than the clamped voltage Vocp of internal highest, voltage (that is, current detection voltage) of the PWM IC at CS terminal reaches FB terminal
Control bipolar junction transistor (BJT) becomes an OFF state from state when voltage (that is, the output characterization voltage) at place.
After power conversion system shown in Fig. 1 enters closed loop states, the auxiliary winding Naux of transformer T1 is via two poles
The shortcomings that pipe D2 and capacitor C1 is that PWM IC powers, this power supply mode is to need the additional auxiliary winding Naux for increasing transformer T1
With diode D2 connected to it, the complexity of transformer is increased to increase system cost.
Summary of the invention
It, can be with the present invention provides a kind of novel power conversion system in view of above-described one or more problems
Save transformer auxiliary winding and diode connected to it, reduce the complexity of transformer to save system cost.
Power conversion system according to an embodiment of the present invention, for AC-input voltage to be converted to DC output voltage,
Including transformer, bipolar junction transistor and PWM controller chip, wherein enter closed loop states in power conversion system
Afterwards, inside PWM controller chip：
The current detection voltage of the electric current of the primary side winding of transformer is flowed through based on characterization and characterizes DC output voltage
Output characterization voltage generates first control signal and second control signal；
Based on the conducting and shutdown of first control signal control the first power switch and the second power switch, and it is based on second
The conducting and shutdown of signal control third power switch are controlled, wherein：
When the first power switch and the second power switch are on state and third power switch is off shape
When state, PWM controller chip, which controls bipolar junction transistor, becomes on state from off state, so that transformer starts to store up
Energy；
When the first power switch and the second power switch become an OFF state from state but third power switch still
When so in an off state, PWM controller chip controls bipolar junction transistor still on state, so that exchange input
The DC input voitage that voltage is obtained through over commutation and filtering is via the primary side winding of transformer, bipolar junction transistor, pulsewidth tune
The first terminal for being connected to PWM controller chip inside the system control first terminal of chip, PWM controller chip and
The Second terminal for being connected to PWM controller chip outside diode pair PWM controller chip between Second terminal
Capacitor charging；
When third power switch becomes on state from off state, PWM controller chip controls bipolar transistor
Pipe becomes an OFF state from state, so that DC input voitage is connected to pulsewidth tune to outside PWM controller chip
The charging of the capacitor of the Second terminal of system control chip terminates.
Power conversion system according to an embodiment of the present invention uses novel power supply mode as PWM controller chip
Power supply, can save transformer auxiliary winding and diode connected to it, make and save and be so as to simplify transformer
System cost.
Detailed description of the invention
The present invention may be better understood from the description with reference to the accompanying drawing to a specific embodiment of the invention,
In：
Fig. 1 is the circuit diagram of traditional inverse-excitation type AC-DC power conversion system；
Fig. 2 is the internal circuit diagram of PWM IC shown in FIG. 1；
Fig. 3 is the circuit diagram of the inverse-excitation type AC-DC power conversion system of secondary side feedback control according to an embodiment of the present invention；
Fig. 4 is the internal circuit diagram of PWM IC shown in Fig. 3；
Fig. 5 is the internal circuit diagram of PWM control unit shown in Fig. 4；
Fig. 6 is the timing diagram of the signal and some internal signals at some terminals of PWM IC shown in Fig. 3；
Fig. 7 is the circuit diagram that diode D3 shown in Fig. 4 is realized with PMOS；
Fig. 8 is the inverse-excitation type AC-DC power supply conversion using the primary side feedback control of the working principle PWM IC similar with Fig. 4
The circuit diagram of system；
Fig. 9 is the internal circuit diagram of the PWM control unit in PWM IC shown in Fig. 8；
Figure 10 is the circuit diagram of the AC-DC power conversion system of the forward direction framework of PWM IC shown in Fig. 4.
Specific embodiment
The feature and exemplary embodiment of various aspects of the invention is described more fully below.In following detailed description
In, many details are proposed, in order to provide complete understanding of the present invention.But to those skilled in the art
It will be apparent that the present invention can be implemented in the case where not needing some details in these details.Below to implementation
The description of example is used for the purpose of providing by showing example of the invention and better understanding of the invention.The present invention never limits
In any concrete configuration set forth below, but cover under the premise of without departing from the spirit of the present invention element, component and
Any modification, replacement and the improvement of algorithm.In the the accompanying drawings and the following description, well known structure and technology is not shown, so as to
It avoids causing the present invention unnecessary fuzzy.
Fig. 3 shows the electricity of the inverse-excitation type AC-DC power conversion system of secondary side feedback control according to an embodiment of the present invention
Lu Tu.As shown in figure 3, ac input voltage is converted to DC output electricity by AC-DC power conversion system according to an embodiment of the present invention
The process of pressure is as follows：
Ac input voltage is by electromagnetic interference (EMI) filter and the rectifier (rectifier bridge including four diodes composition
With body capacitance (bulk capacitor)) filtering and rectification after become DC input voltage VIN；DC input voltage VIN passes through start-up resistor
Rst powers to the base stage of bipolar junction transistor (BJT), so that bipolar junction transistor (BJT) becomes on state from off state；
DC input voltage VIN inside the primary side winding Np, bipolar junction transistor (BJT) and PWM IC of transformer T1 by being connected to
Diode D3 between SW terminal and VDD terminal charges to the capacitor C1 for being connected to VDD terminal outside PWM IC；As capacitor C1
On under-voltage locking (UVLO) voltage more than PWM IC of voltage (that is, voltage at VDD terminal) when, PWM IC starts to work；
The energy that the primary side winding Np storage DC input voltage VIN of transformer T1 provides, flows through the electricity of the primary side winding Np of transformer T1
Cleanliness increases；PWM IC is via CS terminal based on the current detecting between the bulk capacitor being connected in rectifier and benchmark
Current detection voltage on resistance Rs detects the electric current for the primary side winding Np for flowing through transformer T1 (because of current sense resistor Rs
On current detection voltage can characterize the electric current for flowing through the primary side winding Np of transformer T1)；When the primary side for flowing through transformer T1
The electric current of winding Np reaches predetermined current threshold (that is, the reverse voltage of the voltage at current detection voltage/CS terminal reaches the end FB
Son place voltage/output characterize voltage/clamped voltage Vocp of inside highest) when, PWM IC control bipolar junction transistor (BJT) from
On state becomes an OFF state；When bipolar junction transistor (BJT) is in an off state, in the primary side winding Np of transformer T1
The energy of storage is discharged into the vice-side winding Ns of transformer T1；Voltage on the vice-side winding Ns of transformer T1 passes through diode D1
Become DC output voltage VO after filtering and rectification with the filter rectification component of output capacitance C0 composition；DC output voltage VO is gradually
It increases；The output characterization voltage detecting DC output electricity that TL431 divides DC output voltage VO based on resistance R1 and R0
VO is pressed, and FB of the characterization Voltage Feedback to PWM IC will be exported by optocoupler when DC output voltage VO reaches predetermined voltage threshold
Terminal, so that PWM IC, which is based on output characterization voltage control bipolar junction transistor (BJT), becomes on state from off state, from
And DC output voltage VO is stablized in predetermined voltage threshold.
Fig. 4 is the internal circuit diagram of PWM IC shown in Fig. 3.As shown in figure 4, FB terminal is via upper inside PWM IC
Pull-up resistor Rfb is connected to voltage AVDD；Voltage quilt when DC output voltage VO does not reach predetermined voltage threshold, at FB terminal
Pull-up resistor Rfb is pulled upward to voltage AVDD, and the reverse voltage of voltage (that is, current detection voltage) of the PWM IC at CS terminal reaches
Bipolar junction transistor (BJT) is controlled when voltage Vocp clamped to internal highest to become an OFF state from state；When DC is exported
When voltage VO reaches predetermined voltage threshold, power conversion system shown in Fig. 3 enters closed loop states, and the voltage at FB terminal is lower than
The reverse voltage of the voltage (that is, current detection voltage) of the internal clamped voltage Vocp of highest, PWM IC at CS terminal reaches FB
Control bipolar junction transistor (BJT) becomes an OFF state from state when voltage (that is, output characterization voltage) at terminal.
After power conversion system shown in Fig. 4 enters closed loop states, CS terminal of the PWM control unit based on PWM IC and
Voltage (that is, current detection voltage and output characterization voltage) at FB terminal generates pwm signal and pwm_pre signal, with control
The conducting and shutdown of power switch M0 to M2 is to control the conducting and shutdown of bipolar junction transistor (BTJ)；Power switch M0 exists
Pwm_pre signal is in the conductive state when being high level, and in an off state when pwm_pre signal is low level；Power
Switch M1 is in an off state when pwm signal is high level, and in the conductive state when pwm signal is low level；Power
Switch M2 is in the conductive state when pwm_pre signal is high level, and is off shape when pwm_pre signal is low level
State；When power switch M0 and M2 are on state and power switch M1 in an off state, Ibase driving current control
Bipolar junction transistor (BJT) outside PWM IC processed becomes on state from off state, so that transformer T1 starts energy storage；
Ibase driving current increases with the increase of the electric current for the primary side winding Np for flowing through transformer T1；When power switch M0 and M2 from
On state becomes an OFF state but power switch M1 is when being still within off state, bipolar junction transistor (BJT) still in
On state, DC input voltage VIN is by the primary side winding Np of transformer T1, the end SW of bipolar junction transistor (BJT), PWM IC
Son and diode D3 charge to the capacitor C1 for the VDD terminal for being connected to PWM IC, and transformer T1 is in energy storage shape at this time
State, the electric current for flowing through the primary side winding Np of transformer T1 continue to increase；When power switch M1 becomes on state from off state
When, Ibase driving current is no longer flow towards the bipolar junction transistor (BJT) outside PWM IC, and bipolar junction transistor (BJT) is from conducting
State becomes an OFF state, and terminates to the charging of the capacitor C1 for the VDD terminal for being connected to PWM IC, at this time the primary side of transformer T1
The energy of winding Np storage is discharged into the vice-side winding Ns of transformer T1.
Fig. 5 is the timing diagram of the signal and some internal signals at some terminals of PWM IC shown in Fig. 3.Fig. 6 is
The internal circuit diagram of PWM control unit shown in Fig. 4.As shown in Figure 5 and Figure 6, the clock signal that pwm signal is generated in oscillator
Rising edge from low level become high level when arriving, the voltage at the CS terminal (that is, current detection voltage) of PWM IC
When reverse voltage reaches voltage (that is, output characterization voltage) at the FB terminal of PWM IC or internal highest clamped voltage Vocp from
High level becomes low level, until oscillator generate clock signal next clock cycle rising edge arrive when again from
Low level becomes high level；Pwm_pre signal becomes when the rising edge for the clock signal that oscillator generates arrives from low level
The reverse voltage of high level, the voltage (that is, current detection voltage) at the CS terminal of PWM IC is superimposed bias voltage Voffset
Become when reaching the voltage (that is, output characterization voltage) at the FB terminal of PWM IC or the clamped voltage Vocp of internal highest from high level
For low level, until the clock signal that oscillator generates becomes from low level again when the rising edge of next clock cycle arrives
For high level.
Here, the reverse voltage of the voltage due to pwm_pre signal at the CS terminal of PWM IC is superimposed bias voltage
Become low level from high level when Voffset reaches voltage at the FB terminal of PWM IC or internal highest clamped voltage Vocp
Pwm_pre signal, therefore become low level from high level in advance than pwm signal.
In PWM IC shown in Fig. 4, comparator 1 divide to the voltage at VDD terminal based on resistance R2 and R3
Voltage is characterized to power supply, and exports high level when power supply characterization voltage is more than supply voltage threshold value, so that power switch M1
Become on state to make bipolar junction transistor (BJT) become an OFF state from state, to prevent VDD from off state
Voltage (that is, voltage at VDD terminal) on the capacitor C1 of terminal connection is filled Tai Gao and damages PWM IC.
Auxiliary winding and connected to it two pole of the power conversion system according to an embodiment of the present invention without transformer T1
Pipe, can be realized the PWM modulation process in the function of supplying power and traditional power conversion system to PWM IC, therefore simplify
System design saves system cost.
Those skilled in the art should be it is contemplated that diode D3 shown in Fig. 4 can be substituted with PMOS.Fig. 7 is Fig. 4
Shown in the circuit diagram realized with PMOS of diode D3.In Fig. 7, the conducting and shutdown of PMOS is by pwm signal and pwm_pre
Signal co- controlling.
Fig. 8 is the AC-DC power conversion system using the primary side feedback control of the working principle PWM IC similar with Fig. 4
Circuit diagram.Fig. 9 is the internal circuit diagram of the PWM control unit in PWM IC shown in Fig. 8.PWM control unit shown in Fig. 9 with
The difference of PWM control unit shown in fig. 6 is：The detection module that demagnetizes is generated based on the voltage at the FB terminal of PWM IC to be characterized
The demagnetization platform voltage of the size of DC output voltage VO, sampling module sample demagnetization platform voltage and remain on capacitor C0,
Error amplification signal vcomp is generated by error amplifier EA, this vcomp voltage is equal at the FB terminal of the PWM IC in Fig. 4
Voltage ,-vcomp is bigger, and expression output load current is bigger, and the smaller expression output load current of vcomp is smaller.
Fig. 9 is the circuit diagram using the AC-DC power conversion system of the forward direction framework of PWM IC shown in Fig. 4.Here,
The working principle of PWM IC is just the same with combination Fig. 4 and Fig. 5 description, so repeating no more.
The present invention can realize in other specific forms, without departing from its spirit and essential characteristics.For example, particular implementation
Algorithm described in example can be modified, and system architecture is without departing from essence spirit of the invention.Therefore, currently
Embodiment be all counted as being exemplary rather than in all respects it is limited, the scope of the present invention by appended claims rather than
Foregoing description definition, also, the meaning of claim and whole changes in the range of equivalent are fallen into all be included in
Among the scope of the present invention.
Claims (9)
1. a kind of power conversion system, for AC-input voltage to be converted to DC output voltage, including it is transformer, ambipolar
Transistor and PWM controller chip, wherein after the power conversion system enters closed loop states, in the pulsewidth
Modulation control chip interior：
The current detection voltage of the electric current of the primary side winding of the transformer is flowed through based on characterization and characterizes the direct current output electricity
The output characterization voltage of pressure generates first control signal and second control signal；
Based on the conducting and shutdown of first control signal control the first power switch and the second power switch, and based on described
Second control signal controls the conducting and shutdown of third power switch, wherein：
When first power switch and second power switch are on state and the third power switch
When off state, the PWM controller chip, which controls the bipolar junction transistor, becomes on state from off state,
So that the transformer starts energy storage；
When first power switch and second power switch becomes an OFF state from state but the third function
When rate switch is still within off state, the PWM controller chip controls the bipolar junction transistor still in conducting shape
State so that the AC-input voltage through over commutation and the obtained DC input voitage of filtering via the transformer primary side around
Group, the bipolar junction transistor, the first terminal of the PWM controller chip, inside the PWM controller chip
It is connected to pulse width modulation controlled described in the diode pair between the first terminal and Second terminal of the PWM controller chip
The capacitor charging of the Second terminal for being connected to the PWM controller chip of chip exterior；
When the third power switch becomes on state from off state, the PWM controller chip control is described double
Bipolar transistor becomes an OFF state from state so that the DC input voitage to the PWM controller chip outside
The charging of the capacitor of the Second terminal for being connected to the PWM controller chip in portion terminates.
2. power conversion system as described in claim 1, wherein inside the PWM controller chip：
Clock signal is generated by oscillator；
The first control signal becomes high level from low level when the rising edge of the clock signal arrives, in the electric current
The reverse voltage of detection voltage reaches the clamped electricity of highest inside the output characterization voltage or the PWM controller chip
Become low level from high level when pressure, until the clock signal next clock cycle rising edge arrive when again from low
Level becomes high level；
The second control signal becomes high level from low level when the rising edge of the clock signal arrives, in the electric current
From high electric when the reverse voltage superposition bias voltage of detection voltage reaches output characterization voltage or the highest clamped voltage
It is flat to become low level, until the clock signal becomes high from low level again when the rising edge of next clock cycle arrives
Level.
3. power conversion system as described in claim 1, wherein before PWM controller chip work：
Base stage of the DC input voitage by start-up resistor to the bipolar junction transistor is powered, so that the ambipolar crystalline substance
Body pipe becomes on state from off state, the DC input voitage via the transformer primary side winding, described bipolar
Transistor npn npn, the first terminal of the PWM controller chip, inside the PWM controller chip be connected to it is described
Outside PWM controller chip described in diode pair between the first terminal and Second terminal of PWM controller chip
It is connected to the capacitor charging of the Second terminal of the PWM controller chip；
On the capacitor of the Second terminal for being connected to the PWM controller chip outside the PWM controller chip
Voltage when being more than the under-voltage locking voltage of the PWM controller chip, the PWM controller chip is started to work.
4. power conversion system as described in claim 1, wherein the PWM controller chip is in the direct current output electricity
When pressure does not reach predetermined voltage threshold, reach the PWM controller chip in the reverse voltage of the current detection voltage
The bipolar junction transistor is controlled when the clamped voltage of internal highest to become an OFF state from state；In the direct current output
When voltage reaches the predetermined voltage threshold, when the reverse voltage of the current detection voltage reaches the output characterization voltage
The bipolar junction transistor is controlled to become an OFF state from state.
5. power conversion system as described in claim 1, wherein inside the PWM controller chip, by institute
It states the voltage at the Second terminal of PWM controller chip to be divided to obtain power supply characterization voltage, and in the watt-hour meter
Sign voltage, which controls the third power switch when being more than power supply threshold voltage, becomes on state from off state, so that described double
Bipolar transistor becomes an OFF state from state.
6. power conversion system as described in claim 1, wherein being connected to inside the PWM controller chip is described
Diode between the first terminal and Second terminal of pulse width modulating chip is replaced by the 4th power switch, and the described 4th
The conducting and shutdown of power switch are controlled by the first control signal and the second control signal.
7. power conversion system as described in claim 1, wherein the power conversion system is the flyback of secondary side feedback control
Formula power conversion system.
8. power conversion system as described in claim 1, wherein the power conversion system is preceding to the conversion of the power supply of framework
System.
9. power conversion system as described in claim 1, the power conversion system is the inverse-excitation type electricity of primary side feedback control
Source converting system.
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| CN201810601234.XA CN108880296B (en) | 2018-06-12 | 2018-06-12 | Power supply conversion system |
| TW107125238A TWI657653B (en) | 2018-06-12 | 2018-07-20 | Power conversion system |
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|---|---|---|---|
| CN201810601234.XA CN108880296B (en) | 2018-06-12 | 2018-06-12 | Power supply conversion system |
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Cited By (10)
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| CN112821727A (en) * | 2021-03-11 | 2021-05-18 | 昂宝电子（上海）有限公司 | Switching power supply system |
| CN112838772A (en) * | 2021-01-18 | 2021-05-25 | 昂宝电子（上海）有限公司 | Flyback switching power supply and control method thereof |
| CN113394983A (en) * | 2021-07-01 | 2021-09-14 | 上海南芯半导体科技有限公司 | Voltage feedback circuit of flyback converter and control method thereof |
| CN113541444A (en) * | 2020-04-15 | 2021-10-22 | 芯好半导体(成都)有限公司 | Current recovery circuit, switch converter and integrated circuit |
| CN114244153A (en) * | 2021-11-23 | 2022-03-25 | 昂宝电子（上海）有限公司 | Switching power supply and control chip and control method thereof |
| CN114285249A (en) * | 2021-12-06 | 2022-04-05 | 昂宝电子（上海）有限公司 | Switching power supply and control chip and control method thereof |
| US11581815B2 (en) | 2012-04-12 | 2023-02-14 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for regulating power conversion systems with output detection and synchronized rectifying mechanisms |
| US11588405B2 (en) | 2012-04-12 | 2023-02-21 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for regulating power conversion systems with output detection and synchronized rectifying mechanisms |
| US11757366B2 (en) | 2020-05-29 | 2023-09-12 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for synchronous rectification of power supply systems |
| US11764697B2 (en) | 2020-01-20 | 2023-09-19 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for controlling synchronous rectification |
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| US11764697B2 (en) | 2020-01-20 | 2023-09-19 | On-Bright Electronics (Shanghai) Co., Ltd. | Systems and methods for controlling synchronous rectification |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN108880296B (en) | 2021-01-05 |
| TWI657653B (en) | 2019-04-21 |
| TW202002494A (en) | 2020-01-01 |
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