CN207625446U - Switching power circuit - Google Patents
Switching power circuit Download PDFInfo
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- CN207625446U CN207625446U CN201721502560.2U CN201721502560U CN207625446U CN 207625446 U CN207625446 U CN 207625446U CN 201721502560 U CN201721502560 U CN 201721502560U CN 207625446 U CN207625446 U CN 207625446U
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Abstract
Provide a kind of switching power circuit, including exchange input rectification circuit, flyback switch transformer, primary-side-control chip, secondary side control chip, pulse transfer circuit and secondary side rectification circuit.Wherein：The Second terminal of flyback switch transformer and the first terminal of power switch connect, and third terminal is used as the output end of switching power circuit, the first terminal connection of forth terminal and secondary side rectification circuit；The first terminal of primary-side-control chip and the Second terminal of power switch connect, and Second terminal is connect with the first terminal of pulse transfer circuit, and third terminal connects reference ground；The Second terminal of pulse transfer circuit is connect with the first terminal that secondary side controls chip, and third terminal connects reference ground, forth terminal ground connection；The Second terminal ground connection of secondary side control chip；The first terminal of secondary side rectification circuit is connect with the forth terminal of flyback switch transformer, Second terminal ground connection.
Description
Technical field
The utility model is related to circuit fields, relate more specifically to a kind of switching power circuit.
Background technology
In recent years, as the screen of the portable equipment of such as smart mobile phone, tablet computer and laptop etc becomes
Greatly, processor becomes faster, and needs to increase the battery capacity of portable equipment to maintain or extend the usage time of portable equipment.So
And with the increase of battery capacity, battery charge time increases significantly, this is that the most users of portable equipment are not intended to see
The case where.
In order to maintain battery charge time constant or shorten battery charge time, need to increase charger and adapter
Output power.It is assisted by the fast charge of the propositions such as QualCom company, Huawei Technologies company and Taiwan company of MediaTek Inc.
The electric power output voltage of view and PD2.0, PD3.0 agreement etc. adjusts agreement to be occurred with the appearance of this demand, this
A little agreements also require higher average efficiency and smaller appearance and size other than requiring output voltage variable, it is therefore desirable to
It is controlled using synchronous rectification in secondary avris.
Currently, charger and adapter use primary-side-control scheme shown in FIG. 1 or secondary side control shown in Fig. 2 substantially
Scheme.In Fig. 1 and control program shown in Fig. 2, when load transients load or load shedding, the synchronous rectification control of secondary avris can
The primary side side and secondary avris that can lead to flyback switch transformer simultaneously turn on, to will increase the wind of switching power circuit damage
Danger.
Utility model content
In view of above-described one or more problems, the utility model provides a kind of novel switching power circuit.
Transformation is switched according to the switching power circuit of the utility model embodiment, including exchange input rectification circuit, flyback
Device, primary-side-control chip, secondary side control chip, pulse transfer circuit and secondary side rectification circuit, wherein：Exchange input rectifying
The first terminal and Second terminal of circuit are used to connect the both ends of AC power, third terminal and the first of flyback switch transformer
Terminal connects, and forth terminal connects reference ground；The first terminal of flyback switch transformer and the third end for exchanging input rectification circuit
The first terminal of son connection, Second terminal and power switch connects, output end of the third terminal as switching power circuit, and the 4th
The first terminal of terminal and secondary side rectification circuit connects；The first terminal of primary-side-control chip and the Second terminal of power switch connect
It connects, Second terminal is connect with the first terminal of pulse transfer circuit, and third terminal connects reference ground；The first end of pulse transfer circuit
Son is connect with the Second terminal of primary-side-control chip, and Second terminal is connect with the first terminal that secondary side controls chip, third terminal
Connect reference ground, forth terminal ground connection；The first terminal of secondary side control chip is connect with the Second terminal of pulse transfer circuit, and second
Terminal ground；And the first terminal of secondary side rectification circuit is connect with the forth terminal of flyback switch transformer, and Second terminal connects
Ground.
It can be to avoid the primary side side of flyback switch transformer and pair according to the switching power circuit of the utility model embodiment
The case where avris simultaneously turns on.
Description of the drawings
This practicality may be better understood from the description below in conjunction with the accompanying drawings to specific embodiment of the present utility model
It is novel, wherein：
Fig. 1 shows the block diagram of traditional switching power circuit based on primary-side-control scheme；
Fig. 2 shows the block diagrams of traditional switching power circuit based on secondary side control program；
Fig. 3 shows the circuit diagram of the switching power circuit of first embodiment according to the present utility model；
Fig. 4 A and 4B show two kinds of specific implementations of the switching power circuit of second embodiment according to the present utility model
Circuit diagram；
Fig. 5 shows the schematic block diagram of the inner function module of primary-side-control chip shown in Fig. 4 A-4B；
Fig. 6 shows the first schematic block diagram of the inner function module of secondary side control chip shown in Fig. 4 A-4B；
Fig. 7 shows the second schematic block diagram of the inner function module of secondary side control chip shown in Fig. 4 A-4B；
Fig. 8 shows the third schematic block diagram of the inner function module of secondary side control chip shown in Fig. 4 A-4B；
Fig. 9 shows the 4th schematic block diagram of the inner function module of secondary side control chip shown in Fig. 4 A-4B；
Figure 10 A to Figure 10 D show the various solutions of electromagnetic interference filter circuit shown in Fig. 4 A-4B；
Figure 11 A to Figure 11 D show that chip start-up circuit and the various of chip power supply circuit shown in Fig. 4 A-4B connect
Method；
Figure 12 A to Figure 12 H show the various connections that absorbing circuit is overshooted shown in Fig. 4 A-4B；
Figure 13 A to Figure 13 F show the various connections of secondary side rectification circuit shown in Fig. 4 A-4B；
Figure 14 A and Figure 14 B show the various connections of output filter circuit shown in Fig. 4 A-4B；
Figure 15 A and Figure 15 B show the various connections of current sampling circuit shown in Fig. 4 A-4B；
Figure 16 A to Figure 16 C show the various connections of pulse transfer circuit shown in Fig. 4 A-4B；
Figure 17 A and Figure 17 B show the various connections of voltage sampling circuit shown in Fig. 4 A-4B.
Specific implementation mode
The feature and exemplary embodiment of the various aspects of the utility model is described more fully below.It is retouched in detail in following
In stating, it is proposed that many details, in order to provide the comprehensive understanding to the utility model.But for people in the art
It will be apparent that the utility model can be implemented in the case of some details in not needing these details for member.
Below the description of embodiment is used for the purpose of providing to the more preferable of the utility model by showing the example of the utility model
Understanding.The utility model is never limited to any concrete configuration set forth below, but in the essence for not departing from the utility model
Any modification, replacement and the improvement of element and component are covered under the premise of god.In the the accompanying drawings and the following description, it is not shown
Well known structure and technology are unnecessary fuzzy to avoid causing the utility model.
Fig. 3 shows the circuit diagram of the switching power circuit of first embodiment according to the present utility model.As shown in figure 3,
Switching power circuit 300 includes exchange input rectification circuit 302, primary-side-control chip 304, secondary side control chip 306, pulse biography
Circuit 308, secondary side rectification circuit 310 and flyback switch transformer T1 are passed, wherein：
Exchanging the tool of input rectification circuit 302, there are four terminals, wherein first terminal and Second terminal are for connecting alternating current
The both ends in source, third terminal are connect with the first terminal of flyback switch transformer T1, and forth terminal connects reference ground.
There are four terminals for flyback switch transformer T1 tools, wherein first terminal and the third for exchanging input rectification circuit 302
Terminal connects, and Second terminal is connect with the first terminal of power switch Q1, and third terminal is used as the output of switching power circuit 300
End, forth terminal are connect with the first terminal of secondary side rectification circuit 310.
There are three terminals for the tool of primary-side-control chip 304, wherein and first terminal is connect with the Second terminal of power switch Q1,
Second terminal is connect with the first terminal of pulse transfer circuit 308, and third terminal connects reference ground.
There are four terminals for the tool of pulse transfer circuit 308, wherein the Second terminal of first terminal and primary-side-control chip 304
Connection, Second terminal are connect with the first terminal that secondary side controls chip 306, and third terminal connects reference ground, forth terminal ground connection.
There are two terminals for secondary side control chip 306 tool, wherein the Second terminal of first terminal and pulse transfer circuit 308
Connection, Second terminal ground connection.
There are two terminals for the tool of secondary side rectification circuit 310, wherein the forth terminal of first terminal and flyback switch transformer T1
Connection, Second terminal ground connection.
In the embodiment shown in fig. 3, the third terminal of power switch Q1 connects reference ground.
Fig. 4 A and 4B show two kinds of specific implementations of the switching power circuit of second embodiment according to the present utility model
Circuit diagram.With reference to Fig. 4 A and Fig. 4 B, the switching power circuit of second embodiment according to the present utility model is described in detail.
As can be seen from figures 4a-b, (switching power circuit 400-A and 400-B are referred to as power supply and open power switch circuit 400
Powered-down road 400) in addition to including exchange input rectification circuit 302, primary-side-control chip 304, secondary side control chip 306, pulse biography
Pass circuit 308, secondary side rectification circuit 310 (secondary side rectification circuit 310-A and 310-B are referred to as secondary side rectification circuit 310) and
Can also include electromagnetic interference filter circuit 312, overshoot absorbing circuit 314, power limit electricity other than flyback switch transformer T1
Road 316, output filter circuit 318, current sampling circuit 320, voltage sampling circuit 322, output voltage feedback circuit 324, core
One or more of piece compensation loop 326, chip power supply circuit 328, chip start-up circuit 330, system protection circuit 332 electricity
Road, wherein：
The tool of electromagnetic interference filter circuit 312 is there are three terminal, wherein first terminal and Second terminal are inputted with exchange respectively
The third terminal of rectification circuit 302 is connected with forth terminal, the first terminal of third terminal and flyback switch transformer T1 (that is,
The first terminal of the primary side winding of flyback switch transformer T1) connection.At this point, the third terminal of exchange input rectification circuit 302
No longer it is connect with the first terminal of flyback switch transformer T1.
Overshooting the tool of absorbing circuit 314, there are two terminals, wherein：First terminal and Second terminal switch transformation with flyback respectively
The first terminal and Second terminal (that is, first terminal and Second terminal of the primary side winding of flyback switch transformer T1) of device T1 is even
It connects.
There are two terminals for the tool of power limit circuit 316, wherein：The third terminal and primary side of first terminal and power switch Q1
The forth terminal connection of chip 304 is controlled, Second terminal connects reference ground.At this point, the third terminal of power switch Q1 no longer connects ginseng
Examine ground.
There are two terminals for the tool of output filter circuit 318, wherein：The third terminal of first terminal and flyback switch transformer T1
(that is, first terminal of the vice-side winding of flyback switch transformer T1) connects, Second terminal and (Fig. 4 A of secondary side rectification circuit 310
Two kinds of realization methods of secondary side rectification circuit 310 with the secondary side rectification circuit 310-A and 310-B in Fig. 4 B) Second terminal
Connection.
There are three terminals for the tool of current sampling circuit 320, wherein：The forth terminal of first terminal and flyback switch transformer T1
(that is, Second terminal of the vice-side winding of flyback switch transformer T1) connects, second with the first terminal of secondary side rectification circuit 310
Terminal is connect with the third terminal that secondary side controls chip 306, third terminal ground connection.
There are three terminals for the tool of voltage sampling circuit 322, wherein：The third terminal of first terminal and flyback switch transformer T1
The forth terminal that chip 306 is controlled with secondary side connects, and Second terminal is connect with the 5th terminal that secondary side controls chip 306, third
Terminal ground.
There are three terminals for the tool of output voltage feedback circuit 324, wherein：The third of first terminal and flyback switch transformer T1
Terminal is connected with the forth terminal that secondary side controls chip 306, and Second terminal is connect with the 6th terminal that secondary side controls chip 306,
Third terminal is grounded.
There are two terminals for the tool of chip compensation loop 326, wherein：First terminal controls the 7th terminal of chip 306 with secondary side
Connection, Second terminal ground connection.
There are three terminals for the tool of chip power supply circuit 328, wherein：5th terminal of first terminal and flyback switch transformer T1
(that is, first terminal of the auxiliary winding of flyback switch transformer T1) connects, Second terminal and the 5th of primary-side-control chip 306
Terminal connects, and third terminal connects reference ground.At this point, the 6th terminal of flyback switch transformer T1 is (that is, flyback switch transformer T1
Auxiliary winding Second terminal) connect reference ground.
There are two terminals for the tool of chip start-up circuit 330, wherein：The first terminal of first terminal and flyback switch transformer T1
Connection, Second terminal are connect with the 5th terminal of the Second terminal of chip power supply circuit 328 and primary-side-control chip 304.
There are three terminals for the tool of system protection circuit 332, wherein：The first terminal of first terminal and chip power supply circuit 328
It is connected with the 5th terminal of flyback switch transformer T1, Second terminal is connect with the 6th terminal of primary-side-control chip 304, third
Terminal connects reference ground.
In some embodiments, switching power circuit 400 can include that output voltage feedback circuit 324 and chip are mended simultaneously
Both circuits 326 are repaid, it can not also be including any one in them.That is, output voltage feedback circuit 324 and chip
Compensation loop 326 is pairs of circuit, can exist simultaneously or be not present in switching power circuit 400.
In some embodiments, switching power circuit 400 can only include current sampling circuit 320, can also wrap simultaneously
Include both current sampling circuit 320 and voltage sampling circuit 322.That is, voltage sampling circuit 322 and 320 phase of current sampling circuit
It closes, switching power circuit 400 can just further comprise voltage sampling circuit 322 under conditions of including current sampling circuit 320.
In some embodiments, when flyback switch transformer T1 includes auxiliary winding, switching power circuit 400 can be into
One step includes chip power supply circuit 328, can also further include chip start-up circuit while including chip power supply circuit 328
One or two of 330 and system protection circuit 332 circuit.Specifically, further comprise chip in switching power circuit 400
In the case that power supply circuit 328 is without including chip start-up circuit 330 and/or system protection circuit 332, chip power supply circuit
328 first terminal is with the 5th terminal of flyback switch transformer T1 (that is, the first of the auxiliary winding of flyback switch transformer T1
Terminal) it connects, Second terminal is connect with the 5th terminal of primary-side-control chip 304, and third terminal connects reference ground；In Switching Power Supply
Circuit 400 further includes the feelings of chip start-up circuit 330 and/or system protection circuit 332 while including chip power supply circuit 328
Under condition, the connection relation between them is as illustrated in figures 4 a and 4b.
It should be noted that circuit diagram shown in Fig. 4 A and Fig. 4 B differs only in, the secondary side rectification circuit in Fig. 4 A
310-A is to be realized by diode, and the secondary side rectification circuit 310-B in Fig. 4 B is realized by power switch.
Fig. 5 shows the schematic block diagram of the inner function module of primary-side-control chip shown in Fig. 4 A-4B.Such as Fig. 5 institutes
Show, primary-side-control chip 304 includes internal activation circuitry, protection signal detection circuit, pulse width modulation (PWM) circuit, mistake
Stream protection circuit, logic control circuit and the first driving circuit, wherein：Internal activation circuitry and primary-side-control chip 304
Pin A (that is, the 5th terminal), the first driving circuit and logic control circuit connection；Protection signal detection circuit and primary side control
The pin F (that is, the 6th terminal) of coremaking piece 304 is connected with logic control circuit；Pulse width modulation circuit and primary-side-control core
The pin C (that is, Second terminal) of piece 304 is connected with logic control circuit；Current foldback circuit draws with primary-side-control chip 304
Foot D (that is, forth terminal) is connected with logic control circuit；Logic control circuit and internal activation circuitry, protection signal detection electricity
Road, pulse width modulation circuit, current foldback circuit and the connection of the first driving circuit；First driving circuit and primary-side-control
Pin E (that is, first terminal), internal activation circuitry and the logic control circuit connection of chip 304；And primary-side-control core
The pin B (that is, third terminal) of piece 304 connects reference ground.
In some embodiments, the pin A to pin B of primary-side-control chip 310 is respectively：
Chip starts foot (that is, pin A), is connect with internal activation circuitry, the startup for controlling primary-side-control chip 304
With disabling；
Chip ground foot (that is, pin B), the reference ground as primary-side-control chip 304；
Pulse receives foot (that is, pin C), is connect with pulse width modulation circuit, and chip is controlled from secondary side for receiving
306, the pulse signal that is passed over via pulse transfer circuit 308；
Power limit foot (that is, pin D), connect with current foldback circuit, the original for detecting flyback switch transformer T1
Side electric current, and limit Switching Power Supply when the voltage on the primary side sampling resistor of flyback switch transformer T1 reaches given threshold
The maximum power of circuit, or enter guard mode；
Power tube drives foot (that is, pin E), for according to the pulse signal driving power switch from logic control circuit
Q1 on or off；
Foot (that is, pin F) is protected, is connect with system protection circuit, the output voltage of detection switch power circuit is used for, and
And (under-voltage) protection of overvoltage and/or short-circuit protection are realized according to the output voltage detected.
Fig. 6 to Fig. 9 shows shown in Fig. 4 A-4B that the various of the inner function module of secondary side control chip exemplary are shown
Meaning block diagram.With reference to Fig. 6 to Fig. 9, secondary side shown in detailed description Fig. 4 A-4B controls chip.
In some embodiments, as shown in fig. 6, the secondary side rectification circuit 310 in power switch circuit 400 is by diode
In the case of realizing and not including voltage sampling circuit in power switch circuit 400, secondary side control chip 306 includes in piece
Current sampling circuit, sawtooth wave generating circuit, comparator, ratio circuit, operational amplifier and the second driving circuit, wherein：
Current sampling circuit controls the pin G (that is, third terminal) of chip 306 with secondary side in piece and saw-tooth wave generating circuit is connect；Saw
Tooth wave generation circuit is connect with current sampling circuit in piece and comparator；Comparator and sawtooth wave generating circuit, ratio circuit, with
And second driving circuit connection；Ratio circuit controlled with secondary side the pin I (that is, the 7th terminal) of chip 306, operational amplifier,
And comparator connection；Operational amplifier controls the pin L (that is, the 6th terminal) and pin I of chip 306 (that is, the 7th with secondary side
Terminal), scheduled voltage and ratio circuit connection；The pin of second driving circuit and comparator and secondary side control chip 306
H (that is, first terminal) connections；Pin K (that is, Second terminal) ground connection of secondary side control chip 306；Secondary side control chip 306
Pin M (that is, forth terminal) is chip power supply and voltage sense pin.
In some embodiments, as shown in fig. 7, the secondary side rectification circuit 310 in power switch circuit 400 is by diode
In the case that realization and power switch circuit 400 include voltage sampling circuit, secondary side controls chip 306 in addition to including piece
Interior current sampling circuit, sawtooth wave generating circuit, comparator, ratio circuit, operational amplifier and the second driving circuit with
Outside, further include voltage sampling circuit in piece, wherein：Voltage sampling circuit and secondary side control the pin J of chip 306 (that is, the in piece
Five terminals) it is connected with sawtooth wave generating circuit；Current sampling circuit controls the pin G of chip 326 (that is, third with secondary side in piece
Terminal) it is connected with sawtooth wave generating circuit；Voltage sampling circuit in sawtooth wave generating circuit and piece, current sampling circuit in piece,
And comparator connection；Comparator is connect with sawtooth wave generating circuit, ratio circuit and the second driving circuit；Ratio circuit
Pin I (that is, the 7th terminal), operational amplifier and the comparator that chip 306 is controlled with secondary side are connect；Operational amplifier with
Secondary side controls pin L (that is, the 6th terminal) and pin I (that is, the 7th terminal), scheduled voltage and the ratio electricity of chip 306
Road connects；Second driving circuit is connect with the pin H (that is, first terminal) that comparator and secondary side control chip 306；Secondary side control
The pin K (that is, Second terminal) of chip 306 is grounded.
In some embodiments, as shown in figure 8, the secondary side rectification circuit 306 in power switch circuit 400 is opened by power
It closes in the case of realizing and not including voltage sampling circuit in power switch circuit 400, secondary side control chip 306 is in addition to packet
Include current sampling circuit in piece, sawtooth wave generating circuit, comparator, ratio circuit, operational amplifier and the second driving circuit
Further include third driving circuit in addition, wherein：Third driving circuit controls the pin N (that is, the 8th terminal) of chip 306 with secondary side
It connects and is connect with the second driving circuit via phase inverter, the connection relation between other circuits is identical with Fig. 6, here not
It repeats again.
In some embodiments, as shown in figure 9, the secondary side rectification circuit 306 in power switch circuit 400 is opened by power
In the case that pass is realized and power switch circuit 400 includes voltage sampling circuit, secondary side controls chip 306 in addition to including
Voltage sampling circuit in piece, current sampling circuit in piece, sawtooth wave generating circuit, comparator, ratio circuit, operational amplifier,
And second further include third driving circuit other than driving circuit, wherein：Third driving circuit controls drawing for chip 306 with secondary side
Foot N (that is, the 8th terminal) connections and connect with the second driving circuit via phase inverter, the connection relation between other circuits with
Identical in Fig. 7, which is not described herein again.
In some embodiments, the sawtooth that the output signal control sawtooth wave generating circuit of current sampling circuit generates in piece
The sawtooth wave that the rate of rise of wave, i.e. the current sampling circuit 320 obtained electric current of sampling are generated with sawtooth wave generating circuit it is upper
It is associated to rise slope；The lower drop angle for the sawtooth wave that the output signal control sawtooth wave generating circuit of voltage sampling circuit generates in piece
The voltage that the sampling of rate, i.e. voltage sampling circuit 322 obtains is related to the descending slope for the sawtooth wave that sawtooth wave generating circuit generates
Connection.
In some embodiments, the pin G to pin N of secondary side control chip 306 is respectively：
The phase is connected for the power switch Q1 in the primary side side of power switch transformer T1 in current sample foot (that is, pin G)
Between by the combination of resistance R9 or R9 and R10 come the size of the electric current of the primary side side of indirect detection power switch transformer T1,
And the rate of rise of sawtooth wave generating circuit is set；
Impulse ejection foot (that is, pin H), for via pulse transfer circuit to primary-side-control chip transfer pulse signal,
The pulse signal is used to control the conducting and cut-off of power switch Q1；
Voltage compensation foot (that is, pin I), the loop for adjusting switching power circuit have enough phase margins and gain
Nargin；
Voltage sample foot (that is, pin J) turns off the phase for the power switch Q1 in the primary side side of power switch transformer T1
Between set sawtooth wave generating circuit descending slope, to support switching power circuit to operate in CCM states or DCM states.
When switching power circuit does not include voltage sampling circuit, this foot can be not present or vacantly；
Chip ground foot (that is, pin K) controls the reference ground of chip as secondary side；
Voltage sampling foot (that is, pin L) is fed back by the closed-loop stabilization output voltage of operational amplifier with output voltage
Circuit is connected；
Chip power supply and voltage detecting foot (that is, pin M), for controlling chip power supply detection switch power supply simultaneously to secondary side
The output voltage of circuit can also give the output capacitance repid discharge in output filter circuit in some applications, with output electricity
Pressure is connected；
Rectification drives foot (that is, pin N)：For driving secondary side rectification circuit to work.In secondary side rectification circuit by two
When pole pipe is realized, this foot can be not present or vacantly.
The operation principle of secondary side control chip 306 is as follows：Voltage on divider resistance is sent by output voltage feedback circuit
The inverting input of operational amplifier obtains the output voltage of operational amplifier after compensation network；Operational amplifier it is defeated
Go out voltage by a ratio circuit adjuster, is compared with the output of saw-toothed wave generator and generates pulse width modulation
(PWM) signal is controlled；The pwm control signal is transferred to pulse by the second driver and transmits foot；Pass through pulse transfer circuit
Pwm control signal is transmitted to primary-side-control chip.
In traditional switching power circuit, the conducting and cut-off of the power switch of the primary side side of flyback switch transformer T1
By primary-side-control chip controls, the conducting of the power switch of the realization synchronous rectification of secondary avris controls chip control with cut-off by secondary side
System, primary side side, which can not be uniformly coordinated the case where causing primary side side to be simultaneously turned on pair avris with secondary avris, to be occurred.According to this reality
With in the switching power circuit of new embodiment, entire switching power circuit is controlled by secondary avris, therefore can be effective
The case where avoiding primary side side from being simultaneously turned on secondary avris occurs.
In some embodiments, exchange input rectification circuit includes fuse (FUSE) and rectifier diode, is mainly used for
Rectification is carried out to alternating voltage.Here, the minimum number of rectifier diode one, most eight；Fuse can use fuse
Resistance, wire resistor or inductance replace.
In some embodiments, electromagnetic interference filter circuit includes inductance, high-voltage electrolytic capacitor and Electro-static Driven Comb
(ESD) discharge resistance is mainly used for inhibiting electromagnetic interference and rectification post filtering.May include two inductance according to different application,
Also to include a common mode inductance；High-voltage electrolytic capacitor can also be only with one；Esd discharge resistance R1 can also in some occasions
Do not have to.Figure 10 A to Figure 10 D show the various connections of electromagnetic interference filter circuit, and R1 is esd discharge resistance, can connect and/
Or parallel connection can also be cancelled with reaching required resistance value.
In some embodiments, there are four types of connection sides according to different power supply modes for chip start-up circuit and chip power supply circuit
Formula.Figure 11 A to Figure 11 D show the various connections of chip start-up circuit and chip power supply circuit.
In some embodiments, overshoot absorbing circuit includes absorption resistance, Absorption Capacitance and unilateral diode, and Figure 12 A are extremely
Figure 12 H show the various connections of overshoot absorbing circuit.
In some embodiments, secondary side rectification circuit includes diode, power switch or diode and power switch
Combination.Figure 13 A to Figure 13 F show the various connections of secondary side rectification circuit.
In some embodiments, output filter circuit includes filter capacitor and output fictitious load two parts.For different
Output ripple requirement, output filter circuit can increase π types filter circuit or common mode filtering circuit.Figure 14 A and Figure 14 B are shown
The various connections of output filter circuit.
In some embodiments, current sampling circuit includes the resistance being connected with the vice-side winding of flyback switch transformer T1
Bleeder circuit or an independent resistance.Figure 15 A and Figure 15 B show the various connections of current sampling circuit.
In some embodiments, chip compensation loop includes the combination of resistance and capacitance, and output voltage feedback circuit includes
The resistor voltage divider circuit being connected with the voltage output end of switching power circuit.
In some embodiments, telecommunication circuit, transformer or the light that pulse transfer circuit can be implemented by Hall effect
Coupling device is realized, pulse signal is transferred to primary-side-control chip from secondary side control chip.Here, pulse transfer circuit is realized
Transformer can be transformer that the transformer with magnetic core can also be hollow.Figure 16 A to Figure 16 C show that electricity is transmitted in pulse
The various connections on road.
In some embodiments, voltage sampling circuit includes the resistance point being connected with the voltage output end of switching power circuit
Volt circuit or an independent resistance.Figure 17 A and Figure 17 B show the various connections of voltage sampling circuit 332.
Relative to traditional switching power circuit, low according to the cost of the switching power circuit of the utility model embodiment,
It is efficient, component number is few, and the case where the primary side side of flyback switch transformer can be avoided to be simultaneously turned on secondary avris.
The utility model can be realized in other specific forms, without departing from its spirit and essential characteristics.Therefore, currently
Embodiment is all counted as being exemplary rather than in all respects limited, and the scope of the utility model is by appended claims
Rather than foregoing description definition, also, fall into the meaning of claim and whole in the range of equivalent change to be wrapped
It includes in the scope of the utility model.
Claims (18)
1. a kind of switching power circuit, including exchange input rectification circuit, flyback switch transformer, primary-side-control chip, secondary side
Chip, pulse transfer circuit and secondary side rectification circuit are controlled, wherein：
The first terminal and Second terminal of the exchange input rectification circuit are used to connect the both ends of AC power, third terminal with
The first terminal of the flyback switch transformer connects, and forth terminal connects reference ground；
The first terminal of the flyback switch transformer is connect with the third terminal of the exchange input rectification circuit, Second terminal
Connect with the first terminal of power switch, third terminal be used as the switching power circuit output end, forth terminal with it is described
The first terminal of secondary side rectification circuit connects；
The first terminal of the primary-side-control chip is connect with the Second terminal of the power switch, Second terminal and the pulse
The first terminal of transfer circuit connects, and third terminal connects reference ground；
The first terminal of the pulse transfer circuit is connect with the Second terminal of the primary-side-control chip, Second terminal with it is described
The first terminal connection of secondary side control chip, third terminal connect reference ground, forth terminal ground connection；
The first terminal of the pair side control chip is connect with the Second terminal of the pulse transfer circuit, Second terminal ground connection；
And
The first terminal of the secondary side rectification circuit is connect with the forth terminal of the flyback switch transformer, and Second terminal connects
Ground.
2. switching power circuit as described in claim 1, wherein the pulse transfer circuit is led to by what Hall effect was implemented
Believe that pulse signal is transferred to the primary-side-control chip by circuit, the circuit from the secondary side control chip.
3. switching power circuit as described in claim 1, wherein the pulse transfer circuit is transformer, which will
Pulse signal is transferred to the primary-side-control chip from the secondary side control chip.
4. switching power circuit as claimed in claim 3, wherein the transformer is the transformer with magnetic core.
5. switching power circuit as claimed in claim 3, wherein the transformer is the transformer of hollow.
6. switching power circuit as described in claim 1, wherein the pulse transfer circuit is optocoupler, the optical coupler
Pulse signal is transferred to the primary-side-control chip by part from the secondary side control chip.
7. switching power circuit as described in claim 1, further includes：
Electromagnetic interference filter circuit, first terminal and Second terminal respectively with the third terminal for exchanging input rectification circuit
It is connected with forth terminal, third terminal is connect with the first terminal of the flyback switch transformer, and the exchange input is whole at this time
The third terminal of current circuit is no longer connect with the first terminal of the flyback switch transformer.
8. the switching power circuit as described in any one of claim 1 to 7, further includes：
Overshoot absorbing circuit, first terminal and the Second terminal first terminal and second with the flyback switch transformer respectively
Terminal connects.
9. switching power circuit as claimed in claim 8, further includes：
Power limit circuit, the 4th end of first terminal and the third terminal and the primary-side-control chip of the power switch
Son connection, Second terminal connect reference ground.
10. switching power circuit as claimed in claim 8, further includes：
Output filter circuit, first terminal are connect with the third terminal of the flyback switch transformer, Second terminal with it is described
The Second terminal of secondary side rectification circuit connects.
11. switching power circuit as claimed in claim 8, further includes：
Current sampling circuit, the forth terminal of first terminal and the flyback switch transformer and the secondary side rectification circuit
First terminal connects, and Second terminal is connect with the third terminal that the secondary side controls chip, third terminal ground connection.
12. switching power circuit as claimed in claim 11, further includes：
Voltage sampling circuit, first terminal control chip with the third terminal of the flyback switch transformer and the secondary side
Forth terminal connects, and Second terminal is connect with the 5th terminal that the secondary side controls chip, third terminal ground connection.
13. switching power circuit as claimed in claim 11, wherein the pair side control chip includes that sawtooth wave generates electricity
Road, the rate of rise phase for the sawtooth wave that the electric current that the current sampling circuit samples is generated with the sawtooth wave generating circuit
Association.
14. switching power circuit as claimed in claim 12, wherein the pair side control chip includes that sawtooth wave generates electricity
Road, the descending slope phase for the sawtooth wave that the voltage that the voltage sampling circuit samples is generated with the sawtooth wave generating circuit
Association.
15. switching power circuit as claimed in claim 8, further includes：
Output voltage feedback circuit, first terminal control core with the third terminal of the flyback switch transformer and the secondary side
The forth terminal of piece connects, and Second terminal is connect with the 6th terminal that the secondary side controls chip, third terminal ground connection；And
Chip compensation loop, first terminal are connect with the 7th terminal that the secondary side controls chip, Second terminal ground connection.
16. switching power circuit as claimed in claim 8, further includes：
Chip power supply circuit, first terminal are connect with the 5th terminal of the flyback switch transformer, Second terminal with it is described
5th terminal of primary-side-control chip connects, and third terminal connects reference ground.
17. switching power circuit as claimed in claim 16, further includes：
Chip start-up circuit, first terminal are connect with the first terminal of the flyback switch transformer, Second terminal with it is described
The Second terminal of chip power supply circuit is connected with the 5th terminal of the primary-side-control chip.
18. switching power circuit as claimed in claim 17, further includes：
System protection circuit, the first terminal of first terminal and the chip power supply circuit and the flyback switch transformer
5th terminal connects, and Second terminal is connect with the 6th terminal of the primary-side-control chip, and third terminal connects reference ground.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2017206219914 | 2017-05-31 | ||
| CN201720621991 | 2017-05-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207625446U true CN207625446U (en) | 2018-07-17 |
Family
ID=62828435
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721502560.2U Active CN207625446U (en) | 2017-05-31 | 2017-11-10 | Switching power circuit |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN207625446U (en) |
| TW (1) | TWM561363U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109617414A (en) * | 2018-12-07 | 2019-04-12 | 昂宝电子（上海）有限公司 | Use the switched mode power converter and its method of hall effect sensor |
| CN111355379A (en) * | 2020-03-24 | 2020-06-30 | 福州瑞芯微电子股份有限公司 | Control circuit, control method, chip and flyback converter |
| CN111769614A (en) * | 2020-07-09 | 2020-10-13 | 昂宝电子（上海）有限公司 | Detection circuit and method of quick charging system, quick charging protocol circuit and quick charging system |
| CN113839542A (en) * | 2021-09-24 | 2021-12-24 | 电子科技大学 | Peak current control circuit for on-chip current sampling |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109286321B (en) * | 2018-08-10 | 2021-02-26 | 昂宝电子（上海）有限公司 | Switching power supply circuit |
| TWI778449B (en) * | 2019-11-15 | 2022-09-21 | 美商鷹港科技股份有限公司 | High voltage pulsing circuit |
-
2017
- 2017-11-10 CN CN201721502560.2U patent/CN207625446U/en active Active
- 2017-11-10 TW TW106216700U patent/TWM561363U/en unknown
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109617414A (en) * | 2018-12-07 | 2019-04-12 | 昂宝电子（上海）有限公司 | Use the switched mode power converter and its method of hall effect sensor |
| TWI693779B (en) * | 2018-12-07 | 2020-05-11 | 大陸商昂寶電子（上海）有限公司 | Switch mode power converter using Hall effect sensor and its method |
| US20200186050A1 (en) * | 2018-12-07 | 2020-06-11 | On-Bright Electronics (Shanghai) Co., Ltd. | Switch-mode power converters using hall effect sensors and methods thereof |
| US11316442B2 (en) | 2018-12-07 | 2022-04-26 | On-Bright Electronics (Shanghai) Co., Ltd. | Switch-mode power converters using hall effect sensors and methods thereof |
| US11581819B2 (en) | 2018-12-07 | 2023-02-14 | On-Bright Electronics (Shanghai) Co., Ltd. | Switch-mode power converters using hall effect sensors and methods thereof |
| CN111355379A (en) * | 2020-03-24 | 2020-06-30 | 福州瑞芯微电子股份有限公司 | Control circuit, control method, chip and flyback converter |
| CN111769614A (en) * | 2020-07-09 | 2020-10-13 | 昂宝电子（上海）有限公司 | Detection circuit and method of quick charging system, quick charging protocol circuit and quick charging system |
| CN113839542A (en) * | 2021-09-24 | 2021-12-24 | 电子科技大学 | Peak current control circuit for on-chip current sampling |
| CN113839542B (en) * | 2021-09-24 | 2023-05-26 | 电子科技大学 | Peak current control circuit for on-chip current sampling |
Also Published As
| Publication number | Publication date |
|---|---|
| TWM561363U (en) | 2018-06-01 |
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