CN206894526U - A kind of reverse exciting switching voltage regulator - Google Patents
A kind of reverse exciting switching voltage regulator Download PDFInfo
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- CN206894526U CN206894526U CN201720331741.7U CN201720331741U CN206894526U CN 206894526 U CN206894526 U CN 206894526U CN 201720331741 U CN201720331741 U CN 201720331741U CN 206894526 U CN206894526 U CN 206894526U
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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
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- 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
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Abstract
The utility model discloses a kind of reverse exciting switching voltage regulator, including：Input filter rectification circuit, flyback on-off circuit, output voltage rectification circuit, feedback sample circuit, control circuit, power supply circuit, current sample and compensation circuit；Flyback on-off circuit electrically connects with input filter rectification circuit, output voltage rectification circuit, control circuit, power supply circuit, current sample and compensation circuit respectively, input filter rectification circuit also electrically connects with control circuit, current sample and compensation circuit, output voltage rectification circuit also electrically connects with feedback sample circuit, and control circuit also electrically connects with feedback sample circuit, current sample and compensation circuit, power supply circuit respectively.Reverse exciting switching voltage regulator of the present utility model, the high precision int of current sample can be realized, error range is small, in the case where change range of input voltage is very big, also the uniformity of flow point can be realized, the load capacity of Switching Power Supply is not influenceed, in addition, this reverse exciting switching voltage regulator high conversion efficiency, stand-by power consumption are low, stability is good and cost is relatively low.
Description
Technical field
It the utility model is related to power-supply system, more particularly to a kind of reverse exciting switching voltage regulator.
Background technology
In field of switch power, reverse exciting switching voltage regulator is simple with it, and efficiently, the advantages that cost is cheap is particularly suitable for small work(
Rate Switching Power Supply, but many difficult points in the design process of reverse exciting switching voltage regulator be present.A kind of typical flyback switching electricity
Source circuit, it includes primary loop, secondary commutation loop and secondary feedback control loop, power switch pipe control chip and work(
Rate pipe MOSFET.Wherein primary magnetizing inductance, secondary inductance collectively form the transformer of system.Power tube switch control chip is determined
ON time and the deadline in power tube MOSFET each cycles are determined, output are delivered to by flyback transformer so as to control
The energy at end.Input exchange signal filters out differential mode and common mode disturbances by EMI circuits, and carries out after rectification as the defeated of system
Enter voltage, in a cycle of MOSFET work, when closed, primary flows through electric current, and energy storage is in excitation electricity
In sense, secondary commutation pipe is off, no-load transformer work；When turned off, the energy of static exciter inductance storage is released
Put, pass to secondary, DC voltage is exported after over commutation and filtering.Inverse excitation type converter then completes the storage of a cycle
Can, the process of transformation and energy transmission.
In inverse-excitation type switch power-supply, in addition to the Voltage Feedback design of output voltage is extremely important, power switch pipe
Control chip current sampling inner looping feedback and the link that plays a decisive role of Switching Power Supply design, if current sample
Precision is not high, inaccurate, can also have a strong impact on the size of power output, and then have influence on the load capacity of Switching Power Supply.
The content of the invention
The utility model provides a kind of reverse exciting switching voltage regulator, it is possible to achieve the high accuracy words of current sample, error range
It is small, in the case where change range of input voltage is very big, the uniformity of flow point can be also realized, the band for not influenceing Switching Power Supply carries
Ability.
Reverse exciting switching voltage regulator provided by the utility model, including：Input filter rectification circuit, flyback on-off circuit, output
Voltage rectifying circuit, feedback sample circuit, control circuit, power supply circuit, current sample and compensation circuit；The flyback switch electricity
Road respectively with the input filter rectification circuit, output voltage rectification circuit, control circuit, power supply circuit, current sample and benefit
Circuit electrical connection is repaid, the input filter rectification circuit also electrically connects with the control circuit, current sample and compensation circuit, institute
Output voltage rectification circuit is stated also to electrically connect with the feedback sample circuit, the control circuit also respectively with the feedback sample
Circuit, current sample and compensation circuit, power supply circuit electrical connection；
The alternating current of alternating current source output passes through the input filter rectification circuit, flyback on-off circuit, output voltage rectification
Required DC voltage is obtained after circuit, the power supply circuit provides operating voltage, the control circuit to the control circuit
The current information that feedback voltage information, the current sample and the compensation circuit gathered according to the feedback sample circuit gathers is adjusted
Whole pulse dutycycle, control the break-make of the switching tube of the flyback on-off circuit so that the flyback of the flyback on-off circuit becomes
Depressor exports burning voltage.
Further, the control circuit includes control chip, and the control chip includes：
The zero current detection protection pin of the control chip, is become by the flyback in resistance R9 and the flyback on-off circuit
The assists winding electrical connection of depressor, the zero current detection protect pin by being grounded after electric capacity C5；The feedback of the control chip
Input pin, electrically connected with the output end of the feedback sample circuit；The current sample input pin of the control chip, with the electricity
Stream sampling and the output end electrical connection of compensation circuit；The high input voltage pin of the control chip, by some resistance of series connection with
The output end electrical connection of the input filter rectification circuit；The supply input pin of the control chip, with the power supply circuit
Output end electrically connects, and the supply input pin after electric capacity C7 by being grounded；The driving pin of the control chip, is opened with the flyback
The gate terminal electrical connection of switching tube in powered-down road.
Further, the flyback on-off circuit includes：Flyback transformer, switching tube；The drain electrode end of the switching tube with
The first end electrical connection of the armature winding of the flyback transformer, the source terminal of the switching tube pass through current sampling resistor RS1
After be grounded, the gate terminal of the switching tube electrically connects with the driving pin of the control chip of the control circuit；The switching tube
Electrically connected between source class end and gate terminal by resistance R8；The first end of the assists winding of the flyback transformer and the power supply
Circuit electrically connects；The first end of the assists winding of the flyback transformer by after the resistance R9 with the control chip zero
Current detecting protection pin electrical connection；The first end of the secondary windings of the flyback transformer and the output voltage rectification circuit
Input electrically connects, the second end ground connection of the secondary windings of the flyback transformer.
Further, the current sample and compensation circuit include：Resistance R10, divider resistance R11, divider resistance R12,
And the low pass filter being made up of resistance R13 and electric capacity C6 parallel connections；One end of the resistance R10 and the flyback transformer
The source class end electrical connection of switching tube, the current sample of the other end and the control chip of the control circuit of the resistance R10 are defeated
Enter pin electrical connection；The output end of the input filter rectification circuit passes sequentially through the divider resistance R11, the divider resistance
R12 electrically connects with the current sample input pin of the control chip of the control circuit, one end of the LPF electrical equipment and institute
State the current sample input pin electrical connection of the control chip of control circuit, the other end ground connection of the low pass filter.
Further, the reverse exciting switching voltage regulator also includes leakage inductance energy absorbing circuit, the leakage inductance energy absorbing circuit
It is arranged between first end and the second end of the armature winding of the flyback transformer of the flyback on-off circuit.
Further, the reverse exciting switching voltage regulator also includes drive circuit, the input of the drive circuit and the control
The driving pin electrical connection of the control chip of circuit processed, the output end of the drive circuit and the switching tube of the flyback on-off circuit
Gate terminal electrical connection.
Further, the input filter rectification circuit includes：Electromagnetic interface filter, the bridge-type being made up of four diodes are whole
Current circuit, storage capacitor C1, thermistor RT；Electromagnetic interface filter, the input of the electromagnetic interface filter and the output of AC power
End electrical connection, the electromagnetic interface filter include：Fuse F1, piezo-resistance RV1, electric capacity CY1, electric capacity CY2, resistance R1, resistance
R2, electric capacity CX1, common mode inductance L1, electric capacity CX2；Wherein：The first input end of the common mode inductance L1 is by fuse F1 with handing over
The live wire electrical connection of stream source, the second input of the common mode inductance L1 electrically connect with alternating current source zero line, the common mode inductance L1's
Piezo-resistance RV1, the electric capacity CX1 are parallel between first input end and second input, by electric capacity CY1 and electric capacity
Branch road in series CY2 and by branch road bleeder resistance R1 and R2 in series, the company of the electric capacity CY1 and electric capacity CY2
Common end grounding is connect, the electric capacity CX2 is connected between the first output end and the second output end of the common mode inductance L1；It is described common
Mould inductance L1 output end electrically connects with the input of the bridge rectifier, the positive terminal of the storage capacitor C1 and institute
State the electrical connection of bridge rectifier output cathode end, one end of the thermistor RT and the bridge rectifier output negative pole
End electrical connection, the other end ground connection of the thermistor RT, the negative pole end ground connection of the storage capacitor C1, the storage capacitor C1
Positive terminal electrically connected with the control circuit.
Further, the power supply circuit includes：Diode D2, resistance R5, polar capacitor C3；The sun of the diode D2
First end extremely with the assists winding of the flyback transformer electrically connects, the cathode terminal of the diode D2 and the one of resistance R5
End electrical connection, the other end of the resistance R5 electrically connect with polar capacitor C3 positive terminal, the negative pole end of the polar capacitor C3
The supply input of the common port and the control chip of ground connection, the resistance R5 and the polar capacitor C3 positive terminal electrical connection
Pin electrically connects.
Further, the output voltage rectification circuit includes：Commutation diode D4, resistance R20, electric capacity C8, polarity electricity
Hold C9, polar capacitor C10, inductance L3, electric capacity C12, electric capacity C17；The secondary windings of the flyback transformation of the flyback on-off circuit
First end the anode tap with the commutation diode D4, one end of the resistance R20 electrically connect respectively, the resistance R20's
The other end is electrically connected by the electric capacity C8 with the cathode terminal of the commutation diode D4, the positive terminal of the polar capacitor C9
Electrically connected with the cathode terminal of the commutation diode D4, the negative pole end ground connection of the polar capacitor C9；One end of the inductance L3
Electrically connected with the cathode terminal of the commutation diode D4, the other end of the inductance L3 with respectively with the polar capacitor C10's
One end, one end electrical connection of one end of the electric capacity C12, the electric capacity C17, the other end, the electricity of the polar capacitor C10
Hold the C12 other end, the other end ground connection of the electric capacity C17；
Further, the feedback sample circuit includes parallel voltage-stabilizing integrated circuit U1, optocoupler OP1, resistance R21, resistance
R22, resistance R23, resistance R24, resistance R25, resistance R26, electric capacity C13, electric capacity C14, electric capacity C16；Wherein：The resistance R21
One end electrically connected with the input of the inductance L3, the anode tap of the other end of the resistance R21 and the optocoupler OP1 is electrically connected
Connect, the OP1 of optocoupler cathode terminal electrically connects with the cathode terminal of the parallel voltage-stabilizing integrated circuit U1, the optocoupler OP1
Output end electrically connected with the feed back input pin of the control chip, the anode tap of parallel voltage-stabilizing integrated circuit U1 ground connection,
The resistance R22 is connected between the anode tap and cathode terminal of the optocoupler OP1；The output end of the inductance L3 passes through electric successively
It is grounded after resistance R24, R25, R26 of connection；The electric capacity C16 is in parallel with the resistance R24；The resistance R25, the resistance
R26 electrical connection common port (node that i.e. resistance R25 connects with resistance R26), respectively with the parallel voltage-stabilizing integrated circuit U1
Reference edge, one end of the electric capacity C13, the electric capacity C14 one end electrical connection, the other end of the electric capacity C13 with it is described
Resistance R23 one end electrical connection, the cathode terminal of the optocoupler OP1A are connected with the cathode terminal of the parallel voltage-stabilizing integrated circuit U1
Common port the other end with the electric capacity C14, the other end of the resistance R23 electrically connect respectively.
Reverse exciting switching voltage regulator provided by the utility model, current sample precision is high, under error range, changes in input voltage
In the case that scope is very big, the leg signal of current sample input pin input can keep minor variations, realize flow point
Uniformity.In addition, the reverse exciting switching voltage regulator of the present invention, the stability of a system height, output voltage stabilization, stand-by power consumption be low, startup when
Between it is short, circuit is simple, cost is low.
Brief description of the drawings
Fig. 1 is that the circuit of the utility model reverse exciting switching voltage regulator embodiment one connects block diagram；
Fig. 2 is another embodiment circuit diagram of the utility model reverse exciting switching voltage regulator；
Fig. 3 is a variety of connection circuit kinds of leakage inductance energy absorbing circuit in another embodiment of the utility model reverse exciting switching voltage regulator
Class figure；
Fig. 4 is a variety of connection circuit diagrams of drive circuit in another embodiment of the utility model reverse exciting switching voltage regulator；
Fig. 5 is another embodiment circuit diagram of the utility model reverse exciting switching voltage regulator.
Reference：
10- input filter rectification circuits；20- flyback on-off circuits；30- output voltage rectification circuits；40- feedback samples electricity
Road；50- control circuits；60- power supply circuits；70- current samples and compensation circuit；80- leakage inductance energy absorbing circuits；90- drives
Circuit；100- protection circuits.
Embodiment
A kind of reverse exciting switching voltage regulator of the utility model, embodiment as shown in figure 1, including：It is input filter rectification circuit 10, anti-
Energizing switch circuit 20, output voltage rectification circuit 30, feedback sample circuit 40, control circuit 50, power supply circuit 60, current sample
And compensation circuit 70；Wherein, flyback on-off circuit 20 respectively with input filter rectification circuit 10, output voltage rectification circuit 30,
Control circuit 50, power supply circuit 60, current sample and compensation circuit 70 electrically connect, input filter rectification circuit 10 also with control
Circuit 50, current sample and compensation circuit 70 electrically connect, and output voltage rectification circuit 30 is also electrically connected with feedback sample circuit 40
Connect, control circuit 50 also electrically connects with feedback sample circuit 40, current sample and compensation circuit 70, power supply circuit 60 respectively；
The alternating current of input is filtered after rectification by input filter rectification circuit 10 to be exported to flyback on-off circuit 20, instead
Transformer storage and energy of releasing are adjusted under the control of control circuit 50 for energizing switch circuit 20, voltage needed for output,
The required voltage that output voltage rectification circuit 30 exports to flyback on-off circuit 20 is supplied to load after carrying out rectifying and wave-filtering processing
Electric energy；Feedback sample circuit 40 gathers the voltage feedback information of the output of output voltage rectification circuit 30, and by voltage feedback information
Export to control circuit 50；Current sample and compensation circuit 70 gather the electric current of the transformer of flyback on-off circuit 20
The high pressure compensation information that information, input filter rectification circuit 10 export, and by the current information collected and high pressure compensation information
Export to control circuit 50；Power supply circuit 60 provides operating voltage to control circuit 50, and the control circuit 50 takes according to feedback
Voltage feedback information, the sample rate current information of current sample and compensation circuit collection and the high pressure compensation letter that sample circuit 40 gathers
Breath, adjustment output pulse duty factor, the break-make of the switching tube of control flyback on-off circuit 20 so that flyback on-off circuit 20 exports
Burning voltage.
Specifically, in reverse exciting switching voltage regulator circuit diagram as shown in Figure 2：
Control circuit 50 includes control chip 1IC2, and control chip 1IC2 zero current detection protects pin (pin of ZCD the 1st),
Electrically connected by resistance R9 with the assists winding of the flyback transformer T1 in flyback on-off circuit 20, zero current detection protection pin
(pin of ZCD the 1st) after electric capacity C5 by being grounded；Control chip 1IC2 feed back input pin (pin of FB the 2nd), with feedback sample circuit 40
Output end electrical connection；Control chip 1IC2 current sample input pin (pin of IS the 3rd), with current sample and compensation circuit 70
Output end electrical connection；Control chip 1IC2 high input voltage pin (pin of VH the 8th), by the divider resistance R17 that is sequentially connected,
Output end after R16, R15 with input filter rectification circuit 10 electrically connects；Control chip 1IC2 supply input pin (VCC the 6th
Pin), electrically connected with the output end of power supply circuit 60, supply input pin after electric capacity C7 by being grounded；Control chip 1IC2 driving
Pin (pin of OUT the 5th), is electrically connected with the gate terminal of the switching tube 1M2 in flyback on-off circuit 20.Control chip 1IC2, we
The control chip 1IC2 of FA5640 series can be selected.
When reverse exciting switching voltage regulator of the present utility model is started working, the AC power of input can first pass through input filter rectification
Circuit 10 exports busbar voltage after being filtered rectification processing, on the one hand busbar voltage passes through the control chip of control circuit 50
1IC2 high input voltage pin (pin of VH the 8th) for control chip 1IC2 provide start voltage (the startup voltage most started is to pass through
Inlet highway voltage is come what is obtained, and after start-up operation, control chip 1IC2 operating voltage is carried by power supply circuit 60
Supply, the flyback transformer T1 of one end connection flyback on-off circuit 20 of power supply circuit 60 assists winding, other end connection control
The control chip 1IC2 of circuit 50 processed supply input pin VCC), bootrom is started working；On the other hand, the busbar voltage is defeated
Enter to flyback on-off circuit 20, during the switching tube conducting of the transformer connection in flyback on-off circuit 20, flyback transformer T1 enters
Row energy storage, when switching tube disconnects, transformer releases energy, transformer secondary output output induced-current.Current sample and compensation electricity
Road 70 can gather the current information of primary winding (primary coil), certainly, to ensure the stabilization of the electric current of final output,
Can band load capacity not by input voltage change influenceed, it is also necessary to gather input filter rectification circuit 10 output bus
The high pressure compensation information of voltage, the current information and high pressure compensation information of collection are input to control chip 1IC2 current sample
Input pin (pin of IS the 3rd)；The direct current that flyback transformer T1 is obtained after releasing energy passes through output voltage rectification circuit 30 again
Filter rectification and energy storage processing, there is provided electric energy is to load.And feedback sample circuit 40 then gathers the electricity of output voltage rectification module
Pressure information is input to control chip 1IC2 feed back input pin (pin of FB the 2nd)；Feed back input pin (pin of FB the 2nd) and current sample are defeated
Enter the internal arithmetic that signal that both pin (pin of IS the 3rd) receive passes through control chip 1IC2 (pwm chip 1IC2), production
Raw PWM outputs.So as to the break-make of the switching tube on the flyback transformer T1 of controlling switch power supply, ensure the voltage stabilization exported,
So that whole system maintains balance.
Flyback on-off circuit 20 includes：Flyback transformer T1, switching tube 1M2；Switching tube 1M2 drain electrode end (the 1st end) with
The first end electrical connection of flyback transformer T1 armature winding, switching tube 1M2 source terminal (the 3rd end) pass through current sample electricity
It is grounded after resistance RS1, switching tube 1M2 gate terminal (the 2nd end) and the control chip 1IC2 of control circuit 50 driving pin (OUT the
5 pin) electrical connection；Electrically connected between switching tube 1M2 source class end (the 3rd end) and gate terminal (the 2nd end) by resistance R8；Flyback becomes
The first end of depressor T1 assists winding electrically connects with power supply circuit 60；The first end of flyback transformer T1 assists winding passes through
Electrically connected after resistance R9 with control chip 1IC2 zero current detection protection pin (pin of ZCD the 1st)；Flyback transformer T1 secondary
The first end of winding electrically connects with the input of output voltage rectification circuit 30, and the of the secondary windings of the flyback transformer
Two ends are grounded.
Current sample and compensation circuit 70 include：Resistance R10, divider resistance R11, divider resistance R12 and by resistance R13
With the electric capacity C6 low pass filters in parallel formed；Resistance R10 one end and flyback transformer T1 switching tube IM2 source class end
(the 3rd end) electrically connects, the current sample input pin (IS the 3rd of the resistance R10 other end and the control chip 1IC2 of control circuit 50
Pin) electrical connection；The current information of transformer T1 primary coil is gathered by current sampling resistor RS1, so as to feed back to control
The control chip 1IC2 of circuit 50 current sample input pin (pin of IS the 3rd)；The output end of input filter rectification circuit 10 according to
The secondary current sample input pin by divider resistance R11, divider resistance R12 and the control chip 1IC2 of control circuit 50 is electrically connected
Connect, by low pass filter one end that resistance R13 and electric capacity C6 parallel connections are formed and the control chip 1IC2 of control circuit 50 electric current
Sample input pin (pin of IS the 3rd) electrical connection, the other end ground connection of low pass filter.
During flyback transformer T1 switching tube IM2 conductings, voltage is had at current sampling resistor RS1, therefore can gather
Current information herein, the busbar voltage that input filter rectification circuit 10 exports can be to current sample input pin (pin of IS the 3rd)
Compensate；In addition, a low pass filter, the electricity that will can be collected are provided with current sample and compensation circuit 70
Stream information and generatrix voltage compensation information are filtered, and filter out high-frequency signal, by low frequency signal, can be effectively realized defeated
Enter voltage change range it is very big in the case of, the leg signal of current sample can keep small change, realize current sample
High precision int.Here the low pass filter set is the RC wave filters of single order, is made up of resistance R13 and electric capacity C6 parallel connections, is tied
Structure is simple, and experiment effect is obvious, easy to operate, small volume, and cost is low.Make in the inverse-excitation type switch power-supply current sample of frequency conversion
High-frequency signal is filtered out with low pass filter, obtains specific low frequency signal.By being directed at resonant vibration frequency conversion flyback power supply chip
Current sample input pin add specific high pressure compensation and LPF, can effectively realize in change range of input voltage very
In the case of big, the leg signal of current sample can keep small change, realize the high precision int of current sample.
The ground of flyback transformer T1 primary sides (primary side) is primary ground, and the ground of secondary side (primary side) is secondary ground, just
Level ground and secondary ground are distinguished in itself relative to transformer, and the earth is different, and what the shell of power supply connect is exactly big
Ground, but transformer can not connect shell, otherwise can short circuit！Primary between secondary ground plus Y capacitance is (such as in Fig. 2
Electric capacity CY5), the energy of secondary side (primary side) can be released to primary side (primary side), then to pass through primary side (primary
Side) it is released to the earth up, it the energy of secondary side (primary side) is nowhere released, cause secondary side (primary side)
Energy space radiates.
Input filter rectification circuit 10 includes：Electromagnetic interface filter, the bridge rectifier being made up of four diodes, energy storage
Electric capacity C1, thermistor RT；Electromagnetic interface filter, the input of electromagnetic interface filter electrically connect with the output end of AC power, EMI filtering
Device includes：Fuse F1, piezo-resistance RV1, electric capacity CY1, electric capacity CY2, resistance R1, resistance R2, electric capacity CX1, common mode inductance
L1, electric capacity CX2；Wherein：Common mode inductance L1 first input end is electrically connected by fuse F1 with alternating current source live wire, common mode inductance
L1 the second input electrically connects with alternating current source zero line, is parallel between common mode inductance L1 first input end and the second input
Piezo-resistance RV1, electric capacity CX1, by branch road electric capacity CY1 and electric capacity CY2 in series and by bleeder resistance R1 and R2 connect structure
Into branch road, the public termination the earth of electric capacity CY1 and electric capacity CY2 connection；Common mode inductance L1 the first output end and the second output
Electric capacity CX2 is connected between end；Common mode inductance L1 output end electrically connects with the input of bridge rectifier, storage capacitor C1
Positive terminal electrically connected with bridge rectifier output cathode end, thermistor RT one end and bridge rectifier output negative pole
End electrical connection, thermistor RT other end ground connection, storage capacitor C1 negative pole end ground connection, the positive terminal of the storage capacitor C1
Electrically connected with the control circuit.
Above-mentioned electromagnetic interface filter can be used for suppressing DM EMI and common mode disturbances, wherein, piezo-resistance RV1 is used for anti-wave
Electric current is gushed, plays certain protective effect.Storage capacitor C1's primarily serves the effect for suppressing dash current.
Power supply circuit 60 includes：Diode D2, resistance R5, polar capacitor C3；Diode D2 anode tap and flyback transformation
The first end electrical connection of device T1 assists winding, diode D2 cathode terminal electrically connect with resistance R5 one end, and resistance R5's is another
One end electrically connects with polar capacitor C3 positive terminal, and polar capacitor C3 negative pole end ground connection, resistance R5 and polar capacitor C3 are just
The common port extremely electrically connected electrically connects with control chip 1IC2 supply input pin.
Output voltage rectification circuit 30 includes：Commutation diode D4, resistance R20, electric capacity C8, polar capacitor C9, polarity electricity
Hold C10, inductance L3, electric capacity C12, electric capacity C17；The first end difference of the secondary windings of the flyback transformation of flyback on-off circuit 20
Anode tap, resistance R20 one end with commutation diode D4 electrically connect, and the resistance R20 other end passes through electric capacity C8 and rectification two
Pole pipe D4 cathode terminal electrical connection, polar capacitor C9 positive terminal electrically connect with commutation diode D4 cathode terminal, polar capacitor
C9 negative pole end ground connection；Inductance L3 one end electrically connects with commutation diode D4 cathode terminal, and the inductance L3 other end is with dividing
One end, electric capacity C17 one end of one end, electric capacity C12 not with polar capacitor C10 electrically connect, the polar capacitor C10 other end,
The electric capacity C12 other end, electric capacity C17 other end ground connection.
It is worth noting that, the present embodiment provide output voltage rectification circuit 30 simply list it is a kind of specifically to become
Depressor output current is filtered the circuit of rectification and energy storage, and this circuit can also select the whole with filtering of other annexations
Stream and the circuit of energy storage.In addition, the quantity of the electric capacity (including polar capacitor), resistance in this circuit can be carried out according to being actually needed
Increase and decrease, in this circuit to element increase or decrease but circuit that actual effect is still the same is in protection scope of the present invention
Within.
Feedback sample circuit 40 include parallel voltage-stabilizing integrated circuit U1, optocoupler OP1, resistance R21, resistance R22, resistance R23,
Resistance R24, resistance R25, resistance R26, electric capacity C13, electric capacity C14, electric capacity C16；Wherein：Resistance R21 one end is with inductance L3's
Input electrically connects, and the resistance R21 other end electrically connects with optocoupler OP1 anode tap, the OP1 of optocoupler cathode terminal with it is in parallel steady
Integrated circuit U1 cathode terminal electrical connection is pressed, optocoupler OP1 output end electrically connects with control chip 1IC2 feed back input pin,
Parallel voltage-stabilizing integrated circuit U1 anode tap ground connection, resistance R22 are connected between optocoupler OP1 anode tap and cathode terminal；Inductance
For L3 output end by being grounded after resistance R24, R25, R26 for being sequentially connected electrically, electric capacity C16 is in parallel with resistance R24；Resistance R25
The common port (i.e. the two link node) being connected with resistance R26, respectively with parallel voltage-stabilizing integrated circuit U1 reference edge, electric capacity
C13 one end, shown electric capacity C14 one end electrical connection；The electric capacity C13 other end electrically connects with resistance R23 one end, optocoupler
The common port that OP1A cathode terminal is connected with parallel voltage-stabilizing integrated circuit U1 the cathode terminal other end with electric capacity C14, electricity respectively
Hinder R23 other end electrical connection.
In addition, on the basis of above-described embodiment, reverse exciting switching voltage regulator also includes leakage inductance energy absorbing circuit 80, flyback switch
A leakage inductance energy absorbing circuit is connected between the first end of the flyback transformer T1 of circuit 20 armature winding and the second end
80。
Leakage inductance energy absorbing circuit 80 is used for the leakage inductance energy for absorbing transformer, leakage inductance energy absorbing circuit 80
There can be a variety of connection methods, as shown in Figure 3.Specifically, the leakage inductance energy absorbing circuit in reverse exciting switching voltage regulator shown in Fig. 5
80 include diode D1, electric capacity C2, resistance R4；Diode D1 anode tap is of the same name with flyback transformer T1 armature winding
End electrical connection, diode D1 cathode terminal pass through the with the armature winding of flyback voltage device after resistance R4, electric capacity C2 in parallel
Two ends electrically connect.
Preferably, reverse exciting switching voltage regulator also includes drive circuit 90, drive circuit 90 and the control chip of control circuit 50
1IC2 driving pin (pin of OUT the 5th) electrical connection, the output end of drive circuit 90 is with the switching tube 1M2's of flyback on-off circuit 20
Gate terminal (the 2nd end) electrically connects.Fig. 4 provides a variety of drive circuits.Specifically, adopted in the reverse exciting switching voltage regulator shown in Fig. 5
Drive circuit 90 includes：Diode D3, resistance R6, resistance R7；The switching tube 1M2 of flyback on-off circuit 20 gate terminal point
One end, resistance R7 one end not with resistance R6 electrically connect, the resistance R6 other end and the control chip 1IC2 of control circuit 50
The electrical connection of driving pin, the resistance R7 other end electrically connects with diode D3 anode tap, diode D3 cathode terminal and control
The control chip 1IC2 of circuit 50 driving pin electrical connection.
Preferably, reverse exciting switching voltage regulator as shown in Figure 5 also includes protection circuit 100, protection circuit 100 includes pressure-sensitive
Resistance RV1, RV2, RV3 and discharge tube FDG1；Piezo-resistance RV1 is electrically connected side by side with common mode inductance L1 input, pressure-sensitive electricity
RV2, a piezo-resistance RV3 branch roads in series are hindered, branch road electrically connects side by side with common mode inductance L1 input, piezo-resistance
RV2 and RV3 public connecting end electrically connects with discharge tube FDG1 input, discharge tube FDG1 output termination the earth.
Claims (10)
- A kind of 1. reverse exciting switching voltage regulator, it is characterised in that including：Input filter rectification circuit, flyback on-off circuit, output voltage Rectification circuit, feedback sample circuit, control circuit, power supply circuit, current sample and compensation circuit；The flyback on-off circuit point Not with the input filter rectification circuit, the output voltage rectification circuit, the control circuit, the power supply circuit, described Current sample and compensation circuit electrical connection, the input filter rectification circuit also with the control circuit, the current sample and Compensation circuit electrically connects, and the output voltage rectification circuit also electrically connects with the feedback sample circuit, and the control circuit is also Electrically connected respectively with the feedback sample circuit, the current sample and compensation circuit, the power supply circuit；The alternating current of alternating current source output passes through the input filter rectification circuit, the flyback on-off circuit, the output voltage Required DC voltage is obtained after rectification circuit, the power supply circuit provides operating voltage, the control to the control circuit The electric current letter of feedback voltage information, the current sample and compensation circuit collection that circuit gathers according to the feedback sample circuit Breath adjustment pulse duty factor, controls the break-make of the switching tube of the flyback on-off circuit so that the flyback on-off circuit it is anti- Violent change depressor exports burning voltage.
- 2. a kind of reverse exciting switching voltage regulator according to claim 1, it is characterised in that the control circuit includes control core Piece, the control chip include：The zero current detection protection pin of the control chip, passes through the flyback transformer in resistance R9 and the flyback on-off circuit Assists winding electrical connection, the zero current detection protects pin by being grounded after electric capacity C5；The feed back input pin of the control chip, pass through the Voltage loop phase separation of optocoupler and output voltage；The current sample input pin of the control chip, is electrically connected with the output end of the current sample and compensation circuit；The high input voltage pin of the control chip, pass through the output end of some resistance and the input filter rectification circuit of series connection Electrical connection；The supply input pin of the control chip, is electrically connected with the output end of the power supply circuit, and the supply input pin passes through It is grounded after electric capacity C7；The driving pin of the control chip, electrically connected with the gate terminal of the switching tube in the flyback on-off circuit.
- A kind of 3. reverse exciting switching voltage regulator according to claim 2, it is characterised in thatThe flyback on-off circuit includes：Flyback transformer, switching tube；The drain electrode end of the switching tube electrically connects with the first end of the armature winding of the flyback transformer, the source of the switching tube Extremely by being grounded after current sampling resistor RS1, the gate terminal of the switching tube and the drive of the control chip of the control circuit Dynamic pin electrical connection；Electrically connected between the source class end of the switching tube and gate terminal by resistance R8；The first end of the assists winding of the flyback transformer electrically connects with the chip power supply circuit；The flyback transformer The first end of assists winding protects pin to electrically connect by the zero current detection after the resistance R9 with the control chip；The first end of the secondary windings of the flyback transformer electrically connects with the input of the output voltage rectification circuit, described The second end ground connection of the secondary windings of flyback transformer.
- 4. a kind of reverse exciting switching voltage regulator according to claim 3, it is characterised in that the current sample and compensation circuit bag Include：Resistance R10, divider resistance R11, divider resistance R12 and the low pass filter being made up of resistance R13 and electric capacity C6 parallel connections；One end of the resistance R10 electrically connects with the source class end of the switching tube of the flyback transformer, and the resistance R10's is another End electrically connects with the current sample input pin of the control chip of the control circuit；The output end of the input filter rectification circuit pass sequentially through the divider resistance R11, the divider resistance R12 with it is described The current sample input pin electrical connection of the control chip of control circuit, one end and the control circuit of the LPF electrical equipment Control chip current sample input pin electrical connection, the low pass filter the other end ground connection.
- 5. a kind of reverse exciting switching voltage regulator according to claim 3, it is characterised in that the reverse exciting switching voltage regulator also includes leakage Inductance energy absorbing circuit, the leakage inductance energy absorbing circuit be arranged on the flyback transformer of the flyback on-off circuit it is primary around Between the first end of group and the second end.
- 6. a kind of reverse exciting switching voltage regulator according to claim 3, it is characterised in that the reverse exciting switching voltage regulator also includes driving Dynamic circuit, the input of the drive circuit electrically connect with the driving pin of the control chip of the control circuit, the driving electricity The output end on road electrically connects with the gate terminal of the switching tube of the flyback on-off circuit.
- A kind of 7. reverse exciting switching voltage regulator according to claim 2, it is characterised in that the input filter rectification circuit bag Include：Electromagnetic interface filter, the bridge rectifier being made up of four diodes, storage capacitor C1, thermistor RT；Electromagnetic interface filter, the input of the electromagnetic interface filter electrically connect with the output end of AC power, the electromagnetic interface filter bag Include：Fuse F1, piezo-resistance RV1, electric capacity CY1, electric capacity CY2, resistance R1, resistance R2, electric capacity CX1, common mode inductance L1, electric capacity CX2；Wherein：The first input end of the common mode inductance L1 is electrically connected by fuse F1 with alternating current source live wire, the common mode electricity Sense L1 the second input electrically connects with alternating current source zero line, between the first input end and the second input of the common mode inductance L1 It is parallel with piezo-resistance RV1, the electric capacity CX1, by branch road electric capacity CY1 and electric capacity CY2 in series and by bleeder resistance R1 The branch road in series with R2, the public termination the earth of connection of the electric capacity CY1 and electric capacity CY2；The of the common mode inductance L1 The electric capacity CX2 is connected between one output end and the second output end；The output end of the common mode inductance L1 electrically connects with the input of the bridge rectifier, and the storage capacitor C1 is just Extremely electrically connected with the bridge rectifier output cathode end, one end and the bridge rectifier of the thermistor RT Output negative pole end electrically connects, the other end ground connection of the thermistor RT, the negative pole end ground connection of the storage capacitor C1, the storage Energy electric capacity C1 positive terminal electrically connects with the control circuit.
- 8. a kind of reverse exciting switching voltage regulator according to claim 3, it is characterised in that the power supply circuit includes：Diode D2, resistance R5, polar capacitor C3；The anode tap of the diode D2 and the first end electricity of the assists winding of the flyback transformer Connection, the cathode terminal of the diode D2 electrically connect with resistance R5 one end, the other end and the polar capacitor C3 of the resistance R5 Positive terminal electrical connection, the negative pole end ground connection of the polar capacitor C3, the resistance R5 and the polar capacitor C3 positive terminal The common port of electrical connection electrically connects with the supply input pin of the control chip.
- 9. according to a kind of reverse exciting switching voltage regulator described in claim any one of 3-8, it is characterised in that the output voltage rectification Circuit includes：Commutation diode D4, resistance R20, electric capacity C8, polar capacitor C9, polar capacitor C10, inductance L3, electric capacity C12, electricity Hold C17；The first end of the secondary windings of flyback transformation in the flyback on-off circuit sun with the commutation diode D4 respectively Extremely, one end electrical connection of the resistance R20, the other end of the resistance R20 pass through the electric capacity C8 and the pole of rectification two Pipe D4 cathode terminal electrical connection, the positive terminal of the polar capacitor C9 electrically connect with the cathode terminal of the commutation diode D4, institute State polar capacitor C9 negative pole end ground connection；One end of the inductance L3 electrically connects with the cathode terminal of the commutation diode D4, the other end and difference of the inductance L3 One end, one end of the electric capacity C17 of one end, the electric capacity C12 with the polar capacitor C10 electrically connect, the polarity electricity Hold the C10 other end, the other end of the electric capacity C12, the electric capacity C17 other end ground connection.
- 10. a kind of reverse exciting switching voltage regulator according to claim 9, it is characterised in that the feedback sample circuit is included simultaneously Join integrated regulator U1, optocoupler OP1, resistance R21, resistance R22, resistance R23, resistance R24, resistance R25, resistance R26, electric capacity C13, electric capacity C14, electric capacity C16；Wherein：One end of the resistance R21 electrically connects with the input of the inductance L3, the other end and the optocoupler of the resistance R21 OP1 anode tap electrical connection, the cathode terminal of the OP1 of optocoupler cathode terminal and the parallel voltage-stabilizing integrated circuit U1 are electrically connected Connect, the output end of the optocoupler OP1 electrically connects with the feed back input pin of the control chip, the parallel voltage-stabilizing integrated circuit U1 Anode tap ground connection, the resistance R22 is connected between the anode tap and cathode terminal of the optocoupler OP1；The inductance L3's is defeated Go out after end passes through resistance R24, R25, the R26 being sequentially connected electrically and be grounded, the electric capacity C16 is in parallel with the resistance R24；The electricity Hinder R25, the resistance R26 electrical connection common port, respectively with reference edge, the electric capacity of the parallel voltage-stabilizing integrated circuit U1 C13 one end, one end electrical connection of the electric capacity C14；One end of the other end of the electric capacity C13 and the resistance R23 is electrically connected Connect, the common port that the cathode terminal of the optocoupler OP1A is connected with the cathode terminal of the parallel voltage-stabilizing integrated circuit U1 respectively with it is described The other end electrical connection of the electric capacity C14 other end, the resistance R23.
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| CN201720331741.7U CN206894526U (en) | 2017-03-31 | 2017-03-31 | A kind of reverse exciting switching voltage regulator |
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| CN201720331741.7U CN206894526U (en) | 2017-03-31 | 2017-03-31 | A kind of reverse exciting switching voltage regulator |
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| CN109039042A (en) * | 2018-08-03 | 2018-12-18 | 广州金升阳科技有限公司 | The compensation circuit of overcurrent protection |
| CN109245574A (en) * | 2018-09-07 | 2019-01-18 | 广州市保伦电子有限公司 | A kind of Switching Power Supply and sound system based on IR2156 |
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| CN112217396A (en) * | 2020-09-30 | 2021-01-12 | 湖北理工学院 | Single-ended flyback power supply |
| CN112910261A (en) * | 2021-01-20 | 2021-06-04 | 深圳市康弘环保技术有限公司 | Flyback type isolating switch power supply for alternating current motor drive compensation |
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| CN109039042B (en) * | 2018-08-03 | 2023-11-17 | 广州金升阳科技有限公司 | Compensation circuit for overcurrent protection |
| CN109039042A (en) * | 2018-08-03 | 2018-12-18 | 广州金升阳科技有限公司 | The compensation circuit of overcurrent protection |
| CN109245574A (en) * | 2018-09-07 | 2019-01-18 | 广州市保伦电子有限公司 | A kind of Switching Power Supply and sound system based on IR2156 |
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| CN112217396A (en) * | 2020-09-30 | 2021-01-12 | 湖北理工学院 | Single-ended flyback power supply |
| CN112910261A (en) * | 2021-01-20 | 2021-06-04 | 深圳市康弘环保技术有限公司 | Flyback type isolating switch power supply for alternating current motor drive compensation |
| CN113110125A (en) * | 2021-03-15 | 2021-07-13 | 三门康创电子科技有限公司 | Fruit and vegetable machine control circuit, fruit and vegetable machine and fruit and vegetable machine control method |
| CN113110125B (en) * | 2021-03-15 | 2022-04-01 | 三门康创电子科技有限公司 | Fruit and vegetable machine control circuit, fruit and vegetable machine and fruit and vegetable machine control method |
| CN113765348A (en) * | 2021-10-19 | 2021-12-07 | 上海联影医疗科技股份有限公司 | High-voltage power supply and medical imaging equipment |
| CN113765348B (en) * | 2021-10-19 | 2024-02-02 | 上海联影医疗科技股份有限公司 | High-voltage power supply and medical imaging equipment |
| CN114499214A (en) * | 2022-04-15 | 2022-05-13 | 深圳市洛仑兹技术有限公司 | Signal transmission device and switching power supply equipment |
| CN115333216A (en) * | 2022-08-29 | 2022-11-11 | 新风光电子科技股份有限公司 | Flyback power large-capacity capacitor quick charging control circuit |
| CN116359603A (en) * | 2023-03-29 | 2023-06-30 | 江苏斯菲尔电气股份有限公司 | Three-phase electric energy meter circuit |
| CN116359603B (en) * | 2023-03-29 | 2023-10-24 | 江苏斯菲尔电气股份有限公司 | Three-phase electric energy meter circuit |
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