CN205911962U - High efficiency switching power supply - Google Patents
High efficiency switching power supply Download PDFInfo
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- CN205911962U CN205911962U CN201620848412.5U CN201620848412U CN205911962U CN 205911962 U CN205911962 U CN 205911962U CN 201620848412 U CN201620848412 U CN 201620848412U CN 205911962 U CN205911962 U CN 205911962U
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Abstract
The utility model provides a high efficiency switching power supply, it is including anti thunderbolt circuit, first rectification filter circuit, flyback converter, vary voltage circuit, second rectification filter circuit and output, anti thunderbolt circuit is connected with external power source, first rectification filter circuit and anti thunderbolt circuit connection, and flyback converter and first rectification filter circuit are connected, the vary voltage circuit and the sharp circuit connection that turns over, second rectification filter circuit is connected with vary voltage circuit and output respectively to output and external circuit connection, wherein, the inside power control chip that is provided with of flyback converter, the inside synchronous Rectifier chip that is provided with of second rectification filter circuit, the utility model discloses a substitute original schottky diode at the inside synchronous Rectifier chip that sets up of second rectification filter circuit to reduce second rectification filter circuit's consumption, improved switching power supply's overall efficiency.
Description
Technical field
This utility model is related to field of switch power, particularly to a kind of circuit of synchronous rectification of Switching Power Supply.
Background technology
With the progress of social development and science and technology, the particularly development of switch power technology, Switching Power Supply has become
One of people's requisite electric attachments upper with work in life.
But, as shown in figure 1, existing Switching Power Supply includes anti thunder strike circuit 12, the first current rectifying and wave filtering circuit 13, flyback
Circuit 14, transforming circuit 15, the second current rectifying and wave filtering circuit 16 and outfan 17, the wherein second current rectifying and wave filtering circuit 16 is by making
Synchronize rectification with the voltage that Schottky diode d31 and d34 comes to transforming circuit coupling, more flat through electrochemical capacitor
Sliding filtering, obtains DC voltage.But, the loss of Schottky diode d31 and d34 is excessive, can waste a part of electric energy, thus
Reduce the overall efficiency of Switching Power Supply.
Therefore need to provide a kind of high efficiency switch power supply, to solve above-mentioned technical problem.
Utility model content
This utility model provides a kind of high efficiency switch power supply, low to solve Switching Power Supply overall efficiency of the prior art
Problem.
For solving above-mentioned technical problem, the technical solution of the utility model is: a kind of high efficiency switch power supply, comprising:
Anti thunder strike circuit, is connected with described external power source, for protecting described Switching Power Supply and outer circuits；
First current rectifying and wave filtering circuit, is connected with described anti thunder strike circuit, and the voltage for inputting to described external power source enters
Row rectifying and wave-filtering；
Circuit of reversed excitation, is connected with described first current rectifying and wave filtering circuit；
Transforming circuit, is connected with described circuit of reversed excitation, for carrying out the voltage of described first current rectifying and wave filtering circuit output
Convert and export first voltage；
Second current rectifying and wave filtering circuit, is connected with described transforming circuit, for the first voltage exporting described transforming circuit
Carry out rectifying and wave-filtering and export second voltage, described second current rectifying and wave filtering circuit include synchronous rectification chip, the 8th electrochemical capacitor,
13rd resistance, the 14th resistance, the 15th resistance and the 16th resistance, described 13rd resistance, described 14th resistance and
The resistance of described 15th resistance is the same；
Wherein, model csc7702 of described synchronous rectification chip, described 13rd resistance with two ends respectively with described
The connection of sense pin, one end of described 14th resistance and the described synchronous rectification of transforming circuit and described synchronous rectification chip
The set pin of chip connects, the other end ground connection of described 14th resistance, the two ends of described 15th resistance respectively with described change
The connection of vcc pin, the gnd pin of described synchronous rectification chip and the described Switching Power Supply of volt circuit and described synchronous rectification chip
The negative pole of outfan connect, the drain pin of described synchronous rectification chip is connected with described transforming circuit, and the described 8th is electrolysed
One end of electric capacity is connected with described 15th resistance, and the other end of described 8th electrochemical capacitor is connected with the negative pole of described outfan
Connect, being connected in parallel with described 8th electrochemical capacitor and described outfan of described 16th resistance, the 16th resistance is defeated with described
Go out one end ground connection that the negative pole at end connects；
Described anti thunder strike circuit includes electric fuse and varistor, the fire of one end of described electric fuse and described external power source
Line connects, and one end of described varistor is connected with the other end of described electric fuse, the other end of described varistor with described
The zero line of external power source connects；
Described first current rectifying and wave filtering circuit includes full bridge rectifier, the first electrochemical capacitor, common mode inductance and the second electrolysis
Electric capacity, described full bridge rectifier is connected with described anti thunder strike circuit and described common mode inductance respectively, described first electrochemical capacitor
It is arranged between described full bridge rectifier and described common mode inductance, and with described full bridge rectifier with described common mode inductance simultaneously
Connection connects, and described second electrochemical capacitor is arranged between described common mode inductance and described circuit of reversed excitation, and with described common mode inductance
It is connected in parallel, the minus earth of described second electrochemical capacitor, described common mode inductance includes first resistor and second resistance, described
The two ends of one resistance are connected with the positive pole of described first electrochemical capacitor and the positive pole of described second electrochemical capacitor respectively, and described second
The two ends of resistance are connected with the negative pole of described first electrochemical capacitor and the negative pole of described second electrochemical capacitor respectively；
Described circuit of reversed excitation is provided with power supply control chip, model sp2618f of described power supply control chip, described electricity
The vdd pin of source control chip is connected with 3rd resistor, the 4th resistant series, and described 3rd resistor is with described first resistor even
Connect, the positive pole of the 4th electrochemical capacitor is connected with the vdd pin of described power supply control chip, the negative pole of described 4th electrochemical capacitor with
Negative pole connection, the nc pin of described power supply control chip and the 6th capacitance connection of described second electrochemical capacitor, described 6th electricity
Hold and be connected with the negative pole of described second electrochemical capacitor, the fb pin of described power supply control chip is connected with the tenth resistance, the 7th electricity
Hold and be connected with described tenth resistor coupled in parallel, described 7th electric capacity and described tenth resistance are all grounded, described power supply control chip
Cs pin is connected with the 11st resistance, and described 11st resistance is connected with the 12nd resistor coupled in parallel, described 11st resistance and institute
State the 12nd resistance to be all grounded, the drain pin of described power supply control chip is connected with 2 interfaces of described transforming circuit, described
The gnd pin ground connection of power supply control chip；
1 interface of described transforming circuit is connected with described common mode inductance, 2 interfaces of described transforming circuit and the first diode
Positive pole connect, the negative pole of described first diode and the 6th resistance and the 5th resistant series, described 5th resistance is electric with common mode
Sense connection, the 3rd electric capacity and described 5th resistor coupled in parallel, 4 interfacing ground of described transforming circuit, 5 interfaces of described transforming circuit
Be connected with the positive pole of the second diode, the negative pole of described second diode is connected with the 7th resistance, described 7th resistance with described
3rd resistor connection, the 8th resistance and the connection of the 9th resistor coupled in parallel, described 8th resistance being connected in parallel and described 9th resistance
Two ends be connected with 5 interfaces of described transforming circuit and the fb pin of described power supply control chip respectively, described 8th resistance and
The resistance of described 9th resistance is the same.
This utility model further relates to a kind of high efficiency switch power supply, comprising:
Anti thunder strike circuit, is connected with described external power source, for protecting described Switching Power Supply and outer circuits；
First current rectifying and wave filtering circuit, is connected with described anti thunder strike circuit, and the voltage for inputting to described external power source enters
Row rectifying and wave-filtering；
Circuit of reversed excitation, is connected with described first current rectifying and wave filtering circuit；
Transforming circuit, is connected with described circuit of reversed excitation, for carrying out the voltage of described first current rectifying and wave filtering circuit output
Convert and export first voltage；
Second current rectifying and wave filtering circuit, is connected with described transforming circuit, for the first voltage exporting described transforming circuit
Carry out rectifying and wave-filtering and export second voltage, described second current rectifying and wave filtering circuit include synchronous rectification chip, the 8th electrochemical capacitor,
13rd resistance, the 14th resistance, the 15th resistance and the 16th resistance, described 13rd resistance, described 14th resistance and
The resistance of described 15th resistance is the same.
In high efficiency switch power supply of the present utility model, model csc7702 of described synchronous rectification chip, described
13 resistance with two ends be connected with the sense pin of described transforming circuit and described synchronous rectification chip respectively, the described tenth
One end of four resistance is connected with the set pin of described synchronous rectification chip, the other end of described 14th resistance ground connection, and described the
The two ends of 15 resistance are connected with the vcc pin of described transforming circuit and described synchronous rectification chip respectively, described synchronous rectification
The gnd pin of chip is connected with the negative pole of the outfan of described Switching Power Supply, the drain pin of described synchronous rectification chip and institute
State transforming circuit to connect, one end of described 8th electrochemical capacitor is connected with described 15th resistance, described 8th electrochemical capacitor
The other end is connected with the negative pole of described outfan, described 16th resistance with described 8th electrochemical capacitor and described outfan simultaneously
Connection connects, one end ground connection that the 16th resistance is connected with the negative pole of described outfan.
In high efficiency switch power supply of the present utility model, described anti thunder strike circuit includes electric fuse and varistor, institute
The one end stating electric fuse is connected with the live wire of described external power source, the other end of one end of described varistor and described electric fuse
Connect, the other end of described varistor is connected with the zero line of described external power source.
In high efficiency switch power supply of the present utility model, described electric fuse is high pressure resistant electric fuse.
In high efficiency switch power supply of the present utility model, described first current rectifying and wave filtering circuit include full bridge rectifier,
First electrochemical capacitor, common mode inductance and the second electrochemical capacitor, described full bridge rectifier respectively with described anti thunder strike circuit and institute
State common mode inductance to connect, described first electrochemical capacitor is arranged between described full bridge rectifier and described common mode inductance, and with
Described full bridge rectifier is connected in parallel with described common mode inductance, and described second electrochemical capacitor is arranged on described common mode inductance and institute
State between circuit of reversed excitation, and be connected in parallel with described common mode inductance, the minus earth of described second electrochemical capacitor, described common mode electricity
Sense includes first resistor and second resistance, the two ends of described first resistor respectively with the positive pole of described first electrochemical capacitor and described
The positive pole of the second electrochemical capacitor connects, the two ends of described second resistance respectively with the negative pole of described first electrochemical capacitor and described the
The negative pole of two electrochemical capacitors connects.
In high efficiency switch power supply of the present utility model, described circuit of reversed excitation is provided with power supply control chip, described electricity
Model sp2618f of source control chip, the vdd pin of described power supply control chip is with 3rd resistor, the 4th resistant series even
Connect, described 3rd resistor is connected with described first resistor, the vdd pipe of the positive pole of the 4th electrochemical capacitor and described power supply control chip
Foot connects, and the negative pole of described 4th electrochemical capacitor is connected with the negative pole of described second electrochemical capacitor, described power supply control chip
Nc pin and the 6th capacitance connection, described 6th electric capacity is connected with the negative pole of described second electrochemical capacitor, described power supply core
The fb pin of piece is connected with the tenth resistance, and the 7th electric capacity is connected with described tenth resistor coupled in parallel, described 7th electric capacity and described the
Ten resistance are all grounded, and the cs pin of described power supply control chip is connected with the 11st resistance, described 11st resistance and the 12nd
Resistor coupled in parallel connects, and described 11st resistance and described 12nd resistance are all grounded, the drain pin of described power supply control chip
It is connected with described transforming circuit, the gnd pin ground connection of described power supply control chip.
In high efficiency switch power supply of the present utility model, described transforming circuit is connected with described common mode inductance, described change
Volt circuit is connected with the positive pole of the first diode, the negative pole of described first diode and the 6th resistance and the 5th resistant series, institute
State the 5th resistance and common mode inductance connection, the 3rd electric capacity and described 5th resistor coupled in parallel, described transforming circuit ground connection, described transformation
Circuit is connected with the positive pole of the second diode, and the negative pole of described second diode is connected with the 7th resistance, described 7th resistance with
Described 3rd resistor connects, and the 8th resistance and the 9th resistor coupled in parallel connect, described 8th resistance being connected in parallel and the described 9th
The two ends of resistance are connected with the fb pin of described transforming circuit and described power supply control chip respectively, described 8th resistance and described
The resistance of the 9th resistance is the same.
This utility model compared to prior art, its advantage is: by arranging inside the second current rectifying and wave filtering circuit
Synchronous rectification chip substituting original Schottky diode, thus reducing the power consumption of the second current rectifying and wave filtering circuit, thus improving
The overall efficiency of Switching Power Supply.
Brief description
Fig. 1 is the circuit diagram of the Switching Power Supply of prior art.
Fig. 2 is the circuit diagram of the embodiment of high efficiency switch power supply of the present utility model.
Fig. 3 is the structural representation of the preferred embodiment of high efficiency switch power supply of the present utility model.
Fig. 4 is the functional-block diagram of this utility model csc7702.
Specific embodiment
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is carried out
Clearly and completely description is it is clear that described embodiment is only a part of embodiment of this utility model rather than whole
Embodiment.Based on the embodiment in this utility model, those skilled in the art are obtained under the premise of not making creative work
The every other embodiment obtaining, broadly falls into the scope of this utility model protection.
In in figure, the similar unit of structure is to be represented with identical label.
Refer to Fig. 2 and Fig. 4, Fig. 2 is the circuit diagram of the embodiment of high efficiency switch power supply of the present utility model, figure
4 is the functional-block diagram of this utility model csc7702.
A kind of high efficiency switch power supply, including anti thunder strike circuit 22, the first current rectifying and wave filtering circuit 23, circuit of reversed excitation 24, becomes
Volt circuit 25, the second current rectifying and wave filtering circuit 26 and outfan 27, high efficiency switch power supply is used for connecting external power source 21 and external
Circuit.
Wherein, anti thunder strike circuit 22 includes electric fuse f and varistor mov, and electric fuse f is high pressure resistant electric fuse.Insurance
Silk f two ends be connected with the live wire of external power source 21 and varistor mov respectively, varistor mov also with external power source 21
Zero line connects, and external power source 21, electric fuse f and varistor mov constitute anti-lightning loop.
First current rectifying and wave filtering circuit 23 includes full bridge rectifier bd, the first electrochemical capacitor c1, common mode inductance lf and second
Electrochemical capacitor c2.Full bridge rectifier bd is connected with described anti thunder strike circuit and common mode inductance lf respectively, the first electrochemical capacitor c1
It is arranged between full bridge rectifier bd and common mode inductance lf, and be connected in parallel with common mode inductance lf with full bridge rectifier bd,
Second electrochemical capacitor c2 is arranged between common mode inductance lf and described circuit of reversed excitation, and is connected in parallel with common mode inductance lf, second
The minus earth of electrochemical capacitor c2.
Common mode inductance lf includes first resistor r11 and second resistance r12, and the two ends of first resistor r11 are electric with first respectively
The positive pole of the solution positive pole of electric capacity c1 and the second electrochemical capacitor c2 connects, the two ends of second resistance r12 respectively with the first electrochemical capacitor
The negative pole of the negative pole of c1 and the second electrochemical capacitor c2 connects.
Circuit of reversed excitation 34 is provided with power supply control chip 241, model sp2618f of power supply control chip 241, model
8 pins are provided with the power supply control chip 241 of sp2618f, respectively vdd pin, nc pin, fb pin, cs pin,
Drain pin and gnd pin, wherein drain pin and gnd pin are provided with two.
1 interface, 2 interfaces, 4 interfaces, 5 interfaces, 6 interfaces and 7 interfaces are provided with altogether on transforming circuit 25, six altogether
Interface, wherein 1 interface and 2 interfaces are one group, and 4 interfaces and 5 interfaces are one group, and 6 interfaces and 7 interfaces are one group.
The vdd pin of power supply control chip 241 is connected in series with 3rd resistor r21, the 4th r22,3rd resistor r21 and
One resistance r11 connects, and the positive pole of the 4th electrochemical capacitor c4 is connected with the vdd pin of power supply control chip 241, the 4th electrochemical capacitor
The negative pole of c4 is connected with the negative pole of the second electrochemical capacitor c2, and the nc pin of power supply control chip 241 is connected with the 6th electric capacity c6, the
Six electric capacity c6 are connected with the negative pole of the second electrochemical capacitor c2, and the fb pin of power supply control chip 241 is connected with the tenth resistance r7, the
Seven electric capacity c7 and the tenth resistance r7 is connected in parallel, and the 7th electric capacity c7 and the tenth resistance r7 is all grounded, the cs of power supply control chip 241
Pin is connected with the 11st resistance r81, and the 11st resistance r81 and the 12nd resistance r82 is connected in parallel, the 11st resistance r81 with
12nd resistance r82 is all grounded, and the drain pin of power supply control chip 241 is connected with 2 interfaces, power supply control chip 241
Gnd pin is grounded.
1 interface is connected with common mode inductance lf, and 2 interfaces are connected with the positive pole of the first diode d1, and the first diode d1's is negative
Connected with the 6th resistance r4 and the 5th resistance r3 in pole, the 5th resistance r3 is connected with common mode inductance lf, the 3rd electric capacity c3 and the 5th electricity
Resistance r3 is in parallel.4 interfacing ground, 5 interfaces are connected with the positive pole of the second diode d2, the negative pole of the second diode d2 and the 7th resistance
R5 connects, and the 7th resistance r5 is connected with 3rd resistor r21, and the 8th resistance r61 and the 9th resistance r62 are connected in parallel, and are connected in parallel
The 8th resistance r61 and the two ends of the 9th resistance r62 be connected with the fb pin of 5 interfaces and power supply control chip 241 respectively.And
And, the resistance of the 8th resistance r61 and the 9th resistance r62 is the same.
Second current rectifying and wave filtering circuit 26 is connected with transforming circuit 25, and the second current rectifying and wave filtering circuit 26 includes synchronous rectification chip
261st, the 8th electrochemical capacitor c8, the 13rd resistance r91, the 14th resistance r92, the 15th resistance r93 and the 16th resistance r10.
Wherein, the 13rd resistance r91, the 14th resistance r92 and the 15th resistance r93 resistance the same.
Model csc7702 of synchronous rectification chip 261,1 pin of synchronous rectification chip 261 is gate pin, 2 pins
For sense pin, 3 pins are set pin, and 4 pins are vcc pin, and 5 pins and 6 pins are gnd pin, 7 pins and 8 pins
For drain pin.
The synchronous rectification chip 261 of model csc7702 be internally provided with the first operational amplifier 2611, the second computing
Amplifier 2612, rs trigger 2613, driving amplifier 2614, mosfet pipe 2615, parasitic diode 2616, the time relay
2617, a reference source 2618 and uvlo2619.
Wherein, the vcc pin of synchronous rectification chip 261 is connected with a reference source 2618 and uvlo2619 respectively, a reference source
2618 are connected with the in-phase input end of the first operational amplifier 2611, the inverting input of the first operational amplifier 2611 respectively with
The in-phase input end of the sense pin of synchronous rectification chip 261 and the second operational amplifier 2612 connects, the second operational amplifier
2612 reverse inter-input-ing ending grounding.
The outfan of the first operational amplifier 2611 is connected with the r end of rs trigger 2613, the second operational amplifier 2612
Outfan be connected with the s end of rs trigger 2613, the q end of rs trigger 2613 is connected with driving amplifier 2614, and driving is put
Big device 2614 is connected with the gate pin of synchronous rectification chip 261.
The grid of mosfet pipe 2615 is connected with driving amplifier 2614, the source class of mosfet pipe 2615 and synchronous rectification core
The gnd pin of piece 261 connects, and the drain of mosfet pipe 2615 is connected with the drain pin of synchronous rectification chip 261, mosfet
The drain of pipe 2615 is connected with the two ends of parasitic diode 2616 with source class.
On the synchronous rectification chip 261 of model csc7702, the function of gate pin is as mosfet pipe 2615
Grid end, drain pin function is the leakage broken ends of fractured bone as mosfet pipe 2615, and gnd pin is the source as mosfet pipe 2615.
The function of sense pin is to input test side as synchronous voltage signal, and set pin is as Voltage Reference end, for adjusting
Non-essential resistance, can arrange minimum deadline, and vcc pin is as voltage end.
And, the gate pin of synchronous rectification chip 261 is not connected with external circuit, the 13rd resistance r91 and two ends
It is connected with the sense pin of 6 interfaces and synchronous rectification chip 261 respectively, one end of the 14th resistance r92 and synchronous rectification chip
261 set pin connects, the other end ground connection of the 14th resistance r92, the two ends of the 15th resistance r93 respectively with 7 interfaces and with
The vcc pin of step rectification chip 261 connects, and the gnd pin of synchronous rectification chip 261 is connected with the negative pole of outfan 27, synchronous
The drain pin of rectification chip 261 is connected with 6 interfaces, and one end of the 8th electrochemical capacitor c8 is connected with the 15th resistance r93, the
The other end of eight electrochemical capacitor c8 is connected with the negative pole of outfan 27, the 16th resistance r10 with the 8th electrochemical capacitor c8 and defeated
Go out end 27 to be connected in parallel, one end ground connection that the 16th resistance r10 is connected with the negative pole of outfan 27.
Outfan 27 is connected with outer circuits, for by incoming for electric current outer circuits, and provides electric energy.
Operation principle of the present utility model:
First, access external power source 21, electric current first flows in anti thunder strike circuit 22.Now, if the voltage of external power source 21
During threshold value less than varistor mov, Switching Power Supply normal work, if the voltage of external power source 21 is higher than varistor mov's
During threshold value；The resistance of varistor mov diminishes rapidly and goes to zero so that electric fuse f is directly gone here and there with the two ends of external power source 21
Connection, so that electric fuse f fusing, to reach the effect of protection switch power supply and outer circuits.
Wherein, electric fuse f uses high pressure resistant electric fuse, can avoid the occurrence of, the voltage of external power source 21 is not higher than pressure-sensitive
During the threshold value of resistance mov, the situation occurring as soon as electric fuse f fusing occurs.
Then, electric current flows into the first current rectifying and wave filtering circuit 23.Wherein, full bridge rectifier bd is first whole by external ac power source
Flow for more smooth unidirectional current；By common mode inductance lf, the electromagnetic interference signal of the common mode in power supply is filtered out again.
Because circuit of reversed excitation 24 is in dcm mode of operation, i.e. interrupter duty mould in the presence of power supply control chip 241
Formula.Power supply control chip 241 carries out cyclically-varying between charged state and discharge condition, and this cycle is referred to as flyback week
Phase.When power supply control chip 241 is in charged state, Switching Power Supply is connected, and circuit of reversed excitation 24 converts electrical energy into magnetic energy；Power supply
When control chip 241 is in discharge condition, Switching Power Supply disconnects, and magnetic energy is converted into electric energy by circuit of reversed excitation 24.
Must be used by this power supply control chip 241, so that all energy being stored in transformator 25, in flyback
It is transferred to outfan 27 in cycle, and the energy loss of Switching Power Supply can be reduced it is also possible to slow down in Switching Power Supply
The loss of portion's device, thus improve the life-span of Switching Power Supply.
Subsequently, the voltage that the first current rectifying and wave filtering circuit 23 exports is converted by transforming circuit 25, and exports the first electricity
Pressure.
Finally, the first voltage that transforming circuit 25 coupling comes is processed by the second current rectifying and wave filtering circuit 26.Same before this
The first voltage that step rectification chip 261 comes to transforming circuit 25 coupling synchronizes rectification, through the 8th electrochemical capacitor c8
Smothing filtering, thus obtaining reliable and stable DC voltage, this DC voltage is second voltage.And, outfan 27 is by second
Voltage is transferred to outer circuits.
Wherein, model csc7702 of synchronous rectification chip 261, the synchronous rectification chip 261 of this model has consumption
Feature low, that unlatching threshold voltage is low, switching speed is fast and reverse recovery time is short.
When electric current flows into from the vcc pin of synchronous rectification chip 261, the voltage at vcc pin is started from scratch rising, this
When circuit under-voltage locking state is entered due to uvlo2619, the output voltage of driving amplifier 2614 is low-voltage, now circuit
It is closed, now internal n-channel mosfet pipe 2615 is under the rectification state of parasitic diode 2616.When vcc pipe
After voltage at foot reaches the reference voltage of a reference source 2618, internal control module starts, and circuit passes through drain pin and checks electricity
Pressure, when voltage is less than setting voltage threshold values, produces a drive signal and drives mosfet after certain time-delay inside circuit
Pipe 2615 turns on, and now electric current is immediately from the mosfet pipe 2615 that conducting transferred to by endophyte diode 2616.
Finish with storage energy slow release on the transformer, also will slowly be subtracted by the electric current of mosfet pipe 2615
Voltage at the little pin to zero, drain also will slowly rise, after at this, voltage is more than setting voltage threshold values, driving amplifier
2614 close after certain time-delay, and mosfet pipe 2615 is again introduced into cut-off state.
So, energy expenditure can be fallen by the synchronous rectification chip 261 of model csc7702 completely, and is lost much
Loss less than Schottky diode.
So complete the work process of the high efficiency switch power supply of this preferred embodiment.
This utility model compared to prior art, its advantage is: by arranging inside the second current rectifying and wave filtering circuit
Synchronous rectification chip substituting original Schottky diode, thus reducing the power consumption of the second current rectifying and wave filtering circuit, thus improving
The overall efficiency of Switching Power Supply.
Refer to Fig. 3, Fig. 3 is the structural representation of the preferred embodiment of high efficiency switch power supply of the present utility model.Should
High efficiency switch power supply 30 is used for connecting external power source 31 and outer circuits 38, and high efficiency switch power supply 30 includes anti thunder strike circuit
32nd, the first current rectifying and wave filtering circuit 33, circuit of reversed excitation 34, transforming circuit 35, the second current rectifying and wave filtering circuit 36 and outfan 37.
Anti thunder strike circuit 32 is connected with the first current rectifying and wave filtering circuit 33, the first current rectifying and wave filtering circuit 33 and circuit of reversed excitation 34
It is connected, circuit of reversed excitation 34 is connected with transforming circuit 35, transforming circuit 35 is connected with the second current rectifying and wave filtering circuit 36, second
Current rectifying and wave filtering circuit 36 is connected with outfan 37, and outfan 37 is used for being connected with outer circuits 38.
Wherein, the second current rectifying and wave filtering circuit 36 is internally provided with synchronous rectification chip, for replacing consuming excessive Xiao Te
Based diode, and, model csc7702 of synchronous rectification chip.
The operation principle of high efficiency switch power supply of this preferred embodiment and the high efficiency switch power supply of above-described embodiment
Operation principle is similar or identical, specifically refer to above-described embodiment.
In sum although this utility model is disclosed above with preferred embodiment, but above preferred embodiment is not used
To limit this utility model, those of ordinary skill in the art, without departing from spirit and scope of the present utility model, all can make
Various changes and retouching, protection domain therefore of the present utility model is defined by the scope that claim defines.
Claims (8)
1. a kind of high efficiency switch power supply is it is characterised in that include:
Anti thunder strike circuit, is connected with described external power source, for protecting described Switching Power Supply and outer circuits；
First current rectifying and wave filtering circuit, is connected with described anti thunder strike circuit, and the voltage for inputting to described external power source carries out whole
Stream filtering；
Circuit of reversed excitation, is connected with described first current rectifying and wave filtering circuit；
Transforming circuit, is connected with described circuit of reversed excitation, for being converted the voltage of described first current rectifying and wave filtering circuit output
And export first voltage；
Second current rectifying and wave filtering circuit, is connected with described transforming circuit, and the first voltage for exporting described transforming circuit is carried out
Rectifying and wave-filtering simultaneously exports second voltage, described second current rectifying and wave filtering circuit include synchronous rectification chip, the 8th electrochemical capacitor, the tenth
Three resistance, the 14th resistance, the 15th resistance and the 16th resistance, described 13rd resistance, described 14th resistance and described
The resistance of the 15th resistance is the same；
Wherein, model csc7702 of described synchronous rectification chip, described 13rd resistance and two ends respectively with described transformation
The connection of sense pin, one end of described 14th resistance and the described synchronous rectification chip of circuit and described synchronous rectification chip
Set pin connect, the other end of described 14th resistance ground connection, the two ends of described 15th resistance respectively with described change piezoelectricity
The vcc pin of road and described synchronous rectification chip connects, and the gnd pin of described synchronous rectification chip is defeated with described Switching Power Supply
The negative pole going out end connects, and the drain pin of described synchronous rectification chip is connected with described transforming circuit, described 8th electrochemical capacitor
One end be connected with described 15th resistance, the other end of described 8th electrochemical capacitor is connected with the negative pole of described outfan, institute
State being connected in parallel with described 8th electrochemical capacitor and described outfan of the 16th resistance, the 16th resistance and described outfan
One end ground connection that negative pole connects；
Described anti thunder strike circuit includes electric fuse and varistor, and one end of described electric fuse is connected with the live wire of described external power source
Connect, one end of described varistor is connected with the other end of described electric fuse, the other end of described varistor and described outside
The zero line of power supply connects；
Described first current rectifying and wave filtering circuit includes full bridge rectifier, the first electrochemical capacitor, common mode inductance and the second electrochemical capacitor,
Described full bridge rectifier is connected with described anti thunder strike circuit and described common mode inductance respectively, and described first electrochemical capacitor is arranged on
Between described full bridge rectifier and described common mode inductance, and company in parallel with described common mode inductance with described full bridge rectifier
Connect, described second electrochemical capacitor is arranged between described common mode inductance and described circuit of reversed excitation, and in parallel with described common mode inductance
Connect, the minus earth of described second electrochemical capacitor, described common mode inductance includes first resistor and second resistance, described first electricity
The two ends of resistance are connected with the positive pole of described first electrochemical capacitor and the positive pole of described second electrochemical capacitor respectively, described second resistance
Two ends be connected with the negative pole of described first electrochemical capacitor and the negative pole of described second electrochemical capacitor respectively；
Described circuit of reversed excitation is provided with power supply control chip, model sp2618f of described power supply control chip, described power supply control
The vdd pin of coremaking piece is connected with 3rd resistor, the 4th resistant series, and described 3rd resistor is connected with described first resistor, the
The positive pole of four electrochemical capacitors is connected with the vdd pin of described power supply control chip, the negative pole of described 4th electrochemical capacitor with described
The negative pole of the second electrochemical capacitor connects, the nc pin of described power supply control chip and the 6th capacitance connection, described 6th electric capacity and
The negative pole of described second electrochemical capacitor connects, and the fb pin of described power supply control chip is connected with the tenth resistance, the 7th electric capacity and
Described tenth resistor coupled in parallel connects, and described 7th electric capacity and described tenth resistance are all grounded, the cs pipe of described power supply control chip
Foot is connected with the 11st resistance, and described 11st resistance is connected with the 12nd resistor coupled in parallel, described 11st resistance and described the
12 resistance are all grounded, and the drain pin of described power supply control chip is connected with described transforming circuit, described power supply control chip
Gnd pin ground connection；
Described transforming circuit is connected with described common mode inductance, and described transforming circuit is connected with the positive pole of the first diode, and described
The negative pole of one diode and the 6th resistance and the 5th resistant series, described 5th resistance and common mode inductance connection, the 3rd electric capacity with
Described 5th resistor coupled in parallel, described transforming circuit ground connection, described transforming circuit is connected with the positive pole of the second diode, and described second
The negative pole of diode is connected with the 7th resistance, and described 7th resistance is connected with described 3rd resistor, the 8th resistance and the 9th resistance
Be connected in parallel, described 8th resistance being connected in parallel and the two ends of described 9th resistance respectively with described transforming circuit and described electricity
The fb pin of source control chip connects, and described 8th resistance is the same with the resistance of described 9th resistance.
2. a kind of high efficiency switch power supply is it is characterised in that include:
Anti thunder strike circuit, is connected with described external power source, for protecting described Switching Power Supply and outer circuits；
First current rectifying and wave filtering circuit, is connected with described anti thunder strike circuit, and the voltage for inputting to described external power source carries out whole
Stream filtering；
Circuit of reversed excitation, is connected with described first current rectifying and wave filtering circuit；
Transforming circuit, is connected with described circuit of reversed excitation, for being converted the voltage of described first current rectifying and wave filtering circuit output
And export first voltage；
Second current rectifying and wave filtering circuit, is connected with described transforming circuit, and the first voltage for exporting described transforming circuit is carried out
Rectifying and wave-filtering simultaneously exports second voltage, described second current rectifying and wave filtering circuit include synchronous rectification chip, the 8th electrochemical capacitor, the tenth
Three resistance, the 14th resistance, the 15th resistance and the 16th resistance, described 13rd resistance, described 14th resistance and described
The resistance of the 15th resistance is the same.
3. according to claim 2 high efficiency switch power supply it is characterised in that the model of described synchronous rectification chip
Csc7702, described 13rd resistance and the two ends sense pin with described transforming circuit and described synchronous rectification chip respectively
Connect, one end of described 14th resistance is connected with the set pin of described synchronous rectification chip, described 14th resistance another
End ground connection, the two ends of described 15th resistance are connected with the vcc pin of described transforming circuit and described synchronous rectification chip respectively,
The gnd pin of described synchronous rectification chip is connected with the negative pole of the outfan of described Switching Power Supply, described synchronous rectification chip
Drain pin is connected with described transforming circuit, and one end of described 8th electrochemical capacitor is connected with described 15th resistance, and described
The other end of eight electrochemical capacitors is connected with the negative pole of described outfan, described 16th resistance with described 8th electrochemical capacitor and
Described outfan is connected in parallel, one end ground connection that the 16th resistance is connected with the negative pole of described outfan.
4. according to claim 3 high efficiency switch power supply it is characterised in that described anti thunder strike circuit includes electric fuse and pressure
Quick resistance, one end of described electric fuse is connected with the live wire of described external power source, one end of described varistor and described insurance
The other end of silk connects, and the other end of described varistor is connected with the zero line of described external power source.
5. according to claim 4 high efficiency switch power supply it is characterised in that described electric fuse be high pressure resistant electric fuse.
6. according to claim 5 high efficiency switch power supply it is characterised in that described first current rectifying and wave filtering circuit includes full-bridge
Rectification circuit, the first electrochemical capacitor, common mode inductance and the second electrochemical capacitor, described full bridge rectifier respectively with described anti-lightning
Circuit and described common mode inductance connect, described first electrochemical capacitor be arranged on described full bridge rectifier and described common mode inductance it
Between, and be connected in parallel with described common mode inductance with described full bridge rectifier, described second electrochemical capacitor is arranged on described common mode
Between inductance and described circuit of reversed excitation, and it is connected in parallel with described common mode inductance, the minus earth of described second electrochemical capacitor, institute
State common mode inductance and include first resistor and second resistance, the two ends of described first resistor are respectively with described first electrochemical capacitor just
The positive pole of pole and described second electrochemical capacitor connects, the two ends negative pole with described first electrochemical capacitor respectively of described second resistance
Connect with the negative pole of described second electrochemical capacitor.
7. according to claim 6 high efficiency switch power supply it is characterised in that described circuit of reversed excitation is provided with power supply core
Piece, model sp2618f of described power supply control chip, the vdd pin of described power supply control chip and 3rd resistor, the 4th electricity
Resistance is connected in series, and described 3rd resistor is connected with described first resistor, the positive pole of the 4th electrochemical capacitor and described power supply core
The vdd pin of piece connects, and the negative pole of described 4th electrochemical capacitor is connected with the negative pole of described second electrochemical capacitor, described power supply control
The nc pin of coremaking piece and the 6th capacitance connection, described 6th electric capacity is connected with the negative pole of described second electrochemical capacitor, described electricity
The fb pin of source control chip is connected with the tenth resistance, and the 7th electric capacity is connected with described tenth resistor coupled in parallel, described 7th electric capacity
All it is grounded with described tenth resistance, the cs pin of described power supply control chip is connected with the 11st resistance, described 11st resistance
It is connected with the 12nd resistor coupled in parallel, described 11st resistance and described 12nd resistance are all grounded, described power supply control chip
Drain pin is connected with described transforming circuit, the gnd pin ground connection of described power supply control chip.
8. according to claim 7 high efficiency switch power supply it is characterised in that described transforming circuit with described common mode inductance even
Connect, described transforming circuit is connected with the positive pole of the first diode, the negative pole of described first diode and the 6th resistance and the 5th electricity
Resistance series connection, described 5th resistance and common mode inductance connection, the 3rd electric capacity and described 5th resistor coupled in parallel, described transforming circuit connects
Ground, described transforming circuit is connected with the positive pole of the second diode, and the negative pole of described second diode is connected with the 7th resistance, described
7th resistance is connected with described 3rd resistor, and the 8th resistance and the 9th resistor coupled in parallel connect, described 8th resistance being connected in parallel
It is connected with the fb pin of described transforming circuit and described power supply control chip respectively with the two ends of described 9th resistance, the described 8th
Resistance is the same with the resistance of described 9th resistance.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620848412.5U CN205911962U (en) | 2016-08-08 | 2016-08-08 | High efficiency switching power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620848412.5U CN205911962U (en) | 2016-08-08 | 2016-08-08 | High efficiency switching power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI753801B (en) * | 2021-03-18 | 2022-01-21 | 通嘉科技股份有限公司 | Control methods for changing minimum on-time of synchronous rectifier and related synchronous rectifier controllers |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI753801B (en) * | 2021-03-18 | 2022-01-21 | 通嘉科技股份有限公司 | Control methods for changing minimum on-time of synchronous rectifier and related synchronous rectifier controllers |
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Granted publication date: 20170125 Termination date: 20190808 |