CN105141117B - The control circuit and method of Switching Power Supply - Google Patents
The control circuit and method of Switching Power Supply Download PDFInfo
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- CN105141117B CN105141117B CN201510676161.7A CN201510676161A CN105141117B CN 105141117 B CN105141117 B CN 105141117B CN 201510676161 A CN201510676161 A CN 201510676161A CN 105141117 B CN105141117 B CN 105141117B
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Abstract
The invention discloses a kind of control circuit of Switching Power Supply and methods.Wherein, this method includes：Switching power source chip；Protection module adjusts the guard interval of surge protection for carrying out surge protection to control circuit, wherein protection module includes multiple concatenated rectifier diodes, and the quantity of the corresponding rectifier diode of different guard intervals is different；Adjustment module, adjustment module are connected with protection module and switching power source chip respectively, the size of the input voltage for regulating switch power supply chip, wherein input voltage is that AC power flows through the first output voltage after protection module.The present invention solves the weak technical problem of switching power source control circuit Surge handling capability in the prior art.
Description
Technical field
The present invention relates to electronic technology fields, in particular to the control circuit and method of a kind of Switching Power Supply.
Background technology
In the prior art, external high frequency transformer is usually needed in the small-power switching power-supply of Width funtion input, works as access
When high frequency transformer, have a disadvantage that：
Disadvantage one：External high frequency transformer causes the cost of Switching Power Supply to increase in Switching Power Supply.
Disadvantage two：It is larger to occupy pcb board space for extraneous high frequency transformer in Switching Power Supply.
For in Switching Power Supply, usually increase varistor, carrys out resistance value surge current or surge voltage flows into switch electricity
Switching Power Supply in source controls chip, but forward direction surge 3KV or 4KV can pass through, but reverse surge 3KV or 4KV is then not all right.
For above-mentioned problem, currently no effective solution has been proposed.
Invention content
An embodiment of the present invention provides a kind of control circuit of Switching Power Supply and methods, in the prior art at least to solve
The weak technical problem of switching power source control circuit Surge handling capability.
One side according to the ... of the embodiment of the present invention provides a kind of control circuit of Switching Power Supply, including：Switching Power Supply
Chip；Protection module adjusts the guard interval of surge protection, wherein described for carrying out surge protection to the control circuit
Protection module includes multiple concatenated rectifier diodes, and the quantity of the corresponding rectifier diode of the difference guard interval is not
Together；And adjustment module, the adjustment module is connected with the protection module and the switching power source chip respectively, for adjusting
Save the size of the input voltage of the switching power source chip, wherein the input voltage is that AC power flows through the protection mould
The first output voltage after block.
Further, the adjustment module includes：First resistor, the first end of the first resistor and the AC power
Positive output end be connected, the second end of the first resistor is connected with the drain electrode end of the switching power source chip, wherein
The resistance value of the first resistor is 0 Ω；And zener diode, the first end phase of the zener diode and the first resistor
Connection, the second end of the zener diode are connected with the second end of the first resistor.
Further, the control circuit further includes：Feedback module, the feedback module and the switching power source chip phase
Connection, the second output voltage for adjusting the switching power source chip.
Further, the feedback module includes：Second resistance, the first end of the second resistance and the Switching Power Supply
The feedback input end of chip is connected, and the second end of the second resistance is connected with the source electrode of the switching power source chip；The
The first end of one capacitance, first capacitance is connected with the first end of the second resistance, the second end of first capacitance
It is connected with the second end of the second resistance；3rd resistor, the of the first end of the 3rd resistor and the second resistance
One end is connected, and the second end of the 3rd resistor is connected with the second end of first capacitance；And diode, described two
The first end of pole pipe is connected with the first end of first capacitance, and the of the second end of the diode and first capacitance
Two ends are connected.
Further, the control circuit further includes：Inductance, the first end of the inductance and the second of first capacitance
End is connected, and the second end of the inductance is connected with the second end of the diode；Second capacitance, the of second capacitance
One end is connected with the second end of the diode, the reversed-phase output of the second end and the AC power of second capacitance
It is connected；And fly-wheel diode, the first end of the fly-wheel diode is connected with the second end of the second resistance, described
The second end of fly-wheel diode is connected with the reversed-phase output of the AC power.
Further, the control circuit further includes：Filter module, the filter module respectively with the protection module and
The adjustment module is connected, and is filtered for the first output voltage to the protection module, so that the adjustment module
Adjust the size of first output voltage after filtered processing.
Further, the control circuit further includes：Varistor, the varistor are connected to the AC power
Both ends.
Another aspect according to the ... of the embodiment of the present invention additionally provides a kind of control method of Switching Power Supply, by among the above
The control circuit of any one of them Switching Power Supply carries out the control of Switching Power Supply, including：Detect the wave in the control circuit
Gush signal value；Compare the size of the surging signal value and default surging signal value, wherein the default surging signal value is institute
State control circuit protection module allow by the surging signal value maximum value；Comparing, the surging signal value is big
In the case of the default surging signal value, increase rectifier diode quantity in the protection module of the control circuit, wherein
The quantity of the corresponding rectifier diode of the different default surging signal value is different；And adjust the of the protection module
The size of one output voltage, so that first output voltage for flowing into the switching power source chip is less than predeterminated voltage, wherein
The predeterminated voltage is the maximum pressure voltage of the switching power source chip.
Further, before adjusting the size of the first output voltage of the protection module, the method includes：To institute
The first output voltage for stating protection module is filtered.
Further, the size for adjusting the first output voltage of the protection module includes：Judge filtered processing
Whether the first output voltage of the protection module afterwards is greater than or equal to the predeterminated voltage；Judging first output
In the case that voltage is greater than or equal to the predeterminated voltage, two pole of the voltage stabilizing in the adjustment module of the control circuit is controlled
Pipe is connected serially between the switching power source chip and the protection module；And judging first output voltage less than institute
In the case of stating predeterminated voltage, the first resistor controlled in the adjustment module is connected serially to the switching power source chip and institute
It states between protection module.
Further, the method includes：The feedback voltage for receiving the feedback module of the control circuit, described in adjusting
Second output voltage of the switching power source chip of control circuit.
In embodiments of the present invention, using switching power source chip；Protection module, for carrying out surge to the control circuit
Protection, adjusts the guard interval of surge protection, wherein the protection module includes multiple concatenated rectifier diodes, different institutes
The quantity for stating the corresponding rectifier diode of guard interval is different；Adjustment module, the adjustment module respectively with the protection
Module is connected with the switching power source chip, the size of the input voltage for adjusting the switching power source chip, wherein institute
State the mode that input voltage is the first output voltage that AC power flows through after the protection module.By adjusting protection module
The quantity of middle rectifier diode, to increase the guard interval of surge protection so that reverse surge can be normal through circuit；And it adopts
It is adjusted with adjustment module with to the AC power for flowing through protection module, so as to flow into the input voltage of switching power source chip
In safe range；The feedback voltage for receiving feedback module simultaneously carrys out the output voltage of regulating switch power supply, relative to existing skill
In art reverse surge cannot normal through the problem of, for the present invention by increasing multiple diodes, having reached reverse surge can be just
Often by the purpose of switching power source control circuit, and then solves switching power source control circuit Surge handling capability in the prior art
Weak technical problem improves the technique effect of Surge handling capability to realize by increasing rectifier diode quantity.
Description of the drawings
Attached drawing described herein is used to provide further understanding of the present invention, and is constituted part of this application, this hair
Bright illustrative embodiments and their description are not constituted improper limitations of the present invention for explaining the present invention.In the accompanying drawings：
Fig. 1 is a kind of schematic diagram of the control circuit of Switching Power Supply according to the ... of the embodiment of the present invention；
Fig. 2 is the schematic diagram of the control circuit of another optional Switching Power Supply according to the ... of the embodiment of the present invention；And
Fig. 3 is a kind of flow chart of the control method of Switching Power Supply according to the ... of the embodiment of the present invention.
Specific implementation mode
In order to enable those skilled in the art to better understand the solution of the present invention, below in conjunction in the embodiment of the present invention
Attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only
The embodiment of a part of the invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill people
The every other embodiment that member is obtained without making creative work should all belong to the model that the present invention protects
It encloses.
It should be noted that term " first " in description and claims of this specification and above-mentioned attached drawing, "
Two " etc. be for distinguishing similar object, without being used to describe specific sequence or precedence.It should be appreciated that using in this way
Data can be interchanged in the appropriate case, so as to the embodiment of the present invention described herein can in addition to illustrating herein or
Sequence other than those of description is implemented.In addition, term " comprising " and " having " and their any deformation, it is intended that cover
It includes to be not necessarily limited to for example, containing the process of series of steps or unit, method, system, product or equipment to cover non-exclusive
Those of clearly list step or unit, but may include not listing clearly or for these processes, method, product
Or the other steps or unit that equipment is intrinsic.
According to embodiments of the present invention, a kind of embodiment of the control circuit of Switching Power Supply is provided.
Fig. 1 is a kind of schematic diagram of the control circuit of Switching Power Supply according to the ... of the embodiment of the present invention, as shown in Figure 1, control
Circuit includes：Switching power source chip 10, protection module 20 and adjustment module 30, wherein：
In embodiments of the present invention, the selection of switching power source chip 10 is the switching power source chip of DC/DC models, and being used for will
The DC voltage received is converted to the normal working voltage of the connect load of control circuit.
Protection module 20 is used to carry out surge protection to control circuit, adjusts the guard interval of surge protection, wherein protection
Module 20 includes multiple concatenated rectifier diodes, and the quantity of the corresponding rectifier diode of different guard intervals is different.
Specifically, the moment for either closing being opened in Switching Power Supply will produce switching overvoltage (or overcurrent), the behaviour
Make overvoltage (either Overcurrent) and is properly termed as surge voltage (or referred to as surge current).In embodiments of the present invention,
Multiple concatenated rectifier diodes form protection module, wherein can be adjusted according to the value (or value of surge current) of surge voltage
Save the quantity of rectifier diode.
It should be noted that in embodiments of the present invention, the selection of protection module 20 is rectifier diode, rectifier diode
The protection domain of surge voltage (or surge current) can not only be increased, it can also be to flowing into AC power AC in control circuit
Rectification is carried out, DC power supply is obtained.
Adjustment module 30 is connected with protection module 20 and switching power source chip 10 respectively, is used for regulating switch power supply chip
Input voltage size, wherein input voltage be AC power flow through the first output voltage after protection module.
Specifically, after carrying out rectification processing to AC power AC by the rectifier diode of protection module, first is obtained
Output voltage.Wherein, the first output voltage is input to before switching power source chip, and the first output voltage of adjustment module pair is adjusted
Section ensures the normal work of switching power source chip so that the first output voltage is less than the maximum pressure voltage of switching power source chip.
In embodiments of the present invention, by adjusting the quantity of rectifier diode in protection module, to increase surge protection
Guard interval so that reverse surge can be normal through circuit；And use alternating current of the adjustment module to flowing through protection module
Source is adjusted, so as to flow into the input voltage of switching power source chip in safe range；Receive the anti-of feedback module simultaneously
Feedthrough voltage carrys out the output voltage of regulating switch power supply, compared with the existing technology in reverse surge cannot normal through the problem of, this
Invention has achieved the purpose that reverse surge can be normal through switching power source control circuit, in turn by increasing multiple diodes
Solve the weak technical problem of switching power source control circuit Surge handling capability in the prior art, it is whole by increasing to realize
Number of diodes is flowed to improve the technique effect of Surge handling capability.
Fig. 2 is the schematic diagram of the control circuit of another optional Switching Power Supply according to the ... of the embodiment of the present invention, such as Fig. 2 institutes
Show, protection module 20 includes rectifier diode D2 and rectifier diode D3.
Fig. 2 show the low power switching power source control circuit of buck chopper, by AC power AC input, prime parallel connection pressure
Quick resistance RV1 is released a certain amount of surge voltage (or surge current) by varistor RV1；Then series rectifier diode
D2 rectifications, for example, when cannot resist 3000V surge voltages by when, in control circuit increase it is identical as rectifier diode D2
Rectifier diode D3.If series rectifier diode D3 cannot still resist the surge voltage of 3000V, two pole of rectification is continued growing
The quantity of pipe, until the rectifier diode being connected serially in control circuit can allow the surge voltage safety of 3000V to control electricity
Road.In fig. 2, protection module 20 only provides two rectifier diodes, and particular user can increase rectifier diode as needed
Quantity.
Optionally, control circuit includes：Filter module, filter module are connected with protection module and adjustment module respectively,
Be filtered for the first output voltage to protection module so that adjustment module adjust after filtered processing it is first defeated
Go out the size of voltage.
Specifically, AC power AC, need to be by the first output voltage after the rectifies in protection module
It is filtered, and then using the first output voltage after filtering as the input voltage of switching power source chip.Such as Fig. 2 institutes
Show, inductance L1 and capacitance C3 constitute filter module, and inductance L1 filters out DM EMI, and inhibits transient current to a certain extent；
Capacitance C3 is flat wave electrolytic capacitor.
Optionally, as shown in Fig. 2, adjustment module 30 includes first resistor R1 and zener diode D1, wherein：
The first end of first resistor R1 is connected with the positive output end of AC power, the second end of first resistor R1 with open
The drain electrode end D of powered-down source chip is connected, wherein the resistance value of first resistor is 0 Ω.
Zener diode D1 is connected with the first end of first resistor R1, the second end and first resistor of zener diode D1
The second end of R1 is connected.
Specifically, after the filtered processing of the first output voltage, if the first output voltage is higher than in switching power source chip
0.8 times of pressure voltage of mos pipes is set, then selection series voltage stabilizing diode between the drain D and capacitance C3 of switching power source chip 10
D1, so that zener diode D1 is divided, and using the first output voltage after partial pressure as the defeated of switching power source chip 10
Enter voltage；If the first output voltage is less than built in switching power source chip 10 when 0.8 times of pressure voltage of mos pipes, the positions D1 use 0 Ω the
One resistance R1 is replaced, at this point, 0 Ω first resistors R1 is by zener diode D1 short circuits, but is not divided the first output voltage
Pressure, to ensure the stable voltage value of switching power source chip output.
In control circuit provided by the invention, control is reached by the mutual switching of zener diode D1 and first resistor R1
The Width funtion of circuit processed inputs, and entire control circuit is not necessarily to, in the external high frequency transformer of switching power source chip, have cost
Advantage that is low and occupying smaller pcb board space.
Optionally, as shown in Fig. 2, control circuit includes feedback module 40, feedback module 40 and 10 phase of switching power source chip
Connection is used for the second output voltage Vout of regulating switch power supply chip 10.According to the voltage value that feedback module 40 is fed back, to control
The value of second output voltage Vout of switching power source chip 10 processed, so that the second output voltage Vout of switching power source chip 10
Value meets the normal operation of load.Wherein, load can be water dispenser, and humidifier and water heater etc. install Switching Power Supply control
The equipment of circuit.
Further, feedback module 40 includes second resistance R2, the first capacitance C1,3rd resistor R3, diode D4,
In, the first end of second resistance R2 is connected with the feedback input end FB of switching power source chip, the second end of second resistance R2 with
The source S of switching power source chip is connected；The first end of first capacitance C1 is connected with the first end of second resistance R2, the first electricity
The second end for holding C1 is connected with the second end of second resistance R2；The first end of the first end and second resistance R2 of 3rd resistor R3
It is connected, the second end of 3rd resistor R3 is connected with the second end of the first capacitance C1；The first end of diode D4 and the first electricity
The first end for holding C1 is connected, and the second end of diode D4 is connected with the second end of the first capacitance C1.
Specifically, second resistance R2, the first capacitance C1,3rd resistor R3 and diode D4 constitute feedback module, wherein
From second resistance R2 and 3rd resistor R3 jointly with adjust feedback module and feed back to the feedback voltage of switching power source chip.
Optionally, as shown in Fig. 2, control circuit includes inductance L2, the second capacitance C2, sustained diode 5, wherein：Inductance
The first end of L2 is connected with the second end of the first capacitance C1, and the second end of inductance L2 is connected with the second end of diode D4；
The first end of second capacitance C2 is connected with the second end of diode D4, the reverse phase of the second end and AC power of the second capacitance C2
Output end is connected；The first end of sustained diode 5 is connected with the second end of second resistance R2, and the of sustained diode 5
Two ends are connected with the reversed-phase output of AC power.
Specifically, inductance L2 is power filter inductance；D5 is to continue to stay diode；Second capacitance C2 feeds back to for feedback module
The filter capacitor of switching power source chip.As shown in Fig. 2, control circuit further includes the shunt capacitance C4 of switching power source chip, the electricity
Hold the both ends that C4 is connected to the BP pins and S pins of switching power source chip.
According to embodiments of the present invention, a kind of embodiment of the method for the control method of Switching Power Supply is provided, this method can be with
The control circuit for any Switching Power Supply that the above is provided through the embodiment of the present invention carries out the control of Switching Power Supply, needs
It is noted that step shown in the flowchart of the accompanying drawings can be in the computer system of such as a group of computer-executable instructions
Middle execution, although also, logical order is shown in flow charts, and it in some cases, can be with different from herein
Sequence executes shown or described step.
Fig. 3 is a kind of flow chart of the control method of Switching Power Supply according to the ... of the embodiment of the present invention, as shown in figure 3, the party
Method includes the following steps S102 to step S108：
Step S102 detects the surging signal value in control circuit.
Specifically, the moment for either closing being opened in Switching Power Supply will produce switching overvoltage (or overcurrent), the behaviour
Make overvoltage (either Overcurrent) and be properly termed as surge voltage (or referred to as surge current), wherein the value of surge voltage
Or the primary system of surge current is known as surging signal value.In embodiments of the present invention, multiple concatenated rectifier diode compositions are protected
Protect module, wherein the quantity of rectifier diode can be adjusted according to the value (or value of surge current) of surge voltage.
Step S104 compares the size of surging signal value and default surging signal value, wherein default surging signal value is to protect
Shield module allow by surging signal value maximum value.
The surging signal value detected is compared with default surging signal value, for example, by the value of surge voltage and in advance
If the value of surge voltage is compared, the value of surge current can also be compared with the value of default surge current.For sentencing
Disconnected surge voltage (or surge current) whether be more than protection module allow by surging signal value maximum value, and then ensure
The safe normal operation of control circuit.
Step S106 increases in the case where comparing surging signal value more than default surging signal value in protection module
Rectifier diode quantity, wherein the quantity of the corresponding rectifier diode of the default surging signal value of difference is different.
If comparing surging signal value is more than default surging signal value, at this point, in order to ensure surge voltage (or surge electricity
Stream) normal through control circuit, then increase the quantity of rectifier diode in protection module, surging signal value is preset to increase.
If after again, increasing varistor in the control circuit of Switching Power Supply, positive surge voltage (or positive surge electricity
Stream) it can be normal through control circuit.For example, when positive surge voltage value is 3KV or 4KV, which being capable of positive normal open
It crosses, but reverse surge voltage 3KV or 4KV then cannot be normal through control circuits, at this point, can increase rectification in protection module
The quantity of diode, come solve the problems, such as reverse surge voltage (or reverse surge current) cannot normal through control circuit,
Wherein, the quantity of increased rectifier diode can be added according to actual conditions.
Step S108 adjusts the size of the first output voltage of protection module, so as to flow into the first of switching power source chip
Output voltage is less than predeterminated voltage, wherein predeterminated voltage is the maximum pressure voltage of switching power source chip.
Specifically, after carrying out rectification processing to AC power AC by the rectifier diode of protection module, first is obtained
Output voltage.Wherein, the first output voltage is input to before switching power source chip, and the first output voltage of adjustment module pair is adjusted
Section ensures the normal work of switching power source chip so that the first output voltage is less than the maximum pressure voltage of switching power source chip.Its
In, which is the value of predeterminated voltage.
In embodiments of the present invention, by adjusting the quantity of rectifier diode in protection module, to increase surge protection
Guard interval so that reverse surge can be normal through circuit；And use alternating current of the adjustment module to flowing through protection module
Source is adjusted, so as to flow into the input voltage of switching power source chip in safe range；Receive the anti-of feedback module simultaneously
Feedthrough voltage carrys out the output voltage of regulating switch power supply, compared with the existing technology in reverse surge cannot normal through the problem of, this
Invention has achieved the purpose that reverse surge can be normal through switching power source control circuit, in turn by increasing multiple diodes
Solve the weak technical problem of switching power source control circuit Surge handling capability in the prior art, it is whole by increasing to realize
Number of diodes is flowed to improve the technique effect of Surge handling capability.
Optionally, before adjusting the size of the first output voltage of protection module, Switching Power Supply provided by the invention
Control method further includes step S1：First output voltage of protection module is filtered, specifically, AC power AC is by protecting
It protects after mould rectifies in the block, the first output voltage need to be filtered, and then by the after filtering
Input voltage of one output voltage as switching power source chip.
Optionally, the size of the first output voltage of step S108 adjustings protection module includes the following steps S1081 to step
Rapid S1085：
Step S1081, judges whether the first output voltage of the protection module after filtered processing is greater than or equal to
Predeterminated voltage.
Step S1083 controls to adjust module in the case where judging that the first output voltage is greater than or equal to predeterminated voltage
In zener diode be connected serially between switching power source chip and protection module.
Step S1085 controls to adjust mould in the block the in the case where judging that the first output voltage is less than predeterminated voltage
One resistance is connected serially between switching power source chip and protection module.
Specifically, after the filtered processing of the first output voltage, if the first output voltage is higher than in switching power source chip
0.8 times of pressure voltage for setting mos pipes, then select series voltage stabilizing diode, so that zener diode is divided, and will be after partial pressure
Input voltage of first output voltage as switching power source chip；If the first output voltage is less than built in switching power source chip
When 0.8 times of pressure voltage of mos pipes, zener diode is replaced using 0 Ω first resistors, at this point, 0 Ω first resistors are by zener diode
Short circuit, but the first output voltage is not divided, to ensure the stable voltage value of switching power source chip output.Wherein,
0.8 times of pressure voltage of mos pipes built in switching power source chip is the value of predeterminated voltage.
Optionally, the control method of Switching Power Supply provided by the invention further includes step S2：Receive the feedback of feedback module
Voltage, with the second output voltage of regulating switch power supply chip.According to the voltage value that feedback module is fed back, to control Switching Power Supply
Second output voltage values of chip, so that the second output voltage values of switching power source chip meet the normal operation of load.Wherein,
Load can be water dispenser, the equipment that humidifier and water heater etc. install switching power source control circuit.
The embodiments of the present invention are for illustration only, can not represent the quality of embodiment.
In the above embodiment of the present invention, all emphasizes particularly on different fields to the description of each embodiment, do not have in some embodiment
The part of detailed description may refer to the associated description of other embodiment.
In several embodiments provided herein, it should be understood that disclosed technology contents can pass through others
Mode is realized.Wherein, the apparatus embodiments described above are merely exemplary, for example, the unit division, Ke Yiwei
A kind of division of logic function, formula that in actual implementation, there may be another division manner, such as multiple units or component can combine or
Person is desirably integrated into another system, or some features can be ignored or not executed.Another point, shown or discussed is mutual
Between coupling, direct-coupling or communication connection can be INDIRECT COUPLING or communication link by some interfaces, unit or module
It connects, can be electrical or other forms.
The unit illustrated as separating component may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, you can be located at a place, or may be distributed over multiple
On unit.Some or all of unit therein can be selected according to the actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, it can also
It is that each unit physically exists alone, it can also be during two or more units be integrated in one unit.Above-mentioned integrated list
The form that hardware had both may be used in member is realized, can also be realized in the form of SFU software functional unit.
If the integrated unit is realized in the form of SFU software functional unit and sells or use as independent product
When, it can be stored in a computer read/write memory medium.Based on this understanding, technical scheme of the present invention is substantially
The all or part of the part that contributes to existing technology or the technical solution can be in the form of software products in other words
It embodies, which is stored in a storage medium, including some instructions are used so that a computer
Equipment (can be personal computer, server or network equipment etc.) execute each embodiment the method for the present invention whole or
Part steps.And storage medium above-mentioned includes：USB flash disk, read-only memory (ROM, Read-Only Memory), arbitrary access are deposited
Reservoir (RAM, Random Access Memory), mobile hard disk, magnetic disc or CD etc. are various can to store program code
Medium.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of control circuit of Switching Power Supply, which is characterized in that including：
Switching power source chip；
Protection module adjusts the guard interval of surge protection, wherein described for carrying out surge protection to the control circuit
Protection module includes multiple concatenated rectifier diodes, and the quantity of the corresponding rectifier diode of the difference guard interval is not
Together；And
Adjustment module, the adjustment module is connected with the protection module and the switching power source chip respectively, for adjusting
The size of the input voltage of the switching power source chip, wherein the input voltage is that AC power flows through the protection module
The first output voltage later；
Wherein, the adjustment module includes：
First resistor, the first end of the first resistor is through the protection module, the positive output end phase with the AC power
Connection, the second end of the first resistor are connected with the drain electrode end of the switching power source chip, wherein the first resistor
Resistance value is 0 Ω；And
Zener diode, the first end of the zener diode are connected with the first end of the first resistor, the voltage stabilizing two
The second end of pole pipe is connected with the second end of the first resistor；
Wherein, it if first output voltage is higher than 0.8 times of pressure voltage of mos pipes built in the switching power source chip, selects
The series voltage stabilizing diode between the drain electrode and capacitance of the switching power source chip；If first output voltage is opened less than described
When 0.8 times of pressure voltage of mos pipes built in powered-down source chip, the zener diode is replaced using the first resistor.
2. control circuit according to claim 1, which is characterized in that the control circuit further includes：
Feedback module, the feedback module are connected with the switching power source chip, for adjusting the switching power source chip
Second output voltage.
3. control circuit according to claim 2, which is characterized in that the feedback module includes：
Second resistance, the first end of the second resistance are connected with the feedback input end of the switching power source chip, and described
The second end of two resistance is connected with the source electrode of the switching power source chip；
The first end of first capacitance, first capacitance is connected with the first end of the second resistance, first capacitance
Second end is connected with the second end of the second resistance；
3rd resistor, the first end of the 3rd resistor are connected with the first end of the second resistance, the 3rd resistor
Second end is connected with the first end of first capacitance；And
Diode, the first end of the diode are connected with the first end of first capacitance, the second end of the diode
It is connected with the second end of first capacitance.
4. control circuit according to claim 3, which is characterized in that the control circuit further includes：
Inductance, the first end of the inductance are connected with the second end of first capacitance, the second end of the inductance with it is described
The second end of diode is connected；
The first end of second capacitance, second capacitance is connected with the second end of the diode, and the of second capacitance
Two ends are connected with the inverse output terminal of the AC power；And
Fly-wheel diode, the first end of the fly-wheel diode are connected with the second end of the second resistance, the afterflow two
The second end of pole pipe is connected with the inverse output terminal of the AC power.
5. control circuit according to claim 1, which is characterized in that the control circuit further includes：
Filter module, the filter module are connected with the protection module and the adjustment module respectively, for the guarantor
First output voltage of shield module is filtered so that the adjustment module adjust after filtered processing it is described first defeated
Go out the size of voltage.
6. control circuit according to claim 1, which is characterized in that the control circuit further includes：
Varistor, the varistor are connected to the both ends of the AC power.
7. a kind of control method of Switching Power Supply, which is characterized in that pass through switch according to any one of claims 1 to 6 electricity
The control circuit in source carries out the control of Switching Power Supply, the method includes：
Detect the surging signal value in the control circuit；
Compare the size of the surging signal value and default surging signal value, wherein the default surging signal value is the control
The protection module of circuit processed allow by the surging signal value maximum value；
In the case where comparing the surging signal value more than the default surging signal value, increase the guarantor of the control circuit
Protect rectifier diode quantity in module, wherein the quantity of the corresponding rectifier diode of the different default surging signal value
It is different；And
The size of the first output voltage of the protection module is adjusted, so that flow into the switching power source chip described first is defeated
Go out voltage and be less than predeterminated voltage, wherein the predeterminated voltage is the maximum pressure voltage of the switching power source chip.
8. control method according to claim 7, which is characterized in that in the first output voltage for adjusting the protection module
Size before, the method includes：
First output voltage of the protection module is filtered.
9. control method according to claim 8, which is characterized in that adjust the first output voltage of the protection module
Size includes：
Judge whether the first output voltage of the protection module after filtered processing is greater than or equal to the default electricity
Pressure；
In the case where judging that first output voltage is greater than or equal to the predeterminated voltage, the control circuit is controlled
The zener diode in adjustment module is connected serially between the switching power source chip and the protection module；And
In the case where judging that first output voltage is less than the predeterminated voltage, control described in the adjustment module
First resistor is connected serially between the switching power source chip and the protection module.
10. control method according to claim 7, which is characterized in that the method includes：
The feedback voltage for receiving the feedback module of the control circuit, to adjust the of the switching power source chip of the control circuit
Two output voltages.
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| FR3105378A1 (en) * | 2019-12-18 | 2021-06-25 | Valeo Systemes Thermiques | Fluid heating device, in particular intended for a vehicle |
| CN113676066A (en) * | 2021-08-31 | 2021-11-19 | 深圳市雅晶源科技有限公司 | EMI shielding system of gallium nitride quick charging source |
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| CN203504137U (en) * | 2013-07-29 | 2014-03-26 | 九阳股份有限公司 | Induction cooker with surge protection |
| CN203574558U (en) * | 2013-11-14 | 2014-04-30 | 深圳市航天泰瑞捷电子有限公司 | Non-isolated wide voltage input switch power supply |
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| US20070114981A1 (en) * | 2005-11-21 | 2007-05-24 | Square D Company | Switching power supply system with pre-regulator for circuit or personnel protection devices |
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| CN203504137U (en) * | 2013-07-29 | 2014-03-26 | 九阳股份有限公司 | Induction cooker with surge protection |
| JP2015033187A (en) * | 2013-08-01 | 2015-02-16 | 株式会社東芝 | Current-limiting reactor |
| CN203574558U (en) * | 2013-11-14 | 2014-04-30 | 深圳市航天泰瑞捷电子有限公司 | Non-isolated wide voltage input switch power supply |
| CN104901575A (en) * | 2014-03-05 | 2015-09-09 | 株式会社东芝 | Inverter controller, power converter, and car |
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