CN105141117A - Control circuit and method for switching power supply - Google Patents
Control circuit and method for switching power supply Download PDFInfo
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- CN105141117A CN105141117A CN201510676161.7A CN201510676161A CN105141117A CN 105141117 A CN105141117 A CN 105141117A CN 201510676161 A CN201510676161 A CN 201510676161A CN 105141117 A CN105141117 A CN 105141117A
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Abstract
The invention discloses a control circuit and a control method of a switching power supply. Wherein, the method comprises the following steps: a switching power supply chip; the protection module is used for performing surge protection on the control circuit and adjusting a protection interval of the surge protection, wherein the protection module comprises a plurality of rectifier diodes which are connected in series, and the number of the rectifier diodes corresponding to different protection intervals is different; and the adjusting module is respectively connected with the protection module and the switching power supply chip and is used for adjusting the input voltage of the switching power supply chip, wherein the input voltage is a first output voltage of the alternating current power supply after flowing through the protection module. The invention solves the technical problem that the anti-surge capacity of the switching power supply control circuit in the prior art is weak.
Description
Technical field
The present invention relates to electronic technology field, in particular to a kind of control circuit and method of Switching Power Supply.
Background technology
In the prior art, usually needing external high frequency transformer in the small-power switching power-supply of Width funtion input, when accessing high frequency transformer, having following shortcoming:
Shortcoming one: external high frequency transformer causes the cost of Switching Power Supply to raise in Switching Power Supply.
Shortcoming two: to take pcb board space larger for extraneous high frequency transformer in Switching Power Supply.
For in Switching Power Supply, usually increase piezo-resistance, come resistance surge current or surge voltage and flow into Switching Power Supply control chip in Switching Power Supply, but forward surge 3KV or 4KV by, but reverse surge 3KV or 4KV is then not all right.
For above-mentioned problem, at present effective solution is not yet proposed.
Summary of the invention
Embodiments provide a kind of control circuit and method of Switching Power Supply, at least to solve the weak technical problem of switching power source control circuit Surge handling capability of the prior art.
According to an aspect of the embodiment of the present invention, provide a kind of control circuit of Switching Power Supply, comprising: switching power source chip; Protection module, for carrying out surge protection to described control circuit, regulate the guard interval of surge protection, wherein, described protection module comprises the rectifier diode of multiple series connection, and the quantity of the described rectifier diode that different described guard interval is corresponding is different; And adjustment module; described adjustment module is connected with described switching power source chip with described protection module respectively; for regulating the size of the input voltage of described switching power source chip, wherein, described input voltage is the first output voltage that AC power flows through after described protection module.
Further, described adjustment module comprises: the first resistance, and the first end of described first resistance is connected with the forward output of described AC power, and the second end of described first resistance is connected with the drain electrode end of described switching power source chip, wherein, the resistance of described first resistance is 0 Ω; And voltage stabilizing didoe, described voltage stabilizing didoe is connected with the first end of described first resistance, and the second end of described voltage stabilizing didoe is connected with the second end of described first resistance.
Further, described control circuit also comprises: feedback module, and described feedback module is connected with described switching power source chip, for regulating the second output voltage of described switching power source chip.
Further, described feedback module comprises: the second resistance, and the first end of described second resistance is connected with the feedback input end of described switching power source chip, and the second end of described second resistance is connected with the source electrode of described switching power source chip; First electric capacity, the first end of described first electric capacity is connected with the first end of described second resistance, and the second end of described first electric capacity is connected with the second end of described second resistance; 3rd resistance, the first end of described 3rd resistance is connected with the first end of described second resistance, and the second end of described 3rd resistance is connected with the second end of described first electric capacity; And diode, the first end of described diode is connected with the first end of described first electric capacity, and the second end of described diode is connected with the second end of described first electric capacity.
Further, described control circuit also comprises: inductance, and the first end of described inductance is connected with the second end of described first electric capacity, and the second end of described inductance is connected with the second end of described diode; Second electric capacity, the first end of described second electric capacity is connected with the second end of described diode, and the second end of described second electric capacity is connected with the reversed-phase output of described AC power; And fly-wheel diode, the first end of described fly-wheel diode is connected with the second end of described second resistance, and the second end of described fly-wheel diode is connected with the reversed-phase output of described AC power.
Further; described control circuit also comprises: filtration module; described filtration module is connected with described adjustment module with described protection module respectively; for carrying out filtering to the first output voltage of described protection module, with the size making described adjustment module regulate described first output voltage after process after filtering.
Further, described control circuit also comprises: piezo-resistance, and described piezo-resistance is connected to the two ends of described AC power.
According to the another aspect of the embodiment of the present invention, additionally provide a kind of control method of Switching Power Supply, carried out the control of Switching Power Supply by the control circuit of the Switching Power Supply according to any one of above-mentioned, comprising: detect the surging signal value in described control circuit; The size of more described surging signal value and default surging signal value, wherein, described default surging signal value is the maximum that the protection module of described control circuit allows the described surging signal value passed through; When comparing described surging signal value and being greater than described default surging signal value, increase rectifier diode quantity in the protection module of described control circuit, wherein, the quantity of the described rectifier diode that different described default surging signal value is corresponding is different; And regulate the size of the first output voltage of described protection module, to make described first output voltage of the described switching power source chip of inflow be less than predeterminated voltage, wherein, described predeterminated voltage is the maximum withstand voltage of described switching power source chip.
Further, before the size of the first output voltage regulating described protection module, described method comprises: carry out filtering to the first output voltage of described protection module.
Further, the size of the first output voltage of described protection module is regulated to comprise: to judge whether the first output voltage of the described protection module after process is after filtering more than or equal to described predeterminated voltage; When judging that described first output voltage is more than or equal to described predeterminated voltage, the described voltage stabilizing didoe controlled in the adjustment module of described control circuit is connected serially between described switching power source chip and described protection module; And when judging that described first output voltage is less than described predeterminated voltage, control described first resistant series in described adjustment module between described switching power source chip and described protection module.
Further, described method comprises: the feedback voltage receiving the feedback module of described control circuit, to regulate the second output voltage of the switching power source chip of described control circuit.
In embodiments of the present invention, switching power source chip is adopted; Protection module, for carrying out surge protection to described control circuit, regulate the guard interval of surge protection, wherein, described protection module comprises the rectifier diode of multiple series connection, and the quantity of the described rectifier diode that different described guard interval is corresponding is different; Adjustment module; described adjustment module is connected with described switching power source chip with described protection module respectively; for regulating the size of the input voltage of described switching power source chip, wherein, described input voltage is the mode that AC power flows through the first output voltage after described protection module.By regulating the quantity of rectifier diode in protection module, to increase the guard interval of surge protection, make reverse surge can normal through circuit; And adopt adjustment module to regulate with to the AC power flowing through protection module, to make the input voltage flowing into switching power source chip in safe range; The feedback voltage simultaneously receiving feedback module carrys out the output voltage of by-pass cock power supply, relative to reverse surge in prior art can not normal through problem, the present invention is by increasing multiple diode, reaching reverse surge can normal through the object of switching power source control circuit, and then solve the weak technical problem of switching power source control circuit Surge handling capability of the prior art, thus achieve the technique effect improving Surge handling capability by increasing rectifier diode quantity.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the schematic diagram of the control circuit of a kind of Switching Power Supply according to the embodiment of the present invention;
Fig. 2 is the schematic diagram of the control circuit according to the optional Switching Power Supply of the another kind of the embodiment of the present invention; And
Fig. 3 is the flow chart of the control method of a kind of Switching Power Supply according to the embodiment of the present invention.
Embodiment
The present invention program is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the embodiment of a part of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, should belong to the scope of protection of the invention.
It should be noted that, term " first ", " second " etc. in specification of the present invention and claims and above-mentioned accompanying drawing are for distinguishing similar object, and need not be used for describing specific order or precedence.Should be appreciated that the data used like this can be exchanged in the appropriate case, so as embodiments of the invention described herein can with except here diagram or describe those except order implement.In addition, term " comprises " and " having " and their any distortion, intention is to cover not exclusive comprising, such as, contain those steps or unit that the process of series of steps or unit, method, system, product or equipment is not necessarily limited to clearly list, but can comprise clearly do not list or for intrinsic other step of these processes, method, product or equipment or unit.
According to the embodiment of the present invention, provide a kind of embodiment of control circuit of Switching Power Supply.
Fig. 1 is the schematic diagram of the control circuit of a kind of Switching Power Supply according to the embodiment of the present invention, and as shown in Figure 1, control circuit comprises: switching power source chip 10, protection module 20 and adjustment module 30, wherein:
In embodiments of the present invention, what switching power source chip 10 was chosen is the switching power source chip of DC/DC model, for the direct voltage received is converted to control circuit connect the normal working voltage of load.
Protection module 20 is for carrying out surge protection to control circuit, and regulate the guard interval of surge protection, wherein, protection module 20 comprises the rectifier diode of multiple series connection, and the quantity of the rectifier diode that different guard interval is corresponding is different.
Particularly, in the moment that Switching Power Supply is opened or closed, can produce switching overvoltage (or overcurrent), this switching overvoltage (or Overcurrent) can be called surge voltage (or being called surge current).In embodiments of the present invention, the rectifier diode composition protection module of multiple series connection, wherein, can regulate the quantity of rectifier diode according to the value of surge voltage (or value of surge current).
It should be noted that; in embodiments of the present invention, what protection module 20 was chosen is rectifier diode, and rectifier diode can not only increase the protection range of surge voltage (or surge current); rectification can also be carried out to AC power AC in inflow control circuit, obtain DC power supply.
Adjustment module 30 is connected with switching power source chip 10 with protection module 20 respectively, and for the size of the input voltage of by-pass cock power supply chip, wherein, input voltage is the first output voltage after AC power flows through protection module.
Particularly, after by the rectifier diode of protection module rectification process being carried out to AC power AC, the first output voltage is obtained.Wherein, before the first output voltage inputs to switching power source chip, adjustment module regulates the first output voltage, with the maximum withstand voltage making the first output voltage be less than switching power source chip, ensures the normal work of switching power source chip.
In embodiments of the present invention, by regulating the quantity of rectifier diode in protection module, to increase the guard interval of surge protection, make reverse surge can normal through circuit; And adopt adjustment module to regulate with to the AC power flowing through protection module, to make the input voltage flowing into switching power source chip in safe range; The feedback voltage simultaneously receiving feedback module carrys out the output voltage of by-pass cock power supply, relative to reverse surge in prior art can not normal through problem, the present invention is by increasing multiple diode, reaching reverse surge can normal through the object of switching power source control circuit, and then solve the weak technical problem of switching power source control circuit Surge handling capability of the prior art, thus achieve the technique effect improving Surge handling capability by increasing rectifier diode quantity.
Fig. 2 is the schematic diagram of the control circuit according to the optional Switching Power Supply of the another kind of the embodiment of the present invention, and as shown in Figure 2, protection module 20 comprises rectifier diode D2 and rectifier diode D3.
Figure 2 shows that the low power switching power source control circuit of buck chopper, inputted by AC power AC, prime piezo-resistance RV1 in parallel, to be released a certain amount of surge voltage (or surge current) by piezo-resistance RV1; Then series rectifier diode D2 rectification, such as, when can not resist 3000V surge voltage by time, in control circuit, increase the rectifier diode D3 identical with rectifier diode D2.The rectifier diode be connected serially in control circuit if series rectifier diode D3 still can not resist the surge voltage of 3000V, then continues to increase the quantity of rectifier diode, until can allow the surge voltage safety control circuit of 3000V.In fig. 2, protection module 20 only provides two rectifier diodes, and particular user can increase the quantity of rectifier diode as required.
Alternatively; control circuit comprises: filtration module; filtration module is connected with adjustment module with protection module respectively, for carrying out filtering to the first output voltage of protection module, with the size making adjustment module regulate the first output voltage after process after filtering.
Particularly, after the rectifies of AC power AC in protection module, the first output voltage need be carried out filtering process, and then using the input voltage of the first output voltage after filtering as switching power source chip.As shown in Figure 2, inductance L 1 and electric capacity C3 form filtration module, inductance L 1 filtering differential mode interference, and suppress transient current to a certain extent; Electric capacity C3 is flat ripple electrochemical capacitor.
Alternatively, as shown in Figure 2, adjustment module 30 comprises the first resistance R1 and voltage stabilizing didoe D1, wherein:
The first end of the first resistance R1 is connected with the forward output of AC power, and second end of the first resistance R1 is connected with the drain electrode end D of switching power source chip, and wherein, the resistance of the first resistance is 0 Ω.
Voltage stabilizing didoe D1 is connected with the first end of the first resistance R1, and second end of voltage stabilizing didoe D1 is connected with second end of the first resistance R1.
Particularly, after first output voltage processes after filtering, if the first output voltage is higher than 0.8 times of withstand voltage of the built-in mos pipe of switching power source chip, then select series voltage stabilizing diode D1 between the drain D and electric capacity C3 of switching power source chip 10, to make voltage stabilizing didoe D1 carry out dividing potential drop, and using the input voltage of the first output voltage after dividing potential drop as switching power source chip 10; If during the first output voltage mos pipe 0.8 times withstand voltage built-in lower than switching power source chip 10, D1 position uses 0 Ω first resistance R1 to replace, now, 0 Ω first resistance R1 is by voltage stabilizing didoe D1 short circuit, but dividing potential drop is not carried out to the first output voltage, thus ensure the magnitude of voltage of switching power source chip stable output.
In control circuit provided by the invention, the Width funtion being reached control circuit by the mutual switching of voltage stabilizing didoe D1 and the first resistance R1 is inputted, and whole control circuit, without the need at the external high frequency transformer of switching power source chip, has the low advantage with taking less pcb board space of cost.
Alternatively, as shown in Figure 2, control circuit comprises feedback module 40, and feedback module 40 is connected with switching power source chip 10, for the second output voltage Vout of by-pass cock power supply chip 10.According to the magnitude of voltage that feedback module 40 feeds back, carry out the value of the second output voltage Vout of control switch power supply chip 10, meet the normal operation of load with the value of the second output voltage Vout making switching power source chip 10.Wherein, load can be water dispenser, and the equipment of switching power source control circuit installed by humidifier and water heater etc.
Further, feedback module 40 comprises the second resistance R2, the first electric capacity C1, the 3rd resistance R3, diode D4, wherein, the first end of the second resistance R2 is connected with the feedback input end FB of switching power source chip, and second end of the second resistance R2 is connected with the source S of switching power source chip; The first end of the first electric capacity C1 is connected with the first end of the second resistance R2, and second end of the first electric capacity C1 is connected with second end of the second resistance R2; The first end of the 3rd resistance R3 is connected with the first end of the second resistance R2, and second end of the 3rd resistance R3 is connected with second end of the first electric capacity C1; The first end of diode D4 is connected with the first end of the first electric capacity C1, and second end of diode D4 is connected with second end of the first electric capacity C1.
Particularly, the second resistance R2, the first electric capacity C1, the 3rd resistance R3 and diode D4 constitute feedback module, wherein, are jointly coordinated the feedback voltage regulating feedback module to feed back to switching power source chip by the second resistance R2 and the 3rd resistance R3.
Alternatively, as shown in Figure 2, control circuit comprises inductance L 2, second electric capacity C2, sustained diode 5, wherein: the first end of inductance L 2 is connected with second end of the first electric capacity C1, and the second end of inductance L 2 is connected with second end of diode D4; The first end of the second electric capacity C2 is connected with second end of diode D4, and second end of the second electric capacity C2 is connected with the reversed-phase output of AC power; The first end of sustained diode 5 is connected with second end of the second resistance R2, and the second end of sustained diode 5 is connected with the reversed-phase output of AC power.
Particularly, inductance L 2 is power filter inductance; D5 stays diode for continuous; Second electric capacity C2 is the filter capacitor that feedback module feeds back to switching power source chip.As shown in Figure 2, control circuit also comprises the shunt capacitance C4 of switching power source chip, and this electric capacity C4 is connected to the BP pin of switching power source chip and the two ends of S pin.
According to the embodiment of the present invention, provide a kind of embodiment of the method for control method of Switching Power Supply, the control circuit of any one Switching Power Supply that the method can be provided by embodiment of the present invention foregoing carries out the control of Switching Power Supply, it should be noted that, can perform in the computer system of such as one group of computer executable instructions in the step shown in the flow chart of accompanying drawing, and, although show logical order in flow charts, but in some cases, can be different from the step shown or described by order execution herein.
Fig. 3 is the flow chart of the control method of a kind of Switching Power Supply according to the embodiment of the present invention, and as shown in Figure 3, the method comprises the steps that S102 is to step S108:
Step S102, the surging signal value in detection control circuit.
Particularly, in the moment that Switching Power Supply is opened or closed, switching overvoltage (or overcurrent) can be produced, this switching overvoltage (or Overcurrent) can be called surge voltage (or being called surge current), wherein, the value of surge voltage or the primary system of surge current are called surging signal value.In embodiments of the present invention, the rectifier diode composition protection module of multiple series connection, wherein, can regulate the quantity of rectifier diode according to the value of surge voltage (or value of surge current).
Step S104, compares the size of surging signal value and default surging signal value, and wherein, presetting surging signal value is the maximum that protection module allows the surging signal value passed through.
The surging signal value detected and default surging signal value are compared, such as, the value of the value of surge voltage and default surge voltage is compared, the value of the value of surge current and default surge current can also be compared.For judging whether surge voltage (or surge current) exceedes the maximum that protection module allows the surging signal value passed through, and then ensure the normal operation of the safety of control circuit.
Step S106, when comparing surging signal value and being greater than default surging signal value, increases rectifier diode quantity in protection module, wherein, and the different quantity difference presetting rectifier diode corresponding to surging signal value.
If compare surging signal value to be greater than default surging signal value, now, in order to ensure that surge voltage (or surge current) is normal through control circuit, then increase the quantity of rectifier diode in protection module, to increase default surging signal value.
If again, increase piezo-resistance in the control circuit of Switching Power Supply after, forward surge voltage (or surge forward current) can normal through control circuit.Such as; when forward surge voltage value is 3KV or 4KV; this surge voltage can be normal through; but reverse surge voltage 3KV or 4KV then can not normal through control circuit; now, can increase the quantity of rectifier diode in protection module, solving reverse surge voltage (or reverse surge current) can not normal through the problem of control circuit; wherein, the quantity of the rectifier diode of increase can be added according to actual conditions.
Step S108, regulate the size of the first output voltage of protection module, to make the first output voltage of inflow switching power source chip be less than predeterminated voltage, wherein, predeterminated voltage is the maximum withstand voltage of switching power source chip.
Particularly, after by the rectifier diode of protection module rectification process being carried out to AC power AC, the first output voltage is obtained.Wherein, before the first output voltage inputs to switching power source chip, adjustment module regulates the first output voltage, with the maximum withstand voltage making the first output voltage be less than switching power source chip, ensures the normal work of switching power source chip.Wherein, this withstand voltage is the value of predeterminated voltage.
In embodiments of the present invention, by regulating the quantity of rectifier diode in protection module, to increase the guard interval of surge protection, make reverse surge can normal through circuit; And adopt adjustment module to regulate with to the AC power flowing through protection module, to make the input voltage flowing into switching power source chip in safe range; The feedback voltage simultaneously receiving feedback module carrys out the output voltage of by-pass cock power supply, relative to reverse surge in prior art can not normal through problem, the present invention is by increasing multiple diode, reaching reverse surge can normal through the object of switching power source control circuit, and then solve the weak technical problem of switching power source control circuit Surge handling capability of the prior art, thus achieve the technique effect improving Surge handling capability by increasing rectifier diode quantity.
Alternatively; before the size of the first output voltage regulating protection module; the control method of Switching Power Supply provided by the invention also comprises step S1: carry out filtering to the first output voltage of protection module; particularly; after the rectifies of AC power AC in protection module; first output voltage need be carried out filtering process, and then using the input voltage of the first output voltage after filtering as switching power source chip.
Alternatively, step S108 regulates the size of the first output voltage of protection module to comprise the steps that S1081 is to step S1085:
Step S1081, judges whether the first output voltage of the protection module after process is after filtering more than or equal to predeterminated voltage.
Step S1083, when judging that the first output voltage is more than or equal to predeterminated voltage, the voltage stabilizing didoe in regulating and controlling module is connected serially between switching power source chip and protection module.
Step S1085, when judging that the first output voltage is less than predeterminated voltage, the first resistant series in regulating and controlling module is between switching power source chip and protection module.
Particularly, after first output voltage processes after filtering, if the first output voltage is higher than 0.8 times of withstand voltage of the built-in mos pipe of switching power source chip, then select series voltage stabilizing diode, to make voltage stabilizing didoe carry out dividing potential drop, and using the input voltage of the first output voltage after dividing potential drop as switching power source chip; If during the first output voltage mos pipe 0.8 times withstand voltage built-in lower than switching power source chip, voltage stabilizing didoe uses 0 Ω first resistance to replace, now, 0 Ω first resistance is by voltage stabilizing didoe short circuit, but dividing potential drop is not carried out to the first output voltage, thus ensure the magnitude of voltage of switching power source chip stable output.Wherein, the built-in mos pipe of switching power source chip 0.8 times of withstand voltage is the value of predeterminated voltage.
Alternatively, the control method of Switching Power Supply provided by the invention also comprises step S2: the feedback voltage receiving feedback module, with the second output voltage of by-pass cock power supply chip.According to the magnitude of voltage of feedback module feedback, carry out the second output voltage values of control switch power supply chip, with the normal operation making the second output voltage values of switching power source chip meet load.Wherein, load can be water dispenser, and the equipment of switching power source control circuit installed by humidifier and water heater etc.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
In the above embodiment of the present invention, the description of each embodiment is all emphasized particularly on different fields, in certain embodiment, there is no the part described in detail, can see the associated description of other embodiments.
In several embodiments that the application provides, should be understood that, disclosed technology contents, the mode by other realizes.Wherein, device embodiment described above is only schematic, the such as division of described unit, can be that a kind of logic function divides, actual can have other dividing mode when realizing, such as multiple unit or assembly can in conjunction with or another system can be integrated into, or some features can be ignored, or do not perform.Another point, shown or discussed coupling each other or direct-coupling or communication connection can be by some interfaces, and the indirect coupling of unit or module or communication connection can be electrical or other form.
The described unit illustrated as separating component or can may not be and physically separates, and the parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed on multiple unit.Some or all of unit wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, also can be that the independent physics of unit exists, also can two or more unit in a unit integrated.Above-mentioned integrated unit both can adopt the form of hardware to realize, and the form of SFU software functional unit also can be adopted to realize.
If described integrated unit using the form of SFU software functional unit realize and as independently production marketing or use time, can be stored in a computer read/write memory medium.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words or all or part of of this technical scheme can embody with the form of software product, this computer software product is stored in a storage medium, comprises all or part of step of some instructions in order to make a computer equipment (can be personal computer, server or the network equipment etc.) perform method described in each embodiment of the present invention.And aforesaid storage medium comprises: USB flash disk, read-only memory (ROM, Read-OnlyMemory), random access memory (RAM, RandomAccessMemory), portable hard drive, magnetic disc or CD etc. various can be program code stored medium.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (11)
1. a control circuit for Switching Power Supply, is characterized in that, comprising:
Switching power source chip;
Protection module, for carrying out surge protection to described control circuit, regulate the guard interval of surge protection, wherein, described protection module comprises the rectifier diode of multiple series connection, and the quantity of the described rectifier diode that different described guard interval is corresponding is different; And
Adjustment module; described adjustment module is connected with described switching power source chip with described protection module respectively; for regulating the size of the input voltage of described switching power source chip, wherein, described input voltage is the first output voltage that AC power flows through after described protection module.
2. control circuit according to claim 1, is characterized in that, described adjustment module comprises:
First resistance, the first end of described first resistance is connected with the forward output of described AC power, and the second end of described first resistance is connected with the drain electrode end of described switching power source chip, and wherein, the resistance of described first resistance is 0 Ω; And
Voltage stabilizing didoe, described voltage stabilizing didoe is connected with the first end of described first resistance, and the second end of described voltage stabilizing didoe is connected with the second end of described first resistance.
3. control circuit according to claim 1, is characterized in that, described control circuit also comprises:
Feedback module, described feedback module is connected with described switching power source chip, for regulating the second output voltage of described switching power source chip.
4. control circuit according to claim 3, is characterized in that, described feedback module comprises:
Second resistance, the first end of described second resistance is connected with the feedback input end of described switching power source chip, and the second end of described second resistance is connected with the source electrode of described switching power source chip;
First electric capacity, the first end of described first electric capacity is connected with the first end of described second resistance, and the second end of described first electric capacity is connected with the second end of described second resistance;
3rd resistance, the first end of described 3rd resistance is connected with the first end of described second resistance, and the second end of described 3rd resistance is connected with the second end of described first electric capacity; And
Diode, the first end of described diode is connected with the first end of described first electric capacity, and the second end of described diode is connected with the second end of described first electric capacity.
5. control circuit according to claim 4, is characterized in that, described control circuit also comprises:
Inductance, the first end of described inductance is connected with the second end of described first electric capacity, and the second end of described inductance is connected with the second end of described diode;
Second electric capacity, the first end of described second electric capacity is connected with the second end of described diode, and the second end of described second electric capacity is connected with the reversed-phase output of described AC power; And
Fly-wheel diode, the first end of described fly-wheel diode is connected with the second end of described second resistance, and the second end of described fly-wheel diode is connected with the reversed-phase output of described AC power.
6. control circuit according to claim 1, is characterized in that, described control circuit also comprises:
Filtration module; described filtration module is connected with described adjustment module with described protection module respectively; for carrying out filtering to the first output voltage of described protection module, with the size making described adjustment module regulate described first output voltage after process after filtering.
7. control circuit according to claim 1, is characterized in that, described control circuit also comprises:
Piezo-resistance, described piezo-resistance is connected to the two ends of described AC power.
8. a control method for Switching Power Supply, is characterized in that, carried out the control of Switching Power Supply by the control circuit of the Switching Power Supply according to any one of claim 1 to 7, described method comprises:
Detect the surging signal value in described control circuit;
The size of more described surging signal value and default surging signal value, wherein, described default surging signal value is the maximum that the protection module of described control circuit allows the described surging signal value passed through;
When comparing described surging signal value and being greater than described default surging signal value, increase rectifier diode quantity in the protection module of described control circuit, wherein, the quantity of the described rectifier diode that different described default surging signal value is corresponding is different; And
Regulate the size of the first output voltage of described protection module, to make described first output voltage of the described switching power source chip of inflow be less than predeterminated voltage, wherein, described predeterminated voltage is the maximum withstand voltage of described switching power source chip.
9. control method according to claim 8, is characterized in that, before the size of the first output voltage regulating described protection module, described method comprises:
Filtering is carried out to the first output voltage of described protection module.
10. control method according to claim 9, is characterized in that, regulates the size of the first output voltage of described protection module to comprise:
Judge whether the first output voltage of the described protection module after process is after filtering more than or equal to described predeterminated voltage;
When judging that described first output voltage is more than or equal to described predeterminated voltage, the described voltage stabilizing didoe controlled in the adjustment module of described control circuit is connected serially between described switching power source chip and described protection module; And
When judging that described first output voltage is less than described predeterminated voltage, control described first resistant series in described adjustment module between described switching power source chip and described protection module.
11. control methods according to claim 8, is characterized in that, described method comprises:
Receive the feedback voltage of the feedback module of described control circuit, to regulate the second output voltage of the switching power source chip of described control circuit.
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| CN105141117B (en) | 2018-11-06 |
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