CN212726879U - Control circuit of switching power supply device and switching power supply device - Google Patents
Control circuit of switching power supply device and switching power supply device Download PDFInfo
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- CN212726879U CN212726879U CN202021687663.2U CN202021687663U CN212726879U CN 212726879 U CN212726879 U CN 212726879U CN 202021687663 U CN202021687663 U CN 202021687663U CN 212726879 U CN212726879 U CN 212726879U
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Abstract
The utility model provides a switching power supply unit's control circuit and switching power supply unit, this control circuit includes: the device comprises an alternating current filter rectifying circuit, a direct current filter circuit, a switch control circuit, a transformer, a secondary rectifier filter circuit and a comparison circuit; the direct current filter circuit comprises two polar capacitors connected in series and having a voltage of 400V/470 uF; the switch control circuit comprises a control chip U100, wherein a power switch and a sampling resistor are integrated in the control chip U100; the alternating current filter rectification circuit is connected with an alternating current commercial power, the alternating current filter rectification circuit is connected with two polar capacitors in parallel, first ends of the two polar capacitors are connected with a first end of the primary winding, second ends of the two polar capacitors are grounded, the first ends of the two polar capacitors are used for being connected with a load, and a second end of the primary winding is connected with a drain electrode D of a power switch in the control chip U100. The utility model discloses a stable output of control power supply can be guaranteed to the scheme, has the power switch of more excellent configuration in aspects such as production efficiency, cost and space simultaneously.
Description
Technical Field
The utility model relates to a switching power supply technical field, in particular to switching power supply unit's control circuit and switching power supply unit.
Background
At present, a plurality of switching power supply design circuits are used, requirements of various fields are different, and design schemes and power sizes of power supply designs are different. Most power switches employ discrete MOS and PWM controller schemes, which are costly, have a high component count, take up significant board space, are heavy, and have low efficiency, poor productivity and system reliability.
Moreover, the current switch power supply design (such as a refrigerator integrated board) can only meet the requirement that the input alternating current is within 320V, but the refrigerator is already popularized among common people in various regions around the world, and for some remote regions and national power supplies with poor power grid environment even fluctuate to more than 450VAC, the failure rate of the conventional design power supply is increased remarkably (the capacitor is broken, the control MOS is broken down, and the like).
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a switching power supply unit's control circuit and switching power supply unit can guarantee control power supply's stable output, have the control chip U100 of more excellent configuration in aspects such as production efficiency, consumption, cost and space simultaneously.
In a first aspect, an embodiment of the present invention provides a control circuit of a switching power supply device, including: the circuit comprises an alternating current filter rectifying circuit, a direct current filter circuit, an absorption circuit, a switch control circuit, a transformer T100, a secondary rectifier filter circuit and a comparison circuit;
the direct current filter circuit comprises two polar capacitors connected in series and having 400V/470 uF;
the switch control circuit comprises a control chip U100, and a power switch and a sampling resistor are integrated in the control chip U100;
the transformer T100 includes a primary winding, a secondary winding, and an auxiliary winding, wherein a current flows from the primary winding to the secondary winding, and a current of the secondary winding flows to the auxiliary winding;
the alternating current filter rectification circuit is connected with an alternating current commercial power, the alternating current filter rectification circuit is connected with the two polar capacitors in parallel, the first ends of the two polar capacitors are connected with the first end of the primary winding, the second ends of the two polar capacitors are grounded, the first ends of the two polar capacitors are used for being connected with a load, and the second end of the primary winding is connected with the drain electrode D of the power switch in the control chip U100;
the absorption circuit is connected with the primary winding in parallel, a first end of the absorption circuit is connected with first ends of the two polar capacitors, and a second end of the absorption circuit is connected with a drain electrode D of the power switch;
the power switch is used for controlling the power-on and power-off of the primary winding, a VCC terminal of the control chip U100 is connected with the secondary winding through the auxiliary winding, and the secondary winding is connected with the secondary rectifying and filtering circuit;
the comparison circuit is used for comparing a reference voltage with the output voltage of the secondary winding and outputting a comparison signal to the FB terminal of the control chip U100, so that the control chip U100 controls the power switch to be switched on or switched off according to the comparison signal; wherein the reference voltage is an output voltage of the comparison circuit.
In one possible design, the ac filter rectifier circuit includes: fuse FU100, piezoresistor RV100, capacitor C100, inductor L100 and full-bridge rectifier BR 100;
the first end of the fuse FU100 is connected with a live wire of the alternating current mains supply, and the second end of the fuse FU100 is connected with the first end of the voltage dependent resistor RV100, the first end of the capacitor C100 and the first end of the inductor L100;
the second end of the piezoresistor RV100, the second end of the capacitor C100 and the second end of the inductor L100 are connected with a zero line of the alternating current commercial power;
a first end of the inductor L100 is connected to a first end of the full-bridge rectifier BR100, and a second end of the inductor L100 is connected to a second end of the full-bridge rectifier BR 100;
the third end of full-bridge rectifier module BR100 is connected with two there is polarity electric capacity's first end, full-bridge rectifier module BR 100's fourth end and two there is polarity electric capacity's second end all ground connection.
In one possible design, the absorption circuit includes: a resistor R100, a resistor R102, a diode D100 and a capacitor C103;
a first end of the resistor R100 and a first end of the capacitor C103 are respectively connected to first ends of the two polar capacitors and a first end of the primary winding;
a first end of the resistor R100 and a first end of the capacitor C103 are respectively connected to a negative electrode of the diode D100;
the anode of the diode D100 is connected to a first end of the resistor R102;
a second terminal of the resistor R102 is connected to the drain D of the power switch.
In one possible design, further comprising: an auxiliary rectification filter circuit;
the auxiliary rectification filter circuit comprises: a capacitor C104, a resistor R101, a diode D101, a resistor R103 and a diode D102;
a first end of the capacitor C104 is connected to a first end of the auxiliary winding, and a second end of the capacitor C104 is connected to a second end of the auxiliary winding;
a first end of the resistor R101 is connected to a first end of the capacitor C104, and a second end of the resistor R101 is connected to an anode of the diode D101;
the cathode of the diode D101 is connected to the first end of the resistor R103, the second end of the resistor R103 is connected to the anode of the diode D102, and the cathode of the diode D102 is connected to the VCC terminal of the control chip U100;
the cathode of the diode D101 is used for connecting with an external driving component.
In one possible design, the switch control circuit further includes: the photoelectric coupler U101A, a capacitor C109, a capacitor C108, a resistor R104, a capacitor C107 and a capacitor C106;
a first end of the photoelectric coupler U101A is respectively connected with a first end of the capacitor C109 and a COMP terminal of the control chip U100, and a second end of the photoelectric coupler U101A is grounded;
a first end of the capacitor C109 is connected with the COMP terminal of the control chip U100, and a second end of the capacitor C109 is grounded;
a first end of the capacitor C109 is connected with a LINE terminal of the control chip U100, and a second end of the capacitor C108 is grounded;
a first end of the resistor R104 is connected with a LINE terminal of the control chip U100, and a second end of the resistor R104 is grounded;
a first end of the capacitor C107 is connected to a VCC terminal of the control chip U100, and a second end of the capacitor C107 is grounded;
the first end of the capacitor C106 is connected to the VCC terminal of the control chip U100, and the second end of the capacitor C106 is grounded.
In one possible design, the secondary rectifying and filtering circuit includes: the circuit comprises a diode D200, a capacitor C200, a resistor R200 and a capacitor C201;
the anode of the diode D200 is connected to the first end of the secondary winding, and the cathode of the diode D200 is connected to the second end of the resistor R200, the first end of the capacitor C201, and the first end of the comparator circuit, respectively;
a first end of the capacitor C200 is connected to the anode of the diode D200 and a first end of the secondary winding, respectively, and a first end of the capacitor C200 is connected to a first end of the resistor R200;
the second end of the secondary winding, the second end of the capacitor C201 and the second end of the comparison circuit are all grounded.
In one possible design, the comparison circuit includes: the circuit comprises an inductor L200, a resistor R201, a resistor R202, a resistor R203, a resistor R204, a resistor R205, a capacitor C202, a capacitor C203, a capacitor C204, a photoelectric coupler U101B and a voltage stabilizing diode DZ 200;
a first end of the inductor L200 and a first end of the resistor R201 are respectively connected to a first end of the capacitor C201, a second end of the inductor L200 is respectively connected to a first end of the resistor R203, a first end of the capacitor C203, and a first end of the capacitor C204, and the first end of the capacitor C204 is used for being connected to an external main control component;
a second end of the resistor R201 is connected to a first end of the photocoupler U101B and a first end of the resistor R202, respectively, and a second end of the photocoupler U101B and a second end of the resistor R202 are connected to a first end of the resistor R204 and a negative electrode of the zener diode DZ200, respectively;
a second end of the resistor R204 is connected to a first end of the capacitor C202, and second ends of the capacitor C202 are respectively connected to a second end of the resistor R203 and a first end of the resistor R205;
the second terminal of the resistor R205 is grounded.
In a second aspect, embodiments of the present invention provide a switching power supply device, including a control circuit of the switching power supply device as described above.
According to the above technical scheme, the control circuit of the switching power supply device and the switching power supply device provided by the utility model ensure the stable output of the control power supply by enabling the direct current filter circuit to comprise two 400V/470uF polar capacitors connected in series; by enabling the switch control circuit to include the control chip U100, a power switch and a sampling resistor are integrated inside the control chip U100, so as to achieve a better configuration of the control chip U100 in terms of production efficiency, power consumption, cost, space and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a circuit diagram of a control circuit of a switching power supply device according to an embodiment of the present invention.
Detailed Description
In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the following will combine the drawings in the embodiments of the present invention to clearly and completely describe the technical solution in the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, rather than all embodiments, based on the embodiments in the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the scope of the present invention.
Fig. 1 is a circuit diagram of a control circuit of a switching power supply device according to an embodiment of the present invention. As shown in fig. 1, the control circuit of the switching power supply device includes: the circuit comprises an alternating current filter rectifying circuit, a direct current filter circuit, an absorption circuit, a switch control circuit, a transformer T100, a secondary rectifier filter circuit and a comparison circuit;
the direct current filter circuit comprises two polar capacitors connected in series and having 400V/470 uF;
the switch control circuit comprises a control chip U100, and a power switch and a sampling resistor are integrated in the control chip U100;
the transformer T100 includes a primary winding, a secondary winding, and an auxiliary winding, wherein a current flows from the primary winding to the secondary winding, and a current of the secondary winding flows to the auxiliary winding;
the alternating current filter rectification circuit is connected with an alternating current commercial power, the alternating current filter rectification circuit is connected with the two polar capacitors in parallel, the first ends of the two polar capacitors are connected with the first end of the primary winding, the second ends of the two polar capacitors are grounded, the first ends of the two polar capacitors are used for being connected with a load, and the second end of the primary winding is connected with the drain electrode D of the power switch in the control chip U100;
the absorption circuit is connected with the primary winding in parallel, a first end of the absorption circuit is connected with first ends of the two polar capacitors, and a second end of the absorption circuit is connected with a drain electrode D of the power switch;
the power switch is used for controlling the power-on and power-off of the primary winding, a VCC terminal of the control chip U100 is connected with the secondary winding through the auxiliary winding, and the secondary winding is connected with the secondary rectifying and filtering circuit;
the comparison circuit is used for comparing a reference voltage with the output voltage of the secondary winding and outputting a comparison signal to the FB terminal of the control chip U100, so that the control chip U100 controls the power switch to be switched on or switched off according to the comparison signal; wherein the reference voltage is an output voltage of the comparison circuit.
In the embodiment of the utility model, the stable output of the control power supply is ensured by making the direct current filter circuit comprise two 400V/470uF polar capacitors connected in series, thereby providing guarantee for the stable and reliable operation of the refrigerator in the severe power utilization environment; by enabling the switch control circuit to include the control chip U100, a power switch and a sampling resistor are integrated inside the control chip U100, so as to achieve a better configuration of the control chip U100 in terms of production efficiency, power consumption, cost, space and the like.
Specifically, the ac is rectified to be a pulsating dc, and the first terminals of the two polar capacitors (i.e., C101 and C102) are the load power supplied to the motor, so that a large capacitor of hundreds of microfarads needs to be connected after the rectification, and the pulsating voltage becomes a relatively stable dc voltage. The Vp voltage can be as high as 700V, and the capacitor with the voltage exceeding 500V is not only large and expensive, but also difficult to buy in the market and basically needs to be customized. The scheme adopts a mode of serially connecting two (C101 and C102)400V/470uF voltage-resistant capacitors, the voltage resistance can reach 800V, the power supply ripple is small, and compared with the common scheme, the problem is solved by only increasing little cost.
Specifically, the control chip U100 is an integrated peak current mode control Pulse Width Modulation (PWM) power switch, and is specifically designed for an off-line high voltage tolerant (e.g., 800V) switch mode power supply. The PWM controller comprises a soft start, frequency hopping, optimized gate driver (not shown in the figure), an internal transconductance amplifier (not shown in the figure), temperature compensation precision current source loop compensation and enhanced self-protection characteristics. The control chip U100 may reduce overall cost, component count, size, and weight while improving efficiency, productivity, and system reliability as compared to discrete MOS and PWM controller schemes.
In an embodiment of the present invention, the ac filter and rectifier circuit includes: fuse FU100, piezoresistor RV100, capacitor C100, inductor L100 and full-bridge rectifier BR 100;
the first end of the fuse FU100 is connected with a live wire of the alternating current mains supply, and the second end of the fuse FU100 is connected with the first end of the voltage dependent resistor RV100, the first end of the capacitor C100 and the first end of the inductor L100;
the second end of the piezoresistor RV100, the second end of the capacitor C100 and the second end of the inductor L100 are connected with a zero line of the alternating current commercial power;
a first end of the inductor L100 is connected to a first end of the full-bridge rectifier BR100, and a second end of the inductor L100 is connected to a second end of the full-bridge rectifier BR 100;
the third end of full-bridge rectifier module BR100 is connected with two there is polarity electric capacity's first end, full-bridge rectifier module BR 100's fourth end and two there is polarity electric capacity's second end all ground connection.
The embodiment of the utility model provides an in, external interchange commercial power comes in the back, at first through exchanging filter rectifier circuit, and fuse FU100 can absorb the surge as the current-limiting protection component of circuit, and piezo-resistor RV100 is as the voltage limiting protection component of circuit. The full-bridge rectifier module BR100 is composed of four rectifier diodes, and is configured to convert ac power to dc power. The rectified direct current is filtered by a capacitor C100, then filtered by an inductor L100, and filtered by two polar capacitors C101 and C102.
In an embodiment of the present invention, the absorption circuit includes: a resistor R100, a resistor R102, a diode D100 and a capacitor C103;
a first end of the resistor R100 and a first end of the capacitor C103 are respectively connected to first ends of the two polar capacitors and a first end of the primary winding;
a first end of the resistor R100 and a first end of the capacitor C103 are respectively connected to a negative electrode of the diode D100;
the anode of the diode D100 is connected to a first end of the resistor R102;
a second terminal of the resistor R102 is connected to the drain D of the power switch.
In the embodiment of the utility model provides an in, the absorption circuit can restrain the destruction of instantaneous overvoltage and overcurrent to power electronics electrical apparatus, also can reduce power electronics electrical apparatus's switching loss. The main object of the absorption circuit protection in the present technical solution is the transformer T100.
In an embodiment of the present invention, the method further comprises: an auxiliary rectification filter circuit;
the auxiliary rectification filter circuit comprises: a capacitor C104, a resistor R101, a diode D101, a resistor R103 and a diode D102;
a first end of the capacitor C104 is connected to a first end of the auxiliary winding, and a second end of the capacitor C104 is connected to a second end of the auxiliary winding;
a first end of the resistor R101 is connected to a first end of the capacitor C104, and a second end of the resistor R101 is connected to an anode of the diode D101;
the cathode of the diode D101 is connected to the first end of the resistor R103, the second end of the resistor R103 is connected to the anode of the diode D102, and the cathode of the diode D102 is connected to the VCC terminal of the control chip U100;
the cathode of the diode D101 is used for connecting with an external driving component.
The embodiment of the utility model provides an in, supplementary winding passes through electric capacity C104, resistance R101, diode D101, resistance R103 and diode D102's rectification filter postgrafting control chip goes into U100's VCC terminal for its internal integrated circuit power supply, detect through this VCC terminal simultaneously and carry out overvoltage protection and self-resuming function.
In an embodiment of the present invention, the switch control circuit further includes: the photoelectric coupler U101A, a capacitor C109, a capacitor C108, a resistor R104, a capacitor C107 and a capacitor C106;
a first end of the photoelectric coupler U101A is respectively connected with a first end of the capacitor C109 and a COMP terminal of the control chip U100, and a second end of the photoelectric coupler U101A is grounded;
a first end of the capacitor C109 is connected with the COMP terminal of the control chip U100, and a second end of the capacitor C109 is grounded;
a first end of the capacitor C109 is connected with a LINE terminal of the control chip U100, and a second end of the capacitor C108 is grounded;
a first end of the resistor R104 is connected with a LINE terminal of the control chip U100, and a second end of the resistor R104 is grounded;
a first end of the capacitor C107 is connected to a VCC terminal of the control chip U100, and a second end of the capacitor C107 is grounded;
the first end of the capacitor C106 is connected to the VCC terminal of the control chip U100, and the second end of the capacitor C106 is grounded.
The embodiment of the utility model provides an in control chip U100's inside is from taking power switch, so reduced electron device's quantity, also reduced corresponding other electron devices, practiced thrift the cost. Meanwhile, the power consumption of the power switch is also reduced by the control chip U100 through the built-in power switch, and when the control chip U100 is started by alternating current, the power of the circuit is smaller when the circuit is in no-load.
In an embodiment of the present invention, the secondary rectifying and filtering circuit includes: the circuit comprises a diode D200, a capacitor C200, a resistor R200 and a capacitor C201;
the anode of the diode D200 is connected to the first end of the secondary winding, and the cathode of the diode D200 is connected to the second end of the resistor R200, the first end of the capacitor C201, and the first end of the comparator circuit, respectively;
a first end of the capacitor C200 is connected to the anode of the diode D200 and a first end of the secondary winding, respectively, and a first end of the capacitor C200 is connected to a first end of the resistor R200;
the second end of the secondary winding, the second end of the capacitor C201 and the second end of the comparison circuit are all grounded.
The embodiment of the utility model provides an in, secondary winding adjusts the change that self electric current satisfies load (be Vp) electric current through diode DZ200 among the secondary rectification filter circuit to change with resistance R202 cooperation with the electric current converts the change of voltage into, with the change of adaptation input power, the voltage change at resistance R202 both ends makes photoelectric coupler U101B's LED take place to switch on and turn-off, and photoelectric coupler U101A is connected with control chip U100's COMP terminal simultaneously, with the duty cycle of the level height control PWM ripples through this COMP terminal.
In an embodiment of the present invention, the comparison circuit includes: the circuit comprises an inductor L200, a resistor R201, a resistor R202, a resistor R203, a resistor R204, a resistor R205, a capacitor C202, a capacitor C203, a capacitor C204, a photoelectric coupler U101B and a voltage stabilizing diode DZ 200;
a first end of the inductor L200 and a first end of the resistor R201 are respectively connected to a first end of the capacitor C201, a second end of the inductor L200 is respectively connected to a first end of the resistor R203, a first end of the capacitor C203, and a first end of the capacitor C204, and the first end of the capacitor C204 is used for being connected to an external main control component;
a second end of the resistor R201 is connected to a first end of the photocoupler U101B and a first end of the resistor R202, respectively, and a second end of the photocoupler U101B and a second end of the resistor R202 are connected to a first end of the resistor R204 and a negative electrode of the zener diode DZ200, respectively;
a second end of the resistor R204 is connected to a first end of the capacitor C202, and second ends of the capacitor C202 are respectively connected to a second end of the resistor R203 and a first end of the resistor R205;
the second terminal of the resistor R205 is grounded.
In the embodiment of the present invention, by providing the capacitor C105 between the auxiliary winding and the secondary winding, and grounding the LINE terminal of the control chip U100 through the capacitor C108 and the resistor R104, the voltage can be operated in a wider range, and the anti-interference capability thereof is enhanced. When the resistance of the resistor R104 is controlled so that the power consumption thereof is lower than 0.6W, the static power consumption and the dynamic power consumption of the control circuit can be greatly reduced. In addition, whether the control chip U100 works in the intermittent mode or the continuous mode can be changed by adjusting the resistance value of the resistor R201, and the scheme can change whether the control chip U100 works in the intermittent mode or the continuous mode by adjusting the resistance value of the resistor R201, so that the conversion efficiency reaches over 88%.
It can be understood that the scheme realizes that the withstand voltage capability of the electronic equipment reaches 800V by utilizing the series connection of the two polar capacitors (C101 and C102), realizes the conversion of the input of the AC70-500V ultra-wide range through the control circuit, and realizes the output of high-efficiency stable and reliable voltage for providing power supplies for the driving assembly and the main control assembly of the electronic equipment (such as a refrigerator). The control circuit is not only suitable for controlling the power supply of the alternating current input power supply refrigerator, but also suitable for controlling the power supply of other alternating current input power supply refrigerators.
Furthermore, the embodiment of the utility model provides a switching power supply unit is still provided, and this switching power supply unit includes the above-mentioned control circuit. It can be known that the switching power supply device has the same beneficial effects as the control circuit, and the detailed description is omitted here.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other similar elements in a process, method, article, or apparatus that comprises the element.
Finally, it is to be noted that: the above description is only the preferred embodiment of the present invention, which is only used to illustrate the technical solution of the present invention, and is not used to limit the protection scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention is included in the protection scope of the present invention.
Claims (8)
1. A control circuit for a switching power supply device, comprising: the circuit comprises an alternating current filter rectifying circuit, a direct current filter circuit, an absorption circuit, a switch control circuit, a transformer T100, a secondary rectifier filter circuit and a comparison circuit;
the direct current filter circuit comprises two polar capacitors connected in series and having 400V/470 uF;
the switch control circuit comprises a control chip U100, and a power switch and a sampling resistor are integrated in the control chip U100;
the transformer T100 includes a primary winding, a secondary winding, and an auxiliary winding, wherein a current flows from the primary winding to the secondary winding, and a current of the secondary winding flows to the auxiliary winding;
the alternating current filter rectification circuit is connected with an alternating current commercial power, the alternating current filter rectification circuit is connected with the two polar capacitors in parallel, the first ends of the two polar capacitors are connected with the first end of the primary winding, the second ends of the two polar capacitors are grounded, the first ends of the two polar capacitors are used for being connected with a load, and the second end of the primary winding is connected with the drain electrode D of the power switch in the control chip U100;
the absorption circuit is connected with the primary winding in parallel, a first end of the absorption circuit is connected with first ends of the two polar capacitors, and a second end of the absorption circuit is connected with a drain electrode D of the power switch;
the power switch is used for controlling the power-on and power-off of the primary winding, a VCC terminal of the control chip U100 is connected with the secondary winding through the auxiliary winding, and the secondary winding is connected with the secondary rectifying and filtering circuit;
the comparison circuit is used for comparing a reference voltage with the output voltage of the secondary winding and outputting a comparison signal to the FB terminal of the control chip U100, so that the control chip U100 controls the power switch to be switched on or switched off according to the comparison signal; wherein the reference voltage is an output voltage of the comparison circuit.
2. The control circuit of the switching power supply device according to claim 1, wherein the ac filter rectification circuit includes: fuse FU100, piezoresistor RV100, capacitor C100, inductor L100 and full-bridge rectifier BR 100;
the first end of the fuse FU100 is connected with a live wire of the alternating current mains supply, and the second end of the fuse FU100 is connected with the first end of the voltage dependent resistor RV100, the first end of the capacitor C100 and the first end of the inductor L100;
the second end of the piezoresistor RV100, the second end of the capacitor C100 and the second end of the inductor L100 are connected with a zero line of the alternating current commercial power;
a first end of the inductor L100 is connected to a first end of the full-bridge rectifier BR100, and a second end of the inductor L100 is connected to a second end of the full-bridge rectifier BR 100;
the third end of full-bridge rectifier module BR100 is connected with two there is polarity electric capacity's first end, full-bridge rectifier module BR 100's fourth end and two there is polarity electric capacity's second end all ground connection.
3. The control circuit of the switching power supply device according to claim 1, wherein the absorption circuit includes: a resistor R100, a resistor R102, a diode D100 and a capacitor C103;
a first end of the resistor R100 and a first end of the capacitor C103 are respectively connected to first ends of the two polar capacitors and a first end of the primary winding;
a first end of the resistor R100 and a first end of the capacitor C103 are respectively connected to a negative electrode of the diode D100;
the anode of the diode D100 is connected to a first end of the resistor R102;
a second terminal of the resistor R102 is connected to the drain D of the power switch.
4. The control circuit of the switching power supply device according to claim 1, further comprising: an auxiliary rectification filter circuit;
the auxiliary rectification filter circuit comprises: a capacitor C104, a resistor R101, a diode D101, a resistor R103 and a diode D102;
a first end of the capacitor C104 is connected to a first end of the auxiliary winding, and a second end of the capacitor C104 is connected to a second end of the auxiliary winding;
a first end of the resistor R101 is connected to a first end of the capacitor C104, and a second end of the resistor R101 is connected to an anode of the diode D101;
the cathode of the diode D101 is connected to the first end of the resistor R103, the second end of the resistor R103 is connected to the anode of the diode D102, and the cathode of the diode D102 is connected to the VCC terminal of the control chip U100;
the cathode of the diode D101 is used for connecting with an external driving component.
5. The control circuit of the switching power supply device according to claim 1, wherein the switching control circuit further comprises: the photoelectric coupler U101A, a capacitor C109, a capacitor C108, a resistor R104, a capacitor C107 and a capacitor C106;
a first end of the photoelectric coupler U101A is respectively connected with a first end of the capacitor C109 and a COMP terminal of the control chip U100, and a second end of the photoelectric coupler U101A is grounded;
a first end of the capacitor C109 is connected with the COMP terminal of the control chip U100, and a second end of the capacitor C109 is grounded;
a first end of the capacitor C109 is connected with a LINE terminal of the control chip U100, and a second end of the capacitor C108 is grounded;
a first end of the resistor R104 is connected with a LINE terminal of the control chip U100, and a second end of the resistor R104 is grounded;
a first end of the capacitor C107 is connected to a VCC terminal of the control chip U100, and a second end of the capacitor C107 is grounded;
the first end of the capacitor C106 is connected to the VCC terminal of the control chip U100, and the second end of the capacitor C106 is grounded.
6. The control circuit of the switching power supply device according to claim 1, wherein the secondary rectifying and smoothing circuit includes: the circuit comprises a diode D200, a capacitor C200, a resistor R200 and a capacitor C201;
the anode of the diode D200 is connected to the first end of the secondary winding, and the cathode of the diode D200 is connected to the second end of the resistor R200, the first end of the capacitor C201, and the first end of the comparator circuit, respectively;
a first end of the capacitor C200 is connected to the anode of the diode D200 and a first end of the secondary winding, respectively, and a first end of the capacitor C200 is connected to a first end of the resistor R200;
the second end of the secondary winding, the second end of the capacitor C201 and the second end of the comparison circuit are all grounded.
7. The control circuit of the switching power supply device according to claim 6, wherein the comparison circuit includes: the circuit comprises an inductor L200, a resistor R201, a resistor R202, a resistor R203, a resistor R204, a resistor R205, a capacitor C202, a capacitor C203, a capacitor C204, a photoelectric coupler U101B and a voltage stabilizing diode DZ 200;
a first end of the inductor L200 and a first end of the resistor R201 are respectively connected to a first end of the capacitor C201, a second end of the inductor L200 is respectively connected to a first end of the resistor R203, a first end of the capacitor C203, and a first end of the capacitor C204, and the first end of the capacitor C204 is used for being connected to an external main control component;
a second end of the resistor R201 is connected to a first end of the photocoupler U101B and a first end of the resistor R202, respectively, and a second end of the photocoupler U101B and a second end of the resistor R202 are connected to a first end of the resistor R204 and a negative electrode of the zener diode DZ200, respectively;
a second end of the resistor R204 is connected to a first end of the capacitor C202, and second ends of the capacitor C202 are respectively connected to a second end of the resistor R203 and a first end of the resistor R205;
the second terminal of the resistor R205 is grounded.
8. Switching power supply unit, characterized in that it comprises a control circuit of a switching power supply unit according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021687663.2U CN212726879U (en) | 2020-08-13 | 2020-08-13 | Control circuit of switching power supply device and switching power supply device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021687663.2U CN212726879U (en) | 2020-08-13 | 2020-08-13 | Control circuit of switching power supply device and switching power supply device |
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| CN212726879U true CN212726879U (en) | 2021-03-16 |
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| CN202021687663.2U Active CN212726879U (en) | 2020-08-13 | 2020-08-13 | Control circuit of switching power supply device and switching power supply device |
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