CN214101187U - Flyback switching power supply without electrolytic capacitor and electronic equipment - Google Patents
Flyback switching power supply without electrolytic capacitor and electronic equipment Download PDFInfo
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- CN214101187U CN214101187U CN202022751971.3U CN202022751971U CN214101187U CN 214101187 U CN214101187 U CN 214101187U CN 202022751971 U CN202022751971 U CN 202022751971U CN 214101187 U CN214101187 U CN 214101187U
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Abstract
The utility model relates to a flyback switching power supply and electronic equipment of no electrolytic capacitor, flyback switching power supply includes transient filter circuit, a rectifier circuit, the RCD circuit, switching power supply circuit, feedback circuit and output rectifier circuit, rectifier circuit has four rectifier diodes VD1 ~ VD4, a serial communication port, rectifier circuit still is equipped with non-electrolytic capacitor C10, rectifier diode VD 1's negative pole and rectifier diode VD 2's negative pole are connected respectively to non-electrolytic capacitor C10's first end, power earthing terminal PGND is connected to non-electrolytic capacitor C10's second end. A low-cost non-electrolytic capacitor C10 is used for replacing two high-voltage electrolytic capacitors and parallel resistors, so that the cost of the flyback switching power supply is reduced, and the layout space of switching power supply devices is saved. Because the non-electrolytic capacitor C10 does not have leakage current, a shunt divider resistor does not need to be additionally arranged, and the static power consumption of the flyback switching power supply is reduced.
Description
Technical Field
The utility model relates to a flyback switching power supply field especially relates to a flyback switching power supply and electronic equipment of no electrolytic capacitor.
Background
The existing flyback switching power supply has the advantages of being capable of efficiently providing multi-path direct current output and meeting requirements of multiple groups of output. Referring to fig. 1, a conventional flyback switching power supply includes a transient filter circuit, a rectifier circuit, an RCD circuit (also called RCD absorption circuit), a switching power supply circuit, a feedback circuit, and an output rectifier circuit. Wherein:
in the transient filter circuit, after a mains supply is connected to switching power supplies Lin and Nin, the mains supply firstly enters the transient filter circuit, the transient filter circuit consists of a piezoresistor RV1, a winding resistor R1, an I-shaped inductor L1 and an X capacitor C2, the piezoresistor RV1 is used for inhibiting peaks in mains supply transient, the X capacitor C2 and the I-shaped inductor L1 play a role in filtering differential mode interference, and the winding resistor R1 is used for increasing the impedance of a line so as to inhibit surge current generated during startup.
In the rectifying circuit, alternating voltage is rectified into high-voltage direct current through four rectifying diodes VD 1-VD 4, and the high-voltage electrolytic capacitor CE1 and the high-voltage electrolytic capacitor CE2 are mainly used for energy storage and filtering, so that the working state of the switching power supply is kept stable, and the current and the voltage at the output end are smoother.
In the RCD circuit, the RCD circuit is composed of a capacitor C1, a resistor R3 and a diode VD5, and the RCD circuit is used for absorbing leakage inductance peak voltage generated by transformer leakage inductance.
The switching power supply circuit comprises a core working part of the switching power supply circuit, wherein the core working part comprises a switching power supply chip N1, a transformer T1, a peripheral device diode VD7, a capacitor C5, a high-voltage electrolytic capacitor CE5, a capacitor C6, a capacitor C7, a resistor R10, a resistor R11, a resistor R7 and a resistor R8.
The feedback circuit mainly comprises an optocoupler E1, a voltage regulator tube VD8, a resistor R6 and a resistor R9, and is responsible for sampling an output voltage signal and feeding the sampled signal back to the switching power supply chip N1 to adjust the working state of the switching power supply chip N1.
The output rectifying circuit mainly comprises a rectifying diode VD6, a resistor R5, a capacitor CE3, a capacitor CE4, a capacitor C3 and a capacitor C4, and converts energy stored in the transformer into direct-current voltage to be output and supplied to a load for use.
However, the flyback switching power supply described above also has some disadvantages:
firstly, the high-voltage electrolytic capacitor CE1 and the high-voltage electrolytic capacitor CE2 with higher price are arranged at the rectification rear end of the flyback switching power supply, so that the economic cost of the whole flyback switching power supply scheme is increased;
secondly, by connecting a plurality of high-voltage electrolytic capacitors in series, although the voltage-resistant requirement of the flyback switching power supply can be met, an additional parallel resistor needs to be added for voltage division treatment, which brings difficulty to the layout of switching power supply devices;
moreover, due to the leakage current of the high-voltage electrolytic capacitor and the parallel voltage-dividing resistor, the additional static power consumption of the flyback switching power supply is increased.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the first technical problem that will solve provides a flyback switching power supply who does not have electrolytic capacitor to above-mentioned prior art.
The utility model aims to solve the second technical problem that an electronic equipment that uses has above-mentioned flyback switching power supply is provided.
The utility model provides a technical scheme that first technical problem adopted does: an electrolytic capacitor-less flyback switching power supply, comprising:
a transient filter circuit;
a rectifying circuit connected to the transient filter circuit,
the RCD circuit is connected with the rectifying circuit;
the switch power supply circuit is connected with the RCD circuit;
the feedback circuit is connected with the switching power supply circuit;
and an output rectification circuit;
the rectifying circuit is provided with a rectifying diode VD1, a rectifying diode VD2, a rectifying diode VD3 and a rectifying diode VD4, the anode of the rectifying diode VD1 is connected with the cathode of the rectifying diode VD3, the anode of the rectifying diode VD2 is connected with the cathode of the rectifying diode VD4, and the cathode of the rectifying diode VD1 and the cathode of the rectifying diode VD2 are respectively connected with the current input end of the RCD circuit; the anode of the rectifying diode VD3 and the anode of the rectifying diode VD4 are respectively connected with a power grounding end PGND;
the rectification circuit is characterized in that the rectification circuit is further provided with a non-electrolytic capacitor C10, the first end of the non-electrolytic capacitor C10 is connected with the negative electrode of the rectification diode VD1 and the negative electrode of the rectification diode VD2 respectively, and the second end of the non-electrolytic capacitor C10 is connected with a power grounding end PGND.
Optionally, in the flyback switching power supply without the electrolytic capacitor, the non-electrolytic capacitor C10 is a safety X capacitor or a safety Y capacitor or a ceramic chip capacitor.
In an improved manner, in the flyback switching power supply without the electrolytic capacitor, the transient filter circuit includes a resistor R1, an inductor L1, a capacitor C2 and a varistor RV1, a first end of the resistor R1 is connected to the Lin terminal and a first end of the varistor RV1, a second end of the resistor R1 is connected to the first end of the inductor L1, a second end of the inductor L1 is connected to the first end of the capacitor C2, and a second end of the capacitor C2 is connected to the Nin terminal and a second end of the varistor RV 1.
Further, in the flyback switching power supply without the electrolytic capacitor, the RCD circuit includes a resistor R3, a capacitor C1 and a diode VD5, a first end of the resistor R3 is connected to a cathode of a rectifying diode VD1, a cathode of a rectifying diode VD2 and a first end of a capacitor C1, a second end of the resistor R3 and a second end of the capacitor C1 are connected to a cathode of a diode VD5, and an anode of the diode VD5 is connected to the switching power supply circuit; the first end of the resistor R3 is the current input end of the RCD circuit.
Still further, in the flyback switching power supply without the electrolytic capacitor, the switching power supply circuit includes a switching power supply chip N1, a transformer T1, a diode VD7, a capacitor C5, a high-voltage electrolytic capacitor CE5, a capacitor C6, a capacitor C7, a resistor R10, a resistor R11, a resistor R7 and a resistor R8; wherein:
the switching power supply chip N1 is provided with a GND pin, a VCC pin, an FSET pin, a PRO pin, an FB pin, a D pin and an S pin;
the transformer T1 is connected with the anode of the diode VD5, the anode of the diode VD7 is connected with a power grounding terminal PGND, the cathode of the diode VD7 is respectively connected with the first end of the capacitor C5 and the first end of the high-voltage electrolytic capacitor CE5, and the second end of the capacitor C5 and the second end of the high-voltage electrolytic capacitor CE5 are respectively connected with the power grounding terminal PGND;
the first end of the capacitor C6 is connected with the FB pin of the switching power supply chip N1, the first end of the capacitor C7 is connected with the FSET pin of the switching power supply chip N1, the first end of the resistor R10 is connected with the FSET pin of the switching power supply chip N1, and the first end of the resistor R11 is connected with the PRO pin of the switching power supply chip N1; the capacitor C6, the capacitor C7, the resistor R10, the resistor R11 and the GND pin of the switch power supply chip N1 are respectively connected with a power grounding end PGND;
the pin D of the switching power supply chip N1 is connected with the anode of the diode VD5, the first end of the resistor R7 and the first end of the resistor R8 are respectively connected with the pin S of the switching power supply chip N1, and the second end of the resistor R7 and the second end of the resistor R8 are respectively connected with the power grounding terminal PGND.
Still further, in the flyback switching power supply without the electrolytic capacitor, the feedback circuit includes an optocoupler E1, a voltage regulator tube VD8, a resistor R6 and a resistor R9, a first end of the resistor R6 is connected to a first preset voltage terminal, a second end of the resistor R6 is connected to a first end of the resistor R9 and a first input end of the optocoupler E1, a second end of the resistor R9 is connected to a second input end of the optocoupler E1 and a negative electrode of the voltage regulator tube VD8, and a positive electrode of the voltage regulator tube VD8 is connected to a ground terminal FGND.
Furthermore, in the flyback switching power supply without the electrolytic capacitor, the output rectifying circuit includes a rectifying diode VD6, a resistor R5, a capacitor CE3, a capacitor CE4, a capacitor C3 and a capacitor C4, an anode of the rectifying diode VD6 is connected to a first end of the capacitor C3, a second end of the capacitor C3 is connected to one end of the resistor R5, another end of the resistor R5 is connected to a cathode of the rectifying diode VD6, an anode of the capacitor CE3, an anode of the capacitor CE4, an anode of the capacitor C4 and a second preset voltage end, and a cathode of the capacitor CE3, a cathode of the capacitor CE4 and a cathode of the capacitor C4 are connected to a ground terminal FGND, respectively.
Preferably, in the flyback switching power supply without the electrolytic capacitor, the voltage values of the first preset voltage end and the second preset voltage end are the same.
Specifically, in this utility model, the voltage value of first predetermined voltage end and second predetermined voltage end is 16V.
The utility model provides a technical scheme that second technical problem adopted does: an electronic device is characterized in that any one of the flyback switching power supplies is applied.
Compared with the prior art, the utility model has the advantages of:
compared with the traditional flyback switching power supply, the flyback switching power supply adopts the condition that two high-voltage electrolytic capacitors (high-voltage electrolytic capacitor CE1 and high-voltage electrolytic capacitor CE2) with higher price and parallel resistance act together to realize the voltage division effect, the utility model provides a flyback switching power supply adopts non-electrolytic capacitor C10 has lower price, and only need a non-electrolytic capacitor C10 just can replace two high-voltage electrolytic capacitors and parallel resistance, make non-electrolytic capacitor C10 realize the voltage division effect alone, so not only reduced the economic cost of flyback switching power supply scheme, but also practiced thrift switching power supply device's overall arrangement space, layout space utilization has been improved.
In addition, since the non-electrolytic capacitor C10 has no leakage current and does not need to be additionally provided with a parallel voltage dividing resistor, the extra static power consumption of the flyback switching power supply can be reduced.
Drawings
Fig. 1 is a circuit diagram of a conventional flyback switching power supply;
fig. 2 is a circuit schematic diagram of the flyback switching power supply in this embodiment.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
As shown in fig. 2, the present embodiment provides a flyback switching power supply without an electrolytic capacitor, including:
a transient filter circuit;
a rectifying circuit connected to the transient filter circuit,
the RCD circuit is connected with the rectifying circuit;
the switch power supply circuit is connected with the RCD circuit;
the feedback circuit is connected with the switching power supply circuit;
and an output rectification circuit;
the rectifying circuit is provided with a rectifying diode VD1, a rectifying diode VD2, a rectifying diode VD3, a rectifying diode VD4 and a non-electrolytic capacitor C10, the anode of the rectifying diode VD1 is connected with the cathode of the rectifying diode VD3, the anode of the rectifying diode VD2 is connected with the cathode of the rectifying diode VD4, and the cathode of the rectifying diode VD1 and the cathode of the rectifying diode VD2 are respectively connected with the current input end of the RCD circuit; the anode of the rectifying diode VD3 and the anode of the rectifying diode VD4 are respectively connected with a power grounding end PGND; a first end of the non-electrolytic capacitor C10 is connected to a cathode of the rectifying diode VD1 and a cathode of the rectifying diode VD2, respectively, and a second end of the non-electrolytic capacitor C10 is connected to a power ground terminal PGND. Here, the non-electrolytic capacitor C10 may be a safety X capacitor, a safety Y capacitor, or a ceramic capacitor.
Referring again to fig. 2:
the transient filter circuit comprises a resistor R1, an inductor L1, a capacitor C2 and a piezoresistor RV1, wherein the first end of the resistor R1 is connected with the Lin end and the first end of the piezoresistor RV1 respectively, the second end of the resistor R1 is connected with the first end of the inductor L1, the second end of the inductor L1 is connected with the first end of the capacitor C2, and the second end of the capacitor C2 is connected with the Nin end and the second end of the piezoresistor RV1 respectively.
The RCD circuit comprises a resistor R3, a capacitor C1 and a diode VD5, wherein the first end of the resistor R3 is respectively connected with the cathode of a rectifier diode VD1, the cathode of a rectifier diode VD2 and the first end of a capacitor C1, the second end of the resistor R3 and the second end of the capacitor C1 are respectively connected with the cathode of a diode VD5, and the anode of the diode VD5 is connected with the switching power supply circuit; the first end of the resistor R3 is the current input end of the RCD circuit.
The switching power supply circuit comprises a switching power supply chip N1, a transformer T1, a diode VD7, a capacitor C5, a high-voltage electrolytic capacitor CE5, a capacitor C6, a capacitor C7, a resistor R10, a resistor R11, a resistor R7 and a resistor R8; wherein:
the switching power supply chip N1 is provided with a GND pin, a VCC pin, an FSET pin, a PRO pin, an FB pin, a D pin and an S pin;
the transformer T1 is connected with the anode of the diode VD5, the anode of the diode VD7 is connected with a power grounding terminal PGND, the cathode of the diode VD7 is respectively connected with the first end of the capacitor C5 and the first end of the high-voltage electrolytic capacitor CE5, and the second end of the capacitor C5 and the second end of the high-voltage electrolytic capacitor CE5 are respectively connected with the power grounding terminal PGND;
a first end of the capacitor C6 is connected with an FB pin of the switching power supply chip N1, a first end of the capacitor C7 is connected with an FSET pin of the switching power supply chip N1, a first end of the resistor R10 is connected with an FSET pin of the switching power supply chip N1, and a first end of the resistor R11 is connected with a PRO pin of the switching power supply chip N1; the capacitor C6, the capacitor C7, the resistor R10, the resistor R11 and the GND pin of the switch power supply chip N1 are respectively connected with a power grounding end PGND;
the pin D of the switching power supply chip N1 is connected with the positive electrode of the diode VD5, the first end of the resistor R7 and the first end of the resistor R8 are respectively connected with the pin S of the switching power supply chip N1, and the second end of the resistor R7 and the second end of the resistor R8 are respectively connected with the power grounding terminal PGND.
The feedback circuit comprises an optocoupler E1, a voltage regulator tube VD8, a resistor R6 and a resistor R9, wherein the first end of the resistor R6 is connected with a first preset voltage end, the second end of the resistor R6 is respectively connected with the first end of the resistor R9 and the first input end of the optocoupler E1, the second end of the resistor R9 is respectively connected with the second input end of the optocoupler E1 and the negative electrode of the voltage regulator tube VD8, and the positive electrode of the voltage regulator tube VD8 is connected with a grounding end FGND.
The output rectifying circuit comprises a rectifying diode VD6, a resistor R5, a capacitor CE3, a capacitor CE4, a capacitor C3 and a capacitor C4, wherein the positive electrode of the rectifying diode VD6 is connected with the first end of the capacitor C3, the second end of the capacitor C3 is connected with one end of a resistor R5, the other end of the resistor R5 is respectively connected with the negative electrode of the rectifying diode VD6, the positive electrode of the capacitor CE3, the positive electrode of the capacitor CE4, the positive electrode of the capacitor C4 and a second preset voltage end, and the negative electrode of the capacitor CE3, the negative electrode of the capacitor CE4 and the negative electrode of the capacitor C4 are respectively connected with a grounding terminal FGND. In this embodiment, the voltage values of the first preset voltage terminal and the second preset voltage terminal are the same, for example, the voltage values of the first preset voltage terminal and the second preset voltage terminal are both set to 16V.
The operation principle of the flyback switching power supply in this embodiment is described below with reference to fig. 2:
a rectification circuit of the flyback switching power supply converts 50Hz alternating current voltage input by mains supply into 100Hz alternating current voltage containing direct current components, and then a non-electrolytic capacitor C10 of the rectification circuit performs smoothing treatment on the 100Hz alternating current voltage to obtain direct current platform voltage;
the switching power supply works in a high-frequency state of about 50KHz, the supply period of front-end alternating-current energy is long and generally in a ms level, and the voltage of the direct-current platform cannot be reduced in a us level short time when the switching power supply normally works. Therefore, when the switching power supply is in light load operation, the capacitance value of the non-electrolytic capacitor C10 is enough to meet the power requirement. When the switching power supply works under heavy load, the voltage of the direct current platform filtered by the non-electrolytic capacitor C10 decreases along with the increase of the output power of the switching power supply, and the ripple voltage also increases. At the moment, the working state of the switching power supply is changed along with the change of the voltage of the direct current platform, the switching power supply gradually enters the working state of switching back and forth between the continuous mode and the discontinuous mode, simultaneously, the feedback voltage is gradually raised until the switching power supply enters an overload protection mechanism, the rectifying circuit can store energy through the non-electrolytic capacitor C10 in the delay process of the overload protection mechanism so as to pull up the voltage of the direct current platform again, and therefore the switching power supply is prevented from entering the overload protection mechanism within 10 ms.
The flyback switching power supply of the embodiment can realize light-load work of the switching power supply by using the non-electrolytic capacitor C10 with lower cost, and also realize heavy-load work of the power supply by using the overload protection delay mechanism of the switching power supply.
Compared with the traditional flyback switching power supply which adopts two high-voltage electrolytic capacitors (a high-voltage electrolytic capacitor CE1 and a high-voltage electrolytic capacitor CE2) with higher price and a parallel resistor to realize the voltage division effect, the non-electrolytic capacitor C10 adopted by the flyback switching power supply of the embodiment has lower price, and only one non-electrolytic capacitor C10 is needed to replace the two high-voltage electrolytic capacitors and the parallel resistor, so that the non-electrolytic capacitor C10 can independently realize the voltage division effect, the economic cost of the flyback switching power supply scheme is reduced, the layout space of switching power supply devices is saved, and the layout space utilization rate is improved. Of course, since there is no leakage current in the non-electrolytic capacitor C10, and there is no need to additionally provide a parallel voltage dividing resistor, the additional static power consumption of the flyback switching power supply can be reduced.
In addition, the embodiment also provides an electronic device, and the electronic device is applied with the flyback switching power supply.
Although the preferred embodiments of the present invention have been described in detail hereinabove, it should be clearly understood that modifications and variations of the present invention are possible to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An electrolytic capacitor-less flyback switching power supply, comprising:
a transient filter circuit;
a rectifying circuit connected to the transient filter circuit,
the RCD circuit is connected with the rectifying circuit;
the switch power supply circuit is connected with the RCD circuit;
the feedback circuit is connected with the switching power supply circuit;
and an output rectification circuit;
the rectifying circuit is provided with a rectifying diode VD1, a rectifying diode VD2, a rectifying diode VD3 and a rectifying diode VD4, the anode of the rectifying diode VD1 is connected with the cathode of the rectifying diode VD3, the anode of the rectifying diode VD2 is connected with the cathode of the rectifying diode VD4, and the cathode of the rectifying diode VD1 and the cathode of the rectifying diode VD2 are respectively connected with the current input end of the RCD circuit; the anode of the rectifying diode VD3 and the anode of the rectifying diode VD4 are respectively connected with a power grounding end PGND;
the rectification circuit is characterized in that the rectification circuit is further provided with a non-electrolytic capacitor C10, the first end of the non-electrolytic capacitor C10 is connected with the negative electrode of the rectification diode VD1 and the negative electrode of the rectification diode VD2 respectively, and the second end of the non-electrolytic capacitor C10 is connected with a power grounding end PGND.
2. The flyback switching power supply without an electrolytic capacitor of claim 1, wherein the non-electrolytic capacitor C10 is a regulated X capacitor or a regulated Y capacitor or a ceramic chip capacitor.
3. The flyback switching power supply without the electrolytic capacitor as claimed in claim 1 or 2, wherein the transient filter circuit comprises a resistor R1, an inductor L1, a capacitor C2 and a varistor RV1, a first terminal of the resistor R1 is connected to the Lin terminal and a first terminal of the varistor RV1 respectively, a second terminal of the resistor R1 is connected to a first terminal of the inductor L1, a second terminal of the inductor L1 is connected to a first terminal of the capacitor C2, and a second terminal of the capacitor C2 is connected to the Nin terminal and a second terminal of the varistor RV1 respectively.
4. The flyback switching power supply without the electrolytic capacitor as claimed in claim 3, wherein the RCD circuit comprises a resistor R3, a capacitor C1 and a diode VD5, a first end of the resistor R3 is connected to a cathode of a rectifying diode VD1, a cathode of a rectifying diode VD2 and a first end of a capacitor C1, respectively, a second end of the resistor R3 and a second end of the capacitor C1 are connected to a cathode of a diode VD5, respectively, and an anode of the diode VD5 is connected to the switching power supply circuit; the first end of the resistor R3 is the current input end of the RCD circuit.
5. The flyback switching power supply without the electrolytic capacitor as claimed in claim 4, wherein the switching power supply circuit comprises a switching power supply chip N1, a transformer T1, a diode VD7, a capacitor C5, a high-voltage electrolytic capacitor CE5, a capacitor C6, a capacitor C7, a resistor R10, a resistor R11, a resistor R7 and a resistor R8; wherein:
the switching power supply chip N1 is provided with a GND pin, a VCC pin, an FSET pin, a PRO pin, an FB pin, a D pin and an S pin;
the transformer T1 is connected with the anode of the diode VD5, the anode of the diode VD7 is connected with a power grounding terminal PGND, the cathode of the diode VD7 is respectively connected with the first end of the capacitor C5 and the first end of the high-voltage electrolytic capacitor CE5, and the second end of the capacitor C5 and the second end of the high-voltage electrolytic capacitor CE5 are respectively connected with the power grounding terminal PGND;
the first end of the capacitor C6 is connected with the FB pin of the switching power supply chip N1, the first end of the capacitor C7 is connected with the FSET pin of the switching power supply chip N1, the first end of the resistor R10 is connected with the FSET pin of the switching power supply chip N1, and the first end of the resistor R11 is connected with the PRO pin of the switching power supply chip N1; the capacitor C6, the capacitor C7, the resistor R10, the resistor R11 and the GND pin of the switch power supply chip N1 are respectively connected with a power grounding end PGND;
the pin D of the switching power supply chip N1 is connected with the anode of the diode VD5, the first end of the resistor R7 and the first end of the resistor R8 are respectively connected with the pin S of the switching power supply chip N1, and the second end of the resistor R7 and the second end of the resistor R8 are respectively connected with the power grounding terminal PGND.
6. The flyback switching power supply without the electrolytic capacitor as claimed in claim 5, wherein the feedback circuit comprises an optocoupler E1, a voltage regulator tube VD8, a resistor R6 and a resistor R9, a first end of the resistor R6 is connected to a first preset voltage terminal, a second end of the resistor R6 is connected to a first end of the resistor R9 and a first input end of the optocoupler tube E1, a second end of the resistor R9 is connected to a second input end of the optocoupler tube E1 and a negative electrode of the voltage regulator tube VD8, and a positive electrode of the voltage regulator tube VD8 is connected to a ground terminal FGND.
7. The flyback switching power supply without electrolytic capacitor as claimed in claim 6, wherein the output rectifying circuit comprises a rectifying diode VD6, a resistor R5, a capacitor CE3, a capacitor CE4, a capacitor C3 and a capacitor C4, wherein an anode of the rectifying diode VD6 is connected to a first end of the capacitor C3, a second end of the capacitor C3 is connected to one end of the resistor R5, another end of the resistor R5 is connected to a cathode of the rectifying diode VD6, an anode of the capacitor CE3, an anode of the capacitor CE4, an anode of the capacitor C4 and a second preset voltage end, and a cathode of the capacitor CE3, a cathode of the capacitor CE4 and a cathode of the capacitor C4 are connected to the ground terminal FGND, respectively.
8. The flyback switching power supply of claim 7, wherein the first predetermined voltage terminal and the second predetermined voltage terminal have the same voltage value.
9. The flyback switching power supply of claim 8, wherein the first predetermined voltage terminal and the second predetermined voltage terminal both have a voltage value of 16V.
10. An electronic device, characterized in that the flyback switching power supply according to any one of claims 1 to 9 is applied.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022751971.3U CN214101187U (en) | 2020-11-24 | 2020-11-24 | Flyback switching power supply without electrolytic capacitor and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022751971.3U CN214101187U (en) | 2020-11-24 | 2020-11-24 | Flyback switching power supply without electrolytic capacitor and electronic equipment |
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| CN214101187U true CN214101187U (en) | 2021-08-31 |
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| CN202022751971.3U Active CN214101187U (en) | 2020-11-24 | 2020-11-24 | Flyback switching power supply without electrolytic capacitor and electronic equipment |
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