CN221283049U - Switching power supply circuit, power supply device, charging system and electronic device - Google Patents
Switching power supply circuit, power supply device, charging system and electronic device Download PDFInfo
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- CN221283049U CN221283049U CN202323144846.6U CN202323144846U CN221283049U CN 221283049 U CN221283049 U CN 221283049U CN 202323144846 U CN202323144846 U CN 202323144846U CN 221283049 U CN221283049 U CN 221283049U
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Abstract
The utility model provides a switching power supply circuit, power supply equipment, a charging system and electronic equipment, wherein the output end of a primary circuit of the switching power supply circuit is coupled to a first end of a transformer, a second end of the transformer is respectively coupled to an anode of a first diode and a first end of an absorption capacitor, a cathode of the first diode is coupled to a first end of an output capacitor, a second end of the absorption capacitor is respectively coupled to a first end of a first resistor and a cathode of a second diode, both the second end of the first resistor and the anode of the second diode are coupled to the first end of the output capacitor, a third end of the transformer is coupled to the second end of the output capacitor, and the output capacitor is also connected in parallel with a load module; therefore, the peak voltage of the secondary side can be reduced when the circuit provided by the utility model works, and the power consumption of the circuit is lower; and when the circuit is in idle standby, the electric energy stored in the absorption capacitor is discharged to the output capacitor, so that the voltages at two ends of the absorption capacitor and the output capacitor are the same, and the power consumption of the circuit is zero.
Description
Technical Field
The present utility model relates to the field of power electronics, and in particular, to a switching power supply circuit, a power supply device, a charging system, and an electronic device.
Background
In recent years, the requirements for power consumption of the device in standby state are increasing, and in ideal state, the device should be in a zero power consumption state (i.e. the power consumption needs to be less than 5 mW), so improvement on the switching power supply circuit is needed.
In the current switching power supply circuit (taking an isolated flyback circuit as an example), if a switching tube on the primary side of a transformer is conducted, an induced voltage with higher change rate is induced at two ends of a secondary winding corresponding to the secondary side, and due to factors such as leakage inductance on the secondary side, a PCB routing inductance, parasitic capacitance at two ends of a rectifying tube and the like in the circuit, the induced voltage can oscillate in the secondary side circuit, so that higher peak voltage is generated at two ends of the rectifying tube. To avoid the impact of the spike voltage on the circuit, it is necessary to reduce the spike voltage with a snubber circuit.
In the current secondary spike voltage absorbing circuit, the resistor in the absorbing circuit is generally utilized to consume the electric energy stored in the capacitor, and the types of the secondary spike voltage absorbing circuit commonly used at present comprise an RC absorbing circuit and an RCD absorbing circuit.
Under the condition of higher circuit output voltage, the swing amplitude at two ends of a diode corresponding to the secondary side is larger, if an RC absorption circuit (shown in figure 1) is adopted to reduce peak voltage of the secondary side, the problem of serious heating is caused due to larger loss, and the problem of starting current oscillation of a switching tube at the primary side of the transformer is also caused;
If the RCD snubber circuit (as shown in fig. 2) is adopted, although the problem of larger RC loss is solved, the output capacitor in the secondary side circuit, the diode, the resistor, the capacitor and the secondary winding corresponding to the secondary side in the RCD snubber circuit form a continuous discharge loop, so that the problem of larger power consumption of the circuit during idle standby exists;
If an improved RCD snubber circuit (as shown in fig. 3) is adopted, although the problem of a continuous discharge loop existing in the circuit during idle standby can be solved, the existence of the zener diode Dz1 can bring larger loss to the circuit in a steady state working state (such as a full load state) to cause serious heat generation, so that the circuit is difficult to apply to the condition of higher output voltage of the circuit; and the performance requirement on the zener diode Dz1 is higher.
Therefore, how to reduce the peak voltage of the secondary side, while achieving low power consumption of the circuit during operation and zero power consumption during idle standby, has become a technical problem to be solved in the industry.
Disclosure of utility model
The utility model provides a switching power supply circuit, power supply equipment, a charging system and electronic equipment, which are used for solving the problem of low power consumption of the circuit in operation and zero power consumption in idle standby under the condition of reducing peak voltage of a secondary side.
According to a first aspect of the present utility model, there is provided a switching power supply circuit comprising: primary side circuit, transformer, secondary side circuit and secondary peak voltage absorbing circuit; the primary side circuit and the secondary side circuit are in electric energy transmission through a transformer; the secondary side circuit is coupled to the load module;
The secondary side circuit comprises a first diode and an output capacitor; the secondary peak voltage absorbing circuit comprises a second diode, an absorbing capacitor and a first resistor; wherein:
The output end of the primary circuit is coupled to the first end of the transformer, the second end of the transformer is coupled to the anode of the first diode and the first end of the absorption capacitor, the cathode of the first diode is coupled to the first end of the output capacitor, the second end of the absorption capacitor is coupled to the first end of the first resistor and the cathode of the second diode, the second end of the first resistor and the anode of the second diode are both coupled to the first end of the output capacitor, the third end of the transformer is coupled to the second end of the output capacitor, and the first end and the second end of the output capacitor are coupled to the first end and the second end of the load module.
Optionally, the secondary spike voltage absorption circuit further comprises a second resistor;
The first end of the second resistor is coupled to the second end of the absorption capacitor, and the second end of the second resistor is coupled to the first end of the first resistor and the cathode of the second diode respectively.
Optionally, the secondary spike voltage absorbing circuit further comprises a third resistor;
The first end of the third resistor is coupled to the second end of the absorption capacitor and the first end of the first resistor, respectively, and the second end of the third resistor is coupled to the cathode of the second diode.
Optionally, the transformer comprises a primary winding and a secondary winding;
The first end and the second end of the primary winding are respectively coupled to the first output end and the second output end of the primary side circuit; the first output end of the secondary winding is respectively coupled to the anode of the first diode and the first end of the absorption capacitor, and the second end of the secondary winding is coupled to the second end of the output capacitor.
Optionally, the primary side circuit comprises a switching tube module, an RCD absorption circuit and a power supply side capacitor;
The first end of the RCD absorption circuit is coupled to the first end of the primary winding, the second end of the RCD absorption circuit and the first end of the switching tube module are both coupled to the second end of the primary winding, the third end of the RCD absorption circuit is grounded through the power supply side capacitor, and the second end of the switching tube module is grounded.
Optionally, the switching tube module comprises a switching tube control unit, a first switching tube and a fourth resistor;
The output end of the switching tube control unit is coupled to the control end of the first switching tube, the first end of the first switching tube is coupled to the second end of the primary winding, and the second end of the first switching tube is grounded through the fourth resistor.
Optionally, the RCD snubber circuit includes a fifth resistor, a sixth resistor, a first capacitor, and a third diode;
The first end of the fifth resistor and the first end of the first capacitor are respectively coupled to the first end of the primary winding and the first end of the power supply side capacitor, the second end of the fifth resistor and the second end of the first capacitor are respectively coupled to the cathode of the third diode, and the anode of the third diode is coupled to the second end of the primary winding through the sixth resistor.
According to a second aspect of the present utility model there is provided a power supply device comprising the switching power supply circuit provided in any one of the first aspects of the present utility model.
According to a third aspect of the present utility model, there is provided a charging system comprising the power supply apparatus provided in the second aspect of the present utility model.
According to a fourth aspect of the present utility model there is provided an electronic device comprising a switching power supply circuit as provided in any one of the first aspects of the present utility model.
In the switching power supply circuit, the power supply equipment, the charging system and the electronic equipment provided by the utility model, the output end of the primary circuit of the switching power supply circuit is coupled to the first end of the transformer, the second end of the transformer is respectively coupled to the anode of the first diode and the first end of the absorption capacitor, the cathode of the first diode is coupled to the first end of the output capacitor, the second end of the absorption capacitor is respectively coupled to the first end of the first resistor and the cathode of the second diode, the second end of the first resistor and the anode of the second diode are both coupled to the first end of the output capacitor, the third end of the transformer is coupled to the second end of the output capacitor, and the first end and the second end of the output capacitor are respectively coupled to the first end and the second end of the load module; therefore, the peak voltage of the secondary side can be reduced when the circuit provided by the utility model works, and the power consumption of the circuit is lower; and when the circuit is in idle standby, the electric energy stored in the absorption capacitor is discharged to the output capacitor, so that the voltages at two ends of the absorption capacitor and the output capacitor are the same, and the power consumption of the circuit is zero.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.
FIG. 1 is a schematic diagram of a prior art switching power supply circuit;
FIG. 2 is a schematic diagram of a second prior art switching power supply circuit;
FIG. 3 is a schematic diagram of a third prior art switching power supply circuit;
FIG. 4 is a schematic diagram of a switching power supply circuit according to an embodiment of the present utility model;
FIG. 5 is a second schematic diagram of a switching power supply circuit according to an embodiment of the present utility model;
FIG. 6 is a schematic diagram of a third embodiment of a switching power supply circuit according to the present utility model;
FIG. 7 is a schematic diagram of a switching power supply circuit according to an embodiment of the present utility model;
FIG. 8 is a schematic diagram of a switching power supply circuit according to an embodiment of the present utility model;
FIG. 9 is a schematic diagram of a switching power supply circuit according to an embodiment of the present utility model;
Reference numerals illustrate:
10-primary side circuitry;
101-a switching tube module;
1011—a switching tube control unit;
102-RCD snubber circuits;
a 20-transformer;
30-secondary side circuitry;
40-a secondary spike voltage absorption circuit;
a 50-load module;
D1-a first diode;
D2—a second diode;
D3-a third diode;
c1-an output capacitor;
C2-absorption capacitance;
c3-a first capacitance;
Cin-power supply side capacitance;
R1-a first resistor;
R2-a second resistor;
r3-a third resistor;
r4-fourth resistor;
r5-fifth resistor;
R6-sixth resistance;
np-primary winding;
Ns-secondary winding;
Q1-a first switching tube.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The terms "first," "second," "third," "fourth" and the like in the description and in the claims and in the above drawings, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The technical scheme of the utility model is described in detail below by specific examples. The following embodiments may be combined with each other, and some embodiments may not be repeated for the same or similar concepts or processes.
In view of the problems in the prior art that it is difficult to achieve both low power consumption during operation and zero power consumption during idle standby of the circuit while reducing the peak voltage on the secondary side. The utility model provides a switching power supply circuit, which is characterized in that an output end of a primary circuit is coupled to a first end of a transformer, a second end of the transformer is respectively coupled to an anode of a first diode and a first end of an absorption capacitor, a cathode of the first diode is coupled to a first end of an output capacitor, a second end of the absorption capacitor is respectively coupled to a first end of a first resistor and a cathode of a second diode, both the second end of the first resistor and the anode of the second diode are coupled to the first end of the output capacitor, a third end of the transformer is coupled to the second end of the output capacitor, and the first end and the second end of the output capacitor are respectively coupled to the first end and the second end of a load module, so that peak voltage of a secondary side is reduced when the circuit works, and power consumption of the circuit is lower; and when the circuit is in idle standby, the electric energy stored in the absorption capacitor is discharged to the output capacitor, so that the voltages at two ends of the absorption capacitor and the output capacitor are the same, and the power consumption of the circuit is zero.
Referring to fig. 4, an embodiment of the present utility model provides a switching power supply circuit, including: primary side circuit 10, transformer 20, secondary side circuit 30, and secondary spike voltage absorbing circuit 40; the primary side circuit 10 and the secondary side circuit 30 are in electric energy transmission through the transformer 20; the secondary side circuit 30 is coupled to a load module 50;
The secondary side circuit 30 includes a first diode D1 and an output capacitor C1; the secondary spike voltage absorbing circuit 40 includes a second diode D2, an absorbing capacitor C2 and a first resistor R1; wherein:
The output terminal of the primary circuit 10 is coupled to the first terminal of the transformer 20, the second terminal of the transformer 20 is coupled to the anode of the first diode D1 and the first terminal of the snubber capacitor C2, the cathode of the first diode D1 is coupled to the first terminal of the output capacitor C1, the second terminal of the snubber capacitor C2 is coupled to the first terminal of the first resistor R1 and the cathode of the second diode D2, the second terminal of the first resistor R1 and the anode of the second diode D2 are coupled to the first terminal of the output capacitor C1, the third terminal of the transformer 20 is coupled to the second terminal of the output capacitor C1, and the first terminal and the second terminal of the output capacitor C1 are coupled to the first terminal and the second terminal of the load module 50, respectively.
In one embodiment, referring to fig. 5, the transformer 20 includes a primary winding Np and a secondary winding Ns;
The first end and the second end of the primary winding Np are coupled to the first output end and the second output end of the primary side circuit 10, respectively; the first output terminal of the secondary winding Ns is coupled to the anode of the first diode D1 and the first terminal of the absorption capacitor C2, respectively, and the second terminal thereof is coupled to the second terminal of the output capacitor C1.
The working principle of the utility model will now be described with reference to the circuit shown in fig. 5:
When the peak voltage is generated across the first diode D1, the secondary peak voltage absorbing circuit 40 can suppress the peak voltage across the first diode D1, and reduce the oscillation in the loop;
When the peak voltage absorbed by the absorption capacitor C2 is discharged, the absorption capacitor C2 and the first resistor R1, the secondary winding Ns and the output capacitor C1 form a loop, so that the electric energy stored in the absorption capacitor C2 is discharged to the output capacitor C1, and when the voltages at two ends of the absorption capacitor C2 and the output capacitor C1 are the same, no current flows in the secondary peak voltage absorption circuit 40, so that the power consumption is zero, and zero standby power consumption is realized.
In some practical applications of the switching power supply circuit, it is further necessary to suppress spike rings by using a damping resistor, so in a preferred embodiment, referring to fig. 6, the secondary spike voltage absorbing circuit 40 further includes a second resistor R2;
The first end of the second resistor R2 is coupled to the second end of the absorption capacitor C2, and the second end thereof is coupled to the first end of the first resistor R1 and the cathode of the second diode D2, respectively.
In other preferred embodiments, referring to fig. 7, the secondary spike voltage absorbing circuit 40 further includes a third resistor R3;
The first end of the third resistor R3 is coupled to the second end of the absorption capacitor C2 and the first end of the first resistor R1, respectively, and the second end thereof is coupled to the cathode of the second diode D2.
In the above embodiment, the circuit shown in fig. 6 and the circuit shown in fig. 7 can be regarded as equivalent, wherein the second resistor R2 and the third resistor R3 are both damping resistors, and the damping resistors can be set to a smaller value.
The primary circuit 10 will now be further described:
in one embodiment, referring to fig. 8, the primary side circuit 10 includes a switching tube module 101, an RCD snubber circuit 102, and a power supply side capacitor Cin;
The first end of the RCD snubber circuit 102 is coupled to the first end of the primary winding Np, the second end of the RCD snubber circuit 102 and the first end of the switching tube module 101 are both coupled to the second end of the primary winding Np, the third end of the RCD snubber circuit 102 is grounded through the power supply side capacitor Cin, and the second end of the switching tube module 101 is grounded.
Referring to fig. 9, in a specific embodiment of the switching tube module 101, the switching tube module 101 includes a switching tube control unit 1011, a first switching tube Q1, and a fourth resistor R4;
An output terminal of the switching tube control unit 1011 is coupled to a control terminal of the first switching tube Q1, a first terminal of the first switching tube Q1 is coupled to a second terminal of the primary winding Np, and a second terminal of the first switching tube Q1 is grounded through the fourth resistor R4.
Referring to fig. 9, in one embodiment of the RCD snubber circuit 102, the RCD snubber circuit 102 includes a fifth resistor R5, a sixth resistor R6, a first capacitor C3, and a third diode D3;
The first end of the fifth resistor R5 and the first end of the first capacitor C3 are coupled to the first end of the primary winding Np and the first end of the power source side capacitor Cin, respectively, the second end of the fifth resistor R5 and the second end of the first capacitor C3 are coupled to the cathode of the third diode D3, and the anode of the third diode D3 is coupled to the second end of the primary winding Np through the sixth resistor R6.
It should be understood that the present utility model is not limited to the specific forms of components in the switching tube module 101 and the RCD snubber circuit 102, and that the primary side circuit 10 may transmit the input voltage to the secondary side circuit 30 through the transformer 20 without departing from the scope of the present utility model. Those skilled in the art can select an appropriate circuit configuration as desired.
In addition, the utility model also provides power supply equipment, which comprises the switching power supply circuit. By way of example, the power supply device may be a Buck power supply device, a Boost power supply device, etc., but may be any other device suitable for use with a zero power consumption type.
In addition, the utility model also provides a charging system which comprises the power supply device. By way of example, the charging system may be a cell phone charging system or the like.
In addition, the utility model also provides electronic equipment, which comprises the switching power supply circuit. The electronic device may be, for example, a television, an air conditioner, etc., but may be any other device that needs to be powered.
In summary, the output end of the primary circuit is coupled to the first end of the transformer, the second end of the transformer is respectively coupled to the anode of the first diode and the first end of the absorption capacitor, the cathode of the first diode is coupled to the first end of the output capacitor, the second end of the absorption capacitor is respectively coupled to the first end of the first resistor and the cathode of the second diode, the second end of the first resistor and the anode of the second diode are both coupled to the first end of the output capacitor, the third end of the transformer is coupled to the second end of the output capacitor, and the output capacitor is also connected in parallel with the load module, so that the peak voltage of the secondary side can be reduced when the circuit provided by the utility model works, and the power consumption of the circuit is lower; and when the circuit is in idle standby, the electric energy stored in the absorption capacitor is discharged to the output capacitor, so that the voltages at two ends of the absorption capacitor and the output capacitor are the same, and the power consumption of the circuit is zero.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.
Claims (10)
1. A switching power supply circuit, comprising: primary side circuit, transformer, secondary side circuit and secondary peak voltage absorbing circuit; the primary side circuit and the secondary side circuit are in electric energy transmission through a transformer; the secondary side circuit is coupled to the load module;
The secondary side circuit comprises a first diode and an output capacitor; the secondary peak voltage absorbing circuit comprises a second diode, an absorbing capacitor and a first resistor; wherein:
The output end of the primary circuit is coupled to the first end of the transformer, the second end of the transformer is coupled to the anode of the first diode and the first end of the absorption capacitor, the cathode of the first diode is coupled to the first end of the output capacitor, the second end of the absorption capacitor is coupled to the first end of the first resistor and the cathode of the second diode, the second end of the first resistor and the anode of the second diode are both coupled to the first end of the output capacitor, the third end of the transformer is coupled to the second end of the output capacitor, and the first end and the second end of the output capacitor are coupled to the first end and the second end of the load module.
2. The switching power supply circuit of claim 1 wherein said secondary spike voltage sink circuit further comprises a second resistor;
The first end of the second resistor is coupled to the second end of the absorption capacitor, and the second end of the second resistor is coupled to the first end of the first resistor and the cathode of the second diode respectively.
3. The switching power supply circuit of claim 2 wherein said secondary spike voltage sink circuit further comprises a third resistor;
The first end of the third resistor is coupled to the second end of the absorption capacitor and the first end of the first resistor, respectively, and the second end of the third resistor is coupled to the cathode of the second diode.
4. A switching power supply circuit according to any one of claims 1-3, wherein the transformer comprises a primary winding and a secondary winding;
The first end and the second end of the primary winding are respectively coupled to the first output end and the second output end of the primary side circuit; the first output end of the secondary winding is respectively coupled to the anode of the first diode and the first end of the absorption capacitor, and the second end of the secondary winding is coupled to the second end of the output capacitor.
5. The switching power supply circuit of claim 4 wherein said primary side circuit comprises a switching tube module, an RCD snubber circuit, and a power side capacitor;
The first end of the RCD absorption circuit is coupled to the first end of the primary winding, the second end of the RCD absorption circuit and the first end of the switching tube module are both coupled to the second end of the primary winding, the third end of the RCD absorption circuit is grounded through the power supply side capacitor, and the second end of the switching tube module is grounded.
6. The switching power supply circuit according to claim 5, wherein the switching tube module includes a switching tube control unit, a first switching tube, and a fourth resistor;
The output end of the switching tube control unit is coupled to the control end of the first switching tube, the first end of the first switching tube is coupled to the second end of the primary winding, and the second end of the first switching tube is grounded through the fourth resistor.
7. The switching power supply circuit of claim 5 wherein the RCD sink circuit comprises a fifth resistor, a sixth resistor, a first capacitor, and a third diode;
The first end of the fifth resistor and the first end of the first capacitor are respectively coupled to the first end of the primary winding and the first end of the power supply side capacitor, the second end of the fifth resistor and the second end of the first capacitor are respectively coupled to the cathode of the third diode, and the anode of the third diode is coupled to the second end of the primary winding through the sixth resistor.
8. A power supply device comprising the switching power supply circuit of any one of claims 1-7.
9. A charging system comprising the power supply apparatus of claim 8.
10. An electronic device comprising the switching power supply circuit of any one of claims 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323144846.6U CN221283049U (en) | 2023-11-20 | 2023-11-20 | Switching power supply circuit, power supply device, charging system and electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323144846.6U CN221283049U (en) | 2023-11-20 | 2023-11-20 | Switching power supply circuit, power supply device, charging system and electronic device |
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| Publication Number | Publication Date |
|---|---|
| CN221283049U true CN221283049U (en) | 2024-07-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202323144846.6U Active CN221283049U (en) | 2023-11-20 | 2023-11-20 | Switching power supply circuit, power supply device, charging system and electronic device |
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| Country | Link |
|---|---|
| CN (1) | CN221283049U (en) |
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2023
- 2023-11-20 CN CN202323144846.6U patent/CN221283049U/en active Active
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