CN217087507U - Switching power supply circuit capable of restraining surge current and switching power supply - Google Patents
Switching power supply circuit capable of restraining surge current and switching power supply Download PDFInfo
- Publication number
- CN217087507U CN217087507U CN202220773459.5U CN202220773459U CN217087507U CN 217087507 U CN217087507 U CN 217087507U CN 202220773459 U CN202220773459 U CN 202220773459U CN 217087507 U CN217087507 U CN 217087507U
- Authority
- CN
- China
- Prior art keywords
- transistor
- power supply
- switching power
- surge current
- supply circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model discloses a can restrain inrush current's switching power supply circuit, it includes rectifier bridge, inrush current suppression circuit and transformer, rectifier bridge's first end and mains connection, and rectifier bridge's second end is connected with inrush current suppression circuit's first end, and inrush current suppression circuit's second end is connected with the transformer. The surge current suppression circuit comprises a thermistor, a first transistor, an electrolytic capacitor, a resistor and a diode, wherein the first transistor and the thermistor are connected between the electrolytic capacitor and a grounding end in series, a source electrode of the first transistor is connected with an anode of the capacitor, one end of the resistor is connected with a grid electrode of the first transistor, the other end of the resistor is connected with a source electrode of the first transistor, a cathode of the diode is connected with the transformer, and an anode of the diode is connected with the grid electrode of the first transistor. The utility model provides a but restraines surge current's switching power supply circuit is small with low costs to can restrict surge current effectively, guarantee that the power is normal and the reliable operation.
Description
Technical Field
The utility model relates to a switching power supply field especially relates to a can restrain surge current's switching power supply circuit.
Background
The switching power supply uses electronic switching devices (such as transistors, field effect transistors, thyristor, etc.) to continuously turn on and off the electronic switching devices through a control circuit, so that the electronic switching devices perform pulse modulation on input voltage, thereby realizing AC/DC voltage conversion and adjustable and automatic voltage stabilization of output voltage. The driving chip mainly provides a proper PWM (pulse width modulation) signal for the switching device, the control circuit for completing the switching device of the switching power supply is generally called as the driving chip at present, and UC28, 38 series/NCP 1252 and L6599 and the like are widely applied to various AC/DC switching power supplies at present. The main function of the power supply is to provide a switching signal required by a switching tube of the switching power supply. The chips need to provide a stable smooth direct current for the chips in the working process, and as the commercial power belongs to alternating current, the stable smooth direct current can be obtained only after rectification and filtering, when the output power is higher, the capacity of a filter capacitor needs to be larger, and when the capacity of the capacitor is larger, the energy stored in the capacitor is also large, a very high surge current can be generated at the moment of power-on, the surge current is usually more than 100 times larger than that of a switching power supply in normal working, the influence on an air switch of a commercial power grid and a source is larger, even the air switch can be tripped or closed, and at the moment, a circuit for reducing the surge current needs to be arranged in the switching power supply so as to avoid the adverse effect of the switching power supply on the grid and the air switch.
Therefore, the circuit is also called as a low-starting inrush current circuit of a switching power supply, and the conventional method is generally a method of simply connecting a thermistor or a thermistor NTC + relay in series, but the circuit has poor effect or high cost, occupies large space, and is not beneficial to switch miniaturization and light and thin.
SUMMERY OF THE UTILITY MODEL
The main object of the present invention is to provide a switching power supply circuit capable of suppressing surge current, which aims to solve the above technical problem.
In order to achieve the above object, the present invention provides a switching power supply circuit capable of suppressing surge current, which includes a rectifier bridge, a surge current suppression circuit and a transformer, wherein a first end of the rectifier bridge is connected to a mains supply, a second end of the rectifier bridge is connected to the first end of the surge current suppression circuit, and the second end of the surge current suppression circuit is connected to the transformer;
the surge current suppression circuit comprises a thermistor, a first transistor, an electrolytic capacitor, a resistor and a diode, wherein the first transistor and the thermistor are connected between the electrolytic capacitor and a grounding end in series, a source electrode of the first transistor is connected with an anode of the capacitor, one end of the resistor is connected with a grid electrode of the first transistor, the other end of the resistor is connected with a source electrode of the first transistor, a cathode of the diode is connected with the transformer, and an anode of the diode is connected with the grid electrode of the first transistor.
In one embodiment, the first transistor is an N-channel field effect transistor.
In one embodiment, the first transistor is an NPN transistor.
In an embodiment, the switching power supply circuit capable of suppressing the surge current further includes a driving chip and a second transistor, a first end of the second transistor is connected to the transformer, a second end of the second transistor and the driving chip are both connected to the ground terminal, and a third end of the second transistor is connected to the driving chip.
In one embodiment, the thermistor is a positive temperature coefficient thermistor or a negative temperature coefficient thermistor.
In one embodiment, the resistance of the thermistor is 1-56 Ω.
Additionally, the utility model also provides a switching power supply, switching power supply include as above can restrain surge current's switching power supply circuit.
In the technical scheme of the utility model, the switching power supply circuit capable of suppressing surge current comprises a rectifier bridge, a surge current suppression circuit and a transformer, wherein the first end of the rectifier bridge is connected with the mains supply, the second end of the rectifier bridge is connected with the first end of the surge current suppression circuit, and the second end of the surge current suppression circuit is connected with the transformer;
the surge current suppression circuit comprises a thermistor, a first transistor, an electrolytic capacitor, a resistor and a diode, wherein the first transistor and the thermistor are connected between the electrolytic capacitor and a grounding end in series, a source electrode of the first transistor is connected with an anode of the capacitor, one end of the resistor is connected with a grid electrode of the first transistor, the other end of the resistor is connected with a source electrode of the first transistor, a cathode of the diode is connected with the transformer, and an anode of the diode is connected with the grid electrode of the first transistor. The utility model provides a switch power supply circuit that can restrain surge current is simple and practical, and is small with low costs to can restrict surge current effectively, guarantee that the power is normal and the reliable operation.
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, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic circuit diagram of a switching power supply circuit capable of suppressing surge current according to an embodiment of the present invention.
The reference numbers illustrate: 10. a rectifier bridge; 20. a surge current suppression circuit; 21. a first transistor; 22. a thermistor; 23. an electrolytic capacitor; 24. a resistance; 25. a diode; 30. a transformer; 40. a driving chip; 50. a second transistor.
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, descriptions in the present application as to "first", "second", and the like are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Moreover, the technical solutions in the embodiments of the present invention can be combined with each other, but it is necessary to be able to be realized by a person having ordinary skill in the art as a basis, and when the technical solutions are contradictory or can not be realized, the combination of the technical solutions should be considered to be absent, and is not within the protection scope of the present invention.
The utility model provides a can restrain surge current's switching power supply circuit.
As shown in fig. 1, a switching power supply circuit capable of suppressing inrush current provided in an embodiment of the present invention includes a rectifier bridge 10, an inrush current suppression circuit 20, and a transformer 30, wherein a first end of the rectifier bridge 10 is connected to a mains supply, a second end of the rectifier bridge 10 is connected to a first end of the inrush current suppression circuit 20, and a second end of the inrush current suppression circuit 20 is connected to the transformer 30;
the inrush current suppression circuit 20 includes a thermistor 22, a first transistor 21, an electrolytic capacitor 23, a resistor 24, and a diode 25, the first transistor 21 and the thermistor 22 are connected in series between the electrolytic capacitor 23 and a ground terminal, a source of the first transistor 21 is connected to an anode of the capacitor, one end of the resistor 24 is connected to a gate of the first transistor 21, the other end of the resistor 24 is connected to a source of the first transistor 21, a cathode of the diode 25 is connected to the transformer 30, and an anode of the diode 25 is connected to the gate of the first transistor 21.
The switching power supply circuit capable of suppressing surge current further includes a driving chip 40 and a second transistor 50, a first end of the second transistor 50 is connected to the transformer 30, a second end of the second transistor 50 and the driving chip 40 are both connected to a ground terminal, and a third end of the second transistor 50 is connected to the driving chip 40.
In this embodiment, when 110V or 220V ac is input to the input terminal, the ac is rectified by the rectifier bridge 10 to be converted into pulsating dc, and then the pulsating dc flows to the electrolytic capacitor 23 through the thermistor 22 to store energy smoothly, at this time, the first transistor 21 is not operated by the transformer 30, and the level between the gate and the ground terminal is 0, so the D pole-S pole is not conducted, the impedance is infinite, the current only passes through the thermistor 22, the resistance of the thermistor 22 is large, the circuit loop impedance at the moment of power-on is increased, and the surge current at the moment of power-on can be greatly reduced.
When the electrolytic capacitor 23 is fully charged, the driving chip 40 starts to work, the coil of the transformer 30 which is independently supplied with power is electrified, a level between 5V and 20V is output, the first transistor 21 is driven, the D pole and the S pole are conducted, the DS pole impedance of the first transistor 21 is close to 0 omega, and the thermistor 22 is short-circuited, so that the surge current of the switching power supply during starting is reduced, and the loss of the switching power supply during working is reduced.
In the above embodiment, the first transistor 21 is an N-channel fet or an NPN-type triode, the thermistor 22 is a positive temperature coefficient thermistor 22 or a negative temperature coefficient thermistor 22, and the resistance of the thermistor 22 is 1 to 56 Ω. The diode 25 is a switch diode 25 or an ultrafast recovery diode 25, the resistance value of the resistor 24 is generally set to be within 100 kilohms, the electrolytic capacitor 23 is generally an aluminum electrolytic capacitor 23, and the capacity is determined according to the requirement
Further, the utility model also provides a switching power supply, and this switching power supply includes the switching power supply circuit that can restrain surge current. Since the switching power supply adopts all technical solutions of all the embodiments, at least all the beneficial effects brought by the technical solutions of the embodiments are achieved, and no further description is given here.
The above is only the preferred embodiment of the present invention, not limiting the scope of the present invention, all of which are under the concept of the present invention, the equivalent structure transformation made by the contents of the specification and the drawings is utilized, or the direct/indirect application in other related technical fields is included in the patent protection scope of the present invention.
Claims (7)
1. A switching power supply circuit capable of suppressing surge current is characterized by comprising a rectifier bridge, a surge current suppression circuit and a transformer, wherein the first end of the rectifier bridge is connected with mains supply, the second end of the rectifier bridge is connected with the first end of the surge current suppression circuit, and the second end of the surge current suppression circuit is connected with the transformer;
the surge current suppression circuit comprises a thermistor, a first transistor, an electrolytic capacitor, a resistor and a diode, wherein the first transistor and the thermistor are connected between the electrolytic capacitor and a grounding end in series, a source electrode of the first transistor is connected with an anode of the capacitor, one end of the resistor is connected with a grid electrode of the first transistor, the other end of the resistor is connected with a source electrode of the first transistor, a cathode of the diode is connected with the transformer, and an anode of the diode is connected with the grid electrode of the first transistor.
2. The switching power supply circuit capable of suppressing an inrush current as claimed in claim 1, wherein the first transistor is an N-channel field effect transistor.
3. The switching power supply circuit capable of suppressing inrush current as claimed in claim 1, wherein the first transistor is an NPN transistor.
4. The inrush current suppressing switching power supply circuit as claimed in claim 1, wherein the inrush current suppressing switching power supply circuit further comprises a driver chip and a second transistor, a first terminal of the second transistor is connected to the transformer, a second terminal of the second transistor and the driver chip are both connected to a ground terminal, and a third terminal of the second transistor is connected to the driver chip.
5. The switching power supply circuit capable of suppressing inrush current as claimed in claim 1, wherein the thermistor is a positive temperature coefficient thermistor or a negative temperature coefficient thermistor.
6. The switching power supply circuit capable of suppressing inrush current as claimed in claim 5, wherein the thermistor has a resistance of 1 to 56 Ω.
7. A switching power supply characterized in that the switching power supply comprises the switching power supply circuit capable of suppressing an inrush current as claimed in any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220773459.5U CN217087507U (en) | 2022-04-02 | 2022-04-02 | Switching power supply circuit capable of restraining surge current and switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220773459.5U CN217087507U (en) | 2022-04-02 | 2022-04-02 | Switching power supply circuit capable of restraining surge current and switching power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217087507U true CN217087507U (en) | 2022-07-29 |
Family
ID=82555950
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220773459.5U Active CN217087507U (en) | 2022-04-02 | 2022-04-02 | Switching power supply circuit capable of restraining surge current and switching power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217087507U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116054549A (en) * | 2023-03-27 | 2023-05-02 | 苏州海鹏科技有限公司 | Control module for suppressing hot start surge current of switching power supply |
-
2022
- 2022-04-02 CN CN202220773459.5U patent/CN217087507U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116054549A (en) * | 2023-03-27 | 2023-05-02 | 苏州海鹏科技有限公司 | Control module for suppressing hot start surge current of switching power supply |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Maksimovic et al. | Universal-input, high-power-factor, boost doubler rectifiers | |
| CN110417251B (en) | PFC circuit and air conditioner | |
| CN107659160B (en) | A kind of DC-DC constant-current circuit | |
| CN217087507U (en) | Switching power supply circuit capable of restraining surge current and switching power supply | |
| WO2023273847A1 (en) | Input voltage control method | |
| CN109579388B (en) | Compressor soft start control circuit and method and air conditioner | |
| CN214544101U (en) | Bootstrap driving circuit, voltage conversion circuit and energy storage equipment | |
| CN202043032U (en) | Micropower starting circuit of switching power supply | |
| CN108322053A (en) | A kind of Buck conversion circuit | |
| WO2018171613A1 (en) | Two-stage switch power supply | |
| US8213196B2 (en) | Power supply circuit with protecting circuit having switch element for protecting pulse width modulation circuit | |
| CN217427985U (en) | Slow starting circuit and switching power supply | |
| CN216599118U (en) | Flyback power supply parallel switching circuit and device | |
| CN113645735A (en) | Low-power-consumption constant-current starting LED driving power supply | |
| CN210273869U (en) | Inverter, preceding stage circuit thereof and electric appliance | |
| CN208939817U (en) | High-voltage starting circuit and switching power supply | |
| CN210157096U (en) | Synchronous rectification circuit and switching power supply | |
| WO2021047387A1 (en) | Buck topological circuit for power supply | |
| CN209267434U (en) | A kind of capacitor pre-charge circuit | |
| CN114070019A (en) | Drive circuit, drive method and switching power supply | |
| CN209748412U (en) | Flyback switching power supply with wide input voltage | |
| CN207743687U (en) | A kind of accessory power supply with defencive function | |
| CN106655798B (en) | Sine wave intelligent boost conversion device | |
| CN109302052A (en) | High-voltage starting circuit and switching power supply | |
| CN212086071U (en) | Motor control circuit and air conditioning equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |