CN222827143U

CN222827143U - A power supply circuit

Info

Publication number: CN222827143U
Application number: CN202421578070.0U
Authority: CN
Inventors: 余刚
Original assignee: Shenzhen Hwdadr Microwave Science & Technology Co ltd
Current assignee: Shenzhen Hwdadr Microwave Science & Technology Co ltd
Priority date: 2024-07-04
Filing date: 2024-07-04
Publication date: 2025-05-02
Anticipated expiration: 2034-07-04

Abstract

The utility model provides a power supply circuit which comprises a direct current input circuit, an alternating current input circuit, a first DC-DC voltage reducer, an AC-DC conversion circuit, a first diode and a second diode, wherein the AC-DC conversion circuit comprises an AC-DC converter and a second DC-DC voltage reducer. Through the implementation of the utility model, the power supply circuit can adopt direct current input or alternating current input or two types of power supplies to input simultaneously, when direct current is input, the direct current can be reduced by the DC-DC voltage reducer and then output to electric equipment, when alternating current is input, the alternating current is converted into direct current by the AC-DC conversion module and then reduced by the DC-DC voltage reducer, thereby realizing direct current output with the same voltage value no matter which type of power supply is input, effectively improving the adaptability and reliability of corresponding products, and the mutual influence of output voltages can be prevented by arranging the diode so as to ensure the stability and reliability of the circuit.

Description

Power supply circuit

Technical Field

The utility model relates to the technical field of circuits, in particular to a power supply circuit.

Background

The power supply circuit of the electric equipment is generally composed of an input power supply and power supply processing circuits such as power supply control, power supply conversion and the like, the input power supply type of the power supply circuit in the related technology is usually only single direct current or single alternating current, and when a certain type of power supply input can not be provided in the current scene, the equipment can not acquire power supply voltage, so that the adaptability of the equipment is poor and the reliability is low.

Disclosure of utility model

The utility model provides a power supply circuit, which aims to solve the problems of poor adaptability and low reliability of products caused by single power input type of the power supply circuit in the related technology.

In order to solve the technical problems, the utility model provides a power supply circuit which comprises a direct current input circuit, an alternating current input circuit, a first DC-DC voltage reducer, an AC-DC conversion circuit, a first diode and a second diode, wherein the AC-DC conversion circuit comprises an AC-DC converter and a second DC-DC voltage reducer, the first DC-DC voltage reducer is respectively and electrically connected with the direct current input circuit and the first diode, the first diode is also used for being electrically connected with external electric equipment, the AC-DC converter is respectively and electrically connected with the alternating current input circuit and the second DC-DC voltage reducer, the second diode is electrically connected with the second DC-DC voltage reducer, and the second diode is also used for being electrically connected with the electric equipment.

Further, the direct current input circuit comprises a first connector and a first filter circuit, wherein the first connector is respectively and electrically connected with the first end of the first filter circuit and the direct current power supply, and the other end of the first filter circuit is electrically connected with the first DC-DC voltage reducer.

The power supply circuit further comprises a fifth capacitor, a sixth capacitor, a first resistor, a second connector and a third connector, wherein the third end of the first DC-DC voltage reducer is electrically connected with the fourth end of the first DC-DC voltage reducer through the first resistor, the third end of the first DC-DC voltage reducer is also electrically connected with the fifth end of the first DC-DC voltage reducer through the second resistor, the fourth end of the first DC-DC voltage reducer is respectively electrically connected with the first ends of the second connector and the third connector, the fifth end of the first DC-DC voltage reducer is respectively electrically connected with the second end of the second connector and the positive electrode of the first diode, the second end of the first diode is electrically connected with the second end of the third connector, the fifth capacitor is respectively electrically connected with the first end of the first DC-DC voltage reducer and the first end of the fifth end of the first DC-DC voltage reducer,

The power supply circuit further comprises a second filter circuit, the second filter circuit comprises a second inductor, a seventh capacitor, an eighth capacitor, a ninth capacitor and a tenth capacitor, the seventh capacitor, the eighth capacitor, the ninth capacitor and the tenth capacitor are all electrically connected between the fourth end and the fifth end of the first DC-DC voltage reducer, and the second inductor is connected in series with the fifth end of the first DC-DC voltage reducer.

Further, the alternating current input circuit comprises a fourth connector and an overcurrent protection circuit, wherein the fourth connector is respectively and electrically connected with one end of the overcurrent protection circuit and an alternating current power supply, and the other end of the overcurrent protection circuit is electrically connected with the AC-DC converter.

Further, the AC-DC converter further comprises a third connector, a third filter circuit and a fourth filter circuit, wherein the third end of the AC-DC converter is electrically connected with the first end of the second DC-DC voltage reducer, the fourth end of the AC-DC converter is electrically connected with the second end of the second DC-DC voltage reducer and the first end of the third connector respectively, the third end of the second DC-DC voltage reducer is electrically connected with the positive electrode of the second diode, the negative electrode of the second diode is electrically connected with the second end of the third connector, the third filter circuit is electrically connected with the third end and the fourth end of the AC-DC converter respectively, and the fourth filter circuit is electrically connected with the third end of the second DC-DC voltage reducer and the fourth end of the AC-DC converter respectively.

As can be seen from the above description, the power supply circuit of the present utility model may adopt a DC input or an AC input or both types of power supply, when a DC input, a DC voltage can be reduced by the DC-DC voltage reducer and then output to the electric device, when an AC input, an AC-DC conversion module converts an AC into a DC, and then the DC-DC voltage reducer performs voltage reduction processing, so that no matter which type of power supply input can realize a DC output with the same voltage value, the adaptability and reliability of the corresponding product are effectively improved, and by providing a diode, the output voltages can be prevented from being affected by each other, so as to ensure the stability and reliability of the circuit.

Drawings

FIG. 1 is a schematic diagram of a power supply circuit according to an embodiment of the present utility model;

FIG. 2 is a schematic circuit diagram of a DC input side power supply circuit according to an embodiment of the present utility model;

FIG. 3 is a schematic circuit diagram of a power supply circuit for an AC input side according to an embodiment of the present utility model;

Fig. 4 is a schematic circuit diagram of a power supply circuit according to an embodiment of the utility model.

Detailed Description

In order to make the objects, technical solutions and advantages of the present utility model more apparent, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model. In addition, the technical features of the embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.

In the related art, the problem that the adaptability and the reliability of the device are low due to the fact that the power input type of the power supply circuit is single exists.

Fig. 1 shows a schematic structure diagram of a power supply circuit according to an embodiment of the present utility model, where the power supply circuit includes a DC input circuit 100, an AC input circuit 200, a first DC-DC buck converter 300, an AC-DC conversion circuit 400, a first diode 500 and a second diode 600, the AC-DC conversion circuit 400 includes an AC-DC converter 410 and a second DC-DC buck converter 420, the first DC-DC buck converter 300 is electrically connected to the DC input circuit 100 and the first diode 500, the first diode 500 is further electrically connected to an external electric device 700, the AC-DC converter 410 is electrically connected to the AC input circuit 200 and the second DC-DC buck converter 420, the second diode 600 is electrically connected to the second DC-DC buck converter 420, and the second diode 600 is further electrically connected to the electric device 700.

Specifically, in this embodiment, the power supply circuit may selectively use DC input or AC input or use both DC input and AC input, when a DC power supply is input, the input DC power may be reduced by the first DC-DC voltage reducer 300 and then output, when an AC power supply is input, the AC power is converted into DC power by the AC-DC converter 410, and then the converted DC power is reduced by the second DC-DC voltage reducer 420, so that no matter which type of power supply is input, a DC power with a preset value may be obtained, adaptability and reliability of a product based on the power supply circuit may be effectively improved, and by setting two diodes, two output voltages may be prevented from affecting each other, so as to ensure stability and reliability of the circuit.

Referring to fig. 2, the DC input circuit 100 includes a first connector J1 and a first filter circuit, wherein the first connector J1 is electrically connected to a first end of the first filter circuit and a DC power supply, and the other end of the first filter circuit is electrically connected to a first DC-DC voltage reducer U1 (300).

Specifically, the first filter circuit includes a first inductor L1, a first capacitor C1, a second capacitor C2, a third capacitor C3, and a fourth capacitor C4, where the first end and the second end of the first inductor L1 are electrically connected to the first end and the second end of the first connector J1, the third end and the fourth end of the first inductor L1 are electrically connected to the first end and the second end of the first DC-DC voltage reducer U1, both ends of the first capacitor C1 and the second capacitor C2 are electrically connected to the first end and the second end of the first inductor L1, and both ends of the third capacitor C3 and the fourth capacitor C4 are electrically connected to the third end and the fourth end of the first inductor L1.

In this embodiment, the first connector J1 is configured to be connected to a direct current, for example, to a direct current of 24V, and after the connected direct current is filtered by the first filter circuit, a direct current of 24V without clutter can be obtained, and then the direct current of 24V without clutter is transmitted to the first DC-DC voltage reducer U1 for voltage reduction. The first filter circuit in this embodiment adopts a combination manner of a resistor and a capacitor, the first capacitor C1, the second capacitor C2, the first inductor L1, the third capacitor C3 and the fourth capacitor C4 are all connected between the first connector J1 and the first DC-DC voltage reducer U1, wherein two ends of the first connector J1 correspond to a power supply positive electrode, the other two ends correspond to a power supply negative electrode, two ends of the first connector J1 correspond to the power supply positive electrode are all connected with a power supply input end of the first DC-DC voltage reducer U1, two ends of the first connector J1 correspond to the power supply negative electrode are all connected with a grounding end of the first DC-DC voltage reducer U1, and each filter device is respectively connected between two connecting wires. The first inductor L1 of the present embodiment may be a common mode inductor.

Further, referring to FIG. 2, the power supply circuit further includes a fifth capacitor CY2, a sixth capacitor CY1, a first resistor R1, a second resistor R2, a second connector J2 and a third connector J5, wherein a third end of the first DC-DC voltage reducer U1 is electrically connected with a fourth end of the first DC-DC voltage reducer U1 through the first resistor R1, a third end of the first DC-DC voltage reducer U1 is also electrically connected with a fifth end of the first DC-DC voltage reducer U1 through the second resistor R2, a fourth end of the first DC-DC voltage reducer U1 is electrically connected with a first end of the second connector J2 and a first end of the third connector J5 respectively, a fifth end of the first DC-DC voltage reducer U1 is electrically connected with a second end of the second connector J2 and a positive electrode of the first diode D1 (500), a second end of the first diode D1 is electrically connected with a second end of the third connector J5 respectively, and the fifth capacitor CY2 is electrically connected with the first end of the first DC-DC voltage reducer U1 and the second end of the third connector J1 respectively, and the fourth end of the third connector J5 are electrically connected with the third end of the first DC-DC voltage reducer U1 and the third connector J1 respectively.

The first DC-DC step-down device U1 in this embodiment is configured to step down the input noise-free 24V DC to 15V, and then transmit the step-down DC to the second connector J2 and the third connector J5, so as to transmit the power supply voltage to the electric device 700, such as a frequency converter, through the second connector J2 and the third connector J5, wherein the second connector J2 is a connector corresponding to the DC input side, and the third connector J5 is a connector shared with the ac input side, and the back-flow preventing function of the first diode D1 is implemented, so as to realize the standby of the power supply of the DC input side. The first DC-DC voltage reducer U1 in this embodiment may be a voltage reducer with the model VRB2415LD-50WR3, ctrl of the first DC-DC voltage reducer U1 is used to connect to a control signal generator, trim ends are respectively connected to the 0V end and the +vo end through two resistors, and fine adjustment can be performed on the output voltage.

Still further, referring to fig. 2, the power supply circuit further includes a second filter circuit, the second filter circuit includes a second inductor L2, a seventh capacitor C5, an eighth capacitor C6, a ninth capacitor C7, and a tenth capacitor C8, the seventh capacitor C5, the eighth capacitor C6, the ninth capacitor C7, and the tenth capacitor C8 are all electrically connected between the fourth end and the fifth end of the first DC-DC voltage reducer U1, and the second inductor L2 is connected in series to the fifth end of the first DC-DC voltage reducer U1.

In this embodiment, in order to ensure the stability of the dc power after the voltage reduction adjustment, the dc power after the voltage reduction may be filtered by a filter circuit to obtain a dc power of 15V without noise, and the dc power is transmitted to the second connector J2 and the third connector J5 through the first diode D1.

Referring to fig. 3, an AC input circuit 200 includes a fourth connector J3 and an over-current protection circuit, wherein the fourth connector J3 is electrically connected to one end of the over-current protection circuit and an AC power supply, and the other end of the over-current protection circuit is electrically connected to an AC-DC converter U2 (410).

Specifically, the overcurrent protection circuit includes a fuse F1, a third resistor RV1, a fourth resistor RV2, a fifth resistor RV3, and a gas discharge tube GDT, where the fuse F1 is electrically connected to the fourth connector J3 and the first end of the AC-DC converter U2, the second end of the fourth connector J3 is electrically connected to the second end of the AC-DC converter U2, the third resistor RV1 and the fourth resistor RV2 are electrically connected between the second end of the fourth connector J3 and the second end of the AC-DC converter U2, one end of the fifth resistor RV3 is electrically connected to the second end of the fourth connector J3, and the other end of the fifth resistor RV3 is electrically connected to one end of the gas discharge tube GDT and the second end of the AC-DC converter U2, respectively, and the other end of the gas discharge tube GDT is electrically connected to the third end of the fourth connector J3.

In this embodiment, the fourth connector J3 is used for accessing AC power, for example, 220V AC power, and then, after overcurrent protection is performed through the fuse F1, the three piezoresistors and a lightning protection device, that is, the gas discharge tube GDT, the accessed AC power is transmitted to the AC-DC converter U2, so as to obtain, for example, 30V DC power. The live wire end L and the neutral wire end N of the fourth connector J3 are respectively connected with the live wire end L and the neutral wire end N of the AC-DC converter U2, the fuse F1 is connected in series with the live wire end L of the fourth connector J3, the first resistor R1 and the second resistor R2 are both connected between the live wire end L and the neutral wire N of the fourth connector J3, one end of the third resistor RV1 is connected with the neutral wire end N of the fourth connector J3, and the other end is respectively connected with the common connection end of the second resistor R2 and the neutral wire end of the fourth connector J3, and the gas discharge tube GDT. The AC-DC converter U2 in this embodiment may be an AC-DC converter U2 of the model AME40-15 DMAZ.

Further, referring to fig. 3, the power supply circuit further includes a third connector J5, a third filter circuit and a fourth filter circuit, the third end of the AC-DC converter U2 is electrically connected to the first end of the second DC-DC buck converter IC3 (420), the fourth end of the AC-DC converter U2 is electrically connected to the second end of the second DC-DC buck converter IC3 and the first end of the fourth connector J3, the third end of the second DC-DC buck converter IC3 is electrically connected to the positive electrode of the second diode D2 (600), the negative electrode of the second diode D2 is electrically connected to the second end of the third connector J5, the third filter circuit is electrically connected to the third end and the fourth end of the AC-DC converter U2, and the fourth filter circuit is electrically connected to the third end of the second DC-DC buck converter IC3 and the fourth end of the AC-DC converter U2.

In this embodiment, the 30V DC obtained after the processing of the AC-DC converter U2 is processed by the third filter circuit to obtain a 30V DC without clutter, the 30V DC without clutter is transmitted to the second DC-DC step-down device IC3 to obtain a 15V DC, and then the DC is filtered by the fourth filter circuit and transmitted to the third connector J5 by the second diode D2, and similarly, the output voltage of the AC input side can be transmitted to the common connector by the anti-series function of the second diode D2 to back up the AC.

Further, referring to fig. 3, the DC-DC converter further includes a third DC-DC voltage-reducing device IC2, a fifth filter circuit and a fifth connector, wherein the fifth connector is electrically connected to the fourth end of the AC-DC converter U2, the third filter circuit, the third end of the second DC-DC voltage-reducing device IC3, the first end of the third DC-DC voltage-reducing device IC2, the second end of the third DC-DC voltage-reducing device IC2 is electrically connected to the third filter circuit, the third end of the third DC-DC voltage-reducing device IC2 is electrically connected to the fourth end of the AC-DC converter U2, and the fifth filter circuit is electrically connected to the first end of the third DC-DC voltage-reducing device IC2 and the fourth end of the AC-DC converter U2.

Specifically, the third filter circuit, the fourth filter circuit and the fifth filter circuit all include a first filter capacitor and a second filter capacitor.

In this embodiment, the ac input side also has a fifth connector corresponding to the ac input, which is consistent with the output voltage received by the common connector J5, and the fifth connector also receives the 15V DC power obtained by processing the DC power by the third filter circuit and processing the DC power by the DC-DC voltage reducer, and then processing the DC power by the fifth filter circuit. The third filter circuit, the fourth filter circuit and the fifth filter circuit comprise two filter capacitors which are connected in parallel in the corresponding branches. The second DC-DC step-down IC3 of the present embodiment may be a type SR7805-15 step-down, and the third DC-DC step-down IC2 may be a type SR7805-05 step-down.

Therefore, according to the power supply circuit shown in fig. 4, for example, related products realized based on the power supply circuit can adopt direct current input or alternating current input or two types of power supplies to be input simultaneously, when direct current is input, direct current can be reduced by the DC-DC voltage reducer and then output to electric equipment, when alternating current is input, alternating current is converted into direct current by the AC-DC conversion module and then reduced by the DC-DC voltage reducer, so that direct current output with the same voltage value can be realized no matter which type of power supply input, the adaptability and the reliability of related products are effectively improved, the mutual influence of output voltages can be prevented by arranging the diode, the two types of power supply input can be ensured to be reserved, and the power supply requirement of the products can be effectively met while the stable reliability of the circuit is ensured.

It should be noted that, in the present disclosure, each embodiment is described in a progressive manner, and each embodiment is mainly described as different from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.

It should also be noted that in the present disclosure, relational terms such as first and second, and the like are 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. Moreover, 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 one does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The power supply circuit is characterized by comprising a direct current input circuit, an alternating current input circuit, a first DC-DC voltage reducer, an AC-DC conversion circuit, a first diode and a second diode, wherein the AC-DC conversion circuit comprises an AC-DC converter and a second DC-DC voltage reducer;

The first DC-DC voltage reducer is electrically connected with the direct current input circuit and the first diode respectively, the first diode is further used for being electrically connected with external electric equipment, the AC-DC converter is electrically connected with the alternating current input circuit and the second DC-DC voltage reducer respectively, the second diode is electrically connected with the second DC-DC voltage reducer, and the second diode is further used for being electrically connected with the electric equipment.

2. The power supply circuit of claim 1, wherein the DC input circuit comprises a first connector and a first filter circuit, the first connector is electrically connected to a first end of the first filter circuit and a DC power supply, respectively, and the other end of the first filter circuit is electrically connected to the first DC-DC step-down device.

3. The power supply circuit of claim 2, wherein the first filter circuit comprises a first inductor, a first capacitor, a second capacitor, a third capacitor and a fourth capacitor, wherein the first end and the second end of the first inductor are respectively electrically connected with the first end and the second end of the first connector, the third end and the fourth end of the first inductor are respectively electrically connected with the first end and the second end of the first DC-DC voltage reducer, the two ends of the first capacitor and the second capacitor are respectively electrically connected with the first end and the second end of the first inductor, and the two ends of the third capacitor and the fourth capacitor are respectively electrically connected with the third end and the fourth end of the first inductor.

4. The power supply circuit of claim 3, further comprising a fifth capacitor, a sixth capacitor, a first resistor, a second connector, and a third connector, wherein a third end of the first DC-DC voltage reducer is electrically connected to a fourth end of the first DC-DC voltage reducer through the first resistor, a third end of the first DC-DC voltage reducer is also electrically connected to a fifth end of the first DC-DC voltage reducer through the second resistor, a fourth end of the first DC-DC voltage reducer is electrically connected to a first end of the second connector, a first end of the third connector, a fifth end of the first DC-DC voltage reducer is electrically connected to a second end of the second connector, an anode of the first diode, a second end of the first diode is electrically connected to a second end of the third connector, a fifth capacitor is electrically connected to a fourth end of the first DC-DC voltage reducer, a fourth end of the voltage reducer is electrically connected to a fourth end of the first DC-DC voltage reducer, a fourth end of the fourth capacitor is electrically connected to the fourth end of the first DC-voltage reducer, and the fourth end of the fourth capacitor is electrically connected to the third DC-voltage reducer, and the fourth end of the third connector is electrically connected to the external device.

5. The power supply circuit of claim 4, further comprising a second filter circuit comprising a second inductor, a seventh capacitor, an eighth capacitor, a ninth capacitor, and a tenth capacitor, wherein the seventh capacitor, the eighth capacitor, the ninth capacitor, and the tenth capacitor are all electrically connected between a fourth end and a fifth end of the first DC-DC voltage reducer, and the second inductor is connected in series with the fifth end of the first DC-DC voltage reducer.

6. The power supply circuit of claim 1, wherein the AC input circuit comprises a fourth connector and an over-current protection circuit, the fourth connector being electrically connected to one end of the over-current protection circuit and an AC power supply, respectively, and the other end of the over-current protection circuit being electrically connected to the AC-DC converter.

7. The power supply circuit of claim 6, wherein the overcurrent protection circuit comprises a fuse, a third resistor, a fourth resistor, a fifth resistor and a gas discharge tube, the fuse is electrically connected to the fourth connector and the first end of the AC-DC converter, the second end of the fourth connector is electrically connected to the second end of the AC-DC converter, the third resistor and the fourth resistor are electrically connected between the second end of the fourth connector and the second end of the AC-DC converter, one end of the fifth resistor is electrically connected to the second end of the fourth connector, the other end of the fifth resistor is electrically connected to one end of the gas discharge tube and the second end of the AC-DC converter, and the other end of the gas discharge tube is electrically connected to the third end of the fourth connector.

8. The power supply circuit according to claim 1, further comprising a third connector, a third filter circuit and a fourth filter circuit, wherein the third end of the AC-DC converter is electrically connected to the first end of the second DC-DC step-down device, the fourth end of the AC-DC converter is electrically connected to the second end of the second DC-DC step-down device, the first end of the third connector is electrically connected to the third end of the second DC-DC step-down device, the positive electrode of the second diode is electrically connected to the second end of the third connector, the negative electrode of the second diode is electrically connected to the third end of the AC-DC converter, the fourth end of the AC-DC step-down device, and the fourth filter circuit is electrically connected to the third end of the second DC-DC step-down device, the fourth end of the AC-DC converter, respectively.

9. The power supply circuit of claim 8, further comprising a third DC-DC buck, a fifth filter circuit, and a fifth connector, the fifth connector being electrically connected to the fourth terminal of the AC-DC converter, the third filter circuit, the third terminal of the second DC-DC buck, the first terminal of the third DC-DC buck, the second terminal of the third DC-DC buck being electrically connected to the third filter circuit, the third terminal of the third DC-DC buck being electrically connected to the fourth terminal of the AC-DC converter, the fifth filter circuit being electrically connected to the first terminal of the third DC-DC buck, the fourth terminal of the AC-DC converter, respectively.

10. The power supply circuit of claim 9, wherein the third filter circuit, the fourth filter circuit, and the fifth filter circuit each comprise a first filter capacitor and a second filter capacitor.