Power supply circuit

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 step-down transformer, an AC-DC conversion circuit, a first diode and a second diode, and the AC-DC conversion circuit comprises an AC-DC converter and a second DC-DC step-down transformer. Through the implementation of the utility model, the power supply circuit can adopt direct current input or alternating current input or simultaneous input of two types of power supplies, when the direct current is input, the direct current can be subjected to voltage reduction through the DC-DC step-down transformer and then output to electric equipment, and when the alternating current is input, the alternating current is converted into the direct current through the AC-DC conversion module and then output to the electric equipment. And the DC-DC step-down transformer carries out step-down processing, so that direct current output with the same voltage value can be realized no matter which type of power supply input is, the adaptability and the reliability of corresponding products are effectively improved, and mutual influence of output voltages can be prevented by arranging the diodes so as to ensure the stability and the reliability of the circuit.

Description

Technical Field

[0001] The utility model relates to the technical field of circuits, in particular to a power supply circuit. Background Art

[0002] The power supply circuit of electrical equipment usually consists of input power and power processing circuits such as power control and power conversion. The input power type of the power supply circuit in the related technology is usually only a single direct current or a single alternating current. When a certain type of power input cannot be provided in the current scenario, the device will not be able to obtain the power supply voltage, resulting in poor adaptability and low reliability of the device. Utility Model Content

[0003] The utility model provides a power supply circuit, aiming to solve the problem in the related art that the power supply circuit has a single power input type, resulting in poor adaptability and low reliability of the product.

[0004] In order to solve the above technical problems, the utility model provides a power supply circuit, including: a DC input circuit, an AC input circuit, a first DC-DC buck, an AC-DC conversion circuit, a first diode and a second diode, the AC-DC conversion circuit including an AC-DC converter and a second DC-DC buck; the first DC-DC buck is electrically connected to the DC input circuit and the first diode respectively, the first diode is also used to be electrically connected to an external electrical device, the AC-DC converter is electrically connected to the AC input circuit and the second DC-DC buck respectively, the second diode is electrically connected to the second DC-DC buck, and the second diode is also used to be electrically connected to the electrical device.

[0005] Furthermore, the DC input circuit includes 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 buck.

[0006] Further, the power supply circuit also includes a fifth capacitor, a sixth capacitor, a first resistor, a second resistor, a second connector and a third connector; the third end of the first DC-DC buck is electrically connected to the fourth end of the first DC-DC buck through the first resistor, the third end of the first DC-DC buck is also electrically connected to the fifth end of the first DC-DC buck through the second resistor, the fourth end of the first DC-DC buck is electrically connected to the second connector and the first end of the third connector respectively, the fifth end of the first DC-DC buck is electrically connected to the second end of the second connector and the positive electrode of the first diode respectively, the second end of the first diode is electrically connected to the second end of the third connector, the fifth capacitor is electrically connected to the first end and the fourth end of the first DC-DC buck respectively,

[0007] Furthermore, the power supply circuit also includes a second filtering circuit, which includes 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 terminal and the fifth terminal of the first DC-DC buck, and the second inductor is connected in series to the fifth terminal of the first DC-DC buck.

[0008] Furthermore, the AC input circuit includes a fourth connector and an overcurrent protection circuit, the fourth connector is electrically connected to one end of the overcurrent protection circuit and the AC power supply respectively, and the other end of the overcurrent protection circuit is electrically connected to the AC-DC converter.

[0009] Furthermore, it also includes a third connector, a third filtering circuit and a fourth filtering circuit, the third end of the AC-DC converter is electrically connected to the first end of the second DC-DC buck, the fourth end of the AC-DC converter is electrically connected to the second end of the second DC-DC buck and the first end of the third connector respectively, the third end of the second DC-DC buck is electrically connected to the positive electrode of the second diode, the negative electrode of the second diode is electrically connected to the second end of the third connector, the third filtering circuit is electrically connected to the third end and the fourth end of the AC-DC converter respectively, and the fourth filtering circuit is electrically connected to the third end of the second DC-DC buck and the fourth end of the AC-DC converter respectively.

[0010] From the above description, it can be seen that the power supply circuit of the utility model can adopt DC input or AC input or both types of power input at the same time. When DC power is input, the DC power can be stepped down by a DC-DC buck before being output to the power-consuming equipment. When AC power is input, the AC power is converted into DC power by an AC-DC conversion module, and then stepped down by a DC-DC buck. Therefore, no matter which type of power input is used, DC power output with the same voltage value can be achieved, effectively improving the adaptability and reliability of the corresponding products. By setting diodes, the output voltages can be prevented from affecting each other, so as to ensure the stability and reliability of the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of a power supply circuit of an embodiment of the utility model;

[0012] Figure 2 It is a circuit schematic diagram of a power supply circuit on the DC input side of an embodiment of the utility model;

[0013] Figure 3 It is a circuit schematic diagram of a power supply circuit on the AC input side of an embodiment of the utility model;

[0014] Figure 4 The utility model is a circuit schematic diagram of a power supply circuit according to an embodiment of the utility model. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical scheme and advantages of the utility model clearer, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model. In addition, the technical features involved in the various embodiments of the utility model described below can be combined with each other as long as they do not conflict with each other.

[0016] In the related art, due to the single power input type of the power supply circuit, the adaptability and reliability of the device are low. Therefore, an embodiment of the utility model provides a power supply circuit.

[0017] like Figure 1The figure is a schematic diagram of the structure of a power supply circuit provided by an embodiment of the utility model, the power supply circuit includes: a DC input circuit 100, an AC input circuit 200, a first DC-DC buck 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 420; the first DC-DC buck 300 is electrically connected to the DC input circuit 100 and the first diode 500, respectively, the first diode 500 is also used to be electrically connected to an external electrical device 700, the AC-DC converter 410 is electrically connected to the AC input circuit 200 and the second DC-DC buck 420, the second diode 600 is electrically connected to the second DC-DC buck 420, and the second diode 600 is also used to be electrically connected to the electrical device 700.

[0018] Specifically, in this embodiment, the power supply circuit can choose to use DC input or AC input or use DC input and AC input at the same time. When DC power is input, the input DC power can be output after being stepped down by the first DC-DC buck 300. When AC power is input, the AC power is first converted into DC power by the AC-DC converter 410, and then the converted DC power is stepped down by the second DC-DC buck 420. Therefore, no matter which type of power is input, a preset DC power can be obtained, which effectively improves the adaptability and reliability of the product based on the power supply circuit. By setting two diodes, the two output voltages can be prevented from affecting each other, so as to ensure the stability and reliability of the circuit.

[0019] like Figure 2 The circuit diagram of a power supply circuit on the DC input side provided by this embodiment is shown in FIG. Figure 2 The DC input circuit 100 includes a first connector J1 and a first filter circuit. The first connector J1 is electrically connected to a first end of the first filter circuit and a DC power supply respectively. The other end of the first filter circuit is electrically connected to a first DC-DC buck U1 (300).

[0020] Specifically, the first filtering circuit includes a first inductor L1, a first capacitor C1, a second capacitor C2, a third capacitor C3 and a fourth capacitor C4; 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, respectively, 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 buck U1, respectively, 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, respectively, 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, respectively.

[0021] In this embodiment, the first connector J1 is used to connect direct current, for example, 24V direct current. After the connected direct current is filtered by the first filter circuit, a 24V direct current without noise can be obtained, and then the 24V direct current without noise is transmitted to the first DC-DC buck U1 for voltage reduction. The first filter circuit in this embodiment adopts a combination of resistors and capacitors. 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 buck U1, wherein two ends of the first connector J1 correspond to the positive pole of the power supply, and the other two ends correspond to the negative pole of the power supply. The two ends of the first connector J1 corresponding to the positive pole of the power supply are connected to the power input end of the first DC-DC buck U1, and the two ends of the first connector J1 corresponding to the negative pole of the power supply are connected to the ground end of the first DC-DC buck U1, and each filter component is connected between the two connecting lines. The first inductor L1 in this embodiment can be a common mode inductor.

[0022] For further information, see Figure 2 The power supply circuit also 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; the third end of the first DC-DC buck U1 is electrically connected to the fourth end of the first DC-DC buck U1 through the first resistor R1, the third end of the first DC-DC buck U1 is also electrically connected to the fifth end of the first DC-DC buck U1 through the second resistor R2, and the fourth end of the first DC-DC buck U1 is respectively connected to the first end of the second connector J2 and the first end of the third connector J5. The first DC-DC buck U1 is electrically connected to the second end of the second connector J2 and the positive electrode of the first diode D1 (500), respectively. The second end of the first diode D1 is electrically connected to the second end of the third connector J5. The fifth capacitor CY2 is electrically connected to the first end and the fourth end of the first DC-DC buck U1, respectively. The sixth capacitor CY1 is electrically connected to the second end and the fifth end of the first DC-DC buck U1, respectively. The second connector J2 and the third connector J5 are both used to be electrically connected to the external electrical equipment 700.

[0023] The first DC-DC buck U1 in this embodiment is used to buck the input non-cluttered 24V DC power to 15V, and then transmit the bucked DC power to the second connector J2 and the third connector J5, so as to transmit the power supply voltage to the power-consuming device 700 such as the inverter 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 power supply backup on the DC input side is realized through the anti-backflow effect of the first diode D1. The first DC-DC buck U1 in this embodiment can adopt a buck of model VRB2415LD-50WR3, and the Ctrl of the first DC-DC buck U1 is used to connect the control signal generator, and the Trim terminal is connected to the 0V terminal and the +Vo terminal through two resistors, respectively, so as to fine-tune the output voltage.

[0024] Further, see Figure 2 The power supply circuit also includes a second filtering circuit, which 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 terminal and the fifth terminal of the first DC-DC buck U1, and the second inductor L2 is connected in series to the fifth terminal of the first DC-DC buck U1.

[0025] In this embodiment, in order to ensure the stability of the stepped-down DC power, the stepped-down DC power can be filtered through a filter circuit to obtain 15V DC power without noise, which is then transmitted to the second connector J2 and to the third connector J5 through the first diode D1.

[0026] like Figure 3 The circuit diagram of a power supply circuit on the AC input side provided by an embodiment of the present application is shown in FIG. Figure 3 The AC input circuit 200 includes a fourth connector J3 and an overcurrent protection circuit. The fourth connector J3 is electrically connected to one end of the overcurrent protection circuit and the AC power supply, respectively. The other end of the overcurrent protection circuit is electrically connected to the AC-DC converter U2 (410).

[0027] 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. The fuse F1 is electrically connected to the fourth connector J3 and the first end of the AC-DC converter U2, respectively. 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 both 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. 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. The other end of the gas discharge tube GDT is electrically connected to the third end of the fourth connector J3.

[0028] In this embodiment, the fourth connector J3 is used to connect to AC power, for example, 220V AC power, and then after overcurrent protection through the fuse F1, three varistors and a lightning protection device, namely the gas discharge tube GDT, the connected AC power is transmitted to the AC-DC converter U2 to obtain, for example, 30V DC power. Among them, the live wire terminal L and the neutral wire terminal N of the fourth connector J3 are respectively connected to the live wire terminal L and the neutral wire terminal N of the AC-DC converter U2, the fuse F1 is connected in series to the live wire terminal L of the fourth connector J3, the first resistor R1 and the second resistor R2 are both connected between the live wire terminal L and the neutral wire N of the fourth connector J3, one end of the third resistor RV1 is connected to the neutral wire terminal N of the fourth connector J3, and the other end is respectively connected to the common connection end of the second resistor R2 and the neutral wire terminal of the fourth connector J3, and the gas discharge tube GDT. The AC-DC converter U2 in this embodiment can use an AC-DC converter U2 with a model of AME40-15DMAZ.

[0029] For further information, see Figure 3 The power supply circuit also 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 IC3 (420). The fourth end of the AC-DC converter U2 is electrically connected to the second end of the second DC-DC buck IC3 and the first end of the fourth connector J3 respectively. The third end of the second DC-DC buck 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 respectively. The fourth filter circuit is electrically connected to the third end of the second DC-DC buck IC3 and the fourth end of the AC-DC converter U2 respectively.

[0030] In this embodiment, the 30V DC power obtained after being processed by the AC-DC converter U2 can be processed by the third filtering circuit to obtain 30V DC power without noise. The 30V DC power without noise is transmitted to the second DC-DC buck IC3 for processing to obtain 15V DC power, which is then filtered by the fourth filtering circuit and transmitted to the third connector J5 by the second diode D2. Similarly, through the reverse function of the second diode D2, the output voltage on the AC input side can be transmitted to the common connector to back up the AC power.

[0031] For further information, see Figure 3 , also includes a third DC-DC buck IC2, a fifth filtering circuit and a fifth connector, the fifth connector is respectively electrically connected to the fourth end of the AC-DC converter U2, the third filtering circuit, the third end of the second DC-DC buck IC3, and the first end of the third DC-DC buck IC2, the second end of the third DC-DC buck IC2 is electrically connected to the third filtering circuit, the third end of the third DC-DC buck IC2 is electrically connected to the fourth end of the AC-DC converter U2, and the fifth filtering circuit is respectively electrically connected to the first end of the third DC-DC buck IC2 and the fourth end of the AC-DC converter U2.

[0032] 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.

[0033] 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. The fifth connector also receives 15V DC power after being processed by the third filter circuit and a DC-DC buck, and then processed by the fifth filter circuit. Among them, the third filter circuit, the fourth filter circuit and the fifth filter circuit each include two filter capacitors, and the two capacitors are connected in parallel in the corresponding branches. The second DC-DC buck IC3 of this embodiment can use a buck of model SR7805-15, and the third DC-DC buck IC2 can use a buck of model SR7805-05.

[0034] Thus, through the example provided by this application Figure 4The power supply circuit shown, and the related products implemented based on the power supply circuit can use DC input or AC input or both types of power input at the same time. When DC power is input, the DC power can be stepped down by a DC-DC buck before being output to the power-consuming equipment. When AC power is input, the AC power is converted into DC power by an AC-DC conversion module, and then stepped down by a DC-DC buck. Therefore, no matter which type of power input is used, DC power output with the same voltage value can be achieved, effectively improving the adaptability and reliability of related products. By setting a diode, the output voltages can be prevented from affecting each other, ensuring that both types of power input can be used as standby. While ensuring the stability and reliability of the circuit, the power supply requirements of the product can be effectively met.

[0035] It should be noted that the various embodiments in the present invention are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other.

[0036] It should also be noted that, in the present invention, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0037] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined in the present invention may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown in the present invention, but will conform to the widest range consistent with the principles and novel features disclosed in the present invention.

Claims

1. A power supply circuit, characterized in that: include: A DC input circuit, an AC input circuit, a first DC-DC buck, an AC-DC conversion circuit, a first diode and a second diode, wherein the AC-DC conversion circuit includes an AC-DC converter and a second DC-DC buck; The first DC-DC buck is electrically connected to the DC input circuit and the first diode respectively, and the first diode is also used to be electrically connected to an external electrical device. The AC-DC converter is electrically connected to the AC input circuit and the second DC-DC buck respectively, and the second diode is electrically connected to the second DC-DC buck, and the second diode is also used to be electrically connected to the electrical device.

2. The power supply circuit according to claim 1, characterized in that: The DC input circuit includes 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. The other end of the first filter circuit is electrically connected to the first DC-DC buck.

3. The power supply circuit according to claim 2, characterized in that: The first filtering circuit includes a first inductor, a first capacitor, a second capacitor, a third capacitor and a fourth capacitor; the first end and the second end of the first inductor are electrically connected to the first end and the second end of the first connector respectively, the third end and the fourth end of the first inductor are electrically connected to the first end and the second end of the first DC-DC buck respectively, the first capacitor and the second capacitor have both ends electrically connected to the first end and the second end of the first inductor respectively, and the third capacitor and the fourth capacitor have both ends electrically connected to the third end and the fourth end of the first inductor respectively.

4. The power supply circuit according to claim 3, characterized in that: It also includes a fifth capacitor, a sixth capacitor, a first resistor, a second resistor, a second connector and a third connector; the third end of the first DC-DC buck is electrically connected to the fourth end of the first DC-DC buck through the first resistor, the third end of the first DC-DC buck is also electrically connected to the fifth end of the first DC-DC buck through the second resistor, the fourth end of the first DC-DC buck is electrically connected to the second connector and the first end of the third connector respectively, the fifth end of the first DC-DC buck is electrically connected to the second end of the second connector and the positive electrode of the first diode respectively, the second end of the first diode is electrically connected to the second end of the third connector, the fifth capacitor is electrically connected to the first end and the fourth end of the first DC-DC buck respectively, the sixth capacitor is electrically connected to the second end and the fifth end of the first DC-DC buck respectively, and the second connector and the third connector are both used to be electrically connected to external electrical equipment.

5. The power supply circuit according to claim 4, characterized in that: It also includes a second filtering circuit, which includes 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 terminal and the fifth terminal of the first DC-DC buck, and the second inductor is connected in series to the fifth terminal of the first DC-DC buck.

6. The power supply circuit according to claim 1, characterized in that: The AC input circuit includes a fourth connector and an overcurrent protection circuit. The fourth connector is electrically connected to one end of the overcurrent protection circuit and an AC power source respectively, and the other end of the overcurrent protection circuit is electrically connected to the AC-DC converter.

7. The power supply circuit according to claim 6, characterized in that: The overcurrent protection circuit includes 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, respectively. 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 both 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, respectively. 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, characterized in that: It also includes a third connector, a third filtering circuit and a fourth filtering circuit, the third end of the AC-DC converter is electrically connected to the first end of the second DC-DC buck, the fourth end of the AC-DC converter is electrically connected to the second end of the second DC-DC buck and the first end of the third connector respectively, the third end of the second DC-DC buck is electrically connected to the positive electrode of the second diode, the negative electrode of the second diode is electrically connected to the second end of the third connector, the third filtering circuit is electrically connected to the third end and the fourth end of the AC-DC converter respectively, and the fourth filtering circuit is electrically connected to the third end of the second DC-DC buck and the fourth end of the AC-DC converter respectively.

9. The power supply circuit according to claim 8, characterized in that: The invention also includes a third DC-DC buck, a fifth filtering circuit and a fifth connector, wherein the fifth connector is electrically connected to the fourth end of the AC-DC converter, the third filtering circuit, the third end of the second DC-DC buck and the first end of the third DC-DC buck respectively, the second end of the third DC-DC buck is electrically connected to the third filtering circuit, the third end of the third DC-DC buck is electrically connected to the fourth end of the AC-DC converter, and the fifth filtering circuit is electrically connected to the first end of the third DC-DC buck and the fourth end of the AC-DC converter respectively.

10. The power supply circuit according to claim 9, characterized in that: The third filter circuit, the fourth filter circuit and the fifth filter circuit each include a first filter capacitor and a second filter capacitor.

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