DC power supply and power supply system

Abstract

The utility model provides a DC power supply and a power supply system. An anti-reverse diode is arranged in a direct-current path of the direct-current power supply; the DC power supply includes: a clamping unit; the first end of the clamping unit is connected with the anode of the anti-reverse diode, and the second end of the clamping unit is connected with the cathode of the anti-reverse diode; and the clamping unit is used for clamping the voltage at the two ends of the anti-reverse diode. The anti-reverse diode in the direct-current power supply is connected with the clamping unit in parallel, and the pulse peak is clamped and absorbed by the clamping unit when reaching the anti-reverse diode, so that the anti-reverse diode cannot be reversely broken down, the direct-current power supply is prevented from being damaged, and the safety and reliability of the direct-current power supply are effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of power supply technology, and in particular to a DC power supply and power supply system. Background Technology

[0002] In high-power applications, multiple DC power supplies are typically connected in parallel to increase the total output current and power. When multiple DC power supplies are connected in parallel, anti-reverse diodes are usually installed in each DC power supply to prevent voltage backflow at the parallel output points.

[0003] In the existing technology, if the output wiring of each DC power supply is very long and connected in parallel, it will result in a large amount of parasitic inductance on the connection line. When some DC power supplies in the power system are not working, the parasitic inductance will form a large voltage spike that flows back into the cathode of the reverse protection diode, causing the diode to withstand a large reverse voltage or even break down, which seriously affects the safety and reliability of the power system. Utility Model Content

[0004] This utility model provides a DC power supply and power system to solve the problem that in power systems with multiple DC power supplies connected in parallel, the anti-reverse diode is easily broken down, affecting the system's safety and reliability.

[0005] In a first aspect, this utility model embodiment provides a DC power supply, wherein an anti-reverse diode is provided in the DC path of the DC power supply;

[0006] The DC power supply includes: a clamping unit;

[0007] The first end of the clamping unit is connected to the anode of the anti-reverse diode, and the second end of the clamping unit is connected to the cathode of the anti-reverse diode.

[0008] The clamping unit is used to clamp the voltage across the anti-reverse diode.

[0009] Optionally, the clamping unit includes: a surge protector;

[0010] The first end of the surge protector forms the first end of the clamping unit, and the second end of the surge protector forms the second end of the clamping unit.

[0011] Optionally, the surge protector includes: at least one varistor;

[0012] At least one varistor is connected in series between the first terminal and the second terminal of the surge protector.

[0013] Optionally, the clamping unit may also include: a fuse;

[0014] The fuse and surge protector are connected in series between the first and second ends of the clamping unit. Optionally, the DC power supply may also include a power unit.

[0015] The input terminal of the power unit is used to connect to an external power supply;

[0016] The positive output terminal of the power unit is connected to the anode of the anti-reverse diode and the first terminal of the clamping unit, respectively. The cathode of the anti-reverse diode is connected to the second terminal of the clamping unit to form the positive output terminal of the DC power supply. The negative output terminal of the power unit forms the negative output terminal of the DC power supply.

[0017] Optionally, the DC power supply may also include: a first filter unit;

[0018] The positive input terminal of the first filter unit is connected to the cathode of the anti-reverse diode and the second terminal of the clamping unit, respectively. The negative input terminal of the first filter unit is connected to the negative output terminal of the power unit. The positive output terminal of the first filter unit forms the positive output terminal of the DC power supply, and the negative output terminal of the first filter unit forms the negative output terminal of the DC power supply.

[0019] Optionally, the first filter unit includes: a common-mode inductor, a first common-mode capacitor, a second common-mode capacitor, and a differential-mode capacitor;

[0020] The first end of the first coil of the common-mode inductor forms the positive input terminal of the first filter unit, and the second end of the first coil of the common-mode inductor is connected to the first end of the differential-mode capacitor and the first end of the first common-mode capacitor to form the positive output terminal of the first filter unit.

[0021] The first end of the second coil of the common-mode inductor forms the negative input terminal of the first filter unit, and the second end of the second coil of the common-mode inductor is connected to the second end of the differential-mode capacitor and the first end of the second common-mode capacitor to form the negative output terminal of the first filter unit.

[0022] The second terminal of both the first common-mode capacitor and the second terminal of both common-mode capacitors are grounded.

[0023] Optionally, the DC power supply may also include: a second filter unit;

[0024] The positive input terminal of the second filter unit is connected to the positive output terminal of the power unit, the negative input terminal of the second filter unit is connected to the negative output terminal of the power unit, the positive output terminal of the second filter unit is connected to the anode of the anti-reverse diode and the first terminal of the clamping unit, and the negative output terminal of the second filter unit is connected to the negative input terminal of the first filter unit.

[0025] Optionally, the DC power supply may also include: a power unit;

[0026] The input terminal of the power unit is used to connect to an external power supply;

[0027] The positive output terminal of the power unit forms the positive output terminal of the DC power supply. The negative output terminal of the power unit is connected to the cathode of the anti-reverse diode and the second terminal of the clamping unit, respectively. The anode of the anti-reverse diode is connected to the first terminal of the clamping unit to form the negative output terminal of the DC power supply.

[0028] Secondly, this utility model embodiment provides a power supply system, including at least two DC power supplies as provided in the first aspect of the above embodiment;

[0029] The positive and negative output terminals of each DC power supply are connected in parallel to provide power to the load.

[0030] This invention provides a DC power supply and power system. The DC power supply includes a reverse-biased diode in its DC path. The DC power supply also includes a clamping unit; a first end of the clamping unit is connected to the anode of the reverse-biased diode, and a second end of the clamping unit is connected to the cathode of the reverse-biased diode. The clamping unit clamps the voltage across the reverse-biased diode. In this invention, a clamping unit is connected in parallel across the reverse-biased diode. When a pulse spike reaches the reverse-biased diode, it is clamped and absorbed by the clamping unit, significantly reducing the reverse voltage across the reverse-biased diode. This prevents the reverse-biased diode from being reverse-broken down, effectively avoiding damage to the DC power supply and improving its safety and reliability. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the circuit structure of a DC power supply provided in an embodiment of the present utility model;

[0033] Figure 2 This is a schematic diagram of the circuit structure of a clamping unit provided in an embodiment of the present utility model;

[0034] Figure 3 This is a schematic diagram of the circuit structure of another clamping unit provided in this embodiment of the utility model;

[0035] Figure 4 This is a schematic diagram of the circuit structure of another DC power supply provided in an embodiment of the present utility model;

[0036] Figure 5 This is a schematic diagram of the circuit structure of the third type of DC power supply provided in this embodiment of the present invention;

[0037] Figure 6 This is a circuit schematic diagram of a first filtering unit provided in an embodiment of the present invention;

[0038] Figure 7 This is a schematic diagram of the circuit structure of the fourth DC power supply provided in this embodiment of the present invention;

[0039] Figure 8 This is a schematic diagram of the circuit structure of the fifth DC power supply provided in this embodiment of the present invention;

[0040] Figure 9 This is a schematic diagram of the structure of a power supply system provided in an embodiment of the present utility model;

[0041] Figure 10 This is a schematic diagram of another power supply system provided in an embodiment of the present utility model. Detailed Implementation

[0042] To enable those skilled in the art to better understand this solution, the technical solutions in the embodiments of this solution will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this solution, not all of them. Based on the embodiments of this solution, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this solution.

[0043] The term "comprising" and any other variations thereof in the specification, claims, and accompanying drawings of this invention mean "including but not limited to," and are intended to cover a non-exclusive inclusion, not limited to the examples listed herein. Furthermore, the terms "first" and "second," etc., are used to distinguish different objects, not to describe a specific order.

[0044] For power supply systems with multiple DC power sources connected in parallel, anti-reverse diodes are typically included in the DC power supplies to prevent reverse current flow. These diodes are formed by connecting P-type and N-type semiconductors through a PN junction. When the diode is subjected to reverse bias, the PN junction widens, making it difficult for electron-hole pairs to form, reducing current and achieving reverse cutoff. However, when the reverse bias is too high, the reverse electric field strength of the depletion layer increases, and when it reaches a certain value, breakdown occurs, damaging the diode.

[0045] In a power system with multiple DC power supplies connected in parallel, the parasitic inductance on the conductors can generate large spikes that flow back into the cathode of the reverse protection diode, exceeding its breakdown voltage and causing damage. This severely affects the safety and stability of the power system.

[0046] Based on the above, this utility model embodiment provides an reliable DC power supply to solve the aforementioned problems.

[0047] The implementation of this utility model will be described in detail below with reference to the specific accompanying drawings:

[0048] Figure 1 This is a schematic diagram of a DC power supply provided for an embodiment of the present utility model. (Refer to...) Figure 1 The DC power supply includes an anti-reverse diode D1 in its DC path; the DC power supply includes a clamping unit 1.

[0049] The first end of clamping unit 1 is connected to the anode of anti-reverse diode D1, and the second end of clamping unit 1 is connected to the cathode of anti-reverse diode D1.

[0050] Clamping unit 1 is used to clamp the voltage across the anti-reverse diode D1.

[0051] For a DC power supply equipped with a reverse protection diode D1, this embodiment of the invention connects a clamping unit 1 in parallel on both sides of the reverse protection diode D1. When a spike pulse is introduced into the cathode of the reverse protection diode D1, the clamping unit 1 clamps the voltage on both sides of the reverse protection diode D1, controls the reverse voltage on both sides of the reverse protection diode D1 within a safe range, prevents the spike pulse from damaging the reverse protection diode D1, and effectively improves the safety and reliability of the DC power supply.

[0052] In one possible implementation, refer to Figure 2 The clamping unit may include: surge protector 11;

[0053] The first end of the surge protector 11 forms the first end of the clamping unit 1, and the second end of the surge protector 11 forms the second end of the clamping unit 1.

[0054] The surge protector 11 can be used for clamping. In this embodiment of the invention, the surge protector 11 can form a clamping unit 1 to clamp the reverse protection diode D1. The surge protector 11 is a finished component, with mature technology, multiple options, and low cost, making it suitable for the application of this application.

[0055] In one possible implementation, refer to Figure 2 The surge protector 11 may include at least one varistor RV1;

[0056] At least one varistor RV1 is connected in series between the first terminal and the second terminal of the surge protector 11.

[0057] refer to Figure 2 In this embodiment of the invention, a surge protector 11 formed by connecting at least one varistor RV1 in series can be selected to clamp the voltage and consume the reverse peak energy.

[0058] The varistor RV1 is a voltage-limiting protection device. Utilizing the nonlinear characteristics of the varistor RV1, when an overvoltage occurs between the two terminals of the varistor RV1, the varistor RV1 can clamp the voltage to a relatively fixed voltage value.

[0059] Based on the above analysis, in this embodiment of the present invention, the clamping voltage of the surge protector 11 should be less than the breakdown voltage of the anti-reverse diode D1.

[0060] Meanwhile, the varistor RV1 has a response speed in the nanosecond range, which allows it to react quickly when the spike pulse reaches the cathode of the reverse protection diode D1, so that the spike pulse passes through the varistor RV1 preferentially and does not affect the reverse protection diode D1.

[0061] Furthermore, the varistor RV1 can absorb excess current, eliminating the need for a separate absorption or discharge circuit, effectively protecting sensitive devices, reducing circuit complexity, and consequently lowering circuit costs.

[0062] In one possible implementation, refer to Figure 3 The clamping unit 1 may also include: a fuse F1;

[0063] The fuse F1 is connected in series with the surge protector 11 between the first end of the clamping unit 1 and the second end of the clamping unit 1.

[0064] When the current flowing through surge protector 11 is too large, it may cause irreversible damage to surge protector 11, and may even introduce a reverse peak pulse into the front end through the anode of the anti-reverse diode D1, causing damage to the front end device.

[0065] Therefore, in this embodiment of the present invention, a fuse F1 can also be connected in series with the surge protector 11. When the current is too high for a long time, the fuse will automatically blow to avoid affecting the surge protector 11 and the front-end devices.

[0066] In one possible implementation, the fuse F1 can be a thermal fuse.

[0067] A thermal fuse is a type of circuit breaker that can promptly cut off the circuit when the temperature is too high. It is low in cost, highly reliable, and suitable for the application scenarios described in this application.

[0068] In one possible implementation, refer to Figure 4 The DC power supply may also include: power unit 2;

[0069] The input terminal of power unit 2 is used to connect to an external power supply;

[0070] The positive output terminal of power unit 2 is connected to the anode of anti-reverse diode D1 and the first terminal of clamping unit 1, respectively. The cathode of anti-reverse diode D1 is connected to the second terminal of clamping unit 1 to form the positive output terminal of DC power supply. The negative output terminal of power unit 2 forms the negative output terminal of DC power supply.

[0071] refer to Figure 4 Power unit 2 is used to output DC power, and the anti-reverse diode D1 can be set at the positive terminal of the DC power supply to prevent reverse current.

[0072] In one possible implementation, refer to Figure 5 The DC power supply may also include: a first filter unit 3;

[0073] The positive input terminal of the first filter unit 3 is connected to the cathode of the anti-reverse diode D1 and the second terminal of the clamping unit 1, respectively. The negative input terminal of the first filter unit 3 is connected to the negative output terminal of the power unit 2. The positive output terminal of the first filter unit 3 forms the positive output terminal of the DC power supply, and the negative output terminal of the first filter unit 3 forms the negative output terminal of the DC power supply.

[0074] In this embodiment of the invention, a first filter unit 3 is connected after the anti-reverse diode D1 for filtering, which can effectively suppress harmonic noise at the output end and improve the anti-interference capability and stability of the DC power supply.

[0075] In one possible implementation, refer to Figure 6 The first filter unit 3 may include: a common-mode inductor Lm, a first common-mode capacitor C1, a second common-mode capacitor C2, and a differential-mode capacitor C3;

[0076] The first end of the first coil of the common-mode inductor Lm forms the positive input terminal of the first filter unit 3, and the second end of the first coil of the common-mode inductor Lm is connected to the first end of the differential-mode capacitor C3 and the first end of the first common-mode capacitor C1 to form the positive output terminal of the first filter unit 3.

[0077] The first end of the second coil of the common-mode inductor Lm forms the negative input terminal of the first filter unit 3, and the second end of the second coil of the common-mode inductor Lm is connected to the second end of the differential-mode capacitor C3 and the first end of the second common-mode capacitor C2 to form the negative output terminal of the first filter unit 3.

[0078] The second terminal of the first common-mode capacitor C1 and the second terminal of the second common-mode capacitor C2 are both grounded.

[0079] Noise is generally classified into common-mode noise and differential-mode noise, see reference. Figure 6 In this embodiment of the invention, a common-mode inductor Lm is provided to suppress common-mode noise; a first common-mode capacitor C1 and a second common-mode capacitor C2 are connected in parallel to ground to suppress common-mode noise; and a differential-mode capacitor C3 is connected between the positive and negative terminals to suppress differential-mode noise.

[0080] Among them, the second terminal of the first common-mode capacitor C1 and the second terminal of the second common-mode capacitor C2 can be grounded to connect to the chassis ground.

[0081] In one possible implementation, refer to Figure 7 The DC power supply may also include: a second filter unit 4;

[0082] The positive input terminal of the second filter unit 4 is connected to the positive output terminal of the power unit 2, the negative input terminal of the second filter unit 4 is connected to the negative output terminal of the power unit 2, the positive output terminal of the second filter unit 4 is connected to the anode of the anti-reverse diode D1 and the first terminal of the clamping unit 1, and the negative output terminal of the second filter unit 4 is connected to the negative input terminal of the first filter unit 3.

[0083] In this embodiment of the invention, a second filter unit 4 can also be set in front of the anti-reverse diode D1 to suppress harmonic noise introduced from the front end and improve the anti-interference capability and power quality of the DC power supply.

[0084] In one possible implementation, refer to Figure 8 The DC power supply may also include: power unit 2;

[0085] The input terminal of power unit 2 is used to connect to an external power supply;

[0086] The positive output terminal of power unit 2 forms the positive output terminal of DC power supply. The negative output terminal of power unit 2 is connected to the cathode of anti-reverse diode D1 and the second terminal of clamping unit 1, respectively. The anode of anti-reverse diode D1 is connected to the first terminal of clamping unit 1 to form the negative output terminal of DC power supply.

[0087] In this embodiment of the invention, since a path needs to be formed between the positive and negative output terminals of the DC power supply, therefore, referring to... Figure 8 The anti-reverse diode D1 can also be placed at the negative terminal of the DC power supply (between the negative output terminal of power unit 2 and the negative output terminal of the DC power supply) to prevent reverse flow.

[0088] Similarly, filters can be set before and after the anti-reverse diode D1 to improve the safety and reliability of the DC power supply. The specific filter circuit is the same as... Figure 6 and Figure 7 The specifics will not be elaborated here.

[0089] Furthermore, an anti-reverse diode can be installed at both the positive and negative terminals of the DC power supply, but details will not be elaborated here.

[0090] Corresponding to the above embodiments, refer to Figure 9 This utility model embodiment also provides a power supply system, including the DC power supply provided in any of the above embodiments;

[0091] The positive and negative output terminals of each DC power supply are connected in parallel to provide power to the load.

[0092] The power supply system consists of multiple DC power supplies connected in parallel, and each DC power supply has a reverse protection diode D1 in its DC path to prevent reverse current from flowing through the parallel connection point. Since each DC power supply is equipped with a clamping unit 1, the reverse protection diode D1 in each DC power supply will not be damaged by pulse spikes, thus improving the safety and reliability of the power supply system.

[0093] Meanwhile, since each anti-reverse diode D1 is unaffected by pulse spikes, there is no need to consider the inductance of the connection wires, that is, there is no need to consider the wiring problem, which reduces the complexity of the power supply system design.

[0094] correspond Figure 7 The DC power supply shown is a reference. Figure 10 In this embodiment of the utility model, the power units 2 of each DC power supply in the power supply system are connected to the same external power source. Simultaneously, the positive and negative output terminals of each first filter unit 3 are connected in parallel to supply power to the load. The parallel connection of the DC power supplies provides redundancy, ensuring that the power supply system can still operate normally even when some DC power supplies malfunction, effectively improving the reliability and stability of the power supply system.

[0095] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A DC power supply, characterized in that, An anti-reverse diode is provided in the DC path of the DC power supply. The DC power supply includes: a clamping unit; The first end of the clamping unit is connected to the anode of the anti-reverse diode, and the second end of the clamping unit is connected to the cathode of the anti-reverse diode. The clamping unit is used to clamp the voltage across the anti-reverse diode.

2. The DC power supply as described in claim 1, characterized in that, The clamping unit includes: a surge protector; The first end of the surge protector forms the first end of the clamping unit, and the second end of the surge protector forms the second end of the clamping unit.

3. The DC power supply as described in claim 2, characterized in that, The surge protector includes: at least one varistor; The at least one varistor is connected in series between the first terminal and the second terminal of the surge protector.

4. The DC power supply as described in claim 2, characterized in that, The clamping unit further includes: a fuse; The fuse and the surge protector are connected in series between the first end of the clamping unit and the second end of the clamping unit.

5. The DC power supply according to any one of claims 1 to 4, characterized in that, The DC power supply further includes: a power unit; The input terminal of the power unit is used to connect to an external power source; The positive output terminal of the power unit is connected to the anode of the anti-reverse diode and the first terminal of the clamping unit, respectively. The cathode of the anti-reverse diode is connected to the second terminal of the clamping unit to form the positive output terminal of the DC power supply. The negative output terminal of the power unit forms the negative output terminal of the DC power supply.

6. The DC power supply as described in claim 5, characterized in that, The DC power supply further includes: a first filter unit; The positive input terminal of the first filter unit is connected to the cathode of the anti-reverse diode and the second terminal of the clamping unit, respectively. The negative input terminal of the first filter unit is connected to the negative output terminal of the power unit. The positive output terminal of the first filter unit forms the positive output terminal of the DC power supply, and the negative output terminal of the first filter unit forms the negative output terminal of the DC power supply.

7. The DC power supply as described in claim 6, characterized in that, The first filtering unit includes: a common-mode inductor, a first common-mode capacitor, a second common-mode capacitor, and a differential-mode capacitor; The first end of the first coil of the common-mode inductor forms the positive input terminal of the first filter unit, and the second end of the first coil of the common-mode inductor is connected to the first end of the differential-mode capacitor and the first end of the first common-mode capacitor to form the positive output terminal of the first filter unit. The first end of the second coil of the common-mode inductor forms the negative input terminal of the first filter unit, and the second end of the second coil of the common-mode inductor is connected to the second end of the differential-mode capacitor and the first end of the second common-mode capacitor to form the negative output terminal of the first filter unit. The second terminal of both the first common-mode capacitor and the second common-mode capacitor are grounded.

8. The DC power supply as described in claim 6, characterized in that, The DC power supply further includes: a second filter unit; The positive input terminal of the second filter unit is connected to the positive output terminal of the power unit, the negative input terminal of the second filter unit is connected to the negative output terminal of the power unit, the positive output terminal of the second filter unit is connected to the anode of the anti-reverse diode and the first terminal of the clamping unit, and the negative output terminal of the second filter unit is connected to the negative input terminal of the first filter unit.

9. The DC power supply according to any one of claims 1 to 4, characterized in that, The DC power supply further includes: a power unit; The input terminal of the power unit is used to connect to an external power source; The positive output terminal of the power unit forms the positive output terminal of the DC power supply. The negative output terminal of the power unit is connected to the cathode of the anti-reverse diode and the second terminal of the clamping unit, respectively. The anode of the anti-reverse diode is connected to the first terminal of the clamping unit to form the negative output terminal of the DC power supply.

10. A power supply system, characterized in that, Includes at least two DC power supplies as described in any one of claims 1 to 9; The positive and negative output terminals of each DC power supply are connected in parallel to provide power to the load.

Images