A DC power distribution unit

Abstract

The utility model relates to a DC power distribution unit, which belongs to the field of DC power distribution technology. The DC power distribution unit includes two input terminals, two selection switches respectively connected to the input terminals, an output terminal and a loop; the two input terminals are respectively connected to two DC power supplies, and only one selection switch is turned on at the same time to realize the selective power distribution function of the two power supplies. Field effect transistors are adopted, which consume low power and generate low heat. No heat sink is required when in use, which effectively saves volume. At the same time, surge protectors, remote signaling circuits and fuses are provided to ensure the safety of the DC power distribution unit itself and the rear-end load. It has a simple structure and a compact size, and has the functions of DC power distribution, surge protection, failure indication and remote signaling alarm. It has powerful functions, high intelligence and a wide range of applications.

Description

Technical Field

[0001] The utility model belongs to the technical field of direct current power distribution, and in particular relates to a direct current power distribution unit. Background Art

[0002] In order to maintain the stable operation of electrical equipment and avoid economic losses caused by power outages, power failures or voltage instability, two or more power supplies are generally configured to power the electrical equipment. When two or more power supplies are used for power supply, a power distribution unit is required.

[0003] With the development of industrial refinement, network server cabinets, electronic equipment cabinets and other products have a trend of small size and intelligent development. There are many electrical devices in the cabinet, and the demand for load current is relatively large. When the existing DC power distribution unit is loaded with a large current, it will generate high heat and have large power loss. It needs to be used with a heat sink, resulting in a complex structural design and a large size, which is not suitable for the installation of small cabinets; the existing power distribution unit can no longer meet the ever-changing power distribution needs. In addition, the existing DC power distribution unit is not highly intelligent and lacks functions such as lightning protection, failure protection, and remote alarm. Utility Model Content

[0004] In view of this, the purpose of the embodiment of the utility model is to provide a DC power distribution unit to solve the problems of high heat generation, large power loss, large volume, etc. existing in the DC power distribution unit in the prior art; at the same time, it has lightning protection function, failure thermal protection function and remote signal alarm function, with a wider range of applicable scenarios and a higher degree of intelligence.

[0005] The embodiment of the utility model is achieved as follows:

[0006] An embodiment of the utility model provides a DC power distribution unit, comprising two input terminals, two selection switches, an output terminal and a loop; one end of the two input terminals is respectively connected to two power supplies, and the other end is respectively connected to the two selection switches, and the other end of the two selection switches is connected to the output terminal; the two selection switches are not turned on at the same time to realize the power distribution function of the two power supplies.

[0007] Preferably, the selection switch includes a field effect transistor and a logic module, wherein the drain of the field effect transistor is connected to the corresponding input terminal, the source is connected to the output terminal, and the gate is connected to the logic module; the logic module is also connected to the drain and the source. The logic module obtains and compares the voltages loaded on the selection switch, and for the side with a smaller voltage, the logic module controls and outputs an electrical signal to the field effect transistor, so that the field effect transistor is turned off, and the side with a smaller voltage is not turned on.

[0008] Preferably, a decoupling inductor is connected in series between the selection switch and the input terminal.

[0009] Preferably, a first fuse is connected in series between the selection switch and the decoupling inductor.

[0010] Preferably, one end of the loop is grounded through a gas discharge tube.

[0011] Preferably, a surge protector is connected in parallel between the two input terminals and the loop.

[0012] Preferably, the DC power distribution unit also includes a telesignaling circuit, which emits two telesignaling currents; the first telesignaling current flows from the plug through the first indicator light and the disconnect switch back to the plug to form an electrical path; the second telesignaling current flows from the plug through the second indicator light and the second fuse back to the plug to form an electrical path.

[0013] Preferably, there are three output terminals, including a first output terminal, a second output terminal, and a third output terminal; the input terminals include a first input terminal and a second input terminal; the first input terminal is connected to the first output terminal, the second input terminal is connected to the third output terminal, and the second output terminal is connected to the two selection switches.

[0014] The beneficial effects of the utility model are:

[0015] The DC power distribution unit provided by the utility model is suitable for the situation of two-way power supply, and any one of them can be selected to provide DC power supply for the rear-end electrical equipment. When one of the ways fails, it can quickly switch to the other way to work, ensuring normal power supply to the rear-end electrical equipment. Field effect transistors are used as switches for circuit conduction and interruption, which consume low power and generate low heat, do not need to be equipped with a heat sink, and effectively save volume. A surge protector is connected in parallel in the circuit and the loop is grounded, which can effectively discharge overcurrent and overvoltage, and avoid surge shocks from damaging the DC power distribution unit and the rear-end equipment. At the same time, a remote signaling circuit is also provided, which can monitor the working status of the surge protector and the selection switch at any time, indicate failure through an indicator light, and has a remote remote signaling alarm function. In addition, the first fuse in the circuit also ensures the safety of the equipment. When the selection switch fails and generates heat, the circuit can be cut off in time to avoid burning of the equipment or affecting the load electrical equipment at the rear end. The DC power distribution unit provided by the utility model has a simple structure and a compact size, has functions of DC power distribution, surge protection, failure indication and remote signal alarm, etc., has powerful functions, a high degree of intelligence and a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings without creative work. As shown in the drawings, the above and other purposes, features and advantages of the utility model will be clearer. The same reference numerals in all the drawings indicate the same parts. The drawings are not deliberately scaled according to the actual size, and the focus is on showing the main purpose of the utility model.

[0017] Figure 1 A schematic diagram showing the use principle of a DC power distribution unit provided by an embodiment of the utility model is shown;

[0018] Figure 2 A circuit diagram of a DC power distribution unit provided by an embodiment of the utility model is shown (excluding the remote signaling circuit);

[0019] Figure 3 Another circuit diagram of a DC power distribution unit provided by an embodiment of the utility model is shown.

[0020] icon:

[0021] 11. First input terminal; 12. Second input terminal; 21. First selection switch; 22. Second selection switch; 31. First output terminal; 32. Second output terminal; 33. Third output terminal; 4. Loop; 5. Plug; 6. Disconnector; 7. Load. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] As shown in this application and the claims, the terms "first", "second", etc. are used only for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0025] It should be understood that when a component is referred to as being "on another component," "connected to another component," "coupled to another component," or "contacting another component," it may be directly on, connected to, coupled to, or contacting the other component, or there may be intervening components. In contrast, when a component is referred to as being "directly on another component," "directly connected to," "directly coupled to," or "directly contacting" another component, there are no intervening components. Similarly, when a first component is referred to as being "electrically in contact with" or "electrically coupled to" a second component, there is an electrical path between the first component and the second component that allows current to flow. The electrical path may include capacitors, coupled inductors, and / or other components that allow current to flow, even without direct contact between conductive components.

[0026] Please refer to Figure 1-Figure 3 As shown, an embodiment of the utility model provides a DC power distribution unit, including two input terminals: a first input terminal 11 and a second input terminal 12, two selection switches connected to the two input terminals respectively: a first selection switch 21 and a second selection switch 22, at least one output terminal and a loop 4. The two input terminals are respectively connected to two DC power supplies for transmitting current; the first selection switch 21 is connected to the first input terminal 11, and the second selection switch 22 is connected to the second input terminal 12; the output terminal is used to connect a load 7, which is specifically an electrical device; only one selection switch remains in an open state at the same time, forming a current path of a certain DC power supply, a corresponding input terminal, a corresponding selection switch, an output terminal and a load.

[0027] In this embodiment, there are preferably three output terminals, namely, a first output terminal 31, a second output terminal 32 and a third output terminal 33. The three output terminals can provide more power interfaces and have a wider range of applications. Of course, more output terminals can be set as needed, and this application does not limit this. Among the three output terminals, the first output terminal 31 and the first input terminal 11 are connected by a conductor, that is, a conductor with negligible resistance is used to transmit current between the two, such as a wire, a cable or a metal sheet with extremely low resistance; the current flows through the first power supply, the first input terminal 11, the first output terminal 31, the load 7 and the loop 4 to form a first circuit. There is no switch on the first circuit. When the first power supply is working normally, the load 7 is connected to the first circuit and can directly use electricity.

[0028] Similarly, the third output terminal 33 and the second input terminal 12 are connected by a conductor, and the current flows through the second power supply, the second input terminal 12, the third output terminal 33, the load 7 and the loop 4 to form a third circuit. There is no switch on the third circuit, and when the second power supply works normally, the load 7 is connected to the third circuit and can directly use electricity.

[0029] Two power supplies, two input terminals, two selection switches, a second output terminal 32, a load 7 and a loop 4 constitute a second circuit, and the second circuit has two branches. As mentioned above, the two selection switches are not turned on at the same time. When the first selection switch 21 is turned on, the first power supply, the first input terminal 11, the first selection switch 21, the second output terminal 32, the load 7 and the loop 4 constitute one branch; when the second selection switch 22 is turned on, the second power supply, the second input terminal 12, the second selection switch 22, the second output terminal 32, the load 7 and the loop 4 constitute another branch. The selection switch can obtain and compare the voltages on the two branches, and control the branch with the larger voltage to be electrically conductive. For example, when the output voltage of the first power supply is greater than the output voltage of the second power supply, the first selection switch 21 is turned on and in working state, and the second selection switch 22 is turned off and does not work. The positive current in the first power supply starts from the positive electrode, passes through the load 7, and then passes through the second output terminal 32, the first selection switch 21, and the first input terminal 11 to return to the negative electrode of the first power supply. At this time, the power consumption of the load 7 after the second output terminal 32 is provided by the first power supply; because the second selection switch 22 is not working, the circuit between the second power supply and the second output terminal 32 is open. Although the second power supply still has voltage output, this branch is not powered. Based on this design, the second output terminal 32 can always output the required high voltage, effectively ensuring the stability of power consumption.

[0030] like Figure 2 , Figure 3As shown, the first selection switch 21 and the second selection switch 22 both include a field effect transistor MOSFET and a logic module IC. The drain of the field effect transistor MOSFET is connected to the input terminal, the source is connected to the second output terminal 32, and the gate is connected to the logic module IC; at the same time, the two ends of the logic module IC are respectively connected to the source and drain of the field effect transistor MOSFET. The two logic modules IC can read the voltage values ​​on the two branches and compare them, and control the branch with a larger voltage to be electrically conductive and the branch with a smaller voltage to be open. The principle is that when the output voltage of the first power supply is higher than the output voltage of the second power supply, the logic module IC obtains that the voltage of the branch where the second selection switch 22 is located is lower, and outputs an electrical signal to the second selection switch 22 through the gate connected thereto, so that the second selection switch 22 is disconnected. In addition, the field effect transistor MOSFET in the selection switch can be one, or it can be connected in parallel, in series, or in parallel and in series. The number and connection method of the field effect transistor MOSFET are not limited, and can refer to the prior art. As long as the selection switch function can be realized, it can be set with reference. The power consumption of the field effect transistor MOSFET is relatively low, and the heat generation is relatively low, so there is no need to set up a heat sink. It not only effectively reduces the volume, but also has a simple structure, less power loss, better power distribution effect, and a wider range of applications. The logic module IC has simple logic and stable control effect, so that the opening and closing states of the two selection switches can be switched in time with voltage changes, and the power distribution efficiency is very high.

[0031] Furthermore, a decoupling inductor L is connected in series between the selection switch and the input terminal, and the decoupling inductor L can limit overcurrent, prevent surge shock caused by current changes, and achieve voltage stabilization. Specifically, the two branches of the second circuit are respectively provided with a decoupling inductor L1 and a decoupling inductor L2, and the decoupling inductor L1 is connected in series between the first input terminal 11 and the first selection switch 21; the decoupling inductor L2 is connected in series between the second input terminal 12 and the second selection switch 22.

[0032] Furthermore, a fuse FU is connected in series between the decoupling inductor L and the selection switch, and the fuse FU has a thermal fuse property; please refer to Figure 2 , Figure 3 As shown, the fuses FU are FU1 and FU2, the fuse FU1 is connected in series between the decoupling inductor L1 and the first selection switch 21, and the fuse FU2 is connected in series between the decoupling inductor L2 and the second selection switch 22, which can protect the two branches of the second circuit respectively. If the field effect transistor MOSFET fails and causes the line to overheat, the fuse FU melts and disconnects the branch, thus avoiding the DC power distribution unit from overheating and causing a fire accident, and effectively protecting the electrical equipment at the back end.

[0033] Furthermore, a surge protector SPD is provided between the first input terminal 11 and the loop 4, and between the second input terminal 12 and the loop 4, and the two surge protectors SPD are connected in parallel with the first circuit and the third circuit respectively. The surge protector SPD has the functions of lightning protection and surge protection. When a peak current or voltage suddenly occurs in the line due to external interference, the surge protector SPD can be turned on and shunted in a very short time, thereby avoiding damage to other devices or equipment in the loop caused by the surge, and protecting the rear-end load. In this embodiment, the two surge protectors SPD can effectively protect the devices in the first power supply electrical path, the second power supply electrical path and the rear-end load. The DC power distribution unit provided in this embodiment realizes the two functions of power distribution and lightning protection. It has a high degree of integration and a compact size.

[0034] In this embodiment, the surge protector SPD includes a transient voltage suppressor diode. It should be understood that the transient voltage suppressor diode is only an optional implementation of the surge protector, and the surge protector may also be a varistor type or a multi-layer gap type. The surge protector SPD is referred to the prior art and is not limited here.

[0035] Furthermore, the DC power distribution unit provided in the embodiment of the present application has a failure indication function and a remote signal alarm function. Figure 3As shown, the DC power distribution unit also includes a remote signaling circuit, which is not connected to the working circuit of the DC power distribution unit and is only used to detect the working state of the DC power distribution unit, and to provide failure indication and remote signaling alarm. The remote signaling circuit specifically has two paths: the first remote signaling circuit and the second remote signaling circuit. The two paths do not interfere with each other, and the remote signaling currents in the two paths are used to detect the working states of different devices respectively. The first remote signaling current flows out from the a area of ​​the plug 5, flows through the first indicator light HL1 and the disconnecting switch 6, and then flows into the b area of ​​the plug to form a path. There are two disconnecting switches 6, which are respectively connected to two surge protectors SPD; when the surge protector SPD fails, the disconnecting switch 6 is disconnected, the circuit is open, and the first indicator light HL1 is extinguished, realizing the failure indication function; at the same time, the plug transmits the information of the circuit opening to the remote server or remote device through network communication to realize the remote signaling alarm function. Please refer to the prior art for the technology of the abutment of the surge protector SPD and the disconnecting switch 6, which will not be repeated here. The second remote signaling current flows out from the c area of ​​the plug 5, flows through the second indicator light HL2 and the fuse FU3, and then flows into the d area of ​​the plug to form a path. There are two fuses FU3, which are respectively set close to the two selection switches; when the selection switch fails, the ambient temperature rises, the fuse FU3 melts, the circuit is open, and the second indicator light HL2 goes out, realizing the failure indication function; at the same time, the plug 5 transmits the information of the open circuit to the remote server or remote device through network communication to realize the remote signaling alarm function. It should be understood that the remote signaling circuit is widely used in electronic devices such as surge protectors. The technology of collecting relevant signals for monitoring and transmitting them to remote users for alarm belongs to the prior art and will not be repeated here. Through this design, the first indicator light HL1 can intuitively indicate the working status of the surge protector SPD, and the second indicator light HL2 can intuitively indicate the working status of the selection switch, with failure indication and remote signaling alarm functions. The DC power distribution unit provided in the embodiment of the present application has the characteristics of intelligence.

[0036] Furthermore, the DC power distribution unit provided in the embodiment of the present application is grounded. Specifically, one end of the loop 4 returns to the first power supply or the second power supply to form an electrical path; the other end is grounded. A gas discharge tube GDT is connected in series between the ground end and the loop end. When an overvoltage occurs, a large amount of current and charge are quickly discharged to the ground through the gas discharge tube GDT; after the overvoltage disappears, the gas discharge tube GDT quickly returns to its original insulation state, and the circuit returns to normal.

[0037] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A DC power distribution unit, characterized in that: It includes two input terminals, two selection switches, an output terminal and a loop; one end of the two input terminals is respectively connected to two power supplies, and the other end is respectively connected to the two selection switches; the other end of the two selection switches is connected to the output terminal; the two selection switches are not turned on at the same time.

2. A DC power distribution unit according to claim 1, characterized in that: The selection switch includes a field effect transistor and a logic module. The drain of the field effect transistor is connected to the corresponding input terminal, the source is connected to the output terminal, and the gate is connected to the logic module. The logic module is also connected to the drain and the source.

3. A DC power distribution unit according to claim 1, characterized in that: A decoupling inductor is connected in series between the selection switch and the input terminal.

4. A DC power distribution unit according to claim 3, characterized in that: A first fuse is connected in series between the selection switch and the decoupling inductor.

5. A DC power distribution unit according to claim 1, characterized in that: One end of the loop is grounded through a gas discharge tube.

6. A DC power distribution unit according to claim 1, characterized in that: A surge protector is connected in parallel between the two input terminals and the loop.

7. A DC power distribution unit according to claim 1, characterized in that: It also includes a remote signaling circuit, which sends out two remote signaling currents; the first remote signaling current flows from the plug through the first indicator light and the disconnect switch back to the plug to form an electrical path; the second remote signaling current flows from the plug through the second indicator light and the second fuse back to the plug to form an electrical path.

8. A DC power distribution unit according to claim 1, characterized in that: The output terminals include a first output terminal, a second output terminal, and a third output terminal; the input terminals include a first input terminal and a second input terminal; the first input terminal is connected to the first output terminal, the second input terminal is connected to the third output terminal, and the second output terminal is connected to the two selection switches.

Images