Adjustable power supply device

Abstract

The utility model discloses an adjustable power supply device. The adjustable power supply device comprises a box body and steering wheels mounted at the bottom of the box body, an adjustable direct-current high-power switching power supply, a control transformer, a plurality of power supply output wiring terminals, a power supply main switch and a miniature circuit breaker are arranged in the box body; the wire inlet end of the power supply main switch is connected with an external alternating current power supply; the wire outlet end of the power supply main switch is connected with the wire inlet end of the miniature circuit breaker; the wire outlet end of the miniature circuit breaker is respectively connected with the input end of the adjustable direct-current high-power switching power supply and the input end of the control transformer; the output end of the adjustable direct-current high-power switching power supply is connected with the power supply output wiring terminal; the control transformer comprises a plurality of voltage output ends, and each voltage output end is respectively connected with different power supply output wiring terminals. On the basis of existing parts in the adjustable power supply device, the purpose of outputting power supplies with different requirements can be achieved, and the steering wheels are installed on the box body of the adjustable power supply device, so that the adjustable power supply device is convenient to move.

Description

Technical Field

[0001] This application relates to the technical field of power supplies, and more specifically, to an adjustable power supply device. Background Art

[0002] A switch cabinet is an electrical device whose main function is to switch, control, and protect electrical equipment during the processes of power generation, transmission, distribution, and power conversion in the power system. The power supply of the switch cabinet is not only the power source for the normal operation of the switch cabinet but also an important guarantee for the switch cabinet to achieve functions such as automatic control, protection, monitoring, and data acquisition. Therefore, when designing and using a switch cabinet, the selection and configuration of the power supply must be fully considered to ensure that it can meet the various functional requirements of the switch cabinet and guarantee the stable operation of the power system. For example, in a direct current (DC) system, the working power supply of a 10 kV switch cabinet is DC24V~DC220V.

[0003] Currently, the switch cabinet forms a power supply system by adding the number of batteries. The higher the voltage required for the working power supply, the more batteries are added. Therefore, it is easy to cause the problem that the volume of the device becomes larger and larger, which is not convenient for movement and affects the working efficiency. Summary of the Utility Model

[0004] In view of this, this application provides an adjustable power supply device to solve the problems of low power adjustment efficiency and large volume of the power supply device.

[0005] To achieve the above purpose, the following solutions are proposed:

[0006] The first aspect of this application provides an adjustable power supply device, including: a box body and steering wheels installed at the bottom of the box body;

[0007] An adjustable DC high-power switch power supply, a control transformer, a plurality of power output connection terminals, a main power switch, and a miniature circuit breaker are installed inside the box body;

[0008] The incoming line end of the main power switch is connected to an external AC power supply, and the outgoing line end of the main power switch is connected to the incoming line end of the miniature circuit breaker;

[0009] The outgoing line end of the miniature circuit breaker is respectively connected to the input end of the adjustable DC high-power switch power supply and the input end of the control transformer;

[0010] The output end of the adjustable DC high-power switch power supply is connected to the power output connection terminals;

[0011] The control transformer includes a plurality of voltage output ends, and each voltage output end is respectively connected to a different power output connection terminal.

[0012] In a possible implementation, a high-current generator is further installed inside the box body. The input end of the high-current generator is connected to the outgoing line end of the miniature circuit breaker, and the output end of the high-current generator is connected to the power output terminal block.

[0013] In a possible implementation, an installation track for the miniature circuit breaker is further installed inside the box body.

[0014] In a possible implementation, an installation track for the power output terminal block is further installed inside the box body.

[0015] In a possible implementation, the box body is a three-layer box body provided with two partition boards. The three-layer box body includes: an upper box body, a middle box body, and a lower box body;

[0016] The adjustable DC high-power switch power supply and the control transformer are arranged in the upper box body;

[0017] The installation track for the miniature circuit breaker and the installation track for the power output terminal block are arranged in the middle box body;

[0018] The high-current generator is arranged in the lower box body.

[0019] In a possible implementation, the external AC power supply is a three-phase power supply.

[0020] In a possible implementation, a reserved terminal is further included, which is arranged at the outgoing line end of the miniature circuit breaker.

[0021] In a possible implementation, an indicator light is further included, which is arranged on the top of the box body and is connected in series with the main power switch.

[0022] In a possible implementation, a display screen is further included, which is connected to the power output terminal block.

[0023] In a possible implementation, in the connection line between the output end of the adjustable DC high-power switch power supply and the power output terminal block, and in the connection lines between each voltage output end and different power output terminal blocks, a feedback circuit is further included. The feedback circuit is used to detect the voltage value output by the output end. When the voltage value does not meet the expected value, the feedback circuit dynamically adjusts the parameters of the circuit elements to make the voltage value output by the feedback circuit to the power output terminal block meet the expected value.

[0024] In the adjustable power supply device provided by the present application, an adjustable DC high-power switching power supply and a control transformer are integrated. The external AC power supply provides power for the adjustable DC high-power switching power supply and the control transformer, and a miniature circuit breaker protection circuit is set to ensure the safety of the adjustable power supply device.

[0025] When the switch cabinet needs a DC power supply, the power output terminal connecting the switch cabinet to the output terminal of the adjustable DC high-power switching power supply can be connected, and by adjusting the parameters of the adjustable DC high-power switching power supply, the magnitude of the DC power output by the adjustable power supply device can be controlled. When the switch cabinet needs an AC power supply, the switch cabinet can be connected to the power output terminal connected to the voltage output terminal of the control transformer, and the adjustable power supply device outputs an AC power supply to it. Since the voltage output terminals corresponding to each power output terminal are different, by adjusting the connected power output terminal, the voltage value output by the adjustable power supply device can be adjusted.

[0026] Based on this, compared with the prior art, the present application does not need to add the number of batteries, and on the basis of the existing components in the adjustable power supply device, the purpose of outputting power with different requirements can be achieved. Moreover, steering wheels are installed on the box body of the adjustable power supply device, which is convenient for moving the adjustable power supply device. Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0028] Figure 1 It is a schematic structural diagram of an adjustable power supply device provided by an embodiment of the present utility model;

[0029] Figure 2 It is a circuit connection diagram of an adjustable power supply device provided by an embodiment of the present utility model.

[0030] Legend Explanation:

[0031] 1 - Steering wheel; 2 - High-current generator; 3 - Box body; 4 - Power output terminal; 5 - Installation track of the power output terminal; 6 - Miniature circuit breaker; 7 - Adjustable DC high-power switching power supply; 8 - Control transformer; 9 - Installation track of the miniature circuit breaker; T1 - Control transformer; QF1 to QF6 - Miniature circuit breakers. Detailed Embodiments

[0032] The technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. Multiple technical solutions in the same embodiment, as well as multiple technical solutions in different embodiments, can be combined and arranged to form new technical solutions without contradiction or conflict, and all are within the scope of protection required by the present utility model.

[0033] At present, the working power supply of the 10kV switch cabinet is DC24V~DC220V. In the test work, a power supply system is composed of a power module and a battery. The higher the working power supply voltage, the more batteries are required, resulting in an increasingly large volume of the device, making it inconvenient to move and affecting work efficiency.

[0034] Based on this, the embodiments of the present utility model propose an adjustable power supply device. Referring to Figure 1 , which includes: a box body 3 and a steering wheel 1 installed at the bottom of the box body 3.

[0035] Inside the box body 3, there are installed: an adjustable DC high-power switch power supply 7, a control transformer 8, a plurality of power output connection terminals 5, a main power switch, and a miniature circuit breaker 6.

[0036] The incoming line end of the main power switch is connected to an external AC power supply, and the outgoing line end of the main power switch is connected to the incoming line end of the miniature circuit breaker 6; the outgoing line end of the miniature circuit breaker 6 is respectively connected to the input end of the adjustable DC high-power switch power supply 7 and the input end of the control transformer 8; the output end of the adjustable DC high-power switch power supply 7 is connected to the power output connection terminal 5; the control transformer 8 includes a plurality of voltage output ends, and each voltage output end is respectively connected to a different power output connection terminal 5.

[0037] The box body 1 provides an installation space for the above-mentioned adjustable DC high-power switch power supply 7, control transformer 8, a plurality of power output connection terminals 5, the main power switch, and the miniature circuit breaker 6. A box body with a suitable volume can be selected. And considering the convenience of the power supply, the steering wheel 1 is installed at the bottom of the box body. Optionally, the steering wheel 1 can be a 360° steering wheel, which is convenient for the adjustable power supply device to move in any direction.

[0038] The external AC power supply of the present utility model can select a three-phase power supply. Refer to Figure 2 , the circuit connection diagram of an adjustable power supply device provided by an embodiment of the present utility model. Among them, A, B, C, and N respectively represent the three phase lines (phase A, phase B, and phase C) and the neutral line (N line) of the three-phase power supply. These four lines together constitute the three-phase power supply, providing the required electrical energy for the control transformer T1 and the adjustable DC high-power switch power supply in the circuit. Among them, the three phase lines A, B, and C are used to transmit three-phase alternating current. The three phase lines provide three alternating currents with the same frequency, equal amplitude, and a phase difference of 120 degrees from each other.

[0039] A miniature circuit breaker, abbreviated as MCB (Micro Circuit Breaker / Miniature Circuit Breaker), is a mechanical switching electrical appliance that can connect, carry, and disconnect the current under normal circuit conditions, and can also connect, carry for a certain time, and disconnect the current under specified abnormal circuit conditions (such as overload, short circuit, etc.). Figure 2 In , a miniature circuit breaker is provided on each connecting wire. For example, a miniature circuit breaker QF1 is provided in the line where the three-phase power supply is connected to the adjustable power supply device. In the lines at the connection ends of the control transformer and the adjustable DC high-power switch power supply to the three-phase power supply respectively, miniature circuit breakers are provided. That is, the inlets of the miniature circuit breakers QF2-QF6 are connected to the external AC power supply, or to the outlet of the miniature circuit breaker QF1 connected to the external AC power supply. The outlets of the miniature circuit breakers QF2-QF6 are respectively connected to the input ends of devices such as the voltage transformation controller and the adjustable DC high-power switch power supply to ensure the circuit safety of each line in the adjustable power supply device and improve the reliability and safety of the adjustable power supply device.

[0040] A DC high-power switch power supply is a power conversion device that can convert an AC power supply into a DC power supply with a relatively large power (usually several kilowatts to dozens of kilowatts or more). The adjustable DC high-power switch power supply adopted in the embodiment of this application is provided with an adjustment button. The staff can adjust the required target DC voltage by operating the adjustment button.

[0041] Refer to Figure 2 , the control transformer T1 has multiple output terminals, and the number of turns of the windings of the control transformer corresponding to each output terminal is different. It can be understood that the output voltage of the transformer is closely related to the turns ratio of its windings. Under the same input voltage, the ratio between the number of turns of the input-side winding and the number of turns of the output-side winding determines the magnitude of the output voltage. Therefore, Figure 2For the ports corresponding to 2, 6, 10, and 12 in the control transformer, the output voltages are different. Therefore, each port is connected to a power output terminal 5. The staff can select a corresponding power output terminal for connection according to the magnitude of the AC power required by the switch cabinet and the magnitude of the output voltage corresponding to each power output terminal.

[0042] In summary, in the adjustable power supply device provided by the embodiment of the present application, an adjustable DC high-power switch power supply and a control transformer are integrated. The external AC power supply provides power for the adjustable DC high-power switch power supply and the control transformer, and a miniature circuit breaker protection circuit is set to ensure the safety of the adjustable power supply device.

[0043] When the switch cabinet needs a DC power supply, the power output terminal connected to the output end of the adjustable DC high-power switch power supply of the switch cabinet can be connected, and the magnitude of the DC power output by the adjustable power supply device can be controlled by adjusting the parameters of the adjustable DC high-power switch power supply. When the switch cabinet needs an AC power supply, the switch cabinet can be connected to the power output terminal connected to the voltage output end of the control transformer. The adjustable power supply device outputs an AC power supply to it. Since the voltage output ends corresponding to each power output terminal are different, the voltage value output by the adjustable power supply device can be adjusted by adjusting the connected power output terminal.

[0044] Based on this, compared with the prior art, the embodiment of the present application does not need to add the number of batteries. On the basis of the existing components in the adjustable power supply device, the purpose of outputting power with different requirements can be achieved, and steering wheels are installed on the box body of the adjustable power supply device, which is convenient for moving the adjustable power supply device.

[0045] Next, other possible implementations of the adjustable power supply device provided by the embodiment of the present application will be described.

[0046] In a possible implementation, a large current generator is further installed inside the box body. The input end of the large current generator is connected to the outgoing line end of the miniature circuit breaker, and the output end of the large current generator is connected to the power output terminal.

[0047] During the test of the 10 kV relay protection device, a three-phase 100 V power supply voltage needs to be provided by the microcomputer relay protection test device. During the test work, a large current of several hundred amperes needs to be applied to the primary part current transformer. The microcomputer relay protection device can only output a maximum current of 40 A, which cannot meet the test requirements and has low use efficiency.

[0048] In the embodiment of the present utility model, a large current generator, also known as a current booster, is provided in the adjustable power supply device to generate high-intensity current, which is not affected by the miniature circuit breaker. The staff only needs to operate the control button or control panel in the large current generator to control the high-intensity current output required by the large current generator. There is a power output wiring terminal connected to the output end of the large current generator. Connecting the power output wiring terminal to the test device or test circuit can solve the problem that the test fails due to the inability to output high-intensity current.

[0049] In another possible implementation, referring to Figure 1 , the box body 1 is a three-layer box body provided with two partition boards. The three-layer box body includes: an upper box body, a middle box body, and a lower box body. The adjustable DC high-power switch power supply 7 and the control transformer 8 are arranged in the upper box body; the installation rails of the miniature circuit breaker 6 and the installation rails of the power output wiring terminal 5 are arranged in the middle box body; the large current generator 2 is arranged in the lower box body.

[0050] The adjustable power supply device in the embodiment of the present utility model can be regarded as a movable test power supply device for a switch cabinet. The device is divided into three layers. The upper layer is equipped with an adjustable DC high-power switch power supply and a control transformer, which is convenient for the staff to perform adjustment operations.

[0051] The middle layer is provided with the installation rails of the miniature circuit breaker and the installation rails of the power output wiring terminal. As can be seen from the above, the number of miniature circuit breakers and power output wiring terminals is relatively large. If they are scattered inside the box body, it is easy to have wire entanglement, difficult maintenance, and potential safety hazards. Therefore, installation rails are provided in the middle layer to classify and install the miniature circuit breaker and the power output wiring terminal into the installation rails. For example, mark the power output wiring terminal as the terminal connected to the output end of the adjustable DC high-power switch power supply, and mark the miniature circuit breaker as the circuit breaker connected to the input end of the control transformer, which is convenient for the staff to accurately maintain the adjustable power supply device and improve the accuracy of connecting the output power to the working circuit, avoiding the confusion of the power output wiring terminals and resulting in incorrect power connection.

[0052] The lower layer is used to place the subsequently added hardware, as well as the reserved wiring terminals led out from the outgoing line end of the main power switch or the outgoing line end of the miniature circuit breaker for connection with the subsequently added hardware, such as a large current generator, etc., which is convenient for adding other adjustable power supply devices and improving the compatibility of the adjustable power supply device. The remaining space can also be used as a wire storage room to avoid the problem of low maintenance efficiency caused by wire mess.

[0053] In one possible implementation, the adjustable power supply device may further include: an indicator light arranged on the top of the box body, and the indicator light is connected in series with the main power switch.

[0054] In the embodiment of the present utility model, the indicator light can be used as a prompt light for the start-up or shutdown state of the adjustable power supply device. When the main power switch is in the closed state, the internal circuit of the adjustable power supply device is closed, so the adjustable power supply device starts up and the indicator light lights up. When the main power switch is in the open state, the internal circuit of the adjustable power supply device is disconnected and the indicator light goes out, indicating that the adjustable power supply device is in the shutdown state.

[0055] The indicator light can also be used as a warning light for the safety state of the adjustable power supply device. It can be understood that the main power switch is connected in series with the miniature circuit breakers of each line, so the indicator light is also in a series relationship with the miniature circuit breakers of each line. The miniature circuit breaker is in the on state under normal line conditions. When abnormal phenomena occur in the line, such as excessive current, etc., the miniature circuit breaker switches to the off state to protect the line. Therefore, when the miniature circuit breaker is off, the circuit where the indicator light is located is also in the off state and the indicator light goes out, indicating that there is a circuit safety problem with the current adjustable power supply device, reminding the staff to perform maintenance.

[0056] In a possible implementation, the adjustable power supply device may further include: a display screen connected to the power output terminal. The display screen is used to display the voltage or current value output corresponding to the power output terminal connected to the working circuit.

[0057] In a possible implementation, in the connection line between the output end of the adjustable DC high-power switching power supply and the power output terminal, and in the connection lines between each voltage output end and different power output terminals respectively, there is also provided: a feedback circuit. The feedback circuit is used to detect the voltage value output by the output end. When the voltage value does not meet the expected value, the feedback circuit dynamically adjusts the parameters of the circuit elements so that the voltage value output by the feedback circuit to the power output terminal meets the expected value.

[0058] Due to factors such as wire aging and line temperature, the stability of the output voltage value may be affected, resulting in the output voltage value not being equal to the expected value adjusted by the staff, affecting the normal test work of the switch cabinet.

[0059] Therefore, in the embodiment of the present utility model, a feedback circuit is provided at the output end of the adjustable DC high-power switching power supply and each voltage output end of the control transformer. The input end of the feedback circuit is connected to the above output end, and the output end of the feedback circuit is connected to the power output terminal corresponding to the output end.

[0060] The feedback circuit first plays a role in monitoring the output voltage. If the output voltage of the above output end is equal to the expected value, or the difference between the output voltage and the expected value is within the allowable error range, it is normally output. If the feedback circuit monitors that the difference between the output voltage of the above output end and the expected value exceeds the allowable error range, it proves that the current output voltage cannot stably output the expected value.

[0061] According to the preset feedback control function, the feedback circuit adjusts its own component parameters. For example, it increases the resistance for voltage division, reduces the output voltage to reach the desired voltage value, or calls the battery in the circuit to release voltage to supplement the voltage, etc. Through the dynamic adjustment of the feedback circuit, the voltage is automatically adjusted to maintain a constant voltage or current output. Based on this, the stability of the adjustable voltage device can be improved.

[0062] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An adjustable power supply device, characterized in that, Including: A box body and a steering wheel installed at the bottom of the box body; Inside the box body are installed: an adjustable DC high-power switch power supply, a control transformer, a plurality of power output wiring terminals, a main power switch, and a miniature circuit breaker; The incoming line end of the main power switch is connected to an external AC power supply, and the outgoing line end of the main power switch is connected to the incoming line end of the miniature circuit breaker; The outgoing line ends of the miniature circuit breaker are respectively connected to the input end of the adjustable DC high-power switch power supply and the input end of the control transformer; The output end of the adjustable DC high-power switch power supply is connected to the power output wiring terminals; The control transformer includes a plurality of voltage output ends, and each voltage output end is respectively connected to a different power output wiring terminal.

2. The adjustable power supply device according to claim 1, wherein Inside the box body is also installed: a large current generator, the input end of the large current generator is connected to the outgoing line end of the miniature circuit breaker, and the output end of the large current generator is connected to the power output wiring terminals.

3. The adjustable power supply device according to claim 2, wherein Inside the box body is also installed: an installation track for the miniature circuit breaker.

4. The adjustable power supply device according to claim 3, characterized in that Inside the box body is also installed: an installation track for the power output wiring terminals.

5. The adjustable power supply device according to claim 4, wherein The box body is a three-layer box body provided with two partition plates, and the three-layer box body includes: an upper box body, a middle box body, and a lower box body; The adjustable DC high-power switch power supply and the control transformer are arranged in the upper box body; The installation track for the miniature circuit breaker and the installation track for the power output wiring terminals are arranged in the middle box body; The large current generator is arranged in the lower box body.

6. The adjustable power supply device according to claim 5, characterized in that The external AC power supply is a three-phase power supply.

7. The adjustable power supply device according to claim 6, wherein, Also included is: A reserved wiring terminal arranged at the outgoing line end of the miniature circuit breaker.

8. The adjustable power supply device according to claim 7, wherein Also included is: An indicator light arranged at the top of the box body, and the indicator light is connected in series with the main power switch.

9. The adjustable power supply device according to claim 8, wherein, Also included is: A display screen connected to the power output wiring terminals.

10. The adjustable power supply device according to claim 9, characterized in that, In the connection line between the output end of the adjustable DC high-power switch power supply and the power output wiring terminals, and in the connection line between each voltage output end and a different power output wiring terminal, there is also included: a feedback circuit, the feedback circuit is used to detect the voltage value output by the output end, and when the voltage value does not meet the expected value, the feedback circuit dynamically adjusts the parameters of the circuit elements so that the voltage value output by the feedback circuit to the power output wiring terminals meets the expected value.

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