Load-adjustable simulation load capable of independently testing multiple power supplies with same voltage class
By designing multiple load units and controllers to simulate loads, the problem of not being able to test multiple power supply devices simultaneously was solved, enabling independent load regulation and efficient testing of power supplies of the same voltage level.
Patent Information
- Application Number
- CN202423252632.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-27
- Publication Date
- 2026-02-24
- Estimated Expiration
- 2034-12-27
AI Technical Summary
In existing technologies, load tests on multiple power supply devices need to be conducted individually, as they cannot be performed simultaneously or the load can be adjusted independently, resulting in low test efficiency.
Design a simulated load comprising at least three load units with identical topologies, each connected by multiple parallel load branches, equipped with a controller and switches to enable independent control and regulation of the load, supporting simultaneous testing of multiple power supplies of the same voltage level.
It enables simultaneous testing of multiple power supply devices of the same voltage level, and allows independent adjustment of the load of each power supply device, improving testing efficiency and flexibility.
Smart Images
Figure CN223941076U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of power supply testing, specifically relating to a simulated load that can independently test multiple power supplies of the same voltage level and has an adjustable load. Background Technology
[0002] When performing load tests on certain power supplies, each power supply device is usually equipped with a single simulated load for testing. If multiple power supply devices need to be tested, either other loads need to be prepared for testing, or the test should be conducted after the front-end load device has completed its test. Otherwise, if multiple power supply devices are tested simultaneously using the same set of test loads, it will cause mutual interference. Utility Model Content
[0003] This invention addresses the shortcomings of existing technologies by providing a simulated load that can independently test multiple power supplies of the same voltage level and has an adjustable load.
[0004] To address this, a simulated load is provided, comprising at least three load units with identical topologies. Each load unit is configured to be connected in parallel via at least two load branches. Each load branch is equipped with a branch switch KMRn for controlling the load input into the load unit and a resistive load Rn. The connection points of the parallel connection of each load branch in each load unit serve as the wiring ports of that load unit. The wiring ports of each load unit are led out as external interfaces of the simulated load, and the wiring ports of adjacent load units are connected in parallel via isolating switches. The load also includes a PLC controller, which is electrically connected to the controlled terminals of each switch to achieve corresponding electrical control.
[0005] In one implementation scheme, the load branch is a DC branch, which includes a single-phase switch and a resistive load. The single-phase switch and the resistive load are connected in series, and the two ends of each DC branch in each load unit are connected in parallel as the wiring ports of that load unit. Furthermore, an overcurrent protector is connected in series in each DC branch.
[0006] In another implementation, the load branch is an AC branch, which includes a three-phase switch and three resistive loads with the same resistance. One end of the three resistive loads is connected together, and the other end is connected to each phase of the three-phase line. The three-phase switch is connected in series with the three-phase line, and the terminals of the three-phase lines of each AC branch are connected in parallel as the wiring ports of the load unit. Furthermore, an overcurrent protector is connected in series with each of the three-phase lines in each AC branch. In this invention, AC and DC schemes can coexist in the simulated load.
[0007] As an improvement, the resistance values of the resistive loads in each load branch of each load unit are different.
[0008] As another improvement, an access switch is connected in series on the connection line between the wiring port of each load unit and the corresponding external interface. Furthermore, the access switch is a relay, and the relay is equipped with auxiliary contacts to control the indicator light at the corresponding main circuit wiring point.
[0009] In this invention, the simulated load can be input via a control panel (HMI) or a host computer (PC) to provide the maximum power required for the load test of the power supply equipment. The load will switch circuit breakers or disconnectors according to the instructions issued by the host computer or control panel, allocating several groups to achieve the corresponding maximum input power. Simultaneously with the control of the circuit breaker or disconnector, the corresponding LED indicator at the main circuit wiring terminal of the load will also be controlled, indicating that the power supply equipment to be tested can be connected to the corresponding wiring terminal. At the same time, the load power of the connected power supply can be independently adjusted on the control panel or host computer.
[0010] Compared with the prior art, this utility model enables a single load to simultaneously test multiple power supply devices of the same voltage level, and allows for independent adjustment of the load power of each power supply device. Attached Figure Description
[0011] Figure 1 The topology of this invention is shown when the simulated load is a multi-loop DC load;
[0012] Figure 2 The topology of this invention is shown when the simulated load is a multi-circuit AC load. Detailed Implementation
[0013] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.
[0014] like Figure 1 As shown, the present invention provides a simulated load capable of independently testing multiple power supplies of the same voltage level with adjustable load, comprising at least three load units 1 with identical topologies. Each load unit 1 is configured to be connected in parallel via at least two load branches 11. Each load branch 11 is provided with a branch switch KMRn that controls the load of the branch into the load unit and a resistive load Rn. The connection points at the parallel connection of each load branch 11 in each load unit 1 serve as the wiring ports A and B of the load unit.
[0015] Each load unit 1 has its wiring port leading out as an external interface for simulating the load, and the wiring ports A and B of adjacent load units are connected in parallel via disconnect switches QF2, QF4, QF6...
[0016] It also includes a PLC controller, which is electrically connected to the controlled terminals of each switch to achieve corresponding electrical control.
[0017] Furthermore, each load unit's wiring port is connected in series with access switches QF1, QF3, QF5, etc., on the connection line between the corresponding external interface and the wiring port, so as to absorb the overall independent loading and control of the load unit.
[0018] In the above, to achieve reliable control, sampling relays are preferred for each switch.
[0019] Before conducting a load test on power equipment of the same voltage level, the required load power is entered via a local touchscreen HMI or host computer. The touchscreen HMI or host computer is electrically connected to the PLC, and the command is issued to the PLC. The PLC achieves the load test by changing the conduction of various isolating switches and branch switches. Figure 1 The QF2n and QF2n-1 (e.g., QF2 and QF3) shown are interlocked in electrical wiring and software control to ensure that each circuit is independent. QF2n-1 is equipped with auxiliary contacts that control the indicator lights at the corresponding main circuit wiring points. After confirming the maximum load power, the load will be allocated into several independent load circuits based on the selected maximum power. The indicator lights at the main circuit wiring points of the corresponding load circuits will illuminate, prompting the operator to check the wiring of each individual load circuit. After confirming the differentiation of several individual load circuits, the power required by a single power supply device can be controlled by switching the contactors on and off via an HMI or host computer, thus achieving adjustable power for each individual circuit to meet the load test requirements of each power supply device.
[0020] Because of the integration of multiple resistors, each branch resistor needs to be equipped with a resistor heat dissipation module for independent heat dissipation.
[0021] The simulated load in this embodiment, such as Figure 1 As shown, the load branch can be configured as a DC branch, which includes a single-phase switch and a resistive load. The single-phase switch and the resistive load are connected in series. The two ends of each DC branch in each load unit are connected in parallel as the wiring ports of that load unit. Each DC branch contains overcurrent protectors FU1, FU2, FU3… connected in series to provide independent protection for the branch. The load branch can also be configured as an AC branch, such as… Figure 2 As shown, the AC branch includes a three-phase switch and three resistive loads with the same resistance value. One end of the three resistive loads is connected together, and the other end is connected to each phase of the three-phase line respectively. The three-phase switch is connected in series with the three-phase line. The connection points of the three-phase lines of each AC branch are connected in parallel as the wiring ports of the load unit. At this time, an overcurrent protector is connected in series in the three-phase line of each AC branch.
[0022] Furthermore, in this embodiment, the resistance values of the resistive loads in each load branch of each load unit are different, so that more resistance ranges can be formed in each load unit by combining branch switches to match more load test requirements.
[0023] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.
Claims
1. A simulated load capable of independently testing multiple power supplies of the same voltage level with adjustable load, characterized in that: It includes at least three load units with the same topology. Each load unit is configured to be connected in parallel by at least two load branches. Each load branch is provided with a branch switch KMRn that controls the load of the branch into the load unit and a resistive load Rn. The connection point of each load branch in parallel in each load unit serves as the wiring port of the load unit. Each load unit's wiring port is led out as the external interface of the simulated load, and the wiring ports of adjacent load units are connected in parallel via a disconnecting switch; It also includes a PLC controller, which is electrically connected to the controlled terminals of each switch to achieve corresponding electrical control.
2. The simulated load according to claim 1, characterized in that: The load branch is a DC branch, which includes a single-phase switch and a resistive load. The single-phase switch and the resistive load are connected in series. The two ends of each DC branch in each load unit are connected in parallel as the wiring ports of the load unit.
3. The simulated load according to claim 2, characterized in that: Each of the aforementioned DC branches has an overcurrent protector connected in series.
4. The simulated load according to claim 1, characterized in that: The load branch is an AC branch, which includes a three-phase switch and three resistive loads with the same resistance value. One end of the three resistive loads is connected together, and the other end is connected to each phase of the three-phase line respectively. The three-phase switch is connected in series with the three-phase line, and the connection points of the three-phase lines of each AC branch are connected in parallel as the wiring ports of the load unit.
5. The simulated load according to claim 4, characterized in that: Each AC branch circuit has an overcurrent protector connected in series with each of the three phases.
6. The simulated load according to claim 1, characterized in that: The resistance values of the resistive loads in each load branch of each load unit are different.
7. The simulated load according to claim 1, characterized in that: An access switch is connected in series on the connection line between the wiring port of each load unit and the corresponding external interface.