Search

CN-121995091-A - Switching electronic load

CN121995091ACN 121995091 ACN121995091 ACN 121995091ACN-121995091-A

Abstract

The application provides a switching type electronic load which is used for testing a direct current power supply. The switched electronic load includes a connection, a switched circuit, and an inductive component. The connecting end is used for being electrically connected with the output end of the direct-current power supply. The switching circuit selectively provides a first direct current voltage in a first voltage range or a second direct current voltage in a second voltage range according to the test command. The inductive component is electrically connected between the connecting end and the switching circuit. Wherein the first voltage range is not less than zero voltage and the second voltage range is less than zero voltage. The test command is related to the output voltage and the output current provided by the DC power supply, and the output voltage is positive voltage.

Inventors

  • WANG JUNKAI
  • WU JIANMING

Assignees

  • 致茂电子(苏州)有限公司

Dates

Publication Date
20260508
Application Date
20241105

Claims (5)

  1. 1. A switched-mode electronic load for testing a dc power supply, the switched-mode electronic load comprising: the connecting end is used for being electrically connected with an output end of the direct current power supply; a switching circuit selectively providing a first DC voltage in a first voltage range or a second DC voltage in a second voltage range according to a test command, and An inductive component electrically connected between the connection end and the switching circuit; Wherein the first voltage range is not less than zero voltage and the second voltage range is less than zero voltage; The test command is related to an output voltage and an output current provided by the DC power supply, and the output voltage is a positive voltage.
  2. 2. The switched-mode electronic load of claim 1, wherein the switched-mode circuit provides the second dc voltage during a specified time interval when the switched-mode circuit determines that the test command indicates that a current rate of change of the output current during the specified time interval is greater than a first threshold.
  3. 3. The switched mode electronic load of claim 2, wherein the switched mode circuit provides the first dc voltage during the specified time interval when the switched mode circuit determines that the test command indicates that the current rate of change of the output current during the specified time interval is not greater than the first threshold.
  4. 4. The switch-mode electronic load of claim 3, wherein the switch-mode circuit comprises a first dc voltage source and a full-bridge switch set, wherein the full-bridge switch set turns on a first switch set when the switch-mode circuit provides the first dc voltage in the specified time interval to enable the switch-mode circuit to output the first dc voltage, and turns on a second switch set when the switch-mode circuit provides the second dc voltage in the specified time interval to enable the switch-mode circuit to output the second dc voltage.
  5. 5. The switched mode electronic load of claim 1, wherein the switched mode circuit comprises a first dc voltage source and a second dc voltage source, the first dc voltage source providing the first dc voltage when the switched mode circuit provides the first dc voltage for the specified time period, and the second dc voltage source providing the second dc voltage when the switched mode circuit provides the second dc voltage for the specified time period.

Description

Switching electronic load Technical Field The present application relates to a switching electronic load, and more particularly, to a switching electronic load for testing a dc power supply. Background Conventionally, when detecting a dc power supply, an electronic load is often utilized to receive power provided by the dc power supply. Currently, one circuit architecture used by commonly used electronic loads is a linear circuit. Although the electronic load can have a faster response speed, the current can be rapidly pulled from the DC power supply. However, the electric energy provided by the dc power supply is consumed by the linear circuit in the form of heat energy, so that the electric energy cannot be recovered for reuse. In order to achieve the purpose of energy saving, some electronic loads begin to select a circuit architecture adopting a switching circuit, and the switching circuit is utilized to transmit electric energy provided by the direct current power supply back to the mains supply terminal. Although the electronic load (switching electronic load) using the switching circuit can have higher power recovery efficiency, the switching electronic load has a problem that the current cannot be pulled rapidly compared with the electronic load using the linear circuit structure because the current path includes the inductive component. Accordingly, there is a need for a switching electronic load that can rapidly pull current. Disclosure of Invention The application provides a switching type electronic load, which is provided with a switching type circuit capable of selectively providing positive direct current voltage or negative direct current voltage. Thus, the switching electronic load can rapidly pull the load current when the direct current power supply is tested. The application provides a switching type electronic load which is used for testing a direct current power supply. The switched electronic load includes a connection, a switched circuit, and an inductive component. The connecting end is used for being electrically connected with the output end of the direct-current power supply. The switching circuit selectively provides a first direct current voltage in a first voltage range or a second direct current voltage in a second voltage range according to the test command. The inductive component is electrically connected between the connecting end and the switching circuit. Wherein the first voltage range is not less than zero voltage and the second voltage range is less than zero voltage. The test command is related to the output voltage and the output current provided by the DC power supply, and the output voltage is positive voltage. In some embodiments, when the switching circuit determines that the test command indicates that the current change rate of the output current is not greater than the first threshold value in the specified time interval, the switching circuit provides the first dc voltage in the specified time interval. When the switching circuit judges that the current change rate of the output current in the appointed time interval is larger than the first threshold value according to the test command, the switching circuit provides a second direct current voltage in the appointed time interval. In some embodiments, the switching circuit includes a first dc voltage source and a full-bridge switch group, wherein when the switching circuit provides a first dc voltage in a specified time interval, the full-bridge switch group turns on the first switch group to enable the switching circuit to output the first dc voltage, and when the switching circuit provides a second dc voltage in a specified time interval, the full-bridge switch group turns on the second switch group to enable the switching circuit to output the second dc voltage. In some embodiments, the switching circuit includes a first dc voltage source and a second dc voltage source, the first dc voltage source providing the first dc voltage when the switching circuit provides the first dc voltage for a specified time period, and the second dc voltage source providing the second dc voltage when the switching circuit provides the second dc voltage for the specified time period. In summary, the voltage change of the switching circuit, which is different from the conventional switching electronic load, can only be changed between positive voltages, and the current cannot be pulled rapidly. In contrast, the switching circuit of the switching electronic load of the embodiment can be selectively switched into a direct-current negative voltage, so that the requirement of shorter and shorter rapid switching time in test can be met, and the purpose of rapidly pulling the load current is achieved. Other features and embodiments of the present application are described in detail below with reference to the following drawings. Drawings In order to more clearly illustrate the embodiments of the present application or the technical