Source-load hybrid low-voltage large-current direct-current constant-current source system

Abstract

The invention relates to a source-load hybrid low-voltage large-current direct-current constant-current source system. The source-load hybrid low-voltage large-current direct-current constant-current source system comprises a DAC conversion circuit, an electronic load circuit, an ADC front-end buffer circuit, a circuit for converting a high-power power supply into a plurality of low-power standard power supplies, and a plurality of low-power constant-current sources PS arranged in parallel; each low-power constant-current source PS is connected with a power resistor R corresponding to the low-power constant-current source PS in series; each low-power constant-current source is provided with a high-speed MOS switch, and the high-speed MOS switches control on-off of a corresponding line; the system further comprises a plurality of direct-current power supplies PSM connected with the small-power constant-current sources PS in parallel; each direct-current power supply PSM is further connected with a corresponding controllable electronic load RM; the small-power constant-current sources are independently connected to a bus of VOUT+ and a bus of VOUT-in parallel; and a real-time feedback closed-loop control system is arranged on the buses.. According to the system, the high-power power supply can be converted into the plurality of low-power standard power supplies, and therefore, a manufacturing process requirement is lowered, and the project cost and the maintenance cost are reduced.

Description

technical field [0001] The invention relates to a direct-current constant-current source system, in particular to a source-carrying hybrid low-voltage and high-current direct-current constant-current source system. Background technique [0002] The existing low-voltage high-current constant-current source technology is difficult to overcome the out-of-control caused by the skin inductance generated on the circuit when the current changes sharply, so it is adjusted to the target current by slowly rising and falling the current, generally 1000A It takes at least 100ms for the above current to reach the target value, and the cost is high, and the design process is complicated. Such a technology cannot meet the needs of high-speed response of the current. For example, the instantaneous test of the circuit breaker requires the line current to reach the target value within 10ms at most. . [0003] At the same time, the existing foreign advanced low-voltage high-current constant-c...

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Problems solved by technology

[0002] The existing low-voltage high-current constant-current source technology is difficult to overcome the out-of-control caused by the skin inductance generated on the circuit when the current changes sharply, so it is adjusted to the target current by slowly rising and falling the current, generally 1000A It takes at least 100ms for the above current to reach the target value, and the cost is high, and the design process is complicated. Such a technology cannot meet the needs of high-speed response of the current. For example, the instantaneous test of the circuit breaker requires the line current to reach the target value within 10ms at most.

[0003] At the same time, the existing foreign advanced low-voltage high-current constant-current source technology, the response time at 5V / 15000A output is about 40ms, and the response is slow

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