Control device of direct current circuit breaker

The invention belongs to the field of direct-current circuit breaker control, and particularly relates to a control device of a direct-current circuit breaker. The digital quantity input modules corresponding to the digital quantity input interfaces are integrally arranged on the expansion board instead of the core board, so that the voltage level and the corresponding number of the digital quantity input interfaces can be flexibly adjusted by transforming or replacing the expansion board, the core board does not need to be transformed or a redundant circuit does not need to be arranged, and the application cost is effectively reduced; the core board and the expansion board are connected back to back, so that the size of the device can be reduced; meanwhile, heat dissipation is facilitated, and a certain supporting effect is achieved; the expansion board is simple in design and plug-and-play, so that the debugging time cost is reduced; a single FPGA is adopted as a main control module for fault judgment, corr