A control device for overcurrent protection for a voltage converter, comprising: a first control module configured to obtain a current reference value according to an output voltage of the voltage converter and a given voltage value; a current modulation module configured to reduce the current reference value when an absolute value of an output current of the voltage converter is greater than an absolute value of a first current threshold, wherein the current modulation module comprises: a first comparator unit comprising a first comparator subsystem, CMPSS, that is configured to obtain the output current and the first current threshold, and to output a first signal when the absolute value of the output current is greater than the absolute value of the first current threshold, wherein the CMPSS is a component of a digital signal processing, DSP, chip, and a current modulation unit configured to reduce the current reference value in response to the first signal, characterized in that the current modulation unit comprises: a processing subunit configured to determine a current down-regulation value in response to the first signal, the current down-regulation value being a fixed value, and a current modulation subunit configured to reduce the current reference value by the current down-regulation value to obtain the reduced current reference value; and the control device comprises a second control module configured to control the output current of the voltage converter according to the reduced current reference value and the output current. a first control module configured to obtain a current reference value according to an output voltage of the voltage converter and a given voltage value; a current modulation module configured to reduce the current reference value when an absolute value of an output current of the voltage converter is greater than an absolute value of a first current threshold, wherein the current modulation module comprises: a first comparator unit comprising a first comparator subsystem, CMPSS, that is configured to obtain the output current and the first current threshold, and to output a first signal when the absolute value of the output current is greater than the absolute value of the first current threshold, wherein the CMPSS is a component of a digital signal processing, DSP, chip, and a current modulation unit configured to reduce the current reference value in response to the first signal, characterized in that the current modulation unit comprises: a processing subunit configured to determine a current down-regulation value in response to the first signal, the current down-regulation value being a fixed value, and a current modulation subunit configured to reduce the current reference value by the current down-regulation value to obtain the reduced current reference value; and the control device comprises a first comparator unit comprising a first comparator subsystem, CMPSS, that is configured to obtain the output current and the first current threshold, and to output a first signal when the absolute value of the output current is greater than the absolute value of the first current threshold, wherein the CMPSS is a component of a digital signal processing, DSP, chip, and a current modulation unit configured to reduce the current reference value in response to the first signal, characterized in that the current modulation unit comprises: a processing subunit configured to determine a current down-regulation value in response to the first signal, the current down-regulation value being a fixed value, and a current modulation subunit configured to reduce the current reference value by the current down-regulation value to obtain the reduced current reference value; and the control device comprises a processing subunit configured to determine a current down-regulation value in response to the first signal, the current down-regulation value being a fixed value, and a current modulation subunit configured to reduce the current reference value by the current down-regulation value to obtain the reduced current reference value; and the control device comprises a second control module configured to control the output current of the voltage converter according to the reduced current reference value and the output current.