The invention relates to a bidirectional sensor circuit for measuring currents in circuits for which there is no reference at the same ground level, which comprises: a sensing impedance with a first terminal and a second terminal； a first operational amplifier of which the non-inverting input is connected to the first terminal and the inverting input is connected to the second terminal； a second operational amplifier with the non-inverting input connected to the second terminal and the inverting input connected to the first terminal； a first diode with the anode connected to the inverting input of the first operational amplifier, the cathode of which connects to the output of the first operational amplifier； a second diode with the anode connected to the output of the first operational amplifier and to the cathode of the first diode； a variable impedance connected to the anode of the first diode and to the cathode of the second diode； a fourth diode with the cathode connected to the cathode of the second diode and to one end of the variable impedance； a third diode with the anode connected to the inverting input of the second operational amplifier and the cathode to the output of the second operational amplifier and to the anode of the fourth diode； a variable impedance connected to the cathode of the fourth diode and to the anode of the third diode； wherein the input of the bidirectional sensor circuit consists of the terminals of the sensing impedance, and the output is in the anode of the second diode and senses the current that flows through a load impedance connected to the first terminal of the sensing impedance.Un circuito sensor bidireccional para la medición de corrientes en circuitos no se tengan referencia a un mismo nivel de tierra, que comprende: una impedancia de sensado con un primer terminal y un segundo terminal； un primer amplificador operacional cuya entrada no inversora está conectada a la primera terminal y su entrada inversora está conectada al
