Bidirectional current detection circuit

Abstract

The invention provides a bidirectional current detection circuit. The bidirectional current detection circuit is that a circuit at the output side of a current inductor is characterized in that a first pin (1) of the output end of a current inductor T2 is sequentially connected to a second pin (2) through a divider resistor R1 and a divider resistor R2; two one-way connection branches with sampling resistors are provided; the first one-way connection branch is connected in parallel with the divider resistor R1, and while the second one-way connection branch is connected in parallel with the divider resistor R2; the two one-way connection branches are in opposite connection ways; the potentials of potential points (V1, V2) in the circuit at the output side of the current inductor T2 change as the output current direction of the current inductor T2 changes; the potentials of the potential points (V1, V2) are converted into voltage which can be input through a control chip circuit by a direction recognizing voltage conversion circuit, and thus the current direction of the control chip circuit can be recognized without modulating; sampling voltage of sampling resistors in the two one-way connection branches is output with the same polarity through a sampling voltage output circuit and then the control chip circuit can detect the current.

Description

technical field [0001] The invention relates to a bidirectional current detection circuit. Background technique [0002] Bidirectional power converters can realize bidirectional transfer of energy, and are widely used in UPS power supplies, electric vehicles and other fields. The current needs to be sampled in the energy conversion control. Since the direction of electric energy transmission is different, the direction of the current will be different. The selected current detection device must be able to detect both positive current and negative current, and can also convert the sampled current signal into a voltage. signal, the current detection device is required to detect both positive voltage and negative voltage, but most control chips generally do not have the ability to accept positive and negative voltages, so a conditioning circuit is required to shift the voltage. This increases the cost and complexity of the circuit on the one hand, and reduces the sampling accu...

AI Technical Summary

Problems solved by technology

The current needs to be sampled in the energy conversion control. Since the direction of electric energy transmission is different, the direction of the current will be different. The selected current detection device must be able to detect both positive current and negative current, and can also convert the sampled current signal into a voltage. signal, the current detection device is required to detect both positive voltage and negative voltage, but most control chips generally do not have the ability to accept positive and negative voltages, so a conditioning circuit is required to shift the voltage. On the one hand, this increases the cost and complexity of the circuit, on the other hand, it reduces the sampling accuracy

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