H power bidirectional current detection circuit

When the input signal ∥-~ from the H-bridge schematic circuit (see Figure 5-33) is low level, switches
S, and S. conduction, winding current,. is forward and flows through the current detection resistor R. }When ∥,.
When it is high level, s. and s. On, "Rs flows in reverse direction. The current feedback signal is generated by
operational amplifier A. Take Rs=Rs,=Rs., amplifier A. The output voltage
    Ve=Vos ten nIMRS
    Vos is the output when -o , in A. When the power supply Vc:c-15V, take Vo. -
Vo:/2-7.5V, n-5, Rs-O.in' and get
    Vc-7.5+0.51M
when the current is from +6A to 6A When changing, the Ve voltage change is +10. 5-
+4. 5V.