How to define a switching Converter ? about oemof-solph HOT 7 OPEN

heat_pump = solph.components.Converter(
    "heat pump",
    inputs={b_electricity: solph.Flow()},
    outputs={
        b_heat: solph.Flow(min=1, nonconvex=solph.NonConvex(), nominal_value=10),  # e.g. 10 kW heat
    },
    conversion_factors={b_heat: COP}
)

        energysystem = solph.EnergySystem(timeindex=times)
        
        bel = solph.buses.Bus(label='electricity')
        b_heat = solph.buses.Bus(label='heat')
        
        
        # create source object representing the e commodity
        energysystem.add(
                solph.components.Source(
                label="e-in",
                outputs={
                bel: solph.flows.Flow(variable_costs=50)
                },
            )
        )
        
        # create storage object for heat
        nominal_capacity = 4000
        nominal_value = 400

        heat_storage = solph.components.GenericStorage(
            nominal_storage_capacity=nominal_capacity,
            label="STORAGE_HEAT",
            inputs={b_heat: solph.flows.Flow(nominal_value=nominal_value, variable_costs=0.001)},
            outputs={
                b_heat: solph.flows.Flow(
                    nominal_value=nominal_value, variable_costs=0.001
                )
            },
            loss_rate=0.00,
            initial_storage_level=0.5,
            inflow_conversion_factor=1,
            outflow_conversion_factor=1,
        )

        energysystem.add(heat_storage)
        
        sink = solph.components.Sink(
            label="demand_th",
            inputs={b_heat: solph.Flow(nominal_value=200, fix=1)}
        )
        
        energysystem.add(solph.components.Converter(label="heatPump",
           inputs={bel: solph.flows.Flow(
           )},
           outputs={b_heat: solph.flows.Flow(nominal_value=400,
           nonconvex=solph.NonConvex(),
           min=1,
           )},
           conversion_factors={b_heat: 1}
           ))
        
        energysystem.add(bel, b_heat, sink)
        
        
        # solve problem
        om = solph.Model(energysystem)
        om.solve(solver="cbc", solve_kwargs={"tee": True})

 today = datetime.date.today()
 start_day = today - datetime.timedelta(days=1)
 times = pd.date_range(start=start_day, end=today, freq='5T')

energysystem.add(
    solph.components.Sink(
        label="excess_bus_heat",
        inputs={b_heat: solph.flows.Flow(variable_costs=100)},
    )
)