DC-DC high frequency boost converter

1. A DC-DC high frequency boost converter, comprising:

a supply voltage input ( 110 ):

a boosted voltage output ( 112 );

a series circuit of an inductor ( 114 ) and a rectifying device ( 116 ) connected in series between said supply voltage input ( 110 ) and said boosted voltage output ( 112 );

a switch ( 124 ) connected between a connection node ( 120 ) of said inductor ( 114 ) and said rectifying device ( 116 ) and ground;

a control circuit ( 126 ) for controlling said switch ( 124 ); and

a zero inductor current detection circuit ( 128 ) that compares a voltage (On) on said connection node ( 120 ) with a reference voltage (U ref ) and provides a zero inductor current indication (Comp) when both voltages are equal;

wherein the zero current detection circuit ( 128 ) comprises a comparator ( 132 ) with a first input connected to said connection node ( 120 ) trough a sampling switch ( 146 ), a second input connected to a reference voltage source ( 134 ) and an output connected to a control input of said control circuit ( 126 ).

2. The converter according to claim 1 , wherein a sampling capacitor ( 144 ) is connected to the first input of the comparator ( 132 ).

3. The converter according to claim 1 , wherein the reference voltage source ( 134 ) comprises a current source ( 132 ) connected in series with a resistor ( 140 ) between said supply voltage input ( 110 ) and ground.

4. The converter according to claim 2 , wherein the reference voltage (U ref ) is selected to compensate for the charging time of the sampling capacitor ( 144 ).

5. The converter according to claim 4 , wherein the reference voltage (U ref ) is on the order of a few mV.