Parallel RC current detection circuit and DC/DC converter with a parallel RC current detection circuit

Claim 2

A circuit for detecting current flowing through an inductor, comprising: a first resistor which is connected in series with the inductor; a first circuit comprising a second resistor and a capacitor connected with each other in series and in parallel with the inductor and the first resistor; and a second circuit detecting current flowing through the inductor based on a voltage across the capacitor.

Claim 3

A DC/DC converter, comprising: a switch, to which DC input is applied, and which is turned on/off according to a control signal; an inductor connected to said switch; a circuit comprising a resistor and a first capacitor connected with each other in series with the resistor in parallel with a second capacitor and the resistor and first capacitor in parallel with the inductor; and a control unit generating a control signal to be provided to said switch based on a voltage across the first capacitor.

Claim 4

A DC/DC converter, comprising: a switch, to which DC input is applied, and which is turned on/off according to a control signal; an inductor connected to said switch; a circuit comprising a resistor and a first capacitor connected with each other in series with the resistor in parallel with a second capacitor and the resistor and first capacitor in parallel with the inductor; and a control unit generating a control signal to be provided to said switch based on a voltage across the first capacitor.

Claim 5

A switching voltage regulator comprising: an output terminal connected to a load; an output circuit including an inductor for storing energy and an output capacitor coupled to said output terminal which supplies a regulated voltage to said output terminal; a switching element coupled to said inductor so as to supply a current to said inductor in response to a switching control signal; a switching control circuit providing said switching control signal so as to maintain said regulated voltage to said output terminal; a first circuit monitoring an output voltage and generating a voltage feedback signal which indicates a target inductor current for regulating the output voltage; a second circuit comprising a series circuit of a resistor and a capacitor connected between both ends of said inductor, such that a voltage across said capacitor as a current feedback is generated, the second circuit further comprising an auxiliary resistor connected in series with the capacitor and generates voltage across the capacitor and the auxiliary resistor as a current feedback signal; and a third circuit providing said switching control signal in response to said voltage and current feedback signals.

Claim 6

A switching voltage regulator comprising: an output terminal connected to a load; an output circuit including an inductor for storing energy and an output capacitor coupled to said output terminal which supplies a regulated voltage to said output terminal; a switching element coupled to said inductor so as to supply a current to said inductor in response to a switching control signal; a switching control circuit providing said switching control signal so as to maintain said regulated voltage to said output terminal; a first circuit monitoring an output voltage and generating a voltage feedback signal which indicates a target inductor current for regulating the output voltage; a second circuit comprising a series circuit of a resistor and a capacitor connected between both ends of said inductor, such that a voltage across said capacitor as a current feedback is generated, the second circuit further comprising an auxiliary resistor connected in series with the capacitor and generates voltage across the capacitor and the auxiliary resistor as a current feedback signal; and a third circuit providing said switching control signal in response to said voltage and current feedback signals.

Claim 7

A switching voltage regulator comprising: an output terminal connected to a load; an output circuit including an inductor for storing energy and an output capacitor coupled to said output terminal which supplies a regulated voltage to said output terminal; a switching element coupled to said inductor so as to supply a current to said inductor in response to a switching control signal; a switching control circuit providing said switching control signal so as to maintain said regulated voltage to said output terminal; a first circuit monitoring an output voltage and generating a voltage feedback signal which indicates a target inductor current for regulating the output voltage; a second circuit comprising a series circuit of a resistor and a capacitor connected between both ends of said inductor, such that a voltage across said capacitor as a current feedback is generated, the second circuit further comprising an auxiliary capacitor connected in parallel with the resistor and generates voltage across the capacitor as a current feedback signal; and a third circuit providing said switching control signal in response to said voltage and current feedback signals.

Claim 8

A switching voltage regulator comprising: an output terminal connected to a load; an output circuit including an inductor for storing energy and an output capacitor coupled to said output terminal which supplies a regulated voltage to said output terminal; a switching element coupled to said inductor so as to supply a current to said inductor in response to a switching control signal; a switching control circuit providing said switching control signal so as to maintain said regulated voltage to said output terminal; a first circuit monitoring an output voltage and generating a voltage feedback signal which indicates a target inductor current for regulating the output voltage; a second circuit comprising a series circuit of a resistor and a capacitor connected between both ends of said inductor, such that a voltage across said capacitor as a current feedback is generated, the second circuit further comprising an auxiliary capacitor connected in parallel with the resistor and generates voltage across the capacitor as a current feedback signal; and a third circuit providing said switching control signal in response to said voltage and current feedback signals.

Claim 9

A switching voltage regulator comprising: an output terminal connected to a load; an output circuit including an inductor for storing energy and an auxiliary resistor connected in series with said inductor and an output capacitor coupled to said output terminal which supplies a regulated voltage to said output terminal; a switching element coupled to said inductor so as to supply a current to said inductor in response to a switching control signal; a switching control circuit providing said switching control signal so as to maintain said regulated voltage to said output terminal; a first circuit monitoring an output voltage and generating a voltage feedback signal which indicates a target inductor current for regulating the output voltage; a second circuit comprising a series circuit of a resistor and a capacitor connected in parallel with said inductor and the auxiliary resistor, such that a voltage across said capacitor as a current feedback is generated; and a third circuit providing said switching control signal in response to said voltage and current feedback signals.

Claim 10

A switching voltage regulator comprising: an output terminal connected to a load; an output circuit including an inductor for storing energy and an auxiliary resistor connected in series with said inductor and an output capacitor coupled to said output terminal which supplies a regulated voltage to said output terminal; a switching element coupled to said inductor so as to supply a current to said inductor in response to a switching control signal; a switching control circuit providing said switching control signal so as to maintain said regulated voltage to said output terminal; a first circuit monitoring an output voltage and generating a voltage feedback signal which indicates a target inductor current for regulating the output voltage; a second circuit comprising a series circuit of a resistor and a capacitor connected in parallel with said inductor and the auxiliary resistor, such that a voltage across said capacitor as a current feedback is generated; and a third circuit providing said switching control signal in response to said voltage and current feedback signals.