US 10,651,727 B2Granted

Power supply control circuit, power supply device and electronic apparatus

AssigneeRohm Co., Ltd.

InventorYoshinori Imanaka

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Abstract

The present invention provides a power control circuit and a power device using the power control circuit, wherein quasi resonance is performed by the power control circuit using a coil, current flowing in the coil is monitored by a simple configuration, and a zero cross point or a bottom in resonance is detected. The present invention provides a power control circuit and a power device using the power control circuit. The power control circuit includes a detection circuit connected to a drain of MOSFET, the MOSFET serially connected between an inductor connected to an alternating-current wire and a current sensing resistor connected to ground potential; and a quasi resonance control circuit connected to the detection circuit and the MOSFET for performing quasi resonance control to inductor-current at a zero cross point or a bottom point in a time sequence of discharging while conducting the inductor-current of the inductor.

Claims36

Dependent claims

A power control circuit, comprising:

a high pass filter, connected to a drain of a MOSFET, wherein the MOSFET is serially connected between an inductor connected to an alternating-current wire and a current sensing resistor connected to a ground potential, and the high pass filter is arranged to generate a filtered output by blocking a direct current component of an inductor-current of the inductor;
and
a quasi resonance control circuit, connected to the high pass filter and the MOSFET,
wherein when the inductor-current of the inductor is conducted in a discharging time sequence, the quasi resonance control circuit performs quasi resonance control upon the inductor-current of the inductor at a zero crossing point or a bottom point in the discharging time sequence based on the filtered output of the high pass filter inputted to the quasi resonance control circuit;
wherein the high pass filter comprises:
a capacitor, connected to the drain;
and
a first resistor and a second resistor, connected between the capacitor and the ground potential in series;
and
wherein the quasi resonance control circuit comprises:
a current detection comparator, an inverting input terminal of the current detection comparator is connected to a connection point connecting the first resistor and the second resistor, and a reference voltage is input to an non-inverting input terminal of the current detection comparator;
a Zener diode, connected between the inverting input terminal of the current detection comparator and a ground terminal;
an error amplifier, connected to the current sensing resistor;
an RS trigger, a setting terminal of the RS trigger is connected to an output of the current detection comparator and a resetting terminal of the RS trigger is connected to an output of the error amplifier, and the RS trigger outputted a control signal of the MOSFET;
and
a buffer, connected to an output of the RS trigger, for driving the MOSFET.

13 more elements

A power device, comprising:

an inductor, connected to an alternating-current wire;
a current sensing resistor, connected to a ground potential;
a MOSFET, connected between the inductor and the current sensing resistor in series;
a high pass filter, connected to a drain of the MOSFET, wherein the high pass filter is arranged to generate a filtered output by blocking a direct current component of an inductor-current of the inductor;
and
a quasi resonance control circuit, connected to the high pass filter and the MOSFET,
wherein when the inductor-current of the inductor is conducted in a discharging time sequence, the quasi resonance control circuit performs quasi resonance control upon the inductor-current of the inductor at a zero crossing point or a bottom point in the discharging time sequence based on the filtered output of the high pass filter inputted to the quasi resonance control circuit;
wherein the high pass filter comprises:
a capacitor, connected to the drain;
and
a first resistor and a second resistor, connected between the capacitor and the ground potential in series;
and
wherein the quasi resonance control circuit comprises:
a current detection comparator, an inverting input terminal of the current detection comparator is connected to a connection point connecting the first resistor and the second resistor, and a reference voltage is input to an non-inverting input terminal of the current detection comparator;
a Zener diode, connected between the inverting input terminal of the current detection comparator and a ground terminal;
an error amplifier, connected to the current sensing resistor;
an RS trigger, a setting terminal of the RS trigger is connected to an output of the current detection comparator and a resetting terminal of the RS trigger is connected to an output of the error amplifier, and the RS trigger outputted a control signal of the MOSFET;
and
a buffer, connected to an output of the RS trigger, for driving the MOSFET.

16 more elements

A power control circuit, comprising:

a high pass filter, connected to a drain of a MOSFET, wherein the MOSFET is serially connected between an inductor connected to an alternating-current wire and a current sensing resistor connected to a ground potential, and the high pass filter is arranged to generate a filtered output by blocking a direct current component of an inductor-current of the inductor;
and
a quasi resonance control circuit, connected to the high pass filter and the MOSFET,
wherein when the inductor-current of the inductor is conducted in a discharging time sequence, the quasi resonance control circuit performs quasi resonance control upon the inductor-current of the inductor at a zero crossing point or a bottom point in the discharging time sequence based on the filtered output of the high pass filter inputted to the quasi resonance control circuit, wherein the zero crossing point or the bottom point is determined by the output of the high pass filter;
wherein the high pass filter comprises:
a capacitor, connected to the drain;
and
a first resistor and a second resistor, connected between the capacitor and the ground potential in series;
and
wherein the quasi resonance control circuit comprises:
a current detection comparator, an inverting input terminal of the current detection comparator is connected to a connection point connecting the first resistor and the second resistor, and a reference voltage is input to an non-inverting input terminal of the current detection comparator;
a Zener diode, connected between the inverting input terminal of the current detection comparator and a ground terminal;
an error amplifier, connected to the current sensing resistor;
an RS trigger, a setting terminal of the RS trigger is connected to an output of the current detection comparator and a resetting terminal of the RS trigger is connected to an output of the error amplifier, and the RS trigger outputted a control signal of the MOSFET;
and
a buffer, connected to an output of the RS trigger, for driving the MOSFET.

13 more elements

A power control circuit, comprising:

a high pass filter, connected to a drain of a MOSFET, wherein the MOSFET is serially connected between an inductor connected to an alternating-current wire and a current sensing resistor connected to a ground potential;
and
a quasi resonance control circuit, connected to the high pass filter and the MOSFET, wherein when an inductor-current of the inductor is conducted in a discharging time sequence, the quasi resonance control circuit performs quasi resonance control upon the inductor-current of the inductor at a zero crossing point or a bottom point in the discharging time sequence based on an output of the high pass filter,
wherein the high pass filter comprises:
a capacitor, connected to the drain;
and
a first resistor and a second resistor, connected between the capacitor and the ground potential in series;
and
wherein the quasi resonance control circuit comprises:
a current detection comparator, an inverting input terminal of the current detection comparator is connected to a connection point connecting the first resistor and the second resistor, and an reference voltage is input to an non-inverting input terminal of the current detection comparator;
a Zener diode, connected between the inverting input terminal of the current detection comparator and a ground terminal;
an error amplifier, connected to the current sensing resistor;
an RS trigger, a setting terminal of the RS trigger is connected to an output of the current detection comparator and a resetting terminal of the RS trigger is connected to an output of the error amplifier, and the RS trigger outputted a control signal of the MOSFET;
and
a buffer, connected to an output of the RS trigger, for driving the MOSFET.

12 more elements

A power device, comprising:

a regeneration capacitor, connected to an alternating-current wire;
an inductor, one end of the inductor connected to the regeneration capacitor;
a diode, connected between another end of the inductor and the alternating current wire;
a load, connected to the regeneration capacitor in parallel;
a current sensing resistor, connected to a ground potential;
a MOSFET, connected between another end of the inductor and the current sensing resistor in series;
a high pass filter, connected to a drain of the MOSFET;
and
a quasi resonance control circuit, connected to the high pass filter and the MOSFET, wherein when an inductor-current of the inductor is conducted in a discharging time sequence, the quasi resonance control circuit performs quasi resonance control upon the inductor-current of the inductor at a zero crossing point or a bottom point in the discharging time sequence based on an output of the high pass filter,
wherein the high pass filter comprises:
a capacitor, connected to the drain;
and
a first resistor and a second resistor, connected between the capacitor and the ground potential in series;
and
wherein the quasi resonance control circuit comprises:
a current detection comparator, an inverting input terminal of the current detection comparator is connected to a connection point connecting the first resistor and the second resistor, and an reference voltage is input to an non-inverting input terminal of the current detection comparator;
a Zener diode, connected between the inverting input terminal of the current detection comparator and a ground terminal;
an error amplifier, connected to the current sensing resistor;
an RS trigger, a setting terminal of the RS trigger is connected to an output of the current detection comparator and a resetting terminal of the RS trigger is connected to an output of the error amplifier, and the RS trigger outputted a control signal of the MOSFET;
and
a buffer, connected to an output of the RS trigger, for driving the MOSFET.

18 more elements

A power device, comprising:

a load, connected to an alternating-current wire;
an inductor, connected to the load in series;
a current sensing resistor, connected to a ground potential;
a MOSFET, connected between the inductor and the current sensing resistor in series;
a high pass filter, connected to a drain of the MOSFET;
and
a quasi resonance control circuit, connected to the high pass filter and the MOSFET, wherein when an inductor-current of the inductor is conducted in a discharging time sequence, the quasi resonance control circuit performs quasi resonance control upon the inductor-current of the inductor at a zero crossing point or a bottom point in the discharging time sequence based on an output of the high pass filter,
wherein the high pass filter comprises:
a capacitor, connected to the drain;
and
a first resistor and a second resistor, connected between the capacitor and the ground potential in series;
and
wherein the quasi resonance control circuit comprises:
a current detection comparator, an inverting input terminal of the current detection comparator is connected to a connection point connecting the first resistor and the second resistor, and an reference voltage is input to an non-inverting input terminal of the current detection comparator;
a Zener diode, connected between the inverting input terminal of the current detection comparator and a ground terminal;
an error amplifier, connected to the current sensing resistor;
an RS trigger, a setting terminal of the RS trigger is connected to an output of the current detection comparator and a resetting terminal of the RS trigger is connected to an output of the error amplifier, and the RS trigger outputted a control signal of the MOSFET;
and
a buffer, connected to an output of the RS trigger, for driving the MOSFET.

16 more elements

A power control circuit, comprising:

a high pass filter, connected to a drain of a MOSFET, wherein the MOSFET is serially connected between an inductor connected to an alternating-current wire and a current sensing resistor connected to a ground potential, and the high pass filter is arranged to generate an output by blocking a direct current component of an inductor-current of the inductor;
and
a quasi resonance control circuit, connected to the high pass filter and the MOSFET, wherein when the inductor-current of the inductor is conducted in a discharging time sequence, the quasi resonance control circuit performs quasi resonance control upon the inductor-current of the inductor at a zero crossing point or a bottom point in the discharging time sequence based on the filtered output of the high pass filter inputted to the quasi resonance control circuit, wherein the zero crossing point or the bottom point is determined by the output of the high pass filter;
wherein the high pass filter comprises:
a capacitor, connected to the drain;
and
a first resistor and a second resistor, connected between the capacitor and the ground potential in series;
and
wherein the quasi resonance control circuit comprises:
a current detection comparator, an inverting input terminal of the current detection comparator is connected to a connection point connecting the first resistor and the second resistor, and an reference voltage is input to an non-inverting input terminal of the current detection comparator;
a Zener diode, connected between the inverting input terminal of the current detection comparator and a ground terminal;
an error amplifier, connected to the current sensing resistor;
an RS trigger, a setting terminal of the RS trigger is connected to an output of the current detection comparator and a resetting terminal of the RS trigger is connected to an output of the error amplifier, and the RS trigger outputted a control signal of the MOSFET;
and
a buffer, connected to an output of the RS trigger, for driving the MOSFET.

12 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/548,856Filed 20 Nov 2014
Priority: JP 2013-24152122 Nov 2013
Published: US 2015/0171760 A118 Jun 2015
Granted: 12 May 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

H02M 1/4241
Arrangements for improving power factor of AC input: using a resonant converter
Y02B 70/10
Technologies for an efficient end-user side electric power management and consumption: technologies improving the efficiency by using…
H02M
Apparatus for conversion between ac and ac, between ac and dc, or
Y02B
Energy-efficient buildings