US5408401A — Power source circuit with a compact size and oper…

Claim 1

Independent Claim 117 words

A power source circuit for converting direct current (DC) power into alternating current (AC) power having a required frequency and providing DC output power according to the AC power for use upon a change of ambient temperature, comprising: oscillation means for providing a control signal that determines a converting frequency of the AC power; sensing means for said oscillation means, having temperature characteristics for increasing the converting frequency upon changing of ambient temperature; determination means for determining the converting frequency of the AC power based on said control signal provided by said oscillation means; a transformer coupled to said determination means; and DC output detection means, including a temperature sensor, for temperature-dependently detecting the DC output power.

Claim 2

Dependent Claim 117 words

A power source circuit for converting direct current (DC) power into alternating current (AC) power having a required frequency and providing DC output power according to the AC power for use upon a change of ambient temperature, comprising: oscillation means for providing a control signal that determines a converting frequency of the AC power; sensing means for said oscillation means, having temperature characteristics for increasing the converting frequency upon changing of ambient temperature; determination means for determining the converting frequency of the AC power based on said control signal provided by said oscillation means; a transformer coupled to said determination means; and DC output detection means, including a temperature sensor, for temperature-dependently detecting the DC output power.

Claim 3

Dependent Claim 16 words

The power source circuit according to claim 1, wherein said sensing means involves a temperature sensor.

Claim 4

Dependent Claim 31 words

The power source circuit according to claim 2 wherein the temperature sensor is a platinum temperature detecting resistor so that the converting frequency is continually raised as the ambient temperature drops.

Claim 5

Dependent Claim 32 words

The power source circuit according to claim 2 wherein the temperature sensor is a PTC thermistor having switching characteristics for changing the converting frequency when the temperature falls below a predetermined value.

Claim 6

Dependent Claim 31 words

The power source circuit according to claim 1, wherein said determination means determines the converting frequency of the AC power according to a value detected by the DC output detection means.

Claim 7

Dependent Claim 27 words

The power source circuit according to claim 1, wherein said determination means includes a pulse-width modulation (PWM) controller, maximizing DC output power when said converting frequency increases.

Claim 8

Dependent Claim 19 words

The power source circuit according to claim 1, wherein the sensing means is activated responsive to positive temperature characteristics.

Claim 9

Dependent Claim 19 words

The power source circuit according to claim 1, wherein the sensing means is activated responsive to negative temperature characteristics.

Claim 10

Dependent Claim 98 words

A driving circuit for driving a motor for use upon a change of ambient temperature, comprising: oscillation means for providing a control signal that determines a converting frequency of AC power; sensing means provided for said oscillation means, having temperature characteristics for adjusting the converting frequency upon a change of ambient temperature; determination means for determining the converting frequency of the AC power based on the control signal provided by said oscillation means; a transformer coupled to said determination means; and means connected to a secondary winding of said transformer for providing DC output power to said motor.

Claim 11

Dependent Claim 98 words

A driving circuit for driving a motor for use upon a change of ambient temperature, comprising: oscillation means for providing a control signal that determines a converting frequency of AC power; sensing means provided for said oscillation means, having temperature characteristics for adjusting the converting frequency upon a change of ambient temperature; determination means for determining the converting frequency of the AC power based on the control signal provided by said oscillation means; a transformer coupled to said determination means; and means connected to a secondary winding of said transformer for providing DC output power to said motor.

Claim 12

Dependent Claim 15 words

The driving circuit according to claim 9, wherein said sensing means involves a temperature sensor.

Claim 13

Dependent Claim 48 words

The driving circuit according to claim 9, further comprising: DC output detection means, including a temperature sensor, for temperature-dependently detecting the DC output power, and wherein said determination means determines the converting frequency of the AC power according to a value detected by the DC output detection means.

Claim 14

Dependent Claim 26 words

The driving circuit according to claim 9, wherein said determination means includes a pulse-width modulation (PWM) controller, maximizing DC output power when said converting frequency increases.

Claim 15

Dependent Claim 98 words

A power source circuit for driving a load having temperature dependency with power supplied through power transformer means and limiting the power supplied to the load according to detected values, comprising: output current detection means for temperature-dependently detecting an output current supplied to the load; output voltage detection means for temperature-dependently detecting an output voltage supplied to the load; input current detection means for temperature-dependently detecting an input current supplied to the power source circuit; and limit means for limiting the power supplied to the load according to values detected by at least two of said detection means.

Claim 16

Dependent Claim 98 words

A power source circuit for driving a load having temperature dependency with power supplied through power transformer means and limiting the power supplied to the load according to detected values, comprising: output current detection means for temperature-dependently detecting an output current supplied to the load; output voltage detection means for temperature-dependently detecting an output voltage supplied to the load; input current detection means for temperature-dependently detecting an input current supplied to the power source circuit; and limit means for limiting the power supplied to the load according to values detected by at least two of said detection means.

Claim 17

Independent Claim 172 words

A method in a DC power source circuit for providing an output power signal with characteristics that follow the temperature characteristics of a load, comprising the steps of: providing a control signal from an oscillator circuit that determines a converting frequency to convert a DC signal to an AC signal according to temperature; sensing the temperature with a temperature sensor in the oscillator circuit; adjusting the converting frequency according to the sensed temperature; sensing an output current according to temperature in a current sensing circuit, the current sensing circuit including a temperature sensor, and providing a sensed current control signal; sensing an output voltage according to temperature in a voltage sensing circuit, the voltage sensing circuit including a temperature sensor, and providing a sensed voltage control signal; determining the converting frequency of the AC power according to the voltage and current control signals provided to a pulse width modulator circuit; and outputting the output power signal according to the frequency of the AC power that follows the temperature characteristics of the load.

Claim 18

Independent Claim 172 words

A method in a DC power source circuit for providing an output power signal with characteristics that follow the temperature characteristics of a load, comprising the steps of: providing a control signal from an oscillator circuit that determines a converting frequency to convert a DC signal to an AC signal according to temperature; sensing the temperature with a temperature sensor in the oscillator circuit; adjusting the converting frequency according to the sensed temperature; sensing an output current according to temperature in a current sensing circuit, the current sensing circuit including a temperature sensor, and providing a sensed current control signal; sensing an output voltage according to temperature in a voltage sensing circuit, the voltage sensing circuit including a temperature sensor, and providing a sensed voltage control signal; determining the converting frequency of the AC power according to the voltage and current control signals provided to a pulse width modulator circuit; and outputting the output power signal according to the frequency of the AC power that follows the temperature characteristics of the load.

Claim 19

Dependent Claim 74 words

A power source circuit for driving a load having temperature dependency and limiting power supplied to the load according to a detected value, comprising: output current detection means for temperature-dependently detecting an output current supplied to the load, said output current detection means including a thermistor having nonlinear positive temperature characteristics; and limit means for limiting the power supplied to said load according to said output current detected by said output current detection means.

Claim 20

Dependent Claim 74 words

A power source circuit for driving a load having temperature dependency and limiting power supplied to the load according to a detected value, comprising: output current detection means for temperature-dependently detecting an output current supplied to the load, said output current detection means including a thermistor having nonlinear positive temperature characteristics; and limit means for limiting the power supplied to said load according to said output current detected by said output current detection means.

Claim 21

Dependent Claim 74 words

A power source circuit for driving a load having temperature dependency and limiting power supplied to the load according to a detected value, comprising: output voltage detection means for temperature-dependently detecting an output voltage supplied to the load, said output voltage detection means including a thermistor having nonlinear negative temperature characteristics; and limit means for limiting the power supplied to said load according to said output voltage detected by said output voltage detection means.

Claim 22

Dependent Claim 74 words

A power source circuit for driving a load having temperature dependency and limiting power supplied to the load according to a detected value, comprising: output voltage detection means for temperature-dependently detecting an output voltage supplied to the load, said output voltage detection means including a thermistor having nonlinear negative temperature characteristics; and limit means for limiting the power supplied to said load according to said output voltage detected by said output voltage detection means.

Claim 23

Dependent Claim 157 words

A power source circuit for supplying DC power to a load comprising: a rectifying circuit receiving an input alternating current (AC) signal and outputting a direct current (DC) signal; a converter transformer, to which said DC signal is applied, for converting said DC signal applied to said converter transformer into an AC signal according to a frequency at which said applied DC power is switched ON and OFF; a control circuit including an oscillation circuit and a pulse width modulation (PWM) controller providing a control signal to switch ON and OFF said DC power applied to said transformer thereby controlling a converting frequency of said AC power; means for detecting a change in ambient temperature and for providing said control circuit an indication of said change, said control circuit thereby adjusting said converting frequency according to said change; and means connected to a secondary winding of said converter transformer for providing DC output power to said load.

Claim 24

Dependent Claim 157 words

A power source circuit for supplying DC power to a load comprising: a rectifying circuit receiving an input alternating current (AC) signal and outputting a direct current (DC) signal; a converter transformer, to which said DC signal is applied, for converting said DC signal applied to said converter transformer into an AC signal according to a frequency at which said applied DC power is switched ON and OFF; a control circuit including an oscillation circuit and a pulse width modulation (PWM) controller providing a control signal to switch ON and OFF said DC power applied to said transformer thereby controlling a converting frequency of said AC power; means for detecting a change in ambient temperature and for providing said control circuit an indication of said change, said control circuit thereby adjusting said converting frequency according to said change; and means connected to a secondary winding of said converter transformer for providing DC output power to said load.

Claim 25

Dependent Claim 41 words

A power source circuit as recited in claim 17, further comprising: DC output detection means, including a temperature sensor, for temperature-dependently detecting said DC output power and providing a signal to said control circuit indicating said temperature-dependently detected DC output power.

Claim 26

Dependent Claim 34 words

A power source circuit as recited in claim 17, wherein said detecting means includes sensing means for said oscillation circuit, having temperature characteristics for increasing the converting frequency upon a decrease of ambient temperature.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1998-04-17	1998-10-17	1999-04-18	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2002-04-17	2002-10-17	2003-04-18	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2006-04-17	2006-10-17	2007-04-18	$7700.00	Window Closed / Lapsed

Power source circuit with a compact size and operating efficiently at low temperature

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