Power source device

Patent metadata

Field	Value
Publication number	US-12224677-B2
Application number	US-202118265691-A
Country	US
Kind code	B2
Filing date	Jan 27, 2021
Priority date	Jan 27, 2021
Publication date	Feb 11, 2025
Grant date	Feb 11, 2025

Abstract

A power source device includes a capacitive load; and an AC power source, as a voltage source, which applies AC voltage to the capacitive load. A series circuit composed of an inductor and a capacitor is connected to the AC power source. A series circuit composed of a load inductor and the capacitive load is connected in parallel to one of the inductor or the capacitor. If an inductance of the inductor is defined as Lp, a capacitance of the capacitor is defined as Cp, an inductance of the load inductor is defined as Ls, an equivalent capacitance of the capacitive load is defined as Cs, and a frequency of the AC power source is defined as fv, the following expressions are satisfied,

0.8/((2π· fv ){circumflex over ( )}2)< Lp·Cp <1.2/((2π· fv ){circumflex over ( )}2)

0.8/((2π· fv ){circumflex over ( )}2)< Ls·Cs <1.2/((2π· fv ){circumflex over ( )}2).

First claim

The invention claimed is:

1. A power source device comprising: a capacitive load having an equivalent capacitor and an equivalent resistor; and an AC power source which applies AC voltage to the capacitive load, the power source device being such that a series circuit composed of a first inductor and a first capacitor is connected to the AC power source, and a series circuit composed of a load inductor and the capacitive load is connected in parallel to one of the first inductor or the first capacitor, or a parallel circuit composed of the first inductor and the first capacitor is connected to the AC power source, and a parallel circuit composed of the load inductor and the capacitive load is connected in series to one of the first inductor or the first capacitor, wherein the power source device has a configuration wherein an inductance of the first inductor is defined as Lp, a capacitance of the first capacitor is defined as Cp, an inductance of the load inductor is defined as Ls, an equivalent capacitance of the capacitive load is defined as Cs, and a frequency of the AC power source is defined as fv, and the following first expression and second expression are satisfied,
0.8/((2π· fv ){circumflex over ( )}2)< Lp·Cp< 1.2/((2π· fv ){circumflex over ( )}2)

0.8/(2π· fv ){circumflex over ( )}2)< Ls·Cs< 1.2/(2π· fv ){circumflex over ( )}2).

2. The power source device according to claim 1 , further comprising: an adjustment mechanism which makes variable at least one inductance or capacitance among the inductance of the first inductor, the capacitance of the first capacitor, and the inductance of the load inductor.

3. The power source device according to claim 1 , further comprising:
a control circuit which controls the frequency of the AC power source; and
one of
a detection circuit which detects one or both of a voltage and a current of the capacitive load, or
a detection circuit which detects an output voltage and an output current of the AC power source, wherein

in a case of the former detection circuit, the frequency of the AC power source is controlled such that a value of one of the voltage or the current is maximized, and,
in a case of the latter detection circuit, the frequency of the AC power source is controlled such that a phase difference between the output voltage and the output current is minimized.

4. The power source device according to claim 1 , further comprising: a control circuit which controls the frequency of the AC power source; and a storage to store therein a relationship between an operation condition of the capacitive load and an optimum value of the frequency of the AC power source, wherein upon start of operation of the power source device or upon change in the operation condition, the frequency of the AC power source is set to the optimum value according to the operation condition.

5. A power source device comprising: an inductive load having an equivalent inductor and an equivalent resistor; and an AC power source which applies AC voltage to the inductive load, the power source device being such that a parallel circuit composed of a first inductor and a first capacitor is connected to the AC power source, and a parallel circuit composed of a load capacitor and the inductive load is connected in series to one of the first inductor or the first capacitor, or a series circuit composed of the first inductor and the first capacitor is connected to the AC power source, and a series circuit composed of the load capacitor and the inductive load is connected in parallel to one of the first inductor or the first capacitor, wherein the power source device has a configuration wherein an inductance of the first inductor is defined as Lp, a capacitance of the first capacitor is defined as Cp, a capacitance of the load capacitor is defined as Cs, an inductance of the inductive load is defined as Ls, and a frequency of the AC power source is defined as fv, and the following first expression and second expression are satisfied,
0.8/((2π· fv ){circumflex over ( )}2)< Lp·Cp< 1.2/((2π· fv ){circumflex over ( )}2)

0.8/((2π· fv ){circumflex over ( )}2)< Ls·Cs< 1.2/((2π· fv ){circumflex over ( )}2).

6. The power source device according to claim 5 , further comprising:
a control circuit which controls the frequency of the AC power source; and
one of
a detection circuit which detects one or both of a voltage or a current of the inductive load, or
a detection circuit which detects an output voltage and an output current of the AC power source, wherein

in a case of the former detection circuit, the frequency of the AC power source is controlled such that a value of one of the voltage or the current is maximized, and,
in a case of the latter detection circuit, the frequency of the AC power source is controlled such that a phase difference between the output voltage and the output current is minimized.

7. The power source device according to claim 5 , further comprising: a control circuit which controls the frequency of the AC power source; and a storage to store therein a relationship between an operation condition of the inductive load and an optimum value of the frequency of the AC power source, wherein upon start of operation of the power source device or upon change in the operation condition, the frequency of the AC power source is set to the optimum value according to the operation condition.

8. The power source device according to claim 5 , further comprising: an adjustment mechanism which makes variable at least one inductance or capacitance among the inductance of the first inductor, the capacitance of the first capacitor, and the capacitance of the load capacitor.

9. A power source device comprising: a capacitive load having an equivalent capacitor and an equivalent resistor; and an AC power source which applies AC voltage to the capacitive load, a series circuit composed of a first inductor and a first capacitor being connected to the AC power source, with “n” being an integer not smaller than 2, a series circuit composed of an n-th inductor and an n-th capacitor being connected in parallel to one of an (n−1)-th inductor or an (n−1)-th capacitor, and a series circuit composed of a load inductor and the capacitive load being connected in parallel to one of the n-th inductor or the n-th capacitor, wherein the power source device has a configuration in which a resonance frequency of the first inductor and the first capacitor, a resonance frequency of a second inductor and a second capacitor, a resonance frequency of the n-th inductor and the n-th capacitor, and a resonance frequency of the load inductor and the capacitive load equal each other, and a frequency of the AC power source matches each of the resonance frequencies.

Assignees

• Mitsubishi Electric Corp

Inventors

• Tamida Taichiro
• Tsuda Shingo
• Takauchi Daisuke
• Kumagai Takashi

Classifications

• H02M7/539

  with automatic control of output wave form or frequency (H02M7/5375 - H02M7/5387 take precedence) · CPC title

• H02J3/00

  Circuit arrangements for AC mains or AC distribution networks · CPC title

• H02M7/5387

  in a bridge configuration · CPC title

• H02M7/4818 Primary

  with means for adaptation of resonance frequency, e.g. by modification of capacitance or inductance of resonance circuits · CPC title

• H02M5/06

  using impedances · CPC title