Power supply device, lighting equipment, and method for manufacturing power supply device

Patent metadata

Field	Value
Publication number	US-10869374-B2
Application number	US-201716462777-A
Country	US
Kind code	B2
Filing date	Nov 17, 2017
Priority date	Dec 2, 2016
Publication date	Dec 15, 2020
Grant date	Dec 15, 2020

Abstract

An input connection part having a first connection part and a second connection part, an anti-surge circuit having a first varistor and a second varistor which are connected in series so as to connect the first connection part and the second connection part, and a lightning arrester device connecting a connection point of the first varistor and the second varistor and a grounding connection part, and a power supply circuit connected to the anti-surge circuit are provided, wherein capacitances of the first varistor and the second varistor are any values from a value of 1.6 times a nominal capacitance of the first varistor and the second varistor to a value of 0.4 times the nominal capacitance.

First claim

The invention claimed is:

1. A power supply device comprising:
an input connection part having a first connection part and a second connection part;
an anti-surge circuit having a first varistor and a second varistor which are connected in series so as to connect the first connection part and the second connection part, and a lightning arrester device connecting a connection point of the first varistor and the second varistor and a grounding connection part; and
a power supply circuit connected to the anti-surge circuit, wherein a maximum voltage (VzMAX) at which the first varistor or the second varistor maintains a high resistance is such that VzMAX≥Vac×[(1+α)/2],
wherein Vac is a voltage of an AC power supply applied to the input connection part, and α equals a dispersion of capacitance values of the first varistor and the second varistor such that C 1 =C(1+α) and C 2 =C(1−α) such that the first varistor and the second varistor have capacitance values (C 1 and C 2 , respectively) between 1.6 times a nominal capacitance (C) of the first varistor and the second varistor and 0.4 times the nominal capacitance (C).

2. The power supply device according to claim 1 , wherein an allowable voltage of the first varistor and the second varistor is smaller than a voltage input to the first connection part and the second connection part.

3. The power supply device according to claim 2 , wherein a withstand voltage of the power supply circuit is set to be larger than a value of 1.6 times the voltage applied to the input connection part.

4. The power supply device according to claim 3 , wherein the lightning arrester device is an arrester, a capacitor or a parallel circuit of an arrester and a capacitor.

5. The power supply device according to claim 2 , wherein the lightning arrester device is an arrester, a capacitor or a parallel circuit of an arrester and a capacitor.

6. The power supply device according to claim 1 , wherein a withstand voltage of the power supply circuit is set to be larger than a value of 1.6 times the voltage applied to the input connection part.

7. The power supply device according to claim 6 , wherein the lightning arrester device is an arrester, a capacitor or a parallel circuit of an arrester and a capacitor.

8. The power supply device according to claim 1 , wherein the lightning arrester device is an arrester, a capacitor or a parallel circuit of an arrester and a capacitor.

9. A lighting equipment comprising:
a power supply device comprising an input connection part having a first connection part and a second connection part, an anti-surge circuit having a first varistor and a second varistor which are connected in series so as to connect the first connection part and the second connection part, and a lightning arrester device connecting a connection point of the first varistor and the second varistor and a grounding connection part, and a power supply circuit connected to the anti-surge circuit, wherein a maximum voltage (VzMAX) at which the first varistor or the second varistor maintains a high resistance is such that VzMAX≥Vac×[(1+α)/2], wherein Vac is a voltage of an AC power supply applied to the input connection part, and α equals a dispersion of capacitance values of the first varistor and the second varistor such that C 1 =C(1+α) and C 2 =C(1−α) such that the first varistor and the second varistor have capacitance values (C 1 and C 2 , respectively) between 1.6 times a nominal capacitance (C) of the first varistor and the second varistor and 0.4 times the nominal capacitance (C), and
a light source unit connected to the power supply circuit.

10. The lighting equipment according to claim 9 , wherein an allowable voltage of the first varistor and the second varistor is smaller than a voltage input to the first connection part and the second connection part.

11. The lighting equipment according to claim 9 , wherein a withstand voltage of the power supply circuit is set to be larger than a value of 1.6 times a voltage applied to the input connection part.

12. The lighting equipment according to claim 9 , wherein the lightning arrester device is an arrester, a capacitor or a parallel circuit of an arrester and a capacitor.

13. A method for manufacturing a power supply device comprising:
selecting a first varistor and a second varistor, wherein a maximum voltage (VzMAX) at which the first varistor or the second varistor maintains a high resistance is such that VzMAX≥Vac×[(1+α)/2], wherein Vac is a voltage of an AC power supply applied to an input connection part of the power supply device, and α equals a dispersion of capacitance values of the first varistor and the second varistor such that C 1 =C(1+α) and C 2 =C(1−α) such that the first varistor and the second varistor have capacitance values (C 1 and C 2 , respectively) between 1.6 times a nominal capacitance (C) and 0.4 times the nominal capacitance (C); and
connecting a first connection part and a second connection part with the first varistor and the second varistor connected in series, connecting a connection point of the first varistor and the second varistor and a grounding connection part with a lightning arrester device, and thereby, providing an anti-surge circuit having the first varistor, the second varistor and the lightning arrester device, wherein
a power supply circuit is connected to the anti-surge circuit.

14. The method for manufacturing a power supply device according to claim 13 , wherein a withstand voltage of the power supply circuit is set to be larger than a value of 1.6 times a voltage applied to the input connection part having the first connection part and the second connection part.

Assignees

• Mitsubishi Electric Corp
• Mitsubishi Electric Lighting Corp
• Mistubishi Electric Corp

Inventors

• Maeda Takashi
• Funayama Shinsuke
• Ohtsu Teiji

Classifications

• H05B47/24 Primary

  Circuit arrangements for protecting against overvoltage · CPC title

• H02M1/32

  Means for protecting converters other than automatic disconnection · CPC title

• H02M7/06

  using discharge tubes without control electrode or semiconductor devices without control electrode · CPC title

• H05B45/50 Primary

  responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits · CPC title