A kind of ultra-low impedance aluminum electrolytic capacitor for switching power supply

Abstract

The invention discloses an ultra-low impedance aluminum electrolytic capacitor for a switching power supply, which comprises a shell provided with an opening, a core arranged inside the shell and a rubber plug sealed and connected to the opening of the shell; the core is impregnated with electrolytic liquid; the electrolyte includes the following components in percentage by weight: solute: 5%-25%, additive 1%-10%, and the balance is solvent; the solute is ammonium glycolate, ammonium formate, horse Ammonium formate and phthalic acid, described additive is deactivator, ammonium dihydrogen phosphate and nitrobenzoic acid, and described solvent is ethylene glycol, γ-butyrolactone, glycerol and water. In the present invention, by developing a high-performance electrolyte, selecting a suitable electrode foil and controlling the sealing, the aluminum electrolytic capacitor produced has low impedance, can withstand larger ripple currents, and can meet the miniaturization of the current switching power supply. Capacity, ripple current resistance, high frequency and low impedance, high temperature and long life, and more suitable for high-density assembly requirements.

Description

technical field

[0001] The invention relates to the technical field of aluminum electrolytic capacitors, in particular to an ultra-low impedance aluminum electrolytic capacitor for switching power supplies. Background technique

[0002] Switching power supply is the main category of electronic power supply products. Because of its wide input voltage range, small size, light weight, high power conversion efficiency, and low standby power consumption, it has developed rapidly and gradually replaced linear power supplies. Frequency power supply, used in almost all electronic equipment such as various intelligent electronic terminal equipment and communication equipment, is an indispensable device in the rapid development of today's electronic information industry. As switching power supplies gradually become more high-frequency, thinner, and smaller, the proportion of thin switching power supplies in the entire power supply industry will increase.

[0003] As an aluminum elect...

Examples

Embodiment 1

[0045] An ultra-low impedance aluminum electrolytic capacitor for a switching power supply, comprising a shell provided with an opening, a core inside the shell and a rubber plug sealingly connected to the opening of the shell; the core is laminated by electrode foil and electrolytic paper It is wound, and the core is soaked with electrolyte; the electrolyte includes the following components in weight percentage: 18% solute, 5% additive, and the balance is solvent; the solute is glycol ammonium , ammonium formate, ammonium maleate and phthalic acid, the mass ratio of described ethylene glycol ammonium, ammonium formate, ammonium maleate and phthalic acid is 4:3:2:1; Described additive is passivator , ammonium dihydrogen phosphate and nitrobenzoic acid, the mass ratio of the passivator, ammonium dihydrogen phosphate and nitrobenzoic acid is 5:3:2; the solvent is ethylene glycol, gamma-butyrolactone, Glycerol and water, the mass ratio of described ethylene glycol, γ-butyrolacton...

Embodiment 2

[0049] An ultra-low impedance aluminum electrolytic capacitor for a switching power supply, comprising a shell provided with an opening, a core inside the shell and a rubber plug sealingly connected to the opening of the shell; the core is laminated by electrode foil and electrolytic paper It is wound, and the core is soaked with electrolyte; the electrolyte includes the following components in weight percentage: 5% solute, 1% additive, and the balance is solvent; the solute is glycol ammonium , ammonium formate, ammonium maleate and phthalic acid, the mass ratio of the ammonium glycolate, ammonium formate, ammonium maleate and phthalic acid is 3:2:1:0.5; the additive is a passivator , ammonium dihydrogen phosphate and nitrobenzoic acid, the mass ratio of the passivator, ammonium dihydrogen phosphate and nitrobenzoic acid is 4:2:1; the solvent is ethylene glycol, gamma-butyrolactone, Glycerol and water, the mass ratio of the ethylene glycol, γ-butyrolactone, glycerol and water...

Embodiment 3

[0053] An ultra-low impedance aluminum electrolytic capacitor for a switching power supply, comprising a shell provided with an opening, a core inside the shell and a rubber plug sealingly connected to the opening of the shell; the core is laminated by electrode foil and electrolytic paper It is wound, and the core is soaked with electrolyte; the electrolyte includes the following components in weight percentage: 25% solute, 10% additive, and the balance is solvent; the solute is glycol ammonium , ammonium formate, ammonium maleate and o-benzoic acid, the mass ratio of the ammonium glycolate, ammonium formate, ammonium maleate and o-benzoic acid is 5:4:3:1.5; the additive is a passivator , ammonium dihydrogen phosphate and nitrobenzoic acid, the mass ratio of the passivator, ammonium dihydrogen phosphate and nitrobenzoic acid is 6:4:3; the solvent is ethylene glycol, gamma-butyrolactone, Glycerol and water, the mass ratio of described ethylene glycol, γ-butyrolactone, glycerol...

technical field

[0001] The invention relates to the technical field of aluminum electrolytic capacitors, in particular to an ultra-low impedance aluminum electrolytic capacitor for switching power supplies. Background technique

[0002] Switching power supply is the main category of electronic power supply products. Because of its wide input voltage range, small size, light weight, high power conversion efficiency, and low standby power consumption, it has developed rapidly and gradually replaced linear power supplies. Frequency power supply, used in almost all electronic equipment such as various intelligent electronic terminal equipment and communication equipment, is an indispensable device in the rapid development of today's electronic information industry. As switching power supplies gradually become more high-frequency, thinner, and smaller, the proportion of thin switching power supplies in the entire power supply industry will increase.

[0003] As an aluminum elect...

Examples

Embodiment 1

[0045] An ultra-low impedance aluminum electrolytic capacitor for a switching power supply, comprising a shell provided with an opening, a core inside the shell and a rubber plug sealingly connected to the opening of the shell; the core is laminated by electrode foil and electrolytic paper It is wound, and the core is soaked with electrolyte; the electrolyte includes the following components in weight percentage: 18% solute, 5% additive, and the balance is solvent; the solute is glycol ammonium , ammonium formate, ammonium maleate and phthalic acid, the mass ratio of described ethylene glycol ammonium, ammonium formate, ammonium maleate and phthalic acid is 4:3:2:1; Described additive is passivator , ammonium dihydrogen phosphate and nitrobenzoic acid, the mass ratio of the passivator, ammonium dihydrogen phosphate and nitrobenzoic acid is 5:3:2; the solvent is ethylene glycol, gamma-butyrolactone, Glycerol and water, the mass ratio of described ethylene glycol, γ-butyrolacton...

Embodiment 2

[0049] An ultra-low impedance aluminum electrolytic capacitor for a switching power supply, comprising a shell provided with an opening, a core inside the shell and a rubber plug sealingly connected to the opening of the shell; the core is laminated by electrode foil and electrolytic paper It is wound, and the core is soaked with electrolyte; the electrolyte includes the following components in weight percentage: 5% solute, 1% additive, and the balance is solvent; the solute is glycol ammonium , ammonium formate, ammonium maleate and phthalic acid, the mass ratio of the ammonium glycolate, ammonium formate, ammonium maleate and phthalic acid is 3:2:1:0.5; the additive is a passivator , ammonium dihydrogen phosphate and nitrobenzoic acid, the mass ratio of the passivator, ammonium dihydrogen phosphate and nitrobenzoic acid is 4:2:1; the solvent is ethylene glycol, gamma-butyrolactone, Glycerol and water, the mass ratio of the ethylene glycol, γ-butyrolactone, glycerol and water...

Embodiment 3

[0053] An ultra-low impedance aluminum electrolytic capacitor for a switching power supply, comprising a shell provided with an opening, a core inside the shell and a rubber plug sealingly connected to the opening of the shell; the core is laminated by electrode foil and electrolytic paper It is wound, and the core is soaked with electrolyte; the electrolyte includes the following components in weight percentage: 25% solute, 10% additive, and the balance is solvent; the solute is glycol ammonium , ammonium formate, ammonium maleate and o-benzoic acid, the mass ratio of the ammonium glycolate, ammonium formate, ammonium maleate and o-benzoic acid is 5:4:3:1.5; the additive is a passivator , ammonium dihydrogen phosphate and nitrobenzoic acid, the mass ratio of the passivator, ammonium dihydrogen phosphate and nitrobenzoic acid is 6:4:3; the solvent is ethylene glycol, gamma-butyrolactone, Glycerol and water, the mass ratio of described ethylene glycol, γ-butyrolactone, glycerol...