# US 2019/0174588 A1 · Analog filament impedance circuit, led lamp tube and led lighting system

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- Number: US 2019/0174588 A1
- Document ID: US20190174588A1
- Status: Published application
- Kind: A1
- Application number: 16/266,013
- Filed: 2019-02-02
- Published: 2019-06-06
- Earliest claimed: 2016-08-03
- Assignees: Opple Lighting Co., Ltd.
- Applicants: Opple Lighting Co., Ltd.
- Inventors: Wei WEN
- Web page: https://patentgrep.com/patent/US20190174588A1

## CPC

- H05B 45/3578: Emulating the electrical or functional characteristics of discharge lamps
- F21K 9/278: Arrangement or mounting of circuit elements integrated in the light source
- F21V 23/003: {the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array}
- Y02B 20/30: Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- F21K: NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
- F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS

## Abstract

The present disclosure provides an analog filament impedance circuit, an LED lamp tube and an LED lighting system, the analog filament impedance circuit having a pole frequency and a zero frequency, where: the pole frequency is less than the zero frequency; an equivalent impedance value of the analog filament impedance circuit remains unchanged when an input frequency is less than the pole frequency, and is a first equivalent impedance value; an equivalent impedance value of the analog filament impedance circuit decreases as the input frequency increases when the input frequency is greater than the pole frequency and less than the zero frequency; an equivalent impedance value of the analog filament impedance circuit remains unchanged when the input frequency is greater than the zero frequency, and is a second equivalent impedance value; and the first equivalent impedance value is greater than the second equivalent impedance value.

## Claims

### Claim 1

An analog filament impedance circuit, comprising a pole frequency and a zero frequency, wherein:
the pole frequency is less than the zero frequency;
an equivalent impedance value of the analog filament impedance circuit remains unchanged when an input frequency is less than the pole frequency, and is a first equivalent impedance value;
an equivalent impedance value of the analog filament impedance circuit decreases as the input frequency increases when the input frequency is greater than the pole frequency and less than the zero frequency;
an equivalent impedance value of the analog filament impedance circuit remains unchanged when the input frequency is greater than the zero frequency, and is a second equivalent impedance value; and
the first equivalent impedance value is greater than the second equivalent impedance value.

### Claim 2 (depends on 1)

The analog filament impedance circuit according to claim 1, wherein the circuit comprises a first resistor, a second resistor and a first capacitor.

### Claim 3 (depends on 2)

The analog filament impedance circuit according to claim 2, wherein the first resistor and the first capacitor are connected in parallel, and then connected in series with the second resistor.

### Claim 4 (depends on 2)

The analog filament impedance circuit according to claim 2, wherein the first resistor and the first capacitor are connected in series, and then connected in parallel with the second resistor.

### Claim 5

An LED lamp tube, comprising:
at least one analog filament impedance circuit wherein the at least one analog filament impedance circuit comprises a pole frequency and a zero frequency, and wherein: the pole frequency is less than the zero frequency; an equivalent impedance value of the analog filament impedance circuit remains unchanged when an input frequency is less than the pole frequency, and is a first equivalent impedance value; an equivalent impedance value of the analog filament impedance circuit decreases as the input frequency increases when the input frequency is greater than the pole frequency and less than the zero frequency; an equivalent impedance value of the analog filament impedance circuit remains unchanged when the input frequency is greater than the zero frequency, and is a second equivalent impedance value; and the first equivalent impedance value is greater than the second equivalent impedance value; and
an LED driving module and at least one LED light emitting element, wherein: the LED driving module is coupled with the analog filament impedance circuit, and the at least one light emitting element is coupled with the LED driving module.

### Claim 6 (depends on 5)

The LED lamp tube according to claim 5, wherein the LED lamp tube comprises four analog filament impedance circuits which comprise a first analog filament impedance circuit, a second analog filament impedance circuit, a third analog filament impedance circuit and a fourth analog filament impedance circuit, and wherein the first analog filament impedance circuit and the second analog filament impedance circuit being connected in series, and the third analog filament impedance circuit and the fourth analog filament impedance circuit being connected in series.

### Claim 7 (depends on 5)

An LED lighting system, comprising: an inductive ballast, the LED lamp tube according to claim 5 coupled with the inductive ballast, and a glow starter coupled with the LED lamp tube.

### Claim 8 (depends on 7)

The LED lighting system according to claim 7, wherein the LED lamp tube includes four analog filament impedance circuits which comprise a first analog filament impedance circuit, a second analog filament impedance circuit, a third analog filament impedance circuit and a fourth analog filament impedance circuit, and wherein the first analog filament impedance circuit and the second analog filament impedance circuit being connected in series, and the third analog filament impedance circuit and the fourth analog filament impedance circuit being connected in series.

### Claim 9 (depends on 8)

The LED lighting system according to claim 8, wherein:
one end of the LED driving module is connected with one end of the first analog filament impedance circuit and one end of the second analog filament impedance circuit, another end of the LED driving module is connected with the at least one LED light emitting element, and another end of the at least one LED light emitting element is connected with one end of the third analog filament impedance circuit and one end of the fourth analog filament impedance circuit; and
one end of the first analog filament impedance circuit not connected with the LED driving module is connected with the inductive ballast, one end of the second analog filament impedance circuit not connected with the LED driving module is connected with one end of an external glow starter of the LED lamp tube, one end of the third analog filament impedance circuit not connected with the at least one LED light emitting element is connected with a neutral wire in connection with a mains electricity supply, and one end the fourth analog filament impedance circuit not connected with the at least one LED light emitting element is connected with the other end of the glow starter.

### Claim 10 (depends on 5)

An LED lighting system, comprising: an electronic ballast and the LED lamp tube according to claim 5 coupled with the electronic ballast.

### Claim 11 (depends on 10)

The LED lighting system according to claim 10, wherein the LED lamp tube comprises four analog filament impedance circuits which comprise a first analog filament impedance circuit, a second analog filament impedance circuit, a third analog filament impedance circuit and a fourth analog filament impedance circuit, and wherein the first analog filament impedance circuit and the second analog filament impedance circuit being connected in series, and the third analog filament impedance circuit and the fourth analog filament impedance circuit being connected in series.

### Claim 12 (depends on 11)

The LED lighting system according to claim 11, wherein:
one end of the LED driving module is connected with one end of the first analog filament impedance circuit and one end of the second analog filament impedance circuit, another end of the LED driving module is connected with the at least one LED light emitting element, and another end of the at least one LED light emitting element is connected with one end of the third analog filament impedance circuit and one end of the fourth analog filament impedance circuit; and
one end of the first analog filament impedance circuit not connected with the LED driving module is connected with the external electronic ballast of the LED lamp tube, one end of the second analog filament impedance circuit not connected with the LED driving module is connected with the external electronic ballast of the LED lamp tube, one end of the third analog filament impedance circuit not connected with the at least one LED light emitting element is connected with the electronic ballast, and one end the fourth analog filament impedance circuit not connected with the at least one LED light emitting element is connected with the electronic ballast.

### Claim 13

A method of utilizing an analog filament impedance circuit, comprising:
obtaining a pole frequency that is less than a zero frequency;
keeping an equivalent impedance value of the analog filament impedance circuit remains unchanged when an input frequency is less than the pole frequency, and is a first equivalent impedance value;
decreasing an equivalent impedance value of the analog filament impedance circuit as the input frequency increases when the input frequency is greater than the pole frequency and less than the zero frequency;
keeping an equivalent impedance value of the analog filament impedance circuit remains unchanged when the input frequency is greater than the zero frequency, and is a second equivalent impedance value; and
obtaining the first equivalent impedance value that is greater than the second equivalent impedance value.