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US 8,970,120 B2Granted
Lamp driving apparatus and illumination equipment using the same
AssigneeBeyond Innovation Technology Co., Ltd.
InventorsZhen-Chun Liu, Chen-Lung Kao
Life of this patent
Estimating the term…
Abstract
A lamp driving apparatus and an illumination equipment using the same are provided. The provided lamp driving apparatus is responsible for driving a lamp. When any one of two terminals of the lamp is opened or the lamp is over-voltage, the provided driving apparatus stops driving the lamp, and thus achieving the purpose of open lamp and over-voltage protection/detection.
Claims16
A lamp driving apparatus, comprising:
- a power switching circuit coupled between a DC input high-voltage and a ground potential, and configured to switch and output the DC input high-voltage and the ground potential in response to two output signals with a phase difference of 180 degrees, so as to generate a square signal;
- an LC resonator coupled to an output of the power switching circuit and configured to receive and convert the square signal, so as to generate a sinusoidal driving signal for driving a lamp;
- a control chip coupled to an input of the power switching circuit and operated under a DC operating voltage, and the control chip being configured to provide the output signals to control operation of the power switching circuit;
- and
- an open lamp and over-voltage detection circuit coupled to the control chip and connected across two terminals of the lamp, and the open lamp and over-voltage detection circuit being configured to:
- detect whether the lamp is opened or over-voltage;
- and send, when any one of the two terminals of the lamp is opened or the lamp is over-voltage, an abnormal signal indicating that any one of the two terminals of the lamp is opened or the lamp is over-voltage, to the control chip,
- wherein the control chip further stops providing the output signals in response to the abnormal signal,
- wherein the open lamp and over-voltage detection circuit is further configured to send, when the lamp is normal, a non signal indicating that the lamp is normal, to the control chip, so as to make the control chip to normally provide the output signals to control the operation of the power switching circuit,
- wherein the open lamp and over-voltage detection circuit comprises:
- a first capacitor having a first terminal coupled to a first terminal among the two terminals of the lamp;
- a second capacitor having a first terminal coupled to a second terminal of the first capacitor, and a second terminal coupled to the ground potential;
- a first diode having a cathode coupled to the second terminal of the first capacitor, and an anode coupled to the ground potential;
- a first Zener diode having a cathode coupled to the second terminal of the first capacitor;
- a third capacitor having a first terminal coupled to a second terminal among the two terminals of the lamp;
- a fourth capacitor having a first terminal coupled to a second terminal of the third capacitor, and a second terminal coupled to the ground potential;
- a second diode having a cathode coupled to the second terminal of the third capacitor, and an anode coupled to the ground potential;
- a second Zener diode having a cathode coupled to the second terminal of the third capacitor, and an anode coupled to an anode of the first Zener diode;
- an NPN-type bipolar junction transistor having a base coupled to the anodes of the first and the second Zener diodes, and an emitter configured to send the normal signal or the abnormal signal;
- a first resistor having a first terminal coupled to the DC operating voltage, and a second terminal coupled to a collector of the NPN-type bipolar junction transistor;
- a second resistor having a first terminal coupled to the emitter of the NPN-type bipolar junction transistor, and a second terminal coupled to the ground potential;
- and
- a third resistor connected across the base and the emitter of the NPN-type bipolar junction transistor.
20 more elements
An illumination equipment, comprising:
- a lamp configured to emit light in response to a sinusoidal driving signal;
- and
- a lamp driving apparatus, comprising:
- a power switching circuit coupled between a DC input high-voltage and a ground potential, and configured to switch and output the DC input high-voltage and the ground potential in response to two output signals with a phase difference of 180 degrees, so as to generate a square signal;
- an LC resonator coupled to an output of the power switching circuit and configured to receive and convert the square signal, so as to generate the sinusoidal driving signal for driving the lamp;
- a control chip coupled to an input of the power switching circuit and operated under a DC operating voltage, and the control chip being configured to provide the output signals to control operation of the power switching circuit;
- and
- an open lamp and over-voltage detection circuit coupled to the control chip and connected across two terminals of the lamp, and the open lamp and over-voltage detection circuit being configured to:
- detect whether the lamp is opened or over-voltage;
- and send, when any one of the two terminals of the lamp is opened or the lamp is over-voltage, an abnormal signal indicating that any one of the two terminals of the lamp is opened or the lamp is over-voltage, to the control chip,
- wherein the control chip further stops providing the output signals in response to the abnormal signal,
- wherein the open lamp and over-voltage detection circuit is further configured to send, when the lamp is normal, a normal signal indicating that the lamp is normal, to the control chip, so as to make the control chip to normally provide the output signals to control the operation of the power switching circuit,
- wherein the open lamp and over-voltage detection circuit comprises:
- a first capacitor having a first terminal coupled to a first terminal among the two terminals of the lamp;
- a second capacitor having a first terminal coupled to a second terminal of the first capacitor, and a second terminal coupled to the ground potential;
- a first diode having a cathode coupled to the second terminal of the first capacitor, and an anode coupled to the ground potential;
- a first Zener diode having a cathode coupled to the second terminal of the first capacitor;
- a third capacitor having a first terminal coupled to a second terminal among the two terminals of the lamp;
- a fourth capacitor having a first terminal coupled to a second terminal of the third capacitor, and a second terminal coupled to the ground potential;
- a second diode having a cathode coupled to the second terminal of the third capacitor, and an anode coupled to the ground potential;
- a second Zener diode having a cathode coupled to the second terminal of the third capacitor, and an anode coupled to an anode of the first Zener diode;
- an NPN-type bipolar junction transistor having a base coupled to the anodes of the first and the second Zener diodes, and an emitter configured to send the normal signal or the abnormal signal;
- a first resistor having a first terminal coupled to the DC operating voltage, and a second terminal coupled to a collector of the NPN-type bipolar junction transistor;
- a second resistor having a first terminal coupled to the emitter of the NPN-type bipolar junction transistor, and a second terminal coupled to the ground potential;
- and
- a third resistor connected across the base and the emitter of the NPN-type bipolar junction transistor.
23 more elements
Dependencies are inferred from the claim text.