APPLICATIONS OF HALOGEN CONVERTER CONTROL IC
First Claim
Patent Images
1. A power supply circuit for powering a load, comprising:
- a half-bridge comprising a pair of high-side and low-side switching devices arranged in series between a high-side supply circuit and a common return circuit;
a connection point between said switching devices providing a switched output for powering said load; and
an integrated circuit, including a high-side driver and a low-side driver for respectively providing drive signals to control terminals of said high- and low-side switching devices, said high- and low-side drivers being controlled by an oscillator and timing and logic elements in the integrated circuit;
further comprising a pair of drive resistors connected between the high- and low-side drivers and the corresponding control terminals of the switching devices, said drive resistors being effective to limit dv/dt at said control terminals.
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Accused Products
Abstract
The functionality of electronic convertors for low voltage filament lamp applications, such as halogen lamps, can be increased by including auxiliary circuits. Such auxiliary circuits may include gate drive resistors; a charge pump for sustaining the DC supply; open circuit protection; short circuit protection; thermal protection; extended resetting time; latched shutdown; self-dimming; a digital (DALI) interface; and line voltage compensation.
27 Citations
47 Claims
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1. A power supply circuit for powering a load, comprising:
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a half-bridge comprising a pair of high-side and low-side switching devices arranged in series between a high-side supply circuit and a common return circuit;
a connection point between said switching devices providing a switched output for powering said load; and
an integrated circuit, including a high-side driver and a low-side driver for respectively providing drive signals to control terminals of said high- and low-side switching devices, said high- and low-side drivers being controlled by an oscillator and timing and logic elements in the integrated circuit;
further comprising a pair of drive resistors connected between the high- and low-side drivers and the corresponding control terminals of the switching devices, said drive resistors being effective to limit dv/dt at said control terminals.
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2. A power supply circuit for powering a load, comprising:
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a half-bridge comprising a pair of high-side and low-side switching devices arranged in series between a high-side supply circuit and a common return circuit;
a connection point between said switching devices providing a switched output for powering said load; and
an integrated circuit, including a high-side driver and a low-side driver for respectively providing drive signals to control terminals of said high- and low-side switching devices, said high- and low-side drivers being controlled by an oscillator and timing and logic elements in the integrated circuit;
further comprising a charge pump circuit which feeds back current from said switched output to an IC bus supply terminal for contributing to power supplied to said IC. - View Dependent Claims (3, 4)
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5. A power supply circuit for powering a load, comprising:
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a half-bridge comprising a pair of high-side and low-side switching devices arranged in series between a high-side supply circuit and a common return circuit;
a connection point between said switching devices providing a switched output for powering said load; and
an integrated circuit, including a high-side driver and a low-side driver for respectively providing drive signals to control terminals of said high- and low-side switching devices, said high- and low-side drivers being controlled by an oscillator and timing and logic elements in the integrated circuit;
a protective circuit which responds to high dv/dt at the switched output by delivering a voltage peak to a current sense terminal of said IC. - View Dependent Claims (6, 7)
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8. A power supply circuit for powering a load, comprising:
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a half-bridge comprising a pair of high-side and low-side switching devices arranged in series between a high-side supply circuit and a common return circuit;
a connection point between said switching devices providing a switched output for powering said load; and
an integrated circuit, including a high-side driver and a low-side driver for respectively providing drive signals to control terminals of said high- and low-side switching devices, said high- and low-side drivers being controlled by an oscillator and timing and logic elements in the integrated circuit;
said IC having a shutdown terminal, a shutdown capacitor at said shutdown terminal being charged to a predetermined high level in order to shut down the IC and discharged to a predetermined low level in order to reset the IC;
a resistor interconnecting said shutdown capacitor and a voltage source in order to supply a current to said shutdown capacitor to prolong said discharge and thereby extend the resetting time of said IC. - View Dependent Claims (9, 10, 11)
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12. A power supply circuit for powering a load, comprising:
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a half-bridge comprising a pair of high-side and low-side switching devices arranged in series between a high-side supply circuit and a common return circuit;
a connection point between said switching devices providing a switched output for powering said load; and
an integrated circuit, including a high-side driver and a low-side driver for respectively providing drive signals to control terminals of said high- and low-side switching devices, said high- and low-side drivers being controlled by an oscillator and timing and logic elements in the integrated circuit;
wherein said IC has a latched shutdown mode;
further comprising a latched shutdown trigger circuit which responds to a short circuit condition at said switched output by placing said IC in said latched shutdown mode. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A power supply circuit for powering a load, comprising:
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a half-bridge comprising a pair of high-side and low-side switching devices arranged in series between a high-side supply circuit and a common return circuit;
a connection point between said switching devices providing a switched output for powering said load; and
an integrated circuit, including a high-side driver and a low-side driver for respectively providing drive signals to control terminals of said high- and low-side switching devices, said high- and low-side drivers being controlled by an oscillator and timing and logic elements in the integrated circuit; and
a PFC-correcting boost converter at the front end of said power supply circuit providing a smooth and regulated DC bus voltage.
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19. A power supply circuit for powering a load, comprising:
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a half-bridge comprising a pair of high-side and low-side switching devices arranged in series between a high-side supply circuit and a common return circuit;
a connection point between said switching devices providing a switched output for powering said load; and
an integrated circuit, including a high-side driver and a low-side driver for respectively providing drive signals to control terminals of said high- and low-side switching devices, said high- and low-side drivers being controlled by an oscillator and timing and logic elements in the integrated circuit; and
a peak detecting circuit which regulates output voltage by feeding back the load voltage to the current sense pin of the IC, whereby the oscillator frequency increases and the load voltage decreases in response to peaks of said load voltage. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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26. A method of supplying power to a load, using:
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a half-bridge comprising a pair of high-side and low-side switching devices arranged in series between a high-side supply circuit and a common return circuit;
a connection point between said switching devices providing a switched output for powering said load; and
an integrated circuit, including a high-side driver and a low-side driver for respectively providing drive signals to control terminals of said high- and low-side switching devices, said high- and low-side drivers being controlled by an oscillator and timing and logic elements in the integrated circuit;
said method comprising the step of limiting dv/dt at said control terminals with a pair of drive resistors connected between the high- and low-side drivers and the corresponding control terminals of the switching devices.
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27. A method of supplying power to a load, using:
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a half-bridge comprising a pair of high-side and low-side switching devices arranged in series between a high-side supply circuit and a common return circuit;
a connection point between said switching devices providing a switched output for powering said load; and
an integrated circuit, including a high-side driver and a low-side driver for respectively providing drive signals to control terminals of said high- and low-side switching devices, said high- and low-side drivers being controlled by an oscillator and timing and logic elements in the integrated circuit;
said method comprising the step of feeding back current from said switched output to an IC bus supply terminal for contributing to power supplied to said IC. - View Dependent Claims (28)
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29. A method of supplying power to a load, using:
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a half-bridge comprising a pair of high-side and low-side switching devices arranged in series between a high-side supply circuit and a common return circuit;
a connection point between said switching devices providing a switched output for powering said load; and
an integrated circuit, including a high-side driver and a low-side driver for respectively providing drive signals to control terminals of said high- and low-side switching devices, said high- and low-side drivers being controlled by an oscillator and timing and logic elements in the integrated circuit;
said method comprising the step of protecting said IC by delivering a voltage peak to a current sense terminal of said IC in response to high dv/dt at the switched output. - View Dependent Claims (30)
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31. A method of supplying power to a load, using:
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a half-bridge comprising a pair of high-side and low-side switching devices arranged in series between a high-side supply circuit and a common return circuit;
a connection point between said switching devices providing a switched output for powering said load; and
an integrated circuit, including a high-side driver and a low-side driver for respectively providing drive signals to control terminals of said high- and low-side switching devices, said high- and low-side drivers being controlled by an oscillator and timing and logic elements in the integrated circuit;
said IC having a shutdown terminal, a shutdown capacitor at said shutdown terminal being charged to a given high level in order to shut down the IC and discharged to a given low level in order to reset the IC;
said method comprising the step of supplying a current to said shutdown capacitor to prolong said discharge and thereby extend the resetting time of said IC. - View Dependent Claims (32, 33)
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34. A method of supplying power to a load, using:
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a half-bridge comprising a pair of high-side and low-side switching devices arranged in series between a high-side supply circuit and a common return circuit;
a connection point between said switching devices providing a switched output for powering said load; and
an integrated circuit, including a high-side driver and a low-side driver for respectively providing drive signals to control terminals of said high- and low-side switching devices, said high- and low-side drivers being controlled by an oscillator and timing and logic elements in the integrated circuit;
wherein said IC has a latched shutdown mode;
said method comprising the step of responding to a short circuit condition by placing said IC in said latched shutdown mode. - View Dependent Claims (35, 36, 37, 38, 39)
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40. A method of supplying power to a load, using:
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a half-bridge comprising a pair of high-side and low-side switching devices arranged in series between a high-side supply circuit and a common return circuit;
a connection point between said switching devices providing a switched output for powering said load; and
an integrated circuit, including a high-side driver and a low-side driver for respectively providing drive signals to control terminals of said high- and low-side switching devices, said high- and low-side drivers being controlled by an oscillator and timing and logic elements in the integrated circuit; and
said method comprising the step of providing a smooth and regulated DC bus voltage at the front end of said power supply circuit with a PFC-correcting boost converter.
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41. A method of supplying power to a load, using:
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a half-bridge comprising a pair of high-side and low-side switching devices arranged in series between a high-side supply circuit and a common return circuit;
a connection point between said switching devices providing a switched output for powering said load; and
an integrated circuit, including a high-side driver and a low-side driver for respectively providing drive signals to control terminals of said high- and low-side switching devices, said high- and low-side drivers being controlled by an oscillator and timing and logic elements in the integrated circuit; and
said method comprising the step of regulating output voltage by feeding back the load voltage to the current sense pin of the IC, whereby the oscillator frequency increases and the load voltage decreases in response to peaks of said load voltage. - View Dependent Claims (42, 43, 44, 45, 46)
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47. A method of avoiding high temperatures in a power supply circuit comprising at least one semiconductor switching device and a driver IC for driving said switching device, said driver IC having a thermal shutdown mode responsive to high temperatures at said driver IC;
said method comprising the step of providing an electrical conductor between said driver IC output and said switching device having sufficiently short length and high thermal conductivity to conduct sufficient heat from said switching device to said driver IC, so that said driver IC is placed in thermal shutdown mode before the switching device is damaged by said heat.
Specification