Small offline power supply
First Claim
1. A power converter circuit, comprising:
- a DC bus;
a half bridge transistor circuit coupled across the DC bus, the half bridge transistor circuit including a high-side transistor and a low-side transistor and producing an output pulse width modulation (PWM) signal therebetween;
a self oscillating half bridge driver circuit for producing first and second control PWM signals in response to an external threshold signal, the first control PWM signal coupled to a control terminal of the high-side transistor and the second control PWM signal coupled to a control terminal of the low-side transistor;
a low pass filter for receiving the output PWM signal and producing a DC output voltage in response thereto across a pair of output terminals; and
a programmable voltage regulating device having an input terminal coupled to the DC output voltage and an output terminal coupled to the external threshold voltage.
2 Assignments
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Accused Products
Abstract
A power supply includes a half bridge transistor circuit coupled across a DC bus, where the half bridge transistor circuit includes a high-side transistor and a low-side transistor and produces an output pulse width modulation (PWM) signal and a self oscillating half bridge driver circuit for producing first and second control PWM signals in response to an external threshold signal. The first control PWM signal is coupled to a control terminal of the high-side transistor and the second control PWM signal is coupled to a control terminal of the low-side transistor. The power supply also includes a low pass filter for receiving the output PWM signal and producing a DC output voltage therefrom across a pair of output terminals and a programmable voltage regulating device having an input terminal coupled to the DC output voltage and an output terminal coupled to the external threshold voltage.
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Citations
33 Claims
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1. A power converter circuit, comprising:
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a DC bus; a half bridge transistor circuit coupled across the DC bus, the half bridge transistor circuit including a high-side transistor and a low-side transistor and producing an output pulse width modulation (PWM) signal therebetween; a self oscillating half bridge driver circuit for producing first and second control PWM signals in response to an external threshold signal, the first control PWM signal coupled to a control terminal of the high-side transistor and the second control PWM signal coupled to a control terminal of the low-side transistor; a low pass filter for receiving the output PWM signal and producing a DC output voltage in response thereto across a pair of output terminals; and a programmable voltage regulating device having an input terminal coupled to the DC output voltage and an output terminal coupled to the external threshold voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A power converter circuit, comprising:
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a DC bus; a half bridge transistor circuit coupled across the DC bus, the half bridge transistor circuit including a high-side transistor and a low-side transistor and producing an output pulse width modulation (PWM) signal therebetween; a self oscillating half bridge driver circuit for producing first and second control PWM signals in response to an external threshold signal, the first control PWM signal coupled to a control terminal of the high-side transistor and the second control PWM signal coupled to a control terminal of the low-side transistor; a low pass filter for receiving the output PWM signal and producing a DC output current in response thereto from a pair of output terminals; a current sensing device for monitoring the DC output current and producing a voltage analog thereof; and a programmable voltage regulating device having an input terminal coupled to the voltage analog of the DC output current and an output terminal coupled to the external threshold voltage. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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Specification