Piezo driver having low current quiesent operation for use in a personal alert safety system of a self-contained breathing apparatus
First Claim
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1. A self-contained breathing apparatus (SCBA) for use by emergency responders, comprising:
- a backpack;
a bottle of gas secured to the backpack; and
a personal alert safety system (PASS) comprisinga piezoelectric sound generator,a power supply,a piezoelectric controller, anda piezoelectric driver circuit comprising a push circuit comprising a first bipolar junction transistor (BJT), a second BJT, a third transistor, a first resistor, and a second resistor,wherein the first BJT has a base lead coupled to an output of the piezocontroller, an emitter lead coupled to ground, and a collector lead coupled to a first lead of the first resistor, to an input of the third transistor, and to a base lead of the second BJT,wherein a second lead of the first resistor is coupled to the power supply,wherein a power input lead of the third transistor is coupled to the power supply and an output of the third transistor is coupled to a first lead of the second resistor and to an emitter lead of the second BJT,wherein a second lead of the second resistor is coupled to the piezoelectric sound generator,wherein the collector lead of the second BJT is connected to ground.
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Abstract
Embodiments relate generally to personal alert safety systems (PASS) as well as the use of piezoelectric sound generators which may be located within a PASS device operable to alert others when user is in danger. Some embodiments further relate to the use of a PASS device in an SCBA. Embodiments may also relate to the design of piezoelectric driver circuits operable to sound one or more piezoelectric sound generators, wherein the driver circuit design may be low cost and energy efficient.
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Citations
20 Claims
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1. A self-contained breathing apparatus (SCBA) for use by emergency responders, comprising:
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a backpack; a bottle of gas secured to the backpack; and a personal alert safety system (PASS) comprising a piezoelectric sound generator, a power supply, a piezoelectric controller, and a piezoelectric driver circuit comprising a push circuit comprising a first bipolar junction transistor (BJT), a second BJT, a third transistor, a first resistor, and a second resistor, wherein the first BJT has a base lead coupled to an output of the piezocontroller, an emitter lead coupled to ground, and a collector lead coupled to a first lead of the first resistor, to an input of the third transistor, and to a base lead of the second BJT, wherein a second lead of the first resistor is coupled to the power supply, wherein a power input lead of the third transistor is coupled to the power supply and an output of the third transistor is coupled to a first lead of the second resistor and to an emitter lead of the second BJT, wherein a second lead of the second resistor is coupled to the piezoelectric sound generator, wherein the collector lead of the second BJT is connected to ground. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A personal alert safety system (PASS) for use in combination with a self-contained breathing apparatus (SCBA), comprising:
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a piezoelectric sound generator, a power supply, a piezoelectric controller, and a piezoelectric driver circuit comprising a push circuit comprising a first bipolar junction transistor (BJT), a second BJT, a third transistor, a first resistor, and a second resistor, wherein the first BJT has a base lead coupled to an output of the piezocontroller, an emitter lead coupled to ground, and a collector lead coupled to a first lead of the first resistor, to an input of the third transistor, and to a base lead of the second BJT, wherein a second lead of the first resistor is coupled to the power supply, wherein a power input lead of the third transistor is coupled to the power supply and an output of the third transistor is coupled to a first lead of the second resistor and to an emitter lead of the second BJT, wherein a second lead of the second resistor is coupled to the piezoelectric sound generator, wherein the collector lead of the second BJT is connected to ground. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A self-contained breathing apparatus (SCBA) for use by emergency responders, comprising:
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a backpack; a bottle of gas secured to the backpack; and a personal alert safety system (PASS) comprising a piezoelectric sound generator, a power supply, a piezoelectric controller, and a piezoelectric driver circuit comprising a push circuit comprising a first bipolar junction transistor (BJT), a second BJT, a third transistor, a first resistor, and a second resistor, wherein the first BJT has a base lead coupled to an output of the piezocontroller, an emitter lead coupled to ground, and a collector lead coupled to a first lead of the first resistor, to an input of the third transistor, and to a base lead of the second BJT, wherein a second lead of the first resistor is coupled to the power supply, wherein a power input lead of the third transistor is coupled to the power supply and an output of the third transistor is coupled to a first lead of the second resistor and to an emitter lead of the second BJT, wherein a second lead of the second resistor is coupled to the piezoelectric sound generator, wherein the collector lead of the second BJT is connected to ground, and the piezoelectric driver circuit further comprising a pull circuit comprising a fourth BJT, a fifth BJT, a sixth transistor, a third resistor, and a fourth resistor, wherein the fourth BJT has a base lead coupled to an output of the piezocontroller, an emitter lead coupled to ground, and a collector lead coupled to a first lead of the third resistor, to an input of the sixth transistor, and to a base lead of the fifth BJT, wherein a second lead of the third resistor is coupled to the power supply, wherein a power input lead of the sixth transistor is coupled to the power supply and an output of the sixth transistor is coupled to a first lead of the fourth resistor and to an emitter lead of the fifth BJT, wherein a second lead of the fourth resistor is coupled to the piezoelectric sound generator at an end opposite from the second end of the second resistor, wherein the collector lead of the fifth BJT is connected to ground. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification