Photoelectric flowmeter circuit and a photoelectric flowmeter
AssigneeShanghai Kohler Electronics, Ltd.
InventorsBin Cao, Jianlin Tang
Life of this patent
Estimating the term…
Abstract
A photoelectric flowmeter circuit includes a circuit power supply end. The photoelectric flowmeter circuit also includes a light-emitting element, including a first end electrically connected to the circuit power supply end and a second end electrically connected to ground. The photoelectric flowmeter circuit also includes a photosensitive triode, including a collector electrically connected to the circuit power supply end and an emitter electrically connected to the ground. The photoelectric flowmeter circuit also includes a direct current (DC) blocking circuit. The photoelectric flowmeter circuit also includes a circuit output end electrically connected to the collector of the photosensitive triode through the DC blocking circuit.
Claims19
A photoelectric flowmeter circuit, comprising:
- a circuit power supply end;
- a light-emitting element, comprising:
- a first end electrically connected to the circuit power supply end;
- and
- a second end electrically connected to ground;
- a photosensitive triode, comprising:
- a collector electrically connected to the circuit power supply end;
- and
- an emitter electrically connected to the ground;
- a direct current (DC) blocking circuit;
- and
- a circuit output end electrically connected to the collector of the photosensitive triode through the DC blocking circuit,
- wherein the DC blocking circuit further comprises:
- a clamp diode, comprising:
- a first end electrically connected to the circuit output end;
- and
- a second end electrically connected to the ground.
A photoelectric flowmeter, comprising:
- a flowmeter housing, comprising:
- an emitting head configured to emit light;
- and
- a receiving head configured to receive the light;
- and
- a photoelectric flowmeter circuit disposed in the flowmeter housing, the photoelectric flowmeter circuit comprising:
- a circuit power supply end;
- a light-emitting element disposed in the emitting head, the light-emitting element comprising:
- a first end electrically connected to the circuit power supply end;
- and
- a second end electrically connected to ground;
- a photosensitive triode disposed in the receiving head, the photosensitive triode comprising:
- a collector electrically connected to the circuit power supply end;
- and
- an emitter electrically connected to the ground;
- a direct current (DC) blocking circuit;
- and
- a circuit output end electrically connected to the collector of the photosensitive triode through the DC blocking circuit,
- wherein the DC blocking circuit further comprises:
- a clamp diode, comprising:
- a first end electrically connected to the circuit output end;
- and
- a second end electrically connected to the ground.
A method for using a photoelectric flowmeter, the method comprising:
- emitting, by a light-emitting element, light to be received by a photosensitive triode;
- supplying, by a pipeline, fluid to drive an impeller rotor to intermittently block a light path of the light between the light-emitting element and the photosensitive triode;
- transmitting, by the photosensitive triode, a corresponding output signal of the photosensitive triode to a direct current (DC) blocking circuit in response to a blocking or an unblocking of the light path;
- and
- clamping, by a clamp diode of the DC blocking circuit, a reverse voltage,
- wherein the clamp diode comprises a first end electrically connected to a circuit output end and comprises a second end electrically connected to ground.
Dependencies are inferred from the claim text.