Low power solenoid control system and method
First Claim
1. A method comprising the steps of:
- (a) closing a single first switch, thereby allowing a source current to flow through an inductor;
(b) opening the single first switch, thereby forcing a charge current to flow through an energy storage device utilizing the inductance of the inductor;
(c) repeating steps a and b until the energy storage device is sufficiently charged, wherein steps a and b are performed a predetermined number of times and the predetermined number of times is determined through a calibration process performed upon circuit assembly during manufacturing;
(d) upon command, closing a second switch, thereby forcing a discharge current to flow from the energy storage device to the inductor causing the inductor to produce an actuating magnetic field thereby actuating a mechanical valve.
1 Assignment
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Accused Products
Abstract
A low power solenoid control circuit including a power source in series with a sensing element and a first diode, an inductor to actuate a valve, an energy storage device to store and discharge energy into the inductor, diodes to control current flow, and switches and a controller to control the circuit. The circuit may be operated by closing a first switch, thereby allowing a source current to flow through an inductor; opening the first switch, thereby forcing a charge current to flow through an energy storage device utilizing the inductance of the inductor; repeating these steps until the energy storage device is sufficiently charged; and upon command, closing a second switch, thereby forcing a discharge current to flow from the energy storage device to the inductor causing the inductor to produce an actuating magnetic field thereby actuating a mechanical valve.
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Citations
32 Claims
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1. A method comprising the steps of:
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(a) closing a single first switch, thereby allowing a source current to flow through an inductor; (b) opening the single first switch, thereby forcing a charge current to flow through an energy storage device utilizing the inductance of the inductor; (c) repeating steps a and b until the energy storage device is sufficiently charged, wherein steps a and b are performed a predetermined number of times and the predetermined number of times is determined through a calibration process performed upon circuit assembly during manufacturing; (d) upon command, closing a second switch, thereby forcing a discharge current to flow from the energy storage device to the inductor causing the inductor to produce an actuating magnetic field thereby actuating a mechanical valve. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method comprising the steps of:
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(a) opening a first single pole single throw (SPST) switch and closing a second SPST switch, thereby forward biasing a first diode, allowing a source current to flow through a capacitor charging the capacitor; (b) opening the second SPST switch, thereby reverse biasing a second diode and maintaining the charge of the capacitor; (c) closing the first SPST switch, thereby allowing the source current to flow through a solenoid coil; (d) opening the first SPST switch, thereby forward biasing the second diode and forcing a charge current to flow through the capacitor utilizing the inductance of the solenoid coil; (e) repeating steps c and d until the capacitor is sufficiently charged; (f) upon command, closing both the first and second SPST switches, thereby reverse biasing both the first and second diodes and forcing a discharge current to flow from the capacitor to the solenoid coil causing the solenoid coil to produce an actuating magnetic field thereby actuating a mechanical valve, wherein step c is maintained until the source current reaches a first predetermined level as measured through a current sensing element. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A method comprising the steps of:
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(a) opening a first single pole single throw (SPST) switch and closing a second SPST switch, thereby forward biasing a first diode, allowing a source current to flow through a capacitor charging the capacitor; (b) opening the second SPST switch, thereby reverse biasing a second diode and maintaining the charge of the capacitor; (c) closing the first SPST switch, thereby allowing the source current to flow through a solenoid coil; (d) opening the first SPST switch, thereby forward biasing the second diode and forcing a charge current to flow through the capacitor utilizing the inductance of the solenoid coil; (e) repeating steps c and d until the capacitor is sufficiently charged; (f) upon command, closing both the first and second SPST switches, thereby reverse biasing both the first and second diodes and forcing a discharge current to flow from the capacitor to the solenoid coil causing the solenoid coil to produce an actuating magnetic field thereby actuating a mechanical valve, wherein steps c and d are performed a predetermined number of times determined through a calibration process and accounts for both component tolerances and ambient temperature. - View Dependent Claims (20, 21, 22, 23)
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24. A method comprising the steps of:
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(a) opening a first single pole single throw (SPST) switch and closing a second SPST switch, thereby forward biasing a first diode, allowing a source current to flow through a capacitor charging the capacitor; (b) opening the second SPST switch, thereby reverse biasing a second diode and maintaining the charge of the capacitor; (c) closing the first SPST switch, thereby allowing the source current to flow through a solenoid coil; (d) opening the first SPST switch, thereby forward biasing the second diode and forcing a charge current to flow through the capacitor utilizing the inductance of the solenoid coil; (e) repeating steps c and d until the capacitor is sufficiently charged; (f) upon command, closing both the first and second SPST switches, thereby reverse biasing both the first and second diodes and forcing a discharge current to flow from the capacitor to the solenoid coil causing the solenoid coil to produce an actuating magnetic field thereby actuating a mechanical valve; (g) after the valve has been actuated, monitoring the source current through a current sensing element; and (h) once the source current reaches a predetermined level, repeating steps a and b to recharge the energy storage device. - View Dependent Claims (25, 26, 27, 28)
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29. A method comprising the steps of:
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(a) opening a first single pole single throw (SPST) switch and closing a second SPST switch, thereby forward biasing a first diode, allowing a source current to flow through a capacitor charging the capacitor; (b) opening the second SPST switch, thereby reverse biasing a second diode and maintaining the charge of the capacitor; (c) closing the first SPST switch, thereby allowing the source current to flow through a solenoid coil; (d) opening the first SPST switch, thereby forward biasing the second diode and forcing a charge current to flow through the capacitor utilizing the inductance of the solenoid coil; (e) repeating steps c and d until the capacitor is sufficiently charged; (f) upon command, closing both the first and second SPST switches, thereby reverse biasing both the first and second diodes and forcing a discharge current to flow from the capacitor to the solenoid coil causing the solenoid coil to produce an actuating magnetic field thereby actuating a mechanical valve, wherein steps a, b, c, d, and e further comprise; maintaining the first SPST switch closed until the source current rises to a first predetermined level; opening the first SPST switch when the source current rises to the first predetermined level; and closing the first SPST switch once the source current falls to a second predetermined level. - View Dependent Claims (30, 31, 32)
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Specification