Solenoid-operated valve and solenoid-operated valve-driving circuit
AssigneeSMC Corporation
InventorShigeharu Oide
Life of this patent
Estimating the term…
Abstract
When a power source voltage is applied to a switch control section, a control signal is supplied from the switch control section to a transistor. The transistor is placed in an ON state during a period of time corresponding to a pulse width of the control signal. The power source voltage is applied as a first voltage to a solenoid coil. On the other hand, when supply of the control signal to the transistor is stopped, the transistor is placed in an OFF state. A voltage-generating section generates a DC voltage, which is lower than the power source voltage. The transistor applies the generated DC voltage as a second voltage to the solenoid coil.
Claims19
A solenoid-operated valve, which is driven by applying a first voltage to a solenoid coil and which is maintained in a driven state by applying a second voltage lower than said first voltage, said solenoid-operated valve comprising:
- a solenoid-operated valve-driving circuit electrically connected respectively to a power source and to said solenoid coil,
- said solenoid-operated valve-driving circuit including a switch control section, a switch section, and a voltage-generating section, wherein
- said switch control section generates a control signal, the generated control signal being supplied to said switch section;
- said switch section is placed in an ON state during a period of time in which said control signal is supplied from said switch control section, a power source voltage of said power source being applied as said first voltage to said solenoid coil during the period of time of said ON state;
- and
- said voltage-generating section generates said second voltage on the basis of said power source voltage during a period of time in which said switch section is in an OFF state, said generated second voltage being applied to said solenoid coil.
A solenoid-operated valve, which is driven by applying a first voltage to a solenoid coil and which is maintained in a driven state by applying a second voltage, said solenoid-operated valve comprising:
- a solenoid-operated valve-driving circuit electrically connected respectively to a power source and to said solenoid coil,
- said solenoid-operated valve-driving circuit including a switch control section and a switch section, wherein
- said switch control section generates a control signal composed of first and second pulse signals, the generated control signal being supplied to said switch section;
- and
- said switch section applies a power source voltage of said power source, as said first voltage, to said solenoid coil during a period of time in which said first pulse signal is supplied, while said switch section applies said power source voltage, as said second voltage, to said solenoid coil during a period of time in which said second pulse signal is supplied.
A solenoid-operated valve, which is driven by applying a first voltage to a solenoid coil and which is maintained in a driven state by applying a second voltage, said solenoid-operated valve comprising:
- a solenoid-operated valve-driving circuit electrically connected respectively to a power source and to said solenoid coil,
- said solenoid-operated valve-driving circuit including a switch control section, a switch section, and a voltage-generating section, wherein
- said switch control section generates a control signal composed of first and second pulse signals, the generated control signal being supplied to said switch section;
- said voltage-generating section generates a voltage having a voltage value larger than that of a power source voltage of said power source, the generated voltage being supplied to said switch section;
- and
- said switch section applies said voltage having the larger voltage value, as said first voltage, to said solenoid coil during a period of time in which said first pulse signal is supplied, while said switch section applies a voltage having a voltage value substantially equal to that of said first voltage, as said second voltage, to said solenoid coil during a period of time in which said second pulse signal is supplied.
A solenoid-operated valve-driving circuit, which drives a solenoid-operated valve by applying a first voltage to a solenoid coil of said solenoid-operated valve and which maintains said solenoid-operated valve in a driven state by applying a second voltage lower than said first voltage, said solenoid-operated valve-driving circuit comprising:
- a switch control section;
- a switch section;
- and
- a voltage-generating section;
- said solenoid-operated valve-driving circuit electrically connected respectively to a power source and to said solenoid coil, wherein
- said switch control section generates a control signal, the generated control signal being supplied to said switch section;
- said switch section is placed in an ON state during a period of time in which said control signal is supplied from said switch control section, a power source voltage of said power source being applied as said first voltage to said solenoid coil during the period of time of said ON state;
- and
- said voltage-generating section generates said second voltage on the basis of said power source voltage during a period of time in which said switch section is in an OFF state, said generated second voltage being applied to said solenoid coil.
A solenoid-operated valve-driving circuit, which drives a solenoid-operated valve by applying a first voltage to a solenoid coil of said solenoid-operated valve and which maintains said solenoid-operated valve in a driven state by applying a second voltage, said solenoid-operated valve-driving circuit comprising:
- a switch control section;
- and
- a switch section,
- said solenoid-operated valve-driving circuit electrically connected respectively to a power source and to said solenoid coil, wherein
- said switch control section generates a control signal composed of first and second pulse signals, the generated control signal being supplied to said switch section;
- and
- said switch section applies a power source voltage of said power source, as said first voltage, to said solenoid coil during a period of time in which said first pulse signal is supplied, while said switch section applies said power source voltage, as said second voltage, to said solenoid coil during a period of time in which said second pulse signal is supplied.
A solenoid-operated valve-driving circuit, which drives a solenoid-operated valve by applying a first voltage to a solenoid coil of said solenoid-operated valve and which maintains said solenoid-operated valve in a driven state by applying a second voltage, said solenoid-operated valve-driving circuit comprising:
- a switch control section;
- a switch section;
- and
- a voltage-generating section;
- said solenoid-operated valve-driving circuit electrically connected respectively to a power source and to said solenoid coil, wherein
- said switch control section generates a control signal composed of first and second pulse signals, the generated control signal being supplied to said switch section;
- said voltage-generating section generates a voltage having a voltage value larger than that of a power source voltage of said power source, the generated voltage being supplied to said switch section;
- and
- said switch section applies said voltage having the larger voltage value, as said first voltage, to said solenoid coil during a period of time in which said first pulse signal is supplied, while said switch section applies a voltage having a voltage value substantially equal to that of said first voltage, as said second voltage, to said solenoid coil during a period of time in which said second pulse signal is supplied.
Dependencies are inferred from the claim text.