High pressure transducer
A high pressure transducer is disclosed. The transducer includes a supply inlet configured to provide a gas supply to the high pressure transducer at a supply pressure and a pressure divider section coupled to the supply inlet. The pressure divider section is configured to reduce the supply pressure to a reduced pressure as a function of a first predetermined ratio. The transducer also includes a low pressure control section coupled to the pressure divider section and configured to receiving the gas supply at the reduced pressure and an amplifying section coupled to the low pressure control section. The low pressure control section varies the reduced pressure to produce a variable control pressure to actuate the amplifying section in response thereto. The amplifying section is also configured to multiply the variable control pressure as a function of a second ratio to obtain an output pressure. Further, the transducer includes a main supply valve coupled to the amplifying section, wherein the amplifying section controls the main supply valve.
1. A high pressure transducer comprising:
a supply inlet configured to provide a gas supply to the high pressure transducer at a variable supply pressure, wherein the variable supply pressure is greater than or equal to 750PSI;
a pressure divider section comprising a ratio piston assembly having a lower small area piston and an upper large area piston, coupled to the supply inlet and configured to reduce the variable supply pressure, by a fixed ratio equal to a ratio of the diameter of the lower small area piston to the diameter of the upper large area piston, and wherein the reduced pressure is variable, proportional to the variable supply pressure, and less than or equal to 200PSI;
a low pressure control section coupled to the pressure divider section, the low pressure control section comprising at least one pair of feed and bleed valves, the low pressure control section configured to receive the reduced pressure gas from the pressure divider section and to vary the pressure to produce a variable control pressure;
an amplifying section coupled to the low pressure control section and coupled to a main supply valve, wherein the low pressure control section actuates the amplifying section in response to the variable control pressure, the amplifying section configured to control the main supply valve to produce an output pressure that is a multiple of the variable control pressure by modulating the variable input pressure applied to the main supply valve; and
an electrical feedback control circuit having a first pressure sensor for monitoring pressure in the pressure divider section and a second pressure sensor for monitoring output pressure in the amplifying section, the feedback control circuit configured to control the low pressure control section as a function of the pressure in the pressure divider section, the pressure in the amplifying section, and a control signal.
2. A high pressure transducer according to claim 1 , wherein the amplifying section comprises a multiplying ratio piston assembly configured to modulate the output pressure of the supply valve based on the variable control pressure.
3. A high pressure transducer according to claim 1 , wherein the pressure divider section comprises a flapper nozzle valve configured to control output of the pressure divider section.
4. A high pressure transducer according to claim 3 , wherein the flapper nozzle valve comprises a flapper column configured to act as a force limiter.
5. A high pressure transducer according to claim 1 , wherein the electrical feedback control circuit further comprises a pulse width modulated controller which controls the low pressure control section as a function of at least one of the pressure in the pressure divider section, pressure in the amplifying section, and a control signal.
6. A method for controlling a high pressure transducer, comprising the steps of:
providing a gas supply at a variable supply pressure through a supply inlet to the high pressure transducer, wherein the variable supply pressure is greater than or equal to 750PSI;
receiving the gas supply at a pressure divider section coupled to the supply inlet, the pressure divider section comprising a ratio piston assembly having a lower small area piston and an upper large area piston, the pressure divider section configured to reduce the variable supply pressure by a fixed ratio equal to the ratio of the diameter of the lower small area piston to the diameter of the upper large area piston, and wherein the reduced pressure is variable, proportional to the variable supply pressure, and less than or equal to 200PSI;
supplying a low pressure control section which is coupled to the pressure divider section with the reduced pressure gas, wherein the low pressure control section comprises at least one pair of feed and bleed valves configured to receive the low pressure gas from the pressure divider and to vary the reduced pressure to produce a variable control pressure output;
transporting the variable control pressure output of the low pressure control section to an amplifying section which is coupled to the low pressure control section and coupled to a main supply valve, the amplifying section configured to be actuated by the low pressure control section in response to the variable control pressure;
controlling the main supply valve to produce an output pressure through the main supply valve that is a multiple of the variable control pressure, by modulating the variable input pressure applied to the main supply valve, wherein the amplifying section controls the main supply valve;
receiving, by a control circuit, a first sensor signal from a first pressure sensor configured to monitor the pressure in the pressure divider section;
receiving, by the control circuit, a second sensor signal from a second pressure sensor configured to monitor the pressure in the amplifying section;
determining, by the control circuit, control signals configured to control the feed and bleed valves based at least in part on the first and second sensor signals; and
transmitting, by the control circuit, the control signals to the feed and bleed valves.
7. A method according to claim 6 , wherein the amplifying section of the transporting step comprises a multiplying ratio piston assembly configured to modulate the output pressure of the supply valve based on the variable control pressure.
8. A high pressure transducer comprising:
a supply inlet configured to provide a gas supply to the high pressure transducer at a variable supply pressure, wherein the variable supply pressure is greater than or equal to 750PSI;
a pressure divider section comprising a ratio piston assembly having a lower small area piston and an upper large area piston, coupled to the supply inlet and configured to reduce the variable supply pressure by a fixed ratio equal to a ratio of the diameter of the lower small area piston to the diameter of the upper large area piston, and wherein the reduced pressure is variable, proportional to the variable supply pressure, and less than or equal to 200PSI;
a low pressure control section coupled to the pressure divider section, the low pressure control section comprising at least one pair of feed and bleed valves, the low pressure control section configured to receive the reduced pressure gas from the pressure divider section and to vary the pressure to produce a variable control pressure;
an amplifying section coupled to the low pressure control section and coupled to a main supply valve, wherein the low pressure control section actuates the amplifying section in response to the variable control pressure, the amplifying section configured to control the main supply valve to produce an output pressure that is a multiple of the variable control pressure by modulating the variable input pressure applied to the main supply valve; and
an electrical feedback control circuit configured to:
receive a first sensor signal from a first pressure sensor configured to monitor the pressure in the pressure divider section,
receive a second sensor signal from a second pressure sensor configured to monitor the pressure in the amplifying section, and
activate the feed and bleed valves to control the pressure in the low pressure control section and the output pressure of the main supply valve, based at least in part on the first sensor signal and the second sensor signal.