Switch control system

• US 8,751,051 B2
• Filed: 08/17/2011
• Issued: 06/10/2014
• Est. Priority Date: 04/18/2011
• Status: Expired due to Fees

• Current Assignee: Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. (Hon Hai Precision Industry Co., Ltd.), Hon Hai Precision Industry Co., Ltd.
• Original Assignee: Hong Fu Jin Precision Industry (Shenzhen) Co., Ltd. (Hon Hai Precision Industry Co., Ltd.), Hon Hai Precision Industry Co., Ltd.
• Inventors: Yu, Xiang, Ma, Xiao-Yong, Chen, Qi
• Primary Examiner(s): Ali, Mohammad
• Assistant Examiner(s): WHITTINGTON, ANTHONY T
• Application Number:
  US13/211,582
• Publication Number:
  US 20120265351A1
• Time in Patent Office: 1,028 Days
• Field of Search: 700/281, 703/8, 318/625
• US Class Current: 700/281
• CPC Class Codes: G05D 9/12 characterised by the use of electric means

Abstract

A switch control system for controlling an electrically conductive fluid supply to a tank, includes a detection circuit, a gate circuit, a control circuit and a switch circuit. The detection circuit detects a fluid level in the tank and outputs a voltage level signal. The gate circuit receives the voltage level signal and outputs control signals accordingly. The control circuit receives the control signals and outputs a first voltage and a second voltage accordingly. The switch circuit receives the first voltage and the second voltage and turns on and turns off the electrically conductive fluid supply to the tank in accordance with the first voltage and the second voltage.

Claims

1. A switch control system for controlling an electrically conductive fluid supply to a tank, comprising:

a detection circuit adapted to detect a fluid level in the tank and output a voltage level signal in accordance with the fluid level;

a gate circuit adapted to receive the voltage level signal and output control signals in accordance with the voltage level signal;

a control circuit adapted to receive the control signals and output a first voltage and a second voltage in accordance with the control signals;

wherein the control circuit comprises a first MOSFET and a second MOSFET; and

a switch circuit adapted to receive the first voltage and the second voltage and turn on and turn off the electrically conductive fluid supply to the tank in accordance with the first voltage and the second voltage;

wherein the switch circuit comprises a first pole, a second pole and a control valve;

a core member is installed in the control valve;

when the fluid level in the tank is higher than a threshold fluid level, the detection circuit is adapted to output a low voltage level signal;

the gate circuit output control signals to turn off the first MOSFET and turn on the second MOSFET;

the second pole is adapted to receive the second voltage from the second MOSFET;

the second pole is adapted to attract the core member moving in the control valve; and

the control valve is adapted to turn off the electrically conductive fluid supply to the tank.

2. The switch control system of claim 1, wherein the detection circuit comprises a first detecting member and a second detecting member;

the first detecting member comprises a first detecting member first terminal and a first detecting member second terminal;

the second detecting member comprises a second detecting member first terminal and a second detecting member second terminal;

the first detecting member first terminal is electrically connected to a fluid level detector in the tank;

the first detecting member second terminal is adapted to receive a DC voltage;

the second detecting member first terminal is adapted to be idled;

the second detecting member second terminal is adapted to output the voltage level signal; and

when the fluid level in the tank reaches the threshold fluid level, the first detecting member and the second detecting member are electrically connected together.

3. The switch control system of claim 2, wherein the gate circuit comprises a NAND gate chip and an AND gate chip;

the NAND gate chip comprises a NAND gate chip first input terminal, a NAND gate chip second input terminal and a NAND gate chip output terminal;

the AND gate chip comprises an AND gate chip first input terminal, an AND gate chip second input terminal and an AND gate chip output terminal;

the NAND gate chip first input terminal and the AND gate chip first input terminal are electrically connected to the first detecting member second terminal;

the NAND gate chip second input terminal and the AND gate chip second input terminal are electrically connected to the second detecting member second terminal;

the NAND gate chip second input terminal and the AND gate chip second input terminal are electrically connected and grounded; and

the NAND gate chip output terminal and the AND gate chip output terminal are adapted to output the control signals.

4. The switch control system of claim 3, wherein the first MOSFET comprises a first MOSFET gate, a first MOSFET source and a first MOSFET drain;

the second MOSFET comprises a second MOSFET gate, a second MOSFET source and a second MOSFET drain;

the first MOSFET gate is electrically connected to the NAND gate chip output terminal;

the first MOSFET drain is adapted to receive the DC voltage;

the first MOSFET source is adapted to output the first voltage;

the second MOSFET gate is electrically connected to the AND gate chip output terminal;

the second MOSFET drain is adapted to receive the DC voltage; and

the second MOSFET source outputs the second voltage.

5. The switch control system of claim 4, wherein the first pole is electrically connected to the first MOSFET source for receiving the first voltage;

the second pole is electrically connected to the second MOSFET source for receiving the second voltage; and

the first pole and the second pole are adapted to attract the core member moving in the control valve according to the first voltage and the second voltage.

6. The switch control system of claim 5, wherein when the fluid level in the tank is lower than the threshold fluid level, the detection circuit is adapted to output a high voltage level signal;

the gate circuit output control signals to turn on the first MOSFET and turn off the second MOSFET;

the first pole is adapted to receive the first voltage from the first MOSFET;

the first pole is adapted to attract the core member moving in the control valve; and

the control valve is adapted to turn on the electrically conductive fluid supply to the tank.

7. The switch control system of claim 5, wherein the first MOSFET and the second MOSFET are N-channel MOSFETs.

8. The switch control system of claim 1, wherein the control valve defines a cave therein;

the core member is installed in the cave;

a fluid inlet opening is defined in a top wall of the cave;

a fluid outlet opening is defined in a bottom wall of the cave; and

the fluid outlet opening is connected to a fluid inlet pipe of the tank.

9. The switch control system of claim 8, wherein a fluid outlet hole is defined at a bottom of the fluid inlet opening;

a restriction block is installed between the cave and the fluid outlet hole;

the restriction block comprises a columned connection portion;

a spherical first crown portion extended from a top of the columned connection portion;

a spherical second crown portion extended from a bottom of the columned connection portion;

when the second pole is adapted to attract the core member moving in the control valve, a top of the core member is adapted to resist the spherical second crown portion;

the spherical first crown portion is adapted to move toward and plug the fluid outlet hole;

when the first pole is adapted to attract the core member moving in the control valve, the top of the core member is adapted to release the spherical second crown portion;

the spherical first crown portion is adapted to move away from and separate from the fluid outlet hole.