HYSTERESIS SWITCH AND ELECTRICITY CHARGING MODULE USING THE SAME

• US 20110241624A1
• Filed: 04/13/2010
• Published: 10/06/2011
• Est. Priority Date: 03/31/2010
• Status: Active Grant

• Current Assignee: Kookmin University
• Original Assignee: Kookmin University
• Inventors: PARK, Jun-seok, SEONG, Yeong-Rak, ROH, Hyoung-Hwan, OH, Ha-Ryoung, KIM, Do-won
• Granted Patent: US 8,193,775 B2
• Time in Patent Office: Days
• US Class Current: 320/134
• CPC Class Codes: H02J 2207/20 Charging or discharging characterised by the power electronics converter
• CPC Class Codes: H02J 7/00 Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• CPC Class Codes: H02J 7/345 using capacitors as storage or buffering devices
• CPC Class Codes: H02M 7/2176 comprising a passive stage to generate a rectified sinusoidal voltage and a controlled switching element in series between such stage and the output
• CPC Class Codes: H03K 17/14 Modifications for compensating variations of physical values, e.g. of temperature
• CPC Class Codes: H03K 17/145 in field-effect transistor switches

Abstract

An electricity charging module using a hysteresis switch includes a storage capacitor that preliminarily stores electrical energy supplied from an external power source, a charging unit for preventing over-charging or over-discharging through monitoring of the charging state of the rechargeable battery, and a hysteresis switch that has a larger turn-on voltage level than the turn-off voltage level, and located between the storage capacitor and the charging unit, thereby electrically connecting or disconnecting the storage capacitor with the charging unit. The hysteresis switch includes a first voltage dividing resistor pair that divides the voltage of an external power source by the resistance ratio of the first voltage dividing resistor pair, a second voltage dividing resistor pair whose one end is connected to a positive electrode terminal of the external power source, a first switching device whose control terminal is connected to the junction of the voltage dividing resistors of the second voltage dividing resistor pair, a second switching device whose control terminal is connected to the junction of the voltage dividing resistors of the first voltage dividing resistor pair, and a resistor that is connected to the junction between the first electrode terminal of the second switching device and the junction of the voltage dividing resistors of the first voltage dividing resistor pair.

Claims

1. A switch having a hysteresis characteristic comprising:

a first voltage dividing resistor pair (R1, R2) that divides the voltage of an external power source by the resistance ratio of the first voltage dividing resistor pair;

a second voltage dividing resistor pair (R3, R4) whose one end is connected to a positive electrode terminal of the external power source;

a first switching device whose control terminal is connected to the junction of the voltage dividing resistors of the second voltage dividing resistor pair (R3, R4), wherein a first electrode terminal of the first switching device is connected to the output terminal, and a second electrode terminal of the first switching device is connected to the positive electrode terminal;

a second switching device whose control terminal is connected to the junction of the voltage dividing resistors of the first voltage dividing resistor pair (R1, R2), wherein a first electrode terminal of the second switching device is connected to the other end of the second voltage dividing resistor pair (R3, R4), and a second electrode terminal of the second switching device is connected to ground; and

a resistor (R5) that is connected to the junction between the first electrode terminal of the second switching device and the junction of the voltage dividing resistors of the first voltage dividing resistor pair (R1, R2).

2. The switch having a hysteresis characteristic according to claim 1, wherein the first switching device and the second switching device are comprised of a p-channel FET and an n-channel FET respectively.

3. The switch having a hysteresis characteristic according to claim 1, wherein the first switching device and the second switching device are comprised of a pnp-type BJT and an npn-type BJT respectively.

4. The switch having a hysteresis characteristic according to claim 1, wherein the first switching device and the second switching device are comprised a p-channel HEMT and an n-channel HEMT respectively, and wherein one source terminal of each HEMT is floated.

5. An electricity charging module using a storage capacitor comprising:

a storage capacitor that preliminarily stores electrical energy supplied from an external power source;

a charging unit for preventing over-charging and optionally over-discharging through monitoring of the charging state of the rechargeable battery; and

a hysteresis switch that has a larger turn-on voltage level than the turn-off voltage level, and located between the storage capacitor and the charging unit, thereby electrically connecting or disconnecting the storage capacitor with the charging unit.

6. The electricity charging module using a storage capacitor according to claim 5, further comprising a rectifying unit in front of the storage capacitor for rectification of an A.C. component of an external power source if the external power source includes the A.C. component.

7. The electricity charging module using a storage capacitor according to claim 5, wherein the hysteresis switch comprises:

a first voltage dividing resistor pair (R1, R2) that divides the voltage of an external power source by the resistance ratio of the first voltage dividing resistor pair;

a second voltage dividing resistor pair (R3, R4) whose one end is connected to a positive electrode terminal of the external power source;

a first switching device whose control terminal is connected to the junction of the voltage dividing resistors of the second voltage dividing resistor pair (R3, R4), wherein the first electrode terminal of the first switching device is connected to the output terminal, and the second electrode terminal of the first switching device is connected to the positive electrode terminal of the storage capacitor;

a second switching device whose control terminal is connected to the junction of the voltage dividing resistors of the first voltage dividing resistor pair (R1, R2), wherein the first electrode terminal of the second switching device is connected to the other end of the second voltage dividing resistor pair (R3, R4), and the second electrode terminal of the second switching device is connected to ground; and

a resistor (R5) that is connected to the junction between the first electrode terminal of the second switching device and the junction of the voltage dividing resistors of the first voltage dividing resistor pair (R1, R2).

8. The electricity charging module using a storage capacitor according to claim 7, wherein the first switching device and second switching device comprise a p-channel FET and an n-channel FET respectively.

9. The electricity charging module using a storage capacitor according to claim 7, wherein the first switching device and second switching device comprise a pnp-type BJT and an npn-type BJT respectively.

10. The electricity charging module using a storage capacitor according to claim 7, wherein the first switching device and second switching device comprise a p-channel HEMT and an n-channel HEMT respectively, and wherein one source terminal of each HEMT is floated.

11. The electricity charging module using a storage capacitor according to claim 6, wherein a reverse current protection diode is connected between the rectifying unit and the storage capacitor.