Constant current regulator with current sensing circuit loop
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G05F-001/40
G05F-001/10
출원번호
UP-0907545
(2007-10-15)
등록번호
US-7652462
(2010-02-24)
우선권정보
TW-96131569 A(2007-08-24)
발명자
/ 주소
Wang, Ming-Chia
Chu, Hung-Chi
Shen, Yuhren
출원인 / 주소
Vastview Technology, Inc.
대리인 / 주소
Rosenberg, Klein & Lee
인용정보
피인용 횟수 :
1인용 특허 :
5
초록▼
A constant current regulator includes a current sensing circuit loop connected to a switch unit of the constant current regulator to detect a current flowing through the switch unit and to generate a detection current that is in proportion to the current flowing through the switch unit. The detectio
A constant current regulator includes a current sensing circuit loop connected to a switch unit of the constant current regulator to detect a current flowing through the switch unit and to generate a detection current that is in proportion to the current flowing through the switch unit. The detection current flows through a detection resistor to induce a detection voltage. A differential amplifier bases on a set voltage and the received detection voltage to generate an error voltage to a pulse width modulation controller, which in turn causes a gate driver circuit to control the switching operation of the switch unit thereby supplying a constant current to a load connected to an output voltage of the regulator.
대표청구항▼
What is claimed is: 1. A constant current regulator, comprising: a switch unit having a first terminal connected to an input voltage and a second terminal connected via an inductor to an output voltage; a gate driver circuit connected to a gate of the switch unit; a pulse width modulation controlle
What is claimed is: 1. A constant current regulator, comprising: a switch unit having a first terminal connected to an input voltage and a second terminal connected via an inductor to an output voltage; a gate driver circuit connected to a gate of the switch unit; a pulse width modulation controller connected to the gate driver circuit and having an error signal input terminal; a current sensing circuit loop connected to the switch unit to detect a current flowing through the switch unit and generate a detection current that is in proportion to the current flowing through the switch unit by a given ratio, the detection current being applied through a detection resistor to induce a detection voltage; and a differential amplifier having a set voltage input terminal, a detection voltage input terminal, and a differential signal output terminal, the set voltage input terminal being connected to a set voltage, the detection voltage input terminal being connected to the detection resistor to receive the detection voltage; wherein the differential amplifier bases on the set voltage and the received detection voltage to generate an error voltage at the differential signal output terminal thereof, the error voltage being applied to the pulse width modulation controller, which in turn causes the gate driver circuit to generate a switching control signal to control the switch unit, thereby supplying a constant current to a load connected to the output voltage. 2. The constant current regulator as claimed in claim 1, wherein the load comprises a light-emitting diode array that comprises a number of light-emitting diodes connected in series. 3. The constant current regulator as claimed in claim 1, wherein the current sensing circuit loop comprises: a current setting circuit, which receives a working voltage from the input voltage and comprises an adjustable current source and a serially connected resistor, so that when a current from the adjustable current source flows through the resistor, the set voltage is induced across the resistor; and a current detection circuit, which receives a working voltage from the input voltage and comprises the detection resistor through which the detection current flows. 4. The constant current regulator as claimed in claim 3, wherein the detection voltage generated by the current detection circuit is applied to a half-cycle compensation circuit to generate a half-cycle compensated detection voltage, which is applied to the detection voltage input terminal of the differential amplifier. 5. The constant current regulator as claimed in claim 4, wherein the half-cycle compensation circuit comprises a coupler, a half-cycle compensation switch unit, and a capacitor, wherein the coupler receives the detection voltage from the current detection circuit and the half-cycle compensation switch unit has a gate connected to the gate driver circuit to be controlled by the switching control signal generated by the gate driver circuit, the switch unit having a source connected to the capacitor. 6. A constant current regulator, comprising: a switch unit having a first terminal connected via an inductor to an input voltage and further connected via a diode to an output voltage and a second terminal grounded; a gate driver circuit connected to a gate of the switch unit; a pulse width modulation controller connected to the gate driver circuit and having an error signal input terminal; a current sensing circuit loop connected to the switch unit to detect a current flowing through the switch unit and generate a detection current that is in proportion to the current flowing through the switch unit by a given ratio, the detection current being applied through a detection resistor to induce a detection voltage; and a differential amplifier having a set voltage input terminal, a detection voltage input terminal, and a differential signal output terminal, the set voltage input terminal being connected to a set voltage, the detection voltage input terminal being connected to the detection resistor to receive the detection voltage; wherein the differential amplifier bases on the set voltage and the received detection voltage to generate an error voltage at the differential signal output terminal thereof, the error voltage being applied to the pulse width modulation controller, which in turn causes the gate driver circuit to generate a switching control signal to control the switch unit, thereby supplying a constant current to a load connected to the output voltage. 7. The constant current regulator as claimed in claim 6, wherein the load comprises a light-emitting diode array that comprises a number of light-emitting diodes connected in series. 8. The constant current regulator as claimed in claim 6, wherein the current sensing circuit loop comprises: a current setting circuit, which receives a working voltage from the input voltage and comprises an adjustable current source and a serially connected resistor, so that when a current from the adjustable current source flows through the resistor, the set voltage is induced across the resistor; and a current detection circuit, which receives a working voltage from the input voltage and comprises the detection resistor through which the detection current flows. 9. The constant current regulator as claimed in claim 8, wherein the detection voltage generated by the current detection circuit is applied to a half-cycle compensation circuit to generate a half-cycle compensated detection voltage, which is applied to the detection voltage input terminal of the differential amplifier. 10. The constant current regulator as claimed in claim 9, wherein the half-cycle compensation circuit comprises a coupler, a half-cycle compensation switch unit, and a capacitor, wherein the coupler receives the detection voltage from the current detection circuit and the half-cycle compensation switch unit has a gate connected to the gate driver circuit to be controlled by the switching control signal generated by the gate driver circuit, the switch unit having a source connected to the capacitor. 11. A constant current regulator, comprising: a first switch unit having a first terminal connected via an inductor to an input voltage and a second terminal grounded; a second switch unit having a first terminal connected to the first terminal of the first switch unit and a second terminal connected to an output voltage; a gate driver circuit connected to a gate of the first switch unit and a gate of the second switch unit to control the first and second switch units via a first and a second switching control signals respectively; a pulse width modulation controller connected to the gate driver circuit and having an error signal input terminal; a current sensing circuit loop connected to the first and second switch units to detect a current flowing through the second switch unit and generate a detection current that is in proportion to the current flowing through the second switch unit by a given ratio, the detection current being applied through a detection resistor to induce a detection voltage; a half-cycle compensation circuit connected to the detection resistor of the current sensing circuit loop to receive the detection voltage generated by the detection resistor and generating a half-cycle compensated detection voltage; and a differential amplifier having a set voltage input terminal, a detection voltage input terminal, and a differential signal output terminal, the set voltage input terminal being connected to a set voltage, the detection voltage input terminal being connected to the half-cycle compensation circuit to receive the half-cycle compensated detection voltage; wherein the differential amplifier bases on the set voltage and the received half-cycle compensated detection voltage to generate an error voltage at the differential signal output terminal thereof, the error voltage being applied to the pulse width modulation controller, which in turn causes the gate driver circuit to generate the first and second switching control signals to respectively control the first and second switch units thereby supplying a constant current to a load connected to the output voltage. 12. The constant current regulator as claimed in claim 11, wherein the load comprises a light-emitting diode array that comprises a number of light-emitting diodes connected in series. 13. The constant current regulator as claimed in claim 11, wherein the current sensing circuit loop comprises: a current setting circuit, which receives a working voltage from the input voltage and comprises an adjustable current source and a serially connected resistor, so that when a current from the adjustable current source flows through the resistor, the set voltage is induced across the resistor; and a current detection circuit, which receives a working voltage from the input voltage and comprises the detection resistor through which the detection current flows. 14. The constant current regulator as claimed in claim 11, wherein the half-cycle compensation circuit comprises a coupler, a half-cycle compensation switch unit, and a capacitor, wherein the coupler receives the detection voltage from the current detection circuit and the half-cycle compensation switch unit has a gate connected to the gate driver circuit to be controlled by the second switching control signal generated by the gate driver circuit, the switch unit having a source connected to the capacitor. 15. A constant current regulator, comprising: a first switch unit having a first terminal connected via an inductor to an input voltage and a second terminal grounded; a second switch unit having a first terminal connected to the first terminal of the first switch unit and a second terminal connected to an output voltage; a gate driver circuit connected to a gate of the first switch unit and a gate of the second switch unit to control the first and second switch units via a first and a second switching control signals respectively; a pulse width modulation controller connected to the gate driver circuit and having an error signal input terminal; a current sensing circuit loop connected to the first and second switch units to detect currents flowing through the first and second switch units and generate a detection current that is in proportion to a current flowing through the first and second switch units by a given ratio, the detection current being applied through a detection resistor to induce a detection voltage; a differential amplifier having a set voltage input terminal, a detection voltage input terminal, and a differential signal output terminal, the set voltage input terminal being connected to a set voltage, the detection voltage input terminal being connected to the detection resistor; wherein the differential amplifier bases on the set voltage and the detection voltage to generate an error voltage at the differential signal output terminal thereof, the error voltage being applied to the pulse width modulation controller, which in turn causes the gate driver circuit to generate the first and second switching control signals to respectively control the first and second switch units, thereby supplying a constant current to a load connected to the output voltage. 16. The constant current regulator as claimed in claim 15, wherein the load comprises a light-emitting diode array that comprises a number of light-emitting diodes connected in series. 17. The constant current regulator as claimed in claim 15, wherein the current sensing circuit loop comprises: a current setting circuit, which receives a working voltage from the input voltage and comprises an adjustable current source and a serially connected resistor, so that when a current from the adjustable current source flows through the resistor, the set voltage is induced across the resistor; and a current detection circuit, which receives a working voltage from the input voltage and comprises the detection resistor through which the detection current flows.
Kesler Scott Birk ; Long Jerral Alan, Circuitry for maintaining a substantially constant sense current to load current ratio through an electrical load driving device.
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