Charging circuit
First Claim
1. A charging circuit for charging a load component, the charging circuit comprising:
- a power supply unit comprising a pulse width modulation circuit and a power output terminal configured to output a direct current supply;
a feedback circuit comprising an amplifier comparator, a constant voltage circuit, a transistor, and an optoelectrical coupler, the constant voltage circuit being configured to generate a reference voltage and apply the reference voltage to an inverting terminal of the amplifier comparator, an output terminal of the amplifier comparator being connected to a base of the transistor to control the transistor, an emitter of the transistor being grounded, a collector of the transistor being coupled to the optoelectrical coupler, the optoelectrical coupler being connected to the pulse width modulation circuit; and
a sampling resistor comprising a current sampling terminal connected to a non-inverting terminal of the amplifier comparator, and a grounded terminal, the current sampling terminal also being connected to the power output terminal via the load component;
wherein the charging circuit is configured such that when the load component is coupled to the direct current supply of the charging circuit and a direct current traveling through the load component changes, the amplifier comparator generates a feedback signal and applies the feedback signal to the pulse width modulation circuit via the transistor and the optoelectrical coupler, and the pulse width modulation circuit adjusts the direct current supply output from the power output terminal according to the feedback signal to stabilize the direct current traveling through the load component.
4 Assignments
0 Petitions
Accused Products
Abstract
An exemplary charging circuit (200) includes for charging a load component (210) includes a power supply unit (220), a feedback circuit, and a sampling resistor (230). The power supply unit includes a pulse width modulation circuit (221) and a power output terminal (222) configured to output a direct current supply. The feedback circuit includes an amplifying comparator (241), a constant voltage circuit (242), a transistor (243), and an optoelectrical coupler (244). The constant voltage circuit is configured to generate a reference voltage and apply the reference voltage to a negative input terminal of the amplifier comparator. An output terminal of the amplifier comparator is connected to the pulse width modulation circuit via the transistor and the optoelectrical coupler. The sampling resistor includes a current sampling terminal connected to a positive input terminal of the amplifier comparator.
-
Citations
20 Claims
-
1. A charging circuit for charging a load component, the charging circuit comprising:
-
a power supply unit comprising a pulse width modulation circuit and a power output terminal configured to output a direct current supply; a feedback circuit comprising an amplifier comparator, a constant voltage circuit, a transistor, and an optoelectrical coupler, the constant voltage circuit being configured to generate a reference voltage and apply the reference voltage to an inverting terminal of the amplifier comparator, an output terminal of the amplifier comparator being connected to a base of the transistor to control the transistor, an emitter of the transistor being grounded, a collector of the transistor being coupled to the optoelectrical coupler, the optoelectrical coupler being connected to the pulse width modulation circuit; and a sampling resistor comprising a current sampling terminal connected to a non-inverting terminal of the amplifier comparator, and a grounded terminal, the current sampling terminal also being connected to the power output terminal via the load component; wherein the charging circuit is configured such that when the load component is coupled to the direct current supply of the charging circuit and a direct current traveling through the load component changes, the amplifier comparator generates a feedback signal and applies the feedback signal to the pulse width modulation circuit via the transistor and the optoelectrical coupler, and the pulse width modulation circuit adjusts the direct current supply output from the power output terminal according to the feedback signal to stabilize the direct current traveling through the load component. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 19)
-
-
18. A charging circuit for charging a load component, the charging circuit comprising:
-
a power supply unit comprising a power output terminal configured to output a direct current supply and a pulse width modulation circuit configured to adjust the direct current supply to stabilize a current traveling through the load component; a feedback circuit comprising an amplifier comparator, a constant voltage circuit, a transistor, and an optoelectrical coupler, the constant voltage circuit being configured for generating a reference voltage and applying the reference voltage to an inverting terminal of the amplifier comparator, an output terminal of the amplifier comparator being connected to a base of the transistor to control the open and close states of the transistor, an emitter of the transistor being grounded, a collector of the transistor being coupled to the optoelectrical coupler, the optoelectrical coupler being connected to the pulse width modulation circuit; and a sampling resistor comprising a current sampling terminal connected to a non-inverting terminal of the amplifier comparator, the sampling resistor being configured to detect the current traveling through the load component, and feedback a detected voltage corresponding to the current to the non-inverting terminal of the amplifier comparator.
-
-
20. A charging circuit for charging a load component, the charging circuit comprising:
-
a power supply unit comprising a pulse width modulation circuit and a power output terminal configured to supply a direct current supply to a positive input terminal of the load component; a sampling resistor connected between a negative input terminal of the load component and ground, the sampling resistor being configured to detect a current flowing through the load component and generate a sampling voltage representing the current; a transistor comprising a grounded emitter, a base, and a collector connected to the power output terminal via a first resistor; an optoelectrical coupler comprising two input terminals connected to the two end terminals of the first resistor, and an output terminal connected to the pulse width modulation circuit; an amplifier comparator comprising an inverting terminal configured to receive a constant reference voltage, a non-inverting terminal configured to receive the sampling voltage from the sampling resistor, and an output terminal connected to the base of the transistor.
-
Specification