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US 9,960,664 B2Granted
Voltage converter
AssigneeAlpha and Omega Semiconductor Incorporated
InventorsTien-Chi Lin, Yu-Ming Chen, Jung-Pei Cheng, Yung-Chuan Hsu, Yueh-Ping Yu, Wei-Ting Wang, Pei-Lun Huang
Life of this patent
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Abstract
A voltage converter comprises a second controller as a power switch of the secondary side of the transformer for comparing a detection voltage representing an output voltage and/or load current with a first reference voltage and generating a control signal, and a coupling element for transmitting the control signal generated by the second controller to the first controller on the primary side of the transformer enabling the first controller to generate a first pulse signal driving the power switch to control the on/off state of the primary side winding.
Claims15
A voltage converter comprising:
- a transformer comprising a primary winding and a secondary winding, wherein the primary winding and a master switch are connected in series between an input voltage and a ground terminal, and the secondary winding is connected between an output node for providing an output voltage to a load and a reference ground potential;
- a first controller configured to produce a first pulse signal for driving the master switch to be turned on or turned off;
- a second controller configured to compare a detection voltage representing the output voltage and/or a load current value with a first reference voltage, thus determining the logic state of a control signal generated thereof according to a comparison result signal, wherein the detection voltage is inputted at an inverting input terminal of a first comparator of the second controller while the first reference voltage is inputted at a non-inverting input terminal;
- further, when the detection voltage is lower than the first reference voltage, an RS trigger of the second controller is set by a high level comparison result signal of a first comparator, so that a control signal outputted by the RS trigger is turned from a low level to a high level;
- further, an on-time generator of the second controller starts timing from the moment that the control signal turns from the low level to the rising edge of the high level, and finishes timing when a preset on-time is ended;
- and further, when the timing is finished, a signal outputted by the on-time generator turns from the low level to the high level and resets the RS trigger, so that the control signal is turned from the high level to the low level;
- and
- a coupling element connected between the first and the second controllers for transferring the logic state of the control signal from the second controller to the first controller, so that the first controller determines the logic state of the first pulse signal according to the logic state of the control signal.
5 more elements
A voltage converter comprising:
- a transformer comprising a primary winding and a secondary winding, wherein the primary winding and a master switch are connected in series between an input voltage and a ground terminal, and the secondary winding is connected between an output node for providing an output voltage to a load and a reference ground potential, wherein the transformer further comprises an auxiliary winding having the same winding direction as the secondary winding, a diode is connected between one end of the auxiliary winding and one end of an auxiliary capacitor, the other ends of the auxiliary winding and the auxiliary capacitor are connected to the ground terminal;
- when a current passes through the secondary winding, the diode between the secondary winding and the auxiliary capacitor is positively turned on and a current flowing through the auxiliary winding charges the auxiliary capacitor, and the auxiliary capacitor provides a power supply voltage to the first controller;
- a first controller configured to produce a first pulse signal for driving the master switch to be turned on or turned off;
- a second controller configured to compare a detection voltage representing the output voltage and/or a load current value with a first reference voltage, thus determining the logic state of a control signal generated thereof according to a comparison result signal;
- and
- a coupling element connected between the first and the second controllers for transferring the logic state of the control signal from the second controller to the first controller, so that the first controller determines the logic state of the first pulse signal according to the logic state of the control signal.
3 more elements
A voltage converter comprising:
- a transformer comprising a primary winding and a secondary winding, wherein the primary winding and a master switch are connected in series between an input voltage and a ground terminal, and the secondary winding is connected between an output node for providing an output voltage to a load and a reference ground potential;
- a first controller configured to produce a first pulse signal for driving the master switch to be turned on or turned off;
- a second controller configured to compare a detection voltage representing the output voltage and/or a load current value with a first reference voltage, thus determining the logic state of a control signal generated thereof according to a comparison result signal;
- a coupling element connected between the first and the second controllers for transferring the logic state of the control signal from the second controller to the first controller, so that the first controller determines the logic state of the first pulse signal according to the logic state of the control signal;
- a voltage divider that captures one voltage division value the output voltage at the output node and a sensing resistor, wherein the sensing resistor is serially connected with the load between the output node and the reference ground potential, and the voltage drop at two ends of the sensing resistor is taken as the sensing voltage which represents the value of the load current;
- a filter, wherein the filter is used for filtering off a direct current component in the feedback voltage but maintaining the voltage of an alternating current component;
- an adder;
- and
- an amplifier, wherein the amplifier is used for amplifying the sensing voltage, and the voltage of the alternating current component outputted by the filter and an amplification voltage of the sensing voltage outputted by the amplifier are combined in the adder and then used as the detection voltage.
6 more elements
Dependencies are inferred from the claim text.