Abstract: A switch transistor protection device includes a voltage/current detection device and a determination device. The voltage/current detection device is electrically connected to a switch transistor, and used to detect a voltage of the gate, the body, the source or the drain of the switch transistor, or used to detect a current of the source or the drain of the switch transistor to generate a reference voltage. The determination device is electrically connected to the voltage/current detection device and the switch transistor, and used to determine whether the reference voltage exceeds an overcurrent voltage or a fixed maximum junction temperature voltage corresponding to a maximum junction temperature of the switch transistor. When the determination device determines the reference voltage exceeds the maximum junction temperature voltage or the overcurrent voltage, the determination device generates a control signal to the gate, the body, the source or the drain of the switch transistor.

Abstract: A power limiting circuit is provided to control operation power of a power device during operation. The power limiting circuit includes a detection circuit and a control circuit. The detection circuit is coupled to the power device. The detection circuit is configured to detect a cross voltage between an input terminal and an output terminal of the power device and generate at least one detection signal associated with the detected cross voltage. The control circuit is coupled to the detection circuit and the power device. The control circuit is configured to generate a control signal based on the at least one detection signal. The control signal is provided to enable or disable the power device to control the operation power of the power device.

Abstract: A band gap reference voltage generating circuit includes a reference voltage generating circuit, a current generating circuit, a current divider circuit, and a first connection path switching circuit. The reference voltage generating circuit forms a reference voltage on first and second current input terminals thereof. First and second input terminals of the current generating circuit are connected to the first and second current input terminals, respectively. The current generating circuit generates a first current to bias the reference voltage generating circuit. The current divider circuit includes a current input terminal, a first current output terminal, and a second current output terminal. The first connection path switching circuit switches connection paths between the first input terminal and the second input terminal of the current generating circuit, and the first current input terminal and the second current input terminal of the current divider circuit.

Abstract: A band gap reference voltage generating circuit includes a reference voltage generating circuit, a current generating circuit, a current divider circuit, and a first connection path switching circuit. The reference voltage generating circuit forms a reference voltage on first and second current input terminals thereof. First and second input terminals of the current generating circuit are connected to the first and second current input terminals, respectively. The current generating circuit generates a first current to bias the reference voltage generating circuit. The current divider circuit includes a current input terminal, a first current output terminal, and a second current output terminal. The first connection path switching circuit switches connection paths between the first input terminal and the second input terminal of the current generating circuit, and the first current input terminal and the second current input terminal of the current divider circuit.

Abstract: A band gap reference voltage generating circuit includes a reference voltage generating circuit, a current generating circuit, a current divider circuit, and a first connection path switching circuit. The reference voltage generating circuit forms a reference voltage on first and second current input terminals thereof. First and second input terminals of the current generating circuit are connected to the first and second current input terminals, respectively. The current generating circuit generates a first current to bias the reference voltage generating circuit. The current divider circuit includes a current input terminal, a first current output terminal, and a second current output terminal. The first connection path switching circuit switches connection paths between the first input terminal and the second input terminal of the current generating circuit, and the first current input terminal and the second current input terminal of the current divider circuit.

Abstract: A band gap reference voltage generating circuit includes a reference voltage generating circuit, a current generating circuit, a current divider circuit, and a first connection path switching circuit. The reference voltage generating circuit forms a reference voltage on first and second current input terminals thereof. First and second input terminals of the current generating circuit are connected to the first and second current input terminals, respectively. The current generating circuit generates a first current to bias the reference voltage generating circuit. The current divider circuit includes a current input terminal, a first current output terminal, and a second current output terminal. The first connection path switching circuit switches connection paths between the first input terminal and the second input terminal of the current generating circuit, and the first current input terminal and the second current input terminal of the current divider circuit.

Abstract: A current-limited level shift circuit comprises a first PMOS transistor, a second PMOS transistor, a third PMOS transistor, a fourth PMOS transistor, a first current-limiting unit, a second current-limiting unit, a first NMOS transistor and a second NMOS transistor, for providing a pair of input terminals and three pairs of output terminals outputting level shift signals. The first current-limiting unit is connected between the third output terminal and the fifth output terminal, and the second current-limiting unit is connected between the fourth output terminal and the sixth output terminal, for providing the current limiting of state transition. The pair of the first output terminal and the second output terminal, the pair of the third output terminal and the fourth output terminal, and the pair of the fifth output terminal and the sixth output terminal are selectively for providing multiple choices to the second stage.

Abstract: A microprocessor locking circuit for use in a microprocessor comprising at least one program code is provided. The microprocessor locking circuit includes a predetermined key, wherein the microprocessor locking circuit receives an input key and compares the input key with the predetermined key after a reset period starts, wherein the program code is unlocked if the input key is identical to the predetermined key, and the program code is locked if the input key is different from the predetermined key.

Abstract: An integrated circuit is provided. The integrated circuit includes N level shifting devices. Each level shifting device receives a first digital signal and a second digital signal, and includes a first level shifter converting a first voltage of the first digital signal into a third voltage and converting a second voltage of the first digital signal into a fourth voltage, and a second level shifter converting a first voltage of the second digital signal into a fifth voltage and converting a second voltage of the second digital signal into a sixth voltage.

Abstract: A method of power control apparatus for electric cookers is provided. In the method, a micro controller unit (MCU) with a programmer pulse generator (PPG) and analog/digital (AID) converters is utilized, wherein a command can be inputted externally to the MCU for restarting or stopping the output of the PPG; and the PPG is capable of outputting pulses of programmable pulse width, being programmed by software for power control and, also, the protection of power control apparatus.

Abstract: A power control apparatus for electric cookers includes an input unit, an output unit, a micro controller unit (MCU), having a programmer pulse generator (PPG) and at least an analog/digital converter built therein, a power circuit, an exciter-coil circuit, an output circuit of insulated gate bipolar transistor (IGBT), and a drive circuit of insulated gate bipolar transistor (IGBT). A command can be inputted externally to the MCU for restarting or stopping the output of the PPG and the PPG is capable of outputting pulses of programmable pulse width.

Abstract: A power control apparatus for electric cookers is disclosed, which comprises: an input unit, for setting parameters of temperature control, power control and timing control, etc.; an output unit, for displaying parameters of temperature, power and timing, etc.

Abstract: In the present invention, a temperature compensation circuit is provided. The temperature compensation circuit includes a first oscillator for providing a first clock signal, a timer electrically connected to the first oscillator for clocking a specific time period, a voltage regulator for generating a constant voltage, a second oscillator electrically connected to the voltage regulator for providing a second clock signal, and a counter electrically connected to the second oscillator for counting within the specific time period based on the second clock signal so as to obtain a counting value, and thereby a frequency of the second oscillator is obtained for the temperature compensation.

Abstract: A power control apparatus for electric cookers is disclosed, which comprises: an input unit, for setting parameters of temperature control, power control and timing control, etc.; an output unit, for displaying parameters of temperature, power and timing, etc.

Abstract: In the present invention, a temperature compensation circuit is provided. The temperature compensation circuit includes a first oscillator for providing a first clock signal, a timer electrically connected to the first oscillator for clocking a specific time period, a voltage regulator for generating a constant voltage, a second oscillator electrically connected to the voltage regulator for providing a second clock signal, and a counter electrically connected to the second oscillator for counting within the specific time period based on the second clock signal so as to obtain a counting value, and thereby a frequency of the second oscillator is obtained for the temperature compensation.