Abstract: A voltage conversion circuit and a non-isolated power supply system are provided. The voltage conversion circuit includes: a switching power supply chip which includes a power MOS transistor and a driving circuit, where the driving circuit is adapted to drive the power MOS transistor; and a driving circuit power supply unit which includes a boost unit, wherein when an output voltage of the boost unit is less than a working voltage of the driving circuit, an internal power supply of the switching power supply chip provides the working voltage for the driving circuit; and when the output voltage of the boost unit reaches the working voltage of the driving circuit, the output voltage of the boost unit provides the working voltage for the driving circuit.

Abstract: An internal power generation circuit comprises: a first internal power generation circuit, configured to generate a first power signal based on an external power signal, and including an NMOS transistor, voltage of the first power signal being lower than voltage of the external power signal by threshold voltage of one NMOS transistor, wherein the circuit further includes: a booster unit performing boosting on the first power signal, voltage of a boosted signal being higher than the voltage of the first power signal by at least the threshold voltage of one NMOS transistor; a self-starting feedback circuit configured to generate an output voltage signal based on the boosted signal and the external power signal, wherein before the output voltage signal reaches a target voltage, the output voltage signal follows the external power signal, and after the output voltage signal reaches the target voltage, the output voltage signal holds the target voltage.

Abstract: A power supply control circuit for a switch mode power supply converter, and a power supply control method using the control circuit. The control circuit includes an auxiliary boosting unit, a main control unit and an auxiliary winding unit. The main control unit is configured to control the power switch in a power stage circuit to turn on or to be off, and to supply power to the auxiliary boosting unit. The auxiliary boosting unit is configured to provide auxiliary power for the main control unit, and to self-adaptively adjust the auxiliary boosting unit's own average switching frequency based on a load state of the main control unit. The auxiliary winding unit is configured to couple energy by means of a magnetic element in the power stage circuit, to generate an output voltage.

Abstract: A voltage detection circuit, a power supply system and a chip are provided. The voltage detection circuit includes: a first step-down sub-circuit, a second step-down sub-circuit and a first voltage-stabilizing sub-circuit; wherein the first step-down sub-circuit has one end connected to one end of the second step-down sub-circuit in series; the first step-down sub-circuit has another end connected to a first port of the voltage detection circuit; and the second step-down sub-circuit has another end connected to a second port of the voltage detection circuit; and wherein the first voltage-stabilizing sub-circuit has one end connected to a third port of the voltage detection circuit and has another end connected to the second port, where the first voltage-stabilizing sub-circuit is turned on when the third port has a voltage higher than the second port and stabilized when the third port has a voltage lower than the second port.

Abstract: A voltage detection circuit, a power supply system and a chip are provided. The voltage detection circuit includes: a first step-down sub-circuit, a second step-down sub-circuit and a first voltage-stabilizing sub-circuit; wherein the first step-down sub-circuit has one end connected to one end of the second step-down sub-circuit in series; the first step-down sub-circuit has another end connected to a first port of the voltage detection circuit; and the second step-down sub-circuit has another end connected to a second port of the voltage detection circuit; and wherein the first voltage-stabilizing sub-circuit has one end connected to a third port of the voltage detection circuit and has another end connected to the second port, where the first voltage-stabilizing sub-circuit is turned on when the third port has a voltage higher than the second port and stabilized when the third port has a voltage lower than the second port.

Abstract: A voltage conversion circuit and a non-isolated power supply system are provided. The voltage conversion circuit includes: a switching power supply chip which includes a power MOS transistor and a driving circuit, where the driving circuit is adapted to drive the power MOS transistor; and a driving circuit power supply unit which includes a boost unit, wherein when an output voltage of the boost unit is less than a working voltage of the driving circuit, an internal power supply of the switching power supply chip provides the working voltage for the driving circuit; and when the output voltage of the boost unit reaches the working voltage of the driving circuit, the output voltage of the boost unit provides the working voltage for the driving circuit.

Abstract: A vertical lighting vaneless inverter fan comprises a body, a blast system, an air supply column, a lighting device and a sound-reducing structure. The blast system is mounted in the inner chamber of body. The air supply column is installed on the top of body. The blast system supplies air to the air supply column, the airflow is jetted from the air supply column. The impeller is located above the motor. When the blast system is installed in the inner chamber of body case, the impeller corresponds to the bottom of air outlet, so that the wind can be delivered through the air outlet directly.

Abstract: A circuit for controlling a switching power supply and a method for controlling a switching power supply by using the circuit for controlling the switching power supply, the circuit for controlling a switching power supply is configured to control a power stage circuit of a converter of the switching power supply. The circuit for controlling the switching power supply includes an external magnetic field direct detection unit, a current limit threshold unit, an operating frequency unit, a pulse width unit and a logic unit. The external magnetic field direct detection unit includes a Hall device and a Hall detection component. In accordance with the circuit for controlling the switching power supply of the present disclosure, the intensity of the external magnetic field can be detected directly at the chip level, and the operating mode of the switching power supply system can be adjusted timely.

Abstract: A power supply control circuit for a switch mode power supply converter, and a power supply control method using the control circuit. The control circuit includes an auxiliary boosting unit, a main control unit and an auxiliary winding unit. The main control unit is configured to control the power switch in a power stage circuit to turn on or to be off, and to supply power to the auxiliary boosting unit. The auxiliary boosting unit is configured to provide auxiliary power for the main control unit, and to self-adaptively adjust the auxiliary boosting unit's own average switching frequency based on a load state of the main control unit. The auxiliary winding unit is configured to couple energy by means of a magnetic element in the power stage circuit, to generate an output voltage.

Abstract: A circuit for controlling a switching power supply and a method for controlling a switching power supply by using the circuit for controlling the switching power supply, the circuit for controlling a switching power supply is configured to control a power stage circuit of a converter of the switching power supply. The circuit for controlling the switching power supply includes an external magnetic field direct detection unit, a current limit threshold unit, an operating frequency unit, a pulse width unit and a logic unit. The external magnetic field direct detection unit includes a Hall device and a Hall detection component. In accordance with the circuit for controlling the switching power supply of the present disclosure, the intensity of the external magnetic field can be detected directly at the chip level, and the operating mode of the switching power supply system can be adjusted timely.

Abstract: A vertical lighting vaneless inverter fan comprises a body, a blast system, an air supply column, a lighting device and a sound-reducing structure. The blast system is mounted in the inner chamber of body. The air supply column is installed on the top of body. The blast system supplies air to the air supply column, the airflow is jetted from the air supply column. The impeller is located above the motor. When the blast system is installed in the inner chamber of body case, the impeller corresponds to the bottom of air outlet, so that the wind can be delivered through the air outlet directly.

Abstract: A highly integrated switching power supply and a control circuit are provided. The switching power supply includes a transformer, the transformer comprises a primary winding, a secondary winding and an auxiliary winding, and the control circuit includes: a power switch transistor, configured to control disconnection and conduction of the primary winding of the transformer; a primary current sampling module, configured to sample a current of the primary winding to generate a sampling voltage; and a voltage stabilization control module, configured to turn on or turn off the power switch transistor according to an input voltage, an output voltage of the switching power supply system, and the sampling voltage.

Abstract: A highly integrated switching power supply and a control circuit are provided. The switching power supply includes a transformer, the transformer comprises a primary winding, a secondary winding and an auxiliary winding, and the control circuit includes: a power switch transistor, configured to control disconnection and conduction of the primary winding of the transformer; a primary current sampling module, configured to sample a current of the primary winding to generate a sampling voltage; and a voltage stabilization control module, configured to turn on or turn off the power switch transistor according to an input voltage, an output voltage of the switching power supply system, and the sampling voltage.

Abstract: A control circuit and a control method of a switching power supply, according to feedback signals on a pin FB and a pin CS, a constant current control module generates and outputs a control signal to control an output current of the switching power supply, thereby regulating duty cycle of a first transistor adaptively and controlling an output current Io of a power supply system to be constant; according to the feedback signals on the pin FB and on the pin CS, a constant current precision compensation module adaptively regulates circuit parameters of the constant current control module and a sample-and-hold module, preventing precision of constant current output from being influenced by change of a working mode and/or by variation of input conditions; when an output voltage changes, QR mode keeps unchanged or depth of a CCM keeps approximately constant.

Abstract: A primary controller of a switching power supply and the switching power supply are provided. The primary controller includes an input voltage detection module which receives a detected signal and generates a detection signal; a controller module which receives a feedback signal and a current sampling signal of the switching power supply, and generates a control signal according to the feedback signal and the current sampling signal; a PWM signal generation module, receive the detection signal and the control signal, generate a PWM signal according to the control signal when the detection signal is the second level, and stop generating the PWM signal when the detection signal is the first level; and a power switch transistor, having a control terminal coupled with an output terminal of the PWM signal generation module.

Abstract: What disclosed are a control circuit and a control method of a switching power supply, according to feedback signals on a pin FB and a pin CS, a constant current control module generates and outputs a control signal to control an output current of the switching power supply, thereby regulating duty cycle of a first transistor adaptively and controlling an output current Io of a power supply system to be constant; according to the feedback signals on the pin FB and on the pin CS, a constant current precision compensation module adaptively regulates circuit parameters of the constant current control module and a sample-and-hold module, preventing precision of constant current output from being influenced by change of a working mode and/or by variation of input conditions; when an output voltage changes, QR mode keeps unchanged or depth of a CCM keeps approximately constant.

Abstract: Disclosed is a high voltage power system with enable control, comprising a high voltage start-up circuit, a PWM control module, and a driving module; the high voltage start-up circuit comprises a first transistor, a third transistor, a fourth transistor, a resistor, a diode, a VDD detection unit and an I/O interface unit; the high voltage start-up circuit is controlled by an input of a pin EN; when the pin EN is set, the high voltage start-up circuit stops working; the power system is shut off and doesn't restart, and enters a zero standby state; when the pin EN is reset, the high voltage start-up circuit restores to work, and the power system restarts and enters a normal working state. The power system having the high voltage start-up circuit with enable control has characteristics that the standby input power consumption and standby input current are both close to zero.

Abstract: Disclosed are a control method and a control circuit for a switching power supply, said switching power supply comprises a secondary side controller and a secondary side MOS transistor connected between a load and a secondary side winding of a transformer. The present invention is used for detecting a working state of the secondary side winding of a transformer and a type of a communication signal transmitted by a load, and for generating a switching pulse signal VG in a Reset Time interval of an on/off cycle according to the type of the communication signal; the primary side controller detects a variation amplitude of the transiently varied signal of the voltage drop at the pin feedback (FB) in the Reset Time interval; if the variation amplitude of the transiently varied signal is greater than a pre-set value ?Vref, the primary side controller judges that the signal is a communication signal, and records the communication signal.

Abstract: A switching power supply is provided which includes: an output port; a transformer; a first voltage divider circuit, configured to divide a feedback voltage to obtain a first divided voltage; and a primary controller, configured to control a current of the primary winding of the transformer; where the primary controller includes: a first comparison module, configured to compare the first divided voltage with a first reference voltage to obtain a first comparison result; a second comparison module, configured to compare the power supply voltage with a second reference voltage to obtain a second comparison result; and an open circuit protection module, configured to generate an open circuit protection signal, where the primary controller is configured to stop control of the primary winding in response to the open circuit protection signal. The present disclosure can efficiently detect disconnection of the up-sampling resistor of the switching power supply and provide open-circuit protection.

Abstract: Disclosed is a short-circuit protection circuit for a voltage sampling resistor of a primary side converter, comprising a high voltage power transistor, a high voltage starting resistor, a first voltage dividing resistor of a port VDD, a second voltage dividing resistor of the port VDD, an NMOS transistor, a diode, a first comparator, a second comparator, a third comparator, a time delay circuit, a filter, a first logic circuit, a second logic circuit, a current supply, a first AND gate and a first inverter. The chip of the present disclosure is capable of correctly and effectively detecting whether the sampling resistor is shorted or not before the chip works normally, thereby avoiding the risk of damaging the chip by large current from the voltage feedback port FB due to turn-on of the switching transistor when the upper voltage sampling resistor is shorted, and greatly reducing the input power.