Abstract: The present invention provides a control method and a control circuit for a switch circuit and a corresponding switch circuit device. The control circuit comprises: an acquiring module, configured to acquire first time; a comparing module, connected with the acquiring module and configured to compare first time with first fixed time; and an adjusting module, connected with the comparing module. The adjusting module adjusts a cycle of a turn-on signal of a first switch transistor to second fixed time when the first time is less than the first fixed time. The adjusting module adjusts the sum of second time and the first fixed time to the second fixed time to achieve spread spectrum when the first time is more than the first fixed time. The control circuit for the switch circuit provided by the present invention is used for controlling the switch circuit for spread spectrum.

Abstract: The present invention discloses an isolated switch-mode power supply, a control circuit and a control method thereof. The main power transistor and the synchronous rectifier transistor are connected respectively to the primary-side winding and secondary-side winding of the isolated switch-mode power supply. The voltage of the control terminal of the main power transistor starts to increase, the main power transistor is turned on gradually, the current flowing through the main power transistor starts to increase until reaches the predetermined current-limiting value; the current of the main power transistor is maintained at the current-limiting value by controlling the voltage of the control terminal of the main power transistor; the secondary-side synchronous rectifier transistor is turned off, the current of the main power transistor decreases from the current-limiting value to the normal operation value, and the main power transistor is completely in an ON condition.

Abstract: For controlling a switch power supply, an adjustment module produces a first control voltage by comparing a period of a switch signal with a reference period. A current source module generates a first charging current according to the first control voltage. A pulse signal generating module converts the first charging current into an on time signal or off time signal of a switch transistor. A driving module produces the switch signal according to the on time or off time signal of the switching transistor, so as to control the turn on and turn off signal of a switching transistor. A time measurement module obtains a time parameter according to the switch signal, and generates a periodic adjustment signal according to the time parameter. The adjustment module adjusts the reference period according to the periodic adjustment signal to adjust the period of the switch signal.

Abstract: This invention provides a switch control circuit and a switch circuit. When a main transistor on-time reaches a constant on-time, whether an inductor current reaches an instruction current is detected; if the inductor current fails to reach the instruction current, the main transistor on-time is prolonged; the main transistor is turned off and the auxiliary transistor is turned on until the inductor current reaches the instruction current or exceeds the instruction current by a certain threshold; when the main transistor is turned off and the auxiliary transistor is turned on, the inductor current is detected in real time to check whether the inductor current is smaller than the instruction current, and the auxiliary transistor is turned off and the main transistor is turned on again if yes.

Abstract: The present invention provides an active-clamp flyback circuit and a control method thereof. The active-clamp flyback circuit includes a flyback switching power supply, and further includes a first capacitor and a first switch tube. One end of the first capacitor is connected with a high potential end of an input power supply, the other end is connected with a first end of the first switch tube, and a second end of the first switch tube is connected with a common end of the main power switch tube and the primary winding. A turn-off moment of the first switch tube is adjusted according to time when the main power switch tube is turned on and the first switch tube is turned off and voltages at both ends of the magnetizing inductor. The present invention can reduce the turn-on loss of the main power switch tube.

Abstract: The present invention discloses a bleeder circuit; solutions of the present invention may be applied in linear driving and switch driving solutions; a threshold voltage is a zero crossing value, and when the input voltage is zero crossing, the load current at this time is zero; a bleeder current is generated to make the input current greater than a holding current of a TRIAC dimmer, to maintain turning-on of the TRIAC dimmer, and a second time is set as a delay time, which reduces power consumption. In the application of switch driving solution, the current regulating circuit is controlled to be enabled according to the waveform features of the previous and latter halves of periods of the sine wave as well as the size of the input current of the driving circuit.

Abstract: The present disclosure discloses a bleeder circuit and a control method thereof, and an LED control circuit. The present disclosure is applied in an LED control circuit of TRIAC dimming, directly or indirectly detects cross-zero point of input voltage; after cross-zero point of the input voltage is delayed by a second time, the bleeder module works to generate bleeder current, and a time between turn-on time of the TRIAC and a time that a driving circuit input current achieves a predetermined value (maintaining current of TRIAC) is a first time. During the first time, the bleeder circuit generates losses; when the first time is greater than a predetermined value, the second time is prolonged; when the first time is smaller than the predetermined value, the second time is reduced, such that the first time is close to or equal to the predetermined value.

Abstract: The present invention provides an isolating switch circuit and a control method. The present invention takes first time information as a characteristic to control and adjust primary and secondary sides The primary side identifies the first time information by detecting the voltage between two ends of a main power switch transistor, and the secondary side compares a sampling output voltage or/and output current with a corresponding reference signal to obtain a first control signal representing the first time information. The present invention does not need to use the optical coupler to carry out isolated transmission of primary and secondary signals, which reduces the cost of the circuit, and the freewheeling time of a parasitic diode of a synchronous rectification transistor is taken as a characteristic to carry out identifying and controlling, such that power consumption is low and the control and adjustment is more precisely.

Abstract: A general control circuit for active balance comprises a first sampling wire (11) and a second sampling wire (12) by which voltages of adjacent battery packs (4) are sampled respectively. A first voltage division circuit which is composed of a fourth resistor (R4) and a fifth resistor (R5) connected in series, is connected to the first sampling wire. The voltage division terminal (p) of the first voltage division circuit is connected to one input terminal of a first operational amplifier (U1) and one input terminal of a second operational amplifier (U2) to provide a reference voltage (Vref) for the first operational amplifier and the second operational amplifier. A second voltage division circuit which is composed of a first resistor (R1), a second resistor (R2) and a third resistor (R3) connected in series, is connected to the second sampling wire.

Abstract: The present invention provides an isolating switch circuit and a control method. The present invention takes first time information as a characteristic to control and adjust primary and secondary sides The primary side identifies the first time information by detecting the voltage between two ends of a main power switch transistor, and the secondary side compares a sampling output voltage or/and output current with a corresponding reference signal to obtain a first control signal representing the first time information. The present invention does not need to use the optical coupler to carry out isolated transmission of primary and secondary signals, which reduces the cost of the circuit, and the freewheeling time of a parasitic diode of a synchronous rectification transistor is taken as a characteristic to carry out identifying and controlling, such that power consumption is low and the control and adjustment is more precisely.

Abstract: The present invention provides an integrated circuit with a multiplexed pin and a pin multiplexing method. The multiplexed pin of the integrated circuit extends out with two connecting ends to receive two logic level signals which are finally restored in a chip. A first signal input end receives a signal representing whether to enable or disable, a second signal input end receives a function signal which achieves a certain function, and a diode, a resistor, and a first current source are used together to achieve multiplexing of the pin based on turn-on and clamping characteristics of the diode. The number of pins to be packaged and the area occupied by a chip on board are reduced, which is conducive to a small package design of the chip.

Abstract: A protection circuit and an illumination driving circuit are described herein. The protection circuit comprises a detection circuit, detecting a current flowing through a first switch to obtain a current detection signal and determining whether there is leakage at an input terminal according to the current detection signal; a control circuit, controlling the first switch to switch on intermittently, detecting the current flowing through the first switch by the detection circuit during a switch-on period of the first switch, and keeping the load at a disconnection state if the detection circuit determines there is leakage; and the first switch, connected to the input terminal, and a control terminal of the first switch being connected to the control circuit, and the first switch being controlled by the control circuit to be switched on intermittently. The present invention has the protection function and enhances safety during load removing and installation processes.

Abstract: There is provided a dimming circuit, a dimming method and a LED driving circuit. On the basis of the dimming of a dimmer, the circuit according to the disclosure generates a plurality of current reference signals corresponding to a plurality of loads in accordance with a dimming signal, to change a ratio of load currents of the plurality of loads, so that, the adjustment of color temperature is implemented, wherein the dimming signal represents the changes of switching operation or dimming speed of the dimmer, and the ratio of current load currents of the plurality of loads is latched or a predetermined ratio of load currents is latched. According to the disclosure, the dimmer can be used for directly adjusting color temperature, without the need for a MCU, so that, the system compatibility is improved and the cost is decreased.

Abstract: The present disclosure discloses a bleeder circuit and a control method thereof, and an LED control circuit. The present disclosure is applied in an LED control circuit of TRIAC dimming, directly or indirectly detects cross-zero point of input voltage; after cross-zero point of the input voltage is delayed by a second time, the bleeder module works to generate bleeder current, and a time between turn-on time of the TRIAC and a time that a driving circuit input current achieves a predetermined value (maintaining current of TRIAC) is a first time. During the first time, the bleeder circuit generates losses; when the first time is greater than a predetermined value, the second time is prolonged; when the first time is smaller than the predetermined value, the second time is reduced, such that the first time is close to or equal to the predetermined value.

Abstract: The present invention discloses a bleeder circuit; solutions of the present invention may be applied in linear driving and switch driving solutions; a threshold voltage is a zero crossing value, and when the input voltage is zero crossing, the load current at this time is zero; a bleeder current is generated to make the input current greater than a holding current of a TRIAC dimmer, to maintain turning-on of the TRIAC dimmer, and a second time is set as a delay time, which reduces power consumption. In the application of switch driving solution, the current regulating circuit is controlled to be enabled according to the waveform features of the previous and latter halves of periods of the sine wave as well as the size of the input current of the driving circuit.

Abstract: For controlling a switch power supply, an adjustment module produces a first control voltage by comparing a period of a switch signal with a reference period. A current source module generates a first charging current according to the first control voltage. A pulse signal generating module converts the first charging current into an on time signal or off time signal of a switch transistor. A driving module produces the switch signal according to the on time or off time signal of the switching transistor, so as to control the turn on and turn off signal of a switching transistor. A time measurement module obtains a time parameter according to the switch signal, and generates a periodic adjustment signal according to the time parameter. The adjustment module adjusts the reference period according to the periodic adjustment signal to adjust the period of the switch signal.

Abstract: The present invention provides an integrated circuit with a multiplexed pin and a pin multiplexing method. The multiplexed pin of the integrated circuit extends out with two connecting ends to receive two logic level signals which are finally restored in a chip. A first signal input end receives a signal representing whether to enable or disable, a second signal input end receives a function signal which achieves a certain function, and a diode, a resistor, and a first current source are used together to achieve multiplexing of the pin based on turn-on and clamping characteristics of the diode. The number of pins to be packaged and the area occupied by a chip on board are reduced, which is conducive to a small package design of the chip.

Abstract: Disclosed a battery balance circuit, a control method for battery balance and a battery system. The battery balance circuit is implemented on basis of a circuit structure having a plurality of cascaded balance modules, in which a judgement of abnormal states of batteries or balance modules is realized together with synchronizations of the detection of battery states and battery balance. When the judgement of abnormal states of batteries (including the abnormal states of battery voltages, battery temperatures and battery currents) is made, the balance modules stop balancing by transferring signals, meanwhile, when the balance modules restore from the abnormal state, they restore balance. The disclosure increases the judgement of abnormal states, and implements detection and alarm at abnormal states.

Abstract: The present invention provides a synchronous rectification control circuit, a method and a flyback switching circuit. A drive circuit outputs a drive signal to control the turn-on and turn-off of a synchronous rectification transistor; a threshold comparison circuit controls the drive circuit to output a pull-up drive signal to turn on the synchronous rectification transistor when a drain-source voltage is lower than a preset low threshold voltage and controls the drive circuit to output a pull-down drive signal to turn off the synchronous rectification transistor when the drain-source voltage is higher than or equal to a preset high threshold voltage; a voltage regulation control circuit controls the drive circuit to output a drive signal for pulling up a voltage of the drive signal to a preset pull-up voltage high value when the drain-source voltage is lower than a preset voltage regulation reference value.

Abstract: The present invention provides a control circuit and a control method for a switch circuit and a switching-mode power supply circuit. The control method comprises following steps: detecting an output voltage or an output current, and adjusting an upper limit value and a lower limit value of an inductor current according to a result of comparing the output voltage or the output current with the corresponding reference; and sampling the inductor current, and controlling a main switch transistor in the circuit to be switched off when a sampling current rises to the upper limit value, and controlling the main switch transistor to be switched on when the sampling current drops to the lower limit value. In the present invention, the inductor current is fast in response without overshoot, the output voltage drops very little, there is no overshoot in a process of voltage recovery, and circuit transient response is fast.