US Pat. No. 9,918,365

RIPPLE REMOVING CIRCUIT AND LED CONTROL CIRCUIT APPLYING THE SAME

JOULWATT TECHNOLOGY (HANG...

1. A ripple removing circuit, comprising:
a regulation tube in serial connection with a load, a first end of the regulation tube being connected with the load, and
a second end of the regulation tube being connected with a low potential end of an input voltage;

a first capacitor, both ends of the first capacitor being connected with a control end and the second end of the regulation
tube, respectively;

a current source in parallel connection with the first capacitor; and
a current generating circuit, wherein input ends of the current generating circuit are connected with a high potential end
and a low potential end, respectively, the first end of the regulation tube serves as the high potential end of the current
generating circuit, and a common end of the first capacitor and the current source or a ground potential end serves as the
low potential end of the current generating circuit; a current generated by the current generating circuit is regulated according
to voltages at the high potential end and the low potential end; and an output end of the current generating circuit is connected
with the common end of the first capacitor and the current source.

US Pat. No. 10,143,051

BLEEDER CIRCUIT AND CONTROL METHOD THEREOF, AND LED CONTROL CIRCUIT

JOULWATT TECHNOLOGY (HANG...

1. A bleeder circuit, comprising:a) a bleeder module, having alternating current (AC) input through a triode alternating current (TRIAC) dimmer and a rectifying bridge to get input voltage to provide a load with power supply through a driving circuit, two ends of the bleeder module being connected to high and low potential terminals of an input voltage detecting circuit respectively; and
b) a bleeder control circuit, connected to a control terminal of the bleeder module; directly or indirectly detecting cross-zero point of input voltage; after the cross-zero point of 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 dimmer and a time that a driving circuit input current achieves a predetermined value is a first time;
wherein, when the first time is greater than a reference time, the second time is prolonged; and when the first time is smaller than the reference time, the second time is reduced, such that the first time is close to the reference time;
wherein the bleeder control circuit comprises an input voltage detecting circuit, an input current detecting circuit of a driving circuit, and a logic circuit; the logic circuit is connected to a control terminal of the bleeder module, and the input voltage detection circuit samples the input voltage; when the input voltage sample signal achieves a threshold voltage, after being delayed for a second time, the bleeder module is controlled by the logic circuit to generate bleeder current; the input current detecting circuit of the driving circuit detects the input current of the driving circuit, and when the sample current achieves a threshold current indicating a predetermined current, the bleeder current is controlled by the logic circuit to be zero; comparing the first time with the reference time, and adjusting the second time correspondingly according to the comparison result.

US Pat. No. 9,787,182

SELF-ADAPTION CURRENT CONTROL CIRCUIT

JOULWATT TECHNOLOGY (HANG...

1. A self-adaption current control circuit, comprising:
a regulating transistor, a first sampling comparison circuit, a proportion control circuit, a variable sampling resistor,
and a second sampling comparison circuit;

wherein the regulating transistor and the variable sampling resistor form a series circuit, one end of the series circuit
is connected with a current input end, and the other end is connected with a current output end;

the first sampling comparison circuit takes a sample of a first sampling signal corresponding to the regulating transistor,
generates a first integral signal after comparing and evaluating an integral of the first sampling signal and a first setting
threshold value, and generates a command signal after the first integral signal passes through a proportion circuit;

the proportion control circuit generates a first control signal through a comparison between the obtained command signal and
a second setting threshold value, a resistance value of the variable sampling resistor and a coefficient of the proportion
circuit are adjusted through the first control signal, an increasing proportion or a decreasing proportion of the resistance
value of the variable sampling resistor is consistent with an increasing proportion or a decreasing proportion of the coefficient
of the proportion circuit; and

the second sampling comparison circuit obtains a second sampling signal through the variable sampling resistor and generates
a second control signal after comparing and amplifying the second sampling signal and the obtained command signal, and a current
of the regulating transistor is controlled through the output second control signal;

wherein the first setting threshold value is a fixed threshold value or a self-adaption threshold value.

US Pat. No. 10,090,750

ISOLATING SWITCH CIRCUIT AND CONTROL METHOD THEREOF

JOULWATT TECHNOLOGY (HANG...

1. An isolating switch circuit comprising a main power switch transistor, a transformer and a synchronous rectification transistor, the transformer comprising a primary winding and a secondary winding, the main power switch transistor being connected with the primary winding, and the synchronous rectification transistor being connected with the secondary winding;wherein a secondary control circuit receives a first control signal representing first time information, the secondary control circuit is connected with a control end of the synchronous rectification transistor, and the first control signal is configured to control turn-off of the synchronous rectification transistor; the first time information is:
time from a moment when the synchronous rectification transistor turns off a parasitic diode to start freewheeling to a moment when a secondary current decreases to zero within one switching cycle,
or a ratio of the time from the moment when the synchronous rectification transistor turns off the parasitic diode to start freewheeling to the moment when the secondary current decreases to zero within one switching cycle to time from a turn-on moment of the synchronous rectification transistor to the moment when the secondary current decreases to zero,
or a product of the time from the moment when the synchronous rectification transistor turns off the parasitic diode to start freewheeling to the moment when the secondary current decreases to zero within one switching cycle and a sampling voltage signal representing an output voltage; and
wherein the first time information is detected from a primary side to obtain a detection signal representing the first time information, and a state of the main power switch transistor is adjusted through a primary control circuit according to the detection signal representing the first time information.

US Pat. No. 10,153,684

BLEEDER CIRCUIT

Joulwatt Technology (Hang...

1. A bleeder circuit comprising:a current regulating circuit comprising a regulating switch and a current source and/or resistor connected in series with the regulating switch; wherein an input voltage is obtained from an alternating current input through a TRIAC dimmer and a rectifying bridge to supply load with power through a driving circuit, two ends of the current regulating circuit connected to high and low potential terminals of the input voltage;
a bleeder control circuit connected to a control terminal of the regulating switch; wherein at a previous half period of a half sine wave when the input voltage is lower than a threshold voltage the current regulating circuit generates bleeder current by regulating a control terminal of the regulating switch until the input current of the driving circuit is greater than a corresponding threshold current, and the current regulating circuit does not generate bleeder current; at the latter half period of the half sine wave when the input current of the driving circuit is lower than the corresponding to the threshold current, the control terminal of the regulating switch is regulated to make the current regulating circuit generate bleeder current until the input current of the driving circuit is reduced to a low threshold, and then the current regulating circuit does not generate bleeder current;
wherein the bleeder control circuit comprises an enable signal generating circuit and a driving control circuit connected to the control terminal of the regulating switch; wherein the enable signal generating circuit generates signals to indicate whether to enable by detecting the input voltage and the input current of the driving circuit, and the driving control circuit receives the signals to indicate whether to enable and controls the status of the regulating switch;
wherein the driving control circuit receives a current sample signal indicating total input current and performs error process on the current sample signal and the current reference signal to get a driving voltage, such that when the current regulating circuit is enabled, the driving voltage is used as the voltage of the control terminal of the regulating switch to regulate bleeder current flowing though the regulating switch;
wherein the driving control circuit comprises
an error amplifier and a first comparator, the error amplifier having a first input terminal, a second input terminal and an output terminal and the first comparator having a first input terminal, a second input terminal and an output terminal;
wherein the first input terminal of the error amplifier receives current sampling signals indicating a total input current, the second input terminal receives the current reference signal, and the output terminal outputs driving voltage; the output terminal of the error amplifier is connected to the control terminal of the regulating switch through a switch, and the control terminal of the switch receives a signal indicating whether to enable; the first input terminal of the first comparator receives the driving voltage, and the second input terminal receives a reference voltage indicating a threshold current, and the output terminal of the first comparator outputs signals to indicate whether the input current of the driving circuit achieves the threshold current, and get the corresponding signals to indicate whether to enable.

US Pat. No. 10,075,152

INTEGRATED CIRCUIT WITH MULTIPLEXED PIN AND PIN MULTIPLEXING METHOD

JOULWATT TECHNOLOGY (HANG...

1. An integrated circuit with a multiplexed pin, comprising:a multiplexed pin for receiving a high-level signal and a low-level signal, the multiplexed pin having a first connecting end and a second connecting end;
a diode having an anode and a cathode, the first connecting end being connected with the anode of the diode, and the cathode of the diode being used as a first signal input end;
a resistor, one end being connected with the second connecting end, and the other end being used as a second signal input end; and
an on-chip circuit, comprising a first current source and a comparison circuit, wherein the first current source is electrically connected with the multiplexed pin, the comparison circuit is electrically connected with the first current source, the comparison circuit compares a voltage on the multiplexed pin with a first threshold voltage to obtain a signal representing an input at the first signal input end, and the comparison circuit compares the voltage on the multiplexed pin with a second threshold voltage to obtain a signal representing an input at the second signal input end.

US Pat. No. 10,199,949

ACTIVE-CLAMP FLYBACK CIRCUIT AND CONTROL METHOD THEREOF

JOULWATT TECHNOLOGY (HANG...

1. An active-clamp flyback circuit, comprising a main power switch tube, a transformer and a secondary rectifier tube, the transformer comprising a primary winding and a secondary winding, the primary winding comprising magnetizing inductor, the main power switch tube being connected with the primary winding, the secondary rectifier tube being connected with the secondary winding, a primary control circuit controlling a switching state of the main power switch tube, and the secondary rectifier tube being turned on to freewheeling after the main power switch tube is turned off;the active-clamp flyback circuit further comprising a first capacitor and a first switch tube, one end of the first capacitor being connected with a high potential end of an input power supply, the other end of the first capacitor being connected with a first end of the first switch tube, and a second end of the first switch tube being connected with a common end of the main power switch tube and the primary winding; and
wherein a working mode of the active-clamp flyback circuit is determined, if the active-clamp flyback circuit works in a boundary conduction mode or a discontinuous conduction mode, 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.

US Pat. No. 10,205,448

SWITCH CONTROL CIRCUIT AND SWITCH CIRCUIT

JOULWATT TECHNOLOGY (HANG...

1. A switch control circuit, wherein a main transistor and an auxiliary transistor coupled to a switch main circuit, the switch control circuit comprising a logic control circuit and a current detection circuit, one end of the current detection circuit being coupled to the switch main circuit and the other end being coupled to the logic control circuit, the current detection circuit receiving an instruction current, sampling a main transistor current when the main transistor is turned on, and comparing the instruction current with the main transistor current, the logic control circuit counting on-time or off-time of the main transistor and controlling on and off states of the main transistor; andwhen the on-time of the main transistor reaches a constant on-time, detecting whether an inductor current reaches the instruction current, prolonging the on-time of the main transistor if the inductor current fails to reach the instruction current, and turning off the main transistor when the inductor current reaches the instruction current or exceeds the instruction current by a certain threshold; or when on-time of the auxiliary transistor reaches a constant off-time, detecting whether the inductor current is smaller than the instruction current, prolonging the off-time of the main transistor if the inductor current is not smaller than the instruction current, and turning on the main transistor when the inductor current is smaller than the instruction current or smaller than the instruction current by a certain threshold.

US Pat. No. 10,218,272

CONTROL CIRCUIT AND CONTROL METHOD FOR SWITCH POWER SUPPLY, AND SWITCH POWER SUPPLY

Joulwatt Technology (Hang...

1. A control circuit for a switch power supply comprising:an adjustment module that produces a first control voltage by comparing a period of a switch signal with a reference period;
a current source module that generates a first charging current according to the first control voltage;
a pulse signal generating module that converts the first charging current into an on time signal or off time signal of a switching transistor;
a driving module that produces the switch signal according to the on time or off time signal of the switching transistor, so as to control the turning on and turning off of the switching transistor; and
a time measurement module that obtains a time parameter according to the switch signal, and generates a periodic adjustment signal according to the time parameter; and
wherein the adjustment module adjusts the reference period according to the periodic adjustment signal to adjust the period of the switch signal.