59results about How to "Reduce no-load power consumption" patented technology

The disclosure is directed at a configurable light emitting diode (LED) driver/dimmer for controlling a set of light fixture loads comprising: a power circuit; a primary digital controller for controlling the power circuit; a set of output current drivers, each of the set of output current drivers connected to one of the set of light fixture loads for controlling the associated light fixture load; a secondary digital controller for controlling the set of output current drivers; wherein the secondary controller transmits LED control information to control outputs of the set of output current drivers; and wherein the secondary digital controller provides digital feedback control information to the primary digital controller.

The invention provides an asymmetric half-bridge flyback converter and a driving control method therefor. A load detection circuit detects a load signal of the asymmetric half-bridge flyback converter, compares the load signal with a set load point, forms a feedback signal by the comparison result, and outputs the feedback signal to a driving control module and a main control chip concurrently; the main control chip outputs a PWM signal to a driving circuit; the driving circuit outputs two paths of signals, namely, a main switching tube driving signal and a driving voltage signal; the main switching tube driving signal drives the switch on and switch off of a main switching tube; the driving voltage signal is input to the driving control module; and after the driving control module receives the driving voltage signal and the feedback signal, a first driving signal or a second driving signal is output to control the switch on or switch off of a clamping switching tube. The control method and the control circuit are simple and reliable, easy to realize, capable of solving the problems of high loss in light load output and no load of the asymmetric half-bridge flyback converter, and capable of improving the light load efficiency.

The invention discloses an asymmetric half-bridge converter and a control method thereof. A one-way clamping network is additionally arranged and is connected in parallel with a primary side, a secondary side or a third winding of a transformer, an auxiliary switch is controlled to be switched off when an excitation inductance current reaches a set value, the one-way clamping network is conducted,a clamping current passes through the one-way clamping network, the clamping current is clamped and maintained to be basically unchanged by the one-way clamping network, the one-way clamping networkis controlled to be switched off within a certain time before a main switch is conducted, the clamping current is released, voltages of two ends of the main switch are reduced to zero or be approximate to zero, and zero-voltage conduction of the main switch is achieved. By the asymmetric half-bridge converter, effective control of negative peak of the excitation inductance current can be achieved,a current effective value of a power device under light load of a converter is reduced, the light-load efficiency of the converter is substantially reduced under the condition that the advantages ofzero-voltage conduction of an existing technical scheme is maintained, the no-load loss is reduced, and control implementation is simple and efficient.

The invention provides a drive control method and drive control circuit with the object of reducing the loss of asymmetrical half-bridge fly-back converters in outputting light load or no load wherein the drive control circuit comprises a drive control module used to realize drive control over a transistor. The transistor consists mainly of a main switch tube and a clamp switch tube as well as a light load detection control circuit. The light load detection control circuit comprises a feedback signal control module and a frequency control module wherein the feedback signal control module detects the output load of a switch converter, compares the output load signal of the switch converter to see if it is lower than a set load point or not and outputs the comparison result of the detection value to the frequency control module. The frequency control module, based on the comparison result, maintains or raises the working frequency of the drive control module. That means if it is not light load, the working frequency of the drive control module stays unchanged. And if it is light load, the working frequency of the drive control module is raised.

The invention belongs to the field of electric welding and particularly relates to an arc striking pulse peak current control electric welding machine and a control method thereof. The electric welding machine applies a low-frequency low-duty-ratio pulse current during short circuit, and an arc striking pulse peak current of the low-frequency low-duty-ratio pulse current ranges from a 30A welding current to a triplex welding current. Therefore, the arc striking pulse peak current can be higher than the welding current during the low welding current, and arc striking is facilitated; and the arc striking pulse peak current can be lower than the welding current during the high welding current, a short-circuit limit output circuit is cut off after arc striking in welding is successful, the welding current slowly rises from the minimum current to the welding current, and the striking current can be reduced by the means.

The invention belongs to the field of switching power supplies, and relates to a power failure holding circuit and a control method. The power failure holding circuit comprises a controller, a switch, a filter capacitor, an energy storage capacitor and a bidirectional direct-current converter, and the bidirectional direct-current converter comprises an inductor, a switching tube S1, a switching tube S2, a diode D1 and a diode D2; the bidirectional direct-current converter is controlled by the controller to enable the power-down holding circuit to work in a boost mode, a buck mode or a free discharge mode. In a boost mode, the inductor, the switching tube S1 and the diode D2 form a boost circuit; in a buck mode, the inductor, the switching tube S2 and the diode D1 form a step-down circuit, and the switching tube S2 works in an on-off state; in the free discharge mode, the switching tube S2 is controlled to be in a normally-on state, and the energy storage capacitor directly supplies power to the output voltage. The boost and buck modes are controlled by independent switching tubes, the switching response speed of the boost and buck modes is high, and the problems of narrow application range, complex control and slow mode switching dynamic response in the prior art can be effectively solved.

The invention discloses a switching converter, which comprises a rectifying filter circuit, a first step-down circuit, a second step-down circuit, a starting circuit, a control and driving circuit anda control and driving power supply circuit. A two-stage cascade step-down circuit is adopted in the invention, the output of the first step-down circuit serves as inputs to the second step-down circuit and the control and driving power supply circuit, At the same time, the output of the first step-down circuit is control and processed by the control and drive power supply circuit to supply the working voltage as the output of the control and driving circuit, the control and driving circuit collects the output voltages of the first buck circuit and the second buck circuit in real time to driveand control the on and off of the power transistor in the two-stage cascaded buck circuit, By adjusting the duty cycle of the two-stage buck circuit, the output voltage can be adjusted, which can notonly meet the requirements of high buck ratio, but also avoid the small and narrow duty cycle, and greatly reduce the no-load power consumption and improve the performance of the circuit.

The invention relates to a rapid-mounting working head of a multipurpose tool. The rapid-mounting working head of the multipurpose tool is good in rigidity. A fixing unit for to be fixed by the multipurpose tool and a function end which is integrated with the fixing unit or is connected with the fixing unit to form a whole are arranged on the rapid-mounting working head. A fixing hole is formed in the fixing unit of the rapid-mounting working head. A plug hole is formed in the fixing unit of the working head. The inscribed circle diameter of the plug hole is larger than that of the fixing hole. An outer flange of the first multipurpose tool can be axially inserted into and pulled out of the plug hole. The plug hole is communicated with the fixing hole. A fixing piece of the outer flange of the multipurpose tool can pass through a channel from the plug hole to the fixing hole in the radial direction. Besides, the fixing hole of the rapid-mounting working head is closed, and the rapid-mounting working head can be rapidly mounted on the first multipurpose tool.

The invention discloses a transformer circuit and a method for lowering no-load power consumption. The transformer circuit comprises a transformer and an auxiliary winding circuit. The transformer comprises an iron core, a primary winding, a secondary winding and an auxiliary winding. The auxiliary winding circuit is connected with the auxiliary winding. The auxiliary winding circuit supplies power to a chip. The auxiliary winding circuit comprises a first power supply circuit and a second power supply circuit. The auxiliary winding comprises a first end, a second end and a tap located between the first end and the second end, the first end of the auxiliary winding is connected with the input end of the first power supply circuit, the tap of the auxiliary winding is connected with the input end of the second power supply circuit, the output end of the first power supply circuit is connected with the output end of the second power supply circuit and the power supply end of the chip, and the second end of the auxiliary winding is grounded; input voltage of the second power supply circuit is smaller than input voltage of the first power supply circuit. The no-load power consumption can be lowered when the voltage output by the whole auxiliary winding becomes larger.

The invention relates to a device for controlling power supply. The device comprises a switch unit; a processor for controlling the on and off of the switch unit; and a capacitor unit for receiving electric energy for charging the capacitor unit from a power source when the switch unit is connected. When the load current provided for a load by the power source through the device is smaller than apreset first threshold value, the processor controls the switch unit to be disconnected with the power source; and the capacitor unit provides power for the processor during the switch unit disconnecting period, so that when the load is connected to the device, the processor can control the switch unit to be connected.

The invention discloses a regulation method and device. The regulation method includes: acquiring M current performance data from M servers in a cabinet, wherein each current performance datum in the M current performance data at least includes current utilization information in main controller performance data of the main controller of the M servers, and M is an integer greater than or equal to 1; determining at least one adjustment parameter used for adjusting air supply equipment according to the M current performance data; according to the at least one adjustment parameter, controlling current air supplying mode of the air supply equipment so as to enable the current air supplying mode to be matched with M current utilization of the M main controllers.

The invention provides a micro-power isolated power source for M-BUS power supply and a control method thereof. According to the micro-power isolation power source, a flyback transformer in an existing BUCK step-down circuit replaces an original inductor, and through a filter circuit, a sampling circuit and a comparison control circuit, isolated voltage stabilization output of the micro-power isolated power source is achieved to supply power to an M-BUS. The micro-power isolated power source is simple in circuit, low in realization cost and stable in output voltage, the low-current input within a wide input voltage range and under a micro power can be achieved by relying on the characteristics of the BUCK circuit, and meanwhile the requirements for high-voltage and low-current input and low-voltage and micro-power isolated voltage stabilization output and the power supply requirements of the M-BUS are met.

The invention relates to the field of switching power supplies, in particular to a BUCK control circuit and a BUCK control method. The BUCK control circuit comprises a resistor R1, a resistor R2, a resistor R3, a comparator COMP1, a comparator COMP2, a comparator COMP3, an AND gate U1, an RS trigger U2, a reference generation circuit and a drive circuit. The BUCK control circuit can solve the problem of poor dynamic characteristics of an existing power supply, achieves the effect of outputting zero overshoot and undershoot when the input voltage and the output load jump at the same time, and is lower in manufacturing cost compared with the prior art. And under the condition of ensuring the performance of output zero overshoot and undershoot, the no-load switching frequency is low, and theno-load power consumption is low.

The invention relates to a multistation hydraulic group control energy-saving technology. According to the multistation hydraulic group control energy-saving technology, a plurality of single device hydraulic stations in some region perform networking operation, oil tanks of the single device hydraulic stations are communicated with each other, all the hydraulic stations can output a few pressure sources, power sources with the same pressure are collected together through main pipelined, power sources with different pressures operate in different pipelines, and all the hydraulic stations can output various power resources with different pressure grades in a unified mode. Hydraulic energy storage stations with a certain capacity can be arranged on the pressure main pipelines and cooperate with the hydraulic stations to work, starting-up capacity of an electric motor-pump can be reduced, and the energy saving rate of a hydraulic system performing networking operation reaches 60 percent to 80 percent.

The invention discloses a forward-flyback auxiliary power supply circuit, which comprises a flyback power supply module, a forward power supply module and a sampling module, and can be applied to a KNX bus power supply and a circuit with a short-circuit constant current requirement or an extremely low voltage output requirement. According to the invention, when the power supply works in a steady state, the flyback power supply module supplies power to a main control IC and a feedback loop; the auxiliary power supply is switched to the forward power supply module to supply power to the main control IC and the feedback loop during a short circuit, and normal work of the IC and the feedback loop is guaranteed. The circuit can also realize a short-circuit constant-current function. The invention further discloses a forward-flyback power supply circuit, and the principle is the same as that of the forward-flyback auxiliary power supply circuit. According to the invention, low no-load powerconsumption and high complete machine efficiency under high and low voltage input are ensured.