Saturday, January 8, 2011

Weak current College】 【power technology glossary (3)】.

Reentrant current limiting CURRENT FOLDBACK LIMITING an over-current protection. Use reentrant current limiting way, when the load current reaches a certain value after fall, when the load closer to the short circuit, output current limit to the minimum value. Forward converter FORWARD CONVERTER a converter electric circuit. In the circuit, when a transformer primary switching elements breakover, input energy is transferred to the output. G gate input GATE Gate IN the execute as clause on modules In feet can be used to open or shut off the module. When the Gate In a low level (to-Vin pin voltage less than 4mA 1V, current), module shutdown when the Gate is In feet dangling (open-collector), module conduction. Gate In feet to-Vin foot open-circuit voltage is lower than 10V. Drive modules and multiplier module composite structure, you must connect the Gate Gate In and Out. Gate output GATE OUTGate Out feet for the converter's clock pulse output pin. In the array, the foot signal allows the multiplier module and drive synchronization run. Grounding GROUND grounding or receive other grounding conductor. Sometimes the "ground" is used to represent the public contacts. But unless public contact grounding, this usage is wrong. Ground fault circuit GROUND LOOP which is two or more circuits together a grounding and harmful feedback loop. H superposition sine wave HAVERSINE the waveform Basic for a sine wave characteristics, but it is the superposition of the other wave sine wave part. Typical off-line power supply input current waveform is the waveform. Input and output voltage difference HEADROOM for the tandem breakover voltage-stabilized source, it indicates that the input voltage and output voltage. Heatsink HEATSINK fins for a large heat capacity materials, which can be limited to absorb heat, and temperature which basically remain unchanged. Huai-cell power modules do not necessarily require that the heat sink, it is mainly used for high-power power and environmental temperature higher device. Maximum power input voltage HIGH LINE INPUT input pin can join maximum steady state input voltage. High voltage (HIPOT) HIGH POTENTIAL (HIPOT) pressure is typically used by the management bodies of the point gas safety testing insulation voltage capability. Keep the capacitor capacitance of the CAPACITOR the HOLDUP stored energy can input voltage interruption after a period of time, keep the output voltage. Maintain time HOLDUP TIME) is very small, so that the maintenance time is very short. In switching power supply, primary energy storage of high-voltage capacitors, so keep a long time. AC input power after a failure. Power to maintain the output voltage is the same time. Linear regulated power supply, secondary voltage output capacitor energy storage (CV hotplug HOT SWAP in power system of the power plug or unplug. I I-level I-GRADE an industry standard. I-level devices operating temperature not lower than-40 parallel C. Impedance IMPEDANCE specified frequency, voltage and current. Reduced noise INDUCED NOISE magnetic field should change, through other circuits in the circuit noise. Input power filter INPUT LINE FILTER power internal external low-pass or band-stop filter, the filter can decay into the power of noise. Input inrush current INRUSH CURRENT power moment, into the power supply of the peak current. Since the input filter capacitor rapid charging the peak current is greater than the steady-state input current. Inrush current limiting INRUSH CURRENT LIMITING the power is switched on, the moment limit input inrush current circuits. Transit bus structure INTERMEDIATE BUS ARCHITECTUREIBA this structure is characterized by the use of transit bus converter (IBC), the relatively low pressure on the transformation of voltage distribution, and to connect non-isolated pol converters (niPOLs) to load. Intermediate bus converter INTERMEDIATE BUS CONVERTERIBC multiple manufacturers on the market, IBC generally refers to the DC bus from pre-stabilizing transformation to a non-isolated intermediate voltage regulator and brick type converter. General transit 12, 8, 5, or 3Vdc, typical load non-isolated pol converters (niPOLs). Insulated ISOLATION between two circuits of DC voltage and AC voltage completely isolated. In the power supply unit, input and output through the transformer isolation. Insulation voltage ISOLATION VOLTAGE continuously added to the power input to output and input and output to the top of the chassis, AC or DC voltages. L LEAKAGE CURRENT leakage current flowing through the AC power cord and grounding line between current. A leakage current is not necessarily a problem state. In the current device, the leakage current means through the AC power cord and grounding line EMI filter capacitor between the (Y capacitors) 60Hz leakage current. Linear regulators LINEAR REGULATOR in this regulator, input and output between strings into active devices such as transistors, adjusted by changing the in-line tube pressure drop to stable output voltage. Power LINE voltage adjustment rate REGULATION AC input voltage from lowest value to the maximum value, the output voltage changes. AC power LINE voltage (Mains) VOLTAGE (Mains) added to the power supply input sine wave voltage, the voltage is usually expressed with valid values. Load regulation LOAD REGULATION output load current changes, the change of output voltage. Native sampling LOCAL SENSING with power supply output voltage adjustment of output voltage voltage sampling. Long-term stability of LONG TERM STABILITY in all other factors remain unchanged, the power supply output voltage changes over time.The performance with the relative percentages expressed, and the degree of aging with components. Minimum supply voltage LOW LINE to maintain the converter output voltage stable minimum steady-state input voltage.

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