Qsc - Pl905 电路图.pdf

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1、FEATURES 1675 MacArthur Boulevard Costa Mesa, California 92626-1468 USA Ph: 714/754-6175 Fax: 714/754-6174 Web: E-mail: PowerLight T T T T T PowerLight 9.0PFC he PowerLight 9.0PFC sets new standards in high power professional amplifiers, delivering over 4500 watts/ch. at 2 ohms. At only 3RU, 19.5” d

2、eep, and 59 lbs., the PowerLight 9.0PFC has the highest ratio of power to size and weight ever achieved by a professional power amplifier. QSC engineered this massive power output capacity and compact size through several breakthroughs in power supply technology and output circuit design. Foremost a

3、mong these is the first incorporation of power factor correction (PFC) in an audio amplifier power supply. PFC lowers average AC current requirements by as much as 40% and peak Highest continuous output capacity of any audio amplifier Highest output voltage swing of any audio amplifier First audio p

4、ower amp with PFC. PowerWavePFC Switching Technology improves audio performance and lowers AC current requirements Lowest AC current draw per watt of output Four-step Class H output for the highest efficiency of any linear amplifier First Current Cell, quasi- complementary full-bridge output circuit

5、 using ultra-high power N-channel MOSFETs Ideal for powering subwoofers and low frequency drivers or high-power full-range systems Zero inrush current at start-up avoids tripping circuit breakers Line and load regulation maintains peak power output despite AC fluctuations Clip Limiter (user defeatab

6、le) reduces distortion, helps protect loudspeakers Unique clip-tracking circuitry provides instant recovery and maintains constant damping Detented gain controls with 2 dB steps for easy resetting Neutrik “Combo” (XLR and Neutrik Speakon COOLING: Four variable-speed fans, rear-to-front air flow AMPL

7、IFIER PROTECTION: Full short circuit, open circuit, thermal, ultrasonic, and RF protection. Stable into reactive or mismatched loads. LOAD PROTECTION: On/off muting, DC-fault power supply shutdown. OUTPUT CIRCUITRY: N-channel MOSFET Current Cell full-bridge, four-step Class H output POWER REQUIREMEN

8、TS: (120 VAC) Multiply current by 0.5 for 230V units. 1. Pink noise 1/8 of rated power represents typical audio program with minimal clipping. 2. Pink noise 1/3 of rated power represents audio program with heavy clipping. DIMENSIONS: 19” (48.3 cm) rack mounting 5.25” (13.3 cm) tall (3 rack spaces) 1

9、7.9” (45.5 cm) deep (behind front mounting rails) 1.6” (4.1 cm) in front of mounting rails 19.5“ (49.5 cm) overall depth WEIGHT: 59 lbs (27 kg) net, 66 lbs (30 kg) shipping Output Averaging short circuit protection (US Patent 4,321,554) SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE. ARCHITECTS AND

10、 ENGINEERS SPECIFICATIONS DAOLELDI MARGORPLAMRON REWOP8 / 1 1 MARGORPXAM REWOP3 / 1 2 EVAWENISXAM GNIPPI LC%1 8 A4 . 2A21A32A94 4 A4 . 2A91A83A78 2 A4 . 2A42A25A521 The amplifier shall employ forced-air cooling with variable speed fans for minimum acoustic noise. The flow of air shall be from rear t

11、o front to avoid temperature rise inside the equipment rack into which it is mounted. It shall be possible to fully and safely operate one or more rack-mounted amplifiers without empty space above, below, or in between them. The amplifier shall be capable of continuous operation at 1/3 power into 4-

12、ohm loads in ambient temperatures up to 104F (40C). The amplifier shall contain two independent amplifier channels, each with separate and independent power-factor-corrected switching power sup- plies. The amplifiers power supplies shall exhibit an AC line power factor better than 0.99 at all output

13、 powers in excess of 500 watts. The 120V units shall operate correctly on program material for line voltages of 80 volts to 135 volts when connected to a circuit nominally rated at 120 VAC, and 230V units shall have a similar compliance range on 230 VAC circuits. All amplifier protection systems sha

14、ll be self-resetting upon removal or cessation of the offending faults. Each channel shall have protective circuitry against short circuit or mismatched loads. Each channel shall indepen- dently monitor heat sink temperature and shall adjust its fan speed to reduce internal heat sink temperatures, a

15、nd if necessary, shall initiate signal muting to prevent excessive temperature rise. Both channels shall have on-off muting, acting for two seconds after turn-on, and within second after turn-off or loss of AC power. Each channel shall have DC fault protection for the load, consisting of a shutdown

16、of each amplifier channels power supply. There shall be no relay contacts in series with the amplifier outputs. On the front panel shall be the AC power switch; a green power-on LED indicator; a yellow standby LED indicator and a red protect LED indicator. Each channel shall have the following contr

17、ols and displays: a front panel detented gain control, with 11 gain settings: 32 dB, 30 dB, 28 dB, 26 dB, 24 dB, 22 dB, 20 dB, 18 dB, 14 dB, 8 dB, -; a recessed clip limiter defeat switch; a green “signal present” LED triggering at -30 dB; two yellow LED output indicators, triggering at -20 dB and -

18、10 dB; a red LED showing true amplifier clipping. Each channel shall have a user-defeatable clip limiter. The output connectors for each channel shall be Neutrik Speakon con- nectors in parallel with 60-ampere “touch-proof” binding posts, accepting individual banana plugs or up to 4 AWG (6 mm) wire.

19、 Connector terminals shall be arranged on one-inch centers to discourage the use of low power connections and to comply with European safety codes. The rear panel input shall provide barrier strip and Neutrik “Combo” con- nectors for each channel. The XLR input shall be wired with pin 2 positive, pi

20、n 3 negative, and pin 1 shield; the ” TRS input shall be wired with tip positive, ring negative, and sleeve grounded. Inputs shall be electronically balanced, with a minimum impedance of 10 kilohms per side, and a common mode rejection of at least 50 dB from 20 Hz to 20 kHz. A high-density 15-pin Da

21、ta Port connector shall carry audio and amplifier operational status signals to and from a QSC MultiSignal Processor. A recessed slide switch on the rear panel shall allow selection of stereo, bridging, or parallel operating modes. A two-position barrier strip on the rear panel shall be used for rem

22、ote control of the power supplies; making an electrical connection between the terminals shall place both amplifier channels in standby mode when the front panel power switch is in the “on” position, while opening the connection causes the power supplies to re- sume operation. The front panel power

23、switch shall function as a master switch that removes all AC power. Each channel shall be capable of meeting the following performance cri- teria with both channels driven: sine-wave output power of 1800 watts into eight ohms, and 3200 watts into four ohms, 20 Hz to 20 kHz, with less than 0.2% THD.

24、Frequency response at 3 dB below rated power shall be 20 Hz to 20 kHz, 0.15 dB. The voltage gain shall be 40, equivalent to 32 dB, and the full-power input sensitivity for an 8-ohm load shall be 3 VRMS. The signal to noise ratio over the range of 20 Hz to 20 kHz shall exceed 106 dB relative to full

25、output. IHF damping factor shall exceed 2000. The amplifier chassis shall occupy three rack spaces, with provision for securing and supporting the rear corners. Depth from mounting surface to tips of rear supports shall be 17.9 (45.5 cm). Weight shall not exceed 60 lbs (27.3 kg). The amplifier shall

26、 be the QSC Audio Products PowerLight 9.0PFC. Rear panel photo goes here FPO The amplifier shall contain all solid-state circuitry, using N-channel MOSFET silicon output devices in a quasi-complementary full bridge configuration. The amplifier shall employ a four-level class-H stepped rail structure

27、 and shall exceed the efficiency of an ordinary class-B linear output circuit. The amplifier shall operate from 5060 Hz AC power. The amplifier shall draw less than 2280 VA when driven with random program material at 1/8 rated power into four ohm loads. The amplifier shall be supplied with an AC cord having a standard twist-lock 30-ampere AC plug, NEMA L5-30, for 120 V units and shall operate from a 30A outlet; 220240 V units shall be equipped with a 320-C19 16A IEC mains connector. The amplifier shall comply with FCC part 15 Class A requirements. TMTM RadioFans.CN 收音机爱 好者资料库