Handbook for Sound Engineers

672 Chapter 19 Internal Output Impedance. The impedance pre- sented to the equipment receiving the power supply voltage. In the ...

Power Supplies 673 A full-wave bridge rectifier supplies full-wave recti- fication without a center tap on the transformer. The ...

674 Chapter 19 (19-3) where, Irect is the current per rectifier, 0.5 is a constant from Table 19-1, Idc is the rectified ac curr ...

Power Supplies 675 When a dc voltmeter is connected across the unfil- tered output of a rectifier, it will read the average volt ...

676 Chapter 19 A choke filter operates best with maximum current flow. It has no effect on a circuit when no current is flowing. ...

Power Supplies 677 section filter, Fig. 19-5E. S filters have a smooth output and poor regulation. They are often used where the ...

678 Chapter 19 lated supplies may be simple shunt or series regulators with 1–3% regulation or high gain supplies with 0.001% re ...

Power Supplies 679 necessary to accomplish this, Fig. 19-7A. Its imped- ance curve is shown in Fig. 19-9A. An ideal constant-vol ...

680 Chapter 19 IL is the load current, IZ is the zener current, (normally 10% of IL.) The power dissipated in R 1 is I ²R. The d ...

Power Supplies 681 that ultimately controls the regulator output. Comparator Elements. Compares the feedback volt- age from the ...

682 Chapter 19 use of the nomograph in Tables 14-2 and 14-3. Since regulated power supplies are designed to control the output a ...

Power Supplies 683 that each switch operates at one-half the ramp frequency or 20 kHz. The addition of a triac preregulator and ...

684 Chapter 19 line voltage returns to zero. The rate that the C 1 charges is controlled by Q 1. When Q 1 is turned on, much of ...

Power Supplies 685 fier has a lower duty cycle and thus a shorter conduction time. However, the Schottky rectifier’s forward dro ...

686 Chapter 19 and forms a half-bridge configuration that clamps the switching node to 0.1 V or less. The diode in Fig. 19- 18A ...

Power Supplies 687 Continue to hold the synchronous switch on until the beginning of the next cycle, allowing the inductor to r ...

688 Chapter 19 voltage for the cost of a diode, a capacitor, and a little wire, Fig. 19-20. Normally, the coupled-inductor flyba ...

Power Supplies 689 mobility confers a near 2:1 improvement in gate capaci- tance and on-resistance. A flying-capacitor boost cir ...

690 Chapter 19 source tied to the negative output and its drain tied to the switching node. The circuit tricks the resulting 300 ...

Power Supplies 691 where, Run time is in minutes, dc load is in watts. 19.9.1 Ultra Capacitor Characteristics Ultra Capacitors d ...