High Slew Rate Output

The high slew rate option solves several limitations inherent in switching power supply design. Rapid voltage transitions require internal electronics to supply the energy to charge and discharge output capacitors. Peak currents internal to the power supply define slew rate; utilizing less capacitance enables voltage transitions in shorter time periods. Additionally, less capacitance reduces requirements for discharge demands during open circuit conditions.

The standard output stage Magna-Power Electronics power supplies has been designed to provide the lowest possible output ripple voltage within the constraints of available components, size, and cost. Part of the output stage consists of a bank of aluminum electrolytic capacitors which has the desired electrical properties to provide this function. These components require bleed resistors to discharge any voltage when the power supply has no load and is disabled. While the presence of these components and the resulting performance are normally industry accepted, there are applications where lower output capacitance and lower loss bleed resistors are extremely desirable and higher ripple voltage is acceptable. To meet this need, a high-slew rate option is available which has an output stage consisting of low capacitance film and aluminum electrolytic capacitors and lower loss bleed resistors. Applications for the high-slew rate option include battery charging, photovoltaic emulation, power waveform generation, and medium speed power pulsing. These applications all benefit from higher bandwidth and in many cases, can tolerate increased ripple voltage.

Key Applications

For battery charger applications, output capacitance and internal bleed resistors present themselves as a load to the connecting batteries. One common practice is to use a series diode to block reverse current flow with the sacrifice of increased cost and lower efficiency. The high slew rate option, with its lower output capacitance and lower loss bleed resistors, enables direct connection to batteries without series blocking diodes.

For photovoltaic emulation applications, higher bandwidth and lower output capacitance enable improved performance with higher speed, maximum power tracker algorithms. Maximum power tracker circuitry deviates the operating point of photovoltaic arrays to determine maximum power output. Slow responding emulation sources can present a problem when the speed of the algorithm exceeds that of the source. Furthermore, with lower output capacitance, changes in the operating point and transients, caused by shorting the solar inverter input, produce lower unwanted input currents.

The high-slew rate option enables the power supply to operate as a low frequency, power pulse generator. With the special capacitors selected for this option, it is possible to superimpose waveforms or produce a medium speed pulse on top of the dc output and expect normal capacitor life. It is important to note that the power supply output is single quadrant; that is, the output voltage or current cannot reverse.

Specifications

SL Series Output Stage Ratings with the High Slew Rate Output Option Integrated
Voltage Maximum Rating (Vdc) Output Capacitance (uF) Output Voltage Ripple (Vrms)
5 4235 0.5
10 1740 0.5
16 1740 0.5
20 775 0.7
25 775 0.7
32 775 1.4
40 760 1.5
50 760 1.5
60 760 1.5
80 110 1.5
100 110 1.6
125 70 1.6
160 70 1.6
200 70 1.6
250 70 1.6
300 70 1.8
375 70 1.8
400 70 1.8
500 40 2.1
600 40 2.3
800 30 2.5
1000 30 3.0
XR Series Output Stage Ratings with the High Slew Rate Output Option Integrated
Voltage Maximum Rating Output Capacitance (uF) Output Voltage Ripple (Vrms)
5 13200 0.5
10 4080 0.5
16 4080 0.5
20 2340 0.7
25 1170 0.7
32 1170 1.4
40 240 1.5
50 240 1.5
60 240 1.5
80 240 1.5
100 160 1.6
125 160 1.6
160 160 1.6
200 160 1.6
250 160 1.6
300 160 1.8
375 160 1.8
400 160 1.8
500 56 2.1
600 56 2.3
800 52 2.5
1000 52 3.0
1250 18 4.0
1500 18 4.5
2000 18 5.0
3000-10000 N/A N/A
TS Series and MS Series Output Stage Ratings with the High Slew Rate Output Option Integrated
Voltage Maximum Rating (Vdc) Output Capacitance (uF) Output Voltage Ripple (Vrms)
5 13200 0.5
8 9000 0.5
10 9000 0.5
16 4080 0.5
20 2340 0.7
25 2340 0.7
32 1170 1.4
40 1170 1.5
50 1170 1.5
60 300 1.5
80 300 1.5
100 200 1.6
125 200 1.6
160 200 1.6
200 200 1.6
250 200 1.6
300 200 1.8
375 200 1.8
400 200 1.8
500 200 2.1
600 120 2.3
800 70 2.5
1000 60 3.0
1250 18 3.5
1500 18 3.5
2000 18 3.5
3000 9 4.0
4000 9 4.0
Note:
For 20 to 30 kW models, multiply capacitance by 2
For 45 kW models, multiply capacitance by 3
For 60 kW models, multiply capacitance by 4
For 75 kW models, multiply capacitance by 5

For MT Series output stage ratings with the high slew rate output option, please inquire with your local sales partner regarding the specific model.