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Registered Member #60240
Joined: Mon May 16 2016, 07:01PM
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Posts: 304
Hi
Here are first results of measurements of the modulation of the high voltage output of a 50 kV power supply. The DC supply voltage for the high voltage power supply is 12.7 V, the modulation frequencies as well as the modulation input voltages are 500 Hz (5 Vss), 1 kHz (5 Vss), and 5 kHz (3 Vss).
The equipment: TEK 6015A, TEK 7854 with 7A26, Y1: 1V/cm, Y2: 5 kV/cm.
The zero line of the high voltage (5kV/cm) is at the bottom of the screen, the zero line of the modulation voltage (1V/cm) is in the center of the screen.
Modulation frequency is 500 Hz, modulation input voltage is 5 Vss, the high voltage is around 18 kV, the modulation amplitude is about 5 kVss.
Modulation frequency is 1 kHz, modulation input voltage is 5 Vss, the high voltage is around 20 kV, the modulation amplitude is about 5 kVss.
modulation frequency is 5 kHz, modulation input voltage is 3 Vss, the high voltage is around 30 kV, the modulation amplitude is about 5 kVss
At 5 kHz the high voltage amplitude increases up to 30 kV, although the DC supply voltage is still 12.7 V, and the modulation input voltage is only 3 Vss.
I am wondering how to increase the modulation depth. Please, has somebody some advice to solve this problem?
Registered Member #60240
Joined: Mon May 16 2016, 07:01PM
Location:
Posts: 304
Hi Patrick
Here is a picture of the power supply:
Technical data:
Input voltage: 12V - 24V DC Input current : max . 4A Output voltage: adjustable 0-30kVDC @ 12V and 24V @ 0-50kVDC Output voltage is adjustable Output current limit can be set modulation input
Registered Member #60240
Joined: Mon May 16 2016, 07:01PM
Location:
Posts: 304
Hi Erlend^SE and Patrick
Here are first results of measurements of the modulation of the high voltage output of a 50 kV power supply with a load of 5 MOhm. The DC supply voltage for the high voltage power supply is 12 V, the modulation frequencies as well as the modulation input voltages are 250 Hz, 500 Hz, and 1 kHz (6 Vss).
The equipment: TEK 6015A, TEK 7854 with 7A26, Y1: 2 V/cm, Y2: 2 kV/cm.
The zero line of the high voltage (2 kV/cm) is at the bottom of the screen, the zero line of the modulation voltage (2 V/cm) is in the center of the screen.
First picture: No modulation, supply voltage is 12 V, input current is 1,25 A, load is 5 Mohm, the high voltage is around 6 kV. In addtion the oscillation amplitude from the switching frequency at 20 kHz is about 2 kVss.
Second picture: Modulation frequency is 250 Hz, modulation input voltage is 6 Vss, DC supply voltage is 12 V, input current is 1,0 A, load is 5 Mohm, the high voltage is around 7 kV, the high voltage modulation amplitude is 2 kVss. In addtion the oscillation amplitude from the switching frequency at 20 kHz is about 2 kVss.
Third picture: Modulation frequency is 500 Hz, modulation input voltage is 6 Vss, DC supply voltage is 12 V, input current is 0,95 A, load is 5 Mohm, the high voltage is around 5 kV, the high voltage modulation amplitude is 3 kVss. In addtion the oscillation amplitude from the switching frequency at 20 kHz is about 2 kVss.
Fourth picture: Modulation frequency is 1 kHz, modulation input voltage is 6 Vss, DC supply voltage is 12 V, input current is 1,7 A, load is 5 Mohm, the high voltage is around 11 kVss, the high voltage modulation amplitude is about 8 kVss. In addtion the oscillation amplitude from the switching frequency at 20 kHz is up to 3 kVss.
Registered Member #60240
Joined: Mon May 16 2016, 07:01PM
Location:
Posts: 304
Hi Erlend^SE
The chip of the 50 kV power supply is at the following picture.
My plans to improve this circuit are:
1. short term improvement is to create a filter consisting of coils and capacitors to suppress the 20 kHz switching signal 2. long term improvement is to add a feed back loop also to supress the 20 kHz switching signal
But the very next important step will be to increase the voltage range of an AC HV-probe at lest up to 80 or 100 kV. I will try 1. a combination of an existing TEX P6015 and a high voltage resistor to build a voltage divider 2:1 or 3:1 2. a combination of an existing TEX P6015 and a series of capacitors also to build a voltage divider
Registered Member #60240
Joined: Mon May 16 2016, 07:01PM
Location:
Posts: 304
Hi Erlend^SE and Patrick
Here are first results of measurements of the modulation of the high voltage output of a 50 kV power supply with a load of 10 MOhm. The DC supply voltage for the high voltage power supply is 12 V, the modulation frequencies as well as the modulation input voltages are 250 Hz, 500 Hz, and 1 kHz (6 Vss).
The equipment: TEK 6015A, TEK 7854 with 7A26, Y1: 2 V/cm, Y2: 2 kV/cm.
The zero line of the high voltage (2 kV/cm) is at the bottom of the screen, the zero line of the modulation voltage (2 V/cm) is in the center of the screen.
First picture: No modulation, supply voltage is 12 V, input current is 1,25 A, load is 10 Mohm, the high voltage is around 10 kV. In addtion the oscillation amplitude from the switching frequency at 20 kHz is about 2 kVss.
Second picture: Modulation frequency is 250 Hz, modulation input voltage is 6 Vss, DC supply voltage is 12 V, input current is 1,0 A, load is 10 Mohm, the high voltage is around 10 kV, the high voltage modulation amplitude is 4 kVss. In addtion the oscillation amplitude from the switching frequency at 20 kHz is about 2 kVss.
Third picture: Modulation frequency is 500 Hz, modulation input voltage is 6 Vss, DC supply voltage is 12 V, input current is 0,95 A, load is 10 Mohm, the high voltage is around 10 kV, the high voltage modulation amplitude is 4 kVss. In addtion the oscillation amplitude from the switching frequency at 20 kHz is about 2 kVss.
Fourth picture: Modulation frequency is 1 kHz, modulation input voltage is 6 Vss, DC supply voltage is 12 V, input current is 1,7 A, load is 10 Mohm, the high voltage is around 14 kVss, the high voltage modulation amplitude is about 8 kVss. In addtion the oscillation amplitude from the switching frequency at 20 kHz is up to 3 kVss. I am looking forward to your comments.
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1 kHz Modulation of a 50 kV power supply
