{"id":441,"date":"2012-07-15T16:41:06","date_gmt":"2012-07-15T16:41:06","guid":{"rendered":"http:\/\/www.bartola.co.uk\/valves\/?p=441"},"modified":"2012-07-15T19:32:37","modified_gmt":"2012-07-15T19:32:37","slug":"new-ht-bench-power-supply-600v","status":"publish","type":"post","link":"https:\/\/www.bartola.co.uk\/valves\/2012\/07\/15\/new-ht-bench-power-supply-600v\/","title":{"rendered":"New HT bench power supply (+600V)"},"content":{"rendered":"

Here is my first test of modified bench supply providing 600Vdc from existing 250V transformer via a voltage multiplier circuit, gyrator filter and passive MOSFET regulator. This circuit was built with components I had around and supply provides 0-600V with less than 5mV ripple thanks to the 53dB attenuation. Maximum current is 100mA continuous but passive regulator has a 200mA limiter built in.<\/p>\n

\"20120715-174052.jpg\"<\/a><\/p>\n

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bench raw supply<\/figcaption><\/figure>\n

Above is a classic voltage-doubler configuration. I had a 250V secondary, so had to add one of this to get HT to 600V at least. Resistor equalisers have been added to leverage whatever electrolytic I had around and could use here. The raw supply should provide a low ripple of about 1.3Vpp at full load (100mA).<\/p>\n

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Gyrator-based active smoothing filter<\/figcaption><\/figure>\n

A classic gyrator to simulate an inductor in an LC stage. Attenuation of this stage and the passive regulator which is configured as a capacitor multiplier can provide at least 53dB @ 100Hz. This will bring down the ripple to less than 5mV!<\/p>\n

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Passive regulator with current limiter<\/figcaption><\/figure>\n

Finally the passive regulator. It has a current limiter set to 200mA. M2 will dissipate large amounts of heat. Just do the maths: dropping circa 600V to whatever voltage is set as the output by the 1M pot. This will be bolted to the chassis C shaped aluminium frame. \u00a0Probably needs a bigger heatsink as could melt down when delivering large currents at low output voltage. This is a situation we want to avoid. Output will have a slow fuse of around 100mA, but the circuit has a 200mA current protection to avoid killing the MOSFET whilst charging a capacitor,etc.<\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

Here is my first test of modified bench supply providing 600Vdc from existing 250V transformer via a voltage multiplier circuit, gyrator filter and passive MOSFET regulator. This circuit was built with components I had around and supply provides 0-600V with less than 5mV ripple thanks to the 53dB attenuation. Maximum current is 100mA continuous but … Continue reading “New HT bench power supply (+600V)”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[5],"tags":[115],"class_list":["post-441","post","type-post","status-publish","format-standard","hentry","category-valves","tag-ht-supply"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p2r2tK-77","jetpack_likes_enabled":true,"jetpack-related-posts":[],"_links":{"self":[{"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/posts\/441","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/comments?post=441"}],"version-history":[{"count":3,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/posts\/441\/revisions"}],"predecessor-version":[{"id":444,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/posts\/441\/revisions\/444"}],"wp:attachment":[{"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/media?parent=441"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/categories?post=441"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bartola.co.uk\/valves\/wp-json\/wp\/v2\/tags?post=441"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}