Why did antifederalists fear an energetic central government ?

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The anti-federalists were composed of diverse elements, including those opposed to the Constitution because they thought that a stronger government threatened the sovereignty and prestige of the states, localities, or individuals; those that fancied a new centralized, disguised "monarchic" power that would only replace the cast-off despotism of Great Britain with the proposed government; and those who simply feared that the new government threatened their personal liberties. Some of the opposition believed that the central government under the Articles of Confederation was sufficient. Still others believed that while the national government under the Articles was too weak, the national government under the Constitution would be too strong. 

During the period of debate over the ratification of the Constitution, numerous independent local speeches and articles were published all across the country. Initially, many of the articles in opposition were written under pseudonyms, such as "Brutus", "Centinel", and "Federal Farmer". Eventually, famous revolutionary figures such as Patrick Henry came out publicly against the Constitution. They feared that the strong national government proposed by the Federalists was a threat to the rights of individuals and that the President would become a king. They objected to the federal court system created by the proposed constitution. 

This produced a phenomenal body of political writing; the best and most influential of these articles and speeches were gathered by historians into a collection known as the Anti-Federalist Papers in allusion to the Federalist Papers.

Anti-federalists feared such a overpowering and controlling government that America had only just escaped by declaring Independence from Great Britain