Charge equalization circuit for an energy store having a multiplicity of energy storage cells and modules connected in series, having a transformer with a primary-side winding and with a multiplicity of secondary-side windings, characterized by the following features: - an inverter, the input connections of which are coupled to connections (6a, 6b) of the energy store, and which is designed to convert the total voltage of the energy store into an equalization voltage, - the transformer is coupled to the inverter, - a multiplicity of rectifiers which are coupled in each case to one of the multiplicity of secondary-side windings and are designed to rectify the equalization voltage of the inverter and to feed the rectified equalization voltage into in each case one of the multiplicity of energy storage cells and modules, - a control apparatus which is coupled to the inverter, the transformer also having a secondary-side auxiliary winding which is coupled to the control apparatus, characterized in that - the control apparatus is designed to set the level of the equalization voltage on the basis of the total voltage of the energy store and the number of energy storage cells and modules of the energy store and/or to record the equalization voltage via the secondary-side auxiliary winding and to regulate the inverter on the basis of the recorded equalization voltage, and - a multiplicity of filter stages are provided and are each coupled between the multiplicity of rectifiers and the multiplicity of energy storage cells and modules, the multiplicity of filter stages each having low-pass filters with a coil as a series two-terminal network and a capacitor as a parallel two-terminal network, and are designed to smooth the rectified equalization voltage. - an inverter, the input connections of which are coupled to connections (6a, 6b) of the energy store, and which is designed to convert the total voltage of the energy store into an equalization voltage, - the transformer is coupled to the inverter, - a multiplicity of rectifiers which are coupled in each case to one of the multiplicity of secondary-side windings and are designed to rectify the equalization voltage of the inverter and to feed the rectified equalization voltage into in each case one of the multiplicity of energy storage cells and modules, - a control apparatus which is coupled to the inverter, the transformer also having a secondary-side auxiliary winding which is coupled to the control apparatus, characterized in that - the control apparatus is designed to set the level of the equalization voltage on the basis of the total voltage of the energy store and the number of energy storage cells and modules of the energy store and/or to record the equalization voltage via the secondary-side auxiliary winding and to regulate the inverter on the basis of the recorded equalization voltage, and - a multiplicity of filter stages are provided and are each coupled between the multiplicity of rectifiers and the multiplicity of energy storage cells and modules, the multiplicity of filter stages each having low-pass filters with a coil as a series two-terminal network and a capacitor as a parallel two-terminal network, and are designed to smooth the rectified equalization voltage.