High-voltage generating circuit

摘要

A high-voltage generating circuit (1) includes a high-voltage production circuit (28), a high-voltage detecting circuit (29) and a control circuit (30). The high-voltage production circuit (28) includes clamping diodes (6, 7) to provide a good response for stabilizing a high voltage. The control circuit (30) applies pulse-width control to a power source voltage (8). The high-voltage detecting circuit (29) has a high-voltage circuit section (29a) to which a voltage of 1 kV to several tens of kilovolts is applied and a low-voltage circuit section (29b) to which a voltage of several tens of volts is applied. The high-voltage circuit section (29a) comprises a parallel circuit including voltage-dividing resistors (9, 10, 11, 12) and a speed-up capacitor (14). The speed-up capacitor (14) is set to 1000 pF or less. <IMAGE>