| 摘要 |
The present invention relates to a pulse type power supply circuit with bipolar variable output voltage, comprising: two stable power ends being in an insulation state; a control signal generating part for receiving a pulse signal of an arbitrary level outputted by a control board, driving an NPN transistor via a first pulse (pulse 1) and a base resistor, receiving a pulse signal occurring at a second pulse (pulse 2), delivering the pulse signal to a secondary side of a pulse transformer (PT), driving the NPN transistor via the base resistor and controlling output voltage; a positive voltage driving circuit part and a negative voltage driving circuit part receiving voltage from the power ends and driven according to a control signal from the control signal generating part; and a switching part controllable according to output signals of the positive voltage driving circuit part and the negative voltage driving circuit part. The present invention provides a power supply circuit capable of supplying a bipolar variable direct current power to an electrical and electronic device or an image device, which needs the bipolar variable direct current power, different from a traditional electrical and electronic device, which needs regular direct current power, thereby simplifying a system control operation via a simple configuration, enhancing operational reliability and improving shortcomings of lowering system efficiency caused by a traditional configuration made up of many elements. |
