Here is the circuit of 12V to -165V 100mA DC converter. This circuit uses the MAX668 and a transformer (which will need about a one-to-six turns ratio) to build a flyback converter. The op-amp module is used to invert the feedback from the negative output voltage.
The circuit produces -165V at 100mA from a +12V input. Primarily based on a MAX668 transformer flyback application, the circuit utilizes a custom transformer to produce -165V through a combination of turns ratio and duty cycle. The transformer is designed on an SG5-size bobbin to facilitate the winding and to reduce the leakage inductance.
D2 is preferred as a fast-recovery diode to moderate the cost for a high-breakdown voltage part. Since the diode will see 165V + (6 x Vin) + flyback due to leakage inductance, a 600V rating is required. C3 is selected as a film capacitor to get high voltage rating and high ripple-current capacity.
The MAX668 is designed for a wide range of DC-DC conversion applications including step-up, SEPIC, flyback, and isolated-output configurations. Power levels of 20W or more can be controlled with conversion efficiencies of over 90%. The 1.8V to 28V input voltage range supports a wide range of battery and AC-powered inputs. An advanced BiCMOS design features low operating current (220µA), adjustable operating frequency (100kHz to 500kHz), soft-start, and a SYNC input allowing the MAX668 oscillator to be locked to an external clock.
Download MAX668 datasheet
Source: www.maxim-ic.com
About Inverter
An inverter is an power electronic device that converts direct current (DC) to alternating current (AC); the converted AC can be at any required voltage and frequency with the use of appropriate transformers, switching, and control circuits. Solid-state inverters have no moving parts and are used in a wide range of applications, from small switching power supplies in computers, to large electric utility high-voltage direct current applications that transport bulk power. Inverters are usually used to supply AC power from DC sources such as solar panels or batteries. It will be useful for emergency electric source
An inverter is an power electronic device that converts direct current (DC) to alternating current (AC); the converted AC can be at any required voltage and frequency with the use of appropriate transformers, switching, and control circuits. Solid-state inverters have no moving parts and are used in a wide range of applications, from small switching power supplies in computers, to large electric utility high-voltage direct current applications that transport bulk power. Inverters are usually used to supply AC power from DC sources such as solar panels or batteries. It will be useful for emergency electric source
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