1000V output non-optocoupler isolation DC-DC power supply circuit

Abstract

The invention discloses a 1000V output non-optocoupler isolation flyback DC-DC power supply circuit. The system comprises a dedicated DC-DC switching power supply control chip LT8304-1, a flyback isolation transformer module T1, a rectifier diode, a filter capacitor and a voltage output control module. The flyback isolation transformer comprises a primary winding and three independent secondary windings. The primary winding and the secondary windings are electrically isolated, and the turns ratio of the primary winding and the secondary windings is 1:10:10:10. The power supply improves the load regulation capability without an external load compensation component. The output current capability increases with the input voltage increasing. By sampling the isolated output voltage directly from the primary side flyback waveform, a voltage divider and an optical isolator are not needed; the 1000V output non-optocoupler isolation flyback DC-DC power supply circuit has a temperature compensation function, can compensate the output errors of the rectifier diode caused by temperature change and meets the application occasions of high voltages, isolation, wide temperatures and small sizes, and the power supply can supply excellent voltage stabilization performance with the change of the load, the voltage and the temperature.

Description

technical field [0001] The invention relates to the field of switching power supplies, in particular to a 1000V output DC-DC power supply circuit without optocoupler isolation. Background technique [0002] The existing isolated high-voltage DC-DC power supply uses a voltage-type pulse width modulator, and the voltage-stabilizing feedback loop uses a transformer, a photocoupler and an auxiliary circuit to sample the output voltage and feed back the error signal to the primary-side controller; this voltage There are some problems in the type isolated high-voltage DC-DC module: DC-DC module voltage regulation rate, load regulation rate and output energy efficiency are low, and additional components such as transformers and optocouplers increase the cost and physical size of the power supply and reduce the reliability of the module; The rectifier diode is affected by the temperature change of the working environment and the output accuracy of the high-voltage DC-DC module. Co...

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Problems solved by technology

[0002] The existing isolated high-voltage DC-DC power supply uses a voltage-type pulse width modulator, and the voltage-stabilizing feedback loop uses a transformer, a photocoupler and an auxiliary circuit to sample the output voltage and feed back the error signal to the primary-side controller; this voltage There are some problems in the type isolated high-voltage DC-DC module: DC-DC mo

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