KR960027136A - Uninterruptible power supply - Google Patents

Abstract

Since the conventional uninterruptible power supply is configured to include two exchangers of an AC / DC converter and a DC / DC converter, in order to solve the disadvantage that the circuit configuration is complicated and the power efficiency becomes very low, the present invention provides a It has a structure in which two switching elements are connected to one transformer, and these switching elements are driven and controlled by the first and second PWM control signals supplied from the PWM control unit and according to whether the power failure is detected by the electrostatic detection unit. As the control signal is selectively outputted, one switching element is controlled by the first PWM control signal during normal power input to supply DC power with a predetermined voltage to the system and to charge the battery, while the second PWM during power failure. The other switching element is controlled by the control signal and is always used in the system by using the power supply voltage discharged from the battery. It provides an uninterruptible power supply for SMPS that can simplify the circuit configuration to supply a constant DC power supply voltage and improve the power efficiency.

Description

Uninterruptible power supply

Since this is an open matter, no full text was included.

2 is a circuit diagram showing an embodiment of an uninterruptible power supply according to the present invention.

Claims (5)

Connected to the AC input power supply terminal detects the power failure 10, the transformer (60) having a primary winding (NP ₁ ) (NP ₂ ) (NP ₃ ) and the secondary winding (NS ₁ ), the Rectified and smoothed AC input power to a DC power source is connected to the first rectifier 50 for applying to the primary side winding (NP ₁ ) of the transformer 60, the secondary side winding (NS ₁ ) of the transformer 60 The second rectifying unit 70 rectifies and smoothes the AC power induced in the secondary winding NS ₁ to a DC power supply having a predetermined voltage, and is connected to the primary winding NP ₃ of the transformer 60 and the other primary side. The charging unit 30 which supplies a charging voltage to the battery 3 connected to the winding NP ₂ , and optionally the first or second PWM control signal CS ₁ (CS ₂ ) according to the detection signal of the power failure detection unit 10. and operating, controlled by the PWM control unit 20, the first 1PWM control signal (CS ₁₎ which outputs a first switching element for switching control of the DC power applied to the primary winding of the transformer (60) (NP _1), (Q _1), and, DC power source operatively controlled by the power failure is detected during the first 2PWM control signal (CS ₂₎ is discharged from the battery (3) is applied to the primary winding (NP ₂₎ of the transformer (60) Uninterruptible power supply comprising a second switching element (Q ₂ ) for controlling the switching. The uninterruptible power supply of claim 1, further comprising a feedback unit 40 for returning the DC power supply voltage output from the second rectifying unit 70 to the PWM control unit 20 as a control signal of the PWM control unit 20. Power supply. 2. The uninterruptible power supply according to claim 1, wherein the first and second switching elements (Q ₁ ) (Q ₂ ) are transistors. 2. The uninterruptible power supply according to claim 1, wherein said first and second switching elements (Q ₁ ) (Q ₂ ) are field effect transistors. 2. The uninterruptible power supply of claim 1, wherein the charging unit 30 is controlled by a detection signal of the electrostatic detection unit 10 to shut off the supply of charging voltage to the battery 3 during a power failure. Feeder. ※ Note: The disclosure is based on the initial application.