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UPS (Uninterruptible Power Supply) cold-start circuit

A cold start and circuit technology, applied in the field of circuits, can solve problems such as high cost, poor safety, and difficult technical implementation

Inactive Publication Date: 2017-03-22
INVT POWER SYST SHENZHEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The embodiment of the present invention provides a UPS cold start circuit for UPS, which aims to solve the problems that the existing online UPS cold start circuit is not only poor in safety, but also difficult to implement and high in cost.

Method used

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  • UPS (Uninterruptible Power Supply) cold-start circuit
  • UPS (Uninterruptible Power Supply) cold-start circuit
  • UPS (Uninterruptible Power Supply) cold-start circuit

Examples

Experimental program
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Effect test

no. 1 example

[0023] Such as image 3 As shown, the embodiment of the present invention provides a UPS cold start circuit 100 applied to an online UPS system. The UPS cold start circuit 100 is connected to a battery unit 200 and a UPS system load unit 300 . Wherein, the battery unit 100 is a DC power supply, which is a device for maintaining a stable current in the circuit, such as a dry cell, a storage battery and the like. The UPS system load unit 300 is the load for starting the UPS. The UPS cold start circuit 100 provides the starting voltage for the UPS system load unit 300 to enter the normal working state, thereby realizing the cold start function of the battery unit 200 for the UPS system. In the present invention, the UPS cold start circuit 100 includes: a first isolation transformation unit 110 , a confluence unit 120 , and a second isolation transformation unit 130 .

[0024] In the embodiment of the present invention, the input end of the first isolation transformation unit 110...

no. 2 example

[0031] Such as Figure 4As shown, in the embodiment of the present invention, the first isolation conversion unit 110 is a flyback isolation converter. Specifically, in the flyback isolated converter: the anode of the diode D1 is connected to the positive pole of the battery unit, one end of the capacitor C1 is connected to the cathode of the diode D1, and the other end is connected to the negative pole of the battery unit, and the resistor R1 One end of the resistor R1 is connected to the cathode of the diode D1, the other end of the resistor R1 is connected to the cathode of the Zener diode ZD1, the anode of the Zener diode is connected to the battery unit, the capacitor C2 is connected in parallel with the Zener diode ZD1, and one end of the capacitor C3 is connected to the diode The cathode of D1 is connected, the other end of capacitor C3 is connected to the cathode of diode D2, the resistor R2 is connected in parallel with C3, one end of the primary side of the flyback i...

no. 3 example

[0040] Such as Figure 5 As shown, in this embodiment of the present invention, different from the second embodiment, the first isolation conversion unit 110 in the embodiment of the present invention is a forward isolation converter.

[0041] In the embodiment of the present invention, the first isolation conversion unit 110 is composed of main parts such as a forward isolation transformer T1, a switch tube Q1, a PWM control chip U1, a diode D6, and a first voltage feedback network. Wherein, the input terminal of the first isolation conversion unit 110 is connected to the positive and negative poles of the battery unit 200, and the voltage of the battery unit 200 is chopped by the switching tube Q1 controlled by the PWM control chip U1, and then the first isolation conversion unit 110 outputs a certain voltage value The first DC voltage, such as 200V, is sent to the PWM control chip U1 of the first isolation conversion unit 110 after being processed by the first voltage feedb...

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Abstract

The invention is suitable for the circuit field and provides an UPS (Uninterruptible Power Supply) cold-start circuit. The UPS cold-start circuit is connected with a battery unit and a UPS system load unit. The UPS cold-start circuit comprises a first isolation transformation unit, a conflux unit, and a second isolation transformation unit. The input end of the first isolation transformation unit is connected with the battery unit; the conflux unit has a plurality of input ends which can input a power supply voltage, and the output end of the first isolation transformation unit is connected with the first input end of the plurality of input ends of the conflux unit; and the input end of the second isolation transformation unit is connected with the output end of the conflux unit, and the output end of the second isolation transformation unit is connected with the UPS system load unit. The negative of the battery unit and the output end of the UPS system are electrically isolated from the mains zero line, and the electric energy of the battery unit is converted into the working power supply of the UPS system, so that the UPS system is started by the battery unit without the mains supply, and the UPS system is directly started without influencing the mains supply. The circuit is easy to implement, the cost is low, and the operation of the UPS system is enabled to be more safe and reliable.

Description

technical field [0001] The invention belongs to the field of circuits, in particular to a UPS cold start circuit. Background technique [0002] UPS (Uninterruptible Power System / Uninterruptible Power Supply, uninterruptible power supply) is a system device that connects the battery to the host, and converts DC power into commercial power through a module circuit such as the host inverter. It is mainly used to provide stable and uninterrupted power supply to a single computer, computer network system or other power electronic equipment such as solenoid valves and pressure transmitters. Commonly used UPSs include online UPS systems. Regardless of whether the grid voltage is normal or not, the AC voltage used by the load must pass through the inverter circuit, that is, the inverter circuit is always in working condition. The online UPS is generally a double-conversion structure. Conversion means that when the UPS is working normally, the electric energy is supplied to the load...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J9/06
CPCH02J9/061
Inventor 文洋夏小荣王行宏利全东
Owner INVT POWER SYST SHENZHEN CO LTD
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