KR960019928A - Power converter - Google Patents

Abstract

The present invention relates to a power converter for converting a direct current power source into an alternating current power source, and more particularly, to a power converter configured to detect a trouble on a power supply side and an abnormal state on a load side to simultaneously protect a power converter and a load. Detects the power level on the input power side to cut off the power supplied to all circuits in case of overvoltage, and keeps this cut-off state, and forms a current transformer (CT) at the AC output stage to detect the overload state on the load side. It is possible to cut off and hold the power supplied to all circuits, and provide a power control device that can immediately cut off the power supplied to all circuits and hold this state at the time of load side short circuit through the current transformer. Level drive the output status of load side through In order to provide a power conversion device capable of providing a power conversion device, a power detection means for detecting a power level is formed on the power input side of the power conversion device, and through this power detection means, switching power is supplied to all circuits in the subsequent stage. To cut off the power supply when the trouble occurs and to keep the cut-off state, the current transformer to detect the output state at the AC output stage, the overload detection means operating at the overload cut-off level to this current transformer, the short circuit detection means operating at the load short circuit, It is made as a level display means for displaying the output level by driving the overload detection means or the short-circuit detection means to drive the power supply means to cut off the power supply to all the circuits of the rear stage. As a result, it is possible to protect the circuit from extreme overvoltage on the power input side, and at the same time, it is a power converter that can protect the circuit by overload and short circuit on the load side.

Description

Power converter

As this is a public information case, the full text was not included.

2 is a block diagram showing a power conversion device comprising the present invention,

3 is a detailed circuit diagram as an embodiment of FIG.

Claims (2)

A push-pull switching FET that saturates the boost transformer from the capacitor power input terminal DCIN to the pulse width modulation method (PWM), and a DC-DC converter 100 and a DC-DC converter 100 for converting the boosted transformer secondary side voltage into DC. DC-AC inverter (200) is generated as an AC output through a load drive circuit composed of FETs which are point-symmetrically driven FETs, and has an output regulation circuit for switching and controlling this load lamp circuit at a commercial frequency. In the power conversion device comprising a) and the operation state display unit 300, and detects the battery power (DC ⁺ ) and applies the power to the circuit of the rear stage when the normal, and if abnormal, cut off the power applied to the rear circuit. The power detecting means 10 is maintained between the capacitor power input terminal DCIN and the DC-DC converter 100 and maintains an output level at the AC output terminal ACOUT of the DC-AC inverter 200. Current transformer (CT) to detect And an overload detecting means 20 for switching the power detecting means 10 to a cutoff state in an overload state as compared with the load-side overload level, and for switching the power detecting means 10 to a cutoff state at a load short circuit level. A short-circuit detecting means 30 and a level display means 40 made of LEDs for displaying the output level detected through the current transformer CT, wherein the set / reset for resetting the power detecting means 10 is performed. Power conversion device comprising a unit (50). The voltage detecting unit (1) of claim 1, wherein the voltage detecting unit (1) is grounded at the input terminal (DCIN) of the capacitor power supply (DC ⁺ ) with a resistor (R ₁ ), a zener diode (ZD) forward diode (D ₁ ), and a resistor (R ₂ ). Power switch ₂ consisting of a relay RY and a check diode D ₂ connected to a battery power source DC ⁺ , a transistor Q ₁ and a resistor R ₄ and R ₅ for switching the relay RY. The switching part 3 of (C ₁ ) and the gate of the thyristor SCR for limiting the transistor Q ₁ base potential of the switching part 3 are located after the diode D ₁ of the voltage detection part 1. The anode is connected to the base resistor R ₄ via the resistor R ₃ and formed as a cathode grounded state monitor 4 to form a voltage sensing unit 10 ′, and a current transformer at the AC output terminal ACOUT. (CT) is formed and provided to the non-inverting input terminal of the level comparator 11 formed of the resistors R ₆ to R ₁₀ , the capacitors C _{2 to} C ₅ , and the level comparators COM, through the variable resistor VR. Enters the reference level A half-wave rectifier circuit having a diode (C ₃ ) resistor (R ₁₁ ) and a capacitor (C ₆ ) at the output terminal of the level comparator (11). 12, a transistor (Q9) and a resistor (R ₁₂₎ and capacitor (C _7, C _8), the buffer circuit 13 and the diode in (D ₄₎ resistance (R ₁₃ ~R _19), capacitor (C ₉ , C ₁₎ and the comparator (COM ₂₎ the overload output circuit 14 is connected to the buffer circuit 13 is output to the non-inverting input terminal and inverting input terminal is connected to the reference voltage, the overload detector (20 'consisting of a) Is connected to the thyristor (SCR) gate of the power supply sensing section 10 'and branched from the variable resistor VR to resistors R ₂₁ to R ₂₃ , diodes D _{5 to} D ₆ , and a transistor ( Q ₃ ) is connected to the thyristor (SCR) gate of the power supply sensing section 10 'and outputted from the short circuit detecting section 30' and branched from the variable resistor VR to resistors R ₂₄ to R. ₂₆ ), a capacitor (C _{11 to} C ₁₃ ) and a level drive array (IC ₁ ) and a level display section 40 'consisting of a level display LED, which is connected to the switch SW from the power supply DC ⁺ . Characterized in that the diode D ₇ output of the set / reset section 50 'connected to the forward diode D ₁ is connected to the resistor R ₃ of the voltage sensing section 10'. Inverter. ※ Note: The disclosure is based on the initial application.