CN102377247A

CN102377247A - Power supply device with monitoring function

Info

Publication number: CN102377247A
Application number: CN2011104007260A
Authority: CN
Inventors: 禹世源
Original assignee: SUZHOU EMK ELECTRONICS CO Ltd
Current assignee: SUZHOU EMK ELECTRONICS CO Ltd
Priority date: 2011-12-06
Filing date: 2011-12-06
Publication date: 2012-03-14
Anticipated expiration: 2031-12-06
Also published as: CN102377247B

Abstract

The invention discloses a power supply device with monitoring function. The power supply device comprises an alternating-current input end, a switching power supply, a 220V alternating-current output end and a direct-current output end, wherein the output of the switching power supply is connected with the direct-current output end. The power supply device is characterized in that: the alternating-current input end consists of a 380V alternating-current two-phase input end and a zero line input end; and the output of the switching power supply is controlled by under-voltage detection after the 380V alternating current is rectified and filtered and over-voltage detection after the 220V alternating current is rectified and filtered, and the 220V alternating-current output is controlled by a relay or a contactor at the same time, so that the power supply is monitored. A 380V-220V large transformer is not needed in the power supply device, so that metal materials such as copper wires and silicon steel plates can be saved, and energy conservation and emission reduction are realized; and through an internal monitoring circuit, the mains 220VAC electric equipment is protected from being damaged during error connection.

Description

A kind of supply unit with monitoring function

Technical field

The present invention relates to a kind of supply unit, be specifically related to a kind of supply unit of the input power supply being monitored and provided civil power and direct current output.

Background technology

Electrical control cubicles need provide 380VAC, 220VAC, direct voltage (such as 24VDC, 12VDC, 5VDC, selecting output as required) etc. to give the power supply of load power consumption equipment usually.

In the prior art, realize that the method for above-mentioned power supply mainly contains: 1. electrical control cubicles only inserts three-phase 380V AC, and 380V AC becomes 220V AC through transformer, and 220V AC power consumption equipment just is connected on the secondary (outlet side) of transformer then.Solve 220V AC power voltage supply problem by this method, then through 220VAC Switching Power Supply output dc voltage (, selecting output as required) such as 24VDC, 12VDC, 5VDC.The transformer that this kind method needs very big copper and silicon steel sheet to form, this kind transformer weight is very heavy, and cost is very high.2. electrical control cubicles inserts three-phase 380V AC and civil power 220V AC simultaneously, then through 220VAC Switching Power Supply output dc voltage (such as 24VDC, 12VDC, 5VDC, selecting output as required).This method need not be provided with high-power transformer, and cost is lower.Gone into two phases of three-phase 380V AC to civil power 220V AC misconnection but in the wiring process, occur mistake easily at incoming end, perhaps the zero line of 220V AC breaks off from the center, can cause the power consumption equipment of some mains-supplied to be invaded because of high pressure like this and damage; Simultaneously, if 220V AC input has inserted two phases of 380V AC by error, then Switching Power Supply can be damaged.

Therefore, how providing a kind of cost lower and can solve the supply unit of the shortcoming of above-mentioned the 2nd kind of method, is the problem that industry need solve.

Summary of the invention

Goal of the invention of the present invention provides a kind of supply unit with monitoring function, has when the output of 220 volts of alternating voltages exports with direct current, prevents that input 220V electric main from being gone into three phase mains by misconnection.

For reaching the foregoing invention purpose; The technical scheme that the present invention adopts is: a kind of supply unit with monitoring function; Comprise ac input end, Switching Power Supply, 220 volts of ac output ends and dc output end; The output of Switching Power Supply connects dc output end, and said Switching Power Supply comprises PWM driver element and direct voltage HF power conversion unit; Said ac input end exchanges two phase inputs by 380 volts and the zero line input constitutes; Said 380 volts of interchange two phase inputs connect PWM driver element, direct voltage HF power conversion unit and under-voltage testing circuit behind rectification circuit, filter circuit; Said 380 a volts of wherein phase input and zero line inputs that exchange are connected to 220 volts of ac output ends through the output loop of relay or contactor; 220 volts of alternating voltages insert the electric voltage over press testing circuit behind rectifying and wave-filtering; The output control PWM driver element of said under-voltage testing circuit and electric voltage over press testing circuit, when detecting under-voltage or overvoltage, the PWM driver element stops output; One road direct current output of Switching Power Supply connects the input circuit of relay road or contactor, constitutes 220 and exchanges output control unit.

In the preceding text, direct current output exchanges two by 380 volts and imports mutually through PWM driver element and the acquisition of direct voltage HF power conversion cell translation; 220 volts of interchange outputs obtain through relay or contactor, and input is 380 volts of two phase and zero lines that exchange, when wiring error appears in these three lines; The under-voltage testing circuit with or electric voltage over press testing circuit output signal, make the PWM driver element stop output, then direct voltage also stops output immediately; Relay or contactor break off, and direct voltage exchanges all and can not export with 220 volts, thereby plays the monitoring and protection effect; When mains fluctuations are excessive, also can play same protective effect.

Optimized technical scheme, said PWM driver element, under-voltage testing circuit and electric voltage over press testing circuit are made up of the circuit in a slice PWM chip for driving.

In the technique scheme, the rectifying and wave-filtering of said 220 volts of alternating voltages adopts half-wave rectifying circuit and capacitor filtering to realize.

Said direct voltage HF power conversion unit is made up of double tube positive exciting translation circuit, high-frequency isolation transformer and output rectifier and filter.

Also be provided with sampling feedback voltage stabilizing circuit, output overcurrent protective circuit, output over-voltage protection circuit, thermal-shutdown circuit and blower fan temperature control circuit in the said Switching Power Supply.

Because the technique scheme utilization, the present invention compared with prior art has advantage:

1. the present invention need not use 380 volts of-220 volts of high-power transformers, can save metal material copper wire, silicon steel sheet, realizes energy-saving and emission-reduction;

2. the present invention inserts 380 volts and 220 volts of power supplys simultaneously; Through the internal control circuit; Civil power 220V AC power consumption equipment can not be damaged when guaranteeing that the 380V alternating current is gone in misconnection; Compare with in same circuit, only inserting a kind of AC power usually, thisly realize that through inserting two kinds of AC powers (380 volts and 220 volts) simultaneously cross monitoring has obtained beyond thought effect with the mode of avoiding error connection, creative.

Description of drawings

Fig. 1 is the theory diagram of the embodiment of the invention one.

Embodiment

Below in conjunction with accompanying drawing and embodiment the present invention is further described:

Embodiment one: referring to shown in Figure 1, a kind of supply unit with monitoring function comprises ac input end: 380 volts of R in exchanging two reach zero line N with S mutually mutually mutually, import so that 380 volts and 220 volts of two kinds of voltages to be provided; Switching Power Supply, 220 volts of ac output ends and dc output end, the output of Switching Power Supply connects dc output end, and said Switching Power Supply comprises PWM driver element and direct voltage HF power conversion unit; Said 380 volts of interchange two phase inputs connect PWM driver element, direct voltage HF power conversion unit and under-voltage testing circuit behind rectification circuit, filter circuit; Said 380 a volts of wherein phase input and zero line inputs that exchange are connected to 220 volts of ac output ends through the output loop of relay or contactor; 220 volts of alternating voltages insert the electric voltage over press testing circuit behind rectifying and wave-filtering; The output control PWM driver element of said under-voltage testing circuit and electric voltage over press testing circuit, when detecting under-voltage or overvoltage, the PWM driver element stops output; The PWM driver element stops output, and then direct voltage also stops output immediately; By output dc voltage connect relay or contactor line bag L1 loop, constitute 220V and exchange output control unit.

In the present embodiment; The bridge rectifier of said rectification circuit for constituting by diode D1, D2, D3, D4; Said filter circuit is made up of resistance R 1, R2 and capacitor C 1, C2, and said PWM driver element, under-voltage testing circuit and electric voltage over press testing circuit are made up of the circuit in a slice PWM chip for driving; The rectifying and wave-filtering of said 220 volts of alternating voltages adopts the half-wave rectifying circuit of diode D5 formation and the filter circuit realization that capacitor C 3 constitutes.Said direct voltage HF power conversion unit is made up of double tube positive exciting translation circuit, high-frequency isolation transformer and output rectifier and filter.

Claims

1. supply unit with monitoring function; Comprise ac input end, Switching Power Supply, 220 volts of ac output ends and dc output end; The output of Switching Power Supply connects dc output end, and it is characterized in that: said Switching Power Supply comprises PWM driver element and direct voltage HF power conversion unit; Said ac input end exchanges two phase inputs by 380 volts and the zero line input constitutes; Said 380 volts of interchange two phase inputs connect PWM driver element, direct voltage HF power conversion unit and under-voltage testing circuit behind rectification circuit, filter circuit; Said 380 a volts of wherein phase input and zero line inputs that exchange are connected to 220 volts of ac output ends through the output loop of relay or contactor; 220 volts of alternating voltages insert the electric voltage over press testing circuit behind rectifying and wave-filtering; The output control PWM driver element of said under-voltage testing circuit and electric voltage over press testing circuit, when detecting under-voltage or overvoltage, the PWM driver element stops output; One road direct current output of Switching Power Supply connects the input circuit of relay road or contactor, constitutes 220 and exchanges output control unit.

2. the supply unit with monitoring function according to claim 1 is characterized in that: said PWM driver element, under-voltage testing circuit and electric voltage over press testing circuit are made up of the circuit in a slice PWM chip for driving.

3. the supply unit with monitoring function according to claim 1 is characterized in that: the rectifying and wave-filtering of said 220 volts of alternating voltages adopts half-wave rectifying circuit and capacitor filtering to realize.

4. the supply unit with monitoring function according to claim 1 is characterized in that: said direct voltage HF power conversion unit is made up of double tube positive exciting translation circuit, high-frequency isolation transformer and output rectifier and filter.

5. the supply unit with monitoring function according to claim 1 is characterized in that: also be provided with sampling feedback voltage stabilizing circuit, output overcurrent protective circuit, output over-voltage protection circuit, thermal-shutdown circuit and blower fan temperature control circuit in the said Switching Power Supply.

6. the supply unit with monitoring function according to claim 1 is characterized in that: said Switching Power Supply has dc output end and ac output end simultaneously.