CN1172418C - Power supply equipment with parallelly connected two PC power supplies - Google Patents

Abstract

The present invention relates to a power supply device with two AC power sources connected in parallel, which is composed of a power supply circuit. The power supply device with two AC power sources connected in parallel comprises a power source unit, a rectification unit, a voltage stabilizing unit and a detection switching unit which detects the potential of an input power source and switches for selection at the input ends of two groups of AC power sources. The two groups of AC input power sources are connected according to the structure, and after the voltage of the first group of input power source is reduced and stabilized, the potential value of the input power source is judged so as to judge which group of power sources are switched to supply power at proper time; thus, when the voltage at the end of the first group of power source is insufficient, the other group of power source can be automatically switched to supply power so as to prevent the loss caused by midway current failure and endured by people.

Description

The power supply unit of tool two AC power supply parallel connection

Technical field

The invention relates to the power supply unit of a kind of tool two AC power supply parallel connection, refer to a kind of differentiation input power supply potential height especially, select the input power supply and do the power supply unit that continues the power supply supply to reach switching.

Background technology

Press, using machine or instrument at present, want that least the thing of running into is exactly that the situation that in use runs into power voltage insufficient or outage on the way takes place, it can cause the great loss of user, therefore sell multiple UPS or power supply unit remedies or might produce the problem of outage and voltage instability in response to power supply having on the market, but these not circuit breaker be the method that adopts the saturated back standby of charging, so it still has the restriction of service time, and aspect power supply unit, normally utilize one group of power supply to supply stable voltage, therefore as can cause user's puzzlement when running into the unstable or outage of input terminal voltage, so how there to be which kind of method can make the user have more convenient can a need again to take place now, be a problem worth thinking deeply about with respect to the problem of voltage instability.

This shows that existing power supply unit still has improvement and the space of creating, and still treats further thinking.

Summary of the invention

Therefore, the main purpose of the present invention is at the power supply unit that the parallel connection of a kind of tool two AC power supply is provided, be to prepare two groups of input power supplys simultaneously, when wherein one group voltage instability or when outage can be powered by another group power supply by detecting automatically switch, so that power supply unit can improve the problem of existing voltage instability.

For reaching aforementioned purpose, source, the Shen supply of a kind of tool two AC power supply of the present invention parallel connection is characterized in that it includes:

One power subsystem is made up of two groups of ac power input ends and a power output end;

One step-down rectifier unit is to obtain power supply via a power input of power subsystem and produce the working power of a direct current low-voltage;

One voltage regulation unit is that the working power of step-down rectifier unit is carried out voltage stabilizing;

One detects switch unit, is to detect the input power supply potential and do switching at aforementioned two groups of ac power input ends and power output end to be connected;

This power subsystem is made up of power supply first input and second input and a power output end;

This step-down rectifier unit is that resistance and electric capacity and a bridge rectifier are formed; Wherein: the filter circuit that the input connection one of bridge rectifier is made up of resistance and electric capacity, the input of its filter circuit be connected to power subsystem by a fuse first power input to obtain the input power supply, the output of this bridge rectifier is to be connected to voltage regulation unit by an electric capacity;

This voltage regulation unit is made up of two Zener diodes and a resistance and a transistor; Wherein this transistorized base stage is the output that is connected to bridge rectifier by the Zener diode that a resistance is connected with two, and transistorized emitter-base bandgap grading is to be connected to detect in the switch unit;

This detection switch unit is made up of a bridge rectifier, optical coupler, a voltage comparator, a transistor AND gate two relays; Wherein the input of this bridge rectifier is the input that connects the step-down rectifier unit, the bridge rectifier output is to be connected to optical coupler by resistance, the gate of this voltage comparator is the output that is connected to optical coupler by resistance and electric capacity in addition, the anode of voltage comparator is to be connected to transistorized base stage, and transistor then is connected to the coil place of two relays respectively with the collection utmost point;

The action connection point common ends of two relays is to be connected to power output end respectively, and it is often opened with normally closed contact and then is connected with first, second power input respectively, selects to be connected to power output end by that group power input so can be switched by two relays.

Description of drawings

For making the auditor further understand aforementioned purpose and architectural feature, below in conjunction with embodiment and accompanying drawing describes in detail as after, wherein:

Fig. 1 is a detailed circuit diagram of the present invention.

Embodiment

The detailed circuit of relevant the present invention part, see also shown in Figure 1, its mainly be a power supply circuit 10 its include:

One power subsystem 11 is made up of two groups of ac power input ends 111,112 and a power output end 113.

One step-down rectifier unit 12 is to obtain power supply via the power input 111 of power subsystem 11 and produce the working power of a direct current low-voltage;

One voltage regulation unit 13 is that the working power of step-down rectifier unit 12 is carried out voltage stabilizing;

One detects switch unit 14, is to detect the input power supply potential and do switching at aforementioned two groups of ac power input ends 111,112 with power output end 113 to be connected; Wherein:

This step-down rectifier unit 12 is made up of resistance R 7, R11 and capacitor C 1, C2, C3 and a bridge rectifier 122; Wherein: the input of bridge rectifier 122 connects one by resistance R 7, R11 and capacitor C 1, filter circuit that C2 formed, the input of its filter circuit be connected to power subsystem 11 by a fuse 121 first power input 111 to obtain the input power supply, the output of this bridge rectifier 122 is to be connected to voltage regulation unit 13 by a capacitor C 3.

This voltage regulation unit 13 is made up of with resistance R a 8～R10 and a transistor 131 two Zener diode ZD1, ZD2; Wherein the base stage of this transistor 131 is the outputs that are connected to bridge rectifier 122 by Zener diode ZD1, ZD2 that a resistance R 10 is connected with two, and the emitter-base bandgap grading of transistor 131 is to be connected to detect in the switch unit 14.

This detects switch unit 14 and mainly is made up of a bridge rectifier 141, optical coupler 142, a voltage comparator 143, a transistor 144 and 145,146 on two relays; Wherein the input of this bridge rectifier 141 is the inputs that connect step-down rectifier unit 12, bridge rectifier 141 outputs are to be connected to optical coupler 142 by resistance R 1, the gate of this voltage comparator 143 is the outputs that are connected to optical coupler 142 by a resistance R 4 and capacitor C 4 in addition, the anode of voltage comparator 143 is the base stages that are connected to transistor 144,144 coil places that are connected to two relays 145,146 with the collection utmost point respectively of transistor.

The action connection point common ends of two relays 145,146 is to be connected to power output end 113 respectively, it is often opened with normally closed contact and then is connected with first, second power input 111,112 respectively, selects to be connected to power output end by that group power input so can be switched by two relays 145,146.

Cooperate graphic exposure can find out detailed circuit of the present invention by above explanation, as for circuit analysis of the present invention as described below:

This step-down rectifier unit 12 is to obtain power supply by first power input 111 wherein with detecting switch unit 14, wherein step-down rectifier unit 12 is after carrying out filter rectification with wherein filter circuit and bridge rectifier 122, produce the working power of a direct current low-voltage, and deliver to voltage regulation unit 13, and carry out voltage stabilizing via two Zener diode ZD1, ZD2, when working power more than the rated voltage of Zener diode ZD1, ZD2, transistor 131 conductings, and detection switch unit 14 is given in power supply, if power supply is lower than below the rated voltage, then stop power supply.

This detection switch unit 14 is will be from the power rectifier step-down of first power input 111 after delivered to the gate of voltage comparator 143 by optical coupler 142 by bridge rectifier 141, judge the size of first power input, 111 current potentials by voltage comparator 143, high more as first power input, 111 power supply potentials, then the current potential of optical coupler 142 outputs is low more, voltage comparator 143 not conductings, and transistor 114 is because of base potential rising conducting, so make relay 145,146 coil excitation, its common joint will be cut to normal opened contact, and make first power input 111 be linked to power output end 113.

Otherwise, if first power input, 111 power supply potentials are low more, then the current potential of optical coupler 142 outputs is high more, voltage comparator 143 conductings, and transistor 114 reduces not conducting because of base potential, so make the coil excitation of relay 145,146, its common joint will be cut to normally closed contact, and make second source input 112 be linked to power output end 113.

From the above, the present invention really can reach automatic detection change in voltage and switch different power inputs, and avoiding may be because of voltage instability or power interruptions the time, the situation that may produce user's property loss takes place.

Comprehensive as can be known above-mentioned, the present invention has different intention and improvement for its power supply mode of existing power supply unit, and possesses obvious effect is arranged, and has practicality and progressive concurrently, and meets the condition of patent, so apply for patent of invention in accordance with the law.

Claims (1)

1, the power supply unit of a kind of tool two AC power supply parallel connection is characterized in that it includes:

One power subsystem is made up of two groups of ac power input ends and a power output end;

One step-down rectifier unit is to obtain power supply via a power input of power subsystem and produce the working power of a direct current low-voltage;

One voltage regulation unit is that the working power of step-down rectifier unit is carried out voltage stabilizing;

One detects switch unit, is to detect the input power supply potential and do switching at aforementioned two groups of ac power input ends and power output end to be connected;

This power subsystem is made up of power supply first input and second input and a power output end;

This step-down rectifier unit is that resistance and electric capacity and a bridge rectifier are formed; Wherein: the filter circuit that the input connection one of bridge rectifier is made up of resistance and electric capacity, the input of its filter circuit be connected to power subsystem by a fuse first power input to obtain the input power supply, the output of this bridge rectifier is to be connected to voltage regulation unit by an electric capacity;

This voltage regulation unit is made up of two Zener diodes and a resistance and a transistor; Wherein this transistorized base stage is the output that is connected to bridge rectifier by the Zener diode that a resistance is connected with two, and transistorized emitter-base bandgap grading is to be connected to detect in the switch unit;

This detection switch unit is made up of a bridge rectifier, optical coupler, a voltage comparator, a transistor AND gate two relays; Wherein the input of this bridge rectifier is the input that connects the step-down rectifier unit, the bridge rectifier output is to be connected to optical coupler by resistance, the gate of this voltage comparator is the output that is connected to optical coupler by resistance and electric capacity in addition, the anode of voltage comparator is to be connected to transistorized base stage, and transistor then is connected to the coil place of two relays respectively with the collection utmost point;

The action connection point common ends of two relays is to be connected to power output end respectively, and it is often opened with normally closed contact and then is connected with first, second power input respectively, selects to be connected to power output end by that group power input so can be switched by two relays.

Images