CN203522315U - Fast Dual Power Transfer Switching Device - Google Patents

Abstract

The utility model provides a quick double-power-supply switch device. The utility model relates to a switch which is used for ensuring power supply continuity. The quick double-power-supply switch device can effectively settle the problems of contact arc starting, electric energy loss, etc. in a traditional switch. The quick double-power-supply switch device comprises a common power supply, a standby power supply, a load, a first circuit breaker and a second circuit breaker. The quick double-power-supply switch device further comprises a first switch unit, a second switch unit, a data acquiring module and a master control module. The first switch unit or the second switch unit comprises the following components: a first total-control type switching device insulated gate bipolar transistor, a second total-control switching device insulated gate bipolar transistor, a first uncontrollable semiconductor device diode, a second uncontrollable semiconductor device diode, a first buffer circuit, a second buffer circuit, a first driving circuit and a second driving circuit. The quick double-power-supply switch device reduces severe effect to load caused by problems of temporary voltage reduction of power supply, short-time voltage interruption, etc., and ensures safe and stable operation of the power supply system. Power switching time of the quick double-power-supply switch device is within several milliseconds, and no-stoppage switching can be realized. Ideal speed and ideal transient characteristic are realized. The quick double-power-supply switch device truly satisfies harsh requirements of the sensible and key loads to power supply reliability and electric energy quality.

Description

Fast Dual Power Transfer Switching Device

technical field

The utility model relates to a fast dual power supply switching switch for ensuring the continuity of power supply.

Background technique

In the current power supply system, the power supply network sometimes has problems such as large-scale impact or nonlinear load switching, lightning strikes, load failures, etc., resulting in a sag in the power supply voltage or short-term power supply interruptions, which will lead to problems such as computer Some equipment of servers and data processors that are not allowed to be powered off has power supply termination, which will bring serious consequences to a large number of continuous production industries, financial centers, data centers, hospitals, transportation and other systems, resulting in immeasurable economic losses losses and even casualties. In view of this, industries with special requirements for power supply are often equipped with backup power supply.

In the case of a backup power supply, in order to achieve uninterrupted power supply, the traditional method is to use a mechanical switch or a solid-state switch based on a semi-controlled device to switch the load from the faulty line segment to the non-faulty bus. The inherent characteristics of this kind of electromechanical switch make the switching speed and transient characteristics not very ideal, and it is impossible to achieve "seamless" switching. Contact erosion, electromagnetic interference and power loss caused by arc phenomenon not only limit its application range, but also make its electrical life lower than its mechanical life, and the solid-state switch based on semi-controlled devices is uncontrollable, and the switching time is therefore extend.

The on-off time of fully-controlled semiconductor devices represented by insulated gate bipolar transistors can reach the microsecond level, which is easier to control than half-controlled devices, and does not generate arcs during switching. Therefore, the use of power electronic switches based on full-control semiconductor devices to replace or transform traditional mechanical switches will effectively solve the inherent problems of traditional mechanical switches, greatly improve the switching speed and service life of switches, and meet the requirements of sensitive and critical loads on power supply reliability. and stringent requirements for power quality.

Utility model content

The utility model provides a fast dual power switching switch device, which can effectively solve the inherent problems of traditional mechanical switches such as contact arcing and power loss, as well as the uncontrollable problem of semi-controlled switches, and greatly improve the switching speed and the service life of the switch. , to meet the stringent requirements of sensitive and critical loads for power supply reliability and power quality.

The technical scheme of the utility model is: including a common power supply, a backup power supply, a load, a circuit breaker and a circuit breaker two; Between the backup power supply and the load;

It also includes switch unit 1, switch unit 2, data acquisition module and general control module;

The switch unit is connected in parallel with the circuit breaker;

The switch unit 2 is connected in parallel with the circuit breaker 2;

The normal power supply, backup power supply and load are respectively connected to the input end of the data acquisition module, and the data acquisition module also has a communication connection with the general control module;

The control signal output terminal of the master control module is connected with the switch unit 1 and the switch unit 2.

The structure of the switch unit one or the switch unit two is:

Including fully-controlled switching devices IGBT 1 and 2, uncontrollable semiconductor device diodes 1 and 2, buffer circuits 1 and 2, and drive circuits 1 and 2;

The diode 1 and the IGBT 1 are connected in reverse parallel, and then connected in parallel with the buffer circuit 1; the drive circuit 1 is connected to the G pole of the IGBT 1 to form an interface with the anode direction of the diode 1 A. The direction of the negative pole is the sub-circuit 1 of the connection point 1;

The diode 2 and the insulated gate bipolar transistor 2 are connected in reverse parallel, and then connected in parallel with the buffer circuit 2; the drive circuit 2 is connected to the G pole of the insulated gate bipolar transistor 2, and the anode constitutes an interface with the direction of the diode 2 B. The direction of the negative pole is the sub-circuit 2 of the connection point 2; the connection point 1 is connected to the connection point 2;

The driving circuit 1 and the driving circuit 2 are respectively connected to the control signal output terminals of the master control module.

It also includes a human-computer interaction module. The human-computer interaction module communicates with the main control module through the serial port, and displays the effective value of voltage and current of each channel in real time. stop control.

The utility model uses an insulated gate bipolar transistor to replace or transform a traditional mechanical switch or a half-controlled switch device. The insulated gate bipolar transistor used in the switch unit body of the utility model is a fully-controlled power electronic device, and the on-off of the device can be controlled. No matter whether the current passing through the switch crosses zero, it can be controlled in real time to turn off, which will The switching speed is greatly improved; and there will be no arcing phenomenon caused by the on-off of the mechanical switch, the generation of circulating current is suppressed, and the service life of the switch is extended. Coupled with the precise control system, the switching time between the dual power supplies can be controlled within In milliseconds, it can almost realize "seamless" switching between dual power supplies, meet the stringent requirements of sensitive and critical loads on power supply reliability and power quality, and greatly reduce the impact of power supply voltage sags and short-term voltage interruptions. The serious impact caused by the load ensures the safe and stable operation of the power supply system. The power supply switching time of the utility model reaches millisecond level, can realize seamless switching, has ideal fastness and transient characteristics, and effectively meets the strict requirements of sensitive and key loads on power supply reliability and power quality.

Description of drawings

Fig. 1 is a structural representation of the utility model,

Fig. 2 is the structural principle diagram of switch unit in the utility model;

In the figure, 10 is interface A, 11 is IGBT 1, 12 is diode 1, 13 is connection point 1,

20 is interface B, 21 is IGBT 2, 22 is diode 2, and 23 is connection point 2.

Detailed ways

The utility model is shown in Figures 1 and 2: it includes a common power supply LA, a backup power supply LB, a load L, a circuit breaker PS1 and a circuit breaker PS2; the circuit breaker PS1 is located between the common power supply LA and the load L Between, the circuit breaker PA2 is set between the backup power supply LB and the load L;

It also includes switch unit 1, switch unit 2, data acquisition module and general control module;

The switch unit one is connected in parallel with the circuit breaker one PS1;

The switch unit 2 is connected in parallel with the circuit breaker 2 PS2;

The common power supply LA, the backup power supply LB, and the load L are respectively connected to the input terminals of the data acquisition module, and the data acquisition module also has a communication connection with the total control module;

The control signal output end of the master control module is connected with the control poles of the switch unit 1 and the switch unit 2. The control signal output by the master control module is sent to the drive circuit, and the drive circuit generates a corresponding drive signal to control the switch unit. Since the switching on and off of the following transistors in the switch unit belongs to the conventional technology in the art, it will not be repeated here.

The structure of the switch unit one or the switch unit two is:

Including fully-controlled switching devices IGBTs 11 and 221, uncontrollable semiconductor device diodes 12 and 22, buffer circuits 1 and 2, and drive circuits 1 and 2;

The diode one 12 and the IGBT one 11 are connected in reverse parallel, and then connected in parallel with the buffer circuit one; the drive circuit one is connected to the G pole of the insulated gate bipolar transistor one 11 to form a diode one 12 The positive direction is the interface A10, and the negative direction is the sub-circuit 1 of the connection point 13;

The diode 22 and the IGBT 21 are connected in reverse parallel, and then connected in parallel with the buffer circuit 2; the drive circuit 2 is connected to the G pole of the IGBT 21, and the anode is composed of a diode 2 The direction of 22 is the interface B20, and the direction of the negative pole is the sub-circuit 2 of the connection point 2 23; the connection point 13 is connected to the connection point 2 23;

The driving circuit 1 and the driving circuit 2 are respectively connected to the control signal output terminals of the master control module. In this way, after receiving the relevant signal from the master control module, the opening and closing actions can be performed. What needs to be explained here is: the term "module" borrowed in the utility model refers to the corresponding circuit.

It also includes a human-computer interaction module. The human-computer interaction module communicates with the main control module through the serial port, and displays the effective value of voltage and current of each channel in real time. stop control. It can display the voltage and current of common and standby power sources; it can also complete the mode selection: manual mode or automatic mode.

Working method of the present utility model, carry out according to the following steps:

1) When both the normal power supply LA and the standby power supply LB are working normally, the circuit breaker one PS1 is closed, and the circuit breaker two PS2 is open; both the switch unit one and the switch unit two remain in the standby state, and the circuit breaker one PS1 remains normal work, and continue to maintain the power supply of the common power supply LA to the load L;

2) When the voltage sag or instantaneous interruption occurs on the common power supply side LA, the master control module sends the following work instructions to the switch unit 1 and the circuit breaker 1 PS1 according to the information of the data acquisition module:

2.1), trigger the start switch unit one, turn off the circuit breaker one PS1;

2.2) When the master control module judges that the circuit breaker PS1 has been disconnected, and the current on the LA side of the common power supply is zero or less than its threshold value, and at the same time ensure that the residual voltage on the load L bus is also reduced to zero,

or the potential difference between the standby power source LB and the load L bus is zero,

Immediately trigger the switch unit 2, and the backup power supply LB supplies power to the load L, and trigger the circuit breaker 2 PS2 after the power supply is stable;

2.3) Due to the low impedance of the mechanical switch, the current will be transferred to the mechanical switch side again. After the commutation is completed, the switch unit 2 is turned off, and the backup power supply LB supplies power to the load L through the circuit breaker 2 PS2. the

When it is detected that the normal power supply returns to normal for a period of time, the main control module will output a corresponding control signal to turn off the switch unit 2 on the standby power supply side. power supply to the load. The specific method is contrary to the foregoing, and will not be repeated here.

Further illustrate the working principle of the present utility model below:

When the utility model is working, when the dual power supply system is normal, in order to reduce the on-state loss of the switch tube, the common power supply LA supplies power to the load L through the circuit breaker PS1. When initially supplying power to the load, the circuit breaker PS1 and switch unit 1 on the common power supply side should be triggered at the same time. Since the switch unit (the switch unit controls the N line) uses an insulated gate bipolar type device, so the on-off of the switch unit is instantaneous, so that the voltage across the circuit breaker PS1 is clamped to a very low level, so the arcing phenomenon will not occur during the conduction process of the circuit breaker PS1, and the main control board receives the After the feedback signal of circuit breaker one PS1, switch unit one is turned off immediately, and then the primary power supply (commonly used power supply LA), circuit breaker one and the load form a path. The data acquisition module detects the voltage and current values of each channel in real time, and transmits them to the general control module, and the general control module sends the detected values to the human-computer interaction module for display through serial port communication;

When the master control module judges that the voltage sag or instantaneous interruption occurs on the LA side of the common power supply, the control port of the master control module outputs a control signal, triggers the switch unit one, and turns off the circuit breaker one PS1, and the arcing phenomenon does not occur during this process. The current is transferred from circuit breaker one PS1 to switch unit one, and then the master control module will control switch unit one to disconnect. When the master control module judges that the feedback signal of the circuit breaker PS1 is disconnected, and the current of the main power supply LA side is zero or less than its threshold value, at the same time, it is ensured that the residual voltage on the load L bus is also reduced to zero or the backup power supply LB and the load The potential difference between L busbars is zero, trigger switch unit 2 immediately, and the backup power supply LB supplies power to the load. After the power supply is stable, circuit breaker 2 PS2 is triggered. Due to the low impedance of the mechanical switch, the current will be transferred to the mechanical switch side again. After the flow is completed, the switch unit 2 is turned off, and the backup power supply LB supplies power to the load through the circuit breaker 2 PS2, and arcing phenomenon will not occur during this process; thus, the "seamless" switching between the dual power supplies is realized to meet the requirements of sensitive loads on power quality. stringent requirements.

When both power supplies fail or overcurrent, short circuit or circulating current occurs on the load side, the general control module will immediately turn off the switching units and circuit breakers on the dual power supply side to stop supplying power to the load.

When the utility model judges that the power supply has a voltage sag or interruption fault, it will output a corresponding trigger signal to control the on-off of the switch unit and the circuit breaker on both sides of the normal and standby power supply to achieve fast (millisecond level) switching purpose of power. That is, when a failure occurs on the common side, switch unit 1 is used to turn off the "transition"; when the backup power side is activated synchronously, switch unit 2 on this side is used to connect "transition", which avoids the need for circuit breakers while achieving the purpose of fast switching. 1. The hard shutdown and connection of circuit breaker 2 lead to arcing and other disadvantages. the

Claims (3)

1. quick double power supply converting switch device, comprises conventional power supply, stand-by power supply, load, circuit breaker one and circuit breaker two; Described circuit breaker one is located between described conventional power supply and load, and described circuit breaker two is located between described stand-by power supply and load;

It is characterized in that, also comprise switch element one, switch element two, data acquisition module and total control module;

Described switch element one is connected in parallel with described circuit breaker one;

Described switch element two is connected in parallel with described circuit breaker two;

Described conventional power supply, stand-by power supply, load are connected with the input of data acquisition module respectively, and data acquisition module also has communication with total control module and is connected;

The control signal output of top control module is connected with switch element two with described switch element one.

2. quick double power supply converting switch device according to claim 1, is characterized in that, the structure of described switch element one or switch element two is:

Comprise full-controlled switch device isolation grid bipolar transistor one, two, uncontrollable semiconductor device diode one, two, buffer circuit one, two, and drive circuit one, two;

Described diode one and insulated gate bipolar transistor one reverse parallel connection, again and connect buffer circuit one; Described drive circuit one connects the G utmost point of described insulated gate bipolar transistor one, forms to take the electronic circuit one that the positive extreme direction of diode one is tie point one as interface A, negative pole direction;

Described diode two and insulated gate bipolar transistor two reverse parallel connections, again and connect buffer circuit two; Described drive circuit two connects the G utmost point of described insulated gate bipolar transistor two, anodal form take the electronic circuit two that diode two directions are tie point two as interface B, negative pole direction; Described tie point one is connected with tie point two;

Described drive circuit one and drive circuit two are connected respectively the control signal output of described top control module.

3. quick double power supply converting switch device according to claim 1 and 2, it is characterized in that, also comprise human-computer interaction module, described human-computer interaction module communicates by serial ports and total control module, show in real time the effective value on each road, by human-computer interaction module, switch element one or switch element two are carried out the control of parameter setting and start and stop.

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