CN101931267B

CN101931267B - Control unit for realizing intelligent switching of alternating current input

Info

Publication number: CN101931267B
Application number: CN 200910148066
Authority: CN
Inventors: 史强; 池艾文; 刘潇
Original assignee: Beijing Dynamic Power Co Ltd
Current assignee: Beijing Dynamic Power Co Ltd
Priority date: 2009-06-24
Filing date: 2009-06-24
Publication date: 2013-01-23
Anticipated expiration: 2029-06-24
Also published as: CN101931267A

Abstract

The invention relates to a control unit for realizing intelligent switching of alternating current input. The control unit comprises two paths of alternating current input, a rectification module, an auxiliary power module, a contactor driving module, a system alternating current input detection module, a communication module, a sampling module and a central processor, wherein the sampling module samples the voltages of the two paths of alternating current input as well as the voltage of a direct current bus; and the central processor judges according to a sampled signal provided by the sampling module and sends driving signals with different duty ratios to control a contactor. The control unit can run in the full scale range (between 90 and 300 V) of a communication power supply system, realize intelligent switching between the two paths of alternating current and detect whether the contactor is pulled in successfully or not; under the condition that a mains supply is normal and the primary pull-in of the contactor is unsuccessful, repeated pull-in can be realized and switching reliability of the mains supply is ensured; and when the alternating current input fails, a system can find a failure point rapidly, so that failure detection time is shortened greatly.

Description

A kind of control unit of realizing exchanging the switching of input intelligence

Technical field

The present invention relates to the power-supply system distribution technique, relate in particular to a kind of control unit that input intelligence is switched of realizing exchanging.

Background technology

In emergency power supply and the power supply system for communications, in order to guarantee power supply reliability, often adopt the two-way AC-powered, as shown in Figure 1, the civil power 1 (220V that picks out from electrical network, the alternating current of 50HZ) is main power source, civil power 2 (from the 220V that electrical network picks out, the alternating current of 50HZ) is stand-by power supply, when civil power 1 is normal, contactor 1 adhesive, civil power 1 drawing-in system work; When civil power 1 breaks down, contactor 1 disconnects contactor 2 adhesives, civil power 2 drawing-in system work.The below introduces and realizes in a kind of prior art that the method that contactor switches is elaborated.Fig. 2 is the truth table of MC34161 chip, Fig. 3 is the drive circuit figure of relay, and as shown in the figure, DC1 is the direct voltage of three-phase alternating current after rectification, VH2-0 is another high direct voltage, when the two-way line voltage reached certain amplitude (such as 220V), DC1 made the V24 conducting, the adhesive of Q1 relay, 4 pin among the Q1 link to each other with 5 pin, 7 pin link to each other with 8 pin, and this moment, VH1 was high voltage, CON2 ground connection.Fig. 4 is the control circuit figure that contactor switches, can obtain according to truth table shown in Figure 2, when CON2 ground connection, the IN1 of N2 is low level, this moment, the OUT1 of N2 was output as low level, so IO2 is low level, A.C. contactor 2 not adhesives, because VH1 this moment is high voltage, the IN1 pin of N1 chip is high level again, the OUT1 that can obtain N1 according to truth table shown in Figure 2 is output as high level, so IO1 is high level, IO1 drives A.C. contactor 1 adhesive by R19, and this moment, civil power 1 entered system works, when 1 adhesive moment of A.C. contactor, as shown in Figure 5, capacitor C 3 voltage drops, this moment, the line bag of contactor 1 accessed VCC, realized the high pressure adhesive, the function (circuit diagram of contactor 2 is identical with the circuit diagram of contactor 1) that low pressure keeps.When civil power 1 broke down, DC1 gradually became zero, the V24 cut-off among Fig. 3, the V24 cut-off, relay Q1 normally opened contact disconnects, the normally-closed contact adhesive, 5 pin link to each other with 3 pin, 8 pin link to each other with 6 pin, so CON1 ground connection, VH2 is high voltage, from the foregoing, contactor 1 not adhesive this moment, contactor 2 adhesives, civil power 2 enters system works.

From the foregoing, adopt this kind method to realize the switching of contactor, only have when line voltage reaches certain amplitude, could drive contactor, can't satisfy the power supply system for communications (90V-300V) in the full scale working range, realize the requirement that the two-way alternating current switches, and employing the method, whether adhesive is successful also can't to detect contactor, can not guarantee to exchange the reliability of input, when civil power breaks down, also can't judge the fault origination point, and the civil power operating state is reported system controller.

Description of drawings

Fig. 1 is that two-way exchanges the input schematic diagram;

The truth table of Fig. 2 MC34161 chip;

The drive circuit figure of Fig. 3 relay;

The control circuit figure that Fig. 4 contactor switches;

The circuit diagram of Fig. 5 contactor 1;

Fig. 6 rectification module circuit diagram;

Fig. 7 accessory power supply module circuit diagram;

Two-way exchanges the sampling module circuit diagram of input in Fig. 8 sampling module;

The circuit diagram of sampling DC bus-bar voltage in Fig. 9 sampling module;

Figure 10 central processing unit circuit diagram;

Figure 11 PWM drive part circuit diagram;

Figure 12 contactor connecting circuit figure;

Figure 13 system exchanges input detection module circuit diagram;

Figure 14 communication module circuit diagram.

Specific embodiment

Below with reference to accompanying drawing the present invention is elaborated.

Fig. 6 is the rectification module circuit diagram, and as shown in the figure, XS 9 is first via civil power input interface, XS10 is the second road civil power input interface, and R1-R6 is piezo-resistance, V1-V13, V16 forms the Half bridge rectifier circuit, RV7 is piezo-resistance, and R39 is thermistor, and RV7 and R39 play antisurge and impulse current, C14, C15, C29, the energy in the circuit when C30 can store the high pressure adhesive.The two-way civil power produces high direct voltage VDC (VDC is exactly DC bus-bar voltage) through behind the rectification module rectifying and wave-filtering shown in Figure 6.Fig. 7 is the accessory power supply module circuit diagram, as shown in the figure, does not isolate between VDC and the VDD, that N6 adopts is LNK306, high voltage direct current VDC is converted into the direct current VDD about 12V, and VDD is converted into again VCC, and VCC can exchange input detection module and MCU power supply for system.Fig. 8 is the sampling module circuit diagram that two-way exchanges input in the sampling module, as shown in the figure, it is the U phase voltage with first via civil power, adopt operational amplifier to carry out the signal conversion, operational amplifier is single power supply, the U phase voltage of first via civil power is converted into the less sinusoidal signal VAC-1U of DC component, and VAC-1U is directly introduced the AD pin of MCU and is sampled.The V of the 1 road civil power, W mutually electricity and U, the V of the second road civil power, W mutually electricity all be to carry out the signal conversion by same circuit, and directly introduce the AD pin of MCU.Fig. 9 is the circuit diagram of sampling DC bus-bar voltage in the sampling module, sampling obtains voltage DC to DC bus-bar voltage VDC through electric resistance partial pressure as shown in the figure, DC is directly accessed the sampled voltage of MCU as DC bus-bar voltage, Figure 10 is the central processing unit circuit diagram, as shown in the figure, built-in 8 road AD ALT-CH alternate channels of this MCU, can detect the effective value of two-way civil power (6 phase) and the sample voltage value of dc bus, MCU judges according to the effective value of the every phase voltage of two-way civil power and the sample voltage value of dc bus, pwm pulse signal in TRIGGERA and TRIGGERB two pins output distinct pulse widths, come adhesive and the maintenance of control contactor 1 and contactor 2, realize the switching between civil power 1 and the civil power 2, system default is for when the two-way civil power all works, choose civil power 1 and enter system works, this moment, MCU can send pulse signal than wide pulse width at the TRIGGERA pin, TRIGGERB holds pulse-free signal, in Figure 11 PWM drive part circuit diagram, this pulse signal produces the pulse signal of a driven MOS pipe V21 through the level conversion function of N11, V21 pipe conducting this moment, be powered between 4 pin of binding post XS4 and 3 pin, as can be seen from Figure 12, this moment, the line bag of contactor 1 also was powered, contactor 1 adhesive, civil power 1 enters system works, Figure 13 is that system exchanges input detection module circuit diagram, the ACOUT end links to each other with the 9 pin PD5 of MCU, when not exchanging input, the ACOUT end is because linking to each other with VCC, be in high level, electric main is introduced into after contactor adhesive success, after the AC signal process V115 rectification, flow into photoelectrical coupler N7, this moment, ACOUT linked to each other with GND, ACOUT is in low level, MCU can just judge contactor according to the level of ACOUT, and whether adhesive is successful, when ACOUT is positioned at low level, contactor adhesive success, this moment, MCU can go out at the TRIGGERA human hair combing waste pulse signal of narrower pulsewidth, make contactor 1 continue to keep attracting state, thereby realize the high pressure adhesive, the function that low pressure keeps.If detecting ACOUT, MCU still is in high level, show that contactor 1 does not have the adhesive success, civil power 1 does not enter system, this moment, the TRIGGERA pin of MCU can continue to send several times pulse signal than wide pulse width again, drive contactor 1 adhesive, until bring out existing low level at ACOUT, show contactor 1 adhesive success after, send again the pulse signal of narrower pulsewidth at the TRIGGERA pin, keep in touch device 1 adhesive.When MCU judges that civil power 1 goes wrong, can send pulse signal than wide pulse width at the TRIGGERB pin, TRIGGERA pin pulse-free signal, contactor 1 disconnection this moment, in Figure 11 PWM drive part circuit diagram, this pulse signal produces the pulse signal of a driven MOS pipe V22 through the level conversion function of N12, V22 pipe conducting this moment, 1 pin of binding post XS4 is powered, as can be seen from Figure 12, this moment, the line bag of contactor 2 also was powered, contactor 2 adhesives, civil power 2 enters system works, MCU this moment is according to the whether adhesive success of the electrical level judging contactor 2 of ACOUT, when ACOUT is low level, contactor 2 adhesives success, MCU can go out the narrower pulse signal of pulsewidth at the TRIGGERB human hair combing waste, make contactor 2 continue to keep adhesive, when ACOUT is high level, contactor 2 adhesives failures, MCU can continue to send several times pulse signal than wide pulse width again at the TRIGGERB pin, drive contactor 2 adhesives, until ACOUT end is when becoming low level, MCU can send the pulse signal of narrower pulsewidth at the TRIGGERB pin, makes contactor 2 keep adhesives.When civil power 1 and civil power 2 all broke down, MCU can not send pulse signal at TRIGGERA and TRIGGERB pin, and contactor 1 and contactor 2 are failure to actuate, and civil power 1 and civil power 2 are not introduced into system.Figure 14 is the communication module circuit diagram, and splicing ear XS1 links to each other with the RS485 bus, by the TXD that links to each other with MCU and RXD the relevant information of the two-way civil power in the MCU is reported system, and when the two-way civil power broke down, system can find the fault origination point very soon.

In addition, the present invention comes control contactor work according to city's electricity condition, and in certain line voltage scope, the reliable adhesive of contactor keeps, and has stipulated the voltage back diffirence value that municipal power failure is judged, prevents owing to the reasons such as power network fluctuation cause the control unit misoperation.

From the above, the present invention adopts do not isolate digital control, directly utilize the AD effective value sampling of MCU, precision is high, can work in power supply system for communications full range (90V-300V), the intelligence that realizes the two-way alternating current is switched, and whether adhesive is successful can to detect contactor, normal at civil power, in unsuccessful situation of adhesive of contactor, can realize repeating adhesive, guarantee the reliability that civil power switches, meanwhile, the present invention also exchanges the operating state real-time report of input to system by the RS485 communication line with two-way, when exchanging input generation problem, system can find the fault origination point very soon, has greatly shortened the time of fault detect.

Claims

1. realize exchanging the control unit that input intelligence is switched for one kind, comprising: two-way exchanges input, rectification module, and the accessory power supply module, the contactor driver module, system exchanges the input detection module, and communication module characterized by further comprising:

Sampling module exchanges input to two-way and carries out voltage sample, simultaneously DC bus-bar voltage is sampled;

Central processing unit is judged according to the sampled signal that sampling module provides, and the driving signal that sends different duty comes control contactor;

Described sampling module comprises:

Two-way exchanges the input sample module, and the every cross streams input voltage that two-way is exchanged input carries out the signal conversion, obtains the less sinusoidal signal of DC component, this sinusoidal signal access central processing unit;

With the DC bus-bar voltage sampling module, adopt the method for electric resistance partial pressure to obtain the sampled signal of DC bus-bar voltage to DC bus-bar voltage, this sampled signal accesses described central processing unit;

Described contactor driver module comprises the first contactor and the second contactor, the driving signalizing activity that described the first contactor and described the second contactor send according to described central processing unit, and the control two-way exchanges the switching of input;

The sampled signal that described central processing unit provides according to described sampling module, judge that two-way exchanges the operating state of input, when first via interchange input service is normal, described central processing unit sends described the first contactor adhesive of the larger drive of duty ratio at the TRIGGERA end, the TRIGGERB end does not drive signal simultaneously, described the second not adhesive of contactor, the first via exchanges input and is introduced into system;

When first via interchange input is broken down, described central processing unit sends described the second contactor adhesive of the larger drive of duty ratio at the TRIGGERB end, the TRIGGERA end does not drive signal simultaneously, the first not adhesive of contactor, and the second the tunnel exchanges input is introduced into system;

When the first via exchanged input and exchanges input with the second the tunnel and all break down, all without the driving signal, not drawing-in system was inputted all in the two-way interchange to described central processing unit at TRIGGERA end and TRIGGERB end.

2. control unit as claimed in claim 1 is characterized in that:

Described rectification module exchanges input to two-way and carries out rectifying and wave-filtering, and obtains DC bus-bar voltage.

3. control unit as claimed in claim 1 is characterized in that:

Described accessory power supply module is converted into DC low-voltage with DC bus-bar voltage, power supply is provided for described sampling module and described central processing unit, and this power supply and described DC bus-bar voltage are not isolated.

4. control unit as claimed in claim 1 is characterized in that:

Described system exchanges the input detection module and links to each other with the main output contact of described the first contactor and described the second contactor, and whether adhesive is successful to detect described the first contactor or described the second contactor, and notifies described central processing unit.

5. control unit as claimed in claim 1 is characterized in that:

The signal that described central processing unit sends according to described system interchange input detection module is judged described the first contactor or described the second contactor, and whether adhesive is successful, when described the first contactor or described the second contactor adhesive failure and corresponding interchange input service are normal, described central processing unit can send the larger driving signal of described duty ratio again, drives described the first contactor or described the second contact adhesive; After described the first contactor or described the second contactor adhesive success, described central processing unit sends the smaller driving signal of duty and keeps described the first contactor or described the second contact to continue adhesive.

6. control unit as claimed in claim 1, it is characterized in that: the two-way that described communication module gathers described central processing unit exchanges the information reporting of input to system.