CN103856067A - Frequency converter and synchronous working frequency conversion switching control system and method - Google Patents

Frequency converter and synchronous working frequency conversion switching control system and method Download PDF

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CN103856067A
CN103856067A CN201410126210.5A CN201410126210A CN103856067A CN 103856067 A CN103856067 A CN 103856067A CN 201410126210 A CN201410126210 A CN 201410126210A CN 103856067 A CN103856067 A CN 103856067A
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China
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phase
voltage
input
load
active link
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CN201410126210.5A
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Chinese (zh)
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CN103856067B (en
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刘仁专
徐铁柱
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深圳市英威腾电气股份有限公司
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Abstract

The embodiment of the invention discloses a frequency converter and a synchronous working frequency conversion switching control system and a synchronous working frequency conversion switching control method, which are used for guaranteeing the synchronization of a voltage phase of a load input terminal and the voltage phase of a commercial power so as to reduce the impact to the load and the frequency converter during the switching of the working frequency conversion to improve the system stability. The frequency converter disclosed by the embodiment of the invention comprises a voltage detection circuit, a lock phase control module and a backbone circuit, wherein the voltage detection circuit is connected with the lock phase control module; an inversion input terminal is arranged on the backbone circuit; the voltage detection circuit comprises a commercial power detection circuit and a load detection circuit, wherein the input terminal of the commercial power detection circuit is connected with a voltage output terminal of the commercial power so as to detect the voltage of the commercial power; the input terminal of the load detection circuit is connected with a load voltage input terminal so as to detect the voltage of the load voltage input terminal; the voltage phase of the load voltage input terminal is consistent with the voltage phase of the commercial power by controlling the voltage phase of the inversion input terminal via the lock phase control module when the voltage phase of the load voltage input terminal is inconsistent with the voltage phase of the commercial power.

Description

A kind of frequency converter, work frequency variable synchronous handover control system and method
Technical field
The present invention relates to Electromechanical Control field, be specifically related to a kind of frequency converter, work frequency variable synchronous handover control system and method.
Background technology
Tradition is mainly used in mains-supplied and frequency converter inversion output to do with the frequency converter of phase-locked function phase-locked, realizes the switching of power frequency and frequency conversion.Produce the equipment of phase shift if increase transformer or filter etc. between the inversion output of frequency converter and load, inverter voltage can make original inverter output voltage phase place produce phase shift after the equipment such as transformer or filter, cause inverter output voltage and load input terminal voltage to have phase difference, frequency converter in work frequency conversion switching moment tradition with phase-locked function cannot detect this phase difference, larger to load shock and damage, can make system occur job insecurity or the phenomenon such as undesired; In addition, because the frequency converter of tradition with phase-locked function is large to load shock, damage is large, switched voltage falls, not steady, conventionally require large several times of the power ratio load of frequency converter, cause like this high expensive; For in the time that power frequency is switched to the exigent load of Phase synchronization, as lighting load (sodium vapor lamp, Halogen lamp LED or neon lamp etc.), in the time that power frequency changes frequently, if phase place is asynchronous, lighting load will be extinguished, and the start-up time of lighting load is very long, can have a strong impact on like this it and normally use.
Summary of the invention
The embodiment of the present invention provides a kind of frequency converter, work frequency variable synchronous handover control system and method, realizing mains-supplied synchronizes with load input terminal voltage, voltage falls and compensates when switching between power frequency and frequency conversion, can guarantee the stability of system, reliability.
The embodiment of the present invention provides a kind of frequency converter on the one hand, can comprise: voltage detecting circuit, phase-locked control module and trunk circuit, and described voltage detecting circuit is connected with described phase-locked control module, on described trunk circuit, is provided with inverting output terminal;
Wherein, described voltage detecting circuit comprises city's power detection circuit and load detecting circuit, the input of described city power detection circuit is connected to detect line voltage with the voltage output end of civil power, and the input of described load detecting circuit is connected to detect load input terminal voltage with load voltage input;
Described phase-locked control module is connected with the output of described city power detection circuit and the output of load detecting circuit respectively, and described city power detection circuit, load detecting circuit, phase-locked control module and load voltage input form closed loop phase lock circuitry;
When described load input terminal voltage-phase and described line voltage phase place are when inconsistent, described phase-locked control module, by controlling the voltage-phase of described inverting output terminal, makes described load input terminal voltage-phase consistent with described line voltage phase place.
Further, above-mentioned phase-locked control module comprises sampling module and analysis module;
Described sampling module is connected with the output of described city power detection circuit and obtains the line voltage that described city power detection circuit detects;
Described sampling module is also connected with the output of described load detecting circuit and obtains the load input terminal voltage that described load detecting circuit obtains;
Described analysis module is connected with described sampling module, analyze contrast by line voltage phase place and load input terminal voltage-phase that described sampling module is obtained, when described load input terminal voltage-phase and described line voltage phase place are when inconsistent, control the voltage-phase of described inverting output terminal, make described load input terminal voltage-phase and described line voltage phase place consistent.
Further, above-mentioned city power detection circuit comprises the first active link, the second active link, the 3rd active link and the first negative circuit, the first input end of described the first active link is connected with the R in civil power three-phase voltage RST, described the second active link input is connected with the S in described civil power three-phase voltage RST, the first input end of described the 3rd active link is connected with the T in described civil power three-phase voltage RST, and the output of described the second active link is connected with the second input of described the 3rd active link with the second input of described the first active link;
Described the first active link obtains the magnitude of voltage V of RS in described civil power three-phase voltage RST sR, the output of described the first active link is connected with the input of described the first negative circuit; Described the first negative circuit is by magnitude of voltage V sRbe transformed into magnitude of voltage V rS, the output of described the first negative circuit is connected with the sampling module of described phase-locked control module;
Described the 3rd active link obtains the magnitude of voltage V of ST in described civil power three-phase voltage RST sT, described the 3rd output of active link and the sampling module of described phase-locked control module are connected.
Further, above-mentioned the first active link comprises the first resistance R 1, the 5th resistance R 5 and the 7th resistance R 7 of series connection, and one end of described the first resistance R 1 is the first input end of described the first active link, is connected with the R in described civil power three-phase voltage RST; After described the 5th resistance R 5 is in parallel with the first capacitor C 1, be connected between the inverting input and output of the first amplifier U1, the inverting input of described the first amplifier U1 is connected with described the first clamp diode D1; The in-phase input end of described the first amplifier U1 is the second input of the first active link, and the output of described the first amplifier U1 is the output of the first active link;
Described the second active link comprises the second resistance R 2, the second clamp diode D2, the 4th resistance R 4 and the second capacitor C 2; One end of described the second resistance R 2 is the input of described the second active link, is connected with the S in described civil power three-phase voltage RST; The other end of described the second resistance R 2 is ground connection after described the 4th resistance R 4 of parallel connection and the second capacitor C 2; The other end of described the second resistance R 2 is connected with the second clamp diode D2; The other end of described the second resistance R 2 is the output of the second active link;
Described the 3rd active link comprises the 3rd resistance R 3, the 6th resistance R 6, the second amplifier U2, the 3rd capacitor C 3 and the 3rd clamp diode D3; One end of described the 3rd resistance R 3 is the input of the second active link, is connected with the T in described civil power three-phase voltage RST; The other end of described the 3rd resistance R 3 is connected with the inverting input of described the second amplifier U2, is connected with respectively described the 6th resistance R 6 and three capacitor C 3 between the inverting input of described the second amplifier U2 and output; The inverting input of described the second amplifier U2 is connected with described the 3rd clamp diode D3; The in-phase input end of described the second amplifier U2 is the second input of the 3rd active link, and the output of described the second amplifier U2 is the output of described the 3rd active link;
Described the first negative circuit comprises the 8th resistance R 8, the 9th resistance R 9 and the 3rd amplifier U3; The inverting input of described the 3rd amplifier U3 is the input of described the first negative circuit, and described the 3rd output of amplifier U3 and the sampling module of described phase-locked control module are connected; Described the 8th resistance R 8 is connected between the inverting input and output of described the 3rd amplifier U3; The in-phase input end of described the 3rd amplifier U3 is through the 9th resistance R 9 ground connection.
Further, above-mentioned load detecting circuit comprises the 4th active link, the 5th active link, the 6th active link and the second negative circuit, the first input end of described the 4th active link is connected with the U in load three-phase voltage U VW, the input of described the 5th active link is connected with the V in described load three-phase voltage U VW, the first input end of described the 6th active link is connected with the W in described load three-phase voltage U VW, the output of described the 5th active link is connected with the second input of described the 6th active link with the second input of described the 4th active link,
Described the 4th active link obtains the magnitude of voltage V of UV in described load three-phase voltage U VW vU, the output of described the 4th active link is connected with the input of described the second negative circuit, and the input of described the second negative circuit is by magnitude of voltage V vUbe transformed into magnitude of voltage V uV, the output of described the second negative circuit is connected with the sampling module of described phase-locked control module;
Described the 6th active link obtains the magnitude of voltage V of VW in described load three-phase voltage U VW vW, described the 6th output of active link and the sampling module of described phase-locked control module are connected.
Further, above-mentioned the 4th active link comprises the tenth resistance R the 10, the 13 resistance R the 13 and the 16 resistance R 16 of series connection; One end of described the tenth resistance R 10 is the first input end of described the 4th active link, is connected with the U in described load three-phase voltage U VW; After described the 13 resistance R 13 is in parallel with the 4th capacitor C 4, be connected between the inverting input and output of the 4th amplifier U4, the inverting input of described the 4th amplifier U4 is connected with the 4th clamp diode D4; The in-phase input end of described the 4th amplifier U4 is the second input of described the 4th active link, and the output of described the 4th amplifier U4 is the output of the 4th active link;
Described the 5th active link comprises the 11 resistance R 11, the 5th clamp diode D5, the 14 resistance R 14 and the 5th capacitor C 5; One end of described the 11 resistance R 11 is the input of described the 5th active link, is connected with the V in described load three-phase voltage U VW; Ground connection after described the 14 resistance R 14 of the other end of described the 11 resistance R 11 through being connected in parallel and the 5th capacitor C 5; The other end of described the 11 resistance R 11 is connected with described the 5th clamp diode D5; The other end of described the 11 resistance R 11 is the output of the 5th active link;
Described the 6th active link comprises the 12 resistance R the 12, the 15 resistance R 15, the 5th amplifier U5, the 6th capacitor C 6 and the 6th clamp diode D6; One end of described the 12 resistance R 12 is the input of described the 6th active link, is connected with the W in described load three-phase voltage U VW; The other end of described the 12 resistance R 12 is connected with the inverting input of described the 5th amplifier U5, is connected with respectively described the 15 resistance R 15 and the 6th capacitor C 6 between the inverting input of described the 5th amplifier U5 and output; The inverting input of described the 5th amplifier U5 is connected with the 6th clamp diode D6; The in-phase input end of described the 5th amplifier U5 is the second input of described the 6th active link, and the output of described the 5th amplifier U5 is the output of described the 6th active link;
Described the second negative circuit comprises the 17 resistance R the 17, the 18 resistance R 18 and the 6th amplifier U6; The inverting input of described the 6th amplifier U6 is the input of described the second negative circuit, and described the 6th output of amplifier U6 and the sampling module of described phase-locked control module are connected; Described the 17 resistance R 17 is connected between the inverting input and output of described the 6th amplifier U6, and the in-phase input end of described the 6th amplifier U6 is through the 18 resistance R 18 ground connection.
Second aspect present invention also provides a kind of work frequency conversion handover control system, can comprise: the frequency converter that handover module, load and control module and above-mentioned first aspect provide, described load is connected with civil power and described frequency converter respectively after described handover module, described control module is connected with described handover module with described frequency converter respectively, described control module receives the lockin signal that described frequency converter sends,, control described handover module described load is switched on civil power or described frequency converter mutually successfully in situation at described lockin signal indicating lock.
In a preferred embodiment, between described load input terminal and described frequency converter inverting output terminal, be connected with the equipment that produces phase shift.
In a preferred embodiment, described frequency converter is connected with DC power supply, and described DC power supply is charged during at power frequency state at loaded work piece, after described civil power power down for described frequency converter provides working power;
When civil power is normal, described handover module control load connects civil power; When described city electrical anomaly, described handover module control load connects frequency converter.
A kind of method of the work frequency conversion handover control system providing based on above-mentioned second aspect is also provided third aspect present invention, can comprise:
Frequency converter obtains line voltage and load input terminal voltage;
Described frequency converter judges that whether described load input terminal voltage-phase is consistent with described line voltage phase place;
If described load input terminal voltage-phase and described line voltage phase place are inconsistent, described Frequency Converter Control inverting output terminal voltage-phase, to make described load input terminal voltage-phase consistent with described line voltage phase place, and export lockin signal and so that described control module according to described lockin signal, is controlled described handover module, described load is switched on described frequency converter or civil power.
In a preferred embodiment, in the time that described civil power is normal, load connects civil power described in described handover module control; In the time of described city electrical anomaly, load connects described frequency converter described in described handover module control.
As can be seen from the above technical solutions, a kind of frequency converter, work frequency variable synchronous handover control system and method that the embodiment of the present invention provides have the following advantages: can detect in real time line voltage and load input terminal voltage, proof load input terminal voltage and line voltage Phase synchronization, reduce the impact of phase difference to load and frequency converter in the time that work frequency conversion is switched; Meanwhile, by real-time relatively line voltage and load input terminal voltage, can carry out voltage in work frequency conversion switching moment and fall compensation, guarantee that system can keep continuing, stablize in work frequency conversion switching moment.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, to the accompanying drawing of required use in the embodiment of the present invention be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The frequency changer schematic diagram that Fig. 1 provides for the embodiment of the present invention;
The phase-locked control module structural representation that Fig. 2 provides for the embodiment of the present invention;
The frequency changer schematic diagram that Fig. 3 provides for another embodiment of the present invention;
City's power detection circuit structural representation that Fig. 4 a provides for the embodiment of the present invention;
The load detecting circuit structural representation that Fig. 4 b provides for the embodiment of the present invention;
The circuit diagram of city's power detection circuit that Fig. 5 a provides for the embodiment of the present invention;
The circuit diagram of the load detecting circuit that Fig. 5 b provides for the embodiment of the present invention;
The structural representation of the work frequency conversion handover control system that Fig. 6 provides for the embodiment of the present invention;
The EPS work schematic diagram that Fig. 7 provides for the embodiment of the present invention;
The work frequency variable synchronous method for handover control schematic flow sheet that Fig. 8 provides for the embodiment of the present invention;
The work frequency variable synchronous method for handover control schematic flow sheet that Fig. 9 provides for another embodiment of the present invention.
Embodiment
The embodiment of the present invention provides a kind of frequency converter, work frequency variable synchronous handover control system and method, be used for realizing load input terminal voltage-phase and line voltage Phase synchronization, reduce work frequency conversion and switch the impact to load and frequency converter, stability and the continuation of raising system in the time that work frequency conversion is switched.
Below in conjunction with the accompanying drawing of the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Term " first " in specification of the present invention and claims and above-mentioned accompanying drawing, " second ", " the 3rd " " 4th " etc. (if existence) are for distinguishing similar object, and needn't be used for describing specific order or precedence.The data that should be appreciated that such use suitably can exchanged in situation, so as embodiments of the invention described herein for example can with except diagram here or describe those order enforcement.In addition, term " comprises " and " having " and their any distortion, intention is to cover not exclusive comprising, for example, those steps or unit that process, method, system, product or the equipment that has comprised series of steps or unit is not necessarily limited to clearly list, but can comprise clearly do not list or for these processes, method, product or equipment intrinsic other step or unit.
Below by specific embodiment, be elaborated respectively.
Refer to Fig. 1, the frequency changer schematic diagram that Fig. 1 provides for the embodiment of the present invention; As shown in Figure 1, this frequency converter 10 comprises: voltage detecting circuit 11, phase-locked control module 12 and trunk circuit, and described voltage detecting circuit 11 is connected with described phase-locked control module 12, on described trunk circuit, is provided with inverting output terminal;
Wherein, described voltage detecting circuit comprises city's power detection circuit and load detecting circuit, the input of described city power detection circuit is connected to detect line voltage with the voltage output end of mains-supplied, and the input of described load detecting circuit is connected to detect load input terminal voltage with load voltage input;
Described phase-locked control module is connected with the output of described city power detection circuit and the output of load detecting circuit respectively, and described city power detection circuit, load detecting circuit, phase-locked control module and load voltage input form closed loop phase lock circuitry;
When described load input terminal voltage-phase and described line voltage phase place are when inconsistent, described phase-locked control module, by controlling the voltage-phase of described inverting output terminal, makes described load input terminal voltage-phase consistent with described line voltage phase place.
Be understandable that, in frequency converter 10, include voltage detecting circuit 11, phase-locked control module 12 and trunk circuit, wherein, on trunk circuit, be provided with inverting output terminal, and voltage detecting circuit 11 includes city's power detection circuit 101 and load detecting circuit 102, wherein, city's power detection circuit 101 is directly connected with civil power output, thereby detects line voltage; Load detecting circuit 102 is connected with load input terminal, thereby detects load input terminal voltage, and whether phase-locked control module 12 is obtained after the voltage that voltage detecting circuit 11 detects, consistent with line voltage phase place by Analysis deterrmination load input terminal voltage-phase.In the time determining that both are inconsistent, phase-locked control module 12 passes through to control the voltage-phase of the inverting output terminal on trunk circuit, thereby makes load input terminal voltage-phase consistent with line voltage phase place, realizes load input terminal voltage and synchronizes with line voltage.
In above-mentioned phase-locked control module 12, specifically include sampling module and analysis module, specifically as shown in Figure 2; Wherein, the output of this sampling module 121Yu city power detection circuit 101 is connected, and is connected with the output of load detecting circuit 102 simultaneously.After obtaining line voltage, city's power detection circuit 101 sends sampling module 121 to, load detecting circuit 102 sends sampling module 121 to after obtaining load input terminal voltage, sampling module 121 has received after line voltage and load input terminal voltage, by analysis module 122, line voltage phase place and load input terminal voltage-phase are contrasted, determine that at analysis module 122 load input terminal voltage-phase and line voltage phase place are when inconsistent, controlled the voltage-phase of the inverting output terminal on trunk circuit by analysis module 122, consistent with line voltage phase place to realize load input terminal voltage-phase.
Concrete, the break-make of insulated gate gate pole transistor (IGBT, Insulated Gate Bipolar Translator) by controlling frequency converter is to regulate the voltage-phase of inverting output terminal.
In one embodiment of the invention, on the trunk circuit of above-mentioned provided frequency converter, be also provided with mains electricity input end; Refer to Fig. 3, the frequency changer schematic diagram that Fig. 3 provides for another embodiment of the present invention; In Fig. 3, this mains electricity input end is connected with the voltage output end of mains-supplied.
Refer to Fig. 4 a, the structural representation of the above-mentioned city power detection circuit 101 that Fig. 4 a provides for the embodiment of the present invention; In Fig. 4 a, and in conjunction with Fig. 2, this city's power detection circuit 101 specifically comprises:
Described city power detection circuit comprises the first active link 41, the second active link 42, the 3rd active link 43 and the first negative circuit 44, the first input end of described the first active link 41 is connected with the R in civil power three-phase voltage RST, the input of described the second active link 42 is connected with the S in described civil power three-phase voltage RST, the first input end of described the 3rd active link 43 is connected with the T in described civil power three-phase voltage RST, the output of described the second active link 42 is connected with the second input of described the 3rd active link 43 with the second input of described the first active link 41,
Described the first active link 41 obtains the magnitude of voltage V of RS in described civil power three-phase voltage RST sR, the output of described the first active link 41 is connected with the input of described the first negative circuit 44, and the input of described the first negative circuit 44 is by magnitude of voltage V sRbe transformed into magnitude of voltage V rS, the output of described the first negative circuit 44 is connected with the sampling module 121 of described phase-locked control module 12;
Described the 3rd active link 43 obtains the magnitude of voltage V of ST in described civil power three-phase voltage RST sT, the output of described the 3rd active link 43 is connected with the sampling module 121 of described phase-locked control module 12.
Due to the V obtaining by the first active link 41 and the second active link 42 sRphase place and civil power when input voltage V rSphase place inconsistent, therefore, V sRconverting to after light current analog signal, carrying out reverse-phase processing through the first negative circuit 44, by V sRconvert V to rS.
Refer to Fig. 4 b, the structural representation of the above-mentioned load detecting circuit 102 that Fig. 4 b provides for the embodiment of the present invention; In Fig. 4 b, and in conjunction with Fig. 2, this load detecting circuit 102 specifically comprises:
The 4th active link 45, the 5th active link 46, the 6th active link 47 and the second negative circuit 48;
The first input end of described the 4th active link 45 is connected with the U in load three-phase voltage U VW, the input of described the 5th active link 46 is connected with the V in described load three-phase voltage U VW, the first input end of described the 6th active link 47 is connected with the W in described load three-phase voltage U VW, and the output of described the 5th active link 46 is connected with the second input of described the 6th active link 47 with the second input of described the 4th active link 45;
Described the 4th active link 45 obtains the magnitude of voltage V of UV in described load three-phase voltage U VW vU, the output of described the 4th active link 45 is connected with the input of described the second negative circuit 48, and the input of described the second negative circuit 48 is by magnitude of voltage V vUbe transformed into magnitude of voltage V uV, the output of described the second negative circuit 48 is connected with the sampling module 121 of described phase-locked control module 12;
Described the 6th active link 47 obtains the magnitude of voltage V of VW in described load three-phase voltage U VW vW, the output of described the 6th active link 47 is connected with the sampling module 121 of described phase-locked control module 12.
Wherein, the 4th active link 45 inputs are connected with the U in load three-phase voltage U VW, the 5th active link 46 inputs are connected with the V in load three-phase voltage U VW, the 6th active link 47 inputs are connected with the W in load three-phase voltage U VW, the 4th active link 45, the 5th active link 46 and the 6th active link 47 parallel connections;
Obtain the voltage difference V of UV in load three-phase voltage U VW by the 4th active link 45 and the 5th active link 48 vU, and by this V vUconvert analog signal to according to preset ratio value, the 4th active link 45 outputs are connected with these the second negative circuit 48 inputs, and the output of this second negative circuit 48 is connected with the sampling module 121 of above-mentioned phase-locked control module 12;
Obtain the voltage difference V of VW in load three-phase voltage U VW by the 5th active link 46 and the 6th active link 47 vW, and by this V vWconvert analog signal to according to preset ratio value, the 6th active link 47 outputs are connected with the sampling module 121 of above-mentioned phase-locked control module 12.
Be understandable that the V obtaining by the 4th active link 45 and the 5th active link 46 vUphase place and voltage V when load input terminal uVphase place inconsistent, therefore, V vUconverting to after light current analog signal, carrying out reverse-phase processing through the second negative circuit 48, by V vUconvert V to uV.
Further, as shown in Figure 5 a, and in conjunction with Fig. 4 a, above-mentioned load detecting circuit 102 circuit diagrams have been described in Fig. 5 a in further detail.In 5a, the first active link comprises the first resistance R 1, the 5th resistance R 5, the 7th resistance R 7, the first capacitor C 1, the first amplifier U1 and the first clamp diode D1; Wherein, one end of described the first resistance R 1 is the first input end of described the first active link, is connected with the R in described civil power three-phase voltage RST; After described the 5th resistance R 5 is in parallel with the first capacitor C 1, be connected between the inverting input and output of the first amplifier U1, the inverting input of described the first amplifier U1 is connected with the first clamp diode D1; The in-phase input end of described the first amplifier U1 is the second input of the first active link, and the output of described the first amplifier U1 is the output of the first active link;
The second active link comprises: the second resistance R 2, the second clamp diode D2, the 4th resistance R 4 and the second capacitor C 2; Wherein, one end of described the second resistance R 2 is the input of described the second active link, is connected with the S in described civil power three-phase voltage RST; The other end of described the second resistance R 2 is ground connection after described the 4th resistance R 4 of parallel connection and the second capacitor C 2; The other end of described the second resistance R 2 is connected with the second clamp diode D2; The other end of described the second resistance R 2 is the output of the second active link;
The 3rd active link comprises the 3rd resistance R 3, the 6th resistance R 6, the second amplifier U2 and the 3rd capacitor C 3; Wherein, one end of described the 3rd resistance R 3 is the input of the second active link, is connected with the T in described civil power three-phase voltage RST; The other end of described the 3rd resistance R 3 is connected with the inverting input of described the second amplifier U2, is connected with respectively described the 6th resistance R 6 and three capacitor C 3 between the inverting input of described the second amplifier U2 and output; The inverting input of described the second amplifier U2 is connected with described the 3rd clamp diode D3; The in-phase input end of described the second amplifier U2 is the second input of the 3rd active link, and the output of described the second amplifier U2 is the output of described the 3rd active link;
Described the first negative circuit comprises the 8th resistance R 8, the 9th resistance R 9 and the 3rd amplifier U3; The inverting input of described the 3rd amplifier U3 is the input of described the first negative circuit, and described the 3rd output of amplifier U3 and the sampling module of described phase-locked control module are connected; Described the 8th resistance R 8 is connected between the inverting input and output of described the 3rd amplifier U3; The in-phase input end of described the 3rd amplifier U3 is through the 9th resistance R 9 ground connection.
Be understandable that, R1, R2 and R3 are current-limiting resistance, are connected respectively with input R, S, the T of civil power three-phase voltage RST, and civil power is carried out to current limliting, and protection city's power detection circuit causes short circuit in order to avoid electric current is excessive.
R4 is build-out resistor, and D1~D3 is clamp diode, and Main Function is guard amplifier U1 and U2.Be understandable that, include inverting input, in-phase input end and output in U1, as shown in Fig. 5 a, 1 represents the output of U1, and 2 represent the inverting input of U1, and 3 represent the in-phase input end of U1; In the same manner, 7 in U2 represents output, and 5 represent in-phase input end, and 6 represent inverting input; In U3 1 represents output, and 2 represent inverting input, and 3 represent in-phase input end.
Wherein, clamp diode D1 has three links: input 1,2 and output 3, wherein, connect-15v of input 1, connect+15V of input 2, output 3 is connected with the inverting input of U1, thereby can carry out clamper to the anti-phase input terminal voltage of U1 by D1, make the operating voltage of inverting input of U1 between (15V ,+15v), described ± 15V is the operating voltage of amplifier U1.
Similarly, clamp diode D2 has input 1,2 and output 3, wherein, connect-15v of input 1, connect+15V of input 2, output 3 is connected with the in-phase input end of U1, thereby can carry out clamper to the in-phase input end voltage of U1 by D2, make the operating voltage of in-phase input end of U1 between (15V ,+15v); In addition, the output of D2 is also connected with the in-phase input end of U2, thereby can carry out clamper to the in-phase input end voltage of U2 by D2, makes the operating voltage of in-phase input end of U2 at (15V, + 15v) between, described ± 15V is the operating voltage of amplifier U1 and U2.
Similarly, D3 has input 1,2 and output 3, wherein, connect-15v of input 1, connect+15V of input 2, output 3 is connected with the inverting input of U2, thereby can carry out clamper to the anti-phase input terminal voltage of U2 by D3, make the operating voltage of inverting input of U2 between (15V ,+15v), described ± 15V is the operating voltage of amplifier U2.
U3 is included in the first negative circuit, by the operating voltage of U1 and U2 being carried out to, after clamper, also further limited the operating voltage of U3, has protected U3.
Alternatively, above-mentioned D1, D2 and D3 can also be biswitch diodes.
C1~C3 is filter capacitor, and voltage is carried out to filtering processing.
U3 and R8, R9 form the first negative circuit.After gathering line voltage, be scaled to corresponding light current analog signal V in the ratio of R1/R5 sRand V sT.Alternatively, can carry out convergent-divergent according to the ratio of 1000:3.Shown in the circuit diagram of Fig. 5 a, the voltage V collecting sRwith V rSsingle spin-echo, therefore, V sRthrough negative circuit, its phase place is converted to V rS, guarantee its phase equalization.
Identical with city's power detection circuit, as shown in Figure 5 b, the 4th active link in load detecting circuit comprises the tenth resistance R the 10, the 13 resistance R the 13, the 16 resistance R 16, the 4th capacitor C 4, the 4th amplifier U4 and the 4th clamp diode D4;
Wherein, one end of described the tenth resistance R 10 is the first input end of described the 4th active link, is connected with the U in described load three-phase voltage U VW; After described the 13 resistance R 13 is in parallel with the 4th capacitor C 4, be connected between the inverting input and output of the 4th amplifier U4, the inverting input of described the 4th amplifier U4 is connected with the 4th clamp diode D4; The in-phase input end of described the 4th amplifier U4 is the second input of described the 4th active link, and the output of described the 4th amplifier U4 is the output of the 4th active link;
The 5th active link comprises the 11 resistance R 11, the 5th clamp diode D5, the 14 resistance R 14 and the 5th capacitor C 5;
Wherein, one end of described the 11 resistance R 11 is the input of described the 5th active link, is connected with the V in described load three-phase voltage U VW; Ground connection after described the 14 resistance R 14 of the other end of described the 11 resistance R 11 through being connected in parallel and the 5th capacitor C 5; The other end of described the 11 resistance R 11 is connected with described the 5th clamp diode D5; The other end of described the 11 resistance R 11 is the output of the 5th active link;
The 6th active link comprises the 12 resistance R the 12, the 15 resistance R 15, the 5th amplifier U5, the 6th capacitor C 6 and the 6th clamp diode D6;
Wherein, one end of described the 12 resistance R 12 is the input of described the 6th active link, is connected with the W in described load three-phase voltage U VW; The other end of described the 12 resistance R 12 is connected with the inverting input of described the 5th amplifier U5, is connected with respectively described the 15 resistance R 15 and the 6th capacitor C 6 between the inverting input of described the 5th amplifier U5 and output; The inverting input of described the 5th amplifier U5 is connected with the 6th clamp diode D6; The in-phase input end of described the 5th amplifier U5 is the second input of described the 6th active link, and the output of described the 5th amplifier U5 is the output of described the 6th active link;
The second negative circuit comprises the 17 resistance R the 17, the 18 resistance R 18 and the 6th amplifier U6;
Wherein, the inverting input of described the 6th amplifier U6 is the input of described the second negative circuit, and described the 6th output of amplifier U6 and the sampling module of described phase-locked control module are connected; Described the 17 resistance R 17 is connected between the inverting input and output of described the 6th amplifier U6, and the in-phase input end of described the 6th amplifier U6 is through the 18 resistance R 18 ground connection.
Be understandable that, R10, R11 and R12 are current-limiting resistance, connect respectively U, V, the W input of load three-phase voltage U VW, and civil power is carried out to current limliting, and protection load detecting circuit causes short circuit in order to avoid electric current is excessive.
R14 is build-out resistor, and D4~D6 is clamp diode, and Main Function is guard amplifier U4, U5 and U6.Be understandable that, include inverting input, in-phase input end and output in U4, as shown in Fig. 5 b, 1 represents the output of U4, and 2 represent the inverting input of U4, and 3 represent the in-phase input end of U4; In the same manner, 7 in U5 represents output, and 5 represent in-phase input end, and 6 represent inverting input; In U6 1 represents output, and 2 represent inverting input, and 3 represent in-phase input end.
Wherein, D4 has three links: input 1,2 and output 3, wherein, connect-15v of input 1, connect+15V of input 2, output 3 is connected with the inverting input of U4, thereby can carry out clamper to the anti-phase input terminal voltage of U4 by D4, make the operating voltage of inverting input of U4 between (15V ,+15v), described ± 15V is the operating voltage of amplifier U4.
Similarly, D5 has input 1,2 and output 3, wherein, connect-15v of input 1, connect+15V of input 2, output 3 is connected with the in-phase input end of U4, thereby can carry out clamper to the in-phase input end voltage of U4 by D5, make the operating voltage of in-phase input end of U4 between (15V ,+15v); In addition, the output of D5 is also connected with the in-phase input end of U5, U5 obtains the operating voltage of in-phase input end by D5 so, it is second voltage, thereby can carry out clamper to the in-phase input end voltage of U5 by D5, make the operating voltage of in-phase input end of U5 between (15V ,+15v), described ± 15V is the operating voltage of amplifier U4 and U5.
Similarly, D6 has input 1,2 and output 3, wherein, connect-15v of input 1, connect+15V of input 2, output 3 is connected with the inverting input of U5, thereby can carry out clamper to the anti-phase input terminal voltage of U5 by D6, make the operating voltage of inverting input of U5 between (15V ,+15v), described ± 15V is the operating voltage of amplifier U5.
U6 is included in the second negative circuit, by the operating voltage of U4 and U5 being carried out to, after clamper, also further limited the operating voltage of U6.
Alternatively, above-mentioned D4, D5 and D5 can also be biswitch diodes.
C4~C6 is filter capacitor, and voltage is carried out to filtering processing.
U6 and R17, R18 form negative circuit.Gather load input terminal voltage V vUand V vWbe scaled to corresponding light current analog signal V in the ratio of R10/R13 afterwards vUand V vW.Alternatively, specifically can carry out convergent-divergent according to the ratio of 1000:3.Shown in the circuit diagram of Fig. 5 b, the voltage V collecting vUand V uVsingle spin-echo, therefore, V vUthrough negative circuit, its phase place is converted to V uV, guarantee its phase equalization.
In conjunction with Fig. 2~Fig. 5 b, be understandable that the light current analog signal V that city's power detection circuit obtains rSand V sTsend to the sampling module 121 of phase-locked control module 12, the light current analog signal V that load detecting circuit obtains uVand V vWthe sampling module 121 that sends to phase-locked control module 12, acquisition module 121 is according to V rS, V sT, V uVand V vWobtain respectively the phase place of line voltage and the phase place of load input terminal voltage, then relatively whether load input terminal voltage-phase is consistent with line voltage phase place, when definite load input terminal voltage-phase and line voltage phase place are when inconsistent, analysis module is by the voltage-phase of the inverting output terminal on the trunk roads of control frequency converter, consistent with line voltage phase place to realize load input terminal voltage-phase, can realize work frequency variable synchronous and switch.
Particularly, can also analyze line voltage phase place and frequency by analysis module, if determine, it has phase shortage, inverted sequence etc. abnormal, to quote mains input voltage open-phase fault code (voltage input phase lack, be called for short VIPL) fault, or load feedback voltage open-phase fault code (voltage output phase lack is called for short UOPL) fault, to reexamine correction to frequency converter wiring and city's signal of telecommunication.
Similarly, analysis module is by analyzing load input terminal voltage-phase and frequency, if determine, it has phase shortage, inverted sequence etc. abnormal, to quote the anti-phase failure code in mains input voltage (voltage input phase reverse, be called for short UIPE) fault, or load feedback voltage inversion failure code (voltage output phase reverse is called for short UOPE) fault, so that correction is reexamined in wiring to frequency converter.
Frequency converter arrange errorless after, enter normal operational phase, analysis module obtains line voltage and load input terminal voltage from city's power detection circuit and load detecting circuit in real time, and judge that whether load input terminal voltage-phase is consistent with line voltage phase place, if inconsistent, adopt the mode of approaching fast, control the phase place of the inverting output terminal voltage in frequency converter, make fast load input terminal voltage-phase consistent with line voltage phase place, reach the phase-locked object of closed loop.
In the time that the two phase place is consistent and stablize, analysis module also will be exported phase-locked successful information, be given to outside switching device shifter, realize synchronously and switch.Analysis module, by Real-Time Monitoring load input terminal voltage, is dynamically adjusted the voltage of inverting output terminal output in addition, guarantees the stability of load input terminal voltage.
In addition, the processing such as device, transformer after filtering of the voltage of the inverting output terminal in frequency converter, and then be connected to the input of load detecting circuit.
Be understandable that, in the above-mentioned frequency converter providing, the voltage-phase of inverting output terminal can regulate, and line voltage is unmodifiable, load input terminal voltage-phase can regulate by the voltage-phase that regulates inverting output terminal, therefore, can be by line voltage phase place and load input terminal voltage-phase be monitored in real time, guarantee that line voltage phase place and load input terminal voltage-phase are synchronous, in the time that civil power is switched to frequency converter or frequency converter and is switched to civil power, can supplement voltage drop in moment, impact to load and frequency converter when power frequency is switched in minimizing prior art.
The embodiment of the present invention also provides a kind of work frequency variable synchronous handover control system, in this work frequency variable synchronous handover control system, apply above-mentioned introduced frequency converter, as shown in Figure 6, a kind of work frequency variable synchronous handover control system 600 can comprise: the frequency converter 10 that handover module 610, load 620 and control module 630 and above-mentioned Fig. 1~Fig. 5 b introduce;
Wherein, described load 620 is connected with civil power and described frequency converter 10 respectively after handover module 610, described control module 630 is connected with described handover module 610 with described frequency converter 10 respectively, described control module 630 receives the lockin signal that described frequency converter 10 sends, at described lockin signal indicating lock mutually successfully in situation, control described handover module 610 described load 620 is switched on civil power or described frequency converter to 10.
In preferred embodiment of the present invention, between the inverting output terminal of the input of above-mentioned load 620 and frequency converter 10, can also be connected the equipment that produces phase shift, as transformer or filter etc., the inverting output terminal voltage of frequency converter 10 is through after producing the equipment of phase shift, voltage-phase changes, cause the voltage-phase of the load detecting circuit input in inverting output terminal voltage and frequency converter inconsistent, and the voltage of load detecting circuit input is load input terminal voltage.Be understandable that, the phase place of load input terminal voltage can not change, and can pass through to control the phase place of inverting output terminal voltage, and then the voltage-phase of control load testing circuit input, realizes load input terminal voltage-phase consistent with line voltage phase place.
In another preferred embodiment of the present invention, the input of frequency converter 10 is electrically connected with city.
Wherein, handover module can be diverter switch.
The work frequency variable synchronous handover control system that above-mentioned Fig. 6 introduces can be storage battery (Electric Power Storage is called for short EPS).Refer to Fig. 7, the work schematic diagram that Fig. 7 is EPS.As shown in Figure 7, above-mentioned application of frequency converter is in this EPS system, phase-locked control module in frequency converter is connected with the control module in EPS system, inverting output terminal after filtering device and transformer is connected on handover module, connect load by switched system, load can include lighting load and ohmic load etc.In addition, frequency converter is also connected with dc-battery group.
In the time that mains-supplied is normal, civil power powering load is given inverter supply simultaneously, and now frequency converter belongs to unloaded homophase output, city's power detection circuit obtains line voltage, and line voltage is converted in the phase-locked control module that corresponding analog signal RST delivers to frequency converter; Load detecting circuit obtains load input terminal voltage, become corresponding analog signal U1V1W1 to deliver to the phase-locked control module of frequency converter load input terminal voltage transitions, analyze by phase-locked control module, on algorithm, realize U1V1W1 consistent with RST phase place, the control module of simultaneously lockin signal being delivered to EPS system, now dc-battery group is in charged state.When civil power unusual fluctuations, or when power down, frequency converter keeps former phase place output, control module monitors city's electrical anomaly simultaneously, controls immediately diverter switch load switching is exported to frequency converter, frequency converter moment compensation drop-off voltage, guarantee the stability of output voltage, with the normal work of proof load.In the time that city power recovery is normal, frequency converter detects civil power phase place again, on algorithm, realize U1V1W1 phase place and line voltage RST Phase synchronization, phase-locked control module detects that civil power is normal, detect the lockin signal that frequency converter is brought simultaneously, control diverter switch to civil power, is guaranteed continuing with stable of system load switching.
Above-mentioned work frequency variable synchronous handover control system can also be applied on staircase.In the time that it is used on staircase, synchronously carry out work frequency conversion switching according to the loading condition on staircase, while having people, staircase is switched on civil power, adopts power frequency at a high speed; Nobody time be switched on frequency converter, adopt variable frequency low speed, promoted electric energy efficiency, saved energy consumption.
Refer to Fig. 8, the embodiment of the present invention also provides a kind of control method based on work frequency variable synchronous handover control system; As shown in Figure 8, a kind of work frequency variable synchronous method for handover control comprises:
S801, frequency converter obtain line voltage and load input terminal voltage;
The embodiment of the present invention, based on the above-mentioned frequency converter providing, about structure and the operation principle of frequency converter please refer to above-mentioned explanation, does not repeat them here.
Wherein, obtain line voltage by frequency converter Zhong city power detection circuit, obtain load input terminal voltage by load detecting circuit.The line voltage obtaining and load input terminal voltage will send phase-locked control module to.
S802, described frequency converter judge that whether described load input terminal voltage-phase is consistent with described line voltage phase place;
If inconsistent, will turn to step S803.
Wherein, phase-locked control module obtains respectively line voltage and load input terminal voltage from city's power detection circuit and load detecting circuit, obtain the phase place of line voltage according to line voltage, with the phase place of obtaining load input terminal voltage according to load input terminal voltage, further judge that whether load input terminal voltage-phase is consistent with line voltage phase place.
If the described load input terminal voltage-phase of S703 and described line voltage phase place are inconsistent, described Frequency Converter Control inverting output terminal voltage-phase, to make described load input terminal voltage-phase consistent with described line voltage phase place, and export lockin signal and so that described control module according to described lockin signal, is controlled described handover module, described load is switched on described frequency converter or civil power.
In load input terminal voltage-phase and line voltage phase place when inconsistent, phase-locked control module is by controlling the inverting output terminal voltage-phase in frequency converter, make load input terminal voltage-phase consistent with described line voltage phase place, realize closed loop phase-locked, after phase-locked success, export lockin signal.Control module in work frequency variable synchronous handover control system receives lockin signal, controls according to demand handover module load is switched on frequency converter or civil power.
Be understandable that, control module, in the situation that receiving phase-locked successful signal, is controlled according to demand handover module load is switched on frequency converter or civil power.
Particularly, above-mentioned work frequency variable synchronous handover control system can be that EPS system also can be applied on staircase, and in the time that it is EPS system, in the time that civil power is normal, handover module control load connects civil power; In the time of city's electrical anomaly, handover module control load connects frequency converter; In the time that it is used on staircase, while having people, staircase is switched on civil power, adopts power frequency at a high speed; Nobody time be switched on frequency converter, adopt variable frequency low speed.
Refer to Fig. 9, the work frequency variable synchronous method for handover control schematic flow sheet that Fig. 9 provides for another embodiment of the present invention; As shown in Figure 9, a kind of work frequency variable synchronous method for handover control comprises:
S901, frequency converter obtain line voltage and load input terminal voltage;
The frequency converter that the embodiment of the present invention provides, except the trunk roads that common frequency converter possesses, also includes voltage detecting circuit and phase-locked control module, and wherein, voltage detecting circuit includes city's power detection circuit and load detecting circuit; Phase-locked control module includes sampling module and analysis module, and sampling module obtains respectively line voltage and load input terminal voltage from city's power detection circuit and load detecting circuit.
Particularly, sampling module can light current analog signal corresponding to described line voltage convert to according to preset ratio value, and according to preset ratio value, described load input terminal voltage transitions is become to corresponding light current analog signal.
S902, described frequency converter judge that whether described line voltage phase place is consistent with described load input terminal voltage-phase;
Obtained the phase place of line voltage by analysis module according to line voltage, and obtain the phase place of load input terminal voltage according to load input terminal voltage, further judge that whether load input terminal voltage-phase is consistent with line voltage phase place.
If not, turn to step S903,
S903, described Frequency Converter Control inverting output terminal voltage-phase, make load input terminal voltage-phase consistent with line voltage phase place;
S904, described frequency converter send lockin signal to control module;
Particularly, the equipment that analysis module also switches control to external with frequency converter send phase-locked become function signal, carry out work frequency conversion switching to control the equipment switching.
S905, described control module, according to described lockin signal, are controlled handover module load are switched on frequency converter or civil power.
Be understandable that, be switched to frequency converter or civil power, according to practical situations, such as in the time that work frequency variable synchronous handover control system is EPS system, in the time that civil power is normal, handover module control load connects civil power; In the time of city's electrical anomaly, handover module control load connects frequency converter; In the time that work frequency variable synchronous handover control system is used on staircase, while having people, staircase is switched on civil power, adopts power frequency at a high speed; Nobody time be switched on frequency converter, adopt variable frequency low speed.
Be understandable that, the present invention is upper outside except being applied to EPS system and the staircase of above-mentioned introduction, and the work frequency conversion that can also apply fire-fighting domain is switched in occasion, in this no limit.
In the time that frequency converter rigidly connects into use, can also analyze line voltage phase place and frequency by analysis module, if determine, it has phase shortage, inverted sequence etc. abnormal, will quote VIPL fault, or UOPL fault, to reexamine correction to frequency converter wiring and city's signal of telecommunication.
Similarly, analysis module is by analyzing load input terminal voltage-phase and frequency, if determine, it has phase shortage, inverted sequence etc. abnormal, will quote UIPE fault, or UOPE fault, so that correction is reexamined in wiring to frequency converter.
In the above-described embodiments, the description of each embodiment is all emphasized particularly on different fields, in certain embodiment, there is no the part of detailed description, can be referring to the associated description of other embodiment.
Those skilled in the art can be well understood to, and for convenience and simplicity of description, the specific works process of the circuit of foregoing description and module, can, with reference to the corresponding process in preceding method embodiment, not repeat them here.
One of ordinary skill in the art will appreciate that all or part of step realizing in above-described embodiment method is can carry out the hardware that instruction is relevant by program to complete, described program can be stored in a kind of computer-readable recording medium, comprise that some instructions (can be personal computers in order to make a computer equipment, server, or the network equipment etc.) carry out all or part of step of method described in each embodiment of the present invention.And aforesaid storage medium comprises: various media that can be program code stored such as USB flash disk, portable hard drive, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disc or CDs.
Above a kind of work frequency variable synchronous handover control system provided by the present invention and method, frequency converter are described in detail, for one of ordinary skill in the art, according to the thought of the embodiment of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.

Claims (11)

1. a frequency converter, is characterized in that, comprises voltage detecting circuit, phase-locked control module and trunk circuit, and described voltage detecting circuit is connected with described phase-locked control module, on described trunk circuit, is provided with inverting output terminal;
Wherein, described voltage detecting circuit comprises city's power detection circuit and load detecting circuit, the input of described city power detection circuit is connected to detect line voltage with the voltage output end of civil power, and the input of described load detecting circuit is connected to detect load input terminal voltage with load voltage input;
Described phase-locked control module is connected with the output of described city power detection circuit and the output of load detecting circuit respectively, and described city power detection circuit, load detecting circuit, phase-locked control module and load voltage input form closed loop phase lock circuitry;
When described load input terminal voltage-phase and described line voltage phase place are when inconsistent, described phase-locked control module, by controlling the voltage-phase of described inverting output terminal, makes described load input terminal voltage-phase consistent with described line voltage phase place.
2. frequency converter according to claim 1, is characterized in that, described phase-locked control module comprises sampling module and analysis module;
Described sampling module is connected with the output of described city power detection circuit and obtains the line voltage that described city power detection circuit detects;
Described sampling module is also connected with the output of described load detecting circuit and obtains the load input terminal voltage that described load detecting circuit obtains;
Described analysis module is connected with described sampling module, analyze contrast by line voltage phase place and load input terminal voltage-phase that described sampling module is obtained, when described load input terminal voltage-phase and described line voltage phase place are when inconsistent, control the voltage-phase of described inverting output terminal, make described load input terminal voltage-phase and described line voltage phase place consistent.
3. frequency converter according to claim 2, it is characterized in that, described city power detection circuit comprises the first active link, the second active link, the 3rd active link and the first negative circuit, the first input end of described the first active link is connected with the R in civil power three-phase voltage RST, described the second active link input is connected with the S in described civil power three-phase voltage RST, the first input end of described the 3rd active link is connected with the T in described civil power three-phase voltage RST, the output of described the second active link is connected with the second input of described the 3rd active link with the second input of described the first active link,
Described the first active link obtains the magnitude of voltage V of RS in described civil power three-phase voltage RST sR, the output of described the first active link is connected with the input of described the first negative circuit; Described the first negative circuit is by magnitude of voltage V sRbe transformed into magnitude of voltage V rS, the output of described the first negative circuit is connected with the sampling module of described phase-locked control module;
Described the 3rd active link obtains the magnitude of voltage V of ST in described civil power three-phase voltage RST sT, described the 3rd output of active link and the sampling module of described phase-locked control module are connected.
4. frequency converter according to claim 3, it is characterized in that, described the first active link comprises the first resistance R 1, the 5th resistance R 5 and the 7th resistance R 7 of series connection, one end of described the first resistance R 1 is the first input end of described the first active link, is connected with the R in described civil power three-phase voltage RST; After described the 5th resistance R 5 is in parallel with the first capacitor C 1, be connected between the inverting input and output of the first amplifier U1, the inverting input of described the first amplifier U1 is connected with described the first clamp diode D1; The in-phase input end of described the first amplifier U1 is the second input of the first active link, and the output of described the first amplifier U1 is the output of the first active link;
Described the second active link comprises the second resistance R 2, the second clamp diode D2, the 4th resistance R 4 and the second capacitor C 2; One end of described the second resistance R 2 is the input of described the second active link, is connected with the S in described civil power three-phase voltage RST; The other end of described the second resistance R 2 is ground connection after described the 4th resistance R 4 of parallel connection and the second capacitor C 2; The other end of described the second resistance R 2 is connected with the second clamp diode D2; The other end of described the second resistance R 2 is the output of the second active link;
Described the 3rd active link comprises the 3rd resistance R 3, the 6th resistance R 6, the second amplifier U2, the 3rd capacitor C 3 and the 3rd clamp diode D3; One end of described the 3rd resistance R 3 is the input of the second active link, is connected with the T in described civil power three-phase voltage RST; The other end of described the 3rd resistance R 3 is connected with the inverting input of described the second amplifier U2, is connected with respectively described the 6th resistance R 6 and three capacitor C 3 between the inverting input of described the second amplifier U2 and output; The inverting input of described the second amplifier U2 is connected with described the 3rd clamp diode D3; The in-phase input end of described the second amplifier U2 is the second input of the 3rd active link, and the output of described the second amplifier U2 is the output of described the 3rd active link;
Described the first negative circuit comprises the 8th resistance R 8, the 9th resistance R 9 and the 3rd amplifier U3; The inverting input of described the 3rd amplifier U3 is the input of described the first negative circuit, and described the 3rd output of amplifier U3 and the sampling module of described phase-locked control module are connected; Described the 8th resistance R 8 is connected between the inverting input and output of described the 3rd amplifier U3; The in-phase input end of described the 3rd amplifier U3 is through the 9th resistance R 9 ground connection.
5. frequency converter according to claim 2, it is characterized in that, described load detecting circuit comprises the 4th active link, the 5th active link, the 6th active link and the second negative circuit, the first input end of described the 4th active link is connected with the U in load three-phase voltage U VW, the input of described the 5th active link is connected with the V in described load three-phase voltage U VW, the first input end of described the 6th active link is connected with the W in described load three-phase voltage U VW, the output of described the 5th active link is connected with the second input of described the 6th active link with the second input of described the 4th active link,
Described the 4th active link obtains the magnitude of voltage V of UV in described load three-phase voltage U VW vU, the output of described the 4th active link is connected with the input of described the second negative circuit, and the input of described the second negative circuit is by magnitude of voltage V vUbe transformed into magnitude of voltage V uV, the output of described the second negative circuit is connected with the sampling module of described phase-locked control module;
Described the 6th active link obtains the magnitude of voltage V of VW in described load three-phase voltage U VW vW, described the 6th output of active link and the sampling module of described phase-locked control module are connected.
6. frequency converter according to claim 5, is characterized in that, described the 4th active link comprises the tenth resistance R the 10, the 13 resistance R the 13 and the 16 resistance R 16 of series connection; One end of described the tenth resistance R 10 is the first input end of described the 4th active link, is connected with the U in described load three-phase voltage U VW; After described the 13 resistance R 13 is in parallel with the 4th capacitor C 4, be connected between the inverting input and output of the 4th amplifier U4, the inverting input of described the 4th amplifier U4 is connected with the 4th clamp diode D4; The in-phase input end of described the 4th amplifier U4 is the second input of described the 4th active link, and the output of described the 4th amplifier U4 is the output of the 4th active link;
Described the 5th active link comprises the 11 resistance R 11, the 5th clamp diode D5, the 14 resistance R 14 and the 5th capacitor C 5; One end of described the 11 resistance R 11 is the input of described the 5th active link, is connected with the V in described load three-phase voltage U VW; Ground connection after described the 14 resistance R 14 of the other end of described the 11 resistance R 11 through being connected in parallel and the 5th capacitor C 5; The other end of described the 11 resistance R 11 is connected with described the 5th clamp diode D5; The other end of described the 11 resistance R 11 is the output of the 5th active link;
Described the 6th active link comprises the 12 resistance R the 12, the 15 resistance R 15, the 5th amplifier U5, the 6th capacitor C 6 and the 6th clamp diode D6; One end of described the 12 resistance R 12 is the input of described the 6th active link, is connected with the W in described load three-phase voltage U VW; The other end of described the 12 resistance R 12 is connected with the inverting input of described the 5th amplifier U5, is connected with respectively described the 15 resistance R 15 and the 6th capacitor C 6 between the inverting input of described the 5th amplifier U5 and output; The inverting input of described the 5th amplifier U5 is connected with the 6th clamp diode D6; The in-phase input end of described the 5th amplifier U5 is the second input of described the 6th active link, and the output of described the 5th amplifier U5 is the output of described the 6th active link;
Described the second negative circuit comprises the 17 resistance R the 17, the 18 resistance R 18 and the 6th amplifier U6; The inverting input of described the 6th amplifier U6 is the input of described the second negative circuit, and described the 6th output of amplifier U6 and the sampling module of described phase-locked control module are connected; Described the 17 resistance R 17 is connected between the inverting input and output of described the 6th amplifier U6, and the in-phase input end of described the 6th amplifier U6 is through the 18 resistance R 18 ground connection.
7. the work frequency variable synchronous handover control system of the frequency converter of an application rights requirement 1, it is characterized in that, comprise: handover module, load and control module and the frequency converter as described in any one in claim 1 to 6, described load is connected with civil power and described frequency converter respectively after described handover module, described control module is connected with described handover module with described frequency converter respectively, described control module receives the lockin signal that described frequency converter sends, at described lockin signal indicating lock mutually successfully in situation, controlling described handover module is switched to described load on civil power or described frequency converter.
8. work frequency variable synchronous handover control system according to claim 7, is characterized in that, is connected with the equipment that produces phase shift between described load input terminal and described frequency converter inverting output terminal.
9. according to the work frequency variable synchronous handover control system described in claim 7 or 8, it is characterized in that, described frequency converter is connected with DC power supply, and described DC power supply is charged during at power frequency state at loaded work piece, after described civil power power down for described frequency converter provides working power;
When civil power is normal, described handover module control load connects civil power; When described city electrical anomaly, described handover module control load connects frequency converter.
10. a method for the work frequency variable synchronous handover control system based on claim 7, is characterized in that, comprising:
Frequency converter obtains line voltage and load input terminal voltage;
Described frequency converter judges that whether described load input terminal voltage-phase is consistent with described line voltage phase place;
If described load input terminal voltage-phase and described line voltage phase place are inconsistent, described Frequency Converter Control inverting output terminal voltage-phase, to make described load input terminal voltage-phase consistent with described line voltage phase place, and export lockin signal and so that described control module according to described lockin signal, is controlled described handover module, described load is switched on described frequency converter or civil power.
11. methods according to claim 10, is characterized in that, also comprise:
In the time that described civil power is normal, load connects civil power described in described handover module control; In the time of described city electrical anomaly, load connects described frequency converter described in described handover module control.
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Cited By (4)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105471085A (en) * 2015-12-23 2016-04-06 北京动力源科技股份有限公司 Power frequency-variable frequency switching control method and apparatus and high voltage inverter
CN106527648A (en) * 2016-10-25 2017-03-22 郑州云海信息技术有限公司 Power supply device and method of server
CN106655470A (en) * 2016-12-24 2017-05-10 漳州科华技术有限责任公司 Uninterrupted power supply and control method thereof
CN106655470B (en) * 2016-12-24 2019-06-14 漳州科华技术有限责任公司 A kind of uninterruptible power supply and its control method
CN109921717A (en) * 2017-12-12 2019-06-21 日立楼宇技术(广州)有限公司 Escalator is exchanged work switches compensation angle method of adjustment and system frequently
CN109921717B (en) * 2017-12-12 2021-01-26 日立楼宇技术(广州)有限公司 Method and system for adjusting variable working frequency switching compensation angle of escalator

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