CN104158282A - Dual-circuit switching control power circuit and high-voltage inverter - Google Patents
Dual-circuit switching control power circuit and high-voltage inverter Download PDFInfo
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- CN104158282A CN104158282A CN201410349774.5A CN201410349774A CN104158282A CN 104158282 A CN104158282 A CN 104158282A CN 201410349774 A CN201410349774 A CN 201410349774A CN 104158282 A CN104158282 A CN 104158282A
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Abstract
The invention relates to a dual-circuit switching control power circuit. The dual-circuit switching control power circuit comprises a power switching module and a voltage converter module, wherein the power switching module comprises a first switching unit and a second switching unit; the first switching unit comprises a first AC contactor, a first relay and a first control circuit branch; the first control circuit branch is in series connection with a coil of the first AC contactor, a normally-open auxiliary contact of the first relay, and a normally-closed auxiliary contact of a second AC contactor; the second switching unit comprises the second AC contactor, a second relay and a second control circuit branch; the second control circuit branch is in series connection with a coil of the second AC contactor, a normally-open auxiliary contact of the second relay, and a normally-closed auxiliary contact of the first AC contactor. The dual-circuit switching control power circuit is reliable and stable, and can be used in a high-voltage inverter. According to the invention, electrical interlock is adopted in the two switching units, so that the effectiveness of the dual-circuit switching is improved, the relays are additionally arranged to realize default phase detection, and the system reliability is improved by combining the mechanical interlock.
Description
Technical field
The present invention relates to power circuit technical field, more particularly, relate to a kind of two-way switching controls power circuit and high voltage converter.
Background technology
Along with rapid development of economy, also surging all the more to the cry that product is energy-conservation, excite greatly the market demand of high voltage converter.Meanwhile, runnability and the reliability requirement of increasing client to high voltage converter is also more and more higher.As the control power supply importance of mentioning guarantee before high voltage converter system reliability service, also more and more carry out many personnel that are designed and pay attention to.Most of high voltage converter control Power supply source side case is in the market following two schemes: the first scheme, and provide 380V power supply as unique power supply taking user, convert the required power supply of system to through transformer-supplied change-over circuit simultaneously; Because high voltage converter control Power supply is controlled power supply by unique user and provided, if this controls power-fail, whole high voltage converter cannot run well.First scheme, provides 380V power supply as main electricity taking user, provides a part to control main power source through high-pressure side phase shifting transformer simultaneously, and this scheme has improved the reliability of high voltage converter power supply by two-way control electrical source exchange.
But the switching reliability of market existing two-way switching controls power circuit is not high, can not ensure the effective switching between the input of two-way control power supply completely.In addition, also there is following defect in two-way switching controls power circuit, causes in high voltage converter, applying well, also affected the reliability of high voltage converter.For example do not detect containing input power phase shortage,, in the situation that power supply disconnects mutually, Switching power cannot action message.The design of machinery-free interlock function, the situation that can lose efficacy at electrical interlocks causes double loop power supply to be powered simultaneously.The control of fortuitous event electricity power-off simultaneously cannot be preserved fault data in time.Because of external control wiring error or the aging control short circuit causing of cable cannot obtain in time, effectively excision etc.
Summary of the invention
The technical problem to be solved in the present invention is, not high and do not there is the defect that phase shortage detects for the switching reliability of existing two-way switching controls power circuit, a kind of have the two-way switching controls power circuit that electrical interlocks and phase shortage detect and the high voltage converter that uses this two-way switching controls power circuit are provided.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of two-way switching controls power circuit, comprise the electrical source exchange module of switching between the first input power and the second input power, and for input power being converted to the voltage transformation module of required output voltage, described electrical source exchange module comprises:
The first switch unit, comprise the first A.C. contactor, the first relay and the first control branch road, the main contact of described the first A.C. contactor is connected between the first input power and voltage transformation module, the coil of the first relay is connected between the first-phase and third phase of the first input power, and described first controls branch road comprises the coil of the first A.C. contactor between first-phase and the second-phase that is connected on the first input power, the normally closed auxiliary contact of often driving auxiliary contact and the second A.C. contactor of the first relay;
The second switch unit, comprise the second A.C. contactor, the second relay and the second control branch road, the main contact of described the second A.C. contactor is connected between the second input power and voltage transformation module, the coil of the second relay is connected between the first-phase and third phase of the second input power, and described second controls branch road comprises the coil of the second A.C. contactor between first-phase and the second-phase that is connected on the second input power, the normally closed auxiliary contact of often driving auxiliary contact and the first A.C. contactor of the second relay.
According in two-way switching controls power circuit of the present invention, the main contact of described the first A.C. contactor and the second A.C. contactor has mechanical interlock.
According in two-way switching controls power circuit of the present invention:
Described the first switch unit also comprises: be connected on the first circuit breaker between described the first input power and the main contact of described the first A.C. contactor;
Described the second switch unit also comprises: be connected on the second circuit breaker between described the second input power and the main contact of described the second A.C. contactor.
According in two-way switching controls power circuit of the present invention, described electrical source exchange module also comprises: be connected to the lightning protection Overvoltage protecting unit between output and the ground of electrical source exchange module.
According in two-way switching controls power circuit of the present invention, described voltage transformation module comprises: transformer, energy storage discharge cell and Switching Power Supply converting unit; The former limit of described transformer is connected with first-phase and the second-phase of the output of described electrical source exchange module, and the secondary of described transformer is exported the ac signal after step-down for the first time; Described energy storage discharge cell is for the ac signal after step-down being for the first time converted to high voltage direct current signal of telecommunication output, and energy storage electric discharge output during for dead electricity; Described Switching Power Supply converting unit is for carrying out providing Switching Power Supply signal to next stage circuit after step-down for the second time to the signal of energy storage discharge cell output.
Also comprising the 3rd circuit breaker between output and the described transformer primary side that is arranged on described electrical source exchange module according to voltage transformation module described in two-way switching controls power circuit of the present invention.
Comprising according to energy storage discharge cell described in two-way switching controls power circuit of the present invention: the first rectifier bridge, the second rectifier bridge, electrochemical capacitor and resistance; The input side of described the first rectifier bridge connects the secondary of described transformer, described electrochemical capacitor and resistance are connected between the positive output end and negative output terminal of described the first rectifier bridge, and the positive output end of described the first rectifier bridge and negative output terminal are connected to respectively positive output end and the negative output terminal of energy storage discharge cell; The input of described the second rectifier bridge connects the node between described electrochemical capacitor and resistance, and positive output end connects the positive output end of described energy storage discharge cell.
According in two-way switching controls power circuit of the present invention, described Switching Power Supply converting unit comprises: the first switching power circuit and second switch power circuit, and for providing double switch power supply signal to rear one-level circuit.
According in two-way switching controls power circuit of the present invention, described voltage transformation module also comprises: the filter unit between described transformer and energy storage discharge cell, comprises burst of pulses inhibitor and power-supply filter.
The present invention also provides a kind of high voltage converter, comprises foregoing two-way switching controls power circuit.
Implement two-way switching controls power circuit of the present invention and high voltage converter, there is following beneficial effect: the present invention completes electrical interlocks by the normally closed auxiliary contact of mutual string the other side in A.C. contactor control loop, realize phase shortage detection by setting up relay simultaneously, solved existing two-way switching controls power circuit especially high voltage converter can not effectively realize two-way switch, protection range is incomplete, the problem that system applies reliability is not high; In addition the present invention is also further by mechanical interlocked raising reliability, and provides pure, has the control power supply of short time power down memory function, can effectively improve the reliability of high voltage converter.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the module diagram of two-way switching controls power circuit according to the preferred embodiment of the invention;
Fig. 2 is circuit theory diagrams of electrical source exchange module in two-way switching controls power circuit according to the preferred embodiment of the invention;
Fig. 3 is circuit theory diagrams of voltage transformation module in two-way switching controls power circuit according to the preferred embodiment of the invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.
The invention provides a kind of two-way switching controls power circuit, reliable and stable two-way switching controls power circuit for especially a kind of high voltage converter.Referring to Fig. 1, is the module diagram of two-way switching controls power circuit according to the preferred embodiment of the invention.As shown in Figure 1, two-way switching controls power circuit provided by the invention comprises electrical source exchange module 100 and voltage transformation module 200.Wherein electrical source exchange module 100 is for switching between the first input power and the second input power, so that double loop power supply power supply to be provided.Voltage transformation module 200 is for input power being converted to required output voltage, is about to the first input power or the second input power and is converted to 24V direct voltage as 380V three-phase alternating voltage.
Incorporated by reference to consulting Fig. 2, be the circuit theory diagrams of electrical source exchange module in two-way switching controls power circuit according to the preferred embodiment of the invention.In the two-way switching controls power circuit that this embodiment provides, electrical source exchange module 100 at least comprises: the first switch unit 10 and the second switch unit 20.Wherein, the first switch unit 10 comprises that the first A.C. contactor KM1, the first relay K A1 and first control branch road.The main contact of the first A.C. contactor KM1, for often opening main contact, is connected between the first input power and voltage transformation module 200, on the main line between the input J1 of the first input power and the output J3 of electrical source exchange module.In Fig. 2, XT1 is binding post.The coil of the first relay K A1 is connected between the first-phase and third phase of the first input power, between A phase and C phase.First controls branch road comprises the coil of the first A.C. contactor KM1 of series connection, the normally closed auxiliary contact of often opening auxiliary contact and the second A.C. contactor KM2 of the first relay K A1.This first control branch road is connected between the first-phase and second-phase of the first input power, between A phase and B phase.And this first control branch road is positioned at the end of incoming cables of the main contact of the first A.C. contactor KM1.Correspondingly, the second switch unit 20 comprises that the second A.C. contactor KM2, the second relay K A2 and second control branch road.The main contact of the second A.C. contactor KM2, for often opening main contact, is connected between the second input power and voltage transformation module, on the main line between the input J2 of the second input power and the output J3 of electrical source exchange module.The coil of the second relay K A2 is connected between the first-phase and third phase of the second input power, between A phase and C phase.Second controls branch road comprises the coil of the second A.C. contactor KM2 of series connection, the normally closed auxiliary contact of often opening auxiliary contact and the first A.C. contactor KM1 of the second relay K A1.Second controls branch road is connected between the first-phase and second-phase of the second input power, between A phase and B phase.And this second control branch road is positioned at the end of incoming cables of the main contact of the second A.C. contactor KM2.
In this embodiment, first controls the normally closed auxiliary contact that is in series with the second A.C. contactor KM2 in branch road, and in the second control branch road, is in series with the normally closed auxiliary contact of the first A.C. contactor KM1, makes two switch units form electrical interlocks.
And, the first relay K A1 and the second relay K A2 detect as the power phase shortage of the first input power and the second input power respectively, as long as the first-phase of control power supply or third phase are as A phase and C phase phase shortage, the coil of the first relay K A1 or the second relay K A2 is without electricity, the coil of A.C. contactor is because the auxiliary contact of the relay of series connection is normally open, coil cannot be obtained electric, this road input power cannot normally be worked because of phase shortage dead electricity, automatically switches to another road input power.In addition, the coil of the first relay K A1 and the second relay K A2 is all connected between power supply first-phase and third phase as A phase and C phase, the coil of A.C. contactor is connected between the first-phase of power supply and second-phase as A and B phase, and both cooperations complete the power supply of two-way input power is detected.
In a preferred embodiment of the invention, the main contact of the first A.C. contactor KM1 and the second A.C. contactor KM2 also has mechanical interlock.This mechanical interlock can adopt any this area basic technology personnel to know and applicable mechanical structure that the main contact of two A.C. contactors is realized is mechanical interlocked.Mechanical interlock refers to by the structurally-fixed mode of two main contact switches of mechanical part correction two main contact switches can not be closed simultaneously, and as by mechanical lever, when a switch is closed, another switch is blocked and cannot close by machinery.In the time that the coil of one of them A.C. contactor powers on, its main contact closure, power supply input is controlled to rear class power supply in this road of conducting, and corresponding normally closed auxiliary contact will disconnect simultaneously, and then cause the coil of the other side's A.C. contactor not power on, make another road control dump power supply.Therefore, the present invention completes electrical interlocks by the normally closed auxiliary contact of mutual string the other side in A.C. contactor control loop, the main contact of two A.C. contactors is adopted to mechanical interlock simultaneously, even if ensure in the situation that electrical interlocks lost efficacy, also can realize the first A.C. contactor KM1 and the second A.C. contactor KM2 different time, close a floodgate, having solved in existing two-way switching controls power circuit especially two-way handoff functionality in high voltage converter can not effectively switch, the problem such as system applies reliability is not high.
In a preferred embodiment of the invention, two switch units also comprise respectively the circuit breaker as power supply deciliter and short-circuit protection effect.Wherein, the first switch unit 10 comprises the first circuit breaker Q F1, and it is connected between the first input power and the main contact of the first A.C. contactor KM1.The second switch unit 20 comprises the second circuit breaker Q F2, and it is connected between the second input power J2 and the main contact of the second A.C. contactor KM2.The first circuit breaker Q F1 and the second circuit breaker Q F2, respectively as the control master switch of the first input power and the second input power.
As depicted in figs. 1 and 2; in this two-way switching controls power circuit, electrical source exchange module 100 also comprises lightning protection Overvoltage protecting unit 30; it is connected between the output J3 and ground of electrical source exchange module 100; adopt for example lightning protection overvoltage protector F2 to realize, to realize the function of lightning-arrest and overvoltage protection.
Referring to Fig. 3, is the circuit theory diagrams of voltage transformation module in two-way switching controls power circuit according to the preferred embodiment of the invention.As shown in figures 1 and 3, this voltage transformation module 200 at least comprises: transformer T1, energy storage discharge cell 40 and Switching Power Supply converting unit 60.
Wherein, the first-phase of the former limit of transformer T1 and the output J3 of electrical source exchange module 100 and second-phase are connected with B as A phase, and the secondary of transformer T1 is exported the ac signal after step-down for the first time.Transformer T1 is that input voltage value is adjustable, and output voltage is the insulate step-down transformer that 220V exchanges, and main once conversion, electrical safety isolation and the High-frequency Interference that realizes control power supply suppresses.Between the former limit of transformer T1 and the output J3 of electrical source exchange module 100, the 3rd circuit breaker Q F3 can also be set, control master switch and the short-circuit protection exported to voltage transformation module 200 as electrical source exchange module 100.The secondary of transformer T1 can also be set up the first fuse FU1, for short circuit and the long-term overload protection of transformer.
Energy storage discharge cell 50 is for the ac signal after step-down being for the first time converted to high voltage direct current signal of telecommunication output, and energy storage electric discharge output during for dead electricity.Energy storage discharge cell 50 comprises: the first rectifier bridge U1, the second rectifier bridge U2, electrochemical capacitor C1 and resistance R 1.The secondary of the input side connection transformer T1 of the first rectifier bridge U1, be connected between the positive output end and negative output terminal of the first rectifier bridge U1, and two ends is connected to respectively positive output end and the negative output terminal of energy storage discharge cell 50 after electrochemical capacitor C1 and resistance R 1 series connection.The input of the second rectifier bridge U2 connects the node between electrochemical capacitor C1 and resistance R 1, and positive output end connects the positive output end of energy storage discharge cell 50.Energy storage discharge cell 50 can be converted to 220V AC power 310V DC power supply, and by electrochemical capacitor C1, electric energy is stored in right amount, process operation to meet in the two-way control power supply dead electricity situation of input urgent storage data etc., and in the time discharging, resistance R 1 is carried out to bypass by the second rectifier bridge U2, and then reduced loss.
Switching Power Supply converting unit 60 carries out providing Switching Power Supply to next stage circuit after step-down for the second time for the signal that energy storage discharge cell 50 is exported.For example, 310V DC power supply is converted to 24V DC power supply.This Switching Power Supply converting unit 60 further comprises: the first switching power circuit and second switch power circuit.The first switching power circuit comprises the first switching power source chip PSU1 and peripheral circuit, for first via Switching Power Supply signal is provided as control system main power supply, as: man-machine interface (HMI), control board etc.Second switch power circuit comprises second switch power supply chip PSU2 and peripheral circuit, for providing the second way switch power supply signal as external control signal main power supply, as: auxiliary relay, programmable logic controller (PLC) (PLC), user I/O etc.In a preferred embodiment of the invention; the second fuse FU2 and the 3rd fuse FU3 can also connect on the outlet line of the first switching power circuit and second switch power circuit; mainly realize the over load protection of two-way output switch power source signal, guarantee the reliability of system power supply.
In a preferred embodiment of the invention, this voltage transformation module 200 also comprises the filter unit 40 between transformer T1 and energy storage discharge cell 50.This filter unit 40 can comprise burst of pulses inhibitor Z1 and power-supply filter Z2, and for carrying out high frequency and low frequency filtering, its frequency bandwidth can suitably be adjusted as required.Through burst of pulses inhibitor Z1 and power-supply filter Z2 for example overall package in accumulation power supply case.The power supply of transformer T1 conversion output will provide the power supply that late-class circuit is pure after burst of pulses inhibitor Z1 and power-supply filter Z2 filtering processing, and this power supply can meet GB completely to controlling relevant Electro Magnetic Compatibility (EMC) test requirements document of power supply.The present invention has also set up the 3rd relay K A3 before filtering, its coil is connected between the secondary output of transformer T1, locate as the power supply before filtering being detected and feedback point being caused to internal digital input (DI), the state of often opening auxiliary contact according to the 3rd relay K A3 can effectively judge whether control power supply exists extremely, so that system judges next step operation.
The present invention is also corresponding provides a kind of high voltage converter, and it comprises aforesaid two-way switching controls power circuit.Its first input power is controlled power supply input from user 380V, and the second input power is exported from high pressure phase shifting transformer secondary.And the control system main power supply that the two-way switching controls power circuit of high voltage converter can be used as high voltage converter provides first via Switching Power Supply signal, as: man-machine interface (HMI), control board etc., provide the second way switch power supply signal as the external control signal main power supply of high voltage converter simultaneously, as: auxiliary relay, programmable logic controller (PLC) (PLC), user I/O etc.
The present invention by electrical interlocks and phase shortage detect solved two-way switching controls power circuit especially in high voltage converter two-way handoff functionality can not effectively switch, the problem such as protection range is incomplete, and system applies reliability is not high.The main contact of two A.C. contactors is adopted to mechanical interlock simultaneously, even if ensure in the situation that electrical interlocks lost efficacy, also can realize two A.C. contactors differences time, close a floodgate, further improved the reliability that two-way switches.Meanwhile, also further realize the special processing of plate level power supply: Isolation, isolation, making finally to provide the power supply of system is pure power supply; Also further realize plate level and supplied the unexpected power supply capacity of electrical short: possessed stored energy and discharge loop, the operations such as effective support data preservation in particular cases; Also realize same classification power supply and protection for electrical specification simultaneously, reduced the core loss of power causing because of the wrong line of user or the reason such as aging.
The present invention is described according to specific embodiment, but it will be understood by those skilled in the art that in the time not departing from the scope of the invention, can carry out various variations and be equal to replacement.In addition,, for adapting to specific occasion or the material of the technology of the present invention, can carry out many amendments and not depart from its protection range the present invention.Therefore, the present invention is not limited to specific embodiment disclosed herein, and comprises all embodiment that drop into claim protection range.
Claims (10)
1. a two-way switching controls power circuit, comprise the electrical source exchange module of switching between the first input power and the second input power, and for input power being converted to the voltage transformation module of required output voltage, it is characterized in that, described electrical source exchange module comprises:
The first switch unit, comprise the first A.C. contactor, the first relay and the first control branch road, the main contact of described the first A.C. contactor is connected between the first input power and voltage transformation module, the coil of the first relay is connected between the first-phase and third phase of the first input power, and described first controls branch road comprises the coil of the first A.C. contactor between first-phase and the second-phase that is connected on the first input power, the normally closed auxiliary contact of often driving auxiliary contact and the second A.C. contactor of the first relay;
The second switch unit, comprise the second A.C. contactor, the second relay and the second control branch road, the main contact of described the second A.C. contactor is connected between the second input power and voltage transformation module, the coil of the second relay is connected between the first-phase and third phase of the second input power, and described second controls branch road comprises the coil of the second A.C. contactor between first-phase and the second-phase that is connected on the second input power, the normally closed auxiliary contact of often driving auxiliary contact and the first A.C. contactor of the second relay.
2. two-way switching controls power circuit according to claim 1, is characterized in that, the main contact of described the first A.C. contactor and the second A.C. contactor has mechanical interlock.
3. two-way switching controls power circuit according to claim 1, is characterized in that:
Described the first switch unit also comprises: be connected on the first circuit breaker between described the first input power and the main contact of described the first A.C. contactor;
Described the second switch unit also comprises: be connected on the second circuit breaker between described the second input power and the main contact of described the second A.C. contactor.
4. two-way switching controls power circuit according to claim 1, is characterized in that, described electrical source exchange module also comprises: be connected to the lightning protection Overvoltage protecting unit between output and the ground of electrical source exchange module.
5. according to the two-way switching controls power circuit described in any one in claim 1-4, it is characterized in that, described voltage transformation module comprises: transformer, energy storage discharge cell and Switching Power Supply converting unit;
The former limit of described transformer is connected with first-phase and the second-phase of the output of electrical source exchange module, and the secondary of described transformer is exported the ac signal after step-down for the first time;
Described energy storage discharge cell is for the ac signal after step-down being for the first time converted to high voltage direct current signal of telecommunication output, and energy storage electric discharge output during for dead electricity;
Described Switching Power Supply converting unit is for carrying out providing Switching Power Supply signal to next stage circuit after step-down for the second time to the signal of energy storage discharge cell output.
6. two-way switching controls power circuit according to claim 5, is characterized in that, described voltage transformation module also comprises the 3rd circuit breaker between output and the described transformer primary side that is arranged on described electrical source exchange module.
7. two-way switching controls power circuit according to claim 5, is characterized in that, described energy storage discharge cell comprises: the first rectifier bridge, the second rectifier bridge, electrochemical capacitor and resistance;
The input side of described the first rectifier bridge connects the secondary of described transformer, described electrochemical capacitor and resistance are connected between the positive output end and negative output terminal of described the first rectifier bridge, and the positive output end of described the first rectifier bridge and negative output terminal are connected to respectively positive output end and the negative output terminal of energy storage discharge cell; The input of described the second rectifier bridge connects the node between described electrochemical capacitor and resistance, and positive output end connects the positive output end of described energy storage discharge cell.
8. two-way switching controls power circuit according to claim 5, is characterized in that, described Switching Power Supply converting unit comprises: the first switching power circuit and second switch power circuit, and for providing double switch power supply signal to rear one-level circuit.
9. two-way switching controls power circuit according to claim 5, is characterized in that, described voltage transformation module also comprises: the filter unit between described transformer and energy storage discharge cell.
10. a high voltage converter, is characterized in that, comprises the two-way switching controls power circuit described in any one in claim 1-9.
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