CN103298224A - Control circuit for high intensity discharge lamp - Google Patents

Abstract

The invention discloses a control circuit for a high intensity discharge (HID) lamp, mainly used for lamp load. The circuit comprises a transformer with a plurality of taps on a secondary side, a plurality of contactors for connecting the output and transformer taps, a plurality of switches, and a PLC controller for controlling the contactors and the switches according to a principle of optimal power output. The control circuit can increase utilization rate of the HID lamp to electric energy, prolong the service life of the lamp and reduce maintenance cost of the lamp.

Description

The control circuit of high-pressure discharge lamp

Technical field

The present invention relates to a kind of control circuit of high-pressure discharge lamp, the present invention is used for voltage and the power of control illumination class load, for example: high-pressure discharge lamp (High Intensity Discharge Lamps-HID).

Background technology

HID comprises: metal halide lamp, mercury lamp, high-pressure sodium lamp and low-pressure sodium lamp.The main floodlighting that is applied to, for example stadium lighting, street lighting, and similar illumination occasion etc.This invention can improve the HID lamp to the utilance of electric energy, improves the useful life of light fixture, the maintenance cost of reduction light fixture.

Summary of the invention

The present invention has designed a kind of new drive circuit, is used for the load of HID lamp one class.This circuit comprises that a secondary has the transformer of a plurality of taps; A plurality of contactors are used for connecting transformer tapping and load.Master controller adopts Programmable Logic Controller (PLC), according to the break-make of power optimized principle control contactor.

Below describe for the patent characteristics:

1, contactor adopts series system, is used for connecting the different tap of transformer output and load, realizes step-down.

2, transformer is for having neutral point tap polyphase transformer, and same coil is used with secondary the change in the former limit of this transformer.By selecting the secondary different taps that become, realize above-mentioned power optimized control strategy.

3, one of them contactor is used for the bypass line voltage, when system breaks down, connects when perhaps system need be output as maximum power.

4, transformer is connecting protection system, and for example MCB and maximum point contactor are used for the output of control maximum power.

5, Zhuan Yong bypass contactor is used for the short circuit voltage transformer system, makes light fixture directly insert electrical network, illuminator operate as normal when guaranteeing the system failure.

6, a plurality of contactors are used for connecting output step-down tap and the load of transformer.Corresponding different step-down grade respectively.

7, controller can be realized clocking capability and timing control switch function.

8, master controller adopts Programmable Logic Controller (PLC), is used for the automatic control system operation.

9, controller can connect outside Light indicator, realizes automatic light regulatory function.

10, system comprises a single-phase transformer for powering to control system.

11, each the step-down contactor that is used in the system comprises the back electromotive force that an auxiliary contactor is used for preventing transformer.

12, the transformer in the system is autotransformer, only comprises a coil and an iron core.Transformer in the system is dry-type transformer.

Description of drawings

Describe exemplary embodiment of the present invention in more detail by the reference accompanying drawing, above and other aspect of the present invention and advantage will become and be readily clear of more, in the accompanying drawings:

Fig. 1 is the on-link mode (OLM) schematic diagram of control system and light fixture and electrical network.

Fig. 2 is control system internal links figure schematic diagram.

Figure 3 shows that contactor on-link mode (OLM) schematic diagram.

Figure 4 shows that internal links mode schematic diagram.

Fig. 5 is transformer internal structure schematic diagram;

Fig. 6 is transformer coil linked, diagram schematic diagram;

Fig. 7 is transformer principle explanation schematic diagram;

Embodiment

In order better to understand this control system, below in conjunction with its course of work of graphic rendition.

As shown in Figure 1, control system is linked to the three-phase three-wire system electrical network through inlet wire L1, L2, L3 end, through giving control system behind current transformer and the fuse.Process line T1, T2, the T3 of the other end of controller behind overcurrent fuse is linked to the HID lamp load.This control system can be controlled the voltage and current that is input to the HID lamp load.Simultaneity factor can the bypass line voltage, for the user provides different energy-saving modes.And normal operation that can proof load when control system breaks down.

The transformer of system is the dry-type transformer of Y-connection, and the transformer secondary has a plurality of taps, and being used for provides different electric pressures to load, thereby different energy-saving modes can be arranged.The primary coil of this transformer and secondary coil are same coil, and use same iron core.The energy-saving efficiency of system is to select according to different application scenarios, and purpose is optimum power output.Controller adopts PLC, and the different electric pressures of exporting by control transformer provide different energy saver modes to load.Control system can automatically switch between different energy saver modes.This system is by the contactor control output voltage of series connection.Auxiliary contactor is used for preventing inverse electromotive force.Control system is controlled the voltage and current that is input to the HID lamp by a series of contactor and auxiliary contactor, and also there is the function that suppresses the transformer inverse electromotive force in this system.

Fig. 2 has provided the concrete mode of internal system wiring.Input line L1, L2, L3 enter the transformer contactor after by circuit breaker.Transformer contactor and 400V contactor provide a bypass functionality for system together.This part can eliminate of short duration line voltage spike.Transformer is the dry-type transformer that only contains the automatic control of coil of an iron core, a plurality of secondary taps.Each primary coil of transformer is connected to different contactors.

Figure 3 shows that how switching mechanism realizes four energy saver mode A, B, C and D, and the on-link mode (OLM) of four auxiliary contactors.Power supply is given 20,21,22,23,24 power supplies by switch 13.Four switches can reduce output voltage as shown in Figure 3, and different mode of operations has different output voltages.Three switches shown in 13 are positioned at above the MCB, are three switches of protection usefulness.Single-phase transformer 21 is powered by switch 13, and is timer 20, relay 22, on-off switch 23 and 24 power supplies of 4 step switches.

Figure 4 shows that the on-link mode (OLM) between control switch, single-phase transformer, relay and the by-pass switch.Line voltage is given transformer-supplied by line L1, L2, L3, circuit breaker.The tap of transformer is (11), and every phase of transformer has 10 secondary taps.Except bypass voltage, only need be combined into three outer taps and get final product.Switch 24 is used for opening and turn-offing of control bypass voltage.Also marked the on-link mode (OLM) between timer, relay and the transformer among the figure.A series of contactors (12) are used for connecting different transformer tappings, export different electric pressures.

Fig. 2,3,4 has provided the internal links details.This system can accurately obtain required electric pressure at output, and the concrete on-link mode (OLM) of transformer is shown in Fig. 5,6,7.

Comprise 20, one single-phase transformers 21 of a timer, a relay 22, a by-pass switch 23, four step switches 24 in this system.Switch 23 provides the safe mode after a kind of fault, is used for the bypass functionality of control system, and this bypass functionality can run on manually and automatic mode.

Operational mode

Close when being in the position of on when opening 23, system is from the supply voltage step-down of 400V.The output voltage of this moment depends on position (0,1,2,3) and each contactor A of switch 24, B, and C, the state of D, this output voltage have also just determined different energy saver modes.Position 0 corresponding grade A, position 1 corresponding grade B.

Auxiliary contactor is used for stoping reverse voltage.In order to prevent a plurality of contactors connecting system simultaneously, control is when contactor B disconnects, contactor C connecting system.Here do not comprise that the inverse electromotive force of transformer is to the protection of the contactor of disconnection.This protection scheme is the Y-connection coil that utilizes transformer, and coil is used for former limit and secondary simultaneously.When system voltage fluctuateed, this control circuit can be exported a voltage more stably by control transformer, the protection light fixture.

Control system can be controlled the voltage that electrical network is injected into the HID lamp, electrical network can be single-phase also can be three-phase.Its core is a dry type autotransformer.Voltage by control HID lamp can make the operational efficiency of light fixture higher, saves energy, minimizing emission of carbon-dioxide.HID comprises: metal halide lamp, mercury lamp, high-pressure sodium lamp and low-pressure sodium lamp.This invention can be used for other floodlightings equally, as T12 and T8 etc.

Line voltage fluctuates with+/-10 amplitude on the basis of rated voltage.In order to address this problem, control will be with the voltage control of HID lamp in most effective electric pressure, and this electric pressure is that HID lamp manufacturer provides, and different manufacturer is all different with dissimilar lamp optimal voltages.Main contactor A, B, C and D can reduce electric industry and electric current simultaneously.

Some local government and some mechanism are for saves energy and reduce CO2 emissions, often use the mode of power cuts to limit consumption.Adopt this invention to address this problem, in saves energy and CO2 emission, guarantee user's illumination, the highest can energy-conservation 35%.

The lumen phenomenon can appear in the occasion for some floodlighting, namely occurs the too high point of brightness in the field of illumination.This control system can suppress the overcurrent condition of understanding, and control reaches an acceptable illuminating effect in the field of illumination of integral body.For example the stadium of rugby requires according to European relevant departments regulation: the illumination of hockey field is 500 Ke Lesi, and the illumination in football pitch is in 250 luxs.The illuminance that the present invention just can control light is switched between 250 Ke Lesi and 500 Ke Lesi, uses this equipment just can hold different races in same place.

The present invention and installing easily only needs the series connection line attachment to get final product, and does not require original track remodelling and volume lessly, and great capacity (kVA) all need not to change existing equipment.An equipment can be controlled a plurality of street lamps, and for example 150 250 watts lamp gets final product with a 50kVA equipment.Energy-saving effect is near 35%, and be 2 two years the payoff period that equipment drops into.This equipment can also be used for multiple electric power application scenario, for example motor load such as refrigerator, air-conditioning situation except being used for lighting field.

Claims (14)

1. the control circuit of a high-pressure discharge lamp is mainly used in the lamp ﹠ lantern load, it is characterized in that: this circuit: the transformer that comprises a plurality of taps of subcarrier band; A plurality of contactors are used for connecting output and transformer tapping; A plurality of switches; A PLC controller is arranged each contactor and switch motion according to the principle of power output optimum.

2. control circuit according to claim 1 wherein, has a plurality of contactors to connect successively in this circuit, and each contactor can be exported the electric pressure of a step-down.

3. control circuit according to claim 2 wherein, has polyphase transformer that has the neutral point tap in this circuit, and the coil of each transformer is primary coil and secondary coil simultaneously.

4. according to the described control circuit of claim 1-3, wherein, a contactor bypath system voltage is arranged in this circuit, be used for output maximum voltage grade.

5. control circuit according to claim 4, wherein, transformer contactor in this circuit, an end connect protection system as MCB, other end link maximum power contactor, are used for Maximum Power Output.

6. control circuit according to claim 5 wherein, has the by-pass switch of a particular design in this circuit, is used for Maximum Power Output, and when system broke down, system ran on mains voltage maximum.

7. according to any described control circuit of aforementioned claim, wherein, the switch that includes a plurality of multiports in this circuit is used for connecting the tap of transformer and the contactor output that step-down is used, and each step-down contactor also is connected in the step-down tap of transformer.

8. according to any described control circuit of aforementioned claim, wherein, comprise PLC in the controller and be used for the automatic control switch action.

9. according to any described control circuit of aforementioned claim, wherein, include timer in the controller, be used for timing switch.

10. according to any described control circuit of aforementioned claim, wherein, the PLC in the controller can be by the Light indicator control of outside.

11. according to any described control circuit of aforementioned claim, wherein, comprise a single-phase transformer in the control system, be used for powering to control system.

12. according to any described control circuit of aforementioned claim, wherein, the contactor that each step-down is used in the circuit has an auxiliary contactor to be used for the inverse electromotive force of control reverse voltage and transformer.

13. according to any described control circuit of aforementioned claim, wherein, transformer adopting be autotransformer, primary coil and secondary line are same coil, and this coil uses same iron core.

14. control circuit according to claim 13, wherein, the transformer in the circuit is dry-type transformer.

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