CN202142986U - Energy-saving electronic transformer - Google Patents
Energy-saving electronic transformer Download PDFInfo
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- CN202142986U CN202142986U CN201120255579U CN201120255579U CN202142986U CN 202142986 U CN202142986 U CN 202142986U CN 201120255579 U CN201120255579 U CN 201120255579U CN 201120255579 U CN201120255579 U CN 201120255579U CN 202142986 U CN202142986 U CN 202142986U
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Abstract
The utility model discloses an energy-saving electronic transformer comprising a power module, an external electric supply, a transformation module and a control module, wherein the power module transforms the electric supply into a direct current drive electrical signal and an alternating current control electrical signal required by the transformer and outputs the direct current drive electrical signal and the alternating current control electrical signal; the transformation module transforms the direct current drive electrical signal output by the power module into a high-power high-frequency square wave alternating current electrical signal required by driving an exposing lamp; and the control module including a PWM (pulse width modulation) control unit controls the transformation module to perform transformation action and performs overcurrent protection and thermal protection for the transformation module. Compared with a leakage transformer, the energy-saving transformer has the advantages of accurately controlling duty cycle, regulating the output voltage, improving the voltage stabilizing accuracy, and significantly reducing the energy consumption required by driving the exposing lamp.
Description
Technical field
The utility model relates to a kind of energy-saving electric transformer, particularly a kind of energy-saving electric transformer and method of operation thereof that is used for high-power PCB Exposing Lamp.
Background technology
The existing PCB Exposing Lamp power supply that uses all is to adopt the leakage transformer power supply.Leakage transformer belongs to the boost category of dry-type transformer of leakage field, is used for the electronic equipment that load sharply changes and require the state that progressively tends towards stability, like equipment such as Exposing Lamp power supplys.It is bigger that this type load shows as when starting working impedance, needs higher transient voltage; And when steady operation, load impedance is less, needs load current limit in permissible value, so that it can operate as normal.
But this leakage transformer is slow owing to response speed, precision is not high enough, and receives the influence of power-supply fluctuation and load equipment electrical characteristic bigger in the work, can cause unnecessary energy consumption.
The utility model content
The utility model is in order to overcome above-mentioned defective of the prior art, the high-power PCB Exposing Lamp energy-saving electric transformer of a kind of employing pulse-width modulation (PWM) technology to be provided.Compare with leakage transformer, this energy-saving electric transformer can accurately be controlled duty ratio, regulates the voltage of output, improves the precision of voltage regulation, reduces significantly to drive the required energy consumption of Exposing Lamp.
For realizing above-mentioned purpose, the utility model provides following technical scheme:
This energy-saving electric transformer comprises: power module, and external civil power, and civil power converted into the required DC driven signal of telecommunication of transformer and exchange control signal of telecommunication output; The transformation module, the DC driven electrical signal conversion that said power module is exported is the required high-power high-frequency square wave alternating-current signal of telecommunication of driving Exposing Lamp; And control module, comprise pulse-width modulation (PWM) control unit, control said transformation module according to the pulse modulation technology principle and carry out the transformation action, and said transformation module is carried out overcurrent protection and overtemperature protection.
Further, said power module comprises filter, accessory power supply, rectification unit and filter unit, and wherein: said filter comprises the filter capacitor of three Y-connections, and this filter external 380V AC power frequency civil power also carries out filtering; Said accessory power supply is a transformer, and its former limit is connected on two phase lines of said filter, and its secondary provides the control signal of telecommunication to said control module; Said rectification unit is a bridge rectifier, and the three-phase alternating current electrical signal conversion that said filter is exported is a dc signal; Said filter unit is the RC filter circuit, and the dc signal that said rectification unit is exported carries out filtering.
Further, said filter unit comprises: be serially connected in first electric capacity and second electric capacity between two outputs of said rectification unit, the common end grounding of these two electric capacity; The 3rd electric capacity between two output that are connected on said rectification unit; First resistance parallelly connected with above-mentioned the 3rd electric capacity; And, be connected on the 4th electric capacity and the 5th electric capacity between two outputs of said rectification unit.
Further, said transformation module comprises inversion unit, boosting unit and ballast filter unit; Wherein, said inversion unit receives the DC driven signal of telecommunication of said power module output, and under the control of said PWM control unit, is the ac square-wave voltage signal with this DC driven electrical signal conversion; Said boosting unit is a high frequency transformer, and the ac square-wave voltage signal that said inversion unit is exported boosts; Said ballast filter unit carries out the ballast Filtering Processing to the signal of telecommunication of said boosting unit output, and the signal of telecommunication after will handling is exported to and used electric loading.
Further; Said inversion unit is a half bridge inverter circuit; One of them brachium pontis is composed in series by first switching tube and second switch pipe; Said first switch and second switch all are insulated gate bipolar transistor (IGBT) modules that power is not less than 5KW, and the emitter of said first switching tube is connected with the collector electrode of said second switch pipe; Another brachium pontis is connected successively by the 4th resistance, the 6th electric capacity, the 5th resistance and the 7th electric capacity and is formed, and the other end of the 4th resistance is connected with the collector electrode of said first switching tube, and the other end of the 7th electric capacity is connected with the emitter of said second switch pipe; And the grid of said first switch is in series with second resistance, and the emitter of the other end of this second resistance and said first switch is connected on the said PWM control unit; The grid of said second switch is in series with the 3rd resistance, and the other end of the 3rd resistance and the emitter of said second switch are connected on the said PWM control unit.
Further; One end on the former limit of said high frequency transformer both had been connected on the common port of the 5th resistance and the 6th electric capacity; Be connected the common port of first switching tube and second switch pipe again, the other end on the former limit of said high frequency transformer then is connected the common port of the 4th electric capacity and the 5th electric capacity.
Further, said ballast filter unit comprises respectively first inductance that two electric capacity of two-way output the carrying out filtering of said boosting unit and output loop to said boosting unit is carried out ballast.
Further, said control module also comprises a detecting unit, detects the size of current in the output loop of said transformation module, and the corresponding detection signal of output is given said PWM control unit; An overheated detecting unit detects the size of current in the input circuit of said transformation module, and the corresponding detection signal of output is given said PWM control unit; And, when said PWM control unit surpasses certain threshold value at the detection signal of said detecting unit, adjust said transformation module and reduce the pulse duration duty ratio; When said PWM control unit surpasses certain threshold value at the detection signal of said overheated detecting unit, cut off the voltage output of said transformation module.
Further, the control core of said PWM control unit is the SG3525 chip, is connected with full merit/half merit change over switch, some lamp switch, power supply indicator, malfunction indicator lamp, voltmeter and ammeter on this pulse width modulation controlled unit; Wherein, said full merit/half merit change over switch is controlled the output signal of said SG3525 chip to said transformation module duty ratio; Said some lamp switch controlled the output signal that said transformation module outputting drive voltage was opened/turn-offed to said SG3525 chip; Said power supply indicator is lighted when said PWM control unit is in "on" position; Said malfunction indicator lamp is lighted when said PWM control unit is in malfunction; The output voltage values of said voltmeter indicating operating status; The output current value of said ammeter indicating operating status.
A kind of method of operation of operating said energy-saving electric transformer comprises the steps:
1) opens the power of transformer switch;
2) power output of adjustment transformer is the half the of rated value;
3) open the switch of Exposing Lamp;
4) after the output current of treating transformer rises to rated current, the power output of transformer is adjusted to the quota of rated value.
Compared with prior art, the utlity model has following beneficial effect:
1, adopted SG3525 chip with pulse-width modulation (PWM) function core as control unit; Can adjust the output voltage of transformer according to detected feedback signal quickly and accurately; Its precision of voltage regulation is high, and 10% power supply voltage variation can not produce any influence for the power supply with electric loading;
2, select high-power IGBT for use, promptly power is the above IGBT of 5KW, as the switching tube of half bridge inverter circuit, has that drive circuit is simple, driving power is little, switching speed reaches advantages such as the safety operation area is big soon;
3, the crest voltage that when off-state, bears of two IGBT switching tubes in the half bridge inverter circuit is input voltage; Because acting on of electric capacity at a distance from straight; Half bridge inverter circuit has the autobalance effect to the DC component owing to two asymmetric transformer original edge voltages that cause of switching tube ON time; Be difficult for transformer bias and the magnetically saturated problem of direct current take place, need not add capacitance in addition, can simplify circuit;
4, the former limit parallel resistor of high frequency transformer and electric capacity are formed RC and are absorbed circuit, can the absorbing high-frequency spike;
The inductor of 5, connecting with the exposure fluorescent tube can filter the standing wave that fluorescent tube produces;
6, because selected elements such as volume is little, function is strong, precision is high SG3525 chip, I GBT switching tube for use; And to these yuan piece optimization circuit; So the overall volume of this energy-saving electric transformer and weight are all less than the leakage transformer of same specification; And that its energy-saving effect improves is about 40%, receives the light wave intensity of the Exposing Lamp that this transformer drives then to improve about 5%, life-span and improves at least 20%;
7, the output voltage with high frequency transformer drives load, can higher transient voltage be provided in the moment that loads, and plays and the akin output effect of traditional leakage transformer, is highly suitable for driving the equipment of one type of Exposing Lamp.
Description of drawings
Fig. 1 is the theory diagram of embodiment one energy-saving electric transformer;
Fig. 2 is the circuit diagram of embodiment one energy-saving electric transformer;
Fig. 3 is the casing front view of embodiment one energy-saving electric transformer;
Fig. 4 is the casing rear view of embodiment one energy-saving electric transformer;
Fig. 5 is the flow chart of embodiment one energy-saving electric transformer.
Blocks tag definitions among Fig. 2 is following:
The 1-filter, 2-accessory power supply, 3-rectification unit, 4-filter unit, 5-inversion unit, 6-boosting unit, 7-ballast filter unit, 8-detecting unit, 9-PWM control unit, the overheated detecting unit of 10-.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiment of the utility model is described in detail, but the protection range that is to be understood that the utility model does not receive the restriction of embodiment.
Embodiment one
A kind of energy-saving electric transformer comprises: power module is used for external civil power, and civil power is converted into the required DC driven signal of telecommunication of transformer and exchanges the output of the control signal of telecommunication; The transformation module, the DC driven electrical signal conversion that said power module is exported is the required high-power high-frequency square wave alternating-current signal of telecommunication of driving Exposing Lamp; And control module, comprise that the control core is the pulse width modulation controlled unit of SG3525 chip, control said transformation module according to pulse-width modulation (PWM) know-why and carry out the transformation action, and said transformation module is carried out overcurrent protection and overtemperature protection.
Particularly; As illustrated in fig. 1 and 2; Said pulse width modulation controlled unit is a PWM control unit 9; Said power module comprises filter 1, accessory power supply 2, rectification unit 3 and filter unit 4, and wherein: said filter 1 comprises filter capacitor and three phase line A, B, the C of three Y-connections, and this filter 1 external 380V AC power frequency civil power also carries out filtering; Said accessory power supply 2 is a transformer BT1, and its former limit is connected on two phase lines of B, C of said filter 1, and its secondary provides the control signal of telecommunication to said PWM control unit 9; Said rectification unit 3 is a bridge rectifier, and the three-phase alternating current electrical signal conversion that said filter 1 is exported is a dc signal; Said filter unit 4 is the RC filter circuit, and the dc signal that said rectification unit 3 is exported carries out filtering.Said filter unit 4 comprises: be serially connected in first capacitor C 1 and second capacitor C 2 between two outputs of said rectification unit 3, the common end grounding of C1 and C2; The 3rd capacitor C 3 between two output that are connected on said rectification unit 3; First resistance R 1 parallelly connected with C3; And, be connected on the 4th capacitor C 4 and the 5th capacitor C 5 between two outputs of said rectification unit 3.This RC filter circuit can absorb the high frequency spike in the circuit, the stability of intensifier circuit.
Said transformation module comprises inversion unit 5, boosting unit 6 and ballast filter unit 7; Wherein, said inversion unit 5 receives from the DC driven signal of telecommunication of said filter unit 4 outputs, and under the control of said PWM control unit 9, is the ac square-wave voltage signal with this DC driven electrical signal conversion; Said boosting unit 6 is high frequency transformer T1, and the ac square-wave voltage signal that said inversion unit 5 is exported boosts; The signal of telecommunication of 7 pairs of T1 outputs of said ballast filter unit carries out the ballast Filtering Processing, and the signal of telecommunication after will handling is exported to the exposure fluorescent tube or other use electric loading.Said inversion unit 5 is half bridge inverter circuits, and one of them brachium pontis is composed in series by the first switching tube Q1 and second switch pipe Q2, and Q1 and Q2 all are IGBT modules that power is not less than 5KW, and the emitter of Q1 is connected with the collector electrode of Q2; Another brachium pontis is connected successively by the 4th resistance R 4, the 6th capacitor C 6, the 5th resistance R 5 and the 7th capacitor C 7 and is formed, and the other end of R4 is connected with the collector electrode of Q1, and the other end of C7 is connected with the emitter of Q2; And the grid of Q1 is in series with second resistance R 2, and the other end of R2 and the emitter of Q1 are connected on the said SG3525 chip; The grid of Q2 is in series with the 3rd resistance R 3, and the other end of R3 and the emitter of Q2 are connected on the SG3525 chip.One end on the former limit of T1 both had been connected on the common port of R5 and C6, was connected again on the common port of Q1 and Q2, and the other end on the former limit of T1 then is connected the common port of C4 and C5.It is half ac square-wave voltage of the former limit of T1 input voltage that the direct voltage that the voltage of Q1 and Q2 mid point equals to export after rectification unit 3 rectifications half the, Q1, Q2 alternate conduction just form amplitude at the secondary of T1.Through SG 3525 chip controls Q1 and the Q2 conducting separately and the time ratio of shutoff, i.e. duty ratio just can change the average voltage of the secondary output of T1 easily.In this example, Q1 and Q2 can output frequency be the high frequency square wave alternating current of 20KHz under the control of SG3525 chip.If Q1 and Q2 do not produce the interactive action of conducting/shutoff, then former limit one side of T1 can not produce alternating voltage, thereby can not produce voltage output in secondary one side of T1.The crest voltage that Q1 and Q2 bear when off-state is the former limit input voltage of T1; Because acting on of electric capacity at a distance from straight; Half bridge inverter circuit has the autobalance effect to the DC component owing to Q1 and the asymmetric transformer original edge voltage that causes of Q2 ON time; Be difficult for transformer bias and the magnetically saturated problem of direct current take place, need not add capacitance in addition, can simplify circuit.
Said ballast filter unit 7 comprises respectively first inductance L 1 of two capacitor C 8 of two-way output the carrying out filtering of T1, C9 and output loop to T1 being carried out ballast; One of C8 terminates on the output of T1, and the other end and C9 join, and the common end grounding of C8 and C9, the other end of C9 are connected on another output of T1.During work, L1 and Exposing Lamp pipe form series circuit, thereby can filter the standing wave that fluorescent tube produces, avoid standing wave cause electric arc in the fluorescent tube shakiness, glimmer or extinguish, thereby protection bulb and ballasting circuit are unlikely to overheated.After ballast filtering, can obtain stable output voltage between the above-mentioned two-way output.Through selecting the specification of T1 and IGBT module Q1, Q2, under the adjustment of PWM control unit, can this output voltage be adjusted to the numerical value of needs, the 550V of the fluorescent tube that for example is usually used in making public.If load equipment has other requirements to the height of voltage; Both can realize adjustment through the control signal of regulating 9 couples of Q1 of PWM control unit and Q2 to output voltage; Also can realize adjustment, can also these two kinds of means be used in combination and adjust output voltage through the T1 that selects appropriate size for use to output voltage.
Said control module also comprises a detecting unit 8, the size of current in the output loop of detection T1, and the corresponding detection signal of output is given said PWM control unit 9; An overheated detecting unit 10, the size of current in the input circuit of detection T1, and the corresponding detection signal of output is given said PWM control unit 9; And; During the threshold value of said PWM control unit 9 overcurrent in the detection signal of said detecting unit 8 surpasses corresponding to circuit; The action of adjustment Q1 and Q2; Reducing the pulse duration duty ratio in the T1 input voltage, thereby the average output voltage of T1 is reduced, reach purpose the overcurrent protection of the output signal of telecommunication.The setting of this threshold value can design the resistance with coupling resistance and realize that resistance is high more according to the service requirement of load equipment in the detection loop of SG3525 chip, this threshold value is high more, and then the initial current value of overcurrent protection action is high more; When said PWM control unit 9 reaches the threshold value of superheat state electric current in the detection signal of said overheated detecting unit 10 surpasses corresponding to circuit; Cut off the pwm signal output of SG3525 chip; Make Q1 and Q2 be in off state, then the voltage of T1 is output as 0, reaches the purpose of overtemperature protection.Particularly, detecting unit 8 is the inductance L 2 in the output loop that is serially connected in T1, and overheated detecting unit 10 is the bead L3 in the input circuit that is serially connected in T1, and the detection signal of L2 and L3 output is induced current.
Be connected with full merit/half merit change over switch, some lamp switch, power supply indicator, malfunction indicator lamp, voltmeter and ammeter on the said PWM control unit 9; Wherein, said full merit/half merit change over switch is controlled the output signal of said SG3525 chip adjustment Q1 and Q2 duty ratio; Said some lamp switch controlled said SG3525 chip and opened/turn-off Q1 and Q2, thus control T1 output/cut-out driving voltage; Said power supply indicator is lighted when being in "on" position at said PWM control unit (9); Said malfunction indicator lamp is lighted when being in malfunction at said PWM control unit (9); The output voltage values of energy-saving electric transformer under the said voltmeter indicating operating status; The output current value of energy-saving electric transformer under the said ammeter indicating operating status.
The shell of above-mentioned energy-saving electric transformer is shown in Fig. 3 and 4; Be provided with " power supply " indicator light, " warning " indicator light (being said malfunction indicator lamp), ammeter " A " and voltmeter " V ", " electric current " adjusting knob, " remote control " switch, " remote control/this machine " change over switch, " full merit/half merit " change over switch and " lighting a lamp/turn off the light " switch at outer casing frontispiece, " input " binding post that is provided with three-phase at the shell back side and two mutually " output " binding posts.
A kind of manual operation method of operating above-mentioned energy-saving electric transformer, as shown in Figure 5, comprise the steps:
1) opens the power of transformer switch, promptly open Local Switch behind the power switch switch;
2) power output of adjustment transformer is the half the of rated value, is about to full merit/half merit diverter switch and switches to half merit position;
3) open the switch of Exposing Lamp, promptly press a lamp switch;
4) after the output current of treating transformer rises to rated current, the power output of transformer is adjusted to the quota of rated value, promptly after ammeter rises to rated current, full merit/half merit diverter switch is switched to adjustable and puts.
In the above-mentioned steps 3, press a lamp switch after because the driving voltage of Exposing Lamp is from T1, its voltage that starts moment is very high, it is stable then to become subsequently, can adapt to the load characteristic of Exposing Lamp equipment.
More than the disclosed more excellent specific embodiment that is merely the utility model, still, the utility model is not limited thereto, any those skilled in the art can think variation all should fall into the protection range of the utility model.
Claims (9)
1. an energy-saving electric transformer is characterized in that, comprising:
Power module, external civil power, and civil power converted into the required DC driven signal of telecommunication of transformer and exchange control signal of telecommunication output;
The transformation module, the DC driven electrical signal conversion that said power module is exported is the required high-power high-frequency square wave alternating-current signal of telecommunication of driving Exposing Lamp; And
Control module comprises pulse width modulation controlled unit (9), controls said transformation module and carries out the transformation action, and said transformation module is carried out overcurrent protection and overtemperature protection.
2. energy-saving electric transformer according to claim 1 is characterized in that: said power module comprises filter (1), accessory power supply (2), rectification unit (3) and filter unit (4), wherein:
Said filter (1) comprises the filter capacitor of three Y-connections, and this filter (1) external 380V AC power frequency civil power also carries out filtering;
Said accessory power supply (2) is a transformer (BT1), and its former limit is connected on two phase lines of said filter (1), and its secondary provides the control signal of telecommunication to said control module;
Said rectification unit (3) is a bridge rectifier, and the three-phase alternating current electrical signal conversion that said filter (1) is exported is a dc signal;
Said filter unit (4) is the RC filter circuit, and the dc signal that said rectification unit (3) is exported carries out filtering.
3. energy-saving electric transformer according to claim 2 is characterized in that: said filter unit (4) comprising:
Be serially connected in first electric capacity (C1) and second electric capacity (C2) between two outputs of said rectification unit (3), the common end grounding of these two electric capacity (C1, C2);
The 3rd electric capacity (C3) between two output that are connected on said rectification unit (3);
First resistance (R1) parallelly connected with above-mentioned the 3rd electric capacity (C3); And,
Be connected on the 4th electric capacity (C4) and the 5th electric capacity (C5) between two outputs of said rectification unit (3).
4. energy-saving electric transformer according to claim 1 is characterized in that: said transformation module comprises inversion unit (5), boosting unit (6) and ballast filter unit (7); Wherein,
Said inversion unit (5) receives the DC driven signal of telecommunication of said power module output, and under the control of said pulse width modulation controlled unit (9), is the ac square-wave voltage signal with this DC driven electrical signal conversion;
Said boosting unit (6) is a high frequency transformer (T1), and the ac square-wave voltage signal that said inversion unit (5) is exported boosts;
Said ballast filter unit (7) carries out the ballast Filtering Processing to the signal of telecommunication of said boosting unit (6) output, and the signal of telecommunication after will handling is exported to and used electric loading.
5. energy-saving electric transformer according to claim 4; It is characterized in that: said inversion unit (5) is a half bridge inverter circuit; One of them brachium pontis is composed in series by first switching tube (Q1) and second switch pipe (Q2); Said first switch (Q1) and second switch (Q2) all are IGBT modules that power is not less than 5KW, and the emitter of said first switching tube (Q1) is connected with the collector electrode of said second switch pipe (Q2);
Another brachium pontis is connected successively by the 4th resistance (R4), the 6th electric capacity (C6), the 5th resistance (R5) and the 7th electric capacity (C7) and is formed; The other end of the 4th resistance (R4) is connected with the collector electrode of said first switching tube (Q1), and the other end of the 7th electric capacity (C7) is connected with the emitter of said second switch pipe (Q2); And,
The grid of said first switch (Q1) is in series with second resistance (R2), and the emitter of the other end of this second resistance (R2) and said first switch (Q1) is connected on the said pulse width modulation controlled unit (9);
The grid of said second switch (Q2) is in series with the 3rd resistance (R3), and the emitter of the other end of the 3rd resistance (R3) and said second switch (Q2) is connected on the said pulse width modulation controlled unit (9).
6. energy-saving electric transformer according to claim 5; It is characterized in that: an end on the former limit of said high frequency transformer (T1) had both connected the common port of the 5th resistance (R5) and the 6th electric capacity (C6); Connect the common port of first switching tube (Q1) and second switch pipe (Q2) again, the other end on the former limit of said high frequency transformer (T1) then is connected the common port of the 4th electric capacity (C4) and the 5th electric capacity (C5).
7. energy-saving electric transformer according to claim 5 is characterized in that: said ballast filter unit (7) comprises respectively first inductance (L1) that two electric capacity (C8, C9) of two-way output the carrying out filtering of said boosting unit (6) and output loop to said boosting unit (6) is carried out ballast.
8. energy-saving electric transformer according to claim 1; It is characterized in that: said control module also comprises a detecting unit (8); Detect the size of current in the output loop of said transformation module, and the corresponding detection signal of output is given said pulse width modulation controlled unit (9);
An overheated detecting unit (10) detects the size of current in the input circuit of said transformation module, and the corresponding detection signal of output is given said pulse width modulation controlled unit (9); And,
When said pulse width modulation controlled unit (9) surpasses certain threshold value at the detection signal of said detecting unit (8), adjust said transformation module and reduce the pulse duration duty ratio;
When said pulse width modulation controlled unit (9) surpasses certain threshold value at the detection signal of said overheated detecting unit (10), cut off the voltage output of said transformation module.
9. according to the said energy-saving electric transformer of claim 1; It is characterized in that: the control core of said pulse width modulation controlled unit (9) is the SG3525 chip, is connected with full merit/half merit change over switch, some lamp switch, power supply indicator, malfunction indicator lamp, voltmeter and ammeter on this pulse width modulation controlled unit (9); Wherein,
Said full merit/half merit change over switch is controlled the output signal of said SG3525 chip to said transformation module duty ratio;
Said some lamp switch controlled the output signal that said transformation module outputting drive voltage was opened/turn-offed to said SG3525 chip;
Said power supply indicator is lighted when being in "on" position in said pulse width modulation controlled unit (9);
Said malfunction indicator lamp is lighted when being in malfunction in said pulse width modulation controlled unit (9);
The output voltage values of said voltmeter indicating operating status;
The output current value of said ammeter indicating operating status.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120255579U CN202142986U (en) | 2011-07-18 | 2011-07-18 | Energy-saving electronic transformer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120255579U CN202142986U (en) | 2011-07-18 | 2011-07-18 | Energy-saving electronic transformer |
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| CN202142986U true CN202142986U (en) | 2012-02-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201120255579U Expired - Fee Related CN202142986U (en) | 2011-07-18 | 2011-07-18 | Energy-saving electronic transformer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102386784A (en) * | 2011-07-18 | 2012-03-21 | 银超 | Energy-saving electronic transformer and operation method thereof |
| CN113805002A (en) * | 2021-09-17 | 2021-12-17 | 广东电网有限责任公司 | Detection device, method and equipment for power electronic direct current transformer and storage medium |
-
2011
- 2011-07-18 CN CN201120255579U patent/CN202142986U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102386784A (en) * | 2011-07-18 | 2012-03-21 | 银超 | Energy-saving electronic transformer and operation method thereof |
| CN113805002A (en) * | 2021-09-17 | 2021-12-17 | 广东电网有限责任公司 | Detection device, method and equipment for power electronic direct current transformer and storage medium |
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