CN205232039U - Converter main circuit and converter - Google Patents
Converter main circuit and converter Download PDFInfo
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- CN205232039U CN205232039U CN201520793251.XU CN201520793251U CN205232039U CN 205232039 U CN205232039 U CN 205232039U CN 201520793251 U CN201520793251 U CN 201520793251U CN 205232039 U CN205232039 U CN 205232039U
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Abstract
The embodiment of the utility model discloses converter main circuit and converter, the converter main circuit includes: the rectifier that the input links to each other with the power, the first input end with the first input end of rectifier, second input with the second input active power filter circuit that link to each other, that output changes along with the input of rectifier, a plurality of first input ends with the first output of active power filter circuit links to each other, the second input with the continuous dc -to -ac converter module of second output of active power filter circuit. Above -mentioned scheme is right through adopting the active power filter circuit the output current of rectifier carries out filtering to be handled for current continuity on the reactor just keeps unanimous with the input voltage phase place, thereby can make ripple on the reactor reduces, the loss that results in the reactor with and the heat that sends just also less, consequently make the bulk reduction of the reactor of required design.
Description
Technical field
The utility model relates to converter technology field, more particularly, relates to a kind of main circuit of converter, frequency converter.
Background technology
Current track vehicle air conditioning is drive with power frequency supply mostly, but due to the fast development of converter technique, adopts frequency conversion drive mode to drive air-conditioning to become mainstream development trend.Frequency conversion drive mode can provide for air-conditioner temperature control system the flexibility greatly controlled.
In prior art, there is various ways in the front end input of the frequency converter that railway vehicle air conditioner is applied, wherein the situation of single-phase ac power supply is the most complicated, when usually directly adopting LC filter to carry out filtering process to the output current of rectifier in frequency converter, electric current on reactor is rendered as on-off state, and current spike is very large, when electric current is larger, the loss of reactor and electric capacity is also larger, generates heat also more serious.Because the former ripple current is too large, volume during reactor design also can be very large, and how solving the volume reducing reactor becomes one of those skilled in the art's technical problem urgently to be resolved hurrily.
Utility model content
The purpose of this utility model is to provide a kind of main circuit of converter, the problem that the design volume for solving the reactor in prior art in frequency converter is larger.
For achieving the above object, the utility model embodiment provides following technical scheme:
A kind of main circuit of converter, comprising:
Rectifier, the input of described rectifier is for connecting power supply;
Be connected with described rectifier and export with inputting the active filter circuit changed, the first input end of described active filter circuit is connected with the positive output end of described rectifier, and the second input of described active filter circuit is connected with the negative output terminal of described rectifier;
At least 1 inverter module be connected with described active filter circuit, the first input end of described inverter module is connected with the first output of described active filter circuit, and the second input of described inverter module is connected with the second output of described active filter circuit.
Preferably, in above-mentioned main circuit of converter, described active filter circuit is PFCBOOST type active filter circuit.
Preferably, in above-mentioned main circuit of converter, described active filter circuit comprises:
First reactor, the first end of described first reactor is as the first input end of described active filter circuit;
The first power switch pipe that first end is connected with described first reactor second end, the second end of described first power switch pipe is as the second input of described active filter circuit;
The first diode that anode is connected with the second end of described first reactor;
The first electric capacity that first end is connected with the negative electrode of described first diode, the second end is connected with the second end of described first power switch pipe, the first end of described first electric capacity as the first output of described active filter circuit, the second end as the second output of described active filter circuit;
With the first resistance of described first Capacitance parallel connection.
Preferably, in above-mentioned main circuit of converter, described active filter circuit comprises:
Second power switch pipe, the first end of described second power switch pipe is as the first input end of described active filter circuit;
Second electric capacity in parallel with described second power switch pipe;
Negative electrode is connected with the second end of described second power switch pipe, anode is as the second diode of the second input of described active filter circuit;
First end is connected with the second end of described second power switch pipe, the second end is as the second reactor of the first output of described active filter circuit;
The 3rd electric capacity that first end is connected with the second end of described second reactor, the second end is connected with the anode of described second diode, the second end of described 3rd electric capacity is as the second output of described active filter circuit;
With the second resistance of described 3rd Capacitance parallel connection.
Preferably, in above-mentioned main circuit of converter, also comprise:
For exporting the reference generator of target voltage values, the difference of the input voltage of described target voltage values and rectifier is in preset range;
For export described target voltage values and described active filter circuit output voltage between the subtracter of voltage difference, the output voltage that an input of described subtracter is connected with the output of described reference generator, another input is connected for obtaining described active filter circuit with the output of described active filter circuit;
Input is connected with the input of rectifier, absolute value circuit for being exported after absolute value process by the input voltage of described rectifier;
The multiplier that first input end is connected with the output of described absolute value circuit, the second input is connected with the output of described subtracter, obtains and exports target current value after described multiplier is used for described voltage difference to be multiplied with the absolute value of described input voltage;
First input end for described reactor of sampling output current, the second end input is connected with the output of described multiplier, output is connected with the control end of described power switch pipe, for generate according to the output current of described reactor and described target current value and output pulse width modulation signal to the current control mode pulse width modulator of power switch pipe.
Preferably, in above-mentioned main circuit of converter, be connected by pi regulator between described subtracter with described multiplier.
Preferably, in above-mentioned main circuit of converter, between the first input end of described inverter module and the first output of described active filter circuit, be provided with protector.
Preferably, in above-mentioned main circuit of converter, also comprise:
Be arranged on the preliminary filling switch between described power supply and described rectifier;
Described preliminary filling switch comprises:
The 3rd resistance that first end is connected with described power supply;
First contactor that second end is connected, the second end is connected with described rectifier of first end and described 3rd resistance;
Second contactor that first end is connected, the other end is connected with the second end of described first contactor of one end and described 3rd resistance.
Preferably, in above-mentioned main circuit of converter, also comprise:
Be arranged on the preliminary filling switch between described power supply and described rectifier;
Described preliminary filling switch comprises:
3rd contactor, the first end of the first normally opened contact of described 3rd contactor is connected with the first phase line of described power supply, the second end of the first normally opened contact is connected with the first input end of described rectifier; The first end of the second normally opened contact of described 3rd contactor is connected with the second phase line of described power supply, the second end is connected with the second input of rectifier;
4th contactor, the first normally opened contact of described 4th contactor is in parallel with the second normally opened contact of described 3rd contactor, and the first end of the second normally opened contact of described 4th contactor is connected with the first phase line of described power supply;
And the 4th resistance that one end is connected with the second end of the second normally opened contact of described 4th contactor, the other end is connected with the first input end of described rectifier.
A kind of frequency converter, application has main circuit of converter disclosed in above-mentioned any one.
In technique scheme disclosed in the present application, active filter circuit is adopted to carry out filtering process to the output current of described rectifier, because active filter circuit adopts IGBT chopping way to control the electric current flowing through reactor, one-way communication is converted to the direct current that ripple is less, the harmonic wave that filtering load brings also serves the effect of correcting power factors, therefore, user is by exporting specific chopping signal to make the current continuity on reactor and to be consistent with the input voltage phase of rectifier to described active filter circuit, thus the ripple on described reactor can be made to reduce, cause the loss of reactor and its heat sent also just less, therefore the volume of the reactor of required design is made to reduce.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The structure chart of Fig. 1 a kind of main circuit of converter disclosed in the utility model embodiment;
The structure chart of Fig. 2 a kind of main circuit of converter disclosed in another embodiment of the utility model;
The control principle block diagram of Fig. 3 a kind of active filter circuit disclosed in the embodiment of the present application.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
In order to reduce the volume of the reactor in frequency converter that railway vehicle air conditioner applies, this application discloses a kind of new frequency converter, the volume of the reactor in described frequency converter can suitably be reduced.
Fig. 1 is main circuit of frequency converter schematic diagram disclosed in the embodiment of the present application, see Fig. 1, comprising:
Rectifier 1, the input of described rectifier 1 is for connecting power supply;
Be connected with described rectifier and export with inputting the active filter circuit 2 changed, the first input end of described active filter circuit 2 is connected with the positive output end of described rectifier 1, and the second input of described active filter circuit 2 is connected with the negative output terminal of described rectifier 1;
At least 1 inverter module 3 be connected with described active filter circuit 2, the first input end of described inverter module 3 is connected with the first output of described active filter circuit 2, and the second input of described inverter module 3 is connected with the second output of described active filter circuit 2.
Wherein rectifier 1 described in above-described embodiment can adopt the rectifier of any one type of the prior art, and the schematic construction of the bridge rectifier provided in described Fig. 1 is just in order to be described technical scheme disclosed in the present application better.
Known see technical scheme disclosed in the above embodiments of the present application, in technique scheme disclosed in the present application, active filter circuit is adopted to carry out filtering process to the output current of described rectifier, because active filter circuit adopts IGBT chopping way to control the electric current flowing through reactor, one-way communication is converted to the direct current that ripple is less, the harmonic wave that filtering load brings also serves the effect of correcting power factors, therefore, user is by exporting specific chopping signal to make the current continuity on reactor and to be consistent with the input voltage phase of rectifier to described active filter circuit, thus the ripple on described reactor can be made to reduce, cause the loss of reactor and its heat sent also just less, therefore the volume of the reactor of required design is made to reduce.
Consider the applied environment (railway vehicle air conditioner) of the frequency converter of main circuit of converter disclosed in described application the above embodiments of the present application, described active filter circuit is preferably PFCBOOST type active filter circuit.
Disclosed herein as well is two kinds of active filter circuits, its structure is see shown in Fig. 1 and Fig. 2;
See Fig. 1, described active filter circuit disclosed in the present embodiment is PFCBOOST type circuit, it is made up of the first reactor L1, the first diode D1, the first power switch pipe K1, the first electric capacity C1 and the first resistance R1, and the annexation of each electronic component above-mentioned is:
The first end of described first reactor L1 is as the first input end of described active filter circuit 2; The first end of described first power switch pipe K1 is connected with second end of described first reactor L1, and second end of described first power switch pipe K1 is as the second input of described active filter circuit 2; The anode of described first diode D1 is connected with second end of described first reactor L1; The first end of described first electric capacity C1 is connected with the negative electrode of described first diode D1, the second end is connected with second end of described first power switch pipe K1, the first end of described first electric capacity C1 as the first output of described active filter circuit 2, the second end as the second output of described active filter circuit 2; Described first resistance R1 is in parallel with described first electric capacity C1.
See Fig. 2, described active filter circuit disclosed in the present embodiment is PFCBUCK circuit, it is made up of the second reactor L2, the second diode D2, the second power switch pipe K2, the second electric capacity C2, the 3rd electric capacity C3 and the second resistance R2, and the annexation of each electronic component above-mentioned is:
The first end of described second power switch pipe K2 is as the first input end of described active filter circuit 2; Described second electric capacity C2 is in parallel with described second power switch pipe K2; The negative electrode of described second diode D2 is connected with second end of described second power switch pipe K2, anode is as the second input of described active filter circuit 2; The first end of described second reactor L2 is connected with second end of described second power switch pipe K2, the second end is as the first output of described active filter circuit 2; The first end of described 3rd electric capacity C3 is connected with second end of described second reactor L2, the second end is connected with the anode of described second diode D2, and second end of described 3rd electric capacity C3 is as the second output of described active filter circuit 2; Described second resistance R2 is in parallel with described 3rd electric capacity C3.
In above-described embodiment, on described reactor, current ripples size is relevant to input and output voltage pressure reduction, and when pressure reduction is larger, ripple current is also larger, and the loss of reactor is also larger.Because power network fluctuating range is larger, if allow active filter circuit export fixed value voltage, then, when the input voltage of rectifier is lower, input and output pressure reduction can be very large, the loss of corresponding reactor also can be very large, and the volume of reactor therefore also can be caused to increase.In order to address this problem, see Fig. 3, applicant discloses the active filter circuit that above-mentioned output voltage changes with input voltage, its control principle can be: adopt double circle controling mode, wherein, inner ring controls the electric current I on reactor, and outer shroud controls output voltage Vo.Outer shroud exports the input voltage real-time change that target voltage values Vref follows rectifier, to ensure that the input voltage of described target voltage values Vref and described rectifier maintains within the scope of preset difference value; Calculate and export the output voltage Vo of described active filter circuit and the difference of described target voltage values Vref, after described difference being multiplied with the absolute value of the input voltage of rectifier, just can obtain the target current value Iref that waveform is consistent with the input voltage of rectifier.Reactor sample rate current Iin and described target current value Iref compares by inner ring, forms the control signal of close loop negative feedback output for regulating described power switch pipe switching frequency, thus regulates the change of reactor current Iin.See Fig. 3, the control circuit of described active filter circuit can comprise: reference generator 41, subtracter 42, multiplier 43, absolute value circuit 44 and current control mode pulse width modulator 45;
Described reference generator 41, for exporting and the target voltage values Vref of the difference of the input voltage vin of rectifier in preset range, namely described reference generator 41 is for given output voltage reference value Vref, described Vref according to the input voltage vin real-time change of rectifier, to keep the difference of the input voltage vin peak value of described target voltage values Vref and rectifier in preset range;
One end of described subtracter 42 is connected with the output of described reference generator 41, the other end is connected with the output of described active filter circuit the output voltage V0 for obtaining described active filter circuit 2, described subtracter 42 for export described target voltage values Vref and described active filter circuit 2 output voltage V0 between voltage difference △ U;
The described input of absolute value circuit 44 is connected with the input of rectifier, for by the input voltage vin of rectifier through the laggard line output of absolute value process;
The multiplier 43 that first input end is connected with the output of described absolute value circuit 44, the second input is connected with the output of described subtracter 42, described multiplier 43 obtains target current value Iref after being multiplied with the absolute value of the input voltage vin of described rectifier by described voltage difference △ U;
The first input end of described current control mode pulse width modulator 44 is for the output current Iin of described reactor of sampling, second end input is connected with the output of described multiplier, output is connected with the control end of the power switch pipe in described active filter circuit (described power switch pipe can be formed by for the switching tube of reverse parallel connection and diode), for according to the output current of described reactor and described target current value output pulse width modulation signal PWM, be consistent to make the output current of described reactor and described target current value.Wherein, when described active filter circuit is for active filter circuit shown in Fig. 1, described power switch pipe refers to the K1 in Fig. 1, and when described active filter circuit is for active filter circuit shown in Fig. 2, described power switch pipe refers to the K2 in Fig. 2.
In order to ensure stability, the optimal control performance of described voltage difference △ U, in the above embodiments of the present application, also be provided with pi regulator 43 between described subtracter 42 and described multiplier 43, described pi regulator 43 is for sending to multiplier 43 to after described voltage difference △ U optimization process.
In the controls, input signal is generally analog quantity, for the ease of to data processing, needing described analogue transformation is digital quantity, therefore, in the above embodiments of the present application, before the input voltage of described rectifier inputs to described multiplier 44, a Z-transformation can also be carried out.The output signal of described subtracter 42 inputs between described pi regulator also can carry out a Z-transformation.
When described active filter circuit is PFCBOOST type active filter circuit, convert one-way communication input to ripple less direct current during described PFCBOOST type active filter circuit to export, the harmonic wave that filtering load brings also serves the effect of correcting power factors, and then reduce the impact on external electrical network.Because current ripples on reactor and input, output voltage pressure reduction are relevant, when pressure reduction is larger, ripple current is also larger, and the loss of reactor is also larger.Because large power network fluctuating range is comparatively large, if allow described PFCBOOST type active filter circuit export fixed value voltage, when line voltage is lower, input, the output pressure reduction of active filter circuit can be very large, and corresponding reactor loss also can be very large.In order to address this problem, active power filtering is designed to export the form with input change, during software control, strengthen the integral control degree of pi regulator, pace of change being delayed and would not follow-up Converting Unit be had an impact more slowly.
The main circuit of active filter circuit shown in Figure 3, its control mode controls for forming two close cycles formula by an outer voltage and a current inner loop.Target voltage values Vref changes in real time according to the input voltage vin peak value of rectifier, makes the input voltage vin peak value of described target voltage values Vref and rectifier maintain a less pressure reduction.Voltage difference Δ U after pi regulator is multiplied with the input voltage vin absolute value of rectifier and obtains target current value Iref, and described target current value Iref is identical with the input voltage vin phase place of rectifier, and amplitude is relevant to Δ U.Described target current value Iref and input current Iin makes comparisons by described current control mode pulse width modulator, and converts PWM output driving IGBT to, thus the amplitude of control Iin and phase place.
In order to improve the reliability of system; see Fig. 1; in the above embodiments of the present application, be provided with protector F between the first input end of each described inverter module and the first output of described active filter circuit, described protector F can be fuse or overcurrent protector.
In order to protect described main circuit of converter; prevent rush of current excessive and damage is caused to described main circuit of converter; preliminary filling switch 5 can also be comprised in described main circuit of converter disclosed in the above embodiments of the present application; wherein; the structure of described preliminary filling switch 5 can according to user's request sets itself; for example, see Fig. 1 and Fig. 2, the described preliminary filling switch-linear hybrid in the embodiment of the present application is between power supply and described rectifier 1.
See Fig. 1, described preliminary filling switch specifically can comprise:
The 3rd resistance R3 that first end is connected with described power supply;
The first contactor T1 that first end is connected with described 3rd resistance R3 second end, the second end is connected with described rectifier 1;
The second contactor T2 that one end is connected with the first end of described 3rd resistance R3, the other end is connected with second end of described first contactor T1.
See Fig. 2, described preliminary filling switch specifically can comprise:
3rd contactor, the first end of the first normally opened contact T3 of described 3rd contactor is connected with the first phase line of described power supply, second end of the first normally opened contact T3 is connected with the first input end of described rectifier 1; The first end of the second normally opened contact T4 of described 3rd contactor is connected with the second phase line of described power supply, the second end is connected with the second input of described rectifier 1; First normally opened contact T3 and the second normally opened contact T4 of described 3rd contactor are in parallel;
4th contactor, first normally opened contact T5 of described 4th contactor is in parallel with the second normally opened contact T4 of described 3rd contactor, the first end of the second normally opened contact T6 of described 4th contactor is connected with the first phase line of described power supply, and the first normally opened contact T5 of described 4th contactor and the second normally opened contact T6 of described 4th contactor links;
And the 4th resistance R4 that one end is connected with second end of the second normally opened contact T6 of described 4th contactor, the other end is connected with the first input end of described and described rectifier 1.
Be directed to described preliminary filling switch, can also comprise in described main circuit of converter disclosed in the above embodiments of the present application one with being connected in described preliminary filling switch, preliminary filling on-off controller for controlling the on off state of the power switch pipe in described preliminary filling switch.
Be directed to above-mentioned main circuit of converter, disclosed herein as well is the frequency converter that a kind of application has main circuit of converter disclosed in the above-mentioned any embodiment of the application.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the utility model.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein when not departing from spirit or scope of the present utility model, can realize in other embodiments.Therefore, the utility model can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a main circuit of converter, is characterized in that, comprising:
Rectifier, the input of described rectifier is for connecting power supply;
Be connected with described rectifier and export with inputting the active filter circuit changed, the first input end of described active filter circuit is connected with the positive output end of described rectifier, and the second input of described active filter circuit is connected with the negative output terminal of described rectifier;
At least 1 inverter module be connected with described active filter circuit, the first input end of described inverter module is connected with the first output of described active filter circuit, and the second input of described inverter module is connected with the second output of described active filter circuit.
2. main circuit of converter according to claim 1, is characterized in that, described active filter circuit is PFCBOOST type active filter circuit.
3. main circuit of converter according to claim 1, is characterized in that, described active filter circuit comprises:
First reactor, the first end of described first reactor is as the first input end of described active filter circuit;
The first power switch pipe that first end is connected with described first reactor second end, the second end of described first power switch pipe is as the second input of described active filter circuit;
The first diode that anode is connected with the second end of described first reactor;
The first electric capacity that first end is connected with the negative electrode of described first diode, the second end is connected with the second end of described first power switch pipe, the first end of described first electric capacity as the first output of described active filter circuit, the second end as the second output of described active filter circuit;
With the first resistance of described first Capacitance parallel connection.
4. main circuit of converter according to claim 1, is characterized in that, described active filter circuit comprises:
Second power switch pipe, the first end of described second power switch pipe is as the first input end of described active filter circuit;
Second electric capacity in parallel with described second power switch pipe;
Negative electrode is connected with the second end of described second power switch pipe, anode is as the second diode of the second input of described active filter circuit;
First end is connected with the second end of described second power switch pipe, the second end is as the second reactor of the first output of described active filter circuit;
The 3rd electric capacity that first end is connected with the second end of described second reactor, the second end is connected with the anode of described second diode, the second end of described 3rd electric capacity is as the second output of described active filter circuit;
With the second resistance of described 3rd Capacitance parallel connection.
5. the main circuit of converter according to claim 3 or 4, is characterized in that, also comprises:
For exporting the reference generator of target voltage values, the difference of the input voltage of described target voltage values and rectifier is in preset range;
For export described target voltage values and described active filter circuit output voltage between the subtracter of voltage difference, the output voltage that an input of described subtracter is connected with the output of described reference generator, another input is connected for obtaining described active filter circuit with the output of described active filter circuit;
Input is connected with the input of rectifier, absolute value circuit for being exported after absolute value process by the input voltage of described rectifier;
The multiplier that first input end is connected with the output of described absolute value circuit, the second input is connected with the output of described subtracter, obtains and exports target current value after described multiplier is used for described voltage difference to be multiplied with the absolute value of described input voltage;
First input end for described reactor of sampling output current, the second end input is connected with the output of described multiplier, output is connected with the control end of described power switch pipe, for generate according to the output current of described reactor and described target current value and output pulse width modulation signal to the current control mode pulse width modulator of power switch pipe.
6. main circuit of converter according to claim 5, is characterized in that, is connected between described subtracter with described multiplier by pi regulator.
7. main circuit of converter according to claim 1, is characterized in that, is provided with protector between the first input end of described inverter module and the first output of described active filter circuit.
8. main circuit of converter according to claim 1, is characterized in that, also comprises:
Be arranged on the preliminary filling switch between described power supply and described rectifier;
Described preliminary filling switch comprises:
The 3rd resistance that first end is connected with described power supply;
First contactor that second end is connected, the second end is connected with described rectifier of first end and described 3rd resistance;
Second contactor that first end is connected, the other end is connected with the second end of described first contactor of one end and described 3rd resistance.
9. main circuit of converter according to claim 1, is characterized in that, also comprises:
Be arranged on the preliminary filling switch between described power supply and described rectifier;
Described preliminary filling switch comprises:
3rd contactor, the first end of the first normally opened contact of described 3rd contactor is connected with the first phase line of described power supply, the second end of the first normally opened contact is connected with the first input end of described rectifier; The first end of the second normally opened contact of described 3rd contactor is connected with the second phase line of described power supply, the second end is connected with the second input of rectifier;
4th contactor, the first normally opened contact of described 4th contactor is in parallel with the second normally opened contact of described 3rd contactor, and the first end of the second normally opened contact of described 4th contactor is connected with the first phase line of described power supply;
And the 4th resistance that one end is connected with the second end of the second normally opened contact of described 4th contactor, the other end is connected with the first input end of described rectifier.
10. a frequency converter, is characterized in that, applies main circuit of converter disclosed in requirement 1-9 any one of having the right.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520793251.XU CN205232039U (en) | 2015-10-14 | 2015-10-14 | Converter main circuit and converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520793251.XU CN205232039U (en) | 2015-10-14 | 2015-10-14 | Converter main circuit and converter |
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| CN205232039U true CN205232039U (en) | 2016-05-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108738179A (en) * | 2017-04-14 | 2018-11-02 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heater and its control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108738179A (en) * | 2017-04-14 | 2018-11-02 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heater and its control method |
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