CN204761745U - Servo heating system - Google Patents
Servo heating system Download PDFInfo
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- CN204761745U CN204761745U CN201520500502.0U CN201520500502U CN204761745U CN 204761745 U CN204761745 U CN 204761745U CN 201520500502 U CN201520500502 U CN 201520500502U CN 204761745 U CN204761745 U CN 204761745U
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Abstract
The utility model relates to a servo heating system. Induction power supply, load module and temp. Control module, induction power supply are used for output interflow electricity to load module to according to the electric frequency of alternating current signals regulating output interflow of load module output, frequency convergence in the natural frequency of load module of control output interflow electricity, the power invariant that makes the heating, the load module is connected with induction power supply for receive the alternating current of induction power supply output, produce induced magnetic field, temp. Control module is used for setting for induction power supply's settlement output. This servo heating system adjusts the alternating current of the corresponding frequency of induction power supply output according to the alternating current signal of load module output for the frequency of output interflow electricity tends to the natural frequency of load module, has guaranteed heating power's invariant, the whole automated control that realizes.
Description
Technical field
The utility model relates to automation field, more particularly, relates to a kind of servo heating system.
Background technology
Electromagnetic induction heating technology, by electromagnetic induction principle transferring energy, utilizes eddy current to heat workpiece.Electromagnetic induction heating with coal, oil, gas is that the energy or cabinet-type electric furnace heating are completely different, electric energy directly can be delivered to inside workpiece and changes heat energy into and heat workpiece by it, there is the efficiency of heating surface high, speed is fast, homogeneous heating and there is selectivity, controllability is good, easily be automated, site environment is good, operation is taken up an area few, electricity-saving labor-saving, the advantages such as constant product quality, therefore it is not only in melting, casting, bend pipe, forge hot, welding, Surface heat-treatent, the traditional industry heating industries such as powder metallurgy are used widely, but also be applied to the zone-refine of semiconductor, the modern hot working industry such as single wafer epitaxy, in recent years, along with the continuous popularization of the electromagnetic oven of employing induction heating technique, electromagnetic induction heating technology has entered the family life of people.
Traditional mode of heating needs debugging control manually, and heat utilization ratio is low, environmental pollution is large, control accuracy is low, easily causes temperature environment to the loss of components and parts etc.
Utility model content
The technical problems to be solved in the utility model is, provides a kind of servo heating system, whole-process automatic debugging control, and can make response limiting to ensure the constant of heating power according to the not characteristic in the same time of load blocks.
The utility model solves the technical scheme that its technical problem adopts: construct a kind of servo heating system and comprise: temperature control module, induction power supply and load blocks;
Described induction power supply is connected with described temperature control module, and sets the setpoint power output of described induction power supply by described temperature control module;
Described induction power supply is connected with described load blocks and temperature control module, according to described setpoint power output output AC electricity to described load blocks, and the output frequency of described alternating current is adjusted according to the load parameter of the described alternating current exported, mate with described setpoint power output with the power controlling to export described alternating current;
Described load blocks, is connected with described induction power supply, for receiving the alternating current that described induction power supply exports, produces induced field.
Preferably, described induction power supply is superaudio induction power supply;
Described load blocks comprises the induction coil, the coil brace for described induction coil winding, the heat-insulation layer that is arranged on the crucible in described coil brace and is arranged between described crucible and described coil brace that are electrically connected with described induction power supply.
Preferably, described temperature control module is temp controlled meter or PLC, comprises temperature setting module and temperature control modules;
Described temperature setting module for setting the heating-up temperature of described induction power supply, and obtains described setpoint power output according to described heating-up temperature; Described setpoint power output is the power output or fixing power output of mating with process temperature control curve;
Described temperature control modules is connected with described temperature setting module, exports corresponding firm power for controlling described induction power supply according to described setpoint power output.
Preferably, described induction power supply comprises current detection module, calculating control circuit and driver output circuit;
Described current detection module is connected with the output of described driver output circuit, detects the load parameter of the described alternating current of described output;
Described calculating control circuit is connected with described current detection module and temperature control module, described load parameter according to detecting calculates equivalent sensibility reciprocal, equiva lent impedance, by the described equiva lent impedance calculated compared with the setting resistance value obtained according to described setpoint power output, what export corresponding frequencies controls signal to described driver output circuit;
Described driver output circuit is connected with described calculating control circuit and load blocks, according to the frequency of the described alternating current that described control signal adjustment exports, the power of described alternating current is mated with described setpoint power output.
Preferably, described load parameter comprises current value and/or the phase place of described alternating current.
Preferably, described temperature control modules comprises temperature detecting module and control module,
Described temperature detecting module, for detecting the temperature of described load blocks;
Described control module, be connected with described temperature detecting module and described temperature setting module, export corresponding firm power for induction power supply according to described setting heating and temperature control and judge that whether the described temperature of described load blocks is higher than preset value, if so, then control described induction power supply and stop output AC electricity.
Preferably, described induction power supply inside also comprises current acquisition module,
Described current acquisition module, is connected with the output of described induction power supply, for gathering the current signal of described induction power supply output and being converted to voltage signal and exporting;
Described calculating control circuit also comprises calculation control unit, analog-to-digital conversion unit and alarm unit, described analog-to-digital conversion unit and described current acquisition model calling, for receiving the voltage signal of described current acquisition module output and being converted into digital signal and exporting;
Described calculation control unit is connected with described alarm unit and described analog-to-digital conversion unit, calculate for receiving described digital signal and judge that the voltage of the alternating current that described driver output circuit input end accesses is whether in the range of normal value preset, if the voltage of the alternating current of described driver output circuit input end access is greater than default normal value, then controls described alarm unit and send overtension warning.
Preferably, described servo heating system also comprises time controller,
Described time controller is connected with described induction power supply, for controlling described induction power supply output AC electricity within the time period of presetting;
Or described time controller is connected with described load blocks, disconnect after preset time period for controlling described load blocks.
Preferably, described calculating control circuit is also connected with described load blocks, and described calculation control unit also for according to detecting that the parameter of described load blocks judges whether open circuit or short circuit, if so, then controlling described alarm unit and sending open circuit or short-circuit alarming.
Implement servo heating system of the present utility model, there is following beneficial effect: by induction power supply output AC electricity to load blocks, load blocks receives the alternating current generation induced field that induction power supply exports, induced field is utilized to heat, the frequency of the ac signal adjustment output AC electricity that induction power supply feeds back according to load blocks, control the frequency approach of output AC electricity in the fixed frequency of load blocks, induction power supply is heated with constant thermal power, the process of servo heating is all realized by Automated condtrol, is convenient to control.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is described in further detail, in accompanying drawing:
Fig. 1 is the structured flowchart of the utility model servo heating system;
Fig. 2 is the workflow diagram of the utility model servo heating system.
Embodiment
As shown in Figure 1, in the first embodiment of servo heating system of the present utility model, servo heating system comprises induction power supply 1, load blocks 2 and temperature control module 3.
Induction power supply 1 for electric to load blocks 2 according to setpoint power output output AC, and adjusts the output frequency of this alternating current according to the load parameter of the alternating current exported, mate with setpoint power output with the power controlling output AC electricity.The frequency approach controlling output AC electricity, in the natural frequency of load blocks 2, makes heating power constant.Induction power supply 1 applies the cold induction power supply of full blast, saving water resource, avoids the potential safety hazard because water route fault causes.
Wherein, induction power supply 1 is superaudio induction power supply, and frequency range is approximately 5-40K.Above-mentioned load parameter comprises current value and/or the phase place of alternating current.
Induction power supply 1 comprises current detection module 13, calculating control circuit 11 and driver output circuit 12.
Current detection module 13 is connected with the output of driver output circuit 12, detects the load parameter of the alternating current of driver output circuit 12 output.
Calculating control circuit 11 is connected with current detection module 13 and temperature control module 3, wherein, calculating control circuit 11 comprises calculation control unit 111, according to the equivalent sensibility reciprocal of the load parameter computational load module 2 that current detection module 13 detects, and calculate equiva lent impedance, and compare according to calculated equiva lent impedance and setting resistance value, what export corresponding frequencies controls signal to driver output circuit 12.Wherein, this setting resistance value can calculate according to the setpoint power output of temperature control module 3.
Driver output circuit 12 is connected with calculating control circuit 11 and load blocks 2, according to the frequency of the alternating current that the control signal adjustment of the corresponding frequencies of calculating control circuit 11 output exports, the power of alternating current is mated with setpoint power output.Wherein, the rear class of driver output circuit 12 is resonant element.
Load blocks 2 is connected with induction power supply 1, for receiving the alternating current that induction power supply 1 exports, producing induced field, producing eddy current, heat with the object of motivation needs heating.Load blocks 2 comprises induction coil (not shown), servo heating system also comprises inductance, electric capacity and coil brace (not shown), inductance and capacitances in series are connected between induction coil and induction power supply 1, inductance, electric capacity and induction coil composition series resonant circuit; Coil brace is for supporting induction coil.
Load blocks 2 comprises the induction coil (not shown), the coil brace (not shown) for this induction coil winding, the heat-insulation layer (not shown) that is arranged on the crucible (not shown) in this coil brace and is arranged between this crucible and this coil brace that are electrically connected with high frequency induction power supply.Heating needing the workpiece of heating to be placed on crucible, having one layer of heat preservation layer at the external sheath of crucible simultaneously, reduce scattering and disappearing of the heat on crucible, protect induction coil from the hyperthermia radiation of crucible simultaneously.
Temperature control module 3 is connected with induction power supply 1, for setting the setpoint power output of induction power supply 1.
Wherein, temperature control module 3 is temp controlled meter or PLC, comprises temperature setting module 31, temperature control modules 32 and temperature detecting module 33.
Temperature setting module 31 is for setting the heating-up temperature of induction power supply 1, and obtain corresponding setpoint power output according to this heating-up temperature, this setpoint power output is the power output or fixing power output of mating with process temperature control curve.
Temperature control modules 32 is connected with temperature setting module 31, exports corresponding firm power for exporting corresponding signal controlling induction power supply 1 according to setpoint power output.
Wherein, temperature control modules 32 comprises temperature detecting module 321 and control module 322.Temperature detecting module 321, for detecting the temperature of load blocks 2.Control module 322, be connected with temperature detecting module 321 and temperature setting module 31, for exporting corresponding firm power according to the heating and temperature control induction power supply 1 of setting and judge that whether the heating-up temperature of load blocks 2 is higher than preset value, if the heating-up temperature of load blocks 2 is higher than preset value, then control induction power supply 1 and stop output AC electricity, stop heating.When after stopping heating, temperature detecting module 321 detects the heating-up temperature of load blocks 2 again, and when the heating-up temperature of the load blocks 2 collected is lower than preset value, then control module 322 controls induction power supply 1 and starts output AC electricity, starts heating.Temperature control modules 32 is temp controlled meter or PLC (ProgrammableLogicController, programmable logic controller (PLC)) controller.
Calculating control circuit 11 can use DSP (digitalsignalprocessor, digital signal processor) chip, as the TMS320F28015 processor of Texas Instrument (TexasInstruments).Calculation control unit 111 and alarm unit 112 are arranged in this dsp chip, for realizing servo (servo system: be the output such as position, orientation, state making object, any change of input variable (or set-point) and the automatic control system that changes can be followed) heating, from the natural frequency of motion tracking load blocks 2, carry out frequency conversion self adaptation, realize firm power and export.
Induction power supply 1 inside also comprises current acquisition module 14.Current acquisition module 14, be also the rear class of driver output circuit 12 with the output of induction power supply 1, namely resonant element connects, and for gathering the current signal that induction power supply 1 inversion exports, exports after being converted to voltage signal by circuit board.
Calculating control circuit 11 also comprises alarm unit 112 and analog-to-digital conversion unit 113, and analog-to-digital conversion unit 113 is connected with current acquisition module 14, for receiving the voltage signal of described current acquisition module 14 output and being converted into digital signal and exporting.
Calculation control unit 111 is also connected with alarm unit 112 and analog-to-digital conversion unit 113, calculate for receiving the digital signal exported from analog-to-digital conversion unit 113 and judge that the voltage of the alternating current that driver output circuit 12 input accesses is whether in default range of normal value, if the voltage of the alternating current of driver output circuit 12 input access is greater than default normal value, then calculation control unit 111 controls alarm unit 112 and sends overtension warning.Wherein, calculate the current value of resonant element according to the digital signal of analog-to-digital conversion unit 113 output, calculating the magnitude of voltage of resonant element according to relevant parameter, i.e. the magnitude of voltage of driver output circuit 12 resonant element.
Calculating control circuit 11 is also connected with load blocks 2, calculation control unit 111 is also for judging whether open circuit or short circuit according to the calculation of parameter of load blocks 2 detected, if load blocks 2 is opened a way, then calculation control unit 111 controls alarm unit 112 and sends open circuit warning, if load blocks 2 short circuit, then calculation control unit 111 controls alarm unit 112 and sends short-circuit alarming.
Servo heating system also comprises time controller 4, and time controller 4 can be connected in series the gear signal for controlling induction power supply or control the break-make of induction power supply 380V power supply with the coil tandem of A.C. contactor with temp controlled meter.For control induction power supply preset time period work or do not work.
As shown in Figure 2, the workflow of servo heating system of the present utility model is as follows:
To servo heating system electrifying startup, and initiation parameter, and judge induction power supply 1, load blocks 2, connection between temperature control module 3 and time controller 4 whether normally and whether can normally work.
Judge whether servo heating system has gear, namely judge the condition of the work that meets, if do not have gear, then this servo heating system switches to holding state, when there being gear, continues to perform following step.
Whether connect normal, and whether load blocks 2 can normally work if detecting load blocks 2, when load blocks 2 can connect normally and can normally work, continue to perform following step.
Induction power supply 1 starts, and the temperature value that temperature control modules 32 is corresponding according to setpoint power output contrasts with the temperature value detected, sends corresponding power control signal to calculating control circuit 11.Calculating control circuit 11 controls square wave to driver output circuit 12 according to the power control signal Drazin inverse received, and driver output circuit 12 output AC electricity is to load blocks 2, and the induction coil in load blocks 2 produces induced field by alternating current.Crucible in load blocks 2 produces eddy current according to induced field, heats, and meanwhile, the heat that the heat-insulation layer of crucible outer layer covers avoids in crucible distributes, and avoids the impact of hyperthermia radiation on induction coil of crucible simultaneously.
Current detection module 13 just gathers the load parameter of the alternating current of driver output circuit 12 rear class output through Preset Time, and export the load parameter collected to calculating control circuit 11, calculation control unit 111 in calculating control circuit is according to the equivalent electric sensibility reciprocal L of this load parameter computational load module 2 and equiva lent impedance, calculating control circuit 111 carries out contrast according to required setting impedance again and generates control signal and export driver output circuit 12 to, to control the alternating current of driver output circuit 12 output frequency respective frequencies.
Driver output circuit 12 output AC electricity is to the induction coil in load blocks 2, and induction coil produces induced field, to crucible heating.Simultaneously, current detection module 13 is after Preset Time, again gather the load parameter of the alternating current of driver output circuit 12 rear class output, and exporting the load parameter collected to calculating control circuit 11, calculating control circuit 11 controls the alternating current that corresponding driver output circuit 12 exports respective frequencies again.
Simultaneously, temperature detecting module 321 in temperature control modules 32 also detects the temperature of crucible in load blocks 2, and judge by control module 322 the temperature value whether temperature of crucible heats higher than the needs preset, when the temperature value that the temperature of crucible heats higher than the needs preset, control module 322 in temperature control modules 32 stops output power signal, now controlling driver output circuit 12 stops output AC electricity to the induction coil in load blocks 2, stop heating, stop scattering and disappearing of heat by the heat-insulation layer of crucible outer layer covers.
Gather by the temperature data of the crucible heated, judge that whether the temperature of crucible is lower than preset temperature value, when the temperature of crucible is lower than the temperature value preset, calculating control circuit 11 again controls driver output circuit 12 output AC electricity and heats to load blocks 2.
And, while driver output circuit 12 works, current acquisition module 14 gathers the current signal after rectification and driver output circuit 12 rear class resonant element current signal, driver output circuit 12 rear class resonant element current signal is converted into after voltage signal through the PCB that inside is arranged and exports calculating control circuit 11 to, after analog-to-digital conversion unit 113 in calculating control circuit 11 receives this voltage signal, voltage signal be converted into digital signal and export the calculation control unit 111 in calculating control circuit 11 to, calculation control unit 111 in calculating control circuit 11 judges magnitude of voltage that this current signal is corresponding whether in the range of normal value preset according to the current signal of resonant element corresponding to this digital signal, wherein by the current value of resonant element power supply and the capacitor's capacity of resonant element, operating frequency calculates the magnitude of voltage of resonant power.
When the magnitude of voltage of resonant element is not in the range of normal value preset, then calculation control unit 111 controls alarm unit 112 and sends overtension warning, remind the type of servo heating system selected by staff improper with the coil of resonant circuit, as required the type of adjustment servo heating system or coil.Simultaneously, calculation control unit 111 in calculating control circuit 11 also judges whether load blocks 2 opens a way and short circuit, if load blocks 2 is opened a way, then calculation control unit 111 controls alarm unit 112 and sends open circuit warning, if load blocks 2 short circuit, then calculation control unit 111 controls alarm unit 112 and sends short-circuit alarming.Time point set by arriving when the operating time of induction power supply 1, time controller 5 controls induction power supply 1 and disconnects, and stops heating.
In sum, servo heating system of the present utility model is by the frequency of the load parameter adjustment induction power supply 1 output AC electricity of the alternating current of the output of continuous acquisition driver output circuit 12, by controlling alternating current that induction power supply 1 exports this frequency induction coil to load blocks 2 to produce induced field, gather the frequency of the load parameter of the alternating current of the output of driver output circuit 12 alternating current of constantly adjustment induction power supply 1 output continuously, the frequency approach of the alternating current that induction power supply 1 is exported is in the natural frequency of load blocks 2, load blocks 2 carries out the power invariability heated, because load blocks 2 is being carried out in heating process, in load blocks 2, the characteristic of induction coil can change, cause the words continuing to use original FREQUENCY CONTROL output, actual heating power can change, the frequency of induction power supply 1 output AC electricity is adjusted by the load parameter of the alternating current gathering driver output circuit 12 output, the heating power preset is made to keep constant, the temperature remained constant of heating.
Above-mentioned servo heating system adopts the principle of electromagnetic induction, directly heats, compared with traditional heating mode, decrease the loss of heat in heat transfer process, improve the heat conversion of electric energy load blocks 2.Really capacity usage ratio is effectively made greatly to improve.
Secondly, distinguish whether the characteristic of load blocks 2 changes by the load parameter of the alternating current of the not output in the same time of driver output circuit 12, as changed, export different control signals, control the alternating current that induction power supply 1 exports corresponding frequencies, to realize the stability contorting of servo heating system power output, whole-process automatic control, be convenient to control, and good stability, accuracy high, can respond fast.
Certainly, the heating-up temperature that above-mentioned servo heating system also can set according to initial time and heating time, the switch and the automatic adjustment that realize the automatic control system of whole system are heated according to the heating-up temperature set.
Understandable, above embodiment only have expressed preferred implementation of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the utility model the scope of the claims; It should be noted that, for the person of ordinary skill of the art, without departing from the concept of the premise utility, independent assortment can be carried out to above-mentioned technical characterstic, can also make some distortion and improvement, these all belong to protection range of the present utility model; Therefore, all equivalents of doing with the utility model right and modification, all should belong to the covering scope of the utility model claim.
Claims (9)
1. a servo heating system, is characterized in that, comprising: temperature control module (3), induction power supply (1) and load blocks (2);
Described induction power supply (1) is connected with described temperature control module (3), and sets the setpoint power output of described induction power supply (1) by described temperature control module (3);
Described induction power supply (1) is connected with described load blocks (2) and temperature control module (3), according to described setpoint power output output AC electricity to described load blocks (2), and the output frequency of described alternating current is adjusted according to the load parameter of the described alternating current exported, mate with described setpoint power output with the power controlling to export described alternating current;
Described load blocks (2), is connected with described induction power supply (1), for receiving the alternating current that described induction power supply (1) exports, produces induced field.
2. servo heating system according to claim 1, is characterized in that, described induction power supply (1) is superaudio induction power supply;
Described load blocks (2) comprises the induction coil, the coil brace for described induction coil winding, the heat-insulation layer that is arranged on the crucible in described coil brace and is arranged between described crucible and described coil brace that are electrically connected with described induction power supply (1).
3. servo heating system according to claim 1, is characterized in that, described temperature control module (3) is temp controlled meter or PLC, comprises temperature setting module (31) and temperature control modules (32);
Described temperature setting module (31) for setting the heating-up temperature of described induction power supply (1), and obtains described setpoint power output according to described heating-up temperature; Described setpoint power output is the power output or fixing power output of mating with process temperature control curve;
Described temperature control modules (32) is connected with described temperature setting module (31), exports corresponding firm power for controlling described induction power supply (1) according to described setpoint power output.
4. servo heating system according to claim 1, is characterized in that, described induction power supply (1) comprises current detection module (13), calculating control circuit (11) and driver output circuit (12);
Described current detection module (13) is connected with the output of described driver output circuit (12), detects the load parameter of the described alternating current of described output;
Described calculating control circuit (11) is connected with described current detection module (13) and temperature control module (3), described load parameter according to detecting calculates equivalent sensibility reciprocal, equiva lent impedance, by the described equiva lent impedance calculated compared with the setting resistance value obtained according to described setpoint power output, what export corresponding frequencies controls signal to described driver output circuit (12);
Described driver output circuit (12) is connected with described calculating control circuit (11) and load blocks (2), according to the frequency of the described alternating current that described control signal adjustment exports, the power of described alternating current is mated with described setpoint power output.
5. servo heating system according to claim 1, is characterized in that, described load parameter comprises current value and/or the phase place of described alternating current.
6. servo heating system according to claim 3, is characterized in that, described temperature control modules (32) comprises temperature detecting module (321) and control module (322),
Described temperature detecting module (321), for detecting the temperature of described load blocks (2);
Described control module (322), be connected with described temperature detecting module (321) and described temperature setting module (31), export corresponding firm power for induction power supply (1) according to described setting heating and temperature control and judge that whether the described temperature of described load blocks (2) is higher than preset value, if so, then control described induction power supply (1) and stop output AC electricity.
7. servo heating system according to claim 4, is characterized in that, described induction power supply (1) inside also comprises current acquisition module (14),
Described current acquisition module (14), is connected with the output of described induction power supply (1), for gathering current signal that described induction power supply (1) exports and being converted to voltage signal and exporting;
Described calculating control circuit (11) also comprises calculation control unit (111), analog-to-digital conversion unit (113) and alarm unit (112), described analog-to-digital conversion unit (113) is connected with described current acquisition module (14), for receiving voltage signal that described current acquisition module (14) exports and being converted into digital signal and exporting;
Described calculation control unit (111) is connected with described alarm unit (112) and described analog-to-digital conversion unit (113), calculate for receiving described digital signal and judge that the voltage of the alternating current that described driver output circuit (12) input accesses is whether in the range of normal value preset, if the voltage of the alternating current of described driver output circuit (12) input access is greater than default normal value, then controls described alarm unit (112) and send overtension warning.
8. the servo heating system according to any one of claim 1-6, is characterized in that, described servo heating system also comprises time controller (4),
Described time controller (4) is connected with described induction power supply (1), for controlling described induction power supply (1) output AC electricity within the time period of presetting;
Or described time controller (4) is connected with described load blocks (2), disconnect after preset time period for controlling described load blocks (2).
9. servo heating system according to claim 7, it is characterized in that, described calculating control circuit (11) is also connected with described load blocks (2), for basis, described calculation control unit (111) also detects that the parameter of described load blocks (2) judges whether open circuit or short circuit, if so, then control described alarm unit (112) and send open circuit or short-circuit alarming.
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| CN201520500502.0U CN204761745U (en) | 2015-07-10 | 2015-07-10 | Servo heating system |
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| CN201520500502.0U CN204761745U (en) | 2015-07-10 | 2015-07-10 | Servo heating system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105050219A (en) * | 2015-07-10 | 2015-11-11 | 汪建英 | Servo heating system |
| CN107238504A (en) * | 2016-03-28 | 2017-10-10 | 上海华宇电子工程有限公司 | Simulation load box |
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2015
- 2015-07-10 CN CN201520500502.0U patent/CN204761745U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105050219A (en) * | 2015-07-10 | 2015-11-11 | 汪建英 | Servo heating system |
| CN107238504A (en) * | 2016-03-28 | 2017-10-10 | 上海华宇电子工程有限公司 | Simulation load box |
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Effective date of registration: 20160818 Address after: 5, building 518000, building A8, Peking University Founder science park, Shenzhen, Baoan District, Guangdong Patentee after: SHENZHEN ZENEN ELECTRONIC TECHNOLOGY CO., LTD. Address before: 3, building 518000, building A8, Peking University Founder science park, Shenzhen, Baoan District, Guangdong Patentee before: Wang Jianying |