CN104950946A - Heat radiation control system of high-voltage frequency converter - Google Patents
Heat radiation control system of high-voltage frequency converter Download PDFInfo
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- CN104950946A CN104950946A CN201410365052.9A CN201410365052A CN104950946A CN 104950946 A CN104950946 A CN 104950946A CN 201410365052 A CN201410365052 A CN 201410365052A CN 104950946 A CN104950946 A CN 104950946A
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Abstract
The invention relates to an intelligent heat radiation control system of a high-voltage frequency converter. The control system comprises a cooling fan group of a high-voltage frequency converter, a frequency-conversion speed-regulation fan control device for speed regulation of the cooling fan group, and sensors for measuring temperatures of all components of the high-voltage frequency converter. The frequency-conversion speed-regulation fan control device adjusts rotating speeds of fans according to cooling requirements of all components of the high-voltage frequency converter, thereby reducing fan energy losses, prolonging the service life of the fans, and reducing the fan noises in a low-load or low-environment-temperature mode of the high-voltage frequency converter. When a fault occurs at the low-voltage small-power frequency converter of the frequency-conversion speed-regulation fan control device, switching of the fan group to the power-frequency power supply can be realized by using a fan bypass control module, thereby increasing fan control redundant backup and improving the system reliability.
Description
Technical field
The present invention relates to a kind of high voltage converter cooling control system, particularly control rotation speed of the fan by high voltage converter load variations, and by high voltage converter each part temperatures correction rotation speed of the fan, make the control device that each part temperatures of high voltage converter is constant.
Background technology
At present for the heat dissipation design of high voltage converter, be all by Air flow usually, utilize air to flow and arrive radiating effect.Tradition is applied to the heat abstractor of high voltage converter, all use ac fan, the power frequency supply that ac fan power supply is generally voltage U, frequency f is fixed, rotation speed of the fan n, n=60f (1-s)/p, in formula, s is revolutional slip, p is motor number of pole-pairs, and supply frequency f fixes, and namely rotation speed of the fan n fixes.This fan attachment rotating speed meets the radiating requirements of high voltage converter when peak load, most high ambient temperature.Fan belongs to and square subtracts torque load(ing), and air quantity is directly proportional to rotating speed first power, and fan electromotor Torque and speed square is directly proportional, and fan electromotor shaft power is directly proportional to rotating speed cube, and rotation speed of the fan is lower, and fan electromotor power consumption is less.When high voltage converter is in low load condition or low ambient temperature, only need very little ventilation can meet the radiating requirements of high voltage converter, the driving that fan is subject to power frequency supply can maintain fixing rotation speed operation, increase power consumption when low load condition or low ambient temperature, cause energy dissipation, because fan runs up, produce the problem such as noise, fan spindle bearing reduced lifetime.
Fan protection is generally threaded off by air-break and is protected or electrothermal relay delay protection, and protection error is large, poor sensitivity, after fan breaks down, easily causes failure propagation.Fan control generally controls fan running by a contactor, and when fan control system breaks down, control system is irredundant, and fan shuts down, and causes high voltage converter Thermal protection to shut down.Fan turns to be determined according to power phase, if power phase changes, fan is reversed, causes radiating effect obviously to decline, can not meet radiating requirements.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of control system for high voltage converter heat radiation, by high voltage converter spatial load forecasting rotation speed of the fan, and pass through the radiating requirements correction rotation speed of the fan of each parts of high voltage converter, make each parts temperature rise of high voltage converter remain on a steady state value.
For solving the problems of the technologies described above, the present invention is used for high voltage converter cooling control system and comprises: control transformer cabinet fan group and power cabinet fan group are run, stopped, and regulate the frequency control fan control device of rotation speed of the fan; The low pressure Small-power Inverter of frequency control fan control device, is connected with external ac power source, and the alternating voltage that output frequency, amplitude are adjustable; Be configured at the transformer temperature sensor of transformer case in high voltage converter, and the power cell temperature sensor of power unit cabinet.The fan bypass control module of this frequency control fan control device, be connected with transformer case fan group, power cabinet fan group, low pressure Small-power Inverter and external ac power source, wherein transformer case fan group, the assembly of power cabinet fan are placed in needs heat radiation place of high voltage converter.
As a preferred embodiment of the present invention, described low pressure Small-power Inverter is provided with the parameter needed for high voltage converter heat radiation, and detects that the temperature of self each parts and actual load control rotation speed of the fan according to high voltage converter.
As another kind of preferred version of the present invention, described transformer case fan group and power cabinet fan group are respectively configured by the ac fan of one or more same sizes and form.
As another preferred version of the present invention, the check point quantity of described transformer temperature sensor (211) and power cell temperature sensor (311) and position, set according to mechanism design or radiating requirements by user, measured temperature comprises transformer coil temperature, transformer core temperature; Igbt (IGBT) temperature of power cell, rectifier bridge temperature, capacitance temperature.
As the further preferred version of the present invention, described high voltage converter actual load comprises input current, power input, output current, output power.
As another preferred version of the present invention, described frequency control fan control device comprises the low pressure Small-power Inverter of AC-DC-ac conversion circuit.
As the present invention's further preferred version, the fan bypass control module of described frequency control fan control device comprises transformer case fan group and power cabinet fan group power supply switch circuit.
Owing to monitoring the operation conditions of each fan, thus realize the warning reminding to each monitoring fan abnormal condition, avoid shutdown outside the plan, locked fan and turned to.For the frequency converter ac fan of prior art controls, improve fan speed-regulating control performance and power consumption, extend the fan spindle bearing life-span, for user provides easy, intelligent, is easy to the high voltage converter fan control device of configuration.Above-mentioned preferred version simplifies cooling control system structure, reduces manufacturing cost, makes fan overall energy consumption remain on a reduced levels.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation:
Fig. 1 is invention unit multiple-level serially connected high voltage converter circuit theory schematic diagram.
Fig. 2 is cell series multi-level converter group cabinet panel front view, and the left side is transformer case, and the remaining right side is power cabinet.
Fig. 3 is the group of high voltage converter shown in Fig. 2 cabinet left view, signal turnover heat dissipation channel.
Fig. 4 is prior art fan control device circuit theory schematic diagram.
Fig. 5 is the circuit theory schematic diagram of frequency control fan control device of the present invention.
Fig. 6 is the circuit theory schematic diagram that Fig. 5 decomposes fan bypass control module.
Fig. 7 is the functional-block diagram of preferred embodiment of the present invention high voltage converter cooling control system.
Fig. 8 is the functional-block diagram of Fig. 7 decomposition pressure swing device cabinet fan group rotational speed regulation.
Fig. 9 is the functional-block diagram that Fig. 7 decomposes power cabinet fan group rotational speed regulation.
Figure 10 is the functional-block diagram of the present invention's another preferred embodiment frequency control fan control device.
Figure 11 is the functional-block diagram of Figure 10 decomposition pressure swing device cabinet fan group and power cabinet fan group rotational speed regulation.
Embodiment
Fig. 1 is cell series multi-level converter principle schematic, and electrical network input provides multiple secondary voltage to export through phase-shifting transformer 21, powers to respectively power cell 31, then is the mode that a phase exports by multiple power cell 31 series connection, forms three-phase and exports; PWM Generator High Voltage Inverter Control System 4 exports by the PWM controlling power cell 31 frequency and the amplitude that control high voltage converter 1 output voltage, thus reaches the object controlling motor speed.Carry out communication by optical fiber between PWM Generator High Voltage Inverter Control System 4 and power cell 31, both ensured the transmitting of signal, ensure that PWM Generator High Voltage Inverter Control System 4 is isolated with the insulation of high-pressure section simultaneously.The major heat producing components of high voltage converter 1 is phase-shifting transformer 21 and power cell 31, usually phase-shifting transformer 21 is contained in a cupboard, composition transformer case 2, power cell 31 is contained in inside one or more cupboards, composition power cabinet 3, is shown in Fig. 2 high voltage converter group cabinet panel front view.Also can phase-shifting transformer 21 and power cell 31 be contained in inside a cupboard, composition high voltage converter 1.
Fig. 3 is high voltage converter heat dissipation wind channel schematic diagram, and be the left view of Fig. 2, fan exhausting forces air to flow, it is inner that cold air enters high voltage converter 1 by air inlet 11, the heat of heat generating components is by air fluid interchange, and hot-air is discharged to outdoor by air outlet 15, with physical environment heat interchange.Transformer case fan group 6 makes cold air enter transformer case 2 by transformer case air inlet 12, the phase-shifting transformer 21 in cooling Fig. 1, and hot-air is discharged by transformer case air outlet 16; Power cabinet fan group 7 makes cold air by power cabinet air inlet 13 ingoing power cabinet 3, the power cell 31 in cooling Fig. 1, and hot-air is discharged by power cabinet air outlet 17; Transformer case 2 is relatively independent with the air channel of power cabinet 3, is independent of each other by air quantity between transformer case 2 and power cabinet 3.When frequency control fan control device 5 controls fan, be convenient to the minimum speed regulating transformer case fan group 6, power cabinet fan group 7 respective, maintain phase-shifting transformer 21 and power cell 31 temperature constant.When phase-shifting transformer 21, power cell 31 share a fan group heat radiation, need, by deadening device, to distribute the air quantity between phase-shifting transformer 21 and power cell 31.
Fig. 4 is prior art fan control device circuit theory schematic diagram, and air-break QF closes, access power supply, and fan running is controlled by contactor KM, after PWM Generator High Voltage Inverter Control System 4 sends fan run signal 405, and contactor KM adhesive, fan runs; After PWM Generator High Voltage Inverter Control System 4 cancels fan run signal 405, contactor KM disconnects, and fan stops.Fan is that 50Hz/60Hz power frequency supply drives by frequency, rotation speed of the fan n, n=120f (1-s)/p, in formula, S is revolutional slip, and p is motor number of pole-pairs, and supply frequency f fixes, namely rotation speed of the fan n fixes, and this fan attachment rotating speed meets the radiating requirements of high voltage converter 1 when peak load, most high ambient temperature.Fan square subtracts torque load(ing), and air quantity is directly proportional to rotating speed, and fan electromotor Torque and speed square is directly proportional, and fan electromotor shaft power is directly proportional to rotating speed cube, and rotation speed of the fan is lower, and fan electromotor power consumption is less.When high voltage converter 1 is in low load condition or low ambient temperature, only need very little ventilation can meet the radiating requirements of high voltage converter 1, the driving that fan is subject to power frequency supply can maintain fixing rotation speed operation, increase power consumption when low load condition or low ambient temperature, cause a large amount of waste of energy.Fan is higher at a high speed, and generation noise is larger, fan is shorter for mechanical life.Fan protection generally transships delay protection by the protection of air-break QF overcurrent tripping or electrothermal relay FR, and protection value error is large, and protection sensitivity is poor, can not available protecting fan electromotor, causes fan electromotor to burn, makes failure propagation.Fan control controls fan running by contactor KM, and when contactor KM system malfunctions, control system is irredundant, and fan shuts down, and causes high voltage converter 1 Thermal protection to shut down.Fan turns to be determined according to power phase, if power phase changes, fan is reversed, causes radiating effect obviously to decline, can not meet high voltage converter radiating requirements, make high voltage converter Thermal protection, cause shutdown outside the plan.Whether need manual confirmation fan to turn to correct, complex operation, increases handling cost.
Fig. 5 is frequency control fan control device circuit theory schematic diagram of the present invention, by single or multiple frequency control fan control device 5, forms whole high voltage converter cooling control system.Frequency control fan control device 5 is made up of low pressure Small-power Inverter 51 and fan bypass control module 53, low pressure Small-power Inverter 51, pass through ac-dc-ac transform, after the AC power rectification of input, filtering, obtain direct current, direct current is exported by inverter circuit PWM, obtain the AC power that voltage u, frequency f are variable, u/f=C, in formula, C is constant.Rotation speed of the fan n, n=60f (1-s)/p, in formula, S is revolutional slip, and p is motor number of pole-pairs, by low pressure Small-power Inverter 51 drive fan, changes the frequency f of low pressure Small-power Inverter 51 output voltage, can realize rotation speed of the fan and regulate.
As shown in Fig. 6 composition graphs 5, contactor KM1 and KM2 forms the fan bypass control module 53 of frequency control fan control device 5, and contactor KM1 and KM2 interlocks, and can only close one of them, avoids because KM1, KM2 close simultaneously, damages low pressure Small-power Inverter 51.When low pressure Small-power Inverter 51 normally works, low pressure Small-power Inverter failure bypass control signal 513 is invalid, 513 often disconnect battle (NO), KM2 contactor disconnects, 513 normally closed points (NC) close, KM1 contactor closes, and fan is driven by low pressure Small-power Inverter 51, and fan frequency control runs.After low pressure Small-power Inverter 51 hinders, 513 normally closed points (NC) disconnect, and KM1 contactor disconnects, and 513 often close battle (NO), and KM2 contactor closes, and fan is switched to power frequency loop.After low pressure Small-power Inverter 51 fault of frequency control fan control device 5, automatically fan is switched to power frequency loop by fan bypass control module 53, fan works on, and realizes fan control redundancy backup, adds system reliability.Low pressure Small-power Inverter 51 can lock output voltage phase sequence, thus locking fan turns to.Low pressure Small-power Inverter 51 output voltage phase sequence and input power phase sequence have nothing to do, and avoid causing fan to reverse because power phase changes, and the situation that radiating effect is obviously declined occurs.Low pressure Small-power Inverter 51 passes through high speed microprocessor; monitoring fan-status; after the faults such as fan overload, overheated, phase shortage occur; according to fault category; light fault sends out alerting signal, reminds staff to overhaul in time, and heavy fault can block output rapidly; protection fan, avoids failure propagation.And failure message is stored, conveniently look into repair and maintenance.During low pressure Small-power Inverter 51 starting fan, rotation speed of the fan increases gradually from zero, and start steadily, mechanical is impacted, and extend fan life, fan can frequent start-stop.
Fig. 7 is the functional-block diagram of one embodiment of the invention, transformer temperature sensor 211 is configured at each phase winding coil, the iron core of phase-shifting transformer 21 in Fig. 1, temperature controller 23 gathers each phase winding coil, the iron core temperature of phase-shifting transformer 21 by sensor 211, and the temperature value detected is uploaded to PWM Generator High Voltage Inverter Control System 4.Power cell temperature sensor 311 is configured at the heating radiator of power cell 31, and power cell 31 gathers IGBT, the rectifier bridge equitemperature of power cell 31 by sensor 311, and the temperature value detected is uploaded to PWM Generator High Voltage Inverter Control System 4.High voltage converter load value 401, transformer temperature detected value 402, fan run signal 405 are given the low pressure Small-power Inverter 51 of the first frequency changing regulating speed control apparatus by PWM Generator High Voltage Inverter Control System 4, low pressure Small-power Inverter run signal 511, low pressure Small-power Inverter fault-signal 512 are fed back to PWM Generator High Voltage Inverter Control System 4 by the low pressure Small-power Inverter 51 of the first frequency changing regulating speed control apparatus, and the first frequency changing regulating speed control apparatus driving transformer cabinet fan group 6 frequency control runs.High voltage converter load value 401, power cell temperature detection value 403, fan run signal 405 are given the low pressure Small-power Inverter 51 of the second frequency changing regulating speed control apparatus by PWM Generator High Voltage Inverter Control System 4, low pressure Small-power Inverter run signal 511, low pressure Small-power Inverter fault-signal 512 are fed back to PWM Generator High Voltage Inverter Control System 4 by the low pressure Small-power Inverter 51 of the second frequency changing regulating speed control apparatus, and the second frequency changing regulating speed control apparatus driving power cabinet fan group 7 frequency control runs.PWM Generator High Voltage Inverter Control System 4 monitors the running status of first, second frequency changing regulating speed control apparatus according to low pressure Small-power Inverter run signal 511, low pressure Small-power Inverter fault-signal 512.
Illustrated equally by Fig. 1, Fig. 7, Fig. 8 and Fig. 9, the major heat producing components of high voltage converter 1 is phase-shifting transformer 21 and power cell 31, phase-shifting transformer 21 is directly proportional to the load of high voltage converter to the thermal value of power cell 31, high voltage converter load value 401 is larger, phase-shifting transformer 21 is higher with the thermal value of power cell 31, required ventilation is larger, and rotation speed of the fan is higher.Phase-shifting transformer 21 heating is mainly coil resistance loss, power cell 31 generates heat for power semiconductor conduction loss, switching loss, the thermal value of two parts is different, in order to accurately control phase-shifting transformer 21 and the temperature of power cell 31, need to carry out independent speed governing by first, second frequency changing regulating speed control apparatus to transformer case fan group 6, power cabinet fan group 7.
After high voltage converter 1 starts, the low pressure Small-power Inverter 51 that PWM Generator High Voltage Inverter Control System 4 controls first, second frequency changing regulating speed control apparatus by fan run signal 405 starts, first frequency changing regulating speed control apparatus driving transformer cabinet fan group 6 frequency control runs, and the second frequency changing regulating speed control apparatus driving power cabinet fan group 7 frequency control runs.
The low pressure Small-power Inverter 51 of the first frequency changing regulating speed control apparatus uses high voltage converter load value 401 as rotation speed of the fan set-point, transformer temperature setting value (100 DEG C) is given as PID, transformer temperature detected value 402 does PID negative feedback, PID output valve is as rotation speed of the fan modified value, rotation speed of the fan set-point superposes with rotation speed of the fan modified value, obtain revised rotating speed, transformer case fan group 6 is run by revised rotating speed.
The low pressure Small-power Inverter 51 of the second frequency changing regulating speed control apparatus uses high voltage converter load value 401 as rotation speed of the fan set-point, power cell desired temperature (60 DEG C) is given as PID, power cell temperature detection value 403 does PID negative feedback, PID output valve is as rotation speed of the fan modified value, rotation speed of the fan set-point superposes with rotation speed of the fan modified value, obtain revised rotating speed, power cabinet fan group 7 is run by revised rotating speed.
High voltage converter load value 401 is less, phase-shifting transformer 21 is less with power cell 31 thermal value, required ventilation is less, needed for transformer case fan group 6, power cabinet fan group 7, rotating speed is lower, by high voltage converter load value 401 as rotation speed of the fan set-point, the rotating speed of fan changes according to high voltage converter load value 401 and changes.When environment temperature is lower, when ventilation and high voltage converter load value 401 are fixed, phase-shifting transformer 21 and power cell 31 thermal value are fixed, and phase-shifting transformer 21 is also lower with the temperature of power cell 31.When transformer temperature detected value 402 is lower than transformer temperature setting value (100 DEG C), PID exports reduction, and the rotating speed of revised transformer case fan group 6 reduces; When transformer temperature detected value 402 is higher than transformer temperature setting value (100 DEG C), PID exports increase, the rotating speed of revised transformer case fan group 6 increases, and PID controls the rotating speed revising transformer case fan group 6, makes the temperature of phase-shifting transformer 21 remain on setting value.When power cell temperature detection value 403 is lower than power cell desired temperature (60 DEG C), PID exports reduction, and the rotating speed of revised power cabinet fan group 7 reduces; When power cell temperature detection value 403 is higher than power cell desired temperature (60 DEG C), PID exports increase, and the rotating speed of revised power cabinet fan group 7 increases, and PID controls to revise rotation speed of the fan, makes the temperature of power cell 31 remain on setting value.By high voltage converter load value 401 as rotation speed of the fan set-point, PID controls to revise rotation speed of the fan, revised rotation speed of the fan ensures that the temperature of phase-shifting transformer 21, power cell 31 is when different loads and environment temperature, all keep temperature constant, make the running speed of transformer case fan group 6, power cabinet fan group 7 optimum, reduce the rotation speed of the fan of high voltage converter 1 when low load condition or low ambient temperature.The power of fan electromotor axle and rotating speed cube claim direct ratio, rotation speed of the fan is lower, fan electromotor shaft power is less, and rotation speed of the fan is lower, and noise is less, fan is longer for mechanical life, while reducing rotation speed of the fan, reduce noise, extend fan life, at utmost reduce the power consumption of fan, thus provide more energy-conservation high voltage converter cooling control system for user.
Figure 10 and Figure 11 is the functional-block diagram of another preferred embodiment of the present invention, embodiment above, according to different heat generating components phase-shifting transformers 21, power cell 31, first, second frequency control fan control device 5 is needed to carry out rotating speed control to corresponding fan group, guarantee phase-shifting transformer 21 and the temperature constant of power cell 31, make cost increase.The present embodiment only uses a variable frequency regulating speed control fan assembly 5, simultaneously control transformer cabinet fan group 6 and power cabinet fan group 7.The low pressure Small-power Inverter 51 of frequency changing regulating speed control apparatus 5 uses high voltage converter load value 401 as rotation speed of the fan set-point, transformer temperature setting value (100 DEG C) is given as PID, transformer temperature detected value 402 does PID negative feedback, PID output valve is as rotation speed of the fan modified value, rotation speed of the fan set-point superposes with rotation speed of the fan modified value, obtain revised rotating speed, revised rotation speed of the fan ensures that the temperature of phase-shifting transformer 21 is when different loads and environment temperature, all keeps temperature constant.
The major heat producing components of high voltage converter 1 is phase-shifting transformer 21 and power cell 31, and phase-shifting transformer 21 heating is mainly coil resistance loss, thermal value to flow through square being directly proportional of transformer current; Power cell 31 generates heat for power semiconductor conduction loss, switching loss, and thermal value is directly proportional to the electric current flowing through power cell 31; The loss of phase-shifting transformer 21 is much larger than the loss of power cell 31.When rotation speed of the fan can meet phase-shifting transformer 21 radiating requirements, because transformer case fan group 6 is identical with the rotation speed of the fan of power cabinet fan group 7, power cell 31 radiating requirements also can meet, and makes the temperature of power cell 31 remain on a relatively low temperature.By number of fans, the fan size of allocating power cabinet fan group 7, optimal ventilation amount can be regulated, makes the energy consumption of power cabinet fan group 7 keep a relatively low level.
The foregoing is only the preferred embodiments of the present invention, not thereby namely limit the scope of the claims of the present invention, every other equivalent transformations of doing in characteristic range of the present invention or modification, all should be included in the scope of the claims of the present invention.
Claims (8)
1. a cooling control system for high voltage converter, it comprises high voltage converter (1) and is connected with the low pressure Small-power Inverter (51) of frequency control fan control device (5), gives low pressure Small-power Inverter (51) actual load; Be configured at the transformer temperature sensor (211) of high voltage converter (1) interior transformer case (2), and the power cell temperature sensor (311) of power unit cabinet (3).
2. it is characterized in that:
Described frequency control fan control device (5) is run for control transformer cabinet fan group (6) and power cabinet fan group (7), is stopped, and regulates rotation speed of the fan, comprising:
-low pressure Small-power Inverter (51), is connected with external ac power source, and the alternating voltage that output frequency, amplitude are adjustable;
-fan bypass control module (53), is connected with described transformer case fan group (6), power cabinet fan group (7), low pressure Small-power Inverter (51) and external ac power source.
3. the cooling control system of high voltage converter according to claim 1, it is characterized in that: described low pressure Small-power Inverter (51) is provided with the parameter needed for high voltage converter (1) heat radiation, and detects that the temperature of self each parts and actual load control rotation speed of the fan according to high voltage converter (1).
4. the cooling control system of high voltage converter according to claim 1, is characterized in that: described transformer case fan group (6) and power cabinet fan group (7) are respectively configured by the ac fan of one or more same sizes and form.
5. the cooling control system of high voltage converter according to claim 1, it is characterized in that: the check point quantity of described transformer temperature sensor (211) and power cell temperature sensor (311) and position, set according to mechanism design or radiating requirements by user, measured temperature comprises transformer coil temperature, transformer core temperature; Igbt (IGBT) temperature of power cell, rectifier bridge temperature, capacitance temperature.
6. the cooling control system of high voltage converter according to claim 1 and 2, is characterized in that: described high voltage converter (1) actual load comprises input current, power input, output current, output power.
7. the cooling control system of high voltage converter according to claim 1, is characterized in that: described frequency control fan control device (5) comprises the low pressure Small-power Inverter (51) of AC-DC-ac conversion circuit.
8. the cooling control system of the high voltage converter according to claim 1 or 6, is characterized in that: the fan bypass control module (53) of described frequency control fan control device (5) comprises transformer case fan group (6) and power cabinet fan group (7) power supply switch circuit.
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| CN201410365052.9A CN104950946A (en) | 2014-07-29 | 2014-07-29 | Heat radiation control system of high-voltage frequency converter |
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| CN201410365052.9A CN104950946A (en) | 2014-07-29 | 2014-07-29 | Heat radiation control system of high-voltage frequency converter |
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| CN109219314A (en) * | 2018-08-21 | 2019-01-15 | 泰豪科技股份有限公司 | A kind of radiating circuit and system |
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| CN111056471A (en) * | 2020-03-03 | 2020-04-24 | 宝鸡巨菱钻采设备有限责任公司 | Lifting device for oil drilling machine based on alternating-current variable-frequency electric winch |
| CN112086964A (en) * | 2020-09-07 | 2020-12-15 | 易事特集团(河南)有限公司 | AC power supply system |
| CN112611039A (en) * | 2020-12-14 | 2021-04-06 | 青岛海信日立空调系统有限公司 | Air conditioner and control method |
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| CN114242489A (en) * | 2021-11-01 | 2022-03-25 | 中国长江三峡集团有限公司 | Distributed modulation type forced air cooling method of solid-state direct-current circuit breaker |
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| CN109219314A (en) * | 2018-08-21 | 2019-01-15 | 泰豪科技股份有限公司 | A kind of radiating circuit and system |
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| CN111056471A (en) * | 2020-03-03 | 2020-04-24 | 宝鸡巨菱钻采设备有限责任公司 | Lifting device for oil drilling machine based on alternating-current variable-frequency electric winch |
| CN112086964A (en) * | 2020-09-07 | 2020-12-15 | 易事特集团(河南)有限公司 | AC power supply system |
| CN112611039A (en) * | 2020-12-14 | 2021-04-06 | 青岛海信日立空调系统有限公司 | Air conditioner and control method |
| CN112954978A (en) * | 2021-02-25 | 2021-06-11 | 台州市菱士达电器有限公司 | Intelligent energy-saving frequency converter control system |
| CN114242489A (en) * | 2021-11-01 | 2022-03-25 | 中国长江三峡集团有限公司 | Distributed modulation type forced air cooling method of solid-state direct-current circuit breaker |
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Application publication date: 20150930 |