Chapter 3. Heat Dissipation Design Method
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1 hapter 3 Heat Dissipati Design Method tents Page 1. Power dissipati loss calculati Method of selecting a liquid cooling jacket Method of mounting the IGBT module This chapter describes heat dissipati design. To operate the IGBT safely, it is necessary not to allow the juncti temperature (Tj) to exceed Tjmax. Perform thermal design with sufficient allowance in order not for Tjmax. to be exceeded not ly in the operati under the rated load but also in abnormal situatis such as overload operati. 3-1
2 3. 1. Power dissipati loss calculati In this secti, the simplified method of calculating power dissipati for IGBT modules is explained. In additi, an IGBT loss simulator is available the Fuji Electric WEB site ( It helps to calculate the power dissipati and thermal design for various working cditi with various Fuji IGBT modules. 1.1 Types of power loss The IGBT module csists of several IGBT dies and FWD dies. The sum of the power losses from these dies equals the total power loss for the module. Power loss can be classified as either -state loss or switching loss. A diagram of the power loss factors is shown as follows. Power loss factors Total power loss of IGBT module (Ptotal) Transistor loss (PTr) FWD loss (PFWD) On-state loss (Psat) Switching loss (Psw) On state loss (PF) Turn- loss (P) Turn-off loss (Poff) Switching loss (reverse recovery) The -state power loss from the IGBT and FWD elements can be calculated using the output characteristics, and the switching losses can be calculated from the switching loss vs. collector current characteristics the datasheet. Use these power loss calculatis in order to design a suitable cooling system to keep the juncti temperature Tj below the maximum rated value. The -state voltage and switching loss values at standard juncti temperature (Tj=150 o ) is recommended for the calculati. Please refer to the module specificati sheet for these characteristics data. 3-
3 1. Power dissipati loss calculati for sinusoidal VVVF inverter applicati 1 Basic wave 0-1 Output current I I M I M φ π π 3π π IGBT chip current (Ic) I M FWD chip current (IF) I M Fig.3-1 PWM inverter output current In case of a VVVF inverter with PWM ctrol, the output current and the operati pattern are kept changing as shown in Fig.3-1. Therefore, it is helpful to use a computer calculati for detailed power loss calculati. However, since a computer simulati is very complicated, a simplified loss calculati method using approximate equatis is explained in this secti. Prerequisites For approximate power loss calculatis, the following prerequisites are necessary: Three-phase PWM-ctrol VVVF inverter for with ideal sinusoidal current output PWM ctrol based the comparis of sinusoidal wave and saw tooth waves On-state power loss calculati (Psat, PF) As displayed in Fig.3-, the output characteristics of the IGBT and FWD have been approximated based the data ctained in the module specificati sheets. 3-3
4 On-state power loss in IGBT chip (P sat ) and FWD chip (P F ) can be calculated by following equatis: ( P ) sat = DT x 0 I V E ( sat ) 1 = DT I MV π dθ O + I M R I or I F (A) V 0 R V E(sat) =V 0 +R I V F =V 0 +R I F V E or V F (V) 1 ( P ) = DF I V + I R F M O M π DT, DF: Average -state ratio of the IGBT and FWD at a half-cycle of the output current. (Refer to Fig.3-3) Fig. - Approximate output characteristics ductivity:dt,df IGBT chip: DT 0.4 FWD chip: DF Power factor: cos Φ Fig.3-3 Relatiship between power factor sine-wave PWM inverter and cductivity 3-4
5 Switching loss calculati The characteristics of switching loss vs. I as shown in Fig.3-4 are generally approximated by using following equatis. E = E / off ' off ' ( I ratedi ) a E = E / rr rr' ( I ratedi ) b E = E / ( I ratedi ) c a, b, c: Multiplier E, E off, E rr : E, E off and E rr at rated I Switching loss (J) Eoff E Err Rated I I (A) Fig.3-4 Approximate switching losses The switching losses can be represented as follows: Turn- loss (P) P = fo n ( E ) K = 1 k 1 = foe ' rated I n = foe ' rated I 1 = foe ' rated I n ( I a ) k = 1 ni 1 I M = fce ' rated I 1 = fce ( I M ) a a a π n : Half cycle switching count = M a π 0 a k I M a sinθdθ fc fo E(IM):Ic= E at IM Turn-off loss (Poff) P off 1 = fce off ( I ) M 3-5
6 Eoff(IM):Ic= Eoff at IM FWD reverse recovery loss (Prr) P off 1 fce rr ( I ) M E rr when E rr (I M ):I = I M Total power loss Using the results obtained in secti 1.. IGBT chip power loss: FWD chip power loss: P = P + P + P Tr FWD sat F P = P + P rr off The D supply voltage, gate resistance, and other circuit parameters will differ from the standard values listed in the module specificati sheets. Nevertheless, by applying the instructis of this secti, the actual values can easily be calculated. 3-6
7 . Method of selecting a liquid cooling jacket The electrode terminals and the mounting base of the automotive IGBT power modules (6MBI400VW-065V/6MBI600VW-065V) are insulated, it is easy for mounting and compact wiring. It is important to select an appropriate liquid-cooling jacket because it is necessary to dissipate the heat generated at each device during operati for safety operati of the module. The basic ccept in selecting a liquid cooling jacket is described in this secti..1 Thermal equati in steady state Thermal cducti of IGBT module can be represented by an electrical circuit. In this secti, in the case ly e IGBT module mounted to a heat sink is csidered. This case can be represented by an equivalent circuit as shown in Fig. 3-5 thermally. From the equivalent circuit shown in Fig. 3-5, the juncti temperature (Tj) can be calculated using the following thermal equati: { Rth( j win } Twin Tj = W ) + where, the inlet coolant temperature T win is represents the temperature at the positi shown in Fig As shown in Fig. 3-6, the temperature at points other than the relevant point is measured low in actual state, and it depends the heat dissipati performance of the water jacket. Please be designed to be aware of these. W : Module power loss T j : Juncti temperature if IGBT chip T win : ooling water temperature Rt h(j-win) : Thermal resistance between juncti and cooling water Fig. 3-3 Thermal resistance equivalent circuit 3-7
8 Twin: ooling water inlet temperature Fig. 3-4 ooling water inlet temperature. Thermal equatis for transient power loss calculatis Generally, it is enough to calculate Tj in steady state from the average loss calculated as described previous secti. In actual situatis, however, actual operati has temperature ripples as shown in Fig. 3-7 because repetitive switching produce pulse wave power dissipati and heat generati. In this case, csidering the generated loss as a ctinuous rectangular-wave pulse having a certain cycle and a peak value, the temperature ripple peak value (Tjp) can be calculated approximately using a transit thermal resistance curve shown in the specificati (Fig. 3-8). t1 t1 Tjp Twin = P R( ) + 1 R ( t 1 + t ) R ( t ) + R ( t 1) t t Select a water jacket by checking that this Tjp does not exceed Tjmax. Twin Tw Fig. 3-5 Temperature ripple 3-8
9 R( ) R(t1+t) R(t) R(t1) t1 t t1+t Fig. 3-6 Transit thermal resistance curve 3. Method of mounting the IGBT module 3.1 Method of mounting the module to the liquid-cooling jacket By mounting the automotive IGBT module to a liquid-cooling jacket and directly cooling it with cooling water, the thermal resistance can be suppressed to lower than the cvential structure which IGBT module is mounted to a heat sink and cooled by air. Figure 3-9 is the outline drawing of the module with pin-fin baseplate. The fin base is made of a nickel (Ni)-plated copper (u) material. Please make sure not to damage the nickel plating, pin-fins and surface of the base plate when mounting the module. Especially scratches the base surface might cause a liquid leakage. Please note following points when you design a liquid-cooling jacket: Flow path and pressure loss Selecti of cooling liquid learance between the pin-fin and the cooling jacket Selecti of O-ring 3-9
10 Magnified view of part A 331 Pin ピン 331 6MBI400VW-065V Magnified view of part A 493 Pin ピン 493 6MBI600VW-065V Fig. 3-7 Outline drawing of the fin 3-10
11 3.1.1 Flow path and pressure loss The liquid-cooling jacket should be designed with attenti to the flow path of coolant because the pressure loss and chip temperature are varied by the state of flow path. As shown in Fig. 3-10, if the coolant flows in a major (lg) axis of the pin-fin area (Directi 1), the pressure loss is higher. Meanwhile, if the coolant flows in a minor (short) axis of the pin-fin area (Directi ), the pressure loss is lower. Regarding chip temperature, the variati of chip temperature can be suppressed if the coolant is fed in Directi rather than Directi 1. Fig. 3-8 Dependency of pressure loss flow path Fig. 3-9 Dependency of chip temperature flow path 3-11
12 3.1. Selecti of cooling liquid A mixed liquid of water and ethylene glycol is a suitable coolant for the direct liquid-cooling system. As cooling liquid, 50% of lg life coolant (LL) aqueous soluti is recommended. Impurities ctained in the coolant cause a clogging of flow path, and increasing pressure loss and decreasing cooling performance. Please eliminate impurities as much as possible. In additi, if the ph value of the coolant is low, the nickel plating may be corroded. To prevent the corrosi of fin base of the IGBT module, it is recommended to mitor the ph buffer soluti and the corrosi inhibitor in the coolant periodically to keep these ccentratis over the value which recommended by the LL manufacturer. Replenish or replace the ph buffer agent and the corrosi inhibitor before their ccentrati decreases to the recommended reference value or lower learance between the pin fin and the cooling jacket Figure 3-1 shows the thermal resistance and pressure loss dependences the gap between the tip of the pin-fin and the bottom of liquid-cooling jacket. If the gap becomes larger, the pressure loss is smaller. However, the thermal resistance becomes higher because the coolant flows through the gap unnecessarily. The recommended gap length is 0.5 mm. If the gap between the side of the pin fin and the side wall of the cooling jacket is too large, the coolant flows unnecessarily flow path, thus decreasing cooling performance. Perform design so that the gap becomes as small as possible. Pin fin (Ni plating) Gap Water jacket Fig Relati between the gap and pressure loss/thermal resistance 3-1
13 Figure 3-13 shows the relati between the pipe diameter of the inlet and outlet of coolant and the pressure loss when 50% LL is fed at the flow rate of 10 L/min. If the pipe diameter is too small, the pressure loss increases. The recommended pipe diameter is φ1 mm. Fig Pipe diameter and pressure loss Selecti of O-ring Since the IGBT module is mounted to the liquid-cooling jacket via a sealing material, sealing technique for preventing coolant leakage even if temperature and water pressure change is essential. As a sealing material, an O-ring that is mounted by grooving the liquid-cooling jacket is recommended. As the material of the sealing material, ethylene propylene rubber (E116, NOK orporati) is recommended. Figure 3-14 shows a typical sealing part. As the diameter of the sealing material, φ.5 mm or larger is recommended. The groove of the water jacket to which the sealing material is to be mounted should be as deep as approximately 0.7 to 0.8 times the diameter of the sealing material. Ensure that the average surface roughness of the sealing surface of the water jacket falls within the following range: Ra<1.6 µm, Rz<6.3 µm. Diameter of the sealing material: >φ.5 mm Surface roughness: Ra < 1.6 µm, Rz < 6.3 µm Depth of the groove: Diameter of the sealing material 0.7 to 0.8 Fig. 3-1 Detailed drawing of the sealing part 3-13
14 3.1.5 Typical water jacket Refer to figure 3-15(a) and (b) for an example of liquid-cooling jacket for 6MBI400VW-065V/ 6MBI600VW-065V. Fig. 3-15(a) liquid-cooling jacket for 6MB400VW-065V 3-14
15 Fig. 3-15(b) liquid-cooling jacket for 6MB600VW-065V 3-15
16 3. Mounting procedure Figure 3-16 shows the procedure of fastening screws when mounting the IGBT module cooling jacket. The screws should be fastened by specified torque which is shown in the specificati. If this torque is insufficient, it would cause a coolant leakage from the jacket or loosening of screws during operati. If excessive torque is applied, the case might be damaged. モジュール Module 1 Order of ネジ締め順 fastening screws 3 Liquid-cooling ウォータージャケット jacket 4 Torque Sequence Initial 1/3 specified torque Final Full specified torque Fig Screw sequence for IGBT module 3.3 Temperature check After selecting a liquid-cooling jacket and determining the mounting positi of the IGBT module, the temperature of each part should be measured to make sure that the juncti temperature (Tj) of the IGBT module does not exceed the rating or the designed value. 3-16
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