PD 6.113 PRELIMINARY IRPT1057 ΤΜ Integrated Power Stage for 0.75 hp Motor Drives · 0.75 hp (0.56kW) power output Industrial rating at 150% overload for 1 minute · 180 - 240V AC input, 50/60Hz · Available as complete system or as sub-system assemblies Power Module · 3-phase rectifier bridge · 3-phase short circuit rated, ultrafast IGBT inverter · Low inductance (current sense) shunts in positive and negative DC rail · NTC temperature sensor · Pin-to-base plate isolation 2500V rms · Easy-to-mount two-screw package · Case temperature range -25°C to 125°C operational Driver-Plus Board IRPT1057C · DC bus capacitor filter with NTC inrush current limiter · IR2132 monolithic 3-phase HVIC driver · On-board +15V and +5V power supply · MOV surge suppression at input · DC bus voltage and current feedback · Protection for short-circuit, earth/ground fault and overtemperature · Terminal blocks for 3-phase input and output connections Figure 1. The IRPT1057C control system within a motor page 1 IRPT1057 System Description The IRPT1057C provides the complete conversion function for a 0.75hp (0.56kW) variable frequency, variable voltage, AC motor controller. The combines a power module IRPT1057A with a Driver-Plus Board IRPT1057D. Figure 1 shows the block diagram of the within an AC motor control system. The power module contains a 3-phase input bridge rectifier, 3-phase IGBT inverter, current sense shunts, and a thermistor. It is designed for easy mounting to a heat sink. The Driver-Plus Board contains DC link capacitors, capacitor soft charge function using NTC thermistor, surge suppression MOVs, IGBT gate drivers, DC bus voltage and current feedback signals, protetion circuitry and local power supply. It is designed to mate with a controller board through a single row header. Terminal blocks are provided on the Driver-Plus Board for all end user line input and motor output. Output power is Pulse-Width Modulated (PWM) 3-phase, variable frequency, variable voltage controlled by an externally generated user-provided PWM controller for inverter IGBT switching. The power supply offers the user non-isolated 5V and 15V to power the micro-controller. The IRPT1057C offers several benefits to the drive manufacturer listed below: • It greatly simplifies component selection, design of layout, interconnection, gate drive, local power supply, thermal sensing, current sensing and protection. • Gate drive and protection circuits are designed to closely match the operating characteristics of the power semiconductors. This allows power losses to be minimized and power rating to be maximized to a greater extent than is possible by designing with individual components. • It reduces the effort of calculating and evaluating power semiconductor losses and junction temperature. • It reduces the manufacturer's part inventory and simplifies assembly. [ specifications and ratings are given for system input and output voltage and current, power losses and heat sink requirements over a range of operating conditions. system ratings are verified by IR in final testing.] The IRPT1057A Power Module The IRPT1057A Power Module, shown in figure 2, is a chip and wire epoxy encapsulated module. It houses input rectifiers output inverter, current sense shunts and NTC thermistor. The 3-phase input bridge rectifiers are rated at 800V. The inverter section employs 600V, short circuit rated, ultrafast IGBTs and ultrafast freewheeling diodes. Current sensing is achieved through 75mΩ low inductance shunts provided in the positive and negative DC bus rail. The NTC thermistor provides temperature sensing capability. The lead spacing on the power module meets UL840 pollution level 3 requirements. The power circuit and layout within the module are carefully designed to minimize inductance in the power path, to reduce noise during inverter operation and to improve the inverter efficiency. The Driver-Plus Board required to run the inverter can be soldered to the power module pins, thus minimizing assembly and alignment. The power module is designed to be mounted to a heat sink with two screw mount positions, in order to insure good thermal contact between the module substrate and the heat sink. Figure 2. IRPT1057A Power Module page 2 IRPT1057 The IRPT1057D Driver-Plus Board The IRPT1057D Driver-Plus board, shown in figure 3, houses surge suppression MOVs on input, a switching power supply, a DC bus filter capacitor with NTC inrush current limiter, an IR2132J monolithic 3-phase driver IC, and protection and sensing circuitry. The inverter gate drive circuit, implemented with an IR2132J monolithic 3-phase HVIC driver, delivers on/off gate drive signals to the IGBTs’ gates, corresponding with input PWM control signals IN1 through IN6. After power-up, RESET pin on the J3 connector must be held low (with open collector configuration) for at least 2µsec while all PWM signals, IN1 through IN6 are held high (off condition). A latch in the protection circuitry is set high during a fault condition to trip the IR2132J’s internal latch and shut down all PWM output gate drive signals and cause the FAULT output pin on IR2132J to set low and light the LED. The Fault diagnostic is an active low, open drain output with a pull-up resistor. This signal is provided on the J3 connector for fault feedback to external control logic. The protection circuitry receives current signals from shunts in positive and negative DC bus rail for earth/ground fault and short-circuit conditions. Any earth-fault signal is fed through an opto-isolator to the protection circuitry. Current signal from negative DC bus rail is provided on the J3 connector as current feedback, I FB (0.075V/A). If filtering of this signal is required, it should be done by adding a high-impedance buffer stage between signal and filter. DC bus voltage is scaled down to provided a voltage signal on the J3 connector as voltage feedback, VFB (0.023 x Bus voltage). Thermal sense signal for over-temperature protection is obtained from a thermistor housed inside the power module. The thermistor activates the latch if the temperature of the power module’s IMS substrate exceeds a set level. The system is designed for 150% overload for one minute while operating with the specified heat sink. The external microcontroller should shut off PWM signals if the overload condition persists for more than one minute. The switching power supply employs the IR2152S selfoscillating driver chip in a buck regulator topology to deliver nominal 15V and 5V DC outputs, referenced to the negative DC bus (N). The power supply feeds the gate drive and protection circuits. The 15V and 5V outputs are available on the control interface connector’s (J3) VCC and VDD pins for external microprocessor and control logic supply. Figure 3. IRPT1057D Driver-Plus Board page 3 IRPT1057 POWER MODULE RS1 RT P Q1 Q3 Q5 Q2 Q4 Q6 RS2 N RP P R S T N RP P IS4 IS3 IS1 IS2 G1 E1 G2 E2 G3 E3 G4 E4 G5 E5 G6 E6 U V W RT1 RT2 IS4 IS3 IS1 IS2 G1 E1 G2 E2 G3 E3 G4 E4 G5 E5 G6 E6 U V W RT1 RT2 Vcc NTC R S T OPTO ISOLATOR DC BUS LINK SC EF OT PROTECTION TRIP LATCH IR2132J MOS GATE DRIVER Vcc SWITCHING POWER SUPPLY 1 2 3 14 13 12 11 4 5 6 7 8 9 J3 J1 R S T V DD VCC N RESET VFB IFB +5 +15 3φ INPUT FAULT IN1 IN2 IN3 IN4 IN5 IN6 DRIVER BOARD PLUS Driver-Plus Board Figure 4. IRPT1057C Basic Architecture page 4 U V W J2 3φ OUTPUT IRPT1057 Specifications PARAMETERS Input Power VALUES Voltage Frequency Input current 220V, -15%, +10%, 3-phase 50/60Hz 4.6 Arms @ nominal output 100 A peak CONDITIONS TA = 40°C, RthSA = 1.79°C/W Initial bus capacitor charging Output Power Voltage Nominal Motor hp (kW) Nominal motor current 0 - 230V 0.75hp (0.56kW) nom. full load power 150% overload for 1 minute 3.3A nominal full load current 4.95A 150% overload for 1 minute defined by external PWM control Vin = 230V, fpwm = 4kHz, fo = 60Hz TA = 40°C, RthSA = 1.79°C/W ZthSA limits ∆Tc to 10°C during overload 5V maximum, active low 0.8 µsec typ. deadtime set by IR2132J 1 µsec open collector, active low CMOS, LSTTL compatible, open collector max. deadtime set by external controller Control Inputs PWM input signals IN1...IN6 Pulse deadtime Minimum input pulse width RESET pin 14 of control interface connector pull down for ⊕ 2µsec to release latch Protection Output current trip level Earth/gnd fault current trip level Overtemperature trip level 18A, ± 10% 22A, ± 10% 100°C, ± 5% Maximum DC link voltage Short circuit shutdown time 400V 2.5 µsec typical TC = 25°C TC = 25°C Case temperature user to ensure rating not exceeded for >30 sec. output terminals shorted Feedback Signals Current feedback (IFB) DC bus voltage feedback (VFB) Fault feedback (Fault) 0.075V/A 0.023 typical V/VBUS 5V, active low On Board Power Supply VCC VDD ICC+ IDD 15V, ± 10% 5V, ± 5% 60mA max. limit specified is available on control interface connector J3 for external use Module Isolation voltage 2500V rms Operating case temperature -25°C to 125°C Mounting torque 1 Nm pin to base plate isolation, 60Hz, 1 minute 95%RH max. (non-condensing) M4 screw type System Environment Ambient operating temp. range 0 to 40°C Storage temperature range -25 to 60°C 95%RH max. (non-condensing) page 5 IRPT1057 SA SA SA SA PWM Frequency (kHz) – (Induction Motor Load) Figure 5a. 0.75hp/3.3A output Heat sink Thermal Resistance and Power Dissipation vs. PWM Frequency SA SA SA SA PWM Frequency (kHz) – (Induction Motor Load) Figure 5b. 0.5hp/2.2A output Heat sink Thermal Resistance and Power Dissipation vs. PWM Frequency NOTE: For figures 5a and 5b – Operating Conditions: Vin = 230V rms, MI = 1.15, P.F. = 0.8, TA = 40°C. ZthSA limits ∆Tc rise during 1 minute overload to 10°C. page 6 IRPT1057 Mounting, Hookup and Application Instructions Mounting Control Connections 1. Remove all particles and grit from the heat sink and power substrate. 2. Spread a .004" to .005" layer of silicone grease on the heat sink, covering the entire area that the power substrate will occupy. Recommended heat sink flatners is .001 inch/inch and Total Indicator Readout (TIR) of .003 inch below substrate 3. Place the power substrate onto the heat sink with the mounting holes aligned and press it firmly into the silicone grease. 4. Place the 2 M4 mounting screws through the PCB and power module and into the heat sink and tighten the screws to 1 Nm torque. All input and output control connections are made via a 16terminal female connector to J3. 123456789012345678901234567890 123456789012345678901234567890 123456789012345678901234567890 123456789012345678901234567890 123456789012345678901234567890 123456789012345678901234567890 123456789012345678901234567890 123456789012345678901234567890 123456789012345678901234567890 1 2 123456789012345678901234567890 123456789012345678901234567890 123456789012345678901234567890 123456789012345678901234567890 123456789012345678901234567890 123456789012345678901234567890 Power Connections 3-phase input connections are made to terminals R,S and T (J1). Inverter output terminal connections are made to terminals U,V and W (J2). Power-Up Procedure When 3-phase input power is first switched on, PWM inputs to the IRPT1057C must be inhibited (held high) until the protection latch circuitry is reset. To reset this latch before inverter start-up, RESET pin on J3 connector must be pulled down low for at least 2 µsec. This will set the Fault feedback signal on J3 high. Now, the PWM input signals can be applied for inverter start-up. Power-Down Procedure The following sequence is recommended for normal power down: 1. reduce motor speed by PWM control 2. inhibit PWM inputs 3. disconnect main power. Figure 6. Power Module Mounting Screw Sequence Figure 7a. Control Signal Connector Figure 7b. Input and Output Terminal Blocks page 7 IRPT1057 IRPT1057D Mechanical Specifications NOTE: Dimensions are in inches [milliimeters] 2.80 [71.12] 2.20 [55.88] 1 2 3 J1 16 J3 1.55 [39.37] 2.40 [60.96] CAPACITOR 2.80 [71.12] 1 HEATSINK PCB 1 2 3 J2 CAPACITOR 2.25 [57.15] J1 1 2 3 J2 1 2 3 MODULE HEATSINK Figure 8a page 8 J3 .500 [12.70] IRPT1057 IRPT1057A Mechanical Specifications .750 [19.05] .950 [24.13] .450 [11.43] .550 [13.97] .150 [3.81] .250 [6.35] .150 [3.81] .050 [1.27] .750 [19.05] ALL PIN COORDINATE DIMENSIONS ARE BASIC .550 [13.97] .450 [11.43] 1.050 [26.67] NOTE: Dimensions are in inches [milliimeters] RT1 RT2 N/C E5 G5 E3 G3 E1 G1 RP P IS1 IS2 N .875 [22.27] PIN CENTER W PIN DIAGONAL .037 – .034 [.940 – .864] 28X 1.050 [26.67] .850 [21.59] .650 [16.51] E4 G4 E6 G6 N/C V U .050 [1.27] .000 [0.00] IS4 IS3 E2 G2 .250 [6.35] .350 [8.89] N/C .650 [16.51] S .850 [21.59] PIN CENTER .875 .[22.27] R .000 [0.00] .010 M A 28X [ .026 – .024)] 28X .040 [1.02] MOUNTING SURFACE IN CLAMPED CONDITION –A– Figure 8b page 9 IRPT1057 Part Number Identification and Ordering Instructions IRPT1057A Power Module IRPT1057D Driver-Plus Board Chip and wire epoxy encapsulated module with 800V rectifiers, 600V short-circuit rated, ultra-fast IGBT inverter with ultra-fast freewheeling diodes, temperature sensing NTC thermistor and current-sensing low-inductance shunts. Printed Circuit board assembled with DC link capacitors, NTC in-rush limiting thermistor, high-power terminal blocks, surge suppression MOVs, IGBT gate drivers, protection circuitry and low power supply. The PCB is functionally tested with standard power module to meet all system specifications. IRPT1057C Integrated Power Module (IRPT1057A) and Driver-Plus Board (IRPT1057D) pre-assembled and tested to meet all system specifications. page 10 IRPT1057 Functional Information CAUTION: All control logic is referenced to negative power bus which is live with respect to earth/ground. Capacitor Soft Charge A DC bus capacitor is connected to the rectifier bridge output through an NTC. At power-up, the NTC limits the inrush current to 100A. During normal operation current through the NTC reduces its resistance, hence reducing its losses. System Power Supply A buck converter designed with IR2152 and operating from the dc bus generates VCC (15V) and VDD(5V) for drive and protection circuits. Both VCC and VDD are available at the control connector to supply microprocessor controls. Total current available from VCC and VDD (ICC and ID, respectively) is 60mA for external use. Floating power supplies for high side devices are derived through bootstrap technique, simplifying power supply requirements. Gate Drive Circuits Gate drive for the inverter is implemented with an IR2132J monolithic 3-phase HVIC driver. Short circuit buffer power supply counters the voltage drop across a shunt in the negative dc bus, allowing the device to have nominal gate voltage during short circuit and maintaining short circuit current to a detectable level. The undervoltage circuit monitors the local gate driver power supply voltage and sends a high input signal during undervoltage, setting the latch and inhibiting the PWM input signals. System Protections Short circuit is monitored through a shunt in the negative bus, which detects phase-to-phase short circuits and phase-toearth short circuits (when current flows from earth to negative bus). Voltage drop across the shunt is compared to a pre-set limit and when the current exceeds a nominal value of 18A this protection is activated. Earth/ground fault from positive bus to earth is detected by the shunt in the postive bus and an opto-coupler. When fault current exceeds a nominal value of 22A, this protection is activated. Overtemperature is measured by a thermistor mounted close to the inverter section. When the substrate temperature exceeds a nominal value of 100°C, this protection is activated. If any of the protection features is activated, the TRIP signal goes high and is latched high, activating the internal latch in IR2132J, which turns all gates to the inverter section off, acknowledging to the controller through FAULT and turns on the LED. Trip Reset The internal latch of the IR2132J can be reset by holding IN2, IN4 and IN6 OFF simultaneously for a period greater than 12 µs. The TRIP signal can be removed by pulling down the RESET pin through the open collector device for 2µs, this should be done only after IN1,...,IN6 are turned OFF. Interface with system controller All signals are referred to negative DC bus (N). IN1,...IN6 are TTL/CMOS compatible active low signals. Maximum voltage rating for these signals is 5V. All channels are provided with pull-up resistors and can be used with open collector inputs as well. FAULT is open collector, active low signal, provided with 47K pull-up resistor. Typical current sink capacity for this pin is 5 mA. RESET should be applied with open collector device only and only after IN1,...IN6 are turned OFF. Recommended RESET pulse duration is 2µs. VDD is 5V and VCC is 15V output. If 5V output is used with a large external capacitor, a diode should be connected between VDD (anode) and VCC (cathode) to ensure that VDD does not exceed VCC, due to potentially different discharge times for storage capacitors when power is turned OFF. VFB is scaled down dc bus voltage (0.023 X Vbus nominal). page 11 IRPT1057 I FB is DC bus current, 0.075V/A nominal. This pin must not be connected to circuit ground (N) through low impedance. If filtering of this signal is required, it shoud be done by adding a high impedance buffer stage between signal and filter. Heat sink Requirements Figures 5a and 5b of the IRPT1057 datasheet show the thermal resistance of the heat sink required for various output power levels and PWM switching frequencies. Maximum total losses of the unit are also shown. This data is based on the following key operating conditions: • The maximum continuous combined losses of the rectifier and inverter occur at full pulse-width-modulation. These maximum losses set the maximum continuous operating temperature of the heat sink. • The maximum combined losses of the rectifier and inverter at full pulse-width modulation under overload set the incremental temperature rise of the heat sink during overload, which is limited to 10°C due to ZthSA. • The minimum output frequency at which full overload current is to be delivered sets the peak IGBT junction temperatures. • At low output frequency IGBT junction temperature tends to follow the instantaneous fluctuations of the output current. Thus, peak junction temperature rise increases as output frequency decreases. Voltage Rise During Braking The motor will feed energy back to the DC link during electric braking, forcing DC bus voltage to rise above the level defined by input line voltage. Deceleration of the motor must be controlled by appropriate PWM control to keep the DC bus voltage within the rated maximum value. WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, Tel: (310) 322 3331 EUROPEAN HEADQUARTERS: Hurst Green, Oxted, Surrey RH8 9BB, UK Tel: ++ 44 1883 732020 IR CANADA: 7321 Victoria Park Ave., Suite 201, Markham, Ontario L3R 2Z8, Tel: (905) 475 1897 IR GERMANY: Saalburgstrasse 157, 61350 Bad Homburg Tel: ++ 49 6172 96590 IR ITALY: Via Liguria 49, 10071 Borgaro, Torino Tel: ++ 39 11 451 0111 IR FAR EAST: 171 (K&H Bldg.), 30-4 Nishi-ikebukuro 3-Chome, Toshima-ku, Tokyo Japan Tel: 81 3 3983 0086 IR SOUTHEAST ASIA: 315 Outram Road, #10-02 Tan Boon Liat Building, Singapore 0316 Tel: 65 221 8371 http://www.irf.com/ Data and specifications subject to change without notice. 9/97 page 12