AN603 Parallel Datasheet

AN603 Datasheet PDF, Equivalent


Part Number

AN603

Description

Operating ICON H-Bridges in Parallel

Manufacture

Solutions Cubed

Total Page 13 Pages
Datasheet
Download AN603 Datasheet


AN603
AN603: Operating ICON H-Bridges in Parallel
1
Overview:
There may be instances where the 12A continuous current handling capability of the ICON H-
Bridge is not adequate for a specific application. For higher current applications there are at least
two options that can be implemented to allow the ICON H-Bridge to meet the needs of the design.
The first option is to increase the power dissipating capability of your system. This can most
easily be accomplished by increasing the forced airflow over the ICON H-Bridge with a high-
speed, high-volume, fan. But even with increased airflow the ICON H-Bridge will probably not be
capable of continuously handling more than 20A of continuous current due to the size of the
ICON H-Bridge PCB.
The second option is to operate multiple ICON H-Bridges in parallel. The N-channel MOSFETs
that make up the H-bridges can efficiently share current, thus increasing the overall current
handling capability of your system. In addition, the number of control lines required to interface to
each of the MOSFETs is not increased since these control lines may also be paralleled. In this
application note a single PIC16F873 (Microchip) microcontroller was used to control four ICON H-
Bridge modules.
An analog-to-digital converter (ADC, internal to the PIC16F873) was used to establish a pulse-
width-modulation duty-cycle (PWM, also internal to the PIC16F873) to control four ICON H-Bridge
modules connected in parallel. The system was configured for unidirectional speed control and
was tested at 24V with a resistive load of 0.389. A custom PCB was designed to carry the four
ICON H-Bridge modules and the control circuitry. In testing, this design was able to deliver 48A
of continuous current to the load at a 98% duty cycle (roughly 900W) for several hours.
H-Bridge Configuration:
The ICON H-Bridge modules were configured to operate in “direct drive” mode for this application
note. All other settings in the ICON H-Bridges were left in their default state (as described in
ICON H-Bridge datasheet). A single ICON Interface Module was used to program the ICON H-
Bridges for direct drive mode using the ICON Interface Module control software available at the
www.solutions-cubed.com web site.
In direct drive mode the serial DIN line of each H-bridge becomes the /ENABLE line. Driving this
line to 0V turns on the H-bridge, and enables the H-bridge control lines (HI-A, LO-B, HI-B, and
LO-A) to actively control the MOSFETs on all four H-Bridges. Additionally, direct drive mode
www.DataSheet4cUo.cnovmerts the DOUT line from a serial output to a STATUS line. When this line is at a logic high
(+5V) the H-bridge is disabled. A logic low indicates that the H-bridge is enabled.
Figure 1: Direct Drive Mode Control Signals
HI-B
LO-A
HI-A
LO-B
DIN OFF ON
OFF ON
FORWARD
enable high side
enable high side
PWM
PWM
REVERSE
DIN controls H-bridge
DOUT
FAULT
DOUT mirrors H-bridge state except for fault condition
DIRECT DRIVE MODE CONTROL SIGNALS
ICON DC Motor Control System - Solutions Cubed
www.solutions-cubed.com

AN603
AN603: Operating ICON H-Bridges in Parallel
2
It would be feasible to configure the PIC16F873 to test the ICON H-Bridges for direct drive mode
of operation on power-up by toggling the DIN line and checking to see if the DOUT line follows
the input. If the devices were not configured for direct drive mode they could be programmed to
operate in direct drive mode via the DIN and DOUT connections of each H-bridge and the ICON
H-Bridge communication protocol. This would eliminate the need for the ICON Interface Module
used during the programming phase of this application note. There is also no reason that this
application note could not be modified to implement the full serial communication protocol.
Hardware:
The custom PCB was designed to mount all four ICON H-Bridges in close proximity to each
other. Mounting holes were included for the ICON Active Cooling fans. ¼” bolts were used as
the connection points for both the load and the load supply, and were responsible for carrying the
high currents required for this application note. As mentioned earlier the load supply was 24V
and rated for 60A. The 12V supply required to power each ICON H-Bridge and the four cooling
fans was provided by a separate 12V power supply. The 5V necessary to power the PIC16F873
was generated with a linear regulator connected to the 12V power supply.
Connector J2 (the 20 pin 0.1” shrouded header) was included and mirrors many of the
connections of the ICON Interface Module. This allows the design to work with the ICON Adapter
Board. The ICON Adapter Board was used to provide the analog input signal for PWM
generation and TTL to RS232 conversion for the serial interface built into the application.
Figure 2: PIC16F873 and Support Circuitry
VCC_12V
J1
1
2
+ C1
330uF 35V
CONN TRBLK 2
+ C2
330uF 35V
C3
0.01 uF
U1
MC7805B-D2T
1
2
Vin
Vout 3
GND
VCC_5V
R1 1.0K
C4
0.01 uF
C5
2.2 uF
D1
Green
J2
2520-6002UB
VCC_EXT 1
www.DataSheet4U.com
VDD
_RESET
4
2
VPP
PGD
PGC
GROUND
3
5
6
7
ANALOG_IN 8
13
RX
TX
14
+5VDC
+5VDC
GROUND
GROUND
9
10
20
11
_BRAKE
N/C
N/C
N/C
N/C
N/C
12
15
16
17
18
19
C6
0.01 uF
VCC_5V
U5
MCP809T
3
1
Vcc /reset
GND
2
R10 10K
R13 1.0K
VCC_5V
R18
10K
C7
0.01 uF
R15 10K
R16 10K
VCC_5V
SW1
2 pos switch
14
23
VCC_5V
R20 R21
10K 10K
C8
27 pF
X1
1
2
4
3
19.66MHz
C9
27 pF
U3
PIC16F873-20I/SP
20 VDD
1
28
27
MCLR/VPP/THV
RB7/PGD
RB6/PGC
RB5/DIN1
RB4/DOUT1
RB3/DIN2
RB2/DOUT2
RB1/DIN3
RB0/DOUT3
RC5/DIN4
RC4/DOUT4
26
25
24
23
22
21
16
15
2 RA0/AN0
18
17
3
RC7/RX/DT
RC6/TX/CK
RA1
RC0/HI_A
RC1/LO_A
RC2/LO_B
RC3/HI_B
11
12
13
14
6
7
RA4
RA5
RA3/AN3/VREF+ 5
9
10
OSC1/CLKIN
OSC2/CLKOUT
RA2/AN2/VREF-
VSS2
VSS1
4
19
8
VCC_5V
VCC_5V
VCC_5V
VCC_5V
R2
1.0K
R3
1.0K
R4
1.0K
R5
1.0K
R6
1.0K
R7
1.0K
R8
1.0K
R9
1.0K
D2
Green
D3
Red
D4
Green
D5 D6
Red Green
D7
Red
D8
Green
D9
Red
DIN1
DOUT1
DIN2
DOUT2
DIN3
DOUT3
DIN4
DOUT4
VCC_5V
R19
10K
D10
5.6V
D11
5.6V
D12
5.6V
R11 120 Ohm
R12 120 Ohm
R14 120 Ohm
R17 120 Ohm
HI_A
LO_A
LO_B
HI_B
D13
5.6V
D14
LM4040BIM3-4.1
ICON DC Motor Control System - Solutions Cubed
www.solutions-cubed.com


Features AN603: Operating ICON H-Bridges in Para llel 1 Overview: There may be instanc es where the 12A continuous current han dling capability of the ICON HBridge is not adequate for a specific applicatio n. For higher current applications ther e are at least two options that can be implemented to allow the ICON H-Bridge to meet the needs of the design. The fi rst option is to increase the power dis sipating capability of your system. Thi s can most easily be accomplished by in creasing the forced airflow over the IC ON H-Bridge with a highspeed, high-volu me, fan. But even with increased airflo w the ICON H-Bridge will probably not b e capable of continuously handling more than 20A of continuous current due to the size of the ICON H-Bridge PCB. The second option is to operate multiple IC ON H-Bridges in parallel. The N-channel MOSFETs that make up the H-bridges can efficiently share current, thus increa sing the overall current handling capab ility of your system. In addition, the number of control lines .
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