PTC
coolant heater can provide heat for driving cabin of electric vehicle and also
provide heat for other space, e.g. batteries.
1.1.2 features
Using electricity to heat coolant and PTC heater to generate heat.
Installed in water cooling system
Soft wind and controllable temperature
Use PWM to control driving and
with IGBT to adjust power
With short-period heat storage function
Whole vehicle circulation, supporting battery thermal management
environmental
1. basic electrical
performance
2.1 basic electrical parameters
item | condition | Min | typical | Max | Unit |
power | a)test voltage：control voltage：DC12V；loaded voltage：350VDC b)ambient temperature：20℃±2℃；inlet temp：0℃±2℃；flow rate：10L/min c)air pressure：70kPa~106ka |
| 3000 |
| W |
Weight | Without coolant and wires |
| 2.1 |
| KG |
Coolant volume |
|
|
|
| mL |
2.2 temperature
item | condition | Min | Typical | Max | Unit |
Storage temp |
| -40 |
| 105 | ℃ |
Working ambient temp |
| -40 |
| 105 | ℃ |
humidity |
| 5% |
| 95% | RH |
2.3 Low voltage
item | condition | Min | Typical | Max | Unit |
Control voltage VCC |
| 9 | 12 | 16 |
|
lead |
|
| 0 |
|
|
current | Steady state | 90 | 120 | 160 |
|
Start current |
|
|
| 1 |
|
2.4 High voltage
item | condition | Min | Typical | Max | Unit |
voltage | heating |
| 350 |
| V |
Current | Nominal |
| 8.6 |
| A |
Inrush | nominal |
|
| 11.2 | A |
Standby | nominal |
|
| 1.6 | mA |
2.5 High voltage safety
1 | High voltage warning label |
Available |
2 | Fire retardant plastic shell |
Available |
3 | Insulation of HV parts | Available
|
4 | Lead wires | Available
|
5 | insulation resistance>50MΩ | Available
|
6 | Passive discharge | Available
|
7 | HV interlock | Available
|
8 | HV terminals IPXXB protection | Available
|
9 | IP67 protection | Available
|
10 | 2U+1000Vbreakdown
voltage test | Available
|
11 | HV over voltage shutoff | Available
|
12 | PTC over-temp protection | Available
|
13 | PCB over-temp protection | Available
|
14 | IGBT over-temp
protection | Available
|
15 | PTC over current protection | Available
|
16 | PTC short circuit protection | Available
|
17 | IGBT brakdown feedback | Available
|
18 | PTC temperature sensor barrier test and shut off
heating | Available
|
19 | IGBT temperature sensor barrier test and shut off
heating | Available
|
20 | PCB temperature sensor barrier test and shut off
heating | Available
|
21 | Even if IGBT
fails, PTC self-limiting
temperature will not exceed 200+℃ | Available
|
22 | HV anti-reverse connection | Available
|
23 | HV reverse connecting feedback（reverse connecting may cause
uncontrolled heating and damage PTC coolant heater | Available
|
24 | Self-exam when power on. | Available
|
25 | When communication is interrupted, heating will stop | Available
|
26 | High voltage acquires real-time feedback | Available
|
control method
3.1 air conditioning control fame
② input command on air conditioning panel
②transfer with CAN
communication or ON/OFF PWM to controller
③ once coolant heater gets with command signal,
it will start PTC heater with PWM at input power
Advantage:
① 2circuits of PWM control，small inrush
current
② PWM control method can control power
constantly.
③ CAN communication can show status of heater
which is convenient to monitor.
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