PTC coolant heater
Category: PTC coolant heater  Publish Time: 2018-07-02 17:24 

PTC coolant  heater

New Energy Vehicle Coolant PTC heater Assembly

Function

The coolant PTC heater assembly can provide heat for new energy vehicle cockpits and meet the criteria for safe defrost and defogging.

At the same time, it provides heat for other parts of the vehicle that need temperature regulation.

Features                               

       Electric heating of antifreeze, heating through the heating core

       Installed in a water-cooled circulation system

       Soft warm and temperature control

       PWM adjustment drive IGBT to adjust the power

       Short-term heat storage

       Vehicle cycle, support battery thermal management

       Environmental protection

Electrical performance

Basic parameters

Description

Conditions

Min

Typ

Max

Units

Power

   a) Test voltage: Control voltage: DC24V; Load voltage: 600VDC

     b) Ambient temperature: 25°C ± 2°C; Inlet temperature: 0°C; Flow rate: 10L/min

     c) Air pressure: 70kPa~106ka


6000


W

Weight

 No coolant, no connection

 

2.5


kg

Coolant volume

 


145


mL

 

Temperature

Description

Conditions

Min

Typ

Max

Units

Storage temperature  


-40

 

125

Working temperature 

 

-30

 

105

Maximum coolant temperature

Input pressure 200kPa

-40

 

100

Low voltage:

Description

Conditions

Min

Typ

Max

Units

Control voltage

 

18

24

32

V

Grand

 

 

0

 

V

Supply Current

Steady Current

90

120

160

mA

Starting current

 

 

 

1

A

High Voltage:

Description

Conditions

Min

Typ

Max

Units

Supply voltage

Turn on heating

550

600

750

V

Supply current

Nominal conditions




A

Surge current

Nominal conditions

 

1.3 times of rated voltage


A

Standby current

Nominal conditions

 


1.6

mA

High pressure:

Name

High Pressure Safety

Remarks

High-pressure mark

Adhesion warning mark

Material wear-resistant, resistant to vehicle typical chemicals

Contact protection

1. Meets the requirements for Class II components 2. Meets IPXXD after assembly

 

High voltage short circuit protection

existence

 

High voltage overload protection

existence

 

High and low voltage electrical isolation

Coupling isolation

High and low voltage power supplies use magnetic isolation, optical isolation for control signals

Insulation resistance

≥50 MΩ

satisfies more than 500Ω/V

Voltage resistance

No dielectric breakdown or arcing at AC800V for 1 minute

Performance requirements for PTC wafers

Insulation pressure

 AC2500V, 50~60Hz, leakage current <10mA, 60s, no dielectric breakdown or arc phenomenon

Performance requirements for insulation protection

IP protection class

IP67


Others:

Description

Conditions

Min

Typ

Max

Units

Humidity

 

5

 

95

%

ESD resistance strength

 

-8KV

 

+8KV

 

Pressure loss

Coolant temperature=0flow rate=10L/min

 

10

 

kPa

Working pressure

 

 

0.25

 

MPa

Peak pressure 0.5 Mpa during work

 

 

0.5

 

Mpa

Coolant filling allowable negative pressure

 

 

 

0.4

kPa

 

Control method::

 CAN communication           

1 PWM Soft start

PWM uses 30 seconds from 0 to 100%  . This feature is used to protect high-inrush currents and sudden changes on the high-voltage bus. Each step is soft-started and there is ripple current in the soft-start process, and the inrush current is small (<1.3 times of the rated current).

2 Limiting function

2.1 Temperature limiting

2.1.1 When the outlet temperature reaches 80°C, the power will be gradually reduced to maintain a relatively constant water temperature at the outlet.

2.1.2 When any IGBT temperature reaches 85°C, it will gradually reduce the power or shut down . When it is lower than 80°C, it will resume working so that the IGBT temperature does not exceed the limit value.

3. Power limiting

3.1 Soft start power limiting

Each channel power is limited to 1425W during soft start

3.2 Overcurrent protection

In the heating operation, if the road lasts for more than 2 times  of the rated current for 5s, it is considered overloaded and the road will be shut down and restarted.

4 Protective function

4.1  High voltage overvoltage and undervoltage protection

The operating voltage range can be set according to the customer's requirements. Heaters that are not in the range will not start and will be turned off. Resetting to the range will restart the soft start to the current set value.

4.2  IGBT Drive voltage over-voltage protection

The heater will be completely turned off when the IGBT driving voltage is not in the range of  the set working range , and the soft start will be resumed to the current setting value after recovery.

4.3  Low voltage reverse connection protection

The heater will not work if low voltage are reverse connecting .

4.4 Outlet temperature protection

When the outlet water temperature exceeds 105°C for 3 seconds, all heating will turn off immediately .

4.5  Short circuit protection

Any road of PTC short circuit, the road will  immediately close, then repeate testing 5 times, if still short circuit, the road will no longer turn on heating before re-power.

Warning: high pressure does not have the ability to prevent reverse connection, high pressure reverse connection will lead to direct heating can not controlled, high voltage reverse connection may lead to PTC damage and  failure to precharge and fail to start and can cause burnout of the precharge resistor  of the  whole vehicle!

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