34312C Compact High Power DC Electronic Load 1200V, 480A, 12KW
Maximum power 96KW（MASTER / SLAVE）
Maximum current 3840A（MASTER / SLAVE）
- 34000C Series has its own control and display panel, CC / CR / CV / CP / Dynamic modes, 150 sets Store / Recall memory which provides load set-up more efficiently, also can be remote controlled via GPIB、RS232、USB and LAN interface.
- SHORT time setting and SHORT_VH, SHORT_VL setting function, also can measure Short Voltage and Current.
- Dynamic can be simulated under CC, CP mode. The current Rise / Fall slew rate can be adjusted individually and there is an external signal input for a Arbitrary Waveform to simulate load current.
- Single key for OCP、OPP test function will be more efficiency and accuracy on OCP、OPP testing.
- Programmable Load ON/OFF voltage, GO/NG meter check, Voltage meter display ” + “ or “ – “ is selectable and 150 sets Store/Recall larger memory is much advance feature for each different application.
- 150 sets test parameter and status storage function, user can recall the storage memory real time in accordance with the auto sequence requirement.
- Maximum Voltage up to 1200V provide an idea testing solution for Power Factor Correction test.
- Master / Slave control units maximum up to 1 MASTER, 7 SLAVE.
- With parallel function maximum power up to 192KW.
- 5 digit V/A/W Meter.
- High-speed measurement and communication transmission.
- Large LCD Display、setting values can be adjusted by rotary knob or push button.
- Voltage、Current and Watt value can be displayed simultaneously.
- Capable for Power Factor Correction （PFC） Test. （ for 600V, 1200V models）
- OCP、OPP test function automatically.
- Power ON status can be set.
- CC, CR, CV, CP , , , Dynamic and Short operation mode.
- SHORT time setting.
- Protections against I,W,°C and over-voltage alert.
- Voltage meter display the polarity positive（”＋”）or negative（”－”）is selectable.
- Optional Interface : GPIB、RS232、USB、LAN.
- Built-in soft-start circuit function allowing the U.U.T. power supply to be directly connected to the 342xC、343xC series load input terminal, no longer need a large relay switch with an external soft-start circuit.
- New waveform generator plug in model 9923 adds user programmable battery dischargecurrent waveform simulation to Prodigit DC Loads
- Voltage / Current source
- SMPS transient response
- CV/Current limit testing and battery emulation
- Battery charger
- Battery discharge
- R&D Quality Control
- ATE system
- Production testing
All electrified vehicles rely on rechargeable batteries for their electrical energy source. These batteries must be charged at regular interval using either alternating current or direct current charging technology.
AC charging is convenient when drawing power from the utility grid. Prevailing industry charging standards use a variety for voltage and current ratings such as 120V / 12A, 120V / 16A; 220V / 12A, 220V / 16A, 220V / 80A and others depending on region. For fast public charging stations, three phase power is used to shorten charging times significantly. Often, on-board AC chargers are installed in the vehicle so they can be charged from any available AC outlet although charging times using on-board chargers can be quite long as they are often limited in voltage and current capability. However, ready access to standard grid power is an important convenience.
For DC charging, standards are different by region as well. For Taiwan, Japan and the United State, 600V / 200A is typical. For Europe, 850V / 200A is commonly used while mainland China uses a 750V / 250A three phase DC charging standard. DC fast chargers are typically installed in public charging stations and can offer greatly reduced charging times due to their ability to deliver high voltage and high current at the same time for fast charging of DC batteries.
The 9841 battery charge and discharge test system can accommodate a full range of Prodigit electronic loads
and has been adopted by the STC Bureau.
Battery Charging Methods
The most common batter charger mode for electric vehicle charging is to use constant current, constant voltage (CC-CV) mode. This means the battery is charged using a constant current level which allows quick charging of the battery while monitoring the battery voltages as it charges up. When the battery voltage reaches its peak voltage, the charger switches over to constant voltage mode preventing the battery voltage from reaching excessive levels. This method is illustrated in Figure 1.
Electric Vehicle Charging Station Test Method
When charging electric vehicle batteries using an on-board vehicle charger or charging station, the battery represents a load to the charger. During the charging process, the battery voltage will increase slowly. To enhance the speed of the charger to detect the battery voltage, using an electronic load to simulate a battery and its impedance during charger design will enable better and faster test verification.
For battery simulation applications, the most commonly used Load operating mode is Constant Voltage (CV) which simulates the battery voltage or Constant Resistive mode which simulates the battery impedance.
In Constant Voltage (CV) mode load mode, the terminal voltage of the electronic load is held at the CV setting voltage value. By adjusting the CV setting value, battery states ranging from fully discharged state to fully charged state can be simulated easily.
In Constant Resistive (CR) mode, the terminal voltage of the electronic load is held at the multiple of the charge current and the CR setting value. By changing the CR setting value of the load, various impedance states of the battery can be simulated ranging from fully charged to fully discharged.
As mentioned, Constant Voltage (CV) mode can be used to simulate different state of charge (SoC) conditions of a battery pack during charge and discharge cycles. This include low battery voltage, increasing battery voltage during charging and high voltage state when fully charged. During each stage, the load monitors and displays important parameters such as voltage, power (Watt) and current. At the end of charge cycle, the load will transition to CC mode to CV mode which will be evident from the load display readouts as well. This approach is much more convenient than using actual batteries to test on-board chargers or charging station operation.
Load Model Selection
34000C Series electronic loads are equipped with built-in Over Power Limit (OPL) protection circuits to ensure safe operating when used in parallel mode. The purpose of the OPL feature is to limit the power to the load when the charger output power exceeds the maximum power rating of the load. In that case, the electronic load will automatically limit the input power at or near its maximum power specification and continue to operate at this power level. The OPL function allows two or more electronic loads to be used in parallel for high power applications.
For example, a 18kW charger can be tested using a 24kW rated electronic load to apply over current, over power conditions to the charger under test. If a 18kW rated electronic load is used instead, no charger over power conditions could be tested.
In case only a 18kW electronic load is available, a 6 kW load model can be added at any time to be used in parallel with the original 18kW load in Constant Voltage (CV) or Constant Resistive (CR) mode of operation. His is illustrated in Figure 2. This is due to the Prodigit load’s OPL function which allows CV or CR mode with parallel loads of unequal power ratings. This capability offers great flexibility in deploying multiple loads for a wide range of power requirements.
Electric Vehicle Battery Test Methods
Battery charge and discharge times and associated battery life are important considerations for electric vehicle designs. Another critical design criterion is safe operating area of the battery pack which relates to minimum and maximum charge and discharge voltage levels. For example, a single lithium-ion battery cell’s charging voltage cannot exceed 4.2Vdc to prevent overcharging while the discharge voltage cannot drop below 2.5Vdc to avoid excessive discharge. Both conditions can dramatically affect battery life and quickly and permanently damage the internal structure of the battery cell. Therefore, during development and test, careful attention must be paid to charging and discharging voltage levels to avoid permanent battery damage or deterioration.
Prodigit 34000C Series DC loads offer the following four operating mode to assist in avoiding conditions during battery discharge testing that could result in permanent battery due to over of under voltage.
1. CC+CV mode is aimed at battery discharge testing.
In this mode, discharging of the battery starts in CC mode of operation by setting a current discharge level (CC Set point) and a discharge stop voltage level (CV Set point) which determines full state of charge for the battery under test. When the battery voltage drops to the CV set point level, the electronic load stops discharging so that the battery voltage is maintained at the CV set value. Operation in CC+CV mode is very straightforward as the load automatically switches from CC constant current mode discharge mode to CV constant voltage mode. This prevents the battery from being damaged due to excessive discharging. This mode of operation is illustrated in Figure 4.
• Load input terminals are connected to the DUT
• Change to CC mode and setting CC current setting.
• Press Limit key to setting the CV voltage and the display will show “Add.CV”.
• Press START key to start up the CC+CV test, and press “STOP “key to stop CC+CV Test.
• Change to CP mode and setting CP power setting.
• Press Limit key to setting the CV voltage and the display will show “Add.CV”.
• Press START key to start up the CP+CV test, and press “STOP “key to stop CP+CV test.
• Setting CC+CV or CP+CV upper limit voltage, Middle 5 digit LCD display「Add.CV」, right 5 digit LCD display the unit is "V" , The Add.CV set range from 0.00 V to 600.00V step 0.01V by rotating the Setting knob.
In CC + UVP (Under Voltage Protection) mode of operation, the electronic starts discharging the battery using in constant current mode with a current drain determined by the CC set point. Discharging will continue till the battery reaches the Under voltage protection point as set by the UVP set point. At this point, the total amount of Ampere Hours drawn from the battery will be display in AH and no more discharging occurs.
Operation in CC + UVP mode is very straightforward as the load automatically switches from CC constant current mode discharge mode to OFF mode. This prevents the battery from being damaged due to excessive discharging. This mode of operation is illustrated in Figure 6.
1. To setting loads current on Constant current (CC) mode.
2. Press Config key to BATT1 and setting the UVP voltage.
3. Press Start key to do the BATT1 (CC+UVP) test
4. CP + UVP mode battery discharge test
In CP + UVP (Under Voltage Protection) mode of operation, the electronic starts discharging the battery using a constant amount of power drain as determined by the CP set point. Discharging will continue till the battery reaches the Under voltage protection point as set by the UVP set point. At this point, the total amount of Ampere Hours drawn from the battery will be display in AH and no more discharging occurs.
1. To setting loads power on Constant Power (CP) mode.
2. Press Config key to BATT1 and setting the UVP voltage.
3. Press Start key to do the BATT1 (CP+UVP) test
When testing loads on of Constant Power (CP) mode, battery voltage is less than UVP Setting values, The Load ON LED is off to indicate Load off status, and displays the total discharge stored energy of the AH .
5. Time period discharge, pulse discharge, RAMP Ramp mode discharge
In addition to the four battery discharge test modes described above, the 34000C electronic loads also support pre-set discharge time interval setting and pulse current discharge modes. Discharge current can also be programmed to follow a set step or ram pattern as needed. A sample discharge current waveform is shown below. These specific discharge profiles can be used to simulate actual driving conditions dependent battery discharge profiles to test and evaluate battery performance and life-span.
In time period discharge mode, the total discharge time is programmed on the load by the user as shown in Figure 8. When the discharge time reaches zero, discharging is stopped and the discharge time and end of discharge battery voltage will be displayed. Programmable range for discharge time interval ranges from 1 second to 99999 seconds or 27 Hours.
3. Press Start key to do the BATT3 (CC/CP + discharge time) test
When testing loads on of Constant current (CC) or Constant Power (CP) mode, when discharge time achieve setting time, this moment the load on auto change to load off and display battery voltage.
5.2 Pulse discharge
The current test of pulse discharge, use pulse mode for battery discharge test, and use DYNAMIC MODE to test + Repeat Function, as shown in Figure 9 test LOAD ON, DYN ON to COUNTER = 0 to the end, when end LOAD OFF, DYN OFF. For details please contact PRODIGIT sales.
5.3 RAMP discharge
RAMP mode discharge test, Slew-Rate sink current + Repeat function, as shown in Figure 10. Please contact PRODIGIT sales for detail operation of RAMP mode.
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RS-232 Card LAN Card
USB Card Options：Hook ring
Options：Rack Mount Kit for Rack Options：Handles