A four-quadrant power supply is a power supply capable of absorbing and supplying positive and negative currents and voltages. While a simple voltage converter is capable of generating a fixed output voltage from the input voltage, this feature is not sufficient in some applications. An example is the control of voltage nodes connected to capacitors, which can be charged to any voltage. If the demand drops its voltage, it is necessary to partially discharge. Therefore, in such applications, it is necessary for the power supply to be able to supply or absorb current according to demand. This type of converter is called a four-quadrant DC-DC converter.
Regarding such an application, Delixi can use the power supply with the function of output discharge. It enables rapid discharge of the output capacitors. Here, after the buck converter is closed, switch S2 is turned on for a long time, and the output capacitor is discharged. An elegant way to control current and voltage is with a four-quadrant DC-DC converter. A typical buck converter operates in only one quadrant. It is capable of a positive voltage, a positive flow of current, i.e. a current flow from the DC-DC converter to the load. The use of a four-quadrant converter not only discharges the output capacitor, but also generates voltage. This is possible because current can flow both to and from the load. This was the case in the previous example of rapid discharge of the output capacitor. Four-quadrant dc-dc converters don't stop there. In addition to the generated voltage, it can also set the current to any level. This current can be either positive or negative. This four-quadrant converter is often used in general-purpose laboratory power supplies. For example, the user can set up a test LED with a fixed current. Solar cells are also capable of using a four-quadrant converter as a load to absorb a certain predetermined current.
Another interesting application is the use of LCD technology to tint window glass. This often requires the voltage to be set accurately in the range of positive and negative values to produce the right shade according to the prevailing light conditions in the room and the required brightness. The meaning of the four quadrants about power supply. In the quadrant of the coordinate system, the x-axis indicates the voltage and the y-axis indicates the current. The current and voltage can be positive or negative. As a result, the DC-DC converter can be used as both an energy source and an energy absorber. In other words, the converter can be used as both a power source and an electrical load.
The ADI LT8714 is a controller for four-quadrant regulators. It has all the functions needed for this type of conditioning. For example, the IC can be used to accurately maintain a voltage of 0 V. It consists of two inductors L1 and L2, two switches Q1 and Q2, and a coupling capacitor CC. Refer to the LT8714 data sheet for clarification of the corresponding actions in each quadrant and the conversion behavior from one quadrant to another. In some applications, power requirements operate in four quadrants. This can be easily built with an optimized controller such as the LT8714. The circuit design is very simple, and its operation, especially near the critical 0 V crossover point, which is frequently presented, is clean and robust. There are alternatives to four-quadrant regulators, such as switching regulator topologies, which are necessary to be connected in parallel to support multiquadrant functionality. However, these approaches are often more expensive than using dedicated four-quadrant solutions.
|
More on that
|
Delixi contactor selection considerations
Electrical safety is not a trivial matter in modern society. Delixi communication contactors are used in homes, public places or commercial buildings. As a power device, its importance is self-evident. If you buy an unsuitable communication contactor, it will appear briefly in the future application process ...
|
|
Delixi EM61 series inverter features
EM61 series inverter has optimized open-loop vector control, V F control, stable performance, optimized function, standard equipment for users, and can also expand multi-channel I-O interface and communication function, which is a compact low-power model.
...
|
|
Delixi three-phase circuit breaker classification
Delixi's three-phase circuit breaker is generally divided into three types, namely 3P, 3P+N and 4P.
(1) Differences:
3P: Pure three-phase electrical equipment only uses three wirings, and in the case of no single-phase load, it trips when it is short circuited to ground or phase; Otherwise, when a one-phase N-line load is generated, the N-line is disconnected ...
|
|
Delixi DZ47LE C40 air switch introduction
The general leakage circuit breaker is wired using the principle of outgoing wire under the progressive line, only need to distinguish the phase line and the zero line, between, the zero line is marked with N on the right, and the incoming and outgoing lines are the same.
Delixi DZ47LE C40 ...
|
|
The difference between linear regulator and switching regulator - Delixi
The switching voltage regulator is a different kind of regulated power supply from the linear voltage regulator, and its circuit types mainly include single-ended flyback, single-ended forward, half-bridge, push-pull and full-bridge.
The difference between it and the linear power supply is that the transformer in the circuit does not work at the power frequency, but at the power frequency.
|
|
Linear regulator and switching regulator concept - Delixi
01. What is a linear voltage regulator?
A linear regulator uses a transistor or FET that operates in its linear region to subtract the excess voltage from the input voltage applied to generate a conditioned output voltage.
The so-called voltage drop voltage means that the voltage regulator maintains its output voltage at its ...
|
|
The common sense principle of the inverter - Delixi inverter
The fuses should be installed on the lines of each phase. It is strictly forbidden to install fuses on the neutral line of the two-phase three-wire or three-phase four-wire circuit.
Fuses are mainly used for short-circuit maintenance.
When the fuse is used for blocking purposes, the fuse must be installed.
|
|
Delixi inverter analog output fault analysis
The analog output of Delixi inverter is abnormal, and the operating frequency of the inverter does not match the output of the controller?
Solution(s):
First, you should determine what hardware is going wrong. Make the controller enter the manual debugging situation, respectively...
|
|
Delixi general inverter E100 series products introduction
E100 series products are a standard inverter with optimized open-loop vector control, V/F control, stable performance, rich functions, optimized structural design, exquisite appearance, and high cost performance.
Technical features:
...
|
|
Delixi quasi-sine wave voltage regulator application
There are also several types of quasi-sine waves, ranging from square waves, which are almost indistinguishable from square waves, to rounded trapezoidal waves, which are relatively close to sine waves. We're only going to talk about square waves, which are the waveforms that most commercially available high-frequency regulators can supply today.
...
|
|
Delixi product parameter unit VF and V difference
Voltage vf and v difference: The two have different meanings, vf on the battery represents the feedback voltage, while v represents the capacity of the battery, which is the unit of measurement of voltage. Lithium battery is a kind of battery with lithium metal or lithium alloy as the positive/negative electrode data and the use of non-aqueous electrolyte solution.
...
|
|
The difference between Delixi air switch and leakage protection switch
1. The role is different
The air switch is a kind of circuit breaker that protects the "object", which can protect the safety of the entire household wiring and electrical appliances and other items to prevent the wire from being burned due to overheating.
The leakage protection switch is a kind of circuit breaker that protects "people", which can be cut in time when leakage.
|
|
Delixi air switch object, structure, principle
Application of air switches (circuit breakers).
Delixi air switch, also known as circuit breaker. It is a switch that actively closes as soon as the current in the circuit exceeds the additional current. Air switch is a very important electrical appliance in the low-voltage distribution network and electric traction system.
|
|
Delixi E series inverter common fault analysis
Fault phenomenon, fault description, detailed description of troubleshooting measures
No display at power-on, no display, no display
Check whether the power wiring is correct; Check whether the 5V power supply is normal;
Check whether the keyboard is in good contact with the control board; Check whether the control panel and keyboard are normal.
If you use ...
|
|
Precautions for the use of Delixi leakage protector
1. If the two branch lines are connected, the current in the zero line flows to each other, which destroys the operating current balance in the zero sequence current transformer and causes the leakage maintainer to malfunction. If you want to use the neutral line of the power branch line as the neutral line of the lighting branch line nearby, it will cause the leakage of the power branch line.
|
|
Delixi relays and precautions
Quickness: It means that the maintenance device should be able to remove the short circuit as soon as possible, and its intention is to improve the stability of the system, reduce the damage to the peak equipment and lines, reduce the scope of the process, and improve the effect of active overlapping room and standby power supply or standby equipment active investment.
...
|
|
The reason why the Delixi switch socket is hot and hot
1. The quality of the socket is low
First of all, we should check whether the socket is a miscellaneous defective product, the copper clamping force in the defective socket is not enough, resulting in a poor connection between the socket and the plug, and the socket and plug will heat up after a long time of electrical use. Therefore, you must not buy cheap miscellaneous electric ...
|
|
Thermal calculation of Delixi linear regulator
Thermal accounting requires information such as power loss, thermal resistance of the package, and ambient temperature. The power loss is calculated in the same way as the efficiency accounting, which is simply the value of the difference between the output input voltage and the input current. Thermal resistance should have a technical standard documented, and if it is not available, it is necessary to consult the manufacturer. Basically...
|
|
Delixi inverter installation and wiring
1. The device of the inverter
1.1 The device environment requirements of the inverter
Ambient temperature - 10 °C - 40 °C;
Ambient humidity: The relative humidity does not exceed 90% (no condensation);
Other occasions requiring no direct sunlight, no corrosive gas and flammable gas, less dust, ...
|
|
Delixi voltage regulator fault phenomenon and analysis
Delixi regulator output voltmeter keeps swinging back and forth, and sparks occur at the carbon brush, and the problem phenomenon and cause analysis
1. The contact pressure between the carbon brush and the coil plane is too small
2. The carbon brush is severely worn
Delixi voltage regulator has ...
|
|
Contact
working hours
