Questions tagged [full-bridge]

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27 views

Six-step (trapezoidal) BLDC motor driving strategy

It seems that a common driving strategy for such a motor is to use the 3 half-bridge topology depicted above, and use PWM to regulate speed and/or torque. At any given moment, two phases ("wires&...
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16 views

Xl4061 board problem

I am building an amp for 6th order subs which is based on two transformers which have around 25 VAC, and I am trying to rectify them for 2 subwoofer module filter boards (12-32vdc) and for two TDA7498....
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1answer
53 views

H Bridge vs Half Bridge current sense

Are there any disadvantages in measuring H Bridge current only via 1 shunt resistor? Since it will be made by hand on a perf board the only disadvantage will be the possible longer wires that connect ...
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48 views

How to drive MOSFET switches in a cascaded hybrid modular multilevel converter using a half-bridge driver “IR2103S”

I am trying to drive the MOSFET switches in a cascaded hybrid modular multi-level converter as shown in Fig. 1. Fig. 2 is used here to simplify the circuit and to present the problem (let's focus on ...
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64 views

Pitfalls of using only two diodes in a “full wave rectifier”?

Scenario: I have a small signal from a Piezo element which I am amplifying using a fully differential amplifier. Thus, my gained output from this In-amp are "two" (sine) waves inverse of ...
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85 views

How do you find the peak-to-peak ripple voltage of a full wave bridge rectifier?

The 32VRMS secondary of a transformer feeds a full wave rectifier and capacitor filter as shown in the circuit The peak-to-peak ripple of the output voltage of this circuit needs to be less than 1V ...
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1answer
43 views

Calculation of switching transformer at 100kHz

I am not able to desgin transformer for switching frequency 100kHz. It´s easy to desgin usual transformer for 50 Hz. But I´m totaly out when comes to switching transformers. What material should I use?...
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1answer
125 views

what does this bulb need to work properly in this circuit?

This is the circuit, before it was working, but not anymore. I have an identical circuit and its ulb still working. I don't know where is the problem. (https://i.stack.imgur.com/fPpZW.jpg)
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2answers
30 views

Output Voltage Ripple Considerations

I'm working on a full bridge dc-dc converter, following the instructions on power supply cookbook. It has a 350V output and 2kW total power, 30kHz switching frequency I choose inductor current ripple ...
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1answer
28 views

What's the purpose of components in these mosfet driver

I see these double ended transformer drivers on many places, I know the working principles of these gate drive transformers but still don't have an idea about external components that I've marked with ...
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3answers
86 views

How to run a DC device through 3 phace 400V AC mains?

So I need to put a wifi antenna on farmland, the issue is that the antenna needs 12V DC powered over Ethernet and the only power source nearby is a 3phase 400V AC one... So is there something like a ...
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1answer
56 views

Why does the output voltage after full bridge drop so many?

recently I am researching the piezoelectric transducer (PET), which can convert the mechanical energy into electricity. And I found a strange phenomenon. I used the 10MΩ probe of oscilloscope to ...
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0answers
52 views

How do I calculate the conduction angle in an uncontrolled three-phase full-wave bridge rectifier?

Basically I to calculate the conduction angle of the rectifier, with RLE load, I was taught to use some formulas and a plot but I not really how to calculate it from scratch, if you could explain it ...
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2answers
82 views

How do I calculate the average voltage of this wave?

I need to calculate the average voltage of the wave below, the DC voltage is 120 V , the curve starts at 21.65 degrees and the peak voltage is 325.269 V. The solution is 221.3 V. This is from a ...
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1answer
256 views

How to design this filter?

I've a full bridge dc-dc converter and I'm trying to understand it. It has 48V input and 400V output with 1600W rating, 30kHz switching frequency. At the input of this SMPS there's a filter ...
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1answer
123 views

How can I get rid of this distortion?

I'm trying to build a 16kHz single phase, full bridge PWM inverter, Vdc=380V, 2kVA rated. When I load the inverter a little bit, the output voltage waveform is looks like this: simulate this circuit ...
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106 views

Type 3 Compensation on Full Bridge DC-DC Converter with SG3525

I'm trying to build a 48V-400V full bridge dc-dc converter. I'm using sg3525 as pwm IC and trying to get isolated feedback from output and planing to do it with TL431. When I study on it people are ...
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2answers
179 views

LTspice transformer voltage course problems at low duty cycle

I am trying to simulate full bridge SMPS in LTspice where I can change the input voltage to the voltage regulator (LT317) by changing the pulse width of the PWM signal at the MOSFETs. Everything ...
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1answer
73 views

Forward Voltage VF Max 1V does this mean that the full wave w10 bridge rectifier can only allow 1 volts via it

I want to use a full-wave bridge rectifier. My circuit needs 2 amps of current and operates at 12volts (12V @ 2A). I found this https://www.tanotis.com/products/vishay-2w01g-e4-51-bridge-rectifier-...
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43 views

How do I calculate deformant and real power of this circuit?

I have this circuit, the load is RL: I need to calculate the apparent, real, reactive and deformant power assuming L is very large. Since L is very large that means Q= 0 var and Pload=~Uav*Iav and S=...
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2answers
847 views

Dead-time in Full Bridge Inverter (LTSpice Simulation)

I am trying to generate a dead time between two switching legs in the conventional full bridge inverter. However, by simply including the delay block for one pair of switches - just shifts the signal ...
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2answers
85 views

In a half-wave uncontrolled rectifier with RL load why does the voltage spike when current reaches 0A?

I understand that the inductor creates a negative voltage to oppose the change in current but I don't understand why the voltage spikes up instantly when the current reaches 0A.
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2answers
213 views

Capacitor in parallel with relay coil backfires on contacts

I've got a smoothing capacitor(2,2uF) C1 in parallel with relay coils inside a fullwave diode bridge. When the circuit is closed through contacts in pre-relay RLY1 it first gives me, almost everytime ...
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61 views

How to validate an SMPS transformer?

From UCC28950 webench design data I have approached a vendor for making a transformer for Phase shifted Full Bridge DC -DC converter. Now before giving order to vendor, I want to gather data on how to ...
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95 views

3-phase rectification using individual step down transformers for each phase

I'm looking make a simple low-voltage DC power supply from a 3-phase supply. Looking into 3-phase rectifiers I came across the below articles https://www.gprectifier.com/news/rectifier-11261763.html ...
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1answer
57 views

Average Voltage of a 3phase full wave bridge diode rectifier derivation

Why three phase bridge rectified waveform is integrated over the half period \$\pi/6\$\ to find the average voltage? Should it not be integrated over \$\pi/3\$\, as the wave form repeat itself after \$...
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1answer
159 views

Transfer function of full bridge inverter using mosfet and LLC circuit

I'm new at deriving transfer function and trying to derive the same for following circuit. It contains full bridge inverter circuit with input as 50 Vdc (50% duty cycle used to drive MOSFETs). Output ...
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1answer
228 views

Schottky diodes as full bridge rectifier

I need to make a 75-100VDC high current power supply. I do not have any high current diodes or bridge rectifier ICs but I do have a load of scrap switching power supplies. Could I take 4 of the (lack ...
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1answer
127 views

Arduino died when grounds got disconnected

Alright bear with me since English is not my first language and it's my first time posting here. So I was using my Arduino Nano (not genuine) to drive a single phase full bridge rectifier. The ...
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76 views

spike in the Full bridge SMPS

I have a full bridge SMPS and I am measuring the voltage across the output´s diodes on the secondary side. As you can see the voltage spike changes by changing the output current, for example at zero ...
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3answers
295 views

Incorrect operation of the Allegro A3941 driver

I use the Allegro A3941 driver in these modes: At very low duty cycle (<10%)PWM motor consumes 0.05 A and produces a squeak. If you increase the PWM duty cycle of the PWM to 10% the squeak ...
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3answers
218 views

Why is this camping light deadly?

I am learning, so go easy on me, if you can. In a video with BigClive, he takes apart a camping light and says it's deadly when you have mains plugged in and usb plugged in at the same time. In that ...
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1answer
276 views

How to select high frequency rectifier capacitor?

Can I use aluminium electrolytic capacitor after a full bridge rectifier? My operation frequency is 200 kHz with output voltage of 100 V. Based on this paper: "Analysis and Design of Load-...
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1answer
257 views

SG3525 Closed Loop Inverter Waveform Problem

I'm using a sg3525 ic on a full bridge dc-dc converter in closed loop. The system is working fine, I don't have a problem with it. Output is just like what I want. The problem is inverter part's ...
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1answer
74 views

3 Phase calculations

I have 3-phase utility mains power supply whose phase voltage is 220 V, 50 Hz. I keep getting confused about various calculations of the 3-phase mains as follows: Formula for the line voltage. ...
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1answer
563 views

Smoothing cap vs filter for full wave bridge rectifier circuit

I am designing a circuit which requires high-voltage DC. My plan is to step-up my mains (120VAC) with a transformer and then pass that through a FWB. After the FWB, I want to smooth the signal into a ...
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2answers
867 views

Single Phase Full Bridge Inverter - I Can't figure out which PWM Control Technique is used

I have the following Single Phase Full Bridge Inverter and a PWM control method which in my language is called "asymmetric mode". I understand how it works but I can't find any documentation written ...
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1answer
162 views

How does flux change polarity in full bridge SMPS transformer?

Take a full bridge switching circuit connected to the primary of a transformer. Assume: No load on secondary. Voltage into full bridge is DC. Duty cycle of switching is 50%. At t = 0, full bridge ...
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2answers
726 views

LTspice- Huge current spikes across MOSFETs in full-bridge inverter

I have designed a simple full bridge inverter in LTspice. The outputs for voltage and current are as expected however I have huge current spikes across the MOSFETs which I am using as switches and are ...
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2answers
148 views

Does using voltage regulator in power supply further reduces the rippling?

I want to build a 12 V DC power supply. Which one is a better approach? If I have a step down transformer 220/12 volt and after doing its full wave rectification and smoothing its wave using ...
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1answer
361 views

Best way to convert 48VDC to 220VAC Pure Sine

I'm trying to convert 48VDC(input could be battery or not), to 220VAC(Sine) I've searched a lot and found different topologies so I'm not sure about which one to use. I'm expecting to have a 1600W ...
0
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1answer
677 views

RC snubber on bridge rectifier (capacitor rating)

I am using a bridge rectifier on the mains and across each diode I have placed a RC snubber for EMI mitigation. (C is rated at 1Kv) My question is...on the C (from the RC snubber) should I use Y or X ...
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0answers
34 views

How can I drive a bridge with three states and two high-side switches?

I want to drive a configuration similar to the one presented in Figure 1 of A novel tri-state boost converter with fast dynamics, but use a MOSFET instead of the diode for efficiency. I want to put ...
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1answer
179 views

AC to DC power supply using full wave rectifier with 4 outputs

I simulated the circuit below with multisim and got the required values. [![enter image description here][2]][2] 1.25 to 22V using the poistive regulator -1.25V TO -22V using the negative ...
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1answer
59 views

How can a constant secondary side current cause a primary current to flow in a transformer?

This is a question which was originally asked by my power electronics professor but left unanswered. Suppose you are given the following system (kindly borrowed from this question) Suppose that: ...
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1answer
145 views

What does PA1 do in this schematic?

Original document:http://www.st.com/content/ccc/resource/technical/document/data_brief/group0/95/79/2a/ed/d0/a0/4f/46/DM00263698/files/DM00263698.pdf/jcr:content/translations/en.DM00263698.pdf The ...
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1answer
73 views

How does a filtering capacitor smoth a changing current? [duplicate]

Lets assume,in picture blow, the current be in its peak voltage moment. then when the current begins to fall (assume a moment after the peak moment) we know the current is blocked by diodes (actually ...
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2answers
3k views

Smoothing a Full-Wave rectifier voltage

I was reading about full-wave rectifiers and came across the schematics below which the capacitor C can smooth its voltage, but I didn't understand one case: We know that when the rectifier's voltage ...
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3answers
10k views

Connecting Voltage Regulators 7812 in Parallel for High Current [duplicate]

Could I use two L7812 voltage regulator ICs in parallel to get 12 volt and more current that with just one?
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1answer
118 views

Mistake in reading a rms voltage

I got a really strange result. I've build a full-bridge rectifier with a capacitor filter. And I used the following values \$\text{C}=500\cdot10^{-6}\$ and as a load \$\text{R}=1000\$. The maximum ...