Using a diode as a fuse

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Using a diode as a fuse

The diode is in the fuse box under the hood on the right side of the engine conpartment The diode is in the fuse box under the hood on the right side of the engine conpartment. A bad diode can cause the 10a fuse to blow.

On a Ford Explorer Sport Trac : The PCM diode is located in the Power Distribution Box in the engine compartment on the drivers side it is in location 53 The PD Box is " live " Alsoin the fuse panel located in the drivers end of the dash the fuse panel cover is visible with the drivers door open fuse 19 is a 25 amp fuse for the PCM power diode.

There must be a break in the power supply elsewhere in the circuit. I suggest a blown fuse The only diode that generates electricity is a solar cell. It depends on how the diode is damaged. There are generally two cases. One, the diode is shorted, and conducts with a low impedance in both directions. The other, the diode is open, and does not conduct, having a high impedance, in both directions. The effect depends on the particular circuit. In a power supply, a shorted diode will often blow the fuse, while an open diode will result in no output, or in high ripple voltage output.

Is it possible that diode has normal voltage output but wrong current,meaning low mA? To test an ordinary semiconductor diode use a multimeter to verify that it conducts in one direction but not in the other. Testing of other types of diodes e.

Is the number 30 on the fuse? This refers to the amperage that the fuse can take. If your looking for what a particular fuse connects to, usually you can find a key on the door of the fuse access panel. Otherwise, try contacting the dealer. A diode is a device that allows current to flow through it in only one direction. A semiconductor diode is a diode that is created with solid state technology.There are many different kinds of diodes, and each one serves a different purpose as an electronic component.

The resulting light is referred to as electroluminescence. Photodiodes conduct only when they are exposed to light. These can be useful in making projects with a light activated switch, so that a circuit in only active in the presence of light. Zener diodes are designed to conduct in the reverse direction, only when something called the breakdown voltage is reached will the circuit conduct. These are dialed to precise tolerances, see the section on Zener Diodes in step 3. Rectifier diodes are designed to stop electricity from flowing in the wrong direction.

Diodes are sometimes known as rectifiers for their use to rectify alternating current electricity into direct current, by removing the negative portion of the current. Schottky diodes are designed to turn on and off very rapidly when the breakdown voltage is reached, responding quickly in digital circuits.

When current flows through a diode there is a very small voltage drop across the terminals. Silicon diodes have a voltage drop, or loss; a Schottky diode voltage drop is significantly less. This lower voltage drop enables higher switching speed and better system efficiency. Diodes can be used in a number of ways, like to protect a current-sensitive circuit.

The diode will stop the reversed current from traveling from the battery to the rest of the circuit-- thus, the diode protects the sensitive electronics inside the your circuit. In the next few steps, you will find information about some of the most commonly used kinds of diodes. A light-emitting diode or LED lights up when electrically biased in the forward direction. This effect is a form of electroluminescence.

A LED is a special type of semiconductor diode. Charge-carriers are created by an electric current passing through the pn-junction, and release energy in the form of photons as they recombine. The wavelength of the light, and therefore its color, is dictated by the materials forming the pn junction, which elements doped the pure material. A normal diode, emits invisible far-infrared light, but the materials used for a LED have bandgap energies corresponding to near-infrared, visible or near-ultraviolet light.

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When the voltage across the pn junction is in the correct direction, a significant current flows and the device is said to be forward biased. The voltage across the LED in this case is fixed for a given LED and is proportional to the energy of the emitted photons. If the voltage is of the wrong polarity, the device is said to be reverse biased, very little current flows, and no light is emitted.

The semiconducting diode is encased in a solid plastic lens.Engineers sometimes have the tendency to over complicate a problem instead of focusing on simple logical solutions. It turns out that this was all done in vain. In electronics, what might seem like a large problem can sometimes have an easy solution. For example, when designing PCBs that have mechanical relays, you can avoid large voltage spikes and provide relay noise suppression by adding a flyback diode to your circuit.

However, when you have placed a flyback diode on a relay for flyback protection and your controller still keeps resetting, you might need to consider other sources of electrical noise.

The use of a diode in a relay circuit prevents huge voltage spikes from arising when the power supply is disconnected. A flyback diode is sometimes called flywheel diode, freewheeling diode, relay diode, or snubber diode as a flyback diode circuit is a type of snubber circuit. The speed at which current can change in an inductor is limited by its time constant.

In this case, the time it takes to minimize current flow through the coil is longer than the time it takes for the power supply to be removed. This causes a huge voltage potential to build up on the open junctions of the component that controls the relay. This voltage built up is called flyback voltage. It can result in an electrical arc and damage the components controlling the relay.

It can also introduce electrical noise that can couple into adjacent signals or power connections and cause microcontrollers to crash or reset. To mitigate this issue, a diode is connected with reverse polarity to the power supply.

When the power supply is removed, the voltage polarity on the coil is inverted, and a current loop forms between the relay coil and protection diode; the diode again becomes forward biased.

Tiny flyback diodes prevent huge flyback voltage from damaging your components. The placement of a flyback protection diode is rather simple; it should be placed directly across the relay's coil.

A schematic for a freewheeling diode circuit in a relay is shown below. Flyback diode wiring in a relay circuit. Note that the placement of the diode does not prevent a voltage spike from travelling to some downstream load.

Instead, it provides a path with low resistance that reroutes the current, thus the voltage spike at the downstream load will be much lower. Using a simple 1N diode is sufficient to suppress large voltage spikes in a 24VDC relay with a diode protection circuit. The current path in the diode depends on whether the switch in the relay is closed or opened. Once the switch is opened, the back electro magnetic field created by the inductor switches direction and points towards ground, creating a transient response that slowly dies off.

Thanks to the low resistance loop created by the freewheeling diode in forward bias, current is diverted through the diode rather than creating a large voltage spike elsewhere in the circuit.Search for the part s number you wish to receive samples.

Or, visit the sample center page. Designed to meet the general requirements of commercial and industrial applications by providing low trr, high-temperature, low leakage and low forward voltage drop products.

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using a diode as a fuse

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It only takes a minute to sign up. I'm trying to source some fast-blow 5mA or 10mA fuses but Littelfuse has discontinued the only reasonably affordable ones I have found. My circuit when operating properly will not output more than 2mA, however I'd like to ensure if it fails nothing will go over 5mA or 10mA.

How-To: Diodes

Could I substitute something like this current limiting diode instead? Sure, if you have DC, can live with the V rating, and don't mind losing a few volts across the "fuse". If you're trying to protect something exquisitely sensitive keep in mind that any kind of significant capacitance after the 'fuse' can produce a lot of fault current irrespective of any supply limits. If your power supply is say 30V maybe an op-amp supply and you use a current limiting diode of 10mA, if the circuit you wish to protect went short circuit, the power dissipation in the diode would be mW and might exceed limits for the device.

The other problem is that a current limiting diode will "lose" a volt or two in normal operation so you will inevitably reduce your power rail by this amount in normal operation:. Yes you can, but you'll need to change your design. The problem is that, while a fuse typically has a resistance of a few ohms or less, CLDs have significantly larger equivalent resistances. In the case of the 4 mA CLD you refer to, at lower currents it behaves pretty much like a 1k resistor.

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For a "normal" output of 2 mA, this obviously means that you will lose about 2 volts. You can get around this easily enough by incorporating the CLD inside a feedback loop, such as.

using a diode as a fuse

And if you're using 3. For 3. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Is it reasonable to use a current limiting diode in place of a fuse? Ask Question.How many emails do you send out a day.

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using a diode as a fuse

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using a diode as a fuse

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