What is the nature of the constant voltage source and what is the nature of the constant current sou

The constant voltage source is the ideal voltage source, and its properties or characteristics are twofold:

1) Its output voltage is constant and is not affected by the output current;

2) The current passing through it is not determined by itself, but by the resistance of the load connected to it.

In a constant voltage source, the output voltage does not change, and there is actually a current limit range, and the voltage also has a fluctuation error range. The simplest ones are series regulation, parallel regulation, three-terminal regulation, and switching regulation.

The nature of a constant voltage source is a power supply with a constant output voltage. In fact, there is a current limit range, and there is also a fluctuation error range for the voltage.

In circuits, a power supply with a constant output voltage is usually used. The part that guarantees constant voltage in the electronic circuit is called the constant voltage source, which is a type of power supply.

A constant voltage source circuit with an input, an output, and a wave-canceling circuit unit for generating a constant voltage without wave voltage at the output. The wave-canceling circuit unit comprises a resistor that is connected between the constant voltage source unit and the output terminal.

A wave voltage detection circuit unit is used for detecting the wave voltage and outputting a signal based on the detected wave voltage.

A current circuit unit is used to receive a signal from a wave voltage detection circuit unit and respond to the received signal to supply current to the output or absorb current from the resistor, thereby eliminating the wave voltage at the output.

The ideal voltage source has zero internal resistance, but in reality it is impossible to have zero internal resistance. There is also a current limit range, and the voltage also has a fluctuation error range. The simplest are series regulators, parallel regulators, three-terminal regulators, and switching regulators.

I never quote other people's articles.

A constant voltage source is a power supply with a constant output voltage. In fact, there is a current limit range, and there is also a fluctuation error range for the voltage. The simplest ones are series regulation, parallel regulation, three-terminal regulation, and switching regulation.

To quote, a constant voltage source is a constant voltage that remains stable when its output current changes.

Constant current, that is, the output current is constant, but the power supply current is not fixed, and the nominal voltage is only the upper limit of safety;

Constant voltage, that is, the output voltage is constant, but the output current is not fixed, and the nominal current is only the maximum upper limit.

The power adapters of most electrical appliances, such as mobile phones, laptops, etc., are constant voltage power supplies. Constant current power supply is mainly used in chargers, LED drivers, special power supplies for electrolysis reactions, etc.

It's a constant current, a constant voltage.

Constant current source, also known as current source, steady current source, a wide spectrum, high-precision AC steady current power supply. It has the advantages of fast response speed, high constant current accuracy, long-term stable work, and suitable for various loads (resistive, inductive, capacitive).

It is mainly used for detecting thermal relays, molded case circuit breakers, small short-circuits and production occasions where it is necessary to set rated current, action current, short-circuit protection current, etc.

Constant current source note:

The positive-phase input provides a 3V reference voltage through a regulator, which means that as long as the op amp is operating normally, the inverting input is also 3V. The current-limiting resistor connected to the inverting input is 1k, and the current-limiting resistor flowing through the current-limiting resistor can be determined by Ohm's law is 3mA (as shown.

In the circuit, the power supply with constant voltage output is often used, and the part that ensures the constant voltage in the electronic circuit is called the constant voltage source, which is a kind of power supply.

A spine of a constant voltage source circuit has an input end, an output end, and a wave cancellation circuit unit that is used for eliminating the wave voltage so that a constant voltage without wave voltage is output at the output end, and the wave elimination circuit unit comprises a resistor connected between the constant voltage source unit and the output end.

The wave voltage cracking detection circuit unit is used for detecting the wave voltage and outputting a signal according to the detected wave voltage.

the current circuit unit is used for receiving a signal from the wave voltage detection circuit unit and responding to the received signal to provide a current to the output terminal or absorb a current from the resistor, thereby eliminating the wave voltage at the output terminal.

The ideal voltage source has an internal resistance of 0, and it is practically impossible for the field mill to have an internal resistance of 0. And there is a current limit range, and the voltage also has a fluctuation error range. The simplest ones are series regulation, parallel regulation, three-terminal regulation, and switching regulation.

1. The functions are different.

The constant current source consists of two parts: a signal source and a voltage controlled current source (VCCS). The sinusoidal signal source uses direct digital frequency synthesis (DDS) technology, that is, the sinusoidal sampling data is continuously read from EPROM at a certain frequency, and the sinusoidal signal required by EIT is generated after conversion and filtering by DA.

A constant voltage source circuit has an input terminal, an output terminal, a constant voltage source unit for generating a constant voltage with a wave voltage, and a wave cancellation circuit unit for eliminating the wave voltage so that a constant voltage without wave voltage is output at the output end, and the wave cancellation circuit unit comprises a resistor connected between the constant voltage source unit and the output terminal.

2. The working principle is different.

A constant current source is a current source where the output current remains constant, and the ideal constant current source should not change due to changes in load (output voltage).

The constant voltage source is that when its output current changes, its terminal voltage remains stable, and the ideal constant voltage source is not changed due to the change of load (output current), does not change due to the change of input voltage, does not change due to the change of ambient temperature, and the internal resistance r is equal to zero.

3. The characteristics are different.

The constant current source circuit is the basis for being able to provide a stable current to ensure the stable operation of other circuits. That is, the constant current source circuit is required to output a constant current, so the device as the output stage should have volt-ampere characteristics with saturated output current. This can be achieved using BJTs or MOSFETs that operate in the output current saturation state.

In the case of allowable load, the output voltage of the constant voltage power supply is constant and will not change with the change of load. It is usually used in low-power LED modules. The constant voltage power supply is what we often call the regulated power supply, which can ensure that the voltage remains unchanged when the load (output current) changes.

The constant voltage source is what we often call a regulated power supply, which can ensure that the voltage remains unchanged when the load (output current) changes.

The constant current source can adjust its output voltage accordingly in the case of load change, so that the output current remains unchanged.

Constant current source: a circle and an arrow, an arrow in the circle, the two ends of the arrow are on the circle, and the direction is the same as the direction of the current.

Constant voltage source: a circle composed of a U, a capital letter U in the circle, plus and minus signs are marked at the outer connecting line.

a constant voltage source circuit having an input terminal, an output terminal, a constant voltage source unit for generating a constant voltage with a wave voltage, and a wave cancellation circuit unit for eliminating the wave voltage so that a constant voltage without a wave voltage is output at the output end, and the wave elimination circuit unit comprises a resistor connected between the constant voltage source unit and the output terminal.

The simplest constant current source is a constant current diode. In fact, the application of constant current diode is relatively rare, in addition to the constant current characteristics of constant current diode are not very good, the current specification is relatively small, and the high price is also an important reason.

Constant current source: an arrow in a circle, the two ends of the arrow are on the circle, and the direction is consistent with the current;

Voltage regulator source: a capital letter U in the circle, plus or minus signs at the outer connecting line.