Support voltage source

FIELD: electric engineering.

SUBSTANCE: support voltage source has first and second amplifiers 5, 6, two power sources 7, 8 of opposite polarity, first and second resistors 1, 2, connected serially and connected between common point 7, 8 and inverse input 5, connected to output 6, and serially connected third and fourth resistors 3, 4, which are connected to middle point of resistors 1, 2 and to output of amplifier 5, inverse amplifier input 6 is connected to middle point of resistors 3, 4, while non-inverse inputs of amplifier 5, 6 are connected by common point 7, 8. as first and fourth resistors a non-linear element is connected, having volt-ampere characteristics of voltage stabilizer. As resistor 2 or 3 non-linear element is connected, having volt-ampere characteristics of current stabilizer.

EFFECT: simplified construction.

2 cl, 4 dwg

 

The invention relates to the field of electrical engineering and can be used in particular for forming the reference, the reference voltages in the analog-to-digital and digital-to-analogue converters.

A device on the reference voltage on the basis of the Zener diode, in which a Zener diode and a ballast resistor included in the first arm of the bridge, as another arm of the bridge are two series connected resistor. The bridge is balanced by reaching his negative feedback through a differential DC amplifier (Horowitz, Whill, Art circuitry, M., “World”, 1998, s).

Known constant temperature anemometer, containing the first chain, consisting of two series-connected resistors R1, R2, one of which is the sensitive element, the second chain, consisting of two series-connected resistors R3, R4, the first and second amplifiers, and the output of the first amplifier connected to the first chain, the other end of the chain is connected to a common feeding point, to which is also connected to the noninverting inputs of the amplifiers, to the connection point between the resistances of the first chain is connected to the second chain, the other end of which is connected to the output of the second amplifier, whose input is connected to the output of the first amplifier, inverters is th the input of the first amplifier is connected to the connection point between the resistances of the second chain, moreover, the condition of balance is described by the expression: KR1R3=R2(R4-KR3-KR1), (EN 2137139, C1, 10.09. 1999).

The closest in technical essence to the proposed source is a bipolar voltage source that contains voltage regulators positive and negative polarity, performed respectively on the first and second operational amplifiers, and the outputs of the amplifiers are the outputs of the respective voltage regulators, the output of the first amplifier through the Zener diode and resistor connected respectively to the inverting inputs of the first and second amplifiers, the output of the second amplifier through the resistors connected to the input of the first amplifier and non-inverting input of the second amplifier is connected to the common source output, and between reinvestiruet the input of the first amplifier and the inverting input of the second amplifier, an additional resistor (SU, A.S. USSR №875362, 23.10.81).

A disadvantage of the known device is that the functionality is limited due to the use of only one element with a volt-ampere characteristic of the voltage regulator (Zener) and relative complexity.

The technical result of the proposal is to expand the functionality of the device by using elements from the current-voltage characteristics as the article is of bilister voltage, and current regulator, as well as simplifying the device.

The technical result is achieved by the fact that the source of reference voltages, containing the first and second amplifiers, dual power supplies, the first and second resistors connected in series and connected between the common point of the power source and the inverting input of the first amplifier connected to the output of the second amplifier and serially connected third and fourth resistors, which are connected to the midpoint of the first and second resistors and to the output of the first amplifier, the inverting input of the second amplifier is connected to the middle point of the second and third resistors, and the noninverting inputs of the amplifiers are connected to a common point sources of supply, at the same time as the first or fourth resistors included nonlinear element having a volt-ampere characteristic of the voltage regulator.

In addition, in another case, instead of the second or third resistors enabled element having a volt-ampere characteristic of the current regulator.

Figure 1 shows the schema of the source of the reference voltage element having a volt-ampere characteristic of the voltage regulator.

The device comprises resistors 1, 2, 3, 4, amplifiers 5, 6, power supplies 7, 8.

Let the first resistor included non-linear element having the'olt-voltage characteristic of the voltage regulator - the Zener diode. The device operates as follows. When the supply voltage from the power sources 7, 8 on the amplifiers 5, 6 output voltage of the amplifier 6 is fed to a chain consisting of a Zener diode 1 and the second resistor. After the “breakdown” of the Zener diode its static resistance R1=East/I, where R1 is the static resistance of the Zener diode, East, I - respectively the voltage and current of the Zener diode, due to the nonlinearity of the current-voltage characteristics (figure 3) will change (decrease) up until the bridge device formed by the Zener diode 1 and the resistors 2, 3, 4, are balanced: KR1·R3=R2(R4-KR3-KR1), (1) where K is the gain of the amplifier 5, R1 - static resistance of the Zener diode, R2, R3, R4, respectively the resistance values of the second, third and fourth resistors. After reaching equilibrium the specified bridge on the outputs of the amplifiers 5, 6 will set the reference voltage of the opposite polarity. To ensure high stability of the reference voltage, the resistance value of the resistor 2 is chosen such that the current flowing through the Zener diode, consistent with thermostable point of its volt-ampere characteristic. In the result, the output voltage of the source will have metrological parameters, practically not inferior to the parameters of the Zener diode. If according to the level of the s (1) to establish the gain of amplifier 5 K=1, the output voltage of the source will be equal in magnitude and opposite in sign. If It≠1, then for each value of “K” at the outputs of the source will be set to the corresponding values of the voltages in a wide range, including the output of the amplifier 5, the voltage of negative polarity may be smaller in magnitude than the voltage of the “breakdown” of the Zener diode.

Similarly, the device operates in the case of use as a resistor element R4, having a volt-ampere characteristic of the voltage regulator.

2 shows the diagram of a device that implements the reference voltage by using an element having a volt-ampere characteristic of the current regulator, in this example, the field of the triode.

The device comprises resistors 1, 2, 3, 4, differential amplifiers 5, 6, power supplies 7, 8, and as the second or third resistors enabled element 3, having a volt-ampere characteristic of the current regulator, for example a field triode. Consider the case where the field triode included in the device instead of the second resistor. The device operates as follows. When applying to the amplifiers 5, 6 voltages from sources 7, 8 output current of the amplifier 6 will flow through the first resistor and field triode 2. Due to the nonlinearity of the current-voltage characteristics of olevaga of the triode (see 4) its resistance R2=U/ICT, where U is the output voltage of the amplifier 6, and Telecom - current of the triode field, will change until then, until the balance of the bridge device, consisting of a triode field 2 (R2) and the resistor 1, 3, 4. As before, the equilibrium equation has the form (1).

At the outputs of amplifiers 5, 6 when K=1 are equal (modulo) of the reference voltage of the opposite polarity. Resistance 1 is selected of such size that the current field of triode matched thermostable point of its volt-ampere characteristic. When the value of the transmission factor of the amplifier 5 To≠1, the output voltage of the reference voltage as described above, can take different values.

Similarly, the reference voltage will work if you switch element, having a volt-ampere characteristic of a current regulator (field triode) as the third resistor.

The proposed voltage reference scheme is easier to prototype and can be built not only on the basis of the Zener diode, but also on the basis of the triode field.

Thus, the application of this proposal nonlinear elements having characteristics of voltage or current (in addition to the above it can be stabistor, thermistors, hid a hundred of ilistory, barratry and others), extends the functionality of the device. In addition, it is easier closest analogue (contains fewer resistors). According to the scheme proposed device may be constructed of bipolar secondary power sources, precision reference source voltages for the analog-to-digital and digital-to-analogue converters.

1. A source of reference voltages, containing the first and second amplifiers, dual power supplies of opposite polarity, the first and second resistors connected in series and connected between the common point of the power source and the inverting input of the first amplifier connected to the output of the second amplifier, and serially connected third and fourth resistors, which are connected to the midpoint of the first and second resistors and to the output of the first amplifier, the inverting input of the second amplifier is connected to the middle point of the second and third resistors, and the noninverting inputs of the amplifiers are connected to a common point of the power source, wherein the first or fourth resistors included a nonlinear element having a volt-ampere characteristic of the voltage regulator.

2. A source of reference voltages according to claim 1, characterized in that as the second or third resistors included non-linear element having the'olt-ampere characteristic of the current regulator.



 

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