SU1704143A1 - Pulse current regulator - Google Patents

Abstract

The invention relates to electrical engineering, in particular, to the conversion of a constant voltage to a constant, and can be used in the construction of constant voltage and current stabilizers. The purpose of the invention is to improve the accuracy of the adjustment characteristic. The goal is achieved by introducing adder 13 into the controller, which improves the accuracy of the adjustment characteristic during controller synchronization. 4 sludge.

Description

The invention relates to a converter technique, in particular to the conversion of a constant voltage to a constant one, and can be used in the construction of constant voltage and current stabilizers.

The purpose of the invention is to improve the accuracy of the adjustment characteristic.

FIG. 1 shows a block diagram of the device: FIG. 2 is a timing diagram of the current of a conventional relay controller (the dotted lines show the switching thresholds of the controller transistor); in fig. 3 and 4 are timing diagrams of regulator currents with synchronization of unlocking and locking pulses, respectively (the dotted line shows the off and on thresholds).

The regulator (figure 1) contains a capacitor 1 connected to the input terminals 2 and 3, between the reverse diode 4 and the inductor 5 is included resistive current sensor 6, a capacitor 7 connected to the output terminals 8 and 9, a switch 10 connected between the first input pin 2 and the connection point of the outputs of the diode 4 and the current sensor 6, the second input 3 and output 9 of the output and the second output of the reverse diode 4 are connected to a common bus, rectifier 11, whose input is connected to the first output terminal 8, filter 12, the input connected to the output of the rectifier 11, the adder 13 voltage, the inputs of which are connected to the output of the filter 12 and the source of the reference voltage, and the output is connected to the second input of the relay element 14. the first input of which is connected to the common point of the key 10, current sensor 6 and reverse diode 4. and the output to the control output of the key 10 The diode 11 and the filter 12 are combined into a rectifier assembly 15 with a filter.

The regulator works as follows.

Input 1 and output 7 capacitors, switch 10, choke 5, reverse diode 4, current sensor 6 form the power part of the regulator. The synchronization frequency fo must be higher than the natural frequency of the power part of the controller

Yo

ABOUT

Ј Ј

with

1 Alas Re 4 AUL where VBx is the input voltage;

Re is the resistance of current sensor 6; D U is the spurious hysteresis loop of the relay element 14;

L - throttle inductance 5.

Depending on which sync pulses are applied to the device: unlocking the power transistor 10 or locking it, either the upper value of the regulator current (throttle) or the lower current (Fig. 3 and 4) is stabilized. In this case, the variable component of the current droplets of 5 A is unstable and depends on the values of the input Vex and output VBWX voltages

A (Uvh Uvyh Totkr (Uvh - Uvyh) -Uvykh-T

 VBX-L

t - t "- out

Totcr -qT, q ---}

where Totcr is the key open time;

q is the pulse filling factor; T is the working period of the regulator; Veux is the output voltage. The average value of the current regulator

1cp 1 (in (y) ± |.

where 1v (n) is the upper (lower) stabilized value of the current of throttles 5.

Accordingly, the average value of the output current of the regulator is unstable due to the unstable addition of A / 2. To compensate for this additive, a rectifier 11, a filter 12 and a voltage adder 13 are used. Rectifier 11 isolates the voltage on choke 5 at the time of the open state of the key; VAP - OOX - VBx, when the key is closed, the rectifier diode is shifted in the opposite direction and there is zero voltage at its output.

The average value of the output voltage of the rectifier 11 is thus equal to

w l / and h „- (Uvh-VHh) -Wye Ve.cp (Vvh VBX) Q ---- n-L ---

 in

Ve.cp is equal in magnitude, but opposite in the D sign. Filter 12 extracts this average value and transmits it to adder 13, which with an appropriate weighting factor adds (subtracts)

five

10 15

20

25

thirty

35 40

45

0

its to the reference voltage, compensating, thereby, unstable increase in the variable component of the current.

Thus, the proposed controller has a stable average output current. Sync pulses can be both unlocking and closing. A change in the type of pulses entails only a change in the polarity of the switching on of the rectifier diode, and the principle of operation of the regulator is preserved.

The proposed controller can be used in current and voltage stabilizers of medium and high power, in particular, in many cell power sources. Its use due to the synchronization of the operating frequency of the regulator with the external driving frequency in multi-cell power sources reduces the ripple of the output voltage and the level of electromagnetic interference while maintaining its high accuracy characteristics.

Formula of the invention. Pulsed current regulator containing input and output capacitors connected respectively to the input and output pins and the common bus, connected in series between the input and output pins key, current sensor and choke, reverse diode connected between the common bus and the power connection point a key and current sensor, a relay element, an output connected to a control output of a key, and a first input - to a common point of a current sensor and throttle, a rectifier with a filter, connected by one input terminal m with a common point of power output of the key, current sensor and reverse diode, and the other with the output output, and the source of the reference voltage, characterized in that, in order to improve the accuracy of the regulating characteristic, an adder is inserted into it, the inputs connected to the outputs of the rectifier with the filter and the source of the reference voltage, and the output to the second input of the relay element, to which the input pin is also connected to connect the source of clock pulses.

g

Si

j

Phi 2

Fig.Z

Claims (1)

FORMULA AND PORTRAIT ¹ A pulse current controller containing input and output capacitors connected respectively to the input and output terminals and a common bus, a key, a current sensor and a choke, a reverse diode connected between the common bus and the connection point between the power terminal of the key and the current sensor, connected in series between the input and output terminals , a relay element connected by an output to the control terminal of the key, and the first input to a common point of the current sensor and inductor, a rectifier with a filter connected by one input terminal to a common point of power key output, current sensor and reverse diode. and another with an output terminal, and a reference voltage source, characterized in that, in order to increase the accuracy of the control characteristic, an adder is inserted into it, with inputs connected to the outputs of the rectifier with a filter and a reference voltage source, and the output to the second input of the relay element, to which the input pin is also connected to connect the clock source. Fig.Z Figure 4 t