KR100187936B1 - Anti-rectification circuit with analog indication meter control device in cross coil - Google Patents

Abstract

Disclosed is a half-wave rectifier circuit of a cross-coiled analog indicator control device with low power consumption, a small chip area, and no distortion of an output waveform.

The second constant voltage output from the second constant voltage generator and the two phase voltage waveforms having different phases generated by the phase voltage waveform generator are inputted, and the second constant voltage and the two phase voltage waveforms are compared with each other. The upper half voltage waveform having a value higher than the constant voltage is removed and the upper half voltage waveform having a value lower than the second constant voltage is inverted and output. The reference current output unit outputs a predetermined reference current according to the second constant voltage. The output current is supplied as a reference current by the reference current supply unit, and outputs the output current according to the phase voltage waveform inputted by the first and second half-wave rectifiers as output terminals based on the reference current supplied by the reference current supply unit, respectively. The inverted half-wave rectified output unit rectifies and outputs the output currents of the first and second half-wave rectifiers.

Description

Inverted half-wave rectifier circuit of cross coil type analog indicator controller

The present invention is a cross-coil analog indicator control device, converting a signal of a predetermined frequency into a predetermined voltage in the frequency / voltage converter, and then inverted half-wave waveform generated by the function generator and the half voltage waveform generator An inverted half wave rectifier circuit for rectifying and outputting.

More specifically, by applying the principle of the current mirror, compare the reference voltage and the phase voltage waveform set to ground if the input voltage waveform is larger than the reference voltage, and if the input voltage is smaller than the reference voltage, the output is reversed to reduce power consumption. In addition, the present invention relates to an inverted half-wave rectifier circuit of a cross-coil type analog indicator control device capable of minimizing chip area and preventing distortion of an output signal waveform.

1 is a block diagram showing a part of a general cross-coil type analog indicator control device.

Here, reference numeral 1 denotes a first constant voltage generator operating with an operating power source B + to generate a constant voltage at a predetermined level, and reference numeral 2 denotes a second constant voltage operating according to a constant voltage generated by the first constant voltage generator 1. For example, the second constant voltage generator generates a 1/2 constant voltage of the first constant voltage generated by the first constant voltage generator 1.

Reference numeral 3 is a frequency / voltage converter which operates according to the first constant voltage generated by the first constant voltage generator 1 and converts and outputs a signal of an arbitrary frequency inputted into a DC voltage.

Reference numeral 4 is a function generator that operates according to the first constant voltage generated by the first constant voltage generator 1 and generates a voltage in a predetermined function form according to the output voltage of the frequency / voltage converter 3.

Reference numeral 5 is a half voltage waveform generator for generating a half voltage waveform (A) (B) in accordance with the output voltage of the second constant voltage generator (2) and the function generator (4).

Reference numeral 6 denotes an inverted half-wave rectifier circuit for inverting half-wave rectified and outputting the half-voltage waveforms A and B generated by the half-voltage waveform generator 5.

In the cross coil type analog indicator controller configured as described above, when the power source B + is applied, the first constant voltage generator 1 generates the first constant voltage and outputs the first constant voltage to the operating power source.

When a signal of a predetermined frequency is input in such a state, the input signal of the predetermined frequency is converted into a DC voltage by the frequency / voltage converter 3 and outputted, and the function generator 4 converts the output DC voltage into a predetermined function form. The voltage is converted to and output.

The second constant voltage generator 2 generates 1/2 constant voltage of the constant voltage generated by the first constant voltage generator 1, and the first constant voltage generator and the second constant voltage generator 2 in which the first constant voltage generator 1 is generated. The upper half voltage waveform generator 5 operates according to the generated second constant voltage, and the upper half voltage waveform A having a function form in which phases of the predetermined function type generated by the function generator 4 are inverted from each other. To B).

The half voltage waveform (A) (B) having a function form outputted by the half voltage waveform generator 5 is inputted to the inverted half wave rectifier circuit 6 to be inverted half wave rectified.

2 is a detailed circuit diagram showing a conventional inverted half wave rectifier circuit.

As shown in the drawing, the conventional inverted half wave rectifier circuit 6 uses two resistors Ra, Rb, two diodes D1, D2, and an operational amplifier OP1. 5) the upper half voltage waveform (A) (B), i.e., the input signal (Vi) of the functional form, is connected to be applied to the inverting input terminal (-) of the operational amplifier OP1 through the resistor Ra, and The connection point is connected to the output terminal of the operational amplifier OP1 through the diode D2 so that the non-inverting input terminal + of the operational amplifier OP1 is grounded, and the output terminal of the diode D2 and the operational amplifier OP1 is grounded. Is connected to the inverting input terminal (-) of the operational amplifier OP1 through the diode D1 and the resistor Rb so that the output signal Vo is output at the connection point of the diode D1 and the resistor Rb. It was configured.

In the conventional inverted half wave rectifier circuit configured as described above, the input signal Vi, which is the half voltage waveform A and B input from the half voltage waveform generator 5 while the power source B + is supplied, has its negative input signal. (Vi) is inputted to the inverting input terminal (-) of the operational amplifier OP1 through the resistor Ra. When the input signal Vi is a negative value, the operational amplifier OP1 outputs a positive value. Becomes

When the positive output signal V1 output from the operational amplifier OP1 is equal to or greater than the threshold voltage of the diodes D1 and D2, the diode D1 is in a conductive state, and the diode D2 is Since it is in the blocked state, the output signal Vo of the inverted half-wave rectifier circuit 6 is expressed by the following equation (1).

On the contrary, when the input signal Vi input from the upper half voltage waveform generator 5 is a positive value, the output signal V1 of the operational amplifier op1 becomes a negative value.

When the negative output signal V1 output from the operational amplifier op1 is equal to or greater than the threshold voltage of the diodes D1 and D2, the diode D1 is turned off and the diode D2 is turned off. Since the conduction state occurs, the output signal Vo of the inverted half-wave rectifier circuit 6 becomes OV.

However, the conventional inverted half-wave rectifying circuit as described above uses the operational amplifier OP1, and due to the large number of elements constituting the operational amplifier OP1, the design area of the chip is large and the operation of the operational amplifier OP1 is not limited. The required bias voltage had to be supplied, resulting in high power losses.

For the voltage at which the absolute voltage of the output signal V1 of the operational amplifier OP1 is less than the threshold voltage of the diodes D1 and D2, the waveform of the input signal Vi and the slew rate of the operational amplifier OP1 are slewed. rate, where the slew rate S is the maximum rate of change of the voltage V over time t, expressed as S = ΔV / Δt for the voltage change ΔV and the time change Δt. Therefore, when the slew rate of the operational amplifier OP1 is larger than the slew rate of the input signal Vi, waveform distortion does not occur in the output signal V1, and the slew rate of the operational amplifier OP1 is the input signal Vi. When the slew rate is smaller than, the distortion of the waveform occurs in the output signal V1 due to the distortion of the waveform in the output signal V1.

Accordingly, an object of the present invention is to provide an inverted half-wave rectifier circuit of a cross-coil type analog indicator control device having low power consumption, minimizing chip area, and no waveform distortion in an output signal.

According to the inverted half-wave rectifier circuit of the cross-coil analog indicator control device of the present invention having the above object, the second constant voltage output from the second constant voltage generator and the two phase voltage waveforms different in phase from each other generated by the phase voltage waveform generator Compare the second constant voltage and the two phase voltage waveforms as inputs, and remove the phase voltage waveform having a value higher than the second constant voltage and invert the phase voltage waveform having a value lower than the second constant voltage according to the comparison result. A reference current output unit for outputting a common resistance, a predetermined reference current according to the second constant voltage, a reference current supply unit for supplying a current output by the reference current output unit as a reference current, and the reference current Based on the reference current supplied by the supply unit, the output voltage according to the phase voltage waveform generated by the phase voltage waveform generator And an inverted half-wave rectifying output unit for converting an output current of the first and second half-wave rectifiers into a voltage and outputting the output current.

1 is a block diagram showing some components of a general cross-coil analog indicator control device.

2 is a detailed circuit diagram showing an inverted half-wave rectifier circuit used in a conventional cross-coil type analog indicator controller.

3A is a detailed circuit diagram illustrating a reference current output unit, a first half wave rectifier, a second half wave rectifier, and a reference current supply unit in an inverted half wave rectifier circuit of the present invention.

3b is a detailed circuit diagram showing an inverted half-wave rectified output unit in the inverted half-wave rectified circuit of the present invention.

* Explanation of symbols for main parts of the drawings

1: first constant voltage generator 2: 2nd constant voltage generator

3: frequency / voltage converter 4: function generator

5: half voltage waveform generator 6: inverted half wave rectifier circuit

61: reference current output unit 62: first half-wave rectifier

63: second half-wave rectifier 64: reference current supply

65: inverted half-wave rectified output unit Q1 to Q13: transistor

Vref: first constant voltage 1/2 Vref: second constant voltage

R1 ~ R7: Resistor A, B: Phase half voltage waveform

Hereinafter, an inverted half wave rectifier circuit of the cross-coil type analog indicator controller of the present invention will be described in detail with reference to the accompanying drawings of FIGS. 3A and 3B.

3A is a detailed circuit diagram illustrating a reference current output unit, a first half wave rectifier, a second half wave rectifier, and a reference current supply unit in the inverted half wave rectifier circuit of the present invention.

As shown in the drawing, the present invention is generated by the common resistor R1, the reference current output unit 61 for outputting a predetermined reference current according to the second constant voltage 1 / 2Vref, and the half voltage waveform generator 5, respectively. The first and second half-wave rectifiers 62 and 63 for outputting the output signal according to the upper half voltage waveforms A and B to the output terminal XO and YO, and the reference current output section 61 And a reference current output unit 64 for supplying a reference current to be output as a reference current for outputting an output signal to the output terminals XO and YO by the first and second half wave rectifiers 62 and 63. .

The reference current output unit 61 is connected such that the second constant voltage 1 / 2Vref is applied to the base of the transistor Q1, the constant current source I1 is connected to the collector of the transistor Q1, and the transistor Q2 is connected. The resistor R1 is connected to an emitter of the transistor Q2 through a resistor R2 so as to output a reference current from the collector of the transistor Q2.

In addition, the first output unit 62 and the second output unit 63, the half voltage waveform (A) (B) generated by the half voltage waveform generator (5) to the base of the transistor (Q4) (Q6). Are connected to be applied, constant current sources I1 (I2) and I3 are connected to the collectors of transistors Q4 and Q6, and are connected to the bases of transistors Q3 and Q5, and are connected to transistors Q3 and Q5. The resistor R1 is connected to the emitter of the resistor R3 through the resistor R4, and the output terminal XO (YO) is connected to the collector of the transistors Q3 and Q5.

In the reference current supply unit 64, the collector of the transistor Q2 of the reference current output unit 61 is commonly connected to the collector and base of the transistor Q9 and the base of the transistors Q10 and Q11, and the transistor Ground resistors R5, R6, and R7 are respectively connected to the emitters of Q9, Q10 and Q11, and the collectors of transistors Q10 and Q11 are connected to the collectors of the transistors Q3 and Q5. It is connected to the connection point of the output terminal XO (YO).

In the above, the values of the resistors R1 to R7 are R1 = R2 = R3 = R4 and R5 = R6 = R7.

3B is a detailed circuit diagram showing the inverted half-wave rectified output unit 65 in the inverted half-wave rectified circuit of the present invention.

As shown in the drawing, the inverted half-wave rectified output unit 65 of the present invention generates a predetermined current according to the output signals of the output terminals XO and YO of the first and second half-wave rectified units 62 and 63. Input stage current mirror composed of transistors Q12 and Q13 to output, and output stage current mirror composed of transistors Q7 and Q8 supplying a predetermined output current to the load resistor RL according to the output current of the input stage current mirror. The half-wave rectified voltage corresponding to the current of the output signal XO (YO) is output to the output voltage Vout using (Q7) (Q8).

The inverted half wave rectifier circuit of the present invention configured as described above has a second constant voltage (1 / 2Vref) output from the second constant voltage generator 2 and a phase half voltage waveform outputted by inverting phases from the phase voltage waveform generator 5. A) (B) is input and the second constant voltage (1 / 2Vref) is compared with the two phase voltage waveforms (A) (B), and according to the comparison result, a value higher than the second constant voltage (1 / 2Vref) is obtained. The half voltage waveforms (A) and (B) having the same value are removed and the half voltage waveforms (A) and (B) having a value lower than the second constant voltage (Vref) are inverted and output through the inverted half wave rectification output unit 65 of FIG. The second constant voltage (1 / 2Vref) output from the second constant voltage generator (2) and the half voltage waveform (A) (B) generated by the half voltage waveform generator (5) are the reference current output unit (61), A first crystal input to the bases of the input transistors Q1, Q4, and Q6 of the first half-wave rectifier 62 and the second half-wave rectifier 63, and generated by the first constant voltage generator 1; The three input transistor (Q1) (Q4) (Q6) by the voltage (Vref) are operated.

Here, the voltage applied to the emitter of the output transistor Q2 of the reference current output unit 61 is equal to the voltage between the base of the two transistors Q1 and Q2 and the emitter at the second constant voltage 1 / 2Vref. As the value is always a constant value, a constant current always flows through the emitter of the transistor Q2, and the emitter current of the transistor Q2 has a reference current of the output current output to the two output terminals XO (YO). do.

The emitter current of the transistor Q2 is expressed by the following equation.

Where Q2i is the emitter current of transistor Q2 and Qbe1 and Qbe2 are the voltages between the base and emitter of transistors Q1 and Q2.

The voltage applied to the emitter of the output transistor Q3 of the first half-wave rectifier 62 is the sum of the voltages between the base and the emitters of the two transistors Q3 and Q4 in the half voltage waveform A. According to the waveform A, the voltage across the emitter of the output transistor Q3 varies.

Here, when there is a difference in the level of the second constant voltage (1 / 2Vref) and the half voltage waveform (A), the same value is determined by the level difference between the second constant voltage (1 / 2Vref) and the phase voltage waveform (A). The voltage drops at the resistors R2 and R3 are different, and the currents flowing to the emitters of the transistors Q2 and Q3 are different from each other.

The emitter current of the output transistor Q3 is shown in Equation 3 below.

Where Q3i is the emitter current of transistor Q3 and Qbe3 and Qbe4 are the voltages between the base and emitter of transistors Q3 and Q4.

Since the transistors Q9 and Q10 of the reference current supply unit 64 are constituted by a current mirror between the collectors of the transistors Q2 and Q3, the current Q3i flowing through the transistor Q3 flows to the transistor Q2. When more than the current Q2i, the current corresponding to the difference flows to the output terminal XO connected to the collector of the transistor Q3.

Contrary to the above, when the current Q3i flowing through the transistor Q3 is less than the reference current Q2i flowing through the transistor Q2, the current is input from the output terminal XO connected to the collector of the transistor Q3. However, as shown in FIG. 3b, since the output terminal XO is a load terminal, no current can be supplied.

Therefore, when the current Q3i flowing through the transistor Q3 is less than the reference current Q2i flowing through the transistor Q2, no current flows to the output terminal XO, so the output current output to the output terminal XO is It is formulated as Equation 4 below.

Here, IXO is an output current of the output terminal XO.

On the other hand, since the two phase voltage waveforms (A) and (B) always have inverted values, current flows to the output terminal YO when no current flows to the output terminal XO, and conversely, to the output terminal YO. In the case where no current flows through), the current flows to the output terminal XO. Thus, the following Equations 5 and 6 are derived in the same manner as in the output terminal XO for the output terminal YO.

Where Q5i is the emitter current of transistor Q5, and Qbe5 and Qbe6 are the voltages between the base and emitter of transistors Q5 (Q6).

Here, IYO is an output current of the output terminal YO.

In this way, the output terminal XO (YO) of the first half wave rectifier 62 and the second half wave rectifier 63 outputs a half-wave rectified output current having a phase difference of 180 degrees.

As such, the output current output to the output terminal XO (YO) is input to the inverted half-wave rectified output unit 65 shown in FIG. 3B. The inverted half-wave rectified output unit 65 outputs the output terminal XO (YO). ) And the output current is input to the load resistor RL through the input stage current mirror composed of transistors Q12 and Q13 and the output stage current mirror composed of transistors Q7 and Q8. The voltage drop generated according to the current is output to the output voltage Vout.

That is, the output voltage Vout of the inverted half-wave rectified output unit 65 is the first half-wave rectifier 62 and the second half-wave rectifier 63 to the output terminal XO (YO), as shown in Equation 7 below. The half-wave rectified output voltage Vout is output according to the output current.

As described above, according to the inverted half-wave rectifying circuit of the cross-coil type analog indicator control apparatus of the present invention, since the half-wave rectification is performed only by the transistor and the resistor, it is excessively disadvantageous of the conventional inverted half-wave rectifier circuit composed of a conventional diode and an operational amplifier. Power consumption can be reduced, and waveform distortion of the output voltage, which can be caused by the large chip design area and the threshold voltage of the diode, can be minimized.

Claims (4)

A first constant voltage generator, a second constant voltage generator for generating 1/2 constant voltage of the first constant voltage generated by the first constant voltage generator as a second constant voltage, and a frequency / voltage for converting a signal of a predetermined frequency input into a predetermined voltage A converter, a function generator for generating a voltage in the form of a function according to the output voltage of the frequency / voltage converter, a half voltage waveform generator for generating a half voltage waveform in accordance with the voltage of the function in which the function generator is generated, and the half voltage A cross-coil type analog indicator control device having an inverted half wave rectifier circuit for inverting and outputting an inverted half wave waveform generated by a waveform generator, comprising: a common resistor; A reference current output unit configured to output a predetermined reference current according to the second constant voltage; A reference current supply unit supplying an output current of the reference current output unit as a reference current; First and second half-wave rectifiers configured to output an output current according to the half voltage waveform generated by the half voltage waveform generator based on the reference current supplied by the reference current supply unit; And an inverted half-wave rectifier output unit configured to convert an output current of the first and second half-wave rectifiers into voltage and output the voltage. The method of claim 1, wherein the reference current supply unit; And a current mirror to supply the reference current output from the reference current output unit to the first and second half wave rectifiers. The apparatus of claim 1 or 2, wherein the reference current supply unit; And supplying the reference current outputted from the reference current output unit to the first and second half-wave rectifiers at the same level. 2. The apparatus of claim 1, wherein the inverted half wave rectifier output unit; An input stage current mirror configured to input output currents of the first and second half-wave rectifiers; An output stage current mirror configured to output an output current of the input stage current mirror; And a load resistor for converting the output current of the output current mirror to a voltage and outputting the voltage.