KR0157159B1 - Function generator circuit - Google Patents

Abstract

The present invention relates to a function generator circuit that is used in a cross-coil type indicator driving device to enable a function generation control with a low reference voltage and a low DC input voltage in addition to unifying a DC input terminal. The function generator circuit of the present invention includes a reference voltage generator 11 for generating a predetermined reference voltage: an F / V converter 12 for receiving an input signal representing a vehicle speed and converting it into a corresponding DC voltage, and the reference voltage generator Multiple series-connected voltage divider resistors RF1, (RF2), (RF3), (RF4), (RF5), (RF6), (RF7), ( RF8): Current amplifiers S1, S2, and S3 which generate a sine function by comparing the voltage divided by voltage divider RF2, RF4, RF6, and RF8 with respective reference voltages. Sine function generator 20 consisting of (S4): a current amplifier for generating a cosine function by comparing the voltage divided by the divided resistors (RF1), (RF3), (RF5), (RF7) with each reference voltage Constant current source QS2, QC2 connected to the output of cosine function generator 20 and sine function generator 20 and cosine function generator 30, respectively consisting of (C1), (C2), (C3) and (C4). Is made of.

Description

Function Generator Circuit

1 is a perspective view showing the structure of a general cross-coil indicator.

2 is a schematic functional block diagram of a driving device of a conventional cross-coil analog indicator.

3 is a detailed circuit diagram of FIG.

4 is a functional block diagram of a function generator of a cross-coil type indicator driving device of the present invention.

5 is a detailed circuit diagram of FIG.

* Explanation of symbols for main parts of the drawings

1: Waveform 2, 12: F / V Converter

3: Sine function generator 4: Cosine function generator

5, 6: output circuit part 7, 8: coil

9, 11: reference voltage generator 13: voltage divider resistance

14: 1/2 reference voltage generator 20: sine function generator

32: cosine function generator

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a function generator circuit, and more particularly, to a function generator circuit capable of controlling function generation with a low reference voltage and a low DC input voltage in addition to uniting a DC input terminal. .

1 is a perspective view showing the structure of a general cross-coil indicator. As shown in FIG. 1, a general cross-coil type indicator has two coils (B) and (C) wound on the outer side of a rotor (D), which is usually made of permanent magnets, which are staggered by 90 ° to each other. The central axis of the electron (D) has a structure in which the guide (A) is axially coupled. In the aforementioned cross-coil type indicator, the amount of current flowing through the coils (B) and (C) and the direction of flow of the current are changed, depending on the combined force of the magnetic fields formed by the two coils (B) and (C). The rotor D is rotated to an arbitrary position.

2 is a schematic functional block diagram of a driving apparatus of a conventional cross-coil analog indicator. As shown in FIG. 2, the conventional drive device for a cross-coil type indicator corresponds to the above-described cross coils 7 and 8 and the amount of travel (hereinafter, the speed of the vehicle will be described as an example). A waveform shaper (1) for receiving an input signal in the form of a frequency and shaping the wave into a square wave shape, and an F / V converter (2) for converting the frequency of the square wave shaped and output through the waveform shaper (1) into a proportional DC voltage. A sine function generator (3) and a cosine function generator (4) which form a constant function voltage according to the magnitude of the DC voltage, and output the DC voltage output through the F / V converter (2) as an input. By inputting the function voltage which is the output of the generator 3 and the cosine function generator 4, the current corresponding to the vehicle speed flows into and out of the respective cross coils 7 and 8 to have an indication value corresponding to the vehicle speed. Output rotation to rotate the Comprises a portion (5) and (6). In the drawing, reference numeral 9 denotes a reference voltage generator that generates a reference voltage having a predetermined magnitude.

3 is a detailed circuit diagram of FIG. As shown in FIG. 3, the reference voltage of a predetermined magnitude generated by the reference voltage generator 9 is appropriately divided by the divided resistors R100, R101, R102, and R103, which are connected in series in a predetermined number thereof. This divided voltage is provided as a differential differential input voltage to each of the function generators 3 and 4, which are composed of a plurality of differential amplifier circuits. The other differential input terminal of each of the function generators 3 and 4 has a differential input having a DC voltage (corresponding to the vehicle speed) divided by the resistors R104 and R105 after being generated by the F / V converter 2. Provided by voltage. Next, at the collector terminals of the transistors Q1 and Q2 constituting the differential amplifier circuit of the sine function generator 3, a constant function voltage corresponding to the magnitudes of the differential input signals is converted and displayed. The corresponding voltage is converted into the output circuit section 5 to convert current into and out of the cross coil 7. On the other hand, at the collector terminals of the transistors Q3 and Q4 constituting the differential amplifier circuit of the cosine function generator 4, a constant function voltage corresponding to the magnitudes of the differential input signals is converted and displayed. By converting the voltage corresponding to the output circuit 6 by the current to flow in and out of the cross coil (8). In the figure, reference numeral I denotes a constant current source.

However, in the above-described conventional function generators 3 and 4, the output voltage thereof must be set high by the constant current source I and the transistors Q3, Q4, Q5 and Q13, Q14, Q15. Not only has the problem that the supply voltage (Vcc) should be set high, but also the output voltage of each function generator is directly connected to the supply voltage (Vcc), so that the output voltage of the function generator in accordance with the change of the supply voltage (Vcc) There was this changing issue. Furthermore, as shown in FIG. 2, the DC voltage output from the F / V converter 2 is used as a comparison input of each of the function generators 3 and 4 while being dualized by the resistors R104 and R105. Since the error occurrence rate is high, the reference voltage provided by the reference voltage generator 9 needs to be high.

The present invention has been made to solve the above-described problems, it is possible to set the operating voltage of the supply voltage low, so that the output voltage of the function generator does not occur in accordance with the change of the supply voltage, It is an object of the present invention to provide a function generator circuit capable of unifying and lowering the voltage of a constant voltage generator.

The function generator circuit of the present invention for achieving the above object is a reference voltage generator for generating a predetermined reference voltage: divided by a plurality of voltage divider and the divider resistor divides the voltage generated in the reference voltage generator A sine function generator comprising first to fourth current amplifiers for generating a sine function by comparing a voltage with each reference voltage, wherein the first current amplifier connects the reference voltage comparison terminal to a non-inverting (+) terminal. The second current amplifier connects the reference voltage non-terminal terminal to the inverting (-) terminal to be symmetrical, and the third current amplifier connects the reference voltage comparison terminal to the non-inverting (+) terminal and the fourth The current amplifier is configured to be symmetrical by connecting the reference voltage comparison terminal to the inverting (-) terminal.

Hereinafter, with reference to the accompanying drawings will be described in detail the function generator circuit of the cross-coil type indicator instrument driving apparatus according to a preferred embodiment of the present invention.

4 is a functional block diagram of a function generator of the cross-coil type indicator driving device of the present invention, and FIG. 5 is a detailed circuit diagram of FIG. As shown in Figure 4, a function of the present invention

The generator circuit includes a reference voltage generator 11 for generating a predetermined reference voltage, an F / V converter 12 for receiving an input signal indicating a vehicle speed and converting the signal into a corresponding DC voltage, and the reference voltage generator 11. Multiple series-connected voltage divider resistors RF1, (RF2), (RF3), (RF4), (RF5), (RF6), (RF7), (RF8), and divided voltages that divide the generated voltage by a predetermined ratio. Current amplifiers S1, S2, S3, S4 that generate a sine function by comparing the voltages divided by resistors RF2, RF4, RF6, and RF8 with respective reference voltages. A current amplifier C1 for generating a cosine function by comparing the voltages divided by the sine function generator 20, the divided resistors RF1, RF3, RF5, and RF7 with reference voltages. The constant current source QS2 and QC2 connected to the cosine function generator 20 and the outputs of the sine function generator 20 and the cosine function generator 30 each consisting of (C2), (C3) and (C4). Is done.

In the above-described configuration, an input signal representing the vehicle speed is converted into a DC voltage by the F / V converter 12 to act as an input of each of the sine function generator 20 and the cosine function generator 30, and act as this input. According to the magnitude of the DC voltage, constant current causes the constant current source QS1 of the sine function generator 20 side and the constant current source QS2 of the cosine function generator 30 side to be changed to a constant function value. Then, a function voltage corresponding to the amount of change in the current is generated by each of the resistors RS1 and RC1 to the respective sinusoidal function voltage and the cosine function voltage. In more detail with reference to FIG. 5, the current amplifiers S1 and S2 each having a constant voltage in parallel by the F / V converter 12 which receives a signal input indicating a vehicle speed and converts the signal into a DC voltage. It is applied to the base terminals of transistors Q112, Q124, Q136, and Q148 which are input terminals of (S3) and (S4). On the other hand, the input voltage signal is the base terminal of the transistor Q107 connected to the ground, the base terminal of the transistor Q119 connected to the terminal (b), of the transistor Q131 connected to the terminal (d) Compared with the reference voltage applied to the base terminal of the transistor Q143 connected to the base terminal and the terminal, the current of the constant current source Q153 is adjusted to the inflow size and the resistance ( The voltage generated at RS1) is generated together with the interstitial function. At this time, the magnitude of the current flowing in is the constant current of each of the current amplifiers S1, S2, S3, and S4 configured together with the constant voltage generated by the 1/2 reference voltage generator 14. Cause resistance-transistor pair (R100, Q105, Q106), (R103, Q117, Q118), (R106, Q129, Q130), (R109, Q141, Q142) to be governed by the current magnitude, The change of current by the current is shown in comparison with the respective reference voltage and the DC voltage generated by the F / V converter 12 in the resistor RS1.

On the other hand, the base terminal of the transistor Q302, which is the reference voltage comparison terminal of the current amplifier C1, is connected to the terminal voltage (a; b voltage * 1/2), and the transistor that is the reference voltage comparison terminal of the current amplifier C2 ( The base terminal of Q314) is connected to the terminal voltage (C; ((terminal voltage)-(bterminal voltage) * 1/2), and the base terminal of transistor Q326 which is a reference voltage comparison terminal of current amplifier C3. Is connected to the terminal voltage (ㅁ; {(ㅂ terminal voltage)-(d terminal voltage) * 1/2), and the base terminal of the transistor Q338, which is a reference voltage comparison terminal of the current amplifier C4, Connect to In addition, the constant current sources of each of the current amplifiers C1, C2, C3, and C4 are configured together with the 1/2 reference voltage generator 14, and each of the current amplifiers C1 and C2. The constant current source of), (C3) and (C4) consists of resistor-transistor pairs (R200, Q300, Q301), (R203, Q312, Q313), (R206, Q324, Q325), and (R209, Q336, Q337). Each current flows in a constant manner. In each of the current amplifiers C1, C2, C3, and C4 configured as described above, the DC voltage generated by the F / V converter 12 is compared with the respective reference voltages, The current is adjusted to the amount of inflow, so that the voltage generated in the resistor RC1 is generated with a constant cosine function by the adjusted current.

According to the function generator circuit of the present invention as described above, the magnitude of the supply voltage, which is a conventional problem, can be reduced by using the reference voltage generator, and furthermore, since the change of the reference voltage due to the change of the supply voltage does not appear, the supply voltage In spite of the fluctuation of, stability can be secured.

In addition, the DC voltage used as the output of the F / V converter, that is, the input of the function generator, is unified to ensure the precision of the circuit.The constant voltage terminal and the ground terminal are connected to the ground only by the single element of the constant current source. Even if the voltage between them is lowered below a certain voltage, the function voltage of the function generator is controlled by the constant voltage, so that the conventional problem is improved. In addition, the use range of the supply voltage is wide because the variation of the supply voltage does not affect the function voltage generator. It's losing.

Claims (7)

Reference voltage generator 11 for generating a predetermined reference voltage: a plurality of voltage dividers (RF1), (RF2), (RF3), (RF4), which divides the voltage generated by the reference voltage generator 11, Compare the voltage divided by (RF5), (RF6), (RF7), (RF8) and the voltage divider (RF2), (RF4), (RF6), and (RF8) with the respective reference voltages to obtain a sine function. Sine function generator 20 consisting of current amplifiers (S1), (S2), (S3), and (S4) to generate, wherein the current amplifier (S1) is a reference voltage comparison terminal to the non-inverting (+) terminal And the current amplifier S2 connects the reference voltage non-high terminal to the inverting (-) terminal to be symmetrical, and the current amplifier S3 connects the reference voltage comparison terminal to the non-inverting (+) terminal. The current amplifier (S4) is a function generator circuit for the mutual symmetry by connecting the reference voltage comparison terminal to the inverting (-) terminal. According to claim 1, It is connected to the output terminals of each of the current amplifier (S1), (S2), (S3), (S4) in common, so as to have a change in the current corresponding to the current change amount of the output terminal A function generator circuit further comprising a constant current source QS2. 3. The apparatus of claim 2, further comprising a DC voltage generator 12 for generating a DC voltage corresponding to an input signal, wherein each of the current amplifiers is changed in accordance with a change in the DC voltage output from the DC voltage generator 12. A function generator circuit for controlling the current change of (S1), (S2), (S3), and (S4). 4. The function generator circuit according to claim 3, wherein the constant current source (QS2) sets the current of each of the current amplifiers (S1), (S2), (S3) and (S4) to a constant value. The method of claim 4, wherein the function generation further comprises a half reference voltage generator 14 for generating a voltage of 1/2 of the reference voltage so that the current of the constant current source (QS2) is interlocked with the function generation As an opportunity. 6. The method of claim 5, wherein the output of the reference voltage generator 12 is reversed from the reference voltage comparison terminals of the respective current amplifiers S1, S2, S3, and S4 when the input signal changes. Function generator circuit used as a common input to each input terminal. The current amplifier (C1), the current amplifier (S2), (S3) of any one of claims 1 to 6, wherein the intermediate voltage of the comparison voltages of the current amplifier (S1), (S2) as a reference voltage The current amplifier C2 using the intermediate voltage of the comparison voltages as the reference voltage, the current amplifier C3 using the intermediate voltage of the comparison voltages of the current amplifiers S3 and S4 as the reference voltage, and any DC voltage as the reference voltage. Further comprising a cosine function generator 30 made of a current amplifier (C4), each of the current amplifier (C1), (C2), (C3), (C4) of the cosine function generator 30 is a sine function A function generator circuit configured to be symmetrical with each of the current amplifiers S1, S2, S3, and S4 of the generator 20.