KR100699818B1 - The voltage converter and booster circuit - Google Patents

Abstract

A voltage conversion boost circuit is disclosed. The voltage conversion booster circuit includes a control signal generator, a conversion booster circuit, and a storage output device. The control signal generator generates a plurality of control signals, the conversion booster circuit includes a plurality of voltage pumping circuits, and the reference voltage in response to the plurality of control signals, reference voltages, and supply power supply voltages of the control signal generator. Boost and reverse polarity. The plurality of voltage pumping circuits are connected in series so that charges charged in each voltage pumping circuit are accumulated while being transferred to the voltage pumping circuit at the rear side. The storage output unit charges and outputs the output charge of the conversion booster circuit in response to one control signal of the control signal generator and the supply power supply voltage.

Description

The voltage converter and booster circuit

In order to more fully understand the drawings used in the detailed description of the invention, a brief description of each drawing is provided.

1 illustrates a voltage conversion boost circuit according to an embodiment of the present invention.

2 is a waveform diagram illustrating an operation of the voltage conversion booster circuit shown in FIG. 1.

FIG. 3 shows an internal connection state of the conversion booster circuit in the first section of the waveform diagram shown in FIG. 2.

4 illustrates an internal connection state of the conversion booster circuit in the second section of the waveform diagram shown in FIG. 2.

FIG. 5 shows an internal connection state of the conversion booster circuit in the third section of the waveform diagram shown in FIG. 2.

FIG. 6 shows an internal connection state of the conversion booster circuit in the fourth section of the waveform diagram shown in FIG. 2.

FIG. 7 illustrates an internal connection state of the conversion booster circuit in the fifth section of the waveform diagram shown in FIG. 2.

The present invention relates to a voltage generator, and more particularly to a converted voltage generation and a boost circuit of the generated voltage.

Conventional semiconductor integrated circuits (ICs) operate with a single supply voltage or a dual supply voltage. In general, a single power source refers to a case in which one external power source is supplied to operate semiconductor integrated circuits. For example, only a single +5 volt or +3 volt power supply is provided. In the case of a positive power supply, for example, a +5 volt and a -5 volt power are simultaneously supplied to a semiconductor integrated circuit. 0 volt power is commonly supplied as the reference voltage for both the single power supply and the both power supplies.

In order to drive a MSL (Multi Line Selection) liquid crystal display driver, both a positive power source, positive power and a negative power source are required. For example, negative power is made by using discrete devices externally.

However, the conventional method has a disadvantage in that the cost increases due to the discrete elements for generating negative power, and the pattern of the printed circuit board is not only complicated, but also increases the area of the printed circuit board. .

Accordingly, a technical object of the present invention is to provide a voltage conversion booster circuit for generating a boosted voltage of the opposite polarity required by using a reference voltage of a certain polarity supplied.

According to the present invention for achieving the above technical problem, the voltage conversion boost circuit includes a control signal generator, a conversion boost circuit and a storage output device.

The control signal generator generates a plurality of control signals, the conversion booster circuit converts positive power into a negative power in response to the plurality of control signals, the supply power voltage and the reference voltage, and boosts the power. The output charge of the conversion booster circuit is charged.

The conversion booster circuit includes a plurality of charge pumping circuits, and the plurality of charge pumping circuits are connected in series to each other to pump the charges transferred from the previous charge pumping circuit and the subsequent charge pumping circuit ( pumping) continue to add charge.

The plurality of charge pumping circuits include three switches, that is, first to third switches and capacitors, respectively. The first switch is opened and closed between an input terminal and one end of the capacitor in response to a control signal of the control signal generator, and the second switch is connected at one end to the other end of the capacitor and the other end to a supply power supply voltage. It is connected to open and close in response to one control signal of the control signal generator. The other end of the third switch is connected to one end of the third switch, and the other end of the third switch is connected to the reference voltage to open and close corresponding to one control signal of the control signal generator. One end of the capacitor is connected to the output terminal.

The storage output device includes a switch for switching input charges and a capacitor connected to one end of the switch and the other end connected to a supply power supply voltage to charge the input charge and output a voltage according to the charged amount of charge. do.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. For each figure, like reference numerals denote like elements.

1 illustrates a voltage conversion boost circuit according to an embodiment of the present invention.

Referring to FIG. 1, the voltage conversion booster circuit 1000 includes a control signal generator 100, a conversion booster circuit 200, and a storage output device 300.

The control signal generator 100 outputs a total of seven control signals, that is, the first control signal C1 to the seventh control signal C7.

The conversion booster circuit 200 includes a first charge pumping circuit 210 and a second charge pumping circuit 220.

The first charge pumping circuit 210 includes first switches 211 to third switches 213 and a first capacitor 214. The first switch 211 is opened and closed in response to the first control signal C1 of the control signal generator 100 between the supply power supply voltage Vss and one electrode (−) of the first capacitor 214. One end of the second switch 212 is connected to the other electrode (+) of the first capacitor 214 and the other end is connected to the power supply voltage (Vss) is opened and closed in response to the fourth control signal (C4). The third switch 213 is connected to the other electrode (+) of the first capacitor 214 at one end and the reference voltage Vr at the other end thereof to open and close in response to the fifth control signal C5. When the power supply voltage Vss is applied to one electrode (-) of the first capacitor 214 and the reference voltage Vr is applied to the other electrode +, the charge q = {C1 * (Vr-Vss)} ) Is charged in the first capacitor 214.

The second charge pumping circuit 220 includes a fourth switch 221 to a sixth switch 223 and a second capacitor 224. In the second capacitor 224, the fourth switch 221 is connected to one electrode (−), and the fifth switch 222 and the sixth switch 223 are connected to the other electrode (+). The fourth switch 221 is opened and closed in response to the second control signal C2 of the control signal generator 100 between the supply power supply voltage Vss and the one electrode of the second capacitor 224. The fifth switch 222 is opened and closed in response to the sixth control signal C6 between the reference voltage Vr and the other electrode (+) of the second capacitor 224. The sixth switch 223 is opened and closed in response to the seventh control signal C7 of the control signal generator between the other electrode (+) of the second capacitor 224 and the reference voltage Vr. When the reference voltage Vr is applied to the second capacitor 224, the positive charge q = C 2 * {Vr− (Vss−Vr)} is charged in the second capacitor 224.

The storage output unit 300 includes a seventh switch 301 and a third capacitor 302. The seventh switch 301 switches the charges charged in the second capacitor 224 to the third capacitor 302, and the third capacitor 302 has one electrode (−) connected to the seventh switch 301. The other electrode (+) is connected to the supply power supply voltage Vss.

2 is a waveform diagram illustrating an operation of the voltage conversion booster circuit 1000 illustrated in FIG. 1.

Referring to FIG. 2, the signals C1 to C7 are output signals of the control signal generator, the electrode CAP1 + represents one electrode of the first capacitor, and the electrode CAP1- represents the first capacitor. Another electrode (-) is shown, electrode CAP2 + represents one electrode (+) of the second capacitor, and electrode CAP2- represents the other electrode (-) of the second capacitor. Reference voltage Vr Denotes an arbitrary voltage to be boosted and polarized, and the output voltage Vo is a negative voltage stored and output in the third capacitor.

It is assumed that all three capacitors C1, C2, and C3 shown in FIG. 1 are in a discharged state (assuming Vss is a ground potential), and FIG. 2 shows operating characteristics of the voltage booster circuit 1000 according to the present invention. It will be described according to the section of the control signals (C1 to C7) shown in.

3 illustrates an internal connection state of the voltage conversion booster circuit 1000 in the first section of the waveform diagram of FIG. 2.

3, in the first section P1, since the control signals C1, C5, C6, and C3 are in a logic high state, the switches 211, 213, 222, and 301 are turned on. Since the control signals C2, C4, and C7 are in a logic low state, the remaining switches 221, 212, and 223 are turned off. Accordingly, the charge q = {C1 * (Vr-Vss)}, which is proportional to the difference between the arbitrary reference voltage Vr and the supply power supply voltage Vss, is charged in the first capacitor C1, so that the electrode CAP1 + The voltage value is equal to an arbitrary reference voltage Vr, and the voltage values of the electrodes CAP1-, CAP2 + and CAP2- and the output voltage Vo are equal to the external supply voltage Vss.

4 illustrates an internal connection state of the voltage conversion booster circuit 1000 in the second section of the waveform diagram of FIG. 2.

Referring to FIG. 4, in the second section P2, since the control signals C1, C5, C6, and C3 are in a logic low state, the switches 211, 213, 222, and 301 are turned off, and the control signals are controlled. Since C2, C4, and C7 are in a logic low state, the remaining switches 221, 212, and 223 are turned off. The voltage of the electrode CAP1 + is equal to the external supply power supply Vss, and the voltage value of the electrode CAP1- is equal to the voltage Vr generated by the charge charged during the first period. The reference voltage Vr is applied to the electrode CAP2 +, and the voltage of the electrode CAP2- becomes the inverted voltage value (-Vr) of the reference voltage Vr. The reference voltage Vr is applied to the positive electrode CAP2 + of the second capacitor CAP2. Since the negative electrode CAP2- of the second capacitor CAP2 has the voltage value -Vr, the second capacitor CAP CAP2 is charged with a charge q = C2 * {Vr- (Vss-Vr)}. In other words, the charge q = C2 * 2Vr is charged. The capacitor C3 has no voltage transferred yet, and therefore has a voltage value Vss.

FIG. 5 illustrates an internal connection state of the voltage conversion booster circuit 1000 in the third section of the waveform diagram of FIG. 2.

Referring to FIG. 5, in the third section P3, since the control signals C1, C5, C6, and C3 are in a logic high state, the switches 211, 213, 222, and 301 are turned on. Since the control signals C2, C4, and C7 are in a logic low state, the remaining switches 221, 212, and 223 are turned off. Therefore, the charge q = {C1 * (Vr-Vss)}, which is proportional to the difference between the reference voltage Vr and the supply power supply voltage Vss, is charged in the first capacitor C1, so that the voltage value of the electrode CAP1 + is increased. This voltage is equal to the reference voltage Vr, and the voltages of the electrodes CAP1- and CAP2 + are equal to the power supply Vss. The voltage (-2Vr) due to the charge q = C2 * {Vr- (Vss-Vr)} charged in the second capacitor C2 is displayed on the electrode CAP2- and the output terminal Vo.

6 illustrates an internal connection state of the voltage conversion booster circuit 1000 in the fourth section of the waveform diagram of FIG. 2.

Referring to FIG. 6, in the fourth section P4, since the control signals C1, C5, C6, and C3 are in a logic low state, the switches 211, 213, 222, and 301 are turned off, and the control signals Since C2, C4, and C7 are in a logic low state, the remaining switches 221, 212, and 223 are turned off. The voltage of the electrode CAP1 + is equal to the external supply voltage Vss, and the voltage of the electrode CAP1- is equal to the voltage Vr generated by the charge charged during the first period. The reference voltage Vr is applied to the electrode CAP2 +, and the voltage of the electrode CAP2- has a voltage value (−Vr). The reference voltage Vr is applied to one electrode CAP2 + of the second capacitor CAP2. The voltage of the other electrode CAP2- of the second capacitor CAP2 has a voltage value (-Vr), so the second capacitor Charge (q = CAP2 * {Vr- (Vss-Vr)}) is charged in CAP2. That is, the charge q = CAP2 * 2Vr-Vss is charged.

FIG. 7 illustrates an internal connection state of the voltage conversion booster circuit 1000 in the fifth section of the waveform diagram of FIG. 2.

Referring to FIG. 7, in the fifth section P5, since the control signals C1, C5, C6, and C3 are in a logic high state, the switches 211, 213, 222, and 301 are turned on. Since the control signals C2, C4, and C7 are in a logic low state, the remaining switches 221, 212, and 223 are turned off. Therefore, the charge q = {CAP1 * (Vr-Vss)} proportional to the difference between the arbitrary reference voltage Vr and the supply power supply voltage Vss is charged in the first capacitor C1, so that the electrode CAP1 + The voltage value is equal to the reference voltage Vr, and the voltages of the electrodes CAP1- and CAP2 + are equal to the supply power supply voltage Vss. When the charge q = C2 * {Vr- (Vss-Vr)} charged in the second capacitor C2 is distributed to the third capacitor 302 of the output reservoir 300 while the switch 221 is turned on. In addition, the polarity of the reference voltage Vr is reversed and the voltage boosted twice (-2Vr) appears on the electrode CAP2- and the output terminal Vo. Since the third capacitor 302 had previously charged charges, the charges are recharged as much as those charges are discharged due to leakage or the like, so that the output voltage Vo after the third step always has a voltage value (-2Vr). Have

As shown in FIG. 1, when the circuit is composed of two charge pumping circuits and one reference voltage, the output voltage Vo can obtain a negative voltage (-2Vr) that is twice as large as the reference voltage Vr. have.

In the above case, the positive reference voltage Vr has been described. However, when the reference voltage is negative, the output voltage becomes positive voltage. Obviously it can be created.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

As described above, the voltage converting booster circuit according to the present invention has a polarity opposite to the reference voltage and can generate a voltage in the semiconductor circuit as much as a multiple of the reference voltage, so that a plurality of discrete devices and the same are mounted. There is an advantage that no additional use area of the printed circuit board is required.

Claims (4)

A control signal generator for generating a plurality of control signals; A conversion boost circuit for boosting a reference voltage and converting polarity in response to the plurality of control signals, the reference voltage, and the supply power voltage of the control signal generator; And And a storage output unit configured to charge an output charge of the conversion booster circuit in response to one control signal of the control signal generator and the supply power supply voltage. The method of claim 1, wherein the conversion boost circuit, A plurality of voltage pumping circuits, And the plurality of voltage pumping circuits are connected in series so that charges charged in each voltage pumping circuit are transferred to and accumulated in the voltage pumping circuit at the rear side. The method of claim 2, wherein the first voltage pumping circuit among the plurality of voltage pumping circuits connected in series comprises: A first capacitor; A first switch for switching between a supply power supply voltage and one electrode of the capacitor which is an output terminal in response to one control signal of the control signal generator; A second switch for switching between the other electrode of the capacitor and the supply power supply voltage in response to another control signal of the control signal generator; And A third switch for switching between the other electrode of the capacitor and the reference voltage in response to another control signal of the control signal generator, The remaining voltage pumping circuits, A second capacitor; A fourth switch for switching between one electrode of the second capacitor, which is an output terminal, and an output terminal of the front voltage pumping circuits in response to one control signal of the control signal generator; A fifth switch configured to switch between the other electrode of the capacitor and the power supply voltage in response to another control signal of the control signal generator; And And a sixth switch configured to switch between another electrode of the capacitor and the reference voltage in response to another control signal of the control signal generator. The method of claim 1, wherein the storage output unit, A capacitor having one electrode connected to the supply power supply voltage; And And a switch for switching one electrode of the capacitor, which is an input terminal and an output terminal, in response to one control signal of the control signal generator.

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