CN107046364A

CN107046364A - Charge pump

Info

Publication number: CN107046364A
Application number: CN201610082233.XA
Authority: CN
Inventors: 庄智翔; 吴子忠
Original assignee: ILITEK TECHNOLOGY Co Ltd
Current assignee: ILITEK TECHNOLOGY Co Ltd; ILI Techonology Corp
Priority date: 2016-02-05
Filing date: 2016-02-05
Publication date: 2017-08-15

Abstract

A kind of charge pump includes a gang of Pu voltage generator, and J single-direction conductor, the side Pu voltage generator is controlled and produces a gang of Pu voltage, the J single-direction conductor has a first end and one second end respectively, second end of each single-direction conductor electrically connects the side Pu voltage generator to receive the side Pu voltage, and each single-direction conductor is according to secondly whether the cross-pressure at end is more than a lock value, to determine to be on and be not turned on alternative one, when any one conducting in the J single-direction conductor, produce an output voltage for being positively correlated with the side Pu voltage, and exported from its first end, and the J output voltage that the J single-direction conductor produce respectively non-interference each other is made by the side Pu voltage generator, J >=1, J is positive integer.

Description

Charge pump

【Technical field】

Pu, more particularly to a kind of charge pump are helped the present invention relates to one kind.

【Background technology】

Existing charge pump mainly uses electric capacity to store energy of a charge, and is cut using control Change switch so that electric charge can be constantly from upper level accumulation to next stage, so as to reach rise The effect of pressure, and be widely used in driving chip, still, due to existing electric charge Side only has one group of output in Pu, if therefore if the voltage load different to two groups to be provided simultaneously, Then easily because wherein one category heavy duty of two groups of loads is to charge pump extraction high current A stable voltage can not be exported and have and greatly disturb by causing the output voltage of the charge pump It is dynamic, so that influence the charge pump can not provide stable voltage belongs to being somebody's turn to do for underloading for another group Load is used.

If by the way that two groups of voltage-stablizers (Regulator) are electrically connected in two load and the electricity Between lotus side Pu, with the disturbance for the output voltage for improving the charge pump, but its shortcoming is to be somebody's turn to do Two voltage-stablizers can reduce the output voltage of the charge pump, cause the output of the charge pump Undertension, so that two load can not be driven.

Therefore, extend another solution, as produced respectively using two groups of charge pumps One group of output voltage, another group is influenceed to avoid the one of which output voltage from producing disturbance The problem of output voltage, and there is two groups of output voltages enough voltage to drive two difference Load, but, its shortcoming is following 2 points：

1. increase cost：Since it is desired that two groups of charge pumps, it is therefore desirable to two times of electric charge side The element at Pu, and if two groups of charge pumps need to be arranged on a chip, must also increase Plus the area of the chip.

2. power consumption：Since it is desired that two groups of charge pump electric energy of supply, therefore power consumption also can be again Number growth.

【The content of the invention】

Therefore, the purpose of the present invention, i.e., can provide multigroup difference mutually not dry in offer one kind Disturb and be enough to drive the regulated output voltage of the load with different load-carryings, and cost can be reduced With the charge pump for reducing consumption stream.

Then, charge pump of the present invention is individual unidirectional comprising a side Pu voltage generator, and J Conductor, J >=1, J is positive integer.

The side Pu voltage generator is controlled to switch on one first level and one second to produce one Side Pu voltage between level.

The J single-direction conductor has a first end respectively, and one electrically connects the side Pu voltage Generator is to receive the second end of the side Pu voltage, and according to secondly whether the cross-pressure at end is more than One lock value, it is when closed, each unidirectional to determine to be on and be not turned on alternative one Conductor produces an output voltage for being positively correlated with the side Pu voltage, and is exported from its first end.

It is preferred that the side Pu voltage generator includes an electric capacity, a first switch, one second Switch, and one the 3rd switch, the electric capacity have a first end for exporting the side Pu voltage, and One second end；The first switch has a first end for receiving one first bias, and one is electrically connected Connect the second end of the first end of the electric capacity, and it is controlled and switch on conducting and be not turned on the two One of；The second switch has the first end at second end for electrically connecting the electric capacity, and one connects Receive one second bias the second end, and it is controlled and switch on conducting be not turned on alternative one； 3rd switch receives one the 3rd first end biased with one, and one is electrically connected to the electric capacity The second end first end, and it is controlled and switch on conducting be not turned on alternative one；And When the side Pu voltage generator operates in a first mode, the first switch and this second open Close controlled and turn on, when the side Pu voltage generator operates in a second mode, this Three switches are controlled and turn on.

It is preferred that the charge pump is also comprising J output capacitance, each output capacitance has The first end of one ground connection, and one second end, the second end of the J output capacitance is electrically connected respectively The first end of corresponding person of the J single-direction conductor is connect to receive the output voltage, J >=1, J is positive integer.

It is preferred that the charge pump is also comprising I detection unit and I the 4th switch, the I Individual detection unit has second end for electrically connecting one of the J output capacitance respectively The of a reference voltage is received with the first input end of the output voltage corresponding to reception, one Two inputs, and an output end, and according to the corresponding output voltage and the reference voltage, A comparison signal is exported in its output end, 0≤I≤J, I is positive integer；The I the 4th is opened Close be electrically connected in the corresponding detection unit the first input end and it is corresponding should The first end of single-direction conductor, and controlled by the comparison signal and switch on and turn on and be not turned on Alternative one.

It is preferred that each detection unit includes the resistance and a comparator of two series connection, should The resistance of two series connection is electrically connected to first input end and ground of the corresponding detection unit Between, and produce a branch pressure voltage in common hold of two resistance；The comparator has an electricity The common end of two resistance is connected to receive first end, the electrical connection of the branch pressure voltage Second input of the corresponding detection unit to receive the second end of the reference voltage, And one the corresponding detection unit of electrical connection the output end to export the defeated of the comparison signal Go out end.

It is preferred that the charge pump is also comprising I detection unit and I the 4th switch, the I Individual detection unit has one to electrically connect the first of one of the J single-direction conductor respectively Hold to receive the first input end of the corresponding output voltage, one receive a reference voltage Second input, and an output end, and according to the corresponding output voltage and the reference electricity Pressure, exports a comparison signal, 0≤I≤J, I is positive integer in its output end；The I the Four switches are electrically connected in the second end of the corresponding single-direction conductor and the side Pu voltage To receive the side Pu voltage between generator, and by the comparison signal control and switch on conducting and It is not turned on alternative one.

It is preferred that each detection unit includes two series resistances and a comparator, this two Individual series resistance is electrically connected between the first input end of the corresponding detection unit and ground, And one in two resistance holds one branch pressure voltage of generation jointly；The comparator has an electrical connection The common end of two resistance with receive the branch pressure voltage first end, one electrical connection institute it is right Second input for the detection unit answered is to receive the second end of the reference voltage, and one The output end of the corresponding detection unit is electrically connected to export the output of the comparison signal End.

It is preferred that the side Pu voltage generator also includes an electric capacity, a first switch, one the Two switches and one the 3rd switch, the electric capacity have a first end, and one exports the side Pu voltage The second end；The first switch has a first end for receiving first bias, and one is electrically connected Connect the second end of the first end of the electric capacity, and it is controlled and switch on conducting and be not turned on the two One of；The second switch has the first end at second end for electrically connecting the electric capacity, and one connects Receive this second bias the second end, and it is controlled and switch on conducting be not turned on alternative one； First end of 3rd switch with a first end for electrically connecting the electric capacity, and one receive this Three bias the second ends, and it is controlled and switch on conducting be not turned on alternative one；And work as When the side Pu voltage generator operates in a first mode, the first switch and the second switch It is controlled and turn on, when the side Pu voltage generator operates in a second mode, the 3rd Switch is controlled and turns on.

It is preferred that the charge pump is also comprising I detection unit and I the 4th switch, the I Individual detection unit has second end for electrically connecting one of the J output capacitance respectively The of a reference voltage is received with the first input end of the output voltage corresponding to reception, one Two inputs, and an output end, and according to the corresponding output voltage and the reference voltage, A comparison signal is exported in its output end, 0≤I≤J, I is positive integer；The I the 4th is opened Close the first input end and the corresponding list being electrically connected in the corresponding detection unit To the first end of conductor, and controlled by the comparison signal and switch on and turn on and be not turned on two One of person.

It is preferred that each detection unit includes the resistance and a comparator of two series connection, should The resistance of two series connection is electrically connected to first input end and ground of the corresponding detection unit Between, and produce a branch pressure voltage in common hold of two resistance；The comparator has an electricity Second input of the corresponding detection unit is connected to receive the first of the reference voltage End, one electrically connect two resistance the common end to receive the second end of the branch pressure voltage, And one the corresponding detection unit of electrical connection the output end to export the defeated of the comparison signal Go out end.

It is preferred that each detection unit includes the resistance and a comparator of two series connection, should The resistance of two series connection is electrically connected to first input end and ground of the corresponding detection unit Between, and produce a branch pressure voltage in common hold of two resistance；The comparator has one to connect Receive two electricity of the corresponding detection unit of the first end of the reference voltage, an electrical connection The common end of resistance to receive the second end of the branch pressure voltage, and an electrical connection it is corresponding should The output end of detection unit is to export the output end of the comparison signal.

It is preferred that each single-direction conductor includes at least one diode, the diode The first end of the corresponding single-direction conductor of negative electrode electrical connection, the anode of the diode is electrically connected Connect the second end of the corresponding single-direction conductor.

It is preferred that each single-direction conductor includes at least one diode, the diode The first end of the corresponding single-direction conductor of anode electrical connection, the negative electrode of the diode is electrically connected Connect the second end of the corresponding single-direction conductor.

It is preferred that the J single-direction conductor may be selected from diode, Schottky diode respectively In one kind or its combination.

【Brief description of the drawings】

The other features and effect of the present invention, will be clear in embodiment referring to the drawings Ground is presented, wherein：

Fig. 1 is a first embodiment of charge pump of the present invention；

Fig. 2 is a first mode and one the 3rd for the first embodiment of charge pump of the present invention Pattern；

Fig. 3 is a second mode of the first embodiment of charge pump of the present invention；

Fig. 4 is the load of first embodiment electrical connection one first and one of charge pump of the present invention Second load；

Fig. 5 is a second embodiment of charge pump of the present invention；

Fig. 6 is a 3rd embodiment of charge pump of the present invention；

Fig. 7 is a fourth embodiment of charge pump of the present invention；

Fig. 8 is a first mode and one the 3rd for the fourth embodiment of charge pump of the present invention Pattern；

Fig. 9 is a second mode of the fourth embodiment of charge pump of the present invention；

Figure 10 is one the 5th embodiment of charge pump of the present invention；

Figure 11 is a sixth embodiment of charge pump of the present invention；

Figure 12 is the version of the first embodiment of charge pump of the present invention；And

Figure 13 is the version of the fourth embodiment of charge pump of the present invention.

【Embodiment】

Before the present invention is described in detail, it shall be noted that in the following description content, class As element be to be represented with being identically numbered.

Refering to Fig. 1, a first embodiment of charge pump of the present invention includes a side Pu electricity Generator 1, J output capacitance Co, and J single-direction conductor 2 are pressed, J >=1, J is just whole Number.

The side Pu voltage generator 1 receive first to the 3rd bias V1~V3, and it is controlled with Produce a side Pu voltage Va switched between one first level and one second level, the side Pu Voltage generator 1 includes an electric capacity C, a first switch S1, a second switch S2, and one 3rd switch S3.And the equivalent V1 of first level, and the equivalent V3+ (V1 of second level - V2), it is described further below.

Electric capacity C has the first end of an output side Pu voltage Va, and one second end.

First switch S1 has a first end for receiving first bias V1, and one is electrically connected Connect the second end of electric capacity C first end, and it is controlled and switch on conducting with being not turned on Alternative one.

Second switch S2 has the first end at second end for electrically connecting electric capacity C, and One receive this second bias V2 the second end, and it is controlled and switch on conducting with being not turned on Alternative one.

3rd switch S3 has one to receive the 3rd first end for biasing V3, and one is electrically connected It is connected to the first end at electric capacity C the second end, and it is controlled and switch on conducting with not leading Logical alternative one.

The J output capacitance Co has the first end of a ground connection, and one second end respectively.

The J single-direction conductor 2 has a first end and one second end respectively, each unidirectional The second end of output capacitance Co corresponding to the first end electrical connection of conductor 2, and should Second end electrically connects the side Pu voltage generator 1 to receive the side Pu voltage Va, Mei Yidan To conductor 2 according to secondly whether the cross-pressure at end is led more than a lock value Vf with determining to be in Lead to and be not turned on alternative one, when any conducting of the J single-direction conductor 2, that is, produce Raw one is positively correlated with side Pu voltage Va output voltage Vo, and is exported from its first end.

Wherein, each single-direction conductor 2 includes at least one diode, the moon of the diode Pole electrically connects the first end of the single-direction conductor 2, and the anode of the diode electrically connects the list To the second end of conductor 2, and lock value Vf is a conducting voltage of the diode, but not As limit, the J single-direction conductor 2 can also be respectively selected from diode, the pole of Schottky two Pipe, and any combinations.

For the operation of the first embodiment of clear explanation charge pump of the present invention, this implementation Example is illustrated with two single-direction conductors 2 and two output capacitance Co, and definition should First bias V1 is equal to the 3rd bias V3 (i.e. V1=V3), and the second bias V2 is ground connection, And each single-direction conductor 2 has a lock value Vf, and with a first mode to one the 3rd mould Formula is described in detail.

First mode：

Refering to Fig. 2, first switch S1 and the controlled conductings of second switch S2, and this S3 is controlled is not turned on for three switches, then the side Pu voltage generator 1 produces a charging current I Electric capacity C is entered through first switch S1 and second switch S2 by the first bias V1 Row charging, now the side Pu voltage Va of the side Pu voltage generator 1, which is in, is equal to this First bias V1 first level (i.e. Va=V1) so that each single-direction conductor 2 is led Lead to and produce output voltage Vo, and the output voltage Vo of each single-direction conductor 2 Corresponding output capacitance Co is charged simultaneously, up to electric capacity C bis- ends across Vc is pressed to be equal to the first bias V1 (i.e. Vc=V1-0), into second mode, each list Shown in the output voltage Vo equation below 1 of conductor 2.

Vo=Va-Vf=V1-Vf (formula 1)

Second mode：

Refering to Fig. 3, the 3rd switch controlled conductings of S3, and first switch S1 with this S2 is controlled is not turned on for two switches, then the side Pu voltage Va of the side Pu voltage generator 1 Second level in the cross-pressure Vc for being equal to the 3rd bias V3 plus the ends of electric capacity C bis- (i.e. Va=V3+Vc=V3+ (V1-V2)=V1+V1=2V1) so that each single-direction conductor 2 Turn on and produce output voltage Vo, and the output voltage of each single-direction conductor 2 Vo charges to corresponding output capacitance Co simultaneously, until each output capacitance Co cross-pressure is equal to the output voltage Vo of the corresponding single-direction conductor 2, into the Three patterns, shown in output voltage Vo equation below 2.

Vo=Va-Vf=2V1-Vf (formula 2)

3rd pattern：

Refering to Fig. 2, first switch S1 and the controlled conductings of second switch S2, and this S3 is controlled is not turned on for three switches, then the side Pu voltage generator 1 produces charging current I Electric capacity C is carried out through first switch S1 and second switch S2 by the first bias V1 Charging, thus the side Pu voltage Va of the side Pu voltage generator 1 be in be equal to this One bias V1 first level (i.e. Va=V1) so that each single-direction conductor 2 is neither Conducting, therefore each output voltage Vo then passes through corresponding output capacitance Co electric discharges And output voltage Vo is maintained at 2V1-Vf, return to second mode restart it is new A cycle.

In addition, refering to Fig. 4, two single-direction conductors 2 are defined herein respectively with one first Single-direction conductor 21 and 1 second single-direction conductor 22 is illustrated, and this first unidirectional is passed The device 21 and output voltage Vo produced by second single-direction conductor 22 is led respectively with first Output voltage Vo1 and the second output voltage Vo2 is to represent, and the electric charge is helped by the present embodiment The load 31 of Pu electrical connection one first and one second load 32, because first load 31 belongs to Heavy duty, so the current value that first load 31 needs reception larger could be driven, leads First output voltage Vo1 for causing first single-direction conductor 21 to produce can produce larger Disturbance；And because second load 32 belongs to underloading, therefore only need to receive stable be somebody's turn to do Second output voltage Vo2 can be driven, and make first single-direction conductor 21 and this The first output voltage Vo1 and the second output electricity that two single-direction conductors 22 are produced respectively Pressure Vo2 can maintain a stationary value and interference-free each other.

Refering to Fig. 5, a second embodiment of charge pump of the present invention is similar to first implementation Example, difference is in the charge pump also comprising I detection unit 4, and I the 4th switch S4,0≤I≤J, I are positive integer.

The I detection unit 4 has one to electrically connect the J output capacitance Co wherein respectively One of the second end with receive corresponding output voltage Vo1 first input end, one The second input of a reference voltage, and an output end are received, and should according to corresponding Output voltage Vo1 and reference voltage Vr, a comparison signal S is exported in its output end.

Each detection unit 4 includes the resistance R and a comparator 41 of two series connection.This two The resistance R of individual series connection is electrically connected to the first input end of the corresponding detection unit 4 The output voltage is relevant between ground, and in a common end generation one of two resistance R Vo1 branch pressure voltage Vb.The comparator 41 have one electrically connect two resistance R this be total to With end to receive the detection list that branch pressure voltage Vb first end, an electrical connection are corresponding Second input of member 4 is to receive reference voltage Vr the second end, and an electrical connection institute The output end of the corresponding detection unit 4 is to export comparison signal S output end.

The switches of the I the 4th S4 be electrically connected in the corresponding detection unit 4 this The first end of one input and the corresponding single-direction conductor 21, and by comparison signal S Control and switch on conducting and be not turned on alternative one.

For convenience of further clear explanation, in the present embodiment with a detection unit 4 Exemplified by one the 4th switch (i.e. I=1), but it is not limited, can also there are two, three, Or more, it can change according to actual demand.

And define the first end and the second end difference of the comparator 41 of the detection unit 4 For non-inverting input and reverse input end, and electrically connected wherein with the 4th switch S4 One of one-way conduction device be the first one-way conduction device 21, the of the first one-way conduction device 21 The output voltage of one end output is the first output voltage Vo1；On the contrary, it is another not with The one-way conduction device of 4th switch S4 electrical connections is the second one-way conduction device 22, and this second The output voltage of the first end output of one-way conduction device 22 is the second output voltage Vo2, This embodiment the 4th switch S4 with p-type metal-oxide-semifield-effect electric crystal (MOS, Metal-Oxide-Semiconductor exemplified by) with facilitate explanation its action, but not as Limit.

The manner of execution of the charge pump of the present embodiment is with the first embodiment, herein no longer Repeat, therefore, switch the action between S4 directly against the detection unit 4 and the 4th and be subject to Explanation：When branch pressure voltage Vb is more than reference voltage Vr, the output of the comparator 41 The comparison signal S of end output is in a high level, so that the 4th switch S4 is switched to It is not turned on, with strangulation first output voltage Vo1；On the contrary, as branch pressure voltage Vb During less than reference voltage Vr, the comparison signal S of the output end output of the comparator 41 In a low level, so that the 4th switch S4 switches to conducting.

That is, the present embodiment passes through the comparison signal S produced by the comparator 41 To control the 4th switch S4 conducting with being not turned on, the strangulation first unidirectional biography is come with this Lead the first output electricity that the second end of the output capacitance Co corresponding to device 21 is exported Vo1 is pressed, and makes second of the output capacitance Co corresponding to first single-direction conductor 21 First output voltage Vo1 that is exported is held to be different from the of second single-direction conductor 22 Second output voltage Vo2 that one end is exported.

Refering to Fig. 6, a 3rd embodiment of charge pump of the present invention is similar to second implementation Example, its difference is in the connection pass in the 4th switch S4 and two single-direction conductors 2 System.

4th switch S4 is electrically connected to the of one of two single-direction conductors 2 To receive side Pu voltage Va between two ends and the side Pu voltage generator 1, and compared letter by this Number S control and switch on conducting and be not turned on alternative one.The action of the 3rd embodiment is former Reason will not be repeated here with described in the second embodiment.

Refering to Fig. 7, a fourth embodiment of charge pump of the present invention is similar to first implementation Example, difference is in included by the J single-direction conductor 2 and the side Pu voltage generator 1 Company between electric capacity C, first switch S1, the switches of second switch S2 and the 3rd S3 Connect relation.

Each single-direction conductor 2 includes at least one diode, the anode electricity of the diode The first end of the corresponding single-direction conductor of connection, the negative electrode electrical connection institute of the diode Second end of the corresponding single-direction conductor.

Electric capacity C has the first end, and exports side Pu voltage Va second end.

First switch S1 has the first end for receiving first bias V1, and electrical connection Second end of electric capacity C first end, and it is controlled and switch on conducting with being not turned on Alternative one.

Second switch S2 has the first end at the second end for electrically connecting electric capacity C, and Receive this second bias V2 second end, and it is controlled and switch on conducting with being not turned on Alternative one.

3rd switch S3 has the first end for the first end for electrically connecting electric capacity C, and Receive the 3rd bias V3 second end, and it is controlled and switch on conducting with being not turned on Alternative one.

Because above-mentioned electric capacity C, first switch S1, second switch S2 and the 3rd Annexation between switch S3 causes the equivalent V2 of first level of the present embodiment, and this The equivalent V3- (V1-V2) of two levels.

For the operation of the fourth embodiment of clear explanation charge pump of the present invention, this implementation Example is illustrated with two single-direction conductors 2 and two output capacitance Co (i.e. J=2), and Define first bias V1 is reversed the 3rd bias V3 (i.e. V3=-V1), and this second It is ground connection to bias V2, and each single-direction conductor 2 has lock value Vf, and with one the One pattern to one the 3rd pattern is described in detail.

First mode：

Refering to Fig. 8, first switch S1 and the controlled conductings of second switch S2, and this S3 is controlled is not turned on for three switches, then the side Pu voltage generator 1 produces a charging current I Electric capacity C is entered through first switch S1 and second switch S2 by the first bias V1 Row charging, now the side Pu voltage Va of the side Pu voltage generator 1, which is in, is equal to this Second bias V2 first level (i.e. Va=V2=0) so that each single-direction conductor 2 It is not turned on so that the charge pump does not export output voltage Vo (i.e. Vo=0), into second Pattern.

Second mode：

Refering to Fig. 9, the 3rd switch controlled conductings of S3, and first switch S1 with this S2 is controlled is not turned on for two switches, then the side Pu voltage Va of the side Pu voltage generator 1 Second level in the cross-pressure Vc for being equal to the 3rd bias V3 plus the ends of electric capacity C bis- (i.e. Va=V3- (V1-V2)=V3-Vc=-V1-V1=-2V1) so that each list Turned on to conductor 2 and produce output voltage Vo, carry out each output capacitance Co Charging, until the cross-pressure of each output capacitance Co is equal to the corresponding single-direction conductor 2 output voltage Vo, into the 3rd pattern, shown in output voltage Vo equation below 4.

Vo=Va+Vf=-2V1+Vf (formula 4)

3rd pattern：

Refering to Fig. 8, first switch S1 and the controlled conductings of second switch S2, and this S3 is controlled is not turned on for three switches, then the side Pu voltage generator 1 produces charging current I Electric capacity C is carried out through first switch S1 and second switch S2 by the first bias V1 Charging, thus the side Pu voltage Va of the side Pu voltage generator 1 be in be equal to this First level (i.e. Va=V2=0) of two biass so that each single-direction conductor 2 is neither Conducting, therefore each output voltage Vo then passes through corresponding output capacitance Co electric discharges And output voltage Vo is maintained at -2V1+Vf, return to second mode restart it is new A cycle.

Refering to Figure 10, one the 5th embodiment of charge pump of the present invention is similar to the 4th in fact Apply example, difference is in also includes the I detection unit 4 in the charge pump, and the I individual the Four switch S4,0≤I≤J, I is positive integer.

The I detection unit 4 respectively have electrically connect the J output capacitance Co wherein it One the second end is to receive the corresponding output voltage Vo2 first input end, connect Reference voltage Vr second input, and the output end are received, and according to corresponding Output voltage Vo2 and reference voltage Vr, comparison signal S is exported in its output end.

Each detection unit 4 includes the resistance R of this two series connection, and the comparator 41, should The resistance R of two series connection is electrically connected to first input of the corresponding detection unit 4 Between end and ground, and branch pressure voltage Vb is produced in the common end of two resistance R.Should There is comparator 41 second input of the detection unit 4 corresponding to electrical connection to connect Receive reference voltage Vr first end, one electrically connect two resistance R the common end with Receive branch pressure voltage Vb the second end, and the corresponding detection unit 4 of an electrical connection The output end to export comparison signal S output end.

The switches of the I the 4th S4 be electrically connected in the corresponding detection unit 4 this The first end of one input and the corresponding single-direction conductor 22, and by comparison signal S Control and switch on conducting and be not turned on alternative one.

And define the first end and the second end difference of the comparator 41 of the detection unit 4 For non-inverting input and reverse input end, and electrically connected wherein with the 4th switch S4 One of one-way conduction device be the second one-way conduction device 22, the of the second one-way conduction device 22 The output voltage of one end output is the second output voltage Vo2；On the contrary, it is another not with The one-way conduction device of 4th switch S4 electrical connections is the first one-way conduction device 21, and this first The output voltage of the first end output of one-way conduction device 21 is the first output voltage Vo1, This embodiment the 4th switch S4 with N-type metal-oxide-semifield-effect electric crystal (MOS, Metal-Oxide-Semiconductor exemplified by) with facilitate explanation its action, but not as Limit.

The manner of execution of the charge pump of the present embodiment is with the fourth embodiment, herein no longer Repeat, therefore, switch the start between S4 directly against the detection unit 4 and the 4th and be subject to Explanation：When the branch pressure voltage Vb related to second output voltage Vo2 is less than this with reference to electricity When pressing Vr, the comparison signal S of the output end output of the comparator 41 is in the low level, So that the 4th switch S4 is switched to and is not turned on, with strangulation second output voltage Vo2； On the contrary, when the branch pressure voltage Vb related to second output voltage Vo2 is more than the reference During voltage Vr, the comparison signal S of the output end output of the comparator 41 is in the high level , so that the 4th switch S4 switches to conducting.

That is, the present embodiment passes through the comparison signal S produced by the comparator 41 To control the 4th switch S4 conducting with being not turned on, the strangulation second unidirectional biography is come with this Lead the second output electricity that the second end of the output capacitance Co corresponding to device 22 is exported Vo2 is pressed, and makes second of the output capacitance Co corresponding to second single-direction conductor 22 Second output voltage Vo2 that is exported is held to be different from the of first single-direction conductor 21 First output voltage Vo1 that one end is exported.

Refering to Figure 11, a sixth embodiment of charge pump of the present invention is similar to the 5th in fact Example is applied, its difference is in the connection pass in the 4th switch S4 and two single-direction conductors 2 System.

4th switch S4 is electrically connected to the second of one of two single-direction conductors To receive side Pu voltage Va between end and the side Pu voltage generator 1, and by the comparison signal S is controlled and is switched on conducting and be not turned on alternative one.The operating principle of the sixth embodiment With described in the 5th embodiment, it will not be repeated here.

Refering to Figure 12 and Figure 13 be respectively charge pump of the present invention the first embodiment and should The version of fourth embodiment, its respectively with the first embodiment and the fourth embodiment Difference is in can not include the J output capacitance Co in charge pump of the present invention yet, only directly Electrical connection load, consequently, it is possible to also not interfere with above-mentioned first embodiment and the 4th The magnitude of voltage of the J output voltage Vo described in embodiment, and can have more diversified become Change.

In summary, charge pump of the present invention produces not phase by each single-direction conductor 2 Mutually disturb and stable output voltage, can more be switched by the detection unit 4 control the 4th S4 is made same with the output voltage Vo produced by the single-direction conductor 2 corresponding to strangulation Charge pump can provide the output voltage Vo of the different and stabilization of non-interference, more utilize The individual unidirectional biographies being electrically connected between the side Pu voltage generator 1 and the output capacitance Co of the J Lead device 2 and reach generation J group output voltages Vo so that the charge pump can drive multiple negative Carry, to reduce overall cost and power consumption, so the purpose of the present invention can be reached really.

Claims

1. a kind of charge pump, it is characterised in that the charge pump is included：

One side Pu voltage generator, it is controlled to switch on one first to produce one Side Pu voltage between level and second level；And

J single-direction conductor, respectively with a first end and second end, the J Second end of individual single-direction conductor all electrically connects the side Pu voltage generator to receive the side Pu voltage, each single-direction conductor is according to secondly whether the cross-pressure at end is more than a lock Value, to determine to be on and be not turned on alternative one, when in the J single-direction conductor Any one conducting when, that is, produce an output voltage for being positively correlated with the side Pu voltage, And from the output of its first end, J >=1, J is positive integer.

2. charge pump as claimed in claim 1, it is characterised in that the side Pu voltage generator Including：

One electric capacity, with a first end for exporting the side Pu voltage, and one Two ends,

One first switch, with a first end for receiving one first bias, and one It is individual electrically connect the electric capacity first end the second end, and it is controlled and switch on conducting with It is not turned on alternative one,

One second switch, the first end with second end for electrically connecting the electric capacity, And one receive one second bias the second end, and it is controlled and switch on conducting with Alternative one is not turned on, and

One the 3rd switch, with a first end for receiving one the 3rd bias, and one Second end at individual the second end for being electrically connected to the electric capacity, and it is controlled and switch on conducting With being not turned on alternative one,

Wherein, when the side Pu voltage generator operates in a first mode, this One switch and the second switch are controlled and turn on,

When the side Pu voltage generator operates in a second mode, the 3rd switch is controlled Make and turn on.

3. charge pump as claimed in claim 1, it is characterised in that the charge pump is also included J output capacitance, each output capacitance has the first end of a ground connection, and one Second end, the second end of the J output capacitance is electrically connected the J single-direction conductor Corresponding first end is to receive the output voltage, and J >=1, J is positive integer.

4. charge pump as claimed in claim 3, it is characterised in that the charge pump is also included：

I detection unit, respectively with one electrically connect the J output capacitance wherein it One the second end with receive the first input end of the corresponding output voltage, one connect The second input of a reference voltage, and an output end are received, and according to corresponding The output voltage and the reference voltage, its output end export a comparison signal, 0 ≤ I≤J, I are positive integer, and

The switches of I the 4th, be electrically connected in the corresponding detection unit this first The first end of input and the corresponding single-direction conductor, and by the comparison signal control Make and switch on conducting and be not turned on alternative one.

5. charge pump as claimed in claim 4, it is characterised in that each detection unit Including：

The resistance of two series connection, be electrically connected to the corresponding detection unit this first Between input and ground, and a branch pressure voltage is produced in common holds of two resistance, And

One comparator, electrically connects the common end of two resistance to receive with one The corresponding detection unit of the first end of the branch pressure voltage, an electrical connection this Two inputs are to receive the second end of the reference voltage, and an electrical connection is corresponding The output end of the detection unit is to export the output end of the comparison signal.

6. charge pump as claimed in claim 3, it is characterised in that the charge pump is also included：

I detection unit, electrically connects the J single-direction conductor wherein with one respectively One of first end with receive the corresponding output voltage first input end, one Receive the second input of a reference voltage, an and output end, and according to pair The output voltage and the reference voltage answered, a comparison signal is exported in its output end, 0≤I≤J, I are positive integer, and

I the 4th switch, is electrically connected second in the corresponding single-direction conductor To receive the side Pu voltage between end and the side Pu voltage generator, and by the comparison signal Control and switch on conducting and be not turned on alternative one.

7. charge pump as claimed in claim 6, it is characterised in that each detection unit bag Include：

Two series resistances, this for being electrically connected to the corresponding detection unit is first defeated Enter between end and ground, and one in two resistance holds one branch pressure voltage of generation jointly, And

One comparator, electrically connects the common end of two resistance to connect with one That receives the corresponding detection unit of the first end of the branch pressure voltage, an electrical connection should Second input is to receive the second end of the reference voltage, and an electrical connection is corresponding The detection unit the output end to export the output end of the comparison signal.

8. charge pump as claimed in claim 3, it is characterised in that the side Pu voltage generator Also include：

One electric capacity, with a first end, and one exports the of the side Pu voltage Two ends,

One first switch, with a first end for receiving first bias, and one It is individual electrically connect the electric capacity first end the second end, and it is controlled and switch on conducting with It is not turned on alternative one,

One second switch, the first end with second end for electrically connecting the electric capacity, And one receive this second bias the second end, and it is controlled and switch on conducting with not Alternative one is turned on, and

One the 3rd switch, the first end with a first end for electrically connecting the electric capacity, And one receive the 3rd bias the second end, and it is controlled and switch on conducting with not Turn on alternative one,

When the side Pu voltage generator operates in a second mode, the 3rd switch It is controlled and turn on.

9. charge pump as claimed in claim 8, it is characterised in that the charge pump is also included：

The switches of I the 4th, are electrically connected in the first defeated of the corresponding detection unit Enter the first end of end and the corresponding single-direction conductor, and controlled by the comparison signal And switch on conducting and be not turned on alternative one.

10. charge pump as claimed in claim 9, it is characterised in that each detection unit Including：

One comparator, with the corresponding detection unit of an electrical connection this Two inputs with receive the first end of the reference voltage, one electrically connect two resistance The common end to receive the second end of the branch pressure voltage, and an electrical connection is corresponding The detection unit the output end to export the output end of the comparison signal.

11. charge pump as claimed in claim 8, it is characterised in that the charge pump is also included：

12. charge pump as claimed in claim 11, it is characterised in that each detection is single Member includes:

One comparator, with a first end for receiving the reference voltage, an electricity The common end of two resistance of the corresponding detection unit of connection is to receive this point Second end of piezoelectricity pressure, and the output for electrically connecting the corresponding detection unit Hold to export the output end of the comparison signal.

13. charge pump as claimed in claim 1, it is characterised in that each single-direction conductor Including at least one diode, the negative electrode electrical connection of the diode it is corresponding this is unidirectional The first end of conductor, the unidirectional conduction corresponding to the anode electrical connection of the diode Second end of device.

14. charge pump as claimed in claim 1, it is characterised in that each single-direction conductor Including at least one diode, the anode electrical connection of the diode it is corresponding this is unidirectional The first end of conductor, the unidirectional conduction corresponding to the negative electrode electrical connection of the diode Second end of device.

15. charge pump as claimed in claim 1, it is characterised in that the J single-direction conductor One kind in diode, Schottky diode or its combination are may be selected from respectively.