CN204103759U - Be applicable to power supply circuits and the bridge circuit of upper switching tube driving in bridge circuit - Google Patents
Be applicable to power supply circuits and the bridge circuit of upper switching tube driving in bridge circuit Download PDFInfo
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- CN204103759U CN204103759U CN201420536013.6U CN201420536013U CN204103759U CN 204103759 U CN204103759 U CN 204103759U CN 201420536013 U CN201420536013 U CN 201420536013U CN 204103759 U CN204103759 U CN 204103759U
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Abstract
A kind of power supply circuits and bridge circuit being applicable to upper switching tube driving in bridge circuit.Bridge circuit, comprise: the upper switching tube of bridge joint of mutually connecting and lower switching tube, lower switching tube one polar end ground connection, another polar end is connected with the first polar end of upper switch, also comprise: voltage conversion circuit, the positive pole of input is connected with the first voltage input end, negative pole is connected with the first polar end of upper switching tube, output is connected with the drive circuit of upper switching tube, for according to the first voltage, generate and export an output voltage, operating voltage is provided with the drive circuit of upwards switching tube, pressure drop constant between the voltage of the first polar end of output voltage and upper switching tube, filter capacitor, one end is connected with the output of voltage conversion circuit, and the other end is connected with the connected node between upper switching tube with lower switching tube.Apply this technical scheme, be conducive to the integrated chip design improving circuit, reduce costs.
Description
Technical field
The utility model relates to electronic applications, particularly a kind of power supply circuits and bridge circuit being applicable to upper switching tube driving in bridge circuit.
Background technology
Be widely used with converter (such as BOOST converter or BUCK converter etc.) by the two switching tubes bridge switching circuit that bridge joint forms a complementary drive of mutually connecting.
In bridge switching circuit, the switching tube of a wherein polar end ground connection is designated as lower switching tube, and be connected with lower switching tube by a polar end, the switching tube that another polar end is connected with the input of external input voltage LVin is designated as upper switching tube.
In gapping switch circuit, generally for and reduce device volume, save cost, in prior art, often use a driving power to provide operating voltage for the drive circuit of two switching tubes.Further, in order to save the area of chip, in same conducting resistance situation, the switching tube of NMOS type is preferentially selected.
Fig. 1 is to the power supply circuits application principle schematic diagram that bridge circuit breaker in middle tube drive circuit is powered in prior art.
Shown in Figure 1.The reference point of the power supply of the drive circuit of lower switching tube LMOS is the ground of chip, therefore constant supply power voltage Vpp can meet the power demands of lower switch tube driving circuit.
And the reference point of the power supply of the drive circuit of upper switching tube HMOS is first polar end of upper switching tube HMOS and the connected node (being designated as tie point LX) of lower switching tube LMOS, according to the operation principle of switching circuit, tie point LX is a high frequency square wave trip point.Therefore needing a suspended power supply circuit, this suspended power supply circuit is attached on LX voltage, provides power supply for giving the drive circuit of upper switching tube.
Boostrap circuit is a kind of circuit that can produce suspended power supply the most general at present.Figure 1 shows that bootstrap approach, its operation principle is as follows: low voltage voltage Vpp drives the drive circuit 101 of lower switching tube LMOS, drives lower switching tube LMOS conducting and shutoff.Lower switching tube LMOS conduction period, the current potential of tie point LX is pulled down to ground, low voltage voltage Vpp is charged to bootstrap capacitor Cboost by bootstrap diode D, forms a suspended power supply by bootstrap capacitor Cboost at bootstrap capacitor Cboost two ends (namely between Node B ST and tie point LX).Close at lower switching tube LMOS and have no progeny, be stored in bootstrap capacitor Cboost and power to the drive circuit 102 of upper switching tube HMOS, switching tube HMOS conducting in driving, and it is open-minded to maintain upper switching tube.
Shown in Figure 1, if input voltage Hvin is high pressure, then produce low voltage voltage Vpp by a linear regulation circuit 103; If input voltage Hvin is low pressure, then can be directly used in driving power Hvin and comes to charge to bootstrap capacitor Cboost, and to the power supply of the drive circuit 101 of lower switching tube LMOS.
The present inventor is carrying out finding in research process of the present utility model, and prior art exists following defect:
Although the existence of the boostrap circuit shown in Fig. 1 makes the drive circuit of upper and lower two switching tubes of same brachium pontis only need an external power supply.But, when chip design, because bootstrap capacitor Cboost generally can not be integrated in chip internal more greatly, need many pins " BST " to carry out external bootstrap capacitor Cboost, and external bootstrap capacitor Cboost is unfavorable for PCB fabric swatch.
Utility model content
The utility model embodiment object is: provide a kind of power supply circuits and the bridge circuit that are applicable to upper switching tube driving in bridge circuit.Apply this technical scheme, be conducive to the integrated chip design improving circuit, reduce costs.
First aspect, a kind of power supply circuits of powering for switching tube upper in bridge circuit that the utility model embodiment provides, described bridge circuit is made up of described upper switching tube and lower switching tube bridge joint of mutually connecting, described lower switching tube one polar end ground connection, another polar end is connected with the first polar end of described upper switch, also comprises:
Voltage conversion circuit, the positive pole of input is connected with the first voltage input end, negative pole is connected with the first polar end of described upper switching tube, output is connected with the drive circuit of described upper switching tube, for according to described first voltage, generate and export an output voltage, to provide operating voltage to the drive circuit of described upper switching tube, the pressure drop constant between the voltage of the first polar end of described output voltage and described upper switching tube;
Filter capacitor, one end is connected with the output of described voltage conversion circuit, and the other end is connected with the connected node between described upper switching tube with lower switching tube.
In conjunction with first aspect, under the first implementation, the capacitance of described filter capacitor is: C=(2Vo1/Vripple) * Cp,
Described C is: the capacitance of described filter capacitor,
Vo1 is: the amplitude of the pressure drop between described output voltage and the connected node between described upper switching tube and lower switching tube, and Cp is: the capacitance of the parasitic capacitance between described voltage conversion circuit output and the earth terminal of described bridge circuit,
Vripple is: the ripple higher limit of the pressure drop between the voltage of the first polar end of described output voltage and described upper switching tube.
Second aspect, a kind of bridge circuit that the utility model embodiment provides, comprising: the upper switching tube of bridge joint of mutually connecting and lower switching tube, described lower switching tube one polar end ground connection, and another polar end is connected with the first polar end of described upper switch, also comprises:
Voltage conversion circuit, the positive pole of input is connected with the first voltage input end, negative pole is connected with the first polar end of described upper switching tube, output is connected with the drive circuit of described upper switching tube, for according to described first voltage, generate and export an output voltage, to provide operating voltage to the drive circuit of described upper switching tube, the pressure drop constant between the voltage of the first polar end of described output voltage and described upper switching tube;
Filter capacitor, one end is connected with the output of described voltage conversion circuit, and the other end is connected with the connected node between described upper switching tube with lower switching tube.
In conjunction with second aspect, under the first implementation, the capacitance of described filter capacitor is: C=(2Vo1/Vripple) * Cp,
Described C is: the capacitance of described filter capacitor,
Vo1 is: the amplitude of the pressure drop between described output voltage and the connected node between described upper switching tube and lower switching tube, and Cp is: the capacitance of the parasitic capacitance between described voltage conversion circuit output and the earth terminal of described bridge circuit,
Vripple is: the ripple higher limit of the pressure drop between the voltage of the first polar end of described output voltage and described upper switching tube.
In conjunction with second aspect, under the first implementation, also comprise:
Linear regulation circuit, input is connected with described first voltage input end, and output is connected with the drive circuit of described lower switching tube, for carrying out Serial regulation to described first voltage, export predetermined supply power voltage, think that the drive circuit of described lower switching tube provides operating voltage.
In conjunction with second aspect, under the first implementation, described first voltage input end is also connected with the drive circuit of described lower switching tube, and described second voltage provides operating voltage for the drive circuit of described lower switching tube.
Therefore, application the present embodiment technical scheme, the circuit be made up of voltage conversion circuit and filter capacitor can be always the supply power voltage that upper switch tube driving circuit provides required, the function of filter capacitor in the present embodiment circuit is only filtering, and without the need to carrying out charge storage and release with it, therefore do not need management of charging and discharging and protective circuit;
In addition, the function of the present embodiment filter capacitor in the present embodiment circuit is only filtering, its capacitance also can be far smaller than the capacitance magnitude needed for bootstrap capacitor of the prior art, thus the filter capacitor of selection of small capacitance can meet the application requirement of the present embodiment circuit, thus when circuit realiration, can be in the chips integrated by filter capacitor easily, be conducive to the integrated chip design of circuit.
In addition, relative to the technical scheme of bootstrap approach shown in Fig. 1, the present embodiment circuit is without the need to designing the external pin of electric capacity of external large capacitance, the few PIN of integrated circuit (IC) chip can be made, be conducive to simplifying PCB layout, improve the convenience of circuit application, reduce circuit cost.
In addition, application the present embodiment technical scheme can make the equal Integration Design of whole devices of circuit in the chips, is also conducive to the stability improving circuit application.
Accompanying drawing explanation
Fig. 1 is to the power supply circuits application principle schematic diagram that bridge circuit breaker in middle tube drive circuit is powered in prior art;
The power supply circuits of the upper switching tube HMOS2 driving of a kind of bridge circuit be applicable in BUCK transducer that Fig. 2 provides for the present embodiment 1;
Fig. 3 is the equivalent structure schematic diagram of the drive circuit of upper switching tube in filter capacitor and bridge circuit;
The power supply circuits of the upper switching tube HMOS2 driving of a kind of bridge circuit be applicable in BOOST transducer that Fig. 4 provides for the present embodiment.
Embodiment
Describe the utility model in detail below in conjunction with accompanying drawing and specific embodiment, be used for explaining the utility model in this illustrative examples of the present utility model and explanation, but not as to restriction of the present utility model.
Embodiment 1:
The power supply circuits of the upper switching tube HMOS2 driving of a kind of bridge circuit be applicable in BUCK transducer that Fig. 2 provides for the present embodiment 1.
Shown in Figure 2, this BUCK converter circuit comprises: upper switching tube HMOS2, the lower switching tube LMOS2 of series connection bridge joint.Wherein, one polar end of lower switching tube LMOS2 is (for NMOS tube in figure, for example source electrode " S ") ground connection, first polar end of another polar end (such as drain electrode " D ") and upper switching tube HMOS2 is (for NMOS tube in figure, for example source electrode " S ") connect, connect node and be designated as tie point LX.In BUCK converter circuit, input voltage vin is from the second polar end (in figure for example drain electrode " the D ") input of upper switching tube HMOS2, and the switching tube circuit consisted of bridge circuit provides energy to load end.
Drive circuit (being designated as the second drive circuit) is connected with at the control end (such as the grid " G " in Fig. 2) of lower switching tube LMOS2, the reference point of the supply power voltage of the second drive circuit is: the earth terminal of lower switching tube LMOS2, therefore when if the first voltage Hvin is high pressure, a linear regulation circuit (not shown in FIG.) can be connected between the first voltage input end with the second drive circuit, produce supply power voltage Vpp; If when the first voltage Hvin is low pressure, can supply power voltage directly using the first voltage Hvin as lower switching tube LMOS2 drive circuit.
It should be noted that, according to above-mentioned realization, can also can be, but not limited to other realizations conventionally for driving the power supply of second drive circuit of lower switching tube LMOS2.
Be connected with drive circuit (being designated as the first drive circuit) at the control end (such as the grid " G " in figure) of upper switching tube HMOS2, the reference point of the supply power voltage of the first drive circuit is tie point LX.
The present embodiment adopts a voltage conversion circuit 201 and filter capacitor C to form a suspended power supply circuit 200, adopts this suspended power supply circuit 200 to provide supply power voltage to the second drive circuit.Wherein, the positive pole of the input of voltage conversion circuit 201 is connected with the first voltage input end, negative pole is connected with the connected node LX between lower switching tube LMOS2 with first polar end of upper switching tube HMOS2, output is connected with the first drive circuit, for generating a voltage Vbst according to the first voltage Hvin, make the voltage V of voltage Vbst and connected node LX
lXbetween pressure drop constant, and with the voltage V of voltage Vbst and connected node LX
lXbetween pressure drop as the supply power voltage to the first drive circuitry, namely as the output voltage Vo1 of this suspended power supply circuit 200.
One end of filter capacitor C is connected with the output of voltage conversion circuit 201, the other end is connected with connected node LX, filter capacitor C carries out filtering to output voltage Vo1, thinks the supply power voltage that the first drive circuit provides ripple less, thus drives HMOS2 conducting and shutoff.
Therefore, in the circuit shown in Fig. 2, no matter go up switching tube HMOS2 and be in off state or conducting state, the suspended power supply circuit 200 be made up of voltage conversion circuit 201 and filter capacitor C can be always upper switching tube HMOS2 drive circuit and provide required supply power voltage, the function of filter capacitor C in the present embodiment circuit is only filtering, and without the need to carrying out charge storage and release with it, therefore do not need management of charging and discharging and protective circuit;
In addition, the function of the present embodiment filter capacitor C in the present embodiment circuit is only filtering, its capacitance also can be far smaller than the capacitance magnitude needed for bootstrap capacitor of the prior art, thus the filter capacitor C of selection of small capacitance can meet the application requirement of the present embodiment circuit, thus when circuit realiration, easily by the chips integrated for filter capacitor C, the integrated chip design of circuit can be conducive to.
In addition, relative to the technical scheme of bootstrap approach shown in Fig. 1, the present embodiment circuit is without the need to designing the external pin of electric capacity of external large capacitance, the few PIN of integrated circuit (IC) chip can be made, be conducive to simplifying PCB layout, improve the convenience of circuit application, reduce circuit cost.
In addition, application the present embodiment technical scheme can make the equal Integration Design of whole devices of circuit in the chips, is also conducive to the stability improving circuit application.
With further reference to the equivalent structure schematic diagram that Fig. 3, Fig. 3 are filter capacitor C and the first drive circuit.As seen from Figure 3, in the present embodiment, the capacitance of capacitance (being designated as C) value and the pressure drop Vo1 between output voltage Vbst and the voltage Vlx of connected node LX of filter capacitor C and the parasitic capacitance Cp between the voltage output end BST of voltage conversion circuit 201 and earth terminal is relevant.Specific as follows:
If it is Vripple that Current demands is used for the ripple higher limit of the output voltage Vo1 of the first drive circuitry, then the capacitance value of the filter capacitor C of current circuit requirement can be determined according to following formula (1):
C＝(2Vo1/Vripple)*Cp， (1)
From above formula (1), the capacitance of filter capacitor C and the capacitance of parasitic capacitance Cp in direct ratio, and be substantially the same order of magnitude.In fact, the capacitance of parasitic capacitance Cp is general less, is generally the decimal magnitude of 10p.Therefore in the present embodiment circuit, the decimal magnitude that the capacitance of filter capacitor C is generally about 10p can meet the power reguirements of the drive circuit as front upper switching tube HMOS2, the capacitance of filter capacitor C requires very little, when circuit realiration, can filter capacitor C be integrated in chip completely, be conducive to the Integration Design of circuit, and without the need to staying the connection pin of large capacitance electric capacity outward.
Embodiment 2:
The power supply circuits of the upper switching tube HMOS2 driving of a kind of bridge circuit be applicable in BOOST transducer that Fig. 4 provides for the present embodiment.
Comparison diagram 2,4 visible, the suspended power supply circuit 200 that the present embodiment is used for powering to upper switching tube HMOS2 is consistent with embodiment 1, and the institute of circuit shown in the present embodiment from Fig. 2 difference is only: the occasion of current power supply circuits application is different: be applied to BUCK converter circuit in embodiment 1; The present embodiment is applied to BOOST circuit.
In like manner, in the present embodiment, the capacitance of filter capacitor C can be determined according to following formula (1):
C＝(2Vo1/Vripple)*Cp， (1)
Visible, the capacitance of filter capacitor C requires very little in the present embodiment, when circuit realiration, can be integrated in chip by filter capacitor C completely, be conducive to the Integration Design of circuit, and without the need to staying the connection pin of large capacitance electric capacity outward.
The beneficial effect of the present embodiment is with embodiment 1, and therefore not to repeat here.
It should be noted that, above for the power supply circuits applying the present embodiment in BOOST converter and BUCK converter.But be not limited to this, the power supply of drive circuit comprising the upper switching tube HMOS2 in bridge circuit that bridge joint forms that mutually to be connected by upper switching tube HMOS2, lower switching tube LMOS2 can also be extended to.
Above-described execution mode, does not form the restriction to this technical scheme protection range.The amendment done within any spirit at above-mentioned execution mode and principle, equivalently to replace and improvement etc., within the protection range that all should be included in this technical scheme.
Claims (6)
1. one kind is applicable to the power supply circuits that in bridge circuit, upper switching tube drives, described bridge circuit is made up of described upper switching tube and lower switching tube bridge joint of mutually connecting, described lower switching tube one polar end ground connection, and another polar end is connected with the first polar end of described upper switch, it is characterized in that, also comprise:
Voltage conversion circuit, the positive pole of input is connected with the first voltage input end, negative pole is connected with the first polar end of described upper switching tube, output is connected with the drive circuit of described upper switching tube, for according to described first voltage, generate and export an output voltage, to provide operating voltage to the drive circuit of described upper switching tube
Pressure drop constant between the voltage of the first polar end of described output voltage and described upper switching tube;
Filter capacitor, one end is connected with the output of described voltage conversion circuit, and the other end is connected with the connected node between described upper switching tube with lower switching tube.
2. the power supply circuits being applicable to upper switching tube driving in bridge circuit according to claim 1, is characterized in that,
The capacitance of described filter capacitor is: C=(2Vo1/Vripple) * Cp,
Described C is: the capacitance of described filter capacitor,
Vo1 is: the amplitude of the pressure drop between described output voltage and the connected node between described upper switching tube and lower switching tube,
Cp is: the capacitance of the parasitic capacitance between described voltage conversion circuit output and the earth terminal of described bridge circuit,
Vripple is: the ripple higher limit of the pressure drop between the voltage of the first polar end of described output voltage and described upper switching tube.
3. a bridge circuit, comprising: the upper switching tube of bridge joint of mutually connecting and lower switching tube, described lower switching tube one polar end ground connection, and another polar end is connected with the first polar end of described upper switch, it is characterized in that, also comprises:
Voltage conversion circuit, the positive pole of input is connected with the first voltage input end, negative pole is connected with the first polar end of described upper switching tube, output is connected with the drive circuit of described upper switching tube, for according to described first voltage, generate and export an output voltage, to provide operating voltage to the drive circuit of described upper switching tube, the pressure drop constant between the voltage of the first polar end of described output voltage and described upper switching tube;
Filter capacitor, one end is connected with the output of described voltage conversion circuit, and the other end is connected with the connected node between described upper switching tube with lower switching tube.
4. bridge circuit according to claim 3, is characterized in that,
The capacitance of described filter capacitor is: C=(2Vo1/Vripple) * Cp,
Described C is: the capacitance of described filter capacitor,
Vo1 is: the amplitude of the pressure drop between described output voltage and the connected node between described upper switching tube and lower switching tube,
Cp is: the capacitance of the parasitic capacitance between described voltage conversion circuit output and the earth terminal of described bridge circuit,
Vripple is: the ripple higher limit of the pressure drop between the voltage of the first polar end of described output voltage and described upper switching tube.
5. the bridge circuit according to claim 3 or 4, is characterized in that, also comprises:
Linear regulation circuit, input is connected with described first voltage input end, and output is connected with the drive circuit of described lower switching tube, for carrying out Serial regulation to described first voltage, export predetermined supply power voltage, think that the drive circuit of described lower switching tube provides operating voltage.
6. the bridge circuit according to claim 3 or 4, is characterized in that,
Described first voltage input end is also connected with the drive circuit of described lower switching tube, and described second voltage provides operating voltage for the drive circuit of described lower switching tube.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420536013.6U CN204103759U (en) | 2014-09-18 | 2014-09-18 | Be applicable to power supply circuits and the bridge circuit of upper switching tube driving in bridge circuit |
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| CN201420536013.6U CN204103759U (en) | 2014-09-18 | 2014-09-18 | Be applicable to power supply circuits and the bridge circuit of upper switching tube driving in bridge circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108880203A (en) * | 2018-07-31 | 2018-11-23 | 杭州国彪超声设备有限公司 | A kind of ultrasonic-frequency power supply driving circuit |
| CN109217671A (en) * | 2018-10-23 | 2019-01-15 | 广州金升阳科技有限公司 | One kind floating ground voltage stabilizing power supplying circuit |
| CN114204808A (en) * | 2021-11-17 | 2022-03-18 | 深圳技术大学 | BUCK voltage reduction circuit |
| CN114204801A (en) * | 2021-11-16 | 2022-03-18 | 深圳技术大学 | BUCK circuit |
-
2014
- 2014-09-18 CN CN201420536013.6U patent/CN204103759U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108880203A (en) * | 2018-07-31 | 2018-11-23 | 杭州国彪超声设备有限公司 | A kind of ultrasonic-frequency power supply driving circuit |
| CN109217671A (en) * | 2018-10-23 | 2019-01-15 | 广州金升阳科技有限公司 | One kind floating ground voltage stabilizing power supplying circuit |
| CN109217671B (en) * | 2018-10-23 | 2020-04-21 | 广州金升阳科技有限公司 | Floating ground voltage-stabilizing power supply circuit |
| WO2020082712A1 (en) * | 2018-10-23 | 2020-04-30 | 广州金升阳科技有限公司 | Floating-ground voltage stabilization power supply circuit |
| CN114204801A (en) * | 2021-11-16 | 2022-03-18 | 深圳技术大学 | BUCK circuit |
| CN114204808A (en) * | 2021-11-17 | 2022-03-18 | 深圳技术大学 | BUCK voltage reduction circuit |
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