KR20160098641A - Bootstrap circuit and power supply apparatus using thereof - Google Patents

Bootstrap circuit and power supply apparatus using thereof Download PDF

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Publication number
KR20160098641A
KR20160098641A KR1020150020118A KR20150020118A KR20160098641A KR 20160098641 A KR20160098641 A KR 20160098641A KR 1020150020118 A KR1020150020118 A KR 1020150020118A KR 20150020118 A KR20150020118 A KR 20150020118A KR 20160098641 A KR20160098641 A KR 20160098641A
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KR
South Korea
Prior art keywords
circuit
driver
clamp circuit
bootstrap
bootstrap circuit
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Application number
KR1020150020118A
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Korean (ko)
Inventor
박윤호
Original Assignee
주식회사 솔루엠
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Priority to KR1020150020118A priority Critical patent/KR20160098641A/en
Publication of KR20160098641A publication Critical patent/KR20160098641A/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/06—Modifications for ensuring a fully conducting state
    • H03K17/063—Modifications for ensuring a fully conducting state in field-effect transistor switches
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H03K17/687—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Power Conversion In General (AREA)

Abstract

A bootstrap circuit and a power supply using the bootstrap circuit are disclosed. A bootstrap circuit according to an embodiment includes a first clamp circuit located in a bootstrap circuit and generating a power supply to each block in the bootstrap circuit using an external power supply; And a first driver which is located in the bootstrap circuit and generates a first switch driving signal for driving an external first switching element, wherein the first driver controls the maximum level of the first switch driving signal And a second clamp circuit for clamping the first clamp circuit.

Figure P1020150020118

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a bootstrap circuit and a power supply using the bootstrap circuit.

The following embodiments relate to bootstrap circuit design, and more particularly to a bootstrap circuit applied to a switching mode converter or a power supply.

The bootstrap circuit refers to a circuit for securing the gate potential when driving a high-side switching device, for example, a MOSFET, on the N-channel.

The bootstrap circuit depends on the voltage supplied from outside the bootstrap circuit, for example, the VCC voltage, and may include a Hi-Voltage process. In the MOSFET of the Hi-Voltage process, the drain- voltage) is sufficiently high, but the gate-source (Vgs) withstand voltage may be lower than the Vds withstand voltage.

Such a bootstrap circuit or bootstrap integrated circuit (IC) uses a voltage difference between two terminals, for example, a VS terminal and a VB terminal, as an operating voltage of each element included in the circuit.

The bootstrap circuit according to the embodiment includes a first clamp circuit for generating a supply power source and a second clamp circuit for controlling a maximum level of the drive signal.

At this time, the two clamp circuits are located in the bootstrap circuit, and the second clamp circuit can be located in the driver for driving the switching elements.

At this time, the driver can directly supply the power for the output of the driving signal from the input power source of the first clamping circuit, thereby securing the drive function for the driving switching element.

At this time, the first clamp circuit can generate the supply power in consideration of the internal pressure of the semiconductor element of the internal block, and the second clamp circuit can control the maximum level of the drive signal in consideration of the breakdown voltage of the switching element.

The bootstrap circuit according to the embodiment can be applied to a converter that converts the first power supply to the second power supply, a power supply device that supplies power to the load, and the like, and the application field is not limited as long as the bootstrap circuit is used.

According to these embodiments, it is possible to minimize the damage and destruction that may occur in the IC internal elements and the external switching elements by using the bootstrap circuit, but not necessarily, the two clamp circuits, and the bootstrap circuit The reliability of the product can be improved.

Fig. 1 shows an example circuit diagram for explaining a bootstrap circuit.
2 is a circuit diagram of an example for explaining an external VCC clamp circuit.
3 shows an example for explaining the configuration of the bootstrap circuit.
4 shows a configuration for a bootstrap circuit according to an embodiment.
Fig. 5 shows a circuit diagram of an embodiment of the first clamping circuit shown in Fig.
6 shows a circuit diagram of an embodiment of the second clamping circuit shown in Fig.
7 shows an example of a timing diagram for explaining a bootstrap circuit according to an embodiment.
FIG. 8 shows an example of a synchronous switching mode converter to which a bootstrap circuit according to an embodiment is applied.
9 shows an example of an asynchronous switching mode converter to which a bootstrap circuit according to an embodiment is applied.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to or limited by the embodiments. In addition, the same reference numerals shown in the drawings denote the same members.

1 shows a circuit diagram for explaining a bootstrap circuit. As shown in FIG. 1, a bootstrap circuit 110 compares a voltage difference between VS and VB by a VCC voltage, And the voltage difference between the VS and the VB becomes the Vgs voltage of the external switching element SW1.

Such a bootstrap circuit can overcome the Vgs breakdown voltage of the internal elements of the bootstrap circuit or the external switching elements SW1 and SW2 when the Hi-voltage process is used, so that the internal or external switching elements may be destroyed or damaged In order to solve this problem, a VCC clamp circuit 210 is added to the outside as in the example shown in FIG.

That is, the bootstrap circuit 220 shown in FIG. 2 adds a VCC clamp circuit 210 to the outside and uses the external switching elements SW1 and SW2 as elements having a high Vgs internal pressure, And it is possible to reduce the possibility that the external switching element may be destroyed or damaged. Of course, FIG. 2 shows an increase in the number and cost of external components because the external clamp circuit 210 is added while using the bootstrap circuit as shown in FIG. 1 and a switching device having a high breakdown voltage is used.

The bootstrap circuit used in FIGS. 1 and 2 may be the same as the example shown in FIG. 3. As shown in FIG. 3, the bootstrap circuit 220 may include an external power source, for example, (Block A, Block B, Driver, etc.) to which the output power of the VCC clamp circuit 210 of FIG. 2 is directly supplied. Depending on the situation, the bootstrap circuit can be divided into a high-side block and a low-side block, which is driven by the number of external switching elements to drive the external switching element There can be one and two drivers depending on the case.

For example, a bootstrap circuit may include only a high-side block if there is one external switching element, and both a high-side block and a low-side block if there are two external switching elements.

At this time, when the bootstrap circuit switches the HO signal and the LO signal at the maximum breakdown voltage of the internal element, the external switching elements SW1 and SW2, which are switched by the HO signal and the LO signal due to the influence of switching noise, There is also a possibility.

1 to 3, the bootstrap circuit can be damaged or destroyed by an internal element or an external switching element due to an internal pressure problem of an internal element and an external switching element of the bootstrap circuit. In order to prevent this, A clamp circuit is used for the power supply VCC supplied to the bootstrap circuit, and an external switching device having a high breakdown voltage is used. However, there may be an increase in the number and cost of external components and damage or breakage of the external switching device.

Embodiments include a power generation clamp circuit for supplying power to each block of the bootstrap circuit in the bootstrap circuit and a clamp circuit for controlling the output signal level of the driver for driving the external switching element, And the reliability of a product using the bootstrap circuit is improved by minimizing the damage and destruction that may occur in the bootstrap circuit.

The bootstrap circuit of the embodiments may include only a high-side block and may include both a high-side block and a low-side block. For convenience of explanation, the high-side block will be mainly described.

It is apparent to those skilled in the art that the bootstrap circuit of the embodiments is described as a bootstrap integrated circuit, but is not limited to a bootstrap integrated circuit, and can be applied to an integrated circuit.

4 shows a configuration for a bootstrap circuit according to an embodiment.

4, a bootstrap circuit 400 according to one embodiment includes a first clamp circuit 410, at least one driver 420, and a second clamp circuit 430. The bootstrap circuit 400 includes a first clamp circuit 410,

Of course, the bootstrap circuit 400 may include various blocks that constitute a general bootstrap circuit as well as a first clamp circuit 410, at least one driver 420 and a second clamp circuit 430, A, and Block B, respectively. In the embodiments, the description of the blocks constituting the bootstrap circuit is omitted and the clamp circuit is mainly described.

The first clamp circuit 410 is disposed in the bootstrap circuit 400 and uses a power supply VB input to the circuit by the external power supply VCC to supply power to the blocks constituting the bootstrap circuit VB_CLAMP).

That is, the first clamp circuit 410 generates a VB_CLAMP supply voltage using the VB power supply, and supplies the generated VB_CLAMP supply voltage to at least one block constituting the high-side block and at least one block constituting the low- Supply.

The first clamp circuit 410 may be provided with a plurality of current sources, a zener diode, a plurality of semiconductor elements, e.g., FETs and resistors R1, R2, as in the example shown in FIG. Power VB_CLAMP can be generated. Of course, the first clamp circuit 410 is not limited to the configuration of FIG. 5 and may include all circuits capable of generating the power supply VB_CLAMP using the input power VB.

At this time, the first clamp circuit 410 generates a voltage equal to or lower than the gate-source voltage (Vgs) of the semiconductor element included in each block constituting the bootstrap circuit, for example, as the power supply voltage VB_CLAMP .

The first clamp circuit 410 may be designed to generate the supply voltage VB_CLAMP in consideration of the gate-source breakdown voltage of the semiconductor device included in the blocks constituting the bootstrap circuit 400. [ That is, the first clamp circuit 410 can be designed in consideration of the Vgs breakdown voltage of the semiconductor devices because the supply power value to be generated may vary depending on the Vgs internal pressure of the semiconductor devices constituting the bootstrap circuit.

The driver 420 generates and outputs a switching driving signal for driving the external switching element SW1 to the external switching element and a switching driving signal controlled to a maximum level using the second clamping circuit 430. [

At this time, the driver 420 may include a second clamp circuit 430, a first drive switching device M1 and a second drive switching device M2, and may be controlled by the second clamp circuit 430 The switching driving signal having the maximum level can be outputted to the external switching element SW1.

In the embodiment, the driver 420 may be a high-side driver, and power for the output of the switching drive signal is directly supplied from the input power VB of the bootstrap circuit for a drive function to drive the external switching element. That is, since the drain of the first drive switching device M 1 is directly connected to the input power supply VB of the bootstrap circuit, the drive function for the drive switching device can be ensured.

At this time, the first drive switching device Ml can be on / off controlled by the maximum level controlled by the second clamp circuit 430 and the VS voltage, and the second drive switching device M2 can be controlled by the first clamp May be on / off controlled by the VB_CLAMP voltage and the VS voltage generated by the circuit 410. This will be described again in FIG.

The second clamp circuit 430 controls the maximum level of the output signal output from the driver 420, that is, the switching driving signal (HO signal) for driving the external switching element SW1. Located.

Of course, although the second clamp circuit 430 is illustrated as being located in the driver block in FIG. 4, it is not limited thereto, and may be located in a part of the bootstrap circuit other than the inside of the driver block.

In this case, the second clamp circuit 430 is connected in series to the gate of the M1 drive switching element, so that any one of the two drive switching elements constituting the driver 420, It is possible to control the maximum level of the switching driving signal (HO signal).

The second clamping circuit 430 may include a plurality of current sources, a zener diode, a plurality of semiconductor elements, e.g., FETs and resistors R1, R2, R3, as in the example shown in FIG. R2 and R3 connected in parallel to the reference voltage Vref determined by the input power supply VB applied to the bootstrap circuit from the outside, R3) can be used to control the maximum level of the output signal (HO signal) of the driver. 6, the reference voltage Vref may be determined by the input power supply VB, VS, the current source and the zener diode, and the second clamp circuit 430 may be determined based on the resistor- And controls the maximum level of the switching drive signal (HO signal) output from the driver.

At this time, the maximum output level output from the second clamp circuit 430 to the gate of the M1 drive switching element may be smaller than the supply voltage VB_CLAMP supplied from the first clamp circuit 410. [

The second clamp circuit 430 is designed to control the maximum level of the switch driving signal in consideration of an external switching element that operates by receiving the switching driving signal, for example, the gate-source voltage of SW1 shown in FIG. 4 . That is, the second clamp circuit 430 can be designed in consideration of the Vgs breakdown voltage of the external switching element since the maximum level of the switching driving signal controlled in accordance with the Vgs internal voltage of the external switching element can be changed.

As described above, since the bootstrap circuit according to the embodiment includes the clamp circuit for power generation of each block in the bootstrap circuit, it is not necessary to provide a VCC clamp circuit on the outside, thereby reducing the number of external components.

The bootstrap circuit according to the embodiment includes a clamp circuit for controlling the maximum level of the output signal of the driver in consideration of the breakdown voltage of the external switching element in the bootstrap circuit or in the driver so that the maximum level of the HO signal and the LO signal Thereby making it possible to secure a margin for destruction of the external switching element and to improve the reliability of a product to which the bootstrap circuit is applied.

That is, the bootstrap circuit according to the embodiment includes the clamp circuit for power supply generation considering the breakdown voltage with respect to the semiconductor elements in the circuit and the clamp circuit at the driver end in consideration of the breakdown voltage of the external switching element, For example, switching mode converters, adapters, power supplies, and the like.

Although the first clamp circuit 410 and the high-side block are separately shown in Fig. 4, the high-side block may include the first clamp circuit 410. [

Although only the high-side block is illustrated in FIG. 4, the low-side driver provided in the low-side block also includes a clamp circuit for controlling the maximum level of the switching drive signal (LO signal) output from the low-side driver.

That is, when the bootstrap circuit includes a low-side driver, a third clamp circuit (not shown) for controlling the maximum level for the switching drive signal (LO signal) of the low-side driver is provided.

At this time, the third clamp circuit may be the same as the second clamp circuit 430 shown in FIG. 6, and the low-side driver may include two drive switching elements connected in series like the high-side driver. Like the second clamp circuit, the third clamp circuit can be connected to the gate of any one of the drive switching elements of the low-side driver. By providing the third clamp circuit for controlling the maximum level of the output signal of the low-side driver in the low-side block, it is possible to secure a margin for the breakdown of the external switching element connected to the output terminal of the low-side block .

7 shows an example of a timing diagram for explaining a bootstrap circuit according to an embodiment.

7, in the bootstrap circuit according to the embodiment, the VB_CLAMP voltage generated by the first clamp circuit receiving the external VB voltage is generated to be lower than the VB voltage, and the M1 drive switching The device is applied with the maximum level and the VS voltage controlled by the second clamp circuit for the on / off switching of M1 as the gate voltage, and the M2 drive switching device constituting the driver switches the first It can be seen that the VB_CLAMP voltage and the VS voltage generated by the clamp circuit are applied to the gate voltage.

It can be seen that the maximum level of the switching driving signal (HO signal) outputted from the high-side driver to the external switching element SW1 is different by Vgs at the maximum level applied to the gate voltage of the M1 switching element.

The bootstrap circuit according to this embodiment can be applied to various products such as a switching mode converter, an adapter, a power supply, and the like, and a switching mode converter will be described as an example.

FIG. 8 illustrates an example of a synchronous switching mode converter to which a bootstrap circuit according to an embodiment is applied, and FIG. 9 illustrates an example of an asynchronous switching mode converter to which a bootstrap circuit according to an embodiment is applied.

8 and 9, a synchronous switching mode converter 800 includes a first switching device SW1 driven by the output signal of the high-side driver of the bootstrap circuit 400, A second switching device SW2 driven by an output signal of the side driver is provided to supply power to a load (not shown) under the control of the first switching device and the second switching device.

At this time, since the bootstrap circuit 400 applied to the synchronous switching mode converter 800 includes both the high-side driver as well as the low-side driver, the bootstrap circuit 400 including both the first clamp circuit to the third clamp circuit .

8, since the asynchronous switching mode converter 900 includes the diode D2 instead of the second switching device SW2 shown in FIG. 8, the asynchronous switching mode converter 900 has the second switching It is not necessary to provide the low-side block for driving the element SW2. Therefore, the bootstrap circuit 900 requires only the high-side block, and can be configured only by the configuration including the first clamp circuit and the second clamp circuit.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. For example, it is to be understood that the techniques described may be performed in a different order than the described methods, and / or that components of the described systems, structures, devices, circuits, Lt; / RTI > or equivalents, even if it is replaced or replaced.

Therefore, other implementations, other embodiments, and equivalents to the claims are also within the scope of the following claims.

Claims (18)

In the bootstrap circuit,
A first clamp circuit which is located in the bootstrap circuit and generates a supply power to be supplied to each block in the bootstrap circuit using an external power supply; And
A first driver located in the bootstrap circuit and generating a first switch driving signal for driving an external first switching element;
Lt; / RTI >
The first driver
A second clamp circuit for controlling a maximum level of the first switch driving signal,
/ RTI >
The method according to claim 1,
The first driver
Wherein the power supply for the output of the first switching drive signal is directly supplied from the external power supply.
The method according to claim 1,
The first driver
A first drive switching element and a second drive switching element connected in series,
The second clamp circuit
And the first drive switching element is connected in series to the gate of the first drive switching element.
The method according to claim 1,
A second driver which is located in the bootstrap circuit and generates a second switch driving signal for driving an external second switching element connected in series with the first switching element;
Further comprising:
The second driver
And a third clamp circuit for controlling a maximum level of the second switch driving signal
The bootstrap circuit comprising:
The method according to claim 1,
The power supply
Wherein a voltage between the gate and the source of the semiconductor device constituting each of the blocks is equal to or smaller than a voltage between the gate and the source of the semiconductor device constituting each of the blocks.
The method according to claim 1,
The second clamp circuit
Wherein the maximum level of the first switch driving signal is controlled by using the resistance division ratio of resistors connected in parallel with a reference voltage determined by the external power supply.
The method according to claim 1,
The first clamp circuit
And said power supply circuit is designed to generate said supply power in consideration of a breakdown voltage between a gate and a source of a semiconductor element constituting each of said blocks.
The method according to claim 1,
The second clamp circuit
Wherein the first switch is designed to control a maximum level of the first switch driving signal in consideration of a breakdown voltage between the gate and the source of the first switching element.
In the bootstrap circuit,
A first clamp circuit located in the bootstrap circuit, the first clamp circuit generating a supply power supplied to each block in the bootstrap circuit; And
A second clamp circuit located in at least one driver in the bootstrap circuit;
/ RTI >
10. The method of claim 9,
The first clamp circuit
And said power supply circuit is designed to generate said supply power in consideration of a breakdown voltage between a gate and a source of a semiconductor element constituting each of said blocks.
10. The method of claim 9,
The driver
And the power supply to the output of the driver is directly supplied from an input power source input to the first clamp circuit.
In the bootstrap circuit,
A first clamp circuit located in the bootstrap circuit and generating a supply power; And
A second clamp circuit located in said bootstrap circuit, for controlling a maximum level for an output signal of at least one driver in said bootstrap circuit;
/ RTI >
13. The method of claim 12,
The second clamp circuit
And the control circuit is designed to control the maximum level for the output signal in consideration of the gate-source breakdown voltage of the switching element receiving the output signal.
13. The method of claim 12,
The second clamp circuit
Wherein a maximum level of the output signal is controlled by using a resistance division ratio of resistors connected in parallel with a reference voltage determined by the supply voltage.
A switching element which is on / off controlled by a switch driving signal and supplies power to a load; And
A bootstrap circuit for controlling the switching element with the switch driving signal;
Lt; / RTI >
The bootstrap circuit
A first clamp circuit for generating a supply power supplied to each block in the bootstrap circuit; And
A second clamp circuit located in at least one driver in the bootstrap circuit, for controlling a maximum level of the switch driving signal;
≪ / RTI >
16. The method of claim 15,
The first clamp circuit
And the power supply is designed to generate the supply power in consideration of a breakdown voltage between the gate and the source of the semiconductor element constituting each of the blocks.
16. The method of claim 15,
The second clamp circuit
Wherein the power supply circuit is designed to control a maximum level for the switch driving signal in consideration of a breakdown voltage between the gate and the source of the switching device.
16. The method of claim 15,
The driver
Wherein the power supply for the output of the driver is directly supplied from the input power supply of the first clamping circuit and the switch driving signal is output to the switching element under the control of the second clamping circuit.
KR1020150020118A 2015-02-10 2015-02-10 Bootstrap circuit and power supply apparatus using thereof KR20160098641A (en)

Priority Applications (1)

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KR1020150020118A KR20160098641A (en) 2015-02-10 2015-02-10 Bootstrap circuit and power supply apparatus using thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150020118A KR20160098641A (en) 2015-02-10 2015-02-10 Bootstrap circuit and power supply apparatus using thereof

Publications (1)

Publication Number Publication Date
KR20160098641A true KR20160098641A (en) 2016-08-19

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Family Applications (1)

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Country Link
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