CN218514276U - Bootstrap capacitor voltage-stabilizing auxiliary circuit and power converter with same - Google Patents
Bootstrap capacitor voltage-stabilizing auxiliary circuit and power converter with same Download PDFInfo
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- CN218514276U CN218514276U CN202222372786.2U CN202222372786U CN218514276U CN 218514276 U CN218514276 U CN 218514276U CN 202222372786 U CN202222372786 U CN 202222372786U CN 218514276 U CN218514276 U CN 218514276U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The utility model discloses a bootstrap electric capacity steady voltage auxiliary circuit and have bootstrap electric capacity voltage stabilizing circuit's power converter. The voltage-stabilizing auxiliary circuit of the bootstrap capacitor is used for a power converter with an upper arm switch and a lower arm switch, and comprises a driving control module and the bootstrap capacitor, wherein a first switch is electrically connected between one end of the bootstrap capacitor and a grounding end, a second switch is electrically connected with a connecting node of the upper arm switch and the lower arm switch and one end of the bootstrap capacitor, a second control end of the bootstrap capacitor and the upper arm switch receive the same control signal, and the other end of the bootstrap capacitor is electrically connected with an auxiliary power supply through the driving control module; the first switch can be conducted in the non-conducting period of any upper arm switch, so that the auxiliary power supply charges the bootstrap capacitor, and the second switch provides a discharging loop connecting the node to the other end of the bootstrap capacitor; the utility model discloses make the charging of bootstrap electric capacity not be subject to switching on of underarm switch, avoid bootstrap electric capacity not enough problem of charging.
Description
Technical Field
The utility model relates to a power converter's auxiliary circuit and power converter indicate a power converter's active bootstrap electric capacity steady voltage auxiliary circuit especially to and have this bootstrap electric capacity steady voltage auxiliary circuit's power converter.
Background
In the design of an active power converter, an upper arm switch and a lower arm switch connected in series are generally used to control the power of the input power converter. Among them, NMOS (N-channel metal oxide semiconductor) is used as a common switching element. In higher voltage applications, the upper arm switch requires a higher voltage difference for conducting. In this application scenario, a bootstrap capacitor is often used to establish the voltage difference, and then the voltage difference is used to drive the upper arm switch to turn on.
In an initial operation stage of the power converter, a voltage difference across the bootstrap capacitor needs to be established, and in practice, the bootstrap capacitor is usually connected to a conduction path of the lower arm switch, and a charging loop of the bootstrap capacitor is formed by utilizing a conduction time of the lower arm switch, so as to store energy in the bootstrap capacitor.
Referring to fig. 6, a conventional switch driving circuit of a power converter includes the bootstrap capacitor C and a driving control module 20. The driving control module 20 has a power source terminal VDD, a capacitor power supply terminal HB, an upper arm driving output terminal HO, a lower arm driving output terminal LO and a conduction control terminal HS, wherein the upper arm driving output terminal HO is electrically connected to the gate of the upper arm switch Qa, the lower arm driving output terminal LO is electrically connected to the gate of the lower arm switch Qb, and the conduction control terminal HS is connected to a connection node n1 between the upper arm switch Qa and the lower arm switch Qb. One end of the bootstrap capacitor C is connected to an auxiliary power V1 through the capacitor power-supplying terminal HB and the power terminal VDD, and the other end is electrically connected to the connection node n1. When the power converter is started, the driving control module 20 must first output a turn-on signal at the lower arm driving output terminal LO, so that the lower arm switch Qb is turned on, the charging loop of the bootstrap capacitor C forms a path, and the auxiliary power supply V1 charges the bootstrap capacitor C. During the operation of the power converter, the bootstrap capacitor C is also charged by the on-time of the lower arm switch Qb to maintain the voltage.
However, in an application requiring a very short time to start the power converter, such as a standby power supply device, since power must be supplied immediately, the time for which the lower arm switch Qb can be allowed to be turned on before the upper arm switch Qa is turned on is short, and the on time is insufficient for the bootstrap capacitor C to establish a sufficient potential; in some circuit converter applications, the lower arm switch Qb cannot be turned on first due to circuit topology, so that the bootstrap capacitor C cannot establish a potential; in some circuit topology applications and switching intervals, such as discontinuous conduction mode, the bootstrap capacitor C voltage will be too low and may even be depleted. As a result, the bootstrap capacitor C is unable to effectively achieve the function of driving the upper arm switch Qa to be turned on.
In summary, the bootstrap capacitor auxiliary circuit potential driven by the switch of the conventional power converter needs to be further improved.
SUMMERY OF THE UTILITY MODEL
In view of the charging of current power converter bootstrap capacitor circuit is subject to the on-time of lower arm switch, the utility model provides a bootstrap capacitor voltage stabilization auxiliary circuit, an upper arm switch and a lower arm switch are connected to the electricity, contain:
a drive control module having a power supply terminal, an upper arm drive output terminal, a lower arm drive output terminal, a capacitor power supply terminal and a conduction control terminal; the power supply end is used for being connected with an auxiliary power supply, the upper arm driving output end is electrically connected with a control end of the upper arm switch, the lower arm driving output end is electrically connected with a control end of the lower arm switch, and the capacitor power supply end is electrically connected with the power supply end;
a first switch electrically connected between the conduction control terminal and a grounding terminal;
a second switch electrically connected between the conduction control terminal of the driving control module and a connection node of the upper arm switch and the lower arm switch, and having a second control terminal electrically connected to the upper arm driving output terminal; and
a bootstrap capacitor electrically connected between the capacitor power supply terminal and the conduction control terminal; wherein the content of the first and second substances,
when the first switch is turned on, the auxiliary power supply charges the bootstrap capacitor through the capacitor power supply terminal;
when the drive control module makes the capacitor power supply end and the upper arm drive output end form conduction, the bootstrap capacitor discharges to the control ends of the upper arm switch and the second switch through the capacitor power supply end and the upper arm drive output end, the second switch forms conduction between the connection node and the conduction control end, and the upper arm switch is conducted.
In the voltage stabilizing auxiliary circuit of the bootstrap capacitor, the first switch is used to provide a charging path of the bootstrap capacitor, and the second switch provides a discharging path of the bootstrap capacitor for providing a conducting voltage to the control terminal of the upper arm switch. When the first switch is turned on, a charging loop is formed from an auxiliary power supply, the bootstrap capacitor and the ground terminal, the auxiliary power supply charges the bootstrap capacitor, and a voltage difference required by the turn-on of the upper arm switch is established on the bootstrap capacitor. When the drive control module makes the capacitor power supply end and the upper arm drive output end form conduction, a power supply path is formed between the first end of the bootstrap capacitor and the control end of the upper arm switch, and the second switch makes the upper arm switch form a conduction path between the connection node and the second end of the bootstrap capacitor, so that a discharge path of the bootstrap capacitor is completed.
The utility model discloses borrow by this first switch and this second switch and form the route of charging and discharging of bootstrap capacitor respectively for bootstrap capacitor's the charging need not charge through underarm switch, can charge at the arbitrary time outside the on-time of upper arm switch. Even at the initial stage of starting the power converter, the bootstrap capacitor can be charged only by controlling the first switch to be conducted for a short time, so as to avoid the problem that the lower arm switch cannot provide enough conducting time in the original design of the power converter, or cannot provide enough conducting time when the power converter is operated in a discontinuous conducting mode, and cannot establish enough voltage on the bootstrap capacitor. In addition, because the first switch and the second switch are only used as conducting switches, no additional driver is needed, and therefore, the whole circuit structure of the bootstrap capacitor voltage stabilization auxiliary circuit is simple, the stability is high, and the whole cost is low.
The utility model also provides a power converter with bootstrap electric capacity steady voltage auxiliary circuit contains:
an upper arm switch and a lower arm switch connected in series between the first connection terminal and a ground terminal, a connection node being provided between the upper arm switch and the lower arm switch;
a first capacitor electrically connected between the first connection terminal and the grounding terminal;
an inductor electrically connected between the connection node and a second power supply terminal;
a second capacitor electrically connected between the second power terminal and the ground terminal; and
a bootstrap capacitor voltage stabilization auxiliary circuit, comprising:
a drive control module having a power supply terminal, an upper arm drive output terminal, a lower arm drive output terminal, a capacitor power supply terminal and a conduction control terminal; the power supply end is used for connecting an auxiliary power supply, the upper arm driving output end is electrically connected with a control end of the upper arm switch, the lower arm driving output end is electrically connected with a control end of the lower arm switch, and the capacitor power supply end is electrically connected with the power supply end;
a first switch electrically connected between the conduction control terminal and a grounding terminal;
a second switch electrically connected between the conduction control terminal of the driving control module and a connection node of the upper arm switch and the lower arm switch, and having a second control terminal electrically connected to the upper arm driving output terminal; and
a bootstrap capacitor electrically connected between the capacitor power supply terminal and the conduction control terminal; wherein the content of the first and second substances,
when the first switch is turned on, the auxiliary power supply charges the bootstrap capacitor through the capacitor power supply terminal;
when the drive control module makes the capacitor power supply end and the upper arm drive output end form conduction, the bootstrap capacitor discharges to the control ends of the upper arm switch and the second switch through the capacitor power supply end and the upper arm drive output end, the second switch forms conduction between the connection node and the conduction control end, and the upper arm switch is conducted.
The power converter with the bootstrap capacitor voltage-stabilizing auxiliary circuit is a non-isolated buck-boost power converter and a bidirectional power converter, the first connection end and the second power end can be respectively used as power input ends, the other end is a power output end, and the bootstrap capacitor voltage-stabilizing auxiliary circuit drives the upper arm switch and the lower arm switch therein. The utility model discloses a power converter with bootstrap electric capacity steady voltage auxiliary circuit's technical characterstic and efficiency are the same with aforementioned bootstrap electric capacity steady voltage auxiliary circuit.
The utility model discloses still provide another kind of power converter who has bootstrap capacitor voltage stabilization auxiliary circuit, contain:
an isolated transformer having a primary side coil and a secondary side coil;
a primary side circuit electrically connected to the primary side coil, comprising:
an upper arm switch and a lower arm switch connected in series between a power input terminal and a ground terminal, a connection node between the upper arm switch and the lower arm switch being connected to the primary side coil; and
a bootstrap capacitor voltage stabilization auxiliary circuit, comprising:
a drive control module having a power supply terminal, an upper arm drive output terminal, a lower arm drive output terminal, a capacitor power supply terminal and a conduction control terminal; the power supply end is used for connecting an auxiliary power supply, the upper arm driving output end is electrically connected with a control end of the upper arm switch, the lower arm driving output end is electrically connected with a control end of the lower arm switch, and the capacitor power supply end is electrically connected with the power supply end;
a first switch electrically connected between the conduction control terminal and the grounding terminal;
a second switch electrically connected between the conduction control terminal of the driving control module and the connection node and having a second control terminal electrically connected to the upper arm driving output terminal; and
a bootstrap capacitor electrically connected between the capacitor power supply terminal and the conduction control terminal; wherein the content of the first and second substances,
when the first switch is turned on, the auxiliary power supply charges the bootstrap capacitor through the capacitor power supply terminal;
when the drive control module makes the capacitor power supply end and the upper arm drive output end form conduction, the bootstrap capacitor discharges to the control ends of the upper arm switch and the second switch through the capacitor power supply end and the upper arm drive output end, the second switch forms conduction between the connection node and the conduction control end, and the upper arm switch is conducted.
The utility model discloses a this power converter with bootstrap electric capacity steady voltage auxiliary circuit is the buck-boost power converter of an isolated, and this upper arm switch and this time arm on-off control input are to the power of the side coil of isolated transformer, and this bootstrap electric capacity steady voltage auxiliary circuit then drives this upper arm switch and this underarm switch wherein. The utility model discloses a power converter with bootstrap electric capacity steady voltage auxiliary circuit's technical characterstic and efficiency are the same with aforementioned bootstrap electric capacity steady voltage auxiliary circuit.
Drawings
Fig. 1 is a schematic circuit diagram of a bootstrap capacitor voltage-stabilizing auxiliary circuit according to a first embodiment of the present invention.
Fig. 2 is a schematic circuit diagram of a preferred embodiment of the bootstrap capacitor voltage stabilization auxiliary circuit of the present invention.
Fig. 3A and 3B are schematic diagrams of a circuit operation of the bootstrap capacitor voltage stabilization auxiliary circuit of the present invention.
Fig. 4 is a circuit diagram of a power converter with a bootstrap capacitor voltage regulation auxiliary circuit according to a second embodiment of the present invention.
Fig. 5 is a circuit diagram of another power converter with bootstrap capacitor regulator auxiliary circuit according to a third embodiment of the present invention.
Fig. 6 is a circuit for driving a switch of a conventional power converter.
Detailed Description
Referring to fig. 1, the bootstrap capacitor C voltage stabilizing auxiliary circuit (hereinafter referred to as voltage stabilizing auxiliary circuit) of the power converter of the present invention is used to electrically connect an upper arm switch Qa and a lower arm switch Qb, the upper arm switch Qa and the lower arm switch Qb are connected in series between an input power Vin and a ground GND, and a connection node n1 is provided between the upper arm switch Qa and the lower arm switch Qb. Generally, the upper arm switch Qa and the lower arm switch Qb are N-channel metal oxide semiconductor field effect transistors (NMOS), respectively.
In a first embodiment of the present invention, the voltage stabilizing auxiliary circuit includes a driving control module 11, a first switch Q1, a second switch Q2 and a bootstrap capacitor C. The driving control module 11 has a power terminal VDD, an upper arm driving output terminal HO, a lower arm driving output terminal LO, a capacitor power terminal HB, and a conduction control terminal HS. The power terminal VDD is used to connect to an auxiliary power source V1, the upper arm driving output terminal HO is electrically connected to the control terminal of the upper arm switch Qa, the lower arm driving output terminal LO is electrically connected to the control terminal of the lower arm switch Qb, and the capacitor power supply terminal HB is electrically connected to the power terminal VDD. The first switch Q1 is electrically connected between the conducting control terminal HS and a ground terminal GND, the second switch Q2 is electrically connected between the conducting control terminal HS of the driving control module 11 and a connection node n1 of the upper arm switch Qa and the lower arm switch Qb, and has a second control terminal g2, and the second control terminal g2 is electrically connected to the upper arm driving output terminal HO. The bootstrap capacitor C is electrically connected between the capacitor power supply terminal HB and the conduction control terminal HS. Preferably, the first switch Q1 and the second switch Q2 are N-channel metal oxide semiconductor field effect transistors (NMOS), respectively.
Preferably, the voltage stabilizing auxiliary circuit further includes a bootstrap control unit 12 electrically connected to a first control terminal g1 of the first switch Q1, for outputting a control signal to the first control terminal g1 of the first switch Q1, and controlling the first switch Q1 to be turned on during a period in which the driving control module 11 outputs a non-conducting signal from the upper arm driving output terminal HO. When the first switch Q1 is turned on, the auxiliary power supply V1 forms a charging loop of the bootstrap capacitor C through the power end VDD of the driving control module 11, the capacitor power supply end HB, the bootstrap capacitor C, the first switch Q1 to the ground end GND, and charges the bootstrap capacitor C to establish a voltage difference across the bootstrap capacitor C. The bootstrap control unit 12 is, for example, electrically connected to the driving control module 11, or integrally disposed in the driving control module 11, so as to obtain a time interval during which the upper arm driving output terminal HO outputs the non-conducting signal of the driving control module 11. The bootstrap control unit 12 is, for example, a digital control circuit or an analog control circuit composed of a plurality of logic gates.
Referring to fig. 2, in a preferred embodiment, the auxiliary voltage stabilizing circuit further includes a pwm unit 13 electrically connected to the driving control module 11. The pwm unit 13 generates an upper arm control signal and a lower arm control signal, so that the driving control module 11 controls the output signals of the upper arm driving output terminal HO and the lower arm driving output terminal LO accordingly. The upper arm control signal and the lower arm control signal have a conducting period and a non-conducting period respectively, so that the driving control module 11 controls the upper arm driving output terminal HO and the lower arm driving output terminal LO to output a conducting signal or a non-conducting signal respectively. It should be noted that the method for determining the upper arm control signal and the lower arm control signal by the pwm unit 13 is determined according to the design of the power converter applied by the auxiliary voltage stabilizing circuit, and may be operated in a continuous conduction mode or a discontinuous conduction mode, or any known pwm technology may be used.
Preferably, the driving control module 11 includes a diode D, an upper arm driver 111, a lower arm driver 112 and a controller 113. The diode D is electrically connected between the power source terminal VDD and the capacitor power supply terminal HB to determine a current direction from the power source terminal VDD to the capacitor power supply terminal HB. The upper arm driver 111 is electrically connected between the controller 113, the capacitor power supply terminal HB, the upper arm driving output terminal HO and the conduction control terminal HS, and the lower arm driver 112 is electrically connected between the controller 113 and the lower arm driving output terminal LO. The controller 113 is electrically connected to the pwm unit 12 through an upper arm control input HI and a lower arm control input LI, for example, and receives the upper arm control signal and the lower arm control signal to control the upper arm driver 111 according to the upper arm control signal and control the lower arm driver 112 according to the lower arm control signal. In one embodiment, the driving control module 11 is disposed in a chip package.
More specifically, when the upper arm control signal is a turn-on control signal, the controller 113 controls the upper arm driver 111 to turn on between the capacitor supply terminal HB and the upper arm drive output terminal HO, and the upper arm switch Qa is in a turn-on period.
When the upper arm control signal is a non-conducting control signal, the controller 113 controls the upper arm driver 111 to be open between the capacitive power supply terminal HB and the upper arm drive output terminal HO, and the upper arm switch Qa is in a non-conducting period.
When the lower arm control signal is an on control signal, the controller 113 controls the lower arm driver 112 to output an on signal from the lower arm driving output terminal LO, so that the lower arm switch Qb is turned on, and the lower arm switch Qb is turned on during the on period.
Referring to fig. 3A, during any non-conducting period of the upper arm switch Qa, the bootstrap control unit 12 can control the first switch Q1 to be conducted, so as to charge the bootstrap capacitor C. When the bootstrap control unit 12 outputs a conducting signal to the first control terminal g1 of the first switch Q1, the first switch Q1 is turned on, a charging loop is formed by the auxiliary power supply V1, the power terminal VDD, the capacitor power supply terminal HB, the bootstrap capacitor C, the first switch Q1 and the ground terminal GND, and the auxiliary power supply V1 charges the bootstrap capacitor C.
Referring to fig. 3B, during the on period of the upper arm switch Qa, the driving control module 11 makes the capacitor power supply terminal HB and the upper arm driving output terminal HO turned on, the bootstrap capacitor C is discharged from the capacitor power supply terminal HB and the upper arm driving output terminal HO to the first control terminal g1 of the upper arm switch Qa and the second control terminal g2 of the second switch Q2, so that the second switch Q2 is turned on, and a connection is formed between the connection node n1 and the conducting control terminal HS, the control terminal ga of the upper arm switch Qa receives the voltage provided by the bootstrap capacitor C, and the upper arm switch Qa is turned on.
The bootstrap capacitor voltage-stabilizing auxiliary circuit can be commonly used in any power converter applying an up-down switch, such as a non-isolated power converter or an isolated-chamber power converter. The following are given as examples.
Referring to fig. 4, in a second embodiment of the present invention, a power converter with a bootstrap capacitor voltage stabilization auxiliary circuit includes the upper arm switch Qa and the lower arm switch Qb, a first capacitor C1, an inductor L, a second capacitor C2 and the voltage stabilization auxiliary circuit of the first embodiment. The upper arm switch Qa and the lower arm switch Qb are connected in series between the first connection terminal I/O1 and a ground terminal GND, and the connection node n1 is provided between the upper arm switch Qa and the lower arm switch Qb. The first capacitor C1 is electrically connected between the first connection terminal I/O1 and the ground terminal GND, the inductor L is electrically connected between the connection node n1 and a second connection terminal I/O2, and the second capacitor C2 is electrically connected between the second connection terminal I/O2 and the ground terminal GND.
The auxiliary voltage stabilizing circuit, consistent with the first embodiment, is connected to the upper arm switch Qa and the lower arm switch Qb to drive the upper arm switch Qa and the lower arm switch Qb to be turned on. The power Converter in this embodiment is, for example, a Buck-boost Converter (Buck-boost Converter) with half-bridge rectification, and can set the first connection terminal I/O1 or the second connection terminal I/O2 as a power input terminal, and set the opposite end as a power output terminal, and control the auxiliary voltage stabilizing circuit to drive the upper arm switch Qa and the lower arm switch Qb and control the respective conduction intervals through the upper arm control signal and the lower arm control signal generated by the pwm unit 13. The detailed structure and operation of the auxiliary voltage stabilizing circuit are the same as those of the first embodiment, and therefore, the detailed description thereof is omitted.
Referring to fig. 5, in a third embodiment of the present invention, a power converter with a bootstrap capacitor voltage stabilization auxiliary circuit includes an isolation transformer T and a primary side circuit 10. The isolated transformer T has a primary winding L1 and a secondary winding L2, the primary circuit 10 is electrically connected to the primary winding L1, and includes an upper arm switch Qa and a lower arm switch Qb, and the voltage stabilizing auxiliary circuit in the first embodiment. The upper arm switch Qa and the lower arm switch Qb are connected in series between a power input terminal Vin and a ground terminal GND, and a connection node n1 between the upper arm switch Qa and the lower arm switch Qb is connected to the primary coil L1.
The auxiliary voltage stabilizing circuit, consistent with the first embodiment, is connected to the upper arm switch Qa and the lower arm switch Qb to drive the upper arm switch Qa and the lower arm switch Qb to be turned on, so that the upper arm switch Qa and the lower arm switch Qb control the power supplied from the power output terminal to the primary winding L1. The detailed structure and operation of the auxiliary voltage stabilizing circuit are as described in the first embodiment, and therefore are not repeated herein.
To sum up, the utility model discloses a power converter's capacitor voltage stabilization auxiliary circuit of lifting is because circuit structure is simple, and operation elasticity is big. The bootstrap capacitor charging circuit can be used in a full-bridge or half-bridge rectification circuit regardless of an isolated or non-isolated power converter, is suitable for driving any auxiliary circuit of an upper arm switch which needs a bootstrap capacitor to provide driving voltage, and solves the problems that the bootstrap capacitor in the existing switch driving circuit is difficult to charge and easy to drop voltage, or the bootstrap capacitor charging circuit is complex.
The above embodiments are only examples of the present invention, and are not intended to limit the present invention in any way, and although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any person skilled in the art can make modifications or changes equivalent to the above embodiments without departing from the scope of the present invention, but all the modifications, changes and modifications of the above embodiments that are simple and do not depart from the technical scope of the present invention are within the scope of the present invention.
Claims (9)
1. A bootstrap capacitor voltage stabilization auxiliary circuit, which is electrically connected to an upper arm switch and a lower arm switch, comprises:
a drive control module having a power supply terminal, an upper arm drive output terminal, a lower arm drive output terminal, a capacitor power supply terminal and a conduction control terminal; the power supply end is used for being connected with an auxiliary power supply, the upper arm driving output end is electrically connected with a control end of the upper arm switch, the lower arm driving output end is electrically connected with a control end of the lower arm switch, and the capacitor power supply end is electrically connected with the power supply end;
a first switch electrically connected between the conduction control terminal and a grounding terminal;
a second switch electrically connected between the conduction control terminal of the driving control module and a connection node of the upper arm switch and the lower arm switch, and having a second control terminal electrically connected to the upper arm driving output terminal; and
a bootstrap capacitor electrically connected between the capacitor power supply terminal and the conduction control terminal; wherein the content of the first and second substances,
when the first switch is turned on, the auxiliary power supply charges the bootstrap capacitor through the capacitor power supply terminal;
when the drive control module makes the capacitor power supply end and the upper arm drive output end form conduction, the bootstrap capacitor discharges to the control ends of the upper arm switch and the second switch through the capacitor power supply end and the upper arm drive output end, the second switch forms conduction between the connection node and the conduction control end, and the upper arm switch is conducted.
2. The bootstrap capacitor voltage stabilization assist circuit of claim 1, further comprising:
and a bootstrap control unit electrically connected to a first control terminal of the first switch for controlling the first switch to be turned on during a period in which the drive control module outputs a non-conductive signal from the upper arm drive output terminal.
3. The bootstrap capacitor voltage stabilization auxiliary circuit of claim 2, wherein the bootstrap control unit is integrally disposed in the driving control module.
4. The bootstrap capacitor voltage stabilization auxiliary circuit of claim 1, wherein the driving control module is disposed in a chip package.
5. The bootstrap capacitor voltage stabilization auxiliary circuit of claim 1, wherein the driving control module comprises:
and a diode electrically connected between the power supply terminal and the capacitor power supply terminal.
6. The bootstrap capacitor voltage stabilization auxiliary circuit of claim 1, wherein the first switch and the second switch are N-channel metal oxide semiconductor field effect transistors NMOS.
7. The bootstrap capacitor voltage stabilization auxiliary circuit of claim 1, further comprising:
a pulse width modulation unit electrically connected with the drive control module; the PWM unit generates an upper arm control signal and a lower arm control signal and outputs the upper arm control signal and the lower arm control signal to the driving control module.
8. A power converter having a bootstrap capacitor voltage regulation assist circuit, comprising:
an upper arm switch and a lower arm switch connected in series between the first connection terminal and a ground terminal, a connection node being provided between the upper arm switch and the lower arm switch;
a first capacitor electrically connected between the first connection terminal and the grounding terminal;
an inductor electrically connected between the connection node and a second power supply terminal;
a second capacitor electrically connected between the second power terminal and the ground terminal; and
a bootstrap capacitor voltage regulation auxiliary circuit, comprising:
a drive control module having a power supply terminal, an upper arm drive output terminal, a lower arm drive output terminal, a capacitor power supply terminal and a conduction control terminal; the power supply end is used for connecting an auxiliary power supply, the upper arm driving output end is electrically connected with a control end of the upper arm switch, the lower arm driving output end is electrically connected with a control end of the lower arm switch, and the capacitor power supply end is electrically connected with the power supply end;
a first switch electrically connected between the conduction control terminal and a grounding terminal;
a second switch electrically connected between the conduction control terminal of the driving control module and a connection node of the upper arm switch and the lower arm switch, and having a second control terminal electrically connected to the upper arm driving output terminal; and
a bootstrap capacitor electrically connected between the capacitor power supply terminal and the conduction control terminal; wherein, the first and the second end of the pipe are connected with each other,
when the first switch is turned on, the auxiliary power supply charges the bootstrap capacitor through the capacitor power supply terminal;
when the drive control module makes the capacitor power supply end and the upper arm drive output end form conduction, the bootstrap capacitor discharges to the control ends of the upper arm switch and the second switch through the capacitor power supply end and the upper arm drive output end, the second switch forms conduction between the connection node and the conduction control end, and the upper arm switch is conducted.
9. A power converter having a bootstrap capacitor voltage stabilization auxiliary circuit, comprising:
an isolated transformer having a primary side coil and a secondary side coil;
a primary side circuit electrically connected to the primary side coil, comprising:
an upper arm switch and a lower arm switch connected in series between a power input terminal and a ground terminal, a connection node between the upper arm switch and the lower arm switch being connected to the primary side coil; and
a bootstrap capacitor voltage regulation auxiliary circuit, comprising:
a drive control module having a power supply terminal, an upper arm drive output terminal, a lower arm drive output terminal, a capacitor power supply terminal and a conduction control terminal; the power supply end is used for being connected with an auxiliary power supply, the upper arm driving output end is electrically connected with a control end of the upper arm switch, the lower arm driving output end is electrically connected with a control end of the lower arm switch, and the capacitor power supply end is electrically connected with the power supply end;
a first switch electrically connected between the conduction control terminal and the grounding terminal;
a second switch electrically connected between the conduction control terminal of the driving control module and the connection node and having a second control terminal electrically connected to the upper arm driving output terminal; and
a bootstrap capacitor electrically connected between the capacitor power supply terminal and the conduction control terminal; wherein, the first and the second end of the pipe are connected with each other,
when the first switch is turned on, the auxiliary power supply charges the bootstrap capacitor through the capacitor power supply terminal;
when the drive control module makes the capacitor power supply end and the upper arm drive output end form conduction, the bootstrap capacitor discharges to the control ends of the upper arm switch and the second switch through the capacitor power supply end and the upper arm drive output end, the second switch forms conduction between the connection node and the conduction control end, and the upper arm switch is conducted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222372786.2U CN218514276U (en) | 2022-09-07 | 2022-09-07 | Bootstrap capacitor voltage-stabilizing auxiliary circuit and power converter with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222372786.2U CN218514276U (en) | 2022-09-07 | 2022-09-07 | Bootstrap capacitor voltage-stabilizing auxiliary circuit and power converter with same |
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| Publication Number | Publication Date |
|---|---|
| CN218514276U true CN218514276U (en) | 2023-02-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222372786.2U Active CN218514276U (en) | 2022-09-07 | 2022-09-07 | Bootstrap capacitor voltage-stabilizing auxiliary circuit and power converter with same |
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| Country | Link |
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| CN (1) | CN218514276U (en) |
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2022
- 2022-09-07 CN CN202222372786.2U patent/CN218514276U/en active Active
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