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CN116647130B - Auxiliary source power supply circuit and system of bidirectional isolation converter - Google Patents

Auxiliary source power supply circuit and system of bidirectional isolation converter Download PDF

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Publication number
CN116647130B
CN116647130B CN202310890683.1A CN202310890683A CN116647130B CN 116647130 B CN116647130 B CN 116647130B CN 202310890683 A CN202310890683 A CN 202310890683A CN 116647130 B CN116647130 B CN 116647130B
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Prior art keywords
bat
bus
auxiliary source
mcu
triode
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CN202310890683.1A
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Chinese (zh)
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CN116647130A (en
Inventor
陈德伟
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Shenzhen Geruide Electric Co ltd
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Shenzhen Geruide Electric Co ltd
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Classifications

    • 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
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
    • H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
    • H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
    • H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • H02M3/33584—Bidirectional converters
    • 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
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • 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
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
    • H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
    • H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
    • H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33573—Full-bridge at primary side of an isolation transformer
    • 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
    • H02M5/00—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC
    • H02M5/04—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by static converters
    • H02M5/10—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by static converters using transformers
    • 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
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
    • H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
    • H02M7/12—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/217—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M7/219—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
    • 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
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
    • H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
    • H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration

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

Abstract

The invention provides an auxiliary source power supply circuit and a system of a bidirectional isolation converter, wherein the circuit comprises a BAT side auxiliary source, a BUS side auxiliary source and an isolation driving circuit; the BAT side auxiliary source is positioned on the BAT side; the BUS side auxiliary source is positioned on the BUS side; the BAT side auxiliary source is communicated with the BUS side auxiliary source through the isolation driving circuit, so that when the BAT side or the BUS side is unpowered, the isolation driving circuit controls the other side auxiliary source to drive the unpowered auxiliary source. The invention can ensure that the independent auxiliary sources at two sides can still work normally under the condition of no electricity at any side, and has the advantages of simplified insulation design, low cost, easy realization, high reliability, easy circuit thermal design, improved overall efficiency and the like.

Description

Auxiliary source power supply circuit and system of bidirectional isolation converter
Technical Field
The invention relates to the technical field of isolation converters, in particular to an auxiliary source power supply circuit and an auxiliary source power supply system of a bidirectional isolation converter.
Background
The circuits on both sides of the isolation transformer inside the bidirectional isolation transformer must meet the requirement of enhanced insulation. In the following, a bi-directional isolated DC-DC converter (topology of a full bridge LLC) is illustrated as shown in fig. 1, if the left side is a battery input and the right side is a DC bus input (and vice versa). In order to meet the isolation requirement of the reinforced insulation of the two sides, besides ensuring that the internal isolation transformer T1 meets the safety rule of the reinforced insulation, the driving, sampling and auxiliary power supply of the control circuit of the power tubes at the two sides are ensured to also strictly meet the reinforced insulation. The invention relates to innovation aiming at isolation design of an auxiliary source power supply part.
The auxiliary source power supply schemes of the existing bidirectional isolation converters are generally divided into two categories: one is that two isolated sides are respectively controlled by two independent MCUs, namely a double MCU scheme; the other type is that two sides of the isolation share one MCU control, namely a single MCU scheme. The following will be described separately:
(1) Auxiliary source power supply scheme controlled by double MCU
As shown in FIG. 2, the bidirectional isolation converter is independently controlled by the BAT-MCU and the BUS-MCU respectively, and data information is interacted between the two MCU through an isolation communication chip ISO IC. Two independent auxiliary sources BAT-AUX-POWER and BUS-AUX-POWER are respectively established at two sides of the isolation, as shown in a solid line block diagram of fig. 2, wherein the BAT-AUX-POWER only takes electricity from a BAT end and only provides control POWER supply for a control circuit (driving, sampling, control circuit BAT-MCU POWER supply and the like) at the BAT side, but does not provide control POWER to the BUS side; similarly, BUS-AUX-POWER takes POWER only from the BUS side and also provides control POWER only to the control circuitry on the BUS side, but does not provide control POWER to the BAT side. The output control power utilization of the two auxiliary sources is mutually independent and self-sufficient, the uncontrolled power source spans the isolation belt, and the safety insulation structure is simple, so that the scheme has the greatest advantage.
However, when only one side is electrified, if the BAT side is electrified and the BUS side is not electrified, the BAT-MCU is electrified and initialized to work Q1, Q2, Q3 and Q4, then the output voltage of the BUS side is built after the internal diodes of Q5, Q6, Q7 and Q8 are rectified, and then the BUS-AUX-POWER is started, so that the BUS-MCU starts to work normally. In short, when only one side has electricity, the scheme indirectly starts the auxiliary source at the other side after power conversion, and the biggest defect is that once a power device is damaged, the auxiliary source at the passive side cannot be normally started and the MCU works through power conversion, and the corresponding fault cannot be reported.
(2) Single MCU controlled auxiliary source power supply scheme
As shown in fig. 3, if the entire converter is uniformly controlled by only one MCU, and the MCU is placed on the BUS side. As shown in the solid line block diagram of FIG. 3, BAT-AUX-POWER only takes POWER from the battery, while BUS-AUX-POWER takes POWER not only from BUS input but also from BAT-AUX-POWER output. The purpose of this is to enable the BUS-AUX-POWER by its output when there is no input source on the BUS side, thereby enabling the BUS-MCU to operate and finally the entire converter to operate.
The proposal has the advantage that the MCU can be directly started as long as one side has an input source. However, compared with the scheme (1), the scheme has the defect that one auxiliary source spans the isolation belt and needs to meet the requirement of reinforcing insulation, and naturally, the safety insulation design cost is increased. In addition, the BAT-AUX-POWER is required to provide an auxiliary source for starting the BUS side by a POWER supply and to meet the control POWER consumption of the BAT-AUX-POWER, so that the problem of multi-winding output load cross adjustment rate is unavoidable. If MCU is on BAT side, then it is BAT-AUX-POWER that gets POWER from BAT input and BUS-AUX-POWER output two paths source altogether. Similar to the above, no details are necessary here.
(3) Single MCU control or double MCU control universal auxiliary source power supply method
As shown in fig. 4, the control POWER output by the BUS-AUX-POWER is supplied to the BAT side as well as the BUS side; similarly, the control POWER of the BAT-AUX-POWER output is supplied to the BAT side and the BUS side. That is, as long as there is electricity on either side, the control electricity on both sides of the isolation can be established.
The scheme has the advantages that the control electricity consumption at two sides is redundant backup, and the reliability is high; the disadvantage is that both auxiliary sources span the isolation belt, both must meet the requirement of reinforcing insulation, and the cost of safety insulation design is very high. A more fatal disadvantage is that this scheme also suffers from the problem of multi-winding output on-load cross-regulation.
Two sources of flyback (but not limited to flyback) are further described below. As shown in fig. 5 and 6, the circuit diagrams of the BAT-AUX-POWER, i.e., BAT-side auxiliary source, and the BUS-AUX-POWER, i.e., BUS-side auxiliary source, respectively, in this scheme are shown. It can be seen that BAT-AUX-POWER has both VCC_FOR_BAT (control POWER on BAT side) and VCC_FOR_BUS (control POWER on BUS side). Likewise, BUS-AUX-POWER has both VCC_FOR_BUS and VCC_FOR_BAT. As shown in fig. 6, when the maximum output power of the two windings is relatively large, once the closed-loop winding vcc_for_bat is lightly loaded but the non-closed-loop control winding vcc_for_bus is suddenly loaded, the output voltage of the non-closed-loop control winding vcc_for_bus is easily severely dropped due to leakage inductance of the transformer, and some working conditions even cannot work normally at all.
Aiming at the defects, the invention provides an auxiliary source power supply circuit and an auxiliary source power supply system of a bidirectional isolation converter, so as to realize the aim that two independent auxiliary sources can work normally as long as any side is electrified.
Disclosure of Invention
The present invention aims to solve at least to some extent one of the technical problems in the above-described technology. Therefore, the invention aims to provide an auxiliary source power supply circuit and an auxiliary source power supply system of a bidirectional isolation converter, which can realize that independent auxiliary sources on two sides can work normally when any side is electrified, and have the advantages of easiness in implementation, low cost, high reliability and the like.
In order to achieve the above objective, an embodiment of a first aspect of the present invention provides an auxiliary power supply circuit of a bidirectional isolation converter, including a BAT side auxiliary source, a BUS side auxiliary source, and an isolation driving circuit; the BAT side auxiliary source is positioned on the BAT side; the BUS side auxiliary source is positioned on the BUS side; the BAT side auxiliary source is communicated with the BUS side auxiliary source through the isolation driving circuit, so that when the BAT side or the BUS side is unpowered, the isolation driving circuit controls the other side auxiliary source to drive the unpowered side auxiliary source.
According to the auxiliary source power supply circuit provided by the embodiment of the invention, mutually independent auxiliary sources are respectively established at the two sides of the isolation belt, and are mutually communicated through the isolation driving circuit capable of controlling the excitation direction, so that the independent auxiliary sources at the two sides can still ensure normal work under the condition that any side is not powered. Because the independent auxiliary sources at the two sides are not directly communicated and do not span the isolation belt, reinforced insulation is not needed, and thus, the insulation design is simplified, the cost is low, and the implementation is easy.
In addition, the auxiliary source power supply circuit of the bidirectional isolation converter provided by the embodiment of the invention can also have the following additional technical characteristics:
optionally, the auxiliary source power supply circuit further comprises an isolation transformer; the isolation driving circuit comprises a BAT side driving module and a BUS side driving module; the isolation transformer comprises a winding N1 and a winding N2 which are positioned on the BAT side, and a winding N3 and a winding N4 which are positioned on the BUS side; the winding N1 is connected with the BAT side auxiliary source through the BAT side driving module, and the winding N3 is connected with the BUS side auxiliary source; the winding N4 is connected with the BUS side auxiliary source through the BUS side driving module, and the winding N2 is connected with the BAT side auxiliary source.
Optionally, the BAT side driving module is a BAT side driving chip or a BAT side driving circuit; the BUS side driving module is a BUS side driving chip or a BUS side driving circuit.
Optionally, the device also comprises a BAT side MCU, a BUS side MCU and an isolation chip; the BAT side MCU is respectively connected with the BAT side auxiliary source and the isolation chip; and the BUS side MCU is respectively connected with the BUS side auxiliary source and the isolation chip.
Optionally, the BAT side driving module includes a controllable MOS transistor Q1, a triode Q3, and a triode Q4; the BUS side driving module comprises a controllable MOS tube Q2, a triode Q5 and a triode Q6;
the head end of the winding N1 is connected with the BAT side auxiliary source, the tail end of the winding N1 is connected with the controllable MOS tube Q1 and the triode Q3 in sequence, and the triode Q3 is also connected with the BAT side auxiliary source and the BAT side MCU through the triode Q4 respectively; the head end of the winding N4 is connected with the BUS side auxiliary source, the tail end of the winding N4 is connected with the controllable MOS tube Q2 and the triode Q5 in sequence, and the triode Q5 is also connected with the BUS side auxiliary source and the BUS side MCU through the triode Q6 respectively.
Optionally, the device further comprises a BAT sampling module, a BAT driving module, a BUS sampling module and a BUS driving module; the BAT sampling module is respectively connected with the BAT side auxiliary source and the BAT side MCU; the BAT driving module is respectively connected with the BAT side auxiliary source and the BAT side MCU; the BUS sampling module is respectively connected with the BUS side auxiliary source and the BUS side MCU; and the BUS driving module is respectively connected with the BUS side auxiliary source and the BUS side MCU.
Optionally, the device further comprises an isolation chip and a BAT side MCU or a BUS side MCU connected with the isolation chip;
if the BAT side MCU is included, the BAT side MCU is also connected with the BAT side auxiliary source;
and if the BUS side MCU is included, the BUS side MCU is also connected with the BUS side auxiliary source.
Optionally, the BAT side driving module includes a controllable MOS transistor Q1, a triode Q3, and a triode Q4; the BUS side driving module comprises a controllable MOS tube Q2, a triode Q5 and a triode Q6;
the head end of the winding N1 is connected with the BAT side auxiliary source, the tail end of the winding N1 is connected with the controllable MOS tube Q1, and then is respectively connected with the BAT side auxiliary source and the triode Q4 through the triode Q3; the winding N2 is connected with the BUS side auxiliary source; the head end of the winding N4 is connected with the BUS side auxiliary source, the tail end of the winding N4 is connected with the controllable MOS tube Q2, and then is connected with the BUS side auxiliary source and the triode Q6 respectively through the triode Q5; the winding N2 is connected with the BAT side auxiliary source;
if the BAT side MCU is included, the BUS side driving circuit further comprises a triode Q7; the triode Q6 is connected with the BAT side MCU through the triode Q7; the triode Q4 is connected with the BAT side MCU;
if the BUS side MCU is included, the BAT side driving circuit further comprises a triode Q7; the triode Q4 is connected with the BUS side MCU through the triode Q7; and the triode Q6 is connected with the BUS side MCU.
Optionally, the device further comprises a BAT sampling module, a BAT driving module, a BUS sampling module and a BUS driving module; the BAT sampling module and the BAT driving module are respectively connected with the BAT side auxiliary source; the BUS sampling module and the BUS driving module are respectively connected with the BUS side auxiliary source;
if the BAT side MCU is included, the BAT sampling module and the BAT driving module are respectively connected with the BAT side MCU; the BUS sampling module and the BUS driving module are respectively connected with the isolation chip;
if the BUS side MCU is included, the BUS sampling module and the BUS driving module are respectively connected with the BUS side MCU; and the BAT sampling module and the BAT driving module are respectively connected with the isolation chip.
In order to achieve the above objective, a second embodiment of the present invention provides an auxiliary power supply system of a bidirectional isolation converter, which includes an auxiliary power supply circuit of the bidirectional isolation converter.
Drawings
FIG. 1 is a schematic diagram of a prior art bi-directional isolated DC-DC converter;
FIG. 2 is a system block diagram of a dual MCU controlled auxiliary power scheme in the prior art;
FIG. 3 is a system block diagram of a single MCU controlled auxiliary power supply scheme in the prior art;
FIG. 4 is a system block diagram of a prior art single MCU control or dual MCU control universal auxiliary power supply scheme;
FIG. 5 is a schematic diagram of a circuit configuration of the BAT side auxiliary source in the system of FIG. 4;
FIG. 6 is a schematic diagram of a circuit configuration of a BUS side auxiliary source in the system of FIG. 4;
FIG. 7 is a simplified schematic diagram of an auxiliary power circuit of a bidirectional isolation converter according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of an isolation driving circuit in an auxiliary power supply circuit according to an embodiment of the present invention;
FIG. 9 is a block diagram of an auxiliary power supply circuit applied to dual MCU control according to an embodiment of the present invention;
FIG. 10 is a schematic diagram of a circuit structure of the BAT side auxiliary source and the BUS side auxiliary source according to an embodiment of the present invention;
FIG. 11 is a schematic circuit diagram of an isolated driving circuit according to an embodiment of the invention;
fig. 12 is a schematic circuit diagram of an isolated driving circuit when the auxiliary source power supply circuit is applied to single MCU control according to an embodiment of the present invention.
Description of the embodiments
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
The auxiliary source power supply design of the bidirectional isolation converter is different from the auxiliary source power supply design of the bidirectional isolation converter in the prior art, which is high in cost due to the need of reinforcing an insulation design, or low in reliability due to the fact that the problem of multi-winding output load cross adjustment rate exists; according to the invention, the independent auxiliary sources are respectively established at the two sides of the isolation belt, and are mutually communicated through the isolation driving circuit capable of controlling the excitation direction, so that the independent auxiliary sources at the two sides can still ensure normal work under the condition that any side is not powered. Because the independent auxiliary sources at the two sides are not directly communicated and do not span the isolation belt, reinforced insulation is not needed, so that the insulation design is simplified, the cost is low, and the implementation is easy; in addition, the invention has no risk of multi-winding output cross adjustment rate and high reliability.
In order that the above-described aspects may be better understood, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
In order to better understand the above technical solutions, the following detailed description will refer to the accompanying drawings and specific embodiments.
Fig. 7 is a simplified schematic diagram of an auxiliary power supply circuit of a bidirectional isolation converter according to an embodiment of the present invention. As shown in fig. 7, an embodiment of the present invention provides an auxiliary power supply circuit of a bidirectional isolation converter, which includes a BAT side auxiliary source 2, a BUS side auxiliary source 3, and an isolation driving circuit 4; the BAT side auxiliary source 2 is positioned on the BAT side; the BUS side auxiliary source 3 is positioned on the BUS side; the BAT side auxiliary source 2 and the BUS side auxiliary source 3 are communicated through the isolation driving circuit 4, so that when the BAT side or the BUS side is powered off, the isolation driving circuit 4 controls the power-on side auxiliary source to drive the power-off side auxiliary source.
In this embodiment, the BAT side corresponds to a battery input side; the BUS side corresponds to the direct current BUS input side; the BAT side and the BUS side are respectively positioned at two sides of the isolation transformer in the bidirectional isolation converter. The BAT side auxiliary source is established on the BAT side and daily power is taken from the BAT end and used for providing auxiliary power for a control circuit of the BAT side; the BUS side auxiliary source is established at the BUS side and daily electricity is taken from the BUS end and used for providing auxiliary power for a control circuit of the BUS side. And the isolation driving circuit is used for controlling the auxiliary source on the other side with electricity to supply power to the side without electricity so as to drive the auxiliary source when the BAT side or the BUS side is detected to be unpowered, so that the auxiliary sources on the two sides can work normally.
In this embodiment, the BAT side auxiliary source and the BUS side auxiliary source are independent of each other and do not cross the isolation belt, and are not directly communicated. Therefore, the BAT side auxiliary source and the BUS side auxiliary source only need to be designed according to functional insulation, and the reinforced insulation requirement does not need to be met, so that the insulation design can be simplified, and the BUS side auxiliary source has the characteristic of low design cost.
Fig. 8 is a schematic diagram of an isolation driving circuit in an auxiliary power supply circuit according to an embodiment of the present invention. This embodiment will be described on the basis of the embodiment of fig. 7, in which the implementation of the isolation driving circuit is developed. The structure of the isolation driving circuit is described below in connection with one embodiment.
As shown in fig. 8, the auxiliary power supply circuit further comprises an isolation transformer 1; the isolation transformer 1 comprises a winding N1 and a winding N2 which are positioned on the BAT side, and also comprises a winding N3 and a winding N4 which are positioned on the BUS side; the isolation driving circuit 4 includes a BAT side driving module 41 and a BUS side driving module 42; the winding N1 is connected with the BAT side auxiliary source 2 through the BAT side driving module 41, and the winding N3 is connected with the BUS side auxiliary source 3; the winding N4 is connected to the BUS side auxiliary source 3 via the BUS side driving module 42, and the winding N2 is connected to the BAT side auxiliary source 2.
Wherein the isolation transformer 1 spans an isolation strip to perform an insulating isolation function between the BAT side and the BUS side. The BAT side driving module 41 is used for controlling the on of the module when the BUS side is unpowered and the BAT side is powered on, so that the BAT side auxiliary source excites the winding N1, and can supply power to the BUS side through the winding N3 to drive the BUS side auxiliary source to work. Similarly, the BUS side driving module 42 is configured to control the on of the module when the BAT side is unpowered and the BUS side is powered on, so that the BUS side auxiliary source excites the winding N4, and can supply power to the BAT side through the winding N2 to drive the BAT side auxiliary source to operate.
It will be appreciated that the specific structure of the BAT side driving module and the BUS side driving module in this embodiment may be implemented in various manners, which is not limited herein. Optionally, at least two implementations are provided:
the realization mode is that the BAT side driving circuit and the BUS side driving circuit are manufactured in a pure hardware form, and the required functions are realized by the composition of hardware components such as MOS (metal oxide semiconductor) tubes, a plurality of diodes, triodes and the like.
Another implementation is to make the chip form of the BAT side driver chip and the BUS side driver chip to realize the required functions.
In the two implementations, the former has lower cost than the latter, and is easier to realize without isolation design, preferably the former is adopted.
In addition, in the present embodiment, the start timing of the BAT side driving module and the BUS side driving module in the isolation driving circuit may also have various implementations, which are not limited herein. Optionally, at least two implementations are provided:
the implementation mode is that the starting is performed through a control signal of the MCU module, namely, the MCU module issues a command to control the starting time of the BAT side driving module and the BUS side driving module.
In another implementation manner, the detection circuit and the logic circuit are used together to control the starting time of the BAT side driving module and the BUS side driving module. The working principle of the mode is as follows: and detecting the voltages of the output ends of the BAT side auxiliary source and the BUS side auxiliary source in real time respectively, and when the voltage value of the output end of one side auxiliary source is lower than a preset threshold value, namely under-voltage, controlling the driving module on the other side to be conducted through a logic circuit so as to enable the auxiliary source on the corresponding side auxiliary source excitation non-electric side to be started.
The invention can be applied to an auxiliary source power supply scheme of double MCU control or single MCU control, namely, can be applied to any auxiliary source power supply scheme, realizes that independent auxiliary sources on two sides can work normally when no power is supplied to any side, and has the advantages of easiness in realization, low cost, high reliability and the like. In the following, a specific implementation in the dual MCU controlled auxiliary power supply scheme and the single MCU controlled auxiliary power supply scheme will be described by two embodiments, respectively. It should be noted that, the following two embodiments are both described by taking the two independent auxiliary sources as single-ended flyback as an example, but the invention is not limited to this, and the two embodiments may also be in topological structures such as double-tube forward excitation and double-tube flyback.
Referring to fig. 9, fig. 9 is a block diagram of an auxiliary power supply circuit applied to dual MCU control according to an embodiment of the present invention. As shown in fig. 9, the auxiliary power supply circuit applied to dual MCU control provided in this embodiment mainly further includes a BAT side MCU, a BUS side MCU, and an isolation chip ISO IC on the basis of the embodiment of fig. 7; the BAT side MCU is respectively connected with the BAT side auxiliary source and the isolation chip; and the BUS side MCU is respectively connected with the BUS side auxiliary source and the isolation chip.
Optionally, the system further comprises an existing BAT sampling module, a BAT driving module, a BUS sampling module and a BUS driving module; the BAT sampling module is respectively connected with the BAT side auxiliary source and the BAT side MCU; the BAT driving module is respectively connected with the BAT side auxiliary source and the BAT side MCU; the BUS sampling module is respectively connected with the BUS side auxiliary source and the BUS side MCU; and the BUS driving module is respectively connected with the BUS side auxiliary source and the BUS side MCU.
In this embodiment, the implementation of the BAT side driving module and the BUS side driving module by using a hardware circuit is described as an example. Referring to fig. 10 and 11, fig. 10 is a schematic circuit diagram of the BAT side auxiliary source and the BUS side auxiliary source according to an embodiment of the invention; fig. 11 is a schematic circuit diagram of an isolated driving circuit according to an embodiment of the invention.
As shown in fig. 10, the middle black dashed line represents the isolation transformer, and the isolation transformer is used as the reference, the circuit structure diagram of the BAT side auxiliary source is located on the left side of the figure, and the circuit and structure diagram of the BUS side auxiliary source is located on the right side of the figure. As can be seen from fig. 10, the control power of the closed loop output vcc_for_bat+ of the BAT side auxiliary source is provided only to the BAT side control and not to the BUS side; the control power of the closed loop output VCC_FOR_BUS+ of the auxiliary source on the BUS side is only provided FOR the control use on the BUS side and is not provided to the BAT side. That is, the two side auxiliary sources are independent of each other and are not directly communicated, and the two independent auxiliary sources only have one heavy-duty closed-loop output winding, so that the risk of multi-winding output cross adjustment rate is avoided, and the reliability is high.
As shown in fig. 11, the middle black dotted line in the drawing represents the isolation transformer, and the BAT side is located on the left side of the drawing and the BUS side is located on the right side of the drawing, with reference to the isolation transformer. It can be seen that the isolation driving circuit shown in fig. 11 spans the isolation strip, but meets the requirement of enhanced insulation. As can be seen from fig. 11, among the N1, N2, N3 and N4 4 windings of the isolation transformer, the winding N1 is connected TO the closed-loop winding v_bat_to_bus+ of the auxiliary source on the BAT side through the controllable MOS Q1 of the isolation driving circuit, and the winding N4 is connected TO the closed-loop winding v_bus_to_bat+ of the auxiliary source on the BUS side through the controllable MOS Q2 of the isolation driving circuit; and the output of the winding N3 is subjected to full-bridge rectification and then FROM_BAT+ is used as a second path of input source of the auxiliary source at the BUS side, and the output of the winding N2 is subjected to full-bridge rectification and then FROM_BUS+ is used as a second path of input source of the auxiliary source at the BAT side. It can be understood that the isolation driving circuit flexibly selects the transformer winding on the active side for excitation through the controllable MOS, but only allows unilateral excitation at the same time, and is realized by ensuring that Q1 and Q3 follow a strict complementary opening relationship.
As a specific implementation manner of this embodiment, as shown in fig. 11, the BAT side driving module includes a controllable MOS transistor Q1, a triode Q3, and a triode Q4; the BUS side driving module comprises a controllable MOS tube Q2, a triode Q5 and a triode Q6; the head end of a winding N1 in an isolation transformer of an auxiliary source power supply circuit is connected with the BAT side auxiliary source, the tail end of the winding N1 is connected with a controllable MOS tube Q1 and a triode Q3 of the BAT side driving module in sequence, and the triode Q3 is also connected with the BAT side auxiliary source and the BAT side MCU through a triode Q4 respectively; the head end of a winding N4 in the isolation transformer is connected with the BUS side auxiliary source, the tail end of the winding N4 is connected with a controllable MOS tube Q2 and a triode Q5 of the BUS side driving module in sequence, and the triode Q5 is also connected with the BUS side auxiliary source and connected with the BUS side MCU through a triode Q6 respectively.
The working principle of the auxiliary source power supply circuit applied to double MCU control in the embodiment is as follows:
when the power supply is started, if the input sources at the two sides are normal, the auxiliary sources at the two sides are started in a row, and the MCU at the two sides can also normally supply power to work. At the moment, an isolation driving circuit is not required to work, so that the low level of the control_IO_BUS is maintained, the triode Q4 is cut off, the triode Q3 is also cut off, the MOS Q1 is cut off, and the winding N1 cannot be excited; at the same time, control_io_bat is low, and winding N4 is not excited, i.e., the isolation circuit is not operating at all.
When the device is started, if only one side is electrified, the device is under the working condition that the BAT port is electrified and the BUS port is unpowered. Since the BAT port is electrified, the BAT side auxiliary source can be automatically and normally started, after the BAT-MCU is electrified and initialized, after the BUS port is confirmed TO be unpowered according TO the criteria such as communication abnormality, the BAT-MCU issues a command TO control_IO_BAT high level, the triode Q4 and the triode Q3 are both conducted, so that the MOS Q1 is turned on, then the winding N1 is excited by the high-frequency square wave of the V_BAT_TO_BUS+, the winding N3 outputs the voltage FROM_BAT+ obtained after full-bridge rectification TO serve as a second path input source of the BUS side auxiliary source, the BUS side auxiliary source is started, the control electricity consumption of the BUS side is built, and finally the normal work of the whole bidirectional converter is realized. Similarly, when starting, if the BUS port is powered on and the BAT port is powered off, the working conditions are similar, and the details are not repeated.
After the starting is finished and normal operation is carried out, the double MCU controls the MOS Q1 and the MOS Q2 to be turned off after confirming according to criteria, so that the isolation driving circuit ISO converter thoroughly exits from working, the loss of the circuit can be reduced, and the efficiency of the whole bidirectional isolation converter is improved.
It can be appreciated that the isolation driving circuit only works briefly at the time of starting or under abnormal conditions, and most of working conditions are in a dormant state. In addition, since V_BAT_TO_BUS+ is a closed loop control winding from the BAT side auxiliary source (similarly, V_BUS_TO_BAT+ is a closed loop control winding from the BUS side auxiliary source), the operating frequency of the isolation transformer will follow the switching frequencies of the BAT side auxiliary source and the BUS side auxiliary source.
In the embodiment, for a bi-directional isolation converter controlled by double MCUs, MCUs are arranged on two isolated sides, no matter which side port is electrified, auxiliary sources on the electrified side can be started first, then an isolation driving circuit ISO converter circuit is driven to work through the MCU on the electrified side, further auxiliary sources without electric measurement are started, the MCU on the other side is awakened, and finally the whole converter works.
Referring to fig. 12, fig. 12 is a schematic circuit diagram of an isolated driving circuit when the auxiliary source power supply circuit is applied to single MCU control according to an embodiment of the present invention. The auxiliary source power supply circuit applied to single MCU control provided by the embodiment mainly comprises an isolation chip and a BAT side MCU or a BUS side MCU connected with the isolation chip on the basis of the embodiment of fig. 7; if the BAT side MCU is included, the BAT side MCU is also connected with the BAT side auxiliary source; and if the BUS side MCU is included, the BUS side MCU is also connected with the BUS side auxiliary source.
Optionally, the device further comprises a BAT sampling module, a BAT driving module, a BUS sampling module and a BUS driving module; the BAT sampling module and the BAT driving module are respectively connected with the BAT side auxiliary source; the BUS sampling module and the BUS driving module are respectively connected with the BUS side auxiliary source; if the BAT side MCU is included, the BAT sampling module and the BAT driving module are respectively connected with the BAT side MCU; the BUS sampling module and the BUS driving module are respectively connected with the isolation chip; if the BUS side MCU is included, the BUS sampling module and the BUS driving module are respectively connected with the BUS side MCU; and the BAT sampling module and the BAT driving module are respectively connected with the isolation chip.
In this embodiment, the BAT side driving module and the BUS side driving module are both implemented by hardware circuits.
As a specific implementation manner of this embodiment, the isolation driving circuit mainly adds a triode Q7 in the dual MCU controlled auxiliary power supply scheme to realize self-driving on. As shown in fig. 12, the middle black dotted line in the drawing represents the isolation transformer, and the BAT side is located on the left side of the drawing and the BUS side is located on the right side of the drawing, with reference to the isolation transformer. The BAT side driving module in the isolation driving circuit comprises a controllable MOS transistor Q1, a triode Q3 and a triode Q4; the BUS side driving module comprises a controllable MOS tube Q2, a triode Q5 and a triode Q6;
the head end of a winding N1 of the isolation transformer in the auxiliary source power supply circuit is connected with the BAT side auxiliary source, the tail end of the winding N1 of the isolation transformer is connected with a controllable MOS tube Q1 in the BAT side driving module, and then the winding N1 of the isolation transformer is connected with the BAT side auxiliary source and the triode Q4 respectively through the triode Q3; the winding N2 of the isolation transformer is connected with the BUS side auxiliary source; the head end of a winding N4 of the isolation transformer is connected with the BUS side auxiliary source, the tail end of the winding N4 is connected with a controllable MOS tube Q2 of the BUS side driving module, and then is connected with the BUS side auxiliary source and the triode Q6 respectively through the triode Q5; the winding N2 is connected with the BAT side auxiliary source;
if the BAT side MCU is included, the BUS side driving circuit further comprises a triode Q7; the triode Q6 is connected with the BAT side MCU through the triode Q7; the triode Q4 is connected with the BAT side MCU;
if the BUS side MCU is included, the BAT side driving circuit further comprises a triode Q7; the triode Q4 is connected with the BUS side MCU through the triode Q7; and the triode Q6 is connected with the BUS side MCU.
The working principle of the auxiliary source power supply circuit controlled by the single MCU is described below by taking the working condition including the BUS side MCU, namely that the unique MUC is placed on the BUS side as an example:
when the power supply is started, if the BUS terminal is electrified and the BAT terminal is unpowered, at the moment, the BUS side auxiliary source can be started automatically, after the BUS-MCU is electrified and initialized, a command control_from_BUS (isolated) high level is issued, so that the triode Q7 is conducted, the triodes Q4 and Q3 are both cut off, the MOS Q1 is turned off, then the command control_IO_BUS high level is issued, the triodes Q6 and Q5 are conducted, the MOS Q2 is turned on, the winding N4 is excited by a high-frequency square wave of V_BUS_TO_BAT+, the output of the winding N2 is used as a starting source of the BAT side auxiliary source, and the control electricity utilization of the BAT side is built finally, so that the whole bidirectional converter works normally.
When the power supply is started, if the BAT end is electrified and the BUS end is not electrified, the BAT side auxiliary source can be started automatically at the moment, and as the control_from_BUS is kept at a low level, the triode Q7 is cut off, the triodes Q4 and Q3 are conducted, and the MOS tube Q1 is opened; the winding N1 is excited by the high-frequency square wave of the V_BAT_TO_BUS+, so that the voltage FROM_BAT+ obtained by full-bridge rectification of the output of the winding N3 is used as a starting source of a BUS side auxiliary source, control electricity consumption of the BUS side is built, and normal operation of the whole bidirectional converter is finally realized.
After the starting is finished and normal operation is carried out, the MCU controls the MOS transistors Q1 and Q2 to be turned off after confirming according to criteria, so that the isolation driving circuit ISO controller thoroughly exits from working, the loss of the circuit can be reduced, and the efficiency of the whole bidirectional isolation converter is improved.
Similarly, the working condition that the only MCU of the bidirectional isolation converter is arranged on the BAT side is similar, and no more redundancy is needed.
It can be appreciated that the single MCU control scheme of this embodiment is different from the dual MCU control scheme in that the isolation driving circuit can be implemented to correspond to a driving module without an MCU, i.e. the controllable MOS can be self-driven on.
The embodiment of the invention also provides an auxiliary source power supply system of the bidirectional isolation converter, which comprises the auxiliary source power supply circuit of the bidirectional isolation converter. The structure of the auxiliary power supply circuit is not repeated here, and details of the auxiliary power supply circuit are described in the above embodiments.
The auxiliary source power supply circuit and system of the bidirectional isolation converter provided by the invention have the following advantages:
firstly, the two side auxiliary sources are mutually independent and are not directly communicated, and the isolation belt is not spanned, so that the two side auxiliary source circuits only need to be designed according to functional insulation, the requirement of reinforcing insulation is not required to be met, the insulation design can be simplified, and the cost is lower.
Secondly, two side auxiliary sources only have a heavy-duty closed loop output winding, the risk of multi-winding output cross adjustment rate does not exist, and the reliability is higher.
Finally, the newly added isolation driving circuit only works briefly when started or abnormal, so that the thermal design of the circuit is easy, and the overall efficiency can be improved.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It should be noted that in the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, third, etc. do not denote any order. These words may be interpreted as names.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
In the description of the present invention, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms should not be understood as necessarily being directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims (9)

1. The auxiliary source power supply circuit of the bidirectional isolation converter is characterized by comprising a BAT side auxiliary source, a BUS side auxiliary source and an isolation driving circuit; the BAT side auxiliary source is positioned on the BAT side; the BUS side auxiliary source is positioned on the BUS side; the BAT side auxiliary source is communicated with the BUS side auxiliary source through the isolation driving circuit, so that when the BAT side is in no power supply, the isolation driving circuit controls the BUS side auxiliary source to drive the BAT side auxiliary source, and when the BUS side is in no power supply, the isolation driving circuit controls the BAT side auxiliary source to drive the BUS side auxiliary source;
the auxiliary source power supply circuit further comprises an isolation transformer; the isolation driving circuit comprises a BAT side driving module and a BUS side driving module; the isolation transformer comprises a winding N1 and a winding N2 which are positioned on the BAT side, and a winding N3 and a winding N4 which are positioned on the BUS side; the winding N1 is connected with the BAT side auxiliary source through the BAT side driving module, and the winding N3 is connected with the BUS side auxiliary source; the winding N4 is connected with the BUS side auxiliary source through the BUS side driving module, and the winding N2 is connected with the BAT side auxiliary source.
2. The auxiliary power supply circuit of claim 1, wherein the BAT side driving module is a BAT side driving chip or a BAT side driving circuit; the BUS side driving module is a BUS side driving chip or a BUS side driving circuit.
3. The auxiliary power supply circuit of claim 1, further comprising a BAT-side MCU, a BUS-side MCU, and an isolation chip; the BAT side MCU is respectively connected with the BAT side auxiliary source and the isolation chip; and the BUS side MCU is respectively connected with the BUS side auxiliary source and the isolation chip.
4. The auxiliary power supply circuit as claimed in claim 3, wherein the BAT side driving module comprises a controllable MOS transistor Q1, a triode Q3 and a triode Q4; the BUS side driving module comprises a controllable MOS tube Q2, a triode Q5 and a triode Q6;
the head end of the winding N1 is connected with the BAT side auxiliary source, the tail end of the winding N1 is sequentially connected with the controllable MOS transistor Q1 and the triode Q3, and the triode Q3 is also respectively connected with the BAT side auxiliary source and the BAT side MCU through the triode Q4; the head end of the winding N4 is connected with the BUS side auxiliary source, the tail end of the winding N4 is sequentially connected with the controllable MOS transistor Q2 and the triode Q5, and the triode Q5 is also respectively connected with the BUS side auxiliary source and connected with the BUS side MCU through the triode Q6.
5. The auxiliary power supply circuit of claim 3, further comprising a BAT sampling module, a BAT driving module, a BUS sampling module, and a BUS driving module; the BAT sampling module is respectively connected with the BAT side auxiliary source and the BAT side MCU; the BAT driving module is respectively connected with the BAT side auxiliary source and the BAT side MCU; the BUS sampling module is respectively connected with the BUS side auxiliary source and the BUS side MCU; and the BUS driving module is respectively connected with the BUS side auxiliary source and the BUS side MCU.
6. The auxiliary power supply circuit according to claim 1, further comprising an isolation chip and a BAT-side MCU or a BUS-side MCU connected to the isolation chip;
if the BAT side MCU is included, the BAT side MCU is also connected with the BAT side auxiliary source;
and if the BUS side MCU is included, the BUS side MCU is also connected with the BUS side auxiliary source.
7. The auxiliary power supply circuit as claimed in claim 6, wherein the BAT side driving module comprises a controllable MOS transistor Q1, a triode Q3 and a triode Q4; the BUS side driving module comprises a controllable MOS tube Q2, a triode Q5 and a triode Q6;
the head end of the winding N1 is connected with the BAT side auxiliary source, the tail end of the winding N1 is connected with the controllable MOS tube Q1, and then is connected with the BAT side auxiliary source and the triode Q4 respectively through the triode Q3; the winding N3 is connected with the BUS side auxiliary source; the head end of the winding N4 is connected with the BUS side auxiliary source, the tail end of the winding N4 is connected with the controllable MOS tube Q2, and then is connected with the BUS side auxiliary source and the triode Q6 respectively through the triode Q5; the winding N2 is connected with the BAT side auxiliary source;
if the BAT side MCU is included, the BUS side driving module further comprises a triode Q7; the triode Q6 is connected with the BAT side MCU through the triode Q7; the triode Q4 is connected with the BAT side MCU;
if the BUS side MCU is included, the BAT side driving module further comprises a triode Q7; the triode Q4 is connected with the BUS side MCU through the triode Q7; and the triode Q6 is connected with the BUS side MCU.
8. The auxiliary power supply circuit of claim 6, further comprising a BAT sampling module, a BAT driving module, a BUS sampling module, and a BUS driving module; the BAT sampling module and the BAT driving module are respectively connected with the BAT side auxiliary source; the BUS sampling module and the BUS driving module are respectively connected with the BUS side auxiliary source;
if the BAT side MCU is included, the BAT sampling module and the BAT driving module are respectively connected with the BAT side MCU; the BUS sampling module and the BUS driving module are respectively connected with the isolation chip;
if the BUS side MCU is included, the BUS sampling module and the BUS driving module are respectively connected with the BUS side MCU; and the BAT sampling module and the BAT driving module are respectively connected with the isolation chip.
9. An auxiliary power supply system for a bidirectional isolation converter, comprising an auxiliary power supply circuit for a bidirectional isolation converter as claimed in any one of claims 1 to 8.
CN202310890683.1A 2023-07-20 2023-07-20 Auxiliary source power supply circuit and system of bidirectional isolation converter Active CN116647130B (en)

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US5424932A (en) * 1993-01-05 1995-06-13 Yokogawa Electric Corporation Multi-output switching power supply having an improved secondary output circuit
US20110255315A1 (en) * 2010-04-16 2011-10-20 Tdk-Lambda Corporation Switching power supply device
CN202679251U (en) * 2012-06-11 2013-01-16 广州金升阳科技有限公司 Signal isolation transmitter
CN214154342U (en) * 2020-12-04 2021-09-07 深圳市振华微电子有限公司 Magnetic isolation wide-range input voltage stabilizing circuit
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