CN215817642U

CN215817642U - Auxiliary power supply system, power supply device and battery replacing cabinet

Info

Publication number: CN215817642U
Application number: CN202121562376.3U
Authority: CN
Inventors: 吴洋
Original assignee: Shenzhen Topband Co Ltd
Current assignee: Shenzhen Topband Co Ltd
Priority date: 2021-07-09
Filing date: 2021-07-09
Publication date: 2022-02-11
Anticipated expiration: 2031-07-09

Abstract

The utility model relates to an auxiliary power supply system, a power supply device and a power conversion cabinet, which comprise an alternating current input end, a first conversion unit, a second conversion unit and an auxiliary power supply module; the alternating current input end is connected with alternating current; the input end of the first conversion unit is connected with the alternating current input end, the output end of the first conversion unit is connected with the input end of the second conversion unit, and the output end of the second conversion unit is connected with the battery; the input end of the auxiliary power supply module is connected with the output end of the first conversion unit and the input end of the second conversion unit, and the output end of the auxiliary power supply module is connected with the load of the power conversion cabinet; when the alternating current is normal, the output of the first conversion unit supplies power to the auxiliary power supply module; when the alternating current is abnormal, the second conversion unit reversely takes electricity from the battery to supply power to the auxiliary power supply module. When the mains supply is abnormal, the utility model can reversely take electricity from the battery, ensure the output voltage of the auxiliary power supply to be stable, ensure the power exchange cabinet to continuously and normally exchange electricity, and improve the stability and reliability of the power exchange cabinet system.

Description

Auxiliary power supply system, power supply device and battery replacing cabinet

Technical Field

The utility model relates to the technical field of power exchange cabinets, in particular to an auxiliary power supply system, a power supply device and a power exchange cabinet.

Background

The market development of the power exchange cabinet is faster and faster, the reliability requirement on the power exchange cabinet is higher and higher, a plurality of subsystem modules are contained in the power exchange cabinet, and the load of each sub-module needs to be supplied with power in a centralized manner by a 12V auxiliary power supply system. And the power supply reliability of the subsystem operation is determined by the auxiliary power supply. Usually, the auxiliary power supply is centralized by using an AC-DC12V power module, but once the power grid is powered off or the power grid is unstable and falls, the auxiliary power supply is very unreliable, and even the auxiliary power supply is disconnected, the power conversion operation requirement cannot be met.

SUMMERY OF THE UTILITY MODEL

The present invention provides an auxiliary power system, a power supply device and a power exchange cabinet, which are designed to solve the above-mentioned drawbacks of the prior art.

The technical scheme adopted by the utility model for solving the technical problems is as follows: an auxiliary power supply system is constructed and applied to a power change cabinet, and comprises: the device comprises an alternating current input end, a first conversion unit, a second conversion unit and an auxiliary power supply module;

the alternating current input end is used for accessing alternating current;

the input end of the first conversion unit is connected with the alternating current input end, the output end of the first conversion unit is connected with the input end of the second conversion unit, and the output end of the second conversion unit is connected with a battery; the input end of the auxiliary power supply module is connected with the output end of the first conversion unit and the input end of the second conversion unit, and the output end of the auxiliary power supply module is connected with a load of the power conversion cabinet;

when the alternating current is normal, the first conversion unit outputs power to the auxiliary power supply module; when the alternating current is abnormal, the second conversion unit reversely obtains electricity from the battery to supply power to the auxiliary power supply module.

In the auxiliary power supply system of the present invention, the first conversion unit is an AC-DC module, and is configured to convert the alternating current into a direct current signal when the alternating current is normal.

In the auxiliary power supply system of the utility model, the AC-DC module includes: a non-isolated PFC module;

the non-isolated PFC module is used for converting the alternating current into a high-voltage direct current signal and correcting a power factor.

In the auxiliary power supply system of the present invention, the non-isolated PFC module includes: any one of a bridgeless PFC module, a staggered PFC module and a CCM PFC module.

In the auxiliary power supply system of the present invention, the AC-DC module further includes: an isolated DC-DC module;

the isolation DC-DC module is connected with the non-isolation PFC module and used for converting the high-voltage direct-current signal output by the non-isolation PFC module into a low-voltage direct-current signal.

In the auxiliary power supply system of the present invention, the isolation DC-DC module includes: any one of a full-bridge LLC module, a half-bridge LLC module and a phase-locked full-bridge module.

In the auxiliary power supply system of the utility model, the second conversion unit includes: a plurality of bidirectional converters arranged in parallel; the input end of each bidirectional converter is connected with the output end of the first conversion unit, and the output end of each bidirectional converter is connected with a battery.

In the auxiliary power supply system of the utility model, each of the bidirectional converters includes: a bidirectional non-isolated BUCK-BOOST module;

when the alternating current is normal, the bidirectional non-isolated BUCK-BOOST module works in a forward charging mode, the input end of the bidirectional non-isolated BUCK-BOOST module receives a low-voltage direct current signal output by the first conversion unit, and the output end of the bidirectional non-isolated BUCK-BOOST module is connected with a battery to provide a charging signal for the battery;

when the alternating current is abnormal, the bidirectional non-isolated BUCK-BOOST module works in a reverse power taking mode, the output end of the bidirectional non-isolated BUCK-BOOST module receives a discharging signal of the battery, and the input end of the bidirectional non-isolated BUCK-BOOST module is connected with the auxiliary power supply module to provide a direct current signal for the auxiliary power supply module.

In the auxiliary power supply system of the utility model, each of the bidirectional converters includes: a bidirectional isolation DC-DC module;

when the alternating current is normal, the bidirectional isolation DC-DC module works in a forward charging mode, the input end of the bidirectional isolation DC-DC module receives the high-voltage direct current signal output by the first conversion unit, and the output end of the bidirectional isolation DC-DC module is connected with a battery to provide a charging signal for the battery;

when the alternating current is abnormal, the bidirectional isolation DC-DC module works in a reverse power taking mode, the output end of the bidirectional isolation DC-DC module receives a discharging signal of the battery, and the input end of the bidirectional isolation DC-DC module is connected with the auxiliary power supply module to provide a direct current signal for the auxiliary power supply module.

In the auxiliary power supply system of the present invention, the bidirectional isolation DC-DC module includes: full-bridge LLC module.

In the auxiliary power supply system of the utility model, the auxiliary power supply module includes: any one of a half bridge LLC, a full bridge LLC and a phase-shifted full bridge.

In the auxiliary power supply system of the present invention, the ac input terminal includes: a zero line input end and a live line input end; the non-isolated PFC module includes: the power supply comprises a first diode, a first inductor, a second diode, a third diode, a first current transformer, a second current transformer, an eleventh MOS (metal oxide semiconductor) transistor, a twelfth MOS transistor and a first filter capacitor;

the second end of the first diode and the first end of the first inductor are connected with the live wire input end, and the third end of the first diode is grounded; the second end of the first inductor is connected with the first anode of the second diode, the cathode of the second diode is connected with the first end of the first diode, and the cathode of the second diode outputs a high-voltage direct-current signal; a second anode of the second diode is connected with a second end of the second inductor, a first end of the second inductor is connected with the zero line input end, a first end of the third diode is connected with a first end of the first diode, a second end of the third diode is connected with the zero line input end, and a third end of the third diode is grounded;

the first end of the first current transformer is connected to the PFC control chip, the second end of the first current transformer is grounded, the third end of the first current transformer is connected to the second end of the first inductor, the fourth end of the first current transformer is connected to the drain electrode of the eleventh MOS tube, the gate of the eleventh MOS tube is connected to the PFC control chip, and the source of the eleventh MOS tube is grounded; a first end of the second current transformer is connected to the PFC control chip, a second end of the second current transformer is grounded, a third end of the second current transformer is connected to a second end of the second inductor, a fourth end of the second current transformer is connected to a drain electrode of the twelfth MOS tube, a grid electrode of the twelfth MOS tube is connected to the PFC control chip, and a source electrode of the twelfth MOS tube is grounded;

the positive end of the first filter capacitor is connected with the cathode of the second diode, and the negative end of the first filter capacitor is grounded.

In the auxiliary power supply system of the present invention, the isolation DC-DC module includes: the first MOS tube, the second MOS tube, the seventh MOS tube, the eighth MOS tube, the first capacitor, the third inductor, the first transformer, the fifth MOS tube, the sixth MOS tube and the second filter capacitor;

the gate of the first MOS transistor is connected to an LLC control chip, the drain of the first MOS transistor and the drain of the second MOS transistor are connected to the output end of the non-isolated PFC module, the source of the first MOS transistor is connected to the drain of the seventh MOS transistor, the gate of the seventh MOS transistor is connected to the LLC control chip, the source of the seventh MOS transistor is grounded, the connection end of the seventh MOS transistor and the drain to the source of the first MOS transistor is connected to the first end of the first capacitor, the second end of the first capacitor is connected to the first end of the third inductor, the gate of the second MOS transistor is connected to the LLC control chip, the source of the second MOS transistor is connected to the drain of the eighth MOS transistor and to the second end of the first transformer, the gate of the eighth MOS transistor is connected to the LLC control chip, and the source of the eighth MOS transistor is grounded;

the third end of the first transformer is connected with the drain electrode of the sixth MOS tube, the fourth end of the first transformer is connected with the positive end of the second filter capacitor, the fifth end of the first transformer is connected with the drain electrode of the fifth MOS tube, the grid electrode of the fifth MOS tube is connected with the LLC control chip, the source electrode of the fifth MOS tube is grounded, the grid electrode of the sixth MOS tube is connected with the LLC control chip, the source electrode of the sixth MOS tube is grounded, and the negative end of the second filter capacitor is grounded;

the positive end of the second filter capacitor is the output end of the isolation DC-DC module.

In the auxiliary power supply system of the present invention, the bidirectional non-isolated BUCK-BOOST module includes: the third filter capacitor, the third MOS tube, the fourth MOS tube, the ninth MOS tube, the tenth MOS tube, the fourth inductor and the fourth filter capacitor;

the positive end of the third filter capacitor and the drain electrode of the third MOS tube are connected with the output end of the first conversion unit, the negative end of the third filter capacitor is grounded, the gate electrode of the third MOS tube is connected with the BUCK control chip, the source electrode of the third MOS tube is connected with the first end of the fourth inductor and the drain electrode of the ninth MOS tube, the gate electrode of the ninth MOS tube is connected with the BUCK control chip, and the source electrode of the ninth MOS tube is grounded;

the drain electrode of the fourth MOS tube and the positive end of the fourth filter capacitor are connected with a power supply, the grid electrode of the fourth MOS tube is connected with the BUCK control chip, the source electrode of the fourth MOS tube is connected with the second end of the fourth inductor and the drain electrode of the tenth MOS tube, the grid electrode of the tenth MOS tube is connected with the BUCK control chip, and the source electrode of the tenth MOS tube and the negative end of the fourth filter capacitor are grounded.

In the auxiliary power supply system of the present invention, the bidirectional isolation DC-DC module includes: a thirteenth MOS tube, a fourteenth MOS tube, an eighteenth MOS tube, a twenty-first MOS tube, a second capacitor, a sixth inductor, a second transformer, a sixteenth MOS tube, a fifteenth MOS tube, a twenty-twelfth MOS tube and a twenty-thirteenth MOS tube;

a grid electrode of the thirteenth MOS tube is connected with the LLC control chip, a drain electrode of the thirteenth MOS tube and a drain electrode of the fourteenth MOS tube are connected with the output end of the first conversion unit, and a source electrode of the thirteenth MOS tube is connected with a drain electrode of the eighteenth MOS tube and a second end of the second inductor; the gate of the eighteenth MOS tube is connected with the LLC control chip, and the source of the eighteenth MOS tube is grounded; a grid electrode of the fourteenth MOS tube is connected with the LLC control chip, a source electrode of the fourteenth MOS tube is connected with a drain electrode of the twenty-first MOS tube and is connected to the second end of the second transformer, a grid electrode of the twenty-first MOS tube is connected with the LLC control chip, a source electrode of the twenty-first MOS tube is grounded, and a second end of the second capacitor is connected with the first end of the sixth inductor;

a second end of the sixth inductor is connected with a first end of the second transformer, a third end of the second transformer is connected with a source electrode of the fifteenth MOS transistor, and a fourth end of the second transformer is connected with a drain electrode of the twenty-second MOS transistor; the drain electrode of the sixteenth MOS tube and the drain electrode of the fifteenth MOS tube are connected with a power supply, the grid electrode of the sixteenth MOS tube is connected with the LLC control chip, and the source electrode of the sixteenth MOS tube is connected with the drain electrode of the twenty-second MOS tube; the gate of the fifteenth MOS tube is connected with the LLC control chip, and the source of the fifteenth MOS tube is connected with the drain of the twenty-third MOS tube; the source electrode of the twenty-second MOS tube and the source electrode of the twenty-third MOS tube are grounded, the grid electrode of the twenty-second MOS tube is connected with the LLC control chip, and the grid electrode of the twenty-third MOS tube is connected with the LLC control chip.

In the auxiliary power supply system of the utility model, the auxiliary power supply module includes: a seventeenth MOS transistor, a twenty-fourth MOS transistor, a fifth inductor, a third capacitor, a third transformer, a nineteenth MOS transistor, a twentieth MOS transistor, and a fifth filter capacitor;

a grid electrode of the seventeenth MOS tube is connected with a power supply controller, a drain electrode of the seventeenth MOS tube is connected with the output end of the first conversion unit and the input end of the second conversion unit, and a source electrode of the seventeenth MOS tube is connected with a drain electrode of the twenty-fourth MOS tube and a first end of the fifth inductor; the grid electrode of the twenty-fourth MOS tube is connected with the power supply controller, and the source electrode of the twenty-fourth MOS tube is grounded;

a second end of the fifth inductor is connected with a first end of the third transformer, a first end of the third capacitor is grounded, and a second end of the third capacitor is connected with a second end of the third transformer; a third end of the third transformer is connected with a drain electrode of the twentieth MOS tube, a fourth end of the third transformer is connected with a positive end of the fifth filter capacitor, and a fifth end of the third transformer is connected with a drain electrode of the nineteenth MOS tube;

the grid electrode of the nineteenth MOS tube is connected with the power supply controller, the source electrode of the nineteenth MOS tube, the source electrode of the twentieth MOS tube and the negative end of the fifth filter capacitor are grounded, and the grid electrode of the twentieth MOS tube is connected with the power supply controller.

The utility model also provides a power supply device which comprises the auxiliary power supply system.

The utility model also provides a battery replacement cabinet which comprises the auxiliary power supply system.

The auxiliary power supply system, the power supply device and the power exchange cabinet have the following beneficial effects that: the power supply comprises an alternating current input end, a first conversion unit, a second conversion unit and an auxiliary power supply module; the alternating current input end is connected with alternating current; the input end of the first conversion unit is connected with the alternating current input end, the output end of the first conversion unit is connected with the input end of the second conversion unit, and the output end of the second conversion unit is connected with the battery; the input end of the auxiliary power supply module is connected with the output end of the first conversion unit and the input end of the second conversion unit, and the output end of the auxiliary power supply module is connected with the load of the power conversion cabinet; when the alternating current is normal, the output of the first conversion unit supplies power to the auxiliary power supply module; when the alternating current is abnormal, the second conversion unit reversely takes electricity from the battery to supply power to the auxiliary power supply module. When the mains supply is abnormal, the utility model can reversely take electricity from the battery, ensure the output voltage of the auxiliary power supply to be stable, ensure the power exchange cabinet to continuously and normally exchange electricity, and improve the stability and reliability of the power exchange cabinet system.

Drawings

The utility model will be further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a functional block diagram of an auxiliary power system provided by an embodiment of the present invention;

fig. 2 is a circuit diagram of a non-isolated PFC module provided by the present invention;

FIG. 3 is a circuit diagram of an isolated DC-DC module provided by the present invention;

FIG. 4 is a circuit diagram of a bidirectional non-isolated BUCK-BOOST module provided by the present invention;

FIG. 5 is a circuit diagram of a bi-directional isolation DC-DC module provided by the present invention;

fig. 6 is a circuit diagram of an auxiliary power supply provided by the present invention.

Detailed Description

For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

Referring to fig. 1, a schematic block diagram of an alternative embodiment of an auxiliary power system is provided. The auxiliary power supply system can be applied to the power exchange cabinet, and of course, the auxiliary power supply system can also be applied to other power supply systems, and is not limited to the field of power exchange cabinets.

Specifically, as shown in fig. 1, the auxiliary power supply system includes: the power supply comprises an alternating current input end 101, a first conversion unit 102, a second conversion unit 103 and an auxiliary power supply module 104.

The ac input 101 is used for receiving ac power.

The input end of the first conversion unit 102 is connected with the alternating current input end 101, the output end of the first conversion unit 102 is connected with the input end of the second conversion unit 103, and the output end of the second conversion unit 103 is connected with the battery; the input end of the auxiliary power module 104 is connected to the output end of the first conversion unit 102 and the input end of the second conversion unit 103, and the output end of the auxiliary power module 104 is connected to the load of the switch cabinet.

When the alternating current is normal, the output of the first conversion unit 102 supplies power to the auxiliary power supply module 104; when the alternating current is abnormal, the second conversion unit 103 reversely takes power from the battery to supply power to the auxiliary power supply module 104.

Specifically, when the ac power is normal, the first conversion unit 102 accesses the ac power through the ac input terminal 101, converts the ac power and outputs a dc signal, and the dc signal is input to the second conversion unit 103, so that the second conversion unit 103 supplies power to the battery connected thereto after conversion processing, thereby charging the battery; meanwhile, the direct current signal is also input to the auxiliary power supply module 104, and the auxiliary power supply module 104 outputs a power supply signal to the load of the battery replacement cabinet after processing, so as to meet the power consumption requirement of the load of the battery replacement cabinet. When the alternating current is abnormal (such as power failure), the first conversion unit 102 does not work, the output end of the first conversion unit does not output, at the moment, the second conversion unit 103 reversely gets power from the battery, the second conversion unit 103 performs conversion processing to output a corresponding direct current signal to the auxiliary power supply module 104, power supply to the auxiliary power supply module 104 is realized, the auxiliary power supply module 104 outputs a power supply signal to the power conversion cabinet load after processing, the power consumption requirement of the power conversion cabinet load is met, the sustainable power conversion operation requirement of the power conversion cabinet can be still ensured when the alternating current is abnormal, and the stability and the reliability of the power conversion cabinet system are ensured.

Optionally, in an embodiment of the present invention, the dc signal output by the first conversion unit 102 may be a low-voltage dc signal or a high-voltage dc signal, and is determined by a circuit configuration of the first conversion unit 102.

In some embodiments, the first conversion unit 102 is an AC-DC module for converting an alternating current into a direct current signal when the alternating current is normal. Alternatively, the AC-DC module may be formed of a variety of circuit architectures. For example, the AC-DC module may be comprised of a non-isolated PFC module 1021, or the AC-DC module may be comprised of a non-isolated PFC module 1021 and an isolated DC-DC module 1022. When the AC-DC module is composed of the non-isolated PFC module 1021, the output direct current signal is a high voltage direct current signal; when the AC-DC module is composed of the non-isolated PFC module 1021 and the isolated DC-DC module 1022, the output DC signal is a low-voltage DC signal. Of course, it is understood that the AC-DC module may also be formed using other circuit architectures and is not limited to the illustrated embodiments of the present invention.

Specifically, in some embodiments, the AC-DC module includes: a non-isolated PFC module 1021; the non-isolated PFC module 1021 is configured to convert ac power into a high voltage dc signal and perform power factor correction. In an embodiment of the present invention, the non-isolated PFC module 1021 may include, but is not limited to: any one of a bridgeless PFC module, a staggered PFC module and a CCM PFC module. The bridgeless PFC module is a high-efficiency high-power PFC module, and can enable a power supply to obtain higher efficiency. The CCM PFC module is generally used in low power applications, and therefore, may be selected for applications without high power requirements. The staggered PFC module is in a high-power form, and can meet the occasions with high-power requirements. In specific use, different PFC topology forms may be selected according to requirements, and the present invention is not particularly limited. Of course, it is understood that the PFC module may also adopt other forms of PFC modules, and is not limited to the illustrated embodiments of the present invention.

In other embodiments, the AC-DC module may further include, on the basis of the non-isolated PFC module 1021: the isolated DC-DC module 1022. The isolated DC-DC module 1022 is connected to the non-isolated PFC module 1021, and is configured to convert the high-voltage DC signal output by the non-isolated PFC module 1021 into a low-voltage DC signal.

Optionally, the isolated DC-DC module 1022 may include, but is not limited to: any one of a full-bridge LLC module, a half-bridge LLC module and a phase-locked full-bridge module. Of course, it is understood that the DC-DC module may also take other forms of DC-DC module, and is not limited to the illustrated embodiments of the present invention.

In this embodiment of the present invention, the second converting unit 103 includes: a plurality of bidirectional converters arranged in parallel; the input end of each bidirectional converter is connected with the output end of the first conversion unit 102, and the output end of each bidirectional converter is connected with the battery. For example, as shown in fig. 1, the second conversion unit 103 may include 1, 2, … …, N bidirectional converters, wherein an output terminal of each bidirectional converter may be connected to a battery to charge the battery or to take power from the battery.

In the embodiment of the present invention, when the ac power is normal, the bidirectional converter is configured to convert the dc signal output from the first conversion unit 102, and then output a corresponding charging signal to charge the battery connected thereto; when the alternating current is abnormal, the bidirectional converter is used for reversely getting electricity from a battery connected with the bidirectional converter, and after a discharge signal output by the battery is converted, the discharge signal is transmitted to the auxiliary power supply module 104 so as to ensure that the output end of the auxiliary power supply module 104 stably outputs voltage and further ensure that the load of the battery replacement cabinet can keep normal work. When the alternating current is abnormal, any one of the bidirectional converters firstly detects whether the output end of the bidirectional converter is connected with the battery, and if so, the bidirectional converter reversely gets electricity from the connected battery. Of course, it is understood that when the ac power is abnormal, a plurality of bidirectional converters may also be used to obtain power from the battery connected thereto, and the present invention is not particularly limited, and only needs to satisfy the power supply requirement for the normal operation of the auxiliary power module 104.

In some embodiments, each bidirectional transducer comprises: bidirectional non-isolated BUCK-BOOST module 1031.

When the ac power is normal, the bidirectional non-isolated BUCK-BOOST module 1031 operates in the forward charging mode, the input end of the bidirectional non-isolated BUCK-BOOST module 1031 receives the low-voltage dc signal output by the first conversion unit 102, and the output end of the bidirectional non-isolated BUCK-BOOST module 1031 is connected to the battery to provide the charging signal to the battery. When the alternating current is abnormal, the bidirectional non-isolated BUCK-BOOST module 1031 works in a reverse power-taking mode, the output end of the bidirectional non-isolated BUCK-BOOST module 1031 receives a discharging signal of the battery, and the input end of the bidirectional non-isolated BUCK-BOOST module 1031 is connected with the auxiliary power supply module 104 to provide a direct current signal for the auxiliary power supply module 104.

Alternatively, in some other embodiments, each bidirectional converter includes: a bi-directional isolation DC-DC module 1032.

When the alternating current is normal, the bidirectional isolation DC-DC module 1032 works in a forward charging mode, an input end of the bidirectional isolation DC-DC module 1032 receives the high-voltage direct current signal output by the first conversion unit 102, and an output end of the bidirectional isolation DC-DC module 1032 is connected to the battery to provide a charging signal for the battery. When the alternating current is abnormal, the bidirectional isolation DC-DC module 1032 works in a reverse power taking mode, an output end of the bidirectional isolation DC-DC module 1032 receives a discharging signal of the battery, and an input end of the bidirectional isolation DC-DC module 1032 is connected with the auxiliary power supply module 104 to provide a direct current signal to the auxiliary power supply module 104. Optionally, in this embodiment of the present invention, the bidirectional isolation DC-DC module 1032 includes: full-bridge LLC module.

Specifically, when the bidirectional converter adopts the bidirectional non-isolated BUCK-BOOST module 1031, the AC-DC module adopts the non-isolated PFC module 1021 and the isolated DC-DC module 1022. When the bidirectional converter adopts the architecture of the bidirectional isolation DC-DC module 1032, the AC-DC module adopts the non-isolation PFC module 1021. That is, in the embodiment of the present invention, the constituent architectures of the first conversion unit 102 and the second conversion unit 103 may include, but are not limited to: the non-isolated PFC module 1021+ the isolated DC-DC module 1022+ the bidirectional BUCK-BOOST module; non-isolated PFC module 1021+ bi-directional isolated DC-DC module 1032.

In the embodiment of the present invention, the auxiliary power module 104 includes: any one of a half bridge LLC, a full bridge LLC and a phase-shifted full bridge. When the alternating current is normal, if the alternating current is a non-isolated PFC module 1021, an isolated DC-DC module 1022 and a bidirectional BUCK-BOOST module, the input of the auxiliary power supply is a low-voltage direct current signal; if the input voltage is the non-isolated PFC module 1021+ bidirectional isolated DC-DC module 1032, the input of the auxiliary power supply is the high voltage DC signal.

Specifically, fig. 2 to 6 are circuit diagrams of a preferred embodiment of the present invention.

Referring to fig. 2, fig. 2 is a circuit diagram of a non-isolated PFC module 1021. In this embodiment, the non-isolated PFC module 1021 is of a bridgeless PFC architecture.

Specifically, as shown in fig. 2, the ac input terminal 101 includes: a zero line input (N) and a live line input (L). The non-isolated PFC module 1021 includes: the circuit comprises a first diode D1, a first inductor L1, a second inductor L2, a second diode D2, a third diode D3, a first current transformer CT1, a second current transformer CT2, an eleventh MOS tube Q11, a twelfth MOS tube Q12 and a first filter capacitor EC 1.

The second end of the first diode D1 and the first end of the first inductor L1 are connected with the live wire input end, and the third end of the first diode D1 is grounded; a second end of the first inductor L1 is connected to a first anode of the second diode D2, a cathode of the second diode D2 is connected to a first end of the first diode D1, and a cathode of the second diode D2 outputs a high-voltage direct-current signal; the second anode of the second diode D2 is connected to the second end of the second inductor L2, the first end of the second inductor L2 is connected to the neutral input terminal, the first end of the third diode D3 is connected to the first end of the first diode D1, the second end of the third diode D3 is connected to the neutral input terminal, and the third end of the third diode D3 is grounded.

The first end of the first current transformer CT1 is connected to a PFC control Chip (CTA), the second end of the first current transformer CT1 is grounded, the third end of the first current transformer CT1 is connected to the second end of the first inductor L1, the fourth end of the first current transformer CT1 is connected to the drain of an eleventh MOS transistor Q11, the gate of the eleventh MOS transistor Q11 is connected to the PFC control chip (DRV-PFC-a), and the source of the eleventh MOS transistor Q11 is grounded; the first end of the second current transformer CT2 is connected to the PFC control Chip (CTB), the second end of the second current transformer CT2 is grounded, the third end of the second current transformer CT2 is connected to the second end of the second inductor L2, the fourth end of the second current transformer CT2 is connected to the drain of the twelfth MOS transistor Q12, the gate of the twelfth MOS transistor Q12 is connected to the PFC control chip (DRV-PFC-B), and the source of the twelfth MOS transistor Q12 is grounded. The positive terminal of the first filter capacitor EC1 is connected to the cathode of the second diode D2, and the negative terminal of the first filter capacitor EC1 is grounded.

As shown in fig. 2, the non-isolated PFC module 1021 is configured to convert ac power input from the ac input terminal 101 into a high-voltage dc signal, provide dc input for a subsequent module, correct a power factor, and suppress a harmonic of a power grid, so as to improve a utilization rate of the power grid. The first diode D1 and the third diode D3 are freewheeling diodes, the first inductor L1 and the second inductor L2 are PFC inductors for boosting voltage, the eleventh MOS transistor Q11 and the twelfth MOS transistor Q12 function as switching transistors, the second diode D2 is a rectifying function, and the first filter capacitor EC1 is used for filtering output voltage.

Referring to fig. 3, fig. 3 is a circuit diagram of the isolated DC-DC module 1022. In this embodiment, the DC-DC adopts a half-bridge LLC architecture.

As shown in fig. 3, the isolated DC-DC module 1022 includes: the circuit comprises a first MOS transistor Q1, a second MOS transistor Q2, a seventh MOS transistor Q7, an eighth MOS transistor Q8, a first capacitor C1, a third inductor L3, a first transformer T1, a fifth MOS transistor Q5, a sixth MOS transistor Q6 and a second filter capacitor EC 2.

The gate of the first MOS transistor Q1 is connected to the LLC control chip (DRV-a1), the drain of the first MOS transistor Q1 and the drain of the second MOS transistor Q2 are connected to the output end of the non-isolated PFC module 1021, the source of the first MOS transistor Q1 is connected to the drain of the seventh MOS transistor Q7, the gate of the seventh MOS transistor Q7 is connected to the LLC control chip (DRV-D1), the source of the seventh MOS transistor Q7 is grounded, the connection ends of the seventh MOS transistor Q7, the drain and the source of the first MOS transistor Q1 are connected to the first end of the first capacitor C1, the second end of the first capacitor C1 is connected to the first end of the third inductor L3, the gate of the second MOS transistor Q2 is connected to the LLC control chip (DRV-B1), the source of the second MOS transistor Q2 is connected to the drain of the eighth MOS transistor Q8 and is connected to the second end of the first transformer T1, the gate of the eighth MOS transistor Q5 is connected to the source of the eighth MOS transistor Q8, and the source of the eighth MOS transistor Q8 is connected to the second transformer T1.

The third end of the first transformer T1 is connected with the drain of a sixth MOS tube Q6, the fourth end of the first transformer T1 is connected with the positive end of a second filter capacitor EC2, the fifth end of the first transformer T1 is connected with the drain of a fifth MOS tube Q5, the gate of the fifth MOS tube Q5 is connected with an LLC control chip (DR-DVRA1), the source of the fifth MOS tube Q5 is grounded, the gate of the sixth MOS tube Q6 is connected with the LLC control chip (DR-DVRB1), the source of the sixth MOS tube Q6 is grounded, and the negative end of the second filter capacitor EC2 is grounded; the positive terminal of the second filter capacitor EC2 is the output of the isolated DC-DC module 1022.

The isolation DC-DC module 1022 converts the high voltage DC signal output by the non-isolation PFC module 1021 into a low voltage DC signal, so as to provide a low voltage DC for the subsequent module. The first MOS transistor Q1, the second MOS transistor Q2, the seventh MOS transistor Q7, and the eighth MOS transistor Q8 are switching transistors, the first capacitor C1 is a resonant capacitor, the third inductor L3 is a resonant inductor, the first transformer T1 is used for energy storage and voltage conversion, the fifth MOS transistor Q5 and the sixth MOS transistor Q6 perform synchronous rectification, and the second filter capacitor EC2 filters output voltage.

Referring to fig. 4, fig. 4 is a circuit diagram of a non-isolated BUCK-BOOST module.

As shown in fig. 4, the bidirectional non-isolated BUCK-BOOST module 1031 includes: the third filter capacitor EC3, the third MOS transistor Q3, the fourth MOS transistor Q4, the ninth MOS transistor Q9, the tenth MOS transistor Q10, the fourth inductor L4, and the fourth filter capacitor EC 4.

The positive end of the third filter capacitor EC3 and the drain of the third MOS transistor Q3 are connected to the output end of the first conversion unit 102, the negative end of the third filter capacitor EC3 is grounded, the gate of the third MOS transistor Q3 is connected to a BUCK control chip (DRV-a2), the source of the third MOS transistor Q3 is connected to the first end of the fourth inductor L4 and the drain of the ninth MOS transistor Q9, the gate of the ninth MOS transistor Q9 is connected to the BUCK control chip (DRV-D2), and the source of the ninth MOS transistor Q9 is grounded. The drain of the fourth MOS transistor Q4 and the positive terminal of the fourth filter capacitor EC4 are connected to a power supply (VBAT), the gate of the fourth MOS transistor Q4 is connected to a BUCK control chip (DRV-B2), the source of the fourth MOS transistor Q4 is connected to the second terminal of the fourth inductor L4 and the drain of the tenth MOS, the gate of the tenth MOS transistor Q10 is connected to the BUCK control chip (DRV-C2), and the source of the tenth MOS transistor Q10 and the negative terminal of the fourth filter capacitor EC4 are grounded.

As shown in fig. 4, when the ac power is normal, the bidirectional non-isolated BUCK-BOOST module 1031 is in a downward charging mode, the input terminal of the bidirectional non-isolated BUCK-BOOST module 1031 is a low-voltage dc signal input, and the output terminal of the bidirectional non-isolated BUCK-BOOST module 1031 is connected to the battery to provide a charging signal for the battery; when the ac power is abnormal, the bidirectional non-isolated BUCK-BOOST module 1031 is in a reverse power-taking mode, the output terminal of the bidirectional non-isolated BUCK-BOOST module 1031 is connected to the battery, the input terminal of the bidirectional non-isolated BUCK-BOOST module 1031 is connected to the discharging signal of the battery, and the input terminal of the bidirectional non-isolated BUCK-BOOST module 1031 is connected to the auxiliary power module 104, outputs a low-voltage dc signal, and provides the dc power for the auxiliary power module 104. The third MOS transistor Q3, the fourth MOS transistor Q4, the ninth MOS transistor Q9, and the tenth MOS transistor Q10 are switching transistors, and the third filter capacitor EC3 and the fourth filter capacitor EC4 perform a filtering function.

Referring to fig. 5, fig. 5 is a circuit diagram of a bidirectional isolation DC-DC module 1032, in this embodiment, the bidirectional isolation DC-DC module 1032 is a full bridge LLC architecture.

As shown in fig. 5, the bi-directional isolation DC-DC module 1032 includes: a thirteenth MOS transistor Q13, a fourteenth MOS transistor Q14, an eighteenth MOS transistor Q18, a twenty-first MOS transistor Q21, a second capacitor C2, a sixth inductor L6, a second transformer T2, a sixteenth MOS transistor Q16, a fifteenth MOS transistor Q15, a twenty-second MOS transistor Q22, and a twenty-thirteenth MOS transistor Q23.

The gate of the thirteenth MOS transistor Q13 is connected to the LLC control chip (DRV-a4), the drain of the thirteenth MOS transistor Q13 and the drain of the fourteenth MOS transistor Q14 are connected to the output of the first conversion unit 102, and the source of the thirteenth MOS transistor Q13 is connected to the drain of the eighteenth MOS transistor Q18 and the second end of the second inductor L2; the gate of the eighteenth MOS tube Q18 is connected with the LLC control chip (DRV-D4), and the source of the eighteenth MOS tube Q18 is grounded; the gate of the fourteenth MOS transistor Q14 is connected to the LLC control chip (DRV-B4), the source of the fourteenth MOS transistor Q14 is connected to the drain of the twenty-first MOS transistor Q21 and to the second end of the second transformer T2, the gate of the twenty-first MOS transistor Q21 is connected to the LLC control chip (DRV-C4), the source of the twenty-first MOS transistor Q21 is grounded, and the second end of the second capacitor C2 is connected to the first end of the sixth inductor L6.

A second end of the sixth inductor L6 is connected to a first end of a second transformer T2, a third end of the second transformer T2 is connected to a source of a fifteenth MOS transistor Q15, and a fourth end of the second transformer T2 is connected to a drain of a twenty-second MOS transistor Q22; the drain of the sixteenth MOS transistor Q16 and the drain of the fifteenth MOS transistor Q15 are connected with a power supply (VBAT), the gate of the sixteenth MOS transistor Q16 is connected with the LLC control chip (DRV-B5), and the source of the sixteenth MOS transistor Q16 is connected with the drain of the twenty-second MOS transistor Q22; the gate of the fifteenth MOS tube Q15 is connected with the LLC control chip (DRV-A5), the source of the fifteenth MOS tube Q15 is connected with the drain of the twenty-third MOS tube Q23; the source of the twenty-second MOS tube Q22 and the source of the twenty-third MOS tube Q23 are grounded, the gate of the twenty-second MOS tube Q22 is connected with the LLC control chip (DRV-C5), and the gate of the twenty-third MOS tube Q23 is connected with the LLC control chip (DRV-D5).

As shown in fig. 5, when the ac power is normal, the bidirectional isolation DC-DC module 1032 operates in a forward charging mode, an input end of the bidirectional isolation DC-DC module 1032 is a high voltage DC signal, and an output end thereof is connected to the battery to provide a charging signal for the battery; when the alternating current is abnormal, the bidirectional isolation DC-DC module 1032 works in a reverse power-taking mode, the output end of the bidirectional isolation DC-DC module 1032 takes power from the battery, the battery discharge signal is accessed, after the discharge signal output by the battery is converted, a high-voltage direct current signal is output from the input end of the bidirectional isolation DC-DC module, and the high-voltage direct current signal is input to the auxiliary power supply module 104 to provide direct-current voltage input for the auxiliary power supply module 104.

Referring to fig. 6, fig. 6 is a circuit diagram of the auxiliary power supply module 104. In this embodiment, the auxiliary power module 104 employs a half-bridge LLC architecture.

As shown in fig. 6, the auxiliary power supply module 104 includes: a seventeenth MOS transistor Q17, a twenty-fourth MOS transistor Q24, a fifth inductor L5, a third capacitor C3, a third transformer T3, a nineteenth MOS transistor Q19, a twentieth MOS transistor Q20, and a fifth filter capacitor EC 5.

A gate of the seventeenth MOS transistor Q17 is connected to the power controller (DRV-A3), a drain of the seventeenth MOS transistor Q17 is connected to the output terminal of the first conversion unit 102 and the input terminal of the second conversion unit 103, and a source of the seventeenth MOS transistor Q17 is connected to a drain of the twenty-fourth MOS transistor Q24 and the first terminal of the fifth inductor L5; the gate of the twenty-fourth MOS transistor Q24 is connected with a power controller (DRV-B3), and the source of the twenty-fourth MOS transistor Q24 is grounded; a second end of the fifth inductor L5 is connected to the first end of the third transformer T3, a first end of the third capacitor C3 is grounded, and a second end of the third capacitor C3 is connected to the second end of the third transformer T3; the third end of the third transformer T3 is connected to the drain of the twentieth MOS transistor Q20, the fourth end of the third transformer T3 is connected to the positive end of the fifth filter capacitor EC5, and the fifth end of the third transformer T3 is connected to the drain of the nineteenth MOS transistor Q19; the gate of the nineteenth MOS tube Q19 is connected with the power controller (DR-DVRA3), the source of the nineteenth MOS tube Q19, the source of the twentieth MOS tube Q20 and the negative end of the fifth filter capacitor EC5 are grounded, and the gate of the twentieth MOS tube Q20 is connected with the power controller (DR-DVRB 3).

As shown in fig. 6, when the first conversion unit 102 and the second conversion unit 103 are configured as follows: when the non-isolated PFC module 1021, the isolated DC-DC module 1022 and the bidirectional BUCK-BOOS module are used, VIN is a low-voltage direct-current signal (48V); when the first conversion unit 102 and the second conversion unit 103 are configured as follows: when the non-isolated PFC module 1021+ the bidirectional isolated DC-DC module 1032, VIN is a high voltage DC signal (400V).

The utility model also provides a power supply device which comprises the auxiliary power supply system disclosed by the embodiment of the utility model. Through setting up this auxiliary power supply system, both can utilize the commercial power to ensure that power supply unit stably supplies power when the commercial power is normal, can directly get the electricity from the battery is backward when the commercial power is unusual again to guarantee that power supply unit sustainable stable accomplishes and trades the electric operation, promote power supply unit's reliability and stability.

The utility model also provides a battery replacement cabinet which comprises the auxiliary power supply system disclosed by the embodiment of the utility model. Through setting up this auxiliary power supply system, both can utilize the commercial power to ensure the normal work of changing electric cabinet load when the commercial power is normal, can directly get the electricity in the battery backward again when the commercial power is unusual to guarantee to change the sustainable stable completion of electric cabinet and trade the electric operation, promote the reliability and the stability of changing the electric cabinet.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.

Claims

1. An auxiliary power supply system is applied to a power change cabinet, and is characterized by comprising: the device comprises an alternating current input end, a first conversion unit, a second conversion unit and an auxiliary power supply module;

the alternating current input end is used for accessing alternating current;

2. The auxiliary power supply system according to claim 1, wherein the first conversion unit is an AC-DC module for converting the alternating current into a direct current signal when the alternating current is normal.

3. The auxiliary power supply system according to claim 2, wherein the AC-DC module includes: a non-isolated PFC module;

4. The auxiliary power system of claim 3, wherein the non-isolated PFC module comprises: any one of a bridgeless PFC module, a staggered PFC module and a CCM PFC module.

5. The auxiliary power supply system of claim 3, wherein the AC-DC module further comprises: an isolated DC-DC module;

6. The auxiliary power supply system of claim 5, wherein the isolated DC-DC module comprises: any one of a full-bridge LLC module, a half-bridge LLC module and a phase-locked full-bridge module.

7. The auxiliary power supply system according to claim 3, wherein the second conversion unit includes: a plurality of bidirectional converters arranged in parallel; the input end of each bidirectional converter is connected with the output end of the first conversion unit, and the output end of each bidirectional converter is connected with a battery.

8. The auxiliary power supply system according to claim 7, wherein each of the bidirectional converters comprises: a bidirectional non-isolated BUCK-BOOST module;

9. The auxiliary power supply system according to claim 7, wherein each of the bidirectional converters comprises: a bidirectional isolation DC-DC module;

10. The auxiliary power system of claim 9, wherein the bi-directional isolation DC-DC module comprises: full-bridge LLC module.

11. The auxiliary power supply system according to any one of claims 1 to 10, wherein the auxiliary power supply module includes: any one of a half bridge LLC, a full bridge LLC and a phase-shifted full bridge.

12. The auxiliary power supply system according to claim 10, wherein the ac input terminal includes: a zero line input end and a live line input end; the non-isolated PFC module includes: the power supply comprises a first diode, a first inductor, a second diode, a third diode, a first current transformer, a second current transformer, an eleventh MOS (metal oxide semiconductor) transistor, a twelfth MOS transistor and a first filter capacitor;

13. The auxiliary power supply system of claim 5, wherein the isolated DC-DC module comprises: the first MOS tube, the second MOS tube, the seventh MOS tube, the eighth MOS tube, the first capacitor, the third inductor, the first transformer, the fifth MOS tube, the sixth MOS tube and the second filter capacitor;

a third end of the first transformer is connected with a drain electrode of the sixth MOS tube, a fourth end of the first transformer is connected with a positive end of the second filter capacitor, a fifth end of the first transformer is connected with a drain electrode of the fifth MOS tube, a gate electrode of the fifth MOS tube is connected with the LLC control chip, and a source electrode of the fifth MOS tube is grounded; the grid electrode of the sixth MOS tube is connected with the LLC control chip, the source of the sixth MOS tube is grounded, and the negative end of the second filter capacitor is grounded;

14. The auxiliary power system of claim 8, wherein the bidirectional non-isolated BUCK-BOOST module comprises: the third filter capacitor, the third MOS tube, the fourth MOS tube, the ninth MOS tube, the tenth MOS tube, the fourth inductor and the fourth filter capacitor;

15. The auxiliary power system of claim 12, wherein the bi-directional isolation DC-DC module comprises: a thirteenth MOS tube, a fourteenth MOS tube, an eighteenth MOS tube, a twenty-first MOS tube, a second capacitor, a sixth inductor, a second transformer, a sixteenth MOS tube, a fifteenth MOS tube, a twenty-second MOS tube and a twenty-thirteenth MOS tube;

16. The auxiliary power supply system according to claim 1, wherein the auxiliary power supply module includes: a seventeenth MOS transistor, a twenty-fourth MOS transistor, a fifth inductor, a third capacitor, a third transformer, a nineteenth MOS transistor, a twentieth MOS transistor, and a fifth filter capacitor;

17. A power supply device characterized by comprising the auxiliary power supply system according to any one of claims 1 to 16.

18. A battery changing cabinet comprising an auxiliary power supply system as claimed in any one of claims 1 to 16.