DC-DC conversion device
By introducing a monitoring unit, a protection unit and an isolation conversion unit into the DC-DC conversion device, the insulation performance monitoring and pre-charge protection of the input and output terminals are realized, and the problem of low safety in the DC-DC conversion device in the prior art is solved, which significantly improves the safety.
Patent Information
- Application Number
- CN202421591594.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-05
- Publication Date
- 2025-04-22
- Estimated Expiration
- 2034-07-05
AI Technical Summary
In the prior art, the DC-DC conversion device has low safety, especially in the case of a multi-loop output module.
A DC-DC conversion device including a monitoring unit, a first protection unit, an isolation conversion unit and a second protection unit is designed. The monitoring unit is used to monitor the insulation performance of the input terminal, the first protection unit and the second protection unit are used to pre-charge protection of the input terminal and the output terminal, and the isolation conversion unit is used for electrical isolation.
By monitoring the insulation performance and pre-charge protection online, the safety of the DC-DC conversion device is significantly improved, and the problem of low safety in the prior art is solved.
Smart Images
Figure CN222785911U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of DC-DC converters, and in particular, to a DC-DC converter device. Background Art
[0002] A DC-DC converter is an electronic device that can convert input DC voltage into a stable DC voltage and is used in power conversion scenarios. In a power generation system, the output of the DC-DC converter can be further converted into AC power through a power regulation system for use by the load or to be incorporated into the power grid to ensure the reliability of power supply. When designing a DC-DC converter for power generation scenarios, if the input is a multi-circuit output module with multiple independent channels, multiple DC-DC converters are usually required to work in parallel. In this case, the safety of the DC-DC converter is lower. Utility Model Content
[0003] The main purpose of the present application is to provide a DC-DC converter to solve the problem of low safety of DC-DC converters in the prior art.
[0004] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a DC-DC conversion device is provided, including a monitoring unit, a first protection unit, an isolation conversion unit, and a second protection unit, wherein the input end of the monitoring unit is the input end of the DC-DC conversion device, the output end of the monitoring unit is electrically connected to the input end of the first protection unit, the output end of the first protection unit is electrically connected to the input end of the isolation conversion unit, the output end of the isolation conversion unit is electrically connected to the input end of the second protection unit, the output end of the second protection unit is the output end of the DC-DC conversion device, the monitoring unit is used to monitor the insulation performance of the input end of the DC-DC conversion device, the first protection unit is used to perform pre-charging protection on the input end of the DC-DC conversion device, the isolation conversion unit is used to electrically isolate the input end of the isolation conversion unit and the output end of the isolation conversion unit, and the second protection unit is used to perform pre-charging protection on the output end of the DC-DC conversion device.
[0005] Optionally, the DC-DC conversion device has multiple input channels, each of the input channels includes a positive input terminal and a negative input terminal, the monitoring unit includes multiple insulation monitoring devices, the insulation monitoring devices correspond to the input channels one by one, the first end of each of the insulation monitoring devices is the multiple positive input terminals, the second end of each of the insulation monitoring devices is the multiple negative input terminals, the third end of each of the insulation monitoring devices is grounded, and the insulation monitoring device is used to monitor the insulation performance of the positive input terminal and the insulation performance of the negative input terminal.
[0006] Optionally, the first protection unit includes multiple protection modules, the first end of each of the protection modules is respectively the multiple positive input terminals, the second end of each of the protection modules is respectively the multiple negative input terminals, each of the protection modules includes respectively a first pre-charging loop, a first voltage acquisition sub-module and a second voltage acquisition sub-module, the first end of the first pre-charging loop is electrically connected to the first end of the first voltage acquisition sub-module, the second end of the first pre-charging loop is electrically connected to the first end of the second voltage acquisition sub-module, the second end of the first voltage acquisition sub-module, the second end of the second voltage acquisition sub-module and the negative input terminal are electrically connected, the first pre-charging loop is used to pre-charge the output side device, the first voltage acquisition sub-module is used to collect the voltage of the input channel, the second voltage acquisition sub-module is used to collect the voltage of the input channel after pre-charging, and the input end of the output side device is electrically connected to the output end of the DC-DC conversion device.
[0007] Optionally, the first pre-charging loop includes a first switching device, a second switching device and a first impedance, the first end of the first switching device is electrically connected to the first end of the second switching device and is the first end of the first pre-charging loop, the second end of the first switching device is electrically connected to the first end of the first impedance, the second end of the first impedance is electrically connected to the second end of the second switching device and is the second end of the first pre-charging loop, and the first voltage acquisition submodule and the second voltage acquisition submodule respectively include voltage acquisition devices.
[0008] Optionally, the DC-DC conversion device has multiple input channels and one output channel, the input channels include a positive input terminal and a negative input terminal, the output channels include a positive output terminal and a negative output terminal, the isolation conversion unit includes a plurality of isolated DC-DC converters and a plurality of third switching devices, the isolated DC-DC converters correspond one-to-one to the input channels, the isolated DC-DC converters correspond one-to-one to the third switching devices, the first end of each of the isolated DC-DC converters is respectively the plurality of positive input terminals, the second end of each of the isolated DC-DC converters is respectively the plurality of negative input terminals, the third end of each of the isolated DC-DC converters is respectively electrically connected to the positive terminals of the plurality of third switching devices, the negative terminal of each of the third switching devices is respectively electrically connected to the positive output terminal, and the fourth end of each of the isolated DC-DC converters is respectively electrically connected to the negative output terminal.
[0009] Optionally, the DC-DC conversion device has an output channel, the output channel includes a positive output terminal and a negative output terminal, the second protection unit includes a second pre-charging loop, a first voltage acquisition module and a second voltage acquisition module, wherein the first end of the second pre-charging loop is electrically connected to the first end of the first voltage acquisition module, the second end of the second pre-charging loop is electrically connected to the first end of the second voltage acquisition module and is the positive output terminal, the second end of the first voltage acquisition module is electrically connected to the second end of the second voltage acquisition module and is the negative output terminal, the second pre-charging loop is used to pre-charge the output side device, the first voltage acquisition module is used to collect the voltage of the output channel after pre-charging, the second voltage acquisition module is used to collect the voltage of the output channel, and the input end of the output side device is electrically connected to the output end of the DC-DC conversion device.
[0010] Optionally, the second pre-charging loop includes a fourth switching device, a fifth switching device and a second impedance, the first end of the fourth switching device is electrically connected to the first end of the fifth switching device and is the first end of the second pre-charging loop, the second end of the fourth switching device is electrically connected to the first end of the second impedance, the second end of the second impedance is electrically connected to the second end of the fifth switching device and is the second end of the second pre-charging loop, and the first voltage acquisition module and the second voltage acquisition module respectively include voltage acquisition devices.
[0011] Optionally, the DC-DC conversion device has multiple input channels, each of the input channels includes a positive input terminal and a negative input terminal, and the DC-DC conversion device also includes multiple first current acquisition modules and multiple third impedances, wherein the first current acquisition modules correspond to the positive input terminals one-to-one, the third impedances correspond to the input channels one-to-one, each of the first current acquisition modules is electrically connected to the multiple positive input terminals, the first end of each of the third impedances is electrically connected to the multiple positive input terminals, the second end of each of the third impedances is electrically connected to the multiple negative input terminals, and the first current acquisition module is used to collect currents of the input channels.
[0012] Optionally, the DC-DC conversion device has an output channel, the output channel includes a positive output terminal and a negative output terminal, and the DC-DC conversion device also includes a fourth impedance, a fifth impedance, a sixth switching device and a second current acquisition module, wherein the first end of the sixth switching device, the first end of the fifth impedance and the positive output terminal are electrically connected, the second end of the sixth switching device is electrically connected to the first end of the fourth impedance, the second end of the fourth impedance, the second end of the fifth impedance and the negative output terminal are electrically connected, the second current acquisition module is electrically connected to the positive output terminal, and the second current acquisition module is used to collect the current of the output channel.
[0013] Optionally, the DC-DC conversion device further includes a heat dissipation unit, the heat dissipation unit includes a water cooling pipeline, one end of the water cooling pipeline is a water inlet, and the other end of the water cooling pipeline is a water outlet, and the heat dissipation unit is used to dissipate heat for the DC-DC conversion device.
[0014] Applying the technical solution of the present application, the DC-DC conversion device includes a monitoring unit, a first protection unit, an isolation conversion unit, and a second protection unit. The input end of the monitoring unit is the input end of the DC-DC conversion device, the output end of the monitoring unit is electrically connected to the input end of the first protection unit, the output end of the first protection unit is electrically connected to the input end of the isolation conversion unit, the output end of the isolation conversion unit is electrically connected to the input end of the second protection unit, and the output end of the second protection unit is the output end of the DC-DC conversion device. The monitoring unit is used to monitor the insulation performance of the input end of the DC-DC conversion device. The first protection unit is used to perform pre-charging protection on the input end of the DC-DC conversion device. The isolation conversion unit is used to electrically isolate the input end of the isolation conversion unit and the output end of the isolation conversion unit. The second protection unit is used to perform pre-charging protection on the output end of the DC-DC conversion device. The DC-DC conversion device realizes online monitoring of the insulation resistance value of the DC-DC conversion device through the monitoring unit, ensures that the DC-DC conversion device has good insulation performance, and improves safety. In addition, the first protection unit and the second protection unit can respectively realize the pre-charging protection function on both sides of the input end and the output end, which can also improve safety. Combining the monitoring unit, the first protection unit and the second unit can greatly improve the safety of the DC-DC converter, solving the problem of low safety of the DC-DC converter in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] The drawings constituting part of the present application are used to provide a further understanding of the present application. The exemplary embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:
[0016] Figure 1A schematic diagram of the structure of a DC-DC converter in the prior art is shown;
[0017] Figure 2 A schematic structural diagram of a DC-DC converter according to an embodiment of the present application is shown;
[0018] Figure 3 A schematic structural diagram of another DC-DC converter according to an embodiment of the present application is shown;
[0019] Figure 4 A schematic structural diagram of another DC-DC converter according to an embodiment of the present application is shown;
[0020] Figure 5 A schematic structural diagram of another DC-DC converter according to an embodiment of the present application is shown;
[0021] Figure 6 A schematic structural diagram of another DC-DC converter according to an embodiment of the present application is shown;
[0022] Figure 7 A schematic structural diagram of another DC-DC converter according to an embodiment of the present application is shown;
[0023] Figure 8 A schematic structural diagram of yet another DC-DC conversion device according to an embodiment of the present application is shown.
[0024] The above drawings include the following reference numerals:
[0025] 10. Power supply unit; 11. Pre-charging unit; 12. DC-DC converter; 100. Monitoring unit; 101. Insulation monitoring device; 200. First protection unit; 201. Protection module; 202. First pre-charging loop; 203. First voltage acquisition submodule; 204. Second voltage acquisition submodule; 205. First switch device; 206. Second switch device; 207. First impedance; 300. Isolation conversion unit; 301. Isolated DC-DC converter; 302. Third switch device; 400. Second protection unit; 401. Second pre-charging loop; 402. First voltage acquisition module; 403. Second voltage acquisition module; 404. Fourth switch device; 405. Fifth switch device; 406. Second impedance; 500. First current acquisition module; 501. Third impedance; 502. Fourth impedance; 503. Fifth impedance; 504. Sixth switch device; 505. Second current acquisition module. DETAILED DESCRIPTION
[0026] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.
[0027] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.
[0028] It should be understood that when an element (such as a layer, film, region, or substrate) is described as being "on" another element, the element may be directly on the other element, or there may be intermediate elements. Moreover, in the specification and claims, when an element is described as being "connected" to another element, the element may be "directly connected" to the other element, or "connected" to the other element through a third element.
[0029] The DC-DC converter in the prior art is as follows: Figure 1 As shown, it includes a power supply unit 10, a pre-charging unit 11 and a DC-DC converter 12 connected in sequence, wherein the power supply unit 10 includes multiple power supplies such as power supply 1, ..., power supply N, and the power supply 1 is electrically connected to the pre-charging unit 11 through the positive input (Vin1+) and the negative input (Vin1-), and the other power supplies are similar. The pre-charging unit 11 is electrically connected to the positive input (DC+) of the DC-DC converter 12 through the positive output (Vout1+), and the pre-charging unit 11 is electrically connected to the negative input (DC-) of the DC-DC converter 12 through the negative output (Vout1-). The positive output (V1+...VN+) of each DC-DC converter 12 is connected to the same DC bus, and the negative output (V1-...VN-) of each DC-DC converter 12 is connected to the same DC bus. Since multiple DC-DC converters are used in parallel, current influence is easily generated, resulting in low safety of the input side, output side and DC-DC converter in the DC-DC conversion device.
[0030] As introduced in the background technology, the safety of the DC-DC converter in the prior art is relatively low. In order to solve the above problem, the present application proposes a DC-DC converter.
[0031] Figure 2 Schematic diagram of the structure of a DC-DC converter according to an embodiment of the present application. Figure 2As shown, the DC-DC conversion device includes a monitoring unit 100, a first protection unit 200, an isolation conversion unit 300 and a second protection unit 400, wherein the input end of the monitoring unit 100 is the input end of the DC-DC conversion device, the output end of the monitoring unit 100 is electrically connected to the input end of the first protection unit 200, the output end of the first protection unit 200 is electrically connected to the input end of the isolation conversion unit 300, the output end of the isolation conversion unit 300 is electrically connected to the input end of the second protection unit 400, the output end of the second protection unit 400 is the output end of the DC-DC conversion device, the monitoring unit 100 is used to monitor the insulation performance of the input end of the DC-DC conversion device, the first protection unit 200 is used to perform pre-charging protection on the input end of the DC-DC conversion device, the isolation conversion unit 300 is used to electrically isolate the input end of the isolation conversion unit 300 and the output end of the isolation conversion unit 300, and the second protection unit 400 is used to perform pre-charging protection on the output end of the DC-DC conversion device.
[0032] Specifically, a DC-DC converter is a power electronic device used to convert a DC voltage value into another different DC voltage value. This conversion can occur at the same level (such as boost or buck) or between different levels. The main functions of a DC-DC converter include boost, buck and voltage stabilization. It is generally composed of a control chip, an inductor, a diode, a transistor, a capacitor, etc. It can store energy through high-frequency switching actions and use energy storage elements (such as inductors) to release energy to the load when the switch is disconnected. The monitoring unit can monitor the insulation resistance of the positive and negative busbars on the input side of the DC-DC converter to the casing of the DC-DC converter. In the event of a risk, an alarm signal is output to improve safety. The first protection unit implements pre-charge protection from the input side, and the second protection unit implements pre-charge protection from the output side. Whether the input side or the output side is connected to an energy storage battery, the safety of the DC-DC converter can be protected.
[0033] Through this embodiment, the DC-DC conversion device includes a monitoring unit, a first protection unit, an isolation conversion unit, and a second protection unit. The input end of the monitoring unit is the input end of the DC-DC conversion device, the output end of the monitoring unit is electrically connected to the input end of the first protection unit, the output end of the first protection unit is electrically connected to the input end of the isolation conversion unit, the output end of the isolation conversion unit is electrically connected to the input end of the second protection unit, and the output end of the second protection unit is the output end of the DC-DC conversion device. The monitoring unit is used to monitor the insulation performance of the input end of the DC-DC conversion device. The first protection unit is used to perform pre-charging protection on the input end of the DC-DC conversion device. The isolation conversion unit is used to electrically isolate the input end of the isolation conversion unit and the output end of the isolation conversion unit. The second protection unit is used to perform pre-charging protection on the output end of the DC-DC conversion device. The DC-DC conversion device realizes online monitoring of the insulation resistance value of the DC-DC conversion device through the monitoring unit, ensures that the DC-DC conversion device has good insulation performance, and improves safety. In addition, the first protection unit and the second protection unit can respectively realize the pre-charging protection function on both sides of the input end and the output end, which can also improve safety. Combining the monitoring unit, the first protection unit and the second unit can greatly improve the safety of the DC-DC converter, solving the problem of low safety of the DC-DC converter in the prior art.
[0034] In a specific embodiment, Figure 3 As shown, the DC-DC conversion device has multiple input channels (Vin-1, Vin-2, Vin-3), each of the input channels includes a positive input terminal (Vin1+, Vin2+, Vin3+) and a negative input terminal (Vin1-, Vin2-, Vin3-), the monitoring unit 100 includes multiple insulation monitoring devices 101, the insulation monitoring devices 101 correspond to the input channels one by one, the first end of each insulation monitoring device 101 is respectively the multiple positive input terminals, the second end of each insulation monitoring device 101 is respectively the multiple negative input terminals, the third end of each insulation monitoring device 101 is respectively grounded, and the insulation monitoring device 101 is used to monitor the insulation performance of the positive input terminal and the insulation performance of the negative input terminal. In addition, the connection relationship between the first protection unit 200, the isolation conversion unit 300, and the second protection unit 400 is as shown in FIG. Figure 3 In the case where the DC-DC converter has multiple input channels, this structure can further implement insulation monitoring of each input channel, thereby further improving safety.
[0035] Specifically, the above embodiment takes three input channels as an example, and the present application does not specifically limit the number of input channels, and the number of input channels may also be other than 3. The above insulation monitoring equipment may be an insulation resistance meter, a ground resistance tester, an online insulation monitoring system, a partial discharge detector, an insulation monitoring relay, a bridge insulation monitor, and a digital insulation monitor.
[0036] In order to further realize the pre-charge protection of the input side when the DC-DC converter has multiple input channels, Figure 4 As shown, the DC-DC conversion device has multiple input channels (Vin-1, Vin-2, Vin-3), each of the input channels includes a positive input terminal (Vin1+, Vin2+, Vin3+) and a negative input terminal (Vin1-, Vin2-, Vin3-), the first protection unit 200 includes multiple protection modules 201, the first end of each of the protection modules 201 is the multiple positive input terminals, the second end of each of the protection modules 201 is the multiple negative input terminals, each of the protection modules 201 includes a first pre-charge circuit 202, a first voltage acquisition submodule 203 and a second voltage acquisition submodule 204, the first pre-charge circuit The first end of the loop 202 is electrically connected to the first end of the first voltage acquisition submodule 203, the second end of the first pre-charge loop 202 is electrically connected to the first end of the second voltage acquisition submodule 204, the second end of the first voltage acquisition submodule 203, the second end of the second voltage acquisition submodule 204 and the negative input terminal are electrically connected, the first pre-charge loop 202 is used to pre-charge the output side device, the first voltage acquisition submodule 203 is used to collect the voltage of the input channel, the second voltage acquisition submodule 204 is used to collect the voltage of the input channel after pre-charging, and the input terminal of the output side device is electrically connected to the output terminal of the DC-DC conversion device. In addition, the connection relationship between the monitoring unit 100, the isolation conversion unit 300 and the second protection unit 400 is as shown in the figure. Figure 4 As shown, no further description is given here.
[0037] Specifically, the first voltage acquisition submodule acquires the voltage of the input channel, and the second voltage acquisition submodule acquires the voltage of the input channel after precharging, and by comparing it with the voltage acquired by the first voltage acquisition submodule, it can be determined whether the precharging is successful. The first voltage acquisition submodule and the second voltage acquisition submodule can adopt voltage acquisition devices such as data acquisition cards, data acquisition modules, digital multimeters, oscilloscopes, voltage data acquisition devices, multifunctional I / O devices, and voltage monitors.
[0038] In another embodiment, Figure 4As shown, the first pre-filling loop 202 includes a first switch device 205, a second switch device 206 and a first impedance 207, the first end of the first switch device 205 is electrically connected to the first end of the second switch device 206 and is the first end of the first pre-filling loop 202, the second end of the first switch device 205 is electrically connected to the first end of the first impedance 207, the second end of the first impedance 207 is electrically connected to the second end of the second switch device 206 and is the second end of the first pre-filling loop 202, and the first voltage acquisition submodule and the second voltage acquisition submodule 204 respectively include voltage acquisition devices. This structure can further simplify the circuit structure of the first pre-filling loop by using the first switch device, the second switch device and the first impedance to form the first pre-filling loop.
[0039] In practical applications, the first switch device is a pre-charging relay, which can be controlled to open and close to achieve pre-charging of components on the output side; the second switch device is the main positive relay, which can be controlled to open and close to cut the pre-charging circuit out of the busbar after pre-charging is completed; the first impedance is a pre-charging resistor, which is connected to the pre-charging circuit to increase impedance and reduce transient pre-charging current. When a storage battery is connected to the input side, the pre-charging relay in the first protection unit is closed first, and the instantaneous impact current of the circuit is reduced by the pre-charging resistor voltage divider, and then the main positive relay is closed and the pre-charging circuit is cut off to achieve the input side pre-charging protection function.
[0040] like Figure 5As shown, the DC-DC conversion device has a plurality of input channels (Vin-1, Vin-2, Vin-3) and an output channel, each of the input channels includes a positive input terminal (Vin1+, Vin2+, Vin3+) and a negative input terminal (Vin1-, Vin2-, Vin3-), and the output channel includes a positive output terminal (HVout+) and a negative output terminal (HVout-), and the isolation conversion unit 300 includes a plurality of isolation type DC-DC converters 301 and a plurality of third switching devices 302, and the isolation type DC-DC converters 301 are connected one by one with the input channels. The above-mentioned isolated DC-DC converters 301 correspond to the above-mentioned third switch devices 302 one by one, the first end of each of the above-mentioned isolated DC-DC converters 301 is respectively the plurality of the above-mentioned positive input ends, the second end of each of the above-mentioned isolated DC-DC converters 301 is respectively the plurality of the above-mentioned negative input ends, the third end of each of the above-mentioned isolated DC-DC converters 301 is respectively electrically connected to the positive ends of the plurality of the above-mentioned third switch devices 302, the negative end of each of the above-mentioned third switch devices 302 is respectively electrically connected to the above-mentioned positive output ends, and the fourth end of each of the above-mentioned isolated DC-DC converters 301 is respectively electrically connected to the above-mentioned negative output ends. In addition, the connection relationship between the above-mentioned monitoring unit 100, the above-mentioned first protection unit 200 and the second protection unit 400 is as follows: Figure 5 This structure can further ensure that each input is independent of each other, has good insulation performance, and prevents backflow, thereby protecting the input side.
[0041] Specifically, the isolated DC-DC converter can ensure that the inputs of each input channel are independent of each other and have good insulation performance. The third switch device can be a diode to prevent reverse flow on the output side, thereby protecting the input side.
[0042] In another embodiment, Figure 6As shown, the DC-DC conversion device has multiple input channels (Vin-1, Vin-2, Vin-3) and an output channel, each of the input channels includes a positive input terminal (Vin1+, Vin2+, Vin3+) and a negative input terminal (Vin1-, Vin2-, Vin3-), and the output channel includes a positive output terminal (HVout+) and a negative output terminal (HVout-), and the second protection unit 400 includes a second pre-charging loop 401, a first voltage acquisition module 402 and a second voltage acquisition module 403, wherein the first end of the second pre-charging loop 401 is connected to the first voltage acquisition module 403. 02, the second end of the second pre-charging loop 401 is electrically connected to the first end of the second voltage acquisition module 403 and is the positive output end, the second end of the first voltage acquisition module 402 is electrically connected to the second end of the second voltage acquisition module 403 and is the negative output end, the second pre-charging loop 401 is used to pre-charge the output side device, the first voltage acquisition module 402 is used to collect the voltage of the output channel after pre-charging, the second voltage acquisition module 403 is used to collect the voltage of the output channel, and the input end of the output side device is electrically connected to the output end of the DC-DC conversion device. In addition, the connection relationship between the monitoring unit 100, the first protection unit 200 and the isolation conversion unit 300 is as shown in the figure. Figure 6 This structure can further realize the pre-charge protection for the output side when the DC-DC converter has multiple input channels.
[0043] Specifically, the first voltage acquisition module acquires the voltage of the output channel after precharging, and the second voltage acquisition module acquires the voltage of the output channel. By comparing with the voltage acquired by the first voltage acquisition module, it can be determined whether the precharging is successful. The first voltage acquisition module and the second voltage acquisition module can adopt voltage acquisition devices such as data acquisition cards, data acquisition modules, digital multimeters, oscilloscopes, voltage data acquisition devices, multifunctional I / O devices, and voltage monitors.
[0044] like Figure 6As shown, the second pre-filling loop 401 includes a fourth switch device 404, a fifth switch device 405 and a second impedance 406, the first end of the fourth switch device 404 is electrically connected to the first end of the fifth switch device 405 and is the first end of the second pre-filling loop 401, the second end of the fourth switch device 404 is electrically connected to the first end of the second impedance 406, the second end of the second impedance 406 is electrically connected to the second end of the fifth switch device 405 and is the second end of the second pre-filling loop 401, and the first voltage acquisition module and the second voltage acquisition module respectively include voltage acquisition devices. This structure can further simplify the circuit structure of the second pre-filling loop by using the fourth switch device, the fifth switch device and the second impedance to form the second pre-filling loop.
[0045] Specifically, the fourth switch device is a pre-charging relay, and the pre-charging of the output side components can be achieved by controlling its opening and closing; the fifth switch device is the main positive relay, and the pre-charging circuit is cut out of the busbar by controlling its opening and closing after the pre-charging is completed; the second impedance is a pre-charging resistor, which is connected to the pre-charging circuit to increase the impedance and reduce the transient pre-charging current. When a storage battery is connected to the output side, the pre-charging relay in the second protection unit is closed first, and the instantaneous impact current of the circuit is reduced by the pre-charging resistor voltage divider, and then the main positive relay is closed, and the pre-charging circuit is cut off to achieve the output side pre-charging protection function.
[0046] like Figure 7 As shown, the DC-DC conversion device has multiple input channels (Vin-1, Vin-2, Vin-3) and an output channel, each of the input channels includes a positive input terminal (Vin1+, Vin2+, Vin3+) and a negative input terminal (Vin1-, Vin2-, Vin3-), and the output channel includes a positive output terminal (HVout+) and a negative output terminal (HVout-). The DC-DC conversion device also includes multiple first current acquisition modules 500 and multiple third impedances 501, wherein the first current acquisition modules 500 correspond to the positive input terminals one by one, and the third impedances 501 correspond to the input channels one by one. Each of the first current acquisition modules 500 is electrically connected to the multiple positive input terminals, the first end of each of the third impedances 501 is electrically connected to the multiple positive input terminals, and the second end of each of the third impedances 501 is electrically connected to the multiple negative input terminals. The first current acquisition module 500 is used to collect currents of the input channels. This structure can further improve the safety of the DC-DC converter.
[0047] Specifically, the first current acquisition module can use a current transformer to measure the input current in real time, detect the front-end output power and DC-DC output power, and automatically limit the output or cut off the circuit when the DC-DC detects that the current is too large. The third impedance can be a filter capacitor.
[0048] like Figure 8 As shown, the DC-DC converter has a plurality of input channels (Vin-1, Vin-2, Vin-3) and an output channel, each of the input channels includes a positive input terminal (Vin1+, Vin2+, Vin3+) and a negative input terminal (Vin1-, Vin2-, Vin3-), and the output channel includes a positive output terminal (HVout+) and a negative output terminal (HVout-). The DC-DC converter also includes a fourth impedance 502, a fifth impedance 503, and a sixth switch device 504. and a second current acquisition module 505, wherein the first end of the sixth switch device 504, the first end of the fifth impedance 503 and the positive output terminal are electrically connected, the second end of the sixth switch device 504 is electrically connected to the first end of the fourth impedance 502, the second end of the fourth impedance 502, the second end of the fifth impedance 503 and the negative output terminal are electrically connected, the second current acquisition module 505 is electrically connected to the positive output terminal, and the second current acquisition module 505 is used to collect the current of the output channel. This structure can further release the residual pressure of the output port.
[0049] Specifically, the second current acquisition module can use a current transformer to perform real-time output side current, detect the front-end output power and DC-DC output power, and automatically limit the output or cut off the circuit when the DC-DC detects that the current is too large. The sixth switch device is an output side discharge switch, which controls the closing of the switch to discharge the residual pressure of the output port capacitor. The fourth impedance is a discharge resistor, which is used to absorb the residual energy of the capacitor, and the fifth impedance is a discharge capacitor.
[0050] The DC-DC converter also includes a heat dissipation unit, which includes a water cooling pipeline, one end of which is a water inlet, and the other end of which is a water outlet. The heat dissipation unit is used to dissipate heat for the DC-DC converter. This structure can further achieve centralized water cooling of the DC-DC converter.
[0051] Specifically, after the above-mentioned monitoring unit, the first protection unit, the isolation conversion unit and the second protection unit are integrated, a water cooling pipeline is uniformly used to ensure temperature control under high-power operating conditions, avoid space waste caused by independent heat dissipation of a single module, and avoid the influence of air cooling design on the flow channel and IP level.
[0052] From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:
[0053] The DC-DC converter in the present application includes a monitoring unit, a first protection unit, an isolation conversion unit, and a second protection unit. The input end of the monitoring unit is the input end of the DC-DC converter, the output end of the monitoring unit is electrically connected to the input end of the first protection unit, the output end of the first protection unit is electrically connected to the input end of the isolation conversion unit, the output end of the isolation conversion unit is electrically connected to the input end of the second protection unit, and the output end of the second protection unit is the output end of the DC-DC converter. The monitoring unit is used to monitor the insulation performance of the input end of the DC-DC converter. The first protection unit is used to perform pre-charging protection on the input end of the DC-DC converter. The isolation conversion unit is used to electrically isolate the input end of the isolation conversion unit and the output end of the isolation conversion unit. The second protection unit is used to perform pre-charging protection on the output end of the DC-DC converter. The DC-DC converter realizes online monitoring of the insulation resistance of the DC-DC converter through the monitoring unit, ensures that the DC-DC converter has good insulation performance, and improves safety. In addition, the first protection unit and the second protection unit can respectively realize the pre-charging protection function on both sides of the input end and the output end, which can also improve safety. Combining the monitoring unit, the first protection unit and the second unit can greatly improve the safety of the DC-DC converter, solving the problem of low safety of the DC-DC converter in the prior art.
[0054] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A DC-DC converter, characterized in that: The invention comprises a monitoring unit, a first protection unit, an isolation conversion unit, and a second protection unit, wherein the input end of the monitoring unit is the input end of the DC-DC conversion device, the output end of the monitoring unit is electrically connected to the input end of the first protection unit, the output end of the first protection unit is electrically connected to the input end of the isolation conversion unit, the output end of the isolation conversion unit is electrically connected to the input end of the second protection unit, the output end of the second protection unit is the output end of the DC-DC conversion device, the monitoring unit is used to monitor the insulation performance of the input end of the DC-DC conversion device, the first protection unit is used to perform pre-charging protection on the input end of the DC-DC conversion device, the isolation conversion unit is used to electrically isolate the input end of the isolation conversion unit and the output end of the isolation conversion unit, and the second protection unit is used to perform pre-charging protection on the output end of the DC-DC conversion device.
2. The DC-DC converter according to claim 1, characterized in that: The DC-DC conversion device has multiple input channels, each of which includes a positive input terminal and a negative input terminal. The monitoring unit includes multiple insulation monitoring devices, and the insulation monitoring devices correspond to the input channels one by one. The first end of each insulation monitoring device is respectively the multiple positive input terminals, the second end of each insulation monitoring device is respectively the multiple negative input terminals, and the third end of each insulation monitoring device is respectively grounded. The insulation monitoring device is used to monitor the insulation performance of the positive input terminal and the insulation performance of the negative input terminal.
3. The DC-DC converter according to claim 2, characterized in that: The first protection unit includes multiple protection modules, the first end of each protection module is respectively a plurality of the positive input ends, the second end of each protection module is respectively a plurality of the negative input ends, each protection module includes a first pre-charging loop, a first voltage acquisition submodule and a second voltage acquisition submodule, the first end of the first pre-charging loop is electrically connected to the first end of the first voltage acquisition submodule, the second end of the first pre-charging loop is electrically connected to the first end of the second voltage acquisition submodule, the second end of the first voltage acquisition submodule, the second end of the second voltage acquisition submodule and the negative input end are electrically connected, the first pre-charging loop is used to pre-charge the output side device, the first voltage acquisition submodule is used to acquire the voltage of the input channel, the second voltage acquisition submodule is used to acquire the voltage of the input channel after pre-charging, and the input end of the output side device is electrically connected to the output end of the DC-DC conversion device.
4. The DC-DC converter according to claim 3, characterized in that: The first pre-charging loop includes a first switching device, a second switching device and a first impedance. The first end of the first switching device is electrically connected to the first end of the second switching device and is the first end of the first pre-charging loop. The second end of the first switching device is electrically connected to the first end of the first impedance. The second end of the first impedance is electrically connected to the second end of the second switching device and is the second end of the first pre-charging loop. The first voltage acquisition submodule and the second voltage acquisition submodule respectively include voltage acquisition devices.
5. The DC-DC converter according to claim 1, characterized in that: The DC-DC conversion device has multiple input channels and one output channel, the input channels include a positive input terminal and a negative input terminal, the output channels include a positive output terminal and a negative output terminal, the isolation conversion unit includes multiple isolated DC-DC converters and multiple third switch devices, the isolated DC-DC converters correspond to the input channels one by one, the isolated DC-DC converters correspond to the third switch devices one by one, the first end of each of the isolated DC-DC converters is respectively the multiple positive input terminals, the second end of each of the isolated DC-DC converters is respectively the multiple negative input terminals, the third end of each of the isolated DC-DC converters is respectively electrically connected to the positive terminals of the multiple third switch devices, the negative terminal of each of the third switch devices is respectively electrically connected to the positive output terminal, and the fourth end of each of the isolated DC-DC converters is respectively electrically connected to the negative output terminal.
6. The DC-DC converter according to claim 1, characterized in that: The DC-DC conversion device has an output channel, and the output channel includes a positive output terminal and a negative output terminal. The second protection unit includes a second pre-charging loop, a first voltage acquisition module and a second voltage acquisition module, wherein the first end of the second pre-charging loop is electrically connected to the first end of the first voltage acquisition module, the second end of the second pre-charging loop is electrically connected to the first end of the second voltage acquisition module and is the positive output terminal, the second end of the first voltage acquisition module is electrically connected to the second end of the second voltage acquisition module and is the negative output terminal, the second pre-charging loop is used to pre-charge the output side device, the first voltage acquisition module is used to collect the voltage of the output channel after pre-charging, the second voltage acquisition module is used to collect the voltage of the output channel, and the input end of the output side device is electrically connected to the output end of the DC-DC conversion device.
7. The DC-DC converter according to claim 6, characterized in that: The second pre-charging loop includes a fourth switching device, a fifth switching device and a second impedance. The first end of the fourth switching device is electrically connected to the first end of the fifth switching device and is the first end of the second pre-charging loop. The second end of the fourth switching device is electrically connected to the first end of the second impedance. The second end of the second impedance is electrically connected to the second end of the fifth switching device and is the second end of the second pre-charging loop. The first voltage acquisition module and the second voltage acquisition module respectively include voltage acquisition devices.
8. The DC-DC converter according to claim 1, characterized in that: The DC-DC conversion device has multiple input channels, each of which includes a positive input terminal and a negative input terminal. The DC-DC conversion device also includes multiple first current acquisition modules and multiple third impedances, wherein the first current acquisition modules correspond to the positive input terminals one by one, the third impedances correspond to the input channels one by one, each of the first current acquisition modules is electrically connected to the multiple positive input terminals, the first end of each of the third impedances is electrically connected to the multiple positive input terminals, the second end of each of the third impedances is electrically connected to the multiple negative input terminals, and the first current acquisition module is used to collect currents of the input channels.
9. The DC-DC converter according to claim 1, characterized in that: The DC-DC conversion device has an output channel, and the output channel includes a positive output terminal and a negative output terminal. The DC-DC conversion device also includes a fourth impedance, a fifth impedance, a sixth switch device and a second current acquisition module, wherein a first end of the sixth switch device, a first end of the fifth impedance and the positive output terminal are electrically connected, a second end of the sixth switch device is electrically connected to a first end of the fourth impedance, a second end of the fourth impedance, a second end of the fifth impedance and the negative output terminal are electrically connected, and the second current acquisition module is electrically connected to the positive output terminal, and the second current acquisition module is used to collect the current of the output channel.
10. The DC-DC converter according to claim 1, characterized in that: The DC-DC converter also includes a heat dissipation unit, which includes a water cooling pipeline, one end of which is a water inlet, and the other end of which is a water outlet. The heat dissipation unit is used to perform heat dissipation processing on the DC-DC converter.