CN112655145B - Power supply device and ultrasonic trolley - Google Patents
Power supply device and ultrasonic trolley Download PDFInfo
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- CN112655145B CN112655145B CN201880097226.4A CN201880097226A CN112655145B CN 112655145 B CN112655145 B CN 112655145B CN 201880097226 A CN201880097226 A CN 201880097226A CN 112655145 B CN112655145 B CN 112655145B
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- 238000002604 ultrasonography Methods 0.000 claims description 9
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- 238000005516 engineering process Methods 0.000 description 4
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
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Abstract
The utility model provides a power supply unit and supersound platform truck, includes multichannel parallelly connected power supply unit, and power supply unit passes through voltage converter to set for the power supply voltage of load all the way, and other way power supply unit pass through current converter and realize that the discharge current of each way battery equals for battery discharge does not depend on the electric quantity of battery, has solved supersound platform truck power supply electric quantity imbalance problem, has improved power supply system's reliability.
Description
Technical Field
The application relates to a power supply device and an ultrasonic trolley.
Background
Portable ultrasound (mainframe) is mainly used for POC (Point Of Care), anesthesia and physiotherapy, which requires that the portable ultrasound mainframe is light and thin and portable, and has long battery life. In order to meet the long-time endurance requirement, one application scenario of the portable ultrasonic host is to place the portable ultrasonic host on an ultrasonic table for charging and working.
The main functions of the ultrasonic trolley are as follows: the portable ultrasonic main machine has the functions of expanding a main machine probe, assisting in outputting by AC and supplying power for increasing the endurance of the portable ultrasonic main machine.
The technical principle of the ultrasonic trolley for supplying power to the portable ultrasonic host is shown in fig. 1, a plurality of parallel power supply circuits are arranged in the ultrasonic trolley and are connected into a voltage converter, and the voltage converter converts input voltage into voltage required by the portable ultrasonic host; each power supply circuit adopts a battery and supplies power to the voltage converter through a diode. Meanwhile, an alternating current-direct current circuit (AC-DC) can convert alternating current input through an external power grid into direct current and supply power to a voltage converter through a diode, and the direct current output by the alternating current-direct current circuit (AC-DC) can charge the batteries through a charger independently provided for each battery.
The existing battery powered systems have low life and reliability. Because the batteries are discharged in parallel through the diodes D1-Dn, the discharge current of the batteries depends on the voltage of the batteries, and because the electric quantity, the voltage and the internal resistance of each battery are different under the normal condition, the batteries with higher voltage in the circuit are mainly supplied with power by the voltage converter, the discharge current of each battery is unbalanced, some batteries are in a long-term overdischarge state, some batteries cannot be supplied with power for a long time, the utilization rate of a battery system is low, the duration time of an ultrasonic trolley is short, and the long-term power supply of the batteries has low service life due to the large bearing current of the whole system, so that the reliability of the system is reduced.
Summary of The Invention
Technical problem
In view of the above, the present application mainly provides a power supply device and an ultrasonic dolly.
Solution to the problem
Technical solution
In one embodiment, a first power supply device is provided, including multiple parallel power supply components:
the first path of power supply assembly of the multipath parallel power supply assembly comprises a first battery, a first voltage converter and a current sampler which are connected in series; the first voltage converter is used for transforming the input direct current to output direct current with preset voltage, and the current sampler is used for sampling the direct current output by the first voltage converter to obtain sampling current;
the second path power supply assembly of the multipath parallel power supply assembly comprises a second battery and a second current converter which are connected in series, and the control end of the second current converter is connected with the current sampler and is used for converting input and output direct current into direct current with the same size as the sampling current.
One embodiment also provides a power supply device comprising multiple parallel power supply components:
the first path of power supply assembly of the multipath parallel power supply assembly comprises a first battery and a first voltage converter which are connected in series; the first voltage converter is used for converting the input direct current into voltage so as to output direct current with preset voltage;
the second path power supply assembly of the multipath parallel power supply assembly comprises a second battery, a second current converter and a current sampler which are connected in series; the current sampler is used for sampling the direct current output by the second current converter to obtain sampling current; the current sampler is also connected with the control end of the first voltage converter, so that the first voltage converter controls the input and output direct current according to the sampling current.
In an embodiment, the third power supply assembly of the multiple parallel power supply assemblies includes a third battery and a third current transformer connected in series, and a control end of the third current transformer is connected with the current sampler and is used for transforming the input and output direct current into direct current with the same magnitude as the sampling current.
In an embodiment, a control end of the second current transformer is connected to the current sampler.
In an embodiment, the current sampler further includes a current amplifier for amplifying the sampled current and outputting the amplified sampled current.
In an embodiment, the power supply device further includes an ac-dc converter, which is used for accessing an ac power grid, converting ac power input by the ac power grid into dc power, and outputting the dc power.
In an embodiment, the first power supply assembly further includes a first charger configured to convert the dc power output by the ac-dc converter into dc power suitable for charging the first battery; the second power supply assembly further comprises a second charger for converting the direct current output by the alternating current-direct current converter into direct current suitable for charging a second battery.
In an embodiment, the third power supply assembly further includes a third charger for converting the dc power output by the ac-dc converter into dc power suitable for charging a third battery.
In an embodiment, the output end of the ac-dc converter is further connected to the input end of the first voltage converter; and/or the output end of the alternating current-direct current converter is also connected with the input end of the second current converter.
In an embodiment, the power supply device further includes a battery compartment for placing the first battery and the second battery.
According to a second aspect, an embodiment provides an ultrasound trolley comprising a power supply device as described in any of the embodiments above.
Advantageous effects of the application
Advantageous effects
According to the power supply device and the ultrasonic trolley, the power supply device comprises multiple paths of power supply assemblies which are connected in parallel, one path of power supply assembly is used for setting the power supply voltage for a load through the voltage converter, and the other paths of power supply assemblies are used for realizing equal discharge current of each path of battery through the current converter, so that the battery discharge is independent of the electric quantity of the battery, the problem of unbalanced power supply quantity of the ultrasonic trolley is solved, and the reliability of a power supply system is improved.
Brief description of the drawings
Drawings
FIG. 1 is a circuit principle path of a power supply system of an ultrasonic trolley for supplying power to a portable ultrasonic host;
FIG. 2 is a schematic structural view of an ultrasonic trolley of an embodiment;
FIG. 3 is a schematic circuit diagram of a power supply device including two power supply components according to an embodiment;
FIG. 4 is a schematic circuit diagram of a power supply device including more than two power supply components according to one embodiment;
FIG. 5 is a schematic diagram of another circuit of a power supply device including two power supply components according to one embodiment;
FIG. 6 is another circuit schematic of a power supply device including more than two power supply assemblies according to one embodiment;
FIG. 7 is a schematic circuit diagram of another embodiment of a power supply device including two power supply components;
FIG. 8 is a schematic circuit diagram of another embodiment of a power supply device including more than two power supply modules;
FIG. 9 is another schematic circuit diagram of another embodiment of a power supply device including a two-way power supply assembly;
FIG. 10 is another schematic circuit diagram of another embodiment of a power supply device including more than two power supply components;
FIG. 11 is a schematic circuit diagram for implementing a voltage converter;
fig. 12 is a schematic circuit diagram for implementing a current transformer.
Inventive examples
Embodiments of the application
Detailed Description
The application will be described in further detail below with reference to the drawings by means of specific embodiments. Wherein like elements in different embodiments are numbered alike in association. In the following embodiments, numerous specific details are set forth in order to provide a better understanding of the present application. However, one skilled in the art will readily recognize that some of the features may be omitted, or replaced by other elements, materials, or methods in different situations. In some instances, related operations of the present application have not been shown or described in the specification in order to avoid obscuring the core portions of the present application, and may be unnecessary to persons skilled in the art from a detailed description of the related operations, which may be presented in the description and general knowledge of one skilled in the art.
Furthermore, the described features, operations, or characteristics of the description may be combined in any suitable manner in various embodiments. Also, various steps or acts in the method descriptions may be interchanged or modified in a manner apparent to those of ordinary skill in the art. Thus, the various orders in the description and drawings are for clarity of description of only certain embodiments, and are not meant to be required orders unless otherwise indicated.
The numbering of the components itself, e.g. "first", "second", etc., is used herein merely to distinguish between the described objects and does not have any sequential or technical meaning. The term "coupled" as used herein includes both direct and indirect coupling (coupling), unless otherwise indicated.
In the battery power supply system in fig. 1, although the output voltages of the power supply circuits of each path are equal, that is, the voltage across the series circuit formed by the battery 1 and the diode D1, the voltage across the series circuit formed by the battery 2 and the diode D2, and the voltage across the series circuit formed by the battery n and the diode Dn are equal, they are the same, but because the electric quantity, the voltage, and the internal resistance of the battery in the power supply circuits of each path are generally different, this results in different currents of the power supply circuits of each path, and thus, the voltage drops of the diodes of each path are different, some are even reversed biased, and thus, the discharge voltages of the batteries of each path are different, some are not discharged.
In order to solve the problems, the inventor skillfully thinks that the batteries in one circuit pass through a voltage converter to make a set voltage for power supply, and the batteries in other circuits pass through a current converter respectively to make the power supply currents output by the circuits the same; however, this has a problem that the final output power supply voltage of each circuit may be different, which may not meet the voltage requirement of the load, so the inventors have continued to conceived that the output terminals of the circuits are connected together so that the output voltages of the circuits are all the same and equal to the voltage set by the voltage converter for power supply. Through the above conception, the voltages output by the circuits are the same and controllable (namely, the voltages can be set to required voltages), so that the requirements on the power supply voltage of a load are ensured, meanwhile, the discharge currents of the batteries are the same, the battery discharge is independent of the voltage of the battery, the problem of unbalanced electric quantity of an ultrasonic trolley power supply system is solved, the reliability of the system is improved, and the method is specifically described below.
Referring to fig. 2, an ultrasonic trolley is provided in an embodiment of the present application, and the ultrasonic trolley includes a power supply device. Referring to fig. 3, the power supply device of the ultrasonic trolley according to an embodiment may include multiple parallel power supply assemblies, for example, N parallel power supply assemblies, where N is an integer equal to or greater than 2.
A first one of the multiple parallel power supply components comprises a first battery 11, a first voltage converter 12 and a current sampler 40 in series. The first voltage converter 12 is used for transforming the input direct current to output direct current with a preset voltage. The current sampler 40 is configured to sample the dc power output by the first voltage converter 12 to obtain a sampled current.
The second power supply assembly of the multiple parallel power supply assemblies comprises a second battery 21 and a second current converter 22 which are connected in series, and a control end of the second current converter 22 is connected with a current sampler 40 and is used for converting the input and output direct current into direct current with the same magnitude as the sampling current. Therefore, the direct current input and output from the second current transformer 22 can be transformed into the direct current having the same magnitude as the sampling current by the second current transformer 22, and thus the direct currents output from the second battery 21 and the first battery 11 are equal. In addition, since the power supply components are connected in parallel, the output voltage of the second current transformer 22 is equal to the output voltage of the first voltage transformer 12, and the output voltage of the first voltage transformer 12 is controllable, that is, the first voltage transformer 12 transforms the input voltage to output a preset voltage, so that the output voltage of the whole power supply device is adjustable, for example, the output voltage is set according to the requirement of a load, and the discharge currents of the batteries are equal, for example, the discharge currents of the first battery 11 and the second battery 21 are equal.
In the above description of the two-way power supply assembly, it will be understood that when the power supply device includes three or more ways of power supply assemblies (i.e., N is 3 or an integer greater than 3), the power supply assembly from the third way may have the same structure and function as the second way power supply assembly, that is, may include a battery and a current transformer connected in series, where a controller of the current transformer is connected to the current sampler 40, and is configured to transform the input and output direct currents into direct currents having the same magnitude as the sampling current. Referring to fig. 4, for example, a third power supply unit of the multiple parallel power supply units in an embodiment includes a third battery 31 and a third current transformer 32 connected in series, and a control terminal of the third current transformer 32 is connected to a current sampler 40 for transforming the input and output dc power into dc power with the same magnitude as the sampled current. Similarly, the direct current input and output from the third current transformer 32 can be transformed into the direct current having the same magnitude as the sampling current by the third current transformer 32, so that the direct currents output from the third battery 31, the second battery 21, and the first battery 11 are equal; meanwhile, the third power supply assembly is in parallel connection with the first power supply assembly, so that the voltage output by the third power supply assembly is equal to the voltage output by the first power supply assembly. It should be noted that, the ellipses formed by the three black dots at the bottom in fig. 4 indicate that the multiple parallel power supply assemblies include three power supply assemblies, but may include more power supply assemblies, which are not shown for convenience of drawing.
In summary, it can be seen that when power is supplied to the load by the battery, the output voltages of the power supply modules connected in parallel in each path are equal, and the discharge currents of the battery in each path are also equal.
Referring to fig. 5, the power supply device of an embodiment may further include an ac-dc converter 50, where the ac-dc converter 50 is used for accessing an ac power grid, converting ac power input by the ac power grid into dc power and outputting the dc power. The dc power output by the ac-dc converter 50 may be used to charge a battery in each power supply assembly or may be used to power a load (e.g., a portable ultrasound host).
The following describes how the dc power output from the ac-dc converter 50 charges the batteries in each power supply module.
In one embodiment, each power module may include a charger for converting the dc power output from the ac to dc converter 50 into dc power suitable for charging the respective battery. For example, in one embodiment, the first power supply assembly further includes a first charger 13 for converting the dc power output by the ac-dc converter 50 into dc power suitable for charging the first battery 11; the second power supply assembly further includes a second charger 23 for converting the dc power output from the ac/dc converter 50 into dc power suitable for charging the second battery 21. Similarly, as can be appreciated, when the power supply device includes three or more power supply components (i.e. N is 3 or an integer greater than 3), the third power supply component further includes a third charger 33 for converting the dc power output from the ac/dc converter 50 into dc power suitable for charging the third battery 31, as shown in fig. 6. It should be noted that, the ellipses formed by the three black dots at the bottom in fig. 6 indicate that the multiple parallel power supply assemblies include three power supply assemblies, but may include more power supply assemblies, which are not shown for convenience of drawing.
The following describes how the dc power output by the ac-dc converter 50 may be used to power a load (e.g., a portable ultrasound host).
The outputs of the ac-dc converter 50 may be connected to the inputs of converters in one or more of the multiple parallel power supply modules, where the converters are referred to herein as voltage converters, such as the first voltage converter 12, and current converters, such as the second current converter 22 and the third current converter 32. Therefore, in one embodiment, the output terminal of the ac/dc converter 50 is further connected to the input terminal of the first voltage converter 12, and the first voltage converter 12 converts the input dc power into the dc power with the preset voltage and outputs the dc power. The output of the ac-dc converter 50 is also connected to the input of the second current transformer 22 in one embodiment, the second current transformer 22 transforming the input and output currents to be equal to the sampling current.
When the output end of the ac/dc converter 50 is connected to at least two paths of the power supply components, one path is the first path of the power supply component. In addition, when the output end of the ac/dc converter 50 is connected to at least two of the power supply modules, the current of each power supply module is reduced, and thus the heat generation is reduced, and the total heat loss is reduced, as compared with the case where the power supply module is connected to only one of the power supply modules. The output of the ac-dc converter 50 is thus connected to the input of the converter for all the paths in the power supply assembly.
It can be seen that when the ac-dc converter 50 is introduced to supply power to a load via the ac grid, the output voltages of the parallel power supply modules are equal and the currents of the parallel power supply modules are also equal.
The above is to sample the current from the voltage converter output and then the current converter controls the input and output currents based on the sampled current. Because the voltage converter has a certain current control function, in some embodiments, current can be sampled from the output of the current converter, and then the sampled current is input to the control end of the voltage converter as feedback current of the voltage converter, so that the voltage converter can regulate its own input and output current based on the sampled current. The following is a detailed description.
Referring to fig. 7, in an embodiment, the power supply device of the ultrasound trolley may include multiple parallel power supply assemblies, for example, N parallel power supply assemblies, where N is an integer equal to or greater than 2.
A first one of the multiple parallel power supply modules comprises a first battery 11 and a first voltage converter 12 in series. The first voltage converter 12 is used for transforming the input direct current to output direct current with a preset voltage.
The second of the multiple parallel power supply components comprises a second battery 21, a second current transformer 22 and a current sampler 40 in series. The current sampler 40 is configured to sample the direct current output by the second current transformer 22, to obtain a sampled current. The current sampler 40 is also connected to the control terminal of the first voltage converter 12 so that the first voltage converter 12 controls the input and output dc current according to the sampling current. The control terminal of the current transformer 22 may be connected to the current sampler 40 to receive the sampled current; or may not be connected to current sampler 40, i.e. not receive the sampled current.
With the above configuration, the voltages output from the first power supply unit and the second power supply unit can be made the same, and the discharge currents of the batteries of the two paths are substantially equal, for example, the discharge currents of the first battery 11 and the second battery 21 are substantially equal.
When the number of the electric components is three or more (i.e. N is 3 or an integer greater than 3), the power supply components from the third path have the same structure and function, i.e. may include a battery and a current transformer connected in series, and the controller of the current transformer is connected to the current sampler 40 and is used for transforming the input and output direct current into direct current with the same magnitude as the sampled current. Referring to fig. 8, for example, a third power supply unit of the multiple parallel power supply units in an embodiment includes a third battery 31 and a third current transformer 32 connected in series, and a control terminal of the third current transformer 32 is connected to a current sampler 40 for transforming the input and output dc power into dc power with the same magnitude as the sampled current. The dc power input and output from the third current transformer 32 can be transformed into the dc power having the same magnitude as the sampling current by the third current transformer 32, so that the discharge currents of the third battery 31 and the second battery 21 are equal, and at the same time, since the third power supply component is also in a parallel connection with the first power supply component, the voltage output from the third power supply component is also equal to the voltage output from the first power supply component. It should be noted that, the ellipses formed by the three black dots at the bottom in fig. 8 indicate that the multiple parallel power supply assemblies include three power supply assemblies, but may include more power supply assemblies, which are not shown for convenience of drawing.
In summary, it can be seen that when the load is supplied by the batteries, the output voltages of the parallel components are equal and the discharge currents of the batteries of the respective paths are also substantially equal, i.e. the discharge currents of the batteries of the second path to the nth path are all equal and approximately equal to the discharge current of the battery of the first path.
Referring to fig. 9, the power supply device of an embodiment may further include an ac-dc converter 50, where the ac-dc converter 50 is used for accessing an ac power grid, converting ac power input by the ac power grid into dc power and outputting the dc power. The dc power output by the ac-dc converter 50 may be used to charge a battery in each power supply assembly or may be used to power a load (e.g., a portable ultrasound host).
The following describes how the dc power output from the ac-dc converter 50 charges the batteries in each power supply module.
In one embodiment, each power module may include a charger for converting the dc power output from the ac to dc converter 50 into dc power suitable for charging the respective battery. For example, in one embodiment, the first power supply assembly further includes a first charger 13 for converting the dc power output by the ac-dc converter 50 into dc power suitable for charging the first battery 11; the second power supply assembly further includes a second charger 23 for converting the dc power output from the ac/dc converter 50 into dc power suitable for charging the second battery 21. Similarly, as can be appreciated, when the power supply device includes three or more power supply components (i.e. N is 3 or an integer greater than 3), for example, referring to fig. 10, the third power supply component further includes a third charger 33 for converting the dc power output from the ac/dc converter 50 into dc power suitable for charging the third battery 31. It should be noted that, the ellipses formed by the three black dots at the bottom in fig. 10 indicate that the multiple parallel power supply assemblies include three power supply assemblies, but may include more power supply assemblies, which are not shown for convenience of drawing.
The following describes how the dc power output by the ac-dc converter 50 may be used to power a load (e.g., a portable ultrasound host).
The outputs of the ac-dc converter 50 may be connected to the inputs of converters in one or more of the multiple parallel power supply modules, where the converters are referred to herein as voltage converters, such as the first voltage converter 12, and current converters, such as the second current converter 22 and the third current converter 32. Therefore, in one embodiment, the output terminal of the ac/dc converter 50 is further connected to the input terminal of the first voltage converter 12, and the first voltage converter 12 converts the input dc power into the dc power with the preset voltage and outputs the dc power. The output of the ac-dc converter 50 is also connected to the input of the second current transformer 22 in one embodiment, the second current transformer 22 transforming the input and output currents to be equal to the sampling current.
When the output end of the ac/dc converter 50 is connected to at least two of the power supply components, one of the power supply components is preferably the first power supply component. In addition, when the output end of the ac/dc converter 50 is connected to at least two of the power supply modules, the current of each power supply module is reduced, and thus the heat generation is reduced, and the total heat loss is reduced, as compared with the case where the power supply module is connected to only one of the power supply modules. Therefore, the output of the ac/dc converter 50 is preferably connected to the input of the converter for all paths in the power supply assembly.
It can be seen that when the ac-dc converter 50 is introduced to supply a load via the ac grid, the output voltages of the parallel power supply modules are equal, the currents of the parallel power supply modules are also substantially equal, i.e. the currents of the power supply modules from the second to the nth path are all equal, and approximately equal to the discharge current of the power supply module of the first path.
In order to make the current sharing effect better, in one embodiment, the current sampler 40 further includes a current amplifier for amplifying the sampled current and outputting the amplified sampled current. I.e. the current sampler 40 amplifies the sampled current and outputs it to the corresponding converter. The current sampler 40 in the present application may be a high-side current sampling or a low-side current sampling, and may be implemented by using a non-inductive sampling resistor, a hall current sensor, or the like.
The power supply device in one embodiment further comprises a battery compartment (not shown in the drawings) for placing batteries in the power supply assembly of each path, for example for placing the first battery 11 and the second battery 21, etc. By introducing the battery compartment, the power supply device supports free insertion and extraction of one or more batteries, and does not influence the work of power supply components of other paths, even if one path of batteries are damaged, the power supply device has no influence on the power supply components of other paths, so that the power supply reliability is improved.
It should be noted that, the voltage converter, for example, the first voltage converter 12, is used for transforming the input dc to output the dc with the preset voltage, and the implementation manner thereof may be various, and may be implemented by using the existing technology or the technology occurring in the future, so long as the function thereof is to transform the input dc to output the dc with the preset voltage. One implementation is given below.
An embodiment of the voltage converter, such as the first voltage converter 12, may be implemented by a circuit as shown in fig. 11, which is mainly implemented by a chip with a model LT8390 and is implemented in cooperation with a peripheral circuit in the drawing, where the FB pin of the chip LT8390 is used to control the voltage of the voltage converter, that is, to implement a dc power outputting a preset voltage, and the CTRL pin of the FB of the chip LT8390 is a control terminal of the voltage converter, such as a controller of the first voltage converter 12, and herein the CTRL pin implements a function of adjusting the input and output currents of the voltage converter by receiving the sampling current.
Likewise, the current transformers herein, e.g., the second current transformer 22 and the third current transformer 32, etc., may receive the sampling current through the control terminal to transform the input and output currents of themselves into the sampling current. The current transformer can be implemented in various ways, either by existing technologies or by technologies occurring in the future, so long as the function of the current transformer can be implemented by receiving the sampling current through the control terminal and transforming the input and output currents of the current transformer into the sampling current. One implementation is given below.
The current transformers of an embodiment, such as the second current transformer 22 and the third current transformer 32, can be implemented by a circuit as shown in fig. 12, which is mainly implemented by a chip with a model LT8390 and is implemented in cooperation with a peripheral circuit in the figure, wherein the CTRL pin of the FB of the chip LT8390 is a control terminal of the current transformer, such as a controller of the second current transformer 22 and the third current transformer 32, and the CTRL pin implements a function of adjusting the input and output currents of the current transformer to wait for the sampling current by receiving the sampling current.
In summary, the ultrasonic trolley and the power supply device thereof comprise multiple power supply assemblies connected in parallel, one power supply assembly sets the power supply voltage for a load through the voltage converter, and the other power supply assemblies realize equal discharge current of each path of battery through the current converter, so that the battery discharge does not depend on the electric quantity of the battery, the problem of unbalanced power supply electric quantity of the ultrasonic trolley is solved, and the reliability of a power supply system is improved.
The foregoing description of the application has been presented for purposes of illustration and description, and is not intended to be limiting. Variations of the above embodiments may be made by those of ordinary skill in the art in light of the present teachings.
Claims (15)
1. The utility model provides a power supply unit, includes multichannel parallelly connected power supply unit, its characterized in that:
the first path of power supply assembly of the multipath parallel power supply assembly comprises a first battery, a first voltage converter and a current sampler which are connected in series; the first voltage converter is used for transforming the input direct current to output direct current with preset voltage, and the current sampler is used for sampling the direct current output by the first voltage converter to obtain sampling current;
the second path power supply assembly of the multipath parallel power supply assembly comprises a second battery and a second current converter which are connected in series, and the control end of the second current converter is connected with the current sampler and is used for converting input and output direct current into direct current with the same size as the sampling current so that the direct current output by the first battery and the direct current output by the second battery are equal.
2. The utility model provides a power supply unit, includes multichannel parallelly connected power supply unit, its characterized in that:
the first path of power supply assembly of the multipath parallel power supply assembly comprises a first battery and a first voltage converter which are connected in series; the first voltage converter is used for converting the input direct current into voltage so as to output direct current with preset voltage;
the second path power supply assembly of the multipath parallel power supply assembly comprises a second battery, a second current converter and a current sampler which are connected in series; the current sampler is used for sampling the direct current output by the second current converter to obtain sampling current; the current sampler is also connected with the control end of the first voltage converter, so that the first voltage converter controls the input and output direct current according to the sampling current, and the direct current output by the first battery and the direct current output by the second battery are approximately equal.
3. The power supply device according to claim 1 or 2, wherein the third power supply assembly of the multiple parallel power supply assemblies comprises a third battery and a third current transformer connected in series, and a control end of the third current transformer is connected with the current sampler and is used for transforming the input and output direct current into direct current with the same magnitude as the sampling current.
4. The power supply of claim 2, wherein the control terminal of the second current transformer is connected to the current sampler.
5. The power supply apparatus as claimed in claim 1, 2 or 4, wherein the current sampler further comprises a current amplifier for amplifying the sampling current and outputting the amplified sampling current.
6. The power supply of claim 3, wherein the current sampler further comprises a current amplifier for amplifying the sampled current and outputting the amplified sampled current.
7. The power supply apparatus according to claim 1, 2 or 4, further comprising an ac-dc converter for switching in an ac power grid, converting ac power input from the ac power grid into dc power, and outputting the dc power.
8. A power supply apparatus according to claim 3, further comprising an ac-dc converter for connecting to an ac power grid, converting ac power input from the ac power grid into dc power, and outputting the dc power.
9. The power supply of claim 7, wherein the first power supply assembly further comprises a first charger for converting the dc power output by the ac-dc converter to dc power suitable for charging the first battery; the second power supply assembly further comprises a second charger for converting the direct current output by the alternating current-direct current converter into direct current suitable for charging a second battery.
10. The power supply of claim 8, wherein the first power supply assembly further comprises a first charger for converting the dc power output by the ac-dc converter to dc power suitable for charging the first battery; the second power supply assembly further comprises a second charger for converting the direct current output by the alternating current-direct current converter into direct current suitable for charging a second battery.
11. The power supply of claim 10, wherein the third power supply assembly further comprises a third charger for converting the dc power output by the ac-dc converter to dc power suitable for charging a third battery.
12. The power supply of claim 7, wherein the output of the ac-dc converter is further connected to the input of the first voltage converter; and/or the output end of the alternating current-direct current converter is also connected with the input end of the second current converter.
13. The power supply of claim 8, wherein the output of the ac-dc converter is further connected to the input of the first voltage converter; and/or the output end of the alternating current-direct current converter is also connected with the input end of the second current converter.
14. The power supply device according to claim 1 or 2, further comprising a battery compartment for housing the first and second batteries.
15. An ultrasound trolley comprising the power supply device of any one of claims 1 to 14.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2018/116218 WO2020102942A1 (en) | 2018-11-19 | 2018-11-19 | Power supply device and ultrasonic trolley |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112655145A CN112655145A (en) | 2021-04-13 |
| CN112655145B true CN112655145B (en) | 2023-12-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201880097226.4A Active CN112655145B (en) | 2018-11-19 | 2018-11-19 | Power supply device and ultrasonic trolley |
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| Country | Link |
|---|---|
| CN (1) | CN112655145B (en) |
| WO (1) | WO2020102942A1 (en) |
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| WO2020102942A1 (en) | 2020-05-28 |
| CN112655145A (en) | 2021-04-13 |
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