High-frequency charging device

Abstract

The utility model provides high-frequency charging equipment, and the equipment comprises an input rectification filtering module which is used for converting an input alternating current into a smooth direct current; the input end of the power factor correction module is connected to the output end of the input rectification filtering module; the high-frequency voltage transformation module comprises a high-voltage end, a first low-voltage end and a second low-voltage end, and the high-voltage end is connected to the output end of the power factor correction module; the first end of the first change-over switch is connected to the first low-voltage end of the high-frequency voltage transformation module; the first end of the second change-over switch is connected to the second low-voltage end of the high-frequency voltage transformation module; and the input end of the output module is connected to the second end of the first change-over switch and the second end of the second change-over switch, and the output end of the output module is configured to be connected to charged equipment. The high-low voltage switching circuit is simple in structure and convenient to implement, energy consumption is reduced, and electric energy waste is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of charging equipment, in particular to a high-frequency charging equipment. BACKGROUND

[0002] The high-frequency charging equipment is a device for converting and charging electric energy by using high-frequency alternating current signals. Compared with low-frequency charging equipment, the high-frequency charging equipment has a higher working frequency and higher energy conversion efficiency, which can effectively reduce energy loss. With its efficient energy conversion and flexible control method, the high-frequency charging equipment can provide higher charging power, thereby speeding up the charging speed. The existing high-frequency charging equipment generally adopts a fixed gear charging method or is provided with a relatively complex gear voltage switching circuit, resulting in a complex structure of the high-frequency charging equipment and an inability to obtain a smaller size. CONTENT OF THE UTILITY MODEL

[0003] In view of the problems in the prior art, the purpose of the present application is to provide a high-frequency charging equipment, a high-low voltage switching circuit with simple structure and easy implementation, which reduces energy consumption and avoids waste of electric energy.

[0004] The present application provides a high-frequency charging equipment, comprising:

[0005] An input rectification and filtering module is configured to convert input alternating current into smooth direct current.

[0006] A power factor correction module is connected to the output end of the input rectification and filtering module.

[0007] A high-frequency transformer module includes a high-voltage end, a first low-voltage end, and a second low-voltage end. The high-voltage end is connected to the output end of the power factor correction module.

[0008] A first switching switch has a first end connected to the first low-voltage end of the high-frequency transformer module.

[0009] A second switching switch has a first end connected to the second low-voltage end of the high-frequency transformer module.

[0010] An output module has input ends connected to the second ends of the first and second switching switches, respectively. The output module has an output end configured to be connected to a charged device.

[0011] In some embodiments, the high-frequency transformer module includes a high-frequency transformer. The high-voltage end is connected to the primary winding of the high-frequency transformer. The first and second low-voltage ends are connected to the secondary winding of the high-frequency transformer.

[0012] In some embodiments, an internal power module is further included for supplying power to internal modules of the charging device, an input of the internal power module is connected to an output of the power factor correction module.

[0013] In some embodiments, the output module includes an output rectifier module and an output switch module, inputs of the output rectifier module are connected to the second end of the first switch and the second end of the second switch respectively, an output of the output rectifier module is connected to an input of the output switch module, and an output of the output switch module is configured to be connected to the device to be charged.

[0014] In some embodiments, a control module is further included for outputting a switching control signal for controlling the first switch and the second switch and an output switch control signal for controlling the output switch module.

[0015] In some embodiments, the control module is further configured to output a PWM signal for controlling the power factor correction module, the power factor correction module includes a first resistor, a second resistor, a first power switching device and a second power switching device, a first PWM signal output of the control module is connected to the first power switching device through the first resistor, and a second PWM signal output of the control module is connected to the second power switching device through the second resistor.

[0016] In some embodiments, the first switch is a first relay and the second switch is a second relay, a first end of an electromagnetic coil of the first relay and a first end of an electromagnetic coil of the second relay are configured to input the power supply, a second end of the electromagnetic coil of the first relay and a second end of the electromagnetic coil of the second relay are respectively connected to a switching transistor, and a control end of the switching transistor is configured to input the switching control signal.

[0017] In some embodiments, an output sampling module is further included for collecting charging parameters and sending the charging parameters to the control module.

[0018] In some embodiments, the output sampling module includes a third resistor and a fourth resistor, the third resistor and the fourth resistor are connected in series between an output end of the output switch module and a ground end, and a midpoint of the third resistor and the fourth resistor is connected to a sampling signal input end of the control module.

[0019] The high-frequency charging device provided in the application has the following advantages:

[0020] The high-low voltage switching circuit provided in the application has a simple structure and is easy to implement, different low-voltage ends of the high-frequency transformer module are connected to the output module through the switching switch, the switching of different voltage gears is realized, the maximum duty cycle is ensured in different voltage gears, the highest conversion efficiency output is achieved in different voltage gears, the temperature of the charging device itself is reduced, the charging efficiency is improved, the energy consumption is reduced and the energy is saved, and the waste of electric energy is effectively avoided. Attached Figure Description

[0021] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0022] Figure 1 This is a structural block diagram of a high-frequency charging device according to an embodiment of this application;

[0023] Figure 2 This is a detailed structural block diagram of a high-frequency charging device according to an embodiment of this application;

[0024] Figure 3 This is a circuit diagram of a high-frequency charging device according to an embodiment of this application. Detailed Implementation

[0025] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this application will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore repeated descriptions of them will be omitted. The words “or” and “or” in the specification may mean “and” or “or”. Although the terms “upper,” “lower,” “between,” etc., may be used in this specification to describe different exemplary features and elements of this application, these terms are used herein only for convenience, such as the orientation according to the examples described in the accompanying drawings. Nothing in this specification should be construed as requiring a specific three-dimensional orientation of the structure to fall within the scope of this application. Although “first” or “second,” etc., are used in this specification to denote certain features, they are merely indicative of function and not as a limitation on the number or importance of specific features.

[0026] like Figure 1 As shown, this application provides a high-frequency charging device, including:

[0027] The input rectifier and filter module 101 is used to convert the input AC power into smooth DC power; the input AC power is, for example, AC mains power.

[0028] The power factor correction module 102 has its input terminal connected to the output terminal of the input rectifier filter module 101. This power factor correction (PFC) module 102 is used to correct input current harmonics and improve the power factor and grid utilization.

[0029] The high-frequency transformer module 104 includes a high-voltage end, a first low-voltage end and a second low-voltage end, and the high-voltage end is connected to the output end of the power factor correction module 102; the high-frequency transformer module is used for DC-DC isolation conversion output, and cooperates with the first switching switch 105 and the second switching switch 106 to convert output voltage;

[0030] The first switching switch 105 has a first end connected to the first low-voltage end of the high-frequency transformer module 104.

[0031] The second switching switch 106 has a first end connected to the second low-voltage end of the high-frequency transformer module 104.

[0032] The output module has input ends connected to the second end of the first switching switch 105 and the second end of the second switching switch 106 respectively, and an output end configured to be connected to a charged device, and is used for controlling a charging output process to the charged device. The charged device is, for example, a battery module or other types of loads.

[0033] The application provides a high-low voltage switching circuit which is simple in structure and easy to implement. Different low-voltage ends of the high-frequency transformer module are connected to the output module through the switching switch to realize switching of different voltage gears, ensure working at the maximum duty ratio in different voltage gears, meet the highest conversion efficiency output in different voltage gears, reduce the temperature of the charging device itself, improve the charging efficiency, reduce energy consumption, save energy, and effectively avoid energy waste. The switching switch is arranged on the low-voltage side of the high-frequency transformer module in the application, the voltage flowing through the switching switch is small, the requirement for the switching switch is not high, and the transformer module is a high-frequency transformer module, the output of which is also a high-frequency low-voltage signal. The switching switch is arranged on the low-voltage end, and the stability of the charging process is not easily affected in the switching process. The output voltage and current of the high-frequency transformer module can be adjusted by controlling the PWM signal of the input power factor correction module, and the winding efficiency of the high-frequency transformer module is further improved by providing the switching switch for high-low voltage switching. The PWM signal control and the switching switch control are combined to effectively reduce energy consumption and avoid energy waste.

[0034] In the embodiment, the high-frequency transformer module 104 includes a high-frequency transformer, the high-voltage end is connected to the primary winding of the high-frequency transformer, and the first low-voltage end and the second low-voltage end are connected to the secondary winding of the high-frequency transformer. Taking the high-frequency charging device which can realize 12V and 24V output voltages as an example, the first switching switch 105 is a 12V switching switch, and the second switching switch 106 is a 24V switching switch. The first switching switch 105 transmits the 12V output winding of the high-frequency transformer to the output module, and the second switching switch 106 transmits the 24V output winding of the high-frequency transformer to the output module.

[0035] Figure 2 is a detailed structure block diagram of the high-frequency charging device of an embodiment of the present application. As shown in Figure 2 the high-frequency charging device further comprises an internal power module 103 for supplying power to internal modules of the charging device, an input end of the internal power module 103 being connected to an output end of the power factor correction module 102. The output module comprises an output rectification module 107 and an output switch module 108, an input end of the output rectification module 107 being respectively connected to a second end of the first switch 105 and a second end of the second switch 106, an output end of the output rectification module 107 being connected to an input end of the output switch module 108, and an output end of the output switch module 108 being configured to be connected to a device to be charged. The output rectification module 107 is used to rectify and filter the high-frequency power transmitted by the first switch 105 or the second switch 106 and output it externally. The output switch module 108 is used to control the charging switch of the device to be charged.

[0036] As shown in Figure 2 , the high-frequency charging device further comprises a control module 110 and an output sampling module 109. The control module 110 is used to output a switching control signal for controlling the first switch 105 and the second switch 106 and an output switch control signal for controlling the output switch module 108. The control module 110 is also used to output a PWM signal for controlling the power factor correction module. The output sampling module 109 is used to collect charging parameters and send them to the control module 110. The charging parameters are, for example, charging voltage and / or charging current. The control module 110 can be realized by an intelligent chip, and by configuration, it is realized to automatically select whether to turn on the first switch 105 or the second switch 106 according to the charging parameters. For example, when the high-frequency charging device is used, first, it is judged which gear is selected by the user, if it is the 12V gear, the first switch 105 is selected to be turned on, if it is the 24V gear, the second switch 106 is selected to be turned on, and if the clip is reversed, an error is reported and the current process is ended. During the charging process in the 12V gear or the 24V gear, the control module 110 also collects the charging parameters in real time through the output sampling module 109, judges whether the charging is completed according to the charging parameters, if the charging is overtime, an error is reported and the current process is ended, and if the charging is completed, the charging is ended and a full charge information is displayed. During the charging process, the control module 110 can also judge whether different switches need to be switched according to the charging parameters, automatically and seamlessly switch the winding turns ratio output of the transformer, ensure that the conversion efficiency of each voltage gear can reach the highest, meet the energy consumption requirements, and make the entire charging curve smooth and effective, effectively solving the shortcomings of low efficiency and high temperature rise of the existing charging device.

[0037] Figure 3 is a circuit schematic diagram of the high-frequency charging device of an embodiment of the present application. As shown in Figure 3As shown, the input rectification filter circuit includes a rectification bridge DB1 and a capacitor C1. The power factor correction module includes a first resistor R5, a second resistor R6, a first power switch Q1 and a second power switch Q2. The control module is implemented by an MCU. The first PWM (Pulse-Width Modulation) signal output end of the control module is connected to the first power switch Q1 through the first resistor R5, and the second PWM signal output end of the control module is connected to the second power switch Q2 through the second resistor R6. The high-frequency transformer module includes an inductor L1 and a high-frequency transformer TR1. The left side of the high-frequency transformer TR1 is the primary side, i.e. the high-voltage side, and the right side is the secondary side, i.e. the low-voltage side. The output rectification module includes diodes D1 and D2 and a capacitor C3. The output switch module includes resistors R1 and R2, a power switch Q3 and a switch transistor Q7. The output switch control signal of the control module is input to the control end of the switch transistor Q7 through the resistor R2.

[0038] As shown in Figure 3 The first switch is a first relay K1, and the second switch is a second relay K2. The first end of the electromagnetic coil of the first relay K1 and the first end of the electromagnetic coil of the second relay K2 are used to input a 12V power supply. The second end of the electromagnetic coil of the first relay K1 and the second end of the electromagnetic coil of the second relay K2 are respectively connected to a switch transistor Q19. The control end of the switch transistor Q19 inputs a switching control signal of the control module through a resistor R115.

[0039] As shown in Figure 3 The output sampling module includes a third resistor R3 and a fourth resistor R4. The third resistor R3 and the fourth resistor R4 are connected in series between the output end and the ground end of the output switch module. The midpoint of the third resistor R3 and the fourth resistor R4 is connected to the sampling signal input end of the control module.

[0040] The above is a further detailed description of the present application in combination with specific preferred embodiments, and cannot be regarded as limiting the specific implementation of the present application to these descriptions. For ordinary skilled persons in the technical field to which the present application belongs, some simple deductions or replacements can be made without departing from the concept of the present application, and all of them should be regarded as falling within the protection scope of the present application.

Claims

1. A high-frequency charging apparatus characterized by comprising: The application relates to a charging device, which comprises the following parts: an input rectification filter module for converting input alternating current into smooth direct current; a power factor correction module, the input end of which is connected to the output end of the input rectification filter module; a high-frequency transformer module, which comprises a high-voltage end, a first low-voltage end and a second low-voltage end, the high-voltage end being connected to the output end of the power factor correction module; a first switching switch, the first end of which is connected to the first low-voltage end of the high-frequency transformer module; a second switching switch, the first end of which is connected to the second low-voltage end of the high-frequency transformer module; an output module, the input ends of which are respectively connected to the second end of the first switching switch and the second end of the second switching switch, and the output end of which is configured to be connected to a charging device.

2. The high-frequency charging apparatus according to claim 1, characterized by The high-frequency transformer module comprises a high-frequency transformer, the high-voltage end being connected to the primary winding of the high-frequency transformer, and the first low-voltage end and the second low-voltage end being connected to the secondary winding of the high-frequency transformer.

3. The high-frequency charging apparatus according to claim 1, wherein The application further comprises an internal power module for supplying power to the internal module of the charging device, the input end of the internal power module being connected to the output end of the power factor correction module.

4. The high-frequency charging apparatus according to claim 1, wherein The output module comprises an output rectification module and an output switch module, the input ends of the output rectification module being respectively connected to the second end of the first switching switch and the second end of the second switching switch, the output end of the output rectification module being connected to the input end of the output switch module, and the output end of the output switch module being configured to be connected to the charging device.

5. The high-frequency charging apparatus according to claim 4, characterized by The application further comprises a control module for outputting switching control signals for controlling the first switching switch and the second switching switch and output switch control signals for controlling the output switch module.

6. The high-frequency charging apparatus according to claim 5, characterized by The control module is further used for outputting PWM signals for controlling the power factor correction module, the power factor correction module comprising a first resistor, a second resistor, a first power switching device and a second power switching device, the first PWM signal output end of the control module being connected to the first power switching device through the first resistor, and the second PWM signal output end of the control module being connected to the second power switching device through the second resistor.

7. The high-frequency charging apparatus according to claim 5, wherein The first switching switch is a first relay, and the second switching switch is a second relay, the first end of the electromagnetic coil of the first relay and the first end of the electromagnetic coil of the second relay being used for inputting power, the second end of the electromagnetic coil of the first relay and the second end of the electromagnetic coil of the second relay being respectively connected to a switching transistor, and the control end of the switching transistor being inputted with the switching control signals.

8. The high-frequency charging apparatus according to claim 5, wherein The application further comprises an output sampling module, which is used for collecting charging parameters and sending the charging parameters to the control module.

9. The high-frequency charging apparatus according to claim 8, characterized by The output sampling module comprises a third resistor and a fourth resistor, the third resistor and the fourth resistor being connected in series between the output end of the output switch module and the ground end, and the midpoint of the third resistor and the fourth resistor being connected to the sampling signal input end of the control module.

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