Charging circuit, charging display system and charger

Abstract

The utility model discloses a charging circuit, a charging display system and a charger. The charging circuit comprises a voltage conversion circuit, a signal detection circuit, a switching circuit and a control module. The voltage conversion circuit is connected with the signal input end and the signal output end, receives the first voltage signal and outputs a second voltage signal; the signal detection circuit is connected with the voltage conversion circuit and the signal output end, detects the output state of the voltage conversion circuit and outputs a charging state signal; the first end of the switching circuit is connected with the voltage conversion circuit, and the second end of the switching circuit is connected with the display module; the control module is connected with the signal detection circuit and the switching circuit and is used for being connected with the display module, receiving the second voltage signal and the charging state signal, outputting the charging state parameter to the display module when outputting the switch conduction signal to the switching circuit, and outputting the charging state parameter to the display module only when the charging circuit performs normal charging; the display module can display the charging state of the charging circuit according to the charging state parameter, and the standby power consumption of the display module is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of charging, in particular to a charging circuit, a charging display system and a charger. Background Art

[0002] With the continuous development of the charger industry, research on energy-saving, high-efficiency and low-power chargers has made great progress. Chargers are widely used in daily life and industrial production, so most people are currently pursuing high-power miniaturized chargers to adapt to usage scenarios such as office, business trips and travel.

[0003] However, most chargers on the market now have no display module, which limits the user experience. The main reason is that adding a display module will bring additional standby power consumption, which is not conducive to environmental protection and cannot meet conventional energy efficiency requirements. Utility Model Content

[0004] The embodiments of the utility model provide a charging circuit, a charging display system and a charger to solve the problem that the existing charger has high standby power consumption after adding a display module.

[0005] A charging circuit comprises a voltage conversion circuit, a signal detection circuit, a switch circuit and a control module;

[0006] The voltage conversion circuit is connected to the signal input terminal and the signal output terminal, and is used to receive a first voltage signal and output a second voltage signal;

[0007] The signal detection circuit is connected to the voltage conversion circuit and the signal output terminal, and is used to detect the output state of the voltage conversion circuit and output a charging state signal;

[0008] The first end of the switch circuit is connected to the voltage conversion circuit, and the second end of the switch circuit is used to connect to the display module;

[0009] The control module is connected to the signal detection circuit and the switch circuit, and is used to connect to the display module, receive the second voltage signal and the charging status signal, and output the charging status parameter to the display module when outputting the switch conduction signal to the switch circuit.

[0010] Furthermore, the switch circuit includes a first switch tube;

[0011] The first end of the first switch tube is connected to the voltage conversion circuit, the second end of the first switch tube is connected to the display module, and the third end of the first switch tube is connected to the control module.

[0012] Furthermore, the first switch tube is a bipolar transistor;

[0013] The collector of the first switch tube is connected to the voltage conversion circuit, the emitter of the first switch tube is connected to the display module, and the base of the first switch tube is connected to the control module.

[0014] Further, the signal detection circuit includes a resistance circuit;

[0015] The first end of the resistance circuit is connected to the output end of the voltage conversion circuit, and the second end of the resistance circuit is connected to the signal output end;

[0016] The first input end of the control module is connected to the first end of the resistance circuit, and the second input end of the control module is connected to the second end of the resistance circuit.

[0017] Furthermore, the resistance circuit includes at least one detection resistor.

[0018] Furthermore, the signal output terminal includes a USB interface for connecting a load device;

[0019] The power output end of the USB interface is connected to the output positive electrode of the voltage conversion circuit and the voltage control end of the control module, and the ground end of the USB interface is connected to the second end of the detection resistor.

[0020] Further, the first data end of the USB interface is connected to the control module for transmitting the first data; the second data end of the USB interface is connected to the control module for transmitting the second data; the device identification end of the USB interface is connected to the control module for transmitting the device identification code;

[0021] The control module is used to receive the first data, the second data and the device identification code, and adjust the second voltage signal.

[0022] Further, the voltage conversion circuit includes an electromagnetic interference suppression circuit, an input rectification and filtering circuit, a transformer circuit and an output rectification and filtering circuit;

[0023] The electromagnetic interference suppression circuit is connected to the signal input terminal and is used to receive the first voltage signal output by the signal input terminal;

[0024] The input rectifier and filter circuit is connected to the electromagnetic interference suppression circuit, and is used to receive the first voltage signal and output a third voltage signal;

[0025] The transformer circuit is connected to the input rectifier and filter circuit, and is used to receive the third voltage signal and output a fourth voltage signal;

[0026] The output rectification and filtering circuit is connected to the transformer circuit, the switch circuit, the signal detection circuit and the signal output end, and is used for receiving the fourth voltage signal and outputting the second voltage signal.

[0027] A charging display system comprises a display module and the above-mentioned charging circuit, wherein the display module is connected to the second end of the switch circuit and the control module, and is used to receive the charging status parameter when the switch circuit is turned on, and display the charging status of the charging circuit according to the charging status parameter.

[0028] A charger comprises the above-mentioned charging display system.

[0029] The above-mentioned charging circuit, charging display system and charger, the charging circuit includes a voltage conversion circuit, a signal detection circuit, a switch circuit and a control module; the voltage conversion circuit is connected to the signal input end and the signal output end to receive a first voltage signal and output a second voltage signal; the signal detection circuit is connected to the voltage conversion circuit and the signal output end to detect the output state of the voltage conversion circuit and output a charging state signal; the first end of the switch circuit is connected to the voltage conversion circuit, and the second end of the switch circuit is used to be connected to the display module; the control module is connected to the signal detection circuit and the switch circuit, and is used to connect the display module, receive the second voltage signal and the charging state signal, and output the charging state parameter to the display module when outputting the switch conduction signal to the switch circuit, so that only when the charging circuit is charged normally, the switch conduction signal is output to the switch circuit to control the switch circuit to be turned on, so that the display module can display the charging state of the charging circuit according to the charging state parameter, thereby reducing the standby power consumption of the display module. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments of the utility model will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 This is a circuit diagram of a charging circuit in one embodiment of the utility model;

[0032] Figure 2 It is a circuit diagram of a charging display system in one embodiment of the utility model.

[0033] In the figure: 1. display module; 2. charging circuit; 21. voltage conversion circuit; 211. electromagnetic interference suppression circuit; 212. input rectification and filtering circuit; 213. transformer circuit; 214. output rectification and filtering circuit; 22. signal detection circuit; 23. switch circuit; 24. control module; 3. USB interface. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] It should be understood that the utility model can be implemented in different forms and should not be construed as being limited to the embodiments presented herein. On the contrary, providing these embodiments will make the disclosure thorough and complete, and fully convey the scope of the utility model to those skilled in the art. In the accompanying drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity. The same reference numerals throughout represent the same elements.

[0036] It should be understood that when an element or layer is referred to as being "on, adjacent to, connected to or coupled to other elements or layers, it may be directly on, adjacent to, connected to or coupled to other elements or layers, or there may be intervening elements or layers. On the contrary, when an element is referred to as being "directly on, directly adjacent to, directly connected to or directly coupled to other elements or layers, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present invention, the first element, component, region, layer or part discussed below may be represented as a second element, component, region, layer or part.

[0037] Spatially relative terms such as "under," "beneath," "below," "under," "above," "above," and the like may be used herein for ease of description to describe the relationship of an element or feature shown in the figures to other elements or features. It should be understood that the spatially relative terms are intended to include different orientations of the device in use and operation in addition to the orientations shown in the figures. For example, if the device in the accompanying drawings is flipped, then the elements or features described as "under other elements" or "under" or "under" will be oriented as "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or other orientations) and the spatial descriptors used herein are interpreted accordingly.

[0038] The purpose of the terms used herein is only to describe specific embodiments and is not intended to be a limitation of the present invention. When used herein, the singular forms "a", "an" and " / the" are also intended to include plural forms, unless the context clearly indicates another way. It should also be understood that the terms "consisting of" and / or "comprising", when used in this specification, determine the presence of features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0039] In order to thoroughly understand the present invention, detailed structures and steps will be presented in the following description to illustrate the technical solution proposed by the present invention. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other implementations.

[0040] This embodiment provides a charging circuit 2, which is used in a charger. Figure 2 As shown, the charger includes a charging display system, and the charging display system includes a display module 1 and the charging circuit 2. Exemplarily, the charger can be powered from an AC power grid or from other power supply devices, and charge the load device. In this embodiment, when the charger charges the load device through the charging circuit 2, the display module 1 can display the charging status in real time, and when the charging circuit 2 is not connected to the load, the standby power consumption of the display module 1 is reduced.

[0041] This embodiment provides a charging circuit 2, such as Figure 1As shown, it includes a voltage conversion circuit 21, a signal detection circuit 22, a switch circuit 23 and a control module 24; the voltage conversion circuit 21 is connected to the signal input end and the signal output end, and is used to receive a first voltage signal and output a second voltage signal; the signal detection circuit 22 is connected to the voltage conversion circuit 21 and the signal output end, and is used to detect the output state of the voltage conversion circuit 21 and output a charging state signal; the first end of the switch circuit 23 is connected to the voltage conversion circuit 21, and the second end of the switch circuit 23 is used to be connected to the display module 1; the control module 24 is connected to the signal detection circuit 22 and the switch circuit 23, and is used to connect to the display module 1, receive the second voltage signal and the charging state signal, and output the charging state parameter to the display module 1 when outputting the switch conduction signal to the switch circuit 23.

[0042] The signal input terminal is used to connect to a power supply network or other power supply equipment, and the signal output terminal is used to connect to a load device.

[0043] As an example, the voltage conversion circuit 21 is connected to the signal input terminal and the signal output terminal, and is used to receive a first voltage signal and output a second voltage signal. The first voltage signal refers to a voltage signal obtained from the signal input terminal. The second voltage signal refers to a voltage signal obtained after voltage conversion of the first voltage signal, and is used to be output from the signal output terminal.

[0044] As an example, the signal detection circuit 22 is connected to the voltage conversion circuit 21 and the signal output terminal, and is used to detect the output state of the voltage conversion circuit 21 and output a charging state signal. For example, the charging state signal is used to indicate whether there is a voltage drop or a charging current in the signal output path formed between the voltage conversion circuit 21 and the signal output terminal.

[0045] As an example, the first end of the switch circuit 23 is connected to the voltage conversion circuit 21, and the second end of the switch circuit 23 is used to connect to the display module 1; the control module 24 is connected to the signal detection circuit 22 and the switch circuit 23, and is used to connect to the display module 1, receive the second voltage signal and the charging state signal, and output the charging state parameter to the display module 1 when outputting the switch conduction signal to the switch circuit 23. In an application scenario, the control module 24 receives the second voltage signal, and judges whether there is an output voltage at the signal output end according to the second voltage signal, and judges whether there is a voltage drop or charging current in the signal output path formed between the voltage conversion circuit 21 and the signal output end through the charging state signal. When it is judged that there is an output voltage at the signal output end, and it is judged that there is a voltage drop or charging current in the signal output path formed between the voltage conversion circuit 21 and the signal output end, the charger is in a load state, and the switch conduction signal is output to the switch circuit 23 to control the switch circuit 23 to conduct. At this time, the voltage conversion circuit 21 supplies power to the display module 1. After the display module 1 starts normally, the charging state of the charging circuit 2 is displayed according to the charging state parameter output by the control module 24. When it is determined that there is an output voltage at the signal output terminal, and when it is determined that there is no voltage drop or charging current in the signal output path formed between the voltage conversion circuit 21 and the signal output terminal, it is determined that the charger is in a no-load state, and the output switch shutdown signal is sent to the switch circuit 23 to control the switch circuit 23 to shut down, thereby cutting off the display module 1 and avoiding the display module 1 from bringing additional standby power consumption.

[0046] In this embodiment, the charging circuit 2 includes a voltage conversion circuit 21, a signal detection circuit 22, a switch circuit 23 and a control module 24; the voltage conversion circuit 21 is connected to the signal input terminal and the signal output terminal to receive a first voltage signal and output a second voltage signal; the signal detection circuit 22 is connected to the voltage conversion circuit 21 and the signal output terminal to detect the output state of the voltage conversion circuit 21 and output a charging state signal; the first end of the switch circuit 23 is connected to the voltage conversion circuit 21, and the second end of the switch circuit 23 is used to be connected to the display module 1; the control module 24 is connected to the signal detection circuit 22 and the switch circuit 23, and is used to connect to the display module 1, receive the second voltage signal and the charging state signal, and output the charging state parameter to the display module 1 when outputting the switch conduction signal to the switch circuit 23, so that only when the charging circuit 2 is normally charged, the switch conduction signal is output to the switch circuit 23 to control the switch circuit 23 to be turned on, so that the display module 1 can display the charging state of the charging circuit 2 according to the charging state parameter, thereby reducing the standby power consumption of the display module 1.

[0047] In one embodiment, the switch circuit 23 includes a first switch tube; a first end of the first switch tube is connected to the voltage conversion circuit 21 , a second end of the first switch tube is connected to the display module 1 , and a third end of the first switch tube is connected to the control module 24 .

[0048] In this embodiment, by connecting the first end of the first switch tube to the voltage conversion circuit 21, connecting the second end of the first switch tube to the display module 1, and connecting the third end of the first switch tube to the control module 24, the control module 24 can control the first switch tube to be turned on or off by outputting a switch on signal or a switch off signal, thereby turning on or off the switch circuit 23.

[0049] In one embodiment, the first switch tube is a bipolar transistor; the collector of the first switch tube is connected to the voltage conversion circuit 21 , the emitter of the first switch tube is connected to the display module 1 , and the base of the first switch tube is connected to the control module 24 .

[0050] In this embodiment, using a bipolar transistor as the first switch tube can reduce circuit cost.

[0051] In one embodiment, the signal detection circuit 22 includes a resistance circuit; the first end of the resistance circuit is connected to the output end of the voltage conversion circuit 21, and the second end of the resistance circuit is connected to the signal output end; the first input end of the control module 24 is connected to the first end of the resistance circuit, and the second input end of the control module 24 is connected to the second end of the resistance circuit.

[0052] In this embodiment, the control module 24 can determine whether there is a voltage drop between the first end and the second end of the resistance circuit based on the voltage signal collected at the first input end and the voltage signal collected at the second input end, so that the control module 24 can determine whether the charging circuit 2 is in a no-load state, so that the control module 24 can control the switch circuit 23 to disconnect when the charging circuit 2 is in a no-load state, thereby reducing the power loss of the display module 1.

[0053] In one embodiment, the resistance circuit includes at least one detection resistor. In this embodiment, the resistance circuit may include one detection resistor, which is arranged in series between the first end and the second end of the resistance circuit, or the resistance circuit may include at least two detection resistors, which are arranged in series or in parallel between the first end and the second end of the resistance circuit, so as to detect whether there is a voltage drop or a charging current in the signal output path formed between the voltage conversion circuit 21 and the signal output end.

[0054] In one embodiment, the signal output end includes a USB (Universal Serial Bus, USB for short) interface for connecting a load device; the power output end of the USB interface 3 is connected to the output positive pole of the voltage conversion circuit 21 and the voltage control end of the control module 24, and the ground end of the USB interface 3 is connected to the second end of the detection resistor.

[0055] In this embodiment, the charging circuit 2 can be connected to the load device through the USB interface 3, so as to charge the load device through the USB interface 3, thereby improving the applicability and energy efficiency of the charger, and at the same time, data can be transmitted during the charging process, thereby improving the intelligence of the charging process.

[0056] In one embodiment, the first data end of the USB interface 3 is connected to the control module 24 for transmitting the first data; the second data end of the USB interface 3 is connected to the control module 24 for transmitting the second data; the device identification end of the USB interface 3 is connected to the control module 24 for transmitting the device identification code; the control module 24 is used to receive the first data, the second data and the device identification code, and adjust the second voltage signal.

[0057] The first data and the second data may be voltage data or current data.

[0058] In this embodiment, since different load devices may have different charging protocols, such as PD / PPS / QC protocols, the first data, the second data and the device identification code are received, and the second voltage signal is adjusted to adapt to different load devices, thereby improving the applicability of the charger.

[0059] In one embodiment, the voltage conversion circuit 21 includes an electromagnetic interference suppression circuit 211, an input rectifier filter circuit 212, a transformer circuit 213 and an output rectifier filter circuit 214; the electromagnetic interference suppression circuit 211 is connected to the signal input end and is used to receive the first voltage signal output from the signal input end; the input rectifier filter circuit 212 is connected to the electromagnetic interference suppression circuit 211 and is used to receive the first voltage signal and output the third voltage signal; the transformer circuit 213 is connected to the input rectifier filter circuit 212 and is used to receive the third voltage signal and output the fourth voltage signal; the output rectifier filter circuit 214 is connected to the transformer circuit 213, the switch circuit 23, the signal detection circuit 22 and the signal output end and is used to receive the fourth voltage signal and output the second voltage signal. In this embodiment, the electromagnetic interference during the operation of the charger is suppressed by the electromagnetic interference suppression circuit 211, and the voltage signal is rectified and filtered by the input rectifier filter circuit 212 and the output rectifier filter circuit 214 to ensure the reliability of the second voltage signal. It can be understood that when the switch circuit 23 is turned on, the display module 1 also needs to be powered based on the second voltage signal. Therefore, the voltage signal is rectified and filtered by the input rectifier filter circuit 212 and the output rectifier filter circuit 214 to ensure the reliability of the second voltage signal, so that the display module 1 can work stably. It should be noted that the specific circuit structure of the electromagnetic interference suppression circuit 211, the rectifier filter circuit, the transformer circuit 213 and the output rectifier filter circuit 214 can adopt the technology known to those skilled in the art, which will not be repeated here.

[0060] This embodiment provides a charging display system, such as Figure 2 As shown, it includes a display module 1 and the above-mentioned charging circuit 2, wherein the display module 1 is connected to the second end of the switch circuit 23 and the control module 24, and is used to receive the charging state parameter when the switch circuit 23 is turned on, and display the charging state of the charging circuit 2 according to the charging state parameter.

[0061] In this embodiment, the control module 24 can determine the output voltage according to the second voltage signal, can determine the output current according to the charging state signal, and generate the charging state parameter according to the output current and the output voltage, so that the display module 1 displays the corresponding output voltage and output current. Specifically, the control module 24 calculates the output current in real time according to the voltage drop across the resistor circuit and the resistance value presented by the resistor circuit.

[0062] This embodiment provides a charger, including the above-mentioned charging display system.

[0063] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention.

Claims

1. A charging circuit, characterized in that: It includes a voltage conversion circuit, a signal detection circuit, a switch circuit and a control module; The voltage conversion circuit is connected to the signal input terminal and the signal output terminal, and is used to receive the first voltage signal and output the second voltage signal; The signal detection circuit is connected to the voltage conversion circuit and the signal output terminal, and is used to detect the output state of the voltage conversion circuit and output a charging state signal; The first end of the switch circuit is connected to the voltage conversion circuit, and the second end of the switch circuit is used to connect to the display module; The control module is connected to the signal detection circuit and the switch circuit, and is used to connect to the display module, receive the second voltage signal and the charging status signal, and output the charging status parameter to the display module when outputting the switch conduction signal to the switch circuit.

2. The charging circuit according to claim 1, characterized in that: The switch circuit comprises a first switch tube; The first end of the first switch tube is connected to the voltage conversion circuit, the second end of the first switch tube is connected to the display module, and the third end of the first switch tube is connected to the control module.

3. The charging circuit according to claim 2, characterized in that: The first switch tube is a bipolar transistor; The collector of the first switch tube is connected to the voltage conversion circuit, the emitter of the first switch tube is connected to the display module, and the base of the first switch tube is connected to the control module.

4. The charging circuit according to claim 1, characterized in that: The signal detection circuit includes a resistance circuit; The first end of the resistance circuit is connected to the output end of the voltage conversion circuit, and the second end of the resistance circuit is connected to the signal output end; The first input end of the control module is connected to the first end of the resistance circuit, and the second input end of the control module is connected to the second end of the resistance circuit.

5. The charging circuit according to claim 4, characterized in that: The resistor circuit includes at least one detection resistor.

6. The charging circuit according to claim 5, characterized in that: The signal output terminal includes a USB interface for connecting a load device; The power output end of the USB interface is connected to the output positive electrode of the voltage conversion circuit and the voltage control end of the control module, and the ground end of the USB interface is connected to the second end of the detection resistor.

7. The charging circuit according to claim 6, characterized in that: The first data terminal of the USB interface is connected to the control module and is used to transmit the first data; the second data terminal of the USB interface is connected to the control module and is used to transmit the second data; the device identification terminal of the USB interface is connected to the control module and is used to transmit the device identification code; The control module is used to receive the first data, the second data and the device identification code, and adjust the second voltage signal.

8. The charging circuit according to claim 1, characterized in that: The voltage conversion circuit includes an electromagnetic interference suppression circuit, an input rectification and filtering circuit, a transformer circuit and an output rectification and filtering circuit; The electromagnetic interference suppression circuit is connected to the signal input terminal and is used to receive the first voltage signal output by the signal input terminal; The input rectifier and filter circuit is connected to the electromagnetic interference suppression circuit, and is used to receive the first voltage signal and output a third voltage signal; The transformer circuit is connected to the input rectifier and filter circuit, and is used to receive the third voltage signal and output a fourth voltage signal; The output rectification and filtering circuit is connected to the transformer circuit, the switch circuit, the signal detection circuit and the signal output end, and is used for receiving the fourth voltage signal and outputting the second voltage signal.

9. A charging display system, characterized in that: It comprises a display module and a charging circuit as described in any one of claims 1 to 8, wherein the display module is connected to the second end of the switch circuit and the control module, and is used to receive the charging status parameter when the switch circuit is turned on, and display the charging status of the charging circuit according to the charging status parameter.

10. A charger, characterized in that: Comprising the charging display system as claimed in claim 9.

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