CN221328647U - Transformer module, charging circuit and charger - Google Patents
Transformer module, charging circuit and charger Download PDFInfo
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- CN221328647U CN221328647U CN202322975874.6U CN202322975874U CN221328647U CN 221328647 U CN221328647 U CN 221328647U CN 202322975874 U CN202322975874 U CN 202322975874U CN 221328647 U CN221328647 U CN 221328647U
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Abstract
The utility model discloses a transformer module, a charging circuit and a charger, which comprise a transformer and a transformer control circuit; the primary winding of the transformer is used for being connected with the rectification module, and the secondary winding of the transformer is used for being connected with the secondary rectification filter module; the first end of the transformer control circuit is connected with the primary winding of the transformer, and the second end of the transformer control circuit is connected with a connection node between the rectifying module and the transformer; the transformer control circuit comprises an induction circuit, and is used for adjusting the output power of the transformer according to induction information detected by the induction circuit. The transformer module can automatically adjust output power at the transformer end according to the induction information, and is beneficial to simplifying a protocol control circuit and saving development cost of a charger when the transformer module is applied to a charging circuit.
Description
Technical Field
The utility model relates to the technical field of chargers, in particular to a transformer module, a charging circuit and a charger.
Background
With the progress of science and technology, the battery capacity of the device is larger and larger, and the charging speed requirement of people on mobile phones is higher and higher. In order to meet the battery health requirement of the device, the existing fast charging scheme generally performs high-power charging within a few minutes after starting charging, so that the electric quantity of the device rapidly rises to a more sufficient state, and then the state is changed into low-power trickle charging. To achieve this charging effect, the charger is typically designed for peak power output, followed by a power reduction. The current mode for realizing power reduction in industry is to detect the characteristics of output voltage, current, temperature and the like through a protocol chip, and when the characteristics reach a set threshold value, the charging power of a charger is reduced, a control circuit is complex, and the development cost is high.
Disclosure of utility model
The embodiment of the utility model provides a transformer module, a charging circuit and a charger, which are used for solving the problem that the existing charging circuit is complex in control circuit.
The embodiment of the utility model provides a transformer module, which comprises a transformer and a transformer control circuit;
The primary winding of the transformer is used for being connected with the rectification module, and the secondary winding of the transformer is used for being connected with the secondary rectification filter module;
The first end of the transformer control circuit is connected with the primary winding of the transformer, and the second end of the transformer control circuit is connected with a connection node between the rectifying module and the transformer;
The transformer control circuit comprises an induction circuit, and is used for adjusting the output power of the transformer according to induction information detected by the induction circuit.
Preferably, the transformer control circuit comprises a main control chip and a control tube;
The first end of the control tube is connected with the primary winding of the transformer, the second end of the control tube is connected with the driving pin of the main control chip, and the third end of the control tube is grounded;
the main control chip is connected with the induction circuit and is used for adjusting the duty ratio or the working frequency of the PWM signal output by the driving pin according to the induction information detected by the induction circuit and adjusting the output power of the transformer.
Preferably, the sensing circuit includes a temperature detecting unit, and the transformer control circuit is configured to adjust the output power of the transformer according to the measured temperature detected by the temperature detecting unit.
Preferably, the temperature detection unit comprises a thermistor, wherein a first end of the thermistor is connected with an over-temperature protection pin of the main control chip, and a second end of the thermistor is grounded.
Preferably, the induction circuit comprises a timing unit, and the transformer control circuit is used for adjusting the output power of the transformer according to the charging time detected by the timing unit.
Preferably, the timing unit is a timing circuit arranged inside the main control chip.
Preferably, the transformer control circuit further comprises a sampling resistor;
The first end of the sampling resistor is connected with the third end of the control tube and the sampling pin of the main control chip, and the second end of the sampling resistor is grounded.
The embodiment of the utility model also provides a charging circuit which comprises a rectifying module, a secondary rectifying and filtering module, a power output module and the transformer module;
The rectification module, the transformer, the secondary rectification filter module and the power output module are sequentially connected in series between the power input end and the power output end;
the first end of the transformer control circuit is connected with the primary winding of the transformer, and the second end of the transformer control circuit is connected with a connecting node between the rectifying module and the transformer.
Preferably, the charging circuit further comprises an optocoupler feedback control circuit;
The first end of the optical coupler feedback control circuit is connected with the transformer control circuit, and the second end of the optical coupler feedback control circuit is connected with the power output module and is used for outputting a feedback control signal to the transformer control circuit according to the output power of the power output module;
The transformer control circuit is used for adjusting the output power of the transformer according to the feedback control signal.
The embodiment of the utility model also provides a charger, which comprises a shell and the charging circuit, wherein the charging circuit is arranged in the shell.
In the transformer module, the charging circuit and the charger provided by the embodiment of the utility model, the induction circuit is added in the transformer control circuit, so that the output power can be automatically adjusted at the transformer end according to the induction information, and when the transformer module, the charging circuit and the charger are applied to the charging circuit, one side of a protocol chip of the charging circuit does not need to detect the induction information any more to form additional feedback control on the transformer control circuit, thereby being beneficial to simplifying the protocol control circuit and saving the development cost of the charger.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments of the present utility model will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of a charging circuit according to an embodiment of the utility model;
fig. 2 is a schematic circuit diagram of a charging circuit according to an embodiment of the utility model.
In the figure: 1. a transformer module; 11. a transformer; 12. a transformer control circuit; 121. an induction circuit; 122. a main control chip; 2. a rectifying module; 3. a secondary rectifying and filtering module; 4. a power output module; 5. an optocoupler feedback control circuit.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be understood that the present utility model may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the utility model to those skilled in the art. In the drawings, the dimensions and relative dimensions of layers and regions may be exaggerated for the same elements throughout for clarity.
It will be understood that when an element or layer is referred to as being "on" …, "" adjacent to "…," "connected to" or "coupled to" another element or layer, it can be directly on, adjacent to, connected to or coupled to the other element or layer, or intervening elements or layers may be present. In contrast, when an element is referred to as being "directly on" …, "" directly adjacent to "…," "directly connected to" or "directly coupled to" another element or layer, there are no intervening elements or layers present. It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present utility model.
Spatially relative terms, such as "under …," "under …," "below," "under …," "over …," "above," and the like, may be used herein for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use and operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "under" or "beneath" other elements would then be oriented "on" the other elements or features. Thus, the exemplary terms "below …" and "under …" may include both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or other orientations) and the spatially relative descriptors used herein interpreted accordingly.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term "and/or" includes any and all combinations of the associated listed items.
In the following description, for the purpose of providing a thorough understanding of the present utility model, detailed structures and steps are presented in order to illustrate the technical solution presented by the present utility model. Preferred embodiments of the present utility model are described in detail below, however, the present utility model may have other embodiments in addition to these detailed descriptions.
The embodiment of the utility model provides a transformer module 1, which comprises a transformer 11 and a transformer control circuit 12; the primary winding of the transformer 11 is used for being connected with the rectifying module 2, and the secondary winding of the transformer 11 is used for being connected with the secondary rectifying and filtering module 3; a first end of the transformer control circuit 12 is connected with a primary winding of the transformer 11, and a second end of the transformer control circuit 12 is connected with a connection node between the rectifying module 2 and the transformer 11; the transformer control circuit 12 includes an induction circuit 121, and the transformer control circuit 12 is configured to adjust the output power of the transformer 11 according to the induction information detected by the induction circuit 121.
As an example, the transformer module 1 includes a transformer 11 and a transformer control circuit 12, which can be applied in a charging circuit. The primary winding of the transformer 11 is connected with the rectifying module 2 in the charging circuit, and the secondary winding of the transformer 11 is connected with the secondary rectifying and filtering module 3 in the charging circuit, and is used for carrying out step-down processing on the voltage output by the rectifying module 2 and transmitting the voltage to the secondary rectifying and filtering module 3. The transformer 11 may be a flyback transformer 11, when the primary winding is turned on, energy is stored in the primary winding, when the primary winding is turned off, the secondary winding obtains energy due to back electromotive force, one end of the transformer control circuit 12 is connected with the primary winding of the transformer 11, and the other end is connected with a connection node between the transformer 11 and the rectifying module 2, so as to control the on or off of the primary winding of the transformer 11, and further control the output power of the transformer 11. The transformer control circuit 12 further includes an induction circuit 121, and the induction circuit 121 is configured to detect corresponding induction information, such as temperature information and charging time, and the transformer control circuit 12 adjusts the output power of the transformer 11 according to the detected induction information.
In this example, by adding the induction circuit 121 in the transformer control circuit 12, the output power can be adjusted automatically at the transformer 11 end according to the induction information, and when the power supply circuit is applied in the charging circuit, the protocol chip side in the power output module of the charging circuit can be enabled to avoid detecting the induction information again to form additional feedback control on the transformer control circuit 12, which is beneficial to simplifying the protocol control circuit and saving development cost.
In one embodiment, the transformer control circuit 12 includes a main control chip 122 and a control tube Q1; the first end of the control tube Q1 is connected with the primary of the transformer 11, the second end of the control tube Q1 is connected with the driving pin D of the main control chip 122, and the third end of the control tube Q1 is grounded; the main control chip 122 is connected to the sensing circuit 121, and is configured to adjust a duty ratio or a working frequency of the PWM signal output by the driving pin D according to the sensing information detected by the sensing circuit 121, and adjust the output power of the transformer 11.
As an example, the transformer control circuit 12 includes a main control chip 122 and a control tube Q1. The control tube Q1 can be an NMOS tube, the first end of the control tube Q1 is the drain electrode of the NMOS tube, the second end of the control tube Q1 is the grid electrode of the NMOS tube, and the third end of the control tube Q1 is the source electrode of the NMOS tube. As shown in fig. 2, the source of the NMOS tube is connected to the primary winding of the transformer 11, the gate of the NMOS tube is connected to the driving pin D of the main control chip 122, the drain of the NMOS tube is grounded, the main control chip 122 outputs a PWM signal to the NMOS tube through the driving pin D to control the on or off of the NMOS tube, when the PWM signal is a high level signal to turn on the NMOS tube, the primary winding of the transformer 11 is turned on, the energy output by the rectifying module 2 is stored in the primary winding, when the PWM signal is a low level signal to turn off the NMOS tube, the primary winding is turned off to generate a back electromotive force, and the secondary winding obtains the energy. The main control chip 122 is connected with the induction circuit 121, and adjusts the duty ratio of the PWM signal according to the induction information detected by the induction circuit 121, so as to adjust the conduction time of the primary winding of the transformer 11 and adjust the output power of the transformer 11; or the main control chip 122 adjusts the working frequency of the PWM signal, thereby adjusting the output power of the transformer 11.
In one embodiment, the sensing circuit 121 includes a temperature detecting unit, and the transformer control circuit 12 is configured to adjust the output power of the transformer 11 according to the measured temperature detected by the temperature detecting unit.
As an example, the sensing circuit 121 includes a temperature detecting unit, which is configured to detect an actual measured temperature of the charger, and the temperature detecting unit adjusts the output power of the transformer 11 according to the detected actual measured temperature, and specifically, when the actual measured temperature of the charger is greater than a preset temperature threshold, controls to reduce the duty ratio or the operating frequency of the PWM signal output by the driving pin D, and reduces the output power of the transformer 11, so as to optimize the charging process and protect the charged device.
In an embodiment, the temperature detecting unit includes a thermistor RT, a first end of the thermistor RT is connected to the over-temperature protection pin OTP of the main control chip 122, and a second end of the thermistor RT is grounded.
As an example, the temperature detecting unit includes a thermistor RT, where a first end of the thermistor RT is connected to the over-temperature protection pin OTP of the main control chip 122, and a second end of the thermistor RT is grounded. The thermistor RT can change the resistance value of the thermistor according to the temperature of the environment, so that the OTP current of the over-temperature protection pin changes correspondingly, when the measured temperature of the charger is larger than a preset temperature threshold value, the thermistor RT changes correspondingly according to the measured temperature, when the inside of the OTP of the over-temperature protection pin of the main control chip 122 is a voltage source, the resistance value of the thermistor RT changes, the current at the OTP of the over-temperature protection pin is caused to change along with the change and exceed a preset current threshold value, the main control chip 122 detects that the current at the OTP of the over-temperature protection pin is larger than the preset current threshold value, the duty ratio or the working frequency of PWM signals output by the driving pin D is controlled to be reduced, and the output power of the transformer 11 is reduced; or when the inside of the over-temperature protection pin OTP of the main control chip 122 is a current source, the resistance of the thermistor RT changes, so that the voltage at the over-temperature protection pin OTP is caused to change and exceed the preset voltage threshold, the main control chip 122 detects that the voltage at the over-temperature protection pin OTP is greater than the preset voltage threshold, and controls to reduce the duty ratio or the working frequency of the PWM signal output by the driving pin D and reduce the output power of the transformer 11.
In one embodiment, the sensing circuit 121 includes a timing unit, and the transformer control circuit 12 is configured to adjust the output power of the transformer 11 according to the charging time detected by the timing unit.
As an example, the sensing circuit 121 further includes a timing unit, the timing unit is configured to calculate a charging time of the charging circuit, and the main control chip 122 adjusts the output power of the transformer 11 according to the charging time collected by the timing unit, specifically, when the charging time is longer than a preset charging time, controls to reduce the duty ratio or the working frequency of the PWM signal output by the driving pin D, and reduces the output power of the transformer 11 to optimize the charging process and protect the charged device.
In one embodiment, the timing unit is a timing circuit disposed inside the main control chip 122.
As an example, the timing unit may be a timing circuit integrated inside the main control chip 122, where the timing circuit starts to count when the main control chip 122 is turned on, and the time obtained by counting is the charging time, and when the main control chip 122 detects that the charging time is longer than the preset charging time, the duty ratio or the working frequency of the PWM signal output by the driving pin D is controlled to be reduced, so as to reduce the output power of the transformer 11.
In one embodiment, the transformer control circuit 12 further includes a sampling resistor RCS; the first end of the sampling resistor RCS is connected to the third end of the control tube Q1 and the sampling pin CS of the main control chip 122, and the second end of the sampling resistor RCS is grounded.
As an example, the transformer control circuit 12 further includes a sampling resistor RCS, where a first end of the sampling resistor RCS is connected to the sampling pin CS of the main control chip 122 and a third end of the control tube Q1, that is, a source electrode of the NMOS tube, and a second end of the sampling resistor RCS is grounded. When the output voltage of the rectifying module 2 is abnormal, the current of the NMOS tube is increased when the NMOS tube is conducted, so that the voltage on the sampling resistor RCS exceeds the preset voltage, and the main control chip 122 detects the voltage at the sampling pin CS, namely, when the voltage on the sampling resistor RCS is larger than the preset voltage, the output of the PWM signal is controlled to be stopped, so that the NMOS tube is protected from being damaged by large current.
The embodiment of the utility model also provides a charging circuit which comprises a rectifying module 2, a secondary rectifying and filtering module 3, a power output module 4 and the transformer module 1 in any embodiment; the rectifying module 2, the transformer 11, the secondary rectifying and filtering module 3 and the power output module 4 are sequentially connected in series between the power input end and the power output end; the first end of the transformer control circuit 12 is connected to the primary of the transformer 11, and the second end of the transformer control circuit 12 is connected to the connection node between the rectifier module 2 and the transformer 11.
As an example, the charging circuit comprises a rectifying module 2, a transformer 11, a secondary rectifying and filtering module 3 and a power output module 4, which are sequentially arranged in series between a power input terminal for connecting to a mains circuit and a power output terminal for connecting to a device to be charged. The rectification module 2 is used for rectifying and filtering the mains voltage and outputting the mains voltage to the transformer module 1, the transformer module 1 is used for carrying out step-down processing on the voltage output by the rectification module 2 and converting the voltage into voltage acceptable by the charged equipment, the secondary rectification and filtering module 3 is used for carrying out further rectifying and filtering processing on the voltage output by the secondary winding of the transformer 11 and outputting the voltage to the charged equipment, and the power output module 4 comprises a protocol chip which is used for carrying out handshake with the charged equipment to determine the charging voltage. In the transformer module 1, the transformer control circuit 12 is used for controlling on or off of the primary winding of the transformer 11, and further controlling the output power of the transformer 11. The sensing circuit 121 in the transformer control circuit 12 is configured to detect corresponding sensing information, such as temperature information and charging time, and according to the detected sensing information, the transformer control circuit 12 can control to autonomously adjust the output power of the transformer 11, and the protocol chip end does not need to detect the sensing information any more to form additional feedback control on the transformer control circuit 12, which is beneficial to simplifying the protocol control circuit and saving development cost.
In an embodiment, the charging circuit further comprises an optocoupler feedback control circuit 5; the first end of the optocoupler feedback control circuit 5 is connected with the transformer control circuit 12, and the second end of the optocoupler feedback control circuit 5 is connected with the power output module 4 and is used for outputting a feedback control signal to the transformer control circuit 12 according to the current output power; the transformer control circuit 12 is used for adjusting the output power of the transformer 11 according to the feedback control signal.
As an example, the charging circuit further comprises an optocoupler feedback control circuit 5. The first end of the optocoupler feedback circuit is connected with the transformer control circuit 12, the second end of the optocoupler feedback control circuit 5 is connected with the power output module 4 and is used for detecting the current output voltage, and generating a feedback control signal according to the current output voltage and reporting the feedback control signal to the main control chip 122 of the transformer control circuit 12. Specifically, after the transformer control circuit 12 adjusts the output power of the transformer 11 according to the induction information, the optocoupler feedback control circuit 5 generates a feedback control signal according to the voltage output by the secondary side of the transformer 11, and the main control chip 122 can know the output voltage of the secondary side of the transformer 11 according to the feedback control signal, so that feedback control is continuously performed on the output PWM signal, so that the output voltage of the secondary side of the transformer 11 meets the voltage reduction control expectation.
The embodiment of the utility model also provides a charger, a package shell and the charging circuit in any of the embodiments, wherein the charging circuit is arranged in the shell.
As an example, the charger includes a housing and the charging circuit of any of the examples described above, the charging circuit being disposed within the housing. In this example, by adding the induction circuit 121 in the transformer control circuit 12, the output power of the transformer 11 can be adjusted automatically according to the induction information, and the protocol chip side of the charging circuit does not need to detect the induction information any more to form additional feedback control on the transformer control circuit 12, which is beneficial to simplifying the protocol control circuit and saving development cost.
The above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model, and are intended to be included in the scope of the present utility model.
Claims (9)
1. A transformer module, comprising a transformer and a transformer control circuit;
The primary winding of the transformer is used for being connected with the rectification module, and the secondary winding of the transformer is used for being connected with the secondary rectification filter module;
The first end of the transformer control circuit is connected with the primary winding of the transformer, and the second end of the transformer control circuit is connected with a connection node between the rectifying module and the transformer;
The transformer control circuit comprises an induction circuit, a main control chip and a control tube;
The first end of the control tube is connected with the primary winding of the transformer, the second end of the control tube is connected with the driving pin of the main control chip, and the third end of the control tube is grounded;
the main control chip is connected with the induction circuit and is used for adjusting the duty ratio or the working frequency of the PWM signal output by the driving pin according to the induction information detected by the induction circuit and adjusting the output power of the transformer.
2. The transformer module of claim 1, wherein the sensing circuit comprises a temperature detection unit and the transformer control circuit is configured to adjust the output power of the transformer based on the measured temperature detected by the temperature detection unit.
3. The transformer module of claim 2, wherein the temperature detection unit comprises a thermistor, a first end of the thermistor is connected to an over-temperature protection pin of the main control chip, and a second end of the thermistor is grounded.
4. The transformer module of claim 1, wherein the sensing circuit comprises a timing unit and the transformer control circuit is configured to adjust the output power of the transformer based on the charging time detected by the timing unit.
5. The transformer module of claim 4, wherein the timing unit is a timing circuit disposed inside the main control chip.
6. The transformer module of claim 1, wherein the transformer control circuit further comprises a sampling resistor;
The first end of the sampling resistor is connected with the third end of the control tube and the sampling pin of the main control chip, and the second end of the sampling resistor is grounded.
7. A charging circuit comprising a rectifying module, a secondary rectifying and filtering module, a power output module, and the transformer module of any one of claims 1-6;
The rectification module, the transformer, the secondary rectification filter module and the power output module are sequentially connected in series between the power input end and the power output end;
the first end of the transformer control circuit is connected with the primary winding of the transformer, and the second end of the transformer control circuit is connected with a connecting node between the rectifying module and the transformer.
8. The charging circuit of claim 7, further comprising an optocoupler feedback control circuit;
The first end of the optical coupler feedback control circuit is connected with the transformer control circuit, and the second end of the optical coupler feedback control circuit is connected with the power output module and is used for outputting a feedback control signal to the transformer control circuit according to the output power of the power output module;
The transformer control circuit is used for adjusting the output power of the transformer according to the feedback control signal.
9. A charger comprising a housing and the charging circuit of any one of claims 7-8, the charging circuit being disposed within the housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322975874.6U CN221328647U (en) | 2023-11-03 | 2023-11-03 | Transformer module, charging circuit and charger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322975874.6U CN221328647U (en) | 2023-11-03 | 2023-11-03 | Transformer module, charging circuit and charger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221328647U true CN221328647U (en) | 2024-07-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322975874.6U Active CN221328647U (en) | 2023-11-03 | 2023-11-03 | Transformer module, charging circuit and charger |
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| Country | Link |
|---|---|
| CN (1) | CN221328647U (en) |
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2023
- 2023-11-03 CN CN202322975874.6U patent/CN221328647U/en active Active
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