CN220775427U - Quick charging conversion circuit and charger - Google Patents
Quick charging conversion circuit and charger Download PDFInfo
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- CN220775427U CN220775427U CN202322307230.XU CN202322307230U CN220775427U CN 220775427 U CN220775427 U CN 220775427U CN 202322307230 U CN202322307230 U CN 202322307230U CN 220775427 U CN220775427 U CN 220775427U
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 25
- 239000003990 capacitor Substances 0.000 claims description 14
- 238000005070 sampling Methods 0.000 claims description 13
- 230000002265 prevention Effects 0.000 claims description 5
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 9
- 230000002093 peripheral effect Effects 0.000 description 6
- 230000001360 synchronised effect Effects 0.000 description 6
- 238000001514 detection method Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 1
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Abstract
The embodiment of the utility model provides a quick charge conversion circuit and a charger, wherein the quick charge conversion circuit comprises: the input end is used for being connected with the PD charging head through a charging wire; the protocol chip is used for communicating with the PD charging head; the micro-processing unit is connected with the protocol chip, the constant voltage comparison amplifier and the constant current comparison amplifier; a boosting circuit for boosting an input voltage input from an input terminal and outputting the voltage through an output terminal; the constant voltage comparison amplifier is used for comparing the output voltage of the voltage boosting circuit with the voltage signal output by the micro-processing unit to obtain a voltage error signal, and adjusting the output voltage according to the voltage error signal; and the constant current comparison amplifier is used for comparing the output current of the booster circuit with the current signal converted from the voltage signal output by the micro-processing unit to obtain a current error signal, and adjusting the output current according to the current error signal. The embodiment can realize the constancy of the converted output current and voltage and control the output power.
Description
Technical Field
The utility model relates to the field of circuits, in particular to a fast charging conversion circuit and a charger.
Background
For most electronic devices, it is necessary to charge the electronic devices to maintain the cruising of the electronic devices. Generally, most of the chargers of electronic devices on the market are dedicated, which results in that a plurality of chargers need to be carried simultaneously when a plurality of electronic devices are carried, which not only occupies space, but also is troublesome to use.
At present, some charging conversion circuits are also available, and different voltage outputs can be realized through the charging conversion circuits, so that one charger charges various electronic devices, however, the existing multifunctional charger can realize voltage conversion, but has the condition that the converted voltage and power are not stable enough, and damage can be caused to the charged electronic devices.
Disclosure of Invention
In view of the above, embodiments of the present disclosure provide a fast charging conversion circuit and a charger, which at least partially solve the problems in the prior art.
The utility model discloses a fast charge conversion circuit, which comprises: the device comprises an input end, a protocol chip, a micro-processing unit, a boost circuit, a constant voltage comparison amplifier and a constant current comparison amplifier;
the input end is used for being connected with the PD charging head through a charging wire;
the protocol chip is electrically connected with the input end and is used for communicating with the PD charging head;
the micro-processing unit is electrically connected with the protocol chip, the constant voltage comparison amplifier and the constant current comparison amplifier;
the boosting circuit is connected with the input end and is used for boosting the input voltage from the input end and outputting the voltage through the output end;
the constant voltage comparison amplifier is connected with the voltage boosting circuit and is used for comparing the output voltage of the voltage boosting circuit with the voltage signal output by the micro-processing unit to obtain a voltage error signal, and the output voltage of the voltage boosting circuit is regulated according to the voltage error signal;
and the constant current comparison amplifier is connected with the boost circuit and is used for comparing the output current of the boost circuit with a current signal converted from a voltage signal output by the micro-processing unit to obtain a current error signal, and adjusting the output current of the boost circuit according to the current error signal.
Preferably, the input terminal is a TYPE C interface.
Preferably, the voltage stabilizing circuit further comprises a backflow preventing diode connected with the VBUS pin of the input end and a voltage stabilizing IC connected with the micro processing unit.
Preferably, the micro-processing unit is in communication with the protocol chip through a pd_sda pin and a pd_scl pin, and the negative electrode of the backflow prevention diode is respectively connected with the second capacitor C2 and the third capacitor C3.
Preferably, the pwm_vfb pin of the micro-processing unit is connected to the positive input pin of the constant voltage comparison amplifier, the negative input pin of the constant voltage comparison amplifier is connected to the output end of the boost circuit, and the output end of the constant voltage comparison amplifier is connected to the feedback pin of the boost circuit.
Preferably, an integrating circuit is provided between the pwm_vfb pin of the micro processing unit and the positive input pin of the constant voltage comparison amplifier.
Preferably, the pwm_ifb pin of the micro-processing unit is connected to a positive input pin of the constant current comparison amplifier, an output end of the boost circuit is connected to a negative input pin of the constant current comparison amplifier through a current sampling resistor, and an output end of the constant current comparison amplifier is connected to a feedback pin of the boost circuit.
Preferably, the micro-processing unit further comprises a current detection amplifier, the current sampling resistor is further connected with a positive input pin of the current detection amplifier, and an output end of the current detection amplifier is connected with a current sampling pin of the micro-processing unit.
Preferably, the voltage boosting circuit further comprises a first voltage dividing resistor and a second voltage dividing resistor, wherein the output end of the voltage boosting circuit is sequentially connected with the first voltage dividing resistor and the second voltage dividing resistor, and the voltage sampling pin of the micro-processing unit is connected between the first voltage dividing resistor and the second voltage dividing resistor.
The embodiment of the utility model also provides a charger which comprises a PD charging head, a charging interface and the quick charging conversion circuit, and is characterized in that the quick charging conversion circuit is arranged between the PD charging head and the charging interface.
In summary, in this embodiment, through the constant voltage comparison amplifier and the constant current comparison amplifier, the constant voltage and the constant current output in the voltage conversion can be realized, the purposes of power control and tracking are achieved, and the damage to the electronic device caused by unstable voltage and current is avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings may be obtained according to these drawings without inventive effort to a person of ordinary skill in the art.
Fig. 1 is a circuit schematic diagram of a fast charge conversion circuit according to a first embodiment of the present utility model.
Fig. 2 is a circuit schematic diagram of the input terminal and its peripheral circuit.
Fig. 3 is a circuit schematic diagram of a protocol chip and its peripheral circuits.
Fig. 4 is a circuit schematic diagram of a microprocessor unit and its peripheral circuits.
Fig. 5 is a circuit schematic diagram of the boost circuit.
Fig. 6 is a circuit schematic diagram of a constant voltage comparison amplifier and its peripheral circuit.
Fig. 7 is a circuit schematic diagram of a constant current comparison amplifier and its peripheral circuits.
Fig. 8 is a circuit schematic diagram of a current amplifier and its peripheral circuits.
Fig. 9 is a schematic structural diagram of a charger according to a second embodiment of the present utility model.
Detailed Description
Embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
Other advantages and effects of the present disclosure will become readily apparent to those skilled in the art from the following disclosure, which describes embodiments of the present disclosure by way of specific examples. It will be apparent that the described embodiments are merely some, but not all embodiments of the present disclosure. The disclosure may be embodied or practiced in other different specific embodiments, and details within the subject specification may be modified or changed from various points of view and applications without departing from the spirit of the disclosure. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict. All other embodiments, which can be made by one of ordinary skill in the art without inventive effort, based on the embodiments in this disclosure are intended to be within the scope of this disclosure.
It is noted that various aspects of the embodiments are described below within the scope of the following claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the present disclosure, one skilled in the art will appreciate that one aspect described herein may be implemented independently of any other aspect, and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number of the aspects set forth herein. In addition, such apparatus may be implemented and/or such methods practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.
It should also be noted that the illustrations provided in the following embodiments merely illustrate the basic concepts of the disclosure by way of illustration, and only the components related to the disclosure are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.
In addition, in the following description, specific details are provided in order to provide a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects may be practiced without these specific details.
Referring to fig. 1, a fast charge conversion circuit is provided in a first embodiment of the present utility model, and the fast charge conversion circuit is used for charging a battery pack or a battery pack, wherein the charge conversion circuit may be disposed outside the battery pack or the battery pack, or may be disposed inside the battery pack or the battery pack.
The fast charge conversion circuit includes: an input terminal 10, a protocol chip 20, a microprocessor unit 30, a booster circuit 40, a constant voltage comparison amplifier 50, and a constant current comparison amplifier 60; wherein:
the input terminal 10 is used for being connected with the PD charging head through a charging wire.
Referring to fig. 2, in this embodiment, the input terminal 10 may be a USB TYPE C interface, which may be connected to a PD charging head, so as to implement rapid charging.
Among them, in particular, a backflow prevention diode D4 is further included, and the backflow prevention diode D4 can prevent backflow to the PD charging head.
And the protocol chip 20 is electrically connected with the input end 10 and is used for communicating with the PD charging head.
In this embodiment, as shown in fig. 3, the protocol chip 20 is mainly responsible for controlling the output voltage and the read rated power of the PD charging head.
Wherein, in particular, the protocol chip 20 may be of the HUSB238 type
The microprocessor unit 30 is connected to the protocol chip 20, the constant voltage comparison amplifier 50, and the constant current comparison amplifier 60.
In the present embodiment, the micro-processing unit 30 may be XUC F1376F
As shown in fig. 4, after the microprocessor unit 30 detects the battery of the electronic device to be charged through the ad_vfb, it communicates with the protocol chip 20 through the pd_sda pin (serial data pin) and the pd_scl pin (serial clock pin), and the protocol chip 20 controls the PD charging head to make the PD charging head output a specified voltage, and the output voltage flows to the anti-backflow diode D4 through the VBUS pin of the input terminal 10, and then flows to the second capacitor C2 and the third capacitor C3 for filtering.
The specified voltage is set according to the needs of the electronic device, and may be, for example, 3.6V, 5V, 10V, 20V, etc., and the present utility model is not limited thereto.
A booster circuit 40 is connected to the input terminal 10, and boosts an input voltage inputted from the input terminal 10 and outputs the voltage through an output terminal.
In this embodiment, as shown in fig. 5, the boost circuit 40 is composed of a boost synchronous rectification control chip U3, a first inductor L1, a second switching circuit Q2, a second switching circuit Q3, an eleventh capacitor C11-thirteenth capacitor C13, and provides the required voltage and current for the conversion output.
Wherein, the model of the boost synchronous rectification control chip U3 can be EG1164
And a constant voltage comparison amplifier 50 connected to the booster circuit 40 for comparing the output voltage of the booster circuit 40 with the voltage signal outputted from the microprocessor unit 30 to obtain a voltage error signal, and adjusting the output voltage of the booster circuit 40 according to the voltage error signal.
As shown in fig. 6, the PWM signal generated by the microprocessor unit 30 through the pwm_vfb pin is integrated by an integrating circuit composed of a twenty-fourth capacitor C24 and a twenty-fifth capacitor C25, and then a controllably smoothed voltage signal is obtained. The voltage signal is input to the positive input pin 3 of the constant voltage comparison amplifier 50, the negative input pin 2 of the constant voltage comparison amplifier 50 is connected with the output end of the boost circuit 40, the constant voltage comparison amplifier 50 compares the output voltage of the boost circuit 40 with the voltage signal of the micro-processing unit 30 to obtain a voltage error signal, the voltage error signal is transmitted to the feedback pin FB of the boost synchronous rectification control chip 3, and the boost synchronous rectification control chip 3 adjusts the output voltage according to the voltage error signal, thereby ensuring the stability of the output voltage.
And a constant current comparison amplifier 60 connected to the boost circuit 40 for comparing the output current of the boost circuit 40 with the current signal converted from the voltage signal output by the microprocessor unit 30 to obtain a current error signal, and adjusting the output current of the boost circuit according to the current error signal.
Specifically, as shown in fig. 7, after the PWM signal generated by the micro-processing unit 30 through the pwm_ifb pin is integrated by the integrating circuit formed by the twenty-first capacitor C21 and the twenty-second capacitor C22, a controllably smoothed voltage signal is obtained to the positive input pin 5 of the constant current comparison amplifier 60; the output current of the boost circuit 40 is converted into a voltage signal through a current sampling resistor R15, and is sent to a negative input pin 6 of the constant current comparison amplifier 60 through a twenty-fifth resistor R25, the constant current comparison amplifier 60 compares the signals of the two input pins to obtain a current error signal, the current error signal is transmitted to a feedback pin FB of the boost synchronous rectification control chip 3, and the boost synchronous rectification control chip 3 adjusts the output current according to the current error signal, so that the stability of the output voltage is ensured, and the purpose of constant current power control is achieved.
Preferably, as shown in fig. 8, the current detecting device further comprises a current detecting amplifier, one end of the current sampling resistor R15 is further connected to the positive input pin 3 of the current detecting amplifier, and the output end 1 of the current detecting amplifier 70 is connected to the current sampling pin ad_ifb of the micro-processing unit 30, so as to realize reading of a current value.
In this embodiment, in particular, the constant voltage comparison amplifier 50, the constant current comparison amplifier 60, and the current detection amplifier each employ an independent two-way operational amplifier, such as LM2904.
Preferably, as shown in fig. 6, the voltage-boosting circuit further includes a first voltage-dividing resistor R13 and a second voltage-dividing resistor R20, the output end of the voltage-boosting circuit 40 is sequentially connected to the first voltage-dividing resistor R13 and the second voltage-dividing resistor R20, the voltage sampling pin ad_vfb of the micro-processing unit 30 is connected between the first voltage-dividing resistor R13 and the second voltage-dividing resistor R20, and the voltage output by the voltage-boosting circuit 40 is connected to the voltage sampling pin ad_vfb of the micro-processing unit 30 after being divided by the first voltage-dividing resistor R13 and the second voltage-dividing resistor R20, so as to realize reading of a voltage value.
The working principle of the embodiment of the utility model is explained in detail as follows:
in this embodiment, after power is applied, the protocol chip 20 communicates with the PD charging head, the microprocessor unit 30 communicates with the protocol chip 20 to read the rated power of the PD charging head, the protocol chip 20 reads the voltage value through the current sampling pin and the voltage sampling pin, calculates the output power according to the voltage value and the current value, compares the calculated output power with the rated power of the PD charging head, makes the output power smaller than the rated power, and adjusts the current by adjusting the value of pwm_ifb, thereby achieving the tracking purpose.
In summary, the constant voltage comparison amplifier 50 and the constant current comparison amplifier 60 can realize the constant voltage and current output in the voltage conversion, and achieve the purposes of power control and tracking, and avoid the damage to the electronic device caused by unstable voltage and current.
Referring to fig. 9, the second embodiment of the present utility model further provides a charger, which includes a PD charging head 200, a charging interface 300, and the fast charging conversion circuit 100 as described above, wherein the fast charging conversion circuit 100 is disposed between the PD charging head 200 and the charging interface 300.
The foregoing is merely specific embodiments of the disclosure, but the protection scope of the disclosure is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the disclosure are intended to be covered by the protection scope of the disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.
Claims (10)
1. A fast charge conversion circuit, comprising: the device comprises an input end, a protocol chip, a micro-processing unit, a boost circuit, a constant voltage comparison amplifier and a constant current comparison amplifier;
the input end is used for being connected with the PD charging head through a charging wire;
the protocol chip is electrically connected with the input end and is used for communicating with the PD charging head;
the micro-processing unit is electrically connected with the protocol chip, the constant voltage comparison amplifier and the constant current comparison amplifier;
the boosting circuit is connected with the input end and is used for boosting the input voltage from the input end and outputting the voltage through the output end;
the constant voltage comparison amplifier is connected with the voltage boosting circuit and is used for comparing the output voltage of the voltage boosting circuit with the voltage signal output by the micro-processing unit to obtain a voltage error signal, and the output voltage of the voltage boosting circuit is regulated according to the voltage error signal;
and the constant current comparison amplifier is connected with the boost circuit and is used for comparing the output current of the boost circuit with a current signal converted from a voltage signal output by the micro-processing unit to obtain a current error signal, and adjusting the output current of the boost circuit according to the current error signal.
2. The fast charge switching circuit of claim 1, wherein the input is a TYPE C interface.
3. The fast charge switching circuit of claim 1, further comprising a backflow prevention diode connected to the VBUS pin of the input terminal and a voltage stabilizing IC connected to the microprocessor unit.
4. The fast charge switching circuit of claim 3, further comprising a second capacitor C2 and a third capacitor C3, wherein the microprocessor unit communicates with the protocol chip through a pd_sda pin and a pd_scl pin, and the negative electrode of the backflow prevention diode is connected to the second capacitor C2 and the third capacitor C3, respectively.
5. The fast charge switching circuit of claim 1, wherein a pwm_vfb pin of the micro-processing unit is connected to a positive input pin of the constant voltage comparison amplifier, a negative input pin of the constant voltage comparison amplifier is connected to an output terminal of the boost circuit, and an output terminal of the constant voltage comparison amplifier is connected to a feedback pin of the boost circuit.
6. The fast charge switching circuit according to claim 1, wherein an integrating circuit is provided between a pwm_vfb pin of the micro-processing unit and a positive input pin of a constant voltage comparison amplifier.
7. The fast charge switching circuit of claim 1, wherein a pwm_ifb pin of the micro-processing unit is connected to a positive input pin of the constant current comparison amplifier, an output terminal of the boost circuit is connected to a negative input pin of the constant current comparison amplifier through a current sampling resistor, and an output terminal of the constant current comparison amplifier is connected to a feedback pin of the boost circuit.
8. The fast charge switching circuit of claim 7, further comprising a current sense amplifier, wherein the current sense resistor is further coupled to a positive input pin of the current sense amplifier, and wherein an output of the current sense amplifier is coupled to a current sense pin of the microprocessor unit.
9. The fast charge switching circuit of claim 7, further comprising a first voltage dividing resistor and a second voltage dividing resistor, wherein an output end of the voltage boosting circuit is sequentially connected with the first voltage dividing resistor and the second voltage dividing resistor, and a voltage sampling pin of the micro-processing unit is connected between the first voltage dividing resistor and the second voltage dividing resistor.
10. A charger comprising a PD charging head, a charging interface, and a fast charge conversion circuit according to any one of claims 1 to 9, the fast charge conversion circuit being disposed between the PD charging head and the charging interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322307230.XU CN220775427U (en) | 2023-08-28 | 2023-08-28 | Quick charging conversion circuit and charger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322307230.XU CN220775427U (en) | 2023-08-28 | 2023-08-28 | Quick charging conversion circuit and charger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220775427U true CN220775427U (en) | 2024-04-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322307230.XU Active CN220775427U (en) | 2023-08-28 | 2023-08-28 | Quick charging conversion circuit and charger |
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| CN (1) | CN220775427U (en) |
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2023
- 2023-08-28 CN CN202322307230.XU patent/CN220775427U/en active Active
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