CN213072188U - Power converter and charger - Google Patents
Power converter and charger Download PDFInfo
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- CN213072188U CN213072188U CN202021457567.9U CN202021457567U CN213072188U CN 213072188 U CN213072188 U CN 213072188U CN 202021457567 U CN202021457567 U CN 202021457567U CN 213072188 U CN213072188 U CN 213072188U
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Abstract
The utility model provides a power converter and charger, which comprises a rectifying and filtering circuit, a DC-DC converter, an alternating current input voltage detection circuit and a communication control circuit, wherein the rectifying and filtering circuit is connected with the DC-DC converter; the alternating current input voltage detection circuit is connected with the communication control circuit; the output port of the communication control circuit is connected with the voltage feedback port of the DC-DC converter; the rectification filter circuit is used for rectifying and filtering the received alternating current input voltage; the output voltage of the DC-DC converter is less than the input voltage; the alternating current input voltage detection circuit samples the received alternating current input voltage and obtains a voltage output alternating current voltage representation signal; the communication control circuit outputs an instruction signal according to the received alternating voltage representation signal; the DC-DC converter adjusts the power output according to the command signal. The power compensation of the power converter is realized, the size of the charger is not required to be increased, the output power of the power converter can be additionally improved, and the size design and the power density of the charger are optimized.
Description
Technical Field
The utility model relates to a power conversion technology field, in particular to power converter and charger.
Background
With the rapid development of consumer electronics, the wide application of 5G communication and large-capacity batteries, how to shorten the charging time of products and further improve the user experience becomes a hot problem in the industry, and therefore, the market demand of high-power super rapid charging is increasing.
However, since the volume of the charger is generally proportional to the power, a charger that satisfies high power is inevitably large in size and does not satisfy the requirement for portability. In addition, when the ac input voltage is low, for example, 100Vac to 120Vac, the input current is large, and at this time, the working efficiency is low, and the heat generation inside the charger is large, which is not favorable for the miniaturization design of the product.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiments of the present invention provide a power converter and a charger to optimize the volume design and power density of the charger.
In order to achieve the above object, the embodiment of the present invention provides the following technical solutions:
the utility model discloses a first aspect provides a power converter, include: the device comprises a rectification filter circuit, a DC-DC converter, an alternating current input voltage detection circuit and a communication control circuit; wherein:
the rectification filter circuit is sequentially connected with the DC-DC converter;
the alternating current input voltage detection circuit is sequentially connected with the communication control circuit; the output port of the communication control circuit is connected with the voltage feedback port of the DC-DC converter;
the rectification filter circuit is used for rectifying and filtering the received alternating current input voltage and outputting larger direct current voltage;
the DC-DC converter is used for converting the larger direct current voltage into a smaller direct current voltage;
the alternating current input voltage detection circuit is used for sampling the received alternating current input voltage and outputting an alternating current voltage representation signal according to the voltage obtained by sampling;
the communication control circuit is used for outputting an instruction signal according to the received alternating voltage representation signal;
the DC-DC converter is further used for adjusting power output according to the instruction signal, so that when the alternating current input voltage is larger than a preset voltage, the output power of the power converter is larger than the preset power.
Preferably, when the ac input voltage is in a high voltage section, the ac voltage characterization signal is at a high level, and the command signal causes the power converter to output a higher power;
when the alternating-current input voltage is in a low-voltage section, the alternating-current voltage characterization signal is at a low level, and the command signal enables the power converter to output lower power.
Preferably, the minimum voltage of the high voltage section is greater than the maximum voltage of the low voltage section.
Preferably, the alternating voltage representation signal includes a plurality of values that change in real time along with the alternating input voltage, and a mapping relationship between the alternating voltage representation signal and the command signal is preset in the communication control circuit, so that the output power of the power converter changes along with the change of the alternating input voltage.
Preferably, the ac input voltage detection circuit includes: a voltage divider circuit and a voltage comparison module, wherein,
the voltage division circuit is used for sampling the alternating current input voltage;
and the voltage comparison module is used for comparing the voltage sampled by the voltage division circuit and outputting the alternating voltage representation signal.
Preferably, the ac input voltage detection circuit further includes: the isolation optocoupler is used for coupling an alternating current voltage representation signal generated by the primary side of the power converter to the secondary side of the power converter; the transmitting end of the isolation optocoupler is connected with the output end of the voltage comparison module, and the receiving end of the isolation optocoupler is connected with the input end of the communication control circuit.
Preferably, the voltage comparison module includes an NPN triode, a base of the NPN triode receives the sampling voltage sampled by the voltage divider circuit, an emitter of the NPN triode is grounded, and a collector of the NPN triode serves as an output end of the voltage comparison module.
Preferably, the communication control circuit is further configured to receive a dc output voltage acquisition signal of the power converter, and receive a dc output current acquisition signal of the power converter.
Preferably, the communication control circuit includes: 2 current signal sampling input ports for receiving an output current of the power converter, and 1 voltage sampling input port for receiving an output voltage of the power converter;
the power converter further includes: the sampling resistor is arranged at the output end of the converter and used for sampling the output current of the power converter; and two ends of the sampling resistor are respectively connected with the 2 current signal sampling input ports.
The utility model discloses the second aspect still provides a charger, including output interface and as aforesaid arbitrary power converter, communication control circuit among the power converter still be used for with output interface carries out communication control.
Based on the above, the embodiment of the present invention provides a power converter, wherein the ac input voltage detection circuit receives the ac input voltage of the power converter, and accordingly outputs the ac voltage characterization signal to the communication control circuit thereof, so that the command signal generated by the communication control circuit can adjust the power output of the DC-DC converter in the power converter; if the ac input voltage is greater than a predetermined voltage, such as greater than 180Vac, the output power of the power converter is greater than a predetermined power. Therefore, the power compensation of the power converter is realized, the size of the charger is not required to be increased, the output power of the power converter can be additionally improved, and the size design and the power density of the charger are optimized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a power converter according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an ac input voltage detection circuit in a power converter according to an embodiment of the present invention;
fig. 3 is a diagram illustrating a specific connection relationship of an ac input voltage detection circuit in a power converter according to an embodiment of the present invention;
fig. 4 is a diagram illustrating a connection relationship between a communication control circuit in a power converter and a DC-DC converter in the power converter according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In the prior art, when designing a mobile terminal charger, the working input voltage is generally set as: 100Vac-240 Vac; if the input voltage is between 100Vac and 120Vac, the input voltage is in a low input voltage stage, the input current is large, and the working efficiency is low, so that the internal heat generation of the charger is high, and the miniaturization design of the charger is not facilitated. In addition, in general, the volume of the charger is proportional to the power, and if the market demand of high-power super quick charging is met, the volume of the charger cannot be increased, so that the portable requirement cannot be met.
Therefore, the utility model provides a power converter to optimize the volume design and the power density of charger.
The schematic structural diagram of the power converter is shown in fig. 1, and includes: a rectifying filter circuit 110, a DC-DC converter 120, an ac input voltage detection circuit 130, and a communication control circuit 140; wherein:
the rectifying and filtering circuit 110 is connected with the DC-DC converter 120 in sequence; the alternating-current input voltage detection circuit 130 is sequentially connected with the communication control circuit 140; an output port of the communication control circuit 140 is connected to a voltage feedback port of the DC-DC converter 120.
The specific connection relationship is as follows:
the input terminal of the rectifying filter circuit 110 is generally connected to the input terminal (L and N shown in fig. 1) of the power converter through an EMI (Electromagnetic Interference) filter circuit to receive an ac input voltage; the output end of the rectifying and filtering circuit 110 is connected with the input end of the DC-DC converter 120; the Output terminal of the DC-DC converter 120 serves as the Output terminal (Output shown in fig. 1) of the power converter, and outputs the DC power.
The input terminal of the ac input voltage detection circuit 130 receives an ac input voltage; the output end of the ac input voltage detection circuit 130 is connected to the input end of the communication control circuit 140; the output terminal of the communication control circuit 140 outputs a command signal and is connected to the voltage feedback port of the DC-DC converter 120, i.e., the FB pin of the DC-DC converter 120.
The specific working principle is as follows:
the rectifying and filtering circuit 110 rectifies and filters the ac input voltage and outputs a larger dc voltage; the DC-DC converter 120 converts the larger DC voltage to a smaller DC voltage; that is, the DC-DC converter 120 is a Buck circuit, so that its output voltage is smaller than the input voltage, and thus it is suitable for a conventional charging situation. The ac input voltage detection circuit 130 samples the received ac input voltage, and generates and outputs an ac voltage characterization signal according to the sampled voltage, so as to characterize the magnitude of the ac input voltage received by the ac input voltage detection circuit. The communication control circuit 140 outputs a command signal to the voltage feedback port of the DC-DC converter 120 according to the received alternating voltage representation signal, so that the DC-DC converter 120 can also adjust power output according to the command signal; when the ac input voltage is greater than the preset voltage, the output power of the power converter is greater than the preset power, for example, when the ac input voltage is greater than 180Vac, the output power of the power converter is greater than the preset power, thereby realizing power compensation for the power converter; when the alternating-current input voltage is smaller than the preset voltage, the output end power of the power converter is smaller than the preset power, so that the input current is not increased, the internal heating of the charger is not high, and the miniaturization design of the charger is facilitated.
Therefore, the power converter provided in this embodiment implements power compensation for the power converter through the above-mentioned working principle of the ac input voltage detection circuit 130 and the communication control circuit 140, and can additionally increase the output power of the power converter without increasing the volume of the charger, thereby optimizing the volume design and power density of the charger.
Based on the previous embodiment, the ac voltage representation signal output by the ac input voltage detection circuit 130 may be a plurality of values that change in real time along with the ac input voltage, and correspondingly, when the communication control circuit 140 outputs the instruction signal according to the received ac voltage representation signal, the communication control circuit may specifically be implemented according to a mapping relationship preset inside itself, and the specific principle is as follows:
the communication control circuit 140 is preset with a mapping relationship between the alternating voltage representation signal and the command signal; the mapping relationship may be one-to-one, that is, an ac voltage characterization signal corresponds to a command signal, and the adjustment effect of the communication control circuit 140 on the output power of the DC-DC converter 120 through the command signal is very fine; the mapping relationship may also be many-to-one, that is, a plurality of alternating voltage representation signals correspond to an instruction signal, for example, the values of the two signals may form a step-shaped corresponding waveform, and the communication control circuit 140 has a rough adjusting effect on the output power of the DC-DC converter 120 through the instruction signal; the output power of the power converter is not particularly limited as long as it can be changed following the change of the ac input voltage.
More simply, after the ac input voltage detection circuit 130 samples the ac input voltage, the adjacent ac input voltage values may be divided into the same voltage segment, and the same ac voltage representation signal is output thereto, so that the communication control circuit 140 may simply divide the command signal into a small number of command signals. The specific principle is as follows:
it is assumed that the ac input voltage detection circuit 130 divides the ac input voltage into a high voltage segment, a low voltage segment, and a normal voltage segment, wherein the minimum voltage of the ac input voltage in the high voltage segment is greater than the maximum voltage of the ac input voltage in the low voltage segment. In the high voltage segment, the alternating voltage characterization signal received by the communication control circuit 140 is in a form, for example, a high level, and then the command signal output by the communication control circuit 140 controls the DCDC converter 120 to switch to the high power mode for operation, that is, the duty ratio of the main control chip of the DCDC converter 120 is adjusted to be greater than a first preset value, so as to control the power converter to output a higher power P1; on the premise of not increasing the volume of the charger, the power density can be additionally increased when high voltage is input, and the actual measurement can additionally increase the power by 25%. In the low voltage period, if the alternating voltage characterization signal received by the communication control circuit 140 is in another form, for example, a low level, the command signal output by the communication control circuit 140 controls the DC-DC converter 120 to switch to the low power mode, that is, the duty ratio of the main control chip of the DC-DC converter 120 is adjusted to be smaller than the second preset value, so as to control the output of the power converter with lower power P2; the problems of large input current and large heat generation inside the charger can be avoided, and the miniaturization design of the product is facilitated.
In practical application, the working input voltage commonly used in the art is 100Vac-240Vac, 180Vac-264Vac can be defined as the ac input voltage in the high voltage section, and 90Vac-170Vac can be defined as the ac input voltage in the low voltage section; in this embodiment, the ac input voltage corresponding to the first preset value is 180Vac, and the ac input voltage corresponding to the second preset value is 170Vac, but the present invention is not limited thereto, and those skilled in the art can set the ac input voltage according to actual situations. The two output powers of the DC-DC converter 120 can be set to P1-P2 ≧ 20%.
In practical applications, the correspondence between the ac input voltage and the ac voltage characterization signal, and the correspondence between the ac voltage characterization signal and the command signal may be in any form, or in other forms, as long as power compensation for the power converter and volume design and power density optimization of the charger can be achieved, which are within the protection scope of the present application and are not described herein any more.
In order to more intuitively understand the structure of the power converter provided by the above embodiments, the present embodiment describes the ac input voltage detection circuit 130 in detail, and the schematic diagram of the structure can be shown in fig. 2 and fig. 3. Fig. 2 is a schematic diagram of the ac input voltage detection circuit 130, which includes: a voltage divider circuit 210 and a voltage comparison module 220; wherein:
the input terminal of the voltage divider circuit 210 receives the ac input voltage; the output end of the voltage dividing circuit 210 is connected with the input end of the voltage comparison module 220; the output terminal of the voltage comparison module 220 serves as the output terminal of the ac input voltage detection circuit 130, and outputs the ac voltage characterization signal.
The voltage divider 210 is used for sampling an ac input voltage; and the voltage comparison module 220 is configured to compare voltages sampled by the voltage division circuit 210, and generate and output the alternating voltage characterization signal.
Specifically, the topology of the ac input voltage detection circuit 130 can be as shown in fig. 3, and the voltage division circuit 210 includes: a plurality of resistors (R1, R2, R3 as shown in fig. 3) and a capacitor C1; the specific connection relationship is as follows: one end of the plurality of resistors connected in series serves as an input end of the voltage dividing circuit 210; the other ends of the plurality of resistors connected in series in the voltage dividing circuit 210 and one end of the capacitor C1 are both grounded; the connection point of any two resistors in the voltage dividing circuit 210 is connected with the other end of the capacitor C1, and the connection point is used as the output end of the voltage dividing circuit 210 and is connected with the input end of the voltage comparison module 220; the output end of the voltage comparison module 220 is used as the output end of the ac input voltage detection circuit 130; in practical applications, the input terminal of the voltage divider circuit 120 may further include a diode D1, an anode of the diode D1 is connected to the input terminal of the ac input voltage detection circuit 130, and a cathode of the diode D1 is connected to the input terminal of the voltage divider circuit 210.
The number of the resistors in the voltage divider circuit 210 can be set by a technician according to actual conditions, and is within the protection scope of the present invention. In this embodiment, the voltage divider circuit 210 is illustrated by having three resistors R1-R3, and a schematic structural diagram thereof is shown in fig. 3, where the resistors R1-R3 are sequentially connected in series, at this time, one end of the resistor R1 is connected to a cathode of the diode D1 in the voltage divider circuit 210, the other end of the voltage R3 is grounded, and a connection point of the voltage divider resistors R1 and R2, or a connection point of R2 and R3, may be connected to the other end of the capacitor C1 in the voltage divider circuit 210, and fig. 3 shows that the connection point of the voltage divider resistors R2 and R3 is connected to the other end of the capacitor C1 in the voltage divider circuit 210. In addition, the structure of the voltage dividing circuit 210 is formed by selecting other numbers of voltage dividing resistors, and so on, and thus the description is omitted.
The voltage comparing module 220 may specifically include: an NPN transistor Q1. The base of the NPN transistor Q1 serves as the input terminal of the voltage comparison module 220, receives the voltage sampled by the voltage divider circuit 210, and has its emitter grounded and its collector serving as the output terminal of the voltage comparison module 220.
In addition, in order to realize the isolation between the power line and the signal line and ensure that the voltage of the signal received by the communication control circuit 140 is within the safe operating range, the ac input voltage detection circuit 130 may further be provided with an isolation optocoupler U1 for coupling an ac voltage representation signal generated by the primary side of the power converter to the secondary side of the power converter; the transmitting end of the isolation optocoupler U1 is connected with the output end of the voltage comparison module 220, and the receiving end thereof is connected with the input end of the communication control circuit 140. In a specific application, as shown in fig. 3, the ac input voltage detection circuit 130 further includes: pull-up resistor R4 and pull-down resistor R5. The specific connection relationship is as follows: a collector electrode of the NPN triode Q1 is connected with the cathode of an emission end of the isolation optocoupler U1; the positive electrode of the transmitting end of the isolation optocoupler U1 is connected with a first power supply VCC1 through a pull-up resistor R4; the anode of the receiving end of the isolation optocoupler U1 is connected to a second power supply VCC 2; the negative electrode of the receiving end of the isolation optocoupler U1 is grounded through a pull-down resistor R5; a connection point of the isolation optocoupler U1 and the pull-down resistor R5 serves as an output terminal of the ac input voltage detection circuit 130.
It should be noted that the NPN Transistor Q1 in the voltage comparison module 220 may be replaced by a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor), an IGBT (Insulated Gate Bipolar Transistor), and the like, and those skilled in the art can flexibly change the Transistor according to actual application conditions, and all of them are within the protection scope of the present embodiment.
The process of the ac input voltage detection circuit 130 shown in fig. 3 outputting the ac voltage characterization signal according to the sampled voltage specifically includes: when the alternating-current input voltage is in a high-voltage section, the voltage at two ends of the resistor R3 is greater than the turn-on voltage of the NPN triode Q1, the NPN triode Q1 is conducted, at the moment, the current of the light emitting diode U1A in the isolation optocoupler U1 passes through, the phototriode U1B is conducted, the current of the second power supply VCC2 passes through the phototriode U1B and flows through the pull-down resistor R5, and then the alternating-current voltage representation signal output by the alternating-current input voltage detection circuit 130 is in a high level; similarly, if the ac input voltage is in the low voltage range, the voltage at the two ends of the resistor R3 is smaller than the turn-on voltage of the NPN transistor Q1, at this time, the NPN transistor Q1 cannot be turned on, no current passes through the light emitting diode U1A in the isolation optocoupler U1, and the phototransistor U1B is in the turn-on state, so that the ac voltage characterization signal output by the ac input voltage detection circuit 130 is at a low level.
It should be noted that, in practical application, the ac input voltage detection circuit 130 can implement voltage sampling and can generate a corresponding characterization signal; the specific circuit implementation forms may be various, and fig. 3 is only a specific example and is not the only one, for example, the voltage comparison module 220 may also be implemented by using a comparator, which is not described herein again.
The rest of the principle is the same as the above embodiments, and is not described in detail here.
On the basis of the above embodiments, any circuit capable of generating a corresponding output signal after mapping an input signal can implement the communication control circuit 140; in practical application, a conversion circuit with a proper mapping relation can be directly selected, a circuit capable of realizing various even random mapping conversion can be selected, and a proper mapping relation is selected for application before operation; it is not specifically limited herein and is within the scope of the present application.
It should be noted that, in practical applications, the communication control circuit 140 may also be implemented by an original protocol chip inside the power converter, and the original function of the protocol chip is to implement communication with a CPU on a terminal side (for example, a mobile phone) after performing protocol conversion through an output interface in the power converter; in addition, the protocol chip comprises pins corresponding to the functions of 2 current signal sampling input ports IS +, IS-and 1 voltage sampling input port V +, and the specific pin names are not limited; meanwhile, the power converter further comprises: a sampling resistor RS 1; the connection relationship diagram of the pins of the protocol chip can be seen in fig. 4. The protocol chip voltage sampling input port V + is connected to the anode of the output end of the DC-DC converter 120, the sampling resistor RS1 is arranged at the cathode of the output end of the DC-DC converter 120, and the sampling resistor RS1 is used for sampling the output current of the power converter; and, two ends of the sampling resistor RS1 are respectively connected with the current signal sampling input ports IS + and IS-of the protocol chip. In addition, the sampling resistor RS1 may also be disposed at the positive terminal of the output end of the DC-DC converter 120, which is within the protection scope of the present invention. The protocol chip carries out operation processing by detecting a direct current output voltage acquisition signal and a direct current output current acquisition signal of the power converter to obtain the output power of the power converter; and can output a command signal to the FB pin of the DC-DC converter 120 through a pin, such as the RFBO pin, for communicating with the DC-DC converter 120, so as to control the output voltage and the output current of the DC-DC converter 120 and adjust the output power of the power converter.
In this embodiment, the Sensed pin is used as the input terminal of the communication control circuit 140, and the RFBO pin is used as the output terminal of the communication control circuit 140. With reference to fig. 4, at this time, the voltage sampling input port of the communication control circuit 140 (i.e. V + of the protocol chip in fig. 4, other names may be used for pin naming in practical application) receives the dc output voltage acquisition signal of the power converter, and 2 current signal sampling input ports of the communication control circuit 140 (i.e. IS-, IS + of the protocol chip in fig. 4, other names may be used for pin naming in practical application) are used for receiving the dc output current acquisition signal of the power converter, so that the communication control circuit 140 can monitor the dc input voltage acquisition signal, the dc output current acquisition signal, and the output power acquisition signal of the power converter in real time, and further obtain the output power thereof. When the input end (i.e., Sensed in fig. 4, which may be named by another name in practical application) detects that the ac voltage characterization signal is at a high level (or a low level), the command signal output by the output end (i.e., RFBO in fig. 4, which may be named by another name in practical application) will make the duty cycle of the DC-DC converter 120 greater than the first preset value (or less than the second preset value), so as to control the DC-DC converter 120 to switch to the high power (or low power) mode, and further control the power converter to output a higher/low power.
Specifically, the working conditions of the protocol chip are as follows: when the AC voltage is in a high voltage segment, the alternating voltage characterization signal is at a high level, that is, sense is 1, and it is known that the output power of the power converter is the lower power P2, a command signal is output through the RFBO pin, so that the output power of the DC-DC converter 120 is increased to the higher power P1; when the AC voltage is in the low voltage segment, the AC voltage characterization signal is at a low level, i.e., sense is 0, and it is known that the output power of the power converter is the higher power P1, a command signal is output through the RFBO pin, so that the output power of the DC-DC converter 120 is reduced to the lower power P2.
The rest of the principle is the same as the above embodiments, and is not described in detail here.
The utility model discloses another embodiment still provides a charger, and this charger has included output interface and the power converter that any above-mentioned embodiment provided, and communication control circuit 140 is responsible for communicating with DC-DC converter to and, after carrying out protocol conversion through output interface, realize communicating with the CPU of terminal side (for example cell-phone).
The structure and specific working principle of the power converter are the same as those of the above embodiments, and are not described in detail here.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A power converter, comprising: the device comprises a rectification filter circuit, a DC-DC converter, an alternating current input voltage detection circuit and a communication control circuit; wherein:
the rectification filter circuit is sequentially connected with the DC-DC converter;
the alternating current input voltage detection circuit is sequentially connected with the communication control circuit; the output port of the communication control circuit is connected with the voltage feedback port of the DC-DC converter;
the rectification filter circuit is used for rectifying and filtering the received alternating current input voltage;
the output voltage of the DC-DC converter is smaller than the input voltage;
the alternating current input voltage detection circuit is used for sampling the received alternating current input voltage and outputting an alternating current voltage representation signal according to the voltage obtained by sampling;
the communication control circuit is used for outputting an instruction signal according to the received alternating voltage representation signal;
the DC-DC converter is further used for adjusting power output according to the instruction signal, so that when the alternating current input voltage is larger than a preset voltage, the output power of the power converter is larger than the preset power.
2. The power converter of claim 1, wherein when the ac input voltage is in a high voltage segment, the ac voltage characterization signal is at a high level, and the command signal causes the power converter to output a higher power;
when the alternating-current input voltage is in a low-voltage section, the alternating-current voltage characterization signal is at a low level, and the command signal enables the power converter to output lower power; wherein the higher power is greater than the lower power.
3. The power converter of claim 2, wherein the minimum voltage of the high voltage segment is greater than the maximum voltage of the low voltage segment.
4. The power converter according to claim 1, wherein the ac voltage characterization signal includes a plurality of values that change in real time with the ac input voltage, and a mapping relationship between the ac voltage characterization signal and the command signal is preset in the communication control circuit, so that the output power of the power converter changes with the change of the ac input voltage.
5. The power converter of claim 1, wherein the ac input voltage detection circuit comprises: a voltage divider circuit and a voltage comparison module, wherein,
the voltage division circuit is used for sampling the alternating current input voltage;
and the voltage comparison module is used for comparing the voltage sampled by the voltage division circuit and outputting the alternating voltage representation signal.
6. The power converter of claim 5, wherein the ac input voltage detection circuit further comprises: the isolation optocoupler is used for coupling an alternating current voltage representation signal generated by the primary side of the power converter to the secondary side of the power converter; the transmitting end of the isolation optocoupler is connected with the output end of the voltage comparison module, and the receiving end of the isolation optocoupler is connected with the input end of the communication control circuit.
7. The power converter according to claim 5, wherein the voltage comparison module comprises an NPN transistor, a base of the NPN transistor receives the voltage sampled by the voltage divider circuit, an emitter of the NPN transistor is grounded, and a collector of the NPN transistor serves as an output terminal of the voltage comparison module.
8. The power converter according to any one of claims 1-7, wherein the communication control circuit is further configured to receive a dc output voltage acquisition signal of the power converter and receive a dc output current acquisition signal of the power converter.
9. The power converter of claim 8, wherein the communication control circuit comprises: 2 current signal sampling input ports for receiving an output current of the power converter, and 1 voltage sampling input port for receiving an output voltage of the power converter;
the power converter further includes: the sampling resistor is arranged at the output end of the converter and used for sampling the output current of the power converter; and two ends of the sampling resistor are respectively connected with the 2 current signal sampling input ports.
10. A charger comprising an output interface and a power converter as claimed in any one of claims 1 to 9, wherein the communication control circuit of the power converter is further configured to perform communication control with the output interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021457567.9U CN213072188U (en) | 2020-07-22 | 2020-07-22 | Power converter and charger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021457567.9U CN213072188U (en) | 2020-07-22 | 2020-07-22 | Power converter and charger |
Publications (1)
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| CN213072188U true CN213072188U (en) | 2021-04-27 |
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| CN202021457567.9U Active CN213072188U (en) | 2020-07-22 | 2020-07-22 | Power converter and charger |
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