CN114503393A - Charger circuit - Google Patents

Charger circuit Download PDF

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Publication number
CN114503393A
CN114503393A CN202180005693.1A CN202180005693A CN114503393A CN 114503393 A CN114503393 A CN 114503393A CN 202180005693 A CN202180005693 A CN 202180005693A CN 114503393 A CN114503393 A CN 114503393A
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China
Prior art keywords
voltage
circuit
output
module
factor correction
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Pending
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CN202180005693.1A
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Chinese (zh)
Inventor
谢飞
胡定高
赵德琦
吴壬华
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Shenzhen Shinry Technologies Co Ltd
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Shenzhen Shinry Technologies Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H02J7/04—Regulation of charging current or voltage
    • H02J7/06—Regulation of charging current or voltage using discharge tubes or semiconductor devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/4241—Arrangements for improving power factor of AC input using a resonant converter
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses a charger circuit which comprises a power factor correction module, a resonance power conversion module and a feedback control module, wherein when the output voltage of the resonance power conversion module changes, the feedback control module is coupled with hardware for sampling the output voltage to adjust the output voltage of the power factor correction module, so that the circuit always works at a resonance point. According to the technical scheme, the PFC voltage is adjusted through hardware, so that the resonant circuit always works in a resonant point state, and the circuit efficiency is improved.

Description

Charger circuit
Technical Field
The application relates to the technical field of circuits, in particular to a charger circuit.
Background
Under the environment of energy shortage, designing an energy-saving, efficient and high-power-density charger is a challenge in power supply products. The resonant topology circuit has the advantages of high input voltage, high Power and wide-range output voltage, so that the front-stage Power Factor Correction (PFC) boost and the rear-stage resonance become the optimal scheme of most Power supply designs.
Generally, a resonant circuit has three operating modes, the switching frequency is greater than the resonant frequency, the switching frequency is equal to the resonant frequency, and the switching frequency is less than the resonant frequency. Of these three operating modes, the efficiency is highest when the switching frequency is equal to the resonant frequency. However, the output of many power supply products is not single fixed, and it is difficult to maintain the product in a state where the switching frequency is equal to the resonant frequency. The common method for solving the problem of low efficiency is to enable the product to always work at a resonance point by adjusting the PFC voltage, namely the input voltage of the resonance circuit.
Disclosure of Invention
The application discloses charger circuit adjusts PFC voltage through hardware and makes resonant circuit's operating frequency stable, improves circuit efficiency.
The object and other objects are achieved by the features in the independent claims. Further implementations are realized in the dependent claims, the description and the drawings.
In a first aspect, the present application provides a charger circuit, including a power factor correction module, a resonant power conversion module and a feedback control module, wherein: the input end of the power factor correction module is connected with the power supply voltage input, and the output end of the power factor correction module is connected with the resonance power conversion module and used for converting the power supply voltage into a first direct current voltage; the input end of the resonance power conversion module is connected with the power factor correction module, and the output end of the resonance power conversion module is connected with the feedback control module and used for converting the first direct-current voltage into the first alternating-current voltage; the input end of the feedback control module is connected with the resonance power conversion module, the output end of the feedback control module is connected with the power factor correction module and used for sampling the first alternating voltage to obtain a second alternating voltage, converting the second alternating voltage into direct current and then carrying out error compensation with the first direct voltage, outputting the second direct voltage to the power factor correction module, and adjusting the first direct voltage output by the power factor correction module.
Because the resonant circuit has a wide range of output voltage, the resonant circuit is often used as a design scheme of a charging circuit, but when the output voltage changes, the working frequency of the resonant circuit changes along with the change of the output voltage, the efficiency of the circuit working at the resonant frequency is highest, and in order to stabilize the switching frequency of the resonant circuit at the resonant frequency, the feedback circuit hardware is used for adjusting the PFC output voltage so as to control the resonant circuit to work at a resonant point all the time, and the circuit efficiency is improved.
In some possible implementations, the feedback control module includes a sampling circuit and a compensation circuit, wherein: the sampling circuit is used for converting the first alternating voltage into direct current and outputting the direct current to the compensating circuit; and the compensation circuit is used for carrying out error compensation on the direct-current voltage output by the sampling circuit and the first direct-current voltage and outputting a second direct-current voltage to the power factor correction module.
The sampling circuit acquires the output voltage of the resonant circuit, so that the feedback circuit performs feedback adjustment according to the change of the output voltage, and the output voltage can control the working frequency of the resonant circuit to return to the resonant frequency through the compensation circuit.
In some possible implementations, the sampling circuit includes a first coil, a rectifier bridge, a first capacitor, a first resistor, and a second resistor; the first coil is connected with the input end of the rectifier bridge, the first capacitor is connected with the output end of the rectifier bridge, one end of the first resistor is connected with one end of the first capacitor, one end of the second resistor is connected with the other end of the first capacitor and is grounded, and the other end of the first resistor is connected with the other end of the second resistor.
The output voltage of the resonant circuit is sampled by using coil coupling, and the alternating voltage is converted into direct voltage through a rectifier bridge.
In some possible implementations, the compensation circuit includes a first diode, a second diode, a third resistor, a fourth resistor, and a first operational amplifier; the positive pole of first diode is connected the common terminal of first resistance and second resistance, the negative pole of second diode is connected to the negative pole of first diode, the positive voltage input is connected to the positive pole of second diode, the output of power factor correction module is connected to the one end of third resistance, the other end is connected with the one end of fourth resistance, the other end ground connection of fourth resistance, the common terminal of first diode and second diode is connected to the non inverting input end of first operational amplifier, the common terminal of third resistance and fourth resistance is connected to the inverting input end, the one end of third resistance is connected to the output.
In some possible implementations, the voltage at the inverting input terminal of the first operational amplifier and the voltage at the non-inverting input terminal of the first operational amplifier are error-compensated and then output a second dc voltage to the power factor correction module, so that the voltage at the inverting input terminal is equal to the voltage at the non-inverting input terminal.
When the output voltage is increased, the working frequency is lowered, the voltage coupled to the sampling circuit is increased, the PFC output voltage is adjusted to be increased, and when the PFC output voltage is increased, the frequency is increased and is close to the resonant frequency, so that a closed dynamic adjusting loop is formed until the proportional relation is maintained to be stable.
In some possible implementations, the resonant power conversion module includes an inverter circuit and a resonant circuit, wherein: the inverter circuit is used for converting the first direct current voltage into alternating current and outputting the alternating current to the resonance circuit; and the resonance circuit is used for converting the alternating voltage output by the inverter circuit into a first alternating voltage.
In some possible implementations, the resonant circuit includes at least one inductance and at least one capacitance.
In some possible implementations, the circuit further includes a rectifying module for converting the first ac voltage to a third dc voltage output.
In a second aspect, the present application provides a charger device, including a charger circuit, where the charger circuit is the circuit described in the first aspect or any possible implementation manner of the first aspect.
In a third aspect, the present application provides an electric vehicle, including a charger circuit, where the charger circuit is the circuit described in the first aspect or any possible implementation manner of the first aspect.
The scheme that this application provided, through the output voltage who adjusts power factor correction module, also be exactly the input voltage of resonance conversion module, make the circuit be in resonance point work all the time, solve the output voltage change and arouse the problem of circuit inefficiency, improve charge efficiency.
Drawings
Fig. 1 is a circuit diagram of a conventional charger according to an embodiment of the present disclosure;
fig. 2 is a circuit structure diagram of a charger according to an embodiment of the present application;
fig. 3 is a schematic diagram of a charger circuit according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the examples of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It will be understood that, as used in this specification and the appended claims, the terms "comprises" and "comprising," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus. Furthermore, the terms "first," "second," and "third," etc. are used to distinguish between different objects and are not used to describe a particular order.
It is to be understood that the terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only, and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items. Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
Most of charger circuits adopted by current power supply products are designed as circuits of front-stage PFC boosting and rear-stage resonance, as shown in fig. 1, power supply voltage is corrected by a power factor to output PFC direct-current voltage to an inverter circuit, the PFC direct-current voltage is converted into alternating current by the inverter circuit and then is input into a resonance circuit, the resonance circuit outputs alternating-current voltage, and the alternating-current voltage is rectified by a transformer to output charging voltage. The resonant circuit has three sections of working modes, the switching frequency is greater than the resonant frequency, the switching frequency is equal to the resonant frequency, and the switching frequency is less than the resonant frequency. In the three operating modes, when the switching frequency is equal to the resonance frequency, the equivalent impedance of the resonance circuit is minimum, and the circuit efficiency is highest. However, the output voltage of the resonant circuit in many power supply products is not single fixed, and the change of the output voltage may cause the switching frequency of the resonant circuit to change, so that it is difficult to maintain the resonant circuit in a state where the switching frequency is equal to the resonant frequency, which may reduce the efficiency of the circuit.
In order to solve the technical problem, the application discloses a charger circuit, which is provided with a coupling coil for sampling the output voltage of a resonant circuit, and the voltage output by a PFC (power factor correction) is adjusted through a feedback circuit according to the change of the output voltage, so that the switching frequency is always equal to the resonant frequency.
Fig. 2 is a circuit structure diagram of a charger according to an embodiment of the present application. As shown in fig. 2, the charger circuit includes a power factor correction module 110, a resonant power conversion module 120, and a feedback control module 130, wherein an input end of the power factor correction module 110 is connected to a power voltage input, an output end of the power factor correction module is connected to the resonant power conversion module 120, and an output end of the resonant power conversion module 120 is connected to the feedback control module 130, wherein:
the power factor correction module 110 is configured to convert an input end external ac voltage into a first dc voltage;
the resonant power conversion module 120 is configured to convert the first direct-current voltage into a first alternating-current voltage.
The feedback control module 130 is configured to sample the first ac voltage to obtain a second ac voltage, rectify the second ac voltage, perform error compensation with the first dc voltage, output the second dc voltage to the power factor correction module 110, and adjust the first dc voltage output by the power factor correction module 110.
Optionally, the charger circuit further includes a rectifying module 140 connected to the output terminal of the resonant power conversion module 120. The rectifying module 140 is configured to convert the first ac voltage into a third dc voltage and output the third dc voltage, where the third dc voltage is a charging voltage output by the charger.
Wherein, the output terminal of the resonant power conversion module 120 is coupled to the feedback control module 130 and the rectification module 140 through a transformer. The output end of the resonant power conversion module 120 is connected to a primary coil coupled to the primary side of the transformer, and the feedback control module 130 and the rectification module 140 are respectively connected to a secondary coil coupled to the secondary side of the transformer.
The ac voltage of the power source is rectified and power factor corrected by the power factor correction module 110, and outputs a first dc voltage to the resonant power conversion module 120, the resonant power conversion module 120 outputs the first ac voltage, the feedback control module 130 couples the first ac voltage via the transformer to obtain a second ac voltage, the feedback control module 130 converts the second ac voltage into a second dc voltage and outputs the second dc voltage to the power factor correction module 110, and the output first dc voltage is adjusted to make the circuit always work at a resonant point. The rectifier module 140 couples the first ac voltage to obtain a third ac voltage through a transformer, and rectifies the third ac voltage into a third dc voltage for output.
The resonant power conversion module 120 includes an inverter circuit 121 and a resonant circuit 122, an input end of the inverter circuit 121 is connected to an output end of the power factor correction module 110, an output end of the inverter circuit 121 is connected to an input end of the resonant circuit 122, and an output end of the resonant circuit 122 is coupled to the feedback control module 130 through a transformer.
Optionally, the output terminal of the resonant circuit 122 is coupled to the rectifying module 140 through a transformer.
The feedback control module 130 includes a sampling circuit 132 and a compensation circuit 131, an input end of the sampling circuit 132 is coupled to an output end of the resonant power conversion module 120, an output end of the sampling circuit 132 is connected to the compensation circuit 131, and an output end of the compensation circuit 131 is connected to the power factor correction module 110.
The adjusting process of the feedback control module 130 is as follows: when the first ac voltage output by the resonant circuit 122 increases, the switching frequency of the resonant circuit 122 originally at the resonant frequency decreases, the second ac voltage coupled to the winding of the sampling circuit 132 increases, the second ac voltage is rectified by the sampling circuit 132 and then input to the compensation circuit 131, the second dc voltage is output to the power factor correction module 110 after performing error compensation with the sampling voltage of the first dc voltage, the first dc voltage output by the power factor correction module 110 is adjusted to increase, and the inverter circuit 121 converts the increased first dc voltage into the ac voltage and then controls the switching frequency of the resonant circuit 122 to increase, and then returns to the resonant frequency.
When the first ac voltage output by the resonant circuit 122 decreases, the switching frequency of the resonant circuit 122 originally at the resonant frequency increases, the second ac voltage coupled to the winding of the sampling circuit 132 decreases, the second ac voltage is rectified by the sampling circuit 132 and then input to the compensation circuit 131, the second dc voltage is output to the power factor correction module 110 after performing error compensation with the sampling voltage of the first dc voltage, the first dc voltage output by the power factor correction module 110 is adjusted to decrease, and the inverter circuit 121 converts the decreased first dc voltage into the ac voltage and then controls the switching frequency of the resonant circuit 122 to decrease, and then returns to the resonant frequency.
Embodiments of the present application will be described below with reference to the accompanying drawings. Referring to fig. 3, fig. 3 is a schematic diagram of a charger circuit according to an embodiment of the present disclosure.
The resonant power conversion module 120 includes an inverter circuit 121 and a resonant circuit 122.
The inverter circuit 121 includes a second capacitor C2, a first switching tube S1, a second switching tube S2, a third switching tube S3, and a fourth switching tube S4.
The resonant circuit 122 is a passive one-port network including at least one capacitor and at least one inductor, the ports of which may be capacitive, inductive, and resistive. When the voltage and current at the circuit port are in phase, the circuit is resistive, which is called resonance phenomenon. The essence of resonance is that energy exchange is realized by the capacitor and the inductor, reactive power complementation is realized in the whole circuit, and the reactive power is zero. In this embodiment, the resonant circuit 122 is an LLC resonant circuit, which is a resonant circuit including two inductors and a capacitor, and it should be understood that the resonant circuit 122 may also be a resonant circuit such as an LCC and a CLLC.
The resonant circuit 122 includes a resonant inductor Lr, a resonant capacitor Cr, and a second coil N1.
The drain of the first switching tube S1 is connected to the first end of the output end of the power factor correction module 110, one end of the second capacitor C2 and the drain of the third switching tube S3, the source of the first switching tube S1 is connected to the drain of the second switching tube S2, the source of the second switching tube S2 is connected to the second end of the output end of the power factor correction module 110, the other end of the second capacitor C2, the source of the fourth switching tube S4 and the ground, and the source of the third switching tube S3 is connected to the drain of the fourth switching tube S4. A first end of the resonant inductor Lr is connected to the source of the first switching tube S1 and the drain of the second switching tube S2, a second end of the resonant inductor Lr is connected to the first end of the resonant capacitor Cr, the second end of the resonant capacitor Cr is connected to the first end of the second coil N1 of the transformer T1, the second end of the second coil N1 is connected to the source of the third switching tube S3 and the drain of the fourth switching tube S4, and the second coil N1 is coupled to the primary side of the transformer T1. The feedback control module 130 includes a compensation circuit 131 and a sampling circuit 132.
The sampling circuit 132 includes a first coil N2, a rectifier bridge, a first capacitor C1, a first resistor R1, and a second resistor R2.
In one possible implementation, the rectifier bridge includes a first rectifier diode D1, a second rectifier diode D2, a third rectifier electrode tube D3, and a fourth rectifier electrode tube D4.
The compensation circuit 131 includes a first diode D5, a second diode D6, a third resistor Ra, a fourth resistor Rb, and a first operational amplifier U1.
The first coil N2 is coupled to the second coil N1 through a transformer T1, the anode of the first rectifying diode D1 is connected to the first end of the first coil N2 and the cathode of the second rectifying diode D2, the cathode of the first rectifying diode D1 is connected to the cathode of the third rectifying diode D3, the first end of the first capacitor C1 and the first end of the first resistor R1, the anode of the second rectifying diode D2 is connected to the anode of the fourth rectifying diode, the common end of the second end of the first capacitor C1 and the second end of the second resistor R2 is grounded, the second end of the first resistor R1 is connected to the first end of the second resistor R2 and the anode of the first diode D5, the cathode of the first diode D5 is connected to the cathode of the second diode D6 and the non-inverting input terminal 5 of the operational amplifier U1, the anode of the second diode D6 is connected to the input, the first end of the fourth resistor Rb is connected to the positive voltage of the inverting input terminal of the first operational amplifier Rb 6 and the positive voltage of the first operational amplifier Ra, the second end of the fourth resistor Rb is grounded, and the first end of the third resistor Ra is connected to the output end of the operational amplifier U1 and the pfc module 110.
The principle of the embodiment of the present application is explained next with reference to fig. 3.
The power factor correction module 110 converts the input ac power into a first dc voltage Vpfc，VpfcThe driving resonant power conversion module 120 outputs a first ac voltage Vo1. The rectifier module 140 obtains a third ac voltage by coupling the transformer T1 with the first ac voltage output by the resonant circuit 122, and rectifies and converts the third ac voltage into a third dc voltage VoAnd (6) outputting.
The feedback control module 130 is coupled to the second winding N1 of the transformer T1A first coil N2, a second alternating voltage V coupled with the first coil N2o2Comprises the following steps:
Figure BDA0003577821040000051
Vo2the voltage V is output via the sampling circuit 132inTo the non-inverting input 5 of the operational amplifier U1 of the compensation circuit 131, wherein,
Figure BDA0003577821040000052
the inverting input terminal 6 of the operational amplifier U1 is connected to the output terminal of the PFC module 110, and the output voltage V is sampledpfcObtain the input voltage V of the inverting input terminal 6qComprises the following steps:
Figure BDA0003577821040000053
from the above relationship, it can be seen that:
Figure BDA0003577821040000054
voltage V of non-inverting input terminal 5 of operational amplifier U1inAnd the voltage V of the inverting input terminal 6qObtaining a second DC voltage V of the output terminal 7 through error compensationoutThe reference voltage of the PFC is adjusted. So that the voltage V at the inverting input terminal 6qVoltage V approaching non-inverting input terminal 5in. The circuit satisfies the proportional relation:
Figure BDA0003577821040000061
due to the voltage V at the inverting input 6qFor sampling the output voltage V of the PFC module 110pfcVoltage V of non-inverting input terminal 5inResonant power conversion module 120 for samplingOutput voltage V ofo1I.e. the output voltage V of the PFC module 110pfcEqual to the output voltage V of the resonant power conversion module 120o1Is determined.
Switching frequency f of resonant circuit 122 operating at the resonance pointsEqual to the resonant frequency, an impedance of 0 in the circuit, and an output voltage Vo1Equal to the input voltage. When the output voltage V iso1When changing, if VpfcThe output is constant, i.e. the input voltage of the resonant circuit 122 is constant, the switching frequency f of the resonant circuit 122 is constantsWill no longer equal the resonant frequency. The output voltage V of the PFC module 110 is adjusted by the feedback control module 130pfcEqual to the output voltage V of the resonant power conversion module 120o1I.e. the input voltage and the output voltage of the resonant circuit 122 are adjusted to be equal, so that the switching frequency returns to the resonant frequency.
When the output voltage V iso1At the time of rising, the switching frequency f of the resonant circuit 122sBy reducing, through the voltage relationship of the above feedback circuit, the second DC voltage VoutAdjusting the reference voltage of the power factor correction module 110 to control the first DC voltage VpfcIncrease the switching frequency f of the resonant circuit 122sAnd (4) rising.
Through the above feedback circuit, the voltage V coupled by the winding N2 is realizedo2Adjusting the reference voltage of the PFC module 110 to change the output voltage value V of the PFCpfcThereby ensuring that the resonant circuit 122 operates at the resonant frequency.
On the contrary, when the output voltage V iso1When decreasing, VpfcInvariably, LLC switching frequency fsThe rise is no longer equal to the resonant frequency. Winding voltage V of winding N2o2Reducing and regulating PFC output voltage VpfcDecrease; when the PFC outputs the voltage VpfcReduce and let the switching frequency fsRises and returns to the resonant frequency.
The PFC voltage is adjusted through the design of the feedback loop by hardware, so that the working frequency of the resonant circuit is controlled, the circuit always works at the resonant frequency, and the circuit efficiency is improved.
The application provides a machine of charging, including the circuit of charging that provides in this application embodiment, can use in the machine of charging of mobile vehicles such as car, truck, motorcycle, bus, ship, aircraft, helicopter, lawn mower, snow clearer, recreational vehicle, amusement park vehicle, agricultural equipment, construction equipment, tram, golf cart.
The application provides an electric automobile, includes charger device and charger circuit that this application embodiment provided.
The charger circuit provided by the embodiment of the present application is introduced in detail, and a specific example is applied to explain the principle and the implementation manner of the present application, and the description of the embodiment is only used to help understanding the method and the core idea of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims (10)

1. The utility model provides a machine circuit that charges which characterized in that, includes power factor correction module, resonance power conversion module and feedback control module, wherein:
the input end of the power factor correction module is connected with the power supply voltage input, and the output end of the power factor correction module is connected with the resonance power conversion module and is used for converting the power supply voltage into a first direct current voltage;
the input end of the resonance power conversion module is connected with the power factor correction module, and the output end of the resonance power conversion module is connected with the feedback control module and is used for converting the first direct current voltage into a first alternating current voltage;
the input end of the feedback control module is connected with the resonance power conversion module, the output end of the feedback control module is connected with the power factor correction module, and the feedback control module is used for sampling the first alternating voltage to obtain a second alternating voltage, converting the second alternating voltage into direct current and then carrying out error compensation on the second alternating voltage and the first direct voltage, outputting the second direct voltage to the power factor correction module, and adjusting the first direct voltage output by the power factor correction module.
2. The circuit of claim 1, wherein the feedback control module comprises a sampling circuit and a compensation circuit, wherein:
the sampling circuit is used for converting the first alternating-current voltage into direct current and outputting the direct current to the compensation circuit;
the compensation circuit is used for carrying out error compensation on the direct-current voltage output by the sampling circuit and the first direct-current voltage and outputting the second direct-current voltage to the power factor correction module.
3. The circuit of claim 2, wherein the sampling circuit comprises a first coil, a rectifier bridge, a first capacitor, a first resistor, and a second resistor;
the first coil is connected with the input end of the rectifier bridge, the first capacitor is connected with the output end of the rectifier bridge, one end of the first resistor is connected with one end of the first capacitor, one end of the second resistor is connected with the other end of the first capacitor and is grounded, and the other end of the first resistor is connected with the other end of the second resistor.
4. The circuit of claim 3, wherein the compensation circuit comprises a first diode, a second diode, a third resistor, a fourth resistor, and a first operational amplifier;
the positive pole of first diode connect first resistance with the common terminal of second resistance, the negative pole of first diode is connected the negative pole of second diode, the positive voltage input is connected to the positive pole of second diode, the one end of third resistance is connected the output of power factor correction module, the other end of third resistance with the one end of fourth resistance is connected, the other end ground connection of fourth resistance, the noninverting input end of first operational amplifier is connected first diode with the common terminal of second diode, the inverting input end of first operational amplifier is connected the third resistance with the common terminal of fourth resistance, the output of first operational amplifier is connected the power factor correction module.
5. The circuit of claim 4, comprising:
and after error compensation is carried out on the voltage of the inverting input end and the voltage of the non-inverting input end of the first operational amplifier, a second direct current voltage is output to the power factor correction module, so that the voltage of the inverting input end of the first operational amplifier is equal to the voltage of the non-inverting input end of the first operational amplifier.
6. The circuit of claim 1, wherein the resonant power conversion module comprises an inverter circuit and a resonant circuit, wherein:
the inverter circuit is used for converting the first direct current voltage into alternating current and outputting the alternating current to the resonance circuit;
the resonance circuit is used for converting the alternating voltage output by the inverter circuit into a first alternating voltage.
7. The circuit of claim 6, wherein the resonant circuit comprises at least one inductance and at least one capacitance.
8. The circuit of claim 1, further comprising a rectification module for converting the first ac voltage to a third dc voltage output.
9. A charger device, characterized in that it comprises a charger circuit, said charger circuit being a circuit according to any of claims 1-8.
10. An electric vehicle comprising a charger circuit as claimed in any one of claims 1 to 8.
CN202180005693.1A 2021-05-24 2021-05-24 Charger circuit Pending CN114503393A (en)

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CN117134605A (en) * 2023-04-28 2023-11-28 荣耀终端有限公司 Power supply circuit, power supply control method, and power supply device

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US7375994B2 (en) * 2005-10-11 2008-05-20 Texas Instruments Incorporated Highly efficient isolated AC/DC power conversion technique
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