CN108270348B - Direct-current output low-frequency ripple suppression circuit of digital charger and control method thereof - Google Patents
Direct-current output low-frequency ripple suppression circuit of digital charger and control method thereof Download PDFInfo
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- CN108270348B CN108270348B CN201810167060.0A CN201810167060A CN108270348B CN 108270348 B CN108270348 B CN 108270348B CN 201810167060 A CN201810167060 A CN 201810167060A CN 108270348 B CN108270348 B CN 108270348B
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- 238000004891 communication Methods 0.000 claims abstract description 25
- 238000005070 sampling Methods 0.000 claims description 15
- 239000003990 capacitor Substances 0.000 claims description 8
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Classifications
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- 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
- H02M1/14—Arrangements for reducing ripples from dc input or output
- H02M1/143—Arrangements for reducing ripples from dc input or output using compensating arrangements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
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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
-
- 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
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
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- 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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0012—Control circuits using digital or numerical techniques
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a direct-current output low-frequency ripple suppression circuit of a digital charger and a control method thereof, wherein the direct-current output low-frequency ripple suppression circuit comprises an alternating-current power supply, a main power circuit, a control circuit, a rechargeable battery and a bus communication circuit; the alternating current power supply is used for providing power for the main power circuit, the main power circuit converts the alternating current power supply into a direct current power supply through rectification, and the direct current power supply charges the rechargeable battery; the control circuit is used for controlling the main power circuit; the control circuit communicates with an external control unit through a bus communication circuit. The control method comprises the following steps: 1. starting; 2. initializing a power-on self-checking and capturing unit; 3. judging whether a pulse width modulation signal capturing interrupt occurs or not; 4. judging whether the capturing of the pulse width modulation signal is normal or not; 5. calculating the frequency and the phase of the input alternating voltage; 6. calculating a compensation factor according to the load factor; 7. obtaining ripple compensation quantity according to the phase, frequency and compensation factor table lookup; 8. the compensation amount is superimposed on the actual output control amount.
Description
Technical Field
The invention relates to a digital charger technology, in particular to a direct-current output low-frequency ripple suppression circuit of a digital charger and a control method thereof.
Background
The current power level of the vehicle-mounted charger is generally 3.3kW or 6.6kW, and the main current circuit topology of the current power level adopts a switching power supply circuit topology (such as a front-stage PFC and a rear-stage LLC). Due to the restriction of the Power Factor (PFC) requirement, low-frequency ripple waves with 2 times of power frequency (100 Hz/120 Hz) are necessarily existed on the DC bus side of the output of the front-stage PFC circuit. This low frequency ripple, if left untreated, will be reflected in the final direct current output by the subsequent DC-DC conversion. As an output of the vehicle-mounted charger, if the low-frequency ripple is large, large current or voltage fluctuation is generated. First, this will have an effect on the operation of the BMS, and serious charging may not be possible. Secondly, charging the battery with a direct current of a larger low frequency ripple component can reduce the service life of the battery.
For this reason, it is necessary to suppress the low-frequency ripple of the battery charger output. To inhibit low-frequency ripple at the output end of the charger, two approaches are available: the low-frequency ripple on the front-stage PFC output bus side is reduced, or the ripple is controlled at the rear stage, so that the component of the direct current output at the rear stage is restrained. The conventional method corresponding to the former is to directly connect a large-capacity electrolytic capacitor, a storage battery or an active filter device in parallel on a PFC output DC bus. Thus, although the low-frequency ripple current is effectively restrained, the high-capacity electrolytic capacitor and the active filter device not only can increase the system cost and the product volume, but also can influence the service life of the product by using a large amount of electrolytic capacitors. The latter mode is usually adopted in practice, namely, closed-loop control is performed on the low-frequency ripple in a later-stage circuit control algorithm, and the effect of suppressing the low-frequency ripple is achieved by reducing the control bandwidth. Although this method can also work, the dynamic response of the latter stage DC-DC converter is poor, and when the load is suddenly changed, it needs at least several power frequency cycles to be stable, which is a high risk point for the reliability of the product.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a device which can compensate the calculated control quantity on the output control quantity in normal closed-loop control so as to achieve the purpose of inhibiting output low-frequency ripple, thereby saving cost and volume, and improving product performance and service life.
Another object of the present invention is to provide a control method of the dc output low-frequency ripple suppression circuit of the digital charger.
In order to achieve the first object of the present invention, the following technical solutions may be adopted:
a DC output low-frequency ripple suppression circuit of a digital charger comprises an AC power supply, a main power circuit, a control circuit, a rechargeable battery and a bus communication circuit; the alternating current power supply is used for providing power for the main power circuit, the main power circuit is used for converting the alternating current power supply into a direct current power supply through rectification, and the converted direct current power supply charges the rechargeable battery; the output specification of the direct current power supply is controlled by a control circuit; the control circuit is used for controlling the main power circuit; the control circuit communicates with an external control unit through a bus communication circuit.
The control circuit is used for controlling the main power circuit and comprises analog quantity sampling, driving circuit control and temperature detection control.
The main power circuit comprises an input relay circuit, wherein the input relay circuit is used for protecting the main power circuit by switching on and switching off an alternating current power supply input by the main power circuit; the uncontrolled rectifying circuit is used for converting an alternating current power supply input by the relay circuit into a direct current power supply through rectification; the boost circuit boosts the converted direct current power supply to a fixed direct current voltage, so that the direct current voltage is controlled in amplitude; the filter circuit is used for filtering the boosted direct-current power supply; the resonant circuit is used for converting the filtered direct current into an output controllable direct current power supply, and the resonant circuit charges a rechargeable battery through an output relay; and the output relay is used for switching off or switching on the charger and the rechargeable battery.
The control circuit comprises a sampling circuit, a phase-locking circuit and a control circuit, wherein the sampling circuit is used for sampling the voltage and the current of the output circuit, and the phase-locking circuit is used for detecting the frequency and the phase of the alternating voltage of the input circuit; the alternating current side singlechip is used for converting the analog signal input by the sampling circuit into a digital signal; the direct-current single chip microcomputer is used for obtaining the phase and the frequency of an alternating-current power supply from a pulse width modulation signal input by the phase-locked circuit, so as to obtain the frequency and the phase of 2 times of power frequency ripple on an output direct-current voltage, and the direct-current single chip microcomputer combines the pulse width modulation signal with a coefficient obtained by looking up the output load characteristic table, so as to obtain the compensation quantity for suppressing the output ripple; the driving circuit is used for converting a power control signal sent by the direct-current side singlechip into a level signal with voltage and current suitable for switching on or switching off a power tube signal; the serial communication circuit is used for communication between the alternating current side singlechip and the direct current side singlechip; and the bus communication circuit is connected with the direct-current side singlechip through a bus communication interface and is used for communication transmission of an external controller.
The phase-locked circuit comprises a zero-crossing comparison circuit and a pulse width modulation signal capturing circuit; the zero-crossing comparison circuit is used for converting the analog signal into a digital signal; the pulse width modulation signal capturing circuit is used for timing calculation of the period and the duty ratio of the pulse width modulation signal to obtain a digital signal; the alternating current power supply is converted into a direct current electric signal through the uncontrolled rectifying circuit and is input to the zero-crossing comparison circuit, and the direct current signal input to the zero-crossing comparison circuit is input to the direct current side singlechip through the pulse width modulation signal capturing circuit.
The filter circuit is a direct current bus capacitor which is used for storing circuit energy and filtering voltage signals.
A control method of a direct current output low-frequency ripple suppression circuit of a digital charger comprises the following steps:
1) Starting;
2) Initializing a power-on self-checking and capturing unit; if so, entering the next step; if not, superposing the compensation factor on the actual output control quantity;
3) Judging whether a pulse width modulation signal capturing interrupt occurs or not; if the capturing interruption of the pulse width modulation signal occurs, entering the next step; if no pulse width modulation signal capturing interruption occurs, superimposing a compensation factor on the actual output control quantity;
4) Judging whether the capturing of the pulse width modulation signal is normal or not; if so, entering the next step; if not, superposing the compensation factor on the actual output control quantity;
5) Calculating the frequency and the phase of the input alternating voltage;
6) Calculating a compensation factor according to the load factor;
7) Obtaining ripple compensation quantity according to the phase, frequency and compensation factor table lookup;
8) The compensation amount is superimposed on the actual output control amount.
The beneficial effects of the invention are as follows: 1) The invention can effectively inhibit the low-frequency ripple of the output voltage in the current-limiting state; 2) The invention is beneficial to miniaturization of an electric vehicle-mounted charger (OBC) because the invention does not need to increase a large direct-current side filter capacitor or sacrifice a loop control bandwidth of a rear-stage converter, 3) the product cost is reduced, and the performance and the reliability of the whole electric vehicle system are improved.
Drawings
FIG. 1 is a block diagram of a battery charger system according to an embodiment of the present invention;
FIG. 2 is a block diagram of a charge lock circuit according to an embodiment of the present invention;
fig. 3 is a flowchart of a control method of an on-vehicle charging device of an electric vehicle according to an embodiment of the invention.
Detailed Description
The invention will be described in further detail with reference to the accompanying drawings.
As a vehicle-mounted product, the high reliability and the high performance of the charger must be considered, but the mature technical scheme at present cannot be considered well. Therefore, the invention provides a new control mode, which can effectively inhibit the output low-frequency ripple without increasing hardware cost and volume or sacrificing the control response bandwidth of a later-stage loop. The control mode is to obtain sine quantity with 2 times of power frequency and the same phase by phase locking the input alternating voltage in the subsequent stage DC-DC. And simultaneously, according to the output voltage, the output current and the ripple amplitude value, fitting the three-dimensional matrix table, and obtaining a compensation factor. And multiplying the compensation factor by the sine quantity corresponding to the input voltage to obtain a compensation quantity with the same phase as the output current ripple. And finally subtracting the compensation quantity from the normal closed-loop control output quantity, thereby achieving the effect of suppressing the output current ripple by an open loop.
Referring to fig. 1, the dc output low-frequency ripple suppression circuit of the digital charger includes an ac power supply 1, a main power circuit 3, a control circuit 4, a rechargeable battery 5 and a bus communication circuit 6; the alternating current power supply 1 is used for providing power for the main power circuit 3, the main power circuit 3 is used for converting the alternating current power supply into the direct current power supply 2 through rectification, and the converted direct current power supply 2 charges the rechargeable battery 5; the output specification of the direct current power supply 2 is controlled by a control circuit 4; the control circuit 4 is used for controlling the main power circuit 3; the control circuit 4 communicates with an external control unit via a bus communication circuit 6.
The control circuit 4 is used for controlling the main power circuit 3, and comprises analog quantity sampling, driving circuit control and temperature detection control.
The main power circuit 3 comprises an input relay circuit 31, wherein the input relay circuit 31 is used for switching on and switching off an alternating current power supply 1 input by the main power circuit 3 to protect the main power circuit 3; the on-off of the alternating current at the input side of the charger is realized, and if the condition of abnormal input voltage occurs, the relay is disconnected to perform self-protection on the charger;
an uncontrolled rectifying circuit 32, the uncontrolled rectifying circuit 32 is used for converting the alternating current power supply 1 input by the relay circuit 31 into a direct current power supply through rectification; making the amplitude of the direct current be the same as the peak value of the alternating current input voltage; a PFC boost circuit 33, the PFC boost circuit 33 boosting the converted dc voltage to a fixed dc voltage, the dc voltage being controlled in magnitude; the PFC boost circuit 33 boosts the dc power after the change of the uncontrolled rectifier bridge to a fixed dc voltage, the voltage being amplitude controlled. However, because of the higher power factor, the BUS voltage after boosting has ripple voltage of twice the power frequency;
a filter circuit 414 for filtering the boosted DC power supply by the filter circuit 34; the filter circuit can be a direct current bus capacitor, and the direct current bus capacitor is used for storing circuit energy and filtering voltage signals. The device is used for storing energy and filtering, and under the same condition, the larger the capacitance is, the smaller the ripple amplitude on the bus voltage is.
A resonant circuit 35, said resonant circuit 35 being arranged to convert the filtered direct current into an output controllable direct current, the resonant circuit 35 charging the rechargeable battery 5 via an output relay circuit 36. The circuit is used to change a fixed BUS voltage into a direct current with adjustable output voltage and current to charge the battery. The circuit is characterized in that the power switch can realize soft switching, and the conversion efficiency is higher; the output relay 36 is used to switch the charger off or on the rechargeable battery 5. When charging is not needed or the charger detects abnormal output, the relay is opened, and if the charging condition is met, the relay is closed;
referring to fig. 1, the control circuit 4 includes a sampling circuit 45, the sampling circuit 45 is configured to sample a voltage and a current of the output circuit, the sampling circuit 45 samples a voltage and a current of the output side of the charger and a voltage output by the PFC boost circuit 33, and converts an analog quantity into a level range that can be received by the single-chip microcomputer. The singlechip converts the analog signal into a digital signal through AD conversion, and then processes the acquired data.
A phase-lock circuit 46, wherein the phase-lock circuit 46 is used for detecting the frequency and the phase of the alternating voltage of the input circuit; the frequency and phase of the ac input voltage are detected, and a Pulse Width Modulation (PWM) signal with the same frequency and phase is generated and sent to the dc-side singlechip 43. The ac side single-chip microcomputer 43 is configured to obtain a phase and a frequency of an ac power supply from a pulse width modulation signal (PWM) input from the phase-locked circuit 46, so as to obtain a frequency and a phase of 2 times of power frequency ripple on an output dc voltage, where the dc side single-chip microcomputer 43 combines the pulse width modulation signal (PWM) with a coefficient obtained by looking up a table corresponding to an output load characteristic, so as to obtain a compensation amount for suppressing the output ripple;
referring to fig. 2, the phase lock circuit 46 includes a zero crossing comparison circuit and a pulse width modulated signal acquisition circuit; the zero-crossing comparison circuit is used for converting the analog signal into a digital signal; the pulse width modulation signal capturing circuit is used for timing calculation of the period and the duty ratio of the pulse width modulation signal to obtain a digital signal; the alternating current power supply is converted into a direct current electric signal through the uncontrolled rectifying circuit and is input to the zero-crossing comparison circuit, and the direct current signal input to the zero-crossing comparison circuit is input to the direct current side singlechip through the pulse width modulation signal capturing circuit.
Referring to fig. 1, an ac side single chip 41, the ac side single chip 41 is used for converting an analog signal input by a sampling circuit 45 into a digital signal; the driving circuit 47 is used for converting a power control signal sent by the direct-current side singlechip 4 into a level signal with voltage and current suitable for switching on or switching off the power signal; the driving circuit 47 changes a power tube (MOSFET) control signal sent out by the singlechip into a level signal with voltage and current suitable for driving the power tube to be turned on or turned off through the driving circuit 47;
a serial communication circuit (SCI) 42, where the serial communication circuit (SCI) 42 is used for communication between the ac side singlechip 41 and the dc side singlechip 43; and a bus (CAN) communication circuit 6, wherein the bus (CAN) communication circuit 6 is connected with the direct-current side singlechip 43 through a CAN communication interface 44 for communication transmission to an external controller.
Referring to fig. 3, the control method of the vehicle-mounted charging device of the electric automobile in the embodiment of the invention mainly comprises the following steps:
step 1) starting S1;
step 2), initializing an electric self-checking and capturing unit S2; if so, entering the next step; if not, superimposing the compensation factor on the actual output control amount S8;
step 3), judging whether a pulse width modulation signal capturing interrupt occurs or not S3; if the capturing interruption of the pulse width modulation signal occurs, entering the next step; if no pulse width modulation signal capture interruption occurs, superimposing a compensation factor on the actual output control amount S8;
step 4), judging whether the capturing of the pulse width modulation signal is normal or not S4; if so, entering the next step; if not, superimposing the compensation factor on the actual output control amount S8;
step 5), calculating the frequency and the phase S5 of the input alternating voltage;
step 6), calculating a compensation factor S6 according to the load factor;
step 7), obtaining ripple compensation quantity S7 according to the phase, frequency and compensation factor table lookup;
step 8), superposing the compensation quantity on the actual output control quantity S8;
the foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention.
Claims (5)
1. The direct current output low-frequency ripple suppression circuit of the digital charger is characterized in that: the device comprises an alternating current power supply, a main power circuit, a control circuit, a rechargeable battery and a bus communication circuit; the alternating current power supply is used for providing power for the main power circuit, the main power circuit is used for converting the alternating current power supply into a direct current power supply through rectification, and the converted direct current power supply charges the rechargeable battery; the output specification of the direct current power supply is controlled by a control circuit; the control circuit is used for controlling the main power circuit; the control circuit communicates with an external control unit through a bus communication circuit; the main power circuit comprises an input relay circuit, wherein the input relay circuit is used for switching on and switching off an alternating current power supply input by the main power circuit to protect the main power circuit; the uncontrolled rectifying circuit is used for converting an alternating current power supply input by the relay circuit into a direct current power supply through rectification; the boost circuit boosts the converted direct current power supply to a fixed direct current voltage, so that the direct current voltage is controlled in amplitude; the filter circuit is used for filtering the boosted direct-current power supply; the resonant circuit is used for converting the filtered direct current into an output controllable direct current power supply, and the resonant circuit charges the rechargeable battery through the output relay; the output relay is used for switching off or switching on the charger and the rechargeable battery; the control circuit comprises a sampling circuit, a phase-locking circuit and a control circuit, wherein the sampling circuit is used for sampling the voltage and the current of the output circuit, and the phase-locking circuit is used for detecting the frequency and the phase of the alternating voltage of the input circuit; the alternating current side singlechip is used for converting the analog signal input by the sampling circuit into a digital signal; the direct-current single chip microcomputer is used for obtaining the phase and the frequency of an alternating-current power supply from a pulse width modulation signal input by the phase-locked circuit, so as to obtain the frequency and the phase of 2 times of power frequency ripple on an output direct-current voltage, and the direct-current single chip microcomputer combines the pulse width modulation signal with a coefficient obtained by correspondingly looking up an output load characteristic table, so as to obtain the compensation quantity for suppressing the output ripple; the driving circuit is used for converting a power control signal sent by the direct-current side singlechip into a level signal with voltage and current suitable for switching on or switching off a power tube signal; the serial communication circuit is used for communication between the alternating current side singlechip and the direct current side singlechip; and the bus communication circuit is connected with the direct-current side singlechip through a bus communication interface and is used for communication transmission of an external controller.
2. The dc output low frequency ripple suppression circuit of a digital charger of claim 1, wherein: the control circuit is used for controlling the main power circuit and comprises analog quantity sampling, driving circuit control and temperature detection control.
3. The dc output low frequency ripple suppression circuit of a digital charger of claim 1, wherein: the phase-locked circuit comprises a zero-crossing comparison circuit and a pulse width modulation signal capturing circuit; the zero-crossing comparison circuit is used for converting the analog signal into a digital signal; the pulse width modulation signal capturing circuit is used for timing calculation of the period and the duty ratio of the pulse width modulation signal to obtain a digital signal; the alternating current power supply is converted into a direct current electric signal through the uncontrolled rectifying circuit and is input to the zero-crossing comparison circuit, and the direct current signal input to the zero-crossing comparison circuit is input to the direct current side singlechip through the pulse width modulation signal capturing circuit.
4. The dc output low frequency ripple suppression circuit of a digital charger of claim 1, wherein: the filter circuit is a direct current bus capacitor which is used for storing circuit energy and filtering voltage signals.
5. A control method of a dc output low-frequency ripple suppression circuit of a digital charger, applied to the dc output low-frequency ripple suppression circuit of the digital charger as claimed in any one of claims 1 to 4, characterized in that: the method comprises the following steps:
1) Starting;
2) Initializing a power-on self-checking and capturing unit;
3) Judging whether a pulse width modulation signal capturing interrupt occurs or not; if yes, executing step 4); otherwise, executing the step 3) again;
4) Judging whether the capturing of the pulse width modulation signal is normal or not; if so, executing the step 5); otherwise, executing the step 3) again;
5) Calculating the frequency and the phase of the input alternating voltage;
6) Calculating a compensation factor according to the load factor;
7) Obtaining ripple compensation quantity according to the phase, frequency and compensation factor table lookup;
8) The compensation amount is superimposed on the actual output control amount.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810167060.0A CN108270348B (en) | 2018-02-28 | 2018-02-28 | Direct-current output low-frequency ripple suppression circuit of digital charger and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810167060.0A CN108270348B (en) | 2018-02-28 | 2018-02-28 | Direct-current output low-frequency ripple suppression circuit of digital charger and control method thereof |
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| CN108270348A CN108270348A (en) | 2018-07-10 |
| CN108270348B true CN108270348B (en) | 2024-03-08 |
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|---|---|---|---|---|
| CN109600028A (en) * | 2019-01-07 | 2019-04-09 | 江苏固德威电源科技股份有限公司 | A kind of inverter direct-flow side inductance ripple compensation method |
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