CN111786443A - Charging device and charging system - Google Patents
Charging device and charging systemDownload PDFInfo
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- CN111786443A CN111786443ACN202010785119.XACN202010785119ACN111786443ACN 111786443 ACN111786443 ACN 111786443ACN 202010785119 ACN202010785119 ACN 202010785119ACN 111786443 ACN111786443 ACN 111786443A
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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
- H02J7/007—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
- H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
- 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
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
- 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
- H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
- H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Dc-Dc Converters (AREA)
Abstract
Description
Technical Field
The present invention relates to the field of dc charging technologies, and in particular, to a charging device and a charging system.
Background
At present, the high-voltage capacitor charging power supply has wide application prospect, and the unipolar high-voltage capacitor charging power supply is developed quickly. A conventional high-voltage capacitor charging power supply includes: a high-voltage direct-current power supply with a charging resistor and a resonant charging power supply. The high-voltage direct-current power supply with the charging resistor has the advantages of simple structure, high reliability and low cost, but has the defect of low efficiency; the resonant charging power supply has the advantages of simple structure, high reliability and the like, but has the defect of high cost caused by a large-capacity resonant capacitor, and the application range of the resonant charging power supply is limited.
Disclosure of Invention
The embodiment of the invention aims to provide a charging device, and provides a high-precision charging device with a unipolar high-voltage capacitor, and the high-symmetry output of two charging devices is realized through interconnection of voltage-sharing units, so that the requirements of users are met.
In order to solve the above technical problem, a second aspect of an embodiment of the present invention provides a charging device, including: the system comprises a full-bridge inversion module, a transformer module, a rectification module, a voltage sampling module, a current sampling module, a weak electric control module and a charging control module;
the full-bridge inversion module, the transformer module and the rectification module are sequentially connected, the input end of the full-bridge inversion module is connected with the input end of the charging device, the output end of the rectification module is connected with the output end of the charging device, and one end of the output end of the charging device is grounded;
the voltage sampling module is connected with the output end of the rectifying module in parallel;
the current sampling module is connected with the grounding end of the rectifying module in series;
the weak electric control module is connected with the voltage sampling module and the current sampling module, acquires a current sampling signal and a voltage sampling signal and transmits the current sampling signal and the voltage sampling signal to the charging control module;
the charging control module is connected with the full-bridge inversion module, and the driving frequency of the full-bridge inversion module is adjusted according to the current sampling signal, so that the constant-current charging of the charging device is realized.
Further, the charging device further includes: a DC input module;
the direct current input module is connected with the input end of the full-bridge inversion module in parallel.
Further, the charging device further includes: a smoothing module;
the smoothing module is connected with the output end of the rectifying module in parallel.
Further, the charging device further includes: a bleeding module;
the bleeder module is connected with the output end of the rectification module in parallel;
the weak electric control module is connected with the discharge module, acquires a discharge signal of the charging control module, and controls the discharge module to discharge the electric energy stored by the load according to the discharge signal.
Further, the charging device further includes: a current limiting resistor;
the current limiting resistor is connected in series with one end of the rectifier module opposite to the grounding end.
Further, the charging device further includes: a resonance module;
the full-bridge inversion module is connected with the transformer module through the resonance module.
Further, the weak current control module includes: the device comprises a current signal processing unit, a voltage signal processing unit and a discharge control unit;
the current signal processing unit is connected with the voltage sampling module, acquires the current sampling signal of the voltage sampling module and processes the current sampling signal into a current sampling signal required by the charging control module;
the voltage signal processing unit is connected with the voltage sampling module, acquires a voltage signal at a preset position of the voltage sampling module, processes the voltage signal to obtain an optical signal containing the voltage sampling signal, and transmits the optical signal to the charging control module;
the bleeding control unit is connected with the bleeding module and controls the bleeding module to bleed off the electric energy stored by the load.
Further, the charging control module includes: the power supply comprises a first control unit, a second control unit, a current PI control unit, a voltage hysteresis and multi-module voltage-sharing unit;
the first control unit is connected with the full-bridge inverter module and used for adjusting the driving frequency of the full-bridge inverter circuit;
the second controller is used for voltage setting, current setting and leakage control;
the current PI control unit acquires the current sampling signal transmitted by the current signal processing unit and controls the driving frequency of the full-bridge inversion module through the first control unit according to the current sampling signal;
the voltage hysteresis and the multi-module voltage-sharing unit carry out amplitude limiting on the output voltage of the charging device through hysteresis control given by voltage.
Further, the voltage-sharing circuit is provided with a voltage-sharing port.
Correspondingly, a second aspect of the embodiments of the present invention further provides a charging system, including any one of the two charging devices, where the two charging devices are connected in parallel, and input ends of the two charging devices are respectively connected to input ends of the charging system, an output end of one of the charging devices is connected to a positive electrode of an output end of the charging system, and an output end of the other of the charging devices is connected to a negative electrode of the output end of the charging system;
the voltage-sharing ports of the charging control modules in the two charging devices are connected through voltage-sharing signal lines, and the charging current of each charging device is calibrated.
The technical scheme of the embodiment of the invention has the following beneficial technical effects:
the constant current output of the charging device is realized and the output precision is improved by performing voltage sampling and current sampling on the output end of the charging device and adjusting the current of the output current according to the voltage sampling signal and the current sampling signal; meanwhile, the high symmetry of the positive and negative high-voltage amplitude of the charging system is realized through the voltage-sharing circuit, and the requirements of users are met.
Drawings
Fig. 1 is a schematic circuit diagram of a charging device according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a voltage equalizing unit according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a charging device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Fig. 1 is a schematic circuit diagram of a charging device according to an embodiment of the present invention.
Referring to fig. 1, an embodiment of the invention provides a charging device, including: the device comprises a full-bridge inversion module, a transformer module, a rectification module, a voltage sampling module, a current sampling module, a weak electric control module and a charging control module. The full-bridge inversion module, the transformer module and the rectification module are connected in sequence.
The input end of the full-bridge inversion module is connected with the input end of the charging device, and the full-bridge inversion module inverts the direct-current input electric energy into high-frequency alternating-current electric energy. Specifically, SW1, SW2, SW3 and SW4 are all-control power switch devices, and form a full-bridge inverter module, wherein VG1, VG2, VG3 and VG4 are all-control power switch device driving signals.
The transformer module converts the high-frequency alternating current electric energy converted by the full-bridge inversion module into electrically isolated high-voltage high-frequency alternating current electric energy.
The rectifier module selects a high-voltage high-frequency silicon stack registered by corresponding voltage and current or carries out series-parallel connection by a plurality of quick recovery diodes registered by low voltage to form a proper high-frequency high-voltage rectifier circuit, and high-voltage high-frequency alternating current electric energy is converted into high-voltage direct current electric energy. The output end of the rectifying module is connected with the output end of the charging device, and one end of the output end of the charging device is grounded. D1, D2, D3 and D4 are high-voltage high-frequency rectifier stacks or high-voltage high-frequency rectifier circuits formed by connecting a plurality of low-voltage fast recovery diodes in series and in parallel, and convert high-frequency alternating current electric energy on the secondary side of the transformer module into high-voltage direct current electric energy.
The voltage sampling module is connected with the output end of the rectifying module in parallel. R1 and R2 constitute a voltage sampling module, wherein the high-voltage arm resistor R1 can be composed of a plurality of high-voltage non-inductive resistors connected in series, and the low-voltage arm resistor R2 can be matched in resistance according to a sampling transformation ratio. The voltage sampling module forms a sampling circuit through a high-resistance high-voltage non-inductive resistor, so that the load charging current sampling signal is electrically isolated from the high-voltage output, and interference signals are prevented from being transmitted to the control loop through conduction crosstalk when the high-voltage output end discharges quickly.
The current sampling module is connected with the grounding end of the rectifying module in series. TA is a current transformer used for detecting the charging current of the charging power supply to the load and simultaneously realizing the electrical isolation of the control signal and the high-voltage output side.
The weak electric control module is connected with the voltage sampling module and the current sampling module, acquires a current sampling signal and a voltage sampling signal and transmits the current sampling signal and the voltage sampling signal to the charging control module. The charging control module is connected with the full-bridge inversion module, and the driving frequency of the full-bridge inversion module is adjusted according to the current sampling signal, so that the constant-current charging of the charging device is realized.
The technical proposal can charge the high-voltage capacitor, not only can be used as a positive high-voltage capacitor charging power supply alone, but also can be used as a negative high-voltage charging power supply alone, and can also combine two charging devices to be used as the positive and negative high-voltage capacitor charging power supply,
optionally, the charging device further includes: and a direct current input module. The direct current input module is connected with the input end of the full-bridge inversion module in parallel. The direct current input module can provide high-quality direct current electric energy for the full-bridge inverter module.
Optionally, the charging device further includes: and a smoothing module. The smoothing module is connected with the output end of the rectifying module in parallel. The smoothing module smoothes the electric energy output by the rectifying module by using the high-voltage capacitor to obtain high-voltage direct-current electric energy with small Wen wave noise. C2 is a smoothing capacitor for reducing the fluctuation of DC power rectified by HF rectifier circuit.
Optionally, the charging device further includes: a bleed-off module. R3 and QF constitute a high-voltage discharge module, when QF receives a discharge signal DISC, the contact is closed, and the residual stored energy of the high-voltage capacitor in the loop is discharged through a discharge resistor R3. The bleeder module is connected with the output end of the rectifier module in parallel. The weak electric control module is connected with the discharge module, acquires a discharge signal of the charging control module, and controls the discharge module to discharge the electric energy stored by the load according to the discharge signal. When the charging device is used or breaks down, the charging device is used for releasing the residual electric energy on the high-voltage capacitor, and the safety of personnel is ensured.
Optionally, the charging device further includes: a current limiting resistor. The current limiting resistor is connected in series with one end of the rectifying module opposite to the grounding end. The current-limiting resistor can play a role in charging and current limiting of the load, and on the other hand, plays a role in isolating and protecting the charging device when the rear-stage load has a short-circuit fault. R4 is a current-limiting resistor, can realize the charging current of the load-side high-voltage capacitor, can also realize the electrical isolation between the load-side high-voltage capacitor and the charging power supply during the rapid discharge, and plays a role in protecting the charging power supply.
Optionally, the charging device further includes: and a resonance module. The full-bridge inversion module is connected with the transformer module through the resonance module. The resonance module is added between the full-bridge inversion module and the transformer module, so that the full-bridge inversion module has short circuit resistance. L and C1 are series resonance inductance and series resonance capacitance in the inverter circuit, and the inverter circuit works in LC series resonance state, so that the inverter circuit has the capability of resisting load short circuit.
Specifically, the weak current control module includes: the device comprises a current signal processing unit, a voltage signal processing unit and a discharge control unit. The current signal processing unit is connected with the voltage sampling module, acquires a current sampling signal of the voltage sampling module and processes the current sampling signal into a current sampling signal required by the charging control module. The voltage signal processing unit is connected with the voltage sampling module, acquires a voltage signal at a preset position of the voltage sampling module, processes the voltage signal, obtains an optical signal containing the voltage sampling signal, and transmits the optical signal to the charging control module. The discharge control unit is connected with the discharge module and controls the discharge module to discharge the electric energy stored by the load.
Specifically, the charging control module includes: the device comprises a first control unit, a second control unit, a current PI control unit and a voltage hysteresis and multi-module voltage-sharing unit. The first control unit is connected with the full-bridge inverter module and used for adjusting the driving frequency of the full-bridge inverter circuit. The second controller is used for voltage setting, current setting and bleeding control. The current PI control unit acquires a current sampling signal transmitted by the current signal processing unit and controls the driving frequency of the full-bridge inversion module through the first control unit according to the current sampling signal. The voltage hysteresis and the multi-module voltage-sharing unit carry out amplitude limiting on the output voltage of the charging device through hysteresis control given by voltage.
Optionally, the first control unit is a PWM control chip, and may include a UC3867 resonance control chip and a peripheral circuit thereof, so as to implement frequency conversion fixed-width PWM control on the full-bridge inverter module of the charging power supply. The second control unit can be a PLC or DSP numerical controller, realizes control functions of current setting, voltage setting, leakage enabling and the like, realizes a communication function with an upper computer, and can realize current setting, voltage setting, leakage and basic protection functions of a control loop.
FIG. 2 is a schematic circuit diagram of a voltage equalizing unit according to an embodiment of the present invention
Further, referring to fig. 2, the voltage hysteresis and the multi-module voltage-sharing unit are provided with a voltage-sharing circuit. The voltage-sharing circuit is provided with a voltage-sharing port. The voltage equalizing circuit connects the processed positive high-voltage output voltage sampling signal and the processed negative high-voltage output voltage sampling signal together through 4 high-precision voltage equalizing resistors, when the feedback sampling voltages of the two charging devices are inconsistent, signals between the voltage equalizing resistors in each device and respective voltage sampling signals are subjected to proportional operational amplification, the obtained numerical values are superposed to the given position of the charging current, and the requirement of high symmetry of the positive and negative high-voltage output is met by finely adjusting the given value of the current.
As shown in fig. 2, the upper circuit of the voltage-sharing connection line is a voltage-sharing circuit of a first charging device, and the lower circuit is a voltage-sharing circuit of a second charging device; the charging device comprises a VF2 and a VF1 which are output voltage sampling signals processed by the respective charging devices, R1, R2, R3 and R4 are equalizing resistors with equal resistance values, according to a circuit superposition principle, when voltages at two ends of C1 and C2 are equal, VF2 and VF1 are equal, when the VF2 and the VF1 have deviation, the voltages at two ends of C1 and C2 are also unequal, after the respective deviation is amplified in proportion through U2A and U1A, IG2 and IG1 are respectively superposed on charging current setting positions of the respective charging power supply modules, and the positive and negative high-voltage power supply modules are highly symmetrical in the output voltage climbing process by adjusting the respective current setting positions.
Fig. 3 is a schematic circuit diagram of a charging device according to an embodiment of the present invention.
Referring to fig. 3, a second aspect of the present invention further provides a charging system, including two charging devices in the above embodiments, where the two charging devices are connected in parallel, and input terminals of the two charging devices are respectively connected to input terminals of the charging system, an output terminal of one charging device is connected to a positive electrode of an output terminal of the charging system, and an output terminal of the other charging device is connected to a negative electrode of the output terminal of the charging system; the voltage-sharing ports of the charging control modules in the two charging devices are connected through voltage-sharing signal lines, and the charging current of each charging device is calibrated.
In the voltage climbing and output processes of the positive high-voltage charging device and the negative high-voltage charging device, if strict amplitude symmetry needs to be kept, voltage-sharing ports of the two charging devices are connected through voltage-sharing signal lines, so that the output amplitudes of the two charging devices are highly symmetrical.
An embodiment of the present invention is directed to a charging device, including: the system comprises a full-bridge inversion module, a transformer module, a rectification module, a voltage sampling module, a current sampling module, a weak electric control module and a charging control module; the full-bridge inversion module, the transformer module and the rectification module are sequentially connected, the input end of the full-bridge inversion module is connected with the input end of the charging device, the output end of the rectification module is connected with the output end of the charging device, and one end of the output end of the charging device is grounded; the voltage sampling module is connected with the output end of the rectifying module in parallel; the current sampling module is connected with the grounding end of the rectifying module in series; the weak electric control module is connected with the voltage sampling module and the current sampling module, acquires a current sampling signal and a voltage sampling signal and transmits the current sampling signal and the voltage sampling signal to the charging control module; the charging control module is connected with the full-bridge inversion module, and the driving frequency of the full-bridge inversion module is adjusted according to the current sampling signal and the voltage sampling signal, so that the constant-current charging of the charging device is realized. The technical scheme has the following effects:
the constant current output of the charging device is realized and the output precision is improved by performing voltage sampling and current sampling on the output end of the charging device and adjusting the current of the output current according to the voltage sampling signal and the current sampling signal; meanwhile, the high symmetry of the positive and negative high-voltage amplitude of the charging system is realized through the voltage-sharing circuit, and the requirements of users are met.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (10)
1. A charging device, comprising: the system comprises a full-bridge inversion module, a transformer module, a rectification module, a voltage sampling module, a current sampling module, a weak electric control module and a charging control module;
the full-bridge inversion module, the transformer module and the rectification module are sequentially connected, the input end of the full-bridge inversion module is connected with the input end of the charging device, the output end of the rectification module is connected with the output end of the charging device, and one end of the output end of the charging device is grounded;
the voltage sampling module is connected with the output end of the rectifying module in parallel;
the current sampling module is connected with the grounding end of the rectifying module in series;
the weak electric control module is connected with the voltage sampling module and the current sampling module, acquires a current sampling signal and a voltage sampling signal and transmits the current sampling signal and the voltage sampling signal to the charging control module;
the charging control module is connected with the full-bridge inversion module, and the driving frequency of the full-bridge inversion module is adjusted according to the current sampling signal and the voltage sampling signal, so that the constant-current charging of the charging device is realized.
2. The charging device according to claim 1, further comprising: a DC input module;
the direct current input module is connected with the input end of the full-bridge inversion module in parallel.
3. The charging device according to claim 1, further comprising: a smoothing module;
the smoothing module is connected with the output end of the rectifying module in parallel.
4. The charging device according to claim 1, further comprising: a bleeding module;
the bleeder module is connected with the output end of the rectification module in parallel;
the weak electric control module is connected with the discharge module, acquires a discharge signal of the charging control module, and controls the discharge module to discharge the electric energy stored by the load according to the discharge signal.
5. The charging device according to claim 1, further comprising: a current limiting resistor;
the current limiting resistor is connected in series with one end of the rectifier module opposite to the grounding end.
6. The charging device according to claim 1, further comprising: a resonance module;
the full-bridge inversion module is connected with the transformer module through the resonance module.
7. A charging arrangement as claimed in claim 4, in which the weak electrical control module comprises: the device comprises a current signal processing unit, a voltage signal processing unit and a discharge control unit;
the current signal processing unit is connected with the voltage sampling module, acquires the current sampling signal of the voltage sampling module and processes the current sampling signal into a current sampling signal required by the charging control module;
the voltage signal processing unit is connected with the voltage sampling module, acquires a voltage signal at a preset position of the voltage sampling module, processes the voltage signal to obtain an optical signal containing the voltage sampling signal, and transmits the optical signal to the charging control module;
the discharge control unit is connected with the discharge module and controls the discharge module to discharge the electric energy stored by the load.
8. The charging device of claim 1, wherein the charging control module comprises: the power supply comprises a first control unit, a second control unit, a current PI control unit, a voltage hysteresis and multi-module voltage-sharing unit;
the first control unit is connected with the full-bridge inverter module and used for adjusting the driving frequency of the full-bridge inverter circuit;
the second controller is used for voltage setting, current setting and leakage control;
the current PI control unit acquires the current sampling signal transmitted by the current signal processing unit and controls the driving frequency of the full-bridge inversion module through the first control unit according to the current sampling signal;
the voltage hysteresis and the multi-module voltage-sharing unit carry out amplitude limiting on the output voltage of the charging device through hysteresis control given by voltage.
9. A charging arrangement as claimed in claim 8,
the voltage hysteresis and multi-module voltage-sharing unit comprises a voltage-sharing circuit;
the voltage-sharing circuit is provided with a voltage-sharing port.
10. A charging system comprising two charging devices according to claim 9, wherein the two charging devices are connected in parallel and have their input terminals connected to the input terminals of the charging system, respectively, the output terminal of one of the charging devices is connected to the positive terminal of the output terminal of the charging system, and the output terminal of the other charging device is connected to the negative terminal of the output terminal of the charging system;
the voltage-sharing ports of the charging control modules in the two charging devices are connected through voltage-sharing signal lines, and the charging current of each charging device is calibrated.
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| CN202010785119.XACN111786443A (en) | 2020-08-06 | 2020-08-06 | Charging device and charging system |
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| CN202010785119.XACN111786443A (en) | 2020-08-06 | 2020-08-06 | Charging device and charging system |
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| CN114679064A (en)* | 2022-04-12 | 2022-06-28 | 中国工程物理研究院流体物理研究所 | Integrated charging power supply |
| CN116488446A (en)* | 2023-06-21 | 2023-07-25 | 深圳市联明电源有限公司 | Laser pumping source discharging circuit, switching power supply and laser |
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| CN114679064A (en)* | 2022-04-12 | 2022-06-28 | 中国工程物理研究院流体物理研究所 | Integrated charging power supply |
| CN116488446A (en)* | 2023-06-21 | 2023-07-25 | 深圳市联明电源有限公司 | Laser pumping source discharging circuit, switching power supply and laser |
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