CN116317536A - High-voltage non-overshoot direct-current power supply - Google Patents
High-voltage non-overshoot direct-current power supply Download PDFInfo
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- CN116317536A CN116317536A CN202310564736.0A CN202310564736A CN116317536A CN 116317536 A CN116317536 A CN 116317536A CN 202310564736 A CN202310564736 A CN 202310564736A CN 116317536 A CN116317536 A CN 116317536A
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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
- H02M3/00—Conversion of dc power input into dc power output
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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
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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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
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
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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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in 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
- 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
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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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention belongs to the field of electric variable adjustment, and relates to a high-voltage non-overshoot direct-current power supply, wherein a resistor R1 is connected in series with a capacitor C1 at the output side of a high-voltage full-bridge rectifying circuit, a fixed duty ratio circuit is electrically connected with a DC-AC circuit, a peak current control circuit is electrically connected with an isolation driving circuit, an AND gate logic circuit and a BUCK circuit, the isolation driving circuit is electrically connected with the BUCK circuit, the AND gate logic circuit is electrically connected with a current loop PI control circuit and a voltage loop PID control circuit, the current loop PI control circuit is electrically connected with a current isolation sampling circuit, a resistor R1 is connected in parallel with the output side of the current isolation sampling circuit, a voltage loop PID control circuit is electrically connected with an integral capacitor discharging circuit and a voltage isolation sampling circuit, a capacitor C1 is connected in parallel with the output side of the voltage isolation sampling circuit, and a singlechip is electrically connected with the current loop PI control circuit and the voltage loop PID control circuit. The direct-current high-voltage output by the invention has no overshoot, small ripple and strong load capacity.
Description
Technical Field
The invention belongs to the technical field of electric variable adjustment, and particularly relates to a high-voltage non-overshoot direct-current power supply.
Background
Along with the popularization of new energy sources, the application of lithium ion batteries is becoming wider and wider. Structurally, the lithium ion battery needs to be kept in an insulating state between the positive electrode and the negative electrode and between each electrode and the casing. In the lithium ion battery production process, if metal foreign matter is mixed in or the separator is damaged or broken, insulation resistance (between the electrodes and the case) is lowered, and if the insulating state cannot be maintained, there is a risk that the battery life is reduced or a fire accident occurs.
In order to meet the requirements of the electric automobile industry, the lithium ion battery carried by the electric automobile is required to meet the requirements of high energy density, high-current charging, long service life, safety, no ignition and other performances, and in order to achieve the characteristics, the lithium ion battery is required to be subjected to performance detection in each process of the battery manufacturing process, and a high-voltage direct current power supply is required to be used in the performance detection process of the lithium ion battery. At present, the conventional direct-current high-voltage implementation mode is that sinusoidal alternating-current voltage output through single-phase inversion passes through a power frequency step-up transformer and then outputs direct-current high-voltage through half-wave rectification.
The existing mode of generating direct current high voltage is that a power frequency (50 Hz/60 Hz) or low frequency (300 Hz/600 Hz) sine voltage signal outputs direct current voltage through half-wave rectification, and the direct current voltage output in the mode can be overlapped with an alternating current pulse signal with the same frequency, so that the ripple wave of the direct current voltage output in the mode is large. When the load is heavier, the mode of generating direct current high voltage is generated by power frequency or low frequency signals through half-wave rectification, the consumed current on the half-wave rectified filter capacitor is larger than the complementary current, the output voltage can generate great load effect, the output voltage can be caused to fluctuate, and the peak value of the output voltage is increased. Therefore, when the capacitive load of the lithium ion battery is tested in the mode, the problems of inaccurate measurement result, poor repeatability and the like are easy to occur.
Disclosure of Invention
In order to solve the technical problems, the invention provides a high-voltage non-overshoot direct-current power supply which can be used for insulation resistance test and micro short circuit test of a lithium ion battery before liquid injection. The technical scheme adopted by the invention is as follows:
the high-voltage non-overshoot direct-current power supply comprises a switching power supply, a BUCK circuit, a DC-AC circuit, a high-frequency step-up transformer and a high-voltage full-bridge rectifying circuit which are electrically connected in sequence, wherein the output side of the high-voltage full-bridge rectifying circuit is connected with a resistor R1 in series and then connected with a capacitor C1 in parallel, a fixed duty ratio circuit is electrically connected with the DC-AC circuit, a peak current control circuit is respectively and electrically connected with an isolation driving circuit, an AND gate logic circuit and the BUCK circuit, the isolation driving circuit is electrically connected with the BUCK circuit, the AND gate logic circuit is respectively and electrically connected with a current loop PI control circuit and a voltage loop PID control circuit, the current loop PI control circuit is electrically connected with a current isolation sampling circuit, the output side of the current isolation sampling circuit is connected with a resistor R1 in parallel, the voltage loop PID control circuit is respectively and electrically connected with an integral capacitor discharging circuit and a voltage isolation sampling circuit, and the output side of the voltage isolation sampling circuit is connected with a capacitor C1 in parallel, and a singlechip is respectively and electrically connected with the current loop PI control circuit and the voltage loop PID control circuit;
the integrating capacitor discharging circuit comprises operational amplifiers U1, U2 and U3, the operational amplifiers U2 and U3 form a high input impedance differential sampling circuit, the voltage of an integrating capacitor C65 is collected to the same-direction input end of the operational amplifier U1, a steady-state value Kx+b expected by the integrating capacitor C65 is input to the reverse input end of the operational amplifier, and the output end of the U1 is electrically connected with the singlechip and the voltage loop PID control circuit respectively through a control switch K.
Preferably, the structure of the integrating capacitor discharging circuit is as follows: the resistor R3 is electrically connected with the reverse input end of the U1, the resistor R2 is respectively electrically connected with the reverse input end and the output end of the U1, the resistor R4 and the resistor R5 are respectively electrically connected with the same-direction input end of the U1, and the output end of the U3 is electrically connected with the R4; the two ends of the integrating capacitor C65 are respectively and electrically connected with the resistor R8 and the resistor R11, the resistor R8 is electrically connected with the homodromous input end of the U2, the resistor R7 is electrically connected with the reverse input end of the U2, the resistor R6 is respectively and electrically connected with the reverse input end and the output end of the U2, the output end of the U2 is electrically connected with the resistor R10, the R10 is electrically connected with the reverse input end of the U3, and the resistor R9 is respectively and electrically connected with the reverse input end and the output end of the U3.
Preferably, the DC-AC circuit is a half-bridge DC-AC circuit or a full-bridge DC-AC circuit.
Preferably, the singlechip adopts an STM32F407 singlechip, and the peak current control circuit adopts a current mode PWM control chip UC3843.
The invention has the following advantages:
the output direct-current high-voltage has no overshoot, small ripple and strong load capacity. The output voltage resolution is high, which can reach 1V resolution. The method comprises the following steps:
aiming at the problem of large alternating current ripple of the existing output high-voltage, the invention innovatively provides a high-voltage generation mode of a high-voltage direct-current power supply, and the switching frequency generated by the high-voltage source is configured to be 100KHz, so that the direct-current high-voltage ripple after high-voltage output filtering is small.
In order to solve the output voltage fluctuation caused by output load, the constant current charging is carried out to the set voltage through the current loop, and then the constant voltage stage of the voltage loop is carried out. The dynamic response of the system can be quickened by setting the adjusting proportion parameters of the two loops respectively. From the angle analysis of the control mode, the control mode based on peak current is adopted, so that PWM waves can be quickly adjusted cycle by cycle, and the change of system parameters can be quickly responded.
In order to realize high resolution of 1V, a singlechip is adopted to output a set voltage value, the set voltage value is input to the homodromous input end of an operational amplifier of a voltage loop, a sampling voltage of high voltage output is input to the reverse input end of the operational amplifier of the voltage loop, proportional-integral (PI) control is carried out through the operational amplifier, the output value is input to a peak current control circuit to carry out PWM (pulse width modulation) to finely regulate the output voltage of a BUCK circuit based on a control mode of peak current, and then the output of direct-current high voltage is regulated.
In order to realize no overshoot of voltage output, an integrating capacitor discharging circuit is added to realize control logic before the current loops to the voltage loop, and the integrating capacitor voltage of the voltage loop is precisely discharged to a desired steady-state value.
Drawings
Fig. 1 is a schematic structural diagram of a high-voltage non-overshoot dc power supply according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of an integrating capacitor discharging circuit according to a first embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and complete in conjunction with the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the present invention.
Example 1
Fig. 1 is a schematic structural diagram of a high-voltage dc power supply without overshoot according to a first embodiment of the present invention. A high-voltage non-overshoot direct-current power supply mainly comprises a main loop, a current loop (CC loop) and a voltage loop (CV loop).
Main loop: the high-voltage full-bridge rectifier circuit comprises a switching power supply, a BUCK circuit, a half-bridge DC-AC circuit, a high-frequency step-up transformer and a high-voltage full-bridge rectifier circuit which are electrically connected in sequence, wherein a capacitor C1 is connected in parallel after a resistor R1 is connected in series to the output side of the high-voltage full-bridge rectifier circuit, and the fixed duty ratio circuit is electrically connected with the half-bridge DC-AC circuit, so that a main loop of the high-voltage non-overshoot direct-current power supply is formed. The commercial power is output by a 24V bus through a switching power supply, and the switching power supply can adopt an exposed weft IRM-90-24 switching power supply. The voltage output by the switching power supply is regulated through the BUCK circuit, 0-24V voltage can be output, half-bridge chopping is finished through the half-bridge DC-AC circuit, PWM (pulse width modulation) of high frequency (100 KHz) of 0-12V is output to the high-frequency step-up transformer (10V: 1000V), high-frequency rectifying and filtering is finished through the high-voltage full-bridge rectifying circuit, and finally direct-current high-voltage (the actual requirement voltage range is 25V-1000V) is output. The resistor R1 is used for collecting output current and is used as feedback current for constant current loop control. The capacitor C1 functions to filter the output voltage.
A control section: the current loop and the voltage loop are divided. The circuit structure is as follows: the peak current control circuit is respectively and electrically connected with the isolation driving circuit, the AND gate logic circuit and the BUCK circuit, the isolation driving circuit is electrically connected with the BUCK circuit, the AND gate logic circuit is respectively and electrically connected with the current loop PI control circuit and the voltage loop PID control circuit, the current loop PI control circuit is electrically connected with the current isolation sampling circuit, the output side of the current isolation sampling circuit is connected with the resistor R1 in parallel, the voltage loop PID control circuit is respectively and electrically connected with the integrating capacitor discharging circuit and the voltage isolation sampling circuit, the output side of the voltage isolation sampling circuit is connected with the capacitor C1 in parallel, the singlechip is respectively and electrically connected with the current loop PI control circuit and the voltage loop PID control circuit, the singlechip is used for outputting a current set value and a voltage set value, and the singlechip adopts an STM32F407 singlechip. The peak current control circuit adopts a current mode PWM control chip UC3843.
CC ring: the current in the main loop is firstly collected and is input to an operational amplifier in a current loop PI control circuit of the CC loop through a current isolation sampling circuit to carry out PI regulation.
CV ring: and collecting the output high-voltage direct-current voltage, and inputting the high-voltage direct-current voltage to an operational amplifier in a voltage ring PID control circuit of the CV ring through a voltage isolation sampling circuit to carry out PID regulation.
The CC ring and the CV ring perform logic AND operation through an AND gate logic circuit and output the logic AND operation to a first pin of a current mode PWM control chip UC3843 in a peak current control circuit, the peak current control circuit performs peak current sampling from the BUCK circuit to finish a mode based on peak current control, PWM waves are output, and the PWM waves pass through an isolation driving circuit to drive MOS tubes of the BUCK circuit.
The control of the half-bridge DC-AC circuit adopts open loop control, the fixed duty cycle circuit adopts a voltage type PWM control chip KA3525A, fixed duty cycle output is set through a configuration KA3525A peripheral circuit, and the MOS tube of the half-bridge DC-AC circuit is driven through PWM with the fixed duty cycle configured through the fixed duty cycle circuit.
In order to make the output high-voltage direct-current voltage have no overshoot, an integrating capacitor discharging circuit is added in the embodiment of the invention, and the integrating capacitor discharging circuit is used for precisely discharging an integrating capacitor C65 in a voltage ring, as shown in fig. 2, and is a schematic structural diagram of the integrating capacitor discharging circuit in the first embodiment of the invention. The structure of the integrating capacitor discharging circuit is described as follows: the high input impedance differential sampling circuit comprises operational amplifiers U1, U2 and U3, wherein the operational amplifiers U2 and U3 form a high input impedance differential sampling circuit, a resistor R3 is electrically connected with a reverse input end of the U1, a resistor R2 is respectively electrically connected with a reverse input end and an output end of the U1, a resistor R4 and a resistor R5 are respectively electrically connected with a same-direction input end of the U1, and an output end of the U3 is electrically connected with a resistor R4; the two ends of the integrating capacitor C65 are respectively and electrically connected with the resistor R8 and the resistor R11, the resistor R8 is electrically connected with the homodromous input end of the U2, the resistor R7 is electrically connected with the reverse input end of the U2, the resistor R6 is respectively and electrically connected with the reverse input end and the output end of the U2, the output end of the U2 is electrically connected with the resistor R10, the R10 is electrically connected with the reverse input end of the U3, the resistor R9 is respectively and electrically connected with the reverse input end and the output end of the U3, the resistor R11 is electrically connected with the homodromous input end of the U3, and the output end of the U1 is respectively and electrically connected with the singlechip and the voltage ring PID control circuit through the control switch K.
The pulse is 500uS pulse output by the singlechip; logic refers to logic that controls the switch: when the output voltage reaches 95% of the set value, the singlechip interrupts the output of 500uS pulse; the control switch K is an electronic switch and is controlled by a singlechip pin, and is used for applying the output of the operational amplifier U1 to the reverse input end of the operational amplifier U4 and discharging C65.
The working principle of the integrating capacitor discharging circuit is described as follows: the voltage Uc65 of the integrating capacitor C65 is collected to the same-direction input end of the operational amplifier U1 through a differential sampling circuit with high input impedance formed by the operational amplifiers U2 and U3, and a steady-state value Kx+b expected by the integrating capacitor C65 is input to the reverse input end of the operational amplifier. The operational amplifier U1 performs a differential proportional operation on Uc65 and Kx+b. When the output feedback voltage Uf reaches 95% of the voltage set value Ug, the singlechip outputs a 500uS pulse, the control switch K is closed, and the output of the operational amplifier U1 acts on the inverting input end of the operational amplifier U4 through the resistor R12. In this process a release of the voltage to C65 to the desired value kx+b is achieved.
C65 is an integrating capacitor in the voltage loop PID control circuit, ug is a given value of the voltage loop PID control circuit, uf is a feedback value of the voltage loop PID control circuit, upid is an output value of the voltage loop PID control circuit, ig is a given value of the current loop PI control circuit, if is a feedback value of the current loop PI control circuit, and Ipi is an output value of the current loop PI control circuit. Vic is the input of the peak current control circuit. Before the current loop enters the voltage loop, uf < Ug, the voltage loop PID control circuit outputs Upid forward integral control to the highest value, generally about the power supply voltage of the operational amplifier, and after the control loop is switched into the voltage loop control from the current loop, uf > Ug can reach steady-state value from the highest value. The high dc voltage output during this process will overshoot.
The invention is characterized in that a circuit for accurately discharging an integrating capacitor C65 in a voltage ring PID control circuit is added, and the working principle is as follows: when the output voltage reaches 95% of the set value, a 500uS pulse is generated by the singlechip, and the voltage of the integrating capacitor C65 is firstly discharged to a desired steady-state value in the period. The specific implementation principle is that the integration capacitor C65 is subjected to differential sampling of high input impedance to obtain the collected voltage Uc65, then control of a proportional link is carried out with the steady state value kx+b of the expected voltage loop, finally feedback is carried out to the reverse input end of the voltage loop PID control circuit through control logic, and the Upid output by the voltage loop can be controlled to the expected steady state value before the current loop is switched into the voltage loop, so that the voltage loop can output on the expected steady state value when the current loop is switched into the voltage loop, and the overshoot is not generated in the output of the high-voltage direct-current voltage.
The key point of the invention is as follows:
(1) the invention improves the topology and control mode of the high-frequency switch DC high-voltage power supply generation: the commercial power generates a direct current bus through a switching power supply, voltage regulation is performed through a BCUK circuit, half-bridge inversion is performed, isolation boosting is performed through a high-frequency booster, and direct current high-voltage is output through full-bridge rectification filtering. The BUCK circuit adopts a control mode based on peak current, and the half-bridge inversion adopts open-loop duty cycle control.
(2) The invention improves the automatic switching control mode of the current loop and the voltage loop: when testing a high-capacity battery cell (capacitive load) before liquid injection, if a constant-current measure is not added, a constant-voltage source is applied to a capacitor, a moment large current can appear, and the battery cell is damaged.
In order to accelerate the dynamic response speed of the system, a diode D2 is arranged in the current loop PI control circuit, and a diode D1 is arranged in the voltage loop PID control circuit, as shown in the position of FIG. 2. The diodes D1 and D2 are RLS4148 diodes.
(3) The invention improves the control circuit and the control logic of the output voltage without overshoot: during the action of the current loop, the voltage loop does not reach the set value due to the feedback voltage, the PID control circuit of the voltage loop can regulate the output voltage to the maximum value, when the current loop cuts into the voltage loop, the voltage of the integrating capacitor of the voltage loop can be integrated reversely, the output of the voltage loop can be regulated from the maximum value to the correct PID output value, and during the period, the output voltage can be overshoot. Therefore, in order to solve the problem, a voltage loop integrating capacitor accurate discharging circuit is added, and when the output voltage reaches 95% of a set value, a 500uS pulse is generated by the singlechip, and the voltage of the integrating capacitor is firstly discharged to a desired steady-state value in the period. Thus, when the current loop cuts into the voltage loop, the output voltage is not overshoot.
Example two
For the main loop part in the first embodiment, the half-bridge type DC-AC circuit can be replaced by a full-bridge type DC-AC circuit according to the power difference of the high-voltage non-overshoot direct current power supply. The low-power high-voltage non-overshoot direct current power supply adopts a half-bridge DC-AC circuit, and the high-power high-voltage non-overshoot direct current power supply adopts a full-bridge DC-AC circuit.
In the embodiments of the present invention, technical features that are not described in detail are all existing technologies or conventional technical means, and are not described herein.
Finally, it should be noted that: the above examples are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention. Those skilled in the art will appreciate that: any person skilled in the art may modify or easily conceive of changes to the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention.
Claims (4)
1. The high-voltage non-overshoot direct-current power supply is characterized by comprising a switching power supply, a BUCK circuit, a DC-AC circuit, a high-frequency step-up transformer and a high-voltage full-bridge rectifying circuit which are electrically connected in sequence, wherein a resistor R1 is connected in series at the output side of the high-voltage full-bridge rectifying circuit, a capacitor C1 is connected in parallel at the output side of the high-voltage full-bridge rectifying circuit, a fixed duty ratio circuit is electrically connected with the DC-AC circuit, a peak current control circuit is respectively and electrically connected with an isolation driving circuit, an AND gate logic circuit and the BUCK circuit, the isolation driving circuit is electrically connected with the BUCK circuit, the AND gate logic circuit is respectively and electrically connected with a current loop PI control circuit and a voltage loop PID control circuit, the current loop PI control circuit is electrically connected with a current isolation sampling circuit, a resistor R1 is connected at the output side of the current isolation sampling circuit in parallel, the voltage loop PID control circuit is respectively and electrically connected with an integral capacitor discharge circuit and a voltage loop PID control circuit;
the integrating capacitor discharging circuit comprises operational amplifiers U1, U2 and U3, the operational amplifiers U2 and U3 form a high input impedance differential sampling circuit, the voltage of an integrating capacitor C65 is collected to the same-direction input end of the operational amplifier U1, a steady-state value Kx+b expected by the integrating capacitor C65 is input to the reverse input end of the operational amplifier, and the output end of the U1 is electrically connected with the singlechip and the voltage loop PID control circuit respectively through a control switch K.
2. The high voltage dc power supply without overshoot of claim 1, wherein the integrating capacitor discharging circuit has a structure of: the resistor R3 is electrically connected with the reverse input end of the U1, the resistor R2 is respectively electrically connected with the reverse input end and the output end of the U1, the resistor R4 and the resistor R5 are respectively electrically connected with the same-direction input end of the U1, and the output end of the U3 is electrically connected with the R4; the two ends of the integrating capacitor C65 are respectively and electrically connected with the resistor R8 and the resistor R11, the resistor R8 is electrically connected with the homodromous input end of the U2, the resistor R7 is electrically connected with the reverse input end of the U2, the resistor R6 is respectively and electrically connected with the reverse input end and the output end of the U2, the output end of the U2 is electrically connected with the resistor R10, the R10 is electrically connected with the reverse input end of the U3, and the resistor R9 is respectively and electrically connected with the reverse input end and the output end of the U3.
3. The high voltage DC power supply of claim 1 wherein the DC-AC circuit is a half-bridge DC-AC circuit or a full-bridge DC-AC circuit.
4. The high-voltage non-overshoot direct-current power supply according to claim 1, wherein the singlechip is an STM32F407 singlechip, and the peak current control circuit is a current mode PWM control chip UC3843.
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| CN202310564736.0A CN116317536B (en) | 2023-05-19 | 2023-05-19 | High-voltage non-overshoot direct-current power supply |
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