CN114928264A - Stable power supply and ultraviolet light power supply - Google Patents
Stable power supply and ultraviolet light power supply Download PDFInfo
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- CN114928264A CN114928264A CN202210653980.XA CN202210653980A CN114928264A CN 114928264 A CN114928264 A CN 114928264A CN 202210653980 A CN202210653980 A CN 202210653980A CN 114928264 A CN114928264 A CN 114928264A
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
- H02M7/53873—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with digital control
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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
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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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
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
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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
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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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
- H02M3/33507—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 with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33515—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 with automatic control of the output voltage or current, e.g. flyback converters with digital control
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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)
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Abstract
The invention discloses a stable power supply and an ultraviolet light power supply, wherein the stable power supply comprises: and the closed-loop control circuit is used for acquiring the bus current and the output alternating voltage in real time, monitoring whether the power supply power is equal to the preset power supply power or not, and if the power supply power is not equal to the preset power supply power, adjusting the frequency of the PWM wave so as to ensure that the output power is equal to the preset power and outputting a driving signal so as to ensure that the output power is kept stable. The invention adopts a closed-loop control circuit, collects the bus current and the output alternating voltage in real time, detects the power supply power in real time, adjusts the frequency of the PWM wave as long as the power supply power changes, ensures that the output power is equal to the preset power, ensures that the output power is kept stable, monitors in real time, adjusts, is flexible and changeable at any time, improves the anti-jamming capability of the power supply and improves the control precision of the power supply.
Description
Technical Field
The invention relates to the field of power supplies, in particular to a stable power supply and an ultraviolet light power supply.
Background
The inert gas load is internally provided with a high-voltage discharge electrode, the high-voltage electrode and the grounding shell are insulated by a ceramic sheath, and discharge is carried out between the tips of the high-voltage electrode, so that the inert gas is ionized, and an ultraviolet light power supply is formed. The ultraviolet light power supply can be used for medical sterilization, disinfection in the catering industry, sterilization and disinfection in crowded public places such as subways, high-speed railway stations, bus stations and schools.
Currently, there are many products of uv power sources in the industry. Through relevant research, the factors influencing the ignition of the inert gas are found to be many, such as gas pressure of a gas source, flow rate of the gas source, the form of a polymerization spray nozzle and the like. Once these factors are set, they cannot be changed (polymerization injection nozzle form) or the change rate is very slow (gas source pressure and gas source flow), and cannot meet the requirement of inert gas lighting under different conditions, and meanwhile, when any parameters such as power grid voltage, load state, inert gas flame body and the like fluctuate, the power supply cannot make a targeted adjustment response, so that the output inert gas flame body fluctuates synchronously, the ultraviolet light disinfection effect becomes poor, and even the device is burned down in severe cases. It can be seen that plasma power characteristics are a key technology affecting inert gas flame. The stabilized power supply which is applied in a commercialized way in China uses an open-loop half-bridge hard switch structure, so that the power efficiency of the power supply is low, the output power is uncontrollable, the stability is poor, the fault rate is high, the anti-interference capability is weak, the power supply is not suitable for being used in large batch, and the surface treatment requirement of a stable and controllable material is difficult to meet; therefore, a new solution to solve the above technical problems is urgently needed.
From the above, it can be seen that how to achieve power stabilization of power output of the power supply is a problem to be solved at present.
Disclosure of Invention
The invention aims to provide a power supply with stable power and an ultraviolet light power supply, and solves the problems of low power efficiency, uncontrollable output power, poor stability, high failure rate and weak anti-interference capability of the power supply in the prior art.
To solve the above technical problem, the present invention provides a stable power supply comprising:
the closed-loop control circuit is used for acquiring bus current and output alternating voltage in real time, calculating power supply power, monitoring whether the power supply power is equal to preset power supply power or not, and if the power supply power is not equal to the preset power supply power, adjusting PWM (pulse width modulation) wave frequency so that the output power is equal to the preset power and outputting an adjusted driving signal;
and the inverter circuit drives the switching tube to convert the input direct-current power supply into an alternating-current power supply according to the driving signal.
Preferably, the input end of the inverter circuit is connected to a conversion unit, the input end of the conversion unit is connected to an ac power supply, and the output end of the conversion unit is connected to the inverter circuit, so as to convert ac voltage into dc voltage;
the conversion unit includes:
the input end of the EMI circuit is connected with an external alternating current power grid and is used for filtering high-frequency pulse interference of the external alternating current power grid;
and the rectifying circuit receives the filtered alternating current voltage output by the EMI circuit, converts the filtered alternating current voltage into direct current voltage and outputs the direct current voltage. Preferably, the rectification circuit comprises any one of an uncontrolled rectification circuit, a semi-controlled rectification circuit or a fully controlled rectification circuit.
Preferably, the input end of the inverter circuit is connected to the PFC circuit, the input end of the PFC circuit is connected to the dc power supply, and the output end of the PFC circuit is connected to the input end of the inverter circuit, so as to boost and correct the voltage of the input power supply.
Preferably, the closed loop control circuit comprises:
the direct current acquisition circuit is used for acquiring the bus current;
the alternating voltage collector is used for collecting the output alternating voltage;
the digital control circuit is used for calculating power supply power according to the collected bus current and the output alternating voltage, judging whether the power supply power is equal to the preset power supply power or not, and when the power supply power is not equal to the preset power supply power, adjusting the frequency of a PWM signal so that the output power is equal to the preset power and outputting the adjusted PWM signal;
and the driving circuit is used for receiving the regulated PWM signal and generating a driving signal.
Preferably, the digital control chip comprises any one of an STM32 or a DSP.
Preferably, the inverter circuit includes any one of a full-bridge inverter circuit and a half-bridge inverter circuit.
Preferably, the method further comprises the following steps:
the input end of the resonant circuit is connected with the inverter circuit and is used for converting the square wave current flowing through the semiconductor switch tube into sine wave current;
and the input end of the booster circuit is connected with the output end of the resonance circuit, and the output end of the booster circuit is respectively connected with the load and the alternating voltage sampling circuit and is used for boosting the output voltage.
Preferably, the resonance circuit includes: any one of an LC resonance circuit, an LLC resonance circuit, and an LCC resonance circuit.
The invention also provides an ultraviolet light power supply, and the ultraviolet light power supply adopts any one of the stable power supplies.
The invention provides a power supply with stable power, which adopts a closed-loop control circuit to collect bus current and output alternating voltage in real time, monitors whether the power supply power is equal to the preset power supply power, and adjusts the PWM wave frequency if the power supply power is not equal to the preset power supply power so that the output power is equal to the preset power and outputs an adjusted driving signal. The power supply power is calculated by acquiring the input current and the voltage in real time, when the external power grid or the load state changes, the power supply power can be detected in real time, then the power supply power is adjusted and controlled in real time by using the control chip, the stability of the output power is ensured, the anti-interference capability of the power supply is improved by using the control circuit, and the control precision of the power supply is improved.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
Fig. 1 is a block diagram of a stable power supply according to an embodiment of the present invention;
FIG. 2 is a graph showing the relationship between the PWM wave frequency and the power of the power supply according to the present invention;
FIG. 3 is a block diagram of a stable power supply with AC input according to an embodiment of the present invention;
FIG. 4 is a circuit diagram of an uncontrolled rectifier circuit;
FIG. 5 is a circuit diagram of a half-controlled rectifying circuit;
FIG. 6 is a circuit diagram of a fully controlled rectifier circuit;
fig. 7 is a circuit diagram of a PFC circuit;
FIG. 8 is a circuit diagram of a full bridge inverter circuit;
FIG. 9 is a circuit diagram of a half-bridge inverter circuit;
FIG. 10 is a circuit diagram of an IR2113STRPBF driver chip;
FIG. 11 is a circuit diagram of an LC resonant circuit;
fig. 12 is a circuit diagram of a dc bus current sampling circuit.
Detailed Description
The core of the invention is to provide a power supply with stable power and an ultraviolet light power supply, the power of the power supply is detected in real time through a closed-loop control circuit to generate a driving signal, and then an inverter circuit is utilized to adjust the power of an output voltage to ensure stable voltage output.
In order that those skilled in the art will better understand the disclosure, reference will now be made in detail to the embodiments of the disclosure as illustrated in the accompanying drawings. It should be apparent that the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a block diagram of a stable power supply provided in the present invention, and the details are as follows:
the DC input circuit comprises a DC input, a PFC circuit, an inverter circuit, a driving circuit, an inverter circuit, a resonance circuit, a booster circuit, a sampling circuit and a digital control circuit.
The direct current power supply is connected with the input end of the PFC circuit, the output end of the PFC circuit is connected with the input end of the inverter circuit, the output end of the inverter circuit is connected with the input end of the resonant circuit, the output end of the resonator is connected with the input end of the booster circuit, and the output end of the booster circuit is connected with the load for supplying power.
The closed-loop control circuit includes: the device comprises a bus current sampling circuit, a digital control circuit, a driving circuit and an alternating voltage sampling circuit.
The bus current sampling circuit collects the current of the direct current power supply and uploads the current to the digital control circuit, the alternating current voltage sampling circuit collects the voltage output by the booster circuit and uploads the voltage to the digital control circuit, the power supply power is calculated, whether the power supply power is equal to the preset power supply power or not is judged, if the power supply power is not equal to the preset power supply power, the frequency of the PWM wave is adjusted to control the power supply power to be equal to the preset power supply power, a driving signal is generated through the driving circuit, and the inverter circuit is driven to work.
Research shows that the frequency of the PWM wave is inversely proportional to the power of the power supply, and the power of the power supply can be adjusted by adjusting the frequency of the PWM wave, so that the power of the whole power supply is kept stable. As shown in fig. 2, the control is performed in a frequency range after the highest point is selected, and in such a frequency range, the relationship between the controlled power supply and the PWM wave frequency can be approximated to be linear. In the figure, QS is the quality factor, P is the power of the power source,
the frequency of the PWM wave.
The input direct-current voltage is 9-32V, the output direct-current voltage enters a PFC circuit, namely a power factor correction circuit, the PFC circuit is mainly used for expanding the power supply range of the input voltage, improving the power factor of electric equipment and improving the power utilization rate, and meanwhile, the circuit adopts pulse frequency control and can be used as a booster circuit. After passing through the PFC circuit, the voltage of a direct current bus reaches 24-800V, a direct current bus voltage signal enters an inverter circuit (half-bridge inverter or full-bridge inverter), and a driving signal of the inverter circuit is generated by a signal output by a digital control circuit through the driving circuit. The high-frequency ac signal output from the inverter circuit enters a resonant circuit (e.g., LC resonance, LLC resonance, LCC resonance). After passing through the resonant circuit, the voltage signal enters the booster circuit and finally outputs high-voltage and high-frequency alternating-current voltage, and finally acts on a load.
The first stable power supply provided by this embodiment adopts a closed-loop control circuit to collect bus current and output ac voltage in real time, and monitors whether power supply power is equal to preset power supply power, and if the power supply power is not equal to the preset power supply power, adjusts the PWM wave frequency so that the output power is equal to the preset power, and outputs an adjusted driving signal. The power supply power is calculated by acquiring the input current and voltage in real time, when the external power grid or the load state changes, the power supply power can be detected in real time, then the control chip is used for adjusting and controlling in real time, the output voltage is ensured to be stable, the anti-interference capability of the power supply is improved by the control circuit, and the control precision of the power supply is improved.
The present invention further provides a stable power source for an ac power source, please refer to fig. 3, fig. 3 is a structural block diagram of a stable power source for an ac power source; the specific situation is as follows:
the power supply circuit mainly comprises an EMI circuit, a rectifying circuit, a PFC circuit, an inverter circuit, a driving circuit, an inverter circuit, a resonance circuit, a booster circuit, a sampling circuit and a digital control circuit.
After an Alternating Current (AC) power supply is input, the AC power supply passes through the EMI circuit, and the main function is to filter the interference of high-frequency pulses of an external power grid to the power supply and simultaneously play a role in reducing the electromagnetic interference of the AC power supply to the outside. The alternating voltage passing through the EMI circuit enters the next stage of rectification circuit, and either an uncontrolled rectification circuit topology or a semi-controlled rectification circuit topology or a fully controlled rectification circuit topology can be adopted. After passing through the rectifying circuit, the output direct-current voltage enters a PFC circuit, namely a power factor correction circuit, which is mainly used for expanding the power supply range of the input voltage, improving the power factor of electric equipment and improving the power utilization rate. After passing through the PFC circuit, the voltage of the direct current bus reaches 24-800V, a direct current bus voltage signal enters an inverter circuit, and a driving signal of the inverter circuit is generated by a signal output by a digital control circuit through a driving circuit. The high-frequency alternating current signal output by the inverter circuit enters the resonant circuit. After passing through the resonant circuit, the voltage signal enters the booster circuit and finally outputs a high-voltage high-frequency alternating-current voltage, and finally acts on a load.
The rectifier circuit can be an uncontrolled rectifier circuit or a controllable rectifier circuit (semi-controlled or fully controlled). Fig. 4 shows an uncontrolled rectifier circuit, fig. 5 shows a half-controlled rectifier circuit, and fig. 6 shows a full-controlled rectifier circuit. The input alternating current is rectified to direct current through this circuit. And then input into the next stage PFC circuit.
In this embodiment, an EMI circuit and a rectifier circuit are added to an input terminal of a stable power supply to apply the power supply to an ac power grid, and first, an ac power is filtered by the EMI circuit to remove interference of high frequency pulses of an external power grid to the power supply, then, the ac power is converted into a dc power by the rectifier circuit, and then, the dc power is corrected by a PFC circuit, and is input to an inverter to be converted into a stable power supply, and a closed-loop control circuit is used to monitor in real time to keep the circuit at a stable output power. The invention is suitable for a plurality of scenes, and is not only limited to the places of direct current power supplies.
The PFC circuit can be seen as a boost type boost circuit. As shown in fig. 7; VCC1 is the dc power supply input terminal, L3 is the energy storage inductance, and D6 is the fast recovery diode. C8 is a dc bus capacitor. Q1 is a switch tube. R6 and R9 are divider resistors, and D7 is a TVS diode and is mainly used for controlling the gate voltage of Q1 and preventing the Q1 from being damaged due to overlarge voltage. The C9 and the R13 form a current Ids circuit loop of a drain electrode and a source electrode. R19 is a DC bus current sampling resistor, which forms a sampling current circuit. The working mode of the PFC is mainly to carry out error calculation on feedback signals of a reference voltage and an output voltage Vdc _ FB, achieve power factor correction by utilizing the relation between Ids and a steamed bread wave, and simultaneously achieve the effects of energy storage and discharge of an inductor L3 by controlling the on and off of an MOS tube Q1 through outputting Vgs, so that the output voltage reaches a stable value. C10 is a DC voltage-stabilizing capacitor, the upper end of which is connected with VCC1 and the lower end of which is connected with GND 1. The left end of the energy storage inductor L3 is connected with the upper end of the C10, and the right end of the L3 is connected with the anode of the D6. The drain of the tube Q1 is connected with the anode of D6, and the drain is connected with the upper end of the capacitor C9. The lower end of the capacitor C9 is connected with the upper end of the resistor R13, and the lower end of the resistor R13 is connected with the gate of the Q1 tube. The upper end of the R9 is connected with the right end of the R6. D7 is at R9 both ends, and D7 both ends are also respectively at Q1 tube grid and gate, play the steady voltage effect. And C8 is a DC bus voltage stabilizing capacitor. R14 plays a role in voltage division, and R19 achieves the function of sampling the direct current bus current. Through the PFC circuit, the input energy is boosted and power is corrected, the power factor of the electric equipment can be improved, the power utilization rate is improved, and a stable high-quality power supply is provided for subsequent circuits.
The inverter circuit in the power supply can be composed of a full-bridge inverter circuit or a half-bridge inverter circuit. The full-bridge inverter circuit is shown in fig. 8, and the half-bridge inverter circuit is shown in fig. 9. The bus voltage is added at two ends of the full-bridge inverter circuit or the half-bridge inverter circuit, and the switch tube converts the bus voltage into high-voltage high-frequency alternating current under the action of a driving signal of the driving circuit, inputs the alternating current into a next-stage resonant circuit, and finally inputs the alternating current into the step-up transformer to be stepped up and act on a load.
As shown in fig. 10, a digital control chip of the driving circuit (for example, an IR2113STRPBF driving chip, or other driving chips may be used) includes, but is not limited to, STM32 and DSP, and a PWM signal sent by the digital control chip is converted into a signal VO _ A, VO _ B that can drive a semiconductor switching transistor (silicon carbide, gallium nitride MOSFET). The pin 1 of the driving chip IR2113STRPBF is connected with the cathode of D14 and the left end of R35, the right end of R35 and the anode of D14 are respectively connected with the left end and the right end of R34, and finally a semiconductor switch tube driving signal VO _ B is output. The 8 pins of the driving chip are connected with the cathode of D13 and the left end of R32, the right end of R32 and the anode of D13 are respectively connected with the left end and the right end of R30, and finally a driving signal VO _ A is output. The pin 2 is connected with GND. The 7 feet are connected with one ends of D37, C22, D12 and R87. The other ends of D37 and C22 are connected with VS _ 2113. The right end of R88 is connected with DC bus voltage. The anode of D12 was connected to R89, and the other end of R89 was electrically connected to an auxiliary. Pin 15 is connected to GND. Pins 12 and 14 are respectively used as input ends of PWM signals sent by the digital control chip, and the pins are respectively connected with R29 and R33. R29 and R33 are grounded respectively. Pin 13 is electrically connected to the auxiliary via R31. The pin 6 is VS-2113, and the pin 11 is connected with the auxiliary power supply end. And 3 pins are auxiliary power supply ends. Pins 3 and 11 are grounded through C21 and C20, respectively. The 4 feet, the 5 feet, the 9 feet, the 10 feet and the 16 feet are suspended in the air.
The resonant circuit may use LC resonance, LLC resonance, LCC resonance. Here, taking an LC resonant circuit as an example, describing the operating principle of the resonant circuit and the boost circuit, as shown in fig. 11, C68 is used as a resonant capacitor in the LC resonant circuit and a self inductor in a transformer T1 is used to implement LC resonance, thereby implementing soft switching, which can greatly reduce the heat generated by a switching tube, and provide a guarantee for long-term stable and effective operation of the whole system. The transformer T1 boosts the inverted output voltage and applies it across the rear stage inert gas load. C68 is connected to pin 3 of transformer, pin 3 of transformer also corresponds to INV _ A, and pin 4 of transformer corresponds to INV _ B. Pins 5 and 10 of the transformer correspond to the two pins HV +, HV-of the ac output voltage. Pins 1 and 2 of the transformer respectively control the alternating voltage sampling pins of the chip in a digital mode. In this embodiment, the center tap (i.e., the 5-pin and 10-pin center taps) of the transformer may be grounded, may not be grounded, or may be connected to the primary winding. By using an LC (or LLC, LCC) voltage series resonance circuit, the current flowing through the switching tube is changed into sine wave instead of square wave, parameters of an inductor L and a capacitor C are well regulated, so that the switching tube is switched on or off when the sine current is zero, and the switching loss of a semiconductor power device (such as silicon carbide, gallium nitride and MOSFET) can be greatly reduced.
As shown in fig. 12, in the dc bus current sampling circuit, the current of the dc bus is reduced by a certain factor by an operational amplifier U10B, and then sent to a digital control chip (STM32, DSP, etc.) for closed loop calculation. D33 is a schottky diode and is mainly used for preventing surge, clamping and protecting circuits. The L11 mainly suppresses the current variation and prevents the subsequent circuit from being damaged by the excessive current variation. R61, R62 and R60 are used for reducing the electric signals to make the electric signals suitable for entering the digital control chip. Two ends of D33 are connected with GND1 and GND. L11 is connected with GND1, the other end is connected with C50 to form a filter circuit, and the other end of C50 is connected with GND. R62 is connected to pin 6 of U10B. R64 is connected with the 5 pin of U10B, and R65 is connected with the 5 pin at one end and GND at the other end. The pins 6 and 7 of the U10B are connected through a resistor R60, and determine the amplification factor of the operational amplifier circuit together with R61 and R62. 4 feet and 8 feet are suspended. The 7 pin is fed with the Idc _ avg signal output by the R63 for power closed loop operation.
In the embodiment, the PFC circuit is used, so that the circuit realizes a wide-range voltage input technology, and meanwhile, the efficiency of the power supply can be improved, and the power utilization rate is improved. Utilize LC (or LLC, LCC) voltage series resonance circuit, make the electric current that flows through the switch tube become the sine wave rather than the square wave, it can make the switch tube switch on or turn-off when sinusoidal current zero passage to adjust LC parameter, thereby the switching loss of greatly reduced semiconductor power device (for example carborundum, gallium nitride, MOSFET), this kind of soft switching technique is applicable to high-pressure low current type high-power switching power supply, can make switching loss greatly reduced, power efficiency improves by a wide margin, the heat that gives off is little, through closed-loop control circuit, make power invariable, power supply interference killing feature has been promoted, power control accuracy has been promoted, the stable work of carrier has been guaranteed, and satisfy mass production application demand.
The embodiment of the invention also provides an ultraviolet light power supply, and the ultraviolet light power supply adopts the stable power supply of any one of the embodiments.
The stabilized power supply provided by the present invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. A regulated power supply, comprising:
the closed-loop control circuit is used for acquiring bus current and output alternating voltage in real time, calculating power supply power, monitoring whether the power supply power is equal to preset power supply power or not, and if the power supply power is not equal to the preset power supply power, adjusting PWM (pulse-width modulation) wave frequency so that the output power is equal to the preset power and outputting an adjusted driving signal;
and the inverter circuit drives the switching tube to convert the input direct-current power supply into an alternating-current power supply according to the driving signal.
2. The stable power supply of claim 1, wherein the input terminal of the inverter circuit is connected to a conversion unit, the input terminal of the conversion unit is connected to an ac power source, and the output terminal of the conversion unit is connected to the inverter circuit for converting an ac voltage to a dc voltage;
the conversion unit includes:
the input end of the EMI circuit is connected with an external alternating current power grid and is used for filtering high-frequency pulse interference of the external alternating current power grid;
and the rectifying circuit receives the filtered alternating current voltage output by the EMI circuit, converts the filtered alternating current voltage into direct current voltage and outputs the direct current voltage.
3. The regulated power supply according to claim 2, wherein said rectifier circuit comprises any of an uncontrolled rectifier circuit, a half-controlled rectifier circuit or a fully controlled rectifier circuit.
4. The stabilized power supply according to claim 1, wherein the input terminal of the inverter circuit is connected to a PFC circuit, the input terminal of the PFC circuit is connected to a dc power supply, and the output terminal of the PFC circuit is connected to the input terminal of the inverter circuit, for boosting and correcting the voltage of the input power supply.
5. The regulated power supply of claim 1, wherein said closed loop control circuit comprises:
the direct current acquisition circuit is used for acquiring the bus current;
the alternating voltage collector is used for collecting the output alternating voltage;
the digital control circuit is used for calculating power supply power according to the collected bus current and the output alternating voltage, judging whether the power supply power is equal to the preset power supply power or not, and when the power supply power is not equal to the preset power supply power, adjusting the frequency of a PWM signal so that the output power is equal to the preset power and outputting the adjusted PWM signal;
and the driving circuit is used for receiving the regulated PWM signal and generating a driving signal.
6. The regulated power supply of claim 5, wherein said digital control chip comprises any one of an STM32 or a DSP.
7. The regulated power supply according to claim 1, wherein said inverter circuit comprises any one of a full-bridge inverter circuit and a half-bridge inverter circuit.
8. The regulated power supply of claim 1, further comprising:
the input end of the resonance circuit is connected with the inverter circuit and is used for converting the square wave current flowing through the semiconductor switch tube into sine wave current;
and the input end of the booster circuit is connected with the output end of the resonance circuit, and the output end of the booster circuit is respectively connected with the load and the alternating voltage sampling circuit and is used for boosting the output voltage.
9. The regulated power supply of claim 8, wherein said resonant circuit comprises: any one of an LC resonance circuit, an LLC resonance circuit, and an LCC resonance circuit.
10. An ultraviolet light power supply, characterized in that the ultraviolet light power supply adopts the stable power supply of any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210653980.XA CN114928264A (en) | 2022-06-10 | 2022-06-10 | Stable power supply and ultraviolet light power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210653980.XA CN114928264A (en) | 2022-06-10 | 2022-06-10 | Stable power supply and ultraviolet light power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114928264A true CN114928264A (en) | 2022-08-19 |
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ID=82814213
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210653980.XA Withdrawn CN114928264A (en) | 2022-06-10 | 2022-06-10 | Stable power supply and ultraviolet light power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114928264A (en) |
-
2022
- 2022-06-10 CN CN202210653980.XA patent/CN114928264A/en not_active Withdrawn
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Application publication date: 20220819 |