A high frequency voltage regulated power supply

Abstract

The utility model discloses a high-frequency voltage-stabilized power supply, comprising a control unit, a filter circuit unit, a bridgeless PFC boost circuit unit and an H-bridge inverter circuit unit, wherein the filter circuit unit is electrically connected to the bridgeless PFC boost circuit unit, and the bridgeless PFC boost circuit unit is electrically connected to the H-bridge inverter unit; the control unit controls the bridgeless PFC boost circuit unit and the H-bridge inverter unit through a drive circuit unit. The problem that the signal cannot be collected due to zero drift is solved, and soft and hard dual protection is provided for the circuit.

Description

Technical Field

[0001] The utility model relates to the technical field of voltage-stabilized power supplies, in particular to a high-frequency voltage-stabilized power supply. Background Art

[0002] With the development of science and technology, various precision equipment has emerged, and most of the equipment is powered by single-phase or three-phase mains electricity, and has certain requirements on the quality of voltage. With the continuous development of power electronic devices, a new generation of AC voltage stabilizers with power electronic switching devices as the core is gradually developing.

[0003] For example, a new type of high-frequency frequency-stabilized voltage power supply with a publication number of CN209150993U includes a control system, a main circuit power unit and a chassis. The control system includes a DC DC conversion part and a DC AC conversion part. The main circuit power unit includes a rectifier unit, a DC DC conversion unit and a DC AC conversion unit. The rectifier unit uses a rectifier bridge to convert AC power into DC power. The DC DC conversion part uses a PWM chip SG3525 as the control core. The main circuit power unit uses a BUCK BOOST step-up and step-down circuit structure to control the increase or decrease of the DC voltage by controlling the on and off of the IGBT module. The beneficial effects of the utility model are: the bulky power frequency isolation transformer is removed, the whole machine is small in size, light in weight, and low in cost, which can fully meet the needs of ordinary household users.

[0004] Another example is a high-frequency AC voltage-stabilized power supply circuit and control method with publication number CN114825978A, which includes: a main control board, an analog quantity acquisition unit, a phase-shifted full-bridge module, a series resonance module and a waveform correction circuit; wherein the main control board is used to realize power supply parameter setting and logic control; the phase-shifted full-bridge module is used to realize the conversion of AC power into high-voltage DC output, and the output voltage is continuously adjustable; the analog quantity acquisition unit is used to realize the output voltage acquisition and conversion of the phase-shifted full-bridge, and convert the output parameters into small signals and send them to the main control board; the series resonance module is used to realize high-frequency inversion. The control method includes: the main control board sets the power supply parameters, and performs logic control on the phase-shifted full-bridge module and the series resonance module. The present invention achieves the effects of high-frequency waveform correction and quasi-sinusoidal high-frequency voltage-stabilized output, and also achieves the effect of efficient energy transmission of multi-stage high-voltage isolation transformers.

[0005] However, the above technical solution is still slightly lacking in voltage stabilization accuracy and voltage stabilization speed, and cannot solve the problem of signal acquisition failure due to zero drift, and the protection effect of the circuit is not good. Utility Model Content

[0006] The utility model aims to solve the problem that signals cannot be collected due to zero drift, and at the same time provide soft and hard dual protection for the circuit.

[0007] The technical solution adopted by the utility model is: a high-frequency voltage-stabilized power supply, comprising a control unit, a filter circuit unit, a bridgeless PFC boost circuit unit and an H-bridge inverter circuit unit, wherein the filter circuit unit is electrically connected to the bridgeless PFC boost circuit unit, and the bridgeless PFC boost circuit unit is electrically connected to the H-bridge inverter unit; the control unit controls the bridgeless PFC boost circuit unit and the H-bridge inverter unit through a drive circuit unit.

[0008] As a further improvement of the present invention, the bridgeless PFC boost circuit unit includes two IGBT switches and an inductor L2 connected in series, and the two IGBT switches are connected in parallel with a capacitor C3.

[0009] As a further improvement of the present invention, the H-bridge inverter unit includes an H-bridge circuit composed of four IGBT switches, and an inductor L3 and a capacitor C4 constitute an output filter circuit.

[0010] As a further improvement of the present invention, the control unit is signal-connected to the display module and the protection circuit.

[0011] As a further improvement of the utility model, it also includes a detection circuit, the detection circuit signal is connected to the control unit, and the detection circuit is used to detect voltage, current and temperature.

[0012] As a further improvement of the present invention, the control unit adopts a DSP chip.

[0013] The beneficial effects of the utility model are as follows: the control of the bridgeless PFC boost circuit and the H-bridge inverter circuit is completed by the single-chip microcomputer, the detection circuit sends the real-time detection data of voltage, current and temperature to the single-chip microcomputer, and after calculation by the single-chip microcomputer, it is sent to the drive circuit unit and the display module. If the detection data is abnormal, the protection circuit implements real-time protection. The protection is divided into software protection and hardware protection. If overvoltage, undervoltage, overload, overtemperature, short circuit and other phenomena occur, the single-chip microcomputer program will stop the SPWM output, turn off the IGBT module in the bridgeless PFC boost circuit and the H-bridge inverter circuit, output zero voltage, and control the protection switch to disconnect at the same time, so as to realize the dual protection of software and hardware. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the utility model. DETAILED DESCRIPTION

[0015] Combine the following Figure 1 , the utility model is further explained.

[0016] Embodiment 1, as Figure 1As shown, a fast high-frequency regulated power supply includes a control unit, a filter circuit unit, a bridgeless PFC boost circuit unit and an H-bridge inverter circuit unit, wherein the filter circuit unit is electrically connected to the bridgeless PFC boost circuit unit, and the bridgeless PFC boost circuit unit is electrically connected to the H-bridge inverter unit; the control unit controls the bridgeless PFC boost circuit unit and the H-bridge inverter unit through a drive circuit unit.

[0017] The input AC power frequency 90-310V voltage passes through the filter circuit unit; it is sent to the bridgeless PFC boost circuit unit, boosted to 400V DC, and the voltage value is stabilized; then the DC is converted into AC sinusoidal 50Hz-220V AC through SPWM modulation and the H-bridge inverter circuit composed of IGBT, and output after passing through the filter circuit.

[0018] Furthermore, in order to improve the accuracy and speed of the bridgeless PFC boost circuit unit, the bridgeless PFC boost circuit unit includes two IGBT switches and an inductor L2 connected in series, and the two IGBT switches are connected in parallel with a capacitor C3.

[0019] Furthermore, in order to improve the accuracy and speed of the H-bridge inverter unit, the H-bridge inverter unit includes an H-bridge circuit composed of four IGBT switches, and its inductor L3 and capacitor C4 are output filter circuits. The LC filter circuit composed of the Sendust inductor and capacitor is used to filter out the high-frequency noise generated by the inverter module to obtain a smooth low THD and pure sinusoidal AC signal.

[0020] Furthermore, in order to improve the protection effect, the control unit signal is connected to the display module and the protection circuit; it also includes a detection circuit, the detection circuit signal is connected to the control unit, and the detection circuit is used to detect voltage, current and temperature.

[0021] Furthermore, in order to improve the effect of the entire power supply, the control unit is a single chip microcomputer, which uses a DSP chip. The DSP main chip realizes double edge control and dead zone control through a high-resolution enhanced pulse width modulator according to the voltage signal of the signal acquisition module to achieve the PWM drive signal required by the inverter module.

[0022] After power-on, the system initializes the control parameters and timer, PWM and display modules, detects the voltage and current signals and startup variables of the PFC boost module and the power inverter module, and then realizes the soft start of the boost module and the amplitude adjustment of the sine SPWM pulse width modulation technology according to the voltage and current signals. In this process, protections such as overvoltage, undervoltage, overload, overtemperature, and short circuit are realized, and information such as output and input voltage, current and power are displayed. In order to output the sine wave required by the inverter module, the isosceles triangle is used as the carrier, the sine wave is the modulation wave, and the intersection of the sine modulation wave and the triangular carrier determines the on-off moment of the switching device, thereby obtaining a series of rectangular pulse waveforms of equal amplitude and unequal width. According to the area equivalence principle, the area of ​​each rectangular wave is equal to the area of ​​the sine wave at the corresponding position. Therefore, the sequence of pulses is equivalent to the desired sine wave, which is the principle of sine pulse width modulation. The bipolar method is adopted, that is, within half a cycle of the sine modulation wave, the triangular carrier changes between positive and negative. The system bootstraps the loader and jumps to the main program entry to initialize related variables, control registers, and sine table, etc. Then it enables the required interrupts, starts the timer, and then loops through fault detection and protection, and waits for interrupts.

[0023] In order to form a complete voltage-stabilized power supply, a signal acquisition module is also included: including voltage, current and temperature signal acquisition. Input and output current acquisition: based on the linear current sensor circuit of the Hall effect with high precision and low offset, after amplification, the voltage signal suitable for the DSP is acquired. Voltage acquisition module: the voltage signal is obtained by high-precision resistor voltage division. Temperature detection circuit: collected by temperature-sensitive sensor. Display module: using liquid crystal or digital tube display, used to display input, output voltage, current and temperature, as well as power and fault protection code and other information. Since the above is the existing technology, it will not be repeated.

[0024] The control of the bridgeless PFC boost circuit unit and the H-bridge inverter circuit unit is completed by the single-chip microcomputer. The voltage, current, and temperature detection circuits send real-time detection data to the single-chip microcomputer, which is then calculated by the single-chip microcomputer and sent to the drive unit and display module. If the detection data is abnormal, the protection circuit will provide real-time protection. The protection is divided into software protection and hardware protection. If overvoltage, undervoltage, overload, overtemperature, short circuit, etc. occur, the single-chip microcomputer program will stop the SPWM output, turn off the IGBT modules in the bridgeless PFC boost circuit and the H-bridge inverter circuit, and output zero voltage. At the same time, the protection switch is controlled to be disconnected to achieve dual protection of software and hardware.

[0025] The technical parameters of Example 1 are as follows:

[0026] Product power: single-phase 350W-20KW (three-phase 6-60KW);

[0027] Working principle: Inverter double conversion;

[0028] Rated input voltage: single-phase 220V;

[0029] Rated input frequency: 50Hz, allowable frequency range 43-57Hz;

[0030] Input voltage range: single phase 90-310V;

[0031] Input voltage and output load range: 165-310V at 100% load, 135-165V at 80% load, 90-135V at 60% load;

[0032] Undervoltage protection: 90V, recovery working voltage 110V;

[0033] Overvoltage protection: 310V, recovery working voltage 290V;

[0034] Input power factor: 0.99;

[0035] Maximum output current: 2.6A-90A;

[0036] No-load power: <25W;

[0037] Startup mode: soft start;

[0038] Output voltage: 220V or 230V;

[0039] Voltage regulation accuracy: ±2%;

[0040] Voltage stabilization speed: 0ms;

[0041] Output waveform: pure sine wave;

[0042] Output frequency: 50Hz;

[0043] Output current: models range from small to large 2.6A-90A;

[0044] Protection time: ﹤200ms;

[0045] Output voltage non-linear distortion coefficient: linear load is ﹤1.5%, non-linear load is ﹤3%;

[0046] Crest factor: 3:1;

[0047] Overload capacity: ﹤105% continuous operation, 105-150% for no less than 5 seconds;

[0048] Efficiency: >97%;

[0049] Protection: output overload protection, electronic protection, with self-recovery function;

[0050] Short circuit protection, electronic protection, with self-recovery function;

[0051] Overheat protection, electronic protection, with self-recovery function;

[0052] Surge protection, varistor (2KV to ground), 1KV (between LN), drive -50μS;

[0053] Load protection against power disturbances (between phase and neutral) up to 2.5kHz;

[0054] Anti-interference range: 150KHz-30MHz;

[0055] LED indication: normal, overload / overheat, U﹥310V, U﹤90V;

[0056] Display screen: input voltage, output voltage, current, temperature and protection fault display, etc.;

[0057] Working environment temperature range: +5~+40℃;

[0058] Storage environment temperature range: -40~+40℃;

[0059] Cooling method: self-heating cooling, air convection; high power is air cooling;

[0060] Altitude: 3000m;

[0061] Protection grade: IP20;

[0062] Service life: >10 years.

[0063] Compared with traditional products, the product of this embodiment has the following characteristics:

[0064] 1. Wide voltage stabilization range, AC90-310V;

[0065] 2. Fast response time, voltage stabilization speed 0ms;

[0066] 3. Low loss, kilowatt loss is less than 25W;

[0067] 4. High efficiency, >97% or more;

[0068] 5. High power factor, >0.99;

[0069] 6. The output waveform is pure sine wave;

[0070] 7. Fast protection time, ﹤200ms;

[0071] 8. Wide anti-interference range, 150KHz-30MHz;

[0072] 9. Solved the problem of being unable to collect signals due to zero drift.

[0073] Those skilled in the art should be aware that the protection scheme of the present utility model is not limited to the above-mentioned embodiments, and various arrangements, combinations and transformations can be made on the basis of the above-mentioned embodiments. Without violating the spirit of the present utility model, various transformations of the present utility model fall within the protection scope of the present utility model.

Claims

1. A high frequency voltage regulated power supply, characterized in that It includes a control unit, a filter circuit unit, a bridgeless PFC boost circuit unit and an H-bridge inverter circuit unit. The filter circuit unit is electrically connected to the bridgeless PFC boost circuit unit, and the bridgeless PFC boost circuit unit is electrically connected to the H-bridge inverter unit. The control unit controls the bridgeless PFC boost circuit unit and the H-bridge inverter unit through a drive circuit unit.

2. A high frequency voltage regulated power supply according to claim 1, characterized in that The bridgeless PFC boost circuit unit comprises two IGBT switches and an inductor L2 connected in series, and the two IGBT switches are connected in parallel with a capacitor C3.

3. A high frequency voltage regulated power supply according to claim 1, characterized in that The H-bridge inverter unit includes an H-bridge circuit composed of four IGBT switches, and an inductor L3 and a capacitor C4 constitute an output filter circuit.

4. A high frequency voltage regulated power supply according to claim 1, characterized in that The control unit is signal-connected to the display module and the protection circuit.

5. A high frequency voltage regulated power supply according to claim 1, characterized in that It also includes a detection circuit, the detection circuit signal is connected to the control unit, and the detection circuit is used to detect voltage, current and temperature.

6. A high frequency voltage regulated power supply according to any one of claims 1 to 5, characterized in that The control unit adopts a DSP chip.

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