TWM448852U - Power supply - Google Patents

Description

Power Supplier

This creation relates to the field of power supply technology, and more particularly to a power supply.

At present, the common voltage regulators are mainly divided into contact type and inductive voltage regulators, and the universal rated voltage regulation range is between 0 and 600V. If the maximum demand voltage is greater than 600V, the output capacity needs to be customized under certain conditions, whether it is a contact regulator or an inductive regulator. The contact type is prone to sparks during the pressure regulation process, and the service life is easily shortened, and the inductive regulator is more difficult to construct than the existing contact type regulator. In the above two voltage regulation methods, as the required voltage range becomes higher, the volume and weight of the voltage regulator will increase correspondingly, so that the cost is much higher than the cost of the existing specifications. In addition, regardless of the voltage regulation method, the output frequency is determined by the frequency of the mains, and adjustment cannot be achieved, which has great limitations in practical applications.

The existing voltage regulators generally use contact voltage regulators and inductive voltage regulators: small-capacity power supplies are generally regulated by contact voltage regulators, and their working principle is similar to that of sliding resistors, and is not like a transformer with a different number of coils. The voltage regulation is realized, and the spark is easily generated during the adjustment process. The service life of the contactor coil becomes the bottleneck of the development of the large-capacity voltage regulator, and the output voltage is not isolated from the primary side.

Inductive voltage regulators are determined by their working principle and structure, and the manufacturing cost is relatively high, especially for large-capacity products. In addition, if the eccentricity of the single-phase product rotor reaches a certain value, it is easy to generate operating vibration and noise.

Now with the emergence of the emerging industry of 690V power supply, the voltage regulator's voltage regulation range (0~600V) is far from meeting the voltage regulation and frequency regulation requirements of 690V products, so the voltage regulator power supply is becoming more and more important. It is.

In general product testing, there must be an adjustable power supply that meets the requirements of the technical standards. Usually, a suitable voltage regulator is selected in the front stage of the test transformer, and the voltage of the voltage regulator is adjusted to make the test transformer output meet the required, stepless continuous and uniform test voltage.

In addition to the basic parameters such as output capacity, phase number, frequency, and output voltage variation range, the test regulator should meet the test requirements. It is also required that the regulator should have: (1) The output voltage quality is good. If the output voltage waveform of the regulator is required to be as close as possible to the sine wave; the lower limit of the output voltage is preferably zero; (2) The voltage regulation characteristic is good. If the voltage regulator is required to be too large, the voltage regulation characteristic curve is smooth and linear; the adjustment is convenient and reliable.

However, there are some shortcomings in the prior art: First, the maximum voltage regulation range of the general voltage regulator is 0~600V, and the voltage regulation range is narrow, which is more and more unable to meet the needs of emerging markets; second, the output frequency of the voltage regulator is generally The fixed frequency of the mains is 50Hz, which cannot be adjusted, and has great limitations. Thirdly, the regulators in the market with over 600V voltage regulation range need to be customized, and the cost is high. Fourth, the regulator has less protection and is easy to operate. Damage, high maintenance costs. Therefore, there is a need for an FM power supply.

The purpose of this creation is to solve the above problems, and to provide a power supply that not only adjusts the voltage according to demand, but also adjusts the frequency to meet the demand. In addition, this creation also has protection functions such as overcurrent, overload, overvoltage, and output short circuit.

In order to achieve the above objectives, the technical solution adopted by this creation is:

A power supply device includes a transformer, the power supply further includes a frequency converter and a filter module; the frequency converter is electrically connected to an external three-phase AC power grid; the frequency converter is electrically connected to the filter unit; the filter module Electrically connected to the transformer; the transformer is electrically connected to an external device.

Further, the filtering module includes a first inductor, a second inductor, a third inductor, a first capacitor, a second capacitor, and a third capacitor; and the first output end of the inverter passes through the first inductor and the first capacitor connected in series The second input end of the transformer is electrically connected, and the first output end of the frequency converter is electrically connected to the first input end of the transformer through a first inductance connected in series; the second output end of the frequency converter passes through the second inductance connected in series And the second capacitor is electrically connected to the third input end of the transformer, and the second output end of the inverter is electrically connected to the second input end of the transformer through the second inductor connected in series; the third output of the frequency converter The terminal is electrically connected to the first input end of the transformer through the third inductor and the third capacitor connected in series, and the third output end of the inverter is electrically connected to the third input end of the transformer through the third inductor connected in series.

Further, the power supply further includes an inductor module and a capacitor module; the transformer is sequentially connected to the external device through the inductor module and the capacitor module.

Further, the inductor module includes a fourth inductor, a fifth inductor, and a sixth inductor; the capacitor module includes a fourth capacitor, a fifth capacitor, and a sixth capacitor; the first output of the transformer passes through the fourth inductor and the capacitor of the inductor module The fourth capacitor of the module is grounded, and the first output of the transformer passes through the fourth inductor of the inductor module and the external device. The first input end of the transformer is electrically connected; the second output end of the transformer is grounded through the fifth inductor of the inductor module and the fifth capacitor of the capacitor module, and the fifth output end of the transformer passes through the fifth inductor of the electronic control module The second input end of the external device is electrically connected; the third output end of the transformer is grounded through the sixth inductor of the electronic control module and the sixth capacitor of the capacitor module, and the third output end of the transformer passes the sixth of the electronic control module The inductor is electrically connected to the third input of the external device; the fourth output of the transformer is grounded through the ground wire.

Further, the power supply further includes a phase control card; the phase control card is electrically connected to the three-phase AC power grid, the transformer, and the frequency converter, respectively.

Further, the first output end of the transformer is electrically connected to the first input end of the phase control card via the inductor module and the capacitor module; the second output end of the transformer is connected to the phase control via the inductor module and the capacitor module The second input end of the card is electrically connected to the third input end of the phase control card via the inductor module and the capacitor module; the first output end of the three-phase AC power grid is The fourth input end of the phase control card is electrically connected; the second output end of the three-phase AC power grid is electrically connected to the fifth input end of the phase control card; the third output end of the three-phase AC power grid and the phase The sixth input end of the control card is electrically connected; the output end of the phase control card is electrically connected to the micro processing unit of the frequency converter through a control signal.

Further, the frequency converter of any of the above, further comprising a rectifying unit, a filtering unit, an inverting unit, a braking unit, a driving unit and a soft opening unit.

The positive effects of this creation are: 1) the voltage that can be supplied to the power supply through the transformer The adjustment is made, the voltage regulation range is wide, the linearity is good, the phase is synchronized with the commercial power, and the output voltage is isolated from the commercial power.

2) The frequency converter can be adjusted by using the frequency converter, and the application range is wide.

3) The power supply of the present invention has multiple protections such as overcurrent, overload, overvoltage, and output short circuit.

4) The volume and weight of the entire FM voltage regulator are greatly reduced, and the cost is reduced by at least half.

5) The life of the entire FM voltage regulator is also greatly improved.

The specific implementation of the authoring power supply will be described below with reference to the accompanying drawings.

Referring to FIG. 1 , the power supply 100 of the present invention includes a frequency converter 120, a filter module 130 and a transformer 140; the frequency converter 120 is electrically connected to an external three-phase AC power grid 110; the frequency converter 120 and the The filter module 130 is electrically connected to the transformer 140; the transformer 140 is electrically connected to the external device 150. The three-phase AC grid 110 is used to provide a fixed voltage and a fixed frequency AC power source. In general, the fixed voltage is 380 volts; the fixed frequency is 50 Hz, while in some countries it is 60 Hz. The three-phase outputs of the three-phase AC grid 110 are R phase, S phase, and T phase, respectively. The first output end R of the three-phase AC power grid 110 is electrically connected to the first input end R of the frequency converter 120; the second output end S of the three-phase AC power grid 110 and the second input end S of the frequency converter 120 Electrical The third output terminal T of the three-phase AC grid 110 is electrically connected to the third input terminal T of the frequency converter 120.

The frequency converter 120 is a power control device that converts a power frequency (for example, 50 Hz) power source to another frequency by using a power semiconductor device as an on-off function. Referring to FIG. 2, the frequency converter 120 includes a rectifying unit 211, a filtering unit 212, an inverting unit 213, a braking unit 214, a driving unit 215, a soft start unit 216, and a micro processing unit 217. The rectifying unit 211 is configured to convert the input AC voltage into a DC voltage. The soft start unit 216 is electrically connected to the rectifying unit 211 and the filtering unit 212 respectively. The soft start unit 216 is configured to limit the magnitude of the charging current of the DC voltage output by the rectifying unit 211 to the filtering unit 212 to reduce the charging current pair. The filter unit 212 is electrically connected to the soft start unit 216 for storing energy and filtering to reduce voltage fluctuations. The inverting unit 213 is electrically connected to the filtering unit 212 for converting DC power into AC power of a required frequency, generally through a three-phase bridge inverter circuit to perform the above functions. When the on/off of the main switch in the inverter unit 213 is regularly controlled, a three-phase AC output waveform of an arbitrary frequency can be obtained. The braking unit 214 is electrically connected to the filtering unit 212. The micro processing unit 217 is electrically connected to the inverter unit 213 through the driving unit 215, is used for switching control of the inverter unit 213, voltage control of the rectifying unit 211, and completing various protection functions (for example, overvoltage, over Flow, overload or output short circuit protection). After the inverter 120 is powered on and set to operate normally, the inverter 120 outputs a voltage range of 0 to a rated voltage, and the voltage becomes a sine wave after passing through the filter module 130 electrically connected to the inverter 120.

The filtering module 130 includes a first inductor L1, a second inductor L2, a third inductor L3, a first capacitor C1, a second capacitor C2, and a third capacitor C3. The filtering module 130 is configured to filter the output voltage of the frequency converter 120. Referring to FIG. 3, in the present embodiment, the first output terminal U' of the inverter 120 is electrically connected to the second input terminal V' of the transformer 140 through the first inductor L1 and the first capacitor C1 connected in series. At the same time, the first output terminal U' of the frequency converter 120 is electrically connected to the first input terminal U' of the transformer 140 through the first inductor L1 connected in series. The second output terminal V' of the frequency converter 120 is electrically connected to the third input terminal W' of the transformer 140 through the second inductor L2 and the second capacitor C2 connected in series, and the second output terminal V' of the frequency converter 120 The second input terminal V' of the transformer 140 is electrically connected through the inductor L1 connected in series. The third output terminal W' of the inverter 120 is electrically connected to the first input terminal U' of the transformer 140 through the third inductor L3 and the third capacitor C3 connected in series, and the third output terminal W' of the inverter passes The third inductor L3 connected in series is electrically connected to the third input terminal W' of the transformer 140.

The transformer 140 is used to amplify or reduce the input voltage of the filter module 130 by a certain ratio, and can change the transformer 140 into an isolation transformer or a non-isolated transformer according to requirements. In the present creation, as shown in FIG. 3, after the output voltage of the external three-phase AC power grid 110 is sent to the frequency converter 120, the frequency converter 120 outputs the voltage of the adjustable voltage and the frequency modulation, and is filtered by the filtering module 130. Then, as the input of the transformer 140, the transformer 140 can perform voltage regulation according to a certain ratio to meet customer requirements, so that the output of the inverter 120 and the transformer 140 can provide an adjustable voltage, frequency modulation power supply, and can be more Precise control of the power supply to achieve The purpose of this creation.

In the preferred embodiment of the present invention, the power supply 100 further includes an inductor module 410 and a capacitor module 420. The inductor module 410 and capacitor module 420 are used for filtering. The transformer 140 is sequentially connected to the external device 150 through the inductor module 410 and the capacitor module 420. In other embodiments of the present invention, other modules having a filtering function may be electrically connected to the transformer, and the module having the filtering function may be configured as a RC filter module composed of a set of resistors and a set of capacitors, or Set as a LR filter module consisting of a set of inductors and a set of resistors.

Referring to FIG. 4, in the preferred embodiment of the present invention, the inductor module 410 includes a fourth inductor L4, a fifth inductor L5, and a sixth inductor L6. The capacitor module 420 includes a fourth capacitor C4, a fifth capacitor C5, and a sixth capacitor C6. The first output terminal U of the transformer 140 is grounded through the fourth inductor L4 of the inductor module 410 and the fourth capacitor C4 of the capacitor module 410, while the first output terminal U of the transformer 140 passes through the fourth inductor L4 of the inductor module 410 and the outside. The first input terminal U of the device 150 is electrically connected. The second output terminal V of the transformer 140 is grounded through the fifth inductor L5 of the inductor module 410 and the capacitor C5 of the capacitor module 420, and the second output terminal V of the transformer 140 passes through the fifth inductor L5 of the inductor module 410 and the outside. The second input V of the device 150 is electrically connected. The third output terminal W of the transformer 140 is grounded through the sixth inductor L6 of the inductor module 410 and the sixth capacitor C6 of the capacitor module 420, while the third output terminal W of the transformer 140 passes through the sixth inductor L6 of the inductor module 410 and the outside. The third input terminal W of the device 150 is electrically connected; the fourth output terminal N of the transformer 140 is grounded through a ground line.

Referring to FIG. 4 and FIG. 3, the difference between FIG. 4 and FIG. 3 is that a new set of inductors and a set of capacitors are added to the output of the transformer 140 in the former figure, and the main function of the inductor and capacitor is filtering. After the output voltage of the transformer 140 passes through the inductor module 410 and the capacitor module 420, the output performance becomes better.

In another preferred embodiment of the present invention, the power supply 100 further includes a phase control card 510. The phase control card 510 is electrically connected to the three-phase AC power grid 110, the transformer 140, and the frequency converter 120, respectively.

Referring to FIG. 5, in the other preferred embodiment, the first output terminal U of the transformer 140 is electrically connected to the first input terminal U of the phase control card 510 via the inductor module 410 and the capacitor module 420. The second output terminal V of the transformer 140 is electrically connected to the second input terminal V of the phase control card 510 via the inductor module 410 and the capacitor module 420. The third output terminal W of the transformer 140 is electrically connected to the third input terminal W of the phase control card 510 via the inductor module 410 and the capacitor module 420. The first output R of the three-phase AC grid 110 is electrically connected to the fourth input R of the phase control card 510. The second output terminal S of the three-phase AC power grid 110 is electrically connected to the fifth input terminal S of the phase control card 510; the third output terminal T of the three-phase AC power grid 110 and the sixth input terminal T of the phase control card 510 Electrical connection. The output of the phase control card 510 is electrically coupled to the microprocessor unit 217 of the frequency converter 120 via a control signal.

Referring to Figures 5 and 4, the difference between Figure 5 and Figure 4 is the addition of a phase control card 510 to the former. The phase control card 510 is used to feedback the output voltage of the transformer 140 as a voltage closed loop control and to output the output of the transformer 140. The output voltage of the voltage and three-phase AC grid 110 is simultaneously input into the phase control card 510. The two power supply information is processed on the phase control card 510 and then transmitted to the microprocessor unit 217 of the inverter 120. The processing of processing unit 217 effects that the three-phase outputs (U, V, W) of regulating transformer 140 and the input phases (R, S, T) of three-phase AC grid 110 remain synchronized. In this way, not only the voltage of the power supply 100 of the present invention can be adjusted, the voltage regulation range is wide, the linearity is good, the phase is synchronized with the commercial power, the output voltage is isolated from the commercial power (by setting the transformer 140 as an isolation transformer), and the power supply can be supplied. The output frequency of the device 100 is adjusted to a wide range of applications. In addition, the frequency converter 120 is utilized to achieve multiple protections such as overcurrent, overload, overvoltage, output short circuit, etc., thereby providing a longer service life for the adjustable frequency regulated power supply 100.

The above description is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make some improvements and retouching without departing from the inventive structure, and these improvements and retouchings should also be It is regarded as the scope of protection of this creation.

100‧‧‧Power supply

110‧‧‧Three-phase AC grid

120‧‧‧Inverter

130‧‧‧Filter module

140‧‧‧Transformer

150‧‧‧External equipment

211‧‧‧Rectifier unit

212‧‧‧Filter unit

213‧‧‧Inverter unit

214‧‧‧ brake unit

215‧‧‧ drive unit

216‧‧‧Soft start unit

217‧‧‧Microprocessing unit

410‧‧‧Inductance Module

420‧‧‧ Capacitor Module

510‧‧‧ phase control card

1 is a structural block diagram of the power supply of the present invention; FIG. 2 is a block diagram of a frequency converter; FIG. 3 is a circuit connection diagram of an embodiment of the power supply of the present invention; A circuit connection diagram of a preferred embodiment of the power supply of the present invention; Figure 5 is a circuit diagram showing a preferred embodiment of the power supply of the present invention.

100‧‧‧Power supply

110‧‧‧Three-phase AC grid

120‧‧‧Inverter

130‧‧‧Filter module

140‧‧‧Transformer

150‧‧‧External equipment

Claims (7)

A power supply device includes a transformer, the power supply further includes a frequency converter and a filter module; the frequency converter is electrically connected to an external three-phase AC power grid; the frequency converter is electrically connected to the filter module; the filter unit Electrically connected to the transformer; the transformer is electrically connected to an external device. The power supply device of claim 1, wherein the filter module comprises a first inductor, a second inductor, a third inductor, a first capacitor, a second capacitor, and a third capacitor; a first output of the inverter The first electrical connection is electrically connected to the second input end of the transformer through the first inductor and the first capacitor connected in series, and the first output end of the inverter is electrically connected to the first input end of the transformer through the first inductor connected in series; The second output end of the frequency converter is electrically connected to the third input end of the transformer through the second inductor and the second capacitor connected in series, and the second output end of the frequency converter passes through the second inductor connected in series with the second input of the transformer The electrical connection of the terminal; the output end of the frequency converter is electrically connected to the first input end of the transformer through the third inductor and the third capacitor connected in series, and the third output end of the frequency converter passes through the third inductor connected in series with the transformer The third input is electrically connected. The power supply device of claim 1, wherein the power supply further comprises an inductor module and a capacitor module; the transformer is sequentially connected to the external device through the inductor module and the capacitor module. The power supply device of claim 3, wherein the inductor module comprises a fourth inductor, a fifth inductor, and a sixth inductor; the capacitor module includes a fourth capacitor, a fifth capacitor, and a sixth capacitor; The first output is passed through the inductor module The fourth capacitor of the fourth inductor and the capacitor module is grounded, and the first output end of the transformer is electrically connected to the first input end of the external device through the fourth inductor of the inductor module; the second output end of the transformer passes through the inductor module The fifth capacitor of the fifth inductor and the capacitor module is grounded, and the second output end of the transformer is electrically connected to the second input end of the external device through the fifth inductor of the inductor module; the third output end of the transformer passes through the inductor module The sixth capacitor of the sixth inductor and the capacitor module is grounded, and the third output end of the transformer is electrically connected to the third input end of the external device through the sixth inductor of the inductor module; the fourth output end of the transformer is grounded through the ground line . The power supply device of claim 3, wherein the power supply further comprises a phase control card; the phase control card is electrically connected to the three-phase AC power grid, the transformer and the frequency converter, respectively. The power supply device of claim 5, wherein the first output end of the transformer is electrically connected to the first input end of the phase control card via the inductor module and the capacitor module; the second output of the transformer The terminal is electrically connected to the second input end of the phase control card via the inductor module and the capacitor module; the third output end of the transformer is electrically connected to the third input end of the phase control card via the inductor module and the capacitor module The first output end of the three-phase AC power grid is electrically connected to the fourth input end of the phase control card; the second output end of the three-phase AC power grid is electrically connected to the fifth input end of the phase control card; The third output end of the three-phase AC power grid is electrically connected to the sixth input end of the phase control card; the output end of the phase control card is electrically connected to the micro processing unit of the frequency converter through a control signal. The power supply of any one of claims 1 to 6, wherein the frequency converter further comprises a rectifying unit, a filtering unit, an inverting unit, a braking unit, a driving unit and a soft start unit.