Hybrid power supply for smart film

Abstract

The present invention relates to a power supply device that diversifies the input voltage while simultaneously enabling the output to be an AC voltage having a non-sinusoidal waveform, thereby enabling the effect of reducing power consumption and limiting heat generation relative to the same transmittance in a smart film to be connected. The invention is characterized by comprising: an input unit including at least one of an AC processing unit that converts an AC voltage applied to an input port into a DC voltage and supplies it to a common bus, and a DC processing unit that supplies a DC voltage applied to an input port to a common bus; an inverter that converts a DC voltage input through a common bus into an AC voltage and outputs it to be supplied to a smart film connected by wiring; a control unit that checks the operating status of the inverter, including internal temperature and output voltage, through sensor measurements, and controls one or more of the inverter's frequency, duty cycle, or RMS value to vary based on the confirmed measurements; and an adjustment unit that cuts off the output of the inverter when the internal temperature included in the measurements is above a predetermined upper limit setting temperature and resumes the output when it is below a predetermined lower limit setting temperature.

Description

Technology Field

[0001] The present invention relates to a hybrid power supply device for smart films, and more specifically, to a power supply device that diversifies the input voltage while simultaneously enabling the output to be an AC voltage having a non-sinusoidal waveform, thereby enabling the effect of reducing power consumption and limiting heat generation relative to the same transmittance in a smart film to be connected. Background Technology

[0003] Generally, smart films have the characteristic of changing light transmittance depending on whether power is applied, so they are applied and used in various items such as windows of buildings and sunroofs of vehicles.

[0004] To use such smart films, a power supply unit is required to supply power, and it must be equipped with an inverter that rectifies AC power, converts it into DC voltage, and then converts it back into AC voltage.

[0005] At this time, as with the invention of Korean Registered Patent Publication No. 10-1873822, most power supply devices for smart films utilize an inverter that converts a DC voltage into an AC voltage with a sinusoidal wave.

[0006] In other words, the above-mentioned sinusoidal inverter is used to ensure compatibility with the existing power grid and to suppress electromagnetic interference, but since the internal circuit configuration for this must be complex, problems of increased power consumption and heat generation inevitably arise.

[0007] Therefore, as various problems arise, such as reduced efficiency of the power supply and increased manufacturing costs, it can be said that an alternative solution is needed to resolve this problem.

[0008] In addition, since existing products are designed to limit the input voltage to AC voltage, a problem arises where they cannot be used in environments using DC power, that is, where they cannot be used overseas, so it can be said that a solution to this problem is also necessary. Prior art literature

[0010] Korean Patent Publication No. 10-1873822 (June 27, 2018) The problem to be solved

[0011] The present invention is an invention proposed for the purpose of solving the above-mentioned problems,

[0012] Existing products are designed to limit the input voltage to AC voltage, which causes a problem in that they cannot be used in environments using DC power, and

[0013] Because the internal inverter is configured to convert DC voltage into AC voltage with a sinusoidal wave Since the problem of increased power consumption and heat generation of smart films occurs despite maintaining the same transmittance, the purpose is to present a solution to these problems. means of solving the problem

[0015] The present invention aims to realize the above-mentioned objectives,

[0016] A hybrid power supply device for a smart film is presented, characterized by comprising: an input unit including one or more of an AC processing unit that converts an AC voltage applied to an input port into a DC voltage and supplies it to a common bus, and a DC processing unit that supplies a DC voltage applied to an input port to a common bus; an inverter that converts the DC voltage input through the common bus into an AC voltage and outputs it to be supplied to a smart film connected by wiring; a control unit that checks the operating state of the inverter, including internal temperature and output voltage, through a sensor measurement value, and controls one or more of the inverter's frequency, duty ratio, or RMS value to vary based on the confirmed measurement value; and an adjustment unit that cuts off the output of the inverter when the internal temperature included in the measurement value is above a predetermined upper limit setting temperature, and resumes the output when it is below a predetermined lower limit setting temperature.

[0017] At this time, the AC processing unit is configured to include a Power Factor Correction (PFC) circuit, characterized in that the power factor is maintained at 0.9 or higher.

[0018] In addition, the above-mentioned DC processing unit is characterized by being configured to include a reverse polarity protection circuit and a reverse current prevention circuit for the purpose of preventing damage to the component due to the connection of opposite polarity of the power supply or reverse current flow.

[0019] In addition, the inverter is configured to include a bridge comprising a plurality of switching elements and a gate driver controlling the switching elements, and is characterized by being configured to convert an input DC voltage into a non-sinusoidal wave having one of a square wave, a trapezoidal wave, or a PWM wave, while having a variable frequency or duty ratio.

[0020] And it is characterized by being configured so that the discharge current on the output side of the above inverter returns to the common bus through the current recovery unit (230). Effects of the invention

[0022] The hybrid power supply for smart films according to the present invention is,

[0023] With a configuration having an AC processing unit and a DC processing unit inside, the effect of enabling use when not only AC voltage but also DC voltage is applied occurs.

[0024] In addition, since the inverter is configured to convert DC voltage into AC voltage with a non-sinusoidal waveform, it results in a reduction in both power consumption and heat generation in the connected smart film compared to the same transmittance.

[0025] In addition, the AC processing unit is configured to be equipped with a power factor correction circuit, the DC processing unit is configured to be equipped with a reverse polarity protection circuit and a reverse current prevention circuit, and the inverter is configured to be equipped with a recovery path that allows the discharge current from the output side to return to the common bus, thereby providing the effect of resolving problems such as power loss, increased load, heat generation, and reduced lifespan. Brief explanation of the drawing

[0027] FIG. 1 is a basic configuration diagram of a hybrid power supply for smart film according to the present invention. FIG. 2a is a configuration diagram with a single input port. FIG. 2b is a configuration diagram with a separate input port. FIG. 3 is a configuration diagram showing a state in which a power factor correction circuit is provided in an AC processing unit constituting the input unit of the present invention. FIG. 4 is a configuration diagram showing a state in which a reverse polarity protection circuit and a reverse current prevention circuit are provided in the DC processing unit constituting the input unit of the present invention. FIG. 5 is a configuration diagram showing some components of an inverter constituting the present invention. FIG. 6a is a configuration diagram showing a state in which a current recovery unit is provided together with the inverter. FIG. 6b is a configuration diagram showing a multi-channel structure equipped with multiple inverters. FIG. 7 is a flowchart showing the process of a control unit constituting the present invention controlling an inverter. FIG. 8 is a flowchart showing the process of a control unit constituting the present invention controlling the output of an inverter. Specific details for implementing the invention

[0028] The present invention relates to a hybrid power supply device for smart films, and,

[0029] The device is characterized by comprising: an input unit (100) including at least one of an AC processing unit (110) that converts an AC voltage applied to an input port into a DC voltage and supplies it to a common bus (B), and a DC processing unit (120) that supplies a DC voltage applied to an input port to a common bus (B); an inverter (200) that converts a DC voltage input through the common bus (B) into an AC voltage and outputs it to be supplied to a smart film connected by wiring; a control unit (300) that checks the operating state of the inverter (200), including an internal temperature and an output voltage, through a sensor measurement value, and controls one or more of the frequency, duty ratio, or RMS value of the inverter (200) to vary based on the confirmed measurement value; and an adjustment unit (400) that cuts off the output of the inverter (200) when the internal temperature included in the measurement value is above a predetermined upper limit setting temperature, and resumes the output when it is below a predetermined lower limit setting temperature.

[0031] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings.

[0032] First, as illustrated in FIG. 1, the input unit (100) is a device to which an external power source is applied, and is configured to include one or more of an AC processing unit (110) corresponding to an AC power source and a DC processing unit (120) corresponding to a DC power source.

[0033] That is, the input unit (100) may be configured to include an AC processing unit (110) connected to a single input port, and likewise may be configured to include a DC processing unit (120) connected to a single input port.

[0034] In addition, as shown in FIGS. 2a and 2b, the input unit (100) may be configured to include an AC processing unit (110) and a DC processing unit (120) connected to a single input port or connected to different input ports one by one, thereby enabling the use of the power supply device regardless of the form of the supply voltage.

[0035] More specifically, the AC processing unit (110) is a device connected to an input port in response to an AC power source, and plays the role of converting the AC voltage applied to the input port into a DC voltage and supplying it to a common bus (B).

[0036] That is, the AC processing unit (110) is configured to have a rectifier and a smoothing circuit, so that an AC voltage in the range of 110 to 220V input to an input port is first rectified and then smoothed to be converted into a predetermined DC voltage with pulsation removed.

[0037] In addition, it is configured to further include a first converter for step-down, thereby allowing a DC voltage formed in the range of 155 to 311V to be stepped down to 24V (±5%).

[0038] That is, through rectification by the above rectifier, an AC voltage in the range of 110 to 220 V can be converted into a DC voltage in the range of 155 to 311 V, and then the voltage can be reduced to 24 V (±5%) by step-down by a first converter configured as a DC-DC type.

[0039] Accordingly, a DC voltage stepped down to 24V (±5%) can be applied to a common bus (B) through wiring connected to the rear end of the AC processing unit (110), and can be immediately supplied to an inverter (200) connected to the rear end.

[0040] In addition, the DC processing unit (120) is a device connected to an input port in correspondence with a DC power source, and has the role of supplying the DC voltage applied to the input port as is to the common bus (B) or supplying it after stepping it down.

[0041] That is, the DC processing unit (120) is configured to include a voltage detection unit, a bypass unit including a relay, and a second converter configured as a DC-DC type, so that the input DC voltage of 24V is output as is, and the DC voltage exceeding 24V is output as a DC voltage of 24V through step-down.

[0042] For example, in the case where a DC voltage of 24V is input through the input port, the voltage can be detected by the voltage detection unit and the relay is activated accordingly. (Example 1)

[0043] And it can be configured so that a bypass path connection occurs upon activation of the relay, and thereby a DC voltage of 24V can be applied to the common bus (B) through wiring connected to the rear end of the DC processing unit (120).

[0044] However, when a DC voltage exceeding 24V is input through the input port, the deactivated state of the relay is maintained, so the DC voltage of 24V, which is supplied to the second converter and stepped down, can be applied to the common bus (B) through the wiring connected to the rear end of the DC processing unit (120).

[0045] However, this is not necessarily the case, and it may be configured in the opposite way so that when a 24V DC voltage is input through the input port, the output is produced as is due to the deactivation of the relay.

[0046] For example, in the case where a DC voltage of 24V is input through the input port, the voltage detection unit may be configured to detect the voltage and maintain the deactivated state of the relay accordingly (Example 2).

[0047] And it can be configured so that the voltage supply as is occurs due to the deactivation of the relay, and thus a DC voltage of 24V can be applied to the common bus (B) through the wiring connected to the rear end of the DC processing unit (120).

[0048] Conversely, in the case where a DC voltage exceeding 24V is input through the input port, the voltage detection unit may be configured to detect the voltage and activate the relay accordingly to supply to the second converter, and thereby the DC voltage stepped down to 24V may be applied to the common bus (B) through the wiring.

[0050] Meanwhile, as illustrated in FIG. 2a, the input unit (100) may be configured to further include a determination unit (130) and a switching unit (140) for the purpose of switching the supply path according to the type of input voltage, in the case where the power supply device according to the present invention is configured to have a single input port.

[0051] That is, it may be configured to include a determination unit (130) that distinguishes between AC and DC by detecting one or more of the zero crossing of the waveform, the presence or absence of frequency, the magnitude of the DC component, or the ripple rate for a voltage applied to a single input port, and a switching unit (140) that maintains or switches the supply path according to the result of the determination by the determination unit (130).

[0052] And it may be configured to include a power cutoff unit (150) that simultaneously cuts off the connection between the input port and the AC processing unit (110) and between the input port and the DC processing unit (120) until the judgment by the judgment unit (130) is completed.

[0053] At this time, the method by which the power cutoff unit (150) cuts off the connection may use a mechanical relay, a contactless switch, or an electronic switch.

[0054] Accordingly, it may be possible to maintain or switch the supply path so that the AC voltage supplied through a single input port is supplied to the AC processing unit (110) and the DC voltage is supplied to the DC processing unit (120), and in the process, damage to the circuit due to incorrect voltage application may be prevented.

[0055] In addition, as shown in FIG. 3, the AC processing unit (110) may be configured to include a power factor correction (PFC) circuit (111) configured to include an inductor and a switching element for the purpose of maintaining a power factor of 0.9 or higher.

[0056] That is, when the current input to the rectifier flows in the form of pulses during the process of rectifying the AC power, the harmonic components increase due to distortion of the current waveform, and thus problems of unnecessary power loss and increased load occur, so a power factor correction circuit (111) can be provided to solve this problem.

[0057] Therefore, distortion of the current waveform input to the rectifier can be prevented or minimized, and as a result, the power factor can be maintained at 0.9 or higher, thereby increasing power efficiency.

[0058] Additionally, as shown in FIG. 4, the DC processing unit (120) may be configured to include a reverse polarity protection circuit (121) and a reverse current prevention circuit (122) for the purpose of preventing damage to the component due to the connection of opposite polarity of the power supply or reverse current flow.

[0059] That is, for the purpose of preventing internal circuit damage when the polarity is reversed during the process of connecting the DC power supply, a reverse polarity protection circuit (121) composed of a diode or MOSFET can be provided on the input port side to provide protection by blocking or bypassing the current.

[0060] In addition, for the purpose of preventing the occurrence of a problem in which current flows backward from the common bus (B) while an AC voltage is applied, a reverse current prevention circuit (122) composed of a diode or a MOSFET may be installed on the common bus (B) side.

[0061] Therefore, backflow to the DC processing unit (120) can be prevented, and the effect of protecting the internal circuit and preventing heat generation and power loss caused by unnecessary circulating current occurs.

[0063] In addition, the inverter (200) is a device that converts direct current into alternating current, and plays the role of converting a 24V direct current voltage input through the common bus (B) into an alternating current voltage and outputting it externally.

[0064] That is, the 24V DC voltage output from the AC processing unit (110) and the 24V DC voltage output from the DC processing unit (120) can be supplied to the inverter (200), where they are converted into AC voltage, then passed through a filter and output to the smart film connected by wiring.

[0065] At this time, the inverter (200) is characterized by being configured to convert the input DC voltage into a non-sinusoidal wave having a square wave, a trapezoidal wave, or a PWM wave, and simultaneously having a variable frequency or duty ratio, and output it.

[0066] That is, as illustrated in FIG. 5, the inverter (200) is configured to include a bridge (210) comprising a plurality of switching elements and a gate driver (220) that controls the switching elements by periodically turning them on and off, so as to be configured to convert an input DC voltage into a non-sinusoidal wave such as a square wave, a trapezoidal wave, or a PWM wave.

[0067] In this process, the gate driver (220) can control the frequency or duty cycle of the output waveform by variably controlling the switching frequency or duty cycle while simultaneously generating the waveform, thereby reducing power consumption and limiting heat generation relative to the same transmittance of the smart film.

[0068] Of course, the inverter (200) may be configured to output a symmetric AC waveform including a sine wave as needed, and in this case, the driving stability of the smart film can also be ensured.

[0069] In addition, the gate driver (220) is characterized by correcting the dead time of the internal switching elements provided in the bridge (210) so that the DC offset of the output waveform is maintained at 1% or less of the effective voltage.

[0070] In other words, if the DC offset of the output waveform deviates from 2% of the effective voltage, the output waveform becomes unbalanced, resulting in the generation of a DC component. Consequently, an unnecessary DC voltage is applied to the smart film to which an AC voltage is required, causing problems such as heat generation and reduced lifespan.

[0071] Therefore, the gate driver (220) can precisely control the on / off timing of the switching element to ensure that the dead time is maintained uniformly, thereby preventing the occurrence of the above problem.

[0072] At this time, even when the DC offset of the output waveform is controlled to 2% or less, heat generation or performance degradation due to accumulated DC components may still occur during long-term operation, so in order to secure more stable and long-term driving characteristics, the DC offset of the output waveform is maintained at 1% or less of the effective voltage.

[0073] Additionally, as shown in FIG. 6a, the discharge current on the output side of the inverter (200) can be configured to return to the common bus (B) through a current recovery unit (230) including a diode or MOSFET, thereby reducing energy loss while simultaneously improving efficiency and heat generation characteristics.

[0074] Meanwhile, as shown in FIG. 6b, one inverter (200) may be provided, but It can be configured in the form of a multi-channel structure in which each channel is independently controlled using an opening / closing switch (S) involved in connection with a common bus (B).

[0075] That is, the above power supply can be used to control only one smart film, but it can be configured to control multiple smart films simultaneously or individually, and can be provided with multiple inverter channels for this purpose.

[0076] At this time, a method of turning on / off a switching element provided for each channel may be used as a method for simultaneous or individual control, and a control circuit for this purpose may be additionally provided.

[0078] In addition, the control unit (300) is a device for controlling the inverter (200), and controls the inverter (200) by using a sensor measurement value that is periodically sampled to make one or more of the frequency, duty ratio, or RMS value of the inverter (200) variable.

[0079] That is, as illustrated in FIG. 7, the control unit (300) periodically checks the operating state of the inverter (200), including the internal temperature and output voltage, through the measurement value of the sensor, and based on the confirmed measurement value, causes one or more of the frequency, duty ratio, or RMS value of the inverter (200) to be varied.

[0080] At this time, it is preferable that the frequency be varied in the range of 50 to 1000 Hz and the effective voltage be varied in the range of 40 to 120 V_RMS, and the duty cycle can be arbitrarily adjusted according to the driving conditions.

[0081] To this end, the inverter (200) must be equipped with a temperature sensor that measures the temperature of its internal circuit in real time and a voltage sensor that measures the output voltage, and may also be equipped with a current sensor that measures the output current as needed.

[0082] Accordingly, the temperature and output voltage of the internal circuit of the inverter (200), and furthermore, the output current, can be periodically checked, and one or more of the frequency, duty ratio, or RMS value of the inverter (200) can be changed through control accordingly.

[0083] That is, the inverter (200) can be configured to be controlled by checking the temperature rise rate of the internal circuit and adjusting the frequency corresponding to the rise rate according to a reference table or correction algorithm, and checking the fluctuation rate of the output voltage and adjusting the duty ratio and / or RMS value corresponding to it according to a reference table or correction algorithm.

[0084] As a result, the power consumption of the smart film can be reduced even while maintaining the same transmittance, and at the same time, the problem of deterioration or damage caused by overheating of the inverter (200) can be resolved.

[0085] Additionally, the control unit (300) may be configured to correct in a closed-loop manner so that the RMS value calculated based on real-time sampling of the output voltage or current is maintained within a preset target range, and may be configured to offset the DC offset component by comparing the integral value of the output waveform for each half-cycle.

[0086] That is, the control unit (300) can sample the voltage or current of the output terminal in real time and correct the RMS value calculated using this so that it falls within a preset target range, thereby ensuring that the voltage or current of the output terminal is always maintained stably.

[0087] Therefore, since unnecessary power consumption and heat generation are suppressed, the durability of the smart film can be improved.

[0088] In addition, DC offset (DC component) caused by waveform imbalance can be detected by comparing the integral values ​​of the output waveform for each half-cycle, and the symmetry and stability of the waveform can be ensured by removing the detected DC component through cancellation control.

[0089] Therefore, since discoloration or deterioration of the smart film can be prevented, the lifespan of the product is improved in this respect as well.

[0090] In addition, the control unit (300) may be configured to automatically identify a stable operating frequency that enables optimal operation by sequentially testing a plurality of candidate frequencies during initial operation, and the identified stable operating frequency may be used as a default value from the next operation to optimize the transmittance characteristics and power efficiency of the smart film.

[0091] Therefore, automatic optimization becomes possible even if changes occur in the usage environment or the characteristics of the input power.

[0092] In addition, the control unit (300) can disperse and reduce the peak value of electromagnetic interference by using a spread-spectrum technique that randomly modulates the period of the switching clock applied to the gate driver (220) every cycle so that the switching frequency fluctuates irregularly within a range of ±2%.

[0093] That is, the control unit (300) can use a random number generator or a random number algorithm in the process of controlling the signal period of the switching clock applied to the gate driver (220) so that the clock period fluctuates slightly within the range of ±2% every cycle.

[0094] Therefore, since the switching frequency is not fixed to a constant value but varies irregularly within a range of ±2%, energy is not concentrated on specific frequency components but is dispersed over a wide frequency band.

[0095] As a result, the peak value of electromagnetic interference is reduced, so the electromagnetic compatibility characteristics of the power supply can be improved accordingly.

[0097] In addition, the above adjustment unit (400) is a device involved in the output of the inverter (200) and performs output control based on the internal temperature confirmed through the measurement value of the sensor.

[0098] That is, the control unit (400) controls the output by cutting off the output of the inverter (200) when the internal temperature of the inverter (200), which is included in the measurement value of the sensor checked periodically, is above a predetermined upper limit setting temperature, and resuming the output when it is below a predetermined lower limit setting temperature.

[0099] For example, as illustrated in FIG. 8, the adjustment unit (400) can cut off the output of the inverter (200) when the temperature of the internal circuit, measured by a temperature sensor, is confirmed to be 50 (±3)°C or higher, which is the upper limit set temperature.

[0100] In addition, when the temperature of the internal circuit measured by the temperature sensor is confirmed to be 45°C or lower, the output cutoff of the inverter (200) can be released so that the output can be resumed.

[0101] In this way, the above adjustment unit (400) provides a hysteresis section in the output control of the inverter (200) so that a chattering phenomenon in which output restriction and resumption are repeated near a boundary value of a specific set temperature can be prevented.

[0102] In addition, to protect the internal circuit, it is desirable to control the inverter using a soft start method that gradually increases the output voltage. Furthermore, if the output is cut off and resumed more than a preset number of times within a certain period, it is desirable to limit further resumption and switch to a latch-type fault state requiring a power reset by the user.

[0104] As such, the present invention is configured to actively respond to various power environments and to optimize operating conditions suitable for the characteristics of the smart film and the usage environment, thereby ensuring a significant lifespan and stable performance.

[0105] As an example, the present invention can be applied to a PDLC smart film attached to the exterior wall of a commercial office building, and below, an example thereof will be described in detail to aid understanding.

[0106] First, let us assume a situation where a power supply unit is used that can receive both 220V / 60Hz commercial AC power and 24V DC power supplied from the building's emergency power system through a single input port.

[0107] At this time, when an AC voltage of 220V is input, rectification into a DC voltage occurs by the AC processing unit (110), and the power factor is maintained at 0.95 or higher by the power factor correction circuit (111).

[0108] Next, as the voltage is stepped down by the first converter, a DC voltage of 24V is applied to the common bus (B).

[0109] However, in the event that the AC power supply is cut off, a DC voltage of 24V supplied by the building's emergency power system is input, and when the opposite polarity is connected or reverse current occurs, protection of the internal circuit by the reverse polarity protection circuit (121) or reverse current prevention circuit (122) occurs.

[0110] And as the 24V DC power applied to the above common bus (B) is supplied to the inverter (200), an AC voltage having a square wave with an RMS value (RMS) of 65V and a frequency of 100Hz is output to the smart film.

[0111] At this time, the control unit (300) executes an 'optimization mode' during initial operation, sweeps the output frequency from 50Hz to 150Hz in 10Hz increments, and measures the power consumption at each frequency, the transmittance of the film (linked to an external light intensity sensor), and whether audible noise is generated due to fine vibration.

[0112] Next, based on the measured data, the optimal frequency of 100Hz, which achieves the target transmittance with the lowest power consumption and is noise-free, is identified and automatically set as the operating frequency.

[0113] And the control unit (300) compares the integral values ​​of the (+) half-cycle and (-) half-cycle of the output waveform in real time, and if a DC offset is detected due to the difference between the two values, it finely adjusts the dead time of the gate driver (220) so that the offset is canceled out.

[0114] Therefore, since the DC offset can be strictly managed to be 0.5% or less of the effective voltage, the smart film does not discolor or deteriorate despite long-term use.

[0115] In addition, when the internal temperature of the power supply unit rises due to direct sunlight in the summer, the adjustment unit (400) operates to perform output control based on the internal temperature confirmed through the measurement value of the sensor.

[0116] That is, when the temperature inside the power supply unit measured by the temperature sensor reaches the upper limit set temperature of 50℃, the output cutoff by the adjustment unit (400) occurs to prevent further overheating.

[0117] At this time, the smart film becomes opaque and serves to block sunlight entering the interior.

[0118] Afterwards, when the temperature is lowered to the lower limit setting temperature of 45℃, output resumption by the adjustment unit (400) occurs, and in order to reduce the stress applied to the smart film during this process, a soft start method is used to gradually increase the voltage from 0 to 65V.

[0119] In this way, by providing a hysteresis interval of 5°C, it is possible to prevent the chattering phenomenon in which output is repeatedly limited and resumed near the boundary value of a specific set temperature.

[0121] The embodiments described above are provided as examples to ensure that the technical concept of the present invention is sufficiently conveyed to those skilled in the art to which the present invention belongs, and the present invention is not limited to the embodiments described above and may be embodied in other forms.

[0122] To clearly explain the present invention, parts unrelated to the explanation have been omitted from the drawings, and in the drawings, the width, length, thickness, etc. of the components may be exaggerated or reduced for convenience.

[0123] In addition, the same reference numbers throughout the specification represent the same components. Explanation of the symbols

[0125] 100: Input section → 110: AC processing section → 111: Power factor correction circuit → 120 : DC processing unit → 121 : Reverse polarity protection circuit → 122 : Backflow prevention circuit → 130 : Judgment unit → 140 : Switching section → 150 : Power cutoff section 200: Inverter → 210: Bridge → 220 : Gate driver → 230 : Current recovery unit 300 : Control unit 400 : Adjustment unit B: Common bus S: Open / close switch

Claims

Claim 1 An input unit (100) comprising at least one of an AC processing unit (110) that converts an AC voltage applied to an input port into a DC voltage and supplies it to a common bus (B), and a DC processing unit (120) that supplies a DC voltage applied to an input port to a common bus (B); an inverter (200) that converts a DC voltage input through the common bus (B) into an AC voltage and outputs it to be supplied to a smart film connected by wiring; a control unit (300) that checks the operating state of the inverter (200), including an internal temperature and an output voltage, through a sensor measurement value, and controls one or more of the frequency, duty ratio, or RMS value of the inverter (200) to vary based on the confirmed measurement value; and an adjustment unit (400) that cuts off the output of the inverter (200) when the internal temperature included in the measurement value is above a predetermined upper limit setting temperature, and resumes the output when it is below a predetermined lower limit setting temperature. A hybrid power supply device for a smart film, characterized by being configured to include: an input unit (100), wherein the input unit (100) further comprises: a determination unit (130) that determines whether the voltage applied to a single input port is zero-crossing of the waveform, the presence or absence of frequency, the magnitude of the DC component, or the ripple rate, thereby distinguishing between AC and DC; and a switching unit (140) that maintains or switches the supply path so that the AC voltage is supplied to the AC processing unit (110) and the DC voltage is supplied to the DC processing unit (120) according to the result of the determination by the determination unit (130). Claim 2 delete Claim 3 A hybrid power supply for smart film according to claim 1, wherein the AC processing unit (110) is configured to include a power factor correction (PFC) circuit (111) to maintain a power factor of 0.9 or higher. Claim 4 A hybrid power supply for smart film according to claim 1, wherein the DC processing unit (120) is configured to include a reverse polarity protection circuit (121) and a reverse current prevention circuit (122) for the purpose of preventing damage to the device due to the connection of opposite polarity of the power supply or reverse current flow. Claim 5 A hybrid power supply for smart film according to claim 1, wherein the inverter (200) is configured to include a bridge (210) comprising a plurality of switching elements and a gate driver (220) for controlling the switching elements, and is configured to convert an input DC voltage into a non-sinusoidal wave having one of a square wave, a trapezoidal wave, or a PWM wave, while having a variable frequency or duty ratio. Claim 6 A hybrid power supply for smart film according to claim 1 or 5, wherein the inverter (200) is characterized in that the DC offset of the output waveform is maintained at 1% or less of the effective voltage by a method in which the gate driver (220) corrects the dead time of an internal switching element provided in a plurality of units in the bridge (210). Claim 7 A hybrid power supply for smart film, characterized in that, in claim 1 or 5, the discharge current on the output side of the inverter (200) is configured to return to the common bus (B) through the current recovery unit (230). Claim 8 A hybrid power supply for smart film according to claim 1 or 5, wherein the inverter (200) is independently controlled for each channel using an opening / closing switch (S) that is involved in connecting to a common bus (B) in a state configured with a multi-channel structure. Claim 9 A hybrid power supply for smart film according to claim 1, wherein the control unit (300) is configured to correct in a closed-loop manner so that the RMS value calculated based on real-time sampling of the output voltage or current is maintained within a preset target range, offset the DC offset component through comparison of integral values ​​for each half-cycle of the output waveform, and automatically set the confirmed stable operating frequency as the default value by sequentially testing a plurality of candidate frequencies during initial operation. Claim 10 A hybrid power supply for a smart film according to claim 1, wherein the control unit (300) randomly modulates the period of the switching clock applied to the gate driver (220) every cycle to disperse and reduce the peak value of electromagnetic interference using a spread-spectrum technique that causes the switching frequency to fluctuate irregularly within a range of ±2%.

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