KR20130049288A - Apparatus of supplying heated line with direct current - Google Patents

Abstract

PURPOSE: A power supply system of a DC(Direct Current) heat line is provided to solve generation of electromagnetic waves and noise and heating problem fundamentally, by supplying a DC power supply to a DC heating element. CONSTITUTION: According to a heater power supply part, a first power supply part is applied with an AC power source from the external. A first EMI/C filter removes noise of the power supply. A first bridge rectifier outputs a DC power source by receiving the filtered AC power source. A PFC(Power Factor Correction) corrects power factor of the outputted DC power source. A half-bridge resonant converter controller reduces switching loss by comprising an LC resonant circuit. A first DC rectifier rectifies the DC power source whose power factor is corrected by the PFC. A first output sensor is connected to the DC rectifier, and outputs an output voltage and an output current with a reference. According to an auxiliary power supply part, a second power supply part receives the AC power source from the outside. A second EMI/C filter removes noise of the power source. A PWM(Pulse Width Modulation)-IC is connected to the EMI/C filter and controls a current according to duty ratio of the pulse. A second DC rectifier rectifies the inputted DC power source. A controller power source applying part applies a power source to the controller as comparing the output voltage and the output current with a reference. A second output sensor senses a voltage of the AC power source filtered through the EMI/C filter. A VLF(Very Low Frequency) coil receives the outputted AC power source. A controller monitors the output of the second output sensor, and controls supply or blocking of the power source and controls the output voltage, by controlling the half bridge resonant converter controller. A DC heater comprises a DC film heater heating by receiving the DC power source rectified through the first DC rectifier. [Reference numerals] (110) Heater power applying unit; (120) Auxiliary power applying unit; (130) DC heater; (140) Controller; (AA) Power supply system of a DC heat line

Description

Power Supply System for DC Heat Wires {APPARATUS OF SUPPLYING HEATED LINE WITH DIRECT CURRENT}

The present invention relates to a power supply system of a direct current hot wire.

Looking at the Korean residential environment from the past, most buildings have adopted the ondol method of heating the floor by moving high-temperature air flow from the archery along the saddle field.

On the other hand, as the lifestyle has been gradually westernized, the beds have been widely used, and the ondol electric beds, which are similar to the traditional ondol heating structures, have come into the spotlight.

The structure of the ondol type electric bed uses materials such as natural stone or loess soil, but it uses the heating wire to heat the bed surface in the range of 20 ℃ ~ 40 ℃ to inherit the advantages of ondol heating.

Due to these features, the ondol electric bed has attracted considerable attention not only in China, but also in Europe and the United States. Recently, the Ministry of Knowledge Economy's technical standard source is mostly an ondol electric bed such as a stone bed and a soil bed produced by SMEs. Is making every effort to improve export competitiveness and pioneer overseas market by international standardization.

As a result of these efforts, the international standard for on-board electric beds is being adopted by the IEC (International Electrotechnical Commission), which will be reviewed for three years and finally become the international standard.

The standard name of the IEC proposal is "Household and similar electrical appliances-Safety-Part 2: Particular requirements for Ondol-type electric beds with a non-flexible heated part. Requirements for ondol electric beds).

On the other hand, about 300 domestic small and medium-sized companies manufacturing ondol electric beds such as stone beds and earth beds, according to the Ministry of Knowledge Economy (26 October 10), the market size is about 250 billion won.

Looking at the structure of the stone bed and earth bed according to the prior art with reference to Figure 1 by using an AC voltage (220VAC) on both ends of the heating element of the main body to generate heat by using the resistance characteristics against the temperature of the thermistor (Thermister) 20 ℃ ~ 60 Maintain the set temperature up to ℃.

In accordance with the international standard (draft) currently pending, there is a problem that the source of electromagnetic waves harmful to the human body can not be blocked because it controls the temperature using AC power.

Some companies have a filter for shielding electric waves, but it is difficult to completely shield electromagnetic waves, and there is a problem in that manufacturing cost increases.

Document 1. Korean Intellectual Property Office, Patent Application No. 10-2006-68195 "Temperature regulator circuit of heat generating mat" Literature 2. Korean Intellectual Property Office, Patent Application No. 10-2005-45542 "Temperable bed using thermoelectric element" Document 3. Korea Patent Office, Utility Model Registration Application No. 20-2002-1068 "Cold Mat Heat Exchanger

The present invention has been made in order to solve the problems of the prior art as described above is to provide a power supply system of a DC heating wire to fundamentally solve the electromagnetic wave generation problem of the ondol electric bed by supplying DC power to the DC heating element. have.

In particular, switching noise and heat generation problems occur when DC power is supplied to the DC heating element, and matching problems between the control system and the DC power supply line occur. Therefore, the present invention aims to provide a DC heating power supply system that solves these problems. do.

In order to achieve the above object, a power supply system for a DC heating wire according to the present invention includes a first power supply unit receiving AC power from the outside; A first EMI / C filter connected to the first power supply unit to remove noise of power applied from the first power supply unit; A first bridge rectifier for receiving a filtered AC power through the first EMI / C filter and outputting DC power; A power factor correction (PFC) coupled to the first bridge rectifier for correcting a power factor of the DC power output from the first bridge rectifier; A half bridge resonant converter controller connected to the PFC and having a LC resonant circuit to reduce switching loss; A first DC rectifier connected to the PFC and rectifying a DC power source having a power factor corrected by the PFC; And a first output sensor connected to the first DC rectifier and comparing an output voltage and an output current with a reference.

A second power supply unit receiving AC power from the outside; A second EMI / C filter connected to the second power supply unit to remove noise of power applied from the second power supply unit; A second bridge rectifier for receiving the filtered AC power through the EMI / C filter and outputting DC power; A pulse width modulation (PWM) -IC connected to the bridge rectifier for controlling a current according to a duty ratio of a pulse; A second DC rectifier connected to the PWM-IC and one connection point, the second rectifier connected to the bridge rectifier and another connection point, and rectifying an incoming DC power supply; A controller power supply unit connected to the second DC rectifier and comparing output voltage and output current with a reference and supplying power to the controller; And a second output sensor connected to the EMI / C filter and sensing the voltage of the AC power filtered through the EMI / C filter.

The controller is driven by receiving power from the controller power applying unit, and connected to the second output sensor to monitor the output value of the second output sensor, and rectifying through the first DC rectifier by controlling the half bridge resonant converter controller. A controller for controlling the supply or interruption of the power supply and the output voltage; And

And a DC heater having a DC plane heater for generating heat by receiving a DC power rectified through the first DC rectifier.

According to the present invention, there is an effect that the problem of electromagnetic wave generation of the ondol electric bed is fundamentally solved by supplying the DC power to the DC heating element.

In particular, it is possible to improve the stability and user convenience by solving the switching noise and the heat generation problems generated when the DC power supply to the DC heating element.

1 is a reference diagram illustrating a structure of an ondol electric bed according to the prior art,
2 is a conceptual diagram illustrating a connection relationship of a power supply system of a DC heating wire according to the present invention;
3 is a block diagram illustrating a circuit configuration of a heater power supply unit and an auxiliary power supply unit;
4 is a circuit diagram for explaining a circuit configuration of a heater power supply unit and an auxiliary power supply unit;
5 is a block diagram illustrating the circuit configuration of the controller.

Hereinafter, with reference to the preferred embodiments of the present invention and the accompanying drawings will be described in detail the present invention. In order to clarify the present invention, contents which are not related to the configuration of the present invention will be omitted, and the same reference numerals are used for the same components.

On the other hand, when an element is referred to as being "comprising" another element in the description of the invention or in the claims, it is not interpreted as being limited to only that element, Elements may be further included.

Also, in the description of the invention or the claims, the components named as "means", "parts", "modules", "blocks" refer to units that process at least one function or operation, Each of which may be implemented by software or hardware, or a combination thereof.

2 is a conceptual diagram illustrating a connection relationship of a power supply system of a DC heating wire according to the present invention, FIG. 3 is a block diagram illustrating a circuit configuration of a heater power supply unit and an auxiliary power supply unit, and FIG. 4 is a heater power supply unit. And a circuit diagram illustrating the circuit configuration of the auxiliary power supply unit, and FIG. 5 is a block diagram illustrating the circuit configuration of the controller.

As shown in FIG. 2, the power supply system 100 of the DC heating wire according to the present invention includes a heater power supply unit 110, an auxiliary power supply unit 120, a controller 130, and a DC heater 140. Equipped.

The heater power applying unit 110 converts the alternating current input by the control of the controller 130 into a direct current to the DC heater 140, and the auxiliary power applying unit 120 to the controller 130, as described below. Apply power.

The controller 130 controls the amount of heat generated by the DC heater 140 by controlling the voltage applied to each of the DC heaters 140 by a user's manipulation.

In this case, as shown in FIG. 2, a pair of left and right (or more) heater power supply units 110 and a pair of left and right (or more) DC heaters 140 may be provided. Of course, each DC heater 140 receives DC power from the corresponding heater power applying unit 110 to generate heat.

At this time, the controller 130 is connected to each heater power supply unit 110 of a pair of left and right (or more) to adjust the supply or cutoff of the power output to each DC heater 140, the output voltage.

Hereinafter, it will be described on the assumption that each of the heater power supply unit 110 and the DC heater 140 is provided.

According to the block diagram shown in FIG. 3 and the circuit diagram shown in FIG. 4, the heater power applying unit 110 includes a first power supply 111, a first Electro Magnetic Interference (EMI) / C filter 112, and a first filter. A first bridge rectifier 113, a power factor correction (PFC) 114, a half bridge resonant converter controller 115, a first DC rectifier 116, and a first output sensor 117 are provided.

The first power supply 111 receives AC power from an external feeder. Preferably, an AC voltage of 110 to 220 VAC for home may be applied.

Meanwhile, the first EMI / C filter 112 is connected to the first power supply 111 to remove noise of AC current applied through the first power supply 111.

On the other hand, the first bridge rectifier 113 is an alternating current applied to the first power supply 111 as shown in Figs. Current is applied, and a DC current is output at another pair of opposite connection points.

Meanwhile, the power factor of the DC current output through the first bridge rectifier 113 is corrected by a power factor correction (PFC) 114.

The first bridge rectifier 113 preferably uses a smoothing capacitor having a large capacitance value in order to reduce the instantaneous power failure response or the ripple of the input power supply to reduce the switching element burden in the rectifier circuit. As the amount increases, excessive peak current flows discontinuously into the primary DC power supply. Peak current distorts the current and causes harmonic content of the current, which lowers the power factor.

The PFC 114 is provided in consideration of the load characteristics and the power distribution system of the first bridge rectifier 113 to correct the power factor by making a current in-phase.

Meanwhile, as shown in FIG. 3, one contact point of the PFC 114 is connected to the ground and the other one contact point is connected to the first DC rectifier 116.

Meanwhile, a half bridge resonant converter controller 115 is further provided in a path connected from the PFC 114 to the first DC rectifier 116.

The half bridge resonant converter controller 115 reduces switching losses by providing an LC resonant circuit.

The half-bridge resonant converter controller 115, which is the most important element of the heater power applying unit 110, uses the resonant tank as part of the power conversion process, and the active power formed by the power switch is a half bridge. Are applied to the resonant tank circuit. The resulting current is connected to the load through a rectifying system that produces an isolated transformer and a DC current output.

One connection point of the first DC rectifier 116 is connected to the PFC 114, and the other connection point is connected to an output terminal of the half bridge resonant converter controller 115.

As the first DC rectifier 116, a silicon diode or a thyristor may be used.

Meanwhile, a DC current output through the first DC rectifier 116 is applied to the DC heater 140. Prior to this, the first output sensor 117 is connected to the first DC rectifier 116 to output an output voltage and an output. Compare the current with the reference.

As shown in FIG. 3, the auxiliary power supply unit 120 includes a second power supply 121, a second EMI / C filter 122, a pulse width modulation (PWM) -IC 123, and a second DC. A rectifier 124, a controller power supply 125, and a second output sensor 126 are provided.

The second power supply 121 receives AC power from an external feeder. Preferably, an AC voltage of 110 to 220 VAC for home may be applied.

Meanwhile, the second EMI / C filter 122 is connected to the second power supply 111 to remove noise of AC current applied through the second power supply 121.

The output terminal of the second EMI / C filter 122 is connected to the second DC rectifier 124 and the pulse width modulation (PWM-IC) 123, respectively, as shown in FIGS. 3 and 4.

PWM (Pulse Width Modulation) -IC (123) is connected to the second bridge rectifier 113, but controls the current according to the duty ratio of the pulse (Duty Ratio).

The PWM-IC 123 enables easy current control, as well as unnecessary waste of power and heat generation during the control process.

The second DC rectifier 124 is connected to the output terminal of the second EMI / C filter 122 and the output terminal of the PWM-IC 123, respectively, and rectifies the incoming DC power.

On the other hand, the controller power supply unit 125 is connected to the second DC rectifier 124, and compares the output voltage and output current with the reference and applies power to the controller.

On the other hand, the second output sensor 126 is connected in parallel to the output terminal of the EMI / C filter 122, respectively, and detects the voltage of the noise-filtered AC power.

The AC power output through the second output sensor is applied to a VLF (Very Low Frequency) coil 127. Very low frequency (VLF) coil 127 generates an ultra-long wave.

As shown in FIG. 3, the controller 130 is driven by receiving power from the controller power applying unit 125.

Meanwhile, an output terminal of the second output sensor 126 is connected to an input terminal and monitors an output value of the second output sensor 126.

5 illustrates the structure and connection relation of the controller 130 in more detail. As shown in FIG. 5, the controller 130 may include a micro control unit (MCU) 131 and a liquid crystal display (LCD). 133, and further includes an analog input port 132 (not shown).

The DC voltage output through the first output sensor 117 is applied to the analog input port 132, and the analog input port 132 is connected to an analog to digital converter (ADC) channel of the MCU.

Meanwhile, the MCU 131 digitizes a voltage input through an ADC (AD Converter), and then obtains an average value by sampling the same.

Meanwhile, the MCU 131 includes a look up table having a temperature value calculated in advance with respect to an input voltage, and withdraws a corresponding temperature value using the obtained average value from the lock-up table.

When the temperature value is extracted in this way, it is displayed on the LCD 133. In this case, the LCD 133 may be replaced by an equivalent of an LED or a plasma display as a means for displaying a graphic or text.

In addition, the MUC 131 monitors whether the DC heater 140 and the VLF coil 127 operate normally. As the DC voltage output through the first output sensor 117 is applied, the MCU 131 is applied to the DC heater 140 by the heater power applying unit 110 according to the ADC channel input value. Monitor for normal supply.

On the other hand, as the AC voltage output through the second output sensor is applied to the analog input port 132, the MCU 131 is whether the AC current is normally supplied to the VLF coil 127 in accordance with the ADC channel input value. Monitor it.

When an error occurs, it can be displayed through the LCD 133.

On the other hand, the MCU 131 controls the half-bridge resonant converter controller 115 to adjust the supply or interruption of the power rectified through the first DC rectifier 116, the output voltage.

The DC heater 140 includes a DC plane heater 141 that generates heat by receiving a DC power rectified through the first DC rectifier 116.

At this time, the temperature sensor 142 for measuring the heat generated by the DC surface heating element 141 may be further provided, the temperature sensor 142 may be connected to the MCU (131).

The DC plane heater 141 has a characteristic of not generating electromagnetic waves.

The heater power supply unit 110 and the auxiliary power supply unit 120 having the configuration described above include over-voltage protection (OVP), overload protection (OLP), over-current protection (OCP), and abnormal over-voltage protection ( AOCP) and Internal Thermal Protection (TSD).

Such a function may be provided by the MCU 131 monitoring the first output sensor 117 and the second output sensor 126, and some may be processed through the PFC 114 or the PWM 123.

While the present invention has been described with reference to the accompanying drawings and embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. . Accordingly, the scope of the present invention should be determined only by the technical idea of the appended claims, and is not limited to the above embodiments.

The present invention can be applied to the ondol electric bed art and related arts.

110: DC heating wire power supply system
110: heater power supply unit
111: first power supply unit
112: first EMI (Electro Magnetic Interference) / C filter
113: first bridge rectifier
114: Power Factor Correction
115: half bridge resonant converter controller
116: first DC rectifier
117: first output sensor
120: auxiliary power supply unit
121: second power supply unit
122: second EMI / C filter
123: Pulse Width Modulation (PWM) -IC
124: second DC rectifier
125: controller power supply
126: second output sensor
127: Very Low Frequency (VLF) Coil
130: controller
131: MCU (Micro Control Unit)
132: analog input port
133: Liquid Crystal Display
140: DC heater
141: DC plane heating element
142: temperature sensor

Claims (6)

A first power supply unit receiving AC power from the outside; A first EMI / C filter connected to the first power supply unit to remove noise of power applied from the first power supply unit; A first bridge rectifier for receiving a filtered AC power through the first EMI / C filter and outputting DC power; A power factor correction (PFC) coupled to the first bridge rectifier for correcting a power factor of the DC power output from the first bridge rectifier; A half bridge resonant converter controller connected to the PFC and having a LC resonant circuit to reduce switching loss; A first DC rectifier connected to the PFC and rectifying a DC power source having a power factor corrected by the PFC; And a first output sensor connected to the first DC rectifier and comparing an output voltage and an output current with a reference.
A second power supply unit receiving AC power from the outside; A second EMI / C filter connected to the second power supply unit to remove noise of power applied from the second power supply unit; A pulse width modulation (PWM) -IC connected to the EMI / C filter and controlling a current according to a duty ratio of a pulse; A second DC rectifier connected to the PWM-IC and one connection point, the second DC rectifier connected to the EMI / C filter and another connection point to rectify the DC power; A controller power supply unit connected to the second DC rectifier and comparing output voltage and output current with a reference and supplying power to the controller; And a second output sensor connected to the EMI / C filter and sensing the voltage of the AC power filtered through the EMI / C filter. An auxiliary power applying unit having a VLF (Very Low Frequency) coil for generating ultra-long wave by receiving AC power output through the second output sensor;
The controller is driven by receiving power from the controller power applying unit, and connected to the second output sensor to monitor the output value of the second output sensor, and rectifying through the first DC rectifier by controlling the half bridge resonant converter controller. A controller for controlling the supply or interruption of the power supply and the output voltage; And
DC heater comprising: a DC heater having a DC plane heating element for generating heat generated by receiving the DC power rectified through the first DC rectifier. The method of claim 1,
The controller has a micro control unit (MCU) for operation and an analog input port for receiving an analog signal,
DC voltage output through the first output sensor is applied to the analog input port, the analog input port is connected to the ADC (Analog to Digital Converter) channel of the MCU,
The MCU is a DC heating power supply system characterized in that to obtain a mean value after sampling the digitized value through the ADC. The method of claim 2,
The controller has an LCD for graphic or text display,
The MCU has a look up table having a temperature value calculated in advance for an input voltage, and the corresponding temperature value is extracted from the lock-up table and displayed on the LCD. DC heating wire power supply system. The method of claim 3, wherein
As the DC voltage output through the first output sensor is applied to the analog input port of the MCU, the MCU determines whether the DC current is normally supplied to the DC heater by the heater power applying unit according to the ADC channel input value. Monitoring,
As the AC voltage output through the second output sensor is applied to the analog input port of the MCU, the MCU monitors whether an AC current is normally supplied to the VLF coil according to an ADC channel input value.
DC power supply system, characterized in that the error display through the LCD when not supplied normally. The method of claim 1, wherein
The heater power supply unit 110 and the auxiliary power supply unit 120 includes Over-Voltage Protection (OVP), Overload Protection (OLP), Over-Current Protection (OCP), Abnormal Over-Voltage Protection (AOCP), and Internal. A DC heating system power supply system characterized by providing one or more functions of Thermal Protection (TSD). The method of claim 1,
And a pair of left and right heater power supply units and a pair of left and right DC heaters, each DC heater generates heat by receiving DC power from a corresponding heater power supply unit, and the controller is a pair of left and right heater power supplies. And a power supply system for controlling a half bridge resonant converter controller to supply or cut power to and output power from each DC heater.

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