TW200903947A - Multi-mode power supply system and its control method - Google Patents

Abstract

A multi-mode power supply system and its control method are disclosed. It includes a photovoltaic module served as a main source for power supply. That has an AC power connected to an AC to DC power converter as a backup power source and with a control circuit receives signals from a maximum power point tracking device and a battery device to control a DC to DC boost converter device. A first switch device, a second switch device and a third switch device are controlled by the control circuit to avoid overcharging or over-discharging of the battery device. As one of the photovoltaic module and the AC power and the battery device is chosen by the control circuit to provide power for a load device.

Description

200903947 IX. Description of the invention: [Technical field to which the invention pertains] The present invention relates to a multi-mode supply and lightning supply & s, 、, 糸, first, and especially related to LED parent slogan Multi-mode power supply system. [Prior Art] Traffic signs are currently indispensable for maintaining traffic safety.

At present, the traffic signs and systems are powered by power companies, such as Taipower.: Early-power supply mode. Therefore, once a natural disaster or human cause occurs, the cause of the power failure is that the road traffic in each area will be completely lost. It poses a serious traffic safety threat. & The traditional traffic light system uses a special incandescent lamp as the light source. The lamp used is a general tungsten wire bulb. Its life is short, it often fails, and the maintenance is too high, although it is cheap, but it is cheap. The shortcoming is short life and large power consumption. Before the incandescent tungsten light bulb is broken, its brightness will gradually decrease due to the deposition of tungsten atoms evaporated on the filament inside the glass, so its life and energy consumption are gradually inconsistent. Energy efficiency. Light Emitting Diode (LED) traffic light has a long life (usually about 8~1 years) and low power consumption (about 15w). At this stage, some counties and cities in Taiwan have begun. Set the LED traffic number, but there is no LED traffic sign that is powered by solar energy. Generally, the power output from the solar panel is mostly charged in the way of charging the battery to store power. The voltage and motor characteristics of the solar panel are greatly affected by temperature and illuminance. The rate of power storage is very high at a constant current of 200,903,947. Therefore, it must be based on the power generated by the solar panel to match the load to achieve maximum. Power output. Common methods are power feedback method and linear approximation method are complex, point, so the process in the implementation is more difficult - the method has a carrier - the accumulation - the actual analog hardware circuit is complicated and hard Body circuit product. The low elasticity is 'high cost' and is not suitable for general commercialization. [Invention] The object of the present invention is to provide a multi-mode power supply system, which is composed of solar power, mains power and storage. The device is equipped with a hybrid power supply system to improve the greed for power supply to the load, 拽A m 〇„, and the element is used for the pendulum. In addition, to avoid the load stoppage caused by the power failure during the first power supply is to provide a multi-mode power supply system, by the city == (four), the maximum power tracking disturbance control method to control the electricity, can be pinched r: power supply control In order to maximize the power of the power storage device to maximize the benefits of solar modules. =: Ming multi-mode power supply system, including a power supply circuit, - control circuit - first switching device and - load device " power supply device includes a solar module and a mains power supply. Main power = connected: between the power supply device and the first switching device, and includes a second switching device, a boost converter: a circuit: a third switching device and a power storage device. The control circuit contains a microcomputer control unit. 200903947 The solar module is used to convert the received solar energy into electrical energy, which is a source of main power, and the voltage is boosted by the boost converter to charge the power storage device and provide the load device. power supply. The maximum power tracking device is coupled to the solar module and includes a voltage sensor and a current sensor for extracting an output voltage signal and an output current signal of the solar module. The microcomputer control device receives the two apostrophes' and calculates the power to determine the pulse width modulation control signal to be sent to the transistor switch of the boost converter device. The second switching device is connected between the maximum power tracking device and the boost converter device, and acts as a control switch to determine the operation of the second switching device via the microcomputer control device. When the solar module is unable to supply power and the power storage device is discharged, (4) the power source is used as a backup power source, and the power conversion device is connected to the power conversion device to convert the IL power source into a DC power source to charge the power storage device. And the power required to provide the load device. The power storage device includes a voltage page for taking the voltage level of the power storage device. The third switching device is connected between the power storage device and the power conversion device as a control switch, and is controlled by the microcomputer to determine the operation of the second switching device to control the power supply to be added to And the load device passes through the first switching device as a control switch to determine the first and the table operation via the microcomputer control device to control the power storage device to timely cut off the LED traffic control device. . 200903947 A multi-mode system according to the present invention comprises: ^,. Charge control method 'This control (a): reset system, guide flute, ^ f, guide, brother-switching device and second switching device, close The third switching device. , clothing (1): debt test a solar module • terminal voltage; | electric device judgment when the output voltage of the solar module is greater than n 〇 = (four) the terminal voltage of the livestock device is less than - the second preset value, then enter a mode A, otherwise, enters a mode B, wherein the mode is connected to the first switching device and the second switching device, and the third switching device is turned off, so that the boosting module charges the f electrical device via the boosting (four) Providing negative power of the device, the mode B is to turn off the second switching device and the third switching device is to turn on the first switching device. When the power storage device separately provides the load device in the mode A, the wheel of the solar module is continuously detected. And outputting the voltage of the end of the electric device, and when the output voltage of the solar module is greater than the first preset value and the voltage of the terminal of the power storage device is less than the second preset value, the mode A is continued. Otherwise, enter the mode B; (e): in the mode B, 'continue to detect the terminal voltage of the power storage device, when the terminal voltage of the power storage device is greater than a third preset value, continue to perform the mode B, Otherwise enter - mode c, where The mode c turns on the first switching device and the third switching device, turns off the second switching device, and charges the power storage device via the power conversion device by the commercial power source to supply the load device power. 200903947 r When the c-type c is continuously detected, the terminal voltage of the power storage device is continuously detected. If the terminal voltage of the power storage device is greater than the fourth preset value, the mode B is entered, otherwise the input-plate type D, wherein the mode d The first switching device and the first switching device are turned off, the third switching device is turned on, and the connection between the power storage device and the load device is cut off, so that the system stops supplying power. Continuously detect the terminal voltage of the power storage device, five preset values, then enter the mode B, step (g) can complete the entire multi-mode power supply

(g): In the mode D, when the voltage of the terminal of the power storage device is greater than the third, the mode D is continued. (h): Repeat step 卬) to control the step system. The invention combines the power supply of the solar energy and the commercial power system to the load device and cooperates with the power storage device to store the electric power as an emergency power source, thereby improving the guiltiness of ^=. At the same time, the programmable circuit is used to realize the control circuit 】 = volume 'saving space. And the disturbance observation method is used to make the solar panel maximize the benefits, and the wood structure is simple and easy to control. Eight L Embodiments The power supply system (4) is not in accordance with the present invention - the preferred embodiment. A circuit 120, a control circuit 13A, a replacement device 140, and a load-loaded 切β丄 loader 150 are included. The power supply device 11〇 includes a solar module U1 and a city t. The old 112° main circuit 120 includes a high power tracking device 121, and a second switching device 122. A liter 200903947 - power conversion The device 124 and the third switching device 6 control circuit 130 include a microcomputer to control the solar module 1U as a source of main power, and the plurality of solar panels can be powered by the solar-power module according to the required power. In this real: \ parallel or series-parallel combination of the voltage is about 17~20 volts

Between the temples 0 1), the boost converter Π3 is used to boost its voltage to 24 volts to provide (10) the 24 volt (v〇u) voltage required for the power storage unit i126.

The pressure converting devices 123, 125 and a power storage device device 131. When the solar module 111 is unable to supply electric power (in the case of no sunlight on a cloudy day, in a rainy day or at night), and the electric storage device is also discharged (4) to supply electric power, the system uses the commercial power source 112 as a backup power source. The backup power supply provides an AC power source of 110 volts or 22 volts at a frequency of 6 Hz (Hertz, Hz). In order to comply with the 24 volt DC power supply required by the system of the present invention, the AC power of the commercial power source 112 is converted into a DC power source by the power conversion to supply the load device 150 and the 24 volt power supply required for the power storage device 126. . In this embodiment, the load device 150 is an LED traffic sign device. The power storage device 126 includes a first voltage sensor, and the voltage sensor of the first voltage sensor detects the voltage of the power storage device 126 is determined by the microcomputer control device 131 to control the timing of the power supply 112 to be added to the power supply to avoid the solar module. 1U cannot supply power, causing the load device to stop. In this embodiment, the power conversion device 124 is a flyback converter (Flyback Converter).

C

J 200903947 Due to the solar module's 1 degree/degree, component aging and optoelectronic materials, etc.: 2: It will be subjected to the intensity of the exposure, and the temperature group 111 will exert its performance, so that the solar module can be used as Yuan Da power output point, in the present example, using disturbance observation 1 h and 2b, 4 = up: take high power tracking. Please refer to the voltage and power curve of the solar cup that is not painted by the mouth. Disturbance 颧 too% of this board + (four) (four) ❹ 由 由 由 由 由 由 由 由 At At At At At At At At At At At At At At At At At At At At At At At At At At At At At At At At At At At At At At At At At At At Bay (4) The output dust and output power after the move to determine the next increase and decrease load. During the unloading period, the output power of Putian is larger than before the change. The load will continue to move in the same direction. On the contrary, if the output power is changed before Odagi 'month JJ c ' <A) ', it means that it needs to be next. The cycle changes the direction of the load change. 卜Bag A repeatedly disturbs the 'observation and comparison, so that the solar panel can reach its maximum power point tracking control. Please refer to Figure 1 and Figure 3. The third ride A flow chart for the principle of maximum power tracking control. The maximum power tracking device (2) includes a current sensor and a second voltage sensor for extracting a voltage signal (Vget) and a current signal of the solar module 111. (Iget), as in step 31. The voltage and current signals are fed back to the microcomputer control device (3), and the analog signals are converted into digital signals by the built-in analog/digital converter and the power is calculated (pnew =vget xlget), as in step 32G, compare the new power (pnew) with the old power (P()] d), as in step 33, when the new power is greater than the old power, increase the M converter Medium crystal I wide modulation (Pulse Width Modulation, PWM) duty cycle (Duty Cycle), duty cycle increases, as in step 331, otherwise, responsibility 11 200903947 cycle reduction, as in step 332, when new power (υ is equal, as in step 340, Ρ μ θ + force sheep (P〇) d) ^, 功率 power tracking, as in step 350, the above process is used to control the on-time of the crystal switching of the boost converter, so that the solar module ln = 2 Ο Ο = device m is - race Pu micro system coffee (10) heart. Plus (four) Gong Chip, .s〇c). System - Chip - TMes - n Electric:: Figure 1 'Although the boost converter 123 can put the solar mode, 'and (1) output DC The low voltage is raised to DC high voltage, but there is a certain upper limit to the boost. When the output voltage of the solar module U1 is too low, the voltage boosted by the boost converter i 123 will not continue to provide the power storage device to continue charging. The second switching device 122 is used as a control switch for connecting the maximum power=vertical device m and the boost converter device 123. When the microcomputer control device ι31 detects the solar module (1) by the voltage sensor: the wheel is discharged less than the first pre- When setting the value, The control signal is sent to the second odor-removing device m to operate, so that the boost converter 123 can cut off the maximum power of the device and then cut the solar module U1 away from the boost converter 123' until the solar module When the output voltage value of the group lu is greater than the first preset value, it is further connected to the boost converter 123 to continue the power supply. In this embodiment, the first preset material is 15 volts, and the second switching device can It is a solid state relay. In addition, when the fine power storage device 126 has been charged to a full potential, that is, a second preset value, in order to avoid overcharging of the power storage device 126 to ensure the life of 12 200903947, it is also possible to control the second switch. The device i22 is too active & the module (1) causes the circuit to no longer charge the power storage device 126. : In the example, the second preset value is 28 volts. After the second switching device 122 is turned off, the power storage device 126 continues to supply power to the load device 150. When the first voltage sensor is determined that the voltage of the set 126 has been discharged to be lower than the third preset value, the first action 125 must be turned on 'Let the mains power source 112 pass the power conversion device 124 n «power supply . In this embodiment, the third preset value is 22 volts, and the second switching device can be a solid state relay. x However, if the continuous solar, rainy day or any charging situation that makes the solar module (1) = storage Μ 126, the listed electric power supply u2, also "produces electricity, will cause the voltage level of the power storage device 126 to decrease. When the potential of the livestock electrical device 126 is lower than the fourth preset value, in order to avoid excessive discharge of the electrical storage device f 126, the electrical storage device 126 must be cut away from the system to extend the life of the electrical storage device 126. Therefore, the first switching device 14 is provided. 〇, when the action is made, the negative 15G is connected to the main circuit 12G, and the power storage device 126 stops the discharge until the power of the commercial power source 112 is restored, or the solar module 111 can supply power to make it store X. When the terminal of the 126 is greater than the fifth preset value, the first switching device 14 动作 will be turned on to restore the power supply, and the system continues to operate. In this embodiment, the fourth preset value is 21 volts, The fifth preset value is % volt, and the first switching device is called a solid state relay. The system according to the present invention provides priority to power generated by the solar module 111 during the day to the load device 15 for use. Remaining power 13 Ο Ο 200903947 1 The power storage device 126 is charged for use at night or during power-on. When the power generated by the solar module 111 is not supplied, the commercial power source U2 assists the power supply and charges the power storage device 126 to: For the power supply, the function of power supply in the multi-mode can improve the power supply; please refer to FIG. 4, which is a control flow chart of the power supply system according to the present invention. = system control method, this control method is for the power transmission of the solar module = the end of the device is measured and judged to control the switching; the system is put into different modes of operation. First, the system will reset first. In step 41, the switching device and the second switching device, the third switching device is turned off. The voltage detection = determination is performed as in step 42 °, and the output voltage of the solar module is measured (4). There are four cases, the situation -: the solar cell outlet voltage is greater than a first - preset value and the power storage is terminated: two preset values; case two: the output voltage of the solar module is greater than the preset value of the younger The terminal voltage of the device is greater than the second value; the situation: the output voltage of the electric power is less than the first preset value and the terminal voltage of the stored electric shock is greater than the second preset value, and the bar, the w I value and the sunny state 4: solar energy If the output voltage of the module is less than the preset value and the terminal voltage of the power storage device is less than the second preset channel, the mode A is entered. In step 430, the first switching device and the second switching device are turned on. Turning off the third switching device, causing the solar module to charge the power storage device via the boost converter device and providing power to the load device. In the mode A, the voltage of the solar module 14 200903947 is outputted and the power storage device is The power plant is stronger than the first one: the electric power is repeatedly 'when the solar module's wheel is out of the pre-sighing value and the terminal voltage of the power storage device is two preset values, then the mode A, _, enters the m 1 field to occur f In the case of month--, case 3 or case 4, the mode is entered as step 440. At this time, the 笙, ., 八, β, the first switching device is turned on, and the second switching device and the second switching device are turned off. f electric device provides load device power separately' In the mode B, the terminal voltage of the power storage device is measured. a ο (4) When the electric dust at the end of the electric device is greater than the third preset value, then: the second work 'B otherwise enters the mode c, the gentry step is biased, the first-cut, and the third switching device are turned on, and the second is turned off. The switching device charges the power storage s by the mains power supply and the power conversion device to supply the load device lightning force. In the mode C, detecting the power terminal of the power storage device, if (4) the terminal voltage of the livestock electrical device is greater than the fourth preset value, then enter the mode or enter a mode D, such as step, close the first A switching device f2 switching device 'turns on the third switching device, cuts off the load connection of the power storage device*, and stops the system from supplying power. In the mode D, the power storage device = terminal voltage is detected. If the step is complete, the voltage of the terminal of the power storage device is greater than the fifth predetermined value, then the mode β is entered, otherwise the mode ρ is continued. The above steps can be repeated to complete the control of the entire multi-mode power supply system. In the above embodiment of the present invention, the first preset value is 15 volts, and the second preset value is 28 volts, the third preset value. It is 22 volts, the fourth preset value is 21 volts, and the fifth preset value is 24 volts. The multi-mode power supply system mentioned above will be tested below. In this embodiment, two 500 watt tooth lamps are used as the solar module. Please refer to Fig. 5, which shows the measured waveform of the charging current of the solar module under the maximum power tracking control and the charging device is charged by the boost converter. The boosting converter charges the charging device with a charging current 510, wherein the reference level 511, and each grid width represents 5 〇 #s, and the height represents 0.5A. Please refer to FIG. 6 , which is a measured waveform diagram of the voltage of the power storage device and the power supply current of the commercial power supply when the third switching device operates to supply the mains power supply in parallel. When the voltage 6丨〇 of the power storage device is lower than the third preset value (22 volts), the third switching device operates to supply the mains power supply in parallel, and the current 620 of the mains power source charges the power storage device, so that the voltage 610 of the power storage device can be Pick up. The voltage 61〇 refers to the reference level 611, and each grid width represents 50# s, the height represents lov, and the current 62〇 refers to the level 621, and each grid width represents 50#s ’ height represents 〇.5A. Referring to Fig. 7, it is shown as a measured waveform of the voltage of the power storage device and the current required by the load device when the first switching device operates. When the solar energy unit and the mains power supply are unable to supply power, the power storage device will continue to discharge. 'In order to avoid the over-discharge of the power storage device, its life is affected. When the voltage 710 of the power storage device is less than the fourth preset value (21 volts), When the switching device operates, the power storage device stops the current required to supply the load device, and the power storage device no longer discharges, and the open circuit voltage rises due to the characteristics of the power storage device. The voltage 710 therein is referenced to the level 711, and each grid width represents 50 from the s' height representing 10V' and the current 720 is referenced to the level 721, and the parent-grid representation represents 50/zs' southness representing 〇5A. Although the present invention has been disclosed in a preferred embodiment as above, it is not intended to limit the invention to any of the skilled artisan of the present invention. The scope of the invention is defined by the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS In order to make the above and other objects, features, advantages and embodiments of the present invention more obvious, the detailed description of the drawings is as follows: 〇 〇 FIG. A schematic diagram of a multi-mode power supply system for a preferred embodiment of the soil. Figure 2a is a graph showing the voltage and power curves of a solar panel in accordance with the perturbation observation method employed in the present invention to increase voltage perturbations. Figure 2b is a graph depicting the voltage and power of a solar panel to reduce voltage disturbances, not in accordance with the present invention. Figure 3 is a flow chart showing the principle of maximum power tracking control of the present invention. Figure 4 is a control flow diagram of a multi-mode power supply system in accordance with a preferred embodiment of the present invention. Fig. 5 is a graph showing the measured waveform of the charging current for charging the power storage device by the boost converter device at the maximum power of the solar module of the present invention. Figure 6 is a diagram showing the measured waveforms of the power supply current of the power storage device when the third switching device operates to make the mains power supply in parallel. Figure 7 is a diagram showing the measured waveform of the current required by the voltage and load device when the first switching device operates.

[Main component symbol description] 1〇〇: Multi-mode power supply system 111: Solar module 120: Main circuit 122: Second switching device 124: Power conversion device 126: Power storage device 131: Microcomputer control device 150: Load device 410-490 Multi-mode power supply control step 110: power supply device 112: mains power supply 121: maximum power tracking device 123: boost conversion device 125: third switching device 130: control circuit 140: first switching device 310-350: maximum power tracking control Step 510: Charging current 511: Charging current reference level 610: Battery voltage 611: Battery voltage reference level 620: Mains supply current 621. Mains supply current reference 71 〇: Battery open circuit voltage

Bit 720: Battery discharge current 711: Battery open circuit voltage reference level 721: Battery discharge current reference level 18

Claims (1)

200903947 X. Patent application scope: 1 _ A multi-mode power supply system, comprising: a mains power supply-power supply device ??? a solar module and a first switching device; connected to the power supply device and the first switching device a maximum power tracking device connected to the solar module to capture one of the output voltage signals and the current signal of the solar module; a second switching device connected to the maximum power tracking device. a conversion device connected to the output voltage signal of the second switching I (four) liter solar module; a power conversion device connected to the mains power; a third switching device connected to the power conversion device; The device is connected to the material M conversion device 4 and the third switching device, and the control circuit receives the money output voltage signal and the output f flow signal, and the voltage of the output of the maximum power tracking device in the main circuit. The signal 'controls the action of the first switching device, the changing device and the third switching device according to the received output voltage signal and the output motor λ number and the terminal voltage signal. ^—Cut 2. If applying for the multi-mode power supply system described in (4), the current system is connected to a load device to turn off the power: The load device is an LED traffic sign. ',%Λ 19 200903947 3. As claimed in the patent scope system}, wherein the multi-mode power supply control device described in the control item 2 is: - a microcomputer control device, the microcomputer Svstem 2 system chip (wmable) System-〇n Chip, PSoC) 〇4 The multi-mode power supply system described in item 3 of the patent scope, η It is a solid state relay that is equipped with a solid state relay 'the second switching device is - the twentieth cutting device. ^ In the multi-mode power supply system described in claim 4, the power conversion device is a flyback power converter - Converter. 6: The multi-mode power supply system of claim 5, wherein the livestock electrical device comprises a -first voltage sensor, the maximum power tracking device comprises a second voltage sensor and a current Sensor. The multi-mode power supply system of claim 6, wherein the first voltage sensor and the second voltage sensor are sensors that obtain voltage by a resistor divider method.丨· A control method for a multi-mode power supply system, comprising the following steps: (a) resetting the system; 20 200903947 (b) detecting a signal of a solar module and a signal of a power storage device; (c) determining when the solar module If the signal of the group is greater than a first-preset value and the signal of the power storage device is less than a second preset value, then enter a mode A, otherwise enter the mode B, wherein the mode A uses the solar module to provide power, the mode The beta system uses the power storage device to provide power; (-d) continuously detecting the signal of the solar module and the signal of the power storage device when the mode is ' when the signal of the solar module is greater than the first preset value and If the signal of the power storage device is less than the second ship value, the mode A is continued, otherwise, the mode β is entered; (e) in the mode b, the signal of the power storage device is continuously detected, and the signal of the Tianhe power storage device is greater than When a third preset value is continued, the mode B 'continues to enter a mode c, wherein the mode c uses a mains power supply to provide power; (f) in the mode C, continuously detects the signal of the power storage device When the signal of the power storage device is greater than a fourth preset value, enter the mode B' otherwise enter a mode D, wherein the mode stops the power supply; and (g) when the mode D, continuously detects the power storage The signal of the device enters the mode B when the signal of the power storage device is greater than a fifth preset value, otherwise the mode D is continued. 9. The control method of the multi-mode power supply system as described in claim 8 of the patent application, further comprising - step (h), repeating steps (b) through (g). 21 200903947 1 〇. The control method of the multi-mode power supply system according to claim 9, wherein the signal of the solar module uses a voltage signal, and the signal of the beta power storage device also uses a voltage signal. The control method of the multi-mode power supply system according to claim 10, wherein the first preset value is 15 volts, the second preset value is 28 volts, and the third preset value is 22 volts, the fourth pre- The value is set to 21 volts, (% of the fifth default value is 24 volts. For example, the method of the Jingjing search method, wherein the step (8) is conductive - the first - cut money and a second, set, and close a third switch The switching device of the multi-mode power supply system described in item U is closed: the type A is to turn on the first switching device and the second (J., Jun, turn off the third switching device. 14_If applying The patent control range a control method, the switching device of the 供电 、 斤 模式 模式 mode power supply system, the guide material: the second switching device and the third device guide the first switching device. For example, in the method for controlling the scope of the patent application, wherein the switching device of the mode and the power supply system of the mode is turned off, the first switching and the switching device of the third X-switch are turned off. 22 200903947 16·If applying Multimode control method according to item 12 of the patent scope + 4 夕 模式 mode power supply system, /, the mode D is to close the first switching switch, turn on the third switching device. The device and the second method as the 12th control method of the patent scope, wherein Mode A is a switch device for turning on the == power supply system, turning off the third switching device=setting the second device and the third switching device, the second mode c is turning on the first switching device; The modulo two switching device turns on the first == the first switching device and the eleventh, the following: twenty three