TW540299B - Redundant fan switching method and circuit - Google Patents

Abstract

A redundant fan switching method and circuit is proposed, which is intended for use with a multi-fan system having at least one primary fan unit and a redundant fan unit, for the purpose of detecting whether the primary fan unit operates normally; and in the event of a failure to the primary fan unit, switching on the redundant fan unit to perform fan operation in place of the failed primary fan unit. The proposed method and circuit is characterized by the use of fundamental circuit components rather than microprocessor to perform the required detection and switching operations, which allows the proposed circuit to be more cost-effective to implement and more reliable to operate than prior art.

Description

54〇299 Fifth, explanation (j) [Field of invention]

The present invention relates to a method for automatically switching wind-generating genus and basin: road technology, and in particular, there are at least two kinds of wind-generating systems and reading wind-generating systems, which can be matched to the genus wind-generating system for use in Talking about / with a main fan device and a spare wind device which is reputed to be the main fan device: Wind: When the abnormal operation is started, the standby fan device is replaced to replace the [Background of the Invention] Electronic systems will generate a large amount of electricity due to operation. g ί may damage the circuit in the electronic system, because there is accumulated wind to dissipate the electronic system produced during operation; the heat is equal to m: the circuit will not be thermally damaged during operation. 1. ", to ensure the reliability of the fan's heat dissipation function, at least two fan devices are generally used, including a first-law device, and only the main wind shoulder is usually activated; the fan device and 1 use the wind as the wind to operate the main fan device When abnormal, turn off the main unit and start the backup fan device to get the air supply function. There are many different types of backups to automatically detect whether the main fan unit is working normally. When it is used as an abnormality, the main fan unit is turned off and ^, the main wind is a function of the fan air of the fan unit.

At present, there is a known technology that uses whether or not Yuchang is operating, and the main fan device is earth-steel and the main air device is closed and the standby wind device is activated. /, When the time, will be the main wind J

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540299 1 -----.—— V. Description of the invention (2) ____ However, the use of a microprocessor to perform the backup fan is not only necessary because of the higher price of the required microprocessor, but also the production cost of c-. It is expected that, because the microprocessor: 2 is an increase ▼ the cow has a higher failure rate, so the reliability of the automatic switching circuit of the fan using the dagger type is poor. Microprocessor preparation [Overview of the invention] In view of the shortcomings of the conventional technology described above, the main purpose of this invention is to provide a method for automatic backup fan switching. The processor can perform fan speed pick-up and switch iJ 'It is not low Required hardware cost. Another aspect of the present invention is to provide a circuit and a circuit thereof, which can have a higher reliability of the automatic switching of the backup fan. The automatic switching method of the backup fan of the present invention ~ a fan system, and the fan system Having a = circuit is used to match the slave device to detect whether the main fan device is two. When the device and a backup user fan module are abnormally operated, the main fan device is shut down and operated; The device is set to shut down and start the standby wind. The automatic switching method of the standby fan of the present invention and the use of basic electronic parts instead of a microprocessor are characterized in that ′, the reliability of the required switching can be further reduced compared with the conventional technology. 1Increase the hardware cost and increase. [Inventive embodiments] In accordance with the accompanying drawings, the different embodiments of the automatic switchover method and its circuit of the present invention will be disclosed in detail. spare

540299 — V. Description of the invention (3) Figure 1 shows the basic circuit architecture of the first embodiment of the automatic switching circuit for the backup fan of the present invention (such as the part enclosed by the dashed box indicated by the reference numeral i 00). As shown in the figure, the backup fan automatic switching circuit 100 of the first embodiment of the present invention is matched to a cooling fan system 10 ′ in actual application, and the fan system 10 has at least a main fan device 10A and a backup fan device. 10B 'and a fan driving unit 20. It should be noted here that the fan system to which the present invention is applicable is not limited to including only one spare fan device, and may also include two or more spare fan devices. The embodiment here is described by taking only one spare fan device as an example ', but the basic idea of the present invention can also be applied to a fan system having more than one spare fan device. A backup fan automatic switching circuit 100 according to the first embodiment of the present invention includes at least: (a) a switching unit 11; (b) a fan speed pulse wave feedback unit 120A, (c) an integrator i300A And (d)-comparator i4OA. The switching unit 110 has at least an input terminal IN, a first output terminal OUT1, a second output terminal OUT2, and a switching control signal input terminal C; wherein the switching unit 110 is initially preset to use its input terminal IN is connected to the first input terminal OUT1; and when the switch control signal input terminal c receives the "switch enable signal" sw, it is switched to connect its input terminal N to the second output terminal OUT2. In other words, the switching unit 1 10 is initially preset to connect the fan driving unit 20 to the main fan device 10A, thereby driving the operation of the main fan device 10A; and a switch control signal input terminal C receives a Switch enable letter

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Page 7 540299 V. Description of the invention (4y

When the number is SW, the device is 10 A. F 'Switch the fan drive unit 20 to a connection to drive the operation of the standby fan unit 10B and turn off the main fan fan unit 20 at the same time as the standby fan unit. For example, the pulse width modulation technology (Pulse «^ dth ModUlation, PWM) is used. To control the operation speed of the main fan device 10A and the backup fan device 10B. Since the PWM technology is a field of electronic and electrical engineering = conventional and well-known technology, its technical details will not be described in further detail in this specification. 8. The fan speed pulse wave feedback unit 120A is connected to the main fan unit 10A ′ to feedback the fan speed pulse wave series PA generated by the main fan device ιOA during operation. The signal waveform diagrams in FIGS. 3A to 3C show the signal waveforms of the fan speed pulse train series λ generated by the main fan device 10A at different speeds; FIG. 3A shows the main fan device 1OA at high operating speeds. The signal waveform of the fan speed pulse train series PA generated; FIG. 3B shows the signal waveform of the fan speed pulse train series PA generated by the main fan device 10A at a low operating speed; and FIG. 3C shows the main fan device The signal waveform of the fan speed pulse train PA generated when 10Α is stuck by an external force and cannot be rotated. The feedback fan speed pulse wave series PA can be directly taken from the motor circuit of the main fan device 10A (not shown in the figure). The integrator 130A is connected to the fan speed pulse wave feedback unit 120A, and is used to perform an integrating action on the fan speed pulse wave train PA provided by the fan speed pulse wave feedback unit 120A, and thereby output an integral. The voltage signal νΑ; and the voltage value of the integrated voltage signal VA represents the integral value of the input fan speed pulse wave series PA over time. Basically, the rotation speed of the main fan device 10A

16857.ptd Page 8 540299 V. Description of the invention (5) ~ ---——- ^ The greater the ', the greater the voltage value of the integrated voltage signal VA; the smaller the rotation speed of the device 10A, the greater the integrated voltage signal ^ The voltage of the main fan is small. Since the integrator 130A itself is a conventional circuit structure, its internal circuit structure will not be described in further detail below. 'Therefore, the comparator 140A is connected to the integrator 30A, and used to compare the integrated voltage signal output by the above-mentioned Jiba device 1 30A with 4 μ \ to compare with a preset threshold = knife; that is, the integrator 130A is compared. The output integrated voltage signal = voltage value = whether it is lower than the preset threshold voltage value. If yes, the enable signal SW is generated and switched. The preset threshold voltage value v can be obtained by pre-f. The above-mentioned comparator 140A can be implemented in practice through experiments in advance. The above-mentioned comparator 140A may be, for example, an analog comparator constructed by an Operational Ampl if ier (oop), which can maintain its analog value when VA- ^ The output terminal is in a logic low potential state; when VA < VTH, a logic high potential signal is generated at its output terminal, which is used as the aforementioned switching enable signal. The comparator 140 A itself is a conventional circuit component, so its internal circuit structure will be described in further detail below. '' In practical application, since the switching unit 110 is preset to connect the fan driving unit 20 to the main fan device 10A, so the fan drive will cause the early element 20 to drive only the main fan device 10A when the power is turned on and not to drive the backup. Air shoulder device 10B. % When the main fan device 10A starts to operate, the fan speed pulse train PA generated by the main fan device will be fed back to the integrator 130A through the fan speed pulse feedback unit 1 2 OA, causing the integrator 130A to perform the operation. Integral to produce 1

540299 V. Description of the invention (6) An integrated voltage signal VA, and the voltage value of the integrated voltage signal L is the integral value of the fan speed pulse wave series Pa over time. Represents the integrated voltage signal generated by the back-product 130A ^ followed by 14AA ', whereby the comparator "0A will the voltage value of $ of the integrated voltage signal v be lower than the number vA * the preset threshold voltage v 】 Jiaopu 'voltage signal generates a switching enable signal SW, and the switching enable signal ^ 2 ^' is the switching control signal input terminal C of the switching unit 110. The switching control signal is transmitted to the switching switching unit 1 1 0 When terminal C receives the energy signal SW, it will switch its input terminal from the original first input '= to the second output terminal OUT2, or change the fan drive unit to the backup fan device 10B'. In this way, the backup fan device 10B is driven and the main fan device 10α is turned off at the same time; that is, the backup fan feather device 10B is used to replace the air supply function of the main fan device 10A. The second figure 2 shows the backup fan of the present invention. The basic circuit architecture of the second embodiment of the automatic switching circuit (such as the part enclosed by the dashed box indicated by the reference number 〇〇〇). In the second embodiment shown in FIG. 2, the same as the first embodiment The component system is also the same The first embodiment of the present invention shown in FIG. 1 can only switch the fan driving unit 20 to be connected to the backup fan rack 10B when an abnormal condition occurs in the main fan unit 1QA, so that the backup fan unit 10B can be used. To replace the air supply function of the main fan device 10A; and the second embodiment here can further issue a warning signal to notify the use when the standby fan device 10B also has an abnormal condition

16857.ptd Page 10 540299 V. Description of the invention (7) '1 ~ --- Perform necessary maintenance work. As shown in Figure 2, the second embodiment of the present invention is a backup fan = 100 of the first, which is different from the aforementioned first embodiment in that it further ^ ^ fan speed pulse wave feedback unit 12〇β; An integrator 13β; a comparator 140B; and a warning signal generator 150. The fan speed pulse wave feedback unit 12〇β, integrator 13〇β, and 140B can be exactly the same as the fan speed pulse i = m2OA, integrator, and comparator ΐ4 in the first embodiment described above. Α; Therefore, its function will not be repeated here. When the backup fan device 10B also has an abnormal condition, it will cause a logic higher potential signal than that of 140B to be used as a warning enable signal. This = enable signal A—transmitted to the warning signal. 150 sends a signal indicating that the fan system 10 is required to perform necessary maintenance work. [Conclusion] According to § the invention according to the present invention-the replacement method and its circuit, which can be equipped with SF's standby fan automatically cut at least with a main fan device and a standby system when the fan system fan device operates abnormally: It is used for the main air supply function; it is characterized by using Meier = to replace the main fan device to perform detection and switch # soil. The cost of the parts instead of the hardware required to increase the cost and increase: = degree can be more reduced than the conventional technology. The above is only the invention of the present invention. It does not limit the essential technical content of the invention. The sacrifice of the valley. Essential technical content of the present invention

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16857.ptd Page 12 540299 Brief description of the drawings [Brief description of the drawings] The essential technical content of the present invention and its embodiments have been disclosed in detail in the drawings. The contents of these drawings are briefly described as follows: FIG. 1 is a system block diagram showing the basic circuit architecture of the first embodiment of the automatic switching circuit for the backup fan of the present invention; FIG. 2 is a system block diagram showing the The basic circuit structure of the second embodiment of the backup fan automatic switching circuit of the present invention. Figures 3A to 3C are signal waveform diagrams, which show signal waveforms of fan speed pulse trains generated by the fan device to which the present invention is applied at different speeds. [Explanation of reference numerals] 10 Radiating fan system 10 A Main fan device 1 0 B Standby fan device 20 Fan driving unit 1 0 0 Automatic backup switching circuit of the first embodiment of the present invention 1 0 0 'Second embodiment of the present invention For example, the standby fan automatic switching circuit 110 switching unit 1 2 0 A fan speed pulse feedback unit 1 2 0 B fan speed pulse feedback unit 1 3 0 A integrator 1 3 0 B integrator 1 4 0 A comparator 1 4 0 B comparator 150 warning signal generator

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Claims (1)

540299 6. Scope of patent application 1. An automatic switching method for a backup fan, which is applicable to a fan system, and the fan system has at least a main fan device and a backup fan device for starting when the main fan device operates abnormally The spare fan device and the spare fan automatic switching method include at least: (1) obtaining a fan speed pulse train generated by the main fan device during operation; (2) obtaining a fan speed pulse train generated by the main fan device; Integrate the column to obtain its integral value over time; and (3) compare whether the integral value is lower than a preset critical value; if so, turn off the main fan device and start the backup fan device at the same time. 2. The automatic switching method for a backup fan as described in item 1 of the scope of patent application, which further includes the following steps after step (3): (4) obtaining a fan speed pulse generated by the backup fan device during operation Cascade; (5) integrate the fan speed pulse train series generated by the backup fan device to obtain the integral value of time; and (6) compare whether the integral value is lower than a preset value Critical value; if yes, a warning signal is generated. 3. An automatic switching method for a backup fan, which is applicable to a fan system, and the fan system has at least a main fan device and a backup fan device for starting the backup fan device when the main fan device operates abnormally. The backup fan automatic switching method includes at least: 16857.ptd Page 14 540299 16857.ptd Page 15 540299 6. The scope of patent application is to integrate the fan speed pulse train feedbacked by the fan speed pulse wave feedback unit to output an integrated voltage signal; and (d ) — Comparator, which can compare whether the voltage value of the integrated voltage signal output by the integrator is lower than a preset threshold voltage value; if it is', then a switching enable signal is generated to enable the switching unit to switch the fan The drive unit is switched to be connected to the backup fan unit. 5. The backup fan automatic switching circuit as described in item 4 of the scope of patent application, further comprising: a fan speed pulse wave feedback unit of a backup fan device, which is connected to the backup fan device for feedback The fan speed pulse wave series generated by the standby fan device during rotation; an integrator of the standby fan device, which is connected to the fan speed pulse wave feedback unit of the standby fan device, and is used for the standby fan device. The fan speed pulse wave feedback unit of the fan speed pulse wave feedback unit performs integration to output an integrated voltage signal; a comparator of a standby fan device, which can compare the output of the integrator of the standby fan device. Whether the voltage value of the integrated voltage signal is lower than a preset threshold voltage value; if so, a warning enable signal is generated; and a warning signal generator that can respond to the warning generated by the comparator of the backup fan device Can signal and generate a warning enabling letter. 6. The backup fan automatic switching circuit as described in item 4 of the scope of patent application, wherein the comparator of the main fan device is an analog comparator constructed by an operational amplifier. 16857.ptd Page 16 540299 6. Scope of patent application 7. The backup fan automatic switching circuit described in item 5 of the scope of patent application, wherein the comparator of the backup fan device is an analog comparator constructed by an operational amplifier. 8. The backup fan automatic switching circuit as described in item 4 of the scope of patent application, wherein the fan drive unit uses pulse width modulation technology to control the operation speed of the main fan device and the backup fan device. 16857.ptd Page 17