TWI258263B - Modular power supply system - Google Patents

Abstract

A modular power supply system incorporating a power status signal generator circuit to detect the voltage sag of the input peak voltage within a short period is proposed. The power status signal generator circuit mainly includes a peak detector that detects a peak value of an input voltage, wherein the peak detector comprises a first comparator that compares the input voltage with a predetermined reference voltage and sends an output signal according to a comparison result thereof, a RC network connected to the first comparator and is configured to charge and discharge the capacitor according to the output signal of the first comparator, and a second comparator connected to the resistor-capacitor network that compares a terminal voltage of the capacitor of the resistor-capacitor network with the predetermined reference voltage and generates a power status signal according to a comparison result thereof.

Description

1258263 _ Case No. 92137768_Yearly revision _ V. Description of the invention (1) [Technical field of the invention] _ The present invention relates to a modular power supply system (m 〇du 1 ar power supply system), and In particular, the present invention relates to a modular power supply system including a power status signal generating circuit that continuously monitors the power supply status of an AC power source connected to the modular power supply system, and in a short time A voltage drop problem of an input AC peak voltage is detected. [Prior Art] A typical modular power supply system is designed to receive AC power from a mains AC power source via a power line, and then deliver DC power to one or more load devices via appropriate power conditioning steps. A modular power supply system according to the prior art is illustrated in Figure 1. The modular power supply system 10 of FIG. 1 generally includes an AC power source 1 1 , an electromagnetic interference filter 1 2, a bridge rectifier 13 , and a DC-DC converter 14 . The AC power source 11 is used to provide an input AC voltage, whereas the EMI filter 12 is used to eliminate electromagnetic interference components remaining in the input AC voltage. The bridge rectifier 13 is connected to the electromagnetic interference filter 12 for converting the filtered alternating voltage into a desired input voltage, and the DC-DC converter 14 is configured from the bridge rectifier 13 The rectified input voltage is received and the input voltage is converted to a desired DC voltage to provide suitable power to a load device (not shown). Furthermore, the modular power supply system 10 further includes a power status signal generating circuit 15 for monitoring the power supply status of the AC power 1, 1, and

Page 9 1258263 _ Case No. 92137768_Yearly 曰 Revision _ V. Invention Description (2) If the AC power supply 1 1 fails or is removed from the modular power supply system 10, the AC power 1 1 is detected. Enter the voltage drop problem of the peak voltage. The power state signal generating circuit 15 according to the prior art comprises a half-wave rectifier 1 51, a resistor-capacitor charging/discharging network 1 5 2, a resistor-capacitor filter 1 5 3, and a voltage comparator. 1 5 4. The AC voltage supplied by the AC power source 1 is first rectified by a half-wave rectifier 151, which is typically implemented by a diode element. Then, a resistor-capacitor charging/discharging network 152 composed of a capacitor C 1 0 0 and a resistor R1 0 0 is used to perform charging/discharging operation on the capacitor C1 0 0 so as to The peak value of the input AC voltage is detected from the angle across the voltage across the capacitor C 1 0 0 . A resistor-capacitor filter (RC filter) 153, coupled to the resistor-capacitor charging/discharging network 152, acts as a second-order low-pass filter to filter and smooth across the voltage across the charge/discharge capacitor C 1 0 0 . The output of the resistor-capacitor filter 1 5 3 is passed to an inverting input of the voltage comparator 1 5 4 and compared to a reference voltage V ref to determine the peak value of the input AC voltage from the AC power source 1 1 . Whether it falls below a predetermined level. If the peak value of the AC voltage drops below a predetermined level, the voltage comparator 14 4 outputs a power status signal (AC-ΟΚ signal or AC-BROWN OUT signal) to indicate that the AC power source 1 is working normally or The AC power supply 1 1 is deteriorating. As described above, the main function of the power state signal generating circuit 15 of Fig. 1 is to detect the peak value of the input AC voltage and determine whether the peak value of the input AC voltage drops below a predetermined level. In a typical modular power supply system, the frequency of an input AC voltage is estimated to be 50.

Page 10 1258263 _ Case No. 92137768_Yearly 曰 Revision _ V. Description of invention (3)

Hz, meaning that the time between two adjacent peaks of the input AC voltage should be estimated to be 20 microseconds. If the peak value of the incoming AC voltage drops suddenly below a predetermined nominal value, it may cause the entire system to stop its operation or cause the entire system to malfunction. In order to detect the voltage drop of the input AC peak voltage as quickly as possible, the power state signal generating circuit 15 must detect the voltage drop of the input AC peak voltage in a short period of time, and detect the voltage drop. A suitable power status signal is sent to inform the system of the occurrence of an AC fault condition (AC fai 1 urec ο nditi ο n ), enabling the diagnostic function of the modular power supply system to be activated to identify the real cause of the malfunctioning system operation. A common requirement for detecting the setting of an input AC peak voltage is defined as a power supply cycle of the input AC voltage, that is, 20 microseconds. However, the power state signal generating circuit 15 of the prior art suffers from some major drawbacks such that it cannot meet such requirements. One of these major drawbacks stems from the resistance-capacitance waver 1 5 3 . In order to obtain a smoother voltage waveform, the capacitance used in the resistor-capacitor filter 1 5 3 is usually achieved by a large capacitor. As a result, a significant amount of time delay caused by the resistor-capacitor filter 153 is added to the time set for the detection voltage drop problem. That is to say, if there is a problem of an AC fault, the power state signal generating circuit 15 cannot judge the voltage drop of the input AC peak voltage at the moment when the faulty system operation occurs, and sends a suitable power state signal to the modular power source. The supply system 10 is delayed for a considerable period of time. In actual operation, the measured result of this time delay is as high as 100 microseconds (100).

1258263 _ case number 92137768_year month 曰 correction _ five, invention description (4) m i t r 〇 s e c ο n d s ). In this case, the modular power supply system 1 cannot immediately confirm the real cause of the malfunctioning system operation. This significant amount of time delay is sometimes unbearable and does not meet the requirements for rapid drop detection of the input AC peak voltage drop caused by AC power supply 11. In view of this, there has been a trend toward the development of a modular power supply system 10 that includes a power state signal generating circuit capable of performing rapid fall detection of an input AC peak voltage. SUMMARY OF THE INVENTION A main object of the present invention is to provide a modular power supply system including a power state signal generating circuit that can detect a voltage drop problem of an input AC peak voltage and send a suitable power state signal to the module. The power supply system indicates that an AC fault has occurred in response to a voltage drop detected in a short period of time. According to the present invention, a modular power supply system includes: a power supply, and a power state signal generating circuit coupled to the power source for detecting a peak value of an input voltage received from the power source, And generating a power state signal indicating a power supply state of the power source, wherein the power state signal generating circuit includes a peak detector that detects a voltage drop of a peak value of the input voltage received by the power source, and The peak detector includes a first voltage comparator that compares the input voltage received from the power source with a predetermined reference voltage and sends an output signal according to the comparison result, a resistor-capacitor network. , connected to

Page 12 1258263 _ Case No. 92137768_ Year Month _ Correction _ V. Invention Description (5) The first voltage comparator is configured to charge and discharge the capacitor according to the output signal of the first voltage comparator, wherein The charging time of the capacitor is less than a discharge time thereof, and a second voltage comparator is connected to the resistor-capacitor network, which compares one end voltage of the capacitor with the predetermined reference voltage, and according to A comparison result produces the power status signal. The foregoing and other features and advantages of the present invention will be best understood from the description of the appended claims <RTIgt; A circuit diagram of a preferred configuration of the group power supply system 20. The modular power supply system 20 of FIG. 2 includes an AC power supply 2 bridge rectifier 2 2 that receives an AC voltage from the AC power source 2 1 via a power line and provides a rectified input voltage to the DC-DC converter 2 3 . . The bridge rectifier 2 2 can be selectively configured as a half-wave rectifier or a full-wave rectifier. The DC-DC converter 2 3 is used to regulate the rectified input voltage to the desired DC output voltage to properly drive a load device (not shown). Furthermore, the modular power supply system 20 incorporates a power state signal generating circuit 24 that continuously detects the state of the AC power source 2 1 and provides a power state signal capable of indicating the power supply state of the AC power source 2 1 . . As shown in FIG. 2, the power state signal generating circuit 24 is basically composed of an attenuator 2 4 2, a peak detector 2 4 3 and a hysteresis circuit 24 4 .

Page 13 1258263

The attenuator 242 is used to input the full-wave rectified input voltage received by the output terminal of the bridge rectifier 22 (assuming that the bridge rectifier 22 is a full-wave rectifier in this embodiment), for example, 110V, proportional The ground level is reduced to a voltage level suitable for performing peak voltage detection of the input AC voltage. The hysteresis circuit 244 is connected between the peak detector 243 and the attenuator 242, and is capable of stabilizing the power state signal outputted by the circuit node located inside the peak detector 243 without causing a power status signal. Causes a beating ^ rebound. The internal group construction and operation principle of the peak estimator 243 will be discussed in detail below. Please refer to FIG. 2 and FIG. 3(a)' wherein FIG. 3(a) is a clock diagram, and the eight display is not according to an embodiment of the present invention, and the power status signal is specified in the implementation==AC-ΟΚ signal system For the power state signal) is the ON period (ON Peri0d) in the power state signal generation circuit with the internal circuit node = several signal waveforms measured. As shown in Fig. 3(a), the signal waveform at the circuit node eight is the unprocessed full-fuced rectified input voltage supplied to the DC-to-DC converter 23, and the peak voltage is set. At the root mean square value of 75v, in the case of full-wave rectification, the frequency is doubled to 1 Hz compared to the original input voltage of the AC power source 21. Therefore: during the packet source period, the period between two adjacent peaks is estimated to be 1 μ microsecond (10 mlcrosec〇nds). After being processed by the attenuator 242, the processed full-wave rectified input voltage is adjusted to a 'level' suitable for peak voltage detection. In the peak debt detector 243, a voltage follower is provided by the bipolar junction transistor 1258263, number 92137768, and the (bipolar junction transistor) Qi. This regulated voltage is connected to the inverting input stomach of a voltage comparator U1 via the voltage follower Q1. The voltage drop to the inverting input of the first voltage comparator U1 will be compared to a reference voltage. The reference voltage is derived from the supply voltage VCC 1 and the voltage dividers R1 3, R 14 . The voltage comparator U1 sends the output signal of a circuit node to an input terminal of the resistor-capacitor network composed of the resistor r 9, R1 〇 and a capacitor ◦ j according to the comparison result. The resistor-capacitor network charges/discharges the capacitor ci based on the output voltage of U1 based on the first pen pressure. The end-to-end voltage of the charge/discharge capacitor measured at circuit node C is equal to the difference between the supply voltage VCC1 minus the voltage across the capacitor C1 and is transmitted to a second voltage comparator U2. The input terminal is input to the ratio of the reference voltage obtained by the supply voltage VCC1 and the dividers R13, RH. The second voltage comparator U 2 sends an output signal to the circuit node D according to the comparison result, wherein the output % of the output of the comparator U 2 is transmitted, and the output of the comparator U 2 is a +, electric, and

Signal. The source state signal (AC-0K S1), the overall operation of the packet source state signal generating circuit 24 will be explained in reference to Fig. 2 (a) and three (b). ..., please refer to Figure 3 (a A It is less than the peak detection level $, the input AC voltage vibration L (10), and the electrical_output on the circuit node c is the electric # bit on the circuit node D will be driven to HIGH. Therefore, on behalf of the AC power: not the original侑纡 output - full power supply. In t2 to 7

S 1258263

921877RR V. INSTRUCTIONS (8) = The amplitude of the incoming AC voltage is greater than the value of the signal on the jb. The signal level on J B becomes L〇w. At the same time, the 佧 circuit is started to be charged via the supply voltage VCn and the network capacitor C1. Capacitor Gu Ershi block resistance, 10 charge loop pair When the charge time of ί is proportional to the time when gold, : number: Temple in resistor R1. The resistance value and the capacitance of the capacitor C1 ': the number r (the RC of the time J)) 'and the charging time will become quite small. The product of the product Rif is selected to be as small as 1 〇〇 Ω = 疋Because the voltage across the resistor will drive LOW and fall below the peak # this circuit node' makes the power supply: source. ▲. During t4, input two turns to turn out - all over the peak detection level, so that the amplitude of the dip on the circuit node B drops to below ΗI G Η, causing the lightning resistance ☆ •, ' the signal level returns to the capacitor The time constant of the two or two electrical steps is much larger than the discharge step: back: release: go out. Because R is the resistance value of R9 (28ΚΩ) plus Bu P1 n (RC, where the electrical time here will continue to be more than 0 resistance value (100Ω) than the charging time), the square voltage level is unlikely to exceed The value is 5 further: however, the circuit node (: the signal level of the upper status signal will be maintained, Γ / bit, and the subsequent operation of the power supply t2 to t3 and the subsequent operation of t3 to t4 are exactly the details For the repetition of the woodwork, please refer to FIG. 3(b), wherein FIG. 2 is a clock diagram according to an embodiment of the present invention, and the OFF period is The power state signal ', the nickname is the number of signal waveforms generated during the shutdown period r. The circuit f inside the circuit 24 is f0 to t1, the AC power source 21 is 1258263

Fifth, the invention description (9), so that the amplitude of ί in i: η is slightly larger than the peak detection quasi-current voltage reaches more than "two quasi two to: signal level in the turn of the turn to repeat its charging and discharging operations, straight Medium drive, and the relationship of capacitor C1 is similar to the reference picture; (4): the signal level of the signal between the charge and discharge time and the discharge time maintains the result of ^ HIGH, Df ^ / /. The voltage measured by the power state is not Exceeding the peak debt because of the peak value of the AC voltage input on the circuit node C, "level." During t1 to 12, the quantity _ #(四)^ value on the road node B is = bit, and the measured signal level on the electric node B = ^ ^ will continue to discharge in the electricity 'and therefore in the circuit: = The capacitor will rise exponentially. As long as the signal level measured by I on the circuit reaches the peak detection level, the signal level measured on g__ will change to L〇w. By measuring the number on the way point D, that is, the power status signal, 胄 即 / ” ” J’s round of the power supply is faulty and cannot provide a full measurement level, which shows the other of the AC system. Part. Therefore, the module with f source to the modular power supply to monitor and detect the power supply of the AC power supply ii': the true cause of the system's controller can be wrong system operation ^ ^ and further judged. Set to detect The problem of measuring the voltage drop problem is about the peak value at time t 〇 has dropped below: value 2 rounds of intersection, voltage condition. In this case, set to detect voltage; = bit break Emotion is equal to the input AC voltage of a power supply week. The time of the yak problem is &quot;(ΐ〇-tl) plus tl to t2

Page 17 1258263 _ Case No. 92137768_Yearly 曰 Amendment _ V. Description of invention (10) Time period. That is to say, in the worst case, the maximum time set to detect the voltage drop problem is 10 microseconds plus a very short period of time from 11 to t2, which is much smaller than in the prior art. Set the time to detect the voltage drop problem. Briefly stated, the present invention provides a modular power supply system including a power state signal generating circuit that can monitor and detect a voltage drop of an input peak voltage in a short time and generate an appropriate power state signal to A modular power supply system quickly indicates that an AC fault has occurred. By incorporating the power state signal generating circuit taught by the present invention into a conventional modular power supply system, the reliability of the power supply system can be easily increased. The present invention has been described in detail by the above-described embodiments, and may be modified by those skilled in the art, without departing from the scope of the appended claims.

Page 18 1258263 _ Case No. 92137768_Year of the month __ BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a system block diagram of a modular power supply system according to the prior art; A plan view showing a circuit configuration for realizing a power state signal generating circuit according to an embodiment of the present invention; FIG. 3(a) is a clock diagram showing a power state signal according to an embodiment of the present invention. During the turn-on period (0 N peri 〇d ), a plurality of signal waveforms measured by circuit nodes inside the power state signal generating circuit; and FIG. 3( b ) is a clock map showing an embodiment according to the present invention, The number of signal waveforms measured by the circuit nodes inside the power state signal generating circuit during the power state signal is OFF period. Schematic diagram description 1 0 modular power supply system 1 1 AC power supply 1 2 electromagnetic interference filter 1 3 bridge rectifier 1 4 DC-DC converter 1 5 conventional power supply sad signal generation circuit 15 1 half wave rectifier 1 5 2 Resistor-capacitor charging/discharging network 1 5 3 Resistor-capacitor filter 1 5 4 voltage comparator 2 0 modular power supply system 2 1 AC power supply 2 2 bridge rectifier 2 3 DC-DC converter 2 4 power supply sad signal generation circuit of the invention 2 4 2 attenuator 2 4 3 peak detector

Page 19 1258263 Case No. 92137768_Year of the Moon_Revision Diagram Simple Description 2 4 4 Hysteresis Circuit ΙϋΙΙ Page 20

Claims (1)

1258263 _ Case No. 92137768_Yearly revision _ Six, application patent scope 1. A modular power supply system, comprising: a power supply and a bridge rectifier connected to the power supply for receiving from the power supply An input voltage is converted into a rectified voltage; a power converter is coupled to the bridge rectifier for receiving the rectified voltage and providing at least one constant voltage to a load device; and a power state signal generating circuit coupled to the power source And detecting a peak value of an input voltage received from the power source, and generating a power state signal indicating a power supply state of the power source, wherein the power state signal generating circuit includes a peak detector, and the detecting Measuring a voltage drop from a peak of the input voltage received by the power source, and wherein the peak detector includes a first voltage comparator that receives the input voltage from the power source with a predetermined reference voltage Comparing and sending an output signal according to the comparison result, a resistor-capacitor network is connected to the first voltage comparison The configuration is configured to charge and discharge the capacitor according to the output signal of the first voltage comparator, wherein a charging time of the capacitor is less than a discharge time thereof, and a second voltage comparator is connected to the resistor-capacitor The network compares one of the terminal voltages of the capacitor with the predetermined reference voltage and generates the power state signal according to a comparison result. 2. The modular power supply system of claim 1, wherein the bridge rectifier is a full-wave rectifier or a half-wave rectifier. 3. The modular power supply system of claim 1, wherein the power state signal generating circuit further comprises an attenuator connected to the bridge rectifier, which is a rectified voltage received from the bridge rectifier Equal proportion Page 21 1258263 _ Case No. 92137768_Yearly 曰 Amendment _ 6. The scope of application for patents is reduced. 4. The modular power supply system of claim 3, wherein the power state signal generating circuit further comprises a hysteresis circuit connected between the attenuator and the peak detector for stabilizing the power supply Status signal. 5. The modular power supply system of claim 3, wherein the power state signal generating circuit further comprises a voltage follower coupled between the attenuator and the first voltage comparator for A voltage drop voltage provided from the attenuator is coupled to an input of the first voltage comparator. Page 22