201126171 六、發明說明： 【發明所屬之技術領域】 [⑽1] 本發明是關於一種測試電路，尤指一種電腦開關電源之 浪湧電流測試電路。 【先前彳支術】 : [0002] 電腦之開關電源是將交流電轉換為電腦工作所需要之各 路低壓直流電源之轉換器。電腦開機瞬間，開關電源會 產生突發之尖峰電流，即浪湧電流。浪湧電流過大將造 ^ 成開關電源部件損傷。為此，電腦廠商均要對開關電源 ❹ 之浪湧電流進行檢測，以確保浪湧電流於安全範圍之内 〇 [0003] 如一種浪湧電流測試電路，用以測試一待測電源之浪湧 電流，其包括一輸入交流電源、一與所述交流電源相連 之橋式整流電路、一為所述待測電源提供測試電壓之電 容組、一連接於所述電容組及待測電源之間之接觸器開 關（如繼電器開關等），電容組充電完畢後，使所述接 〇 觸器開關閉合，對所述待測電源供電。然而，傳統之測 試電路中之接觸器開關之觸點長期與空氣接觸易於氧化 ，於開關閉合時常出現異常之火花干擾，使得測取之電 流之波形出現許多尖銳之毛刺，導致測試結果不準確。 【發明内容】 [0004] 鑒於以上内容，有必要提供一種測試結果較為精確之浪 湧電流測試電路。 [0005] 一種浪湧電流測試電路，用於測試一開關電源通電時產 生之浪涌電流，所述浪湧電流測試電路包括一輸出電源 099102183 表單編號A0101 第3頁/共15頁 0992004202-0 201126171 、一電容組、一電流測量儀及一連接於所述電容組及所 述開關電源之間之晶閘管，所述輸出電源對所述電容組 充電，所述晶閘管導通時，所述電容組對所述開關電源 供電且所述電流測量儀測取所述浪涌電流。 [0006] 與習知浪湧電流測試電路相比，本發明所提供之測試電 路利用晶閘管取代傳統之接觸器開關，測試時晶閘管之 導通不會產生火花，使測試結果更為準確。 【實施方式】 [0007] 請參閱圖1，本發明較佳實施方式浪湧電流測試電路包括 一輸出電源10、一電容組20、一放電電路30、一電壓計 40、一晶閘管50、一電流測量儀器60及一開關電源70。 所述輸出電源1 0包括一交流電源12及一與所述交流電源 1 2相連之橋式整流電路14。所述浪湧電流測試電路用於 測試所述開關電源7 0通電時之浪涌電流。 [0008] 請參閱圖2，所述交流電源12之輸出端接有用於過流保護 之保險絲F1、F 2。所述輸出電源10_之一輸出端藉由一第 一電阻R1及一第一開關K1連接至所述電容組20之正極， 所述輸出電源10之另一輸出端與所述電容組20之負極相 連。所述電容組20包括並聯連接之一第一電容C1、一第 二電容C2、一第三電容C3及一第四電容C4，所述第一電 容C1、第二電容C2、第三電容C3及第四電容C4均為極性 電容（即分正負極之電容）。當所述第一開關K1閉合時 ，所述輸出電源10可向所述電容組20充電，使電容組20 兩端之電壓逐漸升高。 [0009] 所述放電電路30與所述電容組20相聯，所述放電電路30 099102183 表單編號A0101 第4頁/共15頁 091 201126171 [0010] 包括-第二開關K2及一第二電阻R2，所述第二開關㈣ 所述第二電晴φ聯。所述第二關㈣合後可將所述 電容組20儲存之電能放掉。 所述電壓計40與所述電容_及所述玫電電糊並聯， 可測取電容組20兩端之電壓，於關電容組2Q兩端之電 壓上升到測試所需電壓值（如3m)時，應使所述第一 開關K1斷開，停止對所述電容組2 〇充電。 [0011] 〇 D 所述晶閘管50包括一陽極a、一陰極!(及一門極G。所述晶 閘管50之陽極A與所述電容組2〇之正極相連，陰極κ藉由 所述電流測量儀器60及一第一空氣開關Κ5連接至所述開 關電源70—端’所述開關電源7〇之另一端藉由一第二空 氣開關Κ6與所述電容組20之負極相連，所述第一空氣開 關Κ5及第二空氣開關Κ6為常閉開關，於電流過大時自動 斷開，以防燒壞電路中之其他元件。所述晶閘管5〇之門 極G與一第五電容C5之負極相連，所述第五電容C5之正極 藉由一驅動電路52連接至辦述晶閘管5#之陽極A、藉由一 截斷電路54連接至所述晶閘管50之陰極K °所述驅動電路 52包括一第三開關K31及一與該第三開關K31串聯之第三 電阻R3。所述截斷電路54包括一第四開關K32及一與該第 四開關Κ32串聯之第四電阻R4。所述第彡電阻R3之阻值遠 大於所述第四電阻R4之阻值，從而避免所述第二開關K31 導通瞬間產生過大之電流。所述晶閘管50之導通條件為 :其陽極A之電壓大於其陰極K之電壓炎真其門極G有正向 觸發電流。因此，當所述第三開關K31斷開，第四開關 K32閉合時，所述晶閘管50斷開；當所述第三開關1^1閉 099102183 表單編號A0101 第5頁/共15頁 0992004202-0 201126171 。第四開關K32斷開時，所述晶閘管5()導通。 [0012] [0013] 於本發明較佳實施方式中，所述第—開關及第二開關 K2均為繼電器開關’即於繼電器之線圈中有電流流過時 開關導通’沒有電流流過時開關斷開。所述第三開關⑶ 及第四開關K32為-第三繼電器開關^件之兩路開關（類 似於單刀雙擲繼電器開關之兩路），當第三繼電器開關 元件之線圈沒有電流藉由時，第四開關〇2閉合第三開 關Κ31斷開，當第二繼電器開關元件之線圈有電流藉由時 ，第二開關Κ31導通，第四開關Κ32斷開。 現結合圖3進一步說明所述浪湧電流測試電路中各開關元 件之工作原理，一開關控制電路由交流電源12供電，其 包括保險絲F3、F4、開關按鍵si、S2、S31、S32、及線 圈LI、L2、L3等元件，用以控制第一開關K1、第二開關 K2、第二開關K31及第四開關K32。所述開關按鍵S1用於 控制所述第一開關κι之斷開/閉合狀態，當開關按鍵31被 按下，所述線圈L1中有電流流過時，所述第一開關κ丨導 通。所述開關按鍵S2用於控制:所述第二開關Κ2之斷開/閉 合狀態，當開關按鍵S2被按下，所述線圈L2中有電流流 過時’所述第二開關Κ2導通。所述開關按鍵S31、S32用 於控制所述第三開關Κ31及第四開關Κ32之斷開/閉合狀態 ’當開關按鍵S31被按下，所述線圈L3中有電流流過時， 所述第三開關Κ31閉合，第四開關Κ32斷開。所述開關按 鍵S31被按下之同時，所述開關按鍵832自動斷開，兩者 之閉合/斷開狀態相反，以保證所述第三開關Κ31導通為 所述開關電源70供電時所述第一開關Κ1及第二開關Κ2均 099102183 表單編號Α0101 第6頁/共15頁 0992004202-0 201126171 斷開（即停止對電容組20充電、放電）。於所述開關控制 電路中，所述線圈L1與第二開關K2串接，線圈L2與第一 開關K1串接是為形成互鎖電路，防止所述第一開關K1及 第二開關K2同時導通。 [0014] 本測試分為三個階段：充電階段、測試階段及放電階段 〇 [0015] 於充電階段，按下所述開關按鍵S1，使開關K1閉合，K2 及K31斷開，此時所述輸出電源10開始對所述電容組20進 〇 行充電，所述放電電路30及晶閘管50均斷開停止工作， 所述電壓計40即時讀取所述電容組20兩端之電壓，直到 所述電容組20兩端之電壓值上升到測試所需電壓值（如 370V)時即停止對所述電容組20充電。 [0016] 於測試階段，按下所述開關按鍵S31，使所述第三開關 K31導通，與此同時所述開關按鍵S32斷開，使得所述線 圈LI、L2中無電流流過，所述第一開關K1及第二開關K2 斷開，從而停止對所述電容組2 0_充電、放電，此時所述 ❹ 電容組20作為瞬態電源（持續時間約為20微秒）對所述 開關電源70供電，所述電流測量儀器60測取輸入至所述 開關電源70之浪湧電流，以判斷所述浪湧電流是否於安 全之範圍之内。 [0017] 於放電階段，使開關按鍵S32閉合，與此同時所述開關按 鍵S31斷開，因而所述第三繼電器開關斷電（斷電時K31 斷開，K32閉合），使所述晶閘管50關斷，停止測試，然 後，按下開關按鍵S2，線圈L2中有電流流過，使所述第 099102183 表單編號A0101 第7頁/共15頁 0992004202-0 201126171 二開關K2閉合，所述放電電路30開始放電，直到所述電 容組20中殘餘之電能全部放完為止。 [0018] 於本發明較佳實施方式中，所述測試電路利用晶閘管50 取代傳統之接觸器開關，測試時晶閘管之導通不會產生 火花，使測試結果更為準確，且晶閘管相對於接觸器開 關，還具有體積小、無開關噪音及成本低等優點。 [0019] 綜上所述，本創作確已符合發明專利要求，爰依法提出 專利申請。惟，以上所述者僅為本創作之較佳實施例， 舉凡熟悉本創作技藝之人士，爰依本創作之精神所作之 等效修飾或變化，皆應涵蓋於以下之申請專利範圍内。 【圖式簡單說明】 [0020] 圖1為本發明較佳實施方式之浪湧電流測試電路之組成框 圖。 [0021] 圖2為本發明較佳實施方式之浪湧電流測試電路之具體電 路圖。 [0022] 圖3為一開關控制電路的示意圖。 【主要元件符號說明】 [0023] 輸出電源：1 0 [0024] 交流電源：12 [0025] 橋式整流電路：14 [0026] 電容組：20 [0027] 放電電路：3 0 099102183 表單編號Α0101 第8頁/共15頁 0992004202-0 201126171 [0028] 電壓計：40 [0029] 晶閘管：50 [0030] 電流測量儀器：6 0 [0031] 開關電源：70 [0032] 保險絲：F1、F 2、F 3、F 4 [0033] 第一電阻：R1 [0034] 〇 第二電阻：R2 [0035] 第三電阻：R3 . [0036] 第四電阻：R4 [0037] 第一開關：K1 [0038] 第二開關：K2 [0039] 第三開關：K31 [0040] 〇 第四開關：K32 [0041] 第一空氣開關：K5 [0042] 第二空氣開關：K6 [0043] 第一電容：C1 [0044] 第二電容：C2 [0045]' 第三電容：C3 [0046] 第四電容：C4 099102183 表單編號A0101 第9頁/共15頁 0992004202-0 201126171 [0047] 第五電容：C 5 [0048] 開關按鍵：SI、S2、S31、S32 [0049] 線圈：LI、L2、L3、L4 0992004202-0 099102183 表單編號A0101 第10頁/共15頁201126171 VI. Description of the invention: [Technical field to which the invention pertains] [(10) 1] The present invention relates to a test circuit, and more particularly to a surge current test circuit for a computer switching power supply. [Previous sputum]: [0002] The switching power supply of a computer is a converter that converts AC power into various low-voltage DC power supplies required for computer work. When the computer is turned on, the switching power supply will generate a sudden spike current, that is, a surge current. Excessive surge current will cause damage to the switching power supply components. To this end, computer manufacturers must detect the surge current of the switching power supply to ensure that the inrush current is within the safe range. [0003] For example, a surge current test circuit is used to test the surge of a power supply to be tested. The current includes an input AC power source, a bridge rectifier circuit connected to the AC power source, a capacitor group for providing a test voltage to the power source to be tested, and a connection between the capacitor group and the power source to be tested. The contactor switch (such as a relay switch), after the charging group is completed, the contactor switch is closed to supply power to the power to be tested. However, the contact of the contactor switch in the conventional test circuit is prone to oxidation due to long-term contact with the air, and abnormal spark interference often occurs when the switch is closed, so that the waveform of the measured current has many sharp burrs, resulting in inaccurate test results. SUMMARY OF THE INVENTION [0004] In view of the above, it is necessary to provide a surge current test circuit with a relatively accurate test result. [0005] A surge current test circuit for testing a surge current generated when a switching power supply is energized, the surge current test circuit including an output power source 099102183 Form No. A0101 Page 3 / Total 15 Page 0992004202-0 201126171 a capacitor group, a current measuring instrument, and a thyristor connected between the capacitor group and the switching power supply, wherein the output power source charges the capacitor group, and when the thyristor is turned on, the capacitor group is opposite The switching power supply is powered and the current meter measures the surge current. Compared with the conventional inrush current test circuit, the test circuit provided by the present invention replaces the conventional contactor switch with a thyristor, and the conduction of the thyristor does not generate a spark during the test, so that the test result is more accurate. [0007] Referring to FIG. 1, a surge current testing circuit according to a preferred embodiment of the present invention includes an output power supply 10, a capacitor bank 20, a discharge circuit 30, a voltmeter 40, a thyristor 50, and a current. Measuring instrument 60 and a switching power supply 70. The output power source 10 includes an AC power source 12 and a bridge rectifier circuit 14 connected to the AC power source 12. The inrush current test circuit is configured to test a surge current when the switching power supply 70 is energized. Referring to FIG. 2, the output terminals of the AC power source 12 are connected with fuses F1 and F2 for overcurrent protection. The output end of the output power source 10_ is connected to the anode of the capacitor group 20 via a first resistor R1 and a first switch K1, and the other output end of the output power source 10 and the capacitor bank 20 The negative pole is connected. The capacitor group 20 includes a first capacitor C1, a second capacitor C2, a third capacitor C3, and a fourth capacitor C4 connected in parallel, the first capacitor C1, the second capacitor C2, and the third capacitor C3. The fourth capacitor C4 is a polar capacitor (ie, a capacitor divided into a positive and a negative pole). When the first switch K1 is closed, the output power source 10 can charge the capacitor group 20 to gradually increase the voltage across the capacitor bank 20. [0009] The discharge circuit 30 is connected to the capacitor group 20, and the discharge circuit 30 099102183 Form No. A0101 Page 4 of 15 091 201126171 [0010] includes a second switch K2 and a second resistor R2 The second switch (four) is connected to the second electric switch. The second off (four) can be combined to discharge the stored electrical energy of the capacitor bank 20. The voltmeter 40 is connected in parallel with the capacitor _ and the ohmic electric paste to measure the voltage across the capacitor group 20, and when the voltage across the capacitor group 2Q rises to the voltage value required for testing (eg, 3 m) The first switch K1 should be disconnected to stop charging the capacitor bank 2 . [0011] 〇D The thyristor 50 includes an anode a, a cathode! (and a gate G. The anode A of the thyristor 50 is connected to the anode of the capacitor group 2〇, and the cathode κ is used by the current measuring instrument 60 and a first air switch Κ5 connected to the switching power supply 70-terminal 'the other end of the switching power supply 7〇 is connected to the negative pole of the capacitor group 20 by a second air switch Κ6, the first air The switch Κ5 and the second air switch Κ6 are normally closed switches, and are automatically disconnected when the current is too large to prevent burning of other components in the circuit. The gate G of the thyristor 5 is connected to the negative pole of a fifth capacitor C5. The anode of the fifth capacitor C5 is connected to the anode A of the thyristor 5# via a driving circuit 52, and connected to the cathode K of the thyristor 50 by a blocking circuit 54. The driving circuit 52 includes a third The switch K31 and a third resistor R3 connected in series with the third switch K31. The cutoff circuit 54 includes a fourth switch K32 and a fourth resistor R4 connected in series with the fourth switch Κ32. The second resistor R3 The resistance is much larger than the resistance of the fourth resistor R4, thereby avoiding The second switch K31 is turned on to generate an excessive current instantaneously. The conduction condition of the thyristor 50 is that the voltage of the anode A is greater than the voltage of the cathode K, and the gate G thereof has a positive trigger current. Therefore, when The third switch K31 is turned off, and when the fourth switch K32 is closed, the thyristor 50 is turned off; when the third switch 1^1 is closed 099102183, the form number A0101 is 5th page/total 15 page 0992004202-0 201126171. When the K32 is turned off, the thyristor 5 () is turned on. [0013] In the preferred embodiment of the present invention, the first switch and the second switch K2 are relay switches, that is, in the coil of the relay. When the current flows, the switch is turned on. 'The switch is turned off when no current flows. The third switch (3) and the fourth switch K32 are the two switches of the third relay switch (similar to the two paths of the single-pole double-throw relay switch). When the coil of the third relay switching element has no current, the fourth switch 〇2 is closed, and the third switch Κ31 is turned off. When the coil of the second relay switching element has current, the second switch Κ31 is turned on, and the fourth switch is turned on. Κ32 disconnected. The working principle of each switching element in the surge current testing circuit will be further described with reference to FIG. 3. A switching control circuit is powered by an AC power source 12, which includes fuses F3, F4, switch buttons si, S2, S31, S32, and coils. The components of LI, L2, L3, etc. are used to control the first switch K1, the second switch K2, the second switch K31, and the fourth switch K32. The switch button S1 is used to control the opening/closing of the first switch κι In the state, when the switch button 31 is pressed and a current flows in the coil L1, the first switch κ 丨 is turned on. The switch button S2 is used to control the open/closed state of the second switch Κ2. When the switch button S2 is pressed and a current flows in the coil L2, the second switch Κ2 is turned on. The switch buttons S31, S32 are used to control the open/close state of the third switch Κ31 and the fourth switch '32. When the switch button S31 is pressed, when a current flows in the coil L3, the third The switch Κ 31 is closed and the fourth switch Κ 32 is opened. When the switch button S31 is pressed, the switch button 832 is automatically turned off, and the closed/disconnected states of the two are reversed to ensure that the third switch Κ31 is turned on to supply power to the switching power supply 70. One switch Κ1 and the second switch Κ2 are both 099102183 Form No. 1010101 Page 6/Total 15 Page 0992004202-0 201126171 Disconnect (ie stop charging and discharging capacitor group 20). In the switch control circuit, the coil L1 and the second switch K2 are connected in series, and the coil L2 is connected in series with the first switch K1 to form an interlock circuit to prevent the first switch K1 and the second switch K2 from being simultaneously turned on. . [0014] The test is divided into three phases: a charging phase, a testing phase, and a discharging phase. [0015] In the charging phase, the switch button S1 is pressed to close the switch K1, and K2 and K31 are disconnected. The output power source 10 begins to charge the capacitor group 20, and the discharge circuit 30 and the thyristor 50 are both turned off and stopped, and the voltmeter 40 instantly reads the voltage across the capacitor group 20 until the When the voltage value across the capacitor bank 20 rises to the voltage value required for testing (eg, 370V), charging of the capacitor bank 20 is stopped. [0016] In the test phase, the switch button S31 is pressed to turn on the third switch K31, and at the same time, the switch button S32 is turned off, so that no current flows in the coils L1, L2. The first switch K1 and the second switch K2 are turned off, thereby stopping charging and discharging the capacitor group 20 0. At this time, the capacitor group 20 is used as a transient power source (duration is about 20 microseconds) The switching power supply 70 supplies power, and the current measuring instrument 60 measures the inrush current input to the switching power supply 70 to determine whether the surge current is within a safe range. [0017] In the discharging phase, the switch button S32 is closed, and at the same time, the switch button S31 is turned off, so that the third relay switch is powered off (K31 is turned off when the power is off, K32 is closed), and the thyristor 50 is turned on. Turn off, stop the test, and then press the switch button S2, a current flows in the coil L2, so that the 099102183 form number A0101 page 7 / a total of 15 pages 0992004202-0 201126171 two switches K2 closed, the discharge circuit 30 begins to discharge until the remaining electrical energy in the capacitor bank 20 is completely discharged. In the preferred embodiment of the present invention, the test circuit uses a thyristor 50 instead of a conventional contactor switch, and the conduction of the thyristor does not generate a spark during the test, so that the test result is more accurate, and the thyristor is opposite to the contactor switch. It also has the advantages of small size, no switching noise and low cost. [0019] In summary, the creation has indeed met the requirements of the invention patent, and the patent application is filed according to law. However, the above description is only a preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art of the present invention should be included in the following claims. BRIEF DESCRIPTION OF THE DRAWINGS [0020] FIG. 1 is a block diagram of a surge current test circuit according to a preferred embodiment of the present invention. 2 is a specific circuit diagram of a surge current test circuit according to a preferred embodiment of the present invention. 3 is a schematic diagram of a switch control circuit. [Main component symbol description] [0023] Output power supply: 1 0 [0024] AC power supply: 12 [0025] Bridge rectifier circuit: 14 [0026] Capacitor bank: 20 [0027] Discharge circuit: 3 0 099102183 Form number Α 0101 8 pages/total 15 pages 0992004202-0 201126171 [0028] Voltmeter: 40 [0029] Thyristor: 50 [0030] Current measuring instrument: 6 0 [0031] Switching power supply: 70 [0032] Fuse: F1, F 2, F 3. F 4 [0033] First resistor: R1 [0034] 〇 second resistor: R2 [0035] third resistor: R3. [0036] fourth resistor: R4 [0037] first switch: K1 [0038] Second switch: K2 [0039] Third switch: K31 [0040] 〇 Fourth switch: K32 [0041] First air switch: K5 [0042] Second air switch: K6 [0043] First capacitor: C1 [0044] Second capacitor: C2 [0045] ' Third capacitor: C3 [0046] Fourth capacitor: C4 099102183 Form number A0101 Page 9 / Total 15 page 0992004202-0 201126171 [0047] Fifth capacitor: C 5 [0048] Switch Buttons: SI, S2, S31, S32 [0049] Coils: LI, L2, L3, L4 0992004202-0 099102183 Form No. A0101 Page 10 of 15