TWI414801B - Current detection circuit - Google Patents
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- TWI414801B TWI414801B TW098138008A TW98138008A TWI414801B TW I414801 B TWI414801 B TW I414801B TW 098138008 A TW098138008 A TW 098138008A TW 98138008 A TW98138008 A TW 98138008A TW I414801 B TWI414801 B TW I414801B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
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Abstract
Description
本發明係一種關於檢出流通於電源等電路中之電流的電流檢測電路。The present invention is a current detecting circuit for detecting a current flowing in a circuit such as a power source.
第九、十圖係為習知電流檢測電路之相關說明。第九圖係為電源電路與用來檢測流經該電源電路之電流的電流檢測電路之結構示意圖。第十圖係為電流檢測電路所使用之差動電壓電路的電路結構示意圖。The ninth and tenth drawings are related descriptions of conventional current detecting circuits. The ninth diagram is a schematic diagram of a power supply circuit and a current detecting circuit for detecting a current flowing through the power supply circuit. The tenth diagram is a schematic diagram of the circuit structure of the differential voltage circuit used in the current detecting circuit.
第九圖中,電源電路100係由開關SW、二極管D、電阻器R、線圈L、集電器C所組成,開關SW的一端連接到直流電源Vcc另一端則連接到二極管D的陰極端子。二極管D的陽極端子連接到電阻R的其中一端,電阻R的另一端則接地。二極管D與電阻R之連接點與節點A連接。電阻R的電阻設為r,節點A連接到電流檢測電路300,線圈L的一端連接到二極管D的陰極端子,另一端則連接到輸出端子OUT與集電器C的一端。集電器C的另一端則接地。In the ninth diagram, the power supply circuit 100 is composed of a switch SW, a diode D, a resistor R, a coil L, and a current collector C. One end of the switch SW is connected to the DC power supply Vcc and the other end is connected to the cathode terminal of the diode D. The anode terminal of the diode D is connected to one end of the resistor R, and the other end of the resistor R is grounded. The connection point of the diode D and the resistor R is connected to the node A. The resistance of the resistor R is set to r, the node A is connected to the current detecting circuit 300, one end of the coil L is connected to the cathode terminal of the diode D, and the other end is connected to one end of the output terminal OUT and the current collector C. The other end of the current collector C is grounded.
電源電路100在開關SW為ON狀態時,直流電源Vcc所供給之直流電壓透過線圈L與集電器C以規定的電源電壓對連接於輸出端子OUT的電力機器(負荷)作供給。此外在電源電路100中,二極管D與電阻R配置成一個可避免在開關SW切換到ON時,造成急遽的外施電壓(applied voltage)流向負荷側的過電流保護電路101A。例如連接於輸出端子OUT的負荷側發生短路時,過電流(負電流)IO即如第九圖所示流向過電流保護電路,此時回應該過電流量之負電壓將被輸入到連接於節點A的電流檢測電路300。電流檢測電路300備有一差分電路301,其非反相輸入端子(+)連接到節點A,反相輸入端子(-)則接地,輸出端子則連接到節點B。差動電壓電路301在非反像輸入端子(+)與反相輸入端子(-)之接地電位的電位差超過規定等級時會向節點B輸出電流檢測信號,也就是將差動電壓電路301作為比較電路來使用。In the power supply circuit 100, when the switch SW is in the ON state, the DC voltage supplied from the DC power supply Vcc is supplied to the power supply (load) connected to the output terminal OUT by the predetermined power supply voltage through the coil L and the current collector C. Further, in the power supply circuit 100, the diode D and the resistor R are arranged in an overcurrent protection circuit 101A which can prevent a sudden applied voltage from flowing to the load side when the switch SW is switched ON. For example, when a short circuit is generated on the load side connected to the output terminal OUT, the overcurrent (negative current) IO flows to the overcurrent protection circuit as shown in FIG. 9, and the negative voltage corresponding to the overcurrent amount is input to the node connected to the node. A current detecting circuit 300 of A. The current detecting circuit 300 is provided with a differential circuit 301 whose non-inverting input terminal (+) is connected to the node A, the inverting input terminal (-) is grounded, and the output terminal is connected to the node B. The differential voltage circuit 301 outputs a current detection signal to the node B when the potential difference between the ground potential of the non-reverse input terminal (+) and the inverting input terminal (-) exceeds a predetermined level, that is, the differential voltage circuit 301 is compared. The circuit is used.
差動電壓電路301的電路組成如第十圖所示。在第十圖中,差動電壓電路301係由第1電流源I1,第2電流源I2,PMOS電晶體(transistor)TR1~TR3,NMOS電晶體TR4、TR5所組成。第1電流源I1同時連接於PMOS電晶體TR1的源極端子以及PMOS電晶體TR2的閘極端子。PMOS電晶體TR1的閘極端子連接到非反相輸入端子(+),汲極端子則接地。第2電流源I2連接到PMOS電晶體TR2、TR3的各源極端子,PMOS電晶體TR2的汲極端子連接到NMOS電晶體TR4的源極端子。PMOS電晶體TR3的閘極端子連接到反相輸入端子(-),汲極端子則連接到NMOS電晶體TR5的源極端子以及輸出端子OUT。NMOS電晶體TR4的閘極端子連接到NMOS電晶體TR5的閘極端子,汲極端子則接地。NMOS電晶體TR5的汲極端子為接地。The circuit composition of the differential voltage circuit 301 is as shown in the tenth diagram. In the tenth diagram, the differential voltage circuit 301 is composed of a first current source I1, a second current source I2, PMOS transistors (TR1 to TR3), and NMOS transistors TR4 and TR5. The first current source I1 is simultaneously connected to the source terminal of the PMOS transistor TR1 and the gate terminal of the PMOS transistor TR2. The gate terminal of the PMOS transistor TR1 is connected to the non-inverting input terminal (+), and the gate terminal is grounded. The second current source I2 is connected to the respective source terminals of the PMOS transistors TR2, TR3, and the NMOS terminal of the PMOS transistor TR2 is connected to the source terminal of the NMOS transistor TR4. The gate terminal of the PMOS transistor TR3 is connected to the inverting input terminal (-), and the gate terminal is connected to the source terminal of the NMOS transistor TR5 and the output terminal OUT. The gate terminal of the NMOS transistor TR4 is connected to the gate terminal of the NMOS transistor TR5, and the gate terminal is grounded. The NMOS terminal of the NMOS transistor TR5 is grounded.
PMOS電晶體TR1係藉由對輸入上述非反相輸入端子(+)的過電流量產生回應的負電壓而開啟(ON),並將對應第1電流源I1所供給之定電流的分壓電壓(正電壓)輸入PMOS電晶體TR2的閘極端子。PMOS電晶體TR1與第1電源流I1將輸入非反相輸入端子(+)的負電壓作為正電壓輸入PMOS電晶體R2的閘極端子而配置成正電壓輸入電路301A。The PMOS transistor TR1 is turned on (ON) by a negative voltage that responds to an overcurrent amount input to the non-inverting input terminal (+), and a divided voltage corresponding to a constant current supplied from the first current source I1. (Positive voltage) is input to the gate terminal of the PMOS transistor TR2. The PMOS transistor TR1 and the first power supply stream I1 are arranged as a positive voltage input circuit 301A by inputting a negative voltage input to the non-inverting input terminal (+) as a positive voltage to the gate terminal of the PMOS transistor R2.
PMOS電晶體TR2、TR3與NMOS電晶體TR4、TR5構成差動電壓電路部301B。此一差動電壓電路部301B會回應來自上述正電壓輸入電路301A所輸入的正電壓與反相輸入端子(-)的接地電位之間的電壓差而運作,從輸出端子OUT輸出電流檢測信號作為電壓信號。也就是說當PMOS電晶體TR1因輸入正電壓輸入電路301A的負電壓而開啟(ON),正電壓超越閾值Vth時PMOS電晶體TR2開啟(ON),且正電壓與反相輸入端子(-)的接地電位的電壓差擴大至超過所定範圍而開始運作時,差動電壓電路部301B就會從輸出端子OUT輸出電流檢測信號Id作為電壓信號。The PMOS transistors TR2 and TR3 and the NMOS transistors TR4 and TR5 constitute a differential voltage circuit unit 301B. The differential voltage circuit unit 301B operates in response to a voltage difference between the positive voltage input from the positive voltage input circuit 301A and the ground potential of the inverting input terminal (-), and outputs a current detection signal from the output terminal OUT as Voltage signal. That is, when the PMOS transistor TR1 is turned on (ON) by the input of the negative voltage of the positive voltage input circuit 301A, the PMOS transistor TR2 is turned ON when the positive voltage exceeds the threshold Vth, and the positive voltage and the inverting input terminal (-) When the voltage difference of the ground potential is increased beyond the predetermined range and the operation is started, the differential voltage circuit unit 301B outputs the current detection signal Id as a voltage signal from the output terminal OUT.
此外,特許文獻:特開2005-229563號公報中便記載了一種習知用於檢測電源等電路中運作的方法。在這個電源電壓監視電路中,對於功率放大器在電源開啟(ON)或關閉(OFF)時所提供的正負電源電壓進行監視,當檢測出異常時就強制關閉開關電路以防止在異常外施電壓下的運作。Further, a method for detecting the operation in a circuit such as a power source is described in Japanese Laid-Open Patent Publication No. 2005-229563. In this power supply voltage monitoring circuit, the positive and negative power supply voltages supplied by the power amplifier when the power is turned on (ON) or turned off (OFF) are monitored, and when an abnormality is detected, the switching circuit is forcibly turned off to prevent abnormal applied voltage. Operation.
如第九圖所示,在電流檢測電路300中作為負荷電流的過電流I0 流經時,節點A會產生負電壓,故需要如第十圖所示之差動電壓電路301中用來輸入對應過電流量的正電壓之正電壓輸入電路。例如電源電路100內的電阻器R的電阻值為10mΩ,當-10A的過電流(負電流)I0 流經時節點A的電位就變成-100mV。也就是說當過電流I0 流經電源電路100內部時,會因電阻器R而產生負電壓,此一負電壓便構成從節點A輸入差動電壓電路301的非反相輸入端子(+)的電路。因此要使差動電壓電路301正常運作,就需要具有如第十圖所示之電路配置的正電壓輸入電路301A。此一電路配置會使差動電壓電路301內部的電路配置複雜化,並增加電流檢測電路的成本。另外正電壓輸入電路301A為了擴大可輸入差動電壓電路部301B之正電壓的範圍,差動電壓電路部301B配置內的MOS電晶體TR2~TR5,為因應運作電壓的擴大也必須跟著擴大電路模式,電路面積也跟著增大。As shown in the ninth figure, when the overcurrent I 0 as the load current flows through the current detecting circuit 300, the node A generates a negative voltage, so that it is required to be input in the differential voltage circuit 301 as shown in the tenth diagram. A positive voltage input circuit corresponding to a positive voltage of an overcurrent amount. For example, the resistance value of the resistor R in the power supply circuit 100 is 10 mΩ, and the potential of the node A becomes -100 mV when the overcurrent (negative current) I 0 of -10 A flows. That is to say, when the overcurrent I 0 flows through the inside of the power supply circuit 100, a negative voltage is generated due to the resistor R, and this negative voltage constitutes a non-inverting input terminal (+) input from the node A to the differential voltage circuit 301. Circuit. Therefore, in order for the differential voltage circuit 301 to operate normally, a positive voltage input circuit 301A having a circuit configuration as shown in the tenth embodiment is required. This circuit configuration complicates the circuit configuration inside the differential voltage circuit 301 and increases the cost of the current detecting circuit. Further, in order to increase the range of the positive voltage input to the differential voltage circuit unit 301B, the positive voltage input circuit 301A is disposed in the differential voltage circuit unit 301B, and the MOS transistors TR2 to TR5 in the differential voltage circuit unit 301B are required to expand the circuit mode in response to the expansion of the operating voltage. The circuit area also increases.
有鑑於上述課題,本發明之目的在於提供一種不需將差動電壓電路內的電路配置複雜化,亦不需擴大電路面積,即能確實檢測出流經負荷的過電流的電流檢測電路。In view of the above problems, it is an object of the present invention to provide a current detecting circuit that can accurately detect an overcurrent flowing through a load without complicating the circuit arrangement in the differential voltage circuit and without enlarging the circuit area.
本發明的實施例之一的電流檢測電路之特徵在於,其係連接到作為電流檢測對象之電路的電流檢測節點上,並具有一個可比較以流經上述電路的負電流作為正電壓輸出的輸入電路與從上述電路輸出的正電壓及基準電壓,並將其比較結果作為電流檢測信號輸出的差動電壓電路。A current detecting circuit according to an embodiment of the present invention is characterized in that it is connected to a current detecting node of a circuit as a current detecting object, and has an input which can be compared to a negative current flowing through the above circuit as a positive voltage output. The circuit and the positive voltage and the reference voltage output from the above circuit, and the comparison result thereof is used as a differential voltage circuit for outputting the current detection signal.
本發明係可提供一種不需將差動電壓電路內的電路配置複雜化,亦不需擴大電路面積,即能確實檢測出流經負荷的過電流的電流檢測電路。The present invention can provide a current detecting circuit that does not need to complicate the circuit configuration in the differential voltage circuit, and does not need to enlarge the circuit area, that is, can reliably detect an overcurrent flowing through the load.
以下將參照圖式並詳細說明關於本發明之電流檢測電路的一種實施例。本實施例中顯示的電流檢測電路係用來檢測作為負荷流經電源電路的過電流,然而電流檢測電路可適用的負荷並不限於電源電路。An embodiment of the current detecting circuit of the present invention will be described in detail below with reference to the drawings. The current detecting circuit shown in this embodiment is for detecting an overcurrent flowing as a load through the power supply circuit, but the load to which the current detecting circuit can be applied is not limited to the power supply circuit.
第一圖係顯示一種連接到本第1實施例中的電源電路(負荷電路)100的電流檢測電路200的概略配置圖。此外,因第一圖所示之電源電路100與第九圖所示之電源電路100為同一電路配置,僅註記為同一符號並省略配置說明。The first diagram shows a schematic configuration diagram of a current detecting circuit 200 connected to the power supply circuit (load circuit) 100 in the first embodiment. In addition, the power supply circuit 100 shown in the first figure is the same circuit configuration as the power supply circuit 100 shown in the ninth figure, and only the same reference numerals will be given, and the description of the arrangement will be omitted.
第一圖中,電流檢測電路200係由輸入電路201與差動電壓電路202所構成。輸入電路201的輸入部連接到電源電路100的電流檢測節點A,輸出部藉由節點C連接到差動電壓電路202。輸入電路201係將流經電流檢測節點A的負電流I0 作為正電壓輸出到節點C。差動電壓電路202係將輸入電路201所輸出的正電壓與後述的基準電壓作比較,其比較結果則當作電流檢測信號Id 從節點B輸出。In the first figure, the current detecting circuit 200 is composed of an input circuit 201 and a differential voltage circuit 202. The input portion of the input circuit 201 is connected to the current detecting node A of the power supply circuit 100, and the output portion is connected to the differential voltage circuit 202 by the node C. The input circuit 201 outputs the negative current I 0 flowing through the current detecting node A as a positive voltage to the node C. The differential input voltage reference circuit 202 based voltage of the positive voltage and a later-described output circuit 201 for comparison, a comparison result output current detection signal d is as I B from the node.
第二圖係第一圖所示之輸入電路201與差動電壓電路202的電路配置圖之一例示意圖。第二圖中電流檢測電路200係由第1定電壓源V1、第2定電壓源V2、輸入電路201、差動電壓電路202所構成。第1定電壓源V1產生第1基準電壓VR1,第2定電壓源V2則產生第2基準電壓VR2。The second figure is a schematic diagram showing an example of a circuit configuration diagram of the input circuit 201 and the differential voltage circuit 202 shown in the first figure. In the second diagram, the current detecting circuit 200 is composed of a first constant voltage source V1, a second constant voltage source V2, an input circuit 201, and a differential voltage circuit 202. The first constant voltage source V1 generates the first reference voltage VR1, and the second constant voltage source V2 generates the second reference voltage VR2.
第二圖中,輸入電路201係由電阻器R1、R2所構成。抵抗器R1(第1電阻器)的一端部(第1端部)連接到電流檢測節點A、另一端部(第2端部)連接到電阻器R2的一端以及差動電壓電路202的非反相輸入端子(+)(第1輸入端子)。電阻器R2(第2電阻器)的一端部(第1端部)連接到電阻器R1的另一端部以及非反相輸入端子(+)(第1輸入端子),另一端部(第2端部)則連接到第2定電壓源V2。此外,電阻器R1的電阻值設為r1,電阻器R2的電阻值設為r2。第二圖中以電阻器R1、R2的連接點作為節點C,此一輸入電路201係構成一個將流經上述過電流保護電路101A的負電流I0 與藉電阻器R在電流檢測節點A產生的負電壓rI0 ,以及第2定電壓源V2的第2基準電壓VR2的電壓差,進行分壓後作為正電壓輸出的分壓電路。In the second figure, the input circuit 201 is composed of resistors R1 and R2. One end portion (first end portion) of the resistor R1 (first resistor) is connected to the current detecting node A, the other end portion (second end portion) is connected to one end of the resistor R2, and the non-reverse of the differential voltage circuit 202 Phase input terminal (+) (first input terminal). One end portion (first end portion) of the resistor R2 (second resistor) is connected to the other end portion of the resistor R1 and the non-inverting input terminal (+) (first input terminal), and the other end portion (second end portion) The part is connected to the second constant voltage source V2. Further, the resistance value of the resistor R1 is set to r1, and the resistance value of the resistor R2 is set to r2. In the second figure, the connection point of the resistors R1 and R2 is taken as the node C. The input circuit 201 constitutes a negative current I 0 flowing through the overcurrent protection circuit 101A and the resistor R is generated at the current detecting node A. The voltage difference between the negative voltage rI 0 and the second reference voltage VR2 of the second constant voltage source V2 is a voltage dividing circuit that is divided and output as a positive voltage.
在第二圖中,差動電壓電路202係由運算放大器所構成。此一運算放大器的反相輸入端子(-)(第2輸入端子)係連接到第1定電壓源V1。差動電壓電路202係將從輸入電路201輸入到非反相輸入端子(+)的正電壓與從第1定電壓源V1輸入到反相輸入端子(-)的第1基準電壓VR1作比較後,將其比較結果作為電流檢測信號Id 輸出到節點B。In the second figure, the differential voltage circuit 202 is constructed by an operational amplifier. The inverting input terminal (-) (second input terminal) of this operational amplifier is connected to the first constant voltage source V1. The differential voltage circuit 202 compares the positive voltage input from the input circuit 201 to the non-inverting input terminal (+) with the first reference voltage VR1 input from the first constant voltage source V1 to the inverting input terminal (-). The comparison result is output as a current detection signal I d to the node B.
第三圖係為第二圖所示之差動電壓電路202內的電路配置示意圖。第三圖中與第九圖所示之差動電壓電路部301B內的構成部分相同的部分皆附上相同符號。第三圖中差動電壓電路202係由第2電流源I2、PMOS電晶體TR2、TR3,NMOS電晶體TR4、TR5所構成。The third figure is a schematic diagram of the circuit configuration in the differential voltage circuit 202 shown in the second figure. In the third embodiment, the same portions as those in the differential voltage circuit portion 301B shown in the ninth diagram are denoted by the same reference numerals. In the third diagram, the differential voltage circuit 202 is composed of a second current source I2, PMOS transistors TR2 and TR3, and NMOS transistors TR4 and TR5.
第2電流源I2係共通連接到PMOS電晶體TR2、TR3的各源極端子。PMOS電晶體TR2連接到閘極端子的非反相輸入端子(+)(節點C),汲極端子則連接到NMOS電晶體TR4的源極端子。PMOS電晶體TR3連接到閘極端子的反相輸入端子(-),汲極端子則連接到NMOS電晶體TR5的源極端子與輸出端子OUTPUT。PMOS電晶體TR4的閘極端子連接到NMOS電晶體TR5的閘極端子,汲極端子則接地。NMOS電晶體TR5的汲極端子為接地。The second current source I2 is commonly connected to the respective source terminals of the PMOS transistors TR2, TR3. The PMOS transistor TR2 is connected to the non-inverting input terminal (+) (node C) of the gate terminal, and the 汲 terminal is connected to the source terminal of the NMOS transistor TR4. The PMOS transistor TR3 is connected to the inverting input terminal (-) of the gate terminal, and the drain terminal is connected to the source terminal of the NMOS transistor TR5 and the output terminal OUTPUT. The gate terminal of the PMOS transistor TR4 is connected to the gate terminal of the NMOS transistor TR5, and the gate terminal is grounded. The NMOS terminal of the NMOS transistor TR5 is grounded.
接著在第二圖所示之輸入電路201中,從節點C產生正電壓的條件請參照第四圖說明。第四圖係將流經輸入電路201內各部的電流設為I1 ~I3 ,從輸入電路201兩端部外施的電壓設為VR2-rI0 之示意圖。以下將根據本圖說明將節點C的電壓Vc變成正電壓的條件。Next, in the input circuit 201 shown in the second figure, the condition for generating a positive voltage from the node C will be described with reference to the fourth figure. In the fourth diagram, the current flowing through each portion of the input circuit 201 is set to I 1 to I 3 , and the voltage applied from both ends of the input circuit 201 is assumed to be VR2-rI 0 . The condition for changing the voltage Vc of the node C to a positive voltage will be described below based on this figure.
如第四圖所示,以流經電阻器R1的電流為I1 、電阻器R2的電流為I2 ,流經節點C的電流為I3 時,節點C的電壓Vc可用以下的公式(1)表示。As shown in the fourth figure, when the current flowing through the resistor R1 is I 1 , the current of the resistor R2 is I 2 , and the current flowing through the node C is I 3 , the voltage Vc of the node C can be expressed by the following formula (1) ) said.
Vc=VR2-I2 ‧r2‧‧‧(1)Vc=VR2-I 2 ‧r2‧‧‧(1)
電流為I1 可用以下的公式(2)表示。The current I 1 can be expressed by the following formula (2).
I1 =(Vc-r‧I0 )/r1‧‧‧(2)I 1 =(Vc-r‧I 0 )/r1‧‧‧(2)
電流為I1 可用以下的公式(3)表示。The current I 1 can be expressed by the following formula (3).
I1 =I2 +I3 ‧‧‧(3)I 1 =I 2 +I 3 ‧‧‧(3)
此時因I3 =0,變成I1 =I2 ,At this time, since I 3 =0, it becomes I 1 =I 2 .
I1 =I2 =(VR2-Vc)/r2‧‧‧(4)I 1 =I 2 =(VR2-Vc)/r2‧‧‧(4)
若套用此數學式(2),電壓Vc可用以下的公式(5)表示。If this mathematical formula (2) is applied, the voltage Vc can be expressed by the following formula (5).
Vc={r1(VR2-Vc)/r2}+r‧I0 ‧‧‧(5)Vc={r1(VR2-Vc)/r2}+r‧I 0 ‧‧‧(5)
這個公式(5)可用以下的公式(6)表示。This formula (5) can be expressed by the following formula (6).
r2‧Vc=r1‧VR2-r1‧Vc+r‧r2‧I0 ‧‧‧(6)r2‧Vc=r1‧VR2-r1‧Vc+r‧r2‧I 0 ‧‧‧(6)
這個公式(6)又可用以下的公式(7)表示。This formula (6) can be expressed by the following formula (7).
(r1+r2)Vc=r1‧VR2+r‧r2‧I0 ‧‧‧(7)(r1+r2)Vc=r1‧VR2+r‧r2‧I 0 ‧‧‧(7)
利用這個公式(7)求電壓Vc的話可用以下的公式(8)表示。The voltage Vc obtained by using this equation (7) can be expressed by the following formula (8).
Vc=(r1‧VR2+r‧r2‧I0 )/(r1+r2)‧‧‧(8) Vc = (r1‧VR2 + r‧r2‧I 0) / (r1 + r2) ‧‧‧ (8)
因此節點C的電壓Vc可用電阻器R1、R2的各電阻值r1、r2以及第2定電壓源V2的第2基準電壓VR2來表示。Therefore, the voltage Vc of the node C can be expressed by the respective resistance values r1 and r2 of the resistors R1 and R2 and the second reference voltage VR2 of the second constant voltage source V2.
在第1實施例中係將電阻器R1、R2的各電阻值r1、r2,以及第2定電壓源V2的第2基準電壓VR2設定為使公式(8)所示之電壓Vc可成為正電壓(Vc>0)之值。另外在第1實施例中,將第1定電壓源V1的第1基準電壓VR1與第2定電壓源V2的第2基準電壓VR2的關係設定為VR1<VR2。In the first embodiment, the respective resistance values r1 and r2 of the resistors R1 and R2 and the second reference voltage VR2 of the second constant voltage source V2 are set such that the voltage Vc shown in the formula (8) becomes a positive voltage. The value of (Vc>0). In the first embodiment, the relationship between the first reference voltage VR1 of the first constant voltage source V1 and the second reference voltage VR2 of the second constant voltage source V2 is set to VR1 < VR2.
在第二圖中,第1定電壓源V1的第1基準電壓VR1設為0.65V、第2定電壓源V2的第2基準電壓VR2設為1.2V,輸入電路201的電組器R1、R2的各電阻值為r1、r2設為10kΩ電源電路100的電組器R的電阻值r設為10Mω,流經過電流保護電路101A的過電流(負電流)I0 設為-10A,此一狀況下節點A的電壓就變成I0 ‧r=10-2 ×(-10)=-100mV,節點C的電壓可從上記公式(8)求出。此時r1=r2,In the second diagram, the first reference voltage VR1 of the first constant voltage source V1 is set to 0.65 V, and the second reference voltage VR2 of the second constant voltage source V2 is set to 1.2 V, and the electric groupers R1 and R2 of the input circuit 201 are set. Each of the resistance values is r1 and r2 is set to 10 kΩ. The resistance value r of the power pack R of the power supply circuit 100 is set to 10 Mω, and the overcurrent (negative current) I 0 flowing through the current protection circuit 101A is set to -10 A. The voltage of the lower node A becomes I 0 ‧ r = 10 - 2 × (-10) = -100 mV, and the voltage of the node C can be obtained from the above formula (8). At this time r1=r2,
Vc=(r1‧VR2+r‧r2‧I0 )/(r1+r2)=(1.1×104 )/(2×104 )=1.1/2=0.55VVc=(r1‧VR2+r‧r2‧I 0 )/(r1+r2)=(1.1×10 4 )/(2×10 4 )=1.1/2=0.55V
如上記所述,藉由連接到輸入電路201。節點C會產生對應過電流I0 的正電壓,該對應過電流I0 的正電壓會輸入到差動電壓電路202的非反相輸入端子(+)。因此第二圖所示之差動電壓電路202,就不需要正電壓輸入電路301A,可使電路配置簡略化且變得容易設計。由於連接輸入電路201的緣故,對應過電流量而輸入到差動電壓電路202的負荷電壓的電壓範圍便縮小。因此不需擴大構成差動電壓電路202的MOS電晶體TR2~TR5的工作電壓,亦不需擴大電路圖樣(circuit pattern),結果就是抑制了電流檢測電路200的成本。As described above, it is connected to the input circuit 201. The node C generates a positive voltage corresponding to the overcurrent I 0 , and the positive voltage corresponding to the overcurrent I 0 is input to the non-inverting input terminal (+) of the differential voltage circuit 202. Therefore, the differential voltage circuit 202 shown in the second figure does not require the positive voltage input circuit 301A, and the circuit configuration can be simplified and made easy to design. Due to the connection of the input circuit 201, the voltage range of the load voltage input to the differential voltage circuit 202 corresponding to the amount of overcurrent is reduced. Therefore, it is not necessary to enlarge the operating voltages of the MOS transistors TR2 to TR5 constituting the differential voltage circuit 202, and it is not necessary to enlarge the circuit pattern, with the result that the cost of the current detecting circuit 200 is suppressed.
第1實施例中的差動電壓電路202的工作電壓可減低至小於第四圖所示之差動電壓電路300的工作電壓,既可使電路圖樣獲得縮小,又可追求電流檢測電路200的成本降低。而第1實施例中的差動電壓電路202僅需追加電阻器R1、R2作為輸入電路201。因此比起正電壓輸入電路301A不僅電路配置單純化,電流檢測電路200的成本增加也獲得抑制。而本實施例中的差動電壓電路202,雖有連接第1定電壓源V1與第2定電壓源V2,但這些定電壓源又可利用連接到差動電壓電路202的電源(圖中未表示),故成本的增加亦可獲得抑制。The operating voltage of the differential voltage circuit 202 in the first embodiment can be reduced to be smaller than the operating voltage of the differential voltage circuit 300 shown in the fourth figure, so that the circuit pattern can be reduced and the cost of the current detecting circuit 200 can be pursued. reduce. On the other hand, the differential voltage circuit 202 of the first embodiment only needs to add the resistors R1 and R2 as the input circuit 201. Therefore, not only the circuit configuration is simplistic, but also the cost increase of the current detecting circuit 200 is suppressed as compared with the positive voltage input circuit 301A. In the differential voltage circuit 202 of this embodiment, although the first constant voltage source V1 and the second constant voltage source V2 are connected, the constant voltage source can use the power source connected to the differential voltage circuit 202 (not shown). Therefore, the increase in cost can also be suppressed.
藉由讓第1實施例的電流檢測電路200適用於電源電路100等的負荷,而可確實檢測出流經負荷內的過電流,進一步可防患未然於因過電流而產生的異常事態。其結果也提高了連接到電流檢測電路200的電源電路100等的負荷的可靠性。By applying the current detecting circuit 200 of the first embodiment to a load such as the power supply circuit 100, it is possible to reliably detect an overcurrent flowing through the load, and it is possible to prevent an abnormal situation caused by an overcurrent. As a result, the reliability of the load connected to the power supply circuit 100 of the current detecting circuit 200 or the like is also improved.
第2實施例係將第二圖中所示之輸入電路201內的電阻器R1、R2改以可變電阻器來構成之例。第五圖係為第2實施例中關於輸入電路201的電路配置示意圖。第五圖中的輸入電路201係由可變電阻器R11(第1電阻器)與可變電阻器R12(第2電阻器)所構成。The second embodiment is an example in which the resistors R1 and R2 in the input circuit 201 shown in the second figure are changed by a variable resistor. The fifth diagram is a schematic diagram of the circuit configuration of the input circuit 201 in the second embodiment. The input circuit 201 in the fifth diagram is composed of a variable resistor R11 (first resistor) and a variable resistor R12 (second resistor).
如第五圖所示,輸入電路201藉由以可變電阻器R11(第1電阻器)與可變電阻器R12(第2電阻器)所構成,使各電阻值可對應差動電壓電路202和負荷側機器的規格變更等作任意調整。也就是如上所述,可變電阻器R11、R12的各電阻值可調整為使電流檢測節點A產生的負電壓與第2基準電壓VR2的電壓差為正電壓。As shown in FIG. 5, the input circuit 201 is constituted by a variable resistor R11 (first resistor) and a variable resistor R12 (second resistor), so that the respective resistance values can correspond to the differential voltage circuit 202. The specifications of the load side machine can be arbitrarily adjusted. That is, as described above, the respective resistance values of the variable resistors R11 and R12 can be adjusted such that the voltage difference between the negative voltage generated by the current detecting node A and the second reference voltage VR2 is a positive voltage.
如第六圖所示設置一個電阻值調整部203,讓可變電阻器R11、R12的各電阻值從外部也可調整。此一電阻值調整部203係藉由設置一個可從外部調整電阻值的操作部(圖中未表示),使可變電阻器R11、R12的各電阻值變得易於對應所連接的負荷裝置規格等作調整。As shown in FIG. 6, a resistance value adjusting unit 203 is provided to adjust the respective resistance values of the variable resistors R11 and R12 from the outside. The resistance value adjustment unit 203 is provided with an operation unit (not shown) that can externally adjust the resistance value, so that the resistance values of the variable resistors R11 and R12 can be easily adapted to the connected load device specifications. Wait for adjustment.
然而,第五圖雖表示一種輸入電路201以可變電阻器R11(第1電阻器)與可變電阻器R12(第2電阻器)所構成之例,但也可以用固定電阻器取代任一方而構成。這種場合時上述電阻值調整部203之配置即改為調整其中一方的可變電阻器的電阻值即可。However, the fifth diagram shows an example in which the input circuit 201 is constituted by a variable resistor R11 (first resistor) and a variable resistor R12 (second resistor), but it is also possible to replace either one with a fixed resistor. And constitute. In this case, the arrangement of the resistance value adjusting unit 203 may be performed by adjusting the resistance value of one of the variable resistors.
第3實施例係將第二圖所示之輸入電路201內的電阻器R1、R2改以複數電阻器所構成,並將這些複數電阻器的連接以設置於外部的電阻值切換部作切換之例。第七圖係關於第3實施例中的輸入電路201與電阻值切換部204的電路配置示意圖。第七圖中的輸入電路201係將電阻器R1(第1電阻器)改以複數的電阻器R21A、R21B構成,電阻器R2(第2電阻器)改以複數的電阻器R22A、R22B構成。In the third embodiment, the resistors R1 and R2 in the input circuit 201 shown in the second figure are formed by a plurality of resistors, and the connection of the plurality of resistors is switched by a resistor value switching unit provided outside. example. The seventh diagram is a circuit configuration diagram of the input circuit 201 and the resistance value switching unit 204 in the third embodiment. In the input circuit 201 in the seventh diagram, the resistor R1 (first resistor) is formed by a plurality of resistors R21A and R21B, and the resistor R2 (second resistor) is formed by a plurality of resistors R22A and R22B.
電阻器R21A、R21B的各連接節點與電阻器R22A、R22B的各節點係連接到電阻值切換部204。電阻值切換部204藉由讓連接節點間短路或打開,使電阻器R21A、R21B的一方或雙方為有效,電阻器R22A、R22B的一方或雙方為有效,使其具有切換電阻值之功能。此一電阻值切換部藉由設置一個可從外部調整電阻值的操作部(圖中未表示),使電阻器R21A、R21B以及電阻器R22A、R22B的各電阻值變得易於對應所連接的負荷裝置規格等作切換。The respective connection nodes of the resistors R21A and R21B and the respective nodes of the resistors R22A and R22B are connected to the resistance value switching unit 204. The resistance value switching unit 204 activates one or both of the resistors R21A and R21B by short-circuiting or opening the connection nodes, and one or both of the resistors R22A and R22B are effective, and have a function of switching the resistance value. The resistance value switching unit is provided with an operation unit (not shown) that can externally adjust the resistance value, so that the resistance values of the resistors R21A and R21B and the resistors R22A and R22B are easily adapted to the connected load. The device specifications are switched.
如第七圖所示,輸入電路201係將電阻器R1(第1電阻器)以複數個電阻器R21A、R21B構成,電阻器R2(第2電阻器)以複數個電阻器R22A、R22B構成,這些複數個電阻器R21A、R21B、R22A、R22B的連接則以設置於外部的電阻值切換部204作切換。藉由此一配置,各電阻值可對應差動電壓電路202和負荷側機器的規格變更等作任意調整。也就是如上所述,可切換這些複數個電阻器R21A、R21B、R22A、R22B的電阻值使電流檢測節點A產生的負電壓與第2基準電壓VR2的電壓差可變為正電壓。As shown in the seventh figure, the input circuit 201 is composed of a resistor R1 (first resistor) composed of a plurality of resistors R21A and R21B, and a resistor R2 (second resistor) is composed of a plurality of resistors R22A and R22B. The connection of the plurality of resistors R21A, R21B, R22A, and R22B is switched by the resistance value switching unit 204 provided outside. With this arrangement, the respective resistance values can be arbitrarily adjusted in accordance with the specification changes of the differential voltage circuit 202 and the load side device. That is, as described above, the resistance values of the plurality of resistors R21A, R21B, R22A, and R22B can be switched such that the voltage difference between the negative voltage generated by the current detecting node A and the second reference voltage VR2 can be changed to a positive voltage.
第4實施例係顯示一種從電流檢測電路200外部連接輸入電路201之例。第八圖係連接到第4實施例中相關的電源電路(負荷電路)100的輸入電路201與電流檢測電路200的概略配置示意圖。此外,因第八圖所示之電源電路100與第圖所示之電源電路100為同一電路配置,僅附上同一符號並省略配置說明。The fourth embodiment shows an example in which the input circuit 201 is connected from the outside of the current detecting circuit 200. The eighth diagram is a schematic configuration diagram of the input circuit 201 and the current detecting circuit 200 connected to the power supply circuit (load circuit) 100 in the fourth embodiment. In addition, the power supply circuit 100 shown in FIG. 8 is the same as the power supply circuit 100 shown in the figure, and the same reference numerals are attached thereto, and the description of the configuration is omitted.
第八圖中的電流檢測電路200備有如第三圖所示之差動電壓電路202。輸入電路201係連接到負荷側的電流檢測節點A與電流檢測電路200側的節點C之間。此時輸入電路201可適用第二圖或第五圖所示之輸入電路201,此外連接到第六圖所示之電阻值調整部203的輸入電路201,或是連接到第七圖所示之電阻值切換部204的輸入電路201亦可適用。The current detecting circuit 200 in the eighth diagram is provided with a differential voltage circuit 202 as shown in the third figure. The input circuit 201 is connected between the current detecting node A on the load side and the node C on the side of the current detecting circuit 200. At this time, the input circuit 201 can be applied to the input circuit 201 shown in the second or fifth figure, and further connected to the input circuit 201 of the resistance value adjusting unit 203 shown in FIG. 6, or connected to the seventh figure. The input circuit 201 of the resistance value switching unit 204 can also be applied.
第4實施例中藉由使輸入電路201連接到電流檢測電路200外部之配置,相對於僅由差動電壓電路202所構成的電流檢測電路200,上述第1實施例中所示之電流檢測電路200變為可追加過電流檢測功能。因此將輸入電路201連接到由既存的差動電壓電路202所構成的電流檢測電路200,藉由調整電阻值,可易於追加負荷側的過電流檢測功能。於是當由差動電壓電路202所構成的電流檢測電路200晶片化時其對負荷的適用範圍也可跟著擴大。In the fourth embodiment, by connecting the input circuit 201 to the outside of the current detecting circuit 200, the current detecting circuit shown in the above-described first embodiment is used with respect to the current detecting circuit 200 constituted only by the differential voltage circuit 202. 200 becomes an overcurrent detection function. Therefore, the input circuit 201 is connected to the current detecting circuit 200 composed of the existing differential voltage circuit 202, and by adjusting the resistance value, the overcurrent detecting function on the load side can be easily added. Therefore, when the current detecting circuit 200 constituted by the differential voltage circuit 202 is wafer-formed, its application range to the load can be expanded.
100...電源電路100. . . Power circuit
200...電流檢測電路200. . . Current detection circuit
201...輸入電路201. . . Input circuit
202...差動電壓電路202. . . Differential voltage circuit
203...電阻值調整部203. . . Resistance value adjustment unit
204...電阻值切換部204. . . Resistance value switching unit
R1、R2、R21A、R21B、R22A、R22B...電阻器R1, R2, R21A, R21B, R22A, R22B. . . Resistor
R11、R12...可變電阻器R11, R12. . . Variable resistor
V1...第1定電壓源V1. . . 1st constant voltage source
V2...第2定電壓源V2. . . 2nd constant voltage source
VR1...第1基準電壓VR1. . . First reference voltage
VR2...第2基準電壓VR2. . . Second reference voltage
第一圖係本發明之第1實施例之電流檢測電路的概略配置示意圖。The first diagram is a schematic configuration diagram of a current detecting circuit according to a first embodiment of the present invention.
第二圖係本發明之第1實施例之電流檢測電路的電路配置示意圖。The second drawing is a circuit configuration diagram of the current detecting circuit of the first embodiment of the present invention.
第三圖係本發明之第二圖的差動電壓電路的電路配置示意圖。The third figure is a circuit configuration diagram of the differential voltage circuit of the second diagram of the present invention.
第四圖係本發明之第二圖的輸入電路中各部的電壓與電流之關係示意圖。The fourth figure is a diagram showing the relationship between voltage and current of each part in the input circuit of the second diagram of the present invention.
第五圖係本發明之第二實施例之輸入電路的電路配置示意圖。Fig. 5 is a circuit configuration diagram of an input circuit of a second embodiment of the present invention.
第六圖係本發明之第五圖中連接到輸入電路的電阻值調整部的配置示意圖。Fig. 6 is a view showing the configuration of a resistance value adjusting portion connected to an input circuit in the fifth diagram of the present invention.
第七圖係本發明之第三實施例的電阻值切換部與輸入電路連接的電路配置示意圖。The seventh diagram is a circuit configuration diagram in which the resistance value switching portion of the third embodiment of the present invention is connected to an input circuit.
第八圖係本發明之第四實施例的電流檢測電路外部連接輸入電路的電路配置示意圖。The eighth diagram is a circuit configuration diagram of the external connection input circuit of the current detecting circuit of the fourth embodiment of the present invention.
第九圖係習知電流檢測電路的電路配置示意圖。The ninth diagram is a schematic diagram of the circuit configuration of a conventional current detecting circuit.
第十圖係第九圖的差動電壓電路的電路配置示意圖。The tenth diagram is a circuit configuration diagram of the differential voltage circuit of the ninth diagram.
100...電源電路100. . . Power circuit
200...電流檢測電路200. . . Current detection circuit
201...輸入電路201. . . Input circuit
202...差動電壓電路202. . . Differential voltage circuit
R1、R2...電阻器R1, R2. . . Resistor
V1...第1定電壓源V1. . . 1st constant voltage source
V2...第2定電壓源V2. . . 2nd constant voltage source
VR1...第1基準電壓VR1. . . First reference voltage
VR2...第2基準電壓VR2. . . Second reference voltage
Claims (11)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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JP2009011638A JP5422212B2 (en) | 2009-01-22 | 2009-01-22 | Current detection circuit |
Publications (2)
Publication Number | Publication Date |
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TW201028706A TW201028706A (en) | 2010-08-01 |
TWI414801B true TWI414801B (en) | 2013-11-11 |
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ID=42355721
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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TW098138008A TWI414801B (en) | 2009-01-22 | 2009-11-10 | Current detection circuit |
Country Status (4)
Country | Link |
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JP (1) | JP5422212B2 (en) |
KR (1) | KR101374848B1 (en) |
TW (1) | TWI414801B (en) |
WO (1) | WO2010084652A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI658278B (en) * | 2015-03-19 | 2019-05-01 | 日商艾普凌科有限公司 | Current detection circuit |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
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KR101458983B1 (en) * | 2013-04-29 | 2014-11-10 | 코원에너지서비스 주식회사 | Digital remote control and supervisory circuit for a rectifier |
JP6796732B1 (en) * | 2020-01-20 | 2020-12-09 | 日立ジョンソンコントロールズ空調株式会社 | Circuit boards, circuits and air conditioners |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04351969A (en) * | 1991-05-29 | 1992-12-07 | Fujitsu Ltd | Electric current measuring circuit |
JPH09243673A (en) * | 1996-03-05 | 1997-09-19 | Nippon Telegr & Teleph Corp <Ntt> | Signal level detection circuit |
TW358887B (en) * | 1997-04-24 | 1999-05-21 | Sanyo Electric Co | Electric current detection circuit having an automatic offset correction circuit |
JP2002082139A (en) * | 2000-09-05 | 2002-03-22 | Advantest Corp | Power source voltage monitoring circuit |
US6617838B1 (en) * | 2001-09-11 | 2003-09-09 | Analog Devices, Inc. | Current measurement circuit |
TW591234B (en) * | 2001-02-16 | 2004-06-11 | Fuji Electric Co Ltd | Current detector and overload current protective device using the same |
US6946828B1 (en) * | 2003-05-20 | 2005-09-20 | Ami Semiconductor, Inc. | Bi-directional current measurement circuit that uses a transconductance amplifier to generate a copy current |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58182317A (en) * | 1982-04-19 | 1983-10-25 | Sony Corp | Comparison circuit |
-
2009
- 2009-01-22 JP JP2009011638A patent/JP5422212B2/en not_active Expired - Fee Related
- 2009-10-28 KR KR1020117016223A patent/KR101374848B1/en not_active IP Right Cessation
- 2009-10-28 WO PCT/JP2009/068451 patent/WO2010084652A1/en active Application Filing
- 2009-11-10 TW TW098138008A patent/TWI414801B/en not_active IP Right Cessation
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04351969A (en) * | 1991-05-29 | 1992-12-07 | Fujitsu Ltd | Electric current measuring circuit |
JPH09243673A (en) * | 1996-03-05 | 1997-09-19 | Nippon Telegr & Teleph Corp <Ntt> | Signal level detection circuit |
TW358887B (en) * | 1997-04-24 | 1999-05-21 | Sanyo Electric Co | Electric current detection circuit having an automatic offset correction circuit |
JP2002082139A (en) * | 2000-09-05 | 2002-03-22 | Advantest Corp | Power source voltage monitoring circuit |
TW591234B (en) * | 2001-02-16 | 2004-06-11 | Fuji Electric Co Ltd | Current detector and overload current protective device using the same |
US6617838B1 (en) * | 2001-09-11 | 2003-09-09 | Analog Devices, Inc. | Current measurement circuit |
US6946828B1 (en) * | 2003-05-20 | 2005-09-20 | Ami Semiconductor, Inc. | Bi-directional current measurement circuit that uses a transconductance amplifier to generate a copy current |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI658278B (en) * | 2015-03-19 | 2019-05-01 | 日商艾普凌科有限公司 | Current detection circuit |
Also Published As
Publication number | Publication date |
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KR20110099312A (en) | 2011-09-07 |
KR101374848B1 (en) | 2014-03-18 |
JP2010172099A (en) | 2010-08-05 |
WO2010084652A1 (en) | 2010-07-29 |
JP5422212B2 (en) | 2014-02-19 |
TW201028706A (en) | 2010-08-01 |
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