TW591841B - A method for detection and protection of short circuit - Google Patents

Abstract

Disclosed a method for detection and protection of short circuit under abnormal conditions of high current driver short circuit in the integrated circuit, and the operation is not influenced by variation of sensing circuit.

Description

591841

[Technical field to which the invention belongs The present invention relates to a field 0 suitable for high-current drive sources] A type of short-circuit detection and protection circuit, especially a short-circuit detection and protection circuit in an integrated circuit [previous technology] The reason for the overload of the integrated circuit is that it includes the short circuit of the line itself; or it can withstand the large current with too low impedance, such as: connecting two or more driving source pins to each other or driving The source pin is directly connected to the power source (p〇wer source) Φ. When the voltage at the two ends of the interconnection is not equal, the current value of the drive source will instantly exceed the rated safety range, which will cause damage to the integrated circuit. The internal resistance of the source is extremely low, and it will cause an abnormal phenomenon of instantaneous large current, which will damage the entire integrated circuit or cause other circuits to short circuit. Therefore, the current common solutions to the above-mentioned disadvantages are roughly as follows, among which: (1) For example, US Patent No. 5,9 7 3,5 6 9 (such as Annex I) discloses a known resistance Capture its voltage and compare it with a reference voltage formed by a bandgap reference circuit, and compare it with a comparator circuit to detect whether there is an abnormal current; however, its voltage is measured (see Attachment 1) is generated through a current mirror (circuit Mirror), but the gate voltage of Q303 and Q305 is a pulse width modulation (Pulse Width)

Page 4 591841 V. Description of the invention (2)

The switching voltage generated by Modulation) does not have the effect of a current mirror, so there is no ^ ^ to the purpose of the detection of the L mirror track (track 丨 ng), and its reference to the electric circuit of the month bf gap circuit (band gap Reference circuit) is relatively complicated and relatively increases production costs. (2) Another example is U.S. Patent No. 6,108, ι82 (such as Annex II), which is a circuit capable of self-adjusting (se 1 fadjusting) overcurrent sensing signals, which is mainly composed of two resistors (resjst. rs η and 12) After converting the high voltage, the bipolar transistors (bi po 1 ar transistors 13 and 14) and the current mirror (current mirror 15 and 16) composed of MOSFETs are used to capture the two comparison currents II, 12 Wherein, when I2 > I1, make the point A output a high potential and compare it with a certain voltage source 3.5V to detect this overcurrent phenomenon and trigger the protection circuit to achieve the purpose of short circuit protection. However, the protection circuit needs to cooperate with a bipolar transistor (B 丨 叩 1 ^ transistor), using a stable base-emitter voltage difference (~ m to achieve the purpose of detection, and a reference power supply (3.5V) High cost, and this circuit structure cannot be applied to metal oxide half (M0S) [Summary of the invention]

The main purpose of the present invention is the circuit, the main purpose of which is to detect and prevent the IC from being affected by overload or ectopic resistance. Provide a short-circuit detection and protection circuit.

Page 5 591841 V. Description of the invention (3) In order to achieve the above purpose, the present invention includes: a switching transistor, which respectively captures a first input signal and a second input signal; a trigger control transistor, which defines the input signal Trigger detection period; one input of the comparator 'is connected to the output of the switching transistor, and the other is connected to the voltage-dividing resistor; and the other end of the voltage-dividing resistor is connected to the output of the triggering control transistor, the load resistor One end is connected to the output terminal of the switching transistor, and the other end is grounded; and a detection resistor is connected between the two input terminals of the comparator. Therefore, if an overcurrent occurs when the control transistor is turned on (0vercirrent) When the circuit is short-circuited, the voltage of the detection resistor is greater than the internal voltage of ^^^^, so that the comparator outputs a control signal, and the input is interrupted to protect the related circuits. [Embodiment] Yu Ϊ Ϊ: Yue provides a short-circuit detection and protection circuit, "is applicable to the actual detection circuit of the present invention shown in Figures-and Figure 3 (refer to the timing diagram), where The short-circuit detection circuit 1, a trigger control transistor 2, a switching electric day ^ 1,-detection resistor R 2 and-negative 胄 'f 3, in a voltage divider resistor:器 RL; Its

591841 V. Description of the invention (4) The wide switching electrical system can be composed of complementary metal oxide semiconductors) PM 0 S a NM 0 S m " le CrCrUCUCtor, CM 0 is connected to the NM 〇S ,, and decay, ": m PM 〇S drain to power (Vcc) electrode 'and the source of WM〇S is connected

Ground), and connected to the ground potential through the source of the gate 0S (input signal, the M pole captures the first-input signal V 1 and the second trigger control electric crystal source and gate respectively Connect ^ ,, 0s (low level trigger), the gate of its P MOS, and now: the source (Vcc) and the non-inverting input of the comparator 3 of the switching transistor 1 via the divider ... The inversion to comparator 3 is at A, and the detection resistors R 2 are connected respectively.

, Non-phase = (-) and non-inverting wheel-in terminal (+) VB in comparator 3, and the comparison input ^ + input terminal (+) forms the wheel-in terminal voltage voltage VA, and the comparison The inverting 2 input terminal (-) forms the input terminal, a load resistor RL 1 ^ = the output terminal forms the output terminal voltage VC-), and the other-terminal is connected to: the inverting input terminal of the electric: 1 comparator: 3 (Inverting input terminal (-), * pull C GrOund), and the output voltage ν 'of comparator 3 and comparator 3 is on, and the output terminal of transistor 1 is abnormal, such as ratio or short circuit. . If the position is low, you can know whether the overcurrent is clear. Refer to the third solid%-^ to make a timing diagram, which is the second sequence =: ^ = the second implementation of the circuit implementation structure of the first picture "and the comparator turns; ': Voltage :: Signal = 1, the level of the second input signal voltage VC, where · A 'VB and the output terminal voltage

P.7 591841 Fifth invention description (5) When the first input signal Vl is High (T0 ~ TY 1 and the second input signal V 2 are both high potential triggering control transistors 2 are both surgery: switching transistor 1 & PM0s, the resistor R1 and the detection thunder RB are in the on state, so no current flows through the voltage divider ^ and the detection resistor R2 ', so = than the two input terminals of 113 • "Zero port; output ; Terminal vc is low potential Π-) state. "T") signal! When uV 2 turns to low potential (L-) state (

, ^ t The input terminal voltages v A and v B of the car parent state 3 are controlled by the trigger control transistor 2; ΰ is still wrong with the voltages of VA and VB ^ :; f This transistor is still off, so that if the first As soon as the input signal V i is turned into a crystal! PM0S and trigger control 2) Both = The first input Guangshun number v 1 and the second input signal v 2 are both low potential two: at t (QT2-T3), the current is triggered by the power source (Vcc): The source and drain of the crystal 2 pass through the voltage dividing resistor r 丄, check 2: J benefit R 2 and the load resistor RL to the ground potential (Gr_d), this heart: * the load resistance RL is too small or is switched by the switch The output terminal of the crystal 1 is directly connected to the short-circuit condition generated by the (G—) household kilogram. The excess voltage generated by flowing through the voltage-dividing resistor r detection resistor R 2 will also flow at a predetermined voltage Vth (T > T3), Make the comparison \ output two to two vc output high potential (High), so as to reach 3 = out? The purpose of voltage. ^ j Detecting overload or short-circuit conditions 591841 V. Description of the invention (6) '' ~ '---- Because the trigger control transistor 2 is a high-conduction current-carrying transistor, the impedance of 1 is extremely low. Make the power supply UcO all drop to the voltage dividing resistor R] to detect the resistance state R 2 and the load resistor R L, so check! The voltage resistor " forms-proportional voltage division, so that the detection action has nothing to do with the resistance being the absolute value of the impedance, so even if please refer to Figures [4 and 4] again, it is the structure and action of the real position of the present invention. Timing chart, where: "Yu-feng touch

Μ. The? 1 transistor can be composed of complementary metal oxide semiconductors (C = UM0S and NMOM, whose "two and pole systems are connected to the NMOS system is connected to a power source (VCC), Q WPM0S The source is ground, and the source is connected to the ground power and the second input signal to capture the -input signal through the interrogator ", and the trigger control transistor 2 is N Μ〇 S (High level network |,

雷 日 舻 1 MU series knife is connected to the ground potential (Ground :) in MR ^ Λ Λ? S " ^-^ it :: A non-inverting to the A3, VB ^! 3 device rl 'to the power supply, (Vcc), and the comparator / (negative-negative "resistance) is connected to the output terminal of the switching transistor 1. The drama input terminal (+ so that when the first-the input signal V1, and the second input signal V2, both

591841 on page 9 V. Description of the invention (7) When low potential (Low), (τ0 ~ τ High potential, first extension), or when the first input signal V 1 is CT1 -T2) Trigger the control electric current to flow through the voltage-dividing resistor R], _ ",,,, and so on, so there is no resistor R2, and the voltage difference between the two ends is 2, so that the voltage difference between the detection ends is sudden. # 2 Zero, that is, the two inputs and outputs of comparator 3 are low-power green) The zero shape enables the output terminal voltage vc 'of comparator 3 to be in the form of crystal kNM 0S and trigger control (H f). ^ Power supply (Vcc ) Flow through the Japanese body 2 in sequence, and the current is 2 ′, the voltage-dividing resistor R i,, the back, and the resistor scale L ′. The detection resistor and drain are connected to the ground potential (Gr. und). If the source of the Zhaoyang body 2 is at this time, if the load resistance R 丨, ±, is connected to the power supply (Vcc), a short signal is generated: the output terminal is straight R1, or the detection resistor R2, The current will exceed the predetermined voltage vth in the positive voltage-dividing resistor 3: the output voltage of T produced 4 will also be higher than the comparator (High) short-circuit condition. It is worse to detect overload or trigger control Crystal 2 is a high-conductance < extremely low impedance value, so that when the power supply (Vcc) is all turned on, its detection resistor R 2 and voltage-dividing resistor R, load resistor RL, R 2 and voltage-dividing resistor Device R 1, forming a proportional voltage divider I detection resistor Primary measurement resistor The absolute value of the resistance of the resistor has nothing to do with the measurement action and | make the detection more accurate. Page 10 V. Description of the invention (8) Real. The diagram-〆 第-图 的 低 准 Ϊ is a further embodiment of the present invention, which is a combination of the hairpin embodiment and the high-level triggering embodiment of the second figure. The switch circuit is a circuit, where · · The gate of the control transistor to r :-p M〇s is the same as the trigger voltage V / M0S of the same polarity. 2 (triransis- sends the control power / office / interconnect and connects to the input signal V 3 And the drain of the first day _ (PM〇s) 2 is connected through the non-inverting input terminal (+) of the comparator 3 1 through the voltage dividing resistor R i, and the terminal voltage is input to the source It is connected to the power supply (Vcc). Input. .The NMQ of NM switching transistor 1 ς n B 丨 π ς ^ ^ is ^ w υ s's gate is the same polarity (N Μ 〇s) trigger control transistor The gates of (NOMS) 2, control transistor) are connected to each other, and are numbered V4, and the drain of the trigger control transistor 2 'passes through the sub-piezo 1 device, and the inverting wheel input end of the second comparator 32 (―) The input terminal voltage is connected to $, and its source is connected to the ground potential (Ground, the non-inverting wheel-in terminal of the first comparator 31 1 (the inverting input terminal (a) of the device 32, which is divided into刖 ^ 一一 一 乂 乂 ^ ^ 1 r P 9 ^ ^ 1 series knife is formed by connecting a first detection resistor · port 4 1 (R 2) and a first detection resistor 4 2 (R 2,)- The middle terminal point is connected to the p M OS of the switching transistor and the drain of the NMOS, and is also connected to the inverse of the first comparator 3ι 591841. 5. Description of the invention (9) The point is connected to the load resistor at the same time RL, the other end of the load resistor RL is connected to a voltage VR, and the output terminals VC and VC of the first comparator 31 and the second comparator 32 are respectively connected to an OR gate 5 (OR Gate) Input. With the above-mentioned circuit architecture, this circuit can detect an overcurrent or short-circuit condition regardless of whether the input signals V 3 and V 4 are at a low level or a high level at the same time, and through the first detection resistor 4 1 (R 2) Or the second detection resistor ⑻4 2 (R 2 ′) is greater than the first comparator 31 or the second comparator ^ 2: After the predetermined voltage V th (V th,), the output terminal voltage ▽ 'outputs high Potential (High) and outputting a high electric image at VD (H i gh) 'so as to reach the high level or low level can detect overload or loopholes, and the embodiment shown in the fifth figure above In the switch transistor 1 and the first input eight signal = 1 and the second input signal v 2 are respectively provided with an overcurrent control circuit 6 (shown by J Γ 丨), and the output terminal of the OR gate 5 Separately set your Sen shouted ® ,, ☆ + control 'to avoid large electricity in the event of overcurrent or short circuit, and the second signal f # V = control circuit 6 simultaneously cut off the first input signal V No. Q output : U and 'check, and turn the switching transistor 1 off to flow tender! : Up = the purpose of protecting the overall circuit. Said that R 1 constitutes the first detection type II; also ... l (β- L0a, 2, which is different from that of the first comparator, and the above-mentioned trigger control motors 4 1, 4 2 and V " Resistor 1 ~ the second comparator 32, the detection circuit 7 and the second detection circuit 7, (as shown in the eighth figure), the first detection circuit 2

591841 V. Description of the invention (10) A balance negative is connected between the test circuit 7 and the second detection circuit 7 '(as shown in the seventh figure). Know if there is an overload or short circuit situation, basin L = V 2 is in phase, V 1 'is in phase with V 2, but v 丄 is in phase with 乂 丄 /, 1 phase, and V 2 and V 2' are in opposite phases. ", Corresponding to V102 is a low voltage (V1, and V2 are high power, the PMMOS of the switching transistor 1 is turned on (please refer to Figures 7 and 8 at the same time) (the MMOS is turned off), The switching transistor 丄 is also turned on (its P MOS is turned off), and the current is sequentially flowed through the switching transistor 丄 p MOS by the power source (Vcc) of the switching transistor 1 (Vcc). The load 8 and the switching transistor 1 'N MOS to ground potential (, Ground), and because the trigger control transistor 2 of the first detection circuit 7 has been turned on, a current flows from the power source (Vcc) through the trigger control transistor 2 , Voltage-dividing resistor R] _, detection resistor R 2, balanced load 8 and switching transistor 1 ′ N MOS to ground (Ground). At this time, if the resistance of balanced load 8 is too low, this current is Increase. If point B is short-circuited to the ground potential (Ground), the current flows from the above path through the power supply (Vcc) through the voltage dividing resistor R 1 and the detection resistor R 2 to the ground potential (Ground), and the current increases more. Above These two states will cause the voltage drop of the detection resistor R 2 of the first detection circuit 7 to be higher than that of the first detection circuit. The predetermined voltage V th in the first comparator 31 of the circuit 7 causes the first comparator 31 to output a high voltage (High) and output a high potential (V) to VD through the OR gate 5 (OR Gate 5). If B ' When the terminal is short-circuited to the power supply (Vcc), due to the second detection circuit 7

Page 13 591841 V. Description of the Invention (ll), the trigger control transistor 2, I Vcc) resistor R 1, to the trigger control transistor 々, the state R 2, and the divided voltage

Ground), the current flowing through its detection electrode and the source to ground potential (the current will also exceed the legitimate letter L 2 and the voltage divider resistor R 1, the resulting excess electrical migration will also: The detection resistor R 2 is set to be the first in the 32; the second comparator of the detection circuit 7 ′ is dusty (high) and passes through the gate or the output of the comparator 3 2 to a higher potential (High), thereby far ate 5) For VD output high voltage, otherwise, if the purpose of short circuit or short circuit conditions. Voltage), the switching transistor ^ ㈡ with 1 "with Μ '" See the seventh and eighth m ^ M0S cold pass (hereinafter please also the N Μ 〇s of the crystal 1 (its NM 0 S is off), switch The electric switch transistor 1, the electricity / j (its PM0S is off), the current flows from p μ s, the balance negative / β (cc) sequentially through the switch transistor 1 '(Ground) and the switch circuit The heart of the crystal 1 has been turned on to the ground electric body 2. # 土 于 弟 一 Detect circuit 7, the trigger control transistor, the voltage-dividing resistance number Γτ flows through the trigger control transistor 2 from the power source (Vcc). tlNJ Λ / Γ 1, detection resistor R 2, balanced load 8 and switch said-S to ground (Ground). At this time, if the balance is negative "resistance; ^ low," this current will increase. If B, point short circuit To the ground potential GrC ^ nd) the current from the above path through the power supply (Vcc) through the voltage divider = resistor, 1 and the detection resistor R 2 to the ground potential (Ground), the current increases = more. The two states will make the voltage drop of the second detection circuit 7 with a detection resistance of R 2 higher than that of the second detection circuit 7

591841 V. Description of the invention (12) The ^ th m β of 1 compares the predetermined voltage V th in Jie 3 1 to make the first comparator n Ershan: voltage (hlgh) and pass through OR gate 5 (OR Gate · 5) The VD outputs a high potential (High). > When the total I ^ is short-circuited to the power source (Vcc), because the first detection circuit 7) flows through the first = Λ conduct; ", the current " (equivalent to Vcc '' egg circuit 7 detection resistor R 2 'and The potential of the voltage-dividing resistor R 1 to the trigger control transistor 2 and the drain and source to ground (μ as flowing through its detection resistor R 2 ′ and the voltage-dividing resistor R 1) ^^^ are over normal values , This excess current is in the detection resistor R 2, so the internal pressure of 2 will also be higher than the second comparator 3 of the-detection circuit 7

Uii2Vth, * The output of the second comparator 3 2 is high voltage (= ί = 5) ... the output is high potential (up to g of the overload or short-circuit condition of the 彳 测 measurement. The second detection power! ^ 不 ^ 任 ^ Any abnormal conditions are caused by The first detection circuit 7 or this result will be produced by a certain assassin—the comparator will output a high potential (High), seventh = circuit 7 or 7 ', or 5 (〇 " ❿5) and all inputs will be rounded out. High potential (High), this output signal passes V2 / V1, / 丄 L, CTL, will cut the input signal VI / break this Yu when 2 cut off 'make all switching transistors 1 open circuit and cut off -I, hanging current to achieve The purpose of protecting this circuit. [Characteristics and Effects] Compared with other technology detection and protection circuits, the technology of the present invention has the following advantages:

Page 15 591841 V. Description of the invention (13) The detection resistor is 8 years old. Action and detection resistor: Fort resistor ... Proportional voltage divider 'makes detection 2 unnecessary. Design = irrelevant to the value. ^ < Reference potential circuit, which can effectively save the process into ° 3, electricity measurement: the voltage across the device is directly compared with the predetermined voltage of the comparator, without reference to the power supply (Vcc) or ground potential (grund) 〇 Ming, ί C, 22. Ming refers to a specific example of a possible embodiment of the present invention: the column is not intended to limit the scope of the patent of the present invention (such as) equivalent to the implementation or modification of the spirit of Ming technology Shall be included in the scope of patents in this case. The above mentioned case is not only innovative in terms of technical ideas, but also enhances the above-mentioned multiple effects over conventional items. It should have fully met the requirements for statutory invention patents that are novel and progressive, and applied in accordance with the law. This invention patent application is designed to encourage inventions, to the utmost convenience.

Page 16 591841 Brief description of the drawings [Schematic diagram The first diagram is the second diagram is the third diagram is the fourth diagram is the fifth diagram of the circuit. The sixth diagram is the eighth circuit with the seventh diagram. Description of the circuit frame of the diagram] ^ ^ The detection circuit invented when the high-level trigger is implemented is the operation timing diagram of the circuit implementation architecture in the first figure '. ,ten billions. The implementation structure of the detection circuit of the present invention when the low-level trigger is triggered. A timing diagram of the implementation of the architecture for the circuit in the second figure. ° The invention can further implement the architecture at a low level and a high level at the same time. < 彳 Testing is an implementation of the present invention which can further detect and control circuits at low and high levels simultaneously. . · This is the detection implementation structure composed of the trigger control transistor and the comparator. The present invention is implemented in B T L (Balance-Tied Load). The main part of the symbol], 1, ... Switching transistor

2 ...... Trigger control transistor 3 · ..... Comparator 4

5

First comparator Second comparator First detection resistor Second detection resistor OR gate (R 2) (R 2 ’) • · · Overcurrent control circuit

Page 17

591841 Brief description of the diagram 7 ... First detection circuit 7 '... Second detection circuit R1, R1' ... Voltage-dividing resistors R2, R2 ' ... detection resistors RL, RL '... load resistors

Claims (1)

591841 VI. Application for patent scope 1. A switch electric trigger control comparator divides the piezoelectricity and the other end is connected to the load electric detection electric in the trigger controller. 2. It is opened as described above. 0S and N Μ 3. The touch of jinshu 4, such as the touch of zhonghu jinshi >> polarity> input> touch of polar switch transistor signal> partial voltage and type A short-circuit crystal, transistor, one of the resistors, for comparison Resistors, resistors, transistor voltages, apply for special control of transistor 0s, apply for special control, apply for special control of short-circuit complementary signals; complementary matching series detection resistors detect electricity to pick up the body, the system , To take input defines the input end of the input wheel is connected to the contactor and the other is connected to the conduction, so that the car can be composed. Lee range transistor Lee range transistor detection Electric switch electrically triggers the control connection to the time period; an input switch should be compared to make the detector output the first item from the complementary less include: signal; π π · detection date of the incoming signal 1'The output terminal of the switching transistor: the output terminal of the control transistor; the output terminal of the crystal; and between the two input terminals of the device, if the voltage of the resistance measurement is greater than the comparison control signal. The short-circuit detection circuit is the short-circuit detection circuit described in item 1 of the metal oxide semiconductor PM, which can be triggered at a high level. The short circuit detection circuit described in the first item can be triggered at a low level. Circuit, which includes: a crystal, which respectively captures a first input signal to make a transistor, and respectively defines the first input signal and the second output with the same polarity as the foregoing. Page 19 · 591841 VI. Patent application scope-a first comparator, which triggers a control transistor-a second comparator, the other input of the device and the switch are connected to a first through another voltage dividing resistor A detection resistor; and a second detection resistor, which is used to trigger a control transistor or a comparator to output a control signal in the second comparator. 6. The switching transistor and the oxide semiconductor PM0s as described in the patent application. 7. The trigger control transistor as described in the patent application. An input terminal of the trigger control transistor is connected to the output terminal through a voltage dividing resistor. The input terminal is connected to the output terminal of the first comparative electric solar object with a different polarity. The other input terminal is connected to the output terminal of another trigger control transistor. The terminal is connected between the two input terminals of the first comparator. When the two input terminals of the two comparators are turned on, a constant voltage greater than the first comparison is generated, so that the first comparator or the second ratio | the short-circuit detection circuit described in item 5 triggers the control transistor The system can be composed of complementary metals and N MOS. The short circuit test circuit described in item 5 includes a local level trigger and a low level trigger. 8. The short circuit detection circuit described in item 5 of the patent application scope, which further includes: 〃 Overcurrent control The circuit is connected to the input signal and the electric door, and the control terminal is connected to the output terminal of the OR gate to receive the aforementioned = system No. 2 and the input terminal is disconnected to protect the related circuit. ° > 9. The short-circuit detection circuit as described in item 8 of the scope of patent application, wherein the control signal of the overcurrent control circuit is through the OR gate (Gat page 20, 591841 VI, scope of patent application e) take. 10. A short-circuit detection circuit, comprising: a first detection circuit having two input terminals to respectively capture a first input signal and a second input signal; a second detection circuit having two input terminals to respectively capture another first signal The input signal and the second input signal; and a balanced load connected between the detection terminals of the first detection circuit and the second detection circuit. 11. The short-circuit detection circuit as described in item 10 of the scope of patent application, wherein the first input signal of the first detection circuit and the second round of input signals are in phase, and the other first input of the second detection circuit The signal is in phase with the second input signal. 12. The short-circuit detection circuit as described in item 10 of the scope of patent application, wherein the first input signal or the second input signal of the first detection circuit and another first input signal or the other of the second detection circuit The second input signal is out of phase. 1 3. The short-circuit detection circuit as described in item 10 of the scope of patent application, wherein when the first input signal of the first detection circuit transitions from a low potential (Low) to a high potential (High), it is The timing of the input signal precedes, and when it transitions from a high potential (High) to a low potential (Low), it is later than the timing of the second input signal. 14. The short-circuit detection circuit as described in item 10 of the scope of patent application, wherein when the other first input signal of the second detection circuit transitions from a low potential (L ow) to a high potential (H i gh), Timing compared to another second input signal Page 21 6. The scope of the patent application is first, which is lower than that of the second one. If the application is different, the first detection polarity and the second switch electrical signal are passed to the other device; and, The actuator or the first comparator input 16 of which the semiconducting input signal polarity of the inter-crystalline transistor is triggered by the first divided by the second ratio of the trigger and controlled by the second ratio of the first divided by the first divided voltage. Please check the patent for the high-voltage input signal. No .; the complement is connected with the resistor when testing in series; the comparator, the transistor comparator, the terminal and the resistor are connected to measure the resistance (High) after the timing of the turn, the first 10 and the second detection turn off the transistor, The control transistor is sent to determine segments at the same time; when the wheel output of one input terminal body is turned off, one of the input terminals is connected to another trigger of the transistor when it is connected to a low potential (L 0w). The short-circuit detection circuits described in the item all include at least: the first input signal body is respectively captured, and the first input signal and the second input second detection of the same polarity as the above-mentioned second detection are compared with the trigger two to control, such as The stated open-body oxidation test resistor is connected to a predetermined voltage and signal in the control transistor when it is turned on.凊 The scope of the patent No. 10: The transistor and the trigger control object are connected to a first comparison output terminal of different polarity through a voltage dividing resistor, and the other input terminal is through the output terminal of the control transistor. Between the two input terminals of the second comparator, a short-circuit detection circuit greater than that of the first comparison or the first comparator or the second ratio is generated. The crystal system can be made of complementary gold. Composed of. Page 22 591841 VI. Patent application scope 1 7. The short-circuit detection circuit described in item 15 of the patent application scope further includes: an overcurrent control circuit, the trigger terminal of which is connected to the first detection circuit and the first The output terminal of the second detection circuit is used to protect the related circuit by breaking the input signal when a control signal is generated in an abnormal state. 18. The short-circuit detection circuit as described in item 17 of the scope of patent application, wherein the control signal of the over-current control circuit can be captured through an OR gate. Page 23