Semiconductor circuits

Abstract

The present invention discloses a semiconductor circuit, including a circuit board and a high-voltage integrated circuit, the high-voltage integrated circuit includes a power supply undervoltage protection circuit, an inverter bridge drive circuit and an error reporting circuit, the power supply undervoltage protection circuit includes an undervoltage detection unit and a fault logic control unit, the signal input end of the fault logic control unit is electrically connected to the undervoltage detection unit, and the signal output end of the fault logic control unit is electrically connected to the inverter bridge drive circuit and the error reporting circuit respectively; the undervoltage detection unit includes a diode, a fourth resistor, a capacitor and a comparator, the diode, the fourth resistor and the capacitor form a charging circuit, the charging circuit is electrically connected to the reverse input end of the comparator, the same-direction input end of the comparator is electrically connected to the power supply, and the output end of the comparator is electrically connected to the fault logic control unit. The semiconductor circuit proposed by the present invention can realize that the undervoltage protection voltage rises according to the working time. When the work starts, the undervoltage protection voltage is low, and the undervoltage protection voltage rises after the work is stable.

Description

Technical Field

[0001] The present invention relates to the field of power semiconductors, and in particular to a semiconductor circuit. Background Art

[0002] Semiconductor circuit is a power drive product that combines power electronics and integrated circuit technology. It has the advantages of high current, low saturation voltage and high withstand voltage of GTR (high power transistor), and high input impedance, high switching frequency and low driving power of MOSFET (field effect transistor). The semiconductor circuit integrates logic, control, detection and protection circuits, which is easy to use. It not only reduces the size and shortens the development time, but also enhances reliability, adapting to the development direction of today's power devices.

[0003] Semiconductor circuits include high-voltage integrated circuits, or HVICs, which are integrated circuit products that convert MCU signals into IGBT-driving signals. HVICs integrate PMOS tubes, NMOS tubes, triodes, diodes, voltage regulators, resistors, and capacitors to form Schmitt, low-voltage level, high-voltage level, pulse generation circuits, delay circuits, filter circuits, over-current protection circuits, over-heat protection circuits, under-voltage protection circuits, bootstrap circuits, and other circuits. On the one hand, HVIC receives the control signal of the MCU to drive the subsequent IGBT or MOS to work, and on the other hand, it sends the system status detection signal back to the MCU.

[0004] When HVIC is used, if its power supply VCC is shared with other electronic components, when the system starts gradually and does not run stably, VCC fluctuations are inevitable, triggering the undervoltage protection of the intelligent power module, thus causing the system to fail to start. Summary of the invention

[0005] The main purpose of the present invention is to provide a semiconductor circuit, aiming to solve the technical problems raised in the above background technology.

[0006] To achieve the above-mentioned object, the present invention provides a semiconductor circuit, the semiconductor circuit includes a circuit board and a high-voltage integrated circuit, the high-voltage integrated circuit includes a power supply undervoltage protection circuit, an inverter bridge drive circuit and an error reporting circuit, the power supply undervoltage protection circuit includes an undervoltage detection unit and a fault logic control unit, the signal input end of the fault logic control unit is electrically connected to the undervoltage detection unit, and the signal output end of the fault logic control unit is electrically connected to the inverter bridge drive circuit and the error reporting circuit respectively;

[0007] The undervoltage detection unit includes a diode, a fourth resistor, a capacitor and a comparator. The diode, the fourth resistor and the capacitor form a charging circuit. The positive electrode of the diode is electrically connected to the power supply, the negative electrode of the diode is electrically connected to one end of the fourth resistor, the other end of the fourth resistor is electrically connected to one end of the capacitor and to the inverting input end of the comparator, the same-direction input end of the comparator is electrically connected to the power supply, and the output end of the comparator is electrically connected to the fault logic control unit.

[0008] Preferably, the power supply undervoltage protection circuit also includes a first Schmitt trigger and a first filter, the first Schmitt trigger, the first filter and the undervoltage detection unit are electrically connected in sequence, the first Schmitt trigger is used to perform waveform correction on the electrical signal, and the first filter is used to filter out noise in the electrical signal.

[0009] Preferably, the power supply undervoltage protection circuit further includes a first resistor, one end of the first resistor is electrically connected to the power supply, and the other end of the first resistor is grounded.

[0010] Preferably, the high-voltage integrated circuit also includes an overcurrent protection circuit, which includes a second Schmitt trigger, a second filter and a first level converter electrically connected in sequence, the first level converter is also electrically connected to the fault logic control unit, the second Schmitt trigger is used to perform waveform correction on the electrical signal, and the second filter is used to filter out noise in the electrical signal.

[0011] Preferably, the overcurrent protection circuit further includes a second resistor, one end of the second resistor is electrically connected to the overcurrent signal detection input terminal, and the other end of the second resistor is grounded.

[0012] Preferably, the high-voltage integrated circuit also includes an enable end detection circuit, which includes a third Schmitt trigger, a third filter and a second level converter electrically connected in sequence, the second level converter is also electrically connected to the fault logic control unit, the third Schmitt trigger is used to perform waveform correction on the electrical signal, and the third filter is used to filter out noise in the electrical signal.

[0013] Preferably, the enable terminal detection circuit further includes a third resistor, one end of the third resistor is electrically connected to the enable input terminal, and the other end of the third resistor is grounded.

[0014] Preferably, the error reporting circuit comprises a MOS tube, a gate of the MOS tube is electrically connected to the signal output end of the logic control unit, a drain of the MOS tube is electrically connected to the fault protection output end, and a source of the MOS tube is grounded.

[0015] Preferably, the charging formula of the charging circuit is:

[0016] V t =V 0 +(V u -V 0 )[1-exp(-t / RC)]

[0017] Among them, the V t is the voltage value across the capacitor at any time, the V u is the voltage value when the capacitor is fully charged, the V 0 is the initial voltage value across the capacitor, R is the resistance value of the fourth resistor, and C is the capacitance value of the capacitor.

[0018] Compared with the prior art, the beneficial technical effects of the embodiments of the present invention are:

[0019] The semiconductor circuit proposed in the present invention can realize the undervoltage protection voltage rising according to the working time. When the work starts, the undervoltage protection voltage is low, and the undervoltage protection voltage rises after the work is stable. This avoids the situation that when the HVIC is used, if its power supply VCC is shared with other electronic components, the undervoltage protection of the intelligent power module is triggered when the system is gradually started and the operation is not stable, thereby causing the system to fail to start. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a circuit diagram of a semiconductor circuit in one embodiment of the present invention;

[0021] Figure 2 for Figure 1 Circuit diagram of the undervoltage detection unit in the embodiment. DETAILED DESCRIPTION

[0022] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, but are not to be construed as limiting the present invention. All other embodiments obtained by ordinary technicians in the field without creative work based on the embodiments of the present invention are within the scope of protection of the present invention.

[0023] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0024] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0025] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0026] The semiconductor circuit mentioned in the present invention is a circuit module that integrates power switching devices and high-voltage drive circuits, and is sealed and packaged on the outside. It is widely used in the field of power electronics, such as frequency converters for driving motors, various inverter voltages, variable frequency speed regulation, metallurgical machinery, electric traction, variable frequency home appliances and other fields. The semiconductor circuit here has many other names, such as Modular Intelligent Power System (MIPS), Intelligent Power Module (IPM), or hybrid integrated circuits, power semiconductor modules, power modules and other names. In the following embodiments of the present invention, they are collectively referred to as Modular Intelligent Power System (MIPS).

[0027] Embodiment 1

[0028] See also Figure 1-2 The embodiment of the present invention provides a modular intelligent power system, which includes a circuit board 10 and a high-voltage integrated circuit. The high-voltage integrated circuit includes a power undervoltage protection circuit 20, an inverter bridge drive circuit 30 and an error reporting circuit 40. The power undervoltage protection circuit 20 includes an undervoltage detection unit 21 and a fault logic control unit 22. The signal input end of the fault logic control unit 22 is electrically connected to the undervoltage detection unit 21, and the signal output end of the fault logic control unit 22 is electrically connected to the inverter bridge drive circuit 30 and the error reporting circuit 40 respectively.

[0029] The undervoltage detection unit 21 includes a diode D, a fourth resistor R, a capacitor C and a comparator X. The diode D, the fourth resistor R and the capacitor C form a charging circuit. The positive electrode of the diode D is electrically connected to the power supply VCC, the negative electrode of the diode D is electrically connected to one end of the fourth resistor R, the other end of the fourth resistor R is electrically connected to one end of the capacitor C and to the inverting input terminal In2 of the comparator X, the same-direction input terminal In1 of the comparator X is electrically connected to the power supply VCC, and the output end of the comparator X is electrically connected to the fault logic control unit 22.

[0030] In this embodiment, the high-voltage integrated circuit is used as a driving chip inside the modular intelligent power system to generate an inverter bridge driving signal to drive the inverter bridge to work. The high-voltage integrated circuit is arranged on the circuit board 10, which includes a power supply undervoltage protection circuit 20, an inverter bridge driving circuit 30 and an error reporting circuit 40. The power supply undervoltage protection circuit 20 is used for power supply VCC undervoltage protection. When the power supply VCC voltage is lower than the undervoltage protection value, the power supply undervoltage protection circuit 20 is started to protect the modular intelligent power system. After the power supply undervoltage protection circuit 20 is started, an error is reported through the error reporting circuit 40 to remind the staff that the modular intelligent power system is running wrong.

[0031] When the modular intelligent power system is started, the power supply VCC is shared between the electronic components, and the power supply VCC voltage may be disturbed and fluctuate, which may cause the power supply VCC voltage to be lower than the undervoltage protection value. When it is lower than the undervoltage protection value, the power undervoltage protection circuit 20 will be activated, resulting in the failure of the modular intelligent power system to start. In other words, the undervoltage protection value set by the existing power undervoltage protection circuit 20 is a fixed value. If the above situation occurs, the modular intelligent power system will fail to start.

[0032] Based on this, the present embodiment proposes a power undervoltage protection circuit 20 whose undervoltage protection value can be dynamically changed according to the working time. The power undervoltage protection circuit 20 proposed in the present embodiment includes a charging circuit and a comparator X, the charging circuit includes a diode D, a resistor R and a capacitor C, the same-direction input terminal In1 of the comparator X is electrically connected to the power supply VCC, the reverse input terminal In2 of the comparator X is electrically connected to the charging circuit, the output terminal of the comparator X is electrically connected to the fault logic control unit 22, and the comparator X is used to compare the voltage of the power supply VCC and the voltage across the capacitor C, and output a corresponding level signal according to the comparison result.

[0033] The voltage across the capacitor C is the undervoltage protection value of the power supply VCC undervoltage circuit. When powered on, the power supply VCC voltage gradually charges the capacitor C. During the charging process, the voltage across the capacitor C gradually increases. This is a dynamic change process rather than a fixed value. Therefore, it can avoid power supply VCC fluctuations caused by the electronic components sharing the power supply VCC during startup, which may trigger the power supply undervoltage protection circuit 20 and cause the system to fail to start.

[0034] Among them, the diode D is used to prevent the voltage of the capacitor C from being released when the power supply VCC voltage drops. In the process of charging the capacitor C with the power supply VCC voltage, the voltage across the capacitor C will gradually increase and reach the stable voltage value of the capacitor C. In the subsequent process, in order to prevent the voltage across the capacitor C from being released when the power supply VCC voltage drops, a diode D is electrically connected to one end of the resistor R. The positive electrode of the diode D is electrically connected to the power supply VCC, and the negative electrode of the diode D is electrically connected to the resistor R. Based on the forward conduction and reverse cutoff characteristics of the diode D, the voltage across the capacitor C cannot be output in the reverse direction.

[0035] In the subsequent operation process, if the power supply VCC voltage drops, the comparator X can detect and determine whether the power supply VCC voltage drops to a stable voltage value lower than the capacitor C. If so, the fault logic control unit 22 locks the operation of the inverter bridge and controls the operation of the error reporting circuit 40 to trigger fault protection; if not, it runs normally.

[0036] The working principle of the power undervoltage protection circuit 20 proposed in the embodiment of the present invention is:

[0037] When the power supply VCC voltage input to the same-direction input terminal In1 of the comparator X is greater than the capacitor C voltage input to the reverse input terminal In2 of the comparator X (i.e., the undervoltage protection value), the output terminal of the comparator X outputs a high-level signal to the fault logic control unit 22, and the modular intelligent power system operates normally;

[0038] When the power supply VCC voltage input to the non-inverting input terminal In1 of the comparator X is less than the capacitor C voltage input to the reverse input terminal In2 of the comparator X (i.e., the undervoltage protection value), the output terminal of the comparator X outputs a low-level signal to the fault logic control unit 22, and then outputs a high-level signal through the fault logic control unit 22. When the fault logic control unit 22 is at a high level, no matter whether the upper and lower bridge driving signals are at a high level or a low level, they are locked, and the corresponding signal output terminal is a low-level signal. At the same time, the high-level signal output by the fault logic control unit 22 drives the error reporting circuit 40 to operate.

[0039] Embodiment 2

[0040] See also Figure 1The power undervoltage protection circuit 20 proposed in the embodiment of the present invention further includes a first Schmitt trigger 23 and a first filter 24. The first Schmitt trigger 23, the first filter 24 and the undervoltage detection unit 21 are electrically connected in sequence. The first Schmitt trigger 23 is used to perform waveform correction on the electrical signal, and the first filter 24 is used to filter out noise in the electrical signal. In this embodiment, the input electrical signal may be a circular wave, a triangular wave, etc. In order to correct the input electrical signal into a square wave, a first Schmitt trigger 23 is provided in the power undervoltage protection circuit 20. After correction by the first Schmitt trigger 23, noise may also be mixed in the electrical signal. For this reason, a first filter 24 is also provided in the power undervoltage protection circuit 20 to filter out noise in the electrical signal through the first filter 24. Among them, one end of the first Schmitt trigger 23 is electrically connected to the power supply VCC, and the other end is electrically connected to one end of the first filter 24. The other end of the first filter 24 is electrically connected to the undervoltage detection unit 21 to input the corrected and filtered electrical signal into the undervoltage detection unit 21.

[0041] Embodiment 3

[0042] See also Figure 1 The power undervoltage protection circuit 20 proposed in the embodiment of the present invention also includes a first resistor 25, one end of the first resistor 25 is electrically connected to the power supply VCC, and the other end of the first resistor 25 is grounded. In this embodiment, the first resistor 25 is a pull-down resistor. When there is no input electrical signal, if it is interfered by an external electrical signal, the electrical signal can be pulled down to a low level through the first resistor 25 to avoid false triggering of the inverter bridge. It should be noted that the power devices such as MOS tubes included in the inverter bridge are all high-level triggered, that is, when a high-level signal is received, an action will be triggered, and if a low-level signal is received, the corresponding action will not be triggered.

[0043] Embodiment 4

[0044] See also Figure 1The high-voltage integrated circuit proposed in the embodiment of the present invention also includes an overcurrent protection circuit 50. The overcurrent protection circuit 50 includes a second Schmitt trigger 51, a second filter 52 and a first level converter 53 which are electrically connected in sequence. The first level converter 53 is also electrically connected to the fault logic control unit 22. The second Schmitt trigger 51 is used to perform waveform correction on the electrical signal, and the second filter 52 is used to filter out noise in the electrical signal. In this embodiment, the input electrical signal may be a circular wave, a triangular wave, etc. In order to correct the input electrical signal into a square wave, a second Schmitt trigger 51 is provided in the overcurrent protection circuit 50. After correction by the second Schmitt trigger 51, the electrical signal may also be mixed with noise. For this reason, a second filter 52 is also provided in the overcurrent protection circuit 50 to filter out noise in the electrical signal through the second filter 52. After filtering, the electrical signal is processed into a voltage range that can be detected by the fault logic control unit 22 through the first level converter 53, so that the fault logic control unit 22 can judge whether the modular intelligent power system has a fault based on this. Among them, one end of the second Schmitt trigger 51 is electrically connected to the overcurrent signal detection input end, and the other end is electrically connected to one end of the second filter 52. The other end of the second filter 52 is electrically connected to one end of the first level converter 53, and the other end of the first level converter 53 is electrically connected to the fault logic control unit 22.

[0045] Embodiment 5

[0046] See also Figure 1 , the overcurrent protection circuit 50 proposed in the embodiment of the present invention also includes a second resistor 54, one end of the second resistor 54 is electrically connected to the overcurrent signal detection input terminal, and the other end of the second resistor 54 is grounded. In this embodiment, the second resistor 54 is a pull-down resistor. When there is no input electrical signal, if it is interfered by an external electrical signal, the electrical signal can be pulled down to a low level through the second resistor 54 to avoid false triggering of the inverter bridge. It should be noted that the power devices such as MOS tubes included in the inverter bridge are all high-level triggered, that is, when a high-level signal is received, an action will be triggered, and if a low-level signal is received, the corresponding action will not be triggered.

[0047] Embodiment 6

[0048] See also Figure 1The high-voltage integrated circuit proposed in the embodiment of the present invention further includes an enable end detection circuit 60, which includes a third Schmitt trigger 61, a third filter 62 and a second level converter 63 which are electrically connected in sequence. The second level converter 63 is also electrically connected to the fault logic control unit 22. The third Schmitt trigger 61 is used to perform waveform correction on the electrical signal, and the third filter 62 is used to filter out noise in the electrical signal. In this embodiment, the input electrical signal may be a circular wave, a triangular wave, etc. In order to correct the input electrical signal into a square wave, a third Schmitt trigger 61 is provided in the enable end detection circuit 60. After correction by the third Schmitt trigger 61, the electrical signal may still be mixed with noise. For this reason, a third filter 62 is also provided in the enable end detection circuit 60 to filter out noise in the electrical signal through the third filter 62. After filtering, the electrical signal is processed into a voltage range that can be detected by the fault logic control unit 22 through the second level converter 63, so that the fault logic control unit 22 can judge whether the modular intelligent power system has a fault based on this. Among them, one end of the third Schmitt trigger 61 is electrically connected to the enable input end, and the other end is electrically connected to one end of the third filter 62. The other end of the third filter 62 is electrically connected to one end of the second level converter 63. The other end of the second level converter 63 is electrically connected to the fault logic control unit 22.

[0049] Embodiment 7

[0050] See also Figure 1 , the enable terminal detection circuit 60 proposed in the embodiment of the present invention also includes a third resistor 64, one end of the third resistor 64 is electrically connected to the enable input terminal, and the other end of the third resistor 64 is grounded. In this embodiment, the third resistor 64 is a pull-down resistor. When there is no input electrical signal, if it is interfered by an external electrical signal, the electrical signal can be pulled down to a low level through the third resistor 64 to avoid false triggering of the inverter bridge. It should be noted that the power devices such as MOS tubes included in the inverter bridge are all high-level triggered, that is, when a high-level signal is received, an action will be triggered, and if a low-level signal is received, the corresponding action will not be triggered.

[0051] Embodiment 8

[0052] See also Figure 1The error reporting circuit 40 proposed in the embodiment of the present invention includes a MOS transistor 41, the gate of the MOS transistor 41 is electrically connected to the signal output terminal of the logic control unit, the drain of the MOS transistor 41 is electrically connected to the fault protection output terminal, and the source of the MOS transistor 41 is grounded. In this embodiment, when the fault logic control unit 22 outputs a high-level signal, the MOS transistor 41 is turned on and outputs a low-level signal through the fault protection output terminal. The external MCU detects the low-level signal output by the fault protection output terminal, triggers the fault protection, and the driving signal of each channel is set to a low level.

[0053] Embodiment 9

[0054] The charging formula of the charging circuit proposed in the embodiment of the present invention is:

[0055] V t =V 0 +(V u -V 0 )[1-exp(-t / RC)]

[0056] Among them, V t is the voltage across capacitor C at any time, V u is the voltage value when the capacitor C is fully charged, V 0 is the initial voltage value across the capacitor C, R is the resistance value of the fourth resistor R, and C is the capacitance value of the capacitor C.

[0057] In this embodiment, the charging speed of the capacitor C is determined by the resistance value of the fourth resistor R. The larger the resistance value of the fourth resistor R, the slower the charging speed of the capacitor C. When the modular intelligent power system is just powered on, the voltage across the capacitor C is low, that is, the undervoltage protection value is low, and as the expected stable voltage value is gradually filled, the undervoltage protection value increases, thus achieving the purpose of dynamically changing the undervoltage protection value of the power supply VCC undervoltage circuit during the operation startup phase, avoiding the problem of power supply VCC voltage fluctuations caused by the common power supply VCC of various electronic components, which causes the modular intelligent power system to fail to start.

[0058] The above are only partial or preferred embodiments of the present invention. Neither the text nor the drawings can limit the scope of protection of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the overall concept of the present invention, or direct / indirect application in other related technical fields are included in the scope of protection of the present invention.

Claims

1. A semiconductor circuit, characterized in that: It includes a circuit board and a high-voltage integrated circuit, wherein the high-voltage integrated circuit includes a power supply undervoltage protection circuit, an inverter bridge drive circuit and an error reporting circuit, wherein the power supply undervoltage protection circuit includes an undervoltage detection unit and a fault logic control unit, wherein the signal input end of the fault logic control unit is electrically connected to the undervoltage detection unit, and the signal output end of the fault logic control unit is electrically connected to the inverter bridge drive circuit and the error reporting circuit respectively; The undervoltage detection unit includes a diode, a fourth resistor, a capacitor and a comparator. The diode, the fourth resistor and the capacitor form a charging circuit. The positive electrode of the diode is electrically connected to the power supply, the negative electrode of the diode is electrically connected to one end of the fourth resistor, the other end of the fourth resistor is electrically connected to one end of the capacitor and to the inverting input end of the comparator, the same-direction input end of the comparator is electrically connected to the power supply, and the output end of the comparator is electrically connected to the fault logic control unit.

2. The semiconductor circuit according to claim 1, characterized in that The power supply undervoltage protection circuit also includes a first Schmitt trigger and a first filter. The first Schmitt trigger, the first filter and the undervoltage detection unit are electrically connected in sequence. The first Schmitt trigger is used to perform waveform correction on the electrical signal, and the first filter is used to filter out noise in the electrical signal.

3. The semiconductor circuit according to claim 2, characterized in that The power supply undervoltage protection circuit further includes a first resistor, one end of which is electrically connected to the power supply, and the other end of which is grounded.

4. The semiconductor circuit according to claim 1, wherein: The high-voltage integrated circuit also includes an overcurrent protection circuit, which includes a second Schmitt trigger, a second filter and a first level converter electrically connected in sequence, the first level converter is also electrically connected to the fault logic control unit, the second Schmitt trigger is used to perform waveform correction on the electrical signal, and the second filter is used to filter out noise in the electrical signal.

5. The semiconductor circuit according to claim 4, characterized in that The overcurrent protection circuit further includes a second resistor, one end of the second resistor is electrically connected to the overcurrent signal detection input end, and the other end of the second resistor is grounded.

6. The semiconductor circuit according to claim 1, wherein: The high-voltage integrated circuit also includes an enable end detection circuit, which includes a third Schmitt trigger, a third filter and a second level converter electrically connected in sequence, the second level converter is also electrically connected to the fault logic control unit, the third Schmitt trigger is used to perform waveform correction on the electrical signal, and the third filter is used to filter out noise in the electrical signal.

7. The semiconductor circuit according to claim 6, characterized in that The enable terminal detection circuit further includes a third resistor, one end of the third resistor is electrically connected to the enable input terminal, and the other end of the third resistor is grounded.

8. The semiconductor circuit according to claim 1, wherein: The error reporting circuit comprises a MOS tube, a gate of the MOS tube is electrically connected to a signal output terminal of the logic control unit, a drain of the MOS tube is electrically connected to a fault protection output terminal, and a source of the MOS tube is grounded.

9. The semiconductor circuit according to any one of claims 1 to 8, characterized in that: The charging formula of the charging circuit is: V t =V0+(V u ―V0)[1―exp(―t / RC)] Among them, the V t is the voltage value across the capacitor at any time, the V u is the voltage value when the capacitor is fully charged, V0 is the initial voltage value across the capacitor, R is the resistance value of the fourth resistor, and C is the capacitance value of the capacitor.

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