CN114142430A - High voltage integrated circuit - Google Patents
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
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Abstract
The invention relates to a high-voltage integrated circuit, comprising an undervoltage protection circuit and a fault logic control circuit; the undervoltage protection circuit comprises a comparator, a reference power supply, a first resistor, a first interface, a second interface and a first variable resistor; the output end of the comparator is connected to the input end of the fault logic control circuit, and the output end of the fault logic control circuit is used for being connected to an external processor; the positive end of the reference power supply is connected with a first input port of the comparator, the negative end of the reference power supply is grounded, and a second input port of the comparator is connected to the undervoltage monitoring point through a first resistor; the second input port of the comparator is also connected to the first interface, and the second interface is grounded; the first end of the first variable resistor is connected with the first interface, and the second end of the first variable resistor is connected with the second interface. The high-voltage integrated circuit can realize the flexible adjustment of the undervoltage protection threshold value, meet the complex undervoltage protection requirement in the circuit under the condition of lower cost, and improve the stability and the reliability of the operation of the circuit.
Description
Technical Field
The invention relates to a high-voltage integrated circuit, and belongs to the technical field of semiconductor circuit application.
Background
A high Voltage Integrated circuit (hvic) is an Integrated circuit product for converting an MCU signal into a driving signal for driving a switching tube such as an IGBT. Generally, the HVIC integrates various basic devices such as a switching tube, a diode, a voltage regulator tube, a resistor, a capacitor, etc. to form a driving circuit, a pulse generating circuit, a delay circuit, a filter circuit, an overcurrent protection circuit, an overheat protection circuit, an undervoltage protection circuit, a bootstrap circuit, etc. When the HVIC works, on one hand, the HVIC receives a control signal of the external processor and drives a subsequent switching tube to work, and on the other hand, the HVIC also sends a related working state detection signal back to the external processor so as to realize the control of the working condition of the circuit.
In the related art, an under-voltage protection circuit is integrated in a high-voltage integrated circuit and used for performing under-voltage protection on the circuit. Under-voltage protection refers to the protection action of a circuit under the condition that the working voltage of some devices does not reach the expected level when a product works. For example, a device is rated to be powered by a 15V power supply, and if the power supply voltage is lower than 12.5V (a typical value), undervoltage protection occurs. At the moment, the high-voltage integrated circuit locks the gate driving circuit and outputs a fault signal through the fault logic control circuit so that the external processor cuts off the module to work. However, the set undervoltage comparison threshold in the current high-voltage integrated circuit is often single, and only a fixed voltage level can be detected, which is difficult to adapt to a complex application environment.
In summary, there is a need to solve the technical problems in the related art.
Disclosure of Invention
The invention aims to solve the technical problems that the undervoltage comparison threshold value in the existing semiconductor circuit is often single, only a fixed voltage level can be detected, and the existing semiconductor circuit is difficult to adapt to a series of problems caused by a complex application environment.
Specifically, the present invention discloses a high voltage integrated circuit, comprising:
the undervoltage protection circuit and the fault logic control circuit;
the undervoltage protection circuit comprises a comparator, a reference power supply, a first resistor, a first interface, a second interface and a first variable resistor;
the output end of the comparator is connected to the input end of the fault logic control circuit, and the output end of the fault logic control circuit is used for being connected to an external processor; the positive end of the reference power supply is connected with the first input port of the comparator, the negative end of the reference power supply is grounded, and the second input port of the comparator is connected to the undervoltage monitoring point through the first resistor; the second input port of the comparator is also connected to the first interface, and the second interface is grounded; the first end of the first variable resistor is connected with the first interface, and the second end of the first variable resistor is connected with the second interface.
Optionally, the high voltage integrated circuit further includes a first switch tube, a second resistor, and a third interface, the control end of the first switch tube is connected to the fault logic control circuit, the second interface is grounded through the first switch tube, the third interface is grounded, the first end of the second resistor is connected to the second interface, and the second end of the second resistor is connected to the third interface.
Optionally, the second resistance is a variable resistance.
Optionally, the first switch tube comprises any one of a gate turn-off thyristor, a power transistor, a metal oxide semiconductor field effect transistor, and an insulated gate bipolar transistor.
The invention also discloses another high voltage integrated circuit, comprising:
the undervoltage protection circuit and the fault logic control circuit;
the undervoltage protection circuit comprises a comparator, a constant current power supply, a third resistor, a fourth interface, a fifth interface and a second variable resistor;
the output end of the comparator is connected to the input end of the fault logic control circuit, and the output end of the fault logic control circuit is used for being connected to an external processor; the output end of the constant current power supply is connected to the first input port of the comparator, the output end of the constant current power supply is further connected to the fourth interface, the fifth interface is grounded, the first end of the third resistor is connected to the undervoltage monitoring point, the second end of the third resistor is connected to the second input port of the comparator, and the second end of the third resistor is further grounded through the fourth resistor.
Optionally, the high-voltage integrated circuit further includes an MOS transistor and a fifth resistor, a gate of the MOS transistor is connected to the fault logic control circuit, a second end of the fourth resistor is grounded through the fifth resistor, and the MOS transistor is connected in parallel with the fifth resistor.
Optionally, at least one of the third resistor, the fourth resistor, or the fifth resistor is a variable resistor.
The invention also discloses another high voltage integrated circuit, comprising:
the undervoltage protection circuit and the fault logic control circuit;
the undervoltage protection circuit comprises a comparator, a reference power supply, a sixth resistor, a seventh resistor, a decoder and a second switching tube;
the output end of the comparator is connected to the input end of the fault logic control circuit, and the output end of the fault logic control circuit is used for being connected to an external processor; the first input port of the comparator is connected with the positive terminal of the reference power supply, and the negative terminal of the reference power supply is grounded; a second input port of the comparator is connected to an under-voltage monitoring point through the sixth resistor, the second input port of the comparator is also connected to a first end of the seventh resistor, and a second end of the seventh resistor is grounded; the input end of the decoder is used for being connected to an external processor, the output end of the decoder is connected with the control end of the second switch tube, and the second switch tube is connected with the seventh resistor in parallel.
Optionally, the under-voltage protection circuit includes multiple sets of the seventh resistor and the second switch tube, the seventh resistors of each set are connected in series, and the second switch tube and the seventh resistor in each set are connected in parallel.
Optionally, the high voltage integrated circuit further includes an MOS transistor and an eighth resistor, a gate of the MOS transistor is connected to the fault logic control circuit, the seventh resistor is grounded through the eighth resistor, and the MOS transistor and the eighth resistor are connected in parallel.
The invention discloses a high-voltage integrated circuit, which comprises an undervoltage protection circuit and a fault logic control circuit; the undervoltage protection circuit comprises a comparator, a reference power supply, a first resistor, a first interface, a second interface and a first variable resistor; the output end of the comparator is connected to the input end of the fault logic control circuit, and the output end of the fault logic control circuit is used for being connected to an external processor; the positive end of the reference power supply is connected with a first input port of the comparator, the negative end of the reference power supply is grounded, and a second input port of the comparator is connected to the undervoltage monitoring point through a first resistor; the second input port of the comparator is also connected to the first interface, and the second interface is grounded; the first end of the first variable resistor is connected with the first interface, and the second end of the first variable resistor is connected with the second interface. The high-voltage integrated circuit can realize the flexible adjustment of the undervoltage protection threshold value, meet the complex undervoltage protection requirement in the circuit under the condition of lower cost, and improve the stability and the reliability of the operation of the circuit.
Drawings
FIG. 1 is a diagram of a high voltage integrated circuit of the related art;
fig. 2 is a schematic circuit diagram of a high voltage integrated circuit according to a first embodiment of the present invention;
fig. 3 is another schematic circuit diagram of a high voltage integrated circuit according to a first embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of a high voltage integrated circuit according to a second embodiment of the present invention;
FIG. 5 is another schematic circuit diagram of a high voltage integrated circuit according to a second embodiment of the present invention;
fig. 6 is a schematic circuit diagram of a high voltage integrated circuit according to a third embodiment of the present invention;
fig. 7 is another schematic circuit diagram of a high voltage integrated circuit according to a third embodiment of the present invention.
Detailed Description
It is to be noted that the embodiments and features of the embodiments may be combined with each other without conflict in structure or function. The present invention will be described in detail below with reference to examples.
A high Voltage Integrated circuit (hvic) is an Integrated circuit product for converting an MCU signal into a driving signal for driving a switching tube such as an IGBT. Generally, the HVIC integrates various basic devices such as a switching tube, a diode, a voltage regulator tube, a resistor, a capacitor, etc. to form a driving circuit, a pulse generating circuit, a delay circuit, a filter circuit, an overcurrent protection circuit, an overheat protection circuit, an undervoltage protection circuit, a bootstrap circuit, etc. When the HVIC works, on one hand, the HVIC receives a control signal of the external processor and drives a subsequent switching tube to work, and on the other hand, the HVIC also sends a related working state detection signal back to the external processor so as to realize the control of the working condition of the circuit.
The high-voltage integrated circuit can be generally applied to a semiconductor circuit, and the semiconductor circuit provided by the invention is a circuit module which integrates a power switch device, the high-voltage integrated circuit and the like together and is hermetically packaged on the outer surface, and is widely applied to the field of power electronics, such as the fields of frequency converters of driving motors, various inverter voltages, variable frequency speed regulation, metallurgical machinery, electric traction, variable frequency household appliances and the like. The semiconductor circuit herein may be referred to by various other names, such as Modular Intelligent Power System (MIPS), Intelligent Power Module (IPM), or hybrid integrated circuit, Power semiconductor Module, Power Module, etc.
Specifically, referring to fig. 1, fig. 1 shows a schematic diagram of a high-voltage integrated circuit in the related art, in fig. 1, a power supply terminal VCC of the high-voltage integrated circuit may be used as a low-voltage side power supply positive terminal VDD of a semiconductor circuit, a voltage at VDD is generally 15V, and the high-voltage integrated circuit generally includes six signal input terminals for receiving upper and lower bridge arm PWM control signals output by a peripheral processor. The first upper bridge arm signal input end HIN1, the second upper bridge arm signal input end HIN2 and the third upper bridge arm signal input end HIN3 can be used as a U-phase upper bridge arm signal input end UHIN, a V-phase upper bridge arm signal input end VHIN and a W-phase upper bridge arm signal input end WHIN of the semiconductor circuit respectively; similarly, the first lower bridge arm signal input terminal LIN1, the second lower bridge arm signal input terminal LIN2 and the third lower bridge arm signal input terminal LIN3 of the high-voltage integrated circuit can be respectively used as a U-phase lower bridge arm signal input terminal ULIN, a V-phase lower bridge arm signal input terminal VLIN and a W-phase lower bridge arm signal input terminal WLIN of the semiconductor circuit.
Generally, the voltage ranges of input signals of a first upper bridge arm signal input end HIN1, a second upper bridge arm signal input end HIN2, a third upper bridge arm signal input end HIN3, a first lower bridge arm signal input end LIN1, a second lower bridge arm signal input end LIN2 and a third lower bridge arm signal input end LIN3 of the high-voltage integrated circuit can be 0-5V; a first power supply positive end VB1 of the high-voltage integrated circuit is used as a positive end UVB of a U-phase high-voltage side power supply end of the semiconductor circuit, a high-voltage side control output end HO1 of the high-voltage integrated circuit is used for outputting a driving signal for driving a U-phase upper bridge arm switching tube, a first power supply negative end VS1 end of the high-voltage integrated circuit is used as a negative end UVS of the U-phase high-voltage side power supply end of the semiconductor circuit, and the filter capacitor can be connected between the positive end UVB of the U-phase high-voltage side power supply end of the semiconductor circuit and the negative end UVS of the U-phase high-voltage side power supply end of the semiconductor circuit; a second power supply positive end VB2 of the high-voltage integrated circuit is used as a positive end VVB of a V-phase high-voltage side power supply end of the semiconductor circuit, a high-voltage side control output end HO2 of the high-voltage integrated circuit is used for outputting a driving signal for driving a V-phase upper bridge arm switching tube, a second power supply negative end VS2 end of the high-voltage integrated circuit is used as a negative end VVS of the V-phase high-voltage side power supply end of the semiconductor circuit, and the filter capacitor can be connected between the positive end VVB of the V-phase high-voltage side power supply end of the semiconductor circuit and the negative end VVS of the V-phase high-voltage side power supply end of the semiconductor circuit; the third power supply positive end VB3 of the high-voltage integrated circuit is used as the positive end WVB of the W-phase high-voltage side power supply end of the semiconductor circuit, the high-voltage side control output end HO3 of the high-voltage integrated circuit is used for outputting a driving signal for driving the W-phase upper bridge arm switching tube, the third power supply negative end VS3 of the high-voltage integrated circuit is used as the negative end WVS of the W-phase high-voltage side power supply end of the semiconductor circuit, and the filter capacitor can be connected between the positive end WVB of the W-phase high-voltage side power supply end of the semiconductor circuit and the negative end WVS of the W-phase high-voltage side power supply end of the semiconductor circuit.
In the semiconductor circuit, the high-voltage integrated circuit is used for transmitting 0-5V logic signals received by the HIN1, the HIN2, the HIN3, the LIN1, the LIN2 and the LIN3 to the HO1, the HO2, the HO3, the LO1, the LO2 and the LO3 respectively so as to control the work of the switching tube assembly and achieve the purpose of driving. The HO1, HO2 and HO3 output logic signals of VS-VS +15V, and the LO1, LO2 and LO3 output logic signals of 0-15V; input signals of the same phase cannot be at high level at the same time, that is, input signals of the first upper bridge arm signal input end HIN1 and the first lower bridge arm signal input end LIN1 cannot be at high level at the same time, input signals of the second upper bridge arm signal input end HIN2 and the second lower bridge arm signal input end LIN2 cannot be at high level at the same time, and input signals of the third upper bridge arm signal input end HIN3 and the third lower bridge arm signal input end LIN3 cannot be at high level at the same time. Therefore, an interlock circuit may be generally provided between the high-voltage side drive circuit and the low-voltage side drive circuit.
In order to improve the stability and reliability of the circuit operation, an overcurrent protection circuit, an overheat protection circuit, an undervoltage protection circuit, an overvoltage protection circuit and the like are generally arranged in the high-voltage integrated circuit, the circuits are respectively used for detecting various working condition signals of the high-voltage integrated circuit, such as signals of current, temperature or voltage and the like, when a preset signal threshold is reached, a protection signal is triggered through a trigger, the protection signal is input into a FAULT logic control circuit, the FAULT logic control circuit is generally used for outputting an Enable signal and a FAULT signal, wherein the Enable signal is used for controlling the working condition of a switching tube of the semiconductor circuit, and the FAULT signal is used for returning to an external processor so as to realize the working condition control of the high-voltage integrated circuit. Specifically, in general, when the Enable signal is a high level signal, the upper and lower bridge drive signals of the semiconductor circuit are locked regardless of the high and low levels; when the FAULT signal is a low level signal, the external processor detects the FAULT low level signal to trigger FAULT protection, for example, to disconnect the power supply of the high voltage integrated circuit, so as to protect the high voltage integrated circuit.
As mentioned above, the high-voltage integrated circuit is internally integrated with an under-voltage protection circuit for performing under-voltage protection on the circuit. Under-voltage protection refers to the protection action of a circuit under the condition that the working voltage of some devices does not reach the expected level when a product works. For example, a device is rated to be powered by a 15V power supply, and if the power supply voltage is lower than 12.5V (a typical value), undervoltage protection occurs. At the moment, the high-voltage integrated circuit locks the gate driving circuit and outputs a fault signal through the fault logic control circuit so that the external processor cuts off the module to work. However, the set undervoltage comparison threshold in the current high-voltage integrated circuit is often single, and only a fixed voltage level can be detected, which is difficult to adapt to a complex application environment.
Therefore, an embodiment of the present invention provides a high voltage integrated circuit, referring to fig. 2, the high voltage integrated circuit mainly includes:
an undervoltage protection circuit and fault logic control circuit 101;
the undervoltage protection circuit comprises a comparator 102, a reference power supply V1, a first resistor R1, a first interface A, a second interface B and a first variable resistor RX 1;
the output end of the comparator 102 is connected to the input end of the fault logic control circuit 101, and the output end of the fault logic control circuit 101 is used for being connected to an external processor; the positive terminal of the reference power supply V1 is connected to the first input port of the comparator 102, the negative terminal of the reference power supply V1 is grounded, and the second input port of the comparator 102 is connected to the undervoltage monitoring point VCC through the first resistor R1; the second input port of the comparator 102 is further connected to the first interface a, and the second interface B is grounded; the first end of the first variable resistor RX1 is connected to the first interface A, and the second end of the first variable resistor RX1 is connected to the second interface B.
In the embodiment of the application, a high-voltage integrated circuit with a variable voltage threshold for triggering an under-voltage protection function is provided. In the high-voltage integrated circuit, the undervoltage protection circuit includes a comparator 102, and the comparator 102 is configured to output a corresponding level signal by comparing a set reference voltage with a voltage value detected at an undervoltage monitoring point VCC, so that the fault logic control circuit 101 triggers undervoltage protection or maintains a working state. For example, in some specific embodiments, the positive input terminal of the comparator 102 may be directly or indirectly connected to the under-voltage monitoring point VCC, and the negative input terminal of the comparator 102 may be connected to the reference power supply V1, so that when the voltage at the under-voltage monitoring point VCC is at a higher level, the output terminal of the comparator 102 outputs a high level signal, and the FAULT logic control circuit 101 does not trigger the under-voltage protection function, i.e., does not output a FAULT low level signal; on the contrary, when the voltage at the undervoltage monitoring point VCC is at a lower level, the output end of the comparator 102 outputs a low level signal, the FAULT logic control circuit 101 triggers the undervoltage protection function, that is, outputs a FAULT low level signal, and at this time, the external processor receives the FAULT low level signal from the FAULT logic control circuit 101 and can trigger the undervoltage protection, for example, the power supply of the high-voltage integrated circuit can be disconnected, so as to protect the high-voltage integrated circuit.
In other specific embodiments, the positive input terminal of the comparator 102 may be connected to the reference power supply V1, and the negative input terminal of the comparator 102 may be directly or indirectly connected to the under-voltage monitoring point VCC, so that when the voltage at the under-voltage monitoring point VCC is at a higher level, the output terminal of the comparator 102 outputs a low level signal, and the FAULT logic control circuit 101 does not trigger the under-voltage protection function, i.e., does not output a FAULT low level signal; on the contrary, when the voltage at the undervoltage monitoring point VCC is at a lower level, the output end of the comparator 102 outputs a high level signal, the FAULT logic control circuit 101 triggers the undervoltage protection function, that is, outputs a FAULT low level signal, and at this time, the external processor receives the FAULT low level signal from the FAULT logic control circuit 101 and can trigger the undervoltage protection.
In the embodiment of the present application, the specific line connected to the positive and negative input terminals of the comparator 102 is not limited, and may be set according to the above implementation principle. In the embodiment shown in fig. 2, the positive input terminal of the comparator 102 is used as the second input port and is connected to the undervoltage monitoring point VCC through the first resistor R1, and the negative input terminal of the comparator 102 is used as the first input port and is grounded through the reference power supply V1. At this time, the voltage at the undervoltage monitoring point VCC minus the voltage drop at the first resistor R1 is used as the input voltage of the positive input terminal of the comparator 102, and is compared with the voltage of the reference power supply V1, so as to determine whether the undervoltage monitoring point VCC has an excessively low voltage. In this embodiment, the second input port of the comparator 102 is further connected to the first interface a, the second interface B is grounded, a first variable resistor RX1 is arranged between the first interface a and the second interface B, so, a line of the first resistor R1 and the first variable resistor RX1 can be formed between the undervoltage monitoring point VCC and the ground point, the first variable resistor RX1 changes its own resistance value, and can correspondingly adjust the voltage drop on the first resistor R1, and also adjust the voltage input from the undervoltage monitoring point VCC to the positive input end of the comparator 102, so that the trigger voltage threshold of the undervoltage protection can be adjusted. For different under-voltage protection requirements, the application requirements can be flexibly met by adjusting the resistance value of the first variable resistor RX 1.
In some embodiments, referring to fig. 3, the high voltage integrated circuit of the present application may further include: the control circuit comprises a first switch tube Q1, a second resistor R2 and a third interface C, wherein the control end of the first switch tube Q1 is connected to the fault logic control circuit 101, the second interface B is grounded through the first switch tube Q1, the third interface C is grounded, the first end of the second resistor R2 is connected to the second interface B, and the second end of the second resistor R2 is connected to the third interface C.
In the embodiment of the application, a retention loop can be further arranged in the undervoltage protection circuit. Specifically, a first switch tube Q1, a second resistor R2 and a third interface C may be provided, the first variable resistor RX1 in the foregoing embodiment may be grounded through the second resistor R2, that is, one end of the second resistor R2 is connected to the second interface B, the other end is connected to the third interface C, the third interface C is grounded, the first switch tube Q1 may be connected in parallel to two ends of the second resistor R2, a control end of the first switch tube Q1 is connected to the fault logic control circuit 101, and is controlled by the fault logic control circuit 101 to be turned on or off, and is connected in parallel to the second resistor R2.
In some embodiments, the first switching transistor Q1 of the present application includes any one of a gate turn-off thyristor, a power transistor, a metal oxide semiconductor field effect transistor, and an insulated gate bipolar transistor. For example, in fig. 3, the first switch Q1 may be a MOS transistor, and has a gate connected to the fault logic control circuit 101, a drain connected to the second interface B, and a source connected to the third interface C. In this way, the fault logic control circuit 101 can feed back and output the output to the gate of the MOS transistor, thereby controlling the switching of the MOS transistor. When the voltage is not undervoltage, the MOS tube of the fault logic control circuit 101 can be switched off; when under-voltage occurs, the MOS tube of the fault logic control circuit 101 can be conducted to form a hysteresis effect.
In some embodiments, the second resistor R2 may be a variable resistor. In the embodiment of the present application, each variable resistor may be implemented by a rheostat, a varistor box, or the like, or may be implemented by a user replacing the resistance value of the resistor connected at the interface, which is not limited to this.
Referring to fig. 4, in an embodiment of the present application, another high voltage integrated circuit is provided, which mainly includes:
an undervoltage protection circuit and fault logic control circuit 101;
the undervoltage protection circuit comprises a comparator 102, a constant current power supply 103, a third resistor R3, a fourth resistor R4, a fourth interface D, a fifth interface E and a second variable resistor RX 2;
the output end of the comparator 102 is connected to the input end of the fault logic control circuit 101, and the output end of the fault logic control circuit 101 is used for being connected to an external processor; the output end of the constant current power supply 103 is connected to the first input port of the comparator 102, the output end of the constant current power supply 103 is further connected to the fourth interface D, the fifth interface E is grounded, the first end of the third resistor R3 is connected to the undervoltage monitoring point VCC, the second end of the third resistor R3 is connected to the second input port of the comparator 102, and the second end of the third resistor R3 is further grounded through the fourth resistor R4.
In the embodiment of the application, another high-voltage integrated circuit with a variable voltage threshold for triggering an under-voltage protection function is provided. In the high-voltage integrated circuit, the undervoltage protection circuit includes a comparator 102, and the comparator 102 is configured to output a corresponding level signal by comparing a set reference voltage with a voltage value detected at an undervoltage monitoring point VCC, so that the fault logic control circuit 101 triggers undervoltage protection or maintains a working state. The specific implementation principle is similar to that of the foregoing embodiment, and is not described herein again. In the embodiment of the present application, the second input port of the comparator 102, such as the positive input port, may be connected to the undervoltage monitoring point VCC through a third resistor R3, and further connected to the ground through a fourth resistor R4. Therefore, the third resistor R3 and the fourth resistor R4 are included between the undervoltage monitoring point VCC and the ground point to divide the voltage, so as to fix the voltage value input at the second input port of the comparator 102. For example, if the resistances of the third resistor R3 and the fourth resistor R4 are the same, the voltage input at the second input port of the comparator 102 is equal to half of the undervoltage monitoring point VCC, and if it is desired to set the start threshold of the undervoltage protection function of the undervoltage monitoring point VCC to 10V, the voltage input at the first input port of the comparator 102 may be fixed to 5V, so that when the voltage of the undervoltage monitoring point VCC is higher than 10V, the voltage input at the second input port of the comparator 102 is greater than 5V, and the undervoltage protection function is not started; when the voltage of the undervoltage monitoring point VCC is below 10V, the voltage input at the second input port of the comparator 102 is smaller than 5V, and the undervoltage protection function is started. Certainly, in practical application, the resistance values of the third resistor R3 and the fourth resistor R4 may be selected as needed, and when the resistance values of the third resistor R3 and the fourth resistor R4 are determined, the proportional relationship between the voltage of the undervoltage monitoring point VCC and the voltage input at the second input port of the voltage comparator 102 is also determined, and the adjustment of the undervoltage protection threshold can be realized by changing the voltage input at the first input port of the comparator 102. In this embodiment of the application, the voltage input at the first input port of the comparator 102 may be flexibly configured as required, specifically, the voltage is determined by a product of a current output of the constant current power supply 103 and a resistance of the second variable resistor RX2, when the undervoltage protection threshold needs to be changed, adjusting the resistance of the second variable resistor RX2 may be implemented, for example, when the undervoltage protection threshold needs to be increased, the resistance of the second variable resistor RX2 may be increased.
Referring to fig. 5, in some embodiments, the high voltage integrated circuit further includes a MOS transistor and a fifth resistor R5, a gate of the MOS transistor is connected to the fault logic control circuit 101, a second terminal of the fourth resistor R4 is connected to ground through the fifth resistor R5, and the MOS transistor and the fifth resistor R5 are connected in parallel.
In the embodiment of the application, a retention loop can be further arranged in the undervoltage protection circuit. The principle is similar to the embodiment of fig. 3 and will not be described herein. It is understood that the MOS transistor in fig. 5 may be replaced by a gate turn-off thyristor, a power transistor, or an insulated gate bipolar transistor.
In the embodiment of the present application, at least one of the third resistor R3, the fourth resistor R4, or the fifth resistor R5 may be a variable resistor. The second variable resistor RX2 and the variable resistors may be implemented by a rheostat, a varistor box, or the like, or may be implemented by changing the resistance of a resistor connected at the interface by the user, which is not limited.
Referring to fig. 6, in an embodiment of the present application, there is provided another high voltage integrated circuit, which mainly includes:
an undervoltage protection circuit and fault logic control circuit 101;
the undervoltage protection circuit comprises a comparator 102, a reference power supply V1, a sixth resistor R6, a seventh resistor R7, a decoder 104 and a second switching tube Q2;
the output end of the comparator 102 is connected to the input end of the fault logic control circuit 101, and the output end of the fault logic control circuit 101 is used for being connected to an external processor; a first input port of the comparator 102 is connected to the positive terminal of the reference power supply V1, and the negative terminal of the reference power supply V1 is grounded; the second input port of the comparator 102 is connected to the undervoltage monitoring point VCC through the sixth resistor R6, the second input port of the comparator 102 is further connected to the first end of the seventh resistor R7, and the second end of the seventh resistor R7 is grounded; the input end of the decoder 104 is used for being connected to an external processor, the output end of the decoder 104 is connected to the control end of the second switch tube Q2, and the second switch tube Q2 is connected in parallel with the seventh resistor R7.
In the embodiment of the application, another high-voltage integrated circuit with a variable voltage threshold for triggering an under-voltage protection function is also provided. In the high-voltage integrated circuit, the undervoltage protection circuit includes a comparator 102, and the comparator 102 is configured to output a corresponding level signal by comparing a set reference voltage with a voltage value detected at an undervoltage monitoring point VCC, so that the fault logic control circuit 101 triggers undervoltage protection or maintains a working state. The specific implementation principle is similar to that of the foregoing embodiment, and is not described herein again.
In the embodiment of the present application, the second input port of the comparator 102, for example, is a positive input port, and may be connected to the undervoltage monitoring point VCC through a sixth resistor R6, and further, is grounded through a seventh resistor R7, where the number of the seventh resistors R7 in the undervoltage protection circuit may be multiple, and after the seventh resistors R7 are connected in series, one end of each of the seventh resistors R7 is grounded, and the other end of each of the seventh resistors R3526 is connected to the second input port of the comparator 102. Therefore, a branch consisting of the sixth resistor R6 and the seventh resistors R7 is arranged between the undervoltage monitoring point VCC and the grounding point, and the number of the seventh resistors R7 connected to the branch can influence the proportional relation between the undervoltage monitoring point VCC and the voltage input at the second input port of the comparator 102. The larger the number of the seventh resistor R7 connected in the branch is, the closer the voltage input at the second input port of the comparator 102 is to the undervoltage monitoring point VCC. In the embodiment of the present application, a decoder 104 with multiple outputs and a corresponding second switching tube Q2 are further provided, and an input end of the decoder 104 is used for being connected to an external processor, and receiving a selection signal sent by the processor, so as to output a high level on a corresponding path. The output end of the decoder 104 is connected to the control end of the second switch tube Q2, and the second switch tube Q2 is connected in parallel with the seventh resistor R7, so that when the second switch tube Q2 is turned on, the seventh resistor R7 connected in parallel is short-circuited, and the voltage drop across the sixth resistor R6 is correspondingly increased, so that the proportion between the undervoltage monitoring point VCC and the voltage input at the second input port of the comparator 102 is reduced, which is equivalent to reducing the threshold of undervoltage protection; on the contrary, when the second switch tube Q2 is turned off, the seventh resistor R7 connected in parallel is connected to the branch between the undervoltage monitoring point VCC and the ground, and accordingly, the voltage drop across the sixth resistor R6 is correspondingly reduced, so that the ratio of the undervoltage monitoring point VCC to the voltage input at the second input port of the comparator 102 is increased, which is equivalent to improving the threshold of undervoltage protection. Therefore, in the embodiment of the present application, the number of the second switching tubes Q2 that are turned on can be selected by the processor, and the voltage threshold triggered by the under-voltage protection function can be flexibly adjusted, so that the under-voltage protection function is more flexible.
In some embodiments, the under-voltage protection circuit includes a plurality of sets of seventh resistors R7 and second switching tubes Q2, the seventh resistors R7 of each set are connected in series, and the second switching tubes Q2 and the seventh resistors R7 of each set are connected in parallel, where the resistance values of the seventh resistors R7 may be different or may be the same, which is not limited in this application. In the embodiment shown in fig. 6, 4 sets of the seventh resistor R7 and the second switch tube Q2 are provided, and in a practical embodiment, the number of the sets may be any number greater than or equal to 2.
Referring to fig. 7, in some embodiments, the high voltage integrated circuit further includes a MOS transistor and an eighth resistor R8, a gate of the MOS transistor is connected to the fault logic control circuit 101, the seventh resistor R7 is grounded through the eighth resistor R8, and the MOS transistor and the eighth resistor R8 are connected in parallel.
In the embodiment of the application, a retention loop can be further arranged in the undervoltage protection circuit. The principle is similar to the embodiment of fig. 3 and will not be described herein. It is understood that the MOS transistor in fig. 7 may be replaced by a gate turn-off thyristor, a power transistor, or an insulated gate bipolar transistor.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A high voltage integrated circuit, comprising:
the undervoltage protection circuit and the fault logic control circuit;
the undervoltage protection circuit comprises a comparator, a reference power supply, a first resistor, a first interface, a second interface and a first variable resistor;
the output end of the comparator is connected to the input end of the fault logic control circuit, and the output end of the fault logic control circuit is used for being connected to an external processor; the positive end of the reference power supply is connected with the first input port of the comparator, the negative end of the reference power supply is grounded, and the second input port of the comparator is connected to the undervoltage monitoring point through the first resistor; the second input port of the comparator is also connected to the first interface, and the second interface is grounded; the first end of the first variable resistor is connected with the first interface, and the second end of the first variable resistor is connected with the second interface.
2. The high voltage integrated circuit according to claim 1, further comprising a first switch tube, a second resistor, and a third interface, wherein a control terminal of the first switch tube is connected to the fault logic control circuit, the second interface is grounded through the first switch tube, the third interface is grounded, a first terminal of the second resistor is connected to the second interface, and a second terminal of the second resistor is connected to the third interface.
3. The HVIC of claim 2, wherein the second resistor is a variable resistor.
4. The high voltage integrated circuit of claim 2, wherein the first switch tube comprises any one of a gate turn-off thyristor, a power transistor, a metal oxide semiconductor field effect transistor, and an insulated gate bipolar transistor.
5. A high voltage integrated circuit, comprising:
the undervoltage protection circuit and the fault logic control circuit;
the undervoltage protection circuit comprises a comparator, a constant current power supply, a third resistor, a fourth interface, a fifth interface and a second variable resistor;
the output end of the comparator is connected to the input end of the fault logic control circuit, and the output end of the fault logic control circuit is used for being connected to an external processor; the output end of the constant current power supply is connected to the first input port of the comparator, the output end of the constant current power supply is further connected to the fourth interface, the fifth interface is grounded, the first end of the third resistor is connected to the undervoltage monitoring point, the second end of the third resistor is connected to the second input port of the comparator, and the second end of the third resistor is further grounded through the fourth resistor.
6. The high-voltage integrated circuit according to claim 5, further comprising a MOS transistor and a fifth resistor, wherein a gate of the MOS transistor is connected to the fault logic control circuit, a second end of the fourth resistor is connected to ground through the fifth resistor, and the MOS transistor and the fifth resistor are connected in parallel.
7. The HVIC of claim 6, wherein at least one of the third resistor, the fourth resistor, or the fifth resistor is a variable resistor.
8. A high voltage integrated circuit, comprising:
the undervoltage protection circuit and the fault logic control circuit;
the undervoltage protection circuit comprises a comparator, a reference power supply, a sixth resistor, a seventh resistor, a decoder and a second switching tube;
the output end of the comparator is connected to the input end of the fault logic control circuit, and the output end of the fault logic control circuit is used for being connected to an external processor; the first input port of the comparator is connected with the positive terminal of the reference power supply, and the negative terminal of the reference power supply is grounded; a second input port of the comparator is connected to an under-voltage monitoring point through the sixth resistor, the second input port of the comparator is also connected to a first end of the seventh resistor, and a second end of the seventh resistor is grounded; the input end of the decoder is used for being connected to an external processor, the output end of the decoder is connected with the control end of the second switch tube, and the second switch tube is connected with the seventh resistor in parallel.
9. The HVIC of claim 8, wherein the undervoltage protection circuit comprises a plurality of sets of the seventh resistor and the second switch tube, the seventh resistors of each set are connected in series, and the second switch tube and the seventh resistor of each set are connected in parallel.
10. The high voltage integrated circuit according to claim 8, further comprising a MOS transistor and an eighth resistor, wherein a gate of the MOS transistor is connected to the fault logic control circuit, the seventh resistor is grounded through the eighth resistor, and the MOS transistor and the eighth resistor are connected in parallel.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111431408.0A CN114142430A (en) | 2021-11-29 | 2021-11-29 | High voltage integrated circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111431408.0A CN114142430A (en) | 2021-11-29 | 2021-11-29 | High voltage integrated circuit |
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| CN114142430A true CN114142430A (en) | 2022-03-04 |
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