CN116915226A - High-voltage driving circuit with overvoltage protection and high-voltage integrated circuit using same - Google Patents

High-voltage driving circuit with overvoltage protection and high-voltage integrated circuit using same Download PDF

Info

Publication number
CN116915226A
CN116915226A CN202310965437.8A CN202310965437A CN116915226A CN 116915226 A CN116915226 A CN 116915226A CN 202310965437 A CN202310965437 A CN 202310965437A CN 116915226 A CN116915226 A CN 116915226A
Authority
CN
China
Prior art keywords
circuit
voltage
overvoltage protection
power supply
comparison module
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310965437.8A
Other languages
Chinese (zh)
Inventor
冯宇翔
蒋华杏
华庆
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangdong Huixin Semiconductor Co Ltd
Original Assignee
Guangdong Huixin Semiconductor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guangdong Huixin Semiconductor Co Ltd filed Critical Guangdong Huixin Semiconductor Co Ltd
Priority to CN202310965437.8A priority Critical patent/CN116915226A/en
Publication of CN116915226A publication Critical patent/CN116915226A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
    • H03K17/081—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
    • H03K17/687—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Landscapes

  • Dc-Dc Converters (AREA)

Abstract

The invention relates to the technical field of integrated circuits, in particular to a high-voltage driving circuit with overvoltage protection and a high-voltage integrated circuit applying the same, wherein the high-voltage driving circuit with the overvoltage protection comprises a boost control circuit, an overvoltage protection unit and a driving circuit; the boost control circuit is used for externally connecting a power supply VCC to generate a power supply voltage; the overvoltage protection unit is used for receiving the power supply voltage and generating built-in voltage; when the variation of the power supply voltage is larger than the built-in voltage, the overvoltage protection unit does not output the power supply voltage; when the variation of the power supply voltage is smaller than the built-in voltage, the power supply voltage is output. The high-voltage integrated circuit comprises the high-voltage driving circuit and the low-voltage driving circuit with overvoltage protection. Therefore, the high-voltage driving circuit with overvoltage protection and the high-voltage integrated circuit can carry out circuit protection on overvoltage faults caused by negative pressure at the VS end.

Description

High-voltage driving circuit with overvoltage protection and high-voltage integrated circuit using same
Technical Field
The invention relates to the technical field of integrated circuits, in particular to a high-voltage driving circuit with overvoltage protection and a high-voltage integrated circuit using the same.
Background
A high voltage integrated circuit, HVIC, is an integrated circuit product that converts MCU signals into drive IGBT signals. The HVIC integrates the PMOS tube, the NMOS tube, the triode, the diode, the voltage stabilizing tube, the resistor and the capacitor to form circuits such as a Schmidt circuit, a low-voltage level conversion circuit, a high-voltage level conversion 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 and the like. On one hand, the HVIC receives the control signal of the MCU to drive the subsequent IGBT or MOS to work, and on the other hand, the HVIC sends the state detection signal of the system back to the MCU, which is a key chip in the IPM.
When the conventional HVIC is applied, the high-voltage side driving circuit is not provided with an overvoltage protection circuit, and the high-voltage side driving circuit directly outputs driving voltage to drive the high-power switch device.
However, in the process of driving the high-power switching device by the high-voltage side driving circuit, the high-power switching device is often impacted by a subsequent inverter circuit, so that the VS port of the high-voltage side driving circuit is in a negative voltage state, high voltage is generated between the VB port and the VS port, the high-voltage side driving circuit is in an abnormal power supply state, and the high-voltage side driving circuit is in overvoltage breakdown and burnout when serious.
Disclosure of Invention
Aiming at the defects, the invention aims to provide a high-voltage driving circuit with overvoltage protection and a high-voltage integrated circuit using the same, which can carry out circuit protection on overvoltage faults caused by negative pressure at a VS end.
To achieve the purpose, the invention adopts the following technical scheme:
a high-voltage driving circuit with overvoltage protection comprises a boost control circuit, an overvoltage protection unit and a driving circuit; the input end of the boost control circuit is used as a VCC port, the first output end of the driving circuit is used as a VB port, the second output end of the driving circuit is used as a HO port, and the third output end of the driving circuit is used as a VS port;
the first output end of the boost control circuit is electrically connected with the first input end of the overvoltage protection unit, the second input end of the overvoltage protection unit is electrically connected with the third output end of the driving circuit, and the output end of the overvoltage protection unit is electrically connected with the power supply end of the driving circuit;
the boost control circuit is used for externally connecting a power supply VCC to generate a power supply voltage;
the overvoltage protection unit is used for receiving the power supply voltage and generating built-in voltage; when the variation of the power supply voltage is larger than the built-in voltage, the overvoltage protection unit does not output the power supply voltage; and when the variation of the power supply voltage is smaller than the built-in voltage, the overvoltage protection unit outputs the power supply voltage.
Further, the overvoltage protection unit comprises a judging circuit and a switching circuit; the VB_IN end of the judging circuit is used as a first input end of the overvoltage protection unit, the VS input end of the judging circuit is used as a second input end of the overvoltage protection unit, and the VB_OUT end of the switching circuit is used as an output end of the overvoltage protection unit;
the output end of the judging circuit is electrically connected with the input end of the switching circuit, the VS output end of the judging circuit is electrically connected with the VS end of the switching circuit, and the control end of the judging circuit is electrically connected with the switching end of the switching circuit;
the judging circuit is used for receiving the power supply voltage and generating built-in voltage and switching level; when the variation of the power supply voltage is larger than the built-in voltage, the switch level is a low level; when the variation of the power supply voltage is smaller than the built-in voltage, the switch level is a high level;
the switching circuit is used for receiving the power supply voltage and the switching level and judging the switching level; when the switching level is a low level, the switching circuit does not output the power supply voltage; when the switching level is a high level, the switching circuit outputs the supply voltage.
Further, the judging circuit comprises a first comparing module, a second comparing module and a third comparing module; the output end of the third comparison module is used as the control end of the judging circuit, the forward input end of the first comparison module is used as the VB_IN end of the judging circuit, the reverse input end of the first comparison module is used as the VS input end of the judging circuit, and the forward input end of the second comparison module is used as the output end of the judging circuit; the reverse input end of the second comparison module is used as a VS output end of the judging circuit;
the first input end of the third comparison module is electrically connected with the output end of the first comparison module, the second input end of the third comparison module is electrically connected with the output end of the second comparison module, the forward input end of the first comparison module is electrically connected with the forward input end of the second comparison module, and the reverse input end of the first comparison module is electrically connected with the reverse input end of the second comparison module;
the first comparison module is used for receiving the power supply voltage and generating built-in voltage;
the second comparison module is used for receiving the power supply voltage and generating a reference voltage;
the third comparison module is used for receiving the reference voltage and the built-in voltage and generating a switching level; when the built-in voltage is smaller than the reference voltage, the switch level is a low level; when the built-in voltage is greater than the reference voltage, the switching level is a high level.
Further, the switch circuit comprises a resistor R4, a MOS tube Q2 and a MOS tube Q3; one end of the resistor R4 is used as an input end of the switching circuit, a grid electrode of the MOS tube Q2 is used as a switching end of the switching circuit, a drain electrode of the MOS tube Q2 is used as a VS end of the switching circuit, and a drain electrode of the MOS tube Q3 is used as a VB_OUT end of the switching circuit;
one end of the resistor R4 is electrically connected with the source electrode of the MOS tube Q3, and the other end of the resistor R4 and the grid electrode of the MOS tube Q3 are electrically connected with the source electrode of the MOS tube Q2;
when both the MOS transistor Q2 and the MOS transistor Q3 are cut off, the power supply voltage is not output; and when the MOS transistor Q2 and the MOS transistor Q3 are both conducted, outputting the power supply voltage.
Further, the first comparison module comprises a resistor R1 and a zener diode D1; one end of the resistor R1 is used as a positive input end of the first comparison module, the other end of the resistor R1 is used as an output end of the first comparison module, and an anode of the zener diode D1 is used as a negative input end of the first comparison module;
the other end of the resistor R1 is electrically connected with the cathode of the zener diode D1.
Further, the second comparison module comprises a resistor R2 and a resistor R3; one end of the resistor R2 is used as a positive input end of the second comparison module, the other end of the resistor R2 is used as an output end of the second comparison module, and one end of the resistor R3 is used as a negative input end of the second comparison module;
the other end of the resistor R1 is electrically connected with the other end of the resistor R3.
Further, the third comparing module includes a comparator Q1, a first input terminal of the comparator Q1 is used as a first input terminal of the third comparing module, a second input terminal of the comparator Q1 is used as a second input terminal of the third comparing module, and an output terminal of the comparator Q1 is used as an output terminal of the third comparing module.
Further, the reference voltage is greater than the regulated value of the zener diode D1.
Further, the circuit also comprises a driving signal input circuit and an RS latch; the input end of the driving signal input circuit is used as an HIN port; the output end of the driving signal input circuit is electrically connected with the input end of the RS latch, the output end of the RS latch is electrically connected with the input end of the driving circuit, and the power supply end of the driving signal input circuit is electrically connected with the second output end of the boost control circuit.
A high voltage integrated circuit comprising a low voltage drive circuit and a high voltage drive circuit with overvoltage protection as claimed in any one of the preceding claims.
The technical scheme provided by the invention can comprise the following beneficial effects: and an overvoltage protection unit is added at the front end of the VVC power supply voltage, which is subjected to boosting treatment by the boosting control circuit, for supplying power to the driving circuit to control the power supply of the driving circuit, so that the work of the high-voltage driving circuit can be started or closed. When the VS port has negative pressure, the power supply voltage is increased suddenly, the high-voltage driving circuit is overvoltage, at the moment, the overvoltage protection unit compares the variation of the power supply voltage with the built-in voltage, so that the overvoltage fault of the high-voltage driving circuit can be found, the overvoltage protection unit is immediately enabled to cut off the power supply voltage and supply the power supply voltage to the driving circuit, the high-voltage driving circuit is stopped to work, overvoltage protection is realized, and circuit burnout is avoided.
Drawings
FIG. 1 is a circuit diagram of a high voltage drive circuit with overvoltage protection according to one embodiment of the present invention;
fig. 2 is a circuit diagram of the overvoltage protection unit shown in fig. 1.
Wherein: the device comprises a boost control circuit 1, an overvoltage protection unit 2, a driving circuit 3, a judging circuit 21, a switching circuit 22, a first comparison module 211, a second comparison module 212, a third comparison module 213, a resistor R4, a MOS tube Q2, a MOS tube Q3, a resistor R1, a voltage stabilizing diode D1, a resistor R2, a resistor R3, a comparator Q1, a driving signal input circuit 4 and an RS latch 5.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the description of embodiments of the present invention, the terms "first," "second," and the like 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 defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless explicitly defined otherwise.
In describing embodiments of the present invention, it should be noted that the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be either fixedly coupled, detachably coupled, or integrally coupled, for example, unless otherwise indicated and clearly defined; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the embodiments of the present invention can be understood by those of ordinary skill in the art according to specific circumstances.
A high voltage driving circuit with overvoltage protection and a high voltage integrated circuit using the same according to an embodiment of the present invention are described below with reference to fig. 1 to 2.
The high-voltage driving circuit with the overvoltage protection comprises a boost control circuit 1, an overvoltage protection unit 2 and a driving circuit 3; the input end of the boost control circuit 1 is used as a VCC port, the first output end of the driving circuit 3 is used as a VB port, the second output end of the driving circuit 3 is used as a HO port, and the third output end of the driving circuit 3 is used as a VS port;
the first output end of the boost control circuit 1 is electrically connected with the first input end of the overvoltage protection unit 2, the second input end of the overvoltage protection unit 2 is electrically connected with the third output end of the driving circuit 3, and the output end of the overvoltage protection unit 2 is electrically connected with the power supply end of the driving circuit 3;
the boost control circuit 1 is used for externally connecting a power supply VCC to generate a power supply voltage;
the overvoltage protection unit 2 is used for receiving the power supply voltage and generating built-in voltage; when the variation of the supply voltage is larger than the built-in voltage, the overvoltage protection unit 2 does not output the supply voltage; when the amount of change in the supply voltage is smaller than the built-in voltage, the overvoltage protection unit 2 outputs the supply voltage.
In the preferred embodiment of the high-voltage driving circuit with overvoltage protection provided by the invention, according to the structure of the high-voltage driving circuit, the driving circuit 3 can drive the high-power device to work by providing a power supply, so that the overvoltage protection unit 2 is added to the front end of the power supply of the driving circuit 3 after the VVC power supply voltage is subjected to the boosting treatment by the boosting control circuit 1 so as to control the power supply of the driving circuit 3, and the work of the high-voltage driving circuit can be started or stopped. After the overvoltage protection unit 2 is added, the power supply voltage provided by the boost control circuit 1 to the driving circuit 3 passes through the overvoltage protection unit 2, the overvoltage protection unit 2 is electrically connected with the third output end of the driving circuit 3 through the second input end, namely, is connected with the VS port, and the power supply voltage can be regarded as the voltage between the VB port and the VS port at the moment; when the VS port has negative pressure, the power supply voltage is increased suddenly, the high-voltage driving circuit is overvoltage, at the moment, the overvoltage protection unit 2 is compared with the built-in voltage through the variation of the power supply voltage, the overvoltage fault of the high-voltage driving circuit can be found, the overvoltage protection unit 2 is enabled to cut off the power supply voltage to the driving circuit 2 immediately, so that the high-voltage driving circuit stops working, overvoltage protection is realized, and circuit burnout is avoided.
Further, the overvoltage protection unit 2 includes a judgment circuit 21 and a switching circuit 22; the vb_in terminal of the judgment circuit 21 is used as the first input terminal of the overvoltage protection unit 2, the VS input terminal of the judgment circuit 21 is used as the second input terminal of the overvoltage protection unit 2, and the vb_out terminal of the switch circuit 22 is used as the output terminal of the overvoltage protection unit 2;
the output end of the judging circuit 21 is electrically connected with the input end of the switching circuit 22, the VS output end of the judging circuit 21 is electrically connected with the VS end of the switching circuit 22, and the control end of the judging circuit 21 is electrically connected with the switching end of the switching circuit 22;
the judging circuit 21 is used for receiving the power supply voltage and generating a built-in voltage and a switching level; when the variation of the power supply voltage is larger than the built-in voltage, the switch level is a low level; when the variation of the power supply voltage is smaller than the built-in voltage, the switch level is a high level;
the switching circuit 22 is used for receiving the supply voltage and the switching level and judging the switching level; when the switching level is a low level, the switching circuit 22 does not output the supply voltage; when the switching level is high, the switching circuit 22 outputs the supply voltage.
In this embodiment, in order to control the power supply line of the driving circuit 3, the overvoltage protection unit 2 divides the power supply line into a judging circuit 21 and a switch circuit 22, the switch circuit 22 controls the on-off of the power supply line, and the judging circuit 21 monitors the power supply voltage in real time; the judging circuit 21 monitors the power supply voltage in real time, compares the variation of the power supply voltage with the built-in voltage, and transmits the comparison result to the switching circuit 22 in a switching level mode, and the switching circuit 22 determines whether the power supply line is conducted or not according to the switching level so that the power supply voltage can be supplied to the driving circuit 3; therefore, the real-time overvoltage protection of the high-voltage driving circuit is realized, the power can be immediately cut off when the negative pressure condition of the VS end occurs, the high-voltage driving circuit is cut off to stop working, and the response is rapid and reliable.
Further, the judging circuit 21 includes a first comparing module 211, a second comparing module 212, and a third comparing module 213; the output terminal of the third comparing module 213 is used as the control terminal of the judging circuit 21, the forward input terminal of the first comparing module 211 is used as the vb_in terminal of the judging circuit 21, the reverse input terminal of the first comparing module 211 is used as the VS input terminal of the judging circuit 21, and the forward input terminal of the second comparing module 212 is used as the output terminal of the judging circuit 21; the inverting input of the second comparison module 212 serves as the VS output of the determination circuit 21;
the first input end of the third comparison module 213 is electrically connected to the output end of the first comparison module 211, the second input end of the third comparison module 213 is electrically connected to the output end of the second comparison module 212, the forward input end of the first comparison module 211 is electrically connected to the forward input end of the second comparison module 212, and the reverse input end of the first comparison module 211 is electrically connected to the reverse input end of the second comparison module 212;
the first comparison module 211 is configured to receive a supply voltage and generate a built-in voltage;
the second comparison module 212 is configured to receive the supply voltage and generate a reference voltage;
the third comparing module 213 is configured to receive the reference voltage and the built-in voltage, and generate a switching level; when the built-in voltage is smaller than the reference voltage, the switch level is low; when the built-in voltage is greater than the reference voltage, the switching level is high.
In this embodiment, the judging circuit 21 is configured with a comparison logic judging mechanism by a first comparing module 211, a second comparing module 212 and a third comparing module 213 for realizing the function of monitoring the power supply voltage in real time. The reference voltage generated by the second comparison module 212 receiving the supply voltage may generally refer to a reference value of whether the supply voltage is suddenly changed at this time; the first comparison module 211 receives the built-in voltage generated by the power supply voltage and may generally refer to a sudden change condition of the power supply voltage at this time; according to the principle that when the VS end generates negative pressure, the power supply voltage is suddenly changed, so that the first comparison module 211 does not need to detect a specific variable quantity when detecting the sudden change condition of the power supply voltage, and the built-in voltage is set to be small to represent that the sudden change of the power supply voltage occurs at the moment, namely the VS end generates negative pressure, so that an overvoltage fault is formed; setting the built-in voltage to be large represents that the power supply voltage is normal at the moment, namely no fault exists; in this way, the third comparing module 213 can know whether the built-in voltage is set to be large or small at this time by comparing the built-in voltage with the reference voltage, so as to know whether the high voltage driving circuit has a fault at this time, and the corresponding output switch level controls the switch circuit 22 to complete the monitoring function.
Further, the switch circuit 22 includes a resistor R4, a MOS transistor Q2, and a MOS transistor Q3; one end of the resistor R4 is used as an input end of the switch circuit 22, a grid electrode of the MOS tube Q2 is used as a switch end of the switch circuit 22, a drain electrode of the MOS tube Q2 is used as a VS end of the switch circuit 22, and a drain electrode of the MOS tube Q3 is used as a VB_OUT end of the switch circuit 22;
one end of the resistor R4 is electrically connected with the source electrode of the MOS tube Q3, and the other end of the resistor R4 and the grid electrode of the MOS tube Q3 are electrically connected with the source electrode of the MOS tube Q2;
when the MOS transistor Q2 and the MOS transistor Q3 are both cut off, no power supply voltage is output; when the MOS transistor Q2 and the MOS transistor Q3 are both conducted, the power supply voltage is output.
In this embodiment, the switching circuit 22 realizes the control function of the power supply line, the MOS transistor Q2 is used to receive the switching level control signal from the judging circuit 21, the MOS transistor Q3 is used to control the power supply line, then the MOS transistor Q2 correspondingly performs the on or off operation according to the switching level condition, and the MOS transistor Q3 monitors the operation condition of the MOS transistor Q2 to correspondingly perform the on or off operation, so as to achieve the control function of the power supply line.
Further, the first comparing module 211 includes a resistor R1 and a zener diode D1; one end of the resistor R1 is used as a forward input end of the first comparison module 211, the other end of the resistor R1 is used as an output end of the first comparison module 211, and an anode of the zener diode D1 is used as an reverse input end of the first comparison module 211;
the other end of the resistor R1 is electrically connected to the cathode of the zener diode D1.
In this embodiment, the first comparing module 211 is implemented by forming a voltage stabilizing circuit by the resistor R1 and the zener diode D1 in order to implement the corresponding implementation of the setting or the setting according to whether the power supply voltage is suddenly changed, according to the principle, when no negative pressure occurs at the VS end, no fault is represented at this time, the zener diode D1 is not turned on, and is in a cut-off state, and the output built-in voltage is the voltage at both ends of the resistor R1, so that the built-in voltage is a set value; when the negative pressure appears at the VS end, the overvoltage fault is represented at the moment, the voltage stabilizing diode D1 is conducted, the built-in voltage output at the moment is the conducting voltage of the voltage stabilizing diode D1 (the voltage stabilizing value of the voltage stabilizing diode D1), and the built-in voltage is far smaller than the power supply voltage at the moment, so that the built-in voltage is a small value; so that the power supply voltage rapid change condition can be obviously reflected. More importantly, the voltage stabilizing value of the voltage stabilizing diode D1 is generally smaller, when the negative pressure condition occurs at the VS end, the voltage stabilizing diode D1 can be immediately conducted when the negative pressure is smaller, the built-in voltage with small output is output, and the sensitivity of overvoltage protection is improved.
It should be noted that, the process of setting and setting the first comparison module 211 is a process of comparing the variation of the supply voltage with the built-in voltage, and only if the variation of the supply voltage (i.e., the negative voltage) exceeds the regulated value of the zener diode D1, the setting and setting process is performed to make the subsequent circuit implement overvoltage protection.
Further, the second comparison module 212 includes a resistor R2 and a resistor R3; one end of the resistor R2 is used as a positive input end of the second comparison module 212, the other end of the resistor R2 is used as an output end of the second comparison module 212, and one end of the resistor R3 is used as a negative input end of the second comparison module 212;
the other end of the resistor R1 is electrically connected to the other end of the resistor R3.
In this embodiment, the second comparing module 212 uses the resistor R2 and the resistor R3 to form the voltage dividing circuit to provide the reference voltage for distinguishing whether the built-in voltage is large or small, and the voltage across the resistor R3 is input to the third comparing module 213. Because the voltage dividing circuit divides the power supply voltage, the voltage value after the voltage division is certainly small relative to the power supply voltage, so that whether the built-in voltage is large or not can be distinguished; since the voltage stabilizing value of the zener diode D1 is generally smaller and much smaller than the power supply voltage, it is known that the divided voltage is definitely larger than the voltage stabilizing value of the zener diode D1, so that it is possible to distinguish whether the built-in voltage is small.
Further, the third comparing module 213 includes a comparator Q1, a first input terminal of the comparator Q1 is used as a first input terminal of the third comparing module 213, a second input terminal of the comparator Q1 is used as a second input terminal of the third comparing module 213, and an output terminal of the comparator Q1 is used as an output terminal of the third comparing module 213.
In this embodiment, in order to realize the comparison function of the third comparison module 213, the comparator Q1 is preferably used as a component for determining the magnitudes of the built-in voltage and the reference voltage, so that the circuit of the third comparison module 213 is simple, the comparison steps are fewer, and the comparator Q1 has the characteristics of good stability and fast sensitivity, so that the comparison function can be simply, quickly and stably completed.
Further, the reference voltage is greater than the regulated value of the zener diode D1.
In this embodiment, in order to further ensure the accuracy of judging whether the power supply voltage is suddenly changed, the reference voltage should be ensured to be constantly greater than the regulated value of the zener diode D1. Because the reference voltage is formed by voltage division of the voltage division circuit, although the voltage stabilizing value of the voltage stabilizing diode D1 is generally smaller, the situation that the resistance value of the voltage division circuit is not selected correctly can exist, so that the voltage after negative pressure is smaller than the voltage stabilizing value of the voltage stabilizing diode D1, and therefore the reference voltage is ensured to be constantly larger than the voltage stabilizing value of the voltage stabilizing diode D1, and the overvoltage detection can be ensured to be correct.
Further, the circuit also comprises a driving signal input circuit 4 and an RS latch 5; the input terminal of the drive signal input circuit 4 serves as an HIN port; the output end of the driving signal input circuit 4 is electrically connected with the input end of the RS latch 5, the output end of the RS latch 5 is electrically connected with the input end of the driving circuit 3, and the power supply end of the driving signal input circuit 4 is electrically connected with the second output end of the boost control circuit 1.
In this embodiment, the high voltage driving circuit further includes a processing loop for driving signals, which is composed of a driving signal input circuit 4 and an RS latch 5, where the driving signal input circuit 4 starts to work when the boost control circuit 1 is powered, the external bridge driving signal is transmitted to the RS latch 5 to store and trigger, and finally the driving circuit 3 outputs a driving signal about 15V relative to the VS end to drive the subsequent high power device. It should be noted that, the reason why the overvoltage protection unit 2 is not disposed in the driving signal processing circuit is that, although the driving circuit can be turned off during overvoltage, the power circuit cannot be turned off, and the power circuit still burns out due to the overvoltage, so that the overvoltage protection unit 2 is disposed in the power circuit to protect the high voltage driving circuit most comprehensively, and all the circuits can be turned off to obtain the overvoltage protection.
A high voltage integrated circuit comprises a low voltage driving circuit and the high voltage driving circuit with overvoltage protection.
In the preferred embodiment of the high-voltage integrated circuit provided by the invention, the high-voltage integrated circuit is formed by the high-voltage driving circuit and the low-voltage driving circuit with overvoltage protection, and the high-voltage integrated circuit drives the upper bridge arm and the lower bridge arm of the high-power device respectively through the high-voltage driving circuit and the low-voltage driving circuit with overvoltage protection, so that when the negative pressure occurs at the VS end and overvoltage occurs, overvoltage protection measures are implemented by the high-voltage driving circuit, if the power circuit only uses the high-voltage driving circuit, the power supply of the high-voltage driving circuit can be cut off to implement overvoltage protection, and if the power circuit is used for the whole high-voltage integrated circuit, the power supply of the whole high-voltage integrated circuit can be cut off to realize the overvoltage protection of the whole high-voltage integrated circuit, and the overvoltage protection mechanism has strong expansibility.
Other configurations, etc. and operations of a high voltage driving circuit with overvoltage protection and a high voltage integrated circuit using the same according to an embodiment of the present invention are known to those skilled in the art, and will not be described in detail herein.
In the description herein, reference to the term "embodiment," "example," etc., means 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, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. The utility model provides a take overvoltage protection's high voltage drive circuit which characterized in that: the device comprises a boost control circuit, an overvoltage protection unit and a driving circuit; the input end of the boost control circuit is used as a VCC port, the first output end of the driving circuit is used as a VB port, the second output end of the driving circuit is used as a HO port, and the third output end of the driving circuit is used as a VS port;
the first output end of the boost control circuit is electrically connected with the first input end of the overvoltage protection unit, the second input end of the overvoltage protection unit is electrically connected with the third output end of the driving circuit, and the output end of the overvoltage protection unit is electrically connected with the power supply end of the driving circuit;
the boost control circuit is used for externally connecting a power supply VCC to generate a power supply voltage;
the overvoltage protection unit is used for receiving the power supply voltage and generating built-in voltage; when the variation of the power supply voltage is larger than the built-in voltage, the overvoltage protection unit does not output the power supply voltage; and when the variation of the power supply voltage is smaller than the built-in voltage, the overvoltage protection unit outputs the power supply voltage.
2. The high voltage driving circuit with overvoltage protection according to claim 1, wherein: the overvoltage protection unit comprises a judging circuit and a switching circuit; the VB_IN end of the judging circuit is used as a first input end of the overvoltage protection unit, the VS input end of the judging circuit is used as a second input end of the overvoltage protection unit, and the VB_OUT end of the switching circuit is used as an output end of the overvoltage protection unit;
the output end of the judging circuit is electrically connected with the input end of the switching circuit, the VS output end of the judging circuit is electrically connected with the VS end of the switching circuit, and the control end of the judging circuit is electrically connected with the switching end of the switching circuit;
the judging circuit is used for receiving the power supply voltage and generating built-in voltage and switching level; when the variation of the power supply voltage is larger than the built-in voltage, the switch level is a low level; when the variation of the power supply voltage is smaller than the built-in voltage, the switch level is a high level;
the switching circuit is used for receiving the power supply voltage and the switching level and judging the switching level; when the switching level is a low level, the switching circuit does not output the power supply voltage; when the switching level is a high level, the switching circuit outputs the supply voltage.
3. The high voltage driving circuit with overvoltage protection according to claim 2, wherein: the judging circuit comprises a first comparing module, a second comparing module and a third comparing module; the output end of the third comparison module is used as the control end of the judging circuit, the forward input end of the first comparison module is used as the VB_IN end of the judging circuit, the reverse input end of the first comparison module is used as the VS input end of the judging circuit, and the forward input end of the second comparison module is used as the output end of the judging circuit; the reverse input end of the second comparison module is used as a VS output end of the judging circuit;
the first input end of the third comparison module is electrically connected with the output end of the first comparison module, the second input end of the third comparison module is electrically connected with the output end of the second comparison module, the forward input end of the first comparison module is electrically connected with the forward input end of the second comparison module, and the reverse input end of the first comparison module is electrically connected with the reverse input end of the second comparison module;
the first comparison module is used for receiving the power supply voltage and generating built-in voltage;
the second comparison module is used for receiving the power supply voltage and generating a reference voltage;
the third comparison module is used for receiving the reference voltage and the built-in voltage and generating a switching level; when the built-in voltage is smaller than the reference voltage, the switch level is a low level; when the built-in voltage is greater than the reference voltage, the switching level is a high level.
4. The high voltage driving circuit with overvoltage protection according to claim 2, wherein: the switching circuit comprises a resistor R4, a MOS tube Q2 and a MOS tube Q3; one end of the resistor R4 is used as an input end of the switching circuit, a grid electrode of the MOS tube Q2 is used as a switching end of the switching circuit, a drain electrode of the MOS tube Q2 is used as a VS end of the switching circuit, and a drain electrode of the MOS tube Q3 is used as a VB_OUT end of the switching circuit;
one end of the resistor R4 is electrically connected with the source electrode of the MOS tube Q3, and the other end of the resistor R4 and the grid electrode of the MOS tube Q3 are electrically connected with the source electrode of the MOS tube Q2;
when both the MOS transistor Q2 and the MOS transistor Q3 are cut off, the power supply voltage is not output; and when the MOS transistor Q2 and the MOS transistor Q3 are both conducted, outputting the power supply voltage.
5. A high voltage driving circuit with overvoltage protection according to claim 3, wherein: the first comparison module comprises a resistor R1 and a zener diode D1; one end of the resistor R1 is used as a positive input end of the first comparison module, the other end of the resistor R1 is used as an output end of the first comparison module, and an anode of the zener diode D1 is used as a negative input end of the first comparison module;
the other end of the resistor R1 is electrically connected with the cathode of the zener diode D1.
6. A high voltage driving circuit with overvoltage protection according to claim 3, wherein: the second comparison module comprises a resistor R2 and a resistor R3; one end of the resistor R2 is used as a positive input end of the second comparison module, the other end of the resistor R2 is used as an output end of the second comparison module, and one end of the resistor R3 is used as a negative input end of the second comparison module;
the other end of the resistor R1 is electrically connected with the other end of the resistor R3.
7. A high voltage driving circuit with overvoltage protection according to claim 3, wherein: the third comparing module comprises a comparator Q1, a first input terminal of the comparator Q1 is used as a first input terminal of the third comparing module, a second input terminal of the comparator Q1 is used as a second input terminal of the third comparing module, and an output terminal of the comparator Q1 is used as an output terminal of the third comparing module.
8. The high voltage driving circuit with overvoltage protection according to claim 5, wherein: the reference voltage is greater than the regulated value of the zener diode D1.
9. The high voltage driving circuit with overvoltage protection according to claim 1, wherein: the circuit also comprises a driving signal input circuit and an RS latch; the input end of the driving signal input circuit is used as an HIN port; the output end of the driving signal input circuit is electrically connected with the input end of the RS latch, the output end of the RS latch is electrically connected with the input end of the driving circuit, and the power supply end of the driving signal input circuit is electrically connected with the second output end of the boost control circuit.
10. A high voltage integrated circuit, characterized by: comprising a low voltage drive circuit and a high voltage drive circuit with overvoltage protection according to any one of claims 1 to 9.
CN202310965437.8A 2023-08-02 2023-08-02 High-voltage driving circuit with overvoltage protection and high-voltage integrated circuit using same Pending CN116915226A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310965437.8A CN116915226A (en) 2023-08-02 2023-08-02 High-voltage driving circuit with overvoltage protection and high-voltage integrated circuit using same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310965437.8A CN116915226A (en) 2023-08-02 2023-08-02 High-voltage driving circuit with overvoltage protection and high-voltage integrated circuit using same

Publications (1)

Publication Number Publication Date
CN116915226A true CN116915226A (en) 2023-10-20

Family

ID=88353056

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310965437.8A Pending CN116915226A (en) 2023-08-02 2023-08-02 High-voltage driving circuit with overvoltage protection and high-voltage integrated circuit using same

Country Status (1)

Country Link
CN (1) CN116915226A (en)

Similar Documents

Publication Publication Date Title
CN102263544B (en) IGBT driving circuit with electrification protection
CN100487995C (en) Short-circuit protective circuit
CN101720147B (en) LED driving circuit and LED device
CN210156904U (en) Short-circuit protection circuit for vehicle power supply
US4317056A (en) Voltage monitoring and indicating circuit
CN116915226A (en) High-voltage driving circuit with overvoltage protection and high-voltage integrated circuit using same
CN209375119U (en) A kind of protection hiccup circuit
CN217769454U (en) Short-circuit protection circuit and driving power supply
CN214337789U (en) Direct-current low-side driving switch circuit with short circuit and overload protection functions
CN113820619A (en) Short circuit detection circuit, electronic device and short circuit detection method
CN112737287A (en) Direct-current low-side driving switch circuit with short circuit and overload protection functions
CN208571920U (en) A kind of compensation circuit
CN207801885U (en) The driving detection device and electric discharge device of electric discharge metal-oxide-semiconductor
CN215990737U (en) Active self-checking drive protection circuit
CN213547475U (en) Integrated circuit based on MOS pipe current detection
CN112003363B (en) Embedded power supply system management circuit
CN210806716U (en) Over-current protection circuit for driving power supply of motor controller of electric automobile
CN108495240A (en) A kind of system eliminated audio system and close generation POP sound
CN215986425U (en) Short circuit detection circuit and electronic device
CN219287363U (en) Overcurrent protection circuit for inverter and inverter
CN217956951U (en) IGBT driving power supply protection circuit with negative bias voltage
CN115236496B (en) Interlocking connection detection circuit
CN216959295U (en) Quick shutdown discharge circuit and power supply system
CN212433612U (en) Driving device and vehicle system
CN215733443U (en) Overvoltage and overcurrent protection circuit

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination