Power drive circuit and drive system

Abstract

The present invention provides a power driver circuit, which includes: a high / low side driver module that is turned on or off according to a coordinated control signal, and is used to generate a high side driver signal according to a high side input signal and generate a low side driver signal according to a low side input signal when the power driver circuit is turned on; a coordinated processing module that is used to compare an input voltage with a threshold voltage to generate a coordinated control signal, and the threshold voltage is switched between a first voltage and a second voltage according to the coordinated control signal; and a temperature detection module that is connected to an output terminal of the coordinated processing module, and is used to detect a change in temperature, generate a detection signal that changes with temperature, generate a detection increment, and control whether to superimpose the detection increment on the detection signal and output it according to the coordinated control signal. The input voltage is related to the detection signal.

Description

[Technical field]

[0001] This application claims priority to a Chinese patent application filed with the State Intellectual Property Office of the People's Republic of China on March 28, 2022, bearing application number 202210314262.X and entitled "Power Drive Circuit and Drive System," the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to the field of integrated circuit design, and in particular to power drive circuits and drive systems. [Background technology]

[0003] An intelligent power module (IPM) is a package that integrates multiple half-bridge drive circuits, power switching devices, peripheral detection circuits, etc. to form a circuit with protection functions against overvoltage, overcurrent, overheating, etc., and has characteristics such as low power consumption, interference resistance, and flexible turn-off.

[0004] Due to the advantages of being highly reliable, easy to use, and allowing the size of the printed circuit board (PCB) to be significantly reduced, the IPM is particularly suitable for frequency converters of drive motors and various inverter power supplies, and is an ideal power electronics device for speed adjustment by frequency conversion, electric traction, servo drives, and variable frequency home appliances.

[0005] In a drive system consisting of one IPM, temperature detection is achieved by directly comparing the detection voltage with the threshold voltage. However, in a drive system consisting of multiple IPMs, there is a problem of consistency. Specifically, in most cases, multiple IPMs use the same detection voltage for temperature detection, but differences in threshold voltages and comparator offset voltages between multiple IPMs can cause comparator operations to not match, resulting in system control abnormalities. Summary of the Invention [Problem to be solved by the invention]

[0006] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a power driving circuit and a driving system to solve the problem of inconsistent operation between IPMs in conventional driving systems. [Means for solving the problem]

[0007] In order to achieve the above and other related objects, the present invention provides a power driver circuit, the power driver circuit including: a high / low side driver module that is turned on or off according to a coordinated control signal, and is used to generate a high side driver signal according to a high side input signal and generate a low side driver signal according to a low side input signal when the power driver circuit is turned on; a coordinated processing module that is used to generate the coordinated control signal by comparing an input voltage with a threshold voltage, the threshold voltage being switched between a first voltage and a second voltage according to the coordinated control signal; and a temperature detection module that is connected to an output terminal of the coordinated processing module, and is used to detect a change in temperature, generate a detection signal that varies with temperature, and generate a detection increment and control whether to superimpose the detection increment on the detection signal and output it according to the coordinated control signal. The input voltage is related to the detection signal.

[0008] Optionally, the power driving circuit further includes: a detection module used to detect at least one of voltage, current, and temperature, and to generate an abnormality signal when an abnormality occurs; a logic processing module connected to an output terminal of the detection module and used to generate a protection signal based on the abnormality signal; and a first coordination control module connected between the output terminal of the logic processing module and the input terminal of the coordination processing module, and used to pull down the input voltage based on the protection signal.

[0009] Optionally, the first coordination control module includes a first MOSFET having a control terminal connected to the output terminal of the logic processing module, a first connection terminal connected to the input terminal of the coordination processing module, and a second connection terminal connected to ground.

[0010] Optionally, the collaborative processing module includes a voltage unit used to generate four original voltages whose numerical values ​​change monotonically and to select one of two original voltages whose numerical values ​​are larger and one of two original voltages whose numerical values ​​are smaller as the first voltage and the second voltage based on a selection signal, and a comparison unit connected to an output terminal of the voltage unit, used to compare the input voltage with the threshold voltage to generate the collaborative control signal and to select one of the first voltage and the second voltage as the threshold voltage based on the collaborative control signal.

[0011] Optionally, the voltage unit includes a voltage generator used for generating and outputting four original voltages, where when the input voltage exhibits a negative correlation with a change in temperature, the values ​​of the first original voltage, the second original voltage, the third original voltage, and the fourth original voltage change so as to monotonically decrease, and when the input voltage exhibits a positive correlation with a change in temperature, the values ​​of the first original voltage, the second original voltage, the third original voltage, and the fourth original voltage change so as to monotonically increase; a first selection switch having a control terminal receiving the selection signal, a first terminal receiving the first original voltage, a second terminal receiving the second original voltage, and a third terminal serving as a first output terminal of the voltage unit; and a second selection switch having a control terminal receiving the selection signal, a first terminal receiving the fourth original voltage, a second terminal receiving the third original voltage, and a third terminal serving as a second output terminal of the voltage unit.

[0012] Optionally, the voltage unit further includes a first resistor having a first terminal connected to the control terminals of the first selection switch and the second selection switch, receiving the selection signal, and having a second terminal connected to ground.

[0013] Optionally, the comparison unit includes a third selection switch having a control terminal for receiving the coordinated control signal, a first terminal for receiving the first voltage, a second terminal for receiving the second voltage, and a third terminal for generating the threshold voltage, and a comparator having a first input terminal connected to the third terminal of the third selection switch, a second input terminal for receiving the input voltage, and an output terminal serving as an output terminal of the comparison unit.

[0014] Optionally, the logic processing module is used to turn on or off based on a selection signal, and when on, to generate the protection signal based on the abnormality signal.

[0015] And / or, the power driving circuit further includes a second coordination control module, which is connected to the input terminal of the detection module and is used for controlling whether to input a detection signal to the detection module according to a selection signal.

[0016] Optionally, the second coordination control module includes a second MOSFET having a control terminal for receiving the selection signal, a first connection terminal connected to the input terminal of the detection module, and a second connection terminal connected to ground.

[0017] Optionally, the temperature detection module includes a temperature detection unit used for detecting changes in temperature and generating a detection signal that changes with temperature, an increment generation unit used for generating a detection increment, and a control switch having a control terminal connected to the output terminal of the collaborative processing module, a first terminal connected to the output terminal of the increment generation unit, and a second terminal connected to the output terminal of the temperature detection unit.

[0018] The present invention further provides a drive system. The drive system includes at least two of the power drive circuits described above. A selection signal terminal of one of the power drive circuits and a selection signal terminal of the other power drive circuits receive opposite level signals. A detection signal terminal of one of the power drive circuits is connected to a power supply voltage via a pull-up resistor or to ground via a pull-down resistor, and is also connected to an input voltage terminal of each of the power drive circuits. The detection signal terminals of the other power drive circuits are floating.

[0019] The present invention further provides a driving system. The driving system includes at least two of the power driving circuits described above. The selection signal terminals of the power driving circuits are connected to each other and receive a high level signal or a low level signal. The input voltage terminals of the power driving circuits are connected to the respective detection signal terminals. The detection signal terminals of the power driving circuits are connected to each other and are connected to a power supply voltage via a pull-up resistor or to ground via a pull-down resistor. Effect of the Invention

[0020] As described above, in the power driving circuit and driving system of the present invention, when multiple circuits operate in cooperation with each other, the threshold voltages of each circuit are differentiated and the detection increments are outputted by superimposing them, so that when any circuit is triggered, the other circuits can also respond quickly, and the responses of each circuit are made to match. In other words, by making the circuits respond in synchronization, the occurrence of abnormalities is avoided, and the reliability of the system when multiple circuits operate in cooperation with each other is improved. [Brief description of the drawings]

[0021] [Figure 1] FIG. 1 shows a schematic diagram of a power driver circuit according to the present invention. [Diagram 2]FIG. 2 is a schematic diagram of a drive system according to the present invention, showing a case in which the detection signal terminal of the power drive circuit 1 is connected to a power supply voltage via a pull-up resistor and is also connected to the input voltage terminal of each power drive circuit. [Diagram 3] FIG. 3 is a schematic diagram of a drive system according to the present invention, showing a case in which the detection signal terminal of the power drive circuit 1 is connected to ground via a pull-down resistor and is also connected to the input voltage terminal of each power drive circuit. [Figure 4] FIG. 4 is a schematic diagram of another driving system according to the present invention, in which the input voltage terminals of the power driving circuits are connected to respective detection signal terminals, and the detection signal terminals are connected to each other and to a power supply voltage via pull-up resistors. [Diagram 5] FIG. 5 is a schematic diagram of another driving system of the present invention, in which the input voltage terminals of each power driving circuit are connected to respective detection signal terminals, and the detection signal terminals are connected to each other and to ground via pull-down resistors. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] Hereinafter, the embodiments of the present invention will be described with reference to specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Furthermore, the present invention may be implemented or applied with other different specific embodiments. In addition, various supplements or modifications may be made to each of the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.

[0023] Please refer to Figures 1 to 5. It should be noted that the drawings provided in this embodiment are merely for a schematic explanation of the basic idea of ​​the present invention. The drawings only show assemblies related to the present invention, and are not based on the number, shape and size of the assemblies in actual implementation. The form, number and ratio of each assembly in actual implementation may be changed arbitrarily, and the layout and shape of the assemblies may be more complicated.

[0024] Example 1 As shown in Fig. 1, this embodiment provides a power driving circuit 10. The power driving circuit 10 includes a high / low side driving module 11, a coordination processing module 12 and a temperature detection module 13. In addition, the power driving circuit 10 further includes a detection module 14, a logic processing module 15 and a first coordination control module 16. In addition, the power driving circuit 10 further includes a second coordination control module 17.

[0025] The high / low side driving module 11 is turned on or off according to the coordinated control signal Tdn, and when it is on, it generates a high side driving signal HO according to the high side input signal HIN to drive the high side power transistor, and generates a low side driving signal LO according to the low side input signal LIN to drive the low side power transistor.

[0026] Specifically, when the coordinated control signal Tdn is invalid, the high / low side driving module 11 is turned on, and when the coordinated control signal Tdn is valid, the high / low side driving module 11 is turned off and stops operating, thereby realizing a protection function when the circuit overheats.

[0027] The coordination processing module 12 is used to compare an input voltage VIN with a threshold voltage VF to generate the coordination control signal Tdn. The threshold voltage VF is switched between a first voltage V1 and a second voltage V2 according to the coordination control signal Tdn.

[0028] Specifically, the collaboration module 12 includes a voltage unit 121 and a comparison unit 122 .

[0029] The voltage unit 121 is used to generate four original voltages whose values ​​change monotonically, and to select one of the two original voltages with larger values ​​and one of the two original voltages with smaller values ​​as the first voltage V1 and the second voltage V2 based on a selection signal SEL.

[0030] More specifically, the voltage unit 121 includes a voltage generator 1211, a first selection switch S1 and a second selection switch S2. In addition, the voltage unit 121 further includes a first resistor R1.

[0031] The voltage generator 1211 is used to generate and output four original voltages. The four original voltages include a first original voltage VF1, a second original voltage VF2, a third original voltage VF3, and a fourth original voltage VF4. When the input voltage VIN shows a negative correlation with a change in temperature, the values ​​of the first original voltage VF1, the second original voltage VF2, the third original voltage VF3, and the fourth original voltage VF4 change so as to monotonically decrease. That is, VF1>VF2>VF3>VF4. When the input voltage VIN shows a positive correlation with a change in temperature, the values ​​of the first original voltage VF1, the second original voltage VF2, the third original voltage VF3, and the fourth original voltage VF4 change so as to monotonically increase. That is, VF1 <VF2<VF3<VF4となる。

[0032] A control terminal of the first selection switch S1 receives the selection signal SEL, a first terminal receives the first original voltage VF1, a second terminal receives the second original voltage VF2, and a third terminal serves as a first output terminal of the voltage unit 121, making it possible to select and output one of the first original voltage VF1 and the second original voltage VF2 as the first voltage V1.

[0033] A control terminal of the second selection switch S2 receives the selection signal SEL, a first terminal receives the fourth source voltage VF4, a second terminal receives the third source voltage VF3, and a third terminal serves as the second output terminal of the voltage unit 121, making it possible to select and output one of the third source voltage VF3 and the fourth source voltage VF4 as the second voltage V2.

[0034] A first terminal of the first resistor R1 is connected to the control terminals of the first selection switch S1 and the second selection switch S2 and receives the selection signal SEL. A second terminal of the first resistor R1 is connected to ground, so that when there is no input of the selection signal SEL, the first resistor R1 can be regarded as being connected to ground.

[0035] In this embodiment, when the selection signal SEL is at a low level, the second terminal and the third terminal of each of the first selection switch S1 and the second selection switch S2 are connected. That is, the first selection switch S1 selects and outputs the second original voltage VF2 as the first voltage V1, and the second selection switch S2 selects and outputs the third original voltage VF3 as the second voltage V2. Also, when the selection signal SEL is at a high level, the first terminal and the third terminal of each of the first selection switch S1 and the second selection switch S2 are connected. That is, the first selection switch S1 selects and outputs the first original voltage VF1 as the first voltage V1, and the second selection switch S2 selects and outputs the fourth original voltage VF4 as the second voltage V2.

[0036] Of course, other selection designs may be used in other embodiments. For example, when the selection signal SEL is at a low level, the first selection switch S1 selects and outputs the first original voltage VF1 as the first voltage V1, and the second selection switch S2 selects and outputs the fourth original voltage VF4 as the second voltage V2. When the selection signal SEL is at a high level, the first selection switch S1 selects and outputs the second original voltage VF2 as the first voltage V1, and the second selection switch S2 selects and outputs the third original voltage VF3 as the second voltage V2.

[0037] The comparison unit 122 is connected to the output terminal of the voltage unit 121, and is used to compare the input voltage VIN with the threshold voltage VF to generate the coordinated control signal Tdn, and select one of the first voltage V1 and the second voltage V2 as the threshold voltage VF based on the coordinated control signal Tdn.

[0038] More specifically, the comparison unit 122 includes a third selection switch S3 and a comparator CMP1.

[0039] A control terminal of the third selection switch S3 receives the coordinated control signal Tdn, a first terminal is connected to the third terminal of the first selection switch S1 to receive the first voltage V1, a second terminal is connected to the third terminal of the second selection switch S2 to receive the second voltage V2, and the third terminal generates the threshold voltage VF.

[0040] A first input terminal of the comparator CMP1 is connected to the third terminal of the third selection switch S3 to receive the threshold voltage VF, a second input terminal of the comparator CMP1 receives the input voltage VIN, and an output terminal of the comparator CMP1 serves as the output terminal of the comparison unit 122 to generate the coordination control signal Tdn.

[0041] The coordination control signal Tdn output from the comparator CMP1 passes through the third selection switch S3, whereby a selection is made between the first voltage V1 and the second voltage V2, and a threshold voltage VF is obtained, and the threshold voltage VF is input again to the comparator CMP1 to form a hysteresis comparator. The comparator CMP1 is used to compare an input voltage VIN with a threshold voltage VF, and to output an inverted signal when the input voltage VIN reaches the threshold voltage VF.

[0042] In this embodiment, at the beginning of the operation of the circuit, when the comparator CMP1 does not output an inversion or has not yet output an inversion, the coordinated control signal Tdn (e.g., low level, i.e., invalid) controls the second terminal and the third terminal of the third selection switch S3 to select the second voltage V2 as the threshold voltage VF. At this time, the high / low side driving module 11 is controlled to be turned on. Also, when the comparator CMP1 outputs an inversion for the first time, the inverted coordinated control signal Tdn (e.g., high level, i.e., valid) controls the first terminal and the third terminal of the third selection switch S3 to select the first voltage V1 as the threshold voltage VF. At this time, the high / low side driving module 11 is controlled to be turned off.

[0043] Of course, other embodiments may have other selective designs. For example, at the beginning of the circuit operation, when the comparator CMP1 does not output or has not yet output an inversion, the coordinated control signal Tdn (e.g., low level, i.e., disabled) controls the first terminal and the third terminal of the third selection switch S3 to select the first voltage V1 as the threshold voltage VF. At this time, the high / low side driving module 11 is controlled to be turned on. Also, when the comparator CMP1 outputs an inversion for the first time, the inverted coordinated control signal Tdn (e.g., high level, i.e., enabled) controls the second terminal and the third terminal of the third selection switch S3 to select the second voltage V2 as the threshold voltage VF. At this time, the high / low side driving module 11 is controlled to be turned off.

[0044] It should be noted that, when the first terminal and the third terminal of the third selection switch S3 are connected, specifically, whether the first source voltage VF1 or the second source voltage VF2 is selected as the first voltage V1 is determined by the output of the first selection switch S1 in the voltage unit 121. Similarly, when the second terminal and the third terminal of the third selection switch S3 are connected, specifically, whether the third source voltage VF3 or the fourth source voltage VF4 is selected as the second voltage V2 is determined by the output of the second selection switch S2 in the voltage unit 121.

[0045] The temperature detection module 13 is connected to the output terminal of the collaborative processing module 12, and is used to detect a change in temperature, generate a detection signal ITS that changes with temperature, generate a detection increment, and control whether or not to superimpose the detection increment on the detection signal ITS and output it based on the collaborative control signal Tdn. The input voltage VIN is related to the detection signal ITS, and the input voltage VIN changes with a change in temperature.

[0046] Specifically, the temperature sensing module 13 includes a temperature sensing unit 131, an increment generating unit 132 and a control switch S4.

[0047] The temperature sensing unit 131 is used to sense a change in temperature and generate a sensing signal ITS, for example a current signal Is, which varies with temperature.

[0048] The increment generating unit 132 is used to generate a sensing increment, such as an incremental current ΔIs. In practical application, the increment generating unit 132 may generate one sensing increment of a fixed magnitude, or may generate at least two sensing increments of a fixed magnitude to switch the output. This does not affect the present embodiment.

[0049] The control switch S4 has a control terminal connected to the output terminal of the collaborative processing module 12 to receive the collaborative control signal Tdn, a first terminal connected to the output terminal of the increment generation unit 132 to receive the detected increment, and a second terminal connected to the output terminal of the temperature detection unit 131.

[0050] In this embodiment, when the cooperative control signal Tdn is invalid (e.g., low level), the control switch S4 is opened by the control of the cooperative control signal Tdn, and the detection increment is not superimposed on the detection signal ITS. At this time, the temperature detection module 13 outputs only the detection signal ITS. On the other hand, when the cooperative control signal Tdn is valid (e.g., high level), the control switch S4 is closed by the control of the cooperative control signal Tdn, and the detection increment is superimposed on the detection signal ITS. At this time, the temperature detection module 13 outputs the sum of the detection signal ITS and the detection increment.

[0051] Of course, in other embodiments, the temperature detection module 13 may be implemented in other ways, such as including a temperature control unit, a detection unit and an increment unit. The temperature control unit is used to detect a change in temperature and generate a temperature control signal. The detection unit is connected to an output terminal of the temperature control unit and is used to generate the detection signal according to the temperature control signal. The increment unit is connected to an output terminal of the temperature control unit and an output terminal of the collaborative processing module 12 and is used to generate the detection increment according to the temperature control signal, and to control whether to superimpose the detection increment on the detection signal and output it according to the collaborative control signal Tdn.

[0052] The detection module 14 is used for detecting at least one of a voltage, a current, and a temperature, and for generating an abnormality signal when an abnormality occurs.

[0053] Specifically, the detection module 14 includes an overcurrent detection unit 141 and an internal detection unit 142 .

[0054] The overcurrent detection unit 141 is used for comparing the detected current with a threshold current, and generating a current abnormality signal when the detected current is greater than the threshold current. More specifically, the overcurrent detection unit 141 is realized by a comparator CMP2. A first input terminal of the comparator CMP2 receives the threshold current, a second input terminal of the comparator CMP2 receives the detected current, and an output terminal of the comparator CMP2 generates the current abnormality signal.

[0055] The internal detection unit 142 is used for under-voltage detection and / or over-temperature detection. When performing under-voltage detection, it compares a detected voltage with an under-voltage threshold, and generates a voltage abnormality signal when the detected voltage is lower than the under-voltage threshold. When performing over-temperature detection, it compares a detected temperature with a threshold temperature, and generates a temperature abnormality signal when the detected temperature is higher than the threshold temperature. It is to be noted that if the internal detection unit 142 includes over-temperature detection, it can form a dual temperature protection mechanism together with the temperature detection module 13 and the collaboration module 12.

[0056] The logic processing module 15 is connected to the output terminal of the detection module 14 and is used for generating a protection signal Fdn based on the abnormal signal.

[0057] Specifically, the logic processing module 15 is controlled by the selection signal SEL, that is, the control terminal of the logic processing module 15 receives the selection signal SEL and is turned on or off according to the selection signal SEL, and when it is on, it is used to generate the protection signal Fdn according to the abnormality signal.

[0058] The first coordination control module 16 is connected between the output terminal of the logic processing module 15 and the input terminal of the coordination processing module 12, and is used to enter a protection state by pulling down the input voltage VIN based on the protection signal Fdn.

[0059] Specifically, the first coordination control module 16 is a first MOSFET having a control terminal connected to the output terminal of the logic processing module 15 to receive the protection signal Fdn, a first connection terminal connected to the input terminal of the coordination processing module 12, and a second connection terminal connected to ground. Includes M1.

[0060] The second coordination control module 17 is connected to the input terminal of the detection module 14, and is used for controlling whether to input a detection signal to the detection module 14 according to the selection signal SEL.

[0061] Specifically, the second coordination control module 17 includes a second MOSFET M2, the control terminal of which receives the selection signal SEL, the first connection terminal of which is connected to the input terminal of the detection module 14, and the second connection terminal of which is connected to ground.

[0062] Example 2 As shown in Figures 2 and 3, this embodiment provides a driving system. The driving system includes at least two power driving circuits 10 described in the first embodiment. A selection signal terminal (SEL) of one of the power driving circuits and a selection signal terminal of the other power driving circuits receive opposite level signals. A detection signal terminal (ITS) of one of the power driving circuits is connected to a power supply voltage via a pull-up resistor or to ground via a pull-down resistor, and is also connected to an input voltage terminal (VIN) of each power driving circuit. In addition, the detection signal terminal of the other power driving circuits is floating.

[0063] In practical application, when the detection signal is a pull-down current signal, sampling is performed in a manner in which the detection signal terminal of any of the power driving circuits is connected to the power supply voltage via a pull-up resistor to generate an input voltage (as shown in FIG. 2). At this time, when the pull-down current signal shows a positive correlation with the environmental parameter, the input voltage shows a negative correlation with the environmental parameter. Conversely, when the pull-down current signal shows a negative correlation with the environmental parameter, the input voltage shows a positive correlation with the environmental parameter.

[0064] When the detection signal is an output current signal, sampling is performed in a manner in which the detection signal terminal of any of the power drive circuits is connected to ground via a pull-down resistor to generate an input voltage (as shown in FIG. 3). In this case, when the output current signal shows a positive correlation with the environmental parameter, the input voltage shows a positive correlation with the environmental parameter. Conversely, when the output current signal shows a negative correlation with the environmental parameter, the input voltage shows a negative correlation with the environmental parameter.

[0065] In this embodiment, only one power driving circuit in the driving system is sampled to generate the input voltage, so specifically, whether sampling is performed through a pull-up resistor or through a pull-down resistor is determined only by whether the detection signal of the power driving circuit to be sampled is a pull-down current signal or an output current signal, and other power driving circuits are not involved. Therefore, the detection signal of other power driving circuits may be the same as or different from the power driving circuit to be sampled, and this does not affect this embodiment.

[0066] It should be noted that the selection signal terminal of any one of the power drive circuits and the selection signal terminal of the other power drive circuits receive opposite level signals means that when the selection signal terminal of any one of the power drive circuits receives a high level signal, the selection signal terminal of the other power drive circuits receives a low level signal, and when the selection signal terminal of any one of the power drive circuits receives a low level signal, the selection signal terminal of the other power drive circuits receives a high level signal. Also, a power drive circuit refers to any one of the power drive circuits in the drive system, and the other power drive circuits refer to all power drive circuits other than the one of the power drive circuits.

[0067] Next, referring to FIG. 2, an example will be given in which the number of power driving circuits is three, the detection signal shows a positive correlation with the change in temperature, and the input voltage shows a negative correlation with the change in temperature, to explain in detail the coordinated operation method of the driving system in this embodiment.

[0068] Connection method: In the driving system, the power driving circuit 1, the power driving circuit 2, and the power driving circuit 3 are arranged in order from the bottom. The selection signal terminal of the power driving circuit 1 receives a low level signal, and sets the second original voltage VF2 to the first voltage V1, and the third original voltage VF3 to the second voltage V2. The selection signal terminals of the power driving circuit 2 and the power driving circuit 3 receive a high level signal, and sets the first original voltage VF1 to the first voltage V1, and the fourth original voltage VF4 to the second voltage V2. At this time, VF1>VF2>VF3>VF4. The detection signal terminal of the power driving circuit 1 is connected to the power supply voltage VDD via a pull-up resistor R2, and is also connected to the input voltage terminals of the power driving circuit 1, the power driving circuit 2, and the power driving circuit 3. The detection signal terminals of the power driving circuit 2 and the power driving circuit 3 are floating. This makes it possible to obtain the input voltage VIN based on the detection signal of the power driving circuit 1 and provide it to the power driving circuit 1, the power driving circuit 2, and the power driving circuit 3.

[0069] Working process: When the drive system is operating normally, in the initial state, the detection increment ΔIs in the power drive circuit 1 is output without being superimposed. Also, the threshold voltage VF in the power drive circuit 1 is the third element voltage VF3, and the threshold voltage VF in the power drive circuit 2 and the power drive circuit 3 is the fourth element voltage VF4.

[0070] Since the input voltage VIN exhibits a negative correlation with the change in temperature, the input voltage VIN decreases with an increase in temperature. Then, when the input voltage VIN decreases to the threshold voltage VF, the comparator CMP1 outputs an inverted signal.

[0071] Since VF3>VF4, when VIN=VDD-Is*R2 drops to VF3, the comparator CMP1 in the power drive circuit 1 first outputs an inverted signal, and controls so that the detected increment ΔIs in the power drive circuit 1 is superimposed on the output. At this time, since VIN=VDD-Is*R2-ΔIs*R2, the drop in VIN rapidly increases by ΔV=ΔIs*R2.

[0072] If it is designed that ΔV > (VF3 - VF4), VIN can be rapidly decreased from VF3 to below VF4. As a result, the comparator CMP1 in the power drive circuit 2 and the power drive circuit 3 also outputs an inversion. Since these are performed in an extremely short time, it seems as if the power drive circuit 1, the power drive circuit 2, and the power drive circuit 3 output an inversion simultaneously. Thus, by controlling to turn off the corresponding high / low side drive module 11 to stop the operation, the temperature starts to decrease.

[0073] When the drive system stops operating, the detected increment ΔIs in the power drive circuit 1 is superimposed and output. Also, the threshold voltage VF in the power drive circuit 1 is switched to the second reference voltage VF2, and the threshold voltages VF in the power drive circuit 2 and the power drive circuit 3 are switched to the first reference voltage VF1.

[0074] Since the input voltage VIN shows a negative correlation with the change in temperature, the input voltage VIN increases as the temperature decreases. When the input voltage VIN rises to the threshold voltage VF, the comparator CMP1 outputs an inversion.

[0075] Because VF2 < VF1, when VIN = VDD - Is * R2 - ΔIs * R2 rises to VF2, the comparator CMP1 in the power drive circuit 1 first outputs an inversion and controls so that the detected increment ΔIs in the power drive circuit 1 is not superimposed and output. At this time, from VIN = VDD - Is * R2, the rising width of VIN rapidly increases by only ΔV’ = ΔIs * R2.

[0076] If it is designed that ΔV’ > (VF1 - VF2), VIN can be rapidly increased from VF2 to above VF1. As a result, the comparator CMP1 in the power drive circuit 2 and the power drive circuit 3 also outputs an inversion. Since these are performed in an extremely short time, it seems as if the power drive circuit 1, the power drive circuit 2, and the power drive circuit 3 output an inversion simultaneously. As described above, the abnormal state of the system is released and it becomes a normal operating state.

[0077] It should be noted that the detection signal terminals of the power driver circuit 2 and the power driver circuit 3 are floating. Therefore, even if the detection increments of the power driver circuit 2 and the power driver circuit 3 are operated correspondingly under the control of the respective coordination control signals, they are not output to the outside, so they do not affect the operation of the entire circuit.

[0078] Example 3 As shown in Figures 4 and 5, this embodiment provides a driving system. The driving system includes at least two power driving circuits 10 described in the first embodiment. The selection signal terminals (SEL) of the power driving circuits are connected to each other and receive a high level signal or a low level signal. The input voltage terminals (VIN) of the power driving circuits are connected to their respective detection signal terminals (ITS). The detection signal terminals of the power driving circuits are connected to each other and are connected to a power supply voltage via a pull-up resistor or to ground via a pull-down resistor.

[0079] In practical application, when the detection signal is a pull-down current signal, sampling is performed in a manner in which the detection signal terminal of the power driver is connected to the power supply voltage via a pull-up resistor to generate an input voltage (as shown in FIG. 4). At this time, when the pull-down current signal shows a positive correlation with the environmental parameter, the input voltage shows a negative correlation with the environmental parameter. Conversely, when the pull-down current signal shows a negative correlation with the environmental parameter, the input voltage shows a positive correlation with the environmental parameter.

[0080] When the detection signal is an output current signal, sampling is performed in a manner in which the detection signal terminal of the power driver is connected to ground via a pull-down resistor to generate the input voltage (as shown in FIG. 5). In this case, when the output current signal shows a positive correlation with the environmental parameter, the input voltage shows a positive correlation with the environmental parameter. Conversely, when the output current signal shows a negative correlation with the environmental parameter, the input voltage shows a negative correlation with the environmental parameter.

[0081] In this embodiment, since each power driving circuit in the driving system needs to perform sampling and generate a corresponding input voltage, the detection signals of each power driving circuit are the same, or are all pull-down current signals, or are all output current signals.

[0082] It should be noted that the threshold voltage of the comparator CMP1 in each power driving circuit is determined by whether the selection signal terminal of each power driving circuit accepts a high level signal or a low level signal. Therefore, whether to accept a high level signal or a low level signal should be set according to the difference in application needs, and this embodiment does not limit this.

[0083] Next, in combination with FIG. 4, a case will be illustrated in which the number of power driving circuits is three, the detection signal shows a positive correlation with the change in temperature, and the input voltage shows a negative correlation with the change in temperature, to explain in detail the coordinated operation method of the driving system in this embodiment.

[0084] Connection method: In the driving system, from the bottom up, there are a power driving circuit 1, a power driving circuit 2, and a power driving circuit 3. The selection signal terminals of the power driving circuits 1, 2, and 3 are connected to each other, and by receiving a low level signal, the second original voltage VF2 is set to the first voltage V1, and the third original voltage VF3 is set to the second voltage V2. In this case, VF1>VF2>VF3>VF4. Also, the input voltage terminals of the power driving circuits 1, 2, and 3 are connected to the respective detection signal terminals. Also, the respective detection signal terminals are connected to each other and to the power supply voltage VDD via a pull-up resistor.

[0085] Working process: When the drive system is operating normally, in the initial state, the detection increments ΔIs in the power drive circuit 1, the power drive circuit 2, and the power drive circuit 3 are output without being superimposed. Also, the threshold voltages VF in the power drive circuit 1, the power drive circuit 2, and the power drive circuit 3 are the third element voltage VF3.

[0086] Since the input voltage VIN shows a negative correlation with the change in temperature, the input voltage VIN of each power drive circuit decreases with the rise in temperature. At this time, when the input voltage VIN of the power drive circuit 1 drops to VF3, the comparator CMP1 in the power drive circuit 1 first outputs an inverted signal, and controls so that the detection increment ΔIs in the power drive circuit 1 is output. Then, due to the action of the detection increment ΔIs in the power drive circuit 1, the input voltage VIN of the power drive circuit 2 and the power drive circuit 3 rapidly drops by ΔV=ΔIs*R2.

[0087] If ΔV is designed to be larger than the distribution range of VF3 and to cover the offset voltage of the comparator, the input voltage VIN of the power driver circuit 2 and the power driver circuit 3 can be rapidly reduced to VF3 or less. As a result, the comparators CMP1 in the power driver circuit 2 and the power driver circuit 3 also output inversion. Since these are performed in an extremely short time, it appears as if the power driver circuit 1, the power driver circuit 2, and the power driver circuit 3 output inversion at the same time. As a result, the corresponding high / low side driver module 11 is controlled to be turned off and stopped operating, and the temperature starts to decrease.

[0088] When the drive system stops operating, the detection increments ΔIs in the power drive circuit 1, the power drive circuit 2, and the power drive circuit 3 are superimposed and output. In addition, the threshold voltages VF in the power drive circuit 1, the power drive circuit 2, and the power drive circuit 3 are switched to the second original voltage VF2.

[0089] Since the input voltage VIN shows a negative correlation with the change in temperature, the input voltage VIN of each power drive circuit increases with a decrease in temperature. At this time, when the input voltage VIN of the power drive circuit 1 rises to VF2, the comparator CMP1 in the power drive circuit 1 first outputs an inverted signal, controlling the output so that the detected increment ΔIs in the power drive circuit 1 is not superimposed. Then, since the detected increment ΔIs in the power drive circuit 1 is output without being superimposed, the input voltage VIN of the power drive circuit 2 and the power drive circuit 3 rises rapidly by ΔV'=ΔIs*R2.

[0090] If ΔV' is designed to be larger than the distribution range of VF2 and to cover the offset voltage of the comparator, the input voltage VIN of the power drive circuit 2 and the power drive circuit 3 can be rapidly raised to VF2 or higher. As a result, the comparators CMP1 in the power drive circuit 2 and the power drive circuit 3 also output inverted signals. Since this occurs in an extremely short time, it appears as if the power drive circuit 1, the power drive circuit 2, and the power drive circuit 3 output inverted signals at the same time. As a result, the abnormal state of the system is released and the system returns to normal operation.

[0091] In summary, in the power driving circuit and driving system of the present invention, when multiple circuits operate in cooperation with each other, the threshold voltages of each circuit are set differently, and the detection increments are outputted by superimposing them, so that when any circuit is triggered, the other circuits can respond quickly and the responses of each circuit are synchronized. That is, by making the circuits respond in synchronization, the occurrence of anomalies is avoided, and the reliability of the system when multiple circuits operate in cooperation with each other is improved. Therefore, the present invention effectively solves various shortcomings in the prior art and has a high industrial applicability.

[0092] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Those skilled in the art can supplement or modify the above embodiments without departing from the spirit and scope of the present invention. Therefore, any equivalent supplement or modification completed by a person skilled in the art without departing from the spirit and technical ideas presented in the present invention is still included in the scope of the claims of the present invention. [Explanation of symbols]

[0093] 10 Power Drive Circuit 11 High / Low Side Drive Module 12 Collaborative Processing Module 121 Voltage Unit 1211 Voltage Generator 122 Comparison Unit 13 Temperature detection module 131 Temperature detection unit 132 Incremental Generation Unit 14 Detection Module 141 Overcurrent detection unit 142 Internal detection unit 15 Logical Processing Module 16 First cooperative control module 17 Second Cooperative Control Module

Claims

1. A high / low side driving module is turned on or off according to a coordinated control signal, and is used to generate a high side driving signal according to a high side input signal and generate a low side driving signal according to a low side input signal when the high side driving module is turned on; a cooperative processing module for comparing an input voltage with a threshold voltage to generate the cooperative control signal, the threshold voltage being switched between a first voltage and a second voltage based on the cooperative control signal; a temperature detection module connected to an output terminal of the collaborative processing module, for detecting a change in temperature, generating a detection signal that changes with temperature, and generating a detection increment, and for controlling whether or not to superimpose the detection increment on the detection signal and output it based on the collaborative control signal; A power driver circuit, wherein said input voltage is related to said sense signal.

2. The power driver circuit further comprises: A detection module is used for detecting at least one of a voltage, a current, and a temperature, and for generating an abnormality signal when an abnormality occurs; a logic processing module connected to an output terminal of the detection module, the logic processing module being used for generating a protection signal according to the abnormality signal; 2. The power driving circuit as claimed in claim 1, further comprising: a first coordination control module connected between the output terminal of the logic processing module and the input terminal of the coordination processing module, the first coordination control module being used to pull down the input voltage based on the protection signal.

3. The first coordination control module is 3. The power driving circuit of claim 2, further comprising a first MOSFET having a control terminal connected to an output terminal of the logic processing module, a first connection terminal connected to an input terminal of the cooperative processing module, and a second connection terminal connected to ground.

4. The collaboration module includes: a voltage unit that generates four original voltages whose values ​​change monotonically, and selects one of two original voltages whose values ​​are greater than the first voltage and one of two original voltages whose values ​​are smaller than the second voltage, based on a selection signal; 4. The power driving circuit according to claim 1, further comprising: a comparison unit connected to an output terminal of the voltage unit, for comparing the input voltage with the threshold voltage to generate the coordinated control signal, and for selecting one of the first voltage and the second voltage as the threshold voltage based on the coordinated control signal.

5. The voltage unit is a voltage generator for generating and outputting four elemental voltages, wherein when the input voltage shows a negative correlation with a change in temperature, the values ​​of the first elemental voltage, the second elemental voltage, the third elemental voltage, and the fourth elemental voltage change so as to monotonically decrease, and when the input voltage shows a positive correlation with a change in temperature, the values ​​of the first elemental voltage, the second elemental voltage, the third elemental voltage, and the fourth elemental voltage change so as to monotonically increase; a first selection switch having a control terminal for receiving the selection signal, a first terminal for receiving the first original voltage, a second terminal for receiving the second original voltage, and a third terminal serving as a first output terminal of the voltage unit; and a second selection switch having a control terminal for receiving the selection signal, a first terminal for receiving the fourth original voltage, a second terminal for receiving the third original voltage, and a third terminal for serving as a second output terminal of the voltage unit.

6. The voltage unit further comprises:

6. The power driving circuit according to claim 5, further comprising a first resistor having a first terminal connected to the control terminals of the first selection switch and the second selection switch and receiving the selection signal, and a second terminal connected to ground.

7. The comparison unit is a third selection switch having a control terminal for receiving the coordinated control signal, a first terminal for receiving the first voltage, a second terminal for receiving the second voltage, and a third terminal for generating the threshold voltage; 5. The power driving circuit according to claim 4, further comprising: a comparator having a first input terminal connected to the third terminal of the third selection switch, a second input terminal receiving the input voltage, and an output terminal serving as the output terminal of the comparison unit.

8. The logic processing module is turned on or off according to a selection signal, and is used to generate the protection signal according to the abnormality signal when the logic processing module is turned on; And / or the power driving circuit further includes a second coordination control module, the second coordination control module being connected to the input terminal of the detection module and used to control whether or not to input a detection signal to the detection module based on the selection signal.

9. The second coordination control module is 9. The power driver circuit of claim 8, further comprising a second MOSFET having a control terminal for receiving the selection signal, a first connection terminal connected to the input terminal of the detection module, and a second connection terminal connected to ground.

10. The temperature detection module includes: a temperature sensing unit adapted to sense changes in temperature and generate said sensing signal which varies with temperature; an increment generation unit used for generating said sensing increments; The power driving circuit of any one of claims 1 to 3, further comprising a control switch having a control terminal connected to the output terminal of the collaborative processing module, a first terminal connected to the output terminal of the increment generation unit, and a second terminal connected to the output terminal of the temperature detection unit.

11. The temperature detection module includes: a temperature control unit adapted to sense changes in temperature and generate a temperature control signal; a sensing unit connected to an output terminal of the temperature control unit, the sensing unit being used for generating the sensing signal according to the temperature control signal; The power driving circuit according to any one of claims 1 to 3, further comprising: an increment unit connected to an output terminal of the temperature control unit and an output terminal of the collaborative processing module, generating the detection increment based on the temperature control signal, and used to control whether or not to superimpose the detection increment on the detection signal and output it based on the collaborative control signal.

12. The detection module includes: an overcurrent detection unit, which is used for comparing a detection current with a threshold current, and generating a current abnormality signal when the detection current is greater than the threshold current; 3. The power driving circuit according to claim 2, further comprising an internal detection unit for performing undervoltage detection and / or overheat detection, the internal detection unit being configured to compare a detected voltage with an undervoltage threshold and generate a voltage abnormality signal if the detected voltage is lower than the undervoltage threshold when performing undervoltage detection, and to compare a detected temperature with a threshold temperature and generate a temperature abnormality signal if the detected temperature is higher than the threshold temperature when performing overheat detection.

13. A power supply comprising at least two power drive circuits according to any one of claims 1 to 12, A driving system characterized in that a selection signal terminal of any one of the power driving circuits and a selection signal terminal of the other power driving circuits receive opposite level signals, a detection signal terminal of any one of the power driving circuits is connected to a power supply voltage via a pull-up resistor or to ground via a pull-down resistor, and is also connected to an input voltage terminal of each power driving circuit, and the detection signal terminals of the other power driving circuits are floating.

14. A power supply comprising at least two power drive circuits according to any one of claims 1 to 12, A driving system characterized in that the selection signal terminals of each power driving circuit are connected to each other and receive a high level signal or a low level signal, the input voltage terminals of each power driving circuit are connected to the respective detection signal terminals, and the detection signal terminals of each power driving circuit are connected to each other and are connected to a power supply voltage via a pull-up resistor or to ground via a pull-down resistor.

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