High-side switching circuit, control method and electronic equipment

Abstract

The invention discloses a high-side switching circuit, a control method and electronic equipment, the high-side switching circuit comprises an enable signal port, a control unit and a power tube, the enable signal port is used for inputting an enable signal; the control unit is suitable for determining a target driving mode based on the enable signal; and on the basis of the driving configuration parameter corresponding to the target driving mode, controlling the on-off state of the power tube, the driving configuration parameters comprise at least one of the following parameters: a conduction speed, a current-limiting protection threshold value and a temperature rise protection threshold value; the enable signal is a first enable signal, and the target driving mode is an inductive / resistive load driving mode; the enable signal is a second enable signal, and the target driving mode is a capacitive load driving mode. According to the scheme, corresponding driving modes are selected according to different types of loads, and optimization of the driving strategy is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic circuits, and in particular to a high-side switch circuit and a control method, and electronic equipment. Background Art

[0002] The high-side switch chip provides a voltage and current path to the external load by controlling the conduction of the internal power tube (MOSFET). The external load of the high-side switch chip includes inductive loads (such as relays, solenoid valves, etc.), resistive loads (such as heating wires, etc.) and capacitive loads (such as various automotive controllers, which usually have large capacitors at the input end).

[0003] In the prior art, a fixed driving mode is usually used to drive an external load, that is, the same driving mode is used to drive an inductive load, a resistive load, and a capacitive load. However, when a capacitive load is driven by a fixed driving mode, a large current overshoot is easily generated, and the power tube is seriously heated. Summary of the invention

[0004] The present invention aims at providing a high-side switch circuit that can select a corresponding driving mode based on different types of loads to optimize the driving strategy.

[0005] In a first aspect, the present invention provides a high-side switch circuit, comprising: an enable signal port, a control unit and a power tube, wherein: the enable signal port inputs an enable signal; the control unit is suitable for determining a target drive mode based on the enable signal; and, based on drive configuration parameters corresponding to the target drive mode, controlling the on-off state of the power tube; the drive configuration parameters include at least one of the following: conduction speed, current limiting protection threshold, temperature rise protection threshold; the enable signal is a first enable signal, and the target drive mode is an inductive / resistive load drive mode; the enable signal is a second enable signal, and the target drive mode is a capacitive load drive mode.

[0006] By inputting different enable signals to the enable signal port of the high-side switch circuit, the control unit determines the target drive mode associated with the enable signal, and then selects the drive configuration parameters corresponding to the target drive mode to control the on-off state of the power tube. In this way, the corresponding drive mode can be selected based on different types of loads to achieve the optimization of the drive strategy.

[0007] Optionally, the high-side switch circuit also includes: a signal detection unit, coupled to the enable signal port, suitable for outputting a load flag signal of a corresponding level based on the enable signal; the control unit, suitable for determining the target drive mode based on the level of the load flag signal and the enable signal.

[0008] Optionally, the signal detection unit is suitable for latching the load flag signal as a first level and outputting it to the control unit when N consecutive PWM square waves are detected; and, when no PWM square wave is detected, or the number of consecutive PWM square waves detected is less than N, setting the level of the load flag signal to a second level; the first level is different from the second level; N is a positive integer and N≥2.

[0009] Optionally, the first enable signal is a continuous high-level signal, and the second enable signal includes M continuous PWM square waves and a continuous high-level signal; M is a positive integer and M≥N; the control unit is suitable for determining that the target drive mode is the capacitive load drive mode when the level of the load flag signal is the first level; and, when the level of the load flag signal is the second level, determining that the target drive mode is the inductive / resistive load drive mode.

[0010] The optional first enable signal includes M continuous PWM square waves and a continuous high-level signal, and the second enable signal is a continuous high-level signal; M is a positive integer and M≥N; the control unit is suitable for determining that the target drive mode is the inductive / resistive load drive mode when the level of the load flag signal is the first level; and determining that the target drive mode is the capacitive load drive mode when the level of the load flag signal is the second level.

[0011] Optionally, the signal detection unit is also suitable for adjusting the level of the load flag signal to the second level after detecting a low level signal input to the enable signal port after latching the load flag signal to the first level, and after the duration of the low level signal reaches a preset first duration.

[0012] The high-side switch circuit also includes a signal detection unit, which can latch the load flag signal when detecting N consecutive PWM square waves. When a short circuit or other fault occurs in the high-side switch circuit, the control unit can determine the target drive mode and restart the power tube based on the level of the load flag signal and the enable signal. Thus, the control unit can adaptively determine the target drive mode to restart the power tube.

[0013] Optionally, the control unit is adapted to output a shutdown control signal to shut down the power tube after a continuous low-level signal is input to the enable signal port.

[0014] Optionally, the control unit is also suitable for obtaining the real-time voltage of the load capacitor when the target driving mode is the capacitive load driving mode; when it is detected that the real-time voltage of the load capacitor reaches a preset voltage value, the second conduction speed is adjusted to the first conduction speed, and the second temperature rise protection threshold is adjusted to the first temperature rise protection threshold; wherein, the second conduction speed is the conduction speed corresponding to the capacitive load driving mode, and the second temperature rise protection threshold is the temperature rise protection threshold corresponding to the capacitive load driving mode; the first conduction speed is the conduction speed corresponding to the inductive / resistive load driving mode, and the first temperature rise protection threshold is the temperature rise protection threshold corresponding to the inductive / resistive load driving mode; the first conduction speed is greater than the second conduction speed, and the first temperature rise protection threshold is greater than the second temperature rise protection threshold; the load capacitor is coupled to the output end of the high-side switching circuit.

[0015] In a second aspect, the present invention also provides a control method for a high-side switch circuit, comprising: obtaining an enable signal; determining a target drive mode based on the enable signal; controlling the on-off state of a power tube in the high-side switch circuit based on drive configuration parameters corresponding to the target drive mode; the drive configuration parameters comprising at least one of the following: conduction speed, current limiting protection threshold, temperature rise protection threshold; the enable signal is a first enable signal, and the target drive mode is an inductive / resistive load drive mode; the enable signal is a second enable signal, and the target drive mode is a capacitive load drive mode.

[0016] In a third aspect, the present invention further provides an electronic device, comprising the high-side switch circuit provided by any of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a structural schematic diagram of a high-side switch circuit in an embodiment of the present invention;

[0018] Figure 2 is a schematic diagram of operating waveforms of a high-side switch circuit in an embodiment of the present invention;

[0019] Figure 3 is a schematic diagram of operating waveforms of another high-side switch circuit in an embodiment of the present invention;

[0020] Figure 4 is a schematic diagram of working waveforms of another high-side switch circuit in an embodiment of the present invention;

[0021] Figure 5 is a schematic diagram of working waveforms of another high-side switch circuit in an embodiment of the present invention;

[0022] Figure 6 It is a flow chart of a control method of a high-side switch circuit in an embodiment of the present invention. DETAILED DESCRIPTION

[0023] In the prior art, a fixed driving mode is usually used to drive the external load, that is, the same driving mode is used to drive the inductive load, resistive load and capacitive load. When a fixed driving mode is used to drive a capacitive load, a large current overshoot is easily generated, causing a large impact on the wiring harness. During the charging process of the capacitive load, the voltage and current at both ends of the power tube are high, which will cause the power tube to heat up severely and affect the service life of the high-side switch chip.

[0024] In the embodiment of the present invention, by inputting different enable signals to the enable signal port of the high-side switch circuit, the control unit determines the target drive mode associated with the enable signal, and then selects the drive configuration parameters corresponding to the target drive mode to control the on-off state of the power tube. Thus, the corresponding drive mode can be selected based on different types of loads to achieve the optimization of the drive strategy.

[0025] In order to make the above-mentioned objects, features and beneficial effects of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0026] The embodiment of the present invention provides a high-side switch circuit 10, comprising: an enable signal port, a control unit and a power tube, wherein:

[0027] The enable signal port EN can input an enable signal;

[0028] The control unit can determine the target drive mode based on the enable signal input to the enable signal port EN; and control the on / off state of the power tube based on the drive configuration parameters corresponding to the target drive mode; the drive configuration parameters can include at least one of the following: conduction speed, current limiting protection threshold, and temperature rise protection threshold. The conduction speed is the time required for the power tube to switch from the off state to the on state.

[0029] In a specific implementation, an enable signal may be input to the enable signal port EN through an external control device.

[0030] In the embodiment of the present invention, the enable signal may be a first enable signal or a second enable signal, and the first enable signal is different from the second enable signal. The target driving mode may include an inductive / resistive load driving mode and a capacitive load driving mode.

[0031] In a specific implementation, when the enable signal is a first enable signal, the target driving mode is an inductive / resistive load driving mode; when the enable signal is a second enable signal, the target driving mode is a capacitive load driving mode.

[0032] Alternatively, when the enable signal is the first enable signal, the target driving mode is the capacitive load driving mode; when the enable signal is the second enable signal, the target driving mode is the inductive / resistive load driving mode.

[0033] In a specific implementation, the driving configuration parameters corresponding to the inductive / resistive load driving mode (hereinafter referred to as the first driving configuration parameters) are different from the driving configuration parameters corresponding to the capacitive load driving mode (hereinafter referred to as the second driving configuration parameters).

[0034] The first driving configuration parameter may include a first conduction speed, a first temperature rise protection threshold, and a first current limiting protection threshold. Correspondingly, the second driving configuration parameter may include a second conduction speed, a second temperature rise protection threshold, and a second current limiting protection threshold.

[0035] The first conduction speed may be higher than the second conduction speed, the first temperature rise protection threshold may be higher than the second temperature rise protection threshold, and the first current limiting protection threshold may be higher than the second current limiting protection threshold.

[0036] In a specific implementation, the first enable signal may be a continuous high level signal, and the second enable signal may include two parts, the first part being M continuous pulse width modulation (PWM) square waves, and the second part being a continuous high level signal, and the first part is located before the second part in terms of timing.

[0037] Alternatively, the first enable signal includes two parts, the first part is M continuous PWM square waves, and the second part is a continuous high level signal, and the first part is before the second part in timing; the second enable signal is a continuous high level signal; M is a positive integer and M≥2.

[0038] The value of M can be set according to the specific application scenario. For example, M=10. For another example, M=20.

[0039] Take the case where the first enable signal is a continuous high-level signal and the second enable signal is M continuous PWM square waves as an example. When the control unit detects that the input enable signal is a continuous high-level signal, it can determine that the target drive mode is an inductive / resistive load drive mode, obtain the first drive configuration parameter, and control the on / off state of the power tube based on the first drive configuration parameter; when the control unit detects that the input enable signal is N continuous PWM square waves, it can determine that the target drive mode is a capacitive load drive mode, obtain the second drive configuration parameter, and control the on / off state of the power tube based on the second drive configuration parameter. N is a positive integer and M≥N≥2.

[0040] In a specific implementation, the output end of the control unit can be coupled to the control end of the power tube. The control unit can generate a first control signal to control the power tube based on the acquired first drive configuration parameter; the control unit can generate a second control signal to control the power tube based on the acquired second drive configuration parameter.

[0041] In a specific implementation, the control unit may be a chip or circuit structure with a specific data processing function such as a central processing unit (CPU) or a microprocessor (MCU). An internal storage module may be provided inside the control unit for storing the first drive configuration parameter and the second drive configuration parameter. The control unit may directly obtain the first drive configuration parameter or the second drive configuration parameter from the internal storage module based on an enable signal.

[0042] Alternatively, a memory may be provided in the high-side switch circuit, the memory is coupled to the control unit, and the memory stores the first drive configuration parameter and the second drive configuration parameter. The control unit may obtain the first drive configuration parameter or the second drive configuration parameter from the memory based on the enable signal.

[0043] In an embodiment of the present invention, the high-side switch circuit may further include: a signal detection unit coupled to the enable signal port EN, adapted to output a load flag signal of a corresponding level based on the enable signal; and a control unit adapted to determine a target drive mode based on the level of the load flag signal.

[0044] In a specific implementation, the input end of the signal detection unit may be coupled to the enable signal port, and the output end of the signal detection unit may be coupled to the control unit. The signal detection unit may detect the enable signal input to the enable signal port.

[0045] When the signal detection unit detects that an enable signal (a first enable signal or a second enable signal) is input to the enable signal port, the number of received PWM square waves can be detected. If N consecutive PWM square waves are detected, the signal detection unit can output a load flag signal of a first level and latch the level of the load flag signal as the first level; if no PWM square wave is detected, or no consecutive N PWM square waves are detected, a load flag signal of a second level is output. The above-mentioned first level is different from the second level.

[0046] When the signal detection unit latches the load flag signal as the first level, if it is detected that the input signal of the enable signal port is a low level signal (that is, the enable signal port stops inputting the enable signal), and the duration of the low level signal reaches the preset first duration, the level of the load flag signal can be switched from the first level to the second level. When the signal detection unit latches the load flag signal as the first level, if it is detected that the input signal of the enable signal port is a low level signal, but the duration of the low level signal does not reach the first duration, the level of the load flag signal can be maintained at the first level.

[0047] In some embodiments, the first level is a high level, and the second level is a low level. The first duration mentioned above can be set according to specific application scenarios, such as being set to 1 second (s), or being set to 5s.

[0048] Take the first level as a high level and the second level as a low level as an example:

[0049] If the signal detection unit detects that the enable signal port input is a continuous high level signal, the level of the load flag signal output by the signal detection unit is a low level; accordingly, the control unit selects the first drive configuration parameter to control the on / off state of the power tube.

[0050] If the signal detection unit detects that a PWM square wave is input to the enable signal port, and detects N consecutive PWM square waves, the level of the output load flag signal is high, and the high level of the load flag signal is latched; accordingly, the control unit selects the second drive configuration parameter to control the on-off state of the power tube. If the input signal of the enable signal port jumps to a continuous low-level signal, and the duration of the low-level signal reaches the first duration, the signal detection unit switches the level of the output load flag signal from a high level to a low level. When the level of the load flag signal is low, the control unit selects the first drive configuration parameter to control the on-off state of the power tube.

[0051] That is to say, when the signal detection unit detects that the enable signal port input is a PWM square wave, and detects that the number of PWM square waves does not reach N, the level of the output load flag signal is low. After detecting N consecutive PWM square waves, the level of the output load flag signal jumps from low to high.

[0052] In summary, in the embodiment of the present invention, when the enable signal port inputs a continuous low-level signal, the high-side switch circuit can control the power tube to be in an off state. When the enable signal port inputs an enable signal, the high-side switch circuit can select the first drive configuration parameter or the second drive configuration parameter based on whether the enable signal is the first enable signal or the second enable signal, and control the on-off state of the power tube.

[0053] In an embodiment of the present invention, when the target driving mode is a capacitive load driving mode, the control unit can obtain the real-time voltage of the load capacitor. When it is detected that the real-time voltage of the load capacitor reaches a preset voltage value, the conduction speed of the power tube can be controlled to be adjusted from the second conduction speed to the first conduction speed, and the second temperature rise protection threshold can be adjusted to the first temperature rise protection threshold.

[0054] In some embodiments, the difference between the drain voltage and the source voltage of the power tube can be obtained to determine whether the real-time voltage of the load capacitor reaches the preset voltage value. When it is detected that the difference between the drain voltage and the source voltage of the power tube is less than a preset threshold, it can be determined that the real-time voltage of the load capacitor reaches the preset voltage value.

[0055] The preset threshold value can be set based on a specific application scenario. For example, the preset threshold value is 2V.

[0056] In a specific implementation, the first conduction speed is the conduction speed corresponding to the inductive / resistive load driving mode, the second conduction speed is the conduction speed corresponding to the capacitive load driving mode, and the first conduction speed is greater than the second conduction speed; the first temperature rise protection threshold is the temperature rise protection threshold corresponding to the inductive / resistive load driving mode, the second temperature rise protection threshold is the temperature rise protection threshold corresponding to the capacitive load driving mode, and the first temperature rise protection threshold is greater than the second temperature rise protection threshold.

[0057] The following describes the working process of the high-side switch circuit by taking the case where the first enable signal is a continuous high-level signal and the second enable signal includes M continuous PWM square waves and a continuous high-level signal as an example.

[0058] The enable signal port inputs a first enable signal. The signal detection unit detects the first enable signal and outputs a low-level load flag signal. The control unit determines that the target drive mode is an inductive / resistive load drive mode based on the first enable signal and the load flag signal, and selects the first drive configuration parameter to control the on / off state of the power tube.

[0059] When a continuous low-level signal is input to the enable signal port, the control unit can control the power tube to switch from the on state to the off state.

[0060] Reference Figure 2 , a schematic diagram of the working waveform of a high-side switch circuit is given. Figure 2 In the embodiment, the enable signal is a first enable signal.

[0061] Figure 2 In the example, the enable signal port EN inputs the first enable signal. The level of the load flag signal output by the signal detection unit is low. The control unit controls the power tube to turn on in the inductive / resistive load driving mode. The power tube conducts faster and the output voltage V OUTand output current I OUT The rising speed is faster. Temperature rise protection threshold T SW Choose a higher T SW(H) , T J is the junction temperature, T SD is the current limiting protection threshold, T MOS is the temperature of the power tube, T REF is the reference temperature.

[0062] The second enable signal is input to the enable signal port. The signal detection unit detects the second enable signal. When the signal detection unit detects that the number of PWM square waves is less than N, the level of the load flag signal output by the signal detection unit is low. The control unit controls the power tube to be in the disconnected state.

[0063] When the signal detection unit detects that the number of PWM square waves is equal to N, the level of the output load flag signal jumps from a low level to a high level. The signal detection unit latches the level of the load flag signal. The control unit detects the second enable signal, and after detecting the high-level load flag signal, determines that the target drive mode is a capacitive load drive mode. The control unit controls the on-off state of the power tube based on the second drive configuration parameter.

[0064] Reference Figure 3 , a schematic diagram of the working waveform of another high-side switch circuit is given. Figure 3 In the embodiment, the enable signal is a second enable signal.

[0065] In the capacitive load driving mode, the power tube conduction speed is slow and the output voltage V OUT and output current I OUT The rising speed is slow. Temperature rise protection threshold T SW Select a lower T SW(L) When the power tube is turned on and the temperature rise protection threshold is triggered, the control unit controls the power tube to switch to the off state; when the temperature of the power tube drops, the control unit can control the power tube to turn on again. Thus, the cycle continues until the output capacitor voltage reaches the input voltage VS.

[0066] In a specific implementation, in order to improve the load capacity after the output capacitor is charged, after the output capacitor is charged to a certain value, the second conduction speed is changed to the first conduction speed, and the second temperature rise protection threshold is changed to the first protection threshold. Figure 3 As shown, when the output capacitor voltage reaches VS-VDS, the second conduction speed is changed to the first conduction speed, and the second temperature rise protection threshold T SW(L) Change to the first protection threshold T SW(H) .

[0067] In a specific implementation, when the enable signal is the first enable signal, after a short circuit to ground occurs in the high-side switch circuit, the power tube triggers the current limiting protection and is turned off. After waiting for a period of time, the control unit can control the power tube to try to restart. Since the level of the load flag signal is a low level and the enable signal is a continuous high level signal, the control unit can determine that the target drive mode is an inductive / resistive load drive mode, and then use the first drive configuration parameter to control the on / off state of the power tube.

[0068] Reference Figure 4 , another working waveform diagram of a high-side switch circuit is given. Figure 4 In the embodiment, the enable signal is a first enable signal.

[0069] Figure 4 In the example, at time t1, a ground fault occurs in the high-side switch circuit, and the power tube triggers the current limiting protection and shuts down. At time t2, the control unit controls the power tube to restart. Since the level of the load flag signal is low, the control unit uses the first drive configuration parameter to control the on-off state of the power tube. At time t3, since the short-circuit fault still exists, the power tube current limiting protection is triggered again.

[0070] In a specific implementation, when the enable signal is the second enable signal, after a short circuit to ground occurs in the high-side switch circuit, the power tube triggers the current limiting protection and is turned off. After waiting for a period of time, the control unit can control the power tube to try to restart. Since the level of the load flag signal is a high level, the control unit can determine that the target drive mode is a capacitive load drive mode, and then use the second drive configuration parameter to control the on-off state of the power tube.

[0071] Reference Figure 5 , another working waveform diagram of a high-side switch circuit is given. Figure 5 In the embodiment, the enable signal is a second enable signal.

[0072] Figure 5 In the example, at time t1, a ground fault occurs in the high-side switch circuit, and the power tube triggers the current limiting protection and shuts down. At time t2, the control unit controls the power tube to restart. Since the level of the load flag signal is high, the control unit can directly use the second drive configuration parameter to control the on and off state of the power tube. As a result, the control unit restarts the power tube in capacitive load drive mode. At time t3, the input signal of the enable signal port jumps to a low-level signal, and the control unit controls the power tube to switch from the on state to the off state. At time t4, the duration of the low-level signal of the enable signal port reaches t RST (first duration), the level of the load flag signal jumps to a low level.

[0073] In summary, by inputting different enable signals to the enable signal port of the high-side switch circuit, the control unit determines the target drive mode associated with the enable signal, and then selects the drive configuration parameters corresponding to the target drive mode to control the on-off state of the power tube. In this way, the corresponding drive mode can be selected based on different types of loads to achieve the optimization of the drive strategy.

[0074] In addition, the high-side switch circuit further includes a signal detection unit, which can latch the load flag signal when detecting N consecutive PWM square waves. When a short circuit or other fault occurs in the high-side switch circuit, the control unit can determine the target drive mode and restart the power tube based on the level of the load flag signal and the enable signal. Thus, the control unit can adaptively determine the target drive mode to restart the power tube.

[0075] In an embodiment of the present invention, the high-side switch circuit may further include a temperature rise protection unit and a current limiting protection unit, wherein:

[0076] The temperature rise protection unit can be coupled to the control unit. When it is detected that the real-time temperature of the power tube is greater than the preset temperature rise protection threshold (the first temperature rise protection threshold, the second temperature rise protection threshold), a temperature protection trigger signal can be output to the control unit. When the control unit receives the temperature protection trigger signal, it can control the power tube to disconnect.

[0077] The current limiting protection unit can be coupled to the control unit. When it is detected that the current flowing through the power tube exceeds a preset current limiting protection threshold (the first current limiting protection threshold, the second current limiting protection threshold), a short circuit trigger signal can be output to the control unit. When the control unit receives the short circuit trigger signal, it can control the power tube to disconnect.

[0078] Reference Figure 6 , a flow chart of a control method of a high-side switch circuit in an embodiment of the present invention is given. Figure 6 The control method shown in can be executed by the control unit provided in the above embodiments.

[0079] Step 601, obtaining an enable signal.

[0080] Step 602: determine a target driving mode based on an enable signal.

[0081] Step 603 : controlling the on / off state of the power tube in the high-side switch circuit based on the drive configuration parameters corresponding to the target drive mode.

[0082] In a specific implementation, the specific execution process of the above steps 601 to 603 may correspond to the description of the control unit in the above embodiment, which will not be repeated here.

[0083] A person skilled in the art may understand that all or part of the steps in the various methods of the above embodiments may be completed by instructing the relevant hardware through a program, and the program may be stored in a computer-readable storage medium, which may include: ROM, RAM, disk or CD, etc.

[0084] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A high-side switch circuit, characterized in that: include: Enable signal port, control unit, power tube, signal detection unit, where: The enable signal port inputs an enable signal; The signal detection unit is coupled to the enable signal port and is adapted to output a load flag signal of a corresponding level based on the enable signal, including: when N consecutive PWM square waves are detected, latching the load flag signal as a first level and outputting it to the control unit; and when no PWM square wave is detected, or the number of consecutive PWM square waves detected is less than N, setting the level of the load flag signal to a second level; the first level is different from the second level; N is a positive integer and N≥2; The control unit is adapted to determine a target drive mode based on the level of the enable signal and the load flag signal; and control the on / off state of the power tube based on a drive configuration parameter corresponding to the target drive mode; the drive configuration parameter includes at least one of the following: a conduction speed, a current limiting protection threshold, and a temperature rise protection threshold; The enable signal is a first enable signal, and the target driving mode is an inductive / resistive load driving mode; the enable signal is a second enable signal, and the target driving mode is a capacitive load driving mode.

2. The high side switch circuit according to claim 1, characterized in that: The first enable signal is a continuous high level signal, and the second enable signal includes M continuous PWM square waves and a continuous high level signal; M is a positive integer and M≥N; The control unit is suitable for determining that the target drive mode is the capacitive load drive mode when the level of the load flag signal is the first level; and determining that the target drive mode is the inductive / resistive load drive mode when the level of the load flag signal is the second level.

3. The high side switch circuit according to claim 1, characterized in that: The first enable signal includes M continuous PWM square waves and a continuous high level signal, and the second enable signal is a continuous high level signal; M is a positive integer and M≥N; The control unit is adapted to determine that the target driving mode is the inductive / resistive load driving mode when the level of the load flag signal is the first level; And, when the level of the load flag signal is the second level, the target driving mode is determined to be the capacitive load driving mode.

4. The high side switch circuit according to any one of claims 1 to 3, characterized in that: The signal detection unit is also suitable for adjusting the level of the load flag signal to the second level after detecting that the enable signal port inputs a low level signal after latching the load flag signal to the first level and the duration of the low level signal reaches a preset first duration.

5. The high side switch circuit according to claim 1, characterized in that: The control unit is adapted to input a low level signal at the enable signal port and output a shutdown control signal to shut down the power tube.

6. The high side switch circuit according to claim 1, characterized in that: The control unit is further adapted to obtain the real-time voltage of the load capacitor when the target driving mode is the capacitive load driving mode; when it is detected that the real-time voltage of the load capacitor reaches a preset voltage value, adjust the second conduction speed to the first conduction speed, and adjust the second temperature rise protection threshold to the first temperature rise protection threshold; Among them, the second conduction speed is the conduction speed corresponding to the capacitive load driving mode, and the second temperature rise protection threshold is the temperature rise protection threshold corresponding to the capacitive load driving mode; the first conduction speed is the conduction speed corresponding to the inductive / resistive load driving mode, and the first temperature rise protection threshold is the temperature rise protection threshold corresponding to the inductive / resistive load driving mode; the first conduction speed is greater than the second conduction speed, and the first temperature rise protection threshold is greater than the second temperature rise protection threshold; the load capacitor is coupled to the output end of the high-side switch circuit.

7. A control method for a high-side switch circuit, characterized in that: Suitable for controlling the high-side switch circuit according to any one of claims 1 to 6; the control method comprises: Get the enable signal and load flag signal; Determining a target driving mode based on the levels of the enable signal and the load flag signal; Based on the drive configuration parameters corresponding to the target drive mode, the on-off state of the power tube in the high-side switch circuit is controlled; the drive configuration parameters include at least one of the following: conduction speed, current limiting protection threshold, temperature rise protection threshold; the enable signal is a first enable signal, and the target drive mode is an inductive / resistive load drive mode; the enable signal is a second enable signal, and the target drive mode is a capacitive load drive mode.

8. An electronic device, characterized in that: It comprises a high-side switch circuit as described in any one of claims 1 to 6.

Images