CN216720891U - High-side driving circuit and controller with same - Google Patents
High-side driving circuit and controller with same Download PDFInfo
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- CN216720891U CN216720891U CN202123348824.2U CN202123348824U CN216720891U CN 216720891 U CN216720891 U CN 216720891U CN 202123348824 U CN202123348824 U CN 202123348824U CN 216720891 U CN216720891 U CN 216720891U
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Abstract
The application relates to the technical field of electronic appliances, and provides a high-side drive circuit and a controller with the same. The circuit comprises a sampling module, a switch module and an overcurrent protection module, wherein the sampling module is configured to convert the output current of a power supply into a first voltage signal and output the first voltage signal to the overcurrent protection module; the overcurrent protection module is configured to convert the first voltage signal into a second voltage signal and output the second voltage signal to the switch module when the received first voltage signal is greater than a preset voltage threshold; the switch module is configured to switch to an off state when receiving the second voltage signal output by the over-current protection module. By adopting the high-side driving circuit, the abnormity occurring in the running process of the circuit can be processed in time, so that the safety of equipment is ensured, and the service life is prolonged.
Description
Technical Field
The application relates to the technical field of electronic appliances, in particular to a high-side driving circuit and a controller with the same.
Background
In modern society, automobiles become an indispensable part, and great convenience is brought to daily travel and work and life of people. Various electronic devices are installed in a vehicle to implement different functions.
At present, in the related technology, whether the electronic equipment has faults or not is diagnosed through different states of a control end of a single chip microcomputer, but the mode cannot timely process the abnormity generated when the electronic equipment operates, and potential safety hazards are caused.
SUMMERY OF THE UTILITY MODEL
Accordingly, it is desirable to provide a high-side driving circuit and a controller having the same, which can handle an abnormal state of the circuit in time to ensure safety, in view of the above-mentioned drawbacks or disadvantages.
In a first aspect, an embodiment of the present application provides a high-side driving circuit, where the circuit includes a sampling module, a switching module, and an overcurrent protection module;
the first end of the sampling module is connected with the anode of a power supply, the second end of the sampling module is connected with the first end of the switch module and the first end of the overcurrent protection module, the second end of the switch module is connected with a load, and the second end of the overcurrent protection module is connected with the third end of the switch module;
the sampling module is configured to convert the output current of the power supply into a first voltage signal and output the first voltage signal to the overcurrent protection module;
the overcurrent protection module is configured to convert the first voltage signal into a second voltage signal and output the second voltage signal to the switch module when the received first voltage signal is greater than a preset voltage threshold;
the switch module is configured to switch to an off state when receiving the second voltage signal output by the over-current protection module.
Optionally, in some embodiments of the present application, the overcurrent protection module includes a first level shift unit, a second level shift unit, and a third level shift unit;
the second end of the sampling module is connected with the first level conversion unit, the first level conversion unit is connected with the second level conversion unit, the second level conversion unit is connected with the third level conversion unit, and the third level conversion unit is connected with the third end of the switch module;
the first level shift unit is configured to convert the first voltage signal into a third voltage signal, the second level shift unit is configured to convert the third voltage signal into a fourth voltage signal, and the third level shift unit is configured to convert the fourth voltage signal into the second voltage signal.
Optionally, in some embodiments of the present application, a first terminal of the first level shifting unit is connected to the positive electrode of the power supply, a second terminal of the first level shifting unit is connected to a first terminal of the second level shifting unit, a third terminal of the first level shifting unit is connected to a second terminal of the second level shifting unit, and a fourth terminal of the first level shifting unit is grounded;
a third end of the second level conversion unit is connected with a second end of the sampling module, a fourth end of the second level conversion unit is connected with a first end of the third level conversion unit, and a fifth end of the second level conversion unit is grounded;
and the second end of the third level conversion unit is connected with the anode of the power supply, and the third end of the third level conversion unit is connected with the third end of the switch module.
Optionally, in some embodiments of the present application, the first level shift unit includes a first transistor, a first resistor, and a second resistor, the second level shift unit includes a second transistor, a third resistor, a fourth resistor, and a fifth resistor, and the third level shift unit includes a third transistor;
the emitter of the first triode is connected with the anode of the power supply, the base of the first triode is connected with the first end of the third resistor and the first end of the fourth resistor, a second end of the third resistor is connected with a second end of the sampling module, a second end of the fourth resistor is connected with a collector of the second triode and a first end of the fifth resistor, the collector of the first triode is connected with the first end of the first resistor and the first end of the second resistor, the second end of the second resistor is grounded, the second end of the first resistor is connected with the base electrode of the second triode, the emitter of the second triode is grounded, the second end of the fifth resistor is connected with the base of the third triode, and the emitter of the third triode is connected with the anode of the power supply, and the collector of the third triode is connected with the third end of the switch module.
Optionally, in some embodiments of the present application, the overcurrent protection module further includes a voltage limiting unit;
the first end of the voltage limiting unit is connected with the fifth end of the first level conversion unit, the second end of the voltage limiting unit is connected with the first end of the controller, the third end of the voltage limiting unit is grounded, the fourth end of the voltage limiting unit is connected with the output end of the power management chip, and the fifth end of the voltage limiting unit is grounded;
the voltage limiting unit is configured to detect a change of the first voltage signal and divide the voltage to protect a port of the controller.
Optionally, in some embodiments of the present application, the voltage limiting unit includes a sixth resistor, a seventh resistor, and an eighth resistor connected in series with each other, and a first diode and a second diode connected in series with each other;
the first end of the sixth resistor is connected with the fifth end of the first level conversion unit, the first end of the eighth resistor is connected with the first end of the controller, the second end of the eighth resistor is grounded, the second end of the sixth resistor is connected with the anode of the first diode, the cathode of the first diode is connected with the output end of the power management chip, and the anode of the second diode is grounded.
Optionally, in some embodiments of the present application, the sampling module includes a sampling unit, a first end of the sampling unit is connected to the positive electrode of the power supply, and a second end of the sampling unit is connected to the first end of the switch module and the first end of the over-current protection module.
Optionally, in some embodiments of the present application, the sampling module further comprises a diagnostic unit;
the first end of the diagnosis unit is connected with the first end of the sampling unit, the second end of the diagnosis unit is connected with the second end of the switch module, the third end of the diagnosis unit is grounded, and the fourth end of the diagnosis unit is connected with the second end of the controller;
the diagnostic unit is configured to output a voltage signal to cause the controller to identify a circuit operating state from the voltage signal.
Optionally, in some embodiments of the present application, the diagnosis unit includes a ninth resistor, a tenth resistor and an eleventh resistor connected in series with each other, a first end of the ninth resistor is connected to the first end of the sampling unit, a second end of the ninth resistor is connected to the second end of the switch module, a first end of the eleventh resistor is connected to the second end of the controller, and a second end of the eleventh resistor is grounded.
Optionally, in some embodiments of the present application, the diagnostic unit further includes a twelfth resistor and a first capacitor, the twelfth resistor is disposed between the first end of the eleventh resistor and the second end of the controller, and the first capacitor is disposed between the second end of the eleventh resistor and the second end of the controller.
Optionally, in some embodiments of the present application, the diagnostic unit further includes a third diode and a second capacitor, a cathode of the third diode is connected to the second end of the ninth resistor, an anode of the third diode is grounded, a first end of the second capacitor is connected to the second end of the ninth resistor, and a second end of the second capacitor is grounded.
Optionally, in some embodiments of the present application, the switch module includes a control unit and a driving unit;
the first end of the control unit is connected with the third end of the controller, the second end of the control unit is grounded, the third end of the control unit is connected with the first end of the driving unit, the second end of the driving unit is connected with the second end of the overcurrent protection module, the third end of the driving unit is connected with the positive electrode of the power supply, the fourth end of the driving unit is connected with the second end of the sampling module, and the fifth end of the driving unit is connected with the load;
the control unit is configured to receive a control signal sent by the controller, and the driving unit is configured to switch on and off according to the control signal so as to supply power to the load.
Optionally, in some embodiments of the present application, the control unit includes a fourth transistor, and the driving unit includes a field effect transistor, a thirteenth resistor, and a fourteenth resistor;
the base electrode of the fourth triode is connected with the third end of the controller, the emitting electrode of the fourth triode is grounded, the collector electrode of the fourth triode is connected with the first end of the thirteenth resistor, the second end of the thirteenth resistor is connected with the second end of the overcurrent protection module and the first end of the fourteenth resistor, the second end of the fourteenth resistor is connected with the positive electrode of the power supply, the source electrode of the field-effect tube is connected with the second end of the sampling module, the drain electrode of the field-effect tube is connected with the load, and the grid electrode of the field-effect tube is connected with the second end of the thirteenth resistor.
Optionally, in some embodiments of the present application, the driving unit further includes a fourth diode, an anode of the fourth diode is connected to the gate of the field effect transistor, and a cathode of the fourth diode is connected to the anode of the power supply.
Optionally, in some embodiments of the present application, in a case that the overcurrent protection module includes a first level shift unit, a second level shift unit, and a third level shift unit, a fifth terminal of the second level shift unit is grounded through the fourth transistor, so that when the fourth transistor is in an off state, the first level shift unit, the second level shift unit, and the third level shift unit are all turned off.
In a second aspect, an embodiment of the present application provides a controller, where the controller includes the high-side driving circuit described in any one of the first aspects.
According to the technical scheme, the embodiment of the application has the following advantages:
the high-side driving circuit and the controller with the high-side driving circuit judge whether the voltage signal is larger than a preset voltage threshold value or not through the overcurrent protection module in the high-side driving circuit, and can output the converted voltage signal to the switch module in time when the voltage signal is larger than the voltage threshold value, so that the switch module can be disconnected from a load, equipment is protected safely, and the service life is prolonged.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 is a block diagram of an application of a high-side driving circuit according to an embodiment of the present disclosure;
fig. 2 is a block diagram of a high-side driving circuit according to an embodiment of the present disclosure;
fig. 3 is a block diagram of another high-side driving circuit according to an embodiment of the present disclosure;
fig. 4 is a block diagram of a structure of another high-side driving circuit provided in an embodiment of the present application;
fig. 5 is a schematic structural diagram of a high-side driving circuit according to an embodiment of the present disclosure;
fig. 6 is a schematic current flow diagram of a high-side driving circuit according to an embodiment of the present disclosure;
fig. 7 is a block diagram of a controller according to an embodiment of the present disclosure.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the present application and in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described are capable of operation in sequences other than those illustrated or otherwise described herein.
Moreover, the terms "comprises," "comprising," and any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or modules is not necessarily limited to those steps or modules explicitly listed, but may include other steps or modules not expressly listed or inherent to such process, method, article, or apparatus.
For ease of understanding, reference will now be made to the application block diagram shown in fig. 1. For example, the high-side driving circuit provided by the embodiment of the application can be applied to a vehicle-mounted controller requiring high-side output and a circuit driving a large-current load. Illustratively, the current of the power supply reaches the load through the high-side driving circuit of the embodiment of the application, and then returns to the power supply through the low-side driving circuit to form a loop. It should be noted that "-" in fig. 1 denotes a connection line of a power supply terminal, "-" denotes a connection line of a ground terminal, and "-" denotes a signal interaction line of a controller and a high-side driving circuit or a controller and a low-side driving circuit. In practical use, for example, the controller is a Microcontroller (MCU), the Microcontroller sends a control signal to the high-side driving circuit, and then the high-side driving circuit feeds back voltage information and protection information to the Microcontroller, so that the Microcontroller can directly perform fault identification according to the voltage information, such as open circuit at the output end, short circuit to ground or short circuit to a power supply, and perform circuit latch control according to the protection information, and therefore the high-side driving circuit in the embodiment of the present application can be independent of the diagnostic control of the Microcontroller, handle abnormal states of the circuit in time, and ensure safety.
Please refer to fig. 2, which is a block diagram of a high-side driving circuit according to an embodiment of the present disclosure, in which the high-side driving circuit 100 includes a sampling module 101, a switching module 102, and an overcurrent protection module 103, a first end of the sampling module 101 is connected to an anode of a power supply, a second end of the sampling module 101 is connected to a first end of the switching module 102 and a first end of the overcurrent protection module 103, a second end of the switching module 102 is connected to a load, and a second end of the overcurrent protection module 103 is connected to a third end of the switching module 102.
It should be noted that, in this embodiment of the application, first, the sampling module 101 converts an output current of the power supply into a first voltage signal, and then outputs the first voltage signal to the overcurrent protection module 103, and then, the overcurrent protection module 103 determines the size of the received first voltage signal and a preset voltage threshold, and when the first voltage signal is greater than the preset voltage threshold, it indicates that an abnormal condition exists in the circuit, the first voltage signal needs to be converted into a second voltage signal, and the second voltage signal is timely output to the switch module 102, and then the switch module 102 is rapidly switched to the off state after receiving the second voltage signal output by the overcurrent protection module 103, so as to ensure the safety of the device.
Optionally, as shown in fig. 3, in some embodiments of the present application, the over-current protection module 103 may include a first level shift unit 1031, a second level shift unit 1032, and a third level shift unit 1033. The second terminal of the sampling module 101 is connected to the first level conversion unit 1031, the first level conversion unit 1031 is connected to the second level conversion unit 1032, the second level conversion unit 1032 is connected to the third level conversion unit 1033, the third level conversion unit 1033 is connected to the third terminal of the switch module 102, the first level conversion unit 1031 is configured to convert the first voltage signal into a third voltage signal, the second level conversion unit 1032 is configured to convert the third voltage signal into a fourth voltage signal, and the third level conversion unit 1033 is configured to convert the fourth voltage signal into the second voltage signal. For example, a first terminal of the first level shift unit 1031 is connected to the positive electrode of the power supply, a second terminal of the first level shift unit 1031 is connected to a first terminal of the second level shift unit 1032, a third terminal of the first level shift unit 1031 is connected to a second terminal of the second level shift unit 1032, and a fourth terminal of the first level shift unit 1031 is grounded; a third terminal of the second level shift unit 1032 is connected to the second terminal of the sampling module 101, a fourth terminal of the second level shift unit 1032 is connected to the first terminal of the third level shift unit 1033, and a fifth terminal of the second level shift unit 1032 is grounded; a second terminal of the third level shifter 1033 is connected to the positive terminal of the power supply, and a third terminal of the third level shifter 1033 is connected to the third terminal of the switch module 102.
Optionally, as shown in fig. 4, in some embodiments of the present application, the over-current protection module 103 may further include a voltage limiting unit 1034, where the voltage limiting unit 1034 is configured to detect a change of the first voltage signal and divide the voltage to protect a port of the controller. A first end of the voltage limiting unit 1034 is connected to the fifth end of the first level converting unit 1031, a second end of the voltage limiting unit 1034 is connected to the first end of the controller, a third end of the voltage limiting unit 1034 is grounded, a fourth end of the voltage limiting unit 1034 is connected to the output end of the power management chip, and a fifth end of the voltage limiting unit 1034 is grounded.
Optionally, in some embodiments of the present application, the sampling module 101 may include a sampling unit, wherein a first end of the sampling unit is connected to a positive electrode of the power supply, and a second end of the sampling unit is connected to a first end of the switch module 102 and a first end of the over-current protection module 103.
Optionally, in some embodiments of the present application, the sampling module 101 may further include a diagnosis unit configured to output a voltage signal, so that the controller identifies a circuit operation state, such as an open circuit at an output terminal, a short circuit to ground, a short circuit to a power supply, or the like, according to the voltage signal. The first end of the diagnosis unit is connected with the first end of the sampling unit, the second end of the diagnosis unit is connected with the second end of the switch module 102, the third end of the diagnosis unit is grounded, and the fourth end of the diagnosis unit is connected with the second end of the controller.
Optionally, in some embodiments of the present application, the switch module 102 may include a control unit configured to receive a control signal sent by the controller, and a driving unit configured to perform switching according to the control signal to supply power to the load. The first end of the control unit is connected with the third end of the controller, the second end of the control unit is grounded, the third end of the control unit is connected with the first end of the driving unit, the second end of the driving unit is connected with the second end of the overcurrent protection module 103, the third end of the driving unit is connected with the positive pole of the power supply, the fourth end of the driving unit is connected with the second end of the sampling module 101, and the fifth end of the driving unit is connected with the load.
For example, referring to fig. 5, a detailed circuit structure of each constituent module or unit in the high-side driving circuit 100 will be described in detail.
For example, the first level shift unit 1031 in the overcurrent protection module 103 may include a first transistor Q1, a first resistor R1, and a second resistor R2, where the first transistor Q1 may include, but is not limited to, a PNP transistor, and the first resistor R1 is used for current limiting; the second level shifter unit 1032 may include a second transistor Q2, a third resistor R3, a fourth resistor R4, and a fifth resistor R5, the second transistor Q2 may include, but is not limited to, an NPN transistor, and the fifth resistor R5 is used for current limiting; the third level shifter unit 1033 may include a third transistor Q3. In practical use, the preset voltage threshold may be the be voltage V of the first transistor Q1beQ1. An emitter e of the first triode Q1 is connected to a positive electrode of a power supply, for example, the voltage of the power supply is 12V, a base b of the first triode Q1 is connected to a first end of the third resistor R3 and a first end of the fourth resistor R4, a second end of the third resistor R3 is connected to a second end of the sampling module 101, a second end of the fourth resistor R4 is connected to a collector c of the second triode Q2 and a first end of the fifth resistor R5, a collector c of the first triode Q1 is connected to a first end of the first resistor R1One end of the second resistor R2 is connected to the first end of the second resistor R2, the second end of the second resistor R2 is grounded, the second end of the first resistor R1 is connected to the base b of the second transistor Q2, the emitter e of the second transistor Q2 is grounded, the second end of the fifth resistor R5 is connected to the base b of the third transistor Q3, the emitter e of the third transistor Q3 is connected to the positive electrode of the power supply, and the collector c of the third transistor Q3 is connected to the third end of the switching module 102.
For another example, the voltage limiting unit 1034 may include a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8 connected in series with each other, and a first diode D1 and a second diode D2 connected in series with each other. A first end of the sixth resistor R6 is connected to the fifth end of the first level shift unit 1031, a first end of the eighth resistor R8 is connected to the first end of the controller, a second end of the eighth resistor R8 is grounded, a second end of the sixth resistor R6 is connected to the anode of the first diode D1, a cathode of the first diode D1 is connected to an output end of the power management chip, for example, the voltage at the output end of the power management chip is 5V, and the anode of the second diode D2 is grounded. For example, the first terminal of the controller is a digital input/output interface, and the high-low state of the first terminal of the eighth resistor R8 is related to the state of the control signal, i.e., the high-low state of the first terminal of the eighth resistor R8 is read when the control signal is at a high level.
For another example, the sampling unit in the sampling module 101 may include a resistor R0, a first terminal of the resistor R0 is connected to the positive terminal of the power supply, and a second terminal of the resistor R0 is connected to the first terminal of the switch module 102 and the first terminal of the over-current protection module 103.
For another example, the diagnostic unit in the sampling module 101 may include a ninth resistor R9, a tenth resistor R10, and an eleventh resistor R11 connected in series, where a first end of the ninth resistor R9 is connected to the first end of the sampling unit, a second end of the ninth resistor R9 is connected to the second end of the switch module 102, a first end of the eleventh resistor R11 is connected to the second end of the controller, and a second end of the eleventh resistor R11 is grounded. For example, the second end of the controller is an analog input/output interface.
Optionally, the diagnostic unit in some embodiments of the present application may further include a twelfth resistor R12 and a first capacitor C1, which advantageously can function as a filter, thereby improving the diagnostic accuracy. The twelfth resistor R12 is disposed between the first end of the eleventh resistor R11 and the second end of the controller, and the first capacitor C1 is disposed between the second end of the eleventh resistor R11 and the second end of the controller.
Optionally, the diagnostic unit in some embodiments of the present application may further include a third diode D3 and a second capacitor C2, thereby being capable of protecting the circuit port. The cathode of the third diode D3 is connected to the second terminal of the ninth resistor R9, the anode of the third diode D3 is grounded, the first terminal of the second capacitor C2 is connected to the second terminal of the ninth resistor R9, and the second terminal of the second capacitor C2 is grounded.
As another example, the control unit in the switch module 102 may include a fourth transistor Q4, the fourth transistor Q4 may include any one of a band-stop transistor and a non-blocking transistor, so as to meet diversified usage requirements, and the driving unit may include a field effect transistor Q5, a thirteenth resistor R13 and a fourteenth resistor R14, the field effect transistor Q5 may include, but is not limited to, a P-channel power MOS transistor, which selects a current class according to actual load requirements. It should be noted that the band-stop triode refers to a triode with a resistor integrated therein, while the non-resistance triode refers to a triode without a resistor, and a resistor can be separately arranged on the base b of the triode to realize the same function as the band-stop triode.
A base b of the fourth triode Q4 is connected to the third end of the controller, an emitter e of the fourth triode Q4 is grounded, a collector c of the fourth triode Q4 is connected to the first end of the thirteenth resistor R13, the second end of the thirteenth resistor R13 is connected to the second end of the overcurrent protection module 103 and the first end of the fourteenth resistor R14, the second end of the fourteenth resistor R14 is connected to the positive electrode of the power supply, the source s of the field-effect transistor Q5 is connected to the second end of the sampling module 101, the drain d of the field-effect transistor Q5 is connected to the load, and the gate g of the field-effect transistor Q5 is connected to the second end of the thirteenth resistor R13.
Optionally, in some embodiments of the present application, the driving unit may further include a fourth diode D4, and the fourth diode D4 may include, but is not limited to, a clamping diode, which is advantageous in that the safety of the fet Q5 can be protected from damage. The anode of the fourth diode D5 is connected to the gate g of the fet Q5, and the cathode of the fourth diode D4 is connected to the anode of the power supply.
Optionally, in the case that the overcurrent protection module 103 includes the first level conversion unit 1031, the second level conversion unit 1032 and the third level conversion unit 1033, the fifth terminal of the second level conversion unit 1032 may also be grounded through the fourth transistor Q4, which is beneficial to setting that when the fourth transistor Q4 is in an off state, the first level conversion unit 1031, the second level conversion unit 1032 and the third level conversion unit 1033 are all turned off. Further, in the embodiment of the present application, a fifth diode D5 may be disposed between the fifth terminal of the second level shifter unit 1032 and the fourth transistor Q4, and the fifth diode D5 may protect the second transistor Q2 from reverse breakdown.
The operation principle of the high-side driving circuit 100 according to the embodiment of the present application will be described with reference to fig. 6. In the first operation phase, the first transistor Q1, the second transistor Q2, the third transistor Q3, the fourth transistor Q4 and the fet Q5 are all in an off state, that is, the control signal output from the third terminal of the controller is at a low level, and at this time, the current flows in the direction shown in fig. 6, that is, the power supply → the ninth resistor R9 → the tenth resistor R10 → the eleventh resistor R11, and in the direction shown in fig. 6, that is, the power supply → the ninth resistor R9 → the load.
In the second operation phase, when the control signal outputted from the third terminal of the controller is at a high level, the fourth transistor Q4 is in a conducting state, and the current flows to the third node shown in fig. 6, i.e., the power supply → the fourteenth resistor R14 → the thirteenth resistor R13 → the fourth transistor Q4. Further, the gate voltage of the fet Q5 is pulled low by the voltage division of the thirteenth resistor R13 and the fourteenth resistor R14, the fet Q5 is turned on and supplies power to the load, so that the load can start to operate, and the current flows to the flow direction of the current shown in fig. 6 (i.e., power supply → resistor R0 → fet Q5 → load).
In the third operation phase, when the current at the resistor R0 is too large, the overcurrent protection is implemented, and at this time, since the voltage between the base b and the emitter e of the first transistor Q1 becomes large, the first transistor Q1 is turned on, and the current flows to the fifth direction as shown in fig. 6, i.e., the power supply → the first transistor Q1 → the second resistor R2. Further, as the voltage at the base of the second transistor Q2 rises, the second transistor Q2 is turned on, and the current flows to the sixth direction as shown in fig. 6, i.e., the power → the resistor R0 → the third resistor R3 → the fourth resistor R4 → the second transistor Q2 → the fifth diode D5 → the fourth transistor Q4. Further, since the base voltage of the third transistor Q3 is pulled low, the third transistor Q3 is turned on, and the current flows to direction c shown in fig. 6, i.e., power → the third transistor Q3 → the thirteenth resistor R13 → the fourth transistor Q4. Further, as the gate voltage of the field effect transistor Q5 is increased, the field effect transistor Q5 can be turned off in time, so as to protect the safety of the circuit.
In addition, it should be noted that if the voltage at the second end of the controller is the divided voltage corresponding to the tenth resistor R10 and the eleventh resistor R11 on the eleventh resistor R11, it indicates that the second end of the ninth resistor R9 is shorted to the power supply, and is abnormal; if the voltage at the second end of the controller is zero, it indicates that the second end of the ninth resistor R9 has an abnormal fault short-circuited to ground; if the voltage of the second end of the controller is the divided voltage corresponding to the eleventh resistor R11 of the power supply on the ninth resistor R9, the tenth resistor R10 and the eleventh resistor R11, it indicates that the second end of the ninth resistor R9 is floating; if the voltage at the second end of the switch module 102 is the power source, the ninth resistor R9 and the load resistor RLThe divided voltage corresponding to the ninth resistor R9 is obtained from/v (the tenth resistor R10+ the eleventh resistor R11), the symbol "/" indicates that the parallel connection is performed, and the voltage at the second end of the controller is the divided voltage of the tenth resistor R10 and the eleventh resistor R11, which indicates that the second end of the ninth resistor R9 is connected to the load, but the FET Q5 is not conductive.
On the other hand, the embodiment of the application also provides a controller. As shown in fig. 7, the controller 200 may include, but is not limited to, the high-side driving circuit 100 in the corresponding embodiments of fig. 2 to 6.
The embodiment of the application provides a high-side driving circuit and a controller with the same, whether a voltage signal is greater than a preset voltage threshold value or not is judged through an overcurrent protection module in the high-side driving circuit, and when the voltage signal is greater than the voltage threshold value, the converted voltage signal can be timely output to a switch module, so that the switch module can be disconnected from a load, the safety of equipment is protected, and the service life is prolonged.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application.
Claims (16)
1. A high-side driving circuit is characterized by comprising a sampling module, a switch module and an overcurrent protection module;
the first end of the sampling module is connected with the anode of a power supply, the second end of the sampling module is connected with the first end of the switch module and the first end of the overcurrent protection module, the second end of the switch module is connected with a load, and the second end of the overcurrent protection module is connected with the third end of the switch module;
the sampling module is configured to convert the output current of the power supply into a first voltage signal and output the first voltage signal to the overcurrent protection module;
the overcurrent protection module is configured to convert the first voltage signal into a second voltage signal and output the second voltage signal to the switch module when the received first voltage signal is greater than a preset voltage threshold;
the switch module is configured to switch to an off state when receiving the second voltage signal output by the over-current protection module.
2. The high-side driving circuit according to claim 1, wherein the over-current protection module comprises a first level shifting unit, a second level shifting unit and a third level shifting unit;
the second end of the sampling module is connected with the first level conversion unit, the first level conversion unit is connected with the second level conversion unit, the second level conversion unit is connected with the third level conversion unit, and the third level conversion unit is connected with the third end of the switch module;
the first level shift unit is configured to convert the first voltage signal into a third voltage signal, the second level shift unit is configured to convert the third voltage signal into a fourth voltage signal, and the third level shift unit is configured to convert the fourth voltage signal into the second voltage signal.
3. The high-side driving circuit according to claim 2, wherein a first terminal of the first level shifter is connected to the positive electrode of the power supply, a second terminal of the first level shifter is connected to a first terminal of the second level shifter, a third terminal of the first level shifter is connected to a second terminal of the second level shifter, and a fourth terminal of the first level shifter is grounded;
a third end of the second level conversion unit is connected with a second end of the sampling module, a fourth end of the second level conversion unit is connected with a first end of the third level conversion unit, and a fifth end of the second level conversion unit is grounded;
and the second end of the third level conversion unit is connected with the anode of the power supply, and the third end of the third level conversion unit is connected with the third end of the switch module.
4. The high-side driving circuit according to claim 3, wherein the first level shifter unit comprises a first transistor, a first resistor and a second resistor, the second level shifter unit comprises a second transistor, a third resistor, a fourth resistor and a fifth resistor, and the third level shifter unit comprises a third transistor;
the emitter of the first triode is connected with the anode of the power supply, the base of the first triode is connected with the first end of the third resistor and the first end of the fourth resistor, a second end of the third resistor is connected with a second end of the sampling module, a second end of the fourth resistor is connected with a collector of the second triode and a first end of the fifth resistor, the collector of the first triode is connected with the first end of the first resistor and the first end of the second resistor, the second end of the second resistor is grounded, the second end of the first resistor is connected with the base electrode of the second triode, the emitter of the second triode is grounded, the second end of the fifth resistor is connected with the base of the third triode, and the emitter of the third triode is connected with the anode of the power supply, and the collector of the third triode is connected with the third end of the switch module.
5. The high-side driving circuit according to claim 2, wherein the over-current protection module further comprises a voltage limiting unit;
the first end of the voltage limiting unit is connected with the fifth end of the first level conversion unit, the second end of the voltage limiting unit is connected with the first end of the controller, the third end of the voltage limiting unit is grounded, the fourth end of the voltage limiting unit is connected with the output end of the power management chip, and the fifth end of the voltage limiting unit is grounded;
the voltage limiting unit is configured to detect a change of the first voltage signal and divide the voltage to protect a port of the controller.
6. The high-side driving circuit according to claim 5, wherein the voltage limiting unit comprises a sixth resistor, a seventh resistor and an eighth resistor connected in series with each other, and a first diode and a second diode connected in series with each other;
the first end of the sixth resistor is connected with the fifth end of the first level conversion unit, the first end of the eighth resistor is connected with the first end of the controller, the second end of the eighth resistor is grounded, the second end of the sixth resistor is connected with the anode of the first diode, the cathode of the first diode is connected with the output end of the power management chip, and the anode of the second diode is grounded.
7. The high-side driving circuit according to claim 1, wherein the sampling module comprises a sampling unit, a first end of the sampling unit is connected to the positive electrode of the power supply, and a second end of the sampling unit is connected to the first end of the switch module and the first end of the over-current protection module.
8. The high-side drive circuit of claim 7, wherein the sampling module further comprises a diagnostic unit;
the first end of the diagnosis unit is connected with the first end of the sampling unit, the second end of the diagnosis unit is connected with the second end of the switch module, the third end of the diagnosis unit is grounded, and the fourth end of the diagnosis unit is connected with the second end of the controller;
the diagnostic unit is configured to output a voltage signal to cause the controller to identify a circuit operating state from the voltage signal.
9. The high-side driving circuit according to claim 8, wherein the diagnosis unit comprises a ninth resistor, a tenth resistor and an eleventh resistor connected in series, a first end of the ninth resistor is connected to the first end of the sampling unit, a second end of the ninth resistor is connected to the second end of the switch module, a first end of the eleventh resistor is connected to the second end of the controller, and a second end of the eleventh resistor is grounded.
10. The high-side driver circuit according to claim 9, wherein the diagnostic unit further comprises a twelfth resistor and a first capacitor, the twelfth resistor is disposed between a first end of the eleventh resistor and a second end of the controller, and the first capacitor is disposed between a second end of the eleventh resistor and a second end of the controller.
11. The high-side driver circuit according to claim 10, wherein the diagnostic unit further comprises a third diode and a second capacitor, a cathode of the third diode is connected to the second terminal of the ninth resistor, an anode of the third diode is grounded, a first terminal of the second capacitor is connected to the second terminal of the ninth resistor, and a second terminal of the second capacitor is grounded.
12. The high side drive circuit according to any of claims 1 to 11, wherein the switch module comprises a control unit and a drive unit;
the first end of the control unit is connected with the third end of the controller, the second end of the control unit is grounded, the third end of the control unit is connected with the first end of the driving unit, the second end of the driving unit is connected with the second end of the overcurrent protection module, the third end of the driving unit is connected with the positive electrode of the power supply, the fourth end of the driving unit is connected with the second end of the sampling module, and the fifth end of the driving unit is connected with the load;
the control unit is configured to receive a control signal sent by the controller, and the driving unit is configured to switch on and off according to the control signal so as to supply power to the load.
13. The high-side driving circuit according to claim 12, wherein the control unit comprises a fourth triode, and the driving unit comprises a field effect transistor, a thirteenth resistor and a fourteenth resistor;
the base electrode of the fourth triode is connected with the third end of the controller, the emitting electrode of the fourth triode is grounded, the collector electrode of the fourth triode is connected with the first end of the thirteenth resistor, the second end of the thirteenth resistor is connected with the second end of the overcurrent protection module and the first end of the fourteenth resistor, the second end of the fourteenth resistor is connected with the positive electrode of the power supply, the source electrode of the field-effect tube is connected with the second end of the sampling module, the drain electrode of the field-effect tube is connected with the load, and the grid electrode of the field-effect tube is connected with the second end of the thirteenth resistor.
14. The high-side driver circuit according to claim 13, wherein the driver unit further comprises a fourth diode, an anode of the fourth diode is connected to the gate of the fet, and a cathode of the fourth diode is connected to the anode of the power supply.
15. The high-side driving circuit according to claim 13, wherein in a case that the over-current protection module includes a first level shifting unit, a second level shifting unit and a third level shifting unit, a fifth terminal of the second level shifting unit is grounded through the fourth transistor, so that when the fourth transistor is in an off state, the first level shifting unit, the second level shifting unit and the third level shifting unit are all turned off.
16. A controller, characterized in that the controller comprises a high side driver circuit according to any of claims 1 to 15.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202123348824.2U CN216720891U (en) | 2021-12-28 | 2021-12-28 | High-side driving circuit and controller with same |
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| CN202123348824.2U CN216720891U (en) | 2021-12-28 | 2021-12-28 | High-side driving circuit and controller with same |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116054867A (en) * | 2023-02-02 | 2023-05-02 | 上海拿森汽车电子有限公司 | CAN transceiver circuit, communication device and vehicle |
| WO2023138161A1 (en) * | 2022-01-24 | 2023-07-27 | 比亚迪股份有限公司 | Low-side driving circuit, electronic device having same, and vehicle |
| CN117420815A (en) * | 2023-11-07 | 2024-01-19 | 一汽解放汽车有限公司 | Self-diagnosis drive output circuit, vehicle, and abnormal state determination method |
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2021
- 2021-12-28 CN CN202123348824.2U patent/CN216720891U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023138161A1 (en) * | 2022-01-24 | 2023-07-27 | 比亚迪股份有限公司 | Low-side driving circuit, electronic device having same, and vehicle |
| CN116054867A (en) * | 2023-02-02 | 2023-05-02 | 上海拿森汽车电子有限公司 | CAN transceiver circuit, communication device and vehicle |
| CN117420815A (en) * | 2023-11-07 | 2024-01-19 | 一汽解放汽车有限公司 | Self-diagnosis drive output circuit, vehicle, and abnormal state determination method |
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