High-low side driving output circuit

Abstract

The utility model discloses a kind of high-low side drive output circuit, including MCU module and respectively communicating high-side drive module and low-side drive module of MCU module, MCU module has the first output pin of first drive signal output to high-side drive module, and the second output pin of second drive signal output to low-side drive module, OUT output module is connected between high-side drive module and low-side drive module, power supply is externally connected to high-side drive module, the one end of low-side drive module relative to OUT output module is grounded, high-side drive enable module is further provided between high-side drive module and MCU module, high-side drive enable module is connected with the third output pin of MCU module, and according to the third drive signal output received by the third output pin, high-side drive module is activated or closed. Compared with the prior art, the utility model can constitute double insurance for the circuit itself, and increase safety redundancy.

Description

Technical Field

[0001] This utility model relates to a high-side and low-side drive output circuit, belonging to the field of circuit technology. Background Technology

[0002] High-side and low-side drive output circuits are core control components in fields such as industrial automation and new energy vehicles. They are used to safely turn external loads (such as motors and actuators) on or off according to signals from the control unit.

[0003] Currently, the topology of such circuits is relatively fixed and their functions are singular, mostly focusing only on implementing basic drive switching functions. In practical industrial applications, this single connection method and control approach lacks necessary redundancy design. In particular, most current circuits heavily rely on direct commands from the main control unit and lack an independent, redundant safety control mechanism (such as redundant control paths managed by an independent monitoring unit) to cope with potential failures of the main control unit.

[0004] This limits the overall reliability of the circuit and makes it unable to provide sufficient fault response capabilities in complex or high-safety-requirement application scenarios, thus posing a hidden danger to the safe and stable operation of production equipment.

[0005] In view of this, it is indeed necessary to improve the existing high-side and low-side drive output circuits to solve the above problems. Utility Model Content

[0006] To solve the above-mentioned technical problems, this utility model provides a high-low side drive output circuit, which can provide double protection for the circuit itself and increase safety redundancy.

[0007] The technical solution of this utility model is:

[0008] A high-side and low-side drive output circuit includes an MCU module and a high-side drive module and a low-side drive module respectively connected to the MCU module. The MCU module has a first output pin that outputs a first drive signal to the high-side drive module and a second output pin that outputs a second drive signal to the low-side drive module. An OUT output module is provided between the high-side drive module and the low-side drive module. The high-side drive module is externally connected to a power supply. One end of the low-side drive module relative to the OUT output module is grounded. A high-side drive enable module is also provided between the high-side drive module and the MCU module. The high-side drive enable module is connected to a third output pin of the MCU module and activates or deactivates the high-side drive module according to the third drive signal received from the third output pin.

[0009] As a further improvement of this utility model, the first output pin and the third output pin are independent of each other and are configured to output the same or different drive signals.

[0010] As a further improvement of this utility model, a first monitoring module is provided between the power supply and the high-side drive module. The first monitoring module is connected to the voltage input pin of the MCU module. The MCU module is configured to adjust the first drive signal and / or the third drive signal output to the high-side drive module according to the voltage received by the voltage input pin, so as to activate or deactivate the high-side drive module.

[0011] As a further improvement of this utility model, a high-side constant current module is also provided between the power supply and the high-side drive module, and the first monitoring module is located between the high-side constant current module and the high-side drive module.

[0012] As a further improvement of this utility model, both the first output pin and the third output pin are configured to output a high-level signal or a low-level signal. When the first output pin and / or the third output pin outputs a low-level signal, the high-side driving module is turned off.

[0013] As a further improvement of this utility model, the high-side driving module is used to output a high-level voltage to the OUT output module, the low-side driving module is used to output a low-level voltage to the OUT output module, and the OUT output module is used to output the voltage generated by the coordinated control of the high-side driving module and the low-side driving module.

[0014] As a further improvement of this utility model, a second monitoring module is provided between the OUT output module and the MCU module. The second monitoring module is connected to the voltage feedback pin of the MCU module. The MCU module is configured to adjust the first driving signal, the second driving signal and the third driving signal according to the voltage received by the voltage feedback pin, so as to activate or deactivate the high-side driving module and the low-side driving module.

[0015] As a further improvement of this utility model, the first drive signal configuration can activate or deactivate the output of the OUT output module.

[0016] As a further improvement of this utility model, a low-side constant current module is connected to one end of the low-side driving module relative to the high-side driving module, and the other end of the low-side constant current module relative to the low-side driving module is grounded.

[0017] As a further improvement of this utility model, the MCU module is configured to activate the high-side driving module and the low-side driving module sequentially through the first driving signal, the second driving signal and the third driving signal.

[0018] The beneficial technical effects of this utility model are as follows: The high-side drive output circuit of this utility model sets a high-side drive enable module between the high-side drive module and the MCU module, and the high-side drive enable module is connected to the third output pin of the MCU module. The high-side drive module is activated or deactivated according to the third drive signal output by the received third output pin. Through the relatively independent first output pin and third output pin, the high-side drive module can be activated or deactivated by the independently output first drive signal and / or third drive signal, which constitutes double protection for the high-side drive module and increases safety redundancy. Attached Figure Description

[0019] Figure 1 This is a structural block diagram of the high and low side drive output circuit according to a preferred embodiment of the present utility model.

[0020] Figure 2 yes Figure 1 Circuit diagram of the high-low side drive output circuit.

[0021] Figure 3 yes Figure 1 The normal waveform of the mid-high-low side drive output circuit with diagnostic output.

[0022] Figure 4 yes Figure 1 The output circuit of the high, medium and low side drive circuit outputs a 24V waveform that is shorted.

[0023] Figure 5 yes Figure 1 The output waveform of the high, medium and low side drive circuit is shorted to GND. Detailed Implementation

[0024] In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0025] Please see Figures 1 to 5 As shown, this utility model discloses a high-side and low-side drive output circuit 100, including a high-side constant current module 1, a high-side drive module 2, a low-side drive module 3, and a low-side constant current module 4 arranged sequentially and interconnected. One end of the high-side constant current module 1 relative to the high-side drive module 2 is connected to an external power supply 10, and the other end of the low-side constant current module 4 relative to the low-side drive module 3 is grounded.

[0026] The high-side and low-side drive output circuit 100 further includes an MCU module 5. The high-side drive module 2 and the low-side drive module 3 are respectively connected to the MCU module 5. The MCU module 5 has a first output pin 51 that outputs a first drive signal to the high-side drive module 2 and a second output pin 52 that outputs a second drive signal to the low-side drive module 2. The first drive signal and the second drive signal are respectively used to activate or deactivate the high-side drive module 2 and the low-side drive module 3.

[0027] In this embodiment, the high-side driving module 2 and the low-side driving module 3 cannot be turned on simultaneously. The MCU module 5 needs to perform timing control, paying attention to the dead time to prevent macro-interference. That is, the first driving signal and the second driving signal need to be issued sequentially with a time difference to activate the high-side driving module 2 and the low-side driving module 3 in sequence. Of course, when the high-side driving module 2 is turned off, the low-side driving module 3 is turned on. In this embodiment, the order is either to activate the high-side driving module 2 first, then the low-side driving module 3, or vice versa; they can never be activated simultaneously.

[0028] In this embodiment, a high-side drive enable module 6 is also provided between the high-side drive module 2 and the MCU module 5. The high-side drive enable module 6 is connected to the third output pin 53 of the MCU module 5, and activates or deactivates the high-side drive module 2 according to the third drive signal output by the third output pin 53.

[0029] Preferably, the first output pin 51 and the third output pin 53 are independent of each other and configured to output the same or different drive signals. The first output pin 51, the second output pin 52, and the third output pin 53 are all configured to output high-level signals or low-level signals. When the first output pin 51 and / or the third output pin 53 outputs a low-level signal, the high-side drive module 2 is turned off. Generally, the high-side drive module 2 is activated when the first output pin 51 and the third output pin 53 output high-level signals. That is, when the high-side drive module 2 is activated, both the first output pin 51 and the third output pin 53 need to output high-level signals simultaneously; and when it is necessary to turn off the high-side drive module 2, any one of the first output pin 51 and the third output pin 53 outputting a low-level signal will turn off the high-side drive module 2.

[0030] Furthermore, in this embodiment, an OUT output module 7 is provided between the high-side driving module 2 and the low-side driving module 3. The high-side driving module 2 outputs a high-level voltage to the OUT output module 7, and the low-side driving module 3 outputs a low-level voltage to the OUT output module 7. The OUT output module 7 outputs the voltage generated by the coordinated control of the high-side driving module 2 and the low-side driving module 3. The first driving signal configuration can activate or deactivate the high-level output of the OUT output module 7. Specifically, when the high-side driving module 2 is activated, the low-side driving module 3 is in a deactivated state, and the OUT output module 7 outputs a high-level voltage. When the high-side driving module 2 is deactivated, the low-side driving module 3 is activated, and the OUT output module 7 receives the low-level voltage output by the low-side driving module 3 for controlled output. Therefore, the OUT output module 7 outputs the voltage generated by the coordinated control of the high-side driving module 2 and the low-side driving module 3.

[0031] When the third output pin 53 outputs a low level, regardless of whether the second output pin 52 outputs a low or high level, the high-side drive module 2 is turned off, meaning the OUT output module 7 has no high-level output. Therefore, the third output pin 53 has higher priority and should be kept high under normal conditions. When a circuit malfunction is detected, the MCU module 5 sets the third output pin 53 to a low level, immediately cutting off the high-level output from the high-side drive module 2. Simultaneously, the MCU module 5 also sets the second output pin 52 to a low level, stopping the OUT output module 7 from outputting a high level. This double protection increases safety redundancy.

[0032] A first monitoring module 8 is provided between the power supply 10 and the high-side drive module 2. The first monitoring module 8 is connected to the voltage input pin 54 of the MCU module 5. The MCU module 5 is configured to adjust the first drive signal and / or the third drive signal output to the high-side drive module 2 according to the voltage received by the voltage input pin 54, so as to activate or deactivate the high-side drive module 2.

[0033] In other words, the voltage input to the voltage input pin 54 received by the MCU module 5 directly affects whether the first drive signal and / or the third drive signal outputs a high-level signal or a low-level signal, thereby affecting the activation or deactivation of the high-side drive module 2. Preferably, the high-side constant current module 1 is disposed between the power supply 10 and the high-side drive module 2, and the first monitoring module 8 is disposed between the high-side constant current module 1 and the high-side drive module 2.

[0034] A second monitoring module 9 is also provided between the OUT output module 7 and the MCU module 5. The second monitoring module 9 is connected to the voltage feedback pin 55 of the MCU module 5. The MCU module 5 is configured to adjust the first driving signal, the second driving signal and the third driving signal according to the voltage received by the voltage feedback pin 55, so as to activate or deactivate the high-side driving module 2 and the low-side driving module 3.

[0035] Appendix Figure 3 This is the normal waveform of the high / low side output circuit 100 with diagnostic output. After power-on, the third output pin 53 outputs a high-level signal, and then the third output pin 53 attempts to output a pulse waveform (3.3V) for diagnosis (when the third output pin 53 outputs a high level, the second output pin 52 simultaneously outputs a low level, maintaining this for a period of time; when the third output pin 53 outputs a low level, the second output pin 52 simultaneously outputs a high level, thus obtaining a pulse waveform). At this time, the OUT output module 7 will also receive a pulse (high level is 24V). Simultaneously, the MCU module 5 monitors the voltage input pin 54 and the voltage feedback pin 55. If the voltage input pin 54 is always at a high level (3.3V), and the voltage feedback pin 55 also simultaneously reads back a synchronous pulse signal, it indicates that the diagnostic result of the output circuit is correct. During normal output, pulses will be continuously emitted for diagnosis, and the system can also detect whether there is a short circuit to 24V or GND in the output circuit, increasing safety.

[0036] Appendix Figure 4 The waveform of the high-side and low-side output circuit 100 when shorted to 24V is shown. After power-on, when the first output pin 51 does not output a high level, the MCU module 5 detects that the voltage input pin 54 is always at a high level, indicating an abnormal reading level. It then keeps the first output pin 51, the second output pin 52, and the third output pin 53 all closed, stopping all outputs.

[0037] Appendix Figure 5 The high and low side output circuit 100 outputs a waveform shorted to GND. After power-on, the first output pin 51 outputs a pulse (3.3V). The waveform readback of the voltage input pin 54 of the MCU module 5 and the voltage feedback pin 55 also show abnormalities. The readback is always at a low level. Then, the first output pin 51, the second output pin 52, and the third output pin 53 are all turned off to stop all outputs and ensure safety in real time.

[0038] In this embodiment, as Figure 2As shown, the high-side constant current module 1 consists of a transistor Q1 and a first resistor R1 and a third resistor R3 connected in series. It can effectively control the current output of the high side, so that the output current is stable below the maximum current output value we want.

[0039] The high-side drive module 2 consists of a PMOS transistor Q2, a first transistor Q4, a first diode D1, a second diode D2, a fifth resistor R5, an eighth resistor R8, and a ninth resistor R9. The MCU control module 5 sends a drive signal to control the on / off state of transistor Q4, thereby controlling the gate of PMOS Q2. At this time, the third output pin 53 of the MCU is kept high. When the first output pin 51 of the MCU module 5 is high, the high-side drive module 2 is turned on, and the OUT output module 7 outputs a high level. When the first output pin 51 of the MCU module 5 is low, the high-side drive module 2 is turned off, and it stops outputting to the OUT output module, thus achieving high-side control output.

[0040] The low-side drive module 3 and the low-side constant current module 4 are composed of a second transistor Q8, a third transistor Q9, a sixteenth resistor R16, and a seventeenth resistor R17. A third diode D3 is provided between the high-side drive module 2 and the low-side drive module 3.

[0041] The high-side drive enable module 6 is composed of a third transistor Q5 and a tenth resistor R10.

[0042] The first monitoring module 8 is composed of a fourth transistor Q3, a second resistor R2, a fourth resistor R4, a sixth resistor R6, and a seventh resistor R7.

[0043] The second monitoring module 9 consists of a fifth transistor Q6, a sixth transistor Q7, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, and a fifteenth resistor R15.

[0044] In summary, the high-side drive output circuit 100 of this utility model sets a high-side drive enable module 6 between the high-side drive module 2 and the MCU module 5, and the high-side drive enable module 6 is connected to the third output pin 53 of the MCU module 5. The high-side drive enable module 6 activates or deactivates the high-side drive module 2 according to the third drive signal output by the third output pin 53. Through the relatively independent first output pin 51 and third output pin 53, the high-side drive module 2 can be activated or deactivated by independently outputting the first drive signal and / or the third drive signal, thus providing double protection for the high-side drive module 2 and increasing safety redundancy.

[0045] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A high-side and low-side drive output circuit, characterized in that, The system includes an MCU module and a high-side driver module and a low-side driver module connected to the MCU module. The MCU module has a first output pin that outputs a first drive signal to the high-side driver module and a second output pin that outputs a second drive signal to the low-side driver module. An OUT output module is connected between the high-side driver module and the low-side driver module. The high-side driver module is externally powered, and one end of the low-side driver module relative to the OUT output module is grounded. A high-side driver enable module is also provided between the high-side driver module and the MCU module. The high-side driver enable module is connected to a third output pin of the MCU module and activates or deactivates the high-side driver module according to the third drive signal received from the third output pin.

2. The high-side and low-side drive output circuit according to claim 1, characterized in that, The first output pin and the third output pin are independent of each other and are configured to output the same or different drive signals.

3. The high-side and low-side drive output circuit according to claim 2, characterized in that, A first monitoring module is provided between the power supply and the high-side drive module. The first monitoring module is connected to the voltage input pin of the MCU module. The MCU module is configured to adjust the first drive signal and / or the third drive signal output to the high-side drive module according to the voltage received by the voltage input pin, so as to activate or deactivate the high-side drive module.

4. The high-side and low-side drive output circuit according to claim 3, characterized in that, A high-side constant current module is also provided between the power supply and the high-side drive module, and the first monitoring module is located between the high-side constant current module and the high-side drive module.

5. The high-side and low-side drive output circuit according to claim 2, characterized in that, Both the first output pin and the third output pin are configured to output a high-level signal or a low-level signal. When the first output pin and / or the third output pin outputs a low-level signal, the high-side driving module is turned off.

6. The high-side and low-side drive output circuit according to claim 1, characterized in that, The high-side driving module is used to output a high-level voltage to the OUT output module, the low-side driving module is used to output a low-level voltage to the OUT output module, and the OUT output module is used to output the voltage generated by the coordinated control of the high-side driving module and the low-side driving module.

7. The high-side and low-side drive output circuit according to claim 6, characterized in that, A second monitoring module is also provided between the OUT output module and the MCU module. The second monitoring module is connected to the voltage feedback pin of the MCU module. The MCU module is configured to adjust the first drive signal, the second drive signal and the third drive signal according to the voltage received by the voltage feedback pin, so as to activate or deactivate the high-side drive module and the low-side drive module.

8. The high-side and low-side drive output circuit according to claim 6, characterized in that, The first drive signal configuration can activate or deactivate the output of the OUT output module.

9. The high-side and low-side drive output circuit according to claim 1, characterized in that, The low-side driving module has a low-side constant current module connected to one end relative to the high-side driving module, and the low-side constant current module has a grounded end relative to the low-side driving module.

10. The high-side and low-side drive output circuit according to claim 9, characterized in that, The MCU module is configured to activate the high-side drive module and the low-side drive module sequentially via the first drive signal, the second drive signal, and the third drive signal.

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