Relay driver chip and relay control system

Abstract

The present invention provides a relay driver chip and a relay control system, wherein the control chip comprises: a signal detection module, a drive circuit, and a control circuit; the signal detection module is used to detect the current output state of the signal output end of the controller; the input end of the drive circuit is connected to the output end of the signal detection module, and is used to output a corresponding first drive level according to the current output state; the first input end of the control circuit is connected to the output end of the drive circuit, and the output end of the control circuit is connected to the coil control end of the relay when in use, and is used to control the relay to be powered on or off according to the first drive level; wherein the control circuit comprises a first resistor, a first MOS transistor, and a first diode; the control circuit solves the problem in the prior art that the relay is in an out-of-control state when an abnormality such as locking occurs at the controller output end, thereby improving the safety of the relay control system.

Description

Technical Field

[0001] The present invention relates to the field of electronic technology, and in particular to a relay driver chip and a relay control system. Background Art

[0002] Relays, as switching devices that control large currents with small currents, are widely used in home appliances or automatic lighting control. Traditional relay control systems include a controller (such as an MCU or PLC) for controlling the relay, a transistor for driving the relay, a freewheeling diode, and a power conversion module for providing a stable power supply to the controller. Traditional relay control systems can achieve the switching function of controlling the relay, but when the controller experiences an abnormality such as locking, the relay will be out of control, posing a safety risk of damage to subsequent circuits or devices. Summary of the Invention

[0003] In response to the deficiencies in the prior art, the relay driver chip and relay control system provided by the present invention solve the problem in the prior art that the relay is out of control when an abnormality such as locking occurs at the controller output end, thereby improving the safety of the relay control system.

[0004] In a first aspect, the present invention provides a relay driver chip, comprising: a signal detection module, a drive circuit, and a control circuit; the input end of the signal detection module is connected to the signal output end of a controller when in use, for detecting the current output state of the signal output end of the controller; the input end of the drive circuit is connected to the output end of the signal detection module, for outputting a corresponding first drive level according to the current output state; the first input end of the control circuit is connected to the output end of the drive circuit, and the output end of the control circuit is connected to the coil control end of a relay when in use, for controlling the relay to be powered on or off according to the first drive level; wherein the control circuit comprises a first resistor, a first MOS transistor, and a first diode; the first end of the first resistor is connected to the output end of the drive circuit, the second end of the first resistor is connected to the gate of the first MOS transistor, the source of the first MOS transistor is grounded, the anode of the first diode is connected to the drain of the first MOS transistor, the cathode of the first diode is connected to an external power supply, and the drain of the first MOS transistor is the first output end of the relay driver chip.

[0005] Optionally, the control circuit further includes: a second resistor and a second MOS transistor; a first end of the second resistor is connected to the first level output end of the controller, a second end of the second resistor is connected to the gate of the second MOS transistor, the source of the second MOS transistor is grounded, and the drain of the second MOS transistor is connected to the source of the first MOS transistor.

[0006] Optionally, the control circuit further includes: a third MOS transistor and a fourth MOS transistor; the gate of the third MOS transistor is connected to the drain of the first MOS transistor, and the source of the third MOS transistor is connected to the external power supply; the gate of the fourth MOS transistor is connected to the drain of the second MOS transistor, the source of the fourth MOS transistor is connected to the drain of the third MOS transistor, and the drain of the fourth MOS transistor is connected to the coil control end of the relay when in use; wherein the drain of the fourth MOS transistor is the second output end of the relay driver chip.

[0007] Optionally, the control circuit further includes: a third resistor, a fourth resistor, a fifth resistor, and a sixth resistor; a first end of the third resistor is connected to the drain of the first MOS transistor, a second end of the third resistor is connected to the gate of the third MOS transistor, a first end of the fourth resistor is connected to the second end of the third resistor, and a second end of the fourth resistor is connected to the source of the third MOS transistor; a first end of the fifth resistor is connected to the drain of the second MOS transistor, a second end of the fifth resistor is connected to the gate of the fourth MOS transistor, a first end of the sixth resistor is connected to the second end of the fifth resistor, and a second end of the sixth resistor is connected to the source of the fourth MOS transistor.

[0008] Optionally, the driver chip further includes: a seventh resistor, a fifth MOS transistor, and a second diode; the first end of the seventh resistor is connected to the second level output end of the controller when in use, the second end of the seventh resistor is connected to the gate of the fifth MOS transistor, the source of the fifth MOS transistor is grounded, the anode of the second diode is connected to the drain of the fifth MOS transistor, and the anode of the second diode is connected to the external power supply; wherein the drain of the fifth MOS transistor is the third output end of the relay driver chip.

[0009] Optionally, the driver chip further includes: an eighth resistor, a sixth MOS transistor, and a third diode; the first end of the eighth resistor is connected to the third level output terminal of the controller when in use, the second end of the eighth resistor is connected to the gate of the sixth MOS transistor, the source of the sixth MOS transistor is grounded, the anode of the third diode is connected to the drain of the sixth MOS transistor, and the anode of the third diode is connected to the external power supply; wherein the drain of the sixth MOS transistor is the fourth output terminal of the relay driver chip.

[0010] Optionally, the driver chip also includes: a voltage conversion module, the input end of the voltage conversion module is connected to the second external power supply when in use, and the output end of the voltage conversion module is connected to the power supply end of the controller when in use, and is used to convert the output voltage of the second external power supply to obtain a target voltage, so that the target voltage provides electrical energy for the controller; or / and, a fourth diode, the anode of the fourth diode is connected to the output end of the voltage conversion module, and the cathode of the fourth diode is connected to the power supply end of the controller.

[0011] Optionally, the driver chip further includes: a controller.

[0012] In a second aspect, the present invention provides a relay control system, which includes: a controller, a first relay and a relay driver chip; the controller is connected to the input end of the relay driver chip, the first end of the coil of the first relay is connected to the first power supply end of the relay driver chip, and the second end of the coil of the first relay is connected to the first output end of the relay driver chip.

[0013] Optionally, the control system also includes: a second relay, wherein the first end of the coil of the second relay is connected to the second output end of the relay driver chip, and the second end of the coil of the second relay is connected to the third output end of the relay driver chip; or / and, a third relay, wherein the first end of the coil of the third relay is connected to the third output end of the relay driver circuit, and the second end of the coil of the third relay is connected to the first power supply end of the relay driver chip; or / and, a fourth relay, wherein the first end of the coil of the fourth relay is connected to the fourth output end of the relay driver circuit, and the second end of the coil of the fourth relay is connected to the first power supply end of the relay driver chip; or / and, a fifth relay, wherein the first end of the coil of the fifth relay is grounded, and the second end of the coil of the fifth relay is connected to the second output end of the relay driver chip.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The present invention performs status detection on the signal output by the controller through the signal detection module. When the control output is a square wave signal, the relay is driven by the driving circuit and the control circuit. This effectively solves the problem of the relay being out of control when an abnormality such as locking occurs at the output end of the controller, thereby improving the safety of the relay control system.

[0016] 2. The present invention improves the application range of the relay driver chip by integrating the signal detection module, the drive circuit and the control circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1 FIG2 is a circuit diagram of a relay driver chip provided by an embodiment of the present invention;

[0020] Figure 2 FIG2 is a circuit diagram of another relay driver chip provided by an embodiment of the present invention;

[0021] Figure 3 FIG. 1 is a circuit diagram of another relay driver chip provided by an embodiment of the present invention;

[0022] Figure 4 FIG. 1 is a circuit diagram of another relay driver chip provided by an embodiment of the present invention;

[0023] Figure 5 FIG2 is a schematic structural diagram of a relay control system provided by an embodiment of the present invention;

[0024] Figure 6 Shown is a structural schematic diagram of another relay control system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The functional units with the same labels in the examples of the present invention have the same and similar structures and functions.

[0026] Example 1

[0027] Figure 1 FIG. 1 is a circuit diagram of a relay driver chip provided by an embodiment of the present invention; FIG. Figure 1 As shown, the relay driver chip 100 provided by the present invention specifically includes:

[0028] Signal detection module 110, driving circuit 120 and control circuit 130;

[0029] The input end of the signal detection module 110 is connected to the signal output end of the controller 200 when in use, and is used to detect the current output state of the signal output end of the controller 200;

[0030] The input end of the driving circuit 120 is connected to the output end of the signal detection module 110, and is used to output a corresponding first driving level according to the current output state;

[0031] The first input terminal of the control circuit 130 is connected to the output terminal of the drive circuit 120, and the output terminal of the control circuit 130 is connected to the coil control terminal of the relay when in use, for controlling the relay to be powered on or off according to the first drive level;

[0032] The control circuit 130 includes a first resistor R1, a first MOS transistor Q1, and a first diode D1; a first end of the first resistor R1 is connected to the output end of the drive circuit 120, a second end of the first resistor R1 is connected to the gate of the first MOS transistor Q1, the source of the first MOS transistor Q1 is grounded, an anode of the first diode D1 is connected to the drain of the first MOS transistor Q1, a cathode of the first diode D1 is connected to an external power supply, and the drain of the first MOS transistor Q1 is the first output end of the relay driver chip.

[0033] It should be noted that, in this embodiment, the signal detection module is used to detect whether the signal output end of the controller outputs a square wave signal, and the current output state includes a square wave signal and no square wave signal; if the current output state is a square wave signal, the first drive level output by the drive circuit is a high level, so that the first MOS tube in the control circuit is turned on, and the first output end of the relay driver chip outputs a low level, thereby energizing the relay; wherein, the first diode is a freewheeling diode, which can protect the first MOS tube.

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] 1. The present invention performs status detection on the signal output by the controller through the signal detection module. When the control output is a square wave signal, the relay is driven by the driving circuit and the control circuit. This effectively solves the problem of the relay being out of control when an abnormality such as locking occurs at the output end of the controller, thereby improving the safety of the relay control system.

[0036] 2. The present invention improves the application range of the relay driver chip by integrating the signal detection module, the drive circuit and the control circuit.

[0037] Example 2

[0038] Figure 2 FIG. 1 is a circuit diagram of another relay driver chip provided by an embodiment of the present invention. Figure 2 As shown, compared with the first embodiment, the control circuit provided in this embodiment further includes:

[0039] A second resistor R2 and a second MOS transistor Q2;

[0040] A first end of the second resistor R2 is connected to the first level output end of the controller 200, a second end of the second resistor R2 is connected to the gate of the second MOS transistor Q2, a source of the second MOS transistor Q2 is grounded, and a drain of the second MOS transistor Q2 is connected to the source of the first MOS transistor Q1.

[0041] It should be noted that when the signal output end of the controller 200 outputs a square wave signal and the first level output end of the controller 200 outputs a high level, the first MOS tube Q1 and the second MOS tube Q2 are turned on at the same time, and the first output end of the relay driver chip is at a low level, so that the relay is energized.

[0042] In this embodiment, if the first MOS transistor Q1 or the second MOS transistor Q2 is short-circuited, the problem of the relay being powered on all the time and losing control is effectively avoided. Therefore, by connecting the first MOS transistor Q1 and the second MOS transistor Q2 in series to control the relay, the risk of the relay losing control when the MOS transistor is damaged is effectively reduced.

[0043] Example 3

[0044] Figure 3 FIG. 1 is a circuit diagram of another relay driver chip provided by an embodiment of the present invention; FIG. Figure 3 As shown, in this embodiment, the control circuit further includes: a third MOS transistor Q3 and a fourth MOS transistor Q4; the gate of the third MOS transistor Q3 is connected to the drain of the first MOS transistor Q1, and the source of the third MOS transistor Q3 is connected to the external power supply; the gate of the fourth MOS transistor Q4 is connected to the drain of the second MOS transistor Q2, the source of the fourth MOS transistor Q4 is connected to the drain of the third MOS transistor Q3, and the drain of the fourth MOS transistor Q4 is connected to the coil control end of the relay when in use; wherein the drain of the fourth MOS transistor Q4 is the second output end of the relay driver chip.

[0045] In this embodiment, the control circuit further includes: a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6; a first end of the third resistor R3 is connected to the drain of the first MOS transistor Q1, a second end of the third resistor R3 is connected to the gate of the third MOS transistor Q3, a first end of the fourth resistor R4 is connected to the second end of the third resistor R3, and a second end of the fourth resistor R4 is connected to the source of the third MOS transistor Q3; a first end of the fifth resistor R5 is connected to the drain of the second MOS transistor Q2, a second end of the fifth resistor R5 is connected to the gate of the fourth MOS transistor Q4, a first end of the sixth resistor R6 is connected to the second end of the fifth resistor R5, and a second end of the sixth resistor R6 is connected to the source of the fourth MOS transistor Q4.

[0046] It should be noted that when the signal output terminal of the controller outputs a square wave signal and the first level output terminal of the controller outputs a high level, the first MOS transistor Q1, the second MOS transistor Q2, the third MOS transistor Q3 and the fourth MOS transistor Q4 are turned on at the same time, and the second output terminal of the relay driver chip is high level, so that the relay is energized.

[0047] In this embodiment, if the third MOS transistor Q3 or the fourth MOS transistor Q4 is short-circuited, the problem of the relay being powered on all the time and losing control is effectively avoided. Therefore, by connecting the third MOS transistor Q3 and the fourth MOS transistor Q4 in series to control the relay, the risk of the relay losing control when the MOS transistor is damaged is effectively reduced.

[0048] In addition, both this embodiment and the above-mentioned second embodiment have the function of preventing the problem of the relay losing control due to damage to the MOS tube at the output port of the driver chip. However, the difference between the two embodiments is that in the second embodiment, the first output terminal of the driver chip can output a low level to achieve low-level driving of the relay; while in the present embodiment, the second output terminal of the driver chip can output a high level to achieve high-level driving of the relay, thereby enabling the driver chip to drive the relay in different application scenarios, thereby improving the application range of the driver chip.

[0049] Example 4

[0050] Figure 4 FIG. 1 is a circuit diagram of another relay driver chip provided by an embodiment of the present invention; FIG. Figure 4As shown, the driver chip provided in this embodiment further includes: a seventh resistor R7, a fifth MOS transistor Q5, and a second diode D2; the first end of the seventh resistor R7 is connected to the second level output end of the controller when in use, the second end of the seventh resistor R7 is connected to the gate of the fifth MOS transistor Q5, the source of the fifth MOS transistor Q5 is grounded, the anode of the second diode D2 is connected to the drain of the fifth MOS transistor Q5, and the anode of the second diode D2 is connected to the external power supply; wherein the drain of the fifth MOS transistor Q5 is the third output end of the relay driver chip.

[0051] In this embodiment, the driver chip further includes: an eighth resistor R8, a sixth MOS transistor Q6, and a third diode D3; a first end of the eighth resistor R8 is connected to the third level output end of the controller when in use, a second end of the eighth resistor R8 is connected to the gate of the sixth MOS transistor Q6, a source of the sixth MOS transistor Q6 is grounded, an anode of the third diode D3 is connected to the drain of the sixth MOS transistor Q6, and an anode of the third diode D3 is connected to the external power supply; wherein the drain of the sixth MOS transistor Q6 is the fourth output end of the relay driver chip.

[0052] In this embodiment, the driver chip also includes: a voltage conversion module, the input end of the voltage conversion module is connected to the second external power supply when in use, and the output end of the voltage conversion module is connected to the power supply end of the controller when in use, and is used to convert the output voltage of the second external power supply to obtain a target voltage, so that the target voltage provides electrical energy for the controller; or / and, a fourth diode D4, the anode of the fourth diode D4 is connected to the output end of the voltage conversion module, and the cathode of the fourth diode D4 is connected to the power supply end of the controller.

[0053] It should be noted that the relay driver chip provided in this embodiment includes a voltage conversion module for powering the controller, two relay drivers with self-monitoring, one multi-pole relay control driver and two ordinary relay drivers; Figure 4As shown, the LDO reduces the external input voltage to 5V to power the controller. LO1 and LO2 are two common drivers. When the LI1 input is high, LO1 outputs low, turning on the relay; when the LI1 input is low, LO1 is off, turning off the relay. When the LI2 input is high, LO2 outputs low; otherwise, LO2 is off. L03 is a self-monitored driver circuit. When a waveform signal is present at PWM1, LO3 outputs low, turning on the relay; otherwise, L03 is off, turning off the relay. PWM2 and HI form a multi-channel self-monitored relay driver. When a waveform signal is present at PWM2 and the HI input is high, HO is high; otherwise, it is off. This driver can operate independently as a monitored bipolar relay driver or in conjunction with LO1, LO2, and LO3 as a monitored tripolar relay driver, effectively reducing the risk of controller lockup, driver transistor burnout, and relay loss of control.

[0054] Example 5

[0055] Figure 5 FIG. 1 is a schematic diagram of a structure of a relay control system provided by an embodiment of the present invention; FIG. Figure 5 As shown, the control system provided in this embodiment includes: a controller, a first relay and the relay driver chip in the above-mentioned embodiment 4; the controller is connected to the input end of the relay driver chip, the first end of the coil of the first relay is connected to the first power supply end of the relay driver chip, and the second end of the coil of the first relay is connected to the first output end of the relay driver chip.

[0056] In this embodiment, the control system also includes: a second relay, wherein the first end of the coil of the second relay is connected to the second output end of the relay driver chip, and the second end of the coil of the second relay is connected to the third output end of the relay driver chip; a third relay, wherein the first end of the coil of the third relay is connected to the third output end of the relay driver circuit, and the second end of the coil of the third relay is connected to the first power supply end of the relay driver chip.

[0057] Example 6

[0058] Figure 6 FIG. 1 is a schematic diagram showing the structure of another relay control system provided by an embodiment of the present invention; Figure 6 As shown, the control system provided in this embodiment includes: a controller, a first relay and the relay driver chip in the above-mentioned embodiment 4; the controller is connected to the input end of the relay driver chip, the first end of the coil of the first relay is connected to the first power supply end of the relay driver chip, and the second end of the coil of the first relay is connected to the first output end of the relay driver chip.

[0059] In this embodiment, the control system also includes: a third relay, wherein the first end of the coil of the third relay is connected to the third output end of the relay drive circuit, and the second end of the coil of the third relay is connected to the first power supply end of the relay drive chip; a fourth relay; the first end of the coil of the fourth relay is connected to the fourth output end of the relay drive circuit, and the second end of the coil of the fourth relay is connected to the first power supply end of the relay drive chip; and a fifth relay, wherein the first end of the coil of the fifth relay is grounded, and the second end of the coil of the fifth relay is connected to the second output end of the relay drive chip.

[0060] In this embodiment, the control system also includes: a first capacitor, a second capacitor and a current-limiting resistor; the first end of the first capacitor is connected to the power output end of the relay driver chip, and the second end of the first capacitor is grounded; the first end of the second capacitor is connected to the second power end of the relay driver chip, and the second end of the second capacitor is grounded, the first end of the current-limiting resistor is connected to an external power supply when in use, and the second end of the current-limiting resistor is connected to the first end of the second capacitor.

[0061] It should be noted that if Figure 5 As shown, it is possible to realize one common relay driving relay 3, one relay with self-monitoring driving relay 1 and one 3-pole relay with self-monitoring driving relay 2; Figure 6 As shown, two common relays can drive relays 3 and 4, one relay with self-monitoring can drive relay 1, and one 2-pole relay with self-monitoring can drive relay 5.

[0062] This embodiment integrates a relay driver and LDO into a single chip, enabling monitoring of controller drive signals and multi-channel relay drive control. This prevents controller lockout and relay loss of control, as well as reduces the risk of driver transistor burnout. Using an integrated circuit, the controller input signal is monitored, shutting off the relay if the controller loses waveform input. Compared to traditional single-ended control relays, this solution controls both ends of the relay, offering advantages such as fewer components, lower cost, and higher safety. The integrated solution also simplifies layout, requiring only a small number of external capacitors, making it an optimal PCB layout solution for compact applications.

[0063] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0064] The foregoing description is intended only to provide specific embodiments of the present invention, which will enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein, but is intended to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A relay driver chip, characterized in that: The driver chip includes: Signal detection module, drive circuit and control circuit; The input end of the signal detection module is connected to the signal output end of the controller when in use, and is used to detect the current output state of the signal output end of the controller; The input end of the driving circuit is connected to the output end of the signal detection module, and is used to output a corresponding first driving level according to the current output state; The first input terminal of the control circuit is connected to the output terminal of the drive circuit, and the output terminal of the control circuit is connected to the coil control terminal of the relay when in use, for controlling the relay to be powered on or off according to the first drive level; The control circuit includes a first resistor, a first MOS transistor, and a first diode; a first end of the first resistor is connected to the output end of the drive circuit, a second end of the first resistor is connected to the gate of the first MOS transistor, a source of the first MOS transistor is grounded, an anode of the first diode is connected to the drain of the first MOS transistor, a cathode of the first diode is connected to an external power supply, and the drain of the first MOS transistor is the first output end of the relay driver chip; The signal detection module detects whether the signal output terminal of the controller outputs a square wave signal, and the current output state includes the presence of a square wave signal and the absence of a square wave signal. If the current output state is the presence of a square wave signal, the first drive level output by the drive circuit is a high level, so that the first MOS tube in the control circuit is turned on, and the first output terminal of the relay drive chip outputs a low level, so that the relay is energized.

2. The relay driver chip according to claim 1, wherein: The control circuit further includes: a second resistor and a second MOS tube; The first end of the second resistor is connected to the first level output end of the controller, the second end of the second resistor is connected to the gate of the second MOS transistor, the source of the second MOS transistor is grounded, and the drain of the second MOS transistor is connected to the source of the first MOS transistor.

3. The relay driver chip according to claim 2, wherein: The control circuit further includes: A third MOS tube and a fourth MOS tube; The gate of the third MOS transistor is connected to the drain of the first MOS transistor, and the source of the third MOS transistor is connected to the external power supply; The gate of the fourth MOS transistor is connected to the drain of the second MOS transistor, the source of the fourth MOS transistor is connected to the drain of the third MOS transistor, and the drain of the fourth MOS transistor is connected to the coil control end of the relay when in use; Wherein, the drain of the fourth MOS tube is the second output end of the relay driving chip.

4. The relay driver chip according to claim 3, wherein: The control circuit further includes: a third resistor, a fourth resistor, a fifth resistor, and a sixth resistor; A first end of the third resistor is connected to the drain of the first MOS transistor, a second end of the third resistor is connected to the gate of the third MOS transistor, a first end of the fourth resistor is connected to the second end of the third resistor, and a second end of the fourth resistor is connected to the source of the third MOS transistor; A first end of the fifth resistor is connected to the drain of the second MOS transistor, a second end of the fifth resistor is connected to the gate of the fourth MOS transistor, a first end of the sixth resistor is connected to the second end of the fifth resistor, and a second end of the sixth resistor is connected to the source of the fourth MOS transistor.

5. The relay driver chip according to claim 4, wherein: The driver chip further includes: A seventh resistor, a fifth MOS tube and a second diode; The first end of the seventh resistor is connected to the second level output end of the controller when in use, the second end of the seventh resistor is connected to the gate of the fifth MOS transistor, the source of the fifth MOS transistor is grounded, the anode of the second diode is connected to the drain of the fifth MOS transistor, and the anode of the second diode is connected to the external power supply; Wherein, the drain of the fifth MOS tube is the third output terminal of the relay driver chip.

6. The relay driver chip according to claim 5, wherein: The driver chip further includes: an eighth resistor, a sixth MOS tube, and a third diode; The first end of the eighth resistor is connected to the third level output end of the controller when in use, the second end of the eighth resistor is connected to the gate of the sixth MOS transistor, the source of the sixth MOS transistor is grounded, the anode of the third diode is connected to the drain of the sixth MOS transistor, and the anode of the third diode is connected to the external power supply; Wherein, the drain of the sixth MOS tube is the fourth output terminal of the relay driver chip.

7. The relay driver chip according to claim 6, wherein: The driver chip further includes: a voltage conversion module, wherein the input end of the voltage conversion module is connected to the second external power supply when in use, and the output end of the voltage conversion module is connected to the power supply end of the controller when in use, and is used to convert the output voltage of the second external power supply to obtain a target voltage, so that the target voltage provides power to the controller; or / and, a fourth diode, wherein the anode of the fourth diode is connected to the output end of the voltage conversion module, and the cathode of the fourth diode is connected to the power supply end of the controller.

8. The relay driver chip according to any one of claims 1 to 7, wherein: The driving chip further includes: a controller.

9. A relay control system, characterized in that: The control system includes: A controller, a first relay, and the relay driver chip according to claim 7; The controller is connected to the input end of the relay driver chip, the first end of the coil of the first relay is connected to the first power supply end of the relay driver chip, and the second end of the coil of the first relay is connected to the first output end of the relay driver chip.

10. The relay control system according to claim 9, wherein: The control system further comprises: a second relay, wherein a first end of a coil of the second relay is connected to a second output end of the relay driver chip, and a second end of a coil of the second relay is connected to a third output end of the relay driver chip; or / and, a third relay, wherein a first end of a coil of the third relay is connected to a third output end of the relay drive circuit, and a second end of a coil of the third relay is connected to a first power supply end of the relay drive chip; or / and, a fourth relay; a first end of the coil of the fourth relay is connected to the fourth output end of the relay drive circuit, and a second end of the coil of the fourth relay is connected to the first power supply end of the relay drive chip; Or / and, a fifth relay, wherein a first end of the coil of the fifth relay is grounded, and a second end of the coil of the fifth relay is connected to the second output end of the relay driver chip.

Images