Solid State Relay Circuit and Electronic Device

Abstract

The present invention discloses a solid-state relay circuit and an electronic device. The solid-state relay circuit includes a first isolation switch circuit, a second isolation switch circuit, and a power control circuit. When a turn-on signal is received, the power control circuit conducts, enabling the drive power supply to be connected to the ground wire through the first isolation switch circuit and the second isolation switch circuit. The first isolation switch circuit and the second isolation switch circuit are turned on when the power control circuit conducts, causing the motor to be powered on and operate. The technical solution of the present invention realizes the function of a high-power solid-state relay through the first isolation switch circuit, the second isolation switch circuit, and the power control circuit, thereby reducing the circuit area occupied by the switching module and decreasing the volume and weight of the electronic device.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic circuits, and particularly to a solid-state relay circuit and an electronic device. Background Art

[0002] In some deep-sea devices, the power supply of high-power DC motors is generally provided by a 48V lithium battery, and the power-on and power-off are controlled by a high-power relay. Power relays are generally divided into mechanical relays and solid-state relays. Solid-state relays are generally used in deep-sea applications. However, the switching module in the solid-state relay occupies a relatively large circuit area, and deep-sea applications require electronic devices to be small in size and light in weight, resulting in the inability to meet the application requirements when using solid-state relays.

[0003] The above content is only used to assist in understanding the technical solution of the present invention, and does not represent an admission that the above content is prior art. Summary of the Invention

[0004] The main object of the present invention is to provide a solid-state relay circuit and an electronic device, aiming to solve the technical problem that the switching module in the solid-state relay in existing deep-sea devices occupies a relatively large circuit area.

[0005] To achieve the above object, the present invention provides a solid-state relay circuit, which includes a first isolation switch circuit, a second isolation switch circuit, and a power control circuit; wherein

[0006] The power control circuit is used to conduct when corresponding to an enabling signal, so that the driving power supply is connected to the ground wire through the first isolation switch circuit and the second isolation switch circuit;

[0007] The first isolation switch circuit and the second isolation switch circuit are used to turn on when the power control circuit conducts, so that the motor is powered on and operates.

[0008] Preferably, the first isolation switch circuit includes a first opto-isolated gate driver, a second opto-isolated gate driver, a first power transistor, and a second power transistor; wherein

[0009] The driving input terminal of the first opto-isolated gate driver is connected to the driving power supply, the driving output terminal of the first opto-isolated gate driver is connected to the driving input terminal of the second opto-isolated gate driver, and the driving output terminal of the second opto-isolated gate driver is connected to the second isolation switch circuit;

[0010] The first control terminal of the first opto-isolated gate driver is respectively connected to the source electrodes of the first power transistor and the second power transistor. The second control terminal of the first opto-isolated gate driver is connected to the first control terminal of the second opto-isolated gate driver. The second control terminal of the second opto-isolated gate driver is respectively connected to the gate electrodes of the first power transistor and the second power transistor;

[0011] The drain electrode of the first power transistor is connected to the power supply. The drain electrode of the second power transistor is connected to the second isolation switch circuit.

[0012] Preferably, the second isolation switch circuit includes a third opto-isolated gate driver, a fourth opto-isolated gate driver, a third power transistor, and a fourth power transistor; wherein

[0013] The drive output terminal of the third opto-isolated gate driver is connected to the drive input terminal of the fourth opto-isolated gate driver. The drive output terminal of the fourth opto-isolated gate driver is connected to the input terminal of the power control circuit;

[0014] The first control terminal of the third opto-isolated gate driver is respectively connected to the source electrodes of the third power transistor and the fourth power transistor. The second control terminal of the third opto-isolated gate driver is connected to the first control terminal of the fourth opto-isolated gate driver. The second control terminal of the fourth opto-isolated gate driver is respectively connected to the gate electrodes of the third power transistor and the fourth power transistor;

[0015] The source electrode of the third power transistor is connected to the source electrode of the second power transistor. The drain electrode of the fourth power transistor is grounded.

[0016] Preferably, the solid-state relay circuit further includes a transient suppression diode. The anode of the transient suppression diode is connected to the drain electrode of the third power transistor. The cathode of the transient suppression diode is connected to the drain electrode of the second power transistor.

[0017] Preferably, the solid-state relay circuit includes a first capacitor. The first end of the first capacitor is connected to the first control terminal of the third opto-isolated gate driver. The second end of the first capacitor is connected to the second control terminal of the fourth opto-isolated gate driver.

[0018] Preferably, the solid-state relay circuit further includes a fuse. The first end of the fuse is connected to the power supply. The second end of the fuse is connected to the drain electrode of the first power transistor.

[0019] Preferably, the power control circuit includes a first resistor, a second resistor, a microcontroller, and a fifth power transistor; wherein

[0020] The gate of the fifth power tube is connected to the microcontroller, and the drain of the fifth power tube is connected to the second isolation switch circuit through the first resistor; the first end of the second resistor is connected to the gate of the fifth power tube, and the second end of the second resistor is connected to the source of the fifth power tube; the source of the fifth power tube is grounded.

[0021] Preferably, the solid-state relay circuit further includes a filtering circuit for filtering the power supply.

[0022] Preferably, the filtering circuit includes a first diode, a second diode, a third diode, and a fourth diode; wherein

[0023] The cathode of the first diode is connected to the power supply, the anode of the first diode is connected to the cathode of the second diode, and the anode of the second diode is grounded; the cathode of the second diode is also connected to the positive pole of the motor;

[0024] The cathode of the third diode is connected to the power supply, the anode of the third diode is connected to the cathode of the fourth diode, and the anode of the fourth diode is grounded; the cathode of the fourth diode is also connected to the negative pole of the motor.

[0025] To achieve the above object, the present invention also provides an electronic device including the solid-state relay circuit as described above.

[0026] The present invention provides a solid-state relay circuit, which includes a first isolation switch circuit, a second isolation switch circuit, and a power control circuit. The power control circuit conducts in response to an enabling signal, so that the drive power supply is connected to the ground wire through the first isolation switch circuit and the second isolation switch circuit. The first isolation switch circuit and the second isolation switch circuit are turned on when the power control circuit conducts, enabling the motor to power on and work. The technical solution of the present invention realizes the function of a high-power solid-state relay through the first isolation switch circuit, the second isolation switch circuit, and the power control circuit, thereby reducing the circuit area occupied by the switching module and reducing the volume and weight of the electronic device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of a module of an embodiment of the solid-state relay circuit of the present invention;

[0028] Figure 2 It is a circuit schematic diagram of an embodiment of the solid-state relay circuit of the present invention.

[0029] Explanation of the reference numerals in the drawings:

[0030]

[0031] The realization of the object, functional features and advantages of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0032] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0033] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0034] In addition, the descriptions involving "first", "second", etc. in the present invention are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions appears to be contradictory or unable to be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0035] The present invention provides a solid-state relay circuit.

[0036] Referring to Figure 1 , in the present invention, the solid-state relay circuit includes a first isolation switch circuit 100, a second isolation switch circuit 200, and a power control circuit 300. In this embodiment, the circuit structures of the first isolation switch circuit 100 and the second isolation switch circuit 200 are basically the same. The first isolation switch circuit 100 controls the on / off of the positive power supply of the motor, and the second isolation switch circuit 200 controls the on / off of the negative power supply of the motor, thereby realizing the control of the motor power supply. The power control circuit 300 receives an external control instruction and controls the on / off of the driving power supply VCC. It should be noted that both the first isolation switch circuit 100 and the second isolation switch circuit 200 are composed of an isolation driver and a switching tube. Since the isolation driver and the switching tube are small in volume, the occupied area of the circuit can be effectively reduced.

[0037] The power control circuit 300 is used to conduct when corresponding to an enabling signal, so that the driving power supply VCC is connected to the ground wire through the first isolation switch circuit 100 and the second isolation switch circuit 200;

[0038] The first isolation switch circuit 100 and the second isolation switch circuit 200 are used to turn on when the power control circuit 300 conducts, so that the motor is powered on and operates.

[0039] The present invention provides a solid-state relay circuit, which includes a first isolation switch circuit 100, a second isolation switch circuit 200, and a power control circuit 300. The power control circuit 300 conducts when corresponding to an enabling signal, so that the driving power supply VCC is connected to the ground wire through the first isolation switch circuit 100 and the second isolation switch circuit 200. The first isolation switch circuit 100 and the second isolation switch circuit 200 turn on when the power control circuit 300 conducts, so that the motor is powered on and operates. The technical solution of the present invention realizes the function of a high-power solid-state relay through the first isolation switch circuit 100, the second isolation switch circuit 200, and the power control circuit 300, thereby reducing the circuit area occupied by the switching module and reducing the volume and weight of the electronic device.

[0040] Referring to Figure 2 , specifically, the first isolation switch circuit 100 includes a first opto-coupler isolation gate driver U1, a second opto-coupler isolation gate driver U2, a first power transistor T1, and a second power transistor T2; wherein

[0041] The driving input terminal of the first opto-coupler isolation gate driver U1 is connected to the driving power supply VCC, the driving output terminal of the first opto-coupler isolation gate driver U1 is connected to the driving input terminal of the second opto-coupler isolation gate driver U2, and the driving output terminal of the second opto-coupler isolation gate driver U2 is connected to the second isolation switch circuit 200;

[0042] The first control terminal of the first opto-coupler isolation gate driver U1 is respectively connected to the source electrodes of the first power transistor T1 and the second power transistor T2, the second control terminal of the first opto-coupler isolation gate driver U1 is connected to the first control terminal of the second opto-coupler isolation gate driver U2, and the second control terminal of the second opto-coupler isolation gate driver U2 is respectively connected to the gate electrodes of the first power transistor T1 and the second power transistor T2;

[0043] The drain electrode of the first power transistor T1 is connected to the power supply, and the drain electrode of the second power transistor T2 is connected to the second isolation switch circuit 200.

[0044] Similarly, the second isolation switch circuit 200 includes a third opto-isolated gate driver U3, a fourth opto-isolated gate driver U4, a third power transistor T3, and a fourth power transistor T4; where

[0045] The driving output end of the third opto-isolated gate driver U3 is connected to the driving input end of the fourth opto-isolated gate driver U4, and the driving output end of the fourth opto-isolated gate driver U4 is connected to the input end of the power control circuit 300;

[0046] The first control end of the third opto-isolated gate driver U3 is respectively connected to the source electrodes of the third power transistor T3 and the fourth power transistor T4, the second control end of the third opto-isolated gate driver U3 is connected to the first control end of the fourth opto-isolated gate driver U4, and the second control end of the fourth opto-isolated gate driver U4 is respectively connected to the gate electrodes of the third power transistor T3 and the fourth power transistor T4;

[0047] The source electrode of the third power transistor T3 is connected to the source electrode of the second power transistor T2, and the drain electrode of the fourth power transistor T4 is grounded.

[0048] It should be noted that the first power transistor T1, the second power transistor T2, the third power transistor T3, and the fourth power transistor T4 are all N-MOS transistors. Among them, the first power transistor T1 and the second power transistor T2 form a "back-to-back" N-MOS transistor, and the third power transistor T3 and the fourth power transistor T4 form a "back-to-back" N-MOS transistor.

[0049] Furthermore, the solid-state relay circuit further includes a transient suppression diode D5. The anode of the transient suppression diode D5 is connected to the drain electrode of the third power transistor T3, and the cathode of the transient suppression diode D5 is connected to the drain electrode of the second power transistor T2. The transient suppression diode D5 can prevent the voltage difference between the positive and negative poles of the motor power supply from exceeding the input range of the motor power supply.

[0050] Preferably, the solid-state relay circuit includes a first capacitor C1. The first end of the first capacitor C1 is connected to the first control end of the third opto-isolated gate driver U3, and the second end of the first capacitor C1 is connected to the second control end of the fourth opto-isolated gate driver U4.

[0051] It should be noted that in this embodiment, the capacitor is connected in parallel between the third opto-isolated gate driver U3 and the fourth opto-isolated gate driver U4, and it can also be connected in parallel between the first opto-isolated gate driver U1 and the second opto-isolated gate driver U2. In this embodiment, the capacitance value of the first capacitor C1 is 470 nF, and a ceramic capacitor is used. By means of the first capacitor C1, the conduction time of the pair of N-MOS transistors, namely the third power transistor T3 and the fourth power transistor T4, is increased, so as to achieve the purpose of soft start of the DC motor power supply, and solve the hidden danger that other electronic devices on the DC power line are under-voltage and restart invalidly due to the short-circuit effect when the DC motor is powered on instantaneously, which may pull down the battery voltage.

[0052] Further, the solid-state relay circuit further includes a fuse F1. The first end of the fuse F1 is connected to the power supply, and the second end of the fuse F1 is connected to the drain of the first power transistor T1. It can be understood that the fuse F1 can prevent excessive current in the circuit from damaging other electronic devices and plays a role in overcurrent protection.

[0053] Specifically, the power control circuit 300 includes a first resistor R1, a second resistor R2, a microcontroller MCU, and a fifth power transistor T5; where

[0054] The gate of the fifth power transistor T5 is connected to the microcontroller MCU. The drain of the fifth power transistor T5 is connected to the second isolation switch circuit 200 via the first resistor R1. The first end of the second resistor R2 is connected to the gate of the fifth power transistor T5, and the second end of the second resistor R2 is connected to the source of the fifth power transistor T5. The source of the fifth power transistor T5 is grounded.

[0055] In this embodiment, the conduction of the first isolation switch circuit 100 and the second isolation switch circuit 200 is indirectly controlled by controlling the conduction of the fifth power transistor T5 through the MCU controller. The first resistor R1 is the current-limiting resistor of the optocoupler.

[0056] Further, the solid-state relay circuit further includes a filter circuit (not labeled), and the filter circuit is used for filtering the power supply.

[0057] In this embodiment, the filter circuit includes a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4; where

[0058] The cathode of the first diode D1 is connected to the power supply, the anode of the first diode D1 is connected to the cathode of the second diode D2, and the anode of the second diode D2 is grounded. The cathode of the second diode D2 is also connected to the positive electrode of the motor;

[0059] The cathode of the third diode D3 is connected to the power supply, the anode of the third diode D3 is connected to the cathode of the fourth diode D4, and the anode of the fourth diode D4 is grounded; the cathode of the fourth diode D4 is also connected to the negative pole of the motor.

[0060] The first diode D1 to the fourth diode D4 are high-power ordinary diodes. By connecting them in series in pairs and connecting the DC motor power line to the positive and negative poles of the battery, using the principle that the battery is equivalent to a large capacitor, the power disturbance on the DC motor power line is filtered, thereby suppressing the interference to the power line during the operation of the DC motor, solving the problem that due to the existence of deep-sea pressure, it is impossible to configure a large-capacitance capacitor for power supply filtering, and at the same time protecting the conducting N-MOS transistor from the overvoltage impact generated during the operation of the DC motor.

[0061] To achieve the above object, the present invention also proposes an electronic device, and the electronic device includes the solid-state relay circuit as described above. The specific structure of the solid-state relay circuit refers to the above embodiment. The electronic device includes the beneficial effects that the solid-state relay circuit can achieve.

[0062] It should be understood that the above is only for illustration and does not constitute any limitation to the technical solution of the present invention. In specific applications, those skilled in the art can set according to needs, and the present invention does not limit this.

[0063] It should be noted that the above-described work process is only illustrative and does not constitute a limitation to the protection scope of the present invention. In actual applications, those skilled in the art can select some or all of them according to actual needs to achieve the purpose of the embodiment solution, and there is no limitation here.

[0064] In addition, it should be noted that in this article, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. Without more limitations, the element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or system including that element.

[0065] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0066] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be similarly included in the patent protection scope of the present invention.

Claims

1. A solid-state relay circuit, characterized in that, the solid-state relay circuit includes a first isolation switch circuit, a second isolation switch circuit and a power control circuit; wherein the power control circuit is used to conduct when receiving an opening signal, so that the driving power supply is connected to the ground wire through the first isolation switch circuit and the second isolation switch circuit; the first isolation switch circuit and the second isolation switch circuit are used to turn on when the power control circuit conducts, so that the motor is powered on and works; the first isolation switch circuit includes a first opto-isolated gate driver, a second opto-isolated gate driver, a first power transistor and a second power transistor; the second isolation switch circuit includes a third opto-isolated gate driver, a fourth opto-isolated gate driver, a third power transistor, and a fourth power transistor; wherein the driving output terminal of the third opto-isolated gate driver is connected to the driving input terminal of the fourth opto-isolated gate driver, and the driving output terminal of the fourth opto-isolated gate driver is connected to the power control circuit; the first control terminal of the third opto-isolated gate driver is respectively connected to the source electrodes of the third power transistor and the fourth power transistor, the second control terminal of the third opto-isolated gate driver is connected to the first control terminal of the fourth opto-isolated gate driver, and the second control terminal of the fourth opto-isolated gate driver is respectively connected to the gate electrodes of the third power transistor and the fourth power transistor; the source electrode of the third power transistor is connected to the source electrode of the second power transistor, and the drain electrode of the fourth power transistor is grounded; the solid-state relay circuit further includes a transient suppression diode, the anode of the transient suppression diode is connected to the drain electrode of the third power transistor, and the cathode of the transient suppression diode is connected to the drain electrode of the second power transistor; the solid-state relay circuit includes a first capacitor, the first end of the first capacitor is connected to the first control terminal of the third opto-isolated gate driver, and the second end of the first capacitor is connected to the second control terminal of the fourth opto-isolated gate driver.

2. The solid-state relay circuit according to claim 1, characterized in that, the driving input terminal of the first opto-isolated gate driver is connected to the driving power supply, the driving output terminal of the first opto-isolated gate driver is connected to the driving input terminal of the second opto-isolated gate driver, and the driving output terminal of the second opto-isolated gate driver is connected to the second isolation switch circuit; the first control terminal of the first opto-isolated gate driver is respectively connected to the source electrodes of the first power transistor and the second power transistor, the second control terminal of the first opto-isolated gate driver is connected to the first control terminal of the second opto-isolated gate driver, and the second control terminal of the second opto-isolated gate driver is respectively connected to the gate electrodes of the first power transistor and the second power transistor; the drain electrode of the first power transistor is connected to the power supply, and the drain electrode of the second power transistor is connected to the second isolation switch circuit.

3. The solid-state relay circuit according to claim 2, characterized in that, The solid-state relay circuit further includes a fuse, a first end of the fuse is connected to the power supply, and a second end of the fuse is connected to a drain of the first power transistor.

4. The solid-state relay circuit according to claim 1, wherein, the power control circuit includes a first resistor, a second resistor, a microcontroller, and a fifth power transistor; wherein a gate of the fifth power transistor is connected to the microcontroller, a drain of the fifth power transistor is connected to the second isolation switch circuit via the first resistor; a first end of the second resistor is connected to the gate of the fifth power transistor, a second end of the second resistor is connected to a source of the fifth power transistor; the source of the fifth power transistor is grounded.

5. The solid-state relay circuit according to claim 1, wherein, the solid-state relay circuit further includes a filter circuit for filtering the power supply.

6. The solid-state relay circuit according to claim 5, wherein, the filter circuit includes a first diode, a second diode, a third diode, and a fourth diode; wherein a cathode of the first diode is connected to the power supply, an anode of the first diode is connected to a cathode of the second diode, and an anode of the second diode is grounded; the cathode of the second diode is further connected to a positive electrode of the motor; a cathode of the third diode is connected to the power supply, an anode of the third diode is connected to a cathode of the fourth diode, and an anode of the fourth diode is grounded; the cathode of the fourth diode is further connected to a negative electrode of the motor.

7. An electronic device, wherein, the electronic device includes the solid-state relay circuit according to any one of claims 1 to 6.

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